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

• Lines: 524
• Date: 2003-08-25 04:44:43.000000000 -0700
• Orig file: linux-2.4.21/fs/hfsplus/super.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/fs/hfsplus/super.c linux-2.4.22/fs/hfsplus/super.c
@@ -0,0 +1,523 @@
+/*
+ *  linux/fs/hfsplus/super.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/version.h>
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+#include <linux/locks.h>
+#else
+#include <linux/buffer_head.h>
+#include <linux/vfs.h>
+
+static struct inode *hfsplus_alloc_inode(struct super_block *sb);
+static void hfsplus_destroy_inode(struct inode *inode);
+#endif
+
+#include "hfsplus_fs.h"
+
+void hfsplus_inode_check(struct super_block *sb)
+{
+#if 0
+	u32 cnt = atomic_read(&HFSPLUS_SB(sb).inode_cnt);
+	u32 last_cnt = HFSPLUS_SB(sb).last_inode_cnt;
+
+	if (cnt <= (last_cnt / 2) ||
+	    cnt >= (last_cnt * 2)) {
+		HFSPLUS_SB(sb).last_inode_cnt = cnt;
+		printk("inode_check: %u,%u,%u\n", cnt, last_cnt,
+			HFSPLUS_SB(sb).cat_tree ? HFSPLUS_SB(sb).cat_tree->node_hash_cnt : 0);
+	}
+#endif
+}
+
+static void hfsplus_read_inode(struct inode *inode)
+{
+	struct hfsplus_find_data fd;
+	struct hfsplus_vh *vhdr;
+	int err;
+
+	atomic_inc(&HFSPLUS_SB(inode->i_sb).inode_cnt);
+	hfsplus_inode_check(inode->i_sb);
+	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
+	read_inode:
+		HFSPLUS_I(inode).flags = 0;
+		hfsplus_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
+		err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
+		if (!err)
+			err = hfsplus_cat_read_inode(inode, &fd);
+		hfsplus_find_exit(&fd);
+		if (err)
+			goto bad_inode;
+		return;
+	}
+	vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
+	switch(inode->i_ino) {
+	case HFSPLUS_ROOT_CNID:
+		goto read_inode;
+	case HFSPLUS_EXT_CNID:
+		hfsplus_inode_read_fork(inode, &vhdr->ext_file);
+		inode->i_mapping->a_ops = &hfsplus_btree_aops;
+		break;
+	case HFSPLUS_CAT_CNID:
+		hfsplus_inode_read_fork(inode, &vhdr->cat_file);
+		inode->i_mapping->a_ops = &hfsplus_btree_aops;
+		break;
+	case HFSPLUS_ALLOC_CNID:
+		hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
+		break;
+	case HFSPLUS_START_CNID:
+		hfsplus_inode_read_fork(inode, &vhdr->start_file);
+		break;
+	case HFSPLUS_ATTR_CNID:
+		hfsplus_inode_read_fork(inode, &vhdr->attr_file);
+		inode->i_mapping->a_ops = &hfsplus_btree_aops;
+		break;
+	default:
+		goto bad_inode;
+	}
+	
+	return;
+
+ bad_inode:
+	make_bad_inode(inode);
+}
+
+void hfsplus_write_inode(struct inode *inode, int unused)
+{
+	struct hfsplus_vh *vhdr;
+
+	dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
+	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
+		hfsplus_cat_write_inode(inode);
+		return;
+	}
+	vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
+	switch (inode->i_ino) {
+	case HFSPLUS_ROOT_CNID:
+		hfsplus_cat_write_inode(inode);
+		break;
+	case HFSPLUS_EXT_CNID:
+		if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
+			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
+			inode->i_sb->s_dirt = 1;
+		}
+		hfsplus_inode_write_fork(inode, &vhdr->ext_file);
+		hfsplus_write_btree(HFSPLUS_SB(inode->i_sb).ext_tree);
+		break;
+	case HFSPLUS_CAT_CNID:
+		if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
+			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
+			inode->i_sb->s_dirt = 1;
+		}
+		hfsplus_inode_write_fork(inode, &vhdr->cat_file);
+		hfsplus_write_btree(HFSPLUS_SB(inode->i_sb).cat_tree);
+		break;
+	case HFSPLUS_ALLOC_CNID:
+		if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
+			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
+			inode->i_sb->s_dirt = 1;
+		}
+		hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
+		break;
+	case HFSPLUS_START_CNID:
+		if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
+			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
+			inode->i_sb->s_dirt = 1;
+		}
+		hfsplus_inode_write_fork(inode, &vhdr->start_file);
