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

/*
 *  linux/fs/hfsplus/inode.c
 *
 * Copyright (C) 2001
 * Brad Boyer (flar@allandria.com)
 * (C) 2003 Ardis Technologies <roman@ardistech.com>
 *
 * Inode handling routines
 */

#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/mpage.h>
#include <linux/sched.h>

#include "hfsplus_fs.h"
#include "hfsplus_raw.h"

static int hfsplus_readpage(struct file *file, struct page *page)
{
	return block_read_full_page(page, hfsplus_get_block);
}

static int hfsplus_writepage(struct page *page, struct writeback_control *wbc)
{
	return block_write_full_page(page, hfsplus_get_block, wbc);
}

static int hfsplus_write_begin(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned flags,
			struct page **pagep, void **fsdata)
{
	int ret;

	*pagep = NULL;
	ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
				hfsplus_get_block,
				&HFSPLUS_I(mapping->host).phys_size);
	if (unlikely(ret)) {
		loff_t isize = mapping->host->i_size;
		if (pos + len > isize)
			vmtruncate(mapping->host, isize);
	}

	return ret;
}

static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block)
{
	return generic_block_bmap(mapping, block, hfsplus_get_block);
}

static int hfsplus_releasepage(struct page *page, gfp_t mask)
{
	struct inode *inode = page->mapping->host;
	struct super_block *sb = inode->i_sb;
	struct hfs_btree *tree;
	struct hfs_bnode *node;
	u32 nidx;
	int i, res = 1;

	switch (inode->i_ino) {
	case HFSPLUS_EXT_CNID:
		tree = HFSPLUS_SB(sb).ext_tree;
		break;
	case HFSPLUS_CAT_CNID:
		tree = HFSPLUS_SB(sb).cat_tree;
		break;
	case HFSPLUS_ATTR_CNID:
		tree = HFSPLUS_SB(sb).attr_tree;
		break;
	default:
		BUG();
		return 0;
	}
	if (!tree)
		return 0;
	if (tree->node_size >= PAGE_CACHE_SIZE) {
		nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT);
		spin_lock(&tree->hash_lock);
		node = hfs_bnode_findhash(tree, nidx);
		if (!node)
			;
		else if (atomic_read(&node->refcnt))
			res = 0;
		if (res && node) {
			hfs_bnode_unhash(node);
			hfs_bnode_free(node);
		}
		spin_unlock(&tree->hash_lock);
	} else {
		nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift);
		i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift);
		spin_lock(&tree->hash_lock);
		do {
			node = hfs_bnode_findhash(tree, nidx++);
			if (!node)
				continue;
			if (atomic_read(&node->refcnt)) {
				res = 0;
				break;
			}
			hfs_bnode_unhash(node);
			hfs_bnode_free(node);
		} while (--i && nidx < tree->node_count);
		spin_unlock(&tree->hash_lock);
	}
	return res ? try_to_free_buffers(page) : 0;
}

static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb,
		const struct iovec *iov, loff_t offset, unsigned long nr_segs)
{
	struct file *file = iocb->ki_filp;
	struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
	ssize_t ret;

	ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
				  offset, nr_segs, hfsplus_get_block, NULL);

	/*
	 * In case of error extending write may have instantiated a few
	 * blocks outside i_size. Trim these off again.
	 */
	if (unlikely((rw & WRITE) && ret < 0)) {
		loff_t isize = i_size_read(inode);
		loff_t end = offset + iov_length(iov, nr_segs);

		if (end > isize)
			vmtruncate(inode, isize);
	}

	return ret;
}

static int hfsplus_writepages(struct address_space *mapping,
			      struct writeback_control *wbc)
{
	return mpage_writepages(mapping, wbc, hfsplus_get_block);
}

const struct address_space_operations hfsplus_btree_aops = {
	.readpage	= hfsplus_readpage,
	.writepage	= hfsplus_writepage,
	.sync_page	= block_sync_page,
	.write_begin	= hfsplus_write_begin,
	.write_end	= generic_write_end,
	.bmap		= hfsplus_bmap,
	.releasepage	= hfsplus_releasepage,
};

const struct address_space_operations hfsplus_aops = {
	.readpage	= hfsplus_readpage,
	.writepage	= hfsplus_writepage,
	.sync_page	= block_sync_page,
	.write_begin	= hfsplus_write_begin,
	.write_end	= generic_write_end,
	.bmap		= hfsplus_bmap,
	.direct_IO	= hfsplus_direct_IO,
	.writepages	= hfsplus_writepages,
};

const struct dentry_operations hfsplus_dentry_operations = {
	.d_hash       = hfsplus_hash_dentry,
	.d_compare    = hfsplus_compare_dentry,
};

static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dentry,
					  struct nameidata *nd)
{
	struct hfs_find_data fd;
	struct super_block *sb = dir->i_sb;
	struct inode *inode = NULL;
	int err;

	if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
		goto out;

	inode = HFSPLUS_I(dir).rsrc_inode;
	if (inode)
		goto out;

	inode = new_inode(sb);
	if (!inode)
		return ERR_PTR(-ENOMEM);

