platform/kernel/linux-rpi.git
3 years agonvmet: add set feature tracing support
Hou Pu [Mon, 5 Jul 2021 03:15:29 +0000 (11:15 +0800)]
nvmet: add set feature tracing support

A nvme connect command produces following trace from the target side.

Before:
    kworker/0:1H-56      [000] ....  9012.155139: nvmet_req_init: nvmet1: qid=0, cmdid=16, nsid=0, flags=0x40, meta=0x0, cmd=(nvme_admin_set_features, cdw10=07 00 00 00 07 00 07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00)
    kworker/0:1H-56      [000] ....  9012.872272: nvmet_req_init: nvmet1: qid=0, cmdid=13, nsid=0, flags=0x40, meta=0x0, cmd=(nvme_admin_set_features, cdw10=0b 00 00 00 00 09 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00)

cmdline:/sys/kernel/debug/tracing# cat trace | grep feature
    kworker/0:1H-56      [000] ....   203.493914: nvmet_req_init: nvmet1: qid=0, cmdid=29, nsid=0, flags=0x40, meta=0x0, cmd=(nvme_admin_set_features, fid=0x7, sv=0x0, cdw11=0x70007)
    kworker/0:1H-56      [000] ....   204.197079: nvmet_req_init: nvmet1: qid=0, cmdid=29, nsid=0, flags=0x40, meta=0x0, cmd=(nvme_admin_set_features, fid=0xb, sv=0x0, cdw11=0x900)

Using ',' to separate different field like others in
nvmet_trace_admin_get_features.

Signed-off-by: Hou Pu <houpu.main@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
3 years agonvme: add set feature tracing support
Hou Pu [Mon, 5 Jul 2021 03:15:28 +0000 (11:15 +0800)]
nvme: add set feature tracing support

A nvme connect command produces following trace.

Before:
/sys/kernel/debug/tracing# cat trace | grep feature
    kworker/5:1H-98      [005] ....  3221.294844: nvme_setup_cmd: nvme0: qid=0, cmdid=25, nsid=0, flags=0x0, meta=0x0, cmd=(nvme_admin_set_features cdw10=07 00 00 00 07 00 07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00)
    kworker/4:1H-124     [004] ....  3222.009186: nvme_setup_cmd: nvme0: qid=0, cmdid=17, nsid=0, flags=0x0, meta=0x0, cmd=(nvme_admin_set_features cdw10=0b 00 00 00 00 09 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00)

After:
/sys/kernel/debug/tracing# cat trace | grep feature
    kworker/0:1H-253     [000] ....   196.060509: nvme_setup_cmd: nvme0: qid=0, cmdid=29, nsid=0, flags=0x0, meta=0x0, cmd=(nvme_admin_set_features fid=0x7, sv=0x0, cdw11=0x70007)
    kworker/0:1H-253     [000] ....   196.763947: nvme_setup_cmd: nvme0: qid=0, cmdid=29, nsid=0, flags=0x0, meta=0x0, cmd=(nvme_admin_set_features fid=0xb, sv=0x0, cdw11=0x900)

Using ',' to separate different field like others in
nvmet_trace_admin_get_features.

Signed-off-by: Hou Pu <houpu.main@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
3 years agonvme-fabrics: remove superfluous nvmf_host_put in nvmf_parse_options
Hou Pu [Fri, 9 Jul 2021 02:32:47 +0000 (10:32 +0800)]
nvme-fabrics: remove superfluous nvmf_host_put in nvmf_parse_options

Opts->host is NULL there. It is checked just before. So remove
nvmf_host_put. It is introduced by commit 59a2f3f00fd7 ("nvme: fix
potential memory leak in option parsing").

Signed-off-by: Hou Pu <houpu.main@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
3 years agonvme-pci: cmb sysfs: one file, one value
Keith Busch [Fri, 16 Jul 2021 07:22:49 +0000 (09:22 +0200)]
nvme-pci: cmb sysfs: one file, one value

An attribute should only be exporting one value as recommended in
Documentation/filesystems/sysfs.rst. Implement CMB attributes this way.
The old attribute will remain for backward compatibility.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
3 years agonvme-pci: use attribute group for cmb sysfs
Keith Busch [Wed, 14 Jul 2021 21:02:37 +0000 (14:02 -0700)]
nvme-pci: use attribute group for cmb sysfs

Appending sysfs files to the controller kobject is a bit clunky and
becomes a maintenance problem as more attributes are added. The
attribute group infrastructure handles this better, so use that.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
3 years agonvme: code command_id with a genctr for use-after-free validation
Sagi Grimberg [Wed, 16 Jun 2021 21:19:36 +0000 (14:19 -0700)]
nvme: code command_id with a genctr for use-after-free validation

We cannot detect a (perhaps buggy) controller that is sending us
a completion for a request that was already completed (for example
sending a completion twice), this phenomenon was seen in the wild
a few times.

So to protect against this, we use the upper 4 msbits of the nvme sqe
command_id to use as a 4-bit generation counter and verify it matches
the existing request generation that is incrementing on every execution.

The 16-bit command_id structure now is constructed by:
| xxxx | xxxxxxxxxxxx |
  gen    request tag

This means that we are giving up some possible queue depth as 12 bits
allow for a maximum queue depth of 4095 instead of 65536, however we
never create such long queues anyways so no real harm done.

Suggested-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Acked-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Tested-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
3 years agonvme-tcp: don't check blk_mq_tag_to_rq when receiving pdu data
Sagi Grimberg [Wed, 16 Jun 2021 21:19:35 +0000 (14:19 -0700)]
nvme-tcp: don't check blk_mq_tag_to_rq when receiving pdu data

We already validate it when receiving the c2hdata pdu header
and this is not changing so this is a redundant check.

Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
3 years agonvme-pci: limit maximum queue depth to 4095
Sagi Grimberg [Wed, 16 Jun 2021 21:19:34 +0000 (14:19 -0700)]
nvme-pci: limit maximum queue depth to 4095

We are going to use the upper 4-bits of the command_id for a generation
counter, so enforce the new queue depth upper limit. As we enforce
both min and max queue depth, use param_set_uint_minmax istead of
open coding it.

Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
3 years agoparams: lift param_set_uint_minmax to common code
Sagi Grimberg [Wed, 16 Jun 2021 21:19:33 +0000 (14:19 -0700)]
params: lift param_set_uint_minmax to common code

It is a useful helper hence move it to common code so others can enjoy
it.

Suggested-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
3 years agoremove the lightnvm subsystem
Christoph Hellwig [Thu, 12 Aug 2021 13:23:08 +0000 (15:23 +0200)]
remove the lightnvm subsystem

Lightnvm supports the OCSSD 1.x and 2.0 specs which were early attempts
to produce Open Channel SSDs and never made it into the NVMe spec
proper.  They have since been superceeded by NVMe enhancements such
as ZNS support.  Remove the support per the deprecation schedule.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210812132308.38486-1-hch@lst.de
Reviewed-by: Matias Bjørling <mb@lightnvm.io>
Reviewed-by: Javier González <javier@javigon.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agonbd: reduce the nbd_index_mutex scope
Christoph Hellwig [Wed, 11 Aug 2021 12:44:28 +0000 (14:44 +0200)]
nbd: reduce the nbd_index_mutex scope

nbd_index_mutex is currently held over add_disk and inside ->open, which
leads to lock order reversals.  Refactor the device creation code path
so that nbd_dev_add is called without nbd_index_mutex lock held and
only takes it for the IDR insertation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210811124428.2368491-7-hch@lst.de
[axboe: fix whitespace]
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agonbd: refactor device search and allocation in nbd_genl_connect
Christoph Hellwig [Wed, 11 Aug 2021 12:44:27 +0000 (14:44 +0200)]
nbd: refactor device search and allocation in nbd_genl_connect

Use idr_for_each_entry instead of the awkward callback to find an
existing device for the index == -1 case, and de-duplicate the device
allocation if no existing device was found.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210811124428.2368491-6-hch@lst.de
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agonbd: return the allocated nbd_device from nbd_dev_add
Christoph Hellwig [Wed, 11 Aug 2021 12:44:26 +0000 (14:44 +0200)]
nbd: return the allocated nbd_device from nbd_dev_add

Return the device we just allocated instead of doing an extra search for
it in the caller.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210811124428.2368491-5-hch@lst.de
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agonbd: remove nbd_del_disk
Christoph Hellwig [Wed, 11 Aug 2021 12:44:25 +0000 (14:44 +0200)]
nbd: remove nbd_del_disk

Fold nbd_del_disk and remove the pointless NULL check on ->disk given
that it is always set for a successfully allocated nbd_device structure.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210811124428.2368491-4-hch@lst.de
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agonbd: refactor device removal
Christoph Hellwig [Wed, 11 Aug 2021 12:44:24 +0000 (14:44 +0200)]
nbd: refactor device removal

Share common code for the synchronous and workqueue based device removal,
and remove the pointless use of refcount_dec_and_mutex_lock.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210811124428.2368491-3-hch@lst.de
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agonbd: do del_gendisk() asynchronously for NBD_DESTROY_ON_DISCONNECT
Hou Tao [Wed, 11 Aug 2021 12:44:23 +0000 (14:44 +0200)]
nbd: do del_gendisk() asynchronously for NBD_DESTROY_ON_DISCONNECT

Now open_mutex is used to synchronize partition operations (e.g,
blk_drop_partitions() and blkdev_reread_part()), however it makes
nbd driver broken, because nbd may call del_gendisk() in nbd_release()
or nbd_genl_disconnect() if NBD_CFLAG_DESTROY_ON_DISCONNECT is enabled,
and deadlock occurs, as shown below:

// AB-BA dead-lock
nbd_genl_disconnect            blkdev_open
  nbd_disconnect_and_put
                                 lock bd_mutex
  // last ref
  nbd_put
    lock nbd_index_mutex
      del_gendisk
                                   nbd_open
                                     try lock nbd_index_mutex
        try lock bd_mutex

 or

// AA dead-lock
nbd_release
  lock bd_mutex
    nbd_put
      try lock bd_mutex

Instead of fixing block layer (e.g, introduce another lock), fixing
the nbd driver to call del_gendisk() in a kworker when
NBD_DESTROY_ON_DISCONNECT is enabled. When NBD_DESTROY_ON_DISCONNECT
is disabled, nbd device will always be destroy through module removal,
and there is no risky of deadlock.

