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![Shyam Prasad N](/assets/img/avatar_default.png)
We had a couple of checks for session in cifs_tree_connect and cifs_mark_open_files_invalid, which were unnecessary. And that was done with ses_lock. Changed that to tc_lock too. Signed-off-by: Shyam Prasad N <sprasad@microsoft.com> Reviewed-by: Paulo Alcantara (SUSE) <pc@manguebit.com> Signed-off-by: Steve French <stfrench@microsoft.com>
5084 lines
130 KiB
C
5084 lines
130 KiB
C
// SPDX-License-Identifier: LGPL-2.1
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/*
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*
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* vfs operations that deal with files
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*
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* Copyright (C) International Business Machines Corp., 2002,2010
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* Author(s): Steve French (sfrench@us.ibm.com)
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* Jeremy Allison (jra@samba.org)
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*
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*/
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#include <linux/fs.h>
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#include <linux/filelock.h>
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#include <linux/backing-dev.h>
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#include <linux/stat.h>
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#include <linux/fcntl.h>
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#include <linux/pagemap.h>
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#include <linux/pagevec.h>
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#include <linux/writeback.h>
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#include <linux/task_io_accounting_ops.h>
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#include <linux/delay.h>
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#include <linux/mount.h>
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#include <linux/slab.h>
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#include <linux/swap.h>
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#include <linux/mm.h>
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#include <asm/div64.h>
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#include "cifsfs.h"
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "smb2proto.h"
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#include "cifs_unicode.h"
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#include "cifs_debug.h"
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#include "cifs_fs_sb.h"
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#include "fscache.h"
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#include "smbdirect.h"
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#include "fs_context.h"
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#include "cifs_ioctl.h"
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#include "cached_dir.h"
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/*
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* Remove the dirty flags from a span of pages.
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*/
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static void cifs_undirty_folios(struct inode *inode, loff_t start, unsigned int len)
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{
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struct address_space *mapping = inode->i_mapping;
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struct folio *folio;
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pgoff_t end;
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XA_STATE(xas, &mapping->i_pages, start / PAGE_SIZE);
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rcu_read_lock();
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end = (start + len - 1) / PAGE_SIZE;
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xas_for_each_marked(&xas, folio, end, PAGECACHE_TAG_DIRTY) {
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if (xas_retry(&xas, folio))
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continue;
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xas_pause(&xas);
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rcu_read_unlock();
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folio_lock(folio);
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folio_clear_dirty_for_io(folio);
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folio_unlock(folio);
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rcu_read_lock();
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}
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rcu_read_unlock();
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}
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/*
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* Completion of write to server.
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*/
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void cifs_pages_written_back(struct inode *inode, loff_t start, unsigned int len)
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{
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struct address_space *mapping = inode->i_mapping;
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struct folio *folio;
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pgoff_t end;
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XA_STATE(xas, &mapping->i_pages, start / PAGE_SIZE);
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if (!len)
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return;
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rcu_read_lock();
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end = (start + len - 1) / PAGE_SIZE;
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xas_for_each(&xas, folio, end) {
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if (xas_retry(&xas, folio))
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continue;
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if (!folio_test_writeback(folio)) {
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WARN_ONCE(1, "bad %x @%llx page %lx %lx\n",
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len, start, folio_index(folio), end);
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continue;
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}
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folio_detach_private(folio);
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folio_end_writeback(folio);
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}
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rcu_read_unlock();
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}
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/*
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* Failure of write to server.
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*/
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void cifs_pages_write_failed(struct inode *inode, loff_t start, unsigned int len)
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{
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struct address_space *mapping = inode->i_mapping;
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struct folio *folio;
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pgoff_t end;
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XA_STATE(xas, &mapping->i_pages, start / PAGE_SIZE);
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if (!len)
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return;
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rcu_read_lock();
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end = (start + len - 1) / PAGE_SIZE;
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xas_for_each(&xas, folio, end) {
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if (xas_retry(&xas, folio))
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continue;
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if (!folio_test_writeback(folio)) {
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WARN_ONCE(1, "bad %x @%llx page %lx %lx\n",
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len, start, folio_index(folio), end);
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continue;
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}
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folio_set_error(folio);
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folio_end_writeback(folio);
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}
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rcu_read_unlock();
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}
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/*
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* Redirty pages after a temporary failure.
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*/
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void cifs_pages_write_redirty(struct inode *inode, loff_t start, unsigned int len)
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{
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struct address_space *mapping = inode->i_mapping;
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struct folio *folio;
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pgoff_t end;
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XA_STATE(xas, &mapping->i_pages, start / PAGE_SIZE);
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if (!len)
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return;
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rcu_read_lock();
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end = (start + len - 1) / PAGE_SIZE;
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xas_for_each(&xas, folio, end) {
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if (!folio_test_writeback(folio)) {
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WARN_ONCE(1, "bad %x @%llx page %lx %lx\n",
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len, start, folio_index(folio), end);
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continue;
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}
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filemap_dirty_folio(folio->mapping, folio);
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folio_end_writeback(folio);
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}
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rcu_read_unlock();
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}
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/*
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* Mark as invalid, all open files on tree connections since they
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* were closed when session to server was lost.
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*/
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void
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cifs_mark_open_files_invalid(struct cifs_tcon *tcon)
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{
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struct cifsFileInfo *open_file = NULL;
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struct list_head *tmp;
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struct list_head *tmp1;
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/* only send once per connect */
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spin_lock(&tcon->tc_lock);
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if (tcon->status != TID_NEED_RECON) {
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spin_unlock(&tcon->tc_lock);
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return;
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}
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tcon->status = TID_IN_FILES_INVALIDATE;
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spin_unlock(&tcon->tc_lock);
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/* list all files open on tree connection and mark them invalid */
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spin_lock(&tcon->open_file_lock);
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list_for_each_safe(tmp, tmp1, &tcon->openFileList) {
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open_file = list_entry(tmp, struct cifsFileInfo, tlist);
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open_file->invalidHandle = true;
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open_file->oplock_break_cancelled = true;
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}
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spin_unlock(&tcon->open_file_lock);
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invalidate_all_cached_dirs(tcon);
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spin_lock(&tcon->tc_lock);
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if (tcon->status == TID_IN_FILES_INVALIDATE)
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tcon->status = TID_NEED_TCON;
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spin_unlock(&tcon->tc_lock);
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/*
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* BB Add call to invalidate_inodes(sb) for all superblocks mounted
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* to this tcon.
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*/
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}
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static inline int cifs_convert_flags(unsigned int flags)
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{
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if ((flags & O_ACCMODE) == O_RDONLY)
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return GENERIC_READ;
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else if ((flags & O_ACCMODE) == O_WRONLY)
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return GENERIC_WRITE;
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else if ((flags & O_ACCMODE) == O_RDWR) {
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/* GENERIC_ALL is too much permission to request
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can cause unnecessary access denied on create */
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/* return GENERIC_ALL; */
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return (GENERIC_READ | GENERIC_WRITE);
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}
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return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES |
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FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA |
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FILE_READ_DATA);
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}
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#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
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static u32 cifs_posix_convert_flags(unsigned int flags)
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{
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u32 posix_flags = 0;
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if ((flags & O_ACCMODE) == O_RDONLY)
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posix_flags = SMB_O_RDONLY;
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else if ((flags & O_ACCMODE) == O_WRONLY)
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posix_flags = SMB_O_WRONLY;
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else if ((flags & O_ACCMODE) == O_RDWR)
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posix_flags = SMB_O_RDWR;
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if (flags & O_CREAT) {
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posix_flags |= SMB_O_CREAT;
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if (flags & O_EXCL)
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posix_flags |= SMB_O_EXCL;
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} else if (flags & O_EXCL)
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cifs_dbg(FYI, "Application %s pid %d has incorrectly set O_EXCL flag but not O_CREAT on file open. Ignoring O_EXCL\n",
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current->comm, current->tgid);
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if (flags & O_TRUNC)
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posix_flags |= SMB_O_TRUNC;
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/* be safe and imply O_SYNC for O_DSYNC */
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if (flags & O_DSYNC)
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posix_flags |= SMB_O_SYNC;
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if (flags & O_DIRECTORY)
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posix_flags |= SMB_O_DIRECTORY;
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if (flags & O_NOFOLLOW)
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posix_flags |= SMB_O_NOFOLLOW;
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if (flags & O_DIRECT)
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posix_flags |= SMB_O_DIRECT;
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return posix_flags;
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}
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#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
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static inline int cifs_get_disposition(unsigned int flags)
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{
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if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
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return FILE_CREATE;
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else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
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return FILE_OVERWRITE_IF;
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else if ((flags & O_CREAT) == O_CREAT)
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return FILE_OPEN_IF;
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else if ((flags & O_TRUNC) == O_TRUNC)
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return FILE_OVERWRITE;
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else
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return FILE_OPEN;
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}
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#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
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int cifs_posix_open(const char *full_path, struct inode **pinode,
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struct super_block *sb, int mode, unsigned int f_flags,
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__u32 *poplock, __u16 *pnetfid, unsigned int xid)
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{
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int rc;
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FILE_UNIX_BASIC_INFO *presp_data;
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__u32 posix_flags = 0;
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struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
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struct cifs_fattr fattr;
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struct tcon_link *tlink;
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struct cifs_tcon *tcon;
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cifs_dbg(FYI, "posix open %s\n", full_path);
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presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
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if (presp_data == NULL)
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return -ENOMEM;
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tlink = cifs_sb_tlink(cifs_sb);
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if (IS_ERR(tlink)) {
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rc = PTR_ERR(tlink);
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goto posix_open_ret;
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}
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tcon = tlink_tcon(tlink);
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mode &= ~current_umask();
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posix_flags = cifs_posix_convert_flags(f_flags);
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rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data,
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poplock, full_path, cifs_sb->local_nls,
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cifs_remap(cifs_sb));
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cifs_put_tlink(tlink);
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if (rc)
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goto posix_open_ret;
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if (presp_data->Type == cpu_to_le32(-1))
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goto posix_open_ret; /* open ok, caller does qpathinfo */
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if (!pinode)
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goto posix_open_ret; /* caller does not need info */
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cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb);
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/* get new inode and set it up */
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if (*pinode == NULL) {
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cifs_fill_uniqueid(sb, &fattr);
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*pinode = cifs_iget(sb, &fattr);
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if (!*pinode) {
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rc = -ENOMEM;
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goto posix_open_ret;
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}
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} else {
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cifs_revalidate_mapping(*pinode);
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rc = cifs_fattr_to_inode(*pinode, &fattr);
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}
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posix_open_ret:
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kfree(presp_data);
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return rc;
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}
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#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
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static int cifs_nt_open(const char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb,
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struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock,
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struct cifs_fid *fid, unsigned int xid, struct cifs_open_info_data *buf)
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{
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int rc;
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int desired_access;
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int disposition;
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int create_options = CREATE_NOT_DIR;
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struct TCP_Server_Info *server = tcon->ses->server;
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struct cifs_open_parms oparms;
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if (!server->ops->open)
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return -ENOSYS;
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desired_access = cifs_convert_flags(f_flags);
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/*********************************************************************
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* open flag mapping table:
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*
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* POSIX Flag CIFS Disposition
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* ---------- ----------------
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* O_CREAT FILE_OPEN_IF
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* O_CREAT | O_EXCL FILE_CREATE
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* O_CREAT | O_TRUNC FILE_OVERWRITE_IF
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* O_TRUNC FILE_OVERWRITE
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* none of the above FILE_OPEN
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*
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* Note that there is not a direct match between disposition
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* FILE_SUPERSEDE (ie create whether or not file exists although
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* O_CREAT | O_TRUNC is similar but truncates the existing
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* file rather than creating a new file as FILE_SUPERSEDE does
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* (which uses the attributes / metadata passed in on open call)
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*?
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*? O_SYNC is a reasonable match to CIFS writethrough flag
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*? and the read write flags match reasonably. O_LARGEFILE
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*? is irrelevant because largefile support is always used
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*? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY,
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* O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation
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*********************************************************************/
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disposition = cifs_get_disposition(f_flags);
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/* BB pass O_SYNC flag through on file attributes .. BB */
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/* O_SYNC also has bit for O_DSYNC so following check picks up either */
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if (f_flags & O_SYNC)
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create_options |= CREATE_WRITE_THROUGH;
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if (f_flags & O_DIRECT)
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create_options |= CREATE_NO_BUFFER;
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oparms = (struct cifs_open_parms) {
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.tcon = tcon,
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.cifs_sb = cifs_sb,
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.desired_access = desired_access,
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.create_options = cifs_create_options(cifs_sb, create_options),
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.disposition = disposition,
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.path = full_path,
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.fid = fid,
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};
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rc = server->ops->open(xid, &oparms, oplock, buf);
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if (rc)
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return rc;
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/* TODO: Add support for calling posix query info but with passing in fid */
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if (tcon->unix_ext)
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rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb,
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xid);
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else
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rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb,
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xid, fid);
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if (rc) {
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server->ops->close(xid, tcon, fid);
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if (rc == -ESTALE)
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rc = -EOPENSTALE;
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}
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|
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return rc;
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}
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static bool
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cifs_has_mand_locks(struct cifsInodeInfo *cinode)
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{
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struct cifs_fid_locks *cur;
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bool has_locks = false;
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|
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down_read(&cinode->lock_sem);
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list_for_each_entry(cur, &cinode->llist, llist) {
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if (!list_empty(&cur->locks)) {
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has_locks = true;
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break;
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}
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}
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up_read(&cinode->lock_sem);
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return has_locks;
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}
|
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|
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void
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cifs_down_write(struct rw_semaphore *sem)
|
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{
|
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while (!down_write_trylock(sem))
|
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msleep(10);
|
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}
|
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|
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static void cifsFileInfo_put_work(struct work_struct *work);
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|
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struct cifsFileInfo *cifs_new_fileinfo(struct cifs_fid *fid, struct file *file,
|
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struct tcon_link *tlink, __u32 oplock,
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const char *symlink_target)
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{
|
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struct dentry *dentry = file_dentry(file);
|
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struct inode *inode = d_inode(dentry);
|
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struct cifsInodeInfo *cinode = CIFS_I(inode);
|
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struct cifsFileInfo *cfile;
|
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struct cifs_fid_locks *fdlocks;
|
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struct cifs_tcon *tcon = tlink_tcon(tlink);
|
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struct TCP_Server_Info *server = tcon->ses->server;
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|
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cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
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if (cfile == NULL)
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return cfile;
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|
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fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL);
|
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if (!fdlocks) {
|
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kfree(cfile);
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return NULL;
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}
|
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|
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if (symlink_target) {
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cfile->symlink_target = kstrdup(symlink_target, GFP_KERNEL);
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if (!cfile->symlink_target) {
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kfree(fdlocks);
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kfree(cfile);
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return NULL;
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}
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}
|
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|
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INIT_LIST_HEAD(&fdlocks->locks);
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fdlocks->cfile = cfile;
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cfile->llist = fdlocks;
|
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|
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cfile->count = 1;
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cfile->pid = current->tgid;
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cfile->uid = current_fsuid();
|
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cfile->dentry = dget(dentry);
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cfile->f_flags = file->f_flags;
|
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cfile->invalidHandle = false;
|
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cfile->deferred_close_scheduled = false;
|
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cfile->tlink = cifs_get_tlink(tlink);
|
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INIT_WORK(&cfile->oplock_break, cifs_oplock_break);
|
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INIT_WORK(&cfile->put, cifsFileInfo_put_work);
|
|
INIT_DELAYED_WORK(&cfile->deferred, smb2_deferred_work_close);
|
|
mutex_init(&cfile->fh_mutex);
|
|
spin_lock_init(&cfile->file_info_lock);
|
|
|
|
cifs_sb_active(inode->i_sb);
|
|
|
|
/*
|
|
* If the server returned a read oplock and we have mandatory brlocks,
|
|
* set oplock level to None.
|
|
*/
|
|
if (server->ops->is_read_op(oplock) && cifs_has_mand_locks(cinode)) {
|
|
cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n");
|
|
oplock = 0;
|
|
}
|
|
|
|
cifs_down_write(&cinode->lock_sem);
|
|
list_add(&fdlocks->llist, &cinode->llist);
|
|
up_write(&cinode->lock_sem);
|
|
|
|
spin_lock(&tcon->open_file_lock);
|
|
if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE && oplock)
|
|
oplock = fid->pending_open->oplock;
|
|
list_del(&fid->pending_open->olist);
|
|
|
|
fid->purge_cache = false;
|
|
server->ops->set_fid(cfile, fid, oplock);
|
|
|
|
list_add(&cfile->tlist, &tcon->openFileList);
|
|
atomic_inc(&tcon->num_local_opens);
|
|
|
|
/* if readable file instance put first in list*/
|
|
spin_lock(&cinode->open_file_lock);
|
|
if (file->f_mode & FMODE_READ)
|
|
list_add(&cfile->flist, &cinode->openFileList);
|
|
else
|
|
list_add_tail(&cfile->flist, &cinode->openFileList);
|
|
spin_unlock(&cinode->open_file_lock);
|
|
spin_unlock(&tcon->open_file_lock);
|
|
|
|
if (fid->purge_cache)
|
|
cifs_zap_mapping(inode);
|
|
|
|
file->private_data = cfile;
|
|
return cfile;
|
|
}
|
|
|
|
struct cifsFileInfo *
|
|
cifsFileInfo_get(struct cifsFileInfo *cifs_file)
|
|
{
|
|
spin_lock(&cifs_file->file_info_lock);
|
|
cifsFileInfo_get_locked(cifs_file);
|
|
spin_unlock(&cifs_file->file_info_lock);
|
|
return cifs_file;
|
|
}
|
|
|
|
static void cifsFileInfo_put_final(struct cifsFileInfo *cifs_file)
|
|
{
|
|
struct inode *inode = d_inode(cifs_file->dentry);
|
|
struct cifsInodeInfo *cifsi = CIFS_I(inode);
|
|
struct cifsLockInfo *li, *tmp;
|
|
struct super_block *sb = inode->i_sb;
|
|
|
|
/*
|
|
* Delete any outstanding lock records. We'll lose them when the file
|
|
* is closed anyway.
|
|
*/
|
|
cifs_down_write(&cifsi->lock_sem);
|
|
list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) {
|
|
list_del(&li->llist);
|
|
cifs_del_lock_waiters(li);
|
|
kfree(li);
|
|
}
|
|
list_del(&cifs_file->llist->llist);
|
|
kfree(cifs_file->llist);
|
|
up_write(&cifsi->lock_sem);
|
|
|
|
cifs_put_tlink(cifs_file->tlink);
|
|
dput(cifs_file->dentry);
|
|
cifs_sb_deactive(sb);
|
|
kfree(cifs_file->symlink_target);
|
|
kfree(cifs_file);
|
|
}
|
|
|
|
static void cifsFileInfo_put_work(struct work_struct *work)
|
|
{
|
|
struct cifsFileInfo *cifs_file = container_of(work,
|
|
struct cifsFileInfo, put);
|
|
|
|
cifsFileInfo_put_final(cifs_file);
|
|
}
|
|
|
|
/**
|
|
* cifsFileInfo_put - release a reference of file priv data
|
|
*
|
|
* Always potentially wait for oplock handler. See _cifsFileInfo_put().
|
|
*
|
|
* @cifs_file: cifs/smb3 specific info (eg refcounts) for an open file
|
|
*/
|
|
void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
|
|
{
|
|
_cifsFileInfo_put(cifs_file, true, true);
|
|
}
|
|
|
|
/**
|
|
* _cifsFileInfo_put - release a reference of file priv data
|
|
*
|
|
* This may involve closing the filehandle @cifs_file out on the
|
|
* server. Must be called without holding tcon->open_file_lock,
|
|
* cinode->open_file_lock and cifs_file->file_info_lock.
|
|
*
|
|
* If @wait_for_oplock_handler is true and we are releasing the last
|
|
* reference, wait for any running oplock break handler of the file
|
|
* and cancel any pending one.
|
|
*
|
|
* @cifs_file: cifs/smb3 specific info (eg refcounts) for an open file
|
|
* @wait_oplock_handler: must be false if called from oplock_break_handler
|
|
* @offload: not offloaded on close and oplock breaks
|
|
*
|
|
*/
|
|
void _cifsFileInfo_put(struct cifsFileInfo *cifs_file,
|
|
bool wait_oplock_handler, bool offload)
|
|
{
|
|
struct inode *inode = d_inode(cifs_file->dentry);
|
|
struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink);
|
|
struct TCP_Server_Info *server = tcon->ses->server;
|
|
struct cifsInodeInfo *cifsi = CIFS_I(inode);
|
|
struct super_block *sb = inode->i_sb;
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
|
|
struct cifs_fid fid = {};
|
|
struct cifs_pending_open open;
|
|
bool oplock_break_cancelled;
|
|
|
|
spin_lock(&tcon->open_file_lock);
|
|
spin_lock(&cifsi->open_file_lock);
|
|
spin_lock(&cifs_file->file_info_lock);
|
|
if (--cifs_file->count > 0) {
|
|
spin_unlock(&cifs_file->file_info_lock);
|
|
spin_unlock(&cifsi->open_file_lock);
|
|
spin_unlock(&tcon->open_file_lock);
|
|
return;
|
|
}
|
|
spin_unlock(&cifs_file->file_info_lock);
|
|
|
|
if (server->ops->get_lease_key)
|
|
server->ops->get_lease_key(inode, &fid);
|
|
|
|
/* store open in pending opens to make sure we don't miss lease break */
|
|
cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open);
|
|
|
|
/* remove it from the lists */
|
|
list_del(&cifs_file->flist);
|
|
list_del(&cifs_file->tlist);
|
|
atomic_dec(&tcon->num_local_opens);
|
|
|
|
if (list_empty(&cifsi->openFileList)) {
|
|
cifs_dbg(FYI, "closing last open instance for inode %p\n",
|
|
d_inode(cifs_file->dentry));
|
|
/*
|
|
* In strict cache mode we need invalidate mapping on the last
|
|
* close because it may cause a error when we open this file
|
|
* again and get at least level II oplock.
|
|
*/
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
|
|
set_bit(CIFS_INO_INVALID_MAPPING, &cifsi->flags);
|
|
cifs_set_oplock_level(cifsi, 0);
|
|
}
|
|
|
|
spin_unlock(&cifsi->open_file_lock);
|
|
spin_unlock(&tcon->open_file_lock);
|
|
|
|
oplock_break_cancelled = wait_oplock_handler ?
