/*
* Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
* David Goulet <dgoulet@efficios.com>
+ * 2016 - 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, version 2 only, as
* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#define _GNU_SOURCE
+#define _LGPL_SOURCE
#include <assert.h>
#include <sys/stat.h>
#include <sys/types.h>
/*
* Create the index file associated with a trace file.
*
- * Return fd on success, a negative value on error.
+ * Return allocated struct lttng_index_file, NULL on error.
*/
-int index_create_file(char *path_name, char *stream_name, int uid, int gid,
- uint64_t size, uint64_t count)
+struct lttng_index_file *lttng_index_file_create(char *path_name,
+ char *stream_name, int uid, int gid,
+ uint64_t size, uint64_t count, uint32_t major, uint32_t minor)
{
+ struct lttng_index_file *index_file;
int ret, fd = -1;
ssize_t size_ret;
struct ctf_packet_index_file_hdr hdr;
char fullpath[PATH_MAX];
+ uint32_t element_len = ctf_packet_index_len(major, minor);
+
+ index_file = zmalloc(sizeof(*index_file));
+ if (!index_file) {
+ PERROR("allocating lttng_index_file");
+ goto error;
+ }
ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR,
path_name);
}
/* Create index directory if necessary. */
- ret = run_as_mkdir(fullpath, S_IRWXU | S_IRWXG, uid, gid);
+ ret = utils_mkdir(fullpath, S_IRWXU | S_IRWXG, uid, gid);
if (ret < 0) {
- if (ret != -EEXIST) {
+ if (errno != EEXIST) {
PERROR("Index trace directory creation error");
goto error;
}
}
+ /*
+ * For tracefile rotation. We need to unlink the old
+ * file if present to synchronize with the tail of the
+ * live viewer which could be working on this same file.
+ * By doing so, any reference to the old index file
+ * stays valid even if we re-create a new file with the
+ * same name afterwards.
+ */
+ ret = utils_unlink_stream_file(fullpath, stream_name, size, count, uid,
+ gid, DEFAULT_INDEX_FILE_SUFFIX);
+ if (ret < 0 && errno != ENOENT) {
+ goto error;
+ }
ret = utils_create_stream_file(fullpath, stream_name, size, count, uid,
gid, DEFAULT_INDEX_FILE_SUFFIX);
if (ret < 0) {
fd = ret;
hdr.magic = htobe32(CTF_INDEX_MAGIC);
- hdr.index_major = htobe32(CTF_INDEX_MAJOR);
- hdr.index_minor = htobe32(CTF_INDEX_MINOR);
- hdr.packet_index_len = htobe32(sizeof(struct ctf_packet_index));
+ hdr.index_major = htobe32(major);
+ hdr.index_minor = htobe32(minor);
+ hdr.packet_index_len = htobe32(element_len);
size_ret = lttng_write(fd, &hdr, sizeof(hdr));
if (size_ret < sizeof(hdr)) {
PERROR("write index header");
- ret = -1;
goto error;
}
+ index_file->fd = fd;
+ index_file->major = major;
+ index_file->minor = minor;
+ index_file->element_len = element_len;
+ urcu_ref_init(&index_file->ref);
- return fd;
+ return index_file;
error:
if (fd >= 0) {
PERROR("close index fd");
}
}
- return ret;
+ free(index_file);
+ return NULL;
}
/*
- * Write index values to the given fd of size len.
+ * Write index values to the given index file.
*
- * Return "len" on success or else < len on error. errno contains error
- * details.
+ * Return 0 on success, -1 on error.
*/
-ssize_t index_write(int fd, struct ctf_packet_index *index, size_t len)
+int lttng_index_file_write(const struct lttng_index_file *index_file,
+ const struct ctf_packet_index *element)
{
+ int fd;
+ size_t len;
ssize_t ret;
- assert(index);
+ assert(index_file);
+ assert(element);
+
+ fd = index_file->fd;
+ len = index_file->element_len;
if (fd < 0) {
- ret = -EINVAL;
goto error;
}
- ret = lttng_write(fd, index, len);
+ ret = lttng_write(fd, element, len);
if (ret < len) {
PERROR("writing index file");
+ goto error;
}
+ return 0;
error:
- return ret;
+ return -1;
+}
+
+/*
+ * Read index values from the given index file.