To ensure the reuse of nbd index succeeds, moving the calling of
idr_remove() after del_gendisk(), so if the reused index is not found
in nbd_index_idr, the old disk must have been deleted. And reusing
the existing destroy_complete mechanism to ensure nbd_genl_connect()
will wait for the completion of del_gendisk().

Also adding a new workqueue for nbd removal, so nbd_cleanup()
can ensure all removals complete before exits.

Reported-by: syzbot+0fe7752e52337864d29b@syzkaller.appspotmail.com
Fixes: c76f48eb5c08 ("block: take bd_mutex around delete_partitions in del_gendisk")
Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210811124428.2368491-2-hch@lst.de
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agonbd: add the check to prevent overflow in __nbd_ioctl()
Baokun Li [Wed, 4 Aug 2021 02:12:12 +0000 (10:12 +0800)]
nbd: add the check to prevent overflow in __nbd_ioctl()

If user specify a large enough value of NBD blocks option, it may trigger
signed integer overflow which may lead to nbd->config->bytesize becomes a
large or small value, zero in particular.

UBSAN: Undefined behaviour in drivers/block/nbd.c:325:31
signed integer overflow:
1024 * 4611686155866341414 cannot be represented in type 'long long int'
[...]
Call trace:
[...]
 handle_overflow+0x188/0x1dc lib/ubsan.c:192
 __ubsan_handle_mul_overflow+0x34/0x44 lib/ubsan.c:213
 nbd_size_set drivers/block/nbd.c:325 [inline]
 __nbd_ioctl drivers/block/nbd.c:1342 [inline]
 nbd_ioctl+0x998/0xa10 drivers/block/nbd.c:1395
 __blkdev_driver_ioctl block/ioctl.c:311 [inline]
[...]

Although it is not a big deal, still silence the UBSAN by limit
the input value.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Link: https://lore.kernel.org/r/20210804021212.990223-1-libaokun1@huawei.com
[axboe: dropped unlikely()]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoxen-blkfront: Remove redundant assignment to variable err
Colin Ian King [Fri, 6 Aug 2021 11:06:01 +0000 (12:06 +0100)]
xen-blkfront: Remove redundant assignment to variable err

The variable err is being assigned a value that is never read, the
assignment is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20210806110601.11386-1-colin.king@canonical.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock/rnbd: Use sysfs_emit instead of s*printf function for sysfs show
Md Haris Iqbal [Mon, 26 Jul 2021 11:59:50 +0000 (13:59 +0200)]
block/rnbd: Use sysfs_emit instead of s*printf function for sysfs show

sysfs_emit function was added to be aware of the PAGE_SIZE maximum of
the temporary buffer used for outputting sysfs content, so there is no
possible overruns. So replace the uses of any s*printf functions for
the sysfs show functions with sysfs_emit.

Signed-off-by: Md Haris Iqbal <haris.iqbal@ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Link: https://lore.kernel.org/r/20210726115950.470543-3-jinpu.wang@ionos.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock/rnbd-clt: Use put_cpu_ptr after get_cpu_ptr
Gioh Kim [Mon, 26 Jul 2021 11:59:49 +0000 (13:59 +0200)]
block/rnbd-clt: Use put_cpu_ptr after get_cpu_ptr

This patch replaces put_cpu_var with put_cpu_ptr because
get_cpu_ptr should be paired with put_cpu_ptr.

Signed-off-by: Gioh Kim <gi-oh.kim@ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Link: https://lore.kernel.org/r/20210726115950.470543-2-jinpu.wang@ionos.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: remove blk-mq-sysfs dead code
Damien Le Moal [Tue, 13 Jul 2021 08:18:37 +0000 (17:18 +0900)]
block: remove blk-mq-sysfs dead code

In block/blk-mq-sysfs.c, struct blk_mq_ctx_sysfs_entry is not used to
define any attribute since the "mq" sysfs directory contains only
sub-directories (no attribute files). As a result, blk_mq_sysfs_show(),
blk_mq_sysfs_store(), and struct sysfs_ops blk_mq_sysfs_ops are all
unused and unnecessary. Remove all this unused code.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Link: https://lore.kernel.org/r/20210713081837.524422-1-damien.lemoal@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoloop: raise media_change event
Matteo Croce [Mon, 12 Jul 2021 23:05:30 +0000 (01:05 +0200)]
loop: raise media_change event

Make the loop device raise a DISK_MEDIA_CHANGE event on attach or detach.

# udevadm monitor -up |grep -e DISK_MEDIA_CHANGE -e DEVNAME &

# losetup -f zero
[    7.454235] loop0: detected capacity change from 0 to 16384
DISK_MEDIA_CHANGE=1
DEVNAME=/dev/loop0
DEVNAME=/dev/loop0
DEVNAME=/dev/loop0

# losetup -f zero
[   10.205245] loop1: detected capacity change from 0 to 16384
DISK_MEDIA_CHANGE=1
DEVNAME=/dev/loop1
DEVNAME=/dev/loop1
DEVNAME=/dev/loop1

# losetup -f zero2
[   13.532368] loop2: detected capacity change from 0 to 40960
DISK_MEDIA_CHANGE=1
DEVNAME=/dev/loop2
DEVNAME=/dev/loop2

# losetup -D
DEVNAME=/dev/loop1
DISK_MEDIA_CHANGE=1
DEVNAME=/dev/loop1
DEVNAME=/dev/loop2
DISK_MEDIA_CHANGE=1
DEVNAME=/dev/loop2
DEVNAME=/dev/loop0
DISK_MEDIA_CHANGE=1
DEVNAME=/dev/loop0

Signed-off-by: Matteo Croce <mcroce@microsoft.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Luca Boccassi <bluca@debian.org>
Link: https://lore.kernel.org/r/20210712230530.29323-7-mcroce@linux.microsoft.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: add a helper to raise a media changed event
Matteo Croce [Mon, 12 Jul 2021 23:05:29 +0000 (01:05 +0200)]
block: add a helper to raise a media changed event

Refactor disk_check_events() and move some code into disk_event_uevent().
Then add disk_force_media_change(), a helper which will be used by
devices to force issuing a DISK_EVENT_MEDIA_CHANGE event.

Co-developed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Matteo Croce <mcroce@microsoft.com>
Tested-by: Luca Boccassi <bluca@debian.org>
Link: https://lore.kernel.org/r/20210712230530.29323-6-mcroce@linux.microsoft.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: export diskseq in sysfs
Matteo Croce [Mon, 12 Jul 2021 23:05:28 +0000 (01:05 +0200)]
block: export diskseq in sysfs

Add a new sysfs handle to export the new diskseq value.
Place it in <sysfs>/block/<disk>/diskseq and document it.

    $ grep . /sys/class/block/*/diskseq
    /sys/class/block/loop0/diskseq:13
    /sys/class/block/loop1/diskseq:14
    /sys/class/block/loop2/diskseq:5
    /sys/class/block/loop3/diskseq:6
    /sys/class/block/ram0/diskseq:1
    /sys/class/block/ram1/diskseq:2
    /sys/class/block/vda/diskseq:7

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Matteo Croce <mcroce@microsoft.com>
Tested-by: Luca Boccassi <bluca@debian.org>
Link: https://lore.kernel.org/r/20210712230530.29323-5-mcroce@linux.microsoft.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: add ioctl to read the disk sequence number
Matteo Croce [Mon, 12 Jul 2021 23:05:27 +0000 (01:05 +0200)]
block: add ioctl to read the disk sequence number

Add a new BLKGETDISKSEQ ioctl which retrieves the disk sequence number
from the genhd structure.

    # ./getdiskseq /dev/loop*
    /dev/loop0:     13
    /dev/loop0p1:   13
    /dev/loop0p2:   13
    /dev/loop0p3:   13
    /dev/loop1:     14
    /dev/loop1p1:   14
    /dev/loop1p2:   14
    /dev/loop2:     5
    /dev/loop3:     6

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Matteo Croce <mcroce@microsoft.com>
Tested-by: Luca Boccassi <bluca@debian.org>
Link: https://lore.kernel.org/r/20210712230530.29323-4-mcroce@linux.microsoft.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: export the diskseq in uevents
Matteo Croce [Mon, 12 Jul 2021 23:05:26 +0000 (01:05 +0200)]
block: export the diskseq in uevents

Export the newly introduced diskseq in uevents:

    $ udevadm info /sys/class/block/* |grep -e DEVNAME -e DISKSEQ
    E: DEVNAME=/dev/loop0
    E: DISKSEQ=1
    E: DEVNAME=/dev/loop1
    E: DISKSEQ=2
    E: DEVNAME=/dev/loop2
    E: DISKSEQ=3
    E: DEVNAME=/dev/loop3
    E: DISKSEQ=4
    E: DEVNAME=/dev/loop4
    E: DISKSEQ=5
    E: DEVNAME=/dev/loop5
    E: DISKSEQ=6
    E: DEVNAME=/dev/loop6
    E: DISKSEQ=7
    E: DEVNAME=/dev/loop7
    E: DISKSEQ=8
    E: DEVNAME=/dev/nvme0n1
    E: DISKSEQ=9
    E: DEVNAME=/dev/nvme0n1p1
    E: DISKSEQ=9
    E: DEVNAME=/dev/nvme0n1p2
    E: DISKSEQ=9
    E: DEVNAME=/dev/nvme0n1p3
    E: DISKSEQ=9
    E: DEVNAME=/dev/nvme0n1p4
    E: DISKSEQ=9
    E: DEVNAME=/dev/nvme0n1p5
    E: DISKSEQ=9
    E: DEVNAME=/dev/sda
    E: DISKSEQ=10
    E: DEVNAME=/dev/sda1
    E: DISKSEQ=10
    E: DEVNAME=/dev/sda2
    E: DISKSEQ=10

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Matteo Croce <mcroce@microsoft.com>
Tested-by: Luca Boccassi <bluca@debian.org>
Link: https://lore.kernel.org/r/20210712230530.29323-3-mcroce@linux.microsoft.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: add disk sequence number
Matteo Croce [Mon, 12 Jul 2021 23:05:25 +0000 (01:05 +0200)]
block: add disk sequence number

Associating uevents with block devices in userspace is difficult and racy:
the uevent netlink socket is lossy, and on slow and overloaded systems
has a very high latency.
Block devices do not have exclusive owners in userspace, any process can
set one up (e.g. loop devices). Moreover, device names can be reused
(e.g. loop0 can be reused again and again). A userspace process setting
up a block device and watching for its events cannot thus reliably tell
whether an event relates to the device it just set up or another earlier
instance with the same name.

