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  1. Mar 23, 2010
    • Sage Weil's avatar
      ceph: fix mds sync() race with completing requests · 80fc7314
      Sage Weil authored 
      

The wait_unsafe_requests() helper dropped the mdsc mutex to wait
for each request to complete, and then examined r_node to get the
next request after retaking the lock.  But the request completion
removes the request from the tree, so r_node was always undefined
at this point.  Since it's a small race, it usually led to a
valid request, but not always.  The result was an occasional
crash in rb_next() while dereferencing node->rb_left.

Fix this by clearing the rb_node when removing the request from
the request tree, and not walking off into the weeds when we
are done waiting for a request.  Since the request we waited on
will _always_ be out of the request tree, take a ref on the next
request, in the hopes that it won't be.  But if it is, it's ok:
we can start over from the beginning (and traverse over older read
requests again).

Signed-off-by: default avatarSage Weil <sage@newdream.net>
      80fc7314
    • Sage Weil's avatar
      ceph: only release unused caps with mds requests · 916623da
      Sage Weil authored 
      

We were releasing used caps (e.g. FILE_CACHE) from encode_inode_release
with MDS requests (e.g. setattr).  We don't carry refs on most caps, so
this code worked most of the time, but for setattr (utimes) we try to
drop Fscr.

This causes cap state to get slightly out of sync with reality, and may
result in subsequent mds revoke messages getting ignored.

Fix by only releasing unused caps.

Signed-off-by: default avatarSage Weil <sage@newdream.net>
      916623da
    • Sage Weil's avatar
      ceph: clean up handle_cap_grant, handle_caps wrt session mutex · 15637c8b
      Sage Weil authored 
      

Drop session mutex unconditionally in handle_cap_grant, and do the
check_caps from the handle_cap_grant helper.  This avoids using a magic
return value.

Also avoid using a flag variable in the IMPORT case and call
check_caps at the appropriate point.

Signed-off-by: default avatarSage Weil <sage@newdream.net>
      15637c8b
    • Sage Weil's avatar
      ceph: fix session locking in handle_caps, ceph_check_caps · cdc2ce05
      Sage Weil authored 
      

Passing a session pointer to ceph_check_caps() used to mean it would leave
the session mutex locked.  That wasn't always possible if it wasn't passed
CHECK_CAPS_AUTHONLY.   If could unlock the passed session and lock a
differet session mutex, which was clearly wrong, and also emitted a
warning when it a racing CPU retook it and we did an unlock from the wrong
context.

This was only a problem when there was more than one MDS.

First, make ceph_check_caps unconditionally drop the session mutex, so that
it is free to lock other sessions as needed.  Then adjust the one caller
that passes in a session (handle_cap_grant) accordingly.

Signed-off-by: default avatarSage Weil <sage@newdream.net>
      cdc2ce05
    • Sage Weil's avatar
      ceph: drop unnecessary WARN_ON in caps migration · 4ea0043a
      Sage Weil authored 
      

If we don't have the exported cap it's because we already released it. No
need to WARN.

Signed-off-by: default avatarSage Weil <sage@newdream.net>
      4ea0043a
    • Sage Weil's avatar
      ceph: fix null pointer deref of r_osd in debug output · 12eadc19
      Sage Weil authored 
      

This causes an oops when debug output is enabled and we kick
an osd request with no current r_osd (sometime after an osd
failure).  Check the pointer before dereferencing.

Signed-off-by: default avatarSage Weil <sage@newdream.net>
      12eadc19
    • Sage Weil's avatar
      ceph: clean up service ticket decoding · 0a990e70
      Sage Weil authored 
      

Previously we would decode state directly into our current ticket_handler.
This is problematic if for some reason we fail to decode, because we end
up with half new state and half old state.

We are probably already in bad shape if we get an update we can't decode,
but we may as well be tidy anyway.  Decode into new_* temporaries and
update the ticket_handler only on success.

Signed-off-by: default avatarSage Weil <sage@newdream.net>
      0a990e70
  3. Mar 21, 2010
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  9. Mar 15, 2010