diff options
| -rw-r--r-- | fs/btrfs/extent-tree.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index afc3ac5e57d..d133edfcd44 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -4535,16 +4535,25 @@ int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) int extra_reserve = 0; enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL; int ret; + bool delalloc_lock = true; - /* Need to be holding the i_mutex here if we aren't free space cache */ - if (btrfs_is_free_space_inode(inode)) + /* If we are a free space inode we need to not flush since we will be in + * the middle of a transaction commit. We also don't need the delalloc + * mutex since we won't race with anybody. We need this mostly to make + * lockdep shut its filthy mouth. + */ + if (btrfs_is_free_space_inode(inode)) { flush = BTRFS_RESERVE_NO_FLUSH; + delalloc_lock = false; + } if (flush != BTRFS_RESERVE_NO_FLUSH && btrfs_transaction_in_commit(root->fs_info)) schedule_timeout(1); - mutex_lock(&BTRFS_I(inode)->delalloc_mutex); + if (delalloc_lock) + mutex_lock(&BTRFS_I(inode)->delalloc_mutex); + num_bytes = ALIGN(num_bytes, root->sectorsize); spin_lock(&BTRFS_I(inode)->lock); @@ -4577,7 +4586,8 @@ int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) spin_lock(&BTRFS_I(inode)->lock); calc_csum_metadata_size(inode, num_bytes, 0); spin_unlock(&BTRFS_I(inode)->lock); - mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); + if (delalloc_lock) + mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); return ret; } } @@ -4616,7 +4626,8 @@ int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) btrfs_qgroup_free(root, num_bytes + nr_extents * root->leafsize); } - mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); + if (delalloc_lock) + mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); return ret; } @@ -4628,7 +4639,9 @@ int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes) } BTRFS_I(inode)->reserved_extents += nr_extents; spin_unlock(&BTRFS_I(inode)->lock); - mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); + + if (delalloc_lock) + mutex_unlock(&BTRFS_I(inode)->delalloc_mutex); if (to_reserve) trace_btrfs_space_reservation(root->fs_info,"delalloc", |