|
|
cancel_work_sync(&cifs_file->oplock_break) : false;
|
|
|
|
if (!tcon->need_reconnect && !cifs_file->invalidHandle) {
|
|
struct TCP_Server_Info *server = tcon->ses->server;
|
|
unsigned int xid;
|
|
|
|
xid = get_xid();
|
|
if (server->ops->close_getattr)
|
|
server->ops->close_getattr(xid, tcon, cifs_file);
|
|
else if (server->ops->close)
|
|
server->ops->close(xid, tcon, &cifs_file->fid);
|
|
_free_xid(xid);
|
|
}
|
|
|
|
if (oplock_break_cancelled)
|
|
cifs_done_oplock_break(cifsi);
|
|
|
|
cifs_del_pending_open(&open);
|
|
|
|
if (offload)
|
|
queue_work(fileinfo_put_wq, &cifs_file->put);
|
|
else
|
|
cifsFileInfo_put_final(cifs_file);
|
|
}
|
|
|
|
int cifs_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
int rc = -EACCES;
|
|
unsigned int xid;
|
|
__u32 oplock;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct TCP_Server_Info *server;
|
|
struct cifs_tcon *tcon;
|
|
struct tcon_link *tlink;
|
|
struct cifsFileInfo *cfile = NULL;
|
|
void *page;
|
|
const char *full_path;
|
|
bool posix_open_ok = false;
|
|
struct cifs_fid fid = {};
|
|
struct cifs_pending_open open;
|
|
struct cifs_open_info_data data = {};
|
|
|
|
xid = get_xid();
|
|
|
|
cifs_sb = CIFS_SB(inode->i_sb);
|
|
if (unlikely(cifs_forced_shutdown(cifs_sb))) {
|
|
free_xid(xid);
|
|
return -EIO;
|
|
}
|
|
|
|
tlink = cifs_sb_tlink(cifs_sb);
|
|
if (IS_ERR(tlink)) {
|
|
free_xid(xid);
|
|
return PTR_ERR(tlink);
|
|
}
|
|
tcon = tlink_tcon(tlink);
|
|
server = tcon->ses->server;
|
|
|
|
page = alloc_dentry_path();
|
|
full_path = build_path_from_dentry(file_dentry(file), page);
|
|
if (IS_ERR(full_path)) {
|
|
rc = PTR_ERR(full_path);
|
|
goto out;
|
|
}
|
|
|
|
cifs_dbg(FYI, "inode = 0x%p file flags are 0x%x for %s\n",
|
|
inode, file->f_flags, full_path);
|
|
|
|
if (file->f_flags & O_DIRECT &&
|
|
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
|
|
file->f_op = &cifs_file_direct_nobrl_ops;
|
|
else
|
|
file->f_op = &cifs_file_direct_ops;
|
|
}
|
|
|
|
/* Get the cached handle as SMB2 close is deferred */
|
|
rc = cifs_get_readable_path(tcon, full_path, &cfile);
|
|
if (rc == 0) {
|
|
if (file->f_flags == cfile->f_flags) {
|
|
file->private_data = cfile;
|
|
spin_lock(&CIFS_I(inode)->deferred_lock);
|
|
cifs_del_deferred_close(cfile);
|
|
spin_unlock(&CIFS_I(inode)->deferred_lock);
|
|
goto use_cache;
|
|
} else {
|
|
_cifsFileInfo_put(cfile, true, false);
|
|
}
|
|
}
|
|
|
|
if (server->oplocks)
|
|
oplock = REQ_OPLOCK;
|
|
else
|
|
oplock = 0;
|
|
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
if (!tcon->broken_posix_open && tcon->unix_ext &&
|
|
cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
|
|
le64_to_cpu(tcon->fsUnixInfo.Capability))) {
|
|
/* can not refresh inode info since size could be stale */
|
|
rc = cifs_posix_open(full_path, &inode, inode->i_sb,
|
|
cifs_sb->ctx->file_mode /* ignored */,
|
|
file->f_flags, &oplock, &fid.netfid, xid);
|
|
if (rc == 0) {
|
|
cifs_dbg(FYI, "posix open succeeded\n");
|
|
posix_open_ok = true;
|
|
} else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
|
|
if (tcon->ses->serverNOS)
|
|
cifs_dbg(VFS, "server %s of type %s returned unexpected error on SMB posix open, disabling posix open support. Check if server update available.\n",
|
|
tcon->ses->ip_addr,
|
|
tcon->ses->serverNOS);
|
|
tcon->broken_posix_open = true;
|
|
} else if ((rc != -EIO) && (rc != -EREMOTE) &&
|
|
(rc != -EOPNOTSUPP)) /* path not found or net err */
|
|
goto out;
|
|
/*
|
|
* Else fallthrough to retry open the old way on network i/o
|
|
* or DFS errors.
|
|
*/
|
|
}
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|
|
|
|
if (server->ops->get_lease_key)
|
|
server->ops->get_lease_key(inode, &fid);
|
|
|
|
cifs_add_pending_open(&fid, tlink, &open);
|
|
|
|
if (!posix_open_ok) {
|
|
if (server->ops->get_lease_key)
|
|
server->ops->get_lease_key(inode, &fid);
|
|
|
|
rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, file->f_flags, &oplock, &fid,
|
|
xid, &data);
|
|
if (rc) {
|
|
cifs_del_pending_open(&open);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
cfile = cifs_new_fileinfo(&fid, file, tlink, oplock, data.symlink_target);
|
|
if (cfile == NULL) {
|
|
if (server->ops->close)
|
|
server->ops->close(xid, tcon, &fid);
|
|
cifs_del_pending_open(&open);
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) {
|
|
/*
|
|
* Time to set mode which we can not set earlier due to
|
|
* problems creating new read-only files.
|
|
*/
|
|
struct cifs_unix_set_info_args args = {
|
|
.mode = inode->i_mode,
|
|
.uid = INVALID_UID, /* no change */
|
|
.gid = INVALID_GID, /* no change */
|
|
.ctime = NO_CHANGE_64,
|
|
.atime = NO_CHANGE_64,
|
|
.mtime = NO_CHANGE_64,
|
|
.device = 0,
|
|
};
|
|
CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid,
|
|
cfile->pid);
|
|
}
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|
|
|
|
use_cache:
|
|
fscache_use_cookie(cifs_inode_cookie(file_inode(file)),
|
|
file->f_mode & FMODE_WRITE);
|
|
if (file->f_flags & O_DIRECT &&
|
|
(!((file->f_flags & O_ACCMODE) != O_RDONLY) ||
|
|
file->f_flags & O_APPEND))
|
|
cifs_invalidate_cache(file_inode(file),
|
|
FSCACHE_INVAL_DIO_WRITE);
|
|
|
|
out:
|
|
free_dentry_path(page);
|
|
free_xid(xid);
|
|
cifs_put_tlink(tlink);
|
|
cifs_free_open_info(&data);
|
|
return rc;
|
|
}
|
|
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
static int cifs_push_posix_locks(struct cifsFileInfo *cfile);
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|
|
|
|
/*
|
|
* Try to reacquire byte range locks that were released when session
|
|
* to server was lost.
|
|
*/
|
|
static int
|
|
cifs_relock_file(struct cifsFileInfo *cfile)
|
|
{
|
|
struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
|
|
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
|
|
int rc = 0;
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|
|
|
|
down_read_nested(&cinode->lock_sem, SINGLE_DEPTH_NESTING);
|
|
if (cinode->can_cache_brlcks) {
|
|
/* can cache locks - no need to relock */
|
|
up_read(&cinode->lock_sem);
|
|
return rc;
|
|
}
|
|
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
if (cap_unix(tcon->ses) &&
|
|
(CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
|
|
((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
|
|
rc = cifs_push_posix_locks(cfile);
|
|
else
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|
|
rc = tcon->ses->server->ops->push_mand_locks(cfile);
|
|
|
|
up_read(&cinode->lock_sem);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
|
|
{
|
|
int rc = -EACCES;
|
|
unsigned int xid;
|
|
__u32 oplock;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifs_tcon *tcon;
|
|
struct TCP_Server_Info *server;
|
|
struct cifsInodeInfo *cinode;
|
|
struct inode *inode;
|
|
void *page;
|
|
const char *full_path;
|
|
int desired_access;
|
|
int disposition = FILE_OPEN;
|
|
int create_options = CREATE_NOT_DIR;
|
|
struct cifs_open_parms oparms;
|
|
|
|
xid = get_xid();
|
|
mutex_lock(&cfile->fh_mutex);
|
|
if (!cfile->invalidHandle) {
|
|
mutex_unlock(&cfile->fh_mutex);
|
|
free_xid(xid);
|
|
return 0;
|
|
}
|
|
|
|
inode = d_inode(cfile->dentry);
|
|
cifs_sb = CIFS_SB(inode->i_sb);
|
|
tcon = tlink_tcon(cfile->tlink);
|
|
server = tcon->ses->server;
|
|
|
|
/*
|
|
* Can not grab rename sem here because various ops, including those
|
|
* that already have the rename sem can end up causing writepage to get
|
|
* called and if the server was down that means we end up here, and we
|
|
* can never tell if the caller already has the rename_sem.
|
|
*/
|
|
page = alloc_dentry_path();
|
|
full_path = build_path_from_dentry(cfile->dentry, page);
|
|
if (IS_ERR(full_path)) {
|
|
mutex_unlock(&cfile->fh_mutex);
|
|
free_dentry_path(page);
|
|
free_xid(xid);
|
|
return PTR_ERR(full_path);
|
|
}
|
|
|
|
cifs_dbg(FYI, "inode = 0x%p file flags 0x%x for %s\n",
|
|
inode, cfile->f_flags, full_path);
|
|
|
|
if (tcon->ses->server->oplocks)
|
|
oplock = REQ_OPLOCK;
|
|
else
|
|
oplock = 0;
|
|
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
if (tcon->unix_ext && cap_unix(tcon->ses) &&
|
|
(CIFS_UNIX_POSIX_PATH_OPS_CAP &
|
|
le64_to_cpu(tcon->fsUnixInfo.Capability))) {
|
|
/*
|
|
* O_CREAT, O_EXCL and O_TRUNC already had their effect on the
|
|
* original open. Must mask them off for a reopen.
|
|
*/
|
|
unsigned int oflags = cfile->f_flags &
|
|
~(O_CREAT | O_EXCL | O_TRUNC);
|
|
|
|
rc = cifs_posix_open(full_path, NULL, inode->i_sb,
|
|
cifs_sb->ctx->file_mode /* ignored */,
|
|
oflags, &oplock, &cfile->fid.netfid, xid);
|
|
if (rc == 0) {
|
|
cifs_dbg(FYI, "posix reopen succeeded\n");
|
|
oparms.reconnect = true;
|
|
goto reopen_success;
|
|
}
|
|
/*
|
|
* fallthrough to retry open the old way on errors, especially
|
|
* in the reconnect path it is important to retry hard
|
|
*/
|
|
}
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|
|
|
|
desired_access = cifs_convert_flags(cfile->f_flags);
|
|
|
|
/* O_SYNC also has bit for O_DSYNC so following check picks up either */
|
|
if (cfile->f_flags & O_SYNC)
|
|
create_options |= CREATE_WRITE_THROUGH;
|
|
|
|
if (cfile->f_flags & O_DIRECT)
|
|
create_options |= CREATE_NO_BUFFER;
|
|
|
|
if (server->ops->get_lease_key)
|
|
server->ops->get_lease_key(inode, &cfile->fid);
|
|
|
|
oparms = (struct cifs_open_parms) {
|
|
.tcon = tcon,
|
|
.cifs_sb = cifs_sb,
|
|
.desired_access = desired_access,
|
|
.create_options = cifs_create_options(cifs_sb, create_options),
|
|
.disposition = disposition,
|
|
.path = full_path,
|
|
.fid = &cfile->fid,
|
|
.reconnect = true,
|
|
};
|
|
|
|
/*
|
|
* Can not refresh inode by passing in file_info buf to be returned by
|
|
* ops->open and then calling get_inode_info with returned buf since
|
|
* file might have write behind data that needs to be flushed and server
|
|
* version of file size can be stale. If we knew for sure that inode was
|
|
* not dirty locally we could do this.
|
|
*/
|
|
rc = server->ops->open(xid, &oparms, &oplock, NULL);
|
|
if (rc == -ENOENT && oparms.reconnect == false) {
|
|
/* durable handle timeout is expired - open the file again */
|
|
rc = server->ops->open(xid, &oparms, &oplock, NULL);
|
|
/* indicate that we need to relock the file */
|
|
oparms.reconnect = true;
|
|
}
|
|
|
|
if (rc) {
|
|
mutex_unlock(&cfile->fh_mutex);
|
|
cifs_dbg(FYI, "cifs_reopen returned 0x%x\n", rc);
|
|
cifs_dbg(FYI, "oplock: %d\n", oplock);
|
|
goto reopen_error_exit;
|
|
}
|
|
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
reopen_success:
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|
|
cfile->invalidHandle = false;
|
|
mutex_unlock(&cfile->fh_mutex);
|
|
cinode = CIFS_I(inode);
|
|
|
|
if (can_flush) {
|
|
rc = filemap_write_and_wait(inode->i_mapping);
|
|
if (!is_interrupt_error(rc))
|
|
mapping_set_error(inode->i_mapping, rc);
|
|
|
|
if (tcon->posix_extensions)
|
|
rc = smb311_posix_get_inode_info(&inode, full_path, inode->i_sb, xid);
|
|
else if (tcon->unix_ext)
|
|
rc = cifs_get_inode_info_unix(&inode, full_path,
|
|
inode->i_sb, xid);
|
|
else
|
|
rc = cifs_get_inode_info(&inode, full_path, NULL,
|
|
inode->i_sb, xid, NULL);
|
|
}
|
|
/*
|
|
* Else we are writing out data to server already and could deadlock if
|
|
* we tried to flush data, and since we do not know if we have data that
|
|
* would invalidate the current end of file on the server we can not go
|
|
* to the server to get the new inode info.
|
|
*/
|
|
|
|
/*
|
|
* If the server returned a read oplock and we have mandatory brlocks,
|
|
* set oplock level to None.
|
|
*/
|
|
if (server->ops->is_read_op(oplock) && cifs_has_mand_locks(cinode)) {
|
|
cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n");
|
|
oplock = 0;
|
|
}
|
|
|
|
server->ops->set_fid(cfile, &cfile->fid, oplock);
|
|
if (oparms.reconnect)
|
|
cifs_relock_file(cfile);
|
|
|
|
reopen_error_exit:
|
|
free_dentry_path(page);
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
|
|
void smb2_deferred_work_close(struct work_struct *work)
|
|
{
|
|
struct cifsFileInfo *cfile = container_of(work,
|
|
struct cifsFileInfo, deferred.work);
|
|
|
|
spin_lock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock);
|
|
cifs_del_deferred_close(cfile);
|
|
cfile->deferred_close_scheduled = false;
|
|
spin_unlock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock);
|
|
_cifsFileInfo_put(cfile, true, false);
|
|
}
|
|
|
|
int cifs_close(struct inode *inode, struct file *file)
|
|
{
|
|
struct cifsFileInfo *cfile;
|
|
struct cifsInodeInfo *cinode = CIFS_I(inode);
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
|
|
struct cifs_deferred_close *dclose;
|
|
|
|
cifs_fscache_unuse_inode_cookie(inode, file->f_mode & FMODE_WRITE);
|
|
|
|
if (file->private_data != NULL) {
|
|
cfile = file->private_data;
|
|
file->private_data = NULL;
|
|
dclose = kmalloc(sizeof(struct cifs_deferred_close), GFP_KERNEL);
|
|
if ((cinode->oplock == CIFS_CACHE_RHW_FLG) &&
|
|
cinode->lease_granted &&
|
|
!test_bit(CIFS_INO_CLOSE_ON_LOCK, &cinode->flags) &&
|
|
dclose) {
|
|
if (test_and_clear_bit(CIFS_INO_MODIFIED_ATTR, &cinode->flags)) {
|
|
inode->i_ctime = inode->i_mtime = current_time(inode);
|
|
}
|
|
spin_lock(&cinode->deferred_lock);
|
|
cifs_add_deferred_close(cfile, dclose);
|
|
if (cfile->deferred_close_scheduled &&
|
|
delayed_work_pending(&cfile->deferred)) {
|
|
/*
|
|
* If there is no pending work, mod_delayed_work queues new work.
|
|
* So, Increase the ref count to avoid use-after-free.
|
|
*/
|
|
if (!mod_delayed_work(deferredclose_wq,
|
|
&cfile->deferred, cifs_sb->ctx->closetimeo))
|
|
cifsFileInfo_get(cfile);
|
|
} else {
|
|
/* Deferred close for files */
|
|
queue_delayed_work(deferredclose_wq,
|
|
&cfile->deferred, cifs_sb->ctx->closetimeo);
|
|
cfile->deferred_close_scheduled = true;
|
|
spin_unlock(&cinode->deferred_lock);
|
|
return 0;
|
|
}
|
|
spin_unlock(&cinode->deferred_lock);
|
|
_cifsFileInfo_put(cfile, true, false);
|
|
} else {
|
|
_cifsFileInfo_put(cfile, true, false);
|
|
kfree(dclose);
|
|
}
|
|
}
|
|
|
|
/* return code from the ->release op is always ignored */
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
cifs_reopen_persistent_handles(struct cifs_tcon *tcon)
|
|
{
|
|
struct cifsFileInfo *open_file, *tmp;
|
|
struct list_head tmp_list;
|
|
|
|
if (!tcon->use_persistent || !tcon->need_reopen_files)
|
|
return;
|
|
|
|
tcon->need_reopen_files = false;
|
|
|
|
cifs_dbg(FYI, "Reopen persistent handles\n");
|
|
INIT_LIST_HEAD(&tmp_list);
|
|
|
|
/* list all files open on tree connection, reopen resilient handles */
|
|
spin_lock(&tcon->open_file_lock);
|
|
list_for_each_entry(open_file, &tcon->openFileList, tlist) {
|
|
if (!open_file->invalidHandle)
|
|
continue;
|
|
cifsFileInfo_get(open_file);
|
|
list_add_tail(&open_file->rlist, &tmp_list);
|
|
}
|
|
spin_unlock(&tcon->open_file_lock);
|
|
|
|
list_for_each_entry_safe(open_file, tmp, &tmp_list, rlist) {
|
|
if (cifs_reopen_file(open_file, false /* do not flush */))
|
|
tcon->need_reopen_files = true;
|
|
list_del_init(&open_file->rlist);
|
|
cifsFileInfo_put(open_file);
|
|
}
|
|
}
|
|
|
|
int cifs_closedir(struct inode *inode, struct file *file)
|
|
{
|
|
int rc = 0;
|
|
unsigned int xid;
|
|
struct cifsFileInfo *cfile = file->private_data;
|
|
struct cifs_tcon *tcon;
|
|
struct TCP_Server_Info *server;
|
|
char *buf;
|
|
|
|
cifs_dbg(FYI, "Closedir inode = 0x%p\n", inode);
|
|
|
|
if (cfile == NULL)
|
|
return rc;
|
|
|
|
xid = get_xid();
|
|
tcon = tlink_tcon(cfile->tlink);
|
|
server = tcon->ses->server;
|
|
|
|
cifs_dbg(FYI, "Freeing private data in close dir\n");
|
|
spin_lock(&cfile->file_info_lock);
|
|
if (server->ops->dir_needs_close(cfile)) {
|
|
cfile->invalidHandle = true;
|
|
spin_unlock(&cfile->file_info_lock);
|
|
if (server->ops->close_dir)
|
|
rc = server->ops->close_dir(xid, tcon, &cfile->fid);
|
|
else
|
|
rc = -ENOSYS;
|
|
cifs_dbg(FYI, "Closing uncompleted readdir with rc %d\n", rc);
|
|
/* not much we can do if it fails anyway, ignore rc */
|
|
rc = 0;
|
|
} else
|
|
spin_unlock(&cfile->file_info_lock);
|
|
|
|
buf = cfile->srch_inf.ntwrk_buf_start;
|
|
if (buf) {
|
|
cifs_dbg(FYI, "closedir free smb buf in srch struct\n");
|
|
cfile->srch_inf.ntwrk_buf_start = NULL;
|
|
if (cfile->srch_inf.smallBuf)
|
|
cifs_small_buf_release(buf);
|
|
else
|
|
cifs_buf_release(buf);
|
|
}
|
|
|
|
cifs_put_tlink(cfile->tlink);
|
|
kfree(file->private_data);
|
|
file->private_data = NULL;
|
|
/* BB can we lock the filestruct while this is going on? */
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
|
|
static struct cifsLockInfo *
|
|
cifs_lock_init(__u64 offset, __u64 length, __u8 type, __u16 flags)
|
|
{
|
|
struct cifsLockInfo *lock =
|
|
kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL);
|
|
if (!lock)
|
|
return lock;
|
|
lock->offset = offset;
|
|
lock->length = length;
|
|
lock->type = type;
|
|
lock->pid = current->tgid;
|
|
lock->flags = flags;
|
|
INIT_LIST_HEAD(&lock->blist);
|
|
init_waitqueue_head(&lock->block_q);
|
|
return lock;
|
|
}
|
|
|
|
void
|
|
cifs_del_lock_waiters(struct cifsLockInfo *lock)
|
|
{
|
|
struct cifsLockInfo *li, *tmp;
|
|
list_for_each_entry_safe(li, tmp, &lock->blist, blist) {
|
|
list_del_init(&li->blist);
|
|
wake_up(&li->block_q);
|
|
}
|
|
}
|
|
|
|
#define CIFS_LOCK_OP 0
|
|
#define CIFS_READ_OP 1
|
|
#define CIFS_WRITE_OP 2
|
|
|
|
/* @rw_check : 0 - no op, 1 - read, 2 - write */
|
|
static bool
|
|
cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset,
|
|
__u64 length, __u8 type, __u16 flags,
|
|
struct cifsFileInfo *cfile,
|
|
struct cifsLockInfo **conf_lock, int rw_check)
|
|
{
|
|
struct cifsLockInfo *li;
|
|
struct cifsFileInfo *cur_cfile = fdlocks->cfile;
|
|
struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
|
|
|
|
list_for_each_entry(li, &fdlocks->locks, llist) {
|
|
if (offset + length <= li->offset ||
|
|
offset >= li->offset + li->length)
|
|
continue;
|
|
if (rw_check != CIFS_LOCK_OP && current->tgid == li->pid &&
|
|
server->ops->compare_fids(cfile, cur_cfile)) {
|
|
/* shared lock prevents write op through the same fid */
|
|
if (!(li->type & server->vals->shared_lock_type) ||
|
|
rw_check != CIFS_WRITE_OP)
|
|
continue;
|
|
}
|
|
if ((type & server->vals->shared_lock_type) &&
|
|
((server->ops->compare_fids(cfile, cur_cfile) &&
|
|
current->tgid == li->pid) || type == li->type))
|
|
continue;
|
|
if (rw_check == CIFS_LOCK_OP &&
|
|
(flags & FL_OFDLCK) && (li->flags & FL_OFDLCK) &&
|
|
server->ops->compare_fids(cfile, cur_cfile))
|
|
continue;
|
|
if (conf_lock)
|
|
*conf_lock = li;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length,
|
|
__u8 type, __u16 flags,
|
|
struct cifsLockInfo **conf_lock, int rw_check)
|
|
{
|
|
bool rc = false;
|
|
struct cifs_fid_locks *cur;
|
|
struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
|
|
|
|
list_for_each_entry(cur, &cinode->llist, llist) {
|
|
rc = cifs_find_fid_lock_conflict(cur, offset, length, type,
|
|
flags, cfile, conf_lock,
|
|
rw_check);
|
|
if (rc)
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Check if there is another lock that prevents us to set the lock (mandatory
|
|
* style). If such a lock exists, update the flock structure with its
|
|
* properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks
|
|
* or leave it the same if we can't. Returns 0 if we don't need to request to
|
|
* the server or 1 otherwise.
