[linux.git] / fs / hfsplus / dir.c

/*
 *  linux/fs/hfsplus/dir.c
 *
 * Copyright (C) 2001
 * Brad Boyer ([email protected])
 * (C) 2003 Ardis Technologies <[email protected]>
 *
 * Handling of directories
 */

#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/nls.h>

#include "hfsplus_fs.h"
#include "hfsplus_raw.h"
#include "xattr.h"
#include "acl.h"

static inline void hfsplus_instantiate(struct dentry *dentry,
				       struct inode *inode, u32 cnid)
{
	dentry->d_fsdata = (void *)(unsigned long)cnid;
	d_instantiate(dentry, inode);
}

/* Find the entry inside dir named dentry->d_name */
static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry,
				     unsigned int flags)
{
	struct inode *inode = NULL;
	struct hfs_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;
	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
	if (err)
		return ERR_PTR(err);
	err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino,
			&dentry->d_name);
	if (unlikely(err < 0))
		goto fail;
again:
	err = hfs_brec_read(&fd, &entry, sizeof(entry));
	if (err) {
		if (err == -ENOENT) {
			hfs_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(struct hfsplus_cat_folder)) {
			err = -EIO;
			goto fail;
		}
		cnid = be32_to_cpu(entry.folder.id);
		dentry->d_fsdata = (void *)(unsigned long)cnid;
	} else if (type == HFSPLUS_FILE) {
		if (fd.entrylength < sizeof(struct 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) &&
				(entry.file.create_date ==
					HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)->
						create_date ||
				entry.file.create_date ==
					HFSPLUS_I(d_inode(sb->s_root))->
						create_date) &&
				HFSPLUS_SB(sb)->hidden_dir) {
			struct qstr str;
			char name[32];

			if (dentry->d_fsdata) {
				/*
				 * We found a link pointing to another link,
				 * so ignore it and treat it as regular file.
				 */
				cnid = (unsigned long)dentry->d_fsdata;
				linkid = 0;
			} else {
				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;
				err = hfsplus_cat_build_key(sb, fd.search_key,
					HFSPLUS_SB(sb)->hidden_dir->i_ino,
					&str);
				if (unlikely(err < 0))
					goto fail;
				goto again;
			}
		} else if (!dentry->d_fsdata)
			dentry->d_fsdata = (void *)(unsigned long)cnid;
	} else {
		pr_err("invalid catalog entry type in lookup\n");
		err = -EIO;
		goto fail;
	}
	hfs_find_exit(&fd);
	inode = hfsplus_iget(dir->i_sb, cnid);
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (S_ISREG(inode->i_mode))
		HFSPLUS_I(inode)->linkid = linkid;
out:
	d_add(dentry, inode);
	return NULL;
fail:
	hfs_find_exit(&fd);
	return ERR_PTR(err);
}

static int hfsplus_readdir(struct file *file, struct dir_context *ctx)
{
	struct inode *inode = file_inode(file);
	struct super_block *sb = inode->i_sb;
	int len, err;
	char *strbuf;
	hfsplus_cat_entry entry;
	struct hfs_find_data fd;
	struct hfsplus_readdir_data *rd;
	u16 type;

	if (file->f_pos >= inode->i_size)
		return 0;

	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
	if (err)
		return err;
	strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN + 1, GFP_KERNEL);
	if (!strbuf) {
		err = -ENOMEM;
		goto out;
	}
	hfsplus_cat_build_key_with_cnid(sb, fd.search_key, inode->i_ino);
	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
	if (err)
		goto out;

	if (ctx->pos == 0) {
		/* This is completely artificial... */
		if (!dir_emit_dot(file, ctx))
			goto out;
		ctx->pos = 1;
	}
	if (ctx->pos == 1) {
		if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
			err = -EIO;
			goto out;
		}

		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
			fd.entrylength);
		if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
			pr_err("bad catalog folder thread\n");
			err = -EIO;
			goto out;
		}
		if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
			pr_err("truncated catalog thread\n");
			err = -EIO;
			goto out;
		}
		if (!dir_emit(ctx, "..", 2,
			    be32_to_cpu(entry.thread.parentID), DT_DIR))
			goto out;
		ctx->pos = 2;
	}
	if (ctx->pos >= inode->i_size)
		goto out;
	err = hfs_brec_goto(&fd, ctx->pos - 1);
	if (err)
		goto out;
	for (;;) {
		if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
			pr_err("walked past end of dir\n");
			err = -EIO;
			goto out;
		}

		if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
			err = -EIO;
			goto out;
		}

