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Diffstat (limited to 'source4/ntvfs/posix/pvfs_oplock.c')
-rw-r--r--source4/ntvfs/posix/pvfs_oplock.c239
1 files changed, 239 insertions, 0 deletions
diff --git a/source4/ntvfs/posix/pvfs_oplock.c b/source4/ntvfs/posix/pvfs_oplock.c
new file mode 100644
index 0000000000..cf30ddbc59
--- /dev/null
+++ b/source4/ntvfs/posix/pvfs_oplock.c
@@ -0,0 +1,239 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ POSIX NTVFS backend - oplock handling
+
+ Copyright (C) Stefan Metzmacher 2008
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "lib/messaging/messaging.h"
+#include "lib/messaging/irpc.h"
+#include "vfs_posix.h"
+
+
+struct pvfs_oplock {
+ struct pvfs_file_handle *handle;
+ struct pvfs_file *file;
+ uint32_t level;
+ struct messaging_context *msg_ctx;
+};
+
+/*
+ receive oplock breaks and forward them to the client
+*/
+static void pvfs_oplock_break(struct pvfs_oplock *opl, uint8_t level)
+{
+ NTSTATUS status;
+ struct pvfs_file *f = opl->file;
+ struct pvfs_file_handle *h = opl->handle;
+ struct pvfs_state *pvfs = h->pvfs;
+
+ DEBUG(10,("pvfs_oplock_break: sending oplock break level %d for '%s' %p\n",
+ level, h->name->original_name, h));
+ status = ntvfs_send_oplock_break(pvfs->ntvfs, f->ntvfs, level);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0,("pvfs_oplock_break: sending oplock break failed: %s\n",
+ nt_errstr(status)));
+ }
+}
+
+static void pvfs_oplock_break_dispatch(struct messaging_context *msg,
+ void *private_data, uint32_t msg_type,
+ struct server_id src, DATA_BLOB *data)
+{
+ struct pvfs_oplock *opl = talloc_get_type(private_data,
+ struct pvfs_oplock);
+ struct opendb_oplock_break opb;
+
+ ZERO_STRUCT(opb);
+
+ /* we need to check that this one is for us. See
+ messaging_send_ptr() for the other side of this.
+ */
+ if (data->length == sizeof(struct opendb_oplock_break)) {
+ struct opendb_oplock_break *p;
+ p = (struct opendb_oplock_break *)data->data;
+ opb = *p;
+ } else {
+ DEBUG(0,("%s: ignore oplock break with length[%u]\n",
+ __location__, data->length));
+ return;
+ }
+ if (opb.file_handle != opl->handle) {
+ return;
+ }
+
+ /*
+ * maybe we should use ntvfs_setup_async()
+ */
+ pvfs_oplock_break(opl, opb.level);
+}
+
+static int pvfs_oplock_destructor(struct pvfs_oplock *opl)
+{
+ messaging_deregister(opl->msg_ctx, MSG_NTVFS_OPLOCK_BREAK, opl);
+ return 0;
+}
+
+NTSTATUS pvfs_setup_oplock(struct pvfs_file *f, uint32_t oplock_granted)
+{
+ NTSTATUS status;
+ struct pvfs_oplock *opl;
+ uint32_t level = OPLOCK_NONE;
+
+ f->handle->oplock = NULL;
+
+ switch (oplock_granted) {
+ case EXCLUSIVE_OPLOCK_RETURN:
+ level = OPLOCK_EXCLUSIVE;
+ break;
+ case BATCH_OPLOCK_RETURN:
+ level = OPLOCK_BATCH;
+ break;
+ case LEVEL_II_OPLOCK_RETURN:
+ level = OPLOCK_LEVEL_II;
+ break;
+ }
+
+ if (level == OPLOCK_NONE) {
+ return NT_STATUS_OK;
+ }
+
+ opl = talloc(f->handle, struct pvfs_oplock);
+ NT_STATUS_HAVE_NO_MEMORY(opl);
+
+ opl->handle = f->handle;
+ opl->file = f;
