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Linux/fs/nfs/blocklayout/blocklayout.c

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  1 /*
  2  *  linux/fs/nfs/blocklayout/blocklayout.c
  3  *
  4  *  Module for the NFSv4.1 pNFS block layout driver.
  5  *
  6  *  Copyright (c) 2006 The Regents of the University of Michigan.
  7  *  All rights reserved.
  8  *
  9  *  Andy Adamson <andros@citi.umich.edu>
 10  *  Fred Isaman <iisaman@umich.edu>
 11  *
 12  * permission is granted to use, copy, create derivative works and
 13  * redistribute this software and such derivative works for any purpose,
 14  * so long as the name of the university of michigan is not used in
 15  * any advertising or publicity pertaining to the use or distribution
 16  * of this software without specific, written prior authorization.  if
 17  * the above copyright notice or any other identification of the
 18  * university of michigan is included in any copy of any portion of
 19  * this software, then the disclaimer below must also be included.
 20  *
 21  * this software is provided as is, without representation from the
 22  * university of michigan as to its fitness for any purpose, and without
 23  * warranty by the university of michigan of any kind, either express
 24  * or implied, including without limitation the implied warranties of
 25  * merchantability and fitness for a particular purpose.  the regents
 26  * of the university of michigan shall not be liable for any damages,
 27  * including special, indirect, incidental, or consequential damages,
 28  * with respect to any claim arising out or in connection with the use
 29  * of the software, even if it has been or is hereafter advised of the
 30  * possibility of such damages.
 31  */
 32 
 33 #include <linux/module.h>
 34 #include <linux/init.h>
 35 #include <linux/mount.h>
 36 #include <linux/namei.h>
 37 #include <linux/bio.h>          /* struct bio */
 38 #include <linux/prefetch.h>
 39 #include <linux/pagevec.h>
 40 
 41 #include "../pnfs.h"
 42 #include "../nfs4session.h"
 43 #include "../internal.h"
 44 #include "blocklayout.h"
 45 
 46 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
 47 
 48 MODULE_LICENSE("GPL");
 49 MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>");
 50 MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver");
 51 
 52 static bool is_hole(struct pnfs_block_extent *be)
 53 {
 54         switch (be->be_state) {
 55         case PNFS_BLOCK_NONE_DATA:
 56                 return true;
 57         case PNFS_BLOCK_INVALID_DATA:
 58                 return be->be_tag ? false : true;
 59         default:
 60                 return false;
 61         }
 62 }
 63 
 64 /* The data we are handed might be spread across several bios.  We need
 65  * to track when the last one is finished.
 66  */
 67 struct parallel_io {
 68         struct kref refcnt;
 69         void (*pnfs_callback) (void *data);
 70         void *data;
 71 };
 72 
 73 static inline struct parallel_io *alloc_parallel(void *data)
 74 {
 75         struct parallel_io *rv;
 76 
 77         rv  = kmalloc(sizeof(*rv), GFP_NOFS);
 78         if (rv) {
 79                 rv->data = data;
 80                 kref_init(&rv->refcnt);
 81         }
 82         return rv;
 83 }
 84 
 85 static inline void get_parallel(struct parallel_io *p)
 86 {
 87         kref_get(&p->refcnt);
 88 }
 89 
 90 static void destroy_parallel(struct kref *kref)
 91 {
 92         struct parallel_io *p = container_of(kref, struct parallel_io, refcnt);
 93 
 94         dprintk("%s enter\n", __func__);
 95         p->pnfs_callback(p->data);
 96         kfree(p);
 97 }
 98 
 99 static inline void put_parallel(struct parallel_io *p)
100 {
101         kref_put(&p->refcnt, destroy_parallel);
102 }
103 
104 static struct bio *
105 bl_submit_bio(struct bio *bio)
106 {
107         if (bio) {
108                 get_parallel(bio->bi_private);
109                 dprintk("%s submitting %s bio %u@%llu\n", __func__,
110                         bio_op(bio) == READ ? "read" : "write",
111                         bio->bi_iter.bi_size,
112                         (unsigned long long)bio->bi_iter.bi_sector);
113                 submit_bio(bio);
114         }
115         return NULL;
116 }
117 
118 static struct bio *
119 bl_alloc_init_bio(int npg, struct block_device *bdev, sector_t disk_sector,
120                 bio_end_io_t end_io, struct parallel_io *par)
121 {
122         struct bio *bio;
123 
124         npg = min(npg, BIO_MAX_PAGES);
125         bio = bio_alloc(GFP_NOIO, npg);
126         if (!bio && (current->flags & PF_MEMALLOC)) {
127                 while (!bio && (npg /= 2))
128                         bio = bio_alloc(GFP_NOIO, npg);
