[linux-2.6-block.git] / drivers / nvme / target / io-cmd-file.c

// SPDX-License-Identifier: GPL-2.0
/*
 * NVMe Over Fabrics Target File I/O commands implementation.
 * Copyright (c) 2017-2018 Western Digital Corporation or its
 * affiliates.
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/uio.h>
#include <linux/falloc.h>
#include <linux/file.h>
#include "nvmet.h"

#define NVMET_MAX_MPOOL_BVEC		16
#define NVMET_MIN_MPOOL_OBJ		16

void nvmet_file_ns_disable(struct nvmet_ns *ns)
{
	if (ns->file) {
		if (ns->buffered_io)
			flush_workqueue(buffered_io_wq);
		mempool_destroy(ns->bvec_pool);
		ns->bvec_pool = NULL;
		kmem_cache_destroy(ns->bvec_cache);
		ns->bvec_cache = NULL;
		fput(ns->file);
		ns->file = NULL;
	}
}

int nvmet_file_ns_enable(struct nvmet_ns *ns)
{
	int flags = O_RDWR | O_LARGEFILE;
	struct kstat stat;
	int ret;

	if (!ns->buffered_io)
		flags |= O_DIRECT;

	ns->file = filp_open(ns->device_path, flags, 0);
	if (IS_ERR(ns->file)) {
		pr_err("failed to open file %s: (%ld)\n",
				ns->device_path, PTR_ERR(ns->file));
		return PTR_ERR(ns->file);
	}

	ret = vfs_getattr(&ns->file->f_path,
			&stat, STATX_SIZE, AT_STATX_FORCE_SYNC);
	if (ret)
		goto err;

	ns->size = stat.size;
	ns->blksize_shift = file_inode(ns->file)->i_blkbits;

	ns->bvec_cache = kmem_cache_create("nvmet-bvec",
			NVMET_MAX_MPOOL_BVEC * sizeof(struct bio_vec),
			0, SLAB_HWCACHE_ALIGN, NULL);
	if (!ns->bvec_cache) {
		ret = -ENOMEM;
		goto err;
	}

	ns->bvec_pool = mempool_create(NVMET_MIN_MPOOL_OBJ, mempool_alloc_slab,
			mempool_free_slab, ns->bvec_cache);

	if (!ns->bvec_pool) {
		ret = -ENOMEM;
		goto err;
	}

	return ret;
err:
	ns->size = 0;
	ns->blksize_shift = 0;
	nvmet_file_ns_disable(ns);
	return ret;
}

static void nvmet_file_init_bvec(struct bio_vec *bv, struct sg_page_iter *iter)
{
	bv->bv_page = sg_page_iter_page(iter);
	bv->bv_offset = iter->sg->offset;
	bv->bv_len = PAGE_SIZE - iter->sg->offset;
}

static ssize_t nvmet_file_submit_bvec(struct nvmet_req *req, loff_t pos,
		unsigned long nr_segs, size_t count)
{
	struct kiocb *iocb = &req->f.iocb;
	ssize_t (*call_iter)(struct kiocb *iocb, struct iov_iter *iter);
	struct iov_iter iter;
	int ki_flags = 0, rw;
	ssize_t ret;

	if (req->cmd->rw.opcode == nvme_cmd_write) {
		if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))
			ki_flags = IOCB_DSYNC;
		call_iter = req->ns->file->f_op->write_iter;
		rw = WRITE;
	} else {
		call_iter = req->ns->file->f_op->read_iter;
		rw = READ;
	}

	iov_iter_bvec(&iter, ITER_BVEC | rw, req->f.bvec, nr_segs, count);

	iocb->ki_pos = pos;
	iocb->ki_filp = req->ns->file;
	iocb->ki_flags = ki_flags | iocb_flags(req->ns->file);

	ret = call_iter(iocb, &iter);

	if (ret != -EIOCBQUEUED && iocb->ki_complete)
		iocb->ki_complete(iocb, ret, 0);

