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authorAndreas Gruenbacher <agruenba@redhat.com>2017-08-01 11:45:23 -0500
committerBob Peterson <rpeterso@redhat.com>2017-08-10 10:45:21 -0500
commit71c1b2136835c88c231f7a5e3dc618f7568f84f7 (patch)
tree73a9839b924775b9e91e47a7f5a1288cc583d31c /fs/gfs2/glock.c
parenteebd2e813f7ef688e22cd0b68aea78fb3d1ef19c (diff)
downloadlinux-71c1b2136835c88c231f7a5e3dc618f7568f84f7.tar.bz2
gfs2: gfs2_evict_inode: Put glocks asynchronously
gfs2_evict_inode is called to free inodes under memory pressure. The function calls into DLM when an inode's last cluster-wide reference goes away (remote unlink) and to release the glock and associated DLM lock before finally destroying the inode. However, if DLM is blocked on memory to become available, calling into DLM again will deadlock. Avoid that by decoupling releasing glocks from destroying inodes in that case: with gfs2_glock_queue_put, glocks will be dequeued asynchronously in work queue context, when the associated inodes have likely already been destroyed. With this change, inodes can end up being unlinked, remote-unlink can be triggered, and then the inode can be reallocated before all remote-unlink callbacks are processed. To detect that, revalidate the link count in gfs2_evict_inode to make sure we're not deleting an allocated, referenced inode. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Diffstat (limited to 'fs/gfs2/glock.c')
-rw-r--r--fs/gfs2/glock.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 11d48b964047..5ad757f0ce60 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -171,7 +171,7 @@ void gfs2_glock_free(struct gfs2_glock *gl)
*
*/
-static void gfs2_glock_hold(struct gfs2_glock *gl)
+void gfs2_glock_hold(struct gfs2_glock *gl)
{
GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref));
lockref_get(&gl->gl_lockref);
@@ -264,6 +264,14 @@ static void __gfs2_glock_put(struct gfs2_glock *gl)
sdp->sd_lockstruct.ls_ops->lm_put_lock(gl);
}
+/*
+ * Cause the glock to be put in work queue context.
+ */
+void gfs2_glock_queue_put(struct gfs2_glock *gl)
+{
+ gfs2_glock_queue_work(gl, 0);
+}
+
/**
* gfs2_glock_put() - Decrement reference count on glock
* @gl: The glock to put