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remarkable-linux/fs/btrfs
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Jan Schmidt fc36ed7e0b Btrfs: separate sequence numbers for delayed ref tracking and tree mod log 
Sequence numbers for delayed refs have been introduced in the first version
of the qgroup patch set. To solve the problem of find_all_roots on a busy
file system, the tree mod log was introduced. The sequence numbers for that
were simply shared between those two users.

However, at one point in qgroup's quota accounting, there's a statement
accessing the previous sequence number, that's still just doing (seq - 1)
just as it would have to in the very first version.

To satisfy that requirement, this patch makes the sequence number counter 64
bit and splits it into a major part (used for qgroup sequence number
counting) and a minor part (incremented for each tree modification in the
log). This enables us to go exactly one major step backwards, as required
for qgroups, while still incrementing the sequence counter for tree mod log
insertions to keep track of their order. Keeping them in a single variable
means there's no need to change all the code dealing with comparisons of two
sequence numbers.

The sequence number is reset to 0 on commit (not new in this patch), which
ensures we won't overflow the two 32 bit counters.

Without this fix, the qgroup tracking can occasionally go wrong and WARN_ONs
from the tree mod log code may happen.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2013-05-06 15:55:17 -04:00
..
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: fix all callers of read_tree_block 2013-05-06 15:55:07 -04:00
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: fix minor typo in comment 2013-05-06 15:54:49 -04:00
check-integrity.c btrfs: define BTRFS_MAGIC as a u64 value 2013-02-20 13:00:01 -05:00
check-integrity.h Btrfs: add optional integrity check code 2011-12-21 19:14:09 +01:00
compat.h Btrfs: drop remaining LINUX_KERNEL_VERSION checks and compat code 2009-01-06 09:38:55 -05:00
compression.c Btrfs: cleanup unused arguments of btrfs_csum_data 2013-05-06 15:54:14 -04:00
compression.h btrfs: return void in functions without error conditions 2012-03-22 01:45:34 +01:00
ctree.c Btrfs: separate sequence numbers for delayed ref tracking and tree mod log 2013-05-06 15:55:17 -04:00
ctree.h Btrfs: separate sequence numbers for delayed ref tracking and tree mod log 2013-05-06 15:55:17 -04:00
delayed-inode.c Btrfs: cleanup of function where fixup_low_keys() is called 2013-05-06 15:54:52 -04:00
delayed-inode.h Btrfs: improve the delayed inode throttling 2013-03-07 07:52:40 -05:00
delayed-ref.c Btrfs: separate sequence numbers for delayed ref tracking and tree mod log 2013-05-06 15:55:17 -04:00
delayed-ref.h Merge branch 'raid56-experimental' into for-linus-3.9 2013-02-20 14:06:05 -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: remove unused argument of btrfs_extend_item() 2013-05-06 15:54:53 -04:00
disk-io.c Btrfs: separate sequence numbers for delayed ref tracking and tree mod log 2013-05-06 15:55:17 -04:00
disk-io.h Btrfs: cleanup unused arguments of btrfs_csum_data 2013-05-06 15:54:14 -04:00
export.c fs: encode_fh: return FILEID_INVALID if invalid fid_type 2013-02-26 02:46:10 -05:00
export.h NFS support for btrfs - v3 2008-09-25 11:04:06 -04:00
extent-tree.c Btrfs: separate sequence numbers for delayed ref tracking and tree mod log 2013-05-06 15:55:17 -04:00
extent_io.c btrfs: move leak debug code to functions 2013-05-06 15:55:16 -04:00
extent_io.h btrfs: move leak debug code to functions 2013-05-06 15:55:16 -04:00
extent_map.c Btrfs: fix bad extent logging 2013-05-06 15:54:34 -04:00
