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1#include <linux/ceph/ceph_debug.h>
2
3#include <linux/exportfs.h>
4#include <linux/slab.h>
5#include <asm/unaligned.h>
6
7#include "super.h"
8#include "mds_client.h"
9
10/*
11 * Basic fh
12 */
13struct ceph_nfs_fh {
14 u64 ino;
15} __attribute__ ((packed));
16
17/*
18 * Larger fh that includes parent ino.
19 */
20struct ceph_nfs_confh {
21 u64 ino, parent_ino;
22} __attribute__ ((packed));
23
24static int ceph_encode_fh(struct inode *inode, u32 *rawfh, int *max_len,
25 struct inode *parent_inode)
26{
27 int type;
28 struct ceph_nfs_fh *fh = (void *)rawfh;
29 struct ceph_nfs_confh *cfh = (void *)rawfh;
30 int connected_handle_length = sizeof(*cfh)/4;
31 int handle_length = sizeof(*fh)/4;
32
33 /* don't re-export snaps */
34 if (ceph_snap(inode) != CEPH_NOSNAP)
35 return -EINVAL;
36
37 if (parent_inode && (*max_len < connected_handle_length)) {
38 *max_len = connected_handle_length;
39 return FILEID_INVALID;
40 } else if (*max_len < handle_length) {
41 *max_len = handle_length;
42 return FILEID_INVALID;
43 }
44
45 if (parent_inode) {
46 dout("encode_fh %llx with parent %llx\n",
47 ceph_ino(inode), ceph_ino(parent_inode));
48 cfh->ino = ceph_ino(inode);
49 cfh->parent_ino = ceph_ino(parent_inode);
50 *max_len = connected_handle_length;
51 type = FILEID_INO32_GEN_PARENT;
52 } else {
53 dout("encode_fh %llx\n", ceph_ino(inode));
54 fh->ino = ceph_ino(inode);
55 *max_len = handle_length;
56 type = FILEID_INO32_GEN;
57 }
58 return type;
59}
60
61static struct dentry *__fh_to_dentry(struct super_block *sb, u64 ino)
62{
63 struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
64 struct inode *inode;
65 struct dentry *dentry;
66 struct ceph_vino vino;
67 int err;
68
69 vino.ino = ino;
70 vino.snap = CEPH_NOSNAP;
71 inode = ceph_find_inode(sb, vino);
72 if (!inode) {
73 struct ceph_mds_request *req;
74
75 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO,
76 USE_ANY_MDS);
77 if (IS_ERR(req))
78 return ERR_CAST(req);
79
80 req->r_ino1 = vino;
81 req->r_num_caps = 1;
82 err = ceph_mdsc_do_request(mdsc, NULL, req);
83 inode = req->r_target_inode;
84 if (inode)
85 ihold(inode);
86 ceph_mdsc_put_request(req);
87 if (!inode)
88 return ERR_PTR(-ESTALE);
89 }
90
91 dentry = d_obtain_alias(inode);
92 if (IS_ERR(dentry)) {
93 iput(inode);
94 return dentry;
95 }
96 err = ceph_init_dentry(dentry);
97 if (err < 0) {
98 dput(dentry);
99 return ERR_PTR(err);
100 }
101 dout("__fh_to_dentry %llx %p dentry %p\n", ino, inode, dentry);
102 return dentry;
103}
104
105/*
106 * convert regular fh to dentry
107 */
108static struct dentry *ceph_fh_to_dentry(struct super_block *sb,
109 struct fid *fid,
110 int fh_len, int fh_type)
111{
112 struct ceph_nfs_fh *fh = (void *)fid->raw;
113
114 if (fh_type != FILEID_INO32_GEN &&
115 fh_type != FILEID_INO32_GEN_PARENT)
116 return NULL;
117 if (fh_len < sizeof(*fh) / 4)
118 return NULL;
119
120 dout("fh_to_dentry %llx\n", fh->ino);
121 return __fh_to_dentry(sb, fh->ino);
122}
123
124static struct dentry *__get_parent(struct super_block *sb,
125 struct dentry *child, u64 ino)
126{
127 struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
128 struct ceph_mds_request *req;
129 struct inode *inode;
130 struct dentry *dentry;
131 int err;
132
133 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT,
134 USE_ANY_MDS);
135 if (IS_ERR(req))
136 return ERR_CAST(req);
