[GFS2] Use ->page_mkwrite() for mmap()

This cleans up the mmap() code path for GFS2 by implementing the
page_mkwrite function for GFS2. We are thus able to use the
generic filemap_fault function for our ->fault() implementation.

This now means that shared writable mappings will be much more
efficiently shared across the cluster if there is a reasonable
proportion of read activity (the greater proportion, the better).

As a side effect, it also reduces the size of the code, removes
special cases from readpage and readpages, and makes the code
path easier to follow.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 0 insertions, 8 deletions

diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 662182bfbff7..55c72f01cf31 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -241,7 +241,6 @@ struct gfs2_alloc {
 enum {
         GIF_INVALID             = 0,
         GIF_QD_LOCKED           = 1,
-        GIF_PAGED               = 2,
         GIF_SW_PAGED            = 3,
 };
 
@@ -289,19 +288,12 @@ static inline struct gfs2_inode *GFS2_I(struct inode *inode)
         return container_of(inode, struct gfs2_inode, i_inode);
 }
 
-/* To be removed? */
 static inline struct gfs2_sbd *GFS2_SB(struct inode *inode)
 {
         return inode->i_sb->s_fs_info;
 }
 
-enum {
-        GFF_DID_DIRECT_ALLOC    = 0,
-        GFF_EXLOCK = 1,
-};
-
 struct gfs2_file {
-        unsigned long f_flags;          /* GFF_... */
         struct mutex f_fl_mutex;
         struct gfs2_holder f_fl_gh;
 };