[people/ms/linux.git] / fs / reiserfs / ioctl.c

/*
 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
 */

#include <linux/capability.h>
#include <linux/fs.h>
#include <linux/reiserfs_fs.h>
#include <linux/time.h>
#include <asm/uaccess.h>
#include <linux/pagemap.h>
#include <linux/smp_lock.h>
#include <linux/compat.h>

static int reiserfs_unpack(struct inode *inode, struct file *filp);

/*
** reiserfs_ioctl - handler for ioctl for inode
** supported commands:
**  1) REISERFS_IOC_UNPACK - try to unpack tail from direct item into indirect
**                           and prevent packing file (argument arg has to be non-zero)
**  2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION
**  3) That's all for a while ...
*/
int reiserfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
		   unsigned long arg)
{
	unsigned int flags;

	switch (cmd) {
	case REISERFS_IOC_UNPACK:
		if (S_ISREG(inode->i_mode)) {
			if (arg)
				return reiserfs_unpack(inode, filp);
			else
				return 0;
		} else
			return -ENOTTY;
		/* following two cases are taken from fs/ext2/ioctl.c by Remy
		   Card (card@masi.ibp.fr) */
	case REISERFS_IOC_GETFLAGS:
		if (!reiserfs_attrs(inode->i_sb))
			return -ENOTTY;

		flags = REISERFS_I(inode)->i_attrs;
		i_attrs_to_sd_attrs(inode, (__u16 *) & flags);
		return put_user(flags, (int __user *)arg);
	case REISERFS_IOC_SETFLAGS:{
			if (!reiserfs_attrs(inode->i_sb))
				return -ENOTTY;

			if (IS_RDONLY(inode))
				return -EROFS;

			if (!is_owner_or_cap(inode))
				return -EPERM;

			if (get_user(flags, (int __user *)arg))
				return -EFAULT;

			if (((flags ^ REISERFS_I(inode)->
			      i_attrs) & (REISERFS_IMMUTABLE_FL |
					  REISERFS_APPEND_FL))
			    && !capable(CAP_LINUX_IMMUTABLE))
				return -EPERM;

			if ((flags & REISERFS_NOTAIL_FL) &&
			    S_ISREG(inode->i_mode)) {
				int result;

				result = reiserfs_unpack(inode, filp);
				if (result)
					return result;
			}
			sd_attrs_to_i_attrs(flags, inode);
			REISERFS_I(inode)->i_attrs = flags;
			inode->i_ctime = CURRENT_TIME_SEC;
			mark_inode_dirty(inode);
			return 0;
		}
	case REISERFS_IOC_GETVERSION:
		return put_user(inode->i_generation, (int __user *)arg);
	case REISERFS_IOC_SETVERSION:
		if (!is_owner_or_cap(inode))
			return -EPERM;
		if (IS_RDONLY(inode))
			return -EROFS;
		if (get_user(inode->i_generation, (int __user *)arg))
			return -EFAULT;
		inode->i_ctime = CURRENT_TIME_SEC;
		mark_inode_dirty(inode);
		return 0;
	default:
		return -ENOTTY;
	}
}

#ifdef CONFIG_COMPAT
long reiserfs_compat_ioctl(struct file *file, unsigned int cmd,
				unsigned long arg)
{
	struct inode *inode = file->f_path.dentry->d_inode;
	int ret;

	/* These are just misnamed, they actually get/put from/to user an int */
	switch (cmd) {
	case REISERFS_IOC32_UNPACK:
		cmd = REISERFS_IOC_UNPACK;
		break;
	case REISERFS_IOC32_GETFLAGS:
		cmd = REISERFS_IOC_GETFLAGS;
		break;
	case REISERFS_IOC32_SETFLAGS:
		cmd = REISERFS_IOC_SETFLAGS;
		break;
	case REISERFS_IOC32_GETVERSION:
		cmd = REISERFS_IOC_GETVERSION;
		break;
	case REISERFS_IOC32_SETVERSION:
		cmd = REISERFS_IOC_SETVERSION;
		break;
	default:
		return -ENOIOCTLCMD;
	}
	lock_kernel();
	ret = reiserfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
	unlock_kernel();
	return ret;
}
#endif

/*
** reiserfs_unpack
** Function try to convert tail from direct item into indirect.
** It set up nopack attribute in the REISERFS_I(inode)->nopack
*/
static int reiserfs_unpack(struct inode *inode, struct file *filp)
{
	int retval = 0;
	int index;
	struct page *page;
	struct address_space *mapping;
	unsigned long write_from;
	unsigned long blocksize = inode->i_sb->s_blocksize;

	if (inode->i_size == 0) {
		REISERFS_I(inode)->i_flags |= i_nopack_mask;
		return 0;
	}
	/* ioctl already done */
	if (REISERFS_I(inode)->i_flags & i_nopack_mask) {
		return 0;
	}

