]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * GPL HEADER START | |
3 | * | |
4 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 only, | |
8 | * as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License version 2 for more details (a copy is included | |
14 | * in the LICENSE file that accompanied this code). | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * version 2 along with this program; If not, see | |
18 | * http://www.gnu.org/licenses/gpl-2.0.html | |
19 | * | |
20 | * GPL HEADER END | |
21 | */ | |
22 | /* | |
23 | * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. | |
24 | * Use is subject to license terms. | |
25 | * | |
26 | * Copyright (c) 2011, 2012, Intel Corporation. | |
27 | */ | |
28 | /* | |
29 | * This file is part of Lustre, http://www.lustre.org/ | |
30 | * Lustre is a trademark of Sun Microsystems, Inc. | |
31 | * | |
32 | * lustre/lustre/llite/llite_nfs.c | |
33 | * | |
34 | * NFS export of Lustre Light File System | |
35 | * | |
36 | * Author: Yury Umanets <umka@clusterfs.com> | |
37 | * Author: Huang Hua <huanghua@clusterfs.com> | |
38 | */ | |
39 | ||
40 | #define DEBUG_SUBSYSTEM S_LLITE | |
41 | #include "../include/lustre_lite.h" | |
42 | #include "llite_internal.h" | |
43 | #include <linux/exportfs.h> | |
44 | ||
45 | __u32 get_uuid2int(const char *name, int len) | |
46 | { | |
47 | __u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9; | |
48 | ||
49 | while (len--) { | |
50 | __u32 key = key1 + (key0 ^ (*name++ * 7152373)); | |
51 | ||
52 | if (key & 0x80000000) | |
53 | key -= 0x7fffffff; | |
54 | key1 = key0; | |
55 | key0 = key; | |
56 | } | |
57 | return (key0 << 1); | |
58 | } | |
59 | ||
60 | void get_uuid2fsid(const char *name, int len, __kernel_fsid_t *fsid) | |
61 | { | |
62 | __u64 key = 0, key0 = 0x12a3fe2d, key1 = 0x37abe8f9; | |
63 | ||
64 | while (len--) { | |
65 | key = key1 + (key0 ^ (*name++ * 7152373)); | |
66 | if (key & 0x8000000000000000ULL) | |
67 | key -= 0x7fffffffffffffffULL; | |
68 | key1 = key0; | |
69 | key0 = key; | |
70 | } | |
71 | ||
72 | fsid->val[0] = key; | |
73 | fsid->val[1] = key >> 32; | |
74 | } | |
75 | ||
76 | static int ll_nfs_test_inode(struct inode *inode, void *opaque) | |
77 | { | |
78 | return lu_fid_eq(&ll_i2info(inode)->lli_fid, opaque); | |
79 | } | |
80 | ||
81 | struct inode *search_inode_for_lustre(struct super_block *sb, | |
82 | const struct lu_fid *fid) | |
83 | { | |
84 | struct ll_sb_info *sbi = ll_s2sbi(sb); | |
85 | struct ptlrpc_request *req = NULL; | |
86 | struct inode *inode = NULL; | |
87 | int eadatalen = 0; | |
88 | unsigned long hash = cl_fid_build_ino(fid, | |
89 | ll_need_32bit_api(sbi)); | |
90 | struct md_op_data *op_data; | |
91 | int rc; | |
92 | ||
93 | CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid)); | |
94 | ||
95 | inode = ilookup5(sb, hash, ll_nfs_test_inode, (void *)fid); | |
96 | if (inode) | |
97 | return inode; | |
98 | ||
99 | rc = ll_get_default_mdsize(sbi, &eadatalen); | |
100 | if (rc) | |
101 | return ERR_PTR(rc); | |
102 | ||
103 | /* Because inode is NULL, ll_prep_md_op_data can not | |
104 | * be used here. So we allocate op_data ourselves | |
105 | */ | |
106 | op_data = kzalloc(sizeof(*op_data), GFP_NOFS); | |
107 | if (!op_data) | |
108 | return ERR_PTR(-ENOMEM); | |
109 | ||
110 | op_data->op_fid1 = *fid; | |
111 | op_data->op_mode = eadatalen; | |
112 | op_data->op_valid = OBD_MD_FLEASIZE; | |
113 | ||
114 | /* mds_fid2dentry ignores f_type */ | |
115 | rc = md_getattr(sbi->ll_md_exp, op_data, &req); | |
116 | kfree(op_data); | |
117 | if (rc) { | |
118 | CDEBUG(D_INFO, "can't get object attrs, fid "DFID", rc %d\n", | |
