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>
14 #include "blocklayoutxdr.h"
17 #define NFSDDBG_FACILITY NFSDDBG_PNFS
21 nfsd4_block_proc_layoutget(struct inode
*inode
, const struct svc_fh
*fhp
,
22 struct nfsd4_layoutget
*args
)
24 struct nfsd4_layout_seg
*seg
= &args
->lg_seg
;
25 struct super_block
*sb
= inode
->i_sb
;
26 u32 block_size
= (1 << inode
->i_blkbits
);
27 struct pnfs_block_extent
*bex
;
29 u32 device_generation
= 0;
32 if (seg
->offset
& (block_size
- 1)) {
33 dprintk("pnfsd: I/O misaligned\n");
34 goto out_layoutunavailable
;
38 * Some clients barf on non-zero block numbers for NONE or INVALID
39 * layouts, so make sure to zero the whole structure.
42 bex
= kzalloc(sizeof(*bex
), GFP_KERNEL
);
45 args
->lg_content
= bex
;
47 error
= sb
->s_export_op
->map_blocks(inode
, seg
->offset
, seg
->length
,
48 &iomap
, seg
->iomode
!= IOMODE_READ
,
52 goto out_layoutunavailable
;
56 if (iomap
.length
< args
->lg_minlength
) {
57 dprintk("pnfsd: extent smaller than minlength\n");
58 goto out_layoutunavailable
;
63 if (seg
->iomode
== IOMODE_READ
)
64 bex
->es
= PNFS_BLOCK_READ_DATA
;
66 bex
->es
= PNFS_BLOCK_READWRITE_DATA
;
67 bex
->soff
= (iomap
.blkno
<< 9);
70 if (seg
->iomode
& IOMODE_RW
) {
72 * Crack monkey special case from section 2.3.1.
74 if (args
->lg_minlength
== 0) {
75 dprintk("pnfsd: no soup for you!\n");
76 goto out_layoutunavailable
;
79 bex
->es
= PNFS_BLOCK_INVALID_DATA
;
80 bex
->soff
= (iomap
.blkno
<< 9);
85 if (seg
->iomode
== IOMODE_READ
) {
86 bex
->es
= PNFS_BLOCK_NONE_DATA
;
92 WARN(1, "pnfsd: filesystem returned %d extent\n", iomap
.type
);
93 goto out_layoutunavailable
;
96 error
= nfsd4_set_deviceid(&bex
->vol_id
, fhp
, device_generation
);
99 bex
->foff
= iomap
.offset
;
100 bex
->len
= iomap
.length
;
102 seg
->offset
= iomap
.offset
;
103 seg
->length
= iomap
.length
;
105 dprintk("GET: 0x%llx:0x%llx %d\n", bex
->foff
, bex
->len
, bex
->es
);
110 return nfserrno(error
);
111 out_layoutunavailable
:
113 return nfserr_layoutunavailable
;
117 nfsd4_block_commit_blocks(struct inode
*inode
, struct nfsd4_layoutcommit
*lcp
,
118 struct iomap
*iomaps
, int nr_iomaps
)
120 loff_t new_size
= lcp
->lc_last_wr
+ 1;
121 struct iattr iattr
= { .ia_valid
= 0 };
124 if (lcp
->lc_mtime
.tv_nsec
== UTIME_NOW
||
125 timespec_compare(&lcp
->lc_mtime
, &inode
->i_mtime
) < 0)
126 lcp
->lc_mtime
= current_fs_time(inode
->i_sb
);
127 iattr
.ia_valid
|= ATTR_ATIME
| ATTR_CTIME
| ATTR_MTIME
;
128 iattr
.ia_atime
= iattr
.ia_ctime
= iattr
.ia_mtime
= lcp
->lc_mtime
;
130 if (new_size
> i_size_read(inode
)) {
131 iattr
.ia_valid
|= ATTR_SIZE
;
132 iattr
.ia_size
= new_size
;
135 error
= inode
->i_sb
->s_export_op
->commit_blocks(inode
, iomaps
,
138 return nfserrno(error
);
141 #ifdef CONFIG_NFSD_BLOCKLAYOUT
143 nfsd4_block_get_device_info_simple(struct super_block
*sb
,
144 struct nfsd4_getdeviceinfo
*gdp
)
146 struct pnfs_block_deviceaddr
*dev
;
147 struct pnfs_block_volume
*b
;
149 dev
= kzalloc(sizeof(struct pnfs_block_deviceaddr
) +
150 sizeof(struct pnfs_block_volume
), GFP_KERNEL
);
153 gdp
->gd_device
= dev
;
156 b
= &dev
->volumes
[0];
158 b
->type
= PNFS_BLOCK_VOLUME_SIMPLE
