2 * Copyright (c) 2014-2016 Christoph Hellwig.
4 #include <linux/exportfs.h>
5 #include <linux/iomap.h>
6 #include <linux/genhd.h>
7 #include <linux/slab.h>
10 #include <linux/nfsd/debug.h>
11 #include <scsi/scsi_proto.h>
12 #include <scsi/scsi_common.h>
13 #include <scsi/scsi_request.h>
15 #include "blocklayoutxdr.h"
18 #define NFSDDBG_FACILITY NFSDDBG_PNFS
22 nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp,
23 struct nfsd4_layoutget *args)
25 struct nfsd4_layout_seg *seg = &args->lg_seg;
26 struct super_block *sb = inode->i_sb;
27 u32 block_size = i_blocksize(inode);
28 struct pnfs_block_extent *bex;
30 u32 device_generation = 0;
33 if (seg->offset & (block_size - 1)) {
34 dprintk("pnfsd: I/O misaligned\n");
35 goto out_layoutunavailable;
39 * Some clients barf on non-zero block numbers for NONE or INVALID
40 * layouts, so make sure to zero the whole structure.
43 bex = kzalloc(sizeof(*bex), GFP_KERNEL);
46 args->lg_content = bex;
48 error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length,
49 &iomap, seg->iomode != IOMODE_READ,
53 goto out_layoutunavailable;
57 if (iomap.length < args->lg_minlength) {
58 dprintk("pnfsd: extent smaller than minlength\n");
59 goto out_layoutunavailable;
64 if (seg->iomode == IOMODE_READ)
65 bex->es = PNFS_BLOCK_READ_DATA;
67 bex->es = PNFS_BLOCK_READWRITE_DATA;
68 bex->soff = (iomap.blkno << 9);
71 if (seg->iomode & IOMODE_RW) {
73 * Crack monkey special case from section 2.3.1.
75 if (args->lg_minlength == 0) {
76 dprintk("pnfsd: no soup for you!\n");
77 goto out_layoutunavailable;
80 bex->es = PNFS_BLOCK_INVALID_DATA;
81 bex->soff = (iomap.blkno << 9);
86 if (seg->iomode == IOMODE_READ) {
87 bex->es = PNFS_BLOCK_NONE_DATA;
93 WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type);
94 goto out_layoutunavailable;
97 error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation);
100 bex->foff = iomap.offset;
101 bex->len = iomap.length;
103 seg->offset = iomap.offset;
104 seg->length = iomap.length;
106 dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es);
111 return nfserrno(error);
112 out_layoutunavailable:
114 return nfserr_layoutunavailable;
118 nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp,
119 struct iomap *iomaps, int nr_iomaps)
121 loff_t new_size = lcp->lc_last_wr + 1;
122 struct iattr iattr = { .ia_valid = 0 };
125 if (lcp->lc_mtime.tv_nsec == UTIME_NOW ||
126 timespec_compare(&lcp->lc_mtime, &inode->i_mtime) < 0)
127 lcp->lc_mtime = current_time(inode);
128 iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME;
129 iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime;
131 if (new_size > i_size_read(inode)) {
132 iattr.ia_valid |= ATTR_SIZE;
133 iattr.ia_size = new_size;
136 error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps,
139 return nfserrno(error);
142 #ifdef CONFIG_NFSD_BLOCKLAYOUT
144 nfsd4_block_get_device_info_simple(struct super_block *sb,
145 struct nfsd4_getdeviceinfo *gdp)
147 struct pnfs_block_deviceaddr *dev;
148 struct pnfs_block_volume *b;
150 dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
151 sizeof(struct pnfs_block_volume), GFP_KERNEL);
154 gdp->gd_device = dev;
157 b = &dev->volumes[0];
159 b->type = PNFS_BLOCK_VOLUME_SIMPLE;
160 b->simple.sig_len = PNFS_BLOCK_UUID_LEN;
161 return sb->s_export_op->get_uuid(sb, b->simple.sig, &b->simple.sig_len,
166 nfsd4_block_proc_getdeviceinfo(struct super_block *sb,
167 struct svc_rqst *rqstp,
168 struct nfs4_client *clp,
169 struct nfsd4_getdeviceinfo *gdp)
171 if (sb->s_bdev != sb->s_bdev->bd_contains)
173 return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp));
177 nfsd4_block_proc_layoutcommit(struct inode *inode,
178 struct nfsd4_layoutcommit *lcp)
180 struct iomap *iomaps;
183 nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout,
184 lcp->lc_up_len, &iomaps, i_blocksize(inode));
186 return nfserrno(nr_iomaps);
188 return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps);
191 const struct nfsd4_layout_ops bl_layout_ops = {
193 * Pretend that we send notification to the client. This is a blatant
194 * lie to force recent Linux clients to cache our device IDs.
195 * We rarely ever change the device ID, so the harm of leaking deviceids
196 * for a while isn't too bad. Unfortunately RFC5661 is a complete mess
197 * in this regard, but I filed errata 4119 for this a while ago, and
198 * hopefully the Linux client will eventually start caching deviceids
199 * without this again.
