--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
+ *
+ * Lustre Light Super operations
+ *
+ * Copyright (c) 2002, 2003 Cluster File Systems, Inc.
+ *
+ * This file is part of Lustre, http://www.lustre.org.
+ *
+ * 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.
+ *
+ * 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
+ * along with Lustre; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define DEBUG_SUBSYSTEM S_LLITE
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/fcntl.h>
+#include <sys/queue.h>
+
+#include <sysio.h>
+#include <fs.h>
+#include <mount.h>
+#include <inode.h>
+#include <file.h>
+
+#undef LIST_HEAD
+
+#include <linux/types.h>
+#include <linux/dirent.h>
+#include <linux/unistd.h>
+
+#include "llite_lib.h"
+
+static int llu_dir_do_readpage(struct inode *inode, struct page *page)
+{
+ struct llu_inode_info *lli = llu_i2info(inode);
+ struct llu_sb_info *sbi = llu_i2sbi(inode);
+ struct ll_fid mdc_fid;
+ __u64 offset;
+ int rc = 0;
+ struct ptlrpc_request *request;
+ struct lustre_handle lockh;
+ struct mds_body *body;
+ struct lookup_intent it = { .it_op = IT_READDIR };
+ struct mdc_op_data data;
+ struct obd_device *obddev = class_exp2obd(sbi->ll_mdc_exp);
+ struct ldlm_res_id res_id =
+ { .name = {lli->lli_st_ino, (__u64)lli->lli_st_generation} };
+ ENTRY;
+
+ if ((lli->lli_st_size + PAGE_CACHE_SIZE - 1) >> PAGE_SHIFT <= page->index) {
+ /* XXX why do we need this exactly, and why do we think that
+ * an all-zero directory page is useful?
+ */
+ CERROR("memsetting dir page %lu to zero (size %lld)\n",
+ page->index, lli->lli_st_size);
+ memset(page->addr, 0, PAGE_CACHE_SIZE);
+ GOTO(readpage_out, rc);
+ }
+
+ rc = ldlm_lock_match(obddev->obd_namespace, LDLM_FL_BLOCK_GRANTED,
+ &res_id, LDLM_PLAIN, NULL, 0, LCK_PR, &lockh);
+ if (!rc) {
+ llu_prepare_mdc_op_data(&data, inode, NULL, NULL, 0, 0);
+
+ rc = mdc_enqueue(sbi->ll_mdc_exp, LDLM_PLAIN, &it, LCK_PR,
+ &data, &lockh, NULL, 0,
+ ldlm_completion_ast, llu_mdc_blocking_ast,
+ inode);
+ 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);
+
+ mdc_pack_fid(&mdc_fid, lli->lli_st_ino, lli->lli_st_generation, S_IFDIR);
+
+ offset = page->index << PAGE_SHIFT;
+ rc = mdc_readpage(sbi->ll_mdc_exp, &mdc_fid,
+ offset, page, &request);
+ if (!rc) {
+ body = lustre_msg_buf(request->rq_repmsg, 0, sizeof (*body));
+ LASSERT (body != NULL); /* checked by mdc_readpage() */
+ LASSERT_REPSWABBED (request, 0); /* swabbed by mdc_readpage() */
+
+ lli->lli_st_size = body->size;
+ }
+ ptlrpc_req_finished(request);
+ EXIT;
+
+ readpage_out:
+ ldlm_lock_decref(&lockh, LCK_PR);
+ return rc;
+}
+
+static struct page *llu_dir_read_page(struct inode *ino, int pgidx)
+{
+ struct page *page;
+ int rc;
+ ENTRY;
+
+ page = alloc_page(0);
+ if (!page) {
+ CERROR("alloc page failed\n");
+ RETURN(ERR_PTR(-ENOMEM));
+ }
+ page->index = pgidx;
+
+ rc = llu_dir_do_readpage(ino, page);
+ if (rc) {
+ free_page(page);
+ RETURN(ERR_PTR(rc));
+ }
+
+ return page;
+}
+
+#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 dirent64 *dirent = (struct dirent64 *) (buf + *filled);
+ int reclen = ROUND_UP64(NAME_OFFSET(dirent) + namelen + 1);
+
+ /* check overflow */
+ if ((*filled + reclen) > buflen)
+ return 1;
+
+ dirent->d_ino = ino;
+ dirent->d_off = offset,
+ dirent->d_reclen = reclen;
+ dirent->d_type = (unsigned short) d_type;
+ memcpy(dirent->d_name, name, namelen);
+ dirent->d_name[namelen] = 0;
+
+ *filled += reclen;
+
+ return 0;
+}
+
+ssize_t llu_iop_getdirentries(struct inode *ino, char *buf, size_t nbytes,
+ _SYSIO_OFF_T *basep)
+{
+ struct llu_inode_info *lli = llu_i2info(ino);
+ loff_t pos = *basep, offset;
+ int maxpages, pgidx, filled = 0;
+ ENTRY;
+
+ if (pos == -1)
+ pos = lli->lli_dir_pos;
+
+ maxpages = lli->lli_st_size >> PAGE_CACHE_SHIFT;
+ pgidx = pos >> PAGE_CACHE_SHIFT;
+ offset = pos & ~PAGE_CACHE_MASK;
+
+ for ( ; pgidx < maxpages ; pgidx++, offset = 0) {
+ struct page *page;
+ struct ext2_dirent *de;
+ char *addr, *limit;
+
+ page = llu_dir_read_page(ino, pgidx);
+ if (IS_ERR(page))
+ continue;
+
+ /* size might have been updated by mdc_readpage */
+ maxpages = lli->lli_st_size >> PAGE_CACHE_SHIFT;
+
+ /* fill in buffer */
+ addr = page->addr;
+ limit = addr + PAGE_CACHE_SIZE - EXT2_DIR_REC_LEN(1);
+ de = (struct ext2_dirent *) (addr + offset);
+
+ for ( ; (char*) de <= limit; de = ext2_next_entry(de)) {
+ if (de->inode) {
+ int over;
+ unsigned char d_type = 0;
+
+ /* XXX handle type, etc here */
+
+ offset = (char*) de - addr;
+ over = filldir(buf, nbytes, de->name, de->name_len,
+ (pgidx << PAGE_CACHE_SHIFT) | offset,
+ le32_to_cpu(de->inode), d_type, &filled);
+ if (over) {
+ free_page(page);
+ GOTO(done, 0);
+ }
+ }
+ }
+
+ free_page(page);
+ }
+done:
+ lli->lli_dir_pos += pgidx << PAGE_CACHE_SHIFT | offset;
+ *basep = lli->lli_dir_pos;
+ RETURN(filled);
+}
git://git.whamcloud.com / fs / lustre-release.git / commitdiff