[mirror_ubuntu-artful-kernel.git] / fs / pstore / inode.c

/*
 * Persistent Storage - ramfs parts.
 *
 * Copyright (C) 2010 Intel Corporation <tony.luck@intel.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.
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/module.h>
#include <linux/fs.h>
#include <linux/fsnotify.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#include <linux/time.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/string.h>
#include <linux/mount.h>
#include <linux/seq_file.h>
#include <linux/ramfs.h>
#include <linux/parser.h>
#include <linux/sched.h>
#include <linux/magic.h>
#include <linux/pstore.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>

#include "internal.h"

#define	PSTORE_NAMELEN	64

static DEFINE_SPINLOCK(allpstore_lock);
static LIST_HEAD(allpstore);

struct pstore_private {
	struct list_head list;
	struct pstore_info *psi;
	enum pstore_type_id type;
	u64	id;
	int	count;
	ssize_t	size;
	char	data[];
};

struct pstore_ftrace_seq_data {
	const void *ptr;
	size_t off;
	size_t size;
};

#define REC_SIZE sizeof(struct pstore_ftrace_record)

static void *pstore_ftrace_seq_start(struct seq_file *s, loff_t *pos)
{
	struct pstore_private *ps = s->private;
	struct pstore_ftrace_seq_data *data;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return NULL;

	data->off = ps->size % REC_SIZE;
	data->off += *pos * REC_SIZE;
	if (data->off + REC_SIZE > ps->size) {
		kfree(data);
		return NULL;
	}

	return data;

}

static void pstore_ftrace_seq_stop(struct seq_file *s, void *v)
{
	kfree(v);
}

static void *pstore_ftrace_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
	struct pstore_private *ps = s->private;
	struct pstore_ftrace_seq_data *data = v;

	data->off += REC_SIZE;
	if (data->off + REC_SIZE > ps->size)
		return NULL;

	(*pos)++;
	return data;
}

static int pstore_ftrace_seq_show(struct seq_file *s, void *v)
{
	struct pstore_private *ps = s->private;
	struct pstore_ftrace_seq_data *data = v;
	struct pstore_ftrace_record *rec = (void *)(ps->data + data->off);

	seq_printf(s, "%d %08lx  %08lx  %pf <- %pF\n",
		pstore_ftrace_decode_cpu(rec), rec->ip, rec->parent_ip,
		(void *)rec->ip, (void *)rec->parent_ip);

	return 0;
}

static const struct seq_operations pstore_ftrace_seq_ops = {
	.start	= pstore_ftrace_seq_start,
	.next	= pstore_ftrace_seq_next,
	.stop	= pstore_ftrace_seq_stop,
	.show	= pstore_ftrace_seq_show,
};

static ssize_t pstore_file_read(struct file *file, char __user *userbuf,
						size_t count, loff_t *ppos)
{
	struct seq_file *sf = file->private_data;
	struct pstore_private *ps = sf->private;

	if (ps->type == PSTORE_TYPE_FTRACE)
		return seq_read(file, userbuf, count, ppos);
	return simple_read_from_buffer(userbuf, count, ppos, ps->data, ps->size);
}

static int pstore_file_open(struct inode *inode, struct file *file)
{
	struct pstore_private *ps = inode->i_private;
	struct seq_file *sf;
	int err;
	const struct seq_operations *sops = NULL;

	if (ps->type == PSTORE_TYPE_FTRACE)
		sops = &pstore_ftrace_seq_ops;

	err = seq_open(file, sops);
	if (err < 0)
		return err;

	sf = file->private_data;
	sf->private = ps;

	return 0;
}

static loff_t pstore_file_llseek(struct file *file, loff_t off, int whence)
{
	struct seq_file *sf = file->private_data;

	if (sf->op)
		return seq_lseek(file, off, whence);
	return default_llseek(file, off, whence);
}

static const struct file_operations pstore_file_operations = {
	.open		= pstore_file_open,
	.read		= pstore_file_read,
	.llseek		= pstore_file_llseek,
	.release	= seq_release,
};

