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>
34 #include <sys/queue.h>
49 #ifdef HAVE_ASM_TYPES_H
50 #include <asm/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} };
81 ldlm_policy_data_t policy = { .l_inodebits = { MDS_INODELOCK_UPDATE } };
84 rc = ldlm_lock_match(obddev->obd_namespace, LDLM_FL_BLOCK_GRANTED,
85 &res_id, LDLM_IBITS, &policy, LCK_CR, &lockh);
87 llu_prepare_mdc_op_data(&data, inode, NULL, NULL, 0, 0);
89 rc = mdc_enqueue(sbi->ll_mdc_exp, LDLM_IBITS, &it, LCK_CR,
90 &data, &lockh, NULL, 0,
91 ldlm_completion_ast, llu_mdc_blocking_ast,
92 inode, LDLM_FL_CANCEL_ON_BLOCK);
93 request = (struct ptlrpc_request *)it.d.lustre.it_data;
95 ptlrpc_req_finished(request);
97 CERROR("lock enqueue: err: %d\n", rc);
101 ldlm_lock_dump_handle(D_OTHER, &lockh);
103 mdc_pack_fid(&mdc_fid, st->st_ino, lli->lli_st_generation, S_IFDIR);
105 offset = (__u64)page->index << CFS_PAGE_SHIFT;
106 rc = mdc_readpage(sbi->ll_mdc_exp, &mdc_fid,
107 offset, page, &request);
109 body = lustre_msg_buf(request->rq_repmsg, REPLY_REC_OFF,
111 LASSERT(body != NULL); /* checked by mdc_readpage() */
112 /* swabbed by mdc_readpage() */
113 LASSERT_REPSWABBED(request, REPLY_REC_OFF);
115 st->st_size = body->size;
117 CERROR("read_dir_page(%ld) error %d\n", page->index, rc);
119 ptlrpc_req_finished(request);
122 ldlm_lock_decref(&lockh, LCK_CR);
126 static struct page *llu_dir_read_page(struct inode *ino, unsigned long pgidx)
132 page = alloc_page(0);
134 CERROR("alloc page failed\n");
135 RETURN(ERR_PTR(-ENOMEM));
139 rc = llu_dir_do_readpage(ino, page);
160 static unsigned char ext2_filetype_table[EXT2_FT_MAX] = {
161 [EXT2_FT_UNKNOWN] DT_UNKNOWN,
162 [EXT2_FT_REG_FILE] DT_REG,
163 [EXT2_FT_DIR] DT_DIR,
164 [EXT2_FT_CHRDEV] DT_CHR,
165 [EXT2_FT_BLKDEV] DT_BLK,
166 [EXT2_FT_FIFO] DT_FIFO,
167 [EXT2_FT_SOCK] DT_SOCK,
168 [EXT2_FT_SYMLINK] DT_LNK,
171 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char *) (de)))
172 #define ROUND_UP64(x) (((x)+sizeof(__u64)-1) & ~(sizeof(__u64)-1))
174 static int filldir(char *buf, int buflen,
175 const char *name, int namelen, loff_t offset,
176 ino_t ino, unsigned int d_type, int *filled)
178 struct dirent64 *dirent = (struct dirent64 *) (buf + *filled);
179 int reclen = ROUND_UP64(NAME_OFFSET(dirent) + namelen + 1);
182 if ((*filled + reclen) > buflen)
186 dirent->d_off = offset;
187 dirent->d_reclen = reclen;
189 dirent->d_type = (unsigned short) d_type;
191 memcpy(dirent->d_name, name, namelen);
192 dirent->d_name[namelen] = 0;
199 ssize_t llu_iop_filldirentries(struct inode *ino, _SYSIO_OFF_T *basep,
200 char *buf, size_t nbytes)
202 struct llu_inode_info *lli = llu_i2info(ino);
203 struct intnl_stat *st = llu_i2stat(ino);
204 loff_t pos = *basep, offset;
206 unsigned long pgidx, maxpages;
209 liblustre_wait_event(0);
211 if (st->st_size == 0) {
212 CWARN("dir size is 0?\n");
217 pos = lli->lli_dir_pos;
219 maxpages = (st->st_size + CFS_PAGE_SIZE - 1) >> CFS_PAGE_SHIFT;
220 pgidx = pos >> CFS_PAGE_SHIFT;
221 offset = pos & ~CFS_PAGE_MASK;
223 for ( ; pgidx < maxpages ; pgidx++, offset = 0) {
225 struct ext2_dirent *de;
228 page = llu_dir_read_page(ino, pgidx);
232 /* size might have been updated by mdc_readpage */
233 maxpages = (st->st_size + CFS_PAGE_SIZE - 1) >> CFS_PAGE_SHIFT;
237 limit = addr + CFS_PAGE_SIZE - EXT2_DIR_REC_LEN(1);
238 de = (struct ext2_dirent *) (addr + offset);
240 for ( ; (char*) de <= limit; de = ext2_next_entry(de)) {
243 unsigned char d_type = DT_UNKNOWN;
245 if (de->file_type < EXT2_FT_MAX)
246 d_type = ext2_filetype_table[de->file_type];
248 offset = (char*) de - addr;
249 over = filldir(buf, nbytes, de->name, de->name_len,
250 (((__u64)pgidx << CFS_PAGE_SHIFT) | offset)
251 + le16_to_cpu(de->rec_len),
252 le32_to_cpu(de->inode), d_type, &filled);
263 lli->lli_dir_pos = (__u64)pgidx << CFS_PAGE_SHIFT | offset;
264 *basep = lli->lli_dir_pos;
265 liblustre_wait_event(0);