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https://github.com/samba-team/samba.git
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73b200064f
Signed-off-by: Stefan Metzmacher <metze@samba.org>
1015 lines
31 KiB
C
1015 lines
31 KiB
C
/*
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Unix SMB/CIFS implementation.
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oplock processing
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Copyright (C) Andrew Tridgell 1992-1998
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Copyright (C) Jeremy Allison 1998 - 2001
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Copyright (C) Volker Lendecke 2005
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define DBGC_CLASS DBGC_LOCKING
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#include "includes.h"
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#include "smbd/smbd.h"
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#include "smbd/globals.h"
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#include "messages.h"
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#include "../librpc/gen_ndr/open_files.h"
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/*
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* helper function used by the kernel oplock backends to post the break message
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*/
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void break_kernel_oplock(struct messaging_context *msg_ctx, files_struct *fsp)
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{
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uint8_t msg[MSG_SMB_KERNEL_BREAK_SIZE];
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/* Put the kernel break info into the message. */
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push_file_id_24((char *)msg, &fsp->file_id);
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SIVAL(msg,24,fsp->fh->gen_id);
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/* Don't need to be root here as we're only ever
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sending to ourselves. */
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messaging_send_buf(msg_ctx, messaging_server_id(msg_ctx),
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MSG_SMB_KERNEL_BREAK,
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msg, MSG_SMB_KERNEL_BREAK_SIZE);
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}
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/****************************************************************************
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Attempt to set an oplock on a file. Succeeds if kernel oplocks are
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disabled (just sets flags) and no byte-range locks in the file. Returns True
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if oplock set.
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****************************************************************************/
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NTSTATUS set_file_oplock(files_struct *fsp, int oplock_type)
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{
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struct smbd_server_connection *sconn = fsp->conn->sconn;
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struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
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bool use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) && koplocks;
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if (fsp->oplock_type == LEVEL_II_OPLOCK) {
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if (use_kernel &&
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!(koplocks->flags & KOPLOCKS_LEVEL2_SUPPORTED)) {
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DEBUG(10, ("Refusing level2 oplock, kernel oplocks "
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"don't support them\n"));
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return NT_STATUS_NOT_SUPPORTED;
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}
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}
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if ((fsp->oplock_type != NO_OPLOCK) &&
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(fsp->oplock_type != FAKE_LEVEL_II_OPLOCK) &&
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use_kernel &&
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!koplocks->ops->set_oplock(koplocks, fsp, oplock_type))
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{
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return map_nt_error_from_unix(errno);
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}
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fsp->oplock_type = oplock_type;
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fsp->sent_oplock_break = NO_BREAK_SENT;
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if (oplock_type == LEVEL_II_OPLOCK) {
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sconn->oplocks.level_II_open++;
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} else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
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sconn->oplocks.exclusive_open++;
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}
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DEBUG(5,("set_file_oplock: granted oplock on file %s, %s/%lu, "
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"tv_sec = %x, tv_usec = %x\n",
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fsp_str_dbg(fsp), file_id_string_tos(&fsp->file_id),
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fsp->fh->gen_id, (int)fsp->open_time.tv_sec,
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(int)fsp->open_time.tv_usec ));
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return NT_STATUS_OK;
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}
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/****************************************************************************
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Attempt to release an oplock on a file. Decrements oplock count.
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****************************************************************************/
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void release_file_oplock(files_struct *fsp)
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{
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struct smbd_server_connection *sconn = fsp->conn->sconn;
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struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
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if ((fsp->oplock_type != NO_OPLOCK) &&
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(fsp->oplock_type != FAKE_LEVEL_II_OPLOCK) &&
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koplocks) {
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koplocks->ops->release_oplock(koplocks, fsp, NO_OPLOCK);
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}
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if (fsp->oplock_type == LEVEL_II_OPLOCK) {
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sconn->oplocks.level_II_open--;
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} else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
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sconn->oplocks.exclusive_open--;
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}
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SMB_ASSERT(sconn->oplocks.exclusive_open>=0);
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SMB_ASSERT(sconn->oplocks.level_II_open>=0);
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if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
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/* This doesn't matter for close. */
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fsp->oplock_type = FAKE_LEVEL_II_OPLOCK;
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} else {
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fsp->oplock_type = NO_OPLOCK;
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}
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fsp->sent_oplock_break = NO_BREAK_SENT;
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flush_write_cache(fsp, OPLOCK_RELEASE_FLUSH);
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delete_write_cache(fsp);
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TALLOC_FREE(fsp->oplock_timeout);
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}
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/****************************************************************************
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Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
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****************************************************************************/
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static void downgrade_file_oplock(files_struct *fsp)
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{
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struct smbd_server_connection *sconn = fsp->conn->sconn;
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struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
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if (!EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
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DEBUG(0, ("trying to downgrade an already-downgraded oplock!\n"));
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return;
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}
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if (koplocks) {
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koplocks->ops->release_oplock(koplocks, fsp, LEVEL_II_OPLOCK);
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}
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fsp->oplock_type = LEVEL_II_OPLOCK;
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sconn->oplocks.exclusive_open--;
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sconn->oplocks.level_II_open++;
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fsp->sent_oplock_break = NO_BREAK_SENT;
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}
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/****************************************************************************
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Remove a file oplock. Copes with level II and exclusive.
