link_directories(/home/mvrable/scratch/libs3-1.4/build/lib)
-add_library(bluesky SHARED crypto.c dir.c inode.c serialize.c store.c s3store.c)
+add_library(bluesky SHARED crypto.c dir.c file.c inode.c serialize.c store.c s3store.c)
add_executable(bluesky-test main.c)
set(CMAKE_C_FLAGS "-std=gnu99 ${CMAKE_C_FLAGS}")
--- /dev/null
+/* Blue Sky: File Systems in the Cloud
+ *
+ * Copyright (C) 2009 The Regents of the University of California
+ * Written by Michael Vrable <mvrable@cs.ucsd.edu>
+ *
+ * TODO: Licensing
+ */
+
+#include <stdint.h>
+#include <glib.h>
+#include <string.h>
+
+#include "bluesky.h"
+
+/* Core filesystem: handling of regular files and caching of file data. */
+
+/* Mark a given block dirty and make sure that data is faulted in so that it
+ * can be written to. */
+void bluesky_block_touch(BlueSkyInode *inode, uint64_t i)
+{
+ g_return_if_fail(i < inode->blocks->len);
+ BlueSkyBlock *block = &g_array_index(inode->blocks, BlueSkyBlock, i);
+
+ switch (block->type) {
+ case BLUESKY_BLOCK_ZERO:
+ block->data = bluesky_string_new(g_malloc0(BLUESKY_BLOCK_SIZE),
+ BLUESKY_BLOCK_SIZE);
+ break;
+ case BLUESKY_BLOCK_REF:
+ bluesky_block_fetch(inode->fs, block);
+ g_assert(block->type == BLUESKY_BLOCK_CACHED);
+ /* Fall through */
+ case BLUESKY_BLOCK_CACHED:
+ case BLUESKY_BLOCK_DIRTY:
+ block->data = bluesky_string_dup(block->data);
+ break;
+ }
+
+ block->type = BLUESKY_BLOCK_DIRTY;
+}
+
+/* Set the size of a file. This will truncate or extend the file as needed.
+ * Newly-allocated bytes are zeroed. */
+void bluesky_file_truncate(BlueSkyInode *inode, uint64_t size)
+{
+ g_return_if_fail(size <= BLUESKY_MAX_FILE_SIZE);
+
+ if (size == inode->size)
+ return;
+
+ uint64_t blocks = (size + BLUESKY_BLOCK_SIZE - 1) / BLUESKY_BLOCK_SIZE;
+
+ if (blocks > inode->blocks->len) {
+ /* Need to add new blocks to the end of a file. New block structures
+ * are automatically zeroed, which initializes them to be pointers to
+ * zero blocks so we don't need to do any more work. */
+ g_array_set_size(inode->blocks, blocks);
+ } else if (blocks < inode->blocks->len) {
+ /* Delete blocks from a file. Must reclaim memory. */
+ for (guint i = inode->blocks->len; i < blocks; i++) {
+ BlueSkyBlock *b = &g_array_index(inode->blocks, BlueSkyBlock, i);
+ g_free(b->ref);
+ bluesky_string_unref(b->data);
+ }
+ g_array_set_size(inode->blocks, blocks);
+ }
+
+ /* If the file size is being decreased, ensure that any trailing data in
+ * the last block is zeroed. */
+ if (size < inode->size) {
+ BlueSkyBlock *b = &g_array_index(inode->blocks, BlueSkyBlock,
+ blocks - 1);
+ if (b->type != BLUESKY_BLOCK_ZERO) {
+ bluesky_block_touch(inode, blocks - 1);
+ int end_offset = size % BLUESKY_BLOCK_SIZE;
+ if (end_offset > 0) {
+ memset(&b->data->data[end_offset], 0,
+ BLUESKY_BLOCK_SIZE - end_offset);
+ }
+ }
+ }
+
+ inode->size = size;
+ bluesky_inode_update_ctime(inode, 1);
+}
+
+void bluesky_file_write(BlueSkyInode *inode, uint64_t offset,
+ const char *data, gint len)
+{
+ g_return_if_fail(inode->type == BLUESKY_REGULAR);
+ g_return_if_fail(offset < inode->size);
+ g_return_if_fail(len <= inode->size - offset);
+
+ if (len == 0)
+ return;
+
+ while (len > 0) {
+ uint64_t block_num = offset / BLUESKY_BLOCK_SIZE;
+ gint block_offset = offset % BLUESKY_BLOCK_SIZE;
+ gint bytes = MIN(BLUESKY_BLOCK_SIZE - block_offset, len);