|
|
*/
|
|
static int
|
|
cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length,
|
|
__u8 type, struct file_lock *flock)
|
|
{
|
|
int rc = 0;
|
|
struct cifsLockInfo *conf_lock;
|
|
struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
|
|
struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
|
|
bool exist;
|
|
|
|
down_read(&cinode->lock_sem);
|
|
|
|
exist = cifs_find_lock_conflict(cfile, offset, length, type,
|
|
flock->fl_flags, &conf_lock,
|
|
CIFS_LOCK_OP);
|
|
if (exist) {
|
|
flock->fl_start = conf_lock->offset;
|
|
flock->fl_end = conf_lock->offset + conf_lock->length - 1;
|
|
flock->fl_pid = conf_lock->pid;
|
|
if (conf_lock->type & server->vals->shared_lock_type)
|
|
flock->fl_type = F_RDLCK;
|
|
else
|
|
flock->fl_type = F_WRLCK;
|
|
} else if (!cinode->can_cache_brlcks)
|
|
rc = 1;
|
|
else
|
|
flock->fl_type = F_UNLCK;
|
|
|
|
up_read(&cinode->lock_sem);
|
|
return rc;
|
|
}
|
|
|
|
static void
|
|
cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock)
|
|
{
|
|
struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
|
|
cifs_down_write(&cinode->lock_sem);
|
|
list_add_tail(&lock->llist, &cfile->llist->locks);
|
|
up_write(&cinode->lock_sem);
|
|
}
|
|
|
|
/*
|
|
* Set the byte-range lock (mandatory style). Returns:
|
|
* 1) 0, if we set the lock and don't need to request to the server;
|
|
* 2) 1, if no locks prevent us but we need to request to the server;
|
|
* 3) -EACCES, if there is a lock that prevents us and wait is false.
|
|
*/
|
|
static int
|
|
cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock,
|
|
bool wait)
|
|
{
|
|
struct cifsLockInfo *conf_lock;
|
|
struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
|
|
bool exist;
|
|
int rc = 0;
|
|
|
|
try_again:
|
|
exist = false;
|
|
cifs_down_write(&cinode->lock_sem);
|
|
|
|
exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length,
|
|
lock->type, lock->flags, &conf_lock,
|
|
CIFS_LOCK_OP);
|
|
if (!exist && cinode->can_cache_brlcks) {
|
|
list_add_tail(&lock->llist, &cfile->llist->locks);
|
|
up_write(&cinode->lock_sem);
|
|
return rc;
|
|
}
|
|
|
|
if (!exist)
|
|
rc = 1;
|
|
else if (!wait)
|
|
rc = -EACCES;
|
|
else {
|
|
list_add_tail(&lock->blist, &conf_lock->blist);
|
|
up_write(&cinode->lock_sem);
|
|
rc = wait_event_interruptible(lock->block_q,
|
|
(lock->blist.prev == &lock->blist) &&
|
|
(lock->blist.next == &lock->blist));
|
|
if (!rc)
|
|
goto try_again;
|
|
cifs_down_write(&cinode->lock_sem);
|
|
list_del_init(&lock->blist);
|
|
}
|
|
|
|
up_write(&cinode->lock_sem);
|
|
return rc;
|
|
}
|
|
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
/*
|
|
* Check if there is another lock that prevents us to set the lock (posix
|
|
* style). If such a lock exists, update the flock structure with its
|
|
* properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks
|
|
* or leave it the same if we can't. Returns 0 if we don't need to request to
|
|
* the server or 1 otherwise.
|
|
*/
|
|
static int
|
|
cifs_posix_lock_test(struct file *file, struct file_lock *flock)
|
|
{
|
|
int rc = 0;
|
|
struct cifsInodeInfo *cinode = CIFS_I(file_inode(file));
|
|
unsigned char saved_type = flock->fl_type;
|
|
|
|
if ((flock->fl_flags & FL_POSIX) == 0)
|
|
return 1;
|
|
|
|
down_read(&cinode->lock_sem);
|
|
posix_test_lock(file, flock);
|
|
|
|
if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) {
|
|
flock->fl_type = saved_type;
|
|
rc = 1;
|
|
}
|
|
|
|
up_read(&cinode->lock_sem);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Set the byte-range lock (posix style). Returns:
|
|
* 1) <0, if the error occurs while setting the lock;
|
|
* 2) 0, if we set the lock and don't need to request to the server;
|
|
* 3) FILE_LOCK_DEFERRED, if we will wait for some other file_lock;
|
|
* 4) FILE_LOCK_DEFERRED + 1, if we need to request to the server.
|
|
*/
|
|
static int
|
|
cifs_posix_lock_set(struct file *file, struct file_lock *flock)
|
|
{
|
|
struct cifsInodeInfo *cinode = CIFS_I(file_inode(file));
|
|
int rc = FILE_LOCK_DEFERRED + 1;
|
|
|
|
if ((flock->fl_flags & FL_POSIX) == 0)
|
|
return rc;
|
|
|
|
cifs_down_write(&cinode->lock_sem);
|
|
if (!cinode->can_cache_brlcks) {
|
|
up_write(&cinode->lock_sem);
|
|
return rc;
|
|
}
|
|
|
|
rc = posix_lock_file(file, flock, NULL);
|
|
up_write(&cinode->lock_sem);
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
|
|
{
|
|
unsigned int xid;
|
|
int rc = 0, stored_rc;
|
|
struct cifsLockInfo *li, *tmp;
|
|
struct cifs_tcon *tcon;
|
|
unsigned int num, max_num, max_buf;
|
|
LOCKING_ANDX_RANGE *buf, *cur;
|
|
static const int types[] = {
|
|
LOCKING_ANDX_LARGE_FILES,
|
|
LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES
|
|
};
|
|
int i;
|
|
|
|
xid = get_xid();
|
|
tcon = tlink_tcon(cfile->tlink);
|
|
|
|
/*
|
|
* Accessing maxBuf is racy with cifs_reconnect - need to store value
|
|
* and check it before using.
|
|
*/
|
|
max_buf = tcon->ses->server->maxBuf;
|
|
if (max_buf < (sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE))) {
|
|
free_xid(xid);
|
|
return -EINVAL;
|
|
}
|
|
|
|
BUILD_BUG_ON(sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE) >
|
|
PAGE_SIZE);
|
|
max_buf = min_t(unsigned int, max_buf - sizeof(struct smb_hdr),
|
|
PAGE_SIZE);
|
|
max_num = (max_buf - sizeof(struct smb_hdr)) /
|
|
sizeof(LOCKING_ANDX_RANGE);
|
|
buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);
|
|
if (!buf) {
|
|
free_xid(xid);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
cur = buf;
|
|
num = 0;
|
|
list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
|
|
if (li->type != types[i])
|
|
continue;
|
|
cur->Pid = cpu_to_le16(li->pid);
|
|
cur->LengthLow = cpu_to_le32((u32)li->length);
|
|
cur->LengthHigh = cpu_to_le32((u32)(li->length>>32));
|
|
cur->OffsetLow = cpu_to_le32((u32)li->offset);
|
|
cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32));
|
|
if (++num == max_num) {
|
|
stored_rc = cifs_lockv(xid, tcon,
|
|
cfile->fid.netfid,
|
|
(__u8)li->type, 0, num,
|
|
buf);
|
|
if (stored_rc)
|
|
rc = stored_rc;
|
|
cur = buf;
|
|
num = 0;
|
|
} else
|
|
cur++;
|
|
}
|
|
|
|
if (num) {
|
|
stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid,
|
|
(__u8)types[i], 0, num, buf);
|
|
if (stored_rc)
|
|
rc = stored_rc;
|
|
}
|
|
}
|
|
|
|
kfree(buf);
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
|
|
static __u32
|
|
hash_lockowner(fl_owner_t owner)
|
|
{
|
|
return cifs_lock_secret ^ hash32_ptr((const void *)owner);
|
|
}
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|
|
|
|
struct lock_to_push {
|
|
struct list_head llist;
|
|
__u64 offset;
|
|
__u64 length;
|
|
__u32 pid;
|
|
__u16 netfid;
|
|
__u8 type;
|
|
};
|
|
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
static int
|
|
cifs_push_posix_locks(struct cifsFileInfo *cfile)
|
|
{
|
|
struct inode *inode = d_inode(cfile->dentry);
|
|
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
|
|
struct file_lock *flock;
|
|
struct file_lock_context *flctx = locks_inode_context(inode);
|
|
unsigned int count = 0, i;
|
|
int rc = 0, xid, type;
|
|
struct list_head locks_to_send, *el;
|
|
struct lock_to_push *lck, *tmp;
|
|
__u64 length;
|
|
|
|
xid = get_xid();
|
|
|
|
if (!flctx)
|
|
goto out;
|
|
|
|
spin_lock(&flctx->flc_lock);
|
|
list_for_each(el, &flctx->flc_posix) {
|
|
count++;
|
|
}
|
|
spin_unlock(&flctx->flc_lock);
|
|
|
|
INIT_LIST_HEAD(&locks_to_send);
|
|
|
|
/*
|
|
* Allocating count locks is enough because no FL_POSIX locks can be
|
|
* added to the list while we are holding cinode->lock_sem that
|
|
* protects locking operations of this inode.
|
|
*/
|
|
for (i = 0; i < count; i++) {
|
|
lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL);
|
|
if (!lck) {
|
|
rc = -ENOMEM;
|
|
goto err_out;
|
|
}
|
|
list_add_tail(&lck->llist, &locks_to_send);
|
|
}
|
|
|
|
el = locks_to_send.next;
|
|
spin_lock(&flctx->flc_lock);
|
|
list_for_each_entry(flock, &flctx->flc_posix, fl_list) {
|
|
if (el == &locks_to_send) {
|
|
/*
|
|
* The list ended. We don't have enough allocated
|
|
* structures - something is really wrong.
|
|
*/
|
|
cifs_dbg(VFS, "Can't push all brlocks!\n");
|
|
break;
|
|
}
|
|
length = cifs_flock_len(flock);
|
|
if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK)
|
|
type = CIFS_RDLCK;
|
|
else
|
|
type = CIFS_WRLCK;
|
|
lck = list_entry(el, struct lock_to_push, llist);
|
|
lck->pid = hash_lockowner(flock->fl_owner);
|
|
lck->netfid = cfile->fid.netfid;
|
|
lck->length = length;
|
|
lck->type = type;
|
|
lck->offset = flock->fl_start;
|
|
}
|
|
spin_unlock(&flctx->flc_lock);
|
|
|
|
list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) {
|
|
int stored_rc;
|
|
|
|
stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid,
|
|
lck->offset, lck->length, NULL,
|
|
lck->type, 0);
|
|
if (stored_rc)
|
|
rc = stored_rc;
|
|
list_del(&lck->llist);
|
|
kfree(lck);
|
|
}
|
|
|
|
out:
|
|
free_xid(xid);
|
|
return rc;
|
|
err_out:
|
|
list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) {
|
|
list_del(&lck->llist);
|
|
kfree(lck);
|
|
}
|
|
goto out;
|
|
}
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|
|
|
|
static int
|
|
cifs_push_locks(struct cifsFileInfo *cfile)
|
|
{
|
|
struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
|
|
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
|
|
int rc = 0;
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|
|
|
|
/* we are going to update can_cache_brlcks here - need a write access */
|
|
cifs_down_write(&cinode->lock_sem);
|
|
if (!cinode->can_cache_brlcks) {
|
|
up_write(&cinode->lock_sem);
|
|
return rc;
|
|
}
|
|
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
if (cap_unix(tcon->ses) &&
|
|
(CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
|
|
((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
|
|
rc = cifs_push_posix_locks(cfile);
|
|
else
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|
|
rc = tcon->ses->server->ops->push_mand_locks(cfile);
|
|
|
|
cinode->can_cache_brlcks = false;
|
|
up_write(&cinode->lock_sem);
|
|
return rc;
|
|
}
|
|
|
|
static void
|
|
cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock,
|
|
bool *wait_flag, struct TCP_Server_Info *server)
|
|
{
|
|
if (flock->fl_flags & FL_POSIX)
|
|
cifs_dbg(FYI, "Posix\n");
|
|
if (flock->fl_flags & FL_FLOCK)
|
|
cifs_dbg(FYI, "Flock\n");
|
|
if (flock->fl_flags & FL_SLEEP) {
|
|
cifs_dbg(FYI, "Blocking lock\n");
|
|
*wait_flag = true;
|
|
}
|
|
if (flock->fl_flags & FL_ACCESS)
|
|
cifs_dbg(FYI, "Process suspended by mandatory locking - not implemented yet\n");
|
|
if (flock->fl_flags & FL_LEASE)
|
|
cifs_dbg(FYI, "Lease on file - not implemented yet\n");
|
|
if (flock->fl_flags &
|
|
(~(FL_POSIX | FL_FLOCK | FL_SLEEP |
|
|
FL_ACCESS | FL_LEASE | FL_CLOSE | FL_OFDLCK)))
|
|
cifs_dbg(FYI, "Unknown lock flags 0x%x\n", flock->fl_flags);
|
|
|
|
*type = server->vals->large_lock_type;
|
|
if (flock->fl_type == F_WRLCK) {
|
|
cifs_dbg(FYI, "F_WRLCK\n");
|
|
*type |= server->vals->exclusive_lock_type;
|
|
*lock = 1;
|
|
} else if (flock->fl_type == F_UNLCK) {
|
|
cifs_dbg(FYI, "F_UNLCK\n");
|
|
*type |= server->vals->unlock_lock_type;
|
|
*unlock = 1;
|
|
/* Check if unlock includes more than one lock range */
|
|
} else if (flock->fl_type == F_RDLCK) {
|
|
cifs_dbg(FYI, "F_RDLCK\n");
|
|
*type |= server->vals->shared_lock_type;
|
|
*lock = 1;
|
|
} else if (flock->fl_type == F_EXLCK) {
|
|
cifs_dbg(FYI, "F_EXLCK\n");
|
|
*type |= server->vals->exclusive_lock_type;
|
|
*lock = 1;
|
|
} else if (flock->fl_type == F_SHLCK) {
|
|
cifs_dbg(FYI, "F_SHLCK\n");
|
|
*type |= server->vals->shared_lock_type;
|
|
*lock = 1;
|
|
} else
|
|
cifs_dbg(FYI, "Unknown type of lock\n");
|
|
}
|
|
|
|
static int
|
|
cifs_getlk(struct file *file, struct file_lock *flock, __u32 type,
|
|
bool wait_flag, bool posix_lck, unsigned int xid)
|
|
{
|
|
int rc = 0;
|
|
__u64 length = cifs_flock_len(flock);
|
|
struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
|
|
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
|
|
struct TCP_Server_Info *server = tcon->ses->server;
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
__u16 netfid = cfile->fid.netfid;
|
|
|
|
if (posix_lck) {
|
|
int posix_lock_type;
|
|
|
|
rc = cifs_posix_lock_test(file, flock);
|
|
if (!rc)
|
|
return rc;
|
|
|
|
if (type & server->vals->shared_lock_type)
|
|
posix_lock_type = CIFS_RDLCK;
|
|
else
|
|
posix_lock_type = CIFS_WRLCK;
|
|
rc = CIFSSMBPosixLock(xid, tcon, netfid,
|
|
hash_lockowner(flock->fl_owner),
|
|
flock->fl_start, length, flock,
|
|
posix_lock_type, wait_flag);
|
|
return rc;
|
|
}
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|
|
|
|
rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock);
|
|
if (!rc)
|
|
return rc;
|
|
|
|
/* BB we could chain these into one lock request BB */
|
|
rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type,
|
|
1, 0, false);
|
|
if (rc == 0) {
|
|
rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
|
|
type, 0, 1, false);
|
|
flock->fl_type = F_UNLCK;
|
|
if (rc != 0)
|
|
cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n",
|
|
rc);
|
|
return 0;
|
|
}
|
|
|
|
if (type & server->vals->shared_lock_type) {
|
|
flock->fl_type = F_WRLCK;
|
|
return 0;
|
|
}
|
|
|
|
type &= ~server->vals->exclusive_lock_type;
|
|
|
|
rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
|
|
type | server->vals->shared_lock_type,
|
|
1, 0, false);
|
|
if (rc == 0) {
|
|
rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
|
|
type | server->vals->shared_lock_type, 0, 1, false);
|
|
flock->fl_type = F_RDLCK;
|
|
if (rc != 0)
|
|
cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n",
|
|
rc);
|
|
} else
|
|
flock->fl_type = F_WRLCK;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
cifs_move_llist(struct list_head *source, struct list_head *dest)
|
|
{
|
|
struct list_head *li, *tmp;
|
|
list_for_each_safe(li, tmp, source)
|
|
list_move(li, dest);
|
|
}
|
|
|
|
void
|
|
cifs_free_llist(struct list_head *llist)
|
|
{
|
|
struct cifsLockInfo *li, *tmp;
|
|
list_for_each_entry_safe(li, tmp, llist, llist) {
|
|
cifs_del_lock_waiters(li);
|
|
list_del(&li->llist);
|
|
kfree(li);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
int
|
|
cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
|
|
unsigned int xid)
|
|
{
|
|
int rc = 0, stored_rc;
|
|
static const int types[] = {
|
|
LOCKING_ANDX_LARGE_FILES,
|
|
LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES
|
|
};
|
|
unsigned int i;
|
|
unsigned int max_num, num, max_buf;
|
|
LOCKING_ANDX_RANGE *buf, *cur;
|
|
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
|
|
struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
|
|
struct cifsLockInfo *li, *tmp;
|
|
__u64 length = cifs_flock_len(flock);
|
|
struct list_head tmp_llist;
|
|
|
|
INIT_LIST_HEAD(&tmp_llist);
|
|
|
|
/*
|
|
* Accessing maxBuf is racy with cifs_reconnect - need to store value
|
|
* and check it before using.
|
|
*/
|
|
max_buf = tcon->ses->server->maxBuf;
|
|
if (max_buf < (sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE)))
|
|
return -EINVAL;
|
|
|
|
BUILD_BUG_ON(sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE) >
|
|
PAGE_SIZE);
|
|
max_buf = min_t(unsigned int, max_buf - sizeof(struct smb_hdr),
|
|
PAGE_SIZE);
|
|
max_num = (max_buf - sizeof(struct smb_hdr)) /
|
|
sizeof(LOCKING_ANDX_RANGE);
|
|
buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
cifs_down_write(&cinode->lock_sem);
|
|
for (i = 0; i < 2; i++) {
|
|
cur = buf;
|
|
num = 0;
|
|
list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
|
|
if (flock->fl_start > li->offset ||
|
|
(flock->fl_start + length) <
|
|
(li->offset + li->length))
|
|
continue;
|
|
if (current->tgid != li->pid)
|
|
continue;
|
|
if (types[i] != li->type)
|
|
continue;
|
|
if (cinode->can_cache_brlcks) {
|
|
/*
|
|
* We can cache brlock requests - simply remove
|
|
* a lock from the file's list.
|
|
*/
|
|
list_del(&li->llist);
|
|
cifs_del_lock_waiters(li);
|
|
kfree(li);
|
|
continue;
|
|
}
|
|
cur->Pid = cpu_to_le16(li->pid);
|
|
cur->LengthLow = cpu_to_le32((u32)li->length);
|
|
cur->LengthHigh = cpu_to_le32((u32)(li->length>>32));
|
|
cur->OffsetLow = cpu_to_le32((u32)li->offset);
|
|
cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32));
|
|
/*
|
|
* We need to save a lock here to let us add it again to
|
|
* the file's list if the unlock range request fails on
|
|
* the server.
|
|
*/
|
|
list_move(&li->llist, &tmp_llist);
|
|
if (++num == max_num) {
|
|
stored_rc = cifs_lockv(xid, tcon,
|
|
cfile->fid.netfid,
|
|
li->type, num, 0, buf);
|
|
if (stored_rc) {
|
|
/*
|
|
* We failed on the unlock range
|
|
* request - add all locks from the tmp
|
|
* list to the head of the file's list.
|
|
*/
|
|
cifs_move_llist(&tmp_llist,
|
|
&cfile->llist->locks);
|
|
rc = stored_rc;
|
|
} else
|
|
/*
|
|
* The unlock range request succeed -
|
|
* free the tmp list.
|
|
*/
|
|
cifs_free_llist(&tmp_llist);
|
|
cur = buf;
|
|
num = 0;
|
|
} else
|
|
cur++;
|
|
}
|
|
if (num) {
|
|
stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid,
|
|
types[i], num, 0, buf);
|
|
if (stored_rc) {
|
|
cifs_move_llist(&tmp_llist,
|
|
&cfile->llist->locks);
|
|
rc = stored_rc;
|
|
} else
|
|
cifs_free_llist(&tmp_llist);
|
|
}
|
|
}
|
|
|
|
up_write(&cinode->lock_sem);
|
|
kfree(buf);
|
|
return rc;
|
|
}
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|
|
|
|
static int
|
|
cifs_setlk(struct file *file, struct file_lock *flock, __u32 type,
|
|
bool wait_flag, bool posix_lck, int lock, int unlock,
|
|
unsigned int xid)
|
|
{
|
|
int rc = 0;
|
|
__u64 length = cifs_flock_len(flock);
|
|
struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
|
|
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
|
|
struct TCP_Server_Info *server = tcon->ses->server;
|
|
struct inode *inode = d_inode(cfile->dentry);
|
|
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
if (posix_lck) {
|
|
int posix_lock_type;
|
|
|
|
rc = cifs_posix_lock_set(file, flock);
|
|
if (rc <= FILE_LOCK_DEFERRED)
|
|
return rc;
|
|
|
|
if (type & server->vals->shared_lock_type)
|
|
posix_lock_type = CIFS_RDLCK;
|
|
else
|
|
posix_lock_type = CIFS_WRLCK;
|
|
|
|
if (unlock == 1)
|
|
posix_lock_type = CIFS_UNLCK;
|
|
|
|
rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid,
|
|
hash_lockowner(flock->fl_owner),
|
|
flock->fl_start, length,
|
|
NULL, posix_lock_type, wait_flag);
|
|
goto out;
|
|
}
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|
|
if (lock) {
|
|
struct cifsLockInfo *lock;
|
|
|
|
lock = cifs_lock_init(flock->fl_start, length, type,
|
|
flock->fl_flags);
|
|
if (!lock)
|
|
return -ENOMEM;
|
|
|
|
rc = cifs_lock_add_if(cfile, lock, wait_flag);
|
|
if (rc < 0) {
|
|
kfree(lock);
|
|
return rc;
|
|
}
|
|
if (!rc)
|
|
goto out;
|
|
|
|
/*
|
|
* Windows 7 server can delay breaking lease from read to None
|
|
* if we set a byte-range lock on a file - break it explicitly
|
|
* before sending the lock to the server to be sure the next
|
|
* read won't conflict with non-overlapted locks due to
|
|
* pagereading.
