1239 строки
29 KiB
C
1239 строки
29 KiB
C
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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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#include <linux/slab.h>
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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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struct exfat_dentry *ep;
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struct exfat_entry_set_cache *es;
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es = exfat_get_dentry_set(sb, p_dir, entry, ES_ALL_ENTRIES, &ep);
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if (!es)
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return;
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if (es->num_entries < 3)
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goto free_es;
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ep += 2;
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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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for (i = 2; i < es->num_entries; i++, ep++) {
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/* end of name entry */
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if (exfat_get_entry_type(ep) != TYPE_EXTEND)
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goto free_es;
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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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free_es:
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kfree(es);
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}
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/* read a directory entry from the opened directory */
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static int exfat_readdir(struct inode *inode, struct exfat_dir_entry *dir_entry)
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{
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int i, dentries_per_clu, dentries_per_clu_bits = 0;
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unsigned int type, clu_offset;
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sector_t sector;
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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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unsigned int dentry = ei->rwoffset & 0xFFFFFFFF;
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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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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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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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ep = exfat_get_dentry(sb, &clu, i, &bh, §or);
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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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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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ep->dentry.file.create_time_ms);
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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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ep->dentry.file.modify_time_ms);
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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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exfat_get_uniname_from_ext_entry(sb, &dir, dentry,
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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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ep = exfat_get_dentry(sb, &clu, i + 1, &bh, NULL);
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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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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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ei->rwoffset = ++dentry;
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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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ei->rwoffset = dentry;
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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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ei->rwoffset = EXFAT_B_TO_DEN(cpos);
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if (cpos >= i_size_read(inode))
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goto end_of_dir;
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err = exfat_readdir(inode, &de);
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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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cpos = EXFAT_DEN_TO_B(ei->rwoffset);