	return ret;
}

static void nvmet_file_io_done(struct kiocb *iocb, long ret, long ret2)
{
	struct nvmet_req *req = container_of(iocb, struct nvmet_req, f.iocb);

	if (req->f.bvec != req->inline_bvec) {
		if (likely(req->f.mpool_alloc == false))
			kfree(req->f.bvec);
		else
			mempool_free(req->f.bvec, req->ns->bvec_pool);
	}

	nvmet_req_complete(req, ret != req->data_len ?
			NVME_SC_INTERNAL | NVME_SC_DNR : 0);
}

static void nvmet_file_execute_rw(struct nvmet_req *req)
{
	ssize_t nr_bvec = DIV_ROUND_UP(req->data_len, PAGE_SIZE);
	struct sg_page_iter sg_pg_iter;
	unsigned long bv_cnt = 0;
	bool is_sync = false;
	size_t len = 0, total_len = 0;
	ssize_t ret = 0;
	loff_t pos;

	if (!req->sg_cnt || !nr_bvec) {
		nvmet_req_complete(req, 0);
		return;
	}

	pos = le64_to_cpu(req->cmd->rw.slba) << req->ns->blksize_shift;
	if (unlikely(pos + req->data_len > req->ns->size)) {
		nvmet_req_complete(req, NVME_SC_LBA_RANGE | NVME_SC_DNR);
		return;
	}

	if (nr_bvec > NVMET_MAX_INLINE_BIOVEC)
		req->f.bvec = kmalloc_array(nr_bvec, sizeof(struct bio_vec),
				GFP_KERNEL);
	else
		req->f.bvec = req->inline_bvec;

	req->f.mpool_alloc = false;
	if (unlikely(!req->f.bvec)) {
		/* fallback under memory pressure */
		req->f.bvec = mempool_alloc(req->ns->bvec_pool, GFP_KERNEL);
		req->f.mpool_alloc = true;
		if (nr_bvec > NVMET_MAX_MPOOL_BVEC)
			is_sync = true;
	}

	memset(&req->f.iocb, 0, sizeof(struct kiocb));
	for_each_sg_page(req->sg, &sg_pg_iter, req->sg_cnt, 0) {
		nvmet_file_init_bvec(&req->f.bvec[bv_cnt], &sg_pg_iter);
		len += req->f.bvec[bv_cnt].bv_len;
		total_len += req->f.bvec[bv_cnt].bv_len;
		bv_cnt++;

		WARN_ON_ONCE((nr_bvec - 1) < 0);

		if (unlikely(is_sync) &&
		    (nr_bvec - 1 == 0 || bv_cnt == NVMET_MAX_MPOOL_BVEC)) {
			ret = nvmet_file_submit_bvec(req, pos, bv_cnt, len);
			if (ret < 0)
				goto out;
			pos += len;
			bv_cnt = 0;
			len = 0;
		}
		nr_bvec--;
	}

	if (WARN_ON_ONCE(total_len != req->data_len))
		ret = -EIO;
out:
	if (unlikely(is_sync || ret)) {
		nvmet_file_io_done(&req->f.iocb, ret < 0 ? ret : total_len, 0);
		return;
	}
	req->f.iocb.ki_complete = nvmet_file_io_done;
	nvmet_file_submit_bvec(req, pos, bv_cnt, total_len);
}

static void nvmet_file_buffered_io_work(struct work_struct *w)
{
	struct nvmet_req *req = container_of(w, struct nvmet_req, f.work);

	nvmet_file_execute_rw(req);
}

static void nvmet_file_execute_rw_buffered_io(struct nvmet_req *req)
{
	INIT_WORK(&req->f.work, nvmet_file_buffered_io_work);
	queue_work(buffered_io_wq, &req->f.work);
}

u16 nvmet_file_flush(struct nvmet_req *req)
{
	if (vfs_fsync(req->ns->file, 1) < 0)
		return NVME_SC_INTERNAL | NVME_SC_DNR;
	return 0;
}

