341 lines
7.6 KiB
C
341 lines
7.6 KiB
C
/*
|
|
* Copyright (C) 2005, 2006
|
|
* Avishay Traeger (avishay@gmail.com)
|
|
* Copyright (C) 2008, 2009
|
|
* Boaz Harrosh <bharrosh@panasas.com>
|
|
*
|
|
* Copyrights for code taken from ext2:
|
|
* Copyright (C) 1992, 1993, 1994, 1995
|
|
* Remy Card (card@masi.ibp.fr)
|
|
* Laboratoire MASI - Institut Blaise Pascal
|
|
* Universite Pierre et Marie Curie (Paris VI)
|
|
* from
|
|
* linux/fs/minix/inode.c
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*
|
|
* This file is part of exofs.
|
|
*
|
|
* exofs 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. Since it is based on ext2, and the only
|
|
* valid version of GPL for the Linux kernel is version 2, the only valid
|
|
* version of GPL for exofs is version 2.
|
|
*
|
|
* exofs 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 exofs; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "exofs.h"
|
|
|
|
static inline int exofs_add_nondir(struct dentry *dentry, struct inode *inode)
|
|
{
|
|
int err = exofs_add_link(dentry, inode);
|
|
if (!err) {
|
|
d_instantiate(dentry, inode);
|
|
return 0;
|
|
}
|
|
inode_dec_link_count(inode);
|
|
iput(inode);
|
|
return err;
|
|
}
|
|
|
|
static struct dentry *exofs_lookup(struct inode *dir, struct dentry *dentry,
|
|
struct nameidata *nd)
|
|
{
|
|
struct inode *inode;
|
|
ino_t ino;
|
|
|
|
if (dentry->d_name.len > EXOFS_NAME_LEN)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
ino = exofs_inode_by_name(dir, dentry);
|
|
inode = NULL;
|
|
if (ino) {
|
|
inode = exofs_iget(dir->i_sb, ino);
|
|
if (IS_ERR(inode))
|
|
return ERR_CAST(inode);
|
|
}
|
|
return d_splice_alias(inode, dentry);
|
|
}
|
|
|
|
static int exofs_create(struct inode *dir, struct dentry *dentry, int mode,
|
|
struct nameidata *nd)
|
|
{
|
|
struct inode *inode = exofs_new_inode(dir, mode);
|
|
int err = PTR_ERR(inode);
|
|
if (!IS_ERR(inode)) {
|
|
inode->i_op = &exofs_file_inode_operations;
|
|
inode->i_fop = &exofs_file_operations;
|
|
inode->i_mapping->a_ops = &exofs_aops;
|
|
mark_inode_dirty(inode);
|
|
err = exofs_add_nondir(dentry, inode);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int exofs_mknod(struct inode *dir, struct dentry *dentry, int mode,
|
|
dev_t rdev)
|
|
{
|
|
struct inode *inode;
|
|
int err;
|
|
|
|
if (!new_valid_dev(rdev))
|
|
return -EINVAL;
|
|
|
|
inode = exofs_new_inode(dir, mode);
|
|
err = PTR_ERR(inode);
|
|
if (!IS_ERR(inode)) {
|
|
init_special_inode(inode, inode->i_mode, rdev);
|
|
mark_inode_dirty(inode);
|
|
err = exofs_add_nondir(dentry, inode);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int exofs_symlink(struct inode *dir, struct dentry *dentry,
|
|
const char *symname)
|
|
{
|
|
struct super_block *sb = dir->i_sb;
|
|
int err = -ENAMETOOLONG;
|
|
unsigned l = strlen(symname)+1;
|
|
struct inode *inode;
|
|
struct exofs_i_info *oi;
|
|
|
|
if (l > sb->s_blocksize)
|
|
goto out;
|
|
|
|
inode = exofs_new_inode(dir, S_IFLNK | S_IRWXUGO);
|
|
err = PTR_ERR(inode);
|
|
if (IS_ERR(inode))
|
|
goto out;
|
|
|
|
oi = exofs_i(inode);
|
|
if (l > sizeof(oi->i_data)) {
|
|
/* slow symlink */
|
|
inode->i_op = &exofs_symlink_inode_operations;
|
|
inode->i_mapping->a_ops = &exofs_aops;
|
|
memset(oi->i_data, 0, sizeof(oi->i_data));
|
|
|
|
err = page_symlink(inode, symname, l);
|
|
if (err)
|
|
goto out_fail;
|
|
} else {
|
|
/* fast symlink */
|
|
inode->i_op = &exofs_fast_symlink_inode_operations;
|
|
memcpy(oi->i_data, symname, l);
|
|
inode->i_size = l-1;
|
|
}
|
|
mark_inode_dirty(inode);
|
|
|
|
err = exofs_add_nondir(dentry, inode);
|
|
out:
|
|
return err;
|
|
|
|
out_fail:
|
|
inode_dec_link_count(inode);
|
|
iput(inode);
|
|
goto out;
|
|
}
|
|
|
|
static int exofs_link(struct dentry *old_dentry, struct inode *dir,
|
|
struct dentry *dentry)
|
|
{
|
|
struct inode *inode = old_dentry->d_inode;
|
|
|
|
if (inode->i_nlink >= EXOFS_LINK_MAX)
|
|
return -EMLINK;
|
|
|
|
inode->i_ctime = CURRENT_TIME;
|
|
inode_inc_link_count(inode);
|
|
atomic_inc(&inode->i_count);
|
|
|
|
return exofs_add_nondir(dentry, inode);
|
|
}
|
|
|
|