+
+ bluesky_block_touch(inode, block_num);
+ BlueSkyBlock *b = &g_array_index(inode->blocks, BlueSkyBlock,
+ block_num);
+ memcpy(&b->data->data[block_offset], data, bytes);
+ bluesky_block_flush(inode->fs, b);
+
+ offset += bytes;
+ data += bytes;
+ len -= bytes;
+ }
+
+ bluesky_inode_update_ctime(inode, 1);
+}
+
+void bluesky_file_read(BlueSkyInode *inode, uint64_t offset,
+ char *buf, gint len)
+{
+ g_return_if_fail(inode->type == BLUESKY_REGULAR);
+ g_return_if_fail(offset < inode->size);
+ g_return_if_fail(len <= inode->size - offset);
+
+ while (len > 0) {
+ uint64_t block_num = offset / BLUESKY_BLOCK_SIZE;
+ gint block_offset = offset % BLUESKY_BLOCK_SIZE;
+ gint bytes = MIN(BLUESKY_BLOCK_SIZE - block_offset, len);
+
+ BlueSkyBlock *b = &g_array_index(inode->blocks, BlueSkyBlock,
+ block_num);
+ switch (b->type) {
+ case BLUESKY_BLOCK_ZERO:
+ memset(buf, 0, bytes);
+ break;
+ case BLUESKY_BLOCK_REF:
+ bluesky_block_fetch(inode->fs, b);
+ /* Fall through */
+ case BLUESKY_BLOCK_CACHED:
+ case BLUESKY_BLOCK_DIRTY:
+ memcpy(buf, &b->data->data[block_offset], bytes);
+ break;
+ }
+
+ offset += bytes;
+ buf += bytes;
+ len -= bytes;
+ }
+}
+
+/* Read the given block from cloud-backed storage if the data is not already
+ * cached. */
+void bluesky_block_fetch(BlueSkyFS *fs, BlueSkyBlock *block)
+{
+ if (block->type != BLUESKY_BLOCK_REF)
+ return;
+
+ g_print("Fetching block from %s\n", block->ref);
+ BlueSkyRCStr *string = s3store_get(fs->store, block->ref);
+
+ bluesky_string_unref(block->data);
+ block->data = bluesky_crypt_decrypt(string, fs->encryption_key);
+ block->type = BLUESKY_BLOCK_CACHED;
+ bluesky_string_unref(string);
+}
+
+/* Write the given block to cloud-backed storage and mark it clean. */
+void bluesky_block_flush(BlueSkyFS *fs, BlueSkyBlock *block)
+{
+ if (block->type != BLUESKY_BLOCK_DIRTY)
+ return;
+
+ BlueSkyRCStr *data = block->data;
+ data = bluesky_crypt_encrypt(data, fs->encryption_key);
+
+ GChecksum *csum = g_checksum_new(G_CHECKSUM_SHA256);
+ g_checksum_update(csum, data->data, data->len);
+ gchar *name = g_strdup(g_checksum_get_string(csum));
+
+ g_print("Flushing block as %s\n", name);
+ s3store_put(fs->store, name, data);
+ g_free(block->ref);
+ block->ref = name;
+
+ /* block->type = BLUESKY_BLOCK_CACHED; */
+ bluesky_string_unref(block->data);
+ block->data = NULL;
+ block->type = BLUESKY_BLOCK_REF;
+
+ g_checksum_free(csum);
+ bluesky_string_unref(data);
+}
g_hash_table_insert(fs->inodes, &inode->inum, inode);
g_mutex_unlock(fs->lock);
}
-
-/* Mark a given block dirty and make sure that data is faulted in so that it
- * can be written to. */
-void bluesky_block_touch(BlueSkyInode *inode, uint64_t i)
-{
- g_return_if_fail(i < inode->blocks->len);
- BlueSkyBlock *block = &g_array_index(inode->blocks, BlueSkyBlock, i);
-
- switch (block->type) {
- case BLUESKY_BLOCK_ZERO:
- block->data = bluesky_string_new(g_malloc0(BLUESKY_BLOCK_SIZE),
- BLUESKY_BLOCK_SIZE);
- break;
- case BLUESKY_BLOCK_REF:
- bluesky_block_fetch(inode->fs, block);
- g_assert(block->type == BLUESKY_BLOCK_CACHED);
- /* Fall through */
- case BLUESKY_BLOCK_CACHED:
- case BLUESKY_BLOCK_DIRTY:
- block->data = bluesky_string_dup(block->data);
- break;
- }
-
- block->type = BLUESKY_BLOCK_DIRTY;
-}
-
-/* Set the size of a file. This will truncate or extend the file as needed.
