[net-next-2.6.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/mount.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;
	int err = 0;

	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;

			err = mnt_want_write(filp->f_path.mnt);
			if (err)
				return err;

			if (!is_owner_or_cap(inode)) {
				err = -EPERM;
				goto setflags_out;
			}
			if (get_user(flags, (int __user *)arg)) {
				err = -EFAULT;
				goto setflags_out;
			}
			/*
			 * Is it quota file? Do not allow user to mess with it
			 */
			if (IS_NOQUOTA(inode)) {
				err = -EPERM;
				goto setflags_out;
			}
			if (((flags ^ REISERFS_I(inode)->
			      i_attrs) & (REISERFS_IMMUTABLE_FL |
					  REISERFS_APPEND_FL))
			    && !capable(CAP_LINUX_IMMUTABLE)) {
				err = -EPERM;
				goto setflags_out;
			}
			if ((flags & REISERFS_NOTAIL_FL) &&
			    S_ISREG(inode->i_mode)) {
				int result;

				result = reiserfs_unpack(inode, filp);
				if (result) {
					err = result;
					goto setflags_out;
				}
			}
			sd_attrs_to_i_attrs(flags, inode);
			REISERFS_I(inode)->i_attrs = flags;
			inode->i_ctime = CURRENT_TIME_SEC;
			mark_inode_dirty(inode);
setflags_out:
			mnt_drop_write(filp->f_path.mnt);
			return err;
		}
	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;
		err = mnt_want_write(filp->f_path.mnt);
		if (err)
			return err;
		if (get_user(inode->i_generation, (int __user *)arg)) {
			err = -EFAULT;
			goto setversion_out;
		}
		inode->i_ctime = CURRENT_TIME_SEC;
		mark_inode_dirty(inode);
setversion_out:
		mnt_drop_write(filp->f_path.mnt);
		return err;
	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

