Hi Joseph,
On Fri, Sep 22, 2023 at 5:27 PM Joseph Fernandes <josephaug26@xxxxxxxxx> wrote:
>
> Hello All,
>
> I found a weird issue with ceph_readdirplus_r() when used along
> with ceph_ll_lookup_vino().
> On ceph version 17.2.5 (98318ae89f1a893a6ded3a640405cdbb33e08757) quincy
> (stable)
>
> Any help is really appreciated.
>
> Thanks in advance,
> -Joe
>
> Test Scenario :
>
> A. Create a Ceph Fs Subvolume "4" and created a directory in root of
> subvolume "user_root"
>
> root@ss-joe-01(bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23#
> ceph fs subvolume ls cephfs
> [
> {
> "name": "4"
> }
> ]
> root@ss-joe-01
> (bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23#
>
>
> root@ss-joe-01(bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23#
> ls -l
> total 0
> drwxrwxrwx 2 root root 0 Sep 22 09:16 user_root
> root@ss-joe-01
> (bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23#
>
>
> B. In the "user_root" directory create some files and directories
>
> root@ss-joe-01(bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/user_root#
> mkdir dir1 dir2
> root@ss-joe-01(bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/user_root#
> ls
> dir1 dir2
> root@ss-joe-01(bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/user_root#
> echo
> "Hello Worldls!" > file1
> root@ss-joe-01(bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/user_root#
> echo "Hello Worldls!" > file2
> root@ss-joe-01(bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/user_root#
> ls
> dir1 dir2 file1 file2
> root@ss-joe-01(bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/user_root#
> cat file*
> Hello Worldls!
> Hello Worldls!
>
>
> C. Create a subvolume snapshot "sofs-4-5". Please ignore the older
> snapshots.
>
> root@ss-joe-01(bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23#
> ceph fs subvolume snapshot ls cephfs 4
> [
> {
> "name": "sofs-4-1"
> },
> {
> "name": "sofs-4-2"
> },
> {
> "name": "sofs-4-3"
> },
> {
> "name": "sofs-4-4"
> },
> {
> "name": "sofs-4-5"
> }
> ]
> root@ss-joe-01
> (bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23#
>
> Here "sofs-4-5" has snapshot id 6.
> Got this from libcephfs and have verified at Line
> snapshot_inode_lookup.cpp#L212. (Attached to the email)
>
>
> #Content within the snapshot
>
> root@ss-joe-01(bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23#
> cd .snap/
> root@ss-joe-01(bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/.snap#
> ls
> _sofs-4-1_1099511627778 _sofs-4-2_1099511627778 _sofs-4-3_1099511627778
> _sofs-4-4_1099511627778 _sofs-4-5_1099511627778
> root@ss-joe-01(bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/.snap#
> cd _sofs-4-5_1099511627778/
> root@ss-joe-01(bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/.snap/_sofs-4-5_1099511627778#
> ls
> user_root
> root@ss-joe-01(bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/.snap/_sofs-4-5_1099511627778#
> cd user_root/
> root@ss-joe-01(bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/.snap/_sofs-4-5_1099511627778/user_root#
> ls
> dir1 dir2 file1 file2
> root@ss-joe-01(bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/.snap/_sofs-4-5_1099511627778/user_root#
> cat file*
> Hello Worldls!
> Hello Worldls!
> root@ss-joe-01
> (bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/.snap/_sofs-4-5_1099511627778/user_root#
>
>
> D. Delete all the files and directories in "user_root"
>
> root@ss-joe-01(bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/user_root#
> rm -rf *
> root@ss-joe-01(bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/user_root#
> ls
> root@ss-joe-01
> (bash):/mnt/cephfs/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/user_root#
>
>
> E. Using Libcephfs in a C++ program do the following,(Attached to this
> email)
>
> 1. Get the Inode of "user_root" using ceph_ll_walk().
> 2. Open the directory using Inode received from ceph_ll_walk() and do
> ceph_readdirplus_r()
> We don't see any dentries(except "." and "..") as we have deleted all
> files and directories in the active filesystem. This is expected and
> correct!
>
>
>
> =================================/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/user_root/=====================================
>
> Path/Name
> :"/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/user_root/"
> Inode Address : 0x7f5ce0009900
> Inode Number : 1099511629282
> Snapshot Number : 18446744073709551614
> Inode Number : 1099511629282
> Snapshot Number : 18446744073709551614
> . Ino: 1099511629282 SnapId: 18446744073709551614 Address: 0x7f5ce0009900
> .. Ino: 1099511627779 SnapId: 18446744073709551614 Address:
> 0x7f5ce00090f0
>
>
> 3. Using ceph_ll_lookup_vino() get the Inode * of "user_root" for
> snapshot 6, Here "sofs-4-5" has snapshot id 6.
