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
nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr * dsaddr)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_rcu(dsaddr, id_node.rcu);
59 }
60
61 /* Decode opaque device data and return the result */
62 struct nfs4_file_layout_dsaddr *
nfs4_fl_alloc_deviceid_node(struct nfs_server * server,struct pnfs_device * pdev,gfp_t gfp_flags)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_page(&stream, scratch);
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
nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr * dsaddr)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
nfs4_fl_calc_j_index(struct pnfs_layout_segment * lseg,loff_t offset)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
nfs4_fl_calc_ds_index(struct pnfs_layout_segment * lseg,u32 j)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 *
nfs4_fl_select_ds_fh(struct pnfs_layout_segment * lseg,u32 j)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 *
nfs4_fl_prepare_ds(struct pnfs_layout_segment * lseg,u32 ds_idx)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 int status;
270
271 if (ds == NULL) {
272 printk(KERN_ERR "NFS: %s: No data server for offset index %d\n",
273 __func__, ds_idx);
274 pnfs_generic_mark_devid_invalid(devid);
275 goto out;
276 }
277 smp_rmb();
278 if (ds->ds_clp)
279 goto out_test_devid;
280
281 status = nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo,
282 dataserver_retrans, 4,
283 s->nfs_client->cl_minorversion);
284 if (status) {
285 nfs4_mark_deviceid_unavailable(devid);
286 ret = NULL;
287 goto out;
288 }
289
290 out_test_devid:
291 if (ret->ds_clp == NULL ||
292 filelayout_test_devid_unavailable(devid))
293 ret = NULL;
294 out:
295 return ret;
296 }
297
298 module_param(dataserver_retrans, uint, 0644);
299 MODULE_PARM_DESC(dataserver_retrans, "The number of times the NFSv4.1 client "
300 "retries a request before it attempts further "
301 " recovery action.");
302 module_param(dataserver_timeo, uint, 0644);
303 MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the "
304 "NFSv4.1 client waits for a response from a "
305 " data server before it retries an NFS request.");
306