[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)
{
	*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;

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

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,
};

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_permission(struct inode *inode, int mask)
{
	/* MAY_EXEC is also used for lookup, if no x bit is set allow lookup,
	 * open_exec has the same test, so it's still not executable, if a x bit
	 * is set fall back to standard permission check.
	 */
	if (S_ISREG(inode->i_mode) && mask & MAY_EXEC && !(inode->i_mode & 0111))
		return 0;
	return generic_permission(inode, mask, NULL);
}


static int hfsplus_file_open(struct inode *inode, struct file *file)
{
	if (HFSPLUS_IS_RSRC(inode))
		inode = HFSPLUS_I(inode).rsrc_inode;
	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,
	.permission	= hfsplus_permission,
	.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,
	.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;
1da177e4 LT	108
1da177e4 LT	109	return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
1d8fa7a2	110	offset, nr_segs, hfsplus_get_block, NULL);
1da177e4 LT	111	}
	112
	113	static int hfsplus_writepages(struct address_space *mapping,
	114	struct writeback_control *wbc)
	115	{
	116	return mpage_writepages(mapping, wbc, hfsplus_get_block);
	117	}
	118
f5e54d6e	119	const struct address_space_operations hfsplus_btree_aops = {
1da177e4 LT	120	.readpage = hfsplus_readpage,
	121	.writepage = hfsplus_writepage,
	122	.sync_page = block_sync_page,
7c0efc62 NP	123	.write_begin = hfsplus_write_begin,
7c0efc62 NP	124	.write_end = generic_write_end,
1da177e4 LT	125	.bmap = hfsplus_bmap,
	126	.releasepage = hfsplus_releasepage,
	127	};
	128
f5e54d6e	129	const struct address_space_operations hfsplus_aops = {
1da177e4 LT	130	.readpage = hfsplus_readpage,
	131	.writepage = hfsplus_writepage,
	132	.sync_page = block_sync_page,
7c0efc62 NP	133	.write_begin = hfsplus_write_begin,
7c0efc62 NP	134	.write_end = generic_write_end,
1da177e4 LT	135	.bmap = hfsplus_bmap,
	136	.direct_IO = hfsplus_direct_IO,
	137	.writepages = hfsplus_writepages,
	138	};
	139
d45bce8f DG	140	struct dentry_operations hfsplus_dentry_operations = {
	141	.d_hash = hfsplus_hash_dentry,
	142	.d_compare = hfsplus_compare_dentry,
	143	};
	144
1da177e4 LT	145	static struct dentry hfsplus_file_lookup(struct inode dir, struct dentry *dentry,
	146	struct nameidata *nd)
	147	{
	148	struct hfs_find_data fd;
	149	struct super_block *sb = dir->i_sb;
	150	struct inode *inode = NULL;
	151	int err;
	152
	153	if (HFSPLUS_IS_RSRC(dir) \|\| strcmp(dentry->d_name.name, "rsrc"))
	154	goto out;
	155
	156	inode = HFSPLUS_I(dir).rsrc_inode;
	157	if (inode)
	158	goto out;
	159
	160	inode = new_inode(sb);
	161	if (!inode)
	162	return ERR_PTR(-ENOMEM);