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if (!nb->lfn[0])
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goto end_of_dir;
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i_pos = ((loff_t)ei->start_clu << 32) |
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((ei->rwoffset - 1) & 0xffffffff);
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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,
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.fsync = generic_file_fsync,
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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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ret = exfat_alloc_cluster(inode, 1, clu);
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if (ret)
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return ret;
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return exfat_zeroed_cluster(inode, clu->dir);
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}
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int exfat_calc_num_entries(struct exfat_uni_name *p_uniname)
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{
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int len;
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len = p_uniname->name_len;
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if (len == 0)
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return -EINVAL;
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/* 1 file entry + 1 stream entry + name entries */
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return ((len - 1) / EXFAT_FILE_NAME_LEN + 3);
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}
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unsigned int exfat_get_entry_type(struct exfat_dentry *ep)
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{
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if (ep->type == EXFAT_UNUSED)
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return TYPE_UNUSED;
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if (IS_EXFAT_DELETED(ep->type))
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return TYPE_DELETED;
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if (ep->type == EXFAT_INVAL)
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return TYPE_INVALID;
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if (IS_EXFAT_CRITICAL_PRI(ep->type)) {
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if (ep->type == EXFAT_BITMAP)
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return TYPE_BITMAP;
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if (ep->type == EXFAT_UPCASE)
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return TYPE_UPCASE;
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if (ep->type == EXFAT_VOLUME)
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return TYPE_VOLUME;
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if (ep->type == EXFAT_FILE) {
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if (le16_to_cpu(ep->dentry.file.attr) & ATTR_SUBDIR)
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return TYPE_DIR;
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return TYPE_FILE;
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}
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return TYPE_CRITICAL_PRI;
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}
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if (IS_EXFAT_BENIGN_PRI(ep->type)) {
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if (ep->type == EXFAT_GUID)
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return TYPE_GUID;
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if (ep->type == EXFAT_PADDING)
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return TYPE_PADDING;
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if (ep->type == EXFAT_ACLTAB)
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return TYPE_ACLTAB;
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return TYPE_BENIGN_PRI;
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}
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if (IS_EXFAT_CRITICAL_SEC(ep->type)) {
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if (ep->type == EXFAT_STREAM)
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return TYPE_STREAM;
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if (ep->type == EXFAT_NAME)
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return TYPE_EXTEND;
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if (ep->type == EXFAT_ACL)
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return TYPE_ACL;
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return TYPE_CRITICAL_SEC;
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}
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return TYPE_BENIGN_SEC;
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}
