[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/mount.h>
#include "reiserfs.h"
#include <linux/time.h>
#include <linux/uaccess.h>
#include <linux/pagemap.h>
#include <linux/compat.h>
#include <linux/fileattr.h>

int reiserfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
{
	struct inode *inode = d_inode(dentry);

	if (!reiserfs_attrs(inode->i_sb))
		return -ENOTTY;

	fileattr_fill_flags(fa, REISERFS_I(inode)->i_attrs);

	return 0;
}

int reiserfs_fileattr_set(struct user_namespace *mnt_userns,
			  struct dentry *dentry, struct fileattr *fa)
{
	struct inode *inode = d_inode(dentry);
	unsigned int flags = fa->flags;
	int err;

	reiserfs_write_lock(inode->i_sb);

	err = -ENOTTY;
	if (!reiserfs_attrs(inode->i_sb))
		goto unlock;

	err = -EOPNOTSUPP;
	if (fileattr_has_fsx(fa))
		goto unlock;

	/*
	 * Is it quota file? Do not allow user to mess with it
	 */
	err = -EPERM;
	if (IS_NOQUOTA(inode))
		goto unlock;

	if ((flags & REISERFS_NOTAIL_FL) && S_ISREG(inode->i_mode)) {
		err = reiserfs_unpack(inode);
		if (err)
			goto unlock;
	}
	sd_attrs_to_i_attrs(flags, inode);
	REISERFS_I(inode)->i_attrs = flags;
	inode->i_ctime = current_time(inode);
	mark_inode_dirty(inode);
	err = 0;
unlock:
	reiserfs_write_unlock(inode->i_sb);

	return err;
}

/*
 * 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 t
 *			      be non-zero)
 *  2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION
 *  3) That's all for a while ...
 */
long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = file_inode(filp);
	int err = 0;

	reiserfs_write_lock(inode->i_sb);

	switch (cmd) {
	case REISERFS_IOC_UNPACK:
		if (S_ISREG(inode->i_mode)) {
			if (arg)
				err = reiserfs_unpack(inode);
		} else
			err = -ENOTTY;
		break;
		/*
		 * following two cases are taken from fs/ext2/ioctl.c by Remy
		 * Card (card@masi.ibp.fr)
		 */
	case REISERFS_IOC_GETVERSION:
		err = put_user(inode->i_generation, (int __user *)arg);
		break;
	case REISERFS_IOC_SETVERSION:
		if (!inode_owner_or_capable(&init_user_ns, inode)) {
			err = -EPERM;
			break;
		}
		err = mnt_want_write_file(filp);
		if (err)
			break;
		if (get_user(inode->i_generation, (int __user *)arg)) {
			err = -EFAULT;
			goto setversion_out;
		}
		inode->i_ctime = current_time(inode);
		mark_inode_dirty(inode);
setversion_out:
		mnt_drop_write_file(filp);
		break;
	default:
		err = -ENOTTY;
	}

	reiserfs_write_unlock(inode->i_sb);

	return err;
}

#ifdef CONFIG_COMPAT
long reiserfs_compat_ioctl(struct file *file, unsigned int cmd,
				unsigned long arg)
{
	/*
	 * 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_GETVERSION:
		cmd = REISERFS_IOC_GETVERSION;
		break;
	case REISERFS_IOC32_SETVERSION:
		cmd = REISERFS_IOC_SETVERSION;
		break;
	default:
		return -ENOIOCTLCMD;
	}

	return reiserfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
}
#endif

int reiserfs_commit_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
 */
int reiserfs_unpack(struct inode *inode)
{
	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 */
	{
		int depth = reiserfs_write_unlock_nested(inode->i_sb);

		inode_lock(inode);
		reiserfs_write_lock_nested(inode->i_sb, depth);
	}

	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_write_begin on that page.  This will force a
	 * reiserfs_get_block to unpack the tail for us.
	 */
	index = inode->i_size >> PAGE_SHIFT;
	mapping = inode->i_mapping;
	page = grab_cache_page(mapping, index);
	retval = -ENOMEM;
	if (!page) {
		goto out;
	}
	retval = __reiserfs_write_begin(page, write_from, 0);
	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);
	put_page(page);

