static errcode_t check_mntent_file(const char *mtab_file, const char *file,
int *mount_flags, char *mtpt, int mtlen)
{
- FILE * f;
- struct mntent * mnt;
- int fd;
+ struct mntent *mnt;
+ struct stat st_buf;
+ errcode_t retval = 0;
+ dev_t file_dev=0, file_rdev=0;
+ ino_t file_ino=0;
+ FILE *f;
+ int fd;
*mount_flags = 0;
if ((f = setmntent (mtab_file, "r")) == NULL)
return errno;
- while ((mnt = getmntent (f)) != NULL)
+ if (stat(file, &st_buf) == 0) {
+ if (S_ISBLK(st_buf.st_mode)) {
+#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
+ file_rdev = st_buf.st_rdev;
+#endif /* __GNU__ */
+ } else {
+ file_dev = st_buf.st_dev;
+ file_ino = st_buf.st_ino;
+ }
+ }
+ while ((mnt = getmntent (f)) != NULL) {
if (strcmp(file, mnt->mnt_fsname) == 0)
break;
+ 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))
+ break;
+#endif /* __GNU__ */
+ } else {
+ if (file_dev && ((file_dev == st_buf.st_dev) &&
+ (file_ino == st_buf.st_ino)))
+ break;
+ }
+ }
+ }
if (mnt == 0) {
#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
- struct stat st_root, st_file;
/*
* Do an extra check to see if this is the root device. We
- * can't trust /etc/fstab, and /proc/mounts will only list
+ * 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_root) == 0 && stat(file, &st_file) == 0) {
- if (st_root.st_dev == st_file.st_rdev) {
+ if (file_rdev && stat("/", &st_buf) == 0) {
+ if (st_buf.st_dev == file_rdev) {
*mount_flags = EXT2_MF_MOUNTED;
if (mtpt)
strncpy(mtpt, "/", mtlen);
goto is_root;
}
}
-#endif
- endmntent (f);
- return 0;
+#endif /* __GNU__ */
+ goto errout;
}
+#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+ /* Validate the entry in case /etc/mtab is out of date */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_buf) < 0) {
+ retval = errno;
+ if (retval == ENOENT) {
+#ifdef DEBUG
+ printf("Bogus entry in %s! (%s does not exist)\n",
+ mtab_file, mnt->mnt_dir);
+#endif /* DEBUG */
+ retval = 0;
+ }
+ goto errout;
+ }
+ 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->mnt_dir);
+#endif /* DEBUG */
+ goto errout;
+ }
+#endif /* __GNU__ */
*mount_flags = EXT2_MF_MOUNTED;
+#ifdef MNTOPT_RO
/* Check to see if the ro option is set */
if (hasmntopt(mnt, MNTOPT_RO))
*mount_flags |= EXT2_MF_READONLY;
+#endif
if (mtpt)
strncpy(mtpt, mnt->mnt_dir, mtlen);
close(fd);
(void) unlink(TEST_FILE);
}
+ retval = 0;
+errout:
endmntent (f);
- return 0;
+ return retval;
}
static errcode_t check_mntent(const char *file, int *mount_flags,
{
errcode_t 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)
+ if (retval == 0 && (*mount_flags != 0))
return 0;
-#endif
+#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) */
}
-#elif defined(HAVE_GETMNTINFO)
+#else
+#if defined(HAVE_GETMNTINFO)
static errcode_t check_getmntinfo(const char *file, int *mount_flags,
char *mtpt, int 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 */
+ fgets(buf, sizeof(buf), f);
+ while (!feof(f)) {
+ if (!fgets(buf, sizeof(buf), f))
+ break;
+ 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__ */
+ }
+ fclose(f);
+ return ret;
+}
+
/*
- * 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.
+ * ext2fs_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: EXT2_MF_MOUNTED, EXT2_MF_ISROOT,
+ * EXT2_MF_READONLY, EXT2_MF_SWAP, and EXT2_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
errcode_t ext2fs_check_mount_point(const char *device, int *mount_flags,
char *mtpt, int mtlen)
{
+ struct stat st_buf;
+ errcode_t retval = 0;
+ int fd;
+
+ if (is_swap_device(device)) {
+ *mount_flags = EXT2_MF_MOUNTED | EXT2_MF_SWAP;
+ strncpy(mtpt, "<swap>", mtlen);
+ } else {
#ifdef HAVE_MNTENT_H
- return check_mntent(device, mount_flags, mtpt, mtlen);
+ retval = check_mntent(device, mount_flags, mtpt, mtlen);
#else
#ifdef HAVE_GETMNTINFO
- return check_getmntinfo(device, mount_flags, mtpt, mtlen);
+ retval = 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;
+#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 |= EXT2_MF_BUSY;
+ } else
+ close(fd);
+
+ return 0;
+#endif
}
/*
int main(int argc, char **argv)
{
int retval, mount_flags;
+ char mntpt[80];
if (argc < 2) {
fprintf(stderr, "Usage: %s device\n", argv[0]);
exit(1);
}
- retval = ext2fs_check_if_mounted(argv[1], &mount_flags);
+ mntpt[0] = 0;
+ retval = ext2fs_check_mount_point(argv[1], &mount_flags,
+ mntpt, sizeof(mntpt));
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_BUSY)
+ printf("\t%s is apparently in use.\n", argv[1]);
if (mount_flags & EXT2_MF_MOUNTED)
printf("\t%s is mounted.\n", argv[1]);
-
+ if (mount_flags & EXT2_MF_SWAP)
+ printf("\t%s is a swap device.\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]);
-
+ if (mntpt[0])
+ printf("\t%s is mounted on %s.\n", argv[1], mntpt);
exit(0);
}
-#endif
+#endif /* DEBUG */
git://git.whamcloud.com / tools / e2fsprogs.git / blobdiff