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TOMOYO Linux Cross Reference
Linux/fs/nfs/blocklayout/blocklayoutdev.c

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  1 /*
  2  *  linux/fs/nfs/blocklayout/blocklayoutdev.c
  3  *
  4  *  Device operations for the pnfs nfs4 file 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 #include <linux/module.h>
 33 #include <linux/buffer_head.h> /* __bread */
 34 
 35 #include <linux/genhd.h>
 36 #include <linux/blkdev.h>
 37 #include <linux/hash.h>
 38 
 39 #include "blocklayout.h"
 40 
 41 #define NFSDBG_FACILITY         NFSDBG_PNFS_LD
 42 
 43 static int decode_sector_number(__be32 **rp, sector_t *sp)
 44 {
 45         uint64_t s;
 46 
 47         *rp = xdr_decode_hyper(*rp, &s);
 48         if (s & 0x1ff) {
 49                 printk(KERN_WARNING "NFS: %s: sector not aligned\n", __func__);
 50                 return -1;
 51         }
 52         *sp = s >> SECTOR_SHIFT;
 53         return 0;
 54 }
 55 
 56 /* Open a block_device by device number. */
 57 struct block_device *nfs4_blkdev_get(dev_t dev)
 58 {
 59         struct block_device *bd;
 60 
 61         dprintk("%s enter\n", __func__);
 62         bd = blkdev_get_by_dev(dev, FMODE_READ, NULL);
 63         if (IS_ERR(bd))
 64                 goto fail;
 65         return bd;
 66 fail:
 67         dprintk("%s failed to open device : %ld\n",
 68                         __func__, PTR_ERR(bd));
 69         return NULL;
 70 }
 71 
 72 /*
 73  * Release the block device
 74  */
 75 int nfs4_blkdev_put(struct block_device *bdev)
 76 {
 77         dprintk("%s for device %d:%d\n", __func__, MAJOR(bdev->bd_dev),
 78                         MINOR(bdev->bd_dev));
 79         return blkdev_put(bdev, FMODE_READ);
 80 }
 81 
 82 ssize_t bl_pipe_downcall(struct file *filp, const char __user *src,
 83                          size_t mlen)
 84 {
 85         struct nfs_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info,
 86                                          nfs_net_id);
 87 
 88         if (mlen != sizeof (struct bl_dev_msg))
 89                 return -EINVAL;
 90 
 91         if (copy_from_user(&nn->bl_mount_reply, src, mlen) != 0)
 92                 return -EFAULT;
 93 
 94         wake_up(&nn->bl_wq);
 95 
 96         return mlen;
 97 }
 98 
 99 void bl_pipe_destroy_msg(struct rpc_pipe_msg *msg)
100 {
101         struct bl_pipe_msg *bl_pipe_msg = container_of(msg, struct bl_pipe_msg, msg);
102 
103         if (msg->errno >= 0)
104                 return;
105         wake_up(bl_pipe_msg->bl_wq);
106 }
107 
108 /*
109  * Decodes pnfs_block_deviceaddr4 which is XDR encoded in dev->dev_addr_buf.
110  */
111 struct pnfs_block_dev *
112 nfs4_blk_decode_device(struct nfs_server *server,
113                        struct pnfs_device *dev)
114 {
115         struct pnfs_block_dev *rv;
116         struct block_device *bd = NULL;
117         struct bl_pipe_msg bl_pipe_msg;
118         struct rpc_pipe_msg *msg = &bl_pipe_msg.msg;
119         struct bl_msg_hdr bl_msg = {
120                 .type = BL_DEVICE_MOUNT,
121                 .totallen = dev->mincount,
122         };
123         uint8_t *dataptr;
124         DECLARE_WAITQUEUE(wq, current);
125         int offset, len, i, rc;
126         struct net *net = server->nfs_client->net;
127         struct nfs_net *nn = net_generic(net, nfs_net_id);
128         struct bl_dev_msg *reply = &nn->bl_mount_reply;
129 
130         dprintk("%s CREATING PIPEFS MESSAGE\n", __func__);
131         dprintk("%s: deviceid: %s, mincount: %d\n", __func__, dev->dev_id.data,
132                 dev->mincount);
133 
134         bl_pipe_msg.bl_wq = &nn->bl_wq;
135         memset(msg, 0, sizeof(*msg));
136         msg->data = kzalloc(sizeof(bl_msg) + dev->mincount, GFP_NOFS);
137         if (!msg->data) {
138                 rv = ERR_PTR(-ENOMEM);
139                 goto out;
140         }
141 
142         memcpy(msg->data, &bl_msg, sizeof(bl_msg));
143         dataptr = (uint8_t *) msg->data;
144         len = dev->mincount;
145         offset = sizeof(bl_msg);
146         for (i = 0; len > 0; i++) {
147                 memcpy(&dataptr[offset], page_address(dev->pages[i]),
148                                 len < PAGE_CACHE_SIZE ? len : PAGE_CACHE_SIZE);
149                 len -= PAGE_CACHE_SIZE;
150                 offset += PAGE_CACHE_SIZE;
151         }
152         msg->len = sizeof(bl_msg) + dev->mincount;
153 
154         dprintk("%s CALLING USERSPACE DAEMON\n", __func__);
155         add_wait_queue(&nn->bl_wq, &wq);
