fs_mgr: introduce fs_mgr_format to format wiped partitionsandroid-cts-5.1_r2android-5.1.1_r9android-5.1.1_r8android-5.1.1_r6android-5.1.1_r4android-5.1.1_r3android-5.1.1_r2android-5.1.1_r13android-5.1.1_r10

Move fastboot's format logic into fs_mgr, to consolidate the knowledge
about how to do this (and when to wipe metadata).

Try to format these formattable paritions if they are wiped.

If formatting fails, we will fall out to let recovery mode handle it.

Bug: 20082763
Change-Id: I397cc197550e78d932e8a154fd234695c46dbe7b

10 files changed, 177 insertions, 7 deletions

diff --git a/fs_mgr/Android.mk b/fs_mgr/Android.mk
index 61bf1ee6a..0ec6c4b1a 100644
--- a/fs_mgr/Android.mk
+++ b/fs_mgr/Android.mk
@@ -4,8 +4,12 @@ LOCAL_PATH:= $(call my-dir)
 include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES:= fs_mgr.c fs_mgr_verity.c fs_mgr_fstab.c
+LOCAL_SRC_FILES += fs_mgr_format.c
 
-LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/include \
+    system/vold \
+    system/extras/ext4_utils \
+    external/openssl/include
 
 LOCAL_MODULE:= libfs_mgr
 LOCAL_STATIC_LIBRARIES := liblogwrap libmincrypt libext4_utils_static
@@ -35,6 +39,7 @@ LOCAL_MODULE_PATH := $(TARGET_ROOT_OUT)/sbin
 LOCAL_UNSTRIPPED_PATH := $(TARGET_ROOT_OUT_UNSTRIPPED)
 
 LOCAL_STATIC_LIBRARIES := libfs_mgr liblogwrap libcutils liblog libc libmincrypt libext4_utils_static
+LOCAL_STATIC_LIBRARIES += libsparse_static libz libselinux
 
 LOCAL_CFLAGS := -Werror
 
diff --git a/fs_mgr/fs_mgr.c b/fs_mgr/fs_mgr.c
index ad029222c..8533ff605 100644
--- a/fs_mgr/fs_mgr.c
+++ b/fs_mgr/fs_mgr.c
@@ -40,6 +40,9 @@
 #include "mincrypt/sha.h"
 #include "mincrypt/sha256.h"
 
+#include "ext4_utils.h"
+#include "wipe.h"
+
 #include "fs_mgr_priv.h"
 #include "fs_mgr_priv_verity.h"
 
@@ -380,6 +383,8 @@ int fs_mgr_mount_all(struct fstab *fstab)
             }
         }
         int last_idx_inspected;
+        int top_idx = i;
+
         mret = mount_with_alternatives(fstab, i, &last_idx_inspected, &attempted_idx);
         i = last_idx_inspected;
         mount_errno = errno;
@@ -409,10 +414,38 @@ int fs_mgr_mount_all(struct fstab *fstab)
             continue;
         }
 
