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Commit | Line | Data |
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3d14c5d2 | 1 | #include <linux/ceph/ceph_debug.h> |
a8e63b7d SW |
2 | |
3 | #include <linux/exportfs.h> | |
5a0e3ad6 | 4 | #include <linux/slab.h> |
a8e63b7d SW |
5 | #include <asm/unaligned.h> |
6 | ||
7 | #include "super.h" | |
3d14c5d2 | 8 | #include "mds_client.h" |
a8e63b7d | 9 | |
a8e63b7d SW |
10 | /* |
11 | * Basic fh | |
12 | */ | |
13 | struct ceph_nfs_fh { | |
14 | u64 ino; | |
15 | } __attribute__ ((packed)); | |
16 | ||
17 | /* | |
4f32b42d | 18 | * Larger fh that includes parent ino. |
a8e63b7d SW |
19 | */ |
20 | struct ceph_nfs_confh { | |
21 | u64 ino, parent_ino; | |
a8e63b7d SW |
22 | } __attribute__ ((packed)); |
23 | ||
c862868b SW |
24 | static int ceph_encode_fh(struct inode *inode, u32 *rawfh, int *max_len, |
25 | struct inode *parent_inode) | |
a8e63b7d | 26 | { |
92923dcb | 27 | int type; |
a8e63b7d SW |
28 | struct ceph_nfs_fh *fh = (void *)rawfh; |
29 | struct ceph_nfs_confh *cfh = (void *)rawfh; | |
92923dcb AK |
30 | int connected_handle_length = sizeof(*cfh)/4; |
31 | int handle_length = sizeof(*fh)/4; | |
a8e63b7d SW |
32 | |
33 | /* don't re-export snaps */ | |
34 | if (ceph_snap(inode) != CEPH_NOSNAP) | |
35 | return -EINVAL; | |
36 | ||
4f32b42d YZ |
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 | } | |
f6af75da | 44 | |
4f32b42d YZ |
45 | if (parent_inode) { |
46 | dout("encode_fh %llx with parent %llx\n", | |
47 | ceph_ino(inode), ceph_ino(parent_inode)); | |
c862868b | 48 | cfh->ino = ceph_ino(inode); |
4f32b42d | 49 | cfh->parent_ino = ceph_ino(parent_inode); |
92923dcb | 50 | *max_len = connected_handle_length; |
4f32b42d | 51 | type = FILEID_INO32_GEN_PARENT; |
a8e63b7d | 52 | } else { |
4f32b42d YZ |
53 | dout("encode_fh %llx\n", ceph_ino(inode)); |
54 | fh->ino = ceph_ino(inode); | |
bba0cd0e | 55 | *max_len = handle_length; |
4f32b42d | 56 | type = FILEID_INO32_GEN; |
a8e63b7d SW |
57 | } |
58 | return type; | |
59 | } | |
60 | ||
4f32b42d | 61 | static struct dentry *__fh_to_dentry(struct super_block *sb, u64 ino) |
a8e63b7d | 62 | { |
3c454cf2 | 63 | struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc; |
a8e63b7d SW |
64 | struct inode *inode; |
65 | struct dentry *dentry; | |
66 | struct ceph_vino vino; | |
67 | int err; | |
68 | ||
4f32b42d | 69 | vino.ino = ino; |
a8e63b7d SW |
70 | vino.snap = CEPH_NOSNAP; |
71 | inode = ceph_find_inode(sb, vino); | |
3c454cf2 SW |
72 | if (!inode) { |
73 | struct ceph_mds_request *req; | |
315f2408 | 74 | int mask; |
3c454cf2 SW |
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 | ||
315f2408 YZ |
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 | ||
3c454cf2 SW |
86 | req->r_ino1 = vino; |
87 | req->r_num_caps = 1; | |
88 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
45e3d3ee SW |
89 | inode = req->r_target_inode; |
90 | if (inode) | |
70b666c3 | 91 | ihold(inode); |
3c454cf2 | 92 | ceph_mdsc_put_request(req); |
3c454cf2 SW |
93 | if (!inode) |
