582 строки
14 KiB
C
582 строки
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/hfsplus/dir.c
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*
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* Copyright (C) 2001
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* Brad Boyer (flar@allandria.com)
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* (C) 2003 Ardis Technologies <roman@ardistech.com>
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*
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* Handling of directories
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*/
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/random.h>
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#include <linux/nls.h>
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#include "hfsplus_fs.h"
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#include "hfsplus_raw.h"
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#include "xattr.h"
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static inline void hfsplus_instantiate(struct dentry *dentry,
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struct inode *inode, u32 cnid)
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{
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dentry->d_fsdata = (void *)(unsigned long)cnid;
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d_instantiate(dentry, inode);
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}
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/* Find the entry inside dir named dentry->d_name */
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static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry,
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unsigned int flags)
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{
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struct inode *inode = NULL;
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struct hfs_find_data fd;
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struct super_block *sb;
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hfsplus_cat_entry entry;
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int err;
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u32 cnid, linkid = 0;
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u16 type;
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sb = dir->i_sb;
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dentry->d_fsdata = NULL;
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err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
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if (err)
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return ERR_PTR(err);
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err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino,
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&dentry->d_name);
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if (unlikely(err < 0))
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goto fail;
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again:
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err = hfs_brec_read(&fd, &entry, sizeof(entry));
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if (err) {
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if (err == -ENOENT) {
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hfs_find_exit(&fd);
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/* No such entry */
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inode = NULL;
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goto out;
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}
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goto fail;
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}
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type = be16_to_cpu(entry.type);
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if (type == HFSPLUS_FOLDER) {
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if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
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err = -EIO;
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goto fail;
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}
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cnid = be32_to_cpu(entry.folder.id);
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dentry->d_fsdata = (void *)(unsigned long)cnid;
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} else if (type == HFSPLUS_FILE) {
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if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
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err = -EIO;
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goto fail;
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}
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cnid = be32_to_cpu(entry.file.id);
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if (entry.file.user_info.fdType ==
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cpu_to_be32(HFSP_HARDLINK_TYPE) &&
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entry.file.user_info.fdCreator ==
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cpu_to_be32(HFSP_HFSPLUS_CREATOR) &&
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HFSPLUS_SB(sb)->hidden_dir &&
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(entry.file.create_date ==
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HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)->
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create_date ||
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entry.file.create_date ==
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HFSPLUS_I(d_inode(sb->s_root))->
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create_date)) {
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struct qstr str;
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char name[32];
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if (dentry->d_fsdata) {
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/*
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* We found a link pointing to another link,
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* so ignore it and treat it as regular file.
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*/
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cnid = (unsigned long)dentry->d_fsdata;
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linkid = 0;
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} else {
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dentry->d_fsdata = (void *)(unsigned long)cnid;
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linkid =
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be32_to_cpu(entry.file.permissions.dev);
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str.len = sprintf(name, "iNode%d", linkid);
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str.name = name;
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err = hfsplus_cat_build_key(sb, fd.search_key,
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HFSPLUS_SB(sb)->hidden_dir->i_ino,
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&str);
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if (unlikely(err < 0))
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goto fail;
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goto again;
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}
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} else if (!dentry->d_fsdata)
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dentry->d_fsdata = (void *)(unsigned long)cnid;
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} else {
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pr_err("invalid catalog entry type in lookup\n");
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err = -EIO;
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goto fail;
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}
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hfs_find_exit(&fd);
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inode = hfsplus_iget(dir->i_sb, cnid);
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if (IS_ERR(inode))
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return ERR_CAST(inode);
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if (S_ISREG(inode->i_mode))
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HFSPLUS_I(inode)->linkid = linkid;
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out:
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return d_splice_alias(inode, dentry);
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fail:
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hfs_find_exit(&fd);
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return ERR_PTR(err);
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}
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static int hfsplus_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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int len, err;
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char *strbuf;
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hfsplus_cat_entry entry;
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struct hfs_find_data fd;
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struct hfsplus_readdir_data *rd;
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u16 type;
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if (file->f_pos >= inode->i_size)
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return 0;
