[linux-2.6-block.git] / fs / hfsplus / ioctl.c

/*
 *  linux/fs/hfsplus/ioctl.c
 *
 * Copyright (C) 2003
 * Ethan Benson <erbenson@alaska.net>
 * partially derived from linux/fs/ext2/ioctl.c
 * Copyright (C) 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 * hfsplus ioctls
 */

#include <linux/capability.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/sched.h>
#include <linux/xattr.h>
#include <asm/uaccess.h>
#include "hfsplus_fs.h"

/*
 * "Blessing" an HFS+ filesystem writes metadata to the superblock informing
 * the platform firmware which file to boot from
 */
static int hfsplus_ioctl_bless(struct file *file, int __user *user_flags)
{
	struct dentry *dentry = file->f_path.dentry;
	struct inode *inode = dentry->d_inode;
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
	struct hfsplus_vh *vh = sbi->s_vhdr;
	struct hfsplus_vh *bvh = sbi->s_backup_vhdr;
	u32 cnid = (unsigned long)dentry->d_fsdata;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	mutex_lock(&sbi->vh_mutex);

	/* Directory containing the bootable system */
	vh->finder_info[0] = bvh->finder_info[0] =
		cpu_to_be32(parent_ino(dentry));

	/*
	 * Bootloader. Just using the inode here breaks in the case of
	 * hard links - the firmware wants the ID of the hard link file,
	 * but the inode points at the indirect inode
	 */
	vh->finder_info[1] = bvh->finder_info[1] = cpu_to_be32(cnid);

	/* Per spec, the OS X system folder - same as finder_info[0] here */
	vh->finder_info[5] = bvh->finder_info[5] =
		cpu_to_be32(parent_ino(dentry));

	mutex_unlock(&sbi->vh_mutex);
	return 0;
}

static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags)
{
	struct inode *inode = file_inode(file);
	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
	unsigned int flags = 0;

	if (inode->i_flags & S_IMMUTABLE)
		flags |= FS_IMMUTABLE_FL;
	if (inode->i_flags & S_APPEND)
		flags |= FS_APPEND_FL;
	if (hip->userflags & HFSPLUS_FLG_NODUMP)
		flags |= FS_NODUMP_FL;

	return put_user(flags, user_flags);
}

static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags)
{
	struct inode *inode = file_inode(file);
	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
	unsigned int flags;
	int err = 0;

	err = mnt_want_write_file(file);
	if (err)
		goto out;

	if (!inode_owner_or_capable(inode)) {
		err = -EACCES;
		goto out_drop_write;
	}

	if (get_user(flags, user_flags)) {
		err = -EFAULT;
		goto out_drop_write;
	}

	mutex_lock(&inode->i_mutex);

	if ((flags & (FS_IMMUTABLE_FL|FS_APPEND_FL)) ||
	    inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
		if (!capable(CAP_LINUX_IMMUTABLE)) {
			err = -EPERM;
			goto out_unlock_inode;
		}
	}

	/* don't silently ignore unsupported ext2 flags */
	if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL)) {
		err = -EOPNOTSUPP;
		goto out_unlock_inode;
	}

	if (flags & FS_IMMUTABLE_FL)
		inode->i_flags |= S_IMMUTABLE;
	else
		inode->i_flags &= ~S_IMMUTABLE;

	if (flags & FS_APPEND_FL)
		inode->i_flags |= S_APPEND;
	else
		inode->i_flags &= ~S_APPEND;

	if (flags & FS_NODUMP_FL)
		hip->userflags |= HFSPLUS_FLG_NODUMP;
	else
		hip->userflags &= ~HFSPLUS_FLG_NODUMP;

	inode->i_ctime = CURRENT_TIME_SEC;
	mark_inode_dirty(inode);

out_unlock_inode:
	mutex_unlock(&inode->i_mutex);
out_drop_write:
	mnt_drop_write_file(file);
out:
	return err;
}

long hfsplus_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	void __user *argp = (void __user *)arg;

	switch (cmd) {
	case HFSPLUS_IOC_EXT2_GETFLAGS:
		return hfsplus_ioctl_getflags(file, argp);
	case HFSPLUS_IOC_EXT2_SETFLAGS:
		return hfsplus_ioctl_setflags(file, argp);
	case HFSPLUS_IOC_BLESS:
		return hfsplus_ioctl_bless(file, argp);
	default:
		return -ENOTTY;
	}
}

int hfsplus_setxattr(struct dentry *dentry, const char *name,
		     const void *value, size_t size, int flags)
{
	struct inode *inode = dentry->d_inode;
	struct hfs_find_data fd;
	hfsplus_cat_entry entry;
	struct hfsplus_cat_file *file;
	int res;