129         }
130 
131         if (bio) {
132                 bio->bi_iter.bi_sector = disk_sector;
133                 bio_set_dev(bio, bdev);
134                 bio->bi_end_io = end_io;
135                 bio->bi_private = par;
136         }
137         return bio;
138 }
139 
140 static bool offset_in_map(u64 offset, struct pnfs_block_dev_map *map)
141 {
142         return offset >= map->start && offset < map->start + map->len;
143 }
144 
145 static struct bio *
146 do_add_page_to_bio(struct bio *bio, int npg, int rw, sector_t isect,
147                 struct page *page, struct pnfs_block_dev_map *map,
148                 struct pnfs_block_extent *be, bio_end_io_t end_io,
149                 struct parallel_io *par, unsigned int offset, int *len)
150 {
151         struct pnfs_block_dev *dev =
152                 container_of(be->be_device, struct pnfs_block_dev, node);
153         u64 disk_addr, end;
154 
155         dprintk("%s: npg %d rw %d isect %llu offset %u len %d\n", __func__,
156                 npg, rw, (unsigned long long)isect, offset, *len);
157 
158         /* translate to device offset */
159         isect += be->be_v_offset;
160         isect -= be->be_f_offset;
161 
162         /* translate to physical disk offset */
163         disk_addr = (u64)isect << SECTOR_SHIFT;
164         if (!offset_in_map(disk_addr, map)) {
165                 if (!dev->map(dev, disk_addr, map) || !offset_in_map(disk_addr, map))
166                         return ERR_PTR(-EIO);
167                 bio = bl_submit_bio(bio);
168         }
169         disk_addr += map->disk_offset;
170         disk_addr -= map->start;
171 
172         /* limit length to what the device mapping allows */
173         end = disk_addr + *len;
174         if (end >= map->start + map->len)
175                 *len = map->start + map->len - disk_addr;
176 
177 retry:
178         if (!bio) {
179                 bio = bl_alloc_init_bio(npg, map->bdev,
180                                 disk_addr >> SECTOR_SHIFT, end_io, par);
181                 if (!bio)
182                         return ERR_PTR(-ENOMEM);
183                 bio_set_op_attrs(bio, rw, 0);
184         }
185         if (bio_add_page(bio, page, *len, offset) < *len) {
186                 bio = bl_submit_bio(bio);
187                 goto retry;
188         }
189         return bio;
190 }
191 
192 static void bl_mark_devices_unavailable(struct nfs_pgio_header *header, bool rw)
193 {
194         struct pnfs_block_layout *bl = BLK_LSEG2EXT(header->lseg);
195         size_t bytes_left = header->args.count;
196         sector_t isect, extent_length = 0;
197         struct pnfs_block_extent be;
198 
199         isect = header->args.offset >> SECTOR_SHIFT;
200         bytes_left += header->args.offset - (isect << SECTOR_SHIFT);
201 
202         while (bytes_left > 0) {
203                 if (!ext_tree_lookup(bl, isect, &be, rw))
204                                 return;
205                 extent_length = be.be_length - (isect - be.be_f_offset);
206                 nfs4_mark_deviceid_unavailable(be.be_device);
207                 isect += extent_length;
208                 if (bytes_left > extent_length << SECTOR_SHIFT)
209                         bytes_left -= extent_length << SECTOR_SHIFT;
210                 else
211                         bytes_left = 0;
212         }
213 }
214 
215 static void bl_end_io_read(struct bio *bio)
216 {
217         struct parallel_io *par = bio->bi_private;
218 
219         if (bio->bi_status) {
220                 struct nfs_pgio_header *header = par->data;
221 
222                 if (!header->pnfs_error)
223                         header->pnfs_error = -EIO;
224                 pnfs_set_lo_fail(header->lseg);
225                 bl_mark_devices_unavailable(header, false);
226         }
227 
228         bio_put(bio);
229         put_parallel(par);
230 }
231 
232 static void bl_read_cleanup(struct work_struct *work)
233 {
234         struct rpc_task *task;
235         struct nfs_pgio_header *hdr;
236         dprintk("%s enter\n", __func__);
237         task = container_of(work, struct rpc_task, u.tk_work);
238         hdr = container_of(task, struct nfs_pgio_header, task);
239         pnfs_ld_read_done(hdr);
240 }
241 
242 static void
243 bl_end_par_io_read(void *data)
244 {
245         struct nfs_pgio_header *hdr = data;
246 
247         hdr->task.tk_status = hdr->pnfs_error;
248         INIT_WORK(&hdr->task.u.tk_work, bl_read_cleanup);
249         schedule_work(&hdr->task.u.tk_work);
250 }
251 
252 static enum pnfs_try_status
253 bl_read_pagelist(struct nfs_pgio_header *header)
254 {
255         struct pnfs_block_layout *bl = BLK_LSEG2EXT(header->lseg);
