X-Git-Url: http://git.vrable.net/?a=blobdiff_plain;f=bluesky%2Finode.c;h=0a6166b6ebe0a15b241351d2453cae5e829133d4;hb=8ff0fd08d6e1cc97cdb7e94b7cd97dc28c29e674;hp=3430b19eeef21be93059b6cee714a3236cbde55e;hpb=7ca401a44bfecb14b7e5ecf849aec31157382231;p=bluesky.git diff --git a/bluesky/inode.c b/bluesky/inode.c index 3430b19..0a6166b 100644 --- a/bluesky/inode.c +++ b/bluesky/inode.c @@ -3,15 +3,40 @@ * Copyright (C) 2009 The Regents of the University of California * Written by Michael Vrable * - * TODO: Licensing + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. */ #include #include +#include #include #include -#include "bluesky.h" +#include "bluesky-private.h" + +static void inode_fetch_task(gpointer a, gpointer b); /* 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 @@ -28,7 +53,8 @@ int64_t bluesky_get_current_time() /* 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(); @@ -36,6 +62,21 @@ void bluesky_inode_update_ctime(BlueSkyInode *inode, gboolean update_mtime) inode->ctime = now; if (update_mtime) inode->mtime = now; + + if (inode->change_time == 0) + inode->change_time = now; + +#if 0 + if (bluesky_options.writethrough_cache) + bluesky_file_flush(inode, NULL); +#endif + + g_mutex_lock(inode->fs->lock); + bluesky_list_unlink(&inode->fs->unlogged_list, inode->unlogged_list); + inode->unlogged_list = bluesky_list_prepend(&inode->fs->unlogged_list, inode); + bluesky_list_unlink(&inode->fs->accessed_list, inode->accessed_list); + inode->accessed_list = bluesky_list_prepend(&inode->fs->accessed_list, inode); + g_mutex_unlock(inode->fs->lock); } /* Unfortunately a glib hash table is only guaranteed to be able to store @@ -68,6 +109,54 @@ BlueSkyFS *bluesky_new_fs(gchar *name) bluesky_fs_key_equal_func); fs->next_inum = BLUESKY_ROOT_INUM + 1; fs->store = bluesky_store_new("file"); + fs->flushd_lock = g_mutex_new(); + fs->flushd_cond = g_cond_new(); + fs->locations = g_hash_table_new(bluesky_cloudlog_hash, + bluesky_cloudlog_equal); + fs->inode_map = g_sequence_new(NULL); + + fs->log_state = g_new0(BlueSkyCloudLogState, 1); + fs->log_state->data = g_string_new(""); + fs->log_state->latest_cleaner_seq_seen = -1; + fs->log_state->uploads_pending_lock = g_mutex_new(); + fs->log_state->uploads_pending_cond = g_cond_new(); + + bluesky_cloudlog_threads_init(fs); + fs->inode_fetch_thread_pool = g_thread_pool_new(inode_fetch_task, NULL, + bluesky_max_threads, + FALSE, NULL); + + return fs; +} + +BlueSkyFS *bluesky_init_fs(gchar *name, BlueSkyStore *store, + const gchar *master_key) +{ + BlueSkyFS *fs = bluesky_new_fs(name); + fs->master_key = g_strdup(master_key); + fs->keys = g_new(BlueSkyCryptKeys, 1); + bluesky_crypt_derive_keys(fs->keys, master_key); + fs->store = store; + fs->log = bluesky_log_new("journal"); + fs->log->fs = fs; + + if (bluesky_checkpoint_load(fs)) { + g_print("Filesystem checkpoint loaded, starting journal replay...\n"); + bluesky_replay(fs); + g_print("Journal replay complete, filesystem ready.\n"); + } else { + /* Initialize a fresh filesystem */ + g_print("Initializing new filesystem...\n"); + BlueSkyInode *root = bluesky_new_inode(BLUESKY_ROOT_INUM, fs, + BLUESKY_DIRECTORY); + root->nlink = 1; + root->mode = 0755; + bluesky_insert_inode(fs, root); + bluesky_inode_update_ctime(root, TRUE); + bluesky_inode_do_sync(root); + } + + bluesky_cleaner_thread_launch(fs); return fs; } @@ -78,38 +167,101 @@ void bluesky_inode_ref(BlueSkyInode *inode) g_atomic_int_inc(&inode->refcount); } +/* Free most of the resources used by an inode structure, but do not free the + * inode itself. Can be used if the inode data will be reloaded from + * serialized form to clear out old information first. */ +void bluesky_inode_free_resources(BlueSkyInode *inode) +{ + switch (inode->type) { + case BLUESKY_REGULAR: + if (inode->blocks != NULL) { + for (int i = 0; i < inode->blocks->len; i++) { + BlueSkyBlock *b = &g_array_index(inode->blocks, + BlueSkyBlock, i); + if (b->type == BLUESKY_BLOCK_DIRTY) { + g_error("Deleting an inode with dirty file data!"); + } + bluesky_cloudlog_unref(b->ref); + bluesky_string_unref(b->dirty); + } + g_array_unref(inode->blocks); + inode->blocks = NULL; + } + break; + + case