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![Hyeongseok Kim](/assets/img/avatar_default.png)
There are stressful update of cluster allocation bitmap when using dirsync mount option which is doing sync buffer on every cluster bit clearing. This could result in performance degradation when deleting big size file. Fix to update only when the bitmap buffer index is changed would make less disk access, improving performance especially for truncate operation. Testing with Samsung 256GB sdcard, mounted with dirsync option (mount -t exfat /dev/block/mmcblk0p1 /temp/mount -o dirsync) Remove 4GB file, blktrace result. [Before] : 39 secs. Total (blktrace): Reads Queued: 0, 0KiB Writes Queued: 32775, 16387KiB Read Dispatches: 0, 0KiB Write Dispatches: 32775, 16387KiB Reads Requeued: 0 Writes Requeued: 0 Reads Completed: 0, 0KiB Writes Completed: 32775, 16387KiB Read Merges: 0, 0KiB Write Merges: 0, 0KiB IO unplugs: 2 Timer unplugs: 0 [After] : 1 sec. Total (blktrace): Reads Queued: 0, 0KiB Writes Queued: 13, 6KiB Read Dispatches: 0, 0KiB Write Dispatches: 13, 6KiB Reads Requeued: 0 Writes Requeued: 0 Reads Completed: 0, 0KiB Writes Completed: 13, 6KiB Read Merges: 0, 0KiB Write Merges: 0, 0KiB IO unplugs: 1 Timer unplugs: 0 Signed-off-by: Hyeongseok Kim <hyeongseok@gmail.com> Acked-by: Sungjong Seo <sj1557.seo@samsung.com> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
275 lines
7.9 KiB
C
275 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
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*/
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#include <linux/blkdev.h>
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#include <linux/slab.h>
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#include <linux/buffer_head.h>
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#include "exfat_raw.h"
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#include "exfat_fs.h"
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static const unsigned char free_bit[] = {
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0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2,/* 0 ~ 19*/
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0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3,/* 20 ~ 39*/
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0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2,/* 40 ~ 59*/
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0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4,/* 60 ~ 79*/
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0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2,/* 80 ~ 99*/
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0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3,/*100 ~ 119*/
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0, 1, 0, 2, 0, 1, 0, 7, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2,/*120 ~ 139*/
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0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5,/*140 ~ 159*/
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0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2,/*160 ~ 179*/
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0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3,/*180 ~ 199*/
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0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2,/*200 ~ 219*/
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0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4,/*220 ~ 239*/
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0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0 /*240 ~ 254*/
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};
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static const unsigned char used_bit[] = {
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0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3,/* 0 ~ 19*/
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2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2, 3, 3, 4,/* 20 ~ 39*/
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2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5,/* 40 ~ 59*/
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4, 5, 5, 6, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,/* 60 ~ 79*/
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4,/* 80 ~ 99*/
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3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6,/*100 ~ 119*/
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4, 5, 5, 6, 5, 6, 6, 7, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4,/*120 ~ 139*/
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3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,/*140 ~ 159*/
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5,/*160 ~ 179*/
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4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 2, 3, 3, 4, 3, 4, 4, 5,/*180 ~ 199*/
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3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6,/*200 ~ 219*/
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5, 6, 6, 7, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,/*220 ~ 239*/
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4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8 /*240 ~ 255*/
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};
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/*
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* Allocation Bitmap Management Functions
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*/
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static int exfat_allocate_bitmap(struct super_block *sb,
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struct exfat_dentry *ep)
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{
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struct exfat_sb_info *sbi = EXFAT_SB(sb);
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long long map_size;
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unsigned int i, need_map_size;
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sector_t sector;
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sbi->map_clu = le32_to_cpu(ep->dentry.bitmap.start_clu);
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map_size = le64_to_cpu(ep->dentry.bitmap.size);
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need_map_size = ((EXFAT_DATA_CLUSTER_COUNT(sbi) - 1) / BITS_PER_BYTE)
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+ 1;
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if (need_map_size != map_size) {
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exfat_err(sb, "bogus allocation bitmap size(need : %u, cur : %lld)",
