mount and umount could leak loop device allocations causing the system to
quickly run out. Also disable init's SIGHUP handler during shutdown. -Erik
This commit is contained in:
parent
3fe39dce5d
commit
5cbdd712f5
@ -32,6 +32,11 @@
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tail -f work only with a single file. This reduced tail
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from 6k to 2.4k. The bigger/more featured tail can still be
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had by disabling BB_FEATURE_SIMPLE_TAIL in dusybox.defs.h
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* Ping now falls back to doing the right thing if /etc/protocols
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turns up missing.
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* Fixed mount and umount. Previously they could leak loop device
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allocations, causing the system to quickly run out. Fix for umount
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by Ben Collins <bcollins@debian.org>, and mount was fixed by me.
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-Erik Andersen
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4
init.c
4
init.c
@ -359,6 +359,7 @@ static pid_t run(char* command,
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signal(SIGUSR2, SIG_DFL);
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signal(SIGINT, SIG_DFL);
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signal(SIGTERM, SIG_DFL);
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signal(SIGHUP, SIG_DFL);
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if ((fd = device_open(terminal, O_RDWR)) < 0) {
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message(LOG|CONSOLE, "Bummer, can't open %s\r\n", terminal);
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@ -458,6 +459,9 @@ goodnight:
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#ifndef DEBUG_INIT
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static void shutdown_system(void)
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{
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/* first disable our SIGHUP signal */
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signal(SIGHUP, SIG_DFL);
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/* Allow Ctrl-Alt-Del to reboot system. */
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reboot(RB_ENABLE_CAD);
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message(CONSOLE, "\r\nThe system is going down NOW !!\r\n");
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@ -359,6 +359,7 @@ static pid_t run(char* command,
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signal(SIGUSR2, SIG_DFL);
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signal(SIGINT, SIG_DFL);
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signal(SIGTERM, SIG_DFL);
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signal(SIGHUP, SIG_DFL);
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if ((fd = device_open(terminal, O_RDWR)) < 0) {
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message(LOG|CONSOLE, "Bummer, can't open %s\r\n", terminal);
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@ -458,6 +459,9 @@ goodnight:
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#ifndef DEBUG_INIT
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static void shutdown_system(void)
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{
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/* first disable our SIGHUP signal */
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signal(SIGHUP, SIG_DFL);
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/* Allow Ctrl-Alt-Del to reboot system. */
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reboot(RB_ENABLE_CAD);
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message(CONSOLE, "\r\nThe system is going down NOW !!\r\n");
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@ -175,6 +175,10 @@ extern int check_wildcard_match(const char* text, const char* pattern);
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extern long getNum (const char *cp);
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extern pid_t findInitPid();
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#if defined BB_FEATURE_MOUNT_LOOP
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extern int del_loop(const char *device);
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#endif
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#if defined BB_GUNZIP || defined BB_GZIP || defined BB_PRINTF || defined BB_TAIL
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extern void *xmalloc (size_t size);
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extern void error(char *msg);
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167
mount.c
167
mount.c
@ -127,11 +127,11 @@ do_mount(char* specialfile, char* dir, char* filesystemtype,
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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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return( FALSE);
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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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return( FALSE);
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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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@ -141,15 +141,26 @@ do_mount(char* specialfile, char* dir, char* filesystemtype,
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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 the mount was sucessful, do anything needed, then return TRUE */
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if (status == 0) {
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if (useMtab==TRUE)
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#if defined BB_MTAB
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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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}