|
|
*/
|
|
if (!CIFS_CACHE_WRITE(CIFS_I(inode)) &&
|
|
CIFS_CACHE_READ(CIFS_I(inode))) {
|
|
cifs_zap_mapping(inode);
|
|
cifs_dbg(FYI, "Set no oplock for inode=%p due to mand locks\n",
|
|
inode);
|
|
CIFS_I(inode)->oplock = 0;
|
|
}
|
|
|
|
rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
|
|
type, 1, 0, wait_flag);
|
|
if (rc) {
|
|
kfree(lock);
|
|
return rc;
|
|
}
|
|
|
|
cifs_lock_add(cfile, lock);
|
|
} else if (unlock)
|
|
rc = server->ops->mand_unlock_range(cfile, flock, xid);
|
|
|
|
out:
|
|
if ((flock->fl_flags & FL_POSIX) || (flock->fl_flags & FL_FLOCK)) {
|
|
/*
|
|
* If this is a request to remove all locks because we
|
|
* are closing the file, it doesn't matter if the
|
|
* unlocking failed as both cifs.ko and the SMB server
|
|
* remove the lock on file close
|
|
*/
|
|
if (rc) {
|
|
cifs_dbg(VFS, "%s failed rc=%d\n", __func__, rc);
|
|
if (!(flock->fl_flags & FL_CLOSE))
|
|
return rc;
|
|
}
|
|
rc = locks_lock_file_wait(file, flock);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int cifs_flock(struct file *file, int cmd, struct file_lock *fl)
|
|
{
|
|
int rc, xid;
|
|
int lock = 0, unlock = 0;
|
|
bool wait_flag = false;
|
|
bool posix_lck = false;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifs_tcon *tcon;
|
|
struct cifsFileInfo *cfile;
|
|
__u32 type;
|
|
|
|
xid = get_xid();
|
|
|
|
if (!(fl->fl_flags & FL_FLOCK)) {
|
|
rc = -ENOLCK;
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
|
|
cfile = (struct cifsFileInfo *)file->private_data;
|
|
tcon = tlink_tcon(cfile->tlink);
|
|
|
|
cifs_read_flock(fl, &type, &lock, &unlock, &wait_flag,
|
|
tcon->ses->server);
|
|
cifs_sb = CIFS_FILE_SB(file);
|
|
|
|
if (cap_unix(tcon->ses) &&
|
|
(CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
|
|
((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
|
|
posix_lck = true;
|
|
|
|
if (!lock && !unlock) {
|
|
/*
|
|
* if no lock or unlock then nothing to do since we do not
|
|
* know what it is
|
|
*/
|
|
rc = -EOPNOTSUPP;
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
|
|
rc = cifs_setlk(file, fl, type, wait_flag, posix_lck, lock, unlock,
|
|
xid);
|
|
free_xid(xid);
|
|
return rc;
|
|
|
|
|
|
}
|
|
|
|
int cifs_lock(struct file *file, int cmd, struct file_lock *flock)
|
|
{
|
|
int rc, xid;
|
|
int lock = 0, unlock = 0;
|
|
bool wait_flag = false;
|
|
bool posix_lck = false;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifs_tcon *tcon;
|
|
struct cifsFileInfo *cfile;
|
|
__u32 type;
|
|
|
|
rc = -EACCES;
|
|
xid = get_xid();
|
|
|
|
cifs_dbg(FYI, "%s: %pD2 cmd=0x%x type=0x%x flags=0x%x r=%lld:%lld\n", __func__, file, cmd,
|
|
flock->fl_flags, flock->fl_type, (long long)flock->fl_start,
|
|
(long long)flock->fl_end);
|
|
|
|
cfile = (struct cifsFileInfo *)file->private_data;
|
|
tcon = tlink_tcon(cfile->tlink);
|
|
|
|
cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag,
|
|
tcon->ses->server);
|
|
cifs_sb = CIFS_FILE_SB(file);
|
|
set_bit(CIFS_INO_CLOSE_ON_LOCK, &CIFS_I(d_inode(cfile->dentry))->flags);
|
|
|
|
if (cap_unix(tcon->ses) &&
|
|
(CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
|
|
((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
|
|
posix_lck = true;
|
|
/*
|
|
* BB add code here to normalize offset and length to account for
|
|
* negative length which we can not accept over the wire.
|
|
*/
|
|
if (IS_GETLK(cmd)) {
|
|
rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid);
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
|
|
if (!lock && !unlock) {
|
|
/*
|
|
* if no lock or unlock then nothing to do since we do not
|
|
* know what it is
|
|
*/
|
|
free_xid(xid);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock,
|
|
xid);
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* update the file size (if needed) after a write. Should be called with
|
|
* the inode->i_lock held
|
|
*/
|
|
void
|
|
cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset,
|
|
unsigned int bytes_written)
|
|
{
|
|
loff_t end_of_write = offset + bytes_written;
|
|
|
|
if (end_of_write > cifsi->server_eof)
|
|
cifsi->server_eof = end_of_write;
|
|
}
|
|
|
|
static ssize_t
|
|
cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data,
|
|
size_t write_size, loff_t *offset)
|
|
{
|
|
int rc = 0;
|
|
unsigned int bytes_written = 0;
|
|
unsigned int total_written;
|
|
struct cifs_tcon *tcon;
|
|
struct TCP_Server_Info *server;
|
|
unsigned int xid;
|
|
struct dentry *dentry = open_file->dentry;
|
|
struct cifsInodeInfo *cifsi = CIFS_I(d_inode(dentry));
|
|
struct cifs_io_parms io_parms = {0};
|
|
|
|
cifs_dbg(FYI, "write %zd bytes to offset %lld of %pd\n",
|
|
write_size, *offset, dentry);
|
|
|
|
tcon = tlink_tcon(open_file->tlink);
|
|
server = tcon->ses->server;
|
|
|
|
if (!server->ops->sync_write)
|
|
return -ENOSYS;
|
|
|
|
xid = get_xid();
|
|
|
|
for (total_written = 0; write_size > total_written;
|
|
total_written += bytes_written) {
|
|
rc = -EAGAIN;
|
|
while (rc == -EAGAIN) {
|
|
struct kvec iov[2];
|
|
unsigned int len;
|
|
|
|
if (open_file->invalidHandle) {
|
|
/* we could deadlock if we called
|
|
filemap_fdatawait from here so tell
|
|
reopen_file not to flush data to
|
|
server now */
|
|
rc = cifs_reopen_file(open_file, false);
|
|
if (rc != 0)
|
|
break;
|
|
}
|
|
|
|
len = min(server->ops->wp_retry_size(d_inode(dentry)),
|
|
(unsigned int)write_size - total_written);
|
|
/* iov[0] is reserved for smb header */
|
|
iov[1].iov_base = (char *)write_data + total_written;
|
|
iov[1].iov_len = len;
|
|
io_parms.pid = pid;
|
|
io_parms.tcon = tcon;
|
|
io_parms.offset = *offset;
|
|
io_parms.length = len;
|
|
rc = server->ops->sync_write(xid, &open_file->fid,
|
|
&io_parms, &bytes_written, iov, 1);
|
|
}
|
|
if (rc || (bytes_written == 0)) {
|
|
if (total_written)
|
|
break;
|
|
else {
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
} else {
|
|
spin_lock(&d_inode(dentry)->i_lock);
|
|
cifs_update_eof(cifsi, *offset, bytes_written);
|
|
spin_unlock(&d_inode(dentry)->i_lock);
|
|
*offset += bytes_written;
|
|
}
|
|
}
|
|
|
|
cifs_stats_bytes_written(tcon, total_written);
|
|
|
|
if (total_written > 0) {
|
|
spin_lock(&d_inode(dentry)->i_lock);
|
|
if (*offset > d_inode(dentry)->i_size) {
|
|
i_size_write(d_inode(dentry), *offset);
|
|
d_inode(dentry)->i_blocks = (512 - 1 + *offset) >> 9;
|
|
}
|
|
spin_unlock(&d_inode(dentry)->i_lock);
|
|
}
|
|
mark_inode_dirty_sync(d_inode(dentry));
|
|
free_xid(xid);
|
|
return total_written;
|
|
}
|
|
|
|
struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode,
|
|
bool fsuid_only)
|
|
{
|
|
struct cifsFileInfo *open_file = NULL;
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->netfs.inode.i_sb);
|
|
|
|
/* only filter by fsuid on multiuser mounts */
|
|
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
|
|
fsuid_only = false;
|
|
|
|
spin_lock(&cifs_inode->open_file_lock);
|
|
/* we could simply get the first_list_entry since write-only entries
|
|
are always at the end of the list but since the first entry might
|
|
have a close pending, we go through the whole list */
|
|
list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
|
|
if (fsuid_only && !uid_eq(open_file->uid, current_fsuid()))
|
|
continue;
|
|
if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) {
|
|
if ((!open_file->invalidHandle)) {
|
|
/* found a good file */
|
|
/* lock it so it will not be closed on us */
|
|
cifsFileInfo_get(open_file);
|
|
spin_unlock(&cifs_inode->open_file_lock);
|
|
return open_file;
|
|
} /* else might as well continue, and look for
|
|
another, or simply have the caller reopen it
|
|
again rather than trying to fix this handle */
|
|
} else /* write only file */
|
|
break; /* write only files are last so must be done */
|
|
}
|
|
spin_unlock(&cifs_inode->open_file_lock);
|
|
return NULL;
|
|
}
|
|
|
|
/* Return -EBADF if no handle is found and general rc otherwise */
|
|
int
|
|
cifs_get_writable_file(struct cifsInodeInfo *cifs_inode, int flags,
|
|
struct cifsFileInfo **ret_file)
|
|
{
|
|
struct cifsFileInfo *open_file, *inv_file = NULL;
|
|
struct cifs_sb_info *cifs_sb;
|
|
bool any_available = false;
|
|
int rc = -EBADF;
|
|
unsigned int refind = 0;
|
|
bool fsuid_only = flags & FIND_WR_FSUID_ONLY;
|
|
bool with_delete = flags & FIND_WR_WITH_DELETE;
|
|
*ret_file = NULL;
|
|
|
|
/*
|
|
* Having a null inode here (because mapping->host was set to zero by
|
|
* the VFS or MM) should not happen but we had reports of on oops (due
|
|
* to it being zero) during stress testcases so we need to check for it
|
|
*/
|
|
|
|
if (cifs_inode == NULL) {
|
|
cifs_dbg(VFS, "Null inode passed to cifs_writeable_file\n");
|
|
dump_stack();
|
|
return rc;
|
|
}
|
|
|
|
cifs_sb = CIFS_SB(cifs_inode->netfs.inode.i_sb);
|
|
|
|
/* only filter by fsuid on multiuser mounts */
|
|
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
|
|
fsuid_only = false;
|
|
|
|
spin_lock(&cifs_inode->open_file_lock);
|
|
refind_writable:
|
|
if (refind > MAX_REOPEN_ATT) {
|
|
spin_unlock(&cifs_inode->open_file_lock);
|
|
return rc;
|
|
}
|
|
list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
|
|
if (!any_available && open_file->pid != current->tgid)
|
|
continue;
|
|
if (fsuid_only && !uid_eq(open_file->uid, current_fsuid()))
|
|
continue;
|
|
if (with_delete && !(open_file->fid.access & DELETE))
|
|
continue;
|
|
if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
|
|
if (!open_file->invalidHandle) {
|
|
/* found a good writable file */
|
|
cifsFileInfo_get(open_file);
|
|
spin_unlock(&cifs_inode->open_file_lock);
|
|
*ret_file = open_file;
|
|
return 0;
|
|
} else {
|
|
if (!inv_file)
|
|
inv_file = open_file;
|
|
}
|
|
}
|
|
}
|
|
/* couldn't find useable FH with same pid, try any available */
|
|
if (!any_available) {
|
|
any_available = true;
|
|
goto refind_writable;
|
|
}
|
|
|
|
if (inv_file) {
|
|
any_available = false;
|
|
cifsFileInfo_get(inv_file);
|
|
}
|
|
|
|
spin_unlock(&cifs_inode->open_file_lock);
|
|
|
|
if (inv_file) {
|
|
rc = cifs_reopen_file(inv_file, false);
|
|
if (!rc) {
|
|
*ret_file = inv_file;
|
|
return 0;
|
|
}
|
|
|
|
spin_lock(&cifs_inode->open_file_lock);
|
|
list_move_tail(&inv_file->flist, &cifs_inode->openFileList);
|
|
spin_unlock(&cifs_inode->open_file_lock);
|
|
cifsFileInfo_put(inv_file);
|
|
++refind;
|
|
inv_file = NULL;
|
|
spin_lock(&cifs_inode->open_file_lock);
|
|
goto refind_writable;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
struct cifsFileInfo *
|
|
find_writable_file(struct cifsInodeInfo *cifs_inode, int flags)
|
|
{
|
|
struct cifsFileInfo *cfile;
|
|
int rc;
|
|
|
|
rc = cifs_get_writable_file(cifs_inode, flags, &cfile);
|
|
if (rc)
|
|
cifs_dbg(FYI, "Couldn't find writable handle rc=%d\n", rc);
|
|
|
|
return cfile;
|
|
}
|
|
|
|
int
|
|
cifs_get_writable_path(struct cifs_tcon *tcon, const char *name,
|
|
int flags,
|
|
struct cifsFileInfo **ret_file)
|
|
{
|
|
struct cifsFileInfo *cfile;
|
|
void *page = alloc_dentry_path();
|
|
|
|
*ret_file = NULL;
|
|
|
|
spin_lock(&tcon->open_file_lock);
|
|
list_for_each_entry(cfile, &tcon->openFileList, tlist) {
|
|
struct cifsInodeInfo *cinode;
|
|
const char *full_path = build_path_from_dentry(cfile->dentry, page);
|
|
if (IS_ERR(full_path)) {
|
|
spin_unlock(&tcon->open_file_lock);
|
|
free_dentry_path(page);
|
|
return PTR_ERR(full_path);
|
|
}
|
|
if (strcmp(full_path, name))
|
|
continue;
|
|
|
|
cinode = CIFS_I(d_inode(cfile->dentry));
|
|
spin_unlock(&tcon->open_file_lock);
|
|
free_dentry_path(page);
|
|
return cifs_get_writable_file(cinode, flags, ret_file);
|
|
}
|
|
|
|
spin_unlock(&tcon->open_file_lock);
|
|
free_dentry_path(page);
|
|
return -ENOENT;
|
|
}
|
|
|
|
int
|
|
cifs_get_readable_path(struct cifs_tcon *tcon, const char *name,
|
|
struct cifsFileInfo **ret_file)
|
|
{
|
|
struct cifsFileInfo *cfile;
|
|
void *page = alloc_dentry_path();
|
|
|
|
*ret_file = NULL;
|
|
|
|
spin_lock(&tcon->open_file_lock);
|
|
list_for_each_entry(cfile, &tcon->openFileList, tlist) {
|
|
struct cifsInodeInfo *cinode;
|
|
const char *full_path = build_path_from_dentry(cfile->dentry, page);
|
|
if (IS_ERR(full_path)) {
|
|
spin_unlock(&tcon->open_file_lock);
|
|
free_dentry_path(page);
|
|
return PTR_ERR(full_path);
|
|
}
|
|
if (strcmp(full_path, name))
|
|
continue;
|
|
|
|
cinode = CIFS_I(d_inode(cfile->dentry));
|
|
spin_unlock(&tcon->open_file_lock);
|
|
free_dentry_path(page);
|
|
*ret_file = find_readable_file(cinode, 0);
|
|
return *ret_file ? 0 : -ENOENT;
|
|
}
|
|
|
|
spin_unlock(&tcon->open_file_lock);
|
|
free_dentry_path(page);
|
|
return -ENOENT;
|
|
}
|
|
|
|
void
|
|
cifs_writedata_release(struct kref *refcount)
|
|
{
|
|
struct cifs_writedata *wdata = container_of(refcount,
|
|
struct cifs_writedata, refcount);
|
|
#ifdef CONFIG_CIFS_SMB_DIRECT
|
|
if (wdata->mr) {
|
|
smbd_deregister_mr(wdata->mr);
|
|
wdata->mr = NULL;
|
|
}
|
|
#endif
|
|
|
|
if (wdata->cfile)
|
|
cifsFileInfo_put(wdata->cfile);
|
|
|
|
kfree(wdata);
|
|
}
|
|
|
|
/*
|
|
* Write failed with a retryable error. Resend the write request. It's also
|
|
* possible that the page was redirtied so re-clean the page.
|
|
*/
|
|
static void
|
|
cifs_writev_requeue(struct cifs_writedata *wdata)
|
|
{
|
|
int rc = 0;
|
|
struct inode *inode = d_inode(wdata->cfile->dentry);
|
|
struct TCP_Server_Info *server;
|
|
unsigned int rest_len = wdata->bytes;
|
|
loff_t fpos = wdata->offset;
|
|
|
|
server = tlink_tcon(wdata->cfile->tlink)->ses->server;
|
|
do {
|
|
struct cifs_writedata *wdata2;
|
|
unsigned int wsize, cur_len;
|
|
|
|
wsize = server->ops->wp_retry_size(inode);
|
|
if (wsize < rest_len) {
|
|
if (wsize < PAGE_SIZE) {
|
|
rc = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
cur_len = min(round_down(wsize, PAGE_SIZE), rest_len);
|
|
} else {
|
|
cur_len = rest_len;
|
|
}
|
|
|
|
wdata2 = cifs_writedata_alloc(cifs_writev_complete);
|
|
if (!wdata2) {
|
|
rc = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
wdata2->sync_mode = wdata->sync_mode;
|
|
wdata2->offset = fpos;
|
|
wdata2->bytes = cur_len;
|
|
wdata2->iter = wdata->iter;
|
|
|
|
iov_iter_advance(&wdata2->iter, fpos - wdata->offset);
|
|
iov_iter_truncate(&wdata2->iter, wdata2->bytes);
|
|
|
|
if (iov_iter_is_xarray(&wdata2->iter))
|
|
/* Check for pages having been redirtied and clean
|
|
* them. We can do this by walking the xarray. If
|
|
* it's not an xarray, then it's a DIO and we shouldn't
|
|
* be mucking around with the page bits.
|
|
*/
|
|
cifs_undirty_folios(inode, fpos, cur_len);
|
|
|
|
rc = cifs_get_writable_file(CIFS_I(inode), FIND_WR_ANY,
|
|
&wdata2->cfile);
|
|
if (!wdata2->cfile) {
|
|
cifs_dbg(VFS, "No writable handle to retry writepages rc=%d\n",
|
|
rc);
|
|
if (!is_retryable_error(rc))
|
|
rc = -EBADF;
|
|
} else {
|
|
wdata2->pid = wdata2->cfile->pid;
|
|
rc = server->ops->async_writev(wdata2,
|
|
cifs_writedata_release);
|
|
}
|
|
|
|
kref_put(&wdata2->refcount, cifs_writedata_release);
|
|
if (rc) {
|
|
if (is_retryable_error(rc))
|
|
continue;
|
|
fpos += cur_len;
|
|
rest_len -= cur_len;
|
|
break;
|
|
}
|
|
|
|
fpos += cur_len;
|
|
rest_len -= cur_len;
|
|
} while (rest_len > 0);
|
|
|
|
/* Clean up remaining pages from the original wdata */
|
|
if (iov_iter_is_xarray(&wdata->iter))
|
|
cifs_pages_write_failed(inode, fpos, rest_len);
|
|
|
|
if (rc != 0 && !is_retryable_error(rc))
|
|
mapping_set_error(inode->i_mapping, rc);
|
|
kref_put(&wdata->refcount, cifs_writedata_release);
|
|
}
|
|
|
|
void
|
|
cifs_writev_complete(struct work_struct *work)
|
|
{
|
|
struct cifs_writedata *wdata = container_of(work,
|
|
struct cifs_writedata, work);
|
|
struct inode *inode = d_inode(wdata->cfile->dentry);
|
|
|
|
if (wdata->result == 0) {
|
|
spin_lock(&inode->i_lock);
|
|
cifs_update_eof(CIFS_I(inode), wdata->offset, wdata->bytes);
|
|
spin_unlock(&inode->i_lock);
|
|
cifs_stats_bytes_written(tlink_tcon(wdata->cfile->tlink),
|
|
wdata->bytes);
|
|
} else if (wdata->sync_mode == WB_SYNC_ALL && wdata->result == -EAGAIN)
|
|
return cifs_writev_requeue(wdata);
|
|
|
|
if (wdata->result == -EAGAIN)
|
|
cifs_pages_write_redirty(inode, wdata->offset, wdata->bytes);
|
|
else if (wdata->result < 0)
|
|
cifs_pages_write_failed(inode, wdata->offset, wdata->bytes);
|
|
else
|
|
cifs_pages_written_back(inode, wdata->offset, wdata->bytes);
|
|
|
|
if (wdata->result != -EAGAIN)
|
|
mapping_set_error(inode->i_mapping, wdata->result);
|
|
kref_put(&wdata->refcount, cifs_writedata_release);
|
|
}
|
|
|
|
struct cifs_writedata *cifs_writedata_alloc(work_func_t complete)
|
|
{
|
|
struct cifs_writedata *wdata;
|
|
|
|
wdata = kzalloc(sizeof(*wdata), GFP_NOFS);
|
|
if (wdata != NULL) {
|
|
kref_init(&wdata->refcount);
|
|
INIT_LIST_HEAD(&wdata->list);
|
|
init_completion(&wdata->done);
|
|
INIT_WORK(&wdata->work, complete);
|
|
}
|
|
return wdata;
|
|
}
|
|
|
|
static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
|
|
{
|
|
struct address_space *mapping = page->mapping;
|
|
loff_t offset = (loff_t)page->index << PAGE_SHIFT;
|
|
char *write_data;
|
|
int rc = -EFAULT;
|
|
int bytes_written = 0;
|
|
struct inode *inode;
|
|
struct cifsFileInfo *open_file;
|
|
|
|
if (!mapping || !mapping->host)
|
|
return -EFAULT;
|
|
|
|
inode = page->mapping->host;
|
|
|
|
offset += (loff_t)from;
|
|
write_data = kmap(page);
|
|
write_data += from;
|
|
|
|
if ((to > PAGE_SIZE) || (from > to)) {
|
|
kunmap(page);
|
|
return -EIO;
|
|
}
|
|
|
|
/* racing with truncate? */
|
|
if (offset > mapping->host->i_size) {
|
|
kunmap(page);
|
|
return 0; /* don't care */
|
|
}
|
|
|
|
/* check to make sure that we are not extending the file */
|
|
if (mapping->host->i_size - offset < (loff_t)to)
|
|
to = (unsigned)(mapping->host->i_size - offset);
|
|
|
|
rc = cifs_get_writable_file(CIFS_I(mapping->host), FIND_WR_ANY,
|
|
&open_file);
|
|
if (!rc) {
|
|
bytes_written = cifs_write(open_file, open_file->pid,
|
|
write_data, to - from, &offset);
|
|
cifsFileInfo_put(open_file);
|
|
/* Does mm or vfs already set times? */
|
|
inode->i_atime = inode->i_mtime = current_time(inode);
|
|
if ((bytes_written > 0) && (offset))
|
|
rc = 0;
|
|
else if (bytes_written < 0)
|
|
rc = bytes_written;
|
|
else
|
|
rc = -EFAULT;
|
|
} else {
|
|
cifs_dbg(FYI, "No writable handle for write page rc=%d\n", rc);
|
|
if (!is_retryable_error(rc))
|
|
rc = -EIO;
|
|
}
|
|
|
|
kunmap(page);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Extend the region to be written back to include subsequent contiguously
|
|
* dirty pages if possible, but don't sleep while doing so.
