[SSI] openssi/kernel/mm shmem.c,1.9,1.10

Update of /cvsroot/ssic-linux/openssi/kernel/mm
In directory sfp-cvsdas-3.v30.ch3.sourceforge.com:/tmp/cvs-serv9483/kernel/mm

Modified Files:
      Tag: OPENSSI-FC
	shmem.c 
Log Message:
IPC:
- Fix partially initialized shmid_kernel_svr.shm_perm structure.
- Fix ipc/sem.c:exit_sem() GCC warning: ISO C90 forbids mixed declarations and
  code.
- Split ssi_shm_setup() into separate functions ssi_shm_setup_client/new() to
  reduce stack usage in some paths.

IPC (#ifdef IPC_SHM_RACE_FIX):
- Fix shm_svr_rmid() called without spinlock for the ID.
- Fix race deferencing invalid struct shmid_kernel, shmid_kernel_svr.
- Enable lockfree shmid_kernel_svr IPC id lookup. Use ipc_rcu_alloc and IPC
  reference counting.
- Reduce contention. Avoid the ipc_ids mutex. Use per IPC id spinlock.
- Fix cli_ipcname_findid() race with cli_ipcname_getid() could overwrite
  existing IPC segment.
- Fix non-critical section under shm_ids.sem lock in shm_create_cli_entry().
- Prevent re-acquire shm_ids.sem in shm_destroy() path. ripc_shm_rmid() no
  longer returns with shm_ids.sem unlocked.
- Remove contention in shmem_svr_lookup(); no longer acquire shm_ids_svr.sem.
- Fix do_shmat() possible hang calling dput() while holding spinlock.
- Fix cfs_shm_node_mnts[] race.
- Fix inode leak in ssi_shm_setup() error path when do_shm_register() fails.

IPC (#ifdef IPC_SHM_LOCK_DEST_FIX):
- Fix [ ssic-linux-Bug 2838006 ] Corrupt SHM_LOCK_DEST flag.
- Refactor ipc_shm_nodedown() for SHM_LOCK_DEST flag. Use SHM_LOCK_DEST flag.
- Fix ripc_drop_locks() error path dereferencing NULL pointer in
  ipc_drop_locks().

IPC (#ifdef CFS_IPCSHM_DENTRY):
- ssi_shm_setup_client() use d_instantiate_unique() to prevent duplicate
  entries.

 cluster/ssi/cfs/cfs_ipcshm.c     |  422 ++++++++++++++++++-----------
 cluster/ssi/cfs/cfsproc.c        |    6 
 cluster/ssi/ipc/ipcshm_svr.c     |  280 +++++++++++--------
 cluster/ssi/ipc/namesvr_func.c   |   12 
 cluster/ssi/vproc/reopen.c       |   30 +-
 include/cluster/ssi/cfs/cfs_fs.h |   16 +
 include/cluster/ssi/ipc/shm.h    |   13 
 include/linux/shm.h              |    7 
 ipc/msg.c                        |    6 
 ipc/sem.c                        |   17 -
 ipc/shm.c                        |  450 ++++++++++++++++++++-----------
 ipc/util.c                       |   18 -
 ipc/util.h                       |    5 
 mm/shmem.c                       |    9 
 14 files changed, 845 insertions(+), 446 deletions(-)


Index: shmem.c
===================================================================
RCS file: /cvsroot/ssic-linux/openssi/kernel/mm/shmem.c,v
retrieving revision 1.9
retrieving revision 1.10
diff -u -d -r1.9 -r1.10
--- shmem.c	7 Aug 2007 03:06:15 -0000	1.9
+++ shmem.c	5 Mar 2010 06:30:21 -0000	1.10
@@ -1245,7 +1245,11 @@
 	int retval = -ENOMEM;
 
 #ifdef CONFIG_SSI
+#ifdef IPC_SHM_RACE_FIX
+	if ((inode = shm_svr_grab_inode(inode->i_ino)) == NULL)
+#else
 	if ((inode = shm_svr_get_inode(inode->i_ino)) == NULL)
+#endif
 		return -EINVAL;
 #endif
 	info = SHMEM_I(inode);
@@ -1263,6 +1267,11 @@
 	retval = 0;
 out_nomem:
 	spin_unlock(&info->lock);
+#ifdef CONFIG_SSI
+#ifdef IPC_SHM_RACE_FIX
+	iput(inode);
+#endif
+#endif
 	return retval;
 }
 


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