* Added -o loop option for mount, and support in umount for loop
devices. Support is toggled by MOUNT_LOOP feature -- Ben Collins
<bcollins@debian.org>
-Erik
This commit is contained in:
Erik Andersen
parent
05df239ed9
commit
b7cc49d992
@ -10,6 +10,9 @@
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* mkdir -p would print an error when asked to mkdir an existing dir
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with no interveining subdirectories.
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* Fixed "syslogd -O" so that it works.
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* Added -o loop option for mount, and support in umount for loop
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devices. Support is toggled by MOUNT_LOOP feature -- Ben Collins
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<bcollins@debian.org>
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-Erik Andersen
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@ -103,20 +103,31 @@
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// enable features that use the /proc filesystem (apps that
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// break without this will tell you on compile)...
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#define BB_FEATURE_USE_PROCFS
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//
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// Use termios to manipulate the screen ('more' is prettier with this on)
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#define BB_FEATURE_USE_TERMIOS
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//
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// calculate terminal & column widths (for more and ls)
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#define BB_FEATURE_AUTOWIDTH
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//
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// show username/groupnames (bypasses libc6 NSS) for ls
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#define BB_FEATURE_LS_USERNAME
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//
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// show file timestamps in ls
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#define BB_FEATURE_LS_TIMESTAMPS
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//
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// enable ls -p and -F
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#define BB_FEATURE_LS_FILETYPES
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//
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// Change ping implementation -- simplified, featureless, but really small.
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//#define BB_SIMPLE_PING
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////
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// Make init use a simplified /etc/inittab file (recommended).
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#define BB_FEATURE_USE_INITTAB
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//
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//Enable init being called as /linuxrc
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#define BB_FEATURE_LINUXRC
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//
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// Enable support for loop devices in mount
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#define BB_FEATURE_MOUNT_LOOP
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//
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129
mount.c
129
mount.c
@ -28,6 +28,9 @@
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* putting it back as a compile-time option some time),
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* major adjustments to option parsing, and some serious
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* dieting all around.
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*
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* 2000-01-12 Ben Collins <bcollins@debian.org>, Borrowed utils-linux's
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* mount to add loop support.
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*/
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#include "internal.h"
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@ -41,6 +44,17 @@
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#include <ctype.h>
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#include <fstab.h>
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#if defined BB_FEATURE_MOUNT_LOOP
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <linux/loop.h>
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static int set_loop(const char *device, const char *file, int offset, int *loopro);
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static char *find_unused_loop_device (void);
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static int use_loop = 0;
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#endif
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extern const char mtab_file[]; /* Defined in utility.c */
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static const char mount_usage[] = "\tmount [flags]\n"
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@ -61,6 +75,9 @@ static const char mount_usage[] = "\tmount [flags]\n"
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"\tasync / sync:\tWrites are asynchronous / synchronous.\n"
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"\tdev / nodev:\tAllow use of special device files / disallow them.\n"
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"\texec / noexec:\tAllow use of executable files / disallow them.\n"
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#if defined BB_FEATURE_MOUNT_LOOP
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"\tloop: Mounts a file via loop device.\n"
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#endif
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"\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
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"\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
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"\tro / rw: Mount for read-only / read-write.\n"
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@ -91,28 +108,48 @@ static const struct mount_options mount_options[] = {
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{0, 0, 0}
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};
