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fix for cstyle. #13

Merged
merged 2 commits into from
Apr 6, 2021
Merged

fix for cstyle. #13

merged 2 commits into from
Apr 6, 2021

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lundman
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@lundman lundman commented Mar 25, 2021

Had to guess some things. Move ident in made some places nicer.

Kajerik Lundman and others added 2 commits March 25, 2021 16:14
Had to guess some things. Move ident in made some places nicer.
Thanks for the mindless work
@lundman lundman merged commit 86dd83c into windows Apr 6, 2021
lundman added a commit that referenced this pull request Jul 1, 2021
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
lundman added a commit that referenced this pull request Jul 2, 2021
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
lundman added a commit that referenced this pull request Feb 21, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Jul 30, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Aug 27, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Sep 23, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Sep 23, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Sep 23, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Sep 23, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Sep 23, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Sep 23, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Sep 23, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Sep 23, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Sep 23, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Sep 23, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Sep 23, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Sep 23, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Sep 23, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Oct 1, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Oct 1, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Oct 1, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Oct 1, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Oct 1, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Oct 1, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Oct 1, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Oct 1, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Oct 1, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Oct 1, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Oct 2, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Oct 6, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Oct 6, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Oct 6, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
andrewc12 referenced this pull request in andrewc12/openzfs Oct 9, 2022
This is a large commit, but it should have no functional changes, just cstyle corrections.

* fix for cstyle.

Had to guess some things. Move ident in made some places nicer.

* Correct typos in cstyle

Thanks for the mindless work

Co-authored-by: Kajerik Lundman <kajerik@lundman.net>
lundman pushed a commit that referenced this pull request Mar 3, 2023
Under certain loads, the following panic is hit:

    panic: page fault
    KDB: stack backtrace:
    #0 0xffffffff805db025 at kdb_backtrace+0x65
    #1 0xffffffff8058e86f at vpanic+0x17f
    #2 0xffffffff8058e6e3 at panic+0x43
    #3 0xffffffff808adc15 at trap_fatal+0x385
    #4 0xffffffff808adc6f at trap_pfault+0x4f
    #5 0xffffffff80886da8 at calltrap+0x8
    #6 0xffffffff80669186 at vgonel+0x186
    #7 0xffffffff80669841 at vgone+0x31
    #8 0xffffffff8065806d at vfs_hash_insert+0x26d
    #9 0xffffffff81a39069 at sfs_vgetx+0x149
    #10 0xffffffff81a39c54 at zfsctl_snapdir_lookup+0x1e4
    #11 0xffffffff8065a28c at lookup+0x45c
    #12 0xffffffff806594b9 at namei+0x259
    #13 0xffffffff80676a33 at kern_statat+0xf3
    #14 0xffffffff8067712f at sys_fstatat+0x2f
    #15 0xffffffff808ae50c at amd64_syscall+0x10c
    #16 0xffffffff808876bb at fast_syscall_common+0xf8

The page fault occurs because vgonel() will call VOP_CLOSE() for active
vnodes. For this reason, define vop_close for zfsctl_ops_snapshot. While
here, define vop_open for consistency.

After adding the necessary vop, the bug progresses to the following
panic:

    panic: VERIFY3(vrecycle(vp) == 1) failed (0 == 1)
    cpuid = 17
    KDB: stack backtrace:
    #0 0xffffffff805e29c5 at kdb_backtrace+0x65
    #1 0xffffffff8059620f at vpanic+0x17f
    #2 0xffffffff81a27f4a at spl_panic+0x3a
    #3 0xffffffff81a3a4d0 at zfsctl_snapshot_inactive+0x40
    #4 0xffffffff8066fdee at vinactivef+0xde
    #5 0xffffffff80670b8a at vgonel+0x1ea
    #6 0xffffffff806711e1 at vgone+0x31
    #7 0xffffffff8065fa0d at vfs_hash_insert+0x26d
    #8 0xffffffff81a39069 at sfs_vgetx+0x149
    #9 0xffffffff81a39c54 at zfsctl_snapdir_lookup+0x1e4
    #10 0xffffffff80661c2c at lookup+0x45c
    #11 0xffffffff80660e59 at namei+0x259
    #12 0xffffffff8067e3d3 at kern_statat+0xf3
    #13 0xffffffff8067eacf at sys_fstatat+0x2f
    #14 0xffffffff808b5ecc at amd64_syscall+0x10c
    #15 0xffffffff8088f07b at fast_syscall_common+0xf8

This is caused by a race condition that can occur when allocating a new
vnode and adding that vnode to the vfs hash. If the newly created vnode
loses the race when being inserted into the vfs hash, it will not be
recycled as its usecount is greater than zero, hitting the above
assertion.

