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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client

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Pull Ceph fixes from Sage Weil:
 "There are a couple of fixes from Yan for bad pointer dereferences in
  the messenger code and when fiddling with page->private after page
  migration, a fix from Alex for a use-after-free in the osd client
  code, and a couple fixes for the message refcounting and shutdown
  ordering."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
  libceph: flush msgr queue during mon_client shutdown
  rbd: Clear ceph_msg->bio_iter for retransmitted message
  libceph: use con get/put ops from osd_client
  libceph: osd_client: don't drop reply reference too early
  ceph: check PG_Private flag before accessing page->private
This commit is contained in:
Linus Torvalds 2012-06-22 17:47:08 -07:00
commit 002b758b6d
5 changed files with 30 additions and 22 deletions
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21
fs/ceph/addr.c
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@ -54,7 +54,12 @@
(CONGESTION_ON_THRESH(congestion_kb) - \
(CONGESTION_ON_THRESH(congestion_kb) >> 2))
static inline struct ceph_snap_context *page_snap_context(struct page *page)
{
if (PagePrivate(page))
return (void *)page->private;
return NULL;
}
/*
* Dirty a page. Optimistically adjust accounting, on the assumption
@ -142,10 +147,9 @@ static void ceph_invalidatepage(struct page *page, unsigned long offset)
{
struct inode *inode;
struct ceph_inode_info *ci;
struct ceph_snap_context *snapc = (void *)page->private;
struct ceph_snap_context *snapc = page_snap_context(page);
BUG_ON(!PageLocked(page));
BUG_ON(!page->private);
BUG_ON(!PagePrivate(page));
BUG_ON(!page->mapping);
@ -182,7 +186,6 @@ static int ceph_releasepage(struct page *page, gfp_t g)
struct inode *inode = page->mapping ? page->mapping->host : NULL;
dout("%p releasepage %p idx %lu\n", inode, page, page->index);
WARN_ON(PageDirty(page));
WARN_ON(page->private);
WARN_ON(PagePrivate(page));
return 0;
}
@ -443,7 +446,7 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
osdc = &fsc->client->osdc;
/* verify this is a writeable snap context */
snapc = (void *)page->private;
snapc = page_snap_context(page);
if (snapc == NULL) {
dout("writepage %p page %p not dirty?\n", inode, page);
goto out;
@ -451,7 +454,7 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
oldest = get_oldest_context(inode, &snap_size);
if (snapc->seq > oldest->seq) {
dout("writepage %p page %p snapc %p not writeable - noop\n",
inode, page, (void *)page->private);
inode, page, snapc);
/* we should only noop if called by kswapd */
WARN_ON((current->flags & PF_MEMALLOC) == 0);
ceph_put_snap_context(oldest);
@ -591,7 +594,7 @@ static void writepages_finish(struct ceph_osd_request *req,
clear_bdi_congested(&fsc->backing_dev_info,
BLK_RW_ASYNC);
ceph_put_snap_context((void *)page->private);
ceph_put_snap_context(page_snap_context(page));
page->private = 0;
ClearPagePrivate(page);
dout("unlocking %d %p\n", i, page);
@ -795,7 +798,7 @@ get_more_pages:
}
/* only if matching snap context */
pgsnapc = (void *)page->private;
pgsnapc = page_snap_context(page);
if (pgsnapc->seq > snapc->seq) {
dout("page snapc %p %lld > oldest %p %lld\n",
pgsnapc, pgsnapc->seq, snapc, snapc->seq);
@ -984,7 +987,7 @@ retry_locked:
BUG_ON(!ci->i_snap_realm);
down_read(&mdsc->snap_rwsem);
BUG_ON(!ci->i_snap_realm->cached_context);
snapc = (void *)page->private;
snapc = page_snap_context(page);
if (snapc && snapc != ci->i_head_snapc) {
/*
* this page is already dirty in another (older) snap