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authorIlya Dryomov <ilya.dryomov@inktank.com>2014-08-08 12:43:39 +0400
committerIlya Dryomov <ilya.dryomov@inktank.com>2014-08-09 11:27:32 +0400
commit5f740d7e1531099b888410e6bab13f68da9b1a4d (patch)
treeb3e7b68b4b977cda4846432990a93ff5f27ec60b /Documentation
parent9584d5082653429ea219f9739a08566478b39f16 (diff)
libceph: set last_piece in ceph_msg_data_pages_cursor_init() correctly
Determining ->last_piece based on the value of ->page_offset + length is incorrect because length here is the length of the entire message. ->last_piece set to false even if page array data item length is <= PAGE_SIZE, which results in invalid length passed to ceph_tcp_{send,recv}page() and causes various asserts to fire. # cat pages-cursor-init.sh #!/bin/bash rbd create --size 10 --image-format 2 foo FOO_DEV=$(rbd map foo) dd if=/dev/urandom of=$FOO_DEV bs=1M &>/dev/null rbd snap create foo@snap rbd snap protect foo@snap rbd clone foo@snap bar # rbd_resize calls librbd rbd_resize(), size is in bytes ./rbd_resize bar $(((4 << 20) + 512)) rbd resize --size 10 bar BAR_DEV=$(rbd map bar) # trigger a 512-byte copyup -- 512-byte page array data item dd if=/dev/urandom of=$BAR_DEV bs=1M count=1 seek=5 The problem exists only in ceph_msg_data_pages_cursor_init(), ceph_msg_data_pages_advance() does the right thing. The size_t cast is unnecessary. Cc: stable@vger.kernel.org # 3.10+ Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com> Reviewed-by: Sage Weil <sage@redhat.com> Reviewed-by: Alex Elder <elder@linaro.org>
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