static int exofs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
|
|
{
|
|
struct inode *inode;
|
|
int err = -EMLINK;
|
|
|
|
if (dir->i_nlink >= EXOFS_LINK_MAX)
|
|
goto out;
|
|
|
|
inode_inc_link_count(dir);
|
|
|
|
inode = exofs_new_inode(dir, S_IFDIR | mode);
|
|
err = PTR_ERR(inode);
|
|
if (IS_ERR(inode))
|
|
goto out_dir;
|
|
|
|
inode->i_op = &exofs_dir_inode_operations;
|
|
inode->i_fop = &exofs_dir_operations;
|
|
inode->i_mapping->a_ops = &exofs_aops;
|
|
|
|
inode_inc_link_count(inode);
|
|
|
|
err = exofs_make_empty(inode, dir);
|
|
if (err)
|
|
goto out_fail;
|
|
|
|
err = exofs_add_link(dentry, inode);
|
|
if (err)
|
|
goto out_fail;
|
|
|
|
d_instantiate(dentry, inode);
|
|
out:
|
|
return err;
|
|
|
|
out_fail:
|
|
inode_dec_link_count(inode);
|
|
inode_dec_link_count(inode);
|
|
iput(inode);
|
|
out_dir:
|
|
inode_dec_link_count(dir);
|
|
goto out;
|
|
}
|
|
|
|
static int exofs_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct exofs_dir_entry *de;
|
|
struct page *page;
|
|
int err = -ENOENT;
|
|
|
|
de = exofs_find_entry(dir, dentry, &page);
|
|
if (!de)
|
|
goto out;
|
|
|
|
err = exofs_delete_entry(de, page);
|
|
if (err)
|
|
goto out;
|
|
|
|
inode->i_ctime = dir->i_ctime;
|
|
inode_dec_link_count(inode);
|
|
err = 0;
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int exofs_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
int err = -ENOTEMPTY;
|
|
|
|
if (exofs_empty_dir(inode)) {
|
|
err = exofs_unlink(dir, dentry);
|
|
if (!err) {
|
|
inode->i_size = 0;
|
|
inode_dec_link_count(inode);
|
|
inode_dec_link_count(dir);
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int exofs_rename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry)
|
|
{
|
|
struct inode *old_inode = old_dentry->d_inode;
|
|
struct inode *new_inode = new_dentry->d_inode;
|
|
struct page *dir_page = NULL;
|
|
struct exofs_dir_entry *dir_de = NULL;
|
|
struct page *old_page;
|
|
struct exofs_dir_entry *old_de;
|
|
int err = -ENOENT;
|
|
|
|
old_de = exofs_find_entry(old_dir, old_dentry, &old_page);
|
|
if (!old_de)
|
|
goto out;
|
|
|
|
if (S_ISDIR(old_inode->i_mode)) {
|
|
err = -EIO;
|
|
dir_de = exofs_dotdot(old_inode, &dir_page);
|
|
if (!dir_de)
|
|
goto out_old;
|
|
}
|
|
|
|
if (new_inode) {
|
|
struct page *new_page;
|
|
struct exofs_dir_entry *new_de;
|
|
|
|
err = -ENOTEMPTY;
|
|
if (dir_de && !exofs_empty_dir(new_inode))
|
|
goto out_dir;
|
|
|
|
err = -ENOENT;
|
|
new_de = exofs_find_entry(new_dir, new_dentry, &new_page);
|
|
if (!new_de)
|
|
goto out_dir;
|
|
inode_inc_link_count(old_inode);
|
|
err = exofs_set_link(new_dir, new_de, new_page, old_inode);
|
|
new_inode->i_ctime = CURRENT_TIME;
|
|
if (dir_de)
|
|
drop_nlink(new_inode);
|
|
inode_dec_link_count(new_inode);
|
|
if (err)
|
|
goto out_dir;
|
|
} else {
|
|
if (dir_de) {
|
|
err = -EMLINK;
|
|
if (new_dir->i_nlink >= EXOFS_LINK_MAX)
|
|
goto out_dir;
|
|
}
|
|
inode_inc_link_count(old_inode);
|
|
err = exofs_add_link(new_dentry, old_inode);
|
|
if (err) {
|
|
inode_dec_link_count(old_inode);
|
|
goto out_dir;
|
|
}
|
|
if (dir_de)
|
|
inode_inc_link_count(new_dir);
|
|
}
|
|
|
|
old_inode->i_ctime = CURRENT_TIME;
|
|
|
|
exofs_delete_entry(old_de, old_page);
|
|
inode_dec_link_count(old_inode);
|
|
|
|
if (dir_de) {
|
|
err = exofs_set_link(old_inode, dir_de, dir_page, new_dir);
|
|
inode_dec_link_count(old_dir);
|
|
if (err)
|
|
goto out_dir;
|
|
}
|
|
return 0;
|
|
|
|
|
|
out_dir:
|
|
if (dir_de) {
|
|
kunmap(dir_page);
|
|
page_cache_release(dir_page);
|
|
}
|
|
out_old:
|
|
kunmap(old_page);
|
|
page_cache_release(old_page);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
const struct inode_operations exofs_dir_inode_operations = {
|
|
.create = exofs_create,
|
|
.lookup = exofs_lookup,
|
|
.link = exofs_link,
|
|
.unlink = exofs_unlink,
|
|
.symlink = exofs_symlink,
|
|
.mkdir = exofs_mkdir,
|
|
.rmdir = exofs_rmdir,
|
|
.mknod = exofs_mknod,
|
|
.rename = exofs_rename,
|
|
.setattr = exofs_setattr,
|
|
};
|
|
|
|
const struct inode_operations exofs_special_inode_operations = {
|
|
.setattr = exofs_setattr,
|
|
};
|