cregit-Linux how code gets into the kernel

Release 4.14 drivers/mtd/mtdchar.c

Directory: drivers/mtd
/*
 * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include <linux/device.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/mutex.h>
#include <linux/backing-dev.h>
#include <linux/compat.h>
#include <linux/mount.h>
#include <linux/blkpg.h>
#include <linux/magic.h>
#include <linux/major.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/map.h>

#include <linux/uaccess.h>

#include "mtdcore.h"

static DEFINE_MUTEX(mtd_mutex);

/*
 * Data structure to hold the pointer to the mtd device as well
 * as mode information of various use cases.
 */

struct mtd_file_info {
	
struct mtd_info *mtd;
	
enum mtd_file_modes mode;
};




static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig)
{
	struct mtd_file_info *mfi = file->private_data;
	return fixed_size_llseek(file, offset, orig, mfi->mtd->size);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1740.48%116.67%


Al Viro921.43%116.67%


Thomas Gleixner819.05%116.67%


Linus Torvalds614.29%116.67%


Todd Android Poynor12.38%116.67%


Artem B. Bityutskiy12.38%116.67%


Total42100.00%6100.00%






static int mtdchar_open(struct inode *inode, struct file *file)
{
	int minor = iminor(inode);
	int devnum = minor >> 1;
	int ret = 0;
	struct mtd_info *mtd;
	struct mtd_file_info *mfi;

	pr_debug("MTD_open\n");

	/* You can't open the RO devices RW */
	if ((file->f_mode & FMODE_WRITE) && (minor & 1))
		return -EACCES;

	mutex_lock(&mtd_mutex);
	mtd = get_mtd_device(NULL, devnum);

	if (IS_ERR(mtd)) {
		ret = PTR_ERR(mtd);
		goto out;
	}

	if (mtd->type == MTD_ABSENT) {
		ret = -ENODEV;
		goto out1;
	}

	/* You can't open it RW if it's not a writeable device */
	if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
		ret = -EACCES;
		goto out1;
	}

	mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
	if (!mfi) {
		ret = -ENOMEM;
		goto out1;
	}
	mfi->mtd = mtd;
	file->private_data = mfi;
	mutex_unlock(&mtd_mutex);
	return 0;

out1:
	put_mtd_device(mtd);
out:
	mutex_unlock(&mtd_mutex);
	return ret;
} 
Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)9643.44%17.69%


Thomas Gleixner3917.65%17.69%


Jonathan Corbet3314.93%17.69%


Al Viro209.05%323.08%


Linus Torvalds104.52%17.69%


Arnd Bergmann104.52%17.69%


Artem B. Bityutskiy83.62%215.38%


Christoph Hellwig20.90%17.69%


David Howells20.90%17.69%


Brian Norris10.45%17.69%


Total221100.00%13100.00%



/* mtdchar_open */

/*====================================================================*/




static int mtdchar_close(struct inode *inode, struct file *file)
{
	struct mtd_file_info *mfi = file->private_data;
	struct mtd_info *mtd = mfi->mtd;

	pr_debug("MTD_close\n");

	/* Only sync if opened RW */
	if ((file->f_mode & FMODE_WRITE))
		mtd_sync(mtd);

	put_mtd_device(mtd);
	file->private_data = NULL;
	kfree(mfi);

	return 0;
} 
Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3648.65%112.50%


Thomas Gleixner2432.43%112.50%


Joakim Tjernlund79.46%112.50%


Linus Torvalds34.05%112.50%


Artem B. Bityutskiy22.70%225.00%


Brian Norris11.35%112.50%


Al Viro11.35%112.50%


Total74100.00%8100.00%



/* mtdchar_close */

/* Back in June 2001, dwmw2 wrote:
 *
 *   FIXME: This _really_ needs to die. In 2.5, we should lock the
 *   userspace buffer down and use it directly with readv/writev.
 *
 * The implementation below, using mtd_kmalloc_up_to, mitigates
 * allocation failures when the system is under low-memory situations
 * or if memory is highly fragmented at the cost of reducing the
 * performance of the requested transfer due to a smaller buffer size.
 *
 * A more complex but more memory-efficient implementation based on
 * get_user_pages and iovecs to cover extents of those pages is a
 * longer-term goal, as intimated by dwmw2 above. However, for the
 * write case, this requires yet more complex head and tail transfer
 * handling when those head and tail offsets and sizes are such that
 * alignment requirements are not met in the NAND subdriver.
 */




static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
			loff_t *ppos)
{
	struct mtd_file_info *mfi = file->private_data;
	struct mtd_info *mtd = mfi->mtd;
	size_t retlen;
	size_t total_retlen=0;
	int ret=0;
	int len;
	size_t size = count;
	char *kbuf;

	pr_debug("MTD_read\n");

	if (*ppos + count > mtd->size)
		count = mtd->size - *ppos;

	if (!count)
		return 0;

	kbuf = mtd_kmalloc_up_to(mtd, &size);
	if (!kbuf)
		return -ENOMEM;

