2020-02-03 07:47:19 -05:00
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// 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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2020-02-03 19:18:10 -05:00
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#include <linux/version.h>
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2020-02-03 07:47:19 -05:00
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#include <linux/slab.h>
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2021-03-03 18:59:45 -05:00
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#include <linux/compat.h>
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2020-02-03 07:47:19 -05:00
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#include <linux/bio.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 int exfat_extract_uni_name(struct exfat_dentry *ep,
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unsigned short *uniname)
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{
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int i, len = 0;
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for (i = 0; i < EXFAT_FILE_NAME_LEN; i++) {
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*uniname = le16_to_cpu(ep->dentry.name.unicode_0_14[i]);
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if (*uniname == 0x0)
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return len;
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uniname++;
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len++;
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}
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*uniname = 0x0;
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return len;
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}
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static void exfat_get_uniname_from_ext_entry(struct super_block *sb,
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struct exfat_chain *p_dir, int entry, unsigned short *uniname)
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{
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int i;
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2022-11-25 22:25:14 -05:00
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struct exfat_entry_set_cache es;
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2020-02-03 07:47:19 -05:00
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2022-11-25 22:25:14 -05:00
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if (exfat_get_dentry_set(&es, sb, p_dir, entry, ES_ALL_ENTRIES))
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2020-02-03 07:47:19 -05:00
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return;
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/*
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* First entry : file entry
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* Second entry : stream-extension entry
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* Third entry : first file-name entry
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* So, the index of first file-name dentry should start from 2.
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*/
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2022-11-25 22:25:14 -05:00
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for (i = 2; i < es.num_entries; i++) {
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struct exfat_dentry *ep = exfat_get_dentry_cached(&es, i);
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2020-05-31 08:00:20 -04:00
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2020-02-03 07:47:19 -05:00
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/* end of name entry */
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if (exfat_get_entry_type(ep) != TYPE_EXTEND)
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2020-05-31 08:00:20 -04:00
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break;
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2020-02-03 07:47:19 -05:00
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exfat_extract_uni_name(ep, uniname);
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uniname += EXFAT_FILE_NAME_LEN;
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}
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2022-11-25 22:27:59 -05:00
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exfat_put_dentry_set(&es, false);
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2020-02-03 07:47:19 -05:00
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}
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/* read a directory entry from the opened directory */
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2020-09-24 19:50:00 -04:00
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static int exfat_readdir(struct inode *inode, loff_t *cpos, struct exfat_dir_entry *dir_entry)
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2020-02-03 07:47:19 -05:00
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{
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2020-09-24 19:50:00 -04:00
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int i, dentries_per_clu, dentries_per_clu_bits = 0, num_ext;
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2021-06-08 22:46:30 -04:00
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unsigned int type, clu_offset, max_dentries;
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2020-02-03 07:47:19 -05:00
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struct exfat_chain dir, clu;
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struct exfat_uni_name uni_name;
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struct exfat_dentry *ep;
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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_inode_info *ei = EXFAT_I(inode);
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2020-09-24 19:50:00 -04:00
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unsigned int dentry = EXFAT_B_TO_DEN(*cpos) & 0xFFFFFFFF;
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2020-02-03 07:47:19 -05:00
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struct buffer_head *bh;
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/* check if the given file ID is opened */
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if (ei->type != TYPE_DIR)
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return -EPERM;
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if (ei->entry == -1)
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exfat_chain_set(&dir, sbi->root_dir, 0, ALLOC_FAT_CHAIN);
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else
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exfat_chain_set(&dir, ei->start_clu,
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EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags);
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dentries_per_clu = sbi->dentries_per_clu;
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dentries_per_clu_bits = ilog2(dentries_per_clu);
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2021-06-08 22:46:30 -04:00
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max_dentries = (unsigned int)min_t(u64, MAX_EXFAT_DENTRIES,
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(u64)sbi->num_clusters << dentries_per_clu_bits);
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2020-02-03 07:47:19 -05:00
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clu_offset = dentry >> dentries_per_clu_bits;
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exfat_chain_dup(&clu, &dir);
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if (clu.flags == ALLOC_NO_FAT_CHAIN) {
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clu.dir += clu_offset;
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clu.size -= clu_offset;
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} else {
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/* hint_information */
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if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER &&
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ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) {
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clu_offset -= ei->hint_bmap.off;
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clu.dir = ei->hint_bmap.clu;
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}
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while (clu_offset > 0) {
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if (exfat_get_next_cluster(sb, &(clu.dir)))
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return -EIO;
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clu_offset--;
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}
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}
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2021-06-08 22:46:30 -04:00
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while (clu.dir != EXFAT_EOF_CLUSTER && dentry < max_dentries) {
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2020-02-03 07:47:19 -05:00
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i = dentry & (dentries_per_clu - 1);
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for ( ; i < dentries_per_clu; i++, dentry++) {
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2021-12-16 07:29:58 -05:00
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ep = exfat_get_dentry(sb, &clu, i, &bh);
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2020-02-03 07:47:19 -05:00
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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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brelse(bh);
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break;
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}
