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1// SPDX-License-Identifier: GPL-2.0+2/*3 * NILFS inode file4 *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#include "cpfile.h"19 20/**21 * struct nilfs_ifile_info - on-memory private data of ifile22 * @mi: on-memory private data of metadata file23 * @palloc_cache: persistent object allocator cache of ifile24 */25struct nilfs_ifile_info {26 struct nilfs_mdt_info mi;27 struct nilfs_palloc_cache palloc_cache;28};29 30static inline struct nilfs_ifile_info *NILFS_IFILE_I(struct inode *ifile)31{32 return (struct nilfs_ifile_info *)NILFS_MDT(ifile);33}34 35/**36 * nilfs_ifile_create_inode - create a new disk inode37 * @ifile: ifile inode38 * @out_ino: pointer to a variable to store inode number39 * @out_bh: buffer_head contains newly allocated disk inode40 *41 * Return Value: On success, 0 is returned and the newly allocated inode42 * number is stored in the place pointed by @ino, and buffer_head pointer43 * that contains newly allocated disk inode structure is stored in the44 * place pointed by @out_bh45 * On error, one of the following negative error codes is returned.46 *47 * %-EIO - I/O error.48 *49 * %-ENOMEM - Insufficient amount of memory available.50 *51 * %-ENOSPC - No inode left.52 */53int nilfs_ifile_create_inode(struct inode *ifile, ino_t *out_ino,54 struct buffer_head **out_bh)55{56 struct nilfs_palloc_req req;57 int ret;58 59 req.pr_entry_nr = NILFS_FIRST_INO(ifile->i_sb);60 req.pr_entry_bh = NULL;61 62 ret = nilfs_palloc_prepare_alloc_entry(ifile, &req, false);63 if (!ret) {64 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 1,65 &req.pr_entry_bh);66 if (ret < 0)67 nilfs_palloc_abort_alloc_entry(ifile, &req);68 }69 if (ret < 0) {70 brelse(req.pr_entry_bh);71 return ret;72 }73 nilfs_palloc_commit_alloc_entry(ifile, &req);74 mark_buffer_dirty(req.pr_entry_bh);75 nilfs_mdt_mark_dirty(ifile);76 *out_ino = (ino_t)req.pr_entry_nr;77 *out_bh = req.pr_entry_bh;78 return 0;79}80 81/**82 * nilfs_ifile_delete_inode - delete a disk inode83 * @ifile: ifile inode84 * @ino: inode number85 *86 * Return Value: On success, 0 is returned. On error, one of the following87 * negative error codes is returned.88 *89 * %-EIO - I/O error.90 *91 * %-ENOMEM - Insufficient amount of memory available.92 *93 * %-ENOENT - The inode number @ino have not been allocated.94 */95int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino)96{97 struct nilfs_palloc_req req = {98 .pr_entry_nr = ino, .pr_entry_bh = NULL99 };100 struct nilfs_inode *raw_inode;101 void *kaddr;102 int ret;103 104 ret = nilfs_palloc_prepare_free_entry(ifile, &req);105 if (!ret) {106 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 0,107 &req.pr_entry_bh);108 if (ret < 0)109 nilfs_palloc_abort_free_entry(ifile, &req);110 }111 if (ret < 0) {112 brelse(req.pr_entry_bh);113 return ret;114 }115 116 kaddr = kmap_local_page(req.pr_entry_bh->b_page);117 raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr,118 req.pr_entry_bh, kaddr);119 raw_inode->i_flags = 0;120 kunmap_local(kaddr);121 122 mark_buffer_dirty(req.pr_entry_bh);123 brelse(req.pr_entry_bh);124 125 nilfs_palloc_commit_free_entry(ifile, &req);126 127 return 0;128}129 130int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,131 struct buffer_head **out_bh)132{133 struct super_block *sb = ifile->i_sb;134 int err;135 136 if (unlikely(!NILFS_VALID_INODE(sb, ino))) {137 nilfs_error(sb, "bad inode number: %lu", (unsigned long)ino);138 return -EINVAL;139 }140 141 err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh);142 if (unlikely(err))143 nilfs_warn(sb, "error %d reading inode: ino=%lu",144 err, (unsigned long)ino);145 return err;146}147 148/**149 * nilfs_ifile_count_free_inodes - calculate free inodes count150 * @ifile: ifile inode151 * @nmaxinodes: current maximum of available inodes count [out]152 * @nfreeinodes: free inodes count [out]153 */154int nilfs_ifile_count_free_inodes(struct inode *ifile,155 u64 *nmaxinodes, u64 *nfreeinodes)156{157 u64 nused;158 int err;159 160 *nmaxinodes = 0;161 *nfreeinodes = 0;162 163 nused = atomic64_read(&NILFS_I(ifile)->i_root->inodes_count);164 err = nilfs_palloc_count_max_entries(ifile, nused, nmaxinodes);165 if (likely(!err))166 *nfreeinodes = *nmaxinodes - nused;167 return err;168}169 170/**171 * nilfs_ifile_read - read or get ifile inode172 * @sb: super block instance173 * @root: root object174 * @cno: number of checkpoint entry to read175 * @inode_size: size of an inode176 *177 * Return: 0 on success, or the following negative error code on failure.178 * * %-EINVAL - Invalid checkpoint.179 * * %-ENOMEM - Insufficient memory available.180 * * %-EIO - I/O error (including metadata corruption).181 */182int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root,183 __u64 cno, size_t inode_size)184{185 struct the_nilfs *nilfs;186 struct inode *ifile;187 int err;188 189 ifile = nilfs_iget_locked(sb, root, NILFS_IFILE_INO);190 if (unlikely(!ifile))191 return -ENOMEM;192 if (!(ifile->i_state & I_NEW))193 goto out;194 195 err = nilfs_mdt_init(ifile, NILFS_MDT_GFP,196 sizeof(struct nilfs_ifile_info));197 if (err)198 goto failed;199 200 err = nilfs_palloc_init_blockgroup(ifile, inode_size);201 if (err)202 goto failed;203 204 nilfs_palloc_setup_cache(ifile, &NILFS_IFILE_I(ifile)->palloc_cache);205 206 nilfs = sb->s_fs_info;207 err = nilfs_cpfile_read_checkpoint(nilfs->ns_cpfile, cno, root, ifile);208 if (err)209 goto failed;210 211 unlock_new_inode(ifile);212 out:213 return 0;214 failed:215 iget_failed(ifile);216 return err;217}218