diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/llite/llite_nfs.c')
-rw-r--r-- | drivers/staging/lustre/lustre/llite/llite_nfs.c | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/llite/llite_nfs.c b/drivers/staging/lustre/lustre/llite/llite_nfs.c new file mode 100644 index 000000000000..28cc41e90581 --- /dev/null +++ b/drivers/staging/lustre/lustre/llite/llite_nfs.c @@ -0,0 +1,319 @@ +/* + * 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, +}; |