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authorSteven Whitehouse <swhiteho@redhat.com>2013-12-06 14:16:14 +0400
committerSteven Whitehouse <swhiteho@redhat.com>2014-01-03 14:00:31 +0400
commit7005c3e4ae42858dbb695b2d03d340af799b1f1b (patch)
tree25e3ce7a1dccb1784ca1b09f03a0382265b82370 /fs/gfs2/incore.h
parent7de41d36ff5885141a16c74a044936cf878c770f (diff)
downloadlinux-7005c3e4ae42858dbb695b2d03d340af799b1f1b.tar.xz
GFS2: Use range based functions for rgrp sync/invalidation
Each rgrp header is represented as a single extent on disk, so we can calculate the position within the address space, since we are using address spaces mapped 1:1 to the disk. This means that it is possible to use the range based versions of filemap_fdatawrite/wait and for invalidating the page cache. Our eventual intent is to then be able to merge the address spaces used for rgrps into a single address space, rather than to have one for each glock, saving memory and reducing complexity. Since during umount, the rgrp structures are disposed of before the glocks, we need to store the extent information in the glock so that is is available for a final invalidation. This patch uses a field which is otherwise unused in rgrp glocks to do that, so that we do not have to expand the size of a glock. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/incore.h')
-rw-r--r--fs/gfs2/incore.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 01328162c952..e6544ee0c137 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -351,7 +351,15 @@ struct gfs2_glock {
atomic_t gl_ail_count;
atomic_t gl_revokes;
struct delayed_work gl_work;
- struct work_struct gl_delete;
+ union {
+ /* For inode and iopen glocks only */
+ struct work_struct gl_delete;
+ /* For rgrp glocks only */
+ struct {
+ loff_t start;
+ loff_t end;
+ } gl_vm;
+ };
struct rcu_head gl_rcu;
};