![Linus Torvalds](/assets/img/avatar_default.png)
Pull adfs updates from Al Viro: "More ADFS patches from Russell King" * 'work.adfs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: fs/adfs: add time stamp and file type helpers fs/adfs: super: limit idlen according to directory type fs/adfs: super: fix use-after-free bug fs/adfs: super: safely update options on remount fs/adfs: super: correct superblock flags fs/adfs: clean up indirect disc addresses and fragment IDs fs/adfs: clean up error message printing fs/adfs: use %pV for error messages fs/adfs: use format_version from disc_record fs/adfs: add helper to get filesystem size fs/adfs: add helper to get discrecord from map fs/adfs: correct disc record structure
280 lines
5.9 KiB
C
280 lines
5.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/fs/adfs/dir.c
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*
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* Copyright (C) 1999-2000 Russell King
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*
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* Common directory handling for ADFS
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*/
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#include "adfs.h"
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/*
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* For future. This should probably be per-directory.
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*/
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static DEFINE_RWLOCK(adfs_dir_lock);
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void adfs_object_fixup(struct adfs_dir *dir, struct object_info *obj)
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{
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unsigned int dots, i;
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/*
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* RISC OS allows the use of '/' in directory entry names, so we need
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* to fix these up. '/' is typically used for FAT compatibility to
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* represent '.', so do the same conversion here. In any case, '.'
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* will never be in a RISC OS name since it is used as the pathname
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* separator. Handle the case where we may generate a '.' or '..'
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* name, replacing the first character with '^' (the RISC OS "parent
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* directory" character.)
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*/
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for (i = dots = 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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dots++;
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}
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if (obj->name_len <= 2 && dots == obj->name_len)
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obj->name[0] = '^';
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/*
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* If the object is a file, and the user requested the ,xyz hex
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* filetype suffix to the name, check the filetype and append.
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*/
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if (!(obj->attr & ADFS_NDA_DIRECTORY) && ADFS_SB(dir->sb)->s_ftsuffix) {
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u16 filetype = adfs_filetype(obj->loadaddr);
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if (filetype != ADFS_FILETYPE_NONE) {
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obj->name[obj->name_len++] = ',';
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obj->name[obj->name_len++] = hex_asc_lo(filetype >> 8);
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obj->name[obj->name_len++] = hex_asc_lo(filetype >> 4);
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obj->name[obj->name_len++] = hex_asc_lo(filetype >> 0);
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}
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}
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}
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static int
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adfs_readdir(struct file *file, struct dir_context *ctx)
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{
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struct inode *inode = file_inode(file);
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struct super_block *sb = inode->i_sb;
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const struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir;
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struct object_info obj;
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struct adfs_dir dir;
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int ret = 0;
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if (ctx->pos >> 32)
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return 0;
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ret = ops->read(sb, inode->i_ino, inode->i_size, &dir);
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if (ret)
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return ret;
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if (ctx->pos == 0) {
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if (!dir_emit_dot(file, ctx))
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goto free_out;
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ctx->pos = 1;
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}
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if (ctx->pos == 1) {
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if (!dir_emit(ctx, "..", 2, dir.parent_id, DT_DIR))
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goto free_out;
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ctx->pos = 2;
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}
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read_lock(&adfs_dir_lock);
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ret = ops->setpos(&dir, ctx->pos - 2);
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if (ret)
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goto unlock_out;
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while (ops->getnext(&dir, &obj) == 0) {
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if (!dir_emit(ctx, obj.name, obj.name_len,
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obj.indaddr, DT_UNKNOWN))
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break;
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ctx->pos++;
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}
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unlock_out:
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read_unlock(&adfs_dir_lock);
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free_out:
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ops->free(&dir);
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return ret;
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}
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int
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adfs_dir_update(struct super_block *sb, struct object_info *obj, int wait)
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{
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int ret = -EINVAL;
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#ifdef CONFIG_ADFS_FS_RW
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const struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir;
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struct adfs_dir dir;
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printk(KERN_INFO "adfs_dir_update: object %06x in dir %06x\n",
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obj->indaddr, obj->parent_id);
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if (!ops->update) {
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ret = -EINVAL;
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goto out;
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}
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ret = ops->read(sb, obj->parent_id, 0, &dir);
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if (ret)
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goto out;
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write_lock(&adfs_dir_lock);
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ret = ops->update(&dir, obj);
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write_unlock(&adfs_dir_lock);
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if (wait) {
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int err = ops->sync(&dir);
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if (!ret)
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ret = err;
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}
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ops->free(&dir);
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out:
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#endif
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return ret;
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}
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static unsigned char adfs_tolower(unsigned char c)
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{
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if (c >= 'A' && c <= 'Z')
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c += 'a' - 'A';
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return c;
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}
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static int __adfs_compare(const unsigned char *qstr, u32 qlen,
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const char *str, u32 len)
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{
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u32 i;
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if (qlen != len)
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return 1;
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for (i = 0; i < qlen; i++)
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if (adfs_tolower(qstr[i]) != adfs_tolower(str[i]))
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return 1;
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return 0;
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}
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static int adfs_dir_lookup_byname(struct inode *inode, const struct qstr *qstr,
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struct object_info *obj)
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{
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struct super_block *sb = inode->i_sb;
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const struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir;
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const unsigned char *name;
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struct adfs_dir dir;
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u32 name_len;
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int ret;
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ret = ops->read(sb, inode->i_ino, inode->i_size, &dir);
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if (ret)
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goto out;
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if (ADFS_I(inode)->parent_id != dir.parent_id) {
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adfs_error(sb,
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"parent directory changed under me! (%06x but got %06x)\n",
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ADFS_I(inode)->parent_id, dir.parent_id);
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ret = -EIO;
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goto free_out;
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}
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obj->parent_id = inode->i_ino;
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read_lock(&adfs_dir_lock);
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ret = ops->setpos(&dir, 0);
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if (ret)
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goto unlock_out;
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ret = -ENOENT;
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name = qstr->name;
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name_len = qstr->len;
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while (ops->getnext(&dir, obj) == 0) {
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if (!__adfs_compare(name, name_len, obj->name, obj->name_len)) {
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ret = 0;
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break;
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}
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}
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unlock_out:
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read_unlock(&adfs_dir_lock);
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free_out:
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ops->free(&dir);
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out:
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return ret;
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}
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const struct file_operations adfs_dir_operations = {
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.read = generic_read_dir,
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.llseek = generic_file_llseek,
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.iterate = adfs_readdir,
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.fsync = generic_file_fsync,
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};
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static int
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adfs_hash(const struct dentry *parent, struct qstr *qstr)
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{
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const unsigned char *name;
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unsigned long hash;
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u32 len;
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if (qstr->len > ADFS_SB(parent->d_sb)->s_namelen)
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return -ENAMETOOLONG;
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len = qstr->len;
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name = qstr->name;
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hash = init_name_hash(parent);
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while (len--)
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hash = partial_name_hash(adfs_tolower(*name++), hash);
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qstr->hash = end_name_hash(hash);
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return 0;
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}
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/*
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* Compare two names, taking note of the name length
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* requirements of the underlying filesystem.
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*/
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static int adfs_compare(const struct dentry *dentry, unsigned int len,
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const char *str, const struct qstr *qstr)
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{
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return __adfs_compare(qstr->name, qstr->len, str, len);
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}
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const struct dentry_operations adfs_dentry_operations = {
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.d_hash = adfs_hash,
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.d_compare = adfs_compare,
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};
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static struct dentry *
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adfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
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{
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struct inode *inode = NULL;
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struct object_info obj;
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int error;
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error = adfs_dir_lookup_byname(dir, &dentry->d_name, &obj);
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if (error == 0) {
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/*
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* This only returns NULL if get_empty_inode
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* fails.
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*/
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inode = adfs_iget(dir->i_sb, &obj);
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if (!inode)
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inode = ERR_PTR(-EACCES);
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} else if (error != -ENOENT) {
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inode = ERR_PTR(error);
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}
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return d_splice_alias(inode, dentry);
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}
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/*
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* directories can handle most operations...
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*/
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const struct inode_operations adfs_dir_inode_operations = {
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.lookup = adfs_lookup,
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.setattr = adfs_notify_change,
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};
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