	163
	164	inode->i_ino = dir->i_ino;
	165	INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
895c23f8	166	mutex_init(&HFSPLUS_I(inode).extents_lock);
1da177e4 LT	167	HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC;
	168
	169	hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
	170	err = hfsplus_find_cat(sb, dir->i_ino, &fd);
	171	if (!err)
	172	err = hfsplus_cat_read_inode(inode, &fd);
	173	hfs_find_exit(&fd);
	174	if (err) {
	175	iput(inode);
	176	return ERR_PTR(err);
	177	}
	178	HFSPLUS_I(inode).rsrc_inode = dir;
	179	HFSPLUS_I(dir).rsrc_inode = inode;
	180	igrab(dir);
	181	hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes);
	182	mark_inode_dirty(inode);
1da177e4 LT	183	out:
	184	d_add(dentry, inode);
	185	return NULL;
	186	}
	187
	188	static void hfsplus_get_perms(struct inode inode, struct hfsplus_perm perms, int dir)
	189	{
	190	struct super_block *sb = inode->i_sb;
	191	u16 mode;
	192
	193	mode = be16_to_cpu(perms->mode);
	194
	195	inode->i_uid = be32_to_cpu(perms->owner);
	196	if (!inode->i_uid && !mode)
	197	inode->i_uid = HFSPLUS_SB(sb).uid;
	198
	199	inode->i_gid = be32_to_cpu(perms->group);
	200	if (!inode->i_gid && !mode)
	201	inode->i_gid = HFSPLUS_SB(sb).gid;
	202
	203	if (dir) {
	204	mode = mode ? (mode & S_IALLUGO) :
	205	(S_IRWXUGO & ~(HFSPLUS_SB(sb).umask));
	206	mode \|= S_IFDIR;
	207	} else if (!mode)
	208	mode = S_IFREG \| ((S_IRUGO\|S_IWUGO) &
	209	~(HFSPLUS_SB(sb).umask));
	210	inode->i_mode = mode;
	211
	212	HFSPLUS_I(inode).rootflags = perms->rootflags;
	213	HFSPLUS_I(inode).userflags = perms->userflags;
	214	if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE)
	215	inode->i_flags \|= S_IMMUTABLE;
	216	else
	217	inode->i_flags &= ~S_IMMUTABLE;
	218	if (perms->rootflags & HFSPLUS_FLG_APPEND)
	219	inode->i_flags \|= S_APPEND;
	220	else
	221	inode->i_flags &= ~S_APPEND;
	222	}
	223
	224	static void hfsplus_set_perms(struct inode inode, struct hfsplus_perm perms)
	225	{
	226	if (inode->i_flags & S_IMMUTABLE)
	227	perms->rootflags \|= HFSPLUS_FLG_IMMUTABLE;
	228	else
	229	perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
	230	if (inode->i_flags & S_APPEND)
	231	perms->rootflags \|= HFSPLUS_FLG_APPEND;
	232	else
	233	perms->rootflags &= ~HFSPLUS_FLG_APPEND;
	234	perms->userflags = HFSPLUS_I(inode).userflags;
	235	perms->mode = cpu_to_be16(inode->i_mode);
	236	perms->owner = cpu_to_be32(inode->i_uid);
	237	perms->group = cpu_to_be32(inode->i_gid);
	238	perms->dev = cpu_to_be32(HFSPLUS_I(inode).dev);
	239	}
	240
e6305c43	241	static int hfsplus_permission(struct inode *inode, int mask)
1da177e4 LT	242	{
	243	/* MAY_EXEC is also used for lookup, if no x bit is set allow lookup,
	244	* open_exec has the same test, so it's still not executable, if a x bit
	245	* is set fall back to standard permission check.
