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blkdev_report_zones_ioctl(): Use vmalloc() to allocate large buffers 

commit 327ea4adcf upstream.

Avoid that complaints similar to the following appear in the kernel log
if the number of zones is sufficiently large:

  fio: page allocation failure: order:9, mode:0x140c0c0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), nodemask=(null)
  Call Trace:
  dump_stack+0x63/0x88
  warn_alloc+0xf5/0x190
  __alloc_pages_slowpath+0x8f0/0xb0d
  __alloc_pages_nodemask+0x242/0x260
  alloc_pages_current+0x6a/0xb0
  kmalloc_order+0x18/0x50
  kmalloc_order_trace+0x26/0xb0
  __kmalloc+0x20e/0x220
  blkdev_report_zones_ioctl+0xa5/0x1a0
  blkdev_ioctl+0x1ba/0x930
  block_ioctl+0x41/0x50
  do_vfs_ioctl+0xaa/0x610
  SyS_ioctl+0x79/0x90
  do_syscall_64+0x79/0x1b0
  entry_SYSCALL_64_after_hwframe+0x3d/0xa2

Fixes: 3ed05a987e ("blk-zoned: implement ioctls")
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Shaun Tancheff <shaun.tancheff@seagate.com>
Cc: Damien Le Moal <damien.lemoal@hgst.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Bart Van Assche 2018-05-22 08:27:22 -07:00 committed by Greg Kroah-Hartman
parent d02ae00ab6
commit 1cbd5ece05
1 changed files with 6 additions and 2 deletions
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8
block/blk-zoned.c
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@ -286,7 +286,11 @@ int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
if (!rep.nr_zones)
return -EINVAL;
zones = kcalloc(rep.nr_zones, sizeof(struct blk_zone), GFP_KERNEL);
if (rep.nr_zones > INT_MAX / sizeof(struct blk_zone))
return -ERANGE;
zones = kvmalloc(rep.nr_zones * sizeof(struct blk_zone),
GFP_KERNEL | __GFP_ZERO);
if (!zones)
return -ENOMEM;
@ -308,7 +312,7 @@ int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
}
out:
kfree(zones);
kvfree(zones);
return ret;
}