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if (type != TYPE_FILE && type != TYPE_DIR) {
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brelse(bh);
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continue;
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}
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2020-09-24 19:50:00 -04:00
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num_ext = ep->dentry.file.num_ext;
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2020-02-03 07:47:19 -05:00
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dir_entry->attr = le16_to_cpu(ep->dentry.file.attr);
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exfat_get_entry_time(sbi, &dir_entry->crtime,
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ep->dentry.file.create_tz,
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ep->dentry.file.create_time,
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ep->dentry.file.create_date,
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2020-05-03 10:10:31 -04:00
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ep->dentry.file.create_time_cs);
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2020-02-03 07:47:19 -05:00
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exfat_get_entry_time(sbi, &dir_entry->mtime,
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ep->dentry.file.modify_tz,
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ep->dentry.file.modify_time,
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ep->dentry.file.modify_date,
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2020-05-03 10:10:31 -04:00
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ep->dentry.file.modify_time_cs);
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2020-02-03 07:47:19 -05:00
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exfat_get_entry_time(sbi, &dir_entry->atime,
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ep->dentry.file.access_tz,
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ep->dentry.file.access_time,
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ep->dentry.file.access_date,
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0);
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*uni_name.name = 0x0;
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2021-03-23 23:14:06 -04:00
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exfat_get_uniname_from_ext_entry(sb, &clu, i,
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2020-02-03 07:47:19 -05:00
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uni_name.name);
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exfat_utf16_to_nls(sb, &uni_name,
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dir_entry->namebuf.lfn,
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dir_entry->namebuf.lfnbuf_len);
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brelse(bh);
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2021-12-16 07:29:58 -05:00
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ep = exfat_get_dentry(sb, &clu, i + 1, &bh);
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2020-02-03 07:47:19 -05:00
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if (!ep)
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return -EIO;
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dir_entry->size =
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le64_to_cpu(ep->dentry.stream.valid_size);
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2020-09-24 19:50:00 -04:00
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dir_entry->entry = dentry;
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2020-02-03 07:47:19 -05:00
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brelse(bh);
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ei->hint_bmap.off = dentry >> dentries_per_clu_bits;
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ei->hint_bmap.clu = clu.dir;
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2020-09-24 19:50:00 -04:00
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*cpos = EXFAT_DEN_TO_B(dentry + 1 + num_ext);
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2020-02-03 07:47:19 -05:00
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return 0;
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}
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if (clu.flags == ALLOC_NO_FAT_CHAIN) {
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if (--clu.size > 0)
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clu.dir++;
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else
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clu.dir = EXFAT_EOF_CLUSTER;
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} else {
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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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}
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dir_entry->namebuf.lfn[0] = '\0';
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2020-09-24 19:50:00 -04:00
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*cpos = EXFAT_DEN_TO_B(dentry);
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2020-02-03 07:47:19 -05:00
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return 0;
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}
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static void exfat_init_namebuf(struct exfat_dentry_namebuf *nb)
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{
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nb->lfn = NULL;
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nb->lfnbuf_len = 0;
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}
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static int exfat_alloc_namebuf(struct exfat_dentry_namebuf *nb)
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{
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nb->lfn = __getname();
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if (!nb->lfn)
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return -ENOMEM;
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nb->lfnbuf_len = MAX_VFSNAME_BUF_SIZE;
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return 0;
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}
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static void exfat_free_namebuf(struct exfat_dentry_namebuf *nb)
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{
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if (!nb->lfn)
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return;
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__putname(nb->lfn);
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exfat_init_namebuf(nb);
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}
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/* skip iterating emit_dots when dir is empty */
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#define ITER_POS_FILLED_DOTS (2)
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static int exfat_iterate(struct file *filp, struct dir_context *ctx)
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{
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struct inode *inode = filp->f_path.dentry->d_inode;
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struct super_block *sb = inode->i_sb;
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struct inode *tmp;
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struct exfat_dir_entry de;
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struct exfat_dentry_namebuf *nb = &(de.namebuf);
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struct exfat_inode_info *ei = EXFAT_I(inode);
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unsigned long inum;
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loff_t cpos, i_pos;
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int err = 0, fake_offset = 0;
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exfat_init_namebuf(nb);
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mutex_lock(&EXFAT_SB(sb)->s_lock);
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cpos = ctx->pos;
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if (!dir_emit_dots(filp, ctx))
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goto unlock;
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if (ctx->pos == ITER_POS_FILLED_DOTS) {
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cpos = 0;
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fake_offset = 1;
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}
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if (cpos & (DENTRY_SIZE - 1)) {
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err = -ENOENT;
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goto unlock;
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}
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/* name buffer should be allocated before use */
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err = exfat_alloc_namebuf(nb);
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if (err)
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goto unlock;
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get_new:
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2021-06-08 22:46:30 -04:00
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if (ei->flags == ALLOC_NO_FAT_CHAIN && cpos >= i_size_read(inode))
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2020-02-03 07:47:19 -05:00
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goto end_of_dir;
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2020-09-24 19:50:00 -04:00
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err = exfat_readdir(inode, &cpos, &de);
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2020-02-03 07:47:19 -05:00
