btrfs: Add quota_override knob into sysfs
This patch adds the read-write attribute quota_override into sysfs. Any process which has CAP_SYS_RESOURCE can set this flag to on, and once it is set to true, processes with CAP_SYS_RESOURCE can exceed the quota. 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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@ -447,11 +447,52 @@ static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,
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BTRFS_ATTR(clone_alignment, btrfs_clone_alignment_show);
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BTRFS_ATTR(clone_alignment, btrfs_clone_alignment_show);
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static ssize_t quota_override_show(struct kobject *kobj,
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struct kobj_attribute *a, char *buf)
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{
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struct btrfs_fs_info *fs_info = to_fs_info(kobj);
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int quota_override;
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quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
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return snprintf(buf, PAGE_SIZE, "%d\n", quota_override);
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}
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static ssize_t quota_override_store(struct kobject *kobj,
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struct kobj_attribute *a,
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const char *buf, size_t len)
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{
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struct btrfs_fs_info *fs_info = to_fs_info(kobj);
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unsigned long knob;
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int err;
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if (!fs_info)
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return -EPERM;
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if (!capable(CAP_SYS_RESOURCE))
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return -EPERM;
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err = kstrtoul(buf, 10, &knob);
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if (err)
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return err;
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if (knob > 1)
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return -EINVAL;
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if (knob)
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set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
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else
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clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
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return len;
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}
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BTRFS_ATTR_RW(quota_override, quota_override_show, quota_override_store);
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static const struct attribute *btrfs_attrs[] = {
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static const struct attribute *btrfs_attrs[] = {
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BTRFS_ATTR_PTR(label),
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BTRFS_ATTR_PTR(label),
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BTRFS_ATTR_PTR(nodesize),
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BTRFS_ATTR_PTR(nodesize),
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BTRFS_ATTR_PTR(sectorsize),
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BTRFS_ATTR_PTR(sectorsize),
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BTRFS_ATTR_PTR(clone_alignment),
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BTRFS_ATTR_PTR(clone_alignment),
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BTRFS_ATTR_PTR(quota_override),
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NULL,
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NULL,
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};
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};
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