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);
72 struct ptlrpc_request *request;
73 struct lustre_handle lockh;
74 struct mdt_body *body;
75 struct lookup_intent it = { .it_op = IT_READDIR };
76 struct md_op_data op_data;
77 struct obd_device *obddev = class_exp2obd(sbi->ll_md_exp);
78 struct ldlm_res_id res_id =
79 { .name = {fid_seq(&lli->lli_fid),
80 fid_oid(&lli->lli_fid),
81 fid_ver(&lli->lli_fid)} };
82 ldlm_policy_data_t policy = { .l_inodebits = { MDS_INODELOCK_UPDATE } };
85 rc = ldlm_lock_match(obddev->obd_namespace, LDLM_FL_BLOCK_GRANTED,
86 &res_id, LDLM_IBITS, &policy, LCK_CR, &lockh);
88 struct ldlm_enqueue_info einfo = {LDLM_IBITS, LCK_CR,
89 llu_md_blocking_ast, ldlm_completion_ast, NULL, inode};
91 llu_prep_md_op_data(&op_data, inode, NULL, NULL, 0, 0,
94 rc = md_enqueue(sbi->ll_md_exp, &einfo, &it,
95 &op_data, &lockh, NULL, 0,
96 LDLM_FL_CANCEL_ON_BLOCK);
97 request = (struct ptlrpc_request *)it.d.lustre.it_data;
99 ptlrpc_req_finished(request);
101 CERROR("lock enqueue: err: %d\n", rc);
105 ldlm_lock_dump_handle(D_OTHER, &lockh);
107 offset = (__u64)page->index << CFS_PAGE_SHIFT;
108 rc = md_readpage(sbi->ll_md_exp, &lli->lli_fid, NULL,
109 offset, page, &request);
111 body = lustre_msg_buf(request->rq_repmsg, REPLY_REC_OFF,
113 LASSERT(body != NULL); /* checked by md_readpage() */
114 /* swabbed by md_readpage() */
115 LASSERT(lustre_rep_swabbed(request, REPLY_REC_OFF));
117 st->st_size = body->size;
119 CERROR("read_dir_page(%ld) error %d\n", page->index, rc);
121 ptlrpc_req_finished(request);
124 ldlm_lock_decref(&lockh, LCK_CR);
128 static struct page *llu_dir_read_page(struct inode *ino, unsigned long pgidx)
134 page = cfs_alloc_page(0);
136 CERROR("alloc page failed\n");
137 RETURN(ERR_PTR(-ENOMEM));
141 rc = llu_dir_do_readpage(ino, page);
162 static unsigned char ext2_filetype_table[EXT2_FT_MAX] = {
163 [EXT2_FT_UNKNOWN] DT_UNKNOWN,
164 [EXT2_FT_REG_FILE] DT_REG,
165 [EXT2_FT_DIR] DT_DIR,
166 [EXT2_FT_CHRDEV] DT_CHR,
167 [EXT2_FT_BLKDEV] DT_BLK,
168 [EXT2_FT_FIFO] DT_FIFO,
169 [EXT2_FT_SOCK] DT_SOCK,
170 [EXT2_FT_SYMLINK] DT_LNK,
173 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char *) (de)))
174 #define ROUND_UP64(x) (((x)+sizeof(__u64)-1) & ~(sizeof(__u64)-1))
176 static int filldir(char *buf, int buflen,
177 const char *name, int namelen, loff_t offset,
178 ino_t ino, unsigned int d_type, int *filled)
180 struct dirent64 *dirent = (struct dirent64 *) (buf + *filled);
181 int reclen = ROUND_UP64(NAME_OFFSET(dirent) + namelen + 1);
184 if ((*filled + reclen) > buflen)
188 dirent->d_off = offset;
189 dirent->d_reclen = reclen;
191 dirent->d_type = (unsigned short) d_type;
193 memcpy(dirent->d_name, name, namelen);
194 dirent->d_name[namelen] = 0;
201 ssize_t llu_iop_filldirentries(struct inode *ino, _SYSIO_OFF_T *basep,
202 char *buf, size_t nbytes)
204 struct llu_inode_info *lli = llu_i2info(ino);
205 struct intnl_stat *st = llu_i2stat(ino);
206 loff_t pos = *basep, offset;
207 unsigned long maxpages, pgidx;
211 liblustre_wait_event(0);
213 if (st->st_size == 0) {
214 CWARN("dir size is 0?\n");
219 pos = lli->lli_dir_pos;
221 maxpages = (st->st_size + CFS_PAGE_SIZE - 1) >> CFS_PAGE_SHIFT;
222 pgidx = pos >> CFS_PAGE_SHIFT;
223 offset = pos & ~CFS_PAGE_MASK;
225 for ( ; pgidx < maxpages ; pgidx++, offset = 0) {
227 struct ext2_dirent *de;
230 page = llu_dir_read_page(ino, pgidx);
234 /* size might have been updated by md_readpage */
235 maxpages = (st->st_size + CFS_PAGE_SIZE - 1) >> CFS_PAGE_SHIFT;
239 limit = addr + CFS_PAGE_SIZE - EXT2_DIR_REC_LEN(1);
240 de = (struct ext2_dirent *) (addr + offset);
242 for ( ; (char*) de <= limit; de = ext2_next_entry(de)) {
245 unsigned char d_type = DT_UNKNOWN;
247 if (de->file_type < EXT2_FT_MAX)
248 d_type = ext2_filetype_table[de->file_type];
250 offset = (char*) de - addr;
251 over = filldir(buf, nbytes, de->name, de->name_len,
252 (((__u64)pgidx << PAGE_SHIFT) | offset) +
253 le16_to_cpu(de->rec_len),
254 le32_to_cpu(de->inode), d_type, &filled);
258 * if buffer overflow with no data
259 * returned yet, then report error
272 lli->lli_dir_pos = pgidx << CFS_PAGE_SHIFT | offset;
273 *basep = lli->lli_dir_pos;
274 liblustre_wait_event(0);