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authorSargun Dhillon <sargun@sargun.me>2017-05-11 21:17:33 +0000
committerDavid Sterba <dsterba@suse.com>2017-06-19 18:25:58 +0200
commitf29efe292198b9dbf67fb79ec9ffb5865ca29fb8 (patch)
treeeadca77167dd1b0c5f03c99b17d7aa00bd79aeff /fs/btrfs/qgroup.c
parenta5ed45f8224f2c7e4ad5a9673cb50e8e3128bd88 (diff)
downloadlinux-f29efe292198b9dbf67fb79ec9ffb5865ca29fb8.tar.bz2
btrfs: add quota override flag to enable quota override for CAP_SYS_RESOURCE
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>
Diffstat (limited to 'fs/btrfs/qgroup.c')
-rw-r--r--fs/btrfs/qgroup.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index deffbeb74a0b..458fec01d814 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -2338,6 +2338,11 @@ static int qgroup_reserve(struct btrfs_root *root, u64 num_bytes, bool enforce)
if (num_bytes == 0)
return 0;
+
+ if (test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags) &&
+ capable(CAP_SYS_RESOURCE))
+ enforce = false;
+
retry:
spin_lock(&fs_info->qgroup_lock);
quota_root = fs_info->quota_root;