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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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188 lines
4.5 KiB
C
188 lines
4.5 KiB
C
/*
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* linux/fs/adfs/dir_fplus.c
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*
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* Copyright (C) 1997-1999 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/buffer_head.h>
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#include "adfs.h"
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#include "dir_fplus.h"
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static int
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adfs_fplus_read(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir)
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{
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struct adfs_bigdirheader *h;
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struct adfs_bigdirtail *t;
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unsigned long block;
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unsigned int blk, size;
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int i, ret = -EIO;
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dir->nr_buffers = 0;
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block = __adfs_block_map(sb, id, 0);
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if (!block) {
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adfs_error(sb, "dir object %X has a hole at offset 0", id);
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goto out;
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}
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dir->bh[0] = sb_bread(sb, block);
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if (!dir->bh[0])
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goto out;
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dir->nr_buffers += 1;
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h = (struct adfs_bigdirheader *)dir->bh[0]->b_data;
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size = le32_to_cpu(h->bigdirsize);
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if (size != sz) {
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printk(KERN_WARNING "adfs: adfs_fplus_read: directory header size\n"
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" does not match directory size\n");
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}
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if (h->bigdirversion[0] != 0 || h->bigdirversion[1] != 0 ||
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h->bigdirversion[2] != 0 || size & 2047 ||
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h->bigdirstartname != cpu_to_le32(BIGDIRSTARTNAME))
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goto out;
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size >>= sb->s_blocksize_bits;
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for (blk = 1; blk < size; blk++) {
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block = __adfs_block_map(sb, id, blk);
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if (!block) {
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adfs_error(sb, "dir object %X has a hole at offset %d", id, blk);
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goto out;
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}
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dir->bh[blk] = sb_bread(sb, block);
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if (!dir->bh[blk])
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goto out;
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dir->nr_buffers = blk;
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}
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t = (struct adfs_bigdirtail *)(dir->bh[size - 1]->b_data + (sb->s_blocksize - 8));
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if (t->bigdirendname != cpu_to_le32(BIGDIRENDNAME) ||
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t->bigdirendmasseq != h->startmasseq ||
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t->reserved[0] != 0 || t->reserved[1] != 0)
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goto out;
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dir->parent_id = le32_to_cpu(h->bigdirparent);
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dir->sb = sb;
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return 0;
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out:
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for (i = 0; i < dir->nr_buffers; i++)
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brelse(dir->bh[i]);
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dir->sb = NULL;
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return ret;
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}
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static int
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adfs_fplus_setpos(struct adfs_dir *dir, unsigned int fpos)
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{
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struct adfs_bigdirheader *h = (struct adfs_bigdirheader *)dir->bh[0]->b_data;
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int ret = -ENOENT;
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if (fpos <= le32_to_cpu(h->bigdirentries)) {
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dir->pos = fpos;
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ret = 0;
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}
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return ret;
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}
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static void
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dir_memcpy(struct adfs_dir *dir, unsigned int offset, void *to, int len)
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{
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struct super_block *sb = dir->sb;
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unsigned int buffer, partial, remainder;
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buffer = offset >> sb->s_blocksize_bits;
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offset &= sb->s_blocksize - 1;
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partial = sb->s_blocksize - offset;
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if (partial >= len)
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memcpy(to, dir->bh[buffer]->b_data + offset, len);
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else {
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char *c = (char *)to;
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remainder = len - partial;
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memcpy(c, dir->bh[buffer]->b_data + offset, partial);
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memcpy(c + partial, dir->bh[buffer + 1]->b_data, remainder);
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}
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}
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static int
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adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj)
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{
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struct adfs_bigdirheader *h = (struct adfs_bigdirheader *)dir->bh[0]->b_data;
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struct adfs_bigdirentry bde;
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unsigned int offset;
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int i, ret = -ENOENT;
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if (dir->pos >= le32_to_cpu(h->bigdirentries))
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goto out;
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offset = offsetof(struct adfs_bigdirheader, bigdirname);
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offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);
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offset += dir->pos * sizeof(struct adfs_bigdirentry);
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dir_memcpy(dir, offset, &bde, sizeof(struct adfs_bigdirentry));
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obj->loadaddr = le32_to_cpu(bde.bigdirload);
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obj->execaddr = le32_to_cpu(bde.bigdirexec);
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obj->size = le32_to_cpu(bde.bigdirlen);
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obj->file_id = le32_to_cpu(bde.bigdirindaddr);
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obj->attr = le32_to_cpu(bde.bigdirattr);
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obj->name_len = le32_to_cpu(bde.bigdirobnamelen);
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offset = offsetof(struct adfs_bigdirheader, bigdirname);
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offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);
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offset += le32_to_cpu(h->bigdirentries) * sizeof(struct adfs_bigdirentry);
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offset += le32_to_cpu(bde.bigdirobnameptr);
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dir_memcpy(dir, offset, obj->name, obj->name_len);
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for (i = 0; i < obj->name_len; i++)
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if (obj->name[i] == '/')
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obj->name[i] = '.';
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dir->pos += 1;
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ret = 0;
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out:
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return ret;
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}
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static int
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adfs_fplus_sync(struct adfs_dir *dir)
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{
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int err = 0;
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int i;
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for (i = dir->nr_buffers - 1; i >= 0; i--) {
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struct buffer_head *bh = dir->bh[i];
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sync_dirty_buffer(bh);
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if (buffer_req(bh) && !buffer_uptodate(bh))
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err = -EIO;
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}
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return err;
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}
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static void
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adfs_fplus_free(struct adfs_dir *dir)
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{
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int i;
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for (i = 0; i < dir->nr_buffers; i++)
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brelse(dir->bh[i]);
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dir->sb = NULL;
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}
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struct adfs_dir_ops adfs_fplus_dir_ops = {
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.read = adfs_fplus_read,
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.setpos = adfs_fplus_setpos,
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.getnext = adfs_fplus_getnext,
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.sync = adfs_fplus_sync,
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.free = adfs_fplus_free
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};
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