[SSI] openssi ChangeLog,1.237,1.238

Update of /cvsroot/ssic-linux/openssi
In directory fdv4jf1.ch3.sourceforge.com:/tmp/cvs-serv26185

Modified Files:
      Tag: OPENSSI-FC
	ChangeLog 
Log Message:
Update for 2009/03/24 checkin


Index: ChangeLog
===================================================================
RCS file: /cvsroot/ssic-linux/openssi/ChangeLog,v
retrieving revision 1.237
retrieving revision 1.238
diff -u -d -r1.237 -r1.238
--- ChangeLog	24 Mar 2009 04:32:56 -0000	1.237
+++ ChangeLog	19 May 2009 06:44:02 -0000	1.238
@@ -1,6 +1,205 @@
-2009/03/??	*** Release of OpenSSI 1.9.6 ***
+2009/06/??	*** Release of OpenSSI 1.9.6 ***
+
+2009/03/28	rogertsang <[email protected]>
 
 2009/03/24	rogertsang <[email protected]>
+	* CFS:
+	- Disable cfs_is_subdir(); redundant and unsafe dereferencing of ancestors. (#ifndef CFS_ZAP_CACHES)
+	- Fix cfs_rb_delayedunlinks() race with VFS; missing parent i_sem.
+	- Optimize away directory i_op->permission cfs_permission(); there is already a recheck after token hold.
+	- cfs_sb_start_haves() no longer shrink parent dcache; nodedown should not race with remove/rename in SSI.
+	- cfs_rb_do_phase() now requires successful igrab() of superblock root inode before getting MHOLD list.
+	- cfs_readdir_filler(), uncached_readdir() set CFS_INO_INVALID_ATIME flag on success.
+	- cfs_rename() skip redundant checks already done in Linux VFS.
+	- cfs_delete_inode() re-enable truncate_inode_pages() call. John Hughes
+	  verified this call is needed on linux-2.6.14 or OOPS in clear_inode (nr_pages != 0)
+	  when renaming. However we have not seen this on linux-2.6.11.
+	- Fix cfs_clear_inode() cnode race; bogus pointer to svrcfstok structure.
+	- svrtok_dorelse() no longer call shrink_dcache_parent(); done in base.
+
+	* CFS (#ifdef CFS_EXPORT_OPS):
+	- Fix bogus iget5_locked() return value due to cfs_find_actor() not testing CFS file handle.
+	- clifhtoip() to use ilookup5() to support PFS where inode number is not unique.
+	- When generating RPC response instead of copying the whole cfs_fh structure only copy the used portion.
+	- When comparing CFS file handles we no longer inspect the possibly unused portion of cfs_fh structure.
+	- New CFS_FH_LEN macro determines actual size of CFS file handle stored in cfs_fh structure.
+	- Optimize svrhash() to no longer traverse padded (unused) portion of cfs_fh structure.
+	- cfs_get_dentry() now uses clifhtoip() to support PFS where inode number is not unique.
+
+	* CFS (#ifdef CFS_FH_TO_DENTRY_ANON):
+	- Remove #ifdef CFS_DECODE_FH deprecated by cfs_fhtohp().
+	- Refactor cfs_fhtohp(). Optimize away makehp() and call svrtok_lookup() directly.
+	- Create __cfs_get_dentry(). Returns a dentry given its superblock and CFS file handle.
+	- cfsd_proc_haverpc_0() no longer calls d_alloc_root().
+
+	* CFS (#ifdef CFS_INTR):
+	- Add support for interruptible non-chard CFS. The MI_INTR flag is set when enabled.
+	- New cfs_clnt_sigmask() / cfs_clnt_sigunmask() are used to ignore various signals.
+
+	* CFS (#ifdef CFS_BDI):
+	- Fix [ ssic-linux-Bugs-1811510 ] deadlock on loop mounted fs. CFS mounts get their own backing_dev_info structure.
+
+	* CFS (#ifdef RCU_CFSTOK_TABLE):
+	- Optimize away svrtok_lookup(); call hfind() directly.
+
+	* CFS (#ifndef CFS_VFSMOUNT_RACE_FIX):
+	- Fix race; bogus struct vfsmount.
+	- Fix semi-deadlock; mnt_fix_devname() might sleep while in atomic (holding vfsmount_lock).
+
+	* CFS (#ifdef SVRCFSTOK_SCT_FLAGS_NOLOCK):
+	- Regression:
+	  - Test for CFS_NOTOKENCACHE flag in cfstok_putiflags().
+
+	* CFS (#ifdef KERNEL2616_53):
+	- Migrate to CFS_MAX_FILE_IO_SIZE. Note 64KB limit due to ICS OOL message size (see ci-linux).
+	- cfs_lookup_revalidate() no longer ignore failure to revalidate parent dentry.
+	- Re-enable cfs_is_exclusive_create().
+	- cfs_lookup() optimize away remote lookup.
+	- cfs_link() i_count reference count bug fix.
+	- cfs_rename()
+	  - i_nlink count bug fix.
+	  - skip revalidation of old and new dentries before RPC; depends on #define CFS_ZAP_CACHES.
