Dave Chinner d0eb2f38b2 xfs: convert grant head manipulations to lockless algorithm ... The only thing that the grant lock remains to protect is the grant head manipulations when adding or removing space from the log. These calculations are already based on atomic variables, so we can already update them safely without locks. However, the grant head manpulations require atomic multi-step calculations to be executed, which the algorithms currently don't allow. To make these multi-step calculations atomic, convert the algorithms to compare-and-exchange loops on the atomic variables. That is, we sample the old value, perform the calculation and use atomic64_cmpxchg() to attempt to update the head with the new value. If the head has not changed since we sampled it, it will succeed and we are done. Otherwise, we rerun the calculation again from a new sample of the head. This allows us to remove the grant lock from around all the grant head space manipulations, and that effectively removes the grant lock from the log completely. Hence we can remove the grant lock completely from the log at this point. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de>		2010-12-21 12:29:14 +11:00
..
linux-2.6	xfs: introduce new locks for the log grant ticket wait queues	2010-12-21 12:29:01 +11:00
quota	xfs: use wait queues directly for the log wait queues	2010-12-21 12:09:01 +11:00
support	xfs: drop dmapi hooks	2010-07-26 13:16:33 -05:00
Kconfig	quota: Make QUOTACTL config be selected by its users	2010-10-05 12:16:37 +02:00
Makefile	xfs: simplify log item descriptor tracking	2010-07-26 13:16:34 -05:00
xfs_acl.h	xfs: constify xattr_handler	2010-05-21 18:31:19 -04:00
xfs_ag.h	xfs: convert pag_ici_lock to a spin lock	2010-12-16 17:08:41 +11:00
xfs_alloc_btree.c	xfs: remove the ->kill_root btree operation	2010-10-18 15:07:38 -05:00
xfs_alloc_btree.h
xfs_alloc.c	xfs: factor duplicate code in xfs_alloc_ag_vextent_near into a helper	2010-12-16 16:06:15 -06:00
xfs_alloc.h	xfs: do not use emums for flags used in tracing	2010-07-26 13:16:43 -05:00
xfs_arch.h
xfs_attr_leaf.c	xfs: use KM_NOFS for allocations during attribute list operations	2010-12-23 11:57:37 +11:00
xfs_attr_leaf.h
xfs_attr_sf.h	xfs: convert attr to use unsigned names	2010-01-20 10:47:48 +11:00
xfs_attr.c	xfs: remove xfs_buf wrappers	2010-10-18 15:08:07 -05:00
xfs_attr.h	xfs: convert attr to use unsigned names	2010-01-20 10:47:48 +11:00
xfs_bit.c
xfs_bit.h
xfs_bmap_btree.c	xfs: remove unneeded #include statements	2010-07-26 13:16:33 -05:00
xfs_bmap_btree.h	xfs: make several more functions static	2010-01-15 15:31:38 -06:00
xfs_bmap.c	xfs: delayed alloc blocks beyond EOF are valid after writeback	2010-12-01 07:40:20 -06:00
xfs_bmap.h	xfs: fix failed write truncation handling.	2010-12-01 07:40:19 -06:00
xfs_btree_trace.c
xfs_btree_trace.h	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_btree.c	xfs: connect up buffer reclaim priority hooks	2010-12-02 16:31:13 +11:00
xfs_btree.h	xfs: remove the ->kill_root btree operation	2010-10-18 15:07:38 -05:00
xfs_buf_item.c	xfs: consume iodone callback items on buffers as they are processed	2010-12-03 17:00:52 +11:00
xfs_buf_item.h	xfs: use struct list_head for the buf cancel table	2010-12-16 16:05:22 -06:00
xfs_da_btree.c	xfs: remove xfs_buf wrappers	2010-10-18 15:08:07 -05:00
xfs_da_btree.h	xfs: convert dirnameops to unsigned char names	2010-01-20 10:47:17 +11:00
xfs_dfrag.c	xfs: delayed alloc blocks beyond EOF are valid after writeback	2010-12-01 07:40:20 -06:00
xfs_dfrag.h	xfs: clean up inconsistent variable naming in xfs_swap_extent	2010-01-15 15:31:23 -06:00
xfs_dinode.h	xfs: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -05:00
xfs_dir2_block.c	xfs: fix gcc 4.6 set but not read and unused statement warnings	2010-07-26 13:16:51 -05:00
xfs_dir2_block.h
xfs_dir2_data.c	xfs: remove unneeded #include statements	2010-07-26 13:16:33 -05:00
xfs_dir2_data.h
xfs_dir2_leaf.c	xfs: remove xfs_buf wrappers	2010-10-18 15:08:07 -05:00
xfs_dir2_leaf.h
xfs_dir2_node.c	xfs: remove unneeded #include statements	2010-07-26 13:16:33 -05:00
xfs_dir2_node.h	xfs: make several more functions static	2010-01-15 15:31:38 -06:00
xfs_dir2_sf.c	xfs: remove unneeded #include statements	2010-07-26 13:16:33 -05:00
xfs_dir2_sf.h
xfs_dir2.c	xfs: split xfs_itrace_entry	2010-07-26 13:16:44 -05:00
xfs_dir2.h	xfs: make xfs_dir_cilookup_result use unsigned char	2010-01-20 10:47:25 +11:00
