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 2 of the License, or
+ 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,
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, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-#include "include/includes.h"
+#include "includes.h"
#include "vfs_posix.h"
+#include "system/time.h"
+#include "../lib/util/dlinklist.h"
+#include "messaging/messaging.h"
/*
*/
NTSTATUS pvfs_check_lock(struct pvfs_state *pvfs,
struct pvfs_file *f,
- uint16_t smbpid,
+ uint32_t smbpid,
uint64_t offset, uint64_t count,
enum brl_type rw)
{
}
return brl_locktest(pvfs->brl_context,
- &f->locking_key,
- f->fnum,
+ f->brl_handle,
smbpid,
offset, count, rw);
}
+/* this state structure holds information about a lock we are waiting on */
+struct pvfs_pending_lock {
+ struct pvfs_pending_lock *next, *prev;
+ struct pvfs_state *pvfs;
+ union smb_lock *lck;
+ struct pvfs_file *f;
+ struct ntvfs_request *req;
+ int pending_lock;
+ struct pvfs_wait *wait_handle;
+ struct timeval end_time;
+};
+
+/*
+ a secondary attempt to setup a lock has failed - back out
+ the locks we did get and send an error
+*/
+static void pvfs_lock_async_failed(struct pvfs_state *pvfs,
+ struct ntvfs_request *req,
+ struct pvfs_file *f,
+ struct smb_lock_entry *locks,
+ int i,
+ NTSTATUS status)
+{
+ /* undo the locks we just did */
+ for (i--;i>=0;i--) {
+ brl_unlock(pvfs->brl_context,
+ f->brl_handle,
+ locks[i].pid,
+ locks[i].offset,
+ locks[i].count);
+ f->lock_count--;
+ }
+ req->async_states->status = status;
+ req->async_states->send_fn(req);
+}
+
+
+/*
+ called when we receive a pending lock notification. It means that
+ either our lock timed out or someone else has unlocked a overlapping
+ range, so we should try the lock again. Note that on timeout we
+ do retry the lock, giving it a last chance.
+*/
+static void pvfs_pending_lock_continue(void *private_data, enum pvfs_wait_notice reason)
+{
+ struct pvfs_pending_lock *pending = talloc_get_type(private_data,
+ struct pvfs_pending_lock);
+ struct pvfs_state *pvfs = pending->pvfs;
+ struct pvfs_file *f = pending->f;
+ struct ntvfs_request *req = pending->req;
+ union smb_lock *lck = pending->lck;
+ struct smb_lock_entry *locks;
+ enum brl_type rw;
+ NTSTATUS status;
+ int i;
+ bool timed_out;
+
+ timed_out = (reason != PVFS_WAIT_EVENT);
+
+ locks = lck->lockx.in.locks + lck->lockx.in.ulock_cnt;
+
+ if (lck->lockx.in.mode & LOCKING_ANDX_SHARED_LOCK) {
+ rw = READ_LOCK;
+ } else {
+ rw = WRITE_LOCK;
+ }
+
+ DLIST_REMOVE(f->pending_list, pending);
+
+ /* we don't retry on a cancel */
+ if (reason == PVFS_WAIT_CANCEL) {
+ if (pvfs->ntvfs->ctx->protocol != PROTOCOL_SMB2) {
+ status = NT_STATUS_FILE_LOCK_CONFLICT;
+ } else {
+ status = NT_STATUS_CANCELLED;
+ }
+ } else {
+ /*
+ * here it's important to pass the pending pointer
+ * because with this we'll get the correct error code
+ * FILE_LOCK_CONFLICT in the error case
+ */
+ status = brl_lock(pvfs->brl_context,
+ f->brl_handle,
+ locks[pending->pending_lock].pid,
+ locks[pending->pending_lock].offset,
+ locks[pending->pending_lock].count,
+ rw, pending);
+ }
+ if (NT_STATUS_IS_OK(status)) {
+ f->lock_count++;
+ timed_out = false;
+ }
+
+ /* if we have failed and timed out, or succeeded, then we
+ don't need the pending lock any more */
+ if (NT_STATUS_IS_OK(status) || timed_out) {
+ NTSTATUS status2;
+ status2 = brl_remove_pending(pvfs->brl_context,
+ f->brl_handle, pending);
+ if (!NT_STATUS_IS_OK(status2)) {
+ DEBUG(0,("pvfs_lock: failed to remove pending lock - %s\n", nt_errstr(status2)));
+ }
+ talloc_free(pending->wait_handle);
+ }
+
+ if (!NT_STATUS_IS_OK(status)) {
+ if (timed_out) {
+ /* no more chances */
+ pvfs_lock_async_failed(pvfs, req, f, locks, pending->pending_lock, status);
