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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>
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2 changed files with 7 additions and 0 deletions
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@ -716,6 +716,8 @@ struct btrfs_delayed_root;
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#define BTRFS_FS_BTREE_ERR 11
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#define BTRFS_FS_LOG1_ERR 12
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#define BTRFS_FS_LOG2_ERR 13
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#define BTRFS_FS_QUOTA_OVERRIDE 14
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/*
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* Indicate that a whole-filesystem exclusive operation is running
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* (device replace, resize, device add/delete, balance)
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@ -2338,6 +2338,11 @@ static int qgroup_reserve(struct btrfs_root *root, u64 num_bytes, bool enforce)
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if (num_bytes == 0)
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return 0;
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if (test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags) &&
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capable(CAP_SYS_RESOURCE))
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enforce = false;
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retry:
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spin_lock(&fs_info->qgroup_lock);
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quota_root = fs_info->quota_root;
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