Being able to set a UUID on a loop device would solve the race conditions.
But it does not allow to derive orderings from uevents: if you see a
uevent with a UUID that does not match the device you are waiting for,
you cannot tell whether it's because the right uevent has not arrived yet,
or it was already sent and you missed it. So you cannot tell whether you
should wait for it or not.

Associating a unique, monotonically increasing sequential number to the
lifetime of each block device, which can be retrieved with an ioctl
immediately upon setting it up, allows to solve the race conditions with
uevents, and also allows userspace processes to know whether they should
wait for the uevent they need or if it was dropped and thus they should
move on.

Additionally, increment the disk sequence number when the media change,
i.e. on DISK_EVENT_MEDIA_CHANGE event.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Matteo Croce <mcroce@microsoft.com>
Tested-by: Luca Boccassi <bluca@debian.org>
Link: https://lore.kernel.org/r/20210712230530.29323-2-mcroce@linux.microsoft.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: remove cmdline-parser.c
Christoph Hellwig [Wed, 28 Jul 2021 05:37:56 +0000 (07:37 +0200)]
block: remove cmdline-parser.c

cmdline-parser.c is only used by the cmdline faux partition format,
so merge the code into that and avoid an indirect call.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210728053756.409654-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: remove disk_name()
Christoph Hellwig [Tue, 27 Jul 2021 06:25:18 +0000 (08:25 +0200)]
block: remove disk_name()

Remove the disk_name function now that all users are gone.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210727062518.122108-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: simplify disk name formatting in check_partition
Christoph Hellwig [Tue, 27 Jul 2021 06:25:17 +0000 (08:25 +0200)]
block: simplify disk name formatting in check_partition

disk_name for partition 0 just copies out the disk_name field.  Replace
the call to disk_name with a %s format specifier.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210727062518.122108-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: simplify printing the device names disk_stack_limits
Christoph Hellwig [Tue, 27 Jul 2021 06:25:16 +0000 (08:25 +0200)]
block: simplify printing the device names disk_stack_limits

Printk ->disk_name directly for the disk and use the %pg format specifier
for the block device, which is equivalent to a bdevname call.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210727062518.122108-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: use the %pg format specifier in show_partition
Christoph Hellwig [Tue, 27 Jul 2021 06:25:15 +0000 (08:25 +0200)]
block: use the %pg format specifier in show_partition

Simplify printing the partition name by using the %pg format specifier
that is equivalent to a bdevname call.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210727062518.122108-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: use the %pg format specifier in printk_all_partitions
Christoph Hellwig [Tue, 27 Jul 2021 06:25:14 +0000 (08:25 +0200)]
block: use the %pg format specifier in printk_all_partitions

Simplify printing the partition name by using the %pg format specifier
that is equivalent to a bdevname call.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210727062518.122108-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: reduce stack usage in diskstats_show
Abd-Alrhman Masalkhi [Tue, 27 Jul 2021 06:25:13 +0000 (08:25 +0200)]
block: reduce stack usage in diskstats_show

I have compiled the kernel with a cross compiler "hppa-linux-gnu-" v9.3.0
on x86-64 host machine. I got the following warning:

block/genhd.c: In function ‘diskstats_show’:
block/genhd.c:1227:1: warning: the frame size of 1688 bytes is larger
than 1280 bytes [-Wframe-larger-than=]
 1227  |  }

By Reduced the stack footprint by using the %pg printk specifier instead
of disk_name to remove the need for the on-stack buffer.

Signed-off-by: Abd-Alrhman Masalkhi <abd.masalkhi@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210727062518.122108-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: remove bdput
Christoph Hellwig [Thu, 22 Jul 2021 07:54:02 +0000 (09:54 +0200)]
block: remove bdput

Now that we've stopped using inode references for anything meaninful
in the block layer get rid of the helper to put it and just open code
the call to iput on the block_device inode.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Chaitanya Kulkarni <ckulkarnilinux@gmail.com>
Link: https://lore.kernel.org/r/20210722075402.983367-10-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: remove bdgrab
Christoph Hellwig [Thu, 22 Jul 2021 07:54:01 +0000 (09:54 +0200)]
block: remove bdgrab

All callers are gone, and no one should grab a pure inode reference to
a block device anymore.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Link: https://lore.kernel.org/r/20210722075402.983367-9-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoloop: don't grab a reference to the block device
Christoph Hellwig [Thu, 22 Jul 2021 07:54:00 +0000 (09:54 +0200)]
loop: don't grab a reference to the block device

The whole device block device won't be removed while the disk is still
alive, so don't bother to grab a reference to it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Ming Lei <ming.lei@rehat.com>
Reviewed-by: Chaitanya Kulkarni <ckulkarnilinux@gmail.com>
Link: https://lore.kernel.org/r/20210722075402.983367-8-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: change the refcounting for partitions
Christoph Hellwig [Thu, 22 Jul 2021 07:53:58 +0000 (09:53 +0200)]
block: change the refcounting for partitions

Instead of acquiring an inode reference on open make sure partitions
always hold device model references to the disk while alive, and switch
open to grab only a device model reference to the opened block device.
If that is a partition the disk reference is transitively held by the
partition already.

Link: https://lore.kernel.org/r/20210722075402.983367-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: allocate bd_meta_info later in add_partitions
Christoph Hellwig [Thu, 22 Jul 2021 07:53:57 +0000 (09:53 +0200)]
block: allocate bd_meta_info later in add_partitions

Move the allocation of bd_meta_info after initializing the struct device
to avoid the special bdput error handling path.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20210722075402.983367-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: unhash the whole device inode earlier
Christoph Hellwig [Thu, 22 Jul 2021 07:53:56 +0000 (09:53 +0200)]
block: unhash the whole device inode earlier

Unhash the whole device inode early in del_gendisk.  This allows to
remove the first GENHD_FL_UP check in the open path as we simply
won't find a just removed inode.  The second non-racy check after
taking open_mutex is still kept.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210722075402.983367-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: assert the locking state in delete_partition
Christoph Hellwig [Thu, 22 Jul 2021 07:53:55 +0000 (09:53 +0200)]
block: assert the locking state in delete_partition

Add a lockdep assert instead of the outdated locking comment.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Chaitanya Kulkarni <ckulkarnilinux@gmail.com>
Link: https://lore.kernel.org/r/20210722075402.983367-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: use bvec_kmap_local in bio_integrity_process
Christoph Hellwig [Tue, 27 Jul 2021 05:56:46 +0000 (07:56 +0200)]
block: use bvec_kmap_local in bio_integrity_process

Using local kmaps slightly reduces the chances to stray writes, and
the bvec interface cleans up the code a little bit.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210727055646.118787-16-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: use bvec_kmap_local in t10_pi_type1_{prepare,complete}
Christoph Hellwig [Tue, 27 Jul 2021 05:56:45 +0000 (07:56 +0200)]
block: use bvec_kmap_local in t10_pi_type1_{prepare,complete}

Using local kmaps slightly reduces the chances to stray writes, and
the bvec interface cleans up the code a little bit.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210727055646.118787-15-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: use memcpy_from_bvec in __blk_queue_bounce
Christoph Hellwig [Tue, 27 Jul 2021 05:56:44 +0000 (07:56 +0200)]
block: use memcpy_from_bvec in __blk_queue_bounce

Rewrite the actual bounce buffering loop in __blk_queue_bounce to that
the memcpy_to_bvec helper can be used to perform the data copies.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210727055646.118787-14-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: use memcpy_from_bvec in bio_copy_kern_endio_read
Christoph Hellwig [Tue, 27 Jul 2021 05:56:43 +0000 (07:56 +0200)]
block: use memcpy_from_bvec in bio_copy_kern_endio_read

Use memcpy_from_bvec instead of open coding the logic.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210727055646.118787-13-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: use memcpy_to_bvec in copy_to_high_bio_irq
Christoph Hellwig [Tue, 27 Jul 2021 05:56:42 +0000 (07:56 +0200)]
block: use memcpy_to_bvec in copy_to_high_bio_irq

Use memcpy_to_bvec instead of opencoding the logic.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210727055646.118787-12-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: rewrite bio_copy_data_iter to use bvec_kmap_local and memcpy_to_bvec
Christoph Hellwig [Tue, 27 Jul 2021 05:56:41 +0000 (07:56 +0200)]
block: rewrite bio_copy_data_iter to use bvec_kmap_local and memcpy_to_bvec

Use the proper helpers instead of open coding the copy.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210727055646.118787-11-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: remove bvec_kmap_irq and bvec_kunmap_irq
Christoph Hellwig [Tue, 27 Jul 2021 05:56:40 +0000 (07:56 +0200)]
block: remove bvec_kmap_irq and bvec_kunmap_irq

These two helpers are entirely unused now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210727055646.118787-10-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agops3disk: use memcpy_{from,to}_bvec
Christoph Hellwig [Tue, 27 Jul 2021 05:56:39 +0000 (07:56 +0200)]
ps3disk: use memcpy_{from,to}_bvec

Use the bvec helpers instead of open coding the copy.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Tested-by: Geoff Levand <geoff@infradead.org>
Link: https://lore.kernel.org/r/20210727055646.118787-9-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agodm-writecache: use bvec_kmap_local instead of bvec_kmap_irq
Christoph Hellwig [Tue, 27 Jul 2021 05:56:38 +0000 (07:56 +0200)]
dm-writecache: use bvec_kmap_local instead of bvec_kmap_irq

There is no need to disable interrupts in bio_copy_block, and the local
only mappings helps to avoid any sort of problems with stray writes
into the bio data.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20210727055646.118787-8-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agorbd: use memzero_bvec
Christoph Hellwig [Tue, 27 Jul 2021 05:56:37 +0000 (07:56 +0200)]
rbd: use memzero_bvec