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Locks then unlocks the share mode lock. Client can decide to go directly
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to none even if a "break-to-level II" was sent.
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****************************************************************************/
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bool remove_oplock(files_struct *fsp)
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{
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bool ret;
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struct share_mode_lock *lck;
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/* Remove the oplock flag from the sharemode. */
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lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
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if (lck == NULL) {
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DEBUG(0,("remove_oplock: failed to lock share entry for "
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"file %s\n", fsp_str_dbg(fsp)));
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return False;
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}
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ret = remove_share_oplock(lck, fsp);
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if (!ret) {
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DEBUG(0,("remove_oplock: failed to remove share oplock for "
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"file %s, %s, %s\n",
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fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
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file_id_string_tos(&fsp->file_id)));
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}
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release_file_oplock(fsp);
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TALLOC_FREE(lck);
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return ret;
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}
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/*
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* Deal with a reply when a break-to-level II was sent.
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*/
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bool downgrade_oplock(files_struct *fsp)
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{
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bool ret;
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struct share_mode_lock *lck;
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lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
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if (lck == NULL) {
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DEBUG(0,("downgrade_oplock: failed to lock share entry for "
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"file %s\n", fsp_str_dbg(fsp)));
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return False;
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}
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ret = downgrade_share_oplock(lck, fsp);
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if (!ret) {
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DEBUG(0,("downgrade_oplock: failed to downgrade share oplock "
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"for file %s, %s, file_id %s\n",
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fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
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file_id_string_tos(&fsp->file_id)));
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}
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downgrade_file_oplock(fsp);
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TALLOC_FREE(lck);
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return ret;
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}
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/*
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* Some kernel oplock implementations handle the notification themselves.
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*/
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bool should_notify_deferred_opens(struct smbd_server_connection *sconn)
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{
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struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
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return !(koplocks &&
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(koplocks->flags & KOPLOCKS_DEFERRED_OPEN_NOTIFICATION));
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}
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/****************************************************************************
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Set up an oplock break message.
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****************************************************************************/
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static char *new_break_message_smb1(TALLOC_CTX *mem_ctx,
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files_struct *fsp, int cmd)
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{
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char *result = talloc_array(mem_ctx, char, smb_size + 8*2 + 0);
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if (result == NULL) {
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DEBUG(0, ("talloc failed\n"));
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return NULL;
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}
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memset(result,'\0',smb_size);
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srv_set_message(result,8,0,true);
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SCVAL(result,smb_com,SMBlockingX);
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SSVAL(result,smb_tid,fsp->conn->cnum);
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SSVAL(result,smb_pid,0xFFFF);
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SSVAL(result,smb_uid,0);
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SSVAL(result,smb_mid,0xFFFF);
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SCVAL(result,smb_vwv0,0xFF);
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SSVAL(result,smb_vwv2,fsp->fnum);
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SCVAL(result,smb_vwv3,LOCKING_ANDX_OPLOCK_RELEASE);
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SCVAL(result,smb_vwv3+1,cmd);
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return result;
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}
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/****************************************************************************
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Function to do the waiting before sending a local break.
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****************************************************************************/
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static void wait_before_sending_break(void)
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{
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long wait_time = (long)lp_oplock_break_wait_time();
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if (wait_time) {
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smb_msleep(wait_time);
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}
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}
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/****************************************************************************
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Ensure that we have a valid oplock.
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****************************************************************************/
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static files_struct *initial_break_processing(
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struct smbd_server_connection *sconn, struct file_id id,
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unsigned long file_id)
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{
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files_struct *fsp = NULL;
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if( DEBUGLVL( 3 ) ) {
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dbgtext( "initial_break_processing: called for %s/%u\n",
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file_id_string_tos(&id), (int)file_id);
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dbgtext( "Current oplocks_open (exclusive = %d, levelII = %d)\n",
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sconn->oplocks.exclusive_open,
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sconn->oplocks.level_II_open);
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}
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/*
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* We need to search the file open table for the
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* entry containing this dev and inode, and ensure
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* we have an oplock on it.
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*/
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fsp = file_find_dif(sconn, id, file_id);
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if(fsp == NULL) {
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/* The file could have been closed in the meantime - return success. */
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if( DEBUGLVL( 3 ) ) {
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dbgtext( "initial_break_processing: cannot find open file with " );
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dbgtext( "file_id %s gen_id = %lu", file_id_string_tos(&id), file_id);
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dbgtext( "allowing break to succeed.\n" );
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}
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return NULL;
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}
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/* Ensure we have an oplock on the file */
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/*
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* There is a potential race condition in that an oplock could
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* have been broken due to another udp request, and yet there are
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* still oplock break messages being sent in the udp message
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* queue for this file. So return true if we don't have an oplock,
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* as we may have just freed it.