/*
 * When a file is unlinked from our file system we call the
 * platform driver to erase the record from persistent store.
 */
static int pstore_unlink(struct inode *dir, struct dentry *dentry)
{
	struct pstore_private *p = dentry->d_inode->i_private;

	if (p->psi->erase)
		p->psi->erase(p->type, p->id, p->count,
			      dentry->d_inode->i_ctime, p->psi);
	else
		return -EPERM;

	return simple_unlink(dir, dentry);
}

static void pstore_evict_inode(struct inode *inode)
{
	struct pstore_private	*p = inode->i_private;
	unsigned long		flags;

	clear_inode(inode);
	if (p) {
		spin_lock_irqsave(&allpstore_lock, flags);
		list_del(&p->list);
		spin_unlock_irqrestore(&allpstore_lock, flags);
		kfree(p);
	}
}

static const struct inode_operations pstore_dir_inode_operations = {
	.lookup		= simple_lookup,
	.unlink		= pstore_unlink,
};

static struct inode *pstore_get_inode(struct super_block *sb)
{
	struct inode *inode = new_inode(sb);
	if (inode) {
		inode->i_ino = get_next_ino();
		inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	}
	return inode;
}

enum {
	Opt_kmsg_bytes, Opt_err
};

static const match_table_t tokens = {
	{Opt_kmsg_bytes, "kmsg_bytes=%u"},
	{Opt_err, NULL}
};

static void parse_options(char *options)
{
	char		*p;
	substring_t	args[MAX_OPT_ARGS];
	int		option;

	if (!options)
		return;

	while ((p = strsep(&options, ",")) != NULL) {
		int token;

		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_kmsg_bytes:
			if (!match_int(&args[0], &option))
				pstore_set_kmsg_bytes(option);
			break;
		}
	}
}

static int pstore_remount(struct super_block *sb, int *flags, char *data)
{
	sync_filesystem(sb);
	parse_options(data);

	return 0;
}

static const struct super_operations pstore_ops = {
	.statfs		= simple_statfs,
	.drop_inode	= generic_delete_inode,
	.evict_inode	= pstore_evict_inode,
	.remount_fs	= pstore_remount,
	.show_options	= generic_show_options,
};

static struct super_block *pstore_sb;

int pstore_is_mounted(void)
{
	return pstore_sb != NULL;
}

/*
 * Make a regular file in the root directory of our file system.
 * Load it up with "size" bytes of data from "buf".
 * Set the mtime & ctime to the date that this record was originally stored.
 */
int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
		  char *data, bool compressed, size_t size,
		  struct timespec time, struct pstore_info *psi)
{
	struct dentry		*root = pstore_sb->s_root;
	struct dentry		*dentry;
	struct inode		*inode;
	int			rc = 0;
	char			name[PSTORE_NAMELEN];
	struct pstore_private	*private, *pos;
	unsigned long		flags;

	spin_lock_irqsave(&allpstore_lock, flags);
	list_for_each_entry(pos, &allpstore, list) {
		if (pos->type == type &&
		    pos->id == id &&
		    pos->psi == psi) {
			rc = -EEXIST;
			break;
		}
	}
	spin_unlock_irqrestore(&allpstore_lock, flags);
	if (rc)
		return rc;

	rc = -ENOMEM;
	inode = pstore_get_inode(pstore_sb);
	if (!inode)
		goto fail;
	inode->i_mode = S_IFREG | 0444;
	inode->i_fop = &pstore_file_operations;
	private = kmalloc(sizeof *private + size, GFP_KERNEL);
	if (!private)
		goto fail_alloc;
	private->type = type;
	private->id = id;
	private->count = count;
	private->psi = psi;

	switch (type) {
	case PSTORE_TYPE_DMESG:
		sprintf(name, "dmesg-%s-%lld%s", psname, id,
						compressed ? ".enc.z" : "");
		break;
	case PSTORE_TYPE_CONSOLE:
		sprintf(name, "console-%s", psname);
		break;
	case PSTORE_TYPE_FTRACE:
		sprintf(name, "ftrace-%s", psname);
		break;
	case PSTORE_TYPE_MCE:
		sprintf(name, "mce-%s-%lld", psname, id);
		break;
	case PSTORE_TYPE_PPC_RTAS:
		sprintf(name, "rtas-%s-%lld", psname, id);
		break;
	case PSTORE_TYPE_PPC_OF:
		sprintf(name, "powerpc-ofw-%s-%lld", psname, id);
		break;
	case PSTORE_TYPE_PPC_COMMON:
		sprintf(name, "powerpc-common-%s-%lld", psname, id);
		break;
	case PSTORE_TYPE_UNKNOWN:
		sprintf(name, "unknown-%s-%lld", psname, id);
		break;
	default:
		sprintf(name, "type%d-%s-%lld", type, psname, id);
		break;
	}

