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Linux/fs/nfs/filelayout/filelayoutdev.c

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  1 /*
  2  *  Device operations for the pnfs nfs4 file layout driver.
  3  *
  4  *  Copyright (c) 2002
  5  *  The Regents of the University of Michigan
  6  *  All Rights Reserved
  7  *
  8  *  Dean Hildebrand <dhildebz@umich.edu>
  9  *  Garth Goodson   <Garth.Goodson@netapp.com>
 10  *
 11  *  Permission is granted to use, copy, create derivative works, and
 12  *  redistribute this software and such derivative works for any purpose,
 13  *  so long as the name of the University of Michigan is not used in
 14  *  any advertising or publicity pertaining to the use or distribution
 15  *  of this software without specific, written prior authorization. If
 16  *  the above copyright notice or any other identification of the
 17  *  University of Michigan is included in any copy of any portion of
 18  *  this software, then the disclaimer below must also be included.
 19  *
 20  *  This software is provided as is, without representation or warranty
 21  *  of any kind either express or implied, including without limitation
 22  *  the implied warranties of merchantability, fitness for a particular
 23  *  purpose, or noninfringement.  The Regents of the University of
 24  *  Michigan shall not be liable for any damages, including special,
 25  *  indirect, incidental, or consequential damages, with respect to any
 26  *  claim arising out of or in connection with the use of the software,
 27  *  even if it has been or is hereafter advised of the possibility of
 28  *  such damages.
 29  */
 30 
 31 #include <linux/nfs_fs.h>
 32 #include <linux/vmalloc.h>
 33 #include <linux/module.h>
 34 
 35 #include "../internal.h"
 36 #include "../nfs4session.h"
 37 #include "filelayout.h"
 38 
 39 #define NFSDBG_FACILITY         NFSDBG_PNFS_LD
 40 
 41 static unsigned int dataserver_timeo = NFS4_DEF_DS_TIMEO;
 42 static unsigned int dataserver_retrans = NFS4_DEF_DS_RETRANS;
 43 
 44 void
 45 nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
 46 {
 47         struct nfs4_pnfs_ds *ds;
 48         int i;
 49 
 50         nfs4_print_deviceid(&dsaddr->id_node.deviceid);
 51 
 52         for (i = 0; i < dsaddr->ds_num; i++) {
 53                 ds = dsaddr->ds_list[i];
 54                 if (ds != NULL)
 55                         nfs4_pnfs_ds_put(ds);
 56         }
 57         kfree(dsaddr->stripe_indices);
 58         kfree(dsaddr);
 59 }
 60 
 61 /* Decode opaque device data and return the result */
 62 struct nfs4_file_layout_dsaddr *
 63 nfs4_fl_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
 64                 gfp_t gfp_flags)
 65 {
 66         int i;
 67         u32 cnt, num;
 68         u8 *indexp;
 69         __be32 *p;
 70         u8 *stripe_indices;
 71         u8 max_stripe_index;
 72         struct nfs4_file_layout_dsaddr *dsaddr = NULL;
 73         struct xdr_stream stream;
 74         struct xdr_buf buf;
 75         struct page *scratch;
 76         struct list_head dsaddrs;
 77         struct nfs4_pnfs_ds_addr *da;
 78 
 79         /* set up xdr stream */
 80         scratch = alloc_page(gfp_flags);
 81         if (!scratch)
 82                 goto out_err;
 83 
 84         xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen);
 85         xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
 86 
 87         /* Get the stripe count (number of stripe index) */
 88         p = xdr_inline_decode(&stream, 4);
 89         if (unlikely(!p))
 90                 goto out_err_free_scratch;
 91 
 92         cnt = be32_to_cpup(p);
 93         dprintk("%s stripe count  %d\n", __func__, cnt);
 94         if (cnt > NFS4_PNFS_MAX_STRIPE_CNT) {
 95                 printk(KERN_WARNING "NFS: %s: stripe count %d greater than "
 96                        "supported maximum %d\n", __func__,
 97                         cnt, NFS4_PNFS_MAX_STRIPE_CNT);
 98                 goto out_err_free_scratch;
 99         }
100 
101         /* read stripe indices */
102         stripe_indices = kcalloc(cnt, sizeof(u8), gfp_flags);
103         if (!stripe_indices)
104                 goto out_err_free_scratch;
105 
106         p = xdr_inline_decode(&stream, cnt << 2);
107         if (unlikely(!p))
108                 goto out_err_free_stripe_indices;
109 
110         indexp = &stripe_indices[0];
111         max_stripe_index = 0;
112         for (i = 0; i < cnt; i++) {
113                 *indexp = be32_to_cpup(p++);
114                 max_stripe_index = max(max_stripe_index, *indexp);
115                 indexp++;
116         }
117 
118         /* Check the multipath list count */
119         p = xdr_inline_decode(&stream, 4);
120         if (unlikely(!p))
121                 goto out_err_free_stripe_indices;
122 
123         num = be32_to_cpup(p);
124         dprintk("%s ds_num %u\n", __func__, num);
125         if (num > NFS4_PNFS_MAX_MULTI_CNT) {
126                 printk(KERN_WARNING "NFS: %s: multipath count %d greater than "
127                         "supported maximum %d\n", __func__,
128                         num, NFS4_PNFS_MAX_MULTI_CNT);
129                 goto out_err_free_stripe_indices;
130         }
131 
132         /* validate stripe indices are all < num */
133         if (max_stripe_index >= num) {
134                 printk(KERN_WARNING "NFS: %s: stripe index %u >= num ds %u\n",
135                         __func__, max_stripe_index, num);
136                 goto out_err_free_stripe_indices;
137         }
138 
139         dsaddr = kzalloc(sizeof(*dsaddr) +
140                         (sizeof(struct nfs4_pnfs_ds *) * (num - 1)),
141                         gfp_flags);
142         if (!dsaddr)
143                 goto out_err_free_stripe_indices;
144 
145         dsaddr->stripe_count = cnt;
146         dsaddr->stripe_indices = stripe_indices;
147         stripe_indices = NULL;
148         dsaddr->ds_num = num;