119 | PFID(fid), rc); | |
120 | return ERR_PTR(rc); | |
121 | } | |
122 | rc = ll_prep_inode(&inode, req, sb, NULL); | |
123 | ptlrpc_req_finished(req); | |
124 | if (rc) | |
125 | return ERR_PTR(rc); | |
126 | ||
127 | return inode; | |
128 | } | |
129 | ||
130 | struct lustre_nfs_fid { | |
131 | struct lu_fid lnf_child; | |
132 | struct lu_fid lnf_parent; | |
133 | }; | |
134 | ||
135 | static struct dentry * | |
136 | ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent) | |
137 | { | |
138 | struct inode *inode; | |
139 | struct dentry *result; | |
140 | ||
141 | if (!fid_is_sane(fid)) | |
142 | return ERR_PTR(-ESTALE); | |
143 | ||
144 | CDEBUG(D_INFO, "Get dentry for fid: " DFID "\n", PFID(fid)); | |
145 | ||
146 | inode = search_inode_for_lustre(sb, fid); | |
147 | if (IS_ERR(inode)) | |
148 | return ERR_CAST(inode); | |
149 | ||
150 | if (is_bad_inode(inode)) { | |
151 | /* we didn't find the right inode.. */ | |
152 | iput(inode); | |
153 | return ERR_PTR(-ESTALE); | |
154 | } | |
155 | ||
156 | /** | |
157 | * It is an anonymous dentry without OST objects created yet. | |
158 | * We have to find the parent to tell MDS how to init lov objects. | |
159 | */ | |
160 | if (S_ISREG(inode->i_mode) && !ll_i2info(inode)->lli_has_smd && | |
161 | parent && !fid_is_zero(parent)) { | |
162 | struct ll_inode_info *lli = ll_i2info(inode); | |
163 | ||
164 | spin_lock(&lli->lli_lock); | |
165 | lli->lli_pfid = *parent; | |
166 | spin_unlock(&lli->lli_lock); | |
167 | } | |
168 | ||
169 | /* N.B. d_obtain_alias() drops inode ref on error */ | |
170 | result = d_obtain_alias(inode); | |
171 | ||
172 | return result; | |
173 | } | |
174 | ||
175 | /** | |
176 | * \a connectable - is nfsd will connect himself or this should be done | |
177 | * at lustre | |
178 | * | |
179 | * The return value is file handle type: | |
180 | * 1 -- contains child file handle; | |
181 | * 2 -- contains child file handle and parent file handle; | |
182 | * 255 -- error. | |
183 | */ | |
184 | static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen, | |
185 | struct inode *parent) | |
186 | { | |
187 | int fileid_len = sizeof(struct lustre_nfs_fid) / 4; | |
188 | struct lustre_nfs_fid *nfs_fid = (void *)fh; | |
189 | ||
190 | CDEBUG(D_INFO, "%s: encoding for ("DFID") maxlen=%d minlen=%d\n", | |
191 | ll_get_fsname(inode->i_sb, NULL, 0), | |
192 | PFID(ll_inode2fid(inode)), *plen, fileid_len); | |
193 | ||
194 | if (*plen < fileid_len) { | |
195 | *plen = fileid_len; | |
196 | return FILEID_INVALID; | |
197 | } | |
198 | ||
199 | nfs_fid->lnf_child = *ll_inode2fid(inode); | |
200 | if (parent) | |
201 | nfs_fid->lnf_parent = *ll_inode2fid(parent); | |
202 | else | |
203 | fid_zero(&nfs_fid->lnf_parent); | |
204 | *plen = fileid_len; | |
205 | ||
206 | return FILEID_LUSTRE; | |
207 | } | |
208 | ||
209 | static int ll_nfs_get_name_filldir(struct dir_context *ctx, const char *name, | |
210 | int namelen, loff_t hash, u64 ino, | |
211 | unsigned type) | |
212 | { | |
213 | /* It is hack to access lde_fid for comparison with lgd_fid. | |
214 | * So the input 'name' must be part of the 'lu_dirent'. | |
215 | */ | |
216 | struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name); | |
217 | struct ll_getname_data *lgd = | |
218 | container_of(ctx, struct ll_getname_data, ctx); | |
219 | struct lu_fid fid; | |
220 | ||
221 | fid_le_to_cpu(&fid, &lde->lde_fid); | |
222 | if (lu_fid_eq(&fid, &lgd->lgd_fid)) { | |
223 | memcpy(lgd->lgd_name, name, namelen); | |
224 | lgd->lgd_name[namelen] = 0; | |
225 | lgd->lgd_found = 1; | |
226 | } | |
227 | return lgd->lgd_found; | |
228 | } | |
229 | ||
230 | static int ll_get_name(struct dentry *dentry, char *name, | |
