660 lines
18 KiB
C
660 lines
18 KiB
C
/*
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* Thu Jul 14 07:32:40 1994: faith@cs.unc.edu added changes from Adam
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* J. Richter (adam@adam.yggdrasil.com) so that /proc/filesystems is used
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* if no -t option is given. I modified his patches so that, if
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* /proc/filesystems is not available, the behavior of mount is the same as
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* it was previously.
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*
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* Wed Feb 8 09:23:18 1995: Mike Grupenhoff <kashmir@umiacs.UMD.EDU> added
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* a probe of the superblock for the type before /proc/filesystems is
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* checked.
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*
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* Fri Apr 5 01:13:33 1996: quinlan@bucknell.edu, fixed up iso9660 autodetect
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*
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* Wed Nov 11 11:33:55 1998: K.Garloff@ping.de, try /etc/filesystems before
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* /proc/filesystems
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* [This was mainly in order to specify vfat before fat; these days we often
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* detect *fat and then assume vfat, so perhaps /etc/filesystems isnt
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* so useful anymore.]
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*
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* 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
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* added Native Language Support
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*
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* 2000-12-01 Sepp Wijnands <mrrazz@garbage-coderz.net>
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* added probes for cramfs, hfs, hpfs and adfs.
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*
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* 2001-10-26 Tim Launchbury
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* added sysv magic.
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*
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* aeb - many changes.
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "linux_fs.h"
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#include "mount_blkid.h"
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#include "mount_guess_fstype.h"
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#include "sundries.h" /* for xstrdup */
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#include "nls.h"
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#define ETC_FILESYSTEMS "/etc/filesystems"
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#define PROC_FILESYSTEMS "/proc/filesystems"
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#ifdef HAVE_BLKID
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char *
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do_guess_fstype(const char *device)
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{
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return blkid_get_tag_value(blkid, "TYPE", device);
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}
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static int
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known_fstype(const char *fstype)
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{
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return blkid_known_fstype(fstype);
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}
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#else
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#define SIZE(a) (sizeof(a)/sizeof(a[0]))
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/* Most file system types can be recognized by a `magic' number
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in the superblock. Note that the order of the tests is
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significant: by coincidence a filesystem can have the
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magic numbers for several file system types simultaneously.
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For example, the romfs magic lives in the 1st sector;
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xiafs does not touch the 1st sector and has its magic in
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the 2nd sector; ext2 does not touch the first two sectors. */
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static inline unsigned short
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swapped(unsigned short a) {
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return (a>>8) | (a<<8);
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}
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/*
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char *guess_fstype(const char *device);
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Probes the device and attempts to determine the type of filesystem
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contained within.
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Original routine by <jmorriso@bogomips.ww.ubc.ca>; made into a function
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for mount(8) by Mike Grupenhoff <kashmir@umiacs.umd.edu>.
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Corrected the test for xiafs - aeb
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Read the superblock only once - aeb
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Added a very weak heuristic for vfat - aeb
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Added efs, iso9660, minix-v2, romfs, qnx4, udf, vxfs, swap - aeb
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Added a test for high sierra (iso9660) - quinlan@bucknell.edu
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Added ufs from a patch by jj. But maybe there are several types of ufs?
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Added ntfs from a patch by Richard Russon.
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Added xfs - 2000-03-21 Martin K. Petersen <mkp@linuxcare.com>
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Added cramfs, hfs, hpfs, adfs - Sepp Wijnands <mrrazz@garbage-coderz.net>
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Added ext3 - Andrew Morton
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Added jfs - Christoph Hellwig
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Added sysv - Tim Launchbury
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Added udf - Bryce Nesbitt
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Added ocfs, ocfs2 - Manish Singh - http://oss.oracle.com/projects/ocfs2/
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*/
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static char
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*magic_known[] = {
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"adfs", "bfs", "cramfs", "efs", "ext", "ext2", "ext3",
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"hfs", "hpfs", "iso9660", "jfs", "minix", "ntfs", "ocfs", "ocfs2",
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"qnx4", "reiserfs", "romfs", "swap", "sysv", "udf", "ufs",
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"vxfs", "xfs", "xiafs"
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};
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static int
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known_fstype(const char *fstype) {
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char **m;
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for (m = magic_known; m - magic_known < SIZE(magic_known); m++)
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if (!strcmp(*m, fstype))
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return 1;
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return 0;
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}
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/*
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* udf magic - I find that trying to mount garbage as an udf fs
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* causes a very large kernel delay, almost killing the machine.