+		break;
+	case HFSPLUS_ATTR_CNID:
+		if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
+			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
+			inode->i_sb->s_dirt = 1;
+		}
+		hfsplus_inode_write_fork(inode, &vhdr->attr_file);
+		hfsplus_write_btree(HFSPLUS_SB(inode->i_sb).attr_tree);
+		break;
+	}
+}
+
+static void hfsplus_clear_inode(struct inode *inode)
+{
+	atomic_dec(&HFSPLUS_SB(inode->i_sb).inode_cnt);
+	if (HFSPLUS_IS_RSRC(inode)) {
+		HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
+		iput(HFSPLUS_I(inode).rsrc_inode);
+	}
+	hfsplus_inode_check(inode->i_sb);
+}
+
+static void hfsplus_write_super(struct super_block *sb)
+{
+	struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
+
+	dprint(DBG_SUPER, "hfsplus_write_super\n");
+	sb->s_dirt = 0;
+	if (sb->s_flags & MS_RDONLY)
+		/* warn? */
+		return;
+
+	vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
+	vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
+	vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
+	vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
+	vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
+
+	mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
+	if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
+		if (HFSPLUS_SB(sb).sect_count) {
+			struct buffer_head *bh;
+			u32 block, offset;
+
+			block = HFSPLUS_SB(sb).blockoffset;
+			block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
+			offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
+			//printk("backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
+			//	HFSPLUS_SB(sb).sect_count, block, offset);
+			bh = sb_bread(sb, block);
+			vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
+			if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
+				memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
+				mark_buffer_dirty(bh);
+				brelse(bh);
+			} else
+				printk("backup not found!\n");
+		}
+		HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
+	}
+}
+
+static void hfsplus_put_super(struct super_block *sb)
+{
+	dprint(DBG_SUPER, "hfsplus_put_super\n");
+	if (!(sb->s_flags & MS_RDONLY)) {
+		struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
+
+		vhdr->modify_date = hfsp_now2mt();
+		vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
+		vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
+		mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
+		ll_rw_block(WRITE, 1, &HFSPLUS_SB(sb).s_vhbh);
+		wait_on_buffer(HFSPLUS_SB(sb).s_vhbh);
+	}
+
+	hfsplus_close_btree(HFSPLUS_SB(sb).cat_tree);
+	hfsplus_close_btree(HFSPLUS_SB(sb).ext_tree);
+	iput(HFSPLUS_SB(sb).alloc_file);
+	iput(HFSPLUS_SB(sb).hidden_dir);
+	brelse(HFSPLUS_SB(sb).s_vhbh);
+}
+
+static int hfsplus_statfs(struct super_block *sb, struct statfs *buf)
+{
+	buf->f_type = HFSPLUS_SUPER_MAGIC;
+	buf->f_bsize = sb->s_blocksize;
+	buf->f_blocks = be32_to_cpu(HFSPLUS_SB(sb).s_vhdr->total_blocks);
+	buf->f_bfree = HFSPLUS_SB(sb).free_blocks;
+	buf->f_bavail = buf->f_bfree;
+	buf->f_files = 0xFFFFFFFF;
+	buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
+	buf->f_namelen = HFSPLUS_MAX_STRLEN;
+
+	return 0;
+}
+
+int hfsplus_remount(struct super_block *sb, int *flags, char *data)
+{
+	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
+		return 0;
+	if (!(*flags & MS_RDONLY)) {
+		struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
+
+		if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_INCNSTNT)) ||
+		    !(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
+			printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
+			       "running fsck.hfsplus is recommended.  leaving read-only.\n");
+			sb->s_flags |= MS_RDONLY;
+			*flags |= MS_RDONLY;
+		} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
+			printk("HFS+-fs: Filesystem is marked locked, leaving read-only.\n");
+			sb->s_flags |= MS_RDONLY;
+			*flags |= MS_RDONLY;
+		}
+	}
+	return 0;
+}
+
