1 files changed, 421 insertions, 0 deletions

diff --git a/fs/affs/inode.c b/fs/affs/inode.c
new file mode 100644
index 000000000..73598bff8
--- /dev/null
+++ b/fs/affs/inode.c
@@ -0,0 +1,421 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  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 <linux/sched.h>
+#include <linux/cred.h>
+#include <linux/gfp.h>
+#include "affs.h"
+
+struct inode *affs_iget(struct super_block *sb, unsigned long ino)
+{
+	struct affs_sb_info	*sbi = AFFS_SB(sb);
+	struct buffer_head	*bh;
+	struct affs_tail	*tail;
+	struct inode		*inode;
+	u32			 block;
+	u32			 size;
+	u32			 prot;
+	u16			 id;
+
+	inode = iget_locked(sb, ino);
+	if (!inode)
+		return ERR_PTR(-ENOMEM);
+	if (!(inode->i_state & I_NEW))
+		return inode;
+
+	pr_debug("affs_iget(%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;
+	}
+
+	tail = AFFS_TAIL(sb, bh);
+	prot = be32_to_cpu(tail->protect);
+
+	inode->i_size = 0;
+	set_nlink(inode, 1);
+	inode->i_mode = 0;
+	AFFS_I(inode)->i_extcnt = 1;
+	AFFS_I(inode)->i_ext_last = ~1;
+	AFFS_I(inode)->i_protect = prot;
+	atomic_set(&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 (affs_test_opt(sbi->s_flags, SF_SETMODE))
+		inode->i_mode = sbi->s_mode;
+	else
+		inode->i_mode = affs_prot_to_mode(prot);
+
+	id = be16_to_cpu(tail->uid);
+	if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETUID))
+		inode->i_uid = sbi->s_uid;
+	else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS))
+		i_uid_write(inode, 0);
+	else
+		i_uid_write(inode, id);
+
+	id = be16_to_cpu(tail->gid);
+	if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETGID))
+		inode->i_gid = sbi->s_gid;
+	else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS))
+		i_gid_write(inode, 0);
+	else
+		i_gid_write(inode, 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 ||
+		    affs_test_opt(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;
+		/* 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;
+		/* ... and leave ->i_op and ->i_fop pointing to empty */
+		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)
+			set_nlink(inode, 2);
+		inode->i_mapping->a_ops = affs_test_opt(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_size = strlen((char *)AFFS_HEAD(bh)->table);
+		inode->i_mode |= S_IFLNK;
+		inode_nohighmem(inode);
+		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);
+	unlock_new_inode(inode);
+	return inode;
+
+bad_inode:
+	affs_brelse(bh);
+	iget_failed(inode);
+	return ERR_PTR(-EIO);
+}
+
+int
+affs_write_inode(struct inode *inode, struct writeback_control *wbc)
+{
+	struct super_block	*sb = inode->i_sb;
+	struct buffer_head	*bh;
+	struct affs_tail	*tail;
+	uid_t			 uid;
+	gid_t			 gid;
+
+	pr_debug("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)) {
+		affs_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);
+		affs_secs_to_datestamp(inode->i_mtime.tv_sec, &tail->change);
+		if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
+			uid = i_uid_read(inode);
+			gid = i_gid_read(inode);
+			if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_MUFS)) {
+				if (uid == 0 || uid == 0xFFFF)
+					uid = uid ^ ~0;
+				if (gid == 0 || gid == 0xFFFF)
+					gid = gid ^ ~0;
+			}
+			if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETUID))
+				tail->uid = cpu_to_be16(uid);
+			if (!affs_test_opt(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 = d_inode(dentry);
+	int error;
+
+	pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid);
+
+	error = setattr_prepare(dentry, attr);
+	if (error)
+		goto out;
+
+	if (((attr->ia_valid & ATTR_UID) &&
+	      affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETUID)) ||
+	    ((attr->ia_valid & ATTR_GID) &&
+	      affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETGID)) ||
+	    ((attr->ia_valid & ATTR_MODE) &&
+	     (AFFS_SB(inode->i_sb)->s_flags &
+	      (AFFS_MOUNT_SF_SETMODE | AFFS_MOUNT_SF_IMMUTABLE)))) {
+		if (!affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_QUIET))
+			error = -EPERM;
+		goto out;
+	}
+
+	if ((attr->ia_valid & ATTR_SIZE) &&
+	    attr->ia_size != i_size_read(inode)) {
+		error = inode_newsize_ok(inode, attr->ia_size);
+		if (error)
+			return error;
+
+		truncate_setsize(inode, attr->ia_size);
+		affs_truncate(inode);
+	}
+
+	setattr_copy(inode, attr);
+	mark_inode_dirty(inode);
+
+	if (attr->ia_valid & ATTR_MODE)
+		affs_mode_to_prot(inode);
+out:
+	return error;
+}
+
+void
+affs_evict_inode(struct inode *inode)
+{
+	unsigned long cache_page;
+	pr_debug("evict_inode(ino=%lu, nlink=%u)\n",
+		 inode->i_ino, inode->i_nlink);
+	truncate_inode_pages_final(&inode->i_data);
+
+	if (!inode->i_nlink) {
+		inode->i_size = 0;
+		affs_truncate(inode);
+	}
+
+	invalidate_inode_buffers(inode);
+	clear_inode(inode);
+	affs_free_prealloc(inode);
+	cache_page = (unsigned long)AFFS_I(inode)->i_lc;
+	if (cache_page) {
+		pr_debug("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;
+
+	if (!inode->i_nlink)
+		affs_free_block(inode->i_sb, inode->i_ino);
+}
+
+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;
+	set_nlink(inode, 1);
+	inode->i_mtime   = inode->i_atime = inode->i_ctime = current_time(inode);
+	atomic_set(&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;
+	u32 block = 0;
+	int retval;
+
+	pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__,
+		 dir->i_ino, inode->i_ino, dentry, 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:
+		retval = -ENOSPC;
+		block = affs_alloc_block(dir, dir->i_ino);
+		if (!block)
+			goto err;
+		retval = -EIO;
+		inode_bh = bh;
+		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);
+		set_nlink(inode, 2);
+		ihold(inode);
+	}
+	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;
+}