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authorJeff Layton <jlayton@redhat.com>2016-10-26 14:26:40 +0300
committerJ. Bruce Fields <bfields@redhat.com>2016-11-01 22:47:43 +0300
commit8f97514b423a0983e4c600099882a9c6613142d2 (patch)
treeb16f551114bf911b4b5bd914ceedb94434226279 /fs/nfsd
parentf46c445b79906a9da55c13e0a6f6b6a006b892fe (diff)
downloadlinux-8f97514b423a0983e4c600099882a9c6613142d2.tar.xz
nfsd: more robust allocation failure handling in nfsd_reply_cache_init
Currently, we try to allocate the cache as a single, large chunk, which can fail if no big chunks of memory are available. We _do_ try to size it according to the amount of memory in the box, but if the server is started well after boot time, then the allocation can fail due to memory fragmentation. Fall back to doing a vzalloc if the kcalloc fails, and switch the shutdown code to do a kvfree to handle freeing correctly. Reported-by: Olaf Hering <olaf@aepfle.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/nfscache.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c
index 54cde9a5864e..d6b97b424ad1 100644
--- a/fs/nfsd/nfscache.c
+++ b/fs/nfsd/nfscache.c
@@ -9,6 +9,7 @@
*/
#include <linux/slab.h>
+#include <linux/vmalloc.h>
#include <linux/sunrpc/addr.h>
#include <linux/highmem.h>
#include <linux/log2.h>
@@ -174,8 +175,12 @@ int nfsd_reply_cache_init(void)
goto out_nomem;
drc_hashtbl = kcalloc(hashsize, sizeof(*drc_hashtbl), GFP_KERNEL);
- if (!drc_hashtbl)
- goto out_nomem;
+ if (!drc_hashtbl) {
+ drc_hashtbl = vzalloc(hashsize * sizeof(*drc_hashtbl));
+ if (!drc_hashtbl)
+ goto out_nomem;
+ }
+
for (i = 0; i < hashsize; i++) {
INIT_LIST_HEAD(&drc_hashtbl[i].lru_head);
spin_lock_init(&drc_hashtbl[i].cache_lock);
@@ -204,7 +209,7 @@ void nfsd_reply_cache_shutdown(void)
}
}
- kfree (drc_hashtbl);
+ kvfree(drc_hashtbl);
drc_hashtbl = NULL;
drc_hashsize = 0;