/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * * Lustre Light directory handling * * Copyright (c) 2002-2004 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 #include #include #include #include #include #include #include #include #ifdef HAVE_XTIO_H #include #endif #include #include #include #include #ifdef HAVE_FILE_H #include #endif #undef LIST_HEAD #ifdef HAVE_ASM_TYPES_H #include #elif defined(HAVE_SYS_TYPES_H) #include #endif #ifdef HAVE_LINUX_UNISTD_H #include #elif defined(HAVE_UNISTD_H) #include #endif #include #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 intnl_stat *st = llu_i2stat(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 = {st->st_ino, (__u64)lli->lli_st_generation} }; ldlm_policy_data_t policy = { .l_inodebits = { MDS_INODELOCK_UPDATE } }; ENTRY; rc = ldlm_lock_match(obddev->obd_namespace, LDLM_FL_BLOCK_GRANTED, &res_id, LDLM_IBITS, &policy, LCK_CR, &lockh); if (!rc) { llu_prepare_mdc_op_data(&data, inode, NULL, NULL, 0, 0); rc = mdc_enqueue(sbi->ll_mdc_exp, LDLM_IBITS, &it, LCK_CR, &data, &lockh, NULL, 0, ldlm_completion_ast, llu_mdc_blocking_ast, inode, LDLM_FL_CANCEL_ON_BLOCK); 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, st->st_ino, lli->lli_st_generation, S_IFDIR); offset = (__u64)page->index << CFS_PAGE_SHIFT; rc = mdc_readpage(sbi->ll_mdc_exp, &mdc_fid, offset, page, &request); if (!rc) { body = lustre_msg_buf(request->rq_repmsg, REPLY_REC_OFF, sizeof(*body)); LASSERT(body != NULL); /* checked by mdc_readpage() */ /* swabbed by mdc_readpage() */ LASSERT_REPSWABBED(request, REPLY_REC_OFF); st->st_size = body->size; } else { CERROR("read_dir_page(%ld) error %d\n", page->index, rc); } ptlrpc_req_finished(request); EXIT; ldlm_lock_decref(&lockh, LCK_CR); return rc; } static struct page *llu_dir_read_page(struct inode *ino, unsigned long 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; } enum { EXT2_FT_UNKNOWN, EXT2_FT_REG_FILE, EXT2_FT_DIR, EXT2_FT_CHRDEV, EXT2_FT_BLKDEV, EXT2_FT_FIFO, EXT2_FT_SOCK, EXT2_FT_SYMLINK, EXT2_FT_MAX }; static unsigned char ext2_filetype_table[EXT2_FT_MAX] = { [EXT2_FT_UNKNOWN] DT_UNKNOWN, [EXT2_FT_REG_FILE] DT_REG, [EXT2_FT_DIR] DT_DIR, [EXT2_FT_CHRDEV] DT_CHR, [EXT2_FT_BLKDEV] DT_BLK, [EXT2_FT_FIFO] DT_FIFO, [EXT2_FT_SOCK] DT_SOCK, [EXT2_FT_SYMLINK] DT_LNK, }; #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; #ifndef _AIX dirent->d_type = (unsigned short) d_type; #endif memcpy(dirent->d_name, name, namelen); dirent->d_name[namelen] = 0; *filled += reclen; return 0; } ssize_t llu_iop_filldirentries(struct inode *ino, _SYSIO_OFF_T *basep, char *buf, size_t nbytes) { struct llu_inode_info *lli = llu_i2info(ino); struct intnl_stat *st = llu_i2stat(ino); loff_t pos = *basep, offset; int filled = 0; unsigned long pgidx, maxpages; ENTRY; liblustre_wait_event(0); if (st->st_size == 0) { CWARN("dir size is 0?\n"); RETURN(0); } if (pos == -1) pos = lli->lli_dir_pos; maxpages = (st->st_size + CFS_PAGE_SIZE - 1) >> CFS_PAGE_SHIFT; pgidx = pos >> CFS_PAGE_SHIFT; offset = pos & ~CFS_PAGE_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 = (st->st_size + CFS_PAGE_SIZE - 1) >> CFS_PAGE_SHIFT; /* fill in buffer */ addr = page->addr; limit = addr + CFS_PAGE_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 = DT_UNKNOWN; if (de->file_type < EXT2_FT_MAX) d_type = ext2_filetype_table[de->file_type]; offset = (char*) de - addr; over = filldir(buf, nbytes, de->name, de->name_len, (((__u64)pgidx << CFS_PAGE_SHIFT) | offset) + le16_to_cpu(de->rec_len), le32_to_cpu(de->inode), d_type, &filled); if (over) { free_page(page); GOTO(done, 0); } } } free_page(page); } done: lli->lli_dir_pos = (__u64)pgidx << CFS_PAGE_SHIFT | offset; *basep = lli->lli_dir_pos; liblustre_wait_event(0); RETURN(filled); }