[net-next-2.6.git] / fs / omfs / inode.c

/*
 * Optimized MPEG FS - inode and super operations.
 * Copyright (C) 2006 Bob Copeland <me@bobcopeland.com>
 * Released under GPL v2.
 */
#include <linux/version.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/vfs.h>
#include <linux/parser.h>
#include <linux/buffer_head.h>
#include <linux/vmalloc.h>
#include <linux/writeback.h>
#include <linux/crc-itu-t.h>
#include "omfs.h"

MODULE_AUTHOR("Bob Copeland <me@bobcopeland.com>");
MODULE_DESCRIPTION("OMFS (ReplayTV/Karma) Filesystem for Linux");
MODULE_LICENSE("GPL");

struct inode *omfs_new_inode(struct inode *dir, int mode)
{
	struct inode *inode;
	u64 new_block;
	int err;
	int len;
	struct omfs_sb_info *sbi = OMFS_SB(dir->i_sb);

	inode = new_inode(dir->i_sb);
	if (!inode)
		return ERR_PTR(-ENOMEM);

	err = omfs_allocate_range(dir->i_sb, sbi->s_mirrors, sbi->s_mirrors,
			&new_block, &len);
	if (err)
		goto fail;

	inode->i_ino = new_block;
	inode->i_mode = mode;
	inode->i_uid = current_fsuid();
	inode->i_gid = current_fsgid();
	inode->i_mapping->a_ops = &omfs_aops;

	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	switch (mode & S_IFMT) {
	case S_IFDIR:
		inode->i_op = &omfs_dir_inops;
		inode->i_fop = &omfs_dir_operations;
		inode->i_size = sbi->s_sys_blocksize;
		inc_nlink(inode);
		break;
	case S_IFREG:
		inode->i_op = &omfs_file_inops;
		inode->i_fop = &omfs_file_operations;
		inode->i_size = 0;
		break;
	}

	insert_inode_hash(inode);
	mark_inode_dirty(inode);
	return inode;
fail:
	make_bad_inode(inode);
	iput(inode);
	return ERR_PTR(err);
}

/*
 * Update the header checksums for a dirty inode based on its contents.
 * Caller is expected to hold the buffer head underlying oi and mark it
 * dirty.
 */
static void omfs_update_checksums(struct omfs_inode *oi)
{
	int xor, i, ofs = 0, count;
	u16 crc = 0;
	unsigned char *ptr = (unsigned char *) oi;

	count = be32_to_cpu(oi->i_head.h_body_size);
	ofs = sizeof(struct omfs_header);

	crc = crc_itu_t(crc, ptr + ofs, count);
	oi->i_head.h_crc = cpu_to_be16(crc);

	xor = ptr[0];
	for (i = 1; i < OMFS_XOR_COUNT; i++)
		xor ^= ptr[i];

	oi->i_head.h_check_xor = xor;
}

static int __omfs_write_inode(struct inode *inode, int wait)
{
	struct omfs_inode *oi;
	struct omfs_sb_info *sbi = OMFS_SB(inode->i_sb);
	struct buffer_head *bh, *bh2;
	unsigned int block;
	u64 ctime;
	int i;
	int ret = -EIO;
	int sync_failed = 0;

	/* get current inode since we may have written sibling ptrs etc. */
	block = clus_to_blk(sbi, inode->i_ino);
	bh = sb_bread(inode->i_sb, block);
	if (!bh)
		goto out;

	oi = (struct omfs_inode *) bh->b_data;

	oi->i_head.h_self = cpu_to_be64(inode->i_ino);
	if (S_ISDIR(inode->i_mode))
		oi->i_type = OMFS_DIR;
	else if (S_ISREG(inode->i_mode))
		oi->i_type = OMFS_FILE;
	else {
		printk(KERN_WARNING "omfs: unknown file type: %d\n",
			inode->i_mode);
		goto out_brelse;
	}

	oi->i_head.h_body_size = cpu_to_be32(sbi->s_sys_blocksize -
		sizeof(struct omfs_header));
	oi->i_head.h_version = 1;
	oi->i_head.h_type = OMFS_INODE_NORMAL;
	oi->i_head.h_magic = OMFS_IMAGIC;
	oi->i_size = cpu_to_be64(inode->i_size);

	ctime = inode->i_ctime.tv_sec * 1000LL +
		((inode->i_ctime.tv_nsec + 999)/1000);
	oi->i_ctime = cpu_to_be64(ctime);

	omfs_update_checksums(oi);

	mark_buffer_dirty(bh);
	if (wait) {
		sync_dirty_buffer(bh);
		if (buffer_req(bh) && !buffer_uptodate(bh))
			sync_failed = 1;
	}

