fs/hfsplus/inode.c - kernel/msm-4.9 - Gitiles

 /*
  *  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;
 	struct hfsplus_inode_info *hip;
 	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);

 	hip = HFSPLUS_I(inode);
 	inode->i_ino = dir->i_ino;
 	INIT_LIST_HEAD(&hip->open_dir_list);
 	mutex_init(&hip->extents_lock);
 	hip->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);
 	}
 	hip->rsrc_inode = dir;
 	HFSPLUS_I(dir)->rsrc_inode = inode;
 	igrab(dir);

 	/*
 	 * __mark_inode_dirty expects inodes to be hashed.  Since we don't
 	 * want resource fork inodes in the regular inode space, we make them
 	 * appear hashed, but do not put on any lists.  hlist_del()
 	 * will work fine and require no locking.
 	 */
 	inode->i_hash.pprev = &inode->i_hash.next;

 	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 hfsplus_sb_info *sbi = HFSPLUS_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 = sbi->uid;

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

 	if (dir) {
 		mode = mode ? (mode & S_IALLUGO) : (S_IRWXUGO & ~(sbi->umask));
 		mode |= S_IFDIR;
 	} else if (!mode)
 		mode = S_IFREG | ((S_IRUGO|S_IWUGO) & ~(sbi->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 int hfsplus_setattr(struct dentry *dentry, struct iattr *attr)
 {
 	struct inode *inode = dentry->d_inode;
 	int error;

 	error = inode_change_ok(inode, attr);
 	if (error)
 		return error;

 	if ((attr->ia_valid & ATTR_SIZE) &&
 	    attr->ia_size != i_size_read(inode)) {
 		error = vmtruncate(inode, attr->ia_size);
 		if (error)
 			return error;
 	}

 	setattr_copy(inode, attr);
 	mark_inode_dirty(inode);
 	return 0;
 }

 static int hfsplus_file_fsync(struct file *filp, int datasync)
 {
 	struct inode *inode = filp->f_mapping->host;
 	struct super_block * sb;
 	int ret, err;

 	/* sync the inode to buffers */
 	ret = write_inode_now(inode, 0);

 	/* sync the superblock to buffers */
 	sb = inode->i_sb;
 	if (sb->s_dirt) {
 		if (!(sb->s_flags & MS_RDONLY))
 			hfsplus_sync_fs(sb, 1);
 		else
 			sb->s_dirt = 0;
 	}

 	/* .. finally sync the buffers to disk */
 	err = sync_blockdev(sb->s_bdev);
 	if (!ret)
 		ret = err;
 	return ret;
 }

 static const struct inode_operations hfsplus_file_inode_operations = {
 	.lookup		= hfsplus_file_lookup,
 	.truncate	= hfsplus_file_truncate,
 	.setattr	= hfsplus_setattr,
 	.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		= hfsplus_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 hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 	struct inode *inode = new_inode(sb);
 	struct hfsplus_inode_info *hip;

 	if (!inode)
 		return NULL;

 	inode->i_ino = sbi->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;

 	hip = HFSPLUS_I(inode);
 	INIT_LIST_HEAD(&hip->open_dir_list);
 	mutex_init(&hip->extents_lock);
 	atomic_set(&hip->opencnt, 0);
 	hip->flags = 0;
 	memset(hip->first_extents, 0, sizeof(hfsplus_extent_rec));
 	memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
 	hip->alloc_blocks = 0;
 	hip->first_blocks = 0;
 	hip->cached_start = 0;
 	hip->cached_blocks = 0;
 	hip->phys_size = 0;
 	hip->fs_blocks = 0;
 	hip->rsrc_inode = NULL;
 	if (S_ISDIR(inode->i_mode)) {
 		inode->i_size = 2;
 		sbi->folder_count++;
 		inode->i_op = &hfsplus_dir_inode_operations;
 		inode->i_fop = &hfsplus_dir_operations;
 	} else if (S_ISREG(inode->i_mode)) {
 		sbi->file_count++;
 		inode->i_op = &hfsplus_file_inode_operations;
 		inode->i_fop = &hfsplus_file_operations;
 		inode->i_mapping->a_ops = &hfsplus_aops;
 		hip->clump_blocks = sbi->data_clump_blocks;
 	} else if (S_ISLNK(inode->i_mode)) {
 		sbi->file_count++;
 		inode->i_op = &page_symlink_inode_operations;
 		inode->i_mapping->a_ops = &hfsplus_aops;
 		hip->clump_blocks = 1;
 	} else
 		sbi->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;
 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
 	u32 count;
 	int i;

 	memcpy(&hip->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);
 	hip->first_blocks = count;
 	memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
 	hip->cached_start = 0;
 	hip->cached_blocks = 0;

