Hi. I am trying to use a new function to reduce the size of an F2FS file
system. After resizing, `fsck.f2fs` gives a lot of errors. Here is a
shell script that creates and resizes a dummy file system:
```
#!/bin/sh
set -e
F=/tmp/img
D=/dev/loop0
M=/root/mnt/temp
dd bs=1M count=256 if=/dev/zero "of=$F"
losetup "$D" "$F"
mkfs.f2fs "$D"
fsck.f2fs "$D"
mount "$D" "$M"
dd bs=1M count=64
if=/mnt/data/external/misc/movie/Idiocracy.2006.WEB-DL.1080p-ylnian.mkv
of="${M}/a.mkv"
umount "$M"
resize.f2fs -s -t 262144 "$D"
fsck.f2fs "$D"
losetup -d "$D"
```
```
+ set -e
+ F=/tmp/img
+ D=/dev/loop0
+ M=/root/mnt/temp
+ dd bs=1M count=256 if=/dev/zero of=/tmp/img
256+0 records in
256+0 records out
268435456 bytes (268 MB, 256 MiB) copied, 0.0867954 s, 3.1 GB/s
+ losetup /dev/loop0 /tmp/img
+ mkfs.f2fs /dev/loop0
F2FS-tools: mkfs.f2fs Ver: 1.14.0 (2020-08-24)
Info: Disable heap-based policy
Info: Debug level = 0
Info: Trim is enabled
Info: Segments per section = 1
Info: Sections per zone = 1
Info: sector size = 512
Info: total sectors = 524288 (256 MB)
Info: zone aligned segment0 blkaddr: 512
Info: format version with
"Linux version 5.11.7-arch1-1 (linux@archlinux) (gcc (GCC) 10.2.0,
GNU ld (GNU Binutils) 2.36.1) #1 SMP PREEMPT Wed, 17 Mar 2021 16:59:58
+0000"
Info: [/dev/loop0] Discarding device
Info: This device doesn't support BLKSECDISCARD
Info: Discarded 256 MB
Info: Overprovision ratio = 15.000%
Info: Overprovision segments = 35 (GC reserved = 21)
Info: format successful
+ fsck.f2fs /dev/loop0
Info: Segments per section = 1
Info: Sections per zone = 1
Info: sector size = 512
Info: total sectors = 524288 (256 MB)
Info: MKFS version
"Linux version 5.11.7-arch1-1 (linux@archlinux) (gcc (GCC) 10.2.0,
GNU ld (GNU Binutils) 2.36.1) #1 SMP PREEMPT Wed, 17 Mar 2021 16:59:58
+0000"
Info: FSCK version
from "Linux version 5.11.7-arch1-1 (linux@archlinux) (gcc (GCC)
10.2.0, GNU ld (GNU Binutils) 2.36.1) #1 SMP PREEMPT Wed, 17 Mar 2021
16:59:58 +0000"
to "Linux version 5.11.7-arch1-1 (linux@archlinux) (gcc (GCC)
10.2.0, GNU ld (GNU Binutils) 2.36.1) #1 SMP PREEMPT Wed, 17 Mar 2021
16:59:58 +0000"
Info: superblock features = 0 :
Info: superblock encrypt level = 0, salt = 00000000000000000000000000000000
Info: total FS sectors = 524288 (256 MB)
Info: CKPT version = 8aa0d85
Info: Checked valid nat_bits in checkpoint
Info: checkpoint state = 185 : trimmed nat_bits compacted_summary unmount
[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 [Ok..] [0x2]
[FSCK] valid_node_count matching with CP (de lookup) [Ok..] [0x1]
[FSCK] valid_node_count matching with CP (nat lookup) [Ok..] [0x1]
[FSCK] valid_inode_count matched with CP [Ok..] [0x1]
[FSCK] free segment_count matched with CP [Ok..] [0x72]
[FSCK] next block offset is free [Ok..]
[FSCK] fixing SIT types
[FSCK] other corrupted bugs [Ok..]
