ext4: fix error processing in mb_free_blocks

The error processing of the return value of mb_free_blocks is meanless
because it only returns 0.  This fix includes

- make mb_free_blocks return void

- remove the error processing part in callers

- unlock group before calling ext4_error in mb_free_blocks

Signed-off-by: Shen Feng <shen@cn.fujitsu.com>
Cc: Mingming Cao <cmm@us.ibm.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

1 files changed, 5 insertions, 8 deletions

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 771a1d608528..b882868f4661 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -1051,7 +1051,7 @@ static void mb_set_bits(spinlock_t *lock, void *bm, int cur, int len)
         }
 }
 
-static int mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
+static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
                           int first, int count)
 {
         int block = 0;
@@ -1091,11 +1091,12 @@ static int mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
                         blocknr += block;
                         blocknr +=
                             le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
-
+                        ext4_unlock_group(sb, e4b->bd_group);
                         ext4_error(sb, __func__, "double-free of inode"
                                    " %lu's block %llu(bit %u in group %lu)\n",
                                    inode ? inode->i_ino : 0, blocknr, block,
                                    e4b->bd_group);
+                        ext4_lock_group(sb, e4b->bd_group);
                 }
                 mb_clear_bit(block, EXT4_MB_BITMAP(e4b));
                 e4b->bd_info->bb_counters[order]++;
@@ -1133,8 +1134,6 @@ static int mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
                 } while (1);
         }
         mb_check_buddy(e4b);
-
-        return 0;
 }
 
 static int mb_find_extent(struct ext4_buddy *e4b, int order, int block,
@@ -2570,8 +2569,7 @@ ext4_mb_free_committed_blocks(struct super_block *sb)
                 ext4_lock_group(sb, md->group);
                 for (i = 0; i < md->num; i++) {
                         mb_debug(" %u", md->blocks[i]);
-                        err = mb_free_blocks(NULL, &e4b, md->blocks[i], 1);
-                        BUG_ON(err != 0);
+                        mb_free_blocks(NULL, &e4b, md->blocks[i], 1);
                 }
                 mb_debug("\n");
                 ext4_unlock_group(sb, md->group);
@@ -4333,10 +4331,9 @@ do_more:
                 ext4_mb_free_metadata(handle, &e4b, block_group, bit, count);
         } else {
                 ext4_lock_group(sb, block_group);
-                err = mb_free_blocks(inode, &e4b, bit, count);
+                mb_free_blocks(inode, &e4b, bit, count);
                 ext4_mb_return_to_preallocation(inode, &e4b, block, count);
                 ext4_unlock_group(sb, block_group);
-                BUG_ON(err != 0);
         }
 
         spin_lock(sb_bgl_lock(sbi, block_group));