btrfs: fix invalid delayed ref after subvolume creation failure

When creating a subvolume, at ioctl.c:create_subvol(), if we fail to
insert the new root's root item into the root tree, we are freeing the
metadata extent we reserved for the new root to prevent a metadata
extent leak, as we don't abort the transaction at that point (since
there is nothing at that point that is irreversible).

However we allocated the metadata extent for the new root which we are
creating for the new subvolume, so its delayed reference refers to the
ID of this new root. But when we free the metadata extent we pass the
root of the subvolume where the new subvolume is located to
btrfs_free_tree_block() - this is incorrect because this will generate
a delayed reference that refers to the ID of the parent subvolume's root,
and not to ID of the new root.

This results in a failure when running delayed references that leads to
a transaction abort and a trace like the following:

[3868.738042] RIP: 0010:__btrfs_free_extent+0x709/0x950 [btrfs]
[3868.739857] Code: 68 0f 85 e6 fb ff (...)
[3868.742963] RSP: 0018:ffffb0e9045cf910 EFLAGS: 00010246
[3868.743908] RAX: 00000000fffffffe RBX: 00000000fffffffe RCX: 0000000000000002
[3868.745312] RDX: 00000000fffffffe RSI: 0000000000000002 RDI: ffff90b0cd793b88
[3868.746643] RBP: 000000000e5d8000 R08: 0000000000000000 R09: ffff90b0cd793b88
[3868.747979] R10: 0000000000000002 R11: 00014ded97944d68 R12: 0000000000000000
[3868.749373] R13: ffff90b09afe4a28 R14: 0000000000000000 R15: ffff90b0cd793b88
[3868.750725] FS:  00007f281c4a8b80(0000) GS:ffff90b3ada00000(0000) knlGS:0000000000000000
[3868.752275] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[3868.753515] CR2: 00007f281c6a5000 CR3: 0000000108a42006 CR4: 0000000000370ee0
[3868.754869] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[3868.756228] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[3868.757803] Call Trace:
[3868.758281]  <TASK>
[3868.758655]  ? btrfs_merge_delayed_refs+0x178/0x1c0 [btrfs]
[3868.759827]  __btrfs_run_delayed_refs+0x2b1/0x1250 [btrfs]
[3868.761047]  btrfs_run_delayed_refs+0x86/0x210 [btrfs]
[3868.762069]  ? lock_acquired+0x19f/0x420
[3868.762829]  btrfs_commit_transaction+0x69/0xb20 [btrfs]
[3868.763860]  ? _raw_spin_unlock+0x29/0x40
[3868.764614]  ? btrfs_block_rsv_release+0x1c2/0x1e0 [btrfs]
[3868.765870]  create_subvol+0x1d8/0x9a0 [btrfs]
[3868.766766]  btrfs_mksubvol+0x447/0x4c0 [btrfs]
[3868.767669]  ? preempt_count_add+0x49/0xa0
[3868.768444]  __btrfs_ioctl_snap_create+0x123/0x190 [btrfs]
[3868.769639]  ? _copy_from_user+0x66/0xa0
[3868.770391]  btrfs_ioctl_snap_create_v2+0xbb/0x140 [btrfs]
[3868.771495]  btrfs_ioctl+0xd1e/0x35c0 [btrfs]
[3868.772364]  ? __slab_free+0x10a/0x360
[3868.773198]  ? rcu_read_lock_sched_held+0x12/0x60
[3868.774121]  ? lock_release+0x223/0x4a0
[3868.774863]  ? lock_acquired+0x19f/0x420
[3868.775634]  ? rcu_read_lock_sched_held+0x12/0x60
[3868.776530]  ? trace_hardirqs_on+0x1b/0xe0
[3868.777373]  ? _raw_spin_unlock_irqrestore+0x3e/0x60
[3868.778280]  ? kmem_cache_free+0x321/0x3c0
[3868.779011]  ? __x64_sys_ioctl+0x83/0xb0
[3868.779718]  __x64_sys_ioctl+0x83/0xb0
[3868.780387]  do_syscall_64+0x3b/0xc0
[3868.781059]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[3868.781953] RIP: 0033:0x7f281c59e957
[3868.782585] Code: 3c 1c 48 f7 d8 4c (...)
[3868.785867] RSP: 002b:00007ffe1f83e2b8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
[3868.787198] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f281c59e957
[3868.788450] RDX: 00007ffe1f83e2c0 RSI: 0000000050009418 RDI: 0000000000000003
[3868.789748] RBP: 00007ffe1f83f300 R08: 0000000000000000 R09: 00007ffe1f83fe36
[3868.791214] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
[3868.792468] R13: 0000000000000003 R14: 00007ffe1f83e2c0 R15: 00000000000003cc
[3868.793765]  </TASK>
[3868.794037] irq event stamp: 0
[3868.794548] hardirqs last  enabled at (0): [<0000000000000000>] 0x0
[3868.795670] hardirqs last disabled at (0): [<ffffffff98294214>] copy_process+0x934/0x2040
[3868.797086] softirqs last  enabled at (0): [<ffffffff98294214>] copy_process+0x934/0x2040
[3868.798309] softirqs last disabled at (0): [<0000000000000000>] 0x0
[3868.799284] ---[ end trace be24c7002fe27747 ]---
[3868.799928] BTRFS info (device dm-0): leaf 241188864 gen 1268 total ptrs 214 free space 469 owner 2
[3868.801133] BTRFS info (device dm-0): refs 2 lock_owner 225627 current 225627
[3868.802056]  item 0 key (237436928 169 0) itemoff 16250 itemsize 33
[3868.802863]          extent refs 1 gen 1265 flags 2
[3868.803447]          ref#0: tree block backref root 1610
(...)
[3869.064354]  item 114 key (241008640 169 0) itemoff 12488 itemsize 33
[3869.065421]          extent refs 1 gen 1268 flags 2
[3869.066115]          ref#0: tree block backref root 1689
(...)
[3869.403834] BTRFS error (device dm-0): unable to find ref byte nr 241008640 parent 0 root 1622  owner 0 offset 0
[3869.405641] BTRFS: error (device dm-0) in __btrfs_free_extent:3076: errno=-2 No such entry
[3869.407138] BTRFS: error (device dm-0) in btrfs_run_delayed_refs:2159: errno=-2 No such entry

