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authorDavid Howells <dhowells@redhat.com>2018-01-02 13:02:19 +0300
committerDavid Howells <dhowells@redhat.com>2018-01-02 13:02:19 +0300
commit98801506552593c9b8ac11021b0cdad12cab4f6b (patch)
tree4471ea8580a3670ad16fce23e77d1b4ab89957fc
parent30a7acd573899fd8b8ac39236eff6468b195ac7d (diff)
downloadlinux-98801506552593c9b8ac11021b0cdad12cab4f6b.tar.xz
fscache: Fix the default for fscache_maybe_release_page()
Fix the default for fscache_maybe_release_page() for when the cookie isn't valid or the page isn't cached. It mustn't return false as that indicates the page cannot yet be freed. The problem with the default is that if, say, there's no cache, but a network filesystem's pages are using up almost all the available memory, a system can OOM because the filesystem ->releasepage() op will not allow them to be released as fscache_maybe_release_page() incorrectly prevents it. This can be tested by writing a sequence of 512MiB files to an AFS mount. It does not affect NFS or CIFS because both of those wrap the call in a check of PG_fscache and it shouldn't bother Ceph as that only has PG_private set whilst writeback is in progress. This might be an issue for 9P, however. Note that the pages aren't entirely stuck. Removing a file or unmounting will clear things because that uses ->invalidatepage() instead. Fixes: 201a15428bd5 ("FS-Cache: Handle pages pending storage that get evicted under OOM conditions") Reported-by: Marc Dionne <marc.dionne@auristor.com> Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Tested-by: Marc Dionne <marc.dionne@auristor.com> cc: stable@vger.kernel.org # 2.6.32+
-rw-r--r--include/linux/fscache.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index f4ff47d4a893..fe0c349684fa 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -755,7 +755,7 @@ bool fscache_maybe_release_page(struct fscache_cookie *cookie,
{
if (fscache_cookie_valid(cookie) && PageFsCache(page))
return __fscache_maybe_release_page(cookie, page, gfp);
- return false;
+ return true;
}
/**