Use memzero_bvec instead of reimplementing it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20210727055646.118787-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: use memzero_page in zero_fill_bio
Christoph Hellwig [Tue, 27 Jul 2021 05:56:36 +0000 (07:56 +0200)]
block: use memzero_page in zero_fill_bio

Use memzero_bvec to zero each segment in the bio instead of manually
mapping and zeroing the data.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20210727055646.118787-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agobvec: add memcpy_{from,to}_bvec and memzero_bvec helper
Christoph Hellwig [Tue, 27 Jul 2021 05:56:35 +0000 (07:56 +0200)]
bvec: add memcpy_{from,to}_bvec and memzero_bvec helper

Add helpers to perform common memory operation on a bvec.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20210727055646.118787-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agobvec: add a bvec_kmap_local helper
Christoph Hellwig [Tue, 27 Jul 2021 05:56:34 +0000 (07:56 +0200)]
bvec: add a bvec_kmap_local helper

Add a helper to call kmap_local_page on a bvec.  There is no need for
an unmap helper given that kunmap_local accept any address in the mapped
page.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20210727055646.118787-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agobvec: fix the include guards for bvec.h
Christoph Hellwig [Tue, 27 Jul 2021 05:56:33 +0000 (07:56 +0200)]
bvec: fix the include guards for bvec.h

Fix the include guards to match the file naming.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20210727055646.118787-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoMIPS: don't include <linux/genhd.h> in <asm/mach-rc32434/rb.h>
Christoph Hellwig [Tue, 27 Jul 2021 05:56:32 +0000 (07:56 +0200)]
MIPS: don't include <linux/genhd.h> in <asm/mach-rc32434/rb.h>

There is no need to include genhd.h from a random arch header, and not
doing so prevents the possibility for nasty include loops.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20210727055646.118787-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoioprio: move user space relevant ioprio bits to UAPI includes
Oliver Hartkopp [Wed, 14 Jul 2021 19:56:55 +0000 (21:56 +0200)]
ioprio: move user space relevant ioprio bits to UAPI includes

systemd added a modified copy of include/linux/ioprio.h into its
code to get the relevant content definitions for the exposed
ioprio_[get|set] system calls.

Move the user space relevant ioprio bits to the UAPI includes to be
able to use the ioprio_[get|set] syscalls as intended.

Cc: Kay Sievers <kay@vrfy.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Link: https://lore.kernel.org/r/20210714195655.181943-1-socketcan@hartkopp.net
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoLinux 5.14-rc4
Linus Torvalds [Mon, 2 Aug 2021 00:04:17 +0000 (17:04 -0700)]
Linux 5.14-rc4

3 years agoMerge tag 'perf-tools-fixes-for-v5.14-2021-08-01' of git://git.kernel.org/pub/scm...
Linus Torvalds [Sun, 1 Aug 2021 19:25:30 +0000 (12:25 -0700)]
Merge tag 'perf-tools-fixes-for-v5.14-2021-08-01' of git://git./linux/kernel/git/acme/linux

Pull perf tools fixes from Arnaldo Carvalho de Melo:

 - Revert "perf map: Fix dso->nsinfo refcounting", this makes 'perf top'
   abort, uncovering a design flaw on how namespace information is kept.
   The fix for that is more than we can do right now, leave it for the
   next merge window.

 - Split --dump-raw-trace by AUX records for ARM's CoreSight, fixing up
   the decoding of some records.

 - Fix PMU alias matching.

Thanks to James Clark and John Garry for these fixes.

* tag 'perf-tools-fixes-for-v5.14-2021-08-01' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux:
  Revert "perf map: Fix dso->nsinfo refcounting"
  perf pmu: Fix alias matching
  perf cs-etm: Split --dump-raw-trace by AUX records

3 years agoMerge tag 'powerpc-5.14-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
Linus Torvalds [Sun, 1 Aug 2021 19:18:44 +0000 (12:18 -0700)]
Merge tag 'powerpc-5.14-4' of git://git./linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:

 - Don't use r30 in VDSO code, to avoid breaking existing Go lang
   programs.

 - Change an export symbol to allow non-GPL modules to use spinlocks
   again.

Thanks to Paul Menzel, and Srikar Dronamraju.

* tag 'powerpc-5.14-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/vdso: Don't use r30 to avoid breaking Go lang
  powerpc/pseries: Fix regression while building external modules

3 years agoMerge tag 'xfs-5.14-fixes-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Linus Torvalds [Sun, 1 Aug 2021 19:07:23 +0000 (12:07 -0700)]
Merge tag 'xfs-5.14-fixes-2' of git://git./fs/xfs/xfs-linux

Pull xfs fixes from Darrick Wong:
 "This contains a bunch of bug fixes in XFS.

  Dave and I have been busy the last couple of weeks to find and fix as
  many log recovery bugs as we can find; here are the results so far. Go
  fstests -g recoveryloop! ;)

   - Fix a number of coordination bugs relating to cache flushes for
     metadata writeback, cache flushes for multi-buffer log writes, and
     FUA writes for single-buffer log writes

   - Fix a bug with incorrect replay of attr3 blocks

   - Fix unnecessary stalls when flushing logs to disk

   - Fix spoofing problems when recovering realtime bitmap blocks"

* tag 'xfs-5.14-fixes-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  xfs: prevent spoofing of rtbitmap blocks when recovering buffers
  xfs: limit iclog tail updates
  xfs: need to see iclog flags in tracing
  xfs: Enforce attr3 buffer recovery order
  xfs: logging the on disk inode LSN can make it go backwards
  xfs: avoid unnecessary waits in xfs_log_force_lsn()
  xfs: log forces imply data device cache flushes
  xfs: factor out forced iclog flushes
  xfs: fix ordering violation between cache flushes and tail updates
  xfs: fold __xlog_state_release_iclog into xlog_state_release_iclog
  xfs: external logs need to flush data device
  xfs: flush data dev on external log write

3 years agoMerge tag '5.14-rc3-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6
Linus Torvalds [Sat, 31 Jul 2021 16:25:12 +0000 (09:25 -0700)]
Merge tag '5.14-rc3-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull cifs fixes from Steve French:
 "Three cifs/smb3 fixes, including two for stable, and a fix for an
  fallocate problem noticed by Clang"

* tag '5.14-rc3-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: add missing parsing of backupuid
  smb3: rc uninitialized in one fallocate path
  SMB3: fix readpage for large swap cache

3 years agoMerge tag 'net-5.14-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Linus Torvalds [Fri, 30 Jul 2021 23:01:36 +0000 (16:01 -0700)]
Merge tag 'net-5.14-rc4' of git://git./linux/kernel/git/netdev/net

Pull networking fixes from Jakub Kicinski:
 "Networking fixes for 5.14-rc4, including fixes from bpf, can, WiFi
  (mac80211) and netfilter trees.

  Current release - regressions:

   - mac80211: fix starting aggregation sessions on mesh interfaces

  Current release - new code bugs:

   - sctp: send pmtu probe only if packet loss in Search Complete state

   - bnxt_en: add missing periodic PHC overflow check

   - devlink: fix phys_port_name of virtual port and merge error

   - hns3: change the method of obtaining default ptp cycle

   - can: mcba_usb_start(): add missing urb->transfer_dma initialization

  Previous releases - regressions:

   - set true network header for ECN decapsulation

   - mlx5e: RX, avoid possible data corruption w/ relaxed ordering and
     LRO

   - phy: re-add check for PHY_BRCM_DIS_TXCRXC_NOENRGY on the BCM54811
     PHY

   - sctp: fix return value check in __sctp_rcv_asconf_lookup

  Previous releases - always broken:

   - bpf:
       - more spectre corner case fixes, introduce a BPF nospec
         instruction for mitigating Spectre v4
       - fix OOB read when printing XDP link fdinfo
       - sockmap: fix cleanup related races

   - mac80211: fix enabling 4-address mode on a sta vif after assoc

   - can:
       - raw: raw_setsockopt(): fix raw_rcv panic for sock UAF
       - j1939: j1939_session_deactivate(): clarify lifetime of session
         object, avoid UAF
       - fix number of identical memory leaks in USB drivers

   - tipc:
       - do not blindly write skb_shinfo frags when doing decryption
       - fix sleeping in tipc accept routine"

* tag 'net-5.14-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (91 commits)
  gve: Update MAINTAINERS list
  can: esd_usb2: fix memory leak
  can: ems_usb: fix memory leak
  can: usb_8dev: fix memory leak
  can: mcba_usb_start(): add missing urb->transfer_dma initialization
  can: hi311x: fix a signedness bug in hi3110_cmd()
  MAINTAINERS: add Yasushi SHOJI as reviewer for the Microchip CAN BUS Analyzer Tool driver
  bpf: Fix leakage due to insufficient speculative store bypass mitigation
  bpf: Introduce BPF nospec instruction for mitigating Spectre v4
  sis900: Fix missing pci_disable_device() in probe and remove
  net: let flow have same hash in two directions
  nfc: nfcsim: fix use after free during module unload
  tulip: windbond-840: Fix missing pci_disable_device() in probe and remove
  sctp: fix return value check in __sctp_rcv_asconf_lookup
  nfc: s3fwrn5: fix undefined parameter values in dev_err()
  net/mlx5: Fix mlx5_vport_tbl_attr chain from u16 to u32
  net/mlx5e: Fix nullptr in mlx5e_hairpin_get_mdev()
  net/mlx5: Unload device upon firmware fatal error
  net/mlx5e: Fix page allocation failure for ptp-RQ over SF
  net/mlx5e: Fix page allocation failure for trap-RQ over SF
  ...

3 years agoMerge tag 'acpi-5.14-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
Linus Torvalds [Fri, 30 Jul 2021 22:56:24 +0000 (15:56 -0700)]
Merge tag 'acpi-5.14-rc4' of git://git./linux/kernel/git/rafael/linux-pm

Pull ACPI fixes from Rafael Wysocki:
 "These revert a recent IRQ resources handling modification that turned
  out to be problematic, fix suspend-to-idle handling on AMD platforms
  to take upcoming systems into account properly and fix the retrieval
  of the DPTF attributes of the PCH FIVR.