	while (count) {
		len = min_t(size_t, count, size);

		switch (mfi->mode) {
		case MTD_FILE_MODE_OTP_FACTORY:
			ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
						     &retlen, kbuf);
			break;
		case MTD_FILE_MODE_OTP_USER:
			ret = mtd_read_user_prot_reg(mtd, *ppos, len,
						     &retlen, kbuf);
			break;
		case MTD_FILE_MODE_RAW:
		{
			struct mtd_oob_ops ops;

			ops.mode = MTD_OPS_RAW;
			ops.datbuf = kbuf;
			ops.oobbuf = NULL;
			ops.len = len;

			ret = mtd_read_oob(mtd, *ppos, &ops);
			retlen = ops.retlen;
			break;
		}
		default:
			ret = mtd_read(mtd, *ppos, len, &retlen, kbuf);
		}
		/* Nand returns -EBADMSG on ECC errors, but it returns
                 * the data. For our userspace tools it is important
                 * to dump areas with ECC errors!
                 * For kernel internal usage it also might return -EUCLEAN
                 * to signal the caller that a bitflip has occurred and has
                 * been corrected by the ECC algorithm.
                 * Userspace software which accesses NAND this way
                 * must be aware of the fact that it deals with NAND
                 */
		if (!ret || mtd_is_bitflip_or_eccerr(ret)) {
			*ppos += retlen;
			if (copy_to_user(buf, kbuf, retlen)) {
				kfree(kbuf);
				return -EFAULT;
			}
			else
				total_retlen += retlen;

			count -= retlen;
			buf += retlen;
			if (retlen == 0)
				count = 0;
		}
		else {
			kfree(kbuf);
			return ret;
		}

	}

	kfree(kbuf);
	return total_retlen;
} 
Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)11534.02%15.00%


Thomas Gleixner6719.82%315.00%


Linus Torvalds5917.46%210.00%


Nico Pitre5415.98%15.00%


Grant Erickson164.73%15.00%


Thiago Galesi123.55%15.00%


Brian Norris92.66%525.00%


Artem B. Bityutskiy51.48%525.00%


Al Viro10.30%15.00%


Total338100.00%20100.00%



/* mtdchar_read */




static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count,
			loff_t *ppos)
{
	struct mtd_file_info *mfi = file->private_data;
	struct mtd_info *mtd = mfi->mtd;
	size_t size = count;
	char *kbuf;
	size_t retlen;
	size_t total_retlen=0;
	int ret=0;
	int len;

	pr_debug("MTD_write\n");

	if (*ppos == mtd->size)
		return -ENOSPC;

	if (*ppos + count > mtd->size)
		count = mtd->size - *ppos;

	if (!count)
		return 0;

	kbuf = mtd_kmalloc_up_to(mtd, &size);
	if (!kbuf)
		return -ENOMEM;

	while (count) {
		len = min_t(size_t, count, size);

		if (copy_from_user(kbuf, buf, len)) {
			kfree(kbuf);
			return -EFAULT;
		}

		switch (mfi->mode) {
		case MTD_FILE_MODE_OTP_FACTORY:
			ret = -EROFS;
			break;
		case MTD_FILE_MODE_OTP_USER:
			ret = mtd_write_user_prot_reg(mtd, *ppos, len,
						      &retlen, kbuf);
			break;

		case MTD_FILE_MODE_RAW:
		{
			struct mtd_oob_ops ops;

			ops.mode = MTD_OPS_RAW;
			ops.datbuf = kbuf;
			ops.oobbuf = NULL;
			ops.ooboffs = 0;
			ops.len = len;

			ret = mtd_write_oob(mtd, *ppos, &ops);
			retlen = ops.retlen;
			break;
		}

		default:
			ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
		}

		/*
                 * Return -ENOSPC only if no data could be written at all.
                 * Otherwise just return the number of bytes that actually
                 * have been written.
                 */
		if ((ret == -ENOSPC) && (total_retlen))
			break;

		if (!ret) {
			*ppos += retlen;
			total_retlen += retlen;
			count -= retlen;
			buf += retlen;
		}
		else {
			kfree(kbuf);
			return ret;
		}
	}

	kfree(kbuf);
	return total_retlen;
} 
Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)12937.50%15.88%


Thomas Gleixner6518.90%15.88%


Linus Torvalds5415.70%211.76%


Nico Pitre339.59%15.88%


Grant Erickson164.65%15.88%


Christian Riesch154.36%15.88%


Artem B. Bityutskiy102.91%423.53%


Thiago Galesi102.91%15.88%


Peter Wippich61.74%15.88%


Brian Norris51.45%317.65%


Al Viro10.29%15.88%


Total344100.00%17100.00%



/* mtdchar_write */

/*======================================================================

    IOCTL calls for getting device parameters.

