[PATCH v2 4.19 0/6] close udev startup race condition for several devices

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Jeffle Xu

23 Feb 2021 23 Feb '21

9:28 a.m.

Please refer to v1 ([1]) and background ([2]) for more details.

As Sasha suggested in [3], revert commit 9e07f4e24379 ("zram: close udev startup race condition as default groups") first, and then apply the original patch set.

- patch 5: fix the issue of zram that the original commit (9e07f4e24379) wants to fix - patch 6: fix the issue of virtio-blk ([2]) - patch 3/4: I have not occured with these two issues in real world. Put here just for completeness.

This patch set is for 4.19, though it shall be backported to 4.4/4.9/4.14/4.19. Send this patch set out first for more feedbacks.

I have only tested the issue of virtio-blk though.

[1] https://lore.kernel.org/stable/20210207114656.32141-1-jefflexu@linux.alibaba... [2] https://lore.kernel.org/stable/f466aacc-f9ca-49ca-0da8-16dc045c9000@linux.al... [3] https://lore.kernel.org/stable/20210207224612.GY4035784@sasha-vm/

Hannes Reinecke (5): block: genhd: add 'groups' argument to device_add_disk nvme: register ns_id attributes as default sysfs groups aoe: register default groups with device_add_disk() zram: register default groups with device_add_disk() virtio-blk: modernize sysfs attribute creation

Jeffle Xu (1): Revert "zram: close udev startup race condition as default groups"

-- 2.27.0

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Jeffle Xu

23 Feb 23 Feb

9:28 a.m.

New subject: [PATCH v2 4.19 1/6] Revert "zram: close udev startup race condition as default groups"

This reverts commit 9e07f4e243791e00a4086ad86e573705cf7b2c65.

The original commit is actually a "merged" fix of [1] and [2], as described in [3]. Since now we have more fixes that rely on [1], revert this commit first, and then get the original [1] and [2] merged.

[1] fef912bf860e, block: genhd: add 'groups' argument to device_add_disk [2] 98af4d4df889, zram: register default groups with device_add_disk() [3] https://www.spinics.net/lists/stable/msg442196.html

Signed-off-by: Jeffle Xu jefflexu@linux.alibaba.com --- drivers/block/zram/zram_drv.c | 26 ++++++++++++++++++++------ 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 52850c10165e..dfc53619dcdd 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1644,11 +1644,6 @@ static const struct attribute_group zram_disk_attr_group = { .attrs = zram_disk_attrs, };

-static const struct attribute_group *zram_disk_attr_groups[] = { - &zram_disk_attr_group, - NULL, -}; - /* * Allocate and initialize new zram device. the function returns * '>= 0' device_id upon success, and negative value otherwise. @@ -1729,15 +1724,24 @@ static int zram_add(void)

zram->disk->queue->backing_dev_info->capabilities |= (BDI_CAP_STABLE_WRITES | BDI_CAP_SYNCHRONOUS_IO); - disk_to_dev(zram->disk)->groups = zram_disk_attr_groups; add_disk(zram->disk);

+ ret = sysfs_create_group(&disk_to_dev(zram->disk)->kobj, + &zram_disk_attr_group); + if (ret < 0) { + pr_err("Error creating sysfs group for device %d\n", + device_id); + goto out_free_disk; + } strlcpy(zram->compressor, default_compressor, sizeof(zram->compressor));

zram_debugfs_register(zram); pr_info("Added device: %s\n", zram->disk->disk_name); return device_id;

+out_free_disk: + del_gendisk(zram->disk); + put_disk(zram->disk); out_free_queue: blk_cleanup_queue(queue); out_free_idr: @@ -1766,6 +1770,16 @@ static int zram_remove(struct zram *zram) mutex_unlock(&bdev->bd_mutex);

zram_debugfs_unregister(zram); + /* + * Remove sysfs first, so no one will perform a disksize + * store while we destroy the devices. This also helps during + * hot_remove -- zram_reset_device() is the last holder of + * ->init_lock, no later/concurrent disksize_store() or any + * other sysfs handlers are possible. + */ + sysfs_remove_group(&disk_to_dev(zram->disk)->kobj, + &zram_disk_attr_group); + /* Make sure all the pending I/O are finished */ fsync_bdev(bdev); zram_reset_device(zram);

-- 2.27.0

Jeffle Xu

9:28 a.m.

New subject: [PATCH v2 4.19 2/6] block: genhd: add 'groups' argument to device_add_disk

From: Hannes Reinecke hare@suse.de

commit fef912bf860e8e7e48a2bfb978a356bba743a8b7 upstream.

Update device_add_disk() to take an 'groups' argument so that individual drivers can register a device with additional sysfs attributes. This avoids race condition the driver would otherwise have if these groups were to be created with sysfs_add_groups().

diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c index 748bd0921dff..788c80abff5d 100644 --- a/arch/um/drivers/ubd_kern.c +++ b/arch/um/drivers/ubd_kern.c @@ -891,7 +891,7 @@ static int ubd_disk_register(int major, u64 size, int unit,

disk->private_data = &ubd_devs[unit]; disk->queue = ubd_devs[unit].queue; - device_add_disk(parent, disk); + device_add_disk(parent, disk, NULL);

*disk_out = disk; return 0; diff --git a/block/genhd.c b/block/genhd.c index 6965dde96373..aee2fa9de1a7 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -582,7 +582,8 @@ static int exact_lock(dev_t devt, void *data) return 0; }

-static void register_disk(struct device *parent, struct gendisk *disk) +static void register_disk(struct device *parent, struct gendisk *disk, + const struct attribute_group **groups) { struct device *ddev = disk_to_dev(disk); struct block_device *bdev; @@ -597,6 +598,10 @@ static void register_disk(struct device *parent, struct gendisk *disk) /* delay uevents, until we scanned partition table */ dev_set_uevent_suppress(ddev, 1);

