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path: root/drivers/staging/exfat/exfat_cache.c
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Diffstat (limited to 'drivers/staging/exfat/exfat_cache.c')
-rw-r--r--drivers/staging/exfat/exfat_cache.c555
1 files changed, 0 insertions, 555 deletions
diff --git a/drivers/staging/exfat/exfat_cache.c b/drivers/staging/exfat/exfat_cache.c
deleted file mode 100644
index 3fd5604058a9..000000000000
--- a/drivers/staging/exfat/exfat_cache.c
+++ /dev/null
@@ -1,555 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
- */
-
-#include <linux/buffer_head.h>
-#include <linux/fs.h>
-#include <linux/mutex.h>
-#include "exfat.h"
-
-#define LOCKBIT 0x01
-#define DIRTYBIT 0x02
-
-/* Local variables */
-static DEFINE_MUTEX(f_mutex);
-static DEFINE_MUTEX(b_mutex);
-
-static struct buf_cache_t *FAT_cache_find(struct super_block *sb, sector_t sec)
-{
- s32 off;
- struct buf_cache_t *bp, *hp;
- struct 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;
-}
-
-static void push_to_mru(struct buf_cache_t *bp, struct buf_cache_t *list)
-{
- bp->next = list->next;
- bp->prev = list;
- list->next->prev = bp;
- list->next = bp;
-}
-
-static void push_to_lru(struct buf_cache_t *bp, struct buf_cache_t *list)
-{
- bp->prev = list->prev;
- bp->next = list;
- list->prev->next = bp;
- list->prev = bp;
-}
-
-static void move_to_mru(struct buf_cache_t *bp, struct buf_cache_t *list)
-{
- bp->prev->next = bp->next;
- bp->next->prev = bp->prev;
- push_to_mru(bp, list);
-}
-
-static void move_to_lru(struct buf_cache_t *bp, struct buf_cache_t *list)
-{
- bp->prev->next = bp->next;
- bp->next->prev = bp->prev;
- push_to_lru(bp, list);
-}
-
-static struct buf_cache_t *FAT_cache_get(struct super_block *sb, sector_t sec)
-{
- struct buf_cache_t *bp;
- struct 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;
-}
-
-static void FAT_cache_insert_hash(struct super_block *sb,
- struct buf_cache_t *bp)
-{
- s32 off;
- struct buf_cache_t *hp;
- struct 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;
-}
-
-static void FAT_cache_remove_hash(struct buf_cache_t *bp)
-{
- (bp->hash_prev)->hash_next = bp->hash_next;
- (bp->hash_next)->hash_prev = bp->hash_prev;
-}
-
-static void buf_cache_insert_hash(struct super_block *sb,
- struct buf_cache_t *bp)
-{
- s32 off;
- struct buf_cache_t *hp;
- struct 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;
-}
-
-static void buf_cache_remove_hash(struct buf_cache_t *bp)
-{
- (bp->hash_prev)->hash_next = bp->hash_next;
- (bp->hash_next)->hash_prev = bp->hash_prev;
-}
-
-void exfat_buf_init(struct super_block *sb)
-{
- struct 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;
- 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 = NULL;
- 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;
- 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 = NULL;
- 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];
- 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];
- 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]);
-}
-
-void exfat_buf_shutdown(struct super_block *sb)
-{
-}
-
-static int __exfat_fat_read(struct super_block *sb, u32 loc, u32 *content)
-{
- s32 off;
- u32 _content;
- sector_t sec;
- u8 *fat_sector, *fat_entry;
- struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
- struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
-
- sec = p_fs->FAT1_start_sector +
- (loc >> (p_bd->sector_size_bits - 2));
- off = (loc << 2) & p_bd->sector_size_mask;
-
- fat_sector = exfat_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;
- }
- *content = CLUSTER_32(_content);
- return 0;
-}
-
-/* in : sb, loc
- * out: content
- * returns 0 on success
- * -1 on error
- */
-int exfat_fat_read(struct super_block *sb, u32 loc, u32 *content)
-{
- s32 ret;
-
- mutex_lock(&f_mutex);
- ret = __exfat_fat_read(sb, loc, content);
- mutex_unlock(&f_mutex);
-
- return ret;
-}
-
-static s32 __exfat_fat_write(struct super_block *sb, u32 loc, u32 content)
-{
- s32 off;
- sector_t sec;
- u8 *fat_sector, *fat_entry;
- struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
- struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
-
- sec = p_fs->FAT1_start_sector + (loc >>
- (p_bd->sector_size_bits - 2));