+	  - unhash and if possible mark negative the new dentry of file to be renamed.
+	- cfs_permission() optimize away write operations.
+	- cfs_lock() get lock to try local locking before going to server.
+	- Add cfs_flock(). Simulate flock() locks using posix locks. (#ifdef CFS_FLOCK)
+	- Convert cnode flags to bit ops. (#ifdef CFS_FLAGS_BITOPS) [incomplete]
+
+	* CFS (#ifdef SVRTOK_KMEM_CACHE):
+	- Fix uninitialized wan_flags and/or wan_done in nrwant structure.
+
+	* CFS (#ifdef NRSVRFIFO_LINUX_LIST):
+	- Remove redundant struct nrwant ->wan_list initialization.
+
+	* CFS (#ifdef CFS_PAGEVEC):
+	- By default we no longer avoid remote scatter/gather I/O. To re-enable
+	  this feature define CFS_PAGEVEC_BUFFER_READ and CFS_PAGEVEC_BUFFER_WRITE.
+
+	* CFS (#ifdef CFSTOK_INTR):
+	- Experimental interruptible token architecture is disabled for now
+	  until we fix the req_release race brought on by kernel preemption.
+
+	* ICS:
+	- Regression:
+	  - nsc_async_entry_alloc() semi-deadlock; might sleep inside interrupt context. (#ifdef NSC_ASYNC_ENTRY_KMEM_CACHE)
+
+	* ICS for TCP/IP (#ifdef LINUX_SSI_EVENT):
+	- Poll for nodeinfo event in icscli_llsend() in case nodeinfo raced on SMP.
+	  However later analysis did not identify the race. This should be reverted.
+
+	* IPC:
+	- Fix [ ssic-linux-Bugs-2719607 ] memory leak in ipcname_gettotal() path; based on patch from John Hughes (hughesj).
+
+	* PROCFS:
+	- Disable mem_write() a potential security hazard; disabled by default in base.
+	- Optimize away calls to PVPOP_PROCFS_GETATTR(), VPROC_RELE(), vproc_is_alive() or process_is_alive().
+	- proc_pid_make_inode()
+	  - optimize away vproc lookup; callers already have vproc.
+	  - new requirement for callers to hold VPROC movement lock except when process is migrating in.
+	  - check whether process is alive; callers expect us to do this check now.
+	  - obtain tgid for caller; negligible overhead since we are already getting attributes.
+	- proc_pid_lookup() optimize away remote pid alive re-check; instead rely on revalidate.
+	  The old implementation skips this remote pid alive check too. (#ifdef VPROC_IS_ALIVE)
+	- Fix proc_task_readdir() race with process migration.
+	- Optimize away VPROC LOCK in do_proc_links() path since caller has task_struct.
+	- New macros PROC_CLUSTER_NODELIST_START and PROC_CLUSTER_NODELIST_END
+	  consolidate redundant code for "mapping" while block to cluster.
+	- Use proc_match() from base instead of doing this buggy memory compare with MAX(x,y).
+	- Regression:
+	  - pid_delete_dentry(); those of zombies in dentry lru list. (#ifdef VPROC_HOLD_ZERO_GET_TASK)
+
+	* PROCFS (#ifdef PROC_LARGE_MAXPIDS):
+	- Optimize proc_pid_readdir() for default/cluster view.
+	- Increase PROC_MAXPIDS from 20 to 8192 or VPROC_MAXPIDS.
+	- For performnace we no longer initialize the pid_list buffer when allocating struct proc_root_readdir_cookie.
+
+	* PROCFS (#ifdef PROC_CLUSTER_DIR_ENTRY_FIX):
+	- Fix proc_dir_entry race ...
+	  - in do_proc_links() calling proc_pid_readlink() without holding BKL.
+	  - missing BKL in proc_cluster_readdir(), loadlevel_write_proc(),
+	    proc_cluster_node_init(), and proc_cluster_lookup().
+	- Fix loadlevel_write_proc() unlikely but possible dentry race during backward path walk.
+	- Optimize away xlate_proc_name() path walk in proc_cluster_node_init().
+	- proc_cluster_lookup()
+	  - handle proc_mkdir() failure.
+	  - return alias of dentry if possible (unlikely without proc_cluster_revalidate).
+
+	* SSI:
+	- do_write_loadlist() fixes. (#ifdef WRITE_LOADLIST_FIX)
+	  - Increase 80 character buffer to PATH_MAX (4096).
+	  - Skip empty lines.
+	  - Skip duplicate entries when appending.
+	  - Optimize away kmalloc.
+	- Remove d_purge_aliases() which could race; instead use d_prune_aliases() from base.
+	- Eliminate ssidev_poll_cli_t->pc_spinlock in sys_poll()/select() path. (#ifdef RCU_SSIDEV_POLL_CLI_LIST)
