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authorJaegeuk Kim <jaegeuk@kernel.org>2015-08-16 23:04:50 +0300
committerJaegeuk Kim <jaegeuk@kernel.org>2015-08-20 19:00:14 +0300
commit24928634f81b1592e83b37dcd89ed45c28f12feb (patch)
tree41ae5bc8bbb6b21f79bed92a59b5bd8cec99242d /fs/f2fs
parenta21c20f0c812925085204fced932ac95f2a76bf0 (diff)
downloadlinux-24928634f81b1592e83b37dcd89ed45c28f12feb.tar.xz
f2fs: check the node block address of newly allocated nid
This patch adds a routine which checks the block address of newly allocated nid. If an nid has already allocated by other thread due to subtle data races, it will result in filesystem corruption. So, it needs to check whether its block address was already allocated or not in prior to nid allocation as the last chance. Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
-rw-r--r--fs/f2fs/node.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 3cc32b8f8204..6bef5a2788b4 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1573,6 +1573,8 @@ retry:
/* We should not use stale free nids created by build_free_nids */
if (nm_i->fcnt && !on_build_free_nids(nm_i)) {
+ struct node_info ni;
+
f2fs_bug_on(sbi, list_empty(&nm_i->free_nid_list));
list_for_each_entry(i, &nm_i->free_nid_list, list)
if (i->state == NID_NEW)
@@ -1583,6 +1585,13 @@ retry:
i->state = NID_ALLOC;
nm_i->fcnt--;
spin_unlock(&nm_i->free_nid_list_lock);
+
+ /* check nid is allocated already */
+ get_node_info(sbi, *nid, &ni);
+ if (ni.blk_addr != NULL_ADDR) {
+ alloc_nid_done(sbi, *nid);
+ goto retry;
+ }
return true;
}
spin_unlock(&nm_i->free_nid_list_lock);