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authorMark Fasheh <mfasheh@suse.de>2015-11-05 14:38:00 -0800
committerChris Mason <clm@fb.com>2015-11-25 05:27:33 -0800
commit82bd101b5240d3d1c4078a8017917a40c0dcc514 (patch)
tree0105605d854d46179bd8805b91994510f5b79365 /fs
parent2d9e97761087b46192c18181dfd1e7a930defcfd (diff)
downloadlinux-82bd101b5240d3d1c4078a8017917a40c0dcc514.tar.bz2
btrfs: qgroup: account shared subtree during snapshot delete
Commit 0ed4792 ('btrfs: qgroup: Switch to new extent-oriented qgroup mechanism.') removed our qgroup accounting during btrfs_drop_snapshot(). Predictably, this results in qgroup numbers going bad shortly after a snapshot is removed. Fix this by adding a dirty extent record when we encounter extents during our shared subtree walk. This effectively restores the functionality we had with the original shared subtree walking code in 1152651 (btrfs: qgroup: account shared subtrees during snapshot delete). The idea with the original patch (and this one) is that shared subtrees can get skipped during drop_snapshot. The shared subtree walk then allows us a chance to visit those extents and add them to the qgroup work for later processing. This ultimately makes the accounting for drop snapshot work. The new qgroup code nicely handles all the other extents during the tree walk via the ref dec/inc functions so we don't have to add actions beyond what we had originally. Signed-off-by: Mark Fasheh <mfasheh@suse.de> Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/extent-tree.c47
-rw-r--r--fs/btrfs/qgroup.c2
2 files changed, 42 insertions, 7 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index e563e5ab72b4..4b89680a1923 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -8108,21 +8108,47 @@ reada:
}
/*
- * TODO: Modify related function to add related node/leaf to dirty_extent_root,
- * for later qgroup accounting.
- *
- * Current, this function does nothing.
+ * These may not be seen by the usual inc/dec ref code so we have to
+ * add them here.
*/
+static int record_one_subtree_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr,
+ u64 num_bytes)
+{
+ struct btrfs_qgroup_extent_record *qrecord;
+ struct btrfs_delayed_ref_root *delayed_refs;
+
+ qrecord = kmalloc(sizeof(*qrecord), GFP_NOFS);
+ if (!qrecord)
+ return -ENOMEM;
+
+ qrecord->bytenr = bytenr;
+ qrecord->num_bytes = num_bytes;
+ qrecord->old_roots = NULL;
+
+ delayed_refs = &trans->transaction->delayed_refs;
+ spin_lock(&delayed_refs->lock);
+ if (btrfs_qgroup_insert_dirty_extent(delayed_refs, qrecord))
+ kfree(qrecord);
+ spin_unlock(&delayed_refs->lock);
+
+ return 0;
+}
+
static int account_leaf_items(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_buffer *eb)
{
int nr = btrfs_header_nritems(eb);
- int i, extent_type;
+ int i, extent_type, ret;
struct btrfs_key key;
struct btrfs_file_extent_item *fi;
u64 bytenr, num_bytes;
+ /* We can be called directly from walk_up_proc() */
+ if (!root->fs_info->quota_enabled)
+ return 0;
+
for (i = 0; i < nr; i++) {
btrfs_item_key_to_cpu(eb, &key, i);
@@ -8141,6 +8167,10 @@ static int account_leaf_items(struct btrfs_trans_handle *trans,
continue;
num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi);
+
+ ret = record_one_subtree_extent(trans, root, bytenr, num_bytes);
+ if (ret)
+ return ret;
}
return 0;
}
@@ -8209,8 +8239,6 @@ static int adjust_slots_upwards(struct btrfs_root *root,
/*
* root_eb is the subtree root and is locked before this function is called.
- * TODO: Modify this function to mark all (including complete shared node)
- * to dirty_extent_root to allow it get accounted in qgroup.
*/
static int account_shared_subtree(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
@@ -8288,6 +8316,11 @@ walk_down:
btrfs_tree_read_lock(eb);
btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);
path->locks[level] = BTRFS_READ_LOCK_BLOCKING;
+
+ ret = record_one_subtree_extent(trans, root, child_bytenr,
+ root->nodesize);
+ if (ret)
+ goto out;
}
if (level == 0) {
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index fd0a196c8f74..5279fdae7142 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -1462,6 +1462,8 @@ struct btrfs_qgroup_extent_record
struct btrfs_qgroup_extent_record *entry;
u64 bytenr = record->bytenr;
+ assert_spin_locked(&delayed_refs->lock);
+
while (*p) {
parent_node = *p;
entry = rb_entry(parent_node, struct btrfs_qgroup_extent_record,