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#if ! defined BB_MTAB
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#define do_mount(specialfile, dir, filesystemtype, flags, string_flags, useMtab, fakeIt, mtab_opts) \
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mount(specialfile, dir, filesystemtype, flags, string_flags)
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#else
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static int
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do_mount(char* specialfile, char* dir, char* filesystemtype,
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long flags, void* string_flags, int useMtab, int fakeIt, char* mtab_opts)
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{
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int status=0;
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#if defined BB_MTAB
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if (fakeIt==FALSE)
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#endif
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{
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#if defined BB_FEATURE_MOUNT_LOOP
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if (use_loop) {
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int loro = flags & MS_RDONLY;
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char *lofile = specialfile;
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specialfile = find_unused_loop_device();
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if (specialfile == NULL) {
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fprintf(stderr, "Could not find a spare loop device\n");
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exit(1);
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}
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if (set_loop (specialfile, lofile, 0, &loro)) {
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fprintf(stderr, "Could not setup loop device\n");
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exit(1);
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}
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if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
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fprintf(stderr, "WARNING: loop device is read-only\n");
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flags &= ~MS_RDONLY;
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}
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}
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#endif
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status=mount(specialfile, dir, filesystemtype, flags, string_flags);
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}
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#if defined BB_MTAB
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if (status == 0) {
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if (useMtab==TRUE)
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write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
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return 0;
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}
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else
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#endif
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return(status);
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}
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#endif
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#if defined BB_MTAB
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@ -148,16 +185,20 @@ parse_mount_options ( char *options, unsigned long *flags, char *strflags)
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}
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f++;
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}
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#if defined BB_FEATURE_MOUNT_LOOP
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if (gotone==FALSE && !strcasecmp ("loop", options)) { /* loop device support */
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use_loop = 1;
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gotone=TRUE;
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}
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#endif
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if (*strflags && strflags!= '\0' && gotone==FALSE) {
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char *temp=strflags;
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temp += strlen (strflags);
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*temp++ = ',';
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*temp++ = '\0';
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}
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if (gotone==FALSE) {
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if (gotone==FALSE)
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strcat (strflags, options);
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gotone=FALSE;
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}
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if (comma) {
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*comma = ',';
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options = ++comma;
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@ -356,3 +397,73 @@ extern int mount_main (int argc, char **argv)
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goodbye:
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usage( mount_usage);
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}
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#if defined BB_FEATURE_MOUNT_LOOP
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static int set_loop(const char *device, const char *file, int offset, int *loopro)
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{
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struct loop_info loopinfo;
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int fd, ffd, mode;
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mode = *loopro ? O_RDONLY : O_RDWR;
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if ((ffd = open (file, mode)) < 0 && !*loopro
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&& (errno != EROFS || (ffd = open (file, mode = O_RDONLY)) < 0)) {
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perror (file);
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return 1;
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}
