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 return dentry; 100 err = ceph_init_dentry(dentry); 101 if (err < 0) { 102 dput(dentry); 103 return ERR_PTR(err); 104 } 105 dout("__fh_to_dentry %llx %p dentry %p\n", ino, inode, dentry); 106 return dentry; 107 } 108 109 /* 110 * convert regular fh to dentry 111 */ 112 static struct dentry *ceph_fh_to_dentry(struct super_block *sb, 113 struct fid *fid, 114 int fh_len, int fh_type) 115 { 116 struct ceph_nfs_fh *fh = (void *)fid->raw; 117 118 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; 123 124 dout("fh_to_dentry %llx\n", fh->ino); 125 return __fh_to_dentry(sb, fh->ino); 126 } 127 128 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; 135 int mask; 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) { 144 req->r_inode = d_inode(child); 145 ihold(d_inode(child)); 146 } else { 147 req->r_ino1 = (struct ceph_vino) { 148 .ino = ino, 149 .snap = CEPH_NOSNAP, 150 }; 151 } 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); 157 158 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); 168 if (IS_ERR(dentry)) 169 return dentry; 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", 176 child ? ceph_ino(d_inode(child)) : ino, 177 dentry, ceph_vinop(inode)); 178 return dentry; 179 } 180 181 static struct dentry *ceph_get_parent(struct dentry *child) 182 { 183 /* don't re-export snaps */ 184 if (ceph_snap(d_inode(child)) != CEPH_NOSNAP) 185 return ERR_PTR(-EINVAL); 186 187 dout("get_parent %p ino %llx.%llx\n", 188 child, ceph_vinop(d_inode(child))); 189 return __get_parent(child->d_sb, child, 0); 190 } 191 192 /* 193 * convert regular fh to parent 194 */ 195 static struct dentry *ceph_fh_to_parent(struct super_block *sb, 196 struct fid *fid, 197 int fh_len, int fh_type) 198 { 199 struct ceph_nfs_confh *cfh = (void *)fid->raw; 200 struct dentry *dentry; 201 202 if (fh_type != FILEID_INO32_GEN_PARENT) 203 return NULL; 204 if (fh_len < sizeof(*cfh) / 4) 205 return NULL; 206 207 dout("fh_to_parent %llx\n", cfh->parent_ino); 208 dentry = __get_parent(sb, NULL, cfh->ino); 209 if (unlikely(dentry == ERR_PTR(-ENOENT))) 210 dentry = __fh_to_dentry(sb, cfh->parent_ino); 211 return dentry; 212 } 213 214 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; 220 221 mdsc = ceph_inode_to_client(d_inode(child))->mdsc; 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); 226 227 inode_lock(d_inode(parent)); 228 229 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); 233 req->r_num_caps = 2; 234 err = ceph_mdsc_do_request(mdsc, NULL, req); 235 236 inode_unlock(d_inode(parent)); 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", 243 child, ceph_vinop(d_inode(child)), name); 244 } else { 245 dout("get_name %p ino %llx.%llx err %d\n", 246 child, ceph_vinop(d_inode(child)), err); 247 } 248 249 ceph_mdsc_put_request(req); 250 return err; 251 } 252 253 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, 257 .get_parent = ceph_get_parent, 258 .get_name = ceph_get_name, 259 }; 260