WebSVN – HelenOS – Blame – /trunk/uspace/srv/fs/tmpfs/tmpfs_dump.c

Rev	Author	Line No.	Line
3103	jermar	1	/*
		2	* Copyright (c) 2008 Jakub Jermar
		3	* Copyright (c) 2008 Martin Decky
		4	* All rights reserved.
		5	*
		6	* Redistribution and use in source and binary forms, with or without
		7	* modification, are permitted provided that the following conditions
		8	* are met:
		9	*
		10	* - Redistributions of source code must retain the above copyright
		11	* notice, this list of conditions and the following disclaimer.
		12	* - Redistributions in binary form must reproduce the above copyright
		13	* notice, this list of conditions and the following disclaimer in the
		14	* documentation and/or other materials provided with the distribution.
		15	* - The name of the author may not be used to endorse or promote products
		16	* derived from this software without specific prior written permission.
		17	*
		18	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
		19	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
		20	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
		21	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
		22	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
		23	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
		27	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		28	*/
		29
		30	/** @addtogroup fs
		31	* @{
		32	*/
		33
		34	/**
		35	* @file tmpfs_dump.c
		36	* @brief Support for loading TMPFS file system dump.
		37	*/
		38
		39	#include "tmpfs.h"
		40	#include "../../vfs/vfs.h"
		41	#include <errno.h>
		42	#include <stdlib.h>
		43	#include <string.h>
		44	#include <sys/types.h>
		45	#include <as.h>
3521	jermar	46	#include <libblock.h>
3103	jermar	47	#include <byteorder.h>
		48
3251	jermar	49	#define TMPFS_BLOCK_SIZE 1024
3103	jermar	50
		51	struct rdentry {
		52	uint8_t type;
		53	uint32_t len;
		54	} __attribute__((packed));
		55
		56	static bool
3530	jermar	57	tmpfs_restore_recursion(int dev, off_t bufpos, size_t buflen, off_t *pos,
4357	jermar	58	fs_node_t *pfn)
3103	jermar	59	{
		60	struct rdentry entry;
		61	libfs_ops_t *ops = &tmpfs_libfs_ops;
3625	jermar	62	int rc;
3103	jermar	63
		64	do {
		65	char *fname;
4357	jermar	66	fs_node_t *fn;
4370	jermar	67	tmpfs_node_t *nodep;
3103	jermar	68	uint32_t size;
		69
3538	jermar	70	if (block_read(dev, bufpos, buflen, pos, &entry, sizeof(entry),
		71	TMPFS_BLOCK_SIZE) != EOK)
3103	jermar	72	return false;
		73
		74	entry.len = uint32_t_le2host(entry.len);
		75
		76	switch (entry.type) {
3247	jermar	77	case TMPFS_NONE:
3103	jermar	78	break;
3247	jermar	79	case TMPFS_FILE:
3103	jermar	80	fname = malloc(entry.len + 1);
		81	if (fname == NULL)
		82	return false;
		83
4357	jermar	84	fn = ops->create(dev, L_FILE);
		85	if (fn == NULL) {
3103	jermar	86	free(fname);
		87	return false;
		88	}
		89
3538	jermar	90	if (block_read(dev, bufpos, buflen, pos, fname,
		91	entry.len, TMPFS_BLOCK_SIZE) != EOK) {
4357	jermar	92	ops->destroy(fn);
3103	jermar	93	free(fname);
		94	return false;
		95	}
		96	fname[entry.len] = 0;
		97
4357	jermar	98	rc = ops->link(pfn, fn, fname);
3625	jermar	99	if (rc != EOK) {
4357	jermar	100	ops->destroy(fn);
3103	jermar	101	free(fname);
		102	return false;
		103	}
		104	free(fname);
		105
3538	jermar	106	if (block_read(dev, bufpos, buflen, pos, &size,
		107	sizeof(size), TMPFS_BLOCK_SIZE) != EOK)
3103	jermar	108	return false;
		109
		110	size = uint32_t_le2host(size);
		111
4357	jermar	112	nodep = TMPFS_NODE(fn);
		113	nodep->data = malloc(size);
		114	if (nodep->data == NULL)
3103	jermar	115	return false;
		116
4357	jermar	117	nodep->size = size;
		118	if (block_read(dev, bufpos, buflen, pos, nodep->data,
3538	jermar	119	size, TMPFS_BLOCK_SIZE) != EOK)
3103	jermar	120	return false;
		121
		122	break;
3247	jermar	123	case TMPFS_DIRECTORY:
3103	jermar	124	fname = malloc(entry.len + 1);
		125	if (fname == NULL)
		126	return false;
		127
4357	jermar	128	fn = ops->create(dev, L_DIRECTORY);
		129	if (fn == NULL) {
3103	jermar	130	free(fname);
		131	return false;
		132	}
		133
3538	jermar	134	if (block_read(dev, bufpos, buflen, pos, fname,
		135	entry.len, TMPFS_BLOCK_SIZE) != EOK) {
4357	jermar	136	ops->destroy(fn);
3103	jermar	137	free(fname);
		138	return false;
		139	}
		140	fname[entry.len] = 0;
3625	jermar	141
4357	jermar	142	rc = ops->link(pfn, fn, fname);
3625	jermar	143	if (rc != EOK) {
4357	jermar	144	ops->destroy(fn);
3103	jermar	145	free(fname);
		146	return false;
		147	}
		148	free(fname);
		149
3530	jermar	150	if (!tmpfs_restore_recursion(dev, bufpos, buflen, pos,
4357	jermar	151	fn))
3103	jermar	152	return false;
		153
		154	break;
		155	default:
		156	return false;
		157	}
3247	jermar	158	} while (entry.type != TMPFS_NONE);
3103	jermar	159
		160	return true;
		161	}
		162
		163	bool tmpfs_restore(dev_handle_t dev)
		164	{
		165	libfs_ops_t *ops = &tmpfs_libfs_ops;
3530	jermar	166	int rc;
3103	jermar	167
3537	jermar	168	rc = block_init(dev, TMPFS_BLOCK_SIZE);
3530	jermar	169	if (rc != EOK)
		170	return false;
3103	jermar	171
3252	jermar	172	off_t bufpos = 0;
3103	jermar	173	size_t buflen = 0;
3252	jermar	174	off_t pos = 0;
3103	jermar	175
		176	char tag[6];
3538	jermar	177	if (block_read(dev, &bufpos, &buflen, &pos, tag, 5,
		178	TMPFS_BLOCK_SIZE) != EOK)
3103	jermar	179	goto error;
		180
		181	tag[5] = 0;
4264	svoboda	182	if (str_cmp(tag, "TMPFS") != 0)
3103	jermar	183	goto error;
		184
3530	jermar	185	if (!tmpfs_restore_recursion(dev, &bufpos, &buflen, &pos,
3103	jermar	186	ops->root_get(dev)))
		187	goto error;
		188
3530	jermar	189	block_fini(dev);
3103	jermar	190	return true;
		191
		192	error:
3530	jermar	193	block_fini(dev);
3103	jermar	194	return false;
		195	}
		196
		197	/**
		198	* @}
		199	*/

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(root)/trunk/uspace/srv/fs/tmpfs/tmpfs_dump.c – Rev 4370