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fs: remove f_version

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Now that detecting concurrent seeks is done by the filesystems that
require it we can remove f_version and free up 8 bytes for future
extensions.

Link: https://lore.kernel.org/r/20240830-vfs-file-f_version-v1-20-6d3e4816aa7b@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 15:05:01 +02:00
parent 5a957bbac3
commit 11068e0b64
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
2 changed files with 5 additions and 8 deletions
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9
fs/read_write.c
View File

@ -62,7 +62,8 @@ static loff_t vfs_setpos_cookie(struct file *file, loff_t offset,
if (offset != file->f_pos) {
file->f_pos = offset;
*cookie = 0;
if (cookie)
*cookie = 0;
}
return offset;
}
@ -81,7 +82,7 @@ static loff_t vfs_setpos_cookie(struct file *file, loff_t offset,
*/
loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize)
{
return vfs_setpos_cookie(file, offset, maxsize, &file->f_version);
return vfs_setpos_cookie(file, offset, maxsize, NULL);
}
EXPORT_SYMBOL(vfs_setpos);
@ -364,10 +365,8 @@ loff_t default_llseek(struct file *file, loff_t offset, int whence)
}
retval = -EINVAL;
if (offset >= 0 || unsigned_offsets(file)) {
if (offset != file->f_pos) {
if (offset != file->f_pos)
file->f_pos = offset;
file->f_version = 0;
}
retval = offset;
}
out:

4
include/linux/fs.h
View File

@ -1003,7 +1003,6 @@ static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
* @f_pos_lock: lock protecting file position
* @f_pipe: specific to pipes
* @f_pos: file position
* @f_version: file version
* @f_security: LSM security context of this file
* @f_owner: file owner
* @f_wb_err: writeback error
@ -1034,11 +1033,10 @@ struct file {
u64 f_pipe;
};
loff_t f_pos;
u64 f_version;
/* --- cacheline 2 boundary (128 bytes) --- */
#ifdef CONFIG_SECURITY
void *f_security;
#endif
/* --- cacheline 2 boundary (128 bytes) --- */
struct fown_struct *f_owner;
errseq_t f_wb_err;
errseq_t f_sb_err;