CVS commit: [netbsd-10] src/sys/kern

["Martin Husemann" <martin%netbsd.org@localhost>]

Module Name:    src
Committed By:   martin
Date:           Mon Aug 17 15:49:23 UTC 2026

Modified Files:
        src/sys/kern [netbsd-10]: vfs_subr.c

Log Message:
Pull up following revision(s) (requested by riastradh in ticket #1325):

        sys/kern/vfs_subr.c: revision 1.504

vflushbuf: Print `vflushbuf: dirty' warning only once per call.

And do it only under DEBUG, and rate-limit it globally.

This can happen when vflushbuf is competing with an onslaught of
concurrent I/O on a snapshot or block device (which is done without
holding the vnode lock, despite what the comment says).  That
concurrent I/O might be happening indefinitely, so we are likely to
have to print a _lot_ of warnings, potentially overwhelming the
console, until the underlying problem is fixed by teaching vflushbuf
to wait only for the writes that began before have completed, not
also all writes that have begun since.

This stop-gap measure intended to be low-risk for pullup to release
branches.

PR kern/60531: looping "vflushbuf: dirty" message


To generate a diff of this commit:
cvs rdiff -u -r1.496.2.1 -r1.496.2.2 src/sys/kern/vfs_subr.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.