[fio.git] / engines / pmemblk.c

/*
 * pmemblk: IO engine that uses NVML libpmemblk to read and write data
 *
 * Copyright (C) 2016 Hewlett Packard Enterprise Development LP
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License,
 * version 2 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
 */

/*
 * pmemblk engine
 *
 * IO engine that uses libpmemblk to read and write data
 *
 * To use:
 *   ioengine=pmemblk
 *
 * Other relevant settings:
 *   iodepth=1
 *   direct=1
 *   thread=1   REQUIRED
 *   unlink=1
 *   filename=/pmem0/fiotestfile,BSIZE,FSIZEMB
 *
 *   thread must be set to 1 for pmemblk as multiple processes cannot
 *     open the same block pool file.
 *
 *   iodepth should be set to 1 as pmemblk is always synchronous.
 *   Use numjobs to scale up.
 *
 *   direct=1 is implied as pmemblk is always direct.
 *
 *   Can set unlink to 1 to remove the block pool file after testing.
 *
 *   When specifying the filename, if the block pool file does not already
 *   exist, then the pmemblk engine can create the pool file if you specify
 *   the block and file sizes.  BSIZE is the block size in bytes.
 *   FSIZEMB is the pool file size in MB.
 *
 *   See examples/pmemblk.fio for more.
 *
 * libpmemblk.so
 *   By default, the pmemblk engine will let the system find the libpmemblk.so
 *   that it uses.  You can use an alternative libpmemblk by setting the
 *   FIO_PMEMBLK_LIB environment variable to the full path to the desired
 *   libpmemblk.so.
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/uio.h>
#include <errno.h>
#include <assert.h>
#include <dlfcn.h>
#include <string.h>

#include "../fio.h"

/*
 * libpmemblk
 */
struct PMEMblkpool_s;
typedef struct PMEMblkpool_s PMEMblkpool;

static PMEMblkpool *(*pmemblk_create) (const char *, size_t, size_t, mode_t);
static PMEMblkpool *(*pmemblk_open) (const char *, size_t);
static void (*pmemblk_close) (PMEMblkpool *);
static size_t(*pmemblk_nblock) (PMEMblkpool *);
static size_t(*pmemblk_bsize) (PMEMblkpool *);
static int (*pmemblk_read) (PMEMblkpool *, void *, off_t);
static int (*pmemblk_write) (PMEMblkpool *, const void *, off_t);

int load_libpmemblk(const char *path)
{
	void *dl;

	if (!path)
		path = "libpmemblk.so";

	dl = dlopen(path, RTLD_NOW | RTLD_NODELETE);
	if (!dl)
		goto errorout;

	pmemblk_create = dlsym(dl, "pmemblk_create");
	if (!pmemblk_create)
		goto errorout;
	pmemblk_open = dlsym(dl, "pmemblk_open");
	if (!pmemblk_open)
		goto errorout;
	pmemblk_close = dlsym(dl, "pmemblk_close");
	if (!pmemblk_close)
		goto errorout;
	pmemblk_nblock = dlsym(dl, "pmemblk_nblock");
	if (!pmemblk_nblock)
		goto errorout;
	pmemblk_bsize = dlsym(dl, "pmemblk_bsize");
	if (!pmemblk_bsize)
		goto errorout;
	pmemblk_read = dlsym(dl, "pmemblk_read");
	if (!pmemblk_read)
		goto errorout;
	pmemblk_write = dlsym(dl, "pmemblk_write");
	if (!pmemblk_write)
		goto errorout;

	return 0;

errorout:
	log_err("fio: unable to load libpmemblk: %s\n", dlerror());
	if (dl)
		dlclose(dl);

	return -1;
}

typedef struct fio_pmemblk_file *fio_pmemblk_file_t;

struct fio_pmemblk_file {
	fio_pmemblk_file_t pmb_next;
	char *pmb_filename;
	uint64_t pmb_refcnt;
	PMEMblkpool *pmb_pool;
	size_t pmb_bsize;
	size_t pmb_nblocks;
};
#define FIOFILEPMBSET(_f, _v)  do {                 \
	(_f)->engine_data = (uint64_t)(uintptr_t)(_v);  \
} while(0)
#define FIOFILEPMBGET(_f)  ((fio_pmemblk_file_t)((_f)->engine_data))

static fio_pmemblk_file_t Cache;

static pthread_mutex_t CacheLock = PTHREAD_MUTEX_INITIALIZER;