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if (err) {
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/*
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* At least we tried to read a sector. Move cpos to next sector
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* position (should be aligned).
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*/
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if (err == -EIO) {
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cpos += 1 << (sb->s_blocksize_bits);
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cpos &= ~(sb->s_blocksize - 1);
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}
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err = -EIO;
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goto end_of_dir;
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}
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if (!nb->lfn[0])
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goto end_of_dir;
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2020-09-24 19:50:00 -04:00
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i_pos = ((loff_t)ei->start_clu << 32) | (de.entry & 0xffffffff);
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2020-02-03 07:47:19 -05:00
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tmp = exfat_iget(sb, i_pos);
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if (tmp) {
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inum = tmp->i_ino;
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iput(tmp);
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} else {
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inum = iunique(sb, EXFAT_ROOT_INO);
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}
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/*
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* Before calling dir_emit(), sb_lock should be released.
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* Because page fault can occur in dir_emit() when the size
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* of buffer given from user is larger than one page size.
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*/
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mutex_unlock(&EXFAT_SB(sb)->s_lock);
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if (!dir_emit(ctx, nb->lfn, strlen(nb->lfn), inum,
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(de.attr & ATTR_SUBDIR) ? DT_DIR : DT_REG))
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goto out_unlocked;
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mutex_lock(&EXFAT_SB(sb)->s_lock);
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ctx->pos = cpos;
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goto get_new;
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end_of_dir:
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if (!cpos && fake_offset)
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cpos = ITER_POS_FILLED_DOTS;
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ctx->pos = cpos;
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unlock:
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mutex_unlock(&EXFAT_SB(sb)->s_lock);
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out_unlocked:
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/*
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* To improve performance, free namebuf after unlock sb_lock.
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* If namebuf is not allocated, this function do nothing
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*/
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exfat_free_namebuf(nb);
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return err;
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}
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const struct file_operations exfat_dir_operations = {
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.llseek = generic_file_llseek,
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.read = generic_read_dir,
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.iterate = exfat_iterate,
|
2021-03-03 18:59:45 -05:00
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.unlocked_ioctl = exfat_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = exfat_compat_ioctl,
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#endif
|
2020-06-18 02:16:40 -04:00
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.fsync = exfat_file_fsync,
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2020-02-03 07:47:19 -05:00
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};
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int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu)
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{
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int ret;
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exfat_chain_set(clu, EXFAT_EOF_CLUSTER, 0, ALLOC_NO_FAT_CHAIN);
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2021-03-18 02:23:56 -04:00
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|
|
ret = exfat_alloc_cluster(inode, 1, clu, IS_DIRSYNC(inode));
|
2020-02-03 07:47:19 -05:00
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
return exfat_zeroed_cluster(inode, clu->dir);
|
|
|
|
}
|
|
|
|
|
|
|
|
int exfat_calc_num_entries(struct exfat_uni_name *p_uniname)
|
|
|
|
{
|
|
|
|
int len;
|
|
|
|
|
|
|
|
len = p_uniname->name_len;
|
|
|
|
if (len == 0)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
/* 1 file entry + 1 stream entry + name entries */
|
|
|
|
return ((len - 1) / EXFAT_FILE_NAME_LEN + 3);
|
|
|
|
}
|
|
|
|
|
|
|
|
unsigned int exfat_get_entry_type(struct exfat_dentry *ep)
|
|
|
|
{
|
|
|
|
if (ep->type == EXFAT_UNUSED)
|
|
|
|
return TYPE_UNUSED;
|
|
|
|
if (IS_EXFAT_DELETED(ep->type))
|
|
|
|
return TYPE_DELETED;
|
|
|
|
if (ep->type == EXFAT_INVAL)
|
|
|
|
return TYPE_INVALID;
|
|
|
|
if (IS_EXFAT_CRITICAL_PRI(ep->type)) {
|
|
|
|
if (ep->type == EXFAT_BITMAP)
|
|
|
|
return TYPE_BITMAP;
|
|
|
|
if (ep->type == EXFAT_UPCASE)
|
|
|
|
return TYPE_UPCASE;
|
|
|
|
if (ep->type == EXFAT_VOLUME)
|
|
|
|
return TYPE_VOLUME;
|
|
|
|
if (ep->type == EXFAT_FILE) {
|
|
|
|
if (le16_to_cpu(ep->dentry.file.attr) & ATTR_SUBDIR)
|
|
|
|
return TYPE_DIR;
|
|
|
|
return TYPE_FILE;
|
|
|
|
}
|
|
|
|
return TYPE_CRITICAL_PRI;
|
|
|
|
}
|
|
|
|
if (IS_EXFAT_BENIGN_PRI(ep->type)) {
|
|
|
|
if (ep->type == EXFAT_GUID)
|
|
|
|
return TYPE_GUID;
|
|
|
|
if (ep->type == EXFAT_PADDING)
|
|
|
|
return TYPE_PADDING;
|
|
|
|
if (ep->type == EXFAT_ACLTAB)
|
|
|
|
return TYPE_ACLTAB;
|
|
|
|
return TYPE_BENIGN_PRI;
|
|
|
|
}
|
|
|
|
if (IS_EXFAT_CRITICAL_SEC(ep->type)) {
|
|
|
|
if (ep->type == EXFAT_STREAM)
|
|
|
|
return TYPE_STREAM;
|
|
|
|
if (ep->type == EXFAT_NAME)
|
|
|
|
return TYPE_EXTEND;
|
|
|
|
if (ep->type == EXFAT_ACL)
|
|
|
|
return TYPE_ACL;
|
|
|
|
return TYPE_CRITICAL_SEC;
|
|
|
|
}
|
|
|
|
return TYPE_BENIGN_SEC;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void exfat_set_entry_type(struct exfat_dentry *ep, unsigned int type)
|
|
|
|
{
|
|
|
|
if (type == TYPE_UNUSED) {
|
|
|
|
ep->type = EXFAT_UNUSED;
|
|
|
|
} else if (type == TYPE_DELETED) {
|
|
|
|
ep->type &= EXFAT_DELETE;
|
|
|
|
} else if (type == TYPE_STREAM) {
|
|
|
|
ep->type = EXFAT_STREAM;
|
|
|
|
} else if (type == TYPE_EXTEND) {
|
|
|
|
ep->type = EXFAT_NAME;
|
|
|
|
} else if (type == TYPE_BITMAP) {
|
|
|
|
ep->type = EXFAT_BITMAP;
|
|
|
|
} else if (type == TYPE_UPCASE) {
|
|
|
|
ep->type = EXFAT_UPCASE;
|
|
|
|
} else if (type == TYPE_VOLUME) {
|
|
|
|
ep->type = EXFAT_VOLUME;
|
|
|
|
} else if (type == TYPE_DIR) {
|
|
|
|
ep->type = EXFAT_FILE;
|
|
|
|
ep->dentry.file.attr = cpu_to_le16(ATTR_SUBDIR);
|
|
|
|
} else if (type == TYPE_FILE) {
|
|
|
|
ep->type = EXFAT_FILE;
|
|
|
|
ep->dentry.file.attr = cpu_to_le16(ATTR_ARCHIVE);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void exfat_init_stream_entry(struct exfat_dentry *ep,
|
|
|
|
unsigned char flags, unsigned int start_clu,
|
|
|
|
unsigned long long size)
|
|
|
|
{
|
|
|
|
exfat_set_entry_type(ep, TYPE_STREAM);
|
|
|
|
ep->dentry.stream.flags = flags;
|
|
|
|
ep->dentry.stream.start_clu = cpu_to_le32(start_clu);
|
|
|
|
ep->dentry.stream.valid_size = cpu_to_le64(size);
|
|
|
|
ep->dentry.stream.size = cpu_to_le64(size);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void exfat_init_name_entry(struct exfat_dentry *ep,
|
|
|
|
unsigned short *uniname)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
exfat_set_entry_type(ep, TYPE_EXTEND);
|
|
|
|
ep->dentry.name.flags = 0x0;
|
|
|
|
|
|
|
|
for (i = 0; i < EXFAT_FILE_NAME_LEN; i++) {
|
2020-06-09 19:23:26 -04:00
|
|
|
if (*uniname != 0x0) {
|
|
|
|
ep->dentry.name.unicode_0_14[i] = cpu_to_le16(*uniname);
|
|
|
|
uniname++;
|
|
|
|
} else {
|
|
|
|
ep->dentry.name.unicode_0_14[i] = 0x0;
|
|
|
|
}
|
2020-02-03 07:47:19 -05:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir,
|
|
|
|
int entry, unsigned int type, unsigned int start_clu,
|
|
|
|
unsigned long long size)
|
|
|
|
{
|
|
|
|
struct super_block *sb = inode->i_sb;
|
|
|
|
struct exfat_sb_info *sbi = EXFAT_SB(sb);
|
2020-07-01 03:43:16 -04:00
|
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 19, 0)
|
|
|
|
struct timespec64 ts;
|
2020-02-03 19:18:10 -05:00
|
|
|
#else
|
2020-07-01 03:43:16 -04:00
|
|
|
struct timespec ts;
|
2020-02-03 19:18:10 -05:00
|
|
|
#endif
|
2020-02-03 07:47:19 -05:00
|
|
|
struct exfat_dentry *ep;
|
|
|
|
struct buffer_head *bh;
|
|
|
|
|
2020-07-01 03:43:16 -04:00
|
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 10, 0)
|
|
|
|
ts = current_time(inode);
|
|
|
|
#else
|
|
|
|
ts = CURRENT_TIME_SEC;
|
|
|
|
#endif
|
|
|
|
|
2020-02-03 07:47:19 -05:00
|
|
|
/*
|
|
|
|
* We cannot use exfat_get_dentry_set here because file ep is not
|
|
|
|
* initialized yet.