	/* if mirroring writes, copy to next fsblock */
	for (i = 1; i < sbi->s_mirrors; i++) {
		bh2 = sb_bread(inode->i_sb, block + i *
			(sbi->s_blocksize / sbi->s_sys_blocksize));
		if (!bh2)
			goto out_brelse;

		memcpy(bh2->b_data, bh->b_data, bh->b_size);
		mark_buffer_dirty(bh2);
		if (wait) {
			sync_dirty_buffer(bh2);
			if (buffer_req(bh2) && !buffer_uptodate(bh2))
				sync_failed = 1;
		}
		brelse(bh2);
	}
	ret = (sync_failed) ? -EIO : 0;
out_brelse:
	brelse(bh);
out:
	return ret;
}

static int omfs_write_inode(struct inode *inode, struct writeback_control *wbc)
{
	return __omfs_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
}

int omfs_sync_inode(struct inode *inode)
{
	return __omfs_write_inode(inode, 1);
}

/*
 * called when an entry is deleted, need to clear the bits in the
 * bitmaps.
 */
static void omfs_delete_inode(struct inode *inode)
{
	truncate_inode_pages(&inode->i_data, 0);

	if (S_ISREG(inode->i_mode)) {
		inode->i_size = 0;
		omfs_shrink_inode(inode);
	}

	omfs_clear_range(inode->i_sb, inode->i_ino, 2);
	clear_inode(inode);
}

struct inode *omfs_iget(struct super_block *sb, ino_t ino)
{
	struct omfs_sb_info *sbi = OMFS_SB(sb);
	struct omfs_inode *oi;
	struct buffer_head *bh;
	unsigned int block;
	u64 ctime;
	unsigned long nsecs;
	struct inode *inode;

	inode = iget_locked(sb, ino);
	if (!inode)
		return ERR_PTR(-ENOMEM);
	if (!(inode->i_state & I_NEW))
		return inode;

	block = clus_to_blk(sbi, ino);
	bh = sb_bread(inode->i_sb, block);
	if (!bh)
		goto iget_failed;

	oi = (struct omfs_inode *)bh->b_data;

	/* check self */
	if (ino != be64_to_cpu(oi->i_head.h_self))
		goto fail_bh;

	inode->i_uid = sbi->s_uid;
	inode->i_gid = sbi->s_gid;

	ctime = be64_to_cpu(oi->i_ctime);
	nsecs = do_div(ctime, 1000) * 1000L;

	inode->i_atime.tv_sec = ctime;
	inode->i_mtime.tv_sec = ctime;
	inode->i_ctime.tv_sec = ctime;
	inode->i_atime.tv_nsec = nsecs;
	inode->i_mtime.tv_nsec = nsecs;
	inode->i_ctime.tv_nsec = nsecs;

	inode->i_mapping->a_ops = &omfs_aops;

	switch (oi->i_type) {
	case OMFS_DIR:
		inode->i_mode = S_IFDIR | (S_IRWXUGO & ~sbi->s_dmask);
		inode->i_op = &omfs_dir_inops;
		inode->i_fop = &omfs_dir_operations;
		inode->i_size = sbi->s_sys_blocksize;
		inc_nlink(inode);
		break;
	case OMFS_FILE:
		inode->i_mode = S_IFREG | (S_IRWXUGO & ~sbi->s_fmask);
		inode->i_fop = &omfs_file_operations;
		inode->i_size = be64_to_cpu(oi->i_size);
		break;
	}
	brelse(bh);
	unlock_new_inode(inode);
	return inode;
fail_bh:
	brelse(bh);
iget_failed:
	iget_failed(inode);
	return ERR_PTR(-EIO);
}

static void omfs_put_super(struct super_block *sb)
{
	struct omfs_sb_info *sbi = OMFS_SB(sb);
	kfree(sbi->s_imap);
	kfree(sbi);
	sb->s_fs_info = NULL;
}

static int omfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct super_block *s = dentry->d_sb;
	struct omfs_sb_info *sbi = OMFS_SB(s);
	u64 id = huge_encode_dev(s->s_bdev->bd_dev);

	buf->f_type = OMFS_MAGIC;
	buf->f_bsize = sbi->s_blocksize;
	buf->f_blocks = sbi->s_num_blocks;
	buf->f_files = sbi->s_num_blocks;
	buf->f_namelen = OMFS_NAMELEN;
	buf->f_fsid.val[0] = (u32)id;
	buf->f_fsid.val[1] = (u32)(id >> 32);

	buf->f_bfree = buf->f_bavail = buf->f_ffree =
		omfs_count_free(s);

	return 0;
}

static const struct super_operations omfs_sops = {
	.write_inode	= omfs_write_inode,
	.delete_inode	= omfs_delete_inode,
	.put_super	= omfs_put_super,
	.statfs		= omfs_statfs,
	.show_options	= generic_show_options,
};

