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| author | Kent Overstreet <kent.overstreet@linux.dev> | 2024-02-06 21:56:17 -0500 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2024-02-08 21:20:11 +0100 |
| commit | 41bcbe59c3b3fa7171dd2e3a365e6d5154198f30 (patch) | |
| tree | c179abc2f94423a98962ab1b3ed03d8058a15bb6 /Documentation/userspace-api | |
| parent | dd9019604cdaaff1327bfd36737230f912e2780d (diff) | |
| download | lwn-41bcbe59c3b3fa7171dd2e3a365e6d5154198f30.tar.gz lwn-41bcbe59c3b3fa7171dd2e3a365e6d5154198f30.zip | |
fs: FS_IOC_GETUUID
Add a new generic ioctls for querying the filesystem UUID.
These are lifted versions of the ext4 ioctls, with one change: we're not
using a flexible array member, because UUIDs will never be more than 16
bytes.
This patch adds a generic implementation of FS_IOC_GETFSUUID, which
reads from super_block->s_uuid. We're not lifting SETFSUUID from ext4 -
that can be done on offline filesystems by the people who need it,
trying to do it online is just asking for too much trouble.
Cc: Christian Brauner <brauner@kernel.org>
Cc: Jan Kara <jack@suse.cz>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: Darrick J. Wong <djwong@kernel.org>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Link: https://lore.kernel.org/r/20240207025624.1019754-4-kent.overstreet@linux.dev
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'Documentation/userspace-api')
| -rw-r--r-- | Documentation/userspace-api/ioctl/ioctl-number.rst | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst index 457e16f06e04..3731ecf1e437 100644 --- a/Documentation/userspace-api/ioctl/ioctl-number.rst +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst @@ -82,8 +82,9 @@ Code Seq# Include File Comments 0x10 00-0F drivers/char/s390/vmcp.h 0x10 10-1F arch/s390/include/uapi/sclp_ctl.h 0x10 20-2F arch/s390/include/uapi/asm/hypfs.h -0x12 all linux/fs.h +0x12 all linux/fs.h BLK* ioctls linux/blkpg.h +0x15 all linux/fs.h FS_IOC_* ioctls 0x1b all InfiniBand Subsystem <http://infiniband.sourceforge.net/> 0x20 all drivers/cdrom/cm206.h |