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![David Howells](/assets/img/avatar_default.png)
Fix afs_do_lookup() such that when it does an inline bulk status fetch op,
it will update inodes that are already extant (something that afs_iget()
doesn't do) and to cache permits for each inode created (thereby avoiding a
follow up FS.FetchStatus call to determine this).
Extant inodes need looking up in advance so that their cb_break counters
before and after the operation can be compared. To this end, the inode
pointers are cached so that they don't need looking up again after the op.
Fixes: 5cf9dd55a0
("afs: Prospectively look up extra files when doing a single lookup")
Signed-off-by: David Howells <dhowells@redhat.com>
1923 lines
49 KiB
C
1923 lines
49 KiB
C
/* dir.c: AFS filesystem directory handling
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*
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* Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/namei.h>
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#include <linux/pagemap.h>
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#include <linux/swap.h>
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#include <linux/ctype.h>
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#include <linux/sched.h>
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#include <linux/task_io_accounting_ops.h>
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#include "internal.h"
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#include "afs_fs.h"
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#include "xdr_fs.h"
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static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
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unsigned int flags);
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static int afs_dir_open(struct inode *inode, struct file *file);
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static int afs_readdir(struct file *file, struct dir_context *ctx);
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static int afs_d_revalidate(struct dentry *dentry, unsigned int flags);
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static int afs_d_delete(const struct dentry *dentry);
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static void afs_d_iput(struct dentry *dentry, struct inode *inode);
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static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen,
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loff_t fpos, u64 ino, unsigned dtype);
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static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
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loff_t fpos, u64 ino, unsigned dtype);
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static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
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bool excl);
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static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
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static int afs_rmdir(struct inode *dir, struct dentry *dentry);
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static int afs_unlink(struct inode *dir, struct dentry *dentry);
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static int afs_link(struct dentry *from, struct inode *dir,
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struct dentry *dentry);
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static int afs_symlink(struct inode *dir, struct dentry *dentry,
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const char *content);
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static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
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struct inode *new_dir, struct dentry *new_dentry,
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unsigned int flags);
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static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags);
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static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
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unsigned int length);
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static int afs_dir_set_page_dirty(struct page *page)
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{
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BUG(); /* This should never happen. */
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}
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const struct file_operations afs_dir_file_operations = {
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.open = afs_dir_open,
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.release = afs_release,
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.iterate_shared = afs_readdir,
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.lock = afs_lock,
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.llseek = generic_file_llseek,
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};
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const struct inode_operations afs_dir_inode_operations = {
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.create = afs_create,
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.lookup = afs_lookup,
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.link = afs_link,
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.unlink = afs_unlink,
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.symlink = afs_symlink,
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.mkdir = afs_mkdir,
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.rmdir = afs_rmdir,
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.rename = afs_rename,
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.permission = afs_permission,
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.getattr = afs_getattr,
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.setattr = afs_setattr,
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.listxattr = afs_listxattr,
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};
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const struct address_space_operations afs_dir_aops = {
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.set_page_dirty = afs_dir_set_page_dirty,
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.releasepage = afs_dir_releasepage,
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.invalidatepage = afs_dir_invalidatepage,
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};
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const struct dentry_operations afs_fs_dentry_operations = {
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.d_revalidate = afs_d_revalidate,
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.d_delete = afs_d_delete,
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.d_release = afs_d_release,
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.d_automount = afs_d_automount,
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.d_iput = afs_d_iput,
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};
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struct afs_lookup_one_cookie {
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struct dir_context ctx;
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struct qstr name;
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bool found;
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struct afs_fid fid;
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};
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struct afs_lookup_cookie {
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struct dir_context ctx;
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struct qstr name;
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bool found;
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bool one_only;
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unsigned short nr_fids;
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struct inode **inodes;
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struct afs_status_cb *statuses;
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struct afs_fid fids[50];
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};
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/*
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* check that a directory page is valid
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*/
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static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page,
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loff_t i_size)
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{
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struct afs_xdr_dir_page *dbuf;
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loff_t latter, off;
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int tmp, qty;
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/* Determine how many magic numbers there should be in this page, but
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* we must take care because the directory may change size under us.
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*/
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off = page_offset(page);
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if (i_size <= off)
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goto checked;
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latter = i_size - off;
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if (latter >= PAGE_SIZE)
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qty = PAGE_SIZE;
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else
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qty = latter;
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qty /= sizeof(union afs_xdr_dir_block);
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/* check them */
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dbuf = kmap(page);
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for (tmp = 0; tmp < qty; tmp++) {
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if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) {
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printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n",
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__func__, dvnode->vfs_inode.i_ino, tmp, qty,
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ntohs(dbuf->blocks[tmp].hdr.magic));
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trace_afs_dir_check_failed(dvnode, off, i_size);
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kunmap(page);
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trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic);
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goto error;
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}
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/* Make sure each block is NUL terminated so we can reasonably
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* use string functions on it. The filenames in the page
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* *should* be NUL-terminated anyway.
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*/
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((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0;
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}
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kunmap(page);
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checked:
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afs_stat_v(dvnode, n_read_dir);
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return true;
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error:
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return false;
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}
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/*
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* Check the contents of a directory that we've just read.
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*/
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static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req)
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{
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struct afs_xdr_dir_page *dbuf;
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unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block);
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for (i = 0; i < req->nr_pages; i++)
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if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len))
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goto bad;
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return true;
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bad:
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pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n",
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dvnode->fid.vid, dvnode->fid.vnode,
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req->file_size, req->len, req->actual_len, req->remain);
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pr_warn("DIR %llx %x %x %x\n",
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req->pos, req->index, req->nr_pages, req->offset);
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for (i = 0; i < req->nr_pages; i++) {
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dbuf = kmap(req->pages[i]);
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for (j = 0; j < qty; j++) {
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union afs_xdr_dir_block *block = &dbuf->blocks[j];
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pr_warn("[%02x] %32phN\n", i * qty + j, block);
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}
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kunmap(req->pages[i]);
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}
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return false;
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}
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/*
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* open an AFS directory file
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*/
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static int afs_dir_open(struct inode *inode, struct file *file)
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{
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_enter("{%lu}", inode->i_ino);
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BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
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BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
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if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
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return -ENOENT;
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return afs_open(inode, file);
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}
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/*
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* Read the directory into the pagecache in one go, scrubbing the previous
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* contents. The list of pages is returned, pinning them so that they don't
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* get reclaimed during the iteration.
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*/
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static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
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__acquires(&dvnode->validate_lock)
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{
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struct afs_read *req;
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loff_t i_size;
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int nr_pages, nr_inline, i, n;
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int ret = -ENOMEM;
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retry:
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i_size = i_size_read(&dvnode->vfs_inode);
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if (i_size < 2048)
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return ERR_PTR(afs_bad(dvnode, afs_file_error_dir_small));
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if (i_size > 2048 * 1024) {
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trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big);
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return ERR_PTR(-EFBIG);
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}
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_enter("%llu", i_size);
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/* Get a request record to hold the page list. We want to hold it
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* inline if we can, but we don't want to make an order 1 allocation.
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*/
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nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE;
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nr_inline = nr_pages;
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if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *))
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nr_inline = 0;
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req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline,
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GFP_KERNEL);
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if (!req)
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return ERR_PTR(-ENOMEM);
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refcount_set(&req->usage, 1);
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req->nr_pages = nr_pages;
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req->actual_len = i_size; /* May change */
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req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */
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req->data_version = dvnode->status.data_version; /* May change */
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if (nr_inline > 0) {
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req->pages = req->array;
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} else {
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req->pages = kcalloc(nr_pages, sizeof(struct page *),
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GFP_KERNEL);
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if (!req->pages)
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goto error;
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}
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/* Get a list of all the pages that hold or will hold the directory
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* content. We need to fill in any gaps that we might find where the
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* memory reclaimer has been at work. If there are any gaps, we will
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* need to reread the entire directory contents.
