-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+/*
+ * -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=8:tabstop=8:
*
- * NFS export of Lustre Light File System
+ * GPL HEADER START
*
- * Copyright (c) 2002, 2003 Cluster File Systems, Inc.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
- * This file is part of Lustre, http://www.lustre.org.
+ * 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.
*
- * Lustre is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License 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).
*
- * Lustre 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 for more details.
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see [sun.com URL with a
+ * copy of GPLv2].
*
- * You should have received a copy of the GNU General Public License
- * along with Lustre; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * 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 2008 Sun Microsystems, Inc. All rights reserved
+ * Use is subject to license terms.
+ */
+/*
+ * 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 <linux/lustre_lite.h>
+#include <lustre_lite.h>
#include "llite_internal.h"
+#ifdef HAVE_LINUX_EXPORTFS_H
+#include <linux/exportfs.h>
+#endif
-__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);
-}
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
-static int ll_nfs_test_inode(struct inode *inode, unsigned long ino,
- void *opaque)
-#else
static int ll_nfs_test_inode(struct inode *inode, void *opaque)
-#endif
{
- struct lustre_id *iid = opaque;
-
- if (inode->i_ino == id_ino(iid) &&
- inode->i_generation == id_gen(iid))
- return 1;
-
- return 0;
+ return lu_fid_eq(&ll_i2info(inode)->lli_fid,
+ (struct lu_fid *)opaque);
}
-static struct inode * search_inode_for_lustre(struct super_block *sb,
- unsigned long ino,
- unsigned long generation,
- int mode)
+
+static struct inode *search_inode_for_lustre(struct super_block *sb,
+ struct lu_fid *fid,
+ int mode)
{
+ struct ll_sb_info *sbi = ll_s2sbi(sb);
struct ptlrpc_request *req = NULL;
- struct ll_sb_info *sbi = ll_s2sbi(sb);
- struct lustre_id id;
- __u64 valid = 0;
- int eadatalen = 0, rc;
- struct inode *inode = NULL;
- struct lustre_id iid;
-
- id_ino(&iid) = (__u64)ino;
- id_gen(&iid) = generation;
- inode = ILOOKUP(sb, ino, ll_nfs_test_inode, &iid);
+ struct inode *inode = NULL;
+ unsigned long valid = 0;
+ int eadatalen = 0;
+ ino_t ino = ll_fid_build_ino(sbi, fid);
+ int rc;
+ ENTRY;
+ CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", ino, PFID(fid));
+
+ inode = ILOOKUP(sb, ino, ll_nfs_test_inode, fid);
if (inode)
- return inode;
+ RETURN(inode);
+
if (S_ISREG(mode)) {
- eadatalen = obd_size_diskmd(sbi->ll_dt_exp, NULL);
+ rc = ll_get_max_mdsize(sbi, &eadatalen);
+ if (rc)
+ RETURN(ERR_PTR(rc));
valid |= OBD_MD_FLEASIZE;
}
- id_type(&id) = mode;
- id_ino(&id) = (__u64)ino;
- id_gen(&id) = generation;
- rc = md_getattr(sbi->ll_md_exp, &id, valid, NULL, NULL, 0,
- eadatalen, &req);
+ rc = md_getattr(sbi->ll_md_exp, fid, NULL, valid, eadatalen, &req);
