Move to using the new unified fstab in recovery.

Instead of reading it's own fstab, have recovery invoke
fs_mgr to read the unified fstab.

Change-Id: I80c75d2c53b809ac60a4a69f0ef7ebfa707c39e9

4 files changed, 55 insertions, 149 deletions

diff --git a/Android.mk b/Android.mk
index f4ecdb5..35151ee 100644
--- a/Android.mk
+++ b/Android.mk
@@ -32,6 +32,7 @@ LOCAL_MODULE := recovery
 LOCAL_FORCE_STATIC_EXECUTABLE := true
 
 RECOVERY_API_VERSION := 3
+RECOVERY_FSTAB_VERSION := 2
 LOCAL_CFLAGS += -DRECOVERY_API_VERSION=$(RECOVERY_API_VERSION)
 
 LOCAL_STATIC_LIBRARIES := \
@@ -45,6 +46,7 @@ LOCAL_STATIC_LIBRARIES := \
     libminui \
     libpixelflinger_static \
     libpng \
+    libfs_mgr \
     libcutils \
     libselinux \
     libstdc++ \
diff --git a/bootloader.cpp b/bootloader.cpp
index baaddc5..600d238 100644
--- a/bootloader.cpp
+++ b/bootloader.cpp
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include <fs_mgr.h>
 #include "bootloader.h"
 #include "common.h"
 #include "mtdutils/mtdutils.h"
@@ -71,22 +72,22 @@ static int get_bootloader_message_mtd(struct bootloader_message *out,
                                       const Volume* v) {
     size_t write_size;
     mtd_scan_partitions();
-    const MtdPartition *part = mtd_find_partition_by_name(v->device);
+    const MtdPartition *part = mtd_find_partition_by_name(v->blk_device);
     if (part == NULL || mtd_partition_info(part, NULL, NULL, &write_size)) {
-        LOGE("Can't find %s\n", v->device);
+        LOGE("Can't find %s\n", v->blk_device);
         return -1;
     }
 
     MtdReadContext *read = mtd_read_partition(part);
     if (read == NULL) {
-        LOGE("Can't open %s\n(%s)\n", v->device, strerror(errno));
+        LOGE("Can't open %s\n(%s)\n", v->blk_device, strerror(errno));
         return -1;
     }
 
     const ssize_t size = write_size * MISC_PAGES;
     char data[size];
     ssize_t r = mtd_read_data(read, data, size);
-    if (r != size) LOGE("Can't read %s\n(%s)\n", v->device, strerror(errno));
+    if (r != size) LOGE("Can't read %s\n(%s)\n", v->blk_device, strerror(errno));
     mtd_read_close(read);
     if (r != size) return -1;
 
@@ -97,22 +98,22 @@ static int set_bootloader_message_mtd(const struct bootloader_message *in,
                                       const Volume* v) {
     size_t write_size;
     mtd_scan_partitions();
-    const MtdPartition *part = mtd_find_partition_by_name(v->device);
+    const MtdPartition *part = mtd_find_partition_by_name(v->blk_device);
     if (part == NULL || mtd_partition_info(part, NULL, NULL, &write_size)) {
-        LOGE("Can't find %s\n", v->device);
+        LOGE("Can't find %s\n", v->blk_device);
         return -1;
     }
 
     MtdReadContext *read = mtd_read_partition(part);
     if (read == NULL) {
-        LOGE("Can't open %s\n(%s)\n", v->device, strerror(errno));
+        LOGE("Can't open %s\n(%s)\n", v->blk_device, strerror(errno));
         return -1;
     }
 
     ssize_t size = write_size * MISC_PAGES;
     char data[size];
     ssize_t r = mtd_read_data(read, data, size);
-    if (r != size) LOGE("Can't read %s\n(%s)\n", v->device, strerror(errno));
+    if (r != size) LOGE("Can't read %s\n(%s)\n", v->blk_device, strerror(errno));
     mtd_read_close(read);
     if (r != size) return -1;
 
@@ -120,16 +121,16 @@ static int set_bootloader_message_mtd(const struct bootloader_message *in,
 