static void nvmet_file_flush_work(struct work_struct *w)
{
	struct nvmet_req *req = container_of(w, struct nvmet_req, f.work);

	nvmet_req_complete(req, nvmet_file_flush(req));
}

static void nvmet_file_execute_flush(struct nvmet_req *req)
{
	INIT_WORK(&req->f.work, nvmet_file_flush_work);
	schedule_work(&req->f.work);
}

static void nvmet_file_execute_discard(struct nvmet_req *req)
{
	int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
	struct nvme_dsm_range range;
	loff_t offset, len;
	u16 ret;
	int i;

	for (i = 0; i <= le32_to_cpu(req->cmd->dsm.nr); i++) {
		ret = nvmet_copy_from_sgl(req, i * sizeof(range), &range,
					sizeof(range));
		if (ret)
			break;

		offset = le64_to_cpu(range.slba) << req->ns->blksize_shift;
		len = le32_to_cpu(range.nlb) << req->ns->blksize_shift;
		if (offset + len > req->ns->size) {
			ret = NVME_SC_LBA_RANGE | NVME_SC_DNR;
			break;
		}

		if (vfs_fallocate(req->ns->file, mode, offset, len)) {
			ret = NVME_SC_INTERNAL | NVME_SC_DNR;
			break;
		}
	}

	nvmet_req_complete(req, ret);
}

static void nvmet_file_dsm_work(struct work_struct *w)
{
	struct nvmet_req *req = container_of(w, struct nvmet_req, f.work);

	switch (le32_to_cpu(req->cmd->dsm.attributes)) {
	case NVME_DSMGMT_AD:
		nvmet_file_execute_discard(req);
		return;
	case NVME_DSMGMT_IDR:
	case NVME_DSMGMT_IDW:
	default:
		/* Not supported yet */
		nvmet_req_complete(req, 0);
		return;
	}
}

static void nvmet_file_execute_dsm(struct nvmet_req *req)
{
	INIT_WORK(&req->f.work, nvmet_file_dsm_work);
	schedule_work(&req->f.work);
}

static void nvmet_file_write_zeroes_work(struct work_struct *w)
{
	struct nvmet_req *req = container_of(w, struct nvmet_req, f.work);
	struct nvme_write_zeroes_cmd *write_zeroes = &req->cmd->write_zeroes;
	int mode = FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE;
	loff_t offset;
	loff_t len;
	int ret;

	offset = le64_to_cpu(write_zeroes->slba) << req->ns->blksize_shift;
	len = (((sector_t)le16_to_cpu(write_zeroes->length) + 1) <<
			req->ns->blksize_shift);

	if (unlikely(offset + len > req->ns->size)) {
		nvmet_req_complete(req, NVME_SC_LBA_RANGE | NVME_SC_DNR);
		return;
	}

	ret = vfs_fallocate(req->ns->file, mode, offset, len);
	nvmet_req_complete(req, ret < 0 ? NVME_SC_INTERNAL | NVME_SC_DNR : 0);
}

static void nvmet_file_execute_write_zeroes(struct nvmet_req *req)
{
	INIT_WORK(&req->f.work, nvmet_file_write_zeroes_work);
	schedule_work(&req->f.work);
}

u16 nvmet_file_parse_io_cmd(struct nvmet_req *req)
{
	struct nvme_command *cmd = req->cmd;

