linux-ext4 - [PATCH 0/6] filesystem visibility ioctls

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Date: Mon,  5 Feb 2024 15:05:11 -0500
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-btrfs@...r.kernel.org,
	linux-xfs@...r.kernel.org,
	linux-ext4@...r.kernel.org
Cc: Kent Overstreet <kent.overstreet@...ux.dev>
Subject: [PATCH 0/6] filesystem visibility ioctls

Hi all,

this patchset adds a few new ioctls to standardize a few interfaces we
want
 - get/set UUID
 - get sysfs path

The get/set UUID ioctls are lifted versions of the ext4 ioctls with one
difference, killing the flexible array member - we'll never have UUIDs
more than 16 bytes, and getting rid of the flexible array member makes
them easier to use.

FS_IOC_GETSYSFSNAME is new, but it addresses something that we've been
doing in fs specific code for awhile - "given a path on a mounted
filesystem, tell me where it lives in sysfs".

Cheers,
Kent

Kent Overstreet (6):
  fs: super_block->s_uuid_len
  fs: FS_IOC_GETUUID
  fat: Hook up sb->s_uuid
  fs: FS_IOC_GETSYSFSNAME
  xfs: add support for FS_IOC_GETSYSFSNAME
  bcachefs: add support for FS_IOC_GETSYSFSNAME

 fs/bcachefs/fs.c        |  1 +
 fs/fat/inode.c          |  4 ++++
 fs/ioctl.c              | 33 +++++++++++++++++++++++++++++++++
 fs/super.c              |  1 +
 fs/xfs/xfs_mount.c      |  2 ++
 include/linux/fs.h      |  2 ++
 include/uapi/linux/fs.h | 21 +++++++++++++++++++++
 7 files changed, 64 insertions(+)

-- 
2.43.0