- off = (loc << 2) & p_bd->sector_size_mask;
-
- fat_sector = exfat_fat_getblk(sb, sec);
- if (!fat_sector)
- return -1;
-
- fat_entry = &fat_sector[off];
-
- SET32_A(fat_entry, content);
-
- exfat_fat_modify(sb, sec);
- return 0;
-}
-
-int exfat_fat_write(struct super_block *sb, u32 loc, u32 content)
-{
- s32 ret;
-
- mutex_lock(&f_mutex);
- ret = __exfat_fat_write(sb, loc, content);
- mutex_unlock(&f_mutex);
-
- return ret;
-}
-
-u8 *exfat_fat_getblk(struct super_block *sb, sector_t sec)
-{
- struct buf_cache_t *bp;
- struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
-
- bp = FAT_cache_find(sb, sec);
- if (bp) {
- 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) != 0) {
- 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;
-}
-
-void exfat_fat_modify(struct super_block *sb, sector_t sec)
-{
- struct buf_cache_t *bp;
-
- bp = FAT_cache_find(sb, sec);
- if (bp)
- sector_write(sb, sec, bp->buf_bh, 0);
-}
-
-void exfat_fat_release_all(struct super_block *sb)
-{
- struct buf_cache_t *bp;
- struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
-
- mutex_lock(&f_mutex);
-
- 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;
- }
-
- mutex_unlock(&f_mutex);
-}
-
-void exfat_fat_sync(struct super_block *sb)
-{
- struct buf_cache_t *bp;
- struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
-
- mutex_lock(&f_mutex);
-
- 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;
- }
-
- mutex_unlock(&f_mutex);
-}
-
-static struct buf_cache_t *buf_cache_find(struct super_block *sb, sector_t sec)
-{
- s32 off;
- struct buf_cache_t *bp, *hp;
- struct 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;
-}
-
-static struct buf_cache_t *buf_cache_get(struct super_block *sb, sector_t sec)
-{
- struct buf_cache_t *bp;
- struct 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;
-}
-
-static u8 *__exfat_buf_getblk(struct super_block *sb, sector_t sec)
-{
- struct buf_cache_t *bp;
- struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
-
- bp = buf_cache_find(sb, sec);
- if (bp) {
- 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) != 0) {
- 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;
-}
-
-u8 *exfat_buf_getblk(struct super_block *sb, sector_t sec)
-{
- u8 *buf;
-
- mutex_lock(&b_mutex);
- buf = __exfat_buf_getblk(sb, sec);
- mutex_unlock(&b_mutex);
-
- return buf;
-}
-
-void exfat_buf_modify(struct super_block *sb, sector_t sec)
-{
- struct buf_cache_t *bp;
-
- mutex_lock(&b_mutex);
-
- bp = buf_cache_find(sb, sec);
- if (likely(bp))
- sector_write(sb, sec, bp->buf_bh, 0);
-
- WARN(!bp, "[EXFAT] failed to find buffer_cache(sector:%llu).\n",
- (unsigned long long)sec);
-
- mutex_unlock(&b_mutex);
-}
-
-void exfat_buf_lock(struct super_block *sb, sector_t sec)
-{
- struct buf_cache_t *bp;
-
- mutex_lock(&b_mutex);
-
- bp = buf_cache_find(sb, sec);
- if (likely(bp))
- bp->flag |= LOCKBIT;
-
- WARN(!bp, "[EXFAT] failed to find buffer_cache(sector:%llu).\n",
- (unsigned long long)sec);
-
- mutex_unlock(&b_mutex);
-}
-
-void exfat_buf_unlock(struct super_block *sb, sector_t sec)
-{
- struct buf_cache_t *bp;
-
- mutex_lock(&b_mutex);
-
- bp = buf_cache_find(sb, sec);
- if (likely(bp))
- bp->flag &= ~(LOCKBIT);
-
- WARN(!bp, "[EXFAT] failed to find buffer_cache(sector:%llu).\n",
- (unsigned long long)sec);
-
- mutex_unlock(&b_mutex);
-}
-
-void exfat_buf_release(struct super_block *sb, sector_t sec)
-{
- struct buf_cache_t *bp;
- struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
-
- mutex_lock(&b_mutex);
-
- bp = buf_cache_find(sb, sec);
- if (likely(bp)) {
- 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);
- }
-
- mutex_unlock(&b_mutex);
-}
-
-void exfat_buf_release_all(struct super_block *sb)
-{
- struct buf_cache_t *bp;
- struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
-
- mutex_lock(&b_mutex);
-
- 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;
- }
-
- mutex_unlock(&b_mutex);
-}
-
-void exfat_buf_sync(struct super_block *sb)
-{
- struct buf_cache_t *bp;
- struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
-
- mutex_lock(&b_mutex);
-
- 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;
- }
-
- mutex_unlock(&b_mutex);
-}
generated by cgit (git 2.34.1) at 2024-05-30 17:49:03 +0000