  Specifics:

   - Revert recent change of the ACPI IRQ resources handling that
     attempted to improve the ACPI IRQ override selection logic, but
     introduced serious regressions on some systems (Hui Wang).

   - Fix up quirks for AMD platforms in the suspend-to-idle support code
     so as to take upcoming systems using uPEP HID AMDI007 into account
     as appropriate (Mario Limonciello).

   - Fix the code retrieving DPTF attributes of the PCH FIVR so that it
     agrees on the return data type with the ACPI control method
     evaluated for this purpose (Srinivas Pandruvada)"

* tag 'acpi-5.14-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: DPTF: Fix reading of attributes
  Revert "ACPI: resources: Add checks for ACPI IRQ override"
  ACPI: PM: Add support for upcoming AMD uPEP HID AMDI007

3 years agopipe: make pipe writes always wake up readers
Linus Torvalds [Fri, 30 Jul 2021 22:42:34 +0000 (15:42 -0700)]
pipe: make pipe writes always wake up readers

Since commit 1b6b26ae7053 ("pipe: fix and clarify pipe write wakeup
logic") we have sanitized the pipe write logic, and would only try to
wake up readers if they needed it.

In particular, if the pipe already had data in it before the write,
there was no point in trying to wake up a reader, since any existing
readers must have been aware of the pre-existing data already.  Doing
extraneous wakeups will only cause potential thundering herd problems.

However, it turns out that some Android libraries have misused the EPOLL
interface, and expected "edge triggered" be to "any new write will
trigger it".  Even if there was no edge in sight.

Quoting Sandeep Patil:
 "The commit 1b6b26ae7053 ('pipe: fix and clarify pipe write wakeup
  logic') changed pipe write logic to wakeup readers only if the pipe
  was empty at the time of write. However, there are libraries that
  relied upon the older behavior for notification scheme similar to
  what's described in [1]

  One such library 'realm-core'[2] is used by numerous Android
  applications. The library uses a similar notification mechanism as GNU
  Make but it never drains the pipe until it is full. When Android moved
  to v5.10 kernel, all applications using this library stopped working.

  The library has since been fixed[3] but it will be a while before all
  applications incorporate the updated library"

Our regression rule for the kernel is that if applications break from
new behavior, it's a regression, even if it was because the application
did something patently wrong.  Also note the original report [4] by
Michal Kerrisk about a test for this epoll behavior - but at that point
we didn't know of any actual broken use case.

So add the extraneous wakeup, to approximate the old behavior.

[ I say "approximate", because the exact old behavior was to do a wakeup
  not for each write(), but for each pipe buffer chunk that was filled
  in. The behavior introduced by this change is not that - this is just
  "every write will cause a wakeup, whether necessary or not", which
  seems to be sufficient for the broken library use. ]

It's worth noting that this adds the extraneous wakeup only for the
write side, while the read side still considers the "edge" to be purely
about reading enough from the pipe to allow further writes.

See commit f467a6a66419 ("pipe: fix and clarify pipe read wakeup logic")
for the pipe read case, which remains that "only wake up if the pipe was
full, and we read something from it".

Link: https://lore.kernel.org/lkml/CAHk-=wjeG0q1vgzu4iJhW5juPkTsjTYmiqiMUYAebWW+0bam6w@mail.gmail.com/
Link: https://github.com/realm/realm-core
Link: https://github.com/realm/realm-core/issues/4666
Link: https://lore.kernel.org/lkml/CAKgNAkjMBGeAwF=2MKK758BhxvW58wYTgYKB2V-gY1PwXxrH+Q@mail.gmail.com/
Link: https://lore.kernel.org/lkml/20210729222635.2937453-1-sspatil@android.com/
Reported-by: Sandeep Patil <sspatil@android.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agoRevert "perf map: Fix dso->nsinfo refcounting"
Arnaldo Carvalho de Melo [Fri, 30 Jul 2021 21:26:22 +0000 (18:26 -0300)]
Revert "perf map: Fix dso->nsinfo refcounting"

This makes 'perf top' abort in some cases, and the right fix will
involve surgery that is too much to do at this stage, so revert for now
and fix it in the next merge window.

This reverts commit 2d6b74baa7147251c30a46c4996e8cc224aa2dc5.

Cc: Riccardo Mancini <rickyman7@gmail.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Krister Johansen <kjlx@templeofstupid.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
3 years agoMerge branches 'acpi-resources' and 'acpi-dptf'
Rafael J. Wysocki [Fri, 30 Jul 2021 18:26:38 +0000 (20:26 +0200)]
Merge branches 'acpi-resources' and 'acpi-dptf'

* acpi-resources:
  Revert "ACPI: resources: Add checks for ACPI IRQ override"

* acpi-dptf:
  ACPI: DPTF: Fix reading of attributes

3 years agoMerge tag 'block-5.14-2021-07-30' of git://git.kernel.dk/linux-block
Linus Torvalds [Fri, 30 Jul 2021 18:08:12 +0000 (11:08 -0700)]
Merge tag 'block-5.14-2021-07-30' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:

 - gendisk freeing fix (Christoph)

 - blk-iocost wake ordering fix (Tejun)

 - tag allocation error handling fix (John)

 - loop locking fix. While this isn't the prettiest fix in the world,
   nobody has any good alternatives for 5.14. Something to likely
   revisit for 5.15. (Tetsuo)

* tag 'block-5.14-2021-07-30' of git://git.kernel.dk/linux-block:
  block: delay freeing the gendisk
  blk-iocost: fix operation ordering in iocg_wake_fn()
  blk-mq-sched: Fix blk_mq_sched_alloc_tags() error handling
  loop: reintroduce global lock for safe loop_validate_file() traversal

3 years agoMerge tag 'io_uring-5.14-2021-07-30' of git://git.kernel.dk/linux-block
Linus Torvalds [Fri, 30 Jul 2021 18:01:47 +0000 (11:01 -0700)]
Merge tag 'io_uring-5.14-2021-07-30' of git://git.kernel.dk/linux-block

Pull io_uring fixes from Jens Axboe:

 - A fix for block backed reissue (me)

 - Reissue context hardening (me)

 - Async link locking fix (Pavel)

* tag 'io_uring-5.14-2021-07-30' of git://git.kernel.dk/linux-block:
  io_uring: fix poll requests leaking second poll entries
  io_uring: don't block level reissue off completion path
  io_uring: always reissue from task_work context
  io_uring: fix race in unified task_work running
  io_uring: fix io_prep_async_link locking

3 years agoMerge tag 'libata-5.14-2021-07-30' of git://git.kernel.dk/linux-block
Linus Torvalds [Fri, 30 Jul 2021 17:56:47 +0000 (10:56 -0700)]
Merge tag 'libata-5.14-2021-07-30' of git://git.kernel.dk/linux-block

Pull libata fixlets from Jens Axboe:

 - A fix for PIO highmem (Christoph)

 - Kill HAVE_IDE as it's now unused (Lukas)

* tag 'libata-5.14-2021-07-30' of git://git.kernel.dk/linux-block:
  arch: Kconfig: clean up obsolete use of HAVE_IDE
  libata: fix ata_pio_sector for CONFIG_HIGHMEM

3 years agoMerge tag 'for-5.14-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...
Linus Torvalds [Fri, 30 Jul 2021 17:50:09 +0000 (10:50 -0700)]
Merge tag 'for-5.14-rc3-tag' of git://git./linux/kernel/git/kdave/linux

Pull btrfs fixes from David Sterba:

 - fix -Warray-bounds warning, to help external patchset to make it
   default treewide

 - fix writeable device accounting (syzbot report)

 - fix fsync and log replay after a rename and inode eviction

 - fix potentially lost error code when submitting multiple bios for
   compressed range

* tag 'for-5.14-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: calculate number of eb pages properly in csum_tree_block
  btrfs: fix rw device counting in __btrfs_free_extra_devids
  btrfs: fix lost inode on log replay after mix of fsync, rename and inode eviction
  btrfs: mark compressed range uptodate only if all bio succeed

3 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid
Linus Torvalds [Fri, 30 Jul 2021 17:36:36 +0000 (10:36 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/hid/hid

Pull HID fixes from Jiri Kosina:

 - resume timing fix for intel-ish driver (Ye Xiang)

 - fix for using incorrect MMIO register in amd_sfh driver (Dylan
   MacKenzie)

 - Cintiq 24HDT / 27QHDT regression fix and touch processing fix for
   Wacom driver (Jason Gerecke)

 - device removal bugfix for ft260 driver (Michael Zaidman)

 - other small assorted fixes

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid:
  HID: ft260: fix device removal due to USB disconnect
  HID: wacom: Skip processing of touches with negative slot values
  HID: wacom: Re-enable touch by default for Cintiq 24HDT / 27QHDT
  HID: Kconfig: Fix spelling mistake "Uninterruptable" -> "Uninterruptible"
  HID: apple: Add support for Keychron K1 wireless keyboard
  HID: fix typo in Kconfig
  HID: ft260: fix format type warning in ft260_word_show()
  HID: amd_sfh: Use correct MMIO register for DMA address
  HID: asus: Remove check for same LED brightness on set
  HID: intel-ish-hid: use async resume function

3 years agoMerge branch 'akpm' (patches from Andrew)
Linus Torvalds [Fri, 30 Jul 2021 17:29:58 +0000 (10:29 -0700)]
Merge branch 'akpm' (patches from Andrew)

Merge misc fixes from Andrew Morton:
 "7 patches.

  Subsystems affected by this patch series: lib, ocfs2, and mm (slub,
  migration, and memcg)"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  mm/memcg: fix NULL pointer dereference in memcg_slab_free_hook()
  slub: fix unreclaimable slab stat for bulk free
  mm/migrate: fix NR_ISOLATED corruption on 64-bit
  mm: memcontrol: fix blocking rstat function called from atomic cgroup1 thresholding code
  ocfs2: issue zeroout to EOF blocks
  ocfs2: fix zero out valid data
  lib/test_string.c: move string selftest in the Runtime Testing menu

3 years agoMerge tag 'linux-can-fixes-for-5.14-20210730' of git://git.kernel.org/pub/scm/linux...
Jakub Kicinski [Fri, 30 Jul 2021 17:29:52 +0000 (19:29 +0200)]
Merge tag 'linux-can-fixes-for-5.14-20210730' of git://git./linux/kernel/git/mkl/linux-can

Marc Kleine-Budde says:

====================
pull-request: can 2021-07-30

The first patch is by me and adds Yasushi SHOJI as a reviewer for the
Microchip CAN BUS Analyzer Tool driver.

