patch-2.4.22 linux-2.4.22/fs/hfsplus/inode.c

• Lines: 480
• Date: 2003-08-25 04:44:43.000000000 -0700
• Orig file: linux-2.4.21/fs/hfsplus/inode.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/fs/hfsplus/inode.c linux-2.4.22/fs/hfsplus/inode.c
@@ -0,0 +1,479 @@
+/*
+ *  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/version.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
+#include <linux/buffer_head.h>
+#endif
+
+#include "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+
+static int hfsplus_readpage(struct file *file, struct page *page)
+{
+	//printk("readpage: %lu\n", page->index);
+	return block_read_full_page(page, hfsplus_get_block);
+}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
+static int hfsplus_writepage(struct page *page, struct writeback_control *wbc)
+{
+	//printk("writepage: %lu\n", page->index);
+	return block_write_full_page(page, hfsplus_get_block, wbc);
+}
+#else
+static int hfsplus_writepage(struct page *page)
+{
+	//printk("writepage: %lu\n", page->index);
+	return block_write_full_page(page, hfsplus_get_block);
+}
+#endif
+
+static int hfsplus_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
+{
+	return cont_prepare_write(page, from, to, hfsplus_get_block,
+		&HFSPLUS_I(page->mapping->host).mmu_private);
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+static int hfsplus_bmap(struct address_space *mapping, long block)
+#else
+static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block)
+#endif
+{
+	return generic_block_bmap(mapping, block, hfsplus_get_block);
+}
+
+int hfsplus_releasepage(struct page *page, int mask)
+{
+	struct inode *inode = page->mapping->host;
+	struct super_block *sb = inode->i_sb;
+	struct hfsplus_btree *tree;
+	hfsplus_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->node_size >= PAGE_CACHE_SIZE) {
+		nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT);
+		spin_lock(&tree->hash_lock);
+		node = __hfsplus_find_bnode(tree, nidx);
+		if (!node)
+			;
+		else if (atomic_read(&node->refcnt))
+			res = 0;
+		else for (i = 0; i < tree->pages_per_bnode; i++) {
+			if (PageActive(node->page[i])) {
+				res = 0;
+				break;
+			}
+		}
+		if (res && node) {
+			__hfsplus_bnode_remove(node);
+			hfsplus_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 = __hfsplus_find_bnode(tree, nidx++);
+			if (!node)
+				continue;
+			if (atomic_read(&node->refcnt)) {
+				res = 0;
+				break;
+			}
+			__hfsplus_bnode_remove(node);
+			hfsplus_bnode_free(node);
+		} while (--i);
+		spin_unlock(&tree->hash_lock);
+	}
+	//printk("releasepage: %lu,%x = %d\n", page->index, mask, res);
+	return res;
+}
+
+struct address_space_operations hfsplus_btree_aops = {
+	.readpage	= hfsplus_readpage,
+	.writepage	= hfsplus_writepage,
+	.sync_page	= block_sync_page,
+	.prepare_write	= hfsplus_prepare_write,
+	.commit_write	= generic_commit_write,
+	.bmap		= hfsplus_bmap,
+	.releasepage	= hfsplus_releasepage,
+};
+
+struct address_space_operations hfsplus_aops = {
+	.readpage	= hfsplus_readpage,
+	.writepage	= hfsplus_writepage,
+	.sync_page	= block_sync_page,
+	.prepare_write	= hfsplus_prepare_write,
+	.commit_write	= generic_commit_write,
+	.bmap		= hfsplus_bmap,
+};
+
+static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dentry)
+{
+	struct hfsplus_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;
+	HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC;
+
+	hfsplus_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);
+	hfsplus_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);
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+	list_add(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes);
+#else
+	hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes);
+#endif
+	mark_inode_dirty(inode);
+	{
+	void hfsplus_inode_check(struct super_block *sb);
+	atomic_inc(&HFSPLUS_SB(sb).inode_cnt);
+	hfsplus_inode_check(sb);
+	}
+out:
+	d_add(dentry, inode);
+	return NULL;
+}
+
+static void hfsplus_get_perms(struct inode *inode, hfsplus_perm *perms, int dir)
+{
+	struct super_block *sb = inode->i_sb;
+	int mode;
+
+	mode = be32_to_cpu(perms->mode) & 0xffff;
+
+	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;
+}
+
+static void hfsplus_set_perms(struct inode *inode, hfsplus_perm *perms)
+{
+	perms->mode = cpu_to_be32(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 (atomic_read(&file->f_count) != 1)
+		return 0;
+	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_read(&file->f_count) != 0)
+		return 0;
+	if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) {
+		down(&inode->i_sem);
+		if (inode->i_flags & S_DEAD) {
+			hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
