lib: import whole ismounted.c code from e2fsprogs
Signed-off-by: Karel Zak <kzak@redhat.com>
This commit is contained in:
parent
2eefcaaace
commit
acf6ab6f67
|
@ -165,6 +165,7 @@ AC_CHECK_FUNCS(
|
|||
setresuid \
|
||||
inotify_init \
|
||||
prctl \
|
||||
getmntinfo \
|
||||
__secure_getenv \
|
||||
rpmatch])
|
||||
AC_FUNC_FSEEKO
|
||||
|
|
|
@ -1,6 +1,14 @@
|
|||
#ifndef IS_MOUNTED_H
|
||||
#define IS_MOUNTED_H
|
||||
|
||||
#define MF_MOUNTED 1
|
||||
#define MF_ISROOT 2
|
||||
#define MF_READONLY 4
|
||||
#define MF_SWAP 8
|
||||
#define MF_BUSY 16
|
||||
|
||||
extern int is_mounted(const char *file);
|
||||
extern int check_mount_point(const char *device, int *mount_flags,
|
||||
char *mtpt, int mtlen);
|
||||
|
||||
#endif /* IS_MOUNTED_H */
|
||||
|
|
304
lib/ismounted.c
304
lib/ismounted.c
|
@ -15,59 +15,27 @@
|
|||
#include <string.h>
|
||||
#include <sys/stat.h>
|
||||
#include <ctype.h>
|
||||
#include <sys/param.h>
|
||||
|
||||
#include "pathnames.h"
|
||||
#include "ismounted.h"
|
||||
|
||||
/*
|
||||
* ext2fs_check_if_mounted flags
|
||||
*/
|
||||
#define MF_MOUNTED 1
|
||||
|
||||
static char *skip_over_blank(char *cp)
|
||||
{
|
||||
while (*cp && isspace(*cp))
|
||||
cp++;
|
||||
return cp;
|
||||
}
|
||||
|
||||
static char *skip_over_word(char *cp)
|
||||
{
|
||||
while (*cp && !isspace(*cp))
|
||||
cp++;
|
||||
return cp;
|
||||
}
|
||||
|
||||
static char *parse_word(char **buf)
|
||||
{
|
||||
char *word, *next;
|
||||
|
||||
word = *buf;
|
||||
if (*word == 0)
|
||||
return 0;
|
||||
|
||||
word = skip_over_blank(word);
|
||||
next = skip_over_word(word);
|
||||
if (*next)
|
||||
*next++ = 0;
|
||||
*buf = next;
|
||||
return word;
|
||||
}
|
||||
|
||||
#ifdef HAVE_MNTENT_H
|
||||
/*
|
||||
* Helper function which checks a file in /etc/mtab format to see if a
|
||||
* filesystem is mounted. Returns an error if the file doesn't exist
|
||||
* or can't be opened.
|
||||
*/
|
||||
static int check_mntent_file(const char *mtab_file, const char *file,
|
||||
int *mount_flags)
|
||||
int *mount_flags, char *mtpt, int mtlen)
|
||||
{
|
||||
struct mntent *mnt;
|
||||
struct stat st_buf;
|
||||
int retval = 0;
|
||||
dev_t file_dev=0, file_rdev=0;
|
||||
ino_t file_ino=0;
|
||||
FILE *f;
|
||||
char buf[1024], *device = 0, *mnt_dir = 0, *cp;
|
||||
int fd;
|
||||
|
||||
*mount_flags = 0;
|
||||
if ((f = setmntent (mtab_file, "r")) == NULL)
|
||||
|
@ -82,25 +50,12 @@ static int check_mntent_file(const char *mtab_file, const char *file,
|
|||
file_ino = st_buf.st_ino;
|
||||
}
|
||||
}
|
||||
while (1) {
|
||||
if (!fgets(buf, sizeof(buf), f)) {
|
||||
device = mnt_dir = 0;
|
||||
break;
|
||||
}
|
||||
buf[sizeof(buf)-1] = 0;
|
||||
|
||||
cp = buf;
|
||||
device = parse_word(&cp);
|
||||
if (!device || *device == '#')
|
||||
return 0; /* Ignore blank lines and comments */
|
||||
mnt_dir = parse_word(&cp);
|
||||
|
||||
if (device[0] != '/')
|
||||
while ((mnt = getmntent (f)) != NULL) {
|
||||
if (mnt->mnt_fsname[0] != '/')
|
||||
continue;
|
||||
|
||||
if (strcmp(file, device) == 0)
|
||||
if (strcmp(file, mnt->mnt_fsname) == 0)
|
||||
break;
|
||||
if (stat(device, &st_buf) == 0) {
|
||||
if (stat(mnt->mnt_fsname, &st_buf) == 0) {
|
||||
if (S_ISBLK(st_buf.st_mode)) {
|
||||
#ifndef __GNU__
|
||||
if (file_rdev && (file_rdev == st_buf.st_rdev))
|
||||
|
@ -114,7 +69,7 @@ static int check_mntent_file(const char *mtab_file, const char *file,
|
|||
}
|
||||
}
|
||||
|
||||
if (mnt_dir == 0) {
|
||||
if (mnt == 0) {
|
||||
#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
|
||||
/*
|
||||
* Do an extra check to see if this is the root device. We
|
||||
|
@ -123,9 +78,13 @@ static int check_mntent_file(const char *mtab_file, const char *file,
|
|||
* check if the given device has the same major/minor number
|
||||
* as the device that the root directory is on.
