f2fs: should use inode when updating file offset

In indirect or double indirect node blocks, we should use parent inode
information to check the offset.

This fixes the below complaint with a reproducer.

$ mount -t f2fs -o discard,compress_extension=* /dev/$DEV $TESTDIR
$ f2fs_io write 1 3944 4 zero buffered $TESTDIR/a
$ umount /dev/$DEV
$ fsck.f2fs /dev/$DEV
Info: MKFS version
  "Linux version 6.5.0-rc1-custom (root@file) (gcc (Ubuntu 11.2.0-7ubuntu2) 11.2.0, GNU ld (GNU Binutils for Ubuntu) 2.37) #19 SMP PREEMPT_DYNAMIC Mon Jul 10 19:18:40 UTC 2023"
Info: FSCK version
  from "Linux version 6.5.0-rc1-custom (root@file) (gcc (Ubuntu 11.2.0-7ubuntu2) 11.2.0, GNU ld (GNU Binutils for Ubuntu) 2.37) #19 SMP PREEMPT_DYNAMIC Mon Jul 10 19:18:40 UTC 2023"
    to "Linux version 6.5.0-rc1-custom (root@file) (gcc (Ubuntu 11.2.0-7ubuntu2) 11.2.0, GNU ld (GNU Binutils for Ubuntu) 2.37) #19 SMP PREEMPT_DYNAMIC Mon Jul 10 19:18:40 UTC 2023"
Info: superblock features = 3088 :  extra_attr quota casefold compression
Info: superblock encrypt level = 0, salt = 00000000000000000000000000000000
Info: Segments per section = 1
Info: Sections per zone = 1
Info: total FS sectors = 134217728 (65536 MB)
Info: CKPT version = 284f1e2f
Info: Checked valid nat_bits in checkpoint
Info: checkpoint state = c5 :  nat_bits crc compacted_summary unmount
[ASSERT] (fsck_chk_inode_blk:1189)  --> ino: 0x6 has i_blocks: 00000007, but has 6 blocks

[FSCK] Max image size: 378 MB, Free space: 65158 MB
[FSCK] Unreachable nat entries                        [Ok..] [0x0]
[FSCK] SIT valid block bitmap checking                [Ok..]
[FSCK] Hard link checking for regular file            [Ok..] [0x0]
[FSCK] valid_block_count matching with CP             [Fail] [0xf, 0xe]
[FSCK] valid_node_count matching with CP (de lookup)  [Ok..] [0x6]
[FSCK] valid_node_count matching with CP (nat lookup) [Ok..] [0x6]
[FSCK] valid_inode_count matched with CP              [Ok..] [0x4]
[FSCK] free segment_count matched with CP             [Ok..] [0x7f3f]
[FSCK] next block offset is free                      [Ok..]
[FSCK] fixing SIT types
[FSCK] other corrupted bugs                           [Fail]
Do you want to fix this partition? [Y/N]

Signed-off-by: Jaegeuk Kim <[email protected]>

fsck/fsck.c

@@ -1430,7 +1430,7 @@ int fsck_chk_idnode_blk(struct f2fs_sb_info *sbi, struct f2fs_inode *inode,
 				FIX_MSG("Set indirect node 0x%x -> 0", i);
 			}
 skip:
-			child->pgofs += ADDRS_PER_BLOCK(&node_blk->i);
+			child->pgofs += ADDRS_PER_BLOCK(inode);
 		}
 	}
 
@@ -1472,8 +1472,7 @@ int fsck_chk_didnode_blk(struct f2fs_sb_info *sbi, struct f2fs_inode *inode,
 				FIX_MSG("Set double indirect node 0x%x -> 0", i);
 			}
 skip:
-			child->pgofs += ADDRS_PER_BLOCK(&node_blk->i) *
-							NIDS_PER_BLOCK;
+			child->pgofs += ADDRS_PER_BLOCK(inode) * NIDS_PER_BLOCK;
 		}
 	}