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*/
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i = 0;
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do {
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n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i,
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req->nr_pages - i,
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req->pages + i);
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_debug("find %u at %u/%u", n, i, req->nr_pages);
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if (n == 0) {
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gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask;
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if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
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afs_stat_v(dvnode, n_inval);
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ret = -ENOMEM;
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req->pages[i] = __page_cache_alloc(gfp);
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if (!req->pages[i])
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goto error;
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ret = add_to_page_cache_lru(req->pages[i],
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dvnode->vfs_inode.i_mapping,
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i, gfp);
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if (ret < 0)
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goto error;
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set_page_private(req->pages[i], 1);
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SetPagePrivate(req->pages[i]);
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unlock_page(req->pages[i]);
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i++;
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} else {
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i += n;
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}
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} while (i < req->nr_pages);
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/* If we're going to reload, we need to lock all the pages to prevent
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* races.
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*/
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ret = -ERESTARTSYS;
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if (down_read_killable(&dvnode->validate_lock) < 0)
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goto error;
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if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
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goto success;
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up_read(&dvnode->validate_lock);
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if (down_write_killable(&dvnode->validate_lock) < 0)
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goto error;
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if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
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trace_afs_reload_dir(dvnode);
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ret = afs_fetch_data(dvnode, key, req);
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if (ret < 0)
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goto error_unlock;
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task_io_account_read(PAGE_SIZE * req->nr_pages);
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if (req->len < req->file_size)
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goto content_has_grown;
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/* Validate the data we just read. */
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ret = -EIO;
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if (!afs_dir_check_pages(dvnode, req))
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goto error_unlock;
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// TODO: Trim excess pages
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set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
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}
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downgrade_write(&dvnode->validate_lock);
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success:
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return req;
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error_unlock:
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up_write(&dvnode->validate_lock);
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error:
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afs_put_read(req);
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_leave(" = %d", ret);
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return ERR_PTR(ret);
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content_has_grown:
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up_write(&dvnode->validate_lock);
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afs_put_read(req);
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goto retry;
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}
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/*
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* deal with one block in an AFS directory
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*/
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static int afs_dir_iterate_block(struct afs_vnode *dvnode,
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struct dir_context *ctx,
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union afs_xdr_dir_block *block,
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unsigned blkoff)
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{
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union afs_xdr_dirent *dire;
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unsigned offset, next, curr;
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size_t nlen;
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int tmp;
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_enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block);
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curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent);
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/* walk through the block, an entry at a time */
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for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
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offset < AFS_DIR_SLOTS_PER_BLOCK;
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offset = next
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) {
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next = offset + 1;
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/* skip entries marked unused in the bitmap */
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if (!(block->hdr.bitmap[offset / 8] &
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(1 << (offset % 8)))) {
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_debug("ENT[%zu.%u]: unused",
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blkoff / sizeof(union afs_xdr_dir_block), offset);
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if (offset >= curr)
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ctx->pos = blkoff +
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next * sizeof(union afs_xdr_dirent);
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continue;
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}
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/* got a valid entry */
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dire = &block->dirents[offset];
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nlen = strnlen(dire->u.name,
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sizeof(*block) -
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offset * sizeof(union afs_xdr_dirent));
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_debug("ENT[%zu.%u]: %s %zu \"%s\"",
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blkoff / sizeof(union afs_xdr_dir_block), offset,
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(offset < curr ? "skip" : "fill"),
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nlen, dire->u.name);
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|
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/* work out where the next possible entry is */
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for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) {
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if (next >= AFS_DIR_SLOTS_PER_BLOCK) {
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_debug("ENT[%zu.%u]:"
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" %u travelled beyond end dir block"
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" (len %u/%zu)",
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blkoff / sizeof(union afs_xdr_dir_block),
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offset, next, tmp, nlen);
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return afs_bad(dvnode, afs_file_error_dir_over_end);
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}
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if (!(block->hdr.bitmap[next / 8] &
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(1 << (next % 8)))) {
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_debug("ENT[%zu.%u]:"
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" %u unmarked extension (len %u/%zu)",
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blkoff / sizeof(union afs_xdr_dir_block),
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offset, next, tmp, nlen);
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return afs_bad(dvnode, afs_file_error_dir_unmarked_ext);
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}
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_debug("ENT[%zu.%u]: ext %u/%zu",
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blkoff / sizeof(union afs_xdr_dir_block),
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next, tmp, nlen);
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next++;
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}
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/* skip if starts before the current position */
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if (offset < curr)
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continue;
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|
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/* found the next entry */
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if (!dir_emit(ctx, dire->u.name, nlen,
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ntohl(dire->u.vnode),
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(ctx->actor == afs_lookup_filldir ||
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ctx->actor == afs_lookup_one_filldir)?
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ntohl(dire->u.unique) : DT_UNKNOWN)) {
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_leave(" = 0 [full]");
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return 0;
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}
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ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
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}
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_leave(" = 1 [more]");
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return 1;
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}
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|
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/*
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* iterate through the data blob that lists the contents of an AFS directory
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*/
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static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
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struct key *key)
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{
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struct afs_vnode *dvnode = AFS_FS_I(dir);
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struct afs_xdr_dir_page *dbuf;
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union afs_xdr_dir_block *dblock;
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struct afs_read *req;
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struct page *page;
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unsigned blkoff, limit;
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int ret;
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_enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
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if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
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_leave(" = -ESTALE");
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return -ESTALE;
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}
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|
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req = afs_read_dir(dvnode, key);
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if (IS_ERR(req))
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return PTR_ERR(req);
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|
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/* round the file position up to the next entry boundary */
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ctx->pos += sizeof(union afs_xdr_dirent) - 1;
|
|
ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1);
|
|
|
|
/* walk through the blocks in sequence */
|
|
ret = 0;
|
|
while (ctx->pos < req->actual_len) {
|
|
blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1);
|
|
|
|
/* Fetch the appropriate page from the directory and re-add it
|
|
* to the LRU.
