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fanotify: merge two checks regarding add of ignore mark
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>
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@ -1412,18 +1412,6 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group,
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struct inode *inode, __u32 mask,
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unsigned int flags, struct fan_fsid *fsid)
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{
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pr_debug("%s: group=%p inode=%p\n", __func__, group, inode);
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/*
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* If some other task has this inode open for write we should not add
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* an ignore mask, unless that ignore mask is supposed to survive
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* modification changes anyway.
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*/
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if ((flags & FANOTIFY_MARK_IGNORE_BITS) &&
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!(flags & FAN_MARK_IGNORED_SURV_MODIFY) &&
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inode_is_open_for_write(inode))
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return 0;
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return fanotify_add_mark(group, &inode->i_fsnotify_marks,
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FSNOTIFY_OBJ_TYPE_INODE, mask, flags, fsid);
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}
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@ -1913,13 +1901,24 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
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else
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mnt = path.mnt;
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/*
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* If some other task has this inode open for write we should not add
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* an ignore mask, unless that ignore mask is supposed to survive
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* modification changes anyway.
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*/
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if (mark_cmd == FAN_MARK_ADD && (flags & FANOTIFY_MARK_IGNORE_BITS) &&
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!(flags & FAN_MARK_IGNORED_SURV_MODIFY)) {
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ret = mnt ? -EINVAL : -EISDIR;
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/* FAN_MARK_IGNORE requires SURV_MODIFY for sb/mount/dir marks */
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if (mark_cmd == FAN_MARK_ADD && ignore == FAN_MARK_IGNORE &&
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(mnt || S_ISDIR(inode->i_mode)) &&
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!(flags & FAN_MARK_IGNORED_SURV_MODIFY))
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if (ignore == FAN_MARK_IGNORE &&
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(mnt || S_ISDIR(inode->i_mode)))
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goto path_put_and_out;
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ret = 0;
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if (inode && inode_is_open_for_write(inode))
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goto path_put_and_out;
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}
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/* Mask out FAN_EVENT_ON_CHILD flag for sb/mount/non-dir marks */
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if (mnt || !S_ISDIR(inode->i_mode)) {
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mask &= ~FAN_EVENT_ON_CHILD;
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