Hi all,
After recent discussions about how to allow sysadmins to opt in or out
of automatick fsck for XFS[1][2], I now have a patchset for xfsprogs
6.10 that implements the filesystem properties that we talked about.
As a refresher, the design I settled on is to add ATTR_ROOT (aka
"trusted") xattrs to the root directory. ATTR_ROOT xattrs can only be
accessed by processes with CAP_SYS_ADMIN, so unprivileged userspace
can't mess with the sysadmin's configured preferences.
I decided that all fs properties should have "xfs:" in the name to make
them look distinct, and defined "trusted.xfs:autofsck" as the property
that controls the behavior of automatic fsck. There's a new wrapper
program "xfs_property" that one can use to administer the properties.
xfs_scrub{,bed} uses the property; and mkfs.xfs can set it for you at
format time.
# mkfs.xfs -m autofsck /dev/sda
# xfs_property /dev/sda get autofsck
repair
# mount /dev/sda /mnt
# xfs_property /mnt set autofsck=check
# xfs_scrub -o autofsck /mnt
Info: /mnt: Checking per autofsck directive.
--D
[1] https://lore.kernel.org/linux-xfs/20240724213852.GA612460@frogsfrogsfrogs/
[2] https://lore.kernel.org/linux-xfs/20240730031030.GA6333@frogsfrogsfrogs/
