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	NFS support for btrfs - v3	2008-09-25 11:04:06 -04:00
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
extent-tree.c	Btrfs: don't pass a trans handle unnecessarily in volumes.c	2012-01-11 10:26:42 +08:00
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	Btrfs: Create extent_buffer interface for large blocksizes	2008-09-25 11:03:56 -04:00
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	Update Btrfs files for in-kernel usage	2008-09-25 15:41:59 -04:00
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