501 lines
12 KiB
C
501 lines
12 KiB
C
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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 "hfsplus_fs.h"
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#include "hfsplus_raw.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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struct nameidata *nd)
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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_op = &hfsplus_dentry_operations;
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dentry->d_fsdata = NULL;
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hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
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hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, &dentry->d_name);
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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 == cpu_to_be32(HFSP_HARDLINK_TYPE) &&
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entry.file.user_info.fdCreator == cpu_to_be32(HFSP_HFSPLUS_CREATOR) &&
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(entry.file.create_date == HFSPLUS_I(HFSPLUS_SB(sb).hidden_dir).create_date ||
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entry.file.create_date == HFSPLUS_I(sb->s_root->d_inode).create_date) &&
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HFSPLUS_SB(sb).hidden_dir) {
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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 = 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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hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_SB(sb).hidden_dir->i_ino, &str);
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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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printk(KERN_ERR "hfs: 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).dev = linkid;
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out:
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d_add(dentry, inode);
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return NULL;
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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 *filp, void *dirent, filldir_t filldir)
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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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int len, err;
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char strbuf[HFSPLUS_MAX_STRLEN + 1];
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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 (filp->f_pos >= inode->i_size)
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return 0;
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hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
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hfsplus_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
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err = hfs_brec_find(&fd);
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if (err)
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goto out;
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switch ((u32)filp->f_pos) {
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case 0:
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/* This is completely artificial... */
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if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR))
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goto out;
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filp->f_pos++;
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/* fall through */
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case 1:
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hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
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if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
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printk(KERN_ERR "hfs: 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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printk(KERN_ERR "hfs: 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 (filldir(dirent, "..", 2, 1,
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be32_to_cpu(entry.thread.parentID), DT_DIR))
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goto out;
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filp->f_pos++;
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/* fall through */
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default:
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if (filp->f_pos >= inode->i_size)
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goto out;
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err = hfs_brec_goto(&fd, filp->f_pos - 1);
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if (err)
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goto out;
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}
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for (;;) {
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if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
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printk(KERN_ERR "hfs: 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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hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
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type = be16_to_cpu(entry.type);
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len = 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 < sizeof(struct hfsplus_cat_folder)) {
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printk(KERN_ERR "hfs: 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 == be32_to_cpu(entry.folder.id))
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goto next;
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if (filldir(dirent, strbuf, len, filp->f_pos,
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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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if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
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printk(KERN_ERR "hfs: small file entry\n");
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err = -EIO;
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goto out;
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}
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if (filldir(dirent, strbuf, len, filp->f_pos,
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be32_to_cpu(entry.file.id), DT_REG))
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break;
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} else {
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printk(KERN_ERR "hfs: 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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filp->f_pos++;
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if (filp->f_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 = filp->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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filp->private_data = rd;
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rd->file = filp;
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list_add(&rd->list, &HFSPLUS_I(inode).open_dir_list);
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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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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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list_del(&rd->list);
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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_create(struct inode *dir, struct dentry *dentry, int mode,
