[GitHub/LineageOS/android_kernel_motorola_exynos9610.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>

/*
 * 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);
	unsigned int flags;
	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, filp);
		} else
			err = -ENOTTY;
		break;
		/*
		 * 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)) {
			err = -ENOTTY;
			break;
		}

		flags = REISERFS_I(inode)->i_attrs;
		err = put_user(flags, (int __user *)arg);
		break;
	case REISERFS_IOC_SETFLAGS:{
			if (!reiserfs_attrs(inode->i_sb)) {
				err = -ENOTTY;
				break;
			}

			err = mnt_want_write_file(filp);
			if (err)
				break;

			if (!inode_owner_or_capable(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(inode);
			mark_inode_dirty(inode);
setflags_out:
			mnt_drop_write_file(filp);
			break;
		}
	case REISERFS_IOC_GETVERSION:
		err = put_user(inode->i_generation, (int __user *)arg);
		break;
	case REISERFS_IOC_SETVERSION:
		if (!inode_owner_or_capable(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_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;
	}

	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, 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 */
{
	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
	1	/*
	2	* Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
	3	*/
	4
	5	#include <linux/capability.h>
	6	#include <linux/fs.h>
	7	#include <linux/mount.h>
	8	#include "reiserfs.h"
	9	#include <linux/time.h>
	10	#include <linux/uaccess.h>
	11	#include <linux/pagemap.h>
	12	#include <linux/compat.h>
	13
	14	/*
	15	* reiserfs_ioctl - handler for ioctl for inode
	16	* supported commands:
	17	* 1) REISERFS_IOC_UNPACK - try to unpack tail from direct item into indirect
	18	* and prevent packing file (argument arg has t
	19	* be non-zero)
	20	* 2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION
	21	* 3) That's all for a while ...
	22	*/
	23	long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
	24	{
	25	struct inode *inode = file_inode(filp);
	26	unsigned int flags;
	27	int err = 0;
	28
	29	reiserfs_write_lock(inode->i_sb);
	30
	31	switch (cmd) {
	32	case REISERFS_IOC_UNPACK:
	33	if (S_ISREG(inode->i_mode)) {
	34	if (arg)
	35	err = reiserfs_unpack(inode, filp);
	36	} else
	37	err = -ENOTTY;
	38	break;
	39	/*
	40	* following two cases are taken from fs/ext2/ioctl.c by Remy
	41	* Card (card@masi.ibp.fr)
	42	*/
	43	case REISERFS_IOC_GETFLAGS:
	44	if (!reiserfs_attrs(inode->i_sb)) {
	45	err = -ENOTTY;
	46	break;
	47	}
	48
	49	flags = REISERFS_I(inode)->i_attrs;
	50	err = put_user(flags, (int __user *)arg);
	51	break;
	52	case REISERFS_IOC_SETFLAGS:{
	53	if (!reiserfs_attrs(inode->i_sb)) {
	54	err = -ENOTTY;
	55	break;
	56	}
	57
	58	err = mnt_want_write_file(filp);
	59	if (err)
	60	break;
	61
	62	if (!inode_owner_or_capable(inode)) {
	63	err = -EPERM;
	64	goto setflags_out;
	65	}
	66	if (get_user(flags, (int __user *)arg)) {
	67	err = -EFAULT;
	68	goto setflags_out;
	69	}
	70	/*
	71	* Is it quota file? Do not allow user to mess with it
	72	*/
	73	if (IS_NOQUOTA(inode)) {
	74	err = -EPERM;
	75	goto setflags_out;
	76	}
	77	if (((flags ^ REISERFS_I(inode)->
	78	i_attrs) & (REISERFS_IMMUTABLE_FL \|
	79	REISERFS_APPEND_FL))
	80	&& !capable(CAP_LINUX_IMMUTABLE)) {
	81	err = -EPERM;
	82	goto setflags_out;
	83	}
	84	if ((flags & REISERFS_NOTAIL_FL) &&
	85	S_ISREG(inode->i_mode)) {
	86	int result;
	87
	88	result = reiserfs_unpack(inode, filp);
	89	if (result) {
	90	err = result;
	91	goto setflags_out;
	92	}
	93	}
	94	sd_attrs_to_i_attrs(flags, inode);
	95	REISERFS_I(inode)->i_attrs = flags;
	96	inode->i_ctime = current_time(inode);
	97	mark_inode_dirty(inode);
