yaffs_fs.c

yaffs2 lastest sourcecode~~

	dev->inbandTags = options.inband_tags;

	/* ... and the functions. */
	if (yaffsVersion == 2) {
		dev->writeChunkWithTagsToNAND =
		    nandmtd2_WriteChunkWithTagsToNAND;
		dev->readChunkWithTagsFromNAND =
		    nandmtd2_ReadChunkWithTagsFromNAND;
		dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
		dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
		dev->spareBuffer = YMALLOC(mtd->oobsize);
		dev->isYaffs2 = 1;
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
		dev->totalBytesPerChunk = mtd->writesize;
		dev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
#else
		dev->totalBytesPerChunk = mtd->oobblock;
		dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
#endif
		nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize);

		dev->startBlock = 0;
		dev->endBlock = nBlocks - 1;
	} else {
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
		/* use the MTD interface in yaffs_mtdif1.c */
		dev->writeChunkWithTagsToNAND =
			nandmtd1_WriteChunkWithTagsToNAND;
		dev->readChunkWithTagsFromNAND =
			nandmtd1_ReadChunkWithTagsFromNAND;
		dev->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
		dev->queryNANDBlock = nandmtd1_QueryNANDBlock;
#else
		dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
		dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
#endif
		dev->isYaffs2 = 0;
	}
	/* ... and common functions */
	dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
	dev->initialiseNAND = nandmtd_InitialiseNAND;

	dev->putSuperFunc = yaffs_MTDPutSuper;

	dev->superBlock = (void *)sb;
	dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;


#ifndef CONFIG_YAFFS_DOES_ECC
	dev->useNANDECC = 1;
#endif

#ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
	dev->wideTnodesDisabled = 1;
#endif

	dev->skipCheckpointRead = options.skip_checkpoint_read;
	dev->skipCheckpointWrite = options.skip_checkpoint_write;

	/* we assume this is protected by lock_kernel() in mount/umount */
	ylist_add_tail(&dev->devList, &yaffs_dev_list);

	init_MUTEX(&dev->grossLock);

	yaffs_GrossLock(dev);

	err = yaffs_GutsInitialise(dev);

	T(YAFFS_TRACE_OS,
	  ("yaffs_read_super: guts initialised %s\n",
	   (err == YAFFS_OK) ? "OK" : "FAILED"));

	/* Release lock before yaffs_get_inode() */
	yaffs_GrossUnlock(dev);

	/* Create root inode */
	if (err == YAFFS_OK)
		inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
					yaffs_Root(dev));

	if (!inode)
		return NULL;

	inode->i_op = &yaffs_dir_inode_operations;
	inode->i_fop = &yaffs_dir_operations;

	T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));

	root = d_alloc_root(inode);

	T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));

	if (!root) {
		iput(inode);
		return NULL;
	}
	sb->s_root = root;
	sb->s_dirt = !dev->isCheckpointed;
	T(YAFFS_TRACE_ALWAYS,
	  ("yaffs_read_super: isCheckpointed %d\n", dev->isCheckpointed));

	T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
	return sb;
}


#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
					 int silent)
{
	return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
}

#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
static int yaffs_read_super(struct file_system_type *fs,
			    int flags, const char *dev_name,
			    void *data, struct vfsmount *mnt)
{

	return get_sb_bdev(fs, flags, dev_name, data,
			   yaffs_internal_read_super_mtd, mnt);
}
#else
static struct super_block *yaffs_read_super(struct file_system_type *fs,
					    int flags, const char *dev_name,
					    void *data)
{

	return get_sb_bdev(fs, flags, dev_name, data,
			   yaffs_internal_read_super_mtd);
}
#endif

static struct file_system_type yaffs_fs_type = {
	.owner = THIS_MODULE,
	.name = "yaffs",
	.get_sb = yaffs_read_super,
	.kill_sb = kill_block_super,
	.fs_flags = FS_REQUIRES_DEV,
};
#else
static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
					    int silent)
{
	return yaffs_internal_read_super(1, sb, data, silent);
}

static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
		      FS_REQUIRES_DEV);
#endif


#ifdef CONFIG_YAFFS_YAFFS2

#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
					  int silent)
{
	return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
}

