Commit | Line | Data |
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d7e09d03 PT |
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.sun.com/software/products/lustre/docs/GPLv2.pdf | |
19 | * | |
20 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
21 | * CA 95054 USA or visit www.sun.com if you need additional information or | |
22 | * have any questions. | |
23 | * | |
24 | * GPL HEADER END | |
25 | */ | |
26 | /* | |
27 | * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. | |
28 | * Use is subject to license terms. | |
29 | * | |
30 | * Copyright (c) 2011, 2012, Intel Corporation. | |
31 | */ | |
32 | /* | |
33 | * This file is part of Lustre, http://www.lustre.org/ | |
34 | * Lustre is a trademark of Sun Microsystems, Inc. | |
35 | * | |
36 | * lustre/lustre/llite/llite_nfs.c | |
37 | * | |
38 | * NFS export of Lustre Light File System | |
39 | * | |
40 | * Author: Yury Umanets <umka@clusterfs.com> | |
41 | * Author: Huang Hua <huanghua@clusterfs.com> | |
42 | */ | |
43 | ||
44 | #define DEBUG_SUBSYSTEM S_LLITE | |
67a235f5 | 45 | #include "../include/lustre_lite.h" |
d7e09d03 PT |
46 | #include "llite_internal.h" |
47 | #include <linux/exportfs.h> | |
48 | ||
49 | __u32 get_uuid2int(const char *name, int len) | |
50 | { | |
51 | __u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9; | |
50ffcb7e | 52 | |
d7e09d03 PT |
53 | while (len--) { |
54 | __u32 key = key1 + (key0 ^ (*name++ * 7152373)); | |
5b39bd5f JP |
55 | |
56 | if (key & 0x80000000) | |
57 | key -= 0x7fffffff; | |
d7e09d03 PT |
58 | key1 = key0; |
59 | key0 = key; | |
60 | } | |
61 | return (key0 << 1); | |
62 | } | |
63 | ||
bd994071 FY |
64 | void get_uuid2fsid(const char *name, int len, __kernel_fsid_t *fsid) |
65 | { | |
66 | __u64 key = 0, key0 = 0x12a3fe2d, key1 = 0x37abe8f9; | |
67 | ||
68 | while (len--) { | |
69 | key = key1 + (key0 ^ (*name++ * 7152373)); | |
70 | if (key & 0x8000000000000000ULL) | |
71 | key -= 0x7fffffffffffffffULL; | |
72 | key1 = key0; | |
73 | key0 = key; | |
74 | } | |
75 | ||
76 | fsid->val[0] = key; | |
77 | fsid->val[1] = key >> 32; | |
78 | } | |
79 | ||
d7e09d03 PT |
80 | static int ll_nfs_test_inode(struct inode *inode, void *opaque) |
81 | { | |
3e127cbb | 82 | return lu_fid_eq(&ll_i2info(inode)->lli_fid, opaque); |
d7e09d03 PT |
83 | } |
84 | ||
85 | struct inode *search_inode_for_lustre(struct super_block *sb, | |
86 | const struct lu_fid *fid) | |
87 | { | |
88 | struct ll_sb_info *sbi = ll_s2sbi(sb); | |
89 | struct ptlrpc_request *req = NULL; | |
90 | struct inode *inode = NULL; | |
91 | int eadatalen = 0; | |
92 | unsigned long hash = cl_fid_build_ino(fid, | |
93 | ll_need_32bit_api(sbi)); | |
94 | struct md_op_data *op_data; | |
95 | int rc; | |
d7e09d03 PT |
96 | |
97 | CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid)); | |
98 | ||
99 | inode = ilookup5(sb, hash, ll_nfs_test_inode, (void *)fid); | |
100 | if (inode) | |
0a3bdb00 | 101 | return inode; |
d7e09d03 | 102 | |
44779340 | 103 | rc = ll_get_default_mdsize(sbi, &eadatalen); |
d7e09d03 | 104 | if (rc) |
0a3bdb00 | 105 | return ERR_PTR(rc); |
d7e09d03 PT |
106 | |
107 | /* Because inode is NULL, ll_prep_md_op_data can not | |
108 | * be used here. So we allocate op_data ourselves */ | |
496a51bd JL |
109 | op_data = kzalloc(sizeof(*op_data), GFP_NOFS); |
110 | if (!op_data) | |
d7e09d03 PT |
111 | return ERR_PTR(-ENOMEM); |
112 | ||
113 | op_data->op_fid1 = *fid; | |
114 | op_data->op_mode = eadatalen; | |
115 | op_data->op_valid = OBD_MD_FLEASIZE; | |
116 | ||
117 | /* mds_fid2dentry ignores f_type */ | |
118 | rc = md_getattr(sbi->ll_md_exp, op_data, &req); | |
97903a26 | 119 | kfree(op_data); |
d7e09d03 PT |
120 | if (rc) { |
121 | CERROR("can't get object attrs, fid "DFID", rc %d\n", | |
122 | PFID(fid), rc); | |