xfs_error.c	xfs: only run xfs_error_test if error injection is active	2010-12-01 07:40:20 -06:00
xfs_error.h	xfs: only run xfs_error_test if error injection is active	2010-12-01 07:40:20 -06:00
xfs_extfree_item.c	xfs: Pull EFI/EFD handling out from under the AIL lock	2010-12-20 11:59:49 +11:00
xfs_extfree_item.h	xfs: Pull EFI/EFD handling out from under the AIL lock	2010-12-20 11:59:49 +11:00
xfs_filestream.c	xfs: tell lockdep about parent iolock usage in filestreams	2010-11-10 12:00:48 -06:00
xfs_filestream.h	xfs: clean up filestreams helpers	2010-07-26 13:16:51 -05:00
xfs_fs.h	xfs: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -05:00
xfs_fsops.c	xfs: dynamic speculative EOF preallocation	2011-01-04 11:35:03 +11:00
xfs_fsops.h	xfs: dummy transactions should not dirty VFS state	2010-08-24 11:46:31 +10:00
xfs_ialloc_btree.c	xfs: remove the ->kill_root btree operation	2010-10-18 15:07:38 -05:00
xfs_ialloc_btree.h
xfs_ialloc.c	xfs: remove xfs_buf wrappers	2010-10-18 15:08:07 -05:00
xfs_ialloc.h
xfs_iget.c	xfs: convert pag_ici_lock to a spin lock	2010-12-16 17:08:41 +11:00
xfs_inode_item.c	xfs: remove all the inodes on a buffer from the AIL in bulk	2010-12-20 12:03:17 +11:00
xfs_inode_item.h	xfs: simplify inode to transaction joining	2010-07-26 13:16:36 -05:00
xfs_inode.c	xfs: connect up buffer reclaim priority hooks	2010-12-02 16:31:13 +11:00
xfs_inode.h	xfs: don't truncate prealloc from frequently accessed inodes	2010-12-23 12:02:31 +11:00
xfs_inum.h
xfs_iomap.c	xfs: dynamic speculative EOF preallocation	2011-01-04 11:35:03 +11:00
xfs_iomap.h	xfs: kill xfs_iomap	2010-12-16 16:05:51 -06:00
xfs_itable.c	xfs: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -05:00
xfs_itable.h	xfs: remove block number from inode lookup code	2010-06-24 11:35:17 +10:00
xfs_log_cil.c	xfs: use wait queues directly for the log wait queues	2010-12-21 12:09:01 +11:00
xfs_log_priv.h	xfs: convert grant head manipulations to lockless algorithm	2010-12-21 12:29:14 +11:00
xfs_log_recover.c	xfs: convert l_tail_lsn to an atomic variable.	2010-12-21 12:28:39 +11:00
xfs_log_recover.h	xfs: Clean up XFS_BLI_* flag namespace	2010-05-24 10:33:39 -05:00
xfs_log.c	xfs: convert grant head manipulations to lockless algorithm	2010-12-21 12:29:14 +11:00
xfs_log.h	xfs: remove the unused XFS_LOG_SLEEP and XFS_LOG_NOSLEEP flags	2010-07-26 13:16:38 -05:00
xfs_mount.c	xfs: convert pag_ici_lock to a spin lock	2010-12-16 17:08:41 +11:00
xfs_mount.h	xfs: dynamic speculative EOF preallocation	2011-01-04 11:35:03 +11:00
xfs_mru_cache.c	xfs: Kill filestreams cache flush	2010-01-15 15:34:22 -06:00
xfs_mru_cache.h	xfs: Kill filestreams cache flush	2010-01-15 15:34:22 -06:00
xfs_quota.h	xfs: fix a few compiler warnings with CONFIG_XFS_QUOTA=n	2010-11-10 12:00:48 -06:00
xfs_rename.c	xfs: log timestamp changes to the source inode in rename	2010-12-09 17:07:02 -06:00
xfs_rtalloc.c	xfs: use unhashed buffers for size checks	2010-10-18 15:07:50 -05:00
xfs_rtalloc.h	xfs: be more explicit if RT mount fails due to config	2010-05-28 14:58:24 -05:00
xfs_rw.c	xfs: remove unneeded #include statements	2010-07-26 13:16:33 -05:00
xfs_rw.h	xfs: only clear the suid bit once in xfs_write	2010-02-12 13:43:57 -06:00
xfs_sb.h	xfs: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -05:00
xfs_trans_ail.c	xfs: use AIL bulk delete function to implement single delete	2010-12-20 12:36:15 +11:00
xfs_trans_buf.c	xfs: remove xfs_buf wrappers	2010-10-18 15:08:07 -05:00
xfs_trans_extfree.c	xfs: Pull EFI/EFD handling out from under the AIL lock	2010-12-20 11:59:49 +11:00
xfs_trans_inode.c	xfs: don't use vfs writeback for pure metadata modifications	2010-10-18 15:07:45 -05:00
xfs_trans_priv.h	xfs: use AIL bulk delete function to implement single delete	2010-12-20 12:36:15 +11:00
xfs_trans_space.h
xfs_trans.c	xfs: bulk AIL insertion during transaction commit	2010-12-20 12:02:19 +11:00
xfs_trans.h	xfs: connect up buffer reclaim priority hooks	2010-12-02 16:31:13 +11:00
xfs_types.h	xfs: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -05:00
xfs_utils.c	xfs: remove xfs_cred.h	2010-10-18 15:08:06 -05:00
xfs_utils.h	xfs: remove xfs_cred.h	2010-10-18 15:08:06 -05:00
xfs_vnodeops.c	xfs: don't truncate prealloc from frequently accessed inodes	2010-12-23 12:02:31 +11:00
xfs_vnodeops.h	xfs: remove xfs_cred.h	2010-10-18 15:08:06 -05:00
xfs.h	xfs: event tracing support	2009-12-14 23:08:16 -06:00