target/linux/generic/backport-4.14/050-v4.19-f2fs-skip-verifying-block-address-non-regular-inode.patch

   1 From dda9f4b9cac6bdd2a96253b4444d7a6ce5132edb Mon Sep 17 00:00:00 2001
   2 From: Chao Yu <yuchao0@huawei.com>
   3 Date: Sat, 11 Aug 2018 23:42:09 +0800
   4 Subject: f2fs: fix to skip verifying block address for non-regular inode
   5
   6 generic/184 1s ... [failed, exit status 1]- output mismatch
   7     --- tests/generic/184.out   2015-01-11 16:52:27.643681072 +0800
   8      QA output created by 184 - silence is golden
   9     +rm: cannot remove '/mnt/f2fs/null': Bad address
  10     +mknod: '/mnt/f2fs/null': Bad address
  11     +chmod: cannot access '/mnt/f2fs/null': Bad address
  12     +./tests/generic/184: line 36: /mnt/f2fs/null: Bad address
  13     ...
  14
  15 F2FS-fs (zram0): access invalid blkaddr:259
  16 EIP: f2fs_is_valid_blkaddr+0x14b/0x1b0 [f2fs]
  17  f2fs_iget+0x927/0x1010 [f2fs]
  18  f2fs_lookup+0x26e/0x630 [f2fs]
  19  __lookup_slow+0xb3/0x140
  20  lookup_slow+0x31/0x50
  21  walk_component+0x185/0x1f0
  22  path_lookupat+0x51/0x190
  23  filename_lookup+0x7f/0x140
  24  user_path_at_empty+0x36/0x40
  25  vfs_statx+0x61/0xc0
  26  __do_sys_stat64+0x29/0x40
  27  sys_stat64+0x13/0x20
  28  do_fast_syscall_32+0xaa/0x22c
  29  entry_SYSENTER_32+0x53/0x86
  30
  31 In f2fs_iget(), we will check inode's first block address, if it is valid,
  32 we will set FI_FIRST_BLOCK_WRITTEN flag in inode.
  33
  34 But we should only do this for regular inode, otherwise, like special
  35 inode, i_addr[0] is used for storing device info instead of block address,
  36 it will fail checking flow obviously.
  37
  38 So for non-regular inode, let's skip verifying address and setting flag.
  39
  40 Signed-off-by: Chao Yu <yuchao0@huawei.com>
  41 Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
  42 ---
  43  fs/f2fs/inode.c | 14 ++++++++------
  44  1 file changed, 8 insertions(+), 6 deletions(-)
  45
  46 --- a/fs/f2fs/inode.c
  47 +++ b/fs/f2fs/inode.c
  48 @@ -310,13 +310,15 @@ static int do_read_inode(struct inode *i
  49         /* get rdev by using inline_info */
  50         __get_inode_rdev(inode, ri);
  51
  52 -       err = __written_first_block(sbi, ri);
  53 -       if (err < 0) {
  54 -               f2fs_put_page(node_page, 1);
  55 -               return err;
  56 +       if (S_ISREG(inode->i_mode)) {
  57 +               err = __written_first_block(sbi, ri);
  58 +               if (err < 0) {
  59 +                       f2fs_put_page(node_page, 1);
  60 +                       return err;
  61 +               }
  62 +               if (!err)
  63 +                       set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
  64         }
  65 -       if (!err)
  66 -               set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
  67
  68         if (!need_inode_block_update(sbi, inode->i_ino))
  69                 fi->last_disk_size = inode->i_size;