ext4-update-i_disksize-for-fallocate.patch

   1 ext4: Update i_disksize properly when allocating from fallocate area.
   2
   3 From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
   4
   5 When allocating unitialized space at the end of file which had been
   6 preallocated with the FALLOC_FL_KEEP_SIZE option, the file size is not
   7 updated at that time.  But the later we are not updating the file size
   8 when writing to that preallocated space.
   9
  10 These changes are for code correctness.  This patch allows us to update
  11 the i_disksize at the write_end() callback of filesystem properly.
  12
  13 Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
  14 Signed-off-by: Mingming Cao <cmm@us.ibm.com>
  15 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
  16 ---
  17  fs/ext4/extents.c |    6 +++---
  18  1 file changed, 3 insertions(+), 3 deletions(-)
  19
  20 Index: linux-2.6.26-rc6/fs/ext4/extents.c
  21 ===================================================================
  22 --- linux-2.6.26-rc6.orig/fs/ext4/extents.c     2008-06-17 10:43:20.000000000 -0700
  23 +++ linux-2.6.26-rc6/fs/ext4/extents.c  2008-06-17 10:43:28.000000000 -0700
  24 @@ -2716,13 +2716,13 @@ int ext4_ext_get_blocks(handle_t *handle
  25                 goto out2;
  26         }
  27
  28 -       if (extend_disksize && inode->i_size > EXT4_I(inode)->i_disksize)
  29 -               EXT4_I(inode)->i_disksize = inode->i_size;
  30 -
  31         /* previous routine could use block we allocated */
  32         newblock = ext_pblock(&newex);
  33         allocated = ext4_ext_get_actual_len(&newex);
  34  outnew:
  35 +       if (extend_disksize && inode->i_size > EXT4_I(inode)->i_disksize)
  36 +               EXT4_I(inode)->i_disksize = inode->i_size;
  37 +
  38         __set_bit(BH_New, &bh_result->b_state);
  39
  40         /* Cache only when it is _not_ an uninitialized extent */