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linux/fs/btrfs
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Josef Bacik 3bbb24b20a Btrfs: fix deadlock with nested trans handles 
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>
2014-03-20 17:15:27 -07:00
..
tests Btrfs: convert printk to btrfs_ and fix BTRFS prefix 2014-01-28 13:20:05 -08:00
acl.c btrfs: remove dead code 2014-01-28 13:19:50 -08:00
async-thread.c btrfs: Add ftrace for btrfs_workqueue 2014-03-10 15:17:21 -04:00
async-thread.h btrfs: Cleanup the btrfs_workqueue related function type 2014-03-10 15:17:20 -04:00
backref.c Btrfs: skip locking when searching commit root 2014-03-10 15:16:55 -04:00
backref.h Btrfs: allocate prelim_ref with a slab allocater 2013-09-01 08:16:27 -04:00
btrfs_inode.h Btrfs: use signed integer instead of unsigned long integer for log transid 2014-03-10 15:16:42 -04:00
check-integrity.c Btrfs: use btrfs_crc32c everywhere instead of libcrc32c 2014-02-03 09:01:27 -08:00
check-integrity.h block: submit_bio_wait() conversions 2013-11-24 16:33:41 -07:00
compression.c Btrfs: fix data corruption when reading/updating compressed extents 2014-02-08 17:57:15 -08:00
compression.h
ctree.c Btrfs: correctly determine if blocks are shared in btrfs_compare_trees 2014-03-10 15:16:50 -04:00
ctree.h Btrfs: fix possible empty list access when flushing the delalloc inodes 2014-03-10 15:17:29 -04:00
delayed-inode.c btrfs: Cleanup the "_struct" suffix in btrfs_workequeue 2014-03-10 15:17:16 -04:00
delayed-inode.h Btrfs: introduce the delayed inode ref deletion for the single link inode 2014-01-28 13:20:09 -08:00
delayed-ref.c Btrfs: cleanup delayed-ref.c:find_ref_head() 2014-03-10 15:16:46 -04:00
delayed-ref.h Btrfs: attach delayed ref updates to delayed ref heads 2014-01-28 13:20:25 -08:00
dev-replace.c Btrfs: don't flush all delalloc inodes when we doesn't get s_umount lock 2014-03-10 15:17:27 -04:00
dev-replace.h
dir-item.c Btrfs: convert printk to btrfs_ and fix BTRFS prefix 2014-01-28 13:20:05 -08:00
disk-io.c Btrfs: fix possible empty list access when flushing the delalloc inodes 2014-03-10 15:17:29 -04:00
disk-io.h Btrfs: add a sanity test for btrfs_split_item 2013-11-11 21:51:02 -05:00
export.c btrfs: remove fs/btrfs/compat.h 2013-11-11 22:03:19 -05:00
export.h
extent-tree.c Btrfs: don't flush all delalloc inodes when we doesn't get s_umount lock 2014-03-10 15:17:27 -04:00
extent_io.c Btrfs: more efficient split extent state insertion 2014-03-10 15:16:57 -04:00
extent_io.h Btrfs: move the extent buffer radix tree into the fs_info 2014-01-28 13:19:55 -08:00
extent_map.c Btrfs: more efficient btrfs_drop_extent_cache 2014-03-10 15:16:57 -04:00
extent_map.h Btrfs: more efficient btrfs_drop_extent_cache 2014-03-10 15:16:57 -04:00
file-item.c Btrfs: convert printk to btrfs_ and fix BTRFS prefix 2014-01-28 13:20:05 -08:00
file.c Btrfs: remove the unnecessary flush when preparing the pages 2014-03-10 15:17:25 -04:00
free-space-cache.c Btrfs: convert printk to btrfs_ and fix BTRFS prefix 2014-01-28 13:20:05 -08:00
free-space-cache.h Btrfs: remove path arg from btrfs_truncate_free_space_cache 2013-11-11 21:51:33 -05:00
hash.c Btrfs: fix btrfs boot when compiled as built-in 2014-01-28 13:20:31 -08:00
