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authorQu Wenruo <quwenruo@cn.fujitsu.com>2015-10-12 08:05:40 (GMT)
committerChris Mason <clm@fb.com>2015-10-22 01:37:45 (GMT)
commit524725537023bb25a371722b1329446e5a2adcdb (patch)
tree40e4d0798939f7a6c9f4ee27c7bf3225c3aa5bb0 /fs/btrfs/qgroup.c
parentfefdc55702a5f9f99778b6bdce4c4e1185ff943f (diff)
downloadlinux-524725537023bb25a371722b1329446e5a2adcdb.tar.xz
btrfs: qgroup: Introduce btrfs_qgroup_reserve_data function
Introduce a new function, btrfs_qgroup_reserve_data(), which will use io_tree to accurate qgroup reserve, to avoid reserved space leaking. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/qgroup.c')
-rw-r--r--fs/btrfs/qgroup.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index d904ee1..5066274 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -2486,3 +2486,52 @@ btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info)
btrfs_queue_work(fs_info->qgroup_rescan_workers,
&fs_info->qgroup_rescan_work);
}
+
+/*
+ * Reserve qgroup space for range [start, start + len).
+ *
+ * This function will either reserve space from related qgroups or doing
+ * nothing if the range is already reserved.
+ *
+ * Return 0 for successful reserve
+ * Return <0 for error (including -EQUOT)
+ *
+ * NOTE: this function may sleep for memory allocation.
+ */
+int btrfs_qgroup_reserve_data(struct inode *inode, u64 start, u64 len)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct extent_changeset changeset;
+ struct ulist_node *unode;
+ struct ulist_iterator uiter;
+ int ret;
+
+ if (!root->fs_info->quota_enabled || !is_fstree(root->objectid) ||
+ len == 0)
+ return 0;
+
+ changeset.bytes_changed = 0;
+ changeset.range_changed = ulist_alloc(GFP_NOFS);
+
+ ret = set_record_extent_bits(&BTRFS_I(inode)->io_tree, start,
+ start + len -1, EXTENT_QGROUP_RESERVED, GFP_NOFS,
+ &changeset);
+ if (ret < 0)
+ goto cleanup;
+ ret = btrfs_qgroup_reserve(root, changeset.bytes_changed);
+ if (ret < 0)
+ goto cleanup;
+
+ ulist_free(changeset.range_changed);
+ return ret;
+
+cleanup:
+ /* cleanup already reserved ranges */
+ ULIST_ITER_INIT(&uiter);
+ while ((unode = ulist_next(changeset.range_changed, &uiter)))
+ clear_extent_bit(&BTRFS_I(inode)->io_tree, unode->val,
+ unode->aux, EXTENT_QGROUP_RESERVED, 0, 0, NULL,
+ GFP_NOFS);
+ ulist_free(changeset.range_changed);
+ return ret;
+}