Dan Carpenter's patch fixes a signedness bug in the hi311x driver.

Pavel Skripkin provides 4 patches, the first targets the mcba_usb
driver by adding the missing urb->transfer_dma initialization, which
was broken in a previous commit. The last 3 patches fix a memory leak
in the usb_8dev, ems_usb and esd_usb2 driver.

* tag 'linux-can-fixes-for-5.14-20210730' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can:
  can: esd_usb2: fix memory leak
  can: ems_usb: fix memory leak
  can: usb_8dev: fix memory leak
  can: mcba_usb_start(): add missing urb->transfer_dma initialization
  can: hi311x: fix a signedness bug in hi3110_cmd()
  MAINTAINERS: add Yasushi SHOJI as reviewer for the Microchip CAN BUS Analyzer Tool driver
====================

Link: https://lore.kernel.org/r/20210730070526.1699867-1-mkl@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
3 years agomm/memcg: fix NULL pointer dereference in memcg_slab_free_hook()
Wang Hai [Thu, 29 Jul 2021 21:53:54 +0000 (14:53 -0700)]
mm/memcg: fix NULL pointer dereference in memcg_slab_free_hook()

When I use kfree_rcu() to free a large memory allocated by kmalloc_node(),
the following dump occurs.

  BUG: kernel NULL pointer dereference, address: 0000000000000020
  [...]
  Oops: 0000 [#1] SMP
  [...]
  Workqueue: events kfree_rcu_work
  RIP: 0010:__obj_to_index include/linux/slub_def.h:182 [inline]
  RIP: 0010:obj_to_index include/linux/slub_def.h:191 [inline]
  RIP: 0010:memcg_slab_free_hook+0x120/0x260 mm/slab.h:363
  [...]
  Call Trace:
    kmem_cache_free_bulk+0x58/0x630 mm/slub.c:3293
    kfree_bulk include/linux/slab.h:413 [inline]
    kfree_rcu_work+0x1ab/0x200 kernel/rcu/tree.c:3300
    process_one_work+0x207/0x530 kernel/workqueue.c:2276
    worker_thread+0x320/0x610 kernel/workqueue.c:2422
    kthread+0x13d/0x160 kernel/kthread.c:313
    ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

When kmalloc_node() a large memory, page is allocated, not slab, so when
freeing memory via kfree_rcu(), this large memory should not be used by
memcg_slab_free_hook(), because memcg_slab_free_hook() is is used for
slab.

Using page_objcgs_check() instead of page_objcgs() in
memcg_slab_free_hook() to fix this bug.

Link: https://lkml.kernel.org/r/20210728145655.274476-1-wanghai38@huawei.com
Fixes: 270c6a71460e ("mm: memcontrol/slab: Use helpers to access slab page's memcg_data")
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Roman Gushchin <guro@fb.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agoslub: fix unreclaimable slab stat for bulk free
Shakeel Butt [Thu, 29 Jul 2021 21:53:50 +0000 (14:53 -0700)]
slub: fix unreclaimable slab stat for bulk free

SLUB uses page allocator for higher order allocations and update
unreclaimable slab stat for such allocations.  At the moment, the bulk
free for SLUB does not share code with normal free code path for these
type of allocations and have missed the stat update.  So, fix the stat
update by common code.  The user visible impact of the bug is the
potential of inconsistent unreclaimable slab stat visible through
meminfo and vmstat.

Link: https://lkml.kernel.org/r/20210728155354.3440560-1-shakeelb@google.com
Fixes: 6a486c0ad4dc ("mm, sl[ou]b: improve memory accounting")
Signed-off-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Roman Gushchin <guro@fb.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agomm/migrate: fix NR_ISOLATED corruption on 64-bit
Aneesh Kumar K.V [Thu, 29 Jul 2021 21:53:47 +0000 (14:53 -0700)]
mm/migrate: fix NR_ISOLATED corruption on 64-bit

Similar to commit 2da9f6305f30 ("mm/vmscan: fix NR_ISOLATED_FILE
corruption on 64-bit") avoid using unsigned int for nr_pages.  With
unsigned int type the large unsigned int converts to a large positive
signed long.

Symptoms include CMA allocations hanging forever due to
alloc_contig_range->...->isolate_migratepages_block waiting forever in
"while (unlikely(too_many_isolated(pgdat)))".

Link: https://lkml.kernel.org/r/20210728042531.359409-1-aneesh.kumar@linux.ibm.com
Fixes: c5fc5c3ae0c8 ("mm: migrate: account THP NUMA migration counters correctly")
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reported-by: Michael Ellerman <mpe@ellerman.id.au>
Reported-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agomm: memcontrol: fix blocking rstat function called from atomic cgroup1 thresholding...
Johannes Weiner [Thu, 29 Jul 2021 21:53:44 +0000 (14:53 -0700)]
mm: memcontrol: fix blocking rstat function called from atomic cgroup1 thresholding code

Dan Carpenter reports:

    The patch 2d146aa3aa84: "mm: memcontrol: switch to rstat" from Apr
    29, 2021, leads to the following static checker warning:

    kernel/cgroup/rstat.c:200 cgroup_rstat_flush()
    warn: sleeping in atomic context

    mm/memcontrol.c
      3572  static unsigned long mem_cgroup_usage(struct mem_cgroup *memcg, bool swap)
      3573  {
      3574          unsigned long val;
      3575
      3576          if (mem_cgroup_is_root(memcg)) {
      3577                  cgroup_rstat_flush(memcg->css.cgroup);
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

    This is from static analysis and potentially a false positive.  The
    problem is that mem_cgroup_usage() is called from __mem_cgroup_threshold()
    which holds an rcu_read_lock().  And the cgroup_rstat_flush() function
    can sleep.

      3578                  val = memcg_page_state(memcg, NR_FILE_PAGES) +
      3579                          memcg_page_state(memcg, NR_ANON_MAPPED);
      3580                  if (swap)
      3581                          val += memcg_page_state(memcg, MEMCG_SWAP);
      3582          } else {
      3583                  if (!swap)
      3584                          val = page_counter_read(&memcg->memory);
      3585                  else
      3586                          val = page_counter_read(&memcg->memsw);
      3587          }
      3588          return val;
      3589  }

__mem_cgroup_threshold() indeed holds the rcu lock.  In addition, the
thresholding code is invoked during stat changes, and those contexts
have irqs disabled as well.  If the lock breaking occurs inside the
flush function, it will result in a sleep from an atomic context.

Use the irqsafe flushing variant in mem_cgroup_usage() to fix this.

Link: https://lkml.kernel.org/r/20210726150019.251820-1-hannes@cmpxchg.org
Fixes: 2d146aa3aa84 ("mm: memcontrol: switch to rstat")
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Chris Down <chris@chrisdown.name>
Reviewed-by: Rik van Riel <riel@surriel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agoocfs2: issue zeroout to EOF blocks
Junxiao Bi [Thu, 29 Jul 2021 21:53:41 +0000 (14:53 -0700)]
ocfs2: issue zeroout to EOF blocks

For punch holes in EOF blocks, fallocate used buffer write to zero the
EOF blocks in last cluster.  But since ->writepage will ignore EOF
pages, those zeros will not be flushed.

This "looks" ok as commit 6bba4471f0cc ("ocfs2: fix data corruption by
fallocate") will zero the EOF blocks when extend the file size, but it
isn't.  The problem happened on those EOF pages, before writeback, those
pages had DIRTY flag set and all buffer_head in them also had DIRTY flag
set, when writeback run by write_cache_pages(), DIRTY flag on the page
was cleared, but DIRTY flag on the buffer_head not.

When next write happened to those EOF pages, since buffer_head already
had DIRTY flag set, it would not mark page DIRTY again.  That made
writeback ignore them forever.  That will cause data corruption.  Even
directio write can't work because it will fail when trying to drop pages
caches before direct io, as it found the buffer_head for those pages
still had DIRTY flag set, then it will fall back to buffer io mode.

To make a summary of the issue, as writeback ingores EOF pages, once any
EOF page is generated, any write to it will only go to the page cache,
it will never be flushed to disk even file size extends and that page is
not EOF page any more.  The fix is to avoid zero EOF blocks with buffer
write.

The following code snippet from qemu-img could trigger the corruption.

  656   open("6b3711ae-3306-4bdd-823c-cf1c0060a095.conv.2", O_RDWR|O_DIRECT|O_CLOEXEC) = 11
  ...
  660   fallocate(11, FALLOC_FL_KEEP_SIZE|FALLOC_FL_PUNCH_HOLE, 2275868672, 327680 <unfinished ...>
  660   fallocate(11, 0, 2275868672, 327680) = 0
  658   pwrite64(11, "

Link: https://lkml.kernel.org/r/20210722054923.24389-2-junxiao.bi@oracle.com
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agoocfs2: fix zero out valid data
Junxiao Bi [Thu, 29 Jul 2021 21:53:38 +0000 (14:53 -0700)]
ocfs2: fix zero out valid data

If append-dio feature is enabled, direct-io write and fallocate could
run in parallel to extend file size, fallocate used "orig_isize" to
record i_size before taking "ip_alloc_sem", when
ocfs2_zeroout_partial_cluster() zeroout EOF blocks, i_size maybe already
extended by ocfs2_dio_end_io_write(), that will cause valid data zeroed
out.