	inode->i_ino = dir->i_ino;
	INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
	mutex_init(&HFSPLUS_I(inode).extents_lock);
	HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC;

	hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
	err = hfsplus_find_cat(sb, dir->i_ino, &fd);
	if (!err)
		err = hfsplus_cat_read_inode(inode, &fd);
	hfs_find_exit(&fd);
	if (err) {
		iput(inode);
		return ERR_PTR(err);
	}
	HFSPLUS_I(inode).rsrc_inode = dir;
	HFSPLUS_I(dir).rsrc_inode = inode;
	igrab(dir);
	hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes);
	mark_inode_dirty(inode);
out:
	d_add(dentry, inode);
	return NULL;
}

static void hfsplus_get_perms(struct inode *inode, struct hfsplus_perm *perms, int dir)
{
	struct super_block *sb = inode->i_sb;
	u16 mode;

	mode = be16_to_cpu(perms->mode);

	inode->i_uid = be32_to_cpu(perms->owner);
	if (!inode->i_uid && !mode)
		inode->i_uid = HFSPLUS_SB(sb).uid;

	inode->i_gid = be32_to_cpu(perms->group);
	if (!inode->i_gid && !mode)
		inode->i_gid = HFSPLUS_SB(sb).gid;

	if (dir) {
		mode = mode ? (mode & S_IALLUGO) :
			(S_IRWXUGO & ~(HFSPLUS_SB(sb).umask));
		mode |= S_IFDIR;
	} else if (!mode)
		mode = S_IFREG | ((S_IRUGO|S_IWUGO) &
			~(HFSPLUS_SB(sb).umask));
	inode->i_mode = mode;

	HFSPLUS_I(inode).rootflags = perms->rootflags;
	HFSPLUS_I(inode).userflags = perms->userflags;
	if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE)
		inode->i_flags |= S_IMMUTABLE;
	else
		inode->i_flags &= ~S_IMMUTABLE;
	if (perms->rootflags & HFSPLUS_FLG_APPEND)
		inode->i_flags |= S_APPEND;
	else
		inode->i_flags &= ~S_APPEND;
}

static void hfsplus_set_perms(struct inode *inode, struct hfsplus_perm *perms)
{
	if (inode->i_flags & S_IMMUTABLE)
		perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
	else
		perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
	if (inode->i_flags & S_APPEND)
		perms->rootflags |= HFSPLUS_FLG_APPEND;
	else
		perms->rootflags &= ~HFSPLUS_FLG_APPEND;
	perms->userflags = HFSPLUS_I(inode).userflags;
	perms->mode = cpu_to_be16(inode->i_mode);
	perms->owner = cpu_to_be32(inode->i_uid);
	perms->group = cpu_to_be32(inode->i_gid);
	perms->dev = cpu_to_be32(HFSPLUS_I(inode).dev);
}

static int hfsplus_file_open(struct inode *inode, struct file *file)
{
	if (HFSPLUS_IS_RSRC(inode))
		inode = HFSPLUS_I(inode).rsrc_inode;
	if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
		return -EOVERFLOW;
	atomic_inc(&HFSPLUS_I(inode).opencnt);
	return 0;
}

static int hfsplus_file_release(struct inode *inode, struct file *file)
{
	struct super_block *sb = inode->i_sb;

	if (HFSPLUS_IS_RSRC(inode))
		inode = HFSPLUS_I(inode).rsrc_inode;
	if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) {
		mutex_lock(&inode->i_mutex);
		hfsplus_file_truncate(inode);
		if (inode->i_flags & S_DEAD) {
			hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
			hfsplus_delete_inode(inode);
		}
		mutex_unlock(&inode->i_mutex);
	}
	return 0;
}

static const struct inode_operations hfsplus_file_inode_operations = {
	.lookup		= hfsplus_file_lookup,
	.truncate	= hfsplus_file_truncate,
	.setxattr	= hfsplus_setxattr,
	.getxattr	= hfsplus_getxattr,
	.listxattr	= hfsplus_listxattr,
};

static const struct file_operations hfsplus_file_operations = {
	.llseek 	= generic_file_llseek,
	.read		= do_sync_read,
	.aio_read	= generic_file_aio_read,
	.write		= do_sync_write,
	.aio_write	= generic_file_aio_write,
	.mmap		= generic_file_mmap,
	.splice_read	= generic_file_splice_read,
	.fsync		= file_fsync,
	.open		= hfsplus_file_open,
	.release	= hfsplus_file_release,
	.unlocked_ioctl = hfsplus_ioctl,
};

struct inode *hfsplus_new_inode(struct super_block *sb, int mode)
{
	struct inode *inode = new_inode(sb);
	if (!inode)
		return NULL;