	98	setflags_out:
	99	mnt_drop_write_file(filp);
	100	break;
	101	}
	102	case REISERFS_IOC_GETVERSION:
	103	err = put_user(inode->i_generation, (int __user *)arg);
	104	break;
	105	case REISERFS_IOC_SETVERSION:
	106	if (!inode_owner_or_capable(inode)) {
	107	err = -EPERM;
	108	break;
	109	}
	110	err = mnt_want_write_file(filp);
	111	if (err)
	112	break;
	113	if (get_user(inode->i_generation, (int __user *)arg)) {
	114	err = -EFAULT;
	115	goto setversion_out;
	116	}
	117	inode->i_ctime = current_time(inode);
	118	mark_inode_dirty(inode);
	119	setversion_out:
	120	mnt_drop_write_file(filp);
	121	break;
	122	default:
	123	err = -ENOTTY;
	124	}
	125
	126	reiserfs_write_unlock(inode->i_sb);
	127
	128	return err;
	129	}
	130
	131	#ifdef CONFIG_COMPAT
	132	long reiserfs_compat_ioctl(struct file *file, unsigned int cmd,
	133	unsigned long arg)
	134	{
	135	/*
	136	* These are just misnamed, they actually
	137	* get/put from/to user an int
	138	*/
	139	switch (cmd) {
	140	case REISERFS_IOC32_UNPACK:
	141	cmd = REISERFS_IOC_UNPACK;
	142	break;
	143	case REISERFS_IOC32_GETFLAGS:
	144	cmd = REISERFS_IOC_GETFLAGS;
	145	break;
	146	case REISERFS_IOC32_SETFLAGS:
	147	cmd = REISERFS_IOC_SETFLAGS;
	148	break;
	149	case REISERFS_IOC32_GETVERSION:
	150	cmd = REISERFS_IOC_GETVERSION;
	151	break;
	152	case REISERFS_IOC32_SETVERSION:
	153	cmd = REISERFS_IOC_SETVERSION;
	154	break;
	155	default:
	156	return -ENOIOCTLCMD;
	157	}
	158
	159	return reiserfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
	160	}
	161	#endif
	162
	163	int reiserfs_commit_write(struct file f, struct page page,
	164	unsigned from, unsigned to);
	165	/*
	166	* reiserfs_unpack
	167	* Function try to convert tail from direct item into indirect.
	168	* It set up nopack attribute in the REISERFS_I(inode)->nopack
	169	*/
	170	int reiserfs_unpack(struct inode inode, struct file filp)
	171	{
	172	int retval = 0;
	173	int index;
	174	struct page *page;
	175	struct address_space *mapping;
	176	unsigned long write_from;
	177	unsigned long blocksize = inode->i_sb->s_blocksize;
	178
	179	if (inode->i_size == 0) {
	180	REISERFS_I(inode)->i_flags \|= i_nopack_mask;
	181	return 0;
	182	}
	183	/* ioctl already done */
	184	if (REISERFS_I(inode)->i_flags & i_nopack_mask) {
	185	return 0;
	186	}
	187
	188	/* we need to make sure nobody is changing the file size beneath us */
	189	{
	190	int depth = reiserfs_write_unlock_nested(inode->i_sb);
	191	inode_lock(inode);
	192	reiserfs_write_lock_nested(inode->i_sb, depth);
	193	}
	194
	195	reiserfs_write_lock(inode->i_sb);
	196
	197	write_from = inode->i_size & (blocksize - 1);
	198	/* if we are on a block boundary, we are already unpacked. */
	199	if (write_from == 0) {
	200	REISERFS_I(inode)->i_flags \|= i_nopack_mask;
	201	goto out;
	202	}
	203
	204	/*
	205	* we unpack by finding the page with the tail, and calling
	206	* __reiserfs_write_begin on that page. This will force a
	207	* reiserfs_get_block to unpack the tail for us.
	208	*/
	209	index = inode->i_size >> PAGE_SHIFT;
	210	mapping = inode->i_mapping;
	211	page = grab_cache_page(mapping, index);
	212	retval = -ENOMEM;
	213	if (!page) {
	214	goto out;
	215	}
	216	retval = __reiserfs_write_begin(page, write_from, 0);
	217	if (retval)
	218	goto out_unlock;
	219
	220	/* conversion can change page contents, must flush */
	221	flush_dcache_page(page);
	222	retval = reiserfs_commit_write(NULL, page, write_from, write_from);
	223	REISERFS_I(inode)->i_flags \|= i_nopack_mask;
	224
	225	out_unlock:
	226	unlock_page(page);
	227	put_page(page);
	228
	229	out:
	230	inode_unlock(inode);
	231	reiserfs_write_unlock(inode->i_sb);
	232	return retval;
	233	}