Initial import

1 files changed, 628 insertions, 0 deletions

diff --git a/fs/hpfs/namei.c b/fs/hpfs/namei.c
new file mode 100644
index 000000000..a0872f239
--- /dev/null
+++ b/fs/hpfs/namei.c
@@ -0,0 +1,628 @@
+/*
+ *  linux/fs/hpfs/namei.c
+ *
+ *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
+ *
+ *  adding & removing files & directories
+ */
+#include <linux/sched.h>
+#include "hpfs_fn.h"
+
+static int hpfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+	const unsigned char *name = dentry->d_name.name;
+	unsigned len = dentry->d_name.len;
+	struct quad_buffer_head qbh0;
+	struct buffer_head *bh;
+	struct hpfs_dirent *de;
+	struct fnode *fnode;
+	struct dnode *dnode;
+	struct inode *result;
+	fnode_secno fno;
+	dnode_secno dno;
+	int r;
+	struct hpfs_dirent dee;
+	int err;
+	if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
+	hpfs_lock(dir->i_sb);
+	err = -ENOSPC;
+	fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
+	if (!fnode)
+		goto bail;
+	dnode = hpfs_alloc_dnode(dir->i_sb, fno, &dno, &qbh0);
+	if (!dnode)
+		goto bail1;
+	memset(&dee, 0, sizeof dee);
+	dee.directory = 1;
+	if (!(mode & 0222)) dee.read_only = 1;
+	/*dee.archive = 0;*/
+	dee.hidden = name[0] == '.';
+	dee.fnode = cpu_to_le32(fno);
+	dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds()));
+	result = new_inode(dir->i_sb);
+	if (!result)
+		goto bail2;
+	hpfs_init_inode(result);
+	result->i_ino = fno;
+	hpfs_i(result)->i_parent_dir = dir->i_ino;
+	hpfs_i(result)->i_dno = dno;
+	result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date));
+	result->i_ctime.tv_nsec = 0; 
+	result->i_mtime.tv_nsec = 0; 
+	result->i_atime.tv_nsec = 0; 
+	hpfs_i(result)->i_ea_size = 0;
+	result->i_mode |= S_IFDIR;
+	result->i_op = &hpfs_dir_iops;
+	result->i_fop = &hpfs_dir_ops;
+	result->i_blocks = 4;
+	result->i_size = 2048;
+	set_nlink(result, 2);
+	if (dee.read_only)
+		result->i_mode &= ~0222;
+
+	r = hpfs_add_dirent(dir, name, len, &dee);
+	if (r == 1)
+		goto bail3;
+	if (r == -1) {
+		err = -EEXIST;
+		goto bail3;
+	}
+	fnode->len = len;
+	memcpy(fnode->name, name, len > 15 ? 15 : len);
+	fnode->up = cpu_to_le32(dir->i_ino);
+	fnode->flags |= FNODE_dir;
+	fnode->btree.n_free_nodes = 7;
+	fnode->btree.n_used_nodes = 1;
+	fnode->btree.first_free = cpu_to_le16(0x14);
+	fnode->u.external[0].disk_secno = cpu_to_le32(dno);
+	fnode->u.external[0].file_secno = cpu_to_le32(-1);
+	dnode->root_dnode = 1;
+	dnode->up = cpu_to_le32(fno);
+	de = hpfs_add_de(dir->i_sb, dnode, "\001\001", 2, 0);
+	de->creation_date = de->write_date = de->read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds()));
+	if (!(mode & 0222)) de->read_only = 1;
+	de->first = de->directory = 1;
+	/*de->hidden = de->system = 0;*/
+	de->fnode = cpu_to_le32(fno);
+	mark_buffer_dirty(bh);
+	brelse(bh);
+	hpfs_mark_4buffers_dirty(&qbh0);
+	hpfs_brelse4(&qbh0);
+	inc_nlink(dir);
+	insert_inode_hash(result);
+
+	if (!uid_eq(result->i_uid, current_fsuid()) ||
+	    !gid_eq(result->i_gid, current_fsgid()) ||
+	    result->i_mode != (mode | S_IFDIR)) {
+		result->i_uid = current_fsuid();
+		result->i_gid = current_fsgid();
+		result->i_mode = mode | S_IFDIR;
+		hpfs_write_inode_nolock(result);
+	}
+	d_instantiate(dentry, result);
+	hpfs_unlock(dir->i_sb);