|
|
*/
|
|
page = req->pages[blkoff / PAGE_SIZE];
|
|
if (!page) {
|
|
ret = afs_bad(dvnode, afs_file_error_dir_missing_page);
|
|
break;
|
|
}
|
|
mark_page_accessed(page);
|
|
|
|
limit = blkoff & ~(PAGE_SIZE - 1);
|
|
|
|
dbuf = kmap(page);
|
|
|
|
/* deal with the individual blocks stashed on this page */
|
|
do {
|
|
dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
|
|
sizeof(union afs_xdr_dir_block)];
|
|
ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff);
|
|
if (ret != 1) {
|
|
kunmap(page);
|
|
goto out;
|
|
}
|
|
|
|
blkoff += sizeof(union afs_xdr_dir_block);
|
|
|
|
} while (ctx->pos < dir->i_size && blkoff < limit);
|
|
|
|
kunmap(page);
|
|
ret = 0;
|
|
}
|
|
|
|
out:
|
|
up_read(&dvnode->validate_lock);
|
|
afs_put_read(req);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* read an AFS directory
|
|
*/
|
|
static int afs_readdir(struct file *file, struct dir_context *ctx)
|
|
{
|
|
return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file));
|
|
}
|
|
|
|
/*
|
|
* Search the directory for a single name
|
|
* - if afs_dir_iterate_block() spots this function, it'll pass the FID
|
|
* uniquifier through dtype
|
|
*/
|
|
static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
|
|
int nlen, loff_t fpos, u64 ino, unsigned dtype)
|
|
{
|
|
struct afs_lookup_one_cookie *cookie =
|
|
container_of(ctx, struct afs_lookup_one_cookie, ctx);
|
|
|
|
_enter("{%s,%u},%s,%u,,%llu,%u",
|
|
cookie->name.name, cookie->name.len, name, nlen,
|
|
(unsigned long long) ino, dtype);
|
|
|
|
/* insanity checks first */
|
|
BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
|
|
BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
|
|
|
|
if (cookie->name.len != nlen ||
|
|
memcmp(cookie->name.name, name, nlen) != 0) {
|
|
_leave(" = 0 [no]");
|
|
return 0;
|
|
}
|
|
|
|
cookie->fid.vnode = ino;
|
|
cookie->fid.unique = dtype;
|
|
cookie->found = 1;
|
|
|
|
_leave(" = -1 [found]");
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Do a lookup of a single name in a directory
|
|
* - just returns the FID the dentry name maps to if found
|
|
*/
|
|
static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry,
|
|
struct afs_fid *fid, struct key *key)
|
|
{
|
|
struct afs_super_info *as = dir->i_sb->s_fs_info;
|
|
struct afs_lookup_one_cookie cookie = {
|
|
.ctx.actor = afs_lookup_one_filldir,
|
|
.name = dentry->d_name,
|
|
.fid.vid = as->volume->vid
|
|
};
|
|
int ret;
|
|
|
|
_enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
|
|
|
|
/* search the directory */
|
|
ret = afs_dir_iterate(dir, &cookie.ctx, key);
|
|
if (ret < 0) {
|
|
_leave(" = %d [iter]", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = -ENOENT;
|
|
if (!cookie.found) {
|
|
_leave(" = -ENOENT [not found]");
|
|
return -ENOENT;
|
|
}
|
|
|
|
*fid = cookie.fid;
|
|
_leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* search the directory for a name
|
|
* - if afs_dir_iterate_block() spots this function, it'll pass the FID
|
|
* uniquifier through dtype
|
|
*/
|
|
static int afs_lookup_filldir(struct dir_context *ctx, const char *name,
|
|
int nlen, loff_t fpos, u64 ino, unsigned dtype)
|
|
{
|
|
struct afs_lookup_cookie *cookie =
|
|
container_of(ctx, struct afs_lookup_cookie, ctx);
|
|
int ret;
|
|
|
|
_enter("{%s,%u},%s,%u,,%llu,%u",
|
|
cookie->name.name, cookie->name.len, name, nlen,
|
|
(unsigned long long) ino, dtype);
|
|
|
|
/* insanity checks first */
|
|
BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
|
|
BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
|
|
|
|
if (cookie->found) {
|
|
if (cookie->nr_fids < 50) {
|
|
cookie->fids[cookie->nr_fids].vnode = ino;
|
|
cookie->fids[cookie->nr_fids].unique = dtype;
|
|
cookie->nr_fids++;
|
|
}
|
|
} else if (cookie->name.len == nlen &&
|
|
memcmp(cookie->name.name, name, nlen) == 0) {
|
|
cookie->fids[0].vnode = ino;
|
|
cookie->fids[0].unique = dtype;
|
|
cookie->found = 1;
|
|
if (cookie->one_only)
|
|
return -1;
|
|
}
|
|
|
|
ret = cookie->nr_fids >= 50 ? -1 : 0;
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Do a lookup in a directory. We make use of bulk lookup to query a slew of
|
|
* files in one go and create inodes for them. The inode of the file we were
|
|
* asked for is returned.
|
|
*/
|
|
static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
|
|
struct key *key)
|
|
{
|
|
struct afs_lookup_cookie *cookie;
|
|
struct afs_cb_interest *dcbi, *cbi = NULL;
|
|
struct afs_super_info *as = dir->i_sb->s_fs_info;
|
|
struct afs_status_cb *scb;
|
|
struct afs_iget_data iget_data;
|
|
struct afs_fs_cursor fc;
|
|
struct afs_server *server;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
|
|
struct inode *inode = NULL, *ti;
|
|
int ret, i;
|
|
|
|
_enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
|
|
|
|
cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL);
|
|
if (!cookie)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
cookie->ctx.actor = afs_lookup_filldir;
|
|
cookie->name = dentry->d_name;
|
|
cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */
|
|
|
|
read_seqlock_excl(&dvnode->cb_lock);
|
|
dcbi = rcu_dereference_protected(dvnode->cb_interest,
|
|
lockdep_is_held(&dvnode->cb_lock.lock));
|
|
if (dcbi) {
|
|
server = dcbi->server;
|
|
if (server &&
|
|
test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags))
|
|
cookie->one_only = true;
|
|
}
|
|
read_sequnlock_excl(&dvnode->cb_lock);
|
|
|
|
for (i = 0; i < 50; i++)
|
|
cookie->fids[i].vid = as->volume->vid;
|
|
|
|
/* search the directory */
|
|
ret = afs_dir_iterate(dir, &cookie->ctx, key);
|
|
if (ret < 0) {
|
|
inode = ERR_PTR(ret);
|
|
goto out;
|
|
}
|
|
|
|
inode = ERR_PTR(-ENOENT);
|
|
if (!cookie->found)
|
|
goto out;
|
|
|
|
/* Check to see if we already have an inode for the primary fid. */
|
|
iget_data.fid = cookie->fids[0];
|
|
iget_data.volume = dvnode->volume;
|
|
iget_data.cb_v_break = dvnode->volume->cb_v_break;
|
|
iget_data.cb_s_break = 0;
|
|
inode = ilookup5(dir->i_sb, cookie->fids[0].vnode,
|
|
afs_iget5_test, &iget_data);
|
|
if (inode)
|
|
goto out;
|
|
|
|
/* Need space for examining all the selected files */
|
|
inode = ERR_PTR(-ENOMEM);
|
|
cookie->statuses = kvcalloc(cookie->nr_fids, sizeof(struct afs_status_cb),
|
|
GFP_KERNEL);
|
|
if (!cookie->statuses)
|
|
goto out;
|
|
|
|
cookie->inodes = kcalloc(cookie->nr_fids, sizeof(struct inode *),
|
|
GFP_KERNEL);
|
|
if (!cookie->inodes)
|
|
goto out_s;
|
|
|
|
for (i = 1; i < cookie->nr_fids; i++) {
|
|
scb = &cookie->statuses[i];
|
|
|
|
/* Find any inodes that already exist and get their
|
|
* callback counters.
|
|
*/
|
|
iget_data.fid = cookie->fids[i];
|
|
ti = ilookup5_nowait(dir->i_sb, iget_data.fid.vnode,
|
|
afs_iget5_test, &iget_data);
|
|
if (!IS_ERR_OR_NULL(ti)) {
|
|
vnode = AFS_FS_I(ti);
|
|
scb->cb_break = afs_calc_vnode_cb_break(vnode);
|
|
cookie->inodes[i] = ti;
|
|
}
|
|
}
|
|
|
|
/* Try FS.InlineBulkStatus first. Abort codes for the individual
|
|
* lookups contained therein are stored in the reply without aborting
|
|
* the whole operation.