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* So, we do not try udf unless there is positive evidence that it
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* might work. Strings below taken from ECMA 167.
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*/
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/*
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* It seems that before udf 2.00 the volume descriptor was not well
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* defined. For 2.00 you're supposed to keep scanning records until
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* you find one NOT in this list. (See ECMA 2/8.3.1).
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*/
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static char
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*udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02",
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"NSR03", "TEA01" };
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static int
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may_be_udf(const char *id) {
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char **m;
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for (m = udf_magic; m - udf_magic < SIZE(udf_magic); m++)
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if (!strncmp(*m, id, 5))
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return 1;
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return 0;
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}
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/* we saw "CD001" - may be iso9660 or udf - Bryce Nesbitt */
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static int
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is_really_udf(int fd) {
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int j, bs;
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struct iso_volume_descriptor isosb;
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/* determine the block size by scanning in 2K increments
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(block sizes larger than 2K will be null padded) */
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for (bs = 1; bs < 16; bs++) {
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lseek(fd, bs*2048+32768, SEEK_SET);
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if (read(fd, (char *)&isosb, sizeof(isosb)) != sizeof(isosb))
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return 0;
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if (isosb.id[0])
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break;
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}
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/* Scan up to another 64 blocks looking for additional VSD's */
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for (j = 1; j < 64; j++) {
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if (j > 1) {
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lseek(fd, j*bs*2048+32768, SEEK_SET);
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if (read(fd, (char *)&isosb, sizeof(isosb))
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!= sizeof(isosb))
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return 0;
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}
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/* If we find NSR0x then call it udf:
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NSR01 for UDF 1.00
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NSR02 for UDF 1.50
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NSR03 for UDF 2.00 */
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if (!strncmp(isosb.id, "NSR0", 4))
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return 1;
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if (!may_be_udf(isosb.id))
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return 0;
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}
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return 0;
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}
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static int
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may_be_swap(const char *s) {
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return (strncmp(s-10, "SWAP-SPACE", 10) == 0 ||
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strncmp(s-10, "SWAPSPACE2", 10) == 0);
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}
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/* rather weak necessary condition */
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static int
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may_be_adfs(const u_char *s) {
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u_char *p;
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int sum;
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p = (u_char *) s + 511;
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sum = 0;
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while (--p != s)
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sum = (sum >> 8) + (sum & 0xff) + *p;
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return (sum == p[511]);
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}
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char *
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do_guess_fstype(const char *device) {
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int fd;
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char *type = NULL;
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union {
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struct xiafs_super_block xiasb;
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char romfs_magic[8];
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char qnx4fs_magic[10]; /* ignore first 4 bytes */
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long bfs_magic;
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struct ntfs_super_block ntfssb;
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struct fat_super_block fatsb;
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struct xfs_super_block xfsb;
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struct cramfs_super_block cramfssb;
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struct ocfs_volume_header ovh;
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struct efs_volume_header efsvh;
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struct efs_super efssb;