======================================================================*/



static void mtdchar_erase_callback (struct erase_info *instr)
{
	wake_up((wait_queue_head_t *)instr->priv);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2195.45%150.00%


David Woodhouse14.55%150.00%


Total22100.00%2100.00%






static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
{
	struct mtd_info *mtd = mfi->mtd;
	size_t retlen;

	switch (mode) {
	case MTD_OTP_FACTORY:
		if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) ==
				-EOPNOTSUPP)
			return -EOPNOTSUPP;

		mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
		break;
	case MTD_OTP_USER:
		if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) ==
				-EOPNOTSUPP)
			return -EOPNOTSUPP;

		mfi->mode = MTD_FILE_MODE_OTP_USER;
		break;
	case MTD_OTP_OFF:
		mfi->mode = MTD_FILE_MODE_NORMAL;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Thomas Gleixner4538.14%120.00%


Uwe Kleine-König4437.29%120.00%


Artem B. Bityutskiy2622.03%120.00%


Brian Norris21.69%120.00%


Will Newton10.85%120.00%


Total118100.00%5100.00%






static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
	uint64_t start, uint32_t length, void __user *ptr,
	uint32_t __user *retp)
{
	struct mtd_file_info *mfi = file->private_data;
	struct mtd_oob_ops ops;
	uint32_t retlen;
	int ret = 0;

	if (!(file->f_mode & FMODE_WRITE))
		return -EPERM;

	if (length > 4096)
		return -EINVAL;

	if (!mtd->_write_oob)
		ret = -EOPNOTSUPP;
	else
		ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;

	if (ret)
		return ret;

	ops.ooblen = length;
	ops.ooboffs = start & (mtd->writesize - 1);
	ops.datbuf = NULL;
	ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
		MTD_OPS_PLACE_OOB;

	if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
		return -EINVAL;

	ops.oobbuf = memdup_user(ptr, length);
	if (IS_ERR(ops.oobbuf))
		return PTR_ERR(ops.oobbuf);

	start &= ~((uint64_t)mtd->writesize - 1);
	ret = mtd_write_oob(mtd, start, &ops);

	if (ops.oobretlen > 0xFFFFFFFFU)
		ret = -EOVERFLOW;
	retlen = ops.oobretlen;
	if (copy_to_user(retp, &retlen, sizeof(length)))
		ret = -EFAULT;

	kfree(ops.oobbuf);
	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
Kevin Cernekee17862.90%16.25%


Linus Torvalds (pre-git)3311.66%16.25%


Brian Norris227.77%425.00%


Linus Torvalds207.07%16.25%


Jesper Juhl72.47%16.25%


Zev Weiss72.47%16.25%


Julia Lawall62.12%16.25%


Al Viro51.77%16.25%


Artem B. Bityutskiy31.06%318.75%


Thomas Gleixner10.35%16.25%


Roel Kluin10.35%16.25%


Total283100.00%16100.00%






static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
	uint64_t start, uint32_t length, void __user *ptr,
	uint32_t __user *retp)
{
	struct mtd_file_info *mfi = file->private_data;
	struct mtd_oob_ops ops;
	int ret = 0;

	if (length > 4096)
		return -EINVAL;

	if (!access_ok(VERIFY_WRITE, ptr, length))
		return -EFAULT;

	ops.ooblen = length;
	ops.ooboffs = start & (mtd->writesize - 1);
	ops.datbuf = NULL;
	ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
		MTD_OPS_PLACE_OOB;

	if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
		return -EINVAL;

	ops.oobbuf = kmalloc(length, GFP_KERNEL);
	if (!ops.oobbuf)
		return -ENOMEM;

	start &= ~((uint64_t)mtd->writesize - 1);
	ret = mtd_read_oob(mtd, start, &ops);

	if (put_user(ops.oobretlen, retp))
		ret = -EFAULT;
	else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
					    ops.oobretlen))
		ret = -EFAULT;

	kfree(ops.oobbuf);

	/*
         * NAND returns -EBADMSG on ECC errors, but it returns the OOB
         * data. For our userspace tools it is important to dump areas
         * with ECC errors!
         * For kernel internal usage it also might return -EUCLEAN
         * to signal the caller that a bitflip has occurred and has
         * been corrected by the ECC algorithm.
         *
         * Note: currently the standard NAND function, nand_read_oob_std,
         * does not calculate ECC for the OOB area, so do not rely on
         * this behavior unless you have replaced it with your own.
         */
	if (mtd_is_bitflip_or_eccerr(ret))
		return 0;

	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
Kevin Cernekee17569.44%16.67%


