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Add assertion to catch 0-count page

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Some network related block device uses tcp_sendpage, which doesn't
behave well when using 0-count page. Add assertion to catch them.

This has a runtime dependency on:
zfsonlinux/spl@ae16ed9 Fix crash when using ZFS on Ceph rbd

Signed-off-by: Chunwei Chen <tuxoko@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2277
This commit is contained in:
Chunwei Chen 2014-04-24 11:11:02 +08:00 committed by Brian Behlendorf
parent cdf37f0c59
commit 17584980b9
1 changed files with 7 additions and 0 deletions
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7
module/zfs/vdev_disk.c
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@ -484,6 +484,13 @@ bio_map(struct bio *bio, void *bio_ptr, unsigned int bio_size)
else
page = virt_to_page(bio_ptr);
/*
* Some network related block device uses tcp_sendpage, which
* doesn't behave well when using 0-count page, this is a
* safety net to catch them.
*/
ASSERT3S(page_count(page), >, 0);
if (bio_add_page(bio, page, size, offset) != size)
break;