/* * ifile.c - NILFS inode file * * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program 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 this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * * Written by Amagai Yoshiji <amagai@osrg.net>. * Revised by Ryusuke Konishi <ryusuke@osrg.net>. * */ #include <linux/types.h> #include <linux/buffer_head.h> #include "nilfs.h" #include "mdt.h" #include "alloc.h" #include "ifile.h" /** * nilfs_ifile_create_inode - create a new disk inode * @ifile: ifile inode * @out_ino: pointer to a variable to store inode number * @out_bh: buffer_head contains newly allocated disk inode * * Return Value: On success, 0 is returned and the newly allocated inode * number is stored in the place pointed by @ino, and buffer_head pointer * that contains newly allocated disk inode structure is stored in the * place pointed by @out_bh * On error, one of the following negative error codes is returned. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. * * %-ENOSPC - No inode left. */ int nilfs_ifile_create_inode(struct inode *ifile, ino_t *out_ino, struct buffer_head **out_bh) { struct nilfs_palloc_req req; int ret; req.pr_entry_nr = 0; /* 0 says find free inode from beginning of a group. dull code!! */ req.pr_entry_bh = NULL; ret = nilfs_palloc_prepare_alloc_entry(ifile, &req); if (!ret) { ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 1, &req.pr_entry_bh); if (ret < 0) nilfs_palloc_abort_alloc_entry(ifile, &req); } if (ret < 0) { brelse(req.pr_entry_bh); return ret; } nilfs_palloc_commit_alloc_entry(ifile, &req); nilfs_mdt_mark_buffer_dirty(req.pr_entry_bh); nilfs_mdt_mark_dirty(ifile); *out_ino = (ino_t)req.pr_entry_nr; *out_bh = req.pr_entry_bh; return 0; } /** * nilfs_ifile_delete_inode - delete a disk inode * @ifile: ifile inode * @ino: inode number * * Return Value: On success, 0 is returned. On error, one of the following * negative error codes is returned. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. * * %-ENOENT - The inode number @ino have not been allocated. */ int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino) { struct nilfs_palloc_req req = { .pr_entry_nr = ino, .pr_entry_bh = NULL }; struct nilfs_inode *raw_inode; void *kaddr; int ret; ret = nilfs_palloc_prepare_free_entry(ifile, &req); if (!ret) { ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 0, &req.pr_entry_bh); if (ret < 0) nilfs_palloc_abort_free_entry(ifile, &req); } if (ret < 0) { brelse(req.pr_entry_bh); return ret; } kaddr = kmap_atomic(req.pr_entry_bh->b_page, KM_USER0); raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr, req.pr_entry_bh, kaddr); raw_inode->i_flags = 0; kunmap_atomic(kaddr, KM_USER0); nilfs_mdt_mark_buffer_dirty(req.pr_entry_bh); brelse(req.pr_entry_bh); nilfs_palloc_commit_free_entry(ifile, &req); return 0; } int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino, struct buffer_head **out_bh) { struct super_block *sb = ifile->i_sb; int err; if (unlikely(!NILFS_VALID_INODE(sb, ino))) { nilfs_error(sb, __func__, "bad inode number: %lu", (unsigned long) ino); return -EINVAL; } err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh); if (unlikely(err)) { if (err == -EINVAL) nilfs_error(sb, __func__, "ifile is broken"); else nilfs_warning(sb, __func__, "unable to read inode: %lu", (unsigned long) ino); } return err; }