Brian Norris3714.68%640.00%


Jörn Engel228.73%16.67%


Linus Torvalds (pre-git)114.37%213.33%


Artem B. Bityutskiy62.38%426.67%


Nobuhiro Iwamatsu10.40%16.67%


Total252100.00%15100.00%



/*
 * Copies (and truncates, if necessary) OOB layout information to the
 * deprecated layout struct, nand_ecclayout_user. This is necessary only to
 * support the deprecated API ioctl ECCGETLAYOUT while allowing all new
 * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops
 * can describe any kind of OOB layout with almost zero overhead from a
 * memory usage point of view).
 */



static int shrink_ecclayout(struct mtd_info *mtd,
			    struct nand_ecclayout_user *to)
{
	struct mtd_oob_region oobregion;
	int i, section = 0, ret;

	if (!mtd || !to)
		return -EINVAL;

	memset(to, 0, sizeof(*to));

	to->eccbytes = 0;
	for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) {
		u32 eccpos;

		ret = mtd_ooblayout_ecc(mtd, section, &oobregion);
		if (ret < 0) {
			if (ret != -ERANGE)
				return ret;

			break;
		}

		eccpos = oobregion.offset;
		for (; i < MTD_MAX_ECCPOS_ENTRIES &&
		       eccpos < oobregion.offset + oobregion.length; i++) {
			to->eccpos[i] = eccpos++;
			to->eccbytes++;
		}
	}

	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
		ret = mtd_ooblayout_free(mtd, i, &oobregion);
		if (ret < 0) {
			if (ret != -ERANGE)
				return ret;

			break;
		}

		to->oobfree[i].offset = oobregion.offset;
		to->oobfree[i].length = oobregion.length;
		to->oobavail += to->oobfree[i].length;
	}

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Boris Brezillon13255.46%150.00%


Brian Norris10644.54%150.00%


Total238100.00%2100.00%






static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
{
	struct mtd_oob_region oobregion;
	int i, section = 0, ret;

	if (!mtd || !to)
		return -EINVAL;

	memset(to, 0, sizeof(*to));

	to->eccbytes = 0;
	for (i = 0; i < ARRAY_SIZE(to->eccpos);) {
		u32 eccpos;

		ret = mtd_ooblayout_ecc(mtd, section, &oobregion);
		if (ret < 0) {
			if (ret != -ERANGE)
				return ret;

			break;
		}

		if (oobregion.length + i > ARRAY_SIZE(to->eccpos))
			return -EINVAL;

		eccpos = oobregion.offset;
		for (; eccpos < oobregion.offset + oobregion.length; i++) {
			to->eccpos[i] = eccpos++;
			to->eccbytes++;
		}
	}

	for (i = 0; i < 8; i++) {
		ret = mtd_ooblayout_free(mtd, i, &oobregion);
		if (ret < 0) {
			if (ret != -ERANGE)
				return ret;

			break;
		}

		to->oobfree[i][0] = oobregion.offset;
		to->oobfree[i][1] = oobregion.length;
	}

	to->useecc = MTD_NANDECC_AUTOPLACE;

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Boris Brezillon23592.89%150.00%


Brian Norris187.11%150.00%


Total253100.00%2100.00%






static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
			       struct blkpg_ioctl_arg *arg)
{
	struct blkpg_partition p;

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

	if (copy_from_user(&p, arg->data, sizeof(p)))
		return -EFAULT;

	switch (arg->op) {
	case BLKPG_ADD_PARTITION:

		/* Only master mtd device must be used to add partitions */
		if (mtd_is_partition(mtd))
			return -EINVAL;

		/* Sanitize user input */
		p.devname[BLKPG_DEVNAMELTH - 1] = '\0';

		return mtd_add_partition(mtd, p.devname, p.start, p.length);

	case BLKPG_DEL_PARTITION:

		if (p.pno < 0)
			return -EINVAL;

		return mtd_del_partition(mtd, p.pno);

	default:
		return -EINVAL;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Roman Tereshonkov11886.76%240.00%


Brian Norris1712.50%240.00%


Artem B. Bityutskiy10.74%120.00%


Total136100.00%5100.00%






static int mtdchar_write_ioctl(struct mtd_info *mtd,
		struct mtd_write_req __user *argp)
{
	struct mtd_write_req req;
	struct mtd_oob_ops ops;
	const void __user *usr_data, *usr_oob;
	int ret;

	if (copy_from_user(&req, argp, sizeof(req)))
		return -EFAULT;

	usr_data = (const void __user *)(uintptr_t)req.usr_data;
	usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
	if (!access_ok(VERIFY_READ, usr_data, req.len) ||
	    !access_ok(VERIFY_READ, usr_oob, req.ooblen))
		return -EFAULT;

	if (!mtd->_write_oob)
		return -EOPNOTSUPP;

	ops.mode = req.mode;
	ops.len = (size_t)req.len;
	ops.ooblen = (size_t)req.ooblen;
	ops.ooboffs = 0;

	if (usr_data) {
		ops.datbuf = memdup_user(usr_data, ops.len);
		if (IS_ERR(ops.datbuf))
			return PTR_ERR(ops.datbuf);
	} else {
		ops.datbuf = NULL;
	}

	if (usr_oob) {
		ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
		if (IS_ERR(ops.oobbuf)) {
			kfree(ops.datbuf);
			return PTR_ERR(ops.oobbuf);
		}
	} else {
		ops.oobbuf = NULL;
	}

	ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);

	kfree(ops.datbuf);
	kfree(ops.oobbuf);

	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
Brian Norris25586.15%120.00%


