linux-2.6-900-ext3_mount_default_to_barrier.patch

   1 commit 79eb79ed8e042e446accad244073af0f9bf4f35d
   2 Author: S.Çağlar Onur <caglar@cs.princeton.edu>
   3 Date:   Fri Mar 19 10:17:24 2010 -0400
   4
   5     make_ext3_mount_default_to_barrier=1
   6
   7 diff --git a/fs/ext3/fsync.c b/fs/ext3/fsync.c
   8 index 00c9597..841f0f7 100644
   9 --- a/fs/ext3/fsync.c
  10 +++ b/fs/ext3/fsync.c
  11 @@ -27,6 +27,7 @@
  12  #include <linux/sched.h>
  13  #include <linux/writeback.h>
  14  #include <linux/jbd.h>
  15 +#include <linux/blkdev.h>
  16  #include <linux/ext3_fs.h>
  17  #include <linux/ext3_jbd.h>
  18
  19 @@ -84,7 +85,10 @@ int ext3_sync_file(struct file * file, struct dentry *dentry, int datasync)
  20                         .sync_mode = WB_SYNC_ALL,
  21                         .nr_to_write = 0, /* sys_fsync did this */
  22                 };
  23 +               journal_t *journal = EXT3_SB(inode->i_sb)->s_journal;
  24                 ret = sync_inode(inode, &wbc);
  25 +               if (journal && (journal->j_flags & JFS_BARRIER))
  26 +                       blkdev_issue_flush(inode->i_sb->s_bdev, NULL);
  27         }
  28  out:
  29         return ret;
  30 diff --git a/fs/ext3/super.c b/fs/ext3/super.c
  31 index 7facb78..ce186bc 100644
  32 --- a/fs/ext3/super.c
  33 +++ b/fs/ext3/super.c
  34 @@ -1504,6 +1504,8 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
  35         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
  36         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
  37
  38 +       /* enable barriers by default */
  39 +       set_opt(sbi->s_mount_opt, BARRIER);
  40         set_opt(sbi->s_mount_opt, RESERVATION);
  41
  42         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,