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Document the mntopts(3) functions.

Browse Source 
The mntopts(3) functions support operations associated with a mount
point. The main purpose of this commit is to document the mntopts(3)
functions that now appear in 18 utilities in the base system. See
mntopts(3) for the documentation details.

The getmntopts() function appeared in 4.4BSD. The build_iovec(),
build_iovec_argf(), free_iovec(), checkpath(), and rmslashes()
functions were added with nmount(8) in FreeBSD 5.0. The getmntpoint()
and chkdoreload() functions are being added in this commit.

These functions should be in a library but for historic reasons are
in a file in the sources for the mount(8) program. Thus, to access
them the following lines need to be added to the Makefile of the
program wanting to use them:

SRCS+= getmntopts.c
MOUNT= ${SRCTOP}/sbin/mount
CFLAGS+= -I${MOUNT}
.PATH: ${MOUNT}

Once these changes have been MFC'ed to 13 they may be made into
a library.

Reviewed by:  kib, gbe
MFC after:    2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D37907
This commit is contained in:
Kirk McKusick 2023-01-15 10:20:48 -08:00
parent 6468b6b23e
commit 906c312bbf
13 changed files with 513 additions and 468 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
sbin/fsck/Makefile
View File

@ -4,6 +4,10 @@
PACKAGE=runtime
PROG= fsck
SRCS= fsck.c fsutil.c preen.c
SRCS+= getmntopts.c
MAN= fsck.8
MOUNT= ${SRCTOP}/sbin/mount
CFLAGS+= -I${MOUNT}
.PATH: ${MOUNT}
.include <bsd.prog.mk>

5
sbin/fsck/fsck.c
View File

@ -50,6 +50,7 @@ __FBSDID("$FreeBSD$");
#include <err.h>
#include <fstab.h>
#include <fcntl.h>
#include <mntopts.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
@ -206,7 +207,7 @@ main(int argc, char *argv[])
_PATH_DEV, spec);
spec = device;
}
mntp = getmntpt(spec);
mntp = getmntpoint(spec);
if (mntp != NULL) {
spec = mntp->f_mntfromname;
mntpt = mntp->f_mntonname;
@ -269,7 +270,7 @@ isok(struct fstab *fs)
if (flags & DO_BACKGRD) {
if (!strcmp(fs->fs_type, FSTAB_RO))
return (0);
if (getmntpt(fs->fs_spec) == NULL)
if (getmntpoint(fs->fs_spec) == NULL)
return (0);
if (checkfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file, "-F", 0))
return (0);

44
sbin/fsck/fsutil.c
View File

@ -188,50 +188,6 @@ devcheck(const char *origname)
return (origname);
}
/*
* Get the mount point information for name.
*/
struct statfs *
getmntpt(const char *name)
{
struct stat devstat, mntdevstat;
char device[sizeof(_PATH_DEV) - 1 + MNAMELEN];
char *dev_name;
struct statfs *mntbuf, *statfsp;
int i, mntsize, isdev;
if (stat(name, &devstat) != 0)
return (NULL);
if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode))
isdev = 1;
else
isdev = 0;
mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
for (i = 0; i < mntsize; i++) {
statfsp = &mntbuf[i];
dev_name = statfsp->f_mntfromname;
if (*dev_name != '/') {
if (strlen(_PATH_DEV) + strlen(dev_name) + 1 >
sizeof(statfsp->f_mntfromname))
continue;
strcpy(device, _PATH_DEV);
strcat(device, dev_name);
strcpy(statfsp->f_mntfromname, device);
}
if (isdev == 0) {
if (strcmp(name, statfsp->f_mntonname))
continue;
return (statfsp);
}
if (stat(dev_name, &mntdevstat) == 0 &&
mntdevstat.st_rdev == devstat.st_rdev)
return (statfsp);
}
statfsp = NULL;
return (statfsp);
}
void *
emalloc(size_t s)
{

1
sbin/fsck/fsutil.h
View File

@ -39,7 +39,6 @@ void panic(const char *, ...) __dead2 __printflike(1, 2);
const char *devcheck(const char *);
const char *cdevname(void);
void setcdevname(const char *, int);
struct statfs *getmntpt(const char *);
void *emalloc(size_t);
void *erealloc(void *, size_t);
char *estrdup(const char *);

