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| author | Alex Elder <elder@inktank.com> | 2013-03-12 08:34:22 +0400 |
|---|---|---|
| committer | Sage Weil <sage@inktank.com> | 2013-05-02 08:17:24 +0400 |
| commit | 25aff7c559c8b54a810bc094d59fe037cfed6b18 (patch) | |
| tree | 93db1b7a4941ab629abc36e31f8af51aa134aa3e /include | |
| parent | 28a89ddece39890c255a0c41baf622731a08c288 (diff) | |
| download | linux-25aff7c559c8b54a810bc094d59fe037cfed6b18.tar.xz | |
libceph: record residual bytes for all message data types
All of the data types can use this, not just the page array. Until
now, only the bio type doesn't have it available, and only the
initiator of the request (the rbd client) is able to supply the
length of the full request without re-scanning the bio list. Change
the cursor init routines so the length is supplied based on the
message header "data_len" field, and use that length to intiialize
the "resid" field of the cursor.
In addition, change the way "last_piece" is defined so it is based
on the residual number of bytes in the original request. This is
necessary (at least for bio messages) because it is possible for
a read request to succeed without consuming all of the space
available in the data buffer.
This resolves:
http://tracker.ceph.com/issues/4427
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/ceph/messenger.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/ceph/messenger.h b/include/linux/ceph/messenger.h index 0e4536cc46f0..459e55280bf8 100644 --- a/include/linux/ceph/messenger.h +++ b/include/linux/ceph/messenger.h @@ -95,6 +95,7 @@ static __inline__ bool ceph_msg_data_type_valid(enum ceph_msg_data_type type) } struct ceph_msg_data_cursor { + size_t resid; /* bytes not yet consumed */ bool last_piece; /* now at last piece of data item */ union { #ifdef CONFIG_BLOCK @@ -105,7 +106,6 @@ struct ceph_msg_data_cursor { }; #endif /* CONFIG_BLOCK */ struct { /* pages */ - size_t resid; /* bytes from array */ unsigned int page_offset; /* offset in page */ unsigned short page_index; /* index in array */ unsigned short page_count; /* pages in array */ |