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Make root mount wait mechanism smarter, by making it wait only if the root

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device doesn't yet exist.

Reviewed by:	kib@, marcel@
MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D3709
This commit is contained in:
Edward Tomasz Napierala 2015-10-30 15:35:04 +00:00
parent 52d7c63839
commit a3ba3d09c2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=290196
1 changed files with 50 additions and 17 deletions
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67
sys/kern/vfs_mountroot.c
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@ -88,6 +88,7 @@ __FBSDID("$FreeBSD$");
static int parse_mount(char **);
static struct mntarg *parse_mountroot_options(struct mntarg *, const char *);
static int vfs_mountroot_wait_if_neccessary(const char *fs, const char *dev);
/*
* The vnode of the system's root (/ in the filesystem, without chroot
@ -673,7 +674,7 @@ parse_mount(char **conf)
char *errmsg;
struct mntarg *ma;
char *dev, *fs, *opts, *tok;
int delay, error, timeout;
int error;
error = parse_token(conf, &tok);
if (error)
@ -710,20 +711,9 @@ parse_mount(char **conf)
goto out;
}
if (strcmp(fs, "zfs") != 0 && strstr(fs, "nfs") == NULL &&
dev[0] != '\0' && !parse_mount_dev_present(dev)) {
printf("mountroot: waiting for device %s ...\n", dev);
delay = hz / 10;
timeout = root_mount_timeout * hz;
do {
pause("rmdev", delay);
timeout -= delay;
} while (timeout > 0 && !parse_mount_dev_present(dev));
if (timeout <= 0) {
error = ENODEV;
goto out;
}
}
error = vfs_mountroot_wait_if_neccessary(fs, dev);
if (error != 0)
goto out;
ma = NULL;
ma = mount_arg(ma, "fstype", fs, -1);
@ -931,6 +921,51 @@ vfs_mountroot_wait(void)
}
}
static int
vfs_mountroot_wait_if_neccessary(const char *fs, const char *dev)
{
int delay, timeout;
/*
* In case of ZFS and NFS we don't have a way to wait for
* specific device.
*/
if (strcmp(fs, "zfs") == 0 || strstr(fs, "nfs") != NULL ||
dev[0] == '\0') {
vfs_mountroot_wait();
return (0);
}
/*
* Otherwise, no point in waiting if the device is already there.
* Note that we must wait for GEOM to finish reconfiguring itself,
* eg for geom_part(4) to finish tasting.
*/
DROP_GIANT();
g_waitidle();
PICKUP_GIANT();
if (parse_mount_dev_present(dev))
return (0);
/*
* No luck. Let's wait. This code looks weird, but it's that way
* to behave exactly as it used to work before.
*/
vfs_mountroot_wait();
printf("mountroot: waiting for device %s...\n", dev);
delay = hz / 10;
timeout = root_mount_timeout * hz;
do {
pause("rmdev", delay);
timeout -= delay;
} while (timeout > 0 && !parse_mount_dev_present(dev));
if (timeout <= 0)
return (ENODEV);
return (0);
}
void
vfs_mountroot(void)
{
@ -942,8 +977,6 @@ vfs_mountroot(void)
td = curthread;
vfs_mountroot_wait();
sb = sbuf_new_auto();
vfs_mountroot_conf0(sb);
sbuf_finish(sb);