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authorSteven Whitehouse <swhiteho@redhat.com>2012-02-24 15:09:14 +0000
committerSteven Whitehouse <swhiteho@redhat.com>2012-02-28 09:52:39 +0000
commita365fbf354907430e6852f0c373b4b3eeff81ba3 (patch)
tree65d5ed095e3150d6061860f5aefd150a5ab76cfd /fs/gfs2/rgrp.c
parent9e73f571ea3afffca78c1f54128d57796e27532f (diff)
downloadop-kernel-dev-a365fbf354907430e6852f0c373b4b3eeff81ba3.zip
op-kernel-dev-a365fbf354907430e6852f0c373b4b3eeff81ba3.tar.gz
GFS2: Read resource groups on mount
This makes mount take slightly longer, but at the same time, the first write to the filesystem will be faster too. It also means that if there is a problem in the resource index, then we can refuse to mount rather than having to try and report that when the first write occurs. In addition, to avoid recursive locking, we hvae to take account of instances when the rindex glock may already be held when we are trying to update the rbtree of resource groups. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/rgrp.c')
-rw-r--r--fs/gfs2/rgrp.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 981bfa3..49ada95 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -683,16 +683,21 @@ int gfs2_rindex_update(struct gfs2_sbd *sdp)
struct gfs2_glock *gl = ip->i_gl;
struct gfs2_holder ri_gh;
int error = 0;
+ int unlock_required = 0;
/* Read new copy from disk if we don't have the latest */
if (!sdp->sd_rindex_uptodate) {
mutex_lock(&sdp->sd_rindex_mutex);
- error = gfs2_glock_nq_init(gl, LM_ST_SHARED, 0, &ri_gh);
- if (error)
- return error;
+ if (!gfs2_glock_is_locked_by_me(gl)) {
+ error = gfs2_glock_nq_init(gl, LM_ST_SHARED, 0, &ri_gh);
+ if (error)
+ return error;
+ unlock_required = 1;
+ }
if (!sdp->sd_rindex_uptodate)
error = gfs2_ri_update(ip);
- gfs2_glock_dq_uninit(&ri_gh);
+ if (unlock_required)
+ gfs2_glock_dq_uninit(&ri_gh);
mutex_unlock(&sdp->sd_rindex_mutex);
}
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