96
sbin/fsck_ffs/main.c
View File

@ -76,8 +76,6 @@ static void usage(void) __dead2;
static intmax_t argtoimax(int flag, const char *req, const char *str, int base);
static int checkfilesys(char *filesys);
static int setup_bkgrdchk(struct statfs *mntp, int sbrdfailed, char **filesys);
static int chkdoreload(struct statfs *mntp);
static struct statfs *getmntpt(const char *);
int
main(int argc, char *argv[])
@ -258,7 +256,7 @@ checkfilesys(char *filesys)
* if it is listed among the mounted file systems. Failing that
* check to see if it is listed in /etc/fstab.
*/
mntp = getmntpt(filesys);
mntp = getmntpoint(filesys);
if (mntp != NULL)
filesys = mntp->f_mntfromname;
else
@ -311,7 +309,7 @@ checkfilesys(char *filesys)
(FS_UNCLEAN | FS_NEEDSFSCK)) == 0) {
bufinit();
gjournal_check(filesys);
if (chkdoreload(mntp) == 0)
if (chkdoreload(mntp, pwarn) == 0)
exit(0);
exit(4);
} else {
@ -357,7 +355,7 @@ checkfilesys(char *filesys)
sujrecovery = 1;
if (suj_check(filesys) == 0) {
printf("\n***** FILE SYSTEM MARKED CLEAN *****\n");
if (chkdoreload(mntp) == 0)
if (chkdoreload(mntp, pwarn) == 0)
exit(0);
exit(4);
}
@ -561,7 +559,7 @@ checkfilesys(char *filesys)
return (ERESTART);
printf("\n***** PLEASE RERUN FSCK *****\n");
}
if (chkdoreload(mntp) != 0) {
if (chkdoreload(mntp, pwarn) != 0) {
if (!fsmodified)
return (0);
if (!preen)
@ -715,92 +713,6 @@ setup_bkgrdchk(struct statfs *mntp, int sbreadfailed, char **filesys)
return (1);
}
static int
chkdoreload(struct statfs *mntp)
{
struct iovec *iov;
int iovlen;
char errmsg[255];
if (mntp == NULL)
return (0);
iov = NULL;
iovlen = 0;
errmsg[0] = '\0';
/*
* We modified a mounted file system. Do a mount update on
* it unless it is read-write, so we can continue using it
* as safely as possible.
*/
if (mntp->f_flags & MNT_RDONLY) {
build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
build_iovec(&iov, &iovlen, "from", mntp->f_mntfromname,
(size_t)-1);
build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
(size_t)-1);
build_iovec(&iov, &iovlen, "errmsg", errmsg,
sizeof(errmsg));
build_iovec(&iov, &iovlen, "update", NULL, 0);
build_iovec(&iov, &iovlen, "reload", NULL, 0);
/*
* XX: We need the following line until we clean up
* nmount parsing of root mounts and NFS root mounts.
*/
build_iovec(&iov, &iovlen, "ro", NULL, 0);
if (nmount(iov, iovlen, mntp->f_flags) == 0) {
return (0);
}
pwarn("mount reload of '%s' failed: %s %s\n\n",
mntp->f_mntonname, strerror(errno), errmsg);
return (1);
}
return (0);
}
/*
* Get the mount point information for name.
*/
static struct statfs *
getmntpt(const char *name)
{
struct stat devstat, mntdevstat;
char device[sizeof(_PATH_DEV) - 1 + MNAMELEN];
char *ddevname;
struct statfs *mntbuf, *statfsp;
int i, mntsize, isdev;
if (stat(name, &devstat) != 0)
return (NULL);
if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode))
isdev = 1;
else
isdev = 0;
mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
for (i = 0; i < mntsize; i++) {
statfsp = &mntbuf[i];
ddevname = statfsp->f_mntfromname;
if (*ddevname != '/') {
if (strlen(_PATH_DEV) + strlen(ddevname) + 1 >
sizeof(statfsp->f_mntfromname))
continue;
strcpy(device, _PATH_DEV);
strcat(device, ddevname);
strcpy(statfsp->f_mntfromname, device);
}
if (isdev == 0) {
if (strcmp(name, statfsp->f_mntonname))
continue;
return (statfsp);
}
if (stat(ddevname, &mntdevstat) == 0 &&
mntdevstat.st_rdev == devstat.st_rdev)
return (statfsp);
}
statfsp = NULL;
return (statfsp);
}
static void
usage(void)
{