	inode->i_ino = HFSPLUS_SB(sb).next_cnid++;
	inode->i_mode = mode;
	inode->i_uid = current_fsuid();
	inode->i_gid = current_fsgid();
	inode->i_nlink = 1;
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
	INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
	mutex_init(&HFSPLUS_I(inode).extents_lock);
	atomic_set(&HFSPLUS_I(inode).opencnt, 0);
	HFSPLUS_I(inode).flags = 0;
	memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec));
	memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
	HFSPLUS_I(inode).alloc_blocks = 0;
	HFSPLUS_I(inode).first_blocks = 0;
	HFSPLUS_I(inode).cached_start = 0;
	HFSPLUS_I(inode).cached_blocks = 0;
	HFSPLUS_I(inode).phys_size = 0;
	HFSPLUS_I(inode).fs_blocks = 0;
	HFSPLUS_I(inode).rsrc_inode = NULL;
	if (S_ISDIR(inode->i_mode)) {
		inode->i_size = 2;
		HFSPLUS_SB(sb).folder_count++;
		inode->i_op = &hfsplus_dir_inode_operations;
		inode->i_fop = &hfsplus_dir_operations;
	} else if (S_ISREG(inode->i_mode)) {
		HFSPLUS_SB(sb).file_count++;
		inode->i_op = &hfsplus_file_inode_operations;
		inode->i_fop = &hfsplus_file_operations;
		inode->i_mapping->a_ops = &hfsplus_aops;
		HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks;
	} else if (S_ISLNK(inode->i_mode)) {
		HFSPLUS_SB(sb).file_count++;
		inode->i_op = &page_symlink_inode_operations;
		inode->i_mapping->a_ops = &hfsplus_aops;
		HFSPLUS_I(inode).clump_blocks = 1;
	} else
		HFSPLUS_SB(sb).file_count++;
	insert_inode_hash(inode);
	mark_inode_dirty(inode);
	sb->s_dirt = 1;

	return inode;
}

void hfsplus_delete_inode(struct inode *inode)
{
	struct super_block *sb = inode->i_sb;

	if (S_ISDIR(inode->i_mode)) {
		HFSPLUS_SB(sb).folder_count--;
		sb->s_dirt = 1;
		return;
	}
	HFSPLUS_SB(sb).file_count--;
	if (S_ISREG(inode->i_mode)) {
		if (!inode->i_nlink) {
			inode->i_size = 0;
			hfsplus_file_truncate(inode);
		}
	} else if (S_ISLNK(inode->i_mode)) {
		inode->i_size = 0;
		hfsplus_file_truncate(inode);
	}
	sb->s_dirt = 1;
}

void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
{
	struct super_block *sb = inode->i_sb;
	u32 count;
	int i;

	memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents,
	       sizeof(hfsplus_extent_rec));
	for (count = 0, i = 0; i < 8; i++)
		count += be32_to_cpu(fork->extents[i].block_count);
	HFSPLUS_I(inode).first_blocks = count;
	memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
	HFSPLUS_I(inode).cached_start = 0;
	HFSPLUS_I(inode).cached_blocks = 0;

	HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks);
	inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size);
	HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
	inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits);
	HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift;
	if (!HFSPLUS_I(inode).clump_blocks)
		HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks :
				HFSPLUS_SB(sb).data_clump_blocks;
}

void hfsplus_inode_write_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
{
	memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents,
	       sizeof(hfsplus_extent_rec));
	fork->total_size = cpu_to_be64(inode->i_size);
	fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks);
}

int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
{
	hfsplus_cat_entry entry;
	int res = 0;
	u16 type;

	type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset);

	HFSPLUS_I(inode).dev = 0;
	if (type == HFSPLUS_FOLDER) {
		struct hfsplus_cat_folder *folder = &entry.folder;

		if (fd->entrylength < sizeof(struct hfsplus_cat_folder))
			/* panic? */;
		hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
					sizeof(struct hfsplus_cat_folder));
		hfsplus_get_perms(inode, &folder->permissions, 1);
		inode->i_nlink = 1;
		inode->i_size = 2 + be32_to_cpu(folder->valence);
		inode->i_atime = hfsp_mt2ut(folder->access_date);
		inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
		inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date);
		HFSPLUS_I(inode).create_date = folder->create_date;
		HFSPLUS_I(inode).fs_blocks = 0;
		inode->i_op = &hfsplus_dir_inode_operations;
		inode->i_fop = &hfsplus_dir_operations;
	} else if (type == HFSPLUS_FILE) {
		struct hfsplus_cat_file *file = &entry.file;

		if (fd->entrylength < sizeof(struct hfsplus_cat_file))
			/* panic? */;
		hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
					sizeof(struct hfsplus_cat_file));

		hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ?
					&file->data_fork : &file->rsrc_fork);
		hfsplus_get_perms(inode, &file->permissions, 0);
		inode->i_nlink = 1;
		if (S_ISREG(inode->i_mode)) {
			if (file->permissions.dev)
				inode->i_nlink = be32_to_cpu(file->permissions.dev);
			inode->i_op = &hfsplus_file_inode_operations;
			inode->i_fop = &hfsplus_file_operations;
			inode->i_mapping->a_ops = &hfsplus_aops;
		} else if (S_ISLNK(inode->i_mode)) {
			inode->i_op = &page_symlink_inode_operations;
			inode->i_mapping->a_ops = &hfsplus_aops;
		} else {
			init_special_inode(inode, inode->i_mode,
					   be32_to_cpu(file->permissions.dev));
		}
		inode->i_atime = hfsp_mt2ut(file->access_date);
		inode->i_mtime = hfsp_mt2ut(file->content_mod_date);
		inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date);
		HFSPLUS_I(inode).create_date = file->create_date;
	} else {
		printk(KERN_ERR "hfs: bad catalog entry used to create inode\n");
		res = -EIO;
	}
	return res;
}