 	hip->alloc_blocks = be32_to_cpu(fork->total_blocks);
 	hip->phys_size = inode->i_size = be64_to_cpu(fork->total_size);
 	hip->fs_blocks =
 		(inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
 	inode_set_bytes(inode, hip->fs_blocks << sb->s_blocksize_bits);
 	hip->clump_blocks =
 		be32_to_cpu(fork->clump_size) >> sbi->alloc_blksz_shift;
 	if (!hip->clump_blocks) {
 		hip->clump_blocks = HFSPLUS_IS_RSRC(inode) ?
 			sbi->rsrc_clump_blocks :
 			sbi->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;
 }
	/*
	* 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;
	struct hfsplus_inode_info *hip;
	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);

	hip = HFSPLUS_I(inode);
	inode->i_ino = dir->i_ino;
	INIT_LIST_HEAD(&hip->open_dir_list);
	mutex_init(&hip->extents_lock);
	hip->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);
	}
	hip->rsrc_inode = dir;
	HFSPLUS_I(dir)->rsrc_inode = inode;
	igrab(dir);

	/*
	* __mark_inode_dirty expects inodes to be hashed. Since we don't
	* want resource fork inodes in the regular inode space, we make them
	* appear hashed, but do not put on any lists. hlist_del()
	* will work fine and require no locking.
	*/
	inode->i_hash.pprev = &inode->i_hash.next;

	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 hfsplus_sb_info *sbi = HFSPLUS_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 = sbi->uid;

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

	if (dir) {
	mode = mode ? (mode & S_IALLUGO) : (S_IRWXUGO & ~(sbi->umask));
	mode \|= S_IFDIR;
	} else if (!mode)
	mode = S_IFREG \| ((S_IRUGO\|S_IWUGO) & ~(sbi->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 int hfsplus_setattr(struct dentry dentry, struct iattr attr)
	{
	struct inode *inode = dentry->d_inode;
	int error;

	error = inode_change_ok(inode, attr);
	if (error)
	return error;

	if ((attr->ia_valid & ATTR_SIZE) &&
	attr->ia_size != i_size_read(inode)) {
	error = vmtruncate(inode, attr->ia_size);
	if (error)
	return error;
	}

	setattr_copy(inode, attr);
	mark_inode_dirty(inode);
	return 0;
	}

	static int hfsplus_file_fsync(struct file *filp, int datasync)
	{
	struct inode *inode = filp->f_mapping->host;
	struct super_block * sb;
	int ret, err;

	/* sync the inode to buffers */
	ret = write_inode_now(inode, 0);

	/* sync the superblock to buffers */
	sb = inode->i_sb;
	if (sb->s_dirt) {
	if (!(sb->s_flags & MS_RDONLY))
	hfsplus_sync_fs(sb, 1);
	else
	sb->s_dirt = 0;
	}

	/* .. finally sync the buffers to disk */
	err = sync_blockdev(sb->s_bdev);
	if (!ret)
	ret = err;
	return ret;
	}

	static const struct inode_operations hfsplus_file_inode_operations = {
	.lookup = hfsplus_file_lookup,
	.truncate = hfsplus_file_truncate,
	.setattr = hfsplus_setattr,
	.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 = hfsplus_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 hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
	struct inode *inode = new_inode(sb);
	struct hfsplus_inode_info *hip;

	if (!inode)
	return NULL;

	inode->i_ino = sbi->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;

	hip = HFSPLUS_I(inode);
	INIT_LIST_HEAD(&hip->open_dir_list);
	mutex_init(&hip->extents_lock);
	atomic_set(&hip->opencnt, 0);
	hip->flags = 0;
	memset(hip->first_extents, 0, sizeof(hfsplus_extent_rec));
	memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
	hip->alloc_blocks = 0;
	hip->first_blocks = 0;
	hip->cached_start = 0;
	hip->cached_blocks = 0;
	hip->phys_size = 0;
	hip->fs_blocks = 0;
	hip->rsrc_inode = NULL;
	if (S_ISDIR(inode->i_mode)) {
	inode->i_size = 2;
	sbi->folder_count++;
	inode->i_op = &hfsplus_dir_inode_operations;
	inode->i_fop = &hfsplus_dir_operations;
	} else if (S_ISREG(inode->i_mode)) {
	sbi->file_count++;
	inode->i_op = &hfsplus_file_inode_operations;
	inode->i_fop = &hfsplus_file_operations;
	inode->i_mapping->a_ops = &hfsplus_aops;
	hip->clump_blocks = sbi->data_clump_blocks;
	} else if (S_ISLNK(inode->i_mode)) {
	sbi->file_count++;
	inode->i_op = &page_symlink_inode_operations;
	inode->i_mapping->a_ops = &hfsplus_aops;
	hip->clump_blocks = 1;
	} else
	sbi->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;
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
	u32 count;
	int i;

	memcpy(&hip->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);
	hip->first_blocks = count;
	memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
	hip->cached_start = 0;
	hip->cached_blocks = 0;

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