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authorBenjamin Marzinski <bmarzins@redhat.com>2012-05-29 23:01:09 -0500
committerSteven Whitehouse <swhiteho@redhat.com>2012-06-08 11:50:01 +0100
commit90306c41dc3d8e5f12ecd0193dae99e0e7f6e896 (patch)
tree344d0e0f62620dee784a824f30679e9a5d87696d /fs/gfs2/super.c
parentba1ddcb6ca0c46edd275790d1e4e2cfd6219ce19 (diff)
downloadlinux-90306c41dc3d8e5f12ecd0193dae99e0e7f6e896.tar.gz
GFS2: Use lvbs for storing rgrp information with mount option
Instead of reading in the resource groups when gfs2 is checking for free space to allocate from, gfs2 can store the necessary infromation in the resource group's lvb. Also, instead of searching for unlinked inodes in every resource group that's checked for free space, gfs2 can store the number of unlinked but inodes in the lvb, and only check for unlinked inodes if it will find some. The first time a resource group is locked, the lvb must initialized. Since this involves counting the unlinked inodes in the resource group, this takes a little extra time. But after that, if the resource group is locked with GL_SKIP, the buffer head won't be read in unless it's actually needed. Enabling the resource groups lvbs is done via the rgrplvb mount option. If this option isn't set, the lvbs will still be set and updated, but they won't be verfied or used by the filesystem. To safely turn on this option, all of the nodes mounting the filesystem must be running code with this patch, and the filesystem must have been completely unmounted since they were updated. Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/super.c')
-rw-r--r--fs/gfs2/super.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 81fc76264ed4..788068758f3a 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -78,6 +78,8 @@ enum {
Opt_quota_quantum,
Opt_barrier,
Opt_nobarrier,
+ Opt_rgrplvb,
+ Opt_norgrplvb,
Opt_error,
};
@@ -115,6 +117,8 @@ static const match_table_t tokens = {
{Opt_quota_quantum, "quota_quantum=%d"},
{Opt_barrier, "barrier"},
{Opt_nobarrier, "nobarrier"},
+ {Opt_rgrplvb, "rgrplvb"},
+ {Opt_norgrplvb, "norgrplvb"},
{Opt_error, NULL}
};
@@ -267,6 +271,12 @@ int gfs2_mount_args(struct gfs2_args *args, char *options)
case Opt_nobarrier:
args->ar_nobarrier = 1;
break;
+ case Opt_rgrplvb:
+ args->ar_rgrplvb = 1;
+ break;
+ case Opt_norgrplvb:
+ args->ar_rgrplvb = 0;
+ break;
case Opt_error:
default:
printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
@@ -1379,6 +1389,8 @@ static int gfs2_show_options(struct seq_file *s, struct dentry *root)
seq_printf(s, ",nobarrier");
if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
seq_printf(s, ",demote_interface_used");
+ if (args->ar_rgrplvb)
+ seq_printf(s, ",rgrplvb");
return 0;
}