|
|
*/
|
|
static void cifs_extend_writeback(struct address_space *mapping,
|
|
long *_count,
|
|
loff_t start,
|
|
int max_pages,
|
|
size_t max_len,
|
|
unsigned int *_len)
|
|
{
|
|
struct folio_batch batch;
|
|
struct folio *folio;
|
|
unsigned int psize, nr_pages;
|
|
size_t len = *_len;
|
|
pgoff_t index = (start + len) / PAGE_SIZE;
|
|
bool stop = true;
|
|
unsigned int i;
|
|
XA_STATE(xas, &mapping->i_pages, index);
|
|
|
|
folio_batch_init(&batch);
|
|
|
|
do {
|
|
/* Firstly, we gather up a batch of contiguous dirty pages
|
|
* under the RCU read lock - but we can't clear the dirty flags
|
|
* there if any of those pages are mapped.
|
|
*/
|
|
rcu_read_lock();
|
|
|
|
xas_for_each(&xas, folio, ULONG_MAX) {
|
|
stop = true;
|
|
if (xas_retry(&xas, folio))
|
|
continue;
|
|
if (xa_is_value(folio))
|
|
break;
|
|
if (folio_index(folio) != index)
|
|
break;
|
|
if (!folio_try_get_rcu(folio)) {
|
|
xas_reset(&xas);
|
|
continue;
|
|
}
|
|
nr_pages = folio_nr_pages(folio);
|
|
if (nr_pages > max_pages)
|
|
break;
|
|
|
|
/* Has the page moved or been split? */
|
|
if (unlikely(folio != xas_reload(&xas))) {
|
|
folio_put(folio);
|
|
break;
|
|
}
|
|
|
|
if (!folio_trylock(folio)) {
|
|
folio_put(folio);
|
|
break;
|
|
}
|
|
if (!folio_test_dirty(folio) || folio_test_writeback(folio)) {
|
|
folio_unlock(folio);
|
|
folio_put(folio);
|
|
break;
|
|
}
|
|
|
|
max_pages -= nr_pages;
|
|
psize = folio_size(folio);
|
|
len += psize;
|
|
stop = false;
|
|
if (max_pages <= 0 || len >= max_len || *_count <= 0)
|
|
stop = true;
|
|
|
|
index += nr_pages;
|
|
if (!folio_batch_add(&batch, folio))
|
|
break;
|
|
if (stop)
|
|
break;
|
|
}
|
|
|
|
if (!stop)
|
|
xas_pause(&xas);
|
|
rcu_read_unlock();
|
|
|
|
/* Now, if we obtained any pages, we can shift them to being
|
|
* writable and mark them for caching.
|
|
*/
|
|
if (!folio_batch_count(&batch))
|
|
break;
|
|
|
|
for (i = 0; i < folio_batch_count(&batch); i++) {
|
|
folio = batch.folios[i];
|
|
/* The folio should be locked, dirty and not undergoing
|
|
* writeback from the loop above.
|
|
*/
|
|
if (!folio_clear_dirty_for_io(folio))
|
|
WARN_ON(1);
|
|
if (folio_start_writeback(folio))
|
|
WARN_ON(1);
|
|
|
|
*_count -= folio_nr_pages(folio);
|
|
folio_unlock(folio);
|
|
}
|
|
|
|
folio_batch_release(&batch);
|
|
cond_resched();
|
|
} while (!stop);
|
|
|
|
*_len = len;
|
|
}
|
|
|
|
/*
|
|
* Write back the locked page and any subsequent non-locked dirty pages.
|
|
*/
|
|
static ssize_t cifs_write_back_from_locked_folio(struct address_space *mapping,
|
|
struct writeback_control *wbc,
|
|
struct folio *folio,
|
|
loff_t start, loff_t end)
|
|
{
|
|
struct inode *inode = mapping->host;
|
|
struct TCP_Server_Info *server;
|
|
struct cifs_writedata *wdata;
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
|
|
struct cifs_credits credits_on_stack;
|
|
struct cifs_credits *credits = &credits_on_stack;
|
|
struct cifsFileInfo *cfile = NULL;
|
|
unsigned int xid, wsize, len;
|
|
loff_t i_size = i_size_read(inode);
|
|
size_t max_len;
|
|
long count = wbc->nr_to_write;
|
|
int rc;
|
|
|
|
/* The folio should be locked, dirty and not undergoing writeback. */
|
|
if (folio_start_writeback(folio))
|
|
WARN_ON(1);
|
|
|
|
count -= folio_nr_pages(folio);
|
|
len = folio_size(folio);
|
|
|
|
xid = get_xid();
|
|
server = cifs_pick_channel(cifs_sb_master_tcon(cifs_sb)->ses);
|
|
|
|
rc = cifs_get_writable_file(CIFS_I(inode), FIND_WR_ANY, &cfile);
|
|
if (rc) {
|
|
cifs_dbg(VFS, "No writable handle in writepages rc=%d\n", rc);
|
|
goto err_xid;
|
|
}
|
|
|
|
rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->wsize,
|
|
&wsize, credits);
|
|
if (rc != 0)
|
|
goto err_close;
|
|
|
|
wdata = cifs_writedata_alloc(cifs_writev_complete);
|
|
if (!wdata) {
|
|
rc = -ENOMEM;
|
|
goto err_uncredit;
|
|
}
|
|
|
|
wdata->sync_mode = wbc->sync_mode;
|
|
wdata->offset = folio_pos(folio);
|
|
wdata->pid = cfile->pid;
|
|
wdata->credits = credits_on_stack;
|
|
wdata->cfile = cfile;
|
|
wdata->server = server;
|
|
cfile = NULL;
|
|
|
|
/* Find all consecutive lockable dirty pages, stopping when we find a
|
|
* page that is not immediately lockable, is not dirty or is missing,
|
|
* or we reach the end of the range.
|
|
*/
|
|
if (start < i_size) {
|
|
/* Trim the write to the EOF; the extra data is ignored. Also
|
|
* put an upper limit on the size of a single storedata op.
|
|
*/
|
|
max_len = wsize;
|
|
max_len = min_t(unsigned long long, max_len, end - start + 1);
|
|
max_len = min_t(unsigned long long, max_len, i_size - start);
|
|
|
|
if (len < max_len) {
|
|
int max_pages = INT_MAX;
|
|
|
|
#ifdef CONFIG_CIFS_SMB_DIRECT
|
|
if (server->smbd_conn)
|
|
max_pages = server->smbd_conn->max_frmr_depth;
|
|
#endif
|
|
max_pages -= folio_nr_pages(folio);
|
|
|
|
if (max_pages > 0)
|
|
cifs_extend_writeback(mapping, &count, start,
|
|
max_pages, max_len, &len);
|
|
}
|
|
len = min_t(loff_t, len, max_len);
|
|
}
|
|
|
|
wdata->bytes = len;
|
|
|
|
/* We now have a contiguous set of dirty pages, each with writeback
|
|
* set; the first page is still locked at this point, but all the rest
|
|
* have been unlocked.
|
|
*/
|
|
folio_unlock(folio);
|
|
|
|
if (start < i_size) {
|
|
iov_iter_xarray(&wdata->iter, ITER_SOURCE, &mapping->i_pages,
|
|
start, len);
|
|
|
|
rc = adjust_credits(wdata->server, &wdata->credits, wdata->bytes);
|
|
if (rc)
|
|
goto err_wdata;
|
|
|
|
if (wdata->cfile->invalidHandle)
|
|
rc = -EAGAIN;
|
|
else
|
|
rc = wdata->server->ops->async_writev(wdata,
|
|
cifs_writedata_release);
|
|
if (rc >= 0) {
|
|
kref_put(&wdata->refcount, cifs_writedata_release);
|
|
goto err_close;
|
|
}
|
|
} else {
|
|
/* The dirty region was entirely beyond the EOF. */
|
|
cifs_pages_written_back(inode, start, len);
|
|
rc = 0;
|
|
}
|
|
|
|
err_wdata:
|
|
kref_put(&wdata->refcount, cifs_writedata_release);
|
|
err_uncredit:
|
|
add_credits_and_wake_if(server, credits, 0);
|
|
err_close:
|
|
if (cfile)
|
|
cifsFileInfo_put(cfile);
|
|
err_xid:
|
|
free_xid(xid);
|
|
if (rc == 0) {
|
|
wbc->nr_to_write = count;
|
|
rc = len;
|
|
} else if (is_retryable_error(rc)) {
|
|
cifs_pages_write_redirty(inode, start, len);
|
|
} else {
|
|
cifs_pages_write_failed(inode, start, len);
|
|
mapping_set_error(mapping, rc);
|
|
}
|
|
/* Indication to update ctime and mtime as close is deferred */
|
|
set_bit(CIFS_INO_MODIFIED_ATTR, &CIFS_I(inode)->flags);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* write a region of pages back to the server
|
|
*/
|
|
static int cifs_writepages_region(struct address_space *mapping,
|
|
struct writeback_control *wbc,
|
|
loff_t start, loff_t end, loff_t *_next)
|
|
{
|
|
struct folio_batch fbatch;
|
|
int skips = 0;
|
|
|
|
folio_batch_init(&fbatch);
|
|
do {
|
|
int nr;
|
|
pgoff_t index = start / PAGE_SIZE;
|
|
|
|
nr = filemap_get_folios_tag(mapping, &index, end / PAGE_SIZE,
|
|
PAGECACHE_TAG_DIRTY, &fbatch);
|
|
if (!nr)
|
|
break;
|
|
|
|
for (int i = 0; i < nr; i++) {
|
|
ssize_t ret;
|
|
struct folio *folio = fbatch.folios[i];
|
|
|
|
redo_folio:
|
|
start = folio_pos(folio); /* May regress with THPs */
|
|
|
|
/* At this point we hold neither the i_pages lock nor the
|
|
* page lock: the page may be truncated or invalidated
|
|
* (changing page->mapping to NULL), or even swizzled
|
|
* back from swapper_space to tmpfs file mapping
|
|
*/
|
|
if (wbc->sync_mode != WB_SYNC_NONE) {
|
|
ret = folio_lock_killable(folio);
|
|
if (ret < 0)
|
|
goto write_error;
|
|
} else {
|
|
if (!folio_trylock(folio))
|
|
goto skip_write;
|
|
}
|
|
|
|
if (folio_mapping(folio) != mapping ||
|
|
!folio_test_dirty(folio)) {
|
|
start += folio_size(folio);
|
|
folio_unlock(folio);
|
|
continue;
|
|
}
|
|
|
|
if (folio_test_writeback(folio) ||
|
|
folio_test_fscache(folio)) {
|
|
folio_unlock(folio);
|
|
if (wbc->sync_mode == WB_SYNC_NONE)
|
|
goto skip_write;
|
|
|
|
folio_wait_writeback(folio);
|
|
#ifdef CONFIG_CIFS_FSCACHE
|
|
folio_wait_fscache(folio);
|
|
#endif
|
|
goto redo_folio;
|
|
}
|
|
|
|
if (!folio_clear_dirty_for_io(folio))
|
|
/* We hold the page lock - it should've been dirty. */
|
|
WARN_ON(1);
|
|
|
|
ret = cifs_write_back_from_locked_folio(mapping, wbc, folio, start, end);
|
|
if (ret < 0)
|
|
goto write_error;
|
|
|
|
start += ret;
|
|
continue;
|
|
|
|
write_error:
|
|
folio_batch_release(&fbatch);
|
|
*_next = start;
|
|
return ret;
|
|
|
|
skip_write:
|
|
/*
|
|
* Too many skipped writes, or need to reschedule?
|
|
* Treat it as a write error without an error code.
|
|
*/
|
|
if (skips >= 5 || need_resched()) {
|
|
ret = 0;
|
|
goto write_error;
|
|
}
|
|
|
|
/* Otherwise, just skip that folio and go on to the next */
|
|
skips++;
|
|
start += folio_size(folio);
|
|
continue;
|
|
}
|
|
|
|
folio_batch_release(&fbatch);
|
|
cond_resched();
|
|
} while (wbc->nr_to_write > 0);
|
|
|
|
*_next = start;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Write some of the pending data back to the server
|
|
*/
|
|
static int cifs_writepages(struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
loff_t start, next;
|
|
int ret;
|
|
|
|
/* We have to be careful as we can end up racing with setattr()
|
|
* truncating the pagecache since the caller doesn't take a lock here
|
|
* to prevent it.
|
|
*/
|
|
|
|
if (wbc->range_cyclic) {
|
|
start = mapping->writeback_index * PAGE_SIZE;
|
|
ret = cifs_writepages_region(mapping, wbc, start, LLONG_MAX, &next);
|
|
if (ret == 0) {
|
|
mapping->writeback_index = next / PAGE_SIZE;
|
|
if (start > 0 && wbc->nr_to_write > 0) {
|
|
ret = cifs_writepages_region(mapping, wbc, 0,
|
|
start, &next);
|
|
if (ret == 0)
|
|
mapping->writeback_index =
|
|
next / PAGE_SIZE;
|
|
}
|
|
}
|
|
} else if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) {
|
|
ret = cifs_writepages_region(mapping, wbc, 0, LLONG_MAX, &next);
|
|
if (wbc->nr_to_write > 0 && ret == 0)
|
|
mapping->writeback_index = next / PAGE_SIZE;
|
|
} else {
|
|
ret = cifs_writepages_region(mapping, wbc,
|
|
wbc->range_start, wbc->range_end, &next);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
cifs_writepage_locked(struct page *page, struct writeback_control *wbc)
|
|
{
|
|
int rc;
|
|
unsigned int xid;
|
|
|
|
xid = get_xid();
|
|
/* BB add check for wbc flags */
|
|
get_page(page);
|
|
if (!PageUptodate(page))
|
|
cifs_dbg(FYI, "ppw - page not up to date\n");
|
|
|
|
/*
|
|
* Set the "writeback" flag, and clear "dirty" in the radix tree.
|
|
*
|
|
* A writepage() implementation always needs to do either this,
|
|
* or re-dirty the page with "redirty_page_for_writepage()" in
|
|
* the case of a failure.
|
|
*
|
|
* Just unlocking the page will cause the radix tree tag-bits
|
|
* to fail to update with the state of the page correctly.
|
|
*/
|
|
set_page_writeback(page);
|
|
retry_write:
|
|
rc = cifs_partialpagewrite(page, 0, PAGE_SIZE);
|
|
if (is_retryable_error(rc)) {
|
|
if (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN)
|
|
goto retry_write;
|
|
redirty_page_for_writepage(wbc, page);
|
|
} else if (rc != 0) {
|
|
SetPageError(page);
|
|
mapping_set_error(page->mapping, rc);
|
|
} else {
|
|
SetPageUptodate(page);
|
|
}
|
|
end_page_writeback(page);
|
|
put_page(page);
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
|
|
static int cifs_write_end(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned copied,
|
|
struct page *page, void *fsdata)
|
|
{
|
|
int rc;
|
|
struct inode *inode = mapping->host;
|
|
struct cifsFileInfo *cfile = file->private_data;
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
|
|
struct folio *folio = page_folio(page);
|
|
__u32 pid;
|
|
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
|
|
pid = cfile->pid;
|
|
else
|
|
pid = current->tgid;
|
|
|
|
cifs_dbg(FYI, "write_end for page %p from pos %lld with %d bytes\n",
|
|
page, pos, copied);
|
|
|
|
if (folio_test_checked(folio)) {
|
|
if (copied == len)
|
|
folio_mark_uptodate(folio);
|
|
folio_clear_checked(folio);
|
|
} else if (!folio_test_uptodate(folio) && copied == PAGE_SIZE)
|
|
folio_mark_uptodate(folio);
|
|
|
|
if (!folio_test_uptodate(folio)) {
|
|
char *page_data;
|
|
unsigned offset = pos & (PAGE_SIZE - 1);
|
|
unsigned int xid;
|
|
|
|
xid = get_xid();
|
|
/* this is probably better than directly calling
|
|
partialpage_write since in this function the file handle is
|
|
known which we might as well leverage */
|
|
/* BB check if anything else missing out of ppw
|
|
such as updating last write time */
|
|
page_data = kmap(page);
|
|
rc = cifs_write(cfile, pid, page_data + offset, copied, &pos);
|
|
/* if (rc < 0) should we set writebehind rc? */
|
|
kunmap(page);
|
|
|
|
free_xid(xid);
|
|
} else {
|
|
rc = copied;
|
|
pos += copied;
|
|
set_page_dirty(page);
|
|
}
|
|
|
|
if (rc > 0) {
|
|
spin_lock(&inode->i_lock);
|
|
if (pos > inode->i_size) {
|
|
i_size_write(inode, pos);
|
|
inode->i_blocks = (512 - 1 + pos) >> 9;
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
unlock_page(page);
|
|
put_page(page);
|
|
/* Indication to update ctime and mtime as close is deferred */
|
|
set_bit(CIFS_INO_MODIFIED_ATTR, &CIFS_I(inode)->flags);
|
|
|
|
return rc;
|
|
}
|
|
|
|
int cifs_strict_fsync(struct file *file, loff_t start, loff_t end,
|
|
int datasync)
|
|
{
|
|
unsigned int xid;
|
|
int rc = 0;
|
|
struct cifs_tcon *tcon;
|
|
struct TCP_Server_Info *server;
|
|
struct cifsFileInfo *smbfile = file->private_data;
|
|
struct inode *inode = file_inode(file);
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
|
|
|
|
rc = file_write_and_wait_range(file, start, end);
|
|
if (rc) {
|
|
trace_cifs_fsync_err(inode->i_ino, rc);
|
|
return rc;
|
|
}
|
|
|
|
xid = get_xid();
|
|
|
|
cifs_dbg(FYI, "Sync file - name: %pD datasync: 0x%x\n",
|
|
file, datasync);
|
|
|
|
if (!CIFS_CACHE_READ(CIFS_I(inode))) {
|
|
rc = cifs_zap_mapping(inode);
|
|
if (rc) {
|
|
cifs_dbg(FYI, "rc: %d during invalidate phase\n", rc);
|
|
rc = 0; /* don't care about it in fsync */
|
|
}
|
|
}
|
|
|
|
tcon = tlink_tcon(smbfile->tlink);
|
|
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) {
|
|
server = tcon->ses->server;
|
|
if (server->ops->flush == NULL) {
|
|
rc = -ENOSYS;
|
|
goto strict_fsync_exit;
|
|
}
|
|
|
|
if ((OPEN_FMODE(smbfile->f_flags) & FMODE_WRITE) == 0) {
|
|
smbfile = find_writable_file(CIFS_I(inode), FIND_WR_ANY);
|
|
if (smbfile) {
|
|
rc = server->ops->flush(xid, tcon, &smbfile->fid);
|
|
cifsFileInfo_put(smbfile);
|
|
} else
|
|
cifs_dbg(FYI, "ignore fsync for file not open for write\n");
|
|
} else
|
|
rc = server->ops->flush(xid, tcon, &smbfile->fid);
|
|
}
|
|
|
|
strict_fsync_exit:
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
|
|
int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
|
|
{
|
|
unsigned int xid;
|
|
int rc = 0;
|
|
struct cifs_tcon *tcon;
|
|
struct TCP_Server_Info *server;
|
|
struct cifsFileInfo *smbfile = file->private_data;
|
|
struct inode *inode = file_inode(file);
|
|
struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
|
|
|
|
rc = file_write_and_wait_range(file, start, end);
|
|
if (rc) {
|
|
trace_cifs_fsync_err(file_inode(file)->i_ino, rc);
|
|
return rc;
|
|
}
|
|
|
|
xid = get_xid();
|
|
|
|
cifs_dbg(FYI, "Sync file - name: %pD datasync: 0x%x\n",
|
|
file, datasync);
|
|
|
|
tcon = tlink_tcon(smbfile->tlink);
|
|
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) {
|
|
server = tcon->ses->server;
|
|
if (server->ops->flush == NULL) {
|
|
rc = -ENOSYS;
|
|
goto fsync_exit;
|
|
}
|
|
|
|
if ((OPEN_FMODE(smbfile->f_flags) & FMODE_WRITE) == 0) {
|
|
smbfile = find_writable_file(CIFS_I(inode), FIND_WR_ANY);
|
|
if (smbfile) {
|
|
rc = server->ops->flush(xid, tcon, &smbfile->fid);
|
|
cifsFileInfo_put(smbfile);
|
|
} else
|
|
cifs_dbg(FYI, "ignore fsync for file not open for write\n");
|
|
} else
|
|
rc = server->ops->flush(xid, tcon, &smbfile->fid);
|
|
}
|
|
|
|
fsync_exit:
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* As file closes, flush all cached write data for this inode checking
|
|
* for write behind errors.