Try this for path "/volumes/_nogroup/4/" (snapshots live a level-up in
the subvolume path) for the ceph version you use.
> Got this from libcephfs and have verified at Line
> snapshot_inode_lookup.cpp#L212. (Attached to the email
> 4. Open the directory using Inode * received from ceph_ll_lookup_vino()
> and do ceph_readdirplus_r()
> We don't see any dentries (except "." and "..") This is NOT expected and
> NOT correct, as there are files and directories in the snaphot 6.
>
>
> =================================1099511629282:6=====================================
>
> Path/Name :"1099511629282:6"
> Inode Address : 0x7f5ce000a110
> Inode Number : 1099511629282
> Snapshot Number : 6
> Inode Number : 1099511629282
> Snapshot Number : 6
> . Ino: 1099511629282 SnapId: 6 Address: 0x7f5ce000a110
> .. Ino: 1099511629282 SnapId: 6 Address: 0x7f5ce000a110
>
>
> 5. Get the Inode of "user_root/ .snap/_sofs-4-5_1099511627778 / " using
> ceph_ll_walk().
> 6. Open the directory using Inode received from ceph_ll_walk() and do
> ceph_readdirplus_r()
> We see ALL dentries of all files and directories in the snapshot. This
> is expected and correct!
>
>
> =================================/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/user_root/.snap/_sofs-4-5_1099511627778/=====================================
>
> Path/Name
> :"/volumes/_nogroup/4/f0fae76f-196d-4ebd-b8d0-528985505b23/user_root/.snap/_sofs-4-5_1099511627778/"
> Inode Address : 0x7f5ce000a110
> Inode Number : 1099511629282
> Snapshot Number : 6
> Inode Number : 1099511629282
> Snapshot Number : 6
> . Ino: 1099511629282 SnapId: 6 Address: 0x7f5ce000a110
> .. Ino: 1099511629282 SnapId: 18446744073709551615 Address:
> 0x5630ab946340
> file1 Ino: 1099511628291 SnapId: 6 Address: 0x7f5ce000aa90
> dir1 Ino: 1099511628289 SnapId: 6 Address: 0x7f5ce000b180
> dir2 Ino: 1099511628290 SnapId: 6 Address: 0x7f5ce000b800
> file2 Ino: 1099511628292 SnapId: 6 Address: 0x7f5ce000be80
>
> 7. Now Again using ceph_ll_lookup_vino() get the Inode * of "user_root"
> for snapshot 6, Here "sofs-4-5" has snapshot id 6.
> 8. Open the directory using Inode * received from
> ceph_ll_lookup_vino() and do ceph_readdirplus_r()
> Now! we see all the files and Directories in the snapshot!
>
>
> =================================1099511629282:6=====================================
>
> Path/Name :"1099511629282:6"
> Inode Address : 0x7f5ce000a110
> Inode Number : 1099511629282
> Snapshot Number : 6
> Inode Number : 1099511629282
> Snapshot Number : 6
> . Ino: 1099511629282 SnapId: 6 Address: 0x7f5ce000a110
> .. Ino: 1099511629282 SnapId: 18446744073709551615 Address:
> 0x5630ab946340
> file1 Ino: 1099511628291 SnapId: 6 Address: 0x7f5ce000aa90
> dir1 Ino: 1099511628289 SnapId: 6 Address: 0x7f5ce000b180
> dir2 Ino: 1099511628290 SnapId: 6 Address: 0x7f5ce000b800
> file2 Ino: 1099511628292 SnapId: 6 Address: 0x7f5ce000be80
>
>
> Am I missing something using these APIs?
>
> File attached to this email
> Full out of the program attached to the email.
