11a59d1b8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
2c66ac9dbSNicholas Bellinger /*******************************************************************************
3c66ac9dbSNicholas Bellinger * Filename: target_core_file.c
4c66ac9dbSNicholas Bellinger *
5c66ac9dbSNicholas Bellinger * This file contains the Storage Engine <-> FILEIO transport specific functions
6c66ac9dbSNicholas Bellinger *
74c76251eSNicholas Bellinger * (c) Copyright 2005-2013 Datera, Inc.
8c66ac9dbSNicholas Bellinger *
9c66ac9dbSNicholas Bellinger * Nicholas A. Bellinger <nab@kernel.org>
10c66ac9dbSNicholas Bellinger *
11c66ac9dbSNicholas Bellinger ******************************************************************************/
12c66ac9dbSNicholas Bellinger
13c66ac9dbSNicholas Bellinger #include <linux/string.h>
14c66ac9dbSNicholas Bellinger #include <linux/parser.h>
15c66ac9dbSNicholas Bellinger #include <linux/timer.h>
16c66ac9dbSNicholas Bellinger #include <linux/blkdev.h>
17c66ac9dbSNicholas Bellinger #include <linux/slab.h>
18c66ac9dbSNicholas Bellinger #include <linux/spinlock.h>
19827509e3SPaul Gortmaker #include <linux/module.h>
205538d294SDavid S. Miller #include <linux/vmalloc.h>
2170d3ae5cSAsias He #include <linux/falloc.h>
228dcf07beSBart Van Assche #include <linux/uio.h>
2324b83debSChristoph Hellwig #include <linux/scatterlist.h>
24ba929992SBart Van Assche #include <scsi/scsi_proto.h>
2550642762SAsias He #include <asm/unaligned.h>
26c66ac9dbSNicholas Bellinger
27c66ac9dbSNicholas Bellinger #include <target/target_core_base.h>
28c4795fb2SChristoph Hellwig #include <target/target_core_backend.h>
29c66ac9dbSNicholas Bellinger
30c66ac9dbSNicholas Bellinger #include "target_core_file.h"
31c66ac9dbSNicholas Bellinger
FD_DEV(struct se_device * dev)320fd97ccfSChristoph Hellwig static inline struct fd_dev *FD_DEV(struct se_device *dev)
330fd97ccfSChristoph Hellwig {
340fd97ccfSChristoph Hellwig return container_of(dev, struct fd_dev, dev);
350fd97ccfSChristoph Hellwig }
36c66ac9dbSNicholas Bellinger
fd_attach_hba(struct se_hba * hba,u32 host_id)37c66ac9dbSNicholas Bellinger static int fd_attach_hba(struct se_hba *hba, u32 host_id)
38c66ac9dbSNicholas Bellinger {
39c66ac9dbSNicholas Bellinger struct fd_host *fd_host;
40c66ac9dbSNicholas Bellinger
41c66ac9dbSNicholas Bellinger fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL);
426708bb27SAndy Grover if (!fd_host) {
436708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_host\n");
44e3d6f909SAndy Grover return -ENOMEM;
45c66ac9dbSNicholas Bellinger }
46c66ac9dbSNicholas Bellinger
47c66ac9dbSNicholas Bellinger fd_host->fd_host_id = host_id;
48c66ac9dbSNicholas Bellinger
49e3d6f909SAndy Grover hba->hba_ptr = fd_host;
50c66ac9dbSNicholas Bellinger
516708bb27SAndy Grover pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic"
52c66ac9dbSNicholas Bellinger " Target Core Stack %s\n", hba->hba_id, FD_VERSION,
53ce8dd25dSChristoph Hellwig TARGET_CORE_VERSION);
5495cadaceSNicholas Bellinger pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic\n",
5595cadaceSNicholas Bellinger hba->hba_id, fd_host->fd_host_id);
56c66ac9dbSNicholas Bellinger
57c66ac9dbSNicholas Bellinger return 0;
58c66ac9dbSNicholas Bellinger }
59c66ac9dbSNicholas Bellinger
fd_detach_hba(struct se_hba * hba)60c66ac9dbSNicholas Bellinger static void fd_detach_hba(struct se_hba *hba)
61c66ac9dbSNicholas Bellinger {
62c66ac9dbSNicholas Bellinger struct fd_host *fd_host = hba->hba_ptr;
63c66ac9dbSNicholas Bellinger
646708bb27SAndy Grover pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic"
65c66ac9dbSNicholas Bellinger " Target Core\n", hba->hba_id, fd_host->fd_host_id);
66c66ac9dbSNicholas Bellinger
67c66ac9dbSNicholas Bellinger kfree(fd_host);
68c66ac9dbSNicholas Bellinger hba->hba_ptr = NULL;
69c66ac9dbSNicholas Bellinger }
70c66ac9dbSNicholas Bellinger
fd_alloc_device(struct se_hba * hba,const char * name)710fd97ccfSChristoph Hellwig static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name)
72c66ac9dbSNicholas Bellinger {
73c66ac9dbSNicholas Bellinger struct fd_dev *fd_dev;
748359cf43SJörn Engel struct fd_host *fd_host = hba->hba_ptr;
75c66ac9dbSNicholas Bellinger
76c66ac9dbSNicholas Bellinger fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL);
776708bb27SAndy Grover if (!fd_dev) {
786708bb27SAndy Grover pr_err("Unable to allocate memory for struct fd_dev\n");
79c66ac9dbSNicholas Bellinger return NULL;
80c66ac9dbSNicholas Bellinger }
81c66ac9dbSNicholas Bellinger
82c66ac9dbSNicholas Bellinger fd_dev->fd_host = fd_host;
83c66ac9dbSNicholas Bellinger
846708bb27SAndy Grover pr_debug("FILEIO: Allocated fd_dev for %p\n", name);
85c66ac9dbSNicholas Bellinger
860fd97ccfSChristoph Hellwig return &fd_dev->dev;
87c66ac9dbSNicholas Bellinger }
88c66ac9dbSNicholas Bellinger
fd_configure_unmap(struct se_device * dev)8933efaaf6SMike Christie static bool fd_configure_unmap(struct se_device *dev)
9033efaaf6SMike Christie {
9133efaaf6SMike Christie struct file *file = FD_DEV(dev)->fd_file;
9233efaaf6SMike Christie struct inode *inode = file->f_mapping->host;
9333efaaf6SMike Christie
9433efaaf6SMike Christie if (S_ISBLK(inode->i_mode))
9533efaaf6SMike Christie return target_configure_unmap_from_queue(&dev->dev_attrib,
9633efaaf6SMike Christie I_BDEV(inode));
9733efaaf6SMike Christie
9833efaaf6SMike Christie /* Limit UNMAP emulation to 8k Number of LBAs (NoLB) */
9933efaaf6SMike Christie dev->dev_attrib.max_unmap_lba_count = 0x2000;
10033efaaf6SMike Christie /* Currently hardcoded to 1 in Linux/SCSI code. */
10133efaaf6SMike Christie dev->dev_attrib.max_unmap_block_desc_count = 1;
10233efaaf6SMike Christie dev->dev_attrib.unmap_granularity = 1;
10333efaaf6SMike Christie dev->dev_attrib.unmap_granularity_alignment = 0;
10433efaaf6SMike Christie return true;
10533efaaf6SMike Christie }
10633efaaf6SMike Christie
fd_configure_device(struct se_device * dev)1070fd97ccfSChristoph Hellwig static int fd_configure_device(struct se_device *dev)
108c66ac9dbSNicholas Bellinger {
1090fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev);
1100fd97ccfSChristoph Hellwig struct fd_host *fd_host = dev->se_hba->hba_ptr;
111c66ac9dbSNicholas Bellinger struct file *file;
112c66ac9dbSNicholas Bellinger struct inode *inode = NULL;
1130fd97ccfSChristoph Hellwig int flags, ret = -EINVAL;
114c66ac9dbSNicholas Bellinger
1150fd97ccfSChristoph Hellwig if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) {
1160fd97ccfSChristoph Hellwig pr_err("Missing fd_dev_name=\n");
1170fd97ccfSChristoph Hellwig return -EINVAL;
1180fd97ccfSChristoph Hellwig }
119c66ac9dbSNicholas Bellinger
120c66ac9dbSNicholas Bellinger /*
121a4dff304SNicholas Bellinger * Use O_DSYNC by default instead of O_SYNC to forgo syncing
122a4dff304SNicholas Bellinger * of pure timestamp updates.