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*/
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if(fsp->oplock_type == NO_OPLOCK) {
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if( DEBUGLVL( 3 ) ) {
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dbgtext( "initial_break_processing: file %s ",
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fsp_str_dbg(fsp));
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dbgtext( "(file_id = %s gen_id = %lu) has no oplock.\n",
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file_id_string_tos(&id), fsp->fh->gen_id );
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dbgtext( "Allowing break to succeed regardless.\n" );
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}
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return NULL;
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}
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return fsp;
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}
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static void oplock_timeout_handler(struct event_context *ctx,
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struct timed_event *te,
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struct timeval now,
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void *private_data)
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{
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files_struct *fsp = (files_struct *)private_data;
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/* Remove the timed event handler. */
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TALLOC_FREE(fsp->oplock_timeout);
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DEBUG(0, ("Oplock break failed for file %s -- replying anyway\n",
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fsp_str_dbg(fsp)));
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remove_oplock(fsp);
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reply_to_oplock_break_requests(fsp);
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}
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/*******************************************************************
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Add a timeout handler waiting for the client reply.
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*******************************************************************/
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static void add_oplock_timeout_handler(files_struct *fsp)
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{
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struct smbd_server_connection *sconn = fsp->conn->sconn;
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struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
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/*
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* If kernel oplocks already notifies smbds when an oplock break times
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* out, just return.
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*/
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if (koplocks &&
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(koplocks->flags & KOPLOCKS_TIMEOUT_NOTIFICATION)) {
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return;
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}
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if (fsp->oplock_timeout != NULL) {
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DEBUG(0, ("Logic problem -- have an oplock event hanging "
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"around\n"));
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}
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fsp->oplock_timeout =
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tevent_add_timer(fsp->conn->sconn->ev_ctx, fsp,
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timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0),
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oplock_timeout_handler, fsp);
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if (fsp->oplock_timeout == NULL) {
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DEBUG(0, ("Could not add oplock timeout handler\n"));
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}
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}
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static void send_break_message_smb1(files_struct *fsp, int level)
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{
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char *break_msg = new_break_message_smb1(talloc_tos(),
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fsp,
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level);
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if (break_msg == NULL) {
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exit_server("Could not talloc break_msg\n");
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}
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show_msg(break_msg);
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if (!srv_send_smb(fsp->conn->sconn,
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break_msg, false, 0,
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IS_CONN_ENCRYPTED(fsp->conn),
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NULL)) {
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exit_server_cleanly("send_break_message_smb1: "
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"srv_send_smb failed.");
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}
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TALLOC_FREE(break_msg);
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}
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void break_level2_to_none_async(files_struct *fsp)
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{
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struct smbd_server_connection *sconn = fsp->conn->sconn;
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if (fsp->oplock_type == NO_OPLOCK) {
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/* We already got a "break to none" message and we've handled
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* it. just ignore. */
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DEBUG(3, ("process_oplock_async_level2_break_message: already "
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"broken to none, ignoring.\n"));
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return;
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}
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if (fsp->oplock_type == FAKE_LEVEL_II_OPLOCK) {
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/* Don't tell the client, just downgrade. */
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DEBUG(3, ("process_oplock_async_level2_break_message: "
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"downgrading fake level 2 oplock.\n"));
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remove_oplock(fsp);
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return;
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}
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/* Ensure we're really at level2 state. */
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SMB_ASSERT(fsp->oplock_type == LEVEL_II_OPLOCK);
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DEBUG(10,("process_oplock_async_level2_break_message: sending break "
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"to none message for %s, file %s\n", fsp_fnum_dbg(fsp),
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fsp_str_dbg(fsp)));
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/* Now send a break to none message to our client. */
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if (sconn->using_smb2) {
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send_break_message_smb2(fsp, OPLOCKLEVEL_NONE);
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} else {
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send_break_message_smb1(fsp, OPLOCKLEVEL_NONE);
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}
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/* Async level2 request, don't send a reply, just remove the oplock. */
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remove_oplock(fsp);
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}
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/*******************************************************************
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This handles the case of a write triggering a break to none
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message on a level2 oplock.
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When we get this message we may be in any of three states :
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NO_OPLOCK, LEVEL_II, FAKE_LEVEL2. We only send a message to
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the client for LEVEL2.