256         struct pnfs_block_dev_map map = { .start = NFS4_MAX_UINT64 };
257         struct bio *bio = NULL;
258         struct pnfs_block_extent be;
259         sector_t isect, extent_length = 0;
260         struct parallel_io *par;
261         loff_t f_offset = header->args.offset;
262         size_t bytes_left = header->args.count;
263         unsigned int pg_offset = header->args.pgbase, pg_len;
264         struct page **pages = header->args.pages;
265         int pg_index = header->args.pgbase >> PAGE_SHIFT;
266         const bool is_dio = (header->dreq != NULL);
267         struct blk_plug plug;
268         int i;
269 
270         dprintk("%s enter nr_pages %u offset %lld count %u\n", __func__,
271                 header->page_array.npages, f_offset,
272                 (unsigned int)header->args.count);
273 
274         par = alloc_parallel(header);
275         if (!par)
276                 return PNFS_NOT_ATTEMPTED;
277         par->pnfs_callback = bl_end_par_io_read;
278 
279         blk_start_plug(&plug);
280 
281         isect = (sector_t) (f_offset >> SECTOR_SHIFT);
282         /* Code assumes extents are page-aligned */
283         for (i = pg_index; i < header->page_array.npages; i++) {
284                 if (extent_length <= 0) {
285                         /* We've used up the previous extent */
286                         bio = bl_submit_bio(bio);
287 
288                         /* Get the next one */
289                         if (!ext_tree_lookup(bl, isect, &be, false)) {
290                                 header->pnfs_error = -EIO;
291                                 goto out;
292                         }
293                         extent_length = be.be_length - (isect - be.be_f_offset);
294                 }
295 
296                 if (is_dio) {
297                         if (pg_offset + bytes_left > PAGE_SIZE)
298                                 pg_len = PAGE_SIZE - pg_offset;
299                         else
300                                 pg_len = bytes_left;
301                 } else {
302                         BUG_ON(pg_offset != 0);
303                         pg_len = PAGE_SIZE;
304                 }
305 
306                 if (is_hole(&be)) {
307                         bio = bl_submit_bio(bio);
308                         /* Fill hole w/ zeroes w/o accessing device */
309                         dprintk("%s Zeroing page for hole\n", __func__);
310                         zero_user_segment(pages[i], pg_offset, pg_len);
311 
312                         /* invalidate map */
313                         map.start = NFS4_MAX_UINT64;
314                 } else {
315                         bio = do_add_page_to_bio(bio,
316                                                  header->page_array.npages - i,
317                                                  READ,
318                                                  isect, pages[i], &map, &be,
319                                                  bl_end_io_read, par,
320                                                  pg_offset, &pg_len);
321                         if (IS_ERR(bio)) {
322                                 header->pnfs_error = PTR_ERR(bio);
323                                 bio = NULL;
324                                 goto out;
325                         }
326                 }
327                 isect += (pg_len >> SECTOR_SHIFT);
328                 extent_length -= (pg_len >> SECTOR_SHIFT);
329                 f_offset += pg_len;
330                 bytes_left -= pg_len;
331                 pg_offset = 0;
332         }
333         if ((isect << SECTOR_SHIFT) >= header->inode->i_size) {
334                 header->res.eof = 1;
335                 header->res.count = header->inode->i_size - header->args.offset;
336         } else {
337                 header->res.count = (isect << SECTOR_SHIFT) - header->args.offset;
338         }
339 out:
340         bl_submit_bio(bio);
341         blk_finish_plug(&plug);
342         put_parallel(par);
343         return PNFS_ATTEMPTED;
344 }
345 
346 static void bl_end_io_write(struct bio *bio)
347 {
348         struct parallel_io *par = bio->bi_private;
349         struct nfs_pgio_header *header = par->data;
350 
351         if (bio->bi_status) {
352                 if (!header->pnfs_error)
353                         header->pnfs_error = -EIO;
354                 pnfs_set_lo_fail(header->lseg);
355                 bl_mark_devices_unavailable(header, true);
356         }
357         bio_put(bio);
358         put_parallel(par);
359 }
360 
361 /* Function scheduled for call during bl_end_par_io_write,
362  * it marks sectors as written and extends the commitlist.