	246	*/
	247	if (S_ISREG(inode->i_mode) && mask & MAY_EXEC && !(inode->i_mode & 0111))
	248	return 0;
	249	return generic_permission(inode, mask, NULL);
	250	}
	251
	252
	253	static int hfsplus_file_open(struct inode inode, struct file file)
	254	{
	255	if (HFSPLUS_IS_RSRC(inode))
	256	inode = HFSPLUS_I(inode).rsrc_inode;
1da177e4 LT	257	atomic_inc(&HFSPLUS_I(inode).opencnt);
	258	return 0;
	259	}
	260
	261	static int hfsplus_file_release(struct inode inode, struct file file)
	262	{
	263	struct super_block *sb = inode->i_sb;
	264
	265	if (HFSPLUS_IS_RSRC(inode))
	266	inode = HFSPLUS_I(inode).rsrc_inode;
1da177e4	267	if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) {
1b1dcc1b	268	mutex_lock(&inode->i_mutex);
1da177e4 LT	269	hfsplus_file_truncate(inode);
	270	if (inode->i_flags & S_DEAD) {
	271	hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
	272	hfsplus_delete_inode(inode);
	273	}
1b1dcc1b	274	mutex_unlock(&inode->i_mutex);
1da177e4 LT	275	}
	276	return 0;
	277	}
	278
92e1d5be	279	static const struct inode_operations hfsplus_file_inode_operations = {
1da177e4 LT	280	.lookup = hfsplus_file_lookup,
	281	.truncate = hfsplus_file_truncate,
	282	.permission = hfsplus_permission,
	283	.setxattr = hfsplus_setxattr,
	284	.getxattr = hfsplus_getxattr,
	285	.listxattr = hfsplus_listxattr,
	286	};
	287
4b6f5d20	288	static const struct file_operations hfsplus_file_operations = {
1da177e4	289	.llseek = generic_file_llseek,
543ade1f BP	290	.read = do_sync_read,
	291	.aio_read = generic_file_aio_read,
	292	.write = do_sync_write,
	293	.aio_write = generic_file_aio_write,
1da177e4	294	.mmap = generic_file_mmap,
5ffc4ef4	295	.splice_read = generic_file_splice_read,
1da177e4 LT	296	.fsync = file_fsync,
	297	.open = hfsplus_file_open,
	298	.release = hfsplus_file_release,
	299	.ioctl = hfsplus_ioctl,
	300	};
	301
	302	struct inode hfsplus_new_inode(struct super_block sb, int mode)
	303	{
	304	struct inode *inode = new_inode(sb);
	305	if (!inode)
	306	return NULL;
	307
1da177e4 LT	308	inode->i_ino = HFSPLUS_SB(sb).next_cnid++;
	309	inode->i_mode = mode;
	310	inode->i_uid = current->fsuid;
	311	inode->i_gid = current->fsgid;
	312	inode->i_nlink = 1;
	313	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
1da177e4	314	INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
895c23f8	315	mutex_init(&HFSPLUS_I(inode).extents_lock);
1da177e4 LT	316	atomic_set(&HFSPLUS_I(inode).opencnt, 0);
	317	HFSPLUS_I(inode).flags = 0;
	318	memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec));
	319	memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
	320	HFSPLUS_I(inode).alloc_blocks = 0;
	321	HFSPLUS_I(inode).first_blocks = 0;
	322	HFSPLUS_I(inode).cached_start = 0;
	323	HFSPLUS_I(inode).cached_blocks = 0;
	324	HFSPLUS_I(inode).phys_size = 0;
	325	HFSPLUS_I(inode).fs_blocks = 0;
	326	HFSPLUS_I(inode).rsrc_inode = NULL;
	327	if (S_ISDIR(inode->i_mode)) {
	328	inode->i_size = 2;
	329	HFSPLUS_SB(sb).folder_count++;
	330	inode->i_op = &hfsplus_dir_inode_operations;
	331	inode->i_fop = &hfsplus_dir_operations;
	332	} else if (S_ISREG(inode->i_mode)) {
	333	HFSPLUS_SB(sb).file_count++;
	334	inode->i_op = &hfsplus_file_inode_operations;
	335	inode->i_fop = &hfsplus_file_operations;
	336	inode->i_mapping->a_ops = &hfsplus_aops;
	337	HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks;
	338	} else if (S_ISLNK(inode->i_mode)) {
	339	HFSPLUS_SB(sb).file_count++;
	340	inode->i_op = &page_symlink_inode_operations;
	341	inode->i_mapping->a_ops = &hfsplus_aops;