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err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
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if (err)
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return err;
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strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN + 1, GFP_KERNEL);
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if (!strbuf) {
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err = -ENOMEM;
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goto out;
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}
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hfsplus_cat_build_key_with_cnid(sb, fd.search_key, inode->i_ino);
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err = hfs_brec_find(&fd, hfs_find_rec_by_key);
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if (err)
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goto out;
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if (ctx->pos == 0) {
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/* This is completely artificial... */
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if (!dir_emit_dot(file, ctx))
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goto 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 (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
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err = -EIO;
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goto out;
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}
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hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
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fd.entrylength);
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if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
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pr_err("bad catalog folder thread\n");
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err = -EIO;
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goto out;
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}
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if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
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pr_err("truncated catalog thread\n");
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err = -EIO;
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goto out;
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}
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if (!dir_emit(ctx, "..", 2,
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be32_to_cpu(entry.thread.parentID), DT_DIR))
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goto out;
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ctx->pos = 2;
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}
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if (ctx->pos >= inode->i_size)
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goto out;
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err = hfs_brec_goto(&fd, ctx->pos - 1);
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if (err)
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goto out;
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for (;;) {
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if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
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pr_err("walked past end of dir\n");
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err = -EIO;
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goto out;
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}
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if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
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err = -EIO;
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goto out;
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}
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hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
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fd.entrylength);
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type = be16_to_cpu(entry.type);
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len = NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN;
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err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len);
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if (err)
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goto out;
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if (type == HFSPLUS_FOLDER) {
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if (fd.entrylength <
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sizeof(struct hfsplus_cat_folder)) {
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pr_err("small dir entry\n");
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err = -EIO;
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goto out;
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}
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if (HFSPLUS_SB(sb)->hidden_dir &&
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HFSPLUS_SB(sb)->hidden_dir->i_ino ==
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be32_to_cpu(entry.folder.id))
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goto next;
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if (!dir_emit(ctx, strbuf, len,
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be32_to_cpu(entry.folder.id), DT_DIR))
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break;
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} else if (type == HFSPLUS_FILE) {
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u16 mode;
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unsigned type = DT_UNKNOWN;
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if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
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pr_err("small file entry\n");
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err = -EIO;
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goto out;
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}
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mode = be16_to_cpu(entry.file.permissions.mode);
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if (S_ISREG(mode))
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type = DT_REG;
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else if (S_ISLNK(mode))
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type = DT_LNK;
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else if (S_ISFIFO(mode))
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type = DT_FIFO;
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else if (S_ISCHR(mode))
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type = DT_CHR;
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else if (S_ISBLK(mode))
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type = DT_BLK;
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else if (S_ISSOCK(mode))
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type = DT_SOCK;
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if (!dir_emit(ctx, strbuf, len,
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be32_to_cpu(entry.file.id), type))
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break;
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} else {
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pr_err("bad catalog entry type\n");
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err = -EIO;
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goto out;
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}
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next:
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ctx->pos++;
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if (ctx->pos >= inode->i_size)
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goto out;
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err = hfs_brec_goto(&fd, 1);
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if (err)
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goto out;
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}
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rd = file->private_data;
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if (!rd) {
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rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL);
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if (!rd) {
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err = -ENOMEM;
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goto out;
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}
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file->private_data = rd;
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rd->file = file;
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spin_lock(&HFSPLUS_I(inode)->open_dir_lock);
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list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list);
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spin_unlock(&HFSPLUS_I(inode)->open_dir_lock);
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}
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/*
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* Can be done after the list insertion; exclusion with
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* hfsplus_delete_cat() is provided by directory lock.
