1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * ifile.c - NILFS inode file 4 * 5 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. 6 * 7 * Written by Amagai Yoshiji. 8 * Revised by Ryusuke Konishi. 9 * 10 */ 11 12 #include <linux/types.h> 13 #include <linux/buffer_head.h> 14 #include "nilfs.h" 15 #include "mdt.h" 16 #include "alloc.h" 17 #include "ifile.h" 18 19 /** 20 * struct nilfs_ifile_info - on-memory private data of ifile 21 * @mi: on-memory private data of metadata file 22 * @palloc_cache: persistent object allocator cache of ifile 23 */ 24 struct nilfs_ifile_info { 25 struct nilfs_mdt_info mi; 26 struct nilfs_palloc_cache palloc_cache; 27 }; 28 29 static inline struct nilfs_ifile_info *NILFS_IFILE_I(struct inode *ifile) 30 { 31 return (struct nilfs_ifile_info *)NILFS_MDT(ifile); 32 } 33 34 /** 35 * nilfs_ifile_create_inode - create a new disk inode 36 * @ifile: ifile inode 37 * @out_ino: pointer to a variable to store inode number 38 * @out_bh: buffer_head contains newly allocated disk inode 39 * 40 * Return Value: On success, 0 is returned and the newly allocated inode 41 * number is stored in the place pointed by @ino, and buffer_head pointer 42 * that contains newly allocated disk inode structure is stored in the 43 * place pointed by @out_bh 44 * On error, one of the following negative error codes is returned. 45 * 46 * %-EIO - I/O error. 47 * 48 * %-ENOMEM - Insufficient amount of memory available. 49 * 50 * %-ENOSPC - No inode left. 51 */ 52 int nilfs_ifile_create_inode(struct inode *ifile, ino_t *out_ino, 53 struct buffer_head **out_bh) 54 { 55 struct nilfs_palloc_req req; 56 int ret; 57 58 req.pr_entry_nr = 0; /* 59 * 0 says find free inode from beginning 60 * of a group. dull code!! 61 */ 62 req.pr_entry_bh = NULL; 63 64 ret = nilfs_palloc_prepare_alloc_entry(ifile, &req); 65 if (!ret) { 66 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 1, 67 &req.pr_entry_bh); 68 if (ret < 0) 69 nilfs_palloc_abort_alloc_entry(ifile, &req); 70 } 71 if (ret < 0) { 72 brelse(req.pr_entry_bh); 73 return ret; 74 } 75 nilfs_palloc_commit_alloc_entry(ifile, &req); 76 mark_buffer_dirty(req.pr_entry_bh); 77 nilfs_mdt_mark_dirty(ifile); 78 *out_ino = (ino_t)req.pr_entry_nr; 79 *out_bh = req.pr_entry_bh; 80 return 0; 81 } 82 83 /** 84 * nilfs_ifile_delete_inode - delete a disk inode 85 * @ifile: ifile inode 86 * @ino: inode number 87 * 88 * Return Value: On success, 0 is returned. On error, one of the following 89 * negative error codes is returned. 90 * 91 * %-EIO - I/O error. 92 * 93 * %-ENOMEM - Insufficient amount of memory available. 94 * 95 * %-ENOENT - The inode number @ino have not been allocated. 96 */ 97 int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino) 98 { 99 struct nilfs_palloc_req req = { 100 .pr_entry_nr = ino, .pr_entry_bh = NULL 101 }; 102 struct nilfs_inode *raw_inode; 103 void *kaddr; 104 int ret; 105 106 ret = nilfs_palloc_prepare_free_entry(ifile, &req); 107 if (!ret) { 108 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 0, 109 &req.pr_entry_bh); 110 if (ret < 0) 111 nilfs_palloc_abort_free_entry(ifile, &req); 112 } 113 if (ret < 0) { 114 brelse(req.pr_entry_bh); 115 return ret; 116 } 117 118 kaddr = kmap_atomic(req.pr_entry_bh->b_page); 119 raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr, 120 req.pr_entry_bh, kaddr); 121 raw_inode->i_flags = 0; 122 kunmap_atomic(kaddr); 123 124 mark_buffer_dirty(req.pr_entry_bh); 125 brelse(req.pr_entry_bh); 126 127 nilfs_palloc_commit_free_entry(ifile, &req); 128 129 return 0; 130 } 131 132 int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino, 133 struct buffer_head **out_bh) 134 { 135 struct super_block *sb = ifile->i_sb; 136 int err; 137 138 if (unlikely(!NILFS_VALID_INODE(sb, ino))) { 139 nilfs_error(sb, "bad inode number: %lu", (unsigned long)ino); 140 return -EINVAL; 141 } 142 143 err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh); 144 if (unlikely(err)) 145 nilfs_warn(sb, "error %d reading inode: ino=%lu", 146 err, (unsigned long)ino); 147 return err; 148 } 149 150 /** 151 * nilfs_ifile_count_free_inodes - calculate free inodes count 152 * @ifile: ifile inode 153 * @nmaxinodes: current maximum of available inodes count [out] 154 * @nfreeinodes: free inodes count [out] 155 */ 156 int nilfs_ifile_count_free_inodes(struct inode *ifile, 157 u64 *nmaxinodes, u64 *nfreeinodes) 158 { 159 u64 nused; 160 int err; 161 162 *nmaxinodes = 0; 163 *nfreeinodes = 0; 164 165 nused = atomic64_read(&NILFS_I(ifile)->i_root->inodes_count); 166 err = nilfs_palloc_count_max_entries(ifile, nused, nmaxinodes); 167 if (likely(!err)) 168 *nfreeinodes = *nmaxinodes - nused; 169 return err; 170 } 171 172 /** 173 * nilfs_ifile_read - read or get ifile inode 174 * @sb: super block instance 175 * @root: root object 176 * @inode_size: size of an inode 177 * @raw_inode: on-disk ifile inode 178 * @inodep: buffer to store the inode 179 */ 180 int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root, 181 size_t inode_size, struct nilfs_inode *raw_inode, 182 struct inode **inodep) 183 { 184 struct inode *ifile; 185 int err; 186 187 ifile = nilfs_iget_locked(sb, root, NILFS_IFILE_INO); 188 if (unlikely(!ifile)) 189 return -ENOMEM; 190 if (!(ifile->i_state & I_NEW)) 191 goto out; 192 193 err = nilfs_mdt_init(ifile, NILFS_MDT_GFP, 194 sizeof(struct nilfs_ifile_info)); 195 if (err) 196 goto failed; 197 198 err = nilfs_palloc_init_blockgroup(ifile, inode_size); 199 if (err) 200 goto failed; 201 202 nilfs_palloc_setup_cache(ifile, &NILFS_IFILE_I(ifile)->palloc_cache); 203 204 err = nilfs_read_inode_common(ifile, raw_inode); 205 if (err) 206 goto failed; 207 208 unlock_new_inode(ifile); 209 out: 210 *inodep = ifile; 211 return 0; 212 failed: 213 iget_failed(ifile); 214 return err; 215 } 216