137
138 if (child) {
139 req->r_inode = child->d_inode;
140 ihold(child->d_inode);
141 } else {
142 req->r_ino1 = (struct ceph_vino) {
143 .ino = ino,
144 .snap = CEPH_NOSNAP,
145 };
146 }
147 req->r_num_caps = 1;
148 err = ceph_mdsc_do_request(mdsc, NULL, req);
149 inode = req->r_target_inode;
150 if (inode)
151 ihold(inode);
152 ceph_mdsc_put_request(req);
153 if (!inode)
154 return ERR_PTR(-ENOENT);
155
156 dentry = d_obtain_alias(inode);
157 if (IS_ERR(dentry)) {
158 iput(inode);
159 return dentry;
160 }
161 err = ceph_init_dentry(dentry);
162 if (err < 0) {
163 dput(dentry);
164 return ERR_PTR(err);
165 }
166 dout("__get_parent ino %llx parent %p ino %llx.%llx\n",
167 child ? ceph_ino(child->d_inode) : ino,
168 dentry, ceph_vinop(inode));
169 return dentry;
170}
171
172struct dentry *ceph_get_parent(struct dentry *child)
173{
174 /* don't re-export snaps */
175 if (ceph_snap(child->d_inode) != CEPH_NOSNAP)
176 return ERR_PTR(-EINVAL);
177
178 dout("get_parent %p ino %llx.%llx\n",
179 child, ceph_vinop(child->d_inode));
180 return __get_parent(child->d_sb, child, 0);
181}
182
183/*
184 * convert regular fh to parent
185 */
186static struct dentry *ceph_fh_to_parent(struct super_block *sb,
187 struct fid *fid,
188 int fh_len, int fh_type)
189{
190 struct ceph_nfs_confh *cfh = (void *)fid->raw;
191 struct dentry *dentry;
192
193 if (fh_type != FILEID_INO32_GEN_PARENT)
194 return NULL;
195 if (fh_len < sizeof(*cfh) / 4)
196 return NULL;
197
198 dout("fh_to_parent %llx\n", cfh->parent_ino);
199 dentry = __get_parent(sb, NULL, cfh->ino);
200 if (IS_ERR(dentry) && PTR_ERR(dentry) == -ENOENT)
201 dentry = __fh_to_dentry(sb, cfh->parent_ino);
202 return dentry;
203}
204
205static int ceph_get_name(struct dentry *parent, char *name,
206 struct dentry *child)
207{
208 struct ceph_mds_client *mdsc;
209 struct ceph_mds_request *req;
210 int err;
211
212 mdsc = ceph_inode_to_client(child->d_inode)->mdsc;
213 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME,
214 USE_ANY_MDS);
215 if (IS_ERR(req))
216 return PTR_ERR(req);
217
218 mutex_lock(&parent->d_inode->i_mutex);
219
220 req->r_inode = child->d_inode;
221 ihold(child->d_inode);
222 req->r_ino2 = ceph_vino(parent->d_inode);
223 req->r_locked_dir = parent->d_inode;
224 req->r_num_caps = 2;
225 err = ceph_mdsc_do_request(mdsc, NULL, req);
226
227 mutex_unlock(&parent->d_inode->i_mutex);
228
229 if (!err) {
230 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
231 memcpy(name, rinfo->dname, rinfo->dname_len);
232 name[rinfo->dname_len] = 0;
233 dout("get_name %p ino %llx.%llx name %s\n",
234 child, ceph_vinop(child->d_inode), name);
235 } else {
236 dout("get_name %p ino %llx.%llx err %d\n",
237 child, ceph_vinop(child->d_inode), err);
238 }
239
240 ceph_mdsc_put_request(req);
241 return err;
242}
243
244const struct export_operations ceph_export_ops = {
245 .encode_fh = ceph_encode_fh,
246 .fh_to_dentry = ceph_fh_to_dentry,
247 .fh_to_parent = ceph_fh_to_parent,
248 .get_parent = ceph_get_parent,
249 .get_name = ceph_get_name,
250};
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/ceph/ceph_debug.h>
3
4#include <linux/exportfs.h>
5#include <linux/slab.h>
6#include <asm/unaligned.h>
7
8#include "super.h"
9#include "mds_client.h"
10
11/*
12 * Basic fh
13 */
14struct ceph_nfs_fh {
15 u64 ino;
16} __attribute__ ((packed));
17
18/*
19 * Larger fh that includes parent ino.