;
159 b
->simple
.sig_len
= PNFS_BLOCK_UUID_LEN
;
160 return sb
->s_export_op
->get_uuid(sb
, b
->simple
.sig
, &b
->simple
.sig_len
,
165 nfsd4_block_proc_getdeviceinfo(struct super_block
*sb
,
166 struct nfs4_client
*clp
,
167 struct nfsd4_getdeviceinfo
*gdp
)
169 if (sb
->s_bdev
!= sb
->s_bdev
->bd_contains
)
171 return nfserrno(nfsd4_block_get_device_info_simple(sb
, gdp
));
175 nfsd4_block_proc_layoutcommit(struct inode
*inode
,
176 struct nfsd4_layoutcommit
*lcp
)
178 struct iomap
*iomaps
;
181 nr_iomaps
= nfsd4_block_decode_layoutupdate(lcp
->lc_up_layout
,
182 lcp
->lc_up_len
, &iomaps
, 1 << inode
->i_blkbits
);
184 return nfserrno(nr_iomaps
);
186 return nfsd4_block_commit_blocks(inode
, lcp
, iomaps
, nr_iomaps
);
189 const struct nfsd4_layout_ops bl_layout_ops
= {
191 * Pretend that we send notification to the client. This is a blatant
192 * lie to force recent Linux clients to cache our device IDs.
193 * We rarely ever change the device ID, so the harm of leaking deviceids
194 * for a while isn't too bad. Unfortunately RFC5661 is a complete mess
195 * in this regard, but I filed errata 4119 for this a while ago, and
196 * hopefully the Linux client will eventually start caching deviceids
197 * without this again.
200 NOTIFY_DEVICEID4_DELETE
| NOTIFY_DEVICEID4_CHANGE
,
201 .proc_getdeviceinfo
= nfsd4_block_proc_getdeviceinfo
,
202 .encode_getdeviceinfo
= nfsd4_block_encode_getdeviceinfo
,
203 .proc_layoutget
= nfsd4_block_proc_layoutget
,
204 .encode_layoutget
= nfsd4_block_encode_layoutget
,
205 .proc_layoutcommit
= nfsd4_block_proc_layoutcommit
,
207 #endif /* CONFIG_NFSD_BLOCKLAYOUT */
209 #ifdef CONFIG_NFSD_SCSILAYOUT
210 static int nfsd4_scsi_identify_device(struct block_device
*bdev
,
211 struct pnfs_block_volume
*b
)
213 struct request_queue
*q
= bdev
->bd_disk
->queue
;
215 size_t bufflen
= 252, len
, id_len
;
216 u8
*buf
, *d
, type
, assoc
;
219 buf
= kzalloc(bufflen
, GFP_KERNEL
);
223 rq
= blk_get_request(q
, READ
, GFP_KERNEL
);
228 blk_rq_set_block_pc(rq
);
230 error
= blk_rq_map_kern(q
, rq
, buf
, bufflen
, GFP_KERNEL
);
232 goto out_put_request
;
234 rq
->cmd
[0] = INQUIRY
;
237 rq
->cmd
[3] = bufflen
>> 8;
238 rq
->cmd
[4] = bufflen
& 0xff;
239 rq
->cmd_len
= COMMAND_SIZE(INQUIRY
);
241 error
= blk_execute_rq(rq
->q
, NULL
, rq
, 1);
243 pr_err("pNFS: INQUIRY 0x83 failed with: %x\n",
245 goto out_put_request
;
248 len
= (buf
[2] << 8) + buf
[3] + 4;
250 pr_err("pNFS: INQUIRY 0x83 response invalid (len = %zd)\n",
252 goto out_put_request
;
256 for (d
= buf
+ 4; d
< buf
+ len
; d
+= id_len
+ 4) {
259 assoc
= (d
[1] >> 4) & 0x3;
262 * We only care about a EUI-64 and NAA designator types
263 * with LU association.
267 if (type
!= 0x02 && type
!= 0x03)
269 if (id_len
!= 8 && id_len
!= 12 && id_len
!= 16)
272 b
->scsi
.code_set
= PS_CODE_SET_BINARY
;
273 b
->scsi
.designator_type
= type
== 0x02 ?
274 PS_DESIGNATOR_EUI64
: PS_DESIGNATOR_NAA
;
275 b
->scsi
.designator_len
= id_len
;
276 memcpy(b
->scsi
.designator
, d
+ 4, id_len
);
279 * If we found a 8 or 12 byte descriptor continue on to
280 * see if a 16 byte one is available. If we find a
281 * 16 byte descriptor we're done.