363  */
364 static void bl_write_cleanup(struct work_struct *work)
365 {
366         struct rpc_task *task = container_of(work, struct rpc_task, u.tk_work);
367         struct nfs_pgio_header *hdr =
368                         container_of(task, struct nfs_pgio_header, task);
369 
370         dprintk("%s enter\n", __func__);
371 
372         if (likely(!hdr->pnfs_error)) {
373                 struct pnfs_block_layout *bl = BLK_LSEG2EXT(hdr->lseg);
374                 u64 start = hdr->args.offset & (loff_t)PAGE_MASK;
375                 u64 end = (hdr->args.offset + hdr->args.count +
376                         PAGE_SIZE - 1) & (loff_t)PAGE_MASK;
377                 u64 lwb = hdr->args.offset + hdr->args.count;
378 
379                 ext_tree_mark_written(bl, start >> SECTOR_SHIFT,
380                                         (end - start) >> SECTOR_SHIFT, lwb);
381         }
382 
383         pnfs_ld_write_done(hdr);
384 }
385 
386 /* Called when last of bios associated with a bl_write_pagelist call finishes */
387 static void bl_end_par_io_write(void *data)
388 {
389         struct nfs_pgio_header *hdr = data;
390 
391         hdr->task.tk_status = hdr->pnfs_error;
392         hdr->verf.committed = NFS_FILE_SYNC;
393         INIT_WORK(&hdr->task.u.tk_work, bl_write_cleanup);
394         schedule_work(&hdr->task.u.tk_work);
395 }
396 
397 static enum pnfs_try_status
398 bl_write_pagelist(struct nfs_pgio_header *header, int sync)
399 {
400         struct pnfs_block_layout *bl = BLK_LSEG2EXT(header->lseg);
401         struct pnfs_block_dev_map map = { .start = NFS4_MAX_UINT64 };
402         struct bio *bio = NULL;
403         struct pnfs_block_extent be;
404         sector_t isect, extent_length = 0;
405         struct parallel_io *par = NULL;
406         loff_t offset = header->args.offset;
407         size_t count = header->args.count;
408         struct page **pages = header->args.pages;
409         int pg_index = header->args.pgbase >> PAGE_SHIFT;
410         unsigned int pg_len;
411         struct blk_plug plug;
412         int i;
413 
414         dprintk("%s enter, %zu@%lld\n", __func__, count, offset);
415 
416         /* At this point, header->page_aray is a (sequential) list of nfs_pages.
417          * We want to write each, and if there is an error set pnfs_error
418          * to have it redone using nfs.
419          */
420         par = alloc_parallel(header);
421         if (!par)
422                 return PNFS_NOT_ATTEMPTED;
423         par->pnfs_callback = bl_end_par_io_write;
424 
425         blk_start_plug(&plug);
426 
427         /* we always write out the whole page */
428         offset = offset & (loff_t)PAGE_MASK;
429         isect = offset >> SECTOR_SHIFT;
430 
431         for (i = pg_index; i < header->page_array.npages; i++) {
432                 if (extent_length <= 0) {
433                         /* We've used up the previous extent */
434                         bio = bl_submit_bio(bio);
435                         /* Get the next one */
436                         if (!ext_tree_lookup(bl, isect, &be, true)) {
437                                 header->pnfs_error = -EINVAL;
438                                 goto out;
439                         }
440 
441                         extent_length = be.be_length - (isect - be.be_f_offset);
442                 }
443 
444                 pg_len = PAGE_SIZE;
445                 bio = do_add_page_to_bio(bio, header->page_array.npages - i,
446                                          WRITE, isect, pages[i], &map, &be,
447                                          bl_end_io_write, par,
448                                          0, &pg_len);
449                 if (IS_ERR(bio)) {
450                         header->pnfs_error = PTR_ERR(bio);
451                         bio = NULL;
452                         goto out;
453                 }
454 
455                 offset += pg_len;
456                 count -= pg_len;
457                 isect += (pg_len >> SECTOR_SHIFT);
458                 extent_length -= (pg_len >> SECTOR_SHIFT);
459         }
460 
461         header->res.count = header->args.count;
462 out:
463         bl_submit_bio(bio);
464         blk_finish_plug(&plug);
465         put_parallel(par);
466         return PNFS_ATTEMPTED;
467 }
468 
469 static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo)
470 {
471         struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
472         int err;
473 
474         dprintk("%s enter\n", __func__);
475 
476         err = ext_tree_remove(bl, true, 0, LLONG_MAX);
477         WARN_ON(err);
478 
479         kfree(bl);
480 }
481 
482 static struct pnfs_layout_hdr *__bl_alloc_layout_hdr(struct inode *inode,
483                 gfp_t gfp_flags, bool is_scsi_layout)
484 {
485         struct pnfs_block_layout *bl;
486 
487         dprintk("%s enter\n", __func__);
488         bl = kzalloc(sizeof(*bl), gfp_flags);
489         if (!bl)
490                 return NULL;
491 
492         bl->bl_ext_rw = RB_ROOT;
493         bl->bl_ext_ro = RB_ROOT;
494         spin_lock_init(&bl->bl_ext_lock);
495 
496         bl->bl_scsi_layout = is_scsi_layout;
497         return &bl->bl_layout;
498 }
499 
500 static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode,
501                                                    gfp_t gfp_flags)
502 {
503         return __bl_alloc_layout_hdr(inode, gfp_flags, false);
504 }
505 
506 static struct pnfs_layout_hdr *sl_alloc_layout_hdr(struct inode *inode,
507                                                    gfp_t gfp_flags)
508 {
509         return __bl_alloc_layout_hdr(inode, gfp_flags, true);
510 }
511 
512 static void bl_free_lseg(struct pnfs_layout_segment *lseg)
513 {
514         dprintk("%s enter\n", __func__);
515         kfree(lseg);
516 }
517 
518 /* Tracks info needed to ensure extents in layout obey constraints of spec */
519 struct layout_verification {
520         u32 mode;       /* R or RW */
521         u64 start;      /* Expected start of next non-COW extent */
522         u64 inval;      /* Start of INVAL coverage */
523         u64 cowread;    /* End of COW read coverage */
524 };
525 
526 /* Verify the extent meets the layout requirements of the pnfs-block draft,
527  * section 2.3.1.
