* Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
* Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
- * 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; only version 2
- * of the License.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2 only,
+ * as published by the Free Software Foundation.
*
* 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, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define _GNU_SOURCE
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/types.h>
+#include <inttypes.h>
#include <unistd.h>
#include <sys/stat.h>
#include <common/common.h>
#include <common/kernel-ctl/kernel-ctl.h>
#include <common/sessiond-comm/sessiond-comm.h>
+#include <common/sessiond-comm/relayd.h>
#include <common/compat/fcntl.h>
+#include <common/relayd/relayd.h>
#include "kernel-consumer.h"
extern int consumer_poll_timeout;
extern volatile int consumer_quit;
-/*
- * Mmap the ring buffer, read it and write the data to the tracefile.
- *
- * Returns the number of bytes written
- */
-ssize_t lttng_kconsumer_on_read_subbuffer_mmap(
- struct lttng_consumer_local_data *ctx,
- struct lttng_consumer_stream *stream, unsigned long len)
-{
- unsigned long mmap_offset;
- ssize_t ret = 0;
- off_t orig_offset = stream->out_fd_offset;
- int fd = stream->wait_fd;
- int outfd = stream->out_fd;
-
- /* get the offset inside the fd to mmap */
- ret = kernctl_get_mmap_read_offset(fd, &mmap_offset);
- if (ret != 0) {
- errno = -ret;
- perror("kernctl_get_mmap_read_offset");
- goto end;
- }
-
- while (len > 0) {
- ret = write(outfd, stream->mmap_base + mmap_offset, len);
- if (ret >= len) {
- len = 0;
- } else if (ret < 0) {
- errno = -ret;
- perror("Error in file write");
- goto end;
- }
- /* This won't block, but will start writeout asynchronously */
- lttng_sync_file_range(outfd, stream->out_fd_offset, ret,
- SYNC_FILE_RANGE_WRITE);
- stream->out_fd_offset += ret;
- }
-
- lttng_consumer_sync_trace_file(stream, orig_offset);
-
- goto end;
-
-end:
- return ret;
-}
-
-/*
- * Splice the data from the ring buffer to the tracefile.
- *
- * Returns the number of bytes spliced.
- */
-ssize_t lttng_kconsumer_on_read_subbuffer_splice(
- struct lttng_consumer_local_data *ctx,
- struct lttng_consumer_stream *stream, unsigned long len)
-{
- ssize_t ret = 0;
- loff_t offset = 0;
- off_t orig_offset = stream->out_fd_offset;
- int fd = stream->wait_fd;
- int outfd = stream->out_fd;
-
- while (len > 0) {
- DBG("splice chan to pipe offset %lu (fd : %d)",
- (unsigned long)offset, fd);
- ret = splice(fd, &offset, ctx->consumer_thread_pipe[1], NULL, len,
- SPLICE_F_MOVE | SPLICE_F_MORE);
- DBG("splice chan to pipe ret %zd", ret);
- if (ret < 0) {
- errno = -ret;
- perror("Error in relay splice");
- goto splice_error;
- }
-
- ret = splice(ctx->consumer_thread_pipe[0], NULL, outfd, NULL, ret,
- SPLICE_F_MOVE | SPLICE_F_MORE);
- DBG("splice pipe to file %zd", ret);
- if (ret < 0) {
- errno = -ret;
- perror("Error in file splice");
- goto splice_error;
- }
- len -= ret;
- /* This won't block, but will start writeout asynchronously */
- lttng_sync_file_range(outfd, stream->out_fd_offset, ret,