110
sbin/growfs/growfs.c
View File

@ -118,7 +118,6 @@ static void updjcg(int, time_t, int, int, unsigned int);
static void updcsloc(time_t, int, int, unsigned int);
static void frag_adjust(ufs2_daddr_t, int);
static void updclst(int);
static void mount_reload(const struct statfs *stfs);
static void cgckhash(struct cg *);
/*
@ -1263,76 +1262,11 @@ is_dev(const char *name)
return (1);
}
/*
* Return mountpoint on which the device is currently mounted.
*/
static const struct statfs *
dev_to_statfs(const char *dev)
{
struct stat devstat, mntdevstat;
struct statfs *mntbuf, *statfsp;
char device[MAXPATHLEN];
char *mntdevname;
int i, mntsize;
/*
* First check the mounted filesystems.
*/
if (stat(dev, &devstat) != 0)
return (NULL);
if (!S_ISCHR(devstat.st_mode) && !S_ISBLK(devstat.st_mode))
return (NULL);
mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
for (i = 0; i < mntsize; i++) {
statfsp = &mntbuf[i];
mntdevname = statfsp->f_mntfromname;
if (*mntdevname != '/') {
strcpy(device, _PATH_DEV);
strcat(device, mntdevname);
mntdevname = device;
}
if (stat(mntdevname, &mntdevstat) == 0 &&
mntdevstat.st_rdev == devstat.st_rdev)
return (statfsp);
}
return (NULL);
}
static const char *
mountpoint_to_dev(const char *mountpoint)
{
struct statfs *mntbuf, *statfsp;
struct fstab *fs;
int i, mntsize;
/*
* First check the mounted filesystems.
*/
mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
for (i = 0; i < mntsize; i++) {
statfsp = &mntbuf[i];
if (strcmp(statfsp->f_mntonname, mountpoint) == 0)
return (statfsp->f_mntfromname);
}
/*
* Check the fstab.
*/
fs = getfsfile(mountpoint);
if (fs != NULL)
return (fs->fs_spec);
return (NULL);
}
static const char *
getdev(const char *name)
getdev(const char *name, struct statfs *statfsp)
{
static char device[MAXPATHLEN];
const char *cp, *dev;
const char *cp;
if (is_dev(name))
return (name);
@ -1344,9 +1278,8 @@ getdev(const char *name)
return (device);
}
dev = mountpoint_to_dev(name);
if (dev != NULL && is_dev(dev))
return (dev);
if (statfsp != NULL)
return (statfsp->f_mntfromname);
return (NULL);
}
@ -1378,7 +1311,7 @@ main(int argc, char **argv)
DBG_FUNC("main")
struct fs *fs;
const char *device;
const struct statfs *statfsp;
struct statfs *statfsp;
uint64_t size = 0;
off_t mediasize;
int error, j, fsi, fso, ch, ret, Nflag = 0, yflag = 0;
@ -1430,12 +1363,11 @@ main(int argc, char **argv)
/*
* Now try to guess the device name.
*/
device = getdev(*argv);
statfsp = getmntpoint(*argv);
device = getdev(*argv, statfsp);
if (device == NULL)
errx(1, "cannot find special device for %s", *argv);
statfsp = dev_to_statfs(device);
fsi = open(device, O_RDONLY);
if (fsi < 0)
err(1, "%s", device);
@ -1666,8 +1598,9 @@ main(int argc, char **argv)
error = close(fso);
if (error != 0)
err(1, "close");
if (statfsp != NULL && (statfsp->f_flags & MNT_RDONLY) != 0)
mount_reload(statfsp);
if (statfsp != NULL && (statfsp->f_flags & MNT_RDONLY) != 0 &&
chkdoreload(statfsp, warn) != 0)
exit(9);
}
DBG_CLOSE;
@ -1734,29 +1667,6 @@ updclst(int block)
return;
}
static void
mount_reload(const struct statfs *stfs)
{
char errmsg[255];
struct iovec *iov;
int iovlen;
iov = NULL;
iovlen = 0;
*errmsg = '\0';
build_iovec(&iov, &iovlen, "fstype", __DECONST(char *, "ffs"), 4);
build_iovec(&iov, &iovlen, "fspath", __DECONST(char *, stfs->f_mntonname), (size_t)-1);
build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
build_iovec(&iov, &iovlen, "update", NULL, 0);
build_iovec(&iov, &iovlen, "reload", NULL, 0);
if (nmount(iov, iovlen, stfs->f_flags) < 0) {
errmsg[sizeof(errmsg) - 1] = '\0';
err(9, "%s: cannot reload filesystem%s%s", stfs->f_mntonname,
*errmsg != '\0' ? ": " : "", errmsg);
}
}
/*
* Calculate the check-hash of the cylinder group.
*/