     MtdWriteContext *write = mtd_write_partition(part);
     if (write == NULL) {
-        LOGE("Can't open %s\n(%s)\n", v->device, strerror(errno));
+        LOGE("Can't open %s\n(%s)\n", v->blk_device, strerror(errno));
         return -1;
     }
     if (mtd_write_data(write, data, size) != size) {
-        LOGE("Can't write %s\n(%s)\n", v->device, strerror(errno));
+        LOGE("Can't write %s\n(%s)\n", v->blk_device, strerror(errno));
         mtd_write_close(write);
         return -1;
     }
     if (mtd_write_close(write)) {
-        LOGE("Can't finish %s\n(%s)\n", v->device, strerror(errno));
+        LOGE("Can't finish %s\n(%s)\n", v->blk_device, strerror(errno));
         return -1;
     }
 
@@ -161,20 +162,20 @@ static void wait_for_device(const char* fn) {
 
 static int get_bootloader_message_block(struct bootloader_message *out,
                                         const Volume* v) {
-    wait_for_device(v->device);
-    FILE* f = fopen(v->device, "rb");
+    wait_for_device(v->blk_device);
+    FILE* f = fopen(v->blk_device, "rb");
     if (f == NULL) {
-        LOGE("Can't open %s\n(%s)\n", v->device, strerror(errno));
+        LOGE("Can't open %s\n(%s)\n", v->blk_device, strerror(errno));
         return -1;
     }
     struct bootloader_message temp;
     int count = fread(&temp, sizeof(temp), 1, f);
     if (count != 1) {
-        LOGE("Failed reading %s\n(%s)\n", v->device, strerror(errno));
+        LOGE("Failed reading %s\n(%s)\n", v->blk_device, strerror(errno));
         return -1;
     }
     if (fclose(f) != 0) {
-        LOGE("Failed closing %s\n(%s)\n", v->device, strerror(errno));
+        LOGE("Failed closing %s\n(%s)\n", v->blk_device, strerror(errno));
         return -1;
     }
     memcpy(out, &temp, sizeof(temp));
@@ -183,19 +184,19 @@ static int get_bootloader_message_block(struct bootloader_message *out,
 
 static int set_bootloader_message_block(const struct bootloader_message *in,
                                         const Volume* v) {
-    wait_for_device(v->device);
-    FILE* f = fopen(v->device, "wb");
+    wait_for_device(v->blk_device);
+    FILE* f = fopen(v->blk_device, "wb");
     if (f == NULL) {
-        LOGE("Can't open %s\n(%s)\n", v->device, strerror(errno));
+        LOGE("Can't open %s\n(%s)\n", v->blk_device, strerror(errno));
         return -1;
     }
     int count = fwrite(in, sizeof(*in), 1, f);
     if (count != 1) {
-        LOGE("Failed writing %s\n(%s)\n", v->device, strerror(errno));
+        LOGE("Failed writing %s\n(%s)\n", v->blk_device, strerror(errno));
         return -1;
     }
     if (fclose(f) != 0) {
-        LOGE("Failed closing %s\n(%s)\n", v->device, strerror(errno));
+        LOGE("Failed closing %s\n(%s)\n", v->blk_device, strerror(errno));
         return -1;
     }
     return 0;
diff --git a/common.h b/common.h
index a1168cd..3587a31 100644
--- a/common.h
+++ b/common.h
@@ -39,24 +39,7 @@ extern "C" {
 #define STRINGIFY(x) #x
 #define EXPAND(x) STRINGIFY(x)
 
-typedef struct {
-    const char* mount_point;  // eg. "/cache".  must live in the root directory.
-
-    const char* fs_type;      // "yaffs2" or "ext4" or "vfat"
-
-    const char* device;       // MTD partition name if fs_type == "yaffs"
-                              // block device if fs_type == "ext4" or "vfat"
-
-    const char* device2;      // alternative device to try if fs_type
-                              // == "ext4" or "vfat" and mounting
-                              // 'device' fails
-
-    long long length;         // (ext4 partition only) when
-                              // formatting, size to use for the
-                              // partition.  0 or negative number
-                              // means to format all but the last
-                              // (that much).
-} Volume;
+typedef struct fstab_rec Volume;
 
 // fopen a file, mounting volumes and making parent dirs as necessary.
 FILE* fopen_path(const char *path, const char *mode);
diff --git a/roots.cpp b/roots.cpp
index ca37cf1..0947122 100644
--- a/roots.cpp
+++ b/roots.cpp
@@ -22,120 +22,48 @@
 #include <unistd.h>
 #include <ctype.h>
 
