From bfd8253e3473797776e4cbf70d1083d3787169fc Mon Sep 17 00:00:00 2001 From: bde Date: Fri, 25 Aug 2000 09:03:58 +0000 Subject: Quick fix for msdsofs_write() on alphas and other machines with either longs larger than 32 bits or strict alignment requirements. pm_fatmask had type u_long, but it must have a type that has precisely 32 bits and this type must be no smaller than int, so that ~pmp->pm_fatmask has no bits above the 31st set. Otherwise, comparisons between (cn | ~pmp->pm_fatmask) and magic 32-bit "cluster" numbers always fail. The correct fix is to use the C99 type uint_least32_t and mask with 0xffffffff. The quick fix is to use u_int32_t and assume that ints have msdosfs metadata is riddled with unaligned fields, and on alphas, unaligned_fixup() apparently has problems fixing up the unaligned accesses caused by this. The quick fix is to not comment out the NetBSD code that sort of handles this, and define UNALIGNED_ACCESS on i386's so that the code doesn't change on i386's. The correct fix would define UNALIGNED_ACCESS in a central machine-dependent header and maybe add some extra cases to unaligned_fixup(). UNALIGNED_ACCESS is also tested in isofs. Submitted by: parts by Mark Abene PR: 19086 --- sys/fs/msdosfs/bpb.h | 8 +++++++- sys/fs/msdosfs/msdosfsmount.h | 2 +- 2 files changed, 8 insertions(+), 2 deletions(-) (limited to 'sys/fs') diff --git a/sys/fs/msdosfs/bpb.h b/sys/fs/msdosfs/bpb.h index 88b9eef..42c941b 100644 --- a/sys/fs/msdosfs/bpb.h +++ b/sys/fs/msdosfs/bpb.h @@ -113,8 +113,14 @@ struct bpb_a { * 16-bit and 32-bit quantities on byte boundaries. If this is not true, * use the macros for the big-endian case. */ + #include -#if (BYTE_ORDER == LITTLE_ENDIAN) /* && defined(UNALIGNED_ACCESS) */ + +#ifdef __i386__ +#define UNLALIGNED_ACCESS +#endif + +#if (BYTE_ORDER == LITTLE_ENDIAN) && defined(UNALIGNED_ACCESS) #define getushort(x) *((u_int16_t *)(x)) #define getulong(x) *((u_int32_t *)(x)) #define putushort(p, v) (*((u_int16_t *)(p)) = (v)) diff --git a/sys/fs/msdosfs/msdosfsmount.h b/sys/fs/msdosfs/msdosfsmount.h index adcfad0..da49190 100644 --- a/sys/fs/msdosfs/msdosfsmount.h +++ b/sys/fs/msdosfs/msdosfsmount.h @@ -84,7 +84,7 @@ struct msdosfsmount { u_long pm_fatblocksize; /* size of fat blocks in bytes */ u_long pm_fatblocksec; /* size of fat blocks in sectors */ u_long pm_fatsize; /* size of fat in bytes */ - u_long pm_fatmask; /* mask to use for fat numbers */ + u_int32_t pm_fatmask; /* mask to use for fat numbers */ u_long pm_fsinfo; /* fsinfo block number */ u_long pm_nxtfree; /* next free cluster in fsinfo block */ u_int pm_fatmult; /* these 2 values are used in fat */ -- cgit v1.1