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Subjectvfs: Add MS_FLUSHONFSYNC mount flag
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This mount flag will be used to determine whether the block device's write
cache should be flush or not on fsync()/fdatasync().

Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
---
diff -urNp linux-2.6.29-rc3-orig/fs/namespace.c linux-2.6.29-rc3/fs/namespace.c
--- linux-2.6.29-rc3-orig/fs/namespace.c 2009-01-29 09:47:51.000000000 +0900
+++ linux-2.6.29-rc3/fs/namespace.c 2009-01-29 18:40:04.000000000 +0900
@@ -1933,8 +1933,8 @@ long do_mount(char *dev_name, char *dir_
if (flags & MS_RDONLY)
mnt_flags |= MNT_READONLY;

- flags &= ~(MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_ACTIVE |
- MS_NOATIME | MS_NODIRATIME | MS_RELATIME| MS_KERNMOUNT);
+ flags &= ~(MS_NOSUID | MS_NODEV | MS_NOEXEC | MS_NOATIME |
+ MS_NODIRATIME | MS_RELATIME | MS_ACTIVE | MS_KERNMOUNT);

/* ... and get the mountpoint */
retval = kern_path(dir_name, LOOKUP_FOLLOW, &path);
diff -urNp linux-2.6.29-rc3-orig/include/linux/fs.h linux-2.6.29-rc3/include/linux/fs.h
--- linux-2.6.29-rc3-orig/include/linux/fs.h 2009-01-29 10:04:18.000000000 +0900
+++ linux-2.6.29-rc3/include/linux/fs.h 2009-01-29 10:24:14.000000000 +0900
@@ -135,6 +135,8 @@ struct inodes_stat_t {
#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
#define MS_I_VERSION (1<<23) /* Update inode I_version field */
+#define MS_FLUSHONFSYNC (1<<24) /* Force block device flush on
+ fsync()/fdatasync() */
#define MS_ACTIVE (1<<30)
#define MS_NOUSER (1<<31)




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