+			hfsplus_delete_inode(inode);
+		}
+		up(&inode->i_sem);
+	}
+	return 0;
+}
+
+extern struct inode_operations hfsplus_dir_inode_operations;
+extern struct file_operations hfsplus_dir_operations;
+
+struct inode_operations hfsplus_file_inode_operations = {
+	.lookup		= hfsplus_file_lookup,
+	.truncate	= hfsplus_truncate,
+};
+
+struct file_operations hfsplus_file_operations = {
+	.llseek 	= generic_file_llseek,
+	.read		= generic_file_read,
+	//.write	= hfsplus_file_write,
+	.write		= generic_file_write,
+	.mmap		= generic_file_mmap,
+	.fsync		= file_fsync,
+	.open		= hfsplus_file_open,
+	.release	= hfsplus_file_release,
+};
+
+struct inode *hfsplus_new_inode(struct super_block *sb, int mode)
+{
+	struct inode *inode = new_inode(sb);
+	if (!inode)
+		return NULL;
+
+	{
+	void hfsplus_inode_check(struct super_block *sb);
+	atomic_inc(&HFSPLUS_SB(sb).inode_cnt);
+	hfsplus_inode_check(sb);
+	}
+	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;
+	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;
+		INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
+	} 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;
+	} 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;
+	} 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_truncate(inode);
+		}
+	} else if (S_ISLNK(inode->i_mode)) {
+		inode->i_size = 0;
+		hfsplus_truncate(inode);
+	}
+	sb->s_dirt = 1;
+}
+
+void hfsplus_inode_read_fork(struct inode *inode, hfsplus_fork_raw *fork)
+{
+	u32 count;
+	int i;
+
+	memcpy(&HFSPLUS_I(inode).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).extent_blocks = count;
+	HFSPLUS_I(inode).total_blocks = HFSPLUS_I(inode).alloc_blocks =
+		be32_to_cpu(fork->total_blocks);
+	inode->i_size = HFSPLUS_I(inode).mmu_private = be64_to_cpu(fork->total_size);
+	inode->i_blocks = be32_to_cpu(fork->total_blocks);
+}
+
+void hfsplus_inode_write_fork(struct inode *inode, hfsplus_fork_raw *fork)
+{
+	memcpy(&fork->extents, &HFSPLUS_I(inode).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 hfsplus_find_data *fd)
+{
+	hfsplus_cat_entry entry;
+	int res = 0;
+	u16 type;
+
+	type = hfsplus_bnode_read_u16(fd->bnode, fd->entryoffset);
+
+	HFSPLUS_I(inode).dev = 0;
+	inode->i_blksize = PAGE_SIZE; /* Doesn't seem to be useful... */
+	if (type == HFSPLUS_FOLDER) {
+		hfsplus_cat_folder *folder = &entry.folder;
+
+		if (fd->entrylength < sizeof(hfsplus_cat_folder))
+			/* panic? */;
+		hfsplus_bnode_readbytes(fd->bnode, &entry, fd->entryoffset,
+					sizeof(hfsplus_cat_folder));
+		memset(&HFSPLUS_I(inode).extents, 0,
+		       sizeof(hfsplus_extent_rec));
+		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 = inode->i_mtime;
+		inode->i_blocks = 0;
+		inode->i_op = &hfsplus_dir_inode_operations;
+		inode->i_fop = &hfsplus_dir_operations;
+		INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
+	} else if (type == HFSPLUS_FILE) {
+		hfsplus_cat_file *file = &entry.file;
+
+		if (fd->entrylength < sizeof(hfsplus_cat_file))
+			/* panic? */;
+		hfsplus_bnode_readbytes(fd->bnode, &entry, fd->entryoffset,
+					sizeof(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 = inode->i_mtime;
+	} else {
+		printk("HFS+-fs: bad catalog entry used to create inode\n");
+		res = -EIO;
+	}
+	return res;
+}
+
+void hfsplus_cat_write_inode(struct inode *inode)
+{
+	struct hfsplus_find_data fd;
+	hfsplus_cat_entry entry;
+
+	if (HFSPLUS_IS_RSRC(inode)) {
+		mark_inode_dirty(HFSPLUS_I(inode).rsrc_inode);
+		return;
+	}
+
+	if (!inode->i_nlink)
+		return;
+
+	if (hfsplus_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd))
+		/* panic? */
+		return;
+
+	if (hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd))
+		/* panic? */
+		goto out;
+
+	if (S_ISDIR(inode->i_mode)) {
+		hfsplus_cat_folder *folder = &entry.folder;
+
+		if (fd.entrylength < sizeof(hfsplus_cat_folder))
+			/* panic? */;
+		hfsplus_bnode_readbytes(fd.bnode, &entry, fd.entryoffset,
+					sizeof(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);
+		hfsplus_bnode_writebytes(fd.bnode, &entry, fd.entryoffset,
+					 sizeof(hfsplus_cat_folder));
+	} else {
+		hfsplus_cat_file *file = &entry.file;
+
+		if (fd.entrylength < sizeof(hfsplus_cat_file))
+			/* panic? */;
+		hfsplus_bnode_readbytes(fd.bnode, &entry, fd.entryoffset,
+					sizeof(hfsplus_cat_file));
+		hfsplus_inode_write_fork(inode, &file->data_fork);
+		if (HFSPLUS_I(inode).rsrc_inode)
+			hfsplus_inode_write_fork(HFSPLUS_I(inode).rsrc_inode, &file->rsrc_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);
+		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);
+		hfsplus_bnode_writebytes(fd.bnode, &entry, fd.entryoffset,
+					 sizeof(hfsplus_cat_file));
+	}
+out:
+	hfsplus_find_exit(&fd);
+}