Fix this by passing the new subvolume's root ID to btrfs_free_tree_block().
This requires changing the root argument of btrfs_free_tree_block() from
struct btrfs_root * to a u64, since at this point during the subvolume
creation we have not yet created the struct btrfs_root for the new
subvolume, and btrfs_free_tree_block() only needs a root ID and nothing
else from a struct btrfs_root.

This was triggered by test case generic/475 from fstests.

Fixes: 67addf29004c5b ("btrfs: fix metadata extent leak after failure to create subvolume")
CC: stable@vger.kernel.org # 4.4+
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 1b85d98df66b..a7533416370a 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -617,11 +617,12 @@ static noinline int create_subvol(struct user_namespace *mnt_userns,
 		 * Since we don't abort the transaction in this case, free the
 		 * tree block so that we don't leak space and leave the
 		 * filesystem in an inconsistent state (an extent item in the
-		 * extent tree without backreferences). Also no need to have
-		 * the tree block locked since it is not in any tree at this
-		 * point, so no other task can find it and use it.
+		 * extent tree with a backreference for a root that does not
+		 * exists). Also no need to have the tree block locked since it
+		 * is not in any tree at this point, so no other task can find
+		 * it and use it.
 		 */
-		btrfs_free_tree_block(trans, root, leaf, 0, 1);
+		btrfs_free_tree_block(trans, objectid, leaf, 0, 1);
 		free_extent_buffer(leaf);
 		goto fail;
 	}