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Liu Bo 2f697dc6a6 Btrfs: extend the checksum item as much as possible 
For write, we also reserve some space for COW blocks during updating
the checksum tree, and we calculate the number of blocks by checking
if the number of bytes outstanding that are going to need csums needs
one more block for csum.

When we add these checksum into the checksum tree, we use ordered sums
list.
Every ordered sum contains csums for each sector, and we'll first try
to look up an existing csum item,
a) if we don't yet have a proper csum item, then we need to insert one,
b) or if we find one but the csum item is not big enough, then we need
to extend it.

The point is we'll unlock the whole path and then insert or extend.
So others can hack in and update the tree.

Each insert or extend needs update the tree with COW on, and we may need
to insert/extend for many times.

That means what we've reserved for updating checksum tree is NOT enough
indeed.

The case is even more serious with having several write threads at the
same time, it can end up eating our reserved space quickly and starting
eating globle reserve pool instead.

I don't yet come up with a way to calculate the worse case for updating
csum, but extending the checksum item as much as possible can be helpful
in my test.

The idea behind is that it can reduce the times we insert/extend so that
it saves us precious reserved space.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
 		2013-02-20 12:59:37 -05:00
..
Kconfig Btrfs: add config option to enable btrfs integrity check 2011-12-21 19:14:16 +01:00
Makefile Btrfs: add new sources for device replace code 2012-12-12 17:15:41 -05:00
acl.c Btrfs: skip adding an acl attribute if we don't have to 2012-12-16 20:46:15 -05:00
async-thread.c Btrfs: call the ordered free operation without any locks held 2012-07-25 16:15:07 -04:00
async-thread.h btrfs: return void in functions without error conditions 2012-03-22 01:45:34 +01:00
backref.c Btrfs: merge inode_list in __merge_refs 2012-12-12 17:15:27 -05:00
backref.h Btrfs: move fs/btrfs/ioctl.h to include/uapi/linux/btrfs.h 2013-02-20 09:37:28 -05:00
btrfs_inode.h Btrfs: use the inode own lock to protect its delalloc_bytes 2013-02-20 12:59:06 -05:00
check-integrity.c Btrfs: fix race in check-integrity caused by usage of bitfield 2012-12-16 20:46:13 -05:00
check-integrity.h Btrfs: add optional integrity check code 2011-12-21 19:14:09 +01:00
compat.h
…
compression.c Btrfs: handle errors from btrfs_map_bio() everywhere 2012-12-12 17:15:40 -05:00
compression.h btrfs: return void in functions without error conditions 2012-03-22 01:45:34 +01:00
ctree.c btrfs: remove cache only arguments from defrag path 2013-02-20 12:59:36 -05:00
ctree.h btrfs: remove cache only arguments from defrag path 2013-02-20 12:59:36 -05:00
delayed-inode.c btrfs: remove unused "item" in btrfs_insert_delayed_item() 2013-02-20 12:59:23 -05:00
delayed-inode.h Btrfs: fix lots of orphan inodes when the space is not enough 2013-02-20 09:36:39 -05:00
delayed-ref.c Btrfs: make delayed ref lock logic more readable 2013-02-20 09:36:41 -05:00
delayed-ref.h Btrfs: make delayed ref lock logic more readable 2013-02-20 09:36:41 -05:00
dev-replace.c Btrfs: check the return value of btrfs_start_delalloc_inodes() 2013-02-20 09:37:21 -05:00
dev-replace.h Btrfs: add new sources for device replace code 2012-12-12 17:15:41 -05:00
dir-item.c Btrfs: fix hash overflow handling 2012-12-17 14:48:21 -05:00
disk-io.c Btrfs: fix how we discard outstanding ordered extents on abort 2013-02-20 12:59:28 -05:00
disk-io.h Btrfs: cleanup for btrfs_btree_balance_dirty 2012-12-12 17:15:28 -05:00
export.c ->encode_fh() API change 2012-05-29 23:28:33 -04:00
export.h
…
extent-tree.c Btrfs: rework the overcommit logic to be based on the total size 2013-02-20 12:59:32 -05:00