- SYNC_FILE_RANGE_WRITE);
- stream->out_fd_offset += ret;
- }
- lttng_consumer_sync_trace_file(stream, orig_offset);
-
- goto end;
-
-splice_error:
- /* send the appropriate error description to sessiond */
- switch(ret) {
- case EBADF:
- lttng_consumer_send_error(ctx, CONSUMERD_SPLICE_EBADF);
- break;
- case EINVAL:
- lttng_consumer_send_error(ctx, CONSUMERD_SPLICE_EINVAL);
- break;
- case ENOMEM:
- lttng_consumer_send_error(ctx, CONSUMERD_SPLICE_ENOMEM);
- break;
- case ESPIPE:
- lttng_consumer_send_error(ctx, CONSUMERD_SPLICE_ESPIPE);
- break;
- }
-
-end:
- return ret;
-}
-
/*
* Take a snapshot for a specific fd
*
ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg));
if (ret != sizeof(msg)) {
- lttng_consumer_send_error(ctx, CONSUMERD_ERROR_RECV_CMD);
+ lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD);
return ret;
}
if (msg.cmd_type == LTTNG_CONSUMER_STOP) {
return -ENOENT;
}
+ /* relayd needs RCU read-side protection */
+ rcu_read_lock();
+
switch (msg.cmd_type) {
+ case LTTNG_CONSUMER_ADD_RELAYD_SOCKET:
+ {
+ ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index,
+ msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll,
+ &msg.u.relayd_sock.sock);
+ goto end_nosignal;
+ }
case LTTNG_CONSUMER_ADD_CHANNEL:
{
struct lttng_consumer_channel *new_channel;
msg.u.channel.mmap_len,
msg.u.channel.max_sb_size);
if (new_channel == NULL) {
- lttng_consumer_send_error(ctx, CONSUMERD_OUTFD_ERROR);
+ lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR);
goto end_nosignal;
}
if (ctx->on_recv_channel != NULL) {
}
case LTTNG_CONSUMER_ADD_STREAM:
{
- struct lttng_consumer_stream *new_stream;
int fd;
+ struct consumer_relayd_sock_pair *relayd = NULL;
+ struct lttng_consumer_stream *new_stream;
/* block */
if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
+ rcu_read_unlock();
return -EINTR;
}
+
+ /* Get stream file descriptor from socket */
ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1);
if (ret != sizeof(fd)) {
- lttng_consumer_send_error(ctx, CONSUMERD_ERROR_RECV_FD);
+ lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD);
+ rcu_read_unlock();
return ret;
}
- DBG("consumer_add_stream %s (%d)", msg.u.stream.path_name,
- fd);
new_stream = consumer_allocate_stream(msg.u.stream.channel_key,
msg.u.stream.stream_key,
fd, fd,
msg.u.stream.output,
msg.u.stream.path_name,
msg.u.stream.uid,
- msg.u.stream.gid);
+ msg.u.stream.gid,
+ msg.u.stream.net_index,
+ msg.u.stream.metadata_flag);
if (new_stream == NULL) {
- lttng_consumer_send_error(ctx, CONSUMERD_OUTFD_ERROR);
- goto end;
+ lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR);
+ goto end_nosignal;
}
- if (ctx->on_recv_stream != NULL) {
- ret = ctx->on_recv_stream(new_stream);
- if (ret == 0) {
- consumer_add_stream(new_stream);
- } else if (ret < 0) {
- goto end;
+
+ /*
+ * The buffer flush is done on the session daemon side for the kernel
+ * so no need for the stream "hangup_flush_done" variable to be
+ * tracked. This is important for a kernel stream since we don't rely
+ * on the flush state of the stream to read data. It's not the case for
+ * user space tracing.
