1 // SPDX-License-Identifier: GPL-2.0
4  * Copyright (c) 2017-2018 Western Digital Corporation or its
16 void nvmet_file_ns_revalidate(struct nvmet_ns *ns)  in nvmet_file_ns_revalidate()  argument
18 	ns->size = i_size_read(ns->file->f_mapping->host);  in nvmet_file_ns_revalidate()
21 void nvmet_file_ns_disable(struct nvmet_ns *ns)  in nvmet_file_ns_disable()  argument
23 	if (ns->file) {  in nvmet_file_ns_disable()
24 		if (ns->buffered_io)  in nvmet_file_ns_disable()
26 		mempool_destroy(ns->bvec_pool);  in nvmet_file_ns_disable()
27 		ns->bvec_pool = NULL;  in nvmet_file_ns_disable()
28 		fput(ns->file);  in nvmet_file_ns_disable()
29 		ns->file = NULL;  in nvmet_file_ns_disable()
33 int nvmet_file_ns_enable(struct nvmet_ns *ns)  in nvmet_file_ns_enable()  argument
38 	if (!ns->buffered_io)  in nvmet_file_ns_enable()
41 	ns->file = filp_open(ns->device_path, flags, 0);  in nvmet_file_ns_enable()
42 	if (IS_ERR(ns->file)) {  in nvmet_file_ns_enable()
43 		ret = PTR_ERR(ns->file);  in nvmet_file_ns_enable()
45 			ns->device_path, ret);  in nvmet_file_ns_enable()
46 		ns->file = NULL;  in nvmet_file_ns_enable()
50 	nvmet_file_ns_revalidate(ns);  in nvmet_file_ns_enable()
56 	ns->blksize_shift = min_t(u8,  in nvmet_file_ns_enable()
57 			file_inode(ns->file)->i_blkbits, 12);  in nvmet_file_ns_enable()
59 	ns->bvec_pool = mempool_create(NVMET_MIN_MPOOL_OBJ, mempool_alloc_slab,  in nvmet_file_ns_enable()
62 	if (!ns->bvec_pool) {  in nvmet_file_ns_enable()
63 		ret = -ENOMEM;  in nvmet_file_ns_enable()
69 	fput(ns->file);  in nvmet_file_ns_enable()
70 	ns->file = NULL;  in nvmet_file_ns_enable()
71 	ns->size = 0;  in nvmet_file_ns_enable()
72 	ns->blksize_shift = 0;  in nvmet_file_ns_enable()
79 	struct kiocb *iocb = &req->f.iocb;  in nvmet_file_submit_bvec()
84 	if (req->cmd->rw.opcode == nvme_cmd_write) {  in nvmet_file_submit_bvec()
85 		if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))  in nvmet_file_submit_bvec()
87 		call_iter = req->ns->file->f_op->write_iter;  in nvmet_file_submit_bvec()
90 		call_iter = req->ns->file->f_op->read_iter;  in nvmet_file_submit_bvec()
94 	iov_iter_bvec(&iter, rw, req->f.bvec, nr_segs, count);  in nvmet_file_submit_bvec()
96 	iocb->ki_pos = pos;  in nvmet_file_submit_bvec()
97 	iocb->ki_filp = req->ns->file;  in nvmet_file_submit_bvec()
98 	iocb->ki_flags = ki_flags | iocb->ki_filp->f_iocb_flags;  in nvmet_file_submit_bvec()
108 	if (req->f.bvec != req->inline_bvec) {  in nvmet_file_io_done()
109 		if (likely(req->f.mpool_alloc == false))  in nvmet_file_io_done()
110 			kfree(req->f.bvec);  in nvmet_file_io_done()
112 			mempool_free(req->f.bvec, req->ns->bvec_pool);  in nvmet_file_io_done()
115 	if (unlikely(ret != req->transfer_len))  in nvmet_file_io_done()
122 	ssize_t nr_bvec = req->sg_cnt;  in nvmet_file_execute_io()
131 	if (req->f.mpool_alloc && nr_bvec > NVMET_MAX_MPOOL_BVEC)  in nvmet_file_execute_io()
134 	pos = le64_to_cpu(req->cmd->rw.slba) << req->ns->blksize_shift;  in nvmet_file_execute_io()
135 	if (unlikely(pos + req->transfer_len > req->ns->size)) {  in nvmet_file_execute_io()
136 		nvmet_req_complete(req, errno_to_nvme_status(req, -ENOSPC));  in nvmet_file_execute_io()
140 	memset(&req->f.iocb, 0, sizeof(struct kiocb));  in nvmet_file_execute_io()
141 	for_each_sg(req->sg, sg, req->sg_cnt, i) {  in nvmet_file_execute_io()
142 		bvec_set_page(&req->f.bvec[bv_cnt], sg_page(sg), sg->length,  in nvmet_file_execute_io()
143 			      sg->offset);  in nvmet_file_execute_io()
144 		len += req->f.bvec[bv_cnt].bv_len;  in nvmet_file_execute_io()
145 		total_len += req->f.bvec[bv_cnt].bv_len;  in nvmet_file_execute_io()
148 		WARN_ON_ONCE((nr_bvec - 1) < 0);  in nvmet_file_execute_io()
151 		    (nr_bvec - 1 == 0 || bv_cnt == NVMET_MAX_MPOOL_BVEC)) {  in nvmet_file_execute_io()
160 		nr_bvec--;  in nvmet_file_execute_io()
163 	if (WARN_ON_ONCE(total_len != req->transfer_len)) {  in nvmet_file_execute_io()