	mutex_lock(&root->d_inode->i_mutex);

	dentry = d_alloc_name(root, name);
	if (!dentry)
		goto fail_lockedalloc;

	memcpy(private->data, data, size);
	inode->i_size = private->size = size;

	inode->i_private = private;

	if (time.tv_sec)
		inode->i_mtime = inode->i_ctime = time;

	d_add(dentry, inode);

	spin_lock_irqsave(&allpstore_lock, flags);
	list_add(&private->list, &allpstore);
	spin_unlock_irqrestore(&allpstore_lock, flags);

	mutex_unlock(&root->d_inode->i_mutex);

	return 0;

fail_lockedalloc:
	mutex_unlock(&root->d_inode->i_mutex);
	kfree(private);
fail_alloc:
	iput(inode);

fail:
	return rc;
}

static int pstore_fill_super(struct super_block *sb, void *data, int silent)
{
	struct inode *inode;

	save_mount_options(sb, data);

	pstore_sb = sb;

	sb->s_maxbytes		= MAX_LFS_FILESIZE;
	sb->s_blocksize		= PAGE_CACHE_SIZE;
	sb->s_blocksize_bits	= PAGE_CACHE_SHIFT;
	sb->s_magic		= PSTOREFS_MAGIC;
	sb->s_op		= &pstore_ops;
	sb->s_time_gran		= 1;

	parse_options(data);

	inode = pstore_get_inode(sb);
	if (inode) {
		inode->i_mode = S_IFDIR | 0755;
		inode->i_op = &pstore_dir_inode_operations;
		inode->i_fop = &simple_dir_operations;
		inc_nlink(inode);
	}
	sb->s_root = d_make_root(inode);
	if (!sb->s_root)
		return -ENOMEM;

	pstore_get_records(0);

	return 0;
}

static struct dentry *pstore_mount(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data)
{
	return mount_single(fs_type, flags, data, pstore_fill_super);
}

static void pstore_kill_sb(struct super_block *sb)
{
	kill_litter_super(sb);
	pstore_sb = NULL;
}

static struct file_system_type pstore_fs_type = {
	.name		= "pstore",
	.mount		= pstore_mount,
	.kill_sb	= pstore_kill_sb,
};

static struct kobject *pstore_kobj;

static int __init init_pstore_fs(void)
{
	int err = 0;

	/* Create a convenient mount point for people to access pstore */
	pstore_kobj = kobject_create_and_add("pstore", fs_kobj);
	if (!pstore_kobj) {
		err = -ENOMEM;
		goto out;
	}

	err = register_filesystem(&pstore_fs_type);
	if (err < 0)
		kobject_put(pstore_kobj);

out:
	return err;
}
module_init(init_pstore_fs)

