1 files changed, 607 insertions, 0 deletions

diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
new file mode 100644
index 000000000..d7ab9d8c4
--- /dev/null
+++ b/fs/hfsplus/inode.c
@@ -0,0 +1,607 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  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/blkdev.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+#include <linux/mpage.h>
+#include <linux/sched.h>
+#include <linux/cred.h>
+#include <linux/uio.h>
+
+#include "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+#include "xattr.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 void hfsplus_write_failed(struct address_space *mapping, loff_t to)
+{
+	struct inode *inode = mapping->host;
+
+	if (to > inode->i_size) {
+		truncate_pagecache(inode, inode->i_size);
+		hfsplus_file_truncate(inode);
+	}
+}
+
+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))
+		hfsplus_write_failed(mapping, pos + len);
+
+	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_SIZE) {
+		nidx = page->index >>
+			(tree->node_size_shift - PAGE_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_SHIFT - tree->node_size_shift);
+		i = 1 << (PAGE_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(struct kiocb *iocb, struct iov_iter *iter)
+{
+	struct file *file = iocb->ki_filp;
+	struct address_space *mapping = file->f_mapping;
+	struct inode *inode = mapping->host;
+	size_t count = iov_iter_count(iter);
+	ssize_t ret;
+
+	ret = blockdev_direct_IO(iocb, inode, iter, hfsplus_get_block);
+
+	/*
+	 * In case of error extending write may have instantiated a few
+	 * blocks outside i_size. Trim these off again.
+	 */
+	if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
+		loff_t isize = i_size_read(inode);
+		loff_t end = iocb->ki_pos + count;
+
+		if (end > isize)
+			hfsplus_write_failed(mapping, end);
+	}
+
+	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,
+	.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,
+	.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 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);
+
+	i_uid_write(inode, be32_to_cpu(perms->owner));
+	if (!i_uid_read(inode) && !mode)
+		inode->i_uid = sbi->uid;
+
+	i_gid_write(inode, be32_to_cpu(perms->group));
+	if (!i_gid_read(inode) && !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)->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 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)) {
+		inode_lock(inode);
+		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);
+		}
+		inode_unlock(inode);
+	}
+	return 0;
+}
+
+static int hfsplus_setattr(struct dentry *dentry, struct iattr *attr)
+{
+	struct inode *inode = d_inode(dentry);
+	int error;
+
+	error = setattr_prepare(dentry, attr);
+	if (error)
+		return error;
+
+	if ((attr->ia_valid & ATTR_SIZE) &&
+	    attr->ia_size != i_size_read(inode)) {
+		inode_dio_wait(inode);
+		if (attr->ia_size > inode->i_size) {
+			error = generic_cont_expand_simple(inode,
+							   attr->ia_size);
+			if (error)
+				return error;
+		}
+		truncate_setsize(inode, attr->ia_size);
+		hfsplus_file_truncate(inode);
+		inode->i_mtime = inode->i_ctime = current_time(inode);
+	}
+
+	setattr_copy(inode, attr);
+	mark_inode_dirty(inode);
+
+	return 0;
+}
+
+int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end,
+		       int datasync)
+{
+	struct inode *inode = file->f_mapping->host;
+	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
+	struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
+	int error = 0, error2;
+
+	error = file_write_and_wait_range(file, start, end);
+	if (error)
+		return error;
+	inode_lock(inode);
+
+	/*
+	 * Sync inode metadata into the catalog and extent trees.
+	 */
+	sync_inode_metadata(inode, 1);
+
+	/*
+	 * And explicitly write out the btrees.
