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 struct nilfs_ifile_info { 34 struct nilfs_mdt_info mi; 35 struct nilfs_palloc_cache palloc_cache; 36 }; 37 38 static inline struct nilfs_ifile_info *NILFS_IFILE_I(struct inode *ifile) 39 { 40 return (struct nilfs_ifile_info *)NILFS_MDT(ifile); 41 } 42 43 /** 44 * nilfs_ifile_create_inode - create a new disk inode 45 * @ifile: ifile inode 46 * @out_ino: pointer to a variable to store inode number 47 * @out_bh: buffer_head contains newly allocated disk inode 48 * 49 * Return Value: On success, 0 is returned and the newly allocated inode 50 * number is stored in the place pointed by @ino, and buffer_head pointer 51 * that contains newly allocated disk inode structure is stored in the 52 * place pointed by @out_bh 53 * On error, one of the following negative error codes is returned. 54 * 55 * %-EIO - I/O error. 56 * 57 * %-ENOMEM - Insufficient amount of memory available. 58 * 59 * %-ENOSPC - No inode left. 60 */ 61 int nilfs_ifile_create_inode(struct inode *ifile, ino_t *out_ino, 62 struct buffer_head **out_bh) 63 { 64 struct nilfs_palloc_req req; 65 int ret; 66 67 req.pr_entry_nr = 0; /* 0 says find free inode from beginning of 68 a group. dull code!! */ 69 req.pr_entry_bh = NULL; 70 71 ret = nilfs_palloc_prepare_alloc_entry(ifile, &req); 72 if (!ret) { 73 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 1, 74 &req.pr_entry_bh); 75 if (ret < 0) 76 nilfs_palloc_abort_alloc_entry(ifile, &req); 77 } 78 if (ret < 0) { 79 brelse(req.pr_entry_bh); 80 return ret; 81 } 82 nilfs_palloc_commit_alloc_entry(ifile, &req); 83 mark_buffer_dirty(req.pr_entry_bh); 84 nilfs_mdt_mark_dirty(ifile); 85 *out_ino = (ino_t)req.pr_entry_nr; 86 *out_bh = req.pr_entry_bh; 87 return 0; 88 } 89 90 /** 91 * nilfs_ifile_delete_inode - delete a disk inode 92 * @ifile: ifile inode 93 * @ino: inode number 94 * 95 * Return Value: On success, 0 is returned. On error, one of the following 96 * negative error codes is returned. 97 * 98 * %-EIO - I/O error. 99 * 100 * %-ENOMEM - Insufficient amount of memory available. 101 * 102 * %-ENOENT - The inode number @ino have not been allocated. 103 */ 104 int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino) 105 { 106 struct nilfs_palloc_req req = { 107 .pr_entry_nr = ino, .pr_entry_bh = NULL 108 }; 109 struct nilfs_inode *raw_inode; 110 void *kaddr; 111 int ret; 112 113 ret = nilfs_palloc_prepare_free_entry(ifile, &req); 114 if (!ret) { 115 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 0, 116 &req.pr_entry_bh); 117 if (ret < 0) 118 nilfs_palloc_abort_free_entry(ifile, &req); 119 } 120 if (ret < 0) { 121 brelse(req.pr_entry_bh); 122 return ret; 123 } 124 125 kaddr = kmap_atomic(req.pr_entry_bh->b_page, KM_USER0); 126 raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr, 127 req.pr_entry_bh, kaddr); 128 raw_inode->i_flags = 0; 129 kunmap_atomic(kaddr, KM_USER0); 130 131 mark_buffer_dirty(req.pr_entry_bh); 132 brelse(req.pr_entry_bh); 133 134 nilfs_palloc_commit_free_entry(ifile, &req); 135 136 return 0; 137 } 138 139 int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino, 140 struct buffer_head **out_bh) 141 { 142 struct super_block *sb = ifile->i_sb; 143 int err; 144 145 if (unlikely(!NILFS_VALID_INODE(sb, ino))) { 146 nilfs_error(sb, __func__, "bad inode number: %lu", 147 (unsigned long) ino); 148 return -EINVAL; 149 } 150 151 err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh); 152 if (unlikely(err)) 153 nilfs_warning(sb, __func__, "unable to read inode: %lu", 154 (unsigned long) ino); 155 return err; 156 } 157 158 /** 159 * nilfs_ifile_read - read or get ifile inode 160 * @sb: super block instance 161 * @root: root object 162 * @inode_size: size of an inode 163 * @raw_inode: on-disk ifile inode 164 * @inodep: buffer to store the inode 165 */ 166 int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root, 167 size_t inode_size, struct nilfs_inode *raw_inode, 168 struct inode **inodep) 169 { 170 struct inode *ifile; 171 int err; 172 173 ifile = nilfs_iget_locked(sb, root, NILFS_IFILE_INO); 174 if (unlikely(!ifile)) 175 return -ENOMEM; 176 if (!(ifile->i_state & I_NEW)) 177 goto out; 178 179 err = nilfs_mdt_init(ifile, NILFS_MDT_GFP, 180 sizeof(struct nilfs_ifile_info)); 181 if (err) 182 goto failed; 183 184 err = nilfs_palloc_init_blockgroup(ifile, inode_size); 185 if (err) 186 goto failed; 187 188 nilfs_palloc_setup_cache(ifile, &NILFS_IFILE_I(ifile)->palloc_cache); 189 190 err = nilfs_read_inode_common(ifile, raw_inode); 191 if (err) 192 goto failed; 193 194 unlock_new_inode(ifile); 195 out: 196 *inodep = ifile; 197 return 0; 198 failed: 199 iget_failed(ifile); 200 return err; 201 } 202