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MSDOS FS used to allocate a buffer before extending the VM object. In

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certain error conditions, it is possible for pages to be left allocated
in the object beyond it's end.  It is generally bad practice to allocate
pages beyond the end of an object.
This commit is contained in:
John Dyson 1996-10-02 05:01:17 +00:00
parent 9080596148
commit 39b1a97c77
2 changed files with 18 additions and 14 deletions
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16
sys/fs/msdosfs/msdosfs_vnops.c
View file

@ -1,4 +1,4 @@
/* $Id: msdosfs_vnops.c,v 1.32 1996/09/03 14:23:33 bde Exp $ */
/* $Id: msdosfs_vnops.c,v 1.33 1996/09/19 18:20:47 nate Exp $ */
/* $NetBSD: msdosfs_vnops.c,v 1.20 1994/08/21 18:44:13 ws Exp $ */
/*-
@ -731,6 +731,14 @@ msdosfs_write(ap)
break;
}
croffset = uio->uio_offset & pmp->pm_crbomask;
n = min(uio->uio_resid, pmp->pm_bpcluster - croffset);
if (uio->uio_offset + n > dep->de_FileSize) {
dep->de_FileSize = uio->uio_offset + n;
/* The object size needs to be set before buffer is allocated */
vnode_pager_setsize(vp, dep->de_FileSize);
}
if ((uio->uio_offset & pmp->pm_crbomask) == 0
&& (de_blk(pmp, uio->uio_offset + uio->uio_resid) > de_blk(pmp, uio->uio_offset)
|| uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) {
@ -768,12 +776,6 @@ msdosfs_write(ap)
break;
}
croffset = uio->uio_offset & pmp->pm_crbomask;
n = min(uio->uio_resid, pmp->pm_bpcluster - croffset);
if (uio->uio_offset + n > dep->de_FileSize) {
dep->de_FileSize = uio->uio_offset + n;
vnode_pager_setsize(vp, dep->de_FileSize); /* why? */
}
/*
* Should these vnode_pager_* functions be done on dir
* files?

16
sys/msdosfs/msdosfs_vnops.c
View file

@ -1,4 +1,4 @@
/* $Id: msdosfs_vnops.c,v 1.32 1996/09/03 14:23:33 bde Exp $ */
/* $Id: msdosfs_vnops.c,v 1.33 1996/09/19 18:20:47 nate Exp $ */
/* $NetBSD: msdosfs_vnops.c,v 1.20 1994/08/21 18:44:13 ws Exp $ */
/*-
@ -731,6 +731,14 @@ msdosfs_write(ap)
break;
}
croffset = uio->uio_offset & pmp->pm_crbomask;
n = min(uio->uio_resid, pmp->pm_bpcluster - croffset);
if (uio->uio_offset + n > dep->de_FileSize) {
dep->de_FileSize = uio->uio_offset + n;
/* The object size needs to be set before buffer is allocated */
vnode_pager_setsize(vp, dep->de_FileSize);
}
if ((uio->uio_offset & pmp->pm_crbomask) == 0
&& (de_blk(pmp, uio->uio_offset + uio->uio_resid) > de_blk(pmp, uio->uio_offset)
|| uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) {
@ -768,12 +776,6 @@ msdosfs_write(ap)
break;
}
croffset = uio->uio_offset & pmp->pm_crbomask;
n = min(uio->uio_resid, pmp->pm_bpcluster - croffset);
if (uio->uio_offset + n > dep->de_FileSize) {
dep->de_FileSize = uio->uio_offset + n;
vnode_pager_setsize(vp, dep->de_FileSize); /* why? */
}
/*
* Should these vnode_pager_* functions be done on dir
* files?