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gfs2: Iomap cleanups and improvements

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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>
This commit is contained in:
Andreas Gruenbacher
2018-06-04 07:56:51 -05:00
committed by Bob Peterson
parent 845802b112
commit 628e366df1
4 changed files with 126 additions and 95 deletions
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6
fs/gfs2/file.c
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@@ -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;