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Author SHA1 Message Date
Kirill A. Shutemov
5e0a760b44 mm, treewide: rename MAX_ORDER to MAX_PAGE_ORDER 
commit 23baf831a32c ("mm, treewide: redefine MAX_ORDER sanely") has
changed the definition of MAX_ORDER to be inclusive.  This has caused
issues with code that was not yet upstream and depended on the previous
definition.

To draw attention to the altered meaning of the define, rename MAX_ORDER
to MAX_PAGE_ORDER.

Link: https://lkml.kernel.org/r/20231228144704.14033-2-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2024-01-08 15:27:15 -08:00
Linus Torvalds
ee0c8a9b34 block-6.7-2023-12-01 
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Merge tag 'block-6.7-2023-12-01' of git://git.kernel.dk/linux

Pull block fixes from Jens Axboe:

 - NVMe pull request via Keith:
     - Invalid namespace identification error handling (Marizio Ewan,
       Keith)
     - Fabrics keep-alive tuning (Mark)

 - Fix for a bad error check regression in bcache (Markus)

 - Fix for a performance regression with O_DIRECT (Ming)

 - Fix for a flush related deadlock (Ming)

 - Make the read-only warn on per-partition (Yu)

* tag 'block-6.7-2023-12-01' of git://git.kernel.dk/linux:
  nvme-core: check for too small lba shift
  blk-mq: don't count completed flush data request as inflight in case of quiesce
  block: Document the role of the two attribute groups
  block: warn once for each partition in bio_check_ro()
  block: move .bd_inode into 1st cacheline of block_device
  nvme: check for valid nvme_identify_ns() before using it
  nvme-core: fix a memory leak in nvme_ns_info_from_identify()
  nvme: fine-tune sending of first keep-alive
  bcache: revert replacing IS_ERR_OR_NULL with IS_ERR
 2023-12-02 06:39:30 +09:00
Linus Torvalds
abd792f330 - Fix DM verity target's FEC support to always initialize IO before it 
frees it.  Also fix alignment of struct dm_verity_fec_io within the
   per-bio-data.
 
 - Fix DM verity target to not FEC failed readahead IO.
 
 - Update DM flakey target to use MAX_ORDER rather than MAX_ORDER - 1.
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Merge tag 'dm-6.7/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:

 - Fix DM verity target's FEC support to always initialize IO before it
   frees it. Also fix alignment of struct dm_verity_fec_io within the
   per-bio-data

 - Fix DM verity target to not FEC failed readahead IO

 - Update DM flakey target to use MAX_ORDER rather than MAX_ORDER - 1

* tag 'dm-6.7/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm-flakey: start allocating with MAX_ORDER
  dm-verity: align struct dm_verity_fec_io properly
  dm verity: don't perform FEC for failed readahead IO
  dm verity: initialize fec io before freeing it
 2023-12-02 06:32:29 +09:00
Linus Torvalds
e6861be452 More bcachefs bugfixes for 6.7 
Bigger/user visible fixes:
 
  - bcache & bcachefs were broken with CFI enabled; patch for closures to
    fix type punning
 
  - mark erasure coding as extra-experimental; there are incompatible
    disk space accounting changes coming for erasure coding, and I'm
    still seeing checksum errors in some tests
 
  - several fixes for durability-related issues (durability is a device
    specific setting where we can tell bcachefs that data on a given
    device should be counted as replicated x times )
 
  - a fix for a rare livelock when a btree node merge then updates a
    parent node that is almost full
 
  - fix a race in the device removal path, where dropping a pointer in a
    btree node to a device would be clobbered by an in flight btree write
    updating the btree node key on completion
 
  - fix one SRCU lock hold time warning in the btree gc code - ther's
    still a bunch more of these to fix
 
  - fix a rare race where we'd start copygc before initializing the "are
    we rw" percpu refcount; copygc would think we were already ro and die
    immediately
 
 https://evilpiepirate.org/~testdashboard/ci?branch=bcachefs-for-upstream
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Merge tag 'bcachefs-2023-11-29' of https://evilpiepirate.org/git/bcachefs

Pull more bcachefs bugfixes from Kent Overstreet:

 - bcache & bcachefs were broken with CFI enabled; patch for closures to
   fix type punning

 - mark erasure coding as extra-experimental; there are incompatible
   disk space accounting changes coming for erasure coding, and I'm
   still seeing checksum errors in some tests

 - several fixes for durability-related issues (durability is a device
   specific setting where we can tell bcachefs that data on a given
   device should be counted as replicated x times)

 - a fix for a rare livelock when a btree node merge then updates a
   parent node that is almost full

 - fix a race in the device removal path, where dropping a pointer in a
   btree node to a device would be clobbered by an in flight btree write
   updating the btree node key on completion

 - fix one SRCU lock hold time warning in the btree gc code - ther's
   still a bunch more of these to fix

 - fix a rare race where we'd start copygc before initializing the "are
   we rw" percpu refcount; copygc would think we were already ro and die
   immediately

* tag 'bcachefs-2023-11-29' of https://evilpiepirate.org/git/bcachefs: (23 commits)
  bcachefs: Extra kthread_should_stop() calls for copygc
  bcachefs: Convert gc_alloc_start() to for_each_btree_key2()
  bcachefs: Fix race between btree writes and metadata drop
  bcachefs: move journal seq assertion
  bcachefs: -EROFS doesn't count as move_extent_start_fail
  bcachefs: trace_move_extent_start_fail() now includes errcode
  bcachefs: Fix split_race livelock
  bcachefs: Fix bucket data type for stripe buckets
  bcachefs: Add missing validation for jset_entry_data_usage
  bcachefs: Fix zstd compress workspace size
  bcachefs: bpos is misaligned on big endian
  bcachefs: Fix ec + durability calculation
  bcachefs: Data update path won't accidentaly grow replicas
  bcachefs: deallocate_extra_replicas()
  bcachefs: Proper refcounting for journal_keys
  bcachefs: preserve device path as device name
  bcachefs: Fix an endianness conversion
  bcachefs: Start gc, copygc, rebalance threads after initing writes ref
  bcachefs: Don't stop copygc thread on device resize
  bcachefs: Make sure bch2_move_ratelimit() also waits for move_ops
  ...
 2023-12-02 06:02:16 +09:00
Mikulas Patocka
41e05548fa dm-flakey: start allocating with MAX_ORDER 
Commit 23baf831a32c ("mm, treewide: redefine MAX_ORDER sanely")
changed the meaning of MAX_ORDER from exclusive to inclusive. So, we
can allocate compound pages with up to 1 << MAX_ORDER pages.

Reflect this change in dm-flakey and start trying to allocate compound
pages with MAX_ORDER.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-11-29 15:47:55 -05:00
Mikulas Patocka
38bc1ab135 dm-verity: align struct dm_verity_fec_io properly 
dm_verity_fec_io is placed after the end of two hash digests. If the hash
digest has unaligned length, struct dm_verity_fec_io could be unaligned.

This commit fixes the placement of struct dm_verity_fec_io, so that it's
aligned.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Fixes: a739ff3f543a ("dm verity: add support for forward error correction")
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-11-29 12:58:06 -05:00
Wu Bo
0193e3966c dm verity: don't perform FEC for failed readahead IO 
We found an issue under Android OTA scenario that many BIOs have to do
FEC where the data under dm-verity is 100% complete and no corruption.

Android OTA has many dm-block layers, from upper to lower:
dm-verity
dm-snapshot
dm-origin & dm-cow
dm-linear
ufs

DM tables have to change 2 times during Android OTA merging process.
When doing table change, the dm-snapshot will be suspended for a while.
During this interval, many readahead IOs are submitted to dm_verity
from filesystem. Then the kverity works are busy doing FEC process
which cost too much time to finish dm-verity IO. This causes needless
delay which feels like system is hung.

After adding debugging it was found that each readahead IO needed
around 10s to finish when this situation occurred. This is due to IO
amplification:

dm-snapshot suspend
erofs_readahead     // 300+ io is submitted
	dm_submit_bio (dm_verity)
		dm_submit_bio (dm_snapshot)
		bio return EIO
		bio got nothing, it's empty
	verity_end_io
	verity_verify_io
	forloop range(0, io->n_blocks)    // each io->nblocks ~= 20
		verity_fec_decode
		fec_decode_rsb
		fec_read_bufs
		forloop range(0, v->fec->rsn) // v->fec->rsn = 253
			new_read
			submit_bio (dm_snapshot)
		end loop
	end loop
dm-snapshot resume

Readahead BIOs get nothing while dm-snapshot is suspended, so all of
them will cause verity's FEC.
Each readahead BIO needs to verify ~20 (io->nblocks) blocks.
Each block needs to do FEC, and every block needs to do 253
(v->fec->rsn) reads.
So during the suspend interval(~200ms), 300 readahead BIOs trigger
~1518000 (300*20*253) IOs to dm-snapshot.

As readahead IO is not required by userspace, and to fix this issue,
it is best to pass readahead errors to upper layer to handle it.

Cc: stable@vger.kernel.org
Fixes: a739ff3f543a ("dm verity: add support for forward error correction")
Signed-off-by: Wu Bo <bo.wu@vivo.com>
Reviewed-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-11-29 12:55:31 -05:00
Wu Bo
7be05bdfb4 dm verity: initialize fec io before freeing it 
If BIO error, verity_end_io() can call verity_finish_io() before
verity_fec_init_io(). Therefore, fec_io->rs is not initialized and
may crash when doing memory freeing in verity_fec_finish_io().

Crash call stack:
 die+0x90/0x2b8
 __do_kernel_fault+0x260/0x298
 do_bad_area+0x2c/0xdc
 do_translation_fault+0x3c/0x54
 do_mem_abort+0x54/0x118
 el1_abort+0x38/0x5c
 el1h_64_sync_handler+0x50/0x90
 el1h_64_sync+0x64/0x6c
 free_rs+0x18/0xac
 fec_rs_free+0x10/0x24
 mempool_free+0x58/0x148
 verity_fec_finish_io+0x4c/0xb0
 verity_end_io+0xb8/0x150

Cc: stable@vger.kernel.org      # v6.0+
Fixes: 5721d4e5a9cd ("dm verity: Add optional "try_verify_in_tasklet" feature")
Signed-off-by: Wu Bo <bo.wu@vivo.com>
Reviewed-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-11-29 12:23:17 -05:00
Markus Weippert
bb6cc25386 bcache: revert replacing IS_ERR_OR_NULL with IS_ERR 
Commit 028ddcac477b ("bcache: Remove unnecessary NULL point check in
node allocations") replaced IS_ERR_OR_NULL by IS_ERR. This leads to a
NULL pointer dereference.