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need_map_size, map_size);
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/*
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* Only allowed when bogus allocation
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* bitmap size is large
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*/
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if (need_map_size > map_size)
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return -EIO;
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}
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sbi->map_sectors = ((need_map_size - 1) >>
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(sb->s_blocksize_bits)) + 1;
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sbi->vol_amap = kmalloc_array(sbi->map_sectors,
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sizeof(struct buffer_head *), GFP_KERNEL);
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if (!sbi->vol_amap)
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return -ENOMEM;
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sector = exfat_cluster_to_sector(sbi, sbi->map_clu);
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for (i = 0; i < sbi->map_sectors; i++) {
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sbi->vol_amap[i] = sb_bread(sb, sector + i);
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if (!sbi->vol_amap[i]) {
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/* release all buffers and free vol_amap */
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int j = 0;
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while (j < i)
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brelse(sbi->vol_amap[j++]);
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kfree(sbi->vol_amap);
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sbi->vol_amap = NULL;
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return -EIO;
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}
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}
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return 0;
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}
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int exfat_load_bitmap(struct super_block *sb)
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{
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unsigned int i, type;
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struct exfat_chain clu;
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struct exfat_sb_info *sbi = EXFAT_SB(sb);
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exfat_chain_set(&clu, sbi->root_dir, 0, ALLOC_FAT_CHAIN);
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while (clu.dir != EXFAT_EOF_CLUSTER) {
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for (i = 0; i < sbi->dentries_per_clu; i++) {
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struct exfat_dentry *ep;
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struct buffer_head *bh;
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ep = exfat_get_dentry(sb, &clu, i, &bh, NULL);
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if (!ep)
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return -EIO;
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type = exfat_get_entry_type(ep);
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if (type == TYPE_UNUSED)
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break;
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if (type != TYPE_BITMAP)
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continue;
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if (ep->dentry.bitmap.flags == 0x0) {
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int err;
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err = exfat_allocate_bitmap(sb, ep);
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brelse(bh);
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return err;
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}
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brelse(bh);
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}
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if (exfat_get_next_cluster(sb, &clu.dir))
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return -EIO;
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}
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return -EINVAL;
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}
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void exfat_free_bitmap(struct exfat_sb_info *sbi)
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{
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int i;
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for (i = 0; i < sbi->map_sectors; i++)
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__brelse(sbi->vol_amap[i]);
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kfree(sbi->vol_amap);
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}
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/*
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* If the value of "clu" is 0, it means cluster 2 which is the first cluster of
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* the cluster heap.
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*/
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int exfat_set_bitmap(struct inode *inode, unsigned int clu)
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{
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int i, b;
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unsigned int ent_idx;
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struct super_block *sb = inode->i_sb;
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struct exfat_sb_info *sbi = EXFAT_SB(sb);
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WARN_ON(clu < EXFAT_FIRST_CLUSTER);
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ent_idx = CLUSTER_TO_BITMAP_ENT(clu);
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i = BITMAP_OFFSET_SECTOR_INDEX(sb, ent_idx);
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b = BITMAP_OFFSET_BIT_IN_SECTOR(sb, ent_idx);
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set_bit_le(b, sbi->vol_amap[i]->b_data);
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exfat_update_bh(sbi->vol_amap[i], IS_DIRSYNC(inode));
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return 0;
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}
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/*
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* If the value of "clu" is 0, it means cluster 2 which is the first cluster of
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* the cluster heap.
