Split the root mount logic from the (generic) mount code and move
it (the root mount code) into a new file called vfs_mountroot.c The split is almost trivial, as the code is almost perfectly non-intertwined. The only adjustment needed was to move the UMA zone allocation out of vfs_mountroot() [in vfs_mountroot.c] and into vfs_mount.c, where it had to be done as a SYSINIT [see vfs_mount_init()]. There are no functional changes with this commit.
This commit is contained in:
parent
de1add1e45
commit
24e01f5998
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=213365
@ -2264,6 +2264,7 @@ kern/vfs_hash.c standard
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kern/vfs_init.c standard
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kern/vfs_lookup.c standard
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kern/vfs_mount.c standard
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kern/vfs_mountroot.c standard
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kern/vfs_subr.c standard
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kern/vfs_syscalls.c standard
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kern/vfs_vnops.c standard
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@ -67,16 +67,10 @@ __FBSDID("$FreeBSD$");
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#include <security/audit/audit.h>
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#include <security/mac/mac_framework.h>
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#include "opt_rootdevname.h"
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#define ROOTNAME "root_device"
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#define VFS_MOUNTARG_SIZE_MAX (1024 * 64)
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static void set_rootvnode(void);
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static int vfs_domount(struct thread *td, const char *fstype,
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char *fspath, int fsflags, void *fsdata);
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static int vfs_mountroot_ask(void);
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static int vfs_mountroot_try(const char *mountfrom, const char *options);
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static void free_mntarg(struct mntarg *ma);
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static int usermount = 0;
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@ -94,31 +88,6 @@ struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist);
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struct mtx mountlist_mtx;
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MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF);
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/*
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* The vnode of the system's root (/ in the filesystem, without chroot
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* active.)
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*/
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struct vnode *rootvnode;
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/*
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* The root filesystem is detailed in the kernel environment variable
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* vfs.root.mountfrom, which is expected to be in the general format
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*
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* <vfsname>:[<path>][ <vfsname>:[<path>] ...]
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* vfsname := the name of a VFS known to the kernel and capable
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* of being mounted as root
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* path := disk device name or other data used by the filesystem
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* to locate its physical store
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*
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* If the environment variable vfs.root.mountfrom is a space separated list,
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* each list element is tried in turn and the root filesystem will be mounted
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* from the first one that suceeds.
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*
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* The environment variable vfs.root.mountfrom.options is a comma delimited
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* set of string mount options. These mount options must be parseable
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* by nmount() in the kernel.
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*/
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/*
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* Global opts, taken by all filesystems
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*/
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@ -133,21 +102,35 @@ static const char *global_opts[] = {
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NULL
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};
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/*
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* The root specifiers we will try if RB_CDROM is specified.
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*/
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static char *cdrom_rootdevnames[] = {
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"cd9660:cd0",
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"cd9660:acd0",
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NULL
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};
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static int
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mount_init(void *mem, int size, int flags)
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{
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struct mount *mp;
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/* legacy find-root code */
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char *rootdevnames[2] = {NULL, NULL};
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#ifndef ROOTDEVNAME
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# define ROOTDEVNAME NULL
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#endif
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static const char *ctrootdevname = ROOTDEVNAME;
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mp = (struct mount *)mem;
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mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF);
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lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0);
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return (0);
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}
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static void
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mount_fini(void *mem, int size)
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{
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struct mount *mp;
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mp = (struct mount *)mem;
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lockdestroy(&mp->mnt_explock);
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mtx_destroy(&mp->mnt_mtx);
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}
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static void
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vfs_mount_init(void *dummy __unused)
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{
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mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL,
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NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
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}
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SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL);
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/*
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* ---------------------------------------------------------------------
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@ -452,27 +435,6 @@ vfs_rel(struct mount *mp)
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MNT_IUNLOCK(mp);
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}
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static int
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mount_init(void *mem, int size, int flags)
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{
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struct mount *mp;
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mp = (struct mount *)mem;
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mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF);
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lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0);
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return (0);
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}
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static void
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mount_fini(void *mem, int size)
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{
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struct mount *mp;
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mp = (struct mount *)mem;
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lockdestroy(&mp->mnt_explock);
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mtx_destroy(&mp->mnt_mtx);
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}
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/*
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* Allocate and initialize the mount point struct.
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*/
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@ -1383,281 +1345,6 @@ dounmount(mp, flags, td)
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return (0);
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}
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/*
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* ---------------------------------------------------------------------
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* Mounting of root filesystem
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*
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*/
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struct root_hold_token {
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const char *who;
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LIST_ENTRY(root_hold_token) list;
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};
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static LIST_HEAD(, root_hold_token) root_holds =
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LIST_HEAD_INITIALIZER(root_holds);
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static int root_mount_complete;
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/*
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* Hold root mount.
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*/
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struct root_hold_token *
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root_mount_hold(const char *identifier)
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{
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struct root_hold_token *h;
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if (root_mounted())
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return (NULL);
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h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK);
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h->who = identifier;
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mtx_lock(&mountlist_mtx);
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LIST_INSERT_HEAD(&root_holds, h, list);
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mtx_unlock(&mountlist_mtx);
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return (h);
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}
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/*
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* Release root mount.
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*/
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void
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root_mount_rel(struct root_hold_token *h)
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{
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if (h == NULL)
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return;
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mtx_lock(&mountlist_mtx);
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LIST_REMOVE(h, list);
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wakeup(&root_holds);
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mtx_unlock(&mountlist_mtx);
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free(h, M_DEVBUF);
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}
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/*
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* Wait for all subsystems to release root mount.
