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udf: 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-v1-15-6d3e4816aa7b@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 15:04:56 +02:00
parent b4dba2efa8
commit 3dd4624ffc
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/udf/dir.c
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@ -60,7 +60,7 @@ static int udf_readdir(struct file *file, struct dir_context *ctx)
* identifying beginning of dir entry (names are under user control),
* we need to scan the directory from the beginning.
*/
if (!inode_eq_iversion(dir, file->f_version)) {
if (!inode_eq_iversion(dir, *(u64 *)file->private_data)) {
emit_pos = nf_pos;
nf_pos = 0;
} else {
@ -122,15 +122,37 @@ out_iter:
udf_fiiter_release(&iter);
out:
if (pos_valid)
file->f_version = inode_query_iversion(dir);
*(u64 *)file->private_data = inode_query_iversion(dir);
kfree(fname);
return ret;
}
static int udf_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 udf_dir_release(struct inode *inode, struct file *file)
{
kfree(file->private_data);
return 0;
}
static loff_t udf_dir_llseek(struct file *file, loff_t offset, int whence)
{
return generic_llseek_cookie(file, offset, whence,
(u64 *)file->private_data);
}
/* readdir and lookup functions */
const struct file_operations udf_dir_operations = {
.llseek = generic_file_llseek,
.open = udf_dir_open,
.release = udf_dir_release,
.llseek = udf_dir_llseek,
.read = generic_read_dir,
.iterate_shared = udf_readdir,
.unlocked_ioctl = udf_ioctl,