+++ /dev/null
-/*
- * 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) 2004, 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/liblustre/dir.c
- *
- * Lustre Light directory handling
- */
-
-#define DEBUG_SUBSYSTEM S_LLITE
-
-#include <errno.h>
-#include <stddef.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <libcfs/libcfs.h>
-#include <lustre/lustre_idl.h>
-#include <liblustre.h>
-#include <lclient.h>
-#include <lustre_dlm.h>
-#include <lustre_lite.h>
-#include <lustre_net.h>
-#include <lustre_req_layout.h>
-#include <obd.h>
-#include <obd_class.h>
-#include <obd_support.h>
-#include "llite_lib.h"
-#include <dirent.h>
-
-/* (new) readdir implementation overview can be found in lustre/llite/dir.c */
-static int llu_dir_do_readpage(struct inode *inode, struct page *page)
-{
- struct llu_inode_info *lli = llu_i2info(inode);
- struct intnl_stat *st = llu_i2stat(inode);
- struct llu_sb_info *sbi = llu_i2sbi(inode);
- struct ptlrpc_request *request;
- struct lustre_handle lockh;
- struct mdt_body *body;
- struct lookup_intent it = { .it_op = IT_READDIR };
- struct md_op_data op_data = {{ 0 }};
- ldlm_policy_data_t policy = { .l_inodebits = { MDS_INODELOCK_UPDATE } };
- int rc = 0;
- ENTRY;
-
- llu_prep_md_op_data(&op_data, inode, NULL, NULL, 0, 0, LUSTRE_OPC_ANY);
- rc = md_lock_match(sbi->ll_md_exp, LDLM_FL_BLOCK_GRANTED,
- &lli->lli_fid, LDLM_IBITS, &policy, LCK_CR, &lockh);
- if (!rc) {
- struct ldlm_enqueue_info einfo = {
- .ei_type = LDLM_IBITS,
- .ei_mode = LCK_CR,
- .ei_cb_bl = llu_md_blocking_ast,
- .ei_cb_cp = ldlm_completion_ast,
- .ei_cbdata = inode,
- };
-
- rc = md_enqueue(sbi->ll_md_exp, &einfo, NULL, &it, &op_data,
- &lockh, LDLM_FL_CANCEL_ON_BLOCK);
- request = (struct ptlrpc_request *)it.d.lustre.it_data;
- if (request)
- ptlrpc_req_finished(request);
- if (rc < 0) {
- CERROR("lock enqueue: err: %d\n", rc);
- RETURN(rc);
- }
- }
- ldlm_lock_dump_handle(D_OTHER, &lockh);
-
- op_data.op_npages = 1;
- rc = md_readpage(sbi->ll_md_exp, &op_data, &page, &request);
- if (!rc) {
- body = req_capsule_server_get(&request->rq_pill, &RMF_MDT_BODY);
- LASSERT(body != NULL); /* checked by md_readpage() */
-
- if (body->valid & OBD_MD_FLSIZE)
- st->st_size = body->size;
- } else {
- CERROR("read_dir_page(%ld) error %d\n", page->index, rc);
- }
- ptlrpc_req_finished(request);
- EXIT;
-
- ldlm_lock_decref(&lockh, LCK_CR);
- return rc;
-}
-
-static struct page *llu_dir_read_page(struct inode *ino, __u64 hash,
- int exact, struct ll_dir_chain *chain)
-{
- struct page *page;
- int rc;
- ENTRY;
-
- OBD_PAGE_ALLOC(page, 0);
- if (!page)
- RETURN(ERR_PTR(-ENOMEM));
- page->index = hash_x_index(hash, 0);
-
- rc = llu_dir_do_readpage(ino, page);
- if (rc) {
- OBD_PAGE_FREE(page);
- RETURN(ERR_PTR(rc));
- }
-
- return page;
-}
-
-static void *(*memmover)(void *, const void *, size_t) = memmove;
-
-#define NAME_OFFSET(de) ((int) ((de)->d_name - (char *) (de)))
-#define ROUND_UP64(x) (((x)+sizeof(__u64)-1) & ~(sizeof(__u64)-1))
-static int filldir(char *buf, int buflen, const char *name, int namelen,
- loff_t offset, ino_t ino, unsigned int d_type, int *filled)
-{
- struct intnl_dirent *dirent = (struct intnl_dirent *)(buf + *filled);
- struct intnl_dirent holder;
- int reclen = ROUND_UP64(NAME_OFFSET(dirent) + namelen + 1);
-
- /*
- * @buf is not guaranteed to be properly aligned. To work around,
- * first fill stack-allocated @holder, then copy @holder into @buf by
- * memmove().