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if ((fd = open (device, mode)) < 0) {
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close(ffd);
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perror (device);
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return 1;
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}
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*loopro = (mode == O_RDONLY);
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memset(&loopinfo, 0, sizeof(loopinfo));
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strncpy(loopinfo.lo_name, file, LO_NAME_SIZE);
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loopinfo.lo_name[LO_NAME_SIZE-1] = 0;
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loopinfo.lo_offset = offset;
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loopinfo.lo_encrypt_key_size = 0;
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if (ioctl(fd, LOOP_SET_FD, ffd) < 0) {
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perror("ioctl: LOOP_SET_FD");
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exit(1);
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}
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if (ioctl(fd, LOOP_SET_STATUS, &loopinfo) < 0) {
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(void) ioctl(fd, LOOP_CLR_FD, 0);
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perror("ioctl: LOOP_SET_STATUS");
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exit(1);
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}
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close(fd);
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close(ffd);
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return 0;
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}
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static char *find_unused_loop_device (void)
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{
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char dev[20];
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int i, fd, somedev = 0, someloop = 0;
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struct stat statbuf;
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struct loop_info loopinfo;
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for(i = 0; i < 256; i++) {
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sprintf(dev, "/dev/loop%d", i);
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if (stat (dev, &statbuf) == 0 && S_ISBLK(statbuf.st_mode)) {
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somedev++;
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fd = open (dev, O_RDONLY);
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if (fd >= 0) {
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if(ioctl (fd, LOOP_GET_STATUS, &loopinfo) == 0)
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someloop++; /* in use */
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else if (errno == ENXIO) {
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close (fd);
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return strdup(dev); /* probably free */
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}
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close (fd);
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}
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continue;
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}
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if (i >= 7)
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break;
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}
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return NULL;
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}
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#endif /* BB_FEATURE_MOUNT_LOOP */
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66
umount.c
66
umount.c
@ -28,6 +28,14 @@
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#include <fstab.h>
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#include <errno.h>
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#if defined BB_FEATURE_MOUNT_LOOP
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <linux/loop.h>
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static int del_loop(const char *device);
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#endif
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static const char umount_usage[] =
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"Usage: umount [flags] filesystem|directory\n\n"
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"Flags:\n"
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@ -44,23 +52,54 @@ static int useMtab = TRUE;
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static int umountAll = FALSE;
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extern const char mtab_file[]; /* Defined in utility.c */
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#if ! defined BB_MTAB
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#define do_umount( blockDevice, useMtab) umount( blockDevice)
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#else
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static int
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do_umount(const char* name, int useMtab)
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{
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int status = umount(name);
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int status;
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#if defined BB_FEATURE_MOUNT_LOOP
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/* check to see if this is a loop device */
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struct stat fst;
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char dev[20];
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const char *oldname = NULL;
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int i;
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if (stat(name, &fst)) {
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fprintf(stderr, "umount: %s: %s\n", name, strerror(errno));
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exit(1);
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}
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for (i = 0 ; i <= 7 ; i++) {
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struct stat lst;
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sprintf(dev, "/dev/loop%d", i);
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if (stat(dev, &lst))