|
|
*/
|
|
if (cookie->one_only)
|
|
goto no_inline_bulk_status;
|
|
|
|
inode = ERR_PTR(-ERESTARTSYS);
|
|
if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
|
|
while (afs_select_fileserver(&fc)) {
|
|
if (test_bit(AFS_SERVER_FL_NO_IBULK,
|
|
&fc.cbi->server->flags)) {
|
|
fc.ac.abort_code = RX_INVALID_OPERATION;
|
|
fc.ac.error = -ECONNABORTED;
|
|
break;
|
|
}
|
|
iget_data.cb_v_break = dvnode->volume->cb_v_break;
|
|
iget_data.cb_s_break = fc.cbi->server->cb_s_break;
|
|
afs_fs_inline_bulk_status(&fc,
|
|
afs_v2net(dvnode),
|
|
cookie->fids,
|
|
cookie->statuses,
|
|
cookie->nr_fids, NULL);
|
|
}
|
|
|
|
if (fc.ac.error == 0)
|
|
cbi = afs_get_cb_interest(fc.cbi);
|
|
if (fc.ac.abort_code == RX_INVALID_OPERATION)
|
|
set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags);
|
|
inode = ERR_PTR(afs_end_vnode_operation(&fc));
|
|
}
|
|
|
|
if (!IS_ERR(inode))
|
|
goto success;
|
|
if (fc.ac.abort_code != RX_INVALID_OPERATION)
|
|
goto out_c;
|
|
|
|
no_inline_bulk_status:
|
|
/* We could try FS.BulkStatus next, but this aborts the entire op if
|
|
* any of the lookups fails - so, for the moment, revert to
|
|
* FS.FetchStatus for just the primary fid.
|
|
*/
|
|
inode = ERR_PTR(-ERESTARTSYS);
|
|
if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
|
|
while (afs_select_fileserver(&fc)) {
|
|
iget_data.cb_v_break = dvnode->volume->cb_v_break;
|
|
iget_data.cb_s_break = fc.cbi->server->cb_s_break;
|
|
scb = &cookie->statuses[0];
|
|
afs_fs_fetch_status(&fc,
|
|
afs_v2net(dvnode),
|
|
cookie->fids,
|
|
scb,
|
|
NULL);
|
|
}
|
|
|
|
if (fc.ac.error == 0)
|
|
cbi = afs_get_cb_interest(fc.cbi);
|
|
inode = ERR_PTR(afs_end_vnode_operation(&fc));
|
|
}
|
|
|
|
if (IS_ERR(inode))
|
|
goto out_c;
|
|
|
|
success:
|
|
/* Turn all the files into inodes and save the first one - which is the
|
|
* one we actually want.
|
|
*/
|
|
scb = &cookie->statuses[0];
|
|
if (scb->status.abort_code != 0)
|
|
inode = ERR_PTR(afs_abort_to_error(scb->status.abort_code));
|
|
|
|
for (i = 0; i < cookie->nr_fids; i++) {
|
|
struct afs_status_cb *scb = &cookie->statuses[i];
|
|
|
|
if (!scb->have_status && !scb->have_error)
|
|
continue;
|
|
|
|
if (cookie->inodes[i]) {
|
|
afs_vnode_commit_status(&fc, AFS_FS_I(cookie->inodes[i]),
|
|
scb->cb_break, NULL, scb);
|
|
continue;
|
|
}
|
|
|
|
if (scb->status.abort_code != 0)
|
|
continue;
|
|
|
|
iget_data.fid = cookie->fids[i];
|
|
ti = afs_iget(dir->i_sb, key, &iget_data, scb, cbi, dvnode);
|
|
if (!IS_ERR(ti))
|
|
afs_cache_permit(AFS_FS_I(ti), key,
|
|
0 /* Assume vnode->cb_break is 0 */ +
|
|
iget_data.cb_v_break,
|
|
scb);
|
|
if (i == 0) {
|
|
inode = ti;
|
|
} else {
|
|
if (!IS_ERR(ti))
|
|
iput(ti);
|
|
}
|
|
}
|
|
|
|
out_c:
|
|
afs_put_cb_interest(afs_v2net(dvnode), cbi);
|
|
if (cookie->inodes) {
|
|
for (i = 0; i < cookie->nr_fids; i++)
|
|
iput(cookie->inodes[i]);
|
|
kfree(cookie->inodes);
|
|
}
|
|
out_s:
|
|
kvfree(cookie->statuses);
|
|
out:
|
|
kfree(cookie);
|
|
return inode;
|
|
}
|
|
|
|
/*
|
|
* Look up an entry in a directory with @sys substitution.
|
|
*/
|
|
static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry,
|
|
struct key *key)
|
|
{
|
|
struct afs_sysnames *subs;
|
|
struct afs_net *net = afs_i2net(dir);
|
|
struct dentry *ret;
|
|
char *buf, *p, *name;
|
|
int len, i;
|
|
|
|
_enter("");
|
|
|
|
ret = ERR_PTR(-ENOMEM);
|
|
p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL);
|
|
if (!buf)
|
|
goto out_p;
|
|
if (dentry->d_name.len > 4) {
|
|
memcpy(p, dentry->d_name.name, dentry->d_name.len - 4);
|
|
p += dentry->d_name.len - 4;
|
|
}
|
|
|
|
/* There is an ordered list of substitutes that we have to try. */
|
|
read_lock(&net->sysnames_lock);
|
|
subs = net->sysnames;
|
|
refcount_inc(&subs->usage);
|
|
read_unlock(&net->sysnames_lock);
|
|
|
|
for (i = 0; i < subs->nr; i++) {
|
|
name = subs->subs[i];
|
|
len = dentry->d_name.len - 4 + strlen(name);
|
|
if (len >= AFSNAMEMAX) {
|
|
ret = ERR_PTR(-ENAMETOOLONG);
|
|
goto out_s;
|
|
}
|
|
|
|
strcpy(p, name);
|
|
ret = lookup_one_len(buf, dentry->d_parent, len);
|
|
if (IS_ERR(ret) || d_is_positive(ret))
|
|
goto out_s;
|
|
dput(ret);
|
|
}
|
|
|
|
/* We don't want to d_add() the @sys dentry here as we don't want to
|
|
* the cached dentry to hide changes to the sysnames list.