Fix this by dropping the assertion.

FreeBSD-issue: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252700
Reviewed-by: Andriy Gapon <avg@FreeBSD.org>
Reviewed-by: Mateusz Guzik <mjguzik@gmail.com>
Reviewed-by: Alek Pinchuk <apinchuk@axcient.com>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Rob Wing <rob.wing@klarasystems.com>
Co-authored-by: Rob Wing <rob.wing@klarasystems.com>
Submitted-by: Klara, Inc.
Sponsored-by: rsync.net
Closes openzfs#14501
lundman pushed a commit that referenced this pull request Mar 3, 2023
Under certain loads, the following panic is hit:

    panic: page fault
    KDB: stack backtrace:
    #0 0xffffffff805db025 at kdb_backtrace+0x65
    #1 0xffffffff8058e86f at vpanic+0x17f
    #2 0xffffffff8058e6e3 at panic+0x43
    #3 0xffffffff808adc15 at trap_fatal+0x385
    #4 0xffffffff808adc6f at trap_pfault+0x4f
    #5 0xffffffff80886da8 at calltrap+0x8
    #6 0xffffffff80669186 at vgonel+0x186
    #7 0xffffffff80669841 at vgone+0x31
    #8 0xffffffff8065806d at vfs_hash_insert+0x26d
    #9 0xffffffff81a39069 at sfs_vgetx+0x149
    #10 0xffffffff81a39c54 at zfsctl_snapdir_lookup+0x1e4
    #11 0xffffffff8065a28c at lookup+0x45c
    #12 0xffffffff806594b9 at namei+0x259
    #13 0xffffffff80676a33 at kern_statat+0xf3
    #14 0xffffffff8067712f at sys_fstatat+0x2f
    #15 0xffffffff808ae50c at amd64_syscall+0x10c
    #16 0xffffffff808876bb at fast_syscall_common+0xf8

The page fault occurs because vgonel() will call VOP_CLOSE() for active
vnodes. For this reason, define vop_close for zfsctl_ops_snapshot. While
here, define vop_open for consistency.

After adding the necessary vop, the bug progresses to the following
panic:

    panic: VERIFY3(vrecycle(vp) == 1) failed (0 == 1)
    cpuid = 17
    KDB: stack backtrace:
    #0 0xffffffff805e29c5 at kdb_backtrace+0x65
    #1 0xffffffff8059620f at vpanic+0x17f
    #2 0xffffffff81a27f4a at spl_panic+0x3a
    #3 0xffffffff81a3a4d0 at zfsctl_snapshot_inactive+0x40
    #4 0xffffffff8066fdee at vinactivef+0xde
    #5 0xffffffff80670b8a at vgonel+0x1ea
    #6 0xffffffff806711e1 at vgone+0x31
    #7 0xffffffff8065fa0d at vfs_hash_insert+0x26d
    #8 0xffffffff81a39069 at sfs_vgetx+0x149
    #9 0xffffffff81a39c54 at zfsctl_snapdir_lookup+0x1e4
    #10 0xffffffff80661c2c at lookup+0x45c
    #11 0xffffffff80660e59 at namei+0x259
    #12 0xffffffff8067e3d3 at kern_statat+0xf3
    #13 0xffffffff8067eacf at sys_fstatat+0x2f
    #14 0xffffffff808b5ecc at amd64_syscall+0x10c
    #15 0xffffffff8088f07b at fast_syscall_common+0xf8

This is caused by a race condition that can occur when allocating a new
vnode and adding that vnode to the vfs hash. If the newly created vnode
loses the race when being inserted into the vfs hash, it will not be
recycled as its usecount is greater than zero, hitting the above
assertion.

Fix this by dropping the assertion.

FreeBSD-issue: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252700
Reviewed-by: Andriy Gapon <avg@FreeBSD.org>
Reviewed-by: Mateusz Guzik <mjguzik@gmail.com>
Reviewed-by: Alek Pinchuk <apinchuk@axcient.com>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Rob Wing <rob.wing@klarasystems.com>
Co-authored-by: Rob Wing <rob.wing@klarasystems.com>
Submitted-by: Klara, Inc.
Sponsored-by: rsync.net
Closes openzfs#14501
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