11
sbin/mount/Makefile
View File

@ -4,8 +4,15 @@
PACKAGE=runtime
PROG= mount
SRCS= mount.c mount_fs.c getmntopts.c vfslist.c
MAN= mount.8
# We do NOT install the getmntopts.3 man page.
MAN= mntopts.3 mount.8
MLINKS+= mntopts.3 getmntopts.3
MLINKS+= mntopts.3 getmntpoint.3
MLINKS+= mntopts.3 chkdoreload.3
MLINKS+= mntopts.3 build_iovec.3
MLINKS+= mntopts.3 build_iovec_argf.3
MLINKS+= mntopts.3 free_iovec.3
MLINKS+= mntopts.3 checkpath.3
MLINKS+= mntopts.3 rmslashes.3
LIBADD= util xo

181
sbin/mount/getmntopts.3
View File

@ -1,181 +0,0 @@
.\" Copyright (c) 1994
.\" The Regents of the University of California. All rights reserved.
.\"
.\" 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.
.\" 3. 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 REGENTS 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 REGENTS 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.
.\"
.\" @(#)getmntopts.3 8.3 (Berkeley) 3/30/95
.\" $FreeBSD$
.\"
.Dd February 17, 2008
.Dt GETMNTOPTS 3
.Os
.Sh NAME
.Nm getmntopts
.Nd scan mount options
.Sh SYNOPSIS
.Fd #include \&"mntopts.h"
.Ft void
.Fo getmntopts
.Fa "const char *options" "const struct mntopt *mopts"
.Fa "int *flagp" "int *altflagp"
.Fc
.Sh DESCRIPTION
The
.Fn getmntopts
function takes a comma separated option list and a list
of valid option names, and computes the bitmask
corresponding to the requested set of options.
.Pp
The string
.Fa options
is broken down into a sequence of comma separated tokens.
Each token is looked up in the table described by
.Fa mopts
and the bits in
the word referenced by either
.Fa flagp
or
.Fa altflagp
(depending on the
.Va m_altloc
field of the option's table entry)
are updated.
The flag words are not initialized by
.Fn getmntopts .
The table,
.Fa mopts ,
has the following format:
.Bd -literal
struct mntopt {
char *m_option; /* option name */
int m_inverse; /* is this a negative option, e.g., "dev" */
int m_flag; /* bit to set, e.g., MNT_RDONLY */
int m_altloc; /* non-zero to use altflagp rather than flagp */
};
.Ed
.Pp
The members of this structure are:
.Bl -tag -width m_inverse
.It Va m_option
the option name,
for example
.Dq Li suid .
.It Va m_inverse
tells
.Fn getmntopts
that the name has the inverse meaning of the
bit.
For example,
.Dq Li suid
is the string, whereas the
mount flag is
.Dv MNT_NOSUID .
In this case, the sense of the string and the flag
are inverted, so the
.Va m_inverse
flag should be set.
.It Va m_flag
the value of the bit to be set or cleared in
the flag word when the option is recognized.
The bit is set when the option is discovered,
but cleared if the option name was preceded
by the letters
.Dq Li no .
The
.Va m_inverse
flag causes these two operations to be reversed.
.It Va m_altloc
the bit should be set or cleared in
.Fa altflagp
rather than
.Fa flagp .
.El
.Pp
Each of the user visible
.Dv MNT_
flags has a corresponding
.Dv MOPT_
macro which defines an appropriate
.Vt "struct mntopt"
entry.
To simplify the program interface and ensure consistency across all
programs, a general purpose macro,
.Dv MOPT_STDOPTS ,
is defined which
contains an entry for all the generic VFS options.
In addition, the macros
.Dv MOPT_FORCE
and
.Dv MOPT_UPDATE
exist to enable the
.Dv MNT_FORCE
and
.Dv MNT_UPDATE
flags to be set.
Finally, the table must be terminated by an entry with a
.Dv NULL
first element.
.Sh EXAMPLES
Most commands will use the standard option set.
Local file systems which support the
.Dv MNT_UPDATE
flag, would also have an
.Dv MOPT_UPDATE
entry.
This can be declared and used as follows:
.Bd -literal
#include "mntopts.h"
struct mntopt mopts[] = {
MOPT_STDOPTS,
MOPT_UPDATE,
{ NULL }
};
...
mntflags = mntaltflags = 0;
...
getmntopts(options, mopts, &mntflags, &mntaltflags);
...
.Ed
.Sh DIAGNOSTICS
If the external integer variable
.Va getmnt_silent
is zero, then the
.Fn getmntopts
function displays an error message and exits if an
unrecognized option is encountered.
Otherwise unrecognized options are silently ignored.
By default
.Va getmnt_silent
is zero.
.Sh SEE ALSO
.Xr err 3 ,
.Xr mount 8
.Sh HISTORY
The
.Fn getmntopts
function appeared in
.Bx 4.4 .