+ talloc_free(pending);
+ } else {
+ /* we can try again */
+ DLIST_ADD(f->pending_list, pending);
+ }
+ return;
+ }
+
+ /* if we haven't timed out yet, then we can do more pending locks */
+ if (rw == READ_LOCK) {
+ rw = PENDING_READ_LOCK;
+ } else {
+ rw = PENDING_WRITE_LOCK;
+ }
+
+ /* we've now got the pending lock. try and get the rest, which might
+ lead to more pending locks */
+ for (i=pending->pending_lock+1;i<lck->lockx.in.lock_cnt;i++) {
+ if (pending) {
+ pending->pending_lock = i;
+ }
+
+ status = brl_lock(pvfs->brl_context,
+ f->brl_handle,
+ locks[i].pid,
+ locks[i].offset,
+ locks[i].count,
+ rw, pending);
+ if (!NT_STATUS_IS_OK(status)) {
+ if (pending) {
+ /* a timed lock failed - setup a wait message to handle
+ the pending lock notification or a timeout */
+ pending->wait_handle = pvfs_wait_message(pvfs, req, MSG_BRL_RETRY,
+ pending->end_time,
+ pvfs_pending_lock_continue,
+ pending);
+ if (pending->wait_handle == NULL) {
+ pvfs_lock_async_failed(pvfs, req, f, locks, i, NT_STATUS_NO_MEMORY);
+ talloc_free(pending);
+ } else {
+ talloc_steal(pending, pending->wait_handle);
+ DLIST_ADD(f->pending_list, pending);
+ }
+ return;
+ }
+ pvfs_lock_async_failed(pvfs, req, f, locks, i, status);
+ talloc_free(pending);
+ return;
+ }
+
+ f->lock_count++;
+ }
+
+ /* we've managed to get all the locks. Tell the client */
+ req->async_states->status = NT_STATUS_OK;
+ req->async_states->send_fn(req);
+ talloc_free(pending);
+}
+
+
+/*
+ called when we close a file that might have locks
+*/
+void pvfs_lock_close(struct pvfs_state *pvfs, struct pvfs_file *f)
+{
+ struct pvfs_pending_lock *p, *next;
+
+ if (f->lock_count || f->pending_list) {
+ DEBUG(5,("pvfs_lock: removing %.0f locks on close\n",
+ (double)f->lock_count));
+ brl_close(f->pvfs->brl_context, f->brl_handle);
+ f->lock_count = 0;
+ }
+
+ /* reply to all the pending lock requests, telling them the
+ lock failed */
+ for (p=f->pending_list;p;p=next) {
+ next = p->next;
+ DLIST_REMOVE(f->pending_list, p);
+ p->req->async_states->status = NT_STATUS_RANGE_NOT_LOCKED;
+ p->req->async_states->send_fn(p->req);
+ }
+}
+
+
+/*
+ cancel a set of locks
+*/
+static NTSTATUS pvfs_lock_cancel(struct pvfs_state *pvfs, struct ntvfs_request *req, union smb_lock *lck,
+ struct pvfs_file *f)
+{
+ struct pvfs_pending_lock *p;
+
+ for (p=f->pending_list;p;p=p->next) {
+ /* check if the lock request matches exactly - you can only cancel with exact matches */
+ if (p->lck->lockx.in.ulock_cnt == lck->lockx.in.ulock_cnt &&
+ p->lck->lockx.in.lock_cnt == lck->lockx.in.lock_cnt &&
+ p->lck->lockx.in.file.ntvfs== lck->lockx.in.file.ntvfs &&
+ p->lck->lockx.in.mode == (lck->lockx.in.mode & ~LOCKING_ANDX_CANCEL_LOCK)) {
+ int i;
+
+ for (i=0;i<lck->lockx.in.ulock_cnt + lck->lockx.in.lock_cnt;i++) {
+ if (p->lck->lockx.in.locks[i].pid != lck->lockx.in.locks[i].pid ||
+ p->lck->lockx.in.locks[i].offset != lck->lockx.in.locks[i].offset ||
+ p->lck->lockx.in.locks[i].count != lck->lockx.in.locks[i].count) {
+ break;
+ }
+ }
+ if (i < lck->lockx.in.ulock_cnt) continue;
+
+ /* an exact match! we can cancel it, which is equivalent
+ to triggering the timeout early */
+ pvfs_pending_lock_continue(p, PVFS_WAIT_TIMEOUT);
+ return NT_STATUS_OK;
+ }
+ }
+
+ return NT_STATUS_DOS(ERRDOS, ERRcancelviolation);
+}
+
+
/*
lock or unlock a byte range
*/
NTSTATUS pvfs_lock(struct ntvfs_module_context *ntvfs,
- struct smbsrv_request *req, union smb_lock *lck)
+ struct ntvfs_request *req, union smb_lock *lck)
{
- struct pvfs_state *pvfs = ntvfs->private_data;
+ struct pvfs_state *pvfs = talloc_get_type(ntvfs->private_data,
+ struct pvfs_state);
struct pvfs_file *f;
struct smb_lock_entry *locks;
int i;
enum brl_type rw;
+ struct pvfs_pending_lock *pending = NULL;