hash.h Btrfs: fix btrfs boot when compiled as built-in 2014-01-28 13:20:31 -08:00
inode-item.c btrfs: cleanup: removed unused 'btrfs_get_inode_ref_index' 2014-01-28 13:19:39 -08:00
inode-map.c btrfs: Use WARN_ON()'s return value in place of WARN_ON(1) 2013-11-11 22:11:53 -05:00
inode-map.h
inode.c Btrfs: fix possible empty list access when flushing the delalloc inodes 2014-03-10 15:17:29 -04:00
ioctl.c Btrfs: don't flush all delalloc inodes when we doesn't get s_umount lock 2014-03-10 15:17:27 -04:00
Kconfig Btrfs: fix btrfs boot when compiled as built-in 2014-01-28 13:20:31 -08:00
locking.c
locking.h
lzo.c Btrfs: convert printk to btrfs_ and fix BTRFS prefix 2014-01-28 13:20:05 -08:00
Makefile Btrfs: fix btrfs boot when compiled as built-in 2014-01-28 13:20:31 -08:00
math.h
ordered-data.c Btrfs: split the global ordered extents mutex 2014-03-10 15:17:28 -04:00
ordered-data.h btrfs: Cleanup the "_struct" suffix in btrfs_workequeue 2014-03-10 15:17:16 -04:00
orphan.c btrfs: expand btrfs_find_item() to include find_orphan_item functionality 2014-01-28 13:19:37 -08:00
print-tree.c Btrfs: don't use ram_bytes for uncompressed inline items 2014-01-29 07:06:29 -08:00
print-tree.h
props.c Btrfs: add support for inode properties 2014-01-28 13:20:24 -08:00
props.h Btrfs: add support for inode properties 2014-01-28 13:20:24 -08:00
qgroup.c btrfs: Cleanup the "_struct" suffix in btrfs_workequeue 2014-03-10 15:17:16 -04:00
raid56.c btrfs: Cleanup the "_struct" suffix in btrfs_workequeue 2014-03-10 15:17:16 -04:00
raid56.h
rcu-string.h
reada.c btrfs: Cleanup the "_struct" suffix in btrfs_workequeue 2014-03-10 15:17:16 -04:00
relocation.c Btrfs: don't flush all delalloc inodes when we doesn't get s_umount lock 2014-03-10 15:17:27 -04:00
root-tree.c btrfs: Use PTR_ERR_OR_ZERO 2014-03-10 15:16:51 -04:00
scrub.c btrfs: Cleanup the "_struct" suffix in btrfs_workequeue 2014-03-10 15:17:16 -04:00
send.c Btrfs: add readahead for send_write 2014-03-10 15:17:19 -04:00
send.h
struct-funcs.c
super.c btrfs: Cleanup the old btrfs_worker. 2014-03-10 15:17:15 -04:00
sysfs.c btrfs: add simple debugfs interface 2014-03-10 15:15:51 -04:00
sysfs.h btrfs: add simple debugfs interface 2014-03-10 15:15:51 -04:00
transaction.c Btrfs: fix deadlock with nested trans handles 2014-03-20 17:15:27 -07:00
transaction.h Btrfs: make fsync latency less sucky 2014-01-28 13:20:25 -08:00
tree-defrag.c Btrfs: cleanup dead code of defragment 2013-11-11 21:59:45 -05:00
tree-log.c Btrfs: stop joining the log transaction if sync log fails 2014-03-10 15:16:44 -04:00
tree-log.h Btrfs: just wait or commit our own log sub-transaction 2014-03-10 15:16:43 -04:00
ulist.c Btrfs: do not export ulist functions 2014-01-29 07:06:27 -08:00
ulist.h Btrfs: do not export ulist functions 2014-01-29 07:06:27 -08:00
uuid-tree.c Btrfs: convert printk to btrfs_ and fix BTRFS prefix 2014-01-28 13:20:05 -08:00
volumes.c btrfs: Cleanup the "_struct" suffix in btrfs_workequeue 2014-03-10 15:17:16 -04:00
volumes.h btrfs: Cleanup the "_struct" suffix in btrfs_workequeue 2014-03-10 15:17:16 -04:00
xattr.c Btrfs: add support for inode properties 2014-01-28 13:20:24 -08:00
xattr.h
zlib.c Btrfs: convert printk to btrfs_ and fix BTRFS prefix 2014-01-28 13:20:05 -08:00