+ if (groups) { + WARN_ON(ddev->groups); + ddev->groups = groups; + } if (device_add(ddev)) return; if (!sysfs_deprecated) { @@ -664,6 +669,7 @@ static void register_disk(struct device *parent, struct gendisk *disk) * __device_add_disk - add disk information to kernel list * @parent: parent device for the disk * @disk: per-device partitioning information + * @groups: Additional per-device sysfs groups * @register_queue: register the queue if set to true * * This function registers the partitioning information in @disk @@ -672,6 +678,7 @@ static void register_disk(struct device *parent, struct gendisk *disk) * FIXME: error handling */ static void __device_add_disk(struct device *parent, struct gendisk *disk, + const struct attribute_group **groups, bool register_queue) { dev_t devt; @@ -715,7 +722,7 @@ static void __device_add_disk(struct device *parent, struct gendisk *disk, blk_register_region(disk_devt(disk), disk->minors, NULL, exact_match, exact_lock, disk); } - register_disk(parent, disk); + register_disk(parent, disk, groups); if (register_queue) blk_register_queue(disk);

@@ -729,15 +736,17 @@ static void __device_add_disk(struct device *parent, struct gendisk *disk, blk_integrity_add(disk); }

-void device_add_disk(struct device *parent, struct gendisk *disk) +void device_add_disk(struct device *parent, struct gendisk *disk, + const struct attribute_group **groups) + { - __device_add_disk(parent, disk, true); + __device_add_disk(parent, disk, groups, true); } EXPORT_SYMBOL(device_add_disk);

void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk) { - __device_add_disk(parent, disk, false); + __device_add_disk(parent, disk, NULL, false); } EXPORT_SYMBOL(device_add_disk_no_queue_reg);

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c index bf222c4b2f82..8f444b375761 100644 --- a/drivers/block/floppy.c +++ b/drivers/block/floppy.c @@ -4713,7 +4713,7 @@ static int __init do_floppy_init(void) /* to be cleaned up... */ disks[drive]->private_data = (void *)(long)drive; disks[drive]->flags |= GENHD_FL_REMOVABLE; - device_add_disk(&floppy_device[drive].dev, disks[drive]); + device_add_disk(&floppy_device[drive].dev, disks[drive], NULL); }

return 0; diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c index d0666f5ce003..1d7d48d8a205 100644 --- a/drivers/block/mtip32xx/mtip32xx.c +++ b/drivers/block/mtip32xx/mtip32xx.c @@ -3861,7 +3861,7 @@ static int mtip_block_initialize(struct driver_data *dd) set_capacity(dd->disk, capacity);

/* Enable the block device and add it to /dev */ - device_add_disk(&dd->pdev->dev, dd->disk); + device_add_disk(&dd->pdev->dev, dd->disk, NULL);

dd->bdev = bdget_disk(dd->disk, 0); /* diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c index bd1c66f5631a..42bff6b1d6a8 100644 --- a/drivers/block/ps3disk.c +++ b/drivers/block/ps3disk.c @@ -499,7 +499,7 @@ static int ps3disk_probe(struct ps3_system_bus_device *_dev) gendisk->disk_name, priv->model, priv->raw_capacity >> 11, get_capacity(gendisk) >> 11);

- device_add_disk(&dev->sbd.core, gendisk); + device_add_disk(&dev->sbd.core, gendisk, NULL); return 0;

fail_cleanup_queue: diff --git a/drivers/block/ps3vram.c b/drivers/block/ps3vram.c index 1e3d5de9d838..c0c50816a10b 100644 --- a/drivers/block/ps3vram.c +++ b/drivers/block/ps3vram.c @@ -769,7 +769,7 @@ static int ps3vram_probe(struct ps3_system_bus_device *dev) dev_info(&dev->core, "%s: Using %lu MiB of GPU memory\n", gendisk->disk_name, get_capacity(gendisk) >> 11);

- device_add_disk(&dev->core, gendisk); + device_add_disk(&dev->core, gendisk, NULL); return 0;

fail_cleanup_queue: diff --git a/drivers/block/rsxx/dev.c b/drivers/block/rsxx/dev.c index 1a92f9e65937..3894aa0f350b 100644 --- a/drivers/block/rsxx/dev.c +++ b/drivers/block/rsxx/dev.c @@ -226,7 +226,7 @@ int rsxx_attach_dev(struct rsxx_cardinfo *card) set_capacity(card->gendisk, card->size8 >> 9); else set_capacity(card->gendisk, 0); - device_add_disk(CARD_TO_DEV(card), card->gendisk); + device_add_disk(CARD_TO_DEV(card), card->gendisk, NULL); card->bdev_attached = 1; }

diff --git a/drivers/block/skd_main.c b/drivers/block/skd_main.c index 27323fa23997..80a5806ede03 100644 --- a/drivers/block/skd_main.c +++ b/drivers/block/skd_main.c @@ -3104,7 +3104,7 @@ static int skd_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo) static int skd_bdev_attach(struct device *parent, struct skd_device *skdev) { dev_dbg(&skdev->pdev->dev, "add_disk\n"); - device_add_disk(parent, skdev->disk); + device_add_disk(parent, skdev->disk, NULL); return 0; }

diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c index 5d7024057540..6b7b0d8a2acb 100644 --- a/drivers/block/sunvdc.c +++ b/drivers/block/sunvdc.c @@ -862,7 +862,7 @@ static int probe_disk(struct vdc_port *port) port->vdisk_size, (port->vdisk_size >> (20 - 9)), port->vio.ver.major, port->vio.ver.minor);