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*******************************************************************/
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static void process_oplock_async_level2_break_message(struct messaging_context *msg_ctx,
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void *private_data,
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uint32_t msg_type,
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struct server_id src,
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DATA_BLOB *data)
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{
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struct share_mode_entry msg;
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files_struct *fsp;
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struct smbd_server_connection *sconn =
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talloc_get_type_abort(private_data,
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struct smbd_server_connection);
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if (data->data == NULL) {
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DEBUG(0, ("Got NULL buffer\n"));
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return;
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}
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if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
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DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
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return;
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}
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/* De-linearize incoming message. */
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message_to_share_mode_entry(&msg, (char *)data->data);
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DEBUG(10, ("Got oplock async level 2 break message from pid %s: "
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"%s/%llu\n", server_id_str(talloc_tos(), &src),
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file_id_string_tos(&msg.id),
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(unsigned long long)msg.share_file_id));
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fsp = initial_break_processing(sconn, msg.id, msg.share_file_id);
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|
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if (fsp == NULL) {
|
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/* We hit a race here. Break messages are sent, and before we
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* get to process this message, we have closed the file.
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* No need to reply as this is an async message. */
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DEBUG(3, ("process_oplock_async_level2_break_message: Did not find fsp, ignoring\n"));
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return;
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}
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break_level2_to_none_async(fsp);
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}
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/*******************************************************************
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|
This handles the generic oplock break message from another smbd.
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*******************************************************************/
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|
|
static void process_oplock_break_message(struct messaging_context *msg_ctx,
|
|
void *private_data,
|
|
uint32_t msg_type,
|
|
struct server_id src,
|
|
DATA_BLOB *data)
|
|
{
|
|
struct share_mode_entry msg;
|
|
files_struct *fsp;
|
|
bool break_to_level2 = False;
|
|
bool use_kernel;
|
|
struct smbd_server_connection *sconn =
|
|
talloc_get_type_abort(private_data,
|
|
struct smbd_server_connection);
|
|
struct server_id self = messaging_server_id(sconn->msg_ctx);
|
|
struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
|
|
|
|
if (data->data == NULL) {
|
|
DEBUG(0, ("Got NULL buffer\n"));
|
|
return;
|
|
}
|
|
|
|
if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
|
|
DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
|
|
return;
|
|
}
|
|
|
|
/* De-linearize incoming message. */
|
|
message_to_share_mode_entry(&msg, (char *)data->data);
|
|
|
|
DEBUG(10, ("Got oplock break message from pid %s: %s/%llu\n",
|
|
server_id_str(talloc_tos(), &src),
|
|
file_id_string_tos(&msg.id),
|
|
(unsigned long long)msg.share_file_id));
|
|
|
|
fsp = initial_break_processing(sconn, msg.id, msg.share_file_id);
|
|
|
|
if (fsp == NULL) {
|
|
/* We hit a race here. Break messages are sent, and before we
|
|
* get to process this message, we have closed the file. Reply
|
|
* with 'ok, oplock broken' */
|
|
DEBUG(3, ("Did not find fsp\n"));
|
|
|
|
/* We just send the same message back. */
|
|
messaging_send_buf(msg_ctx, src, MSG_SMB_BREAK_RESPONSE,
|
|
(uint8 *)data->data,
|
|
MSG_SMB_SHARE_MODE_ENTRY_SIZE);
|
|
return;
|
|
}
|
|
|
|
if (fsp->sent_oplock_break != NO_BREAK_SENT) {
|
|
/* Remember we have to inform the requesting PID when the
|
|
* client replies */
|
|
msg.pid = src;
|
|
ADD_TO_ARRAY(NULL, struct share_mode_entry, msg,
|
|
&fsp->pending_break_messages,
|
|
&fsp->num_pending_break_messages);
|
|
return;
|
|
}
|
|
|
|
if (EXCLUSIVE_OPLOCK_TYPE(msg.op_type) &&
|
|
!EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
|
|
DEBUG(3, ("Already downgraded oplock on %s: %s\n",
|
|
file_id_string_tos(&fsp->file_id),
|
|
fsp_str_dbg(fsp)));
|
|
/* We just send the same message back. */
|
|
messaging_send_buf(msg_ctx, src, MSG_SMB_BREAK_RESPONSE,
|
|
(uint8 *)data->data,
|
|
MSG_SMB_SHARE_MODE_ENTRY_SIZE);
|
|
return;
|
|
}
|
|
|
|
use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) && koplocks;
|
|
|
|
if ((global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
|
|
!(msg.op_type & FORCE_OPLOCK_BREAK_TO_NONE) &&
|
|
!(use_kernel && !(koplocks->flags & KOPLOCKS_LEVEL2_SUPPORTED)) &&
|
|
lp_level2_oplocks(SNUM(fsp->conn))) {
|
|
break_to_level2 = True;
|
|
}
|
|
|
|
/* Need to wait before sending a break
|
|
message if we sent ourselves this message. */
|
|
if (serverid_equal(&self, &src)) {
|
|
wait_before_sending_break();
|
|
}
|
|
|
|
if (sconn->using_smb2) {
|
|
send_break_message_smb2(fsp, break_to_level2 ?
|
|
OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
|
|
} else {
|
|
send_break_message_smb1(fsp, break_to_level2 ?
