2 * Device operations for the pnfs nfs4 file layout driver.
5 * The Regents of the University of Michigan
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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
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31 #include <linux/nfs_fs.h>
32 #include <linux/vmalloc.h>
33 #include <linux/module.h>
35 #include "../internal.h"
36 #include "../nfs4session.h"
37 #include "filelayout.h"
38 #include "../nfs4trace.h"
40 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
42 static unsigned int dataserver_timeo = NFS4_DEF_DS_TIMEO;
43 static unsigned int dataserver_retrans = NFS4_DEF_DS_RETRANS;
46 nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
48 struct nfs4_pnfs_ds *ds;
51 nfs4_print_deviceid(&dsaddr->id_node.deviceid);
53 for (i = 0; i < dsaddr->ds_num; i++) {
54 ds = dsaddr->ds_list[i];
58 kfree(dsaddr->stripe_indices);
59 kfree_rcu(dsaddr, id_node.rcu);
62 /* Decode opaque device data and return the result */
63 struct nfs4_file_layout_dsaddr *
64 nfs4_fl_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
73 struct nfs4_file_layout_dsaddr *dsaddr = NULL;
74 struct xdr_stream stream;
77 struct list_head dsaddrs;
78 struct nfs4_pnfs_ds_addr *da;
80 /* set up xdr stream */
81 scratch = alloc_page(gfp_flags);
85 xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen);
86 xdr_set_scratch_page(&stream, scratch);
88 /* Get the stripe count (number of stripe index) */
89 p = xdr_inline_decode(&stream, 4);
91 goto out_err_free_scratch;
93 cnt = be32_to_cpup(p);
94 dprintk("%s stripe count %d\n", __func__, cnt);
95 if (cnt > NFS4_PNFS_MAX_STRIPE_CNT) {
96 printk(KERN_WARNING "NFS: %s: stripe count %d greater than "
97 "supported maximum %d\n", __func__,
98 cnt, NFS4_PNFS_MAX_STRIPE_CNT);
99 goto out_err_free_scratch;
102 /* read stripe indices */
103 stripe_indices = kcalloc(cnt, sizeof(u8), gfp_flags);
105 goto out_err_free_scratch;
107 p = xdr_inline_decode(&stream, cnt << 2);
109 goto out_err_free_stripe_indices;
111 indexp = &stripe_indices[0];
112 max_stripe_index = 0;
113 for (i = 0; i < cnt; i++) {
114 *indexp = be32_to_cpup(p++);
115 max_stripe_index = max(max_stripe_index, *indexp);
119 /* Check the multipath list count */
120 p = xdr_inline_decode(&stream, 4);
122 goto out_err_free_stripe_indices;
124 num = be32_to_cpup(p);
125 dprintk("%s ds_num %u\n", __func__, num);
126 if (num > NFS4_PNFS_MAX_MULTI_CNT) {
127 printk(KERN_WARNING "NFS: %s: multipath count %d greater than "
128 "supported maximum %d\n", __func__,
129 num, NFS4_PNFS_MAX_MULTI_CNT);
130 goto out_err_free_stripe_indices;
133 /* validate stripe indices are all < num */
134 if (max_stripe_index >= num) {
135 printk(KERN_WARNING "NFS: %s: stripe index %u >= num ds %u\n",
136 __func__, max_stripe_index, num);
137 goto out_err_free_stripe_indices;
140 dsaddr = kzalloc(struct_size(dsaddr, ds_list, num), gfp_flags);
142 goto out_err_free_stripe_indices;
144 dsaddr->stripe_count = cnt;
145 dsaddr->stripe_indices = stripe_indices;
146 stripe_indices = NULL;
147 dsaddr->ds_num = num;
148 nfs4_init_deviceid_node(&dsaddr->id_node, server, &pdev->dev_id);
150 INIT_LIST_HEAD(&dsaddrs);
152 for (i = 0; i < dsaddr->ds_num; i++) {
156 p = xdr_inline_decode(&stream, 4);
158 goto out_err_free_deviceid;
160 mp_count = be32_to_cpup(p); /* multipath count */
161 for (j = 0; j < mp_count; j++) {
162 da = nfs4_decode_mp_ds_addr(server->nfs_client->cl_net,
165 list_add_tail(&da->da_node, &dsaddrs);
167 if (list_empty(&dsaddrs)) {
168 dprintk("%s: no suitable DS addresses found\n",
170 goto out_err_free_deviceid;
173 dsaddr->ds_list[i] = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);
174 if (!dsaddr->ds_list[i])
175 goto out_err_drain_dsaddrs;
176 trace_fl_getdevinfo(server, &pdev->dev_id, dsaddr->ds_list[i]->ds_remotestr);
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,
183 list_del_init(&da->da_node);
184 kfree(da->da_remotestr);
189 __free_page(scratch);
192 out_err_drain_dsaddrs:
193 while (!list_empty(&dsaddrs)) {
194 da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr,
196 list_del_init(&da->da_node);
197 kfree(da->da_remotestr);
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);
209 dprintk("%s ERROR: returning NULL\n", __func__);
214 nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
216 nfs4_put_deviceid_node(&dsaddr->id_node);
220 * Want res = (offset - layout->pattern_offset)/ layout->stripe_unit
221 * Then: ((res + fsi) % dsaddr->stripe_count)
224 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset)
226 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
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);
236 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j)
238 return FILELAYOUT_LSEG(lseg)->dsaddr->stripe_indices[j];
242 nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j)
244 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
247 if (flseg->stripe_type == STRIPE_SPARSE) {
248 if (flseg->num_fh == 1)
250 else if (flseg->num_fh == 0)
251 /* Use the MDS OPEN fh set in nfs_read_rpcsetup */
254 i = nfs4_fl_calc_ds_index(lseg, j);
257 return flseg->fh_array[i];
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)
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);
272 printk(KERN_ERR "NFS: %s: No data server for offset index %d\n",
274 pnfs_generic_mark_devid_invalid(devid);
281 status = nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo,
282 dataserver_retrans, 4,
283 s->nfs_client->cl_minorversion);
285 nfs4_mark_deviceid_unavailable(devid);
291 if (ret->ds_clp == NULL ||
292 filelayout_test_devid_unavailable(devid))
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.");