int hfsplus_cat_write_inode(struct inode *inode)
{
	struct inode *main_inode = inode;
	struct hfs_find_data fd;
	hfsplus_cat_entry entry;

	if (HFSPLUS_IS_RSRC(inode))
		main_inode = HFSPLUS_I(inode).rsrc_inode;

	if (!main_inode->i_nlink)
		return 0;

	if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb).cat_tree, &fd))
		/* panic? */
		return -EIO;

	if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd))
		/* panic? */
		goto out;

	if (S_ISDIR(main_inode->i_mode)) {
		struct hfsplus_cat_folder *folder = &entry.folder;

		if (fd.entrylength < sizeof(struct hfsplus_cat_folder))
			/* panic? */;
		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
					sizeof(struct hfsplus_cat_folder));
		/* simple node checks? */
		hfsplus_set_perms(inode, &folder->permissions);
		folder->access_date = hfsp_ut2mt(inode->i_atime);
		folder->content_mod_date = hfsp_ut2mt(inode->i_mtime);
		folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
		folder->valence = cpu_to_be32(inode->i_size - 2);
		hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
					 sizeof(struct hfsplus_cat_folder));
	} else if (HFSPLUS_IS_RSRC(inode)) {
		struct hfsplus_cat_file *file = &entry.file;
		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
			       sizeof(struct hfsplus_cat_file));
		hfsplus_inode_write_fork(inode, &file->rsrc_fork);
		hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
				sizeof(struct hfsplus_cat_file));
	} else {
		struct hfsplus_cat_file *file = &entry.file;

