WebSVN – HelenOS – Blame – /branches/dynload/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>
3535	svoboda	46	#include <libblock.h>
3103	jermar	47	#include <byteorder.h>
		48
3403	svoboda	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
3535	svoboda	57	tmpfs_restore_recursion(int dev, off_t bufpos, size_t buflen, off_t *pos,
		58	tmpfs_dentry_t *parent)
3103	jermar	59	{
		60	struct rdentry entry;
		61	libfs_ops_t *ops = &tmpfs_libfs_ops;
		62
		63	do {
		64	char *fname;
		65	tmpfs_dentry_t *node;
		66	uint32_t size;
		67
3561	svoboda	68	if (block_read(dev, bufpos, buflen, pos, &entry, sizeof(entry),
		69	TMPFS_BLOCK_SIZE) != EOK)
3103	jermar	70	return false;
		71
		72	entry.len = uint32_t_le2host(entry.len);
		73
		74	switch (entry.type) {
3403	svoboda	75	case TMPFS_NONE:
3103	jermar	76	break;
3403	svoboda	77	case TMPFS_FILE:
3103	jermar	78	fname = malloc(entry.len + 1);
		79	if (fname == NULL)
		80	return false;
		81
		82	node = (tmpfs_dentry_t *) ops->create(L_FILE);
		83	if (node == NULL) {
		84	free(fname);
		85	return false;
		86	}
		87
3561	svoboda	88	if (block_read(dev, bufpos, buflen, pos, fname,
		89	entry.len, TMPFS_BLOCK_SIZE) != EOK) {
3103	jermar	90	ops->destroy((void *) node);
		91	free(fname);
		92	return false;
		93	}
		94	fname[entry.len] = 0;
		95
		96	if (!ops->link((void ) parent, (void ) node, fname)) {
		97	ops->destroy((void *) node);
		98	free(fname);
		99	return false;
		100	}
		101	free(fname);
		102
3561	svoboda	103	if (block_read(dev, bufpos, buflen, pos, &size,
		104	sizeof(size), TMPFS_BLOCK_SIZE) != EOK)
3103	jermar	105	return false;
		106
		107	size = uint32_t_le2host(size);
		108
		109	node->data = malloc(size);
		110	if (node->data == NULL)
		111	return false;
		112
		113	node->size = size;
3561	svoboda	114	if (block_read(dev, bufpos, buflen, pos, node->data,
		115	size, TMPFS_BLOCK_SIZE) != EOK)
3103	jermar	116	return false;
		117
		118	break;
3403	svoboda	119	case TMPFS_DIRECTORY:
3103	jermar	120	fname = malloc(entry.len + 1);
		121	if (fname == NULL)
		122	return false;
		123
		124	node = (tmpfs_dentry_t *) ops->create(L_DIRECTORY);
		125	if (node == NULL) {
		126	free(fname);
		127	return false;
		128	}
		129
3561	svoboda	130	if (block_read(dev, bufpos, buflen, pos, fname,
		131	entry.len, TMPFS_BLOCK_SIZE) != EOK) {
3103	jermar	132	ops->destroy((void *) node);
		133	free(fname);
		134	return false;
		135	}
		136	fname[entry.len] = 0;
		137
		138	if (!ops->link((void ) parent, (void ) node, fname)) {
		139	ops->destroy((void *) node);
		140	free(fname);
		141	return false;
		142	}
		143	free(fname);
		144
3535	svoboda	145	if (!tmpfs_restore_recursion(dev, bufpos, buflen, pos,
		146	node))
3103	jermar	147	return false;
		148
		149	break;
		150	default:
		151	return false;
		152	}
3403	svoboda	153	} while (entry.type != TMPFS_NONE);
3103	jermar	154
		155	return true;
		156	}
		157
		158	bool tmpfs_restore(dev_handle_t dev)
		159	{
		160	libfs_ops_t *ops = &tmpfs_libfs_ops;
3535	svoboda	161	int rc;
3103	jermar	162
3561	svoboda	163	rc = block_init(dev, TMPFS_BLOCK_SIZE);
3535	svoboda	164	if (rc != EOK)
		165	return false;
3103	jermar	166
3403	svoboda	167	off_t bufpos = 0;
3103	jermar	168	size_t buflen = 0;
3403	svoboda	169	off_t pos = 0;
3103	jermar	170
		171	char tag[6];
3561	svoboda	172	if (block_read(dev, &bufpos, &buflen, &pos, tag, 5,
		173	TMPFS_BLOCK_SIZE) != EOK)
3103	jermar	174	goto error;
		175
		176	tag[5] = 0;
		177	if (strcmp(tag, "TMPFS") != 0)
		178	goto error;
		179
3535	svoboda	180	if (!tmpfs_restore_recursion(dev, &bufpos, &buflen, &pos,
3103	jermar	181	ops->root_get(dev)))
		182	goto error;
		183
3535	svoboda	184	block_fini(dev);
3103	jermar	185	return true;
		186
		187	error:
3535	svoboda	188	block_fini(dev);
3103	jermar	189	return false;
		190	}
		191
		192	/**
		193	* @}
		194	*/

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