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*/
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static void
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root_mount_prepare(void)
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{
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struct root_hold_token *h;
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struct timeval lastfail;
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int curfail = 0;
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for (;;) {
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DROP_GIANT();
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g_waitidle();
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PICKUP_GIANT();
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mtx_lock(&mountlist_mtx);
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if (LIST_EMPTY(&root_holds)) {
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mtx_unlock(&mountlist_mtx);
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break;
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}
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if (ppsratecheck(&lastfail, &curfail, 1)) {
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printf("Root mount waiting for:");
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LIST_FOREACH(h, &root_holds, list)
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printf(" %s", h->who);
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printf("\n");
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}
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msleep(&root_holds, &mountlist_mtx, PZERO | PDROP, "roothold",
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hz);
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}
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}
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/*
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* Root was mounted, share the good news.
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*/
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static void
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root_mount_done(void)
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{
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/* Keep prison0's root in sync with the global rootvnode. */
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mtx_lock(&prison0.pr_mtx);
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prison0.pr_root = rootvnode;
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vref(prison0.pr_root);
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mtx_unlock(&prison0.pr_mtx);
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/*
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* Use a mutex to prevent the wakeup being missed and waiting for
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* an extra 1 second sleep.
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*/
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mtx_lock(&mountlist_mtx);
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root_mount_complete = 1;
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wakeup(&root_mount_complete);
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mtx_unlock(&mountlist_mtx);
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}
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/*
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* Return true if root is already mounted.
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*/
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int
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root_mounted(void)
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{
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/* No mutex is acquired here because int stores are atomic. */
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return (root_mount_complete);
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}
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/*
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* Wait until root is mounted.
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*/
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void
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root_mount_wait(void)
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{
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/*
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* Panic on an obvious deadlock - the function can't be called from
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* a thread which is doing the whole SYSINIT stuff.
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*/
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KASSERT(curthread->td_proc->p_pid != 0,
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("root_mount_wait: cannot be called from the swapper thread"));
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mtx_lock(&mountlist_mtx);
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while (!root_mount_complete) {
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msleep(&root_mount_complete, &mountlist_mtx, PZERO, "rootwait",
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hz);
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}
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mtx_unlock(&mountlist_mtx);
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}
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static void
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set_rootvnode()
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{
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struct proc *p;
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if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode))
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panic("Cannot find root vnode");
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VOP_UNLOCK(rootvnode, 0);
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p = curthread->td_proc;
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FILEDESC_XLOCK(p->p_fd);
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if (p->p_fd->fd_cdir != NULL)
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vrele(p->p_fd->fd_cdir);
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p->p_fd->fd_cdir = rootvnode;
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VREF(rootvnode);
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if (p->p_fd->fd_rdir != NULL)
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vrele(p->p_fd->fd_rdir);
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p->p_fd->fd_rdir = rootvnode;
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VREF(rootvnode);
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FILEDESC_XUNLOCK(p->p_fd);
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EVENTHANDLER_INVOKE(mountroot);
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}
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/*
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* Mount /devfs as our root filesystem, but do not put it on the mountlist
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* yet. Create a /dev -> / symlink so that absolute pathnames will lookup.
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*/
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static void
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devfs_first(void)
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{
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struct thread *td = curthread;
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struct vfsoptlist *opts;
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struct vfsconf *vfsp;
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struct mount *mp = NULL;
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int error;
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vfsp = vfs_byname("devfs");
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KASSERT(vfsp != NULL, ("Could not find devfs by name"));
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if (vfsp == NULL)
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return;
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mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred);
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error = VFS_MOUNT(mp);
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KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error));
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if (error)
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return;
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opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
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TAILQ_INIT(opts);
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mp->mnt_opt = opts;
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mtx_lock(&mountlist_mtx);
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TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list);
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mtx_unlock(&mountlist_mtx);
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set_rootvnode();
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error = kern_symlink(td, "/", "dev", UIO_SYSSPACE);
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if (error)
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printf("kern_symlink /dev -> / returns %d\n", error);
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}
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/*
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* Surgically move our devfs to be mounted on /dev.
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*/
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static void
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devfs_fixup(struct thread *td)
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{
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struct nameidata nd;
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struct vnode *vp, *dvp;
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struct mount *mp;
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int error;
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/* Remove our devfs mount from the mountlist and purge the cache */
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mtx_lock(&mountlist_mtx);
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mp = TAILQ_FIRST(&mountlist);
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TAILQ_REMOVE(&mountlist, mp, mnt_list);
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mtx_unlock(&mountlist_mtx);
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cache_purgevfs(mp);
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VFS_ROOT(mp, LK_EXCLUSIVE, &dvp);
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VI_LOCK(dvp);
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dvp->v_iflag &= ~VI_MOUNT;
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VI_UNLOCK(dvp);
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dvp->v_mountedhere = NULL;
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/* Set up the real rootvnode, and purge the cache */
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TAILQ_FIRST(&mountlist)->mnt_vnodecovered = NULL;
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set_rootvnode();
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cache_purgevfs(rootvnode->v_mount);
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NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td);
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error = namei(&nd);
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if (error) {
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printf("Lookup of /dev for devfs, error: %d\n", error);
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vput(dvp);
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vfs_unbusy(mp);
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return;
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}
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NDFREE(&nd, NDF_ONLY_PNBUF);
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vp = nd.ni_vp;
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if (vp->v_type != VDIR) {
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printf("/dev is not a directory\n");
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vput(dvp);
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vput(vp);
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vfs_unbusy(mp);
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return;
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}
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error = vinvalbuf(vp, V_SAVE, 0, 0);
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if (error) {
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printf("vinvalbuf() of /dev failed, error: %d\n", error);
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vput(dvp);
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vput(vp);
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vfs_unbusy(mp);
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return;
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}
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cache_purge(vp);
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mp->mnt_vnodecovered = vp;
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vp->v_mountedhere = mp;
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mtx_lock(&mountlist_mtx);
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TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
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mtx_unlock(&mountlist_mtx);
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VOP_UNLOCK(vp, 0);
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vput(dvp);
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vfs_unbusy(mp);
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/* Unlink the no longer needed /dev/dev -> / symlink */
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error = kern_unlink(td, "/dev/dev", UIO_SYSSPACE);
|
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if (error)
|
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printf("kern_unlink of /dev/dev failed, error: %d\n", error);
|
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}
|
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|
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/*
|
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* Report errors during filesystem mounting.
|
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*/
|
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@ -1694,288 +1381,6 @@ vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...)