/*
 * For Rio Karma, there is an on-disk free bitmap whose location is
 * stored in the root block.  For ReplayTV, there is no such free bitmap
 * so we have to walk the tree.  Both inodes and file data are allocated
 * from the same map.  This array can be big (300k) so we allocate
 * in units of the blocksize.
 */
static int omfs_get_imap(struct super_block *sb)
{
	int bitmap_size;
	int array_size;
	int count;
	struct omfs_sb_info *sbi = OMFS_SB(sb);
	struct buffer_head *bh;
	unsigned long **ptr;
	sector_t block;

	bitmap_size = DIV_ROUND_UP(sbi->s_num_blocks, 8);
	array_size = DIV_ROUND_UP(bitmap_size, sb->s_blocksize);

	if (sbi->s_bitmap_ino == ~0ULL)
		goto out;

	sbi->s_imap_size = array_size;
	sbi->s_imap = kzalloc(array_size * sizeof(unsigned long *), GFP_KERNEL);
	if (!sbi->s_imap)
		goto nomem;

	block = clus_to_blk(sbi, sbi->s_bitmap_ino);
	ptr = sbi->s_imap;
	for (count = bitmap_size; count > 0; count -= sb->s_blocksize) {
		bh = sb_bread(sb, block++);
		if (!bh)
			goto nomem_free;
		*ptr = kmalloc(sb->s_blocksize, GFP_KERNEL);
		if (!*ptr) {
			brelse(bh);
			goto nomem_free;
		}
		memcpy(*ptr, bh->b_data, sb->s_blocksize);
		if (count < sb->s_blocksize)
			memset((void *)*ptr + count, 0xff,
				sb->s_blocksize - count);
		brelse(bh);
		ptr++;
	}
out:
	return 0;

nomem_free:
	for (count = 0; count < array_size; count++)
		kfree(sbi->s_imap[count]);

	kfree(sbi->s_imap);
nomem:
	sbi->s_imap = NULL;
	sbi->s_imap_size = 0;
	return -ENOMEM;
}

enum {
	Opt_uid, Opt_gid, Opt_umask, Opt_dmask, Opt_fmask
};

static const match_table_t tokens = {
	{Opt_uid, "uid=%u"},
	{Opt_gid, "gid=%u"},
	{Opt_umask, "umask=%o"},
	{Opt_dmask, "dmask=%o"},
	{Opt_fmask, "fmask=%o"},
};

static int parse_options(char *options, struct omfs_sb_info *sbi)
{
	char *p;
	substring_t args[MAX_OPT_ARGS];
	int option;

	if (!options)
		return 1;

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

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_uid:
			if (match_int(&args[0], &option))
				return 0;
			sbi->s_uid = option;
			break;
		case Opt_gid:
			if (match_int(&args[0], &option))
				return 0;
			sbi->s_gid = option;
			break;
		case Opt_umask:
			if (match_octal(&args[0], &option))
				return 0;
			sbi->s_fmask = sbi->s_dmask = option;
			break;
		case Opt_dmask:
			if (match_octal(&args[0], &option))
				return 0;
			sbi->s_dmask = option;
			break;
		case Opt_fmask:
			if (match_octal(&args[0], &option))
				return 0;
			sbi->s_fmask = option;
			break;
		default:
			return 0;
		}
	}
	return 1;
}

static int omfs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct buffer_head *bh, *bh2;
	struct omfs_super_block *omfs_sb;
	struct omfs_root_block *omfs_rb;
	struct omfs_sb_info *sbi;
	struct inode *root;
	sector_t start;
	int ret = -EINVAL;

	save_mount_options(sb, (char *) data);

	sbi = kzalloc(sizeof(struct omfs_sb_info), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;

	sb->s_fs_info = sbi;

	sbi->s_uid = current_uid();
	sbi->s_gid = current_gid();
	sbi->s_dmask = sbi->s_fmask = current_umask();

	if (!parse_options((char *) data, sbi))
		goto end;

	sb->s_maxbytes = 0xffffffff;

	sb_set_blocksize(sb, 0x200);

	bh = sb_bread(sb, 0);
	if (!bh)
		goto end;

	omfs_sb = (struct omfs_super_block *)bh->b_data;

	if (omfs_sb->s_magic != cpu_to_be32(OMFS_MAGIC)) {
		if (!silent)
			printk(KERN_ERR "omfs: Invalid superblock (%x)\n",
				   omfs_sb->s_magic);
		goto out_brelse_bh;
	}
	sb->s_magic = OMFS_MAGIC;

	sbi->s_num_blocks = be64_to_cpu(omfs_sb->s_num_blocks);
	sbi->s_blocksize = be32_to_cpu(omfs_sb->s_blocksize);
	sbi->s_mirrors = be32_to_cpu(omfs_sb->s_mirrors);
	sbi->s_root_ino = be64_to_cpu(omfs_sb->s_root_block);
	sbi->s_sys_blocksize = be32_to_cpu(omfs_sb->s_sys_blocksize);
	mutex_init(&sbi->s_bitmap_lock);

	if (sbi->s_sys_blocksize > PAGE_SIZE) {
		printk(KERN_ERR "omfs: sysblock size (%d) is out of range\n",
			sbi->s_sys_blocksize);
		goto out_brelse_bh;
	}

	if (sbi->s_blocksize < sbi->s_sys_blocksize ||
	    sbi->s_blocksize > OMFS_MAX_BLOCK_SIZE) {
		printk(KERN_ERR "omfs: block size (%d) is out of range\n",
			sbi->s_blocksize);
		goto out_brelse_bh;
	}

