1 files changed, 509 insertions, 0 deletions
diff --git a/fs/affs/amigaffs.c b/fs/affs/amigaffs.c
new file mode 100644
index 000000000000..ccd624ef4272
--- /dev/null
+++ b/fs/affs/amigaffs.c
@@ -0,0 +1,509 @@
+/*
+ *  linux/fs/affs/amigaffs.c
+ *
+ *  (c) 1996  Hans-Joachim Widmaier - Rewritten
+ *
+ *  (C) 1993  Ray Burr - Amiga FFS filesystem.
+ *
+ *  Please send bug reports to: hjw@zvw.de
+ */
+
+#include "affs.h"
+
+extern struct timezone sys_tz;
+
+static char ErrorBuffer[256];
+
+/*
+ * Functions for accessing Amiga-FFS structures.
+ */
+
+
+/* Insert a header block bh into the directory dir
+ * caller must hold AFFS_DIR->i_hash_lock!
+ */
+
+int
+affs_insert_hash(struct inode *dir, struct buffer_head *bh)
+{
+	struct super_block *sb = dir->i_sb;
+	struct buffer_head *dir_bh;
+	u32 ino, hash_ino;
+	int offset;
+
+	ino = bh->b_blocknr;
+	offset = affs_hash_name(sb, AFFS_TAIL(sb, bh)->name + 1, AFFS_TAIL(sb, bh)->name[0]);
+
+	pr_debug("AFFS: insert_hash(dir=%u, ino=%d)\n", (u32)dir->i_ino, ino);
+
+	dir_bh = affs_bread(sb, dir->i_ino);
+	if (!dir_bh)
+		return -EIO;
+
+	hash_ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[offset]);
+	while (hash_ino) {
+		affs_brelse(dir_bh);
+		dir_bh = affs_bread(sb, hash_ino);
+		if (!dir_bh)
+			return -EIO;
+		hash_ino = be32_to_cpu(AFFS_TAIL(sb, dir_bh)->hash_chain);
+	}
+	AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
+	AFFS_TAIL(sb, bh)->hash_chain = 0;
+	affs_fix_checksum(sb, bh);
+
+	if (dir->i_ino == dir_bh->b_blocknr)
+		AFFS_HEAD(dir_bh)->table[offset] = cpu_to_be32(ino);
+	else
+		AFFS_TAIL(sb, dir_bh)->hash_chain = cpu_to_be32(ino);
+
+	affs_adjust_checksum(dir_bh, ino);
+	mark_buffer_dirty_inode(dir_bh, dir);
+	affs_brelse(dir_bh);
+
+	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
+	dir->i_version++;
+	mark_inode_dirty(dir);
+
+	return 0;
+}
+
+/* Remove a header block from its directory.
+ * caller must hold AFFS_DIR->i_hash_lock!
+ */
+
+int
+affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh)
+{
+	struct super_block *sb;
+	struct buffer_head *bh;
+	u32 rem_ino, hash_ino;
+	__be32 ino;
+	int offset, retval;
+
+	sb = dir->i_sb;
+	rem_ino = rem_bh->b_blocknr;
+	offset = affs_hash_name(sb, AFFS_TAIL(sb, rem_bh)->name+1, AFFS_TAIL(sb, rem_bh)->name[0]);
+	pr_debug("AFFS: remove_hash(dir=%d, ino=%d, hashval=%d)\n", (u32)dir->i_ino, rem_ino, offset);
+
+	bh = affs_bread(sb, dir->i_ino);
+	if (!bh)
+		return -EIO;
+
+	retval = -ENOENT;
+	hash_ino = be32_to_cpu(AFFS_HEAD(bh)->table[offset]);
+	while (hash_ino) {
+		if (hash_ino == rem_ino) {
+			ino = AFFS_TAIL(sb, rem_bh)->hash_chain;
+			if (dir->i_ino == bh->b_blocknr)
+				AFFS_HEAD(bh)->table[offset] = ino;
+			else
+				AFFS_TAIL(sb, bh)->hash_chain = ino;
+			affs_adjust_checksum(bh, be32_to_cpu(ino) - hash_ino);
+			mark_buffer_dirty_inode(bh, dir);
+			AFFS_TAIL(sb, rem_bh)->parent = 0;
+			retval = 0;
+			break;
+		}
+		affs_brelse(bh);
+		bh = affs_bread(sb, hash_ino);
+		if (!bh)
+			return -EIO;
+		hash_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain);
+	}
+
+	affs_brelse(bh);
+
+	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
+	dir->i_version++;
+	mark_inode_dirty(dir);
+
+	return retval;
+}
+
+static void