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static void exfat_set_entry_type(struct exfat_dentry *ep, unsigned int type)
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{
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if (type == TYPE_UNUSED) {
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ep->type = EXFAT_UNUSED;
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} else if (type == TYPE_DELETED) {
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ep->type &= EXFAT_DELETE;
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} else if (type == TYPE_STREAM) {
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ep->type = EXFAT_STREAM;
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} else if (type == TYPE_EXTEND) {
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ep->type = EXFAT_NAME;
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} else if (type == TYPE_BITMAP) {
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ep->type = EXFAT_BITMAP;
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} else if (type == TYPE_UPCASE) {
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ep->type = EXFAT_UPCASE;
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} else if (type == TYPE_VOLUME) {
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ep->type = EXFAT_VOLUME;
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} else if (type == TYPE_DIR) {
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ep->type = EXFAT_FILE;
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ep->dentry.file.attr = cpu_to_le16(ATTR_SUBDIR);
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} else if (type == TYPE_FILE) {
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ep->type = EXFAT_FILE;
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ep->dentry.file.attr = cpu_to_le16(ATTR_ARCHIVE);
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}
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}
|
||
|
|
||
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static void exfat_init_stream_entry(struct exfat_dentry *ep,
|
||
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unsigned char flags, unsigned int start_clu,
|
||
|
unsigned long long size)
|
||
|
{
|
||
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exfat_set_entry_type(ep, TYPE_STREAM);
|
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ep->dentry.stream.flags = flags;
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ep->dentry.stream.start_clu = cpu_to_le32(start_clu);
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ep->dentry.stream.valid_size = cpu_to_le64(size);
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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++) {
|
||
|
ep->dentry.name.unicode_0_14[i] = cpu_to_le16(*uniname);
|
||
|
if (*uniname == 0x0)
|
||
|
break;
|
||
|
uniname++;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
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);
|
||
|
struct timespec64 ts = current_time(inode);
|
||
|
sector_t sector;
|
||
|
struct exfat_dentry *ep;
|
||
|
struct buffer_head *bh;
|
||
|
|
||
|
/*
|
||
|
* We cannot use exfat_get_dentry_set here because file ep is not
|
||
|
* initialized yet.
|
||
|
*/
|
||
|
ep = exfat_get_dentry(sb, p_dir, entry, &bh, §or);
|
||
|
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,
|
||
|
&ep->dentry.file.create_time_ms);
|
||
|
exfat_set_entry_time(sbi, &ts,
|
||
|
&ep->dentry.file.modify_tz,
|
||
|
&ep->dentry.file.modify_time,
|
||
|
&ep->dentry.file.modify_date,
|
||
|
&ep->dentry.file.modify_time_ms);
|
||
|
exfat_set_entry_time(sbi, &ts,
|
||
|
&ep->dentry.file.access_tz,
|
||
|
&ep->dentry.file.access_time,
|
||
|
&ep->dentry.file.access_date,
|
||
|
NULL);
|
||
|
|
||
|
exfat_update_bh(sb, bh, IS_DIRSYNC(inode));
|
||
|
brelse(bh);
|
||
|
|
||
|
ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh, §or);
|
||
|
if (!ep)
|
||
|
return -EIO;
|
||
|
|
||
|
exfat_init_stream_entry(ep,
|
||
|
(type == TYPE_FILE) ? ALLOC_FAT_CHAIN : ALLOC_NO_FAT_CHAIN,
|
||
|
start_clu, size);
|
||
|
exfat_update_bh(sb, bh, IS_DIRSYNC(inode));
|
||
|
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;
|
||
|
sector_t sector;
|
||
|
unsigned short chksum;
|
||
|
struct exfat_dentry *ep, *fep;
|
||
|
struct buffer_head *fbh, *bh;
|
||
|
|
||
|
fep = exfat_get_dentry(sb, p_dir, entry, &fbh, §or);
|
||
|
if (!fep)
|
||
|
return -EIO;
|
||
|
|
||
|
num_entries = fep->dentry.file.num_ext + 1;
|
||
|
chksum = exfat_calc_chksum_2byte(fep, DENTRY_SIZE, 0, CS_DIR_ENTRY);
|
||
|
|
||
|
for (i = 1; i < num_entries; i++) {
|
||
|
ep = exfat_get_dentry(sb, p_dir, entry + i, &bh, NULL);
|
||
|
if (!ep) {
|
||
|
ret = -EIO;
|
||
|
goto release_fbh;
|
||
|
}
|
||
|
chksum = exfat_calc_chksum_2byte(ep, DENTRY_SIZE, chksum,
|
||
|
CS_DEFAULT);
|
||
|
brelse(bh);
|
||
|
}
|
||
|
|
||
|