BLUESKY_DIRECTORY: + if (inode->dirhash != NULL) + g_hash_table_destroy(inode->dirhash); + inode->dirhash = NULL; + if (inode->dirhash_folded != NULL) + g_hash_table_destroy(inode->dirhash_folded); + inode->dirhash_folded = NULL; + if (inode->dirents != NULL) + g_sequence_free(inode->dirents); + inode->dirents = NULL; + break; + + case BLUESKY_SYMLINK: + g_free(inode->symlink_contents); + inode->symlink_contents = NULL; + break; + + default: + break; + } +} + 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", - inode->inum); + if (bluesky_verbose) { + g_log("bluesky/inode", G_LOG_LEVEL_DEBUG, + "Reference count for inode %"PRIu64" dropped to zero.", + inode->inum); + } + + /* Sanity check: Is the inode clean? */ + if (inode->change_commit < inode->change_count + || inode->accessed_list != NULL + || inode->unlogged_list != NULL + || inode->dirty_list != NULL) { + g_warning("Dropping inode which is not clean (commit %"PRIi64" < change %"PRIi64"; accessed_list = %p; dirty_list = %p)\n", inode->change_commit, inode->change_count, inode->accessed_list, inode->dirty_list); + } + + /* These shouldn't be needed, but in case the above warning fires and + * we delete the inode anyway, we ought to be sure the inode is not on + * any LRU list. */ + g_mutex_lock(inode->fs->lock); + bluesky_list_unlink(&inode->fs->accessed_list, inode->accessed_list); + bluesky_list_unlink(&inode->fs->dirty_list, inode->dirty_list); + bluesky_list_unlink(&inode->fs->unlogged_list, inode->unlogged_list); + g_mutex_unlock(inode->fs->lock); + + bluesky_inode_free_resources(inode); + + g_mutex_free(inode->lock); + g_free(inode); } } /* 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); return inum; } -BlueSkyInode *bluesky_new_inode(uint64_t inum, BlueSkyFS *fs, - BlueSkyFileType type) +/* Perform type-specification initialization of an inode. Normally performed + * in bluesky_new_inode, but can be separated if an inode is created first, + * then deserialized. */ +void bluesky_init_inode(BlueSkyInode *i, BlueSkyFileType type) { - BlueSkyInode *i = g_new0(BlueSkyInode, 1); - - i->lock = g_mutex_new(); - i->refcount = 1; i->type = type; - i->fs = fs; - i->inum = inum; switch (type) { case BLUESKY_REGULAR: @@ -118,72 +270,193 @@ BlueSkyInode *bluesky_new_inode(uint64_t inum, BlueSkyFS *fs, 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: - case BLUESKY_SYMLINK: - case BLUESKY_SOCKET: - case BLUESKY_FIFO: + default: break; } +} + +BlueSkyInode *bluesky_new_inode(uint64_t inum, BlueSkyFS *fs, + BlueSkyFileType type) +{ + BlueSkyInode *i = g_new0(BlueSkyInode, 1); + + i->lock = g_mutex_new(); + i->refcount = 1; + i->fs = fs; + i->inum = inum; + i->change_count = 1; + bluesky_init_inode(i, type); return i; } +/* Issue a prefetch hint for an inode. This signals that the inode may be + * needed soon. Does not return any useful data. */ +void bluesky_inode_prefetch(BlueSkyFS *fs, uint64_t inum) +{ + BlueSkyInode *inode = NULL; + + g_mutex_lock(fs->lock); + inode = (BlueSkyInode *)g_hash_table_lookup(fs->inodes, &inum); + + if (inode != NULL) { + /* Inode is already available, no need for any prefetching... */ + g_mutex_unlock(fs->lock); + return; + } + + InodeMapEntry *entry = bluesky_inode_map_lookup(fs->inode_map, inum, 0); + if (entry != NULL) { + bluesky_cloudlog_prefetch(entry->item); + } + + g_mutex_unlock(fs->lock); + return; +} + /* 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 with a reference held + * but not locked. */ 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); - g_mutex_unlock(fs->lock); if (inode == NULL) { bluesky_inode_fetch(fs, inum); - g_mutex_lock(fs->lock); inode = (BlueSkyInode *)g_hash_table_lookup(fs->inodes, &inum); - g_mutex_unlock(fs->lock); } + if (inode != NULL) { + bluesky_inode_ref(inode); + + /* FIXME: We assume we can atomically update the in-memory access time + * without a lock. */ + inode->access_time = bluesky_get_current_time(); + } + + 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); } -/* Synchronize an inode to stable storage. */ -void bluesky_inode_flush(BlueSkyFS *fs, BlueSkyInode *inode) +/* Start writeback of an inode and all associated data. */ +void bluesky_inode_start_sync(BlueSkyInode *inode) +{ + GList *log_items = NULL; + + if (inode->type == BLUESKY_REGULAR) + bluesky_file_flush(inode, &log_items); + + BlueSkyCloudLog *cloudlog = bluesky_serialize_inode(inode); + + bluesky_cloudlog_unref(inode->committed_item); + inode->committed_item = cloudlog; + + bluesky_cloudlog_sync(cloudlog); + bluesky_cloudlog_ref(cloudlog); + log_items = g_list_prepend(log_items, cloudlog); + + /* Wait for all log items to be committed to disk. */ + bluesky_log_finish_all(log_items); + + /* Mark the inode as clean */ + inode->change_commit = inode->change_count; + inode->change_time = 0; + g_mutex_lock(inode->fs->lock); + bluesky_list_unlink(&inode->fs->unlogged_list, inode->unlogged_list); + inode->unlogged_list = NULL; + + /* Since a new version of the inode has been written to the log, also + * schedule a future flush of the new data to cloud storage. */ + bluesky_list_unlink(&inode->fs->dirty_list, inode->dirty_list); + inode->dirty_list = bluesky_list_prepend(&inode->fs->dirty_list, inode); + inode->change_cloud = inode->change_count; + + g_mutex_unlock(inode->fs->lock); +} + +/* Write back an inode and all associated data and wait for completion. Inode + * should already be locked. */ +void bluesky_inode_do_sync(BlueSkyInode *inode) { - GString *buf = g_string_new(""); - bluesky_serialize_inode(buf, inode); + if (bluesky_verbose) { + g_log("bluesky/inode", G_LOG_LEVEL_DEBUG, + "Synchronous writeback for inode %"PRIu64"...", inode->inum); + } + bluesky_inode_start_sync(inode); + if (bluesky_verbose) { + g_log("bluesky/inode", G_LOG_LEVEL_DEBUG, + "Writeback for inode %"PRIu64" complete", inode->inum); + } +} + +static void inode_fetch_task(gpointer a, gpointer b) +{ + BlueSkyInode *inode = (BlueSkyInode *)a; + + bluesky_profile_set((BlueSkyProfile *)inode->private_data); - gsize len = buf->len; - BlueSkyRCStr *data = bluesky_string_new(g_string_free(buf, FALSE), len); + BlueSkyCloudLog *item = inode->committed_item; + inode->committed_item = NULL; + g_print("Completing fetch of inode %"PRIu64"...\n", inode->inum); - char key[64]; - sprintf(key, "inode-%016llx", inode->inum); + g_mutex_lock(item->lock); + bluesky_cloudlog_fetch(item); + if (!bluesky_deserialize_inode(inode, item)) + g_print("Error deserializing inode %"PRIu64"\n", inode->inum); + g_mutex_unlock(item->lock); - bluesky_store_put(fs->store, key, data); + inode->access_time = bluesky_get_current_time(); + g_mutex_lock(inode->fs->lock); + bluesky_list_unlink(&inode->fs->accessed_list, inode->accessed_list); + inode->accessed_list = bluesky_list_prepend(&inode->fs->accessed_list, inode); + g_mutex_unlock(inode->fs->lock); + + g_mutex_unlock(inode->lock); + bluesky_cloudlog_unref(item); + bluesky_inode_unref(inode); } -/* Fetch an inode from stable storage. */ +/* Fetch an inode from stable storage. The fetch can be performed + * asynchronously: the in-memory inode is allocated, but not filled with data + * immediately. It is kept locked until it has been filled in, so any users + * should try to acquire the lock on the inode before accessing any data. The + * fs lock must be held. */ void bluesky_inode_fetch(BlueSkyFS *fs, uint64_t inum) { - char key[64]; - sprintf(key, "inode-%016llx", inum); - BlueSkyRCStr *data = bluesky_store_get(fs->store, key); + InodeMapEntry *entry = bluesky_inode_map_lookup(fs->inode_map, inum, 0); + if (entry == NULL) + return; - BlueSkyInode *inode = bluesky_deserialize_inode(fs, data->data); - if (inode != NULL) { - bluesky_insert_inode(fs, inode); - g_print("Loaded inode %lld\n", (long long)inum); - } + /* Non-portable behavior: We take the inode lock here, and release it in + * the fetching thread. This works with the default Linux pthreads + * implementation but is not guaranteed. */ + + BlueSkyInode *inode = bluesky_new_inode(inum, fs, BLUESKY_PENDING); + inode->change_count = 0; + bluesky_inode_ref(inode); // Extra ref held by fetching process + g_mutex_lock(inode->lock); + + inode->committed_item = entry->item; + bluesky_cloudlog_ref(entry->item); + bluesky_insert_inode(fs, inode); + + inode->private_data = bluesky_profile_get(); + g_thread_pool_push(fs->inode_fetch_thread_pool, inode, NULL); }