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zed additional features

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This commit adds two features to zed, that macOS desires. The first
is that when you unload the kernel module, zed would enter into a
cpubusy loop calling zfs_events_next() repeatedly. We now look for
ENODEV, returned by kernel, so zed can exit gracefully.

Second feature is -I (idle) (alas -P persist was taken) is for the
deamon to;

1; if started without ZFS kernel module, stick around waiting for it.
2; if kernel module is unloaded, go back to 1.

This is due to daemons in macOS is started by launchctl, and is
expected to stick around.

Currently, the busy loop only exists when errno is ENODEV. This is
to ensure that functionality that upstream expects is not changed.
It did not care about errors before, and it still does not. (with the
exception of ENODEV).

However, it is probably better that all errors
(ERESTART notwithstanding) exits the loop, and the issues complaining
about zed taking all CPU will go away.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Jorgen Lundman <lundman@lundman.net>
Closes #10476
This commit is contained in:
Jorgen Lundman
2020-06-23 01:53:34 +09:00
committed by GitHub
parent 42d8d1d66a
commit 68301ba20e
6 changed files with 62 additions and 12 deletions
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cmd/zed/zed.c
+27 -2
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@@ -263,18 +263,43 @@ main(int argc, char *argv[])
if (zed_conf_read_state(zcp, &saved_eid, saved_etime) < 0)
exit(EXIT_FAILURE);
zed_event_init(zcp);
idle:
/*
* If -I is specified, attempt to open /dev/zfs repeatedly until
* successful.
*/
do {
if (!zed_event_init(zcp))
break;
/* Wait for some time and try again. tunable? */
sleep(30);
} while (!_got_exit && zcp->do_idle);
if (_got_exit)
goto out;
zed_event_seek(zcp, saved_eid, saved_etime);
while (!_got_exit) {
int rv;
if (_got_hup) {
_got_hup = 0;
(void) zed_conf_scan_dir(zcp);
}
zed_event_service(zcp);
rv = zed_event_service(zcp);
/* ENODEV: When kernel module is unloaded (osx) */
if (rv == ENODEV)
break;
}
zed_log_msg(LOG_NOTICE, "Exiting");
zed_event_fini(zcp);
if (zcp->do_idle && !_got_exit)
goto idle;
out:
zed_conf_destroy(zcp);
zed_log_fini();
exit(EXIT_SUCCESS);