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*/
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memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
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out:
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kfree(strbuf);
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hfs_find_exit(&fd);
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return err;
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}
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static int hfsplus_dir_release(struct inode *inode, struct file *file)
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{
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struct hfsplus_readdir_data *rd = file->private_data;
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if (rd) {
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spin_lock(&HFSPLUS_I(inode)->open_dir_lock);
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list_del(&rd->list);
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spin_unlock(&HFSPLUS_I(inode)->open_dir_lock);
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kfree(rd);
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}
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return 0;
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}
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static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir,
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struct dentry *dst_dentry)
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{
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struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb);
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struct inode *inode = d_inode(src_dentry);
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struct inode *src_dir = d_inode(src_dentry->d_parent);
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struct qstr str;
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char name[32];
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u32 cnid, id;
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int res;
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if (HFSPLUS_IS_RSRC(inode))
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return -EPERM;
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if (!S_ISREG(inode->i_mode))
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return -EPERM;
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mutex_lock(&sbi->vh_mutex);
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if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {
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for (;;) {
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get_random_bytes(&id, sizeof(cnid));
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id &= 0x3fffffff;
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str.name = name;
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str.len = sprintf(name, "iNode%d", id);
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res = hfsplus_rename_cat(inode->i_ino,
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src_dir, &src_dentry->d_name,
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sbi->hidden_dir, &str);
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if (!res)
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break;
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if (res != -EEXIST)
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goto out;
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}
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HFSPLUS_I(inode)->linkid = id;
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cnid = sbi->next_cnid++;
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src_dentry->d_fsdata = (void *)(unsigned long)cnid;
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res = hfsplus_create_cat(cnid, src_dir,
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&src_dentry->d_name, inode);
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if (res)
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/* panic? */
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goto out;
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sbi->file_count++;
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}
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cnid = sbi->next_cnid++;
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res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
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if (res)
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goto out;
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inc_nlink(inode);
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hfsplus_instantiate(dst_dentry, inode, cnid);
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ihold(inode);
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inode->i_ctime = current_time(inode);
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mark_inode_dirty(inode);
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sbi->file_count++;
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hfsplus_mark_mdb_dirty(dst_dir->i_sb);
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out:
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mutex_unlock(&sbi->vh_mutex);
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return res;
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}
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static int hfsplus_unlink(struct inode *dir, struct dentry *dentry)
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{
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struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
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struct inode *inode = d_inode(dentry);
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struct qstr str;
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char name[32];
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u32 cnid;
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int res;
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if (HFSPLUS_IS_RSRC(inode))
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return -EPERM;
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mutex_lock(&sbi->vh_mutex);
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cnid = (u32)(unsigned long)dentry->d_fsdata;
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if (inode->i_ino == cnid &&
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atomic_read(&HFSPLUS_I(inode)->opencnt)) {
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str.name = name;
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str.len = sprintf(name, "temp%lu", inode->i_ino);
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res = hfsplus_rename_cat(inode->i_ino,
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dir, &dentry->d_name,
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sbi->hidden_dir, &str);
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if (!res) {
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inode->i_flags |= S_DEAD;
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drop_nlink(inode);
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}
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goto out;
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}
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res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
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if (res)
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goto out;
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if (inode->i_nlink > 0)
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drop_nlink(inode);
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if (inode->i_ino == cnid)
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clear_nlink(inode);
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if (!inode->i_nlink) {
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if (inode->i_ino != cnid) {
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sbi->file_count--;
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if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) {
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res = hfsplus_delete_cat(inode->i_ino,
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sbi->hidden_dir,
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NULL);
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if (!res)
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hfsplus_delete_inode(inode);
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} else
