Re: Ghost directory entries (previously "Unable to remove directory entry")

Filipe Manana
2021-11-19T09:25:39Z

On Fri, Nov 19, 2021 at 3:20 AM Zygo Blaxell
<ce3g8jdj@umail.furryterror.org> wrote:
>
> On Thu, Nov 18, 2021 at 11:04:33PM +0000, Filipe Manana wrote:
> > On Thu, Nov 18, 2021 at 9:47 PM Zygo Blaxell
> > <ce3g8jdj@umail.furryterror.org> wrote:
> > >
> > > There is an old bug where btrfs leaves ghost entries in a btrfs directory
> > > after a crash. Recent instances have been observed on kernel 5.7, 5.10,
> > > and 5.14.
> >
> > I remember looking at and trying to reproduce when you last reported it in 2019.
> > I couldn't reproduce it.
>
> I can't reproduce it either, at least not intentionally. All my
> information about the issue comes from correlating data from crashes in
> the fleet.
>
> Since 2020 the rate of btrfs-related crashes is much lower (good work
> everyone!) so this bug happens less often in the field now, and I get
> proportionally less data about it.
>
> I haven't observed it myself between 2019 and yesterday, but a few people
> on IRC have encountered the issue in between.

I remember fixing some bugs that lead to that type of issue, but it
was really many years ago (4, 5, maybe more).

>
> > > The reproducer is something like:
> > >
> > > while (true) { // pseudocode for your favorite application
> > > int fd = create(tmp_name);
> >
> > Is tmp_name the same in every iteration? Or is it a unique name in
> > each iteration?
>
> In all cases I know of, both names are the same in every iteration,
> e.g. tmp_name = "a.tmp" and regular_name = "a", and the application
> keeps using those two file names over and over.
>
> git follows this pattern for many of its files. In the dump-tree below,
> all of the files are from a .git directory (index, HEAD, CHERRY_PICK_HEAD,
> MERGE_MSG) and the temporary names are typically the regular name with
> ".lock" appended.
>
> > > write(fd, ...);
> > > fsync(fd); // required, bug does not appear without this fsync
> > > close(fd);
> > > rename(tmp_name, regular_name);
> >
> > Here I suppose regular_name is unique in each iteration and that we
> > are renaming within the same directory (and not moving the file into a
> > different directory besides changing its name).
>
> In all cases I know of, the temporary and regular names are in the
> same directory.
>
> I haven't seen any cases where unique names (either temporary or regular)
> trigger the bug.
>
> In .git folders, object and pack files have unique temporary and regular
> names and they are not affected. The bug always affects a branch ref,
> the index, HEAD, one of the commit editor message files, or some other
> file in .git with a constant (non-hash-based) name.
>
> rsync uses a unique temporary name for each new file and does thousands
> of renames in every transfer, but never uses fsync(). Sometimes the
> regular name previously exists and sometimes it does not, but neither
> case produces a broken dirent.
>
> Mail spools use a unique temporary and regular name for every file and
> use fsync() and rename() all day long, but I've never seen the issue
> with this workload (or anything with equivalent filename patterns) either.
>
> > > If the fsync is removed from the application loop, this issue never
> > > occurs. This makes me think the issue is related to log tree, since
> > > log tree is only used when fsync is called[citation needed] and the
> > > bug is totally absent without fsync().
> >
> > Both the fsync and the rename will touch the log tree.
>
> Noted. Maybe the combination of both operations on the same object
> does something wrong?

I just tried that loop using that case, and several variations
(different names, different directories, etc), I still couldn't
reproduce and I don't see how that alone could lead to any issue.

I think there must be something else happening in parallel besides that loop.

Btw, does 'btrfs check' detects and complains about the issue?

>
> > I have been doing recently many changes around that area, renames and
> > directory logging.
> > Are you able to test misc-next? Just to check if such recent changes
> > haven't fixed it by accident.
>
> Sure, I have a VM dedicated to testing misc-next all the time. I only
> have to find a reliable reproducer for this bug to run on it...
>
> > Thanks.
