diff options
Diffstat (limited to 'source4/ntvfs/posix/pvfs_oplock.c')
| -rw-r--r-- | source4/ntvfs/posix/pvfs_oplock.c | 239 |
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; +} |