156         rc = rpc_queue_upcall(nn->bl_device_pipe, msg);
157         if (rc < 0) {
158                 remove_wait_queue(&nn->bl_wq, &wq);
159                 rv = ERR_PTR(rc);
160                 goto out;
161         }
162 
163         set_current_state(TASK_UNINTERRUPTIBLE);
164         schedule();
165         __set_current_state(TASK_RUNNING);
166         remove_wait_queue(&nn->bl_wq, &wq);
167 
168         if (reply->status != BL_DEVICE_REQUEST_PROC) {
169                 dprintk("%s failed to open device: %d\n",
170                         __func__, reply->status);
171                 rv = ERR_PTR(-EINVAL);
172                 goto out;
173         }
174 
175         bd = nfs4_blkdev_get(MKDEV(reply->major, reply->minor));
176         if (IS_ERR(bd)) {
177                 rc = PTR_ERR(bd);
178                 dprintk("%s failed to open device : %d\n", __func__, rc);
179                 rv = ERR_PTR(rc);
180                 goto out;
181         }
182 
183         rv = kzalloc(sizeof(*rv), GFP_NOFS);
184         if (!rv) {
185                 rv = ERR_PTR(-ENOMEM);
186                 goto out;
187         }
188 
189         rv->bm_mdev = bd;
190         memcpy(&rv->bm_mdevid, &dev->dev_id, sizeof(struct nfs4_deviceid));
191         rv->net = net;
192         dprintk("%s Created device %s with bd_block_size %u\n",
193                 __func__,
194                 bd->bd_disk->disk_name,
195                 bd->bd_block_size);
196 
197 out:
198         kfree(msg->data);
199         return rv;
200 }
201 
202 /* Map deviceid returned by the server to constructed block_device */
203 static struct block_device *translate_devid(struct pnfs_layout_hdr *lo,
204                                             struct nfs4_deviceid *id)
205 {
206         struct block_device *rv = NULL;
207         struct block_mount_id *mid;
208         struct pnfs_block_dev *dev;
209 
210         dprintk("%s enter, lo=%p, id=%p\n", __func__, lo, id);
211         mid = BLK_ID(lo);
212         spin_lock(&mid->bm_lock);
213         list_for_each_entry(dev, &mid->bm_devlist, bm_node) {
214                 if (memcmp(id->data, dev->bm_mdevid.data,
215                            NFS4_DEVICEID4_SIZE) == 0) {
216                         rv = dev->bm_mdev;
217                         goto out;
218                 }
219         }
220  out:
221         spin_unlock(&mid->bm_lock);
222         dprintk("%s returning %p\n", __func__, rv);
223         return rv;
224 }
225 
226 /* Tracks info needed to ensure extents in layout obey constraints of spec */
227 struct layout_verification {
228         u32 mode;       /* R or RW */
229         u64 start;      /* Expected start of next non-COW extent */
230         u64 inval;      /* Start of INVAL coverage */
231         u64 cowread;    /* End of COW read coverage */
232 };
233 
234 /* Verify the extent meets the layout requirements of the pnfs-block draft,
235  * section 2.3.1.
236  */
237 static int verify_extent(struct pnfs_block_extent *be,
238                          struct layout_verification *lv)
239 {
240         if (lv->mode == IOMODE_READ) {
241                 if (be->be_state == PNFS_BLOCK_READWRITE_DATA ||
242                     be->be_state == PNFS_BLOCK_INVALID_DATA)
243                         return -EIO;
244                 if (be->be_f_offset != lv->start)
245                         return -EIO;
246                 lv->start += be->be_length;
247                 return 0;
248         }
249         /* lv->mode == IOMODE_RW */
250         if (be->be_state == PNFS_BLOCK_READWRITE_DATA) {
251                 if (be->be_f_offset != lv->start)
252                         return -EIO;
253                 if (lv->cowread > lv->start)
254                         return -EIO;
255                 lv->start += be->be_length;
256                 lv->inval = lv->start;
257                 return 0;
258         } else if (be->be_state == PNFS_BLOCK_INVALID_DATA) {
259                 if (be->be_f_offset != lv->start)
260                         return -EIO;
261                 lv->start += be->be_length;
262                 return 0;
263         } else if (be->be_state == PNFS_BLOCK_READ_DATA) {
264                 if (be->be_f_offset > lv->start)
265                         return -EIO;
266                 if (be->be_f_offset < lv->inval)
267                         return -EIO;
268                 if (be->be_f_offset < lv->cowread)
269                         return -EIO;
270                 /* It looks like you might want to min this with lv->start,
271                  * but you really don't.
