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* btrfs: disable strict file flushes for renames and truncatesChris Mason2014-08-151-31/+2
| | | | | | | | | | | | | | | | | | | | | | Truncates and renames are often used to replace old versions of a file with new versions. Applications often expect this to be an atomic replacement, even if they haven't done anything to make sure the new version is fully on disk. Btrfs has strict flushing in place to make sure that renaming over an old file with a new file will fully flush out the new file before allowing the transaction commit with the rename to complete. This ordering means the commit code needs to be able to lock file pages, and there are a few paths in the filesystem where we will try to end a transaction with the page lock held. It's rare, but these things can deadlock. This patch removes the ordered flushes and switches to a best effort filemap_flush like ext4 uses. It's not perfect, but it should fix the deadlocks. Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: fix crash when starting transactionFilipe Manana2014-07-031-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Often when starting a transaction we commit the currently running transaction, which can end up writing block group caches when the current process has its journal_info set to NULL (and not to a transaction). This makes our assertion at btrfs_check_data_free_space() (current_journal != NULL) fail, resulting in a crash/hang. Therefore fix it by setting journal_info. Two different traces of this issue follow below. 1) [51502.241936] BTRFS: assertion failed: current->journal_info, file: fs/btrfs/extent-tree.c, line: 3670 [51502.242213] ------------[ cut here ]------------ [51502.242493] kernel BUG at fs/btrfs/ctree.h:3964! [51502.242669] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC (...) [51502.244010] Call Trace: [51502.244010] [<ffffffffa02bc025>] btrfs_check_data_free_space+0x395/0x3a0 [btrfs] [51502.244010] [<ffffffffa02c3bdc>] btrfs_write_dirty_block_groups+0x4ac/0x640 [btrfs] [51502.244010] [<ffffffffa0357a6a>] commit_cowonly_roots+0x164/0x226 [btrfs] [51502.244010] [<ffffffffa02d53cd>] btrfs_commit_transaction+0x4ed/0xab0 [btrfs] [51502.244010] [<ffffffff8168ec7b>] ? _raw_spin_unlock+0x2b/0x40 [51502.244010] [<ffffffffa02d6259>] start_transaction+0x459/0x620 [btrfs] [51502.244010] [<ffffffffa02d67ab>] btrfs_start_transaction+0x1b/0x20 [btrfs] [51502.244010] [<ffffffffa02d73e1>] __unlink_start_trans+0x31/0xe0 [btrfs] [51502.244010] [<ffffffffa02dea67>] btrfs_unlink+0x37/0xc0 [btrfs] [51502.244010] [<ffffffff811bb054>] ? do_unlinkat+0x114/0x2a0 [51502.244010] [<ffffffff811baebc>] vfs_unlink+0xcc/0x150 [51502.244010] [<ffffffff811bb1a0>] do_unlinkat+0x260/0x2a0 [51502.244010] [<ffffffff811a9ef4>] ? filp_close+0x64/0x90 [51502.244010] [<ffffffff810aaea6>] ? trace_hardirqs_on_caller+0x16/0x1e0 [51502.244010] [<ffffffff81349cab>] ? trace_hardirqs_on_thunk+0x3a/0x3f [51502.244010] [<ffffffff811be9eb>] SyS_unlinkat+0x1b/0x40 [51502.244010] [<ffffffff81698452>] system_call_fastpath+0x16/0x1b [51502.244010] Code: 0b 55 48 89 e5 0f 0b 55 48 89 e5 0f 0b 55 89 f1 48 c7 c2 71 13 36 a0 48 89 fe 31 c0 48 c7 c7 b8 43 36 a0 48 89 e5 e8 5d b0 32 e1 <0f> 0b 0f 1f 44 00 00 55 b9 11 00 00 00 48 89 e5 41 55 49 89 f5 [51502.244010] RIP [<ffffffffa03575da>] assfail.constprop.88+0x1e/0x20 [btrfs] 2) [25405.097230] BTRFS: assertion failed: current->journal_info, file: fs/btrfs/extent-tree.c, line: 3670 [25405.097488] ------------[ cut here ]------------ [25405.097767] kernel BUG at fs/btrfs/ctree.h:3964! [25405.097940] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC (...) [25405.100008] Call Trace: [25405.100008] [<ffffffffa02bc025>] btrfs_check_data_free_space+0x395/0x3a0 [btrfs] [25405.100008] [<ffffffffa02c3bdc>] btrfs_write_dirty_block_groups+0x4ac/0x640 [btrfs] [25405.100008] [<ffffffffa035755a>] commit_cowonly_roots+0x164/0x226 [btrfs] [25405.100008] [<ffffffffa02d53cd>] btrfs_commit_transaction+0x4ed/0xab0 [btrfs] [25405.100008] [<ffffffff8109c170>] ? bit_waitqueue+0xc0/0xc0 [25405.100008] [<ffffffffa02d6259>] start_transaction+0x459/0x620 [btrfs] [25405.100008] [<ffffffffa02d67ab>] btrfs_start_transaction+0x1b/0x20 [btrfs] [25405.100008] [<ffffffffa02e3407>] btrfs_create+0x47/0x210 [btrfs] [25405.100008] [<ffffffffa02d74cc>] ? btrfs_permission+0x3c/0x80 [btrfs] [25405.100008] [<ffffffff811bc63b>] vfs_create+0x9b/0x130 [25405.100008] [<ffffffff811bcf19>] do_last+0x849/0xe20 [25405.100008] [<ffffffff811b9409>] ? link_path_walk+0x79/0x820 [25405.100008] [<ffffffff811bd5b5>] path_openat+0xc5/0x690 [25405.100008] [<ffffffff810ab07d>] ? trace_hardirqs_on+0xd/0x10 [25405.100008] [<ffffffff811cdcd2>] ? __alloc_fd+0x32/0x1d0 [25405.100008] [<ffffffff811be2a3>] do_filp_open+0x43/0xa0 [25405.100008] [<ffffffff811cddf1>] ? __alloc_fd+0x151/0x1d0 [25405.100008] [<ffffffff811abcfc>] do_sys_open+0x13c/0x230 [25405.100008] [<ffffffff810aaea6>] ? trace_hardirqs_on_caller+0x16/0x1e0 [25405.100008] [<ffffffff811abe12>] SyS_open+0x22/0x30 [25405.100008] [<ffffffff81698452>] system_call_fastpath+0x16/0x1b [25405.100008] Code: 0b 55 48 89 e5 0f 0b 55 48 89 e5 0f 0b 55 89 f1 48 c7 c2 51 13 36 a0 48 89 fe 31 c0 48 c7 c7 d0 43 36 a0 48 89 e5 e8 6d b5 32 e1 <0f> 0b 0f 1f 44 00 00 55 b9 11 00 00 00 48 89 e5 41 55 49 89 f5 [25405.100008] RIP [<ffffffffa03570ca>] assfail.constprop.88+0x1e/0x20 [btrfs] Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com> Signed-off-by: Chris Mason <clm@fb.com>