|
|
|
|
*/
|
2021-12-16 07:29:58 -05:00
|
|
|
ep = exfat_get_dentry(sb, p_dir, entry, &bh);
|
2020-02-03 07:47:19 -05:00
|
|
|
if (!ep)
|
|
|
|
return -EIO;
|
|
|
|
|
|
|
|
exfat_set_entry_type(ep, type);
|
|
|
|
exfat_set_entry_time(sbi, &ts,
|
|
|
|
&ep->dentry.file.create_tz,
|
|
|
|
&ep->dentry.file.create_time,
|
|
|
|
&ep->dentry.file.create_date,
|
2020-05-03 10:10:31 -04:00
|
|
|
&ep->dentry.file.create_time_cs);
|
2020-02-03 07:47:19 -05:00
|
|
|
exfat_set_entry_time(sbi, &ts,
|
|
|
|
&ep->dentry.file.modify_tz,
|
|
|
|
&ep->dentry.file.modify_time,
|
|
|
|
&ep->dentry.file.modify_date,
|
2020-05-03 10:10:31 -04:00
|
|
|
&ep->dentry.file.modify_time_cs);
|
2020-02-03 07:47:19 -05:00
|
|
|
exfat_set_entry_time(sbi, &ts,
|
|
|
|
&ep->dentry.file.access_tz,
|
|
|
|
&ep->dentry.file.access_time,
|
|
|
|
&ep->dentry.file.access_date,
|
|
|
|
NULL);
|
|
|
|
|
2020-06-16 01:25:07 -04:00
|
|
|
exfat_update_bh(bh, IS_DIRSYNC(inode));
|
2020-02-03 07:47:19 -05:00
|
|
|
brelse(bh);
|
|
|
|
|
2021-12-16 07:29:58 -05:00
|
|
|
ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh);
|
2020-02-03 07:47:19 -05:00
|
|
|
if (!ep)
|
|
|
|
return -EIO;
|
|
|
|
|
|
|
|
exfat_init_stream_entry(ep,
|
|
|
|
(type == TYPE_FILE) ? ALLOC_FAT_CHAIN : ALLOC_NO_FAT_CHAIN,
|
|
|
|
start_clu, size);
|
2020-06-16 01:25:07 -04:00
|
|
|
exfat_update_bh(bh, IS_DIRSYNC(inode));
|
2020-02-03 07:47:19 -05:00
|
|
|
brelse(bh);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int exfat_update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir,
|
|
|
|
int entry)
|
|
|
|
{
|
|
|
|
struct super_block *sb = inode->i_sb;
|
|
|
|
int ret = 0;
|
|
|
|
int i, num_entries;
|
2020-05-31 08:04:00 -04:00
|
|
|
u16 chksum;
|
2020-02-03 07:47:19 -05:00
|
|
|
struct exfat_dentry *ep, *fep;
|
|
|
|
struct buffer_head *fbh, *bh;
|
|
|
|
|
2021-12-16 07:29:58 -05:00
|
|
|
fep = exfat_get_dentry(sb, p_dir, entry, &fbh);
|
2020-02-03 07:47:19 -05:00
|
|
|
if (!fep)
|
|
|
|
return -EIO;
|
|
|
|
|
|
|
|
num_entries = fep->dentry.file.num_ext + 1;
|
2020-05-31 08:04:00 -04:00
|
|
|
chksum = exfat_calc_chksum16(fep, DENTRY_SIZE, 0, CS_DIR_ENTRY);
|
2020-02-03 07:47:19 -05:00
|
|
|
|
|
|
|
for (i = 1; i < num_entries; i++) {
|
2021-12-16 07:29:58 -05:00
|
|
|
ep = exfat_get_dentry(sb, p_dir, entry + i, &bh);
|
2020-02-03 07:47:19 -05:00
|
|
|
if (!ep) {
|
|
|
|
ret = -EIO;
|
|
|
|
goto release_fbh;
|
|
|
|
}
|
2020-05-31 08:04:00 -04:00
|
|
|
chksum = exfat_calc_chksum16(ep, DENTRY_SIZE, chksum,
|
2020-02-03 07:47:19 -05:00
|
|
|
CS_DEFAULT);
|
|
|
|
brelse(bh);
|
|
|
|
}
|
|
|
|
|
|
|
|
fep->dentry.file.checksum = cpu_to_le16(chksum);
|
2020-06-16 01:25:07 -04:00
|
|
|
exfat_update_bh(fbh, IS_DIRSYNC(inode));
|
2020-02-03 07:47:19 -05:00
|
|
|
release_fbh:
|
|
|
|
brelse(fbh);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir,
|
|
|
|
int entry, int num_entries, struct exfat_uni_name *p_uniname)
|
|
|
|
{
|
|
|
|
struct super_block *sb = inode->i_sb;
|
|
|
|
int i;
|
|
|
|
unsigned short *uniname = p_uniname->name;
|
|
|
|
struct exfat_dentry *ep;
|
|
|
|
struct buffer_head *bh;
|
|
|
|
int sync = IS_DIRSYNC(inode);
|
|
|
|
|
2021-12-16 07:29:58 -05:00
|
|
|
ep = exfat_get_dentry(sb, p_dir, entry, &bh);
|
2020-02-03 07:47:19 -05:00
|
|
|
if (!ep)
|
|
|
|
return -EIO;
|
|
|
|
|
|
|
|
ep->dentry.file.num_ext = (unsigned char)(num_entries - 1);
|
2020-06-16 01:25:07 -04:00
|
|
|
exfat_update_bh(bh, sync);
|
2020-02-03 07:47:19 -05:00
|
|
|
brelse(bh);
|
|
|
|
|
2021-12-16 07:29:58 -05:00
|
|
|
ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh);
|
2020-02-03 07:47:19 -05:00
|
|
|
if (!ep)
|
|
|
|
return -EIO;
|
|
|
|
|
|
|
|
ep->dentry.stream.name_len = p_uniname->name_len;
|
|
|
|
ep->dentry.stream.name_hash = cpu_to_le16(p_uniname->name_hash);
|
2020-06-16 01:25:07 -04:00
|
|
|
exfat_update_bh(bh, sync);
|
2020-02-03 07:47:19 -05:00
|
|
|
brelse(bh);
|
|
|
|
|
|
|
|
for (i = EXFAT_FIRST_CLUSTER; i < num_entries; i++) {
|
2021-12-16 07:29:58 -05:00
|
|
|
ep = exfat_get_dentry(sb, p_dir, entry + i, &bh);
|
2020-02-03 07:47:19 -05:00
|
|
|
if (!ep)
|
|
|
|
return -EIO;
|
|
|
|
|
|
|
|
exfat_init_name_entry(ep, uniname);
|
2020-06-16 01:25:07 -04:00
|
|
|
exfat_update_bh(bh, sync);
|
2020-02-03 07:47:19 -05:00
|
|
|
brelse(bh);
|
|
|
|
uniname += EXFAT_FILE_NAME_LEN;
|
|
|
|
}
|
|
|
|
|
|
|
|
exfat_update_dir_chksum(inode, p_dir, entry);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir,
|
|
|
|
int entry, int order, int num_entries)
|
|
|
|
{
|
|
|
|
struct super_block *sb = inode->i_sb;
|
|
|
|
int i;
|
|
|
|
struct exfat_dentry *ep;
|
|
|
|
struct buffer_head *bh;
|
|
|
|
|
|
|
|
for (i = order; i < num_entries; i++) {
|
2021-12-16 07:29:58 -05:00
|
|
|
ep = exfat_get_dentry(sb, p_dir, entry + i, &bh);
|
2020-02-03 07:47:19 -05:00
|
|
|
if (!ep)
|
|
|
|
return -EIO;
|
|
|
|
|
|
|
|
exfat_set_entry_type(ep, TYPE_DELETED);
|
2020-06-16 01:25:07 -04:00
|
|
|
exfat_update_bh(bh, IS_DIRSYNC(inode));
|
2020-02-03 07:47:19 -05:00
|
|
|
brelse(bh);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2020-05-31 08:00:20 -04:00
|
|
|
void exfat_update_dir_chksum_with_entry_set(struct exfat_entry_set_cache *es)
