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authorBenjamin Marzinski <bmarzins@redhat.com>2010-08-20 00:21:02 -0500
committerSteven Whitehouse <swhiteho@redhat.com>2010-09-20 11:19:17 +0100
commit3921120e757f9167f3fcd3a1781239824471b14d (patch)
tree4b5f8e9e5376ae6a64b9757a62392b89a6316e26 /fs/gfs2/incore.h
parent9a3f236d40a99ea8dca3df40d8ef67631057cad6 (diff)
GFS2: fallocate support
This patch adds support for fallocate to gfs2. Since the gfs2 does not support uninitialized data blocks, it must write out zeros to all the blocks. However, since it does not need to lock any pages to read from, gfs2 can write out the zero blocks much more efficiently. On a moderately full filesystem, fallocate works around 5 times faster on average. The fallocate call also allows gfs2 to add blocks to the file without changing the filesize, which will make it possible for gfs2 to preallocate space for the rindex file, so that gfs2 can grow a completely full filesystem. Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/incore.h')
-rw-r--r--fs/gfs2/incore.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index c1197177527..578234bb03f 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -571,6 +571,7 @@ struct gfs2_sbd {
struct list_head sd_rindex_mru_list;
struct gfs2_rgrpd *sd_rindex_forward;
unsigned int sd_rgrps;
+ unsigned int sd_max_rg_data;
/* Journal index stuff */