- device_add_disk(&port->vio.vdev->dev, g); + device_add_disk(&port->vio.vdev->dev, g, NULL);

return 0; } diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 075523777a4a..e03e13a3f32c 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -858,7 +858,7 @@ static int virtblk_probe(struct virtio_device *vdev) virtblk_update_capacity(vblk, false); virtio_device_ready(vdev);

- device_add_disk(&vdev->dev, vblk->disk); + device_add_disk(&vdev->dev, vblk->disk, NULL); err = device_create_file(disk_to_dev(vblk->disk), &dev_attr_serial); if (err) goto out_del_disk; diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index d4ceee3825f8..1b06c8e46ffa 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -2422,7 +2422,7 @@ static void blkfront_connect(struct blkfront_info *info) for (i = 0; i < info->nr_rings; i++) kick_pending_request_queues(&info->rinfo[i]);

- device_add_disk(&info->xbdev->dev, info->gd); + device_add_disk(&info->xbdev->dev, info->gd, NULL);

info->is_ready = 1; return; diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c index 44a7a255ef74..f9b59d41813f 100644 --- a/drivers/ide/ide-cd.c +++ b/drivers/ide/ide-cd.c @@ -1784,7 +1784,7 @@ static int ide_cd_probe(ide_drive_t *drive) ide_cd_read_toc(drive); g->fops = &idecd_ops; g->flags |= GENHD_FL_REMOVABLE | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; - device_add_disk(&drive->gendev, g); + device_add_disk(&drive->gendev, g, NULL); return 0;

out_free_disk: diff --git a/drivers/ide/ide-gd.c b/drivers/ide/ide-gd.c index e823394ed543..04e008e8f6f9 100644 --- a/drivers/ide/ide-gd.c +++ b/drivers/ide/ide-gd.c @@ -416,7 +416,7 @@ static int ide_gd_probe(ide_drive_t *drive) if (drive->dev_flags & IDE_DFLAG_REMOVABLE) g->flags = GENHD_FL_REMOVABLE; g->fops = &ide_gd_ops; - device_add_disk(&drive->gendev, g); + device_add_disk(&drive->gendev, g, NULL); return 0;

out_free_disk: diff --git a/drivers/memstick/core/ms_block.c b/drivers/memstick/core/ms_block.c index 716fc8ed31d3..8a02f11076f9 100644 --- a/drivers/memstick/core/ms_block.c +++ b/drivers/memstick/core/ms_block.c @@ -2146,7 +2146,7 @@ static int msb_init_disk(struct memstick_dev *card) set_disk_ro(msb->disk, 1);

msb_start(card); - device_add_disk(&card->dev, msb->disk); + device_add_disk(&card->dev, msb->disk, NULL); dbg("Disk added"); return 0;

diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c index 5ee932631fae..0cd30dcb6801 100644 --- a/drivers/memstick/core/mspro_block.c +++ b/drivers/memstick/core/mspro_block.c @@ -1236,7 +1236,7 @@ static int mspro_block_init_disk(struct memstick_dev *card) set_capacity(msb->disk, capacity); dev_dbg(&card->dev, "capacity set %ld\n", capacity);

- device_add_disk(&card->dev, msb->disk); + device_add_disk(&card->dev, msb->disk, NULL); msb->active = 1; return 0;

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index 90656b625b9a..77324ea4eb93 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -2671,7 +2671,7 @@ static int mmc_add_disk(struct mmc_blk_data *md) int ret; struct mmc_card *card = md->queue.card;

- device_add_disk(md->parent, md->disk); + device_add_disk(md->parent, md->disk, NULL); md->force_ro.show = force_ro_show; md->force_ro.store = force_ro_store; sysfs_attr_init(&md->force_ro.attr); diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c index 29c0bfd74e8a..6a41dfa3c36b 100644 --- a/drivers/mtd/mtd_blkdevs.c +++ b/drivers/mtd/mtd_blkdevs.c @@ -447,7 +447,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new) if (new->readonly) set_disk_ro(gd, 1);

- device_add_disk(&new->mtd->dev, gd); + device_add_disk(&new->mtd->dev, gd, NULL);

if (new->disk_attributes) { ret = sysfs_create_group(&disk_to_dev(gd)->kobj, diff --git a/drivers/nvdimm/blk.c b/drivers/nvdimm/blk.c index 62e9cb167aad..db45c6bbb7bb 100644 --- a/drivers/nvdimm/blk.c +++ b/drivers/nvdimm/blk.c @@ -290,7 +290,7 @@ static int nsblk_attach_disk(struct nd_namespace_blk *nsblk) }

set_capacity(disk, available_disk_size >> SECTOR_SHIFT); - device_add_disk(dev, disk); + device_add_disk(dev, disk, NULL); revalidate_disk(disk); return 0; } diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c index 853edc649ed4..b6823e66af13 100644 --- a/drivers/nvdimm/btt.c +++ b/drivers/nvdimm/btt.c @@ -1565,7 +1565,7 @@ static int btt_blk_init(struct btt *btt) } } set_capacity(btt->btt_disk, btt->nlba * btt->sector_size >> 9); - device_add_disk(&btt->nd_btt->dev, btt->btt_disk); + device_add_disk(&btt->nd_btt->dev, btt->btt_disk, NULL); btt->nd_btt->size = btt->nlba * (u64)btt->sector_size; revalidate_disk(btt->btt_disk);

diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index a7ce2f1761a2..d6f981f6ef59 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -479,7 +479,7 @@ static int pmem_attach_disk(struct device *dev, gendev = disk_to_dev(disk); gendev->groups = pmem_attribute_groups;