		if (fd.entrylength < sizeof(struct hfsplus_cat_file))
			/* panic? */;
		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
					sizeof(struct hfsplus_cat_file));
		hfsplus_inode_write_fork(inode, &file->data_fork);
		if (S_ISREG(inode->i_mode))
			HFSPLUS_I(inode).dev = inode->i_nlink;
		if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
			HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev);
		hfsplus_set_perms(inode, &file->permissions);
		if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE)
			file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
		else
			file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED);
		file->access_date = hfsp_ut2mt(inode->i_atime);
		file->content_mod_date = hfsp_ut2mt(inode->i_mtime);
		file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
		hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
					 sizeof(struct hfsplus_cat_file));
	}
out:
	hfs_find_exit(&fd);
	return 0;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/hfsplus/inode.c
	3	*
	4	* Copyright (C) 2001
	5	* Brad Boyer (flar@allandria.com)
	6	* (C) 2003 Ardis Technologies <roman@ardistech.com>
	7	*
	8	* Inode handling routines
	9	*/
	10
	11	#include <linux/mm.h>
	12	#include <linux/fs.h>
	13	#include <linux/pagemap.h>
1da177e4	14	#include <linux/mpage.h>
e8edc6e0	15	#include <linux/sched.h>
1da177e4 LT	16
	17	#include "hfsplus_fs.h"
	18	#include "hfsplus_raw.h"
	19
	20	static int hfsplus_readpage(struct file file, struct page page)
	21	{
1da177e4 LT	22	return block_read_full_page(page, hfsplus_get_block);
	23	}
	24
	25	static int hfsplus_writepage(struct page page, struct writeback_control wbc)
	26	{
1da177e4 LT	27	return block_write_full_page(page, hfsplus_get_block, wbc);
	28	}
	29
7c0efc62 NP	30	static int hfsplus_write_begin(struct file file, struct address_space mapping,
	31	loff_t pos, unsigned len, unsigned flags,
	32	struct page pagep, void fsdata)
1da177e4	33	{
282dc178 CH	34	int ret;
282dc178 CH	35
7c0efc62	36	*pagep = NULL;
282dc178	37	ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
7c0efc62 NP	38	hfsplus_get_block,
7c0efc62 NP	39	&HFSPLUS_I(mapping->host).phys_size);
282dc178 CH	40	if (unlikely(ret)) {
	41	loff_t isize = mapping->host->i_size;
	42	if (pos + len > isize)
	43	vmtruncate(mapping->host, isize);
	44	}
	45
	46	return ret;
1da177e4 LT	47	}
	48
	49	static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block)
	50	{
	51	return generic_block_bmap(mapping, block, hfsplus_get_block);
	52	}
	53
27496a8c	54	static int hfsplus_releasepage(struct page *page, gfp_t mask)
1da177e4 LT	55	{
	56	struct inode *inode = page->mapping->host;
	57	struct super_block *sb = inode->i_sb;
	58	struct hfs_btree *tree;
	59	struct hfs_bnode *node;
	60	u32 nidx;
	61	int i, res = 1;
	62
	63	switch (inode->i_ino) {
	64	case HFSPLUS_EXT_CNID:
	65	tree = HFSPLUS_SB(sb).ext_tree;
	66	break;
	67	case HFSPLUS_CAT_CNID:
	68	tree = HFSPLUS_SB(sb).cat_tree;
	69	break;
	70	case HFSPLUS_ATTR_CNID:
	71	tree = HFSPLUS_SB(sb).attr_tree;
	72	break;
	73	default:
	74	BUG();
	75	return 0;
	76	}
70632249 ES	77	if (!tree)
70632249 ES	78	return 0;
1da177e4 LT	79	if (tree->node_size >= PAGE_CACHE_SIZE) {
	80	nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT);
	81	spin_lock(&tree->hash_lock);
	82	node = hfs_bnode_findhash(tree, nidx);
	83	if (!node)
	84	;
	85	else if (atomic_read(&node->refcnt))
	86	res = 0;
	87	if (res && node) {
	88	hfs_bnode_unhash(node);
	89	hfs_bnode_free(node);
	90	}
	91	spin_unlock(&tree->hash_lock);
	92	} else {
	93	nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift);
	94	i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift);
	95	spin_lock(&tree->hash_lock);
	96	do {
	97	node = hfs_bnode_findhash(tree, nidx++);
	98	if (!node)
	99	continue;
	100	if (atomic_read(&node->refcnt)) {
	101	res = 0;
	102	break;
	103	}
	104	hfs_bnode_unhash(node);
	105	hfs_bnode_free(node);
	106	} while (--i && nidx < tree->node_count);
	107	spin_unlock(&tree->hash_lock);
	108	}
1da177e4 LT	109	return res ? try_to_free_buffers(page) : 0;
	110	}
	111
1da177e4 LT	112	static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb,
	113	const struct iovec *iov, loff_t offset, unsigned long nr_segs)
	114	{
	115	struct file *file = iocb->ki_filp;
f44ea031	116	struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
eafdc7d1	117	ssize_t ret;
1da177e4	118
eafdc7d1	119	ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
1d8fa7a2	120	offset, nr_segs, hfsplus_get_block, NULL);
eafdc7d1 CH	121
	122	/*
	123	* In case of error extending write may have instantiated a few
	124	* blocks outside i_size. Trim these off again.
	125	*/
	126	if (unlikely((rw & WRITE) && ret < 0)) {
	127	loff_t isize = i_size_read(inode);
	128	loff_t end = offset + iov_length(iov, nr_segs);
	129
	130	if (end > isize)
	131	vmtruncate(inode, isize);
	132	}
	133
	134	return ret;
1da177e4 LT	135	}
	136
	137	static int hfsplus_writepages(struct address_space *mapping,
