diff options
Diffstat (limited to 'init/builtins.c')
| -rw-r--r-- | init/builtins.c | 66 |
1 files changed, 61 insertions, 5 deletions
diff --git a/init/builtins.c b/init/builtins.c index 17df0af..93ce6e8 100644 --- a/init/builtins.c +++ b/init/builtins.c @@ -29,6 +29,7 @@ #include <stdlib.h> #include <sys/mount.h> #include <sys/resource.h> +#include <linux/loop.h> #include "init.h" #include "keywords.h" @@ -257,7 +258,7 @@ static struct { int do_mount(int nargs, char **args) { char tmp[64]; - char *source; + char *source, *target, *system; char *options = NULL; unsigned flags = 0; int n, i; @@ -275,15 +276,70 @@ int do_mount(int nargs, char **args) options = args[n]; } + system = args[1]; source = args[2]; + target = args[3]; + if (!strncmp(source, "mtd@", 4)) { n = mtd_name_to_number(source + 4); - if (n >= 0) { - sprintf(tmp, "/dev/block/mtdblock%d", n); - source = tmp; + if (n < 0) { + return -1; + } + + sprintf(tmp, "/dev/block/mtdblock%d", n); + + if (mount(tmp, target, system, flags, options) < 0) { + return -1; + } + + return 0; + } else if (!strncmp(source, "loop@", 5)) { + int mode, loop, fd; + struct loop_info info; + + mode = (flags & MS_RDONLY) ? O_RDONLY : O_RDWR; + fd = open(source + 5, mode); + if (fd < 0) { + return -1; } + + for (n = 0; ; n++) { + sprintf(tmp, "/dev/block/loop%d", n); + loop = open(tmp, mode); + if (loop < 0) { + return -1; + } + + /* if it is a blank loop device */ + if (ioctl(loop, LOOP_GET_STATUS, &info) < 0 && errno == ENXIO) { + /* if it becomes our loop device */ + if (ioctl(loop, LOOP_SET_FD, fd) >= 0) { + close(fd); + + if (mount(tmp, target, system, flags, options) < 0) { + ioctl(loop, LOOP_CLR_FD, 0); + close(loop); + return -1; + } + + close(loop); + return 0; + } + } + + close(loop); + } + + close(fd); + ERROR("out of loopback devices"); + return -1; + } else { + if (mount(source, target, system, flags, options) < 0) { + return -1; + } + + return 0; } - return mount(source, args[3], args[1], flags, options); } int do_setkey(int nargs, char **args) |