528  */
529 static int verify_extent(struct pnfs_block_extent *be,
530                          struct layout_verification *lv)
531 {
532         if (lv->mode == IOMODE_READ) {
533                 if (be->be_state == PNFS_BLOCK_READWRITE_DATA ||
534                     be->be_state == PNFS_BLOCK_INVALID_DATA)
535                         return -EIO;
536                 if (be->be_f_offset != lv->start)
537                         return -EIO;
538                 lv->start += be->be_length;
539                 return 0;
540         }
541         /* lv->mode == IOMODE_RW */
542         if (be->be_state == PNFS_BLOCK_READWRITE_DATA) {
543                 if (be->be_f_offset != lv->start)
544                         return -EIO;
545                 if (lv->cowread > lv->start)
546                         return -EIO;
547                 lv->start += be->be_length;
548                 lv->inval = lv->start;
549                 return 0;
550         } else if (be->be_state == PNFS_BLOCK_INVALID_DATA) {
551                 if (be->be_f_offset != lv->start)
552                         return -EIO;
553                 lv->start += be->be_length;
554                 return 0;
555         } else if (be->be_state == PNFS_BLOCK_READ_DATA) {
556                 if (be->be_f_offset > lv->start)
557                         return -EIO;
558                 if (be->be_f_offset < lv->inval)
559                         return -EIO;
560                 if (be->be_f_offset < lv->cowread)
561                         return -EIO;
562                 /* It looks like you might want to min this with lv->start,
563                  * but you really don't.
564                  */
565                 lv->inval = lv->inval + be->be_length;
566                 lv->cowread = be->be_f_offset + be->be_length;
567                 return 0;
568         } else
569                 return -EIO;
570 }
571 
572 static int decode_sector_number(__be32 **rp, sector_t *sp)
573 {
574         uint64_t s;
575 
576         *rp = xdr_decode_hyper(*rp, &s);
577         if (s & 0x1ff) {
578                 printk(KERN_WARNING "NFS: %s: sector not aligned\n", __func__);
579                 return -1;
580         }
581         *sp = s >> SECTOR_SHIFT;
582         return 0;
583 }
584 
585 static struct nfs4_deviceid_node *
586 bl_find_get_deviceid(struct nfs_server *server,
587                 const struct nfs4_deviceid *id, struct rpc_cred *cred,
588                 gfp_t gfp_mask)
589 {
590         struct nfs4_deviceid_node *node;
591         unsigned long start, end;
592 
593 retry:
594         node = nfs4_find_get_deviceid(server, id, cred, gfp_mask);
595         if (!node)
596                 return ERR_PTR(-ENODEV);
597 
598         if (test_bit(NFS_DEVICEID_UNAVAILABLE, &node->flags) == 0)
599                 return node;
600 
601         end = jiffies;
602         start = end - PNFS_DEVICE_RETRY_TIMEOUT;
603         if (!time_in_range(node->timestamp_unavailable, start, end)) {
604                 nfs4_delete_deviceid(node->ld, node->nfs_client, id);
605                 goto retry;
606         }
607         return ERR_PTR(-ENODEV);
608 }
609 
610 static int
611 bl_alloc_extent(struct xdr_stream *xdr, struct pnfs_layout_hdr *lo,
612                 struct layout_verification *lv, struct list_head *extents,
613                 gfp_t gfp_mask)
614 {
615         struct pnfs_block_extent *be;
616         struct nfs4_deviceid id;
617         int error;
618         __be32 *p;
619 
620         p = xdr_inline_decode(xdr, 28 + NFS4_DEVICEID4_SIZE);
621         if (!p)
622                 return -EIO;
623 
624         be = kzalloc(sizeof(*be), GFP_NOFS);
625         if (!be)
626                 return -ENOMEM;
627 
628         memcpy(&id, p, NFS4_DEVICEID4_SIZE);
629         p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
630 
631         be->be_device = bl_find_get_deviceid(NFS_SERVER(lo->plh_inode), &id,
632                                                 lo->plh_lc_cred, gfp_mask);
633         if (IS_ERR(be->be_device)) {
634                 error = PTR_ERR(be->be_device);
635                 goto out_free_be;
636         }
637 
638         /*
639          * The next three values are read in as bytes, but stored in the
640          * extent structure in 512-byte granularity.