		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
			fd.entrylength);
		type = be16_to_cpu(entry.type);
		len = NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN;
		err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len);
		if (err)
			goto out;
		if (type == HFSPLUS_FOLDER) {
			if (fd.entrylength <
					sizeof(struct hfsplus_cat_folder)) {
				pr_err("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 (!dir_emit(ctx, strbuf, len,
				    be32_to_cpu(entry.folder.id), DT_DIR))
				break;
		} else if (type == HFSPLUS_FILE) {
			u16 mode;
			unsigned type = DT_UNKNOWN;

			if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
				pr_err("small file entry\n");
				err = -EIO;
				goto out;
			}

			mode = be16_to_cpu(entry.file.permissions.mode);
			if (S_ISREG(mode))
				type = DT_REG;
			else if (S_ISLNK(mode))
				type = DT_LNK;
			else if (S_ISFIFO(mode))
				type = DT_FIFO;
			else if (S_ISCHR(mode))
				type = DT_CHR;
			else if (S_ISBLK(mode))
				type = DT_BLK;
			else if (S_ISSOCK(mode))
				type = DT_SOCK;

			if (!dir_emit(ctx, strbuf, len,
				      be32_to_cpu(entry.file.id), type))
				break;
		} else {
			pr_err("bad catalog entry type\n");
			err = -EIO;
			goto out;
		}
next:
		ctx->pos++;
		if (ctx->pos >= inode->i_size)
			goto out;
		err = hfs_brec_goto(&fd, 1);
		if (err)
			goto out;
	}
	rd = file->private_data;
	if (!rd) {
		rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL);
		if (!rd) {
			err = -ENOMEM;
			goto out;
		}
		file->private_data = rd;
		rd->file = file;
		spin_lock(&HFSPLUS_I(inode)->open_dir_lock);
		list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list);
		spin_unlock(&HFSPLUS_I(inode)->open_dir_lock);
	}
	/*
	 * Can be done after the list insertion; exclusion with
	 * hfsplus_delete_cat() is provided by directory lock.
	 */
	memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
out:
	kfree(strbuf);
	hfs_find_exit(&fd);
	return err;
}

static int hfsplus_dir_release(struct inode *inode, struct file *file)
{
	struct hfsplus_readdir_data *rd = file->private_data;
	if (rd) {
		spin_lock(&HFSPLUS_I(inode)->open_dir_lock);
		list_del(&rd->list);
		spin_unlock(&HFSPLUS_I(inode)->open_dir_lock);
		kfree(rd);
	}
	return 0;
}

static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir,
			struct dentry *dst_dentry)
{
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb);
	struct inode *inode = d_inode(src_dentry);
	struct inode *src_dir = d_inode(src_dentry->d_parent);
	struct qstr str;
	char name[32];
	u32 cnid, id;
	int res;

	if (HFSPLUS_IS_RSRC(inode))
		return -EPERM;
	if (!S_ISREG(inode->i_mode))
		return -EPERM;

	mutex_lock(&sbi->vh_mutex);
	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,
						 sbi->hidden_dir, &str);
			if (!res)
				break;
			if (res != -EEXIST)
				goto out;
		}
		HFSPLUS_I(inode)->linkid = id;
		cnid = sbi->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? */
			goto out;
		sbi->file_count++;
	}
	cnid = sbi->next_cnid++;
	res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
	if (res)
		goto out;

	inc_nlink(inode);
	hfsplus_instantiate(dst_dentry, inode, cnid);
	ihold(inode);
	inode->i_ctime = current_time(inode);
	mark_inode_dirty(inode);
	sbi->file_count++;
	hfsplus_mark_mdb_dirty(dst_dir->i_sb);
out:
	mutex_unlock(&sbi->vh_mutex);
	return res;
}

static int hfsplus_unlink(struct inode *dir, struct dentry *dentry)
{
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
	struct inode *inode = d_inode(dentry);
	struct qstr str;
	char name[32];
	u32 cnid;
	int res;

	if (HFSPLUS_IS_RSRC(inode))
		return -EPERM;

	mutex_lock(&sbi->vh_mutex);
	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,
					 sbi->hidden_dir, &str);
		if (!res) {
			inode->i_flags |= S_DEAD;
			drop_nlink(inode);
		}
		goto out;
	}
	res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
	if (res)
		goto out;

	if (inode->i_nlink > 0)
		drop_nlink(inode);
	if (inode->i_ino == cnid)
		clear_nlink(inode);
	if (!inode->i_nlink) {
		if (inode->i_ino != cnid) {
			sbi->file_count--;
			if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) {
				res = hfsplus_delete_cat(inode->i_ino,
							 sbi->hidden_dir,
							 NULL);
				if (!res)
					hfsplus_delete_inode(inode);
			} else
				inode->i_flags |= S_DEAD;
		} else
			hfsplus_delete_inode(inode);
	} else
		sbi->file_count--;
	inode->i_ctime = current_time(inode);
	mark_inode_dirty(inode);
out:
	mutex_unlock(&sbi->vh_mutex);
	return res;
}