fep->dentry.file.checksum = cpu_to_le16(chksum);
|
||
|
exfat_update_bh(sb, fbh, IS_DIRSYNC(inode));
|
||
|
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;
|
||
|
sector_t sector;
|
||
|
unsigned short *uniname = p_uniname->name;
|
||
|
struct exfat_dentry *ep;
|
||
|
struct buffer_head *bh;
|
||
|
int sync = IS_DIRSYNC(inode);
|
||
|
|
||
|
ep = exfat_get_dentry(sb, p_dir, entry, &bh, §or);
|
||
|
if (!ep)
|
||
|
return -EIO;
|
||
|
|
||
|
ep->dentry.file.num_ext = (unsigned char)(num_entries - 1);
|
||
|
exfat_update_bh(sb, bh, sync);
|
||
|
brelse(bh);
|
||
|
|
||
|
ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh, §or);
|
||
|
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);
|
||
|
exfat_update_bh(sb, bh, sync);
|
||
|
brelse(bh);
|
||
|
|
||
|
for (i = EXFAT_FIRST_CLUSTER; i < num_entries; i++) {
|
||
|
ep = exfat_get_dentry(sb, p_dir, entry + i, &bh, §or);
|
||
|
if (!ep)
|
||
|
return -EIO;
|
||
|
|
||
|
exfat_init_name_entry(ep, uniname);
|
||
|
exfat_update_bh(sb, bh, sync);
|
||
|
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;
|
||
|
sector_t sector;
|
||
|
struct exfat_dentry *ep;
|
||
|
struct buffer_head *bh;
|
||
|
|
||
|
for (i = order; i < num_entries; i++) {
|
||
|
ep = exfat_get_dentry(sb, p_dir, entry + i, &bh, §or);
|
||
|
if (!ep)
|
||
|
return -EIO;
|
||
|
|
||
|
exfat_set_entry_type(ep, TYPE_DELETED);
|
||
|
exfat_update_bh(sb, bh, IS_DIRSYNC(inode));
|
||
|
brelse(bh);
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
int exfat_update_dir_chksum_with_entry_set(struct super_block *sb,
|
||
|
struct exfat_entry_set_cache *es, int sync)
|
||
|
{
|
||
|
struct exfat_sb_info *sbi = EXFAT_SB(sb);
|
||
|
struct buffer_head *bh;
|
||
|
sector_t sec = es->sector;
|
||
|
unsigned int off = es->offset;
|
||
|
int chksum_type = CS_DIR_ENTRY, i, num_entries = es->num_entries;
|
||
|
unsigned int buf_off = (off - es->offset);
|
||
|
unsigned int remaining_byte_in_sector, copy_entries, clu;
|
||
|
unsigned short chksum = 0;
|
||
|
|
||
|
for (i = 0; i < num_entries; i++) {
|
||
|
chksum = exfat_calc_chksum_2byte(&es->entries[i], DENTRY_SIZE,
|
||
|
chksum, chksum_type);
|
||
|
chksum_type = CS_DEFAULT;
|
||
|
}
|
||
|
|
||
|
es->entries[0].dentry.file.checksum = cpu_to_le16(chksum);
|
||
|
|
||
|
while (num_entries) {
|
||
|
/* write per sector base */
|
||
|
remaining_byte_in_sector = (1 << sb->s_blocksize_bits) - off;
|
||
|
copy_entries = min_t(int,
|
||
|
EXFAT_B_TO_DEN(remaining_byte_in_sector),
|
||
|
num_entries);
|
||
|
bh = sb_bread(sb, sec);
|
||
|
if (!bh)
|
||
|
goto err_out;
|
||
|
memcpy(bh->b_data + off,
|
||
|
(unsigned char *)&es->entries[0] + buf_off,
|
||
|
EXFAT_DEN_TO_B(copy_entries));
|
||
|
exfat_update_bh(sb, bh, sync);
|
||
|
brelse(bh);
|
||
|
num_entries -= copy_entries;
|
||
|
|
||
|
if (num_entries) {
|
||
|
/* get next sector */
|
||
|
if (exfat_is_last_sector_in_cluster(sbi, sec)) {
|
||
|
clu = exfat_sector_to_cluster(sbi, sec);
|
||
|
if (es->alloc_flag == ALLOC_NO_FAT_CHAIN)
|
||
|
clu++;
|
||
|
else if (exfat_get_next_cluster(sb, &clu))
|
||
|
goto err_out;
|
||
|
sec = exfat_cluster_to_sector(sbi, clu);
|
||
|
} else {
|
||
|
sec++;
|
||
|
}
|
||
|
off = 0;
|
||
|
buf_off += EXFAT_DEN_TO_B(copy_entries);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
err_out:
|
||
|
return -EIO;
|
||
|
}
|
||
|
|
||
|
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;
|
||
|
}
|
||
|
|
||
|
int exfat_find_location(struct super_block *sb, struct exfat_chain *p_dir,
|
||
|
int entry, sector_t *sector, int *offset)
|
||
|
{
|
||
|
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) {
|
||
|
exfat_msg(sb, KERN_ERR,
|
||
|
"requested sector is invalid(sect:%llu, root:%llu)",
|
||
|
(unsigned long long)sec, sbi->data_start_sector);
|
||
|
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,
|
||
|
struct exfat_chain *p_dir, int entry, struct buffer_head **bh,
|
||
|
sector_t *sector)
|
||
|
{
|
||
|
unsigned int dentries_per_page = EXFAT_B_TO_DEN(PAGE_SIZE);
|
||
|
int off;
|
||
|
sector_t sec;
|
||
|
|
||
|
if (p_dir->dir == DIR_DELETED) {
|
||
|
exfat_msg(sb, KERN_ERR, "abnormal access to deleted dentry\n");
|
||
|
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;
|
||
|
|
||
|
if (sector)
|
||
|
*sector = sec;
|
||
|
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;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Returns a set of dentries for a file or dir.
|
||
|
*
|
||
|
* Note that this is a copy (dump) of dentries so that user should
|
||
|
* call write_entry_set() to apply changes made in this entry set
|
||
|
* to the real device.
|
||
|
*
|
||
|
* in:
|
||
|
* sb+p_dir+entry: indicates a file/dir
|
||
|
* type: specifies how many dentries should be included.
|
||
|
* out:
|
||
|
* file_ep: will point the first dentry(= file dentry) on success
|
||
|
* return:
|
||
|
* pointer of entry set on success,
|
||
|
* NULL on failure.