|
2020-02-03 07:47:19 -05:00
|
|
|
{
|
2020-05-31 08:00:20 -04:00
|
|
|
int chksum_type = CS_DIR_ENTRY, i;
|
2020-02-03 07:47:19 -05:00
|
|
|
unsigned short chksum = 0;
|
2020-05-31 08:00:20 -04:00
|
|
|
struct exfat_dentry *ep;
|
2020-02-03 07:47:19 -05:00
|
|
|
|
2020-05-31 08:00:20 -04:00
|
|
|
for (i = 0; i < es->num_entries; i++) {
|
|
|
|
ep = exfat_get_dentry_cached(es, i);
|
2020-05-31 08:04:00 -04:00
|
|
|
chksum = exfat_calc_chksum16(ep, DENTRY_SIZE, chksum,
|
|
|
|
chksum_type);
|
2020-02-03 07:47:19 -05:00
|
|
|
chksum_type = CS_DEFAULT;
|
|
|
|
}
|
2020-05-31 08:00:20 -04:00
|
|
|
ep = exfat_get_dentry_cached(es, 0);
|
|
|
|
ep->dentry.file.checksum = cpu_to_le16(chksum);
|
|
|
|
es->modified = true;
|
|
|
|
}
|
2020-02-03 07:47:19 -05:00
|
|
|
|
2022-11-25 22:27:59 -05:00
|
|
|
int exfat_put_dentry_set(struct exfat_entry_set_cache *es, int sync)
|
2020-05-31 08:00:20 -04:00
|
|
|
{
|
2020-06-23 19:32:56 -04:00
|
|
|
int i, err = 0;
|
2020-02-03 07:47:19 -05:00
|
|
|
|
2020-06-23 19:32:56 -04:00
|
|
|
if (es->modified)
|
|
|
|
err = exfat_update_bhs(es->bh, es->num_bh, sync);
|
|
|
|
|
|
|
|
for (i = 0; i < es->num_bh; i++)
|
|
|
|
if (err)
|
|
|
|
bforget(es->bh[i]);
|
|
|
|
else
|
|
|
|
brelse(es->bh[i]);
|
2022-11-25 22:24:14 -05:00
|
|
|
|
|
|
|
if (IS_DYNAMIC_ES(es))
|
|
|
|
kfree(es->bh);
|
|
|
|
|
2020-06-23 20:41:34 -04:00
|
|
|
return err;
|
2020-02-03 07:47:19 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
static int exfat_walk_fat_chain(struct super_block *sb,
|
|
|
|
struct exfat_chain *p_dir, unsigned int byte_offset,
|
|
|
|
unsigned int *clu)
|
|
|
|
{
|
|
|
|
struct exfat_sb_info *sbi = EXFAT_SB(sb);
|
|
|
|
unsigned int clu_offset;
|
|
|
|
unsigned int cur_clu;
|
|
|
|
|
|
|
|
clu_offset = EXFAT_B_TO_CLU(byte_offset, sbi);
|
|
|
|
cur_clu = p_dir->dir;
|
|
|
|
|
|
|
|
if (p_dir->flags == ALLOC_NO_FAT_CHAIN) {
|
|
|
|
cur_clu += clu_offset;
|
|
|
|
} else {
|
|
|
|
while (clu_offset > 0) {
|
|
|
|
if (exfat_get_next_cluster(sb, &cur_clu))
|
|
|
|
return -EIO;
|
|
|
|
if (cur_clu == EXFAT_EOF_CLUSTER) {
|
|
|
|
exfat_fs_error(sb,
|
|
|
|
"invalid dentry access beyond EOF (clu : %u, eidx : %d)",
|
|
|
|
p_dir->dir,
|
|
|
|
EXFAT_B_TO_DEN(byte_offset));
|
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
clu_offset--;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
*clu = cur_clu;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2021-11-02 21:36:53 -04:00
|
|
|
static int exfat_find_location(struct super_block *sb, struct exfat_chain *p_dir,
|
|
|
|
int entry, sector_t *sector, int *offset)
|
2020-02-03 07:47:19 -05:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
unsigned int off, clu = 0;
|
|
|
|
struct exfat_sb_info *sbi = EXFAT_SB(sb);
|
|
|
|
|
|
|
|
off = EXFAT_DEN_TO_B(entry);
|
|
|
|
|
|
|
|
ret = exfat_walk_fat_chain(sb, p_dir, off, &clu);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
/* byte offset in cluster */
|
|
|
|
off = EXFAT_CLU_OFFSET(off, sbi);
|
|
|
|
|
|
|
|
/* byte offset in sector */
|
|
|
|
*offset = EXFAT_BLK_OFFSET(off, sb);
|
|
|
|
|
|
|
|
/* sector offset in cluster */
|
|
|
|
*sector = EXFAT_B_TO_BLK(off, sb);
|
|
|
|
*sector += exfat_cluster_to_sector(sbi, clu);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#define EXFAT_MAX_RA_SIZE (128*1024)
|
|
|
|
static int exfat_dir_readahead(struct super_block *sb, sector_t sec)
|
|
|
|
{
|
|
|
|
struct exfat_sb_info *sbi = EXFAT_SB(sb);
|
|
|
|
struct buffer_head *bh;
|
|
|
|
unsigned int max_ra_count = EXFAT_MAX_RA_SIZE >> sb->s_blocksize_bits;
|
|
|
|
unsigned int page_ra_count = PAGE_SIZE >> sb->s_blocksize_bits;
|
|
|
|
unsigned int adj_ra_count = max(sbi->sect_per_clus, page_ra_count);
|
|
|
|
unsigned int ra_count = min(adj_ra_count, max_ra_count);
|
|
|
|
|
|
|
|
/* Read-ahead is not required */
|
|
|
|
if (sbi->sect_per_clus == 1)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (sec < sbi->data_start_sector) {
|
2020-04-05 23:49:36 -04:00
|
|
|
exfat_err(sb, "requested sector is invalid(sect:%llu, root:%llu)",
|
|
|
|
(unsigned long long)sec, sbi->data_start_sector);
|
2020-02-03 07:47:19 -05:00
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Not sector aligned with ra_count, resize ra_count to page size */
|
|
|
|
if ((sec - sbi->data_start_sector) & (ra_count - 1))
|
|
|
|
ra_count = page_ra_count;
|
|
|
|
|
|
|
|
bh = sb_find_get_block(sb, sec);
|
|
|
|
if (!bh || !buffer_uptodate(bh)) {
|
|
|
|
unsigned int i;
|
|
|
|
|
|
|
|
for (i = 0; i < ra_count; i++)
|
|
|
|
sb_breadahead(sb, (sector_t)(sec + i));
|
|
|
|
}
|
|
|
|
brelse(bh);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
struct exfat_dentry *exfat_get_dentry(struct super_block *sb,
|
2021-12-16 07:29:58 -05:00
|
|
|
struct exfat_chain *p_dir, int entry, struct buffer_head **bh)
|
2020-02-03 07:47:19 -05:00
|
|
|
{
|
|
|
|
unsigned int dentries_per_page = EXFAT_B_TO_DEN(PAGE_SIZE);
|
|
|
|
int off;
|
|
|
|
sector_t sec;
|
|
|
|
|
|
|
|
if (p_dir->dir == DIR_DELETED) {
|
2020-04-05 23:49:36 -04:00
|
|
|
exfat_err(sb, "abnormal access to deleted dentry");
|
2020-02-03 07:47:19 -05:00
