path: root/security/inode.c

/*
 *  inode.c - securityfs
 *
 *  Copyright (C) 2005 Greg Kroah-Hartman <gregkh@suse.de>
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License version
 *	2 as published by the Free Software Foundation.
 *
 *  Based on fs/debugfs/inode.c which had the following copyright notice:
 *    Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
 *    Copyright (C) 2004 IBM Inc.
 */

/* #define DEBUG */
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/pagemap.h>
#include <linux/init.h>
#include <linux/namei.h>
#include <linux/security.h>

#define SECURITYFS_MAGIC	0x73636673

static struct vfsmount *mount;
static int mount_count;

/*
 * TODO:
 *   I think I can get rid of these default_file_ops, but not quite sure...
 */
static ssize_t default_read_file(struct file *file, char __user *buf,
				 size_t count, loff_t *ppos)
{
	return 0;
}

static ssize_t default_write_file(struct file *file, const char __user *buf,
				   size_t count, loff_t *ppos)
{
	return count;
}

static int default_open(struct inode *inode, struct file *file)
{
	if (inode->u.generic_ip)
		file->private_data = inode->u.generic_ip;

	return 0;
}

static struct file_operations default_file_ops = {
	.read =		default_read_file,
	.write =	default_write_file,
	.open =		default_open,
};

static struct inode *get_inode(struct super_block *sb, int mode, dev_t dev)
{
	struct inode *inode = new_inode(sb);

	if (inode) {
		inode->i_mode = mode;
		inode->i_uid = 0;
		inode->i_gid = 0;
		inode->i_blksize = PAGE_CACHE_SIZE;
		inode->i_blocks = 0;
		inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
		switch (mode & S_IFMT) {
		default:
			init_special_inode(inode, mode, dev);
			break;
		case S_IFREG:
			inode->i_fop = &default_file_ops;
			break;
		case S_IFDIR:
			inode->i_op = &simple_dir_inode_operations;
			inode->i_fop = &simple_dir_operations;

			/* directory inodes start off with i_nlink == 2 (for "." entry) */
			inode->i_nlink++;
			break;
		}
	}
	return inode;
}

/* SMP-safe */
static int mknod(struct inode *dir, struct dentry *dentry,
			 int mode, <
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2016 CNEX Labs
 * Initial: Javier Gonzalez <javier@cnexlabs.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * 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.
 *
 * pblk-recovery.c - pblk's recovery path
 *
 * The L2P recovery path is single threaded as the L2P table is updated in order
 * following the line sequence ID.
 */

#include "pblk.h"
#include "pblk-trace.h"

int pblk_recov_check_emeta(struct pblk *pblk, struct line_emeta *emeta_buf)
{
	u32 crc;

	crc = pblk_calc_emeta_crc(pblk, emeta_buf);
	if (le32_to_cpu(emeta_buf->crc) != crc)
		return 1;

	if (le32_to_cpu(emeta_buf->header.identifier) != PBLK_MAGIC)
		return 1;

	return 0;
}

static int pblk_recov_l2p_from_emeta(struct pblk *pblk, struct pblk_line *line)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct pblk_line_meta *lm = &pblk->lm;
	struct pblk_emeta *emeta = line->emeta;
	struct line_emeta *emeta_buf = emeta->buf;
	__le64 *lba_list;
	u64 data_start, data_end;
	u64 nr_valid_lbas, nr_lbas = 0;
	u64 i;

	lba_list = emeta_to_lbas(pblk, emeta_buf);
	if (!lba_list)
		return 1;

	data_start = pblk_line_smeta_start(pblk, line) + lm->smeta_sec;
	data_end = line->emeta_ssec;
	nr_valid_lbas = le64_to_cpu(emeta_buf->nr_valid_lbas);

	for (i = data_start; i < data_end; i++) {
		struct ppa_addr ppa;
		int pos;

		ppa = addr_to_gen_ppa(pblk, i, line->id);
		pos = pblk_ppa_to_pos(geo, ppa);

		/* Do not update bad blocks */
		if (test_bit(pos, line->blk_bitmap))
			continue;

		if (le64_to_cpu(lba_list[i]) == ADDR_EMPTY) {
			spin_lock(&line->lock);
			if (test_and_set_bit(i, line->invalid_bitmap))
				WARN_ONCE(1, "pblk: rec. double invalidate:\n");
			else
				le32_add_cpu(line->vsc, -1);
			spin_unlock(&line->lock);

			continue;
		}

		pblk_update_map(pblk, le64_to_cpu(lba_list[i]), ppa);
		nr_lbas++;
	}

	if (nr_valid_lbas != nr_lbas)
		pblk_err(pblk, "line %d - inconsistent lba list(%llu/%llu)\n",
				line->id, nr_valid_lbas, nr_lbas);

	line->left_msecs = 0;

	return 0;
}

static void pblk_update_line_wp(struct pblk *pblk, struct pblk_line *line,
				u64 written_secs)
{
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	int i;

	for (i = 0; i < written_secs; i += pblk->min_write_pgs)
		__pblk_alloc_page(pblk, line, pblk->min_write_pgs);

	spin_lock(&l_mg->free_lock);
	if (written_secs > line->left_msecs) {
		/*
		 * We have all data sectors written
		 * and some emeta sectors written too.
		 */
		line->left_msecs = 0;
	} else {
		/* We have only some data sectors written. */
		line->left_msecs -= written_secs;
	}
	spin_unlock(&l_mg->free_lock);
}

static u64 pblk_sec_in_open_line(struct pblk *pblk, struct pblk_line *line)
{
	struct pblk_line_meta *lm = &pblk->lm;
	int nr_bb = bitmap_weight(line->blk_bitmap, lm->blk_per_line);
	u64 written_secs = 0;
	int valid_chunks = 0;
	int i;

	for (i = 0; i < lm->blk_per_line; i++) {
		struct nvm_chk_meta *chunk = &line->chks[i];

		if (chunk->state & NVM_CHK_ST_OFFLINE)
			continue;

		written_secs += chunk->wp;
		valid_chunks++;
	}

	if (lm->blk_per_line - nr_bb != valid_chunks)
		pblk_err(pblk, "recovery line %d is bad\n", line->id);

	pblk_update_line_wp(pblk, line, written_secs - lm->smeta_sec);

	return written_secs;
}

struct pblk_recov_alloc {
	struct ppa_addr *ppa_list;
	void *meta_list;
	struct nvm_rq *rqd;
	void *data;
	dma_addr_t dma_ppa_list;
	dma_addr_t dma_meta_list;
};

static void pblk_recov_complete(struct kref *ref)
{
	struct pblk_pad_rq *pad_rq = container_of(ref, struct pblk_pad_rq, ref);

	complete(&pad_rq->wait);
}

static void pblk_end_io_recov(struct nvm_rq *rqd)
{
	struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
	struct