/* Copyright (c) 2007-2009 Gluster, Inc. 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 . */ #ifndef __IO_CACHE_H #define __IO_CACHE_H #ifndef _CONFIG_H #define _CONFIG_H #include "config.h" #endif #include #include "compat-errno.h" #include "glusterfs.h" #include "logging.h" #include "dict.h" #include "xlator.h" #include "common-utils.h" #include "call-stub.h" #include "rbthash.h" #include "hashfn.h" #include #include #define IOC_PAGE_SIZE (1024 * 128) /* 128KB */ #define IOC_CACHE_SIZE (32 * 1024 * 1024) #define IOC_PAGE_TABLE_BUCKET_COUNT 4096 struct ioc_table; struct ioc_local; struct ioc_page; struct ioc_inode; struct ioc_priority { struct list_head list; char *pattern; uint32_t priority; }; /* * ioc_waitq - this structure is used to represents the waiting * frames on a page * * @next: pointer to next object in waitq * @data: pointer to the frame which is waiting */ struct ioc_waitq { struct ioc_waitq *next; void *data; off_t pending_offset; size_t pending_size; }; /* * ioc_fill - * */ struct ioc_fill { struct list_head list; /* list of ioc_fill structures of a frame */ off_t offset; size_t size; struct iovec *vector; int32_t count; struct iobref *iobref; }; struct ioc_local { mode_t mode; int32_t flags; loc_t file_loc; off_t offset; size_t size; int32_t op_ret; int32_t op_errno; struct list_head fill_list; /* list of ioc_fill structures */ off_t pending_offset; /* * offset from this frame should * continue */ size_t pending_size; /* * size of data this frame is waiting * on */ struct ioc_inode *inode; int32_t wait_count; pthread_mutex_t local_lock; struct ioc_waitq *waitq; void *stub; fd_t *fd; int32_t need_xattr; dict_t *xattr_req; }; /* * ioc_page - structure to store page of data from file * */ struct ioc_page { struct list_head page_lru; struct ioc_inode *inode; /* inode this page belongs to */ struct ioc_priority *priority; char dirty; char ready; struct iovec *vector; int32_t count; off_t offset; size_t size; struct ioc_waitq *waitq; struct iobref *iobref; pthread_mutex_t page_lock; }; struct ioc_cache { rbthash_table_t *page_table; struct list_head page_lru; time_t mtime; /* * mtime of the server file when last * cached */ struct timeval tv; /* * time-stamp at last re-validate */ }; struct ioc_inode { struct ioc_table *table; struct ioc_cache cache; struct list_head inode_list; /* * list of inodes, maintained by * io-cache translator */ struct list_head inode_lru; struct ioc_waitq *waitq; pthread_mutex_t inode_lock; uint32_t weight; /* * weight of the inode, increases * on each read */ }; struct ioc_table { uint64_t page_size; uint64_t cache_size; uint64_t cache_used; struct list_head inodes; /* list of inodes cached */ struct list_head active; struct list_head *inode_lru; struct list_head priority_list; int32_t readv_count; pthread_mutex_t table_lock; xlator_t *xl; uint32_t inode_count; int32_t cache_timeout; int32_t max_pri; }; typedef struct ioc_table ioc_table_t; typedef struct ioc_local ioc_local_t; typedef struct ioc_page ioc_page_t; typedef struct ioc_inode ioc_inode_t; typedef struct ioc_waitq ioc_waitq_t; typedef struct ioc_fill ioc_fill_t; void * str_to_ptr (char *string); char * ptr_to_str (void *ptr); 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, struct iobref *iobref); ioc_page_t * ioc_page_get (ioc_inode_t *ioc_inode, off_t offset); ioc_page_t * ioc_page_create (ioc_inode_t *ioc_inode, off_t offset); void ioc_page_fault (ioc_inode_t *ioc_inode, call_frame_t *frame, fd_t *fd, off_t offset); void ioc_wait_on_page (ioc_page_t *page, call_frame_t *frame, off_t offset, size_t size); ioc_waitq_t * ioc_page_wakeup (ioc_page_t *page); void ioc_page_flush (ioc_page_t *page); ioc_waitq_t * ioc_page_error (ioc_page_t *page, int32_t op_ret, int32_t op_errno); void ioc_page_purge (ioc_page_t *page); void ioc_frame_return (call_frame_t *frame); void ioc_waitq_return (ioc_waitq_t *waitq); int32_t ioc_frame_fill (ioc_page_t *page, call_frame_t *frame, off_t offset, size_t size); #define ioc_inode_lock(ioc_inode) \ do { \ gf_log (ioc_inode->table->xl->name, GF_LOG_TRACE, \ "locked inode(%p)", ioc_inode); \ pthread_mutex_lock (&ioc_inode->inode_lock); \ } while (0) #define ioc_inode_unlock(ioc_inode) \ do { \ gf_log (ioc_inode->table->xl->name, GF_LOG_TRACE, \ "unlocked inode(%p)", ioc_inode); \ pthread_mutex_unlock (&ioc_inode->inode_lock); \ } while (0) #define ioc_table_lock(table) \ do { \ gf_log (table->xl->name, GF_LOG_TRACE, \ "locked table(%p)", table); \ pthread_mutex_lock (&table->table_lock); \ } while (0) #define ioc_table_unlock(table) \ do { \ gf_log (table->xl->name, GF_LOG_TRACE, \ "unlocked table(%p)", table); \ pthread_mutex_unlock (&table->table_lock); \ } while (0) #define ioc_local_lock(local) \ do { \ gf_log (local->inode->table->xl->name, GF_LOG_TRACE, \ "locked local(%p)", local); \ pthread_mutex_lock (&local->local_lock); \ } while (0) #define ioc_local_unlock(local) \ do { \ gf_log (local->inode->table->xl->name, GF_LOG_TRACE, \ "unlocked local(%p)", local); \ pthread_mutex_unlock (&local->local_lock); \ } while (0) #define ioc_page_lock(page) \ do { \ gf_log (page->inode->table->xl->name, GF_LOG_TRACE, \ "locked page(%p)", page); \ pthread_mutex_lock (&page->page_lock); \ } while (0) #define ioc_page_unlock(page) \ do { \ gf_log (page->inode->table->xl->name, GF_LOG_TRACE, \ "unlocked page(%p)", page); \ pthread_mutex_unlock (&page->page_lock); \ } while (0) static inline uint64_t time_elapsed (struct timeval *now, struct timeval *then) { uint64_t sec = now->tv_sec - then->tv_sec; if (sec) return sec; return 0; } ioc_inode_t * ioc_inode_search (ioc_table_t *table, inode_t *inode); void ioc_inode_destroy (ioc_inode_t *ioc_inode); ioc_inode_t * ioc_inode_update (ioc_table_t *table, inode_t *inode, uint32_t weight); int64_t ioc_page_destroy (ioc_page_t *page); int64_t __ioc_inode_flush (ioc_inode_t *ioc_inode); void ioc_inode_flush (ioc_inode_t *ioc_inode); void ioc_inode_wakeup (call_frame_t *frame, ioc_inode_t *ioc_inode, struct stat *stbuf); int8_t ioc_cache_still_valid (ioc_inode_t *ioc_inode, struct stat *stbuf); int32_t ioc_prune (ioc_table_t *table); int32_t ioc_need_prune (ioc_table_t *table); #endif /* __IO_CACHE_H */