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (exfat_find_location(sb, p_dir, entry, &sec, &off))
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
if (p_dir->dir != EXFAT_FREE_CLUSTER &&
|
|
|
|
!(entry & (dentries_per_page - 1)))
|
|
|
|
exfat_dir_readahead(sb, sec);
|
|
|
|
|
|
|
|
*bh = sb_bread(sb, sec);
|
|
|
|
if (!*bh)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
return (struct exfat_dentry *)((*bh)->b_data + off);
|
|
|
|
}
|
|
|
|
|
|
|
|
enum exfat_validate_dentry_mode {
|
|
|
|
ES_MODE_STARTED,
|
|
|
|
ES_MODE_GET_FILE_ENTRY,
|
|
|
|
ES_MODE_GET_STRM_ENTRY,
|
|
|
|
ES_MODE_GET_NAME_ENTRY,
|
|
|
|
ES_MODE_GET_CRITICAL_SEC_ENTRY,
|
|
|
|
};
|
|
|
|
|
|
|
|
static bool exfat_validate_entry(unsigned int type,
|
|
|
|
enum exfat_validate_dentry_mode *mode)
|
|
|
|
{
|
|
|
|
if (type == TYPE_UNUSED || type == TYPE_DELETED)
|
|
|
|
return false;
|
|
|
|
|
|
|
|
switch (*mode) {
|
|
|
|
case ES_MODE_STARTED:
|
|
|
|
if (type != TYPE_FILE && type != TYPE_DIR)
|
|
|
|
return false;
|
|
|
|
*mode = ES_MODE_GET_FILE_ENTRY;
|
|
|
|
return true;
|
|
|
|
case ES_MODE_GET_FILE_ENTRY:
|
|
|
|
if (type != TYPE_STREAM)
|
|
|
|
return false;
|
|
|
|
*mode = ES_MODE_GET_STRM_ENTRY;
|
|
|
|
return true;
|
|
|
|
case ES_MODE_GET_STRM_ENTRY:
|
|
|
|
if (type != TYPE_EXTEND)
|
|
|
|
return false;
|
|
|
|
*mode = ES_MODE_GET_NAME_ENTRY;
|
|
|
|
return true;
|
|
|
|
case ES_MODE_GET_NAME_ENTRY:
|
|
|
|
if (type == TYPE_STREAM)
|
|
|
|
return false;
|
|
|
|
if (type != TYPE_EXTEND) {
|
|
|
|
if (!(type & TYPE_CRITICAL_SEC))
|
|
|
|
return false;
|
|
|
|
*mode = ES_MODE_GET_CRITICAL_SEC_ENTRY;
|
|
|
|
}
|
|
|
|
return true;
|
|
|
|
case ES_MODE_GET_CRITICAL_SEC_ENTRY:
|
|
|
|
if (type == TYPE_EXTEND || type == TYPE_STREAM)
|
|
|
|
return false;
|
|
|
|
if ((type & TYPE_CRITICAL_SEC) != TYPE_CRITICAL_SEC)
|
|
|
|
return false;
|
|
|
|
return true;
|
|
|
|
default:
|
|
|
|
WARN_ON_ONCE(1);
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2020-05-31 08:00:20 -04:00
|
|
|
struct exfat_dentry *exfat_get_dentry_cached(
|
|
|
|
struct exfat_entry_set_cache *es, int num)
|
|
|
|
{
|
|
|
|
int off = es->start_off + num * DENTRY_SIZE;
|
|
|
|
struct buffer_head *bh = es->bh[EXFAT_B_TO_BLK(off, es->sb)];
|
|
|
|
char *p = bh->b_data + EXFAT_BLK_OFFSET(off, es->sb);
|
|
|
|
|
|
|
|
return (struct exfat_dentry *)p;
|
|
|
|
}
|
|
|
|
|
2020-02-03 07:47:19 -05:00
|
|
|
/*
|
|
|
|
* Returns a set of dentries for a file or dir.
|
|
|
|
*
|
2020-05-31 08:00:20 -04:00
|
|
|
* Note It provides a direct pointer to bh->data via exfat_get_dentry_cached().
|
|
|
|
* User should call exfat_get_dentry_set() after setting 'modified' to apply
|
|
|
|
* changes made in this entry set to the real device.
|
2020-02-03 07:47:19 -05:00
|
|
|
*
|
|
|
|
* in:
|
|
|
|
* sb+p_dir+entry: indicates a file/dir
|
|
|
|
* type: specifies how many dentries should be included.
|
|
|
|
* return:
|
|
|
|
* pointer of entry set on success,
|
|
|
|
* NULL on failure.
|
|
|
|
*/
|
2022-11-25 22:25:14 -05:00
|
|
|
int exfat_get_dentry_set(struct exfat_entry_set_cache *es,
|
|
|
|
struct super_block *sb, struct exfat_chain *p_dir, int entry,
|
|
|
|
unsigned int type)
|
2020-02-03 07:47:19 -05:00
|
|
|
{
|
2020-05-31 08:00:20 -04:00
|
|
|
int ret, i, num_bh;
|
2020-02-03 07:47:19 -05:00
|
|
|
unsigned int off, byte_offset, clu = 0;
|
|
|
|
sector_t sec;
|
|
|
|
struct exfat_sb_info *sbi = EXFAT_SB(sb);
|
2020-05-31 08:00:20 -04:00
|
|
|
struct exfat_dentry *ep;
|
|
|
|
int num_entries;
|
2020-02-03 07:47:19 -05:00
|
|
|
enum exfat_validate_dentry_mode mode = ES_MODE_STARTED;
|
|
|
|
struct buffer_head *bh;
|
|
|
|
|
|
|
|
if (p_dir->dir == DIR_DELETED) {
|
2020-04-05 23:49:36 -04:00
|
|
|
exfat_err(sb, "access to deleted dentry");
|
2022-11-25 22:25:14 -05:00
|
|
|
return -EIO;
|
2020-02-03 07:47:19 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
byte_offset = EXFAT_DEN_TO_B(entry);
|
|
|
|
ret = exfat_walk_fat_chain(sb, p_dir, byte_offset, &clu);
|
|
|
|
if (ret)
|
2022-11-25 22:25:14 -05:00
|
|
|
return ret;
|
2020-02-03 07:47:19 -05:00
|
|
|
|
2022-11-25 22:25:14 -05:00
|
|
|
memset(es, 0, sizeof(*es));
|
2020-05-31 08:00:20 -04:00
|
|
|
es->sb = sb;
|
|
|
|
es->modified = false;
|
|
|
|
|
2020-02-03 07:47:19 -05:00
|
|
|
/* byte offset in cluster */
|
|
|
|
byte_offset = EXFAT_CLU_OFFSET(byte_offset, sbi);
|
|
|
|
|
|
|
|
/* byte offset in sector */
|
|
|
|
off = EXFAT_BLK_OFFSET(byte_offset, sb);
|
2020-05-31 08:00:20 -04:00
|
|
|
es->start_off = off;
|
2022-11-25 22:24:14 -05:00
|
|
|
es->bh = es->__bh;
|
2020-02-03 07:47:19 -05:00
|
|
|
|
|
|
|
/* sector offset in cluster */
|
|
|
|
sec = EXFAT_B_TO_BLK(byte_offset, sb);
|
|
|
|
sec += exfat_cluster_to_sector(sbi, clu);
|
|
|
|
|
|
|
|
bh = sb_bread(sb, sec);
|
|
|
|
if (!bh)
|
2022-11-25 22:25:14 -05:00
|
|
|
return -EIO;
|
2020-05-31 08:00:20 -04:00
|
|
|
es->bh[es->num_bh++] = bh;
|
2020-02-03 07:47:19 -05:00
|
|
|
|
2020-05-31 08:00:20 -04:00
|
|
|
ep = exfat_get_dentry_cached(es, 0);
|
|
|
|
if (!exfat_validate_entry(exfat_get_entry_type(ep), &mode))
|
2022-11-25 22:27:59 -05:00
|
|
|
goto put_es;
|
2020-02-03 07:47:19 -05:00
|
|
|
|
|
|
|
num_entries = type == ES_ALL_ENTRIES ?
