Fixes a deadlock that is triggered due to kswapd,
while the page was locked and the iput couldn't tear
down the address space.
Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>

Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>

Signed-off-by: Sage Weil <sage@newdream.net>

Signed-off-by: Sage Weil <sage@newdream.net>

If we explicitly close a connection, or there is a socket error, we need
to drop any partially received message.
Signed-off-by: Sage Weil <sage@newdream.net>

Also, print fsid using standard format, NOT hex dump.
Signed-off-by: Sage Weil <sage@newdream.net>

Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>

For lossy connections we drop all state on socket errors, so there is no
reason to keep sent ceph_msg's around.
Signed-off-by: Sage Weil <sage@newdream.net>

The server indicates whether a connection is lossy; set our LOSSYTX bit
appropriately.  Do not set lossy bit on outgoing connections.
Signed-off-by: Sage Weil <sage@newdream.net>

Signed-off-by: Sage Weil <sage@newdream.net>

Carry a ceph_msg reference for connection->out_msg.  This will allow us to
make out_sent optional.
Signed-off-by: Sage Weil <sage@newdream.net>

Fix leak of monc mutex on ENOMEM or bad fsid when receiving new mon map.
Audited all other users.
Signed-off-by: Sage Weil <sage@newdream.net>

Do not feed bad (large) device ids to CRUSH.
Signed-off-by: Sage Weil <sage@newdream.net>

Signed-off-by: Sage Weil <sage@newdream.net>

Signed-off-by: Sage Weil <sage@newdream.net>

Signed-off-by: Sage Weil <sage@newdream.net>

We never allocate the ceph_buffer and buffer separtely, so use a single
constructor.

Disallow put on NULL buffer; make the caller check.
Signed-off-by: Sage Weil <sage@newdream.net>

Signed-off-by: Sage Weil <sage@newdream.net>

Signed-off-by: Sage Weil <sage@newdream.net>

Signed-off-by: Sage Weil <sage@newdream.net>

There is certainly no reason not to report this.

The only real downside to allowing the user to set it is that you don't
get default values by zeroing the layout struct (the default is -1).
Signed-off-by: Sage Weil <sage@newdream.net>

We need to skip /.ceph in (cached) readdir results, and exclude "/.ceph"
from the cached ENOENT lookup check.
Signed-off-by: Sage Weil <sage@newdream.net>

Signed-off-by: Sage Weil <sage@newdream.net>

Fix leak of osd client request_mutex on receiving dup ack.
Signed-off-by: Sage Weil <sage@newdream.net>

ceph_lookup_snap_realm either returns a valid pointer or NULL; there is no
need to check IS_ERR(result).
Reported-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Sage Weil <sage@newdream.net>

If the NULL test is necessary, then the dereference should be moved below
the NULL test.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/).

// <smpl>
@@
type T;
expression E;
identifier i,fld;
statement S;
@@

- T i = E->fld;
+ T i;
  ... when != E
      when != i
  if (E == NULL) S
+ i = E->fld;
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Sage Weil <sage@newdream.net>

Error handling code following a kmalloc should free the allocated data.

The semantic match that finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r exists@
local idexpression x;
statement S;
expression E;
identifier f,f1,l;
position p1,p2;
expression *ptr != NULL;
@@

x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...);
...
if (x == NULL) S
<... when != x
     when != if (...) { <+...x...+> }
(
x->f1 = E
|
 (x->f1 == NULL || ...)
|
 f(...,x->f1,...)
)
...>
(
 return \(0\|<+...x...+>\|ptr\);
|
 return@p2 ...;
)

@script:python@
p1 << r.p1;
p2 << r.p2;
@@

print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line)
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Sage Weil <sage@newdream.net>

Left over from mount/auth protocol changes.
Signed-off-by: Sage Weil <sage@newdream.net>

Reset the backoff delay when we reopen the connection, so that the delays
for any initial connection problems are reasonable.  We were resetting only
after a successful handshake, which was of limited utility.
Signed-off-by: Sage Weil <sage@newdream.net>

The max_size increase request to the MDS can get lost during an MDS
restart and reconnect.  Reset our requested value after the MDS recovers,
so that any blocked writes will re-request a larger max_size upon waking.

Also, explicit wake session caps after the reconnect.  Normally the cap
renewal catches this, but not in the cases where the caps didn't go stale
in the first place, which would leave writers waiting on max_size asleep.
Signed-off-by: Sage Weil <sage@newdream.net>

Signed-off-by: Yehuda Sadeh <yehuda@newdream.net>

The mds map now uses the global_id as the 'key' (instead of the addr,
which was a poor choice).

This is protocol change.
Signed-off-by: Sage Weil <sage@newdream.net>

We may first learn our fsid from any of the mon, osd, or mds maps
(whichever the monitor sends first).  Consolidate checks in a single
helper.  Initialize the client debugfs entry then, since we need the
fsid (and global_id) for the directory name.

Also remove dead mount code.
Signed-off-by: Sage Weil <sage@newdream.net>

Signed-off-by: Sage Weil <sage@newdream.net>

Signed-off-by: Sage Weil <sage@newdream.net>

When we open a monitor session, we send an initial AUTH message listing
the auth protocols we support, our entity name, and (possibly) a previously
assigned global_id.  The monitor chooses a protocol and responds with an
initial message.

Initially implement AUTH_NONE, a dummy protocol that provides no security,
but works within the new framework.  It generates 'authorizers' that are
used when connecting to (mds, osd) services that simply state our entity
name and global_id.

This is a wire protocol change.
Signed-off-by: Sage Weil <sage@newdream.net>

Unwind initializing if we get ENOMEM during client initialization.
Signed-off-by: Sage Weil <sage@newdream.net>

We require that ceph_con_close be called before we drop the connection,
so this is unneeded.  Just BUG if con->sock != NULL.
Signed-off-by: Sage Weil <sage@newdream.net>

We want to ceph_con_close when we're done with the connection, before
the ref count reaches 0.  Once it does, do not call ceph_con_shutdown,
as that takes the con mutex and may sleep, and besides that is
unnecessary.
Signed-off-by: Sage Weil <sage@newdream.net>

We occasionally want to make a best-effort attempt to invalidate cache
pages without fear of blocking.  If this fails, we fall back to an async
invalidate in another thread.

Use invalidate_mapping_pages instead of invalidate_inode_page2, as that
will skip locked pages, and not deadlock.
Signed-off-by: Sage Weil <sage@newdream.net>