123c66ac9dbSNicholas Bellinger */
124a4dff304SNicholas Bellinger flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
1250fd97ccfSChristoph Hellwig
126b32f4c7eSNicholas Bellinger /*
127b32f4c7eSNicholas Bellinger * Optionally allow fd_buffered_io=1 to be enabled for people
128b32f4c7eSNicholas Bellinger * who want use the fs buffer cache as an WriteCache mechanism.
129b32f4c7eSNicholas Bellinger *
130b32f4c7eSNicholas Bellinger * This means that in event of a hard failure, there is a risk
131b32f4c7eSNicholas Bellinger * of silent data-loss if the SCSI client has *not* performed a
132b32f4c7eSNicholas Bellinger * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE
133b32f4c7eSNicholas Bellinger * to write-out the entire device cache.
134b32f4c7eSNicholas Bellinger */
135b32f4c7eSNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
136b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n");
137b32f4c7eSNicholas Bellinger flags &= ~O_DSYNC;
138b32f4c7eSNicholas Bellinger }
139c66ac9dbSNicholas Bellinger
140dbc6e022SAl Viro file = filp_open(fd_dev->fd_dev_name, flags, 0600);
141613640e4SNicholas Bellinger if (IS_ERR(file)) {
142dbc6e022SAl Viro pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name);
143613640e4SNicholas Bellinger ret = PTR_ERR(file);
144613640e4SNicholas Bellinger goto fail;
145613640e4SNicholas Bellinger }
146c66ac9dbSNicholas Bellinger fd_dev->fd_file = file;
147c66ac9dbSNicholas Bellinger /*
148c66ac9dbSNicholas Bellinger * If using a block backend with this struct file, we extract
149c66ac9dbSNicholas Bellinger * fd_dev->fd_[block,dev]_size from struct block_device.
150c66ac9dbSNicholas Bellinger *
151c66ac9dbSNicholas Bellinger * Otherwise, we use the passed fd_size= from configfs
152c66ac9dbSNicholas Bellinger */
153c66ac9dbSNicholas Bellinger inode = file->f_mapping->host;
154c66ac9dbSNicholas Bellinger if (S_ISBLK(inode->i_mode)) {
155817e8b51SChristoph Hellwig struct block_device *bdev = I_BDEV(inode);
156cd9323fdSNicholas Bellinger unsigned long long dev_size;
1570fd97ccfSChristoph Hellwig
158817e8b51SChristoph Hellwig fd_dev->fd_block_size = bdev_logical_block_size(bdev);
159c66ac9dbSNicholas Bellinger /*
160c66ac9dbSNicholas Bellinger * Determine the number of bytes from i_size_read() minus
161c66ac9dbSNicholas Bellinger * one (1) logical sector from underlying struct block_device
162c66ac9dbSNicholas Bellinger */
163cd9323fdSNicholas Bellinger dev_size = (i_size_read(file->f_mapping->host) -
164c66ac9dbSNicholas Bellinger fd_dev->fd_block_size);
165c66ac9dbSNicholas Bellinger
1666708bb27SAndy Grover pr_debug("FILEIO: Using size: %llu bytes from struct"
167c66ac9dbSNicholas Bellinger " block_device blocks: %llu logical_block_size: %d\n",
168cd9323fdSNicholas Bellinger dev_size, div_u64(dev_size, fd_dev->fd_block_size),
169c66ac9dbSNicholas Bellinger fd_dev->fd_block_size);
17070d3ae5cSAsias He /*
17170d3ae5cSAsias He * Enable write same emulation for IBLOCK and use 0xFFFF as
17270d3ae5cSAsias He * the smaller WRITE_SAME(10) only has a two-byte block count.
17370d3ae5cSAsias He */
17470d3ae5cSAsias He dev->dev_attrib.max_write_same_len = 0xFFFF;
1750463a3feSAsias He
17610f0d2a5SChristoph Hellwig if (bdev_nonrot(bdev))
1770463a3feSAsias He dev->dev_attrib.is_nonrot = 1;
178c66ac9dbSNicholas Bellinger } else {
179c66ac9dbSNicholas Bellinger if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
1806708bb27SAndy Grover pr_err("FILEIO: Missing fd_dev_size="
181c66ac9dbSNicholas Bellinger " parameter, and no backing struct"
182c66ac9dbSNicholas Bellinger " block_device\n");
183c66ac9dbSNicholas Bellinger goto fail;
184c66ac9dbSNicholas Bellinger }
185c66ac9dbSNicholas Bellinger
18621363ca8SNicholas Bellinger fd_dev->fd_block_size = FD_BLOCKSIZE;
18770d3ae5cSAsias He
18870d3ae5cSAsias He /*
18970d3ae5cSAsias He * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB)
19070d3ae5cSAsias He * based upon struct iovec limit for vfs_writev()
19170d3ae5cSAsias He */
19270d3ae5cSAsias He dev->dev_attrib.max_write_same_len = 0x1000;
193c66ac9dbSNicholas Bellinger }
194c66ac9dbSNicholas Bellinger
19521363ca8SNicholas Bellinger dev->dev_attrib.hw_block_size = fd_dev->fd_block_size;
19695cadaceSNicholas Bellinger dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_block_size;
1970fd97ccfSChristoph Hellwig dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
198c66ac9dbSNicholas Bellinger
199b32f4c7eSNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
200b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Forcing setting of emulate_write_cache=1"
201b32f4c7eSNicholas Bellinger " with FDBD_HAS_BUFFERED_IO_WCE\n");
2020fd97ccfSChristoph Hellwig dev->dev_attrib.emulate_write_cache = 1;
203b32f4c7eSNicholas Bellinger }
204b32f4c7eSNicholas Bellinger
205c66ac9dbSNicholas Bellinger fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
206c66ac9dbSNicholas Bellinger fd_dev->fd_queue_depth = dev->queue_depth;
207c66ac9dbSNicholas Bellinger
2086708bb27SAndy Grover pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s,"
209c66ac9dbSNicholas Bellinger " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id,
210c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size);
211c66ac9dbSNicholas Bellinger
2120fd97ccfSChristoph Hellwig return 0;
213c66ac9dbSNicholas Bellinger fail:
214c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) {
215c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL);
216c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL;
217c66ac9dbSNicholas Bellinger }
2180fd97ccfSChristoph Hellwig return ret;
219c66ac9dbSNicholas Bellinger }
220c66ac9dbSNicholas Bellinger
fd_dev_call_rcu(struct rcu_head * p)2214cc987eaSNicholas Bellinger static void fd_dev_call_rcu(struct rcu_head *p)
2224cc987eaSNicholas Bellinger {
2234cc987eaSNicholas Bellinger struct se_device *dev = container_of(p, struct se_device, rcu_head);
2244cc987eaSNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev);
2254cc987eaSNicholas Bellinger
2264cc987eaSNicholas Bellinger kfree(fd_dev);
2274cc987eaSNicholas Bellinger }
2284cc987eaSNicholas Bellinger
fd_free_device(struct se_device * dev)2290fd97ccfSChristoph Hellwig static void fd_free_device(struct se_device *dev)
230c66ac9dbSNicholas Bellinger {
23192634706SMike Christie call_rcu(&dev->rcu_head, fd_dev_call_rcu);
23292634706SMike Christie }
23392634706SMike Christie
fd_destroy_device(struct se_device * dev)23492634706SMike Christie static void fd_destroy_device(struct se_device *dev)
