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turning unmap on

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previously we noticed that calling MmUnmapLockedPages() causes kernel crashes (thus the code is if 0-ed). however, when we don't unmap memory, it keeps accumulating in the nfsd's process memory (and is never "freed").

in this patch
(a) calling unmap
(b) checking if MmMapLockedPagesSpecifyCache() returns us a NULL pointer which is a type of failure that doesn't throw an exception but still is a failure.
(c) cosmetic change to printf.

NOTE: this cause still leads to failures for general tests. Running them in a loop (previously produced kernel crashes) now just leads to test failing. the cause is unknown!
This commit is contained in:
Olga Kornievskaia 2010-12-17 13:31:23 -05:00
parent 89cd10a1f9
commit 6331621924
1 changed files with 8 additions and 3 deletions
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11
sys/nfs41_driver.c
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@ -649,13 +649,18 @@ NTSTATUS marshal_nfs41_rw(nfs41_updowncall_entry *entry,
__try {
entry->u.ReadWrite.buf =
MmMapLockedPagesSpecifyCache(entry->u.ReadWrite.MdlAddress,
UserMode, MmCached, NULL, FALSE, NormalPagePriority);
UserMode, MmNonCached, NULL, TRUE, NormalPagePriority);
DbgP("MdlAddress=%p Userspace=%p\n", entry->u.ReadWrite.MdlAddress,
entry->u.ReadWrite.buf);
if (entry->u.ReadWrite.buf == NULL) {
print_error("MmMapLockedPagesSpecifyCache failed to map pages\n");
status = STATUS_INSUFFICIENT_RESOURCES;
goto out;
}
} __except(EXCEPTION_EXECUTE_HANDLER) {
NTSTATUS code;
code = GetExceptionCode();
print_error("Call to MmMapLocked failed due to exception 0x%0x\n", code);
print_error("Call to MmMapLocked failed due to exception 0x%x\n", code);
status = STATUS_ACCESS_DENIED;
goto out;
}
@ -1396,7 +1401,7 @@ nfs41_downcall (
case NFS41_READ:
RtlCopyMemory(&cur->u.ReadWrite.len, buf, sizeof(cur->u.ReadWrite.len));
DbgP("[read/write] returned len %ld\n", cur->u.ReadWrite.len);
#if 0
#if 1
/* 08/27/2010: it looks like we really don't need to call MmUnmapLockedPages()
* eventhough we called MmMapLockedPagesSpecifyCache() as the MDL passed to us
* is already locked.