* btrfs: remove stale comment from btrfs_flush_all_pending_stuffsDavid Sterba2014-07-031-5/+0
| | | | | | | Commit fcebe4562dec83b3f8d3088d77584727b09130b2 (Btrfs: rework qgroup accounting) removed the qgroup accounting after delayed refs. Signed-off-by: David Sterba <dsterba@suse.cz>
* Btrfs: assert send doesn't attempt to start transactionsFilipe Manana2014-06-281-2/+4
| | | | | | | | | | | | | | When starting a transaction just assert that current->journal_info doesn't contain a send transaction stub, since send isn't supposed to start transactions and when it finishes (either successfully or not) it's supposed to set current->journal_info to NULL. This is motivated by the change titled: Btrfs: fix crash when starting transaction Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com> Signed-off-by: Chris Mason <clm@fb.com>
* btrfs: fix error handling in create_pending_snapshotEric Sandeen2014-06-131-5/+7
| | | | | | | | | | fcebe456 cut and pasted some code to a later point in create_pending_snapshot(), but didn't switch to the appropriate error handling for this stage of the function. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: convert smp_mb__{before,after}_clear_bitChris Mason2014-06-101-2/+2
| | | | | | | The new call is smp_mb__{before,after}_atomic. The __ gives us extra protection from the atomic rays. Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: async delayed refsChris Mason2014-06-091-3/+16
| | | | | | | | | | | | Delayed extent operations are triggered during transaction commits. The goal is to queue up a healthly batch of changes to the extent allocation tree and run through them in bulk. This farms them off to async helper threads. The goal is to have the bulk of the delayed operations being done in the background, but this is also important to limit our stack footprint. Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: rework qgroup accountingJosef Bacik2014-06-091-26/+26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently qgroups account for space by intercepting delayed ref updates to fs trees. It does this by adding sequence numbers to delayed ref updates so that it can figure out how the tree looked before the update so we can adjust the counters properly. The problem with this is that it does not allow delayed refs to be merged, so if you say are defragging an extent with 5k snapshots pointing to it we will thrash the delayed ref lock because we need to go back and manually merge these things together. Instead we want to process quota changes when we know they are going to happen, like when we first allocate an extent, we free a reference for an extent, we add new references etc. This patch accomplishes this by only adding qgroup operations for real ref changes. We only modify the sequence number when we need to lookup roots for bytenrs, this reduces the amount of churn on the sequence number and allows us to merge delayed refs as we add them most of the time. This patch encompasses a bunch of architectural changes 1) qgroup ref operations: instead of tracking qgroup operations through the delayed refs we simply add new ref operations whenever we notice that we need to when we've modified the refs themselves. 2) tree mod seq: we no longer have this separation of major/minor counters. this makes the sequence number stuff much more sane and we can remove some locking that was needed to protect the counter. 3) delayed ref seq: we now read the tree mod seq number and use that as our sequence. This means each new delayed ref doesn't have it's own unique sequence number, rather whenever we go to lookup backrefs we inc the sequence number so we can make sure to keep any new operations from screwing up our world view at that given point. This allows us to merge delayed refs during runtime. With all of these changes the delayed ref stuff is a little saner and the qgroup accounting stuff no longer goes negative in some cases like it was before. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: use bitfield instead of integer data type for the some variants in ↵Miao Xie2014-06-091-16/+17
| | | | | | | | btrfs_root Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
* btrfs: assert that send is not in progres before root deletionDavid Sterba2014-06-091-13/+0
| | | | | | | CC: Miao Xie <miaox@cn.fujitsu.com> CC: Wang Shilong <wangsl.fnst@cn.fujitsu.com> Signed-off-by: David Sterba <dsterba@suse.cz> Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: remove transaction from sendJosef Bacik2014-04-061-17/+28
| | | | | | | | | | | | | | | | | | | | Lets try this again. We can deadlock the box if we send on a box and try to write onto the same fs with the app that is trying to listen to the send pipe. This is because the writer could get stuck waiting for a transaction commit which is being blocked by the send. So fix this by making sure looking at the commit roots is always going to be consistent. We do this by keeping track of which roots need to have their commit roots swapped during commit, and then taking the commit_root_sem and swapping them all at once. Then make sure we take a read lock on the commit_root_sem in cases where we search the commit root to make sure we're always looking at a consistent view of the commit roots. Previously we had problems with this because we would swap a fs tree commit root and then swap the extent tree commit root independently which would cause the backref walking code to screw up sometimes. With this patch we no longer deadlock and pass all the weird send/receive corner cases. Thanks, Reportedy-by: Hugo Mills <hugo@carfax.org.uk> Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: don't clear uptodate if the eb is under IOJosef Bacik2014-04-061-1/+2