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va_end(ap);
|
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}
|
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|
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/*
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* Find and mount the root filesystem
|
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*/
|
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void
|
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vfs_mountroot(void)
|
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{
|
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char *cp, *cpt, *options, *tmpdev;
|
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int error, i, asked = 0;
|
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|
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options = NULL;
|
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|
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root_mount_prepare();
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mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount),
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NULL, NULL, mount_init, mount_fini,
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UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
|
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devfs_first();
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|
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/*
|
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* We are booted with instructions to prompt for the root filesystem.
|
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*/
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if (boothowto & RB_ASKNAME) {
|
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if (!vfs_mountroot_ask())
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goto mounted;
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asked = 1;
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}
|
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|
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options = getenv("vfs.root.mountfrom.options");
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|
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/*
|
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* The root filesystem information is compiled in, and we are
|
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* booted with instructions to use it.
|
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*/
|
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if (ctrootdevname != NULL && (boothowto & RB_DFLTROOT)) {
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if (!vfs_mountroot_try(ctrootdevname, options))
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goto mounted;
|
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ctrootdevname = NULL;
|
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}
|
||||
|
||||
/*
|
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* We've been given the generic "use CDROM as root" flag. This is
|
||||
* necessary because one media may be used in many different
|
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* devices, so we need to search for them.
|
||||
*/
|
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if (boothowto & RB_CDROM) {
|
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for (i = 0; cdrom_rootdevnames[i] != NULL; i++) {
|
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if (!vfs_mountroot_try(cdrom_rootdevnames[i], options))
|
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goto mounted;
|
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}
|
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}
|
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|
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/*
|
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* Try to use the value read by the loader from /etc/fstab, or
|
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* supplied via some other means. This is the preferred
|
||||
* mechanism.
|
||||
*/
|
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cp = getenv("vfs.root.mountfrom");
|
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if (cp != NULL) {
|
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cpt = cp;
|
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while ((tmpdev = strsep(&cpt, " \t")) != NULL) {
|
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error = vfs_mountroot_try(tmpdev, options);
|
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if (error == 0) {
|
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freeenv(cp);
|
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goto mounted;
|
||||
}
|
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}
|
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freeenv(cp);
|
||||
}
|
||||
|
||||
/*
|
||||
* Try values that may have been computed by code during boot
|
||||
*/
|
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if (!vfs_mountroot_try(rootdevnames[0], options))
|
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goto mounted;
|
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if (!vfs_mountroot_try(rootdevnames[1], options))
|
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goto mounted;
|
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|
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/*
|
||||
* If we (still) have a compiled-in default, try it.
|
||||
*/
|
||||
if (ctrootdevname != NULL)
|
||||
if (!vfs_mountroot_try(ctrootdevname, options))
|
||||
goto mounted;
|
||||
/*
|
||||
* Everything so far has failed, prompt on the console if we haven't
|
||||
* already tried that.
|
||||
*/
|
||||
if (!asked)
|
||||
if (!vfs_mountroot_ask())
|
||||
goto mounted;
|
||||
|
||||
panic("Root mount failed, startup aborted.");
|
||||
|
||||
mounted:
|
||||
root_mount_done();
|
||||
freeenv(options);
|
||||
}
|
||||
|
||||
static struct mntarg *
|
||||
parse_mountroot_options(struct mntarg *ma, const char *options)
|
||||
{
|
||||
char *p;
|
||||
char *name, *name_arg;
|
||||
char *val, *val_arg;
|
||||
char *opts;
|
||||
|
||||
if (options == NULL || options[0] == '\0')
|
||||
return (ma);
|
||||
|
||||
p = opts = strdup(options, M_MOUNT);
|
||||
if (opts == NULL) {
|
||||
return (ma);
|
||||
}
|
||||
|
||||
while((name = strsep(&p, ",")) != NULL) {
|
||||
if (name[0] == '\0')
|
||||
break;
|
||||
|
||||
val = strchr(name, '=');
|
||||
if (val != NULL) {
|
||||
*val = '\0';
|
||||
++val;
|
||||
}
|
||||
if( strcmp(name, "rw") == 0 ||
|
||||
strcmp(name, "noro") == 0) {
|
||||
/*
|
||||
* The first time we mount the root file system,
|
||||
* we need to mount 'ro', so We need to ignore
|
||||
* 'rw' and 'noro' mount options.
|
||||
*/
|
||||
continue;
|
||||
}
|
||||
name_arg = strdup(name, M_MOUNT);
|
||||
val_arg = NULL;
|
||||
if (val != NULL)
|
||||
val_arg = strdup(val, M_MOUNT);
|
||||
|
||||
ma = mount_arg(ma, name_arg, val_arg,
|
||||
(val_arg != NULL ? -1 : 0));
|
||||
}
|
||||
free(opts, M_MOUNT);
|
||||
return (ma);
|
||||
}
|
||||
|
||||
/*
|
||||
* Mount (mountfrom) as the root filesystem.