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continue;
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if (lst.st_dev == fst.st_dev) {
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oldname = name;
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name = dev;
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break;
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}
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}
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#endif
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status = umount(name);
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#if defined BB_FEATURE_MOUNT_LOOP
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if (!strncmp("/dev/loop", name, 9)) { /* this was a loop device, delete it */
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del_loop(name);
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if (oldname != NULL)
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name = oldname;
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}
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#endif
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#if defined BB_MTAB
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if ( status == 0 ) {
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if ( useMtab==TRUE )
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erase_mtab(name);
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return 0;
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}
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else
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#endif
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return(status);
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}
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#endif
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static int
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umount_all(int useMtab)
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@ -139,3 +178,20 @@ umount_main(int argc, char** argv)
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}
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}
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#if defined BB_FEATURE_MOUNT_LOOP
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static int del_loop(const char *device)
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{
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int fd;
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if ((fd = open(device, O_RDONLY)) < 0) {
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perror(device);
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exit(1);
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}
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if (ioctl(fd, LOOP_CLR_FD, 0) < 0) {
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perror("ioctl: LOOP_CLR_FD");
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exit(1);
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}
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close(fd);
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return(0);
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}
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#endif
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@ -28,6 +28,9 @@
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* putting it back as a compile-time option some time),
|
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* major adjustments to option parsing, and some serious
|
||||
* dieting all around.
|
||||
*
|
||||
* 2000-01-12 Ben Collins <bcollins@debian.org>, Borrowed utils-linux's
|
||||
* mount to add loop support.
|
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*/
|
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|
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#include "internal.h"
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@ -41,6 +44,17 @@
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#include <ctype.h>
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#include <fstab.h>
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|
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#if defined BB_FEATURE_MOUNT_LOOP
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <linux/loop.h>
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static int set_loop(const char *device, const char *file, int offset, int *loopro);
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static char *find_unused_loop_device (void);
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static int use_loop = 0;
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#endif
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extern const char mtab_file[]; /* Defined in utility.c */
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static const char mount_usage[] = "\tmount [flags]\n"
|
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@ -61,6 +75,9 @@ static const char mount_usage[] = "\tmount [flags]\n"
|
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"\tasync / sync:\tWrites are asynchronous / synchronous.\n"
|
||||
"\tdev / nodev:\tAllow use of special device files / disallow them.\n"
|
||||
"\texec / noexec:\tAllow use of executable files / disallow them.\n"
|
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#if defined BB_FEATURE_MOUNT_LOOP
|
||||
"\tloop: Mounts a file via loop device.\n"
|
||||
#endif
|
||||
"\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
|
||||
"\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
|
||||
"\tro / rw: Mount for read-only / read-write.\n"
|
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@ -91,28 +108,48 @@ static const struct mount_options mount_options[] = {
|
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{0, 0, 0}
|
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};
|
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|
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#if ! defined BB_MTAB
|
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#define do_mount(specialfile, dir, filesystemtype, flags, string_flags, useMtab, fakeIt, mtab_opts) \
|
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mount(specialfile, dir, filesystemtype, flags, string_flags)
|
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#else
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static int
|
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do_mount(char* specialfile, char* dir, char* filesystemtype,
|