Geert Uytterhoeven3812.84%120.00%


Artem B. Bityutskiy31.01%360.00%


Total296100.00%5100.00%






static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
{
	struct mtd_file_info *mfi = file->private_data;
	struct mtd_info *mtd = mfi->mtd;
	void __user *argp = (void __user *)arg;
	int ret = 0;
	u_long size;
	struct mtd_info_user info;

	pr_debug("MTD_ioctl\n");

	size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
	if (cmd & IOC_IN) {
		if (!access_ok(VERIFY_READ, argp, size))
			return -EFAULT;
	}
	if (cmd & IOC_OUT) {
		if (!access_ok(VERIFY_WRITE, argp, size))
			return -EFAULT;
	}

	switch (cmd) {
	case MEMGETREGIONCOUNT:
		if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
			return -EFAULT;
		break;

	case MEMGETREGIONINFO:
	{
		uint32_t ur_idx;
		struct mtd_erase_region_info *kr;
		struct region_info_user __user *ur = argp;

		if (get_user(ur_idx, &(ur->regionindex)))
			return -EFAULT;

		if (ur_idx >= mtd->numeraseregions)
			return -EINVAL;

		kr = &(mtd->eraseregions[ur_idx]);

		if (put_user(kr->offset, &(ur->offset))
		    || put_user(kr->erasesize, &(ur->erasesize))
		    || put_user(kr->numblocks, &(ur->numblocks)))
			return -EFAULT;

		break;
	}

	case MEMGETINFO:
		memset(&info, 0, sizeof(info));
		info.type	= mtd->type;
		info.flags	= mtd->flags;
		info.size	= mtd->size;
		info.erasesize	= mtd->erasesize;
		info.writesize	= mtd->writesize;
		info.oobsize	= mtd->oobsize;
		/* The below field is obsolete */
		info.padding	= 0;
		if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
			return -EFAULT;
		break;

	case MEMERASE:
	case MEMERASE64:
	{
		struct erase_info *erase;

		if(!(file->f_mode & FMODE_WRITE))
			return -EPERM;

		erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
		if (!erase)
			ret = -ENOMEM;
		else {
			wait_queue_head_t waitq;
			DECLARE_WAITQUEUE(wait, current);

			init_waitqueue_head(&waitq);

			if (cmd == MEMERASE64) {
				struct erase_info_user64 einfo64;

				if (copy_from_user(&einfo64, argp,
					    sizeof(struct erase_info_user64))) {
					kfree(erase);
					return -EFAULT;
				}
				erase->addr = einfo64.start;
				erase->len = einfo64.length;
			} else {
				struct erase_info_user einfo32;

				if (copy_from_user(&einfo32, argp,
					    sizeof(struct erase_info_user))) {
					kfree(erase);
					return -EFAULT;
				}
				erase->addr = einfo32.start;
				erase->len = einfo32.length;
			}
			erase->mtd = mtd;
			erase->callback = mtdchar_erase_callback;
			erase->priv = (unsigned long)&waitq;

			/*
                          FIXME: Allow INTERRUPTIBLE. Which means
                          not having the wait_queue head on the stack.

                          If the wq_head is on the stack, and we
                          leave because we got interrupted, then the
                          wq_head is no longer there when the
                          callback routine tries to wake us up.
                        */
			ret = mtd_erase(mtd, erase);
			if (!ret) {
				set_current_state(TASK_UNINTERRUPTIBLE);
				add_wait_queue(&waitq, &wait);
				if (erase->state != MTD_ERASE_DONE &&
				    erase->state != MTD_ERASE_FAILED)
					schedule();
				remove_wait_queue(&waitq, &wait);
				set_current_state(TASK_RUNNING);

				ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
			}
			kfree(erase);
		}
		break;
	}

	case MEMWRITEOOB:
	{
		struct mtd_oob_buf buf;
		struct mtd_oob_buf __user *buf_user = argp;

		/* NOTE: writes return length to buf_user->length */
		if (copy_from_user(&buf, argp, sizeof(buf)))
			ret = -EFAULT;
		else
			ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
				buf.ptr, &buf_user->length);
		break;
	}

	case MEMREADOOB:
	{
		struct mtd_oob_buf buf;
		struct mtd_oob_buf __user *buf_user = argp;

		/* NOTE: writes return length to buf_user->start */
		if (copy_from_user(&buf, argp, sizeof(buf)))
			ret = -EFAULT;
		else
			ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
				buf.ptr, &buf_user->start);
		break;
	}

	case MEMWRITEOOB64:
	{
		struct mtd_oob_buf64 buf;
		struct mtd_oob_buf64 __user *buf_user = argp;

		if (copy_from_user(&buf, argp, sizeof(buf)))
			ret = -EFAULT;
		else
			ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
				(void __user *)(uintptr_t)buf.usr_ptr,
				&buf_user->length);
		break;
	}

	case MEMREADOOB64:
	{
		struct mtd_oob_buf64 buf;
		struct mtd_oob_buf64 __user *buf_user = argp;