95
sbin/mount/getmntopts.c
View File

@ -44,6 +44,7 @@ __FBSDID("$FreeBSD$");
#include <err.h>
#include <errno.h>
#include <paths.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
@ -153,6 +154,98 @@ checkpath_allow_file(const char *path, char *resolved)
return (0);
}
/*
* Get the mount point information for name. Name may be mount point name
* or device name (with or without /dev/ preprended).
*/
struct statfs *
getmntpoint(const char *name)
{
struct stat devstat, mntdevstat;
char device[sizeof(_PATH_DEV) - 1 + MNAMELEN];
char *ddevname;
struct statfs *mntbuf, *statfsp;
int i, mntsize, isdev;
if (stat(name, &devstat) != 0)
return (NULL);
if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode))
isdev = 1;
else
isdev = 0;
mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
for (i = 0; i < mntsize; i++) {
statfsp = &mntbuf[i];
ddevname = statfsp->f_mntfromname;
if (*ddevname != '/') {
if (strlen(_PATH_DEV) + strlen(ddevname) + 1 >
sizeof(statfsp->f_mntfromname))
continue;
strcpy(device, _PATH_DEV);
strcat(device, ddevname);
strcpy(statfsp->f_mntfromname, device);
}
if (isdev == 0) {
if (strcmp(name, statfsp->f_mntonname))
continue;
return (statfsp);
}
if (stat(ddevname, &mntdevstat) == 0 &&
mntdevstat.st_rdev == devstat.st_rdev)
return (statfsp);
}
return (NULL);
}
/*
* If possible reload a mounted filesystem.
* When prtmsg != NULL print a warning if a reload is attempted, but fails.
* Return 0 on success, 1 on failure.
*/
int
chkdoreload(struct statfs *mntp,
void (*prtmsg)(const char *, ...) __printflike(1,2))
{
struct iovec *iov;
int iovlen, error;
char errmsg[255];
/*
* If the filesystem is not mounted it does not need to be reloaded.
* If it is mounted for writing, then it could not have been opened
* for writing by a utility, so does not need to be reloaded.
*/
if (mntp == NULL || (mntp->f_flags & MNT_RDONLY) == 0)
return (0);
/*
* We modified a mounted file system. Do a mount update on
* it so we can continue using it as safely as possible.
*/
iov = NULL;
iovlen = 0;
errmsg[0] = '\0';
build_iovec(&iov, &iovlen, "fstype", __DECONST(void *, "ffs"), 4);
build_iovec(&iov, &iovlen, "from", mntp->f_mntfromname, (size_t)-1);
build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname, (size_t)-1);
build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
build_iovec(&iov, &iovlen, "update", NULL, 0);
build_iovec(&iov, &iovlen, "reload", NULL, 0);
/*
* XX: We need the following line until we clean up
* nmount parsing of root mounts and NFS root mounts.
*/
build_iovec(&iov, &iovlen, "ro", NULL, 0);
error = nmount(iov, iovlen, mntp->f_flags);
free_iovec(&iov, &iovlen);
if (error == 0)
return (0);
if (prtmsg != NULL)
prtmsg("mount reload of '%s' failed: %s %s\n\n",
mntp->f_mntonname, strerror(errno), errmsg);
return (1);
}
void
build_iovec(struct iovec **iov, int *iovlen, const char *name, void *val,
size_t len)
@ -207,7 +300,7 @@ free_iovec(struct iovec **iov, int *iovlen)
{
int i;
for (i = 0; i < *iovlen; i++)
for (i = 0; i < *iovlen; i += 2)
free((*iov)[i].iov_base);
free(*iov);
}

