#include "index.h"
-/*
- * Create the index file associated with a trace file.
- *
- * Return allocated struct lttng_index_file, NULL on error.
- */
-struct lttng_index_file *lttng_index_file_create(const 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);
- if (ret < 0) {
- PERROR("snprintf index path");
- goto error;
- }
-
- /* Create index directory if necessary. */
- ret = utils_mkdir(fullpath, S_IRWXU | S_IRWXG, uid, gid);
- if (ret < 0) {
- 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) {
- goto error;
- }
- fd = ret;
-
- ctf_packet_index_file_hdr_init(&hdr, major, minor);
- size_ret = lttng_write(fd, &hdr, sizeof(hdr));
- if (size_ret < sizeof(hdr)) {
- PERROR("write index header");
- 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 index_file;
-
-error:
- if (fd >= 0) {
- int close_ret;
-
- close_ret = close(fd);
- if (close_ret < 0) {
- PERROR("close index fd");
- }
- }
- free(index_file);
- return NULL;
-}
+#define WRITE_FILE_FLAGS (O_WRONLY | O_CREAT | O_TRUNC)
+#define READ_ONLY_FILE_FLAGS O_RDONLY
-struct lttng_index_file *lttng_index_file_create_from_trace_chunk(
+static struct lttng_index_file *_lttng_index_file_create_from_trace_chunk(
struct lttng_trace_chunk *chunk,
- const char *channel_path, char *stream_name,
- uint64_t stream_file_size, uint64_t stream_count,
+ const char *channel_path, const char *stream_name,
+ uint64_t stream_file_size, uint64_t stream_file_index,
uint32_t index_major, uint32_t index_minor,
- bool unlink_existing_file)
+ bool unlink_existing_file,
+ int flags)
{
struct lttng_index_file *index_file;
enum lttng_trace_chunk_status chunk_status;
struct ctf_packet_index_file_hdr hdr;
char index_directory_path[LTTNG_PATH_MAX];
char index_file_path[LTTNG_PATH_MAX];
- const uint32_t element_len = ctf_packet_index_len(index_major,
- index_minor);
- const int flags = O_WRONLY | O_CREAT | O_TRUNC;
const mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP;
+ const bool acquired_reference = lttng_trace_chunk_get(chunk);
+
+ assert(acquired_reference);
index_file = zmalloc(sizeof(*index_file));
if (!index_file) {
goto error;
}
+ index_file->trace_chunk = chunk;
ret = snprintf(index_directory_path, sizeof(index_directory_path),
"%s/" DEFAULT_INDEX_DIR, channel_path);
if (ret < 0 || ret >= sizeof(index_directory_path)) {
}
ret = utils_stream_file_path(index_directory_path, stream_name,
- stream_file_size, stream_count,
+ stream_file_size, stream_file_index,
DEFAULT_INDEX_FILE_SUFFIX,
index_file_path, sizeof(index_file_path));
if (ret) {
* stays valid even if we re-create a new file with the
* same name afterwards.
