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

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