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} xsb; /* stuff at 0 */
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union {
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struct minix_super_block ms;
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struct ext_super_block es;
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struct ext2_super_block e2s;
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struct vxfs_super_block vs;
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} sb; /* stuff at 1024 */
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struct ufs_super_block ufssb;
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union {
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struct iso_volume_descriptor iso;
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struct hs_volume_descriptor hs;
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} isosb;
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struct reiserfs_super_block reiserfssb; /* block 64 or 8 */
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struct jfs_super_block jfssb; /* block 32 */
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struct hfs_super_block hfssb;
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struct hpfs_super_block hpfssb;
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struct adfs_super_block adfssb;
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struct sysv_super_block svsb;
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struct ocfs2_super_block osb;
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struct stat statbuf;
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/* opening and reading an arbitrary unknown path can have
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undesired side effects - first check that `device' refers
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to a block device or ordinary file */
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if (stat (device, &statbuf) ||
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!(S_ISBLK(statbuf.st_mode) || S_ISREG(statbuf.st_mode)))
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return 0;
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fd = open(device, O_RDONLY);
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if (fd < 0)
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return 0;
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/* do seeks and reads in disk order, otherwise a very short
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partition may cause a failure because of read error */
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if (!type) {
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/* block 0 */
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if (lseek(fd, 0, SEEK_SET) != 0
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|| read(fd, (char *) &xsb, sizeof(xsb)) != sizeof(xsb))
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goto try_iso9660;
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/* Gyorgy Kovesdi: none of my photocds has a readable block 0 */
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if (xiafsmagic(xsb.xiasb) == _XIAFS_SUPER_MAGIC)
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type = "xiafs";
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else if(!strncmp(xsb.romfs_magic, "-rom1fs-", 8))
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type = "romfs";
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else if(!strncmp(xsb.xfsb.s_magic, XFS_SUPER_MAGIC, 4))
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type = "xfs";
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else if(!strncmp(xsb.ovh.signature, OCFS_MAGIC, sizeof(OCFS_MAGIC)))
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type = "ocfs";
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else if(!strncmp(xsb.qnx4fs_magic+4, "QNX4FS", 6))
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type = "qnx4";
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else if(xsb.bfs_magic == 0x1badface)
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type = "bfs";
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else if(!strncmp(xsb.ntfssb.s_magic, NTFS_SUPER_MAGIC,
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sizeof(xsb.ntfssb.s_magic)))
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type = "ntfs";
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else if(cramfsmagic(xsb.cramfssb) == CRAMFS_SUPER_MAGIC ||
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cramfsmagic(xsb.cramfssb) == CRAMFS_SUPER_MAGIC_BE)
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type = "cramfs";
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else if (assemble4be(xsb.efsvh.vh_magic) == EFS_VHMAGIC)
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type = "efs"; /* EFS volume header */
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/* might check checksum here */
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else if (assemble4be(xsb.efssb.fs_magic) == EFS_SBMAGIC ||
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assemble4be(xsb.efssb.fs_magic) == EFS_SBMAGIC2)
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type = "efs"; /* EFS partition */
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else if ((!strncmp(xsb.fatsb.s_os, "MSDOS", 5) ||
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!strncmp(xsb.fatsb.s_os, "MSWIN", 5) ||
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!strncmp(xsb.fatsb.s_os, "MTOOL", 5) ||
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!strncmp(xsb.fatsb.s_os, "IBM", 3) ||
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!strncmp(xsb.fatsb.s_os, "DRDOS", 5) ||
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!strncmp(xsb.fatsb.s_os, "mkdosfs", 7) ||
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!strncmp(xsb.fatsb.s_os, "kmkdosfs", 8) ||
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/* Michal Svec: created by fdformat, old msdos utility for
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formatting large (1.7) floppy disks. */
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!strncmp(xsb.fatsb.s_os, "CH-FOR18", 8))
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&& (!strncmp(xsb.fatsb.s_fs, "FAT12 ", 8) ||
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!strncmp(xsb.fatsb.s_fs, "FAT16 ", 8) ||
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!strncmp(xsb.fatsb.s_fs2, "FAT32 ", 8)))
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type = "vfat"; /* only guessing - might as well be fat or umsdos */