#define PMB_CREATE   (0x0001)	/* should create file */

fio_pmemblk_file_t fio_pmemblk_cache_lookup(const char *filename)
{
	fio_pmemblk_file_t i;

	for (i = Cache; i != NULL; i = i->pmb_next)
		if (!strcmp(filename, i->pmb_filename))
			return i;

	return NULL;
}

static void fio_pmemblk_cache_insert(fio_pmemblk_file_t pmb)
{
	pmb->pmb_next = Cache;
	Cache = pmb;
}

static void fio_pmemblk_cache_remove(fio_pmemblk_file_t pmb)
{
	fio_pmemblk_file_t i;

	if (pmb == Cache) {
		Cache = Cache->pmb_next;
		pmb->pmb_next = NULL;
		return;
	}

	for (i = Cache; i != NULL; i = i->pmb_next)
		if (pmb == i->pmb_next) {
			i->pmb_next = i->pmb_next->pmb_next;
			pmb->pmb_next = NULL;
			return;
		}
}

/*
 * to control block size and gross file size at the libpmemblk
 * level, we allow the block size and file size to be appended
 * to the file name:
 *
 *   path[,bsize,fsizemb]
 *
 * note that we do not use the fio option "filesize" to dictate
 * the file size because we can only give libpmemblk the gross
 * file size, which is different from the net or usable file
 * size (which is probably what fio wants).
 *
 * the final path without the parameters is returned in ppath.
 * the block size and file size are returned in pbsize and fsize.
 *
 * note that the user should specify the file size in MiB, but
 * we return bytes from here.
 */
static void pmb_parse_path(const char *pathspec, char **ppath, uint64_t *pbsize,
			   uint64_t *pfsize)
{
	char *path;
	char *s;
	uint64_t bsize;
	uint64_t fsizemb;

	path = strdup(pathspec);
	if (!path) {
		*ppath = NULL;
		return;
	}

	/* extract sizes, if given */
	s = strrchr(path, ',');
	if (s && (fsizemb = strtoull(s + 1, NULL, 10))) {
		*s = 0;
		s = strrchr(path, ',');
		if (s && (bsize = strtoull(s + 1, NULL, 10))) {
			*s = 0;
			*ppath = path;
			*pbsize = bsize;
			*pfsize = fsizemb << 20;
			return;
		}
	}

	/* size specs not found */
	strcpy(path, pathspec);
	*ppath = path;
	*pbsize = 0;
	*pfsize = 0;
}

static fio_pmemblk_file_t pmb_open(const char *pathspec, int flags)
{
	fio_pmemblk_file_t pmb;
	char *path = NULL;
	uint64_t bsize = 0;
	uint64_t fsize = 0;

	pmb_parse_path(pathspec, &path, &bsize, &fsize);
	if (!path)
		return NULL;

	pthread_mutex_lock(&CacheLock);

	pmb = fio_pmemblk_cache_lookup(path);
	if (!pmb) {
		/* load libpmemblk if needed */
		if (!pmemblk_open)
			if (load_libpmemblk(getenv("FIO_PMEMBLK_LIB")))
				goto error;

		pmb = malloc(sizeof(*pmb));
		if (!pmb)
			goto error;

