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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
3d14c5d2 | 2 | #include <linux/ceph/ceph_debug.h> |
a8e63b7d SW |
3 | |
4 | #include <linux/exportfs.h> | |
5a0e3ad6 | 5 | #include <linux/slab.h> |
a8e63b7d SW |
6 | #include <asm/unaligned.h> |
7 | ||
8 | #include "super.h" | |
3d14c5d2 | 9 | #include "mds_client.h" |
a8e63b7d | 10 | |
a8e63b7d SW |
11 | /* |
12 | * Basic fh | |
13 | */ | |
14 | struct ceph_nfs_fh { | |
15 | u64 ino; | |
16 | } __attribute__ ((packed)); | |
17 | ||
18 | /* | |
4f32b42d | 19 | * Larger fh that includes parent ino. |
a8e63b7d SW |
20 | */ |
21 | struct ceph_nfs_confh { | |
22 | u64 ino, parent_ino; | |
a8e63b7d SW |
23 | } __attribute__ ((packed)); |
24 | ||
c862868b SW |
25 | static int ceph_encode_fh(struct inode *inode, u32 *rawfh, int *max_len, |
26 | struct inode *parent_inode) | |
a8e63b7d | 27 | { |
92923dcb | 28 | int type; |
a8e63b7d SW |
29 | struct ceph_nfs_fh *fh = (void *)rawfh; |
30 | struct ceph_nfs_confh *cfh = (void *)rawfh; | |
92923dcb AK |
31 | int connected_handle_length = sizeof(*cfh)/4; |
32 | int handle_length = sizeof(*fh)/4; | |
a8e63b7d SW |
33 | |
34 | /* don't re-export snaps */ | |
35 | if (ceph_snap(inode) != CEPH_NOSNAP) | |
36 | return -EINVAL; | |
37 | ||
4f32b42d YZ |
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 | } | |
f6af75da | 45 | |
4f32b42d YZ |
46 | if (parent_inode) { |
47 | dout("encode_fh %llx with parent %llx\n", | |
48 | ceph_ino(inode), ceph_ino(parent_inode)); | |
c862868b | 49 | cfh->ino = ceph_ino(inode); |
4f32b42d | 50 | cfh->parent_ino = ceph_ino(parent_inode); |
92923dcb | 51 | *max_len = connected_handle_length; |
4f32b42d | 52 | type = FILEID_INO32_GEN_PARENT; |
a8e63b7d | 53 | } else { |
4f32b42d YZ |
54 | dout("encode_fh %llx\n", ceph_ino(inode)); |
55 | fh->ino = ceph_ino(inode); | |
bba0cd0e | 56 | *max_len = handle_length; |
4f32b42d | 57 | type = FILEID_INO32_GEN; |
a8e63b7d SW |
58 | } |
59 | return type; | |
60 | } | |
61 | ||
4f32b42d | 62 | static struct dentry *__fh_to_dentry(struct super_block *sb, u64 ino) |
a8e63b7d | 63 | { |
3c454cf2 | 64 | struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc; |
a8e63b7d | 65 | struct inode *inode; |
a8e63b7d SW |
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); | |
03f21904 LH |
95 | if (inode->i_nlink == 0) { |
96 | iput(inode); | |
97 | return ERR_PTR(-ESTALE); | |
98 | } | |
3c454cf2 | 99 | } |
a8e63b7d | 100 | |
ad5cb123 | 101 | return d_obtain_alias(inode); |
a8e63b7d SW |
102 | } |
103 | ||
104 | /* | |
4f32b42d | 105 | * convert regular fh to dentry |
a8e63b7d | 106 | */ |
4f32b42d YZ |
107 | static struct dentry *ceph_fh_to_dentry(struct super_block *sb, |
108 | struct fid *fid, | |
109 | int fh_len, int fh_type) | |
a8e63b7d | 110 | { |
4f32b42d | 111 | struct ceph_nfs_fh *fh = (void *)fid->raw; |
a8e63b7d | 112 | |
4f32b42d YZ |
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; | |
a8e63b7d | 118 | |
4f32b42d YZ |
119 | dout("fh_to_dentry %llx\n", fh->ino); |
120 | return __fh_to_dentry(sb, fh->ino); | |
a8e63b7d SW |
121 | } |
122 | ||
9017c2ec YZ |
123 | static 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; | |
