Dave Chinner 1c1c6ebcf5 xfs: Replace per-ag array with a radix tree ... The use of an array for the per-ag structures requires reallocation of the array when growing the filesystem. This requires locking access to the array to avoid use after free situations, and the locking is difficult to get right. To avoid needing to reallocate an array, change the per-ag structures to an allocated object per ag and index them using a tree structure. The AGs are always densely indexed (hence the use of an array), but the number supported is 2^32 and lookups tend to be random and hence indexing needs to scale. A simple choice is a radix tree - it works well with this sort of index. This change also removes another large contiguous allocation from the mount/growfs path in XFS. The growing process now needs to change to only initialise the new AGs required for the extra space, and as such only needs to exclusively lock the tree for inserts. The rest of the code only needs to lock the tree while doing lookups, and hence this will remove all the deadlocks that currently occur on the m_perag_lock as it is now an innermost lock. The lock is also changed to a spinlock from a read/write lock as the hold time is now extremely short. To complete the picture, the per-ag structures will need to be reference counted to ensure that we don't free/modify them while they are still in use. This will be done in subsequent patch. Signed-off-by: Dave Chinner <david@fromorbit.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Alex Elder <aelder@sgi.com>		2010-01-15 15:33:52 -06:00
..
linux-2.6	xfs: rename xfs_get_perag	2010-01-15 15:33:02 -06:00
quota	xfs: reclaim inodes under a write lock	2010-01-15 13:43:55 -06:00
support	xfs: event tracing support	2009-12-14 23:08:16 -06:00
Kconfig	xfs: use generic Posix ACL code	2009-06-10 17:07:47 +02:00
Makefile	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_acl.h	sanitize xattr handler prototypes	2009-12-16 12:16:49 -05:00
xfs_ag.h	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_alloc_btree.c	xfs: Don't directly reference m_perag in allocation code	2010-01-15 15:33:12 -06:00
xfs_alloc_btree.h
xfs_alloc.c	xfs: Replace per-ag array with a radix tree	2010-01-15 15:33:52 -06:00
xfs_alloc.h	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_arch.h	xfs: use generic Posix ACL code	2009-06-10 17:07:47 +02:00
xfs_attr_leaf.c	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_attr_leaf.h
xfs_attr_sf.h	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_attr.c	xfs: make several more functions static	2010-01-15 15:31:38 -06:00
xfs_attr.h	xfs: make several more functions static	2010-01-15 15:31:38 -06:00
xfs_bit.c
xfs_bit.h
xfs_bmap_btree.c	xfs: make several more functions static	2010-01-15 15:31:38 -06:00
xfs_bmap_btree.h	xfs: make several more functions static	2010-01-15 15:31:38 -06:00
xfs_bmap.c	xfs: Replace per-ag array with a radix tree	2010-01-15 15:33:52 -06:00
xfs_bmap.h	xfs: event tracing support	2009-12-14 23:08:16 -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: event tracing support	2009-12-14 23:08:16 -06:00
xfs_btree.h	xfs: add more statics & drop some unused functions	2009-08-31 14:46:20 -05:00
xfs_buf_item.c	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_buf_item.h	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_da_btree.c	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_da_btree.h	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_dfrag.c	xfs: clean up inconsistent variable naming in xfs_swap_extent	2010-01-15 15:31:23 -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_dir2_block.c	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_dir2_block.h
