hfsplus: flush disk caches in sync and fsync

Flush the disk cache in fsync and sync to make sure data actually is
on disk on completion of these system calls.  There is a nobarrier
mount option to disable this behaviour.  It's slightly misnamed now
that barrier actually are gone, but it matches the name used by all
major filesystems.

Signed-off-by: Christoph Hellwig <hch@tuxera.com>

4 files changed, 21 insertions, 0 deletions

diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
index 65c698f78ef7..17ac254e72cb 100644
--- a/fs/hfsplus/hfsplus_fs.h
+++ b/fs/hfsplus/hfsplus_fs.h
@@ -156,6 +156,7 @@ struct hfsplus_sb_info {
 #define HFSPLUS_SB_FORCE        2
 #define HFSPLUS_SB_HFSX         3
 #define HFSPLUS_SB_CASEFOLD     4
+#define HFSPLUS_SB_NOBARRIER    5
 
 static inline struct hfsplus_sb_info *HFSPLUS_SB(struct super_block *sb)
 {
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index bf6535b73261..bda7464c205d 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -8,6 +8,7 @@
  * Inode handling routines
  */
 
+#include <linux/blkdev.h>
 #include <linux/mm.h>
 #include <linux/fs.h>
 #include <linux/pagemap.h>
@@ -334,6 +335,9 @@ int hfsplus_file_fsync(struct file *file, int datasync)
                         error = error2;
         }
 
+        if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
+                blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
+
         return error;
 }
 
diff --git a/fs/hfsplus/options.c b/fs/hfsplus/options.c
index 43b02b5525eb..dbd9d0c426cb 100644
--- a/fs/hfsplus/options.c
+++ b/fs/hfsplus/options.c
@@ -23,6 +23,7 @@ enum {
         opt_umask, opt_uid, opt_gid,
         opt_part, opt_session, opt_nls,
         opt_nodecompose, opt_decompose,
+        opt_barrier, opt_nobarrier,
         opt_force, opt_err
 };
 
@@ -37,6 +38,8 @@ static const match_table_t tokens = {
         { opt_nls, "nls=%s" },
         { opt_decompose, "decompose" },
         { opt_nodecompose, "nodecompose" },
+        { opt_barrier, "barrier" },
+        { opt_nobarrier, "nobarrier" },
         { opt_force, "force" },
         { opt_err, NULL }
 };
@@ -174,6 +177,12 @@ int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi)
                 case opt_nodecompose:
                         set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
                         break;
+                case opt_barrier:
+                        clear_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
+                        break;
+                case opt_nobarrier:
+                        set_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
+                        break;
                 case opt_force:
                         set_bit(HFSPLUS_SB_FORCE, &sbi->flags);
                         break;
@@ -212,5 +221,7 @@ int hfsplus_show_options(struct seq_file *seq, struct vfsmount *mnt)
                 seq_printf(seq, ",nls=%s", sbi->nls->charset);
         if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags))
                 seq_printf(seq, ",nodecompose");
+        if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
+                seq_printf(seq, ",nobarrier");
         return 0;
 }
diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index 036650123c4c..154478c71f25 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -10,6 +10,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/pagemap.h>
+#include <linux/blkdev.h>
 #include <linux/fs.h>
 #include <linux/slab.h>
 #include <linux/vfs.h>
@@ -212,6 +213,10 @@ int hfsplus_sync_fs(struct super_block *sb, int wait)
 out:
         mutex_unlock(&sbi->alloc_mutex);
         mutex_unlock(&sbi->vh_mutex);
+
+        if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
+                blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
+
         return error;
 }