- device_add_disk(dev, disk); + device_add_disk(dev, disk, NULL); if (devm_add_action_or_reset(dev, pmem_release_disk, pmem)) return -ENOMEM;

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index b633ea40430e..244a693c35de 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3211,7 +3211,7 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)

nvme_get_ctrl(ctrl);

- device_add_disk(ctrl->device, ns->disk); + device_add_disk(ctrl->device, ns->disk, NULL); if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj, &nvme_ns_id_attr_group)) pr_warn("%s: failed to create sysfs group for identification\n", diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index e71075338ff5..ee9e092ace4a 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -314,7 +314,7 @@ static void nvme_mpath_set_live(struct nvme_ns *ns) return;

if (!(head->disk->flags & GENHD_FL_UP)) { - device_add_disk(&head->subsys->dev, head->disk); + device_add_disk(&head->subsys->dev, head->disk, NULL); if (sysfs_create_group(&disk_to_dev(head->disk)->kobj, &nvme_ns_id_attr_group)) dev_warn(&head->subsys->dev, diff --git a/drivers/s390/block/dasd_genhd.c b/drivers/s390/block/dasd_genhd.c index 7036a6c6f86f..5542d9eadfe0 100644 --- a/drivers/s390/block/dasd_genhd.c +++ b/drivers/s390/block/dasd_genhd.c @@ -76,7 +76,7 @@ int dasd_gendisk_alloc(struct dasd_block *block) gdp->queue = block->request_queue; block->gdp = gdp; set_capacity(block->gdp, 0); - device_add_disk(&base->cdev->dev, block->gdp); + device_add_disk(&base->cdev->dev, block->gdp, NULL); return 0; }

diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c index 23e526cda5c1..4e8aedd50cb0 100644 --- a/drivers/s390/block/dcssblk.c +++ b/drivers/s390/block/dcssblk.c @@ -685,7 +685,7 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char }

get_device(&dev_info->dev); - device_add_disk(&dev_info->dev, dev_info->gd); + device_add_disk(&dev_info->dev, dev_info->gd, NULL);

switch (dev_info->segment_type) { case SEG_TYPE_SR: diff --git a/drivers/s390/block/scm_blk.c b/drivers/s390/block/scm_blk.c index 98f66b7b6794..e01889394c84 100644 --- a/drivers/s390/block/scm_blk.c +++ b/drivers/s390/block/scm_blk.c @@ -500,7 +500,7 @@ int scm_blk_dev_setup(struct scm_blk_dev *bdev, struct scm_device *scmdev)

/* 512 byte sectors */ set_capacity(bdev->gendisk, scmdev->size >> 9); - device_add_disk(&scmdev->dev, bdev->gendisk); + device_add_disk(&scmdev->dev, bdev->gendisk, NULL); return 0;

out_queue: diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index f2f14d8d5943..342352d8e7bf 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -3348,7 +3348,7 @@ static void sd_probe_async(void *data, async_cookie_t cookie) }

blk_pm_runtime_init(sdp->request_queue, dev); - device_add_disk(dev, gd); + device_add_disk(dev, gd, NULL); if (sdkp->capacity) sd_dif_config_host(sdkp);

diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c index 5be3d6b7991b..45c8bf39ad23 100644 --- a/drivers/scsi/sr.c +++ b/drivers/scsi/sr.c @@ -758,7 +758,7 @@ static int sr_probe(struct device *dev)

dev_set_drvdata(dev, cd); disk->flags |= GENHD_FL_REMOVABLE; - device_add_disk(&sdev->sdev_gendev, disk); + device_add_disk(&sdev->sdev_gendev, disk, NULL);

sdev_printk(KERN_DEBUG, sdev, "Attached scsi CD-ROM %s\n", cd->cdi.name); diff --git a/include/linux/genhd.h b/include/linux/genhd.h index f993bc86f3ba..a488098f8638 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -402,10 +402,11 @@ static inline void free_part_info(struct hd_struct *part) extern void part_round_stats(struct request_queue *q, int cpu, struct hd_struct *part);

/* block/genhd.c */ -extern void device_add_disk(struct device *parent, struct gendisk *disk); +extern void device_add_disk(struct device *parent, struct gendisk *disk, + const struct attribute_group **groups); static inline void add_disk(struct gendisk *disk) { - device_add_disk(NULL, disk); + device_add_disk(NULL, disk, NULL); } extern void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk); static inline void add_disk_no_queue_reg(struct gendisk *disk)

-- 2.27.0

Jeffle Xu

9:28 a.m.

New subject: [PATCH v2 4.19 3/6] nvme: register ns_id attributes as default sysfs groups

From: Hannes Reinecke hare@suse.de

commit 33b14f67a4e1eabd219fd6543da8f15ed86b641c upstream.

We should be registering the ns_id attribute as default sysfs attribute groups, otherwise we have a race condition between the uevent and the attributes appearing in sysfs.

[Backport Notes] Resolve two context conflicts introduced by following two commits. These two commits are applied after the current commit in upstream, while have been merged into 4.19.y stable tree before the current commit. 1. drivers/nvme/host/core.c:nvme_ns_remove, introduced by commit 2181e455612a ("nvme: fix possible io failures when removing multipathed ns"). 2. drivers/nvme/host/multipath.c:nvme_mpath_set_live, introduced by commit 5e416b11b4a9 ("nvme-multipath: fix possible I/O hang when paths are updated").