	138	struct writeback_control *wbc)
	139	{
	140	return mpage_writepages(mapping, wbc, hfsplus_get_block);
	141	}
	142
f5e54d6e	143	const struct address_space_operations hfsplus_btree_aops = {
1da177e4 LT	144	.readpage = hfsplus_readpage,
	145	.writepage = hfsplus_writepage,
	146	.sync_page = block_sync_page,
7c0efc62 NP	147	.write_begin = hfsplus_write_begin,
7c0efc62 NP	148	.write_end = generic_write_end,
1da177e4 LT	149	.bmap = hfsplus_bmap,
	150	.releasepage = hfsplus_releasepage,
	151	};
	152
f5e54d6e	153	const struct address_space_operations hfsplus_aops = {
1da177e4 LT	154	.readpage = hfsplus_readpage,
	155	.writepage = hfsplus_writepage,
	156	.sync_page = block_sync_page,
7c0efc62 NP	157	.write_begin = hfsplus_write_begin,
7c0efc62 NP	158	.write_end = generic_write_end,
1da177e4 LT	159	.bmap = hfsplus_bmap,
	160	.direct_IO = hfsplus_direct_IO,
	161	.writepages = hfsplus_writepages,
	162	};
	163
e16404ed	164	const struct dentry_operations hfsplus_dentry_operations = {
d45bce8f DG	165	.d_hash = hfsplus_hash_dentry,
	166	.d_compare = hfsplus_compare_dentry,
	167	};
	168
1da177e4 LT	169	static struct dentry hfsplus_file_lookup(struct inode dir, struct dentry *dentry,
	170	struct nameidata *nd)
	171	{
	172	struct hfs_find_data fd;
	173	struct super_block *sb = dir->i_sb;
	174	struct inode *inode = NULL;
	175	int err;
	176
	177	if (HFSPLUS_IS_RSRC(dir) \|\| strcmp(dentry->d_name.name, "rsrc"))
	178	goto out;
	179
	180	inode = HFSPLUS_I(dir).rsrc_inode;
	181	if (inode)
	182	goto out;
	183
	184	inode = new_inode(sb);
	185	if (!inode)
	186	return ERR_PTR(-ENOMEM);
	187
	188	inode->i_ino = dir->i_ino;
	189	INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
895c23f8	190	mutex_init(&HFSPLUS_I(inode).extents_lock);
1da177e4 LT	191	HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC;
	192
	193	hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
	194	err = hfsplus_find_cat(sb, dir->i_ino, &fd);
	195	if (!err)
	196	err = hfsplus_cat_read_inode(inode, &fd);
	197	hfs_find_exit(&fd);
	198	if (err) {
	199	iput(inode);
	200	return ERR_PTR(err);
	201	}
	202	HFSPLUS_I(inode).rsrc_inode = dir;
	203	HFSPLUS_I(dir).rsrc_inode = inode;
	204	igrab(dir);
	205	hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes);
	206	mark_inode_dirty(inode);
1da177e4 LT	207	out:
	208	d_add(dentry, inode);
	209	return NULL;
	210	}
	211
	212	static void hfsplus_get_perms(struct inode inode, struct hfsplus_perm perms, int dir)
	213	{
	214	struct super_block *sb = inode->i_sb;
	215	u16 mode;
	216
	217	mode = be16_to_cpu(perms->mode);
	218
	219	inode->i_uid = be32_to_cpu(perms->owner);
	220	if (!inode->i_uid && !mode)
	221	inode->i_uid = HFSPLUS_SB(sb).uid;
	222
	223	inode->i_gid = be32_to_cpu(perms->group);
	224	if (!inode->i_gid && !mode)
	225	inode->i_gid = HFSPLUS_SB(sb).gid;
	226
	227	if (dir) {
	228	mode = mode ? (mode & S_IALLUGO) :
	229	(S_IRWXUGO & ~(HFSPLUS_SB(sb).umask));
	230	mode \|= S_IFDIR;
	231	} else if (!mode)
	232	mode = S_IFREG \| ((S_IRUGO\|S_IWUGO) &
	233	~(HFSPLUS_SB(sb).umask));
	234	inode->i_mode = mode;
	235
	236	HFSPLUS_I(inode).rootflags = perms->rootflags;
	237	HFSPLUS_I(inode).userflags = perms->userflags;
	238	if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE)
	239	inode->i_flags \|= S_IMMUTABLE;
	240	else
	241	inode->i_flags &= ~S_IMMUTABLE;
	242	if (perms->rootflags & HFSPLUS_FLG_APPEND)
	243	inode->i_flags \|= S_APPEND;
	244	else
	245	inode->i_flags &= ~S_APPEND;
	246	}
	247
	248	static void hfsplus_set_perms(struct inode inode, struct hfsplus_perm perms)
	249	{
	250	if (inode->i_flags & S_IMMUTABLE)
	251	perms->rootflags \|= HFSPLUS_FLG_IMMUTABLE;
	252	else
	253	perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
	254	if (inode->i_flags & S_APPEND)
	255	perms->rootflags \|= HFSPLUS_FLG_APPEND;
	256	else
	257	perms->rootflags &= ~HFSPLUS_FLG_APPEND;
	258	perms->userflags = HFSPLUS_I(inode).userflags;
	259	perms->mode = cpu_to_be16(inode->i_mode);
	260	perms->owner = cpu_to_be32(inode->i_uid);
	261	perms->group = cpu_to_be32(inode->i_gid);
	262	perms->dev = cpu_to_be32(HFSPLUS_I(inode).dev);
	263	}
	264
1da177e4 LT	265	static int hfsplus_file_open(struct inode inode, struct file file)
	266	{
	267	if (HFSPLUS_IS_RSRC(inode))
	268	inode = HFSPLUS_I(inode).rsrc_inode;
6e715294 AC	269	if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
6e715294 AC	270	return -EOVERFLOW;
1da177e4 LT	271	atomic_inc(&HFSPLUS_I(inode).opencnt);
	272	return 0;
	273	}
	274
	275	static int hfsplus_file_release(struct inode inode, struct file file)
	276	{
	277	struct super_block *sb = inode->i_sb;
	278
	279	if (HFSPLUS_IS_RSRC(inode))
	280	inode = HFSPLUS_I(inode).rsrc_inode;
1da177e4	281	if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) {
1b1dcc1b	282	mutex_lock(&inode->i_mutex);
1da177e4 LT	283	hfsplus_file_truncate(inode);
	284	if (inode->i_flags & S_DEAD) {
	285	hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
	286	hfsplus_delete_inode(inode);
