+++ /dev/null
-/*
- * Unix SMB/CIFS implementation.
- * Support for OneFS system interfaces.
- *
- * Copyright (C) Zack Kirsch, 2009
- *
- * 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 "onefs.h"
-
-#include <ifs/ifs_syscalls.h>
-#include <sys/isi_cifs_brl.h>
-#include <isi_ecs/isi_ecs_cbrl.h>
-
-#undef DBGC_CLASS
-#define DBGC_CLASS DBGC_LOCKING
-
-extern struct blocking_lock_record *blocking_lock_queue;
-
-static uint64_t onefs_get_new_id(void) {
- static uint64_t id = 0;
-
- id++;
-
- return id;
-}
-
-enum onefs_cbrl_lock_state {ONEFS_CBRL_NONE, ONEFS_CBRL_ASYNC, ONEFS_CBRL_DONE,
- ONEFS_CBRL_ERROR};
-
-struct onefs_cbrl_blr_state {
- uint64_t id;
- enum onefs_cbrl_lock_state state;
-};
-
-static char *onefs_cbrl_blr_state_str(const struct blocking_lock_record *blr)
-{
- static fstring result;
- struct onefs_cbrl_blr_state *bs;
-
- SMB_ASSERT(blr);
-
- bs = (struct onefs_cbrl_blr_state *)blr->blr_private;
-
- if (bs == NULL) {
- fstrcpy(result, "NULL CBRL BLR state - Posix lock?");
- return result;
- }
-
- switch (bs->state) {
- case ONEFS_CBRL_NONE:
- fstr_sprintf(result, "CBRL BLR id=%llu: state=NONE", bs->id);
- break;
- case ONEFS_CBRL_ASYNC:
- fstr_sprintf(result, "CBRL BLR id=%llu: state=ASYNC", bs->id);
- break;
- case ONEFS_CBRL_DONE:
- fstr_sprintf(result, "CBRL BLR id=%llu: state=DONE", bs->id);
- break;
- case ONEFS_CBRL_ERROR:
- fstr_sprintf(result, "CBRL BLR id=%llu: state=ERROR", bs->id);
- break;
- default:
- fstr_sprintf(result, "CBRL BLR id=%llu: unknown state %d",
- bs->id, bs->state);
- break;
- }
-
- return result;
-}
-
-static void onefs_cbrl_enumerate_blq(const char *fn)
-{
- struct blocking_lock_record *blr;
-
- if (DEBUGLVL(10))
- return;
-
- DEBUG(10, ("CBRL BLR records (%s):\n", fn));
-
- for (blr = blocking_lock_queue; blr; blr = blr->next)
- DEBUGADD(10, ("%s\n", onefs_cbrl_blr_state_str(blr)));
-}
-
-static struct blocking_lock_record *onefs_cbrl_find_blr(uint64_t id)
-{
- struct blocking_lock_record *blr;
- struct onefs_cbrl_blr_state *bs;
-
- onefs_cbrl_enumerate_blq("onefs_cbrl_find_blr");
-
- for (blr = blocking_lock_queue; blr; blr = blr->next) {
- bs = (struct onefs_cbrl_blr_state *)blr->blr_private;
-
- /* We don't control all of the BLRs on the BLQ. */
- if (bs == NULL)
- continue;
-
- if (bs->id == id) {
- DEBUG(10, ("found %s\n",
- onefs_cbrl_blr_state_str(blr)));
- break;
- }
- }
-
- if (blr == NULL) {
- DEBUG(5, ("Could not find CBRL BLR for id %llu\n", id));
- return NULL;
- }
-
- return blr;
-}
-
-static void onefs_cbrl_async_success(uint64_t id)
-{
- struct blocking_lock_record *blr;
- struct onefs_cbrl_blr_state *bs;
- uint16 num_locks;
-
- DEBUG(10, ("CBRL async success!\n"));
-
- /* Find BLR with id. Its okay not to find one (race with cancel) */
- blr = onefs_cbrl_find_blr(id);
- if (blr == NULL)
- return;
-
- bs = (struct onefs_cbrl_blr_state *)blr->blr_private;
- SMB_ASSERT(bs);
- SMB_ASSERT(bs->state == ONEFS_CBRL_ASYNC);
-
- blr->lock_num++;
-
- num_locks = SVAL(blr->req->vwv+7, 0);
-
- if (blr->lock_num == num_locks)
- bs->state = ONEFS_CBRL_DONE;
- else
- bs->state = ONEFS_CBRL_NONE;
-
- /* Process the queue, to try the next lock or finish up. */
- process_blocking_lock_queue();
-}
-
-static void onefs_cbrl_async_failure(uint64_t id)
-{
- struct blocking_lock_record *blr;
- struct onefs_cbrl_blr_state *bs;
-
- DEBUG(10, ("CBRL async failure!\n"));
-
