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Fix adb remount on non-MTD devices 

Change-Id: If8e07502bcface53aaac81022f6183c6a147edc8
Signed-off-by: Mike Lockwood <lockwood@android.com>
This commit is contained in:
Colin Cross 2010-05-06 17:06:18 -07:00 committed by Mike Lockwood
parent f1c03de74e
commit 5762ec2905
1 changed files with 26 additions and 18 deletions
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44
adb/remount_service.c
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@ -30,19 +30,19 @@
static int system_ro = 1;
/* Returns the mount number of the requested partition from /proc/mtd */
static int find_mount(const char *findme)
/* Returns the device used to mount a directory in /proc/mounts */
static char *find_mount(const char *dir)
{
int fd;
int res;
int size;
char *token = NULL;
const char delims[] = "\n";
char buf[1024];
char buf[4096];
fd = unix_open("/proc/mtd", O_RDONLY);
fd = unix_open("/proc/mounts", O_RDONLY);
if (fd < 0)
return -errno;
return NULL;
buf[sizeof(buf) - 1] = '\0';
size = adb_read(fd, buf, sizeof(buf) - 1);
@ -51,33 +51,41 @@ static int find_mount(const char *findme)
token = strtok(buf, delims);
while (token) {
char mtdname[16];
int mtdnum, mtdsize, mtderasesize;
char mount_dev[256];
char mount_dir[256];
int mount_freq;
int mount_passno;
res = sscanf(token, "mtd%d: %x %x %15s",
&mtdnum, &mtdsize, &mtderasesize, mtdname);
if (res == 4 && !strcmp(mtdname, findme))
return mtdnum;
res = sscanf(token, "%255s %255s %*s %*s %d %d\n",
mount_dev, mount_dir, &mount_freq, &mount_passno);
mount_dev[255] = 0;
mount_dir[255] = 0;
if (res == 4 && (strcmp(dir, mount_dir) == 0))
return strdup(mount_dev);
token = strtok(NULL, delims);
}
return -1;
return NULL;
}
/* Init mounts /system as read only, remount to enable writes. */
static int remount_system()
{
int num;
char source[64];
char *dev;
if (system_ro == 0) {
return 0;
}
if ((num = find_mount("\"system\"")) < 0)
dev = find_mount("/system");
if (!dev)
return -1;
snprintf(source, sizeof source, "/dev/block/mtdblock%d", num);
system_ro = mount(source, "/system", "yaffs2", MS_REMOUNT, NULL);
system_ro = mount(dev, "/system", "none", MS_REMOUNT, NULL);
free(dev);
return system_ro;
}