+	return 0;
+bail3:
+	iput(result);
+bail2:
+	hpfs_brelse4(&qbh0);
+	hpfs_free_dnode(dir->i_sb, dno);
+bail1:
+	brelse(bh);
+	hpfs_free_sectors(dir->i_sb, fno, 1);
+bail:
+	hpfs_unlock(dir->i_sb);
+	return err;
+}
+
+static int hpfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl)
+{
+	const unsigned char *name = dentry->d_name.name;
+	unsigned len = dentry->d_name.len;
+	struct inode *result = NULL;
+	struct buffer_head *bh;
+	struct fnode *fnode;
+	fnode_secno fno;
+	int r;
+	struct hpfs_dirent dee;
+	int err;
+	if ((err = hpfs_chk_name(name, &len)))
+		return err==-ENOENT ? -EINVAL : err;
+	hpfs_lock(dir->i_sb);
+	err = -ENOSPC;
+	fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
+	if (!fnode)
+		goto bail;
+	memset(&dee, 0, sizeof dee);
+	if (!(mode & 0222)) dee.read_only = 1;
+	dee.archive = 1;
+	dee.hidden = name[0] == '.';
+	dee.fnode = cpu_to_le32(fno);
+	dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds()));
+
+	result = new_inode(dir->i_sb);
+	if (!result)
+		goto bail1;
+	
+	hpfs_init_inode(result);
+	result->i_ino = fno;
+	result->i_mode |= S_IFREG;
+	result->i_mode &= ~0111;
+	result->i_op = &hpfs_file_iops;
+	result->i_fop = &hpfs_file_ops;
+	set_nlink(result, 1);
+	hpfs_i(result)->i_parent_dir = dir->i_ino;
+	result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date));
+	result->i_ctime.tv_nsec = 0;
+	result->i_mtime.tv_nsec = 0;
+	result->i_atime.tv_nsec = 0;
+	hpfs_i(result)->i_ea_size = 0;
+	if (dee.read_only)
+		result->i_mode &= ~0222;
+	result->i_blocks = 1;
+	result->i_size = 0;
+	result->i_data.a_ops = &hpfs_aops;
+	hpfs_i(result)->mmu_private = 0;
+
+	r = hpfs_add_dirent(dir, name, len, &dee);
+	if (r == 1)
+		goto bail2;
+	if (r == -1) {
+		err = -EEXIST;
+		goto bail2;
+	}
+	fnode->len = len;
+	memcpy(fnode->name, name, len > 15 ? 15 : len);
+	fnode->up = cpu_to_le32(dir->i_ino);
+	mark_buffer_dirty(bh);
+	brelse(bh);
+
+	insert_inode_hash(result);
+
+	if (!uid_eq(result->i_uid, current_fsuid()) ||
+	    !gid_eq(result->i_gid, current_fsgid()) ||
+	    result->i_mode != (mode | S_IFREG)) {
+		result->i_uid = current_fsuid();
+		result->i_gid = current_fsgid();
+		result->i_mode = mode | S_IFREG;
+		hpfs_write_inode_nolock(result);
+	}
+	d_instantiate(dentry, result);
+	hpfs_unlock(dir->i_sb);
+	return 0;
+
+bail2:
+	iput(result);
+bail1:
+	brelse(bh);
+	hpfs_free_sectors(dir->i_sb, fno, 1);
+bail:
+	hpfs_unlock(dir->i_sb);
+	return err;
+}
+
+static int hpfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
+{
+	const unsigned char *name = dentry->d_name.name;
+	unsigned len = dentry->d_name.len;
+	struct buffer_head *bh;
+	struct fnode *fnode;
+	fnode_secno fno;
+	int r;
+	struct hpfs_dirent dee;
+	struct inode *result = NULL;
+	int err;
+	if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
+	if (hpfs_sb(dir->i_sb)->sb_eas < 2) return -EPERM;
+	if (!new_valid_dev(rdev))
+		return -EINVAL;
+	hpfs_lock(dir->i_sb);
+	err = -ENOSPC;
+	fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
+	if (!fnode)
+		goto bail;
+	memset(&dee, 0, sizeof dee);
+	if (!(mode & 0222)) dee.read_only = 1;
+	dee.archive = 1;
+	dee.hidden = name[0] == '.';
+	dee.fnode = cpu_to_le32(fno);
+	dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds()));
+
+	result = new_inode(dir->i_sb);