#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
static int yaffs2_read_super(struct file_system_type *fs,
			int flags, const char *dev_name, void *data,
			struct vfsmount *mnt)
{
	return get_sb_bdev(fs, flags, dev_name, data,
			yaffs2_internal_read_super_mtd, mnt);
}
#else
static struct super_block *yaffs2_read_super(struct file_system_type *fs,
					     int flags, const char *dev_name,
					     void *data)
{

	return get_sb_bdev(fs, flags, dev_name, data,
			   yaffs2_internal_read_super_mtd);
}
#endif

static struct file_system_type yaffs2_fs_type = {
	.owner = THIS_MODULE,
	.name = "yaffs2",
	.get_sb = yaffs2_read_super,
	.kill_sb = kill_block_super,
	.fs_flags = FS_REQUIRES_DEV,
};
#else
static struct super_block *yaffs2_read_super(struct super_block *sb,
					     void *data, int silent)
{
	return yaffs_internal_read_super(2, sb, data, silent);
}

static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
		      FS_REQUIRES_DEV);
#endif

#endif				/* CONFIG_YAFFS_YAFFS2 */

static struct proc_dir_entry *my_proc_entry;

static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
{
	buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
	buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
	buf += sprintf(buf, "totalBytesPerChunk. %d\n", dev->totalBytesPerChunk);
	buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
	buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
	buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
	buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
	buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->nReservedBlocks);
	buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
	buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
	buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
	buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
	buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
	buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
	buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
	buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
	buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
	buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
	buf += sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
	buf += sprintf(buf, "passiveGCs......... %d\n",
		    dev->passiveGarbageCollections);
	buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
	buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->nShortOpCaches);
	buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
	buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
	buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
	buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
	buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
	buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
	buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
	buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
	buf +=
	    sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
	buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
	buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
	buf += sprintf(buf, "inbandTags......... %d\n", dev->inbandTags);

	return buf;
}

static int yaffs_proc_read(char *page,
			   char **start,
			   off_t offset, int count, int *eof, void *data)
{
	struct ylist_head *item;
	char *buf = page;
	int step = offset;
	int n = 0;

	/* Get proc_file_read() to step 'offset' by one on each sucessive call.
	 * We use 'offset' (*ppos) to indicate where we are in devList.
	 * This also assumes the user has posted a read buffer large
	 * enough to hold the complete output; but that's life in /proc.
	 */

	*(int *)start = 1;

	/* Print header first */
	if (step == 0) {
		buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
			       "\n%s\n%s\n", yaffs_fs_c_version,
			       yaffs_guts_c_version);
	}

	/* hold lock_kernel while traversing yaffs_dev_list */
	lock_kernel();

	/* Locate and print the Nth entry.  Order N-squared but N is small. */
	ylist_for_each(item, &yaffs_dev_list) {
		yaffs_Device *dev = ylist_entry(item, yaffs_Device, devList);
		if (n < step) {
			n++;
			continue;
		}
		buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
		buf = yaffs_dump_dev(buf, dev);
		break;
	}
	unlock_kernel();

	return buf - page < count ? buf - page : count;
}

/**
 * Set the verbosity of the warnings and error messages.
 *
 * Note that the names can only be a..z or _ with the current code.
 */

static struct {
	char *mask_name;
	unsigned mask_bitfield;
} mask_flags[] = {
	{"allocate", YAFFS_TRACE_ALLOCATE},
	{"always", YAFFS_TRACE_ALWAYS},
	{"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
	{"buffers", YAFFS_TRACE_BUFFERS},
	{"bug", YAFFS_TRACE_BUG},
	{"checkpt", YAFFS_TRACE_CHECKPOINT},
	{"deletion", YAFFS_TRACE_DELETION},
	{"erase", YAFFS_TRACE_ERASE},
	{"error", YAFFS_TRACE_ERROR},
	{"gc_detail", YAFFS_TRACE_GC_DETAIL},
	{"gc", YAFFS_TRACE_GC},
	{"mtd", YAFFS_TRACE_MTD},
	{"nandaccess", YAFFS_TRACE_NANDACCESS},
	{"os", YAFFS_TRACE_OS},
	{"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
	{"scan", YAFFS_TRACE_SCAN},
	{"tracing", YAFFS_TRACE_TRACING},

	{"verify", YAFFS_TRACE_VERIFY},
	{"verify_nand", YAFFS_TRACE_VERIFY_NAND},
	{"verify_full", YAFFS_TRACE_VERIFY_FULL},
	{"verify_all", YAFFS_TRACE_VERIFY_ALL},

