linux.git/fs/f2fs/checkpoint.c, branch v5.2

f2fs: fix to avoid potential race on sbi->unusable_block_count access/update

2019-05-09T04:23:13+00:00

Use sbi.stat_lock to protect sbi->unusable_block_count accesss/udpate, in
order to avoid potential race on it.

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: introduce DATA_GENERIC_ENHANCE

2019-05-09T04:23:13+00:00

Previously, f2fs_is_valid_blkaddr(, blkaddr, DATA_GENERIC) will check
whether @blkaddr locates in main area or not.

That check is weak, since the block address in range of main area can
point to the address which is not valid in segment info table, and we
can not detect such condition, we may suffer worse corruption as system
continues running.

So this patch introduce DATA_GENERIC_ENHANCE to enhance the sanity check
which trigger SIT bitmap check rather than only range check.

This patch did below changes as wel:
- set SBI_NEED_FSCK in f2fs_is_valid_blkaddr().
- get rid of is_valid_data_blkaddr() to avoid panic if blkaddr is invalid.
- introduce verify_fio_blkaddr() to wrap fio {new,old}_blkaddr validation check.
- spread blkaddr check in:
 * f2fs_get_node_info()
 * __read_out_blkaddrs()
 * f2fs_submit_page_read()
 * ra_data_block()
 * do_recover_data()

This patch can fix bug reported from bugzilla below:

https://bugzilla.kernel.org/show_bug.cgi?id=203215
https://bugzilla.kernel.org/show_bug.cgi?id=203223
https://bugzilla.kernel.org/show_bug.cgi?id=203231
https://bugzilla.kernel.org/show_bug.cgi?id=203235
https://bugzilla.kernel.org/show_bug.cgi?id=203241

= Update by Jaegeuk Kim =

DATA_GENERIC_ENHANCE enhanced to validate block addresses on read/write paths.
But, xfstest/generic/446 compalins some generated kernel messages saying invalid
bitmap was detected when reading a block. The reaons is, when we get the
block addresses from extent_cache, there is no lock to synchronize it from
truncating the blocks in parallel.

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: fix to be aware of readonly device in write_checkpoint()

2019-05-09T04:23:12+00:00

As Park Ju Hyung reported:

Probably unrelated but a similar issue:
Warning appears upon unmounting a corrupted R/O f2fs loop image.

Should be a trivial issue to fix as well :)