|
|
*/
|
|
ret = NULL;
|
|
out_s:
|
|
afs_put_sysnames(subs);
|
|
kfree(buf);
|
|
out_p:
|
|
key_put(key);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* look up an entry in a directory
|
|
*/
|
|
static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
|
|
unsigned int flags)
|
|
{
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir);
|
|
struct inode *inode;
|
|
struct dentry *d;
|
|
struct key *key;
|
|
int ret;
|
|
|
|
_enter("{%llx:%llu},%p{%pd},",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry);
|
|
|
|
ASSERTCMP(d_inode(dentry), ==, NULL);
|
|
|
|
if (dentry->d_name.len >= AFSNAMEMAX) {
|
|
_leave(" = -ENAMETOOLONG");
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
}
|
|
|
|
if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) {
|
|
_leave(" = -ESTALE");
|
|
return ERR_PTR(-ESTALE);
|
|
}
|
|
|
|
key = afs_request_key(dvnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
_leave(" = %ld [key]", PTR_ERR(key));
|
|
return ERR_CAST(key);
|
|
}
|
|
|
|
ret = afs_validate(dvnode, key);
|
|
if (ret < 0) {
|
|
key_put(key);
|
|
_leave(" = %d [val]", ret);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
if (dentry->d_name.len >= 4 &&
|
|
dentry->d_name.name[dentry->d_name.len - 4] == '@' &&
|
|
dentry->d_name.name[dentry->d_name.len - 3] == 's' &&
|
|
dentry->d_name.name[dentry->d_name.len - 2] == 'y' &&
|
|
dentry->d_name.name[dentry->d_name.len - 1] == 's')
|
|
return afs_lookup_atsys(dir, dentry, key);
|
|
|
|
afs_stat_v(dvnode, n_lookup);
|
|
inode = afs_do_lookup(dir, dentry, key);
|
|
key_put(key);
|
|
if (inode == ERR_PTR(-ENOENT)) {
|
|
inode = afs_try_auto_mntpt(dentry, dir);
|
|
} else {
|
|
dentry->d_fsdata =
|
|
(void *)(unsigned long)dvnode->status.data_version;
|
|
}
|
|
d = d_splice_alias(inode, dentry);
|
|
if (!IS_ERR_OR_NULL(d)) {
|
|
d->d_fsdata = dentry->d_fsdata;
|
|
trace_afs_lookup(dvnode, &d->d_name,
|
|
inode ? AFS_FS_I(inode) : NULL);
|
|
} else {
|
|
trace_afs_lookup(dvnode, &dentry->d_name,
|
|
inode ? AFS_FS_I(inode) : NULL);
|
|
}
|
|
return d;
|
|
}
|
|
|
|
/*
|
|
* check that a dentry lookup hit has found a valid entry
|
|
* - NOTE! the hit can be a negative hit too, so we can't assume we have an
|
|
* inode
|
|
*/
|
|
static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
|
|
{
|
|
struct afs_vnode *vnode, *dir;
|
|
struct afs_fid uninitialized_var(fid);
|
|
struct dentry *parent;
|
|
struct inode *inode;
|
|
struct key *key;
|
|
long dir_version, de_version;
|
|
int ret;
|
|
|
|
if (flags & LOOKUP_RCU)
|
|
return -ECHILD;
|
|
|
|
if (d_really_is_positive(dentry)) {
|
|
vnode = AFS_FS_I(d_inode(dentry));
|
|
_enter("{v={%llx:%llu} n=%pd fl=%lx},",
|
|
vnode->fid.vid, vnode->fid.vnode, dentry,
|
|
vnode->flags);
|
|
} else {
|
|
_enter("{neg n=%pd}", dentry);
|
|
}
|
|
|
|
key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
|
|
if (IS_ERR(key))
|
|
key = NULL;
|
|
|
|
if (d_really_is_positive(dentry)) {
|
|
inode = d_inode(dentry);
|
|
if (inode) {
|
|
vnode = AFS_FS_I(inode);
|
|
afs_validate(vnode, key);
|
|
if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
|
|
goto out_bad;
|
|
}
|
|
}
|
|
|
|
/* lock down the parent dentry so we can peer at it */
|
|
parent = dget_parent(dentry);
|
|
dir = AFS_FS_I(d_inode(parent));
|
|
|
|
/* validate the parent directory */
|
|
afs_validate(dir, key);
|
|
|
|
if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
|
|
_debug("%pd: parent dir deleted", dentry);
|
|
goto out_bad_parent;
|
|
}
|
|
|
|
/* We only need to invalidate a dentry if the server's copy changed
|
|
* behind our back. If we made the change, it's no problem. Note that
|
|
* on a 32-bit system, we only have 32 bits in the dentry to store the
|
|
* version.
|
|
*/
|
|
dir_version = (long)dir->status.data_version;
|
|
de_version = (long)dentry->d_fsdata;
|
|
if (de_version == dir_version)
|
|
goto out_valid;
|
|
|
|
dir_version = (long)dir->invalid_before;
|
|
if (de_version - dir_version >= 0)
|
|
goto out_valid;
|
|
|
|
_debug("dir modified");
|
|
afs_stat_v(dir, n_reval);
|
|
|
|
/* search the directory for this vnode */
|
|
ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key);
|
|
switch (ret) {
|
|
case 0:
|
|
/* the filename maps to something */
|
|
if (d_really_is_negative(dentry))
|
|
goto out_bad_parent;
|
|
inode = d_inode(dentry);
|
|
if (is_bad_inode(inode)) {
|
|
printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
|
|
dentry);
|
|
goto out_bad_parent;
|
|
}
|
|
|
|
vnode = AFS_FS_I(inode);
|
|
|
|
/* if the vnode ID has changed, then the dirent points to a
|
|
* different file */
|
|
if (fid.vnode != vnode->fid.vnode) {
|
|
_debug("%pd: dirent changed [%llu != %llu]",
|
|
dentry, fid.vnode,
|
|
vnode->fid.vnode);
|
|
goto not_found;
|
|
}
|
|
|
|
/* if the vnode ID uniqifier has changed, then the file has
|
|
* been deleted and replaced, and the original vnode ID has
|
|
* been reused */
|
|
if (fid.unique != vnode->fid.unique) {
|
|
_debug("%pd: file deleted (uq %u -> %u I:%u)",
|
|
dentry, fid.unique,
|
|
vnode->fid.unique,
|
|
vnode->vfs_inode.i_generation);
|
|
write_seqlock(&vnode->cb_lock);
|
|
set_bit(AFS_VNODE_DELETED, &vnode->flags);
|
|
write_sequnlock(&vnode->cb_lock);
|
|
goto not_found;
|
|
}
|
|
goto out_valid;
|
|
|
|
case -ENOENT:
|
|
/* the filename is unknown */
|
|
_debug("%pd: dirent not found", dentry);
|
|
if (d_really_is_positive(dentry))
|
|
goto not_found;
|
|
goto out_valid;
|
|
|
|
default:
|
|
_debug("failed to iterate dir %pd: %d",
|
|
parent, ret);
|
|
goto out_bad_parent;
|
|
}
|
|
|
|
out_valid:
|
|
dentry->d_fsdata = (void *)dir_version;
|
|
dput(parent);
|
|
key_put(key);
|
|
_leave(" = 1 [valid]");
|
|
return 1;
|
|
|
|
/* the dirent, if it exists, now points to a different vnode */
|
|
not_found:
|
|
spin_lock(&dentry->d_lock);
|
|
dentry->d_flags |= DCACHE_NFSFS_RENAMED;
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
out_bad_parent:
|
|
_debug("dropping dentry %pd2", dentry);
|
|
dput(parent);
|
|
out_bad:
|
|
key_put(key);
|
|
|
|
_leave(" = 0 [bad]");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
|
|
* sleep)
|
|
* - called from dput() when d_count is going to 0.
|
|
* - return 1 to request dentry be unhashed, 0 otherwise
|
|
*/
|
|
static int afs_d_delete(const struct dentry *dentry)
|
|
{
|
|
_enter("%pd", dentry);
|
|
|
|
if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
|
|
goto zap;
|
|
|
|
if (d_really_is_positive(dentry) &&
|
|
(test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) ||
|
|
test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
|
|
goto zap;
|
|
|
|
_leave(" = 0 [keep]");
|
|
return 0;
|
|
|
|
zap:
|
|
_leave(" = 1 [zap]");
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Clean up sillyrename files on dentry removal.
|
|
*/
|
|
static void afs_d_iput(struct dentry *dentry, struct inode *inode)
|
|
{
|
|
if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
|
|
afs_silly_iput(dentry, inode);
|
|
iput(inode);
|
|
}
|
|
|
|
/*
|
|
* handle dentry release
|
|
*/
|
|
void afs_d_release(struct dentry *dentry)
|
|
{
|
|
_enter("%pd", dentry);
|
|
}
|
|
|
|
/*
|
|
* Create a new inode for create/mkdir/symlink
|
|
*/
|
|
static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
|
|
struct dentry *new_dentry,
|
|
struct afs_iget_data *new_data,
|
|
struct afs_status_cb *new_scb)
|
|
{
|
|
struct afs_vnode *vnode;
|
|
struct inode *inode;
|
|
|
|
if (fc->ac.error < 0)
|
|
return;
|
|
|
|
inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key,
|
|
new_data, new_scb, fc->cbi, fc->vnode);
|
|
if (IS_ERR(inode)) {
|
|
/* ENOMEM or EINTR at a really inconvenient time - just abandon
|
|
* the new directory on the server.
|
|
*/
|
|
fc->ac.error = PTR_ERR(inode);
|
|
return;
|
|
}
|
|
|
|
vnode = AFS_FS_I(inode);
|
|
set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
|
|
if (fc->ac.error == 0)
|
|
afs_cache_permit(vnode, fc->key, vnode->cb_break, new_scb);
|
|
d_instantiate(new_dentry, inode);
|
|
}
|
|
|
|
static void afs_prep_for_new_inode(struct afs_fs_cursor *fc,
|
|
struct afs_iget_data *iget_data)
|
|
{
|
|
iget_data->volume = fc->vnode->volume;
|
|
iget_data->cb_v_break = fc->vnode->volume->cb_v_break;
|
|
iget_data->cb_s_break = fc->cbi->server->cb_s_break;
|
|
}
|
|
|
|
/*
|
|
* create a directory on an AFS filesystem
|
|
*/
|
|
static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
|
|
{
|
|
struct afs_iget_data iget_data;
|
|
struct afs_status_cb *scb;
|
|
struct afs_fs_cursor fc;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir);
|
|
struct key *key;
|
|
int ret;
|
|
|
|
mode |= S_IFDIR;
|
|
|
|
_enter("{%llx:%llu},{%pd},%ho",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
|
|
|
|
ret = -ENOMEM;
|
|
scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
|
|
if (!scb)
|
|
goto error;
|
|
|
|
key = afs_request_key(dvnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
ret = PTR_ERR(key);
|
|
goto error_scb;
|
|
}
|
|
|
|
ret = -ERESTARTSYS;
|
|
if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
|
|
afs_dataversion_t data_version = dvnode->status.data_version + 1;
|
|
|
|
while (afs_select_fileserver(&fc)) {
|
|
fc.cb_break = afs_calc_vnode_cb_break(dvnode);
|
|
afs_prep_for_new_inode(&fc, &iget_data);
|
|
afs_fs_create(&fc, dentry->d_name.name, mode,
|
|
&scb[0], &iget_data.fid, &scb[1]);
|
|
}
|
|
|
|
afs_check_for_remote_deletion(&fc, dvnode);
|
|
afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
|
|
&data_version, &scb[0]);
|
|
afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]);
|
|
ret = afs_end_vnode_operation(&fc);
|
|
if (ret < 0)
|
|
goto error_key;
|
|
} else {
|
|
goto error_key;
|
|
}
|
|
|
|
if (ret == 0 &&
|
|
test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
|
|
afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid,
|
|
afs_edit_dir_for_create);
|
|
|
|
key_put(key);
|
|
kfree(scb);
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
error_key:
|
|
key_put(key);
|
|
error_scb:
|
|
kfree(scb);
|
|
error:
|
|
d_drop(dentry);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Remove a subdir from a directory.
|
|
*/
|
|
static void afs_dir_remove_subdir(struct dentry *dentry)
|
|
{
|
|
if (d_really_is_positive(dentry)) {
|
|
struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
|
|
|
|
clear_nlink(&vnode->vfs_inode);
|
|
set_bit(AFS_VNODE_DELETED, &vnode->flags);
|
|
clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
|
|
clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* remove a directory from an AFS filesystem
|
|
*/
|
|
static int afs_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct afs_status_cb *scb;
|
|
struct afs_fs_cursor fc;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
|
|
struct key *key;
|
|
int ret;
|
|
|
|
_enter("{%llx:%llu},{%pd}",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry);
|
|
|
|
scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL);
|
|
if (!scb)
|
|
return -ENOMEM;
|
|
|
|
key = afs_request_key(dvnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
ret = PTR_ERR(key);
|
|
goto error;
|
|
}
|
|
|
|
/* Try to make sure we have a callback promise on the victim. */
|
|
if (d_really_is_positive(dentry)) {
|
|
vnode = AFS_FS_I(d_inode(dentry));
|
|
ret = afs_validate(vnode, key);
|
|
if (ret < 0)
|
|
goto error_key;
|
|
}
|
|
|
|
if (vnode) {
|
|
ret = down_write_killable(&vnode->rmdir_lock);
|
|
if (ret < 0)
|
|
goto error_key;
|
|
}
|
|
|
|
ret = -ERESTARTSYS;
|
|
if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
|
|
afs_dataversion_t data_version = dvnode->status.data_version + 1;
|
|
|
|
while (afs_select_fileserver(&fc)) {
|
|
fc.cb_break = afs_calc_vnode_cb_break(dvnode);
|
|
afs_fs_remove(&fc, vnode, dentry->d_name.name, true, scb);
|
|
}
|
|
|
|
afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
|
|
&data_version, scb);
|
|
ret = afs_end_vnode_operation(&fc);
|
|
if (ret == 0) {
|
|
afs_dir_remove_subdir(dentry);
|
|
if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
|
|
afs_edit_dir_remove(dvnode, &dentry->d_name,
|
|
afs_edit_dir_for_rmdir);
|
|
}
|
|
}
|
|
|
|
if (vnode)
|
|
up_write(&vnode->rmdir_lock);
|
|
error_key:
|
|
key_put(key);
|
|
error:
|
|
kfree(scb);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Remove a link to a file or symlink from a directory.
|
|
*
|
|
* If the file was not deleted due to excess hard links, the fileserver will
|
|
* break the callback promise on the file - if it had one - before it returns
|
|
* to us, and if it was deleted, it won't
|
|
*
|
|
* However, if we didn't have a callback promise outstanding, or it was
|
|
* outstanding on a different server, then it won't break it either...
|
|
*/
|
|
static int afs_dir_remove_link(struct afs_vnode *dvnode, struct dentry *dentry,
|
|
struct key *key)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (d_really_is_positive(dentry)) {
|
|
struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
|
|
|
|
if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
|
|
/* Already done */
|
|
} else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
|
|
write_seqlock(&vnode->cb_lock);
|
|
drop_nlink(&vnode->vfs_inode);
|
|
if (vnode->vfs_inode.i_nlink == 0) {
|
|
set_bit(AFS_VNODE_DELETED, &vnode->flags);
|
|
__afs_break_callback(vnode);
|
|
}
|
|
write_sequnlock(&vnode->cb_lock);
|
|
ret = 0;
|
|
} else {
|
|
afs_break_callback(vnode);
|
|
|
|
if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
|
|
kdebug("AFS_VNODE_DELETED");
|
|
|
|
ret = afs_validate(vnode, key);
|
|
if (ret == -ESTALE)
|
|
ret = 0;
|
|
}
|
|
_debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Remove a file or symlink from an AFS filesystem.
|
|
*/
|
|
static int afs_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct afs_fs_cursor fc;
|
|
struct afs_status_cb *scb;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
|
|
struct key *key;
|
|
bool need_rehash = false;
|
|
int ret;
|
|
|
|
_enter("{%llx:%llu},{%pd}",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry);
|
|
|
|
if (dentry->d_name.len >= AFSNAMEMAX)
|
|
return -ENAMETOOLONG;
|
|
|
|
ret = -ENOMEM;
|
|
scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
|
|
if (!scb)
|
|
goto error;
|
|
|
|
key = afs_request_key(dvnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
ret = PTR_ERR(key);
|
|
goto error_scb;
|
|
}
|
|
|
|
/* Try to make sure we have a callback promise on the victim. */
|
|
if (d_really_is_positive(dentry)) {
|
|
vnode = AFS_FS_I(d_inode(dentry));
|
|
ret = afs_validate(vnode, key);
|
|
if (ret < 0)
|
|
goto error_key;
|
|
}
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
if (vnode && d_count(dentry) > 1) {
|
|
spin_unlock(&dentry->d_lock);
|
|
/* Start asynchronous writeout of the inode */
|
|
write_inode_now(d_inode(dentry), 0);
|
|
ret = afs_sillyrename(dvnode, vnode, dentry, key);
|
|
goto error_key;
|
|
}
|
|
if (!d_unhashed(dentry)) {
|
|
/* Prevent a race with RCU lookup. */
|
|
__d_drop(dentry);
|
|
need_rehash = true;
|
|
}
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
ret = -ERESTARTSYS;
|
|
if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
|
|
afs_dataversion_t data_version = dvnode->status.data_version + 1;
|
|
afs_dataversion_t data_version_2 = vnode->status.data_version;
|
|
|
|
while (afs_select_fileserver(&fc)) {
|
|
fc.cb_break = afs_calc_vnode_cb_break(dvnode);
|
|
fc.cb_break_2 = afs_calc_vnode_cb_break(vnode);
|
|
|
|
if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) &&
|
|
!test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) {
|
|
yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name,
|
|
&scb[0], &scb[1]);
|
|
if (fc.ac.error != -ECONNABORTED ||
|
|
fc.ac.abort_code != RXGEN_OPCODE)
|
|
continue;
|
|
set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags);
|
|
}
|
|
|
|
afs_fs_remove(&fc, vnode, dentry->d_name.name, false, &scb[0]);
|
|
}
|
|
|
|
afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
|
|
&data_version, &scb[0]);
|
|
afs_vnode_commit_status(&fc, vnode, fc.cb_break_2,
|
|
&data_version_2, &scb[1]);
|
|
ret = afs_end_vnode_operation(&fc);
|
|
if (ret == 0 && !(scb[1].have_status || scb[1].have_error))
|
|
ret = afs_dir_remove_link(dvnode, dentry, key);
|
|
if (ret == 0 &&
|
|
test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
|
|
afs_edit_dir_remove(dvnode, &dentry->d_name,
|
|
afs_edit_dir_for_unlink);
|
|
}
|
|
|
|
if (need_rehash && ret < 0 && ret != -ENOENT)
|
|
d_rehash(dentry);
|
|
|
|
error_key:
|
|
key_put(key);
|
|
error_scb:
|
|
kfree(scb);
|
|
error:
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* create a regular file on an AFS filesystem
|
|
*/
|
|
static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
|
|
bool excl)
|
|
{
|
|
struct afs_iget_data iget_data;
|
|
struct afs_fs_cursor fc;
|
|
struct afs_status_cb *scb;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir);
|
|
struct key *key;
|
|
int ret;
|
|
|
|
mode |= S_IFREG;
|
|
|
|
_enter("{%llx:%llu},{%pd},%ho,",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
|
|
|
|
ret = -ENAMETOOLONG;
|
|
if (dentry->d_name.len >= AFSNAMEMAX)
|
|
goto error;
|
|
|
|
key = afs_request_key(dvnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
ret = PTR_ERR(key);
|
|
goto error;
|
|
}
|
|
|
|
ret = -ENOMEM;
|
|
scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
|
|
if (!scb)
|
|
goto error_scb;
|
|
|
|
ret = -ERESTARTSYS;
|
|
if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
|
|
afs_dataversion_t data_version = dvnode->status.data_version + 1;
|
|
|
|
while (afs_select_fileserver(&fc)) {
|
|
fc.cb_break = afs_calc_vnode_cb_break(dvnode);
|
|
afs_prep_for_new_inode(&fc, &iget_data);
|
|
afs_fs_create(&fc, dentry->d_name.name, mode,
|
|
&scb[0], &iget_data.fid, &scb[1]);
|
|
}
|
|
|
|
afs_check_for_remote_deletion(&fc, dvnode);
|
|
afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
|
|
&data_version, &scb[0]);
|
|
afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]);
|
|
ret = afs_end_vnode_operation(&fc);
|
|
if (ret < 0)
|
|
goto error_key;
|
|
} else {
|
|
goto error_key;
|
|
}
|
|
|
|
if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
|
|
afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid,
|
|
afs_edit_dir_for_create);
|
|
|
|
kfree(scb);
|
|
key_put(key);
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
error_scb:
|
|
kfree(scb);
|
|
error_key:
|
|
key_put(key);
|
|
error:
|
|
d_drop(dentry);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* create a hard link between files in an AFS filesystem
|
|
*/
|
|
static int afs_link(struct dentry *from, struct inode *dir,
|
|
struct dentry *dentry)
|
|
{
|
|
struct afs_fs_cursor fc;
|
|
struct afs_status_cb *scb;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir);
|
|
struct afs_vnode *vnode = AFS_FS_I(d_inode(from));
|
|
struct key *key;
|
|
int ret;
|
|
|
|
_enter("{%llx:%llu},{%llx:%llu},{%pd}",
|
|
vnode->fid.vid, vnode->fid.vnode,
|
|
dvnode->fid.vid, dvnode->fid.vnode,
|
|
dentry);
|
|
|
|
ret = -ENAMETOOLONG;
|
|
if (dentry->d_name.len >= AFSNAMEMAX)
|
|
goto error;
|
|
|
|
ret = -ENOMEM;
|
|
scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
|
|
if (!scb)
|
|
goto error;
|
|
|
|
key = afs_request_key(dvnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
ret = PTR_ERR(key);
|
|
goto error_scb;
|
|
}
|
|
|
|
ret = -ERESTARTSYS;
|
|
if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
|
|
afs_dataversion_t data_version = dvnode->status.data_version + 1;
|
|
|
|
if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) {
|
|
afs_end_vnode_operation(&fc);
|
|
goto error_key;
|
|
}
|
|
|
|
while (afs_select_fileserver(&fc)) {
|
|
fc.cb_break = afs_calc_vnode_cb_break(dvnode);
|
|
fc.cb_break_2 = afs_calc_vnode_cb_break(vnode);
|
|
afs_fs_link(&fc, vnode, dentry->d_name.name,
|
|
&scb[0], &scb[1]);
|
|
}
|
|
|
|
afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
|
|
&data_version, &scb[0]);
|
|
afs_vnode_commit_status(&fc, vnode, fc.cb_break_2,
|
|
NULL, &scb[1]);
|
|
ihold(&vnode->vfs_inode);
|
|
d_instantiate(dentry, &vnode->vfs_inode);
|
|
|
|
mutex_unlock(&vnode->io_lock);
|
|
ret = afs_end_vnode_operation(&fc);
|
|
if (ret < 0)
|
|
goto error_key;
|
|
} else {
|
|
goto error_key;
|
|
}
|
|
|
|
if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
|
|
afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid,
|
|
afs_edit_dir_for_link);
|
|
|
|
key_put(key);
|
|
kfree(scb);
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
error_key:
|
|
key_put(key);
|
|
error_scb:
|
|
kfree(scb);
|
|
error:
|
|
d_drop(dentry);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* create a symlink in an AFS filesystem
|
|
*/
|
|
static int afs_symlink(struct inode *dir, struct dentry *dentry,
|
|
const char *content)
|
|
{
|
|
struct afs_iget_data iget_data;
|
|
struct afs_fs_cursor fc;
|
|
struct afs_status_cb *scb;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir);
|
|
struct key *key;
|
|
int ret;
|
|
|
|
_enter("{%llx:%llu},{%pd},%s",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry,
|
|
content);
|
|
|
|
ret = -ENAMETOOLONG;
|
|
if (dentry->d_name.len >= AFSNAMEMAX)
|
|
goto error;
|
|
|
|
ret = -EINVAL;
|
|
if (strlen(content) >= AFSPATHMAX)
|
|
goto error;
|
|
|
|
ret = -ENOMEM;
|
|
scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
|
|
if (!scb)
|
|
goto error;
|
|
|
|
key = afs_request_key(dvnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
ret = PTR_ERR(key);
|
|
goto error_scb;
|
|
}
|
|
|
|
ret = -ERESTARTSYS;
|
|
if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
|
|
afs_dataversion_t data_version = dvnode->status.data_version + 1;
|
|
|
|
while (afs_select_fileserver(&fc)) {
|
|
fc.cb_break = afs_calc_vnode_cb_break(dvnode);
|
|
afs_prep_for_new_inode(&fc, &iget_data);
|
|
afs_fs_symlink(&fc, dentry->d_name.name, content,
|
|
&scb[0], &iget_data.fid, &scb[1]);
|
|
}
|
|
|
|
afs_check_for_remote_deletion(&fc, dvnode);
|
|
afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
|
|
&data_version, &scb[0]);
|
|
afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]);
|
|
ret = afs_end_vnode_operation(&fc);
|
|
if (ret < 0)
|
|
goto error_key;
|
|
} else {
|
|
goto error_key;
|
|
}
|
|
|
|
if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
|
|
afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid,
|
|
afs_edit_dir_for_symlink);
|
|
|
|
key_put(key);
|
|
kfree(scb);
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
error_key:
|
|
key_put(key);
|
|
error_scb:
|
|
kfree(scb);
|
|
error:
|
|
d_drop(dentry);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* rename a file in an AFS filesystem and/or move it between directories
|
|
*/
|
|
static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry,
|
|
unsigned int flags)
|
|
{
|
|
struct afs_fs_cursor fc;
|
|
struct afs_status_cb *scb;
|
|
struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
|
|
struct dentry *tmp = NULL, *rehash = NULL;
|
|
struct inode *new_inode;
|
|
struct key *key;
|
|
bool new_negative = d_is_negative(new_dentry);
|
|
int ret;
|
|
|
|
if (flags)
|
|
return -EINVAL;
|
|
|
|
/* Don't allow silly-rename files be moved around. */
|
|
if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED)
|
|
return -EINVAL;
|
|
|
|
vnode = AFS_FS_I(d_inode(old_dentry));
|
|
orig_dvnode = AFS_FS_I(old_dir);
|
|
new_dvnode = AFS_FS_I(new_dir);
|
|
|
|
_enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}",
|
|
orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
|
|
vnode->fid.vid, vnode->fid.vnode,
|
|
new_dvnode->fid.vid, new_dvnode->fid.vnode,
|
|
new_dentry);
|
|
|
|
ret = -ENOMEM;
|
|
scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
|
|
if (!scb)
|
|
goto error;
|
|
|
|
key = afs_request_key(orig_dvnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
ret = PTR_ERR(key);
|
|
goto error_scb;
|
|
}
|
|
|
|
/* For non-directories, check whether the target is busy and if so,
|
|
* make a copy of the dentry and then do a silly-rename. If the
|
|
* silly-rename succeeds, the copied dentry is hashed and becomes the
|
|
* new target.
|
|
*/
|
|
if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) {
|
|
/* To prevent any new references to the target during the
|
|
* rename, we unhash the dentry in advance.
|
|
*/
|
|
if (!d_unhashed(new_dentry)) {
|
|
d_drop(new_dentry);
|
|
rehash = new_dentry;
|
|
}
|
|
|
|
if (d_count(new_dentry) > 2) {
|
|
/* copy the target dentry's name */
|
|
ret = -ENOMEM;
|
|
tmp = d_alloc(new_dentry->d_parent,
|
|
&new_dentry->d_name);
|
|
if (!tmp)
|
|
goto error_rehash;
|
|
|
|
ret = afs_sillyrename(new_dvnode,
|
|
AFS_FS_I(d_inode(new_dentry)),
|
|
new_dentry, key);
|
|
if (ret)
|
|
goto error_rehash;
|
|
|
|
new_dentry = tmp;
|
|
rehash = NULL;
|
|
new_negative = true;
|
|
}
|
|
}
|
|
|
|
ret = -ERESTARTSYS;
|
|
if (afs_begin_vnode_operation(&fc, orig_dvnode, key, true)) {
|
|
afs_dataversion_t orig_data_version;
|
|
afs_dataversion_t new_data_version;
|
|
struct afs_status_cb *new_scb = &scb[1];
|
|
|
|
orig_data_version = orig_dvnode->status.data_version + 1;
|
|
|
|
if (orig_dvnode != new_dvnode) {
|
|
if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) {
|
|
afs_end_vnode_operation(&fc);
|
|
goto error_rehash;
|
|
}
|
|
new_data_version = new_dvnode->status.data_version;
|
|
} else {
|
|
new_data_version = orig_data_version;
|
|
new_scb = &scb[0];
|
|
}
|
|
|
|
while (afs_select_fileserver(&fc)) {
|
|
fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode);
|
|
fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode);
|
|
afs_fs_rename(&fc, old_dentry->d_name.name,
|
|
new_dvnode, new_dentry->d_name.name,
|
|
&scb[0], new_scb);
|
|
}
|
|
|
|
afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break,
|
|
&orig_data_version, &scb[0]);
|
|
if (new_dvnode != orig_dvnode) {
|
|
afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2,
|
|
&new_data_version, &scb[1]);
|
|
mutex_unlock(&new_dvnode->io_lock);
|
|
}
|
|
ret = afs_end_vnode_operation(&fc);
|
|
if (ret < 0)
|
|
goto error_rehash;
|
|
}
|
|
|
|
if (ret == 0) {
|
|
if (rehash)
|
|
d_rehash(rehash);
|
|
if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags))
|
|
afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
|
|
afs_edit_dir_for_rename_0);
|
|
|
|
if (!new_negative &&
|
|
test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags))
|
|
afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
|
|
afs_edit_dir_for_rename_1);
|
|
|
|
if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags))
|
|
afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
|
|
&vnode->fid, afs_edit_dir_for_rename_2);
|
|
|
|
new_inode = d_inode(new_dentry);
|
|
if (new_inode) {
|
|
spin_lock(&new_inode->i_lock);
|
|
if (new_inode->i_nlink > 0)
|
|
drop_nlink(new_inode);
|
|
spin_unlock(&new_inode->i_lock);
|
|
}
|
|
d_move(old_dentry, new_dentry);
|
|
goto error_tmp;
|
|
}
|
|
|
|
error_rehash:
|
|
if (rehash)
|
|
d_rehash(rehash);
|
|
error_tmp:
|
|
if (tmp)
|
|
dput(tmp);
|
|
key_put(key);
|
|
error_scb:
|
|
kfree(scb);
|
|
error:
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Release a directory page and clean up its private state if it's not busy
|
|
* - return true if the page can now be released, false if not
|
|
*/
|
|
static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags)
|
|
{
|
|
struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
|
|
|
|
_enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index);
|
|
|
|
set_page_private(page, 0);
|
|
ClearPagePrivate(page);
|
|
|
|
/* The directory will need reloading. */
|
|
if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
|
|
afs_stat_v(dvnode, n_relpg);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* invalidate part or all of a page
|
|
* - release a page and clean up its private data if offset is 0 (indicating
|
|
* the entire page)
|
|
*/
|
|
static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
|
|
unsigned int length)
|
|
{
|
|
struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
|
|
|
|
_enter("{%lu},%u,%u", page->index, offset, length);
|
|
|
|
BUG_ON(!PageLocked(page));
|
|
|
|
/* The directory will need reloading. */
|
|
if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
|
|
afs_stat_v(dvnode, n_inval);
|
|
|
|
/* we clean up only if the entire page is being invalidated */
|
|
if (offset == 0 && length == PAGE_SIZE) {
|
|
set_page_private(page, 0);
|
|
ClearPagePrivate(page);
|
|
}
|
|
}
|