	/*
	 * Use sys_blocksize as the fs block since it is smaller than a
	 * page while the fs blocksize can be larger.
	 */
	sb_set_blocksize(sb, sbi->s_sys_blocksize);

	/*
	 * ...and the difference goes into a shift.  sys_blocksize is always
	 * a power of two factor of blocksize.
	 */
	sbi->s_block_shift = get_bitmask_order(sbi->s_blocksize) -
		get_bitmask_order(sbi->s_sys_blocksize);

	start = clus_to_blk(sbi, be64_to_cpu(omfs_sb->s_root_block));
	bh2 = sb_bread(sb, start);
	if (!bh2)
		goto out_brelse_bh;

	omfs_rb = (struct omfs_root_block *)bh2->b_data;

	sbi->s_bitmap_ino = be64_to_cpu(omfs_rb->r_bitmap);
	sbi->s_clustersize = be32_to_cpu(omfs_rb->r_clustersize);

	if (sbi->s_num_blocks != be64_to_cpu(omfs_rb->r_num_blocks)) {
		printk(KERN_ERR "omfs: block count discrepancy between "
			"super and root blocks (%llx, %llx)\n",
			(unsigned long long)sbi->s_num_blocks,
			(unsigned long long)be64_to_cpu(omfs_rb->r_num_blocks));
		goto out_brelse_bh2;
	}

	ret = omfs_get_imap(sb);
	if (ret)
		goto out_brelse_bh2;

	sb->s_op = &omfs_sops;

	root = omfs_iget(sb, be64_to_cpu(omfs_rb->r_root_dir));
	if (IS_ERR(root)) {
		ret = PTR_ERR(root);
		goto out_brelse_bh2;
	}

	sb->s_root = d_alloc_root(root);
	if (!sb->s_root) {
		iput(root);
		goto out_brelse_bh2;
	}
	printk(KERN_DEBUG "omfs: Mounted volume %s\n", omfs_rb->r_name);

	ret = 0;
out_brelse_bh2:
	brelse(bh2);
out_brelse_bh:
	brelse(bh);
end:
	return ret;
}

static int omfs_get_sb(struct file_system_type *fs_type,
			int flags, const char *dev_name,
			void *data, struct vfsmount *m)
{
	return get_sb_bdev(fs_type, flags, dev_name, data, omfs_fill_super, m);
}

static struct file_system_type omfs_fs_type = {
	.owner = THIS_MODULE,
	.name = "omfs",
	.get_sb = omfs_get_sb,
	.kill_sb = kill_block_super,
	.fs_flags = FS_REQUIRES_DEV,
};

static int __init init_omfs_fs(void)
{
	return register_filesystem(&omfs_fs_type);
}

