From: Eric Andersen Date: Thu, 1 Mar 2001 07:50:04 +0000 (-0000) Subject: Reduce the size of mount (and bypass /proc/filesystems) by using the sysfs X-Git-Tag: 0_50~136 X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=7b91f020217823736f59e9eccfc721b05b937807;p=oweals%2Fbusybox.git Reduce the size of mount (and bypass /proc/filesystems) by using the sysfs system call, based on work done by Glenn McGrath in December. -Erik --- diff --git a/mount.c b/mount.c index 76cab7d79..2353a8ac2 100644 --- a/mount.c +++ b/mount.c @@ -83,6 +83,7 @@ extern int mount (__const char *__special_file, __const char *__dir, __const void *__data); extern int umount (__const char *__special_file); extern int umount2 (__const char *__special_file, int __flags); +static _syscall3(int, sysfs, int, option, unsigned int, fs_index, char *, buf); extern const char mtab_file[]; /* Defined in utility.c */ @@ -233,72 +234,24 @@ mount_one(char *blockDevice, char *directory, char *filesystemType, { int status = 0; - char buf[255]; if (strcmp(filesystemType, "auto") == 0) { - FILE *f = xfopen("/proc/filesystems", "r"); - - while (fgets(buf, sizeof(buf), f) != NULL) { - filesystemType = buf; - if (*filesystemType == '\t') { // Not a nodev filesystem - - // Add NULL termination to each line - while (*filesystemType && *filesystemType != '\n') - filesystemType++; - *filesystemType = '\0'; - - filesystemType = buf; - filesystemType++; // hop past tab - - status = do_mount(blockDevice, directory, filesystemType, - flags | MS_MGC_VAL, string_flags, - useMtab, fakeIt, mtab_opts); - if (status == TRUE) - break; - } - } - fclose(f); - } else -#if defined BB_FEATURE_USE_DEVPS_PATCH - if (strcmp(filesystemType, "auto") == 0) { - int fd, i, numfilesystems; - char device[] = "/dev/mtab"; - struct k_fstype *fslist; - - /* open device */ - fd = open(device, O_RDONLY); - if (fd < 0) - perror_msg_and_die("open failed for `%s'", device); - - /* How many filesystems? We need to know to allocate enough space */ - numfilesystems = ioctl (fd, DEVMTAB_COUNT_FILESYSTEMS); - if (numfilesystems<0) - perror_msg_and_die("\nDEVMTAB_COUNT_FILESYSTEMS"); - fslist = (struct k_fstype *) xcalloc ( numfilesystems, sizeof(struct k_fstype)); - - /* Grab the list of available filesystems */ - status = ioctl (fd, DEVMTAB_GET_FILESYSTEMS, fslist); - if (status<0) - perror_msg_and_die("\nDEVMTAB_GET_FILESYSTEMS"); - - /* Walk the list trying to mount filesystems - * that do not claim to be nodev filesystems */ - for( i = 0 ; i < numfilesystems ; i++) { - if (fslist[i].mnt_nodev) - continue; - status = do_mount(blockDevice, directory, fslist[i].mnt_type, - flags | MS_MGC_VAL, string_flags, - useMtab, fakeIt, mtab_opts); + int i=0; + const int num_of_filesystems = sysfs(3, 0, 0); + char buf[255]; + filesystemType=buf; + + while(i < num_of_filesystems) { + sysfs(2, i++, filesystemType); + status = do_mount(blockDevice, directory, filesystemType, + flags | MS_MGC_VAL, string_flags, + useMtab, fakeIt, mtab_opts); if (status == TRUE) break; } - free( fslist); - close(fd); - } else -#endif - { + } else { status = do_mount(blockDevice, directory, filesystemType, - flags | MS_MGC_VAL, string_flags, useMtab, - fakeIt, mtab_opts); + flags | MS_MGC_VAL, string_flags, useMtab, + fakeIt, mtab_opts); } if (status == FALSE) { diff --git a/util-linux/mount.c b/util-linux/mount.c