fs: restore nobh

Implement nobh in new aops.  This is a bit tricky.  FWIW, nobh_truncate is
now implemented in a way that does not create blocks in sparse regions,
which is a silly thing for it to have been doing (isn't it?)

ext2 survives fsx and fsstress. jfs is converted as well... ext3
should be easy to do (but not done yet).

[akpm@linux-foundation.org: coding-style fixes]
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 4 deletions

diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
index 6af378563611..4672013802e1 100644
--- a/fs/jfs/inode.c
+++ b/fs/jfs/inode.c
@@ -279,8 +279,7 @@ static int jfs_write_begin(struct file *file, struct address_space *mapping,
                                 loff_t pos, unsigned len, unsigned flags,
                                 struct page **pagep, void **fsdata)
 {
-        *pagep = NULL;
-        return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
+        return nobh_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
                                 jfs_get_block);
 }
 
@@ -306,7 +305,7 @@ const struct address_space_operations jfs_aops = {
         .writepages     = jfs_writepages,
         .sync_page      = block_sync_page,
         .write_begin    = jfs_write_begin,
-        .write_end      = generic_write_end,
+        .write_end      = nobh_write_end,
         .bmap           = jfs_bmap,
         .direct_IO      = jfs_direct_IO,
 };
@@ -359,7 +358,7 @@ void jfs_truncate(struct inode *ip)
 {
         jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
 
-        block_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);
+        nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);
 
         IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
         jfs_truncate_nolock(ip, ip->i_size);