out:
	inode_unlock(inode);
	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>
f466c6fd	8	#include "reiserfs.h"
1da177e4	9	#include <linux/time.h>
17093991	10	#include <linux/uaccess.h>
1da177e4	11	#include <linux/pagemap.h>
52b499c4	12	#include <linux/compat.h>
03eb6066 MS	13	#include <linux/fileattr.h>
	14
	15	int reiserfs_fileattr_get(struct dentry dentry, struct fileattr fa)
	16	{
	17	struct inode *inode = d_inode(dentry);
	18
	19	if (!reiserfs_attrs(inode->i_sb))
	20	return -ENOTTY;
	21
	22	fileattr_fill_flags(fa, REISERFS_I(inode)->i_attrs);
	23
	24	return 0;
	25	}
	26
	27	int reiserfs_fileattr_set(struct user_namespace *mnt_userns,
	28	struct dentry dentry, struct fileattr fa)
	29	{
	30	struct inode *inode = d_inode(dentry);
	31	unsigned int flags = fa->flags;
	32	int err;
	33
	34	reiserfs_write_lock(inode->i_sb);
	35
	36	err = -ENOTTY;
	37	if (!reiserfs_attrs(inode->i_sb))
	38	goto unlock;
	39
	40	err = -EOPNOTSUPP;
	41	if (fileattr_has_fsx(fa))
	42	goto unlock;
	43
	44	/*
	45	* Is it quota file? Do not allow user to mess with it
	46	*/
	47	err = -EPERM;
	48	if (IS_NOQUOTA(inode))
	49	goto unlock;
	50
	51	if ((flags & REISERFS_NOTAIL_FL) && S_ISREG(inode->i_mode)) {
	52	err = reiserfs_unpack(inode);
	53	if (err)
	54	goto unlock;
	55	}
	56	sd_attrs_to_i_attrs(flags, inode);
	57	REISERFS_I(inode)->i_attrs = flags;
	58	inode->i_ctime = current_time(inode);
	59	mark_inode_dirty(inode);
	60	err = 0;
	61	unlock:
	62	reiserfs_write_unlock(inode->i_sb);
	63
	64	return err;
	65	}
1da177e4	66
1da177e4	67	/*
ac78a078 FW	68	* reiserfs_ioctl - handler for ioctl for inode
	69	* supported commands:
	70	* 1) REISERFS_IOC_UNPACK - try to unpack tail from direct item into indirect
098297b2 JM	71	* and prevent packing file (argument arg has t
098297b2 JM	72	* be non-zero)
ac78a078 FW	73	* 2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION
	74	* 3) That's all for a while ...
	75	*/
205cb37b	76	long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1da177e4	77	{
496ad9aa	78	struct inode *inode = file_inode(filp);
42a74f20	79	int err = 0;
1da177e4	80
ac78a078 FW	81	reiserfs_write_lock(inode->i_sb);
ac78a078 FW	82
1da177e4	83	switch (cmd) {
bd4c625c LT	84	case REISERFS_IOC_UNPACK:
	85	if (S_ISREG(inode->i_mode)) {
	86	if (arg)
03eb6066	87	err = reiserfs_unpack(inode);
1da177e4	88	} else
ac78a078 FW	89	err = -ENOTTY;
	90	break;
	91	/*
	92	* following two cases are taken from fs/ext2/ioctl.c by Remy
	93	* Card (card@masi.ibp.fr)
	94	*/
1da177e4	95	case REISERFS_IOC_GETVERSION:
ac78a078 FW	96	err = put_user(inode->i_generation, (int __user *)arg);
ac78a078 FW	97	break;
1da177e4	98	case REISERFS_IOC_SETVERSION:
21cb47be	99	if (!inode_owner_or_capable(&init_user_ns, inode)) {
ac78a078 FW	100	err = -EPERM;
ac78a078 FW	101	break;
e0baec1b	102	}
a561be71	103	err = mnt_want_write_file(filp);
42a74f20	104	if (err)
ac78a078	105	break;
42a74f20 DH	106	if (get_user(inode->i_generation, (int __user *)arg)) {
	107	err = -EFAULT;
	108	goto setversion_out;
	109	}
02027d42	110	inode->i_ctime = current_time(inode);
1da177e4	111	mark_inode_dirty(inode);
42a74f20	112	setversion_out:
