1 files changed, 411 insertions, 0 deletions

diff --git a/fs/affs/inode.c b/fs/affs/inode.c
new file mode 100644
index 000000000000..7aa6f2004536
--- /dev/null
+++ b/fs/affs/inode.c
@@ -0,0 +1,411 @@
+/*
+ *  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 ISO9660 filesystem.
+ *
+ *  (C) 1991  Linus Torvalds - minix filesystem
+ */
+
+#include "affs.h"
+
+extern struct inode_operations affs_symlink_inode_operations;
+extern struct timezone sys_tz;
+
+void
+affs_read_inode(struct inode *inode)
+{
+	struct super_block	*sb = inode->i_sb;
+	struct affs_sb_info	*sbi = AFFS_SB(sb);
+	struct buffer_head	*bh;
+	struct affs_head	*head;
+	struct affs_tail	*tail;
+	u32			 block;
+	u32			 size;
+	u32			 prot;
+	u16			 id;
+
+	pr_debug("AFFS: read_inode(%lu)\n",inode->i_ino);
+
+	block = inode->i_ino;
+	bh = affs_bread(sb, block);
+	if (!bh) {
+		affs_warning(sb, "read_inode", "Cannot read block %d", block);
+		goto bad_inode;
+	}
+	if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
+		affs_warning(sb,"read_inode",
+			   "Checksum or type (ptype=%d) error on inode %d",
+			   AFFS_HEAD(bh)->ptype, block);
+		goto bad_inode;
+	}
+
+	head = AFFS_HEAD(bh);
+	tail = AFFS_TAIL(sb, bh);
+	prot = be32_to_cpu(tail->protect);
+
+	inode->i_size = 0;
+	inode->i_nlink = 1;
+	inode->i_mode = 0;
+	AFFS_I(inode)->i_extcnt = 1;
+	AFFS_I(inode)->i_ext_last = ~1;
+	AFFS_I(inode)->i_protect = prot;
+	AFFS_I(inode)->i_opencnt = 0;
+	AFFS_I(inode)->i_blkcnt = 0;
+	AFFS_I(inode)->i_lc = NULL;
+	AFFS_I(inode)->i_lc_size = 0;
+	AFFS_I(inode)->i_lc_shift = 0;
+	AFFS_I(inode)->i_lc_mask = 0;
+	AFFS_I(inode)->i_ac = NULL;
+	AFFS_I(inode)->i_ext_bh = NULL;
+	AFFS_I(inode)->mmu_private = 0;
+	AFFS_I(inode)->i_lastalloc = 0;
+	AFFS_I(inode)->i_pa_cnt = 0;
+
+	if (sbi->s_flags & SF_SETMODE)
+		inode->i_mode = sbi->s_mode;
+	else
+		inode->i_mode = prot_to_mode(prot);
+
+	id = be16_to_cpu(tail->uid);
+	if (id == 0 || sbi->s_flags & SF_SETUID)
+		inode->i_uid = sbi->s_uid;
+	else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
+		inode->i_uid = 0;
+	else
+		inode->i_uid = id;
+
+	id = be16_to_cpu(tail->gid);
+	if (id == 0 || sbi->s_flags & SF_SETGID)
+		inode->i_gid = sbi->s_gid;
+	else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
+		inode->i_gid = 0;
+	else
+		inode->i_gid = id;
+
+	switch (be32_to_cpu(tail->stype)) {
+	case ST_ROOT:
+		inode->i_uid = sbi->s_uid;
+		inode->i_gid = sbi->s_gid;
+		/* fall through */
+	case ST_USERDIR:
+		if (be32_to_cpu(tail->stype) == ST_USERDIR ||
+		    sbi->s_flags & SF_SETMODE) {
+			if (inode->i_mode & S_IRUSR)
+				inode->i_mode |= S_IXUSR;
+			if (inode->i_mode & S_IRGRP)
+				inode->i_mode |= S_IXGRP;
+			if (inode->i_mode & S_IROTH)
+				inode->i_mode |= S_IXOTH;
+			inode->i_mode |= S_IFDIR;
+		} else
+			inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
+		if (tail->link_chain)
+			inode->i_nlink = 2;
+		/* Maybe it should be controlled by mount parameter? */
+		//inode->i_mode |= S_ISVTX;
+		inode->i_op = &affs_dir_inode_operations;
+		inode->i_fop = &affs_dir_operations;
+		break;
+	case ST_LINKDIR:
+#if 0
+		affs_warning(sb, "read_inode", "inode is LINKDIR");
+		goto bad_inode;
+#else
+		inode->i_mode |= S_IFDIR;
+		inode->i_op = NULL;
+		inode->i_fop = NULL;
+		break;
+#endif
+	case ST_LINKFILE:
+		affs_warning(sb, "read_inode", "inode is LINKFILE");
+		goto bad_inode;
+	case ST_FILE:
+		size = be32_to_cpu(tail->size);
+		inode->i_mode |= S_IFREG;
+		AFFS_I(inode)->mmu_private = inode->i_size = size;
+		if (inode->i_size) {
+			AFFS_I(inode)->i_blkcnt = (size - 1) /
+					       sbi->s_data_blksize + 1;
+			AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /
+					       sbi->s_hashsize + 1;
+		}
+		if (tail->link_chain)
+			inode->i_nlink = 2;
+		inode->i_mapping->a_ops = (sbi->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
+		inode->i_op = &affs_file_inode_operations;
+		inode->i_fop = &affs_file_operations;
+		break;
+	case ST_SOFTLINK:
+		inode->i_mode |= S_IFLNK;
+		inode->i_op = &affs_symlink_inode_operations;
+		inode->i_data.a_ops = &affs_symlink_aops;
+		break;
+	}
+
+	inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec
+		       = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
+		         be32_to_cpu(tail->change.mins) * 60 +
+			 be32_to_cpu(tail->change.ticks) / 50 +
+			 ((8 * 365 + 2) * 24 * 60 * 60)) +
+			 sys_tz.tz_minuteswest * 60;
+	inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0;
+	affs_brelse(bh);
+	return;
+
+bad_inode:
+	make_bad_inode(inode);
+	affs_brelse(bh);
+	return;
+}
+
+int
+affs_write_inode(struct inode *inode, int unused)
+{
+	struct super_block	*sb = inode->i_sb;
+	struct buffer_head	*bh;
+	struct affs_tail	*tail;
+	uid_t			 uid;
+	gid_t			 gid;
+
+	pr_debug("AFFS: write_inode(%lu)\n",inode->i_ino);
+
+	if (!inode->i_nlink)
+		// possibly free block
+		return 0;
+	bh = affs_bread(sb, inode->i_ino);
+	if (!bh) {
+		affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
+		return -EIO;
+	}
+	tail = AFFS_TAIL(sb, bh);
+	if (tail->stype == cpu_to_be32(ST_ROOT)) {
+		secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change);
+	} else {
+		tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
+		tail->size = cpu_to_be32(inode->i_size);
+		secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change);
+		if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
+			uid = inode->i_uid;
+			gid = inode->i_gid;
+			if (AFFS_SB(sb)->s_flags & SF_MUFS) {
+				if (inode->i_uid == 0 || inode->i_uid == 0xFFFF)
+					uid = inode->i_uid ^ ~0;
+				if (inode->i_gid == 0 || inode->i_gid == 0xFFFF)
+					gid = inode->i_gid ^ ~0;
+			}
+			if (!(AFFS_SB(sb)->s_flags & SF_SETUID))
+				tail->uid = cpu_to_be16(uid);
+			if (!(AFFS_SB(sb)->s_flags & SF_SETGID))
+				tail->gid = cpu_to_be16(gid);
+		}
+	}
+	affs_fix_checksum(sb, bh);
+	mark_buffer_dirty_inode(bh, inode);
+	affs_brelse(bh);
+	affs_free_prealloc(inode);
+	return 0;
+}
+
+int
+affs_notify_change(struct dentry *dentry, struct iattr *attr)
+{
+	struct inode *inode = dentry->d_inode;
+	int error;
+
+	pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid);
+
+	error = inode_change_ok(inode,attr);
+	if (error)
+		goto out;
+
+	if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) ||
+	    ((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) ||
+	    ((attr->ia_valid & ATTR_MODE) &&
+	     (AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) {
+		if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET))
+			error = -EPERM;
+		goto out;
+	}
+
+	error = inode_setattr(inode, attr);
+	if (!error && (attr->ia_valid & ATTR_MODE))
+		mode_to_prot(inode);
+out:
+	return error;
+}
+
+void
+affs_put_inode(struct inode *inode)
+{
+	pr_debug("AFFS: put_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
+	affs_free_prealloc(inode);
+	if (atomic_read(&inode->i_count) == 1) {
+		down(&inode->i_sem);
+		if (inode->i_size != AFFS_I(inode)->mmu_private)
+			affs_truncate(inode);
+		up(&inode->i_sem);
+	}
+}
+
+void
+affs_delete_inode(struct inode *inode)
+{
+	pr_debug("AFFS: delete_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
+	inode->i_size = 0;
+	if (S_ISREG(inode->i_mode))
+		affs_truncate(inode);
+	clear_inode(inode);
+	affs_free_block(inode->i_sb, inode->i_ino);
+}
+
+void
+affs_clear_inode(struct inode *inode)