381
sbin/mount/mntopts.3 Normal file
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@ -0,0 +1,381 @@
.\" Copyright (c) 2023 Marshall Kirk McKusick
.\" Copyright (c) 1994 The Regents of the University of California.
.\"
.\" 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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.
.\"
.\" @(#)getmntopts.3 8.3 (Berkeley) 3/30/95
.\"
.Dd January 19, 2023
.Dt MNTOPTS 3
.Os
.Sh NAME
.Nm getmntopts ,
.Nm getmntpoint ,
.Nm chkdoreload ,
.Nm build_iovec ,
.Nm build_iovec_argf ,
.Nm free_iovec ,
.Nm checkpath ,
.Nm rmslashes
.Nd "mount point operations"
.Sh SYNOPSIS
.In mntopts.h
.Ft void
.Fo getmntopts
.Fa "const char *options" "const struct mntopt *mopts"
.Fa "int *flagp" "int *altflagp"
.Fc
.Ft struct statfs *
.Fn getmntpoint "const char *name"
.Ft int
.Fo chkdoreload
.Fa "struct statfs *mntp"
.Fa "void (*prtmsg)(const char *fmt, ...)"
.Fc
.Ft void
.Fo build_iovec
.Fa "struct iovec **iov" "int *iovlen" "const char *name" "void *val"
.Fa "size_t len"
.Fc
.Ft void
.Fo build_iovec_argf
.Fa "struct iovec **iov" "int *iovlen" "const char *name"
.Fa "const char *fmt" "..."
.Fc
.Ft void
.Fn free_iovec "struct iovec **iov" "int *iovlen"
.Ft int
.Fn checkpath "const char *path" "char *resolved"
.Ft void
.Fn rmslashes "char *rrpin" "char *rrpout"
.Sh DESCRIPTION
The
.Nm mntopts
functions support operations associated with a mount point.
For historic reasons are in a file in the sources for the
.Xr mount 8
program.
Thus, to access them the following lines need to be added to the
.Nm Makefile
of the program wanting to use them:
.Bd -literal
SRCS+= getmntopts.c
MOUNT= ${SRCTOP}/sbin/mount
CFLAGS+= -I${MOUNT}
\&.PATH: ${MOUNT}
.Ed
.Pp
The
.Fn getmntopts
function takes a comma separated option list and a list
of valid option names, and computes the bitmask
corresponding to the requested set of options.
.Pp
The string
.Fa options
is broken down into a sequence of comma separated tokens.
Each token is looked up in the table described by
.Fa mopts
and the bits in
the word referenced by either
.Fa flagp
or
.Fa altflagp
(depending on the
.Va m_altloc
field of the option's table entry)
are updated.
The flag words are not initialized by
.Fn getmntopts .
The table,
.Fa mopts ,
has the following format:
.Bd -literal
struct mntopt {
char *m_option; /* option name */
int m_inverse; /* is this a negative option, e.g., "dev" */
int m_flag; /* bit to set, e.g., MNT_RDONLY */
int m_altloc; /* non-zero to use altflagp rather than flagp */
};
.Ed
.Pp
The members of this structure are:
.Bl -tag -width m_inverse
.It Va m_option
the option name,
for example
.Dq Li suid .
.It Va m_inverse
tells
.Fn getmntopts
that the name has the inverse meaning of the
bit.
For example,
.Dq Li suid
is the string, whereas the
mount flag is
.Dv MNT_NOSUID .
In this case, the sense of the string and the flag
are inverted, so the
.Va m_inverse
flag should be set.
.It Va m_flag
the value of the bit to be set or cleared in
the flag word when the option is recognized.
The bit is set when the option is discovered,
but cleared if the option name was preceded
by the letters
.Dq Li no .
The
.Va m_inverse
flag causes these two operations to be reversed.
.It Va m_altloc
the bit should be set or cleared in
.Fa altflagp
rather than
.Fa flagp .
.El
.Pp
Each of the user visible
.Dv MNT_
flags has a corresponding
.Dv MOPT_
macro which defines an appropriate
.Vt "struct mntopt"
entry.
To simplify the program interface and ensure consistency across all
programs, a general purpose macro,
.Dv MOPT_STDOPTS ,
is defined which
contains an entry for all the generic VFS options.
In addition, the macros
.Dv MOPT_FORCE
and
.Dv MOPT_UPDATE
exist to enable the
.Dv MNT_FORCE
and
.Dv MNT_UPDATE
flags to be set.
Finally, the table must be terminated by an entry with a
.Dv NULL
first element.
.Pp
The
.Fn getmntpoint
function takes the pathname of a possible mount point
or of a device (with or without
