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ufs: 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-v1-16-6d3e4816aa7b@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 15:04:57 +02:00
parent 3dd4624ffc
commit 0bea8287df
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/ufs/dir.c
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@ -435,7 +435,7 @@ ufs_readdir(struct file *file, struct dir_context *ctx)
unsigned long n = pos >> PAGE_SHIFT;
unsigned long npages = dir_pages(inode);
unsigned chunk_mask = ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
bool need_revalidate = !inode_eq_iversion(inode, file->f_version);
bool need_revalidate = !inode_eq_iversion(inode, *(u64 *)file->private_data);
unsigned flags = UFS_SB(sb)->s_flags;
UFSD("BEGIN\n");
@ -462,7 +462,7 @@ ufs_readdir(struct file *file, struct dir_context *ctx)
offset = ufs_validate_entry(sb, 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 = (struct ufs_dir_entry *)(kaddr+offset);
@ -646,9 +646,31 @@ not_empty:
return 0;
}
static int ufs_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 ufs_dir_release(struct inode *inode, struct file *file)
{
kfree(file->private_data);
return 0;
}
static loff_t ufs_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 ufs_dir_operations = {
.open = ufs_dir_open,
.release = ufs_dir_release,
.read = generic_read_dir,
.iterate_shared = ufs_readdir,
.fsync = generic_file_fsync,
.llseek = generic_file_llseek,
.llseek = ufs_dir_llseek,
};