Initial import

1 files changed, 649 insertions, 0 deletions

diff --git a/fs/affs/super.c b/fs/affs/super.c
new file mode 100644
index 000000000..3f89c9e05
--- /dev/null
+++ b/fs/affs/super.c
@@ -0,0 +1,649 @@
+/*
+ *  linux/fs/affs/inode.c
+ *
+ *  (c) 1996  Hans-Joachim Widmaier - Rewritten
+ *
+ *  (C) 1993  Ray Burr - Modified for Amiga FFS filesystem.
+ *
+ *  (C) 1992  Eric Youngdale Modified for ISO 9660 filesystem.
+ *
+ *  (C) 1991  Linus Torvalds - minix filesystem
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/statfs.h>
+#include <linux/parser.h>
+#include <linux/magic.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/writeback.h>
+#include "affs.h"
+
+static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
+static int affs_remount (struct super_block *sb, int *flags, char *data);
+
+static void
+affs_commit_super(struct super_block *sb, int wait)
+{
+	struct affs_sb_info *sbi = AFFS_SB(sb);
+	struct buffer_head *bh = sbi->s_root_bh;
+	struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
+
+	lock_buffer(bh);
+	secs_to_datestamp(get_seconds(), &tail->disk_change);
+	affs_fix_checksum(sb, bh);
+	unlock_buffer(bh);
+
+	mark_buffer_dirty(bh);
+	if (wait)
+		sync_dirty_buffer(bh);
+}
+
+static void
+affs_put_super(struct super_block *sb)
+{
+	struct affs_sb_info *sbi = AFFS_SB(sb);
+	pr_debug("%s()\n", __func__);
+
+	cancel_delayed_work_sync(&sbi->sb_work);
+}
+
+static int
+affs_sync_fs(struct super_block *sb, int wait)
+{
+	affs_commit_super(sb, wait);
+	return 0;
+}
+
+static void flush_superblock(struct work_struct *work)
+{
+	struct affs_sb_info *sbi;
+	struct super_block *sb;
+
+	sbi = container_of(work, struct affs_sb_info, sb_work.work);
+	sb = sbi->sb;
+
+	spin_lock(&sbi->work_lock);
+	sbi->work_queued = 0;
+	spin_unlock(&sbi->work_lock);
+
+	affs_commit_super(sb, 1);
+}
+
+void affs_mark_sb_dirty(struct super_block *sb)
+{
+	struct affs_sb_info *sbi = AFFS_SB(sb);
+	unsigned long delay;
+
+	if (sb->s_flags & MS_RDONLY)
+	       return;
+
+	spin_lock(&sbi->work_lock);
+	if (!sbi->work_queued) {
+	       delay = msecs_to_jiffies(dirty_writeback_interval * 10);
+	       queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
+	       sbi->work_queued = 1;
+	}
+	spin_unlock(&sbi->work_lock);
+}
+
+static struct kmem_cache * affs_inode_cachep;
+
+static struct inode *affs_alloc_inode(struct super_block *sb)
+{
+	struct affs_inode_info *i;
+
+	i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
+	if (!i)
+		return NULL;
+
+	i->vfs_inode.i_version = 1;
+	i->i_lc = NULL;
+	i->i_ext_bh = NULL;
+	i->i_pa_cnt = 0;
+
+	return &i->vfs_inode;
+}
+
+static void affs_i_callback(struct rcu_head *head)
+{
+	struct inode *inode = container_of(head, struct inode, i_rcu);
+	kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
+}
+
+static void affs_destroy_inode(struct inode *inode)
+{
+	call_rcu(&inode->i_rcu, affs_i_callback);
+}
+
+static void init_once(void *foo)
+{
+	struct affs_inode_info *ei = (struct affs_inode_info *) foo;
+
+	sema_init(&ei->i_link_lock, 1);
+	sema_init(&ei->i_ext_lock, 1);
+	inode_init_once(&ei->vfs_inode);
+}
+
+static int __init init_inodecache(void)
+{
+	affs_inode_cachep = kmem_cache_create("affs_inode_cache",
+					     sizeof(struct affs_inode_info),
+					     0, (SLAB_RECLAIM_ACCOUNT|
+						SLAB_MEM_SPREAD),
+					     init_once);
+	if (affs_inode_cachep == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+static void destroy_inodecache(void)
+{
+	/*
+	 * Make sure all delayed rcu free inodes are flushed before we
+	 * destroy cache.