|
|
*/
|
|
int cifs_flush(struct file *file, fl_owner_t id)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
int rc = 0;
|
|
|
|
if (file->f_mode & FMODE_WRITE)
|
|
rc = filemap_write_and_wait(inode->i_mapping);
|
|
|
|
cifs_dbg(FYI, "Flush inode %p file %p rc %d\n", inode, file, rc);
|
|
if (rc) {
|
|
/* get more nuanced writeback errors */
|
|
rc = filemap_check_wb_err(file->f_mapping, 0);
|
|
trace_cifs_flush_err(inode->i_ino, rc);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static void
|
|
cifs_uncached_writedata_release(struct kref *refcount)
|
|
{
|
|
struct cifs_writedata *wdata = container_of(refcount,
|
|
struct cifs_writedata, refcount);
|
|
|
|
kref_put(&wdata->ctx->refcount, cifs_aio_ctx_release);
|
|
cifs_writedata_release(refcount);
|
|
}
|
|
|
|
static void collect_uncached_write_data(struct cifs_aio_ctx *ctx);
|
|
|
|
static void
|
|
cifs_uncached_writev_complete(struct work_struct *work)
|
|
{
|
|
struct cifs_writedata *wdata = container_of(work,
|
|
struct cifs_writedata, work);
|
|
struct inode *inode = d_inode(wdata->cfile->dentry);
|
|
struct cifsInodeInfo *cifsi = CIFS_I(inode);
|
|
|
|
spin_lock(&inode->i_lock);
|
|
cifs_update_eof(cifsi, wdata->offset, wdata->bytes);
|
|
if (cifsi->server_eof > inode->i_size)
|
|
i_size_write(inode, cifsi->server_eof);
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
complete(&wdata->done);
|
|
collect_uncached_write_data(wdata->ctx);
|
|
/* the below call can possibly free the last ref to aio ctx */
|
|
kref_put(&wdata->refcount, cifs_uncached_writedata_release);
|
|
}
|
|
|
|
static int
|
|
cifs_resend_wdata(struct cifs_writedata *wdata, struct list_head *wdata_list,
|
|
struct cifs_aio_ctx *ctx)
|
|
{
|
|
unsigned int wsize;
|
|
struct cifs_credits credits;
|
|
int rc;
|
|
struct TCP_Server_Info *server = wdata->server;
|
|
|
|
do {
|
|
if (wdata->cfile->invalidHandle) {
|
|
rc = cifs_reopen_file(wdata->cfile, false);
|
|
if (rc == -EAGAIN)
|
|
continue;
|
|
else if (rc)
|
|
break;
|
|
}
|
|
|
|
|
|
/*
|
|
* Wait for credits to resend this wdata.
|
|
* Note: we are attempting to resend the whole wdata not in
|
|
* segments
|
|
*/
|
|
do {
|
|
rc = server->ops->wait_mtu_credits(server, wdata->bytes,
|
|
&wsize, &credits);
|
|
if (rc)
|
|
goto fail;
|
|
|
|
if (wsize < wdata->bytes) {
|
|
add_credits_and_wake_if(server, &credits, 0);
|
|
msleep(1000);
|
|
}
|
|
} while (wsize < wdata->bytes);
|
|
wdata->credits = credits;
|
|
|
|
rc = adjust_credits(server, &wdata->credits, wdata->bytes);
|
|
|
|
if (!rc) {
|
|
if (wdata->cfile->invalidHandle)
|
|
rc = -EAGAIN;
|
|
else {
|
|
#ifdef CONFIG_CIFS_SMB_DIRECT
|
|
if (wdata->mr) {
|
|
wdata->mr->need_invalidate = true;
|
|
smbd_deregister_mr(wdata->mr);
|
|
wdata->mr = NULL;
|
|
}
|
|
#endif
|
|
rc = server->ops->async_writev(wdata,
|
|
cifs_uncached_writedata_release);
|
|
}
|
|
}
|
|
|
|
/* If the write was successfully sent, we are done */
|
|
if (!rc) {
|
|
list_add_tail(&wdata->list, wdata_list);
|
|
return 0;
|
|
}
|
|
|
|
/* Roll back credits and retry if needed */
|
|
add_credits_and_wake_if(server, &wdata->credits, 0);
|
|
} while (rc == -EAGAIN);
|
|
|
|
fail:
|
|
kref_put(&wdata->refcount, cifs_uncached_writedata_release);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Select span of a bvec iterator we're going to use. Limit it by both maximum
|
|
* size and maximum number of segments.
|
|
*/
|
|
static size_t cifs_limit_bvec_subset(const struct iov_iter *iter, size_t max_size,
|
|
size_t max_segs, unsigned int *_nsegs)
|
|
{
|
|
const struct bio_vec *bvecs = iter->bvec;
|
|
unsigned int nbv = iter->nr_segs, ix = 0, nsegs = 0;
|
|
size_t len, span = 0, n = iter->count;
|
|
size_t skip = iter->iov_offset;
|
|
|
|
if (WARN_ON(!iov_iter_is_bvec(iter)) || n == 0)
|
|
return 0;
|
|
|
|
while (n && ix < nbv && skip) {
|
|
len = bvecs[ix].bv_len;
|
|
if (skip < len)
|
|
break;
|
|
skip -= len;
|
|
n -= len;
|
|
ix++;
|
|
}
|
|
|
|
while (n && ix < nbv) {
|
|
len = min3(n, bvecs[ix].bv_len - skip, max_size);
|
|
span += len;
|
|
nsegs++;
|
|
ix++;
|
|
if (span >= max_size || nsegs >= max_segs)
|
|
break;
|
|
skip = 0;
|
|
n -= len;
|
|
}
|
|
|
|
*_nsegs = nsegs;
|
|
return span;
|
|
}
|
|
|
|
static int
|
|
cifs_write_from_iter(loff_t fpos, size_t len, struct iov_iter *from,
|
|
struct cifsFileInfo *open_file,
|
|
struct cifs_sb_info *cifs_sb, struct list_head *wdata_list,
|
|
struct cifs_aio_ctx *ctx)
|
|
{
|
|
int rc = 0;
|
|
size_t cur_len, max_len;
|
|
struct cifs_writedata *wdata;
|
|
pid_t pid;
|
|
struct TCP_Server_Info *server;
|
|
unsigned int xid, max_segs = INT_MAX;
|
|
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
|
|
pid = open_file->pid;
|
|
else
|
|
pid = current->tgid;
|
|
|
|
server = cifs_pick_channel(tlink_tcon(open_file->tlink)->ses);
|
|
xid = get_xid();
|
|
|
|
#ifdef CONFIG_CIFS_SMB_DIRECT
|
|
if (server->smbd_conn)
|
|
max_segs = server->smbd_conn->max_frmr_depth;
|
|
#endif
|
|
|
|
do {
|
|
struct cifs_credits credits_on_stack;
|
|
struct cifs_credits *credits = &credits_on_stack;
|
|
unsigned int wsize, nsegs = 0;
|
|
|
|
if (signal_pending(current)) {
|
|
rc = -EINTR;
|
|
break;
|
|
}
|
|
|
|
if (open_file->invalidHandle) {
|
|
rc = cifs_reopen_file(open_file, false);
|
|
if (rc == -EAGAIN)
|
|
continue;
|
|
else if (rc)
|
|
break;
|
|
}
|
|
|
|
rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->wsize,
|
|
&wsize, credits);
|
|
if (rc)
|
|
break;
|
|
|
|
max_len = min_t(const size_t, len, wsize);
|
|
if (!max_len) {
|
|
rc = -EAGAIN;
|
|
add_credits_and_wake_if(server, credits, 0);
|
|
break;
|
|
}
|
|
|
|
cur_len = cifs_limit_bvec_subset(from, max_len, max_segs, &nsegs);
|
|
cifs_dbg(FYI, "write_from_iter len=%zx/%zx nsegs=%u/%lu/%u\n",
|
|
cur_len, max_len, nsegs, from->nr_segs, max_segs);
|
|
if (cur_len == 0) {
|
|
rc = -EIO;
|
|
add_credits_and_wake_if(server, credits, 0);
|
|
break;
|
|
}
|
|
|
|
wdata = cifs_writedata_alloc(cifs_uncached_writev_complete);
|
|
if (!wdata) {
|
|
rc = -ENOMEM;
|
|
add_credits_and_wake_if(server, credits, 0);
|
|
break;
|
|
}
|
|
|
|
wdata->sync_mode = WB_SYNC_ALL;
|
|
wdata->offset = (__u64)fpos;
|
|
wdata->cfile = cifsFileInfo_get(open_file);
|
|
wdata->server = server;
|
|
wdata->pid = pid;
|
|
wdata->bytes = cur_len;
|
|
wdata->credits = credits_on_stack;
|
|
wdata->iter = *from;
|
|
wdata->ctx = ctx;
|
|
kref_get(&ctx->refcount);
|
|
|
|
iov_iter_truncate(&wdata->iter, cur_len);
|
|
|
|
rc = adjust_credits(server, &wdata->credits, wdata->bytes);
|
|
|
|
if (!rc) {
|
|
if (wdata->cfile->invalidHandle)
|
|
rc = -EAGAIN;
|
|
else
|
|
rc = server->ops->async_writev(wdata,
|
|
cifs_uncached_writedata_release);
|
|
}
|
|
|
|
if (rc) {
|
|
add_credits_and_wake_if(server, &wdata->credits, 0);
|
|
kref_put(&wdata->refcount,
|
|
cifs_uncached_writedata_release);
|
|
if (rc == -EAGAIN)
|
|
continue;
|
|
break;
|
|
}
|
|
|
|
list_add_tail(&wdata->list, wdata_list);
|
|
iov_iter_advance(from, cur_len);
|
|
fpos += cur_len;
|
|
len -= cur_len;
|
|
} while (len > 0);
|
|
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
|
|
static void collect_uncached_write_data(struct cifs_aio_ctx *ctx)
|
|
{
|
|
struct cifs_writedata *wdata, *tmp;
|
|
struct cifs_tcon *tcon;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct dentry *dentry = ctx->cfile->dentry;
|
|
ssize_t rc;
|
|
|
|
tcon = tlink_tcon(ctx->cfile->tlink);
|
|
cifs_sb = CIFS_SB(dentry->d_sb);
|
|
|
|
mutex_lock(&ctx->aio_mutex);
|
|
|
|
if (list_empty(&ctx->list)) {
|
|
mutex_unlock(&ctx->aio_mutex);
|
|
return;
|
|
}
|
|
|
|
rc = ctx->rc;
|
|
/*
|
|
* Wait for and collect replies for any successful sends in order of
|
|
* increasing offset. Once an error is hit, then return without waiting
|
|
* for any more replies.
|
|
*/
|
|
restart_loop:
|
|
list_for_each_entry_safe(wdata, tmp, &ctx->list, list) {
|
|
if (!rc) {
|
|
if (!try_wait_for_completion(&wdata->done)) {
|
|
mutex_unlock(&ctx->aio_mutex);
|
|
return;
|
|
}
|
|
|
|
if (wdata->result)
|
|
rc = wdata->result;
|
|
else
|
|
ctx->total_len += wdata->bytes;
|
|
|
|
/* resend call if it's a retryable error */
|
|
if (rc == -EAGAIN) {
|
|
struct list_head tmp_list;
|
|
struct iov_iter tmp_from = ctx->iter;
|
|
|
|
INIT_LIST_HEAD(&tmp_list);
|
|
list_del_init(&wdata->list);
|
|
|
|
if (ctx->direct_io)
|
|
rc = cifs_resend_wdata(
|
|
wdata, &tmp_list, ctx);
|
|
else {
|
|
iov_iter_advance(&tmp_from,
|
|
wdata->offset - ctx->pos);
|
|
|
|
rc = cifs_write_from_iter(wdata->offset,
|
|
wdata->bytes, &tmp_from,
|
|
ctx->cfile, cifs_sb, &tmp_list,
|
|
ctx);
|
|
|
|
kref_put(&wdata->refcount,
|
|
cifs_uncached_writedata_release);
|
|
}
|
|
|
|
list_splice(&tmp_list, &ctx->list);
|
|
goto restart_loop;
|
|
}
|
|
}
|
|
list_del_init(&wdata->list);
|
|
kref_put(&wdata->refcount, cifs_uncached_writedata_release);
|
|
}
|
|
|
|
cifs_stats_bytes_written(tcon, ctx->total_len);
|
|
set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(dentry->d_inode)->flags);
|
|
|
|
ctx->rc = (rc == 0) ? ctx->total_len : rc;
|
|
|
|
mutex_unlock(&ctx->aio_mutex);
|
|
|
|
if (ctx->iocb && ctx->iocb->ki_complete)
|
|
ctx->iocb->ki_complete(ctx->iocb, ctx->rc);
|
|
else
|
|
complete(&ctx->done);
|
|
}
|
|
|
|
static ssize_t __cifs_writev(
|
|
struct kiocb *iocb, struct iov_iter *from, bool direct)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
ssize_t total_written = 0;
|
|
struct cifsFileInfo *cfile;
|
|
struct cifs_tcon *tcon;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifs_aio_ctx *ctx;
|
|
int rc;
|
|
|
|
rc = generic_write_checks(iocb, from);
|
|
if (rc <= 0)
|
|
return rc;
|
|
|
|
cifs_sb = CIFS_FILE_SB(file);
|
|
cfile = file->private_data;
|
|
tcon = tlink_tcon(cfile->tlink);
|
|
|
|
if (!tcon->ses->server->ops->async_writev)
|
|
return -ENOSYS;
|
|
|
|
ctx = cifs_aio_ctx_alloc();
|
|
if (!ctx)
|
|
return -ENOMEM;
|
|
|
|
ctx->cfile = cifsFileInfo_get(cfile);
|
|
|
|
if (!is_sync_kiocb(iocb))
|
|
ctx->iocb = iocb;
|
|
|
|
ctx->pos = iocb->ki_pos;
|
|
ctx->direct_io = direct;
|
|
ctx->nr_pinned_pages = 0;
|
|
|
|
if (user_backed_iter(from)) {
|
|
/*
|
|
* Extract IOVEC/UBUF-type iterators to a BVEC-type iterator as
|
|
* they contain references to the calling process's virtual
|
|
* memory layout which won't be available in an async worker
|
|
* thread. This also takes a pin on every folio involved.
|
|
*/
|
|
rc = netfs_extract_user_iter(from, iov_iter_count(from),
|
|
&ctx->iter, 0);
|
|
if (rc < 0) {
|
|
kref_put(&ctx->refcount, cifs_aio_ctx_release);
|
|
return rc;
|
|
}
|
|
|
|
ctx->nr_pinned_pages = rc;
|
|
ctx->bv = (void *)ctx->iter.bvec;
|
|
ctx->bv_need_unpin = iov_iter_extract_will_pin(from);
|
|
} else if ((iov_iter_is_bvec(from) || iov_iter_is_kvec(from)) &&
|
|
!is_sync_kiocb(iocb)) {
|
|
/*
|
|
* If the op is asynchronous, we need to copy the list attached
|
|
* to a BVEC/KVEC-type iterator, but we assume that the storage
|
|
* will be pinned by the caller; in any case, we may or may not
|
|
* be able to pin the pages, so we don't try.
|
|
*/
|
|
ctx->bv = (void *)dup_iter(&ctx->iter, from, GFP_KERNEL);
|
|
if (!ctx->bv) {
|
|
kref_put(&ctx->refcount, cifs_aio_ctx_release);
|
|
return -ENOMEM;
|
|
}
|
|
} else {
|
|
/*
|
|
* Otherwise, we just pass the iterator down as-is and rely on
|
|
* the caller to make sure the pages referred to by the
|
|
* iterator don't evaporate.
|
|
*/
|
|
ctx->iter = *from;
|
|
}
|
|
|
|
ctx->len = iov_iter_count(&ctx->iter);
|
|
|
|
/* grab a lock here due to read response handlers can access ctx */
|
|
mutex_lock(&ctx->aio_mutex);
|
|
|
|
rc = cifs_write_from_iter(iocb->ki_pos, ctx->len, &ctx->iter,
|
|
cfile, cifs_sb, &ctx->list, ctx);
|
|
|
|
/*
|
|
* If at least one write was successfully sent, then discard any rc
|
|
* value from the later writes. If the other write succeeds, then
|
|
* we'll end up returning whatever was written. If it fails, then
|
|
* we'll get a new rc value from that.
|
|
*/
|
|
if (!list_empty(&ctx->list))
|
|
rc = 0;
|
|
|
|
mutex_unlock(&ctx->aio_mutex);
|
|
|
|
if (rc) {
|
|
kref_put(&ctx->refcount, cifs_aio_ctx_release);
|
|
return rc;
|
|
}
|
|
|
|
if (!is_sync_kiocb(iocb)) {
|
|
kref_put(&ctx->refcount, cifs_aio_ctx_release);
|
|
return -EIOCBQUEUED;
|
|
}
|
|
|
|
rc = wait_for_completion_killable(&ctx->done);
|
|
if (rc) {
|
|
mutex_lock(&ctx->aio_mutex);
|
|
ctx->rc = rc = -EINTR;
|
|
total_written = ctx->total_len;
|
|
mutex_unlock(&ctx->aio_mutex);
|
|
} else {
|
|
rc = ctx->rc;
|
|
total_written = ctx->total_len;
|
|
}
|
|
|
|
kref_put(&ctx->refcount, cifs_aio_ctx_release);
|
|
|
|
if (unlikely(!total_written))
|
|
return rc;
|
|
|
|
iocb->ki_pos += total_written;
|
|
return total_written;
|
|
}
|
|
|
|
ssize_t cifs_direct_writev(struct kiocb *iocb, struct iov_iter *from)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
|
|
cifs_revalidate_mapping(file->f_inode);
|
|
return __cifs_writev(iocb, from, true);
|
|
}
|
|
|
|
ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from)
|
|
{
|
|
return __cifs_writev(iocb, from, false);
|
|
}
|
|
|
|
static ssize_t
|
|
cifs_writev(struct kiocb *iocb, struct iov_iter *from)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
|
|
struct inode *inode = file->f_mapping->host;
|
|
struct cifsInodeInfo *cinode = CIFS_I(inode);
|
|
struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
|
|
ssize_t rc;
|
|
|
|
inode_lock(inode);
|
|
/*
|
|
* We need to hold the sem to be sure nobody modifies lock list
|
|
* with a brlock that prevents writing.
|
|
*/
|
|
down_read(&cinode->lock_sem);
|
|
|
|
rc = generic_write_checks(iocb, from);
|
|
if (rc <= 0)
|
|
goto out;
|
|
|
|
if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(from),
|
|
server->vals->exclusive_lock_type, 0,
|
|
NULL, CIFS_WRITE_OP))
|
|
rc = __generic_file_write_iter(iocb, from);
|
|
else
|
|
rc = -EACCES;
|
|
out:
|
|
up_read(&cinode->lock_sem);
|
|
inode_unlock(inode);
|
|
|
|
if (rc > 0)
|
|
rc = generic_write_sync(iocb, rc);
|
|
return rc;
|
|
}
|
|
|
|
ssize_t
|
|
cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from)
|
|
{
|
|
struct inode *inode = file_inode(iocb->ki_filp);
|
|
struct cifsInodeInfo *cinode = CIFS_I(inode);
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
|
|
struct cifsFileInfo *cfile = (struct cifsFileInfo *)
|
|
iocb->ki_filp->private_data;
|
|
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
|
|
ssize_t written;
|
|
|
|
written = cifs_get_writer(cinode);
|
|
if (written)
|
|
return written;
|
|
|
|
if (CIFS_CACHE_WRITE(cinode)) {
|
|
if (cap_unix(tcon->ses) &&
|
|
(CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability))
|
|
&& ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) {
|
|
written = generic_file_write_iter(iocb, from);
|
|
goto out;
|
|
}
|
|
written = cifs_writev(iocb, from);
|
|
goto out;
|
|
}
|
|
/*
|
|
* For non-oplocked files in strict cache mode we need to write the data
|
|
* to the server exactly from the pos to pos+len-1 rather than flush all
|
|
* affected pages because it may cause a error with mandatory locks on
|
|
* these pages but not on the region from pos to ppos+len-1.
|
|
*/
|
|
written = cifs_user_writev(iocb, from);
|
|
if (CIFS_CACHE_READ(cinode)) {
|
|
/*
|
|
* We have read level caching and we have just sent a write
|
|
* request to the server thus making data in the cache stale.
|
|
* Zap the cache and set oplock/lease level to NONE to avoid
|
|
* reading stale data from the cache. All subsequent read
|
|
* operations will read new data from the server.
|
|
*/
|
|
cifs_zap_mapping(inode);
|
|
cifs_dbg(FYI, "Set Oplock/Lease to NONE for inode=%p after write\n",
|
|
inode);
|
|
cinode->oplock = 0;
|
|
}
|
|
out:
|
|
cifs_put_writer(cinode);
|
|
return written;
|
|
}
|
|
|
|
static struct cifs_readdata *cifs_readdata_alloc(work_func_t complete)
|
|
{
|
|
struct cifs_readdata *rdata;
|
|
|
|
rdata = kzalloc(sizeof(*rdata), GFP_KERNEL);
|
|
if (rdata) {
|
|
kref_init(&rdata->refcount);
|
|
INIT_LIST_HEAD(&rdata->list);
|
|
init_completion(&rdata->done);
|
|
INIT_WORK(&rdata->work, complete);
|
|
}
|
|
|
|
return rdata;
|
|
}
|
|
|
|
void
|
|
cifs_readdata_release(struct kref *refcount)
|
|
{
|
|
struct cifs_readdata *rdata = container_of(refcount,
|
|
struct cifs_readdata, refcount);
|
|
|
|
if (rdata->ctx)
|
|
kref_put(&rdata->ctx->refcount, cifs_aio_ctx_release);
|
|
#ifdef CONFIG_CIFS_SMB_DIRECT
|
|
if (rdata->mr) {
|
|
smbd_deregister_mr(rdata->mr);
|
|
rdata->mr = NULL;
|
|
}
|
|
#endif
|
|
if (rdata->cfile)
|
|
cifsFileInfo_put(rdata->cfile);
|
|
|
|
kfree(rdata);
|
|
}
|
|
|
|
static void collect_uncached_read_data(struct cifs_aio_ctx *ctx);
|
|
|
|
static void
|
|
cifs_uncached_readv_complete(struct work_struct *work)
|
|
{
|
|
struct cifs_readdata *rdata = container_of(work,
|
|
struct cifs_readdata, work);
|
|
|
|
complete(&rdata->done);
|
|
collect_uncached_read_data(rdata->ctx);
|
|
/* the below call can possibly free the last ref to aio ctx */
|
|
kref_put(&rdata->refcount, cifs_readdata_release);
|
|
}
|
|
|
|
static int cifs_resend_rdata(struct cifs_readdata *rdata,
|
|
struct list_head *rdata_list,
|
|
struct cifs_aio_ctx *ctx)
|
|
{
|
|
unsigned int rsize;
|
|
struct cifs_credits credits;
|
|
int rc;
|
|
struct TCP_Server_Info *server;
|
|
|
|
/* XXX: should we pick a new channel here? */
|
|
server = rdata->server;
|
|
|
|
do {
|
|
if (rdata->cfile->invalidHandle) {
|
|
rc = cifs_reopen_file(rdata->cfile, true);
|
|
if (rc == -EAGAIN)
|
|
continue;
|
|
else if (rc)
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Wait for credits to resend this rdata.