+	if (!result)
+		goto bail1;
+
+	hpfs_init_inode(result);
+	result->i_ino = fno;
+	hpfs_i(result)->i_parent_dir = dir->i_ino;
+	result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date));
+	result->i_ctime.tv_nsec = 0;
+	result->i_mtime.tv_nsec = 0;
+	result->i_atime.tv_nsec = 0;
+	hpfs_i(result)->i_ea_size = 0;
+	result->i_uid = current_fsuid();
+	result->i_gid = current_fsgid();
+	set_nlink(result, 1);
+	result->i_size = 0;
+	result->i_blocks = 1;
+	init_special_inode(result, mode, rdev);
+
+	r = hpfs_add_dirent(dir, name, len, &dee);
+	if (r == 1)
+		goto bail2;
+	if (r == -1) {
+		err = -EEXIST;
+		goto bail2;
+	}
+	fnode->len = len;
+	memcpy(fnode->name, name, len > 15 ? 15 : len);
+	fnode->up = cpu_to_le32(dir->i_ino);
+	mark_buffer_dirty(bh);
+
+	insert_inode_hash(result);
+
+	hpfs_write_inode_nolock(result);
+	d_instantiate(dentry, result);
+	brelse(bh);
+	hpfs_unlock(dir->i_sb);
+	return 0;
+bail2:
+	iput(result);
+bail1:
+	brelse(bh);
+	hpfs_free_sectors(dir->i_sb, fno, 1);
+bail:
+	hpfs_unlock(dir->i_sb);
+	return err;
+}
+
+static int hpfs_symlink(struct inode *dir, struct dentry *dentry, const char *symlink)
+{
+	const unsigned char *name = dentry->d_name.name;
+	unsigned len = dentry->d_name.len;
+	struct buffer_head *bh;
+	struct fnode *fnode;
+	fnode_secno fno;
+	int r;
+	struct hpfs_dirent dee;
+	struct inode *result;
+	int err;
+	if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
+	hpfs_lock(dir->i_sb);
+	if (hpfs_sb(dir->i_sb)->sb_eas < 2) {
+		hpfs_unlock(dir->i_sb);
+		return -EPERM;
+	}
+	err = -ENOSPC;
+	fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
+	if (!fnode)
+		goto bail;
+	memset(&dee, 0, sizeof dee);
+	dee.archive = 1;
+	dee.hidden = name[0] == '.';
+	dee.fnode = cpu_to_le32(fno);
+	dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds()));
+
+	result = new_inode(dir->i_sb);
+	if (!result)
+		goto bail1;
+	result->i_ino = fno;
+	hpfs_init_inode(result);
+	hpfs_i(result)->i_parent_dir = dir->i_ino;
+	result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date));
+	result->i_ctime.tv_nsec = 0;
+	result->i_mtime.tv_nsec = 0;
+	result->i_atime.tv_nsec = 0;
+	hpfs_i(result)->i_ea_size = 0;
+	result->i_mode = S_IFLNK | 0777;
+	result->i_uid = current_fsuid();
+	result->i_gid = current_fsgid();
+	result->i_blocks = 1;
+	set_nlink(result, 1);
+	result->i_size = strlen(symlink);
+	result->i_op = &page_symlink_inode_operations;
+	result->i_data.a_ops = &hpfs_symlink_aops;
+
+	r = hpfs_add_dirent(dir, name, len, &dee);
+	if (r == 1)
+		goto bail2;
+	if (r == -1) {
+		err = -EEXIST;
+		goto bail2;
+	}
+	fnode->len = len;
+	memcpy(fnode->name, name, len > 15 ? 15 : len);
+	fnode->up = cpu_to_le32(dir->i_ino);
+	hpfs_set_ea(result, fnode, "SYMLINK", symlink, strlen(symlink));
+	mark_buffer_dirty(bh);
+	brelse(bh);
+
+	insert_inode_hash(result);
+
+	hpfs_write_inode_nolock(result);
+	d_instantiate(dentry, result);
+	hpfs_unlock(dir->i_sb);
+	return 0;
+bail2:
+	iput(result);
+bail1:
+	brelse(bh);
+	hpfs_free_sectors(dir->i_sb, fno, 1);
+bail:
+	hpfs_unlock(dir->i_sb);
+	return err;
+}
+
+static int hpfs_unlink(struct inode *dir, struct dentry *dentry)
+{
+	const unsigned char *name = dentry->d_name.name;
+	unsigned len = dentry->d_name.len;
