[PATCH] FAT: miss-sync issues on sync mount (miss-sync on write)

This patch fixes miss-sync issue on write() system call.  This updates
inode attrs flags, mtime and ctime on every comit_write call, due to
locking.

Signed-off-by: Hiroyuki Machida <machida@sm.sony.co.jp>
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 16 insertions, 36 deletions

diff --git a/fs/fat/file.c b/fs/fat/file.c
index 62ffa9139400..7134403d5be2 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -12,39 +12,6 @@
 #include <linux/smp_lock.h>
 #include <linux/buffer_head.h>
 
-static ssize_t fat_file_aio_write(struct kiocb *iocb, const char __user *buf,
-                                  size_t count, loff_t pos)
-{
-        struct inode *inode = iocb->ki_filp->f_dentry->d_inode;
-        int retval;
-
-        retval = generic_file_aio_write(iocb, buf, count, pos);
-        if (retval > 0) {
-                inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
-                MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
-                mark_inode_dirty(inode);
-//              check the locking rules
-//              if (IS_SYNC(inode))
-//                      fat_sync_inode(inode);
-        }
-        return retval;
-}
-
-static ssize_t fat_file_writev(struct file *filp, const struct iovec *iov,
-                               unsigned long nr_segs, loff_t *ppos)
-{
-        struct inode *inode = filp->f_dentry->d_inode;
-        int retval;
-
-        retval = generic_file_writev(filp, iov, nr_segs, ppos);
-        if (retval > 0) {
-                inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
-                MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
-                mark_inode_dirty(inode);
-        }
-        return retval;
-}
-
 int fat_generic_ioctl(struct inode *inode, struct file *filp,
                       unsigned int cmd, unsigned long arg)
 {
@@ -148,9 +115,9 @@ struct file_operations fat_file_operations = {
         .read           = do_sync_read,
         .write          = do_sync_write,
         .readv          = generic_file_readv,
-        .writev         = fat_file_writev,
+        .writev         = generic_file_writev,
         .aio_read       = generic_file_aio_read,
-        .aio_write      = fat_file_aio_write,
+        .aio_write      = generic_file_aio_write,
         .mmap           = generic_file_mmap,
         .ioctl          = fat_generic_ioctl,
         .fsync          = file_fsync,
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index a7cbe68e2259..51b1d15d9d5c 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -102,6 +102,19 @@ static int fat_prepare_write(struct file *file, struct page *page,
                                   &MSDOS_I(page->mapping->host)->mmu_private);
 }
 
+static int fat_commit_write(struct file *file, struct page *page,
+                            unsigned from, unsigned to)
+{
+        struct inode *inode = page->mapping->host;
+        int err = generic_commit_write(file, page, from, to);
+        if (!err && !(MSDOS_I(inode)->i_attrs & ATTR_ARCH)) {
+                inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
+                MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
+                mark_inode_dirty(inode);
+        }
+        return err;
+}
+
 static sector_t _fat_bmap(struct address_space *mapping, sector_t block)
 {
         return generic_block_bmap(mapping, block, fat_get_block);
@@ -112,7 +125,7 @@ static struct address_space_operations fat_aops = {
         .writepage      = fat_writepage,
         .sync_page      = block_sync_page,
         .prepare_write  = fat_prepare_write,
-        .commit_write   = generic_commit_write,
+        .commit_write   = fat_commit_write,
         .bmap           = _fat_bmap
 };