	342	HFSPLUS_I(inode).clump_blocks = 1;
	343	} else
	344	HFSPLUS_SB(sb).file_count++;
	345	insert_inode_hash(inode);
	346	mark_inode_dirty(inode);
	347	sb->s_dirt = 1;
	348
	349	return inode;
	350	}
	351
	352	void hfsplus_delete_inode(struct inode *inode)
	353	{
	354	struct super_block *sb = inode->i_sb;
	355
	356	if (S_ISDIR(inode->i_mode)) {
	357	HFSPLUS_SB(sb).folder_count--;
	358	sb->s_dirt = 1;
	359	return;
	360	}
	361	HFSPLUS_SB(sb).file_count--;
	362	if (S_ISREG(inode->i_mode)) {
	363	if (!inode->i_nlink) {
	364	inode->i_size = 0;
	365	hfsplus_file_truncate(inode);
	366	}
	367	} else if (S_ISLNK(inode->i_mode)) {
	368	inode->i_size = 0;
	369	hfsplus_file_truncate(inode);
	370	}
	371	sb->s_dirt = 1;
	372	}
	373
	374	void hfsplus_inode_read_fork(struct inode inode, struct hfsplus_fork_raw fork)
	375	{
	376	struct super_block *sb = inode->i_sb;
	377	u32 count;
	378	int i;
	379
380	memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents,
381	sizeof(hfsplus_extent_rec));
382	for (count = 0, i = 0; i < 8; i++)
383	count += be32_to_cpu(fork->extents[i].block_count);
384	HFSPLUS_I(inode).first_blocks = count;
385	memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
386	HFSPLUS_I(inode).cached_start = 0;
387	HFSPLUS_I(inode).cached_blocks = 0;
388
389	HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks);
390	inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size);
391	HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
392	inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits);
393	HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift;
394	if (!HFSPLUS_I(inode).clump_blocks)
395	HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks :
396	HFSPLUS_SB(sb).data_clump_blocks;
397	}
398
399	void hfsplus_inode_write_fork(struct inode inode, struct hfsplus_fork_raw fork)
400	{
401	memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents,
402	sizeof(hfsplus_extent_rec));
403	fork->total_size = cpu_to_be64(inode->i_size);
404	fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks);
405	}
406
407	int hfsplus_cat_read_inode(struct inode inode, struct hfs_find_data fd)
408	{
409	hfsplus_cat_entry entry;
410	int res = 0;
411	u16 type;
412
413	type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset);
414
415	HFSPLUS_I(inode).dev = 0;
1da177e4 LT	416	if (type == HFSPLUS_FOLDER) {
	417	struct hfsplus_cat_folder *folder = &entry.folder;
	418
	419	if (fd->entrylength < sizeof(struct hfsplus_cat_folder))
	420	/* panic? */;
	421	hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
	422	sizeof(struct hfsplus_cat_folder));
	423	hfsplus_get_perms(inode, &folder->permissions, 1);
	424	inode->i_nlink = 1;
	425	inode->i_size = 2 + be32_to_cpu(folder->valence);
	426	inode->i_atime = hfsp_mt2ut(folder->access_date);
	427	inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
9a4cad95 RZ	428	inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date);
9a4cad95 RZ	429	HFSPLUS_I(inode).create_date = folder->create_date;
1da177e4 LT	430	HFSPLUS_I(inode).fs_blocks = 0;
	431	inode->i_op = &hfsplus_dir_inode_operations;
	432	inode->i_fop = &hfsplus_dir_operations;
	433	} else if (type == HFSPLUS_FILE) {
	434	struct hfsplus_cat_file *file = &entry.file;
	435
	436	if (fd->entrylength < sizeof(struct hfsplus_cat_file))
	437	/* panic? */;
	438	hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
	439	sizeof(struct hfsplus_cat_file));
	440
	441	hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ?