+ */
+ new_stream->hangup_flush_done = 0;
+
+ /* The stream is not metadata. Get relayd reference if exists. */
+ relayd = consumer_find_relayd(msg.u.stream.net_index);
+ if (relayd != NULL) {
+ /* Add stream on the relayd */
+ pthread_mutex_lock(&relayd->ctrl_sock_mutex);
+ ret = relayd_add_stream(&relayd->control_sock,
+ msg.u.stream.name, msg.u.stream.path_name,
+ &new_stream->relayd_stream_id);
+ pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
+ if (ret < 0) {
+ goto end_nosignal;
+ }
+ } else if (msg.u.stream.net_index != -1) {
+ ERR("Network sequence index %d unknown. Not adding stream.",
+ msg.u.stream.net_index);
+ free(new_stream);
+ goto end_nosignal;
+ }
+
+ /* Send stream to the metadata thread */
+ if (new_stream->metadata_flag) {
+ if (ctx->on_recv_stream) {
+ ret = ctx->on_recv_stream(new_stream);
+ if (ret < 0) {
+ goto end_nosignal;
+ }
+ }
+
+ do {
+ ret = write(ctx->consumer_metadata_pipe[1], new_stream,
+ sizeof(struct lttng_consumer_stream));
+ } while (ret < 0 && errno == EINTR);
+ if (ret < 0) {
+ PERROR("write metadata pipe");
}
} else {
+ if (ctx->on_recv_stream) {
+ ret = ctx->on_recv_stream(new_stream);
+ if (ret < 0) {
+ goto end_nosignal;
+ }
+ }
consumer_add_stream(new_stream);
}
+
+ DBG("Kernel consumer_add_stream (%d)", fd);
break;
}
case LTTNG_CONSUMER_UPDATE_STREAM:
{
- if (ctx->on_update_stream != NULL) {
- ret = ctx->on_update_stream(msg.u.stream.stream_key, msg.u.stream.state);
- if (ret == 0) {
- consumer_change_stream_state(msg.u.stream.stream_key, msg.u.stream.state);
- } else if (ret < 0) {
- goto end;
- }
- } else {
- consumer_change_stream_state(msg.u.stream.stream_key,
- msg.u.stream.state);
+ rcu_read_unlock();
+ return -ENOSYS;
+ }
+ case LTTNG_CONSUMER_DESTROY_RELAYD:
+ {
+ uint64_t index = msg.u.destroy_relayd.net_seq_idx;
+ struct consumer_relayd_sock_pair *relayd;
+
+ DBG("Kernel consumer destroying relayd %" PRIu64, index);
+
+ /* Get relayd reference if exists. */
+ relayd = consumer_find_relayd(index);
+ if (relayd == NULL) {
+ ERR("Unable to find relayd %" PRIu64, index);
+ goto end_nosignal;
}
- break;
+
+ /*
+ * Each relayd socket pair has a refcount of stream attached to it
+ * which tells if the relayd is still active or not depending on the
+ * refcount value.
+ *
+ * This will set the destroy flag of the relayd object and destroy it
+ * if the refcount reaches zero when called.
+ *
+ * The destroy can happen either here or when a stream fd hangs up.
+ */
+ consumer_flag_relayd_for_destroy(relayd);
+
+ goto end_nosignal;
}
default:
- break;
- }
-end:
- /* signal the poll thread */
- ret = write(ctx->consumer_poll_pipe[1], "4", 1);
- if (ret < 0) {
- perror("write consumer poll");
+ goto end_nosignal;
}
+
+ /*
+ * Wake-up the other end by writing a null byte in the pipe (non-blocking).
+ * Important note: Because writing into the pipe is non-blocking (and
+ * therefore we allow dropping wakeup data, as long as there is wakeup data
+ * present in the pipe buffer to wake up the other end), the other end
+ * should perform the following sequence for waiting:
+ *
+ * 1) empty the pipe (reads).
+ * 2) perform update operation.
+ * 3) wait on the pipe (poll).
+ */
+ do {
+ ret = write(ctx->consumer_poll_pipe[1], "", 1);
+ } while (ret < 0 && errno == EINTR);
end_nosignal:
- return 0;
+ rcu_read_unlock();
+
+ /*
+ * Return 1 to indicate success since the 0 value can be a socket
+ * shutdown during the recv() or send() call.
