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 */ 13 struct ceph_nfs_fh { 14 u64 ino; 15 } __attribute__ ((packed)); 16 17 /* 18 * Larger fh that includes parent ino. 19 */ 20 struct ceph_nfs_confh { 21 u64 ino, parent_ino; 22 } __attribute__ ((packed)); 23 24 static 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 61 static 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 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 } 96 97 dentry = d_obtain_alias(inode); 98 if (IS_ERR(dentry)) { 99 iput(inode); 100 return dentry; 101 } 102 err = ceph_init_dentry(dentry); 103 if (err < 0) { 104 dput(dentry); 105 return ERR_PTR(err); 106 } 107 dout("__fh_to_dentry %llx %p dentry %p\n", ino, inode, dentry); 108 return dentry; 109 } 110 111 /* 112 * convert regular fh to dentry 113 */ 114 static struct dentry *ceph_fh_to_dentry(struct super_block *sb, 115 struct fid *fid, 116 int fh_len, int fh_type) 117 { 118 struct ceph_nfs_fh *fh = (void *)fid->raw; 119 120 if (fh_type != FILEID_INO32_GEN && 121 fh_type != FILEID_INO32_GEN_PARENT) 122 return NULL; 123 if (fh_len < sizeof(*fh) / 4) 124 return NULL; 125 126 dout("fh_to_dentry %llx\n", fh->ino); 127 return __fh_to_dentry(sb, fh->ino); 128 } 129 130 static struct dentry *__get_parent(struct super_block *sb, 131 struct dentry *child, u64 ino) 132 { 133 struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc; 134 struct ceph_mds_request *req; 135 struct inode *inode; 136 struct dentry *dentry; 137 int mask; 138 int err; 139 140 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT, 141 USE_ANY_MDS); 142 if (IS_ERR(req)) 143 return ERR_CAST(req); 144 145 if (child) { 146 req->r_inode = d_inode(child); 147 ihold(d_inode(child)); 148 } else { 149 req->r_ino1 = (struct ceph_vino) { 150 .ino = ino, 151 .snap = CEPH_NOSNAP, 152 }; 153 } 154 155 mask = CEPH_STAT_CAP_INODE; 156 if (ceph_security_xattr_wanted(d_inode(sb->s_root))) 157 mask |= CEPH_CAP_XATTR_SHARED; 158 req->r_args.getattr.mask = cpu_to_le32(mask); 159 160 req->r_num_caps = 1; 161 err = ceph_mdsc_do_request(mdsc, NULL, req); 162 inode = req->r_target_inode; 163 if (inode) 164 ihold(inode); 165 ceph_mdsc_put_request(req); 166 if (!inode) 167 return ERR_PTR(-ENOENT); 168 169 dentry = d_obtain_alias(inode); 170 if (IS_ERR(dentry)) { 171 iput(inode); 172 return dentry; 173 } 174 err = ceph_init_dentry(dentry); 175 if (err < 0) { 176 dput(dentry); 177 return ERR_PTR(err); 178 } 179 dout("__get_parent ino %llx parent %p ino %llx.%llx\n", 180 child ? ceph_ino(d_inode(child)) : ino, 181 dentry, ceph_vinop(inode)); 182 return dentry; 183 } 184 185 static struct dentry *ceph_get_parent(struct dentry *child) 186 { 187 /* don't re-export snaps */ 188 if (ceph_snap(d_inode(child)) != CEPH_NOSNAP) 189 return ERR_PTR(-EINVAL); 190 191 dout("get_parent %p ino %llx.%llx\n", 192 child, ceph_vinop(d_inode(child))); 193 return __get_parent(child->d_sb, child, 0); 194 } 195 196 /* 197 * convert regular fh to parent 198 */ 199 static struct dentry *ceph_fh_to_parent(struct super_block *sb, 200 struct fid *fid, 201 int fh_len, int fh_type) 202 { 203 struct ceph_nfs_confh *cfh = (void *)fid->raw; 204 struct dentry *dentry; 205 206 if (fh_type != FILEID_INO32_GEN_PARENT) 207 return NULL; 208 if (fh_len < sizeof(*cfh) / 4) 209 return NULL; 210 211 dout("fh_to_parent %llx\n", cfh->parent_ino); 212 dentry = __get_parent(sb, NULL, cfh->ino); 213 if (IS_ERR(dentry) && PTR_ERR(dentry) == -ENOENT) 214 dentry = __fh_to_dentry(sb, cfh->parent_ino); 215 return dentry; 216 } 217 218 static int ceph_get_name(struct dentry *parent, char *name, 219 struct dentry *child) 220 { 221 struct ceph_mds_client *mdsc; 222 struct ceph_mds_request *req; 223 int err; 224 225 mdsc = ceph_inode_to_client(d_inode(child))->mdsc; 226 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME, 227 USE_ANY_MDS); 228 if (IS_ERR(req)) 229 return PTR_ERR(req); 230 231 inode_lock(d_inode(parent)); 232 233 req->r_inode = d_inode(child); 234 ihold(d_inode(child)); 235 req->r_ino2 = ceph_vino(d_inode(parent)); 236 req->r_locked_dir = d_inode(parent); 237 req->r_num_caps = 2; 238 err = ceph_mdsc_do_request(mdsc, NULL, req); 239 240 inode_unlock(d_inode(parent)); 241 242 if (!err) { 243 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 244 memcpy(name, rinfo->dname, rinfo->dname_len); 245 name[rinfo->dname_len] = 0; 246 dout("get_name %p ino %llx.%llx name %s\n", 247 child, ceph_vinop(d_inode(child)), name); 248 } else { 249 dout("get_name %p ino %llx.%llx err %d\n", 250 child, ceph_vinop(d_inode(child)), err); 251 } 252 253 ceph_mdsc_put_request(req); 254 return err; 255 } 256 257 const struct export_operations ceph_export_ops = { 258 .encode_fh = ceph_encode_fh, 259 .fh_to_dentry = ceph_fh_to_dentry, 260 .fh_to_parent = ceph_fh_to_parent, 261 .get_parent = ceph_get_parent, 262 .get_name = ceph_get_name, 263 }; 264