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 */