+affs_fix_dcache(struct dentry *dentry, u32 entry_ino)
+{
+	struct inode *inode = dentry->d_inode;
+	void *data = dentry->d_fsdata;
+	struct list_head *head, *next;
+
+	spin_lock(&dcache_lock);
+	head = &inode->i_dentry;
+	next = head->next;
+	while (next != head) {
+		dentry = list_entry(next, struct dentry, d_alias);
+		if (entry_ino == (u32)(long)dentry->d_fsdata) {
+			dentry->d_fsdata = data;
+			break;
+		}
+		next = next->next;
+	}
+	spin_unlock(&dcache_lock);
+}
+
+
+/* Remove header from link chain */
+
+static int
+affs_remove_link(struct dentry *dentry)
+{
+	struct inode *dir, *inode = dentry->d_inode;
+	struct super_block *sb = inode->i_sb;
+	struct buffer_head *bh = NULL, *link_bh = NULL;
+	u32 link_ino, ino;
+	int retval;
+
+	pr_debug("AFFS: remove_link(key=%ld)\n", inode->i_ino);
+	retval = -EIO;
+	bh = affs_bread(sb, inode->i_ino);
+	if (!bh)
+		goto done;
+
+	link_ino = (u32)(long)dentry->d_fsdata;
+	if (inode->i_ino == link_ino) {
+		/* we can't remove the head of the link, as its blocknr is still used as ino,
+		 * so we remove the block of the first link instead.
+		 */ 
+		link_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain);
+		link_bh = affs_bread(sb, link_ino);
+		if (!link_bh)
+			goto done;
+
+		dir = iget(sb, be32_to_cpu(AFFS_TAIL(sb, link_bh)->parent));
+		if (!dir)
+			goto done;
+
+		affs_lock_dir(dir);
+		affs_fix_dcache(dentry, link_ino);
+		retval = affs_remove_hash(dir, link_bh);
+		if (retval)
+			goto done;
+		mark_buffer_dirty_inode(link_bh, inode);
+
+		memcpy(AFFS_TAIL(sb, bh)->name, AFFS_TAIL(sb, link_bh)->name, 32);
+		retval = affs_insert_hash(dir, bh);
+		if (retval)
+			goto done;
+		mark_buffer_dirty_inode(bh, inode);
+
+		affs_unlock_dir(dir);
+		iput(dir);
+	} else {
+		link_bh = affs_bread(sb, link_ino);
+		if (!link_bh)
+			goto done;
+	}
+
+	while ((ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain)) != 0) {
+		if (ino == link_ino) {
+			__be32 ino2 = AFFS_TAIL(sb, link_bh)->link_chain;
+			AFFS_TAIL(sb, bh)->link_chain = ino2;
+			affs_adjust_checksum(bh, be32_to_cpu(ino2) - link_ino);
+			mark_buffer_dirty_inode(bh, inode);
+			retval = 0;
+			/* Fix the link count, if bh is a normal header block without links */
+			switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
+			case ST_LINKDIR:
+			case ST_LINKFILE:
+				break;
+			default:
+				if (!AFFS_TAIL(sb, bh)->link_chain)
+					inode->i_nlink = 1;
+			}
+			affs_free_block(sb, link_ino);
+			goto done;
+		}
+		affs_brelse(bh);
+		bh = affs_bread(sb, ino);
+		if (!bh)
+			goto done;
+	}
+	retval = -ENOENT;
+done:
+	affs_brelse(link_bh);
+	affs_brelse(bh);
+	return retval;
+}
+
+
+static int
+affs_empty_dir(struct inode *inode)
+{
+	struct super_block *sb = inode->i_sb;
+	struct buffer_head *bh;
+	int retval, size;
+
+	retval = -EIO;
+	bh = affs_bread(sb, inode->i_ino);
+	if (!bh)
+		goto done;
+
+	retval = -ENOTEMPTY;
+	for (size = AFFS_SB(sb)->s_hashsize - 1; size >= 0; size--)
+		if (AFFS_HEAD(bh)->table[size])
+			goto not_empty;
+	retval = 0;
+not_empty:
+	affs_brelse(bh);
+done:
+	return retval;
+}
+
+
+/* Remove a filesystem object. If the object to be removed has
+ * links to it, one of the links must be changed to inherit
+ * the file or directory. As above, any inode will do.
