diff options
Diffstat (limited to 'xlators/performance/io-cache/src/io-cache.c')
| -rw-r--r-- | xlators/performance/io-cache/src/io-cache.c | 1478 |
1 files changed, 1478 insertions, 0 deletions
diff --git a/xlators/performance/io-cache/src/io-cache.c b/xlators/performance/io-cache/src/io-cache.c new file mode 100644 index 00000000000..f367cdb88de --- /dev/null +++ b/xlators/performance/io-cache/src/io-cache.c @@ -0,0 +1,1478 @@ +/* + Copyright (c) 2007, 2008, 2009 Z RESEARCH, Inc. <http://www.zresearch.com> + This file is part of GlusterFS. + + GlusterFS is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published + by the Free Software Foundation; either version 3 of the License, + or (at your option) any later version. + + GlusterFS is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see + <http://www.gnu.org/licenses/>. +*/ + +#ifndef _CONFIG_H +#define _CONFIG_H +#include "config.h" +#endif + +#include "glusterfs.h" +#include "logging.h" +#include "dict.h" +#include "xlator.h" +#include "io-cache.h" +#include <assert.h> +#include <sys/time.h> + +static uint32_t +ioc_get_priority (ioc_table_t *table, + const char *path); + +static uint32_t +ioc_get_priority (ioc_table_t *table, + const char *path); + +static inline ioc_inode_t * +ioc_inode_reupdate (ioc_inode_t *ioc_inode) +{ + ioc_table_t *table = ioc_inode->table; + + list_add_tail (&ioc_inode->inode_lru, + &table->inode_lru[ioc_inode->weight]); + + return ioc_inode; +} + +static inline ioc_inode_t * +ioc_get_inode (dict_t *dict, + char *name) +{ + ioc_inode_t *ioc_inode = NULL; + data_t *ioc_inode_data = dict_get (dict, name); + ioc_table_t *table = NULL; + + if (ioc_inode_data) { + ioc_inode = data_to_ptr (ioc_inode_data); + table = ioc_inode->table; + + ioc_table_lock (table); + { + if (list_empty (&ioc_inode->inode_lru)) { + ioc_inode = ioc_inode_reupdate (ioc_inode); + } + } + ioc_table_unlock (table); + } + + return ioc_inode; +} + +int32_t +ioc_inode_need_revalidate (ioc_inode_t *ioc_inode) +{ + int8_t need_revalidate = 0; + struct timeval tv = {0,}; + int32_t ret = -1; + ioc_table_t *table = ioc_inode->table; + + ret = gettimeofday (&tv, NULL); + + if (time_elapsed (&tv, &ioc_inode->tv) >= table->cache_timeout) + need_revalidate = 1; + + return need_revalidate; +} + +/* + * __ioc_inode_flush - flush all the cached pages of the given inode + * + * @ioc_inode: + * + * assumes lock is held + */ +int32_t +__ioc_inode_flush (ioc_inode_t *ioc_inode) +{ + ioc_page_t *curr = NULL, *next = NULL; + int32_t destroy_size = 0; + int32_t ret = 0; + + list_for_each_entry_safe (curr, next, &ioc_inode->pages, pages) { + ret = ioc_page_destroy (curr); + + if (ret != -1) + destroy_size += ret; + } + + return destroy_size; +} + +void +ioc_inode_flush (ioc_inode_t *ioc_inode) +{ + int32_t destroy_size = 0; + + ioc_inode_lock (ioc_inode); + { + destroy_size = __ioc_inode_flush (ioc_inode); + } + ioc_inode_unlock (ioc_inode); + + if (destroy_size) { + ioc_table_lock (ioc_inode->table); + { + ioc_inode->table->cache_used -= destroy_size; + } + ioc_table_unlock (ioc_inode->table); + } + + return; +} + +/* + * ioc_utimens_cbk - + * + * @frame: + * @cookie: + * @this: + * @op_ret: + * @op_errno: + * @stbuf: + * + */ +int32_t +ioc_utimens_cbk (call_frame_t *frame, + void *cookie, + xlator_t *this, + int32_t op_ret, + int32_t op_errno, + struct stat *stbuf) +{ + STACK_UNWIND (frame, op_ret, op_errno, stbuf); + return 0; +} + +/* + * ioc_utimens - + * + * @frame: + * @this: + * @loc: + * @tv: + * + */ +int32_t +ioc_utimens (call_frame_t *frame, + xlator_t *this, + loc_t *loc, + struct timespec *tv) +{ + uint64_t ioc_inode = 0; + inode_ctx_get (loc->inode, this, &ioc_inode); + + if (ioc_inode) + ioc_inode_flush ((ioc_inode_t *)(long)ioc_inode); + + STACK_WIND (frame, ioc_utimens_cbk, + FIRST_CHILD (this), + FIRST_CHILD (this)->fops->utimens, + loc, tv); + return 0; +} + +int32_t +ioc_lookup_cbk (call_frame_t *frame, + void *cookie, + xlator_t *this, + int32_t op_ret, + int32_t op_errno, + inode_t *inode, + struct stat *stbuf, + dict_t *dict) +{ + ioc_inode_t *ioc_inode = NULL; + ioc_local_t *local = frame->local; + ioc_table_t *table = this->private; + ioc_page_t *page = NULL; + data_t *page_data = NULL; + data_t *content_data = NULL; + char *src = NULL; + char *dst = NULL; + char need_unref = 0; + uint8_t cache_still_valid = 0; + uint32_t weight = 0; + uint64_t tmp_ioc_inode = 0; + char *buf = NULL; + char *tmp = NULL; + int i; + + if (op_ret != 0) + goto out; + + inode_ctx_get (inode, this, &tmp_ioc_inode); + ioc_inode = (ioc_inode_t *)(long)tmp_ioc_inode; + if (ioc_inode) { + cache_still_valid = ioc_cache_still_valid (ioc_inode, + stbuf); + + if (!cache_still_valid) { + ioc_inode_flush (ioc_inode); + } + /* update the time-stamp of revalidation */ + ioc_inode_lock (ioc_inode); + { + gettimeofday (&ioc_inode->tv, NULL); + } + ioc_inode_unlock (ioc_inode); + + ioc_table_lock (ioc_inode->table); + { + list_move_tail (&ioc_inode->inode_lru, + &table->inode_lru[ioc_inode->weight]); + } + ioc_table_unlock (ioc_inode->table); + } + + if (local && stbuf->st_size && + local->need_xattr >= stbuf->st_size) { + if (!ioc_inode) { + weight = ioc_get_priority (table, + local->file_loc.path); + ioc_inode = ioc_inode_update (table, + inode, weight); + inode_ctx_put (inode, this, + (uint64_t)(long)ioc_inode); + } + + ioc_inode_lock (ioc_inode); + { + content_data = dict_get (dict, "glusterfs.content"); + page = ioc_page_get (ioc_inode, 0); + + if (content_data) { + if (page) { + dict_unref (page->ref); + free (page->vector); + page->vector = NULL; + + ioc_table_lock (table); + { + table->cache_used -= + page->size; + } + ioc_table_unlock (table); + } else { + page = ioc_page_create (ioc_inode, 0); + } + + dst = CALLOC (1, stbuf->st_size); + page->ref = dict_ref (get_new_dict ()); + page_data = data_from_dynptr (dst, + stbuf->st_size); + dict_set (page->ref, NULL, page_data); + + src = data_to_ptr (content_data); + memcpy (dst, src, stbuf->st_size); + + page->vector = CALLOC (1, + sizeof (*page->vector)); + page->vector->iov_base = dst; + page->vector->iov_len = stbuf->st_size; + page->count = 1; + + page->waitq = NULL; + page->size = stbuf->st_size; + page->ready = 1; + + ioc_table_lock (table); + { + table->cache_used += page->size; + } + ioc_table_unlock (table); + + } else { + if (!(page && page->ready)) { + gf_log (this->name, GF_LOG_DEBUG, + "page not present"); + + ioc_inode_unlock (ioc_inode); + STACK_WIND (frame, + ioc_lookup_cbk, + FIRST_CHILD (this), + FIRST_CHILD (this)->fops->lookup, + &local->file_loc, + local->xattr_req); + return 0; + } + buf = CALLOC (1, stbuf->st_size); + tmp = buf; + + for (i = 0; i < page->count; i++) { + memcpy (tmp, page->vector[i].iov_base, + page->vector[i].iov_len); + tmp += page->vector[i].iov_len; + } + + gf_log (this->name, GF_LOG_DEBUG, + "serving file %s from cache", + local->file_loc.path); + + if (!dict) { + need_unref = 1; + dict = dict_ref ( + get_new_dict ()); + } + dict_set (dict, "glusterfs.content", + data_from_dynptr (buf, + stbuf->st_size)); + } + + ioc_inode->mtime = stbuf->st_mtime; + gettimeofday (&ioc_inode->tv, NULL); + } + ioc_inode_unlock (ioc_inode); + + if (content_data && + ioc_need_prune (ioc_inode->table)) { + ioc_prune (ioc_inode->table); + } + } + + out: + STACK_UNWIND (frame, op_ret, op_errno, inode, stbuf, dict); + + if (need_unref) { + dict_unref (dict); + } + + return 0; +} + +int32_t +ioc_lookup (call_frame_t *frame, + xlator_t *this, + loc_t *loc, + dict_t *xattr_req) +{ + uint64_t content_limit = 0; + + if (GF_FILE_CONTENT_REQUESTED(xattr_req, &content_limit)) { + uint64_t tmp_ioc_inode = 0; + ioc_inode_t *ioc_inode = NULL; + ioc_page_t *page = NULL; + ioc_local_t *local = CALLOC (1, sizeof (*local)); + + local->need_xattr = content_limit; + local->file_loc.path = loc->path; + local->file_loc.inode = loc->inode; + frame->local = local; + + inode_ctx_get (loc->inode, this, &tmp_ioc_inode); + ioc_inode = (ioc_inode_t *)(long)tmp_ioc_inode; + + if (ioc_inode) { + ioc_inode_lock (ioc_inode); + { + page = ioc_page_get (ioc_inode, 0); + if ((content_limit <= + ioc_inode->table->page_size) && + page && page->ready) { + local->need_xattr = -1; + } + } + ioc_inode_unlock (ioc_inode); + } + } + + STACK_WIND (frame, + ioc_lookup_cbk, + FIRST_CHILD (this), + FIRST_CHILD (this)->fops->lookup, + loc, + xattr_req); + return 0; +} + +/* + * ioc_forget - + * + * @frame: + * @this: + * @inode: + * + */ +int32_t +ioc_forget (xlator_t *this, + inode_t *inode) +{ + uint64_t ioc_inode = 0; + + inode_ctx_get (inode, this, &ioc_inode); + + if (ioc_inode) + ioc_inode_destroy ((ioc_inode_t *)(long)ioc_inode); + + return 0; +} + + +/* + * ioc_cache_validate_cbk - + * + * @frame: + * @cookie: + * @this: + * @op_ret: + * @op_errno: + * @buf + * + */ +int32_t +ioc_cache_validate_cbk (call_frame_t *frame, + void *cookie, + xlator_t *this, + int32_t op_ret, + int32_t op_errno, + struct stat *stbuf) +{ + ioc_local_t *local = frame->local; + ioc_inode_t *ioc_inode = NULL; + size_t destroy_size = 0; + struct stat *local_stbuf = stbuf; + + ioc_inode = local->inode; + + if ((op_ret == -1) || + ((op_ret >= 0) && !ioc_cache_still_valid(ioc_inode, stbuf))) { + gf_log (ioc_inode->table->xl->name, GF_LOG_DEBUG, + "cache for inode(%p) is invalid. flushing all pages", + ioc_inode); + /* NOTE: only pages with no waiting frames are flushed by + * ioc_inode_flush. page_fault will be generated for all + * the pages which have waiting frames by ioc_inode_wakeup() + */ + ioc_inode_lock (ioc_inode); + { + destroy_size = __ioc_inode_flush (ioc_inode); + if (op_ret >= 0) + ioc_inode->mtime = stbuf->st_mtime; + } + ioc_inode_unlock (ioc_inode); + local_stbuf = NULL; + } + + if (destroy_size) { + ioc_table_lock (ioc_inode->table); + { + ioc_inode->table->cache_used -= destroy_size; + } + ioc_table_unlock (ioc_inode->table); + } + + if (op_ret < 0) + local_stbuf = NULL; + + ioc_inode_lock (ioc_inode); + { + gettimeofday (&ioc_inode->tv, NULL); + } + ioc_inode_unlock (ioc_inode); + + ioc_inode_wakeup (frame, ioc_inode, local_stbuf); + + /* any page-fault initiated by ioc_inode_wakeup() will have its own + * fd_ref on fd, safe to unref validate frame's private copy + */ + fd_unref (local->fd); + + STACK_DESTROY (frame->root); + + return 0; +} + +static int32_t +ioc_wait_on_inode (ioc_inode_t *ioc_inode, + ioc_page_t *page) +{ + ioc_waitq_t *waiter = NULL, *trav = NULL; + uint32_t page_found = 0; + + trav = ioc_inode->waitq; + + while (trav) { + if (trav->data == page) { + page_found = 1; + break; + } + trav = trav->next; + } + + if (!page_found) { + waiter = CALLOC (1, sizeof (ioc_waitq_t)); + ERR_ABORT (waiter); + waiter->data = page; + waiter->next = ioc_inode->waitq; + ioc_inode->waitq = waiter; + } + + return 0; +} + +/* + * ioc_cache_validate - + * + * @frame: + * @ioc_inode: + * @fd: + * + */ +static int32_t +ioc_cache_validate (call_frame_t *frame, + ioc_inode_t *ioc_inode, + fd_t *fd, + ioc_page_t *page) +{ + call_frame_t *validate_frame = NULL; + ioc_local_t *validate_local = NULL; + + validate_local = CALLOC (1, sizeof (ioc_local_t)); + ERR_ABORT (validate_local); + validate_frame = copy_frame (frame); + validate_local->fd = fd_ref (fd); + validate_local->inode = ioc_inode; + validate_frame->local = validate_local; + + STACK_WIND (validate_frame, + ioc_cache_validate_cbk, + FIRST_CHILD (frame->this), + FIRST_CHILD (frame->this)->fops->fstat, + fd); + + return 0; +} + +static inline uint32_t +is_match (const char *path, + const char *pattern) +{ + char *pathname = strdup (path); + int32_t ret = 0; + + ret = fnmatch (pattern, path, FNM_NOESCAPE); + + free (pathname); + + return (ret == 0); +} + +static uint32_t +ioc_get_priority (ioc_table_t *table, + const char *path) +{ + uint32_t priority = 0; + struct ioc_priority *curr = NULL; + + list_for_each_entry (curr, &table->priority_list, list) { + if (is_match (path, curr->pattern)) + priority = curr->priority; + } + + return priority; +} + +/* + * ioc_open_cbk - open callback for io cache + * + * @frame: call frame + * @cookie: + * @this: + * @op_ret: + * @op_errno: + * @fd: + * + */ +int32_t +ioc_open_cbk (call_frame_t *frame, + void *cookie, + xlator_t *this, + int32_t op_ret, + int32_t op_errno, + fd_t *fd) +{ + uint64_t tmp_ioc_inode = 0; + ioc_local_t *local = frame->local; + ioc_table_t *table = this->private; + ioc_inode_t *ioc_inode = NULL; + inode_t *inode = local->file_loc.inode; + uint32_t weight = 0; + const char *path = local->file_loc.path; + + if (op_ret != -1) { + /* look for ioc_inode corresponding to this fd */ + LOCK (&fd->inode->lock); + //{ + + inode_ctx_get (fd->inode, this, &tmp_ioc_inode); + ioc_inode = (ioc_inode_t *)(long)tmp_ioc_inode; + + if (!ioc_inode) { + /* this is the first time someone is opening this + file, assign weight + */ + weight = ioc_get_priority (table, path); + + ioc_inode = ioc_inode_update (table, inode, weight); + inode_ctx_put (fd->inode, this, + (uint64_t)(long)ioc_inode); + } else { + ioc_table_lock (ioc_inode->table); + //{ + list_move_tail (&ioc_inode->inode_lru, + &table->inode_lru[ioc_inode->weight]); + //} + ioc_table_unlock (ioc_inode->table); + } + + //} + UNLOCK (&fd->inode->lock); + + /* If mandatory locking has been enabled on this file, + we disable caching on it */ + if (((inode->st_mode & S_ISGID) && + !(inode->st_mode & S_IXGRP))) { + fd_ctx_set (fd, this, 1); + } + + /* If O_DIRECT open, we disable caching on it */ + if ((local->flags & O_DIRECT)){ + /* O_DIRECT is only for one fd, not the inode + * as a whole + */ + fd_ctx_set (fd, this, 1); + } + } + + FREE (local); + frame->local = NULL; + + STACK_UNWIND (frame, op_ret, op_errno, fd); + + return 0; +} + +/* + * ioc_create_cbk - create callback for io cache + * + * @frame: call frame + * @cookie: + * @this: + * @op_ret: + * @op_errno: + * @fd: + * @inode: + * @buf: + * + */ +int32_t +ioc_create_cbk (call_frame_t *frame, + void *cookie, + xlator_t *this, + int32_t op_ret, + int32_t op_errno, + fd_t *fd, + inode_t *inode, + struct stat *buf) +{ + ioc_local_t *local = frame->local; + ioc_table_t *table = this->private; + ioc_inode_t *ioc_inode = NULL; + uint32_t weight = 0; + const char *path = local->file_loc.path; + + if (op_ret != -1) { + { + /* assign weight */ + weight = ioc_get_priority (table, path); + + ioc_inode = ioc_inode_update (table, inode, weight); + LOCK (&fd->inode->lock); + { + inode_ctx_put (fd->inode, this, + (uint64_t)(long)ioc_inode); + } + UNLOCK (&fd->inode->lock); + } + /* If mandatory locking has been enabled on this file, + we disable caching on it */ + if ((inode->st_mode & S_ISGID) && + !