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linux-stable/fs/btrfs
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Li Zefan 7fe1e64150 Btrfs: rewrite btrfs_trim_block_group() 
There are various bugs in block group trimming:

- It may trim from offset smaller than user-specified offset.
- It may trim beyond user-specified range.
- It may leak free space for extents smaller than specified minlen.
- It may truncate the last trimmed extent thus leak free space.
- With mixed extents+bitmaps, some extents may not be trimmed.
- With mixed extents+bitmaps, some bitmaps may not be trimmed (even
none will be trimmed). Even for those trimmed, not all the free space
in the bitmaps will be trimmed.

I rewrite btrfs_trim_block_group() and break it into two functions.
One is to trim extents only, and the other is to trim bitmaps only.

Before patching:

	# fstrim -v /mnt/
	/mnt/: 1496465408 bytes were trimmed

After patching:

	# fstrim -v /mnt/
	/mnt/: 2193768448 bytes were trimmed

And this matches the total free space:

	# btrfs fi df /mnt
	Data: total=3.58GB, used=1.79GB
	System, DUP: total=8.00MB, used=4.00KB
	System: total=4.00MB, used=0.00
	Metadata, DUP: total=205.12MB, used=97.14MB
	Metadata: total=8.00MB, used=0.00

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2012-01-11 10:26:48 +08:00
..
acl.c Btrfs: fix return value of btrfs_get_acl() 2011-10-20 18:10:47 +02:00
async-thread.c Btrfs: fix worker lock misuse in find_worker 2011-12-23 07:53:00 -05:00
async-thread.h Btrfs: fix num_workers_starting bug and other bugs in async thread 2011-12-15 11:04:21 -05:00
backref.c btrfs: Fix up 32/64-bit compatibility for new ioctls 2011-11-20 07:42:13 -05:00
backref.h btrfs: added helper functions to iterate backrefs 2011-09-29 12:54:27 +02:00
btrfs_inode.h Btrfs: fix our reservations for updating an inode when completing io 2011-11-08 15:47:34 -05:00
compat.h Btrfs: drop remaining LINUX_KERNEL_VERSION checks and compat code 2009-01-06 09:38:55 -05:00
compression.c btrfs: separate superblock items out of fs_info 2011-11-06 03:04:01 -05:00
compression.h btrfs: rename variables clashing with global function names 2011-05-02 13:57:19 +02:00
ctree.c Btrfs: fix tree corruption after multi-thread snapshots and inode_cache flush 2011-11-15 09:53:28 -05:00
ctree.h Btrfs: deal with enospc from dirtying inodes properly 2011-12-15 11:04:21 -05:00
delayed-inode.c Btrfs: deal with NULL srv_rsv in the delalloc inode reservation code 2011-12-15 13:36:29 -05:00
delayed-inode.h atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
delayed-ref.c btrfs: remove old unused commented out code 2011-05-06 12:34:10 +02:00
delayed-ref.h btrfs: remove all unused functions 2011-05-06 12:34:03 +02:00
dir-item.c Btrfs: remove redundant code for dir item lookup 2011-08-01 14:30:48 -04:00
disk-io.c Btrfs: fix num_workers_starting bug and other bugs in async thread 2011-12-15 11:04:21 -05:00
disk-io.h Merge branch 'for-chris' of git://github.com/sensille/linux into integration 2011-11-06 03:05:08 -05:00
export.c Merge branch 'ino-alloc' of git://repo.or.cz/linux-btrfs-devel into inode_numbers 2011-05-21 09:27:38 -04:00
export.h
extent-tree.c Btrfs: don't pass a trans handle unnecessarily in volumes.c 2012-01-11 10:26:42 +08:00
extent_io.c Btrfs: drop spin lock when memory alloc fails 2011-12-08 08:55:47 -05:00
extent_io.h btrfs: mirror_num should be int, not u64 2011-11-20 07:42:14 -05:00
extent_map.c Btrfs: clean up code for merging extent maps 2011-08-01 14:30:50 -04:00