+ * The buffer will not be freed. If the header is a link, the
+ * block will be marked as free.
+ * This function returns a negative error number in case of
+ * an error, else 0 if the inode is to be deleted or 1 if not.
+ */
+
+int
+affs_remove_header(struct dentry *dentry)
+{
+	struct super_block *sb;
+	struct inode *inode, *dir;
+	struct buffer_head *bh = NULL;
+	int retval;
+
+	dir = dentry->d_parent->d_inode;
+	sb = dir->i_sb;
+
+	retval = -ENOENT;
+	inode = dentry->d_inode;
+	if (!inode)
+		goto done;
+
+	pr_debug("AFFS: remove_header(key=%ld)\n", inode->i_ino);
+	retval = -EIO;
+	bh = affs_bread(sb, (u32)(long)dentry->d_fsdata);
+	if (!bh)
+		goto done;
+
+	affs_lock_link(inode);
+	affs_lock_dir(dir);
+	switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
+	case ST_USERDIR:
+		/* if we ever want to support links to dirs
+		 * i_hash_lock of the inode must only be
+		 * taken after some checks
+		 */
+		affs_lock_dir(inode);
+		retval = affs_empty_dir(inode);
+		affs_unlock_dir(inode);
+		if (retval)
+			goto done_unlock;
+		break;
+	default:
+		break;
+	}
+
+	retval = affs_remove_hash(dir, bh);
+	if (retval)
+		goto done_unlock;
+	mark_buffer_dirty_inode(bh, inode);
+
+	affs_unlock_dir(dir);
+
+	if (inode->i_nlink > 1)
+		retval = affs_remove_link(dentry);
+	else
+		inode->i_nlink = 0;
+	affs_unlock_link(inode);
+	inode->i_ctime = CURRENT_TIME_SEC;
+	mark_inode_dirty(inode);
+
+done:
+	affs_brelse(bh);
+	return retval;
+
+done_unlock:
+	affs_unlock_dir(dir);
+	affs_unlock_link(inode);
+	goto done;
+}
+
+/* Checksum a block, do various consistency checks and optionally return
+   the blocks type number.  DATA points to the block.  If their pointers
+   are non-null, *PTYPE and *STYPE are set to the primary and secondary
+   block types respectively, *HASHSIZE is set to the size of the hashtable
+   (which lets us calculate the block size).
+   Returns non-zero if the block is not consistent. */
+
+u32
+affs_checksum_block(struct super_block *sb, struct buffer_head *bh)
+{
+	__be32 *ptr = (__be32 *)bh->b_data;
+	u32 sum;
+	int bsize;
+
+	sum = 0;
+	for (bsize = sb->s_blocksize / sizeof(__be32); bsize > 0; bsize--)
+		sum += be32_to_cpu(*ptr++);
+	return sum;
+}
+
+/*
+ * Calculate the checksum of a disk block and store it
+ * at the indicated position.
