138 lines
4 KiB
C
138 lines
4 KiB
C
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/*
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* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _SDFAT_AMAP_H
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#define _SDFAT_AMAP_H
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#include <linux/fs.h>
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#include <linux/list.h>
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#include <linux/rbtree.h>
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/* AMAP Configuration Variable */
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#define SMART_ALLOC_N_HOT_AU (5)
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/* Allocating Destination (for smart allocator):
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* moved to sdfat.h
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*/
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/*
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* #define ALLOC_COLD_ALIGNED (1)
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* #define ALLOC_COLD_PACKING (2)
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* #define ALLOC_COLD_SEQ (4)
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*/
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/* Minimum sectors for support AMAP create */
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#define AMAP_MIN_SUPPORT_SECTORS (1048576)
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#define amap_add_hot_au(amap, au) amap_insert_to_list(au, &amap->slist_hot)
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/* singly linked list */
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struct slist_head {
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struct slist_head *next;
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struct slist_head *head;
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};
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/* AU entry type */
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typedef struct __AU_INFO_T {
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uint16_t idx; /* the index of the AU (0, 1, 2, ... ) */
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uint16_t free_clusters; /* # of available cluster */
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union {
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struct list_head head;
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struct slist_head shead;/* singly linked list head for hot list */
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};
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} AU_INFO_T;
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/* Allocation Target AU */
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typedef struct __TARGET_AU_T {
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AU_INFO_T *au; /* Working AU */
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uint16_t idx; /* Intra-AU cluster index */
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uint16_t clu_to_skip; /* Clusters to skip */
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} TARGET_AU_T;
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/* AMAP free-clusters-based node */
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typedef struct {
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struct list_head head; /* the list of AUs */
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} FCLU_NODE_T;
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/* AMAP options */
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typedef struct {
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unsigned int packing_ratio; /* Tunable packing ratio */
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unsigned int au_size; /* AU size in sectors */
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unsigned int au_align_factor; /* Hidden sectors % au_size */
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} AMAP_OPT_T;
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typedef struct __AMAP_T {
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spinlock_t amap_lock; /* obsolete */
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struct super_block *sb;
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int n_au;
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int n_clean_au, n_full_au;
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int clu_align_bias;
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uint16_t clusters_per_au;
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AU_INFO_T **au_table; /* An array of AU_INFO entries */
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AMAP_OPT_T option;
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/* Size-based AU management pool (cold) */
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FCLU_NODE_T *fclu_nodes; /* An array of listheads */
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int fclu_order; /* Page order that fclu_nodes needs */
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int fclu_hint; /* maximum # of free clusters in an AU */
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/* Hot AU list */
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unsigned int total_fclu_hot; /* Free clusters in hot list */
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struct slist_head slist_hot; /* Hot AU list */
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/* Ignored AU list */
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struct slist_head slist_ignored;
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/* Allocator variables (keep 2 AUs at maximum) */
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TARGET_AU_T cur_cold;
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TARGET_AU_T cur_hot;
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int n_need_packing;
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} AMAP_T;
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/* AU table */
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#define N_AU_PER_TABLE (int)(PAGE_SIZE / sizeof(AU_INFO_T))
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#define GET_AU(amap, i_AU) (amap->au_table[(i_AU) / N_AU_PER_TABLE] + ((i_AU) % N_AU_PER_TABLE))
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//#define MAX_CLU_PER_AU (int)(PAGE_SIZE / sizeof(FCLU_NODE_T))
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#define MAX_CLU_PER_AU (1024)
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/* Cold AU bucket <-> # of freeclusters */
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#define NODE_CLEAN(amap) (&amap->fclu_nodes[amap->clusters_per_au - 1])
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#define NODE(fclu, amap) (&amap->fclu_nodes[fclu - 1])
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#define FREE_CLUSTERS(node, amap) ((int)(node - amap->fclu_nodes) + 1)
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/* AU status */
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#define MAGIC_WORKING ((struct slist_head *)0xFFFF5091)
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#define IS_AU_HOT(au, amap) (au->shead.head == &amap->slist_hot)
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#define IS_AU_IGNORED(au, amap) (au->shead.head == &amap->slist_ignored)
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#define IS_AU_WORKING(au, amap) (au->shead.head == MAGIC_WORKING)
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#define SET_AU_WORKING(au) (au->shead.head = MAGIC_WORKING)
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/* AU <-> cluster */
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#define i_AU_of_CLU(amap, clu) ((amap->clu_align_bias + clu) / amap->clusters_per_au)
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#define CLU_of_i_AU(amap, i_au, idx) \
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((uint32_t)(i_au) * (uint32_t)amap->clusters_per_au + (idx) - amap->clu_align_bias)
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/*
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* NOTE : AMAP internal functions are moved to core.h
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*/
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#endif /* _SDFAT_AMAP_H */
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