*/
- chunk_status = lttng_trace_chunk_unlink_file(chunk,
- index_file_path);
- if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
+ chunk_status = lttng_trace_chunk_unlink_file(
+ chunk, index_file_path);
+ if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK &&
+ !(chunk_status == LTTNG_TRACE_CHUNK_STATUS_ERROR &&
+ errno == ENOENT)) {
goto error;
}
- }
+ }
chunk_status = lttng_trace_chunk_open_file(chunk, index_file_path,
flags, mode, &fd);
goto error;
}
- ctf_packet_index_file_hdr_init(&hdr, index_major, index_minor);
- size_ret = lttng_write(fd, &hdr, sizeof(hdr));
- if (size_ret < sizeof(hdr)) {
- PERROR("Failed to write index header");
- goto error;
+ if (flags == WRITE_FILE_FLAGS) {
+ ctf_packet_index_file_hdr_init(&hdr, index_major, index_minor);
+ size_ret = lttng_write(fd, &hdr, sizeof(hdr));
+ if (size_ret < sizeof(hdr)) {
+ PERROR("Failed to write index header");
+ goto error;
+ }
+ index_file->element_len = ctf_packet_index_len(index_major, index_minor);
+ } else {
+ uint32_t element_len;
+
+ size_ret = lttng_read(fd, &hdr, sizeof(hdr));
+ if (size_ret < 0) {
+ PERROR("Failed to read index header");
+ goto error;
+ }
+ if (be32toh(hdr.magic) != CTF_INDEX_MAGIC) {
+ ERR("Invalid header magic");
+ goto error;
+ }
+ if (index_major != be32toh(hdr.index_major)) {
+ ERR("Index major number mismatch: %u, expect %u",
+ be32toh(hdr.index_major), index_major);
+ goto error;
+ }
+ if (index_minor != be32toh(hdr.index_minor)) {
+ ERR("Index minor number mismatch: %u, expect %u",
+ be32toh(hdr.index_minor), index_minor);
+ goto error;
+ }
+ element_len = be32toh(hdr.packet_index_len);
+ if (element_len > sizeof(struct ctf_packet_index)) {
+ ERR("Index element length too long");
+ goto error;
+ }
+ index_file->element_len = element_len;
}
index_file->fd = fd;
index_file->major = index_major;
index_file->minor = index_minor;
- index_file->element_len = element_len;
urcu_ref_init(&index_file->ref);
return index_file;
return NULL;
}
+struct lttng_index_file *lttng_index_file_create_from_trace_chunk(
+ struct lttng_trace_chunk *chunk,
+ const char *channel_path, const char *stream_name,
+ uint64_t stream_file_size, uint64_t stream_file_index,
+ uint32_t index_major, uint32_t index_minor,
+ bool unlink_existing_file)
+{
+ return _lttng_index_file_create_from_trace_chunk(chunk, channel_path,
+ stream_name, stream_file_size, stream_file_index,
+ index_major, index_minor, unlink_existing_file,
+ WRITE_FILE_FLAGS);
+}
+
+struct lttng_index_file *lttng_index_file_create_from_trace_chunk_read_only(
+ struct lttng_trace_chunk *chunk,
+ const char *channel_path, const char *stream_name,
+ uint64_t stream_file_size, uint64_t stream_file_index,
+ uint32_t index_major, uint32_t index_minor)
+{
+ return _lttng_index_file_create_from_trace_chunk(chunk, channel_path,
+ stream_name, stream_file_size, stream_file_index,
+ index_major, index_minor, false,
+ READ_ONLY_FILE_FLAGS);
+}
+
/*
* Write index values to the given index file.
*
return -1;
}
-/*
- * Open index file using a given path, channel name and tracefile count.
- *
- * Return allocated struct lttng_index_file, NULL on error.
- */
-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,
- channel_name, tracefile_count_current);
- } else {
- ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR "/%s"
- DEFAULT_INDEX_FILE_SUFFIX, path_name, channel_name);
- }
- if (ret < 0) {
- PERROR("snprintf index path");
- goto error;
- }
-
- DBG("Index opening file %s in read only", fullpath);
- read_fd = open(fullpath, O_RDONLY);
- if (read_fd < 0) {
- PERROR("opening index in read-only");
- goto error;
- }
-
- read_len = lttng_read(read_fd, &hdr, sizeof(hdr));
- if (read_len < 0) {
- PERROR("Reading index header");
- goto error_close;
- }
-
- if (be32toh(hdr.magic) != CTF_INDEX_MAGIC) {
- ERR("Invalid header magic");
- goto error_close;
- }
- 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 index_file;
-
-error_close:
- if (read_fd >= 0) {
- int close_ret;
-
- close_ret = close(read_fd);
- if (close_ret < 0) {
- PERROR("close read fd %d", read_fd);
- }
- }
-
-error:
- free(index_file);
- return NULL;
-}
-
void lttng_index_file_get(struct lttng_index_file *index_file)
{
urcu_ref_get(&index_file->ref);
if (close(index_file->fd)) {
PERROR("close index fd");
}
+ lttng_trace_chunk_put(index_file->trace_chunk);
free(index_file);
}