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authorSage Weil <sage@newdream.net>2010-11-09 12:40:00 -0800
committerSage Weil <sage@newdream.net>2010-11-09 12:43:17 -0800
commitc5c6b19d4b8f5431fca05f28ae9e141045022149 (patch)
tree0961d9aeee49f481134089ac5b93b7118cf3a34b /include/linux/ceph
parentb7495fc2ff941db6a118a93ab8d61149e3f4cef8 (diff)
ceph: explicitly specify page alignment in network messages
The alignment used for reading data into or out of pages used to be taken from the data_off field in the message header. This only worked as long as the page alignment matched the object offset, breaking direct io to non-page aligned offsets. Instead, explicitly specify the page alignment next to the page vector in the ceph_msg struct, and use that instead of the message header (which probably shouldn't be trusted). The alloc_msg callback is responsible for filling in this field properly when it sets up the page vector. Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'include/linux/ceph')
-rw-r--r--include/linux/ceph/messenger.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/ceph/messenger.h b/include/linux/ceph/messenger.h
index 5956d62c3057..a108b425fee2 100644
--- a/include/linux/ceph/messenger.h
+++ b/include/linux/ceph/messenger.h
@@ -82,6 +82,7 @@ struct ceph_msg {
struct ceph_buffer *middle;
struct page **pages; /* data payload. NOT OWNER. */
unsigned nr_pages; /* size of page array */
+ unsigned page_alignment; /* io offset in first page */
struct ceph_pagelist *pagelist; /* instead of pages */
struct list_head list_head;
struct kref kref;