Feature #22105 ยป snap_export.patch
| fs/ceph/export.c | ||
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u64 ino, parent_ino;
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} __attribute__ ((packed));
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/*
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* fh for snapped inode
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*/
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struct ceph_nfs_snapfh {
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u64 ino;
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u64 snapid;
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u64 parent_ino;
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u32 hash;
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} __attribute__ ((packed));
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static int ceph_encode_snapfh(struct inode *inode, u32 *rawfh, int *max_len,
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struct inode *parent_inode)
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{
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const static int snap_handle_length =
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sizeof(struct ceph_nfs_snapfh) >> 2;
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struct ceph_nfs_snapfh *sfh = (void *)rawfh;
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u64 snapid = ceph_snap(inode);
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bool no_parent = true;
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if (*max_len < snap_handle_length) {
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*max_len = snap_handle_length;
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return FILEID_INVALID;
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}
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if (snapid != CEPH_SNAPDIR) {
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struct inode *dir;
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struct dentry *dentry = d_find_alias(inode);
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if (!dentry)
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return -EINVAL;
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rcu_read_lock();
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dir = d_inode_rcu(dentry->d_parent);
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if (ceph_snap(dir) != CEPH_SNAPDIR) {
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sfh->parent_ino = ceph_ino(dir);
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sfh->hash = ceph_dentry_hash(dir, dentry);
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no_parent = false;
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}
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rcu_read_unlock();
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dput(dentry);
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}
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sfh->ino = ceph_ino(inode);
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sfh->snapid = snapid;
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if (no_parent) {
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sfh->parent_ino = sfh->ino;
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sfh->hash = 0;
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}
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*max_len = snap_handle_length;
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return FILEID_BTRFS_WITH_PARENT;
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}
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static int ceph_encode_fh(struct inode *inode, u32 *rawfh, int *max_len,
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struct inode *parent_inode)
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{
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const static int handle_length =
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sizeof(struct ceph_nfs_fh) >> 2;
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const static int connected_handle_length =
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sizeof(struct ceph_nfs_confh) >> 2;
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int type;
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struct ceph_nfs_fh *fh = (void *)rawfh;
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struct ceph_nfs_confh *cfh = (void *)rawfh;
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int connected_handle_length = sizeof(*cfh)/4;
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int handle_length = sizeof(*fh)/4;
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/* don't re-export snaps */
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if (ceph_snap(inode) != CEPH_NOSNAP)
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return -EINVAL;
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return ceph_encode_snapfh(inode, rawfh, max_len, parent_inode);
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if (parent_inode && (*max_len < connected_handle_length)) {
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*max_len = connected_handle_length;
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| ... | ... | |
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}
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if (parent_inode) {
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struct ceph_nfs_confh *cfh = (void *)rawfh;
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dout("encode_fh %llx with parent %llx\n",
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ceph_ino(inode), ceph_ino(parent_inode));
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cfh->ino = ceph_ino(inode);
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| ... | ... | |
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*max_len = connected_handle_length;
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type = FILEID_INO32_GEN_PARENT;
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} else {
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struct ceph_nfs_fh *fh = (void *)rawfh;
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dout("encode_fh %llx\n", ceph_ino(inode));
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fh->ino = ceph_ino(inode);
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*max_len = handle_length;
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| ... | ... | |
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return d_obtain_alias(inode);
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}
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static struct dentry *__snapfh_to_dentry(struct super_block *sb,
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struct ceph_nfs_snapfh *sfh,
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bool want_parent)
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{
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struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
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struct ceph_mds_request *req;
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struct inode *inode;
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struct ceph_vino vino;
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int mask;
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int err;
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if (want_parent) {
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vino.ino = sfh->parent_ino;
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if (sfh->snapid == CEPH_SNAPDIR)
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vino.snap = CEPH_NOSNAP;
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else if (sfh->ino == sfh->parent_ino)
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vino.snap = CEPH_SNAPDIR;