static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry)
{
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
	struct inode *inode = d_inode(dentry);
	int res;

	if (inode->i_size != 2)
		return -ENOTEMPTY;

	mutex_lock(&sbi->vh_mutex);
	res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
	if (res)
		goto out;
	clear_nlink(inode);
	inode->i_ctime = current_time(inode);
	hfsplus_delete_inode(inode);
	mark_inode_dirty(inode);
out:
	mutex_unlock(&sbi->vh_mutex);
	return res;
}

static int hfsplus_symlink(struct inode *dir, struct dentry *dentry,
			   const char *symname)
{
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
	struct inode *inode;
	int res = -ENOMEM;

	mutex_lock(&sbi->vh_mutex);
	inode = hfsplus_new_inode(dir->i_sb, S_IFLNK | S_IRWXUGO);
	if (!inode)
		goto out;

	res = page_symlink(inode, symname, strlen(symname) + 1);
	if (res)
		goto out_err;

	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
	if (res)
		goto out_err;

	res = hfsplus_init_inode_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 out_err;
	}

	hfsplus_instantiate(dentry, inode, inode->i_ino);
	mark_inode_dirty(inode);
	goto out;

out_err:
	clear_nlink(inode);
	hfsplus_delete_inode(inode);
	iput(inode);
out:
	mutex_unlock(&sbi->vh_mutex);
	return res;
}

static int hfsplus_mknod(struct inode *dir, struct dentry *dentry,
			 umode_t mode, dev_t rdev)
{
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
	struct inode *inode;
	int res = -ENOMEM;

	mutex_lock(&sbi->vh_mutex);
	inode = hfsplus_new_inode(dir->i_sb, mode);
	if (!inode)
		goto out;

	if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode))
		init_special_inode(inode, mode, rdev);

	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
	if (res)
		goto failed_mknod;

	res = hfsplus_init_inode_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 inode *dir, struct dentry *dentry, umode_t mode,
			  bool excl)
{
	return hfsplus_mknod(dir, dentry, mode, 0);
}

static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
	return hfsplus_mknod(dir, dentry, mode | S_IFDIR, 0);
}

static int hfsplus_rename(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,
	.listxattr		= hfsplus_listxattr,
#ifdef CONFIG_HFSPLUS_FS_POSIX_ACL
	.get_acl		= hfsplus_get_posix_acl,
	.set_acl		= hfsplus_set_posix_acl,
#endif
};