+ */
+
+void
+affs_fix_checksum(struct super_block *sb, struct buffer_head *bh)
+{
+	int cnt = sb->s_blocksize / sizeof(__be32);
+	__be32 *ptr = (__be32 *)bh->b_data;
+	u32 checksum;
+	__be32 *checksumptr;
+
+	checksumptr = ptr + 5;
+	*checksumptr = 0;
+	for (checksum = 0; cnt > 0; ptr++, cnt--)
+		checksum += be32_to_cpu(*ptr);
+	*checksumptr = cpu_to_be32(-checksum);
+}
+
+void
+secs_to_datestamp(time_t secs, struct affs_date *ds)
+{
+	u32	 days;
+	u32	 minute;
+
+	secs -= sys_tz.tz_minuteswest * 60 + ((8 * 365 + 2) * 24 * 60 * 60);
+	if (secs < 0)
+		secs = 0;
+	days    = secs / 86400;
+	secs   -= days * 86400;
+	minute  = secs / 60;
+	secs   -= minute * 60;
+
+	ds->days = cpu_to_be32(days);
+	ds->mins = cpu_to_be32(minute);
+	ds->ticks = cpu_to_be32(secs * 50);
+}
+
+mode_t
+prot_to_mode(u32 prot)
+{
+	int mode = 0;
+
+	if (!(prot & FIBF_NOWRITE))
+		mode |= S_IWUSR;
+	if (!(prot & FIBF_NOREAD))
+		mode |= S_IRUSR;
+	if (!(prot & FIBF_NOEXECUTE))
+		mode |= S_IXUSR;
+	if (prot & FIBF_GRP_WRITE)
+		mode |= S_IWGRP;
+	if (prot & FIBF_GRP_READ)
+		mode |= S_IRGRP;
+	if (prot & FIBF_GRP_EXECUTE)
+		mode |= S_IXGRP;
+	if (prot & FIBF_OTR_WRITE)
+		mode |= S_IWOTH;
+	if (prot & FIBF_OTR_READ)
+		mode |= S_IROTH;
+	if (prot & FIBF_OTR_EXECUTE)
+		mode |= S_IXOTH;
+
+	return mode;
+}
+
+void
+mode_to_prot(struct inode *inode)
+{
+	u32 prot = AFFS_I(inode)->i_protect;
+	mode_t mode = inode->i_mode;
+
+	if (!(mode & S_IXUSR))
+		prot |= FIBF_NOEXECUTE;
+	if (!(mode & S_IRUSR))
+		prot |= FIBF_NOREAD;
+	if (!(mode & S_IWUSR))
+		prot |= FIBF_NOWRITE;
+	if (mode & S_IXGRP)
+		prot |= FIBF_GRP_EXECUTE;
+	if (mode & S_IRGRP)
+		prot |= FIBF_GRP_READ;
+	if (mode & S_IWGRP)
+		prot |= FIBF_GRP_WRITE;
+	if (mode & S_IXOTH)
+		prot |= FIBF_OTR_EXECUTE;
+	if (mode & S_IROTH)
+		prot |= FIBF_OTR_READ;
+	if (mode & S_IWOTH)
+		prot |= FIBF_OTR_WRITE;
+
+	AFFS_I(inode)->i_protect = prot;
+}
+
+void
+affs_error(struct super_block *sb, const char *function, const char *fmt, ...)
+{
+	va_list	 args;
+
+	va_start(args,fmt);
+	vsprintf(ErrorBuffer,fmt,args);
+	va_end(args);
+
+	printk(KERN_CRIT "AFFS error (device %s): %s(): %s\n", sb->s_id,
+		function,ErrorBuffer);
+	if (!(sb->s_flags & MS_RDONLY))
+		printk(KERN_WARNING "AFFS: Remounting filesystem read-only\n");
+	sb->s_flags |= MS_RDONLY;
+}
+
+void
+affs_warning(struct super_block *sb, const char *function, const char *fmt, ...)
+{
+	va_list	 args;
+
+	va_start(args,fmt);
+	vsprintf(ErrorBuffer,fmt,args);
+	va_end(args);
+
+	printk(KERN_WARNING "AFFS warning (device %s): %s(): %s\n", sb->s_id,
+		function,ErrorBuffer);
+}
+
+/* Check if the name is valid for a affs object. */
+
+int
+affs_check_name(const unsigned char *name, int len)
+{
+	int	 i;
+
+	if (len > 30)
+#ifdef AFFS_NO_TRUNCATE
+		return -ENAMETOOLONG;
+#else
+		len = 30;
+#endif
+
+	for (i = 0; i < len; i++) {
+		if (name[i] < ' ' || name[i] == ':'
+		    || (name[i] > 0x7e && name[i] < 0xa0))
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
+/* This function copies name to bstr, with at most 30
+ * characters length. The bstr will be prepended by
+ * a length byte.
+ * NOTE: The name will must be already checked by
+ *       affs_check_name()!
+ */
+
+int
+affs_copy_name(unsigned char *bstr, struct dentry *dentry)
+{
+	int len = min(dentry->d_name.len, 30u);
+
+	*bstr++ = len;
+	memcpy(bstr, dentry->d_name.name, len);
+	return len;
+}