extent_map.h Btrfs: fix bad extent logging 2013-05-06 15:54:34 -04:00
file-item.c Btrfs: remove unused argument of btrfs_extend_item() 2013-05-06 15:54:53 -04:00
file.c Btrfs: cleanup of function where fixup_low_keys() is called 2013-05-06 15:54:52 -04:00
free-space-cache.c Btrfs: Include the device in most error printk()s 2013-05-06 15:54:23 -04:00
free-space-cache.h Btrfs: add some free space cache tests 2013-05-06 15:52:54 -04:00
hash.h btrfs: extended inode refs 2012-10-09 09:14:45 -04:00
inode-item.c Btrfs: remove unused argument of btrfs_extend_item() 2013-05-06 15:54:53 -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: return free space in cow error path 2013-05-06 15:55:15 -04:00
ioctl.c Btrfs: return error when we specify wrong start to defrag 2013-05-06 15:54:55 -04:00
Kconfig btrfs: move leak debug code to functions 2013-05-06 15:55:16 -04:00
locking.c Btrfs: save us a read_lock 2013-02-20 09:37:17 -05:00
locking.h Btrfs: remove btrfs_try_spin_lock 2013-03-14 14:57:10 -04:00
lzo.c btrfs: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:21 +08:00
Makefile Btrfs: RAID5 and RAID6 2013-02-01 14:24:23 -05:00
math.h Btrfs: cleanup duplicated division functions 2012-12-11 13:31:30 -05:00
ordered-data.c Btrfs: improve the performance of the csums lookup 2013-05-06 15:54:35 -04:00
ordered-data.h Btrfs: improve the performance of the csums lookup 2013-05-06 15:54:35 -04:00
orphan.c btrfs: replace many BUG_ONs with proper error handling 2012-03-22 11:52:54 +01:00
print-tree.c Btrfs: Include the device in most error printk()s 2013-05-06 15:54:23 -04:00
print-tree.h
qgroup.c Btrfs: separate sequence numbers for delayed ref tracking and tree mod log 2013-05-06 15:55:17 -04:00
raid56.c btrfs/raid56: Add missing #include <linux/vmalloc.h> 2013-03-03 06:53:41 -05:00
raid56.h Btrfs: RAID5 and RAID6 2013-02-01 14:24:23 -05:00
rcu-string.h Btrfs: use rcu to protect device->name 2012-06-14 21:29:16 -04:00
reada.c Btrfs: fix reada debug code compilation 2013-05-06 15:54:55 -04:00
relocation.c Btrfs: fix all callers of read_tree_block 2013-05-06 15:55:07 -04:00
root-tree.c Btrfs: delete unused parameter to btrfs_read_root_item() 2013-05-06 15:55:14 -04:00
scrub.c Btrfs: add a incompatible format change for smaller metadata extent refs 2013-05-06 15:54:18 -04:00
send.c Btrfs: fix error handling in btrfs_ioctl_send() 2013-05-06 15:55:13 -04:00
send.h btrfs: add "no file data" flag to btrfs send ioctl 2013-02-20 12:59:39 -05:00
struct-funcs.c Btrfs: rewrite BTRFS_SETGET_FUNCS 2012-07-23 16:28:06 -04:00
super.c Btrfs: fix lockdep warning 2013-05-06 15:55:00 -04:00
sysfs.c btrfs: fixup/remove module.h usage as required 2013-03-01 15:01:01 -05:00
transaction.c Btrfs: separate sequence numbers for delayed ref tracking and tree mod log 2013-05-06 15:55:17 -04:00
transaction.h btrfs: clean snapshots one by one 2013-05-06 15:54:21 -04:00
tree-defrag.c btrfs: remove cache only arguments from defrag path 2013-02-20 12:59:36 -05:00
tree-log.c Btrfs: check return value of commit when recovering log 2013-05-06 15:55:10 -04:00
tree-log.h btrfs: return void in functions without error conditions 2012-03-22 01:45:34 +01:00
ulist.c Btrfs: add a rb_tree to improve performance of ulist search 2013-05-06 15:54:44 -04:00
ulist.h Btrfs: add a rb_tree to improve performance of ulist search 2013-05-06 15:54:44 -04:00
version.h Update Btrfs files for in-kernel usage 2008-09-25 15:41:59 -04:00
volumes.c Btrfs: don't BUG_ON() in btrfs_num_copies 2013-05-06 15:55:04 -04:00
volumes.h Merge branch 'raid56-experimental' into for-linus-3.9 2013-02-20 14:06:05 -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