272                  */
273                 lv->inval = lv->inval + be->be_length;
274                 lv->cowread = be->be_f_offset + be->be_length;
275                 return 0;
276         } else
277                 return -EIO;
278 }
279 
280 /* XDR decode pnfs_block_layout4 structure */
281 int
282 nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo,
283                            struct nfs4_layoutget_res *lgr, gfp_t gfp_flags)
284 {
285         struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
286         int i, status = -EIO;
287         uint32_t count;
288         struct pnfs_block_extent *be = NULL, *save;
289         struct xdr_stream stream;
290         struct xdr_buf buf;
291         struct page *scratch;
292         __be32 *p;
293         struct layout_verification lv = {
294                 .mode = lgr->range.iomode,
295                 .start = lgr->range.offset >> SECTOR_SHIFT,
296                 .inval = lgr->range.offset >> SECTOR_SHIFT,
297                 .cowread = lgr->range.offset >> SECTOR_SHIFT,
298         };
299         LIST_HEAD(extents);
300 
301         dprintk("---> %s\n", __func__);
302 
303         scratch = alloc_page(gfp_flags);
304         if (!scratch)
305                 return -ENOMEM;
306 
307         xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len);
308         xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
309 
310         p = xdr_inline_decode(&stream, 4);
311         if (unlikely(!p))
312                 goto out_err;
313 
314         count = be32_to_cpup(p++);
315 
316         dprintk("%s enter, number of extents %i\n", __func__, count);
317         p = xdr_inline_decode(&stream, (28 + NFS4_DEVICEID4_SIZE) * count);
318         if (unlikely(!p))
319                 goto out_err;
320 
321         /* Decode individual extents, putting them in temporary
322          * staging area until whole layout is decoded to make error
323          * recovery easier.
324          */
325         for (i = 0; i < count; i++) {
326                 be = bl_alloc_extent();
327                 if (!be) {
328                         status = -ENOMEM;
329                         goto out_err;
330                 }
331                 memcpy(&be->be_devid, p, NFS4_DEVICEID4_SIZE);
332                 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
333                 be->be_mdev = translate_devid(lo, &be->be_devid);
334                 if (!be->be_mdev)
335                         goto out_err;
336 
337                 /* The next three values are read in as bytes,
338                  * but stored as 512-byte sector lengths
339                  */
340                 if (decode_sector_number(&p, &be->be_f_offset) < 0)
341                         goto out_err;
342                 if (decode_sector_number(&p, &be->be_length) < 0)
343                         goto out_err;
344                 if (decode_sector_number(&p, &be->be_v_offset) < 0)
345                         goto out_err;
346                 be->be_state = be32_to_cpup(p++);
347                 if (be->be_state == PNFS_BLOCK_INVALID_DATA)
348                         be->be_inval = &bl->bl_inval;
349                 if (verify_extent(be, &lv)) {
350                         dprintk("%s verify failed\n", __func__);
351                         goto out_err;
352                 }
353                 list_add_tail(&be->be_node, &extents);
354         }
355         if (lgr->range.offset + lgr->range.length !=
356                         lv.start << SECTOR_SHIFT) {
357                 dprintk("%s Final length mismatch\n", __func__);
358                 be = NULL;
359                 goto out_err;
360         }
361         if (lv.start < lv.cowread) {
362                 dprintk("%s Final uncovered COW extent\n", __func__);
363                 be = NULL;
364                 goto out_err;
365         }
366         /* Extents decoded properly, now try to merge them in to
367          * existing layout extents.
368          */
369         spin_lock(&bl->bl_ext_lock);
370         list_for_each_entry_safe(be, save, &extents, be_node) {
371                 list_del(&be->be_node);
372                 status = bl_add_merge_extent(bl, be);
373                 if (status) {
374                         spin_unlock(&bl->bl_ext_lock);
375                         /* This is a fairly catastrophic error, as the
376                          * entire layout extent lists are now corrupted.
377                          * We should have some way to distinguish this.
378                          */
379                         be = NULL;
380                         goto out_err;
381                 }
382         }
383         spin_unlock(&bl->bl_ext_lock);
384         status = 0;
385  out:
386         __free_page(scratch);
387         dprintk("%s returns %i\n", __func__, status);
388         return status;
389 
390  out_err:
391         bl_put_extent(be);
392         while (!list_empty(&extents)) {
393                 be = list_first_entry(&extents, struct pnfs_block_extent,
394                                       be_node);
395                 list_del(&be->be_node);
396                 bl_put_extent(be);
397         }
398         goto out;
399 }
400 

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