BUG: kernel NULL pointer dereference, address: 0000000000000080
Call Trace:
 ? __die_body.cold+0x1a/0x1f
 ? page_fault_oops+0xd2/0x2b0
 ? exc_page_fault+0x70/0x170
 ? asm_exc_page_fault+0x22/0x30
 ? btree_node_free+0xf/0x160 [bcache]
 ? up_write+0x32/0x60
 btree_gc_coalesce+0x2aa/0x890 [bcache]
 ? bch_extent_bad+0x70/0x170 [bcache]
 btree_gc_recurse+0x130/0x390 [bcache]
 ? btree_gc_mark_node+0x72/0x230 [bcache]
 bch_btree_gc+0x5da/0x600 [bcache]
 ? cpuusage_read+0x10/0x10
 ? bch_btree_gc+0x600/0x600 [bcache]
 bch_gc_thread+0x135/0x180 [bcache]

The relevant code starts with:

    new_nodes[0] = NULL;

    for (i = 0; i < nodes; i++) {
        if (__bch_keylist_realloc(&keylist, bkey_u64s(&r[i].b->key)))
            goto out_nocoalesce;
    // ...
out_nocoalesce:
    // ...
    for (i = 0; i < nodes; i++)
        if (!IS_ERR(new_nodes[i])) {  // IS_ERR_OR_NULL before
028ddcac477b
            btree_node_free(new_nodes[i]);  // new_nodes[0] is NULL
            rw_unlock(true, new_nodes[i]);
        }

This patch replaces IS_ERR() by IS_ERR_OR_NULL() to fix this.

Fixes: 028ddcac477b ("bcache: Remove unnecessary NULL point check in node allocations")
Link: https://lore.kernel.org/all/3DF4A87A-2AC1-4893-AE5F-E921478419A9@suse.de/
Cc: stable@vger.kernel.org
Cc: Zheng Wang <zyytlz.wz@163.com>
Cc: Coly Li <colyli@suse.de>
Signed-off-by: Markus Weippert <markus@gekmihesg.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 2023-11-24 09:39:03 -07:00
Kent Overstreet
d4e3b928ab closures: CLOSURE_CALLBACK() to fix type punning 
Control flow integrity is now checking that type signatures match on
indirect function calls. That breaks closures, which embed a work_struct
in a closure in such a way that a closure_fn may also be used as a
workqueue fn by the underlying closure code.

So we have to change closure fns to take a work_struct as their
argument - but that results in a loss of clarity, as closure fns have
different semantics from normal workqueue functions (they run owning a
ref on the closure, which must be released with continue_at() or
closure_return()).

Thus, this patc introduces CLOSURE_CALLBACK() and closure_type() macros
as suggested by Kees, to smooth things over a bit.

Suggested-by: Kees Cook <keescook@chromium.org>
Cc: Coly Li <colyli@suse.de>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
 2023-11-24 00:29:58 -05:00
Linus Torvalds
bc893f744e block-6.7-2023-11-23 
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Merge tag 'block-6.7-2023-11-23' of git://git.kernel.dk/linux

Pull block fixes from Jens Axboe:
 "A bit bigger than usual at this time, but nothing really earth
  shattering:

   - NVMe pull request via Keith:
       - TCP TLS fixes (Hannes)
       - Authentifaction fixes (Mark, Hannes)
       - Properly terminate target names (Christoph)

   - MD pull request via Song, fixing a raid5 corruption issue

   - Disentanglement of the dependency mess in nvme introduced with the
     tls additions. Now it should actually build on all configs (Arnd)

   - Series of bcache fixes (Coly)

   - Removal of a dead helper (Damien)

   - s390 dasd fix (Muhammad, Jan)

   - lockdep blk-cgroup fixes (Ming)"

* tag 'block-6.7-2023-11-23' of git://git.kernel.dk/linux: (33 commits)
  nvme: tcp: fix compile-time checks for TLS mode
  nvme: target: fix Kconfig select statements
  nvme: target: fix nvme_keyring_id() references
  nvme: move nvme_stop_keep_alive() back to original position
  nbd: pass nbd_sock to nbd_read_reply() instead of index
  s390/dasd: protect device queue against concurrent access
  s390/dasd: resolve spelling mistake
  block/null_blk: Fix double blk_mq_start_request() warning
  nvmet-tcp: always initialize tls_handshake_tmo_work
  nvmet: nul-terminate the NQNs passed in the connect command
  nvme: blank out authentication fabrics options if not configured
  nvme: catch errors from nvme_configure_metadata()
  nvme-tcp: only evaluate 'tls' option if TLS is selected
  nvme-auth: set explanation code for failure2 msgs
  nvme-auth: unlock mutex in one place only
  block: Remove blk_set_runtime_active()
  nbd: fix null-ptr-dereference while accessing 'nbd->config'
  nbd: factor out a helper to get nbd_config without holding 'config_lock'
  nbd: fold nbd config initialization into nbd_alloc_config()
  bcache: avoid NULL checking to c->root in run_cache_set()
  ...
 2023-11-23 17:40:15 -08:00
Jens Axboe
8a554c6234 Merge tag 'md-fixes-20231120' of https://git.kernel.org/pub/scm/linux/kernel/git/song/md into block-6.7 
Pull MD fix from Song.

* tag 'md-fixes-20231120' of https://git.kernel.org/pub/scm/linux/kernel/git/song/md:
  md: fix bi_status reporting in md_end_clone_io
 2023-11-20 09:45:31 -07:00
Coly Li
3eba5e0b24 bcache: avoid NULL checking to c->root in run_cache_set() 
In run_cache_set() after c->root returned from bch_btree_node_get(), it
is checked by IS_ERR_OR_NULL(). Indeed it is unncessary to check NULL
because bch_btree_node_get() will not return NULL pointer to caller.

This patch replaces IS_ERR_OR_NULL() by IS_ERR() for the above reason.

Signed-off-by: Coly Li <colyli@suse.de>
Link: https://lore.kernel.org/r/20231120052503.6122-11-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 2023-11-20 09:17:51 -07:00
Coly Li
31f5b956a1 bcache: add code comments for bch_btree_node_get() and __bch_btree_node_alloc() 
This patch adds code comments to bch_btree_node_get() and
__bch_btree_node_alloc() that NULL pointer will not be returned and it
is unnecessary to check NULL pointer by the callers of these routines.

Signed-off-by: Coly Li <colyli@suse.de>
Link: https://lore.kernel.org/r/20231120052503.6122-10-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 2023-11-20 09:17:51 -07:00
Coly Li
f72f4312d4 bcache: replace a mistaken IS_ERR() by IS_ERR_OR_NULL() in btree_gc_coalesce() 
Commit 028ddcac477b ("bcache: Remove unnecessary NULL point check in
node allocations") do the following change inside btree_gc_coalesce(),

31 @@ -1340,7 +1340,7 @@ static int btree_gc_coalesce(
32         memset(new_nodes, 0, sizeof(new_nodes));
33         closure_init_stack(&cl);
34
35 -       while (nodes < GC_MERGE_NODES && !IS_ERR_OR_NULL(r[nodes].b))
36 +       while (nodes < GC_MERGE_NODES && !IS_ERR(r[nodes].b))
37                 keys += r[nodes++].keys;
38
39         blocks = btree_default_blocks(b->c) * 2 / 3;

At line 35 the original r[nodes].b is not always allocatored from
__bch_btree_node_alloc(), and possibly initialized as NULL pointer by
caller of btree_gc_coalesce(). Therefore the change at line 36 is not
correct.

This patch replaces the mistaken IS_ERR() by IS_ERR_OR_NULL() to avoid
potential issue.

Fixes: 028ddcac477b ("bcache: Remove unnecessary NULL point check in node allocations")
Cc:  <stable@vger.kernel.org> # 6.5+
Cc: Zheng Wang <zyytlz.wz@163.com>
Signed-off-by: Coly Li <colyli@suse.de>
Link: https://lore.kernel.org/r/20231120052503.6122-9-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 2023-11-20 09:17:51 -07:00
Mingzhe Zou
2faac25d79 bcache: fixup multi-threaded bch_sectors_dirty_init() wake-up race 
We get a kernel crash about "unable to handle kernel paging request":

```dmesg
[368033.032005] BUG: unable to handle kernel paging request at ffffffffad9ae4b5
[368033.032007] PGD fc3a0d067 P4D fc3a0d067 PUD fc3a0e063 PMD 8000000fc38000e1
[368033.032012] Oops: 0003 [#1] SMP PTI
[368033.032015] CPU: 23 PID: 55090 Comm: bch_dirtcnt[0] Kdump: loaded Tainted: G           OE    --------- -  - 4.18.0-147.5.1.es8_24.x86_64 #1
[368033.032017] Hardware name: Tsinghua Tongfang THTF Chaoqiang Server/072T6D, BIOS 2.4.3 01/17/2017
[368033.032027] RIP: 0010:native_queued_spin_lock_slowpath+0x183/0x1d0
[368033.032029] Code: 8b 02 48 85 c0 74 f6 48 89 c1 eb d0 c1 e9 12 83 e0
03 83 e9 01 48 c1 e0 05 48 63 c9 48 05 c0 3d 02 00 48 03 04 cd 60 68 93
ad <48> 89 10 8b 42 08 85 c0 75 09 f3 90 8b 42 08 85 c0 74 f7 48 8b 02
[368033.032031] RSP: 0018:ffffbb48852abe00 EFLAGS: 00010082
[368033.032032] RAX: ffffffffad9ae4b5 RBX: 0000000000000246 RCX: 0000000000003bf3
[368033.032033] RDX: ffff97b0ff8e3dc0 RSI: 0000000000600000 RDI: ffffbb4884743c68
[368033.032034] RBP: 0000000000000001 R08: 0000000000000000 R09: 000007ffffffffff
[368033.032035] R10: ffffbb486bb01000 R11: 0000000000000001 R12: ffffffffc068da70
[368033.032036] R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000000
[368033.032038] FS:  0000000000000000(0000) GS:ffff97b0ff8c0000(0000) knlGS:0000000000000000
[368033.032039] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[368033.032040] CR2: ffffffffad9ae4b5 CR3: 0000000fc3a0a002 CR4: 00000000003626e0
[368033.032042] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[368033.032043] bcache: bch_cached_dev_attach() Caching rbd479 as bcache462 on set 8cff3c36-4a76-4242-afaa-7630206bc70b
[368033.032045] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[368033.032046] Call Trace:
[368033.032054]  _raw_spin_lock_irqsave+0x32/0x40
[368033.032061]  __wake_up_common_lock+0x63/0xc0
[368033.032073]  ? bch_ptr_invalid+0x10/0x10 [bcache]
[368033.033502]  bch_dirty_init_thread+0x14c/0x160 [bcache]
[368033.033511]  ? read_dirty_submit+0x60/0x60 [bcache]
[368033.033516]  kthread+0x112/0x130
[368033.033520]  ? kthread_flush_work_fn+0x10/0x10
[368033.034505]  ret_from_fork+0x35/0x40
```

The crash occurred when call wake_up(&state->wait), and then we want
to look at the value in the state. However, bch_sectors_dirty_init()
is not found in the stack of any task. Since state is allocated on
the stack, we guess that bch_sectors_dirty_init() has exited, causing
bch_dirty_init_thread() to be unable to handle kernel paging request.

