mirror of
https://github.com/torvalds/linux.git
synced 2024-11-27 06:31:52 +00:00
nilfs2: pathname operations
This adds pathname operations, most of which comes from the ext2 file system. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ryusuke Konishi
Linus Torvalds
parent
2ba466d74e
commit
d25006523d
446
fs/nilfs2/namei.c
Normal file
446
fs/nilfs2/namei.c
Normal file
@ -0,0 +1,446 @@
|
||||
/*
|
||||
* namei.c - NILFS pathname lookup operations.
|
||||
*
|
||||
* Copyright (C) 2005-2008 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
|
||||
*
|
||||
* Modified for NILFS by Amagai Yoshiji <amagai@osrg.net>,
|
||||
* Ryusuke Konishi <ryusuke@osrg.net>
|
||||
*/
|
||||
/*
|
||||
* linux/fs/ext2/namei.c
|
||||
*
|
||||
* 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/namei.c
|
||||
*
|
||||
* Copyright (C) 1991, 1992 Linus Torvalds
|
||||
*
|
||||
* Big-endian to little-endian byte-swapping/bitmaps by
|
||||
* David S. Miller (davem@caip.rutgers.edu), 1995
|
||||
*/
|
||||
|
||||
#include <linux/pagemap.h>
|
||||
#include "nilfs.h"
|
||||
|
||||
|
||||
static inline int nilfs_add_nondir(struct dentry *dentry, struct inode *inode)
|
||||
{
|
||||
int err = nilfs_add_link(dentry, inode);
|
||||
if (!err) {
|
||||
d_instantiate(dentry, inode);
|
||||
return 0;
|
||||
}
|
||||
inode_dec_link_count(inode);
|
||||
iput(inode);
|
||||
return err;
|
||||
}
|
||||
|
||||
/*
|
||||
* Methods themselves.
|
||||
*/
|
||||
|
||||
static struct dentry *
|
||||
nilfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
|
||||
{
|
||||
struct inode *inode;
|
||||
ino_t ino;
|
||||
|
||||
if (dentry->d_name.len > NILFS_NAME_LEN)
|
||||
return ERR_PTR(-ENAMETOOLONG);
|
||||
|
||||
ino = nilfs_inode_by_name(dir, dentry);
|
||||
inode = NULL;
|
||||
if (ino) {
|
||||
inode = nilfs_iget(dir->i_sb, ino);
|
||||
if (IS_ERR(inode))
|
||||
return ERR_CAST(inode);
|
||||
}
|
||||
return d_splice_alias(inode, dentry);
|
||||
}
|
||||
|
||||
struct dentry *nilfs_get_parent(struct dentry *child)
|
||||
{
|
||||
unsigned long ino;
|
||||
struct inode *inode;
|
||||
struct dentry dotdot;
|
||||
|
||||
dotdot.d_name.name = "..";
|
||||
dotdot.d_name.len = 2;
|
||||
|
||||
ino = nilfs_inode_by_name(child->d_inode, &dotdot);
|
||||
if (!ino)
|
||||
return ERR_PTR(-ENOENT);
|
||||
|
||||
inode = nilfs_iget(child->d_inode->i_sb, ino);
|
||||
if (IS_ERR(inode))
|
||||
return ERR_CAST(inode);
|
||||
return d_obtain_alias(inode);
|
||||
}
|
||||
|
||||
/*
|
||||
* By the time this is called, we already have created
|
||||
* the directory cache entry for the new file, but it
|
||||
* is so far negative - it has no inode.
|
||||
*
|
||||
* If the create succeeds, we fill in the inode information
|
||||
* with d_instantiate().
