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a5ed918285
linux/fs/btrfs
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Omar Sandoval a5ed918285 Btrfs: implement the free space B-tree 
The free space cache has turned out to be a scalability bottleneck on
large, busy filesystems. When the cache for a lot of block groups needs
to be written out, we can get extremely long commit times; if this
happens in the critical section, things are especially bad because we
block new transactions from happening.

The main problem with the free space cache is that it has to be written
out in its entirety and is managed in an ad hoc fashion. Using a B-tree
to store free space fixes this: updates can be done as needed and we get
all of the benefits of using a B-tree: checksumming, RAID handling,
well-understood behavior.

With the free space tree, we get commit times that are about the same as
the no cache case with load times slower than the free space cache case
but still much faster than the no cache case. Free space is represented
with extents until it becomes more space-efficient to use bitmaps,
giving us similar space overhead to the free space cache.

The operations on the free space tree are: adding and removing free
space, handling the creation and deletion of block groups, and loading
the free space for a block group. We can also create the free space tree
by walking the extent tree and clear the free space tree.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
2015-12-17 12:16:47 -08:00
..
tests Btrfs: add extent buffer bitmap sanity tests 2015-12-17 12:16:46 -08:00
acl.c
async-thread.c btrfs: async_thread: Fix workqueue 'max_active' value when initializing 2015-08-31 11:46:40 -07:00
async-thread.h btrfs: async_thread: Fix workqueue 'max_active' value when initializing 2015-08-31 11:46:40 -07:00
backref.c btrfs: fix use after free iterating extrefs 2015-10-13 18:54:44 -07:00
backref.h
btrfs_inode.h Btrfs: Direct I/O: Fix space accounting 2015-09-21 13:47:55 -07:00
check-integrity.c block: add a bi_error field to struct bio 2015-07-29 08:55:15 -06:00
check-integrity.h
compression.c block: remove bio_get_nr_vecs() 2015-08-13 12:32:04 -06:00
compression.h
ctree.c btrfs: abort transaction on btrfs_reloc_cow_block() 2015-08-09 07:07:14 -07:00
ctree.h Btrfs: implement the free space B-tree 2015-12-17 12:16:47 -08:00
delayed-inode.c Btrfs: fill ->last_trans for delayed inode in btrfs_fill_inode. 2015-04-26 06:27:03 -07:00
delayed-inode.h
delayed-ref.c btrfs: delayed-ref: double free in btrfs_add_delayed_tree_ref() 2015-06-24 12:28:03 -07:00
delayed-ref.h btrfs: qgroup: Add the ability to skip given qgroup for old/new_roots. 2015-06-10 09:26:23 -07:00
dev-replace.c Btrfs: cleanup: remove unnecessary check before btrfs_free_path is called 2015-08-31 11:46:41 -07:00
dev-replace.h
dir-item.c
disk-io.c Merge branch 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs 2015-10-09 16:39:35 -07:00
disk-io.h btrfs: Add raid56 support for updating 2015-08-31 11:45:48 -07:00
export.c BTRFS: support NFSv2 export 2015-10-06 06:55:23 -07:00
export.h
extent_io.c Btrfs: add extent buffer bitmap sanity tests 2015-12-17 12:16:46 -08:00
extent_io.h Btrfs: add extent buffer bitmap sanity tests 2015-12-17 12:16:46 -08:00
extent_map.c
extent_map.h
extent-tree.c Btrfs: implement the free space B-tree 2015-12-17 12:16:47 -08:00
extent-tree.h btrfs: qgroup: Add new qgroup calculation function 2015-06-10 09:25:49 -07:00
file-item.c
file.c btrfs: Avoid truncate tailing page if fallocate range doesn't exceed inode size 2015-10-20 19:07:29 -07:00
free-space-cache.c btrfs: add missing discards when unpinning extents with -o discard 2015-07-29 08:15:29 -07:00
free-space-cache.h
free-space-tree.c Btrfs: implement the free space B-tree 2015-12-17 12:16:47 -08:00
free-space-tree.h Btrfs: implement the free space B-tree 2015-12-17 12:16:47 -08:00
hash.c
hash.h
inode-item.c
inode-map.c Btrfs: fix race between caching kthread and returning inode to inode cache 2015-06-30 14:36:46 -07:00
inode-map.h
inode.c Merge branch 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs 2015-09-25 12:08:41 -07:00
ioctl.c btrfs: fix possible leak in btrfs_ioctl_balance() 2015-10-21 18:10:02 -07:00
Kconfig
locking.c btrfs: Add WARN_ON() for double lock in btrfs_tree_lock() 2015-08-09 07:07:14 -07:00
locking.h
lzo.c
Makefile Btrfs: implement the free space B-tree 2015-12-17 12:16:47 -08:00
math.h
ordered-data.c Btrfs: fix memory corruption on failure to submit bio for direct IO 2015-07-01 17:17:18 -07:00
ordered-data.h Btrfs: avoid syncing log in the fast fsync path when not necessary 2015-06-10 07:02:43 -07:00
orphan.c
print-tree.c
print-tree.h
props.c
props.h
qgroup.c Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2015-09-01 18:46:42 -07:00
qgroup.h btrfs: qgroup: Cleanup the old ref_node-oriented mechanism. 2015-06-10 09:26:11 -07:00
raid56.c Merge branch 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs 2015-09-05 15:14:43 -07:00
raid56.h Btrfs: add RAID 5/6 BTRFS_RBIO_REBUILD_MISSING operation 2015-08-09 07:34:26 -07:00
rcu-string.h
reada.c Btrfs: count devices correctly in readahead during RAID 5/6 replace 2015-08-09 07:34:26 -07:00
relocation.c btrfs: Remove unnecessary variants in relocation.c 2015-08-09 07:07:14 -07:00
root-tree.c
scrub.c Merge branch 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs 2015-09-11 12:38:25 -07:00
send.c Btrfs: send, fix corner case for reference overwrite detection 2015-10-05 16:56:27 -07:00
send.h
struct-funcs.c
super.c Merge branch 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs 2015-09-25 12:08:41 -07:00
sysfs.c Btrfs: Check if kobject is initialized before put 2015-06-22 14:43:31 +02:00
sysfs.h Btrfs: sysfs: btrfs_sysfs_remove_fsid() make it non static 2015-05-27 12:27:22 +02:00
transaction.c Merge branch 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs 2015-10-09 16:39:35 -07:00
transaction.h Btrfs: fix deadlock when finalizing block group creation 2015-10-05 16:56:38 -07:00
tree-defrag.c Btrfs: cleanup: remove unnecessary check before btrfs_free_path is called 2015-08-31 11:46:41 -07:00
tree-log.c Btrfs: fix file read corruption after extent cloning and fsync 2015-08-19 14:27:46 -07:00
tree-log.h
ulist.c btrfs: ulist: Add ulist_del() function. 2015-06-10 09:26:17 -07:00
ulist.h btrfs: ulist: Add ulist_del() function. 2015-06-10 09:26:17 -07:00
uuid-tree.c
volumes.c Merge branch 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs 2015-09-11 12:38:25 -07:00
volumes.h btrfs: check unsupported filters in balance arguments 2015-10-13 18:53:03 -07:00
xattr.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-26 17:22:07 -07:00
xattr.h
zlib.c