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);
102 err = ceph_init_dentry(dentry);
107 dout("__fh_to_dentry %llx %p dentry %p\n", ino, inode, dentry);
112 * convert regular fh to dentry
114 static struct dentry *ceph_fh_to_dentry(struct super_block *sb,
116 int fh_len, int fh_type)
118 struct ceph_nfs_fh *fh = (void *)fid->raw;
120 if (fh_type != FILEID_INO32_GEN &&
121 fh_type != FILEID_INO32_GEN_PARENT)
123 if (fh_len < sizeof(*fh) / 4)
126 dout("fh_to_dentry %llx\n", fh->ino);
127 return __fh_to_dentry(sb, fh->ino);
130 static struct dentry *__get_parent(struct super_block *sb,
131 struct dentry *child, u64 ino)
133 struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
134 struct ceph_mds_request *req;
136 struct dentry *dentry;
140 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT,
143 return ERR_CAST(req);
146 req->r_inode = d_inode(child);
147 ihold(d_inode(child));
149 req->r_ino1 = (struct ceph_vino) {
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);
161 err = ceph_mdsc_do_request(mdsc, NULL, req);
162 inode = req->r_target_inode;
165 ceph_mdsc_put_request(req);
167 return ERR_PTR(-ENOENT);
169 dentry = d_obtain_alias(inode);
170 if (IS_ERR(dentry)) {
174 err = ceph_init_dentry(dentry);
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));
185 static struct dentry *ceph_get_parent(struct dentry *child)
187 /* don't re-export snaps */
188 if (ceph_snap(d_inode(child)) != CEPH_NOSNAP)
189 return ERR_PTR(-EINVAL);
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);
197 * convert regular fh to parent
199 static struct dentry *ceph_fh_to_parent(struct super_block *sb,
201 int fh_len, int fh_type)
203 struct ceph_nfs_confh *cfh = (void *)fid->raw;
204 struct dentry *dentry;
206 if (fh_type != FILEID_INO32_GEN_PARENT)
208 if (fh_len < sizeof(*cfh) / 4)
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);
218 static int ceph_get_name(struct dentry *parent, char *name,
219 struct dentry *child)
221 struct ceph_mds_client *mdsc;
222 struct ceph_mds_request *req;
225 mdsc = ceph_inode_to_client(d_inode(child))->mdsc;
226 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME,
231 inode_lock(d_inode(parent));
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);
238 err = ceph_mdsc_do_request(mdsc, NULL, req);
240 inode_unlock(d_inode(parent));
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);
249 dout("get_name %p ino %llx.%llx err %d\n",
250 child, ceph_vinop(d_inode(child)), err);
253 ceph_mdsc_put_request(req);
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,