(inode->st_mode & S_IXGRP)) { + fd_ctx_set (fd, this, 1); + } + + /* If O_DIRECT open, we disable caching on it */ + if (local->flags & O_DIRECT){ + /* O_DIRECT is only for one fd, not the inode + * as a whole + */ + fd_ctx_set (fd, this, 1); + } + + } + + frame->local = NULL; + FREE (local); + + STACK_UNWIND (frame, op_ret, op_errno, fd, inode, buf); + + return 0; +} + +/* + * ioc_open - open fop for io cache + * @frame: + * @this: + * @loc: + * @flags: + * + */ +int32_t +ioc_open (call_frame_t *frame, + xlator_t *this, + loc_t *loc, + int32_t flags, + fd_t *fd) +{ + + ioc_local_t *local = CALLOC (1, sizeof (ioc_local_t)); + ERR_ABORT (local); + + local->flags = flags; + local->file_loc.path = loc->path; + local->file_loc.inode = loc->inode; + + frame->local = local; + + STACK_WIND (frame, + ioc_open_cbk, + FIRST_CHILD(this), + FIRST_CHILD(this)->fops->open, + loc, + flags, + fd); + + return 0; +} + +/* + * ioc_create - create fop for io cache + * + * @frame: + * @this: + * @pathname: + * @flags: + * @mode: + * + */ +int32_t +ioc_create (call_frame_t *frame, + xlator_t *this, + loc_t *loc, + int32_t flags, + mode_t mode, + fd_t *fd) +{ + ioc_local_t *local = CALLOC (1, sizeof (ioc_local_t)); + ERR_ABORT (local); + + local->flags = flags; + local->file_loc.path = loc->path; + frame->local = local; + + STACK_WIND (frame, ioc_create_cbk, + FIRST_CHILD(this), + FIRST_CHILD(this)->fops->create, + loc, flags, mode, fd); + return 0; +} + + + + +/* + * ioc_release - release fop for io cache + * + * @frame: + * @this: + * @fd: + * + */ +int32_t +ioc_release (xlator_t *this, + fd_t *fd) +{ + return 0; +} + +/* + * ioc_readv_disabled_cbk + * @frame: + * @cookie: + * @this: + * @op_ret: + * @op_errno: + * @vector: + * @count: + * + */ +int32_t +ioc_readv_disabled_cbk (call_frame_t *frame, + void *cookie, + xlator_t *this, + int32_t op_ret, + int32_t op_errno, + struct iovec *vector, + int32_t count, + struct stat *stbuf) +{ + STACK_UNWIND (frame, op_ret, op_errno, vector, count, stbuf); + return 0; +} + + +int32_t +ioc_need_prune (ioc_table_t *table) +{ + int64_t cache_difference = 0; + + ioc_table_lock (table); + { + cache_difference = table->cache_used - table->cache_size; + } + ioc_table_unlock (table); + + if (cache_difference > 0) + return 1; + else + return 0; +} + +/* + * dispatch_requests - + * + * @frame: + * @inode: + * + * + */ +static void +dispatch_requests (call_frame_t *frame, + ioc_inode_t *ioc_inode, + fd_t *fd, + off_t offset, + size_t size) +{ + ioc_local_t *local = frame->local; + ioc_table_t *table = ioc_inode->table; + ioc_page_t *trav = NULL; + ioc_waitq_t *waitq = NULL; + off_t rounded_offset = 0; + off_t rounded_end = 0; + off_t trav_offset = 0; + int32_t fault = 0; + int8_t need_validate = 0; + int8_t might_need_validate = 0; /* if a page exists, do we need + to validate it? */ + + rounded_offset = floor (offset, table->page_size); + rounded_end = roof (offset + size, table->page_size); + trav_offset = rounded_offset; + + /* once a frame does read, it should be waiting on something */ + local->wait_count++; + + /* Requested region can fall in three different pages, + * 1. Ready - region is already in cache, we just have to serve it. + * 2. In-transit - page fault has been generated on this page, we need + * to wait till the page is ready + * 3. Fault - page is not in cache, we have to generate a page fault + */ + + might_need_validate = ioc_inode_need_revalidate (ioc_inode); + + while (trav_offset < rounded_end) { + size_t trav_size = 0; + off_t local_offset = 0; + + ioc_inode_lock (ioc_inode); + //{ + + /* look for requested region in the cache */ + trav = ioc_page_get (ioc_inode, trav_offset); + + local_offset = max (trav_offset, offset); + trav_size = min (((offset+size) - local_offset), + table->page_size); + + if (!trav) { + /* page not in cache, we need to generate page fault */ + trav = ioc_page_create (ioc_inode, trav_offset); + fault = 1; + if (!trav) { + gf_log (frame->this->name, GF_LOG_CRITICAL, + "ioc_page_create returned NULL"); + } + } + + ioc_wait_on_page (trav, frame, local_offset, trav_size); + + if (trav->ready) { + /* page found in cache */ + if (!might_need_validate) { + /* fresh enough */ + gf_log (frame->this->name, GF_LOG_DEBUG, + "cache hit for trav_offset=%"PRId64"" + "/local_offset=%"PRId64"", + trav_offset, local_offset); + waitq = ioc_page_wakeup (trav); + } else { + /* if waitq already exists, fstat revalidate is + already on the way */ + if (!ioc_inode->waitq) { + need_validate = 1; + } + ioc_wait_on_inode (ioc_inode, trav); + } + } + + //} + ioc_inode_unlock (ioc_inode); + + ioc_waitq_return (waitq); + waitq = NULL; + + if (fault) { + fault = 0; + /* new page created, increase the table->cache_used */ + ioc_page_fault (ioc_inode, frame, fd, trav_offset); + } + + if (need_validate) { + need_validate = 0; + gf_log (frame->this->name, GF_LOG_DEBUG, + "sending validate request for " + "inode(%"PRId64") at offset=%"PRId64"", + fd->inode->ino, trav_offset); + ioc_cache_validate (frame, ioc_inode, fd, trav); + } + + trav_offset += table->page_size; + } + + ioc_frame_return (frame); + + if (ioc_need_prune (ioc_inode->table)) { + ioc_prune (ioc_inode->table); + } + + return; +} + + +/* + * ioc_readv - + * + * @frame: + * @this: + * @fd: + * @size: + * @offset: + * + */ +int32_t +ioc_readv (call_frame_t *frame, + xlator_t *this, + fd_t *fd, + size_t size, + off_t offset) +{ + uint64_t tmp_ioc_inode = 0; + ioc_inode_t *ioc_inode = NULL; + ioc_local_t *local = NULL; + uint32_t weight = 0; + + inode_ctx_get (fd->inode, this, &tmp_ioc_inode); + ioc_inode = (ioc_inode_t *)(long)tmp_ioc_inode; + if (!ioc_inode) { + /* caching disabled, go ahead with normal readv */ + STACK_WIND (frame, + ioc_readv_disabled_cbk, + FIRST_CHILD (frame->this), + FIRST_CHILD (frame->this)->fops->readv, + fd, + size, + offset); + return 0; + } + + if (!fd_ctx_get (fd, this, NULL)) { + /* disable caching for this fd, go ahead with normal readv */ + STACK_WIND (frame, + ioc_readv_disabled_cbk, + FIRST_CHILD (frame->this), + FIRST_CHILD (frame->this)->fops->readv, + fd, + size, + offset); + return 0; + } + + local = (ioc_local_t *) CALLOC (1, sizeof (ioc_local_t)); + ERR_ABORT (local); + INIT_LIST_HEAD (&local->fill_list); + + frame->local = local; + local->pending_offset = offset; + local->pending_size = size; + local->offset = offset; + local->size = size; + local->inode = ioc_inode; + + gf_log (this->name, GF_LOG_DEBUG, + "NEW REQ (%p) offset = %"PRId64" && size = %"GF_PRI_SIZET"", + frame, offset, size); + + weight = ioc_inode->weight; + + ioc_table_lock (ioc_inode->table); + { + list_move_tail (&ioc_inode->inode_lru, + &ioc_inode->table->inode_lru[weight]); + } + ioc_table_unlock (ioc_inode->table); + + dispatch_requests (frame, ioc_inode, fd, offset, size); + + return 0; +} + +/* + * ioc_writev_cbk - + * + * @frame: + * @cookie: + * @this: + * @op_ret: + * @op_errno: + * + */ +int32_t +ioc_writev_cbk (call_frame_t *frame, + void *cookie, + xlator_t *this, + int32_t op_ret, + int32_t op_errno, + struct stat *stbuf) +{ + ioc_local_t *local = frame->local; + uint64_t ioc_inode = 0; + + inode_ctx_get (local->fd->inode, this, &ioc_inode); + + if (ioc_inode) + ioc_inode_flush ((ioc_inode_t *)(long)ioc_inode); + + STACK_UNWIND (frame, op_ret, op_errno, stbuf); + return 0; +} + +/* + * ioc_writev + * + * @frame: + * @this: + * @fd: + * @vector: + * @count: + * @offset: + * + */ +int32_t +ioc_writev (call_frame_t *frame, + xlator_t *this, + fd_t *fd, + struct iovec *vector, + int32_t count, + off_t offset) +{ + ioc_local_t *local = NULL; + uint64_t ioc_inode = 0; + + local = CALLOC (1, sizeof (ioc_local_t)); + ERR_ABORT (local); + + /* TODO: why is it not fd_ref'ed */ + local->fd = fd; + frame->local = local; + + inode_ctx_get (fd->inode, this, &ioc_inode); + if (ioc_inode) + ioc_inode_flush ((ioc_inode_t *)(long)ioc_inode); + + STACK_WIND (frame, + ioc_writev_cbk, + FIRST_CHILD(this), + FIRST_CHILD(this)->fops->writev, + fd, + vector, + count, + offset); + + return 0; +} + +/* + * ioc_truncate_cbk - + * + * @frame: + * @cookie: + * @this: + * @op_ret: + * @op_errno: + * @buf: + * + */ +int32_t +ioc_truncate_cbk (call_frame_t *frame, + void *cookie, + xlator_t *this, + int32_t op_ret, + int32_t op_errno, + struct stat *buf) +{ + + STACK_UNWIND (frame, op_ret, op_errno, buf); + return 0; +} + +/* + * ioc_truncate - + * + * @frame: + * @this: + * @loc: + * @offset: + * + */ +int32_t +ioc_truncate (call_frame_t *frame, + xlator_t *this, + loc_t *loc, + off_t offset) +{ + uint64_t ioc_inode = 0; + inode_ctx_get (loc->inode, this, &ioc_inode); + + if (ioc_inode) + ioc_inode_flush ((ioc_inode_t *)(long)ioc_inode); + + STACK_WIND (frame, + ioc_truncate_cbk, + FIRST_CHILD(this), + FIRST_CHILD(this)->fops->truncate, + loc, + offset); + return 0; +} + +/* + * ioc_ftruncate - + * + * @frame: + * @this: + * @fd: + * @offset: + * + */ +int32_t +ioc_ftruncate (call_frame_t *frame, + xlator_t *this, + fd_t *fd, + off_t offset) +{ + uint64_t ioc_inode = 0; + inode_ctx_get (fd->inode, this, &ioc_inode); + + if (ioc_inode) + ioc_inode_flush ((ioc_inode_t *)(long)ioc_inode); + + STACK_WIND (frame, + ioc_truncate_cbk, + FIRST_CHILD(this), + FIRST_CHILD(this)->fops->ftruncate, + fd, + offset); + return 0; +} + +int32_t +ioc_lk_cbk (call_frame_t *frame, + void *cookie, + xlator_t *this, + int32_t op_ret, + int32_t op_errno, + struct flock *lock) +{ + STACK_UNWIND (frame, op_ret, op_errno, lock); + return 0; +} + +int32_t +ioc_lk (call_frame_t *frame, + xlator_t *this, + fd_t *fd, + int32_t cmd, + struct flock *lock) +{ + ioc_inode_t *ioc_inode = NULL; + uint64_t tmp_inode = 0; + + inode_ctx_get (fd->inode, this, &tmp_inode); + ioc_inode = (ioc_inode_t *)(long)tmp_inode; + if (!ioc_inode) { + gf_log (this->name, GF_LOG_ERROR, + "inode context is NULL: returning EBADFD"); + STACK_UNWIND (frame, -1, EBADFD, NULL); + return 0; + } + + ioc_inode_lock (ioc_inode); + { + gettimeofday (&ioc_inode->tv, NULL); + } + ioc_inode_unlock (ioc_inode); + + STACK_WIND (frame, ioc_lk_cbk, + FIRST_CHILD (this), + FIRST_CHILD (this)->fops->lk, fd, cmd, lock); + return 0; +} + +int32_t +ioc_get_priority_list (const char *opt_str, struct list_head *first) +{ + int32_t max_pri = 0; + char *tmp_str = NULL; + char *tmp_str1 = NULL; + char *tmp_str2 = NULL; + char *dup_str = NULL; + char *stripe_str = NULL; + char *pattern = NULL; + char *priority = NULL; + char *string = strdup (opt_str); + struct ioc_priority *curr = NULL; + + /* Get the pattern for cache priority. + * "option priority *.jpg:1,abc*:2" etc + */ + /* TODO: inode_lru in table is statically hard-coded to 5, + * should be changed to run-time configuration + */ + stripe_str = strtok_r (string, ",", &tmp_str); + while (stripe_str) { + curr = CALLOC (1, sizeof (struct ioc_priority)); + ERR_ABORT (curr); + list_add_tail (&curr->list, first); + + dup_str = strdup (stripe_str); + pattern = strtok_r (dup_str, ":", &tmp_str1); + if (!pattern) + return -1; + priority = strtok_r (NULL, ":", &tmp_str1); + if (!priority) + return -1; + gf_log ("io-cache", + GF_LOG_DEBUG, + "ioc priority : pattern %s : priority %s", + pattern, + priority); + curr->pattern = strdup (pattern); + curr->priority = strtol (priority, &tmp_str2, 0); + if (tmp_str2 && (*tmp_str2)) + return -1; + else + max_pri = max (max_pri, curr->priority); + stripe_str = strtok_r (NULL, ",", &tmp_str); + } + + return max_pri; +} + +/* + * init - + * @this: + * + */ +int32_t +init (xlator_t *this) +{ + ioc_table_t *table; + dict_t *options = this->options; + uint32_t index = 0; + char *page_size_string = NULL; + char *cache_size_string = NULL; + + if (!this->children || this->children->next) { + gf_log (this->name, GF_LOG_ERROR, + "FATAL: io-cache not configured with exactly " + "one child"); + return -1; + } + + if (!this->parents) { + gf_log (this->name, GF_LOG_WARNING, + "dangling volume. check volfile "); + } + + table = (void *) CALLOC (1, sizeof (*table)); + ERR_ABORT (table); + + table->xl = this; + table->page_size = IOC_PAGE_SIZE; + table->cache_size = IOC_CACHE_SIZE; + + if (dict_get (options, "page-size")) + page_size_string = data_to_str (dict_get (options, + "page-size")); + + if (page_size_string) { + if (gf_string2bytesize (page_size_string, + &table->page_size) != 0) { + gf_log ("io-cache", GF_LOG_ERROR, + "invalid number format \"%s\" of " + "\"option page-size\"", + page_size_string); + return -1; + } + gf_log (this->name, GF_LOG_DEBUG, + "using page-size %"PRIu64"", table->page_size); + } + + if (dict_get (options, "cache-size")) + cache_size_string = data_to_str (dict_get (options, + "cache-size")); + if (cache_size_string) { + if (gf_string2bytesize (cache_size_string, + &table->cache_size) != 0) { + gf_log ("io-cache", GF_LOG_ERROR, + "invalid number format \"%s\" of " + "\"option cache-size\"", + cache_size_string); + return -1; + } + + gf_log (this->name, GF_LOG_DEBUG, + "using cache-size %"PRIu64"", table->cache_size); + } + + table->cache_timeout = 1; + + if (dict_get (options, "cache-timeout")) { + table->cache_timeout = + data_to_uint32 (dict_get (options, + "cache-timeout")); + gf_log (this->name, GF_LOG_DEBUG, + "Using %d seconds to revalidate cache", + table->cache_timeout); + } + + INIT_LIST_HEAD (&table->priority_list); + if (dict_get (options, "priority")) { + char *option_list = data_to_str (dict_get (options, + "priority")); + gf_log (this->name, GF_LOG_DEBUG, + "option path %s", option_list); + /* parse the list of pattern:priority */ + table->max_pri = ioc_get_priority_list (option_list, + &table->priority_list); + + if (table->max_pri == -1) + return -1; + } + table->max_pri ++; + INIT_LIST_HEAD (&table->inodes); + + table->inode_lru = CALLOC (table->max_pri, sizeof (struct list_head)); + ERR_ABORT (table->inode_lru); + for (index = 0; index < (table->max_pri); index++) + INIT_LIST_HEAD (&table->inode_lru[index]); + + pthread_mutex_init (&table->table_lock, NULL); + this->private = table; + return 0; +} + +/* + * fini - + * + * @this: + * + */ +void +fini (xlator_t *this) +{ + ioc_table_t *table = this->private; + + pthread_mutex_destroy (&table->table_lock); + FREE (table); + + this->private = NULL; + return; +} + +struct xlator_fops fops = { + .open = ioc_open, + .create = ioc_create, + .readv = ioc_readv, + .writev = ioc_writev, + .truncate = ioc_truncate, + .ftruncate = ioc_ftruncate, + .utimens = ioc_utimens, + .lookup = ioc_lookup, + .lk = ioc_lk +}; + +struct xlator_mops mops = { +}; + +struct xlator_cbks cbks = { + .forget = ioc_forget, + .release = ioc_release +}; + +struct volume_options options[] = { + { .key = {"priority"}, + .type = GF_OPTION_TYPE_ANY + }, + { .key = {"cache-timeout", "force-revalidate-timeout"}, + .type = GF_OPTION_TYPE_INT, + .min = 0, + .max = 60 + }, + { .key = {"page-size"}, + .type = GF_OPTION_TYPE_SIZET, + .min = 16 * GF_UNIT_KB, + .max = 4 * GF_UNIT_MB + }, + { .key = {"cache-size"}, + .type = GF_OPTION_TYPE_SIZET, + .min = 4 * GF_UNIT_MB, + .max = 6 * GF_UNIT_GB + }, + { .key = {NULL} }, +}; 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