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| author | Steven Whitehouse <swhiteho@redhat.com> | 2013-12-06 16:19:54 +0000 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2014-01-03 10:01:50 +0000 |
| commit | 70d4ee94b370c5ef54d0870600f16bd92d18013c (patch) | |
| tree | ae741f94eba92bdb6e2882145de03be662557f66 /fs/gfs2/meta_io.c | |
| parent | 7005c3e4ae42858dbb695b2d03d340af799b1f1b (diff) | |
| download | op-kernel-dev-70d4ee94b370c5ef54d0870600f16bd92d18013c.zip op-kernel-dev-70d4ee94b370c5ef54d0870600f16bd92d18013c.tar.gz | |
GFS2: Use only a single address space for rgrps
Prior to this patch, GFS2 had one address space for each rgrp,
stored in the glock. This patch changes them to use a single
address space in the super block. This therefore saves
(sizeof(struct address_space) * nr_of_rgrps) bytes of memory
and for large filesystems, that can be significant.
It would be nice to be able to do something similar and merge
the inode metadata address space into the same global
address space. However, that is rather more complicated as the
on-disk location doesn't have a 1:1 mapping with the inodes in
general. So while it could be done, it will be a more complicated
operation as it requires changing a lot more code paths.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/meta_io.c')
| -rw-r--r-- | fs/gfs2/meta_io.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c index 52f177b..c7f2469 100644 --- a/fs/gfs2/meta_io.c +++ b/fs/gfs2/meta_io.c @@ -116,6 +116,9 @@ struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create) unsigned long index; unsigned int bufnum; + if (mapping == NULL) + mapping = &sdp->sd_aspace; + shift = PAGE_CACHE_SHIFT - sdp->sd_sb.sb_bsize_shift; index = blkno >> shift; /* convert block to page */ bufnum = blkno - (index << shift); /* block buf index within page */ |