-        /* mount(2) returned an error, check if it's encryptable and deal with it */
+        /* mount(2) returned an error, handle the encryptable/formattable case */
+        bool wiped = partition_wiped(fstab->recs[top_idx].blk_device);
+        if (mret && mount_errno != EBUSY && mount_errno != EACCES &&
+            fs_mgr_is_formattable(&fstab->recs[top_idx]) && wiped) {
+            /* top_idx and attempted_idx point at the same partition, but sometimes
+             * at two different lines in the fstab.  Use the top one for formatting
+             * as that is the preferred one.
+             */
+            ERROR("%s(): %s is wiped and %s %s is formattable. Format it.\n", __func__,
+                  fstab->recs[top_idx].blk_device, fstab->recs[top_idx].mount_point,
+                  fstab->recs[top_idx].fs_type);
+            if (fs_mgr_is_encryptable(&fstab->recs[top_idx]) &&
+                strcmp(fstab->recs[top_idx].key_loc, KEY_IN_FOOTER)) {
+                int fd = open(fstab->recs[top_idx].key_loc, O_WRONLY, 0644);
+                if (fd >= 0) {
+                    INFO("%s(): also wipe %s\n", __func__, fstab->recs[top_idx].key_loc);
+                    wipe_block_device(fd, get_file_size(fd));
+                    close(fd);
+                } else {
+                    ERROR("%s(): %s wouldn't open (%s)\n", __func__,
+                          fstab->recs[top_idx].key_loc, strerror(errno));
+                }
+            }
+            if (fs_mgr_do_format(&fstab->recs[top_idx]) == 0) {
+                /* Let's replay the mount actions. */
+                i = top_idx - 1;
+                continue;
+            }
+        }
         if (mret && mount_errno != EBUSY && mount_errno != EACCES &&
             fs_mgr_is_encryptable(&fstab->recs[attempted_idx])) {
-            if(partition_wiped(fstab->recs[attempted_idx].blk_device)) {
+            if (wiped) {
                 ERROR("%s(): %s is wiped and %s %s is encryptable. Suggest recovery...\n", __func__,
                       fstab->recs[attempted_idx].blk_device, fstab->recs[attempted_idx].mount_point,
                       fstab->recs[attempted_idx].fs_type);
diff --git a/fs_mgr/fs_mgr_format.c b/fs_mgr/fs_mgr_format.c
new file mode 100644
index 000000000..b5b92b53c
--- /dev/null
+++ b/fs_mgr/fs_mgr_format.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/wait.h>
+#include <errno.h>
+#include <cutils/partition_utils.h>
+#include <sys/mount.h>
+#include "ext4_utils.h"
+#include "ext4.h"
+#include "make_ext4fs.h"
+#include "fs_mgr_priv.h"
+
+extern struct fs_info info;     /* magic global from ext4_utils */
+extern void reset_ext4fs_info();
+
+static int format_ext4(char *fs_blkdev, char *fs_mnt_point)
+{
+    unsigned int nr_sec;
+    int fd, rc = 0;
+
+    if ((fd = open(fs_blkdev, O_WRONLY, 0644)) < 0) {
+        ERROR("Cannot open block device.  %s\n", strerror(errno));
+        return -1;
+    }
+
+    if ((ioctl(fd, BLKGETSIZE, &nr_sec)) == -1) {
+        ERROR("Cannot get block device size.  %s\n", strerror(errno));
+        close(fd);
+        return -1;
+    }
+
+    /* Format the partition using the calculated length */
+    reset_ext4fs_info();
+    info.len = ((off64_t)nr_sec * 512);
+
+    /* Use make_ext4fs_internal to avoid wiping an already-wiped partition. */
+    rc = make_ext4fs_internal(fd, NULL, fs_mnt_point, 0, 0, 0, 0, 0, 0, 0, 0, NULL);
+    if (rc) {
+        ERROR("make_ext4fs returned %d.\n", rc);
+    }
+    close(fd);
+
+    return rc;
+}
+
+static int format_f2fs(char *fs_blkdev)
+{
+    char * args[3];
+    int pid;
+    int rc = 0;
+
+    args[0] = (char *)"/sbin/mkfs.f2fs";
+    args[1] = fs_blkdev;
+    args[2] = (char *)0;
+
+    pid = fork();
+    if (pid < 0) {
+       return pid;
+    }
+    if (!pid) {
+        /* This doesn't return */
+        execv("/sbin/mkfs.f2fs", args);
+        exit(1);
+    }
+    for(;;) {
+        pid_t p = waitpid(pid, &rc, 0);
+        if (p != pid) {
+            ERROR("Error waiting for child process - %d\n", p);
+            rc = -1;
+            break;
+        }
+        if (WIFEXITED(rc)) {
+            rc = WEXITSTATUS(rc);
+            INFO("%s done, status %d\n", args[0], rc);
+            if (rc) {
+                rc = -1;
+            }
+            break;
+        }
+        ERROR("Still waiting for %s...\n", args[0]);
+    }
+
+    return rc;
+}
+
+int fs_mgr_do_format(struct fstab_rec *fstab)
+{
+    int rc = -EINVAL;
+
+    ERROR("%s: Format %s as '%s'.\n", __func__, fstab->blk_device, fstab->fs_type);
+
+    if (!strncmp(fstab->fs_type, "f2fs", 4)) {
+        rc = format_f2fs(fstab->blk_device);
+    } else if (!strncmp(fstab->fs_type, "ext4", 4)) {
+        rc = format_ext4(fstab->blk_device, fstab->mount_point);
+    } else {
+        ERROR("File system type '%s' is not supported\n", fstab->fs_type);
+    }
+
+    return rc;
+}
diff --git a/fs_mgr/fs_mgr_fstab.c b/fs_mgr/fs_mgr_fstab.c
index ab8f128ce..edd959116 100644
--- a/fs_mgr/fs_mgr_fstab.c
+++ b/fs_mgr/fs_mgr_fstab.c
@@ -68,6 +68,7 @@ static struct flag_list fs_mgr_flags[] = {
     { "zramsize=",   MF_ZRAMSIZE },
     { "verify",      MF_VERIFY },
     { "noemulatedsd", MF_NOEMULATEDSD },
+    { "formattable", MF_FORMATTABLE },
     { "defaults",    0 },
     { 0,             0 },
 };
@@ -432,3 +433,8 @@ int fs_mgr_is_noemulatedsd(struct fstab_rec *fstab)
 {
     return fstab->fs_mgr_flags & MF_NOEMULATEDSD;
 }
+
+int fs_mgr_is_formattable(struct fstab_rec *fstab)
+{
+    return fstab->fs_mgr_flags & (MF_FORMATTABLE);
+}
diff --git a/fs_mgr/fs_mgr_priv.h b/fs_mgr/fs_mgr_priv.h
index 34938fad7..fd5830652 100644
--- a/fs_mgr/fs_mgr_priv.h
+++ b/fs_mgr/fs_mgr_priv.h
@@ -75,6 +75,7 @@
 #define MF_FORCECRYPT   0x400
 #define MF_NOEMULATEDSD 0x800 /* no emulated sdcard daemon, sd card is the only
                                  external storage */
+#define MF_FORMATTABLE  0x1000
 
