[GFS2] Readpages support

This adds readpages support (and also corrects a small bug in
the readpage error path at the same time). Hopefully this will
improve performance by allowing GFS to submit larger lumps of
I/O at a time.

In order to simplify the setting of BH_Boundary, it currently gets
set when we hit the end of a indirect pointer block. There is
always a boundary at this point with the current allocation code.
It doesn't get all the boundaries right though, so there is still
room for improvement in this.

See comments in fs/gfs2/ops_address.c for further information about
readpages with GFS2.

Signed-off-by: Steven Whitehouse

1 files changed, 2 insertions, 3 deletions

diff --git a/fs/gfs2/bmap.h b/fs/gfs2/bmap.h
index 23fb6589d5e..bc46c114912 100644
--- a/fs/gfs2/bmap.h
+++ b/fs/gfs2/bmap.h
@@ -16,9 +16,8 @@ typedef int (*gfs2_unstuffer_t) (struct gfs2_inode * ip,
 int gfs2_unstuff_dinode(struct gfs2_inode *ip, gfs2_unstuffer_t unstuffer,
 			void *private);
 
-int gfs2_block_map(struct gfs2_inode *ip,
-		   uint64_t lblock, int *new,
-		   uint64_t *dblock, uint32_t *extlen);
+int gfs2_block_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, int *boundary);
+int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen);
 
 int gfs2_truncatei(struct gfs2_inode *ip, uint64_t size);
 int gfs2_truncatei_resume(struct gfs2_inode *ip);