ext4: fix async i/o writes beyond 4GB to a sparse file

The "offset" member in ext4_io_end holds bytes, not blocks, so
ext4_lblk_t is wrong - and too small (u32).

This caused the async i/o writes to sparse files beyond 4GB to fail
when they wrapped around to 0.

Also fix up the type of arguments to ext4_convert_unwritten_extents(),
it gets ssize_t from ext4_end_aio_dio_nolock() and
ext4_ext_direct_IO().

Reported-by: Giel de Nijs <giel@vectorwise.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>

3 files changed, 5 insertions, 5 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 874d169a193e..602d5ad6f5e7 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -139,8 +139,8 @@ typedef struct ext4_io_end {
         struct inode            *inode;         /* file being written to */
         unsigned int            flag;           /* unwritten or not */
         int                     error;          /* I/O error code */
-        ext4_lblk_t             offset;         /* offset in the file */
-        size_t                  size;           /* size of the extent */
+        loff_t                  offset;         /* offset in the file */
+        ssize_t                 size;           /* size of the extent */
         struct work_struct      work;           /* data work queue */
 } ext4_io_end_t;
 
@@ -1744,7 +1744,7 @@ extern void ext4_ext_release(struct super_block *);
 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
                           loff_t len);
 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
-                          loff_t len);
+                          ssize_t len);
 extern int ext4_get_blocks(handle_t *handle, struct inode *inode,
                            sector_t block, unsigned int max_blocks,
                            struct buffer_head *bh, int flags);
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 765a4826b118..c56877972b0e 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3603,7 +3603,7 @@ retry:
  * Returns 0 on success.
  */
 int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
-                                    loff_t len)
+                                    ssize_t len)
 {
         handle_t *handle;
         ext4_lblk_t block;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index e11952404e02..2059c34ac4c8 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3551,7 +3551,7 @@ static int ext4_end_aio_dio_nolock(ext4_io_end_t *io)
 {
         struct inode *inode = io->inode;
         loff_t offset = io->offset;
-        size_t size = io->size;
+        ssize_t size = io->size;
         int ret = 0;
 
         ext4_debug("end_aio_dio_onlock: io 0x%p from inode %lu,list->next 0x%p,"