Link: https://lkml.kernel.org/r/20210722054923.24389-1-junxiao.bi@oracle.com
Fixes: 6bba4471f0cc ("ocfs2: fix data corruption by fallocate")
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Jun Piao <piaojun@huawei.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agolib/test_string.c: move string selftest in the Runtime Testing menu
Matteo Croce [Thu, 29 Jul 2021 21:53:35 +0000 (14:53 -0700)]
lib/test_string.c: move string selftest in the Runtime Testing menu

STRING_SELFTEST is presented in the "Library routines" menu.  Move it in
Kernel hacking > Kernel Testing and Coverage > Runtime Testing together
with other similar tests found in lib/

--- Runtime Testing
<*>   Test functions located in the hexdump module at runtime
<*>   Test string functions (NEW)
<*>   Test functions located in the string_helpers module at runtime
<*>   Test strscpy*() family of functions at runtime
<*>   Test kstrto*() family of functions at runtime
<*>   Test printf() family of functions at runtime
<*>   Test scanf() family of functions at runtime

Link: https://lkml.kernel.org/r/20210719185158.190371-1-mcroce@linux.microsoft.com
Signed-off-by: Matteo Croce <mcroce@microsoft.com>
Cc: Peter Rosin <peda@axentia.se>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agogve: Update MAINTAINERS list
Catherine Sullivan [Thu, 29 Jul 2021 15:52:58 +0000 (08:52 -0700)]
gve: Update MAINTAINERS list

The team maintaining the gve driver has undergone some changes,
this updates the MAINTAINERS file accordingly.

Signed-off-by: Catherine Sullivan <csully@google.com>
Signed-off-by: Jon Olson <jonolson@google.com>
Signed-off-by: David Awogbemila <awogbemila@google.com>
Signed-off-by: Jeroen de Borst <jeroendb@google.com>
Link: https://lore.kernel.org/r/20210729155258.442650-1-csully@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
3 years agoarch: Kconfig: clean up obsolete use of HAVE_IDE
Lukas Bulwahn [Wed, 28 Jul 2021 18:21:15 +0000 (20:21 +0200)]
arch: Kconfig: clean up obsolete use of HAVE_IDE

The arch-specific Kconfig files use HAVE_IDE to indicate if IDE is
supported.

As IDE support and the HAVE_IDE config vanishes with commit b7fb14d3ac63
("ide: remove the legacy ide driver"), there is no need to mention
HAVE_IDE in all those arch-specific Kconfig files.

The issue was identified with ./scripts/checkkconfigsymbols.py.

Fixes: b7fb14d3ac63 ("ide: remove the legacy ide driver")
Suggested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20210728182115.4401-1-lukas.bulwahn@gmail.com
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agocan: esd_usb2: fix memory leak
Pavel Skripkin [Tue, 27 Jul 2021 17:00:46 +0000 (20:00 +0300)]
can: esd_usb2: fix memory leak

In esd_usb2_setup_rx_urbs() MAX_RX_URBS coherent buffers are allocated
and there is nothing, that frees them:

1) In callback function the urb is resubmitted and that's all
2) In disconnect function urbs are simply killed, but URB_FREE_BUFFER
   is not set (see esd_usb2_setup_rx_urbs) and this flag cannot be used
   with coherent buffers.

So, all allocated buffers should be freed with usb_free_coherent()
explicitly.

Side note: This code looks like a copy-paste of other can drivers. The
same patch was applied to mcba_usb driver and it works nice with real
hardware. There is no change in functionality, only clean-up code for
coherent buffers.

Fixes: 96d8e90382dc ("can: Add driver for esd CAN-USB/2 device")
Link: https://lore.kernel.org/r/b31b096926dcb35998ad0271aac4b51770ca7cc8.1627404470.git.paskripkin@gmail.com
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
3 years agocan: ems_usb: fix memory leak
Pavel Skripkin [Tue, 27 Jul 2021 17:00:33 +0000 (20:00 +0300)]
can: ems_usb: fix memory leak

In ems_usb_start() MAX_RX_URBS coherent buffers are allocated and
there is nothing, that frees them:

1) In callback function the urb is resubmitted and that's all
2) In disconnect function urbs are simply killed, but URB_FREE_BUFFER
   is not set (see ems_usb_start) and this flag cannot be used with
   coherent buffers.

So, all allocated buffers should be freed with usb_free_coherent()
explicitly.

Side note: This code looks like a copy-paste of other can drivers. The
same patch was applied to mcba_usb driver and it works nice with real
hardware. There is no change in functionality, only clean-up code for
coherent buffers.

Fixes: 702171adeed3 ("ems_usb: Added support for EMS CPC-USB/ARM7 CAN/USB interface")
Link: https://lore.kernel.org/r/59aa9fbc9a8cbf9af2bbd2f61a659c480b415800.1627404470.git.paskripkin@gmail.com
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
3 years agocan: usb_8dev: fix memory leak
Pavel Skripkin [Tue, 27 Jul 2021 16:59:57 +0000 (19:59 +0300)]
can: usb_8dev: fix memory leak

In usb_8dev_start() MAX_RX_URBS coherent buffers are allocated and
there is nothing, that frees them:

1) In callback function the urb is resubmitted and that's all
2) In disconnect function urbs are simply killed, but URB_FREE_BUFFER
   is not set (see usb_8dev_start) and this flag cannot be used with
   coherent buffers.

So, all allocated buffers should be freed with usb_free_coherent()
explicitly.

Side note: This code looks like a copy-paste of other can drivers. The
same patch was applied to mcba_usb driver and it works nice with real
hardware. There is no change in functionality, only clean-up code for
coherent buffers.

Fixes: 0024d8ad1639 ("can: usb_8dev: Add support for USB2CAN interface from 8 devices")
Link: https://lore.kernel.org/r/d39b458cd425a1cf7f512f340224e6e9563b07bd.1627404470.git.paskripkin@gmail.com
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
3 years agocan: mcba_usb_start(): add missing urb->transfer_dma initialization
Pavel Skripkin [Sun, 25 Jul 2021 10:36:30 +0000 (13:36 +0300)]
can: mcba_usb_start(): add missing urb->transfer_dma initialization

Yasushi reported, that his Microchip CAN Analyzer stopped working
since commit 91c02557174b ("can: mcba_usb: fix memory leak in
mcba_usb"). The problem was in missing urb->transfer_dma
initialization.

In my previous patch to this driver I refactored mcba_usb_start() code
to avoid leaking usb coherent buffers. To archive it, I passed local
stack variable to usb_alloc_coherent() and then saved it to private
array to correctly free all coherent buffers on ->close() call. But I
forgot to initialize urb->transfer_dma with variable passed to
usb_alloc_coherent().

All of this was causing device to not work, since dma addr 0 is not
valid and following log can be found on bug report page, which points
exactly to problem described above.

| DMAR: [DMA Write] Request device [00:14.0] PASID ffffffff fault addr 0 [fault reason 05] PTE Write access is not set

Fixes: 91c02557174b ("can: mcba_usb: fix memory leak in mcba_usb")
Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=990850
Link: https://lore.kernel.org/r/20210725103630.23864-1-paskripkin@gmail.com
Cc: linux-stable <stable@vger.kernel.org>
Reported-by: Yasushi SHOJI <yasushi.shoji@gmail.com>
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Tested-by: Yasushi SHOJI <yashi@spacecubics.com>
[mkl: fixed typos in commit message - thanks Yasushi SHOJI]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
3 years agocan: hi311x: fix a signedness bug in hi3110_cmd()
Dan Carpenter [Thu, 29 Jul 2021 14:12:46 +0000 (17:12 +0300)]
can: hi311x: fix a signedness bug in hi3110_cmd()

The hi3110_cmd() is supposed to return zero on success and negative
error codes on failure, but it was accidentally declared as a u8 when
it needs to be an int type.

Fixes: 57e83fb9b746 ("can: hi311x: Add Holt HI-311x CAN driver")
Link: https://lore.kernel.org/r/20210729141246.GA1267@kili
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
3 years agoMAINTAINERS: add Yasushi SHOJI as reviewer for the Microchip CAN BUS Analyzer Tool...
Marc Kleine-Budde [Mon, 26 Jul 2021 09:26:44 +0000 (11:26 +0200)]
MAINTAINERS: add Yasushi SHOJI as reviewer for the Microchip CAN BUS Analyzer Tool driver

This patch adds Yasushi SHOJI as a reviewer for the Microchip CAN BUS
Analyzer Tool driver.

Link: https://lore.kernel.org/r/20210726111619.1023991-1-mkl@pengutronix.de
Acked-by: Yasushi SHOJI <yashi@spacecubics.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
3 years agoMerge tag 'drm-fixes-2021-07-30' of git://anongit.freedesktop.org/drm/drm
Linus Torvalds [Fri, 30 Jul 2021 05:10:05 +0000 (22:10 -0700)]
Merge tag 'drm-fixes-2021-07-30' of git://anongit.freedesktop.org/drm/drm

Pull drm fixes from Dave Airlie:
 "Regular drm fixes pull, seems about the right size, lots of small
  fixes across the board, mostly amdgpu, but msm and i915 are in there
  along with panel and ttm.

  amdgpu:
   - Fix resource leak in an error path
   - Avoid stack contents exposure in error path
   - pmops check fix for S0ix vs S3
   - DCN 2.1 display fixes
   - DCN 2.0 display fix
   - Backlight control fix for laptops with HDR panels
   - Maintainers updates

  i915:
   - Fix vbt port mask
   - Fix around reading the right DSC disable fuse in display_ver 10
   - Split display version 9 and 10 in intel_setup_outputs

  msm:
   - iommu fault display fix
   - misc dp compliance fixes
   - dpu reg sizing fix

  panel:
   - Fix bpc for ytc700tlag_05_201c

  ttm:
   - debugfs init fixes"

* tag 'drm-fixes-2021-07-30' of git://anongit.freedesktop.org/drm/drm:
  maintainers: add bugs and chat URLs for amdgpu
  drm/amdgpu/display: only enable aux backlight control for OLED panels
  drm/amd/display: ensure dentist display clock update finished in DCN20
  drm/amd/display: Add missing DCN21 IP parameter
  drm/amd/display: Guard DST_Y_PREFETCH register overflow in DCN21
  drm/amdgpu: Check pmops for desired suspend state
  drm/msm/dp: Initialize dp->aux->drm_dev before registration
  drm/msm/dp: signal audio plugged change at dp_pm_resume
  drm/msm/dp: Initialize the INTF_CONFIG register
  drm/msm/dp: use dp_ctrl_off_link_stream during PHY compliance test run
  drm/msm: Fix display fault handling
  drm/msm/dpu: Fix sm8250_mdp register length
  drm/amdgpu: Avoid printing of stack contents on firmware load error
  drm/amdgpu: Fix resource leak on probe error path
  drm/i915/display: split DISPLAY_VER 9 and 10 in intel_setup_outputs()
  drm/i915: fix not reading DSC disable fuse in GLK
  drm/i915/bios: Fix ports mask
  drm/panel: panel-simple: Fix proper bpc for ytc700tlag_05_201c
  drm/ttm: Initialize debugfs from ttm_global_init()