|
||||
*/
|
||||
if (file_rdev && (stat("/", &st_buf) == 0) &&
|
||||
(st_buf.st_dev == file_rdev))
|
||||
if (file_rdev && stat("/", &st_buf) == 0 &&
|
||||
st_buf.st_dev == file_rdev) {
|
||||
*mount_flags = MF_MOUNTED;
|
||||
if (mtpt)
|
||||
strncpy(mtpt, "/", mtlen);
|
||||
goto is_root;
|
||||
}
|
||||
#endif /* __GNU__ */
|
||||
goto errout;
|
||||
}
|
||||
|
@ -136,12 +95,12 @@ static int check_mntent_file(const char *mtab_file, const char *file,
|
|||
* (read: Slackware) don't initialize /etc/mtab before checking
|
||||
* all of the non-root filesystems on the disk.
|
||||
*/
|
||||
if (stat(mnt_dir, &st_buf) < 0) {
|
||||
if (stat(mnt->mnt_dir, &st_buf) < 0) {
|
||||
retval = errno;
|
||||
if (retval == ENOENT) {
|
||||
#ifdef DEBUG
|
||||
printf("Bogus entry in %s! (%s does not exist)\n",
|
||||
mtab_file, mnt_dir);
|
||||
mtab_file, mnt->mnt_dir);
|
||||
#endif /* DEBUG */
|
||||
retval = 0;
|
||||
}
|
||||
|
@ -150,49 +109,252 @@ static int check_mntent_file(const char *mtab_file, const char *file,
|
|||
if (file_rdev && (st_buf.st_dev != file_rdev)) {
|
||||
#ifdef DEBUG
|
||||
printf("Bogus entry in %s! (%s not mounted on %s)\n",
|
||||
mtab_file, file, mnt_dir);
|
||||
mtab_file, file, mnt->mnt_dir);
|
||||
#endif /* DEBUG */
|
||||
goto errout;
|
||||
}
|
||||
#endif /* __GNU__ */
|
||||
*mount_flags = MF_MOUNTED;
|
||||
|
||||
#ifdef MNTOPT_RO
|
||||
/* Check to see if the ro option is set */
|
||||
if (hasmntopt(mnt, MNTOPT_RO))
|
||||
*mount_flags |= MF_READONLY;
|
||||
#endif
|
||||
|
||||
if (mtpt)
|
||||
strncpy(mtpt, mnt->mnt_dir, mtlen);
|
||||
/*
|
||||
* Check to see if we're referring to the root filesystem.
|
||||
* If so, do a manual check to see if we can open /etc/mtab
|
||||
* read/write, since if the root is mounted read/only, the
|
||||
* contents of /etc/mtab may not be accurate.