23592634706SMike Christie {
2360fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev);
237c66ac9dbSNicholas Bellinger
238c66ac9dbSNicholas Bellinger if (fd_dev->fd_file) {
239c66ac9dbSNicholas Bellinger filp_close(fd_dev->fd_file, NULL);
240c66ac9dbSNicholas Bellinger fd_dev->fd_file = NULL;
241c66ac9dbSNicholas Bellinger }
242c66ac9dbSNicholas Bellinger }
243c66ac9dbSNicholas Bellinger
244769031c9SAndrei Vagin struct target_core_file_cmd {
245769031c9SAndrei Vagin unsigned long len;
246769031c9SAndrei Vagin struct se_cmd *cmd;
247769031c9SAndrei Vagin struct kiocb iocb;
248ecd7fba0SChristoph Hellwig struct bio_vec bvecs[];
249769031c9SAndrei Vagin };
250769031c9SAndrei Vagin
cmd_rw_aio_complete(struct kiocb * iocb,long ret)2516b19b766SJens Axboe static void cmd_rw_aio_complete(struct kiocb *iocb, long ret)
252769031c9SAndrei Vagin {
253769031c9SAndrei Vagin struct target_core_file_cmd *cmd;
254769031c9SAndrei Vagin
255769031c9SAndrei Vagin cmd = container_of(iocb, struct target_core_file_cmd, iocb);
256769031c9SAndrei Vagin
257769031c9SAndrei Vagin if (ret != cmd->len)
258769031c9SAndrei Vagin target_complete_cmd(cmd->cmd, SAM_STAT_CHECK_CONDITION);
259769031c9SAndrei Vagin else
260769031c9SAndrei Vagin target_complete_cmd(cmd->cmd, SAM_STAT_GOOD);
261769031c9SAndrei Vagin
262769031c9SAndrei Vagin kfree(cmd);
263769031c9SAndrei Vagin }
264769031c9SAndrei Vagin
265769031c9SAndrei Vagin static sense_reason_t
fd_execute_rw_aio(struct se_cmd * cmd,struct scatterlist * sgl,u32 sgl_nents,enum dma_data_direction data_direction)266769031c9SAndrei Vagin fd_execute_rw_aio(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
267769031c9SAndrei Vagin enum dma_data_direction data_direction)
268769031c9SAndrei Vagin {
269769031c9SAndrei Vagin int is_write = !(data_direction == DMA_FROM_DEVICE);
270769031c9SAndrei Vagin struct se_device *dev = cmd->se_dev;
271769031c9SAndrei Vagin struct fd_dev *fd_dev = FD_DEV(dev);
272769031c9SAndrei Vagin struct file *file = fd_dev->fd_file;
273769031c9SAndrei Vagin struct target_core_file_cmd *aio_cmd;
2746b1dba3dSPavel Begunkov struct iov_iter iter;
275769031c9SAndrei Vagin struct scatterlist *sg;
276769031c9SAndrei Vagin ssize_t len = 0;
277769031c9SAndrei Vagin int ret = 0, i;
278769031c9SAndrei Vagin
279ecd7fba0SChristoph Hellwig aio_cmd = kmalloc(struct_size(aio_cmd, bvecs, sgl_nents), GFP_KERNEL);
280769031c9SAndrei Vagin if (!aio_cmd)
281769031c9SAndrei Vagin return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
282769031c9SAndrei Vagin
283769031c9SAndrei Vagin for_each_sg(sgl, sg, sgl_nents, i) {
2843c7ebe95SChristoph Hellwig bvec_set_page(&aio_cmd->bvecs[i], sg_page(sg), sg->length,
2853c7ebe95SChristoph Hellwig sg->offset);
286769031c9SAndrei Vagin len += sg->length;
287769031c9SAndrei Vagin }
288769031c9SAndrei Vagin
289ecd7fba0SChristoph Hellwig iov_iter_bvec(&iter, is_write, aio_cmd->bvecs, sgl_nents, len);
290769031c9SAndrei Vagin
291769031c9SAndrei Vagin aio_cmd->cmd = cmd;
292769031c9SAndrei Vagin aio_cmd->len = len;
293769031c9SAndrei Vagin aio_cmd->iocb.ki_pos = cmd->t_task_lba * dev->dev_attrib.block_size;
294769031c9SAndrei Vagin aio_cmd->iocb.ki_filp = file;
295769031c9SAndrei Vagin aio_cmd->iocb.ki_complete = cmd_rw_aio_complete;
296769031c9SAndrei Vagin aio_cmd->iocb.ki_flags = IOCB_DIRECT;
297769031c9SAndrei Vagin
298769031c9SAndrei Vagin if (is_write && (cmd->se_cmd_flags & SCF_FUA))
299769031c9SAndrei Vagin aio_cmd->iocb.ki_flags |= IOCB_DSYNC;
300769031c9SAndrei Vagin
301769031c9SAndrei Vagin if (is_write)
302769031c9SAndrei Vagin ret = call_write_iter(file, &aio_cmd->iocb, &iter);
303769031c9SAndrei Vagin else
304769031c9SAndrei Vagin ret = call_read_iter(file, &aio_cmd->iocb, &iter);
305769031c9SAndrei Vagin
306769031c9SAndrei Vagin if (ret != -EIOCBQUEUED)
3076b19b766SJens Axboe cmd_rw_aio_complete(&aio_cmd->iocb, ret);
308769031c9SAndrei Vagin
309769031c9SAndrei Vagin return 0;
310769031c9SAndrei Vagin }
311769031c9SAndrei Vagin
fd_do_rw(struct se_cmd * cmd,struct file * fd,u32 block_size,struct scatterlist * sgl,u32 sgl_nents,u32 data_length,int is_write)3128287fa5fSSagi Grimberg static int fd_do_rw(struct se_cmd *cmd, struct file *fd,
3138287fa5fSSagi Grimberg u32 block_size, struct scatterlist *sgl,
3148287fa5fSSagi Grimberg u32 sgl_nents, u32 data_length, int is_write)
31542201b55SNicholas Bellinger {
3165787cacdSChristoph Hellwig struct scatterlist *sg;
3176b9a44d0SChristoph Hellwig struct iov_iter iter;
3186b9a44d0SChristoph Hellwig struct bio_vec *bvec;
3196b9a44d0SChristoph Hellwig ssize_t len = 0;
3208287fa5fSSagi Grimberg loff_t pos = (cmd->t_task_lba * block_size);
321c66ac9dbSNicholas Bellinger int ret = 0, i;
322c66ac9dbSNicholas Bellinger
3236b9a44d0SChristoph Hellwig bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL);
3246b9a44d0SChristoph Hellwig if (!bvec) {
3256708bb27SAndy Grover pr_err("Unable to allocate fd_do_readv iov[]\n");
326e3d6f909SAndy Grover return -ENOMEM;
327c66ac9dbSNicholas Bellinger }
328c66ac9dbSNicholas Bellinger
3295787cacdSChristoph Hellwig for_each_sg(sgl, sg, sgl_nents, i) {
3303c7ebe95SChristoph Hellwig bvec_set_page(&bvec[i], sg_page(sg), sg->length, sg->offset);
3316b9a44d0SChristoph Hellwig len += sg->length;
332c66ac9dbSNicholas Bellinger }
333c66ac9dbSNicholas Bellinger
334b676668dSAl Viro iov_iter_bvec(&iter, is_write, bvec, sgl_nents, len);
335*ca8e1a5dSAmir Goldstein if (is_write) {
336*ca8e1a5dSAmir Goldstein file_start_write(fd);
337abbb6589SChristoph Hellwig ret = vfs_iter_write(fd, &iter, &pos, 0);
338*ca8e1a5dSAmir Goldstein file_end_write(fd);
339*ca8e1a5dSAmir Goldstein } else {
34018e9710eSChristoph Hellwig ret = vfs_iter_read(fd, &iter, &pos, 0);
341*ca8e1a5dSAmir Goldstein }
342778229afSSebastian Andrzej Siewior if (is_write) {
3438287fa5fSSagi Grimberg if (ret < 0 || ret != data_length) {
344778229afSSebastian Andrzej Siewior pr_err("%s() write returned %d\n", __func__, ret);
345f11b55d1SDmitry Monakhov if (ret >= 0)
346f11b55d1SDmitry Monakhov ret = -EINVAL;
347778229afSSebastian Andrzej Siewior }
348778229afSSebastian Andrzej Siewior } else {
349c66ac9dbSNicholas Bellinger /*
350c66ac9dbSNicholas Bellinger * Return zeros and GOOD status even if the READ did not return
351c66ac9dbSNicholas Bellinger * the expected virt_size for struct file w/o a backing struct
352c66ac9dbSNicholas Bellinger * block_device.
