ext4_has_free_blocks_fix.patch

   1 ext4: make sure ext4_has_free_blocks returns 0 for ENOSPC
   2
   3 From: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
   4
   5 Fix ext4_has_free_blocks() to return 0 when we don't have enough space.
   6
   7 Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
   8 Signed-off-by: Mingming Cao <cmm@us.ibm.com>
   9 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
  10 ---
  11
  12  fs/ext4/balloc.c |    3 +++
  13  1 file changed, 3 insertions(+)
  14
  15 Index: linux-2.6.27-rc3/fs/ext4/balloc.c
  16 ===================================================================
  17 --- linux-2.6.27-rc3.orig/fs/ext4/balloc.c      2008-08-18 11:38:07.000000000 -0700
  18 +++ linux-2.6.27-rc3/fs/ext4/balloc.c   2008-08-18 11:40:12.000000000 -0700
  19 @@ -1626,6 +1626,9 @@ ext4_fsblk_t ext4_has_free_blocks(struct
  20                 free_blocks =
  21                         percpu_counter_sum_and_set(&sbi->s_freeblocks_counter);
  22  #endif
  23 +       if (free_blocks <= root_blocks)
  24 +               /* we don't have free space */
  25 +               return 0;
  26         if (free_blocks - root_blocks < nblocks)
  27                 return free_blocks - root_blocks;
  28         return nblocks;