|
||||
*/
|
||||
if (!strcmp(mnt->mnt_dir, "/")) {
|
||||
is_root:
|
||||
#define TEST_FILE "/.ismount-test-file"
|
||||
*mount_flags |= MF_ISROOT;
|
||||
fd = open(TEST_FILE, O_RDWR|O_CREAT, 0600);
|
||||
if (fd < 0) {
|
||||
if (errno == EROFS)
|
||||
*mount_flags |= MF_READONLY;
|
||||
} else
|
||||
close(fd);
|
||||
(void) unlink(TEST_FILE);
|
||||
}
|
||||
retval = 0;
|
||||
errout:
|
||||
endmntent (f);
|
||||
return retval;
|
||||
}
|
||||
|
||||
static int check_mntent(const char *file, int *mount_flags,
|
||||
char *mtpt, int mtlen)
|
||||
{
|
||||
int retval;
|
||||
|
||||
#ifdef DEBUG
|
||||
retval = check_mntent_file("/tmp/mtab", file, mount_flags,
|
||||
mtpt, mtlen);
|
||||
if (retval == 0)
|
||||
return 0;
|
||||
#endif /* DEBUG */
|
||||
#ifdef __linux__
|
||||
retval = check_mntent_file("/proc/mounts", file, mount_flags,
|
||||
mtpt, mtlen);
|
||||
if (retval == 0 && (*mount_flags != 0))
|
||||
return 0;
|
||||
#endif /* __linux__ */
|
||||
#if defined(MOUNTED) || defined(_PATH_MOUNTED)
|
||||
#ifndef MOUNTED
|
||||
#define MOUNTED _PATH_MOUNTED
|
||||
#endif /* MOUNTED */
|
||||
retval = check_mntent_file(MOUNTED, file, mount_flags, mtpt, mtlen);
|
||||
return retval;
|
||||
#else
|
||||
*mount_flags = 0;
|
||||
return 0;
|
||||
#endif /* defined(MOUNTED) || defined(_PATH_MOUNTED) */
|
||||
}
|
||||
|
||||
#else
|
||||
#if defined(HAVE_GETMNTINFO)
|
||||
|
||||
static int check_getmntinfo(const char *file, int *mount_flags,
|
||||
char *mtpt, int mtlen)
|
||||
{
|
||||
struct statfs *mp;
|
||||
int len, n;
|
||||
const char *s1;
|
||||
char *s2;
|
||||
|
||||
n = getmntinfo(&mp, MNT_NOWAIT);
|
||||
if (n == 0)
|
||||
return errno;
|
||||
|
||||
len = sizeof(_PATH_DEV) - 1;
|
||||
s1 = file;
|
||||
if (strncmp(_PATH_DEV, s1, len) == 0)
|
||||
s1 += len;
|
||||
|
||||
*mount_flags = 0;
|
||||
while (--n >= 0) {
|
||||
s2 = mp->f_mntfromname;
|
||||
if (strncmp(_PATH_DEV, s2, len) == 0) {
|
||||
s2 += len - 1;
|
||||
*s2 = 'r';
|
||||
}
|
||||
if (strcmp(s1, s2) == 0 || strcmp(s1, &s2[1]) == 0) {
|
||||
*mount_flags = MF_MOUNTED;
|
||||
break;
|
||||
}
|
||||
++mp;
|
||||
}
|
||||
if (mtpt)
|
||||
strncpy(mtpt, mp->f_mntonname, mtlen);
|
||||
return 0;
|
||||
}
|
||||
#endif /* HAVE_GETMNTINFO */
|
||||
#endif /* HAVE_MNTENT_H */
|
||||
|
||||
/*
|
||||
* Check to see if we're dealing with the swap device.
|
||||
*/
|
||||
static int is_swap_device(const char *file)
|
||||
{
|
||||
FILE *f;
|
||||
char buf[1024], *cp;
|
||||
dev_t file_dev;
|
||||
struct stat st_buf;
|
||||
int ret = 0;
|
||||
|
||||
file_dev = 0;
|
||||
#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
|
||||
if ((stat(file, &st_buf) == 0) &&
|
||||
S_ISBLK(st_buf.st_mode))
|
||||
file_dev = st_buf.st_rdev;
|
||||
#endif /* __GNU__ */
|
||||
|
||||
if (!(f = fopen("/proc/swaps", "r")))
|
||||
return 0;
|
||||
/* Skip the first line */
|
||||
if (!fgets(buf, sizeof(buf), f))
|
||||
goto leave;
|
||||
if (*buf && strncmp(buf, "Filename\t", 9))
|
||||
/* Linux <=2.6.19 contained a bug in the /proc/swaps
|
||||
* code where the header would not be displayed
|
||||
*/
|
||||
goto valid_first_line;
|
||||
|
||||
while (fgets(buf, sizeof(buf), f)) {
|
||||
valid_first_line:
|
||||
if ((cp = strchr(buf, ' ')) != NULL)
|
||||
*cp = 0;
|
||||
if ((cp = strchr(buf, '\t')) != NULL)
|
||||
*cp = 0;
|
||||
if (strcmp(buf, file) == 0) {
|
||||
ret++;
|
||||
break;
|
||||
}
|
||||
#ifndef __GNU__
|
||||
if (file_dev && (stat(buf, &st_buf) == 0) &&
|
||||
S_ISBLK(st_buf.st_mode) &&
|
||||
file_dev == st_buf.st_rdev) {
|
||||
ret++;
|
||||
break;
|
||||
}
|
||||
#endif /* __GNU__ */
|
||||
}
|
||||
|
||||
leave:
|
||||
fclose(f);
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* check_mount_point() fills determines if the device is mounted or otherwise
|
||||
* busy, and fills in mount_flags with one or more of the following flags:
|
||||
* MF_MOUNTED, MF_ISROOT, MF_READONLY, MF_SWAP, and MF_BUSY. If mtpt is
|
||||
* non-NULL, the directory where the device is mounted is copied to where mtpt
|
||||
* is pointing, up to mtlen characters.