+#include <fs_mgr.h>
 #include "mtdutils/mtdutils.h"
 #include "mtdutils/mounts.h"
 #include "roots.h"
 #include "common.h"
 #include "make_ext4fs.h"
 
-static int num_volumes = 0;
-static Volume* device_volumes = NULL;
+static struct fstab *fstab = NULL;
 
 extern struct selabel_handle *sehandle;
 
-static int parse_options(char* options, Volume* volume) {
-    char* option;
-    while ((option = strtok(options, ","))) {
-        options = NULL;
-
-        if (strncmp(option, "length=", 7) == 0) {
-            volume->length = strtoll(option+7, NULL, 10);
-        } else {
-            LOGE("bad option \"%s\"\n", option);
-            return -1;
-        }
-    }
-    return 0;
-}
-
-void load_volume_table() {
-    int alloc = 2;
-    device_volumes = (Volume*)malloc(alloc * sizeof(Volume));
-
-    // Insert an entry for /tmp, which is the ramdisk and is always mounted.
-    device_volumes[0].mount_point = "/tmp";
-    device_volumes[0].fs_type = "ramdisk";
-    device_volumes[0].device = NULL;
-    device_volumes[0].device2 = NULL;
-    device_volumes[0].length = 0;
-    num_volumes = 1;
+void load_volume_table()
+{
+    int i;
+    int ret;
 
-    FILE* fstab = fopen("/etc/recovery.fstab", "r");
-    if (fstab == NULL) {
-        LOGE("failed to open /etc/recovery.fstab (%s)\n", strerror(errno));
+    fstab = fs_mgr_read_fstab("/etc/recovery.fstab");
+    if (!fstab) {
+        LOGE("failed to read /etc/recovery.fstab\n");
         return;
     }
 
-    char buffer[1024];
-    int i;
-    while (fgets(buffer, sizeof(buffer)-1, fstab)) {
-        for (i = 0; buffer[i] && isspace(buffer[i]); ++i);
-        if (buffer[i] == '\0' || buffer[i] == '#') continue;
-
-        char* original = strdup(buffer);
-
-        char* mount_point = strtok(buffer+i, " \t\n");
-        char* fs_type = strtok(NULL, " \t\n");
-        char* device = strtok(NULL, " \t\n");
-        // lines may optionally have a second device, to use if
-        // mounting the first one fails.
-        char* options = NULL;
-        char* device2 = strtok(NULL, " \t\n");
-        if (device2) {
-            if (device2[0] == '/') {
-                options = strtok(NULL, " \t\n");
-            } else {
-                options = device2;
-                device2 = NULL;
-            }
-        }
-
-        if (mount_point && fs_type && device) {
-            while (num_volumes >= alloc) {
-                alloc *= 2;
-                device_volumes = (Volume*)realloc(device_volumes, alloc*sizeof(Volume));
-            }
-            device_volumes[num_volumes].mount_point = strdup(mount_point);
-            device_volumes[num_volumes].fs_type = strdup(fs_type);
-            device_volumes[num_volumes].device = strdup(device);
-            device_volumes[num_volumes].device2 =
-                device2 ? strdup(device2) : NULL;
-
-            device_volumes[num_volumes].length = 0;
-            if (parse_options(options, device_volumes + num_volumes) != 0) {
-                LOGE("skipping malformed recovery.fstab line: %s\n", original);
-            } else {
-                ++num_volumes;
-            }
-        } else {
-            LOGE("skipping malformed recovery.fstab line: %s\n", original);
-        }
-        free(original);
+    ret = fs_mgr_add_entry(fstab, "/tmp", "ramdisk", "ramdisk", 0);
+    if (ret < 0 ) {
+        LOGE("failed to add /tmp entry to fstab\n");
+        fs_mgr_free_fstab(fstab);
+        fstab = NULL;
+        return;
     }
 