Suggested-by: Bart van Assche bvanassche@acm.org Reviewed-by: Keith Busch keith.busch@intel.com Signed-off-by: Hannes Reinecke hare@suse.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Jeffle Xu jefflexu@linux.alibaba.com --- drivers/nvme/host/core.c | 21 +++---- drivers/nvme/host/lightnvm.c | 105 ++++++++++++++-------------------- drivers/nvme/host/multipath.c | 15 ++--- drivers/nvme/host/nvme.h | 10 +--- 4 files changed, 59 insertions(+), 92 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 244a693c35de..513dd1e2aac7 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -2842,6 +2842,14 @@ const struct attribute_group nvme_ns_id_attr_group = { .is_visible = nvme_ns_id_attrs_are_visible, };

+const struct attribute_group *nvme_ns_id_attr_groups[] = { + &nvme_ns_id_attr_group, +#ifdef CONFIG_NVM + &nvme_nvm_attr_group, +#endif + NULL, +}; + #define nvme_show_str_function(field) \ static ssize_t field##_show(struct device *dev, \ struct device_attribute *attr, char *buf) \ @@ -3211,14 +3219,7 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)

nvme_get_ctrl(ctrl);

- device_add_disk(ctrl->device, ns->disk, NULL); - if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj, - &nvme_ns_id_attr_group)) - pr_warn("%s: failed to create sysfs group for identification\n", - ns->disk->disk_name); - if (ns->ndev && nvme_nvm_register_sysfs(ns)) - pr_warn("%s: failed to register lightnvm sysfs group for identification\n", - ns->disk->disk_name); + device_add_disk(ctrl->device, ns->disk, nvme_ns_id_attr_groups);

nvme_mpath_add_disk(ns, id); nvme_fault_inject_init(ns); @@ -3252,10 +3253,6 @@ static void nvme_ns_remove(struct nvme_ns *ns) synchronize_srcu(&ns->head->srcu); /* wait for concurrent submissions */

if (ns->disk && ns->disk->flags & GENHD_FL_UP) { - sysfs_remove_group(&disk_to_dev(ns->disk)->kobj, - &nvme_ns_id_attr_group); - if (ns->ndev) - nvme_nvm_unregister_sysfs(ns); del_gendisk(ns->disk); blk_cleanup_queue(ns->queue); if (blk_get_integrity(ns->disk)) diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c index a69553e75f38..d10257b9c523 100644 --- a/drivers/nvme/host/lightnvm.c +++ b/drivers/nvme/host/lightnvm.c @@ -1193,10 +1193,29 @@ static NVM_DEV_ATTR_12_RO(multiplane_modes); static NVM_DEV_ATTR_12_RO(media_capabilities); static NVM_DEV_ATTR_12_RO(max_phys_secs);

-static struct attribute *nvm_dev_attrs_12[] = { +/* 2.0 values */ +static NVM_DEV_ATTR_20_RO(groups); +static NVM_DEV_ATTR_20_RO(punits); +static NVM_DEV_ATTR_20_RO(chunks); +static NVM_DEV_ATTR_20_RO(clba); +static NVM_DEV_ATTR_20_RO(ws_min); +static NVM_DEV_ATTR_20_RO(ws_opt); +static NVM_DEV_ATTR_20_RO(maxoc); +static NVM_DEV_ATTR_20_RO(maxocpu); +static NVM_DEV_ATTR_20_RO(mw_cunits); +static NVM_DEV_ATTR_20_RO(write_typ); +static NVM_DEV_ATTR_20_RO(write_max); +static NVM_DEV_ATTR_20_RO(reset_typ); +static NVM_DEV_ATTR_20_RO(reset_max); + +static struct attribute *nvm_dev_attrs[] = { + /* version agnostic attrs */ &dev_attr_version.attr, &dev_attr_capabilities.attr, + &dev_attr_read_typ.attr, + &dev_attr_read_max.attr,

+ /* 1.2 attrs */ &dev_attr_vendor_opcode.attr, &dev_attr_device_mode.attr, &dev_attr_media_manager.attr, @@ -1211,8 +1230,6 @@ static struct attribute *nvm_dev_attrs_12[] = { &dev_attr_page_size.attr, &dev_attr_hw_sector_size.attr, &dev_attr_oob_sector_size.attr, - &dev_attr_read_typ.attr, - &dev_attr_read_max.attr, &dev_attr_prog_typ.attr, &dev_attr_prog_max.attr, &dev_attr_erase_typ.attr, @@ -1221,33 +1238,7 @@ static struct attribute *nvm_dev_attrs_12[] = { &dev_attr_media_capabilities.attr, &dev_attr_max_phys_secs.attr,

- NULL, -}; - -static const struct attribute_group nvm_dev_attr_group_12 = { - .name = "lightnvm", - .attrs = nvm_dev_attrs_12, -}; - -/* 2.0 values */ -static NVM_DEV_ATTR_20_RO(groups); -static NVM_DEV_ATTR_20_RO(punits); -static NVM_DEV_ATTR_20_RO(chunks); -static NVM_DEV_ATTR_20_RO(clba); -static NVM_DEV_ATTR_20_RO(ws_min); -static NVM_DEV_ATTR_20_RO(ws_opt); -static NVM_DEV_ATTR_20_RO(maxoc); -static NVM_DEV_ATTR_20_RO(maxocpu); -static NVM_DEV_ATTR_20_RO(mw_cunits); -static NVM_DEV_ATTR_20_RO(write_typ); -static NVM_DEV_ATTR_20_RO(write_max); -static NVM_DEV_ATTR_20_RO(reset_typ); -static NVM_DEV_ATTR_20_RO(reset_max); - -static struct attribute *nvm_dev_attrs_20[] = { - &dev_attr_version.attr, - &dev_attr_capabilities.attr, - + /* 2.0 attrs */ &dev_attr_groups.attr, &dev_attr_punits.attr, &dev_attr_chunks.attr, @@ -1258,8 +1249,6 @@ static struct attribute *nvm_dev_attrs_20[] = { &dev_attr_maxocpu.attr, &dev_attr_mw_cunits.attr,

