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Differential D43816

VFS: update VOP_FSYNC() debug check to reflect actual locking policy
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Authored by jah on Feb 10 2024, 4:35 PM.
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kib
markj
olce
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rGd0bb255d1fcb: VFS: update VOP_FSYNC() debug check to reflect actual locking policy
rG9530182e371d: VFS: update VOP_FSYNC() debug check to reflect actual locking policy
Summary

Shared vs. exclusive locking is determined not by MNT_EXTENDED_SHARED
but by MNT_SHARED_WRITES (although there are several places that
ignore this and simply always use an exclusive lock). Also add a
comment on the possible difference between VOP_GETWRITEMOUNT(vp)
and vp->v_mount on this path.

Found by local testing of unionfs atop ZFS with DEBUG_VFS_LOCKS.

MFC after: 2 weeks

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rG FreeBSD src repository
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kern/
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sys/kern/vfs_subr.c

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