[PATCH] add -o flush for fat

Fat is commonly used on removable media.  Mounting with -o flush tells the
FS to write things to disk as quickly as possible.  It is like -o sync, but
much faster (and not as safe).

Signed-off-by: Chris Mason <mason@suse.com>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/fs/fat/file.c b/fs/fat/file.c
index 1ee25232e6af..d50fc47169c1 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -13,6 +13,7 @@
 #include <linux/smp_lock.h>
 #include <linux/buffer_head.h>
 #include <linux/writeback.h>
+#include <linux/blkdev.h>
 
 int fat_generic_ioctl(struct inode *inode, struct file *filp,
                       unsigned int cmd, unsigned long arg)
@@ -112,6 +113,16 @@ int fat_generic_ioctl(struct inode *inode, struct file *filp,
         }
 }
 
+static int fat_file_release(struct inode *inode, struct file *filp)
+{
+        if ((filp->f_mode & FMODE_WRITE) &&
+             MSDOS_SB(inode->i_sb)->options.flush) {
+                fat_flush_inodes(inode->i_sb, inode, NULL);
+                blk_congestion_wait(WRITE, HZ/10);
+        }
+        return 0;
+}
+
 const struct file_operations fat_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = do_sync_read,
@@ -121,6 +132,7 @@ const struct file_operations fat_file_operations = {
         .aio_read       = generic_file_aio_read,
         .aio_write      = generic_file_aio_write,
         .mmap           = generic_file_mmap,
+        .release        = fat_file_release,
         .ioctl          = fat_generic_ioctl,
         .fsync          = file_fsync,
         .sendfile       = generic_file_sendfile,
@@ -289,6 +301,7 @@ void fat_truncate(struct inode *inode)
         lock_kernel();
         fat_free(inode, nr_clusters);
         unlock_kernel();
+        fat_flush_inodes(inode->i_sb, inode, NULL);
 }
 
 struct inode_operations fat_file_inode_operations = {