+	struct quad_buffer_head qbh;
+	struct hpfs_dirent *de;
+	struct inode *inode = d_inode(dentry);
+	dnode_secno dno;
+	int r;
+	int rep = 0;
+	int err;
+
+	hpfs_lock(dir->i_sb);
+	hpfs_adjust_length(name, &len);
+again:
+	err = -ENOENT;
+	de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, &dno, &qbh);
+	if (!de)
+		goto out;
+
+	err = -EPERM;
+	if (de->first)
+		goto out1;
+
+	err = -EISDIR;
+	if (de->directory)
+		goto out1;
+
+	r = hpfs_remove_dirent(dir, dno, de, &qbh, 1);
+	switch (r) {
+	case 1:
+		hpfs_error(dir->i_sb, "there was error when removing dirent");
+		err = -EFSERROR;
+		break;
+	case 2:		/* no space for deleting, try to truncate file */
+
+		err = -ENOSPC;
+		if (rep++)
+			break;
+
+		dentry_unhash(dentry);
+		if (!d_unhashed(dentry)) {
+			hpfs_unlock(dir->i_sb);
+			return -ENOSPC;
+		}
+		if (generic_permission(inode, MAY_WRITE) ||
+		    !S_ISREG(inode->i_mode) ||
+		    get_write_access(inode)) {
+			d_rehash(dentry);
+		} else {
+			struct iattr newattrs;
+			/*pr_info("truncating file before delete.\n");*/
+			newattrs.ia_size = 0;
+			newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
+			err = notify_change(dentry, &newattrs, NULL);
+			put_write_access(inode);
+			if (!err)
+				goto again;
+		}
+		hpfs_unlock(dir->i_sb);
+		return -ENOSPC;
+	default:
+		drop_nlink(inode);
+		err = 0;
+	}
+	goto out;
+
+out1:
+	hpfs_brelse4(&qbh);
+out:
+	hpfs_unlock(dir->i_sb);
+	return err;
+}
+
+static int hpfs_rmdir(struct inode *dir, struct dentry *dentry)
+{
+	const unsigned char *name = dentry->d_name.name;
+	unsigned len = dentry->d_name.len;
+	struct quad_buffer_head qbh;
+	struct hpfs_dirent *de;
+	struct inode *inode = d_inode(dentry);
+	dnode_secno dno;
+	int n_items = 0;
+	int err;
+	int r;
+
+	hpfs_adjust_length(name, &len);
+	hpfs_lock(dir->i_sb);
+	err = -ENOENT;
+	de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, &dno, &qbh);
+	if (!de)
+		goto out;
+
+	err = -EPERM;
+	if (de->first)
+		goto out1;
+
+	err = -ENOTDIR;
+	if (!de->directory)
+		goto out1;
+
+	hpfs_count_dnodes(dir->i_sb, hpfs_i(inode)->i_dno, NULL, NULL, &n_items);
+	err = -ENOTEMPTY;
+	if (n_items)
+		goto out1;
+
+	r = hpfs_remove_dirent(dir, dno, de, &qbh, 1);
+	switch (r) {
+	case 1:
+		hpfs_error(dir->i_sb, "there was error when removing dirent");
+		err = -EFSERROR;
+		break;
+	case 2:
+		err = -ENOSPC;
+		break;
+	default:
+		drop_nlink(dir);
+		clear_nlink(inode);
+		err = 0;
+	}
+	goto out;
+out1:
+	hpfs_brelse4(&qbh);
+out:
+	hpfs_unlock(dir->i_sb);
+	return err;
+}
+
+static int hpfs_symlink_readpage(struct file *file, struct page *page)
+{
+	char *link = kmap(page);
+	struct inode *i = page->mapping->host;
+	struct fnode *fnode;
+	struct buffer_head *bh;
+	int err;
+
+	err = -EIO;
+	hpfs_lock(i->i_sb);
+	if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh)))
+		goto fail;
+	err = hpfs_read_ea(i->i_sb, fnode, "SYMLINK", link, PAGE_SIZE);
+	brelse(bh);
+	if (err)
+		goto fail;
+	hpfs_unlock(i->i_sb);
+	SetPageUptodate(page);
+	kunmap(page);
+	unlock_page(page);
+	return 0;
+
+fail:
+	hpfs_unlock(i->i_sb);
+	SetPageError(page);
+	kunmap(page);
+	unlock_page(page);
+	return err;
+}
+
+const struct address_space_operations hpfs_symlink_aops = {
+	.readpage	= hpfs_symlink_readpage
+};
