[deliverable/linux.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)
{
	*pagep = NULL;
	return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
				hfsplus_get_block,
				&HFSPLUS_I(mapping->host).phys_size);
}

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