[fshost] Rename BlockWatcher to FilesystemMounter

This object isn't actually doing any watching; it's just holding
filesystem state including "FsManager".

Change-Id: Ia7e79f161d52680e6a0f71d77995712efe6460a6
diff --git a/zircon/system/core/devmgr/fshost/block-watcher.cpp b/zircon/system/core/devmgr/fshost/block-watcher.cpp
index 7b01d76..8c9b4e3 100644
--- a/zircon/system/core/devmgr/fshost/block-watcher.cpp
+++ b/zircon/system/core/devmgr/fshost/block-watcher.cpp
@@ -68,7 +68,7 @@
 // GUID of the device does not match a known valid one. Returns
 // ZX_ERR_NOT_SUPPORTED if the GUID is a system GUID. Returns ZX_OK if an
 // attempt to mount is made, without checking mount success.
-zx_status_t MountMinfs(BlockWatcher* watcher, fbl::unique_fd fd, mount_options_t* options) {
+zx_status_t MountMinfs(FilesystemMounter* filesystems, fbl::unique_fd fd, mount_options_t* options) {
     fuchsia_hardware_block_partition_GUID type_guid;
     {
         fzl::UnownedFdioCaller disk_connection(fd.get());
@@ -85,9 +85,9 @@
     if (gpt_is_sys_guid(type_guid.value, GPT_GUID_LEN)) {
         return ZX_ERR_NOT_SUPPORTED;
     } else if (gpt_is_data_guid(type_guid.value, GPT_GUID_LEN)) {
-        return watcher->MountData(std::move(fd), options);
+        return filesystems->MountData(std::move(fd), options);
     } else if (gpt_is_install_guid(type_guid.value, GPT_GUID_LEN)) {
-        return watcher->MountInstall(std::move(fd), options);
+        return filesystems->MountInstall(std::move(fd), options);
     }
     printf("fshost: Unrecognized partition GUID for minfs; not mounting\n");
     return ZX_ERR_INVALID_ARGS;
@@ -150,7 +150,7 @@
 }
 
 zx_status_t BlockDeviceAdded(int dirfd, int event, const char* name, void* cookie) {
-    auto watcher = static_cast<BlockWatcher*>(cookie);
+    auto filesystems = static_cast<FilesystemMounter*>(cookie);
 
     if (event != WATCH_EVENT_ADD_FILE) {
         return ZX_OK;
@@ -206,7 +206,7 @@
             return ZX_OK;
         }
         case DISK_FORMAT_ZXCRYPT: {
-            if (!watcher->Netbooting()) {
+            if (!filesystems->Netbooting()) {
                 printf("fshost: %s: zxcrypt?\n", device_path);
                 // Bind and unseal the driver from a separate thread, since we
                 // have to wait for a number of devices to do I/O and settle,
@@ -242,11 +242,11 @@
 
     // If we're in netbooting mode, then only bind drivers for partition
     // containers and the install partition, not regular filesystems.
-    if (watcher->Netbooting()) {
+    if (filesystems->Netbooting()) {
         if (gpt_is_install_guid(guid.value, GPT_GUID_LEN)) {
             printf("fshost: mounting install partition\n");
             mount_options_t options = default_mount_options;
-            MountMinfs(watcher, std::move(fd), &options);
+            MountMinfs(filesystems, std::move(fd), &options);
             return ZX_OK;
         }
 
@@ -262,32 +262,32 @@
         }
         fsck_options_t fsck_options = default_fsck_options;
         fsck_options.apply_journal = true;
-        if (watcher->CheckFilesystem(device_path, DISK_FORMAT_BLOBFS, &fsck_options) != ZX_OK) {
+        if (filesystems->CheckFilesystem(device_path, DISK_FORMAT_BLOBFS, &fsck_options) != ZX_OK) {
             return ZX_OK;
         }
 