 #define DM_BUF_SIZE 4096
 
diff --git a/fs_mgr/include/fs_mgr.h b/fs_mgr/include/fs_mgr.h
index 5e2ff416a..5a6ad2d60 100644
--- a/fs_mgr/include/fs_mgr.h
+++ b/fs_mgr/include/fs_mgr.h
@@ -84,7 +84,11 @@ int fs_mgr_is_nonremovable(struct fstab_rec *fstab);
 int fs_mgr_is_verified(struct fstab_rec *fstab);
 int fs_mgr_is_encryptable(struct fstab_rec *fstab);
 int fs_mgr_is_noemulatedsd(struct fstab_rec *fstab);
+int fs_mgr_is_formattable(struct fstab_rec *fstab);
 int fs_mgr_swapon_all(struct fstab *fstab);
+
+int fs_mgr_do_format(struct fstab_rec *fstab);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/init/Android.mk b/init/Android.mk
index 489dc93e1..228e645e9 100644
--- a/init/Android.mk
+++ b/init/Android.mk
@@ -45,7 +45,9 @@ LOCAL_STATIC_LIBRARIES := \
 	libc \
 	libselinux \
 	libmincrypt \
-	libext4_utils_static
+	libext4_utils_static \
+	libsparse_static \
+	libz
 
 LOCAL_ADDITIONAL_DEPENDENCIES += $(LOCAL_PATH)/Android.mk
 
diff --git a/init/devices.c b/init/devices.c
index 1012fee41..73fe223a2 100644
--- a/init/devices.c
+++ b/init/devices.c
@@ -564,7 +564,7 @@ static void handle_device(const char *action, const char *devpath,
         make_device(devpath, path, block, major, minor, (const char **)links);
         if (links) {
             for (i = 0; links[i]; i++)
-                make_link(devpath, links[i]);
+                make_link_init(devpath, links[i]);
         }
     }
 
diff --git a/init/util.c b/init/util.c
index e1a3ee33a..12cb11d66 100644
--- a/init/util.c
+++ b/init/util.c
@@ -335,7 +335,7 @@ void sanitize(char *s)
     }
 }
 
-void make_link(const char *oldpath, const char *newpath)
+void make_link_init(const char *oldpath, const char *newpath)
 {
     int ret;
     char buf[256];
diff --git a/init/util.h b/init/util.h
index 04b8129ba..a7e7c8b20 100644
--- a/init/util.h
+++ b/init/util.h
@@ -33,7 +33,7 @@ unsigned int decode_uid(const char *s);
 
 int mkdir_recursive(const char *pathname, mode_t mode);
 void sanitize(char *p);
-void make_link(const char *oldpath, const char *newpath);
+void make_link_init(const char *oldpath, const char *newpath);
 void remove_link(const char *oldpath, const char *newpath);
 int wait_for_file(const char *filename, int timeout);
 void open_devnull_stdio(void);