+	 */
+	rcu_barrier();
+	kmem_cache_destroy(affs_inode_cachep);
+}
+
+static const struct super_operations affs_sops = {
+	.alloc_inode	= affs_alloc_inode,
+	.destroy_inode	= affs_destroy_inode,
+	.write_inode	= affs_write_inode,
+	.evict_inode	= affs_evict_inode,
+	.put_super	= affs_put_super,
+	.sync_fs	= affs_sync_fs,
+	.statfs		= affs_statfs,
+	.remount_fs	= affs_remount,
+	.show_options	= generic_show_options,
+};
+
+enum {
+	Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
+	Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
+	Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
+};
+
+static const match_table_t tokens = {
+	{Opt_bs, "bs=%u"},
+	{Opt_mode, "mode=%o"},
+	{Opt_mufs, "mufs"},
+	{Opt_notruncate, "nofilenametruncate"},
+	{Opt_prefix, "prefix=%s"},
+	{Opt_protect, "protect"},
+	{Opt_reserved, "reserved=%u"},
+	{Opt_root, "root=%u"},
+	{Opt_setgid, "setgid=%u"},
+	{Opt_setuid, "setuid=%u"},
+	{Opt_verbose, "verbose"},
+	{Opt_volume, "volume=%s"},
+	{Opt_ignore, "grpquota"},
+	{Opt_ignore, "noquota"},
+	{Opt_ignore, "quota"},
+	{Opt_ignore, "usrquota"},
+	{Opt_err, NULL},
+};
+
+static int
+parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root,
+		int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
+{
+	char *p;
+	substring_t args[MAX_OPT_ARGS];
+
+	/* Fill in defaults */
+
+	*uid        = current_uid();
+	*gid        = current_gid();
+	*reserved   = 2;
+	*root       = -1;
+	*blocksize  = -1;
+	volume[0]   = ':';
+	volume[1]   = 0;
+	*mount_opts = 0;
+	if (!options)
+		return 1;
+
+	while ((p = strsep(&options, ",")) != NULL) {
+		int token, n, option;
+		if (!*p)
+			continue;
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case Opt_bs:
+			if (match_int(&args[0], &n))
+				return 0;
+			if (n != 512 && n != 1024 && n != 2048
+			    && n != 4096) {
+				pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
+				return 0;
+			}
+			*blocksize = n;
+			break;
+		case Opt_mode:
+			if (match_octal(&args[0], &option))
+				return 0;
+			*mode = option & 0777;
+			affs_set_opt(*mount_opts, SF_SETMODE);
+			break;
+		case Opt_mufs:
+			affs_set_opt(*mount_opts, SF_MUFS);
+			break;
+		case Opt_notruncate:
+			affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
+			break;
+		case Opt_prefix:
+			*prefix = match_strdup(&args[0]);
+			if (!*prefix)
+				return 0;
+			affs_set_opt(*mount_opts, SF_PREFIX);
+			break;
+		case Opt_protect:
+			affs_set_opt(*mount_opts, SF_IMMUTABLE);
+			break;
+		case Opt_reserved:
+			if (match_int(&args[0], reserved))
+				return 0;
+			break;
+		case Opt_root:
+			if (match_int(&args[0], root))
+				return 0;
+			break;
+		case Opt_setgid:
+			if (match_int(&args[0], &option))
+				return 0;
+			*gid = make_kgid(current_user_ns(), option);
+			if (!gid_valid(*gid))
+				return 0;
+			affs_set_opt(*mount_opts, SF_SETGID);
+			break;
+		case Opt_setuid:
+			if (match_int(&args[0], &option))
+				return 0;
+			*uid = make_kuid(current_user_ns(), option);
+			if (!uid_valid(*uid))
+				return 0;
+			affs_set_opt(*mount_opts, SF_SETUID);
+			break;
+		case Opt_verbose:
+			affs_set_opt(*mount_opts, SF_VERBOSE);
+			break;
+		case Opt_volume: {
+			char *vol = match_strdup(&args[0]);
+			if (!vol)
+				return 0;
+			strlcpy(volume, vol, 32);
+			kfree(vol);
+			break;
+		}
+		case Opt_ignore:
+		 	/* Silently ignore the quota options */
+			break;
+		default:
+			pr_warn("Unrecognized mount option \"%s\" or missing value\n",
+				p);
+			return 0;
+		}
+	}
+	return 1;
+}
+
+/* This function definitely needs to be split up. Some fine day I'll
+ * hopefully have the guts to do so. Until then: sorry for the mess.