353c66ac9dbSNicholas Bellinger */
354496ad9aaSAl Viro if (S_ISBLK(file_inode(fd)->i_mode)) {
3558287fa5fSSagi Grimberg if (ret < 0 || ret != data_length) {
356778229afSSebastian Andrzej Siewior pr_err("%s() returned %d, expecting %u for "
357778229afSSebastian Andrzej Siewior "S_ISBLK\n", __func__, ret,
3588287fa5fSSagi Grimberg data_length);
359f11b55d1SDmitry Monakhov if (ret >= 0)
360f11b55d1SDmitry Monakhov ret = -EINVAL;
361c66ac9dbSNicholas Bellinger }
362c66ac9dbSNicholas Bellinger } else {
363c66ac9dbSNicholas Bellinger if (ret < 0) {
364778229afSSebastian Andrzej Siewior pr_err("%s() returned %d for non S_ISBLK\n",
365778229afSSebastian Andrzej Siewior __func__, ret);
366f11b55d1SDmitry Monakhov } else if (ret != data_length) {
367f11b55d1SDmitry Monakhov /*
368f11b55d1SDmitry Monakhov * Short read case:
369f11b55d1SDmitry Monakhov * Probably some one truncate file under us.
370f11b55d1SDmitry Monakhov * We must explicitly zero sg-pages to prevent
371f11b55d1SDmitry Monakhov * expose uninizialized pages to userspace.
372f11b55d1SDmitry Monakhov */
373f11b55d1SDmitry Monakhov if (ret < data_length)
374f11b55d1SDmitry Monakhov ret += iov_iter_zero(data_length - ret, &iter);
375f11b55d1SDmitry Monakhov else
376f11b55d1SDmitry Monakhov ret = -EINVAL;
377f11b55d1SDmitry Monakhov }
378f11b55d1SDmitry Monakhov }
379f11b55d1SDmitry Monakhov }
380f11b55d1SDmitry Monakhov kfree(bvec);
381e3d6f909SAndy Grover return ret;
382c66ac9dbSNicholas Bellinger }
383c66ac9dbSNicholas Bellinger
384de103c93SChristoph Hellwig static sense_reason_t
fd_execute_sync_cache(struct se_cmd * cmd)385de103c93SChristoph Hellwig fd_execute_sync_cache(struct se_cmd *cmd)
386c66ac9dbSNicholas Bellinger {
387c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev;
3880fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev);
389a1d8b49aSAndy Grover int immed = (cmd->t_task_cdb[1] & 0x2);
390c66ac9dbSNicholas Bellinger loff_t start, end;
391c66ac9dbSNicholas Bellinger int ret;
392c66ac9dbSNicholas Bellinger
393c66ac9dbSNicholas Bellinger /*
394c66ac9dbSNicholas Bellinger * If the Immediate bit is set, queue up the GOOD response
395c66ac9dbSNicholas Bellinger * for this SYNCHRONIZE_CACHE op
396c66ac9dbSNicholas Bellinger */
397c66ac9dbSNicholas Bellinger if (immed)
3985787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD);
399c66ac9dbSNicholas Bellinger
400c66ac9dbSNicholas Bellinger /*
401c66ac9dbSNicholas Bellinger * Determine if we will be flushing the entire device.
402c66ac9dbSNicholas Bellinger */
403a1d8b49aSAndy Grover if (cmd->t_task_lba == 0 && cmd->data_length == 0) {
404c66ac9dbSNicholas Bellinger start = 0;
405c66ac9dbSNicholas Bellinger end = LLONG_MAX;
406c66ac9dbSNicholas Bellinger } else {
4070fd97ccfSChristoph Hellwig start = cmd->t_task_lba * dev->dev_attrib.block_size;
408c66ac9dbSNicholas Bellinger if (cmd->data_length)
40962d3ab49SZach Brown end = start + cmd->data_length - 1;
410c66ac9dbSNicholas Bellinger else
411c66ac9dbSNicholas Bellinger end = LLONG_MAX;
412c66ac9dbSNicholas Bellinger }
413c66ac9dbSNicholas Bellinger
414c66ac9dbSNicholas Bellinger ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
415c66ac9dbSNicholas Bellinger if (ret != 0)
4166708bb27SAndy Grover pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret);
417c66ac9dbSNicholas Bellinger
4185787cacdSChristoph Hellwig if (immed)
419ad67f0d9SChristoph Hellwig return 0;
4205787cacdSChristoph Hellwig
421de103c93SChristoph Hellwig if (ret)
4225787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
423de103c93SChristoph Hellwig else
4245787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD);
425ad67f0d9SChristoph Hellwig
426ad67f0d9SChristoph Hellwig return 0;
427c66ac9dbSNicholas Bellinger }
428c66ac9dbSNicholas Bellinger
4297b745c84SNicholas Bellinger static sense_reason_t
fd_execute_write_same(struct se_cmd * cmd)4307b745c84SNicholas Bellinger fd_execute_write_same(struct se_cmd *cmd)
4317b745c84SNicholas Bellinger {
4327b745c84SNicholas Bellinger struct se_device *se_dev = cmd->se_dev;
4337b745c84SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(se_dev);
4347b745c84SNicholas Bellinger loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size;
435d4c5dcacSChristoph Hellwig sector_t nolb = sbc_get_write_same_sectors(cmd);
436d4c5dcacSChristoph Hellwig struct iov_iter iter;
437d4c5dcacSChristoph Hellwig struct bio_vec *bvec;
438d4c5dcacSChristoph Hellwig unsigned int len = 0, i;
439d4c5dcacSChristoph Hellwig ssize_t ret;
4407b745c84SNicholas Bellinger
441afd73f1bSNicholas Bellinger if (cmd->prot_op) {
442afd73f1bSNicholas Bellinger pr_err("WRITE_SAME: Protection information with FILEIO"
443afd73f1bSNicholas Bellinger " backends not supported\n");
444afd73f1bSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
445afd73f1bSNicholas Bellinger }
4467b745c84SNicholas Bellinger
447ccd3f449SMike Christie if (!cmd->t_data_nents)
448ccd3f449SMike Christie return TCM_INVALID_CDB_FIELD;
449ccd3f449SMike Christie
4507b745c84SNicholas Bellinger if (cmd->t_data_nents > 1 ||
451d4c5dcacSChristoph Hellwig cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) {
4527b745c84SNicholas Bellinger pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
453d4c5dcacSChristoph Hellwig " block_size: %u\n",
454d4c5dcacSChristoph Hellwig cmd->t_data_nents,
455d4c5dcacSChristoph Hellwig cmd->t_data_sg[0].length,
4567b745c84SNicholas Bellinger cmd->se_dev->dev_attrib.block_size);
4577b745c84SNicholas Bellinger return TCM_INVALID_CDB_FIELD;
4587b745c84SNicholas Bellinger }
4597b745c84SNicholas Bellinger
460d4c5dcacSChristoph Hellwig bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL);
461d4c5dcacSChristoph Hellwig if (!bvec)
4627b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4637b745c84SNicholas Bellinger
464d4c5dcacSChristoph Hellwig for (i = 0; i < nolb; i++) {
4653c7ebe95SChristoph Hellwig bvec_set_page(&bvec[i], sg_page(&cmd->t_data_sg[0]),
4663c7ebe95SChristoph Hellwig cmd->t_data_sg[0].length,
4673c7ebe95SChristoph Hellwig cmd->t_data_sg[0].offset);
468d4c5dcacSChristoph Hellwig len += se_dev->dev_attrib.block_size;
4697b745c84SNicholas Bellinger }
4707b745c84SNicholas Bellinger
471de4eda9dSAl Viro iov_iter_bvec(&iter, ITER_SOURCE, bvec, nolb, len);
472*ca8e1a5dSAmir Goldstein file_start_write(fd_dev->fd_file);
473abbb6589SChristoph Hellwig ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos, 0);
474*ca8e1a5dSAmir Goldstein file_end_write(fd_dev->fd_file);
