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 ceph_vino vino; 66 int err; 67 68 vino.ino = ino; 69 vino.snap = CEPH_NOSNAP; 70 inode = ceph_find_inode(sb, vino); 71 if (!inode) { 72 struct ceph_mds_request *req; 73 int mask; 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 mask = CEPH_STAT_CAP_INODE; 81 if (ceph_security_xattr_wanted(d_inode(sb->s_root))) 82 mask |= CEPH_CAP_XATTR_SHARED; 83 req->r_args.getattr.mask = cpu_to_le32(mask); 84 85 req->r_ino1 = vino; 86 req->r_num_caps = 1; 87 err = ceph_mdsc_do_request(mdsc, NULL, req); 88 inode = req->r_target_inode; 89 if (inode) 90 ihold(inode); 91 ceph_mdsc_put_request(req); 92 if (!inode) 93 return ERR_PTR(-ESTALE); 94 } 95 96 return d_obtain_alias(inode); 97 } 98 99 /* 100 * convert regular fh to dentry 101 */ 102 static struct dentry *ceph_fh_to_dentry(struct super_block *sb, 103 struct fid *fid, 104 int fh_len, int fh_type) 105 { 106 struct ceph_nfs_fh *fh = (void *)fid->raw; 107 108 if (fh_type != FILEID_INO32_GEN && 109 fh_type != FILEID_INO32_GEN_PARENT) 110 return NULL; 111 if (fh_len < sizeof(*fh) / 4) 112 return NULL; 113 114 dout("fh_to_dentry %llx\n", fh->ino); 115 return __fh_to_dentry(sb, fh->ino); 116 } 117 118 static struct dentry *__get_parent(struct super_block *sb, 119 struct dentry *child, u64 ino) 120 { 121 struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc; 122 struct ceph_mds_request *req; 123 struct inode *inode; 124 int mask; 125 int err; 126 127 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT, 128 USE_ANY_MDS); 129 if (IS_ERR(req)) 130 return ERR_CAST(req); 131 132 if (child) { 133 req->r_inode = d_inode(child); 134 ihold(d_inode(child)); 135 } else { 136 req->r_ino1 = (struct ceph_vino) { 137 .ino = ino, 138 .snap = CEPH_NOSNAP, 139 }; 140 } 141 142 mask = CEPH_STAT_CAP_INODE; 143 if (ceph_security_xattr_wanted(d_inode(sb->s_root))) 144 mask |= CEPH_CAP_XATTR_SHARED; 145 req->r_args.getattr.mask = cpu_to_le32(mask); 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 return d_obtain_alias(inode); 157 } 158 159 static struct dentry *ceph_get_parent(struct dentry *child) 160 { 161 /* don't re-export snaps */ 162 if (ceph_snap(d_inode(child)) != CEPH_NOSNAP) 163 return ERR_PTR(-EINVAL); 164 165 dout("get_parent %p ino %llx.%llx\n", 166 child, ceph_vinop(d_inode(child))); 167 return __get_parent(child->d_sb, child, 0); 168 } 169 170 /* 171 * convert regular fh to parent 172 */ 173 static struct dentry *ceph_fh_to_parent(struct super_block *sb, 174 struct fid *fid, 175 int fh_len, int fh_type) 176 { 177 struct ceph_nfs_confh *cfh = (void *)fid->raw; 178 struct dentry *dentry; 179 180 if (fh_type != FILEID_INO32_GEN_PARENT) 181 return NULL; 182 if (fh_len < sizeof(*cfh) / 4) 183 return NULL; 184 185 dout("fh_to_parent %llx\n", cfh->parent_ino); 186 dentry = __get_parent(sb, NULL, cfh->ino); 187 if (unlikely(dentry == ERR_PTR(-ENOENT))) 188 dentry = __fh_to_dentry(sb, cfh->parent_ino); 189 return dentry; 190 } 191 192 static int ceph_get_name(struct dentry *parent, char *name, 193 struct dentry *child) 194 { 195 struct ceph_mds_client *mdsc; 196 struct ceph_mds_request *req; 197 int err; 198 199 mdsc = ceph_inode_to_client(d_inode(child))->mdsc; 200 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME, 201 USE_ANY_MDS); 202 if (IS_ERR(req)) 203 return PTR_ERR(req); 204 205 inode_lock(d_inode(parent)); 206 207 req->r_inode = d_inode(child); 208 ihold(d_inode(child)); 209 req->r_ino2 = ceph_vino(d_inode(parent)); 210 req->r_parent = d_inode(parent); 211 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); 212 req->r_num_caps = 2; 213 err = ceph_mdsc_do_request(mdsc, NULL, req); 214 215 inode_unlock(d_inode(parent)); 216 217 if (!err) { 218 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 219 memcpy(name, rinfo->dname, rinfo->dname_len); 220 name[rinfo->dname_len] = 0; 221 dout("get_name %p ino %llx.%llx name %s\n", 222 child, ceph_vinop(d_inode(child)), name); 223 } else { 224 dout("get_name %p ino %llx.%llx err %d\n", 225 child, ceph_vinop(d_inode(child)), err); 226 } 227 228 ceph_mdsc_put_request(req); 229 return err; 230 } 231 232 const struct export_operations ceph_export_ops = { 233 .encode_fh = ceph_encode_fh, 234 .fh_to_dentry = ceph_fh_to_dentry, 235 .fh_to_parent = ceph_fh_to_parent, 236 .get_parent = ceph_get_parent, 237 .get_name = ceph_get_name, 238 }; 239