+ */
+
+static int affs_fill_super(struct super_block *sb, void *data, int silent)
+{
+	struct affs_sb_info	*sbi;
+	struct buffer_head	*root_bh = NULL;
+	struct buffer_head	*boot_bh;
+	struct inode		*root_inode = NULL;
+	s32			 root_block;
+	int			 size, blocksize;
+	u32			 chksum;
+	int			 num_bm;
+	int			 i, j;
+	kuid_t			 uid;
+	kgid_t			 gid;
+	int			 reserved;
+	unsigned long		 mount_flags;
+	int			 tmp_flags;	/* fix remount prototype... */
+	u8			 sig[4];
+	int			 ret;
+
+	save_mount_options(sb, data);
+
+	pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
+
+	sb->s_magic             = AFFS_SUPER_MAGIC;
+	sb->s_op                = &affs_sops;
+	sb->s_flags |= MS_NODIRATIME;
+
+	sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
+	if (!sbi)
+		return -ENOMEM;
+
+	sb->s_fs_info = sbi;
+	sbi->sb = sb;
+	mutex_init(&sbi->s_bmlock);
+	spin_lock_init(&sbi->symlink_lock);
+	spin_lock_init(&sbi->work_lock);
+	INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
+
+	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
+				&blocksize,&sbi->s_prefix,
+				sbi->s_volume, &mount_flags)) {
+		pr_err("Error parsing options\n");
+		return -EINVAL;
+	}
+	/* N.B. after this point s_prefix must be released */
+
+	sbi->s_flags   = mount_flags;
+	sbi->s_mode    = i;
+	sbi->s_uid     = uid;
+	sbi->s_gid     = gid;
+	sbi->s_reserved= reserved;
+
+	/* Get the size of the device in 512-byte blocks.
+	 * If we later see that the partition uses bigger
+	 * blocks, we will have to change it.
+	 */
+
+	size = sb->s_bdev->bd_inode->i_size >> 9;
+	pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
+
+	affs_set_blocksize(sb, PAGE_SIZE);
+	/* Try to find root block. Its location depends on the block size. */
+
+	i = 512;
+	j = 4096;
+	if (blocksize > 0) {
+		i = j = blocksize;
+		size = size / (blocksize / 512);
+	}
+	for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
+		sbi->s_root_block = root_block;
+		if (root_block < 0)
+			sbi->s_root_block = (reserved + size - 1) / 2;
+		pr_debug("setting blocksize to %d\n", blocksize);
+		affs_set_blocksize(sb, blocksize);
+		sbi->s_partition_size = size;
+
+		/* The root block location that was calculated above is not
+		 * correct if the partition size is an odd number of 512-
+		 * byte blocks, which will be rounded down to a number of
+		 * 1024-byte blocks, and if there were an even number of
+		 * reserved blocks. Ideally, all partition checkers should
+		 * report the real number of blocks of the real blocksize,
+		 * but since this just cannot be done, we have to try to
+		 * find the root block anyways. In the above case, it is one
+		 * block behind the calculated one. So we check this one, too.