| | | | | | | | | | | | | | | | | | | | | | | So I have an awful exercise script that will run snapshot, balance and send/receive in parallel. This sometimes would crash spectacularly and when it came back up the fs would be completely hosed. Turns out this is because of a bad interaction of balance and send/receive. Send will hold onto its entire path for the whole send, but its blocks could get relocated out from underneath it, and because it doesn't old tree locks theres nothing to keep this from happening. So it will go to read in a slot with an old transid, and we could have re-allocated this block for something else and it could have a completely different transid. But because we think it is invalid we clear uptodate and re-read in the block. If we do this before we actually write out the new block we could write back stale data to the fs, and boom we're screwed. Now we definitely need to fix this disconnect between send and balance, but we really really need to not allow ourselves to accidently read in stale data over new data. So make sure we check if the extent buffer is not under io before clearing uptodate, this will kick back EIO to the caller instead of reading in stale data and keep us from corrupting the fs. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: fix deadlock with nested trans handlesJosef Bacik2014-03-201-10/+4
| | | | | | | | | | | | | | | | | | | | | | | | | Zach found this deadlock that would happen like this btrfs_end_transaction <- reduce trans->use_count to 0 btrfs_run_delayed_refs btrfs_cow_block find_free_extent btrfs_start_transaction <- increase trans->use_count to 1 allocate chunk btrfs_end_transaction <- decrease trans->use_count to 0 btrfs_run_delayed_refs lock tree block we are cowing above ^^ We need to only decrease trans->use_count if it is above 1, otherwise leave it alone. This will make nested trans be the only ones who decrease their added ref, and will let us get rid of the trans->use_count++ hack if we have to commit the transaction. Thanks, cc: stable@vger.kernel.org Reported-by: Zach Brown <zab@redhat.com> Signed-off-by: Josef Bacik <jbacik@fb.com> Tested-by: Zach Brown <zab@redhat.com> Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: don't flush all delalloc inodes when we doesn't get s_umount lockMiao Xie2014-03-101-1/+1
| | | | | | | | We needn't flush all delalloc inodes when we doesn't get s_umount lock, or we would make the tasks wait for a long time. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fb.com>
* Btrfs: cancel scrub on transaction abortionWang Shilong2014-03-101-0/+1
| | | | | | | | | If we fail to commit transaction, we'd better cancel scrub operations. Suggested-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fb.com>
* Btrfs: fix a possible deadlock between scrub and transaction committingWang Shilong2014-03-101-11/+11
| | | | | | | | btrfs_scrub_continue() will be called when cleaning up transaction.However, this can only be called if btrfs_scrub_pause() is called before. Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fb.com>
* btrfs: Add noinode_cache mount optionQu Wenruo2014-01-281-0/+9
| | | | | | | | | | | | | | | | | | | | | | | | | Add noinode_cache mount option for btrfs. Since inode map cache involves all the btrfs_find_free_ino/return_ino things and if just trigger the mount_opt, an inode number get from inode map cache will not returned to inode map cache. To keep the find and return inode both in the same behavior, a new bit in mount_opt, CHANGE_INODE_CACHE, is introduced for this idea. CHANGE_INODE_CACHE is set/cleared in remounting, and the original INODE_MAP_CACHE is set/cleared according to CHANGE_INODE_CACHE after a success transaction. Since find/return inode is all done between btrfs_start_transaction and btrfs_commit_transaction, this will keep consistent behavior. Also noinode_cache mount option will not stop the caching_kthread. Cc: David Sterba <dsterba@suse.cz> Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: throttle delayed refs betterJosef Bacik2014-01-281-2/+2
| | | | | | | | | | | | | | | | | | | On one of our gluster clusters we noticed some pretty big lag spikes. This turned out to be because our transaction commit was taking like 3 minutes to complete. This is because we have like 30 gigs of metadata, so our global reserve would end up being the max which is like 512 mb. So our throttling code would allow a ridiculous amount of delayed refs to build up and then they'd all get run at transaction commit time, and for a cold mounted file system that could take up to 3 minutes to run. So fix the throttling to be based on both the size of the global reserve and how long it takes us to run delayed refs. This patch tracks the time it takes to run delayed refs and then only allows 1 seconds worth of outstanding delayed refs at a time. This way it will auto-tune itself from cold cache up to when everything is in memory and it no longer has to go to disk. This makes our transaction commits take much less time to run. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: attach delayed ref updates to delayed ref headsJosef Bacik2014-01-281-6/+1
| | | | | | | | | | | | | | | | | | | | | | | Currently we have two rb-trees, one for delayed ref heads and one for all of the delayed refs, including the delayed ref heads. When we process the delayed refs we have to hold onto the delayed ref lock for all of the selecting and merging and such, which results in quite a bit of lock contention. This was solved by having a waitqueue and only one flusher at a time, however this hurts if we get a lot of delayed refs queued up. So instead just have an rb tree for the delayed ref heads, and then attach the delayed ref updates to an rb tree that is per delayed ref head. Then we only need to take the delayed ref lock when adding new delayed refs and when selecting a delayed ref head to process, all the rest of the time we deal with a per delayed ref head lock which will be much less contentious. The locking rules for this get a little more complicated since we have to lock up to 3 things to properly process delayed refs, but I will address that problem later. For now this passes all of xfstests and my overnight stress tests. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: make fsync latency less suckyJosef Bacik2014-01-281-1/+2
| | | | | | | | | | | | | | Looking into some performance related issues with large amounts of metadata revealed that we can have some pretty huge swings in fsync() performance. If we have a lot of delayed refs backed up (as you will tend to do with lots of metadata) fsync() will wander off and try to run some of those delayed refs which can result in reading from disk and such. Since the actual act of fsync() doesn't create any delayed refs there is no need to make it throttle on delayed ref stuff, that will be handled by other people. With this patch we get much smoother fsync performance with large amounts of metadata. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: fix protection between send and root deletionWang Shilong2014-01-281-0/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | We should gurantee that parent and clone roots can not be destroyed during send, for this we have two ideas. 1.by holding @subvol_sem, this might be a nightmare, because it will block all subvolumes deletion for a long time. 2.Miao pointed out we can reuse @send_in_progress, that mean we will skip snapshot deletion if root sending is in progress. Here we adopt the second approach since it won't block other subvolumes deletion for a long time. Besides in btrfs_clean_one_deleted_snapshot(), we only check first root , if this root is involved in send, we return directly rather than continue to check.There are several reasons about it: 1.this case happen seldomly. 2.after sending,cleaner thread can continue to drop that root. 3.make code simple Cc: David Sterba <dsterba@suse.cz> Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com> Reviewed-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: remove btrfs_end_transaction_dmeta()Miao Xie2014-01-281-6/+0
| | | | | | | | | | | | | | Two reasons: - btrfs_end_transaction_dmeta() is the same as btrfs_end_transaction_throttle() so it is unnecessary. - All the delayed items should be dealt in the current transaction, so the workers should not commit the transaction, instead, deal with the delayed items as many as possible. So we can remove btrfs_end_transaction_dmeta() Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: convert printk to btrfs_ and fix BTRFS prefixFrank Holton2014-01-281-4/+4
| | | | | | | | | | Convert all applicable cases of printk and pr_* to the btrfs_* macros. Fix all uses of the BTRFS prefix. Signed-off-by: Frank Holton <fholton@gmail.com> Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: wrap repeated code into scrub_blocked_if_needed()Wang Shilong2014-01-281-1/+2
| | | | | | | | | | | | | | | | | | | | | | Just wrap same code into one function scrub_blocked_if_needed(). This make a change that we will move waiting (@workers_pending = 0) before we can wake up commiting transaction(atomic_inc(@scrub_paused)), we must take carefully to not deadlock here. Thread 1 Thread 2 |->btrfs_commit_transaction() |->set trans type(COMMIT_DOING) |->btrfs_scrub_paused()(blocked) |->join_transaction(blocked) Move btrfs_scrub_paused() before setting trans type which means we can still join a transaction when commiting_transaction is blocked. Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com> Suggested-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: introduce a head ref rbtreeLiu Bo2014-01-281-1/+3
| | | | | | | | | | | | | | | | | | | | | The way how we process delayed refs is 1) get a bunch of head refs, 2) pick up one head ref, 3) go one node back for any delayed ref updates. The head ref is also linked in the same rbtree as the delayed ref is, so in 1) stage, we have to walk one by one including not only head refs, but delayed refs. When we have a great number of delayed refs pending to process, this'll cost time a lot. Here we introduce a head ref specific rbtree, it only has head refs, so troubles go away. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <clm@fb.com>