.Pa /dev/
prepended to it).
If the pathname is a directory or a file,
.Fn getmntpoint
checks to see if the mount point currently has a filesystem
mounted on it.
If the pathname is a device,
.Fn getmntpoint
checks to see if it is currently mounted.
If there is an associated mount, a pointer to a
.Vt "struct statfs"
is returned.
The returned result is stored in a static buffer that is over-written
each time the
.Fn getmntpoint
function or the
.Xr getmntinfo 3
library routine is called.
If no mount is found, NULL is returned.
.Pp
The
.Fn chkdoreload
function takes a pointer to a
.Vt "struct statfs" .
If the filesystem associated with the mount point is mounted read-only,
.Fn chkdoreload
requests the filesystem to reload all of its metadata from its backing store.
The second parameter is the function to call to print an error message
if the reload fails.
If no error message is desired, a
.Dv NULL
can be passed as the second argument.
The
.Fn chkdoreload
function returns zero on success or non-zero on failure.
.Pp
The
.Fn build_iovec
function adds a parameter to a list of parameters to be passed to the
.Xr nmount 2
system call.
The parameter list is built up in
.Va iov
and its length is kept in
.Va iovlen .
Before the first call to
.Fn build_iovec ,
.Va iov
should be set to
.Dv NULL
and
.Va iovlen
should be set to 0.
The parameter name is passed in
.Va name .
The value of the parameter name is pointed to by
.Va val .
The size of the value is passed in
.Va len .
If the value is a string, a
.Va len
of -1 is passed to indicate that the length should be determined using
.Xr strlen 3 .
If the parameter has no value,
.Va name
should be
.Dv NULL
and
.Va len
should be 0.
.Pp
The
.Fn build_iovec_argf
function adds a formatted parameter to a list of parameters to be passed
to the
.Xr nmount 2
system call.
The parameter list is built up in
.Va iov
and its length is kept in
.Va iovlen .
Before the first call to
.Fn build_iovec_argf ,
.Va iov
should be set to
.Dv NULL
and
.Va iovlen
should be set to 0.
The parameter name is passed in
.Va name .
The value of the parameter name is described by a format string pointed to by
.Va fmt .
If the parameter has no value,
.Va name
should be
.Dv NULL .
.Pp
The
.Fn free_iovec
function frees the memory in the
.Va iov
vector of the length specified in
.Va iovlen
that was previously allocated by the
.Fn build_iovec
and / or
.Fn build_iovec_argf
functions.
The
.Va iov
is set to
.Dv NULL
and the
.Va iovlen
is set to 0 to indicate that the space has been freed.
.Pp
The
.Fn checkpath
function uses
.Xr realpath 3
to verify that its
.Va path
argument is valid and references a directory.
The
.Fn checkpath
function returns zero on success or non-zero on failure.
.Pp
The
.Fn rmslashes
function removes all double slashes and trailing slashes from its
.Va rrpin
pathname parameter and returns the resulting pathname in its
.Va rrpout
parameter.
.Sh EXAMPLES
Most commands will use the standard option set.
Local file systems which support the
.Dv MNT_UPDATE
flag, would also have an
.Dv MOPT_UPDATE
entry.
This can be declared and used as follows:
.Bd -literal
#include "mntopts.h"
struct mntopt mopts[] = {
MOPT_STDOPTS,
MOPT_UPDATE,
{ NULL }
};
...
mntflags = mntaltflags = 0;
...
getmntopts(options, mopts, &mntflags, &mntaltflags);
...
.Ed
.Sh DIAGNOSTICS
If the external integer variable
.Va getmnt_silent
is zero, then the
.Fn getmntopts
function displays an error message and exits if an
unrecognized option is encountered.
Otherwise unrecognized options are silently ignored.
By default
.Va getmnt_silent
is zero.
.Sh SEE ALSO
.Xr err 3 ,
.Xr mount 8 ,
.Xr nmount 8
.Sh HISTORY
The
.Fn getmntopts
function appeared in
.Bx 4.4 .
The
.Fn build_iovec ,
.Fn build_iovec_argf ,
.Fn free_iovec ,
.Fn checkpath ,
and
.Fn rmslashes
functions were added with
.Xr nmount 8
in
.Fx 5.0 .
The
.Fn getmntpoint
and
.Fn chkdoreload
functions were added in
.Fx 14.0 .

