fs/direct-io.c: calculate fs_count correctly in get_more_blocks()

In get_more_blocks(), we use dio_count to calcuate fs_count and do some
tricky things to increase fs_count if dio_count isn't aligned.  But
actually it still has some corner cases that can't be coverd.  See the
following example:

	dio_write foo -s 1024 -w 4096

(direct write 4096 bytes at offset 1024).  The same goes if the offset
isn't aligned to fs_blocksize.

In this case, the old calculation counts fs_count to be 1, but actually we
will write into 2 different blocks (if fs_blocksize=4096).  The old code
just works, since it will call get_block twice (and may have to allocate
and create extents twice for filesystems like ext4).  So we'd better call
get_block just once with the proper fs_count.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 7 deletions

diff --git a/fs/direct-io.c b/fs/direct-io.c
index d740ab67ff6e..389863f59cda 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -580,9 +580,8 @@ static int get_more_blocks(struct dio *dio, struct dio_submit *sdio,
 {
         int ret;
         sector_t fs_startblk;   /* Into file, in filesystem-sized blocks */
+        sector_t fs_endblk;     /* Into file, in filesystem-sized blocks */
         unsigned long fs_count; /* Number of filesystem-sized blocks */
-        unsigned long dio_count;/* Number of dio_block-sized blocks */
-        unsigned long blkmask;
         int create;
 
         /*
@@ -593,11 +592,9 @@ static int get_more_blocks(struct dio *dio, struct dio_submit *sdio,
         if (ret == 0) {
                 BUG_ON(sdio->block_in_file >= sdio->final_block_in_request);
                 fs_startblk = sdio->block_in_file >> sdio->blkfactor;
-                dio_count = sdio->final_block_in_request - sdio->block_in_file;
-                fs_count = dio_count >> sdio->blkfactor;
-                blkmask = (1 << sdio->blkfactor) - 1;
-                if (dio_count & blkmask)        
-                        fs_count++;
+                fs_endblk = (sdio->final_block_in_request - 1) >>
+                                        sdio->blkfactor;
+                fs_count = fs_endblk - fs_startblk + 1;
 
                 map_bh->b_state = 0;
                 map_bh->b_size = fs_count << dio->inode->i_blkbits;