	{"write", YAFFS_TRACE_WRITE},
	{"all", 0xffffffff},
	{"none", 0},
	{NULL, 0},
};

#define MAX_MASK_NAME_LENGTH 40
static int yaffs_proc_write(struct file *file, const char *buf,
					 unsigned long count, void *data)
{
	unsigned rg = 0, mask_bitfield;
	char *end;
	char *mask_name;
	const char *x;
	char substring[MAX_MASK_NAME_LENGTH + 1];
	int i;
	int done = 0;
	int add, len = 0;
	int pos = 0;

	rg = yaffs_traceMask;

	while (!done && (pos < count)) {
		done = 1;
		while ((pos < count) && isspace(buf[pos]))
			pos++;

		switch (buf[pos]) {
		case '+':
		case '-':
		case '=':
			add = buf[pos];
			pos++;
			break;

		default:
			add = ' ';
			break;
		}
		mask_name = NULL;

		mask_bitfield = simple_strtoul(buf + pos, &end, 0);

		if (end > buf + pos) {
			mask_name = "numeral";
			len = end - (buf + pos);
			pos += len;
			done = 0;
		} else {
			for (x = buf + pos, i = 0;
			    (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
			    i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
				substring[i] = *x;
			substring[i] = '\0';

			for (i = 0; mask_flags[i].mask_name != NULL; i++) {
				if (strcmp(substring, mask_flags[i].mask_name) == 0) {
					mask_name = mask_flags[i].mask_name;
					mask_bitfield = mask_flags[i].mask_bitfield;
					done = 0;
					break;
				}
			}
		}

		if (mask_name != NULL) {
			done = 0;
			switch (add) {
			case '-':
				rg &= ~mask_bitfield;
				break;
			case '+':
				rg |= mask_bitfield;
				break;
			case '=':
				rg = mask_bitfield;
				break;
			default:
				rg |= mask_bitfield;
				break;
			}
		}
	}

	yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;

	printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_traceMask);

	if (rg & YAFFS_TRACE_ALWAYS) {
		for (i = 0; mask_flags[i].mask_name != NULL; i++) {
			char flag;
			flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
			printk(KERN_DEBUG "%c%s\n", flag, mask_flags[i].mask_name);
		}
	}

	return count;
}

/* Stuff to handle installation of file systems */
struct file_system_to_install {
	struct file_system_type *fst;
	int installed;
};

static struct file_system_to_install fs_to_install[] = {
	{&yaffs_fs_type, 0},
	{&yaffs2_fs_type, 0},
	{NULL, 0}
};

static int __init init_yaffs_fs(void)
{
	int error = 0;
	struct file_system_to_install *fsinst;

	T(YAFFS_TRACE_ALWAYS,
	  ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));

	/* Install the proc_fs entry */
	my_proc_entry = create_proc_entry("yaffs",
					       S_IRUGO | S_IFREG,
					       YPROC_ROOT);

	if (my_proc_entry) {
		my_proc_entry->write_proc = yaffs_proc_write;
		my_proc_entry->read_proc = yaffs_proc_read;
		my_proc_entry->data = NULL;
	} else
		return -ENOMEM;

	/* Now add the file system entries */

	fsinst = fs_to_install;

	while (fsinst->fst && !error) {
		error = register_filesystem(fsinst->fst);
		if (!error)
			fsinst->installed = 1;
		fsinst++;
	}

	/* Any errors? uninstall  */
	if (error) {
		fsinst = fs_to_install;

		while (fsinst->fst) {
			if (fsinst->installed) {
				unregister_filesystem(fsinst->fst);
				fsinst->installed = 0;
			}
			fsinst++;
		}
	}

	return error;
}

static void __exit exit_yaffs_fs(void)
{

	struct file_system_to_install *fsinst;

	T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
			       " removing. \n"));

	remove_proc_entry("yaffs", YPROC_ROOT);

	fsinst = fs_to_install;

	while (fsinst->fst) {
		if (fsinst->installed) {
			unregister_filesystem(fsinst->fst);
			fsinst->installed = 0;
		}
		fsinst++;
	}
}

module_init(init_yaffs_fs)
module_exit(exit_yaffs_fs)

MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
MODULE_LICENSE("GPL");