3 years agoMerge tag 'fallthrough-fixes-clang-5.14-rc4' of git://git.kernel.org/pub/scm/linux...
Linus Torvalds [Fri, 30 Jul 2021 04:03:47 +0000 (21:03 -0700)]
Merge tag 'fallthrough-fixes-clang-5.14-rc4' of git://git./linux/kernel/git/gustavoars/linux

Pull fallthrough fixes from Gustavo Silva:
 "Fix some fall-through warnings when building with Clang and
  '-Wimplicit-fallthrough' on ARM"

* tag 'fallthrough-fixes-clang-5.14-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux:
  scsi: fas216: Fix fall-through warning for Clang
  scsi: acornscsi: Fix fall-through warning for clang
  ARM: riscpc: Fix fall-through warning for Clang

3 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mattst88...
Linus Torvalds [Fri, 30 Jul 2021 03:57:56 +0000 (20:57 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/mattst88/alpha

Pull alpha updates from Matt Turner:
 "They're mostly small janitorial fixes but there's also more important
  ones:

   - drop the alpha-specific x86 binary loader (David Hildenbrand)

   - regression fix for at least Marvel platforms (Mike Rapoport)

   - fix for a scary-looking typo (Zheng Yongjun)"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mattst88/alpha:
  alpha: register early reserved memory in memblock
  alpha: fix spelling mistakes
  alpha: Remove space between * and parameter name
  alpha: fp_emul: avoid init/cleanup_module names
  alpha: Add syscall_get_return_value()
  binfmt: remove support for em86 (alpha only)
  alpha: fix typos in a comment
  alpha: defconfig: add necessary configs for boot testing
  alpha: Send stop IPI to send to online CPUs
  alpha: convert comma to semicolon
  alpha: remove undef inline in compiler.h
  alpha: Kconfig: Replace HTTP links with HTTPS ones
  alpha: __udiv_qrnnd should be exported

3 years agoscsi: fas216: Fix fall-through warning for Clang
Gustavo A. R. Silva [Mon, 26 Jul 2021 20:46:47 +0000 (15:46 -0500)]
scsi: fas216: Fix fall-through warning for Clang

Fix the following fallthrough warning (on ARM):

drivers/scsi/arm/fas216.c:1379:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
           default:
           ^
   drivers/scsi/arm/fas216.c:1379:2: note: insert 'break;' to avoid fall-through
           default:
           ^
           break;

Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/lkml/202107260355.bF00i5bi-lkp@intel.com/
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
3 years agoscsi: acornscsi: Fix fall-through warning for clang
Gustavo A. R. Silva [Mon, 26 Jul 2021 20:33:53 +0000 (15:33 -0500)]
scsi: acornscsi: Fix fall-through warning for clang

Fix the following fallthrough warning (on ARM):

drivers/scsi/arm/acornscsi.c:2651:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
           case res_success:
           ^
   drivers/scsi/arm/acornscsi.c:2651:2: note: insert '__attribute__((fallthrough));' to silence this warning
           case res_success:
           ^
           __attribute__((fallthrough));
   drivers/scsi/arm/acornscsi.c:2651:2: note: insert 'break;' to avoid fall-through
           case res_success:
           ^
           break;
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/lkml/202107260355.bF00i5bi-lkp@intel.com/
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
3 years agoARM: riscpc: Fix fall-through warning for Clang
Gustavo A. R. Silva [Mon, 26 Jul 2021 20:06:22 +0000 (15:06 -0500)]
ARM: riscpc: Fix fall-through warning for Clang

Fix the following fallthrough warning:

arch/arm/mach-rpc/riscpc.c:52:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
           default:
           ^
arch/arm/mach-rpc/riscpc.c:52:2: note: insert 'break;' to avoid fall-through
           default:
           ^
           break;

Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/lkml/202107260355.bF00i5bi-lkp@intel.com/
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
3 years agoMerge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Linus Torvalds [Thu, 29 Jul 2021 16:42:09 +0000 (09:42 -0700)]
Merge tag 'for-linus' of git://git./virt/kvm/kvm

Pull kvm fixes from Paolo Bonzini:
 "ARM:

   - Fix MTE shared page detection

   - Enable selftest's use of PMU registers when asked to

  s390:

   - restore 5.13 debugfs names

  x86:

   - fix sizes for vcpu-id indexed arrays

   - fixes for AMD virtualized LAPIC (AVIC)

   - other small bugfixes

  Generic:

   - access tracking performance test

   - dirty_log_perf_test command line parsing fix

   - Fix selftest use of obsolete pthread_yield() in favour of
     sched_yield()

   - use cpu_relax when halt polling

   - fixed missing KVM_CLEAR_DIRTY_LOG compat ioctl"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: add missing compat KVM_CLEAR_DIRTY_LOG
  KVM: use cpu_relax when halt polling
  KVM: SVM: use vmcb01 in svm_refresh_apicv_exec_ctrl
  KVM: SVM: tweak warning about enabled AVIC on nested entry
  KVM: SVM: svm_set_vintr don't warn if AVIC is active but is about to be deactivated
  KVM: s390: restore old debugfs names
  KVM: SVM: delay svm_vcpu_init_msrpm after svm->vmcb is initialized
  KVM: selftests: Introduce access_tracking_perf_test
  KVM: selftests: Fix missing break in dirty_log_perf_test arg parsing
  x86/kvm: fix vcpu-id indexed array sizes
  KVM: x86: Check the right feature bit for MSR_KVM_ASYNC_PF_ACK access
  docs: virt: kvm: api.rst: replace some characters
  KVM: Documentation: Fix KVM_CAP_ENFORCE_PV_FEATURE_CPUID name
  KVM: nSVM: Swap the parameter order for svm_copy_vmrun_state()/svm_copy_vmloadsave_state()
  KVM: nSVM: Rename nested_svm_vmloadsave() to svm_copy_vmloadsave_state()
  KVM: arm64: selftests: get-reg-list: actually enable pmu regs in pmu sublist
  KVM: selftests: change pthread_yield to sched_yield
  KVM: arm64: Fix detection of shared VMAs on guest fault

3 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu
Linus Torvalds [Thu, 29 Jul 2021 16:28:24 +0000 (09:28 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/gerg/m68knommu

Pull m68knommu fix from Greg Ungerer:
 "A single compile time fix"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu:
  m68k/coldfire: change pll var. to clk_pll

3 years agoxfs: prevent spoofing of rtbitmap blocks when recovering buffers
Darrick J. Wong [Mon, 26 Jul 2021 23:43:17 +0000 (16:43 -0700)]
xfs: prevent spoofing of rtbitmap blocks when recovering buffers

While reviewing the buffer item recovery code, the thought occurred to
me: in V5 filesystems we use log sequence number (LSN) tracking to avoid
replaying older metadata updates against newer log items.  However, we
use the magic number of the ondisk buffer to find the LSN of the ondisk
metadata, which means that if an attacker can control the layout of the
realtime device precisely enough that the start of an rt bitmap block
matches the magic and UUID of some other kind of block, they can control
the purported LSN of that spoofed block and thereby break log replay.

Since realtime bitmap and summary blocks don't have headers at all, we
have no way to tell if a block really should be replayed.  The best we
can do is replay unconditionally and hope for the best.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
3 years agoxfs: limit iclog tail updates
Dave Chinner [Thu, 29 Jul 2021 00:14:11 +0000 (17:14 -0700)]
xfs: limit iclog tail updates

From the department of "generic/482 keeps on giving", we bring you
another tail update race condition:

iclog:
S1 C1
+-----------------------+-----------------------+
 S2 EOIC

Two checkpoints in a single iclog. One is complete, the other just
contains the start record and overruns into a new iclog.

Timeline:

Before S1: Cache flush, log tail = X
At S1: Metadata stable, write start record and checkpoint
At C1: Write commit record, set NEED_FUA
Single iclog checkpoint, so no need for NEED_FLUSH
Log tail still = X, so no need for NEED_FLUSH

After C1,
Before S2: Cache flush, log tail = X
At S2: Metadata stable, write start record and checkpoint
After S2: Log tail moves to X+1
At EOIC: End of iclog, more journal data to write
Releases iclog
Not a commit iclog, so no need for NEED_FLUSH
Writes log tail X+1 into iclog.

At this point, the iclog has tail X+1 and NEED_FUA set. There has
been no cache flush for the metadata between X and X+1, and the
iclog writes the new tail permanently to the log. THis is sufficient
to violate on disk metadata/journal ordering.

We have two options here. The first is to detect this case in some
manner and ensure that the partial checkpoint write sets NEED_FLUSH
when the iclog is already marked NEED_FUA and the log tail changes.
This seems somewhat fragile and quite complex to get right, and it
doesn't actually make it obvious what underlying problem it is
actually addressing from reading the code.

The second option seems much cleaner to me, because it is derived
directly from the requirements of the C1 commit record in the iclog.
That is, when we write this commit record to the iclog, we've
guaranteed that the metadata/data ordering is correct for tail
update purposes. Hence if we only write the log tail into the iclog
for the *first* commit record rather than the log tail at the last
release, we guarantee that the log tail does not move past where the
the first commit record in the log expects it to be.

IOWs, taking the first option means that replay of C1 becomes
dependent on future operations doing the right thing, not just the
C1 checkpoint itself doing the right thing. This makes log recovery
almost impossible to reason about because now we have to take into
account what might or might not have happened in the future when
looking at checkpoints in the log rather than just having to
reconstruct the past...

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
3 years agoxfs: need to see iclog flags in tracing
Dave Chinner [Tue, 27 Jul 2021 23:23:50 +0000 (16:23 -0700)]
xfs: need to see iclog flags in tracing

Because I cannot tell if the NEED_FLUSH flag is being set correctly
by the log force and CIL push machinery without it.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>