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f2fs: fix a mount fail for wrong next_scan_nid 

-write_checkpoint
   -do_checkpoint
      -next_free_nid    <--- something wrong with next free nid

-f2fs_fill_super
   -build_node_manager
      -build_free_nids
          -get_current_nat_page
             -__get_meta_page   <--- attempt to access beyond end of device

Signed-off-by: Yunlei He <heyunlei@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Yunlei He 2017-04-26 15:56:52 +08:00 committed by Jaegeuk Kim
parent baaabbb72b
commit e9cdd30770
1 changed files with 3 additions and 0 deletions
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3
fs/f2fs/node.c
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@ -1955,6 +1955,9 @@ static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount)
int i = 0;
nid_t nid = nm_i->next_scan_nid;
if (unlikely(nid >= nm_i->max_nid))
nid = 0;
/* Enough entries */
if (nm_i->nid_cnt[FREE_NID_LIST] >= NAT_ENTRY_PER_BLOCK)
return;