|
||
|
*/
|
||
|
struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb,
|
||
|
struct exfat_chain *p_dir, int entry, unsigned int type,
|
||
|
struct exfat_dentry **file_ep)
|
||
|
{
|
||
|
int ret;
|
||
|
unsigned int off, byte_offset, clu = 0;
|
||
|
unsigned int entry_type;
|
||
|
sector_t sec;
|
||
|
struct exfat_sb_info *sbi = EXFAT_SB(sb);
|
||
|
struct exfat_entry_set_cache *es;
|
||
|
struct exfat_dentry *ep, *pos;
|
||
|
unsigned char num_entries;
|
||
|
enum exfat_validate_dentry_mode mode = ES_MODE_STARTED;
|
||
|
struct buffer_head *bh;
|
||
|
|
||
|
if (p_dir->dir == DIR_DELETED) {
|
||
|
exfat_msg(sb, KERN_ERR, "access to deleted dentry\n");
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
byte_offset = EXFAT_DEN_TO_B(entry);
|
||
|
ret = exfat_walk_fat_chain(sb, p_dir, byte_offset, &clu);
|
||
|
if (ret)
|
||
|
return NULL;
|
||
|
|
||
|
/* byte offset in cluster */
|
||
|
byte_offset = EXFAT_CLU_OFFSET(byte_offset, sbi);
|
||
|
|
||
|
/* byte offset in sector */
|
||
|
off = EXFAT_BLK_OFFSET(byte_offset, sb);
|
||
|
|
||
|
/* 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)
|
||
|
return NULL;
|
||
|
|
||
|
ep = (struct exfat_dentry *)(bh->b_data + off);
|
||
|
entry_type = exfat_get_entry_type(ep);
|
||
|
|
||
|
if (entry_type != TYPE_FILE && entry_type != TYPE_DIR)
|
||
|
goto release_bh;
|
||
|
|
||
|
num_entries = type == ES_ALL_ENTRIES ?
|
||
|
ep->dentry.file.num_ext + 1 : type;
|
||
|
es = kmalloc(struct_size(es, entries, num_entries), GFP_KERNEL);
|
||
|
if (!es)
|
||
|
goto release_bh;
|
||
|
|
||
|
es->num_entries = num_entries;
|
||
|
es->sector = sec;
|
||
|
es->offset = off;
|
||
|
es->alloc_flag = p_dir->flags;
|
||
|
|
||
|
pos = &es->entries[0];
|
||
|
|
||
|
while (num_entries) {
|
||
|
if (!exfat_validate_entry(exfat_get_entry_type(ep), &mode))
|
||
|
goto free_es;
|
||
|
|
||
|
/* copy dentry */
|
||
|
memcpy(pos, ep, sizeof(struct exfat_dentry));
|
||
|
|
||
|
if (--num_entries == 0)
|
||
|
break;
|
||
|
|
||
|
if (((off + DENTRY_SIZE) & (sb->s_blocksize - 1)) <
|
||
|
(off & (sb->s_blocksize - 1))) {
|
||
|
/* get the next sector */
|
||
|
if (exfat_is_last_sector_in_cluster(sbi, sec)) {
|
||
|
if (es->alloc_flag == ALLOC_NO_FAT_CHAIN)
|
||
|
clu++;
|
||
|
else if (exfat_get_next_cluster(sb, &clu))
|
||
|
goto free_es;
|
||
|
sec = exfat_cluster_to_sector(sbi, clu);
|
||
|
} else {
|
||
|
sec++;
|
||
|
}
|
||
|
|
||
|
brelse(bh);
|
||
|
bh = sb_bread(sb, sec);
|
||
|
if (!bh)
|
||
|
goto free_es;
|
||
|
off = 0;
|
||
|
ep = (struct exfat_dentry *)bh->b_data;
|
||
|
} else {
|
||
|
ep++;
|
||
|
off += DENTRY_SIZE;
|
||
|
}
|
||
|
pos++;
|
||
|