- &dev_attr_read_typ.attr, - &dev_attr_read_max.attr, &dev_attr_write_typ.attr, &dev_attr_write_max.attr, &dev_attr_reset_typ.attr, @@ -1268,44 +1257,38 @@ static struct attribute *nvm_dev_attrs_20[] = { NULL, };

-static const struct attribute_group nvm_dev_attr_group_20 = { - .name = "lightnvm", - .attrs = nvm_dev_attrs_20, -}; - -int nvme_nvm_register_sysfs(struct nvme_ns *ns) +static umode_t nvm_dev_attrs_visible(struct kobject *kobj, + struct attribute *attr, int index) { + struct device *dev = container_of(kobj, struct device, kobj); + struct gendisk *disk = dev_to_disk(dev); + struct nvme_ns *ns = disk->private_data; struct nvm_dev *ndev = ns->ndev; - struct nvm_geo *geo = &ndev->geo; + struct device_attribute *dev_attr = + container_of(attr, typeof(*dev_attr), attr);

if (!ndev) - return -EINVAL; - - switch (geo->major_ver_id) { - case 1: - return sysfs_create_group(&disk_to_dev(ns->disk)->kobj, - &nvm_dev_attr_group_12); - case 2: - return sysfs_create_group(&disk_to_dev(ns->disk)->kobj, - &nvm_dev_attr_group_20); - } - - return -EINVAL; -} + return 0;

-void nvme_nvm_unregister_sysfs(struct nvme_ns *ns) -{ - struct nvm_dev *ndev = ns->ndev; - struct nvm_geo *geo = &ndev->geo; + if (dev_attr->show == nvm_dev_attr_show) + return attr->mode;

- switch (geo->major_ver_id) { + switch (ndev->geo.major_ver_id) { case 1: - sysfs_remove_group(&disk_to_dev(ns->disk)->kobj, - &nvm_dev_attr_group_12); + if (dev_attr->show == nvm_dev_attr_show_12) + return attr->mode; break; case 2: - sysfs_remove_group(&disk_to_dev(ns->disk)->kobj, - &nvm_dev_attr_group_20); + if (dev_attr->show == nvm_dev_attr_show_20) + return attr->mode; break; } + + return 0; } + +const struct attribute_group nvme_nvm_attr_group = { + .name = "lightnvm", + .attrs = nvm_dev_attrs, + .is_visible = nvm_dev_attrs_visible, +}; diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index ee9e092ace4a..4ef05fe00dac 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -313,13 +313,9 @@ static void nvme_mpath_set_live(struct nvme_ns *ns) if (!head->disk) return;

- if (!(head->disk->flags & GENHD_FL_UP)) { - device_add_disk(&head->subsys->dev, head->disk, NULL); - if (sysfs_create_group(&disk_to_dev(head->disk)->kobj, - &nvme_ns_id_attr_group)) - dev_warn(&head->subsys->dev, - "failed to create id group.\n"); - } + if (!(head->disk->flags & GENHD_FL_UP)) + device_add_disk(&head->subsys->dev, head->disk, + nvme_ns_id_attr_groups);

synchronize_srcu(&ns->head->srcu); kblockd_schedule_work(&ns->head->requeue_work); @@ -541,11 +537,8 @@ void nvme_mpath_remove_disk(struct nvme_ns_head *head) { if (!head->disk) return; - if (head->disk->flags & GENHD_FL_UP) { - sysfs_remove_group(&disk_to_dev(head->disk)->kobj, - &nvme_ns_id_attr_group); + if (head->disk->flags & GENHD_FL_UP) del_gendisk(head->disk); - } blk_set_queue_dying(head->disk->queue); /* make sure all pending bios are cleaned up */ kblockd_schedule_work(&head->requeue_work); diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index 9c2e7a151e40..276975506709 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -464,7 +464,7 @@ int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl); int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp, void *log, size_t size, u64 offset);

-extern const struct attribute_group nvme_ns_id_attr_group; +extern const struct attribute_group *nvme_ns_id_attr_groups[]; extern const struct block_device_operations nvme_ns_head_ops;

#ifdef CONFIG_NVME_MULTIPATH @@ -589,8 +589,7 @@ static inline void nvme_mpath_update_disk_size(struct gendisk *disk) void nvme_nvm_update_nvm_info(struct nvme_ns *ns); int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node); void nvme_nvm_unregister(struct nvme_ns *ns); -int nvme_nvm_register_sysfs(struct nvme_ns *ns); -void nvme_nvm_unregister_sysfs(struct nvme_ns *ns); +extern const struct attribute_group nvme_nvm_attr_group; int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg); #else static inline void nvme_nvm_update_nvm_info(struct nvme_ns *ns) {}; @@ -601,11 +600,6 @@ static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, }

static inline void nvme_nvm_unregister(struct nvme_ns *ns) {}; -static inline int nvme_nvm_register_sysfs(struct nvme_ns *ns) -{ - return 0; -} -static inline void nvme_nvm_unregister_sysfs(struct nvme_ns *ns) {}; static inline int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg) {

-- 2.27.0

Jeffle Xu

9:28 a.m.

New subject: [PATCH v2 4.19 4/6] aoe: register default groups with device_add_disk()

From: Hannes Reinecke hare@suse.de

commit 95cf7809bf9169fec4e4b7bb24b8069d8f354f96 upstream.