MODULE_AUTHOR("Tony Luck <tony.luck@intel.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
ca01d6dd TL	1	/*
	2	* Persistent Storage - ramfs parts.
	3	*
	4	* Copyright (C) 2010 Intel Corporation <tony.luck@intel.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	18	*/
	19
	20	#include <linux/module.h>
	21	#include <linux/fs.h>
	22	#include <linux/fsnotify.h>
	23	#include <linux/pagemap.h>
	24	#include <linux/highmem.h>
	25	#include <linux/time.h>
	26	#include <linux/init.h>
6dda9266	27	#include <linux/list.h>
ca01d6dd TL	28	#include <linux/string.h>
ca01d6dd TL	29	#include <linux/mount.h>
060287b8	30	#include <linux/seq_file.h>
ca01d6dd	31	#include <linux/ramfs.h>
366f7e7a	32	#include <linux/parser.h>
ca01d6dd TL	33	#include <linux/sched.h>
	34	#include <linux/magic.h>
	35	#include <linux/pstore.h>
	36	#include <linux/slab.h>
6dda9266	37	#include <linux/spinlock.h>
ca01d6dd TL	38	#include <linux/uaccess.h>
	39
	40	#include "internal.h"
	41
	42	#define PSTORE_NAMELEN 64
	43
6dda9266 TL	44	static DEFINE_SPINLOCK(allpstore_lock);
	45	static LIST_HEAD(allpstore);
	46
ca01d6dd	47	struct pstore_private {
6dda9266	48	struct list_head list;
638c1fd3	49	struct pstore_info *psi;
56280682 MG	50	enum pstore_type_id type;
56280682 MG	51	u64 id;
755d4fe4	52	int count;
fbe0aa1f TL	53	ssize_t size;
fbe0aa1f TL	54	char data[];
ca01d6dd TL	55	};
ca01d6dd TL	56
060287b8 AV	57	struct pstore_ftrace_seq_data {
	58	const void *ptr;
	59	size_t off;
	60	size_t size;
	61	};
	62
	63	#define REC_SIZE sizeof(struct pstore_ftrace_record)
	64
	65	static void pstore_ftrace_seq_start(struct seq_file s, loff_t *pos)
	66	{
	67	struct pstore_private *ps = s->private;
	68	struct pstore_ftrace_seq_data *data;
	69
	70	data = kzalloc(sizeof(*data), GFP_KERNEL);
	71	if (!data)
	72	return NULL;
	73
	74	data->off = ps->size % REC_SIZE;
	75	data->off += pos REC_SIZE;
	76	if (data->off + REC_SIZE > ps->size) {
	77	kfree(data);
	78	return NULL;
	79	}
	80
	81	return data;
	82
	83	}
	84
	85	static void pstore_ftrace_seq_stop(struct seq_file s, void v)
	86	{
	87	kfree(v);
	88	}
	89
	90	static void pstore_ftrace_seq_next(struct seq_file s, void v, loff_t pos)
	91	{
	92	struct pstore_private *ps = s->private;
	93	struct pstore_ftrace_seq_data *data = v;
	94
	95	data->off += REC_SIZE;
	96	if (data->off + REC_SIZE > ps->size)
	97	return NULL;
	98
	99	(*pos)++;
	100	return data;
	101	}
	102
	103	static int pstore_ftrace_seq_show(struct seq_file s, void v)
	104	{
	105	struct pstore_private *ps = s->private;
	106	struct pstore_ftrace_seq_data *data = v;
	107	struct pstore_ftrace_record rec = (void )(ps->data + data->off);
	108
	109	seq_printf(s, "%d %08lx %08lx %pf <- %pF\n",
	110	pstore_ftrace_decode_cpu(rec), rec->ip, rec->parent_ip,
	111	(void )rec->ip, (void )rec->parent_ip);
	112
	113	return 0;
	114	}
	115
	116	static const struct seq_operations pstore_ftrace_seq_ops = {
	117	.start = pstore_ftrace_seq_start,
	118	.next = pstore_ftrace_seq_next,
	119	.stop = pstore_ftrace_seq_stop,
	120	.show = pstore_ftrace_seq_show,
121	};
122
fbe0aa1f TL	123	static ssize_t pstore_file_read(struct file file, char __user userbuf,
	124	size_t count, loff_t *ppos)
	125	{
060287b8 AV	126	struct seq_file *sf = file->private_data;