4757b745c84SNicholas Bellinger
476d4c5dcacSChristoph Hellwig kfree(bvec);
477d4c5dcacSChristoph Hellwig if (ret < 0 || ret != len) {
478d4c5dcacSChristoph Hellwig pr_err("vfs_iter_write() returned %zd for write same\n", ret);
4797b745c84SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4807b745c84SNicholas Bellinger }
4817b745c84SNicholas Bellinger
4827b745c84SNicholas Bellinger target_complete_cmd(cmd, SAM_STAT_GOOD);
4837b745c84SNicholas Bellinger return 0;
4847b745c84SNicholas Bellinger }
4857b745c84SNicholas Bellinger
48664d240b7SAkinobu Mita static int
fd_do_prot_fill(struct se_device * se_dev,sector_t lba,sector_t nolb,void * buf,size_t bufsize)48764d240b7SAkinobu Mita fd_do_prot_fill(struct se_device *se_dev, sector_t lba, sector_t nolb,
48864d240b7SAkinobu Mita void *buf, size_t bufsize)
48964d240b7SAkinobu Mita {
49064d240b7SAkinobu Mita struct fd_dev *fd_dev = FD_DEV(se_dev);
49164d240b7SAkinobu Mita struct file *prot_fd = fd_dev->fd_prot_file;
49264d240b7SAkinobu Mita sector_t prot_length, prot;
49364d240b7SAkinobu Mita loff_t pos = lba * se_dev->prot_length;
49464d240b7SAkinobu Mita
49564d240b7SAkinobu Mita if (!prot_fd) {
49664d240b7SAkinobu Mita pr_err("Unable to locate fd_dev->fd_prot_file\n");
49764d240b7SAkinobu Mita return -ENODEV;
49864d240b7SAkinobu Mita }
49964d240b7SAkinobu Mita
50064d240b7SAkinobu Mita prot_length = nolb * se_dev->prot_length;
50164d240b7SAkinobu Mita
5024524a0b1SChaitanya Kulkarni memset(buf, 0xff, bufsize);
50364d240b7SAkinobu Mita for (prot = 0; prot < prot_length;) {
50464d240b7SAkinobu Mita sector_t len = min_t(sector_t, bufsize, prot_length - prot);
505e13ec939SChristoph Hellwig ssize_t ret = kernel_write(prot_fd, buf, len, &pos);
50664d240b7SAkinobu Mita
50764d240b7SAkinobu Mita if (ret != len) {
50864d240b7SAkinobu Mita pr_err("vfs_write to prot file failed: %zd\n", ret);
50964d240b7SAkinobu Mita return ret < 0 ? ret : -ENODEV;
51064d240b7SAkinobu Mita }
51164d240b7SAkinobu Mita prot += ret;
51264d240b7SAkinobu Mita }
51364d240b7SAkinobu Mita
51464d240b7SAkinobu Mita return 0;
51564d240b7SAkinobu Mita }
51664d240b7SAkinobu Mita
51764d240b7SAkinobu Mita static int
fd_do_prot_unmap(struct se_cmd * cmd,sector_t lba,sector_t nolb)51864d240b7SAkinobu Mita fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
51964d240b7SAkinobu Mita {
52064d240b7SAkinobu Mita void *buf;
52164d240b7SAkinobu Mita int rc;
52264d240b7SAkinobu Mita
52364d240b7SAkinobu Mita buf = (void *)__get_free_page(GFP_KERNEL);
52464d240b7SAkinobu Mita if (!buf) {
52564d240b7SAkinobu Mita pr_err("Unable to allocate FILEIO prot buf\n");
52664d240b7SAkinobu Mita return -ENOMEM;
52764d240b7SAkinobu Mita }
52864d240b7SAkinobu Mita
52964d240b7SAkinobu Mita rc = fd_do_prot_fill(cmd->se_dev, lba, nolb, buf, PAGE_SIZE);
53064d240b7SAkinobu Mita
53164d240b7SAkinobu Mita free_page((unsigned long)buf);
53264d240b7SAkinobu Mita
53364d240b7SAkinobu Mita return rc;
53464d240b7SAkinobu Mita }
53564d240b7SAkinobu Mita
536de103c93SChristoph Hellwig static sense_reason_t
fd_execute_unmap(struct se_cmd * cmd,sector_t lba,sector_t nolb)53762e46942SChristoph Hellwig fd_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
53870d3ae5cSAsias He {
53962e46942SChristoph Hellwig struct file *file = FD_DEV(cmd->se_dev)->fd_file;
54070d3ae5cSAsias He struct inode *inode = file->f_mapping->host;
54170d3ae5cSAsias He int ret;
54270d3ae5cSAsias He
543594e25e7SJiang Yi if (!nolb) {
544594e25e7SJiang Yi return 0;
545594e25e7SJiang Yi }
546594e25e7SJiang Yi
54764d240b7SAkinobu Mita if (cmd->se_dev->dev_attrib.pi_prot_type) {
54864d240b7SAkinobu Mita ret = fd_do_prot_unmap(cmd, lba, nolb);
54964d240b7SAkinobu Mita if (ret)
55064d240b7SAkinobu Mita return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
55164d240b7SAkinobu Mita }
55264d240b7SAkinobu Mita
55370d3ae5cSAsias He if (S_ISBLK(inode->i_mode)) {
55470d3ae5cSAsias He /* The backend is block device, use discard */
5554e7b5671SChristoph Hellwig struct block_device *bdev = I_BDEV(inode);
5568a9ebe71SMike Christie struct se_device *dev = cmd->se_dev;
55770d3ae5cSAsias He
5588a9ebe71SMike Christie ret = blkdev_issue_discard(bdev,
5598a9ebe71SMike Christie target_to_linux_sector(dev, lba),
5608a9ebe71SMike Christie target_to_linux_sector(dev, nolb),
56144abff2cSChristoph Hellwig GFP_KERNEL);
56270d3ae5cSAsias He if (ret < 0) {
56370d3ae5cSAsias He pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n",
56470d3ae5cSAsias He ret);
56570d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
56670d3ae5cSAsias He }
56770d3ae5cSAsias He } else {
56870d3ae5cSAsias He /* The backend is normal file, use fallocate */
56943f55bbbSAsias He struct se_device *se_dev = cmd->se_dev;
57043f55bbbSAsias He loff_t pos = lba * se_dev->dev_attrib.block_size;
57170d3ae5cSAsias He unsigned int len = nolb * se_dev->dev_attrib.block_size;
57270d3ae5cSAsias He int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
57370d3ae5cSAsias He
57470d3ae5cSAsias He if (!file->f_op->fallocate)
57570d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
57670d3ae5cSAsias He
57770d3ae5cSAsias He ret = file->f_op->fallocate(file, mode, pos, len);
57870d3ae5cSAsias He if (ret < 0) {
57970d3ae5cSAsias He pr_warn("FILEIO: fallocate() failed: %d\n", ret);
58070d3ae5cSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
58170d3ae5cSAsias He }
58270d3ae5cSAsias He }
58370d3ae5cSAsias He
58443f55bbbSAsias He return 0;
58543f55bbbSAsias He }
58643f55bbbSAsias He
58743f55bbbSAsias He static sense_reason_t
fd_execute_rw_buffered(struct se_cmd * cmd,struct scatterlist * sgl,u32 sgl_nents,enum dma_data_direction data_direction)588769031c9SAndrei Vagin fd_execute_rw_buffered(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
589a82a9538SNicholas Bellinger enum dma_data_direction data_direction)
590c66ac9dbSNicholas Bellinger {
591c66ac9dbSNicholas Bellinger struct se_device *dev = cmd->se_dev;
5928287fa5fSSagi Grimberg struct fd_dev *fd_dev = FD_DEV(dev);
5938287fa5fSSagi Grimberg struct file *file = fd_dev->fd_file;
5948287fa5fSSagi Grimberg struct file *pfile = fd_dev->fd_prot_file;
59542201b55SNicholas Bellinger sense_reason_t rc;
596c66ac9dbSNicholas Bellinger int ret = 0;
597046ba642SNicholas Bellinger /*
598c66ac9dbSNicholas Bellinger * Call vectorized fileio functions to map struct scatterlist
599c66ac9dbSNicholas Bellinger * physical memory addresses to struct iovec virtual memory.