	switch (cmd->common.opcode) {
	case nvme_cmd_read:
	case nvme_cmd_write:
		if (req->ns->buffered_io)
			req->execute = nvmet_file_execute_rw_buffered_io;
		else
			req->execute = nvmet_file_execute_rw;
		req->data_len = nvmet_rw_len(req);
		return 0;
	case nvme_cmd_flush:
		req->execute = nvmet_file_execute_flush;
		req->data_len = 0;
		return 0;
	case nvme_cmd_dsm:
		req->execute = nvmet_file_execute_dsm;
		req->data_len = (le32_to_cpu(cmd->dsm.nr) + 1) *
			sizeof(struct nvme_dsm_range);
		return 0;
	case nvme_cmd_write_zeroes:
		req->execute = nvmet_file_execute_write_zeroes;
		req->data_len = 0;
		return 0;
	default:
		pr_err("unhandled cmd for file ns %d on qid %d\n",
				cmd->common.opcode, req->sq->qid);
		return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
	}
}
Commit	Line	Data
d5eff33e CK	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* NVMe Over Fabrics Target File I/O commands implementation.
	4	* Copyright (c) 2017-2018 Western Digital Corporation or its
	5	* affiliates.
	6	*/
	7	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	8	#include <linux/uio.h>
	9	#include <linux/falloc.h>
	10	#include <linux/file.h>
	11	#include "nvmet.h"
	12
	13	#define NVMET_MAX_MPOOL_BVEC 16
	14	#define NVMET_MIN_MPOOL_OBJ 16
	15
	16	void nvmet_file_ns_disable(struct nvmet_ns *ns)
	17	{
	18	if (ns->file) {
55eb942e CK	19	if (ns->buffered_io)
55eb942e CK	20	flush_workqueue(buffered_io_wq);
d5eff33e CK	21	mempool_destroy(ns->bvec_pool);
	22	ns->bvec_pool = NULL;
	23	kmem_cache_destroy(ns->bvec_cache);
	24	ns->bvec_cache = NULL;
	25	fput(ns->file);
	26	ns->file = NULL;
	27	}
	28	}
	29
	30	int nvmet_file_ns_enable(struct nvmet_ns *ns)
	31	{
55eb942e	32	int flags = O_RDWR \| O_LARGEFILE;
d5eff33e	33	struct kstat stat;
55eb942e CK	34	int ret;
	35
	36	if (!ns->buffered_io)
	37	flags \|= O_DIRECT;
d5eff33e	38
55eb942e	39	ns->file = filp_open(ns->device_path, flags, 0);
d5eff33e CK	40	if (IS_ERR(ns->file)) {
d5eff33e CK	41	pr_err("failed to open file %s: (%ld)\n",
81cf54e0	42	ns->device_path, PTR_ERR(ns->file));
d5eff33e CK	43	return PTR_ERR(ns->file);
	44	}
	45
	46	ret = vfs_getattr(&ns->file->f_path,
	47	&stat, STATX_SIZE, AT_STATX_FORCE_SYNC);
	48	if (ret)
	49	goto err;
	50
	51	ns->size = stat.size;
	52	ns->blksize_shift = file_inode(ns->file)->i_blkbits;
	53
	54	ns->bvec_cache = kmem_cache_create("nvmet-bvec",
	55	NVMET_MAX_MPOOL_BVEC * sizeof(struct bio_vec),
	56	0, SLAB_HWCACHE_ALIGN, NULL);
1367bc82 WY	57	if (!ns->bvec_cache) {
1367bc82 WY	58	ret = -ENOMEM;
d5eff33e	59	goto err;
1367bc82	60	}
d5eff33e CK	61
	62	ns->bvec_pool = mempool_create(NVMET_MIN_MPOOL_OBJ, mempool_alloc_slab,
	63	mempool_free_slab, ns->bvec_cache);
	64
1367bc82 WY	65	if (!ns->bvec_pool) {
1367bc82 WY	66	ret = -ENOMEM;
d5eff33e	67	goto err;
1367bc82	68	}
d5eff33e CK	69
	70	return ret;
