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[DNM] quincy: client, mds: update mtime and change attr for snapdir when snaps are created, deleted and renamed #50730

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[DNM] quincy: client, mds: update mtime and change attr for snapdir when snaps are created, deleted and renamed #50730

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vshankar
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https://tracker.ceph.com/issues/59041

@lxbsz This will conflict with https://tracker.ceph.com/issues/58825 when its backported - Let's merge your backport first.

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@vshankar vshankar added the cephfs Ceph File System label Mar 29, 2023
@vshankar vshankar requested a review from a team March 29, 2023 06:05
@github-actions github-actions bot added this to the quincy milestone Mar 29, 2023
@vshankar vshankar changed the title quincy: client, mds: update mtime and change attr for snapdir when snaps are created, deleted and renamed [DNM] quincy: client, mds: update mtime and change attr for snapdir when snaps are created, deleted and renamed Mar 30, 2023
@vshankar vshankar added the DNM label Mar 30, 2023
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github-actions bot commented Jun 8, 2023

This pull request can no longer be automatically merged: a rebase is needed and changes have to be manually resolved

@vshankar
mds: track last modification time and change attr for a snap realm no…
123880e 
…de (srnode)

Signed-off-by: Venky Shankar <vshankar@redhat.com>
(cherry picked from commit a119f23)
@vshankar
mds: initialize last_modified to current timestamp for root inode sna…
fea896a 
…prealm

Signed-off-by: Venky Shankar <vshankar@redhat.com>
(cherry picked from commit 77f7b21)
@vshankar
mds: use change_attr from closest ancestor when initializing a new sn…
36672e9 
…aprealm

Signed-off-by: Venky Shankar <vshankar@redhat.com>
(cherry picked from commit f3c0d3b)
@vshankar
mds: include last modification time and change attr of a snap realm n…
2916e07 
…ode in snap trace reply

To handle older clients, introduce a cephfs feature bit. The MDS encodes a "new"
SNapRealmInfo structure for clients supporting this feature (which includes the
last modification timestamp and a version/change_attr for the snap realm). For
clients not advertising this feature, the MDS uses the existing SnapRealmInfo
structure for snapshot traces.

Signed-off-by: Venky Shankar <vshankar@redhat.com>
(cherry picked from commit 7a4c509)
@vshankar
mds: update last modification time and change attr for a snap realm node
80ae6a9 
Signed-off-by: Venky Shankar <vshankar@redhat.com>
(cherry picked from commit cdf4ae4)
@vshankar
client: update {m,c}time and change attr for snapdir from last modifi…
889d34a 
…cation time of a snap realm

For MDS that do not encode the "new" SnapReamInfo strucutre, fallback to
using SnapRealmInfo.

Signed-off-by: Venky Shankar <vshankar@redhat.com>
(cherry picked from commit af4739b)
@vshankar
test: add test to validate attrs for snapdir after snap operations
c5331a1 
Fixes: http://tracker.ceph.com/issues/54501
Signed-off-by: Venky Shankar <vshankar@redhat.com>
(cherry picked from commit f1f6da1)
@vshankar vshankar changed the title [DNM] quincy: client, mds: update mtime and change attr for snapdir when snaps are created, deleted and renamed quincy: client, mds: update mtime and change attr for snapdir when snaps are created, deleted and renamed Jun 21, 2023
@vshankar
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@yuriw please include this change in your next quincy test run.

ljflores
ljflores reviewed Jul 12, 2023
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src/client/Client.cc
return std::make_pair(ninfo.info, SnapRealmInfoMeta(ninfo.last_modified, ninfo.change_attr));
} else {
SnapRealmInfo info;
decode(info, p);
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@ljflores ljflores Jul 12, 2023 •
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@vshankar looks like the coredump is an issue with this line (see frame 15):