+static struct super_operations hfsplus_sops = {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
+	.alloc_inode	= hfsplus_alloc_inode,
+	.destroy_inode	= hfsplus_destroy_inode,
+#endif
+	.read_inode	= hfsplus_read_inode,
+	.write_inode	= hfsplus_write_inode,
+	.clear_inode	= hfsplus_clear_inode,
+	.put_super	= hfsplus_put_super,
+	.write_super	= hfsplus_write_super,
+	.statfs		= hfsplus_statfs,
+	.remount_fs	= hfsplus_remount,
+};
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+struct super_block *hfsplus_read_super(struct super_block *sb, void *data,
+				       int silent)
+#else
+static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
+#endif
+{
+	struct hfsplus_vh *vhdr;
+	struct hfsplus_sb_info *sbi;
+	hfsplus_cat_entry entry;
+	struct hfsplus_find_data fd;
+	struct qstr str;
+	int err = -EINVAL;
+
+	sbi = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
+	if (!sbi) {
+		err = -ENOMEM;
+		goto out2;
+	}
+	memset(sbi, 0, sizeof(HFSPLUS_SB(sb)));
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+	if (sizeof(struct inode) - offsetof(struct inode, u) < sizeof(struct hfsplus_inode_info)) {
+		extern void hfsplus_inode_info_exceeded_space_in_inode_error(void);
+		hfsplus_inode_info_exceeded_space_in_inode_error();
+	}
+
+	if (sizeof(struct super_block) - offsetof(struct super_block, u) < sizeof(struct hfsplus_sb_info)) {
+		extern void hfsplus_sb_info_exceeded_space_in_super_block_error(void);
+		hfsplus_sb_info_exceeded_space_in_super_block_error();
+	}
+
+	INIT_LIST_HEAD(&HFSPLUS_SB(sb).rsrc_inodes);
+#else
+	sb->s_fs_info = sbi;
+	INIT_HLIST_HEAD(&sbi->rsrc_inodes);
+#endif
+	fill_defaults(sbi);
+	if (!parse_options(data, sbi)) {
+		if (!silent)
+			printk("HFS+-fs: unable to parse mount options\n");
+		err = -EINVAL;
+		goto out2;
+	}
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+	fill_current(sbi, &HFSPLUS_SB(sb));
+	kfree(sbi);
+#endif
+
+	/* Grab the volume header */
+	if (hfsplus_read_wrapper(sb)) {
+		if (!silent)
+			printk("HFS+-fs: unable to find HFS+ superblock\n");
+		err = -EINVAL;
+		goto out2;
+	}
+	vhdr = HFSPLUS_SB(sb).s_vhdr;
+
+	/* Copy parts of the volume header into the superblock */
+	sb->s_magic = be16_to_cpu(vhdr->signature);
+	if (be16_to_cpu(vhdr->version) != HFSPLUS_CURRENT_VERSION) {
+		if (!silent)
+			printk("HFS+-fs: wrong filesystem version\n");
+		goto cleanup;
+	}
+	HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
+	HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
+	HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
+	HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
+	HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
+	HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
+
+	/* Set up operations so we can load metadata */
+	sb->s_op = &hfsplus_sops;
+
+	if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_INCNSTNT)) ||
+	    !(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
+		if (!silent)
+			printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
+			       "running fsck.hfsplus is recommended.  mounting read-only.\n");
+		sb->s_flags |= MS_RDONLY;
+	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
+		if (!silent)
+			printk("HFS+-fs: Filesystem is marked locked, mounting read-only.\n");
+		sb->s_flags |= MS_RDONLY;
+	}
+
+	/* Load metadata objects (B*Trees) */
+	HFSPLUS_SB(sb).ext_tree = hfsplus_open_btree(sb, HFSPLUS_EXT_CNID);
+	if (!HFSPLUS_SB(sb).ext_tree) {
+		if (!silent)
+			printk("HFS+-fs: failed to load extents file\n");
+		goto cleanup;
+	}
+	HFSPLUS_SB(sb).cat_tree = hfsplus_open_btree(sb, HFSPLUS_CAT_CNID);
+	if (!HFSPLUS_SB(sb).cat_tree) {
+		if (!silent)
+			printk("HFS+-fs: failed to load catalog file\n");
+		goto cleanup;
+	}
+
+	HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID);
+	if (!HFSPLUS_SB(sb).alloc_file) {
+		if (!silent)
+			printk("HFS+-fs: failed to load allocation file\n");
+		goto cleanup;
+	}
+
+	/* Load the root directory */
+	sb->s_root = d_alloc_root(iget(sb, HFSPLUS_ROOT_CNID));