	71	err:
	72	ns->size = 0;
	73	ns->blksize_shift = 0;
	74	nvmet_file_ns_disable(ns);
	75	return ret;
	76	}
	77
	78	static void nvmet_file_init_bvec(struct bio_vec bv, struct sg_page_iter iter)
	79	{
	80	bv->bv_page = sg_page_iter_page(iter);
	81	bv->bv_offset = iter->sg->offset;
	82	bv->bv_len = PAGE_SIZE - iter->sg->offset;
	83	}
	84
	85	static ssize_t nvmet_file_submit_bvec(struct nvmet_req *req, loff_t pos,
	86	unsigned long nr_segs, size_t count)
	87	{
	88	struct kiocb *iocb = &req->f.iocb;
	89	ssize_t (call_iter)(struct kiocb iocb, struct iov_iter *iter);
	90	struct iov_iter iter;
	91	int ki_flags = 0, rw;
	92	ssize_t ret;
	93
	94	if (req->cmd->rw.opcode == nvme_cmd_write) {
	95	if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))
	96	ki_flags = IOCB_DSYNC;
	97	call_iter = req->ns->file->f_op->write_iter;
	98	rw = WRITE;
	99	} else {
	100	call_iter = req->ns->file->f_op->read_iter;
	101	rw = READ;
	102	}
	103
	104	iov_iter_bvec(&iter, ITER_BVEC \| rw, req->f.bvec, nr_segs, count);
	105
	106	iocb->ki_pos = pos;
	107	iocb->ki_filp = req->ns->file;
55eb942e	108	iocb->ki_flags = ki_flags \| iocb_flags(req->ns->file);
d5eff33e CK	109
	110	ret = call_iter(iocb, &iter);
	111
	112	if (ret != -EIOCBQUEUED && iocb->ki_complete)
	113	iocb->ki_complete(iocb, ret, 0);
	114
	115	return ret;
	116	}
	117
	118	static void nvmet_file_io_done(struct kiocb *iocb, long ret, long ret2)
	119	{
	120	struct nvmet_req *req = container_of(iocb, struct nvmet_req, f.iocb);
	121
	122	if (req->f.bvec != req->inline_bvec) {
	123	if (likely(req->f.mpool_alloc == false))
	124	kfree(req->f.bvec);
	125	else
	126	mempool_free(req->f.bvec, req->ns->bvec_pool);
	127	}
	128
	129	nvmet_req_complete(req, ret != req->data_len ?
	130	NVME_SC_INTERNAL \| NVME_SC_DNR : 0);
	131	}
	132
	133	static void nvmet_file_execute_rw(struct nvmet_req *req)
	134	{
	135	ssize_t nr_bvec = DIV_ROUND_UP(req->data_len, PAGE_SIZE);
	136	struct sg_page_iter sg_pg_iter;
	137	unsigned long bv_cnt = 0;
	138	bool is_sync = false;
	139	size_t len = 0, total_len = 0;
	140	ssize_t ret = 0;
	141	loff_t pos;
	142
	143	if (!req->sg_cnt \|\| !nr_bvec) {
	144	nvmet_req_complete(req, 0);
	145	return;
	146	}
	147
9c891c13 SG	148	pos = le64_to_cpu(req->cmd->rw.slba) << req->ns->blksize_shift;
	149	if (unlikely(pos + req->data_len > req->ns->size)) {
	150	nvmet_req_complete(req, NVME_SC_LBA_RANGE \| NVME_SC_DNR);
	151	return;
	152	}
	153
d5eff33e CK	154	if (nr_bvec > NVMET_MAX_INLINE_BIOVEC)
	155	req->f.bvec = kmalloc_array(nr_bvec, sizeof(struct bio_vec),
	156	GFP_KERNEL);
	157	else
	158	req->f.bvec = req->inline_bvec;
	159
	160	req->f.mpool_alloc = false;
	161	if (unlikely(!req->f.bvec)) {
	162	/* fallback under memory pressure */
	163	req->f.bvec = mempool_alloc(req->ns->bvec_pool, GFP_KERNEL);
	164	req->f.mpool_alloc = true;
