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authorJan Kara <jack@suse.cz>2010-08-24 14:28:03 +0200
committerTao Ma <tao.ma@oracle.com>2010-09-08 14:25:57 +0800
commit9b4c0ff32ccd87ab52d4c5bd0a0536febce11370 (patch)
treeb9e77d2798eac9051353b29f22e9315d9d9e13b5 /fs/ocfs2/alloc.c
parentb2b6ebf5f740e015b2155343958f067e594323ea (diff)
downloadop-kernel-dev-9b4c0ff32ccd87ab52d4c5bd0a0536febce11370.zip
op-kernel-dev-9b4c0ff32ccd87ab52d4c5bd0a0536febce11370.tar.gz
ocfs2: Fix deadlock when allocating page
We cannot call grab_cache_page() when holding filesystem locks or with a transaction started as grab_cache_page() calls page allocation with GFP_KERNEL flag and thus page reclaim can recurse back into the filesystem causing deadlocks or various assertion failures. We have to use find_or_create_page() instead and pass it GFP_NOFS as we do with other allocations. Acked-by: Mark Fasheh <mfasheh@suse.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Tao Ma <tao.ma@oracle.com>
Diffstat (limited to 'fs/ocfs2/alloc.c')
-rw-r--r--fs/ocfs2/alloc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 215e12c..592fae5 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -6672,7 +6672,7 @@ int ocfs2_grab_pages(struct inode *inode, loff_t start, loff_t end,
last_page_bytes = PAGE_ALIGN(end);
index = start >> PAGE_CACHE_SHIFT;
do {
- pages[numpages] = grab_cache_page(mapping, index);
+ pages[numpages] = find_or_create_page(mapping, index, GFP_NOFS);
if (!pages[numpages]) {
ret = -ENOMEM;
mlog_errno(ret);
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