         mount_options_t options = default_mount_options;
         options.enable_journal = true;
         options.collect_metrics = true;
-        zx_status_t status = watcher->MountBlob(std::move(fd), &options);
+        zx_status_t status = filesystems->MountBlob(std::move(fd), &options);
         if (status != ZX_OK) {
             printf("fshost: Failed to mount blobfs partition %s at %s: %s.\n", device_path,
                    PATH_BLOB, zx_status_get_string(status));
         } else {
-            LaunchBlobInit(watcher);
+            LaunchBlobInit(filesystems);
         }
         return ZX_OK;
     }
     case DISK_FORMAT_MINFS: {
         printf("fshost: mounting minfs\n");
         fsck_options_t fsck_options = default_fsck_options;
-        if (watcher->CheckFilesystem(device_path, DISK_FORMAT_MINFS, &fsck_options) != ZX_OK) {
+        if (filesystems->CheckFilesystem(device_path, DISK_FORMAT_MINFS, &fsck_options) != ZX_OK) {
             if (FormatMinfs(fd, info) != ZX_OK) {
                 return ZX_OK;
             }
         }
         mount_options_t options = default_mount_options;
-        MountMinfs(watcher, std::move(fd), &options);
+        MountMinfs(filesystems, std::move(fd), &options);
         return ZX_OK;
     }
     case DISK_FORMAT_FAT: {
@@ -314,7 +314,7 @@
 
 } // namespace
 
-zx_status_t BlockWatcher::MountData(fbl::unique_fd fd, mount_options_t* options) {
+zx_status_t FilesystemMounter::MountData(fbl::unique_fd fd, mount_options_t* options) {
     if (data_mounted_) {
         return ZX_ERR_ALREADY_BOUND;
     }
@@ -330,7 +330,7 @@
     return status;
 }
 
-zx_status_t BlockWatcher::MountInstall(fbl::unique_fd fd, mount_options_t* options) {
+zx_status_t FilesystemMounter::MountInstall(fbl::unique_fd fd, mount_options_t* options) {
     if (install_mounted_) {
         return ZX_ERR_ALREADY_BOUND;
     }
@@ -345,7 +345,7 @@
     return status;
 }
 
-zx_status_t BlockWatcher::MountBlob(fbl::unique_fd fd, mount_options_t* options) {
+zx_status_t FilesystemMounter::MountBlob(fbl::unique_fd fd, mount_options_t* options) {
     if (blob_mounted_) {
         return ZX_ERR_ALREADY_BOUND;
     }
@@ -359,7 +359,7 @@
     return status;
 }
 
-zx_status_t BlockWatcher::CheckFilesystem(const char* device_path, disk_format_t df,
+zx_status_t FilesystemMounter::CheckFilesystem(const char* device_path, disk_format_t df,
                                           const fsck_options_t* options) const {
     if (!getenv_bool("zircon.system.filesystem-check", false)) {
         return ZX_OK;
@@ -437,11 +437,11 @@
 }
 
 void BlockDeviceWatcher(std::unique_ptr<FsManager> fshost, bool netboot) {
-    BlockWatcher watcher(std::move(fshost), netboot);
+    FilesystemMounter filesystems(std::move(fshost), netboot);
 
     fbl::unique_fd dirfd(open("/dev/class/block", O_DIRECTORY | O_RDONLY));
     if (dirfd) {
-        fdio_watch_directory(dirfd.get(), BlockDeviceAdded, ZX_TIME_INFINITE, &watcher);
+        fdio_watch_directory(dirfd.get(), BlockDeviceAdded, ZX_TIME_INFINITE, &filesystems);
     }
 }
 
diff --git a/zircon/system/core/devmgr/fshost/block-watcher.h b/zircon/system/core/devmgr/fshost/block-watcher.h
index 3a30e23..d4c01a54 100644
--- a/zircon/system/core/devmgr/fshost/block-watcher.h
+++ b/zircon/system/core/devmgr/fshost/block-watcher.h
@@ -15,9 +15,9 @@
 
 namespace devmgr {
 
-class BlockWatcher {
+class FilesystemMounter {
 public:
-    BlockWatcher(std::unique_ptr<FsManager> fshost, bool netboot)
+    FilesystemMounter(std::unique_ptr<FsManager> fshost, bool netboot)
         : fshost_(std::move(fshost)), netboot_(netboot) {}
 
     void FuchsiaStart() const { fshost_->FuchsiaStart(); }
diff --git a/zircon/system/core/devmgr/fshost/main.cpp b/zircon/system/core/devmgr/fshost/main.cpp
index 8488770..b4391dd 100644
--- a/zircon/system/core/devmgr/fshost/main.cpp
+++ b/zircon/system/core/devmgr/fshost/main.cpp
@@ -206,13 +206,13 @@
     // Setup the devmgr loader service.
     devmgr::setup_loader_service(std::move(devmgr_loader));
 