int reiserfs_commit_write(struct file *f, struct page *page,
			  unsigned from, unsigned to);
int reiserfs_prepare_write(struct file *f, struct page *page,
			   unsigned from, unsigned to);
/*
** 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 = reiserfs_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 = reiserfs_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	6	#include <linux/fs.h>
42a74f20	7	#include <linux/mount.h>
1da177e4 LT	8	#include <linux/reiserfs_fs.h>
	9	#include <linux/time.h>
	10	#include <asm/uaccess.h>
	11	#include <linux/pagemap.h>
	12	#include <linux/smp_lock.h>
52b499c4	13	#include <linux/compat.h>
1da177e4	14
bd4c625c	15	static int reiserfs_unpack(struct inode inode, struct file filp);
1da177e4 LT	16
	17	/*
	18	** reiserfs_ioctl - handler for ioctl for inode
	19	** supported commands:
	20	** 1) REISERFS_IOC_UNPACK - try to unpack tail from direct item into indirect
	21	** and prevent packing file (argument arg has to be non-zero)
	22	** 2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION
	23	** 3) That's all for a while ...
	24	*/
bd4c625c LT	25	int reiserfs_ioctl(struct inode inode, struct file filp, unsigned int cmd,
bd4c625c LT	26	unsigned long arg)
1da177e4 LT	27	{
1da177e4 LT	28	unsigned int flags;
42a74f20	29	int err = 0;
1da177e4 LT	30
1da177e4 LT	31	switch (cmd) {
bd4c625c LT	32	case REISERFS_IOC_UNPACK:
	33	if (S_ISREG(inode->i_mode)) {
	34	if (arg)
	35	return reiserfs_unpack(inode, filp);
1da177e4 LT	36	else
	37	return 0;
	38	} else
	39	return -ENOTTY;
bd4c625c LT	40	/* following two cases are taken from fs/ext2/ioctl.c by Remy
bd4c625c LT	41	Card (card@masi.ibp.fr) */
1da177e4	42	case REISERFS_IOC_GETFLAGS:
bd4c625c	43	if (!reiserfs_attrs(inode->i_sb))
869eb76e JM	44	return -ENOTTY;
869eb76e JM	45
bd4c625c LT	46	flags = REISERFS_I(inode)->i_attrs;
	47	i_attrs_to_sd_attrs(inode, (__u16 *) & flags);
	48	return put_user(flags, (int __user *)arg);
	49	case REISERFS_IOC_SETFLAGS:{
	50	if (!reiserfs_attrs(inode->i_sb))
	51	return -ENOTTY;
869eb76e	52
42a74f20 DH	53	err = mnt_want_write(filp->f_path.mnt);
	54	if (err)
	55	return err;
1da177e4	56
42a74f20 DH	57	if (!is_owner_or_cap(inode)) {
	58	err = -EPERM;
	59	goto setflags_out;
	60	}
	61	if (get_user(flags, (int __user *)arg)) {
	62	err = -EFAULT;
	63	goto setflags_out;
	64	}
	65	/*
	66	* Is it quota file? Do not allow user to mess with it
	67	*/
	68	if (IS_NOQUOTA(inode)) {
	69	err = -EPERM;
	70	goto setflags_out;
	71	}
bd4c625c LT	72	if (((flags ^ REISERFS_I(inode)->
	73	i_attrs) & (REISERFS_IMMUTABLE_FL \|
	74	REISERFS_APPEND_FL))
42a74f20 DH	75	&& !capable(CAP_LINUX_IMMUTABLE)) {
	76	err = -EPERM;
	77	goto setflags_out;
	78	}
bd4c625c LT	79	if ((flags & REISERFS_NOTAIL_FL) &&
bd4c625c LT	80	S_ISREG(inode->i_mode)) {
1da177e4 LT	81	int result;
1da177e4 LT	82
bd4c625c	83	result = reiserfs_unpack(inode, filp);
42a74f20 DH	84	if (result) {
	85	err = result;
	86	goto setflags_out;
	87	}
bd4c625c LT	88	}
	89	sd_attrs_to_i_attrs(flags, inode);
	90	REISERFS_I(inode)->i_attrs = flags;
	91	inode->i_ctime = CURRENT_TIME_SEC;
	92	mark_inode_dirty(inode);
42a74f20 DH	93	setflags_out:
	94	mnt_drop_write(filp->f_path.mnt);
	95	return err;
1da177e4	96	}
1da177e4	97	case REISERFS_IOC_GETVERSION:
bd4c625c	98	return put_user(inode->i_generation, (int __user *)arg);
1da177e4	99	case REISERFS_IOC_SETVERSION:
3bd858ab	100	if (!is_owner_or_cap(inode))
1da177e4	101	return -EPERM;
42a74f20 DH	102	err = mnt_want_write(filp->f_path.mnt);
	103	if (err)
	104	return err;
	105	if (get_user(inode->i_generation, (int __user *)arg)) {
	106	err = -EFAULT;
	107	goto setversion_out;
	108	}
1da177e4 LT	109	inode->i_ctime = CURRENT_TIME_SEC;
1da177e4 LT	110	mark_inode_dirty(inode);
42a74f20 DH	111	setversion_out:
	112	mnt_drop_write(filp->f_path.mnt);
	113	return err;
1da177e4 LT	114	default:
	115	return -ENOTTY;
	116	}
	117	}
	118
52b499c4 DH	119	#ifdef CONFIG_COMPAT
	120	long reiserfs_compat_ioctl(struct file *file, unsigned int cmd,
	121	unsigned long arg)
	122	{
1fc5adbd	123	struct inode *inode = file->f_path.dentry->d_inode;
52b499c4 DH	124	int ret;
	125
	126	/* These are just misnamed, they actually get/put from/to user an int */
	127	switch (cmd) {
	128	case REISERFS_IOC32_UNPACK:
	129	cmd = REISERFS_IOC_UNPACK;
	130	break;
	131	case REISERFS_IOC32_GETFLAGS:
	132	cmd = REISERFS_IOC_GETFLAGS;
	133	break;
	134	case REISERFS_IOC32_SETFLAGS:
	135	cmd = REISERFS_IOC_SETFLAGS;
	136	break;
	137	case REISERFS_IOC32_GETVERSION:
	138	cmd = REISERFS_IOC_GETVERSION;
	139	break;
	140	case REISERFS_IOC32_SETVERSION:
	141	cmd = REISERFS_IOC_SETVERSION;
	142	break;
	143	default:
	144	return -ENOIOCTLCMD;
	145	}
	146	lock_kernel();
	147	ret = reiserfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
	148	unlock_kernel();
	149	return ret;
	150	}
	151	#endif
	152
ba9d8cec VS	153	int reiserfs_commit_write(struct file f, struct page page,
	154	unsigned from, unsigned to);
	155	int reiserfs_prepare_write(struct file f, struct page page,
	156	unsigned from, unsigned to);
1da177e4 LT	157	/*
	158	** reiserfs_unpack
	159	** Function try to convert tail from direct item into indirect.
	160	** It set up nopack attribute in the REISERFS_I(inode)->nopack
	161	*/
bd4c625c	162	static int reiserfs_unpack(struct inode inode, struct file filp)
1da177e4	163	{
bd4c625c LT	164	int retval = 0;
	165	int index;
	166	struct page *page;
	167	struct address_space *mapping;
	168	unsigned long write_from;
	169	unsigned long blocksize = inode->i_sb->s_blocksize;
	170
	171	if (inode->i_size == 0) {
	172	REISERFS_I(inode)->i_flags \|= i_nopack_mask;
	173	return 0;
	174	}
	175	/* ioctl already done */
	176	if (REISERFS_I(inode)->i_flags & i_nopack_mask) {
	177	return 0;
	178	}
bd4c625c LT	179
	180	/* we need to make sure nobody is changing the file size beneath
	181	** us
	182	*/
1b1dcc1b	183	mutex_lock(&inode->i_mutex);
b5f3953c	184	reiserfs_write_lock(inode->i_sb);
bd4c625c LT	185
	186	write_from = inode->i_size & (blocksize - 1);
	187	/* if we are on a block boundary, we are already unpacked. */
	188	if (write_from == 0) {
	189	REISERFS_I(inode)->i_flags \|= i_nopack_mask;
	190	goto out;
	191	}
	192
	193	/* we unpack by finding the page with the tail, and calling
	194	** reiserfs_prepare_write on that page. This will force a
	195	** reiserfs_get_block to unpack the tail for us.
	196	*/
	197	index = inode->i_size >> PAGE_CACHE_SHIFT;
	198	mapping = inode->i_mapping;
	199	page = grab_cache_page(mapping, index);
	200	retval = -ENOMEM;
	201	if (!page) {
	202	goto out;
	203	}
ba9d8cec	204	retval = reiserfs_prepare_write(NULL, page, write_from, write_from);
bd4c625c LT	205	if (retval)
	206	goto out_unlock;
	207
	208	/* conversion can change page contents, must flush */
	209	flush_dcache_page(page);
ba9d8cec	210	retval = reiserfs_commit_write(NULL, page, write_from, write_from);
1da177e4	211	REISERFS_I(inode)->i_flags \|= i_nopack_mask;
bd4c625c LT	212
	213	out_unlock:
	214	unlock_page(page);
	215	page_cache_release(page);
	216
	217	out:
1b1dcc1b	218	mutex_unlock(&inode->i_mutex);
bd4c625c LT	219	reiserfs_write_unlock(inode->i_sb);
bd4c625c LT	220	return retval;
1da177e4	221	}