| 49 | /* FUNCTIONS ***************************************************************/ |
| 50 | |
| 51 | PMDL |
| 52 | Ext2CreateMdl ( |
| 53 | IN PVOID Buffer, |
| 54 | IN ULONG Length, |
| 55 | IN LOCK_OPERATION op |
| 56 | ) |
| 57 | { |
| 58 | NTSTATUS Status; |
| 59 | PMDL Mdl = NULL; |
| 60 | |
| 61 | ASSERT (Buffer != NULL); |
| 62 | Mdl = IoAllocateMdl (Buffer, Length, FALSE, FALSE, NULL); |
| 63 | if (Mdl == NULL) { |
| 64 | Status = STATUS_INSUFFICIENT_RESOURCES; |
| 65 | } else { |
| 66 | __try { |
| 67 | if (MmIsNonPagedSystemAddressValid(Buffer)) { |
| 68 | MmBuildMdlForNonPagedPool(Mdl); |
| 69 | } else { |
| 70 | MmProbeAndLockPages(Mdl, KernelMode, op); |
| 71 | } |
| 72 | Status = STATUS_SUCCESS; |
| 73 | } __except (EXCEPTION_EXECUTE_HANDLER) { |
| 74 | IoFreeMdl (Mdl); |
| 75 | Mdl = NULL; |
| 76 | DbgBreak(); |
| 77 | Status = STATUS_INVALID_USER_BUFFER; |
| 78 | } |
| 79 | } |
| 80 | return Mdl; |
| 81 | } |
| 82 | |
| 83 | |
| 84 | VOID |