[ 2373.758424] ------------[ cut here ]------------
[ 2373.758428] generic_make_request: Trying to write to read-only
block-device loop1 (partno 0)
[ 2373.758455] WARNING: CPU: 1 PID: 13950 at block/blk-core.c:2174
generic_make_request_checks+0x590/0x630
[ 2373.758556] CPU: 1 PID: 13950 Comm: umount Tainted: G           O
   4.19.35-zen+ #1
[ 2373.758558] Hardware name: System manufacturer System Product
Name/ROG MAXIMUS X HERO (WI-FI AC), BIOS 1704 09/14/2018
[ 2373.758564] RIP: 0010:generic_make_request_checks+0x590/0x630
[ 2373.758567] Code: 5c 03 00 00 48 8d 74 24 08 48 89 df c6 05 b5 cd
36 01 01 e8 c2 90 01 00 48 89 c6 44 89 ea 48 c7 c7 98 64 59 82 e8 d5
9b a7 ff <0f> 0b 48 8b 7b 08 e9 f2 fa ff ff 41 8b 86 98 02 00 00 49 8b
16 89
[ 2373.758570] RSP: 0018:ffff8882bdb43950 EFLAGS: 00010282
[ 2373.758573] RAX: 0000000000000050 RBX: ffff8887244c6700 RCX: 0000000000000006
[ 2373.758575] RDX: 0000000000000007 RSI: 0000000000000086 RDI: ffff88884ec56340
[ 2373.758577] RBP: ffff888849c426c0 R08: 0000000000000004 R09: 00000000000003ba
[ 2373.758579] R10: 0000000000000001 R11: 0000000000000029 R12: 0000000000001000
[ 2373.758581] R13: 0000000000000000 R14: ffff888844a2e800 R15: ffff8882bdb43ac0
[ 2373.758584] FS:  00007fc0d114f8c0(0000) GS:ffff88884ec40000(0000)
knlGS:0000000000000000
[ 2373.758586] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2373.758588] CR2: 00007fc0d1ad12c0 CR3: 00000002bdb82003 CR4: 00000000003606e0
[ 2373.758590] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2373.758592] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 2373.758593] Call Trace:
[ 2373.758602]  ? generic_make_request+0x46/0x3d0
[ 2373.758608]  ? wait_woken+0x80/0x80
[ 2373.758612]  ? mempool_alloc+0xb7/0x1a0
[ 2373.758618]  ? submit_bio+0x30/0x110
[ 2373.758622]  ? bvec_alloc+0x7c/0xd0
[ 2373.758628]  ? __submit_merged_bio+0x68/0x390
[ 2373.758633]  ? f2fs_submit_page_write+0x1bb/0x7f0
[ 2373.758638]  ? f2fs_do_write_meta_page+0x7f/0x160
[ 2373.758642]  ? __f2fs_write_meta_page+0x70/0x140
[ 2373.758647]  ? f2fs_sync_meta_pages+0x140/0x250
[ 2373.758653]  ? f2fs_write_checkpoint+0x5c5/0x17b0
[ 2373.758657]  ? f2fs_sync_fs+0x9c/0x110
[ 2373.758664]  ? sync_filesystem+0x66/0x80
[ 2373.758667]  ? generic_shutdown_super+0x1d/0x100
[ 2373.758670]  ? kill_block_super+0x1c/0x40
[ 2373.758674]  ? kill_f2fs_super+0x64/0xb0
[ 2373.758678]  ? deactivate_locked_super+0x2d/0xb0
[ 2373.758682]  ? cleanup_mnt+0x65/0xa0
[ 2373.758688]  ? task_work_run+0x7f/0xa0
[ 2373.758693]  ? exit_to_usermode_loop+0x9c/0xa0
[ 2373.758698]  ? do_syscall_64+0xc7/0xf0
[ 2373.758703]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 2373.758706] ---[ end trace 5d3639907c56271b ]---
[ 2373.758780] print_req_error: I/O error, dev loop1, sector 143048
[ 2373.758800] print_req_error: I/O error, dev loop1, sector 152200
[ 2373.758808] print_req_error: I/O error, dev loop1, sector 8192
[ 2373.758819] print_req_error: I/O error, dev loop1, sector 12272

This patch adds to detect readonly device in write_checkpoint() to avoid
trigger write IOs on it.

Reported-by: Park Ju Hyung 
Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: fix to skip recovery on readonly device

2019-05-09T04:23:12+00:00

As Park Ju Hyung reported in mailing list:

https://sourceforge.net/p/linux-f2fs/mailman/message/36639787/

generic_make_request: Trying to write to read-only block-device loop0 (partno 0)
WARNING: CPU: 0 PID: 23437 at block/blk-core.c:2174 generic_make_request_checks+0x594/0x630

 generic_make_request+0x46/0x3d0
 submit_bio+0x30/0x110
 __submit_merged_bio+0x68/0x390
 f2fs_submit_page_write+0x1bb/0x7f0
 f2fs_do_write_meta_page+0x7f/0x160
 __f2fs_write_meta_page+0x70/0x140
 f2fs_sync_meta_pages+0x140/0x250
 f2fs_write_checkpoint+0x5c5/0x17b0
 f2fs_sync_fs+0x9c/0x110
 sync_filesystem+0x66/0x80
 f2fs_recover_fsync_data+0x790/0xa30
 f2fs_fill_super+0xe4e/0x1980
 mount_bdev+0x518/0x610
 mount_fs+0x34/0x13f
 vfs_kern_mount.part.11+0x4f/0x120
 do_mount+0x2d1/0xe40
 __x64_sys_mount+0xbf/0xe0
 do_syscall_64+0x4a/0xf0
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

print_req_error: I/O error, dev loop0, sector 4096

If block device is readonly, we should never trigger write IO from
filesystem layer, but previously, orphan and journal recovery didn't
consider such condition, result in triggering above warning, fix it.

