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TOMOYO Linux Cross Reference
Linux/fs/nfsd/blocklayout.c

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  1 /*
  2  * Copyright (c) 2014-2016 Christoph Hellwig.
  3  */
  4 #include <linux/exportfs.h>
  5 #include <linux/iomap.h>
  6 #include <linux/genhd.h>
  7 #include <linux/slab.h>
  8 #include <linux/pr.h>
  9 
 10 #include <linux/nfsd/debug.h>
 11 #include <scsi/scsi_proto.h>
 12 #include <scsi/scsi_common.h>
 13 
 14 #include "blocklayoutxdr.h"
 15 #include "pnfs.h"
 16 
 17 #define NFSDDBG_FACILITY        NFSDDBG_PNFS
 18 
 19 
 20 static __be32
 21 nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp,
 22                 struct nfsd4_layoutget *args)
 23 {
 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;
 28         struct iomap iomap;
 29         u32 device_generation = 0;
 30         int error;
 31 
 32         if (seg->offset & (block_size - 1)) {
 33                 dprintk("pnfsd: I/O misaligned\n");
 34                 goto out_layoutunavailable;
 35         }
 36 
 37         /*
 38          * Some clients barf on non-zero block numbers for NONE or INVALID
 39          * layouts, so make sure to zero the whole structure.
 40          */
 41         error = -ENOMEM;
 42         bex = kzalloc(sizeof(*bex), GFP_KERNEL);
 43         if (!bex)
 44                 goto out_error;
 45         args->lg_content = bex;
 46 
 47         error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length,
 48                                             &iomap, seg->iomode != IOMODE_READ,
 49                                             &device_generation);
 50         if (error) {
 51                 if (error == -ENXIO)
 52                         goto out_layoutunavailable;
 53                 goto out_error;
 54         }
 55 
 56         if (iomap.length < args->lg_minlength) {
 57                 dprintk("pnfsd: extent smaller than minlength\n");
 58                 goto out_layoutunavailable;
 59         }
 60 
 61         switch (iomap.type) {
 62         case IOMAP_MAPPED:
 63                 if (seg->iomode == IOMODE_READ)
 64                         bex->es = PNFS_BLOCK_READ_DATA;
 65                 else
 66                         bex->es = PNFS_BLOCK_READWRITE_DATA;
 67                 bex->soff = (iomap.blkno << 9);
 68                 break;
 69         case IOMAP_UNWRITTEN:
 70                 if (seg->iomode & IOMODE_RW) {
 71                         /*
 72                          * Crack monkey special case from section 2.3.1.
 73                          */
 74                         if (args->lg_minlength == 0) {
 75                                 dprintk("pnfsd: no soup for you!\n");
 76                                 goto out_layoutunavailable;
 77                         }
 78 
 79                         bex->es = PNFS_BLOCK_INVALID_DATA;
 80                         bex->soff = (iomap.blkno << 9);
 81                         break;
 82                 }
 83                 /*FALLTHRU*/
 84         case IOMAP_HOLE:
 85                 if (seg->iomode == IOMODE_READ) {
 86                         bex->es = PNFS_BLOCK_NONE_DATA;
 87                         break;
 88                 }
 89                 /*FALLTHRU*/
 90         case IOMAP_DELALLOC:
 91         default:
 92                 WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type);
 93                 goto out_layoutunavailable;
 94         }
 95 
 96         error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation);
 97         if (error)
 98                 goto out_error;
 99         bex->foff = iomap.offset;
100         bex->len = iomap.length;
101 
102         seg->offset = iomap.offset;
103         seg->length = iomap.length;
104 
105         dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es);
106         return 0;
107 
108 out_error:
109         seg->length = 0;
110         return nfserrno(error);
111 out_layoutunavailable:
112         seg->length = 0;
113         return nfserr_layoutunavailable;
114 }
115 
116 static __be32
117 nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp,
118                 struct iomap *iomaps, int nr_iomaps)
119 {
120         loff_t new_size = lcp->lc_last_wr + 1;
121         struct iattr iattr = { .ia_valid = 0 };
122         int error;
123 
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;
129 
130         if (new_size > i_size_read(inode)) {
131                 iattr.ia_valid |= ATTR_SIZE;
132                 iattr.ia_size = new_size;
133         }
134 
135         error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps,
136                         nr_iomaps, &iattr);
137         kfree(iomaps);
138         return nfserrno(error);
139 }
140 
141 #ifdef CONFIG_NFSD_BLOCKLAYOUT
142 static int
143 nfsd4_block_get_device_info_simple(struct super_block *sb,
144                 struct nfsd4_getdeviceinfo *gdp)
145 {
146         struct pnfs_block_deviceaddr *dev;
147         struct pnfs_block_volume *b;
148 
149         dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
150                       sizeof(struct pnfs_block_volume), GFP_KERNEL);
151         if (!dev)
152                 return -ENOMEM;
153         gdp->gd_device = dev;
154 
155         dev->nr_volumes = 1;
156         b = &dev->volumes[0];
157 
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,
161                         &b->simple.offset);
162 }
163 
164 static __be32
165 nfsd4_block_proc_getdeviceinfo(struct super_block *sb,
166                 struct svc_rqst *rqstp,
167                 struct nfs4_client *clp,
168                 struct nfsd4_getdeviceinfo *gdp)
169 {
170         if (sb->s_bdev != sb->s_bdev->bd_contains)
171                 return nfserr_inval;
172         return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp));
173 }
174 
175 static __be32
176 nfsd4_block_proc_layoutcommit(struct inode *inode,
177                 struct nfsd4_layoutcommit *lcp)
178 {
179         struct iomap *iomaps;
180         int nr_iomaps;
181 
182         nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout,
183                         lcp->lc_up_len, &iomaps, 1 << inode->i_blkbits);
184         if (nr_iomaps < 0)
185                 return nfserrno(nr_iomaps);
186 
187         return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps);
188 }
189 
190 const struct nfsd4_layout_ops bl_layout_ops = {
191         /*
192          * Pretend that we send notification to the client.  This is a blatant
193          * lie to force recent Linux clients to cache our device IDs.