20 */
21struct ceph_nfs_confh {
22 u64 ino, parent_ino;
23} __attribute__ ((packed));
24
25static int ceph_encode_fh(struct inode *inode, u32 *rawfh, int *max_len,
26 struct inode *parent_inode)
27{
28 int type;
29 struct ceph_nfs_fh *fh = (void *)rawfh;
30 struct ceph_nfs_confh *cfh = (void *)rawfh;
31 int connected_handle_length = sizeof(*cfh)/4;
32 int handle_length = sizeof(*fh)/4;
33
34 /* don't re-export snaps */
35 if (ceph_snap(inode) != CEPH_NOSNAP)
36 return -EINVAL;
37
38 if (parent_inode && (*max_len < connected_handle_length)) {
39 *max_len = connected_handle_length;
40 return FILEID_INVALID;
41 } else if (*max_len < handle_length) {
42 *max_len = handle_length;
43 return FILEID_INVALID;
44 }
45
46 if (parent_inode) {
47 dout("encode_fh %llx with parent %llx\n",
48 ceph_ino(inode), ceph_ino(parent_inode));
49 cfh->ino = ceph_ino(inode);
50 cfh->parent_ino = ceph_ino(parent_inode);
51 *max_len = connected_handle_length;
52 type = FILEID_INO32_GEN_PARENT;
53 } else {
54 dout("encode_fh %llx\n", ceph_ino(inode));
55 fh->ino = ceph_ino(inode);
56 *max_len = handle_length;
57 type = FILEID_INO32_GEN;
58 }
59 return type;
60}
61
62static struct dentry *__fh_to_dentry(struct super_block *sb, u64 ino)
63{
64 struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
65 struct inode *inode;
66 struct ceph_vino vino;
67 int err;
68
69 vino.ino = ino;
70 vino.snap = CEPH_NOSNAP;
71 inode = ceph_find_inode(sb, vino);
72 if (!inode) {
73 struct ceph_mds_request *req;
74 int mask;
75
76 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO,
77 USE_ANY_MDS);
78 if (IS_ERR(req))
79 return ERR_CAST(req);
80
81 mask = CEPH_STAT_CAP_INODE;
82 if (ceph_security_xattr_wanted(d_inode(sb->s_root)))
83 mask |= CEPH_CAP_XATTR_SHARED;
84 req->r_args.getattr.mask = cpu_to_le32(mask);
85
86 req->r_ino1 = vino;
87 req->r_num_caps = 1;
88 err = ceph_mdsc_do_request(mdsc, NULL, req);
89 inode = req->r_target_inode;
90 if (inode)
91 ihold(inode);
92 ceph_mdsc_put_request(req);
93 if (!inode)
94 return ERR_PTR(-ESTALE);
95 if (inode->i_nlink == 0) {
96 iput(inode);
97 return ERR_PTR(-ESTALE);
98 }
99 }
100
101 return d_obtain_alias(inode);
102}
103
104/*
105 * convert regular fh to dentry
106 */
107static struct dentry *ceph_fh_to_dentry(struct super_block *sb,
108 struct fid *fid,
109 int fh_len, int fh_type)
110{
111 struct ceph_nfs_fh *fh = (void *)fid->raw;
112
113 if (fh_type != FILEID_INO32_GEN &&
114 fh_type != FILEID_INO32_GEN_PARENT)
115 return NULL;
116 if (fh_len < sizeof(*fh) / 4)
117 return NULL;
118
119 dout("fh_to_dentry %llx\n", fh->ino);
120 return __fh_to_dentry(sb, fh->ino);
121}
122
123static struct dentry *__get_parent(struct super_block *sb,
124 struct dentry *child, u64 ino)
125{
126 struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
127 struct ceph_mds_request *req;
128 struct inode *inode;
129 int mask;
130 int err;
131
132 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT,
133 USE_ANY_MDS);
