[PATCH 41/45] btrfs: free more things in btrfs_free_fs_info

[Josef Bacik <josef@toxicpanda.com>]

Things like the percpu_counters, the mapping_tree, and the csum hash can
all be free'd at btrfs_free_fs_info time, since the helpers all check if
the structure has been init'ed already.  This significantly cleans up
the error cases in open_ctree.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
 fs/btrfs/disk-io.c | 60 +++++++++++++++++++---------------------------
 1 file changed, 24 insertions(+), 36 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 64e9df8e64fd..b13f3f6e326d 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -97,6 +97,12 @@ void __cold btrfs_end_io_wq_exit(void)
 	kmem_cache_destroy(btrfs_end_io_wq_cache);
 }
 
+static void btrfs_free_csum_hash(struct btrfs_fs_info *fs_info)
+{
+	if (fs_info->csum_shash)
+		crypto_free_shash(fs_info->csum_shash);
+}
+
 /*
  * async submit bios are used to offload expensive checksumming
  * onto the worker threads.  They checksum file and metadata bios
@@ -1529,6 +1535,13 @@ int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
 
 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
 {
+	percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
+	percpu_counter_destroy(&fs_info->delalloc_bytes);
+	percpu_counter_destroy(&fs_info->dio_bytes);
+	percpu_counter_destroy(&fs_info->dev_replace.bio_counter);
+	btrfs_free_csum_hash(fs_info);
+	btrfs_free_stripe_hash_table(fs_info);
+	btrfs_free_ref_cache(fs_info);
 	kfree(fs_info->balance_ctl);
 	kfree(fs_info->delayed_root);
 	btrfs_put_fs_root(fs_info->extent_root);
@@ -2204,11 +2217,6 @@ static int btrfs_init_csum_hash(struct btrfs_fs_info *fs_info, u16 csum_type)
 	return 0;
 }
 
-static void btrfs_free_csum_hash(struct btrfs_fs_info *fs_info)
-{
-	crypto_free_shash(fs_info->csum_shash);
-}
-
 static int btrfs_replay_log(struct btrfs_fs_info *fs_info,
 			    struct btrfs_fs_devices *fs_devices)
 {
@@ -2683,7 +2691,7 @@ int __cold open_ctree(struct super_block *sb,
 	ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL);
 	if (ret) {
 		err = ret;
-		goto fail_dio_bytes;
+		goto fail_srcu;
 	}
 	fs_info->dirty_metadata_batch = PAGE_SIZE *
 					(1 + ilog2(nr_cpu_ids));
@@ -2691,14 +2699,14 @@ int __cold open_ctree(struct super_block *sb,
 	ret = percpu_counter_init(&fs_info->delalloc_bytes, 0, GFP_KERNEL);
 	if (ret) {
 		err = ret;
-		goto fail_dirty_metadata_bytes;
+		goto fail_srcu;
 	}
 
 	ret = percpu_counter_init(&fs_info->dev_replace.bio_counter, 0,
 			GFP_KERNEL);
 	if (ret) {
 		err = ret;
-		goto fail_delalloc_bytes;
+		goto fail_srcu;
 	}
 
 	INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
@@ -2766,7 +2774,7 @@ int __cold open_ctree(struct super_block *sb,
 	fs_info->btree_inode = new_inode(sb);
 	if (!fs_info->btree_inode) {
 		err = -ENOMEM;
-		goto fail_bio_counter;
+		goto fail_srcu;
 	}
 	mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
 
@@ -2878,7 +2886,7 @@ int __cold open_ctree(struct super_block *sb,
 		btrfs_err(fs_info, "superblock checksum mismatch");
 		err = -EINVAL;
 		brelse(bh);
-		goto fail_csum;
+		goto fail_alloc;
 	}
 
 	/*
@@ -2915,11 +2923,11 @@ int __cold open_ctree(struct super_block *sb,
 	if (ret) {
 		btrfs_err(fs_info, "superblock contains fatal errors");
 		err = -EINVAL;
-		goto fail_csum;
+		goto fail_alloc;
 	}
 
 	if (!btrfs_super_root(disk_super))
-		goto fail_csum;
+		goto fail_alloc;
 
 	/* check FS state, whether FS is broken. */
 	if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR)
@@ -2934,7 +2942,7 @@ int __cold open_ctree(struct super_block *sb,
 	ret = btrfs_parse_options(fs_info, options, sb->s_flags);
 	if (ret) {
 		err = ret;
-		goto fail_csum;
+		goto fail_alloc;
 	}
 
 	features = btrfs_super_incompat_flags(disk_super) &
@@ -2944,7 +2952,7 @@ int __cold open_ctree(struct super_block *sb,
 		    "cannot mount because of unsupported optional features (%llx)",
 		    features);
 		err = -EINVAL;
-		goto fail_csum;
+		goto fail_alloc;
 	}
 
 	features = btrfs_super_incompat_flags(disk_super);
@@ -2988,7 +2996,7 @@ int __cold open_ctree(struct super_block *sb,
 		btrfs_err(fs_info,
 "unequal nodesize/sectorsize (%u != %u) are not allowed for mixed block groups",
 			nodesize, sectorsize);
-		goto fail_csum;
+		goto fail_alloc;
 	}
 
 	/*
@@ -3004,7 +3012,7 @@ int __cold open_ctree(struct super_block *sb,
 	"cannot mount read-write because of unsupported optional features (%llx)",
 		       features);
 		err = -EINVAL;
-		goto fail_csum;
+		goto fail_alloc;
 	}
 
 	ret = btrfs_init_workqueues(fs_info, fs_devices);
@@ -3345,25 +3353,14 @@ int __cold open_ctree(struct super_block *sb,
 fail_sb_buffer:
 	btrfs_stop_all_workers(fs_info);
 	btrfs_free_block_groups(fs_info);
-fail_csum:
-	btrfs_free_csum_hash(fs_info);
 fail_alloc:
 fail_iput:
 	btrfs_mapping_tree_free(&fs_info->mapping_tree);
 
 	iput(fs_info->btree_inode);
-fail_bio_counter:
-	percpu_counter_destroy(&fs_info->dev_replace.bio_counter);
-fail_delalloc_bytes:
-	percpu_counter_destroy(&fs_info->delalloc_bytes);
-fail_dirty_metadata_bytes:
-	percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
-fail_dio_bytes:
-	percpu_counter_destroy(&fs_info->dio_bytes);
 fail_srcu:
 	cleanup_srcu_struct(&fs_info->subvol_srcu);
 fail:
-	btrfs_free_stripe_hash_table(fs_info);
 	btrfs_close_devices(fs_info->fs_devices);
 	return err;
 }
@@ -4060,16 +4057,7 @@ void __cold close_ctree(struct btrfs_fs_info *fs_info)
 
 	btrfs_mapping_tree_free(&fs_info->mapping_tree);
 	btrfs_close_devices(fs_info->fs_devices);
-
-	percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
-	percpu_counter_destroy(&fs_info->delalloc_bytes);
-	percpu_counter_destroy(&fs_info->dio_bytes);
-	percpu_counter_destroy(&fs_info->dev_replace.bio_counter);
 	cleanup_srcu_struct(&fs_info->subvol_srcu);
-
-	btrfs_free_csum_hash(fs_info);
-	btrfs_free_stripe_hash_table(fs_info);
-	btrfs_free_ref_cache(fs_info);
 }
 
 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
-- 
2.23.0