extent_map.h btrfs: drop gfp parameter from alloc_extent_map 2011-05-02 13:57:21 +02:00
file-item.c btrfs: separate superblock items out of fs_info 2011-11-06 03:04:01 -05:00
file.c Btrfs: deal with enospc from dirtying inodes properly 2011-12-15 11:04:21 -05:00
free-space-cache.c Btrfs: rewrite btrfs_trim_block_group() 2012-01-11 10:26:48 +08:00
free-space-cache.h btrfs: remove all unused functions 2011-05-06 12:34:03 +02:00
hash.h Btrfs: remove crc32c.h and use libcrc32c directly. 2009-06-10 11:29:53 -04:00
inode-item.c Btrfs: BUG_ON is deleted from the caller of btrfs_truncate_item & btrfs_extend_item 2011-05-23 13:24:39 -04:00
inode-map.c Btrfs: fix no reserved space for writing out inode cache 2011-11-10 20:45:04 -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: call d_instantiate after all ops are setup 2011-12-23 08:02:26 -05:00
ioctl.c Btrfs: reserve metadata space in btrfs_ioctl_setflags() 2012-01-11 10:26:39 +08:00
ioctl.h Btrfs: fix the new inspection ioctls for 32 bit compat 2011-11-06 03:08:49 -05:00
Kconfig btrfs: Add lzo compression support 2010-12-22 23:15:47 +08:00
locking.c Btrfs: switch the btrfs tree locks to reader/writer 2011-07-27 12:46:46 -04:00
locking.h Btrfs: switch the btrfs tree locks to reader/writer 2011-07-27 12:46:46 -04:00
lzo.c Btrfs: Avoid accessing unmapped kernel address 2011-02-16 15:37:58 -05:00
Makefile Merge git://git.jan-o-sch.net/btrfs-unstable into integration 2011-11-06 03:07:10 -05:00
ordered-data.c Btrfs: add initial tracepoint support for btrfs 2011-03-28 05:37:33 -04:00
ordered-data.h btrfs: Allow to add new compression algorithm 2010-12-22 23:15:45 +08:00
orphan.c Btrfs: fixup return code for btrfs_del_orphan_item 2010-12-09 13:57:15 -05:00
print-tree.c btrfs: fix oops on failure path 2011-10-20 18:10:50 +02:00
print-tree.h
reada.c Btrfs: rename btrfs_bio multi -> bbio for consistency 2011-11-06 03:11:21 -05:00
relocation.c Btrfs: fix how we do delalloc reservations and how we free reservations on error 2011-12-15 11:04:22 -05:00
root-tree.c btrfs: make btrfs_set_root_node void 2011-08-01 14:30:44 -04:00
scrub.c Btrfs: fix num_workers_starting bug and other bugs in async thread 2011-12-15 11:04:21 -05:00
struct-funcs.c Btrfs: stop using highmem for extent_buffers 2011-07-27 12:46:45 -04:00
super.c Merge branch 'for-chris' of http://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-work into integration 2011-12-15 13:43:49 -05:00
sysfs.c btrfs: Remove unused sysfs code 2011-06-17 14:54:18 -04:00
transaction.c Btrfs: fix tree corruption after multi-thread snapshots and inode_cache flush 2011-11-15 09:53:28 -05:00
transaction.h Merge branch 'for-chris' of 2011-05-28 07:00:39 -04:00
tree-defrag.c btrfs: drop unused parameter from btrfs_release_path 2011-05-02 13:57:22 +02:00
tree-log.c btrfs: separate superblock items out of fs_info 2011-11-06 03:04:01 -05:00
tree-log.h btrfs: remove unused function prototypes 2011-05-04 14:01:26 +02:00
version.h
volumes.c Btrfs: simplfy calculation of stripe length for discard operation 2012-01-11 10:26:46 +08:00
volumes.h Btrfs: don't pass a trans handle unnecessarily in volumes.c 2012-01-11 10:26:42 +08:00
xattr.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs into for-linus 2012-01-11 09:54:49 +08:00
xattr.h fs/vfs/security: pass last path component to LSM on inode creation 2011-02-01 11:12:29 -05:00
zlib.c zlib: slim down zlib_deflate() workspace when possible 2011-03-22 17:44:17 -07:00