		if (copy_from_user(&buf, argp, sizeof(buf)))
			ret = -EFAULT;
		else
			ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
				(void __user *)(uintptr_t)buf.usr_ptr,
				&buf_user->length);
		break;
	}

	case MEMWRITE:
	{
		ret = mtdchar_write_ioctl(mtd,
		      (struct mtd_write_req __user *)arg);
		break;
	}

	case MEMLOCK:
	{
		struct erase_info_user einfo;

		if (copy_from_user(&einfo, argp, sizeof(einfo)))
			return -EFAULT;

		ret = mtd_lock(mtd, einfo.start, einfo.length);
		break;
	}

	case MEMUNLOCK:
	{
		struct erase_info_user einfo;

		if (copy_from_user(&einfo, argp, sizeof(einfo)))
			return -EFAULT;

		ret = mtd_unlock(mtd, einfo.start, einfo.length);
		break;
	}

	case MEMISLOCKED:
	{
		struct erase_info_user einfo;

		if (copy_from_user(&einfo, argp, sizeof(einfo)))
			return -EFAULT;

		ret = mtd_is_locked(mtd, einfo.start, einfo.length);
		break;
	}

	/* Legacy interface */
	case MEMGETOOBSEL:
	{
		struct nand_oobinfo oi;

		if (!mtd->ooblayout)
			return -EOPNOTSUPP;

		ret = get_oobinfo(mtd, &oi);
		if (ret)
			return ret;

		if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
			return -EFAULT;
		break;
	}

	case MEMGETBADBLOCK:
	{
		loff_t offs;

		if (copy_from_user(&offs, argp, sizeof(loff_t)))
			return -EFAULT;
		return mtd_block_isbad(mtd, offs);
		break;
	}

	case MEMSETBADBLOCK:
	{
		loff_t offs;

		if (copy_from_user(&offs, argp, sizeof(loff_t)))
			return -EFAULT;
		return mtd_block_markbad(mtd, offs);
		break;
	}

	case OTPSELECT:
	{
		int mode;
		if (copy_from_user(&mode, argp, sizeof(int)))
			return -EFAULT;

		mfi->mode = MTD_FILE_MODE_NORMAL;

		ret = otp_select_filemode(mfi, mode);

		file->f_pos = 0;
		break;
	}

	case OTPGETREGIONCOUNT:
	case OTPGETREGIONINFO:
	{
		struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
		size_t retlen;
		if (!buf)
			return -ENOMEM;
		switch (mfi->mode) {
		case MTD_FILE_MODE_OTP_FACTORY:
			ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf);
			break;
		case MTD_FILE_MODE_OTP_USER:
			ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf);
			break;
		default:
			ret = -EINVAL;
			break;
		}
		if (!ret) {
			if (cmd == OTPGETREGIONCOUNT) {
				int nbr = retlen / sizeof(struct otp_info);
				ret = copy_to_user(argp, &nbr, sizeof(int));
			} else
				ret = copy_to_user(argp, buf, retlen);
			if (ret)
				ret = -EFAULT;
		}
		kfree(buf);
		break;
	}

	case OTPLOCK:
	{
		struct otp_info oinfo;

		if (mfi->mode != MTD_FILE_MODE_OTP_USER)
			return -EINVAL;
		if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
			return -EFAULT;
		ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
		break;
	}

	/* This ioctl is being deprecated - it truncates the ECC layout */
	case ECCGETLAYOUT:
	{
		struct nand_ecclayout_user *usrlay;

		if (!mtd->ooblayout)
			return -EOPNOTSUPP;

		usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
		if (!usrlay)
			return -ENOMEM;

		shrink_ecclayout(mtd, usrlay);

		if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
			ret = -EFAULT;
		kfree(usrlay);
		break;
	}

	case ECCGETSTATS:
	{
		if (copy_to_user(argp, &mtd->ecc_stats,
				 sizeof(struct mtd_ecc_stats)))
			return -EFAULT;
		break;
	}

	case MTDFILEMODE:
	{
		mfi->mode = 0;

		switch(arg) {
		case MTD_FILE_MODE_OTP_FACTORY:
		case MTD_FILE_MODE_OTP_USER:
			ret = otp_select_filemode(mfi, arg);
			break;

		case MTD_FILE_MODE_RAW:
			if (!mtd_has_oob(mtd))
				return -EOPNOTSUPP;
			mfi->mode = arg;

		case MTD_FILE_MODE_NORMAL:
			break;
		default:
			ret = -EINVAL;
		}
		file->f_pos = 0;
		break;
	}

	case BLKPG:
	{
		struct blkpg_ioctl_arg __user *blk_arg = argp;
		struct blkpg_ioctl_arg a;

		if (copy_from_user(&a, blk_arg, sizeof(a)))
			ret = -EFAULT;
		else
			ret = mtdchar_blkpg_ioctl(mtd, &a);
		break;
	}

	case BLKRRPART:
	{
		/* No reread partition feature. Just return ok */
		ret = 0;
		break;
	}

	default:
		ret = -ENOTTY;
	}

	return ret;
} 
Contributors
PersonTokensPropCommitsCommitProp
Kevin Cernekee64537.87%36.12%