202 NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
203 .proc_getdeviceinfo = nfsd4_block_proc_getdeviceinfo,
204 .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo,
205 .proc_layoutget = nfsd4_block_proc_layoutget,
206 .encode_layoutget = nfsd4_block_encode_layoutget,
207 .proc_layoutcommit = nfsd4_block_proc_layoutcommit,
209 #endif /* CONFIG_NFSD_BLOCKLAYOUT */
211 #ifdef CONFIG_NFSD_SCSILAYOUT
212 static int nfsd4_scsi_identify_device(struct block_device *bdev,
213 struct pnfs_block_volume *b)
215 struct request_queue *q = bdev->bd_disk->queue;
217 struct scsi_request *req;
218 size_t bufflen = 252, len, id_len;
219 u8 *buf, *d, type, assoc;
222 buf = kzalloc(bufflen, GFP_KERNEL);
226 rq = blk_get_request(q, REQ_OP_SCSI_IN, GFP_KERNEL);
234 error = blk_rq_map_kern(q, rq, buf, bufflen, GFP_KERNEL);
236 goto out_put_request;
238 req->cmd[0] = INQUIRY;
241 req->cmd[3] = bufflen >> 8;
242 req->cmd[4] = bufflen & 0xff;
243 req->cmd_len = COMMAND_SIZE(INQUIRY);
245 blk_execute_rq(rq->q, NULL, rq, 1);
247 pr_err("pNFS: INQUIRY 0x83 failed with: %x\n",
250 goto out_put_request;
253 len = (buf[2] << 8) + buf[3] + 4;
255 pr_err("pNFS: INQUIRY 0x83 response invalid (len = %zd)\n",
257 goto out_put_request;
261 for (d = buf + 4; d < buf + len; d += id_len + 4) {
264 assoc = (d[1] >> 4) & 0x3;
267 * We only care about a EUI-64 and NAA designator types
268 * with LU association.
272 if (type != 0x02 && type != 0x03)
274 if (id_len != 8 && id_len != 12 && id_len != 16)
277 b->scsi.code_set = PS_CODE_SET_BINARY;
278 b->scsi.designator_type = type == 0x02 ?
279 PS_DESIGNATOR_EUI64 : PS_DESIGNATOR_NAA;
280 b->scsi.designator_len = id_len;
281 memcpy(b->scsi.designator, d + 4, id_len);
284 * If we found a 8 or 12 byte descriptor continue on to
285 * see if a 16 byte one is available. If we find a
286 * 16 byte descriptor we're done.
299 #define NFSD_MDS_PR_KEY 0x0100000000000000ULL
302 * We use the client ID as a unique key for the reservations.
303 * This allows us to easily fence a client when recalls fail.
305 static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp)
307 return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id;
311 nfsd4_block_get_device_info_scsi(struct super_block *sb,
312 struct nfs4_client *clp,
313 struct nfsd4_getdeviceinfo *gdp)
315 struct pnfs_block_deviceaddr *dev;
316 struct pnfs_block_volume *b;
317 const struct pr_ops *ops;
320 dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
321 sizeof(struct pnfs_block_volume), GFP_KERNEL);
324 gdp->gd_device = dev;
327 b = &dev->volumes[0];
329 b->type = PNFS_BLOCK_VOLUME_SCSI;
330 b->scsi.pr_key = nfsd4_scsi_pr_key(clp);
332 error = nfsd4_scsi_identify_device(sb->s_bdev, b);
336 ops = sb->s_bdev->bd_disk->fops->pr_ops;
338 pr_err("pNFS: device %s does not support PRs.\n",
343 error = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true);
345 pr_err("pNFS: failed to register key for device %s.\n",
350 error = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY,
351 PR_EXCLUSIVE_ACCESS_REG_ONLY, 0);
353 pr_err("pNFS: failed to reserve device %s.\n",
362 nfsd4_scsi_proc_getdeviceinfo(struct super_block *sb,
363 struct svc_rqst *rqstp,
364 struct nfs4_client *clp,
365 struct nfsd4_getdeviceinfo *gdp)
367 if (sb->s_bdev != sb->s_bdev->bd_contains)
369 return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp));
372 nfsd4_scsi_proc_layoutcommit(struct inode *inode,
373 struct nfsd4_layoutcommit *lcp)
375 struct iomap *iomaps;
378 nr_iomaps = nfsd4_scsi_decode_layoutupdate(lcp->lc_up_layout,
379 lcp->lc_up_len, &iomaps, i_blocksize(inode));
381 return nfserrno(nr_iomaps);
383 return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps);
387 nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls)
389 struct nfs4_client *clp = ls->ls_stid.sc_client;
390 struct block_device *bdev = ls->ls_file->f_path.mnt->mnt_sb->s_bdev;
392 bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY,
393 nfsd4_scsi_pr_key(clp), 0, true);
396 const struct nfsd4_layout_ops scsi_layout_ops = {
398 * Pretend that we send notification to the client. This is a blatant
399 * lie to force recent Linux clients to cache our device IDs.
400 * We rarely ever change the device ID, so the harm of leaking deviceids
401 * for a while isn't too bad. Unfortunately RFC5661 is a complete mess
402 * in this regard, but I filed errata 4119 for this a while ago, and
403 * hopefully the Linux client will eventually start caching deviceids
404 * without this again.
407 NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
408 .proc_getdeviceinfo = nfsd4_scsi_proc_getdeviceinfo,
409 .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo,
410 .proc_layoutget = nfsd4_block_proc_layoutget,
411 .encode_layoutget = nfsd4_block_encode_layoutget,
412 .proc_layoutcommit = nfsd4_scsi_proc_layoutcommit,
413 .fence_client = nfsd4_scsi_fence_client,
415 #endif /* CONFIG_NFSD_SCSILAYOUT */