+	- Add ssidev_poll_cli_ctor() constructor for struct ssidev_poll_cli_t. (#ifdef SSIDEV_POLL_CLI_KMEM_CACHE)
+	- Fix rw_verify_area() fails when doing remote I/O. File position was not updated. (#ifdef SSI_RW_VERIFY_AREA_FIX)
+	- New ssi_mask_signals() / ssi_unmask_signals() based on Linux rpc_clnt_sigmask(). (#ifdef LINUX_SSI_INTERRUPTIBLE)
+	- ssi_wait_event() is no longer inlined.
+	- Regression:
+	  - size of kzmalloc() bound by array size INT_MAX in kcalloc().
+
+	* VPROC:
+	- Fix possible pvp_pproc race. Set pvp_pproc before adding vproc to the vproc hash chain.
+	- vproc_alloc() now sets vproc reference count to 1; save callers one VPROC_HOLD. (#ifdef VPROC_RELEASE__REFCNT_RACE_FIX)
+	- Fix dvp_set_exec() and dvp_clear_exec() race with is_loadlevelable() over pvp_comm_de and pvp_comm_mnt.
+	- Allow preemption between vproc hash chain buckets. (#ifdef VPROC_RCU_LIST)
+	- Fix bogus procfs file->private_data after being freed in ssi_proc_root_release().
+	- Fix rexecve_server_setup() and migrate_server_setup() modifying task_struct without locking.
+	- Fix set_global_root() modifying task's fs_struct without proper locking.
+	- Clean up code in vprocptr().
+	- Fix ssisys_ignore_halfup() modifying pvproc flags without holding FLAG LOCK.
+	- Fix rcluster_get_mount()
+	  - traversing process namespace without locking.
+	  - dereferencing rootmnt (struct vfsmount) without holding reference count.
+	- Fix rproc_arch_data_unload_msg() could get preempted while modifying the TLS.
+	- Regression:
+	  - vproc_release() de-allocated struct vproc even when reference count got bumped; this was accidentally introduced
+	    during cleanup of RW vproc list lock. (#ifndef VPROC_LIST_SPINLOCK)
+
+	* VPROC (#ifdef LOADLEVEL_TABLE_LIST):
+	- is_loadlevelable() fixes.
+	  - dentry and vfsmount reference count bug.
+	  - semi-deadlock; might sleep while in atomic (holding tasklist_lock).
+
+	* VPROC (#ifdef SSI_LOOKUP_DENTRY_HASH) [incomplete]:
+	- Hash remote sockets or pipes by inode number instead of by name.
+	- ssi_lookup() no longer need to extract inode number from d_name.
+
+	* VPROC (#if __SSI_LOCK_DEBUG):
+	- For performance with VPROC_KMEM_CACHE we no longer de-init vproc,
+	  but to support __SSI_LOCK_DEBUG we must de-init vproc.
+	  Also later kernels removed slab destructors. Thanks to John Hughes
+	  for reporting issue. (See http://www.mail-archive.com/[email protected]/msg13529.html)
+
+	* VPROC (#ifdef LINUX_SSI_EVENT):
+	- Call VPROC_WAIT_EVENT_SIGNAL() instead of VPROC_WAIT_EVENT_BROADCAST() when appropriate. Base doesn't wake all.
+	- Optimize away unnecessary calls to ssi_block_signals() / ssi_unblock_signals() in ssi_wait_event().
+
+	* VPROC (#ifdef VPROC_HOLD_ZERO_GET_TASK):
+	- Fix PV_SYS flag not set in initialize_init_vproc().
+	- No longer need to hold VPROC LOCK ...
+	  - when dereferencing pvp_pproc pointer.
+	  - when calling PV_IS_ALIVE().
+	  - in pvpop_procfs_getattr() since there is no race with setpgid()/setsid().
+
+	* VPROC (#ifdef VPROC_LOCKING_CONTEXT_FIX):
+	- Fix various semi-deadlock's
+	  - vpop_setup_vproc_relations() might sleep while in atomic (holding FLAG LOCK).
+	  - vproc_origin_find_nolock() might sleep while in atomic (holding vproc_origin_list_lock)
+	    in vproc_origin_inform_surrogate() code path.
+	    - As a result vproc_origin_list is also serialized by vproc_origin_create_mutex.
+	  - get_node() might sleep in atomic (holding tasklist_lock) in ssi_tty_get_pgrp()
+	    code path rssi_tty_get_pgrp, ssi_get_tty, devpts_get_tty, get_node.
+	- Fix OOPS at new_encode_dev() bogus task->signal pointer after returning
+	  from ssi_tty_get_pgrp() in do_task_stat().
+	- New macros VOD_GET()/VOD_PUT() implement use of reference counts instead of
+	  shared read/write semaphore to track struct vproc_origin_data usage.
+
+	* VPROC (#ifdef VPROC_CARECOUNT_FIX):
+	- Fix memory leak; struct vproc_caredata leak.
+	- Kernel panic if in the unlikely case the value of vch_carecount in
+	  struct vproc_caredata is not size_t bound.
 