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inode->i_flags |= S_DEAD;
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} else
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hfsplus_delete_inode(inode);
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} else
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sbi->file_count--;
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inode->i_ctime = current_time(inode);
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mark_inode_dirty(inode);
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out:
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mutex_unlock(&sbi->vh_mutex);
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return res;
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}
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static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry)
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{
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struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
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struct inode *inode = d_inode(dentry);
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int res;
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if (inode->i_size != 2)
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return -ENOTEMPTY;
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mutex_lock(&sbi->vh_mutex);
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res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
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if (res)
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goto out;
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clear_nlink(inode);
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inode->i_ctime = current_time(inode);
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hfsplus_delete_inode(inode);
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mark_inode_dirty(inode);
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out:
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mutex_unlock(&sbi->vh_mutex);
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return res;
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}
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static int hfsplus_symlink(struct user_namespace *mnt_userns, struct inode *dir,
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struct dentry *dentry, const char *symname)
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{
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struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
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struct inode *inode;
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int res = -ENOMEM;
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mutex_lock(&sbi->vh_mutex);
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inode = hfsplus_new_inode(dir->i_sb, dir, S_IFLNK | S_IRWXUGO);
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if (!inode)
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goto out;
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res = page_symlink(inode, symname, strlen(symname) + 1);
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if (res)
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goto out_err;
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res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
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if (res)
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goto out_err;
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res = hfsplus_init_security(inode, dir, &dentry->d_name);
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if (res == -EOPNOTSUPP)
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res = 0; /* Operation is not supported. */
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else if (res) {
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/* Try to delete anyway without error analysis. */
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hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
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goto out_err;
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}
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hfsplus_instantiate(dentry, inode, inode->i_ino);
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mark_inode_dirty(inode);
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goto out;
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out_err:
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clear_nlink(inode);
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hfsplus_delete_inode(inode);
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iput(inode);
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out:
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mutex_unlock(&sbi->vh_mutex);
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return res;
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}
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static int hfsplus_mknod(struct user_namespace *mnt_userns, struct inode *dir,
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struct dentry *dentry, umode_t mode, dev_t rdev)
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{
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struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
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struct inode *inode;
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int res = -ENOMEM;
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mutex_lock(&sbi->vh_mutex);
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inode = hfsplus_new_inode(dir->i_sb, dir, mode);
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if (!inode)
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goto out;
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if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode))
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init_special_inode(inode, mode, rdev);
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res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
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if (res)
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goto failed_mknod;
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|
|
res = hfsplus_init_security(inode, dir, &dentry->d_name);
|
|
if (res == -EOPNOTSUPP)
|
|
res = 0; /* Operation is not supported. */
|
|
else if (res) {
|
|
/* Try to delete anyway without error analysis. */
|
|
hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
|
|
goto failed_mknod;
|
|
}
|
|
|
|
hfsplus_instantiate(dentry, inode, inode->i_ino);
|
|
mark_inode_dirty(inode);
|
|
goto out;
|
|
|
|
failed_mknod:
|
|
clear_nlink(inode);
|
|
hfsplus_delete_inode(inode);
|
|
iput(inode);
|
|
out:
|
|
mutex_unlock(&sbi->vh_mutex);
|
|
return res;
|
|
}
|
|
|
|
static int hfsplus_create(struct user_namespace *mnt_userns, struct inode *dir,
|
|
struct dentry *dentry, umode_t mode, bool excl)
|
|
{
|
|
return hfsplus_mknod(&init_user_ns, dir, dentry, mode, 0);
|
|
}
|
|
|
|
static int hfsplus_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
|
|
struct dentry *dentry, umode_t mode)
|
|
{
|
|
return hfsplus_mknod(&init_user_ns, dir, dentry, mode | S_IFDIR, 0);
|
|
}
|
|
|
|
static int hfsplus_rename(struct user_namespace *mnt_userns,
|
|
struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry,
|
|
unsigned int flags)
|
|
{
|
|
int res;
|
|
|
|
if (flags & ~RENAME_NOREPLACE)
|
|
return -EINVAL;
|
|
|
|
/* Unlink destination if it already exists */
|
|
if (d_really_is_positive(new_dentry)) {
|
|
if (d_is_dir(new_dentry))
|
|
res = hfsplus_rmdir(new_dir, new_dentry);
|
|
else
|
|
res = hfsplus_unlink(new_dir, new_dentry);
|
|
if (res)
|
|
return res;
|
|
}
|
|
|
|
res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata,
|
|
old_dir, &old_dentry->d_name,
|
|
new_dir, &new_dentry->d_name);
|
|
if (!res)
|
|
new_dentry->d_fsdata = old_dentry->d_fsdata;
|
|
return res;
|
|
}
|
|
|
|
const struct inode_operations hfsplus_dir_inode_operations = {
|
|
.lookup = hfsplus_lookup,
|
|
.create = hfsplus_create,
|
|
.link = hfsplus_link,
|
|
.unlink = hfsplus_unlink,
|
|
.mkdir = hfsplus_mkdir,
|
|
.rmdir = hfsplus_rmdir,
|
|
.symlink = hfsplus_symlink,
|
|
.mknod = hfsplus_mknod,
|
|
.rename = hfsplus_rename,
|
|
.getattr = hfsplus_getattr,
|
|
.listxattr = hfsplus_listxattr,
|
|
};
|
|
|
|
const struct file_operations hfsplus_dir_operations = {
|
|
.fsync = hfsplus_file_fsync,
|
|
.read = generic_read_dir,
|
|
.iterate_shared = hfsplus_readdir,
|
|
.unlocked_ioctl = hfsplus_ioctl,
|
|
.llseek = generic_file_llseek,
|
|
.release = hfsplus_dir_release,
|
|
};
|