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}
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if (!type) {
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/* sector 1 */
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if (lseek(fd, 512 , SEEK_SET) != 512
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|| read(fd, (char *) &svsb, sizeof(svsb)) != sizeof(svsb))
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goto io_error;
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if (sysvmagic(svsb) == SYSV_SUPER_MAGIC )
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type = "sysv";
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}
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if (!type) {
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/* block 1 */
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if (lseek(fd, 1024, SEEK_SET) != 1024 ||
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read(fd, (char *) &sb, sizeof(sb)) != sizeof(sb))
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goto io_error;
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/* ext2 has magic in little-endian on disk, so "swapped" is
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superfluous; however, there have existed strange byteswapped
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PPC ext2 systems */
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if (ext2magic(sb.e2s) == EXT2_SUPER_MAGIC ||
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ext2magic(sb.e2s) == EXT2_PRE_02B_MAGIC ||
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ext2magic(sb.e2s) == swapped(EXT2_SUPER_MAGIC)) {
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type = "ext2";
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/* maybe even ext3? */
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if ((assemble4le(sb.e2s.s_feature_compat)
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& EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
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assemble4le(sb.e2s.s_journal_inum) != 0)
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type = "ext3"; /* "ext3,ext2" */
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}
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else if (minixmagic(sb.ms) == MINIX_SUPER_MAGIC ||
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minixmagic(sb.ms) == MINIX_SUPER_MAGIC2 ||
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minixmagic(sb.ms) == swapped(MINIX_SUPER_MAGIC2) ||
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minixmagic(sb.ms) == MINIX2_SUPER_MAGIC ||
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minixmagic(sb.ms) == MINIX2_SUPER_MAGIC2)
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type = "minix";
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else if (extmagic(sb.es) == EXT_SUPER_MAGIC)
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type = "ext";
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else if (vxfsmagic(sb.vs) == VXFS_SUPER_MAGIC)
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type = "vxfs";
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}
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if (!type) {
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/* block 1 */
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if (lseek(fd, 0x400, SEEK_SET) != 0x400
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|| read(fd, (char *) &hfssb, sizeof(hfssb)) != sizeof(hfssb))
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goto io_error;
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/* also check if block size is equal to 512 bytes,
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or a multiple. (I see 1536 here.) */
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if (hfsmagic(hfssb) == HFS_SUPER_MAGIC && /* always BE */
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hfsblksize(hfssb) != 0 &&
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(hfsblksize(hfssb) & 0x1ff) == 0)
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type = "hfs";
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}
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if (!type) {
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/* block 3 */
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if (lseek(fd, 0xc00, SEEK_SET) != 0xc00
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|| read(fd, (char *) &adfssb, sizeof(adfssb)) != sizeof(adfssb))
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goto io_error;
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/* only a weak test */
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if (may_be_adfs((u_char *) &adfssb)
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&& (adfsblksize(adfssb) >= 8 &&
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adfsblksize(adfssb) <= 10))
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type = "adfs";
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}
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if (!type) {
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int mag;
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/* block 8 */
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if (lseek(fd, 8192, SEEK_SET) != 8192
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|| read(fd, (char *) &ufssb, sizeof(ufssb)) != sizeof(ufssb))
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goto io_error;
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mag = ufsmagic(ufssb);
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if (mag == UFS_SUPER_MAGIC_LE || mag == UFS_SUPER_MAGIC_BE)
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type = "ufs";
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}
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if (!type) {
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/* block 8 */
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if (lseek(fd, REISERFS_OLD_DISK_OFFSET_IN_BYTES, SEEK_SET) !=
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REISERFS_OLD_DISK_OFFSET_IN_BYTES
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|| read(fd, (char *) &reiserfssb, sizeof(reiserfssb)) !=
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sizeof(reiserfssb))
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goto io_error;
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if (reiserfs_magic_version(reiserfssb.s_magic))
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type = "reiserfs";
