illumos/illumos-gate@ade42b557aade42b557ahttps://www.illumos.org/issues/8064
It's currently nearly impossible to trace what process places a hold on
a vnode, as the only ways holds are place is via the `VN_HOLD()` and
`VN_HOLD_CALLER()` macros, which inline the bumping of `v_count`. Adding
static DTrace probes to these macros would enable tracing of where
specific vnode references come from.
For completeness and symmetry, a similar static probe should be added to
`vn_rele()` and `vn_rele_dnlc()`.
Reviewed by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed by: Prakash Surya <prakash.surya@delphix.com>
Reviewed by: Prashanth Sreenivasa <pks@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Author: Sebastien Roy <seb@delphix.com>
illumos/illumos-gate@54207fd2e154207fd2e1https://www.illumos.org/issues/4242
From Joyent's OS-2557:
So we're basically just doing a check here that after we got a 'rename' event
for our file, the file has actually been moved out of the way.
What I've seen in bh1-stage2 is that this happens as you'd expect for all zones
but many times over the last week it's failed because when we do the fs.exists
() check here, the file that we got the rename event for, still exists.
I've confirmed what's happening using the following dtrace script:
#!/usr/sbin/dtrace -s
#pragma D option quiet
#pragma D option bufsize=256k
syscall::open:entry,
syscall::open64:entry
/copyinstr(arg0) == "/var/svc/provisioning" || (strlen(copyinstr(arg0)) == 69
&& substr(copyinstr(arg0), 48) == "/var/svc/provisioning")/
{
this->watching_open = 1;
printf("%d zone %s process %s(%d) [%s] open(%s)\\n",
timestamp,
zonename,
execname,
pid,
curpsinfo->pr_psargs,
copyinstr(arg0));
}
syscall::open:return,
syscall::open64:return
/this->watching_open == 1/
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Marcel Telka <marcel@telka.sk>
Approved by: Dan McDonald <danmcd@omniti.com>
Author: Jerry Jelinek <jerry.jelinek@joyent.com>