* Btrfs: fix lockdep error in async commitLiu Bo2013-11-201-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Lockdep complains about btrfs's async commit: [ 2372.462171] [ BUG: bad unlock balance detected! ] [ 2372.462191] 3.12.0+ #32 Tainted: G W [ 2372.462209] ------------------------------------- [ 2372.462228] ceph-osd/14048 is trying to release lock (sb_internal) at: [ 2372.462275] [<ffffffffa022cb10>] btrfs_commit_transaction_async+0x1b0/0x2a0 [btrfs] [ 2372.462305] but there are no more locks to release! [ 2372.462324] [ 2372.462324] other info that might help us debug this: [ 2372.462349] no locks held by ceph-osd/14048. [ 2372.462367] [ 2372.462367] stack backtrace: [ 2372.462386] CPU: 2 PID: 14048 Comm: ceph-osd Tainted: G W 3.12.0+ #32 [ 2372.462414] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./To be filled by O.E.M., BIOS 080015 11/09/2011 [ 2372.462455] ffffffffa022cb10 ffff88007490fd28 ffffffff816f094a ffff8800378aa320 [ 2372.462491] ffff88007490fd50 ffffffff810adf4c ffff8800378aa320 ffff88009af97650 [ 2372.462526] ffffffffa022cb10 ffff88007490fd88 ffffffff810b01ee ffff8800898c0000 [ 2372.462562] Call Trace: [ 2372.462584] [<ffffffffa022cb10>] ? btrfs_commit_transaction_async+0x1b0/0x2a0 [btrfs] [ 2372.462619] [<ffffffff816f094a>] dump_stack+0x45/0x56 [ 2372.462642] [<ffffffff810adf4c>] print_unlock_imbalance_bug+0xec/0x100 [ 2372.462677] [<ffffffffa022cb10>] ? btrfs_commit_transaction_async+0x1b0/0x2a0 [btrfs] [ 2372.462710] [<ffffffff810b01ee>] lock_release+0x18e/0x210 [ 2372.462742] [<ffffffffa022cb36>] btrfs_commit_transaction_async+0x1d6/0x2a0 [btrfs] [ 2372.462783] [<ffffffffa025a7ce>] btrfs_ioctl_start_sync+0x3e/0xc0 [btrfs] [ 2372.462822] [<ffffffffa025f1d3>] btrfs_ioctl+0x4c3/0x1f70 [btrfs] [ 2372.462849] [<ffffffff812c0321>] ? avc_has_perm+0x121/0x1b0 [ 2372.462873] [<ffffffff812c0224>] ? avc_has_perm+0x24/0x1b0 [ 2372.462897] [<ffffffff8107ecc8>] ? sched_clock_cpu+0xa8/0x100 [ 2372.462922] [<ffffffff8117b145>] do_vfs_ioctl+0x2e5/0x4e0 [ 2372.462946] [<ffffffff812c19e6>] ? file_has_perm+0x86/0xa0 [ 2372.462969] [<ffffffff8117b3c1>] SyS_ioctl+0x81/0xa0 [ 2372.462991] [<ffffffff817045a4>] tracesys+0xdd/0xe2 ==================================================== It's because that we don't do the right thing when checking if it's ok to tell lockdep that we're trying to release the rwsem. If the trans handle's type is TRANS_ATTACH, we won't acquire the freeze rwsem, but as TRANS_ATTACH fits the check (trans < TRANS_JOIN_NOLOCK), we'll release the freeze rwsem, which makes lockdep complains a lot. Reported-by: Ma Jianpeng <majianpeng@gmail.com> Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: rename btrfs_start_all_delalloc_inodesMiao Xie2013-11-111-1/+1
| | | | | | | | | | rename the function -- btrfs_start_all_delalloc_inodes(), and make its name be compatible to btrfs_wait_ordered_roots(), since they are always used at the same place. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: don't wait for the completion of all the ordered extentsMiao Xie2013-11-111-1/+1
| | | | | | | | | | | It is very likely that there are lots of ordered extents in the filesytem, if we wait for the completion of all of them when we want to reclaim some space for the metadata space reservation, we would be blocked for a long time. The performance would drop down suddenly for a long time. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: fix memory leaks on transaction commit failureFilipe David Borba Manana2013-11-111-4/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Structures of the types tree_mod_elem and qgroup_update are allocated during transaction commit but were not being released if the call to btrfs_run_delayed_items() returned an error. Stack trace reported by kmemleak: unreferenced object 0xffff880679f0b398 (size 128): comm "umount", pid 21508, jiffies 4295967793 (age 36718.112s) hex dump (first 32 bytes): 60 b5 f0 79 06 88 ff ff 00 00 00 00 00 00 00 00 `..y............ 00 00 00 00 00 00 00 00 50 1c 00 00 00 00 00 00 ........P....... backtrace: [<ffffffff81742d26>] kmemleak_alloc+0x26/0x50 [<ffffffff811889c2>] kmem_cache_alloc_trace+0x112/0x200 [<ffffffffa046f2d3>] tree_mod_log_insert_key.constprop.45+0x93/0x150 [btrfs] [<ffffffffa04720f9>] __btrfs_cow_block+0x299/0x4f0 [btrfs] [<ffffffffa0472510>] btrfs_cow_block+0x120/0x1f0 [btrfs] [<ffffffffa0476679>] btrfs_search_slot+0x449/0x930 [btrfs] [<ffffffffa048eecf>] btrfs_lookup_inode+0x2f/0xa0 [btrfs] [<ffffffffa04eb49c>] __btrfs_update_delayed_inode+0x1c/0x1d0 [btrfs] [<ffffffffa04eb9e2>] __btrfs_run_delayed_items+0x162/0x1e0 [btrfs] [<ffffffffa04eba63>] btrfs_delayed_inode_exit+0x3/0x20 [btrfs] [<ffffffffa0499c63>] btrfs_commit_transaction+0x203/0xa50 [btrfs] [<ffffffffa046b519>] btrfs_sync_fs+0x69/0x110 [btrfs] [<ffffffff811cb210>] __sync_filesystem+0x30/0x60 [<ffffffff811cb2bb>] sync_filesystem+0x4b/0x70 [<ffffffff8119ce7b>] generic_shutdown_super+0x3b/0xf0 [<ffffffff8119cfc6>] kill_anon_super+0x16/0x30 unreferenced object 0xffff880677e0dd88 (size 32): comm "umount", pid 21508, jiffies 4295967793 (age 36718.112s) hex dump (first 32 bytes): 78 75 11 a9 06 88 ff ff 00 c0 e0 77 06 88 ff ff xu.........w.... 40 c3 a2 70 06 88 ff ff 00 00 00 00 00 00 00 00 @..p............ backtrace: [<ffffffff81742d26>] kmemleak_alloc+0x26/0x50 [<ffffffff811889c2>] kmem_cache_alloc_trace+0x112/0x200 [<ffffffffa04fa54f>] btrfs_qgroup_record_ref+0xf/0x90 [btrfs] [<ffffffffa04e1914>] btrfs_add_delayed_tree_ref+0xf4/0x170 [btrfs] [<ffffffffa048518a>] btrfs_free_tree_block+0x9a/0x220 [btrfs] [<ffffffffa0472163>] __btrfs_cow_block+0x303/0x4f0 [btrfs] [<ffffffffa0472510>] btrfs_cow_block+0x120/0x1f0 [btrfs] [<ffffffffa0476679>] btrfs_search_slot+0x449/0x930 [btrfs] [<ffffffffa048eecf>] btrfs_lookup_inode+0x2f/0xa0 [btrfs] [<ffffffffa04eb49c>] __btrfs_update_delayed_inode+0x1c/0x1d0 [btrfs] [<ffffffffa04eb9e2>] __btrfs_run_delayed_items+0x162/0x1e0 [btrfs] [<ffffffffa04eba63>] btrfs_delayed_inode_exit+0x3/0x20 [btrfs] [<ffffffffa0499c63>] btrfs_commit_transaction+0x203/0xa50 [btrfs] [<ffffffffa046b519>] btrfs_sync_fs+0x69/0x110 [btrfs] [<ffffffff811cb210>] __sync_filesystem+0x30/0x60 [<ffffffff811cb2bb>] sync_filesystem+0x4b/0x70 Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: fix BUG_ON() casued by the reserved space migrationMiao Xie2013-11-111-1/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When we did space balance and snapshot creation at the same time, we might meet the following oops: kernel BUG at fs/btrfs/inode.c:3038! [SNIP] Call Trace: [<ffffffffa0411ec7>] btrfs_orphan_cleanup+0x293/0x407 [btrfs] [<ffffffffa042dc45>] btrfs_mksubvol.isra.28+0x259/0x373 [btrfs] [<ffffffffa042de85>] btrfs_ioctl_snap_create_transid+0x126/0x156 [btrfs] [<ffffffffa042dff1>] btrfs_ioctl_snap_create_v2+0xd0/0x121 [btrfs] [<ffffffffa0430b2c>] btrfs_ioctl+0x414/0x1854 [btrfs] [<ffffffff813b60b7>] ? __do_page_fault+0x305/0x379 [<ffffffff811215a9>] vfs_ioctl+0x1d/0x39 [<ffffffff81121d7c>] do_vfs_ioctl+0x32d/0x3e2 [<ffffffff81057fe7>] ? finish_task_switch+0x80/0xb8 [<ffffffff81121e88>] SyS_ioctl+0x57/0x83 [<ffffffff813b39ff>] ? do_device_not_available+0x12/0x14 [<ffffffff813b99c2>] system_call_fastpath+0x16/0x1b [SNIP] RIP [<ffffffffa040da40>] btrfs_orphan_add+0xc3/0x126 [btrfs] The reason of the problem is that the relocation root creation stole the reserved space, which was reserved for orphan item deletion. There are several ways to fix this problem, one is to increasing the reserved space size of the space balace, and then we can use that space to create the relocation tree for each fs/file trees. But it is hard to calculate the suitable size because we doesn't know how many fs/file trees we need relocate. We fixed this problem by reserving the space for relocation root creation actively since the space it need is very small (one tree block, used for root node copy), then we use that reserved space to create the relocation tree. If we don't reserve space for relocation tree creation, we will use the reserved space of the balance. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: fix two use-after-free bugs with transaction cleanupJosef Bacik2013-11-111-11/+11
| | | | | | | | | | | | | | | | | | | | | | | | I was noticing the slab redzone stuff going off every once and a while during transaction aborts. This was caused by two things 1) We would walk the pending snapshots and set their error to -ECANCELED. We don't need to do this, the snapshot stuff waits for a transaction commit and if there is a problem we just free our pending snapshot object and exit. Doing this was causing us to touch the pending snapshot object after the thing had already been freed. 2) We were freeing the transaction manually with wanton disregard for it's use_count reference counter. To fix this I cleaned up the transaction freeing loop to either wait for the transaction commit to finish if it was in the middle of that (since it will be cleaned and freed up there) or to do the cleanup oursevles. I also moved the global "kill all things dirty everywhere" stuff outside of the transaction cleanup loop since that only needs to be done once. With this patch I'm no longer seeing slab corruption because of use after frees. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: remove all BUG_ON()'s from commit_cowonly_rootsJosef Bacik2013-11-111-5/+8
| | | | | | | Noticed this when forcing errors to happen during delayed ref running. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: cleanup transaction on abortJosef Bacik2013-11-111-1/+3
| | | | | | | | | | | | | If we abort not during a transaction commit we won't clean up anything until we unmount. Unfortunately if we abort in the middle of writing out an ordered extent we won't clean it up and if somebody is waiting on that ordered extent they will wait forever. To fix this just make the transaction kthread call the cleanup transaction stuff if it notices theres an error, and make btrfs_end_transaction wake up the transaction kthread if there is an error. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: reset intwrite on transaction abortJosef Bacik2013-11-111-0/+2
| | | | | | | | If we abort a transaction in the middle of a commit we weren't undoing the intwrite locking. This patch fixes that problem. Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: fix transid verify errors when recovering log treeJosef Bacik2013-10-041-5/+2
| | | | | | | | | | | | | | | | If we crash with a log, remount and recover that log, and then crash before we can commit another transaction we will get transid verify errors on the next mount. This is because we were not zero'ing out the log when we committed the transaction after recovery. This is ok as long as we commit another transaction at some point in the future, but if you abort or something else goes wrong you can end up in this weird state because the recovery stuff says that the tree log should have a generation+1 of the super generation, which won't be the case of the transaction that was started for recovery. Fix this by removing the check and _always_ zero out the log portion of the super when we commit a transaction. This fixes the transid verify issues I was seeing with my force errors tests. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* Btrfs: kill delay_iput arg to the wait_ordered functionsJosef Bacik2013-09-211-1/+1
