* TODO: Licensing
*/
+#include <stdio.h>
#include <stdint.h>
+#include <inttypes.h>
#include <glib.h>
#include <string.h>
-#include "bluesky.h"
+#include "bluesky-private.h"
/* Core filesystem. Different proxies, such as the NFSv3 one, interface to
* this, but the core actually tracks the data which is stored. So far we just
/* Update an inode to indicate that a modification was made. This increases
* the change counter, updates the ctime to the current time, and optionally
- * updates the mtime. */
+ * updates the mtime. This also makes the inode contents subject to writeback
+ * to storage in the future. inode must already be locked. */
void bluesky_inode_update_ctime(BlueSkyInode *inode, gboolean update_mtime)
{
int64_t now = bluesky_get_current_time();
inode->ctime = now;
if (update_mtime)
inode->mtime = now;
+
+ if (inode->change_time == 0)
+ inode->change_time = now;
+
+ if (bluesky_options.writethrough_cache)
+ bluesky_file_flush(inode, NULL);
}
/* Unfortunately a glib hash table is only guaranteed to be able to store
return fs;
}
+BlueSkyFS *bluesky_init_fs(gchar *name, BlueSkyStore *store)
+{
+ BlueSkyRCStr *data = bluesky_store_get(store, "superblock");
+ if (data != NULL) {
+ BlueSkyFS *fs = bluesky_deserialize_superblock(data->data);
+ if (fs != NULL) {
+ fs->store = store;
+ g_print("Loaded filesystem superblock\n");
+ g_free(fs->name);
+ fs->name = g_strdup(name);
+ return fs;
+ }
+ }
+
+ g_print("Initializing fresh filesystem\n");
+ BlueSkyFS *fs = bluesky_new_fs(name);
+ fs->store = store;
+
+ BlueSkyInode *root = bluesky_new_inode(BLUESKY_ROOT_INUM, fs,
+ BLUESKY_DIRECTORY);
+ root->nlink = 1;
+ root->mode = 0755;
+ bluesky_insert_inode(fs, root);
+
+ bluesky_inode_flush(fs, root);
+ bluesky_superblock_flush(fs);
+
+ return fs;
+}
+
/* Inode reference counting. */
void bluesky_inode_ref(BlueSkyInode *inode)
{
void bluesky_inode_unref(BlueSkyInode *inode)
{
if (g_atomic_int_dec_and_test(&inode->refcount)) {
- g_error("Reference count for inode %lld dropped to zero!\n",
+ g_error("Reference count for inode %"PRIu64" dropped to zero!\n",
inode->inum);
}
}
/* Allocate a fresh inode number which has not been used before within a
- * filesystem. */
+ * filesystem. fs must already be locked. */
uint64_t bluesky_fs_alloc_inode(BlueSkyFS *fs)
{
uint64_t inum;
- g_mutex_lock(fs->lock);
inum = fs->next_inum;
fs->next_inum++;
- g_mutex_unlock(fs->lock);
+
+ bluesky_superblock_flush(fs);
return inum;
}
case BLUESKY_DIRECTORY:
i->dirents = g_sequence_new(bluesky_dirent_destroy);
i->dirhash = g_hash_table_new(g_str_hash, g_str_equal);
+ i->dirhash_folded = g_hash_table_new(g_str_hash, g_str_equal);
break;
case BLUESKY_BLOCK:
case BLUESKY_CHARACTER:
/* Retrieve an inode from the filesystem. Eventually this will be a cache and
* so we might need to go fetch the inode from elsewhere; for now all
- * filesystem state is stored here. */
+ * filesystem state is stored here. inode is returned locked with a reference
+ * held. */
BlueSkyInode *bluesky_get_inode(BlueSkyFS *fs, uint64_t inum)
{
BlueSkyInode *inode = NULL;
+ if (inum == 0) {
+ return NULL;
+ }
+
g_mutex_lock(fs->lock);
inode = (BlueSkyInode *)g_hash_table_lookup(fs->inodes, &inum);
+
+ if (inode == NULL) {
+ bluesky_inode_fetch(fs, inum);
+ inode = (BlueSkyInode *)g_hash_table_lookup(fs->inodes, &inum);
+ }
+
+ if (inode != NULL) {
+ bluesky_inode_ref(inode);
+ }
+
g_mutex_unlock(fs->lock);
return inode;
}
-/* Insert an inode into the filesystem inode cache. */
+/* Insert an inode into the filesystem inode cache. fs should be locked. */
void bluesky_insert_inode(BlueSkyFS *fs, BlueSkyInode *inode)
{
- g_mutex_lock(fs->lock);
g_hash_table_insert(fs->inodes, &inode->inum, inode);
- g_mutex_unlock(fs->lock);
+}
+
+/* Deprecated: Synchronize an inode to stable storage. */
+void bluesky_inode_flush(BlueSkyFS *fs, BlueSkyInode *inode)
+{
+ GString *buf = g_string_new("");
+ bluesky_serialize_inode(buf, inode);
+ BlueSkyRCStr *data = bluesky_string_new_from_gstring(buf);
+
+ char key[64];
+ sprintf(key, "inode-%016"PRIx64, inode->inum);
+
+ BlueSkyStoreAsync *async = bluesky_store_async_new(fs->store);
+ async->op = STORE_OP_PUT;
+ async->key = g_strdup(key);
+ async->data = data;
+ bluesky_store_async_submit(async);
+ bluesky_store_async_unref(async);
+}
+
+/* Start writeback of an inode and all associated data. */
+void bluesky_inode_start_sync(BlueSkyInode *inode, BlueSkyStoreAsync *barrier)
+{
+ BlueSkyFS *fs = inode->fs;
+
+ GString *buf = g_string_new("");
+ bluesky_serialize_inode(buf, inode);
+ BlueSkyRCStr *data = bluesky_string_new_from_gstring(buf);
+
+ if (inode->type == BLUESKY_REGULAR)
+ bluesky_file_flush(inode, barrier);
+
+ char key[64];
+ sprintf(key, "inode-%016"PRIx64, inode->inum);
+
+ BlueSkyStoreAsync *async = bluesky_store_async_new(fs->store);
+ async->op = STORE_OP_PUT;
+ async->key = g_strdup(key);
+ async->data = data;
+ bluesky_store_async_submit(async);
+ if (barrier != NULL)
+ bluesky_store_add_barrier(barrier, async);
+ bluesky_store_async_unref(async);
+}
+
+/* Fetch an inode from stable storage. */
+void bluesky_inode_fetch(BlueSkyFS *fs, uint64_t inum)
+{
+ char key[64];
+ sprintf(key, "inode-%016"PRIx64, inum);
+ BlueSkyRCStr *data = bluesky_store_get(fs->store, key);
+ if (data == NULL)
+ return;
+
+ BlueSkyInode *inode = bluesky_deserialize_inode(fs, data->data);
+ if (inode != NULL) {
+ bluesky_insert_inode(fs, inode);
+ }
+}
+
+/* Synchronize filesystem superblock to stable storage. */
+void bluesky_superblock_flush(BlueSkyFS *fs)
+{
+ GString *buf = g_string_new("");
+ bluesky_serialize_superblock(buf, fs);
+ BlueSkyRCStr *data = bluesky_string_new_from_gstring(buf);
+
+ BlueSkyStoreAsync *async = bluesky_store_async_new(fs->store);
+ async->op = STORE_OP_PUT;
+ async->key = g_strdup("superblock");
+ async->data = data;
+ bluesky_store_async_submit(async);
+ bluesky_store_async_unref(async);
+
+ bluesky_store_sync(fs->store);
}
projects / bluesky.git / blobdiff