315f2408 | 129 | int mask; |
9017c2ec YZ |
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) { | |
2b0143b5 DH |
138 | req->r_inode = d_inode(child); |
139 | ihold(d_inode(child)); | |
9017c2ec YZ |
140 | } else { |
141 | req->r_ino1 = (struct ceph_vino) { | |
142 | .ino = ino, | |
143 | .snap = CEPH_NOSNAP, | |
144 | }; | |
145 | } | |
315f2408 YZ |
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 | ||
9017c2ec YZ |
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 | ||
ad5cb123 | 161 | return d_obtain_alias(inode); |
9017c2ec YZ |
162 | } |
163 | ||
e84be11c | 164 | static struct dentry *ceph_get_parent(struct dentry *child) |
9017c2ec YZ |
165 | { |
166 | /* don't re-export snaps */ | |
2b0143b5 | 167 | if (ceph_snap(d_inode(child)) != CEPH_NOSNAP) |
9017c2ec YZ |
168 | return ERR_PTR(-EINVAL); |
169 | ||
170 | dout("get_parent %p ino %llx.%llx\n", | |
2b0143b5 | 171 | child, ceph_vinop(d_inode(child))); |
9017c2ec YZ |
172 | return __get_parent(child->d_sb, child, 0); |
173 | } | |
174 | ||
a8e63b7d | 175 | /* |
8996f4f2 | 176 | * convert regular fh to parent |
a8e63b7d SW |
177 | */ |
178 | static struct dentry *ceph_fh_to_parent(struct super_block *sb, | |
8996f4f2 | 179 | struct fid *fid, |
a8e63b7d SW |
180 | int fh_len, int fh_type) |
181 | { | |
182 | struct ceph_nfs_confh *cfh = (void *)fid->raw; | |
a8e63b7d | 183 | struct dentry *dentry; |
a8e63b7d | 184 | |
8996f4f2 YZ |
185 | if (fh_type != FILEID_INO32_GEN_PARENT) |
186 | return NULL; | |
35c2a7f4 | 187 | if (fh_len < sizeof(*cfh) / 4) |
8996f4f2 | 188 | return NULL; |
a8e63b7d | 189 | |
8996f4f2 YZ |
190 | dout("fh_to_parent %llx\n", cfh->parent_ino); |
191 | dentry = __get_parent(sb, NULL, cfh->ino); | |
b42b90d1 | 192 | if (unlikely(dentry == ERR_PTR(-ENOENT))) |
8996f4f2 | 193 | dentry = __fh_to_dentry(sb, cfh->parent_ino); |
a8e63b7d SW |
194 | return dentry; |
195 | } | |
196 | ||
19913b4e YZ |
197 | static 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 | ||
2b0143b5 | 204 | mdsc = ceph_inode_to_client(d_inode(child))->mdsc; |
19913b4e YZ |
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 | ||
5955102c | 210 | inode_lock(d_inode(parent)); |
19913b4e | 211 | |
2b0143b5 DH |
212 | req->r_inode = d_inode(child); |
213 | ihold(d_inode(child)); | |
214 | req->r_ino2 = ceph_vino(d_inode(parent)); | |
3dd69aab JL |
215 | req->r_parent = d_inode(parent); |
216 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
19913b4e YZ |
217 | req->r_num_caps = 2; |
218 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
219 | ||
5955102c | 220 | inode_unlock(d_inode(parent)); |
19913b4e YZ |
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", | |
2b0143b5 | 227 | child, ceph_vinop(d_inode(child)), name); |
19913b4e YZ |
228 | } else { |
229 | dout("get_name %p ino %llx.%llx err %d\n", | |
2b0143b5 | 230 | child, ceph_vinop(d_inode(child)), err); |
19913b4e YZ |
231 | } |
232 | ||
233 | ceph_mdsc_put_request(req); | |
234 | return err; | |
235 | } | |
236 | ||
a8e63b7d SW |
237 | const 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, | |
9017c2ec | 241 | .get_parent = ceph_get_parent, |
19913b4e | 242 | .get_name = ceph_get_name, |
a8e63b7d | 243 | }; |