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long flags, void* string_flags, int useMtab, int fakeIt, char* mtab_opts)
|
||||
{
|
||||
int status=0;
|
||||
|
||||
#if defined BB_MTAB
|
||||
if (fakeIt==FALSE)
|
||||
#endif
|
||||
{
|
||||
#if defined BB_FEATURE_MOUNT_LOOP
|
||||
if (use_loop) {
|
||||
int loro = flags & MS_RDONLY;
|
||||
char *lofile = specialfile;
|
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specialfile = find_unused_loop_device();
|
||||
if (specialfile == NULL) {
|
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fprintf(stderr, "Could not find a spare loop device\n");
|
||||
exit(1);
|
||||
}
|
||||
if (set_loop (specialfile, lofile, 0, &loro)) {
|
||||
fprintf(stderr, "Could not setup loop device\n");
|
||||
exit(1);
|
||||
}
|
||||
if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
|
||||
fprintf(stderr, "WARNING: loop device is read-only\n");
|
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flags &= ~MS_RDONLY;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
status=mount(specialfile, dir, filesystemtype, flags, string_flags);
|
||||
|
||||
}
|
||||
#if defined BB_MTAB
|
||||
if (status == 0) {
|
||||
if (useMtab==TRUE)
|
||||
write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
|
||||
return 0;
|
||||
}
|
||||
else
|
||||
#endif
|
||||
return(status);
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
|
||||
#if defined BB_MTAB
|
||||
@ -148,16 +185,20 @@ parse_mount_options ( char *options, unsigned long *flags, char *strflags)
|
||||
}
|
||||
f++;
|
||||
}
|
||||
#if defined BB_FEATURE_MOUNT_LOOP
|
||||
if (gotone==FALSE && !strcasecmp ("loop", options)) { /* loop device support */
|
||||
use_loop = 1;
|
||||
gotone=TRUE;
|
||||
}
|
||||
#endif
|
||||
if (*strflags && strflags!= '\0' && gotone==FALSE) {
|
||||
char *temp=strflags;
|
||||
temp += strlen (strflags);
|
||||
*temp++ = ',';
|
||||
*temp++ = '\0';
|
||||
}
|
||||
if (gotone==FALSE) {
|
||||
if (gotone==FALSE)
|
||||
strcat (strflags, options);
|
||||
gotone=FALSE;
|
||||
}
|
||||
if (comma) {
|
||||
*comma = ',';
|
||||
options = ++comma;
|
||||
@ -356,3 +397,73 @@ extern int mount_main (int argc, char **argv)
|
||||
goodbye:
|
||||
usage( mount_usage);
|
||||
}
|
||||
|
||||
#if defined BB_FEATURE_MOUNT_LOOP
|
||||
static int set_loop(const char *device, const char *file, int offset, int *loopro)
|
||||
{
|
||||
struct loop_info loopinfo;
|
||||
int fd, ffd, mode;
|
||||
|
||||
mode = *loopro ? O_RDONLY : O_RDWR;
|
||||
if ((ffd = open (file, mode)) < 0 && !*loopro
|
||||
&& (errno != EROFS || (ffd = open (file, mode = O_RDONLY)) < 0)) {
|
||||
perror (file);
|
||||
return 1;
|
||||
}
|
||||
if ((fd = open (device, mode)) < 0) {
|
||||
close(ffd);
|
||||
perror (device);
|
||||
return 1;
|
||||
}
|
||||
*loopro = (mode == O_RDONLY);
|
||||
|
||||
memset(&loopinfo, 0, sizeof(loopinfo));
|
||||
strncpy(loopinfo.lo_name, file, LO_NAME_SIZE);
|
||||
loopinfo.lo_name[LO_NAME_SIZE-1] = 0;
|
||||
|
||||
loopinfo.lo_offset = offset;
|
||||
|
||||
loopinfo.lo_encrypt_key_size = 0;
|
||||
if (ioctl(fd, LOOP_SET_FD, ffd) < 0) {
|
||||
perror("ioctl: LOOP_SET_FD");
|
||||
exit(1);
|
||||
}
|
||||
if (ioctl(fd, LOOP_SET_STATUS, &loopinfo) < 0) {
|
||||
(void) ioctl(fd, LOOP_CLR_FD, 0);
|
||||
perror("ioctl: LOOP_SET_STATUS");
|
||||
exit(1);
|
||||
}
|
||||
close(fd);
|
||||
close(ffd);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static char *find_unused_loop_device (void)
|
||||
{
|
||||
char dev[20];
|
||||
int i, fd, somedev = 0, someloop = 0;
|
||||
struct stat statbuf;
|
||||
struct loop_info loopinfo;
|
||||
|
||||
for(i = 0; i < 256; i++) {
|
||||
sprintf(dev, "/dev/loop%d", i);
|
||||
if (stat (dev, &statbuf) == 0 && S_ISBLK(statbuf.st_mode)) {
|
||||
somedev++;
|
||||
fd = open (dev, O_RDONLY);
|
||||
if (fd >= 0) {
|
||||
if(ioctl (fd, LOOP_GET_STATUS, &loopinfo) == 0)
|
||||
someloop++; /* in use */
|
||||
else if (errno == ENXIO) {
|
||||
close (fd);
|
||||
return strdup(dev); /* probably free */
|
||||
}
|
||||
close (fd);
|
||||
}
|
||||
continue;
|
||||
}
|
||||
if (i >= 7)
|
||||
break;
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
#endif /* BB_FEATURE_MOUNT_LOOP */
|
||||
|
||||
@ -28,6 +28,14 @@
|
||||
#include <fstab.h>
|
||||
#include <errno.h>
|
||||
|
||||
#if defined BB_FEATURE_MOUNT_LOOP
|
||||
#include <fcntl.h>
|
||||
#include <sys/ioctl.h>
|
||||
#include <linux/loop.h>
|
||||
|
||||
static int del_loop(const char *device);
|
||||
#endif
|
||||
|
||||
static const char umount_usage[] =
|
||||
"Usage: umount [flags] filesystem|directory\n\n"
|
||||
"Flags:\n"
|
||||
@ -44,23 +52,54 @@ static int useMtab = TRUE;
|
||||
static int umountAll = FALSE;
|
||||
extern const char mtab_file[]; /* Defined in utility.c */
|
||||
|
||||
#if ! defined BB_MTAB
|
||||
#define do_umount( blockDevice, useMtab) umount( blockDevice)
|
||||
#else
|
||||
static int
|
||||
do_umount(const char* name, int useMtab)
|
||||
{
|
||||
int status = umount(name);
|
||||
int status;
|
||||
|
||||
#if defined BB_FEATURE_MOUNT_LOOP
|
||||
/* check to see if this is a loop device */
|
||||
struct stat fst;
|
||||
char dev[20];
|
||||
const char *oldname = NULL;
|
||||
int i;
|
||||
|
||||
if (stat(name, &fst)) {
|
||||
fprintf(stderr, "umount: %s: %s\n", name, strerror(errno));
|
||||
exit(1);
|
||||
}
|
||||
for (i = 0 ; i <= 7 ; i++) {
|
||||
struct stat lst;
|
||||
sprintf(dev, "/dev/loop%d", i);
|
||||
if (stat(dev, &lst))
|
||||
continue;
|
||||
if (lst.st_dev == fst.st_dev) {
|
||||
oldname = name;
|
||||
name = dev;
|
||||
break;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
status = umount(name);
|
||||
|
||||
#if defined BB_FEATURE_MOUNT_LOOP
|
||||
if (!strncmp("/dev/loop", name, 9)) { /* this was a loop device, delete it */
|
||||
del_loop(name);
|
||||
if (oldname != NULL)
|
||||
name = oldname;
|
||||
}
|
||||
#endif
|
||||
#if defined BB_MTAB
|
||||
if ( status == 0 ) {
|
||||
if ( useMtab==TRUE )
|
||||
erase_mtab(name);
|
||||
return 0;
|
||||
}
|
||||
else
|
||||
#endif
|
||||
return(status);
|
||||
}
|
||||
#endif
|
||||
|
||||
static int
|
||||
umount_all(int useMtab)
|
||||
@ -139,3 +178,20 @@ umount_main(int argc, char** argv)
|
||||
}
|
||||
}
|
||||
|
||||
#if defined BB_FEATURE_MOUNT_LOOP
|
||||
static int del_loop(const char *device)
|
||||
{
|
||||
int fd;
|
||||
|
||||
if ((fd = open(device, O_RDONLY)) < 0) {
|
||||
perror(device);
|
||||
exit(1);
|
||||
}
|
||||
if (ioctl(fd, LOOP_CLR_FD, 0) < 0) {
|
||||
perror("ioctl: LOOP_CLR_FD");
|
||||
exit(1);
|
||||
}
|
||||
close(fd);
|
||||
return(0);
|
||||
}
|
||||
#endif
|
||||
|
||||
Loading…
Reference in New Issue
Block a user