1 #include <linux/ceph/ceph_debug.h>
3 #include <linux/exportfs.h>
4 #include <linux/slab.h>
5 #include <asm/unaligned.h>
8 #include "mds_client.h"
15 } __attribute__ ((packed));
18 * Larger fh that includes parent ino.
20 struct ceph_nfs_confh {
22 } __attribute__ ((packed));
24 static int ceph_encode_fh(struct inode *inode, u32 *rawfh, int *max_len,
25 struct inode *parent_inode)
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;
33 /* don't re-export snaps */
34 if (ceph_snap(inode) != CEPH_NOSNAP)
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;
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;
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;
61 static struct dentry *__fh_to_dentry(struct super_block *sb, u64 ino)
63 struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
65 struct dentry *dentry;
66 struct ceph_vino vino;
70 vino.snap = CEPH_NOSNAP;
71 inode = ceph_find_inode(sb, vino);
73 struct ceph_mds_request *req;
76 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO,
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);
88 err = ceph_mdsc_do_request(mdsc, NULL, req);
89 inode = req->r_target_inode;
92 ceph_mdsc_put_request(req);
94 return ERR_PTR(-ESTALE);
97 dentry = d_obtain_alias(inode);
100 err = ceph_init_dentry(dentry);
105 dout("__fh_to_dentry %llx %p dentry %p\n", ino, inode, dentry);
110 * convert regular fh to dentry
112 static struct dentry *ceph_fh_to_dentry(struct super_block *sb,
114 int fh_len, int fh_type)
116 struct ceph_nfs_fh *fh = (void *)fid->raw;
118 if (fh_type != FILEID_INO32_GEN &&
119 fh_type != FILEID_INO32_GEN_PARENT)
121 if (fh_len < sizeof(*fh) / 4)
124 dout("fh_to_dentry %llx\n", fh->ino);
125 return __fh_to_dentry(sb, fh->ino);
128 static struct dentry *__get_parent(struct super_block *sb,
129 struct dentry *child, u64 ino)
131 struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
132 struct ceph_mds_request *req;
134 struct dentry *dentry;
138 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT,
141 return ERR_CAST(req);
144 req->r_inode = d_inode(child);
145 ihold(d_inode(child));
147 req->r_ino1 = (struct ceph_vino) {
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);
159 err = ceph_mdsc_do_request(mdsc, NULL, req);
161 ceph_mdsc_put_request(req);
165 inode = req->r_target_inode;
168 ceph_mdsc_put_request(req);
170 return ERR_PTR(-ENOENT);
172 dentry = d_obtain_alias(inode);
175 err = ceph_init_dentry(dentry);
180 dout("__get_parent ino %llx parent %p ino %llx.%llx\n",
181 child ? ceph_ino(d_inode(child)) : ino,
182 dentry, ceph_vinop(inode));
186 static struct dentry *ceph_get_parent(struct dentry *child)
188 /* don't re-export snaps */
189 if (ceph_snap(d_inode(child)) != CEPH_NOSNAP)
190 return ERR_PTR(-EINVAL);
192 dout("get_parent %p ino %llx.%llx\n",
193 child, ceph_vinop(d_inode(child)));
194 return __get_parent(child->d_sb, child, 0);
198 * convert regular fh to parent
200 static struct dentry *ceph_fh_to_parent(struct super_block *sb,
202 int fh_len, int fh_type)
204 struct ceph_nfs_confh *cfh = (void *)fid->raw;
205 struct dentry *dentry;
207 if (fh_type != FILEID_INO32_GEN_PARENT)
209 if (fh_len < sizeof(*cfh) / 4)
212 dout("fh_to_parent %llx\n", cfh->parent_ino);
213 dentry = __get_parent(sb, NULL, cfh->ino);
214 if (unlikely(dentry == ERR_PTR(-ENOENT)))
215 dentry = __fh_to_dentry(sb, cfh->parent_ino);
219 static int ceph_get_name(struct dentry *parent, char *name,
220 struct dentry *child)
222 struct ceph_mds_client *mdsc;
223 struct ceph_mds_request *req;
226 mdsc = ceph_inode_to_client(d_inode(child))->mdsc;
227 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME,
232 inode_lock(d_inode(parent));
234 req->r_inode = d_inode(child);
235 ihold(d_inode(child));
236 req->r_ino2 = ceph_vino(d_inode(parent));
237 req->r_locked_dir = d_inode(parent);
239 err = ceph_mdsc_do_request(mdsc, NULL, req);
241 inode_unlock(d_inode(parent));
244 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
245 memcpy(name, rinfo->dname, rinfo->dname_len);
246 name[rinfo->dname_len] = 0;
247 dout("get_name %p ino %llx.%llx name %s\n",
248 child, ceph_vinop(d_inode(child)), name);
250 dout("get_name %p ino %llx.%llx err %d\n",
251 child, ceph_vinop(d_inode(child)), err);
254 ceph_mdsc_put_request(req);
258 const struct export_operations ceph_export_ops = {
259 .encode_fh = ceph_encode_fh,
260 .fh_to_dentry = ceph_fh_to_dentry,
261 .fh_to_parent = ceph_fh_to_parent,
262 .get_parent = ceph_get_parent,
263 .get_name = ceph_get_name,