|
|
|
|
ep->dentry.file.num_ext + 1 : type;
|
|
|
|
es->num_entries = num_entries;
|
|
|
|
|
2020-05-31 08:00:20 -04:00
|
|
|
num_bh = EXFAT_B_TO_BLK_ROUND_UP(off + num_entries * DENTRY_SIZE, sb);
|
2022-11-25 22:24:14 -05:00
|
|
|
if (num_bh > ARRAY_SIZE(es->__bh)) {
|
|
|
|
es->bh = kmalloc_array(num_bh, sizeof(*es->bh), GFP_KERNEL);
|
|
|
|
if (!es->bh) {
|
|
|
|
brelse(bh);
|
2022-11-25 22:25:14 -05:00
|
|
|
return -ENOMEM;
|
2022-11-25 22:24:14 -05:00
|
|
|
}
|
|
|
|
es->bh[0] = bh;
|
|
|
|
}
|
|
|
|
|
2020-05-31 08:00:20 -04:00
|
|
|
for (i = 1; i < num_bh; i++) {
|
|
|
|
/* get the next sector */
|
|
|
|
if (exfat_is_last_sector_in_cluster(sbi, sec)) {
|
|
|
|
if (p_dir->flags == ALLOC_NO_FAT_CHAIN)
|
|
|
|
clu++;
|
|
|
|
else if (exfat_get_next_cluster(sb, &clu))
|
2022-11-25 22:27:59 -05:00
|
|
|
goto put_es;
|
2020-05-31 08:00:20 -04:00
|
|
|
sec = exfat_cluster_to_sector(sbi, clu);
|
2020-02-03 07:47:19 -05:00
|
|
|
} else {
|
2020-05-31 08:00:20 -04:00
|
|
|
sec++;
|
2020-02-03 07:47:19 -05:00
|
|
|
}
|
2020-05-31 08:00:20 -04:00
|
|
|
|
|
|
|
bh = sb_bread(sb, sec);
|
|
|
|
if (!bh)
|
2022-11-25 22:27:59 -05:00
|
|
|
goto put_es;
|
2020-05-31 08:00:20 -04:00
|
|
|
es->bh[es->num_bh++] = bh;
|
2020-02-03 07:47:19 -05:00
|
|
|
}
|
|
|
|
|
2021-11-02 21:36:05 -04:00
|
|
|
/* validate cached dentries */
|
2020-05-31 08:00:20 -04:00
|
|
|
for (i = 1; i < num_entries; i++) {
|
|
|
|
ep = exfat_get_dentry_cached(es, i);
|
|
|
|
if (!exfat_validate_entry(exfat_get_entry_type(ep), &mode))
|
2022-11-25 22:27:59 -05:00
|
|
|
goto put_es;
|
2020-05-31 08:00:20 -04:00
|
|
|
}
|
2022-11-25 22:25:14 -05:00
|
|
|
return 0;
|
2020-02-03 07:47:19 -05:00
|
|
|
|
2022-11-25 22:27:59 -05:00
|
|
|
put_es:
|
|
|
|
exfat_put_dentry_set(es, false);
|
2022-11-25 22:25:14 -05:00
|
|
|
return -EIO;
|
2020-02-03 07:47:19 -05:00
|
|
|
}
|
|
|
|
|
2022-11-03 19:18:57 -04:00
|
|
|
static inline void exfat_reset_empty_hint(struct exfat_hint_femp *hint_femp)
|
|
|
|
{
|
|
|
|
hint_femp->eidx = EXFAT_HINT_NONE;
|
|
|
|
hint_femp->count = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void exfat_set_empty_hint(struct exfat_inode_info *ei,
|
|
|
|
struct exfat_hint_femp *candi_empty, struct exfat_chain *clu,
|
2022-11-03 19:20:09 -04:00
|
|
|
int dentry, int num_entries, int entry_type)
|
2022-11-03 19:18:57 -04:00
|
|
|
{
|
|
|
|
if (ei->hint_femp.eidx == EXFAT_HINT_NONE ||
|
|
|
|
ei->hint_femp.eidx > dentry) {
|
2022-11-03 19:20:09 -04:00
|
|
|
int total_entries = EXFAT_B_TO_DEN(i_size_read(&ei->vfs_inode));
|
|
|
|
|
2022-11-03 19:18:57 -04:00
|
|
|
if (candi_empty->count == 0) {
|
|
|
|
candi_empty->cur = *clu;
|
|
|
|
candi_empty->eidx = dentry;
|
|
|
|
}
|
|
|
|
|
2022-11-03 19:20:09 -04:00
|
|
|
if (entry_type == TYPE_UNUSED)
|
|
|
|
candi_empty->count += total_entries - dentry;
|
|
|
|
else
|
|
|
|
candi_empty->count++;
|
|
|
|
|
|
|
|
if (candi_empty->count == num_entries ||
|
|
|
|
candi_empty->count + candi_empty->eidx == total_entries)
|
2022-11-03 19:18:57 -04:00
|
|
|
ei->hint_femp = *candi_empty;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2020-02-03 07:47:19 -05:00
|
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enum {
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DIRENT_STEP_FILE,
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DIRENT_STEP_STRM,
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DIRENT_STEP_NAME,
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DIRENT_STEP_SECD,
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};
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/*
|
2021-03-23 23:14:06 -04:00
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* @ei: inode info of parent directory
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* @p_dir: directory structure of parent directory
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* @num_entries:entry size of p_uniname
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* @hint_opt: If p_uniname is found, filled with optimized dir/entry
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* for traversing cluster chain.