641          */
642         error = -EIO;
643         if (decode_sector_number(&p, &be->be_f_offset) < 0)
644                 goto out_put_deviceid;
645         if (decode_sector_number(&p, &be->be_length) < 0)
646                 goto out_put_deviceid;
647         if (decode_sector_number(&p, &be->be_v_offset) < 0)
648                 goto out_put_deviceid;
649         be->be_state = be32_to_cpup(p++);
650 
651         error = verify_extent(be, lv);
652         if (error) {
653                 dprintk("%s: extent verification failed\n", __func__);
654                 goto out_put_deviceid;
655         }
656 
657         list_add_tail(&be->be_list, extents);
658         return 0;
659 
660 out_put_deviceid:
661         nfs4_put_deviceid_node(be->be_device);
662 out_free_be:
663         kfree(be);
664         return error;
665 }
666 
667 static struct pnfs_layout_segment *
668 bl_alloc_lseg(struct pnfs_layout_hdr *lo, struct nfs4_layoutget_res *lgr,
669                 gfp_t gfp_mask)
670 {
671         struct layout_verification lv = {
672                 .mode = lgr->range.iomode,
673                 .start = lgr->range.offset >> SECTOR_SHIFT,
674                 .inval = lgr->range.offset >> SECTOR_SHIFT,
675                 .cowread = lgr->range.offset >> SECTOR_SHIFT,
676         };
677         struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
678         struct pnfs_layout_segment *lseg;
679         struct xdr_buf buf;
680         struct xdr_stream xdr;
681         struct page *scratch;
682         int status, i;
683         uint32_t count;
684         __be32 *p;
685         LIST_HEAD(extents);
686 
687         dprintk("---> %s\n", __func__);
688 
689         lseg = kzalloc(sizeof(*lseg), gfp_mask);
690         if (!lseg)
691                 return ERR_PTR(-ENOMEM);
692 
693         status = -ENOMEM;
694         scratch = alloc_page(gfp_mask);
695         if (!scratch)
696                 goto out;
697 
698         xdr_init_decode_pages(&xdr, &buf,
699                         lgr->layoutp->pages, lgr->layoutp->len);
700         xdr_set_scratch_buffer(&xdr, page_address(scratch), PAGE_SIZE);
701 
702         status = -EIO;
703         p = xdr_inline_decode(&xdr, 4);
704         if (unlikely(!p))
705                 goto out_free_scratch;
706 
707         count = be32_to_cpup(p++);
708         dprintk("%s: number of extents %d\n", __func__, count);
709 
710         /*
711          * Decode individual extents, putting them in temporary staging area
712          * until whole layout is decoded to make error recovery easier.
713          */
714         for (i = 0; i < count; i++) {
715                 status = bl_alloc_extent(&xdr, lo, &lv, &extents, gfp_mask);
716                 if (status)
717                         goto process_extents;
718         }
719 
720         if (lgr->range.offset + lgr->range.length !=
721                         lv.start << SECTOR_SHIFT) {
722                 dprintk("%s Final length mismatch\n", __func__);
723                 status = -EIO;
724                 goto process_extents;
725         }
726 
727         if (lv.start < lv.cowread) {
728                 dprintk("%s Final uncovered COW extent\n", __func__);
729                 status = -EIO;
730         }
731 
732 process_extents:
733         while (!list_empty(&extents)) {
734                 struct pnfs_block_extent *be =
735                         list_first_entry(&extents, struct pnfs_block_extent,
736                                          be_list);
737                 list_del(&be->be_list);
738 
739                 if (!status)
740                         status = ext_tree_insert(bl, be);
741 
742                 if (status) {
743                         nfs4_put_deviceid_node(be->be_device);
744                         kfree(be);
745                 }
746         }
747 
748 out_free_scratch:
749         __free_page(scratch);
750 out:
751         dprintk("%s returns %d\n", __func__, status);
752         switch (status) {
753         case -ENODEV:
754                 /* Our extent block devices are unavailable */
755                 set_bit(NFS_LSEG_UNAVAILABLE, &lseg->pls_flags);
756         case 0:
757                 return lseg;
758         default:
759                 kfree(lseg);
760                 return ERR_PTR(status);
761         }
762 }
763 
764 static void
765 bl_return_range(struct pnfs_layout_hdr *lo,
766                 struct pnfs_layout_range *range)
767 {
768         struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
769         sector_t offset = range->offset >> SECTOR_SHIFT, end;
770 
771         if (range->offset % 8) {
772                 dprintk("%s: offset %lld not block size aligned\n",
773                         __func__, range->offset);
774                 return;
775         }
776 
777         if (range->length != NFS4_MAX_UINT64) {
778                 if (range->length % 8) {
779                         dprintk("%s: length %lld not block size aligned\n",
780                                 __func__, range->length);
781                         return;
782                 }
783 
784                 end = offset + (range->length >> SECTOR_SHIFT);
785         } else {
786                 end = round_down(NFS4_MAX_UINT64, PAGE_SIZE);
787         }
788 
789         ext_tree_remove(bl, range->iomode & IOMODE_RW, offset, end);
790 }
791 
792 static int
793 bl_prepare_layoutcommit(struct nfs4_layoutcommit_args *arg)
794 {
795         return ext_tree_prepare_commit(arg);
796 }
797 
798 static void
799 bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata)
800 {
801         ext_tree_mark_committed(&lcdata->args, lcdata->res.status);
802 }
803 
804 static int
805 bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh)
806 {
807         dprintk("%s enter\n", __func__);
808 
809         if (server->pnfs_blksize == 0) {
810                 dprintk("%s Server did not return blksize\n", __func__);
811                 return -EINVAL;
812         }
813         if (server->pnfs_blksize > PAGE_SIZE) {
814                 printk(KERN_ERR "%s: pNFS blksize %d not supported.\n",
815                         __func__, server->pnfs_blksize);
816                 return -EINVAL;
817         }
818 
819         return 0;
820 }
821 
822 static bool
823 is_aligned_req(struct nfs_pageio_descriptor *pgio,
824                 struct nfs_page *req, unsigned int alignment, bool is_write)
825 {
826         /*
827          * Always accept buffered writes, higher layers take care of the
828          * right alignment.
