diff options
authorSteven Whitehouse <swhiteho@redhat.com>2014-06-23 14:50:20 +0100
committerSteven Whitehouse <swhiteho@redhat.com>2014-07-18 11:13:12 +0100
commitfe0bbd2986996b9efe3a78bf5a591b0496c7afea (patch)
parent94a09a3999ee978e097b5aad74034ed43bae56db (diff)
GFS2: Use GFP_NOFS when allocating glocks
Normally GFP_KERNEL is ok here, but there is now a rarely used code path relating to deallocation of unlinked inodes (in certain corner cases) which if hit at times of memory shortage can cause recursion while trying to free memory. One solution would be to try and move the gfs2_glock_get() call so that it is no longer called while another glock is held, but that doesn't look at all easy, so GFP_NOFS is the best solution for the time being. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index c1e5b126d2ca..b703dcc91588 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -731,14 +731,14 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
cachep = gfs2_glock_aspace_cachep;
cachep = gfs2_glock_cachep;
- gl = kmem_cache_alloc(cachep, GFP_KERNEL);
+ gl = kmem_cache_alloc(cachep, GFP_NOFS);
if (!gl)
return -ENOMEM;
memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb));
if (glops->go_flags & GLOF_LVB) {
- gl->gl_lksb.sb_lvbptr = kzalloc(GFS2_MIN_LVB_SIZE, GFP_KERNEL);
+ gl->gl_lksb.sb_lvbptr = kzalloc(GFS2_MIN_LVB_SIZE, GFP_NOFS);
if (!gl->gl_lksb.sb_lvbptr) {
kmem_cache_free(cachep, gl);
return -ENOMEM;

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