- /* Find BLR with id. Its okay not to find one (race with cancel) */
- blr = onefs_cbrl_find_blr(id);
- if (blr == NULL)
- return;
-
- bs = (struct onefs_cbrl_blr_state *)blr->blr_private;
- SMB_ASSERT(bs);
-
- SMB_ASSERT(bs->state == ONEFS_CBRL_ASYNC);
- bs->state = ONEFS_CBRL_ERROR;
-
- /* Process the queue. It will end up trying to retake the same lock,
- * see the error in onefs_cbrl_lock_windows() and fail. */
- process_blocking_lock_queue();
-}
-
-static struct cbrl_event_ops cbrl_ops =
- {.cbrl_async_success = onefs_cbrl_async_success,
- .cbrl_async_failure = onefs_cbrl_async_failure};
-
-static void onefs_cbrl_events_handler(struct event_context *ev,
- struct fd_event *fde,
- uint16_t flags,
- void *private_data)
-{
- DEBUG(10, ("onefs_cbrl_events_handler\n"));
-
- if (cbrl_event_dispatcher(&cbrl_ops)) {
- DEBUG(0, ("cbrl_event_dispatcher failed: %s\n",
- strerror(errno)));
- }
-}
-
-static void onefs_init_cbrl(void)
-{
- static bool init_done = false;
- static int cbrl_event_fd;
- static struct fd_event *cbrl_fde;
-
- if (init_done)
- return;
-
- DEBUG(10, ("onefs_init_cbrl\n"));
-
- /* Register the event channel for CBRL. */
- cbrl_event_fd = cbrl_event_register();
- if (cbrl_event_fd == -1) {
- DEBUG(0, ("cbrl_event_register failed: %s\n",
- strerror(errno)));
- return;
- }
-
- DEBUG(10, ("cbrl_event_fd = %d\n", cbrl_event_fd));
-
- /* Register the oplock event_fd with samba's event system */
- cbrl_fde = event_add_fd(smbd_event_context(),
- NULL,
- cbrl_event_fd,
- EVENT_FD_READ,
- onefs_cbrl_events_handler,
- NULL);
-
- init_done = true;
- return;
-}
-
-/**
- * Blocking PID. As far as I can tell, the blocking_pid is only used to tell
- * whether a posix lock or a CIFS lock blocked us. If it was a posix lock,
- * Samba polls every 10 seconds, which we don't want. -zkirsch
- */
-#define ONEFS_BLOCKING_PID 0xABCDABCD
-
-/**
- * @param[in] br_lck Contains the fsp.
- * @param[in] plock Lock request.
- * @param[in] blocking_lock Only used for figuring out the error.
- * @param[in,out] blr The BLR for the already-deferred operation.
- */
-NTSTATUS onefs_brl_lock_windows(vfs_handle_struct *handle,
- struct byte_range_lock *br_lck,
- struct lock_struct *plock,
- bool blocking_lock,
- struct blocking_lock_record *blr)
-{
- int fd = br_lck->fsp->fh->fd;
- uint64_t id = 0;
- bool exclusive = false;
- bool async = false;
- bool pending = false;
- bool pending_async = false;
- int error;
- struct onefs_cbrl_blr_state *bs;
- NTSTATUS status;
-
- SMB_ASSERT(plock->lock_flav == WINDOWS_LOCK);
- SMB_ASSERT(plock->lock_type != UNLOCK_LOCK);
-
- onefs_cbrl_enumerate_blq("onefs_brl_lock_windows");
-
- /* Will only initialize the first time its called. */
- onefs_init_cbrl();
-
- switch (plock->lock_type) {
- case WRITE_LOCK:
- exclusive = true;
- break;
- case READ_LOCK:
- break;
- case PENDING_WRITE_LOCK:
- /* Called when a blocking lock request is added - do an
- * async lock. */
- pending = true;
- async = true;
- exclusive = true;
- break;
- case PENDING_READ_LOCK:
- /* Called when a blocking lock request is added - do an
- * async lock. */
- pending = true;
- async = true;
- break;
- default:
- /* UNLOCK_LOCK: should only be used for a POSIX_LOCK */
- smb_panic("Invalid plock->lock_type passed in to "
- "onefs_brl_lock_windows");
- }
-
- /* Figure out if we're actually doing the lock or a no-op. We need to
- * do a no-op when process_blocking_lock_queue calls back into us.
