diff options
| author | Christian Brauner <brauner@kernel.org> | 2024-08-30 15:04:46 +0200 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2024-09-09 11:58:07 +0200 |
| commit | d095a5be7533aa3e72f7358ddbcd595d67d56ff1 (patch) | |
| tree | bbc9b4fa34fbb38fe4506758480bbbe2708f5390 /fs/read_write.c | |
| parent | 1c5a54af4717ff54b640986768b901aa6c294297 (diff) | |
fs: add vfs_setpos_cookie()
Add a new helper and make vfs_setpos() call it. We will use it in
follow-up patches.
Link: https://lore.kernel.org/r/20240830-vfs-file-f_version-v1-5-6d3e4816aa7b@kernel.org
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/read_write.c')
| -rw-r--r-- | fs/read_write.c | 31 |
1 files changed, 25 insertions, 6 deletions
diff --git a/fs/read_write.c b/fs/read_write.c index 90e283b31ca1..66ff52860496 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -40,18 +40,20 @@ static inline bool unsigned_offsets(struct file *file) } /** - * vfs_setpos - update the file offset for lseek + * vfs_setpos_cookie - update the file offset for lseek and reset cookie * @file: file structure in question * @offset: file offset to seek to * @maxsize: maximum file size + * @cookie: cookie to reset * - * This is a low-level filesystem helper for updating the file offset to - * the value specified by @offset if the given offset is valid and it is - * not equal to the current file offset. + * Update the file offset to the value specified by @offset if the given + * offset is valid and it is not equal to the current file offset and + * reset the specified cookie to indicate that a seek happened. * * Return the specified offset on success and -EINVAL on invalid offset. */ -loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize) +static loff_t vfs_setpos_cookie(struct file *file, loff_t offset, + loff_t maxsize, u64 *cookie) { if (offset < 0 && !unsigned_offsets(file)) return -EINVAL; @@ -60,10 +62,27 @@ loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize) if (offset != file->f_pos) { file->f_pos = offset; - file->f_version = 0; + *cookie = 0; } return offset; } + +/** + * vfs_setpos - update the file offset for lseek + * @file: file structure in question + * @offset: file offset to seek to + * @maxsize: maximum file size + * + * This is a low-level filesystem helper for updating the file offset to + * the value specified by @offset if the given offset is valid and it is + * not equal to the current file offset. + * + * Return the specified offset on success and -EINVAL on invalid offset. + */ +loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize) +{ + return vfs_setpos_cookie(file, offset, maxsize, &file->f_version); +} EXPORT_SYMBOL(vfs_setpos); /** |