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

	res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
	if (res)
		return res;
	res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
	if (res)
		goto out;
	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
			sizeof(struct hfsplus_cat_file));
	file = &entry.file;

	if (!strcmp(name, "hfs.type")) {
		if (size == 4)
			memcpy(&file->user_info.fdType, value, 4);
		else
			res = -ERANGE;
	} else if (!strcmp(name, "hfs.creator")) {
		if (size == 4)
			memcpy(&file->user_info.fdCreator, value, 4);
		else
			res = -ERANGE;
	} else
		res = -EOPNOTSUPP;
	if (!res) {
		hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
				sizeof(struct hfsplus_cat_file));
		hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
	}
out:
	hfs_find_exit(&fd);
	return res;
}

ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
			 void *value, size_t size)
{
	struct inode *inode = dentry->d_inode;
	struct hfs_find_data fd;
	hfsplus_cat_entry entry;
	struct hfsplus_cat_file *file;
	ssize_t res = 0;

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

	if (size) {
		res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
		if (res)
			return res;
		res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
		if (res)
			goto out;
		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
				sizeof(struct hfsplus_cat_file));
	}
	file = &entry.file;

	if (!strcmp(name, "hfs.type")) {
		if (size >= 4) {
			memcpy(value, &file->user_info.fdType, 4);
			res = 4;
		} else
			res = size ? -ERANGE : 4;
	} else if (!strcmp(name, "hfs.creator")) {
		if (size >= 4) {
			memcpy(value, &file->user_info.fdCreator, 4);
			res = 4;
		} else
			res = size ? -ERANGE : 4;
	} else
		res = -EOPNOTSUPP;
out:
	if (size)
		hfs_find_exit(&fd);
	return res;
}

#define HFSPLUS_ATTRLIST_SIZE (sizeof("hfs.creator")+sizeof("hfs.type"))

ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
{
	struct inode *inode = dentry->d_inode;

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

	if (!buffer || !size)
		return HFSPLUS_ATTRLIST_SIZE;
	if (size < HFSPLUS_ATTRLIST_SIZE)
		return -ERANGE;
	strcpy(buffer, "hfs.type");
	strcpy(buffer + sizeof("hfs.type"), "hfs.creator");

