ext4: release reserved quota when block reservation for delalloc retry

ext4_da_reserve_space() can reserve quota blocks multiple times if
ext4_claim_free_blocks() fail and we retry the allocation. We should
release the quota reservation before restarting.

Bug found by Jan Kara.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 20e2d70..219067c 100644 (file)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1854,11 +1854,11 @@ repeat:
 
        if (ext4_claim_free_blocks(sbi, total)) {
                spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
+               vfs_dq_release_reservation_block(inode, total);
                if (ext4_should_retry_alloc(inode->i_sb, &retries)) {
                        yield();
                        goto repeat;
                }
-               vfs_dq_release_reservation_block(inode, total);
                return -ENOSPC;
        }
        EXT4_I(inode)->i_reserved_data_blocks += nrblocks;