|
|
OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
|
|
}
|
|
|
|
fsp->sent_oplock_break = break_to_level2 ? LEVEL_II_BREAK_SENT:BREAK_TO_NONE_SENT;
|
|
|
|
msg.pid = src;
|
|
ADD_TO_ARRAY(NULL, struct share_mode_entry, msg,
|
|
&fsp->pending_break_messages,
|
|
&fsp->num_pending_break_messages);
|
|
|
|
add_oplock_timeout_handler(fsp);
|
|
}
|
|
|
|
/*******************************************************************
|
|
This handles the kernel oplock break message.
|
|
*******************************************************************/
|
|
|
|
static void process_kernel_oplock_break(struct messaging_context *msg_ctx,
|
|
void *private_data,
|
|
uint32_t msg_type,
|
|
struct server_id src,
|
|
DATA_BLOB *data)
|
|
{
|
|
struct file_id id;
|
|
unsigned long file_id;
|
|
files_struct *fsp;
|
|
struct smbd_server_connection *sconn =
|
|
talloc_get_type_abort(private_data,
|
|
struct smbd_server_connection);
|
|
|
|
if (data->data == NULL) {
|
|
DEBUG(0, ("Got NULL buffer\n"));
|
|
return;
|
|
}
|
|
|
|
if (data->length != MSG_SMB_KERNEL_BREAK_SIZE) {
|
|
DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
|
|
return;
|
|
}
|
|
|
|
/* Pull the data from the message. */
|
|
pull_file_id_24((char *)data->data, &id);
|
|
file_id = (unsigned long)IVAL(data->data, 24);
|
|
|
|
DEBUG(10, ("Got kernel oplock break message from pid %s: %s/%u\n",
|
|
server_id_str(talloc_tos(), &src), file_id_string_tos(&id),
|
|
(unsigned int)file_id));
|
|
|
|
fsp = initial_break_processing(sconn, id, file_id);
|
|
|
|
if (fsp == NULL) {
|
|
DEBUG(3, ("Got a kernel oplock break message for a file "
|
|
"I don't know about\n"));
|
|
return;
|
|
}
|
|
|
|
if (fsp->sent_oplock_break != NO_BREAK_SENT) {
|
|
/* This is ok, kernel oplocks come in completely async */
|
|
DEBUG(3, ("Got a kernel oplock request while waiting for a "
|
|
"break reply\n"));
|
|
return;
|
|
}
|
|
|
|
if (sconn->using_smb2) {
|
|
send_break_message_smb2(fsp, OPLOCKLEVEL_NONE);
|
|
} else {
|
|
send_break_message_smb1(fsp, OPLOCKLEVEL_NONE);
|
|
}
|
|
|
|
fsp->sent_oplock_break = BREAK_TO_NONE_SENT;
|
|
|
|
add_oplock_timeout_handler(fsp);
|
|
}
|
|
|
|
void reply_to_oplock_break_requests(files_struct *fsp)
|
|
{
|
|
struct smbd_server_connection *sconn = fsp->conn->sconn;
|
|
struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
|
|
int i;
|
|
|
|
/*
|
|
* If kernel oplocks already notifies smbds when oplocks are
|
|
* broken/removed, just return.
|
|
*/
|
|
if (koplocks &&
|
|
(koplocks->flags & KOPLOCKS_OPLOCK_BROKEN_NOTIFICATION)) {
|
|
return;
|
|
}
|
|
|
|
for (i=0; i<fsp->num_pending_break_messages; i++) {
|
|
struct share_mode_entry *e = &fsp->pending_break_messages[i];
|
|
char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
|
|
|
|
share_mode_entry_to_message(msg, e);
|
|
|
|
messaging_send_buf(fsp->conn->sconn->msg_ctx, e->pid,
|
|
MSG_SMB_BREAK_RESPONSE,
|
|
(uint8 *)msg,
|
|
MSG_SMB_SHARE_MODE_ENTRY_SIZE);
|
|
}
|
|
|
|
SAFE_FREE(fsp->pending_break_messages);
|
|
fsp->num_pending_break_messages = 0;
|
|
TALLOC_FREE(fsp->oplock_timeout);
|
|
return;
|
|
}
|
|
|
|
static void process_oplock_break_response(struct messaging_context *msg_ctx,
|
|
void *private_data,
|
|
uint32_t msg_type,
|
|
struct server_id src,
|
|
DATA_BLOB *data)
|
|
{
|
|
struct share_mode_entry msg;
|
|
struct smbd_server_connection *sconn =
|
|
talloc_get_type_abort(private_data,
|
|
struct smbd_server_connection);
|
|
|
|
if (data->data == NULL) {
|
|
DEBUG(0, ("Got NULL buffer\n"));
|
|
return;
|
|
}
|
|
|
|
if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
|
|
DEBUG(0, ("Got invalid msg len %u\n",
|
|
(unsigned int)data->length));
|
|
return;
|
|
}
|
|
|
|
/* De-linearize incoming message. */
|
|
message_to_share_mode_entry(&msg, (char *)data->data);
|
|
|
|
DEBUG(10, ("Got oplock break response from pid %s: %s/%llu mid %llu\n",
|
|
server_id_str(talloc_tos(), &src),
|
|
file_id_string_tos(&msg.id),
|
|
(unsigned long long)msg.share_file_id,
|
|
(unsigned long long)msg.op_mid));
|
|
|
|
schedule_deferred_open_message_smb(sconn, msg.op_mid);
|
|
}
|
|
|
|
static void process_open_retry_message(struct messaging_context *msg_ctx,
|
|
void *private_data,
|
|
uint32_t msg_type,
