ext4: make sure ext4_has_free_blocks returns 0 for ENOSPC

Fix ext4_has_free_blocks() to return 0 when we don't have enough space.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 1ae5004e93fc..e9fa960ba6da 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -1626,6 +1626,9 @@ ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
                 free_blocks =
                         percpu_counter_sum_and_set(&sbi->s_freeblocks_counter);
 #endif
+        if (free_blocks <= root_blocks)
+                /* we don't have free space */
+                return 0;
         if (free_blocks - root_blocks < nblocks)
                 return free_blocks - root_blocks;
         return nblocks;