static void __exit exit_omfs_fs(void)
{
	unregister_filesystem(&omfs_fs_type);
}

module_init(init_omfs_fs);
module_exit(exit_omfs_fs);
Commit	Line	Data
555e3775 BC	1	/*
	2	* Optimized MPEG FS - inode and super operations.
	3	* Copyright (C) 2006 Bob Copeland <me@bobcopeland.com>
	4	* Released under GPL v2.
	5	*/
	6	#include <linux/version.h>
	7	#include <linux/module.h>
	8	#include <linux/sched.h>
5a0e3ad6	9	#include <linux/slab.h>
555e3775 BC	10	#include <linux/fs.h>
	11	#include <linux/vfs.h>
	12	#include <linux/parser.h>
	13	#include <linux/buffer_head.h>
	14	#include <linux/vmalloc.h>
a9185b41	15	#include <linux/writeback.h>
555e3775 BC	16	#include <linux/crc-itu-t.h>
	17	#include "omfs.h"
	18
	19	MODULE_AUTHOR("Bob Copeland <me@bobcopeland.com>");
	20	MODULE_DESCRIPTION("OMFS (ReplayTV/Karma) Filesystem for Linux");
	21	MODULE_LICENSE("GPL");
	22
	23	struct inode omfs_new_inode(struct inode dir, int mode)
	24	{
	25	struct inode *inode;
	26	u64 new_block;
	27	int err;
	28	int len;
	29	struct omfs_sb_info *sbi = OMFS_SB(dir->i_sb);
	30
	31	inode = new_inode(dir->i_sb);
	32	if (!inode)
	33	return ERR_PTR(-ENOMEM);
	34
	35	err = omfs_allocate_range(dir->i_sb, sbi->s_mirrors, sbi->s_mirrors,
	36	&new_block, &len);
	37	if (err)
	38	goto fail;
	39
	40	inode->i_ino = new_block;
	41	inode->i_mode = mode;
c222d53e DH	42	inode->i_uid = current_fsuid();
c222d53e DH	43	inode->i_gid = current_fsgid();
555e3775 BC	44	inode->i_mapping->a_ops = &omfs_aops;
	45
	46	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	47	switch (mode & S_IFMT) {
	48	case S_IFDIR:
	49	inode->i_op = &omfs_dir_inops;
	50	inode->i_fop = &omfs_dir_operations;
	51	inode->i_size = sbi->s_sys_blocksize;
	52	inc_nlink(inode);
	53	break;
	54	case S_IFREG:
	55	inode->i_op = &omfs_file_inops;
	56	inode->i_fop = &omfs_file_operations;
	57	inode->i_size = 0;
	58	break;
	59	}
	60
	61	insert_inode_hash(inode);
	62	mark_inode_dirty(inode);
	63	return inode;
	64	fail:
	65	make_bad_inode(inode);
	66	iput(inode);
	67	return ERR_PTR(err);
	68	}
	69
	70	/*
	71	* Update the header checksums for a dirty inode based on its contents.
	72	* Caller is expected to hold the buffer head underlying oi and mark it
	73	* dirty.
	74	*/
	75	static void omfs_update_checksums(struct omfs_inode *oi)
	76	{
	77	int xor, i, ofs = 0, count;
	78	u16 crc = 0;
	79	unsigned char ptr = (unsigned char ) oi;
	80
	81	count = be32_to_cpu(oi->i_head.h_body_size);
	82	ofs = sizeof(struct omfs_header);
	83
	84	crc = crc_itu_t(crc, ptr + ofs, count);
	85	oi->i_head.h_crc = cpu_to_be16(crc);
	86
	87	xor = ptr[0];
	88	for (i = 1; i < OMFS_XOR_COUNT; i++)
	89	xor ^= ptr[i];
	90
	91	oi->i_head.h_check_xor = xor;
	92	}
	93
a9185b41	94	static int __omfs_write_inode(struct inode *inode, int wait)
555e3775 BC	95	{
	96	struct omfs_inode *oi;
	97	struct omfs_sb_info *sbi = OMFS_SB(inode->i_sb);
	98	struct buffer_head bh, bh2;
	99	unsigned int block;
	100	u64 ctime;
	101	int i;
	102	int ret = -EIO;
	103	int sync_failed = 0;
	104
	105	/* get current inode since we may have written sibling ptrs etc. */
	106	block = clus_to_blk(sbi, inode->i_ino);
	107	bh = sb_bread(inode->i_sb, block);
	108	if (!bh)
	109	goto out;
	110
	111	oi = (struct omfs_inode *) bh->b_data;
	112
	113	oi->i_head.h_self = cpu_to_be64(inode->i_ino);
	114	if (S_ISDIR(inode->i_mode))
	115	oi->i_type = OMFS_DIR;
	116	else if (S_ISREG(inode->i_mode))
	117	oi->i_type = OMFS_FILE;
	118	else {
	119	printk(KERN_WARNING "omfs: unknown file type: %d\n",
	120	inode->i_mode);
	121	goto out_brelse;
	122	}
	123
	124	oi->i_head.h_body_size = cpu_to_be32(sbi->s_sys_blocksize -
	125	sizeof(struct omfs_header));
	126	oi->i_head.h_version = 1;
	127	oi->i_head.h_type = OMFS_INODE_NORMAL;
	128	oi->i_head.h_magic = OMFS_IMAGIC;
	129	oi->i_size = cpu_to_be64(inode->i_size);
	130
	131	ctime = inode->i_ctime.tv_sec * 1000LL +
	132	((inode->i_ctime.tv_nsec + 999)/1000);