- *
- * We know process_* is calling into us if a blr is passed in and
- * pending is false. */
- if (!pending && blr) {
- /* Check the BLR state. */
- bs = (struct onefs_cbrl_blr_state *)blr->blr_private;
- SMB_ASSERT(bs);
-
- /* ASYNC still in progress: The process_* calls will keep
- * calling even if we haven't gotten the lock. Keep erroring
- * without calling ifs_cbrl, or getting/setting an id. */
- if (bs->state == ONEFS_CBRL_ASYNC)
- goto failure;
- else if (bs->state == ONEFS_CBRL_ERROR)
- return NT_STATUS_NO_MEMORY;
-
- SMB_ASSERT(bs->state == ONEFS_CBRL_NONE);
- async = true;
- }
-
- if (async) {
- SMB_ASSERT(blocking_lock);
- SMB_ASSERT(blr);
- id = onefs_get_new_id();
- }
-
- DEBUG(10, ("Calling ifs_cbrl(LOCK)..."));
- error = ifs_cbrl(fd, CBRL_OP_LOCK, exclusive, plock->start,
- plock->size, async, id, plock->context.smbpid, plock->context.tid);
- if (!error) {
- goto success;
- } else if (errno == EWOULDBLOCK) {
- SMB_ASSERT(!async);
- } else if (errno == EINPROGRESS) {
- SMB_ASSERT(async);
-
- if (pending) {
- /* Talloc a new BLR private state. */
- blr->blr_private = talloc(blr, struct onefs_cbrl_blr_state);
- pending_async = true;
- }
-
- /* Store the new id in the BLR private state. */
- bs = (struct onefs_cbrl_blr_state *)blr->blr_private;
- bs->id = id;
- bs->state = ONEFS_CBRL_ASYNC;
- } else {
- DEBUG(0, ("onefs_brl_lock_windows failure: error=%d (%s).\n",
- errno, strerror(errno)));
- }
-
-failure:
- /* Failure - error or async. */
- plock->context.smbpid = (uint32) ONEFS_BLOCKING_PID;
-
- if (pending_async)
- status = NT_STATUS_OK;
- else
- status = brl_lock_failed(br_lck->fsp, plock, blocking_lock);
-
- DEBUG(10, ("returning %s.\n", nt_errstr(status)));
- return status;
-
-success:
- /* Success. */
- onefs_cbrl_enumerate_blq("onefs_brl_unlock_windows");
- DEBUG(10, ("returning NT_STATUS_OK.\n"));
- return NT_STATUS_OK;
-}
-
-#define CBRL_NOTYPE true
-
-bool onefs_brl_unlock_windows(vfs_handle_struct *handle,
- struct messaging_context *msg_ctx,
- struct byte_range_lock *br_lck,
- const struct lock_struct *plock)
-{
- int error;
- int fd = br_lck->fsp->fh->fd;
-
- SMB_ASSERT(plock->lock_flav == WINDOWS_LOCK);
- SMB_ASSERT(plock->lock_type == UNLOCK_LOCK);
-
- DEBUG(10, ("Calling ifs_cbrl(UNLOCK)..."));
- error = ifs_cbrl(fd, CBRL_OP_UNLOCK, CBRL_NOTYPE,
- plock->start, plock->size, CBRL_NOTYPE, 0, plock->context.smbpid,
- plock->context.tid);
- if (error) {
- DEBUG(10, ("returning false.\n"));
- return false;
- }
-
- DEBUG(10, ("returning true.\n"));
- return true;
-
- /* Problem with storing things in TDB: I won't know what BRL to unlock in the TDB.
- * - I could fake it?
- * - I could send Samba a message with which lock is being unlocked?
- * - I could *easily* make the "id" something you always pass in to
- * lock, unlock or cancel -- it identifies a lock. Makes sense!
- */
-}
-
-/* Default implementation only calls this on PENDING locks. */
-bool onefs_brl_cancel_windows(vfs_handle_struct *handle,
- struct byte_range_lock *br_lck,
- struct lock_struct *plock,
- struct blocking_lock_record *blr)
-{
- int error;
- int fd = br_lck->fsp->fh->fd;
- struct onefs_cbrl_blr_state *bs;
-
- SMB_ASSERT(plock);
- SMB_ASSERT(plock->lock_flav == WINDOWS_LOCK);
- SMB_ASSERT(blr);
-
- onefs_cbrl_enumerate_blq("onefs_brl_cancel_windows");
-
- bs = ((struct onefs_cbrl_blr_state *)blr->blr_private);
- SMB_ASSERT(bs);
-
- if (bs->state == ONEFS_CBRL_DONE) {
- /* No-op. */
- DEBUG(10, ("State=DONE, returning true\n"));
- return true;
- }
-
- SMB_ASSERT(bs->state == ONEFS_CBRL_NONE ||
- bs->state == ONEFS_CBRL_ASYNC);
-
- /* A real cancel. */
- DEBUG(10, ("Calling ifs_cbrl(CANCEL)..."));
- error = ifs_cbrl(fd, CBRL_OP_CANCEL, CBRL_NOTYPE, plock->start,
- plock->size, CBRL_NOTYPE, bs->id, plock->context.smbpid,
- plock->context.tid);
- if (error) {
- DEBUG(10, ("returning false\n"));
- bs->state = ONEFS_CBRL_ERROR;
- return false;
- }
-
- bs->state = ONEFS_CBRL_DONE;
- onefs_cbrl_enumerate_blq("onefs_brl_cancel_windows");
- DEBUG(10, ("returning true\n"));
- return true;
-}
-
-/* TODO Optimization: Abstract out brl_get_locks() in the Windows case.
- * We'll malloc some memory or whatever (can't return NULL), but not actually
- * touch the TDB. */
-
-/* XXX brl_locktest: CBRL does not support calling this, but its only for
- * strict locking. Add empty VOP? */
-
-/* XXX brl_lockquery: CBRL does not support calling this for WINDOWS LOCKS, but
- * its only called for POSIX LOCKS. Add empty VOP? */
-
-/* XXX brl_close_fnum: CBRL will do this automatically. I think this is a NO-OP
- * for us, we could add an empty VOP. */
-
git.samba.org / samba.git / blobdiff