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struct nameidata *nd)
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{
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struct inode *inode;
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int res;
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inode = hfsplus_new_inode(dir->i_sb, mode);
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if (!inode)
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return -ENOSPC;
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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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inode->i_nlink = 0;
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hfsplus_delete_inode(inode);
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iput(inode);
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return res;
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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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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 super_block *sb = dst_dir->i_sb;
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struct inode *inode = src_dentry->d_inode;
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struct inode *src_dir = src_dentry->d_parent->d_inode;
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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 (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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HFSPLUS_SB(sb).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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return res;
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}
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HFSPLUS_I(inode).dev = id;
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cnid = HFSPLUS_SB(sb).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, &src_dentry->d_name, inode);
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if (res)
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/* panic? */
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return res;
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HFSPLUS_SB(sb).file_count++;
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}
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cnid = HFSPLUS_SB(sb).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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return res;
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inc_nlink(inode);
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hfsplus_instantiate(dst_dentry, inode, cnid);
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atomic_inc(&inode->i_count);
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inode->i_ctime = CURRENT_TIME_SEC;
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mark_inode_dirty(inode);
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HFSPLUS_SB(sb).file_count++;
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sb->s_dirt = 1;
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return 0;
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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 super_block *sb = dir->i_sb;
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struct inode *inode = dentry->d_inode;
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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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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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HFSPLUS_SB(sb).hidden_dir, &str);
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if (!res)
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inode->i_flags |= S_DEAD;
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return res;
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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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return res;
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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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HFSPLUS_SB(sb).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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HFSPLUS_SB(sb).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;
|
||
|
|
} else
|
||
|
|
hfsplus_delete_inode(inode);
|
||
|
|
} else
|
||
|
|
HFSPLUS_SB(sb).file_count--;
|
||
|
|
inode->i_ctime = CURRENT_TIME_SEC;
|
||
|
|
mark_inode_dirty(inode);
|
||
|
|
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, int mode)
|
||
|
|
{
|
||
|
|
struct inode *inode;
|
||
|
|
int res;
|
||
|
|
|
||
|
|
inode = hfsplus_new_inode(dir->i_sb, S_IFDIR | mode);
|
||
|
|
if (!inode)
|
||
|
|
return -ENOSPC;
|
||
|
|
|
||
|
|
res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
|
||
|
|
if (res) {
|
||
|
|
inode->i_nlink = 0;
|
||
|
|
hfsplus_delete_inode(inode);
|
||
|
|
iput(inode);
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
hfsplus_instantiate(dentry, inode, inode->i_ino);
|
||
|
|
mark_inode_dirty(inode);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry)
|
||
|
|
{
|
||
|
|
struct inode *inode;
|
||
|
|
int res;
|
||
|
|
|
||
|
|
inode = dentry->d_inode;
|
||
|
|
if (inode->i_size != 2)
|
||
|
|
return -ENOTEMPTY;
|
||
|
|
res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
|
||
|
|
if (res)
|
||
|
|
return res;
|
||
|
|
clear_nlink(inode);
|
||
|
|
inode->i_ctime = CURRENT_TIME_SEC;
|
||
|
|
hfsplus_delete_inode(inode);
|
||
|
|
mark_inode_dirty(inode);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int hfsplus_symlink(struct inode *dir, struct dentry *dentry,
|
||
|
|
const char *symname)
|
||
|
|
{
|
||
|
|
struct super_block *sb;
|
||
|
|
struct inode *inode;
|
||
|
|
int res;
|
||
|
|
|
||
|
|
sb = dir->i_sb;
|
||
|
|
inode = hfsplus_new_inode(sb, S_IFLNK | S_IRWXUGO);
|
||
|
|
if (!inode)
|
||
|
|
return -ENOSPC;
|
||
|
|
|
||
|
|
res = page_symlink(inode, symname, strlen(symname) + 1);
|
||
|
|
if (res) {
|
||
|
|
inode->i_nlink = 0;
|
||
|
|
hfsplus_delete_inode(inode);
|
||
|
|
iput(inode);
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
|
||
|
|
mark_inode_dirty(inode);
|
||
|
|
res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
|
||
|
|
|
||
|
|
if (!res) {
|
||
|
|
hfsplus_instantiate(dentry, inode, inode->i_ino);
|
||
|
|
mark_inode_dirty(inode);
|
||
|
|
}
|
||
|
|
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int hfsplus_mknod(struct inode *dir, struct dentry *dentry,
|
||
|
|
int mode, dev_t rdev)
|
||
|
|
{
|
||
|
|
struct super_block *sb;
|
||
|
|
struct inode *inode;
|
||
|
|
int res;
|
||
|
|
|
||
|
|
sb = dir->i_sb;
|
||
|
|
inode = hfsplus_new_inode(sb, mode);
|
||
|
|
if (!inode)
|
||
|
|
return -ENOSPC;
|
||
|
|
|
||
|
|
res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
|
||
|
|
if (res) {
|
||
|
|
inode->i_nlink = 0;
|
||
|
|
hfsplus_delete_inode(inode);
|
||
|
|
iput(inode);
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
init_special_inode(inode, mode, rdev);
|
||
|
|
hfsplus_instantiate(dentry, inode, inode->i_ino);
|
||
|
|
mark_inode_dirty(inode);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int hfsplus_rename(struct inode *old_dir, struct dentry *old_dentry,
|
||
|
|
struct inode *new_dir, struct dentry *new_dentry)
|
||
|
|
{
|
||
|
|
int res;
|
||
|
|
|
||
|
|
/* Unlink destination if it already exists */
|
||
|
|
if (new_dentry->d_inode) {
|
||
|
|
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,
|
||
|
|
};
|
||
|
|
|
||
|
|
const struct file_operations hfsplus_dir_operations = {
|
||
|
|
.read = generic_read_dir,
|
||
|
|
.readdir = hfsplus_readdir,
|
||
|
|
.ioctl = hfsplus_ioctl,
|
||
|
|
.llseek = generic_file_llseek,
|
||
|
|
.release = hfsplus_dir_release,
|
||
|
|
};
|