+ opl->level = level;
+ opl->msg_ctx = f->pvfs->ntvfs->ctx->msg_ctx;
+
+ status = messaging_register(opl->msg_ctx,
+ opl,
+ MSG_NTVFS_OPLOCK_BREAK,
+ pvfs_oplock_break_dispatch);
+ NT_STATUS_NOT_OK_RETURN(status);
+
+ /* destructor */
+ talloc_set_destructor(opl, pvfs_oplock_destructor);
+
+ f->handle->oplock = opl;
+
+ return NT_STATUS_OK;
+}
+
+NTSTATUS pvfs_oplock_release(struct ntvfs_module_context *ntvfs,
+ struct ntvfs_request *req, union smb_lock *lck)
+{
+ struct pvfs_state *pvfs = ntvfs->private_data;
+ struct pvfs_file *f;
+ struct pvfs_file_handle *h;
+ struct odb_lock *olck;
+ uint8_t oplock_break;
+ NTSTATUS status;
+
+ f = pvfs_find_fd(pvfs, req, lck->lockx.in.file.ntvfs);
+ if (!f) {
+ return NT_STATUS_INVALID_HANDLE;
+ }
+
+ h = f->handle;
+
+ if (h->fd == -1) {
+ return NT_STATUS_FILE_IS_A_DIRECTORY;
+ }
+
+ if (!h->have_opendb_entry) {
+ return NT_STATUS_FOOBAR;
+ }
+
+ if (!h->oplock) {
+ return NT_STATUS_FOOBAR;
+ }
+
+ olck = odb_lock(h, h->pvfs->odb_context, &h->odb_locking_key);
+ if (olck == NULL) {
+ DEBUG(0,("Unable to lock opendb for oplock update\n"));
+ return NT_STATUS_FOOBAR;
+ }
+
+ oplock_break = (lck->lockx.in.mode >> 8) & 0xFF;
+ if (oplock_break == OPLOCK_BREAK_TO_NONE) {
+ h->oplock->level = OPLOCK_NONE;
+ } else if (oplock_break == OPLOCK_BREAK_TO_LEVEL_II) {
+ h->oplock->level = OPLOCK_LEVEL_II;
+ } else {
+ /* fallback to level II in case of a invalid value */
+ DEBUG(1,("unexpected oplock break level[0x%02X]\n", oplock_break));
+ h->oplock->level = OPLOCK_LEVEL_II;
+ }
+ status = odb_update_oplock(olck, h, h->oplock->level);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0,("Unable to update oplock level for '%s' - %s\n",
+ h->name->full_name, nt_errstr(status)));
+ talloc_free(olck);
+ return status;
+ }
+
+ talloc_free(olck);
+
+ /* after a break to none, we no longer have an oplock attached */
+ if (h->oplock->level == OPLOCK_NONE) {
+ talloc_free(h->oplock);
+ h->oplock = NULL;
+ }
+
+ return NT_STATUS_OK;
+}
+
+NTSTATUS pvfs_break_level2_oplocks(struct pvfs_file *f)
+{
+ struct pvfs_file_handle *h = f->handle;
+ struct odb_lock *olck;
+ NTSTATUS status;
+
+ if (h->oplock && h->oplock->level == OPLOCK_EXCLUSIVE) {
+ return NT_STATUS_OK;
+ }
+
+ olck = odb_lock(h, h->pvfs->odb_context, &h->odb_locking_key);
+ if (olck == NULL) {
+ DEBUG(0,("Unable to lock opendb for oplock update\n"));
+ return NT_STATUS_FOOBAR;
+ }
+
+ if (h->oplock && h->oplock->level == OPLOCK_BATCH) {
+ status = odb_update_oplock(olck, h, OPLOCK_LEVEL_II);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0,("Unable to update oplock level for '%s' - %s\n",
+ h->name->full_name, nt_errstr(status)));
+ talloc_free(olck);
+ return status;
+ }
+ }
+
+ status = odb_break_oplocks(olck);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0,("Unable to break level2 oplocks to none for '%s' - %s\n",
+ h->name->full_name, nt_errstr(status)));
+ talloc_free(olck);
+ return status;
+ }
+
+ talloc_free(olck);
+
+ return NT_STATUS_OK;
+}