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Make sure file after VOP_OPEN is VMIO'd when transfering control from

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a lower layer to an upper layer.  I'm not sure how necessary this is
    for reading.

    Fix bug in union_lookup() (note: there are probably still several bugs
    in union_lookup()).  This one set lerror as a side effect without
    setting lowervp, causing copyup code further on down to crash on a null
    lowervp pointer.  Changed the side effect to use a temporary variable
    instead.
This commit is contained in:
dillon 1999-09-28 05:48:39 +00:00
parent 270eb4b19a
commit a8c800a898
4 changed files with 16 additions and 8 deletions
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6
sys/fs/unionfs/union_subr.c
View File

@ -807,8 +807,10 @@ union_copyup(un, docopy, cred, p)
(void) VOP_CLOSE(lvp, FREAD, cred, p);
(void) VOP_OPEN(uvp, FREAD, cred, p);
}
if (vn_canvmio(uvp) == TRUE)
error = vfs_object_create(uvp, p, cred);
if (un->un_openl) {
if (vn_canvmio(uvp) == TRUE)
error = vfs_object_create(uvp, p, cred);
}
un->un_openl = 0;
}

6
sys/fs/unionfs/union_vnops.c
View File

@ -404,9 +404,11 @@ union_lookup(ap)
if (cnp->cn_flags & ISWHITEOUT) {
iswhiteout = 1;
} else if (lowerdvp != NULLVP) {
lerror = VOP_GETATTR(upperdvp, &va,
int terror;
terror = VOP_GETATTR(upperdvp, &va,
cnp->cn_cred, cnp->cn_proc);
if (lerror == 0 && (va.va_flags & OPAQUE))
if (terror == 0 && (va.va_flags & OPAQUE))
iswhiteout = 1;
}
}

6
sys/miscfs/union/union_subr.c
View File

@ -807,8 +807,10 @@ union_copyup(un, docopy, cred, p)
(void) VOP_CLOSE(lvp, FREAD, cred, p);
(void) VOP_OPEN(uvp, FREAD, cred, p);
}
if (vn_canvmio(uvp) == TRUE)
error = vfs_object_create(uvp, p, cred);
if (un->un_openl) {
if (vn_canvmio(uvp) == TRUE)
error = vfs_object_create(uvp, p, cred);
}
un->un_openl = 0;
}

6
sys/miscfs/union/union_vnops.c
View File

@ -404,9 +404,11 @@ union_lookup(ap)
if (cnp->cn_flags & ISWHITEOUT) {
iswhiteout = 1;
} else if (lowerdvp != NULLVP) {
lerror = VOP_GETATTR(upperdvp, &va,
int terror;
terror = VOP_GETATTR(upperdvp, &va,
cnp->cn_cred, cnp->cn_proc);
if (lerror == 0 && (va.va_flags & OPAQUE))
if (terror == 0 && (va.va_flags & OPAQUE))
iswhiteout = 1;
}
}