if (rc) {
- CERROR("failure %d inode %lu\n", rc, ino);
- return ERR_PTR(rc);
+ CERROR("can't get object attrs, fid "DFID", rc %d\n",
+ PFID(fid), rc);
+ RETURN(ERR_PTR(rc));
}
- rc = ll_prep_inode(sbi->ll_dt_exp, sbi->ll_md_exp,
- &inode, req, 0, sb);
- if (rc) {
- ptlrpc_req_finished(req);
- return ERR_PTR(rc);
- }
+ rc = ll_prep_inode(&inode, req, sb);
ptlrpc_req_finished(req);
+ if (rc)
+ RETURN(ERR_PTR(rc));
- return inode;
+ RETURN(inode);
}
-extern struct dentry_operations ll_d_ops;
-
-static struct dentry *ll_iget_for_nfs(struct super_block *sb, unsigned long ino,
- __u32 generation, umode_t mode)
+static struct dentry *ll_iget_for_nfs(struct super_block *sb,
+ struct lu_fid *fid,
+ umode_t mode)
{
- struct inode *inode;
+ struct inode *inode;
struct dentry *result;
- struct list_head *lp;
+ ENTRY;
- if (ino == 0)
- return ERR_PTR(-ESTALE);
+ 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, ino, generation, mode);
- if (IS_ERR(inode)) {
- return ERR_PTR(PTR_ERR(inode));
- }
- if (is_bad_inode(inode) ||
- (generation && inode->i_generation != generation)){
+ inode = search_inode_for_lustre(sb, fid, mode);
+ if (IS_ERR(inode))
+ RETURN(ERR_PTR(PTR_ERR(inode)));
+
+ if (is_bad_inode(inode)) {
/* we didn't find the right inode.. */
- CERROR(" Inode %lu, Bad count: %lu %d or version %u %u\n",
- inode->i_ino, (unsigned long)inode->i_nlink,
- atomic_read(&inode->i_count), inode->i_generation,
- generation);
+ CERROR("can't get inode by fid "DFID"\n",
+ PFID(fid));
iput(inode);
- return ERR_PTR(-ESTALE);
+ RETURN(ERR_PTR(-ESTALE));
}
- /* now to find a dentry.
- * If possible, get a well-connected one
- */
- spin_lock(&dcache_lock);
- for (lp = inode->i_dentry.next; lp != &inode->i_dentry ; lp=lp->next) {
- result = list_entry(lp,struct dentry, d_alias);
- if (!(result->d_flags & DCACHE_DISCONNECTED)) {
- dget_locked(result);
- ll_set_dflags(result, DCACHE_REFERENCED);
- spin_unlock(&dcache_lock);
- iput(inode);
- return result;
- }
- }
- spin_unlock(&dcache_lock);
- result = d_alloc_root(inode);
- if (result == NULL) {
+ result = d_alloc_anon(inode);
+ if (!result) {
iput(inode);
- return ERR_PTR(-ENOMEM);
+ RETURN(ERR_PTR(-ENOMEM));
}
- result->d_flags |= DCACHE_DISCONNECTED;
-
+
ll_set_dd(result);
- result->d_op = &ll_d_ops;
- return result;
+
+ lock_dentry(result);
+ if (unlikely(result->d_op == &ll_init_d_ops)) {
+ result->d_op = &ll_d_ops;
+ unlock_dentry(result);
+ smp_wmb();
+ ll_d_wakeup(result);
+ } else {
+ result->d_op = &ll_d_ops;
+ unlock_dentry(result);
+ }
+
+ RETURN(result);
+}
+
+/*
+ * This length is counted as amount of __u32,
+ * It is composed of a fid and a mode
+ */
+#define ONE_FH_LEN (sizeof(struct lu_fid)/4 + 1)
+
+static struct dentry *ll_decode_fh(struct super_block *sb, __u32 *fh, int fh_len,
+ int fh_type,
+ int (*acceptable)(void *, struct dentry *),
+ void *context)
+{
+ struct lu_fid *parent = NULL;
+ struct lu_fid *child;
+ struct dentry *entry;
+ ENTRY;
+
+ CDEBUG(D_INFO, "decoding for "DFID" fh_len=%d fh_type=%d\n",