	287	}
1b1dcc1b	288	mutex_unlock(&inode->i_mutex);
1da177e4 LT	289	}
	290	return 0;
	291	}
	292
92e1d5be	293	static const struct inode_operations hfsplus_file_inode_operations = {
1da177e4 LT	294	.lookup = hfsplus_file_lookup,
1da177e4 LT	295	.truncate = hfsplus_file_truncate,
1da177e4 LT	296	.setxattr = hfsplus_setxattr,
	297	.getxattr = hfsplus_getxattr,
	298	.listxattr = hfsplus_listxattr,
	299	};
	300
4b6f5d20	301	static const struct file_operations hfsplus_file_operations = {
1da177e4	302	.llseek = generic_file_llseek,
543ade1f BP	303	.read = do_sync_read,
	304	.aio_read = generic_file_aio_read,
	305	.write = do_sync_write,
	306	.aio_write = generic_file_aio_write,
1da177e4	307	.mmap = generic_file_mmap,
5ffc4ef4	308	.splice_read = generic_file_splice_read,
1da177e4 LT	309	.fsync = file_fsync,
	310	.open = hfsplus_file_open,
	311	.release = hfsplus_file_release,
7cc4bcc6	312	.unlocked_ioctl = hfsplus_ioctl,
1da177e4 LT	313	};
	314
	315	struct inode hfsplus_new_inode(struct super_block sb, int mode)
	316	{
	317	struct inode *inode = new_inode(sb);
	318	if (!inode)
	319	return NULL;
	320
1da177e4 LT	321	inode->i_ino = HFSPLUS_SB(sb).next_cnid++;
1da177e4 LT	322	inode->i_mode = mode;
4ac8489a DH	323	inode->i_uid = current_fsuid();
4ac8489a DH	324	inode->i_gid = current_fsgid();
1da177e4 LT	325	inode->i_nlink = 1;
1da177e4 LT	326	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
1da177e4	327	INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
895c23f8	328	mutex_init(&HFSPLUS_I(inode).extents_lock);
1da177e4 LT	329	atomic_set(&HFSPLUS_I(inode).opencnt, 0);
	330	HFSPLUS_I(inode).flags = 0;
	331	memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec));
	332	memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
	333	HFSPLUS_I(inode).alloc_blocks = 0;
	334	HFSPLUS_I(inode).first_blocks = 0;
	335	HFSPLUS_I(inode).cached_start = 0;
	336	HFSPLUS_I(inode).cached_blocks = 0;
	337	HFSPLUS_I(inode).phys_size = 0;
	338	HFSPLUS_I(inode).fs_blocks = 0;
	339	HFSPLUS_I(inode).rsrc_inode = NULL;
	340	if (S_ISDIR(inode->i_mode)) {
	341	inode->i_size = 2;
	342	HFSPLUS_SB(sb).folder_count++;
	343	inode->i_op = &hfsplus_dir_inode_operations;
	344	inode->i_fop = &hfsplus_dir_operations;
	345	} else if (S_ISREG(inode->i_mode)) {
	346	HFSPLUS_SB(sb).file_count++;
	347	inode->i_op = &hfsplus_file_inode_operations;
	348	inode->i_fop = &hfsplus_file_operations;
	349	inode->i_mapping->a_ops = &hfsplus_aops;
	350	HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks;
	351	} else if (S_ISLNK(inode->i_mode)) {
	352	HFSPLUS_SB(sb).file_count++;
	353	inode->i_op = &page_symlink_inode_operations;
	354	inode->i_mapping->a_ops = &hfsplus_aops;
	355	HFSPLUS_I(inode).clump_blocks = 1;
	356	} else
	357	HFSPLUS_SB(sb).file_count++;
	358	insert_inode_hash(inode);
	359	mark_inode_dirty(inode);
	360	sb->s_dirt = 1;
	361
	362	return inode;
	363	}
	364
	365	void hfsplus_delete_inode(struct inode *inode)
	366	{
	367	struct super_block *sb = inode->i_sb;
	368
	369	if (S_ISDIR(inode->i_mode)) {
	370	HFSPLUS_SB(sb).folder_count--;
	371	sb->s_dirt = 1;
	372	return;
	373	}
	374	HFSPLUS_SB(sb).file_count--;
	375	if (S_ISREG(inode->i_mode)) {
	376	if (!inode->i_nlink) {
	377	inode->i_size = 0;
	378	hfsplus_file_truncate(inode);
	379	}
	380	} else if (S_ISLNK(inode->i_mode)) {
	381	inode->i_size = 0;
	382	hfsplus_file_truncate(inode);
	383	}
	384	sb->s_dirt = 1;
	385	}
	386
	387	void hfsplus_inode_read_fork(struct inode inode, struct hfsplus_fork_raw fork)
	388	{
	389	struct super_block *sb = inode->i_sb;
	390	u32 count;
	391	int i;
	392
393	memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents,
394	sizeof(hfsplus_extent_rec));
395	for (count = 0, i = 0; i < 8; i++)
396	count += be32_to_cpu(fork->extents[i].block_count);
397	HFSPLUS_I(inode).first_blocks = count;
398	memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
399	HFSPLUS_I(inode).cached_start = 0;
400	HFSPLUS_I(inode).cached_blocks = 0;
401
402	HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks);
403	inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size);
404	HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
405	inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits);
406	HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift;
407	if (!HFSPLUS_I(inode).clump_blocks)
408	HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks :
409	HFSPLUS_SB(sb).data_clump_blocks;
410	}
411
412	void hfsplus_inode_write_fork(struct inode inode, struct hfsplus_fork_raw fork)
413	{
414	memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents,
415	sizeof(hfsplus_extent_rec));
416	fork->total_size = cpu_to_be64(inode->i_size);
417	fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks);
418	}
419
420	int hfsplus_cat_read_inode(struct inode inode, struct hfs_find_data fd)
421	{
422	hfsplus_cat_entry entry;
423	int res = 0;
424	u16 type;
425
426	type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset);