|
|
struct server_id src,
|
|
DATA_BLOB *data)
|
|
{
|
|
struct share_mode_entry msg;
|
|
struct smbd_server_connection *sconn =
|
|
talloc_get_type_abort(private_data,
|
|
struct smbd_server_connection);
|
|
|
|
if (data->data == NULL) {
|
|
DEBUG(0, ("Got NULL buffer\n"));
|
|
return;
|
|
}
|
|
|
|
if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
|
|
DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
|
|
return;
|
|
}
|
|
|
|
/* De-linearize incoming message. */
|
|
message_to_share_mode_entry(&msg, (char *)data->data);
|
|
|
|
DEBUG(10, ("Got open retry msg from pid %s: %s mid %llu\n",
|
|
server_id_str(talloc_tos(), &src), file_id_string_tos(&msg.id),
|
|
(unsigned long long)msg.op_mid));
|
|
|
|
schedule_deferred_open_message_smb(sconn, msg.op_mid);
|
|
}
|
|
|
|
struct break_to_none_state {
|
|
struct smbd_server_connection *sconn;
|
|
struct file_id id;
|
|
};
|
|
static void do_break_to_none(struct tevent_req *req);
|
|
|
|
/****************************************************************************
|
|
This function is called on any file modification or lock request. If a file
|
|
is level 2 oplocked then it must tell all other level 2 holders to break to
|
|
none.
|
|
****************************************************************************/
|
|
|
|
static void contend_level2_oplocks_begin_default(files_struct *fsp,
|
|
enum level2_contention_type type)
|
|
{
|
|
struct smbd_server_connection *sconn = fsp->conn->sconn;
|
|
struct tevent_req *req;
|
|
struct break_to_none_state *state;
|
|
|
|
/*
|
|
* If this file is level II oplocked then we need
|
|
* to grab the shared memory lock and inform all
|
|
* other files with a level II lock that they need
|
|
* to flush their read caches. We keep the lock over
|
|
* the shared memory area whilst doing this.
|
|
*/
|
|
|
|
if (!LEVEL_II_OPLOCK_TYPE(fsp->oplock_type))
|
|
return;
|
|
|
|
/*
|
|
* When we get here we might have a brlock entry locked. Also
|
|
* locking the share mode entry would violate the locking
|
|
* order. Breaking level2 oplocks to none is asynchronous
|
|
* anyway, so we postpone this into an immediate timed event.
|
|
*/
|
|
|
|
state = talloc(sconn, struct break_to_none_state);
|
|
if (state == NULL) {
|
|
DEBUG(1, ("talloc failed\n"));
|
|
return;
|
|
}
|
|
state->sconn = sconn;
|
|
state->id = fsp->file_id;
|
|
|
|
req = tevent_wakeup_send(state, sconn->ev_ctx, timeval_set(0, 0));
|
|
if (req == NULL) {
|
|
DEBUG(1, ("tevent_wakeup_send failed\n"));
|
|
TALLOC_FREE(state);
|
|
return;
|
|
}
|
|
tevent_req_set_callback(req, do_break_to_none, state);
|
|
return;
|
|
}
|
|
|
|
static void do_break_to_none(struct tevent_req *req)
|
|
{
|
|
struct break_to_none_state *state = tevent_req_callback_data(
|
|
req, struct break_to_none_state);
|
|
struct server_id self = messaging_server_id(state->sconn->msg_ctx);
|
|
bool ret;
|
|
int i;
|
|
struct share_mode_lock *lck;
|
|
|
|
ret = tevent_wakeup_recv(req);
|
|
TALLOC_FREE(req);
|
|
if (!ret) {
|
|
DEBUG(1, ("tevent_wakeup_recv failed\n"));
|
|
goto done;
|
|
}
|
|
lck = get_existing_share_mode_lock(talloc_tos(), state->id);
|
|
if (lck == NULL) {
|
|
DEBUG(1, ("release_level_2_oplocks_on_change: failed to lock "
|
|
"share mode entry for file %s.\n",
|
|
file_id_string_tos(&state->id)));
|
|
goto done;
|
|
}
|
|
|
|
DEBUG(10,("release_level_2_oplocks_on_change: num_share_modes = %d\n",
|
|
lck->data->num_share_modes ));
|
|
|
|
for(i = 0; i < lck->data->num_share_modes; i++) {
|
|
struct share_mode_entry *share_entry = &lck->data->share_modes[i];
|
|
char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
|
|
|
|
if (!is_valid_share_mode_entry(share_entry)) {
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* As there could have been multiple writes waiting at the
|
|
* lock_share_entry gate we may not be the first to
|
|
* enter. Hence the state of the op_types in the share mode
|
|
* entries may be partly NO_OPLOCK and partly LEVEL_II or FAKE_LEVEL_II
|
|
* oplock. It will do no harm to re-send break messages to
|
|
* those smbd's that are still waiting their turn to remove
|
|
* their LEVEL_II state, and also no harm to ignore existing
|
|
* NO_OPLOCK states. JRA.
