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| -rw-r--r-- | fs/nilfs2/ifile.c | 150 | ||||
| -rw-r--r-- | fs/nilfs2/ifile.h | 53 |
2 files changed, 203 insertions, 0 deletions
diff --git a/fs/nilfs2/ifile.c b/fs/nilfs2/ifile.c new file mode 100644 index 00000000000..de86401f209 --- /dev/null +++ b/fs/nilfs2/ifile.c @@ -0,0 +1,150 @@ +/* + * 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; +} diff --git a/fs/nilfs2/ifile.h b/fs/nilfs2/ifile.h new file mode 100644 index 00000000000..5d30a35679b --- /dev/null +++ b/fs/nilfs2/ifile.h @@ -0,0 +1,53 @@ +/* + * ifile.h - 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> + * + */ + +#ifndef _NILFS_IFILE_H +#define _NILFS_IFILE_H + +#include <linux/fs.h> +#include <linux/buffer_head.h> +#include <linux/nilfs2_fs.h> +#include "mdt.h" +#include "alloc.h" + +#define NILFS_IFILE_GFP NILFS_MDT_GFP + +static inline struct nilfs_inode * +nilfs_ifile_map_inode(struct inode *ifile, ino_t ino, struct buffer_head *ibh) +{ + void *kaddr = kmap(ibh->b_page); + return nilfs_palloc_block_get_entry(ifile, ino, ibh, kaddr); +} + +static inline void nilfs_ifile_unmap_inode(struct inode *ifile, ino_t ino, + struct buffer_head *ibh) +{ + kunmap(ibh->b_page); +} + +int nilfs_ifile_create_inode(struct inode *, ino_t *, struct buffer_head **); +int nilfs_ifile_delete_inode(struct inode *, ino_t); +int nilfs_ifile_get_inode_block(struct inode *, ino_t, struct buffer_head **); + +#endif /* _NILFS_IFILE_H */ |