	/* we need to make sure nobody is changing the file size beneath
	 ** us
	 */
	mutex_lock(&inode->i_mutex);
	reiserfs_write_lock(inode->i_sb);

	write_from = inode->i_size & (blocksize - 1);
	/* if we are on a block boundary, we are already unpacked.  */
	if (write_from == 0) {
		REISERFS_I(inode)->i_flags |= i_nopack_mask;
		goto out;
	}

	/* we unpack by finding the page with the tail, and calling
	 ** reiserfs_prepare_write on that page.  This will force a 
	 ** reiserfs_get_block to unpack the tail for us.
	 */
	index = inode->i_size >> PAGE_CACHE_SHIFT;
	mapping = inode->i_mapping;
	page = grab_cache_page(mapping, index);
	retval = -ENOMEM;
	if (!page) {
		goto out;
	}
	retval =
	    mapping->a_ops->prepare_write(NULL, page, write_from, write_from);
	if (retval)
		goto out_unlock;

	/* conversion can change page contents, must flush */
	flush_dcache_page(page);
	retval =
	    mapping->a_ops->commit_write(NULL, page, write_from, write_from);
	REISERFS_I(inode)->i_flags |= i_nopack_mask;

      out_unlock:
	unlock_page(page);
	page_cache_release(page);