Reported-by: Park Ju Hyung 
Tested-by: Park Ju Hyung 
Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: relocate chksum_offset for large_nat_bitmap feature

2019-05-09T04:23:11+00:00

For large_nat_bitmap feature, there is a design flaw:

Previous:

struct f2fs_checkpoint layout:
+--------------------------+  0x0000
| checkpoint_ver           |
| ......                   |
| checksum_offset          |------+
| ......                   |      |
| sit_nat_version_bitmap[] |<-----|-------+
| ......                   |      |       |
| checksum_value           |<-----+       |
+--------------------------+  0x1000      |
|                          |      nat_bitmap + sit_bitmap
| payload blocks           |              |
|                          |              |
+--------------------------|<-------------+

Obviously, if nat_bitmap size + sit_bitmap size is larger than
MAX_BITMAP_SIZE_IN_CKPT, nat_bitmap or sit_bitmap may overlap
checkpoint checksum's position, once checkpoint() is triggered
from kernel, nat or sit bitmap will be damaged by checksum field.

In order to fix this, let's relocate checksum_value's position
to the head of sit_nat_version_bitmap as below, then nat/sit
bitmap and chksum value update will become safe.

After:

struct f2fs_checkpoint layout:
+--------------------------+  0x0000
| checkpoint_ver           |
| ......                   |
| checksum_offset          |------+
| ......                   |      |
| sit_nat_version_bitmap[] |<-----+
| ......                   |<-------------+
|                          |              |
+--------------------------+  0x1000      |
|                          |      nat_bitmap + sit_bitmap
| payload blocks           |              |
|                          |              |
+--------------------------|<-------------+

Related report and discussion:

https://sourceforge.net/p/linux-f2fs/mailman/message/36642346/

Reported-by: Park Ju Hyung 
Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: allow unfixed f2fs_checkpoint.checksum_offset

2019-05-09T04:23:11+00:00

Previously, f2fs_checkpoint.checksum_offset points fixed position of
f2fs_checkpoint structure:

"#define CP_CHKSUM_OFFSET	4092"

It is unnecessary, and it breaks the consecutiveness of nat and sit
bitmap stored across checkpoint park block and payload blocks.

This patch allows f2fs to handle unfixed .checksum_offset.

In addition, for the case checksum value is stored in the middle of
checkpoint park, calculating checksum value with superposition method
like we did for inode_checksum.

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: fix wrong __is_meta_io() macro

2019-05-09T04:23:07+00:00

This patch changes codes as below:
- don't use is_read_io() as a condition to judge the meta IO.
- use .is_por to replace .is_meta to indicate IO is from recovery explicitly.

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: fix potential recursive call when enabling data_flush

2019-04-05T16:34:14+00:00

As Hagbard Celine reported:

Hi, this is a long standing bug that I've hit before on older kernels,
but I was not able to get the syslog saved because of the nature of
the bug. This time I had booted form a pen-drive, and was able to save
the log to it's efi-partition.
What i did to trigger it was to create a partition and format it f2fs,
then mount it with options:
"rw,relatime,lazytime,background_gc=on,disable_ext_identify,discard,heap,user_xattr,inline_xattr,acl,inline_data,inline_dentry,flush_merge,data_flush,extent_cache,mode=adaptive,active_logs=6,whint_mode=fs-based,alloc_mode=default,fsync_mode=strict".
Then I unpacked a big .tar.xz to the partition (I used a
gentoo-stage3-tarball as I was in process of installing Gentoo).

Same options just without data_flush gives no problems.

Mar 20 20:54:01 usbgentoo kernel: FAT-fs (nvme0n1p4): Volume was not
properly unmounted. Some data may be corrupt. Please run fsck.
Mar 20 21:05:23 usbgentoo kernel: kworker/dying (1588) used greatest
stack depth: 12064 bytes left
Mar 20 21:06:40 usbgentoo kernel: BUG: stack guard page was hit at
00000000a4b0733c (stack is 0000000056016422..0000000096e7463f)
Mar 20 21:06:40 usbgentoo kernel: kernel stack overflow

......