060287b8 AV	127	struct pstore_private *ps = sf->private;
fbe0aa1f	128
060287b8 AV	129	if (ps->type == PSTORE_TYPE_FTRACE)
060287b8 AV	130	return seq_read(file, userbuf, count, ppos);
fbe0aa1f TL	131	return simple_read_from_buffer(userbuf, count, ppos, ps->data, ps->size);
	132	}
	133
060287b8 AV	134	static int pstore_file_open(struct inode inode, struct file file)
	135	{
	136	struct pstore_private *ps = inode->i_private;
	137	struct seq_file *sf;
	138	int err;
	139	const struct seq_operations *sops = NULL;
	140
	141	if (ps->type == PSTORE_TYPE_FTRACE)
	142	sops = &pstore_ftrace_seq_ops;
	143
	144	err = seq_open(file, sops);
	145	if (err < 0)
	146	return err;
	147
	148	sf = file->private_data;
	149	sf->private = ps;
	150
	151	return 0;
	152	}
	153
965c8e59	154	static loff_t pstore_file_llseek(struct file *file, loff_t off, int whence)
060287b8 AV	155	{
	156	struct seq_file *sf = file->private_data;
	157
	158	if (sf->op)
965c8e59 AM	159	return seq_lseek(file, off, whence);
965c8e59 AM	160	return default_llseek(file, off, whence);
060287b8 AV	161	}
060287b8 AV	162
fbe0aa1f	163	static const struct file_operations pstore_file_operations = {
060287b8 AV	164	.open = pstore_file_open,
	165	.read = pstore_file_read,
	166	.llseek = pstore_file_llseek,
	167	.release = seq_release,
fbe0aa1f	168	};
ca01d6dd TL	169
	170	/*
	171	* When a file is unlinked from our file system we call the
	172	* platform driver to erase the record from persistent store.
	173	*/
	174	static int pstore_unlink(struct inode dir, struct dentry dentry)
	175	{
	176	struct pstore_private *p = dentry->d_inode->i_private;
	177
2174f6df	178	if (p->psi->erase)
755d4fe4 SA	179	p->psi->erase(p->type, p->id, p->count,
755d4fe4 SA	180	dentry->d_inode->i_ctime, p->psi);
bf288333 AB	181	else
bf288333 AB	182	return -EPERM;
ca01d6dd TL	183
	184	return simple_unlink(dir, dentry);
	185	}
	186
a872d510 TL	187	static void pstore_evict_inode(struct inode *inode)
a872d510 TL	188	{
6dda9266 TL	189	struct pstore_private *p = inode->i_private;
	190	unsigned long flags;
	191
dbd5768f	192	clear_inode(inode);
6dda9266 TL	193	if (p) {
	194	spin_lock_irqsave(&allpstore_lock, flags);
	195	list_del(&p->list);
	196	spin_unlock_irqrestore(&allpstore_lock, flags);
	197	kfree(p);
	198	}
a872d510 TL	199	}
a872d510 TL	200
ca01d6dd TL	201	static const struct inode_operations pstore_dir_inode_operations = {
	202	.lookup = simple_lookup,
	203	.unlink = pstore_unlink,
	204	};
	205
22a71c30	206	static struct inode pstore_get_inode(struct super_block sb)
fbe0aa1f TL	207	{
fbe0aa1f TL	208	struct inode *inode = new_inode(sb);
fbe0aa1f TL	209	if (inode) {
fbe0aa1f TL	210	inode->i_ino = get_next_ino();
fbe0aa1f	211	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
fbe0aa1f TL	212	}
	213	return inode;
	214	}
	215
366f7e7a TL	216	enum {
	217	Opt_kmsg_bytes, Opt_err
	218	};
	219
	220	static const match_table_t tokens = {
	221	{Opt_kmsg_bytes, "kmsg_bytes=%u"},
	222	{Opt_err, NULL}
	223	};
	224
	225	static void parse_options(char *options)
	226	{
	227	char *p;
	228	substring_t args[MAX_OPT_ARGS];
	229	int option;
	230
	231	if (!options)
	232	return;
	233
	234	while ((p = strsep(&options, ",")) != NULL) {
	235	int token;
	236
	237	if (!*p)
	238	continue;
	239
