Hi,
That's because btrfs_del_dir_entries_in_log() will return the real
errno after Andi's
commit, so btrfs_unlink_inode() has to check the return value more seriously.
A patch for this has been sent out.
Regards,
Zhu Yanhai
2010/9/9 Itaru Kitayama <kitay...@cl.bb4u.ne.jp>:
> Hi Chris,
> The latest mmotm on a virtual machine boots, but when I log in I get:
>
> [ 82.276418] ------------[ cut here ]------------
> [ 82.277565] kernel BUG at fs/btrfs/inode.c:2643!
> [ 82.278692] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
> [ 82.280332] last sysfs file:
> /sys/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb2/devnum
> [ 82.282323] CPU 1
> [ 82.282790] Modules linked in: nfs lockd fscache nfs_acl auth_rpcgss
> sunrpc ip6t_REJECT nf_conntrack_ipv6 ip6table_filter ip6_tables ipv6 uinput
> snd_ens1371 gameport snd_rawmidi snd_ac97_codec ac97_bus snd_seq
> snd_seq_device snd_pcm ppdev snd_timer microcode pcspkr snd soundcore
> parport_pc snd_page_alloc i2c_piix4 floppy parport e1000 shpchp i2c_core
> mptspi mptscsih mptbase scsi_transport_spi [last unloaded: speedstep_lib]
> [ 82.293369]
> [ 82.293818] Pid: 5572, comm: gconfd-2 Not tainted 2.6.35-rc6-mm1+ #12
> 440BX Desktop Reference Platform/VMware Virtual Platform
> [ 82.296661] RIP: 0010:[<ffffffff811b0e65>] [<ffffffff811b0e65>]
> btrfs_unlink_inode+0x1bb/0x25e
> [ 82.298629] RSP: 0018:ffff880069f9fc18 EFLAGS: 00010282
> [ 82.299810] RAX: 00000000fffffffe RBX: ffff88005985b250 RCX:
> ffff880002840006
> [ 82.301394] RDX: 0000000000000006 RSI: 0000000000000003 RDI:
> ffff880079b0b0d8
> [ 82.302973] RBP: ffff880069f9fc98 R08: 0000000000000046 R09:
> ffff880069f9fac8
> [ 82.303244] old_dentry database~ new_dentry database
> [ 82.303283] seq number to delete is 14
> [ 82.303331] seq number to delete is 13
> [ 82.304260] old_dentry database~ new_dentry database
> [ 82.304298] seq number to delete is 16
> [ 82.304344] seq number to delete is 15
> [ 82.310183] R10: ffff880069f9fae8 R11: ffff880069f9fae8 R12:
> 00000000fffffffe
> [ 82.311726] R13: ffff88005985b910 R14: ffff88007a232288 R15:
> ffff880079b0b0d8
> [ 82.313286] FS: 00007f27f4ea87c0(0000) GS:ffff880002840000(0000)
> knlGS:0000000000000000
> [ 82.315048] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [ 82.316305] CR2: 00007ff36b92fac0 CR3: 000000006a363000 CR4:
> 00000000000006e0
> [ 82.317912] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> [ 82.319510] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
> 0000000000000400
> [ 82.321171] Process gconfd-2 (pid: 5572, threadinfo ffff880069f9e000, task
> ffff88006a3e8000)
> [ 82.323026] Stack:
> [ 82.323485] ffff88000000000b 00000000ffffffff 0000000000000e03
> ffff880068a260d0
> [ 82.325245] <0> 0000000b69f9fc68 ffff880078f13088 000000000042ba39
> 0000000000000001
> [ 82.327290] <0>
> [ 82.327701] old_dentry .xsession-errors new_dentry .xsession-errors.old
> [ 82.329271] ffff880079b0b300 000000000000042b ffff880069f9fc78
> ffff88005986f4b8
> [ 82.331896] Call Trace:
> [ 82.332454] [<ffffffff811b16cd>] btrfs_rename+0x33b/0x473
> [ 82.333662] [<ffffffff8112cb1f>] vfs_rename+0x225/0x369
> [ 82.334835] [<ffffffff81043bde>] ? get_parent_ip+0x11/0x41
> [ 82.336066] [<ffffffff8112e3cf>] sys_renameat+0x193/0x20c
> [ 82.337274] [<ffffffff810adbcf>] ? check_for_new_grace_period+0xde/0xfa
> [ 82.338738] [<ffffffff810ae37e>] ? __call_rcu+0x138/0x14b
> [ 82.340262] [<ffffffff810ae37e>] ? __call_rcu+0x138/0x14b
> [ 82.341541] [<ffffffff810c6014>] ? time_hardirqs_off+0x1e/0x20
> [ 82.342907] [<ffffffff8148acf9>] ? retint_swapgs+0x13/0x1b
> [ 82.344264] [<ffffffff8148acf9>] ? retint_swapgs+0x13/0x1b
> [ 82.345554] [<ffffffff8107ed21>] ? trace_hardirqs_on_caller+0x11d/0x141
> [ 82.347181] [<ffffffff8112e463>] sys_rename+0x1b/0x1d
> [ 82.348391] [<ffffffff81009d32>] system_call_fastpath+0x16/0x1b
> [ 82.349818] Code: 74 08 85 c0 74 04 0f 0b eb fe 4c 8b 4d c8 8b 4d a4 49 89
> d8 48 8b 55 98 48 8b 7d a8 4c 89 fe e8 35 23 02 00 85 c0 41 89 c4 74 12 <0f>
> 0b eb fe 41 bc f4 ff ff ff eb 06 41 bc fe ff ff ff 4c 89 f7
> [ 82.356109] RIP [<ffffffff811b0e65>] btrfs_unlink_inode+0x1bb/0x25e
> [ 82.357522] RSP <ffff880069f9fc18>
> [ 82.358414] ---[ end trace fe6f359e73694983 ]---
>
> When looking into the log tree, btrfs_lookup_dir_item finds the dir item, but
> btrfs_lookup_dir_index_item fails.