+	if (!sb->s_root) {
+		if (!silent)
+			printk("HFS+-fs: failed to load root directory\n");
+		goto cleanup;
+	}
+
+	str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
+	str.name = HFSP_HIDDENDIR_NAME;
+	hfsplus_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
+	hfsplus_fill_cat_key(fd.search_key, HFSPLUS_ROOT_CNID, &str);
+	if (!hfsplus_btree_find_entry(&fd, &entry, sizeof(entry))) {
+		hfsplus_find_exit(&fd);
+		if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
+			goto cleanup;
+		HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id));
+		if (!HFSPLUS_SB(sb).hidden_dir)
+			goto cleanup;
+	} else
+		hfsplus_find_exit(&fd);
+
+	if (sb->s_flags & MS_RDONLY)
+		goto out;
+
+	/* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
+	 * all three are registered with Apple for our use
+	 */
+	vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
+	vhdr->modify_date = hfsp_now2mt();
+	vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1);
+	vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
+	vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
+	mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
+	ll_rw_block(WRITE, 1, &HFSPLUS_SB(sb).s_vhbh);
+	wait_on_buffer(HFSPLUS_SB(sb).s_vhbh);
+
+	if (!HFSPLUS_SB(sb).hidden_dir) {
+		printk("HFS+: create hidden dir...\n");
+		HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
+		hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
+				   &str, HFSPLUS_SB(sb).hidden_dir);
+		mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
+	}
+out:
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+	return sb;
+#else
+	return 0;
+#endif
+
+cleanup:
+	hfsplus_put_super(sb);
+out2:
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+	return NULL;
+#else
+	return err;
+#endif
+}
+
+MODULE_AUTHOR("Brad Boyer");
+MODULE_DESCRIPTION("Extended Macintosh Filesystem");
+MODULE_LICENSE("GPL");
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+
+static DECLARE_FSTYPE_DEV(hfsplus_fs_type, "hfsplus", hfsplus_read_super);
+
+static int __init init_hfsplus_fs(void)
+{
+	return register_filesystem(&hfsplus_fs_type);
+}
+
+static void __exit exit_hfsplus_fs(void)
+{
+	unregister_filesystem(&hfsplus_fs_type);
+}
+
+EXPORT_NO_SYMBOLS;
+
+#else
+
+static kmem_cache_t * hfsplus_inode_cachep;
+
+static void init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
+{
+	struct hfsplus_inode_info *i = (struct hfsplus_inode_info *)p;
+
+	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR) {
+		inode_init_once(&i->vfs_inode);
+	}
+}
+
+static struct inode *hfsplus_alloc_inode(struct super_block *sb)
+{
+	struct hfsplus_inode_info *i;
+	i = (struct hfsplus_inode_info *)kmem_cache_alloc(hfsplus_inode_cachep, SLAB_KERNEL);
+	return i ? &i->vfs_inode : NULL;
+}
+
+static void hfsplus_destroy_inode(struct inode *inode)
+{
+	kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
+}
+
+static struct super_block *hfsplus_get_sb(struct file_system_type *fs_type,
+					  int flags, char *dev_name, void *data)
+{
+	return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
+}
+
+static struct file_system_type hfsplus_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "hfsplus",
+	.get_sb		= hfsplus_get_sb,
+	.kill_sb	= kill_block_super,
+	.fs_flags	= FS_REQUIRES_DEV,
+};
+
+static int __init init_hfsplus_fs(void)
+{
+	int err;
+
+	hfsplus_inode_cachep = kmem_cache_create("hfsplus_inode_cache",
+		sizeof(struct hfsplus_inode_info), 0, SLAB_HWCACHE_ALIGN,
+		init_once, NULL);
+	if (!hfsplus_inode_cachep)
+		return -ENOMEM;
+	err = register_filesystem(&hfsplus_fs_type);
+	if (err)
+		kmem_cache_destroy(hfsplus_inode_cachep);
+	return err;
+}
+
+static void __exit exit_hfsplus_fs(void)
+{
+	unregister_filesystem(&hfsplus_fs_type);
+	if (kmem_cache_destroy(hfsplus_inode_cachep))
+		printk(KERN_INFO "hfsplus_inode_cache: not all structures were freed\n");
+}
+#endif
+
+module_init(init_hfsplus_fs)
+module_exit(exit_hfsplus_fs)