In order to verify this idea, we added some printing information during
wake_up(&state->wait). We find that "wake up" is printed twice, however
we only expect the last thread to wake up once.

```dmesg
[  994.641004] alcache: bch_dirty_init_thread() wake up
[  994.641018] alcache: bch_dirty_init_thread() wake up
[  994.641523] alcache: bch_sectors_dirty_init() init exit
```

There is a race. If bch_sectors_dirty_init() exits after the first wake
up, the second wake up will trigger this bug("unable to handle kernel
paging request").

Proceed as follows:

bch_sectors_dirty_init
    kthread_run ==============> bch_dirty_init_thread(bch_dirtcnt[0])
            ...                         ...
    atomic_inc(&state.started)          ...
            ...                         ...
    atomic_read(&state.enough)          ...
            ...                 atomic_set(&state->enough, 1)
    kthread_run ======================================================> bch_dirty_init_thread(bch_dirtcnt[1])
            ...                 atomic_dec_and_test(&state->started)            ...
    atomic_inc(&state.started)          ...                                     ...
            ...                 wake_up(&state->wait)                           ...
    atomic_read(&state.enough)                                          atomic_dec_and_test(&state->started)
            ...                                                                 ...
    wait_event(state.wait, atomic_read(&state.started) == 0)                    ...
    return                                                                      ...
                                                                        wake_up(&state->wait)

We believe it is very common to wake up twice if there is no dirty, but
crash is an extremely low probability event. It's hard for us to reproduce
this issue. We attached and detached continuously for a week, with a total
of more than one million attaches and only one crash.

Putting atomic_inc(&state.started) before kthread_run() can avoid waking
up twice.

Fixes: b144e45fc576 ("bcache: make bch_sectors_dirty_init() to be multithreaded")
Signed-off-by: Mingzhe Zou <mingzhe.zou@easystack.cn>
Cc:  <stable@vger.kernel.org>
Signed-off-by: Coly Li <colyli@suse.de>
Link: https://lore.kernel.org/r/20231120052503.6122-8-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 2023-11-20 09:17:51 -07:00
Mingzhe Zou
e34820f984 bcache: fixup lock c->root error 
We had a problem with io hung because it was waiting for c->root to
release the lock.

crash> cache_set.root -l cache_set.list ffffa03fde4c0050
  root = 0xffff802ef454c800
crash> btree -o 0xffff802ef454c800 | grep rw_semaphore
  [ffff802ef454c858] struct rw_semaphore lock;
crash> struct rw_semaphore ffff802ef454c858
struct rw_semaphore {
  count = {
    counter = -4294967297
  },
  wait_list = {
    next = 0xffff00006786fc28,
    prev = 0xffff00005d0efac8
  },
  wait_lock = {
    raw_lock = {
      {
        val = {
          counter = 0
        },
        {
          locked = 0 '\000',
          pending = 0 '\000'
        },
        {
          locked_pending = 0,
          tail = 0
        }
      }
    }
  },
  osq = {
    tail = {
      counter = 0
    }
  },
  owner = 0xffffa03fdc586603
}

The "counter = -4294967297" means that lock count is -1 and a write lock
is being attempted. Then, we found that there is a btree with a counter
of 1 in btree_cache_freeable.

crash> cache_set -l cache_set.list ffffa03fde4c0050 -o|grep btree_cache
  [ffffa03fde4c1140] struct list_head btree_cache;
  [ffffa03fde4c1150] struct list_head btree_cache_freeable;
  [ffffa03fde4c1160] struct list_head btree_cache_freed;
  [ffffa03fde4c1170] unsigned int btree_cache_used;
  [ffffa03fde4c1178] wait_queue_head_t btree_cache_wait;
  [ffffa03fde4c1190] struct task_struct *btree_cache_alloc_lock;
crash> list -H ffffa03fde4c1140|wc -l
973
crash> list -H ffffa03fde4c1150|wc -l
1123
crash> cache_set.btree_cache_used -l cache_set.list ffffa03fde4c0050
  btree_cache_used = 2097
crash> list -s btree -l btree.list -H ffffa03fde4c1140|grep -E -A2 "^  lock = {" > btree_cache.txt
crash> list -s btree -l btree.list -H ffffa03fde4c1150|grep -E -A2 "^  lock = {" > btree_cache_freeable.txt
[root@node-3 127.0.0.1-2023-08-04-16:40:28]# pwd
/var/crash/127.0.0.1-2023-08-04-16:40:28
[root@node-3 127.0.0.1-2023-08-04-16:40:28]# cat btree_cache.txt|grep counter|grep -v "counter = 0"
[root@node-3 127.0.0.1-2023-08-04-16:40:28]# cat btree_cache_freeable.txt|grep counter|grep -v "counter = 0"
      counter = 1

We found that this is a bug in bch_sectors_dirty_init() when locking c->root:
    (1). Thread X has locked c->root(A) write.
    (2). Thread Y failed to lock c->root(A), waiting for the lock(c->root A).
    (3). Thread X bch_btree_set_root() changes c->root from A to B.
    (4). Thread X releases the lock(c->root A).
    (5). Thread Y successfully locks c->root(A).
    (6). Thread Y releases the lock(c->root B).

        down_write locked ---(1)----------------------┐
                |                                     |
                |   down_read waiting ---(2)----┐     |
                |           |               ┌-------------┐ ┌-------------┐
        bch_btree_set_root ===(3)========>> | c->root   A | | c->root   B |
                |           |               └-------------┘ └-------------┘
            up_write ---(4)---------------------┘     |            |
                            |                         |            |
                    down_read locked ---(5)-----------┘            |
                            |                                      |
                        up_read ---(6)-----------------------------┘

Since c->root may change, the correct steps to lock c->root should be
the same as bch_root_usage(), compare after locking.

static unsigned int bch_root_usage(struct cache_set *c)
{
        unsigned int bytes = 0;
        struct bkey *k;
        struct btree *b;
        struct btree_iter iter;

        goto lock_root;

        do {
                rw_unlock(false, b);
lock_root:
                b = c->root;
                rw_lock(false, b, b->level);
        } while (b != c->root);

        for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad)
                bytes += bkey_bytes(k);

        rw_unlock(false, b);

        return (bytes * 100) / btree_bytes(c);
}

Fixes: b144e45fc576 ("bcache: make bch_sectors_dirty_init() to be multithreaded")
Signed-off-by: Mingzhe Zou <mingzhe.zou@easystack.cn>
Cc:  <stable@vger.kernel.org>
Signed-off-by: Coly Li <colyli@suse.de>
Link: https://lore.kernel.org/r/20231120052503.6122-7-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 2023-11-20 09:17:51 -07:00
Mingzhe Zou
7cc47e64d3 bcache: fixup init dirty data errors 
We found that after long run, the dirty_data of the bcache device
will have errors. This error cannot be eliminated unless re-register.

We also found that reattach after detach, this error can accumulate.

In bch_sectors_dirty_init(), all inode <= d->id keys will be recounted
again. This is wrong, we only need to count the keys of the current
device.

Fixes: b144e45fc576 ("bcache: make bch_sectors_dirty_init() to be multithreaded")
Signed-off-by: Mingzhe Zou <mingzhe.zou@easystack.cn>
Cc:  <stable@vger.kernel.org>
Signed-off-by: Coly Li <colyli@suse.de>
Link: https://lore.kernel.org/r/20231120052503.6122-6-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 2023-11-20 09:17:51 -07:00
Rand Deeb
2c7f497ac2 bcache: prevent potential division by zero error 
In SHOW(), the variable 'n' is of type 'size_t.' While there is a
conditional check to verify that 'n' is not equal to zero before
executing the 'do_div' macro, concerns arise regarding potential
division by zero error in 64-bit environments.

The concern arises when 'n' is 64 bits in size, greater than zero, and
the lower 32 bits of it are zeros. In such cases, the conditional check
passes because 'n' is non-zero, but the 'do_div' macro casts 'n' to
'uint32_t,' effectively truncating it to its lower 32 bits.
Consequently, the 'n' value becomes zero.

To fix this potential division by zero error and ensure precise
division handling, this commit replaces the 'do_div' macro with
div64_u64(). div64_u64() is designed to work with 64-bit operands,
guaranteeing that division is performed correctly.

This change enhances the robustness of the code, ensuring that division
operations yield accurate results in all scenarios, eliminating the
possibility of division by zero, and improving compatibility across
different 64-bit environments.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Rand Deeb <rand.sec96@gmail.com>
Cc:  <stable@vger.kernel.org>
Signed-off-by: Coly Li <colyli@suse.de>
Link: https://lore.kernel.org/r/20231120052503.6122-5-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 2023-11-20 09:17:51 -07:00
Colin Ian King
be93825f0e bcache: remove redundant assignment to variable cur_idx 
Variable cur_idx is being initialized with a value that is never read,
it is being re-assigned later in a while-loop. Remove the redundant
assignment. Cleans up clang scan build warning:

drivers/md/bcache/writeback.c:916:2: warning: Value stored to 'cur_idx'
is never read [deadcode.DeadStores]

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Reviewed-by: Coly Li <colyli@suse.de>
Signed-off-by: Coly Li <colyli@suse.de>
Link: https://lore.kernel.org/r/20231120052503.6122-4-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 2023-11-20 09:17:51 -07:00
Coly Li
777967e7e9 bcache: check return value from btree_node_alloc_replacement() 
In btree_gc_rewrite_node(), pointer 'n' is not checked after it returns
from btree_gc_rewrite_node(). There is potential possibility that 'n' is
a non NULL ERR_PTR(), referencing such error code is not permitted in
following code. Therefore a return value checking is necessary after 'n'
is back from btree_node_alloc_replacement().

Signed-off-by: Coly Li <colyli@suse.de>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Cc:  <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20231120052503.6122-3-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 2023-11-20 09:17:51 -07:00
Coly Li
baf8fb7e0e bcache: avoid oversize memory allocation by small stripe_size 
Arraies bcache->stripe_sectors_dirty and bcache->full_dirty_stripes are
used for dirty data writeback, their sizes are decided by backing device
capacity and stripe size. Larger backing device capacity or smaller
stripe size make these two arraies occupies more dynamic memory space.

