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 <[email protected]>
Reviewed-by: Yan, Zheng <[email protected]>
---
fs/ceph/file.c | 6 ------
1 file changed, 6 deletions(-)
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index b7e6caa..1d8d430 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -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)
--
1.7.9.5
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