> >
> > >
> > > I have thousands of counterexamples of crashes (the bug has been present
> > > since 2016) while running the above loop without one of fsync() or
> > > rename(), and no ghost dentries occur. Indeed, an effective workaround
> > > for this bug is to always run applications under eatmydata, or remove
> > > fsync() calls and recompile.
> > >
> > > I recently caught this happening on a subvol with 31028760 total directory
> > > entries. After removing every dirent from the subvol that had an inode,
> > > this is what is left over:
> > >
> > > btrfs-progs v5.14
> > > file tree key (166258 ROOT_ITEM 7934444)
> > > leaf 87631174418432 items 189 free space 3852 generation 7937485 owner 166258
> > > leaf 87631174418432 flags 0x1(WRITTEN) backref revision 1
> > > fs uuid 21806bec-39eb-4ef6-8258-fe1c9c9f0310
> > > chunk uuid f5ad05bf-8d8f-42bf-84c1-5935d963b0d3
> > > item 0 key (256 INODE_ITEM 0) itemoff 16123 itemsize 160
> > > generation 8 transid 7937485 size 20 nbytes 0
> > > block group 0 mode 40755 links 1 uid 0 gid 0 rdev 0
> > > sequence 3542067 flags 0x0(none)
> > > atime 1468817719.337826302 (2016-07-18 00:55:19)
> > > ctime 1637267141.710179785 (2021-11-18 15:25:41)
> > > mtime 1637267141.710179785 (2021-11-18 15:25:41)
> > > otime 1440041474.865575922 (2015-08-19 23:31:14)
> > > item 1 key (256 INODE_REF 256) itemoff 16111 itemsize 12
> > > index 0 namelen 2 name: ..
> > > item 2 key (256 DIR_ITEM 1799309257) itemoff 16076 itemsize 35
> > > location key (128860927 INODE_ITEM 0) type DIR
> > > transid 7937485 data_len 0 name_len 5
> > > name: repo2
> > > item 3 key (256 DIR_ITEM 2020586557) itemoff 16041 itemsize 35
> > > location key (128853607 INODE_ITEM 0) type DIR
> > > transid 7937484 data_len 0 name_len 5
> > > name: repo1
> > > item 4 key (256 DIR_INDEX 7) itemoff 16006 itemsize 35
> > > location key (128853607 INODE_ITEM 0) type DIR
> > > transid 7937484 data_len 0 name_len 5
> > > name: repo1
> > > item 5 key (256 DIR_INDEX 8) itemoff 15971 itemsize 35
> > > location key (128860927 INODE_ITEM 0) type DIR
> > > transid 7937485 data_len 0 name_len 5
> > > name: repo2
> > > item 6 key (128853607 INODE_ITEM 0) itemoff 15811 itemsize 160
> > > generation 3919396 transid 7937484 size 8 nbytes 0
> > > block group 0 mode 40755 links 1 uid 1000 gid 1000 rdev 0
> > > sequence 665 flags 0x0(none)
> > > atime 1562006299.87401964 (2019-07-01 14:38:19)
> > > ctime 1637267136.271154989 (2021-11-18 15:25:36)
> > > mtime 1637244363.335357854 (2021-11-18 09:06:03)
> > > otime 1562990419.485827259 (2019-07-13 00:00:19)
> > > item 7 key (128853607 INODE_REF 256) itemoff 15796 itemsize 15
> > > index 7 namelen 5 name: repo1
> > > item 8 key (128853607 DIR_ITEM 1694554592) itemoff 15762 itemsize 34
> > > location key (128853608 INODE_ITEM 0) type DIR
> > > transid 3919396 data_len 0 name_len 4
> > > name: .git
> > > item 9 key (128853607 DIR_INDEX 2) itemoff 15728 itemsize 34
> > > location key (128853608 INODE_ITEM 0) type DIR
> > > transid 3919396 data_len 0 name_len 4
> > > name: .git
> > > item 10 key (128853608 INODE_ITEM 0) itemoff 15568 itemsize 160
> > > generation 3919396 transid 7936933 size 0 nbytes 0
> > > block group 0 mode 40755 links 1 uid 1000 gid 1000 rdev 0
> > > sequence 188698 flags 0x0(none)
> > > atime 1562006299.287401961 (2019-07-01 14:38:19)
> > > ctime 1637247755.848804443 (2021-11-18 10:02:35)
> > > mtime 1637247755.848804443 (2021-11-18 10:02:35)
> > > otime 7953764182178924544.1936025699 (-1358315181-11-18 20:42:24)
> > > item 11 key (128853608 INODE_REF 128853607) itemoff 15554 itemsize 14
> > > index 2 namelen 4 name: .git
> > > item 12 key (128853608 DIR_INDEX 71216) itemoff 15516 itemsize 38
> > > location key (205369010 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 8
> > > name: MERGE_RR
> > > item 13 key (128853608 DIR_INDEX 71224) itemoff 15481 itemsize 35
> > > location key (205369050 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
> > > item 14 key (128853608 DIR_INDEX 71226) itemoff 15447 itemsize 34
> > > location key (205369080 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 4
> > > name: HEAD
> > > item 15 key (128853608 DIR_INDEX 71234) itemoff 15412 itemsize 35
