Merge tag 'fuse-fixes-5.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse

Pull fuse fixes from Miklos Szeredi:

 - Fix a regression introduced in v5.1 that triggers WARNINGs for some
   fuse filesystems

 - Fix an xfstest failure

 - Allow overlayfs to be used on top of fuse/virtiofs

 - Code and documentation cleanups

* tag 'fuse-fixes-5.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
  fuse: use true,false for bool variable
  Documentation: filesystems: convert fuse to RST
  fuse: Support RENAME_WHITEOUT flag
  fuse: don't overflow LLONG_MAX with end offset
  fix up iter on short count in fuse_direct_io()

Documentation/filesystems/index.rst

@@ -47,6 +47,7 @@ Documentation for filesystem implementations.
    :maxdepth: 2
 
    autofs
+   fuse
    overlayfs
    virtiofs
    vfat

MAINTAINERS

@@ -6903,7 +6903,7 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git
 S:	Maintained
 F:	fs/fuse/
 F:	include/uapi/linux/fuse.h
-F:	Documentation/filesystems/fuse.txt
+F:	Documentation/filesystems/fuse.rst
 
 FUTEX SUBSYSTEM
 M:	Thomas Gleixner <tglx@linutronix.de>

fs/fuse/cuse.c

@@ -451,8 +451,8 @@ static int cuse_send_init(struct cuse_conn *cc)
 	ap->args.out_args[0].size = sizeof(ia->out);
 	ap->args.out_args[0].value = &ia->out;
 	ap->args.out_args[1].size = CUSE_INIT_INFO_MAX;
-	ap->args.out_argvar = 1;
-	ap->args.out_pages = 1;
+	ap->args.out_argvar = true;
+	ap->args.out_pages = true;
 	ap->num_pages = 1;
 	ap->pages = &ia->page;
 	ap->descs = &ia->desc;

fs/fuse/dir.c

@@ -818,7 +818,7 @@ static int fuse_rename2(struct inode *olddir, struct dentry *oldent,
 	struct fuse_conn *fc = get_fuse_conn(olddir);
 	int err;
 
-	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
+	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
 		return -EINVAL;
 
 	if (flags) {

fs/fuse/file.c

@@ -803,6 +803,10 @@ static int fuse_do_readpage(struct file *file, struct page *page)
 
 	attr_ver = fuse_get_attr_version(fc);
 
+	/* Don't overflow end offset */
+	if (pos + (desc.length - 1) == LLONG_MAX)
+		desc.length--;
+
 	fuse_read_args_fill(&ia, file, pos, desc.length, FUSE_READ);
 	res = fuse_simple_request(fc, &ia.ap.args);
 	if (res < 0)
@@ -888,6 +892,14 @@ static void fuse_send_readpages(struct fuse_io_args *ia, struct file *file)
 	ap->args.out_pages = true;
 	ap->args.page_zeroing = true;
 	ap->args.page_replace = true;
+
+	/* Don't overflow end offset */
+	if (pos + (count - 1) == LLONG_MAX) {
+		count--;
+		ap->descs[ap->num_pages - 1].length--;
+	}
+	WARN_ON((loff_t) (pos + count) < 0);
+
 	fuse_read_args_fill(ia, file, pos, count, FUSE_READ);
 	ia->read.attr_ver = fuse_get_attr_version(fc);
 	if (fc->async_read) {
@@ -1397,9 +1409,9 @@ static int fuse_get_user_pages(struct fuse_args_pages *ap, struct iov_iter *ii,
 	}
 
 	if (write)
-		ap->args.in_pages = 1;
+		ap->args.in_pages = true;
 	else
-		ap->args.out_pages = 1;
+		ap->args.out_pages = true;
 
 	*nbytesp = nbytes;
 
@@ -1465,6 +1477,7 @@ ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
 		}
 		ia = NULL;
 		if (nres < 0) {
+			iov_iter_revert(iter, nbytes);
 			err = nres;
 			break;
 		}
@@ -1473,8 +1486,10 @@ ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
 		count -= nres;
 		res += nres;
 		pos += nres;
-		if (nres != nbytes)
+		if (nres != nbytes) {
+			iov_iter_revert(iter, nbytes - nres);
 			break;
+		}
 		if (count) {
 			max_pages = iov_iter_npages(iter, fc->max_pages);
 			ia = fuse_io_alloc(io, max_pages);

fs/fuse/inode.c

@@ -494,36 +494,36 @@ static int fuse_parse_param(struct fs_context *fc, struct fs_parameter *param)
 
 	case OPT_FD:
 		ctx->fd = result.uint_32;
-		ctx->fd_present = 1;
+		ctx->fd_present = true;
 		break;
 
 	case OPT_ROOTMODE:
 		if (!fuse_valid_type(result.uint_32))
 			return invalf(fc, "fuse: Invalid rootmode");
 		ctx->rootmode = result.uint_32;
-		ctx->rootmode_present = 1;
+		ctx->rootmode_present = true;
 		break;
 
 	case OPT_USER_ID:
 		ctx->user_id = make_kuid(fc->user_ns, result.uint_32);
 		if (!uid_valid(ctx->user_id))
 			return invalf(fc, "fuse: Invalid user_id");
-		ctx->user_id_present = 1;
+		ctx->user_id_present = true;
 		break;
 
 	case OPT_GROUP_ID:
 		ctx->group_id = make_kgid(fc->user_ns, result.uint_32);
 		if (!gid_valid(ctx->group_id))
 			return invalf(fc, "fuse: Invalid group_id");
-		ctx->group_id_present = 1;
+		ctx->group_id_present = true;
 		break;
 
 	case OPT_DEFAULT_PERMISSIONS:
-		ctx->default_permissions = 1;
+		ctx->default_permissions = true;
 		break;
 
 	case OPT_ALLOW_OTHER:
-		ctx->allow_other = 1;
+		ctx->allow_other = true;
 		break;
 
 	case OPT_MAX_READ:
@@ -997,7 +997,7 @@ void fuse_send_init(struct fuse_conn *fc)
 	/* Variable length argument used for backward compatibility
 	   with interface version < 7.5.  Rest of init_out is zeroed
 	   by do_get_request(), so a short reply is not a problem */
-	ia->args.out_argvar = 1;
+	ia->args.out_argvar = true;
 	ia->args.out_args[0].size = sizeof(ia->out);
 	ia->args.out_args[0].value = &ia->out;
 	ia->args.force = true;

fs/fuse/readdir.c

@@ -332,7 +332,7 @@ static int fuse_readdir_uncached(struct file *file, struct dir_context *ctx)
 		return -ENOMEM;
 
 	plus = fuse_use_readdirplus(inode, ctx);
-	ap->args.out_pages = 1;
+	ap->args.out_pages = true;
 	ap->num_pages = 1;
 	ap->pages = &page;
 	ap->descs = &desc;