0a3bdb00 | 123 | return ERR_PTR(rc); |
d7e09d03 PT |
124 | } |
125 | rc = ll_prep_inode(&inode, req, sb, NULL); | |
126 | ptlrpc_req_finished(req); | |
127 | if (rc) | |
0a3bdb00 | 128 | return ERR_PTR(rc); |
d7e09d03 | 129 | |
0a3bdb00 | 130 | return inode; |
d7e09d03 PT |
131 | } |
132 | ||
133 | struct lustre_nfs_fid { | |
134 | struct lu_fid lnf_child; | |
135 | struct lu_fid lnf_parent; | |
136 | }; | |
137 | ||
138 | static struct dentry * | |
139 | ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent) | |
140 | { | |
141 | struct inode *inode; | |
142 | struct dentry *result; | |
d7e09d03 PT |
143 | |
144 | CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid)); | |
145 | if (!fid_is_sane(fid)) | |
0a3bdb00 | 146 | return ERR_PTR(-ESTALE); |
d7e09d03 PT |
147 | |
148 | inode = search_inode_for_lustre(sb, fid); | |
149 | if (IS_ERR(inode)) | |
0a3bdb00 | 150 | return ERR_CAST(inode); |
d7e09d03 PT |
151 | |
152 | if (is_bad_inode(inode)) { | |
153 | /* we didn't find the right inode.. */ | |
154 | iput(inode); | |
0a3bdb00 | 155 | return ERR_PTR(-ESTALE); |
d7e09d03 PT |
156 | } |
157 | ||
158 | /** | |
159 | * It is an anonymous dentry without OST objects created yet. | |
160 | * We have to find the parent to tell MDS how to init lov objects. | |
161 | */ | |
162 | if (S_ISREG(inode->i_mode) && !ll_i2info(inode)->lli_has_smd && | |
163 | parent != NULL) { | |
164 | struct ll_inode_info *lli = ll_i2info(inode); | |
165 | ||
166 | spin_lock(&lli->lli_lock); | |
167 | lli->lli_pfid = *parent; | |
168 | spin_unlock(&lli->lli_lock); | |
169 | } | |
170 | ||
7f830d8d | 171 | /* N.B. d_obtain_alias() drops inode ref on error */ |
d7e09d03 | 172 | result = d_obtain_alias(inode); |
d7e09d03 | 173 | |
0a3bdb00 | 174 | return result; |
d7e09d03 PT |
175 | } |
176 | ||
177 | #define LUSTRE_NFS_FID 0x97 | |
178 | ||
179 | /** | |
180 | * \a connectable - is nfsd will connect himself or this should be done | |
181 | * at lustre | |
182 | * | |
183 | * The return value is file handle type: | |
184 | * 1 -- contains child file handle; | |
185 | * 2 -- contains child file handle and parent file handle; | |
186 | * 255 -- error. | |
187 | */ | |
188 | static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen, | |
189 | struct inode *parent) | |
190 | { | |
191 | struct lustre_nfs_fid *nfs_fid = (void *)fh; | |
d7e09d03 PT |
192 | |
193 | CDEBUG(D_INFO, "encoding for (%lu,"DFID") maxlen=%d minlen=%d\n", | |
194 | inode->i_ino, PFID(ll_inode2fid(inode)), *plen, | |
195 | (int)sizeof(struct lustre_nfs_fid)); | |
196 | ||
197 | if (*plen < sizeof(struct lustre_nfs_fid) / 4) | |
0a3bdb00 | 198 | return 255; |
d7e09d03 PT |
199 | |
200 | nfs_fid->lnf_child = *ll_inode2fid(inode); | |
201 | nfs_fid->lnf_parent = *ll_inode2fid(parent); | |
202 | *plen = sizeof(struct lustre_nfs_fid) / 4; | |
203 | ||
0a3bdb00 | 204 | return LUSTRE_NFS_FID; |
d7e09d03 PT |
205 | } |
206 | ||
ac7576f4 MS |
207 | static int ll_nfs_get_name_filldir(struct dir_context *ctx, const char *name, |
208 | int namelen, loff_t hash, u64 ino, | |
209 | unsigned type) | |
d7e09d03 PT |
210 | { |
211 | /* It is hack to access lde_fid for comparison with lgd_fid. | |
212 | * So the input 'name' must be part of the 'lu_dirent'. */ | |
213 | struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name); | |
ac7576f4 MS |
214 | struct ll_getname_data *lgd = |
215 | container_of(ctx, struct ll_getname_data, ctx); | |
d7e09d03 PT |
216 | struct lu_fid fid; |
217 | ||
218 | fid_le_to_cpu(&fid, &lde->lde_fid); | |
219 | if (lu_fid_eq(&fid, &lgd->lgd_fid)) { | |
220 | memcpy(lgd->lgd_name, name, namelen); | |
221 | lgd->lgd_name[namelen] = 0; | |
222 | lgd->lgd_found = 1; | |
223 | } | |
224 | return lgd->lgd_found; | |
225 | } | |
226 | ||
