ext4: Fix s_dirty_blocks_counter if block allocation failed with nodelalloc

(cherry picked from commit 0087d9fb3f29f59e8d42c8b058376d80e5adde4c)

With nodelalloc option we need to update the dirty block counter on
block allocation failure. This is needed because we increment the
dirty block counter early in the block allocation phase. Without
the patch s_dirty_blocks_counter goes wrong so that filesystem's
free blocks decreases incorrectly.

Tested-by: Akira Fujita <a-fujita@rs.jp.nec.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 8d7f8a1e5920bd1c4cde2b6d74c40855afc6631e..775ef321bbf5ef8059ad29379b16223dde6b6df3 100644 (file)
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4538,7 +4538,7 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
        }
        if (ar->len == 0) {
                *errp = -EDQUOT;
-               return 0;
+               goto out3;
        }
        inquota = ar->len;
 
@@ -4611,6 +4611,13 @@ out2:
 out1:
        if (ar->len < inquota)
                DQUOT_FREE_BLOCK(ar->inode, inquota - ar->len);
+out3:
+       if (!ar->len) {
+               if (!EXT4_I(ar->inode)->i_delalloc_reserved_flag)
+                       /* release all the reserved blocks if non delalloc */
+                       percpu_counter_sub(&sbi->s_dirtyblocks_counter,
+                                               reserv_blks);
+       }
 
        return block;
 }