+ *
+ * Return 0 on success, -1 on error.
+ */
+int lttng_index_file_read(const struct lttng_index_file *index_file,
+ struct ctf_packet_index *element)
+{
+ ssize_t ret;
+ int fd = index_file->fd;
+ size_t len = index_file->element_len;
+
+ assert(element);
+
+ if (fd < 0) {
+ goto error;
+ }
+
+ ret = lttng_read(fd, element, len);
+ if (ret < len) {
+ PERROR("read index file");
+ goto error;
+ }
+ return 0;
+
+error:
+ return -1;
}
/*
* Open index file using a given path, channel name and tracefile count.
*
- * Return read only FD on success or else a negative value.
+ * Return allocated struct lttng_index_file, NULL on error.
*/
-int index_open(const char *path_name, const char *channel_name,
- uint64_t tracefile_count, uint64_t tracefile_count_current)
+struct lttng_index_file *lttng_index_file_open(const char *path_name,
+ const char *channel_name, uint64_t tracefile_count,
+ uint64_t tracefile_count_current)
{
+ struct lttng_index_file *index_file;
int ret, read_fd;
ssize_t read_len;
char fullpath[PATH_MAX];
struct ctf_packet_index_file_hdr hdr;
+ uint32_t major, minor, element_len;
assert(path_name);
assert(channel_name);
+ index_file = zmalloc(sizeof(*index_file));
+ if (!index_file) {
+ PERROR("allocating lttng_index_file");
+ goto error;
+ }
+
if (tracefile_count > 0) {
ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR "/%s_%"
PRIu64 DEFAULT_INDEX_FILE_SUFFIX, path_name,
DBG("Index opening file %s in read only", fullpath);
read_fd = open(fullpath, O_RDONLY);
if (read_fd < 0) {
- if (errno == ENOENT) {
- ret = -ENOENT;
- } else {
- PERROR("opening index in read-only");
- }
+ PERROR("opening index in read-only");
goto error;
}
ERR("Invalid header magic");
goto error_close;
}
- if (be32toh(hdr.index_major) != CTF_INDEX_MAJOR ||
- be32toh(hdr.index_minor) != CTF_INDEX_MINOR) {
+ major = be32toh(hdr.index_major);
+ minor = be32toh(hdr.index_minor);
+ element_len = be32toh(hdr.packet_index_len);
+
+ if (major != CTF_INDEX_MAJOR) {
ERR("Invalid header version");
goto error_close;
}
+ if (element_len > sizeof(struct ctf_packet_index)) {
+ ERR("Index element length too long");
+ goto error_close;
+ }
+
+ index_file->fd = read_fd;
+ index_file->major = major;
+ index_file->minor = minor;
+ index_file->element_len = element_len;
+ urcu_ref_init(&index_file->ref);
- return read_fd;
+ return index_file;
error_close:
if (read_fd >= 0) {
PERROR("close read fd %d", read_fd);
}
}
- ret = -1;
error:
- return ret;
+ free(index_file);
+ return NULL;
+}
+
+void lttng_index_file_get(struct lttng_index_file *index_file)
+{
+ urcu_ref_get(&index_file->ref);
+}
+
+static void lttng_index_file_release(struct urcu_ref *ref)
+{
+ struct lttng_index_file *index_file = caa_container_of(ref,
+ struct lttng_index_file, ref);
+
+ if (close(index_file->fd)) {
+ PERROR("close index fd");
+ }
+ free(index_file);
+}
+
+void lttng_index_file_put(struct lttng_index_file *index_file)
+{
+ urcu_ref_put(&index_file->ref, lttng_index_file_release);
}