> > > location key (205369091 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
> > > item 16 key (128853608 DIR_INDEX 71241) itemoff 15378 itemsize 34
> > > location key (205369100 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 4
> > > name: HEAD
> > > item 17 key (128853608 DIR_INDEX 71247) itemoff 15343 itemsize 35
> > > location key (205369109 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
> > > item 18 key (128853608 DIR_INDEX 71249) itemoff 15304 itemsize 39
> > > location key (205369114 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 9
> > > name: MERGE_MSG
> > > item 19 key (128853608 DIR_INDEX 71251) itemoff 15258 itemsize 46
> > > location key (205369115 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 16
> > > name: CHERRY_PICK_HEAD
> > > item 20 key (128853608 DIR_INDEX 71254) itemoff 15224 itemsize 34
> > > location key (205369121 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 4
> > > name: HEAD
> > > item 21 key (128853608 DIR_INDEX 71260) itemoff 15189 itemsize 35
> > > location key (205369129 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
> > > item 22 key (128853608 DIR_INDEX 71262) itemoff 15150 itemsize 39
> > > location key (205369131 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 9
> > > name: MERGE_MSG
> > > item 23 key (128853608 DIR_INDEX 71264) itemoff 15104 itemsize 46
> > > location key (205369132 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 16
> > > name: CHERRY_PICK_HEAD
> > > item 24 key (128853608 DIR_INDEX 71267) itemoff 15070 itemsize 34
> > > location key (205369136 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 4
> > > name: HEAD
> > > item 25 key (128853608 DIR_INDEX 71273) itemoff 15035 itemsize 35
> > > location key (205369144 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
> > > item 26 key (128853608 DIR_INDEX 71275) itemoff 14996 itemsize 39
> > > location key (205369146 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 9
> > > name: MERGE_MSG
> > > item 27 key (128853608 DIR_INDEX 71277) itemoff 14950 itemsize 46
> > > location key (205369147 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 16
> > > name: CHERRY_PICK_HEAD
> > > item 28 key (128853608 DIR_INDEX 71280) itemoff 14916 itemsize 34
> > > location key (205369152 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 4
> > > name: HEAD
> > > item 29 key (128853608 DIR_INDEX 71286) itemoff 14881 itemsize 35
> > > location key (205369160 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
> > > item 30 key (128853608 DIR_INDEX 71288) itemoff 14842 itemsize 39
> > > location key (205369162 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 9
> > > name: MERGE_MSG
> > > item 31 key (128853608 DIR_INDEX 71290) itemoff 14796 itemsize 46
> > > location key (205369163 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 16
> > > name: CHERRY_PICK_HEAD
> > > item 32 key (128853608 DIR_INDEX 71293) itemoff 14762 itemsize 34
> > > location key (205369167 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 4
> > > name: HEAD
> > > item 33 key (128853608 DIR_INDEX 71299) itemoff 14727 itemsize 35
> > > location key (205369175 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
> > > item 34 key (128853608 DIR_INDEX 71301) itemoff 14688 itemsize 39
> > > location key (205369178 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 9
> > > name: MERGE_MSG
> > > item 35 key (128853608 DIR_INDEX 71303) itemoff 14642 itemsize 46
> > > location key (205369179 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 16
> > > name: CHERRY_PICK_HEAD
> > > item 36 key (128853608 DIR_INDEX 71306) itemoff 14608 itemsize 34
> > > location key (205369184 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 4
> > > name: HEAD
> > > item 37 key (128853608 DIR_INDEX 71312) itemoff 14573 itemsize 35
> > > location key (205369192 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
> > > item 38 key (128853608 DIR_INDEX 71314) itemoff 14534 itemsize 39
> > > location key (205369197 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 9
> > > name: MERGE_MSG
> > > item 39 key (128853608 DIR_INDEX 71316) itemoff 14488 itemsize 46
> > > location key (205369198 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 16
