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gfs2: Defer deleting inodes under memory pressure 

When under memory pressure and an inode's link count has dropped to
zero, defer deleting the inode to the delete workqueue.  This avoids
calling into DLM under memory pressure, which can deadlock.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2017-08-01 11:49:42 -05:00 committed by Bob Peterson
parent 71c1b21368
commit 6a1c8f6dcf
1 changed files with 21 additions and 0 deletions
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21
fs/gfs2/super.c
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@ -1318,6 +1318,23 @@ static int gfs2_drop_inode(struct inode *inode)
if (test_bit(GLF_DEMOTE, &gl->gl_flags))
clear_nlink(inode);
}
/*
* When under memory pressure when an inode's link count has dropped to
* zero, defer deleting the inode to the delete workqueue. This avoids
* calling into DLM under memory pressure, which can deadlock.
*/
if (!inode->i_nlink &&
unlikely(current->flags & PF_MEMALLOC) &&
gfs2_holder_initialized(&ip->i_iopen_gh)) {
struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
gfs2_glock_hold(gl);
if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
gfs2_glock_queue_put(gl);
return false;
}
return generic_drop_inode(inode);
}
@ -1561,6 +1578,10 @@ static void gfs2_evict_inode(struct inode *inode)
goto alloc_failed;
}
/* Deletes should never happen under memory pressure anymore. */
if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
goto out;
/* Must not read inode block until block type has been verified */
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
if (unlikely(error)) {