Signed-off-by: Hannes Reinecke hare@suse.com Reviewed-by: Christoph Hellwig hch@lst.de Acked-by: Ed L. Cachin ed.cashin@acm.org Reviewed-by: Bart Van Assche bart.vanassche@wdc.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Jeffle Xu jefflexu@linux.alibaba.com --- drivers/block/aoe/aoe.h | 1 - drivers/block/aoe/aoeblk.c | 21 +++++++-------------- drivers/block/aoe/aoedev.c | 1 - 3 files changed, 7 insertions(+), 16 deletions(-)

diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h index c0ebda1283cc..015c68017a1c 100644 --- a/drivers/block/aoe/aoe.h +++ b/drivers/block/aoe/aoe.h @@ -201,7 +201,6 @@ int aoeblk_init(void); void aoeblk_exit(void); void aoeblk_gdalloc(void *); void aoedisk_rm_debugfs(struct aoedev *d); -void aoedisk_rm_sysfs(struct aoedev *d);

int aoechr_init(void); void aoechr_exit(void); diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c index 429ebb84b592..ff770e7d9e52 100644 --- a/drivers/block/aoe/aoeblk.c +++ b/drivers/block/aoe/aoeblk.c @@ -177,10 +177,15 @@ static struct attribute *aoe_attrs[] = { NULL, };

-static const struct attribute_group attr_group = { +static const struct attribute_group aoe_attr_group = { .attrs = aoe_attrs, };

+static const struct attribute_group *aoe_attr_groups[] = { + &aoe_attr_group, + NULL, +}; + static const struct file_operations aoe_debugfs_fops = { .open = aoe_debugfs_open, .read = seq_read, @@ -219,17 +224,6 @@ aoedisk_rm_debugfs(struct aoedev *d) d->debugfs = NULL; }

-static int -aoedisk_add_sysfs(struct aoedev *d) -{ - return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group); -} -void -aoedisk_rm_sysfs(struct aoedev *d) -{ - sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group); -} - static int aoeblk_open(struct block_device *bdev, fmode_t mode) { @@ -417,8 +411,7 @@ aoeblk_gdalloc(void *vp)

spin_unlock_irqrestore(&d->lock, flags);

- add_disk(gd); - aoedisk_add_sysfs(d); + device_add_disk(NULL, gd, aoe_attr_groups); aoedisk_add_debugfs(d);

spin_lock_irqsave(&d->lock, flags); diff --git a/drivers/block/aoe/aoedev.c b/drivers/block/aoe/aoedev.c index 41060e9cedf2..f29a140cdbc1 100644 --- a/drivers/block/aoe/aoedev.c +++ b/drivers/block/aoe/aoedev.c @@ -275,7 +275,6 @@ freedev(struct aoedev *d) del_timer_sync(&d->timer); if (d->gd) { aoedisk_rm_debugfs(d); - aoedisk_rm_sysfs(d); del_gendisk(d->gd); put_disk(d->gd); blk_cleanup_queue(d->blkq);

-- 2.27.0

Jeffle Xu

9:28 a.m.

New subject: [PATCH v2 4.19 5/6] zram: register default groups with device_add_disk()

From: Hannes Reinecke hare@suse.de

commit 98af4d4df889dcea3bc0ce6b8a04759658ba8826 upstream.

Signed-off-by: Hannes Reinecke hare@suse.com Cc: Minchan Kim minchan@kernel.org Cc: Nitin Gupta ngupta@vflare.org Reviewed-by: Christoph Hellwig hch@lst.de Reviewed-by: Bart Van Assche bart.vanassche@wdc.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Jeffle Xu jefflexu@linux.alibaba.com --- drivers/block/zram/zram_drv.c | 28 +++++++--------------------- 1 file changed, 7 insertions(+), 21 deletions(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index dfc53619dcdd..b32da655ec30 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1644,6 +1644,11 @@ static const struct attribute_group zram_disk_attr_group = { .attrs = zram_disk_attrs, };

+static const struct attribute_group *zram_disk_attr_groups[] = { + &zram_disk_attr_group, + NULL, +}; + /* * Allocate and initialize new zram device. the function returns * '>= 0' device_id upon success, and negative value otherwise. @@ -1724,24 +1729,14 @@ static int zram_add(void)

zram->disk->queue->backing_dev_info->capabilities |= (BDI_CAP_STABLE_WRITES | BDI_CAP_SYNCHRONOUS_IO); - add_disk(zram->disk); - - ret = sysfs_create_group(&disk_to_dev(zram->disk)->kobj, - &zram_disk_attr_group); - if (ret < 0) { - pr_err("Error creating sysfs group for device %d\n", - device_id); - goto out_free_disk; - } + device_add_disk(NULL, zram->disk, zram_disk_attr_groups); + strlcpy(zram->compressor, default_compressor, sizeof(zram->compressor));

zram_debugfs_register(zram); pr_info("Added device: %s\n", zram->disk->disk_name); return device_id;

-out_free_disk: - del_gendisk(zram->disk); - put_disk(zram->disk); out_free_queue: blk_cleanup_queue(queue); out_free_idr: @@ -1770,15 +1765,6 @@ static int zram_remove(struct zram *zram) mutex_unlock(&bdev->bd_mutex);

zram_debugfs_unregister(zram); - /* - * Remove sysfs first, so no one will perform a disksize - * store while we destroy the devices. This also helps during - * hot_remove -- zram_reset_device() is the last holder of - * ->init_lock, no later/concurrent disksize_store() or any - * other sysfs handlers are possible. - */ - sysfs_remove_group(&disk_to_dev(zram->disk)->kobj, - &zram_disk_attr_group);

/* Make sure all the pending I/O are finished */ fsync_bdev(bdev);

-- 2.27.0

Jeffle Xu

9:28 a.m.