+ PFID((struct lu_fid*)fh), fh_len, fh_type);
+
+ if (fh_type != 1 && fh_type != 2)
+ RETURN(ERR_PTR(-ESTALE));
+ if (fh_len < ONE_FH_LEN * fh_type)
+ RETURN(ERR_PTR(-ESTALE));
+
+ child = (struct lu_fid*)fh;
+ if (fh_type == 2)
+ parent = (struct lu_fid*)(fh + ONE_FH_LEN);
+
+ entry = sb->s_export_op->find_exported_dentry(sb, child, parent,
+ acceptable, context);
+ RETURN(entry);
}
-struct dentry *ll_fh_to_dentry(struct super_block *sb, __u32 *data, int len,
- int fhtype, int parent)
+/* 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 dentry *de, __u32 *fh, int *plen, int connectable)
{
- switch (fhtype) {
- case 2:
- if (len < 5)
- break;
- if (parent)
- return ll_iget_for_nfs(sb, data[3], 0, data[4]);
- case 1:
- if (len < 3)
- break;
- if (parent)
- break;
- return ll_iget_for_nfs(sb, data[0], data[1], data[2]);
- default: break;
+ struct inode *inode = de->d_inode;
+ struct lu_fid *fid = ll_inode2fid(inode);
+ ENTRY;
+
+ CDEBUG(D_INFO, "encoding for (%lu,"DFID") maxlen=%d minlen=%d\n",
+ inode->i_ino, PFID(fid), *plen, (int)ONE_FH_LEN);
+
+ if (*plen < ONE_FH_LEN)
+ RETURN(255);
+
+ memcpy((char*)fh, fid, sizeof(*fid));
+ *(fh + ONE_FH_LEN - 1) = (__u32)(S_IFMT & inode->i_mode);
+
+ if (de->d_parent && *plen >= ONE_FH_LEN * 2) {
+ struct inode *parent = de->d_parent->d_inode;
+ fh += ONE_FH_LEN;
+ memcpy((char*)fh, &ll_i2info(parent)->lli_fid, sizeof(*fid));
+ *(fh + ONE_FH_LEN - 1) = (__u32)(S_IFMT & parent->i_mode);
+ *plen = ONE_FH_LEN * 2;
+ RETURN(2);
+ } else {
+ *plen = ONE_FH_LEN;
+ RETURN(1);
}
- return ERR_PTR(-EINVAL);
}
-int ll_dentry_to_fh(struct dentry *dentry, __u32 *datap, int *lenp,
- int need_parent)
+static struct dentry *ll_get_dentry(struct super_block *sb, void *data)
{
- if (*lenp < 3)
- return 255;
- *datap++ = dentry->d_inode->i_ino;
- *datap++ = dentry->d_inode->i_generation;
- *datap++ = (__u32)(S_IFMT & dentry->d_inode->i_mode);
-
- if (*lenp == 3 || S_ISDIR(dentry->d_inode->i_mode)) {
- *lenp = 3;
- return 1;
- }
- if (dentry->d_parent) {
- *datap++ = dentry->d_parent->d_inode->i_ino;
- *datap++ = (__u32)(S_IFMT & dentry->d_parent->d_inode->i_mode);
-
- *lenp = 5;
- return 2;
- }
- *lenp = 3;
- return 1;
+ struct lu_fid *fid;
+ struct dentry *entry;
+ __u32 mode;
+ ENTRY;
+
+ fid = (struct lu_fid *)data;
+ mode = *((__u32*)data + ONE_FH_LEN - 1);
+
+ entry = ll_iget_for_nfs(sb, fid, mode);
+ RETURN(entry);
}
+
+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[] = "..";
+ int rc;
+ 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 = md_getattr_name(sbi->ll_md_exp, ll_inode2fid(dir), NULL,
+ dotdot, strlen(dotdot) + 1, 0, 0,
+ ll_i2suppgid(dir), &req);
+ 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, S_IFDIR);
+
+ ptlrpc_req_finished(req);
+ RETURN(result);
+}
+
+struct export_operations lustre_export_operations = {
+ .get_parent = ll_get_parent,
+ .get_dentry = ll_get_dentry,
+ .encode_fh = ll_encode_fh,
+ .decode_fh = ll_decode_fh,
+};
git://git.whamcloud.com / fs / lustre-release.git / blobdiff