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block-5.5-2020-01-26

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Merge tag 'block-5.5-2020-01-26' of git://git.kernel.dk/linux-block

Pull block fix from Jens Axboe:
 "Unfortunately this weekend we had a few last minute reports, one was
  for block.

  The partition disable for zoned devices was overly restrictive, it can
  work (and be supported) just fine for host-aware variants.

  Here's a fix ensuring that's the case so we don't break existing users
  of that"

* tag 'block-5.5-2020-01-26' of git://git.kernel.dk/linux-block:
  block: allow partitions on host aware zone devices
This commit is contained in:
Linus Torvalds 2020-01-26 12:12:36 -08:00
commit 9dbca16087
3 changed files with 39 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
block/partition-generic.c
View File

@ -321,6 +321,24 @@ struct hd_struct *add_partition(struct gendisk *disk, int partno,
const char *dname;
int err;
/*
* Partitions are not supported on zoned block devices that are used as
* such.
*/
switch (disk->queue->limits.zoned) {
case BLK_ZONED_HM:
pr_warn("%s: partitions not supported on host managed zoned block device\n",
disk->disk_name);
return ERR_PTR(-ENXIO);
case BLK_ZONED_HA:
pr_info("%s: disabling host aware zoned block device support due to partitions\n",
disk->disk_name);
disk->queue->limits.zoned = BLK_ZONED_NONE;
break;
case BLK_ZONED_NONE:
break;
}
err = disk_expand_part_tbl(disk, partno);
if (err)
return ERR_PTR(err);
@ -501,7 +519,7 @@ static bool blk_add_partition(struct gendisk *disk, struct block_device *bdev,
part = add_partition(disk, p, from, size, state->parts[p].flags,
&state->parts[p].info);
if (IS_ERR(part)) {
if (IS_ERR(part) && PTR_ERR(part) != -ENXIO) {
printk(KERN_ERR " %s: p%d could not be added: %ld\n",
disk->disk_name, p, -PTR_ERR(part));
return true;
@ -540,10 +558,10 @@ int blk_add_partitions(struct gendisk *disk, struct block_device *bdev)
}
/*
* Partitions are not supported on zoned block devices.
* Partitions are not supported on host managed zoned block devices.
*/
if (bdev_is_zoned(bdev)) {
pr_warn("%s: ignoring partition table on zoned block device\n",
if (disk->queue->limits.zoned == BLK_ZONED_HM) {
pr_warn("%s: ignoring partition table on host managed zoned block device\n",
disk->disk_name);
ret = 0;
goto out_free_state;

9
drivers/scsi/sd.c
View File

@ -2958,16 +2958,17 @@ static void sd_read_block_characteristics(struct scsi_disk *sdkp)
q->limits.zoned = BLK_ZONED_HM;
} else {
sdkp->zoned = (buffer[8] >> 4) & 3;
if (sdkp->zoned == 1)
if (sdkp->zoned == 1 && !disk_has_partitions(sdkp->disk)) {
/* Host-aware */
q->limits.zoned = BLK_ZONED_HA;
else
} else {
/*
* Treat drive-managed devices as
* regular block devices.
* Treat drive-managed devices and host-aware devices
* with partitions as regular block devices.
*/
q->limits.zoned = BLK_ZONED_NONE;
}
}
if (blk_queue_is_zoned(q) && sdkp->first_scan)
sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");

12
include/linux/genhd.h
View File

@ -245,6 +245,18 @@ static inline bool disk_part_scan_enabled(struct gendisk *disk)
!(disk->flags & GENHD_FL_NO_PART_SCAN);
}
static inline bool disk_has_partitions(struct gendisk *disk)
{
bool ret = false;
rcu_read_lock();
if (rcu_dereference(disk->part_tbl)->len > 1)
ret = true;
rcu_read_unlock();
return ret;
}
static inline dev_t disk_devt(struct gendisk *disk)
{
return MKDEV(disk->major, disk->first_minor);