> > > name: CHERRY_PICK_HEAD
> > > item 40 key (128853608 DIR_INDEX 71319) itemoff 14454 itemsize 34
> > > location key (205369202 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 4
> > > name: HEAD
> > > item 41 key (128853608 DIR_INDEX 71325) itemoff 14419 itemsize 35
> > > location key (205369210 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
> > > item 42 key (128853608 DIR_INDEX 71327) itemoff 14380 itemsize 39
> > > location key (205369212 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 9
> > > name: MERGE_MSG
> > > item 43 key (128853608 DIR_INDEX 71329) itemoff 14334 itemsize 46
> > > location key (205369213 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 16
> > > name: CHERRY_PICK_HEAD
> > > item 44 key (128853608 DIR_INDEX 71332) itemoff 14300 itemsize 34
> > > location key (205369218 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 4
> > > name: HEAD
> > > item 45 key (128853608 DIR_INDEX 71338) itemoff 14265 itemsize 35
> > > location key (205369226 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
> > > item 46 key (128853608 DIR_INDEX 71340) itemoff 14226 itemsize 39
> > > location key (205369228 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 9
> > > name: MERGE_MSG
> > > item 47 key (128853608 DIR_INDEX 71342) itemoff 14180 itemsize 46
> > > location key (205369229 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 16
> > > name: CHERRY_PICK_HEAD
> > > item 48 key (128853608 DIR_INDEX 71345) itemoff 14146 itemsize 34
> > > location key (205369233 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 4
> > > name: HEAD
> > > item 49 key (128853608 DIR_INDEX 71351) itemoff 14111 itemsize 35
> > > location key (205369241 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
> > > item 50 key (128853608 DIR_INDEX 71353) itemoff 14072 itemsize 39
> > > location key (205369245 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 9
> > > name: MERGE_MSG
> > > item 51 key (128853608 DIR_INDEX 71355) itemoff 14026 itemsize 46
> > > location key (205369246 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 16
> > > name: CHERRY_PICK_HEAD
> > > item 52 key (128853608 DIR_INDEX 71358) itemoff 13992 itemsize 34
> > > location key (205369251 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 4
> > > name: HEAD
> > > item 53 key (128853608 DIR_INDEX 71364) itemoff 13957 itemsize 35
> > > location key (205369259 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
> > > item 54 key (128853608 DIR_INDEX 71366) itemoff 13918 itemsize 39
> > > location key (205369261 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 9
> > > name: MERGE_MSG
> > > item 55 key (128853608 DIR_INDEX 71368) itemoff 13872 itemsize 46
> > > location key (205369262 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 16
> > > name: CHERRY_PICK_HEAD
> > > item 56 key (128853608 DIR_INDEX 71371) itemoff 13838 itemsize 34
> > > location key (205369267 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 4
> > > name: HEAD
> > > item 57 key (128853608 DIR_INDEX 71377) itemoff 13803 itemsize 35
> > > location key (205369275 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
> > > item 58 key (128853608 DIR_INDEX 71379) itemoff 13764 itemsize 39
> > > location key (205369277 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 9
> > > name: MERGE_MSG
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> > > location key (205369278 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 16
> > > name: CHERRY_PICK_HEAD
> > > item 60 key (128853608 DIR_INDEX 71384) itemoff 13684 itemsize 34
> > > location key (205369282 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 4
> > > name: HEAD
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> > > location key (205369290 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
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> > > location key (205369292 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 9
> > > name: MERGE_MSG
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> > > location key (205369293 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 16
> > > name: CHERRY_PICK_HEAD