		/* try opening existing first, create it if needed */
		pmb->pmb_pool = pmemblk_open(path, bsize);
		if (!pmb->pmb_pool && (errno == ENOENT) &&
		    (flags & PMB_CREATE) && (0 < fsize) && (0 < bsize)) {
			pmb->pmb_pool =
			    pmemblk_create(path, bsize, fsize, 0644);
		}
		if (!pmb->pmb_pool) {
			log_err
			    ("fio: enable to open pmemblk pool file (errno %d)\n",
			     errno);
			goto error;
		}

		pmb->pmb_filename = path;
		pmb->pmb_next = NULL;
		pmb->pmb_refcnt = 0;
		pmb->pmb_bsize = pmemblk_bsize(pmb->pmb_pool);
		pmb->pmb_nblocks = pmemblk_nblock(pmb->pmb_pool);

		fio_pmemblk_cache_insert(pmb);
	}

	pmb->pmb_refcnt += 1;

	pthread_mutex_unlock(&CacheLock);

	return pmb;

error:
	if (pmb) {
		if (pmb->pmb_pool)
			pmemblk_close(pmb->pmb_pool);
		pmb->pmb_pool = NULL;
		pmb->pmb_filename = NULL;
		free(pmb);
	}
	if (path)
		free(path);

	pthread_mutex_unlock(&CacheLock);
	return NULL;
}

static void pmb_close(fio_pmemblk_file_t pmb, const bool keep)
{
	pthread_mutex_lock(&CacheLock);

	pmb->pmb_refcnt--;

	if (!keep && !pmb->pmb_refcnt) {
		pmemblk_close(pmb->pmb_pool);
		pmb->pmb_pool = NULL;
		free(pmb->pmb_filename);
		pmb->pmb_filename = NULL;
		fio_pmemblk_cache_remove(pmb);
		free(pmb);
	}

	pthread_mutex_unlock(&CacheLock);
}

static int pmb_get_flags(struct thread_data *td, uint64_t *pflags)
{
	static int thread_warned = 0;
	static int odirect_warned = 0;

	uint64_t flags = 0;

	if (!td->o.use_thread) {
		if (!thread_warned) {
			thread_warned = 1;
			log_err("fio: must set thread=1 for pmemblk engine\n");
		}
		return 1;
	}

	if (!td->o.odirect && !odirect_warned) {
		odirect_warned = 1;
		log_info("fio: direct == 0, but pmemblk is always direct\n");
	}

	if (td->o.allow_create)
		flags |= PMB_CREATE;

	(*pflags) = flags;
	return 0;
}

static int fio_pmemblk_open_file(struct thread_data *td, struct fio_file *f)
{
	uint64_t flags = 0;
	fio_pmemblk_file_t pmb;

	if (pmb_get_flags(td, &flags))
		return 1;

	pmb = pmb_open(f->file_name, flags);
	if (!pmb)
		return 1;

	FIOFILEPMBSET(f, pmb);
	return 0;
}

static int fio_pmemblk_close_file(struct thread_data fio_unused *td,
				  struct fio_file *f)
{
	fio_pmemblk_file_t pmb = FIOFILEPMBGET(f);

	if (pmb)
		pmb_close(pmb, false);

	FIOFILEPMBSET(f, NULL);
	return 0;
}

static int fio_pmemblk_get_file_size(struct thread_data *td, struct fio_file *f)
{
	uint64_t flags = 0;
	fio_pmemblk_file_t pmb = FIOFILEPMBGET(f);

	if (fio_file_size_known(f))
		return 0;

	if (!pmb) {
		if (pmb_get_flags(td, &flags))
			return 1;
		pmb = pmb_open(f->file_name, flags);
		if (!pmb)
			return 1;
	}

	f->real_file_size = pmb->pmb_bsize * pmb->pmb_nblocks;

	fio_file_set_size_known(f);

	if (!FIOFILEPMBGET(f))
		pmb_close(pmb, true);

	return 0;
}

static int fio_pmemblk_queue(struct thread_data *td, struct io_u *io_u)
{
	struct fio_file *f = io_u->file;
	fio_pmemblk_file_t pmb = FIOFILEPMBGET(f);

	unsigned long long off;
	unsigned long len;
	void *buf;
	int (*blkop) (PMEMblkpool *, void *, off_t) = (void *)pmemblk_write;

	fio_ro_check(td, io_u);