	133	oi->i_ctime = cpu_to_be64(ctime);
	134
	135	omfs_update_checksums(oi);
	136
	137	mark_buffer_dirty(bh);
	138	if (wait) {
	139	sync_dirty_buffer(bh);
	140	if (buffer_req(bh) && !buffer_uptodate(bh))
	141	sync_failed = 1;
	142	}
	143
	144	/* if mirroring writes, copy to next fsblock */
	145	for (i = 1; i < sbi->s_mirrors; i++) {
	146	bh2 = sb_bread(inode->i_sb, block + i *
	147	(sbi->s_blocksize / sbi->s_sys_blocksize));
	148	if (!bh2)
	149	goto out_brelse;
	150
	151	memcpy(bh2->b_data, bh->b_data, bh->b_size);
	152	mark_buffer_dirty(bh2);
	153	if (wait) {
	154	sync_dirty_buffer(bh2);
	155	if (buffer_req(bh2) && !buffer_uptodate(bh2))
	156	sync_failed = 1;
	157	}
	158	brelse(bh2);
159	}
160	ret = (sync_failed) ? -EIO : 0;
161	out_brelse:
162	brelse(bh);
163	out:
164	return ret;
165	}
166
a9185b41 CH	167	static int omfs_write_inode(struct inode inode, struct writeback_control wbc)
	168	{
	169	return __omfs_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
	170	}
	171
555e3775 BC	172	int omfs_sync_inode(struct inode *inode)
555e3775 BC	173	{
a9185b41	174	return __omfs_write_inode(inode, 1);
555e3775 BC	175	}
	176
	177	/*
	178	* called when an entry is deleted, need to clear the bits in the
	179	* bitmaps.
	180	*/
	181	static void omfs_delete_inode(struct inode *inode)
	182	{
	183	truncate_inode_pages(&inode->i_data, 0);
	184
	185	if (S_ISREG(inode->i_mode)) {
	186	inode->i_size = 0;
	187	omfs_shrink_inode(inode);
	188	}
	189
	190	omfs_clear_range(inode->i_sb, inode->i_ino, 2);
	191	clear_inode(inode);
	192	}
	193
	194	struct inode omfs_iget(struct super_block sb, ino_t ino)
	195	{
	196	struct omfs_sb_info *sbi = OMFS_SB(sb);
	197	struct omfs_inode *oi;
	198	struct buffer_head *bh;
	199	unsigned int block;
	200	u64 ctime;
	201	unsigned long nsecs;
	202	struct inode *inode;
	203
	204	inode = iget_locked(sb, ino);
	205	if (!inode)
	206	return ERR_PTR(-ENOMEM);
	207	if (!(inode->i_state & I_NEW))
	208	return inode;
	209
	210	block = clus_to_blk(sbi, ino);
	211	bh = sb_bread(inode->i_sb, block);
	212	if (!bh)
	213	goto iget_failed;
	214
	215	oi = (struct omfs_inode *)bh->b_data;
	216
	217	/* check self */
	218	if (ino != be64_to_cpu(oi->i_head.h_self))
	219	goto fail_bh;
	220
	221	inode->i_uid = sbi->s_uid;
	222	inode->i_gid = sbi->s_gid;
	223
	224	ctime = be64_to_cpu(oi->i_ctime);
	225	nsecs = do_div(ctime, 1000) * 1000L;
	226
	227	inode->i_atime.tv_sec = ctime;
	228	inode->i_mtime.tv_sec = ctime;
	229	inode->i_ctime.tv_sec = ctime;
	230	inode->i_atime.tv_nsec = nsecs;
	231	inode->i_mtime.tv_nsec = nsecs;
	232	inode->i_ctime.tv_nsec = nsecs;
	233
	234	inode->i_mapping->a_ops = &omfs_aops;
	235
	236	switch (oi->i_type) {
	237	case OMFS_DIR:
	238	inode->i_mode = S_IFDIR \| (S_IRWXUGO & ~sbi->s_dmask);
239	inode->i_op = &omfs_dir_inops;
240	inode->i_fop = &omfs_dir_operations;
c963343a	241	inode->i_size = sbi->s_sys_blocksize;
555e3775 BC	242	inc_nlink(inode);
	243	break;
	244	case OMFS_FILE:
	245	inode->i_mode = S_IFREG \| (S_IRWXUGO & ~sbi->s_fmask);
	246	inode->i_fop = &omfs_file_operations;
	247	inode->i_size = be64_to_cpu(oi->i_size);
	248	break;
	249	}
	250	brelse(bh);
	251	unlock_new_inode(inode);
	252	return inode;
	253	fail_bh:
	254	brelse(bh);
	255	iget_failed:
	256	iget_failed(inode);
	257	return ERR_PTR(-EIO);
	258	}
	259
	260	static void omfs_put_super(struct super_block *sb)
	261	{
	262	struct omfs_sb_info *sbi = OMFS_SB(sb);
	263	kfree(sbi->s_imap);
	264	kfree(sbi);
	265	sb->s_fs_info = NULL;
	266	}
	267
	268	static int omfs_statfs(struct dentry dentry, struct kstatfs buf)
	269	{
	270	struct super_block *s = dentry->d_sb;
	271	struct omfs_sb_info *sbi = OMFS_SB(s);
197e671e CL	272	u64 id = huge_encode_dev(s->s_bdev->bd_dev);
197e671e CL	273
555e3775 BC	274	buf->f_type = OMFS_MAGIC;
	275	buf->f_bsize = sbi->s_blocksize;
	276	buf->f_blocks = sbi->s_num_blocks;
	277	buf->f_files = sbi->s_num_blocks;
	278	buf->f_namelen = OMFS_NAMELEN;