600c66ac9dbSNicholas Bellinger */
6015787cacdSChristoph Hellwig if (data_direction == DMA_FROM_DEVICE) {
602ee920469SNicholas Bellinger if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
6038287fa5fSSagi Grimberg ret = fd_do_rw(cmd, pfile, dev->prot_length,
6048287fa5fSSagi Grimberg cmd->t_prot_sg, cmd->t_prot_nents,
6058287fa5fSSagi Grimberg cmd->prot_length, 0);
60642201b55SNicholas Bellinger if (ret < 0)
60742201b55SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
60842201b55SNicholas Bellinger }
60942201b55SNicholas Bellinger
6108287fa5fSSagi Grimberg ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
6118287fa5fSSagi Grimberg sgl, sgl_nents, cmd->data_length, 0);
61242201b55SNicholas Bellinger
613056e8924SDmitry Monakhov if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type &&
614056e8924SDmitry Monakhov dev->dev_attrib.pi_prot_verify) {
6158287fa5fSSagi Grimberg u32 sectors = cmd->data_length >>
6168287fa5fSSagi Grimberg ilog2(dev->dev_attrib.block_size);
61742201b55SNicholas Bellinger
618f75b6faeSSagi Grimberg rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
619f75b6faeSSagi Grimberg 0, cmd->t_prot_sg, 0);
6208287fa5fSSagi Grimberg if (rc)
62142201b55SNicholas Bellinger return rc;
62242201b55SNicholas Bellinger }
623c66ac9dbSNicholas Bellinger } else {
624056e8924SDmitry Monakhov if (cmd->prot_type && dev->dev_attrib.pi_prot_type &&
625056e8924SDmitry Monakhov dev->dev_attrib.pi_prot_verify) {
6268287fa5fSSagi Grimberg u32 sectors = cmd->data_length >>
6278287fa5fSSagi Grimberg ilog2(dev->dev_attrib.block_size);
62842201b55SNicholas Bellinger
6298287fa5fSSagi Grimberg rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
6308287fa5fSSagi Grimberg 0, cmd->t_prot_sg, 0);
6318287fa5fSSagi Grimberg if (rc)
63242201b55SNicholas Bellinger return rc;
63342201b55SNicholas Bellinger }
63442201b55SNicholas Bellinger
6358287fa5fSSagi Grimberg ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
6368287fa5fSSagi Grimberg sgl, sgl_nents, cmd->data_length, 1);
637a4dff304SNicholas Bellinger /*
638125d0119SHannes Reinecke * Perform implicit vfs_fsync_range() for fd_do_writev() ops
639a4dff304SNicholas Bellinger * for SCSI WRITEs with Forced Unit Access (FUA) set.
640a4dff304SNicholas Bellinger * Allow this to happen independent of WCE=0 setting.
641a4dff304SNicholas Bellinger */
642814e5b45SChristoph Hellwig if (ret > 0 && (cmd->se_cmd_flags & SCF_FUA)) {
643a4dff304SNicholas Bellinger loff_t start = cmd->t_task_lba *
6440fd97ccfSChristoph Hellwig dev->dev_attrib.block_size;
64562d3ab49SZach Brown loff_t end;
64662d3ab49SZach Brown
64762d3ab49SZach Brown if (cmd->data_length)
64862d3ab49SZach Brown end = start + cmd->data_length - 1;
64962d3ab49SZach Brown else
65062d3ab49SZach Brown end = LLONG_MAX;
651c66ac9dbSNicholas Bellinger
652a4dff304SNicholas Bellinger vfs_fsync_range(fd_dev->fd_file, start, end, 1);
653a4dff304SNicholas Bellinger }
654c66ac9dbSNicholas Bellinger
655ee920469SNicholas Bellinger if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) {
6568287fa5fSSagi Grimberg ret = fd_do_rw(cmd, pfile, dev->prot_length,
6578287fa5fSSagi Grimberg cmd->t_prot_sg, cmd->t_prot_nents,
6588287fa5fSSagi Grimberg cmd->prot_length, 1);
659de103c93SChristoph Hellwig if (ret < 0)
660de103c93SChristoph Hellwig return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
66142201b55SNicholas Bellinger }
66242201b55SNicholas Bellinger }
66342201b55SNicholas Bellinger
6648287fa5fSSagi Grimberg if (ret < 0)
66542201b55SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
666de103c93SChristoph Hellwig
6675787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD);
66803e98c9eSNicholas Bellinger return 0;
669c66ac9dbSNicholas Bellinger }
670c66ac9dbSNicholas Bellinger
671769031c9SAndrei Vagin static sense_reason_t
fd_execute_rw(struct se_cmd * cmd,struct scatterlist * sgl,u32 sgl_nents,enum dma_data_direction data_direction)672769031c9SAndrei Vagin fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
673769031c9SAndrei Vagin enum dma_data_direction data_direction)
674769031c9SAndrei Vagin {
675769031c9SAndrei Vagin struct se_device *dev = cmd->se_dev;
676769031c9SAndrei Vagin struct fd_dev *fd_dev = FD_DEV(dev);
677769031c9SAndrei Vagin
678769031c9SAndrei Vagin /*
679769031c9SAndrei Vagin * We are currently limited by the number of iovecs (2048) per
680769031c9SAndrei Vagin * single vfs_[writev,readv] call.
681769031c9SAndrei Vagin */
682769031c9SAndrei Vagin if (cmd->data_length > FD_MAX_BYTES) {
683769031c9SAndrei Vagin pr_err("FILEIO: Not able to process I/O of %u bytes due to"
684769031c9SAndrei Vagin "FD_MAX_BYTES: %u iovec count limitation\n",
685769031c9SAndrei Vagin cmd->data_length, FD_MAX_BYTES);
686769031c9SAndrei Vagin return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
687769031c9SAndrei Vagin }
688769031c9SAndrei Vagin
689769031c9SAndrei Vagin if (fd_dev->fbd_flags & FDBD_HAS_ASYNC_IO)
690769031c9SAndrei Vagin return fd_execute_rw_aio(cmd, sgl, sgl_nents, data_direction);
691769031c9SAndrei Vagin return fd_execute_rw_buffered(cmd, sgl, sgl_nents, data_direction);
692769031c9SAndrei Vagin }
693769031c9SAndrei Vagin
694c66ac9dbSNicholas Bellinger enum {
695769031c9SAndrei Vagin Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io,
696769031c9SAndrei Vagin Opt_fd_async_io, Opt_err
697c66ac9dbSNicholas Bellinger };
698c66ac9dbSNicholas Bellinger
699c66ac9dbSNicholas Bellinger static match_table_t tokens = {
700c66ac9dbSNicholas Bellinger {Opt_fd_dev_name, "fd_dev_name=%s"},
701c66ac9dbSNicholas Bellinger {Opt_fd_dev_size, "fd_dev_size=%s"},
702b32f4c7eSNicholas Bellinger {Opt_fd_buffered_io, "fd_buffered_io=%d"},
703769031c9SAndrei Vagin {Opt_fd_async_io, "fd_async_io=%d"},
704c66ac9dbSNicholas Bellinger {Opt_err, NULL}
705c66ac9dbSNicholas Bellinger };
706c66ac9dbSNicholas Bellinger