|
|
* Note: we are attempting to resend the whole rdata not in
|
|
* segments
|
|
*/
|
|
do {
|
|
rc = server->ops->wait_mtu_credits(server, rdata->bytes,
|
|
&rsize, &credits);
|
|
|
|
if (rc)
|
|
goto fail;
|
|
|
|
if (rsize < rdata->bytes) {
|
|
add_credits_and_wake_if(server, &credits, 0);
|
|
msleep(1000);
|
|
}
|
|
} while (rsize < rdata->bytes);
|
|
rdata->credits = credits;
|
|
|
|
rc = adjust_credits(server, &rdata->credits, rdata->bytes);
|
|
if (!rc) {
|
|
if (rdata->cfile->invalidHandle)
|
|
rc = -EAGAIN;
|
|
else {
|
|
#ifdef CONFIG_CIFS_SMB_DIRECT
|
|
if (rdata->mr) {
|
|
rdata->mr->need_invalidate = true;
|
|
smbd_deregister_mr(rdata->mr);
|
|
rdata->mr = NULL;
|
|
}
|
|
#endif
|
|
rc = server->ops->async_readv(rdata);
|
|
}
|
|
}
|
|
|
|
/* If the read was successfully sent, we are done */
|
|
if (!rc) {
|
|
/* Add to aio pending list */
|
|
list_add_tail(&rdata->list, rdata_list);
|
|
return 0;
|
|
}
|
|
|
|
/* Roll back credits and retry if needed */
|
|
add_credits_and_wake_if(server, &rdata->credits, 0);
|
|
} while (rc == -EAGAIN);
|
|
|
|
fail:
|
|
kref_put(&rdata->refcount, cifs_readdata_release);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
cifs_send_async_read(loff_t fpos, size_t len, struct cifsFileInfo *open_file,
|
|
struct cifs_sb_info *cifs_sb, struct list_head *rdata_list,
|
|
struct cifs_aio_ctx *ctx)
|
|
{
|
|
struct cifs_readdata *rdata;
|
|
unsigned int rsize, nsegs, max_segs = INT_MAX;
|
|
struct cifs_credits credits_on_stack;
|
|
struct cifs_credits *credits = &credits_on_stack;
|
|
size_t cur_len, max_len;
|
|
int rc;
|
|
pid_t pid;
|
|
struct TCP_Server_Info *server;
|
|
|
|
server = cifs_pick_channel(tlink_tcon(open_file->tlink)->ses);
|
|
|
|
#ifdef CONFIG_CIFS_SMB_DIRECT
|
|
if (server->smbd_conn)
|
|
max_segs = server->smbd_conn->max_frmr_depth;
|
|
#endif
|
|
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
|
|
pid = open_file->pid;
|
|
else
|
|
pid = current->tgid;
|
|
|
|
do {
|
|
if (open_file->invalidHandle) {
|
|
rc = cifs_reopen_file(open_file, true);
|
|
if (rc == -EAGAIN)
|
|
continue;
|
|
else if (rc)
|
|
break;
|
|
}
|
|
|
|
if (cifs_sb->ctx->rsize == 0)
|
|
cifs_sb->ctx->rsize =
|
|
server->ops->negotiate_rsize(tlink_tcon(open_file->tlink),
|
|
cifs_sb->ctx);
|
|
|
|
rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize,
|
|
&rsize, credits);
|
|
if (rc)
|
|
break;
|
|
|
|
max_len = min_t(size_t, len, rsize);
|
|
|
|
cur_len = cifs_limit_bvec_subset(&ctx->iter, max_len,
|
|
max_segs, &nsegs);
|
|
cifs_dbg(FYI, "read-to-iter len=%zx/%zx nsegs=%u/%lu/%u\n",
|
|
cur_len, max_len, nsegs, ctx->iter.nr_segs, max_segs);
|
|
if (cur_len == 0) {
|
|
rc = -EIO;
|
|
add_credits_and_wake_if(server, credits, 0);
|
|
break;
|
|
}
|
|
|
|
rdata = cifs_readdata_alloc(cifs_uncached_readv_complete);
|
|
if (!rdata) {
|
|
add_credits_and_wake_if(server, credits, 0);
|
|
rc = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
rdata->server = server;
|
|
rdata->cfile = cifsFileInfo_get(open_file);
|
|
rdata->offset = fpos;
|
|
rdata->bytes = cur_len;
|
|
rdata->pid = pid;
|
|
rdata->credits = credits_on_stack;
|
|
rdata->ctx = ctx;
|
|
kref_get(&ctx->refcount);
|
|
|
|
rdata->iter = ctx->iter;
|
|
iov_iter_truncate(&rdata->iter, cur_len);
|
|
|
|
rc = adjust_credits(server, &rdata->credits, rdata->bytes);
|
|
|
|
if (!rc) {
|
|
if (rdata->cfile->invalidHandle)
|
|
rc = -EAGAIN;
|
|
else
|
|
rc = server->ops->async_readv(rdata);
|
|
}
|
|
|
|
if (rc) {
|
|
add_credits_and_wake_if(server, &rdata->credits, 0);
|
|
kref_put(&rdata->refcount, cifs_readdata_release);
|
|
if (rc == -EAGAIN)
|
|
continue;
|
|
break;
|
|
}
|
|
|
|
list_add_tail(&rdata->list, rdata_list);
|
|
iov_iter_advance(&ctx->iter, cur_len);
|
|
fpos += cur_len;
|
|
len -= cur_len;
|
|
} while (len > 0);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void
|
|
collect_uncached_read_data(struct cifs_aio_ctx *ctx)
|
|
{
|
|
struct cifs_readdata *rdata, *tmp;
|
|
struct iov_iter *to = &ctx->iter;
|
|
struct cifs_sb_info *cifs_sb;
|
|
int rc;
|
|
|
|
cifs_sb = CIFS_SB(ctx->cfile->dentry->d_sb);
|
|
|
|
mutex_lock(&ctx->aio_mutex);
|
|
|
|
if (list_empty(&ctx->list)) {
|
|
mutex_unlock(&ctx->aio_mutex);
|
|
return;
|
|
}
|
|
|
|
rc = ctx->rc;
|
|
/* the loop below should proceed in the order of increasing offsets */
|
|
again:
|
|
list_for_each_entry_safe(rdata, tmp, &ctx->list, list) {
|
|
if (!rc) {
|
|
if (!try_wait_for_completion(&rdata->done)) {
|
|
mutex_unlock(&ctx->aio_mutex);
|
|
return;
|
|
}
|
|
|
|
if (rdata->result == -EAGAIN) {
|
|
/* resend call if it's a retryable error */
|
|
struct list_head tmp_list;
|
|
unsigned int got_bytes = rdata->got_bytes;
|
|
|
|
list_del_init(&rdata->list);
|
|
INIT_LIST_HEAD(&tmp_list);
|
|
|
|
if (ctx->direct_io) {
|
|
/*
|
|
* Re-use rdata as this is a
|
|
* direct I/O
|
|
*/
|
|
rc = cifs_resend_rdata(
|
|
rdata,
|
|
&tmp_list, ctx);
|
|
} else {
|
|
rc = cifs_send_async_read(
|
|
rdata->offset + got_bytes,
|
|
rdata->bytes - got_bytes,
|
|
rdata->cfile, cifs_sb,
|
|
&tmp_list, ctx);
|
|
|
|
kref_put(&rdata->refcount,
|
|
cifs_readdata_release);
|
|
}
|
|
|
|
list_splice(&tmp_list, &ctx->list);
|
|
|
|
goto again;
|
|
} else if (rdata->result)
|
|
rc = rdata->result;
|
|
|
|
/* if there was a short read -- discard anything left */
|
|
if (rdata->got_bytes && rdata->got_bytes < rdata->bytes)
|
|
rc = -ENODATA;
|
|
|
|
ctx->total_len += rdata->got_bytes;
|
|
}
|
|
list_del_init(&rdata->list);
|
|
kref_put(&rdata->refcount, cifs_readdata_release);
|
|
}
|
|
|
|
if (!ctx->direct_io)
|
|
ctx->total_len = ctx->len - iov_iter_count(to);
|
|
|
|
/* mask nodata case */
|
|
if (rc == -ENODATA)
|
|
rc = 0;
|
|
|
|
ctx->rc = (rc == 0) ? (ssize_t)ctx->total_len : rc;
|
|
|
|
mutex_unlock(&ctx->aio_mutex);
|
|
|
|
if (ctx->iocb && ctx->iocb->ki_complete)
|
|
ctx->iocb->ki_complete(ctx->iocb, ctx->rc);
|
|
else
|
|
complete(&ctx->done);
|
|
}
|
|
|
|
static ssize_t __cifs_readv(
|
|
struct kiocb *iocb, struct iov_iter *to, bool direct)
|
|
{
|
|
size_t len;
|
|
struct file *file = iocb->ki_filp;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifsFileInfo *cfile;
|
|
struct cifs_tcon *tcon;
|
|
ssize_t rc, total_read = 0;
|
|
loff_t offset = iocb->ki_pos;
|
|
struct cifs_aio_ctx *ctx;
|
|
|
|
len = iov_iter_count(to);
|
|
if (!len)
|
|
return 0;
|
|
|
|
cifs_sb = CIFS_FILE_SB(file);
|
|
cfile = file->private_data;
|
|
tcon = tlink_tcon(cfile->tlink);
|
|
|
|
if (!tcon->ses->server->ops->async_readv)
|
|
return -ENOSYS;
|
|
|
|
if ((file->f_flags & O_ACCMODE) == O_WRONLY)
|
|
cifs_dbg(FYI, "attempting read on write only file instance\n");
|
|
|
|
ctx = cifs_aio_ctx_alloc();
|
|
if (!ctx)
|
|
return -ENOMEM;
|
|
|
|
ctx->pos = offset;
|
|
ctx->direct_io = direct;
|
|
ctx->len = len;
|
|
ctx->cfile = cifsFileInfo_get(cfile);
|
|
ctx->nr_pinned_pages = 0;
|
|
|
|
if (!is_sync_kiocb(iocb))
|
|
ctx->iocb = iocb;
|
|
|
|
if (user_backed_iter(to)) {
|
|
/*
|
|
* Extract IOVEC/UBUF-type iterators to a BVEC-type iterator as
|
|
* they contain references to the calling process's virtual
|
|
* memory layout which won't be available in an async worker
|
|
* thread. This also takes a pin on every folio involved.
|
|
*/
|
|
rc = netfs_extract_user_iter(to, iov_iter_count(to),
|
|
&ctx->iter, 0);
|
|
if (rc < 0) {
|
|
kref_put(&ctx->refcount, cifs_aio_ctx_release);
|
|
return rc;
|
|
}
|
|
|
|
ctx->nr_pinned_pages = rc;
|
|
ctx->bv = (void *)ctx->iter.bvec;
|
|
ctx->bv_need_unpin = iov_iter_extract_will_pin(to);
|
|
ctx->should_dirty = true;
|
|
} else if ((iov_iter_is_bvec(to) || iov_iter_is_kvec(to)) &&
|
|
!is_sync_kiocb(iocb)) {
|
|
/*
|
|
* If the op is asynchronous, we need to copy the list attached
|
|
* to a BVEC/KVEC-type iterator, but we assume that the storage
|
|
* will be retained by the caller; in any case, we may or may
|
|
* not be able to pin the pages, so we don't try.
|
|
*/
|
|
ctx->bv = (void *)dup_iter(&ctx->iter, to, GFP_KERNEL);
|
|
if (!ctx->bv) {
|
|
kref_put(&ctx->refcount, cifs_aio_ctx_release);
|
|
return -ENOMEM;
|
|
}
|
|
} else {
|
|
/*
|
|
* Otherwise, we just pass the iterator down as-is and rely on
|
|
* the caller to make sure the pages referred to by the
|
|
* iterator don't evaporate.
|
|
*/
|
|
ctx->iter = *to;
|
|
}
|
|
|
|
if (direct) {
|
|
rc = filemap_write_and_wait_range(file->f_inode->i_mapping,
|
|
offset, offset + len - 1);
|
|
if (rc) {
|
|
kref_put(&ctx->refcount, cifs_aio_ctx_release);
|
|
return -EAGAIN;
|
|
}
|
|
}
|
|
|
|
/* grab a lock here due to read response handlers can access ctx */
|
|
mutex_lock(&ctx->aio_mutex);
|
|
|
|
rc = cifs_send_async_read(offset, len, cfile, cifs_sb, &ctx->list, ctx);
|
|
|
|
/* if at least one read request send succeeded, then reset rc */
|
|
if (!list_empty(&ctx->list))
|
|
rc = 0;
|
|
|
|
mutex_unlock(&ctx->aio_mutex);
|
|
|
|
if (rc) {
|
|
kref_put(&ctx->refcount, cifs_aio_ctx_release);
|
|
return rc;
|
|
}
|
|
|
|
if (!is_sync_kiocb(iocb)) {
|
|
kref_put(&ctx->refcount, cifs_aio_ctx_release);
|
|
return -EIOCBQUEUED;
|
|
}
|
|
|
|
rc = wait_for_completion_killable(&ctx->done);
|
|
if (rc) {
|
|
mutex_lock(&ctx->aio_mutex);
|
|
ctx->rc = rc = -EINTR;
|
|
total_read = ctx->total_len;
|
|
mutex_unlock(&ctx->aio_mutex);
|
|
} else {
|
|
rc = ctx->rc;
|
|
total_read = ctx->total_len;
|
|
}
|
|
|
|
kref_put(&ctx->refcount, cifs_aio_ctx_release);
|
|
|
|
if (total_read) {
|
|
iocb->ki_pos += total_read;
|
|
return total_read;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
ssize_t cifs_direct_readv(struct kiocb *iocb, struct iov_iter *to)
|
|
{
|
|
return __cifs_readv(iocb, to, true);
|
|
}
|
|
|
|
ssize_t cifs_user_readv(struct kiocb *iocb, struct iov_iter *to)
|
|
{
|
|
return __cifs_readv(iocb, to, false);
|
|
}
|
|
|
|
ssize_t
|
|
cifs_strict_readv(struct kiocb *iocb, struct iov_iter *to)
|
|
{
|
|
struct inode *inode = file_inode(iocb->ki_filp);
|
|
struct cifsInodeInfo *cinode = CIFS_I(inode);
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
|
|
struct cifsFileInfo *cfile = (struct cifsFileInfo *)
|
|
iocb->ki_filp->private_data;
|
|
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
|
|
int rc = -EACCES;
|
|
|
|
/*
|
|
* In strict cache mode we need to read from the server all the time
|
|
* if we don't have level II oplock because the server can delay mtime
|
|
* change - so we can't make a decision about inode invalidating.
|
|
* And we can also fail with pagereading if there are mandatory locks
|
|
* on pages affected by this read but not on the region from pos to
|
|
* pos+len-1.
|
|
*/
|
|
if (!CIFS_CACHE_READ(cinode))
|
|
return cifs_user_readv(iocb, to);
|
|
|
|
if (cap_unix(tcon->ses) &&
|
|
(CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
|
|
((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
|
|
return generic_file_read_iter(iocb, to);
|
|
|
|
/*
|
|
* We need to hold the sem to be sure nobody modifies lock list
|
|
* with a brlock that prevents reading.
|
|
*/
|
|
down_read(&cinode->lock_sem);
|
|
if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(to),
|
|
tcon->ses->server->vals->shared_lock_type,
|
|
0, NULL, CIFS_READ_OP))
|
|
rc = generic_file_read_iter(iocb, to);
|
|
up_read(&cinode->lock_sem);
|
|
return rc;
|
|
}
|
|
|
|
static ssize_t
|
|
cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset)
|
|
{
|
|
int rc = -EACCES;
|
|
unsigned int bytes_read = 0;
|
|
unsigned int total_read;
|
|
unsigned int current_read_size;
|
|
unsigned int rsize;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifs_tcon *tcon;
|
|
struct TCP_Server_Info *server;
|
|
unsigned int xid;
|
|
char *cur_offset;
|
|
struct cifsFileInfo *open_file;
|
|
struct cifs_io_parms io_parms = {0};
|
|
int buf_type = CIFS_NO_BUFFER;
|
|
__u32 pid;
|
|
|
|
xid = get_xid();
|
|
cifs_sb = CIFS_FILE_SB(file);
|
|
|
|
/* FIXME: set up handlers for larger reads and/or convert to async */
|
|
rsize = min_t(unsigned int, cifs_sb->ctx->rsize, CIFSMaxBufSize);
|
|
|
|
if (file->private_data == NULL) {
|
|
rc = -EBADF;
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
open_file = file->private_data;
|
|
tcon = tlink_tcon(open_file->tlink);
|
|
server = cifs_pick_channel(tcon->ses);
|
|
|
|
if (!server->ops->sync_read) {
|
|
free_xid(xid);
|
|
return -ENOSYS;
|
|
}
|
|
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
|
|
pid = open_file->pid;
|
|
else
|
|
pid = current->tgid;
|
|
|
|
if ((file->f_flags & O_ACCMODE) == O_WRONLY)
|
|
cifs_dbg(FYI, "attempting read on write only file instance\n");
|
|
|
|
for (total_read = 0, cur_offset = read_data; read_size > total_read;
|
|
total_read += bytes_read, cur_offset += bytes_read) {
|
|
do {
|
|
current_read_size = min_t(uint, read_size - total_read,
|
|
rsize);
|
|
/*
|
|
* For windows me and 9x we do not want to request more
|
|
* than it negotiated since it will refuse the read
|
|
* then.
|
|
*/
|
|
if (!(tcon->ses->capabilities &
|
|
tcon->ses->server->vals->cap_large_files)) {
|
|
current_read_size = min_t(uint,
|
|
current_read_size, CIFSMaxBufSize);
|
|
}
|
|
if (open_file->invalidHandle) {
|
|
rc = cifs_reopen_file(open_file, true);
|
|
if (rc != 0)
|
|
break;
|
|
}
|
|
io_parms.pid = pid;
|
|
io_parms.tcon = tcon;
|
|
io_parms.offset = *offset;
|
|
io_parms.length = current_read_size;
|
|
io_parms.server = server;
|
|
rc = server->ops->sync_read(xid, &open_file->fid, &io_parms,
|
|
&bytes_read, &cur_offset,
|
|
&buf_type);
|
|
} while (rc == -EAGAIN);
|
|
|
|
if (rc || (bytes_read == 0)) {
|
|
if (total_read) {
|
|
break;
|
|
} else {
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
} else {
|
|
cifs_stats_bytes_read(tcon, total_read);
|
|
*offset += bytes_read;
|
|
}
|
|
}
|
|
free_xid(xid);
|
|
return total_read;
|
|
}
|
|
|
|
/*
|
|
* If the page is mmap'ed into a process' page tables, then we need to make
|
|
* sure that it doesn't change while being written back.
|
|
*/
|
|
static vm_fault_t cifs_page_mkwrite(struct vm_fault *vmf)
|
|
{
|
|
struct folio *folio = page_folio(vmf->page);
|
|
|
|
/* Wait for the folio to be written to the cache before we allow it to
|
|
* be modified. We then assume the entire folio will need writing back.
|
|
*/
|
|
#ifdef CONFIG_CIFS_FSCACHE
|
|
if (folio_test_fscache(folio) &&
|
|
folio_wait_fscache_killable(folio) < 0)
|
|
return VM_FAULT_RETRY;
|
|
#endif
|
|
|
|
folio_wait_writeback(folio);
|
|
|
|
if (folio_lock_killable(folio) < 0)
|
|
return VM_FAULT_RETRY;
|
|
return VM_FAULT_LOCKED;
|
|
}
|
|
|
|
static const struct vm_operations_struct cifs_file_vm_ops = {
|
|
.fault = filemap_fault,
|
|
.map_pages = filemap_map_pages,
|
|
.page_mkwrite = cifs_page_mkwrite,
|
|
};
|
|
|
|
int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
int xid, rc = 0;
|
|
struct inode *inode = file_inode(file);
|
|
|
|
xid = get_xid();
|
|
|
|
if (!CIFS_CACHE_READ(CIFS_I(inode)))
|
|
rc = cifs_zap_mapping(inode);
|
|
if (!rc)
|
|
rc = generic_file_mmap(file, vma);
|
|
if (!rc)
|
|
vma->vm_ops = &cifs_file_vm_ops;
|
|
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
|
|
int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
int rc, xid;
|
|
|
|
xid = get_xid();
|
|
|
|
rc = cifs_revalidate_file(file);
|
|
if (rc)
|
|
cifs_dbg(FYI, "Validation prior to mmap failed, error=%d\n",
|
|
rc);
|
|
if (!rc)
|
|
rc = generic_file_mmap(file, vma);
|
|
if (!rc)
|
|
vma->vm_ops = &cifs_file_vm_ops;
|
|
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Unlock a bunch of folios in the pagecache.
|
|
*/
|
|
static void cifs_unlock_folios(struct address_space *mapping, pgoff_t first, pgoff_t last)
|
|
{
|
|
struct folio *folio;
|
|
XA_STATE(xas, &mapping->i_pages, first);
|
|
|
|
rcu_read_lock();
|
|
xas_for_each(&xas, folio, last) {
|
|
folio_unlock(folio);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void cifs_readahead_complete(struct work_struct *work)
|
|
{
|
|
struct cifs_readdata *rdata = container_of(work,
|
|
struct cifs_readdata, work);
|
|
struct folio *folio;
|
|
pgoff_t last;
|
|
bool good = rdata->result == 0 || (rdata->result == -EAGAIN && rdata->got_bytes);
|
|
|
|
XA_STATE(xas, &rdata->mapping->i_pages, rdata->offset / PAGE_SIZE);
|
|
|
|
if (good)
|
|
cifs_readahead_to_fscache(rdata->mapping->host,
|
|
rdata->offset, rdata->bytes);
|
|
|
|
if (iov_iter_count(&rdata->iter) > 0)
|
|
iov_iter_zero(iov_iter_count(&rdata->iter), &rdata->iter);
|
|
|
|
last = (rdata->offset + rdata->bytes - 1) / PAGE_SIZE;
|
|
|
|
rcu_read_lock();
|
|
xas_for_each(&xas, folio, last) {
|
|
if (good) {
|
|
flush_dcache_folio(folio);
|
|
folio_mark_uptodate(folio);
|
|
}
|
|
folio_unlock(folio);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
kref_put(&rdata->refcount, cifs_readdata_release);
|
|
}
|
|
|
|
static void cifs_readahead(struct readahead_control *ractl)
|
|
{
|
|
struct cifsFileInfo *open_file = ractl->file->private_data;
|
|
struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(ractl->file);
|
|
struct TCP_Server_Info *server;
|
|
unsigned int xid, nr_pages, cache_nr_pages = 0;
|
|
unsigned int ra_pages;
|
|
pgoff_t next_cached = ULONG_MAX, ra_index;
|
|
bool caching = fscache_cookie_enabled(cifs_inode_cookie(ractl->mapping->host)) &&
|
|
cifs_inode_cookie(ractl->mapping->host)->cache_priv;
|
|
bool check_cache = caching;
|
|
pid_t pid;
|
|
int rc = 0;
|
|
|
|
/* Note that readahead_count() lags behind our dequeuing of pages from
|
|
* the ractl, wo we have to keep track for ourselves.
