| /* |
| * GPL HEADER START |
| * |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 only, |
| * as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License version 2 for more details (a copy is included |
| * in the LICENSE file that accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License |
| * version 2 along with this program; If not, see |
| * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| * GPL HEADER END |
| */ |
| /* |
| * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Use is subject to license terms. |
| * |
| * Copyright (c) 2011, 2012, Intel Corporation. |
| */ |
| /* |
| * This file is part of Lustre, http://www.lustre.org/ |
| * Lustre is a trademark of Sun Microsystems, Inc. |
| * |
| * lustre/lustre/llite/llite_nfs.c |
| * |
| * NFS export of Lustre Light File System |
| * |
| * Author: Yury Umanets <umka@clusterfs.com> |
| * Author: Huang Hua <huanghua@clusterfs.com> |
| */ |
| |
| #define DEBUG_SUBSYSTEM S_LLITE |
| #include <lustre_lite.h> |
| #include "llite_internal.h" |
| #include <linux/exportfs.h> |
| |
| __u32 get_uuid2int(const char *name, int len) |
| { |
| __u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9; |
| while (len--) { |
| __u32 key = key1 + (key0 ^ (*name++ * 7152373)); |
| if (key & 0x80000000) key -= 0x7fffffff; |
| key1 = key0; |
| key0 = key; |
| } |
| return (key0 << 1); |
| } |
| |
| static int ll_nfs_test_inode(struct inode *inode, void *opaque) |
| { |
| return lu_fid_eq(&ll_i2info(inode)->lli_fid, |
| (struct lu_fid *)opaque); |
| } |
| |
| struct inode *search_inode_for_lustre(struct super_block *sb, |
| const struct lu_fid *fid) |
| { |
| struct ll_sb_info *sbi = ll_s2sbi(sb); |
| struct ptlrpc_request *req = NULL; |
| struct inode *inode = NULL; |
| int eadatalen = 0; |
| unsigned long hash = cl_fid_build_ino(fid, |
| ll_need_32bit_api(sbi)); |
| struct md_op_data *op_data; |
| int rc; |
| ENTRY; |
| |
| CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid)); |
| |
| inode = ilookup5(sb, hash, ll_nfs_test_inode, (void *)fid); |
| if (inode) |
| RETURN(inode); |
| |
| rc = ll_get_max_mdsize(sbi, &eadatalen); |
| if (rc) |
| RETURN(ERR_PTR(rc)); |
| |
| /* Because inode is NULL, ll_prep_md_op_data can not |
| * be used here. So we allocate op_data ourselves */ |
| OBD_ALLOC_PTR(op_data); |
| if (op_data == NULL) |
| return ERR_PTR(-ENOMEM); |
| |
| op_data->op_fid1 = *fid; |
| op_data->op_mode = eadatalen; |
| op_data->op_valid = OBD_MD_FLEASIZE; |
| |
| /* mds_fid2dentry ignores f_type */ |
| rc = md_getattr(sbi->ll_md_exp, op_data, &req); |
| OBD_FREE_PTR(op_data); |
| if (rc) { |
| CERROR("can't get object attrs, fid "DFID", rc %d\n", |
| PFID(fid), rc); |
| RETURN(ERR_PTR(rc)); |
| } |
| rc = ll_prep_inode(&inode, req, sb, NULL); |
| ptlrpc_req_finished(req); |
| if (rc) |
| RETURN(ERR_PTR(rc)); |
| |
| RETURN(inode); |
| } |
| |
| struct lustre_nfs_fid { |
| struct lu_fid lnf_child; |
| struct lu_fid lnf_parent; |
| }; |
| |
| static struct dentry * |
| ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent) |
| { |
| struct inode *inode; |
| struct dentry *result; |
| ENTRY; |
| |
| CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid)); |
| if (!fid_is_sane(fid)) |
| RETURN(ERR_PTR(-ESTALE)); |
| |
| inode = search_inode_for_lustre(sb, fid); |
| if (IS_ERR(inode)) |
| RETURN(ERR_PTR(PTR_ERR(inode))); |
| |
| if (is_bad_inode(inode)) { |
| /* we didn't find the right inode.. */ |
| iput(inode); |
| RETURN(ERR_PTR(-ESTALE)); |
| } |
| |
| /** |
| * It is an anonymous dentry without OST objects created yet. |
| * We have to find the parent to tell MDS how to init lov objects. |
| */ |
| if (S_ISREG(inode->i_mode) && !ll_i2info(inode)->lli_has_smd && |
| parent != NULL) { |
| struct ll_inode_info *lli = ll_i2info(inode); |
| |
| spin_lock(&lli->lli_lock); |
| lli->lli_pfid = *parent; |
| spin_unlock(&lli->lli_lock); |
| } |
| |
| result = d_obtain_alias(inode); |
| if (IS_ERR(result)) |
| RETURN(result); |
| |
| ll_dops_init(result, 1, 0); |
| |
| RETURN(result); |
| } |
| |
| #define LUSTRE_NFS_FID 0x97 |
| |
| /** |
| * \a connectable - is nfsd will connect himself or this should be done |
| * at lustre |
| * |
| * The return value is file handle type: |