Currently bcache->stripe_size is directly inherited from
queue->limits.io_opt of underlying storage device. For normal hard
drives, its limits.io_opt is 0, and bcache sets the corresponding
stripe_size to 1TB (1<<31 sectors), it works fine 10+ years. But for
devices do declare value for queue->limits.io_opt, small stripe_size
(comparing to 1TB) becomes an issue for oversize memory allocations of
bcache->stripe_sectors_dirty and bcache->full_dirty_stripes, while the
capacity of hard drives gets much larger in recent decade.

For example a raid5 array assembled by three 20TB hardrives, the raid
device capacity is 40TB with typical 512KB limits.io_opt. After the math
calculation in bcache code, these two arraies will occupy 400MB dynamic
memory. Even worse Andrea Tomassetti reports that a 4KB limits.io_opt is
declared on a new 2TB hard drive, then these two arraies request 2GB and
512MB dynamic memory from kzalloc(). The result is that bcache device
always fails to initialize on his system.

To avoid the oversize memory allocation, bcache->stripe_size should not
directly inherited by queue->limits.io_opt from the underlying device.
This patch defines BCH_MIN_STRIPE_SZ (4MB) as minimal bcache stripe size
and set bcache device's stripe size against the declared limits.io_opt
value from the underlying storage device,
- If the declared limits.io_opt > BCH_MIN_STRIPE_SZ, bcache device will
  set its stripe size directly by this limits.io_opt value.
- If the declared limits.io_opt < BCH_MIN_STRIPE_SZ, bcache device will
  set its stripe size by a value multiplying limits.io_opt and euqal or
  large than BCH_MIN_STRIPE_SZ.

Then the minimal stripe size of a bcache device will always be >= 4MB.
For a 40TB raid5 device with 512KB limits.io_opt, memory occupied by
bcache->stripe_sectors_dirty and bcache->full_dirty_stripes will be 50MB
in total. For a 2TB hard drive with 4KB limits.io_opt, memory occupied
by these two arraies will be 2.5MB in total.

Such mount of memory allocated for bcache->stripe_sectors_dirty and
bcache->full_dirty_stripes is reasonable for most of storage devices.

Reported-by: Andrea Tomassetti <andrea.tomassetti-opensource@devo.com>
Signed-off-by: Coly Li <colyli@suse.de>
Reviewed-by: Eric Wheeler <bcache@lists.ewheeler.net>
Link: https://lore.kernel.org/r/20231120052503.6122-2-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 2023-11-20 09:17:51 -07:00
Song Liu
45b478951b md: fix bi_status reporting in md_end_clone_io 
md_end_clone_io() may overwrite error status in orig_bio->bi_status with
BLK_STS_OK. This could happen when orig_bio has BIO_CHAIN (split by
md_submit_bio => bio_split_to_limits, for example). As a result, upper
layer may miss error reported from md (or the device) and consider the
failed IO was successful.

Fix this by only update orig_bio->bi_status when current bio reports
error and orig_bio is BLK_STS_OK. This is the same behavior as
__bio_chain_endio().

Fixes: 10764815ff47 ("md: add io accounting for raid0 and raid5")
Cc: stable@vger.kernel.org # v5.14+
Reported-by: Bhanu Victor DiCara <00bvd0+linux@gmail.com>
Closes: https://lore.kernel.org/regressions/5727380.DvuYhMxLoT@bvd0/
Signed-off-by: Song Liu <song@kernel.org>
Tested-by: Xiao Ni <xni@redhat.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Guoqing Jiang <guoqing.jiang@linux.dev>
 2023-11-19 20:51:25 -08:00
Mikulas Patocka
13648e04a9 dm-crypt: start allocating with MAX_ORDER 
Commit 23baf831a32c ("mm, treewide: redefine MAX_ORDER sanely")
changed the meaning of MAX_ORDER from exclusive to inclusive. So, we
can allocate compound pages with up to 1 << MAX_ORDER pages.

Reflect this change in dm-crypt and start trying to allocate compound
pages with MAX_ORDER.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-11-17 14:41:15 -05:00
Mikulas Patocka
28f07f2ab4 dm-verity: don't use blocking calls from tasklets 
The commit 5721d4e5a9cd enhanced dm-verity, so that it can verify blocks
from tasklets rather than from workqueues. This reportedly improves
performance significantly.

However, dm-verity was using the flag CRYPTO_TFM_REQ_MAY_SLEEP from
tasklets which resulted in warnings about sleeping function being called
from non-sleeping context.

BUG: sleeping function called from invalid context at crypto/internal.h:206
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 14, name: ksoftirqd/0
preempt_count: 100, expected: 0
RCU nest depth: 0, expected: 0
CPU: 0 PID: 14 Comm: ksoftirqd/0 Tainted: G        W 6.7.0-rc1 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x32/0x50
 __might_resched+0x110/0x160
 crypto_hash_walk_done+0x54/0xb0
 shash_ahash_update+0x51/0x60
 verity_hash_update.isra.0+0x4a/0x130 [dm_verity]
 verity_verify_io+0x165/0x550 [dm_verity]
 ? free_unref_page+0xdf/0x170
 ? psi_group_change+0x113/0x390
 verity_tasklet+0xd/0x70 [dm_verity]
 tasklet_action_common.isra.0+0xb3/0xc0
 __do_softirq+0xaf/0x1ec
 ? smpboot_thread_fn+0x1d/0x200
 ? sort_range+0x20/0x20
 run_ksoftirqd+0x15/0x30
 smpboot_thread_fn+0xed/0x200
 kthread+0xdc/0x110
 ? kthread_complete_and_exit+0x20/0x20
 ret_from_fork+0x28/0x40
 ? kthread_complete_and_exit+0x20/0x20
 ret_from_fork_asm+0x11/0x20
 </TASK>

This commit fixes dm-verity so that it doesn't use the flags
CRYPTO_TFM_REQ_MAY_SLEEP and CRYPTO_TFM_REQ_MAY_BACKLOG from tasklets. The
crypto API would do GFP_ATOMIC allocation instead, it could return -ENOMEM
and we catch -ENOMEM in verity_tasklet and requeue the request to the
workqueue.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org	# v6.0+
Fixes: 5721d4e5a9cd ("dm verity: Add optional "try_verify_in_tasklet" feature")
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-11-17 14:41:14 -05:00
Mikulas Patocka
2a695062a5 dm-bufio: fix no-sleep mode 
dm-bufio has a no-sleep mode. When activated (with the
DM_BUFIO_CLIENT_NO_SLEEP flag), the bufio client is read-only and we
could call dm_bufio_get from tasklets. This is used by dm-verity.

Unfortunately, commit 450e8dee51aa ("dm bufio: improve concurrent IO
performance") broke this and the kernel would warn that cache_get()
was calling down_read() from no-sleeping context. The bug can be
reproduced by using "veritysetup open" with the "--use-tasklets"
flag.

This commit fixes dm-bufio, so that the tasklet mode works again, by
expanding use of the 'no_sleep_enabled' static_key to conditionally
use either a rw_semaphore or rwlock_t (which are colocated in the
buffer_tree structure using a union).

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org	# v6.4
Fixes: 450e8dee51aa ("dm bufio: improve concurrent IO performance")
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-11-17 14:41:14 -05:00
Mikulas Patocka
ccadc8a21e dm-delay: avoid duplicate logic 
This is small refactoring of dm-delay - we avoid duplicate logic in
flush_delayed_bios and flush_delayed_bios_fast and join these two
functions into one.

We also add cond_resched() to flush_delayed_bios because the list may have
unbounded number of entries.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-11-17 14:41:14 -05:00
Mikulas Patocka
38cfff5681 dm-delay: fix bugs introduced by kthread mode 
This commit fixes the following bugs introduced by commit 70bbeb29fab0
("dm delay: for short delays, use kthread instead of timers and wq"):

* the function flush_worker_fn has no exit path - on unload, this
  function will just loop and consume 100% CPU without any progress

* the wake-up mechanism in flush_worker_fn is racy - a wake up will be
  missed if the process adds entries to the delayed_bios list just
  before set_current_state(TASK_INTERRUPTIBLE)

* flush_delayed_bios_fast submits a bio while holding a global mutex;
  this may deadlock if we have multiple stacked dm-delay devices and
  the underlying device attempts to acquire the mutex too

* if the target constructor fails, it will call delay_dtr. delay_dtr
  would attempt to free dc->timer_lock without it being initialized by
  the constructor.

* if the target constructor's kthread allocation fails, delay_dtr
  would crash trying to dereference dc->worker because it is non-NULL
  due to ERR_PTR.

Fixes: 70bbeb29fab0 ("dm delay: for short delays, use kthread instead of timers and wq")
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-11-17 14:41:14 -05:00
Mikulas Patocka
6fc45b6ed9 dm-delay: fix a race between delay_presuspend and delay_bio 
In delay_presuspend, we set the atomic variable may_delay and then stop
the timer and flush pending bios. The intention here is to prevent the
delay target from re-arming the timer again.

However, this test is racy. Suppose that one thread goes to delay_bio,
sees that dc->may_delay is one and proceeds; now, another thread executes
delay_presuspend, it sets dc->may_delay to zero, deletes the timer and
flushes pending bios. Then, the first thread continues and adds the bio to
delayed->list despite the fact that dc->may_delay is false.

Fix this bug by changing may_delay's type from atomic_t to bool and
only access it while holding the delayed_bios_lock mutex. Note that we
don't have to grab the mutex in delay_resume because there are no bios
in flight at this point.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-11-17 14:38:46 -05:00
Linus Torvalds
ecae0bd517 Many singleton patches against the MM code. The patch series which are 
included in this merge do the following:
 
 - Kemeng Shi has contributed some compation maintenance work in the
   series "Fixes and cleanups to compaction".
 
 - Joel Fernandes has a patchset ("Optimize mremap during mutual
   alignment within PMD") which fixes an obscure issue with mremap()'s
   pagetable handling during a subsequent exec(), based upon an
   implementation which Linus suggested.
 
 - More DAMON/DAMOS maintenance and feature work from SeongJae Park i the
   following patch series:
 
 	mm/damon: misc fixups for documents, comments and its tracepoint
 	mm/damon: add a tracepoint for damos apply target regions
 	mm/damon: provide pseudo-moving sum based access rate
 	mm/damon: implement DAMOS apply intervals
 	mm/damon/core-test: Fix memory leaks in core-test
 	mm/damon/sysfs-schemes: Do DAMOS tried regions update for only one apply interval
 
 - In the series "Do not try to access unaccepted memory" Adrian Hunter
   provides some fixups for the recently-added "unaccepted memory' feature.
   To increase the feature's checking coverage.  "Plug a few gaps where
   RAM is exposed without checking if it is unaccepted memory".
 
 - In the series "cleanups for lockless slab shrink" Qi Zheng has done
   some maintenance work which is preparation for the lockless slab
   shrinking code.
 
 - Qi Zheng has redone the earlier (and reverted) attempt to make slab
   shrinking lockless in the series "use refcount+RCU method to implement
   lockless slab shrink".
 