(gdb) bt
#0  __GI___pthread_once (once_control=0x7fbc6f8f2088 <once>, init_routine=0x7fbc6f669f10 <__option_is_end>) at pthread_once.c:139
#1  0x00007fbc6f66a074 in init () at backtrace.c:61
#2  0x0000557275a2af32 in ceph::ClibBackTrace::ClibBackTrace (s=1, this=0x7fbc2c1f5d80) at /usr/src/debug/ceph-17.2.6-785.g0040a8bd.el8.x86_64/src/common/BackTrace.h:44
#3  handle_oneshot_fatal_signal (signum=6) at /usr/src/debug/ceph-17.2.6-785.g0040a8bd.el8.x86_64/src/global/signal_handler.cc:325
#4  <signal handler called>
#5  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#6  0x00007fbc6f550ea5 in __GI_abort () at abort.c:79
#7  0x00007fbc6ff1e09b in __gnu_cxx::__verbose_terminate_handler() [clone .cold.1] () from /lib64/libstdc++.so.6
#8  0x00007fbc6ff2453c in std::rethrow_exception(std::__exception_ptr::exception_ptr) () from /lib64/libstdc++.so.6
#9  0x00007fbc6ff247f8 in __cxa_throw () from /lib64/libstdc++.so.6
#10 0x00007fbc71cc3e95 in ceph::buffer::v15_2_0::list::iterator_impl<true>::copy (this=this@entry=0x7fbc2c1f9ee0, len=26, len@entry=48, dest=0x7fbc2c1f9d66 "", dest@entry=0x7fbc2c1f9d50 "")
    at /usr/src/debug/ceph-17.2.6-785.g0040a8bd.el8.x86_64/src/common/buffer.cc:752
#11 0x00007fbc71aac811 in ceph::decode_raw<ceph_mds_snap_realm> (p=..., t=...) at /usr/src/debug/ceph-17.2.6-785.g0040a8bd.el8.x86_64/src/include/encoding.h:77
#12 decode (p=..., v=...) at /usr/src/debug/ceph-17.2.6-785.g0040a8bd.el8.x86_64/src/include/types.h:333
#13 SnapRealmInfo::decode (this=this@entry=0x7fbc2c1f9d50, bl=...) at /usr/src/debug/ceph-17.2.6-785.g0040a8bd.el8.x86_64/src/common/snap_types.cc:20
#14 0x00007fbc5fb80e7e in decode (p=..., c=...) at /usr/src/debug/ceph-17.2.6-785.g0040a8bd.el8.x86_64/src/common/snap_types.h:41
#15 get_snap_realm_info (session=<optimized out>, p=...) at /usr/src/debug/ceph-17.2.6-785.g0040a8bd.el8.x86_64/src/client/Client.cc:5038
#16 0x00007fbc5fbd7f11 in Client::update_snap_trace (this=0x55727caa4000, session=0x55727b74cc60, bl=..., realm_ret=0x0, flush=true) at /usr/src/debug/ceph-17.2.6-785.g0040a8bd.el8.x86_64/src/client/Client.cc:5053
#17 0x00007fbc5fbd8dd8 in Client::handle_snap (this=0x55727caa4000, m=...) at /opt/rh/gcc-toolset-11/root/usr/include/c++/11/bits/shared_ptr_base.h:1295
#18 0x00007fbc5fc0ab45 in Client::ms_dispatch2 (this=0x55727caa4000, m=...) at /usr/src/debug/ceph-17.2.6-785.g0040a8bd.el8.x86_64/x86_64-redhat-linux-gnu/boost/include/boost/smart_ptr/intrusive_ptr.hpp:131
#19 0x00007fbc71b6ee78 in Messenger::ms_deliver_dispatch (this=0x55727ca70900, m=...) at /usr/src/debug/ceph-17.2.6-785.g0040a8bd.el8.x86_64/src/msg/Messenger.h:720
#20 0x00007fbc71b6c2bf in DispatchQueue::entry (this=0x55727ca70c80) at /usr/src/debug/ceph-17.2.6-785.g0040a8bd.el8.x86_64/src/msg/DispatchQueue.cc:201
#21 0x00007fbc71c36131 in DispatchQueue::DispatchThread::entry (this=<optimized out>) at /usr/src/debug/ceph-17.2.6-785.g0040a8bd.el8.x86_64/src/msg/DispatchQueue.h:101
#22 0x00007fbc70b1a1ca in start_thread (arg=<optimized out>) at pthread_create.c:479
#23 0x00007fbc6f568e73 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

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@vshankar looks like the coredump is an issue with this line (see frame 15):

OK. That could be buggy. But why were the core files getting shown as ceph-mgr?

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The coredump showed up as mgr because the crash occurred when a command was issued on the ceph-mgr binary. So, it turned out not to be a problem with the mgr, but I needed the ceph-mgr binary to decode the coredump.

@vshankar vshankar added the DNM label Jul 13, 2023
@vshankar vshankar changed the title quincy: client, mds: update mtime and change attr for snapdir when snaps are created, deleted and renamed [DNM] quincy: client, mds: update mtime and change attr for snapdir when snaps are created, deleted and renamed Jul 13, 2023
@yuriw yuriw removed the needs-qa label Jul 27, 2023
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