|
|
*/
|
|
|
|
DEBUG(10,("release_level_2_oplocks_on_change: "
|
|
"share_entry[%i]->op_type == %d\n",
|
|
i, share_entry->op_type ));
|
|
|
|
if (share_entry->op_type == NO_OPLOCK) {
|
|
continue;
|
|
}
|
|
|
|
/* Paranoia .... */
|
|
if (EXCLUSIVE_OPLOCK_TYPE(share_entry->op_type)) {
|
|
DEBUG(0,("release_level_2_oplocks_on_change: PANIC. "
|
|
"share mode entry %d is an exlusive "
|
|
"oplock !\n", i ));
|
|
TALLOC_FREE(lck);
|
|
abort();
|
|
}
|
|
|
|
share_mode_entry_to_message(msg, share_entry);
|
|
|
|
/*
|
|
* Deal with a race condition when breaking level2
|
|
* oplocks. Don't send all the messages and release
|
|
* the lock, this allows someone else to come in and
|
|
* get a level2 lock before any of the messages are
|
|
* processed, and thus miss getting a break message.
|
|
* Ensure at least one entry (the one we're breaking)
|
|
* is processed immediately under the lock and becomes
|
|
* set as NO_OPLOCK to stop any waiter getting a level2.
|
|
* Bugid #5980.
|
|
*/
|
|
|
|
if (serverid_equal(&self, &share_entry->pid)) {
|
|
struct files_struct *cur_fsp =
|
|
initial_break_processing(state->sconn,
|
|
share_entry->id,
|
|
share_entry->share_file_id);
|
|
wait_before_sending_break();
|
|
if (cur_fsp != NULL) {
|
|
break_level2_to_none_async(cur_fsp);
|
|
} else {
|
|
DEBUG(3, ("release_level_2_oplocks_on_change: "
|
|
"Did not find fsp, ignoring\n"));
|
|
}
|
|
} else {
|
|
messaging_send_buf(state->sconn->msg_ctx,
|
|
share_entry->pid,
|
|
MSG_SMB_ASYNC_LEVEL2_BREAK,
|
|
(uint8 *)msg,
|
|
MSG_SMB_SHARE_MODE_ENTRY_SIZE);
|
|
}
|
|
}
|
|
|
|
/* We let the message receivers handle removing the oplock state
|
|
in the share mode lock db. */
|
|
|
|
TALLOC_FREE(lck);
|
|
done:
|
|
TALLOC_FREE(state);
|
|
return;
|
|
}
|
|
|
|
void smbd_contend_level2_oplocks_begin(files_struct *fsp,
|
|
enum level2_contention_type type)
|
|
{
|
|
struct smbd_server_connection *sconn = fsp->conn->sconn;
|
|
struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
|
|
|
|
if (koplocks && koplocks->ops->contend_level2_oplocks_begin) {
|
|
koplocks->ops->contend_level2_oplocks_begin(fsp, type);
|
|
return;
|
|
}
|
|
|
|
contend_level2_oplocks_begin_default(fsp, type);
|
|
}
|
|
|
|
void smbd_contend_level2_oplocks_end(files_struct *fsp,
|
|
enum level2_contention_type type)
|
|
{
|
|
struct smbd_server_connection *sconn = fsp->conn->sconn;
|
|
struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
|
|
|
|
/* Only kernel oplocks implement this so far */
|
|
if (koplocks && koplocks->ops->contend_level2_oplocks_end) {
|
|
koplocks->ops->contend_level2_oplocks_end(fsp, type);
|
|
}
|
|
}
|
|
|
|
/****************************************************************************
|
|
Linearize a share mode entry struct to an internal oplock break message.
