am e919efea: Workaround a kernel race when loading dmcrypt table
* commit 'e919efea94b178ed214ed2e78ef0d008727d62ab':
Workaround a kernel race when loading dmcrypt table
diff --git a/cryptfs.c b/cryptfs.c
index b66f1ac..b2499aa 100644
--- a/cryptfs.c
+++ b/cryptfs.c
@@ -59,6 +59,8 @@
#define EXT4_FS 1
#define FAT_FS 2
+#define TABLE_LOAD_RETRIES 10
+
char *me = "cryptfs";
static unsigned char saved_master_key[KEY_LEN_BYTES];
@@ -385,6 +387,7 @@
struct dm_target_spec *tgt;
unsigned int minor;
int fd;
+ int i;
int retval = -1;
if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) {
@@ -427,9 +430,18 @@
crypt_params = (char *) (((unsigned long)crypt_params + 7) & ~8); /* Align to an 8 byte boundary */
tgt->next = crypt_params - buffer;
- if (ioctl(fd, DM_TABLE_LOAD, io)) {
+ for (i = 0; i < TABLE_LOAD_RETRIES; i++) {
+ if (! ioctl(fd, DM_TABLE_LOAD, io)) {
+ break;
+ }
+ usleep(500000);
+ }
+
+ if (i == TABLE_LOAD_RETRIES) {
SLOGE("Cannot load dm-crypt mapping table.\n");
goto errout;
+ } else if (i) {
+ SLOGI("Took %d tries to load dmcrypt table.\n", i + 1);
}
/* Resume this device to activate it */