-    fclose(fstab);
-
     printf("recovery filesystem table\n");
     printf("=========================\n");
-    for (i = 0; i < num_volumes; ++i) {
-        Volume* v = &device_volumes[i];
-        printf("  %d %s %s %s %s %lld\n", i, v->mount_point, v->fs_type,
-               v->device, v->device2, v->length);
+    for (i = 0; i < fstab->num_entries; ++i) {
+        Volume* v = &fstab->recs[i];
+        printf("  %d %s %s %s %lld\n", i, v->mount_point, v->fs_type,
+               v->blk_device, v->length);
     }
     printf("\n");
 }
 
 Volume* volume_for_path(const char* path) {
-    int i;
-    for (i = 0; i < num_volumes; ++i) {
-        Volume* v = device_volumes+i;
-        int len = strlen(v->mount_point);
-        if (strncmp(path, v->mount_point, len) == 0 &&
-            (path[len] == '\0' || path[len] == '/')) {
-            return v;
-        }
-    }
-    return NULL;
+    return fs_mgr_get_entry_for_mount_point(fstab, path);
 }
 
 int ensure_path_mounted(const char* path) {
@@ -169,27 +97,19 @@ int ensure_path_mounted(const char* path) {
         // mount an MTD partition as a YAFFS2 filesystem.
         mtd_scan_partitions();
         const MtdPartition* partition;
-        partition = mtd_find_partition_by_name(v->device);
+        partition = mtd_find_partition_by_name(v->blk_device);
         if (partition == NULL) {
             LOGE("failed to find \"%s\" partition to mount at \"%s\"\n",
-                 v->device, v->mount_point);
+                 v->blk_device, v->mount_point);
             return -1;
         }
         return mtd_mount_partition(partition, v->mount_point, v->fs_type, 0);
     } else if (strcmp(v->fs_type, "ext4") == 0 ||
                strcmp(v->fs_type, "vfat") == 0) {
-        result = mount(v->device, v->mount_point, v->fs_type,
+        result = mount(v->blk_device, v->mount_point, v->fs_type,
                        MS_NOATIME | MS_NODEV | MS_NODIRATIME, "");
         if (result == 0) return 0;
 
-        if (v->device2) {
-            LOGW("failed to mount %s (%s); trying %s\n",
-                 v->device, strerror(errno), v->device2);
-            result = mount(v->device2, v->mount_point, v->fs_type,
-                           MS_NOATIME | MS_NODEV | MS_NODIRATIME, "");
-            if (result == 0) return 0;
-        }
-
         LOGE("failed to mount %s (%s)\n", v->mount_point, strerror(errno));
         return -1;
     }
@@ -249,31 +169,31 @@ int format_volume(const char* volume) {
 
     if (strcmp(v->fs_type, "yaffs2") == 0 || strcmp(v->fs_type, "mtd") == 0) {
         mtd_scan_partitions();
-        const MtdPartition* partition = mtd_find_partition_by_name(v->device);
+        const MtdPartition* partition = mtd_find_partition_by_name(v->blk_device);
         if (partition == NULL) {
-            LOGE("format_volume: no MTD partition \"%s\"\n", v->device);
+            LOGE("format_volume: no MTD partition \"%s\"\n", v->blk_device);
             return -1;
         }
 
         MtdWriteContext *write = mtd_write_partition(partition);
         if (write == NULL) {
-            LOGW("format_volume: can't open MTD \"%s\"\n", v->device);
+            LOGW("format_volume: can't open MTD \"%s\"\n", v->blk_device);
             return -1;
         } else if (mtd_erase_blocks(write, -1) == (off_t) -1) {
-            LOGW("format_volume: can't erase MTD \"%s\"\n", v->device);
+            LOGW("format_volume: can't erase MTD \"%s\"\n", v->blk_device);
             mtd_write_close(write);
             return -1;
         } else if (mtd_write_close(write)) {
-            LOGW("format_volume: can't close MTD \"%s\"\n", v->device);
+            LOGW("format_volume: can't close MTD \"%s\"\n", v->blk_device);
             return -1;
         }
         return 0;
     }
 
     if (strcmp(v->fs_type, "ext4") == 0) {
-        int result = make_ext4fs(v->device, v->length, volume, sehandle);
+        int result = make_ext4fs(v->blk_device, v->length, volume, sehandle);
         if (result != 0) {
-            LOGE("format_volume: make_extf4fs failed on %s\n", v->device);
+            LOGE("format_volume: make_extf4fs failed on %s\n", v->blk_device);
             return -1;
         }
         return 0;