134 if (IS_ERR(req))
135 return ERR_CAST(req);
136
137 if (child) {
138 req->r_inode = d_inode(child);
139 ihold(d_inode(child));
140 } else {
141 req->r_ino1 = (struct ceph_vino) {
142 .ino = ino,
143 .snap = CEPH_NOSNAP,
144 };
145 }
146
147 mask = CEPH_STAT_CAP_INODE;
148 if (ceph_security_xattr_wanted(d_inode(sb->s_root)))
149 mask |= CEPH_CAP_XATTR_SHARED;
150 req->r_args.getattr.mask = cpu_to_le32(mask);
151
152 req->r_num_caps = 1;
153 err = ceph_mdsc_do_request(mdsc, NULL, req);
154 inode = req->r_target_inode;
155 if (inode)
156 ihold(inode);
157 ceph_mdsc_put_request(req);
158 if (!inode)
159 return ERR_PTR(-ENOENT);
160
161 return d_obtain_alias(inode);
162}
163
164static struct dentry *ceph_get_parent(struct dentry *child)
165{
166 /* don't re-export snaps */
167 if (ceph_snap(d_inode(child)) != CEPH_NOSNAP)
168 return ERR_PTR(-EINVAL);
169
170 dout("get_parent %p ino %llx.%llx\n",
171 child, ceph_vinop(d_inode(child)));
172 return __get_parent(child->d_sb, child, 0);
173}
174
175/*
176 * convert regular fh to parent
177 */
178static struct dentry *ceph_fh_to_parent(struct super_block *sb,
179 struct fid *fid,
180 int fh_len, int fh_type)
181{
182 struct ceph_nfs_confh *cfh = (void *)fid->raw;
183 struct dentry *dentry;
184
185 if (fh_type != FILEID_INO32_GEN_PARENT)
186 return NULL;
187 if (fh_len < sizeof(*cfh) / 4)
188 return NULL;
189
190 dout("fh_to_parent %llx\n", cfh->parent_ino);
191 dentry = __get_parent(sb, NULL, cfh->ino);
192 if (unlikely(dentry == ERR_PTR(-ENOENT)))
193 dentry = __fh_to_dentry(sb, cfh->parent_ino);
194 return dentry;
195}
196
197static int ceph_get_name(struct dentry *parent, char *name,
198 struct dentry *child)
199{
200 struct ceph_mds_client *mdsc;
201 struct ceph_mds_request *req;
202 int err;
203
204 mdsc = ceph_inode_to_client(d_inode(child))->mdsc;
205 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME,
206 USE_ANY_MDS);
207 if (IS_ERR(req))
208 return PTR_ERR(req);
209
210 inode_lock(d_inode(parent));
211
212 req->r_inode = d_inode(child);
213 ihold(d_inode(child));
214 req->r_ino2 = ceph_vino(d_inode(parent));
215 req->r_parent = d_inode(parent);
216 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
217 req->r_num_caps = 2;
218 err = ceph_mdsc_do_request(mdsc, NULL, req);
219
220 inode_unlock(d_inode(parent));
221
222 if (!err) {
223 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
224 memcpy(name, rinfo->dname, rinfo->dname_len);
225 name[rinfo->dname_len] = 0;
226 dout("get_name %p ino %llx.%llx name %s\n",
227 child, ceph_vinop(d_inode(child)), name);
228 } else {
229 dout("get_name %p ino %llx.%llx err %d\n",
230 child, ceph_vinop(d_inode(child)), err);
231 }
232
233 ceph_mdsc_put_request(req);
234 return err;
235}
236
237const struct export_operations ceph_export_ops = {
238 .encode_fh = ceph_encode_fh,
239 .fh_to_dentry = ceph_fh_to_dentry,
240 .fh_to_parent = ceph_fh_to_parent,
241 .get_parent = ceph_get_parent,
242 .get_name = ceph_get_name,
243};