	240	token = match_token(p, tokens, args);
	241	switch (token) {
	242	case Opt_kmsg_bytes:
	243	if (!match_int(&args[0], &option))
	244	pstore_set_kmsg_bytes(option);
	245	break;
	246	}
	247	}
	248	}
	249
	250	static int pstore_remount(struct super_block sb, int flags, char *data)
	251	{
02b9984d	252	sync_filesystem(sb);
366f7e7a TL	253	parse_options(data);
	254
	255	return 0;
	256	}
	257
ca01d6dd TL	258	static const struct super_operations pstore_ops = {
	259	.statfs = simple_statfs,
	260	.drop_inode = generic_delete_inode,
a872d510	261	.evict_inode = pstore_evict_inode,
366f7e7a	262	.remount_fs = pstore_remount,
ca01d6dd TL	263	.show_options = generic_show_options,
	264	};
	265
	266	static struct super_block *pstore_sb;
ca01d6dd TL	267
	268	int pstore_is_mounted(void)
	269	{
fbe0aa1f	270	return pstore_sb != NULL;
ca01d6dd TL	271	}
	272
	273	/*
	274	* Make a regular file in the root directory of our file system.
	275	* Load it up with "size" bytes of data from "buf".
	276	* Set the mtime & ctime to the date that this record was originally stored.
	277	*/
755d4fe4	278	int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
9ad2cbe0 AB	279	char *data, bool compressed, size_t size,
9ad2cbe0 AB	280	struct timespec time, struct pstore_info *psi)
ca01d6dd TL	281	{
	282	struct dentry *root = pstore_sb->s_root;
	283	struct dentry *dentry;
	284	struct inode *inode;
6dda9266	285	int rc = 0;
ca01d6dd	286	char name[PSTORE_NAMELEN];
6dda9266 TL	287	struct pstore_private private, pos;
	288	unsigned long flags;
	289
	290	spin_lock_irqsave(&allpstore_lock, flags);
	291	list_for_each_entry(pos, &allpstore, list) {
	292	if (pos->type == type &&
	293	pos->id == id &&
	294	pos->psi == psi) {
	295	rc = -EEXIST;
	296	break;
	297	}
	298	}
	299	spin_unlock_irqrestore(&allpstore_lock, flags);
	300	if (rc)
	301	return rc;
ca01d6dd TL	302
ca01d6dd TL	303	rc = -ENOMEM;
22a71c30	304	inode = pstore_get_inode(pstore_sb);
ca01d6dd TL	305	if (!inode)
ca01d6dd TL	306	goto fail;
22a71c30 AV	307	inode->i_mode = S_IFREG \| 0444;
22a71c30 AV	308	inode->i_fop = &pstore_file_operations;
fbe0aa1f	309	private = kmalloc(sizeof *private + size, GFP_KERNEL);
ca01d6dd TL	310	if (!private)
ca01d6dd TL	311	goto fail_alloc;
56280682	312	private->type = type;
ca01d6dd	313	private->id = id;
755d4fe4	314	private->count = count;
638c1fd3	315	private->psi = psi;
ca01d6dd TL	316
	317	switch (type) {
	318	case PSTORE_TYPE_DMESG:
9ad2cbe0 AB	319	sprintf(name, "dmesg-%s-%lld%s", psname, id,
9ad2cbe0 AB	320	compressed ? ".enc.z" : "");
ca01d6dd	321	break;
f29e5956 AV	322	case PSTORE_TYPE_CONSOLE:
	323	sprintf(name, "console-%s", psname);
	324	break;
060287b8 AV	325	case PSTORE_TYPE_FTRACE:
	326	sprintf(name, "ftrace-%s", psname);
	327	break;
ca01d6dd TL	328	case PSTORE_TYPE_MCE:
	329	sprintf(name, "mce-%s-%lld", psname, id);
	330	break;
69020eea AB	331	case PSTORE_TYPE_PPC_RTAS:
	332	sprintf(name, "rtas-%s-%lld", psname, id);
	333	break;
f33f748c AB	334	case PSTORE_TYPE_PPC_OF:
	335	sprintf(name, "powerpc-ofw-%s-%lld", psname, id);
	336	break;
a5e4797b AB	337	case PSTORE_TYPE_PPC_COMMON:
	338	sprintf(name, "powerpc-common-%s-%lld", psname, id);
	339	break;
ca01d6dd TL	340	case PSTORE_TYPE_UNKNOWN:
	341	sprintf(name, "unknown-%s-%lld", psname, id);