2a79f17e	113	mnt_drop_write_file(filp);
ac78a078	114	break;
1da177e4	115	default:
ac78a078	116	err = -ENOTTY;
1da177e4	117	}
ac78a078 FW	118
	119	reiserfs_write_unlock(inode->i_sb);
	120
	121	return err;
1da177e4 LT	122	}
1da177e4 LT	123
52b499c4 DH	124	#ifdef CONFIG_COMPAT
	125	long reiserfs_compat_ioctl(struct file *file, unsigned int cmd,
	126	unsigned long arg)
	127	{
098297b2 JM	128	/*
	129	* These are just misnamed, they actually
	130	* get/put from/to user an int
	131	*/
52b499c4 DH	132	switch (cmd) {
	133	case REISERFS_IOC32_UNPACK:
	134	cmd = REISERFS_IOC_UNPACK;
	135	break;
52b499c4 DH	136	case REISERFS_IOC32_GETVERSION:
	137	cmd = REISERFS_IOC_GETVERSION;
	138	break;
	139	case REISERFS_IOC32_SETVERSION:
	140	cmd = REISERFS_IOC_SETVERSION;
	141	break;
	142	default:
	143	return -ENOIOCTLCMD;
	144	}
8ebc4232	145
205cb37b	146	return reiserfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
52b499c4 DH	147	}
	148	#endif
	149
ba9d8cec VS	150	int reiserfs_commit_write(struct file f, struct page page,
ba9d8cec VS	151	unsigned from, unsigned to);
1da177e4	152	/*
098297b2 JM	153	* reiserfs_unpack
	154	* Function try to convert tail from direct item into indirect.
	155	* It set up nopack attribute in the REISERFS_I(inode)->nopack
	156	*/
03eb6066	157	int reiserfs_unpack(struct inode *inode)
1da177e4	158	{
bd4c625c LT	159	int retval = 0;
	160	int index;
	161	struct page *page;
	162	struct address_space *mapping;
	163	unsigned long write_from;
	164	unsigned long blocksize = inode->i_sb->s_blocksize;
	165
	166	if (inode->i_size == 0) {
	167	REISERFS_I(inode)->i_flags \|= i_nopack_mask;
	168	return 0;
	169	}
	170	/* ioctl already done */
	171	if (REISERFS_I(inode)->i_flags & i_nopack_mask) {
	172	return 0;
	173	}
bd4c625c	174
da905873	175	/* we need to make sure nobody is changing the file size beneath us */
5404e7e0 CIK	176	{
	177	int depth = reiserfs_write_unlock_nested(inode->i_sb);
	178
	179	inode_lock(inode);
	180	reiserfs_write_lock_nested(inode->i_sb, depth);
	181	}
da905873	182
278f6679 JM	183	reiserfs_write_lock(inode->i_sb);
278f6679 JM	184
bd4c625c LT	185	write_from = inode->i_size & (blocksize - 1);
	186	/* if we are on a block boundary, we are already unpacked. */
	187	if (write_from == 0) {
	188	REISERFS_I(inode)->i_flags \|= i_nopack_mask;
	189	goto out;
	190	}
	191
098297b2 JM	192	/*
	193	* we unpack by finding the page with the tail, and calling
	194	* __reiserfs_write_begin on that page. This will force a
	195	* reiserfs_get_block to unpack the tail for us.
bd4c625c	196	*/
09cbfeaf	197	index = inode->i_size >> PAGE_SHIFT;
bd4c625c LT	198	mapping = inode->i_mapping;
	199	page = grab_cache_page(mapping, index);
	200	retval = -ENOMEM;
	201	if (!page) {
	202	goto out;
	203	}
ebdec241	204	retval = __reiserfs_write_begin(page, write_from, 0);
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	212
cf776a7a	213	out_unlock:
bd4c625c	214	unlock_page(page);
09cbfeaf	215	put_page(page);
bd4c625c	216
cf776a7a	217	out:
5955102c	218	inode_unlock(inode);
278f6679	219	reiserfs_write_unlock(inode->i_sb);
bd4c625c	220	return retval;
1da177e4	221	}