Commit | Line | Data |
---|---|---|
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; | |
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); | |
45e3d3ee SW |
83 | inode = req->r_target_inode; |
84 | if (inode) | |
70b666c3 | 85 | ihold(inode); |
3c454cf2 | 86 | ceph_mdsc_put_request(req); |
3c454cf2 SW |
87 | if (!inode) |
88 | return ERR_PTR(-ESTALE); | |
89 | } | |
a8e63b7d SW |
90 | |
91 | dentry = d_obtain_alias(inode); | |
0d509c94 | 92 | if (IS_ERR(dentry)) { |
a8e63b7d | 93 | iput(inode); |
0d509c94 | 94 | return dentry; |
a8e63b7d SW |
95 | } |
96 | err = ceph_init_dentry(dentry); | |
a8e63b7d | 97 | if (err < 0) { |
4f32b42d | 98 | dput(dentry); |
a8e63b7d SW |
99 | return ERR_PTR(err); |
100 | } | |
4f32b42d | 101 | dout("__fh_to_dentry %llx %p dentry %p\n", ino, inode, dentry); |
a8e63b7d SW |
102 | return dentry; |
103 | } | |
104 | ||
105 | /* | |
4f32b42d | 106 | * convert regular fh to dentry |
a8e63b7d | 107 | */ |
4f32b42d YZ |
108 | static struct dentry *ceph_fh_to_dentry(struct super_block *sb, |
109 | struct fid *fid, | |
110 | int fh_len, int fh_type) | |
a8e63b7d | 111 | { |
4f32b42d | 112 | struct ceph_nfs_fh *fh = (void *)fid->raw; |
a8e63b7d | 113 | |
4f32b42d YZ |
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; | |
a8e63b7d | 119 | |
4f32b42d YZ |
120 | dout("fh_to_dentry %llx\n", fh->ino); |
121 | return __fh_to_dentry(sb, fh->ino); | |
a8e63b7d SW |
122 | } |
123 | ||
9017c2ec YZ |
124 | static 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 | ||
e84be11c | 172 | static struct dentry *ceph_get_parent(struct dentry *child) |
9017c2ec YZ |
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 | ||
a8e63b7d | 183 | /* |
8996f4f2 | 184 | * convert regular fh to parent |
a8e63b7d SW |
185 | */ |
186 | static struct dentry *ceph_fh_to_parent(struct super_block *sb, | |
8996f4f2 | 187 | struct fid *fid, |
a8e63b7d SW |
188 | int fh_len, int fh_type) |
189 | { | |
190 | struct ceph_nfs_confh *cfh = (void *)fid->raw; | |
a8e63b7d | 191 | struct dentry *dentry; |
a8e63b7d | 192 | |
8996f4f2 YZ |
193 | if (fh_type != FILEID_INO32_GEN_PARENT) |
194 | return NULL; | |
35c2a7f4 | 195 | if (fh_len < sizeof(*cfh) / 4) |
8996f4f2 | 196 | return NULL; |
a8e63b7d | 197 | |
8996f4f2 YZ |
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); | |
a8e63b7d SW |
202 | return dentry; |
203 | } | |
204 | ||
19913b4e YZ |
205 | static 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 | ||
a8e63b7d SW |
244 | const 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, | |
9017c2ec | 248 | .get_parent = ceph_get_parent, |
19913b4e | 249 | .get_name = ceph_get_name, |
a8e63b7d | 250 | }; |