+	 */
+	if (test_and_clear_bit(HFSPLUS_I_CAT_DIRTY, &hip->flags))
+		error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
+
+	if (test_and_clear_bit(HFSPLUS_I_EXT_DIRTY, &hip->flags)) {
+		error2 =
+			filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
+		if (!error)
+			error = error2;
+	}
+
+	if (test_and_clear_bit(HFSPLUS_I_ATTR_DIRTY, &hip->flags)) {
+		if (sbi->attr_tree) {
+			error2 =
+				filemap_write_and_wait(
+					    sbi->attr_tree->inode->i_mapping);
+			if (!error)
+				error = error2;
+		} else {
+			pr_err("sync non-existent attributes tree\n");
+		}
+	}
+
+	if (test_and_clear_bit(HFSPLUS_I_ALLOC_DIRTY, &hip->flags)) {
+		error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
+		if (!error)
+			error = error2;
+	}
+
+	if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
+		blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
+
+	inode_unlock(inode);
+
+	return error;
+}
+
+static const struct inode_operations hfsplus_file_inode_operations = {
+	.setattr	= hfsplus_setattr,
+	.listxattr	= hfsplus_listxattr,
+};
+
+static const struct file_operations hfsplus_file_operations = {
+	.llseek		= generic_file_llseek,
+	.read_iter	= generic_file_read_iter,
+	.write_iter	= generic_file_write_iter,
+	.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, struct inode *dir,
+				umode_t 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_init_owner(inode, dir, mode);
+	set_nlink(inode, 1);
+	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
+
+	hip = HFSPLUS_I(inode);
+	INIT_LIST_HEAD(&hip->open_dir_list);
+	spin_lock_init(&hip->open_dir_lock);
+	mutex_init(&hip->extents_lock);
+	atomic_set(&hip->opencnt, 0);
+	hip->extent_state = 0;
+	hip->flags = 0;
+	hip->userflags = 0;
+	hip->subfolders = 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_nohighmem(inode);
+		inode->i_mapping->a_ops = &hfsplus_aops;
+		hip->clump_blocks = 1;
+	} else
+		sbi->file_count++;
+	insert_inode_hash(inode);
+	mark_inode_dirty(inode);
+	hfsplus_mark_mdb_dirty(sb);
+
+	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--;
+		hfsplus_mark_mdb_dirty(sb);
+		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);
+	}
+	hfsplus_mark_mdb_dirty(sb);
+}
+
+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)->linkid = 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);
+		set_nlink(inode, 1);
+		inode->i_size = 2 + be32_to_cpu(folder->valence);
+		inode->i_atime = timespec_to_timespec64(hfsp_mt2ut(folder->access_date));
+		inode->i_mtime = timespec_to_timespec64(hfsp_mt2ut(folder->content_mod_date));
+		inode->i_ctime = timespec_to_timespec64(hfsp_mt2ut(folder->attribute_mod_date));
+		HFSPLUS_I(inode)->create_date = folder->create_date;
+		HFSPLUS_I(inode)->fs_blocks = 0;
+		if (folder->flags & cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT)) {
+			HFSPLUS_I(inode)->subfolders =
+				be32_to_cpu(folder->subfolders);
+		}
+		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_RSRC(inode) ?
+					&file->rsrc_fork : &file->data_fork);
+		hfsplus_get_perms(inode, &file->permissions, 0);
+		set_nlink(inode, 1);
+		if (S_ISREG(inode->i_mode)) {
+			if (file->permissions.dev)
+				set_nlink(inode,
+					  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_nohighmem(inode);
+			inode->i_mapping->a_ops = &hfsplus_aops;
+		} else {
+			init_special_inode(inode, inode->i_mode,
+					   be32_to_cpu(file->permissions.dev));
+		}
+		inode->i_atime = timespec_to_timespec64(hfsp_mt2ut(file->access_date));
+		inode->i_mtime = timespec_to_timespec64(hfsp_mt2ut(file->content_mod_date));
+		inode->i_ctime = timespec_to_timespec64(hfsp_mt2ut(file->attribute_mod_date));
+		HFSPLUS_I(inode)->create_date = file->create_date;
+	} else {
+		pr_err("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_cat_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);
+		if (folder->flags & cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT)) {
+			folder->subfolders =
+				cpu_to_be32(HFSPLUS_I(inode)->subfolders);
+		}
+		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);
+		hfsplus_cat_set_perms(inode, &file->permissions);
+		if (HFSPLUS_FLG_IMMUTABLE &
+				(file->permissions.rootflags |
+					file->permissions.userflags))
+			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));
+	}
+
+	set_bit(HFSPLUS_I_CAT_DIRTY, &HFSPLUS_I(inode)->flags);
+out:
+	hfs_find_exit(&fd);
+	return 0;
+}