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Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001#include <linux/ceph/ceph_debug.h>
Sage Weila8e63b72009-10-06 11:31:13 -07002
3#include <linux/exportfs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09004#include <linux/slab.h>
Sage Weila8e63b72009-10-06 11:31:13 -07005#include <asm/unaligned.h>
6
7#include "super.h"
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07008#include "mds_client.h"
Sage Weila8e63b72009-10-06 11:31:13 -07009
10/*
Sage Weila8e63b72009-10-06 11:31:13 -070011 * Basic fh
12 */
13struct ceph_nfs_fh {
14 u64 ino;
15} __attribute__ ((packed));
16
17/*
Yan, Zheng4f32b422014-03-01 18:05:41 +080018 * Larger fh that includes parent ino.
Sage Weila8e63b72009-10-06 11:31:13 -070019 */
20struct ceph_nfs_confh {
21 u64 ino, parent_ino;
Sage Weila8e63b72009-10-06 11:31:13 -070022} __attribute__ ((packed));
23
Sage Weilc8628682012-04-05 12:07:36 -070024static int ceph_encode_fh(struct inode *inode, u32 *rawfh, int *max_len,
25 struct inode *parent_inode)
Sage Weila8e63b72009-10-06 11:31:13 -070026{
Aneesh Kumar K.V92923dcb2010-10-05 16:03:41 +053027 int type;
Sage Weila8e63b72009-10-06 11:31:13 -070028 struct ceph_nfs_fh *fh = (void *)rawfh;
29 struct ceph_nfs_confh *cfh = (void *)rawfh;
Aneesh Kumar K.V92923dcb2010-10-05 16:03:41 +053030 int connected_handle_length = sizeof(*cfh)/4;
31 int handle_length = sizeof(*fh)/4;
Sage Weila8e63b72009-10-06 11:31:13 -070032
33 /* don't re-export snaps */
34 if (ceph_snap(inode) != CEPH_NOSNAP)
35 return -EINVAL;
36
Yan, Zheng4f32b422014-03-01 18:05:41 +080037 if (parent_inode && (*max_len < connected_handle_length)) {
Aneesh Kumar K.V92923dcb2010-10-05 16:03:41 +053038 *max_len = connected_handle_length;
Yan, Zheng4f32b422014-03-01 18:05:41 +080039 return FILEID_INVALID;
40 } else if (*max_len < handle_length) {
Aneesh Kumar K.Vbba0cd02010-10-05 16:03:42 +053041 *max_len = handle_length;
Yan, Zheng4f32b422014-03-01 18:05:41 +080042 return FILEID_INVALID;
Sage Weila8e63b72009-10-06 11:31:13 -070043 }
Yan, Zheng4f32b422014-03-01 18:05:41 +080044
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 }
Sage Weila8e63b72009-10-06 11:31:13 -070058 return type;
59}
60
Yan, Zheng4f32b422014-03-01 18:05:41 +080061static struct dentry *__fh_to_dentry(struct super_block *sb, u64 ino)
Sage Weila8e63b72009-10-06 11:31:13 -070062{
Sage Weil3c454cf2011-04-06 09:31:40 -070063 struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
Sage Weila8e63b72009-10-06 11:31:13 -070064 struct inode *inode;
65 struct dentry *dentry;
66 struct ceph_vino vino;
67 int err;
68
Yan, Zheng4f32b422014-03-01 18:05:41 +080069 vino.ino = ino;
Sage Weila8e63b72009-10-06 11:31:13 -070070 vino.snap = CEPH_NOSNAP;
71 inode = ceph_find_inode(sb, vino);
Sage Weil3c454cf2011-04-06 09:31:40 -070072 if (!inode) {
73 struct ceph_mds_request *req;
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 req->r_ino1 = vino;
81 req->r_num_caps = 1;