>
> If I revert the following patch, I don't encounter the above problem.
> But I am not certain if I really should revert it as it looks mostly fine.
>
> commit 018db35864fd8d307066485a2753866240c3dace
> Author: Andi Kleen <a...@firstfloor.org>
> Date: Wed Jul 21 00:29:24 2010 +0200
>
> These are all the cases where a variable is set, but not
> read which are really bugs.
>
> - Couple of incorrect error handling fixed.
> - One incorrect use of a allocation policy
> - Some other things
>
> Still needs more review.
>
> Found by gcc 4.6's new warnings.
>
> [a...@linux-foundation.org: fix build. Might have been bitrot]
> Signed-off-by: Andi Kleen <a...@linux.intel.com>
> Cc: Chris Mason <chris.ma...@oracle.com>
> Signed-off-by: Andrew Morton <a...@linux-foundation.org>
>
> diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
> index e9103b3..f0cad5a 100644
> --- a/fs/btrfs/dir-item.c
> +++ b/fs/btrfs/dir-item.c
> @@ -427,5 +427,5 @@ int btrfs_delete_one_dir_name(struct btrfs_trans_handle
> *trans,
> ret = btrfs_truncate_item(trans, root, path,
> item_len - sub_item_len, 1);
> }
> - return 0;
> + return ret;
> }
> diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
> index 32d0940..fb7effa 100644
> --- a/fs/btrfs/extent-tree.c
> +++ b/fs/btrfs/extent-tree.c
> @@ -3337,8 +3337,7 @@ struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct
> btrfs_root *root)
> btrfs_init_block_rsv(block_rsv);
>
> alloc_target = btrfs_get_alloc_profile(root, 0);
> - block_rsv->space_info = __find_space_info(fs_info,
> - BTRFS_BLOCK_GROUP_METADATA);
> + block_rsv->space_info = __find_space_info(fs_info, alloc_target);
>
> return block_rsv;
> }
> diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
> index d74e6af..609d67a 100644
> --- a/fs/btrfs/extent_io.c
> +++ b/fs/btrfs/extent_io.c
> @@ -2823,6 +2823,8 @@ int extent_prepare_write(struct extent_io_tree *tree,
> NULL, 1,
> end_bio_extent_preparewrite, 0,
> 0, 0);
> + if (ret && !err)
> + err = ret;
> iocount++;
> block_start = block_start + iosize;
> } else {
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index c038644..1dc5b96 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -1372,7 +1372,7 @@ int btrfs_merge_bio_hook(struct page *page, unsigned
> long offset,
>
> if (map_length < length + size)
> return 1;
> - return 0;
> + return ret;
> }
>
> /*
> @@ -2672,8 +2672,8 @@ static int check_path_shared(struct btrfs_root *root,
> {
> struct extent_buffer *eb;
> int level;
> - int ret;
> u64 refs = 1;
> + int uninitialized_var(ret);
>
> for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
> if (!path->nodes[level])
> @@ -2686,7 +2686,7 @@ static int check_path_shared(struct btrfs_root *root,
> if (refs > 1)
> return 1;
> }
> - return 0;
> + return ret; /* XXX callers? */
> }
>
> /*
> diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
> index b37d723..5f225fe 100644
> --- a/fs/btrfs/relocation.c
> +++ b/fs/btrfs/relocation.c
> @@ -3099,6 +3099,8 @@ static int add_tree_block(struct reloc_control *rc,
> BUG_ON(item_size != sizeof(struct btrfs_extent_item_v0));
> ret = get_ref_objectid_v0(rc, path, extent_key,
> &ref_owner, NULL);
> + if (ret < 0)
> + return ret;
> BUG_ON(ref_owner >= BTRFS_MAX_LEVEL);
> level = (int)ref_owner;
> /* FIXME: get real generation */
> @@ -4143,7 +4145,7 @@ int btrfs_reloc_clone_csums(struct inode *inode, u64
> file_pos, u64 len)
> btrfs_add_ordered_sum(inode, ordered, sums);
> }
> btrfs_put_ordered_extent(ordered);
> - return 0;
> + return ret;
> }
>
> void btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
> diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
> index fb102a9..224fb5b 100644
> --- a/fs/btrfs/tree-log.c
> +++ b/fs/btrfs/tree-log.c
> @@ -2273,7 +2273,7 @@ fail:
> }
> btrfs_end_log_trans(root);
>
> - return 0;
> + return err;
> }
>
> /* see comments for btrfs_del_dir_entries_in_log */
>
>
>
> --
> Itaru Kitayama <kitay...@cl.bb4.ne.jp>
> --
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