|
||||
*/
|
||||
static int
|
||||
vfs_mountroot_try(const char *mountfrom, const char *options)
|
||||
{
|
||||
struct mount *mp;
|
||||
struct mntarg *ma;
|
||||
char *vfsname, *path;
|
||||
time_t timebase;
|
||||
int error;
|
||||
char patt[32];
|
||||
char errmsg[255];
|
||||
|
||||
vfsname = NULL;
|
||||
path = NULL;
|
||||
mp = NULL;
|
||||
ma = NULL;
|
||||
error = EINVAL;
|
||||
bzero(errmsg, sizeof(errmsg));
|
||||
|
||||
if (mountfrom == NULL)
|
||||
return (error); /* don't complain */
|
||||
printf("Trying to mount root from %s\n", mountfrom);
|
||||
|
||||
/* parse vfs name and path */
|
||||
vfsname = malloc(MFSNAMELEN, M_MOUNT, M_WAITOK);
|
||||
path = malloc(MNAMELEN, M_MOUNT, M_WAITOK);
|
||||
vfsname[0] = path[0] = 0;
|
||||
sprintf(patt, "%%%d[a-z0-9]:%%%ds", MFSNAMELEN, MNAMELEN);
|
||||
if (sscanf(mountfrom, patt, vfsname, path) < 1)
|
||||
goto out;
|
||||
|
||||
if (path[0] == '\0')
|
||||
strcpy(path, ROOTNAME);
|
||||
|
||||
ma = mount_arg(ma, "fstype", vfsname, -1);
|
||||
ma = mount_arg(ma, "fspath", "/", -1);
|
||||
ma = mount_arg(ma, "from", path, -1);
|
||||
ma = mount_arg(ma, "errmsg", errmsg, sizeof(errmsg));
|
||||
ma = mount_arg(ma, "ro", NULL, 0);
|
||||
ma = parse_mountroot_options(ma, options);
|
||||
error = kernel_mount(ma, MNT_ROOTFS);
|
||||
|
||||
if (error == 0) {
|
||||
/*
|
||||
* We mount devfs prior to mounting the / FS, so the first
|
||||
* entry will typically be devfs.
|
||||
*/
|
||||
mp = TAILQ_FIRST(&mountlist);
|
||||
KASSERT(mp != NULL, ("%s: mountlist is empty", __func__));
|
||||
|
||||
/*
|
||||
* Iterate over all currently mounted file systems and use
|
||||
* the time stamp found to check and/or initialize the RTC.
|
||||
* Typically devfs has no time stamp and the only other FS
|
||||
* is the actual / FS.
|
||||
* Call inittodr() only once and pass it the largest of the
|
||||
* timestamps we encounter.
|
||||
*/
|
||||
timebase = 0;
|
||||
do {
|
||||
if (mp->mnt_time > timebase)
|
||||
timebase = mp->mnt_time;
|
||||
mp = TAILQ_NEXT(mp, mnt_list);
|
||||
} while (mp != NULL);
|
||||
inittodr(timebase);
|
||||
|
||||
devfs_fixup(curthread);
|
||||
}
|
||||
|
||||
if (error != 0 ) {
|
||||
printf("ROOT MOUNT ERROR: %s\n", errmsg);
|
||||
printf("If you have invalid mount options, reboot, and ");
|
||||
printf("first try the following from\n");
|
||||
printf("the loader prompt:\n\n");
|
||||
printf(" set vfs.root.mountfrom.options=rw\n\n");
|
||||
printf("and then remove invalid mount options from ");
|
||||
printf("/etc/fstab.\n\n");
|
||||
}
|
||||
out:
|
||||
free(path, M_MOUNT);
|
||||
free(vfsname, M_MOUNT);
|
||||
return (error);
|
||||
}
|
||||
|
||||
/*
|
||||
* ---------------------------------------------------------------------
|
||||
* Interactive root filesystem selection code.
|
||||
*/
|
||||
|
||||
static int
|
||||
vfs_mountroot_ask(void)
|
||||
{
|
||||
char name[128];
|
||||
char *mountfrom;
|
||||
char *options;
|
||||
|
||||
for(;;) {
|
||||
printf("Loader variables:\n");
|
||||
printf("vfs.root.mountfrom=");
|
||||
mountfrom = getenv("vfs.root.mountfrom");
|
||||
if (mountfrom != NULL) {
|
||||
printf("%s", mountfrom);
|
||||
}
|
||||
printf("\n");
|
||||
printf("vfs.root.mountfrom.options=");
|
||||
options = getenv("vfs.root.mountfrom.options");
|
||||
if (options != NULL) {
|
||||
printf("%s", options);
|
||||
}
|
||||
printf("\n");
|
||||
freeenv(mountfrom);
|
||||
freeenv(options);
|
||||
printf("\nManual root filesystem specification:\n");
|
||||
printf(" <fstype>:<device> Mount <device> using filesystem <fstype>\n");
|
||||
printf(" eg. zfs:tank\n");
|
||||
printf(" eg. ufs:/dev/da0s1a\n");
|
||||
printf(" eg. cd9660:/dev/acd0\n");
|
||||
printf(" This is equivalent to: ");
|
||||
printf("mount -t cd9660 /dev/acd0 /\n");
|
||||
printf("\n");
|
||||
printf(" ? List valid disk boot devices\n");
|
||||
printf(" <empty line> Abort manual input\n");
|
||||
printf("\nmountroot> ");
|
||||
gets(name, sizeof(name), 1);
|
||||
if (name[0] == '\0')
|
||||
return (1);
|
||||
if (name[0] == '?') {
|
||||
printf("\nList of GEOM managed disk devices:\n ");
|
||||
g_dev_print();
|
||||
continue;
|
||||
}
|
||||
if (!vfs_mountroot_try(name, NULL))
|
||||
return (0);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* ---------------------------------------------------------------------
|
||||
* Functions for querying mount options/arguments from filesystems.
|
||||
|
626
sys/kern/vfs_mountroot.c
Normal file
626
sys/kern/vfs_mountroot.c
Normal file
@ -0,0 +1,626 @@
|
||||
/*-
|
||||
* Copyright (c) 1999-2004 Poul-Henning Kamp
|
||||
* Copyright (c) 1999 Michael Smith
|
||||
* Copyright (c) 1989, 1993
|
||||
* The Regents of the University of California. All rights reserved.