fd_set_configfs_dev_params(struct se_device * dev,const char * page,ssize_t count)7070fd97ccfSChristoph Hellwig static ssize_t fd_set_configfs_dev_params(struct se_device *dev,
708c66ac9dbSNicholas Bellinger const char *page, ssize_t count)
709c66ac9dbSNicholas Bellinger {
7100fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev);
711c66ac9dbSNicholas Bellinger char *orig, *ptr, *arg_p, *opts;
712c66ac9dbSNicholas Bellinger substring_t args[MAX_OPT_ARGS];
713b32f4c7eSNicholas Bellinger int ret = 0, arg, token;
714c66ac9dbSNicholas Bellinger
715c66ac9dbSNicholas Bellinger opts = kstrdup(page, GFP_KERNEL);
716c66ac9dbSNicholas Bellinger if (!opts)
717c66ac9dbSNicholas Bellinger return -ENOMEM;
718c66ac9dbSNicholas Bellinger
719c66ac9dbSNicholas Bellinger orig = opts;
720c66ac9dbSNicholas Bellinger
72190c161b6SSebastian Andrzej Siewior while ((ptr = strsep(&opts, ",\n")) != NULL) {
722c66ac9dbSNicholas Bellinger if (!*ptr)
723c66ac9dbSNicholas Bellinger continue;
724c66ac9dbSNicholas Bellinger
725c66ac9dbSNicholas Bellinger token = match_token(ptr, tokens, args);
726c66ac9dbSNicholas Bellinger switch (token) {
727c66ac9dbSNicholas Bellinger case Opt_fd_dev_name:
728dbc6e022SAl Viro if (match_strlcpy(fd_dev->fd_dev_name, &args[0],
729dbc6e022SAl Viro FD_MAX_DEV_NAME) == 0) {
730dbc6e022SAl Viro ret = -EINVAL;
7316d180253SJesper Juhl break;
7326d180253SJesper Juhl }
7336708bb27SAndy Grover pr_debug("FILEIO: Referencing Path: %s\n",
734c66ac9dbSNicholas Bellinger fd_dev->fd_dev_name);
735c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_PATH;
736c66ac9dbSNicholas Bellinger break;
737c66ac9dbSNicholas Bellinger case Opt_fd_dev_size:
738c66ac9dbSNicholas Bellinger arg_p = match_strdup(&args[0]);
7396d180253SJesper Juhl if (!arg_p) {
7406d180253SJesper Juhl ret = -ENOMEM;
7416d180253SJesper Juhl break;
7426d180253SJesper Juhl }
74357103d7fSJingoo Han ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size);
7446d180253SJesper Juhl kfree(arg_p);
745c66ac9dbSNicholas Bellinger if (ret < 0) {
74657103d7fSJingoo Han pr_err("kstrtoull() failed for"
747c66ac9dbSNicholas Bellinger " fd_dev_size=\n");
748c66ac9dbSNicholas Bellinger goto out;
749c66ac9dbSNicholas Bellinger }
7506708bb27SAndy Grover pr_debug("FILEIO: Referencing Size: %llu"
751c66ac9dbSNicholas Bellinger " bytes\n", fd_dev->fd_dev_size);
752c66ac9dbSNicholas Bellinger fd_dev->fbd_flags |= FBDF_HAS_SIZE;
753c66ac9dbSNicholas Bellinger break;
754b32f4c7eSNicholas Bellinger case Opt_fd_buffered_io:
755ce31c1b0SJoern Engel ret = match_int(args, &arg);
756ce31c1b0SJoern Engel if (ret)
757ce31c1b0SJoern Engel goto out;
758b32f4c7eSNicholas Bellinger if (arg != 1) {
759b32f4c7eSNicholas Bellinger pr_err("bogus fd_buffered_io=%d value\n", arg);
760b32f4c7eSNicholas Bellinger ret = -EINVAL;
761b32f4c7eSNicholas Bellinger goto out;
762b32f4c7eSNicholas Bellinger }
763b32f4c7eSNicholas Bellinger
764b32f4c7eSNicholas Bellinger pr_debug("FILEIO: Using buffered I/O"
765b32f4c7eSNicholas Bellinger " operations for struct fd_dev\n");
766b32f4c7eSNicholas Bellinger
767b32f4c7eSNicholas Bellinger fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE;
768b32f4c7eSNicholas Bellinger break;
769769031c9SAndrei Vagin case Opt_fd_async_io:
770769031c9SAndrei Vagin ret = match_int(args, &arg);
771769031c9SAndrei Vagin if (ret)
772769031c9SAndrei Vagin goto out;
773769031c9SAndrei Vagin if (arg != 1) {
774769031c9SAndrei Vagin pr_err("bogus fd_async_io=%d value\n", arg);
775769031c9SAndrei Vagin ret = -EINVAL;
776769031c9SAndrei Vagin goto out;
777769031c9SAndrei Vagin }
778769031c9SAndrei Vagin
779769031c9SAndrei Vagin pr_debug("FILEIO: Using async I/O"
780769031c9SAndrei Vagin " operations for struct fd_dev\n");
781769031c9SAndrei Vagin
782769031c9SAndrei Vagin fd_dev->fbd_flags |= FDBD_HAS_ASYNC_IO;
783769031c9SAndrei Vagin break;
784c66ac9dbSNicholas Bellinger default:
785c66ac9dbSNicholas Bellinger break;
786c66ac9dbSNicholas Bellinger }
787c66ac9dbSNicholas Bellinger }
788c66ac9dbSNicholas Bellinger
789c66ac9dbSNicholas Bellinger out:
790c66ac9dbSNicholas Bellinger kfree(orig);
791c66ac9dbSNicholas Bellinger return (!ret) ? count : ret;
792c66ac9dbSNicholas Bellinger }
793c66ac9dbSNicholas Bellinger
fd_show_configfs_dev_params(struct se_device * dev,char * b)7940fd97ccfSChristoph Hellwig static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b)
795c66ac9dbSNicholas Bellinger {
7960fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev);
797c66ac9dbSNicholas Bellinger ssize_t bl = 0;
798c66ac9dbSNicholas Bellinger
799c66ac9dbSNicholas Bellinger bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id);
800769031c9SAndrei Vagin bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s Async: %d\n",
801b32f4c7eSNicholas Bellinger fd_dev->fd_dev_name, fd_dev->fd_dev_size,
802b32f4c7eSNicholas Bellinger (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ?
803769031c9SAndrei Vagin "Buffered-WCE" : "O_DSYNC",
804769031c9SAndrei Vagin !!(fd_dev->fbd_flags & FDBD_HAS_ASYNC_IO));
805c66ac9dbSNicholas Bellinger return bl;
806c66ac9dbSNicholas Bellinger }
807c66ac9dbSNicholas Bellinger
fd_get_blocks(struct se_device * dev)808c66ac9dbSNicholas Bellinger static sector_t fd_get_blocks(struct se_device *dev)
809c66ac9dbSNicholas Bellinger {
8100fd97ccfSChristoph Hellwig struct fd_dev *fd_dev = FD_DEV(dev);
811cd9323fdSNicholas Bellinger struct file *f = fd_dev->fd_file;
812cd9323fdSNicholas Bellinger struct inode *i = f->f_mapping->host;
813cd9323fdSNicholas Bellinger unsigned long long dev_size;
814cd9323fdSNicholas Bellinger /*
815cd9323fdSNicholas Bellinger * When using a file that references an underlying struct block_device,
816cd9323fdSNicholas Bellinger * ensure dev_size is always based on the current inode size in order
817cd9323fdSNicholas Bellinger * to handle underlying block_device resize operations.