+{
+	unsigned long cache_page = (unsigned long) AFFS_I(inode)->i_lc;
+
+	pr_debug("AFFS: clear_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
+	if (cache_page) {
+		pr_debug("AFFS: freeing ext cache\n");
+		AFFS_I(inode)->i_lc = NULL;
+		AFFS_I(inode)->i_ac = NULL;
+		free_page(cache_page);
+	}
+	affs_brelse(AFFS_I(inode)->i_ext_bh);
+	AFFS_I(inode)->i_ext_last = ~1;
+	AFFS_I(inode)->i_ext_bh = NULL;
+}
+
+struct inode *
+affs_new_inode(struct inode *dir)
+{
+	struct super_block	*sb = dir->i_sb;
+	struct inode		*inode;
+	u32			 block;
+	struct buffer_head	*bh;
+
+	if (!(inode = new_inode(sb)))
+		goto err_inode;
+
+	if (!(block = affs_alloc_block(dir, dir->i_ino)))
+		goto err_block;
+
+	bh = affs_getzeroblk(sb, block);
+	if (!bh)
+		goto err_bh;
+	mark_buffer_dirty_inode(bh, inode);
+	affs_brelse(bh);
+
+	inode->i_uid     = current->fsuid;
+	inode->i_gid     = current->fsgid;
+	inode->i_ino     = block;
+	inode->i_nlink   = 1;
+	inode->i_mtime   = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
+	AFFS_I(inode)->i_opencnt = 0;
+	AFFS_I(inode)->i_blkcnt = 0;
+	AFFS_I(inode)->i_lc = NULL;
+	AFFS_I(inode)->i_lc_size = 0;
+	AFFS_I(inode)->i_lc_shift = 0;
+	AFFS_I(inode)->i_lc_mask = 0;
+	AFFS_I(inode)->i_ac = NULL;
+	AFFS_I(inode)->i_ext_bh = NULL;
+	AFFS_I(inode)->mmu_private = 0;
+	AFFS_I(inode)->i_protect = 0;
+	AFFS_I(inode)->i_lastalloc = 0;
+	AFFS_I(inode)->i_pa_cnt = 0;
+	AFFS_I(inode)->i_extcnt = 1;
+	AFFS_I(inode)->i_ext_last = ~1;
+
+	insert_inode_hash(inode);
+
+	return inode;
+
+err_bh:
+	affs_free_block(sb, block);
+err_block:
+	iput(inode);
+err_inode:
+	return NULL;
+}
+
+/*
+ * Add an entry to a directory. Create the header block
+ * and insert it into the hash table.
+ */
+
+int
+affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
+{
+	struct super_block *sb = dir->i_sb;
+	struct buffer_head *inode_bh = NULL;
+	struct buffer_head *bh = NULL;
+	u32 block = 0;
+	int retval;
+
+	pr_debug("AFFS: add_entry(dir=%u, inode=%u, \"%*s\", type=%d)\n", (u32)dir->i_ino,
+	         (u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type);
+
+	retval = -EIO;
+	bh = affs_bread(sb, inode->i_ino);
+	if (!bh)
+		goto done;
+
+	affs_lock_link(inode);
+	switch (type) {
+	case ST_LINKFILE:
+	case ST_LINKDIR:
+		inode_bh = bh;
+		retval = -ENOSPC;
+		block = affs_alloc_block(dir, dir->i_ino);
+		if (!block)
+			goto err;
+		retval = -EIO;
+		bh = affs_getzeroblk(sb, block);
+		if (!bh)
+			goto err;
+		break;
+	default:
+		break;
+	}
+
+	AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
+	AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
+	affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
+	AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
+	AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
+
+	if (inode_bh) {
+		__be32 chain;
+	       	chain = AFFS_TAIL(sb, inode_bh)->link_chain;
+		AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
+		AFFS_TAIL(sb, bh)->link_chain = chain;
+		AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
+		affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
+		mark_buffer_dirty_inode(inode_bh, inode);
+		inode->i_nlink = 2;
+		atomic_inc(&inode->i_count);
+	}
+	affs_fix_checksum(sb, bh);
+	mark_buffer_dirty_inode(bh, inode);
+	dentry->d_fsdata = (void *)(long)bh->b_blocknr;
+
+	affs_lock_dir(dir);
+	retval = affs_insert_hash(dir, bh);
+	mark_buffer_dirty_inode(bh, inode);
+	affs_unlock_dir(dir);
+	affs_unlock_link(inode);
+
+	d_instantiate(dentry, inode);
+done:
+	affs_brelse(inode_bh);
+	affs_brelse(bh);
+	return retval;
+err:
+	if (block)
+		affs_free_block(sb, block);
+	affs_unlock_link(inode);
+	goto done;
+}