extent_io.c Btrfs: use percpu counter for dirty metadata count 2013-02-20 12:59:04 -05:00
extent_io.h Btrfs: pass fs_info to btrfs_map_block() instead of mapping_tree 2012-12-12 17:15:34 -05:00
extent_map.c Btrfs: do not merge logged extents if we've removed them from the tree 2013-02-05 16:09:03 -05:00
extent_map.h Btrfs: do not allow logged extents to be merged or removed 2013-01-24 12:49:48 -05:00
file-item.c Btrfs: extend the checksum item as much as possible 2013-02-20 12:59:37 -05:00
file.c Btrfs: use bit operation for ->fs_state 2013-02-20 12:59:09 -05:00
free-space-cache.c Btrfs: fix panic when recovering tree log 2013-01-24 12:49:49 -05:00
free-space-cache.h btrfs: remove all unused functions 2011-05-06 12:34:03 +02:00
hash.h btrfs: extended inode refs 2012-10-09 09:14:45 -04:00
inode-item.c btrfs: extended inode refs 2012-10-09 09:14:45 -04:00
inode-map.c Btrfs: improve the noflush reservation 2012-12-11 13:31:31 -05:00
inode-map.h Btrfs: Support reading/writing on disk free ino cache 2011-04-25 16:46:11 +08:00
inode.c Btrfs: handle errors in compression submission path 2013-02-20 12:59:33 -05:00
ioctl.c btrfs: remove cache only arguments from defrag path 2013-02-20 12:59:36 -05:00
locking.c Btrfs: save us a read_lock 2013-02-20 09:37:17 -05:00
locking.h btrfs: return void in functions without error conditions 2012-03-22 01:45:34 +01:00
lzo.c btrfs: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:21 +08:00
math.h Btrfs: cleanup duplicated division functions 2012-12-11 13:31:30 -05:00
ordered-data.c Btrfs: don't traverse the ordered operation list repeatedly 2013-02-20 09:37:24 -05:00
ordered-data.h Btrfs: wait on ordered extents at the last possible moment 2013-02-20 09:37:04 -05:00
orphan.c btrfs: replace many BUG_ONs with proper error handling 2012-03-22 11:52:54 +01:00
print-tree.c btrfs: add missing break in btrfs_print_leaf() 2013-02-20 12:59:20 -05:00
print-tree.h
…
qgroup.c Btrfs: move fs/btrfs/ioctl.h to include/uapi/linux/btrfs.h 2013-02-20 09:37:28 -05:00
rcu-string.h Btrfs: use rcu to protect device->name 2012-06-14 21:29:16 -04:00
reada.c Btrfs: introduce GET_READ_MIRRORS functionality for btrfs_map_block() 2012-12-12 17:15:43 -05:00
relocation.c Btrfs: use wrapper page_offset 2013-02-20 09:36:43 -05:00
root-tree.c Btrfs: rename root_times_lock to root_item_lock 2012-12-16 20:46:21 -05:00
scrub.c Btrfs: use bit operation for ->fs_state 2013-02-20 12:59:09 -05:00
send.c btrfs: remove unused fd in btrfs_ioctl_send() 2013-02-20 12:59:14 -05:00
send.h Btrfs: write_buf is now callable outside send.c 2012-10-04 09:39:55 -04:00
struct-funcs.c Btrfs: rewrite BTRFS_SETGET_FUNCS 2012-07-23 16:28:06 -04:00
super.c btrfs: fix varargs in __btrfs_std_error 2013-02-20 12:59:22 -05:00
sysfs.c btrfs: Remove unused sysfs code 2011-06-17 14:54:18 -04:00
transaction.c btrfs: remove cache only arguments from defrag path 2013-02-20 12:59:36 -05:00
transaction.h btrfs: remove cache only arguments from defrag path 2013-02-20 12:59:36 -05:00
tree-defrag.c btrfs: remove cache only arguments from defrag path 2013-02-20 12:59:36 -05:00
tree-log.c btrfs: remove cache only arguments from defrag path 2013-02-20 12:59:36 -05:00
tree-log.h btrfs: return void in functions without error conditions 2012-03-22 01:45:34 +01:00
ulist.c Btrfs: make aux field of ulist 64 bit 2012-10-01 15:18:53 -04:00
ulist.h Btrfs: make aux field of ulist 64 bit 2012-10-01 15:18:53 -04:00
version.h
…
volumes.c btrfs: ensure we don't overrun devices_info[] in __btrfs_alloc_chunk 2013-02-20 12:59:26 -05:00
volumes.h Btrfs: move fs/btrfs/ioctl.h to include/uapi/linux/btrfs.h 2013-02-20 09:37:28 -05:00
xattr.c Btrfs: only log the inode item if we can get away with it 2012-12-16 20:46:21 -05:00
xattr.h fs/vfs/security: pass last path component to LSM on inode creation 2011-02-01 11:12:29 -05:00
zlib.c btrfs: fix message printing 2012-10-09 09:19:57 -04:00