patch-2.4.22 linux-2.4.22/fs/hfsplus/dir.c

• Lines: 493
• Date: 2003-08-25 04:44:43.000000000 -0700
• Orig file: linux-2.4.21/fs/hfsplus/dir.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/fs/hfsplus/dir.c linux-2.4.22/fs/hfsplus/dir.c
@@ -0,0 +1,492 @@
+/*
+ *  linux/fs/hfsplus/dir.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Handling of directories
+ */
+
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/version.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
+#include <linux/buffer_head.h>
+#endif
+
+#include "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+
+/* Find the entry inside dir named dentry->d_name */
+static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry)
+{
+	struct inode *inode = NULL;
+	struct hfsplus_find_data fd;
+	struct super_block *sb;
+	hfsplus_cat_entry entry;
+	int err;
+	u32 cnid, linkid = 0;
+	u16 type;
+
+	sb = dir->i_sb;
+	dentry->d_fsdata = NULL;
+	hfsplus_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
+	hfsplus_fill_cat_key(fd.search_key, dir->i_ino, &dentry->d_name);
+again:
+	err = hfsplus_btree_find_entry(&fd, &entry, sizeof(entry));
+	if (err) {
+		if (err == -ENOENT) {
+			hfsplus_find_exit(&fd);
+			/* No such entry */
+			inode = NULL;
+			goto out;
+		}
+		goto fail;
+	}
+	type = be16_to_cpu(entry.type);
+	if (type == HFSPLUS_FOLDER) {
+		if (fd.entrylength < sizeof(hfsplus_cat_folder)) {
+			err = -EIO;
+			goto fail;
+		}
+		cnid = be32_to_cpu(entry.folder.id);
+	} else if (type == HFSPLUS_FILE) {
+		if (fd.entrylength < sizeof(hfsplus_cat_file)) {
+			err = -EIO;
+			goto fail;
+		}
+		cnid = be32_to_cpu(entry.file.id);
+		if (entry.file.user_info.fdType == cpu_to_be32(HFSP_HARDLINK_TYPE) &&
+		    entry.file.user_info.fdCreator == cpu_to_be32(HFSP_HFSPLUS_CREATOR)) {
+			struct qstr str;
+			char name[32];
+
+			if (dentry->d_fsdata) {
+				err = -ENOENT;
+				inode = NULL;
+				goto out;
+			}
+			dentry->d_fsdata = (void *)(unsigned long)cnid;
+			linkid = be32_to_cpu(entry.file.permissions.dev);
+			str.len = sprintf(name, "iNode%d", linkid);
+			str.name = name;
+			hfsplus_fill_cat_key(fd.search_key, HFSPLUS_SB(sb).hidden_dir->i_ino, &str);
+			goto again;
+		} else if (!dentry->d_fsdata)
+			dentry->d_fsdata = (void *)(unsigned long)cnid;
+	} else {
+		printk("HFS+-fs: Illegal catalog entry type in lookup\n");
+		err = -EIO;
+		goto fail;
+	}
+	hfsplus_find_exit(&fd);
+	inode = iget(dir->i_sb, cnid);
+	if (!inode)
+		return ERR_PTR(-EACCES);
+	if (S_ISREG(inode->i_mode))
+		HFSPLUS_I(inode).dev = linkid;
+out:
+	d_add(dentry, inode);
+	return NULL;
+fail:
+	hfsplus_find_exit(&fd);
+	return ERR_PTR(err);
+}
+
+static int hfsplus_readdir(struct file *filp, void *dirent, filldir_t filldir)
+{
+	struct inode *inode = filp->f_dentry->d_inode;
+	struct super_block *sb = inode->i_sb;
+	int len, err;
+	char strbuf[HFSPLUS_MAX_STRLEN + 1];
+	hfsplus_cat_entry entry;
+	struct hfsplus_find_data fd;
+	struct hfsplus_readdir_data *rd;
+	u16 type;
+
+	if (filp->f_pos >= inode->i_size)
+		return 0;
+
+	hfsplus_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
+	hfsplus_fill_cat_key(fd.search_key, inode->i_ino, NULL);
+	err = hfsplus_btree_find(&fd);
+	if (err)
+		goto out;
+
+	switch ((u32)filp->f_pos) {
+	case 0:
+		/* This is completely artificial... */
+		if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR))
+			goto out;
+		filp->f_pos++;
+		/* fall through */
+	case 1:
+		hfsplus_bnode_readbytes(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
+		if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