| * 1 -- contains child file handle; |
| * 2 -- contains child file handle and parent file handle; |
| * 255 -- error. |
| */ |
| static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen, |
| struct inode *parent) |
| { |
| struct lustre_nfs_fid *nfs_fid = (void *)fh; |
| ENTRY; |
| |
| CDEBUG(D_INFO, "encoding for (%lu,"DFID") maxlen=%d minlen=%d\n", |
| inode->i_ino, PFID(ll_inode2fid(inode)), *plen, |
| (int)sizeof(struct lustre_nfs_fid)); |
| |
| if (*plen < sizeof(struct lustre_nfs_fid) / 4) |
| RETURN(255); |
| |
| nfs_fid->lnf_child = *ll_inode2fid(inode); |
| nfs_fid->lnf_parent = *ll_inode2fid(parent); |
| *plen = sizeof(struct lustre_nfs_fid) / 4; |
| |
| RETURN(LUSTRE_NFS_FID); |
| } |
| |
| static int ll_nfs_get_name_filldir(void *cookie, const char *name, int namelen, |
| loff_t hash, u64 ino, unsigned type) |
| { |
| /* It is hack to access lde_fid for comparison with lgd_fid. |
| * So the input 'name' must be part of the 'lu_dirent'. */ |
| struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name); |
| struct ll_getname_data *lgd = cookie; |
| struct lu_fid fid; |
| |
| fid_le_to_cpu(&fid, &lde->lde_fid); |
| if (lu_fid_eq(&fid, &lgd->lgd_fid)) { |
| memcpy(lgd->lgd_name, name, namelen); |
| lgd->lgd_name[namelen] = 0; |
| lgd->lgd_found = 1; |
| } |
| return lgd->lgd_found; |
| } |
| |
| static int ll_get_name(struct dentry *dentry, char *name, |
| struct dentry *child) |
| { |
| struct inode *dir = dentry->d_inode; |
| struct ll_getname_data lgd; |
| __u64 offset = 0; |
| int rc; |
| ENTRY; |
| |
| if (!dir || !S_ISDIR(dir->i_mode)) |
| GOTO(out, rc = -ENOTDIR); |
| |
| if (!dir->i_fop) |
| GOTO(out, rc = -EINVAL); |
| |
| lgd.lgd_name = name; |
| lgd.lgd_fid = ll_i2info(child->d_inode)->lli_fid; |
| lgd.lgd_found = 0; |
| |
| mutex_lock(&dir->i_mutex); |
| rc = ll_dir_read(dir, &offset, &lgd, ll_nfs_get_name_filldir); |
| mutex_unlock(&dir->i_mutex); |
| if (!rc && !lgd.lgd_found) |
| rc = -ENOENT; |
| EXIT; |
| |
| out: |
| return rc; |
| } |
| |
| static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid, |
| int fh_len, int fh_type) |
| { |
| struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid; |
| |
| if (fh_type != LUSTRE_NFS_FID) |
| RETURN(ERR_PTR(-EPROTO)); |
| |
| RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent)); |
| } |
| |
| static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid, |
| int fh_len, int fh_type) |
| { |
| struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid; |
| |
| if (fh_type != LUSTRE_NFS_FID) |
| RETURN(ERR_PTR(-EPROTO)); |
| |
| RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL)); |
| } |
| |
| static struct dentry *ll_get_parent(struct dentry *dchild) |
| { |
| struct ptlrpc_request *req = NULL; |
| struct inode *dir = dchild->d_inode; |
| struct ll_sb_info *sbi; |
| struct dentry *result = NULL; |
| struct mdt_body *body; |
| static char dotdot[] = ".."; |
| struct md_op_data *op_data; |
| int rc; |
| int lmmsize; |
| ENTRY; |
| |
| LASSERT(dir && S_ISDIR(dir->i_mode)); |
| |
| sbi = ll_s2sbi(dir->i_sb); |
| |
| CDEBUG(D_INFO, "getting parent for (%lu,"DFID")\n", |
| dir->i_ino, PFID(ll_inode2fid(dir))); |
| |
| rc = ll_get_max_mdsize(sbi, &lmmsize); |
| if (rc != 0) |
| RETURN(ERR_PTR(rc)); |
| |
| op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot, |
| strlen(dotdot), lmmsize, |
| LUSTRE_OPC_ANY, NULL); |
| if (IS_ERR(op_data)) |
| RETURN((void *)op_data); |
| |
| rc = md_getattr_name(sbi->ll_md_exp, op_data, &req); |
| ll_finish_md_op_data(op_data); |
| if (rc) { |
| CERROR("failure %d inode %lu get parent\n", rc, dir->i_ino); |
| RETURN(ERR_PTR(rc)); |
| } |
| body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY); |
| LASSERT(body->valid & OBD_MD_FLID); |
| |
| CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n", |
| PFID(ll_inode2fid(dir)), PFID(&body->fid1)); |
| |
| result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL); |
| |
| ptlrpc_req_finished(req); |
| RETURN(result); |
| } |
| |
| struct export_operations lustre_export_operations = { |
| .get_parent = ll_get_parent, |
| .encode_fh = ll_encode_fh, |
| .get_name = ll_get_name, |
| .fh_to_dentry = ll_fh_to_dentry, |
| .fh_to_parent = ll_fh_to_parent, |
| }; |