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ceph: fix rsize/wsize capping in ceph_direct_read_write()

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rsize/wsize cap should be applied before ceph_osdc_new_request() is
called.  Otherwise, if the size is limited by the cap instead of the
stripe unit, ceph_osdc_new_request() would setup an extent op that is
bigger than what dio_get_pages_alloc() would pin and add to the page
vector, triggering asserts in the messenger.

Cc: stable@vger.kernel.org
Fixes: 95cca2b44e ("ceph: limit osd write size")
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
This commit is contained in:
Ilya Dryomov 2018-05-03 16:10:09 +02:00
parent 75bc37fefc
commit 3a15b38fd2
1 changed files with 5 additions and 5 deletions
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10
fs/ceph/file.c
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@ -918,6 +918,11 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
size_t start = 0;
ssize_t len;
if (write)
size = min_t(u64, size, fsc->mount_options->wsize);
else
size = min_t(u64, size, fsc->mount_options->rsize);
vino = ceph_vino(inode);
req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
vino, pos, &size, 0,
@ -933,11 +938,6 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
break;
}
if (write)
size = min_t(u64, size, fsc->mount_options->wsize);
else
size = min_t(u64, size, fsc->mount_options->rsize);
len = size;
pages = dio_get_pages_alloc(iter, len, &start, &num_pages);
if (IS_ERR(pages)) {