New subject: [PATCH v2 4.19 6/6] virtio-blk: modernize sysfs attribute creation

From: Hannes Reinecke hare@suse.de

commit e982c4d0a29b1d61fbe7716a8dcf8984936d6730 upstream.

Use new-style DEVICE_ATTR_RO/DEVICE_ATTR_RW to create the sysfs attributes and register the disk with default sysfs attribute groups.

Signed-off-by: Hannes Reinecke hare@suse.com Reviewed-by: Christoph Hellwig hch@lst.de Acked-by: Michael S. Tsirkin mst@redhat.com Reviewed-by: Bart Van Assche bart.vanassche@wdc.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Jeffle Xu jefflexu@linux.alibaba.com --- drivers/block/virtio_blk.c | 68 ++++++++++++++++++++++---------------- 1 file changed, 39 insertions(+), 29 deletions(-)

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index e03e13a3f32c..c2d9459ec5d1 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -423,8 +423,8 @@ static int minor_to_index(int minor) return minor >> PART_BITS; }

-static ssize_t virtblk_serial_show(struct device *dev, - struct device_attribute *attr, char *buf) +static ssize_t serial_show(struct device *dev, + struct device_attribute *attr, char *buf) { struct gendisk *disk = dev_to_disk(dev); int err; @@ -443,7 +443,7 @@ static ssize_t virtblk_serial_show(struct device *dev, return err; }

-static DEVICE_ATTR(serial, 0444, virtblk_serial_show, NULL); +static DEVICE_ATTR_RO(serial);

/* The queue's logical block size must be set before calling this */ static void virtblk_update_capacity(struct virtio_blk *vblk, bool resize) @@ -619,8 +619,8 @@ static const char *const virtblk_cache_types[] = { };

static ssize_t -virtblk_cache_type_store(struct device *dev, struct device_attribute *attr, - const char *buf, size_t count) +cache_type_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) { struct gendisk *disk = dev_to_disk(dev); struct virtio_blk *vblk = disk->private_data; @@ -638,8 +638,7 @@ virtblk_cache_type_store(struct device *dev, struct device_attribute *attr, }

static ssize_t -virtblk_cache_type_show(struct device *dev, struct device_attribute *attr, - char *buf) +cache_type_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gendisk *disk = dev_to_disk(dev); struct virtio_blk *vblk = disk->private_data; @@ -649,12 +648,38 @@ virtblk_cache_type_show(struct device *dev, struct device_attribute *attr, return snprintf(buf, 40, "%s\n", virtblk_cache_types[writeback]); }

-static const struct device_attribute dev_attr_cache_type_ro = - __ATTR(cache_type, 0444, - virtblk_cache_type_show, NULL); -static const struct device_attribute dev_attr_cache_type_rw = - __ATTR(cache_type, 0644, - virtblk_cache_type_show, virtblk_cache_type_store); +static DEVICE_ATTR_RW(cache_type); + +static struct attribute *virtblk_attrs[] = { + &dev_attr_serial.attr, + &dev_attr_cache_type.attr, + NULL, +}; + +static umode_t virtblk_attrs_are_visible(struct kobject *kobj, + struct attribute *a, int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct gendisk *disk = dev_to_disk(dev); + struct virtio_blk *vblk = disk->private_data; + struct virtio_device *vdev = vblk->vdev; + + if (a == &dev_attr_cache_type.attr && + !virtio_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) + return S_IRUGO; + + return a->mode; +} + +static const struct attribute_group virtblk_attr_group = { + .attrs = virtblk_attrs, + .is_visible = virtblk_attrs_are_visible, +}; + +static const struct attribute_group *virtblk_attr_groups[] = { + &virtblk_attr_group, + NULL, +};

static int virtblk_init_request(struct blk_mq_tag_set *set, struct request *rq, unsigned int hctx_idx, unsigned int numa_node) @@ -858,24 +883,9 @@ static int virtblk_probe(struct virtio_device *vdev) virtblk_update_capacity(vblk, false); virtio_device_ready(vdev);

- device_add_disk(&vdev->dev, vblk->disk, NULL); - err = device_create_file(disk_to_dev(vblk->disk), &dev_attr_serial); - if (err) - goto out_del_disk; - - if (virtio_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) - err = device_create_file(disk_to_dev(vblk->disk), - &dev_attr_cache_type_rw); - else - err = device_create_file(disk_to_dev(vblk->disk), - &dev_attr_cache_type_ro); - if (err) - goto out_del_disk; + device_add_disk(&vdev->dev, vblk->disk, virtblk_attr_groups); return 0;

-out_del_disk: - del_gendisk(vblk->disk); - blk_cleanup_queue(vblk->disk->queue); out_free_tags: blk_mq_free_tag_set(&vblk->tag_set); out_put_disk:

-- 2.27.0

Greg KH

7 Mar 7 Mar

3:16 p.m.

On Tue, Feb 23, 2021 at 05:28:53PM +0800, Jeffle Xu wrote:

...

Please refer to v1 ([1]) and background ([2]) for more details.

As Sasha suggested in [3], revert commit 9e07f4e24379 ("zram: close udev startup race condition as default groups") first, and then apply the original patch set.

patch 5: fix the issue of zram that the original commit (9e07f4e24379)

wants to fix

patch 6: fix the issue of virtio-blk ([2])

patch 3/4: I have not occured with these two issues in real world. Put here just for completeness.

This patch set is for 4.19, though it shall be backported to 4.4/4.9/4.14/4.19. Send this patch set out first for more feedbacks.

I have only tested the issue of virtio-blk though.

Look sane enough for me, now queued up, thanks.

greg k-h

1154

days inactive

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days old

linux-stable-mirror@lists.linaro.org

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Greg KH
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