 - David Hildenbrand contributes some maintenance work for the rmap code
   in the series "Anon rmap cleanups".
 
 - Kefeng Wang does more folio conversions and some maintenance work in
   the migration code.  Series "mm: migrate: more folio conversion and
   unification".
 
 - Matthew Wilcox has fixed an issue in the buffer_head code which was
   causing long stalls under some heavy memory/IO loads.  Some cleanups
   were added on the way.  Series "Add and use bdev_getblk()".
 
 - In the series "Use nth_page() in place of direct struct page
   manipulation" Zi Yan has fixed a potential issue with the direct
   manipulation of hugetlb page frames.
 
 - In the series "mm: hugetlb: Skip initialization of gigantic tail
   struct pages if freed by HVO" has improved our handling of gigantic
   pages in the hugetlb vmmemmep optimizaton code.  This provides
   significant boot time improvements when significant amounts of gigantic
   pages are in use.
 
 - Matthew Wilcox has sent the series "Small hugetlb cleanups" - code
   rationalization and folio conversions in the hugetlb code.
 
 - Yin Fengwei has improved mlock()'s handling of large folios in the
   series "support large folio for mlock"
 
 - In the series "Expose swapcache stat for memcg v1" Liu Shixin has
   added statistics for memcg v1 users which are available (and useful)
   under memcg v2.
 
 - Florent Revest has enhanced the MDWE (Memory-Deny-Write-Executable)
   prctl so that userspace may direct the kernel to not automatically
   propagate the denial to child processes.  The series is named "MDWE
   without inheritance".
 
 - Kefeng Wang has provided the series "mm: convert numa balancing
   functions to use a folio" which does what it says.
 
 - In the series "mm/ksm: add fork-exec support for prctl" Stefan Roesch
   makes is possible for a process to propagate KSM treatment across
   exec().
 
 - Huang Ying has enhanced memory tiering's calculation of memory
   distances.  This is used to permit the dax/kmem driver to use "high
   bandwidth memory" in addition to Optane Data Center Persistent Memory
   Modules (DCPMM).  The series is named "memory tiering: calculate
   abstract distance based on ACPI HMAT"
 
 - In the series "Smart scanning mode for KSM" Stefan Roesch has
   optimized KSM by teaching it to retain and use some historical
   information from previous scans.
 
 - Yosry Ahmed has fixed some inconsistencies in memcg statistics in the
   series "mm: memcg: fix tracking of pending stats updates values".
 
 - In the series "Implement IOCTL to get and optionally clear info about
   PTEs" Peter Xu has added an ioctl to /proc/<pid>/pagemap which permits
   us to atomically read-then-clear page softdirty state.  This is mainly
   used by CRIU.
 
 - Hugh Dickins contributed the series "shmem,tmpfs: general maintenance"
   - a bunch of relatively minor maintenance tweaks to this code.
 
 - Matthew Wilcox has increased the use of the VMA lock over file-backed
   page faults in the series "Handle more faults under the VMA lock".  Some
   rationalizations of the fault path became possible as a result.
 
 - In the series "mm/rmap: convert page_move_anon_rmap() to
   folio_move_anon_rmap()" David Hildenbrand has implemented some cleanups
   and folio conversions.
 
 - In the series "various improvements to the GUP interface" Lorenzo
   Stoakes has simplified and improved the GUP interface with an eye to
   providing groundwork for future improvements.
 
 - Andrey Konovalov has sent along the series "kasan: assorted fixes and
   improvements" which does those things.
 
 - Some page allocator maintenance work from Kemeng Shi in the series
   "Two minor cleanups to break_down_buddy_pages".
 
 - In thes series "New selftest for mm" Breno Leitao has developed
   another MM self test which tickles a race we had between madvise() and
   page faults.
 
 - In the series "Add folio_end_read" Matthew Wilcox provides cleanups
   and an optimization to the core pagecache code.
 
 - Nhat Pham has added memcg accounting for hugetlb memory in the series
   "hugetlb memcg accounting".
 
 - Cleanups and rationalizations to the pagemap code from Lorenzo
   Stoakes, in the series "Abstract vma_merge() and split_vma()".
 
 - Audra Mitchell has fixed issues in the procfs page_owner code's new
   timestamping feature which was causing some misbehaviours.  In the
   series "Fix page_owner's use of free timestamps".
 
 - Lorenzo Stoakes has fixed the handling of new mappings of sealed files
   in the series "permit write-sealed memfd read-only shared mappings".
 
 - Mike Kravetz has optimized the hugetlb vmemmap optimization in the
   series "Batch hugetlb vmemmap modification operations".
 
 - Some buffer_head folio conversions and cleanups from Matthew Wilcox in
   the series "Finish the create_empty_buffers() transition".
 
 - As a page allocator performance optimization Huang Ying has added
   automatic tuning to the allocator's per-cpu-pages feature, in the series
   "mm: PCP high auto-tuning".
 
 - Roman Gushchin has contributed the patchset "mm: improve performance
   of accounted kernel memory allocations" which improves their performance
   by ~30% as measured by a micro-benchmark.
 
 - folio conversions from Kefeng Wang in the series "mm: convert page
   cpupid functions to folios".
 
 - Some kmemleak fixups in Liu Shixin's series "Some bugfix about
   kmemleak".
 
 - Qi Zheng has improved our handling of memoryless nodes by keeping them
   off the allocation fallback list.  This is done in the series "handle
   memoryless nodes more appropriately".
 
 - khugepaged conversions from Vishal Moola in the series "Some
   khugepaged folio conversions".
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Merge tag 'mm-stable-2023-11-01-14-33' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull MM updates from Andrew Morton:
 "Many singleton patches against the MM code. The patch series which are
  included in this merge do the following:

   - Kemeng Shi has contributed some compation maintenance work in the
     series 'Fixes and cleanups to compaction'

   - Joel Fernandes has a patchset ('Optimize mremap during mutual
     alignment within PMD') which fixes an obscure issue with mremap()'s
     pagetable handling during a subsequent exec(), based upon an
     implementation which Linus suggested

   - More DAMON/DAMOS maintenance and feature work from SeongJae Park i
     the following patch series:

	mm/damon: misc fixups for documents, comments and its tracepoint
	mm/damon: add a tracepoint for damos apply target regions
	mm/damon: provide pseudo-moving sum based access rate
	mm/damon: implement DAMOS apply intervals
	mm/damon/core-test: Fix memory leaks in core-test
	mm/damon/sysfs-schemes: Do DAMOS tried regions update for only one apply interval

   - In the series 'Do not try to access unaccepted memory' Adrian
     Hunter provides some fixups for the recently-added 'unaccepted
     memory' feature. To increase the feature's checking coverage. 'Plug
     a few gaps where RAM is exposed without checking if it is
     unaccepted memory'

   - In the series 'cleanups for lockless slab shrink' Qi Zheng has done
     some maintenance work which is preparation for the lockless slab
     shrinking code

   - Qi Zheng has redone the earlier (and reverted) attempt to make slab
     shrinking lockless in the series 'use refcount+RCU method to
     implement lockless slab shrink'

   - David Hildenbrand contributes some maintenance work for the rmap
     code in the series 'Anon rmap cleanups'

   - Kefeng Wang does more folio conversions and some maintenance work
     in the migration code. Series 'mm: migrate: more folio conversion
     and unification'

   - Matthew Wilcox has fixed an issue in the buffer_head code which was
     causing long stalls under some heavy memory/IO loads. Some cleanups
     were added on the way. Series 'Add and use bdev_getblk()'

   - In the series 'Use nth_page() in place of direct struct page
     manipulation' Zi Yan has fixed a potential issue with the direct
     manipulation of hugetlb page frames

   - In the series 'mm: hugetlb: Skip initialization of gigantic tail
     struct pages if freed by HVO' has improved our handling of gigantic
     pages in the hugetlb vmmemmep optimizaton code. This provides
     significant boot time improvements when significant amounts of
     gigantic pages are in use

   - Matthew Wilcox has sent the series 'Small hugetlb cleanups' - code
     rationalization and folio conversions in the hugetlb code

   - Yin Fengwei has improved mlock()'s handling of large folios in the
     series 'support large folio for mlock'

   - In the series 'Expose swapcache stat for memcg v1' Liu Shixin has
     added statistics for memcg v1 users which are available (and
     useful) under memcg v2

   - Florent Revest has enhanced the MDWE (Memory-Deny-Write-Executable)
     prctl so that userspace may direct the kernel to not automatically
     propagate the denial to child processes. The series is named 'MDWE
     without inheritance'

   - Kefeng Wang has provided the series 'mm: convert numa balancing
     functions to use a folio' which does what it says

   - In the series 'mm/ksm: add fork-exec support for prctl' Stefan
     Roesch makes is possible for a process to propagate KSM treatment
     across exec()

   - Huang Ying has enhanced memory tiering's calculation of memory
     distances. This is used to permit the dax/kmem driver to use 'high
     bandwidth memory' in addition to Optane Data Center Persistent
     Memory Modules (DCPMM). The series is named 'memory tiering:
     calculate abstract distance based on ACPI HMAT'

   - In the series 'Smart scanning mode for KSM' Stefan Roesch has
     optimized KSM by teaching it to retain and use some historical
     information from previous scans

   - Yosry Ahmed has fixed some inconsistencies in memcg statistics in
     the series 'mm: memcg: fix tracking of pending stats updates
     values'

   - In the series 'Implement IOCTL to get and optionally clear info
     about PTEs' Peter Xu has added an ioctl to /proc/<pid>/pagemap
     which permits us to atomically read-then-clear page softdirty
     state. This is mainly used by CRIU

   - Hugh Dickins contributed the series 'shmem,tmpfs: general
     maintenance', a bunch of relatively minor maintenance tweaks to
     this code

   - Matthew Wilcox has increased the use of the VMA lock over
     file-backed page faults in the series 'Handle more faults under the
     VMA lock'. Some rationalizations of the fault path became possible
     as a result

   - In the series 'mm/rmap: convert page_move_anon_rmap() to
     folio_move_anon_rmap()' David Hildenbrand has implemented some
     cleanups and folio conversions

   - In the series 'various improvements to the GUP interface' Lorenzo
     Stoakes has simplified and improved the GUP interface with an eye
     to providing groundwork for future improvements

   - Andrey Konovalov has sent along the series 'kasan: assorted fixes
     and improvements' which does those things

   - Some page allocator maintenance work from Kemeng Shi in the series
     'Two minor cleanups to break_down_buddy_pages'

   - In thes series 'New selftest for mm' Breno Leitao has developed
     another MM self test which tickles a race we had between madvise()
     and page faults

   - In the series 'Add folio_end_read' Matthew Wilcox provides cleanups
     and an optimization to the core pagecache code