}
|
||
|
|
||
|
if (file_ep)
|
||
|
*file_ep = &es->entries[0];
|
||
|
brelse(bh);
|
||
|
return es;
|
||
|
|
||
|
free_es:
|
||
|
kfree(es);
|
||
|
release_bh:
|
||
|
brelse(bh);
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
enum {
|
||
|
DIRENT_STEP_FILE,
|
||
|
DIRENT_STEP_STRM,
|
||
|
DIRENT_STEP_NAME,
|
||
|
DIRENT_STEP_SECD,
|
||
|
};
|
||
|
|
||
|
/*
|
||
|
* return values:
|
||
|
* >= 0 : return dir entiry position with the name in dir
|
||
|
* -EEXIST : (root dir, ".") it is the root dir itself
|
||
|
* -ENOENT : entry with the name does not exist
|
||
|
* -EIO : I/O error
|
||
|
*/
|
||
|
int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei,
|
||
|
struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,
|
||
|
int num_entries, unsigned int type)
|
||
|
{
|
||
|
int i, rewind = 0, dentry = 0, end_eidx = 0, num_ext = 0, len;
|
||
|
int order, step, name_len = 0;
|
||
|
int dentries_per_clu, num_empty = 0;
|
||
|
unsigned int entry_type;
|
||
|
unsigned short *uniname = NULL;
|
||
|
struct exfat_chain clu;
|
||
|
struct exfat_hint *hint_stat = &ei->hint_stat;
|
||
|
struct exfat_hint_femp candi_empty;
|
||
|
struct exfat_sb_info *sbi = EXFAT_SB(sb);
|
||
|
|
||
|
dentries_per_clu = sbi->dentries_per_clu;
|
||
|
|
||
|
exfat_chain_dup(&clu, p_dir);
|
||
|
|
||
|
if (hint_stat->eidx) {
|
||
|
clu.dir = hint_stat->clu;
|
||
|
dentry = hint_stat->eidx;
|
||
|
end_eidx = dentry;
|
||
|
}
|
||
|
|
||
|
candi_empty.eidx = EXFAT_HINT_NONE;
|
||
|
rewind:
|
||
|
order = 0;
|
||
|
step = DIRENT_STEP_FILE;
|
||
|
while (clu.dir != EXFAT_EOF_CLUSTER) {
|
||
|
i = dentry & (dentries_per_clu - 1);
|
||
|
for (; i < dentries_per_clu; i++, dentry++) {
|
||
|
struct exfat_dentry *ep;
|
||
|
struct buffer_head *bh;
|
||
|
|
||
|
if (rewind && dentry == end_eidx)
|
||
|
goto not_found;
|
||
|
|
||
|
ep = exfat_get_dentry(sb, &clu, i, &bh, NULL);
|
||
|
if (!ep)
|
||
|
return -EIO;
|
||
|
|
||
|
entry_type = exfat_get_entry_type(ep);
|
||
|
|
||
|
if (entry_type == TYPE_UNUSED ||
|
||
|
entry_type == TYPE_DELETED) {
|
||
|
step = DIRENT_STEP_FILE;
|
||
|
|
||
|
num_empty++;
|
||
|
if (candi_empty.eidx == EXFAT_HINT_NONE &&
|
||
|
num_empty == 1) {
|
||
|
exfat_chain_set(&candi_empty.cur,
|
||
|
clu.dir, clu.size, clu.flags);
|
||
|
}
|
||
|
|
||
|
if (candi_empty.eidx == EXFAT_HINT_NONE &&
|
||
|
num_empty >= num_entries) {
|
||
|
candi_empty.eidx =
|
||
|
dentry - (num_empty - 1);
|
||
|
WARN_ON(candi_empty.eidx < 0);
|
||
|
candi_empty.count = num_empty;
|
||
|
|
||
|
if (ei->hint_femp.eidx ==
|
||
|
EXFAT_HINT_NONE ||
|
||
|
candi_empty.eidx <=
|
||
|
ei->hint_femp.eidx) {
|
||
|
