From 35acfa0fc609f2a2cd95cef4a6a9c3a5c38f1778 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Fabian=20Silva=20Delgado?= Date: Sat, 26 Dec 2015 16:00:37 -0300 Subject: Add support for the exFAT file system, fix hangs on older intel hardware and update AUFS --- fs/exfat/exfat_cache.c | 780 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 780 insertions(+) create mode 100644 fs/exfat/exfat_cache.c (limited to 'fs/exfat/exfat_cache.c') diff --git a/fs/exfat/exfat_cache.c b/fs/exfat/exfat_cache.c new file mode 100644 index 000000000..e6ca88b8e --- /dev/null +++ b/fs/exfat/exfat_cache.c @@ -0,0 +1,780 @@ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program 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 2 + * of the License, or (at your option) any later version. + * + * This program 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, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_cache.c */ +/* PURPOSE : exFAT Cache Manager */ +/* (FAT Cache & Buffer Cache) */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Sung-Kwan Kim] : first writing */ +/* */ +/************************************************************************/ + +#include "exfat_config.h" +#include "exfat_data.h" + +#include "exfat_cache.h" +#include "exfat_super.h" +#include "exfat_core.h" + +/*----------------------------------------------------------------------*/ +/* Global Variable Definitions */ +/*----------------------------------------------------------------------*/ + +#define sm_P(s) +#define sm_V(s) + +static s32 __FAT_read(struct super_block *sb, u32 loc, u32 *content); +static s32 __FAT_write(struct super_block *sb, u32 loc, u32 content); + +static BUF_CACHE_T *FAT_cache_find(struct super_block *sb, u32 sec); +static BUF_CACHE_T *FAT_cache_get(struct super_block *sb, u32 sec); +static void FAT_cache_insert_hash(struct super_block *sb, BUF_CACHE_T *bp); +static void FAT_cache_remove_hash(BUF_CACHE_T *bp); + +static u8 *__buf_getblk(struct super_block *sb, u32 sec); + +static BUF_CACHE_T *buf_cache_find(struct super_block *sb, u32 sec); +static BUF_CACHE_T *buf_cache_get(struct super_block *sb, u32 sec); +static void buf_cache_insert_hash(struct super_block *sb, BUF_CACHE_T *bp); +static void buf_cache_remove_hash(BUF_CACHE_T *bp); + +static void push_to_mru(BUF_CACHE_T *bp, BUF_CACHE_T *list); +static void push_to_lru(BUF_CACHE_T *bp, BUF_CACHE_T *list); +static void move_to_mru(BUF_CACHE_T *bp, BUF_CACHE_T *list); +static void move_to_lru(BUF_CACHE_T *bp, BUF_CACHE_T *list); + +/*======================================================================*/ +/* Cache Initialization Functions */ +/*======================================================================*/ + +s32 buf_init(struct super_block *sb) +{ + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + int i; + + /* LRU list */ + p_fs->FAT_cache_lru_list.next = p_fs->FAT_cache_lru_list.prev = &p_fs->FAT_cache_lru_list; + + for (i = 0; i < FAT_CACHE_SIZE; i++) { + p_fs->FAT_cache_array[i].drv = -1; + p_fs->FAT_cache_array[i].sec = ~0; + p_fs->FAT_cache_array[i].flag = 0; + p_fs->FAT_cache_array[i].buf_bh = NULL; + p_fs->FAT_cache_array[i].prev = p_fs->FAT_cache_array[i].next = NULL; + push_to_mru(&(p_fs->FAT_cache_array[i]), &p_fs->FAT_cache_lru_list); + } + + p_fs->buf_cache_lru_list.next = p_fs->buf_cache_lru_list.prev = &p_fs->buf_cache_lru_list; + + for (i = 0; i < BUF_CACHE_SIZE; i++) { + p_fs->buf_cache_array[i].drv = -1; + p_fs->buf_cache_array[i].sec = ~0; + p_fs->buf_cache_array[i].flag = 0; + p_fs->buf_cache_array[i].buf_bh = NULL; + p_fs->buf_cache_array[i].prev = p_fs->buf_cache_array[i].next = NULL; + push_to_mru(&(p_fs->buf_cache_array[i]), &p_fs->buf_cache_lru_list); + } + + /* HASH list */ + for (i = 0; i < FAT_CACHE_HASH_SIZE; i++) { + p_fs->FAT_cache_hash_list[i].drv = -1; + p_fs->FAT_cache_hash_list[i].sec = ~0; + p_fs->FAT_cache_hash_list[i].hash_next = p_fs->FAT_cache_hash_list[i].hash_prev = &(p_fs->FAT_cache_hash_list[i]); + } + + for (i = 0; i < FAT_CACHE_SIZE; i++) + FAT_cache_insert_hash(sb, &(p_fs->FAT_cache_array[i])); + + for (i = 0; i < BUF_CACHE_HASH_SIZE; i++) { + p_fs->buf_cache_hash_list[i].drv = -1; + p_fs->buf_cache_hash_list[i].sec = ~0; + p_fs->buf_cache_hash_list[i].hash_next = p_fs->buf_cache_hash_list[i].hash_prev = &(p_fs->buf_cache_hash_list[i]); + } + + for (i = 0; i < BUF_CACHE_SIZE; i++) + buf_cache_insert_hash(sb, &(p_fs->buf_cache_array[i])); + + return FFS_SUCCESS; +} /* end of buf_init */ + +s32 buf_shutdown(struct super_block *sb) +{ + return FFS_SUCCESS; +} /* end of buf_shutdown */ + +/*======================================================================*/ +/* FAT Read/Write Functions */ +/*======================================================================*/ + +/* in : sb, loc + * out: content + * returns 0 on success + * -1 on error + */ +s32 FAT_read(struct super_block *sb, u32 loc, u32 *content) +{ + s32 ret; + + sm_P(&f_sem); + + ret = __FAT_read(sb, loc, content); + + sm_V(&f_sem); + + return ret; +} /* end of FAT_read */ + +s32 FAT_write(struct super_block *sb, u32 loc, u32 content) +{ + s32 ret; + + sm_P(&f_sem); + + ret = __FAT_write(sb, loc, content); + + sm_V(&f_sem); + + return ret; +} /* end of FAT_write */ + +static s32 __FAT_read(struct super_block *sb, u32 loc, u32 *content) +{ + s32 off; + u32 sec, _content; + u8 *fat_sector, *fat_entry; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + if (p_fs->vol_type == FAT12) { + sec = p_fs->FAT1_start_sector + ((loc + (loc >> 1)) >> p_bd->sector_size_bits); + off = (loc + (loc >> 1)) & p_bd->sector_size_mask; + + if (off == (p_bd->sector_size-1)) { + fat_sector = FAT_getblk(sb, sec); + if (!fat_sector) + return -1; + + _content = (u32) fat_sector[off]; + + fat_sector = FAT_getblk(sb, ++sec); + if (!fat_sector) + return -1; + + _content |= (u32) fat_sector[0] << 8; + } else { + fat_sector = FAT_getblk(sb, sec); + if (!fat_sector) + return -1; + + fat_entry = &(fat_sector[off]); + _content = GET16(fat_entry); + } + + if (loc & 1) + _content >>= 4; + + _content &= 0x00000FFF; + + if (_content >= CLUSTER_16(0x0FF8)) { + *content = CLUSTER_32(~0); + return 0; + } else { + *content = CLUSTER_32(_content); + return 0; + } + } else if (p_fs->vol_type == FAT16) { + sec = p_fs->FAT1_start_sector + (loc >> (p_bd->sector_size_bits-1)); + off = (loc << 1) & p_bd->sector_size_mask; + + fat_sector = FAT_getblk(sb, sec); + if (!fat_sector) + return -1; + + fat_entry = &(fat_sector[off]); + + _content = GET16_A(fat_entry); + + _content &= 0x0000FFFF; + + if (_content >= CLUSTER_16(0xFFF8)) { + *content = CLUSTER_32(~0); + return 0; + } else { + *content = CLUSTER_32(_content); + return 0; + } + } else if (p_fs->vol_type == FAT32) { + sec = p_fs->FAT1_start_sector + (loc >> (p_bd->sector_size_bits-2)); + off = (loc << 2) & p_bd->sector_size_mask; + + fat_sector = FAT_getblk(sb, sec); + if (!fat_sector) + return -1; + + fat_entry = &(fat_sector[off]); + + _content = GET32_A(fat_entry); + + _content &= 0x0FFFFFFF; + + if (_content >= CLUSTER_32(0x0FFFFFF8)) { + *content = CLUSTER_32(~0); + return 0; + } else { + *content = CLUSTER_32(_content); + return 0; + } + } else { + sec = p_fs->FAT1_start_sector + (loc >> (p_bd->sector_size_bits-2)); + off = (loc << 2) & p_bd->sector_size_mask; + + fat_sector = FAT_getblk(sb, sec); + if (!fat_sector) + return -1; + + fat_entry = &(fat_sector[off]); + _content = GET32_A(fat_entry); + + if (_content >= CLUSTER_32(0xFFFFFFF8)) { + *content = CLUSTER_32(~0); + return 0; + } else { + *content = CLUSTER_32(_content); + return 0; + } + } + + *content = CLUSTER_32(~0); + return 0; +} /* end of __FAT_read */ + +static s32 __FAT_write(struct super_block *sb, u32 loc, u32 content) +{ + s32 off; + u32 sec; + u8 *fat_sector, *fat_entry; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + if (p_fs->vol_type == FAT12) { + + content &= 0x00000FFF; + + sec = p_fs->FAT1_start_sector + ((loc + (loc >> 1)) >> p_bd->sector_size_bits); + off = (loc + (loc >> 1)) & p_bd->sector_size_mask; + + fat_sector = FAT_getblk(sb, sec); + if (!fat_sector) + return -1; + + if (loc & 1) { /* odd */ + + content <<= 4; + + if (off == (p_bd->sector_size-1)) { + fat_sector[off] = (u8)(content | (fat_sector[off] & 0x0F)); + FAT_modify(sb, sec); + + fat_sector = FAT_getblk(sb, ++sec); + if (!fat_sector) + return -1; + + fat_sector[0] = (u8)(content >> 8); + } else { + fat_entry = &(fat_sector[off]); + content |= GET16(fat_entry) & 0x000F; + + SET16(fat_entry, content); + } + } else { /* even */ + fat_sector[off] = (u8)(content); + + if (off == (p_bd->sector_size-1)) { + fat_sector[off] = (u8)(content); + FAT_modify(sb, sec); + + fat_sector = FAT_getblk(sb, ++sec); + fat_sector[0] = (u8)((fat_sector[0] & 0xF0) | (content >> 8)); + } else { + fat_entry = &(fat_sector[off]); + content |= GET16(fat_entry) & 0xF000; + + SET16(fat_entry, content); + } + } + } + + else if (p_fs->vol_type == FAT16) { + + content &= 0x0000FFFF; + + sec = p_fs->FAT1_start_sector + (loc >> (p_bd->sector_size_bits-1)); + off = (loc << 1) & p_bd->sector_size_mask; + + fat_sector = FAT_getblk(sb, sec); + if (!fat_sector) + return -1; + + fat_entry = &(fat_sector[off]); + + SET16_A(fat_entry, content); + } + + else if (p_fs->vol_type == FAT32) { + + content &= 0x0FFFFFFF; + + sec = p_fs->FAT1_start_sector + (loc >> (p_bd->sector_size_bits-2)); + off = (loc << 2) & p_bd->sector_size_mask; + + fat_sector = FAT_getblk(sb, sec); + if (!fat_sector) + return -1; + + fat_entry = &(fat_sector[off]); + + content |= GET32_A(fat_entry) & 0xF0000000; + + SET32_A(fat_entry, content); + } + + else { /* p_fs->vol_type == EXFAT */ + + sec = p_fs->FAT1_start_sector + (loc >> (p_bd->sector_size_bits-2)); + off = (loc << 2) & p_bd->sector_size_mask; + + fat_sector = FAT_getblk(sb, sec); + if (!fat_sector) + return -1; + + fat_entry = &(fat_sector[off]); + + SET32_A(fat_entry, content); + } + + FAT_modify(sb, sec); + return 0; +} /* end of __FAT_write */ + +u8 *FAT_getblk(struct super_block *sb, u32 sec) +{ + BUF_CACHE_T *bp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + bp = FAT_cache_find(sb, sec); + if (bp != NULL) { + move_to_mru(bp, &p_fs->FAT_cache_lru_list); + return bp->buf_bh->b_data; + } + + bp = FAT_cache_get(sb, sec); + + FAT_cache_remove_hash(bp); + + bp->drv = p_fs->drv; + bp->sec = sec; + bp->flag = 0; + + FAT_cache_insert_hash(sb, bp); + + if (sector_read(sb, sec, &(bp->buf_bh), 1) != FFS_SUCCESS) { + FAT_cache_remove_hash(bp); + bp->drv = -1; + bp->sec = ~0; + bp->flag = 0; + bp->buf_bh = NULL; + + move_to_lru(bp, &p_fs->FAT_cache_lru_list); + return NULL; + } + + return bp->buf_bh->b_data; +} /* end of FAT_getblk */ + +void FAT_modify(struct super_block *sb, u32 sec) +{ + BUF_CACHE_T *bp; + + bp = FAT_cache_find(sb, sec); + if (bp != NULL) + sector_write(sb, sec, bp->buf_bh, 0); +} /* end of FAT_modify */ + +void FAT_release_all(struct super_block *sb) +{ + BUF_CACHE_T *bp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + sm_P(&f_sem); + + bp = p_fs->FAT_cache_lru_list.next; + while (bp != &p_fs->FAT_cache_lru_list) { + if (bp->drv == p_fs->drv) { + bp->drv = -1; + bp->sec = ~0; + bp->flag = 0; + + if (bp->buf_bh) { + __brelse(bp->buf_bh); + bp->buf_bh = NULL; + } + } + bp = bp->next; + } + + sm_V(&f_sem); +} /* end of FAT_release_all */ + +void FAT_sync(struct super_block *sb) +{ + BUF_CACHE_T *bp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + sm_P(&f_sem); + + bp = p_fs->FAT_cache_lru_list.next; + while (bp != &p_fs->FAT_cache_lru_list) { + if ((bp->drv == p_fs->drv) && (bp->flag & DIRTYBIT)) { + sync_dirty_buffer(bp->buf_bh); + bp->flag &= ~(DIRTYBIT); + } + bp = bp->next; + } + + sm_V(&f_sem); +} /* end of FAT_sync */ + +static BUF_CACHE_T *FAT_cache_find(struct super_block *sb, u32 sec) +{ + s32 off; + BUF_CACHE_T *bp, *hp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + off = (sec + (sec >> p_fs->sectors_per_clu_bits)) & (FAT_CACHE_HASH_SIZE - 1); + + hp = &(p_fs->FAT_cache_hash_list[off]); + for (bp = hp->hash_next; bp != hp; bp = bp->hash_next) { + if ((bp->drv == p_fs->drv) && (bp->sec == sec)) { + + WARN(!bp->buf_bh, "[EXFAT] FAT_cache has no bh. " + "It will make system panic.