	342	break;
	343	default:
	344	sprintf(name, "type%d-%s-%lld", type, psname, id);
	345	break;
	346	}
	347
	348	mutex_lock(&root->d_inode->i_mutex);
	349
ca01d6dd	350	dentry = d_alloc_name(root, name);
c39524e6	351	if (!dentry)
ca01d6dd TL	352	goto fail_lockedalloc;
ca01d6dd TL	353
fbe0aa1f TL	354	memcpy(private->data, data, size);
fbe0aa1f TL	355	inode->i_size = private->size = size;
ca01d6dd TL	356
	357	inode->i_private = private;
	358
	359	if (time.tv_sec)
	360	inode->i_mtime = inode->i_ctime = time;
	361
fbe0aa1f	362	d_add(dentry, inode);
ca01d6dd	363
6dda9266 TL	364	spin_lock_irqsave(&allpstore_lock, flags);
	365	list_add(&private->list, &allpstore);
	366	spin_unlock_irqrestore(&allpstore_lock, flags);
	367
ca01d6dd	368	mutex_unlock(&root->d_inode->i_mutex);
fbe0aa1f TL	369
fbe0aa1f TL	370	return 0;
ca01d6dd TL	371
	372	fail_lockedalloc:
	373	mutex_unlock(&root->d_inode->i_mutex);
	374	kfree(private);
	375	fail_alloc:
	376	iput(inode);
	377
	378	fail:
	379	return rc;
	380	}
	381
364ed2f4	382	static int pstore_fill_super(struct super_block sb, void data, int silent)
ca01d6dd	383	{
318ceed0	384	struct inode *inode;
ca01d6dd TL	385
	386	save_mount_options(sb, data);
	387
	388	pstore_sb = sb;
	389
	390	sb->s_maxbytes = MAX_LFS_FILESIZE;
	391	sb->s_blocksize = PAGE_CACHE_SIZE;
	392	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	393	sb->s_magic = PSTOREFS_MAGIC;
	394	sb->s_op = &pstore_ops;
	395	sb->s_time_gran = 1;
	396
366f7e7a TL	397	parse_options(data);
366f7e7a TL	398
22a71c30	399	inode = pstore_get_inode(sb);
318ceed0	400	if (inode) {
22a71c30	401	inode->i_mode = S_IFDIR \| 0755;
318ceed0	402	inode->i_op = &pstore_dir_inode_operations;
22a71c30 AV	403	inode->i_fop = &simple_dir_operations;
22a71c30 AV	404	inc_nlink(inode);
ca01d6dd	405	}
318ceed0 AV	406	sb->s_root = d_make_root(inode);
	407	if (!sb->s_root)
	408	return -ENOMEM;
ca01d6dd	409
6dda9266	410	pstore_get_records(0);
ca01d6dd TL	411
ca01d6dd TL	412	return 0;
ca01d6dd TL	413	}
ca01d6dd TL	414
fbe0aa1f TL	415	static struct dentry pstore_mount(struct file_system_type fs_type,
fbe0aa1f TL	416	int flags, const char dev_name, void data)
ca01d6dd	417	{
fbe0aa1f	418	return mount_single(fs_type, flags, data, pstore_fill_super);
ca01d6dd TL	419	}
	420
	421	static void pstore_kill_sb(struct super_block *sb)
	422	{
	423	kill_litter_super(sb);
	424	pstore_sb = NULL;
ca01d6dd TL	425	}
	426
	427	static struct file_system_type pstore_fs_type = {
	428	.name = "pstore",
fbe0aa1f	429	.mount = pstore_mount,
ca01d6dd TL	430	.kill_sb = pstore_kill_sb,
	431	};
	432
fb0af3f2 JB	433	static struct kobject *pstore_kobj;
fb0af3f2 JB	434
ca01d6dd TL	435	static int __init init_pstore_fs(void)
ca01d6dd TL	436	{
fb0af3f2 JB	437	int err = 0;
	438
	439	/* Create a convenient mount point for people to access pstore */
	440	pstore_kobj = kobject_create_and_add("pstore", fs_kobj);
	441	if (!pstore_kobj) {
	442	err = -ENOMEM;
	443	goto out;
	444	}
	445
	446	err = register_filesystem(&pstore_fs_type);
	447	if (err < 0)
	448	kobject_put(pstore_kobj);
	449
	450	out:
	451	return err;
ca01d6dd TL	452	}
	453	module_init(init_pstore_fs)
	454
	455	MODULE_AUTHOR("Tony Luck <tony.luck@intel.com>");
	456	MODULE_LICENSE("GPL");