gfs2: Iomap cleanups and improvements

Clean up gfs2_iomap_alloc and gfs2_iomap_get.  Document how
gfs2_iomap_alloc works: it now needs to be called separately after
gfs2_iomap_get where necessary; this will be used later by iomap write.
Move gfs2_iomap_ops into bmap.c.

Introduce a new gfs2_iomap_get_alloc helper and use it in
fallocate_chunk: gfs2_iomap_begin will become unsuitable for fallocate
with proper iomap write support.

In gfs2_block_map and fallocate_chunk, zero-initialize struct iomap.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 4b71f021a9e2..7137db7b0119 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -733,7 +733,7 @@ static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
         struct gfs2_inode *ip = GFS2_I(inode);
         loff_t end = offset + len;
         struct buffer_head *dibh;
-        struct iomap iomap;
+        struct iomap iomap = { };
         int error;
 
         error = gfs2_meta_inode_buffer(ip, &dibh);
@@ -749,8 +749,8 @@ static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
         }
 
         while (offset < end) {
-                error = gfs2_iomap_begin(inode, offset, end - offset,
-                                         IOMAP_WRITE, &iomap);
+                error = gfs2_iomap_get_alloc(inode, offset, end - offset,
+                                             &iomap);
                 if (error)
                         goto out;
                 offset = iomap.offset + iomap.length;