194          * We rarely ever change the device ID, so the harm of leaking deviceids
195          * for a while isn't too bad.  Unfortunately RFC5661 is a complete mess
196          * in this regard, but I filed errata 4119 for this a while ago, and
197          * hopefully the Linux client will eventually start caching deviceids
198          * without this again.
199          */
200         .notify_types           =
201                         NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
202         .proc_getdeviceinfo     = nfsd4_block_proc_getdeviceinfo,
203         .encode_getdeviceinfo   = nfsd4_block_encode_getdeviceinfo,
204         .proc_layoutget         = nfsd4_block_proc_layoutget,
205         .encode_layoutget       = nfsd4_block_encode_layoutget,
206         .proc_layoutcommit      = nfsd4_block_proc_layoutcommit,
207 };
208 #endif /* CONFIG_NFSD_BLOCKLAYOUT */
209 
210 #ifdef CONFIG_NFSD_SCSILAYOUT
211 static int nfsd4_scsi_identify_device(struct block_device *bdev,
212                 struct pnfs_block_volume *b)
213 {
214         struct request_queue *q = bdev->bd_disk->queue;
215         struct request *rq;
216         size_t bufflen = 252, len, id_len;
217         u8 *buf, *d, type, assoc;
218         int error;
219 
220         buf = kzalloc(bufflen, GFP_KERNEL);
221         if (!buf)
222                 return -ENOMEM;
223 
224         rq = blk_get_request(q, READ, GFP_KERNEL);
225         if (IS_ERR(rq)) {
226                 error = -ENOMEM;
227                 goto out_free_buf;
228         }
229         blk_rq_set_block_pc(rq);
230 
231         error = blk_rq_map_kern(q, rq, buf, bufflen, GFP_KERNEL);
232         if (error)
233                 goto out_put_request;
234 
235         rq->cmd[0] = INQUIRY;
236         rq->cmd[1] = 1;
237         rq->cmd[2] = 0x83;
238         rq->cmd[3] = bufflen >> 8;
239         rq->cmd[4] = bufflen & 0xff;
240         rq->cmd_len = COMMAND_SIZE(INQUIRY);
241 
242         error = blk_execute_rq(rq->q, NULL, rq, 1);
243         if (error) {
244                 pr_err("pNFS: INQUIRY 0x83 failed with: %x\n",
245                         rq->errors);
246                 goto out_put_request;
247         }
248 
249         len = (buf[2] << 8) + buf[3] + 4;
250         if (len > bufflen) {
251                 pr_err("pNFS: INQUIRY 0x83 response invalid (len = %zd)\n",
252                         len);
253                 goto out_put_request;
254         }
255 
256         d = buf + 4;
257         for (d = buf + 4; d < buf + len; d += id_len + 4) {
258                 id_len = d[3];
259                 type = d[1] & 0xf;
260                 assoc = (d[1] >> 4) & 0x3;
261 
262                 /*
263                  * We only care about a EUI-64 and NAA designator types
264                  * with LU association.
265                  */
266                 if (assoc != 0x00)
267                         continue;
268                 if (type != 0x02 && type != 0x03)
269                         continue;
270                 if (id_len != 8 && id_len != 12 && id_len != 16)
271                         continue;
272 
273                 b->scsi.code_set = PS_CODE_SET_BINARY;
274                 b->scsi.designator_type = type == 0x02 ?
