*/
#include <stdint.h>
+#include <inttypes.h>
#include <glib.h>
#include <string.h>
-#include "bluesky.h"
+#include "bluesky-private.h"
/* Serialization of in-memory filesystem data structures to bytestrings which
* can be written to persistent storage. All data is stored in little-endian
* format. */
+/* Magic signature and structure of serialized superblocks. */
+
+#define SUPERBLOCK_MAGIC 0x65ca91e91b124234ULL
+
+struct serialized_superblock {
+ uint64_t signature; /* SUPERBLOCK_MAGIC */
+ uint64_t next_inum;
+} __attribute__((packed));
+
/* Magic signature for serialized inodes. */
-#define INODE_MAGIC 0xa6832100943d71e5ULL
+#define INODE_MAGIC 0xa6832100943d71e6ULL
struct serialized_inode {
uint64_t signature; /* INODE_MAGIC */
int64_t ntime;
} __attribute__((packed));
+void bluesky_serialize_superblock(GString *out, BlueSkyFS *fs)
+{
+ struct serialized_superblock buf;
+
+ buf.signature = GUINT64_TO_LE(SUPERBLOCK_MAGIC);
+ buf.next_inum = GUINT64_TO_LE(fs->next_inum);
+
+ g_string_append_len(out, (gchar *)&buf, sizeof(buf));
+}
+
+BlueSkyFS *bluesky_deserialize_superblock(const gchar *buf)
+{
+ struct serialized_superblock *raw = (struct serialized_superblock *)buf;
+
+ if (GUINT64_FROM_LE(raw->signature) != SUPERBLOCK_MAGIC)
+ return NULL;
+
+ BlueSkyFS *fs = bluesky_new_fs("deserialized");
+ fs->next_inum = GUINT64_FROM_LE(raw->next_inum);
+
+ return fs;
+}
+
void bluesky_serialize_inode(GString *out, BlueSkyInode *inode)
{
struct serialized_inode buf;
switch (inode->type) {
case BLUESKY_REGULAR:
+ {
+ uint64_t size = GUINT64_TO_LE(inode->size);
+ g_string_append_len(out, (gchar *)&size, sizeof(uint64_t));
for (int i = 0; i < inode->blocks->len; i++) {
BlueSkyBlock *b = &g_array_index(inode->blocks, BlueSkyBlock, i);
+ BlueSkyCloudID id;
+ memset(&id, 0, sizeof(id));
if (b->ref != NULL)
- g_string_append(out, b->ref);
+ id = b->ref->id;
+ g_string_append_len(out, (const char *)&id, sizeof(id));
+ }
+ break;
+ }
+
+ case BLUESKY_DIRECTORY:
+ {
+ uint32_t seq;
+ uint64_t inum;
+ GSequenceIter *i = g_sequence_get_begin_iter(inode->dirents);
+
+ while (!g_sequence_iter_is_end(i)) {
+ BlueSkyDirent *d = g_sequence_get(i);
+
+ seq = GUINT32_TO_LE(d->cookie);
+ inum = GUINT64_TO_LE(d->inum);
+ g_string_append_len(out, (gchar *)&seq, sizeof(uint32_t));
+ g_string_append_len(out, (gchar *)&inum, sizeof(uint64_t));
+ g_string_append(out, d->name);
g_string_append_c(out, '\0');
+
+ i = g_sequence_iter_next(i);
}
+
+ seq = GUINT32_TO_LE(0);
+ g_string_append_len(out, (gchar *)&seq, sizeof(uint32_t));
+
break;
+ }
+
+ case BLUESKY_SYMLINK:
+ {
+ g_string_append(out, inode->symlink_contents);
+ g_string_append_c(out, '\0');
+ break;
+ }
+
default:
g_warning("Serialization for inode type %d not implemented!\n",
inode->type);
}
}
-BlueSkyInode *bluesky_deserialize_inode(BlueSkyFS *fs, const gchar *buf)
+/* Deserialize an inode into an in-memory representation. Returns a boolean
+ * indicating whether the deserialization was successful. */
+gboolean bluesky_deserialize_inode(BlueSkyInode *inode, const gchar *buf)
{
+ if (bluesky_verbose) {
+ g_log("bluesky/serialize", G_LOG_LEVEL_DEBUG,
+ "Deserializing inode %lld...", (long long)inode->inum);
+ }
+
struct serialized_inode *raw = (struct serialized_inode *)buf;
if (GUINT64_FROM_LE(raw->signature) != INODE_MAGIC)
- return NULL;
+ return FALSE;
+
+ if (inode->inum != GUINT64_FROM_LE(raw->inum))
+ return FALSE;
- BlueSkyInode *inode = bluesky_new_inode(GUINT64_FROM_LE(raw->inum),
- fs, GUINT32_FROM_LE(raw->type));
+ bluesky_init_inode(inode, GUINT32_FROM_LE(raw->type));
inode->mode = GUINT32_FROM_LE(raw->mode);
inode->uid = GUINT32_FROM_LE(raw->uid);
inode->gid = GUINT32_FROM_LE(raw->gid);
inode->nlink = GUINT32_FROM_LE(raw->nlink);
inode->change_count = GUINT64_FROM_LE(raw->change_count);
+ inode->change_commit = inode->change_count;
inode->atime = GINT64_FROM_LE(raw->atime);
inode->ctime = GINT64_FROM_LE(raw->ctime);
inode->mtime = GINT64_FROM_LE(raw->mtime);
buf += sizeof(struct serialized_inode);
+ /* TODO: Bounds checking */
switch (inode->type) {
case BLUESKY_REGULAR:
+ inode->size = GINT64_FROM_LE(*(uint64_t *)buf);
+ buf += sizeof(uint64_t);
g_array_set_size(inode->blocks,
(inode->size + BLUESKY_BLOCK_SIZE - 1)
/ BLUESKY_BLOCK_SIZE);
+ // TODO
+#if 0
for (int i = 0; i < inode->blocks->len; i++) {
BlueSkyBlock *b = &g_array_index(inode->blocks, BlueSkyBlock, i);
b->type = BLUESKY_BLOCK_REF;
b->ref = g_strdup(buf);
buf += strlen(b->ref) + 1;
}
+#endif
+ break;
+
+ case BLUESKY_DIRECTORY:
+ {
+ struct serialized_dirent {
+ uint32_t seq;
+ uint64_t inum;
+ gchar name[0];
+ } __attribute__((packed));
+
+ struct serialized_dirent *d = (struct serialized_dirent *)buf;
+ while (GUINT32_FROM_LE(d->seq) != 0) {
+ BlueSkyDirent *dirent = g_new(BlueSkyDirent, 1);
+ dirent->cookie = GUINT64_FROM_LE(d->seq);
+ dirent->inum = GUINT64_FROM_LE(d->inum);
+ dirent->name = g_strdup(d->name);
+ dirent->name_folded = bluesky_lowercase(d->name);
+
+ g_sequence_insert_sorted(inode->dirents, dirent,
+ bluesky_dirent_compare, NULL);
+ g_hash_table_insert(inode->dirhash, dirent->name, dirent);
+ g_hash_table_insert(inode->dirhash_folded, dirent->name_folded,
+ dirent);
+
+ buf = strchr(d->name, '\0') + 1;
+ d = (struct serialized_dirent *)buf;
+ }
break;
+ }
+
+ case BLUESKY_SYMLINK:
+ {
+ inode->symlink_contents = g_strdup(buf);
+ break;
+ }
+
default:
g_warning("Deserialization for inode type %d not implemented!\n",
inode->type);
}
+
+ return TRUE;
}
projects / bluesky.git / blobdiff