linux/fs/notify
Amir Goldstein 30ad193832 fanotify: allow "weak" fsid when watching a single filesystem
So far, fanotify returns -ENODEV or -EXDEV when trying to set a mark
on a filesystem with a "weak" fsid, namely, zero fsid (e.g. fuse), or
non-uniform fsid (e.g. btrfs non-root subvol).

When group is watching inodes all from the same filesystem (or subvol),
allow adding inode marks with "weak" fsid, because there is no ambiguity
regarding which filesystem reports the event.

The first mark added to a group determines if this group is single or
multi filesystem, depending on the fsid at the path of the added mark.

If the first mark added has a "strong" fsid, marks with "weak" fsid
cannot be added and vice versa.

If the first mark added has a "weak" fsid, following marks must have
the same "weak" fsid and the same sb as the first mark.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <20231130165619.3386452-3-amir73il@gmail.com>
2023-12-01 10:55:21 +01:00
..
dnotify As usual, lots of singleton and doubleton patches all over the tree and 2023-11-02 20:53:31 -10:00
fanotify fanotify: allow "weak" fsid when watching a single filesystem 2023-12-01 10:55:21 +01:00
inotify treewide: mark stuff as __ro_after_init 2023-10-18 14:43:23 -07:00
fdinfo.c exportfs: add explicit flag to request non-decodeable file handles 2023-05-22 18:08:37 +02:00
fdinfo.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fsnotify.c fsnotify: Fix comment typo 2022-07-26 13:38:47 +02:00
fsnotify.h fsnotify: remove unused declaration 2022-09-09 11:40:03 +02:00
group.c fsnotify: create helpers for group mark_mutex lock 2022-04-25 14:37:22 +02:00
Kconfig fs/notify: Remove "select SRCU" 2023-02-02 16:26:06 -08:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mark.c fanotify: store fsid in mark instead of in connector 2023-12-01 10:55:21 +01:00
notification.c fsnotify: Pass group argument to free_event 2021-10-27 12:34:18 +02:00