+ NTSTATUS status;
+
+ if (lck->generic.level != RAW_LOCK_GENERIC) {
+ return ntvfs_map_lock(ntvfs, req, lck);
+ }
- f = pvfs_find_fd(pvfs, req, lck->generic.in.fnum);
+ if (lck->lockx.in.mode & LOCKING_ANDX_OPLOCK_RELEASE) {
+ return pvfs_oplock_release(ntvfs, req, lck);
+ }
+
+ f = pvfs_find_fd(pvfs, req, lck->lockx.in.file.ntvfs);
if (!f) {
return NT_STATUS_INVALID_HANDLE;
}
- switch (lck->generic.level) {
- case RAW_LOCK_LOCK:
- return brl_lock(pvfs->brl_context,
- &f->locking_key,
- req->smbpid,
- f->fnum,
- lck->lock.in.offset,
- lck->lock.in.count,
- WRITE_LOCK);
-
- case RAW_LOCK_UNLOCK:
- return brl_unlock(pvfs->brl_context,
- &f->locking_key,
- req->smbpid,
- f->fnum,
- lck->lock.in.offset,
- lck->lock.in.count);
+ if (f->handle->fd == -1) {
+ return NT_STATUS_FILE_IS_A_DIRECTORY;
+ }
- case RAW_LOCK_GENERIC:
- return NT_STATUS_INVALID_LEVEL;
+ status = pvfs_break_level2_oplocks(f);
+ NT_STATUS_NOT_OK_RETURN(status);
- case RAW_LOCK_LOCKX:
- /* fall through to the most complex case */
- break;
- }
+ if (lck->lockx.in.timeout != 0 &&
+ (req->async_states->state & NTVFS_ASYNC_STATE_MAY_ASYNC)) {
+ pending = talloc(f, struct pvfs_pending_lock);
+ if (pending == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ pending->pvfs = pvfs;
+ pending->lck = lck;
+ pending->f = f;
+ pending->req = req;
- /* now the lockingX case, most common and also most complex */
+ pending->end_time =
+ timeval_current_ofs(lck->lockx.in.timeout/1000,
+ 1000*(lck->lockx.in.timeout%1000));
+ }
if (lck->lockx.in.mode & LOCKING_ANDX_SHARED_LOCK) {
- rw = READ_LOCK;
+ rw = pending? PENDING_READ_LOCK : READ_LOCK;
} else {
- rw = WRITE_LOCK;
+ rw = pending? PENDING_WRITE_LOCK : WRITE_LOCK;
}
- if (lck->lockx.in.mode &
- (LOCKING_ANDX_OPLOCK_RELEASE |
- LOCKING_ANDX_CHANGE_LOCKTYPE |
- LOCKING_ANDX_CANCEL_LOCK)) {
- /* todo: need to add support for these */
- return NT_STATUS_NOT_IMPLEMENTED;
+ if (lck->lockx.in.mode & LOCKING_ANDX_CANCEL_LOCK) {
+ talloc_free(pending);
+ return pvfs_lock_cancel(pvfs, req, lck, f);
}
+ if (lck->lockx.in.mode & LOCKING_ANDX_CHANGE_LOCKTYPE) {
+ /* this seems to not be supported by any windows server,
+ or used by any clients */
+ talloc_free(pending);
+ return NT_STATUS_DOS(ERRDOS, ERRnoatomiclocks);
+ }
/* the unlocks happen first */
locks = lck->lockx.in.locks;
for (i=0;i<lck->lockx.in.ulock_cnt;i++) {
- NTSTATUS status;
status = brl_unlock(pvfs->brl_context,
- &f->locking_key,
+ f->brl_handle,
locks[i].pid,
- f->fnum,
locks[i].offset,
locks[i].count);
if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(pending);
return status;
}
+ f->lock_count--;
}
locks += i;
for (i=0;i<lck->lockx.in.lock_cnt;i++) {
- NTSTATUS status;
+ if (pending) {
+ pending->pending_lock = i;
+ }
status = brl_lock(pvfs->brl_context,
- &f->locking_key,
+ f->brl_handle,
locks[i].pid,
- f->fnum,
locks[i].offset,
locks[i].count,
- rw);
+ rw, pending);
if (!NT_STATUS_IS_OK(status)) {
+ if (pending) {
+ /* a timed lock failed - setup a wait message to handle
+ the pending lock notification or a timeout */
+ pending->wait_handle = pvfs_wait_message(pvfs, req, MSG_BRL_RETRY,
+ pending->end_time,
+ pvfs_pending_lock_continue,
+ pending);
+ if (pending->wait_handle == NULL) {
+ talloc_free(pending);
+ return NT_STATUS_NO_MEMORY;
+ }
+ talloc_steal(pending, pending->wait_handle);
+ DLIST_ADD(f->pending_list, pending);
+ return NT_STATUS_OK;
+ }
+
/* undo the locks we just did */
- for (i=i-1;i>=0;i--) {
+ for (i--;i>=0;i--) {
brl_unlock(pvfs->brl_context,
- &f->locking_key,
+ f->brl_handle,
locks[i].pid,
- f->fnum,
locks[i].offset,
locks[i].count);
+ f->lock_count--;
}
+ talloc_free(pending);
return status;
}
+ f->lock_count++;
}
+ talloc_free(pending);
return NT_STATUS_OK;
}
-
git.samba.org / ira / wip.git / blobdiff