|
|
*/
|
|
ra_pages = readahead_count(ractl);
|
|
ra_index = readahead_index(ractl);
|
|
|
|
xid = get_xid();
|
|
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
|
|
pid = open_file->pid;
|
|
else
|
|
pid = current->tgid;
|
|
|
|
server = cifs_pick_channel(tlink_tcon(open_file->tlink)->ses);
|
|
|
|
cifs_dbg(FYI, "%s: file=%p mapping=%p num_pages=%u\n",
|
|
__func__, ractl->file, ractl->mapping, ra_pages);
|
|
|
|
/*
|
|
* Chop the readahead request up into rsize-sized read requests.
|
|
*/
|
|
while ((nr_pages = ra_pages)) {
|
|
unsigned int i, rsize;
|
|
struct cifs_readdata *rdata;
|
|
struct cifs_credits credits_on_stack;
|
|
struct cifs_credits *credits = &credits_on_stack;
|
|
struct folio *folio;
|
|
pgoff_t fsize;
|
|
|
|
/*
|
|
* Find out if we have anything cached in the range of
|
|
* interest, and if so, where the next chunk of cached data is.
|
|
*/
|
|
if (caching) {
|
|
if (check_cache) {
|
|
rc = cifs_fscache_query_occupancy(
|
|
ractl->mapping->host, ra_index, nr_pages,
|
|
&next_cached, &cache_nr_pages);
|
|
if (rc < 0)
|
|
caching = false;
|
|
check_cache = false;
|
|
}
|
|
|
|
if (ra_index == next_cached) {
|
|
/*
|
|
* TODO: Send a whole batch of pages to be read
|
|
* by the cache.
|
|
*/
|
|
folio = readahead_folio(ractl);
|
|
fsize = folio_nr_pages(folio);
|
|
ra_pages -= fsize;
|
|
ra_index += fsize;
|
|
if (cifs_readpage_from_fscache(ractl->mapping->host,
|
|
&folio->page) < 0) {
|
|
/*
|
|
* TODO: Deal with cache read failure
|
|
* here, but for the moment, delegate
|
|
* that to readpage.
|
|
*/
|
|
caching = false;
|
|
}
|
|
folio_unlock(folio);
|
|
next_cached += fsize;
|
|
cache_nr_pages -= fsize;
|
|
if (cache_nr_pages == 0)
|
|
check_cache = true;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (open_file->invalidHandle) {
|
|
rc = cifs_reopen_file(open_file, true);
|
|
if (rc) {
|
|
if (rc == -EAGAIN)
|
|
continue;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (cifs_sb->ctx->rsize == 0)
|
|
cifs_sb->ctx->rsize =
|
|
server->ops->negotiate_rsize(tlink_tcon(open_file->tlink),
|
|
cifs_sb->ctx);
|
|
|
|
rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize,
|
|
&rsize, credits);
|
|
if (rc)
|
|
break;
|
|
nr_pages = min_t(size_t, rsize / PAGE_SIZE, ra_pages);
|
|
if (next_cached != ULONG_MAX)
|
|
nr_pages = min_t(size_t, nr_pages, next_cached - ra_index);
|
|
|
|
/*
|
|
* Give up immediately if rsize is too small to read an entire
|
|
* page. The VFS will fall back to readpage. We should never
|
|
* reach this point however since we set ra_pages to 0 when the
|
|
* rsize is smaller than a cache page.
|
|
*/
|
|
if (unlikely(!nr_pages)) {
|
|
add_credits_and_wake_if(server, credits, 0);
|
|
break;
|
|
}
|
|
|
|
rdata = cifs_readdata_alloc(cifs_readahead_complete);
|
|
if (!rdata) {
|
|
/* best to give up if we're out of mem */
|
|
add_credits_and_wake_if(server, credits, 0);
|
|
break;
|
|
}
|
|
|
|
rdata->offset = ra_index * PAGE_SIZE;
|
|
rdata->bytes = nr_pages * PAGE_SIZE;
|
|
rdata->cfile = cifsFileInfo_get(open_file);
|
|
rdata->server = server;
|
|
rdata->mapping = ractl->mapping;
|
|
rdata->pid = pid;
|
|
rdata->credits = credits_on_stack;
|
|
|
|
for (i = 0; i < nr_pages; i++) {
|
|
if (!readahead_folio(ractl))
|
|
WARN_ON(1);
|
|
}
|
|
ra_pages -= nr_pages;
|
|
ra_index += nr_pages;
|
|
|
|
iov_iter_xarray(&rdata->iter, ITER_DEST, &rdata->mapping->i_pages,
|
|
rdata->offset, rdata->bytes);
|
|
|
|
rc = adjust_credits(server, &rdata->credits, rdata->bytes);
|
|
if (!rc) {
|
|
if (rdata->cfile->invalidHandle)
|
|
rc = -EAGAIN;
|
|
else
|
|
rc = server->ops->async_readv(rdata);
|
|
}
|
|
|
|
if (rc) {
|
|
add_credits_and_wake_if(server, &rdata->credits, 0);
|
|
cifs_unlock_folios(rdata->mapping,
|
|
rdata->offset / PAGE_SIZE,
|
|
(rdata->offset + rdata->bytes - 1) / PAGE_SIZE);
|
|
/* Fallback to the readpage in error/reconnect cases */
|
|
kref_put(&rdata->refcount, cifs_readdata_release);
|
|
break;
|
|
}
|
|
|
|
kref_put(&rdata->refcount, cifs_readdata_release);
|
|
}
|
|
|
|
free_xid(xid);
|
|
}
|
|
|
|
/*
|
|
* cifs_readpage_worker must be called with the page pinned
|
|
*/
|
|
static int cifs_readpage_worker(struct file *file, struct page *page,
|
|
loff_t *poffset)
|
|
{
|
|
char *read_data;
|
|
int rc;
|
|
|
|
/* Is the page cached? */
|
|
rc = cifs_readpage_from_fscache(file_inode(file), page);
|
|
if (rc == 0)
|
|
goto read_complete;
|
|
|
|
read_data = kmap(page);
|
|
/* for reads over a certain size could initiate async read ahead */
|
|
|
|
rc = cifs_read(file, read_data, PAGE_SIZE, poffset);
|
|
|
|
if (rc < 0)
|
|
goto io_error;
|
|
else
|
|
cifs_dbg(FYI, "Bytes read %d\n", rc);
|
|
|
|
/* we do not want atime to be less than mtime, it broke some apps */
|
|
file_inode(file)->i_atime = current_time(file_inode(file));
|
|
if (timespec64_compare(&(file_inode(file)->i_atime), &(file_inode(file)->i_mtime)))
|
|
file_inode(file)->i_atime = file_inode(file)->i_mtime;
|
|
else
|
|
file_inode(file)->i_atime = current_time(file_inode(file));
|
|
|
|
if (PAGE_SIZE > rc)
|
|
memset(read_data + rc, 0, PAGE_SIZE - rc);
|
|
|
|
flush_dcache_page(page);
|
|
SetPageUptodate(page);
|
|
rc = 0;
|
|
|
|
io_error:
|
|
kunmap(page);
|
|
unlock_page(page);
|
|
|
|
read_complete:
|
|
return rc;
|
|
}
|
|
|
|
static int cifs_read_folio(struct file *file, struct folio *folio)
|
|
{
|
|
struct page *page = &folio->page;
|
|
loff_t offset = page_file_offset(page);
|
|
int rc = -EACCES;
|
|
unsigned int xid;
|
|
|
|
xid = get_xid();
|
|
|
|
if (file->private_data == NULL) {
|
|
rc = -EBADF;
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
|
|
cifs_dbg(FYI, "read_folio %p at offset %d 0x%x\n",
|
|
page, (int)offset, (int)offset);
|
|
|
|
rc = cifs_readpage_worker(file, page, &offset);
|
|
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
|
|
static int is_inode_writable(struct cifsInodeInfo *cifs_inode)
|
|
{
|
|
struct cifsFileInfo *open_file;
|
|
|
|
spin_lock(&cifs_inode->open_file_lock);
|
|
list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
|
|
if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
|
|
spin_unlock(&cifs_inode->open_file_lock);
|
|
return 1;
|
|
}
|
|
}
|
|
spin_unlock(&cifs_inode->open_file_lock);
|
|
return 0;
|
|
}
|
|
|
|
/* We do not want to update the file size from server for inodes
|
|
open for write - to avoid races with writepage extending
|
|
the file - in the future we could consider allowing
|
|
refreshing the inode only on increases in the file size
|
|
but this is tricky to do without racing with writebehind
|
|
page caching in the current Linux kernel design */
|
|
bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file)
|
|
{
|
|
if (!cifsInode)
|
|
return true;
|
|
|
|
if (is_inode_writable(cifsInode)) {
|
|
/* This inode is open for write at least once */
|
|
struct cifs_sb_info *cifs_sb;
|
|
|
|
cifs_sb = CIFS_SB(cifsInode->netfs.inode.i_sb);
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
|
|
/* since no page cache to corrupt on directio
|
|
we can change size safely */
|
|
return true;
|
|
}
|
|
|
|
if (i_size_read(&cifsInode->netfs.inode) < end_of_file)
|
|
return true;
|
|
|
|
return false;
|
|
} else
|
|
return true;
|
|
}
|
|
|
|
static int cifs_write_begin(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len,
|
|
struct page **pagep, void **fsdata)
|
|
{
|
|
int oncethru = 0;
|
|
pgoff_t index = pos >> PAGE_SHIFT;
|
|
loff_t offset = pos & (PAGE_SIZE - 1);
|
|
loff_t page_start = pos & PAGE_MASK;
|
|
loff_t i_size;
|
|
struct page *page;
|
|
int rc = 0;
|
|
|
|
cifs_dbg(FYI, "write_begin from %lld len %d\n", (long long)pos, len);
|
|
|
|
start:
|
|
page = grab_cache_page_write_begin(mapping, index);
|
|
if (!page) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (PageUptodate(page))
|
|
goto out;
|
|
|
|
/*
|
|
* If we write a full page it will be up to date, no need to read from
|
|
* the server. If the write is short, we'll end up doing a sync write
|
|
* instead.
|
|
*/
|
|
if (len == PAGE_SIZE)
|
|
goto out;
|
|
|
|
/*
|
|
* optimize away the read when we have an oplock, and we're not
|
|
* expecting to use any of the data we'd be reading in. That
|
|
* is, when the page lies beyond the EOF, or straddles the EOF
|
|
* and the write will cover all of the existing data.
|
|
*/
|
|
if (CIFS_CACHE_READ(CIFS_I(mapping->host))) {
|
|
i_size = i_size_read(mapping->host);
|
|
if (page_start >= i_size ||
|
|
(offset == 0 && (pos + len) >= i_size)) {
|
|
zero_user_segments(page, 0, offset,
|
|
offset + len,
|
|
PAGE_SIZE);
|
|
/*
|
|
* PageChecked means that the parts of the page
|
|
* to which we're not writing are considered up
|
|
* to date. Once the data is copied to the
|
|
* page, it can be set uptodate.
|
|
*/
|
|
SetPageChecked(page);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if ((file->f_flags & O_ACCMODE) != O_WRONLY && !oncethru) {
|
|
/*
|
|
* might as well read a page, it is fast enough. If we get
|
|
* an error, we don't need to return it. cifs_write_end will
|
|
* do a sync write instead since PG_uptodate isn't set.
|
|
*/
|
|
cifs_readpage_worker(file, page, &page_start);
|
|
put_page(page);
|
|
oncethru = 1;
|
|
goto start;
|
|
} else {
|
|
/* we could try using another file handle if there is one -
|
|
but how would we lock it to prevent close of that handle
|
|
racing with this read? In any case
|
|
this will be written out by write_end so is fine */
|
|
}
|
|
out:
|
|
*pagep = page;
|
|
return rc;
|
|
}
|
|
|
|
static bool cifs_release_folio(struct folio *folio, gfp_t gfp)
|
|
{
|
|
if (folio_test_private(folio))
|
|
return 0;
|
|
if (folio_test_fscache(folio)) {
|
|
if (current_is_kswapd() || !(gfp & __GFP_FS))
|
|
return false;
|
|
folio_wait_fscache(folio);
|
|
}
|
|
fscache_note_page_release(cifs_inode_cookie(folio->mapping->host));
|
|
return true;
|
|
}
|
|
|
|
static void cifs_invalidate_folio(struct folio *folio, size_t offset,
|
|
size_t length)
|
|
{
|
|
folio_wait_fscache(folio);
|
|
}
|
|
|
|
static int cifs_launder_folio(struct folio *folio)
|
|
{
|
|
int rc = 0;
|
|
loff_t range_start = folio_pos(folio);
|
|
loff_t range_end = range_start + folio_size(folio);
|
|
struct writeback_control wbc = {
|
|
.sync_mode = WB_SYNC_ALL,
|
|
.nr_to_write = 0,
|
|
.range_start = range_start,
|
|
.range_end = range_end,
|
|
};
|
|
|
|
cifs_dbg(FYI, "Launder page: %lu\n", folio->index);
|
|
|
|
if (folio_clear_dirty_for_io(folio))
|
|
rc = cifs_writepage_locked(&folio->page, &wbc);
|
|
|
|
folio_wait_fscache(folio);
|
|
return rc;
|
|
}
|
|
|
|
void cifs_oplock_break(struct work_struct *work)
|
|
{
|
|
struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo,
|
|
oplock_break);
|
|
struct inode *inode = d_inode(cfile->dentry);
|
|
struct cifsInodeInfo *cinode = CIFS_I(inode);
|
|
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
|
|
struct TCP_Server_Info *server = tcon->ses->server;
|
|
int rc = 0;
|
|
bool purge_cache = false;
|
|
|
|
wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS,
|
|
TASK_UNINTERRUPTIBLE);
|
|
|
|
server->ops->downgrade_oplock(server, cinode, cfile->oplock_level,
|
|
cfile->oplock_epoch, &purge_cache);
|
|
|
|
if (!CIFS_CACHE_WRITE(cinode) && CIFS_CACHE_READ(cinode) &&
|
|
cifs_has_mand_locks(cinode)) {
|
|
cifs_dbg(FYI, "Reset oplock to None for inode=%p due to mand locks\n",
|
|
inode);
|
|
cinode->oplock = 0;
|
|
}
|
|
|
|
if (inode && S_ISREG(inode->i_mode)) {
|
|
if (CIFS_CACHE_READ(cinode))
|
|
break_lease(inode, O_RDONLY);
|
|
else
|
|
break_lease(inode, O_WRONLY);
|
|
rc = filemap_fdatawrite(inode->i_mapping);
|
|
if (!CIFS_CACHE_READ(cinode) || purge_cache) {
|
|
rc = filemap_fdatawait(inode->i_mapping);
|
|
mapping_set_error(inode->i_mapping, rc);
|
|
cifs_zap_mapping(inode);
|
|
}
|
|
cifs_dbg(FYI, "Oplock flush inode %p rc %d\n", inode, rc);
|
|
if (CIFS_CACHE_WRITE(cinode))
|
|
goto oplock_break_ack;
|
|
}
|
|
|
|
rc = cifs_push_locks(cfile);
|
|
if (rc)
|
|
cifs_dbg(VFS, "Push locks rc = %d\n", rc);
|
|
|
|
oplock_break_ack:
|
|
/*
|
|
* releasing stale oplock after recent reconnect of smb session using
|
|
* a now incorrect file handle is not a data integrity issue but do
|
|
* not bother sending an oplock release if session to server still is
|
|
* disconnected since oplock already released by the server
|
|
*/
|
|
if (!cfile->oplock_break_cancelled) {
|
|
rc = tcon->ses->server->ops->oplock_response(tcon, &cfile->fid,
|
|
cinode);
|
|
cifs_dbg(FYI, "Oplock release rc = %d\n", rc);
|
|
}
|
|
|
|
_cifsFileInfo_put(cfile, false /* do not wait for ourself */, false);
|
|
cifs_done_oplock_break(cinode);
|
|
}
|
|
|
|
/*
|
|
* The presence of cifs_direct_io() in the address space ops vector
|
|
* allowes open() O_DIRECT flags which would have failed otherwise.
|
|
*
|
|
* In the non-cached mode (mount with cache=none), we shunt off direct read and write requests
|
|
* so this method should never be called.
|
|
*
|
|
* Direct IO is not yet supported in the cached mode.
|
|
*/
|
|
static ssize_t
|
|
cifs_direct_io(struct kiocb *iocb, struct iov_iter *iter)
|
|
{
|
|
/*
|
|
* FIXME
|
|
* Eventually need to support direct IO for non forcedirectio mounts
|
|
*/
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int cifs_swap_activate(struct swap_info_struct *sis,
|
|
struct file *swap_file, sector_t *span)
|
|
{
|
|
struct cifsFileInfo *cfile = swap_file->private_data;
|
|
struct inode *inode = swap_file->f_mapping->host;
|
|
unsigned long blocks;
|
|
long long isize;
|
|
|
|
cifs_dbg(FYI, "swap activate\n");
|
|
|
|
if (!swap_file->f_mapping->a_ops->swap_rw)
|
|
/* Cannot support swap */
|
|
return -EINVAL;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
blocks = inode->i_blocks;
|
|
isize = inode->i_size;
|
|
spin_unlock(&inode->i_lock);
|
|
if (blocks*512 < isize) {
|
|
pr_warn("swap activate: swapfile has holes\n");
|
|
return -EINVAL;
|
|
}
|
|
*span = sis->pages;
|
|
|
|
pr_warn_once("Swap support over SMB3 is experimental\n");
|
|
|
|
/*
|
|
* TODO: consider adding ACL (or documenting how) to prevent other
|
|
* users (on this or other systems) from reading it
|
|
*/
|
|
|
|
|
|
/* TODO: add sk_set_memalloc(inet) or similar */
|
|
|
|
if (cfile)
|
|
cfile->swapfile = true;
|
|
/*
|
|
* TODO: Since file already open, we can't open with DENY_ALL here
|
|
* but we could add call to grab a byte range lock to prevent others
|
|
* from reading or writing the file
|
|
*/
|
|
|
|
sis->flags |= SWP_FS_OPS;
|
|
return add_swap_extent(sis, 0, sis->max, 0);
|
|
}
|
|
|
|
static void cifs_swap_deactivate(struct file *file)
|
|
{
|
|
struct cifsFileInfo *cfile = file->private_data;
|
|
|
|
cifs_dbg(FYI, "swap deactivate\n");
|
|
|
|
/* TODO: undo sk_set_memalloc(inet) will eventually be needed */
|
|
|
|
if (cfile)
|
|
cfile->swapfile = false;
|
|
|
|
/* do we need to unpin (or unlock) the file */
|
|
}
|
|
|
|
/*
|
|
* Mark a page as having been made dirty and thus needing writeback. We also
|
|
* need to pin the cache object to write back to.
|
|
*/
|
|
#ifdef CONFIG_CIFS_FSCACHE
|
|
static bool cifs_dirty_folio(struct address_space *mapping, struct folio *folio)
|
|
{
|
|
return fscache_dirty_folio(mapping, folio,
|
|
cifs_inode_cookie(mapping->host));
|
|
}
|
|
#else
|
|
#define cifs_dirty_folio filemap_dirty_folio
|
|
#endif
|
|
|
|
const struct address_space_operations cifs_addr_ops = {
|
|
.read_folio = cifs_read_folio,
|
|
.readahead = cifs_readahead,
|
|
.writepages = cifs_writepages,
|
|
.write_begin = cifs_write_begin,
|
|
.write_end = cifs_write_end,
|
|
.dirty_folio = cifs_dirty_folio,
|
|
.release_folio = cifs_release_folio,
|
|
.direct_IO = cifs_direct_io,
|
|
.invalidate_folio = cifs_invalidate_folio,
|
|
.launder_folio = cifs_launder_folio,
|
|
.migrate_folio = filemap_migrate_folio,
|
|
/*
|
|
* TODO: investigate and if useful we could add an is_dirty_writeback
|
|
* helper if needed
|
|
*/
|
|
.swap_activate = cifs_swap_activate,
|
|
.swap_deactivate = cifs_swap_deactivate,
|
|
};
|
|
|
|
/*
|
|
* cifs_readahead requires the server to support a buffer large enough to
|
|
* contain the header plus one complete page of data. Otherwise, we need
|
|
* to leave cifs_readahead out of the address space operations.
|
|
*/
|
|
const struct address_space_operations cifs_addr_ops_smallbuf = {
|
|
.read_folio = cifs_read_folio,
|
|
.writepages = cifs_writepages,
|
|
.write_begin = cifs_write_begin,
|
|
.write_end = cifs_write_end,
|
|
.dirty_folio = cifs_dirty_folio,
|
|
.release_folio = cifs_release_folio,
|
|
.invalidate_folio = cifs_invalidate_folio,
|
|
.launder_folio = cifs_launder_folio,
|
|
.migrate_folio = filemap_migrate_folio,
|
|
};
|
|
|
|
/*
|
|
* Splice data from a file into a pipe.
|
|
*/
|
|
ssize_t cifs_splice_read(struct file *in, loff_t *ppos,
|
|
struct pipe_inode_info *pipe, size_t len,
|
|
unsigned int flags)
|
|
{
|
|
if (unlikely(*ppos >= file_inode(in)->i_sb->s_maxbytes))
|
|
return 0;
|
|
if (unlikely(!len))
|
|
return 0;
|
|
if (in->f_flags & O_DIRECT)
|
|
return direct_splice_read(in, ppos, pipe, len, flags);
|
|
return filemap_splice_read(in, ppos, pipe, len, flags);
|
|
}
|