	switch (io_u->ddir) {
	case DDIR_READ:
		blkop = pmemblk_read;
		/* fall through */
	case DDIR_WRITE:
		off = io_u->offset;
		len = io_u->xfer_buflen;

		io_u->error = EINVAL;
		if (off % pmb->pmb_bsize)
			break;
		if (len % pmb->pmb_bsize)
			break;
		if ((off + len) / pmb->pmb_bsize > pmb->pmb_nblocks)
			break;

		io_u->error = 0;
		buf = io_u->xfer_buf;
		off /= pmb->pmb_bsize;
		len /= pmb->pmb_bsize;
		while (0 < len) {
			if (0 != blkop(pmb->pmb_pool, buf, off)) {
				io_u->error = errno;
				break;
			}
			buf += pmb->pmb_bsize;
			off++;
			len--;
		}
		off *= pmb->pmb_bsize;
		len *= pmb->pmb_bsize;
		io_u->resid = io_u->xfer_buflen - (off - io_u->offset);
		break;
	case DDIR_SYNC:
	case DDIR_DATASYNC:
	case DDIR_SYNC_FILE_RANGE:
		/* we're always sync'd */
		io_u->error = 0;
		break;
	default:
		io_u->error = EINVAL;
		break;
	}

	return FIO_Q_COMPLETED;
}

static int fio_pmemblk_unlink_file(struct thread_data *td, struct fio_file *f)
{
	char *path = NULL;
	uint64_t bsize = 0;
	uint64_t fsize = 0;

	/*
	 * we need our own unlink in case the user has specified
	 * the block and file sizes in the path name.  we parse
	 * the file_name to determine the file name we actually used.
	 */

	pmb_parse_path(f->file_name, &path, &bsize, &fsize);
	if (!path)
		return ENOENT;

	unlink(path);
	free(path);
	return 0;
}

struct ioengine_ops ioengine = {
	.name = "pmemblk",
	.version = FIO_IOOPS_VERSION,
	.queue = fio_pmemblk_queue,
	.open_file = fio_pmemblk_open_file,
	.close_file = fio_pmemblk_close_file,
	.get_file_size = fio_pmemblk_get_file_size,
	.unlink_file = fio_pmemblk_unlink_file,
	.flags = FIO_SYNCIO | FIO_DISKLESSIO | FIO_NOEXTEND | FIO_NODISKUTIL,
};

static void fio_init fio_pmemblk_register(void)
{
	register_ioengine(&ioengine);
}