82 err = ceph_mdsc_do_request(mdsc, NULL, req);
Sage Weil45e3d3e2011-04-06 09:35:00 -070083 inode = req->r_target_inode;
84 if (inode)
Sage Weil70b666c2011-05-27 09:24:26 -070085 ihold(inode);
Sage Weil3c454cf2011-04-06 09:31:40 -070086 ceph_mdsc_put_request(req);
Sage Weil3c454cf2011-04-06 09:31:40 -070087 if (!inode)
88 return ERR_PTR(-ESTALE);
89 }
Sage Weila8e63b72009-10-06 11:31:13 -070090
91 dentry = d_obtain_alias(inode);
Dan Carpenter0d509c92010-04-21 12:31:13 +020092 if (IS_ERR(dentry)) {
Sage Weila8e63b72009-10-06 11:31:13 -070093 iput(inode);
Dan Carpenter0d509c92010-04-21 12:31:13 +020094 return dentry;
Sage Weila8e63b72009-10-06 11:31:13 -070095 }
96 err = ceph_init_dentry(dentry);
Sage Weila8e63b72009-10-06 11:31:13 -070097 if (err < 0) {
Yan, Zheng4f32b422014-03-01 18:05:41 +080098 dput(dentry);
Sage Weila8e63b72009-10-06 11:31:13 -070099 return ERR_PTR(err);
100 }
Yan, Zheng4f32b422014-03-01 18:05:41 +0800101 dout("__fh_to_dentry %llx %p dentry %p\n", ino, inode, dentry);
Sage Weila8e63b72009-10-06 11:31:13 -0700102 return dentry;
103}
104
105/*
Yan, Zheng4f32b422014-03-01 18:05:41 +0800106 * convert regular fh to dentry
Sage Weila8e63b72009-10-06 11:31:13 -0700107 */
Yan, Zheng4f32b422014-03-01 18:05:41 +0800108static struct dentry *ceph_fh_to_dentry(struct super_block *sb,
109 struct fid *fid,
Sage Weila8e63b72009-10-06 11:31:13 -0700110 int fh_len, int fh_type)
111{
Yan, Zheng4f32b422014-03-01 18:05:41 +0800112 struct ceph_nfs_fh *fh = (void *)fid->raw;
113
114 if (fh_type != FILEID_INO32_GEN &&
115 fh_type != FILEID_INO32_GEN_PARENT)
116 return NULL;
117 if (fh_len < sizeof(*fh) / 4)
118 return NULL;
119
120 dout("fh_to_dentry %llx\n", fh->ino);
121 return __fh_to_dentry(sb, fh->ino);
Sage Weila8e63b72009-10-06 11:31:13 -0700122}
123
Yan, Zheng9017c2e2014-03-01 22:11:45 +0800124static struct dentry *__get_parent(struct super_block *sb,
125 struct dentry *child, u64 ino)
126{
127 struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
128 struct ceph_mds_request *req;
129 struct inode *inode;
130 struct dentry *dentry;
131 int err;
132
133 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT,
134 USE_ANY_MDS);
135 if (IS_ERR(req))
136 return ERR_CAST(req);
137
138 if (child) {
139 req->r_inode = child->d_inode;
140 ihold(child->d_inode);
141 } else {
142 req->r_ino1 = (struct ceph_vino) {
143 .ino = ino,
144 .snap = CEPH_NOSNAP,
145 };
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 dentry = d_obtain_alias(inode);
157 if (IS_ERR(dentry)) {
158 iput(inode);
159 return dentry;
160 }
161 err = ceph_init_dentry(dentry);
162 if (err < 0) {
163 dput(dentry);
164 return ERR_PTR(err);
165 }
166 dout("__get_parent ino %llx parent %p ino %llx.%llx\n",
167 child ? ceph_ino(child->d_inode) : ino,
168 dentry, ceph_vinop(inode));
169 return dentry;
170}
171
Fengguang Wue84be112014-04-09 14:11:31 +0800172static struct dentry *ceph_get_parent(struct dentry *child)
Yan, Zheng9017c2e2014-03-01 22:11:45 +0800173{
