Merge "fs_mgr: Add support for A/B partitions"

fs_mgr/fs_mgr_fstab.c

@@ -20,6 +20,8 @@
 #include <string.h>
 #include <sys/mount.h>
 
+#include <cutils/properties.h>
+
 #include "fs_mgr_priv.h"
 
 struct fs_mgr_flag_values {
@@ -70,6 +72,7 @@ static struct flag_list fs_mgr_flags[] = {
     { "zramsize=",   MF_ZRAMSIZE },
     { "verify",      MF_VERIFY },
     { "noemulatedsd", MF_NOEMULATEDSD },
+    { "slotselect",  MF_SLOTSELECT },
     { "defaults",    0 },
     { 0,             0 },
 };
@@ -307,6 +310,23 @@ struct fstab *fs_mgr_read_fstab(const char *fstab_path)
         fstab->recs[cnt].partnum = flag_vals.partnum;
         fstab->recs[cnt].swap_prio = flag_vals.swap_prio;
         fstab->recs[cnt].zram_size = flag_vals.zram_size;
+
+        /* If an A/B partition, modify block device to be the real block device */
+        if (fstab->recs[cnt].fs_mgr_flags & MF_SLOTSELECT) {
+            char propbuf[PROPERTY_VALUE_MAX];
+            char *tmp;
+
+            /* use the kernel parameter if set */
+            property_get("ro.boot.slot_suffix", propbuf, "");
+
+            if (asprintf(&tmp, "%s%s", fstab->recs[cnt].blk_device, propbuf) > 0) {
+                free(fstab->recs[cnt].blk_device);
+                fstab->recs[cnt].blk_device = tmp;
+            } else {
+                ERROR("Error updating block device name\n");
+                goto err;
+            }
+        }
         cnt++;
     }
     fclose(fstab_file);
@@ -448,3 +468,8 @@ int fs_mgr_is_noemulatedsd(const struct fstab_rec *fstab)
 {
     return fstab->fs_mgr_flags & MF_NOEMULATEDSD;
 }
+
+int fs_mgr_is_slotselect(struct fstab_rec *fstab)
+{
+    return fstab->fs_mgr_flags & MF_SLOTSELECT;
+}

fs_mgr/fs_mgr_priv.h

@@ -77,6 +77,7 @@
 #define MF_NOEMULATEDSD 0x800 /* no emulated sdcard daemon, sd card is the only
                                  external storage */
 #define MF_FILEENCRYPTION 0x2000
+#define MF_SLOTSELECT   0x8000
 
 #define DM_BUF_SIZE 4096