829          */
830         if (pgio->pg_dreq == NULL)
831                 return true;
832 
833         if (!IS_ALIGNED(req->wb_offset, alignment))
834                 return false;
835 
836         if (IS_ALIGNED(req->wb_bytes, alignment))
837                 return true;
838 
839         if (is_write &&
840             (req_offset(req) + req->wb_bytes == i_size_read(pgio->pg_inode))) {
841                 /*
842                  * If the write goes up to the inode size, just write
843                  * the full page.  Data past the inode size is
844                  * guaranteed to be zeroed by the higher level client
845                  * code, and this behaviour is mandated by RFC 5663
846                  * section 2.3.2.
847                  */
848                 return true;
849         }
850 
851         return false;
852 }
853 
854 static void
855 bl_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
856 {
857         if (!is_aligned_req(pgio, req, SECTOR_SIZE, false)) {
858                 nfs_pageio_reset_read_mds(pgio);
859                 return;
860         }
861 
862         pnfs_generic_pg_init_read(pgio, req);
863 
864         if (pgio->pg_lseg &&
865                 test_bit(NFS_LSEG_UNAVAILABLE, &pgio->pg_lseg->pls_flags)) {
866                 pnfs_error_mark_layout_for_return(pgio->pg_inode, pgio->pg_lseg);
867                 pnfs_set_lo_fail(pgio->pg_lseg);
868                 nfs_pageio_reset_read_mds(pgio);
869         }
870 }
871 
872 /*
873  * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
874  * of bytes (maximum @req->wb_bytes) that can be coalesced.
875  */
876 static size_t
877 bl_pg_test_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
878                 struct nfs_page *req)
879 {
880         if (!is_aligned_req(pgio, req, SECTOR_SIZE, false))
881                 return 0;
882         return pnfs_generic_pg_test(pgio, prev, req);
883 }
884 
885 /*
886  * Return the number of contiguous bytes for a given inode
887  * starting at page frame idx.
888  */
889 static u64 pnfs_num_cont_bytes(struct inode *inode, pgoff_t idx)
890 {
891         struct address_space *mapping = inode->i_mapping;
892         pgoff_t end;
893 
894         /* Optimize common case that writes from 0 to end of file */
895         end = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
896         if (end != inode->i_mapping->nrpages) {
897                 rcu_read_lock();
898                 end = page_cache_next_hole(mapping, idx + 1, ULONG_MAX);
899                 rcu_read_unlock();
900         }
901 
902         if (!end)
903                 return i_size_read(inode) - (idx << PAGE_SHIFT);
904         else
905                 return (end - idx) << PAGE_SHIFT;
906 }
907 
908 static void
909 bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
910 {
911         u64 wb_size;
912 
913         if (!is_aligned_req(pgio, req, PAGE_SIZE, true)) {
914                 nfs_pageio_reset_write_mds(pgio);
915                 return;
916         }
917 
918         if (pgio->pg_dreq == NULL)
919                 wb_size = pnfs_num_cont_bytes(pgio->pg_inode,
920                                               req->wb_index);
921         else
922                 wb_size = nfs_dreq_bytes_left(pgio->pg_dreq);
923 
924         pnfs_generic_pg_init_write(pgio, req, wb_size);
925 
926         if (pgio->pg_lseg &&
927                 test_bit(NFS_LSEG_UNAVAILABLE, &pgio->pg_lseg->pls_flags)) {
928 
929                 pnfs_error_mark_layout_for_return(pgio->pg_inode, pgio->pg_lseg);
930                 pnfs_set_lo_fail(pgio->pg_lseg);
931                 nfs_pageio_reset_write_mds(pgio);
932         }
933 }
934 
935 /*
936  * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
937  * of bytes (maximum @req->wb_bytes) that can be coalesced.
