ceph: fix sync and dio writes across stripe boundaries
We were iterating across stripe boundaries properly, but not moving the
write buffer pointer forward. This caused us to rewrite the same data
after the break. Fix by adjusting the data pointer forward, and
recalculating the io and buffer alignment after the break.
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 2be0f35..4698a5c 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -476,9 +476,6 @@
else
pos = *offset;
- io_align = pos & ~PAGE_MASK;
- buf_align = (unsigned long)data & ~PAGE_MASK;
-
ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + left);
if (ret < 0)
return ret;
@@ -502,6 +499,8 @@
* boundary. this isn't atomic, unfortunately. :(
*/
more:
+ io_align = pos & ~PAGE_MASK;
+ buf_align = (unsigned long)data & ~PAGE_MASK;
len = left;
if (file->f_flags & O_DIRECT) {
/* write from beginning of first page, regardless of
@@ -591,6 +590,7 @@
pos += len;
written += len;
left -= len;
+ data += written;
if (left)
goto more;