427
428	HFSPLUS_I(inode).dev = 0;
1da177e4 LT	429	if (type == HFSPLUS_FOLDER) {
	430	struct hfsplus_cat_folder *folder = &entry.folder;
	431
	432	if (fd->entrylength < sizeof(struct hfsplus_cat_folder))
	433	/* panic? */;
	434	hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
	435	sizeof(struct hfsplus_cat_folder));
	436	hfsplus_get_perms(inode, &folder->permissions, 1);
	437	inode->i_nlink = 1;
	438	inode->i_size = 2 + be32_to_cpu(folder->valence);
	439	inode->i_atime = hfsp_mt2ut(folder->access_date);
	440	inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
9a4cad95 RZ	441	inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date);
9a4cad95 RZ	442	HFSPLUS_I(inode).create_date = folder->create_date;
1da177e4 LT	443	HFSPLUS_I(inode).fs_blocks = 0;
	444	inode->i_op = &hfsplus_dir_inode_operations;
	445	inode->i_fop = &hfsplus_dir_operations;
	446	} else if (type == HFSPLUS_FILE) {
	447	struct hfsplus_cat_file *file = &entry.file;
	448
	449	if (fd->entrylength < sizeof(struct hfsplus_cat_file))
	450	/* panic? */;
	451	hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
	452	sizeof(struct hfsplus_cat_file));
	453
	454	hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ?
	455	&file->data_fork : &file->rsrc_fork);
	456	hfsplus_get_perms(inode, &file->permissions, 0);
	457	inode->i_nlink = 1;
	458	if (S_ISREG(inode->i_mode)) {
	459	if (file->permissions.dev)
	460	inode->i_nlink = be32_to_cpu(file->permissions.dev);
	461	inode->i_op = &hfsplus_file_inode_operations;
	462	inode->i_fop = &hfsplus_file_operations;
	463	inode->i_mapping->a_ops = &hfsplus_aops;
	464	} else if (S_ISLNK(inode->i_mode)) {
	465	inode->i_op = &page_symlink_inode_operations;
	466	inode->i_mapping->a_ops = &hfsplus_aops;
	467	} else {
	468	init_special_inode(inode, inode->i_mode,
	469	be32_to_cpu(file->permissions.dev));
	470	}
	471	inode->i_atime = hfsp_mt2ut(file->access_date);
	472	inode->i_mtime = hfsp_mt2ut(file->content_mod_date);
9a4cad95 RZ	473	inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date);
9a4cad95 RZ	474	HFSPLUS_I(inode).create_date = file->create_date;
1da177e4	475	} else {
634725a9	476	printk(KERN_ERR "hfs: bad catalog entry used to create inode\n");
1da177e4 LT	477	res = -EIO;
	478	}
	479	return res;
	480	}
	481
	482	int hfsplus_cat_write_inode(struct inode *inode)
	483	{
	484	struct inode *main_inode = inode;
	485	struct hfs_find_data fd;
	486	hfsplus_cat_entry entry;
	487
	488	if (HFSPLUS_IS_RSRC(inode))
	489	main_inode = HFSPLUS_I(inode).rsrc_inode;
	490
	491	if (!main_inode->i_nlink)
	492	return 0;
	493
	494	if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb).cat_tree, &fd))
	495	/* panic? */
	496	return -EIO;
	497
	498	if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd))
	499	/* panic? */
	500	goto out;
	501
	502	if (S_ISDIR(main_inode->i_mode)) {
	503	struct hfsplus_cat_folder *folder = &entry.folder;
	504
	505	if (fd.entrylength < sizeof(struct hfsplus_cat_folder))
	506	/* panic? */;
	507	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
	508	sizeof(struct hfsplus_cat_folder));
	509	/* simple node checks? */
	510	hfsplus_set_perms(inode, &folder->permissions);
	511	folder->access_date = hfsp_ut2mt(inode->i_atime);
	512	folder->content_mod_date = hfsp_ut2mt(inode->i_mtime);
	513	folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
	514	folder->valence = cpu_to_be32(inode->i_size - 2);
	515	hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
	516	sizeof(struct hfsplus_cat_folder));
	517	} else if (HFSPLUS_IS_RSRC(inode)) {
	518	struct hfsplus_cat_file *file = &entry.file;
	519	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
	520	sizeof(struct hfsplus_cat_file));
	521	hfsplus_inode_write_fork(inode, &file->rsrc_fork);
	522	hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
	523	sizeof(struct hfsplus_cat_file));
	524	} else {
	525	struct hfsplus_cat_file *file = &entry.file;
	526
	527	if (fd.entrylength < sizeof(struct hfsplus_cat_file))
	528	/* panic? */;
	529	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
	530	sizeof(struct hfsplus_cat_file));
	531	hfsplus_inode_write_fork(inode, &file->data_fork);
	532	if (S_ISREG(inode->i_mode))
	533	HFSPLUS_I(inode).dev = inode->i_nlink;
	534	if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode))
	535	HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev);
	536	hfsplus_set_perms(inode, &file->permissions);
	537	if ((file->permissions.rootflags \| file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE)
	538	file->flags \|= cpu_to_be16(HFSPLUS_FILE_LOCKED);
	539	else
	540	file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED);
541	file->access_date = hfsp_ut2mt(inode->i_atime);
542	file->content_mod_date = hfsp_ut2mt(inode->i_mtime);
543	file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
544	hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
545	sizeof(struct hfsplus_cat_file));
546	}
547	out:
548	hfs_find_exit(&fd);
549	return 0;
550	}