forked from luck/tmp_suning_uos_patched
419a6e5e82
Both directory formats code the mechanics of fetching the directory buffers using their own implementations. Consolidate these into one implementation. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
126 lines
3.1 KiB
C
126 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#include "adfs.h"
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#include "dir_fplus.h"
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static int adfs_fplus_read(struct super_block *sb, u32 indaddr,
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unsigned int size, 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 int dirsize;
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int ret;
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/* Read first buffer */
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ret = adfs_dir_read_buffers(sb, indaddr, sb->s_blocksize, dir);
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if (ret)
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return ret;
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h = (struct adfs_bigdirheader *)dir->bhs[0]->b_data;
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dirsize = le32_to_cpu(h->bigdirsize);
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if (dirsize != size) {
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adfs_msg(sb, KERN_WARNING,
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"dir %06x header size %X does not match directory size %X",
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indaddr, dirsize, size);
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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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adfs_error(sb, "dir %06x has malformed header", indaddr);
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goto out;
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}
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/* Read remaining buffers */
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ret = adfs_dir_read_buffers(sb, indaddr, dirsize, dir);
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if (ret)
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return ret;
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t = (struct adfs_bigdirtail *)
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(dir->bhs[dir->nr_buffers - 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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adfs_error(sb, "dir %06x has malformed tail", indaddr);
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goto out;
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}
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dir->parent_id = le32_to_cpu(h->bigdirparent);
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return 0;
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out:
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adfs_dir_relse(dir);
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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 =
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(struct adfs_bigdirheader *) dir->bhs[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 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 =
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(struct adfs_bigdirheader *) dir->bhs[0]->b_data;
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struct adfs_bigdirentry bde;
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unsigned int offset;
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int ret;
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if (dir->pos >= le32_to_cpu(h->bigdirentries))
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return -ENOENT;
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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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ret = adfs_dir_copyfrom(&bde, dir, offset,
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sizeof(struct adfs_bigdirentry));
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if (ret)
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return ret;
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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->indaddr = 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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ret = adfs_dir_copyfrom(obj->name, dir, offset, obj->name_len);
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if (ret)
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return ret;
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adfs_object_fixup(dir, obj);
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dir->pos += 1;
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return 0;
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}
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const 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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};
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