diff options
Diffstat (limited to 'e2fslib/ismounted.c')
-rw-r--r-- | e2fslib/ismounted.c | 261 |
1 files changed, 0 insertions, 261 deletions
diff --git a/e2fslib/ismounted.c b/e2fslib/ismounted.c deleted file mode 100644 index 1b145c6..0000000 --- a/e2fslib/ismounted.c +++ /dev/null @@ -1,261 +0,0 @@ -/* - * ismounted.c --- Check to see if the filesystem was mounted - * - * Copyright (C) 1995,1996,1997,1998,1999,2000 Theodore Ts'o. - * - * %Begin-Header% - * This file may be redistributed under the terms of the GNU Public - * License. - * %End-Header% - */ - -#include <stdio.h> -#if HAVE_UNISTD_H -#include <unistd.h> -#endif -#if HAVE_ERRNO_H -#include <errno.h> -#endif -#include <fcntl.h> -#ifdef HAVE_LINUX_FD_H -#include <linux/fd.h> -#endif -#ifdef HAVE_MNTENT_H -#include <mntent.h> -#endif -#ifdef HAVE_GETMNTINFO -#include <paths.h> -#include <sys/param.h> -#include <sys/mount.h> -#endif /* HAVE_GETMNTINFO */ -#include <string.h> -#include <sys/stat.h> - -#include "ext2_fs.h" -#include "ext2fs.h" - -#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 errcode_t check_mntent_file(const char *mtab_file, const char *file, - int *mount_flags, char *mtpt, int mtlen) -{ - struct mntent *mnt; - struct stat st_mntpnt, st_file; - errcode_t retval = 0; - FILE *f; - int fd; - - *mount_flags = 0; - if ((f = setmntent (mtab_file, "r")) == NULL) - return errno; - while ((mnt = getmntent (f)) != NULL) - if (strcmp(file, mnt->mnt_fsname) == 0) - break; - - 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 - * can't trust /etc/mtab, and /proc/mounts will only list - * /dev/root for the root filesystem. Argh. Instead we - * check if the given device has the same major/minor number - * as the device that the root directory is on. - */ - if (stat("/", &st_mntpnt) == 0 && stat(file, &st_file) == 0) { - if (st_mntpnt.st_dev == st_file.st_rdev) { - *mount_flags = EXT2_MF_MOUNTED; - if (mtpt) - strncpy(mtpt, "/", mtlen); - goto is_root; - } - } -#endif - goto exit; - } -#ifndef __GNU__ /* The GNU hurd is deficient; what else is new? */ - /* Validate the entry in case /etc/mtab is out of date */ - /* - * We need to be paranoid, because some broken distributions - * (read: Slackware) don't initialize /etc/mtab before checking - * all of the non-root filesystems on the disk. - */ - if (stat(mnt->mnt_dir, &st_mntpnt) < 0) { - retval = errno; - if (retval == ENOENT) { -#ifdef DEBUG - printf("Bogus entry in %s! (%s does not exist)\n", - mtab_file, mnt->mnt_dir); -#endif - retval = 0; - } - goto exit; - } - if (stat(file, &st_file) == 0) { - if (st_mntpnt.st_dev != st_file.st_rdev) { -#ifdef DEBUG - printf("Bogus entry in %s! (%s not mounted on %s)\n", - mtab_file, file, mnt->mnt_dir); -#endif - goto exit; - } - } -#endif - *mount_flags = EXT2_MF_MOUNTED; - - /* Check to see if the ro option is set */ - if (hasmntopt(mnt, MNTOPT_RO)) - *mount_flags |= EXT2_MF_READONLY; - - 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 |= EXT2_MF_ISROOT; - fd = open(TEST_FILE, O_RDWR|O_CREAT); - if (fd < 0) { - if (errno == EROFS) - *mount_flags |= EXT2_MF_READONLY; - } else - close(fd); - (void) unlink(TEST_FILE); - } - retval = 0; -exit: - endmntent (f); - return retval; -} - -static errcode_t check_mntent(const char *file, int *mount_flags, - char *mtpt, int mtlen) -{ - errcode_t retval; - -#ifdef DEBUG - retval = check_mntent_file("/tmp/mtab", file, mount_flags, - mtpt, mtlen); - if (retval == 0) - return 0; -#endif -#ifdef __linux__ - retval = check_mntent_file("/proc/mounts", file, mount_flags, - mtpt, mtlen); - if (retval == 0) - return 0; -#endif - retval = check_mntent_file(MOUNTED, file, mount_flags, mtpt, mtlen); - return retval; -} - -#elif defined(HAVE_GETMNTINFO) - -static errcode_t 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 = EXT2_MF_MOUNTED; - break; - } - ++mp; - } - if (mtpt) - strncpy(mtpt, mp->f_mntonname, mtlen); - return 0; -} -#endif /* HAVE_GETMNTINFO */ - -/* - * ext2fs_check_mount_point() returns 1 if the device is mounted, 0 - * otherwise. 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 -errcode_t ext2fs_check_mount_point(const char *device, int *mount_flags, - char *mtpt, int mtlen) -{ -#ifdef HAVE_MNTENT_H - return check_mntent(device, mount_flags, mtpt, mtlen); -#else -#ifdef HAVE_GETMNTINFO - return check_getmntinfo(device, mount_flags, mtpt, mtlen); -#else -#warning "Can't use getmntent or getmntinfo to check for mounted filesystems!" - *mount_flags = 0; - return 0; -#endif /* HAVE_GETMNTINFO */ -#endif /* HAVE_MNTENT_H */ -} - -/* - * ext2fs_check_if_mounted() sets the mount_flags EXT2_MF_MOUNTED, - * EXT2_MF_READONLY, and EXT2_MF_ROOT - * - */ -errcode_t ext2fs_check_if_mounted(const char *file, int *mount_flags) -{ - return ext2fs_check_mount_point(file, mount_flags, NULL, 0); -} - -#ifdef DEBUG -int main(int argc, char **argv) -{ - int retval, mount_flags; - - if (argc < 2) { - fprintf(stderr, "Usage: %s device\n", argv[0]); - exit(1); - } - - retval = ext2fs_check_if_mounted(argv[1], &mount_flags); - if (retval) { - com_err(argv[0], retval, - "while calling ext2fs_check_if_mounted"); - exit(1); - } - printf("Device %s reports flags %02x\n", argv[1], mount_flags); - if (mount_flags & EXT2_MF_MOUNTED) - printf("\t%s is mounted.\n", argv[1]); - - if (mount_flags & EXT2_MF_READONLY) - printf("\t%s is read-only.\n", argv[1]); - - if (mount_flags & EXT2_MF_ISROOT) - printf("\t%s is the root filesystem.\n", argv[1]); - - exit(0); -} -#endif |