|
||||
* (c) UNIX System Laboratories, Inc.
|
||||
* All or some portions of this file are derived from material licensed
|
||||
* to the University of California by American Telephone and Telegraph
|
||||
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
|
||||
* the permission of UNIX System Laboratories, Inc.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 4. Neither the name of the University nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
#include <sys/cdefs.h>
|
||||
__FBSDID("$FreeBSD$");
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/conf.h>
|
||||
#include <sys/fcntl.h>
|
||||
#include <sys/jail.h>
|
||||
#include <sys/kernel.h>
|
||||
#include <sys/libkern.h>
|
||||
#include <sys/malloc.h>
|
||||
#include <sys/mount.h>
|
||||
#include <sys/mutex.h>
|
||||
#include <sys/namei.h>
|
||||
#include <sys/priv.h>
|
||||
#include <sys/proc.h>
|
||||
#include <sys/filedesc.h>
|
||||
#include <sys/reboot.h>
|
||||
#include <sys/syscallsubr.h>
|
||||
#include <sys/sysproto.h>
|
||||
#include <sys/sx.h>
|
||||
#include <sys/sysctl.h>
|
||||
#include <sys/sysent.h>
|
||||
#include <sys/systm.h>
|
||||
#include <sys/vnode.h>
|
||||
#include <vm/uma.h>
|
||||
|
||||
#include <geom/geom.h>
|
||||
|
||||
#include <machine/stdarg.h>
|
||||
|
||||
#include "opt_rootdevname.h"
|
||||
|
||||
#define ROOTNAME "root_device"
|
||||
|
||||
static int vfs_mountroot_ask(void);
|
||||
static int vfs_mountroot_try(const char *mountfrom, const char *options);
|
||||
|
||||
/*
|
||||
* The vnode of the system's root (/ in the filesystem, without chroot
|
||||
* active.)
|
||||
*/
|
||||
struct vnode *rootvnode;
|
||||
|
||||
/*
|
||||
* The root filesystem is detailed in the kernel environment variable
|
||||
* vfs.root.mountfrom, which is expected to be in the general format
|
||||
*
|
||||
* <vfsname>:[<path>][ <vfsname>:[<path>] ...]
|
||||
* vfsname := the name of a VFS known to the kernel and capable
|
||||
* of being mounted as root
|
||||
* path := disk device name or other data used by the filesystem
|
||||
* to locate its physical store
|
||||
*
|
||||
* If the environment variable vfs.root.mountfrom is a space separated list,
|
||||
* each list element is tried in turn and the root filesystem will be mounted
|
||||
* from the first one that suceeds.
|
||||
*
|
||||
* The environment variable vfs.root.mountfrom.options is a comma delimited
|
||||
* set of string mount options. These mount options must be parseable
|
||||
* by nmount() in the kernel.
|
||||
*/
|
||||
|
||||
/*
|
||||
* The root specifiers we will try if RB_CDROM is specified.
|
||||
*/
|
||||
static char *cdrom_rootdevnames[] = {
|
||||
"cd9660:cd0",
|
||||
"cd9660:acd0",
|
||||
NULL
|
||||
};
|
||||
|
||||
/* legacy find-root code */
|
||||
char *rootdevnames[2] = {NULL, NULL};
|
||||
#ifndef ROOTDEVNAME
|
||||
# define ROOTDEVNAME NULL
|
||||
#endif
|
||||
static const char *ctrootdevname = ROOTDEVNAME;
|
||||
|
||||
struct root_hold_token {
|
||||
const char *who;
|
||||
LIST_ENTRY(root_hold_token) list;
|
||||
};
|
||||
|
||||
static LIST_HEAD(, root_hold_token) root_holds =
|
||||
LIST_HEAD_INITIALIZER(root_holds);
|
||||
|
||||
static int root_mount_complete;
|
||||
|
||||
struct root_hold_token *
|
||||
root_mount_hold(const char *identifier)
|
||||
{
|
||||
struct root_hold_token *h;
|
||||
|
||||
if (root_mounted())
|
||||
return (NULL);
|
||||
|
||||
h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK);
|
||||
h->who = identifier;
|
||||
mtx_lock(&mountlist_mtx);
|
||||
LIST_INSERT_HEAD(&root_holds, h, list);
|
||||
mtx_unlock(&mountlist_mtx);
|
||||
return (h);
|
||||
}
|
||||
|
||||
void
|
||||
root_mount_rel(struct root_hold_token *h)
|
||||
{
|
||||
|
||||
if (h == NULL)
|
||||
return;
|
||||
mtx_lock(&mountlist_mtx);
|
||||
LIST_REMOVE(h, list);
|
||||
wakeup(&root_holds);
|
||||
mtx_unlock(&mountlist_mtx);
|
||||
free(h, M_DEVBUF);
|
||||
}
|
||||
|
||||
static void
|
||||
root_mount_prepare(void)
|
||||
{
|
||||
struct root_hold_token *h;
|
||||
struct timeval lastfail;
|
||||
int curfail = 0;
|
||||
|
||||
for (;;) {
|
||||
DROP_GIANT();
|
||||
g_waitidle();
|
||||
PICKUP_GIANT();
|
||||
mtx_lock(&mountlist_mtx);
|
||||
if (LIST_EMPTY(&root_holds)) {
|
||||
mtx_unlock(&mountlist_mtx);
|
||||
break;
|
||||
}
|
||||
if (ppsratecheck(&lastfail, &curfail, 1)) {
|
||||
printf("Root mount waiting for:");
|
||||
LIST_FOREACH(h, &root_holds, list)
|
||||
printf(" %s", h->who);
|
||||
printf("\n");
|
||||
}
|
||||
msleep(&root_holds, &mountlist_mtx, PZERO | PDROP, "roothold",
|
||||
hz);
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
root_mount_done(void)
|
||||
{
|
||||
|
||||
/* Keep prison0's root in sync with the global rootvnode. */
|
||||
mtx_lock(&prison0.pr_mtx);
|
||||
prison0.pr_root = rootvnode;
|
||||
vref(prison0.pr_root);
|
||||
mtx_unlock(&prison0.pr_mtx);
|
||||
/*
|
||||
* Use a mutex to prevent the wakeup being missed and waiting for
|
||||
* an extra 1 second sleep.