> > > item 64 key (128853608 DIR_INDEX 71397) itemoff 13530 itemsize 34
> > > location key (205369297 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 4
> > > name: HEAD
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> > > location key (205369305 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
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> > > location key (205369307 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 9
> > > name: MERGE_MSG
> > > item 67 key (128853608 DIR_INDEX 71407) itemoff 13410 itemsize 46
> > > location key (205369308 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 16
> > > name: CHERRY_PICK_HEAD
> > > item 68 key (128853608 DIR_INDEX 71410) itemoff 13376 itemsize 34
> > > location key (205369312 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 4
> > > name: HEAD
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> > > location key (205369320 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
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> > > location key (205369322 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 9
> > > name: MERGE_MSG
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> > > location key (205369323 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 16
> > > name: CHERRY_PICK_HEAD
> > > item 72 key (128853608 DIR_INDEX 71423) itemoff 13222 itemsize 34
> > > location key (205369328 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 4
> > > name: HEAD
> > > item 73 key (128853608 DIR_INDEX 71429) itemoff 13187 itemsize 35
> > > location key (205369336 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
> > > item 74 key (128853608 DIR_INDEX 71431) itemoff 13148 itemsize 39
> > > location key (205369340 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 9
> > > name: MERGE_MSG
> > > item 75 key (128853608 DIR_INDEX 71433) itemoff 13102 itemsize 46
> > > location key (205369341 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 16
> > > name: CHERRY_PICK_HEAD
> > > item 76 key (128853608 DIR_INDEX 71436) itemoff 13068 itemsize 34
> > > location key (205369345 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 4
> > > name: HEAD
> > > item 77 key (128853608 DIR_INDEX 71442) itemoff 13033 itemsize 35
> > > location key (205369353 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
> > > item 78 key (128853608 DIR_INDEX 71444) itemoff 12994 itemsize 39
> > > location key (205369355 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 9
> > > name: MERGE_MSG
> > > item 79 key (128853608 DIR_INDEX 71446) itemoff 12948 itemsize 46
> > > location key (205369356 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 16
> > > name: CHERRY_PICK_HEAD
> > > item 80 key (128853608 DIR_INDEX 71449) itemoff 12914 itemsize 34
> > > location key (205369361 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 4
> > > name: HEAD
> > > item 81 key (128853608 DIR_INDEX 71455) itemoff 12879 itemsize 35
> > > location key (205369369 INODE_ITEM 0) type FILE
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> > > name: .git
> > > item 185 key (128860927 DIR_INDEX 3) itemoff 8786 itemsize 34
> > > location key (128860929 INODE_ITEM 0) type DIR
> > > transid 3919396 data_len 0 name_len 4
> > > name: .git
> > > item 186 key (128860929 INODE_ITEM 0) itemoff 8626 itemsize 160
> > > generation 3919396 transid 7936933 size 0 nbytes 0
> > > block group 0 mode 40775 links 1 uid 1000 gid 1000 rdev 0
> > > sequence 120062 flags 0x0(none)
> > > atime 1562006335.966401468 (2019-07-01 14:38:55)
> > > ctime 1637247766.285851455 (2021-11-18 10:02:46)
> > > mtime 1637247766.285851455 (2021-11-18 10:02:46)
> > > otime 7953764182178924544.1936025699 (-1358315181-11-18 20:42:24)
> > > item 187 key (128860929 INODE_REF 128860927) itemoff 8612 itemsize 14
> > > index 3 namelen 4 name: .git
> > > item 188 key (128860929 DIR_INDEX 47625) itemoff 8577 itemsize 35
> > > location key (205369883 INODE_ITEM 0) type FILE
> > > transid 7934032 data_len 0 name_len 5
> > > name: index
> > > total bytes 45641256394752
> > > bytes used 22206031355904
> > > uuid 21806bec-39eb-4ef6-8258-fe1c9c9f0310
> > >
> > > To 'find' it looks like this (note the duplicated directory entries):
> > >
> > > .
