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ceph: let osd client clean up for interrupted request 

In ceph_sync_write(), if a safe callback is supplied with a request,
and an error is returned by ceph_osdc_wait_request(), a block of
code is executed to remove the request from the unsafe writes list
and drop references to capabilities acquired just prior to a call to
ceph_osdc_wait_request().

The only function used for this callback is sync_write_commit(),
and it does *exactly* what that block of error handling code does.

Now in ceph_osdc_wait_request(), if an error occurs (due to an
interupt during a wait_for_completion_interruptible() call),
complete_request() gets called, and that calls the request's
safe_callback method if it's defined.

So this means that this cleanup activity gets called twice in this
case, which is erroneous (and in fact leads to a crash).

Fix this by just letting the osd client handle the cleanup in
the event of an interrupt.

This resolves one problem mentioned in:
    http://tracker.ceph.com/issues/4706

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com>
This commit is contained in:
Alex Elder 2013-04-15 11:18:01 -05:00 committed by Sage Weil
parent 0b93267252
commit 7d7d51ce14
1 changed files with 0 additions and 6 deletions
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6
fs/ceph/file.c
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@ -595,12 +595,6 @@ more:
}
ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
if (ret < 0 && req->r_safe_callback) {
spin_lock(&ci->i_unsafe_lock);
list_del_init(&req->r_unsafe_item);
spin_unlock(&ci->i_unsafe_lock);
ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
}
}
if (file->f_flags & O_DIRECT)