149         nfs4_init_deviceid_node(&dsaddr->id_node, server, &pdev->dev_id);
150 
151         INIT_LIST_HEAD(&dsaddrs);
152 
153         for (i = 0; i < dsaddr->ds_num; i++) {
154                 int j;
155                 u32 mp_count;
156 
157                 p = xdr_inline_decode(&stream, 4);
158                 if (unlikely(!p))
159                         goto out_err_free_deviceid;
160 
161                 mp_count = be32_to_cpup(p); /* multipath count */
162                 for (j = 0; j < mp_count; j++) {
163                         da = nfs4_decode_mp_ds_addr(server->nfs_client->cl_net,
164                                                     &stream, gfp_flags);
165                         if (da)
166                                 list_add_tail(&da->da_node, &dsaddrs);
167                 }
168                 if (list_empty(&dsaddrs)) {
169                         dprintk("%s: no suitable DS addresses found\n",
170                                 __func__);
171                         goto out_err_free_deviceid;
172                 }
173 
174                 dsaddr->ds_list[i] = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);
175                 if (!dsaddr->ds_list[i])
176                         goto out_err_drain_dsaddrs;
177 
178                 /* If DS was already in cache, free ds addrs */
179                 while (!list_empty(&dsaddrs)) {
180                         da = list_first_entry(&dsaddrs,
181                                               struct nfs4_pnfs_ds_addr,
182                                               da_node);
183                         list_del_init(&da->da_node);
184                         kfree(da->da_remotestr);
185                         kfree(da);
186                 }
187         }
188 
189         __free_page(scratch);
190         return dsaddr;
191 
192 out_err_drain_dsaddrs:
193         while (!list_empty(&dsaddrs)) {
194                 da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr,
195                                       da_node);
196                 list_del_init(&da->da_node);
197                 kfree(da->da_remotestr);
198                 kfree(da);
199         }
200 out_err_free_deviceid:
201         nfs4_fl_free_deviceid(dsaddr);
202         /* stripe_indicies was part of dsaddr */
203         goto out_err_free_scratch;
204 out_err_free_stripe_indices:
205         kfree(stripe_indices);
206 out_err_free_scratch:
207         __free_page(scratch);
208 out_err:
209         dprintk("%s ERROR: returning NULL\n", __func__);
210         return NULL;
211 }
212 
213 void
214 nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
215 {
216         nfs4_put_deviceid_node(&dsaddr->id_node);
217 }
218 
219 /*
220  * Want res = (offset - layout->pattern_offset)/ layout->stripe_unit
221  * Then: ((res + fsi) % dsaddr->stripe_count)
222  */
223 u32
224 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset)
225 {
226         struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
227         u64 tmp;
228 
229         tmp = offset - flseg->pattern_offset;
230         do_div(tmp, flseg->stripe_unit);
231         tmp += flseg->first_stripe_index;
232         return do_div(tmp, flseg->dsaddr->stripe_count);
233 }
234 
235 u32
236 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j)
237 {
238         return FILELAYOUT_LSEG(lseg)->dsaddr->stripe_indices[j];
239 }
240 
241 struct nfs_fh *
242 nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j)
243 {
244         struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
245         u32 i;
246 
247         if (flseg->stripe_type == STRIPE_SPARSE) {
248                 if (flseg->num_fh == 1)
249                         i = 0;
250                 else if (flseg->num_fh == 0)
251                         /* Use the MDS OPEN fh set in nfs_read_rpcsetup */
252                         return NULL;
253                 else
254                         i = nfs4_fl_calc_ds_index(lseg, j);
255         } else
256                 i = j;
257         return flseg->fh_array[i];
258 }
259 
260 /* Upon return, either ds is connected, or ds is NULL */
261 struct nfs4_pnfs_ds *
262 nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx)
263 {
264         struct nfs4_file_layout_dsaddr *dsaddr = FILELAYOUT_LSEG(lseg)->dsaddr;
265         struct nfs4_pnfs_ds *ds = dsaddr->ds_list[ds_idx];
266         struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg);
267         struct nfs4_pnfs_ds *ret = ds;
268         struct nfs_server *s = NFS_SERVER(lseg->pls_layout->plh_inode);
269 
270         if (ds == NULL) {
271                 printk(KERN_ERR "NFS: %s: No data server for offset index %d\n",
272                         __func__, ds_idx);
273                 pnfs_generic_mark_devid_invalid(devid);
274                 goto out;
275         }
276         smp_rmb();
277         if (ds->ds_clp)
278                 goto out_test_devid;
279 
280         nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo,
281                              dataserver_retrans, 4,
282                              s->nfs_client->cl_minorversion,
283                              s->nfs_client->cl_rpcclient->cl_auth->au_flavor);
284 
285 out_test_devid:
286         if (filelayout_test_devid_unavailable(devid))
287                 ret = NULL;
288 out:
289         return ret;
290 }
291 
292 module_param(dataserver_retrans, uint, 0644);
293 MODULE_PARM_DESC(dataserver_retrans, "The  number of times the NFSv4.1 client "
294                         "retries a request before it attempts further "
295                         " recovery  action.");
296 module_param(dataserver_timeo, uint, 0644);
297 MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the "
298                         "NFSv4.1  client  waits for a response from a "
299                         " data server before it retries an NFS request.");
300 

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