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}
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if (!type) {
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/* block 8 */
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if (lseek(fd, 0x2000, SEEK_SET) != 0x2000
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|| read(fd, (char *) &hpfssb, sizeof(hpfssb)) != sizeof(hpfssb))
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goto io_error;
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if (hpfsmagic(hpfssb) == HPFS_SUPER_MAGIC)
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type = "hpfs";
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}
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if (!type) {
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/* block 32 */
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if (lseek(fd, JFS_SUPER1_OFF, SEEK_SET) != JFS_SUPER1_OFF
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|| read(fd, (char *) &jfssb, sizeof(jfssb)) != sizeof(jfssb))
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goto io_error;
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if (!strncmp(jfssb.s_magic, JFS_MAGIC, 4))
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type = "jfs";
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}
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if (!type) {
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/* block 32 */
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try_iso9660:
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if (lseek(fd, 0x8000, SEEK_SET) != 0x8000
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|| read(fd, (char *) &isosb, sizeof(isosb)) != sizeof(isosb))
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goto io_error;
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if (strncmp(isosb.hs.id, HS_STANDARD_ID, sizeof(isosb.hs.id)) == 0) {
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/* "CDROM" */
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type = "iso9660";
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} else if (strncmp(isosb.iso.id, ISO_STANDARD_ID,
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sizeof(isosb.iso.id)) == 0) {
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/* CD001 */
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type = "iso9660";
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if (is_really_udf(fd))
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type = "udf";
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} else if (may_be_udf(isosb.iso.id))
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type = "udf";
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}
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if (!type) {
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/* block 64 */
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if (lseek(fd, REISERFS_DISK_OFFSET_IN_BYTES, SEEK_SET) !=
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REISERFS_DISK_OFFSET_IN_BYTES
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|| read(fd, (char *) &reiserfssb, sizeof(reiserfssb)) !=
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sizeof(reiserfssb))
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goto io_error;
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if (reiserfs_magic_version(reiserfssb.s_magic))
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type = "reiserfs";
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}
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if (!type) {
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int blksize, blkoff;
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for (blksize = OCFS2_MIN_BLOCKSIZE;
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blksize <= OCFS2_MAX_BLOCKSIZE;
|
|
blksize <<= 1) {
|
|
blkoff = blksize * OCFS2_SUPER_BLOCK_BLKNO;
|
|
if (lseek(fd, blkoff, SEEK_SET) != blkoff
|
|
|| read(fd, (char *) &osb, sizeof(osb)) != sizeof(osb))
|
|
goto io_error;
|
|
if (strncmp(osb.signature, OCFS2_SUPER_BLOCK_SIGNATURE,
|
|
sizeof(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0)
|
|
type = "ocfs2";
|
|
}
|
|
}
|
|
|
|
if (!type) {
|
|
/* perhaps the user tries to mount the swap space
|
|
on a new disk; warn her before she does mke2fs on it */
|
|
int pagesize = getpagesize();
|
|
int rd;
|
|
char buf[32768];
|
|
|
|
rd = pagesize;
|
|
if (rd < 8192)
|
|
rd = 8192;
|
|
if (rd > sizeof(buf))
|
|
rd = sizeof(buf);
|
|
if (lseek(fd, 0, SEEK_SET) != 0
|
|
|| read(fd, buf, rd) != rd)
|
|
goto io_error;
|
|
if (may_be_swap(buf+pagesize) ||
|
|
may_be_swap(buf+4096) || may_be_swap(buf+8192))
|
|
type = "swap";
|
|
}
|
|
|
|
close (fd);
|
|
return(type);
|
|
|
|
io_error:
|
|
if (errno)
|
|
perror(device);
|
|
else
|
|
fprintf(stderr, _("mount: error while guessing filesystem type\n"));
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
static struct tried {
|
|
struct tried *next;
|
|
char *type;
|
|
} *tried = NULL;
|
|
|
|
static int
|
|
was_tested(const char *fstype) {
|
|
struct tried *t;
|
|
|
|
if (known_fstype(fstype))
|
|
return 1;
|
|
for (t = tried; t; t = t->next) {
|
|
if (!strcmp(t->type, fstype))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
set_tested(const char *fstype) {
|
|
struct tried *t = xmalloc(sizeof(struct tried));
|
|
|
|
t->next = tried;
|
|
t->type = xstrdup(fstype);
|
|
tried = t;
|
|
}
|
|
|
|
static void
|
|
free_tested(void) {
|
|
struct tried *t, *tt;
|
|
|
|
t = tried;
|
|
while(t) {
|
|
free(t->type);
|
|
tt = t->next;
|
|
free(t);
|
|
t = tt;
|
|
}
|
|
tried = NULL;
|
|
}
|
|
|
|
char *
|
|
guess_fstype(const char *spec) {
|
|
char *type = do_guess_fstype(spec);
|
|
if (verbose) {
|
|
printf (_("mount: you didn't specify a filesystem type for %s\n"),
|
|
spec);
|
|
if (!type)
|
|
printf (_(" I will try all types mentioned in %s or %s\n"),
|
|
ETC_FILESYSTEMS, PROC_FILESYSTEMS);
|
|
else if (!strcmp(type, "swap"))
|
|
printf (_(" and it looks like this is swapspace\n"));
|
|
else
|
|
printf (_(" I will try type %s\n"), type);
|
|
}
|
|
return type;
|
|
}
|
|
|
|
static char *
|
|
procfsnext(FILE *procfs) {
|
|
char line[100];
|
|
char fsname[100];
|
|
|
|
while (fgets(line, sizeof(line), procfs)) {
|
|
if (sscanf (line, "nodev %[^\n]\n", fsname) == 1) continue;
|
|
if (sscanf (line, " %[^ \n]\n", fsname) != 1) continue;
|
|
return xstrdup(fsname);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Only use /proc/filesystems here, this is meant to test what
|
|
the kernel knows about, so /etc/filesystems is irrelevant.