> > > ./repo1
> > > ./repo1/.git
> > > ./repo1/.git/MERGE_RR
> > > ./repo1/.git/index
> > > ./repo1/.git/HEAD
> > > ./repo1/.git/index
> > > ./repo1/.git/HEAD
> > > ./repo1/.git/index
> > > ./repo1/.git/MERGE_MSG
> > > [...]
> > > ./repo1/.git/MERGE_MSG
> > > ./repo1/.git/CHERRY_PICK_HEAD
> > > ./repo1/.git/HEAD
> > > ./repo1/.git/index
> > > ./repo1/.git/MERGE_MSG
> > > ./repo1/.git/CHERRY_PICK_HEAD
> > > ./repo1/.git/HEAD
> > > ./repo1/.git/index
> > > ./repo1/.git/MERGE_MSG
> > > ./repo1/.git/CHERRY_PICK_HEAD
> > > ./repo1/.git/HEAD
> > > ./repo2
> > > ./repo2/.git
> > > ./repo2/.git/index
> > >
> > > 'find -ls' can't stat any of the directory entries because there are no
> > > inodes behind them:
> > >
> > > 256 0 drwxr-xr-x 1 root root 20 Nov 18 15:25 .
> > > 128853607 0 drwxr-xr-x 1 zblaxell zblaxell 8 Nov 18 09:06 ./repo1
> > > 128853608 0 drwxr-xr-x 1 zblaxell zblaxell 0 Nov 18 10:02 ./repo1/.git
> > > find: ‘./repo1/.git/MERGE_RR’: No such file or directory
> > > find: ‘./repo1/.git/index’: No such file or directory
> > > find: ‘./repo1/.git/HEAD’: No such file or directory
> > > find: ‘./repo1/.git/index’: No such file or directory
> > > find: ‘./repo1/.git/HEAD’: No such file or directory
> > > find: ‘./repo1/.git/index’: No such file or directory
> > > find: ‘./repo1/.git/MERGE_MSG’: No such file or directory
> > > [...]
> > > find: ‘./repo1/.git/CHERRY_PICK_HEAD’: No such file or directory
> > > find: ‘./repo1/.git/index’: No such file or directory
> > > find: ‘./repo1/.git/MERGE_MSG’: No such file or directory
> > > find: ‘./repo1/.git/CHERRY_PICK_HEAD’: No such file or directory
> > > find: ‘./repo1/.git/HEAD’: No such file or directory
> > > find: ‘./repo1/.git/index’: No such file or directory
> > > find: ‘./repo1/.git/MERGE_MSG’: No such file or directory
> > > find: ‘./repo1/.git/CHERRY_PICK_HEAD’: No such file or directory
> > > find: ‘./repo1/.git/HEAD’: No such file or directory
> > > 128860927 0 drwxrwxr-x 1 zblaxell zblaxell 8 Nov 18 10:02 ./repo2
> > > 128860929 0 drwxrwxr-x 1 zblaxell zblaxell 0 Nov 18 10:02 ./repo2/.git
> > > find: ‘./repo2/.git/index’: No such file or directory
> > >
> > > Overall it's a mostly-harmless bug. rmdir can remove a directory that
> > > contains only DIR_INDEX items, so I can do something like this to clean
> > > up the mess without having to resort to btrfs check --repair:
> > >
> > > cp -a --reflink dir dir.new
> > > mv dir dir.old
> > > mv dir.new dir
> > > rm -fr dir.old
> > >
> > > Previously:
> > >
> > > https://lore.kernel.org/linux-btrfs/20191209001721.GF22121@hungrycats.org/
> >
> >
> >
> > --
> > Filipe David Manana,
> >
> > “Whether you think you can, or you think you can't — you're right.”
> >

--
Filipe David Manana,

“Whether you think you can, or you think you can't — you're right.”