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libceph: fix broken data length assertions

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It's OK for the result of a read to come back with fewer bytes than
were requested.  So don't trigger a BUG() in that case when
initializing the data cursor.

This resolves the first problem described in:
    http://tracker.ceph.com/issues/4598

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
This commit is contained in:
Alex Elder 2013-03-30 13:31:02 -05:00 • committed by Sage Weil
commit 1190bf06a6
1 changed files with 2 additions and 2 deletions
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4
net/ceph/messenger.c
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@ -833,7 +833,7 @@ static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data *data,
BUG_ON(!data->pages);
BUG_ON(!data->length);
BUG_ON(length != data->length);
BUG_ON(length > data->length); /* short reads are OK */
cursor->resid = length;
page_count = calc_pages_for(data->alignment, (u64)data->length);
@ -905,7 +905,7 @@ static void ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data *data,
pagelist = data->pagelist;
BUG_ON(!pagelist);
BUG_ON(length != pagelist->length);
BUG_ON(length > pagelist->length); /* short reads are OK */
if (!length)
return; /* pagelist can be assigned but empty */