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ext2: store cookie in private data

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Store the cookie to detect concurrent seeks on directories in
file->private_data.

Link: https://lore.kernel.org/r/20240830-vfs-file-f_version-v1-10-6d3e4816aa7b@kernel.org
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2024-08-30 15:04:51 +02:00
parent bad74142a0
commit 794576e075
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
1 changed files with 25 additions and 3 deletions
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28
fs/ext2/dir.c
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@ -263,7 +263,7 @@ ext2_readdir(struct file *file, struct dir_context *ctx)
unsigned long n = pos >> PAGE_SHIFT;
unsigned long npages = dir_pages(inode);
unsigned chunk_mask = ~(ext2_chunk_size(inode)-1);
bool need_revalidate = !inode_eq_iversion(inode, file->f_version);
bool need_revalidate = !inode_eq_iversion(inode, *(u64 *)file->private_data);
bool has_filetype;
if (pos > inode->i_size - EXT2_DIR_REC_LEN(1))
@ -290,7 +290,7 @@ ext2_readdir(struct file *file, struct dir_context *ctx)
offset = ext2_validate_entry(kaddr, offset, chunk_mask);
ctx->pos = (n<<PAGE_SHIFT) + offset;
}
file->f_version = inode_query_iversion(inode);
*(u64 *)file->private_data = inode_query_iversion(inode);
need_revalidate = false;
}
de = (ext2_dirent *)(kaddr+offset);
@ -703,8 +703,30 @@ not_empty:
return 0;
}
static int ext2_dir_open(struct inode *inode, struct file *file)
{
file->private_data = kzalloc(sizeof(u64), GFP_KERNEL);
if (!file->private_data)
return -ENOMEM;
return 0;
}
static int ext2_dir_release(struct inode *inode, struct file *file)
{
kfree(file->private_data);
return 0;
}
static loff_t ext2_dir_llseek(struct file *file, loff_t offset, int whence)
{
return generic_llseek_cookie(file, offset, whence,
(u64 *)file->private_data);
}
const struct file_operations ext2_dir_operations = {
.llseek = generic_file_llseek,
.open = ext2_dir_open,
.release = ext2_dir_release,
.llseek = ext2_dir_llseek,
.read = generic_read_dir,
.iterate_shared = ext2_readdir,
.unlocked_ioctl = ext2_ioctl,