   - Nhat Pham has added memcg accounting for hugetlb memory in the
     series 'hugetlb memcg accounting'

   - Cleanups and rationalizations to the pagemap code from Lorenzo
     Stoakes, in the series 'Abstract vma_merge() and split_vma()'

   - Audra Mitchell has fixed issues in the procfs page_owner code's new
     timestamping feature which was causing some misbehaviours. In the
     series 'Fix page_owner's use of free timestamps'

   - Lorenzo Stoakes has fixed the handling of new mappings of sealed
     files in the series 'permit write-sealed memfd read-only shared
     mappings'

   - Mike Kravetz has optimized the hugetlb vmemmap optimization in the
     series 'Batch hugetlb vmemmap modification operations'

   - Some buffer_head folio conversions and cleanups from Matthew Wilcox
     in the series 'Finish the create_empty_buffers() transition'

   - As a page allocator performance optimization Huang Ying has added
     automatic tuning to the allocator's per-cpu-pages feature, in the
     series 'mm: PCP high auto-tuning'

   - Roman Gushchin has contributed the patchset 'mm: improve
     performance of accounted kernel memory allocations' which improves
     their performance by ~30% as measured by a micro-benchmark

   - folio conversions from Kefeng Wang in the series 'mm: convert page
     cpupid functions to folios'

   - Some kmemleak fixups in Liu Shixin's series 'Some bugfix about
     kmemleak'

   - Qi Zheng has improved our handling of memoryless nodes by keeping
     them off the allocation fallback list. This is done in the series
     'handle memoryless nodes more appropriately'

   - khugepaged conversions from Vishal Moola in the series 'Some
     khugepaged folio conversions'"

[ bcachefs conflicts with the dynamically allocated shrinkers have been
  resolved as per Stephen Rothwell in

     https://lore.kernel.org/all/20230913093553.4290421e@canb.auug.org.au/

  with help from Qi Zheng.

  The clone3 test filtering conflict was half-arsed by yours truly ]

* tag 'mm-stable-2023-11-01-14-33' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (406 commits)
  mm/damon/sysfs: update monitoring target regions for online input commit
  mm/damon/sysfs: remove requested targets when online-commit inputs
  selftests: add a sanity check for zswap
  Documentation: maple_tree: fix word spelling error
  mm/vmalloc: fix the unchecked dereference warning in vread_iter()
  zswap: export compression failure stats
  Documentation: ubsan: drop "the" from article title
  mempolicy: migration attempt to match interleave nodes
  mempolicy: mmap_lock is not needed while migrating folios
  mempolicy: alloc_pages_mpol() for NUMA policy without vma
  mm: add page_rmappable_folio() wrapper
  mempolicy: remove confusing MPOL_MF_LAZY dead code
  mempolicy: mpol_shared_policy_init() without pseudo-vma
  mempolicy trivia: use pgoff_t in shared mempolicy tree
  mempolicy trivia: slightly more consistent naming
  mempolicy trivia: delete those ancient pr_debug()s
  mempolicy: fix migrate_pages(2) syscall return nr_failed
  kernfs: drop shared NUMA mempolicy hooks
  hugetlbfs: drop shared NUMA mempolicy pretence
  mm/damon/sysfs-test: add a unit test for damon_sysfs_set_targets()
  ...
 2023-11-02 19:38:47 -10:00
Linus Torvalds
426ee5196d sysctl-6.7-rc1 
To help make the move of sysctls out of kernel/sysctl.c not incur a size
 penalty sysctl has been changed to allow us to not require the sentinel, the
 final empty element on the sysctl array. Joel Granados has been doing all this
 work. On the v6.6 kernel we got the major infrastructure changes required to
 support this. For v6.7-rc1 we have all arch/ and drivers/ modified to remove
 the sentinel. Both arch and driver changes have been on linux-next for a bit
 less than a month. It is worth re-iterating the value:
 
   - this helps reduce the overall build time size of the kernel and run time
      memory consumed by the kernel by about ~64 bytes per array
   - the extra 64-byte penalty is no longer inncurred now when we move sysctls
     out from kernel/sysctl.c to their own files
 
 For v6.8-rc1 expect removal of all the sentinels and also then the unneeded
 check for procname == NULL.
 
 The last 2 patches are fixes recently merged by Krister Johansen which allow
 us again to use softlockup_panic early on boot. This used to work but the
 alias work broke it. This is useful for folks who want to detect softlockups
 super early rather than wait and spend money on cloud solutions with nothing
 but an eventual hung kernel. Although this hadn't gone through linux-next it's
 also a stable fix, so we might as well roll through the fixes now.
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Merge tag 'sysctl-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux

Pull sysctl updates from Luis Chamberlain:
 "To help make the move of sysctls out of kernel/sysctl.c not incur a
  size penalty sysctl has been changed to allow us to not require the
  sentinel, the final empty element on the sysctl array. Joel Granados
  has been doing all this work. On the v6.6 kernel we got the major
  infrastructure changes required to support this. For v6.7-rc1 we have
  all arch/ and drivers/ modified to remove the sentinel. Both arch and
  driver changes have been on linux-next for a bit less than a month. It
  is worth re-iterating the value:

   - this helps reduce the overall build time size of the kernel and run
     time memory consumed by the kernel by about ~64 bytes per array

   - the extra 64-byte penalty is no longer inncurred now when we move
     sysctls out from kernel/sysctl.c to their own files

  For v6.8-rc1 expect removal of all the sentinels and also then the
  unneeded check for procname == NULL.

  The last two patches are fixes recently merged by Krister Johansen
  which allow us again to use softlockup_panic early on boot. This used
  to work but the alias work broke it. This is useful for folks who want
  to detect softlockups super early rather than wait and spend money on
  cloud solutions with nothing but an eventual hung kernel. Although
  this hadn't gone through linux-next it's also a stable fix, so we
  might as well roll through the fixes now"

* tag 'sysctl-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux: (23 commits)
  watchdog: move softlockup_panic back to early_param
  proc: sysctl: prevent aliased sysctls from getting passed to init
  intel drm: Remove now superfluous sentinel element from ctl_table array
  Drivers: hv: Remove now superfluous sentinel element from ctl_table array
  raid: Remove now superfluous sentinel element from ctl_table array
  fw loader: Remove the now superfluous sentinel element from ctl_table array
  sgi-xp: Remove the now superfluous sentinel element from ctl_table array
  vrf: Remove the now superfluous sentinel element from ctl_table array
  char-misc: Remove the now superfluous sentinel element from ctl_table array
  infiniband: Remove the now superfluous sentinel element from ctl_table array
  macintosh: Remove the now superfluous sentinel element from ctl_table array
  parport: Remove the now superfluous sentinel element from ctl_table array
  scsi: Remove now superfluous sentinel element from ctl_table array
  tty: Remove now superfluous sentinel element from ctl_table array
  xen: Remove now superfluous sentinel element from ctl_table array
  hpet: Remove now superfluous sentinel element from ctl_table array
  c-sky: Remove now superfluous sentinel element from ctl_talbe array
  powerpc: Remove now superfluous sentinel element from ctl_table arrays
  riscv: Remove now superfluous sentinel element from ctl_table array
  x86/vdso: Remove now superfluous sentinel element from ctl_table array
  ...
 2023-11-01 20:51:41 -10:00
Linus Torvalds
0364249d20 - Update DM core to directly call the map function for both the linear 
and stripe targets; which are provided by DM core.
 
 - Various updates to use new safer string functions.
 
 - Update DM core to respect REQ_NOWAIT flag in normal bios so that
   memory allocations are always attempted with GFP_NOWAIT.
 
 - Add Mikulas Patocka to MAINTAINERS as a DM maintainer!
 
 - Improve DM delay target's handling of short delays (< 50ms) by using
   a kthread to check expiration of IOs rather than timers and a wq.
 
 - Update the DM error target so that it works with zoned storage. This
   helps xfstests to provide proper IO error handling coverage when
   testing a filesystem with native zoned storage support.
 
 - Update both DM crypt and integrity targets to improve performance by
   using crypto_shash_digest() rather than init+update+final sequence.
 
 - Fix DM crypt target by backfilling missing memory allocation
   accounting for compound pages.
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Merge tag 'for-6.7/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper updates from Mike Snitzer:

 - Update DM core to directly call the map function for both the linear
   and stripe targets; which are provided by DM core

 - Various updates to use new safer string functions

 - Update DM core to respect REQ_NOWAIT flag in normal bios so that
   memory allocations are always attempted with GFP_NOWAIT

 - Add Mikulas Patocka to MAINTAINERS as a DM maintainer!

 - Improve DM delay target's handling of short delays (< 50ms) by using
   a kthread to check expiration of IOs rather than timers and a wq

 - Update the DM error target so that it works with zoned storage. This
   helps xfstests to provide proper IO error handling coverage when
   testing a filesystem with native zoned storage support

 - Update both DM crypt and integrity targets to improve performance by
   using crypto_shash_digest() rather than init+update+final sequence

 - Fix DM crypt target by backfilling missing memory allocation
   accounting for compound pages

* tag 'for-6.7/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm crypt: account large pages in cc->n_allocated_pages
  dm integrity: use crypto_shash_digest() in sb_mac()
  dm crypt: use crypto_shash_digest() in crypt_iv_tcw_whitening()
  dm error: Add support for zoned block devices
  dm delay: for short delays, use kthread instead of timers and wq
  MAINTAINERS: add Mikulas Patocka as a DM maintainer
  dm: respect REQ_NOWAIT flag in normal bios issued to DM
  dm: enhance alloc_multiple_bios() to be more versatile
  dm: make __send_duplicate_bios return unsigned int
  dm log userspace: replace deprecated strncpy with strscpy
  dm ioctl: replace deprecated strncpy with strscpy_pad
  dm crypt: replace open-coded kmemdup_nul
  dm cache metadata: replace deprecated strncpy with strscpy
  dm: shortcut the calls to linear_map and stripe_map
 2023-11-01 12:55:54 -10:00
Linus Torvalds
90d624af2e for-6.7/block-2023-10-30 
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Merge tag 'for-6.7/block-2023-10-30' of git://git.kernel.dk/linux

Pull block updates from Jens Axboe:

 - Improvements to the queue_rqs() support, and adding null_blk support
   for that as well (Chengming)

 - Series improving badblocks support (Coly)

 - Key store support for sed-opal (Greg)

 - IBM partition string handling improvements (Jan)

 - Make number of ublk devices supported configurable (Mike)

 - Cancelation improvements for ublk (Ming)

 - MD pull requests via Song:
     - Handle timeout in md-cluster, by Denis Plotnikov
     - Cleanup pers->prepare_suspend, by Yu Kuai
     - Rewrite mddev_suspend(), by Yu Kuai
     - Simplify md_seq_ops, by Yu Kuai
     - Reduce unnecessary locking array_state_store(), by Mariusz
       Tkaczyk
     - Make rdev add/remove independent from daemon thread, by Yu Kuai
     - Refactor code around quiesce() and mddev_suspend(), by Yu Kuai