174 /* don't re-export snaps */
175 if (ceph_snap(child->d_inode) != CEPH_NOSNAP)
176 return ERR_PTR(-EINVAL);
177
178 dout("get_parent %p ino %llx.%llx\n",
179 child, ceph_vinop(child->d_inode));
180 return __get_parent(child->d_sb, child, 0);
181}
182
Sage Weila8e63b72009-10-06 11:31:13 -0700183/*
Yan, Zheng8996f4f2014-03-01 23:09:05 +0800184 * convert regular fh to parent
Sage Weila8e63b72009-10-06 11:31:13 -0700185 */
186static struct dentry *ceph_fh_to_parent(struct super_block *sb,
Yan, Zheng8996f4f2014-03-01 23:09:05 +0800187 struct fid *fid,
Sage Weila8e63b72009-10-06 11:31:13 -0700188 int fh_len, int fh_type)
189{
190 struct ceph_nfs_confh *cfh = (void *)fid->raw;
Sage Weila8e63b72009-10-06 11:31:13 -0700191 struct dentry *dentry;
Sage Weila8e63b72009-10-06 11:31:13 -0700192
Yan, Zheng8996f4f2014-03-01 23:09:05 +0800193 if (fh_type != FILEID_INO32_GEN_PARENT)
194 return NULL;
Hugh Dickins35c2a7f2012-10-07 20:32:51 -0700195 if (fh_len < sizeof(*cfh) / 4)
Yan, Zheng8996f4f2014-03-01 23:09:05 +0800196 return NULL;
Sage Weila8e63b72009-10-06 11:31:13 -0700197
Yan, Zheng8996f4f2014-03-01 23:09:05 +0800198 dout("fh_to_parent %llx\n", cfh->parent_ino);
199 dentry = __get_parent(sb, NULL, cfh->ino);
200 if (IS_ERR(dentry) && PTR_ERR(dentry) == -ENOENT)
201 dentry = __fh_to_dentry(sb, cfh->parent_ino);
Sage Weila8e63b72009-10-06 11:31:13 -0700202 return dentry;
203}
204
Yan, Zheng19913b42014-03-06 16:40:32 +0800205static int ceph_get_name(struct dentry *parent, char *name,
206 struct dentry *child)
207{
208 struct ceph_mds_client *mdsc;
209 struct ceph_mds_request *req;
210 int err;
211
212 mdsc = ceph_inode_to_client(child->d_inode)->mdsc;
213 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME,
214 USE_ANY_MDS);
215 if (IS_ERR(req))
216 return PTR_ERR(req);
217
218 mutex_lock(&parent->d_inode->i_mutex);
219
220 req->r_inode = child->d_inode;
221 ihold(child->d_inode);
222 req->r_ino2 = ceph_vino(parent->d_inode);
223 req->r_locked_dir = parent->d_inode;
224 req->r_num_caps = 2;
225 err = ceph_mdsc_do_request(mdsc, NULL, req);
226
227 mutex_unlock(&parent->d_inode->i_mutex);
228
229 if (!err) {
230 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
231 memcpy(name, rinfo->dname, rinfo->dname_len);
232 name[rinfo->dname_len] = 0;
233 dout("get_name %p ino %llx.%llx name %s\n",
234 child, ceph_vinop(child->d_inode), name);
235 } else {
236 dout("get_name %p ino %llx.%llx err %d\n",
237 child, ceph_vinop(child->d_inode), err);
238 }
239
240 ceph_mdsc_put_request(req);
241 return err;
242}
243
Sage Weila8e63b72009-10-06 11:31:13 -0700244const struct export_operations ceph_export_ops = {
245 .encode_fh = ceph_encode_fh,
Sage Weila8e63b72009-10-06 11:31:13 -0700246 .fh_to_dentry = ceph_fh_to_dentry,
247 .fh_to_parent = ceph_fh_to_parent,
Yan, Zheng9017c2e2014-03-01 22:11:45 +0800248 .get_parent = ceph_get_parent,
Yan, Zheng19913b42014-03-06 16:40:32 +0800249 .get_name = ceph_get_name,
Sage Weila8e63b72009-10-06 11:31:13 -0700250};