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msdosfs: on integrity error, fire a task to remount filesystem to ro

Browse source 
In collaboration with:	pho
Reviewed by:	markj, mckusick
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D33721
This commit is contained in:
Konstantin Belousov 2021-12-25 21:45:47 +02:00
parent b2e4b63584
commit 41e85eeab9
3 changed files with 7 additions and 1 deletions
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1
sys/fs/msdosfs/msdosfs_denode.c
View file

@ -158,6 +158,7 @@ deget(struct msdosfsmount *pmp, u_long dirclust, u_long diroffset,
badoff:
vgone(nvp);
vput(nvp);
msdosfs_integrity_error(pmp);
return (EBADF);
}
ldep = malloc(sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK | M_ZERO);

1
sys/fs/msdosfs/msdosfs_fat.c
View file

@ -412,6 +412,7 @@ usemap_free(struct msdosfsmount *pmp, u_long cn)
printf("%s: Freeing unused sector %ld %ld %x\n",
pmp->pm_mountp->mnt_stat.f_mntonname, cn, cn % N_INUSEBITS,
(unsigned)pmp->pm_inusemap[cn / N_INUSEBITS]);
msdosfs_integrity_error(pmp);
return (EINTEGRITY);
}
pmp->pm_freeclustercount++;

6
sys/fs/msdosfs/msdosfs_lookup.c
View file

@ -77,6 +77,7 @@ msdosfs_lookup_checker(struct msdosfsmount *pmp, struct vnode *dvp,
*/
if (vp == dvp) {
vput(vp);
msdosfs_integrity_error(pmp);
*vpp = NULL;
return (EBADF);
}
@ -595,10 +596,13 @@ foundroot:
vput(*vpp);
goto restart;
}
return (msdosfs_lookup_checker(pmp, vdp, VTODE(*vpp), vpp));
error = msdosfs_lookup_checker(pmp, vdp, VTODE(*vpp), vpp);
if (error != 0)
return (error);
} else if (dp->de_StartCluster == scn && isadir) {
if (cnp->cn_namelen != 1 || cnp->cn_nameptr[0] != '.') {
/* fs is corrupted, non-dot lookup returned dvp */
msdosfs_integrity_error(pmp);
return (EBADF);
}
VREF(vdp); /* we want ourself, ie "." */