Use __packed to prevent alignment from taking place, which otherwise may

change the on-disk format in an incompatible way.  Without this change,
msdosfs created on FreeBSD/arm would not be mountable.

PR:		bin/162486
Submitted by:	Ian Lepore <freebsd damnhippie dyndns org>
Reported by:	Mattia Rossi <mrossi at swin.edu.au>
MFC after:	3 days

1 files changed, 5 insertions, 5 deletions

diff --git a/sbin/newfs_msdos/newfs_msdos.c b/sbin/newfs_msdos/newfs_msdos.c
index 6d8fa7e..c7ec59b 100644
--- a/sbin/newfs_msdos/newfs_msdos.c
+++ b/sbin/newfs_msdos/newfs_msdos.c
@@ -99,7 +99,7 @@ static const char rcsid[] =
 struct bs {
     u_int8_t bsJump[3];		/* bootstrap entry point */
     u_int8_t bsOemName[8];		/* OEM name and version */
-};
+} __packed;
 
 struct bsbpb {
     u_int8_t bpbBytesPerSec[2];		/* bytes per sector */
@@ -114,7 +114,7 @@ struct bsbpb {
     u_int8_t bpbHeads[2];		/* drive heads */
     u_int8_t bpbHiddenSecs[4];		/* hidden sectors */
     u_int8_t bpbHugeSectors[4];		/* big total sectors */
-};
+} __packed;
 
 struct bsxbpb {
     u_int8_t bpbBigFATsecs[4];		/* big sectors per FAT */
@@ -124,7 +124,7 @@ struct bsxbpb {
     u_int8_t bpbFSInfo[2];		/* file system info sector */
     u_int8_t bpbBackup[2];		/* backup boot sector */
     u_int8_t bpbReserved[12];			/* reserved */
-};
+} __packed;
 
 struct bsx {
     u_int8_t exDriveNumber;		/* drive number */
@@ -133,7 +133,7 @@ struct bsx {
     u_int8_t exVolumeID[4];		/* volume ID number */
     u_int8_t exVolumeLabel[11]; 	/* volume label */
     u_int8_t exFileSysType[8];		/* file system type */
-};
+} __packed;
 
 struct de {
     u_int8_t deName[11];	/* name and extension */
@@ -143,7 +143,7 @@ struct de {
     u_int8_t deMDate[2];	/* creation date */
     u_int8_t deStartCluster[2];	/* starting cluster */
     u_int8_t deFileSize[4];	/* size */
-};
+} __packed;
 
 struct bpb {
     u_int bpbBytesPerSec;		/* bytes per sector */