231 | struct dentry *child) | |
232 | { | |
233 | struct inode *dir = d_inode(dentry); | |
234 | int rc; | |
235 | struct ll_getname_data lgd = { | |
236 | .lgd_name = name, | |
237 | .lgd_fid = ll_i2info(d_inode(child))->lli_fid, | |
238 | .ctx.actor = ll_nfs_get_name_filldir, | |
239 | }; | |
240 | ||
241 | if (!dir || !S_ISDIR(dir->i_mode)) { | |
242 | rc = -ENOTDIR; | |
243 | goto out; | |
244 | } | |
245 | ||
246 | if (!dir->i_fop) { | |
247 | rc = -EINVAL; | |
248 | goto out; | |
249 | } | |
250 | ||
251 | inode_lock(dir); | |
252 | rc = ll_dir_read(dir, &lgd.ctx); | |
253 | inode_unlock(dir); | |
254 | if (!rc && !lgd.lgd_found) | |
255 | rc = -ENOENT; | |
256 | out: | |
257 | return rc; | |
258 | } | |
259 | ||
260 | static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
261 | int fh_len, int fh_type) | |
262 | { | |
263 | struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid; | |
264 | ||
265 | if (fh_type != FILEID_LUSTRE) | |
266 | return ERR_PTR(-EPROTO); | |
267 | ||
268 | return ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent); | |
269 | } | |
270 | ||
271 | static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid, | |
272 | int fh_len, int fh_type) | |
273 | { | |
274 | struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid; | |
275 | ||
276 | if (fh_type != FILEID_LUSTRE) | |
277 | return ERR_PTR(-EPROTO); | |
278 | ||
279 | return ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL); | |
280 | } | |
281 | ||
282 | static struct dentry *ll_get_parent(struct dentry *dchild) | |
283 | { | |
284 | struct ptlrpc_request *req = NULL; | |
285 | struct inode *dir = d_inode(dchild); | |
286 | struct ll_sb_info *sbi; | |
287 | struct dentry *result = NULL; | |
288 | struct mdt_body *body; | |
289 | static char dotdot[] = ".."; | |
290 | struct md_op_data *op_data; | |
291 | int rc; | |
292 | int lmmsize; | |
293 | ||
294 | LASSERT(dir && S_ISDIR(dir->i_mode)); | |
295 | ||
296 | sbi = ll_s2sbi(dir->i_sb); | |
297 | ||
298 | CDEBUG(D_INFO, "%s: getting parent for ("DFID")\n", | |
299 | ll_get_fsname(dir->i_sb, NULL, 0), | |
300 | PFID(ll_inode2fid(dir))); | |
301 | ||
302 | rc = ll_get_default_mdsize(sbi, &lmmsize); | |
303 | if (rc != 0) | |
304 | return ERR_PTR(rc); | |
305 | ||
306 | op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot, | |
307 | strlen(dotdot), lmmsize, | |
308 | LUSTRE_OPC_ANY, NULL); | |
309 | if (IS_ERR(op_data)) | |
310 | return (void *)op_data; | |
311 | ||
312 | rc = md_getattr_name(sbi->ll_md_exp, op_data, &req); | |
313 | ll_finish_md_op_data(op_data); | |
314 | if (rc) { | |
315 | CERROR("%s: failure inode "DFID" get parent: rc = %d\n", | |
316 | ll_get_fsname(dir->i_sb, NULL, 0), | |
317 | PFID(ll_inode2fid(dir)), rc); | |
318 | return ERR_PTR(rc); | |
319 | } | |
320 | body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY); | |
321 | /* | |
322 | * LU-3952: MDT may lost the FID of its parent, we should not crash | |
323 | * the NFS server, ll_iget_for_nfs() will handle the error. | |
324 | */ | |
325 | if (body->valid & OBD_MD_FLID) { | |
326 | CDEBUG(D_INFO, "parent for " DFID " is " DFID "\n", | |
327 | PFID(ll_inode2fid(dir)), PFID(&body->fid1)); | |
328 | } | |
329 | result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL); | |
330 | ||
331 | ptlrpc_req_finished(req); | |
332 | return result; | |
333 | } | |
334 | ||
335 | const struct export_operations lustre_export_operations = { | |
336 | .get_parent = ll_get_parent, | |
337 | .encode_fh = ll_encode_fh, | |
338 | .get_name = ll_get_name, | |
339 | .fh_to_dentry = ll_fh_to_dentry, | |
340 | .fh_to_parent = ll_fh_to_parent, | |
341 | }; |