1 /* 2 * ifile.c - NILFS inode file 3 * 4 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 19 * 20 * Written by Amagai Yoshiji <amagai@osrg.net>. 21 * Revised by Ryusuke Konishi <ryusuke@osrg.net>. 22 * 23 */ 24 25 #include <linux/types.h> 26 #include <linux/buffer_head.h> 27 #include "nilfs.h" 28 #include "mdt.h" 29 #include "alloc.h" 30 #include "ifile.h" 31 32 /** 33 * nilfs_ifile_create_inode - create a new disk inode 34 * @ifile: ifile inode 35 * @out_ino: pointer to a variable to store inode number 36 * @out_bh: buffer_head contains newly allocated disk inode 37 * 38 * Return Value: On success, 0 is returned and the newly allocated inode 39 * number is stored in the place pointed by @ino, and buffer_head pointer 40 * that contains newly allocated disk inode structure is stored in the 41 * place pointed by @out_bh 42 * On error, one of the following negative error codes is returned. 43 * 44 * %-EIO - I/O error. 45 * 46 * %-ENOMEM - Insufficient amount of memory available. 47 * 48 * %-ENOSPC - No inode left. 49 */ 50 int nilfs_ifile_create_inode(struct inode *ifile, ino_t *out_ino, 51 struct buffer_head **out_bh) 52 { 53 struct nilfs_palloc_req req; 54 int ret; 55 56 req.pr_entry_nr = 0; /* 0 says find free inode from beginning of 57 a group. dull code!! */ 58 req.pr_entry_bh = NULL; 59 60 ret = nilfs_palloc_prepare_alloc_entry(ifile, &req); 61 if (!ret) { 62 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 1, 63 &req.pr_entry_bh); 64 if (ret < 0) 65 nilfs_palloc_abort_alloc_entry(ifile, &req); 66 } 67 if (ret < 0) { 68 brelse(req.pr_entry_bh); 69 return ret; 70 } 71 nilfs_palloc_commit_alloc_entry(ifile, &req); 72 nilfs_mdt_mark_buffer_dirty(req.pr_entry_bh); 73 nilfs_mdt_mark_dirty(ifile); 74 *out_ino = (ino_t)req.pr_entry_nr; 75 *out_bh = req.pr_entry_bh; 76 return 0; 77 } 78 79 /** 80 * nilfs_ifile_delete_inode - delete a disk inode 81 * @ifile: ifile inode 82 * @ino: inode number 83 * 84 * Return Value: On success, 0 is returned. On error, one of the following 85 * negative error codes is returned. 86 * 87 * %-EIO - I/O error. 88 * 89 * %-ENOMEM - Insufficient amount of memory available. 90 * 91 * %-ENOENT - The inode number @ino have not been allocated. 92 */ 93 int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino) 94 { 95 struct nilfs_palloc_req req = { 96 .pr_entry_nr = ino, .pr_entry_bh = NULL 97 }; 98 struct nilfs_inode *raw_inode; 99 void *kaddr; 100 int ret; 101 102 ret = nilfs_palloc_prepare_free_entry(ifile, &req); 103 if (!ret) { 104 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 0, 105 &req.pr_entry_bh); 106 if (ret < 0) 107 nilfs_palloc_abort_free_entry(ifile, &req); 108 } 109 if (ret < 0) { 110 brelse(req.pr_entry_bh); 111 return ret; 112 } 113 114 kaddr = kmap_atomic(req.pr_entry_bh->b_page, KM_USER0); 115 raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr, 116 req.pr_entry_bh, kaddr); 117 raw_inode->i_flags = 0; 118 kunmap_atomic(kaddr, KM_USER0); 119 120 nilfs_mdt_mark_buffer_dirty(req.pr_entry_bh); 121 brelse(req.pr_entry_bh); 122 123 nilfs_palloc_commit_free_entry(ifile, &req); 124 125 return 0; 126 } 127 128 int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino, 129 struct buffer_head **out_bh) 130 { 131 struct super_block *sb = ifile->i_sb; 132 int err; 133 134 if (unlikely(!NILFS_VALID_INODE(sb, ino))) { 135 nilfs_error(sb, __func__, "bad inode number: %lu", 136 (unsigned long) ino); 137 return -EINVAL; 138 } 139 140 err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh); 141 if (unlikely(err)) { 142 if (err == -EINVAL) 143 nilfs_error(sb, __func__, "ifile is broken"); 144 else 145 nilfs_warning(sb, __func__, 146 "unable to read inode: %lu", 147 (unsigned long) ino); 148 } 149 return err; 150 } 151