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else
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vino.snap = sfh->snapid;
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} else {
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vino.ino = sfh->ino;
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vino.snap = sfh->snapid;
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}
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inode = ceph_find_inode(sb, vino);
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if (inode)
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return d_obtain_alias(inode);
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req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO,
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USE_ANY_MDS);
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if (IS_ERR(req))
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return ERR_CAST(req);
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mask = CEPH_STAT_CAP_INODE;
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if (ceph_security_xattr_wanted(d_inode(sb->s_root)))
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mask |= CEPH_CAP_XATTR_SHARED;
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req->r_args.lookupino.mask = cpu_to_le32(mask);
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if (vino.snap < CEPH_NOSNAP) {
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req->r_args.lookupino.snapid = cpu_to_le64(vino.snap);
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if (!want_parent && sfh->ino != sfh->parent_ino) {
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req->r_args.lookupino.parent = cpu_to_le64(sfh->parent_ino);
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req->r_args.lookupino.hash = cpu_to_le32(sfh->hash);
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}
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}
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req->r_ino1 = vino;
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req->r_num_caps = 1;
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err = ceph_mdsc_do_request(mdsc, NULL, req);
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inode = req->r_target_inode;
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if (inode) {
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if (vino.snap == CEPH_SNAPDIR)
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inode = ceph_get_snapdir(inode);
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else if (ceph_snap(inode) == vino.snap)
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ihold(inode);
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else
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inode = NULL;
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}
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ceph_mdsc_put_request(req);
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if (!inode)
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return ERR_PTR(-ESTALE);
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if (inode->i_nlink == 0) {
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iput(inode);
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return ERR_PTR(-ESTALE);
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}
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return d_obtain_alias(inode);
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}
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/*
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* convert regular fh to dentry
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*/
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| ... | ... | |
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{
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struct ceph_nfs_fh *fh = (void *)fid->raw;
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if (fh_type == FILEID_BTRFS_WITH_PARENT) {
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struct ceph_nfs_snapfh *sfh = (void *)fid->raw;
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return __snapfh_to_dentry(sb, sfh, false);
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}
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if (fh_type != FILEID_INO32_GEN &&
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fh_type != FILEID_INO32_GEN_PARENT)
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return NULL;
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| ... | ... | |
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static struct dentry *ceph_get_parent(struct dentry *child)
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{
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/* don't re-export snaps */
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if (ceph_snap(d_inode(child)) != CEPH_NOSNAP)
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return ERR_PTR(-EINVAL);
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struct inode *inode = d_inode(child);
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if (ceph_snap(inode) == CEPH_SNAPDIR)
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return __fh_to_dentry(inode->i_sb, ceph_ino(inode));
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if (ceph_snap(inode) < CEPH_NOSNAP) {
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struct dentry *dn;
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struct inode* dir;
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if (!d_is_dir(child))
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return ERR_PTR(-EINVAL);
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dn = __fh_to_dentry(inode->i_sb, ceph_ino(inode));
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if (IS_ERR_OR_NULL(dn))
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return dn;
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dir = ceph_get_snapdir(d_inode(dn));
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dput(dn);
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return d_obtain_alias(dir);
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}
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dout("get_parent %p ino %llx.%llx\n",
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child, ceph_vinop(d_inode(child)));
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dout("get_parent %p ino %llx.%llx\n", child, ceph_vinop(inode));
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return __get_parent(child->d_sb, child, 0);
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}
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| ... | ... | |
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struct ceph_nfs_confh *cfh = (void *)fid->raw;
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struct dentry *dentry;
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if (fh_type == FILEID_BTRFS_WITH_PARENT) {
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struct ceph_nfs_snapfh *sfh = (void *)fid->raw;
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return __snapfh_to_dentry(sb, sfh, true);
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}
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if (fh_type != FILEID_INO32_GEN_PARENT)
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return NULL;
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if (fh_len < sizeof(*cfh) / 4)
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| ... | ... | |
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return dentry;
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}
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struct getdents_callback {
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struct dir_context ctx;
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struct file *file;