Linus Torvalds (pre-git)22313.09%24.08%


Nico Pitre21012.33%36.12%


Thomas Gleixner19611.51%48.16%


David Woodhouse1257.34%24.08%


Brian Norris1196.99%816.33%


Richard Cochran432.52%12.04%


Roman Tereshonkov241.41%12.04%


Artem B. Bityutskiy241.41%1224.49%


Harvey Harrison201.17%24.08%


Christian Riesch160.94%12.04%


Vasiliy Kulikov130.76%12.04%


Dan Carpenter120.70%12.04%


Linus Torvalds110.65%36.12%


Boris Brezillon110.65%24.08%


David Scidmore60.35%12.04%


Al Viro40.23%12.04%


H Hartley Sweeten10.06%12.04%


Total1703100.00%49100.00%



/* memory_ioctl */




static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
{
	int ret;

	mutex_lock(&mtd_mutex);
	ret = mtdchar_ioctl(file, cmd, arg);
	mutex_unlock(&mtd_mutex);

	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
Arnd Bergmann4495.65%266.67%


Artem B. Bityutskiy24.35%133.33%


Total46100.00%3100.00%



#ifdef CONFIG_COMPAT


struct mtd_oob_buf32 {
	
u_int32_t start;
	
u_int32_t length;
	
compat_caddr_t ptr;	/* unsigned char* */
};


#define MEMWRITEOOB32		_IOWR('M', 3, struct mtd_oob_buf32)

#define MEMREADOOB32		_IOWR('M', 4, struct mtd_oob_buf32)




static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
	unsigned long arg)
{
	struct mtd_file_info *mfi = file->private_data;
	struct mtd_info *mtd = mfi->mtd;
	void __user *argp = compat_ptr(arg);
	int ret = 0;

	mutex_lock(&mtd_mutex);

	switch (cmd) {
	case MEMWRITEOOB32:
	{
		struct mtd_oob_buf32 buf;
		struct mtd_oob_buf32 __user *buf_user = argp;

		if (copy_from_user(&buf, argp, sizeof(buf)))
			ret = -EFAULT;
		else
			ret = mtdchar_writeoob(file, mtd, buf.start,
				buf.length, compat_ptr(buf.ptr),
				&buf_user->length);
		break;
	}

	case MEMREADOOB32:
	{
		struct mtd_oob_buf32 buf;
		struct mtd_oob_buf32 __user *buf_user = argp;

		/* NOTE: writes return length to buf->start */
		if (copy_from_user(&buf, argp, sizeof(buf)))
			ret = -EFAULT;
		else
			ret = mtdchar_readoob(file, mtd, buf.start,
				buf.length, compat_ptr(buf.ptr),
				&buf_user->start);
		break;
	}

	case BLKPG:
	{
		/* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */
		struct blkpg_compat_ioctl_arg __user *uarg = argp;
		struct blkpg_compat_ioctl_arg compat_arg;
		struct blkpg_ioctl_arg a;

		if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) {
			ret = -EFAULT;
			break;
		}

		memset(&a, 0, sizeof(a));
		a.op = compat_arg.op;
		a.flags = compat_arg.flags;
		a.datalen = compat_arg.datalen;
		a.data = compat_ptr(compat_arg.data);

		ret = mtdchar_blkpg_ioctl(mtd, &a);
		break;
	}

	default:
		ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
	}

	mutex_unlock(&mtd_mutex);

	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
Kevin Cernekee20261.21%228.57%


Brian Norris10632.12%228.57%


Arnd Bergmann103.03%114.29%


David Woodhouse82.42%114.29%


Artem B. Bityutskiy41.21%114.29%


Total330100.00%7100.00%



#endif /* CONFIG_COMPAT */

/*
 * try to determine where a shared mapping can be made
 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
 *   mappings)
 */
#ifndef CONFIG_MMU



static unsigned long mtdchar_get_unmapped_area(struct file *file,
					   unsigned long addr,
					   unsigned long len,
					   unsigned long pgoff,
					   unsigned long flags)
{
	struct mtd_file_info *mfi = file->private_data;
	struct mtd_info *mtd = mfi->mtd;
	unsigned long offset;
	int ret;

	if (addr != 0)
		return (unsigned long) -EINVAL;

	if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
		return (unsigned long) -EINVAL;

	offset = pgoff << PAGE_SHIFT;
	if (offset > mtd->size - len)
		return (unsigned long) -EINVAL;

	ret = mtd_get_unmapped_area(mtd, len, offset, flags);
	return ret == -EOPNOTSUPP ? -ENODEV : ret;
}


Contributors
PersonTokensPropCommitsCommitProp
David Howells12588.65%120.00%


Artem B. Bityutskiy1510.64%360.00%


Vladimir Zapolskiy10.71%120.00%


Total141100.00%5100.00%






static unsigned mtdchar_mmap_capabilities(struct file *file)
{
	struct mtd_file_info *mfi = file->private_data;

	return mtd_mmap_capabilities(mfi->mtd);
}

Contributors
PersonTokensPropCommitsCommitProp
Christoph Hellwig28100.00%1100.00%