 - NVMe pull request via Keith:
     - nvme-auth updates (Mark)
     - nvme-tcp tls (Hannes)
     - nvme-fc annotaions (Kees)

 - Misc cleanups and improvements (Jiapeng, Joel)

* tag 'for-6.7/block-2023-10-30' of git://git.kernel.dk/linux: (95 commits)
  block: ublk_drv: Remove unused function
  md: cleanup pers->prepare_suspend()
  nvme-auth: allow mixing of secret and hash lengths
  nvme-auth: use transformed key size to create resp
  nvme-auth: alloc nvme_dhchap_key as single buffer
  nvmet-tcp: use 'spin_lock_bh' for state_lock()
  powerpc/pseries: PLPKS SED Opal keystore support
  block: sed-opal: keystore access for SED Opal keys
  block:sed-opal: SED Opal keystore
  ublk: simplify aborting request
  ublk: replace monitor with cancelable uring_cmd
  ublk: quiesce request queue when aborting queue
  ublk: rename mm_lock as lock
  ublk: move ublk_cancel_dev() out of ub->mutex
  ublk: make sure io cmd handled in submitter task context
  ublk: don't get ublk device reference in ublk_abort_queue()
  ublk: Make ublks_max configurable
  ublk: Limit dev_id/ub_number values
  md-cluster: check for timeout while a new disk adding
  nvme: rework NVME_AUTH Kconfig selection
  ...
 2023-11-01 12:30:07 -10:00
Mikulas Patocka
9793c269da dm crypt: account large pages in cc->n_allocated_pages 
The commit 5054e778fcd9c ("dm crypt: allocate compound pages if
possible") changed dm-crypt to use compound pages to improve
performance. Unfortunately, there was an oversight: the allocation of
compound pages was not accounted at all. Normal pages are accounted in
a percpu counter cc->n_allocated_pages and dm-crypt is limited to
allocate at most 2% of memory. Because compound pages were not
accounted at all, dm-crypt could allocate memory over the 2% limit.

Fix this by adding the accounting of compound pages, so that memory
consumption of dm-crypt is properly limited.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Fixes: 5054e778fcd9c ("dm crypt: allocate compound pages if possible")
Cc: stable@vger.kernel.org	# v6.5+
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-10-31 14:25:06 -04:00
Eric Biggers
070bb43ab0 dm integrity: use crypto_shash_digest() in sb_mac() 
Simplify sb_mac() by using crypto_shash_digest() instead of an
init+update+final sequence.  This should also improve performance.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-10-31 11:06:21 -04:00
Eric Biggers
6d0ee3b680 dm crypt: use crypto_shash_digest() in crypt_iv_tcw_whitening() 
Simplify crypt_iv_tcw_whitening() by using crypto_shash_digest() instead
of an init+update+final sequence.  This should also improve performance.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-10-31 11:06:21 -04:00
Damien Le Moal
a951104333 dm error: Add support for zoned block devices 
dm-error is used in several test cases in the xfstests test suite to
check the handling of IO errors in file systems. However, with several
file systems getting native support for zoned block devices (e.g.
btrfs and f2fs), dm-error's lack of zoned block device support creates
problems as the file system attempts executing zone commands (e.g. a
zone append operation) against a dm-error non-zoned block device,
which causes various issues in the block layer (e.g. WARN_ON
triggers).

This commit adds supports for zoned block devices to dm-error, allowing
a DM device table containing an error target to be exposed as a zoned
block device (if all targets have a compatible zoned model support and
mapping). This is done as follows:
1) Allow passing 2 arguments to an error target, similar to dm-linear:
   a backing device and a start sector. These arguments are optional and
   dm-error retains its characteristics if the arguments are not
   specified.
2) Implement the iterate_devices method so that dm-core can normally
   check the zone support and restrictions (e.g. zone alignment of the
   targets). When the backing device arguments are not specified, the
   iterate_devices method never calls the fn() argument.
When no backing device is specified, as before, we assume that the DM
device is not zoned. When the backing device arguments are specified,
the zoned model of the DM device will depend on the backing device
type:
 - If the backing device is zoned and its model and mapping is
   compatible with other targets of the device, the resulting device
   will be zoned, with the dm-error mapped portion always returning
   errors (similar to the default non-zoned case).
 - If the backing device is not zoned, then the DM device will not be
   either.

This zone support for dm-error requires the definition of a functional
report_zones operation so that dm_revalidate_zones() can operate
correctly and resources for emulating zone append operations
initialized. This is necessary for cases where dm-error is used to
partially map a device and have an overall correct handling of zone
append. This means that dm-error does not fail report zones operations.

Two changes that are not obvious are included to avoid issues:
1) dm_table_supports_zoned_model() is changed to directly check if
   the backing device of a wildcard target (= dm-error target) is
   zoned. Otherwise, we wouldn't be able to catch the invalid setup of
   dm-error without a backing device (non zoned case) being combined
   with zoned targets.
2) dm_table_supports_dax() is modified to return false if the wildcard
   target is found. Otherwise, when dm-error is set without a backing
   device, we end up with a NULL pointer dereference in
   set_dax_synchronous (dax_dev is NULL). This is consistent with the
   current behavior because dm_table_supports_dax() always returned
   false for targets that do not define the iterate_devices method.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Tested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-10-31 11:06:21 -04:00
Christian Loehle
70bbeb29fa dm delay: for short delays, use kthread instead of timers and wq 
DM delay's current design of using timers and wq to realize the delays
is insufficient for delays below ~50ms.

This commit enhances the design to use a kthread to flush the expired
delays, trading some CPU time (in some cases) for better delay
accuracy and delays closer to what the user requested for smaller
delays. The new design is chosen as long as all the delays are below
50ms.

Since bios can't be completed in interrupt context using a kthread
is probably the most reasonable way to approach this.

Testing with
echo "0 2097152 zero" | dmsetup create dm-zeros
for i in $(seq 0 20);
do
  echo "0 2097152 delay /dev/mapper/dm-zeros 0 $i" | dmsetup create dm-delay-${i}ms;
done

Some performance numbers for comparison, on beaglebone black (single
core) CONFIG_HZ_1000=y:

fio --name=1msread --rw=randread --bs=4k --runtime=60 --time_based \
    --filename=/dev/mapper/dm-delay-1ms
Theoretical maximum: 1000 IOPS
Previous: 250 IOPS
Kthread: 500 IOPS

fio --name=10msread --rw=randread --bs=4k --runtime=60 --time_based \
    --filename=/dev/mapper/dm-delay-10ms
Theoretical maximum: 100 IOPS
Previous: 45 IOPS
Kthread: 50 IOPS

fio --name=1mswrite --rw=randwrite --direct=1 --bs=4k --runtime=60 \
    --time_based --filename=/dev/mapper/dm-delay-1ms
Theoretical maximum: 1000 IOPS
Previous: 498 IOPS
Kthread: 1000 IOPS

fio --name=10mswrite --rw=randwrite --direct=1 --bs=4k --runtime=60 \
    --time_based --filename=/dev/mapper/dm-delay-10ms
Theoretical maximum: 100 IOPS
Previous: 90 IOPS
Kthread: 100 IOPS

(This one is just to prove the new design isn't impacting throughput,
not really about delays):
fio --name=10mswriteasync --rw=randwrite --direct=1 --bs=4k \
    --runtime=60 --time_based --filename=/dev/mapper/dm-delay-10ms \
    --numjobs=32 --iodepth=64 --ioengine=libaio --group_reporting
Previous: 13.3k IOPS
Kthread: 13.3k IOPS

Signed-off-by: Christian Loehle <christian.loehle@arm.com>
[Harshit: kthread_create error handling fix in delay_ctr]
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-10-31 11:06:21 -04:00
Linus Torvalds
befaa609f4 hardening updates for v6.7-rc1 
- Add LKDTM test for stuck CPUs (Mark Rutland)
 
 - Improve LKDTM selftest behavior under UBSan (Ricardo Cañuelo)
 
 - Refactor more 1-element arrays into flexible arrays (Gustavo A. R. Silva)
 
 - Analyze and replace strlcpy and strncpy uses (Justin Stitt, Azeem Shaikh)
 
 - Convert group_info.usage to refcount_t (Elena Reshetova)
 
 - Add __counted_by annotations (Kees Cook, Gustavo A. R. Silva)
 
 - Add Kconfig fragment for basic hardening options (Kees Cook, Lukas Bulwahn)
 
 - Fix randstruct GCC plugin performance mode to stay in groups (Kees Cook)
 
 - Fix strtomem() compile-time check for small sources (Kees Cook)
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Merge tag 'hardening-v6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull hardening updates from Kees Cook:
 "One of the more voluminous set of changes is for adding the new
  __counted_by annotation[1] to gain run-time bounds checking of
  dynamically sized arrays with UBSan.

   - Add LKDTM test for stuck CPUs (Mark Rutland)

   - Improve LKDTM selftest behavior under UBSan (Ricardo Cañuelo)

   - Refactor more 1-element arrays into flexible arrays (Gustavo A. R.
     Silva)

   - Analyze and replace strlcpy and strncpy uses (Justin Stitt, Azeem
     Shaikh)

   - Convert group_info.usage to refcount_t (Elena Reshetova)

   - Add __counted_by annotations (Kees Cook, Gustavo A. R. Silva)

   - Add Kconfig fragment for basic hardening options (Kees Cook, Lukas
     Bulwahn)

   - Fix randstruct GCC plugin performance mode to stay in groups (Kees
     Cook)

   - Fix strtomem() compile-time check for small sources (Kees Cook)"

* tag 'hardening-v6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: (56 commits)
  hwmon: (acpi_power_meter) replace open-coded kmemdup_nul
  reset: Annotate struct reset_control_array with __counted_by
  kexec: Annotate struct crash_mem with __counted_by
  virtio_console: Annotate struct port_buffer with __counted_by
  ima: Add __counted_by for struct modsig and use struct_size()
  MAINTAINERS: Include stackleak paths in hardening entry
  string: Adjust strtomem() logic to allow for smaller sources
  hardening: x86: drop reference to removed config AMD_IOMMU_V2
  randstruct: Fix gcc-plugin performance mode to stay in group
  mailbox: zynqmp: Annotate struct zynqmp_ipi_pdata with __counted_by
  drivers: thermal: tsens: Annotate struct tsens_priv with __counted_by
  irqchip/imx-intmux: Annotate struct intmux_data with __counted_by
  KVM: Annotate struct kvm_irq_routing_table with __counted_by
  virt: acrn: Annotate struct vm_memory_region_batch with __counted_by
  hwmon: Annotate struct gsc_hwmon_platform_data with __counted_by
  sparc: Annotate struct cpuinfo_tree with __counted_by
  isdn: kcapi: replace deprecated strncpy with strscpy_pad
  isdn: replace deprecated strncpy with strscpy
  NFS/flexfiles: Annotate struct nfs4_ff_layout_segment with __counted_by
  nfs41: Annotate struct nfs4_file_layout_dsaddr with __counted_by
  ...
 2023-10-30 19:09:55 -10:00
Linus Torvalds
9e87705289 Initial bcachefs pull request for 6.7-rc1 
Here's the bcachefs filesystem pull request.
 