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,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/hfsplus/dir.c
	3	*
	4	* Copyright (C) 2001
	5	* Brad Boyer ([email protected])
	6	* (C) 2003 Ardis Technologies <[email protected]>
	7	*
	8	* Handling of directories
	9	*/
	10
	11	#include <linux/errno.h>
	12	#include <linux/fs.h>
1da177e4 LT	13	#include <linux/slab.h>
1da177e4 LT	14	#include <linux/random.h>
017f8da4	15	#include <linux/nls.h>
1da177e4 LT	16
	17	#include "hfsplus_fs.h"
	18	#include "hfsplus_raw.h"
324ef39a	19	#include "xattr.h"
b4c1107c	20	#include "acl.h"
1da177e4 LT	21
	22	static inline void hfsplus_instantiate(struct dentry *dentry,
	23	struct inode *inode, u32 cnid)
	24	{
	25	dentry->d_fsdata = (void *)(unsigned long)cnid;
	26	d_instantiate(dentry, inode);
	27	}
	28
	29	/* Find the entry inside dir named dentry->d_name */
	30	static struct dentry hfsplus_lookup(struct inode dir, struct dentry *dentry,
00cd8dd3	31	unsigned int flags)
1da177e4 LT	32	{
	33	struct inode *inode = NULL;
	34	struct hfs_find_data fd;
	35	struct super_block *sb;
	36	hfsplus_cat_entry entry;
	37	int err;
	38	u32 cnid, linkid = 0;
	39	u16 type;
	40
	41	sb = dir->i_sb;
d45bce8f	42
1da177e4	43	dentry->d_fsdata = NULL;
5bd9d99d AK	44	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
	45	if (err)
	46	return ERR_PTR(err);
89ac9b4d SS	47	err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino,
	48	&dentry->d_name);
	49	if (unlikely(err < 0))
	50	goto fail;
1da177e4 LT	51	again:
	52	err = hfs_brec_read(&fd, &entry, sizeof(entry));
	53	if (err) {
	54	if (err == -ENOENT) {
	55	hfs_find_exit(&fd);
	56	/* No such entry */
	57	inode = NULL;
	58	goto out;
	59	}
	60	goto fail;
	61	}
	62	type = be16_to_cpu(entry.type);
	63	if (type == HFSPLUS_FOLDER) {
	64	if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
	65	err = -EIO;
	66	goto fail;
	67	}
	68	cnid = be32_to_cpu(entry.folder.id);
	69	dentry->d_fsdata = (void *)(unsigned long)cnid;
	70	} else if (type == HFSPLUS_FILE) {
	71	if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
	72	err = -EIO;
	73	goto fail;
	74	}
	75	cnid = be32_to_cpu(entry.file.id);
2753cc28 AS	76	if (entry.file.user_info.fdType ==
	77	cpu_to_be32(HFSP_HARDLINK_TYPE) &&
	78	entry.file.user_info.fdCreator ==
	79	cpu_to_be32(HFSP_HFSPLUS_CREATOR) &&
	80	(entry.file.create_date ==
	81	HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)->
	82	create_date \|\|
	83	entry.file.create_date ==
2b0143b5	84	HFSPLUS_I(d_inode(sb->s_root))->
2753cc28 AS	85	create_date) &&
2753cc28 AS	86	HFSPLUS_SB(sb)->hidden_dir) {
1da177e4 LT	87	struct qstr str;
	88	char name[32];
	89
	90	if (dentry->d_fsdata) {
af8c85bb RZ	91	/*
	92	* We found a link pointing to another link,
	93	* so ignore it and treat it as regular file.
	94	*/
	95	cnid = (unsigned long)dentry->d_fsdata;
	96	linkid = 0;
	97	} else {
	98	dentry->d_fsdata = (void *)(unsigned long)cnid;
2753cc28 AS	99	linkid =
2753cc28 AS	100	be32_to_cpu(entry.file.permissions.dev);
af8c85bb RZ	101	str.len = sprintf(name, "iNode%d", linkid);
af8c85bb RZ	102	str.name = name;
89ac9b4d	103	err = hfsplus_cat_build_key(sb, fd.search_key,
2753cc28 AS	104	HFSPLUS_SB(sb)->hidden_dir->i_ino,
2753cc28 AS	105	&str);
89ac9b4d SS	106	if (unlikely(err < 0))
89ac9b4d SS	107	goto fail;
af8c85bb	108	goto again;
1da177e4	109	}
1da177e4 LT	110	} else if (!dentry->d_fsdata)
	111	dentry->d_fsdata = (void *)(unsigned long)cnid;
	112	} else {
d6142673	113	pr_err("invalid catalog entry type in lookup\n");
1da177e4 LT	114	err = -EIO;
	115	goto fail;
	116	}
	117	hfs_find_exit(&fd);
63525391 DH	118	inode = hfsplus_iget(dir->i_sb, cnid);
	119	if (IS_ERR(inode))
	120	return ERR_CAST(inode);
1da177e4	121	if (S_ISREG(inode->i_mode))
f6089ff8	122	HFSPLUS_I(inode)->linkid = linkid;