227 | static int ll_get_name(struct dentry *dentry, char *name, | |
228 | struct dentry *child) | |
229 | { | |
2b0143b5 | 230 | struct inode *dir = d_inode(dentry); |
d7e09d03 | 231 | int rc; |
0b09d381 PT |
232 | struct ll_getname_data lgd = { |
233 | .lgd_name = name, | |
2b0143b5 | 234 | .lgd_fid = ll_i2info(d_inode(child))->lli_fid, |
0b09d381 PT |
235 | .ctx.actor = ll_nfs_get_name_filldir, |
236 | }; | |
d7e09d03 | 237 | |
34e1f2bb JL |
238 | if (!dir || !S_ISDIR(dir->i_mode)) { |
239 | rc = -ENOTDIR; | |
240 | goto out; | |
241 | } | |
d7e09d03 | 242 | |
34e1f2bb JL |
243 | if (!dir->i_fop) { |
244 | rc = -EINVAL; | |
245 | goto out; | |
246 | } | |
d7e09d03 | 247 | |
5955102c | 248 | inode_lock(dir); |
0b09d381 | 249 | rc = ll_dir_read(dir, &lgd.ctx); |
5955102c | 250 | inode_unlock(dir); |
d7e09d03 PT |
251 | if (!rc && !lgd.lgd_found) |
252 | rc = -ENOENT; | |
d7e09d03 PT |
253 | out: |
254 | return rc; | |
255 | } | |
256 | ||
257 | static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
258 | int fh_len, int fh_type) | |
259 | { | |
260 | struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid; | |
261 | ||
262 | if (fh_type != LUSTRE_NFS_FID) | |
0a3bdb00 | 263 | return ERR_PTR(-EPROTO); |
d7e09d03 | 264 | |
0a3bdb00 | 265 | return ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent); |
d7e09d03 PT |
266 | } |
267 | ||
268 | static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid, | |
269 | int fh_len, int fh_type) | |
270 | { | |
271 | struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid; | |
272 | ||
273 | if (fh_type != LUSTRE_NFS_FID) | |
0a3bdb00 | 274 | return ERR_PTR(-EPROTO); |
d7e09d03 | 275 | |
0a3bdb00 | 276 | return ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL); |
d7e09d03 PT |
277 | } |
278 | ||
279 | static struct dentry *ll_get_parent(struct dentry *dchild) | |
280 | { | |
281 | struct ptlrpc_request *req = NULL; | |
2b0143b5 | 282 | struct inode *dir = d_inode(dchild); |
d7e09d03 PT |
283 | struct ll_sb_info *sbi; |
284 | struct dentry *result = NULL; | |
285 | struct mdt_body *body; | |
286 | static char dotdot[] = ".."; | |
287 | struct md_op_data *op_data; | |
288 | int rc; | |
289 | int lmmsize; | |
d7e09d03 PT |
290 | |
291 | LASSERT(dir && S_ISDIR(dir->i_mode)); | |
292 | ||
293 | sbi = ll_s2sbi(dir->i_sb); | |
294 | ||
295 | CDEBUG(D_INFO, "getting parent for (%lu,"DFID")\n", | |
296 | dir->i_ino, PFID(ll_inode2fid(dir))); | |
297 | ||
44779340 | 298 | rc = ll_get_default_mdsize(sbi, &lmmsize); |
d7e09d03 | 299 | if (rc != 0) |
0a3bdb00 | 300 | return ERR_PTR(rc); |
d7e09d03 PT |
301 | |
302 | op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot, | |
303 | strlen(dotdot), lmmsize, | |
304 | LUSTRE_OPC_ANY, NULL); | |
305 | if (IS_ERR(op_data)) | |
0a3bdb00 | 306 | return (void *)op_data; |
d7e09d03 PT |
307 | |
308 | rc = md_getattr_name(sbi->ll_md_exp, op_data, &req); | |
309 | ll_finish_md_op_data(op_data); | |
310 | if (rc) { | |
311 | CERROR("failure %d inode %lu get parent\n", rc, dir->i_ino); | |
0a3bdb00 | 312 | return ERR_PTR(rc); |
d7e09d03 PT |
313 | } |
314 | body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY); | |
315 | LASSERT(body->valid & OBD_MD_FLID); | |
316 | ||
317 | CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n", | |
318 | PFID(ll_inode2fid(dir)), PFID(&body->fid1)); | |
319 | ||
320 | result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL); | |
321 | ||
322 | ptlrpc_req_finished(req); | |
0a3bdb00 | 323 | return result; |
d7e09d03 PT |
324 | } |
325 | ||
326 | struct export_operations lustre_export_operations = { | |
327 | .get_parent = ll_get_parent, | |
328 | .encode_fh = ll_encode_fh, | |
329 | .get_name = ll_get_name, | |
330 | .fh_to_dentry = ll_fh_to_dentry, | |
331 | .fh_to_parent = ll_fh_to_parent, | |
332 | }; |