X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=lib%2Futils_loop.c;h=9b316031bc524ff14687424468f533781a565208;hb=6497abd1df88001eb1f45f7348534911b33d05b5;hp=9e680725fda4ee45102a9585ba3c199aab24d77c;hpb=f7fc3bb4e50cce23dd95111b246b6e034537e2cf;p=platform%2Fupstream%2Fcryptsetup.git

diff --git a/lib/utils_loop.c b/lib/utils_loop.c
index 9e68072..9b31603 100644
--- a/lib/utils_loop.c
+++ b/lib/utils_loop.c
@@ -1,8 +1,8 @@
 /*
  * loopback block device utilities
  *
- * Copyright (C) 2009-2021 Red Hat, Inc. All rights reserved.
- * Copyright (C) 2009-2021 Milan Broz
+ * Copyright (C) 2009-2023 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2009-2023 Milan Broz
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -28,13 +28,14 @@
 #include <limits.h>
 #include <sys/ioctl.h>
 #include <sys/stat.h>
-#include <sys/types.h>
 #ifdef HAVE_SYS_SYSMACROS_H
 # include <sys/sysmacros.h>     /* for major, minor */
 #endif
+#include <linux/types.h>
 #include <linux/loop.h>
 
 #include "utils_loop.h"
+#include "libcryptsetup_macros.h"
 
 #define LOOP_DEV_MAJOR 7
 
@@ -50,9 +51,23 @@
 #define LOOP_SET_CAPACITY 0x4C07
 #endif
 
+#ifndef LOOP_SET_BLOCK_SIZE
+#define LOOP_SET_BLOCK_SIZE 0x4C09
+#endif
+
+#ifndef LOOP_CONFIGURE
+#define LOOP_CONFIGURE 0x4C0A
+struct loop_config {
+  __u32 fd;
+  __u32 block_size;
+  struct loop_info64 info;
+  __u64 __reserved[8];
+};
+#endif
+
 static char *crypt_loop_get_device_old(void)
 {
-	char dev[20];
+	char dev[64];
 	int i, loop_fd;
 	struct loop_info64 lo64 = {0};
 
@@ -101,11 +116,12 @@ static char *crypt_loop_get_device(void)
 }
 
 int crypt_loop_attach(char **loop, const char *file, int offset,
-		      int autoclear, int *readonly)
+		      int autoclear, int *readonly, size_t blocksize)
 {
-	struct loop_info64 lo64 = {0};
+	struct loop_config config = {0};
 	char *lo_file_name;
 	int loop_fd = -1, file_fd = -1, r = 1;
+	int fallback = 0;
 
 	*loop = NULL;
 
@@ -117,7 +133,18 @@ int crypt_loop_attach(char **loop, const char *file, int offset,
 	if (file_fd < 0)
 		goto out;
 
-	while (loop_fd < 0)  {
+	config.fd = file_fd;
+
+	lo_file_name = (char*)config.info.lo_file_name;
+	lo_file_name[LO_NAME_SIZE-1] = '\0';
+	strncpy(lo_file_name, file, LO_NAME_SIZE-1);
+	config.info.lo_offset = offset;
+	if (autoclear)
+		config.info.lo_flags |= LO_FLAGS_AUTOCLEAR;
+	if (blocksize > SECTOR_SIZE)
+		config.block_size = blocksize;
+
+	while (loop_fd < 0) {
 		*loop = crypt_loop_get_device();
 		if (!*loop)
 			goto out;
@@ -125,8 +152,18 @@ int crypt_loop_attach(char **loop, const char *file, int offset,
 		loop_fd = open(*loop, *readonly ? O_RDONLY : O_RDWR);
 		if (loop_fd < 0)
 			goto out;
-
-		if (ioctl(loop_fd, LOOP_SET_FD, file_fd) < 0) {
+		if (ioctl(loop_fd, LOOP_CONFIGURE, &config) < 0) {
+			if (errno == EINVAL || errno == ENOTTY) {
+				free(*loop);
+				*loop = NULL;
+
+				close(loop_fd);
+				loop_fd = -1;
+
+				/* kernel doesn't support LOOP_CONFIGURE */
+				fallback = 1;
+				break;
+			}
 			if (errno != EBUSY)
 				goto out;
 			free(*loop);
@@ -137,23 +174,40 @@ int crypt_loop_attach(char **loop, const char *file, int offset,
 		}
 	}
 
-	lo_file_name = (char*)lo64.lo_file_name;
-	lo_file_name[LO_NAME_SIZE-1] = '\0';
-	strncpy(lo_file_name, file, LO_NAME_SIZE-1);
-	lo64.lo_offset = offset;
-	if (autoclear)
-		lo64.lo_flags |= LO_FLAGS_AUTOCLEAR;
+	if (fallback) {
+		while (loop_fd < 0) {
+			*loop = crypt_loop_get_device();
+			if (!*loop)
+				goto out;
 
-	if (ioctl(loop_fd, LOOP_SET_STATUS64, &lo64) < 0) {
-		(void)ioctl(loop_fd, LOOP_CLR_FD, 0);
-		goto out;
+			loop_fd = open(*loop, *readonly ? O_RDONLY : O_RDWR);
+			if (loop_fd < 0)
+				goto out;
+			if (ioctl(loop_fd, LOOP_SET_FD, file_fd) < 0) {
+				if (errno != EBUSY)
+					goto out;
+				free(*loop);
+				*loop = NULL;
+
+				close(loop_fd);
+				loop_fd = -1;
+			}
+		}
+
+		if (blocksize > SECTOR_SIZE)
+			(void)ioctl(loop_fd, LOOP_SET_BLOCK_SIZE, (unsigned long)blocksize);
+
+		if (ioctl(loop_fd, LOOP_SET_STATUS64, &config.info) < 0) {
+			(void)ioctl(loop_fd, LOOP_CLR_FD, 0);
+			goto out;
+		}
 	}
 
 	/* Verify that autoclear is really set */
 	if (autoclear) {
-		memset(&lo64, 0, sizeof(lo64));
-		if (ioctl(loop_fd, LOOP_GET_STATUS64, &lo64) < 0 ||
-		   !(lo64.lo_flags & LO_FLAGS_AUTOCLEAR)) {
+		memset(&config.info, 0, sizeof(config.info));
+		if (ioctl(loop_fd, LOOP_GET_STATUS64, &config.info) < 0 ||
+		   !(config.info.lo_flags & LO_FLAGS_AUTOCLEAR)) {
 		(void)ioctl(loop_fd, LOOP_CLR_FD, 0);
 			goto out;
 		}