On Thu, Jun 22, 2017 at 12:08:44PM +0800, Qu Wenruo wrote:
> > On Thu, Jun 22, 2017 at 10:22:57AM +0800, Qu Wenruo wrote:
> > > > gargamel:~# btrfs check -p --mode lowmem /dev/mapper/dshelf2
> > > > Checking filesystem on /dev/mapper/dshelf2
> > > > UUID: 85441c59-ad11-4b25-b1fe-974f9e4acede
> > > > ERROR: extent[3886187384832, 81920] referencer count mismatch (root:
> > > > 11930, owner: 375444, offset: 1851654144) wanted: 1, have: 4
> > >
> > > This means that in extent tree, btrfs says there is only one referring
> > > to this extent, but lowmem mode find 4.
> > >
> > > It would provide great help if you could dump extent tree for it.
> > > # btrfs-debug-tree <dev> | grep -C 10 3886187384832
> > extent data backref root 11712 objectid 375444 offset 1851572224 count 1
> > extent data backref root 11276 objectid 375444 offset 1851572224 count 1
> > extent data backref root 11058 objectid 375444 offset 1851572224 count 1
> > extent data backref root 11494 objectid 375444 offset 1851572224 count 1
> > item 37 key (3886187352064 EXTENT_ITEM 32768) itemoff 11381 itemsize 140
> > extent refs 4 gen 32382 flags DATA
> > extent data backref root 11712 objectid 375444 offset 1851596800 count 1
> > extent data backref root 11276 objectid 375444 offset 1851596800 count 1
> > extent data backref root 11058 objectid 375444 offset 1851596800 count 1
> > extent data backref root 11494 objectid 375444 offset 1851596800 count 1
> > item 38 key (3886187384832 EXTENT_ITEM 81920) itemoff 11212 itemsize 169
> > extent refs 16 gen 32382 flags DATA
> > extent data backref root 11712 objectid 375444 offset 1851654144 count 4
> > extent data backref root 11276 objectid 375444 offset 1851654144 count 4
> > extent data backref root 11058 objectid 375444 offset 1851654144 count 3
> > extent data backref root 11494 objectid 375444 offset 1851654144 count 4
> > extent data backref root 11930 objectid 375444 offset 1851654144 count 1
> > item 39 key (3886187466752 EXTENT_ITEM 16384) itemoff 11043 itemsize 169
> > extent refs 5 gen 32382 flags DATA
> > extent data backref root 11712 objectid 375444 offset 1851744256 count 1
> > extent data backref root 11276 objectid 375444 offset 1851744256 count 1
>
> Well, there is only the output from extent tree.
>
> I was also expecting output from subvolue (11930) tree.
>
> It could be done by
> # btrfs-debug-tree -t 11930 | grep -C 10 3886187384832
>
> But please pay attention that, this dump may contain filenames, feel free to
> mask the filenames.
There you go:
gargamel:~# btrfs-debug-tree /dev/mapper/dsh | grep -C 10 3886187384832
dshelf1@ dshelf2@
extent compression 0 (none)
item 201 key (375444 EXTENT_DATA 1851654144) itemoff 5577 itemsize 53
extent data disk byte 5613689888768 nr 8192
extent data offset 0 nr 8192 ram 8192
extent compression 0 (none)
item 3 key (375444 EXTENT_DATA 1851744256) itemoff 16071 itemsize 53
generation 32382 type 1 (regular)
extent data disk byte 5613689888768 nr 8192
extent data offset 0 nr 8192 ram 8192
extent compression 0 (none)
item 201 key (375444 EXTENT_DATA 1851654144) itemoff 5577 itemsize 53
generation 32961 type 1 (regular)
extent data disk byte 4686293291008 nr 16384
extent data offset 0 nr 16384 ram 16384
extent compression 0 (none)
item 202 key (375444 EXTENT_DATA 1851670528) itemoff 5524 itemsize 53
generation 32382 type 1 (regular)
extent data disk byte 3886187384832 nr 81920
extent data offset 16384 nr 8192 ram 81920
extent compression 0 (none)
item 203 key (375444 EXTENT_DATA 1851678720) itemoff 5471 itemsize 53
generation 33534 type 1 (regular)
extent data disk byte 5540480962560 nr 8192
extent data offset 0 nr 8192 ram 8192
extent compression 0 (none)
item 204 key (375444 EXTENT_DATA 1851686912) itemoff 5418 itemsize 53
generation 32961 type 1 (regular)
extent data disk byte 4686293307392 nr 16384
extent data offset 8192 nr 8192 ram 16384
extent compression 0 (none)
item 205 key (375444 EXTENT_DATA 1851695104) itemoff 5365 itemsize 53
generation 32382 type 1 (regular)
extent data disk byte 3886187384832 nr 81920
extent data offset 40960 nr 8192 ram 81920
extent compression 0 (none)
item 206 key (375444 EXTENT_DATA 1851703296) itemoff 5312 itemsize 53
generation 32961 type 1 (regular)
extent data disk byte 4686293323776 nr 8192
extent data offset 0 nr 8192 ram 8192
extent compression 0 (none)
item 207 key (375444 EXTENT_DATA 1851711488) itemoff 5259 itemsize 53
generation 32382 type 1 (regular)
extent data disk byte 3886187384832 nr 81920
extent data offset 57344 nr 8192 ram 81920
extent compression 0 (none)
leaf 5715801047040 items 105 free space 8093 generation 36595 owner 11930
fs uuid 85441c59-ad11-4b25-b1fe-974f9e4acede
chunk uuid ed705b7b-2fa6-43f6-a4a1-941c8463ee68
item 0 key (375444 EXTENT_DATA 1851719680) itemoff 16230 itemsize 53
generation 34868 type 1 (regular)
extent data disk byte 5591266127872 nr 8192
extent data offset 0 nr 8192 ram 8192
extent compression 0 (none)
item 1 key (375444 EXTENT_DATA 1851727872) itemoff 16177 itemsize 53
generation 32382 type 1 (regular)
extent data disk byte 3886187384832 nr 81920
extent data offset 73728 nr 8192 ram 81920
extent compression 0 (none)
item 2 key (375444 EXTENT_DATA 1851736064) itemoff 16124 itemsize 53
generation 31782 type 1 (regular)
extent data disk byte 5922189430784 nr 106496
extent data offset 81920 nr 8192 ram 106496
extent compression 0 (none)
item 3 key (375444 EXTENT_DATA 1851744256) itemoff 16071 itemsize 53
generation 32382 type 1 (regular)
extent data disk byte 3886187466752 nr 16384
> Thanks for this one.
> And it is caused by inlined compressed extent.
>
> Lu Fengqi will send patch fixing it.
I got the patch and will test it, thank you.
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/ | PGP 1024R/763BE901
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