|
|
Return: 1: yes, 0: no, -1: cannot open procfs */
|
|
int
|
|
is_in_procfs(const char *type) {
|
|
FILE *procfs;
|
|
char *fsname;
|
|
int ret = -1;
|
|
|
|
procfs = fopen(PROC_FILESYSTEMS, "r");
|
|
if (procfs) {
|
|
ret = 0;
|
|
while ((fsname = procfsnext(procfs)) != NULL)
|
|
if (!strcmp(fsname, type)) {
|
|
ret = 1;
|
|
break;
|
|
}
|
|
fclose(procfs);
|
|
procfs = NULL;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* Try all types in FILESYSTEMS, except those in *types,
|
|
in case *types starts with "no" */
|
|
/* return: 0: OK, -1: error in errno, 1: type not found */
|
|
/* when 0 or -1 is returned, *types contains the type used */
|
|
/* when 1 is returned, *types is NULL */
|
|
int
|
|
procfsloop(int (*mount_fn)(struct mountargs *), struct mountargs *args,
|
|
const char **types) {
|
|
char *files[2] = { ETC_FILESYSTEMS, PROC_FILESYSTEMS };
|
|
FILE *procfs;
|
|
char *fsname;
|
|
const char *notypes = NULL;
|
|
int no = 0;
|
|
int ret = 1;
|
|
int errsv = 0;
|
|
int i;
|
|
|
|
if (*types && !strncmp(*types, "no", 2)) {
|
|
no = 1;
|
|
notypes = (*types) + 2;
|
|
}
|
|
*types = NULL;
|
|
|
|
/* Use PROC_FILESYSTEMS only when ETC_FILESYSTEMS does not exist.
|
|
In some cases trying a filesystem that the kernel knows about
|
|
on the wrong data will crash the kernel; in such cases
|
|
ETC_FILESYSTEMS can be used to list the filesystems that we
|
|
are allowed to try, and in the order they should be tried.
|
|
End ETC_FILESYSTEMS with a line containing a single '*' only,
|
|
if PROC_FILESYSTEMS should be tried afterwards. */
|
|
|
|
for (i=0; i<2; i++) {
|
|
procfs = fopen(files[i], "r");
|
|
if (!procfs)
|
|
continue;
|
|
while ((fsname = procfsnext(procfs)) != NULL) {
|
|
if (!strcmp(fsname, "*")) {
|
|
fclose(procfs);
|
|
goto nexti;
|
|
}
|
|
if (was_tested (fsname))
|
|
continue;
|
|
if (no && matching_type(fsname, notypes))
|
|
continue;
|
|
set_tested (fsname);
|
|
args->type = fsname;
|
|
if (verbose) {
|
|
printf(_("Trying %s\n"), fsname);
|
|
fflush(stdout);
|
|
}
|
|
if ((*mount_fn) (args) == 0) {
|
|
*types = fsname;
|
|
ret = 0;
|
|
break;
|
|
} else if (errno != EINVAL &&
|
|
is_in_procfs(fsname) == 1) {
|
|
*types = "guess";
|
|
ret = -1;
|
|
errsv = errno;
|
|
break;
|
|
}
|
|
}
|
|
free_tested();
|
|
fclose(procfs);
|
|
errno = errsv;
|
|
return ret;
|
|
nexti:;
|
|
}
|
|
return 1;
|
|
}
|