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diff --git a/sys/fs/msdosfs/msdosfs_fat.c b/sys/fs/msdosfs/msdosfs_fat.c
--- a/sys/fs/msdosfs/msdosfs_fat.c
+++ b/sys/fs/msdosfs/msdosfs_fat.c
@@ -89,11 +89,17 @@
fatblock(struct msdosfsmount *pmp, u_long ofs, u_long *bnp, u_long *sizep,
u_long *bop)
{
- u_long bn, size;
+ u_long bn, size, fatblocksec;
+ fatblocksec = pmp->pm_fatblocksec;
+ if (FAT12(pmp) && fatblocksec % 3 != 0) {
+ fatblocksec *= 3;
+ if (fatblocksec % 6 == 0)
+ fatblocksec /= 2;
+ }
bn = ofs / pmp->pm_fatblocksize * pmp->pm_fatblocksec;
- size = min(pmp->pm_fatblocksec, pmp->pm_FATsecs - bn)
- * DEV_BSIZE;
+ size = roundup(min(fatblocksec, pmp->pm_FATsecs - bn) * DEV_BSIZE,
+ pmp->pm_BlkPerSec * DEV_BSIZE);
bn += pmp->pm_fatblk + pmp->pm_curfat * pmp->pm_FATsecs;
if (bnp)
diff --git a/sys/fs/msdosfs/msdosfs_vfsops.c b/sys/fs/msdosfs/msdosfs_vfsops.c
--- a/sys/fs/msdosfs/msdosfs_vfsops.c
+++ b/sys/fs/msdosfs/msdosfs_vfsops.c
@@ -700,11 +700,14 @@
}
pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) /
SecPerClust + 1;
- pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */
+ pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE;
if (pmp->pm_fatmask == 0) {
- if (pmp->pm_maxcluster <= ((CLUST_RSRVD - CLUST_FIRST) &
- FAT12_MASK)) {
+ /*
+ * The last 10 (or 16?) clusters are reserved and must not
+ * be allocated for data.
+ */
+ if (pmp->pm_maxcluster < (CLUST_RSRVD & FAT12_MASK)) {
/*
* This will usually be a floppy disk. This size makes
* sure that one FAT entry will not be split across
@@ -720,11 +723,11 @@
}
}
- clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv;
+ clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv ;
if (pmp->pm_maxcluster >= clusters) {
#ifdef MSDOSFS_DEBUG
printf("Warning: number of clusters (%ld) exceeds FAT "
- "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters);
+ "capacity (%ld)\n", pmp->pm_maxcluster - 1, clusters);
#endif
pmp->pm_maxcluster = clusters - 1;
}
@@ -1045,7 +1048,7 @@
pmp = VFSTOMSDOSFS(mp);
sbp->f_bsize = pmp->pm_bpcluster;
sbp->f_iosize = pmp->pm_bpcluster;
- sbp->f_blocks = pmp->pm_maxcluster + 1;
+ sbp->f_blocks = pmp->pm_maxcluster - CLUST_FIRST + 1;
sbp->f_bfree = pmp->pm_freeclustercount;
sbp->f_bavail = pmp->pm_freeclustercount;
sbp->f_files = howmany(pmp->pm_rootdirsize * DEV_BSIZE,
diff --git a/sys/fs/msdosfs/msdosfs_vnops.c b/sys/fs/msdosfs/msdosfs_vnops.c
--- a/sys/fs/msdosfs/msdosfs_vnops.c
+++ b/sys/fs/msdosfs/msdosfs_vnops.c
@@ -313,8 +313,11 @@
vap->va_flags |= UF_SYSTEM;
vap->va_gen = 0;
vap->va_blocksize = pmp->pm_bpcluster;
- vap->va_bytes =
- (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
+ if (dep->de_StartCluster != MSDOSFSROOT)
+ vap->va_bytes =
+ (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
+ else
+ vap->va_bytes = 0; /* FAT12/FAT16 root dir in reserved area */
vap->va_type = ap->a_vp->v_type;
vap->va_filerev = dep->de_modrev;
return (0);

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