 One new patch since last week: the exportfs constants ended up
 conflicting with other filesystems that are also getting added to the
 global enum, so switched to new constants picked by Amir.
 
 I'll also be sending another pull request later on in the cycle bringing
 things up to date my master branch that people are currently running;
 that will be restricted to fs/bcachefs/, naturally.
 
 Testing - fstests as well as the bcachefs specific tests in ktest:
   https://evilpiepirate.org/~testdashboard/ci?branch=bcachefs-for-upstream
 
 It's also been soaking in linux-next, which resulted in a whole bunch of
 smatch complaints and fixes and a patch or two from Kees.
 
 The only new non fs/bcachefs/ patch is the objtool patch that adds
 bcachefs functions to the list of noreturns. The patch that exports
 osq_lock() has been dropped for now, per Ingo.
 
 Prereq patch list:
 
 faf1dce85275 objtool: Add bcachefs noreturns
 73badee4280c lib/generic-radix-tree.c: Add peek_prev()
 9492261ff246 lib/generic-radix-tree.c: Don't overflow in peek()
 0fb5d567f573 MAINTAINERS: Add entry for generic-radix-tree
 b414e8ecd498 closures: Add a missing include
 48b7935722b8 closures: closure_nr_remaining()
 ced58fc7ab9f closures: closure_wait_event()
 bd0d22e41ecb MAINTAINERS: Add entry for closures
 8c8d2d9670e8 bcache: move closures to lib/
 957e48087dfa locking: export contention tracepoints for bcachefs six locks
 21db931445d8 lib: Export errname
 83feeb195592 lib/string_helpers: string_get_size() now returns characters wrote
 7d672f40941a stacktrace: Export stack_trace_save_tsk
 771eb4fe8b42 fs: factor out d_mark_tmpfile()
 2b69987be575 sched: Add task_struct->faults_disabled_mapping
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Merge tag 'bcachefs-2023-10-30' of https://evilpiepirate.org/git/bcachefs

Pull initial bcachefs updates from Kent Overstreet:
 "Here's the bcachefs filesystem pull request.

  One new patch since last week: the exportfs constants ended up
  conflicting with other filesystems that are also getting added to the
  global enum, so switched to new constants picked by Amir.

  The only new non fs/bcachefs/ patch is the objtool patch that adds
  bcachefs functions to the list of noreturns. The patch that exports
  osq_lock() has been dropped for now, per Ingo"

* tag 'bcachefs-2023-10-30' of https://evilpiepirate.org/git/bcachefs: (2781 commits)
  exportfs: Change bcachefs fid_type enum to avoid conflicts
  bcachefs: Refactor memcpy into direct assignment
  bcachefs: Fix drop_alloc_keys()
  bcachefs: snapshot_create_lock
  bcachefs: Fix snapshot skiplists during snapshot deletion
  bcachefs: bch2_sb_field_get() refactoring
  bcachefs: KEY_TYPE_error now counts towards i_sectors
  bcachefs: Fix handling of unknown bkey types
  bcachefs: Switch to unsafe_memcpy() in a few places
  bcachefs: Use struct_size()
  bcachefs: Correctly initialize new buckets on device resize
  bcachefs: Fix another smatch complaint
  bcachefs: Use strsep() in split_devs()
  bcachefs: Add iops fields to bch_member
  bcachefs: Rename bch_sb_field_members -> bch_sb_field_members_v1
  bcachefs: New superblock section members_v2
  bcachefs: Add new helper to retrieve bch_member from sb
  bcachefs: bucket_lock() is now a sleepable lock
  bcachefs: fix crc32c checksum merge byte order problem
  bcachefs: Fix bch2_inode_delete_keys()
  ...
 2023-10-30 11:09:38 -10:00
Jan Kara
b3856da790
bcache: Fixup error handling in register_cache() 
Coverity has noticed that the printing of error message in
register_cache() uses already freed bdev_handle to get to bdev. In fact
the problem has been there even before commit "bcache: Convert to
bdev_open_by_path()" just a bit more subtle one - cache object itself
could have been freed by the time we looked at ca->bdev and we don't
hold any reference to bdev either so even that could in principle go
away (due to device unplug or similar). Fix all these problems by
printing the error message before closing the bdev.

Fixes: dc893f51d24a ("bcache: Convert to bdev_open_by_path()")
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20231004093757.11560-1-jack@suse.cz
Asked-by: Coly Li <colyli@suse.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>
 2023-10-28 13:29:22 +02:00
Jan Kara
9f0f5a30d3
md: Convert to bdev_open_by_dev() 
Convert md to use bdev_open_by_dev() and pass the handle around. We also
don't need the 'Holder' flag anymore so remove it.

CC: linux-raid@vger.kernel.org
CC: Song Liu <song@kernel.org>
Acked-by: Song Liu <song@kernel.org>
Acked-by: Christoph Hellwig <hch@lst.de>
Acked-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230927093442.25915-11-jack@suse.cz
Signed-off-by: Christian Brauner <brauner@kernel.org>
 2023-10-28 13:29:18 +02:00
Jan Kara
c2fce61fb2
dm: Convert to bdev_open_by_dev() 
Convert device mapper to use bdev_open_by_dev() and pass the handle
around.

CC: Alasdair Kergon <agk@redhat.com>
CC: Mike Snitzer <snitzer@kernel.org>
CC: dm-devel@redhat.com
Acked-by: Christoph Hellwig <hch@lst.de>
Acked-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230927093442.25915-10-jack@suse.cz
Signed-off-by: Christian Brauner <brauner@kernel.org>
 2023-10-28 13:29:18 +02:00
Jan Kara
631b001fd6
bcache: Convert to bdev_open_by_path() 
Convert bcache to use bdev_open_by_path() and pass the handle around.

CC: linux-bcache@vger.kernel.org
CC: Coly Li <colyli@suse.de>
CC: Kent Overstreet <kent.overstreet@gmail.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Acked-by: Christian Brauner <brauner@kernel.org>
Acked-by: Coly Li <colyli@suse.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230927093442.25915-9-jack@suse.cz
Signed-off-by: Christian Brauner <brauner@kernel.org>
 2023-10-28 13:29:17 +02:00
Mike Snitzer
6f25dd1c57 dm: respect REQ_NOWAIT flag in normal bios issued to DM 
Update DM core's normal IO submission to allocate required memory
using GFP_NOWAIT if REQ_NOWAIT is set.

Tested with simple test provided in commit a9ce385344f916 ("dm: don't
attempt to queue IO under RCU protection") that was enhanced to check
error codes.  Also tested using fio's pvsync2 with nowait=1.

But testing with induced GFP_NOWAIT allocation failures wasn't
performed (yet).

Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-10-27 13:22:51 -04:00
Mike Snitzer
4a2fe29608 dm: enhance alloc_multiple_bios() to be more versatile 
alloc_multiple_bios() has the useful ability to try allocating bios
with GFP_NOWAIT but will fallback to using GFP_NOIO.  The callers
service both empty flush bios and abnormal bios (e.g. discard).

alloc_multiple_bios() enhancements offered in this commit:
- don't require table_devices_lock if num_bios = 1
- allow caller to pass GFP_NOWAIT to do usual GFP_NOWAIT with GFP_NOIO
  fallback
- allow caller to pass GFP_NOIO to _only_ allocate using GFP_NOIO

Flush bios with data may be issued to DM with REQ_NOWAIT, as such it
makes sense to attempt servicing them with GFP_NOWAIT allocations.

But abnormal IO should never be issued using REQ_NOWAIT (if that
changes in the future that's fine, but no sense supporting it now).

While at it, rename __send_changing_extent_only() to
__send_abnormal_io().

[Thanks to both Ming and Mikulas for help with translating known
possible IO scenarios to requirements.]

Suggested-by: Ming Lei <ming.lei@redhat.com>
Suggested-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-10-27 12:44:18 -04:00
Mikulas Patocka
34dbaa88ca dm: make __send_duplicate_bios return unsigned int 
All the callers cast the value returned by __send_duplicate_bios to
unsigned int type, so we can return unsigned int as well.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-10-23 13:07:36 -04:00
Justin Stitt
18ac523329 dm log userspace: replace deprecated strncpy with strscpy 
`strncpy` is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string
interfaces.

`lc` is already zero-allocated:
|       lc = kzalloc(sizeof(*lc), GFP_KERNEL);
... as such, any future NUL-padding is superfluous.

A suitable replacement is `strscpy` [2] due to the fact that it
guarantees NUL-termination on the destination buffer without
unnecessarily NUL-padding.

Let's also go with the more idiomatic `dest, src, sizeof(dest)` pattern
for destination buffers that the compiler can calculate the size for.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
Link: https://github.com/KSPP/linux/issues/90
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Justin Stitt <justinstitt@google.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-10-23 13:02:48 -04:00
Justin Stitt
0ffb645ea8 dm ioctl: replace deprecated strncpy with strscpy_pad 
`strncpy` is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string
interfaces.

We expect `spec->target_type` to be NUL-terminated based on its use with
a format string after `dm_table_add_target()` is called
| 	r = dm_table_add_target(table, spec->target_type,
| 				(sector_t) spec->sector_start,
| 				(sector_t) spec->length,
| 				target_params);
... wherein `spec->target_type` is passed as parameter `type` and later
printed with DMERR:
|       DMERR("%s: %s: unknown target type", dm_device_name(t->md), type);

It appears that `spec` is not zero-allocated and thus NUL-padding may be
required in this ioctl context.

Considering the above, a suitable replacement is `strscpy_pad` due to
the fact that it guarantees NUL-termination whilst maintaining the
NUL-padding behavior that strncpy provides.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://github.com/KSPP/linux/issues/90
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Justin Stitt <justinstitt@google.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-10-23 13:02:37 -04:00
Justin Stitt
e9d7bd2c86 dm crypt: replace open-coded kmemdup_nul 
kzalloc() followed by strncpy() on an expected NUL-terminated string is
just kmemdup_nul(). Let's simplify this code (while also dropping a
deprecated strncpy() call [1]).

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://github.com/KSPP/linux/issues/90
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Justin Stitt <justinstitt@google.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
 2023-10-23 13:02:25 -04:00