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*/
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void exfat_clear_bitmap(struct inode *inode, unsigned int clu, bool sync)
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{
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int i, b;
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unsigned int ent_idx;
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struct super_block *sb = inode->i_sb;
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struct exfat_sb_info *sbi = EXFAT_SB(sb);
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struct exfat_mount_options *opts = &sbi->options;
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WARN_ON(clu < EXFAT_FIRST_CLUSTER);
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ent_idx = CLUSTER_TO_BITMAP_ENT(clu);
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i = BITMAP_OFFSET_SECTOR_INDEX(sb, ent_idx);
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b = BITMAP_OFFSET_BIT_IN_SECTOR(sb, ent_idx);
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clear_bit_le(b, sbi->vol_amap[i]->b_data);
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exfat_update_bh(sbi->vol_amap[i], sync);
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if (opts->discard) {
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int ret_discard;
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ret_discard = sb_issue_discard(sb,
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exfat_cluster_to_sector(sbi, clu +
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EXFAT_RESERVED_CLUSTERS),
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(1 << sbi->sect_per_clus_bits), GFP_NOFS, 0);
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if (ret_discard == -EOPNOTSUPP) {
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exfat_err(sb, "discard not supported by device, disabling");
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opts->discard = 0;
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}
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}
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}
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/*
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* If the value of "clu" is 0, it means cluster 2 which is the first cluster of
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* the cluster heap.
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*/
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unsigned int exfat_find_free_bitmap(struct super_block *sb, unsigned int clu)
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{
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unsigned int i, map_i, map_b, ent_idx;
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unsigned int clu_base, clu_free;
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unsigned char k, clu_mask;
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struct exfat_sb_info *sbi = EXFAT_SB(sb);
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WARN_ON(clu < EXFAT_FIRST_CLUSTER);
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ent_idx = CLUSTER_TO_BITMAP_ENT(clu);
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clu_base = BITMAP_ENT_TO_CLUSTER(ent_idx & ~(BITS_PER_BYTE_MASK));
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clu_mask = IGNORED_BITS_REMAINED(clu, clu_base);
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map_i = BITMAP_OFFSET_SECTOR_INDEX(sb, ent_idx);
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map_b = BITMAP_OFFSET_BYTE_IN_SECTOR(sb, ent_idx);
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for (i = EXFAT_FIRST_CLUSTER; i < sbi->num_clusters;
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i += BITS_PER_BYTE) {
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k = *(sbi->vol_amap[map_i]->b_data + map_b);
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if (clu_mask > 0) {
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k |= clu_mask;
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clu_mask = 0;
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}
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if (k < 0xFF) {
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clu_free = clu_base + free_bit[k];
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if (clu_free < sbi->num_clusters)
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return clu_free;
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}
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clu_base += BITS_PER_BYTE;
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if (++map_b >= sb->s_blocksize ||
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clu_base >= sbi->num_clusters) {
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if (++map_i >= sbi->map_sectors) {
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clu_base = EXFAT_FIRST_CLUSTER;
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map_i = 0;
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}
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map_b = 0;
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}
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}
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return EXFAT_EOF_CLUSTER;
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}
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int exfat_count_used_clusters(struct super_block *sb, unsigned int *ret_count)
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{
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struct exfat_sb_info *sbi = EXFAT_SB(sb);
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unsigned int count = 0;
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unsigned int i, map_i = 0, map_b = 0;
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unsigned int total_clus = EXFAT_DATA_CLUSTER_COUNT(sbi);
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unsigned int last_mask = total_clus & BITS_PER_BYTE_MASK;
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unsigned char clu_bits;
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const unsigned char last_bit_mask[] = {0, 0b00000001, 0b00000011,
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0b00000111, 0b00001111, 0b00011111, 0b00111111, 0b01111111};
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total_clus &= ~last_mask;
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for (i = 0; i < total_clus; i += BITS_PER_BYTE) {
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clu_bits = *(sbi->vol_amap[map_i]->b_data + map_b);
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count += used_bit[clu_bits];
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if (++map_b >= (unsigned int)sb->s_blocksize) {
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map_i++;
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map_b = 0;
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}
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}
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if (last_mask) {
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clu_bits = *(sbi->vol_amap[map_i]->b_data + map_b);
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clu_bits &= last_bit_mask[last_mask];
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count += used_bit[clu_bits];
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}
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*ret_count = count;
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return 0;
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}
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