1da177e4 LT	123	out:
	124	d_add(dentry, inode);
	125	return NULL;
	126	fail:
	127	hfs_find_exit(&fd);
	128	return ERR_PTR(err);
	129	}
	130
e72514e7	131	static int hfsplus_readdir(struct file file, struct dir_context ctx)
1da177e4	132	{
e72514e7	133	struct inode *inode = file_inode(file);
1da177e4 LT	134	struct super_block *sb = inode->i_sb;
1da177e4 LT	135	int len, err;
017f8da4	136	char *strbuf;
1da177e4 LT	137	hfsplus_cat_entry entry;
	138	struct hfs_find_data fd;
	139	struct hfsplus_readdir_data *rd;
	140	u16 type;
	141
e72514e7	142	if (file->f_pos >= inode->i_size)
1da177e4 LT	143	return 0;
1da177e4 LT	144
5bd9d99d AK	145	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
	146	if (err)
	147	return err;
017f8da4 HTL	148	strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN + 1, GFP_KERNEL);
	149	if (!strbuf) {
	150	err = -ENOMEM;
	151	goto out;
	152	}
89ac9b4d	153	hfsplus_cat_build_key_with_cnid(sb, fd.search_key, inode->i_ino);
324ef39a	154	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
1da177e4 LT	155	if (err)
	156	goto out;
	157
e72514e7	158	if (ctx->pos == 0) {
1da177e4	159	/* This is completely artificial... */
e72514e7	160	if (!dir_emit_dot(file, ctx))
1da177e4	161	goto out;
e72514e7 AV	162	ctx->pos = 1;
	163	}
	164	if (ctx->pos == 1) {
6f24f892 GKH	165	if (fd.entrylength > sizeof(entry) \|\| fd.entrylength < 0) {
	166	err = -EIO;
	167	goto out;
	168	}
	169
2753cc28 AS	170	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
2753cc28 AS	171	fd.entrylength);
1da177e4	172	if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
d6142673	173	pr_err("bad catalog folder thread\n");
1da177e4 LT	174	err = -EIO;
	175	goto out;
	176	}
	177	if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
d6142673	178	pr_err("truncated catalog thread\n");
1da177e4 LT	179	err = -EIO;
	180	goto out;
	181	}
e72514e7	182	if (!dir_emit(ctx, "..", 2,
1da177e4 LT	183	be32_to_cpu(entry.thread.parentID), DT_DIR))
1da177e4 LT	184	goto out;
e72514e7	185	ctx->pos = 2;
1da177e4	186	}
e72514e7 AV	187	if (ctx->pos >= inode->i_size)
	188	goto out;
	189	err = hfs_brec_goto(&fd, ctx->pos - 1);
	190	if (err)
	191	goto out;
1da177e4 LT	192	for (;;) {
1da177e4 LT	193	if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
d6142673	194	pr_err("walked past end of dir\n");
1da177e4 LT	195	err = -EIO;
	196	goto out;
	197	}
6f24f892 GKH	198
	199	if (fd.entrylength > sizeof(entry) \|\| fd.entrylength < 0) {
	200	err = -EIO;
	201	goto out;
	202	}
	203
2753cc28 AS	204	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
2753cc28 AS	205	fd.entrylength);
1da177e4	206	type = be16_to_cpu(entry.type);
017f8da4	207	len = NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN;
1da177e4 LT	208	err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len);
	209	if (err)
	210	goto out;
	211	if (type == HFSPLUS_FOLDER) {
2753cc28 AS	212	if (fd.entrylength <
2753cc28 AS	213	sizeof(struct hfsplus_cat_folder)) {
d6142673	214	pr_err("small dir entry\n");
1da177e4 LT	215	err = -EIO;
	216	goto out;
	217	}
dd73a01a CH	218	if (HFSPLUS_SB(sb)->hidden_dir &&
	219	HFSPLUS_SB(sb)->hidden_dir->i_ino ==
	220	be32_to_cpu(entry.folder.id))
1da177e4	221	goto next;
e72514e7	222	if (!dir_emit(ctx, strbuf, len,
1da177e4 LT	223	be32_to_cpu(entry.folder.id), DT_DIR))
	224	break;
	225	} else if (type == HFSPLUS_FILE) {
97a62eae SA	226	u16 mode;
	227	unsigned type = DT_UNKNOWN;
	228
1da177e4	229	if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
d6142673	230	pr_err("small file entry\n");
1da177e4 LT	231	err = -EIO;
	232	goto out;
	233	}
97a62eae SA	234
	235	mode = be16_to_cpu(entry.file.permissions.mode);
	236	if (S_ISREG(mode))
	237	type = DT_REG;
	238	else if (S_ISLNK(mode))
	239	type = DT_LNK;
	240	else if (S_ISFIFO(mode))
	241	type = DT_FIFO;