+		 */
+		for (num_bm = 0; num_bm < 2; num_bm++) {
+			pr_debug("Dev %s, trying root=%u, bs=%d, "
+				"size=%d, reserved=%d\n",
+				sb->s_id,
+				sbi->s_root_block + num_bm,
+				blocksize, size, reserved);
+			root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
+			if (!root_bh)
+				continue;
+			if (!affs_checksum_block(sb, root_bh) &&
+			    be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
+			    be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
+				sbi->s_hashsize    = blocksize / 4 - 56;
+				sbi->s_root_block += num_bm;
+				goto got_root;
+			}
+			affs_brelse(root_bh);
+			root_bh = NULL;
+		}
+	}
+	if (!silent)
+		pr_err("No valid root block on device %s\n", sb->s_id);
+	return -EINVAL;
+
+	/* N.B. after this point bh must be released */
+got_root:
+	/* Keep super block in cache */
+	sbi->s_root_bh = root_bh;
+	root_block = sbi->s_root_block;
+
+	/* Find out which kind of FS we have */
+	boot_bh = sb_bread(sb, 0);
+	if (!boot_bh) {
+		pr_err("Cannot read boot block\n");
+		return -EINVAL;
+	}
+	memcpy(sig, boot_bh->b_data, 4);
+	brelse(boot_bh);
+	chksum = be32_to_cpu(*(__be32 *)sig);
+
+	/* Dircache filesystems are compatible with non-dircache ones
+	 * when reading. As long as they aren't supported, writing is
+	 * not recommended.
+	 */
+	if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
+	     || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
+		pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
+		sb->s_flags |= MS_RDONLY;
+	}
+	switch (chksum) {
+	case MUFS_FS:
+	case MUFS_INTLFFS:
+	case MUFS_DCFFS:
+		affs_set_opt(sbi->s_flags, SF_MUFS);
+		/* fall thru */
+	case FS_INTLFFS:
+	case FS_DCFFS:
+		affs_set_opt(sbi->s_flags, SF_INTL);
+		break;
+	case MUFS_FFS:
+		affs_set_opt(sbi->s_flags, SF_MUFS);
+		break;
+	case FS_FFS:
+		break;
+	case MUFS_OFS:
+		affs_set_opt(sbi->s_flags, SF_MUFS);
+		/* fall thru */
+	case FS_OFS:
+		affs_set_opt(sbi->s_flags, SF_OFS);
+		sb->s_flags |= MS_NOEXEC;
+		break;
+	case MUFS_DCOFS:
+	case MUFS_INTLOFS:
+		affs_set_opt(sbi->s_flags, SF_MUFS);
+	case FS_DCOFS:
+	case FS_INTLOFS:
+		affs_set_opt(sbi->s_flags, SF_INTL);
+		affs_set_opt(sbi->s_flags, SF_OFS);
+		sb->s_flags |= MS_NOEXEC;
+		break;
+	default:
+		pr_err("Unknown filesystem on device %s: %08X\n",
+		       sb->s_id, chksum);
+		return -EINVAL;
+	}
+
+	if (affs_test_opt(mount_flags, SF_VERBOSE)) {
+		u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
+		pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
+			len > 31 ? 31 : len,
+			AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
+			sig, sig[3] + '0', blocksize);
+	}
+
+	sb->s_flags |= MS_NODEV | MS_NOSUID;
+
+	sbi->s_data_blksize = sb->s_blocksize;
+	if (affs_test_opt(sbi->s_flags, SF_OFS))
+		sbi->s_data_blksize -= 24;
+
+	tmp_flags = sb->s_flags;
+	ret = affs_init_bitmap(sb, &tmp_flags);
+	if (ret)
+		return ret;
+	sb->s_flags = tmp_flags;
+
+	/* set up enough so that it can read an inode */
+
+	root_inode = affs_iget(sb, root_block);
+	if (IS_ERR(root_inode))
+		return PTR_ERR(root_inode);
+
+	if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
+		sb->s_d_op = &affs_intl_dentry_operations;
+	else
+		sb->s_d_op = &affs_dentry_operations;
+
+	sb->s_root = d_make_root(root_inode);
