int DCOPY_open_file(const char* file, int read_flag, DCOPY_file_cache_t* cache)
{
int newfd = -1;
/* see if we have a cached file descriptor */
char* name = cache->name;
if (name != NULL) {
/* we have a cached file descriptor */
int fd = cache->fd;
if (strcmp(name, file) == 0 && cache->read == read_flag) {
/* the file we're trying to open matches name and read/write mode,
* so just return the cached descriptor */
return fd;
} else {
/* the file we're trying to open is different,
* close the old file and delete the name */
mfu_close(name, fd);
mfu_free(&cache->name);
}
}
/* open the new file */
if (read_flag) {
int flags = O_RDONLY;
if (DCOPY_user_opts.synchronous) {
flags |= O_DIRECT;
}
newfd = mfu_open(file, flags);
} else {
int flags = O_WRONLY | O_CREAT;
if (DCOPY_user_opts.synchronous) {
flags |= O_DIRECT;
}
newfd = mfu_open(file, flags, DCOPY_DEF_PERMS_FILE);
}
/* cache the file descriptor */
if (newfd != -1) {
cache->name = MFU_STRDUP(file);
cache->fd = newfd;
cache->read = read_flag;
}
return newfd;
}
static void walk_getdents_process_dir(const char* dir, CIRCLE_handle* handle)
{
char buf[BUF_SIZE];
/* TODO: may need to try these functions multiple times */
int fd = mfu_open(dir, O_RDONLY | O_DIRECTORY);
if (fd == -1) {
/* print error */
MFU_LOG(MFU_LOG_ERR, "Failed to open directory for reading: `%s' (errno=%d %s)", dir, errno, strerror(errno));
return;
}
/* Read all directory entries */
while (1) {
/* execute system call to get block of directory entries */
int nread = syscall(SYS_getdents, fd, buf, (int) BUF_SIZE);
if (nread == -1) {
MFU_LOG(MFU_LOG_ERR, "syscall to getdents failed when reading `%s' (errno=%d %s)", dir, errno, strerror(errno));
break;
}
/* bail out if we're done */
if (nread == 0) {
break;
}
/* otherwise, we read some bytes, so process each record */
int bpos = 0;
while (bpos < nread) {
/* get pointer to current record */
struct linux_dirent* d = (struct linux_dirent*)(buf + bpos);
/* get name of directory item, skip d_ino== 0, ".", and ".." entries */
char* name = d->d_name;
if (d->d_ino != 0 && (strncmp(name, ".", 2)) && (strncmp(name, "..", 3))) {
/* check whether we can define path to item:
* <dir> + '/' + <name> + '/0' */
char newpath[CIRCLE_MAX_STRING_LEN];
size_t len = strlen(dir) + 1 + strlen(name) + 1;
if (len < sizeof(newpath)) {
/* build full path to item */
strcpy(newpath, dir);
strcat(newpath, "/");
strcat(newpath, name);
/* get type of item */
char d_type = *(buf + bpos + d->d_reclen - 1);
#if 0
printf("%-10s ", (d_type == DT_REG) ? "regular" :
(d_type == DT_DIR) ? "directory" :
(d_type == DT_FIFO) ? "FIFO" :
(d_type == DT_SOCK) ? "socket" :
(d_type == DT_LNK) ? "symlink" :
(d_type == DT_BLK) ? "block dev" :
(d_type == DT_CHR) ? "char dev" : "???");
printf("%4d %10lld %s\n", d->d_reclen,
(long long) d->d_off, (char*) d->d_name);
#endif
/* TODO: this is hacky, would be better to create list elem directly */
/* determine type of item (just need to set bits in mode
* that get_mfu_filetype checks for) */
mode_t mode = 0;
if (d_type == DT_REG) {
mode |= S_IFREG;
}
else if (d_type == DT_DIR) {
mode |= S_IFDIR;
}
else if (d_type == DT_LNK) {
mode |= S_IFLNK;
}
/* insert a record for this item into our list */
mfu_flist_insert_stat(CURRENT_LIST, newpath, mode, NULL);
/* increment our item count */
reduce_items++;
/* recurse on directory if we have one */
if (d_type == DT_DIR) {
handle->enqueue(newpath);
}
}
else {