Mar 20 21:06:40 usbgentoo kernel: Call Trace:
Mar 20 21:06:40 usbgentoo kernel:  read_node_page+0x71/0xf0
Mar 20 21:06:40 usbgentoo kernel:  ? xas_load+0x8/0x50
Mar 20 21:06:40 usbgentoo kernel:  __get_node_page+0x73/0x2a0
Mar 20 21:06:40 usbgentoo kernel:  f2fs_get_dnode_of_data+0x34e/0x580
Mar 20 21:06:40 usbgentoo kernel:  f2fs_write_inline_data+0x5e/0x2a0
Mar 20 21:06:40 usbgentoo kernel:  __write_data_page+0x421/0x690
Mar 20 21:06:40 usbgentoo kernel:  f2fs_write_cache_pages+0x1cf/0x460
Mar 20 21:06:40 usbgentoo kernel:  f2fs_write_data_pages+0x2b3/0x2e0
Mar 20 21:06:40 usbgentoo kernel:  ? f2fs_inode_chksum_verify+0x1d/0xc0
Mar 20 21:06:40 usbgentoo kernel:  ? read_node_page+0x71/0xf0
Mar 20 21:06:40 usbgentoo kernel:  do_writepages+0x3c/0xd0
Mar 20 21:06:40 usbgentoo kernel:  __filemap_fdatawrite_range+0x7c/0xb0
Mar 20 21:06:40 usbgentoo kernel:  f2fs_sync_dirty_inodes+0xf2/0x200
Mar 20 21:06:40 usbgentoo kernel:  f2fs_balance_fs_bg+0x2a3/0x2c0
Mar 20 21:06:40 usbgentoo kernel:  ? f2fs_inode_dirtied+0x21/0xc0
Mar 20 21:06:40 usbgentoo kernel:  f2fs_balance_fs+0xd6/0x2b0
Mar 20 21:06:40 usbgentoo kernel:  __write_data_page+0x4fb/0x690

......

Mar 20 21:06:40 usbgentoo kernel:  __writeback_single_inode+0x2a1/0x340
Mar 20 21:06:40 usbgentoo kernel:  ? soft_cursor+0x1b4/0x220
Mar 20 21:06:40 usbgentoo kernel:  writeback_sb_inodes+0x1d5/0x3e0
Mar 20 21:06:40 usbgentoo kernel:  __writeback_inodes_wb+0x58/0xa0
Mar 20 21:06:40 usbgentoo kernel:  wb_writeback+0x250/0x2e0
Mar 20 21:06:40 usbgentoo kernel:  ? 0xffffffff8c000000
Mar 20 21:06:40 usbgentoo kernel:  ? cpumask_next+0x16/0x20
Mar 20 21:06:40 usbgentoo kernel:  wb_workfn+0x2f6/0x3b0
Mar 20 21:06:40 usbgentoo kernel:  ? __switch_to_asm+0x40/0x70
Mar 20 21:06:40 usbgentoo kernel:  process_one_work+0x1f5/0x3f0
Mar 20 21:06:40 usbgentoo kernel:  worker_thread+0x28/0x3c0
Mar 20 21:06:40 usbgentoo kernel:  ? rescuer_thread+0x330/0x330
Mar 20 21:06:40 usbgentoo kernel:  kthread+0x10e/0x130
Mar 20 21:06:40 usbgentoo kernel:  ? kthread_create_on_node+0x60/0x60
Mar 20 21:06:40 usbgentoo kernel:  ret_from_fork+0x35/0x40

The root cause is that we run into an infinite recursive calling in
between f2fs_balance_fs_bg and writepage() as described below:

- f2fs_write_data_pages		--- A
 - __write_data_page
  - f2fs_balance_fs
   - f2fs_balance_fs_bg		--- B
    - f2fs_sync_dirty_inodes
     - filemap_fdatawrite
      - f2fs_write_data_pages	--- A
...
          - f2fs_balance_fs_bg	--- B
...

In order to fix this issue, let's detect such condition in __write_data_page()
and just skip calling f2fs_balance_fs() recursively.

Reported-by: Hagbard Celine 
Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: fix to add refcount once page is tagged PG_private

2019-03-13T01:59:19+00:00

As Gao Xiang reported in bugzilla:

https://bugzilla.kernel.org/show_bug.cgi?id=202749

f2fs may skip pageout() due to incorrect page reference count.

The problem here is that MM defined the rule [1] very clearly that
once page was set with PG_private flag, we should increment the
refcount in that page, also main flows like pageout(), migrate_page()
will assume there is one additional page reference count if
page_has_private() returns true.

But currently, f2fs won't add/del refcount when changing PG_private
flag. Anyway, f2fs should follow MM's rule to make MM's related flows
running as expected.

[1] https://lore.kernel.org/lkml/2b19b3c4-2bc4-15fa-15cc-27a13e5c7af1@aol.com/

Reported-by: Gao Xiang 
Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: don't clear CP_QUOTA_NEED_FSCK_FLAG

2019-03-06T03:58:06+00:00

If we met this once, let fsck.f2fs clear this only.
Note that, this addresses all the subtle fault injection test.

Reviewed-by: Chao Yu 
Signed-off-by: Jaegeuk Kim