	165	if (nr_bvec > NVMET_MAX_MPOOL_BVEC)
	166	is_sync = true;
	167	}
	168
d5eff33e CK	169	memset(&req->f.iocb, 0, sizeof(struct kiocb));
	170	for_each_sg_page(req->sg, &sg_pg_iter, req->sg_cnt, 0) {
	171	nvmet_file_init_bvec(&req->f.bvec[bv_cnt], &sg_pg_iter);
	172	len += req->f.bvec[bv_cnt].bv_len;
	173	total_len += req->f.bvec[bv_cnt].bv_len;
	174	bv_cnt++;
	175
	176	WARN_ON_ONCE((nr_bvec - 1) < 0);
	177
	178	if (unlikely(is_sync) &&
	179	(nr_bvec - 1 == 0 \|\| bv_cnt == NVMET_MAX_MPOOL_BVEC)) {
	180	ret = nvmet_file_submit_bvec(req, pos, bv_cnt, len);
	181	if (ret < 0)
	182	goto out;
	183	pos += len;
	184	bv_cnt = 0;
	185	len = 0;
	186	}
	187	nr_bvec--;
	188	}
	189
	190	if (WARN_ON_ONCE(total_len != req->data_len))
	191	ret = -EIO;
	192	out:
	193	if (unlikely(is_sync \|\| ret)) {
	194	nvmet_file_io_done(&req->f.iocb, ret < 0 ? ret : total_len, 0);
	195	return;
	196	}
	197	req->f.iocb.ki_complete = nvmet_file_io_done;
	198	nvmet_file_submit_bvec(req, pos, bv_cnt, total_len);
	199	}
	200
55eb942e CK	201	static void nvmet_file_buffered_io_work(struct work_struct *w)
	202	{
	203	struct nvmet_req *req = container_of(w, struct nvmet_req, f.work);
	204
	205	nvmet_file_execute_rw(req);
	206	}
	207
	208	static void nvmet_file_execute_rw_buffered_io(struct nvmet_req *req)
	209	{
	210	INIT_WORK(&req->f.work, nvmet_file_buffered_io_work);
	211	queue_work(buffered_io_wq, &req->f.work);
	212	}
	213
dedf0be5 CK	214	u16 nvmet_file_flush(struct nvmet_req *req)
	215	{
	216	if (vfs_fsync(req->ns->file, 1) < 0)
	217	return NVME_SC_INTERNAL \| NVME_SC_DNR;
	218	return 0;
	219	}
	220
d5eff33e CK	221	static void nvmet_file_flush_work(struct work_struct *w)
	222	{
	223	struct nvmet_req *req = container_of(w, struct nvmet_req, f.work);
d5eff33e	224
dedf0be5	225	nvmet_req_complete(req, nvmet_file_flush(req));
d5eff33e CK	226	}
	227
	228	static void nvmet_file_execute_flush(struct nvmet_req *req)
	229	{
	230	INIT_WORK(&req->f.work, nvmet_file_flush_work);
	231	schedule_work(&req->f.work);
	232	}
	233
	234	static void nvmet_file_execute_discard(struct nvmet_req *req)
	235	{
	236	int mode = FALLOC_FL_PUNCH_HOLE \| FALLOC_FL_KEEP_SIZE;
	237	struct nvme_dsm_range range;
1b72b71f SG	238	loff_t offset, len;
	239	u16 ret;
	240	int i;
d5eff33e CK	241
d5eff33e CK	242	for (i = 0; i <= le32_to_cpu(req->cmd->dsm.nr); i++) {
1b72b71f SG	243	ret = nvmet_copy_from_sgl(req, i * sizeof(range), &range,
	244	sizeof(range));
	245	if (ret)
d5eff33e	246	break;
9c891c13	247
d5eff33e CK	248	offset = le64_to_cpu(range.slba) << req->ns->blksize_shift;
d5eff33e CK	249	len = le32_to_cpu(range.nlb) << req->ns->blksize_shift;
9c891c13 SG	250	if (offset + len > req->ns->size) {
	251	ret = NVME_SC_LBA_RANGE \| NVME_SC_DNR;
	252	break;
	253	}
	254
1b72b71f SG	255	if (vfs_fallocate(req->ns->file, mode, offset, len)) {
