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fanotify: merge two checks regarding add of ignore mark

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There are two similar checks for adding an ignore mark without
FAN_MARK_IGNORED_SURV_MODIFY, one for the old FAN_MARK_IGNORED flag
and one for the new FAN_MARK_IGNORE flag.

Merge the two checks into a single location.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <20240317184154.1200192-5-amir73il@gmail.com>
This commit is contained in:
Amir Goldstein 2024-03-17 20:41:48 +02:00 committed by Jan Kara
parent 230d97d39e
commit b5cae086cc
1 changed files with 17 additions and 18 deletions
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35
fs/notify/fanotify/fanotify_user.c
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@ -1412,18 +1412,6 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group,
struct inode *inode, __u32 mask,
unsigned int flags, struct fan_fsid *fsid)
{
pr_debug("%s: group=%p inode=%p\n", __func__, group, inode);
/*
* If some other task has this inode open for write we should not add
* an ignore mask, unless that ignore mask is supposed to survive
* modification changes anyway.
*/
if ((flags & FANOTIFY_MARK_IGNORE_BITS) &&
!(flags & FAN_MARK_IGNORED_SURV_MODIFY) &&
inode_is_open_for_write(inode))
return 0;
return fanotify_add_mark(group, &inode->i_fsnotify_marks,
FSNOTIFY_OBJ_TYPE_INODE, mask, flags, fsid);
}
@ -1913,12 +1901,23 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
else
mnt = path.mnt;
ret = mnt ? -EINVAL : -EISDIR;
/* FAN_MARK_IGNORE requires SURV_MODIFY for sb/mount/dir marks */
if (mark_cmd == FAN_MARK_ADD && ignore == FAN_MARK_IGNORE &&
(mnt || S_ISDIR(inode->i_mode)) &&
!(flags & FAN_MARK_IGNORED_SURV_MODIFY))
goto path_put_and_out;
/*
* If some other task has this inode open for write we should not add
* an ignore mask, unless that ignore mask is supposed to survive
* modification changes anyway.
*/
if (mark_cmd == FAN_MARK_ADD && (flags & FANOTIFY_MARK_IGNORE_BITS) &&
!(flags & FAN_MARK_IGNORED_SURV_MODIFY)) {
ret = mnt ? -EINVAL : -EISDIR;
/* FAN_MARK_IGNORE requires SURV_MODIFY for sb/mount/dir marks */
if (ignore == FAN_MARK_IGNORE &&
(mnt || S_ISDIR(inode->i_mode)))
goto path_put_and_out;
ret = 0;
if (inode && inode_is_open_for_write(inode))
goto path_put_and_out;
}
/* Mask out FAN_EVENT_ON_CHILD flag for sb/mount/non-dir marks */
if (mnt || !S_ISDIR(inode->i_mode)) {