	242	else if (S_ISCHR(mode))
	243	type = DT_CHR;
	244	else if (S_ISBLK(mode))
	245	type = DT_BLK;
	246	else if (S_ISSOCK(mode))
	247	type = DT_SOCK;
	248
e72514e7	249	if (!dir_emit(ctx, strbuf, len,
97a62eae	250	be32_to_cpu(entry.file.id), type))
1da177e4 LT	251	break;
1da177e4 LT	252	} else {
d6142673	253	pr_err("bad catalog entry type\n");
1da177e4 LT	254	err = -EIO;
	255	goto out;
	256	}
20b7643d	257	next:
e72514e7 AV	258	ctx->pos++;
e72514e7 AV	259	if (ctx->pos >= inode->i_size)
1da177e4 LT	260	goto out;
	261	err = hfs_brec_goto(&fd, 1);
	262	if (err)
	263	goto out;
	264	}
e72514e7	265	rd = file->private_data;
1da177e4 LT	266	if (!rd) {
	267	rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL);
	268	if (!rd) {
	269	err = -ENOMEM;
	270	goto out;
	271	}
e72514e7 AV	272	file->private_data = rd;
e72514e7 AV	273	rd->file = file;
323ee8fc	274	spin_lock(&HFSPLUS_I(inode)->open_dir_lock);
6af502de	275	list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list);
323ee8fc	276	spin_unlock(&HFSPLUS_I(inode)->open_dir_lock);
1da177e4	277	}
323ee8fc AV	278	/*
	279	* Can be done after the list insertion; exclusion with
	280	* hfsplus_delete_cat() is provided by directory lock.
	281	*/
1da177e4 LT	282	memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
1da177e4 LT	283	out:
017f8da4	284	kfree(strbuf);
1da177e4 LT	285	hfs_find_exit(&fd);
	286	return err;
	287	}
	288
	289	static int hfsplus_dir_release(struct inode inode, struct file file)
	290	{
	291	struct hfsplus_readdir_data *rd = file->private_data;
	292	if (rd) {
323ee8fc	293	spin_lock(&HFSPLUS_I(inode)->open_dir_lock);
1da177e4	294	list_del(&rd->list);
323ee8fc	295	spin_unlock(&HFSPLUS_I(inode)->open_dir_lock);
1da177e4 LT	296	kfree(rd);
	297	}
	298	return 0;
	299	}
	300
1da177e4 LT	301	static int hfsplus_link(struct dentry src_dentry, struct inode dst_dir,
	302	struct dentry *dst_dentry)
	303	{
dd73a01a	304	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb);
2b0143b5 DH	305	struct inode *inode = d_inode(src_dentry);
2b0143b5 DH	306	struct inode *src_dir = d_inode(src_dentry->d_parent);
1da177e4 LT	307	struct qstr str;
	308	char name[32];
	309	u32 cnid, id;
	310	int res;
	311
	312	if (HFSPLUS_IS_RSRC(inode))
	313	return -EPERM;
f6089ff8 CH	314	if (!S_ISREG(inode->i_mode))
f6089ff8 CH	315	return -EPERM;
1da177e4	316
7ac9fb9c	317	mutex_lock(&sbi->vh_mutex);
1da177e4 LT	318	if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {
	319	for (;;) {
	320	get_random_bytes(&id, sizeof(cnid));
	321	id &= 0x3fffffff;
	322	str.name = name;
	323	str.len = sprintf(name, "iNode%d", id);
	324	res = hfsplus_rename_cat(inode->i_ino,
	325	src_dir, &src_dentry->d_name,
dd73a01a	326	sbi->hidden_dir, &str);
1da177e4 LT	327	if (!res)
	328	break;
	329	if (res != -EEXIST)
7ac9fb9c	330	goto out;
1da177e4	331	}
f6089ff8	332	HFSPLUS_I(inode)->linkid = id;
dd73a01a	333	cnid = sbi->next_cnid++;
1da177e4	334	src_dentry->d_fsdata = (void *)(unsigned long)cnid;
2753cc28 AS	335	res = hfsplus_create_cat(cnid, src_dir,
2753cc28 AS	336	&src_dentry->d_name, inode);
1da177e4 LT	337	if (res)
1da177e4 LT	338	/* panic? */
7ac9fb9c	339	goto out;
dd73a01a	340	sbi->file_count++;
1da177e4	341	}
dd73a01a	342	cnid = sbi->next_cnid++;
1da177e4 LT	343	res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
1da177e4 LT	344	if (res)
7ac9fb9c	345	goto out;
1da177e4	346
d8c76e6f	347	inc_nlink(inode);
1da177e4	348	hfsplus_instantiate(dst_dentry, inode, cnid);
7de9c6ee	349	ihold(inode);
02027d42	350	inode->i_ctime = current_time(inode);
1da177e4	351	mark_inode_dirty(inode);
dd73a01a	352	sbi->file_count++;
9e6c5829	353	hfsplus_mark_mdb_dirty(dst_dir->i_sb);
7ac9fb9c CH	354	out:
	355	mutex_unlock(&sbi->vh_mutex);
	356	return res;
1da177e4 LT	357	}
	358