MFU_LOG(MFU_LOG_ERR, "Path name is too long: %lu chars exceeds limit %lu", len, sizeof(newpath));
}
}
/* advance to next record */
bpos += d->d_reclen;
}
}
mfu_close(dir, fd);
return;
}
/* write a chunk of the file */
static void write_file_chunk(mfu_file_chunk* p, const char* out_path)
{
size_t chunk_size = 1024*1024;
uint64_t base = (off_t)p->offset;
uint64_t file_size = (off_t)p->file_size;
const char *in_path = p->name;
uint64_t stripe_size = (off_t)p->length;
/* if the file size is 0, there's no data to restripe */
/* if the stripe size is 0, then there's no work to be done */
if (file_size == 0 || stripe_size == 0) {
return;
}
/* allocate buffer */
void* buf = MFU_MALLOC(chunk_size);
/* open input file for reading */
int in_fd = mfu_open(in_path, O_RDONLY);
if (in_fd < 0) {
MFU_LOG(MFU_LOG_ERR, "Failed to open input file %s (%s)", in_path, strerror(errno));
MPI_Abort(MPI_COMM_WORLD, 1);
}
/* open output file for writing */
int out_fd = mfu_open(out_path, O_WRONLY);
if (out_fd < 0) {
MFU_LOG(MFU_LOG_ERR, "Failed to open output file %s (%s)", out_path, strerror(errno));
MPI_Abort(MPI_COMM_WORLD, 1);
}
/* write data */
uint64_t chunk_id = 0;
uint64_t stripe_read = 0;
while (stripe_read < stripe_size) {
/* determine number of bytes to read */
/* try to read a full chunk's worth of bytes */
size_t read_size = chunk_size;
/* if the stripe doesn't have that much left */
uint64_t remainder = stripe_size - stripe_read;
if (remainder < (uint64_t) read_size) {
read_size = (size_t) remainder;
}
/* get byte offset to read from */
uint64_t offset = base + (chunk_id * chunk_size);
if (offset < file_size) {
/* the first byte falls within the file size,
* now check the last byte */
uint64_t last = offset + (uint64_t) read_size;
if (last > file_size) {
/* the last byte is beyond the end, set read size
* to the most we can read */
read_size = (size_t) (file_size - offset);
}
} else {
/* the first byte we need to read is past the end of
* the file, so don't read anything */
read_size = 0;
}
/* bail if we don't have anything to read */
if (read_size == 0) {
break;
}
/* seek to correct spot in input file */
off_t pos = (off_t) offset;
off_t seek_rc = mfu_lseek(in_path, in_fd, pos, SEEK_SET);
if (seek_rc == (off_t)-1) {
MFU_LOG(MFU_LOG_ERR, "Failed to seek in input file %s (%s)", in_path, strerror(errno));
MPI_Abort(MPI_COMM_WORLD, 1);
}
/* read chunk from input */
ssize_t nread = mfu_read(in_path, in_fd, buf, read_size);
/* check for errors */
if (nread < 0) {
MFU_LOG(MFU_LOG_ERR, "Failed to read data from input file %s (%s)", in_path, strerror(errno));
MPI_Abort(MPI_COMM_WORLD, 1);
}
/* check for short reads */
if (nread != read_size) {
MFU_LOG(MFU_LOG_ERR, "Got a short read from input file %s", in_path);
MPI_Abort(MPI_COMM_WORLD, 1);
}
/* seek to correct spot in output file */
seek_rc = mfu_lseek(out_path, out_fd, pos, SEEK_SET);
if (seek_rc == (off_t)-1) {
MFU_LOG(MFU_LOG_ERR, "Failed to seek in output file %s (%s)", out_path, strerror(errno));
MPI_Abort(MPI_COMM_WORLD, 1);
}
/* write chunk to output */
ssize_t nwrite = mfu_write(out_path, out_fd, buf, read_size);
/* check for errors */
if (nwrite < 0) {
MFU_LOG(MFU_LOG_ERR, "Failed to write data to output file %s (%s)", out_path, strerror(errno));
MPI_Abort(MPI_COMM_WORLD, 1);
}
/* check for short reads */
if (nwrite != read_size) {
MFU_LOG(MFU_LOG_ERR, "Got a short write to output file %s", out_path);
MPI_Abort(MPI_COMM_WORLD, 1);
}
/* update our byte count for progress messages */