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#endif
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return(status);
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return( TRUE);
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}
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/* Bummer. mount failed. Clean up */
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#if defined BB_FEATURE_MOUNT_LOOP
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if (specialfile != NULL) {
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del_loop(specialfile);
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}
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#endif
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return( FALSE);
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}
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@ -166,6 +177,75 @@ extern void whine_if_fstab_is_missing()
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#endif
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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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close(fd);
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close(ffd);
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return 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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close(fd);
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close(ffd);
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return 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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char *find_unused_loop_device (void)
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{
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char dev[20];
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int i, fd;
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struct stat statbuf;
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struct loop_info loopinfo;
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for(i = 0; i <= 7; 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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if ((fd = open (dev, O_RDONLY)) >= 0) {
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if(ioctl (fd, LOOP_GET_STATUS, &loopinfo) == -1) {
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if (errno == ENXIO) { /* probably free */
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close (fd);
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return strdup(dev);
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}
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}
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close (fd);
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}
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}
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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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/* Seperate standard mount options from the nonstandard string options */
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static void
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parse_mount_options ( char *options, unsigned long *flags, char *strflags)
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@ -240,7 +320,7 @@ mount_one(char *blockDevice, char *directory, char *filesystemType,
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status = do_mount (blockDevice, directory, filesystemType,
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flags | MS_MGC_VAL, string_flags, useMtab,
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fakeIt, mtab_opts);
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if (status == 0)
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if (status == TRUE)
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break;
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}
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}
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@ -253,7 +333,7 @@ mount_one(char *blockDevice, char *directory, char *filesystemType,
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fakeIt, mtab_opts);
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}
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if (status) {
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if (status==FALSE) {
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fprintf (stderr, "Mounting %s on %s failed: %s\n",
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blockDevice, directory, strerror(errno));
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return (FALSE);
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@ -400,70 +480,3 @@ 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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close(fd);
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close(ffd);
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return 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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close(fd);
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close(ffd);
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return 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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char *find_unused_loop_device (void)
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{
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char dev[20];
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int i, fd;
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struct stat statbuf;
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struct loop_info loopinfo;
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for(i = 0; i <= 7; 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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if ((fd = open (dev, O_RDONLY)) >= 0) {