xfs_dir2_data.c
xfs_dir2_data.h
xfs_dir2_leaf.c	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_dir2_leaf.h
xfs_dir2_node.c	xfs: make several more functions static	2010-01-15 15:31:38 -06:00
xfs_dir2_node.h	xfs: make several more functions static	2010-01-15 15:31:38 -06:00
xfs_dir2_sf.c	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_dir2_sf.h
xfs_dir2.c	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_dir2.h
xfs_dmapi.h
xfs_dmops.c
xfs_error.c
xfs_error.h
xfs_extfree_item.c
xfs_extfree_item.h
xfs_filestream.c	xfs: Replace per-ag array with a radix tree	2010-01-15 15:33:52 -06:00
xfs_filestream.h	xfs: Convert filestreams code to use per-ag get/put routines	2010-01-15 15:33:22 -06:00
xfs_fs.h	trivial: fix typo "for for" in multiple files	2009-09-21 15:14:54 +02:00
xfs_fsops.c	xfs: Replace per-ag array with a radix tree	2010-01-15 15:33:52 -06:00
xfs_fsops.h
xfs_ialloc_btree.c
xfs_ialloc_btree.h
xfs_ialloc.c	xfs: Replace per-ag array with a radix tree	2010-01-15 15:33:52 -06:00
xfs_ialloc.h	xfs: rationalize xfs_inobt_lookup*	2009-09-01 12:45:39 -05:00
xfs_iget.c	xfs: rename xfs_get_perag	2010-01-15 15:33:02 -06:00
xfs_inode_item.c	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_inode_item.h	xfs: kill xfs_bmbt_rec_32/64 types	2009-12-16 13:41:20 -06:00
xfs_inode.c	xfs: convert remaining direct references to m_perag	2010-01-15 15:33:39 -06:00
xfs_inode.h	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_inum.h	xfs: remove XFS_INO64_OFFSET	2009-08-31 14:46:22 -05:00
xfs_iomap.c	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_iomap.h	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_itable.c	xfs: Replace per-ag array with a radix tree	2010-01-15 15:33:52 -06:00
xfs_itable.h	xfs: add more statics & drop some unused functions	2009-08-31 14:46:20 -05:00
xfs_log_priv.h	xfs: make several more functions static	2010-01-15 15:31:38 -06:00
xfs_log_recover.c	xfs: Use list_heads for log recovery item lists	2010-01-15 15:31:51 -06:00
xfs_log_recover.h	xfs: Use list_heads for log recovery item lists	2010-01-15 15:31:51 -06:00
xfs_log.c	xfs: improve metadata I/O merging in the elevator	2009-12-16 13:41:19 -06:00
xfs_log.h
xfs_mount.c	xfs: Replace per-ag array with a radix tree	2010-01-15 15:33:52 -06:00
xfs_mount.h	xfs: Replace per-ag array with a radix tree	2010-01-15 15:33:52 -06:00
xfs_mru_cache.c	xfs: add more statics & drop some unused functions	2009-08-31 14:46:20 -05:00
xfs_mru_cache.h	xfs: add more statics & drop some unused functions	2009-08-31 14:46:20 -05:00
xfs_quota.h	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_refcache.h
xfs_rename.c	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_rtalloc.c	xfs: fix missing error check in xfs_rtfree_range	2010-01-15 13:46:19 -06:00
xfs_rtalloc.h
xfs_rw.c	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_rw.h	xfs: uninline xfs_get_extsz_hint	2009-12-11 15:11:22 -06:00
xfs_sb.h
xfs_trans_ail.c	xfs: Don't wake the aild once per second	2010-01-15 15:32:46 -06:00
xfs_trans_buf.c	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_trans_extfree.c
xfs_trans_inode.c	xfs: simplify xfs_trans_iget	2009-09-01 12:46:16 -05:00
xfs_trans_item.c
xfs_trans_priv.h
xfs_trans_space.h
xfs_trans.c	xfs: I/O completion handlers must use NOFS allocations	2009-12-11 15:11:20 -06:00
xfs_trans.h	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_types.h
xfs_utils.c	xfs: kill xfs_qmops	2009-06-08 15:33:32 +02:00
xfs_utils.h
xfs_vnodeops.c	xfs: fix timestamp handling in xfs_setattr	2010-01-10 12:21:58 -06:00
xfs_vnodeops.h	xfs: simplify inode teardown	2009-12-11 15:11:19 -06:00
xfs.h	xfs: event tracing support	2009-12-14 23:08:16 -06:00