memcpy(&ei->hint_femp,
|
||
|
&candi_empty,
|
||
|
sizeof(candi_empty));
|
||
|
}
|
||
|
}
|
||
|
|
||
|
brelse(bh);
|
||
|
if (entry_type == TYPE_UNUSED)
|
||
|
goto not_found;
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
num_empty = 0;
|
||
|
candi_empty.eidx = EXFAT_HINT_NONE;
|
||
|
|
||
|
if (entry_type == TYPE_FILE || entry_type == TYPE_DIR) {
|
||
|
step = DIRENT_STEP_FILE;
|
||
|
if (type == TYPE_ALL || type == entry_type) {
|
||
|
num_ext = ep->dentry.file.num_ext;
|
||
|
step = DIRENT_STEP_STRM;
|
||
|
}
|
||
|
brelse(bh);
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
if (entry_type == TYPE_STREAM) {
|
||
|
unsigned short name_hash;
|
||
|
|
||
|
if (step != DIRENT_STEP_STRM) {
|
||
|
step = DIRENT_STEP_FILE;
|
||
|
brelse(bh);
|
||
|
continue;
|
||
|
}
|
||
|
step = DIRENT_STEP_FILE;
|
||
|
name_hash = le16_to_cpu(
|
||
|
ep->dentry.stream.name_hash);
|
||
|
if (p_uniname->name_hash == name_hash &&
|
||
|
p_uniname->name_len ==
|
||
|
ep->dentry.stream.name_len) {
|
||
|
step = DIRENT_STEP_NAME;
|
||
|
order = 1;
|
||
|
name_len = 0;
|
||
|
}
|
||
|
brelse(bh);
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
brelse(bh);
|
||
|
if (entry_type == TYPE_EXTEND) {
|
||
|
unsigned short entry_uniname[16], unichar;
|
||
|
|
||
|
if (step != DIRENT_STEP_NAME) {
|
||
|
step = DIRENT_STEP_FILE;
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
if (++order == 2)
|
||
|
uniname = p_uniname->name;
|
||
|
else
|
||
|
uniname += EXFAT_FILE_NAME_LEN;
|
||
|
|
||
|
len = exfat_extract_uni_name(ep, entry_uniname);
|
||
|
name_len += len;
|
||
|
|
||
|
unichar = *(uniname+len);
|
||
|
*(uniname+len) = 0x0;
|
||
|
|
||
|
if (exfat_uniname_ncmp(sb, uniname,
|
||
|
entry_uniname, len)) {
|
||
|
step = DIRENT_STEP_FILE;
|
||
|
} else if (p_uniname->name_len == name_len) {
|
||
|
if (order == num_ext)
|
||
|
goto found;
|
||
|
step = DIRENT_STEP_SECD;
|
||
|
}
|
||
|
|
||
|
*(uniname+len) = unichar;
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
if (entry_type &
|
||
|
(TYPE_CRITICAL_SEC | TYPE_BENIGN_SEC)) {
|
||
|
if (step == DIRENT_STEP_SECD) {
|
||
|
if (++order == num_ext)
|
||
|
goto found;
|
||
|
continue;
|
||
|
}
|
||
|
}
|
||
|
step = DIRENT_STEP_FILE;
|
||
|
}
|
||
|
|
||
|
if (clu.flags == ALLOC_NO_FAT_CHAIN) {
|
||
|
if (--clu.size > 0)
|
||
|
clu.dir++;
|
||
|
else
|
||
|
clu.dir = EXFAT_EOF_CLUSTER;
|
||
|
} else {
|
||
|
if (exfat_get_next_cluster(sb, &clu.dir))
|
||
|
return -EIO;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
not_found:
|
||
|
/*
|
||
|
* We started at not 0 index,so we should try to find target
|
||
|
* from 0 index to the index we started at.