|
||||
*/
|
||||
mtx_lock(&mountlist_mtx);
|
||||
root_mount_complete = 1;
|
||||
wakeup(&root_mount_complete);
|
||||
mtx_unlock(&mountlist_mtx);
|
||||
}
|
||||
|
||||
int
|
||||
root_mounted(void)
|
||||
{
|
||||
|
||||
/* No mutex is acquired here because int stores are atomic. */
|
||||
return (root_mount_complete);
|
||||
}
|
||||
|
||||
void
|
||||
root_mount_wait(void)
|
||||
{
|
||||
|
||||
/*
|
||||
* Panic on an obvious deadlock - the function can't be called from
|
||||
* a thread which is doing the whole SYSINIT stuff.
|
||||
*/
|
||||
KASSERT(curthread->td_proc->p_pid != 0,
|
||||
("root_mount_wait: cannot be called from the swapper thread"));
|
||||
mtx_lock(&mountlist_mtx);
|
||||
while (!root_mount_complete) {
|
||||
msleep(&root_mount_complete, &mountlist_mtx, PZERO, "rootwait",
|
||||
hz);
|
||||
}
|
||||
mtx_unlock(&mountlist_mtx);
|
||||
}
|
||||
|
||||
static void
|
||||
set_rootvnode(void)
|
||||
{
|
||||
struct proc *p;
|
||||
|
||||
if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode))
|
||||
panic("Cannot find root vnode");
|
||||
|
||||
VOP_UNLOCK(rootvnode, 0);
|
||||
|
||||
p = curthread->td_proc;
|
||||
FILEDESC_XLOCK(p->p_fd);
|
||||
|
||||
if (p->p_fd->fd_cdir != NULL)
|
||||
vrele(p->p_fd->fd_cdir);
|
||||
p->p_fd->fd_cdir = rootvnode;
|
||||
VREF(rootvnode);
|
||||
|
||||
if (p->p_fd->fd_rdir != NULL)
|
||||
vrele(p->p_fd->fd_rdir);
|
||||
p->p_fd->fd_rdir = rootvnode;
|
||||
VREF(rootvnode);
|
||||
|
||||
FILEDESC_XUNLOCK(p->p_fd);
|
||||
|
||||
EVENTHANDLER_INVOKE(mountroot);
|
||||
}
|
||||
|
||||
static void
|
||||
devfs_first(void)
|
||||
{
|
||||
struct thread *td = curthread;
|
||||
struct vfsoptlist *opts;
|
||||
struct vfsconf *vfsp;
|
||||
struct mount *mp = NULL;
|
||||
int error;
|
||||
|
||||
vfsp = vfs_byname("devfs");
|
||||
KASSERT(vfsp != NULL, ("Could not find devfs by name"));
|
||||
if (vfsp == NULL)
|
||||
return;
|
||||
|
||||
mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred);
|
||||
|
||||
error = VFS_MOUNT(mp);
|
||||
KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error));
|
||||
if (error)
|
||||
return;
|
||||
|
||||
opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
|
||||
TAILQ_INIT(opts);
|
||||
mp->mnt_opt = opts;
|
||||
|
||||
mtx_lock(&mountlist_mtx);
|
||||
TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list);
|
||||
mtx_unlock(&mountlist_mtx);
|
||||
|
||||
set_rootvnode();
|
||||
|
||||
error = kern_symlink(td, "/", "dev", UIO_SYSSPACE);
|
||||
if (error)
|
||||
printf("kern_symlink /dev -> / returns %d\n", error);
|
||||
}
|
||||
|
||||
static void
|
||||
devfs_fixup(struct thread *td)
|
||||
{
|
||||
struct nameidata nd;
|
||||
struct vnode *vp, *dvp;
|
||||
struct mount *mp;
|
||||
int error;
|
||||
|
||||
/* Remove our devfs mount from the mountlist and purge the cache */
|
||||
mtx_lock(&mountlist_mtx);
|
||||
mp = TAILQ_FIRST(&mountlist);
|
||||
TAILQ_REMOVE(&mountlist, mp, mnt_list);
|
||||
mtx_unlock(&mountlist_mtx);
|
||||
cache_purgevfs(mp);
|
||||
|
||||
VFS_ROOT(mp, LK_EXCLUSIVE, &dvp);
|
||||
VI_LOCK(dvp);
|
||||
dvp->v_iflag &= ~VI_MOUNT;
|
||||
VI_UNLOCK(dvp);
|
||||
dvp->v_mountedhere = NULL;
|
||||
|
||||
/* Set up the real rootvnode, and purge the cache */
|
||||
TAILQ_FIRST(&mountlist)->mnt_vnodecovered = NULL;
|
||||
set_rootvnode();
|
||||
cache_purgevfs(rootvnode->v_mount);
|
||||
|
||||
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td);
|
||||
error = namei(&nd);
|
||||
if (error) {
|
||||
printf("Lookup of /dev for devfs, error: %d\n", error);
|
||||
vput(dvp);
|
||||
vfs_unbusy(mp);
|
||||
return;
|
||||
}
|
||||
NDFREE(&nd, NDF_ONLY_PNBUF);
|
||||
vp = nd.ni_vp;
|
||||
if (vp->v_type != VDIR) {
|
||||
printf("/dev is not a directory\n");
|
||||
vput(dvp);
|
||||
vput(vp);
|
||||
vfs_unbusy(mp);
|
||||
return;
|
||||
}
|
||||
error = vinvalbuf(vp, V_SAVE, 0, 0);
|
||||
if (error) {
|
||||
printf("vinvalbuf() of /dev failed, error: %d\n", error);
|
||||
vput(dvp);
|
||||
vput(vp);
|
||||
vfs_unbusy(mp);
|
||||
return;
|
||||
}
|
||||
cache_purge(vp);
|
||||
mp->mnt_vnodecovered = vp;
|
||||
vp->v_mountedhere = mp;
|
||||
mtx_lock(&mountlist_mtx);
|
||||
TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
|
||||
mtx_unlock(&mountlist_mtx);
|
||||
VOP_UNLOCK(vp, 0);
|
||||
vput(dvp);
|
||||
vfs_unbusy(mp);
|
||||
|
||||
/* Unlink the no longer needed /dev/dev -> / symlink */
|
||||
error = kern_unlink(td, "/dev/dev", UIO_SYSSPACE);
|
||||
if (error)
|
||||
printf("kern_unlink of /dev/dev failed, error: %d\n", error);
|
||||
}
|
||||
|
||||
void
|
||||
vfs_mountroot(void)
|
||||
{
|
||||
char *cp, *cpt, *options, *tmpdev;
|
||||
int error, i, asked = 0;
|
||||
|
||||
options = NULL;
|
||||
|
||||
root_mount_prepare();
|
||||
|
||||
devfs_first();
|
||||
|
||||
/*
|
||||
* We are booted with instructions to prompt for the root filesystem.