294 #define NFSD_MDS_PR_KEY 0x0100000000000000
297 * We use the client ID as a unique key for the reservations.
298 * This allows us to easily fence a client when recalls fail.
300 static u64
nfsd4_scsi_pr_key(struct nfs4_client
*clp
)
302 return ((u64
)clp
->cl_clientid
.cl_boot
<< 32) | clp
->cl_clientid
.cl_id
;
306 nfsd4_block_get_device_info_scsi(struct super_block
*sb
,
307 struct nfs4_client
*clp
,
308 struct nfsd4_getdeviceinfo
*gdp
)
310 struct pnfs_block_deviceaddr
*dev
;
311 struct pnfs_block_volume
*b
;
312 const struct pr_ops
*ops
;
315 dev
= kzalloc(sizeof(struct pnfs_block_deviceaddr
) +
316 sizeof(struct pnfs_block_volume
), GFP_KERNEL
);
319 gdp
->gd_device
= dev
;
322 b
= &dev
->volumes
[0];
324 b
->type
= PNFS_BLOCK_VOLUME_SCSI
;
325 b
->scsi
.pr_key
= nfsd4_scsi_pr_key(clp
);
327 error
= nfsd4_scsi_identify_device(sb
->s_bdev
, b
);
331 ops
= sb
->s_bdev
->bd_disk
->fops
->pr_ops
;
333 pr_err("pNFS: device %s does not support PRs.\n",
338 error
= ops
->pr_register(sb
->s_bdev
, 0, NFSD_MDS_PR_KEY
, true);
340 pr_err("pNFS: failed to register key for device %s.\n",
345 error
= ops
->pr_reserve(sb
->s_bdev
, NFSD_MDS_PR_KEY
,
346 PR_EXCLUSIVE_ACCESS_REG_ONLY
, 0);
348 pr_err("pNFS: failed to reserve device %s.\n",
357 nfsd4_scsi_proc_getdeviceinfo(struct super_block
*sb
,
358 struct nfs4_client
*clp
,
359 struct nfsd4_getdeviceinfo
*gdp
)
361 if (sb
->s_bdev
!= sb
->s_bdev
->bd_contains
)
363 return nfserrno(nfsd4_block_get_device_info_scsi(sb
, clp
, gdp
));
366 nfsd4_scsi_proc_layoutcommit(struct inode
*inode
,
367 struct nfsd4_layoutcommit
*lcp
)
369 struct iomap
*iomaps
;
372 nr_iomaps
= nfsd4_scsi_decode_layoutupdate(lcp
->lc_up_layout
,
373 lcp
->lc_up_len
, &iomaps
, 1 << inode
->i_blkbits
);
375 return nfserrno(nr_iomaps
);
377 return nfsd4_block_commit_blocks(inode
, lcp
, iomaps
, nr_iomaps
);
381 nfsd4_scsi_fence_client(struct nfs4_layout_stateid
*ls
)
383 struct nfs4_client
*clp
= ls
->ls_stid
.sc_client
;
384 struct block_device
*bdev
= ls
->ls_file
->f_path
.mnt
->mnt_sb
->s_bdev
;
386 bdev
->bd_disk
->fops
->pr_ops
->pr_preempt(bdev
, NFSD_MDS_PR_KEY
,
387 nfsd4_scsi_pr_key(clp
), 0, true);
390 const struct nfsd4_layout_ops scsi_layout_ops
= {
392 * Pretend that we send notification to the client. This is a blatant
393 * lie to force recent Linux clients to cache our device IDs.
394 * We rarely ever change the device ID, so the harm of leaking deviceids
395 * for a while isn't too bad. Unfortunately RFC5661 is a complete mess
396 * in this regard, but I filed errata 4119 for this a while ago, and
397 * hopefully the Linux client will eventually start caching deviceids
398 * without this again.
401 NOTIFY_DEVICEID4_DELETE
| NOTIFY_DEVICEID4_CHANGE
,
402 .proc_getdeviceinfo
= nfsd4_scsi_proc_getdeviceinfo
,
403 .encode_getdeviceinfo
= nfsd4_block_encode_getdeviceinfo
,
404 .proc_layoutget
= nfsd4_block_proc_layoutget
,
405 .encode_layoutget
= nfsd4_block_encode_layoutget
,
406 .proc_layoutcommit
= nfsd4_scsi_proc_layoutcommit
,
407 .fence_client
= nfsd4_scsi_fence_client
,
409 #endif /* CONFIG_NFSD_SCSILAYOUT */