\n"); + + touch_buffer(bp->buf_bh); + return bp; + } + } + return NULL; +} /* end of FAT_cache_find */ + +static BUF_CACHE_T *FAT_cache_get(struct super_block *sb, u32 sec) +{ + BUF_CACHE_T *bp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + bp = p_fs->FAT_cache_lru_list.prev; + + + move_to_mru(bp, &p_fs->FAT_cache_lru_list); + return bp; +} /* end of FAT_cache_get */ + +static void FAT_cache_insert_hash(struct super_block *sb, BUF_CACHE_T *bp) +{ + s32 off; + BUF_CACHE_T *hp; + FS_INFO_T *p_fs; + + p_fs = &(EXFAT_SB(sb)->fs_info); + off = (bp->sec + (bp->sec >> p_fs->sectors_per_clu_bits)) & (FAT_CACHE_HASH_SIZE-1); + + hp = &(p_fs->FAT_cache_hash_list[off]); + bp->hash_next = hp->hash_next; + bp->hash_prev = hp; + hp->hash_next->hash_prev = bp; + hp->hash_next = bp; +} /* end of FAT_cache_insert_hash */ + +static void FAT_cache_remove_hash(BUF_CACHE_T *bp) +{ + (bp->hash_prev)->hash_next = bp->hash_next; + (bp->hash_next)->hash_prev = bp->hash_prev; +} /* end of FAT_cache_remove_hash */ + +/*======================================================================*/ +/* Buffer Read/Write Functions */ +/*======================================================================*/ + +u8 *buf_getblk(struct super_block *sb, u32 sec) +{ + u8 *buf; + + sm_P(&b_sem); + + buf = __buf_getblk(sb, sec); + + sm_V(&b_sem); + + return buf; +} /* end of buf_getblk */ + +static u8 *__buf_getblk(struct super_block *sb, u32 sec) +{ + BUF_CACHE_T *bp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + bp = buf_cache_find(sb, sec); + if (bp != NULL) { + move_to_mru(bp, &p_fs->buf_cache_lru_list); + return bp->buf_bh->b_data; + } + + bp = buf_cache_get(sb, sec); + + buf_cache_remove_hash(bp); + + bp->drv = p_fs->drv; + bp->sec = sec; + bp->flag = 0; + + buf_cache_insert_hash(sb, bp); + + if (sector_read(sb, sec, &(bp->buf_bh), 1) != FFS_SUCCESS) { + buf_cache_remove_hash(bp); + bp->drv = -1; + bp->sec = ~0; + bp->flag = 0; + bp->buf_bh = NULL; + + move_to_lru(bp, &p_fs->buf_cache_lru_list); + return NULL; + } + + return bp->buf_bh->b_data; + +} /* end of __buf_getblk */ + +void buf_modify(struct super_block *sb, u32 sec) +{ + BUF_CACHE_T *bp; + + sm_P(&b_sem); + + bp = buf_cache_find(sb, sec); + if (likely(bp != NULL)) + sector_write(sb, sec, bp->buf_bh, 0); + + WARN(!bp, "[EXFAT] failed to find buffer_cache(sector:%u).\n", sec); + + sm_V(&b_sem); +} /* end of buf_modify */ + +void buf_lock(struct super_block *sb, u32 sec) +{ + BUF_CACHE_T *bp; + + sm_P(&b_sem); + + bp = buf_cache_find(sb, sec); + if (likely(bp != NULL)) + bp->flag |= LOCKBIT; + + WARN(!bp, "[EXFAT] failed to find buffer_cache(sector:%u).\n", sec); + + sm_V(&b_sem); +} /* end of buf_lock */ + +void buf_unlock(struct super_block *sb, u32 sec) +{ + BUF_CACHE_T *bp; + + sm_P(&b_sem); + + bp = buf_cache_find(sb, sec); + if (likely(bp != NULL)) + bp->flag &= ~(LOCKBIT); + + WARN(!bp, "[EXFAT] failed to find buffer_cache(sector:%u).\n", sec); + + sm_V(&b_sem); +} /* end of buf_unlock */ + +void buf_release(struct super_block *sb, u32 sec) +{ + BUF_CACHE_T *bp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + sm_P(&b_sem); + + bp = buf_cache_find(sb, sec); + if (likely(bp != NULL)) { + bp->drv = -1; + bp->sec = ~0; + bp->flag = 0; + + if (bp->buf_bh) { + __brelse(bp->buf_bh); + bp->buf_bh = NULL; + } + + move_to_lru(bp, &p_fs->buf_cache_lru_list); + } + + sm_V(&b_sem); +} /* end of buf_release */ + +void buf_release_all(struct super_block *sb) +{ + BUF_CACHE_T *bp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + sm_P(&b_sem); + + bp = p_fs->buf_cache_lru_list.next; + while (bp != &p_fs->buf_cache_lru_list) { + if (bp->drv == p_fs->drv) { + bp->drv = -1; + bp->sec = ~0; + bp->flag = 0; + + if (bp->buf_bh) { + __brelse(bp->buf_bh); + bp->buf_bh = NULL; + } + } + bp = bp->next; + } + + sm_V(&b_sem); +} /* end of buf_release_all */ + +void buf_sync(struct super_block *sb) +{ + BUF_CACHE_T *bp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + sm_P(&b_sem); + + bp = p_fs->buf_cache_lru_list.next; + while (bp != &p_fs->buf_cache_lru_list) { + if ((bp->drv == p_fs->drv) && (bp->flag & DIRTYBIT)) { + sync_dirty_buffer(bp->buf_bh); + bp->flag &= ~(DIRTYBIT); + } + bp = bp->next; + } + + sm_V(&b_sem); +} /* end of buf_sync */ + +static BUF_CACHE_T *buf_cache_find(struct super_block *sb, u32 sec) +{ + s32 off; + BUF_CACHE_T *bp, *hp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + off = (sec + (sec >> p_fs->sectors_per_clu_bits)) & (BUF_CACHE_HASH_SIZE - 1); + + hp = &(p_fs->buf_cache_hash_list[off]); + for (bp = hp->hash_next; bp != hp; bp = bp->hash_next) { + if ((bp->drv == p_fs->drv) && (bp->sec == sec)) { + touch_buffer(bp->buf_bh); + return bp; + } + } + return NULL; +} /* end of buf_cache_find */ + +static BUF_CACHE_T *buf_cache_get(struct super_block *sb, u32 sec) +{ + BUF_CACHE_T *bp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + bp = p_fs->buf_cache_lru_list.prev; + while (bp->flag & LOCKBIT) + bp = bp->prev; + + + move_to_mru(bp, &p_fs->buf_cache_lru_list); + return bp; +} /* end of buf_cache_get */ + +static void buf_cache_insert_hash(struct super_block *sb, BUF_CACHE_T *bp) +{ + s32 off; + BUF_CACHE_T *hp; + FS_INFO_T *p_fs; + + p_fs = &(EXFAT_SB(sb)->fs_info); + off = (bp->sec + (bp->sec >> p_fs->sectors_per_clu_bits)) & (BUF_CACHE_HASH_SIZE-1); + + hp = &(p_fs->buf_cache_hash_list[off]); + bp->hash_next = hp->hash_next; + bp->hash_prev = hp; + hp->hash_next->hash_prev = bp; + hp->hash_next = bp; +} /* end of buf_cache_insert_hash */ + +static void buf_cache_remove_hash(BUF_CACHE_T *bp) +{ + (bp->hash_prev)->hash_next = bp->hash_next; + (bp->hash_next)->hash_prev = bp->hash_prev; +} /* end of buf_cache_remove_hash */ + +/*======================================================================*/ +/* Local Function Definitions */ +/*======================================================================*/ + +static void push_to_mru(BUF_CACHE_T *bp, BUF_CACHE_T *list) +{ + bp->next = list->next; + bp->prev = list; + list->next->prev = bp; + list->next = bp; +} /* end of buf_cache_push_to_mru */ + +static void push_to_lru(BUF_CACHE_T *bp, BUF_CACHE_T *list) +{ + bp->prev = list->prev; + bp->next = list; + list->prev->next = bp; + list->prev = bp; +} /* end of buf_cache_push_to_lru */ + +static void move_to_mru(BUF_CACHE_T *bp, BUF_CACHE_T *list) +{ + bp->prev->next = bp->next; + bp->next->prev = bp->prev; + push_to_mru(bp, list); +} /* end of buf_cache_move_to_mru */ + +static void move_to_lru(BUF_CACHE_T *bp, BUF_CACHE_T *list) +{ + bp->prev->next = bp->next; + bp->next->prev = bp->prev; + push_to_lru(bp, list); +} /* end of buf_cache_move_to_lru */ -- cgit v1.2.3