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if(ioctl (fd, LOOP_GET_STATUS, &loopinfo) == -1 &&
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errno == ENXIO) { /* probably free */
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close (fd);
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return strdup(dev);
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}
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close (fd);
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}
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}
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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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@ -1,5 +1,5 @@
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/*
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* $Id: ping.c,v 1.6 1999/12/11 08:41:28 andersen Exp $
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* $Id: ping.c,v 1.7 2000/01/26 20:06:48 erik Exp $
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* Mini ping implementation for busybox
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*
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* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
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@ -319,10 +319,11 @@ static void ping(char *host)
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int sockopt;
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if (!(proto = getprotobyname("icmp"))) {
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fprintf(stderr, "ping: unknown protocol icmp\n");
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exit(1);
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/* getprotobyname failed, so just silently force
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* proto->p_proto to have the correct value for "icmp" */
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proto->p_proto = 1;
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||||
}
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if ((pingsock = socket(AF_INET, SOCK_RAW, proto->p_proto)) < 0) {
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if ((pingsock = socket(AF_INET, SOCK_RAW, proto->p_proto)) < 0) { /* 1 == ICMP */
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||||
if (errno == EPERM) {
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fprintf(stderr, "ping: permission denied. (are you root?)\n");
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||||
} else {
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||||
|
9
ping.c
9
ping.c
@ -1,5 +1,5 @@
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||||
/*
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||||
* $Id: ping.c,v 1.6 1999/12/11 08:41:28 andersen Exp $
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||||
* $Id: ping.c,v 1.7 2000/01/26 20:06:48 erik Exp $
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||||
* Mini ping implementation for busybox
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||||
*
|
||||
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
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||||
@ -319,10 +319,11 @@ static void ping(char *host)
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||||
int sockopt;
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||||
|
||||
if (!(proto = getprotobyname("icmp"))) {
|
||||
fprintf(stderr, "ping: unknown protocol icmp\n");
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||||
exit(1);
|
||||
/* getprotobyname failed, so just silently force
|
||||
* proto->p_proto to have the correct value for "icmp" */
|
||||
proto->p_proto = 1;
|
||||
}
|
||||
if ((pingsock = socket(AF_INET, SOCK_RAW, proto->p_proto)) < 0) {
|
||||
if ((pingsock = socket(AF_INET, SOCK_RAW, proto->p_proto)) < 0) { /* 1 == ICMP */
|
||||
if (errno == EPERM) {
|
||||
fprintf(stderr, "ping: permission denied. (are you root?)\n");
|
||||
} else {
|
||||
|
68
umount.c
68
umount.c
@ -28,14 +28,6 @@
|
||||
#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[] =
|
||||
"umount [flags] filesystem|directory\n\n"
|
||||
"Flags:\n"
|
||||
@ -52,43 +44,34 @@ static int useMtab = TRUE;
|
||||
static int umountAll = FALSE;
|
||||
extern const char mtab_file[]; /* Defined in utility.c */
|
||||
|
||||
#define MIN(x,y) (x > y ? x : y)
|
||||
|
||||
static int
|
||||
do_umount(const char* name, int useMtab)
|
||||
{
|
||||
int status;
|
||||
struct mntent *m;
|
||||
FILE *mountTable;
|
||||
const char *blockDevice = NULL;
|
||||
|
||||
#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;
|
||||
if ((mountTable = setmntent (mtab_file, "r"))) {
|
||||
while ((m = getmntent (mountTable)) != 0) {
|
||||
if (strncmp(m->mnt_dir, name,
|
||||
MIN(strlen(m->mnt_dir),strlen(name))) == 0)
|
||||
blockDevice = m->mnt_fsname;
|
||||
else if (strcmp(m->mnt_fsname, name) == 0) {
|
||||
blockDevice = name;
|
||||
name = m->mnt_dir;
|
||||
}
|
||||
}
|
||||
}
|
||||
#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;
|
||||
}
|
||||
if (blockDevice != NULL && !strncmp("/dev/loop", blockDevice, 9))
|
||||
/* this was a loop device, delete it */
|
||||
del_loop(blockDevice);
|
||||
#endif
|
||||
#if defined BB_MTAB
|
||||
if ( status == 0 ) {
|
||||
@ -178,20 +161,3 @@ 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
|
||||
|
@ -127,11 +127,11 @@ do_mount(char* specialfile, char* dir, char* filesystemtype,
|
||||
specialfile = find_unused_loop_device();
|
||||
if (specialfile == NULL) {
|
||||
fprintf(stderr, "Could not find a spare loop device\n");
|
||||
exit(1);
|
||||
return( FALSE);
|
||||
}
|
||||
if (set_loop (specialfile, lofile, 0, &loro)) {
|
||||
fprintf(stderr, "Could not setup loop device\n");
|
||||
exit(1);
|
||||
return( FALSE);
|
||||
}
|
||||
if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
|
||||
fprintf(stderr, "WARNING: loop device is read-only\n");
|
||||
@ -141,15 +141,26 @@ do_mount(char* specialfile, char* dir, char* filesystemtype,
|
||||
#endif
|
||||
status=mount(specialfile, dir, filesystemtype, flags, string_flags);