static void fio_exit fio_pmemblk_unregister(void)
{
	unregister_ioengine(&ioengine);
}
Commit	Line	Data
	1	/*
	2	* pmemblk: IO engine that uses NVML libpmemblk to read and write data
	3	*
	4	* Copyright (C) 2016 Hewlett Packard Enterprise Development LP
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License,
	8	* version 2 as published by the Free Software Foundation..
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public
	16	* License along with this program; if not, write to the Free
	17	* Software Foundation, Inc., 59 Temple Place, Suite 330,
	18	* Boston, MA 02111-1307 USA
	19	*/
	20
	21	/*
	22	* pmemblk engine
	23	*
	24	* IO engine that uses libpmemblk to read and write data
	25	*
	26	* To use:
	27	* ioengine=pmemblk
	28	*
	29	* Other relevant settings:
	30	* iodepth=1
	31	* direct=1
	32	* thread=1 REQUIRED
	33	* unlink=1
	34	* filename=/pmem0/fiotestfile,BSIZE,FSIZEMB
	35	*
	36	* thread must be set to 1 for pmemblk as multiple processes cannot
	37	* open the same block pool file.
	38	*
	39	* iodepth should be set to 1 as pmemblk is always synchronous.
	40	* Use numjobs to scale up.
	41	*
	42	* direct=1 is implied as pmemblk is always direct.
	43	*
	44	* Can set unlink to 1 to remove the block pool file after testing.
	45	*
	46	* When specifying the filename, if the block pool file does not already
	47	* exist, then the pmemblk engine can create the pool file if you specify
	48	* the block and file sizes. BSIZE is the block size in bytes.
	49	* FSIZEMB is the pool file size in MB.
	50	*
	51	* See examples/pmemblk.fio for more.
	52	*
	53	* libpmemblk.so
	54	* By default, the pmemblk engine will let the system find the libpmemblk.so
	55	* that it uses. You can use an alternative libpmemblk by setting the
	56	* FIO_PMEMBLK_LIB environment variable to the full path to the desired
	57	* libpmemblk.so.
	58	*
	59	*/
	60
	61	#include <stdio.h>
	62	#include <stdlib.h>
	63	#include <unistd.h>
	64	#include <sys/uio.h>
	65	#include <errno.h>
	66	#include <assert.h>
	67	#include <dlfcn.h>
	68	#include <string.h>
	69
	70	#include "../fio.h"
	71
	72	/*
	73	* libpmemblk
	74	*/
	75	struct PMEMblkpool_s;
	76	typedef struct PMEMblkpool_s PMEMblkpool;
	77
	78	static PMEMblkpool (pmemblk_create) (const char *, size_t, size_t, mode_t);
	79	static PMEMblkpool (pmemblk_open) (const char *, size_t);
	80	static void (pmemblk_close) (PMEMblkpool );
	81	static size_t(pmemblk_nblock) (PMEMblkpool );
	82	static size_t(pmemblk_bsize) (PMEMblkpool );
	83	static int (pmemblk_read) (PMEMblkpool , void *, off_t);
	84	static int (pmemblk_write) (PMEMblkpool , const void *, off_t);
	85
	86	int load_libpmemblk(const char *path)
	87	{
	88	void *dl;
	89
	90	if (!path)
	91	path = "libpmemblk.so";
	92
	93	dl = dlopen(path, RTLD_NOW \| RTLD_NODELETE);
	94	if (!dl)
	95	goto errorout;
	96
	97	pmemblk_create = dlsym(dl, "pmemblk_create");
	98	if (!pmemblk_create)
	99	goto errorout;
	100	pmemblk_open = dlsym(dl, "pmemblk_open");
	101	if (!pmemblk_open)
	102	goto errorout;
	103	pmemblk_close = dlsym(dl, "pmemblk_close");
	104	if (!pmemblk_close)
	105	goto errorout;
	106	pmemblk_nblock = dlsym(dl, "pmemblk_nblock");
	107	if (!pmemblk_nblock)
	108	goto errorout;
	109	pmemblk_bsize = dlsym(dl, "pmemblk_bsize");