-    // If there is a ramdisk, setup the ramctl watcher.
+    // If there is a ramdisk, setup the ramctl filesystems.
     zx::vmo ramdisk_vmo(zx_take_startup_handle(PA_HND(PA_VMO_BOOTDATA, 0)));
     if (ramdisk_vmo.is_valid()) {
         thrd_t t;
-        int err = thrd_create_with_name(&t, &devmgr::RamctlWatcher, &ramdisk_vmo, "ramctl-watcher");
+        int err = thrd_create_with_name(&t, &devmgr::RamctlWatcher, &ramdisk_vmo, "ramctl-filesystems");
         if (err != thrd_success) {
-            printf("fshost: failed to start ramctl-watcher: %d\n", err);
+            printf("fshost: failed to start ramctl-filesystems: %d\n", err);
         }
         thrd_detach(t);
     }
@@ -224,6 +224,6 @@
         // to the devmgr. Otherwise the devmgr will segfault.
         zx::nanosleep(zx::time::infinite());
     }
-    printf("fshost: terminating (block device watcher finished?)\n");
+    printf("fshost: terminating (block device filesystems finished?)\n");
     return 0;
 }
diff --git a/zircon/system/core/devmgr/fshost/pkgfs-launcher.cpp b/zircon/system/core/devmgr/fshost/pkgfs-launcher.cpp
index 97bda18..25c7ce0 100644
--- a/zircon/system/core/devmgr/fshost/pkgfs-launcher.cpp
+++ b/zircon/system/core/devmgr/fshost/pkgfs-launcher.cpp
@@ -27,7 +27,7 @@
 namespace devmgr {
 namespace {
 
-void pkgfs_finish(BlockWatcher* watcher, zx::process proc, zx::channel pkgfs_root) {
+void pkgfs_finish(FilesystemMounter* filesystems, zx::process proc, zx::channel pkgfs_root) {
     auto deadline = zx::deadline_after(zx::sec(5));
     zx_signals_t observed;
     zx_status_t status =
@@ -60,20 +60,20 @@
         // non-fatal.
         printf("fshost: failed to install /bin (could not open shell-commands)\n");
     }
-    if (watcher->InstallFs("/pkgfs", std::move(pkgfs_root)) != ZX_OK) {
+    if (filesystems->InstallFs("/pkgfs", std::move(pkgfs_root)) != ZX_OK) {
         printf("fshost: failed to install /pkgfs\n");
         return;
     }
-    if (watcher->InstallFs("/system", std::move(system_channel)) != ZX_OK) {
+    if (filesystems->InstallFs("/system", std::move(system_channel)) != ZX_OK) {
         printf("fshost: failed to install /system\n");
         return;
     }
     // as above, failure of /bin export is non-fatal.
-    if (watcher->InstallFs("/bin", std::move(bin_chan)) != ZX_OK) {
+    if (filesystems->InstallFs("/bin", std::move(bin_chan)) != ZX_OK) {
         printf("fshost: failed to install /bin\n");
     }
     // start the appmgr
-    watcher->FuchsiaStart();
+    filesystems->FuchsiaStart();
 }
 
 // Launching pkgfs uses its own loader service and command lookup to run out of
@@ -165,7 +165,7 @@
     return status;
 }
 
-bool pkgfs_launch(BlockWatcher* watcher) {
+bool pkgfs_launch(FilesystemMounter* filesystems) {
     const char* cmd = getenv("zircon.system.pkgfs.cmd");
     if (cmd == nullptr) {
         return false;
@@ -222,14 +222,14 @@
         return false;
     }
 
-    pkgfs_finish(watcher, std::move(proc), std::move(h0));
+    pkgfs_finish(filesystems, std::move(proc), std::move(h0));
     return true;
 }
 
 } // namespace
 
-void LaunchBlobInit(BlockWatcher* watcher) {
-    pkgfs_launch(watcher);
+void LaunchBlobInit(FilesystemMounter* filesystems) {
+    pkgfs_launch(filesystems);
 }
 
 } // namespace devmgr
diff --git a/zircon/system/core/devmgr/fshost/pkgfs-launcher.h b/zircon/system/core/devmgr/fshost/pkgfs-launcher.h
index 03d4a38..aa8f01b 100644
--- a/zircon/system/core/devmgr/fshost/pkgfs-launcher.h
+++ b/zircon/system/core/devmgr/fshost/pkgfs-launcher.h
@@ -9,6 +9,6 @@
 namespace devmgr {
 
 // Launches pkgfs from within blobfs by parsing environment variables.
-void LaunchBlobInit(BlockWatcher* watcher);
+void LaunchBlobInit(FilesystemMounter* filesystems);
 
 } // namespace devmgr