- * Newly-allocated bytes are zeroed. */
-void bluesky_file_truncate(BlueSkyInode *inode, uint64_t size)
-{
- g_return_if_fail(size <= BLUESKY_MAX_FILE_SIZE);
-
- if (size == inode->size)
- return;
-
- uint64_t blocks = (size + BLUESKY_BLOCK_SIZE - 1) / BLUESKY_BLOCK_SIZE;
-
- if (blocks > inode->blocks->len) {
- /* Need to add new blocks to the end of a file. New block structures
- * are automatically zeroed, which initializes them to be pointers to
- * zero blocks so we don't need to do any more work. */
- g_array_set_size(inode->blocks, blocks);
- } else if (blocks < inode->blocks->len) {
- /* Delete blocks from a file. Must reclaim memory. */
- for (guint i = inode->blocks->len; i < blocks; i++) {
- BlueSkyBlock *b = &g_array_index(inode->blocks, BlueSkyBlock, i);
- g_free(b->ref);
- bluesky_string_unref(b->data);
- }
- g_array_set_size(inode->blocks, blocks);
- }
-
- /* If the file size is being decreased, ensure that any trailing data in
- * the last block is zeroed. */
- if (size < inode->size) {
- BlueSkyBlock *b = &g_array_index(inode->blocks, BlueSkyBlock,
- blocks - 1);
- if (b->type != BLUESKY_BLOCK_ZERO) {
- bluesky_block_touch(inode, blocks - 1);
- int end_offset = size % BLUESKY_BLOCK_SIZE;
- if (end_offset > 0) {
- memset(&b->data->data[end_offset], 0,
- BLUESKY_BLOCK_SIZE - end_offset);
- }
- }
- }
-
- inode->size = size;
- bluesky_inode_update_ctime(inode, 1);
-}
-
-void bluesky_file_write(BlueSkyInode *inode, uint64_t offset,
- const char *data, gint len)
-{
- g_return_if_fail(inode->type == BLUESKY_REGULAR);
- g_return_if_fail(offset < inode->size);
- g_return_if_fail(len <= inode->size - offset);
-
- if (len == 0)
- return;
-
- while (len > 0) {
- uint64_t block_num = offset / BLUESKY_BLOCK_SIZE;
- gint block_offset = offset % BLUESKY_BLOCK_SIZE;
- gint bytes = MIN(BLUESKY_BLOCK_SIZE - block_offset, len);
-
- bluesky_block_touch(inode, block_num);
- BlueSkyBlock *b = &g_array_index(inode->blocks, BlueSkyBlock,
- block_num);
- memcpy(&b->data->data[block_offset], data, bytes);
- bluesky_block_flush(inode->fs, b);
-
- offset += bytes;
- data += bytes;
- len -= bytes;
- }
-
- bluesky_inode_update_ctime(inode, 1);
-}
-
-void bluesky_file_read(BlueSkyInode *inode, uint64_t offset,
- char *buf, gint len)
-{
- g_return_if_fail(inode->type == BLUESKY_REGULAR);
- g_return_if_fail(offset < inode->size);
- g_return_if_fail(len <= inode->size - offset);
-
- while (len > 0) {
- uint64_t block_num = offset / BLUESKY_BLOCK_SIZE;
- gint block_offset = offset % BLUESKY_BLOCK_SIZE;
- gint bytes = MIN(BLUESKY_BLOCK_SIZE - block_offset, len);
-
- BlueSkyBlock *b = &g_array_index(inode->blocks, BlueSkyBlock,
- block_num);
- switch (b->type) {
- case BLUESKY_BLOCK_ZERO:
- memset(buf, 0, bytes);
- break;
- case BLUESKY_BLOCK_REF:
- bluesky_block_fetch(inode->fs, b);
- /* Fall through */
- case BLUESKY_BLOCK_CACHED:
- case BLUESKY_BLOCK_DIRTY:
- memcpy(buf, &b->data->data[block_offset], bytes);
- break;
- }
-
- offset += bytes;
- buf += bytes;
- len -= bytes;
- }
-}
-
-/* Read the given block from cloud-backed storage if the data is not already
- * cached. */
-void bluesky_block_fetch(BlueSkyFS *fs, BlueSkyBlock *block)
-{
- if (block->type != BLUESKY_BLOCK_REF)
- return;
-
- g_print("Fetching block from %s\n", block->ref);
- BlueSkyRCStr *string = s3store_get(fs->store, block->ref);
-
- bluesky_string_unref(block->data);
- block->data = bluesky_crypt_decrypt(string, fs->encryption_key);
- block->type = BLUESKY_BLOCK_CACHED;
- bluesky_string_unref(string);
-}
-
-/* Write the given block to cloud-backed storage and mark it clean. */
-void bluesky_block_flush(BlueSkyFS *fs, BlueSkyBlock *block)
-{
- if (block->type != BLUESKY_BLOCK_DIRTY)
- return;
-
- BlueSkyRCStr *data = block->data;
- data = bluesky_crypt_encrypt(data, fs->encryption_key);
-
- GChecksum *csum = g_checksum_new(G_CHECKSUM_SHA256);
- g_checksum_update(csum, data->data, data->len);
- gchar *name = g_strdup(g_checksum_get_string(csum));
-
- g_print("Flushing block as %s\n", name);
- s3store_put(fs->store, name, data);
- g_free(block->ref);
- block->ref = name;
-
- /* block->type = BLUESKY_BLOCK_CACHED; */
- bluesky_string_unref(block->data);
- block->data = NULL;
- block->type = BLUESKY_BLOCK_REF;
-
- g_checksum_free(csum);
- bluesky_string_unref(data);
-}
projects / bluesky.git / commitdiff