rbd: don't take extra bio reference for osd client
Currently, if the OSD client finds an osd request has had a bio list attached to it, it drops a reference to it (or rather, to the first entry on that list) when the request is released. The code that added that reference (i.e., the rbd client) is therefore required to take an extra reference to that first bio structure. The osd client doesn't really do anything with the bio pointer other than transfer it from the osd request structure to outgoing (for writes) and ingoing (for reads) messages. So it really isn't the right place to be taking or dropping references. Furthermore, the rbd client already holds references to all bio structures it passes to the osd client, and holds them until the request is completed. So there's no need for this extra reference whatsoever. So remove the bio_put() call in ceph_osdc_release_request(), as well as its matching bio_get() call in rbd_osd_req_create(). This change could lead to a crash if old libceph.ko was used with new rbd.ko. Add a compatibility check at rbd initialization time to avoid this possibilty. This resolves: http://tracker.ceph.com/issues/3798 and http://tracker.ceph.com/issues/3799 Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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@ -1342,7 +1342,6 @@ static struct ceph_osd_request *rbd_osd_req_create(
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case OBJ_REQUEST_BIO:
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rbd_assert(obj_request->bio_list != NULL);
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osd_req->r_bio = obj_request->bio_list;
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bio_get(osd_req->r_bio);
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/* osd client requires "num pages" even for bio */
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osd_req->r_num_pages = calc_pages_for(offset, length);
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break;
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@ -4149,6 +4148,11 @@ int __init rbd_init(void)
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{
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int rc;
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if (!libceph_compatible(NULL)) {
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rbd_warn(NULL, "libceph incompatibility (quitting)");
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return -EINVAL;
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}
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rc = rbd_sysfs_init();
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if (rc)
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return rc;
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@ -39,7 +39,7 @@
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*/
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bool libceph_compatible(void *data)
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{
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return false;
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return true;
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}
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EXPORT_SYMBOL(libceph_compatible);
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@ -147,10 +147,6 @@ void ceph_osdc_release_request(struct kref *kref)
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if (req->r_own_pages)
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ceph_release_page_vector(req->r_pages,
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req->r_num_pages);
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#ifdef CONFIG_BLOCK
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if (req->r_bio)
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bio_put(req->r_bio);
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#endif
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ceph_put_snap_context(req->r_snapc);
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ceph_pagelist_release(&req->r_trail);
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if (req->r_mempool)
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