	return HFSPLUS_ATTRLIST_SIZE;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/hfsplus/ioctl.c
	3	*
	4	* Copyright (C) 2003
	5	* Ethan Benson <erbenson@alaska.net>
	6	* partially derived from linux/fs/ext2/ioctl.c
	7	* Copyright (C) 1993, 1994, 1995
	8	* Remy Card (card@masi.ibp.fr)
	9	* Laboratoire MASI - Institut Blaise Pascal
	10	* Universite Pierre et Marie Curie (Paris VI)
	11	*
	12	* hfsplus ioctls
	13	*/
	14
16f7e0fe	15	#include <linux/capability.h>
1da177e4	16	#include <linux/fs.h>
42a74f20	17	#include <linux/mount.h>
1da177e4 LT	18	#include <linux/sched.h>
	19	#include <linux/xattr.h>
	20	#include <asm/uaccess.h>
	21	#include "hfsplus_fs.h"
	22
a051f71c MG	23	/*
	24	* "Blessing" an HFS+ filesystem writes metadata to the superblock informing
	25	* the platform firmware which file to boot from
	26	*/
	27	static int hfsplus_ioctl_bless(struct file file, int __user user_flags)
	28	{
	29	struct dentry *dentry = file->f_path.dentry;
	30	struct inode *inode = dentry->d_inode;
	31	struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
	32	struct hfsplus_vh *vh = sbi->s_vhdr;
	33	struct hfsplus_vh *bvh = sbi->s_backup_vhdr;
7dea9665	34	u32 cnid = (unsigned long)dentry->d_fsdata;
a051f71c MG	35
	36	if (!capable(CAP_SYS_ADMIN))
	37	return -EPERM;
	38
	39	mutex_lock(&sbi->vh_mutex);
	40
	41	/* Directory containing the bootable system */
	42	vh->finder_info[0] = bvh->finder_info[0] =
	43	cpu_to_be32(parent_ino(dentry));
	44
7dea9665 MG	45	/*
	46	* Bootloader. Just using the inode here breaks in the case of
	47	* hard links - the firmware wants the ID of the hard link file,
	48	* but the inode points at the indirect inode
	49	*/
	50	vh->finder_info[1] = bvh->finder_info[1] = cpu_to_be32(cnid);
a051f71c MG	51
	52	/* Per spec, the OS X system folder - same as finder_info[0] here */
	53	vh->finder_info[5] = bvh->finder_info[5] =
	54	cpu_to_be32(parent_ino(dentry));
	55
	56	mutex_unlock(&sbi->vh_mutex);
	57	return 0;
	58	}
	59
94744567	60	static int hfsplus_ioctl_getflags(struct file file, int __user user_flags)
1da177e4	61	{
496ad9aa	62	struct inode *inode = file_inode(file);
6af502de	63	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
94744567 CH	64	unsigned int flags = 0;
94744567 CH	65
722c55d1	66	if (inode->i_flags & S_IMMUTABLE)
94744567	67	flags \|= FS_IMMUTABLE_FL;
596276c3	68	if (inode->i_flags & S_APPEND)
94744567	69	flags \|= FS_APPEND_FL;
6af502de	70	if (hip->userflags & HFSPLUS_FLG_NODUMP)
94744567 CH	71	flags \|= FS_NODUMP_FL;
	72
	73	return put_user(flags, user_flags);
	74	}
	75
	76	static int hfsplus_ioctl_setflags(struct file file, int __user user_flags)
	77	{
496ad9aa	78	struct inode *inode = file_inode(file);
6af502de	79	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
1da177e4	80	unsigned int flags;
94744567	81	int err = 0;
1da177e4	82
a561be71	83	err = mnt_want_write_file(file);
94744567	84	if (err)
6333816a	85	goto out;
1da177e4	86
2e149670	87	if (!inode_owner_or_capable(inode)) {
94744567 CH	88	err = -EACCES;
	89	goto out_drop_write;
	90	}
1da177e4	91
94744567 CH	92	if (get_user(flags, user_flags)) {
	93	err = -EFAULT;
	94	goto out_drop_write;
	95	}
	96
6333816a CH	97	mutex_lock(&inode->i_mutex);
6333816a CH	98
722c55d1 CH	99	if ((flags & (FS_IMMUTABLE_FL\|FS_APPEND_FL)) \|\|
722c55d1 CH	100	inode->i_flags & (S_IMMUTABLE\|S_APPEND)) {
94744567 CH	101	if (!capable(CAP_LINUX_IMMUTABLE)) {
94744567 CH	102	err = -EPERM;
6333816a	103	goto out_unlock_inode;
1da177e4	104	}
1da177e4	105	}
94744567 CH	106
	107	/* don't silently ignore unsupported ext2 flags */
	108	if (flags & ~(FS_IMMUTABLE_FL\|FS_APPEND_FL\|FS_NODUMP_FL)) {
	109	err = -EOPNOTSUPP;
6333816a	110	goto out_unlock_inode;
94744567	111	}
722c55d1 CH	112
722c55d1 CH	113	if (flags & FS_IMMUTABLE_FL)
94744567	114	inode->i_flags \|= S_IMMUTABLE;
722c55d1	115	else
94744567	116	inode->i_flags &= ~S_IMMUTABLE;
722c55d1 CH	117
722c55d1 CH	118	if (flags & FS_APPEND_FL)
94744567	119	inode->i_flags \|= S_APPEND;
722c55d1	120	else
94744567	121	inode->i_flags &= ~S_APPEND;
722c55d1	122