197e671e CL	279	buf->f_fsid.val[0] = (u32)id;
197e671e CL	280	buf->f_fsid.val[1] = (u32)(id >> 32);
555e3775 BC	281
	282	buf->f_bfree = buf->f_bavail = buf->f_ffree =
	283	omfs_count_free(s);
197e671e	284
555e3775 BC	285	return 0;
	286	}
	287
b87221de	288	static const struct super_operations omfs_sops = {
555e3775 BC	289	.write_inode = omfs_write_inode,
	290	.delete_inode = omfs_delete_inode,
	291	.put_super = omfs_put_super,
	292	.statfs = omfs_statfs,
	293	.show_options = generic_show_options,
	294	};
	295
	296	/*
	297	* For Rio Karma, there is an on-disk free bitmap whose location is
	298	* stored in the root block. For ReplayTV, there is no such free bitmap
	299	* so we have to walk the tree. Both inodes and file data are allocated
	300	* from the same map. This array can be big (300k) so we allocate
	301	* in units of the blocksize.
	302	*/
	303	static int omfs_get_imap(struct super_block *sb)
	304	{
	305	int bitmap_size;
	306	int array_size;
	307	int count;
	308	struct omfs_sb_info *sbi = OMFS_SB(sb);
	309	struct buffer_head *bh;
	310	unsigned long **ptr;
	311	sector_t block;
	312
	313	bitmap_size = DIV_ROUND_UP(sbi->s_num_blocks, 8);
	314	array_size = DIV_ROUND_UP(bitmap_size, sb->s_blocksize);
	315
	316	if (sbi->s_bitmap_ino == ~0ULL)
	317	goto out;
	318
	319	sbi->s_imap_size = array_size;
	320	sbi->s_imap = kzalloc(array_size * sizeof(unsigned long *), GFP_KERNEL);
	321	if (!sbi->s_imap)
	322	goto nomem;
	323
	324	block = clus_to_blk(sbi, sbi->s_bitmap_ino);
	325	ptr = sbi->s_imap;
	326	for (count = bitmap_size; count > 0; count -= sb->s_blocksize) {
	327	bh = sb_bread(sb, block++);
	328	if (!bh)
	329	goto nomem_free;
	330	*ptr = kmalloc(sb->s_blocksize, GFP_KERNEL);
	331	if (!*ptr) {
	332	brelse(bh);
	333	goto nomem_free;
	334	}
	335	memcpy(*ptr, bh->b_data, sb->s_blocksize);
	336	if (count < sb->s_blocksize)
	337	memset((void )ptr + count, 0xff,
	338	sb->s_blocksize - count);
	339	brelse(bh);
	340	ptr++;
	341	}
	342	out:
	343	return 0;
	344
	345	nomem_free:
	346	for (count = 0; count < array_size; count++)
	347	kfree(sbi->s_imap[count]);
	348
	349	kfree(sbi->s_imap);
	350	nomem:
	351	sbi->s_imap = NULL;
	352	sbi->s_imap_size = 0;
353	return -ENOMEM;
354	}
355
356	enum {
357	Opt_uid, Opt_gid, Opt_umask, Opt_dmask, Opt_fmask
358	};
359
a447c093	360	static const match_table_t tokens = {
555e3775 BC	361	{Opt_uid, "uid=%u"},
	362	{Opt_gid, "gid=%u"},
	363	{Opt_umask, "umask=%o"},
	364	{Opt_dmask, "dmask=%o"},
	365	{Opt_fmask, "fmask=%o"},
	366	};
	367
	368	static int parse_options(char options, struct omfs_sb_info sbi)
	369	{
	370	char *p;
	371	substring_t args[MAX_OPT_ARGS];
	372	int option;
	373
	374	if (!options)
	375	return 1;
	376
	377	while ((p = strsep(&options, ",")) != NULL) {
	378	int token;
	379	if (!*p)
	380	continue;
	381
	382	token = match_token(p, tokens, args);
	383	switch (token) {
	384	case Opt_uid:
	385	if (match_int(&args[0], &option))
	386	return 0;
	387	sbi->s_uid = option;
	388	break;
	389	case Opt_gid:
	390	if (match_int(&args[0], &option))
	391	return 0;
	392	sbi->s_gid = option;
	393	break;
	394	case Opt_umask:
	395	if (match_octal(&args[0], &option))
	396	return 0;
	397	sbi->s_fmask = sbi->s_dmask = option;
	398	break;
	399	case Opt_dmask:
	400	if (match_octal(&args[0], &option))
	401	return 0;
	402	sbi->s_dmask = option;
	403	break;
	404	case Opt_fmask:
	405	if (match_octal(&args[0], &option))
	406	return 0;
	407	sbi->s_fmask = option;
	408	break;
	409	default:
	410	return 0;
	411	}
	412	}
	413	return 1;
	414	}
	415
	416	static int omfs_fill_super(struct super_block sb, void data, int silent)
	417	{
	418	struct buffer_head bh, bh2;
	419	struct omfs_super_block *omfs_sb;
	420	struct omfs_root_block *omfs_rb;
	421	struct omfs_sb_info *sbi;
	422	struct inode *root;
	423	sector_t start;
	424	int ret = -EINVAL;
425
426	save_mount_options(sb, (char *) data);
427
