324 lines
7.3 KiB
C
324 lines
7.3 KiB
C
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/*
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* Copyright (C) 2005, 2006
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* Avishay Traeger (avishay@gmail.com)
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* Copyright (C) 2008, 2009
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* Boaz Harrosh <ooo@electrozaur.com>
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*
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* Copyrights for code taken from ext2:
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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* from
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* linux/fs/minix/inode.c
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* This file is part of exofs.
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*
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* exofs is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation. Since it is based on ext2, and the only
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* valid version of GPL for the Linux kernel is version 2, the only valid
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* version of GPL for exofs is version 2.
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*
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* exofs is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with exofs; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "exofs.h"
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static inline int exofs_add_nondir(struct dentry *dentry, struct inode *inode)
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{
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int err = exofs_add_link(dentry, inode);
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if (!err) {
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d_instantiate(dentry, inode);
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return 0;
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}
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inode_dec_link_count(inode);
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iput(inode);
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return err;
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}
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static struct dentry *exofs_lookup(struct inode *dir, struct dentry *dentry,
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unsigned int flags)
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{
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struct inode *inode;
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ino_t ino;
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if (dentry->d_name.len > EXOFS_NAME_LEN)
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return ERR_PTR(-ENAMETOOLONG);
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ino = exofs_inode_by_name(dir, dentry);
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inode = ino ? exofs_iget(dir->i_sb, ino) : NULL;
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return d_splice_alias(inode, dentry);
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}
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static int exofs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
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bool excl)
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{
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struct inode *inode = exofs_new_inode(dir, mode);
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int err = PTR_ERR(inode);
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if (!IS_ERR(inode)) {
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inode->i_op = &exofs_file_inode_operations;
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inode->i_fop = &exofs_file_operations;
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inode->i_mapping->a_ops = &exofs_aops;
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mark_inode_dirty(inode);
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err = exofs_add_nondir(dentry, inode);
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}
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return err;
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}
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static int exofs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
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dev_t rdev)
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{
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struct inode *inode;
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int err;
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inode = exofs_new_inode(dir, mode);
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err = PTR_ERR(inode);
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if (!IS_ERR(inode)) {
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init_special_inode(inode, inode->i_mode, rdev);
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mark_inode_dirty(inode);
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err = exofs_add_nondir(dentry, inode);
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}
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return err;
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}
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static int exofs_symlink(struct inode *dir, struct dentry *dentry,
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const char *symname)
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{
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struct super_block *sb = dir->i_sb;
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int err = -ENAMETOOLONG;
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unsigned l = strlen(symname)+1;
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struct inode *inode;
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struct exofs_i_info *oi;
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if (l > sb->s_blocksize)
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goto out;
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inode = exofs_new_inode(dir, S_IFLNK | S_IRWXUGO);
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err = PTR_ERR(inode);
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if (IS_ERR(inode))
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goto out;
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oi = exofs_i(inode);
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if (l > sizeof(oi->i_data)) {
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/* slow symlink */
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inode->i_op = &page_symlink_inode_operations;
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inode_nohighmem(inode);
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inode->i_mapping->a_ops = &exofs_aops;
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memset(oi->i_data, 0, sizeof(oi->i_data));
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err = page_symlink(inode, symname, l);
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if (err)
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goto out_fail;
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} else {
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/* fast symlink */
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inode->i_op = &simple_symlink_inode_operations;
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inode->i_link = (char *)oi->i_data;
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memcpy(oi->i_data, symname, l);
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inode->i_size = l-1;
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}
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mark_inode_dirty(inode);
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err = exofs_add_nondir(dentry, inode);
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out:
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return err;
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out_fail:
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inode_dec_link_count(inode);
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iput(inode);
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goto out;
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}
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static int exofs_link(struct dentry *old_dentry, struct inode *dir,
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struct dentry *dentry)
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{
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struct inode *inode = d_inode(old_dentry);
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inode->i_ctime = current_time(inode);
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inode_inc_link_count(inode);
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ihold(inode);
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return exofs_add_nondir(dentry, inode);
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}
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static int exofs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
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{
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struct inode *inode;
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int err;
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inode_inc_link_count(dir);
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inode = exofs_new_inode(dir, S_IFDIR | mode);
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err = PTR_ERR(inode);
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if (IS_ERR(inode))
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goto out_dir;
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inode->i_op = &exofs_dir_inode_operations;
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inode->i_fop = &exofs_dir_operations;