1b72b71f SG	256	ret = NVME_SC_INTERNAL \| NVME_SC_DNR;
d5eff33e	257	break;
1b72b71f	258	}
d5eff33e CK	259	}
d5eff33e CK	260
1b72b71f	261	nvmet_req_complete(req, ret);
d5eff33e CK	262	}
	263
	264	static void nvmet_file_dsm_work(struct work_struct *w)
	265	{
	266	struct nvmet_req *req = container_of(w, struct nvmet_req, f.work);
	267
	268	switch (le32_to_cpu(req->cmd->dsm.attributes)) {
	269	case NVME_DSMGMT_AD:
	270	nvmet_file_execute_discard(req);
	271	return;
	272	case NVME_DSMGMT_IDR:
	273	case NVME_DSMGMT_IDW:
	274	default:
	275	/* Not supported yet */
	276	nvmet_req_complete(req, 0);
	277	return;
	278	}
	279	}
	280
	281	static void nvmet_file_execute_dsm(struct nvmet_req *req)
	282	{
	283	INIT_WORK(&req->f.work, nvmet_file_dsm_work);
	284	schedule_work(&req->f.work);
	285	}
	286
	287	static void nvmet_file_write_zeroes_work(struct work_struct *w)
	288	{
	289	struct nvmet_req *req = container_of(w, struct nvmet_req, f.work);
	290	struct nvme_write_zeroes_cmd *write_zeroes = &req->cmd->write_zeroes;
	291	int mode = FALLOC_FL_ZERO_RANGE \| FALLOC_FL_KEEP_SIZE;
	292	loff_t offset;
	293	loff_t len;
	294	int ret;
	295
	296	offset = le64_to_cpu(write_zeroes->slba) << req->ns->blksize_shift;
	297	len = (((sector_t)le16_to_cpu(write_zeroes->length) + 1) <<
	298	req->ns->blksize_shift);
	299
9c891c13 SG	300	if (unlikely(offset + len > req->ns->size)) {
	301	nvmet_req_complete(req, NVME_SC_LBA_RANGE \| NVME_SC_DNR);
	302	return;
	303	}
	304
d5eff33e CK	305	ret = vfs_fallocate(req->ns->file, mode, offset, len);
	306	nvmet_req_complete(req, ret < 0 ? NVME_SC_INTERNAL \| NVME_SC_DNR : 0);
	307	}
	308
	309	static void nvmet_file_execute_write_zeroes(struct nvmet_req *req)
	310	{
	311	INIT_WORK(&req->f.work, nvmet_file_write_zeroes_work);
	312	schedule_work(&req->f.work);
	313	}
	314
	315	u16 nvmet_file_parse_io_cmd(struct nvmet_req *req)
	316	{
	317	struct nvme_command *cmd = req->cmd;
	318
	319	switch (cmd->common.opcode) {
	320	case nvme_cmd_read:
	321	case nvme_cmd_write:
55eb942e CK	322	if (req->ns->buffered_io)
	323	req->execute = nvmet_file_execute_rw_buffered_io;
	324	else
	325	req->execute = nvmet_file_execute_rw;
d5eff33e CK	326	req->data_len = nvmet_rw_len(req);
	327	return 0;
	328	case nvme_cmd_flush:
	329	req->execute = nvmet_file_execute_flush;
	330	req->data_len = 0;
	331	return 0;
	332	case nvme_cmd_dsm:
	333	req->execute = nvmet_file_execute_dsm;
	334	req->data_len = (le32_to_cpu(cmd->dsm.nr) + 1) *
	335	sizeof(struct nvme_dsm_range);
	336	return 0;
	337	case nvme_cmd_write_zeroes:
	338	req->execute = nvmet_file_execute_write_zeroes;
	339	req->data_len = 0;
	340	return 0;
	341	default:
	342	pr_err("unhandled cmd for file ns %d on qid %d\n",
	343	cmd->common.opcode, req->sq->qid);
	344	return NVME_SC_INVALID_OPCODE \| NVME_SC_DNR;
	345	}
	346	}