| | | | | | | | | | | This is a left over of how we used to wait for ordered extents, which was to grab the inode and then run filemap flush on it. However if we have an ordered extent then we already are holding a ref on the inode, and we just use btrfs_start_ordered_extent anyway, so there is no reason to have an extra ref on the inode to start work on the ordered extent. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: Remove superfluous casts from u64 to unsigned long longGeert Uytterhoeven2013-09-011-2/+1
| | | | | | | | | u64 is "unsigned long long" on all architectures now, so there's no need to cast it when formatting it using the "ll" length modifier. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: check UUID tree during mount if requiredStefan Behrens2013-09-011-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | If the filesystem was mounted with an old kernel that was not aware of the UUID tree, this is detected by looking at the uuid_tree_generation field of the superblock (similar to how the free space cache is doing it). If a mismatch is detected at mount time, a thread is started that does two things: 1. Iterate through the UUID tree, check each entry, delete those entries that are not valid anymore (i.e., the subvol does not exist anymore or the value changed). 2. Iterate through the root tree, for each found subvolume, add the UUID tree entries for the subvolume (if they are not already there). This mechanism is also used to handle and repair errors that happened during the initial creation and filling of the tree. The update of the uuid_tree_generation field (which indicates that the state of the UUID tree is up to date) is blocked until all create and repair operations are successfully completed. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: introduce uuid-tree-gen fieldStefan Behrens2013-09-011-0/+1
| | | | | | | | | | | In order to be able to detect the case that a filesystem is mounted with an old kernel, add a uuid-tree-gen field like the free space cache is doing it. It is part of the super block and written with each commit. Old kernels do not know this field and don't update it. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: maintain subvolume items in the UUID treeStefan Behrens2013-09-011-1/+19
| | | | | | | | | | | | | | | | | When a new subvolume or snapshot is created, a new UUID item is added to the UUID tree. Such items are removed when the subvolume is deleted. The ioctl to set the received subvolume UUID is also touched and will now also add this received UUID into the UUID tree together with the ID of the subvolume. The latter is also done when read-only snapshots are created which inherit all the send/receive information from the parent subvolume. User mode programs use the BTRFS_IOC_TREE_SEARCH ioctl to search and read in the UUID tree. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* btrfs: mark some local function as 'static'Sergei Trofimovich2013-09-011-1/+1
| | | | | | | | Cc: Josef Bacik <jbacik@fusionio.com> Cc: Chris Mason <chris.mason@fusionio.com> Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: don't bug_on when we fail when cleaning up transactionsJosef Bacik2013-09-011-2/+1
| | | | | | | There is no reason for this sort of jackassery. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* btrfs: Cleanup for using BTRFS_SETGET_STACK instead of raw convertQu Wenruo2013-09-011-2/+2
| | | | | | | | | | | | | | Some codes still use the cpu_to_lexx instead of the BTRFS_SETGET_STACK_FUNCS declared in ctree.h. Also added some BTRFS_SETGET_STACK_FUNCS for btrfs_header btrfs_timespec and other structures. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Reviewed-by: Miao Xie <miaoxie@cn.fujitsu.com> Reviewed-by: David Sterba <dsterba@suse.cz> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: check to see if root_list is empty before adding it to dead rootsJosef Bacik2013-08-091-4/+4
| | | | | | | | | | A user reported a panic when running with autodefrag and deleting snapshots. This is because we could end up trying to add the root to the dead roots list twice. To fix this check to see if we are empty before adding ourselves to the dead roots list. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Btrfs: make the chunk allocator completely tree locklessJosef Bacik2013-07-021-0/+9