Done: 0.068899 secs
+ mount /dev/loop0 /root/mnt/temp
+ dd bs=1M count=64
if=/mnt/data/external/misc/movie/Idiocracy.2006.WEB-DL.1080p-ylnian.mkv
of=/root/mnt/temp/a.mkv
64+0 records in
64+0 records out
67108864 bytes (67 MB, 64 MiB) copied, 0.0286261 s, 2.3 GB/s
+ umount /root/mnt/temp
+ resize.f2fs -s -t 262144 /dev/loop0
Info: Segments per section = 1
Info: Sections per zone = 1
Info: sector size = 512
Info: total sectors = 524288 (256 MB)
Info: MKFS version
"Linux version 5.11.7-arch1-1 (linux@archlinux) (gcc (GCC) 10.2.0,
GNU ld (GNU Binutils) 2.36.1) #1 SMP PREEMPT Wed, 17 Mar 2021 16:59:58
+0000"
Info: FSCK version
from "Linux version 5.11.7-arch1-1 (linux@archlinux) (gcc (GCC)
10.2.0, GNU ld (GNU Binutils) 2.36.1) #1 SMP PREEMPT Wed, 17 Mar 2021
16:59:58 +0000"
to "Linux version 5.11.7-arch1-1 (linux@archlinux) (gcc (GCC)
10.2.0, GNU ld (GNU Binutils) 2.36.1) #1 SMP PREEMPT Wed, 17 Mar 2021
16:59:58 +0000"
Info: superblock features = 0 :
Info: superblock encrypt level = 0, salt = 00000000000000000000000000000000
Info: total FS sectors = 524288 (256 MB)
Info: CKPT version = 8aa0d89
Info: Duplicate valid checkpoint to mirror position 512 -> 1024
Info: Write valid nat_bits in checkpoint
[FIX] (move_one_curseg_info:2798) --> Move curseg[0] 3 -> 37 after 8000
[FIX] (move_one_curseg_info:2798) --> Move curseg[1] 3b -> 36 after 8000
[FIX] (move_one_curseg_info:2798) --> Move curseg[2] 24 -> 35 after 8000
[FIX] (move_one_curseg_info:2798) --> Move curseg[3] 0 -> 34 after 8000
[FIX] (move_one_curseg_info:2798) --> Move curseg[4] 1 -> 33 after 8000
[FIX] (move_one_curseg_info:2798) --> Move curseg[5] 2 -> 32 after 8000
Info: Write valid nat_bits in checkpoint
Try to do defragement: Done
[update_superblock: 695] Info: Done to update superblock
Info: Write valid nat_bits in checkpoint
[rebuild_checkpoint: 585] Info: Done to rebuild checkpoint blocks
Done: 0.065604 secs
+ fsck.f2fs /dev/loop0
Info: Segments per section = 1
Info: Sections per zone = 1
Info: sector size = 512
Info: total sectors = 524288 (256 MB)
Info: MKFS version
"Linux version 5.11.7-arch1-1 (linux@archlinux) (gcc (GCC) 10.2.0,
GNU ld (GNU Binutils) 2.36.1) #1 SMP PREEMPT Wed, 17 Mar 2021 16:59:58
+0000"
Info: FSCK version
from "Linux version 5.11.7-arch1-1 (linux@archlinux) (gcc (GCC)
10.2.0, GNU ld (GNU Binutils) 2.36.1) #1 SMP PREEMPT Wed, 17 Mar 2021
16:59:58 +0000"
to "Linux version 5.11.7-arch1-1 (linux@archlinux) (gcc (GCC)
10.2.0, GNU ld (GNU Binutils) 2.36.1) #1 SMP PREEMPT Wed, 17 Mar 2021
16:59:58 +0000"
Info: superblock features = 0 :
Info: superblock encrypt level = 0, salt = 00000000000000000000000000000000
Info: total FS sectors = 262144 (128 MB)
Invalid CP CRC offset: 0
Info: CKPT version = 8aa0d8a
Info: Checked valid nat_bits in checkpoint
Info: checkpoint state = 181 : trimmed nat_bits unmount
[ASSERT] (fsck_chk_curseg_info:2958) --> Incorrect curseg [1]: segno
[0x36] type(SIT) [0]
[ASSERT] (fsck_chk_curseg_info:2958) --> Incorrect curseg [2]: segno
[0x35] type(SIT) [0]
[ASSERT] (fsck_chk_curseg_info:2958) --> Incorrect curseg [3]: segno
[0x34] type(SIT) [0]
[ASSERT] (fsck_chk_curseg_info:2958) --> Incorrect curseg [4]: segno
[0x33] type(SIT) [0]
[ASSERT] (fsck_chk_curseg_info:2958) --> Incorrect curseg [5]: segno
[0x32] type(SIT) [0]
[ASSERT] (sanity_check_nid: 480) --> SIT bitmap is 0x0. blk_addr[0x1002]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x1601]
[ASSERT] (sanity_check_nid: 480) --> SIT bitmap is 0x0. blk_addr[0x1211]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a00]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a01]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a02]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a03]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a04]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a05]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a06]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a07]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a08]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a09]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a0a]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a0b]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a0c]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a0d]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a0e]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a0f]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a10]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a11]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a12]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a13]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a14]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a15]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a16]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a17]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a18]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a19]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a1a]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a1b]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a1c]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a1d]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a1e]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a1f]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a20]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a21]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a22]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a23]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a24]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a25]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a26]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a27]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a28]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a29]
[ASSERT] (fsck_chk_data_blk:1716) --> SIT bitmap is 0x0. blk_addr[0x4a2a]
{{{skipped}}}
```
The whole output is huge.
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