|
||
|
*/
|
||
|
if (!rewind && end_eidx) {
|
||
|
rewind = 1;
|
||
|
dentry = 0;
|
||
|
clu.dir = p_dir->dir;
|
||
|
/* reset empty hint */
|
||
|
num_empty = 0;
|
||
|
candi_empty.eidx = EXFAT_HINT_NONE;
|
||
|
goto rewind;
|
||
|
}
|
||
|
|
||
|
/* initialized hint_stat */
|
||
|
hint_stat->clu = p_dir->dir;
|
||
|
hint_stat->eidx = 0;
|
||
|
return -ENOENT;
|
||
|
|
||
|
found:
|
||
|
/* next dentry we'll find is out of this cluster */
|
||
|
if (!((dentry + 1) & (dentries_per_clu - 1))) {
|
||
|
int ret = 0;
|
||
|
|
||
|
if (clu.flags == ALLOC_NO_FAT_CHAIN) {
|
||
|
if (--clu.size > 0)
|
||
|
clu.dir++;
|
||
|
else
|
||
|
clu.dir = EXFAT_EOF_CLUSTER;
|
||
|
} else {
|
||
|
ret = exfat_get_next_cluster(sb, &clu.dir);
|
||
|
}
|
||
|
|
||
|
if (ret || clu.dir != EXFAT_EOF_CLUSTER) {
|
||
|
/* just initialized hint_stat */
|
||
|
hint_stat->clu = p_dir->dir;
|
||
|
hint_stat->eidx = 0;
|
||
|
return (dentry - num_ext);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
hint_stat->clu = clu.dir;
|
||
|
hint_stat->eidx = dentry + 1;
|
||
|
return dentry - num_ext;
|
||
|
}
|
||
|
|
||
|
int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir,
|
||
|
int entry, struct exfat_dentry *ep)
|
||
|
{
|
||
|
int i, count = 0;
|
||
|
unsigned int type;
|
||
|
struct exfat_dentry *ext_ep;
|
||
|
struct buffer_head *bh;
|
||
|
|
||
|
for (i = 0, entry++; i < ep->dentry.file.num_ext; i++, entry++) {
|
||
|
ext_ep = exfat_get_dentry(sb, p_dir, entry, &bh, NULL);
|
||
|
if (!ext_ep)
|
||
|
return -EIO;
|
||
|
|
||
|
type = exfat_get_entry_type(ext_ep);
|
||
|
brelse(bh);
|
||
|
if (type == TYPE_EXTEND || type == TYPE_STREAM)
|
||
|
count++;
|
||
|
else
|
||
|
break;
|
||
|
}
|
||
|
return count;
|
||
|
}
|
||
|
|
||
|
int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir)
|
||
|
{
|
||
|
int i, count = 0;
|
||
|
int dentries_per_clu;
|
||
|
unsigned int entry_type;
|
||
|
struct exfat_chain clu;
|
||
|
struct exfat_dentry *ep;
|
||
|
struct exfat_sb_info *sbi = EXFAT_SB(sb);
|
||
|
struct buffer_head *bh;
|
||
|
|
||
|
dentries_per_clu = sbi->dentries_per_clu;
|
||
|
|
||
|
exfat_chain_dup(&clu, p_dir);
|
||
|
|
||
|
while (clu.dir != EXFAT_EOF_CLUSTER) {
|
||
|
for (i = 0; i < dentries_per_clu; i++) {
|
||
|
ep = exfat_get_dentry(sb, &clu, i, &bh, NULL);
|
||
|
if (!ep)
|
||
|
return -EIO;
|
||
|
entry_type = exfat_get_entry_type(ep);
|
||
|
brelse(bh);
|
||
|
|
||
|
if (entry_type == TYPE_UNUSED)
|
||
|
return count;
|
||
|
if (entry_type != TYPE_DIR)
|
||
|
continue;
|
||
|
count++;
|
||
|
}
|
||
|
|
||
|
if (clu.flags == ALLOC_NO_FAT_CHAIN) {
|
||
|
if (--clu.size > 0)
|
||
|
clu.dir++;
|
||
|
else
|
||
|
clu.dir = EXFAT_EOF_CLUSTER;
|
||
|
} else {
|
||
|
if (exfat_get_next_cluster(sb, &(clu.dir)))
|
||
|
return -EIO;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return count;
|
||
|
}
|