1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Lustre Light directory handling
6 * Copyright (c) 2002, 2003 Cluster File Systems, Inc.
8 * This file is part of Lustre, http://www.lustre.org.
10 * Lustre is free software; you can redistribute it and/or
11 * modify it under the terms of version 2 of the GNU General Public
12 * License as published by the Free Software Foundation.
14 * Lustre is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with Lustre; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #define DEBUG_SUBSYSTEM S_LLITE
31 #include <sys/types.h>
33 #include <sys/fcntl.h>
34 #include <sys/queue.h>
44 #include <linux/types.h>
45 #include <linux/dirent.h>
46 #include <linux/unistd.h>
48 #include "llite_lib.h"
50 static int llu_dir_do_readpage(struct inode *inode, struct page *page)
52 struct llu_inode_info *lli = llu_i2info(inode);
53 struct llu_sb_info *sbi = llu_i2sbi(inode);
54 struct ll_fid mdc_fid;
57 struct ptlrpc_request *request;
58 struct lustre_handle lockh;
59 struct mds_body *body;
60 struct lookup_intent it = { .it_op = IT_READDIR };
61 struct mdc_op_data data;
62 struct obd_device *obddev = class_exp2obd(sbi->ll_mdc_exp);
63 struct ldlm_res_id res_id =
64 { .name = {lli->lli_st_ino, (__u64)lli->lli_st_generation} };
65 ldlm_policy_data_t policy = { .l_inodebits = { MDS_INODELOCK_UPDATE } };
68 if ((lli->lli_st_size + PAGE_CACHE_SIZE - 1) >> PAGE_SHIFT <= page->index) {
69 /* XXX why do we need this exactly, and why do we think that
70 * an all-zero directory page is useful?
72 CERROR("memsetting dir page %lu to zero (size %lld)\n",
73 page->index, lli->lli_st_size);
74 memset(page->addr, 0, PAGE_CACHE_SIZE);
75 GOTO(readpage_out, rc);
78 rc = ldlm_lock_match(obddev->obd_namespace, LDLM_FL_BLOCK_GRANTED,
79 &res_id, LDLM_IBITS, &policy, LCK_PR, &lockh);
81 llu_prepare_mdc_op_data(&data, inode, NULL, NULL, 0, 0);
83 rc = mdc_enqueue(sbi->ll_mdc_exp, LDLM_IBITS, &it, LCK_PR,
84 &data, &lockh, NULL, 0,
85 ldlm_completion_ast, llu_mdc_blocking_ast,
87 request = (struct ptlrpc_request *)it.d.lustre.it_data;
89 ptlrpc_req_finished(request);
91 CERROR("lock enqueue: err: %d\n", rc);
95 ldlm_lock_dump_handle(D_OTHER, &lockh);
97 mdc_pack_fid(&mdc_fid, lli->lli_st_ino, lli->lli_st_generation, S_IFDIR);
99 offset = page->index << PAGE_SHIFT;
100 rc = mdc_readpage(sbi->ll_mdc_exp, &mdc_fid,
101 offset, page, &request);
103 body = lustre_msg_buf(request->rq_repmsg, 0, sizeof (*body));
104 LASSERT (body != NULL); /* checked by mdc_readpage() */
105 LASSERT_REPSWABBED (request, 0); /* swabbed by mdc_readpage() */
107 lli->lli_st_size = body->size;
109 ptlrpc_req_finished(request);
113 ldlm_lock_decref(&lockh, LCK_PR);
117 static struct page *llu_dir_read_page(struct inode *ino, int pgidx)
123 page = alloc_page(0);
125 CERROR("alloc page failed\n");
126 RETURN(ERR_PTR(-ENOMEM));
130 rc = llu_dir_do_readpage(ino, page);
139 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char *) (de)))
140 #define ROUND_UP64(x) (((x)+sizeof(__u64)-1) & ~(sizeof(__u64)-1))
142 static int filldir(char *buf, int buflen,
143 const char *name, int namelen, loff_t offset,
144 ino_t ino, unsigned int d_type, int *filled)
146 struct dirent64 *dirent = (struct dirent64 *) (buf + *filled);
147 int reclen = ROUND_UP64(NAME_OFFSET(dirent) + namelen + 1);
150 if ((*filled + reclen) > buflen)
154 dirent->d_off = offset,
155 dirent->d_reclen = reclen;
156 dirent->d_type = (unsigned short) d_type;
157 memcpy(dirent->d_name, name, namelen);
158 dirent->d_name[namelen] = 0;
165 ssize_t llu_iop_getdirentries(struct inode *ino, char *buf, size_t nbytes,
168 struct llu_inode_info *lli = llu_i2info(ino);
169 loff_t pos = *basep, offset;
170 int maxpages, pgidx, filled = 0;
174 pos = lli->lli_dir_pos;
176 maxpages = lli->lli_st_size >> PAGE_CACHE_SHIFT;
177 pgidx = pos >> PAGE_CACHE_SHIFT;
178 offset = pos & ~PAGE_CACHE_MASK;
180 for ( ; pgidx < maxpages ; pgidx++, offset = 0) {
182 struct ext2_dirent *de;
185 page = llu_dir_read_page(ino, pgidx);
189 /* size might have been updated by mdc_readpage */
190 maxpages = lli->lli_st_size >> PAGE_CACHE_SHIFT;
194 limit = addr + PAGE_CACHE_SIZE - EXT2_DIR_REC_LEN(1);
195 de = (struct ext2_dirent *) (addr + offset);
197 for ( ; (char*) de <= limit; de = ext2_next_entry(de)) {
200 unsigned char d_type = 0;
202 /* XXX handle type, etc here */
204 offset = (char*) de - addr;
205 over = filldir(buf, nbytes, de->name, de->name_len,
206 (pgidx << PAGE_CACHE_SHIFT) | offset,
207 le32_to_cpu(de->inode), d_type, &filled);
218 lli->lli_dir_pos = pgidx << PAGE_CACHE_SHIFT | offset;
219 *basep = lli->lli_dir_pos;