|
||||
}
|
||||
#if defined BB_MTAB
|
||||
|
||||
|
||||
/* If the mount was sucessful, do anything needed, then return TRUE */
|
||||
if (status == 0) {
|
||||
if (useMtab==TRUE)
|
||||
|
||||
#if defined BB_MTAB
|
||||
if (useMtab==TRUE) {
|
||||
write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
|
||||
return 0;
|
||||
}
|
||||
else
|
||||
}
|
||||
#endif
|
||||
return(status);
|
||||
return( TRUE);
|
||||
}
|
||||
|
||||
/* Bummer. mount failed. Clean up */
|
||||
#if defined BB_FEATURE_MOUNT_LOOP
|
||||
if (specialfile != NULL) {
|
||||
del_loop(specialfile);
|
||||
}
|
||||
#endif
|
||||
return( FALSE);
|
||||
}
|
||||
|
||||
|
||||
@ -166,6 +177,75 @@ extern void whine_if_fstab_is_missing()
|
||||
#endif
|
||||
|
||||
|
||||
#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");
|
||||
close(fd);
|
||||
close(ffd);
|
||||
return 1;
|
||||
}
|
||||
if (ioctl(fd, LOOP_SET_STATUS, &loopinfo) < 0) {
|
||||
(void) ioctl(fd, LOOP_CLR_FD, 0);
|
||||
perror("ioctl: LOOP_SET_STATUS");
|
||||
close(fd);
|
||||
close(ffd);
|
||||
return 1;
|
||||
}
|
||||
close(fd);
|
||||
close(ffd);
|
||||
return 0;
|
||||
}
|
||||
|
||||
char *find_unused_loop_device (void)
|
||||
{
|
||||
char dev[20];
|
||||
int i, fd;
|
||||
struct stat statbuf;
|
||||
struct loop_info loopinfo;
|
||||
|
||||
for(i = 0; i <= 7; i++) {
|
||||
sprintf(dev, "/dev/loop%d", i);
|
||||
if (stat (dev, &statbuf) == 0 && S_ISBLK(statbuf.st_mode)) {
|
||||
if ((fd = open (dev, O_RDONLY)) >= 0) {
|
||||
if(ioctl (fd, LOOP_GET_STATUS, &loopinfo) == -1) {
|
||||
if (errno == ENXIO) { /* probably free */
|
||||
close (fd);
|
||||
return strdup(dev);
|
||||
}
|
||||
}
|
||||
close (fd);
|
||||
}
|
||||
}
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
#endif /* BB_FEATURE_MOUNT_LOOP */
|
||||
|
||||
/* Seperate standard mount options from the nonstandard string options */
|
||||
static void
|
||||
parse_mount_options ( char *options, unsigned long *flags, char *strflags)
|
||||
@ -240,7 +320,7 @@ mount_one(char *blockDevice, char *directory, char *filesystemType,
|
||||
status = do_mount (blockDevice, directory, filesystemType,
|
||||
flags | MS_MGC_VAL, string_flags, useMtab,
|
||||
fakeIt, mtab_opts);
|
||||
if (status == 0)
|
||||
if (status == TRUE)
|
||||
break;
|
||||
}
|
||||
}
|
||||
@ -253,7 +333,7 @@ mount_one(char *blockDevice, char *directory, char *filesystemType,
|
||||
fakeIt, mtab_opts);
|
||||
}
|
||||
|
||||
if (status) {
|
||||
if (status==FALSE) {
|
||||
fprintf (stderr, "Mounting %s on %s failed: %s\n",
|
||||
blockDevice, directory, strerror(errno));
|
||||
return (FALSE);
|
||||
@ -400,70 +480,3 @@ 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");
|
||||
close(fd);
|
||||
close(ffd);
|
||||
return 1;
|
||||
}
|
||||
if (ioctl(fd, LOOP_SET_STATUS, &loopinfo) < 0) {
|
||||
(void) ioctl(fd, LOOP_CLR_FD, 0);
|
||||
perror("ioctl: LOOP_SET_STATUS");
|
||||
close(fd);
|
||||
close(ffd);
|
||||
return 1;
|
||||
}
|
||||
close(fd);
|
||||
close(ffd);
|
||||
return 0;
|
||||
}
|
||||
|
||||
char *find_unused_loop_device (void)
|
||||
{
|
||||
char dev[20];
|
||||
int i, fd;
|
||||
struct stat statbuf;
|
||||
struct loop_info loopinfo;
|
||||
|
||||
for(i = 0; i <= 7; i++) {
|
||||
sprintf(dev, "/dev/loop%d", i);
|
||||
if (stat (dev, &statbuf) == 0 && S_ISBLK(statbuf.st_mode)) {
|
||||
if ((fd = open (dev, O_RDONLY)) >= 0) {
|
||||
if(ioctl (fd, LOOP_GET_STATUS, &loopinfo) == -1 &&
|
||||
errno == ENXIO) { /* probably free */
|
||||
close (fd);
|
||||
return strdup(dev);
|
||||
}
|
||||
close (fd);
|
||||
}
|
||||
}
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
#endif /* BB_FEATURE_MOUNT_LOOP */
|
||||
|
@ -28,14 +28,6 @@
|
||||
#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[] =
|
||||
"umount [flags] filesystem|directory\n\n"
|
||||
"Flags:\n"
|
||||
@ -52,43 +44,34 @@ static int useMtab = TRUE;
|
||||
static int umountAll = FALSE;
|
||||
extern const char mtab_file[]; /* Defined in utility.c */
|
||||
|
||||
#define MIN(x,y) (x > y ? x : y)
|
||||
|
||||
static int
|
||||
do_umount(const char* name, int useMtab)
|
||||
{
|
||||
int status;
|
||||
struct mntent *m;
|
||||
FILE *mountTable;
|
||||
const char *blockDevice = NULL;
|
||||
|
||||
#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;
|
||||
if ((mountTable = setmntent (mtab_file, "r"))) {
|
||||
while ((m = getmntent (mountTable)) != 0) {
|
||||
if (strncmp(m->mnt_dir, name,
|
||||
MIN(strlen(m->mnt_dir),strlen(name))) == 0)
|
||||
blockDevice = m->mnt_fsname;
|
||||
else if (strcmp(m->mnt_fsname, name) == 0) {
|
||||
blockDevice = name;
|
||||
name = m->mnt_dir;
|
||||
}
|
||||
}
|
||||
}
|
||||
#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;
|
||||
}
|
||||
if (blockDevice != NULL && !strncmp("/dev/loop", blockDevice, 9))
|
||||
/* this was a loop device, delete it */
|
||||
del_loop(blockDevice);
|
||||
#endif
|
||||
#if defined BB_MTAB
|
||||
if ( status == 0 ) {
|
||||
@ -178,20 +161,3 @@ 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
|
||||
|
25
utility.c
25
utility.c
@ -36,6 +36,13 @@
|
||||
#include <unistd.h>
|
||||
#include <ctype.h>
|
||||
|
||||
#if defined BB_FEATURE_MOUNT_LOOP
|
||||
#include <fcntl.h>
|
||||
#include <sys/ioctl.h>
|
||||
#include <linux/loop.h>
|
||||
#endif
|
||||
|
||||
|
||||
#if defined BB_MOUNT || defined BB_UMOUNT || defined BB_DF
|
||||
# if defined BB_FEATURE_USE_PROCFS
|
||||
const char mtab_file[] = "/proc/mounts";
|
||||
@ -1146,4 +1153,22 @@ extern int vdprintf(int d, const char *format, va_list ap)
|
||||
}
|
||||
#endif
|
||||
|
||||
#if defined BB_FEATURE_MOUNT_LOOP
|
||||
extern int del_loop(const char *device)
|
||||
{
|
||||
int fd;
|
||||
|
||||
if ((fd = open(device, O_RDONLY)) < 0) {
|
||||
perror(device);
|
||||
return( FALSE);
|
||||
}
|
||||
if (ioctl(fd, LOOP_CLR_FD, 0) < 0) {
|
||||
perror("ioctl: LOOP_CLR_FD");
|
||||
return( FALSE);
|
||||
}
|
||||
close(fd);
|
||||
return( TRUE);
|
||||
}
|
||||
#endif
|
||||
|
||||
/* END CODE */
|
||||
|
Loading…
Reference in New Issue
Block a user