|
|
****************************************************************************/
|
|
|
|
void share_mode_entry_to_message(char *msg, const struct share_mode_entry *e)
|
|
{
|
|
SIVAL(msg,OP_BREAK_MSG_PID_OFFSET,(uint32)e->pid.pid);
|
|
SBVAL(msg,OP_BREAK_MSG_MID_OFFSET,e->op_mid);
|
|
SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET,e->op_type);
|
|
SIVAL(msg,OP_BREAK_MSG_ACCESS_MASK_OFFSET,e->access_mask);
|
|
SIVAL(msg,OP_BREAK_MSG_SHARE_ACCESS_OFFSET,e->share_access);
|
|
SIVAL(msg,OP_BREAK_MSG_PRIV_OFFSET,e->private_options);
|
|
SIVAL(msg,OP_BREAK_MSG_TIME_SEC_OFFSET,(uint32_t)e->time.tv_sec);
|
|
SIVAL(msg,OP_BREAK_MSG_TIME_USEC_OFFSET,(uint32_t)e->time.tv_usec);
|
|
push_file_id_24(msg+OP_BREAK_MSG_DEV_OFFSET, &e->id);
|
|
SIVAL(msg,OP_BREAK_MSG_FILE_ID_OFFSET,e->share_file_id);
|
|
SIVAL(msg,OP_BREAK_MSG_UID_OFFSET,e->uid);
|
|
SSVAL(msg,OP_BREAK_MSG_FLAGS_OFFSET,e->flags);
|
|
SIVAL(msg,OP_BREAK_MSG_NAME_HASH_OFFSET,e->name_hash);
|
|
SIVAL(msg,OP_BREAK_MSG_VNN_OFFSET,e->pid.vnn);
|
|
}
|
|
|
|
/****************************************************************************
|
|
De-linearize an internal oplock break message to a share mode entry struct.
|
|
****************************************************************************/
|
|
|
|
void message_to_share_mode_entry(struct share_mode_entry *e, char *msg)
|
|
{
|
|
e->pid.pid = (pid_t)IVAL(msg,OP_BREAK_MSG_PID_OFFSET);
|
|
e->op_mid = BVAL(msg,OP_BREAK_MSG_MID_OFFSET);
|
|
e->op_type = SVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET);
|
|
e->access_mask = IVAL(msg,OP_BREAK_MSG_ACCESS_MASK_OFFSET);
|
|
e->share_access = IVAL(msg,OP_BREAK_MSG_SHARE_ACCESS_OFFSET);
|
|
e->private_options = IVAL(msg,OP_BREAK_MSG_PRIV_OFFSET);
|
|
e->time.tv_sec = (time_t)IVAL(msg,OP_BREAK_MSG_TIME_SEC_OFFSET);
|
|
e->time.tv_usec = (int)IVAL(msg,OP_BREAK_MSG_TIME_USEC_OFFSET);
|
|
pull_file_id_24(msg+OP_BREAK_MSG_DEV_OFFSET, &e->id);
|
|
e->share_file_id = (unsigned long)IVAL(msg,OP_BREAK_MSG_FILE_ID_OFFSET);
|
|
e->uid = (uint32)IVAL(msg,OP_BREAK_MSG_UID_OFFSET);
|
|
e->flags = (uint16)SVAL(msg,OP_BREAK_MSG_FLAGS_OFFSET);
|
|
e->name_hash = IVAL(msg,OP_BREAK_MSG_NAME_HASH_OFFSET);
|
|
e->pid.vnn = IVAL(msg,OP_BREAK_MSG_VNN_OFFSET);
|
|
}
|
|
|
|
/****************************************************************************
|
|
Setup oplocks for this process.
|
|
****************************************************************************/
|
|
|
|
bool init_oplocks(struct smbd_server_connection *sconn)
|
|
{
|
|
DEBUG(3,("init_oplocks: initializing messages.\n"));
|
|
|
|
messaging_register(sconn->msg_ctx, sconn, MSG_SMB_BREAK_REQUEST,
|
|
process_oplock_break_message);
|
|
messaging_register(sconn->msg_ctx, sconn, MSG_SMB_ASYNC_LEVEL2_BREAK,
|
|
process_oplock_async_level2_break_message);
|
|
messaging_register(sconn->msg_ctx, sconn, MSG_SMB_BREAK_RESPONSE,
|
|
process_oplock_break_response);
|
|
messaging_register(sconn->msg_ctx, sconn, MSG_SMB_KERNEL_BREAK,
|
|
process_kernel_oplock_break);
|
|
messaging_register(sconn->msg_ctx, sconn, MSG_SMB_OPEN_RETRY,
|
|
process_open_retry_message);
|
|
|
|
return true;
|
|
}
|
|
|
|
void init_kernel_oplocks(struct smbd_server_connection *sconn)
|
|
{
|
|
struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
|
|
|
|
/* only initialize once */
|
|
if (koplocks == NULL) {
|
|
#if HAVE_KERNEL_OPLOCKS_IRIX
|
|
koplocks = irix_init_kernel_oplocks(sconn);
|
|
#elif HAVE_KERNEL_OPLOCKS_LINUX
|
|
koplocks = linux_init_kernel_oplocks(sconn);
|
|
#endif
|
|
sconn->oplocks.kernel_ops = koplocks;
|
|
}
|
|
}
|