Unix SMB/CIFS implementation.
kernel oplock processing for Linux
Copyright (C) Andrew Tridgell 2000
-
+
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 "smbd/smbd.h"
#include "smbd/globals.h"
-#if HAVE_KERNEL_OPLOCKS_LINUX
+#ifdef HAVE_KERNEL_OPLOCKS_LINUX
#ifndef F_SETLEASE
#define F_SETLEASE 1024
#define F_GETLEASE 1025
#endif
-#ifndef CAP_LEASE
-#define CAP_LEASE 28
-#endif
-
#ifndef RT_SIGNAL_LEASE
#define RT_SIGNAL_LEASE (SIGRTMIN+1)
#endif
#define F_SETSIG 10
#endif
-/*
- * public function to get linux lease capability. Needed by some VFS modules (eg. gpfs.c)
- */
-void linux_set_lease_capability(void)
-{
- set_effective_capability(LEASE_CAPABILITY);
-}
-
/*
* Call to set the kernel lease signal handler
*/
int linux_setlease(int fd, int leasetype)
{
int ret;
+ int saved_errno;
+
+ /*
+ * Ensure the lease owner is root to allow
+ * correct delivery of lease-break signals.
+ */
+
+ become_root();
+ /* First set the signal handler. */
+ if (linux_set_lease_sighandler(fd) == -1) {
+ saved_errno = errno;
+ ret = -1;
+ goto out;
+ }
ret = fcntl(fd, F_SETLEASE, leasetype);
- if (ret == -1 && errno == EACCES) {
- set_effective_capability(LEASE_CAPABILITY);
- ret = fcntl(fd, F_SETLEASE, leasetype);
+ if (ret == -1) {
+ saved_errno = errno;
}
+ out:
+
+ unbecome_root();
+
+ if (ret == -1) {
+ errno = saved_errno;
+ }
return ret;
}
int signum, int count,
void *_info, void *private_data)
{
+ struct kernel_oplocks *ctx =
+ talloc_get_type_abort(private_data,
+ struct kernel_oplocks);
+ struct smbd_server_connection *sconn =
+ talloc_get_type_abort(ctx->private_data,
+ struct smbd_server_connection);
siginfo_t *info = (siginfo_t *)_info;
int fd = info->si_fd;
files_struct *fsp;
- fsp = file_find_fd(smbd_server_conn, fd);
+ fsp = file_find_fd(sconn, fd);
if (fsp == NULL) {
DEBUG(0,("linux_oplock_signal_handler: failed to find fsp for file fd=%d (file was closed ?)\n", fd ));
return;
}
- break_kernel_oplock(fsp->conn->sconn->msg_ctx, fsp);
+ break_kernel_oplock(sconn->msg_ctx, fsp);
}
/****************************************************************************
static bool linux_set_kernel_oplock(struct kernel_oplocks *ctx,
files_struct *fsp, int oplock_type)
{
+ struct file_id_buf idbuf;
+
if ( SMB_VFS_LINUX_SETLEASE(fsp, F_WRLCK) == -1) {
- DEBUG(3,("linux_set_kernel_oplock: Refused oplock on file %s, "
- "fd = %d, file_id = %s. (%s)\n",
- fsp_str_dbg(fsp), fsp->fh->fd,
- file_id_string_tos(&fsp->file_id),
- strerror(errno)));
+ DBG_NOTICE("Refused oplock on file %s, "
+ "fd = %d, file_id = %s. (%s)\n",
+ fsp_str_dbg(fsp),
+ fsp->fh->fd,
+ file_id_str_buf(fsp->file_id, &idbuf),
+ strerror(errno));
return False;
}
- DEBUG(3,("linux_set_kernel_oplock: got kernel oplock on file %s, "
- "file_id = %s gen_id = %lu\n",
- fsp_str_dbg(fsp), file_id_string_tos(&fsp->file_id),
- fsp->fh->gen_id));
+ DBG_NOTICE("got kernel oplock on file %s, "
+ "file_id = %s gen_id = %"PRIu64"\n",
+ fsp_str_dbg(fsp),
+ file_id_str_buf(fsp->file_id, &idbuf),
+ fsp->fh->gen_id);
return True;
}
static void linux_release_kernel_oplock(struct kernel_oplocks *ctx,
files_struct *fsp, int oplock_type)
{
+ struct file_id_buf idbuf;
+
if (DEBUGLVL(10)) {
/*
* Check and print out the current kernel
*/
int state = fcntl(fsp->fh->fd, F_GETLEASE, 0);
dbgtext("linux_release_kernel_oplock: file %s, file_id = %s "
- "gen_id = %lu has kernel oplock state "
- "of %x.\n", fsp_str_dbg(fsp),
- file_id_string_tos(&fsp->file_id),
- fsp->fh->gen_id, state );
+ "gen_id = %"PRIu64" has kernel oplock state "
+ "of %x.\n",
+ fsp_str_dbg(fsp),
+ file_id_str_buf(fsp->file_id, &idbuf),
+ fsp->fh->gen_id,
+ state);
}
/*
if (DEBUGLVL(0)) {
dbgtext("linux_release_kernel_oplock: Error when "
"removing kernel oplock on file " );
- dbgtext("%s, file_id = %s, gen_id = %lu. "
- "Error was %s\n", fsp_str_dbg(fsp),
- file_id_string_tos(&fsp->file_id),
- fsp->fh->gen_id, strerror(errno) );
+ dbgtext("%s, file_id = %s, gen_id = %"PRIu64". "
+ "Error was %s\n",
+ fsp_str_dbg(fsp),
+ file_id_str_buf(fsp->file_id, &idbuf),
+ fsp->fh->gen_id,
+ strerror(errno));
}
}
}
static const struct kernel_oplocks_ops linux_koplocks = {
.set_oplock = linux_set_kernel_oplock,
.release_oplock = linux_release_kernel_oplock,
- .contend_level2_oplocks_begin = NULL,
- .contend_level2_oplocks_end = NULL,
};
-struct kernel_oplocks *linux_init_kernel_oplocks(TALLOC_CTX *mem_ctx)
+struct kernel_oplocks *linux_init_kernel_oplocks(struct smbd_server_connection *sconn)
{
struct kernel_oplocks *ctx;
struct tevent_signal *se;
return NULL;
}
- ctx = talloc_zero(mem_ctx, struct kernel_oplocks);
+ ctx = talloc_zero(sconn, struct kernel_oplocks);
if (!ctx) {
DEBUG(0,("Linux Kernel oplocks talloc_Zero failed\n"));
return NULL;
}
ctx->ops = &linux_koplocks;
+ ctx->private_data = sconn;
- se = tevent_add_signal(server_event_context(),
+ se = tevent_add_signal(sconn->ev_ctx,
ctx,
RT_SIGNAL_LEASE, SA_SIGINFO,
linux_oplock_signal_handler,
return NULL;
}
- ctx->private_data = se;
-
DEBUG(3,("Linux kernel oplocks enabled\n"));
return ctx;
git.samba.org / samba.git / blobdiff