94744567	123	if (flags & FS_NODUMP_FL)
6af502de	124	hip->userflags \|= HFSPLUS_FLG_NODUMP;
94744567	125	else
6af502de	126	hip->userflags &= ~HFSPLUS_FLG_NODUMP;
94744567 CH	127
	128	inode->i_ctime = CURRENT_TIME_SEC;
	129	mark_inode_dirty(inode);
	130
6333816a	131	out_unlock_inode:
e50fb58b	132	mutex_unlock(&inode->i_mutex);
94744567	133	out_drop_write:
2a79f17e	134	mnt_drop_write_file(file);
6333816a	135	out:
94744567 CH	136	return err;
	137	}
	138
	139	long hfsplus_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	140	{
	141	void __user argp = (void __user )arg;
	142
	143	switch (cmd) {
	144	case HFSPLUS_IOC_EXT2_GETFLAGS:
	145	return hfsplus_ioctl_getflags(file, argp);
	146	case HFSPLUS_IOC_EXT2_SETFLAGS:
	147	return hfsplus_ioctl_setflags(file, argp);
a051f71c MG	148	case HFSPLUS_IOC_BLESS:
a051f71c MG	149	return hfsplus_ioctl_bless(file, argp);
1da177e4 LT	150	default:
	151	return -ENOTTY;
	152	}
	153	}
	154
	155	int hfsplus_setxattr(struct dentry dentry, const char name,
	156	const void *value, size_t size, int flags)
	157	{
	158	struct inode *inode = dentry->d_inode;
	159	struct hfs_find_data fd;
	160	hfsplus_cat_entry entry;
	161	struct hfsplus_cat_file *file;
	162	int res;
	163
	164	if (!S_ISREG(inode->i_mode) \|\| HFSPLUS_IS_RSRC(inode))
	165	return -EOPNOTSUPP;
	166
dd73a01a	167	res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
1da177e4 LT	168	if (res)
	169	return res;
	170	res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
	171	if (res)
	172	goto out;
	173	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
	174	sizeof(struct hfsplus_cat_file));
	175	file = &entry.file;
	176
	177	if (!strcmp(name, "hfs.type")) {
	178	if (size == 4)
	179	memcpy(&file->user_info.fdType, value, 4);
	180	else
	181	res = -ERANGE;
	182	} else if (!strcmp(name, "hfs.creator")) {
	183	if (size == 4)
	184	memcpy(&file->user_info.fdCreator, value, 4);
	185	else
	186	res = -ERANGE;
	187	} else
	188	res = -EOPNOTSUPP;
e3494705	189	if (!res) {
1da177e4 LT	190	hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
1da177e4 LT	191	sizeof(struct hfsplus_cat_file));
e3494705 CH	192	hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
e3494705 CH	193	}
1da177e4 LT	194	out:
	195	hfs_find_exit(&fd);
	196	return res;
	197	}
	198
	199	ssize_t hfsplus_getxattr(struct dentry dentry, const char name,
	200	void *value, size_t size)
	201	{
	202	struct inode *inode = dentry->d_inode;
	203	struct hfs_find_data fd;
	204	hfsplus_cat_entry entry;
	205	struct hfsplus_cat_file *file;
	206	ssize_t res = 0;
	207
	208	if (!S_ISREG(inode->i_mode) \|\| HFSPLUS_IS_RSRC(inode))
	209	return -EOPNOTSUPP;
	210
	211	if (size) {
dd73a01a	212	res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
1da177e4 LT	213	if (res)
	214	return res;
	215	res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
	216	if (res)
	217	goto out;
	218	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
	219	sizeof(struct hfsplus_cat_file));
	220	}
	221	file = &entry.file;
	222
	223	if (!strcmp(name, "hfs.type")) {
	224	if (size >= 4) {
	225	memcpy(value, &file->user_info.fdType, 4);
	226	res = 4;
	227	} else
	228	res = size ? -ERANGE : 4;
	229	} else if (!strcmp(name, "hfs.creator")) {
	230	if (size >= 4) {
	231	memcpy(value, &file->user_info.fdCreator, 4);
	232	res = 4;
	233	} else
	234	res = size ? -ERANGE : 4;
	235	} else
46bf36ec	236	res = -EOPNOTSUPP;
1da177e4 LT	237	out:
	238	if (size)
	239	hfs_find_exit(&fd);
	240	return res;
	241	}
	242
	243	#define HFSPLUS_ATTRLIST_SIZE (sizeof("hfs.creator")+sizeof("hfs.type"))
	244
	245	ssize_t hfsplus_listxattr(struct dentry dentry, char buffer, size_t size)
	246	{
	247	struct inode *inode = dentry->d_inode;
	248
	249	if (!S_ISREG(inode->i_mode) \|\| HFSPLUS_IS_RSRC(inode))
	250	return -EOPNOTSUPP;
	251
	252	if (!buffer \|\| !size)
	253	return HFSPLUS_ATTRLIST_SIZE;
	254	if (size < HFSPLUS_ATTRLIST_SIZE)
	255	return -ERANGE;
	256	strcpy(buffer, "hfs.type");
	257	strcpy(buffer + sizeof("hfs.type"), "hfs.creator");
	258
	259	return HFSPLUS_ATTRLIST_SIZE;
	260	}