+			printk("HFS+-fs: bad catalog folder thread\n");
+			err = -EIO;
+			goto out;
+		}
+		if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
+			printk("HFS+-fs: truncated catalog thread\n");
+			err = -EIO;
+			goto out;
+		}
+		if (filldir(dirent, "..", 2, 1,
+			    be32_to_cpu(entry.thread.parentID), DT_DIR))
+			goto out;
+		filp->f_pos++;
+		/* fall through */
+	default:
+		if (filp->f_pos >= inode->i_size)
+			goto out;
+		err = hfsplus_btree_move(&fd, filp->f_pos - 1);
+		if (err)
+			goto out;
+	}
+
+	for (;;) {
+		if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
+			printk("HFS+-fs: walked past end of dir\n");
+			err = -EIO;
+			goto out;
+		}
+		hfsplus_bnode_readbytes(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
+		type = be16_to_cpu(entry.type);
+		len = HFSPLUS_MAX_STRLEN;
+		err = hfsplus_uni2asc(&fd.key->cat.name, strbuf, &len);
+		if (err)
+			goto out;
+		if (type == HFSPLUS_FOLDER) {
+			if (fd.entrylength < sizeof(hfsplus_cat_folder)) {
+				printk("HFS+-fs: small dir entry\n");
+				err = -EIO;
+				goto out;
+			}
+			if (HFSPLUS_SB(sb).hidden_dir &&
+			    HFSPLUS_SB(sb).hidden_dir->i_ino == be32_to_cpu(entry.folder.id))
+				goto next;
+			if (filldir(dirent, strbuf, len, filp->f_pos,
+				    be32_to_cpu(entry.folder.id), DT_DIR))
+				break;
+		} else if (type == HFSPLUS_FILE) {
+			if (fd.entrylength < sizeof(hfsplus_cat_file)) {
+				printk("HFS+-fs: small file entry\n");
+				err = -EIO;
+				goto out;
+			}
+			if (filldir(dirent, strbuf, len, filp->f_pos,
+				    be32_to_cpu(entry.file.id), DT_REG))
+				break;
+		} else {
+			printk("HFS+-fs: bad catalog entry type\n");
+			err = -EIO;
+			goto out;
+		}
+	next:
+		filp->f_pos++;
+		if (filp->f_pos >= inode->i_size)
+			goto out;
+		err = hfsplus_btree_move(&fd, 1);
+		if (err)
+			goto out;
+	}
+	rd = filp->private_data;
+	if (!filp->private_data) {
+		rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL);
+		if (!rd) {
+			err = -ENOMEM;
+			goto out;
+		}
+		filp->private_data = rd;
+		rd->file = filp;
+		list_add(&rd->list, &HFSPLUS_I(inode).open_dir_list);
+	}
+	memcpy(&rd->key, fd.key, sizeof(hfsplus_cat_key));
+out:
+	hfsplus_find_exit(&fd);
+	return err;
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+static loff_t hfsplus_seek_dir(struct file *file, loff_t offset, int origin)
+{
+	loff_t res;
+
+	down(&file->f_dentry->d_inode->i_sem);
+	res = default_llseek(file, offset, origin);
+	up(&file->f_dentry->d_inode->i_sem);
+
+	return res;
+}
+#endif
+
+static int hfsplus_dir_release(struct inode *inode, struct file *file)
+{
+	struct hfsplus_readdir_data *rd = file->private_data;
+	if (rd) {
+		list_del(&rd->list);
+		kfree(rd);
+	}
+	return 0;
+}
+
+int hfsplus_create(struct inode *dir, struct dentry *dentry, int mode)
+{
+	struct inode *inode;
+	int res;
+
+	inode = hfsplus_new_inode(dir->i_sb, mode);
+	if (!inode)
+		return -ENOSPC;
+
+	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
+	if (res) {
+		inode->i_nlink = 0;
+		iput(inode);
+		return res;
+	}
+	dentry->d_fsdata = (void *)inode->i_ino;
+	d_instantiate(dentry, inode);
+	mark_inode_dirty(inode);
+	return 0;
+}
+
+int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir, struct dentry *dst_dentry)
+{
+	struct super_block *sb = dst_dir->i_sb;
+	struct inode *inode = src_dentry->d_inode;
+	struct inode *src_dir = src_dentry->d_parent->d_inode;
+	struct qstr str;
+	char name[32];
+	u32 cnid, id;
+	int res;
+
+	if (HFSPLUS_IS_RSRC(inode))
+		return -EPERM;
+
+	if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {
+		for (;;) {
+			get_random_bytes(&id, sizeof(cnid));
+			id &= 0x3fffffff;
+			str.name = name;
+			str.len = sprintf(name, "iNode%d", id);
+			res = hfsplus_rename_cat(inode->i_ino,
+						 src_dir, &src_dentry->d_name,
+						 HFSPLUS_SB(sb).hidden_dir, &str);
+			if (!res)
+				break;
+			if (res != -EEXIST)
+				return res;
+		}
+		HFSPLUS_I(inode).dev = id;
+		cnid = HFSPLUS_SB(sb).next_cnid++;
+		src_dentry->d_fsdata = (void *)(unsigned long)cnid;
+		res = hfsplus_create_cat(cnid, src_dir, &src_dentry->d_name, inode);
+		if (res)
+			/* panic? */
+			return res;
+		HFSPLUS_SB(sb).file_count++;
+	}
+	cnid = HFSPLUS_SB(sb).next_cnid++;
+	res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
+	if (res)
+		return res;
+
+	inode->i_nlink++;
+	dst_dentry->d_fsdata = (void *)(unsigned long)cnid;
+	d_instantiate(dst_dentry, inode);
+	atomic_inc(&inode->i_count);
+	inode->i_ctime = CURRENT_TIME;
+	mark_inode_dirty(inode);
+	HFSPLUS_SB(sb).file_count++;
+	sb->s_dirt = 1;
+
+	return 0;
+}
+
+int hfsplus_unlink(struct inode *dir, struct dentry *dentry)
+{
+	struct super_block *sb = dir->i_sb;
+	struct inode *inode = dentry->d_inode;
+	struct qstr str;
+	char name[32];
+	u32 cnid;
+	int res;
+
+	if (HFSPLUS_IS_RSRC(inode))
+		return -EPERM;
+
+	cnid = (u32)(unsigned long)dentry->d_fsdata;
+	if (inode->i_ino == cnid &&
+	    atomic_read(&HFSPLUS_I(inode).opencnt)) {
+		str.name = name;
+		str.len = sprintf(name, "temp%lu", inode->i_ino);
+		res = hfsplus_rename_cat(inode->i_ino,
+					 dir, &dentry->d_name,
+					 HFSPLUS_SB(sb).hidden_dir, &str);
+		if (!res)
+			inode->i_flags |= S_DEAD;
+		return res;
+	}
+	res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
+	if (res)
+		return res;
+
+	inode->i_nlink--;
+	hfsplus_delete_inode(inode);
+	if (inode->i_ino != cnid && !inode->i_nlink) {
+		if (!atomic_read(&HFSPLUS_I(inode).opencnt)) {
+			res = hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
+			if (!res)
+				hfsplus_delete_inode(inode);
+		} else
+			inode->i_flags |= S_DEAD;
+	}
+	inode->i_ctime = CURRENT_TIME;
+	mark_inode_dirty(inode);
+
+	return res;
+}
+
+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;
+		iput(inode);
+		return res;
+	}
+	d_instantiate(dentry, inode);
+	mark_inode_dirty(inode);
+	return 0;
+}
+
+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;
+	inode->i_nlink = 0;
+	inode->i_ctime = CURRENT_TIME;
+	hfsplus_delete_inode(inode);
+	mark_inode_dirty(inode);
+	return 0;
+}
+
+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;
+		iput (inode);
+		return res;
+	}
+
+	mark_inode_dirty(inode);
+	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
+
+	if (!res) {
+		d_instantiate(dentry, inode);
+		mark_inode_dirty(inode);
+	}
+
+	return res;
+}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
+int hfsplus_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
+#else
+int hfsplus_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
+#endif
+{
+	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;
+		iput(inode);
+		return res;
+	}
+	init_special_inode(inode, mode, rdev);
+	d_instantiate(dentry, inode);
+	mark_inode_dirty(inode);
+
+	return 0;
+}
+
+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;
+}
+
+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,
+};
+
+struct file_operations hfsplus_dir_operations = {
+	.read		= generic_read_dir,
+	.readdir	= hfsplus_readdir,
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+	.llseek		= hfsplus_seek_dir,
+#else
+	.llseek		= generic_file_llseek,
+#endif
+	.release	= hfsplus_dir_release,
+};