938  */
939 static size_t
940 bl_pg_test_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
941                  struct nfs_page *req)
942 {
943         if (!is_aligned_req(pgio, req, PAGE_SIZE, true))
944                 return 0;
945         return pnfs_generic_pg_test(pgio, prev, req);
946 }
947 
948 static const struct nfs_pageio_ops bl_pg_read_ops = {
949         .pg_init = bl_pg_init_read,
950         .pg_test = bl_pg_test_read,
951         .pg_doio = pnfs_generic_pg_readpages,
952         .pg_cleanup = pnfs_generic_pg_cleanup,
953 };
954 
955 static const struct nfs_pageio_ops bl_pg_write_ops = {
956         .pg_init = bl_pg_init_write,
957         .pg_test = bl_pg_test_write,
958         .pg_doio = pnfs_generic_pg_writepages,
959         .pg_cleanup = pnfs_generic_pg_cleanup,
960 };
961 
962 static struct pnfs_layoutdriver_type blocklayout_type = {
963         .id                             = LAYOUT_BLOCK_VOLUME,
964         .name                           = "LAYOUT_BLOCK_VOLUME",
965         .owner                          = THIS_MODULE,
966         .flags                          = PNFS_LAYOUTRET_ON_SETATTR |
967                                           PNFS_LAYOUTRET_ON_ERROR |
968                                           PNFS_READ_WHOLE_PAGE,
969         .read_pagelist                  = bl_read_pagelist,
970         .write_pagelist                 = bl_write_pagelist,
971         .alloc_layout_hdr               = bl_alloc_layout_hdr,
972         .free_layout_hdr                = bl_free_layout_hdr,
973         .alloc_lseg                     = bl_alloc_lseg,
974         .free_lseg                      = bl_free_lseg,
975         .return_range                   = bl_return_range,
976         .prepare_layoutcommit           = bl_prepare_layoutcommit,
977         .cleanup_layoutcommit           = bl_cleanup_layoutcommit,
978         .set_layoutdriver               = bl_set_layoutdriver,
979         .alloc_deviceid_node            = bl_alloc_deviceid_node,
980         .free_deviceid_node             = bl_free_deviceid_node,
981         .pg_read_ops                    = &bl_pg_read_ops,
982         .pg_write_ops                   = &bl_pg_write_ops,
983         .sync                           = pnfs_generic_sync,
984 };
985 
986 static struct pnfs_layoutdriver_type scsilayout_type = {
987         .id                             = LAYOUT_SCSI,
988         .name                           = "LAYOUT_SCSI",
989         .owner                          = THIS_MODULE,
990         .flags                          = PNFS_LAYOUTRET_ON_SETATTR |
991                                           PNFS_LAYOUTRET_ON_ERROR |
992                                           PNFS_READ_WHOLE_PAGE,
993         .read_pagelist                  = bl_read_pagelist,
994         .write_pagelist                 = bl_write_pagelist,
995         .alloc_layout_hdr               = sl_alloc_layout_hdr,
996         .free_layout_hdr                = bl_free_layout_hdr,
997         .alloc_lseg                     = bl_alloc_lseg,
998         .free_lseg                      = bl_free_lseg,
999         .return_range                   = bl_return_range,
1000         .prepare_layoutcommit           = bl_prepare_layoutcommit,
1001         .cleanup_layoutcommit           = bl_cleanup_layoutcommit,
1002         .set_layoutdriver               = bl_set_layoutdriver,
1003         .alloc_deviceid_node            = bl_alloc_deviceid_node,
1004         .free_deviceid_node             = bl_free_deviceid_node,
1005         .pg_read_ops                    = &bl_pg_read_ops,
1006         .pg_write_ops                   = &bl_pg_write_ops,
1007         .sync                           = pnfs_generic_sync,
1008 };
1009 
1010 
1011 static int __init nfs4blocklayout_init(void)
1012 {
1013         int ret;
1014 
1015         dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__);
1016 
1017         ret = bl_init_pipefs();
1018         if (ret)
1019                 goto out;
1020 
1021         ret = pnfs_register_layoutdriver(&blocklayout_type);
1022         if (ret)
1023                 goto out_cleanup_pipe;
1024 
1025         ret = pnfs_register_layoutdriver(&scsilayout_type);
1026         if (ret)
1027                 goto out_unregister_block;
1028         return 0;
1029 
1030 out_unregister_block:
1031         pnfs_unregister_layoutdriver(&blocklayout_type);
1032 out_cleanup_pipe:
1033         bl_cleanup_pipefs();
1034 out:
1035         return ret;
1036 }
1037 
1038 static void __exit nfs4blocklayout_exit(void)
1039 {
1040         dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n",
1041                __func__);
1042 
1043         pnfs_unregister_layoutdriver(&scsilayout_type);
1044         pnfs_unregister_layoutdriver(&blocklayout_type);
1045         bl_cleanup_pipefs();
1046 }
1047 
1048 MODULE_ALIAS("nfs-layouttype4-3");
1049 MODULE_ALIAS("nfs-layouttype4-5");
1050 
1051 module_init(nfs4blocklayout_init);
1052 module_exit(nfs4blocklayout_exit);
1053 

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