- */
-
- /* check overflow */
- if ((*filled + reclen) > buflen)
- return 1;
-
- holder.d_ino = ino;
-#ifdef _DIRENT_HAVE_D_OFF
- holder.d_off = offset;
-#endif
- holder.d_reclen = reclen;
-#ifdef _DIRENT_HAVE_D_TYPE
- holder.d_type = (unsigned short) d_type;
-#endif
- /* gcc unrolls memcpy() of structs into field-wise assignments,
- * assuming proper alignment. Humor it. */
- (*memmover)(dirent, &holder, NAME_OFFSET(dirent));
- memcpy(dirent->d_name, name, namelen);
- dirent->d_name[namelen] = 0;
-
- *filled += reclen;
-
- return 0;
-}
-
-/*
- * TODO: much of the code here is similar/identical to llite ll_readdir().
- * These code can be factored out and shared in a common module.
- */
-
-ssize_t llu_iop_filldirentries(struct inode *dir, _SYSIO_OFF_T *basep,
- char *buf, size_t nbytes)
-{
- struct llu_inode_info *lli = llu_i2info(dir);
- struct intnl_stat *st = llu_i2stat(dir);
- loff_t pos = *basep;
- struct ll_dir_chain chain;
- struct page *page;
- int filled = 0;
- int rc;
- int done;
- __u16 type;
- ENTRY;
-
- liblustre_wait_event(0);
-
- if (st->st_size == 0) {
- CWARN("dir size is 0?\n");
- RETURN(0);
- }
-
- if (pos == MDS_DIR_END_OFF)
- /*
- * end-of-file.
- */
- RETURN(0);
-
- rc = 0;
- done = 0;
- ll_dir_chain_init(&chain);
-
- page = llu_dir_read_page(dir, pos, 0, &chain);
- while (rc == 0 && !done) {
- struct lu_dirpage *dp;
- struct lu_dirent *ent;
-
- if (!IS_ERR(page)) {
- /*
- * If page is empty (end of directoryis reached),
- * use this value.
- */
- __u64 hash = MDS_DIR_END_OFF;
- __u64 next;
-
- dp = page->addr;
- for (ent = lu_dirent_start(dp); ent != NULL && !done;
- ent = lu_dirent_next(ent)) {
- char *name;
- int namelen;
- struct lu_fid fid;
- __u64 ino;
-
- hash = le64_to_cpu(ent->lde_hash);
- namelen = le16_to_cpu(ent->lde_namelen);
-
- if (hash < pos)
- /*
- * Skip until we find target hash
- * value.
- */
- continue;
-
- if (namelen == 0)
- /*
- * Skip dummy record.
- */
- continue;
-
- fid = ent->lde_fid;
- name = ent->lde_name;
- fid_le_to_cpu(&fid, &fid);
- ino = cl_fid_build_ino(&fid, 0);
- type = ll_dirent_type_get(ent);
- done = filldir(buf, nbytes, name, namelen,
- (loff_t)hash, ino, type,
- &filled);
- }
- next = le64_to_cpu(dp->ldp_hash_end);
- OBD_PAGE_FREE(page);
- if (!done) {
- pos = next;
- if (pos == MDS_DIR_END_OFF)
- /*
- * End of directory reached.
- */
- done = 1;
- else if (1 /* chain is exhausted*/)
- /*
- * Normal case: continue to the next
- * page.
- */
- page = llu_dir_read_page(dir, pos, 1,
- &chain);
- else {
- /*
- * go into overflow page.
- */
- }
- } else {
- pos = hash;
- if (filled == 0)
- GOTO(out, filled = -EINVAL);
- }
- } else {
- rc = PTR_ERR(page);
- CERROR("error reading dir "DFID" at %lu: rc %d\n",
- PFID(&lli->lli_fid), (unsigned long)pos, rc);
- }
- }
- lli->lli_dir_pos = (loff_t)pos;
- *basep = lli->lli_dir_pos;
-out:
- ll_dir_chain_fini(&chain);
- liblustre_wait_event(0);
- RETURN(filled);
-}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff