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![Christian Brauner](/assets/img/avatar_default.png)
Extend some inode methods with an additional user namespace argument. A filesystem that is aware of idmapped mounts will receive the user namespace the mount has been marked with. This can be used for additional permission checking and also to enable filesystems to translate between uids and gids if they need to. We have implemented all relevant helpers in earlier patches. As requested we simply extend the exisiting inode method instead of introducing new ones. This is a little more code churn but it's mostly mechanical and doesnt't leave us with additional inode methods. Link: https://lore.kernel.org/r/20210121131959.646623-25-christian.brauner@ubuntu.com Cc: Christoph Hellwig <hch@lst.de> Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
2012 lines
52 KiB
C
2012 lines
52 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* 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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#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 user_namespace *mnt_userns, struct inode *dir,
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struct dentry *dentry, umode_t mode, bool excl);
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static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
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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 user_namespace *mnt_userns, struct inode *dir,
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struct dentry *dentry, const char *content);
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static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
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struct dentry *old_dentry, struct inode *new_dir,
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struct dentry *new_dentry, 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 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(struct_size(req, array, nr_inline), 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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attach_page_private(req->pages[i], (void *)1);
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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, nr_slots;
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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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/* 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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next = offset + 1;
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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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if (nlen > AFSNAMEMAX - 1) {
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_debug("ENT[%zu]: name too long (len %u/%zu)",
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blkoff / sizeof(union afs_xdr_dir_block),
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offset, nlen);
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return afs_bad(dvnode, afs_file_error_dir_name_too_long);
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}
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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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nr_slots = afs_dir_calc_slots(nlen);
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next = offset + nr_slots;
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if (next > AFS_DIR_SLOTS_PER_BLOCK) {
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_debug("ENT[%zu.%u]:"
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" %u extends beyond end dir block"
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" (len %zu)",
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blkoff / sizeof(union afs_xdr_dir_block),
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offset, next, nlen);
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return afs_bad(dvnode, afs_file_error_dir_over_end);
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}
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/* Check that the name-extension dirents are all allocated */
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for (tmp = 1; tmp < nr_slots; tmp++) {
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unsigned int ix = offset + tmp;
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if (!(block->hdr.bitmap[ix / 8] & (1 << (ix % 8)))) {
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_debug("ENT[%zu.u]:"
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" %u unmarked extension (%u/%u)",
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blkoff / sizeof(union afs_xdr_dir_block),
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offset, tmp, nr_slots);
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return afs_bad(dvnode, afs_file_error_dir_unmarked_ext);
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}
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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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/* 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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* 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, afs_dataversion_t *_dir_version)
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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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|
|
req = afs_read_dir(dvnode, key);
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
*_dir_version = req->data_version;
|
|
|
|
/* round the file position up to the next entry boundary */
|
|
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)
|
|
{
|
|
afs_dataversion_t dir_version;
|
|
|
|
return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file),
|
|
&dir_version);
|
|
}
|
|
|
|
/*
|
|
* 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,
|
|
afs_dataversion_t *_dir_version)
|
|
{
|
|
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, _dir_version);
|
|
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[1].vnode = ino;
|
|
cookie->fids[1].unique = dtype;
|
|
cookie->found = 1;
|
|
if (cookie->one_only)
|
|
return -1;
|
|
}
|
|
|
|
ret = cookie->nr_fids >= 50 ? -1 : 0;
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Deal with the result of a successful lookup operation. Turn all the files
|
|
* into inodes and save the first one - which is the one we actually want.
|
|
*/
|
|
static void afs_do_lookup_success(struct afs_operation *op)
|
|
{
|
|
struct afs_vnode_param *vp;
|
|
struct afs_vnode *vnode;
|
|
struct inode *inode;
|
|
u32 abort_code;
|
|
int i;
|
|
|
|
_enter("");
|
|
|
|
for (i = 0; i < op->nr_files; i++) {
|
|
switch (i) {
|
|
case 0:
|
|
vp = &op->file[0];
|
|
abort_code = vp->scb.status.abort_code;
|
|
if (abort_code != 0) {
|
|
op->ac.abort_code = abort_code;
|
|
op->error = afs_abort_to_error(abort_code);
|
|
}
|
|
break;
|
|
|
|
case 1:
|
|
vp = &op->file[1];
|
|
break;
|
|
|
|
default:
|
|
vp = &op->more_files[i - 2];
|
|
break;
|
|
}
|
|
|
|
if (!vp->scb.have_status && !vp->scb.have_error)
|
|
continue;
|
|
|
|
_debug("do [%u]", i);
|
|
if (vp->vnode) {
|
|
if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags))
|
|
afs_vnode_commit_status(op, vp);
|
|
} else if (vp->scb.status.abort_code == 0) {
|
|
inode = afs_iget(op, vp);
|
|
if (!IS_ERR(inode)) {
|
|
vnode = AFS_FS_I(inode);
|
|
afs_cache_permit(vnode, op->key,
|
|
0 /* Assume vnode->cb_break is 0 */ +
|
|
op->cb_v_break,
|
|
&vp->scb);
|
|
vp->vnode = vnode;
|
|
vp->put_vnode = true;
|
|
}
|
|
} else {
|
|
_debug("- abort %d %llx:%llx.%x",
|
|
vp->scb.status.abort_code,
|
|
vp->fid.vid, vp->fid.vnode, vp->fid.unique);
|
|
}
|
|
}
|
|
|
|
_leave("");
|
|
}
|
|
|
|
static const struct afs_operation_ops afs_inline_bulk_status_operation = {
|
|
.issue_afs_rpc = afs_fs_inline_bulk_status,
|
|
.issue_yfs_rpc = yfs_fs_inline_bulk_status,
|
|
.success = afs_do_lookup_success,
|
|
};
|
|
|
|
static const struct afs_operation_ops afs_lookup_fetch_status_operation = {
|
|
.issue_afs_rpc = afs_fs_fetch_status,
|
|
.issue_yfs_rpc = yfs_fs_fetch_status,
|
|
.success = afs_do_lookup_success,
|
|
.aborted = afs_check_for_remote_deletion,
|
|
};
|
|
|
|
/*
|
|
* See if we know that the server we expect to use doesn't support
|
|
* FS.InlineBulkStatus.
|
|
*/
|
|
static bool afs_server_supports_ibulk(struct afs_vnode *dvnode)
|
|
{
|
|
struct afs_server_list *slist;
|
|
struct afs_volume *volume = dvnode->volume;
|
|
struct afs_server *server;
|
|
bool ret = true;
|
|
int i;
|
|
|
|
if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags))
|
|
return true;
|
|
|
|
rcu_read_lock();
|
|
slist = rcu_dereference(volume->servers);
|
|
|
|
for (i = 0; i < slist->nr_servers; i++) {
|
|
server = slist->servers[i].server;
|
|
if (server == dvnode->cb_server) {
|
|
if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags))
|
|
ret = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
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_vnode_param *vp;
|
|
struct afs_operation *op;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
|
|
struct inode *inode = NULL, *ti;
|
|
afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version);
|
|
long ret;
|
|
int 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);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(cookie->fids); i++)
|
|
cookie->fids[i].vid = dvnode->fid.vid;
|
|
cookie->ctx.actor = afs_lookup_filldir;
|
|
cookie->name = dentry->d_name;
|
|
cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want
|
|
* and slot 1 for the directory */
|
|
|
|
if (!afs_server_supports_ibulk(dvnode))
|
|
cookie->one_only = true;
|
|
|
|
/* search the directory */
|
|
ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
dentry->d_fsdata = (void *)(unsigned long)data_version;
|
|
|
|
ret = -ENOENT;
|
|
if (!cookie->found)
|
|
goto out;
|
|
|
|
/* Check to see if we already have an inode for the primary fid. */
|
|
inode = ilookup5(dir->i_sb, cookie->fids[1].vnode,
|
|
afs_ilookup5_test_by_fid, &cookie->fids[1]);
|
|
if (inode)
|
|
goto out; /* We do */
|
|
|
|
/* Okay, we didn't find it. We need to query the server - and whilst
|
|
* we're doing that, we're going to attempt to look up a bunch of other
|
|
* vnodes also.
|
|
*/
|
|
op = afs_alloc_operation(NULL, dvnode->volume);
|
|
if (IS_ERR(op)) {
|
|
ret = PTR_ERR(op);
|
|
goto out;
|
|
}
|
|
|
|
afs_op_set_vnode(op, 0, dvnode);
|
|
afs_op_set_fid(op, 1, &cookie->fids[1]);
|
|
|
|
op->nr_files = cookie->nr_fids;
|
|
_debug("nr_files %u", op->nr_files);
|
|
|
|
/* Need space for examining all the selected files */
|
|
op->error = -ENOMEM;
|
|
if (op->nr_files > 2) {
|
|
op->more_files = kvcalloc(op->nr_files - 2,
|
|
sizeof(struct afs_vnode_param),
|
|
GFP_KERNEL);
|
|
if (!op->more_files)
|
|
goto out_op;
|
|
|
|
for (i = 2; i < op->nr_files; i++) {
|
|
vp = &op->more_files[i - 2];
|
|
vp->fid = cookie->fids[i];
|
|
|
|
/* Find any inodes that already exist and get their
|
|
* callback counters.
|
|
*/
|
|
ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode,
|
|
afs_ilookup5_test_by_fid, &vp->fid);
|
|
if (!IS_ERR_OR_NULL(ti)) {
|
|
vnode = AFS_FS_I(ti);
|
|
vp->dv_before = vnode->status.data_version;
|
|
vp->cb_break_before = afs_calc_vnode_cb_break(vnode);
|
|
vp->vnode = vnode;
|
|
vp->put_vnode = true;
|
|
vp->speculative = true; /* vnode not locked */
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Try FS.InlineBulkStatus first. Abort codes for the individual
|
|
* lookups contained therein are stored in the reply without aborting
|
|
* the whole operation.
|
|
*/
|
|
op->error = -ENOTSUPP;
|
|
if (!cookie->one_only) {
|
|
op->ops = &afs_inline_bulk_status_operation;
|
|
afs_begin_vnode_operation(op);
|
|
afs_wait_for_operation(op);
|
|
}
|
|
|
|
if (op->error == -ENOTSUPP) {
|
|
/* 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 op->file[1].
|
|
*/
|
|
op->fetch_status.which = 1;
|
|
op->ops = &afs_lookup_fetch_status_operation;
|
|
afs_begin_vnode_operation(op);
|
|
afs_wait_for_operation(op);
|
|
}
|
|
inode = ERR_PTR(op->error);
|
|
|
|
out_op:
|
|
if (op->error == 0) {
|
|
inode = &op->file[1].vnode->vfs_inode;
|
|
op->file[1].vnode = NULL;
|
|
}
|
|
|
|
if (op->file[0].scb.have_status)
|
|
dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version;
|
|
else
|
|
dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before;
|
|
ret = afs_put_operation(op);
|
|
out:
|
|
kfree(cookie);
|
|
_leave("");
|
|
return inode ?: ERR_PTR(ret);
|
|
}
|
|
|
|
/*
|
|
* 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 afs_fid fid = {};
|
|
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);
|
|
|
|
if (!IS_ERR_OR_NULL(inode))
|
|
fid = AFS_FS_I(inode)->fid;
|
|
|
|
_debug("splice %p", dentry->d_inode);
|
|
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, &fid);
|
|
} else {
|
|
trace_afs_lookup(dvnode, &dentry->d_name, &fid);
|
|
}
|
|
_leave("");
|
|
return d;
|
|
}
|
|
|
|
/*
|
|
* Check the validity of a dentry under RCU conditions.
|
|
*/
|
|
static int afs_d_revalidate_rcu(struct dentry *dentry)
|
|
{
|
|
struct afs_vnode *dvnode, *vnode;
|
|
struct dentry *parent;
|
|
struct inode *dir, *inode;
|
|
long dir_version, de_version;
|
|
|
|
_enter("%p", dentry);
|
|
|
|
/* Check the parent directory is still valid first. */
|
|
parent = READ_ONCE(dentry->d_parent);
|
|
dir = d_inode_rcu(parent);
|
|
if (!dir)
|
|
return -ECHILD;
|
|
dvnode = AFS_FS_I(dir);
|
|
if (test_bit(AFS_VNODE_DELETED, &dvnode->flags))
|
|
return -ECHILD;
|
|
|
|
if (!afs_check_validity(dvnode))
|
|
return -ECHILD;
|
|
|
|
/* 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)READ_ONCE(dvnode->status.data_version);
|
|
de_version = (long)READ_ONCE(dentry->d_fsdata);
|
|
if (de_version != dir_version) {
|
|
dir_version = (long)READ_ONCE(dvnode->invalid_before);
|
|
if (de_version - dir_version < 0)
|
|
return -ECHILD;
|
|
}
|
|
|
|
/* Check to see if the vnode referred to by the dentry still
|
|
* has a callback.
|
|
*/
|
|
if (d_really_is_positive(dentry)) {
|
|
inode = d_inode_rcu(dentry);
|
|
if (inode) {
|
|
vnode = AFS_FS_I(inode);
|
|
if (!afs_check_validity(vnode))
|
|
return -ECHILD;
|
|
}
|
|
}
|
|
|
|
return 1; /* Still valid */
|
|
}
|
|
|
|
/*
|
|
* 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 fid;
|
|
struct dentry *parent;
|
|
struct inode *inode;
|
|
struct key *key;
|
|
afs_dataversion_t dir_version, invalid_before;
|
|
long de_version;
|
|
int ret;
|
|
|
|
if (flags & LOOKUP_RCU)
|
|
return afs_d_revalidate_rcu(dentry);
|
|
|
|
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 = dir->status.data_version;
|
|
de_version = (long)dentry->d_fsdata;
|
|
if (de_version == (long)dir_version)
|
|
goto out_valid_noupdate;
|
|
|
|
invalid_before = dir->invalid_before;
|
|
if (de_version - (long)invalid_before >= 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, &dir_version);
|
|
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 *)(unsigned long)dir_version;
|
|
out_valid_noupdate:
|
|
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);
|
|
}
|
|
|
|
void afs_check_for_remote_deletion(struct afs_operation *op)
|
|
{
|
|
struct afs_vnode *vnode = op->file[0].vnode;
|
|
|
|
switch (op->ac.abort_code) {
|
|
case VNOVNODE:
|
|
set_bit(AFS_VNODE_DELETED, &vnode->flags);
|
|
afs_break_callback(vnode, afs_cb_break_for_deleted);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Create a new inode for create/mkdir/symlink
|
|
*/
|
|
static void afs_vnode_new_inode(struct afs_operation *op)
|
|
{
|
|
struct afs_vnode_param *vp = &op->file[1];
|
|
struct afs_vnode *vnode;
|
|
struct inode *inode;
|
|
|
|
_enter("");
|
|
|
|
ASSERTCMP(op->error, ==, 0);
|
|
|
|
inode = afs_iget(op, vp);
|
|
if (IS_ERR(inode)) {
|
|
/* ENOMEM or EINTR at a really inconvenient time - just abandon
|
|
* the new directory on the server.
|
|
*/
|
|
op->error = PTR_ERR(inode);
|
|
return;
|
|
}
|
|
|
|
vnode = AFS_FS_I(inode);
|
|
set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
|
|
if (!op->error)
|
|
afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb);
|
|
d_instantiate(op->dentry, inode);
|
|
}
|
|
|
|
static void afs_create_success(struct afs_operation *op)
|
|
{
|
|
_enter("op=%08x", op->debug_id);
|
|
op->ctime = op->file[0].scb.status.mtime_client;
|
|
afs_vnode_commit_status(op, &op->file[0]);
|
|
afs_update_dentry_version(op, &op->file[0], op->dentry);
|
|
afs_vnode_new_inode(op);
|
|
}
|
|
|
|
static void afs_create_edit_dir(struct afs_operation *op)
|
|
{
|
|
struct afs_vnode_param *dvp = &op->file[0];
|
|
struct afs_vnode_param *vp = &op->file[1];
|
|
struct afs_vnode *dvnode = dvp->vnode;
|
|
|
|
_enter("op=%08x", op->debug_id);
|
|
|
|
down_write(&dvnode->validate_lock);
|
|
if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
|
|
dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
|
|
afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid,
|
|
op->create.reason);
|
|
up_write(&dvnode->validate_lock);
|
|
}
|
|
|
|
static void afs_create_put(struct afs_operation *op)
|
|
{
|
|
_enter("op=%08x", op->debug_id);
|
|
|
|
if (op->error)
|
|
d_drop(op->dentry);
|
|
}
|
|
|
|
static const struct afs_operation_ops afs_mkdir_operation = {
|
|
.issue_afs_rpc = afs_fs_make_dir,
|
|
.issue_yfs_rpc = yfs_fs_make_dir,
|
|
.success = afs_create_success,
|
|
.aborted = afs_check_for_remote_deletion,
|
|
.edit_dir = afs_create_edit_dir,
|
|
.put = afs_create_put,
|
|
};
|
|
|
|
/*
|
|
* create a directory on an AFS filesystem
|
|
*/
|
|
static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
|
|
struct dentry *dentry, umode_t mode)
|
|
{
|
|
struct afs_operation *op;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir);
|
|
|
|
_enter("{%llx:%llu},{%pd},%ho",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
|
|
|
|
op = afs_alloc_operation(NULL, dvnode->volume);
|
|
if (IS_ERR(op)) {
|
|
d_drop(dentry);
|
|
return PTR_ERR(op);
|
|
}
|
|
|
|
afs_op_set_vnode(op, 0, dvnode);
|
|
op->file[0].dv_delta = 1;
|
|
op->file[0].update_ctime = true;
|
|
op->dentry = dentry;
|
|
op->create.mode = S_IFDIR | mode;
|
|
op->create.reason = afs_edit_dir_for_mkdir;
|
|
op->ops = &afs_mkdir_operation;
|
|
return afs_do_sync_operation(op);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
}
|
|
|
|
static void afs_rmdir_success(struct afs_operation *op)
|
|
{
|
|
_enter("op=%08x", op->debug_id);
|
|
op->ctime = op->file[0].scb.status.mtime_client;
|
|
afs_vnode_commit_status(op, &op->file[0]);
|
|
afs_update_dentry_version(op, &op->file[0], op->dentry);
|
|
}
|
|
|
|
static void afs_rmdir_edit_dir(struct afs_operation *op)
|
|
{
|
|
struct afs_vnode_param *dvp = &op->file[0];
|
|
struct afs_vnode *dvnode = dvp->vnode;
|
|
|
|
_enter("op=%08x", op->debug_id);
|
|
afs_dir_remove_subdir(op->dentry);
|
|
|
|
down_write(&dvnode->validate_lock);
|
|
if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
|
|
dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
|
|
afs_edit_dir_remove(dvnode, &op->dentry->d_name,
|
|
afs_edit_dir_for_rmdir);
|
|
up_write(&dvnode->validate_lock);
|
|
}
|
|
|
|
static void afs_rmdir_put(struct afs_operation *op)
|
|
{
|
|
_enter("op=%08x", op->debug_id);
|
|
if (op->file[1].vnode)
|
|
up_write(&op->file[1].vnode->rmdir_lock);
|
|
}
|
|
|
|
static const struct afs_operation_ops afs_rmdir_operation = {
|
|
.issue_afs_rpc = afs_fs_remove_dir,
|
|
.issue_yfs_rpc = yfs_fs_remove_dir,
|
|
.success = afs_rmdir_success,
|
|
.aborted = afs_check_for_remote_deletion,
|
|
.edit_dir = afs_rmdir_edit_dir,
|
|
.put = afs_rmdir_put,
|
|
};
|
|
|
|
/*
|
|
* remove a directory from an AFS filesystem
|
|
*/
|
|
static int afs_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct afs_operation *op;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
|
|
int ret;
|
|
|
|
_enter("{%llx:%llu},{%pd}",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry);
|
|
|
|
op = afs_alloc_operation(NULL, dvnode->volume);
|
|
if (IS_ERR(op))
|
|
return PTR_ERR(op);
|
|
|
|
afs_op_set_vnode(op, 0, dvnode);
|
|
op->file[0].dv_delta = 1;
|
|
op->file[0].update_ctime = true;
|
|
|
|
op->dentry = dentry;
|
|
op->ops = &afs_rmdir_operation;
|
|
|
|
/* 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, op->key);
|
|
if (ret < 0)
|
|
goto error;
|
|
}
|
|
|
|
if (vnode) {
|
|
ret = down_write_killable(&vnode->rmdir_lock);
|
|
if (ret < 0)
|
|
goto error;
|
|
op->file[1].vnode = vnode;
|
|
}
|
|
|
|
return afs_do_sync_operation(op);
|
|
|
|
error:
|
|
return afs_put_operation(op);
|
|
}
|
|
|
|
/*
|
|
* 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 void afs_dir_remove_link(struct afs_operation *op)
|
|
{
|
|
struct afs_vnode *dvnode = op->file[0].vnode;
|
|
struct afs_vnode *vnode = op->file[1].vnode;
|
|
struct dentry *dentry = op->dentry;
|
|
int ret;
|
|
|
|
if (op->error != 0 ||
|
|
(op->file[1].scb.have_status && op->file[1].scb.have_error))
|
|
return;
|
|
if (d_really_is_positive(dentry))
|
|
return;
|
|
|
|
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, afs_cb_break_for_unlink);
|
|
}
|
|
write_sequnlock(&vnode->cb_lock);
|
|
} else {
|
|
afs_break_callback(vnode, afs_cb_break_for_unlink);
|
|
|
|
if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
|
|
_debug("AFS_VNODE_DELETED");
|
|
|
|
ret = afs_validate(vnode, op->key);
|
|
if (ret != -ESTALE)
|
|
op->error = ret;
|
|
}
|
|
|
|
_debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, op->error);
|
|
}
|
|
|
|
static void afs_unlink_success(struct afs_operation *op)
|
|
{
|
|
_enter("op=%08x", op->debug_id);
|
|
op->ctime = op->file[0].scb.status.mtime_client;
|
|
afs_check_dir_conflict(op, &op->file[0]);
|
|
afs_vnode_commit_status(op, &op->file[0]);
|
|
afs_vnode_commit_status(op, &op->file[1]);
|
|
afs_update_dentry_version(op, &op->file[0], op->dentry);
|
|
afs_dir_remove_link(op);
|
|
}
|
|
|
|
static void afs_unlink_edit_dir(struct afs_operation *op)
|
|
{
|
|
struct afs_vnode_param *dvp = &op->file[0];
|
|
struct afs_vnode *dvnode = dvp->vnode;
|
|
|
|
_enter("op=%08x", op->debug_id);
|
|
down_write(&dvnode->validate_lock);
|
|
if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
|
|
dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
|
|
afs_edit_dir_remove(dvnode, &op->dentry->d_name,
|
|
afs_edit_dir_for_unlink);
|
|
up_write(&dvnode->validate_lock);
|
|
}
|
|
|
|
static void afs_unlink_put(struct afs_operation *op)
|
|
{
|
|
_enter("op=%08x", op->debug_id);
|
|
if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT)
|
|
d_rehash(op->dentry);
|
|
}
|
|
|
|
static const struct afs_operation_ops afs_unlink_operation = {
|
|
.issue_afs_rpc = afs_fs_remove_file,
|
|
.issue_yfs_rpc = yfs_fs_remove_file,
|
|
.success = afs_unlink_success,
|
|
.aborted = afs_check_for_remote_deletion,
|
|
.edit_dir = afs_unlink_edit_dir,
|
|
.put = afs_unlink_put,
|
|
};
|
|
|
|
/*
|
|
* Remove a file or symlink from an AFS filesystem.
|
|
*/
|
|
static int afs_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct afs_operation *op;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir);
|
|
struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
|
|
int ret;
|
|
|
|
_enter("{%llx:%llu},{%pd}",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry);
|
|
|
|
if (dentry->d_name.len >= AFSNAMEMAX)
|
|
return -ENAMETOOLONG;
|
|
|
|
op = afs_alloc_operation(NULL, dvnode->volume);
|
|
if (IS_ERR(op))
|
|
return PTR_ERR(op);
|
|
|
|
afs_op_set_vnode(op, 0, dvnode);
|
|
op->file[0].dv_delta = 1;
|
|
op->file[0].update_ctime = true;
|
|
|
|
/* Try to make sure we have a callback promise on the victim. */
|
|
ret = afs_validate(vnode, op->key);
|
|
if (ret < 0) {
|
|
op->error = ret;
|
|
goto error;
|
|
}
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
if (d_count(dentry) > 1) {
|
|
spin_unlock(&dentry->d_lock);
|
|
/* Start asynchronous writeout of the inode */
|
|
write_inode_now(d_inode(dentry), 0);
|
|
op->error = afs_sillyrename(dvnode, vnode, dentry, op->key);
|
|
goto error;
|
|
}
|
|
if (!d_unhashed(dentry)) {
|
|
/* Prevent a race with RCU lookup. */
|
|
__d_drop(dentry);
|
|
op->unlink.need_rehash = true;
|
|
}
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
op->file[1].vnode = vnode;
|
|
op->file[1].update_ctime = true;
|
|
op->file[1].op_unlinked = true;
|
|
op->dentry = dentry;
|
|
op->ops = &afs_unlink_operation;
|
|
afs_begin_vnode_operation(op);
|
|
afs_wait_for_operation(op);
|
|
|
|
/* If there was a conflict with a third party, check the status of the
|
|
* unlinked vnode.
|
|
*/
|
|
if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) {
|
|
op->file[1].update_ctime = false;
|
|
op->fetch_status.which = 1;
|
|
op->ops = &afs_fetch_status_operation;
|
|
afs_begin_vnode_operation(op);
|
|
afs_wait_for_operation(op);
|
|
}
|
|
|
|
return afs_put_operation(op);
|
|
|
|
error:
|
|
return afs_put_operation(op);
|
|
}
|
|
|
|
static const struct afs_operation_ops afs_create_operation = {
|
|
.issue_afs_rpc = afs_fs_create_file,
|
|
.issue_yfs_rpc = yfs_fs_create_file,
|
|
.success = afs_create_success,
|
|
.aborted = afs_check_for_remote_deletion,
|
|
.edit_dir = afs_create_edit_dir,
|
|
.put = afs_create_put,
|
|
};
|
|
|
|
/*
|
|
* create a regular file on an AFS filesystem
|
|
*/
|
|
static int afs_create(struct user_namespace *mnt_userns, struct inode *dir,
|
|
struct dentry *dentry, umode_t mode, bool excl)
|
|
{
|
|
struct afs_operation *op;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir);
|
|
int ret = -ENAMETOOLONG;
|
|
|
|
_enter("{%llx:%llu},{%pd},%ho",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
|
|
|
|
if (dentry->d_name.len >= AFSNAMEMAX)
|
|
goto error;
|
|
|
|
op = afs_alloc_operation(NULL, dvnode->volume);
|
|
if (IS_ERR(op)) {
|
|
ret = PTR_ERR(op);
|
|
goto error;
|
|
}
|
|
|
|
afs_op_set_vnode(op, 0, dvnode);
|
|
op->file[0].dv_delta = 1;
|
|
op->file[0].update_ctime = true;
|
|
|
|
op->dentry = dentry;
|
|
op->create.mode = S_IFREG | mode;
|
|
op->create.reason = afs_edit_dir_for_create;
|
|
op->ops = &afs_create_operation;
|
|
return afs_do_sync_operation(op);
|
|
|
|
error:
|
|
d_drop(dentry);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
static void afs_link_success(struct afs_operation *op)
|
|
{
|
|
struct afs_vnode_param *dvp = &op->file[0];
|
|
struct afs_vnode_param *vp = &op->file[1];
|
|
|
|
_enter("op=%08x", op->debug_id);
|
|
op->ctime = dvp->scb.status.mtime_client;
|
|
afs_vnode_commit_status(op, dvp);
|
|
afs_vnode_commit_status(op, vp);
|
|
afs_update_dentry_version(op, dvp, op->dentry);
|
|
if (op->dentry_2->d_parent == op->dentry->d_parent)
|
|
afs_update_dentry_version(op, dvp, op->dentry_2);
|
|
ihold(&vp->vnode->vfs_inode);
|
|
d_instantiate(op->dentry, &vp->vnode->vfs_inode);
|
|
}
|
|
|
|
static void afs_link_put(struct afs_operation *op)
|
|
{
|
|
_enter("op=%08x", op->debug_id);
|
|
if (op->error)
|
|
d_drop(op->dentry);
|
|
}
|
|
|
|
static const struct afs_operation_ops afs_link_operation = {
|
|
.issue_afs_rpc = afs_fs_link,
|
|
.issue_yfs_rpc = yfs_fs_link,
|
|
.success = afs_link_success,
|
|
.aborted = afs_check_for_remote_deletion,
|
|
.edit_dir = afs_create_edit_dir,
|
|
.put = afs_link_put,
|
|
};
|
|
|
|
/*
|
|
* 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_operation *op;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir);
|
|
struct afs_vnode *vnode = AFS_FS_I(d_inode(from));
|
|
int ret = -ENAMETOOLONG;
|
|
|
|
_enter("{%llx:%llu},{%llx:%llu},{%pd}",
|
|
vnode->fid.vid, vnode->fid.vnode,
|
|
dvnode->fid.vid, dvnode->fid.vnode,
|
|
dentry);
|
|
|
|
if (dentry->d_name.len >= AFSNAMEMAX)
|
|
goto error;
|
|
|
|
op = afs_alloc_operation(NULL, dvnode->volume);
|
|
if (IS_ERR(op)) {
|
|
ret = PTR_ERR(op);
|
|
goto error;
|
|
}
|
|
|
|
afs_op_set_vnode(op, 0, dvnode);
|
|
afs_op_set_vnode(op, 1, vnode);
|
|
op->file[0].dv_delta = 1;
|
|
op->file[0].update_ctime = true;
|
|
op->file[1].update_ctime = true;
|
|
|
|
op->dentry = dentry;
|
|
op->dentry_2 = from;
|
|
op->ops = &afs_link_operation;
|
|
op->create.reason = afs_edit_dir_for_link;
|
|
return afs_do_sync_operation(op);
|
|
|
|
error:
|
|
d_drop(dentry);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
static const struct afs_operation_ops afs_symlink_operation = {
|
|
.issue_afs_rpc = afs_fs_symlink,
|
|
.issue_yfs_rpc = yfs_fs_symlink,
|
|
.success = afs_create_success,
|
|
.aborted = afs_check_for_remote_deletion,
|
|
.edit_dir = afs_create_edit_dir,
|
|
.put = afs_create_put,
|
|
};
|
|
|
|
/*
|
|
* create a symlink in an AFS filesystem
|
|
*/
|
|
static int afs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
|
|
struct dentry *dentry, const char *content)
|
|
{
|
|
struct afs_operation *op;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir);
|
|
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;
|
|
|
|
op = afs_alloc_operation(NULL, dvnode->volume);
|
|
if (IS_ERR(op)) {
|
|
ret = PTR_ERR(op);
|
|
goto error;
|
|
}
|
|
|
|
afs_op_set_vnode(op, 0, dvnode);
|
|
op->file[0].dv_delta = 1;
|
|
|
|
op->dentry = dentry;
|
|
op->ops = &afs_symlink_operation;
|
|
op->create.reason = afs_edit_dir_for_symlink;
|
|
op->create.symlink = content;
|
|
return afs_do_sync_operation(op);
|
|
|
|
error:
|
|
d_drop(dentry);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
static void afs_rename_success(struct afs_operation *op)
|
|
{
|
|
_enter("op=%08x", op->debug_id);
|
|
|
|
op->ctime = op->file[0].scb.status.mtime_client;
|
|
afs_check_dir_conflict(op, &op->file[1]);
|
|
afs_vnode_commit_status(op, &op->file[0]);
|
|
if (op->file[1].vnode != op->file[0].vnode) {
|
|
op->ctime = op->file[1].scb.status.mtime_client;
|
|
afs_vnode_commit_status(op, &op->file[1]);
|
|
}
|
|
}
|
|
|
|
static void afs_rename_edit_dir(struct afs_operation *op)
|
|
{
|
|
struct afs_vnode_param *orig_dvp = &op->file[0];
|
|
struct afs_vnode_param *new_dvp = &op->file[1];
|
|
struct afs_vnode *orig_dvnode = orig_dvp->vnode;
|
|
struct afs_vnode *new_dvnode = new_dvp->vnode;
|
|
struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry));
|
|
struct dentry *old_dentry = op->dentry;
|
|
struct dentry *new_dentry = op->dentry_2;
|
|
struct inode *new_inode;
|
|
|
|
_enter("op=%08x", op->debug_id);
|
|
|
|
if (op->rename.rehash) {
|
|
d_rehash(op->rename.rehash);
|
|
op->rename.rehash = NULL;
|
|
}
|
|
|
|
down_write(&orig_dvnode->validate_lock);
|
|
if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) &&
|
|
orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta)
|
|
afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
|
|
afs_edit_dir_for_rename_0);
|
|
|
|
if (new_dvnode != orig_dvnode) {
|
|
up_write(&orig_dvnode->validate_lock);
|
|
down_write(&new_dvnode->validate_lock);
|
|
}
|
|
|
|
if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) &&
|
|
new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) {
|
|
if (!op->rename.new_negative)
|
|
afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
|
|
afs_edit_dir_for_rename_1);
|
|
|
|
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);
|
|
}
|
|
|
|
/* Now we can update d_fsdata on the dentries to reflect their
|
|
* new parent's data_version.
|
|
*
|
|
* Note that if we ever implement RENAME_EXCHANGE, we'll have
|
|
* to update both dentries with opposing dir versions.
|
|
*/
|
|
afs_update_dentry_version(op, new_dvp, op->dentry);
|
|
afs_update_dentry_version(op, new_dvp, op->dentry_2);
|
|
|
|
d_move(old_dentry, new_dentry);
|
|
|
|
up_write(&new_dvnode->validate_lock);
|
|
}
|
|
|
|
static void afs_rename_put(struct afs_operation *op)
|
|
{
|
|
_enter("op=%08x", op->debug_id);
|
|
if (op->rename.rehash)
|
|
d_rehash(op->rename.rehash);
|
|
dput(op->rename.tmp);
|
|
if (op->error)
|
|
d_rehash(op->dentry);
|
|
}
|
|
|
|
static const struct afs_operation_ops afs_rename_operation = {
|
|
.issue_afs_rpc = afs_fs_rename,
|
|
.issue_yfs_rpc = yfs_fs_rename,
|
|
.success = afs_rename_success,
|
|
.edit_dir = afs_rename_edit_dir,
|
|
.put = afs_rename_put,
|
|
};
|
|
|
|
/*
|
|
* rename a file in an AFS filesystem and/or move it between directories
|
|
*/
|
|
static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
|
|
struct dentry *old_dentry, struct inode *new_dir,
|
|
struct dentry *new_dentry, unsigned int flags)
|
|
{
|
|
struct afs_operation *op;
|
|
struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
|
|
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);
|
|
|
|
op = afs_alloc_operation(NULL, orig_dvnode->volume);
|
|
if (IS_ERR(op))
|
|
return PTR_ERR(op);
|
|
|
|
afs_op_set_vnode(op, 0, orig_dvnode);
|
|
afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */
|
|
op->file[0].dv_delta = 1;
|
|
op->file[1].dv_delta = 1;
|
|
op->file[0].update_ctime = true;
|
|
op->file[1].update_ctime = true;
|
|
|
|
op->dentry = old_dentry;
|
|
op->dentry_2 = new_dentry;
|
|
op->rename.new_negative = d_is_negative(new_dentry);
|
|
op->ops = &afs_rename_operation;
|
|
|
|
/* 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);
|
|
op->rename.rehash = new_dentry;
|
|
}
|
|
|
|
if (d_count(new_dentry) > 2) {
|
|
/* copy the target dentry's name */
|
|
ret = -ENOMEM;
|
|
op->rename.tmp = d_alloc(new_dentry->d_parent,
|
|
&new_dentry->d_name);
|
|
if (!op->rename.tmp)
|
|
goto error;
|
|
|
|
ret = afs_sillyrename(new_dvnode,
|
|
AFS_FS_I(d_inode(new_dentry)),
|
|
new_dentry, op->key);
|
|
if (ret)
|
|
goto error;
|
|
|
|
op->dentry_2 = op->rename.tmp;
|
|
op->rename.rehash = NULL;
|
|
op->rename.new_negative = true;
|
|
}
|
|
}
|
|
|
|
/* This bit is potentially nasty as there's a potential race with
|
|
* afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry
|
|
* to reflect it's new parent's new data_version after the op, but
|
|
* d_revalidate may see old_dentry between the op having taken place
|
|
* and the version being updated.
|
|
*
|
|
* So drop the old_dentry for now to make other threads go through
|
|
* lookup instead - which we hold a lock against.
|
|
*/
|
|
d_drop(old_dentry);
|
|
|
|
return afs_do_sync_operation(op);
|
|
|
|
error:
|
|
return afs_put_operation(op);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
detach_page_private(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)
|
|
detach_page_private(page);
|
|
}
|