index 76cab7d79..2353a8ac2 100644 --- a/util-linux/mount.c +++ b/util-linux/mount.c @@ -83,6 +83,7 @@ extern int mount (__const char *__special_file, __const char *__dir, __const void *__data); extern int umount (__const char *__special_file); extern int umount2 (__const char *__special_file, int __flags); +static _syscall3(int, sysfs, int, option, unsigned int, fs_index, char *, buf); extern const char mtab_file[]; /* Defined in utility.c */ @@ -233,72 +234,24 @@ mount_one(char *blockDevice, char *directory, char *filesystemType, { int status = 0; - char buf[255]; if (strcmp(filesystemType, "auto") == 0) { - FILE *f = xfopen("/proc/filesystems", "r"); - - while (fgets(buf, sizeof(buf), f) != NULL) { - filesystemType = buf; - if (*filesystemType == '\t') { // Not a nodev filesystem - - // Add NULL termination to each line - while (*filesystemType && *filesystemType != '\n') - filesystemType++; - *filesystemType = '\0'; - - filesystemType = buf; - filesystemType++; // hop past tab - - status = do_mount(blockDevice, directory, filesystemType, - flags | MS_MGC_VAL, string_flags, - useMtab, fakeIt, mtab_opts); - if (status == TRUE) - break; - } - } - fclose(f); - } else -#if defined BB_FEATURE_USE_DEVPS_PATCH - if (strcmp(filesystemType, "auto") == 0) { - int fd, i, numfilesystems; - char device[] = "/dev/mtab"; - struct k_fstype *fslist; - - /* open device */ - fd = open(device, O_RDONLY); - if (fd < 0) - perror_msg_and_die("open failed for `%s'", device); - - /* How many filesystems? We need to know to allocate enough space */ - numfilesystems = ioctl (fd, DEVMTAB_COUNT_FILESYSTEMS); - if (numfilesystems<0) - perror_msg_and_die("\nDEVMTAB_COUNT_FILESYSTEMS"); - fslist = (struct k_fstype *) xcalloc ( numfilesystems, sizeof(struct k_fstype)); - - /* Grab the list of available filesystems */ - status = ioctl (fd, DEVMTAB_GET_FILESYSTEMS, fslist); - if (status<0) - perror_msg_and_die("\nDEVMTAB_GET_FILESYSTEMS"); - - /* Walk the list trying to mount filesystems - * that do not claim to be nodev filesystems */ - for( i = 0 ; i < numfilesystems ; i++) { - if (fslist[i].mnt_nodev) - continue; - status = do_mount(blockDevice, directory, fslist[i].mnt_type, - flags | MS_MGC_VAL, string_flags, - useMtab, fakeIt, mtab_opts); + int i=0; + const int num_of_filesystems = sysfs(3, 0, 0); + char buf[255]; + filesystemType=buf; + + while(i < num_of_filesystems) { + sysfs(2, i++, filesystemType); + status = do_mount(blockDevice, directory, filesystemType, + flags | MS_MGC_VAL, string_flags, + useMtab, fakeIt, mtab_opts); if (status == TRUE) break; } - free( fslist); - close(fd); - } else -#endif - { + } else { status = do_mount(blockDevice, directory, filesystemType, - flags | MS_MGC_VAL, string_flags, useMtab, - fakeIt, mtab_opts); + flags | MS_MGC_VAL, string_flags, useMtab, + fakeIt, mtab_opts); } if (status == FALSE) { diff --git a/utility.c b/utility.c index df4573c16..76299beb7 100644 --- a/utility.c +++ b/utility.c @@ -63,8 +63,8 @@ #include #include -/* Busybox mount uses either /proc/filesystems or /dev/mtab to get the - * list of available filesystems used for the -t auto option */ +/* Busybox mount uses either /proc/mounts or /dev/mtab to + * get the list of currently mounted filesystems */ #if defined BB_MOUNT || defined BB_UMOUNT || defined BB_DF # if defined BB_MTAB const char mtab_file[] = "/etc/mtab";