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 ceph_vino vino;
69 vino.snap = CEPH_NOSNAP;
70 inode = ceph_find_inode(sb, vino);
72 struct ceph_mds_request *req;
75 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO,
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);
87 err = ceph_mdsc_do_request(mdsc, NULL, req);
88 inode = req->r_target_inode;
91 ceph_mdsc_put_request(req);
93 return ERR_PTR(-ESTALE);
96 return d_obtain_alias(inode);
100 * convert regular fh to dentry
102 static struct dentry *ceph_fh_to_dentry(struct super_block *sb,
104 int fh_len, int fh_type)
106 struct ceph_nfs_fh *fh = (void *)fid->raw;
108 if (fh_type != FILEID_INO32_GEN &&
109 fh_type != FILEID_INO32_GEN_PARENT)
111 if (fh_len < sizeof(*fh) / 4)
114 dout("fh_to_dentry %llx\n", fh->ino);
115 return __fh_to_dentry(sb, fh->ino);
118 static struct dentry *__get_parent(struct super_block *sb,
119 struct dentry *child, u64 ino)
121 struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
122 struct ceph_mds_request *req;
127 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT,
130 return ERR_CAST(req);
133 req->r_inode = d_inode(child);
134 ihold(d_inode(child));
136 req->r_ino1 = (struct ceph_vino) {
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);
148 err = ceph_mdsc_do_request(mdsc, NULL, req);
149 inode = req->r_target_inode;
152 ceph_mdsc_put_request(req);
154 return ERR_PTR(-ENOENT);
156 return d_obtain_alias(inode);
159 static struct dentry *ceph_get_parent(struct dentry *child)
161 /* don't re-export snaps */
162 if (ceph_snap(d_inode(child)) != CEPH_NOSNAP)
163 return ERR_PTR(-EINVAL);
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);
171 * convert regular fh to parent
173 static struct dentry *ceph_fh_to_parent(struct super_block *sb,
175 int fh_len, int fh_type)
177 struct ceph_nfs_confh *cfh = (void *)fid->raw;
178 struct dentry *dentry;
180 if (fh_type != FILEID_INO32_GEN_PARENT)
182 if (fh_len < sizeof(*cfh) / 4)
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);
192 static int ceph_get_name(struct dentry *parent, char *name,
193 struct dentry *child)
195 struct ceph_mds_client *mdsc;
196 struct ceph_mds_request *req;
199 mdsc = ceph_inode_to_client(d_inode(child))->mdsc;
200 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME,
205 inode_lock(d_inode(parent));
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);
213 err = ceph_mdsc_do_request(mdsc, NULL, req);
215 inode_unlock(d_inode(parent));
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);
224 dout("get_name %p ino %llx.%llx err %d\n",
225 child, ceph_vinop(d_inode(child)), err);
228 ceph_mdsc_put_request(req);
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,