stripe_prog_bytes += read_size;
mfu_progress_update(&stripe_prog_bytes, stripe_prog);
/* go on to the next chunk in this stripe, we assume we
* read the whole chunk size, if we didn't it's because
* the stripe is smaller or we're at the end of the file,
* but in either case we're done so it doesn't hurt to
* over estimate in this calculation */
stripe_read += (uint64_t) chunk_size;
chunk_id++;
}
/* close files */
mfu_fsync(out_path, out_fd);
mfu_close(out_path, out_fd);
mfu_close(in_path, in_fd);
/* free buffer */
mfu_free(&buf);
}
/* open the specified file, read specified chunk, and close file,
* returns -1 on any read error */
static int read_data(const char* fname, char* chunk_buf, uint64_t chunk_id,
uint64_t chunk_size, uint64_t file_size,
uint64_t* data_size)
{
int status = 0;
assert(chunk_id > 0);
/* compute byte offset to read from in file */
uint64_t offset = (chunk_id - 1) * chunk_size;
/* zero out our buffer */
memset(chunk_buf, 0, chunk_size);
/* open the file */
int fd = mfu_open(fname, O_RDONLY);
if (fd < 0) {
return -1;
}
/* seek to the correct offset */
if (mfu_lseek(fname, fd, (off_t)offset, SEEK_SET) == (off_t) - 1) {
status = -1;
goto out;
}
/* read data from file */
ssize_t read_size = mfu_read(fname, fd, chunk_buf, chunk_size);
if (read_size < 0) {
/* read failed */
status = -1;
goto out;
}
/* compute number of bytes we expect to read */
ssize_t expect_size = (ssize_t) chunk_size;
if (chunk_id * chunk_size > file_size) {
if (offset >= file_size) {
/* have gone past the end of the file, expect to read 0 */
expect_size = 0;
} else {
/* read partial chunk */
expect_size = (ssize_t) (file_size - offset);
}
}
/* check that we read all bytes we expected */
if (read_size != expect_size) {
/* File size has been changed */
status = -1;
goto out;
}
/* return number of bytes read */
*data_size = (uint64_t)read_size;
out:
/* close our file and return */
mfu_close(fname, fd);
return status;
}
int DCOPY_open_file(const char* file, int read_flag, DCOPY_file_cache_t* cache)
{
int newfd = -1;
/* see if we have a cached file descriptor */
char* name = cache->name;
if (name != NULL) {
/* we have a cached file descriptor */
int fd = cache->fd;
if (strcmp(name, file) == 0 && cache->read == read_flag) {
/* the file we're trying to open matches name and read/write mode,
* so just return the cached descriptor */
return fd;
} else {
/* the file we're trying to open is different,
* close the old file and delete the name */
mfu_close(name, fd);
mfu_free(&cache->name);
}
}
/* open the new file */
if (read_flag) {
int flags = O_RDONLY;
if (DCOPY_user_opts.synchronous) {
flags |= O_DIRECT;
}
newfd = mfu_open(file, flags);
} else {
int flags = O_WRONLY | O_CREAT;
if (DCOPY_user_opts.synchronous) {
flags |= O_DIRECT;
}
newfd = mfu_open(file, flags, DCOPY_DEF_PERMS_FILE);
}
/* cache the file descriptor */
if (newfd != -1) {
cache->name = MFU_STRDUP(file);
cache->fd = newfd;
cache->read = read_flag;
#ifdef LUSTRE_SUPPORT
/* Zero is an invalid ID for grouplock. */
if (DCOPY_user_opts.grouplock_id != 0) {
int rc;
rc = ioctl(newfd, LL_IOC_GROUP_LOCK, DCOPY_user_opts.grouplock_id);
if (rc) {
MFU_LOG(MFU_LOG_ERR, "Failed to obtain grouplock with ID %d "
"on file `%s', ignoring this error: %s",
DCOPY_user_opts.grouplock_id,
file, strerror(errno));
} else {
MFU_LOG(MFU_LOG_INFO, "Obtained grouplock with ID %d "
"on file `%s', fd %d", DCOPY_user_opts.grouplock_id,
file, newfd);
}
}
#endif
}
return newfd;
}
