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Backup FATs were sometimes marked dirty by copying their first block

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from the primary FAT, and then they were not marked clean on unmount.
Force marking them clean when appropriate.

Submitted by:	bde
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2013-02-01 18:25:53 +00:00
parent 9ec062dddd
commit 79fb7dd167
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=246218
1 changed files with 12 additions and 1 deletions
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13
sys/fs/msdosfs/msdosfs_fat.c
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@ -321,8 +321,8 @@ updatefats(pmp, bp, fatbn)
struct buf *bp;
u_long fatbn;
{
int i;
struct buf *bpn;
int cleanfat, i;
#ifdef MSDOSFS_DEBUG
printf("updatefats(pmp %p, bp %p, fatbn %lu)\n", pmp, bp, fatbn);
@ -362,12 +362,23 @@ updatefats(pmp, bp, fatbn)
* filesystem was mounted. If synch is asked for then use
* bwrite()'s and really slow things down.
*/
if (fatbn != pmp->pm_fatblk || FAT12(pmp))
cleanfat = 0;
else if (FAT16(pmp))
cleanfat = 16;
else
cleanfat = 32;
for (i = 1; i < pmp->pm_FATs; i++) {
fatbn += pmp->pm_FATsecs;
/* getblk() never fails */
bpn = getblk(pmp->pm_devvp, fatbn, bp->b_bcount,
0, 0, 0);
bcopy(bp->b_data, bpn->b_data, bp->b_bcount);
/* Force the clean bit on in the other copies. */
if (cleanfat == 16)
((u_int8_t *)bpn->b_data)[3] |= 0x80;
else if (cleanfat == 32)
((u_int8_t *)bpn->b_data)[7] |= 0x08;
if (pmp->pm_flags & MSDOSFSMNT_WAITONFAT)
bwrite(bpn);
else