> - snapshot_inode_lookup.cpp_output.txt <Attached>
> C++ Program - snapshot_inode_lookup.cpp <Attached>
> /etc/ceph/ceph.conf - <attached>
> Ceph Client Log during the run of this C++ program - client.log<attached>
>
> Compile Command:
> g++ -o snapshot_inode_lookup ./snapshot_inode_lookup.cpp -g -ldl -ldw
> -lcephfs -lboost_filesystem --std=c++17
>
> Linux Details,
> root@ss-joe-01(bash):/home/hydrauser# uname -a
> Linux ss-joe-01 5.10.0-23-amd64 #1 SMP Debian 5.10.179-1 (2023-05-12)
> x86_64 GNU/Linux
> root@ss-joe-01(bash):/home/hydrauser#
>
> Ceph Details,
>
> root@ss-joe-01(bash):/home/hydrauser# ceph -v
> ceph version 17.2.5 (98318ae89f1a893a6ded3a640405cdbb33e08757) quincy
> (stable)
> root@ss-joe-01(bash):/home/hydrauser#
> root@ss-joe-01(bash):/home/hydrauser# ceph -s
> cluster:
> id: fb43d857-d165-4189-87fc-cf1debce9170
> health: HEALTH_OK
>
> services:
> mon: 3 daemons, quorum ss-joe-01,ss-joe-02,ss-joe-03 (age 4d)
> mgr: ss-joe-01(active, since 4d), standbys: ss-joe-03, ss-joe-02
> mds: 1/1 daemons up
> osd: 3 osds: 3 up (since 4d), 3 in (since 4d)
>
> data:
> volumes: 1/1 healthy
> pools: 3 pools, 49 pgs
> objects: 39 objects, 1.0 MiB
> usage: 96 MiB used, 30 GiB / 30 GiB avail
> pgs: 49 active+clean
>
> root@ss-joe-01(bash):/home/hydrauser#
> root@ss-joe-01(bash):/home/hydrauser# dpkg -l | grep ceph
> ii ceph 17.2.5-1~bpo11+1
> amd64 distributed storage and file system
> ii ceph-base 17.2.5-1~bpo11+1
> amd64 common ceph daemon libraries and management tools
> ii ceph-base-dbg 17.2.5-1~bpo11+1
> amd64 debugging symbols for ceph-base
> ii ceph-common 17.2.5-1~bpo11+1
> amd64 common utilities to mount and interact with a ceph
> storage cluster
> ii ceph-common-dbg 17.2.5-1~bpo11+1
> amd64 debugging symbols for ceph-common
> ii ceph-fuse 17.2.5-1~bpo11+1
> amd64 FUSE-based client for the Ceph distributed file
> system
> ii ceph-fuse-dbg 17.2.5-1~bpo11+1
> amd64 debugging symbols for ceph-fuse
> ii ceph-mds 17.2.5-1~bpo11+1
> amd64 metadata server for the ceph distributed file system
> ii ceph-mds-dbg 17.2.5-1~bpo11+1
> amd64 debugging symbols for ceph-mds
> ii ceph-mgr 17.2.5-1~bpo11+1
> amd64 manager for the ceph distributed storage system
> ii ceph-mgr-cephadm 17.2.5-1~bpo11+1
> all cephadm orchestrator module for ceph-mgr
> ii ceph-mgr-dashboard 17.2.5-1~bpo11+1
> all dashboard module for ceph-mgr
> ii ceph-mgr-dbg 17.2.5-1~bpo11+1
> amd64 debugging symbols for ceph-mgr
> ii ceph-mgr-diskprediction-local 17.2.5-1~bpo11+1
> all diskprediction-local module for ceph-mgr
> ii ceph-mgr-k8sevents 17.2.5-1~bpo11+1
> all kubernetes events module for ceph-mgr
> ii ceph-mgr-modules-core 17.2.5-1~bpo11+1
> all ceph manager modules which are always enabled
> ii ceph-mon 17.2.5-1~bpo11+1
> amd64 monitor server for the ceph storage system
> ii ceph-mon-dbg 17.2.5-1~bpo11+1
> amd64 debugging symbols for ceph-mon
> ii ceph-osd 17.2.5-1~bpo11+1
> amd64 OSD server for the ceph storage system
> ii ceph-osd-dbg 17.2.5-1~bpo11+1
> amd64 debugging symbols for ceph-osd
> ii ceph-volume 17.2.5-1~bpo11+1
> all tool to facilidate OSD deployment
> ii cephadm 17.2.5-1~bpo11+1
> amd64 cephadm utility to bootstrap ceph daemons with
> systemd and containers
> ii libcephfs2 17.2.5-1~bpo11+1
> amd64 Ceph distributed file system client library
> ii libcephfs2-dbg 17.2.5-1~bpo11+1
> amd64 debugging symbols for libcephfs2
> ii libsqlite3-mod-ceph 17.2.5-1~bpo11+1
> amd64 SQLite3 VFS for Ceph
> ii libsqlite3-mod-ceph-dbg 17.2.5-1~bpo11+1
> amd64 debugging symbols for libsqlite3-mod-ceph
> ii python3-ceph-argparse 17.2.5-1~bpo11+1
> all Python 3 utility libraries for Ceph CLI
> ii python3-ceph-common 17.2.5-1~bpo11+1
> all Python 3 utility libraries for Ceph
> ii python3-cephfs 17.2.5-1~bpo11+1
> amd64 Python 3 libraries for the Ceph libcephfs library
> ii python3-cephfs-dbg 17.2.5-1~bpo11+1
> amd64 Python 3 libraries for the Ceph libcephfs library
> root@ss-joe-01(bash):/home/hydrauser#
> _______________________________________________
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> To unsubscribe send an email to ceph-users-leave@xxxxxxx
--
Cheers,
Venky
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