428	sbi = kzalloc(sizeof(struct omfs_sb_info), GFP_KERNEL);
429	if (!sbi)
430	return -ENOMEM;
431
432	sb->s_fs_info = sbi;
433
c222d53e DH	434	sbi->s_uid = current_uid();
c222d53e DH	435	sbi->s_gid = current_gid();
ce3b0f8d	436	sbi->s_dmask = sbi->s_fmask = current_umask();
555e3775 BC	437
	438	if (!parse_options((char *) data, sbi))
	439	goto end;
	440
	441	sb->s_maxbytes = 0xffffffff;
	442
	443	sb_set_blocksize(sb, 0x200);
	444
	445	bh = sb_bread(sb, 0);
	446	if (!bh)
	447	goto end;
	448
	449	omfs_sb = (struct omfs_super_block *)bh->b_data;
	450
	451	if (omfs_sb->s_magic != cpu_to_be32(OMFS_MAGIC)) {
	452	if (!silent)
	453	printk(KERN_ERR "omfs: Invalid superblock (%x)\n",
	454	omfs_sb->s_magic);
	455	goto out_brelse_bh;
	456	}
	457	sb->s_magic = OMFS_MAGIC;
	458
	459	sbi->s_num_blocks = be64_to_cpu(omfs_sb->s_num_blocks);
	460	sbi->s_blocksize = be32_to_cpu(omfs_sb->s_blocksize);
	461	sbi->s_mirrors = be32_to_cpu(omfs_sb->s_mirrors);
	462	sbi->s_root_ino = be64_to_cpu(omfs_sb->s_root_block);
	463	sbi->s_sys_blocksize = be32_to_cpu(omfs_sb->s_sys_blocksize);
	464	mutex_init(&sbi->s_bitmap_lock);
	465
	466	if (sbi->s_sys_blocksize > PAGE_SIZE) {
	467	printk(KERN_ERR "omfs: sysblock size (%d) is out of range\n",
	468	sbi->s_sys_blocksize);
	469	goto out_brelse_bh;
	470	}
	471
	472	if (sbi->s_blocksize < sbi->s_sys_blocksize \|\|
	473	sbi->s_blocksize > OMFS_MAX_BLOCK_SIZE) {
	474	printk(KERN_ERR "omfs: block size (%d) is out of range\n",
	475	sbi->s_blocksize);
	476	goto out_brelse_bh;
	477	}
	478
	479	/*
	480	* Use sys_blocksize as the fs block since it is smaller than a
	481	* page while the fs blocksize can be larger.
	482	*/
	483	sb_set_blocksize(sb, sbi->s_sys_blocksize);
	484
	485	/*
	486	* ...and the difference goes into a shift. sys_blocksize is always
	487	* a power of two factor of blocksize.
	488	*/
	489	sbi->s_block_shift = get_bitmask_order(sbi->s_blocksize) -
	490	get_bitmask_order(sbi->s_sys_blocksize);
	491
	492	start = clus_to_blk(sbi, be64_to_cpu(omfs_sb->s_root_block));
	493	bh2 = sb_bread(sb, start);
	494	if (!bh2)
	495	goto out_brelse_bh;
	496
	497	omfs_rb = (struct omfs_root_block *)bh2->b_data;
	498
	499	sbi->s_bitmap_ino = be64_to_cpu(omfs_rb->r_bitmap);
	500	sbi->s_clustersize = be32_to_cpu(omfs_rb->r_clustersize);
501
502	if (sbi->s_num_blocks != be64_to_cpu(omfs_rb->r_num_blocks)) {
503	printk(KERN_ERR "omfs: block count discrepancy between "
504	"super and root blocks (%llx, %llx)\n",
dc60bf1d AB	505	(unsigned long long)sbi->s_num_blocks,
dc60bf1d AB	506	(unsigned long long)be64_to_cpu(omfs_rb->r_num_blocks));
555e3775 BC	507	goto out_brelse_bh2;
	508	}
	509
	510	ret = omfs_get_imap(sb);
	511	if (ret)
	512	goto out_brelse_bh2;
	513
	514	sb->s_op = &omfs_sops;
	515
	516	root = omfs_iget(sb, be64_to_cpu(omfs_rb->r_root_dir));
	517	if (IS_ERR(root)) {
	518	ret = PTR_ERR(root);
	519	goto out_brelse_bh2;
	520	}
	521
	522	sb->s_root = d_alloc_root(root);
	523	if (!sb->s_root) {
	524	iput(root);
	525	goto out_brelse_bh2;
	526	}
	527	printk(KERN_DEBUG "omfs: Mounted volume %s\n", omfs_rb->r_name);
	528
	529	ret = 0;
	530	out_brelse_bh2:
	531	brelse(bh2);
	532	out_brelse_bh:
	533	brelse(bh);
	534	end:
	535	return ret;
	536	}
	537
	538	static int omfs_get_sb(struct file_system_type *fs_type,
	539	int flags, const char *dev_name,
	540	void data, struct vfsmount m)
	541	{
	542	return get_sb_bdev(fs_type, flags, dev_name, data, omfs_fill_super, m);
	543	}
	544
	545	static struct file_system_type omfs_fs_type = {
	546	.owner = THIS_MODULE,
	547	.name = "omfs",
	548	.get_sb = omfs_get_sb,
	549	.kill_sb = kill_block_super,
	550	.fs_flags = FS_REQUIRES_DEV,
	551	};
	552
	553	static int __init init_omfs_fs(void)
	554	{
	555	return register_filesystem(&omfs_fs_type);
	556	}
	557
	558	static void __exit exit_omfs_fs(void)
	559	{
	560	unregister_filesystem(&omfs_fs_type);
	561	}
	562
	563	module_init(init_omfs_fs);
	564	module_exit(exit_omfs_fs);