|
||||
*/
|
||||
#ifdef __TURBOC__
|
||||
#pragma argsused
|
||||
#endif
|
||||
int check_mount_point(const char *device, int *mount_flags,
|
||||
char *mtpt, int mtlen)
|
||||
{
|
||||
struct stat st_buf;
|
||||
int retval = 0;
|
||||
int fd;
|
||||
|
||||
if (is_swap_device(device)) {
|
||||
*mount_flags = MF_MOUNTED | MF_SWAP;
|
||||
strncpy(mtpt, "<swap>", mtlen);
|
||||
} else {
|
||||
#ifdef HAVE_MNTENT_H
|
||||
retval = check_mntent(device, mount_flags, mtpt, mtlen);
|
||||
#else
|
||||
#ifdef HAVE_GETMNTINFO
|
||||
retval = check_getmntinfo(device, mount_flags, mtpt, mtlen);
|
||||
#else
|
||||
#ifdef __GNUC__
|
||||
#warning "Can't use getmntent or getmntinfo to check for mounted filesystems!"
|
||||
#endif
|
||||
*mount_flags = 0;
|
||||
#endif /* HAVE_GETMNTINFO */
|
||||
#endif /* HAVE_MNTENT_H */
|
||||
}
|
||||
if (retval)
|
||||
return retval;
|
||||
|
||||
#ifdef __linux__ /* This only works on Linux 2.6+ systems */
|
||||
if ((stat(device, &st_buf) != 0) ||
|
||||
!S_ISBLK(st_buf.st_mode))
|
||||
return 0;
|
||||
fd = open(device, O_RDONLY | O_EXCL);
|
||||
if (fd < 0) {
|
||||
if (errno == EBUSY)
|
||||
*mount_flags |= MF_BUSY;
|
||||
} else
|
||||
close(fd);
|
||||
#endif
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int is_mounted(const char *file)
|
||||
{
|
||||
int retval;
|
||||
int mount_flags = 0;
|
||||
|
||||
#ifdef __linux__
|
||||
retval = check_mntent_file(_PATH_PROC_MOUNTS, file, &mount_flags);
|
||||
retval = check_mount_point(file, &mount_flags, NULL, 0);
|
||||
if (retval)
|
||||
return 0;
|
||||
if (mount_flags)
|
||||
return 1;
|
||||
#endif /* __linux__ */
|
||||
retval = check_mntent_file(_PATH_MOUNTED, file, &mount_flags);
|
||||
if (retval)
|
||||
return 0;
|
||||
return mount_flags;
|
||||
return mount_flags & MF_MOUNTED;
|
||||
}
|
||||
|
||||
#ifdef TEST_PROGRAM
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
int flags = 0;
|
||||
char devname[PATH_MAX];
|
||||
|
||||
if (argc < 2) {
|
||||
fprintf(stderr, "Usage: %s device\n", argv[0]);
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
|
||||
if (is_mounted(argv[1])) {
|
||||
printf("mounted\n");
|
||||
if (check_mount_point(argv[1], &flags, devname, sizeof(devname)) == 0 &&
|
||||
(flags & MF_MOUNTED)) {
|
||||
if (flags & MF_SWAP)
|
||||
printf("used swap device\n");
|
||||
else
|
||||
printf("mounted on %s\n", devname);
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
printf("not mounted\n");
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
|
|
Loading…
Reference in New Issue