	110	if (!pmemblk_bsize)
	111	goto errorout;
	112	pmemblk_read = dlsym(dl, "pmemblk_read");
	113	if (!pmemblk_read)
	114	goto errorout;
	115	pmemblk_write = dlsym(dl, "pmemblk_write");
	116	if (!pmemblk_write)
	117	goto errorout;
	118
	119	return 0;
	120
	121	errorout:
	122	log_err("fio: unable to load libpmemblk: %s\n", dlerror());
	123	if (dl)
	124	dlclose(dl);
	125
	126	return -1;
	127	}
	128
	129	typedef struct fio_pmemblk_file *fio_pmemblk_file_t;
	130
	131	struct fio_pmemblk_file {
	132	fio_pmemblk_file_t pmb_next;
	133	char *pmb_filename;
	134	uint64_t pmb_refcnt;
	135	PMEMblkpool *pmb_pool;
	136	size_t pmb_bsize;
	137	size_t pmb_nblocks;
	138	};
	139	#define FIOFILEPMBSET(_f, _v) do { \
	140	(_f)->engine_data = (uint64_t)(uintptr_t)(_v); \
	141	} while(0)
	142	#define FIOFILEPMBGET(_f) ((fio_pmemblk_file_t)((_f)->engine_data))
	143
	144	static fio_pmemblk_file_t Cache;
	145
	146	static pthread_mutex_t CacheLock = PTHREAD_MUTEX_INITIALIZER;
	147
	148	#define PMB_CREATE (0x0001) /* should create file */
	149
	150	fio_pmemblk_file_t fio_pmemblk_cache_lookup(const char *filename)
	151	{
	152	fio_pmemblk_file_t i;
	153
	154	for (i = Cache; i != NULL; i = i->pmb_next)
	155	if (!strcmp(filename, i->pmb_filename))
	156	return i;
	157
	158	return NULL;
	159	}
	160
	161	static void fio_pmemblk_cache_insert(fio_pmemblk_file_t pmb)
	162	{
	163	pmb->pmb_next = Cache;
	164	Cache = pmb;
	165	}
	166
	167	static void fio_pmemblk_cache_remove(fio_pmemblk_file_t pmb)
	168	{
	169	fio_pmemblk_file_t i;
	170
	171	if (pmb == Cache) {
	172	Cache = Cache->pmb_next;
	173	pmb->pmb_next = NULL;
	174	return;
	175	}
	176
	177	for (i = Cache; i != NULL; i = i->pmb_next)
	178	if (pmb == i->pmb_next) {
	179	i->pmb_next = i->pmb_next->pmb_next;
	180	pmb->pmb_next = NULL;
	181	return;
	182	}
	183	}
	184
	185	/*
	186	* to control block size and gross file size at the libpmemblk
	187	* level, we allow the block size and file size to be appended
	188	* to the file name:
	189	*
	190	* path[,bsize,fsizemb]
	191	*
	192	* note that we do not use the fio option "filesize" to dictate
	193	* the file size because we can only give libpmemblk the gross
	194	* file size, which is different from the net or usable file
	195	* size (which is probably what fio wants).
	196	*
	197	* the final path without the parameters is returned in ppath.
	198	* the block size and file size are returned in pbsize and fsize.
	199	*
	200	* note that the user should specify the file size in MiB, but
	201	* we return bytes from here.
	202	*/
	203	static void pmb_parse_path(const char pathspec, char ppath, uint64_t pbsize,
	204	uint64_t *pfsize)
	205	{
	206	char *path;
	207	char *s;
	208	uint64_t bsize;
	209	uint64_t fsizemb;
	210
	211	path = strdup(pathspec);
	212	if (!path) {
	213	*ppath = NULL;
	214	return;
	215	}
	216
	217	/* extract sizes, if given */
	218	s = strrchr(path, ',');
	219	if (s && (fsizemb = strtoull(s + 1, NULL, 10))) {
	220	*s = 0;
	221	s = strrchr(path, ',');
	222	if (s && (bsize = strtoull(s + 1, NULL, 10))) {
	223	*s = 0;
	224	*ppath = path;
	225	*pbsize = bsize;
	226	*pfsize = fsizemb << 20;
	227	return;
	228	}
	229	}
	230
	231	/* size specs not found */
	232	strcpy(path, pathspec);