2
sbin/mount/mntopts.h
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@ -104,6 +104,8 @@ void getmntopts(const char *, const struct mntopt *, int *, int *);
void rmslashes(char *, char *);
int checkpath(const char *, char resolved_path[]);
int checkpath_allow_file(const char *, char resolved_path[]);
struct statfs *getmntpoint(const char *);
int chkdoreload(struct statfs *, void (*)(const char *, ...) __printflike(1,2));
extern int getmnt_silent;
void build_iovec(struct iovec **iov, int *iovlen, const char *name, void *val, size_t len);
void build_iovec_argf(struct iovec **iov, int *iovlen, const char *name, const char *fmt, ...);

18
sbin/mount/mount.c
View File

@ -85,7 +85,6 @@ struct cpa {
};
char *catopt(char *, const char *);
struct statfs *getmntpt(const char *);
int hasopt(const char *, const char *);
int ismounted(struct fstab *, struct statfs *, int);
int isremountable(const char *);
@ -369,7 +368,7 @@ main(int argc, char *argv[])
if (init_flags & MNT_UPDATE) {
mntfromname = NULL;
have_fstab = 0;
if ((mntbuf = getmntpt(*argv)) == NULL)
if ((mntbuf = getmntpoint(*argv)) == NULL)
xo_errx(1, "not currently mounted %s", *argv);
/*
* Only get the mntflags from fstab if both mntpoint
@ -719,21 +718,6 @@ prmount(struct statfs *sfp)
xo_emit("{D:)}\n");
}
struct statfs *
getmntpt(const char *name)
{
struct statfs *mntbuf;
int i, mntsize;
mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
for (i = mntsize - 1; i >= 0; i--) {
if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
strcmp(mntbuf[i].f_mntonname, name) == 0)
return (&mntbuf[i]);
}
return (NULL);
}
char *
catopt(char *s0, const char *s1)
{

33
sbin/tunefs/tunefs.c
View File

@ -91,18 +91,14 @@ main(int argc, char *argv[])
{
const char *avalue, *jvalue, *Jvalue, *Lvalue, *lvalue, *Nvalue, *nvalue;
const char *tvalue;
const char *special, *on;
const char *special;
const char *name;
int active;
char *diskname;
int Aflag, aflag, eflag, evalue, fflag, fvalue, jflag, Jflag, kflag;
int kvalue, Lflag, lflag, mflag, mvalue, Nflag, nflag, oflag, ovalue;
int pflag, sflag, svalue, Svalue, tflag;
int ch, found_arg, i;
int iovlen = 0;
const char *chg[2];
struct statfs stfs;
struct iovec *iov = NULL;
char errmsg[255] = {0};
if (argc < 3)
usage();
@ -110,7 +106,6 @@ main(int argc, char *argv[])
lflag = mflag = Nflag = nflag = oflag = pflag = sflag = tflag = 0;
avalue = jvalue = Jvalue = Lvalue = lvalue = Nvalue = nvalue = NULL;
evalue = fvalue = mvalue = ovalue = svalue = Svalue = 0;
active = 0;
found_arg = 0; /* At least one arg is required. */
while ((ch = getopt(argc, argv, "Aa:e:f:j:J:k:L:l:m:N:n:o:ps:S:t:"))
!= -1)
@ -309,7 +304,7 @@ main(int argc, char *argv[])
if (found_arg == 0 || argc != 1)
usage();
on = special = argv[0];
special = argv[0];
if (ufs_disk_fillout(&disk, special) == -1)
goto err;
/*
@ -319,13 +314,6 @@ main(int argc, char *argv[])
(sblock.fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) != 0) &&
(found_arg > 1 || !pflag))
errx(1, "%s is not clean - run fsck.\n", special);
if (disk.d_name != special) {
if (statfs(special, &stfs) != 0)
warn("Can't stat %s", special);
if (strcmp(special, stfs.f_mntonname) == 0)
active = 1;
}
if (pflag) {
printfs();
exit(0);
@ -570,20 +558,9 @@ main(int argc, char *argv[])
if (sbwrite(&disk, Aflag) == -1)
goto err;
diskname = strdup(disk.d_name);
ufs_disk_close(&disk);
if (active) {
build_iovec_argf(&iov, &iovlen, "fstype", "ufs");
build_iovec_argf(&iov, &iovlen, "fspath", "%s", on);
build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
if (nmount(iov, iovlen,
stfs.f_flags | MNT_UPDATE | MNT_RELOAD) < 0) {
if (errmsg[0])
err(9, "%s: reload: %s", special, errmsg);
else
err(9, "%s: reload", special);
}
warnx("file system reloaded");
}
chkdoreload(getmntpoint(diskname), warnx);
exit(0);
err:
if (disk.d_error != NULL)