| | | | | | | | | | | | | | | | | | | | | | | | When adjusting the enospc rules for relocation I ran into a deadlock because we were relocating the only system chunk and that forced us to try and allocate a new system chunk while holding locks in the chunk tree, which caused us to deadlock. To fix this I've moved all of the dev extent addition and chunk addition out to the delayed chunk completion stuff. We still keep the in-memory stuff which makes sure everything is consistent. One change I had to make was to search the commit root of the device tree to find a free dev extent, and hold onto any chunk em's that we allocated in that transaction so we do not allocate the same dev extent twice. This has the side effect of fixing a bug with balance that has been there ever since balance existed. Basically you can free a block group and it's dev extent and then immediately allocate that dev extent for a new block group and write stuff to that dev extent, all within the same transaction. So if you happen to crash during a balance you could come back to a completely broken file system. This patch should keep these sort of things from happening in the future since we won't be able to allocate free'd dev extents until after the transaction commits. This has passed all of the xfstests and my super annoying stress test followed by a balance. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* Btrfs: fix the comment typo for btrfs_attach_transaction_barrierWang Sheng-Hui2013-07-011-1/+1
| | | | | | | | | The comment is for btrfs_attach_transaction_barrier, not for btrfs_attach_transaction. Fix the typo. Signed-off-by: Wang Sheng-Hui <shhuiw@gmail.com> Acked-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* Btrfs: fix transaction throttling for delayed refsJosef Bacik2013-07-011-14/+10
| | | | | | | | | | | | | | | | | Dave has this fs_mark script that can make btrfs abort with sufficient amount of ram. This is because with more ram we can keep more dirty metadata in cache which in a round about way makes for many more pending delayed refs. What happens is we end up not throttling the transaction enough so when we go to commit the transaction when we've completely filled the file system we'll abort() because we use all of the space in the global reserve and we still have delayed refs to run. To fix this we need to make the delayed ref flushing and the transaction throttling dependant upon the number of delayed refs that we have instead of how much reserved space is left in the global reserve. With this patch we not only stop aborting transactions but we also get a smoother run speed with fs_mark and it makes us about 10% faster. Thanks, Reported-by: David Sterba <dsterba@suse.cz> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* Btrfs: stop waiting on current trans if we abortedJosef Bacik2013-07-011-4/+8
| | | | | | | | | | | | | | | I hit a hang when run_delayed_refs returned an error in the beginning of btrfs_commit_transaction. If we decide we need to commit the transaction in btrfs_end_transaction we'll set BLOCKED and start to commit, but if we get an error this early on we'll just exit without committing. This is fine, except that anybody else who tried to start a transaction will sit in wait_current_trans() since we're set to BLOCKED and we never set it to something else and woke people up. To fix this we want to check for trans->aborted everywhere we wait for the transaction state to change, and make btrfs_abort_transaction() wake up any waiters there may be. All the callers will notice that the transaction has aborted and exit out properly. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* Btrfs: merge pending IO for tree log write backMiao Xie2013-06-141-3/+3
| | | | | | | | | | | | | | | | | | Before applying this patch, we flushed the log tree of the fs/file tree firstly, and then flushed the log root tree. It is ineffective, especially on the hard disk. This patch improved this problem by wrapping the above two flushes by the same blk_plug. By test, the performance of the sync write went up ~60%(2.9MB/s -> 4.6MB/s) on my scsi disk whose disk buffer was enabled. Test step: # mkfs.btrfs -f -m single <disk> # mount <disk> <mnt> # dd if=/dev/zero of=<mnt>/file0 bs=32K count=1024 oflag=sync Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
* Btrfs: make the state of the transaction more readableMiao Xie2013-06-141-71/+86
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We used 3 variants to track the state of the transaction, it was complex and wasted the memory space. Besides that, it was hard to understand that which types of the transaction handles should be blocked in each transaction state, so the developers often made mistakes. This patch improved the above problem. In this patch, we define 6 states for the transaction, enum btrfs_trans_state { TRANS_STATE_RUNNING = 0, TRANS_STATE_BLOCKED = 1, TRANS_STATE_COMMIT_START = 2, TRANS_STATE_COMMIT_DOING = 3, TRANS_STATE_UNBLOCKED = 4, TRANS_STATE_COMPLETED = 5, TRANS_STATE_MAX = 6, } and just use 1 variant to track those state. In order to make the blocked handle types for each state more clear, we introduce a array: unsigned int btrfs_blocked_trans_types[TRANS_STATE_MAX] = { [TRANS_STATE_RUNNING] = 0U, [TRANS_STATE_BLOCKED] = (__TRANS_USERSPACE | __TRANS_START), [TRANS_STATE_COMMIT_START] = (__TRANS_USERSPACE | __TRANS_START | __TRANS_ATTACH), [TRANS_STATE_COMMIT_DOING] = (__TRANS_USERSPACE | __TRANS_START | __TRANS_ATTACH | __TRANS_JOIN), [TRANS_STATE_UNBLOCKED] = (__TRANS_USERSPACE | __TRANS_START | __TRANS_ATTACH | __TRANS_JOIN | __TRANS_JOIN_NOLOCK), [TRANS_STATE_COMPLETED] = (__TRANS_USERSPACE | __TRANS_START | __TRANS_ATTACH | __TRANS_JOIN | __TRANS_JOIN_NOLOCK), } it is very intuitionistic. Besides that, because we remove ->in_commit in transaction structure, so the lock ->commit_lock which was used to protect it is unnecessary, remove ->commit_lock. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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