Total28100.00%1100.00%



#endif

/*
 * set up a mapping for shared memory segments
 */



static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
{
#ifdef CONFIG_MMU
	struct mtd_file_info *mfi = file->private_data;
	struct mtd_info *mtd = mfi->mtd;
	struct map_info *map = mtd->priv;

        /* This is broken because it assumes the MTD device is map-based
           and that mtd->priv is a valid struct map_info.  It should be
           replaced with something that uses the mtd_get_unmapped_area()
           operation properly. */
	if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
#ifdef pgprot_noncached
		if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
			vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
#endif
		return vm_iomap_memory(vma, map->phys, map->size);
	}
	return -ENODEV;
#else
	return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
#endif
}


Contributors
PersonTokensPropCommitsCommitProp
David Howells5847.93%116.67%


Anatolij Gustschin4839.67%116.67%


Linus Torvalds97.44%116.67%


David Woodhouse32.48%116.67%


Vladimir Zapolskiy21.65%116.67%


Artem B. Bityutskiy10.83%116.67%


Total121100.00%6100.00%




static const struct file_operations mtd_fops = {
	.owner		= THIS_MODULE,
	.llseek		= mtdchar_lseek,
	.read		= mtdchar_read,
	.write		= mtdchar_write,
	.unlocked_ioctl	= mtdchar_unlocked_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= mtdchar_compat_ioctl,
#endif
	.open		= mtdchar_open,
	.release	= mtdchar_close,
	.mmap		= mtdchar_mmap,
#ifndef CONFIG_MMU
	.get_unmapped_area = mtdchar_get_unmapped_area,
	.mmap_capabilities = mtdchar_mmap_capabilities,
#endif
};




int __init init_mtdchar(void)
{
	int ret;

	ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
				   "mtd", &mtd_fops);
	if (ret < 0) {
		pr_err("Can't allocate major number %d for MTD\n",
		       MTD_CHAR_MAJOR);
		return ret;
	}

	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1530.00%225.00%


Kirill A. Shutemov918.00%112.50%


Todd Android Poynor918.00%112.50%


Ben Hutchings714.00%112.50%


David Brownell612.00%112.50%


Linus Torvalds24.00%112.50%


Artem B. Bityutskiy24.00%112.50%


Total50100.00%8100.00%






void __exit cleanup_mtdchar(void)
{
	__unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1257.14%133.33%


Ben Hutchings733.33%133.33%


Linus Torvalds29.52%133.33%


Total21100.00%3100.00%




MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);

Overall Contributors
PersonTokensPropCommitsCommitProp
Kevin Cernekee124123.57%43.20%


Linus Torvalds (pre-git)74014.05%32.40%


Brian Norris69913.27%1512.00%


Thomas Gleixner4668.85%75.60%


Boris Brezillon3797.20%32.40%


Nico Pitre2985.66%32.40%


David Howells2073.93%10.80%


Linus Torvalds1773.36%54.00%


Roman Tereshonkov1482.81%21.60%


David Woodhouse1442.73%64.80%


Artem B. Bityutskiy1322.51%2923.20%


Arnd Bergmann721.37%21.60%


Anatolij Gustschin490.93%10.80%


Uwe Kleine-König440.84%10.80%


Al Viro440.84%64.80%


Richard Cochran430.82%10.80%


Geert Uytterhoeven380.72%10.80%


Jonathan Corbet350.66%10.80%


Christoph Hellwig340.65%10.80%


Grant Erickson330.63%10.80%


Christian Riesch310.59%21.60%


Thiago Galesi220.42%10.80%


Jörn Engel220.42%10.80%


Harvey Harrison200.38%21.60%


Art Haas140.27%10.80%


Ben Hutchings140.27%10.80%


Kirill A. Shutemov140.27%10.80%


Vasiliy Kulikov130.25%10.80%


Dan Carpenter120.23%10.80%


Todd Android Poynor100.19%21.60%


Joakim Tjernlund70.13%10.80%


Zev Weiss70.13%10.80%


Jesper Juhl70.13%10.80%


David Scidmore60.11%10.80%


Peter Wippich60.11%10.80%


Julia Lawall60.11%10.80%


David Brownell60.11%10.80%


Scott James Remnant50.09%10.80%


Vladimir Zapolskiy30.06%10.80%


Muthu Kumar30.06%10.80%


Andrew Morton30.06%10.80%


Ezequiel García30.06%10.80%


Robert Love20.04%10.80%


Tim Schmielau20.04%10.80%


Nobuhiro Iwamatsu10.02%10.80%


H Hartley Sweeten10.02%10.80%


Arjan van de Ven10.02%10.80%


Will Newton10.02%10.80%


Roel Kluin10.02%10.80%


Total5266100.00%125100.00%


Directory: drivers/mtd



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