|
||||
*/
|
||||
if (boothowto & RB_ASKNAME) {
|
||||
if (!vfs_mountroot_ask())
|
||||
goto mounted;
|
||||
asked = 1;
|
||||
}
|
||||
|
||||
options = getenv("vfs.root.mountfrom.options");
|
||||
|
||||
/*
|
||||
* The root filesystem information is compiled in, and we are
|
||||
* booted with instructions to use it.
|
||||
*/
|
||||
if (ctrootdevname != NULL && (boothowto & RB_DFLTROOT)) {
|
||||
if (!vfs_mountroot_try(ctrootdevname, options))
|
||||
goto mounted;
|
||||
ctrootdevname = NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* We've been given the generic "use CDROM as root" flag. This is
|
||||
* necessary because one media may be used in many different
|
||||
* devices, so we need to search for them.
|
||||
*/
|
||||
if (boothowto & RB_CDROM) {
|
||||
for (i = 0; cdrom_rootdevnames[i] != NULL; i++) {
|
||||
if (!vfs_mountroot_try(cdrom_rootdevnames[i], options))
|
||||
goto mounted;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Try to use the value read by the loader from /etc/fstab, or
|
||||
* supplied via some other means. This is the preferred
|
||||
* mechanism.
|
||||
*/
|
||||
cp = getenv("vfs.root.mountfrom");
|
||||
if (cp != NULL) {
|
||||
cpt = cp;
|
||||
while ((tmpdev = strsep(&cpt, " \t")) != NULL) {
|
||||
error = vfs_mountroot_try(tmpdev, options);
|
||||
if (error == 0) {
|
||||
freeenv(cp);
|
||||
goto mounted;
|
||||
}
|
||||
}
|
||||
freeenv(cp);
|
||||
}
|
||||
|
||||
/*
|
||||
* Try values that may have been computed by code during boot
|
||||
*/
|
||||
if (!vfs_mountroot_try(rootdevnames[0], options))
|
||||
goto mounted;
|
||||
if (!vfs_mountroot_try(rootdevnames[1], options))
|
||||
goto mounted;
|
||||
|
||||
/*
|
||||
* If we (still) have a compiled-in default, try it.
|
||||
*/
|
||||
if (ctrootdevname != NULL)
|
||||
if (!vfs_mountroot_try(ctrootdevname, options))
|
||||
goto mounted;
|
||||
/*
|
||||
* Everything so far has failed, prompt on the console if we haven't
|
||||
* already tried that.
|
||||
*/
|
||||
if (!asked)
|
||||
if (!vfs_mountroot_ask())
|
||||
goto mounted;
|
||||
|
||||
panic("Root mount failed, startup aborted.");
|
||||
|
||||
mounted:
|
||||
root_mount_done();
|
||||
freeenv(options);
|
||||
}
|
||||
|
||||
static struct mntarg *
|
||||
parse_mountroot_options(struct mntarg *ma, const char *options)
|
||||
{
|
||||
char *p;
|
||||
char *name, *name_arg;
|
||||
char *val, *val_arg;
|
||||
char *opts;
|
||||
|
||||
if (options == NULL || options[0] == '\0')
|
||||
return (ma);
|
||||
|
||||
p = opts = strdup(options, M_MOUNT);
|
||||
if (opts == NULL) {
|
||||
return (ma);
|
||||
}
|
||||
|
||||
while((name = strsep(&p, ",")) != NULL) {
|
||||
if (name[0] == '\0')
|
||||
break;
|
||||
|
||||
val = strchr(name, '=');
|
||||
if (val != NULL) {
|
||||
*val = '\0';
|
||||
++val;
|
||||
}
|
||||
if( strcmp(name, "rw") == 0 ||
|
||||
strcmp(name, "noro") == 0) {
|
||||
/*
|
||||
* The first time we mount the root file system,
|
||||
* we need to mount 'ro', so We need to ignore
|
||||
* 'rw' and 'noro' mount options.
|
||||
*/
|
||||
continue;
|
||||
}
|
||||
name_arg = strdup(name, M_MOUNT);
|
||||
val_arg = NULL;
|
||||
if (val != NULL)
|
||||
val_arg = strdup(val, M_MOUNT);
|
||||
|
||||
ma = mount_arg(ma, name_arg, val_arg,
|
||||
(val_arg != NULL ? -1 : 0));
|
||||
}
|
||||
free(opts, M_MOUNT);
|
||||
return (ma);
|
||||
}
|
||||
|
||||
/*
|
||||
* Mount (mountfrom) as the root filesystem.