	233	*ppath = path;
	234	*pbsize = 0;
	235	*pfsize = 0;
	236	}
	237
	238	static fio_pmemblk_file_t pmb_open(const char *pathspec, int flags)
	239	{
	240	fio_pmemblk_file_t pmb;
	241	char *path = NULL;
	242	uint64_t bsize = 0;
	243	uint64_t fsize = 0;
	244
	245	pmb_parse_path(pathspec, &path, &bsize, &fsize);
	246	if (!path)
	247	return NULL;
	248
	249	pthread_mutex_lock(&CacheLock);
	250
	251	pmb = fio_pmemblk_cache_lookup(path);
	252	if (!pmb) {
	253	/* load libpmemblk if needed */
	254	if (!pmemblk_open)
	255	if (load_libpmemblk(getenv("FIO_PMEMBLK_LIB")))
	256	goto error;
	257
	258	pmb = malloc(sizeof(*pmb));
	259	if (!pmb)
	260	goto error;
	261
	262	/* try opening existing first, create it if needed */
	263	pmb->pmb_pool = pmemblk_open(path, bsize);
	264	if (!pmb->pmb_pool && (errno == ENOENT) &&
	265	(flags & PMB_CREATE) && (0 < fsize) && (0 < bsize)) {
	266	pmb->pmb_pool =
	267	pmemblk_create(path, bsize, fsize, 0644);
	268	}
	269	if (!pmb->pmb_pool) {
	270	log_err
	271	("fio: enable to open pmemblk pool file (errno %d)\n",
	272	errno);
	273	goto error;
	274	}
	275
	276	pmb->pmb_filename = path;
	277	pmb->pmb_next = NULL;
	278	pmb->pmb_refcnt = 0;
	279	pmb->pmb_bsize = pmemblk_bsize(pmb->pmb_pool);
	280	pmb->pmb_nblocks = pmemblk_nblock(pmb->pmb_pool);
	281
	282	fio_pmemblk_cache_insert(pmb);
	283	}
	284
	285	pmb->pmb_refcnt += 1;
	286
	287	pthread_mutex_unlock(&CacheLock);
	288
	289	return pmb;
	290
	291	error:
	292	if (pmb) {
	293	if (pmb->pmb_pool)
	294	pmemblk_close(pmb->pmb_pool);
	295	pmb->pmb_pool = NULL;
	296	pmb->pmb_filename = NULL;
	297	free(pmb);
	298	}
	299	if (path)
	300	free(path);
	301
	302	pthread_mutex_unlock(&CacheLock);
	303	return NULL;
	304	}
	305
	306	static void pmb_close(fio_pmemblk_file_t pmb, const bool keep)
	307	{
	308	pthread_mutex_lock(&CacheLock);
	309
	310	pmb->pmb_refcnt--;
	311
	312	if (!keep && !pmb->pmb_refcnt) {
	313	pmemblk_close(pmb->pmb_pool);
	314	pmb->pmb_pool = NULL;
	315	free(pmb->pmb_filename);
	316	pmb->pmb_filename = NULL;
	317	fio_pmemblk_cache_remove(pmb);
	318	free(pmb);
	319	}
	320
	321	pthread_mutex_unlock(&CacheLock);
	322	}
	323
	324	static int pmb_get_flags(struct thread_data td, uint64_t pflags)
	325	{
	326	static int thread_warned = 0;
	327	static int odirect_warned = 0;
	328
	329	uint64_t flags = 0;
	330
	331	if (!td->o.use_thread) {
	332	if (!thread_warned) {
	333	thread_warned = 1;
	334	log_err("fio: must set thread=1 for pmemblk engine\n");
	335	}
	336	return 1;
	337	}
	338
	339	if (!td->o.odirect && !odirect_warned) {
	340	odirect_warned = 1;
	341	log_info("fio: direct == 0, but pmemblk is always direct\n");
	342	}
	343
	344	if (td->o.allow_create)
	345	flags \|= PMB_CREATE;
	346
	347	(*pflags) = flags;
	348	return 0;
	349	}
	350
	351	static int fio_pmemblk_open_file(struct thread_data td, struct fio_file f)
	352	{
	353	uint64_t flags = 0;
	354	fio_pmemblk_file_t pmb;
	355
	356	if (pmb_get_flags(td, &flags))
	357	return 1;
	358
	359	pmb = pmb_open(f->file_name, flags);
	360	if (!pmb)
	361	return 1;
	362
	363	FIOFILEPMBSET(f, pmb);
	364	return 0;
	365	}
	366
	367	static int fio_pmemblk_close_file(struct thread_data fio_unused *td,
	368	struct fio_file *f)
	369	{
	370	fio_pmemblk_file_t pmb = FIOFILEPMBGET(f);