164 		ret = -EIO;  in nvmet_file_execute_io()
178 		req->f.iocb.ki_complete = nvmet_file_io_done;  in nvmet_file_execute_io()
183 	case -EIOCBQUEUED:  in nvmet_file_execute_io()
185 	case -EAGAIN:  in nvmet_file_execute_io()
189 	case -EOPNOTSUPP:  in nvmet_file_execute_io()
191 		 * For file systems returning error -EOPNOTSUPP, handle  in nvmet_file_execute_io()
201 	nvmet_file_io_done(&req->f.iocb, ret);  in nvmet_file_execute_io()
214 	INIT_WORK(&req->f.work, nvmet_file_buffered_io_work);  in nvmet_file_submit_buffered_io()
215 	queue_work(buffered_io_wq, &req->f.work);  in nvmet_file_submit_buffered_io()
220 	ssize_t nr_bvec = req->sg_cnt;  in nvmet_file_execute_rw()
225 	if (!req->sg_cnt || !nr_bvec) {  in nvmet_file_execute_rw()
231 		req->f.bvec = kmalloc_array(nr_bvec, sizeof(struct bio_vec),  in nvmet_file_execute_rw()
234 		req->f.bvec = req->inline_bvec;  in nvmet_file_execute_rw()
236 	if (unlikely(!req->f.bvec)) {  in nvmet_file_execute_rw()
238 		req->f.bvec = mempool_alloc(req->ns->bvec_pool, GFP_KERNEL);  in nvmet_file_execute_rw()
239 		req->f.mpool_alloc = true;  in nvmet_file_execute_rw()
241 		req->f.mpool_alloc = false;  in nvmet_file_execute_rw()
243 	if (req->ns->buffered_io) {  in nvmet_file_execute_rw()
244 		if (likely(!req->f.mpool_alloc) &&  in nvmet_file_execute_rw()
245 		    (req->ns->file->f_mode & FMODE_NOWAIT) &&  in nvmet_file_execute_rw()
255 	return errno_to_nvme_status(req, vfs_fsync(req->ns->file, 1));  in nvmet_file_flush()
269 	INIT_WORK(&req->f.work, nvmet_file_flush_work);  in nvmet_file_execute_flush()
270 	queue_work(nvmet_wq, &req->f.work);  in nvmet_file_execute_flush()
282 	for (i = 0; i <= le32_to_cpu(req->cmd->dsm.nr); i++) {  in nvmet_file_execute_discard()
288 		offset = le64_to_cpu(range.slba) << req->ns->blksize_shift;  in nvmet_file_execute_discard()
290 		len <<= req->ns->blksize_shift;  in nvmet_file_execute_discard()
291 		if (offset + len > req->ns->size) {  in nvmet_file_execute_discard()
292 			req->error_slba = le64_to_cpu(range.slba);  in nvmet_file_execute_discard()
293 			status = errno_to_nvme_status(req, -ENOSPC);  in nvmet_file_execute_discard()
297 		ret = vfs_fallocate(req->ns->file, mode, offset, len);  in nvmet_file_execute_discard()
298 		if (ret && ret != -EOPNOTSUPP) {  in nvmet_file_execute_discard()
299 			req->error_slba = le64_to_cpu(range.slba);  in nvmet_file_execute_discard()
312 	switch (le32_to_cpu(req->cmd->dsm.attributes)) {  in nvmet_file_dsm_work()
329 	INIT_WORK(&req->f.work, nvmet_file_dsm_work);  in nvmet_file_execute_dsm()
330 	queue_work(nvmet_wq, &req->f.work);  in nvmet_file_execute_dsm()
336 	struct nvme_write_zeroes_cmd *write_zeroes = &req->cmd->write_zeroes;  in nvmet_file_write_zeroes_work()
342 	offset = le64_to_cpu(write_zeroes->slba) << req->ns->blksize_shift;  in nvmet_file_write_zeroes_work()
343 	len = (((sector_t)le16_to_cpu(write_zeroes->length) + 1) <<  in nvmet_file_write_zeroes_work()
344 			req->ns->blksize_shift);  in nvmet_file_write_zeroes_work()
346 	if (unlikely(offset + len > req->ns->size)) {  in nvmet_file_write_zeroes_work()
347 		nvmet_req_complete(req, errno_to_nvme_status(req, -ENOSPC));  in nvmet_file_write_zeroes_work()
351 	ret = vfs_fallocate(req->ns->file, mode, offset, len);  in nvmet_file_write_zeroes_work()
359 	INIT_WORK(&req->f.work, nvmet_file_write_zeroes_work);  in nvmet_file_execute_write_zeroes()
360 	queue_work(nvmet_wq, &req->f.work);  in nvmet_file_execute_write_zeroes()
365 	switch (req->cmd->common.opcode) {  in nvmet_file_parse_io_cmd()
368 		req->execute = nvmet_file_execute_rw;  in nvmet_file_parse_io_cmd()
371 		req->execute = nvmet_file_execute_flush;  in nvmet_file_parse_io_cmd()
374 		req->execute = nvmet_file_execute_dsm;  in nvmet_file_parse_io_cmd()
377 		req->execute = nvmet_file_execute_write_zeroes;  in nvmet_file_parse_io_cmd()