275                         PS_DESIGNATOR_EUI64 : PS_DESIGNATOR_NAA;
276                 b->scsi.designator_len = id_len;
277                 memcpy(b->scsi.designator, d + 4, id_len);
278 
279                 /*
280                  * If we found a 8 or 12 byte descriptor continue on to
281                  * see if a 16 byte one is available.  If we find a
282                  * 16 byte descriptor we're done.
283                  */
284                 if (id_len == 16)
285                         break;
286         }
287 
288 out_put_request:
289         blk_put_request(rq);
290 out_free_buf:
291         kfree(buf);
292         return error;
293 }
294 
295 #define NFSD_MDS_PR_KEY         0x0100000000000000ULL
296 
297 /*
298  * We use the client ID as a unique key for the reservations.
299  * This allows us to easily fence a client when recalls fail.
300  */
301 static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp)
302 {
303         return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id;
304 }
305 
306 static int
307 nfsd4_block_get_device_info_scsi(struct super_block *sb,
308                 struct nfs4_client *clp,
309                 struct nfsd4_getdeviceinfo *gdp)
310 {
311         struct pnfs_block_deviceaddr *dev;
312         struct pnfs_block_volume *b;
313         const struct pr_ops *ops;
314         int error;
315 
316         dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
317                       sizeof(struct pnfs_block_volume), GFP_KERNEL);
318         if (!dev)
319                 return -ENOMEM;
320         gdp->gd_device = dev;
321 
322         dev->nr_volumes = 1;
323         b = &dev->volumes[0];
324 
325         b->type = PNFS_BLOCK_VOLUME_SCSI;
326         b->scsi.pr_key = nfsd4_scsi_pr_key(clp);
327 
328         error = nfsd4_scsi_identify_device(sb->s_bdev, b);
329         if (error)
330                 return error;
331 
332         ops = sb->s_bdev->bd_disk->fops->pr_ops;
333         if (!ops) {
334                 pr_err("pNFS: device %s does not support PRs.\n",
335                         sb->s_id);
336                 return -EINVAL;
337         }
338 
339         error = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true);
340         if (error) {
341                 pr_err("pNFS: failed to register key for device %s.\n",
342                         sb->s_id);
343                 return -EINVAL;
344         }
345 
346         error = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY,
347                         PR_EXCLUSIVE_ACCESS_REG_ONLY, 0);
348         if (error) {
349                 pr_err("pNFS: failed to reserve device %s.\n",
350                         sb->s_id);
351                 return -EINVAL;
352         }
353 
354         return 0;
355 }
356 
357 static __be32
358 nfsd4_scsi_proc_getdeviceinfo(struct super_block *sb,
359                 struct svc_rqst *rqstp,
360                 struct nfs4_client *clp,
361                 struct nfsd4_getdeviceinfo *gdp)
362 {
363         if (sb->s_bdev != sb->s_bdev->bd_contains)
364                 return nfserr_inval;
365         return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp));
366 }
367 static __be32
368 nfsd4_scsi_proc_layoutcommit(struct inode *inode,
369                 struct nfsd4_layoutcommit *lcp)
370 {
371         struct iomap *iomaps;
372         int nr_iomaps;
373 
374         nr_iomaps = nfsd4_scsi_decode_layoutupdate(lcp->lc_up_layout,
375                         lcp->lc_up_len, &iomaps, 1 << inode->i_blkbits);
376         if (nr_iomaps < 0)
377                 return nfserrno(nr_iomaps);
378 
379         return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps);
380 }
381 
382 static void
383 nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls)
384 {
385         struct nfs4_client *clp = ls->ls_stid.sc_client;
386         struct block_device *bdev = ls->ls_file->f_path.mnt->mnt_sb->s_bdev;
387 
388         bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY,
389                         nfsd4_scsi_pr_key(clp), 0, true);
390 }
391 
392 const struct nfsd4_layout_ops scsi_layout_ops = {
393         /*
394          * Pretend that we send notification to the client.  This is a blatant
395          * lie to force recent Linux clients to cache our device IDs.
396          * We rarely ever change the device ID, so the harm of leaking deviceids
397          * for a while isn't too bad.  Unfortunately RFC5661 is a complete mess
398          * in this regard, but I filed errata 4119 for this a while ago, and
399          * hopefully the Linux client will eventually start caching deviceids
400          * without this again.
401          */
402         .notify_types           =
403                         NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
404         .proc_getdeviceinfo     = nfsd4_scsi_proc_getdeviceinfo,
405         .encode_getdeviceinfo   = nfsd4_block_encode_getdeviceinfo,
406         .proc_layoutget         = nfsd4_block_proc_layoutget,
407         .encode_layoutget       = nfsd4_block_encode_layoutget,
408         .proc_layoutcommit      = nfsd4_scsi_proc_layoutcommit,
409         .fence_client           = nfsd4_scsi_fence_client,
410 };
411 #endif /* CONFIG_NFSD_SCSILAYOUT */
412 

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