	442	&file->data_fork : &file->rsrc_fork);
	443	hfsplus_get_perms(inode, &file->permissions, 0);
	444	inode->i_nlink = 1;
	445	if (S_ISREG(inode->i_mode)) {
	446	if (file->permissions.dev)
	447	inode->i_nlink = be32_to_cpu(file->permissions.dev);
	448	inode->i_op = &hfsplus_file_inode_operations;
	449	inode->i_fop = &hfsplus_file_operations;
	450	inode->i_mapping->a_ops = &hfsplus_aops;
	451	} else if (S_ISLNK(inode->i_mode)) {
	452	inode->i_op = &page_symlink_inode_operations;
	453	inode->i_mapping->a_ops = &hfsplus_aops;
	454	} else {
	455	init_special_inode(inode, inode->i_mode,
	456	be32_to_cpu(file->permissions.dev));
	457	}
	458	inode->i_atime = hfsp_mt2ut(file->access_date);
	459	inode->i_mtime = hfsp_mt2ut(file->content_mod_date);
9a4cad95 RZ	460	inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date);
9a4cad95 RZ	461	HFSPLUS_I(inode).create_date = file->create_date;
1da177e4	462	} else {
634725a9	463	printk(KERN_ERR "hfs: bad catalog entry used to create inode\n");
1da177e4 LT	464	res = -EIO;
	465	}
	466	return res;
	467	}
	468
	469	int hfsplus_cat_write_inode(struct inode *inode)
	470	{
	471	struct inode *main_inode = inode;
	472	struct hfs_find_data fd;
	473	hfsplus_cat_entry entry;
	474
	475	if (HFSPLUS_IS_RSRC(inode))
	476	main_inode = HFSPLUS_I(inode).rsrc_inode;
	477
	478	if (!main_inode->i_nlink)
	479	return 0;
	480
	481	if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb).cat_tree, &fd))
	482	/* panic? */
	483	return -EIO;
	484
	485	if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd))
	486	/* panic? */
	487	goto out;
	488
	489	if (S_ISDIR(main_inode->i_mode)) {
	490	struct hfsplus_cat_folder *folder = &entry.folder;
	491
	492	if (fd.entrylength < sizeof(struct hfsplus_cat_folder))
	493	/* panic? */;
	494	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
	495	sizeof(struct hfsplus_cat_folder));
	496	/* simple node checks? */
	497	hfsplus_set_perms(inode, &folder->permissions);
	498	folder->access_date = hfsp_ut2mt(inode->i_atime);
	499	folder->content_mod_date = hfsp_ut2mt(inode->i_mtime);
	500	folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
	501	folder->valence = cpu_to_be32(inode->i_size - 2);
	502	hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
	503	sizeof(struct hfsplus_cat_folder));
	504	} else if (HFSPLUS_IS_RSRC(inode)) {
	505	struct hfsplus_cat_file *file = &entry.file;
	506	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
	507	sizeof(struct hfsplus_cat_file));
	508	hfsplus_inode_write_fork(inode, &file->rsrc_fork);
	509	hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
	510	sizeof(struct hfsplus_cat_file));
	511	} else {
	512	struct hfsplus_cat_file *file = &entry.file;
	513
	514	if (fd.entrylength < sizeof(struct hfsplus_cat_file))
	515	/* panic? */;
	516	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
	517	sizeof(struct hfsplus_cat_file));
	518	hfsplus_inode_write_fork(inode, &file->data_fork);
	519	if (S_ISREG(inode->i_mode))
	520	HFSPLUS_I(inode).dev = inode->i_nlink;
	521	if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode))
	522	HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev);
	523	hfsplus_set_perms(inode, &file->permissions);
	524	if ((file->permissions.rootflags \| file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE)
	525	file->flags \|= cpu_to_be16(HFSPLUS_FILE_LOCKED);
	526	else
	527	file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED);
528	file->access_date = hfsp_ut2mt(inode->i_atime);
529	file->content_mod_date = hfsp_ut2mt(inode->i_mtime);
530	file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
531	hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
532	sizeof(struct hfsplus_cat_file));
533	}
534	out:
535	hfs_find_exit(&fd);
536	return 0;
537	}