 	* Files in ci-linux project were modified (see ci/ChangeLog).
 FIXME some of these belong in ci-linux ChangeLog.
@@ -85,8 +284,8 @@
 
 2009/02/23	rogertsang <[email protected]>
 	* CFS:
-	- Fix cfsd_create() possible dentry leak or operating on dereferenced dentry.
-	- Fix possible server token table hash key race with PFS file handle data.
+	- Fix cfsd_create() dentry leak or operating on unreferenced dentry.
+	- Fix server token table hash key race with PFS file handle data.
 	- Further avoid ssi_get_super() to reduce contention. We don't cross mount points.
 	- Switch to Linux get_empty_filp() to get unused file structure for svrcfstok structure.
 	- Move redundant struct svrcfstok initialization to kmem cache constructor. (#ifdef SVRCFS_TOKEN_KMEM_CACHE)
@@ -605,7 +804,7 @@
 	- Upgrade vproc_list_lock mutex to shared read-write lock to reduce contention.
 	- Bug fix ssi_reset_loadlevel() skipped pid's.
 	- Bug fix possible tncvpd_scan() hang at vproc_release() for NSCVPD_DEBUG.
-	- SMP bug fix possible vproc_hash corruption due to chance of duplicate vproc release.
+	- SMP bug fix vproc_hash corruption due to duplicate vproc release.
 
 	(#ifdef VPROC_HASH_LIST) (Bug 1842982)
 


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