      out:
	mutex_unlock(&inode->i_mutex);
	reiserfs_write_unlock(inode->i_sb);
	return retval;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
	3	*/
	4
16f7e0fe	5	#include <linux/capability.h>
1da177e4 LT	6	#include <linux/fs.h>
	7	#include <linux/reiserfs_fs.h>
	8	#include <linux/time.h>
	9	#include <asm/uaccess.h>
	10	#include <linux/pagemap.h>
	11	#include <linux/smp_lock.h>
52b499c4	12	#include <linux/compat.h>
1da177e4	13
bd4c625c	14	static int reiserfs_unpack(struct inode inode, struct file filp);
1da177e4 LT	15
	16	/*
	17	** reiserfs_ioctl - handler for ioctl for inode
	18	** supported commands:
	19	** 1) REISERFS_IOC_UNPACK - try to unpack tail from direct item into indirect
	20	** and prevent packing file (argument arg has to be non-zero)
	21	** 2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION
	22	** 3) That's all for a while ...
	23	*/
bd4c625c LT	24	int reiserfs_ioctl(struct inode inode, struct file filp, unsigned int cmd,
bd4c625c LT	25	unsigned long arg)
1da177e4 LT	26	{
	27	unsigned int flags;
	28
	29	switch (cmd) {
bd4c625c LT	30	case REISERFS_IOC_UNPACK:
	31	if (S_ISREG(inode->i_mode)) {
	32	if (arg)
	33	return reiserfs_unpack(inode, filp);
1da177e4 LT	34	else
	35	return 0;
	36	} else
	37	return -ENOTTY;
bd4c625c LT	38	/* following two cases are taken from fs/ext2/ioctl.c by Remy
bd4c625c LT	39	Card (card@masi.ibp.fr) */
1da177e4	40	case REISERFS_IOC_GETFLAGS:
bd4c625c	41	if (!reiserfs_attrs(inode->i_sb))
869eb76e JM	42	return -ENOTTY;
869eb76e JM	43
bd4c625c LT	44	flags = REISERFS_I(inode)->i_attrs;
	45	i_attrs_to_sd_attrs(inode, (__u16 *) & flags);
	46	return put_user(flags, (int __user *)arg);
	47	case REISERFS_IOC_SETFLAGS:{
	48	if (!reiserfs_attrs(inode->i_sb))
	49	return -ENOTTY;
869eb76e	50
bd4c625c LT	51	if (IS_RDONLY(inode))
bd4c625c LT	52	return -EROFS;
1da177e4	53
3bd858ab	54	if (!is_owner_or_cap(inode))
bd4c625c	55	return -EPERM;
1da177e4	56
bd4c625c LT	57	if (get_user(flags, (int __user *)arg))
bd4c625c LT	58	return -EFAULT;
1da177e4	59
bd4c625c LT	60	if (((flags ^ REISERFS_I(inode)->
	61	i_attrs) & (REISERFS_IMMUTABLE_FL \|
	62	REISERFS_APPEND_FL))
	63	&& !capable(CAP_LINUX_IMMUTABLE))
	64	return -EPERM;
	65
	66	if ((flags & REISERFS_NOTAIL_FL) &&
	67	S_ISREG(inode->i_mode)) {
1da177e4 LT	68	int result;
1da177e4 LT	69
bd4c625c LT	70	result = reiserfs_unpack(inode, filp);
bd4c625c LT	71	if (result)
1da177e4	72	return result;
bd4c625c LT	73	}
	74	sd_attrs_to_i_attrs(flags, inode);
	75	REISERFS_I(inode)->i_attrs = flags;
	76	inode->i_ctime = CURRENT_TIME_SEC;
	77	mark_inode_dirty(inode);
	78	return 0;
1da177e4	79	}
1da177e4	80	case REISERFS_IOC_GETVERSION:
bd4c625c	81	return put_user(inode->i_generation, (int __user *)arg);
1da177e4	82	case REISERFS_IOC_SETVERSION:
3bd858ab	83	if (!is_owner_or_cap(inode))
1da177e4 LT	84	return -EPERM;
	85	if (IS_RDONLY(inode))
	86	return -EROFS;
bd4c625c LT	87	if (get_user(inode->i_generation, (int __user *)arg))
bd4c625c LT	88	return -EFAULT;
1da177e4 LT	89	inode->i_ctime = CURRENT_TIME_SEC;
	90	mark_inode_dirty(inode);
	91	return 0;
	92	default:
	93	return -ENOTTY;
	94	}
	95	}
	96
52b499c4 DH	97	#ifdef CONFIG_COMPAT
	98	long reiserfs_compat_ioctl(struct file *file, unsigned int cmd,
	99	unsigned long arg)
	100	{
1fc5adbd	101	struct inode *inode = file->f_path.dentry->d_inode;
52b499c4 DH	102	int ret;
	103
	104	/* These are just misnamed, they actually get/put from/to user an int */
	105	switch (cmd) {
	106	case REISERFS_IOC32_UNPACK:
	107	cmd = REISERFS_IOC_UNPACK;
	108	break;
	109	case REISERFS_IOC32_GETFLAGS:
	110	cmd = REISERFS_IOC_GETFLAGS;
	111	break;
	112	case REISERFS_IOC32_SETFLAGS:
	113	cmd = REISERFS_IOC_SETFLAGS;
	114	break;
	115	case REISERFS_IOC32_GETVERSION:
	116	cmd = REISERFS_IOC_GETVERSION;
	117	break;
	118	case REISERFS_IOC32_SETVERSION:
	119	cmd = REISERFS_IOC_SETVERSION;
	120	break;
	121	default:
	122	return -ENOIOCTLCMD;
	123	}
	124	lock_kernel();
	125	ret = reiserfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
	126	unlock_kernel();
	127	return ret;
	128	}
	129	#endif
	130
1da177e4 LT	131	/*
	132	** reiserfs_unpack
	133	** Function try to convert tail from direct item into indirect.
	134	** It set up nopack attribute in the REISERFS_I(inode)->nopack
	135	*/
bd4c625c	136	static int reiserfs_unpack(struct inode inode, struct file filp)
1da177e4	137	{
bd4c625c LT	138	int retval = 0;
	139	int index;
	140	struct page *page;
	141	struct address_space *mapping;
	142	unsigned long write_from;
	143	unsigned long blocksize = inode->i_sb->s_blocksize;
	144
	145	if (inode->i_size == 0) {
	146	REISERFS_I(inode)->i_flags \|= i_nopack_mask;
	147	return 0;
	148	}
	149	/* ioctl already done */
	150	if (REISERFS_I(inode)->i_flags & i_nopack_mask) {
	151	return 0;
	152	}
bd4c625c LT	153
	154	/* we need to make sure nobody is changing the file size beneath
	155	** us
	156	*/
1b1dcc1b	157	mutex_lock(&inode->i_mutex);
b5f3953c	158	reiserfs_write_lock(inode->i_sb);
bd4c625c LT	159
	160	write_from = inode->i_size & (blocksize - 1);
	161	/* if we are on a block boundary, we are already unpacked. */
	162	if (write_from == 0) {
	163	REISERFS_I(inode)->i_flags \|= i_nopack_mask;
	164	goto out;
	165	}
	166
	167	/* we unpack by finding the page with the tail, and calling
	168	** reiserfs_prepare_write on that page. This will force a
	169	** reiserfs_get_block to unpack the tail for us.
	170	*/
	171	index = inode->i_size >> PAGE_CACHE_SHIFT;
	172	mapping = inode->i_mapping;
	173	page = grab_cache_page(mapping, index);
	174	retval = -ENOMEM;
	175	if (!page) {
	176	goto out;
	177	}
	178	retval =
	179	mapping->a_ops->prepare_write(NULL, page, write_from, write_from);
	180	if (retval)
	181	goto out_unlock;
	182
	183	/* conversion can change page contents, must flush */
	184	flush_dcache_page(page);
	185	retval =
	186	mapping->a_ops->commit_write(NULL, page, write_from, write_from);
1da177e4	187	REISERFS_I(inode)->i_flags \|= i_nopack_mask;
bd4c625c LT	188
	189	out_unlock:
	190	unlock_page(page);
	191	page_cache_release(page);
	192
	193	out:
1b1dcc1b	194	mutex_unlock(&inode->i_mutex);
bd4c625c LT	195	reiserfs_write_unlock(inode->i_sb);
bd4c625c LT	196	return retval;
1da177e4	197	}