	359	static int hfsplus_unlink(struct inode dir, struct dentry dentry)
	360	{
dd73a01a	361	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
2b0143b5	362	struct inode *inode = d_inode(dentry);
1da177e4 LT	363	struct qstr str;
	364	char name[32];
	365	u32 cnid;
	366	int res;
	367
	368	if (HFSPLUS_IS_RSRC(inode))
	369	return -EPERM;
	370
7ac9fb9c	371	mutex_lock(&sbi->vh_mutex);
1da177e4 LT	372	cnid = (u32)(unsigned long)dentry->d_fsdata;
1da177e4 LT	373	if (inode->i_ino == cnid &&
6af502de	374	atomic_read(&HFSPLUS_I(inode)->opencnt)) {
1da177e4 LT	375	str.name = name;
	376	str.len = sprintf(name, "temp%lu", inode->i_ino);
	377	res = hfsplus_rename_cat(inode->i_ino,
	378	dir, &dentry->d_name,
dd73a01a	379	sbi->hidden_dir, &str);
85b8fe8c	380	if (!res) {
1da177e4	381	inode->i_flags \|= S_DEAD;
85b8fe8c CH	382	drop_nlink(inode);
85b8fe8c CH	383	}
7ac9fb9c	384	goto out;
1da177e4 LT	385	}
	386	res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
	387	if (res)
7ac9fb9c	388	goto out;
1da177e4	389
af8c85bb	390	if (inode->i_nlink > 0)
9a53c3a7	391	drop_nlink(inode);
76b0c26a RZ	392	if (inode->i_ino == cnid)
	393	clear_nlink(inode);
	394	if (!inode->i_nlink) {
	395	if (inode->i_ino != cnid) {
dd73a01a	396	sbi->file_count--;
6af502de	397	if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) {
76b0c26a	398	res = hfsplus_delete_cat(inode->i_ino,
dd73a01a	399	sbi->hidden_dir,
76b0c26a RZ	400	NULL);
	401	if (!res)
	402	hfsplus_delete_inode(inode);
	403	} else
	404	inode->i_flags \|= S_DEAD;
1da177e4	405	} else
76b0c26a	406	hfsplus_delete_inode(inode);
af8c85bb	407	} else
dd73a01a	408	sbi->file_count--;
02027d42	409	inode->i_ctime = current_time(inode);
1da177e4	410	mark_inode_dirty(inode);
7ac9fb9c CH	411	out:
7ac9fb9c CH	412	mutex_unlock(&sbi->vh_mutex);
1da177e4 LT	413	return res;
	414	}
	415
1da177e4 LT	416	static int hfsplus_rmdir(struct inode dir, struct dentry dentry)
1da177e4 LT	417	{
7ac9fb9c	418	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
2b0143b5	419	struct inode *inode = d_inode(dentry);
1da177e4 LT	420	int res;
1da177e4 LT	421
1da177e4 LT	422	if (inode->i_size != 2)
1da177e4 LT	423	return -ENOTEMPTY;
7ac9fb9c CH	424
7ac9fb9c CH	425	mutex_lock(&sbi->vh_mutex);
1da177e4 LT	426	res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
1da177e4 LT	427	if (res)
7ac9fb9c	428	goto out;
ce71ec36	429	clear_nlink(inode);
02027d42	430	inode->i_ctime = current_time(inode);
1da177e4 LT	431	hfsplus_delete_inode(inode);
1da177e4 LT	432	mark_inode_dirty(inode);
7ac9fb9c CH	433	out:
	434	mutex_unlock(&sbi->vh_mutex);
	435	return res;
1da177e4 LT	436	}
	437
	438	static int hfsplus_symlink(struct inode dir, struct dentry dentry,
	439	const char *symname)
	440	{
7ac9fb9c	441	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
1da177e4	442	struct inode *inode;
27a4e388	443	int res = -ENOMEM;
1da177e4	444
7ac9fb9c	445	mutex_lock(&sbi->vh_mutex);
f17c89bf	446	inode = hfsplus_new_inode(dir->i_sb, S_IFLNK \| S_IRWXUGO);
1da177e4	447	if (!inode)
7ac9fb9c	448	goto out;
1da177e4 LT	449
1da177e4 LT	450	res = page_symlink(inode, symname, strlen(symname) + 1);
f17c89bf CH	451	if (res)
f17c89bf CH	452	goto out_err;
1da177e4	453
1da177e4	454	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
f17c89bf CH	455	if (res)
f17c89bf CH	456	goto out_err;
1da177e4	457
324ef39a VD	458	res = hfsplus_init_inode_security(inode, dir, &dentry->d_name);
	459	if (res == -EOPNOTSUPP)
	460	res = 0; /* Operation is not supported. */
	461	else if (res) {
	462	/* Try to delete anyway without error analysis. */
	463	hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
	464	goto out_err;
	465	}
	466
f17c89bf CH	467	hfsplus_instantiate(dentry, inode, inode->i_ino);
f17c89bf CH	468	mark_inode_dirty(inode);
7ac9fb9c	469	goto out;
1da177e4	470
f17c89bf	471	out_err:
6d6b77f1	472	clear_nlink(inode);
f17c89bf CH	473	hfsplus_delete_inode(inode);
f17c89bf CH	474	iput(inode);
7ac9fb9c CH	475	out:
7ac9fb9c CH	476	mutex_unlock(&sbi->vh_mutex);
1da177e4 LT	477	return res;
	478	}
	479
	480	static int hfsplus_mknod(struct inode dir, struct dentry dentry,
1a67aafb	481	umode_t mode, dev_t rdev)
1da177e4	482	{
7ac9fb9c	483	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
1da177e4	484	struct inode *inode;
27a4e388	485	int res = -ENOMEM;
1da177e4	486
7ac9fb9c	487	mutex_lock(&sbi->vh_mutex);
30d3abbe	488	inode = hfsplus_new_inode(dir->i_sb, mode);
1da177e4	489	if (!inode)
7ac9fb9c	490	goto out;
1da177e4	491
90e61690 CH	492	if (S_ISBLK(mode) \|\| S_ISCHR(mode) \|\| S_ISFIFO(mode) \|\| S_ISSOCK(mode))
	493	init_special_inode(inode, mode, rdev);
	494
1da177e4	495	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
324ef39a VD	496	if (res)
	497	goto failed_mknod;
	498
	499	res = hfsplus_init_inode_security(inode, dir, &dentry->d_name);
	500	if (res == -EOPNOTSUPP)
	501	res = 0; /* Operation is not supported. */
	502	else if (res) {
	503	/* Try to delete anyway without error analysis. */
	504	hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
	505	goto failed_mknod;
1da177e4	506	}
30d3abbe	507
1da177e4 LT	508	hfsplus_instantiate(dentry, inode, inode->i_ino);
1da177e4 LT	509	mark_inode_dirty(inode);
324ef39a VD	510	goto out;
	511
	512	failed_mknod:
	513	clear_nlink(inode);
	514	hfsplus_delete_inode(inode);
	515	iput(inode);
7ac9fb9c CH	516	out:
	517	mutex_unlock(&sbi->vh_mutex);
	518	return res;
1da177e4 LT	519	}
1da177e4 LT	520
4acdaf27	521	static int hfsplus_create(struct inode dir, struct dentry dentry, umode_t mode,
ebfc3b49	522	bool excl)
30d3abbe CH	523	{
	524	return hfsplus_mknod(dir, dentry, mode, 0);
	525	}
	526
18bb1db3	527	static int hfsplus_mkdir(struct inode dir, struct dentry dentry, umode_t mode)
30d3abbe CH	528	{
	529	return hfsplus_mknod(dir, dentry, mode \| S_IFDIR, 0);
	530	}
	531
1da177e4	532	static int hfsplus_rename(struct inode old_dir, struct dentry old_dentry,
f03b8ad8 MS	533	struct inode new_dir, struct dentry new_dentry,
f03b8ad8 MS	534	unsigned int flags)
1da177e4 LT	535	{
	536	int res;
	537
f03b8ad8 MS	538	if (flags & ~RENAME_NOREPLACE)
	539	return -EINVAL;
	540
1da177e4	541	/* Unlink destination if it already exists */
2b0143b5	542	if (d_really_is_positive(new_dentry)) {
e36cb0b8	543	if (d_is_dir(new_dentry))
40de9a7c	544	res = hfsplus_rmdir(new_dir, new_dentry);
e3911785	545	else
40de9a7c	546	res = hfsplus_unlink(new_dir, new_dentry);
1da177e4 LT	547	if (res)
	548	return res;
	549	}
	550
	551	res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata,
	552	old_dir, &old_dentry->d_name,
	553	new_dir, &new_dentry->d_name);
	554	if (!res)
	555	new_dentry->d_fsdata = old_dentry->d_fsdata;
	556	return res;
	557	}
	558
92e1d5be	559	const struct inode_operations hfsplus_dir_inode_operations = {
324ef39a VD	560	.lookup = hfsplus_lookup,
	561	.create = hfsplus_create,
	562	.link = hfsplus_link,
	563	.unlink = hfsplus_unlink,
	564	.mkdir = hfsplus_mkdir,
	565	.rmdir = hfsplus_rmdir,
	566	.symlink = hfsplus_symlink,
	567	.mknod = hfsplus_mknod,
	568	.rename = hfsplus_rename,
324ef39a	569	.listxattr = hfsplus_listxattr,
b4c1107c VD	570	#ifdef CONFIG_HFSPLUS_FS_POSIX_ACL
b4c1107c VD	571	.get_acl = hfsplus_get_posix_acl,
b0a7ab57	572	.set_acl = hfsplus_set_posix_acl,
b4c1107c	573	#endif
1da177e4 LT	574	};
1da177e4 LT	575
4b6f5d20	576	const struct file_operations hfsplus_dir_operations = {
eb29d66d	577	.fsync = hfsplus_file_fsync,
1da177e4	578	.read = generic_read_dir,
323ee8fc	579	.iterate_shared = hfsplus_readdir,
7cc4bcc6	580	.unlocked_ioctl = hfsplus_ioctl,
1da177e4 LT	581	.llseek = generic_file_llseek,
	582	.release = hfsplus_dir_release,
	583	};