Differential D14715 Diff 40807 sys/kern/vfs_mountroot.c

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sys/kern/vfs_mountroot.c

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/*		/*
* Mount of the system's /dev.		* Mount of the system's /dev.
*/		*/
struct mount *rootdevmp;		struct mount *rootdevmp;

char *rootdevnames[2] = {NULL, NULL};		char *rootdevnames[2] = {NULL, NULL};

		/*
		* Hooks into md(4) for mount.conf(8)'s .md support. Stored here as
		* this is the only place they are used. Great care should be taken
		* when expanding use as crashes may occur if md(4) is unloaded during
		* calls.
		*/
		int (kern_mdattach_p)(struct thread td, struct md_req *mdr);
		int (kern_mddetach_p)(struct thread td, struct md_req *mdr);

struct mtx root_holds_mtx;		struct mtx root_holds_mtx;
MTX_SYSINIT(root_holds, &root_holds_mtx, "root_holds", MTX_DEF);		MTX_SYSINIT(root_holds, &root_holds_mtx, "root_holds", MTX_DEF);

struct root_hold_token {		struct root_hold_token {
const char *who;		const char *who;
LIST_ENTRY(root_hold_token) list;		LIST_ENTRY(root_hold_token) list;
};		};

▲ Show 20 Lines • Show All 423 Lines • ▼ Show 20 Lines	parse_dir_ask(char **conf)
return (error);		return (error);
}		}

static int		static int
parse_dir_md(char **conf)		parse_dir_md(char **conf)
{		{
struct stat sb;		struct stat sb;
struct thread *td;		struct thread *td;
struct md_ioctl *mdio;		struct md_req mdr;
char path, tok;		char *path;
int error, fd, len;		int error;

		if (kern_mdattach_p == NULL \|\| kern_mddetach_p == NULL)
		return (ENOENT);

td = curthread;		td = curthread;

error = parse_token(conf, &tok);		error = parse_token(conf, &path);
if (error)		if (error)
return (error);		return (error);

len = strlen(tok);
mdio = malloc(sizeof(*mdio) + len + 1, M_TEMP, M_WAITOK \| M_ZERO);
path = (void *)(mdio + 1);
bcopy(tok, path, len);
free(tok, M_TEMP);

/* Get file status. */		/* Get file status. */
error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &sb, NULL);		error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &sb, NULL);
if (error)		if (error)
goto out;		goto out;

/* Open /dev/mdctl so that we can attach/detach. */		bzero(&mdr, sizeof(mdr));
error = kern_openat(td, AT_FDCWD, "/dev/" MDCTL_NAME, UIO_SYSSPACE,		mdr.md_type = MD_VNODE;
O_RDWR, 0);
if (error)
goto out;

fd = td->td_retval[0];
mdio->md_version = MDIOVERSION;
mdio->md_type = MD_VNODE;

if (root_mount_mddev != -1) {		if (root_mount_mddev != -1) {
mdio->md_unit = root_mount_mddev;		mdr.md_unit = root_mount_mddev;
error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio);		error = kern_mddetach_p(td, &mdr);
/* Ignore errors. We don't care. */		/* Ignore errors. We don't care. */
root_mount_mddev = -1;		root_mount_mddev = -1;
}		}

mdio->md_file = (void *)(mdio + 1);		mdr.md_file = path;
mdio->md_options = MD_AUTOUNIT \| MD_READONLY;		mdr.md_file_seg = UIO_SYSSPACE;
mdio->md_mediasize = sb.st_size;		mdr.md_options = MD_AUTOUNIT \| MD_READONLY;
mdio->md_unit = 0;		mdr.md_mediasize = sb.st_size;
error = kern_ioctl(td, fd, MDIOCATTACH, (void *)mdio);		mdr.md_unit = 0;
		error = kern_mdattach_p(td, &mdr);
		kibUnsubmitted Not Done Inline Actions FYI: This conflicts with D14712 kib: FYI: This conflicts with D14712
if (error)		if (error)
goto out;		goto out;

if (mdio->md_unit > 9) {		if (mdr.md_unit > 9) {
printf("rootmount: too many md units\n");		printf("rootmount: too many md units\n");
mdio->md_file = NULL;		mdr.md_file = NULL;
mdio->md_options = 0;		mdr.md_options = 0;
mdio->md_mediasize = 0;		mdr.md_mediasize = 0;
error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio);		error = kern_mddetach_p(td, &mdr);
/* Ignore errors. We don't care. */		/* Ignore errors. We don't care. */
error = ERANGE;		error = ERANGE;
goto out;		goto out;
}		}

root_mount_mddev = mdio->md_unit;		root_mount_mddev = mdr.md_unit;
printf(MD_NAME "%u attached to %s\n", root_mount_mddev, mdio->md_file);		printf(MD_NAME "%u attached to %s\n", root_mount_mddev, path);

error = kern_close(td, fd);

out:		out:
free(mdio, M_TEMP);		free(path, M_TEMP);
return (error);		return (error);
}		}

static int		static int
parse_dir_onfail(char **conf)		parse_dir_onfail(char **conf)
{		{
char *action;		char *action;
int error;		int error;
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