Pull misc vfs updates from Al Viro:
 "Assorted stuff all over the place"

* 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  useful constants: struct qstr for ".."
  hostfs_open(): don't open-code file_dentry()
  whack-a-mole: kill strlen_user() (again)
  autofs: should_expire() argument is guaranteed to be positive
  apparmor:match_mn() - constify devpath argument
  buffer: a small optimization in grow_buffers
  get rid of autofs_getpath()
  constify dentry argument of dentry_path()/dentry_path_raw()

Pull fsnotify updates from Jan Kara:

 - support for limited fanotify functionality for unpriviledged users

 - faster merging of fanotify events

 - a few smaller fsnotify improvements

* tag 'fsnotify_for_v5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  shmem: allow reporting fanotify events with file handles on tmpfs
  fs: introduce a wrapper uuid_to_fsid()
  fanotify_user: use upper_32_bits() to verify mask
  fanotify: support limited functionality for unprivileged users
  fanotify: configurable limits via sysfs
  fanotify: limit number of event merge attempts
  fsnotify: use hash table for faster events merge
  fanotify: mix event info and pid into merge key hash
  fanotify: reduce event objectid to 29-bit hash
  fsnotify: allow fsnotify_{peek,remove}_first_event with empty queue

Pull quota, ext2, reiserfs updates from Jan Kara:

 - support for path (instead of device) based quotactl syscall
   (quotactl_path(2))

 - ext2 conversion to kmap_local()

 - other minor cleanups & fixes

* tag 'for_v5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  fs/reiserfs/journal.c: delete useless variables
  fs/ext2: Replace kmap() with kmap_local_page()
  ext2: Match up ext2_put_page() with ext2_dotdot() and ext2_find_entry()
  fs/ext2/: fix misspellings using codespell tool
  quota: report warning limits for realtime space quotas
  quota: wire up quotactl_path
  quota: Add mountpath based quota support

Some filesystem's use a digest of their uuid for f_fsid.
Create a simple wrapper for this open coded folding.

Filesystems that have a non null uuid but use the block device
number for f_fsid may also consider using this helper.

[JK: Added missing asm/byteorder.h include]
Link: https://lore.kernel.org/r/20210322173944.449469-2-amir73il@gmail.com
Acked-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Use the fileattr API to let the VFS handle locking, permission checking and
conversion.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Cc: Jan Kara <jack@suse.cz>

The k[un]map() calls in ext2_[get|put]_page() are localized to a single
thread.  kmap_local_page() is more efficient.

Replace the kmap/kunmap calls with kmap_local_page()/kunmap_local().
kunmap_local() requires the mapping address so return that address from
ext2_get_page() to be used in ext2_put_page().  This works well because
many of the callers need the address anyway so it is not bad to return
it along with the page.

In addition, kmap_local_page()/kunmap_local() require strict nesting
rules to be followed.

Document the new nesting requirements of ext2_get_page() and
ext2_put_page() as well as the relationship between ext2_get_page(),
ext2_find_entry(), and ext2_dotdot().

Adjust one ext2_put_page() call site in ext2_rename() to ensure the new
nesting requirements are met.

Finally, adjust code style for checkpatch.

To: Jan Kara <jack@suse.com>
Link: https://lore.kernel.org/r/20210329065402.3297092-3-ira.weiny@intel.com
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>

ext2_dotdot() and ext2_find_entry() both require ext2_put_page() to be
called after successful return.  For some of the calls this
corresponding put was hidden in ext2_set_link and ext2_delete_entry().

Match up ext2_put_page() with ext2_dotdot() and ext2_find_entry() in the
functions which call them.  This makes the code easier to follow
regarding the get/put of the page.

Clean up comments to match new behavior.

To: Jan Kara <jack@suse.com>
Link: https://lore.kernel.org/r/20210329065402.3297092-2-ira.weiny@intel.com
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>

A typo is found out by codespell tool in 1107th lines of super.c:

$ codespell ./fs/ext2/
./super.c:1107: fileystem  ==> filesystem

Fix a typo found by codespell.

Link: https://lore.kernel.org/r/20210319003131.484738-1-liu.xuzhi@zte.com.cn
Signed-off-by: Liu xuzhi <liu.xuzhi@zte.com.cn>
Signed-off-by: Jan Kara <jack@suse.cz>

Extend some inode methods with an additional user namespace argument. A
filesystem that is aware of idmapped mounts will receive the user
namespace the mount has been marked with. This can be used for
additional permission checking and also to enable filesystems to
translate between uids and gids if they need to. We have implemented all
relevant helpers in earlier patches.

As requested we simply extend the exisiting inode method instead of
introducing new ones. This is a little more code churn but it's mostly
mechanical and doesnt't leave us with additional inode methods.

Link: https://lore.kernel.org/r/20210121131959.646623-25-christian.brauner@ubuntu.com
Cc: Christoph Hellwig <hch@lst.de>
Cc: David Howells <dhowells@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>