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inode->i_mapping->a_ops = &exofs_aops;
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inode_inc_link_count(inode);
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err = exofs_make_empty(inode, dir);
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if (err)
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goto out_fail;
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err = exofs_add_link(dentry, inode);
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if (err)
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goto out_fail;
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d_instantiate(dentry, inode);
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out:
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return err;
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out_fail:
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inode_dec_link_count(inode);
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inode_dec_link_count(inode);
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iput(inode);
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out_dir:
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inode_dec_link_count(dir);
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goto out;
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}
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static int exofs_unlink(struct inode *dir, struct dentry *dentry)
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{
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struct inode *inode = d_inode(dentry);
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struct exofs_dir_entry *de;
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struct page *page;
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int err = -ENOENT;
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de = exofs_find_entry(dir, dentry, &page);
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if (!de)
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goto out;
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err = exofs_delete_entry(de, page);
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if (err)
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goto out;
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inode->i_ctime = dir->i_ctime;
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inode_dec_link_count(inode);
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err = 0;
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out:
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return err;
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}
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static int exofs_rmdir(struct inode *dir, struct dentry *dentry)
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{
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struct inode *inode = d_inode(dentry);
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int err = -ENOTEMPTY;
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if (exofs_empty_dir(inode)) {
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err = exofs_unlink(dir, dentry);
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if (!err) {
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inode->i_size = 0;
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inode_dec_link_count(inode);
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inode_dec_link_count(dir);
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}
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}
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return err;
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}
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static int exofs_rename(struct inode *old_dir, struct dentry *old_dentry,
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struct inode *new_dir, struct dentry *new_dentry,
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unsigned int flags)
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{
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struct inode *old_inode = d_inode(old_dentry);
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struct inode *new_inode = d_inode(new_dentry);
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struct page *dir_page = NULL;
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struct exofs_dir_entry *dir_de = NULL;
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struct page *old_page;
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struct exofs_dir_entry *old_de;
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int err = -ENOENT;
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if (flags & ~RENAME_NOREPLACE)
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return -EINVAL;
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old_de = exofs_find_entry(old_dir, old_dentry, &old_page);
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if (!old_de)
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goto out;
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if (S_ISDIR(old_inode->i_mode)) {
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err = -EIO;
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dir_de = exofs_dotdot(old_inode, &dir_page);
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if (!dir_de)
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goto out_old;
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}
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if (new_inode) {
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struct page *new_page;
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struct exofs_dir_entry *new_de;
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err = -ENOTEMPTY;
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if (dir_de && !exofs_empty_dir(new_inode))
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goto out_dir;
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err = -ENOENT;
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new_de = exofs_find_entry(new_dir, new_dentry, &new_page);
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if (!new_de)
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goto out_dir;
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err = exofs_set_link(new_dir, new_de, new_page, old_inode);
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new_inode->i_ctime = current_time(new_inode);
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if (dir_de)
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drop_nlink(new_inode);
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inode_dec_link_count(new_inode);
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if (err)
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goto out_dir;
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} else {
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err = exofs_add_link(new_dentry, old_inode);
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if (err)
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goto out_dir;
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if (dir_de)
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inode_inc_link_count(new_dir);
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}
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old_inode->i_ctime = current_time(old_inode);
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exofs_delete_entry(old_de, old_page);
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mark_inode_dirty(old_inode);
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if (dir_de) {
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err = exofs_set_link(old_inode, dir_de, dir_page, new_dir);
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inode_dec_link_count(old_dir);
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if (err)
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goto out_dir;
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}
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return 0;
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out_dir:
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if (dir_de) {
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kunmap(dir_page);
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put_page(dir_page);
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}
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out_old:
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kunmap(old_page);
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put_page(old_page);
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out:
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return err;
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}
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const struct inode_operations exofs_dir_inode_operations = {
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.create = exofs_create,
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.lookup = exofs_lookup,
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.link = exofs_link,
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.unlink = exofs_unlink,
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.symlink = exofs_symlink,
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.mkdir = exofs_mkdir,
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.rmdir = exofs_rmdir,
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.mknod = exofs_mknod,
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.rename = exofs_rename,
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.setattr = exofs_setattr,
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};
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const struct inode_operations exofs_special_inode_operations = {
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.setattr = exofs_setattr,
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};
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