+	
+static int hpfs_rename(struct inode *old_dir, struct dentry *old_dentry,
+		struct inode *new_dir, struct dentry *new_dentry)
+{
+	const unsigned char *old_name = old_dentry->d_name.name;
+	unsigned old_len = old_dentry->d_name.len;
+	const unsigned char *new_name = new_dentry->d_name.name;
+	unsigned new_len = new_dentry->d_name.len;
+	struct inode *i = d_inode(old_dentry);
+	struct inode *new_inode = d_inode(new_dentry);
+	struct quad_buffer_head qbh, qbh1;
+	struct hpfs_dirent *dep, *nde;
+	struct hpfs_dirent de;
+	dnode_secno dno;
+	int r;
+	struct buffer_head *bh;
+	struct fnode *fnode;
+	int err;
+
+	if ((err = hpfs_chk_name(new_name, &new_len))) return err;
+	err = 0;
+	hpfs_adjust_length(old_name, &old_len);
+
+	hpfs_lock(i->i_sb);
+	/* order doesn't matter, due to VFS exclusion */
+	
+	/* Erm? Moving over the empty non-busy directory is perfectly legal */
+	if (new_inode && S_ISDIR(new_inode->i_mode)) {
+		err = -EINVAL;
+		goto end1;
+	}
+
+	if (!(dep = map_dirent(old_dir, hpfs_i(old_dir)->i_dno, old_name, old_len, &dno, &qbh))) {
+		hpfs_error(i->i_sb, "lookup succeeded but map dirent failed");
+		err = -ENOENT;
+		goto end1;
+	}
+	copy_de(&de, dep);
+	de.hidden = new_name[0] == '.';
+
+	if (new_inode) {
+		int r;
+		if ((r = hpfs_remove_dirent(old_dir, dno, dep, &qbh, 1)) != 2) {
+			if ((nde = map_dirent(new_dir, hpfs_i(new_dir)->i_dno, new_name, new_len, NULL, &qbh1))) {
+				clear_nlink(new_inode);
+				copy_de(nde, &de);
+				memcpy(nde->name, new_name, new_len);
+				hpfs_mark_4buffers_dirty(&qbh1);
+				hpfs_brelse4(&qbh1);
+				goto end;
+			}
+			hpfs_error(new_dir->i_sb, "hpfs_rename: could not find dirent");
+			err = -EFSERROR;
+			goto end1;
+		}
+		err = r == 2 ? -ENOSPC : r == 1 ? -EFSERROR : 0;
+		goto end1;
+	}
+
+	if (new_dir == old_dir) hpfs_brelse4(&qbh);
+
+	if ((r = hpfs_add_dirent(new_dir, new_name, new_len, &de))) {
+		if (r == -1) hpfs_error(new_dir->i_sb, "hpfs_rename: dirent already exists!");
+		err = r == 1 ? -ENOSPC : -EFSERROR;
+		if (new_dir != old_dir) hpfs_brelse4(&qbh);
+		goto end1;
+	}
+	
+	if (new_dir == old_dir)
+		if (!(dep = map_dirent(old_dir, hpfs_i(old_dir)->i_dno, old_name, old_len, &dno, &qbh))) {
+			hpfs_error(i->i_sb, "lookup succeeded but map dirent failed at #2");
+			err = -ENOENT;
+			goto end1;
+		}
+
+	if ((r = hpfs_remove_dirent(old_dir, dno, dep, &qbh, 0))) {
+		hpfs_error(i->i_sb, "hpfs_rename: could not remove dirent");
+		err = r == 2 ? -ENOSPC : -EFSERROR;
+		goto end1;
+	}
+
+	end:
+	hpfs_i(i)->i_parent_dir = new_dir->i_ino;
+	if (S_ISDIR(i->i_mode)) {
+		inc_nlink(new_dir);
+		drop_nlink(old_dir);
+	}
+	if ((fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) {
+		fnode->up = cpu_to_le32(new_dir->i_ino);
+		fnode->len = new_len;
+		memcpy(fnode->name, new_name, new_len>15?15:new_len);
+		if (new_len < 15) memset(&fnode->name[new_len], 0, 15 - new_len);
+		mark_buffer_dirty(bh);
+		brelse(bh);
+	}
+end1:
+	hpfs_unlock(i->i_sb);
+	return err;
+}
+
+const struct inode_operations hpfs_dir_iops =
+{
+	.create		= hpfs_create,
+	.lookup		= hpfs_lookup,
+	.unlink		= hpfs_unlink,
+	.symlink	= hpfs_symlink,
+	.mkdir		= hpfs_mkdir,
+	.rmdir		= hpfs_rmdir,
+	.mknod		= hpfs_mknod,
+	.rename		= hpfs_rename,
+	.setattr	= hpfs_setattr,
+};