+ */
+ return 1;
}
/*
ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
struct lttng_consumer_local_data *ctx)
{
- unsigned long len;
+ unsigned long len, subbuf_size, padding;
int err;
ssize_t ret = 0;
int infd = stream->wait_fd;
/* Get the next subbuffer */
err = kernctl_get_next_subbuf(infd);
if (err != 0) {
+ ret = err;
/*
* This is a debug message even for single-threaded consumer,
* because poll() have more relaxed criterions than get subbuf,
goto end;
}
+ /* Get the full subbuffer size including padding */
+ err = kernctl_get_padded_subbuf_size(infd, &len);
+ if (err != 0) {
+ errno = -err;
+ perror("Getting sub-buffer len failed.");
+ ret = err;
+ goto end;
+ }
+
switch (stream->output) {
- case LTTNG_EVENT_SPLICE:
- /* read the whole subbuffer */
- err = kernctl_get_padded_subbuf_size(infd, &len);
- if (err != 0) {
- errno = -ret;
- perror("Getting sub-buffer len failed.");
- goto end;
- }
+ case LTTNG_EVENT_SPLICE:
- /* splice the subbuffer to the tracefile */
- ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, len);
- if (ret < 0) {
- /*
- * display the error but continue processing to try
- * to release the subbuffer
- */
- ERR("Error splicing to tracefile");
- }
- break;
- case LTTNG_EVENT_MMAP:
- /* read the used subbuffer size */
- err = kernctl_get_padded_subbuf_size(infd, &len);
- if (err != 0) {
- errno = -ret;
- perror("Getting sub-buffer len failed.");
- goto end;
- }
- /* write the subbuffer to the tracefile */
- ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len);
- if (ret < 0) {
- /*
- * display the error but continue processing to try
- * to release the subbuffer
- */
- ERR("Error writing to tracefile");
- }
- break;
- default:
- ERR("Unknown output method");
- ret = -1;
+ /*
+ * XXX: The lttng-modules splice "actor" does not handle copying
+ * partial pages hence only using the subbuffer size without the
+ * padding makes the splice fail.
+ */
+ subbuf_size = len;
+ padding = 0;
+
+ /* splice the subbuffer to the tracefile */
+ ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size,
+ padding);
+ /*
+ * XXX: Splice does not support network streaming so the return value
+ * is simply checked against subbuf_size and not like the mmap() op.
+ */
+ if (ret != subbuf_size) {
+ /*
+ * display the error but continue processing to try
+ * to release the subbuffer
+ */
+ ERR("Error splicing to tracefile (ret: %zd != len: %lu)",
+ ret, subbuf_size);
+ }
+ break;
+ case LTTNG_EVENT_MMAP:
+ /* Get subbuffer size without padding */
+ err = kernctl_get_subbuf_size(infd, &subbuf_size);
+ if (err != 0) {
+ errno = -err;
+ perror("Getting sub-buffer len failed.");
+ ret = err;
+ goto end;
+ }
+
+ /* Make sure the tracer is not gone mad on us! */
+ assert(len >= subbuf_size);
+
+ padding = len - subbuf_size;
+
+ /* write the subbuffer to the tracefile */
+ ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size,
+ padding);
+ /*
+ * The mmap operation should write subbuf_size amount of data when
+ * network streaming or the full padding (len) size when we are _not_
+ * streaming.
+ */
+ if ((ret != subbuf_size && stream->net_seq_idx != -1) ||
+ (ret != len && stream->net_seq_idx == -1)) {
+ /*
+ * Display the error but continue processing to try to release the
+ * subbuffer
+ */
+ ERR("Error writing to tracefile "
+ "(ret: %zd != len: %lu != subbuf_size: %lu)",
+ ret, len, subbuf_size);
+ }
+ break;
+ default:
+ ERR("Unknown output method");
+ ret = -1;
}
err = kernctl_put_next_subbuf(infd);
if (err != 0) {
- errno = -ret;
+ errno = -err;
if (errno == EFAULT) {
perror("Error in unreserving sub buffer\n");
} else if (errno == EIO) {
/* Should never happen with newer LTTng versions */
perror("Reader has been pushed by the writer, last sub-buffer corrupted.");
}
+
+ ret = -err;
goto end;
}
int ret;
/* Opening the tracefile in write mode */
- if (stream->path_name != NULL) {
+ if (strlen(stream->path_name) > 0 && stream->net_seq_idx == -1) {
ret = run_as_open(stream->path_name,
O_WRONLY|O_CREAT|O_TRUNC,
S_IRWXU|S_IRWXG|S_IRWXO,
projects / lttng-tools.git / blobdiff