/*
* 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.
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
* %End-Header%
*/
+#include "config.h"
#include <stdio.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#include "ext2_fs.h"
#include "ext2fs.h"
-#ifdef HAVE_MNTENT_H
+#ifdef HAVE_SETMNTENT
/*
* 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.
+ * or can't be opened.
*/
-static errcode_t check_mntent_file(const char *mtab_file, const char *file,
+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_buf;
errcode_t retval = 0;
- dev_t file_dev;
+ 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;
- file_dev = 0;
+ return (errno == ENOENT ? EXT2_NO_MTAB_FILE : errno);
+ 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 */
- if (stat(file, &st_buf) == 0)
- file_dev = st_buf.st_rdev;
-#endif
+ 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 (mnt->mnt_fsname[0] != '/')
+ continue;
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_dev && (stat(mnt->mnt_fsname, &st_buf) == 0) &&
- file_dev == st_buf.st_rdev)
- break;
-#endif
+ 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) {
* check if the given device has the same major/minor number
* as the device that the root directory is on.
*/
- if (file_dev && stat("/", &st_buf) == 0) {
- if (st_buf.st_dev == file_dev) {
+ 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
- goto exit;
+#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.
#ifdef DEBUG
printf("Bogus entry in %s! (%s does not exist)\n",
mtab_file, mnt->mnt_dir);
-#endif
+#endif /* DEBUG */
retval = 0;
}
- goto exit;
+ goto errout;
}
- if (file_dev && (st_buf.st_dev != file_dev)) {
+ 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
- goto exit;
+#endif /* DEBUG */
+ goto errout;
}
-#endif
+#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);
*/
if (!strcmp(mnt->mnt_dir, "/")) {
is_root:
-#define TEST_FILE "/.ismount-test-file"
+#define TEST_FILE "/.ismount-test-file"
*mount_flags |= EXT2_MF_ISROOT;
- fd = open(TEST_FILE, O_RDWR|O_CREAT);
+ fd = open(TEST_FILE, O_RDWR|O_CREAT, 0600);
if (fd < 0) {
if (errno == EROFS)
*mount_flags |= EXT2_MF_READONLY;
(void) unlink(TEST_FILE);
}
retval = 0;
-exit:
+errout:
endmntent (f);
return retval;
}
-/*
- * 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;
-
- file_dev = 0;
-#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
- if (stat(file, &st_buf) == 0)
- file_dev = st_buf.st_rdev;
-#endif
-
- f = fopen("/proc/swaps", "r");
- if (!f)
- 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)
- return 1;
-#ifndef __GNU__
- if (file_dev && (stat(buf, &st_buf) == 0) &&
- file_dev == st_buf.st_rdev)
- return 1;
-#endif
- }
- return 0;
-}
-
static errcode_t check_mntent(const char *file, int *mount_flags,
char *mtpt, int mtlen)
{
mtpt, mtlen);
if (retval == 0)
return 0;
-#endif
+#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)
s1 = file;
if (strncmp(_PATH_DEV, s1, len) == 0)
s1 += len;
-
+
*mount_flags = 0;
while (--n >= 0) {
s2 = mp->f_mntfromname;
return 0;
}
#endif /* HAVE_GETMNTINFO */
+#endif /* HAVE_SETMNTENT */
/*
- * 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.
+ * 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;
+}
+
+
+/*
+ * 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);
- return 0;
- }
-#ifdef HAVE_MNTENT_H
- return check_mntent(device, mount_flags, mtpt, mtlen);
-#else
+ } else {
+#ifdef HAVE_SETMNTENT
+ 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 */
+#endif /* HAVE_SETMNTENT */
+ }
+ 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);
+#endif
+
+ return 0;
}
/*
* 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)
{
{
int retval, mount_flags;
char mntpt[80];
-
+
if (argc < 2) {
fprintf(stderr, "Usage: %s device\n", argv[0]);
exit(1);
}
+ add_error_table(&et_ext2_error_table);
mntpt[0] = 0;
retval = ext2fs_check_mount_point(argv[1], &mount_flags,
mntpt, sizeof(mntpt));
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