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* @return:
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* >= 0: file directory entry position where the name exists
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* -ENOENT: entry with the name does not exist
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* -EIO: I/O error
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2020-02-03 07:47:19 -05:00
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*/
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int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei,
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struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,
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2021-03-23 23:14:06 -04:00
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int num_entries, unsigned int type, struct exfat_hint *hint_opt)
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2020-02-03 07:47:19 -05:00
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{
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int i, rewind = 0, dentry = 0, end_eidx = 0, num_ext = 0, len;
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int order, step, name_len = 0;
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2022-11-03 19:18:57 -04:00
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int dentries_per_clu;
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2020-02-03 07:47:19 -05:00
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unsigned int entry_type;
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unsigned short *uniname = NULL;
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struct exfat_chain clu;
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struct exfat_hint *hint_stat = &ei->hint_stat;
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struct exfat_hint_femp candi_empty;
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struct exfat_sb_info *sbi = EXFAT_SB(sb);
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dentries_per_clu = sbi->dentries_per_clu;
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exfat_chain_dup(&clu, p_dir);
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if (hint_stat->eidx) {
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clu.dir = hint_stat->clu;
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dentry = hint_stat->eidx;
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end_eidx = dentry;
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}
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2022-11-03 19:18:57 -04:00
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exfat_reset_empty_hint(&ei->hint_femp);
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2020-02-03 07:47:19 -05:00
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rewind:
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order = 0;
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step = DIRENT_STEP_FILE;
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2022-11-03 19:18:57 -04:00
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exfat_reset_empty_hint(&candi_empty);
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2020-02-03 07:47:19 -05:00
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while (clu.dir != EXFAT_EOF_CLUSTER) {
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i = dentry & (dentries_per_clu - 1);
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for (; i < dentries_per_clu; i++, dentry++) {
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struct exfat_dentry *ep;
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struct buffer_head *bh;
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if (rewind && dentry == end_eidx)
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goto not_found;
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|
2021-12-16 07:29:58 -05:00
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ep = exfat_get_dentry(sb, &clu, i, &bh);
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2020-02-03 07:47:19 -05:00
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if (!ep)
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return -EIO;
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entry_type = exfat_get_entry_type(ep);
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if (entry_type == TYPE_UNUSED ||
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entry_type == TYPE_DELETED) {
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step = DIRENT_STEP_FILE;
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|
2022-11-03 19:18:57 -04:00
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exfat_set_empty_hint(ei, &candi_empty, &clu,
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2022-11-03 19:20:09 -04:00
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dentry, num_entries,
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entry_type);
|
2020-02-03 07:47:19 -05:00
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brelse(bh);
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if (entry_type == TYPE_UNUSED)
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goto not_found;
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continue;
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}
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|
2022-11-03 19:18:57 -04:00
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exfat_reset_empty_hint(&candi_empty);
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2020-02-03 07:47:19 -05:00
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if (entry_type == TYPE_FILE || entry_type == TYPE_DIR) {
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step = DIRENT_STEP_FILE;
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2021-03-23 23:14:06 -04:00
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hint_opt->clu = clu.dir;
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hint_opt->eidx = i;
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2020-02-03 07:47:19 -05:00
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if (type == TYPE_ALL || type == entry_type) {
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num_ext = ep->dentry.file.num_ext;
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step = DIRENT_STEP_STRM;
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}
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brelse(bh);
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continue;
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}
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if (entry_type == TYPE_STREAM) {
|
2020-05-31 08:04:00 -04:00
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u16 name_hash;
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2020-02-03 07:47:19 -05:00
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if (step != DIRENT_STEP_STRM) {
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step = DIRENT_STEP_FILE;
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brelse(bh);
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continue;
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}
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step = DIRENT_STEP_FILE;
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name_hash = le16_to_cpu(
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ep->dentry.stream.name_hash);
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if (p_uniname->name_hash == name_hash &&
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p_uniname->name_len ==
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ep->dentry.stream.name_len) {
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step = DIRENT_STEP_NAME;
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order = 1;
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name_len = 0;
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}
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brelse(bh);
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continue;
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}
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brelse(bh);
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if (entry_type == TYPE_EXTEND) {
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unsigned short entry_uniname[16], unichar;
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if (step != DIRENT_STEP_NAME) {
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step = DIRENT_STEP_FILE;
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continue;
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}
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if (++order == 2)
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uniname = p_uniname->name;
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else
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uniname += EXFAT_FILE_NAME_LEN;
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len = exfat_extract_uni_name(ep, entry_uniname);
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name_len += len;
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unichar = *(uniname+len);
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*(uniname+len) = 0x0;
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if (exfat_uniname_ncmp(sb, uniname,
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entry_uniname, len)) {
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step = DIRENT_STEP_FILE;
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} else if (p_uniname->name_len == name_len) {
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if (order == num_ext)
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goto found;
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step = DIRENT_STEP_SECD;
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}
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*(uniname+len) = unichar;
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continue;
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}
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if (entry_type &
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(TYPE_CRITICAL_SEC | TYPE_BENIGN_SEC)) {
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if (step == DIRENT_STEP_SECD) {
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if (++order == num_ext)
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goto found;
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continue;
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}
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}
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step = DIRENT_STEP_FILE;
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}
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if (clu.flags == ALLOC_NO_FAT_CHAIN) {
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if (--clu.size > 0)
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clu.dir++;
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else
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clu.dir = EXFAT_EOF_CLUSTER;
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} else {
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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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}
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not_found:
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/*
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* We started at not 0 index,so we should try to find target
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* from 0 index to the index we started at.
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*/
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if (!rewind && end_eidx) {
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rewind = 1;
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dentry = 0;
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clu.dir = p_dir->dir;
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goto rewind;
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}
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2022-11-03 19:20:09 -04:00
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/*
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* set the EXFAT_EOF_CLUSTER flag to avoid search
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* from the beginning again when allocated a new cluster
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*/
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if (ei->hint_femp.eidx == EXFAT_HINT_NONE) {
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ei->hint_femp.cur.dir = EXFAT_EOF_CLUSTER;
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ei->hint_femp.eidx = p_dir->size * dentries_per_clu;
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ei->hint_femp.count = 0;
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}
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2020-02-03 07:47:19 -05:00
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/* initialized hint_stat */
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hint_stat->clu = p_dir->dir;
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hint_stat->eidx = 0;
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return -ENOENT;
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found:
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/* next dentry we'll find is out of this cluster */
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if (!((dentry + 1) & (dentries_per_clu - 1))) {
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int ret = 0;
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if (clu.flags == ALLOC_NO_FAT_CHAIN) {
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if (--clu.size > 0)
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clu.dir++;
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else
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clu.dir = EXFAT_EOF_CLUSTER;
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} else {
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ret = exfat_get_next_cluster(sb, &clu.dir);
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}
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|
2020-07-02 08:48:01 -04:00
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if (ret || clu.dir == EXFAT_EOF_CLUSTER) {
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2020-02-03 07:47:19 -05:00
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/* just initialized hint_stat */
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hint_stat->clu = p_dir->dir;
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hint_stat->eidx = 0;
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return (dentry - num_ext);
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}
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}
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hint_stat->clu = clu.dir;
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hint_stat->eidx = dentry + 1;
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return dentry - num_ext;
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}
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int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir,
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int entry, struct exfat_dentry *ep)
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{
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int i, count = 0;
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unsigned int type;
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struct exfat_dentry *ext_ep;
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struct buffer_head *bh;
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for (i = 0, entry++; i < ep->dentry.file.num_ext; i++, entry++) {
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2021-12-16 07:29:58 -05:00
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ext_ep = exfat_get_dentry(sb, p_dir, entry, &bh);
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2020-02-03 07:47:19 -05:00
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if (!ext_ep)
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return -EIO;
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type = exfat_get_entry_type(ext_ep);
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brelse(bh);
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if (type == TYPE_EXTEND || type == TYPE_STREAM)
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count++;
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else
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break;
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}
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return count;
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}
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int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir)
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{
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int i, count = 0;
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int dentries_per_clu;
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unsigned int entry_type;
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struct exfat_chain clu;
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struct exfat_dentry *ep;
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struct exfat_sb_info *sbi = EXFAT_SB(sb);
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struct buffer_head *bh;
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dentries_per_clu = sbi->dentries_per_clu;
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exfat_chain_dup(&clu, p_dir);
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while (clu.dir != EXFAT_EOF_CLUSTER) {
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for (i = 0; i < dentries_per_clu; i++) {
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2021-12-16 07:29:58 -05:00
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ep = exfat_get_dentry(sb, &clu, i, &bh);
|
2020-02-03 07:47:19 -05:00
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if (!ep)
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return -EIO;
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entry_type = exfat_get_entry_type(ep);
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brelse(bh);
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if (entry_type == TYPE_UNUSED)
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return count;
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if (entry_type != TYPE_DIR)
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continue;
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count++;
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}
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if (clu.flags == ALLOC_NO_FAT_CHAIN) {
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if (--clu.size > 0)
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clu.dir++;
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else
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clu.dir = EXFAT_EOF_CLUSTER;
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} else {
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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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}
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return count;
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}
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