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;
75 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO,
82 err = ceph_mdsc_do_request(mdsc, NULL, req);
83 inode = req->r_target_inode;
86 ceph_mdsc_put_request(req);
88 return ERR_PTR(-ESTALE);
91 dentry = d_obtain_alias(inode);
96 err = ceph_init_dentry(dentry);
101 dout("__fh_to_dentry %llx %p dentry %p\n", ino, inode, dentry);
106 * convert regular fh to dentry
108 static struct dentry *ceph_fh_to_dentry(struct super_block *sb,
110 int fh_len, int fh_type)
112 struct ceph_nfs_fh *fh = (void *)fid->raw;
114 if (fh_type != FILEID_INO32_GEN &&
115 fh_type != FILEID_INO32_GEN_PARENT)
117 if (fh_len < sizeof(*fh) / 4)
120 dout("fh_to_dentry %llx\n", fh->ino);
121 return __fh_to_dentry(sb, fh->ino);
125 * get parent, if possible.
127 * FIXME: we could do better by querying the mds to discover the
130 static struct dentry *ceph_fh_to_parent(struct super_block *sb,
132 int fh_len, int fh_type)
134 struct ceph_nfs_confh *cfh = (void *)fid->raw;
135 struct ceph_vino vino;
137 struct dentry *dentry;
141 return ERR_PTR(-ESTALE);
142 if (fh_len < sizeof(*cfh) / 4)
143 return ERR_PTR(-ESTALE);
145 pr_debug("fh_to_parent %llx/%d\n", cfh->parent_ino,
146 cfh->parent_name_hash);
149 vino.snap = CEPH_NOSNAP;
150 inode = ceph_find_inode(sb, vino);
152 return ERR_PTR(-ESTALE);
154 dentry = d_obtain_alias(inode);
155 if (IS_ERR(dentry)) {
156 pr_err("fh_to_parent %llx -- inode %p but ENOMEM\n",
161 err = ceph_init_dentry(dentry);
166 dout("fh_to_parent %llx %p dentry %p\n", cfh->ino, inode, dentry);
170 const struct export_operations ceph_export_ops = {
171 .encode_fh = ceph_encode_fh,
172 .fh_to_dentry = ceph_fh_to_dentry,
173 .fh_to_parent = ceph_fh_to_parent,