94 | return ERR_PTR(-ESTALE); | |
95 | } | |
a8e63b7d SW |
96 | |
97 | dentry = d_obtain_alias(inode); | |
b42b90d1 | 98 | if (IS_ERR(dentry)) |
0d509c94 | 99 | return dentry; |
a8e63b7d | 100 | err = ceph_init_dentry(dentry); |
a8e63b7d | 101 | if (err < 0) { |
4f32b42d | 102 | dput(dentry); |
a8e63b7d SW |
103 | return ERR_PTR(err); |
104 | } | |
4f32b42d | 105 | dout("__fh_to_dentry %llx %p dentry %p\n", ino, inode, dentry); |
a8e63b7d SW |
106 | return dentry; |
107 | } | |
108 | ||
109 | /* | |
4f32b42d | 110 | * convert regular fh to dentry |
a8e63b7d | 111 | */ |
4f32b42d YZ |
112 | static struct dentry *ceph_fh_to_dentry(struct super_block *sb, |
113 | struct fid *fid, | |
114 | int fh_len, int fh_type) | |
a8e63b7d | 115 | { |
4f32b42d | 116 | struct ceph_nfs_fh *fh = (void *)fid->raw; |
a8e63b7d | 117 | |
4f32b42d YZ |
118 | if (fh_type != FILEID_INO32_GEN && |
119 | fh_type != FILEID_INO32_GEN_PARENT) | |
120 | return NULL; | |
121 | if (fh_len < sizeof(*fh) / 4) | |
122 | return NULL; | |
a8e63b7d | 123 | |
4f32b42d YZ |
124 | dout("fh_to_dentry %llx\n", fh->ino); |
125 | return __fh_to_dentry(sb, fh->ino); | |
a8e63b7d SW |
126 | } |
127 | ||
9017c2ec YZ |
128 | static struct dentry *__get_parent(struct super_block *sb, |
129 | struct dentry *child, u64 ino) | |
130 | { | |
131 | struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc; | |
132 | struct ceph_mds_request *req; | |
133 | struct inode *inode; | |
134 | struct dentry *dentry; | |
315f2408 | 135 | int mask; |
9017c2ec YZ |
136 | int err; |
137 | ||
138 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT, | |
139 | USE_ANY_MDS); | |
140 | if (IS_ERR(req)) | |
141 | return ERR_CAST(req); | |
142 | ||
143 | if (child) { | |
2b0143b5 DH |
144 | req->r_inode = d_inode(child); |
145 | ihold(d_inode(child)); | |
9017c2ec YZ |
146 | } else { |
147 | req->r_ino1 = (struct ceph_vino) { | |
148 | .ino = ino, | |
149 | .snap = CEPH_NOSNAP, | |
150 | }; | |
151 | } | |
315f2408 YZ |
152 | |
153 | mask = CEPH_STAT_CAP_INODE; | |
154 | if (ceph_security_xattr_wanted(d_inode(sb->s_root))) | |
155 | mask |= CEPH_CAP_XATTR_SHARED; | |
156 | req->r_args.getattr.mask = cpu_to_le32(mask); | |
157 | ||
9017c2ec YZ |
158 | req->r_num_caps = 1; |
159 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
160 | inode = req->r_target_inode; | |
161 | if (inode) | |
162 | ihold(inode); | |
163 | ceph_mdsc_put_request(req); | |
164 | if (!inode) | |
165 | return ERR_PTR(-ENOENT); | |
166 | ||
167 | dentry = d_obtain_alias(inode); | |
b42b90d1 | 168 | if (IS_ERR(dentry)) |
9017c2ec | 169 | return dentry; |
9017c2ec YZ |
170 | err = ceph_init_dentry(dentry); |
171 | if (err < 0) { | |
172 | dput(dentry); | |
173 | return ERR_PTR(err); | |
174 | } | |
175 | dout("__get_parent ino %llx parent %p ino %llx.%llx\n", | |
2b0143b5 | 176 | child ? ceph_ino(d_inode(child)) : ino, |
9017c2ec YZ |
177 | dentry, ceph_vinop(inode)); |
178 | return dentry; | |
179 | } | |
180 | ||
e84be11c | 181 | static struct dentry *ceph_get_parent(struct dentry *child) |