+	if (!sb->s_root) {
+		pr_err("AFFS: Get root inode failed\n");
+		return -ENOMEM;
+	}
+
+	pr_debug("s_flags=%lX\n", sb->s_flags);
+	return 0;
+}
+
+static int
+affs_remount(struct super_block *sb, int *flags, char *data)
+{
+	struct affs_sb_info	*sbi = AFFS_SB(sb);
+	int			 blocksize;
+	kuid_t			 uid;
+	kgid_t			 gid;
+	int			 mode;
+	int			 reserved;
+	int			 root_block;
+	unsigned long		 mount_flags;
+	int			 res = 0;
+	char			*new_opts;
+	char			 volume[32];
+	char			*prefix = NULL;
+
+	new_opts = kstrdup(data, GFP_KERNEL);
+	if (!new_opts)
+		return -ENOMEM;
+
+	pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
+
+	sync_filesystem(sb);
+	*flags |= MS_NODIRATIME;
+
+	memcpy(volume, sbi->s_volume, 32);
+	if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
+			   &blocksize, &prefix, volume,
+			   &mount_flags)) {
+		kfree(prefix);
+		kfree(new_opts);
+		return -EINVAL;
+	}
+
+	flush_delayed_work(&sbi->sb_work);
+	replace_mount_options(sb, new_opts);
+
+	sbi->s_flags = mount_flags;
+	sbi->s_mode  = mode;
+	sbi->s_uid   = uid;
+	sbi->s_gid   = gid;
+	/* protect against readers */
+	spin_lock(&sbi->symlink_lock);
+	if (prefix) {
+		kfree(sbi->s_prefix);
+		sbi->s_prefix = prefix;
+	}
+	memcpy(sbi->s_volume, volume, 32);
+	spin_unlock(&sbi->symlink_lock);
+
+	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
+		return 0;
+
+	if (*flags & MS_RDONLY)
+		affs_free_bitmap(sb);
+	else
+		res = affs_init_bitmap(sb, flags);
+
+	return res;
+}
+
+static int
+affs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+	struct super_block *sb = dentry->d_sb;
+	int		 free;
+	u64		 id = huge_encode_dev(sb->s_bdev->bd_dev);
+
+	pr_debug("%s() partsize=%d, reserved=%d\n",
+		 __func__, AFFS_SB(sb)->s_partition_size,
+		 AFFS_SB(sb)->s_reserved);
+
+	free          = affs_count_free_blocks(sb);
+	buf->f_type    = AFFS_SUPER_MAGIC;
+	buf->f_bsize   = sb->s_blocksize;
+	buf->f_blocks  = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
+	buf->f_bfree   = free;
+	buf->f_bavail  = free;
+	buf->f_fsid.val[0] = (u32)id;
+	buf->f_fsid.val[1] = (u32)(id >> 32);
+	buf->f_namelen = AFFSNAMEMAX;
+	return 0;
+}
+
+static struct dentry *affs_mount(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data)
+{
+	return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
+}
+
+static void affs_kill_sb(struct super_block *sb)
+{
+	struct affs_sb_info *sbi = AFFS_SB(sb);
+	kill_block_super(sb);
+	if (sbi) {
+		affs_free_bitmap(sb);
+		affs_brelse(sbi->s_root_bh);
+		kfree(sbi->s_prefix);
+		mutex_destroy(&sbi->s_bmlock);
+		kfree(sbi);
+	}
+}
+
+static struct file_system_type affs_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "affs",
+	.mount		= affs_mount,
+	.kill_sb	= affs_kill_sb,
+	.fs_flags	= FS_REQUIRES_DEV,
+};
+MODULE_ALIAS_FS("affs");
+
+static int __init init_affs_fs(void)
+{
+	int err = init_inodecache();
+	if (err)
+		goto out1;
+	err = register_filesystem(&affs_fs_type);
+	if (err)
+		goto out;
+	return 0;
+out:
+	destroy_inodecache();
+out1:
+	return err;
+}
+
+static void __exit exit_affs_fs(void)
+{
+	unregister_filesystem(&affs_fs_type);
+	destroy_inodecache();
+}
+
+MODULE_DESCRIPTION("Amiga filesystem support for Linux");
+MODULE_LICENSE("GPL");
+
+module_init(init_affs_fs)
+module_exit(exit_affs_fs)