Btrfs: fix lockdep warning on deadlock against an inode's log mutex

[cascardo/linux.git] / fs / btrfs / tree-log.c

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index fff3f3e..e935035 100644 (file)
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -27,6 +27,7 @@
 #include "backref.h"
 #include "hash.h"
 #include "compression.h"
+#include "qgroup.h"
 
 /* magic values for the inode_only field in btrfs_log_inode:
  *
@@ -680,6 +681,21 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans,
                ins.type = BTRFS_EXTENT_ITEM_KEY;
                offset = key->offset - btrfs_file_extent_offset(eb, item);
 
+               /*
+                * Manually record dirty extent, as here we did a shallow
+                * file extent item copy and skip normal backref update,
+                * but modifying extent tree all by ourselves.
+                * So need to manually record dirty extent for qgroup,
+                * as the owner of the file extent changed from log tree
+                * (doesn't affect qgroup) to fs/file tree(affects qgroup)
+                */
+               ret = btrfs_qgroup_insert_dirty_extent(trans, root->fs_info,
+                               btrfs_file_extent_disk_bytenr(eb, item),
+                               btrfs_file_extent_disk_num_bytes(eb, item),
+                               GFP_NOFS);
+               if (ret < 0)
+                       goto out;
+
                if (ins.objectid > 0) {
                        u64 csum_start;
                        u64 csum_end;
@@ -2807,7 +2823,7 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
         */
        mutex_unlock(&root->log_mutex);
 
-       btrfs_init_log_ctx(&root_log_ctx);
+       btrfs_init_log_ctx(&root_log_ctx, NULL);
 
        mutex_lock(&log_root_tree->log_mutex);
        atomic_inc(&log_root_tree->log_batch);
@@ -4741,7 +4757,8 @@ again:
                        if (ret < 0) {
                                err = ret;
                                goto out_unlock;
-                       } else if (ret > 0) {
+                       } else if (ret > 0 && ctx &&
+                                  other_ino != btrfs_ino(ctx->inode)) {
                                struct btrfs_key inode_key;
                                struct inode *other_inode;