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Fix crash when using ZFS on Ceph rbd 

When using __get_free_pages to get high order memory, only the first page's
_count will set to 1, other's will be 0. When an internal page get passed into
rbd, it will eventully go into tcp_sendpage. There, it will be called with
get_page and put_page, and get freed erroneously when _count jump back to 0.

The solution to this problem is to use compound page. All pages in a
high order compound page share a single _count. So get_page and put_page in
tcp_sendpage will not cause _count jump to 0.

Signed-off-by: Chunwei Chen <tuxoko@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #251
This commit is contained in:
Chunwei Chen 2014-04-22 16:45:36 +08:00 committed by Brian Behlendorf
parent d6e6e4a98e
commit ae16ed992b
1 changed files with 2 additions and 1 deletions
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3
module/spl/spl-kmem.c
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@ -864,7 +864,8 @@ kv_alloc(spl_kmem_cache_t *skc, int size, int flags)
ASSERT(ISP2(size));
if (skc->skc_flags & KMC_KMEM)
ptr = (void *)__get_free_pages(flags, get_order(size));
ptr = (void *)__get_free_pages(flags | __GFP_COMP,
get_order(size));
else
ptr = __vmalloc(size, flags | __GFP_HIGHMEM, PAGE_KERNEL);