9017c2ec YZ |
182 | { |
183 | /* don't re-export snaps */ | |
2b0143b5 | 184 | if (ceph_snap(d_inode(child)) != CEPH_NOSNAP) |
9017c2ec YZ |
185 | return ERR_PTR(-EINVAL); |
186 | ||
187 | dout("get_parent %p ino %llx.%llx\n", | |
2b0143b5 | 188 | child, ceph_vinop(d_inode(child))); |
9017c2ec YZ |
189 | return __get_parent(child->d_sb, child, 0); |
190 | } | |
191 | ||
a8e63b7d | 192 | /* |
8996f4f2 | 193 | * convert regular fh to parent |
a8e63b7d SW |
194 | */ |
195 | static struct dentry *ceph_fh_to_parent(struct super_block *sb, | |
8996f4f2 | 196 | struct fid *fid, |
a8e63b7d SW |
197 | int fh_len, int fh_type) |
198 | { | |
199 | struct ceph_nfs_confh *cfh = (void *)fid->raw; | |
a8e63b7d | 200 | struct dentry *dentry; |
a8e63b7d | 201 | |
8996f4f2 YZ |
202 | if (fh_type != FILEID_INO32_GEN_PARENT) |
203 | return NULL; | |
35c2a7f4 | 204 | if (fh_len < sizeof(*cfh) / 4) |
8996f4f2 | 205 | return NULL; |
a8e63b7d | 206 | |
8996f4f2 YZ |
207 | dout("fh_to_parent %llx\n", cfh->parent_ino); |
208 | dentry = __get_parent(sb, NULL, cfh->ino); | |
b42b90d1 | 209 | if (unlikely(dentry == ERR_PTR(-ENOENT))) |
8996f4f2 | 210 | dentry = __fh_to_dentry(sb, cfh->parent_ino); |
a8e63b7d SW |
211 | return dentry; |
212 | } | |
213 | ||
19913b4e YZ |
214 | static int ceph_get_name(struct dentry *parent, char *name, |
215 | struct dentry *child) | |
216 | { | |
217 | struct ceph_mds_client *mdsc; | |
218 | struct ceph_mds_request *req; | |
219 | int err; | |
220 | ||
2b0143b5 | 221 | mdsc = ceph_inode_to_client(d_inode(child))->mdsc; |
19913b4e YZ |
222 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME, |
223 | USE_ANY_MDS); | |
224 | if (IS_ERR(req)) | |
225 | return PTR_ERR(req); | |
226 | ||
5955102c | 227 | inode_lock(d_inode(parent)); |
19913b4e | 228 | |
2b0143b5 DH |
229 | req->r_inode = d_inode(child); |
230 | ihold(d_inode(child)); | |
231 | req->r_ino2 = ceph_vino(d_inode(parent)); | |
232 | req->r_locked_dir = d_inode(parent); | |
19913b4e YZ |
233 | req->r_num_caps = 2; |
234 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
235 | ||
5955102c | 236 | inode_unlock(d_inode(parent)); |
19913b4e YZ |
237 | |
238 | if (!err) { | |
239 | struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; | |
240 | memcpy(name, rinfo->dname, rinfo->dname_len); | |
241 | name[rinfo->dname_len] = 0; | |
242 | dout("get_name %p ino %llx.%llx name %s\n", | |
2b0143b5 | 243 | child, ceph_vinop(d_inode(child)), name); |
19913b4e YZ |
244 | } else { |
245 | dout("get_name %p ino %llx.%llx err %d\n", | |
2b0143b5 | 246 | child, ceph_vinop(d_inode(child)), err); |
19913b4e YZ |
247 | } |
248 | ||
249 | ceph_mdsc_put_request(req); | |
250 | return err; | |
251 | } | |
252 | ||
a8e63b7d SW |
253 | const struct export_operations ceph_export_ops = { |
254 | .encode_fh = ceph_encode_fh, | |
255 | .fh_to_dentry = ceph_fh_to_dentry, | |
256 | .fh_to_parent = ceph_fh_to_parent, | |
9017c2ec | 257 | .get_parent = ceph_get_parent, |
19913b4e | 258 | .get_name = ceph_get_name, |
a8e63b7d | 259 | }; |