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authorBob Peterson <rpeterso@redhat.com>2013-11-06 10:58:00 -0500
committerSteven Whitehouse <swhiteho@redhat.com>2014-01-03 09:57:31 +0000
commit1330edbeaf304703052fb583dd660b96309e4536 (patch)
treeed15177cde85caba12da64d7596b7c27377a0a7a
parent5ce13431dd3365d5dd4f3890394dac59b687c0ed (diff)
GFS2: Drop inadequate rgrps from the reservation tree
This is just basically a resend of a patch I posted earlier. It didn't change from its original, except in diff offsets, etc: This patch fixes a bug in the GFS2 block allocation code. The problem starts if a process already has a multi-block reservation, but for some reason, another process disqualifies it from further allocations. For example, the other process might set on the GFS2_RDF_ERROR bit. The process holding the reservation jumps to label skip_rgrp, but that label comes after the code that removes the reservation from the tree. Therefore, the no longer usable reservation is not removed from the rgrp's reservations tree; it's lost. Eventually, the lost reservation causes the count of reserved blocks to get off, and eventually that causes a BUG_ON(rs->rs_rbm.rgd->rd_reserved < rs->rs_free) to trigger. This patch moves the call to after label skip_rgrp so that the disqualified reservation is properly removed from the tree, thus keeping the rgrp rd_reserved count sane. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
-rw-r--r--fs/gfs2/rgrp.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 809fecd82970..1ccf89ab42b6 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1944,15 +1944,16 @@ int gfs2_inplace_reserve(struct gfs2_inode *ip, const struct gfs2_alloc_parms *a
return 0;
}
- /* Drop reservation, if we couldn't use reserved rgrp */
- if (gfs2_rs_active(rs))
- gfs2_rs_deltree(rs);
check_rgrp:
/* Check for unlinked inodes which can be reclaimed */
if (rs->rs_rbm.rgd->rd_flags & GFS2_RDF_CHECK)
try_rgrp_unlink(rs->rs_rbm.rgd, &last_unlinked,
ip->i_no_addr);
skip_rgrp:
+ /* Drop reservation, if we couldn't use reserved rgrp */
+ if (gfs2_rs_active(rs))
+ gfs2_rs_deltree(rs);
+
/* Unlock rgrp if required */
if (!rg_locked)
gfs2_glock_dq_uninit(&rs->rs_rgd_gh);