	371
	372	if (pmb)
	373	pmb_close(pmb, false);
	374
	375	FIOFILEPMBSET(f, NULL);
	376	return 0;
	377	}
	378
	379	static int fio_pmemblk_get_file_size(struct thread_data td, struct fio_file f)
	380	{
	381	uint64_t flags = 0;
	382	fio_pmemblk_file_t pmb = FIOFILEPMBGET(f);
	383
	384	if (fio_file_size_known(f))
	385	return 0;
	386
	387	if (!pmb) {
	388	if (pmb_get_flags(td, &flags))
	389	return 1;
	390	pmb = pmb_open(f->file_name, flags);
	391	if (!pmb)
	392	return 1;
	393	}
	394
	395	f->real_file_size = pmb->pmb_bsize * pmb->pmb_nblocks;
	396
	397	fio_file_set_size_known(f);
	398
	399	if (!FIOFILEPMBGET(f))
	400	pmb_close(pmb, true);
	401
	402	return 0;
	403	}
	404
	405	static int fio_pmemblk_queue(struct thread_data td, struct io_u io_u)
	406	{
	407	struct fio_file *f = io_u->file;
	408	fio_pmemblk_file_t pmb = FIOFILEPMBGET(f);
	409
	410	unsigned long long off;
	411	unsigned long len;
	412	void *buf;
	413	int (blkop) (PMEMblkpool , void , off_t) = (void )pmemblk_write;
	414
	415	fio_ro_check(td, io_u);
	416
	417	switch (io_u->ddir) {
	418	case DDIR_READ:
	419	blkop = pmemblk_read;
	420	/* fall through */
	421	case DDIR_WRITE:
	422	off = io_u->offset;
	423	len = io_u->xfer_buflen;
	424
	425	io_u->error = EINVAL;
	426	if (off % pmb->pmb_bsize)
	427	break;
	428	if (len % pmb->pmb_bsize)
	429	break;
	430	if ((off + len) / pmb->pmb_bsize > pmb->pmb_nblocks)
	431	break;
	432
	433	io_u->error = 0;
	434	buf = io_u->xfer_buf;
	435	off /= pmb->pmb_bsize;
	436	len /= pmb->pmb_bsize;
	437	while (0 < len) {
	438	if (0 != blkop(pmb->pmb_pool, buf, off)) {
	439	io_u->error = errno;
	440	break;
	441	}
	442	buf += pmb->pmb_bsize;
	443	off++;
	444	len--;
	445	}
	446	off *= pmb->pmb_bsize;
	447	len *= pmb->pmb_bsize;
	448	io_u->resid = io_u->xfer_buflen - (off - io_u->offset);
	449	break;
	450	case DDIR_SYNC:
	451	case DDIR_DATASYNC:
	452	case DDIR_SYNC_FILE_RANGE:
	453	/* we're always sync'd */
	454	io_u->error = 0;
	455	break;
	456	default:
	457	io_u->error = EINVAL;
	458	break;
	459	}
	460
	461	return FIO_Q_COMPLETED;
	462	}
	463
	464	static int fio_pmemblk_unlink_file(struct thread_data td, struct fio_file f)
	465	{
	466	char *path = NULL;
	467	uint64_t bsize = 0;
	468	uint64_t fsize = 0;
	469
	470	/*
	471	* we need our own unlink in case the user has specified
	472	* the block and file sizes in the path name. we parse
	473	* the file_name to determine the file name we actually used.
	474	*/
	475
	476	pmb_parse_path(f->file_name, &path, &bsize, &fsize);
	477	if (!path)
	478	return ENOENT;
	479
	480	unlink(path);
	481	free(path);
	482	return 0;
	483	}
	484
	485	struct ioengine_ops ioengine = {
	486	.name = "pmemblk",
	487	.version = FIO_IOOPS_VERSION,
	488	.queue = fio_pmemblk_queue,
	489	.open_file = fio_pmemblk_open_file,
	490	.close_file = fio_pmemblk_close_file,
	491	.get_file_size = fio_pmemblk_get_file_size,
	492	.unlink_file = fio_pmemblk_unlink_file,
	493	.flags = FIO_SYNCIO \| FIO_DISKLESSIO \| FIO_NOEXTEND \| FIO_NODISKUTIL,
	494	};
	495
	496	static void fio_init fio_pmemblk_register(void)
	497	{
	498	register_ioengine(&ioengine);
	499	}
	500
	501	static void fio_exit fio_pmemblk_unregister(void)
	502	{
	503	unregister_ioengine(&ioengine);
	504	}