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u64 ino;
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u64 snap;
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char *name;
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unsigned sequence;
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bool found;
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};
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static int filldir_one(struct dir_context *ctx, const char *name, int len,
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loff_t pos, u64 ino, unsigned int d_type)
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{
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struct getdents_callback *buf =
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container_of(ctx, struct getdents_callback, ctx);
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struct ceph_file_info *fi = buf->file->private_data;
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struct ceph_mds_reply_info_parsed *rinfo;
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if (!fi->last_readdir)
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return -1;
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rinfo = &fi->last_readdir->r_reply_info;
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if (!rinfo || !rinfo->dir_nr)
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return true;
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chunk_offset = rinfo->dir_entries[0].offset;
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return new_pos < chunk_offset ||
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is_hash_order(new_pos) != is_hash_order(chunk_offset);
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int result = 0;
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buf->sequence++;
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}
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static int __get_snap_name(struct dentry *parent, char *name,
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struct dentry *child)
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{
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struct inode *inode = d_inode(child);
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struct inode *dir = d_inode(child);
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struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
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struct dir_context ctx = {
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.actor = filldir_noop,
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};
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struct file *file;
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if (ceph_ino(inode) != ceph_ino(dir))
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return -EINVAL;
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if (ceph_snap(inode) == CEPH_SNAPDIR) {
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if (ceph_ino(dir) == CEPH_NOSNAP) {
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return -EINVAL;
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strcpy(name, fsc->mount_options->snapdir_name);
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return 0;
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}
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if (ceph_snap(dir) != CEPH_SNAPDIR)
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return -EINVAL;
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file = dentry_open(path, O_RDONLY, cred);
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if (IS_ERR(file))
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goto out;
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iterate_dir(file, &ctx)
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}
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static int ceph_get_name(struct dentry *parent, char *name,
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struct dentry *child)
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{
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struct ceph_mds_client *mdsc;
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struct ceph_mds_request *req;
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struct inode *inode = d_inode(child);
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int err;
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mdsc = ceph_inode_to_client(d_inode(child))->mdsc;
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if (ceph_snap(inode) != CEPH_NOSNAP)
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return __get_snap_name(parent, name, child);
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mdsc = ceph_inode_to_client(inode)->mdsc;
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req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME,
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USE_ANY_MDS);
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if (IS_ERR(req))
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| ... | ... | |
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inode_lock(d_inode(parent));
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req->r_inode = d_inode(child);
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ihold(d_inode(child));
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req->r_inode = inode;
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ihold(inode);
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req->r_ino2 = ceph_vino(d_inode(parent));
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req->r_parent = d_inode(parent);
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set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
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| ... | ... | |
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memcpy(name, rinfo->dname, rinfo->dname_len);
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name[rinfo->dname_len] = 0;
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dout("get_name %p ino %llx.%llx name %s\n",
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child, ceph_vinop(d_inode(child)), name);
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child, ceph_vinop(inode), name);
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} else {
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dout("get_name %p ino %llx.%llx err %d\n",
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child, ceph_vinop(d_inode(child)), err);
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child, ceph_vinop(inode), err);
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}
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ceph_mdsc_put_request(req);
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| include/linux/ceph/ceph_fs.h | ||
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__le64 length; /* num bytes to lock from start */
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__u8 wait; /* will caller wait for lock to become available? */
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} __attribute__ ((packed)) filelock_change;
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struct {
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__le32 mask; /* CEPH_CAP_* */
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__le64 snapid;
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__le64 parent;
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__le32 hash;
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} __attribute__ ((packed)) lookupino;
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} __attribute__ ((packed));
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#define CEPH_MDS_FLAG_REPLAY 1 /* this is a replayed op */
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