btrfs: add quota override flag to enable quota override for CAP_SYS_RESOURCE

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This patch introduces the quota override flag to btrfs_fs_info, and a
change to quota limit checking code to temporarily allow for quota to be
overridden for processes with CAP_SYS_RESOURCE.

It's useful for administrative programs, such as log rotation, that may
need to temporarily use more disk space in order to free up a greater
amount of overall disk space without yielding more disk space to the
rest of userland.

Eventually, we may want to add the idea of an operator-specific quota,
operator reserved space, or something else to allow for administrative
override, but this is perhaps the simplest solution.

Signed-off-by: Sargun Dhillon <sargun@sargun.me>
Reviewed-by: David Sterba <dsterba@suse.com>
[ minor changelog edits ]
Signed-off-by: David Sterba <dsterba@suse.com>

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Sargun Dhillon 2017-05-11 21:17:33 +00:00 • committed by David Sterba

parent a5ed45f822

commit f29efe2921

2 changed files with 7 additions and 0 deletions

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2

fs/btrfs/ctree.h

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5

fs/btrfs/qgroup.c

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