818cd9323fdSNicholas Bellinger */
819cd9323fdSNicholas Bellinger if (S_ISBLK(i->i_mode))
82021363ca8SNicholas Bellinger dev_size = i_size_read(i);
821cd9323fdSNicholas Bellinger else
822cd9323fdSNicholas Bellinger dev_size = fd_dev->fd_dev_size;
823c66ac9dbSNicholas Bellinger
82421363ca8SNicholas Bellinger return div_u64(dev_size - dev->dev_attrib.block_size,
82521363ca8SNicholas Bellinger dev->dev_attrib.block_size);
826c66ac9dbSNicholas Bellinger }
827c66ac9dbSNicholas Bellinger
fd_init_prot(struct se_device * dev)8280f5e2ec4SNicholas Bellinger static int fd_init_prot(struct se_device *dev)
8290f5e2ec4SNicholas Bellinger {
8300f5e2ec4SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev);
8310f5e2ec4SNicholas Bellinger struct file *prot_file, *file = fd_dev->fd_file;
8320f5e2ec4SNicholas Bellinger struct inode *inode;
8330f5e2ec4SNicholas Bellinger int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
8340f5e2ec4SNicholas Bellinger char buf[FD_MAX_DEV_PROT_NAME];
8350f5e2ec4SNicholas Bellinger
8360f5e2ec4SNicholas Bellinger if (!file) {
8370f5e2ec4SNicholas Bellinger pr_err("Unable to locate fd_dev->fd_file\n");
8380f5e2ec4SNicholas Bellinger return -ENODEV;
8390f5e2ec4SNicholas Bellinger }
8400f5e2ec4SNicholas Bellinger
8410f5e2ec4SNicholas Bellinger inode = file->f_mapping->host;
8420f5e2ec4SNicholas Bellinger if (S_ISBLK(inode->i_mode)) {
8430f5e2ec4SNicholas Bellinger pr_err("FILEIO Protection emulation only supported on"
8440f5e2ec4SNicholas Bellinger " !S_ISBLK\n");
8450f5e2ec4SNicholas Bellinger return -ENOSYS;
8460f5e2ec4SNicholas Bellinger }
8470f5e2ec4SNicholas Bellinger
8480f5e2ec4SNicholas Bellinger if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE)
8490f5e2ec4SNicholas Bellinger flags &= ~O_DSYNC;
8500f5e2ec4SNicholas Bellinger
8510f5e2ec4SNicholas Bellinger snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection",
8520f5e2ec4SNicholas Bellinger fd_dev->fd_dev_name);
8530f5e2ec4SNicholas Bellinger
8540f5e2ec4SNicholas Bellinger prot_file = filp_open(buf, flags, 0600);
8550f5e2ec4SNicholas Bellinger if (IS_ERR(prot_file)) {
8560f5e2ec4SNicholas Bellinger pr_err("filp_open(%s) failed\n", buf);
8570f5e2ec4SNicholas Bellinger ret = PTR_ERR(prot_file);
8580f5e2ec4SNicholas Bellinger return ret;
8590f5e2ec4SNicholas Bellinger }
8600f5e2ec4SNicholas Bellinger fd_dev->fd_prot_file = prot_file;
8610f5e2ec4SNicholas Bellinger
8620f5e2ec4SNicholas Bellinger return 0;
8630f5e2ec4SNicholas Bellinger }
8640f5e2ec4SNicholas Bellinger
fd_format_prot(struct se_device * dev)8650f5e2ec4SNicholas Bellinger static int fd_format_prot(struct se_device *dev)
8660f5e2ec4SNicholas Bellinger {
8670f5e2ec4SNicholas Bellinger unsigned char *buf;
8680f5e2ec4SNicholas Bellinger int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size;
86964d240b7SAkinobu Mita int ret;
8700f5e2ec4SNicholas Bellinger
8710f5e2ec4SNicholas Bellinger if (!dev->dev_attrib.pi_prot_type) {
8720f5e2ec4SNicholas Bellinger pr_err("Unable to format_prot while pi_prot_type == 0\n");
8730f5e2ec4SNicholas Bellinger return -ENODEV;
8740f5e2ec4SNicholas Bellinger }
8750f5e2ec4SNicholas Bellinger
8760f5e2ec4SNicholas Bellinger buf = vzalloc(unit_size);
8770f5e2ec4SNicholas Bellinger if (!buf) {
8780f5e2ec4SNicholas Bellinger pr_err("Unable to allocate FILEIO prot buf\n");
8790f5e2ec4SNicholas Bellinger return -ENOMEM;
8800f5e2ec4SNicholas Bellinger }
8810f5e2ec4SNicholas Bellinger
8820f5e2ec4SNicholas Bellinger pr_debug("Using FILEIO prot_length: %llu\n",
88364d240b7SAkinobu Mita (unsigned long long)(dev->transport->get_blocks(dev) + 1) *
88464d240b7SAkinobu Mita dev->prot_length);
8850f5e2ec4SNicholas Bellinger
88664d240b7SAkinobu Mita ret = fd_do_prot_fill(dev, 0, dev->transport->get_blocks(dev) + 1,
88764d240b7SAkinobu Mita buf, unit_size);
8880f5e2ec4SNicholas Bellinger vfree(buf);
8890f5e2ec4SNicholas Bellinger return ret;
8900f5e2ec4SNicholas Bellinger }
8910f5e2ec4SNicholas Bellinger
fd_free_prot(struct se_device * dev)8920f5e2ec4SNicholas Bellinger static void fd_free_prot(struct se_device *dev)
8930f5e2ec4SNicholas Bellinger {
8940f5e2ec4SNicholas Bellinger struct fd_dev *fd_dev = FD_DEV(dev);
8950f5e2ec4SNicholas Bellinger
8960f5e2ec4SNicholas Bellinger if (!fd_dev->fd_prot_file)
8970f5e2ec4SNicholas Bellinger return;
8980f5e2ec4SNicholas Bellinger
8990f5e2ec4SNicholas Bellinger filp_close(fd_dev->fd_prot_file, NULL);
9000f5e2ec4SNicholas Bellinger fd_dev->fd_prot_file = NULL;
9010f5e2ec4SNicholas Bellinger }
9020f5e2ec4SNicholas Bellinger
9030217da08SMike Christie static struct exec_cmd_ops fd_exec_cmd_ops = {
9040c2ad7d1SChristoph Hellwig .execute_rw = fd_execute_rw,
905ad67f0d9SChristoph Hellwig .execute_sync_cache = fd_execute_sync_cache,
9067b745c84SNicholas Bellinger .execute_write_same = fd_execute_write_same,
90750642762SAsias He .execute_unmap = fd_execute_unmap,
9080c2ad7d1SChristoph Hellwig };
9090c2ad7d1SChristoph Hellwig
910de103c93SChristoph Hellwig static sense_reason_t
fd_parse_cdb(struct se_cmd * cmd)911de103c93SChristoph Hellwig fd_parse_cdb(struct se_cmd *cmd)
9120c2ad7d1SChristoph Hellwig {
9130217da08SMike Christie return sbc_parse_cdb(cmd, &fd_exec_cmd_ops);
9140c2ad7d1SChristoph Hellwig }
9150c2ad7d1SChristoph Hellwig
9160a06d430SChristoph Hellwig static const struct target_backend_ops fileio_ops = {
917c66ac9dbSNicholas Bellinger .name = "fileio",
9180fd97ccfSChristoph Hellwig .inquiry_prod = "FILEIO",
9190fd97ccfSChristoph Hellwig .inquiry_rev = FD_VERSION,
920c66ac9dbSNicholas Bellinger .owner = THIS_MODULE,
921c66ac9dbSNicholas Bellinger .attach_hba = fd_attach_hba,
922c66ac9dbSNicholas Bellinger .detach_hba = fd_detach_hba,
9230fd97ccfSChristoph Hellwig .alloc_device = fd_alloc_device,
9240fd97ccfSChristoph Hellwig .configure_device = fd_configure_device,
92592634706SMike Christie .destroy_device = fd_destroy_device,
926c66ac9dbSNicholas Bellinger .free_device = fd_free_device,
92733efaaf6SMike Christie .configure_unmap = fd_configure_unmap,
9280c2ad7d1SChristoph Hellwig .parse_cdb = fd_parse_cdb,
929c66ac9dbSNicholas Bellinger .set_configfs_dev_params = fd_set_configfs_dev_params,
930c66ac9dbSNicholas Bellinger .show_configfs_dev_params = fd_show_configfs_dev_params,
9316f23ac8aSChristoph Hellwig .get_device_type = sbc_get_device_type,
932c66ac9dbSNicholas Bellinger .get_blocks = fd_get_blocks,
9330f5e2ec4SNicholas Bellinger .init_prot = fd_init_prot,
9340f5e2ec4SNicholas Bellinger .format_prot = fd_format_prot,
9350f5e2ec4SNicholas Bellinger .free_prot = fd_free_prot,
9365873c4d1SChristoph Hellwig .tb_dev_attrib_attrs = sbc_attrib_attrs,
937c66ac9dbSNicholas Bellinger };
938c66ac9dbSNicholas Bellinger
fileio_module_init(void)939c66ac9dbSNicholas Bellinger static int __init fileio_module_init(void)
940c66ac9dbSNicholas Bellinger {
9410a06d430SChristoph Hellwig return transport_backend_register(&fileio_ops);
942c66ac9dbSNicholas Bellinger }
943c66ac9dbSNicholas Bellinger
fileio_module_exit(void)94463b91d5aSAsias He static void __exit fileio_module_exit(void)
945c66ac9dbSNicholas Bellinger {
9460a06d430SChristoph Hellwig target_backend_unregister(&fileio_ops);
947c66ac9dbSNicholas Bellinger }
948c66ac9dbSNicholas Bellinger
949c66ac9dbSNicholas Bellinger MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
950c66ac9dbSNicholas Bellinger MODULE_AUTHOR("nab@Linux-iSCSI.org");
951c66ac9dbSNicholas Bellinger MODULE_LICENSE("GPL");
952c66ac9dbSNicholas Bellinger
953c66ac9dbSNicholas Bellinger module_init(fileio_module_init);
954c66ac9dbSNicholas Bellinger module_exit(fileio_module_exit);
955