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) 2002-2004 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>
49 #ifdef HAVE_LINUX_TYPES_H
50 #include <linux/types.h>
51 #elif defined(HAVE_SYS_TYPES_H)
52 #include <sys/types.h>
55 #ifdef HAVE_LINUX_UNISTD_H
56 #include <linux/unistd.h>
57 #elif defined(HAVE_UNISTD_H)
63 #include "llite_lib.h"
65 static int llu_dir_do_readpage(struct inode *inode, struct page *page)
67 struct llu_inode_info *lli = llu_i2info(inode);
68 struct intnl_stat *st = llu_i2stat(inode);
69 struct llu_sb_info *sbi = llu_i2sbi(inode);
70 struct ll_fid mdc_fid;
73 struct ptlrpc_request *request;
74 struct lustre_handle lockh;
75 struct mds_body *body;
76 struct lookup_intent it = { .it_op = IT_READDIR };
77 struct mdc_op_data data;
78 struct obd_device *obddev = class_exp2obd(sbi->ll_mdc_exp);
79 struct ldlm_res_id res_id =
80 { .name = {st->st_ino, (__u64)lli->lli_st_generation} };
83 rc = ldlm_lock_match(obddev->obd_namespace, LDLM_FL_BLOCK_GRANTED,
84 &res_id, LDLM_PLAIN, NULL, LCK_PR, &lockh);
86 llu_prepare_mdc_op_data(&data, inode, NULL, NULL, 0, 0);
88 rc = mdc_enqueue(sbi->ll_mdc_exp, LDLM_PLAIN, &it, LCK_PR,
89 &data, &lockh, NULL, 0,
90 ldlm_completion_ast, llu_mdc_blocking_ast,
92 request = (struct ptlrpc_request *)it.d.lustre.it_data;
94 ptlrpc_req_finished(request);
96 CERROR("lock enqueue: err: %d\n", rc);
100 ldlm_lock_dump_handle(D_OTHER, &lockh);
102 mdc_pack_fid(&mdc_fid, st->st_ino, lli->lli_st_generation, S_IFDIR);
104 offset = page->index << PAGE_SHIFT;
105 rc = mdc_readpage(sbi->ll_mdc_exp, &mdc_fid,
106 offset, page, &request);
108 body = lustre_msg_buf(request->rq_repmsg, 0, sizeof (*body));
109 LASSERT (body != NULL); /* checked by mdc_readpage() */
110 LASSERT_REPSWABBED (request, 0); /* swabbed by mdc_readpage() */
112 st->st_size = body->size;
114 CERROR("read_dir_page(%ld) error %d\n", page->index, rc);
116 ptlrpc_req_finished(request);
119 ldlm_lock_decref(&lockh, LCK_PR);
123 static struct page *llu_dir_read_page(struct inode *ino, int pgidx)
129 page = alloc_page(0);
131 CERROR("alloc page failed\n");
132 RETURN(ERR_PTR(-ENOMEM));
136 rc = llu_dir_do_readpage(ino, page);
157 static unsigned char ext2_filetype_table[EXT2_FT_MAX] = {
158 [EXT2_FT_UNKNOWN] DT_UNKNOWN,
159 [EXT2_FT_REG_FILE] DT_REG,
160 [EXT2_FT_DIR] DT_DIR,
161 [EXT2_FT_CHRDEV] DT_CHR,
162 [EXT2_FT_BLKDEV] DT_BLK,
163 [EXT2_FT_FIFO] DT_FIFO,
164 [EXT2_FT_SOCK] DT_SOCK,
165 [EXT2_FT_SYMLINK] DT_LNK,
168 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char *) (de)))
169 #define ROUND_UP64(x) (((x)+sizeof(__u64)-1) & ~(sizeof(__u64)-1))
171 static int filldir(char *buf, int buflen,
172 const char *name, int namelen, loff_t offset,
173 ino_t ino, unsigned int d_type, int *filled)
175 struct dirent64 *dirent = (struct dirent64 *) (buf + *filled);
176 int reclen = ROUND_UP64(NAME_OFFSET(dirent) + namelen + 1);
179 if ((*filled + reclen) > buflen)
183 dirent->d_off = offset;
184 dirent->d_reclen = reclen;
185 dirent->d_type = (unsigned short) d_type;
186 memcpy(dirent->d_name, name, namelen);
187 dirent->d_name[namelen] = 0;
194 ssize_t llu_iop_getdirentries(struct inode *ino, char *buf, size_t nbytes,
197 struct llu_inode_info *lli = llu_i2info(ino);
198 struct intnl_stat *st = llu_i2stat(ino);
199 loff_t pos = *basep, offset;
200 int maxpages, pgidx, filled = 0;
203 if (st->st_size == 0) {
204 CWARN("dir size is 0?\n");
208 liblustre_wait_event(0);
211 pos = lli->lli_dir_pos;
213 maxpages = (st->st_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
214 pgidx = pos >> PAGE_SHIFT;
215 offset = pos & ~PAGE_MASK;
217 for ( ; pgidx < maxpages ; pgidx++, offset = 0) {
219 struct ext2_dirent *de;
222 page = llu_dir_read_page(ino, pgidx);
226 /* size might have been updated by mdc_readpage */
227 maxpages = (st->st_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
231 limit = addr + PAGE_SIZE - EXT2_DIR_REC_LEN(1);
232 de = (struct ext2_dirent *) (addr + offset);
234 for ( ; (char*) de <= limit; de = ext2_next_entry(de)) {
237 unsigned char d_type = DT_UNKNOWN;
239 if (de->file_type < EXT2_FT_MAX)
240 d_type = ext2_filetype_table[de->file_type];
242 offset = (char*) de - addr;
243 over = filldir(buf, nbytes, de->name, de->name_len,
244 ((pgidx << PAGE_SHIFT) | offset) + le16_to_cpu(de->rec_len),
245 le32_to_cpu(de->inode), d_type, &filled);
256 lli->lli_dir_pos = pgidx << PAGE_SHIFT | offset;
257 *basep = lli->lli_dir_pos;