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authorJaegeuk Kim <jaegeuk@kernel.org>2014-09-13 00:35:58 +0900
committerJaegeuk Kim <jaegeuk@kernel.org>2014-09-16 04:10:47 -0700
commit60979115a69e0e7916a1c1796f902264f1350977 (patch)
tree2ad30495672aee3a7e7822b7cd3eb5c2fdcbd543 /fs/f2fs/recovery.c
parentc6e489305eb5ed029002b037e36800032a994bb4 (diff)
downloadop-kernel-dev-60979115a69e0e7916a1c1796f902264f1350977.zip
op-kernel-dev-60979115a69e0e7916a1c1796f902264f1350977.tar.gz
f2fs: fix double lock for inode page during roll-foward recovery
If the inode is same and its data index are needed to truncate, we can fall into double lock for its inode page via get_dnode_of_data. Error case is like this. 1. write data 1, 2, 3, 4, 5 in inode #4. 2. write data 100, 102, 103, 104, 105 in dnode #6 of inode #4. 3. sync 4. update data 100->106 in dnode #6. 5. fsync inode #4. 6. power-cut -> Then, 1. go back to #3's checkpoint 2. in do_recover_data, get_dnode_of_data() gets inode #4. 3. detect 100->106 in dnode #6. 4. check_index_in_prev_nodes tries to truncate 100 in dnode #6. 5. to trigger truncate_hole, get_dnode_of_data should grab inode #4. 6. detect *kernel hang* This patch should resolve that bug. Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/recovery.c')
-rw-r--r--fs/f2fs/recovery.c28
1 files changed, 21 insertions, 7 deletions
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index 6c5a74a..e587ee1 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -279,16 +279,30 @@ got_it:
ino = ino_of_node(node_page);
f2fs_put_page(node_page, 1);
- /* Deallocate previous index in the node page */
- inode = f2fs_iget(sbi->sb, ino);
- if (IS_ERR(inode))
- return PTR_ERR(inode);
+ if (ino != dn->inode->i_ino) {
+ /* Deallocate previous index in the node page */
+ inode = f2fs_iget(sbi->sb, ino);
+ if (IS_ERR(inode))
+ return PTR_ERR(inode);
+ } else {
+ inode = dn->inode;
+ }
bidx = start_bidx_of_node(offset, F2FS_I(inode)) +
- le16_to_cpu(sum.ofs_in_node);
+ le16_to_cpu(sum.ofs_in_node);
- truncate_hole(inode, bidx, bidx + 1);
- iput(inode);
+ if (ino != dn->inode->i_ino) {
+ truncate_hole(inode, bidx, bidx + 1);
+ iput(inode);
+ } else {
+ struct dnode_of_data tdn;
+ set_new_dnode(&tdn, inode, dn->inode_page, NULL, 0);
+ if (get_dnode_of_data(&tdn, bidx, LOOKUP_NODE))
+ return 0;
+ if (tdn.data_blkaddr != NULL_ADDR)
+ truncate_data_blocks_range(&tdn, 1);
+ f2fs_put_page(tdn.node_page, 1);
+ }
return 0;
}
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