|
||||
*/
|
||||
static int
|
||||
vfs_mountroot_try(const char *mountfrom, const char *options)
|
||||
{
|
||||
struct mount *mp;
|
||||
struct mntarg *ma;
|
||||
char *vfsname, *path;
|
||||
time_t timebase;
|
||||
int error;
|
||||
char patt[32];
|
||||
char errmsg[255];
|
||||
|
||||
vfsname = NULL;
|
||||
path = NULL;
|
||||
mp = NULL;
|
||||
ma = NULL;
|
||||
error = EINVAL;
|
||||
bzero(errmsg, sizeof(errmsg));
|
||||
|
||||
if (mountfrom == NULL)
|
||||
return (error); /* don't complain */
|
||||
printf("Trying to mount root from %s\n", mountfrom);
|
||||
|
||||
/* parse vfs name and path */
|
||||
vfsname = malloc(MFSNAMELEN, M_MOUNT, M_WAITOK);
|
||||
path = malloc(MNAMELEN, M_MOUNT, M_WAITOK);
|
||||
vfsname[0] = path[0] = 0;
|
||||
sprintf(patt, "%%%d[a-z0-9]:%%%ds", MFSNAMELEN, MNAMELEN);
|
||||
if (sscanf(mountfrom, patt, vfsname, path) < 1)
|
||||
goto out;
|
||||
|
||||
if (path[0] == '\0')
|
||||
strcpy(path, ROOTNAME);
|
||||
|
||||
ma = mount_arg(ma, "fstype", vfsname, -1);
|
||||
ma = mount_arg(ma, "fspath", "/", -1);
|
||||
ma = mount_arg(ma, "from", path, -1);
|
||||
ma = mount_arg(ma, "errmsg", errmsg, sizeof(errmsg));
|
||||
ma = mount_arg(ma, "ro", NULL, 0);
|
||||
ma = parse_mountroot_options(ma, options);
|
||||
error = kernel_mount(ma, MNT_ROOTFS);
|
||||
|
||||
if (error == 0) {
|
||||
/*
|
||||
* We mount devfs prior to mounting the / FS, so the first
|
||||
* entry will typically be devfs.
|
||||
*/
|
||||
mp = TAILQ_FIRST(&mountlist);
|
||||
KASSERT(mp != NULL, ("%s: mountlist is empty", __func__));
|
||||
|
||||
/*
|
||||
* Iterate over all currently mounted file systems and use
|
||||
* the time stamp found to check and/or initialize the RTC.
|
||||
* Typically devfs has no time stamp and the only other FS
|
||||
* is the actual / FS.
|
||||
* Call inittodr() only once and pass it the largest of the
|
||||
* timestamps we encounter.
|
||||
*/
|
||||
timebase = 0;
|
||||
do {
|
||||
if (mp->mnt_time > timebase)
|
||||
timebase = mp->mnt_time;
|
||||
mp = TAILQ_NEXT(mp, mnt_list);
|
||||
} while (mp != NULL);
|
||||
inittodr(timebase);
|
||||
|
||||
devfs_fixup(curthread);
|
||||
}
|
||||
|
||||
if (error != 0 ) {
|
||||
printf("ROOT MOUNT ERROR: %s\n", errmsg);
|
||||
printf("If you have invalid mount options, reboot, and ");
|
||||
printf("first try the following from\n");
|
||||
printf("the loader prompt:\n\n");
|
||||
printf(" set vfs.root.mountfrom.options=rw\n\n");
|
||||
printf("and then remove invalid mount options from ");
|
||||
printf("/etc/fstab.\n\n");
|
||||
}
|
||||
out:
|
||||
free(path, M_MOUNT);
|
||||
free(vfsname, M_MOUNT);
|
||||
return (error);
|
||||
}
|
||||
|
||||
static int
|
||||
vfs_mountroot_ask(void)
|
||||
{
|
||||
char name[128];
|
||||
char *mountfrom;
|
||||
char *options;
|
||||
|
||||
for(;;) {
|
||||
printf("Loader variables:\n");
|
||||
printf("vfs.root.mountfrom=");
|
||||
mountfrom = getenv("vfs.root.mountfrom");
|
||||
if (mountfrom != NULL) {
|
||||
printf("%s", mountfrom);
|
||||
}
|
||||
printf("\n");
|
||||
printf("vfs.root.mountfrom.options=");
|
||||
options = getenv("vfs.root.mountfrom.options");
|
||||
if (options != NULL) {
|
||||
printf("%s", options);
|
||||
}
|
||||
printf("\n");
|
||||
freeenv(mountfrom);
|
||||
freeenv(options);
|
||||
printf("\nManual root filesystem specification:\n");
|
||||
printf(" <fstype>:<device> Mount <device> using filesystem <fstype>\n");
|
||||
printf(" eg. zfs:tank\n");
|
||||
printf(" eg. ufs:/dev/da0s1a\n");
|
||||
printf(" eg. cd9660:/dev/acd0\n");
|
||||
printf(" This is equivalent to: ");
|
||||
printf("mount -t cd9660 /dev/acd0 /\n");
|
||||
printf("\n");
|
||||
printf(" ? List valid disk boot devices\n");
|
||||
printf(" <empty line> Abort manual input\n");
|
||||
printf("\nmountroot> ");
|
||||
gets(name, sizeof(name), 1);
|
||||
if (name[0] == '\0')
|
||||
return (1);
|
||||
if (name[0] == '?') {
|
||||
printf("\nList of GEOM managed disk devices:\n ");
|
||||
g_dev_print();
|
||||
continue;
|
||||
}
|
||||
if (!vfs_mountroot_try(name, NULL))
|
||||
return (0);
|
||||
}
|
||||
}
|
Loading…
Reference in New Issue
Block a user