|
||||
*/
|
||||
static int nilfs_create(struct inode *dir, struct dentry *dentry, int mode,
|
||||
struct nameidata *nd)
|
||||
{
|
||||
struct inode *inode;
|
||||
struct nilfs_transaction_info ti;
|
||||
int err, err2;
|
||||
|
||||
err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
|
||||
if (err)
|
||||
return err;
|
||||
inode = nilfs_new_inode(dir, mode);
|
||||
err = PTR_ERR(inode);
|
||||
if (!IS_ERR(inode)) {
|
||||
inode->i_op = &nilfs_file_inode_operations;
|
||||
inode->i_fop = &nilfs_file_operations;
|
||||
inode->i_mapping->a_ops = &nilfs_aops;
|
||||
mark_inode_dirty(inode);
|
||||
err = nilfs_add_nondir(dentry, inode);
|
||||
}
|
||||
err2 = nilfs_transaction_end(dir->i_sb, !err);
|
||||
return err ? : err2;
|
||||
}
|
||||
|
||||
static int
|
||||
nilfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
|
||||
{
|
||||
struct inode *inode;
|
||||
struct nilfs_transaction_info ti;
|
||||
int err, err2;
|
||||
|
||||
if (!new_valid_dev(rdev))
|
||||
return -EINVAL;
|
||||
|
||||
err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
|
||||
if (err)
|
||||
return err;
|
||||
inode = nilfs_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 = nilfs_add_nondir(dentry, inode);
|
||||
}
|
||||
err2 = nilfs_transaction_end(dir->i_sb, !err);
|
||||
return err ? : err2;
|
||||
}
|
||||
|
||||
static int nilfs_symlink(struct inode *dir, struct dentry *dentry,
|
||||
const char *symname)
|
||||
{
|
||||
struct nilfs_transaction_info ti;
|
||||
struct super_block *sb = dir->i_sb;
|
||||
unsigned l = strlen(symname)+1;
|
||||
struct inode *inode;
|
||||
int err, err2;
|
||||
|
||||
if (l > sb->s_blocksize)
|
||||
return -ENAMETOOLONG;
|
||||
|
||||
err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
inode = nilfs_new_inode(dir, S_IFLNK | S_IRWXUGO);
|
||||
err = PTR_ERR(inode);
|
||||
if (IS_ERR(inode))
|
||||
goto out;
|
||||
|
||||
/* slow symlink */
|
||||
inode->i_op = &nilfs_symlink_inode_operations;
|
||||
inode->i_mapping->a_ops = &nilfs_aops;
|
||||
err = page_symlink(inode, symname, l);
|
||||
if (err)
|
||||
goto out_fail;
|
||||
|
||||
/* mark_inode_dirty(inode); */
|
||||
/* nilfs_new_inode() and page_symlink() do this */
|
||||
|
||||
err = nilfs_add_nondir(dentry, inode);
|
||||
out:
|
||||
err2 = nilfs_transaction_end(dir->i_sb, !err);
|
||||
return err ? : err2;
|
||||
|
||||
out_fail:
|
||||
inode_dec_link_count(inode);
|
||||
iput(inode);
|
||||
goto out;
|
||||
}
|
||||
|
||||
static int nilfs_link(struct dentry *old_dentry, struct inode *dir,
|
||||
struct dentry *dentry)
|
||||
{
|
||||
struct inode *inode = old_dentry->d_inode;
|
||||
struct nilfs_transaction_info ti;
|
||||
int err, err2;
|
||||
|
||||
if (inode->i_nlink >= NILFS_LINK_MAX)
|
||||
return -EMLINK;
|
||||
|
||||
err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
inode->i_ctime = CURRENT_TIME;
|
||||
inode_inc_link_count(inode);
|
||||
atomic_inc(&inode->i_count);
|
||||
|
||||
err = nilfs_add_nondir(dentry, inode);
|
||||
err2 = nilfs_transaction_end(dir->i_sb, !err);
|
||||
return err ? : err2;
|
||||
}
|
||||
|
||||
static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
|
||||
{
|
||||
struct inode *inode;
|
||||
struct nilfs_transaction_info ti;
|
||||
int err, err2;
|
||||
|
||||
if (dir->i_nlink >= NILFS_LINK_MAX)
|
||||
return -EMLINK;
|
||||
|
||||
err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
inode_inc_link_count(dir);
|
||||
|
||||
inode = nilfs_new_inode(dir, S_IFDIR | mode);
|
||||
err = PTR_ERR(inode);
|
||||
if (IS_ERR(inode))
|
||||
goto out_dir;
|
||||
|
||||
inode->i_op = &nilfs_dir_inode_operations;
|
||||
inode->i_fop = &nilfs_dir_operations;
|
||||
inode->i_mapping->a_ops = &nilfs_aops;
|
||||
|
||||
inode_inc_link_count(inode);
|
||||
|
||||
err = nilfs_make_empty(inode, dir);
|
||||
if (err)
|
||||
goto out_fail;
|
||||
|
||||
err = nilfs_add_link(dentry, inode);
|
||||
if (err)
|
||||
goto out_fail;
|
||||
|
||||
d_instantiate(dentry, inode);
|
||||
out:
|
||||
err2 = nilfs_transaction_end(dir->i_sb, !err);
|
||||
return err ? : err2;
|
||||
|
||||
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 nilfs_unlink(struct inode *dir, struct dentry *dentry)
|
||||
{
|
||||
struct inode *inode;
|
||||
struct nilfs_dir_entry *de;
|
||||
struct page *page;
|
||||
struct nilfs_transaction_info ti;
|
||||
int err, err2;
|
||||
|
||||
err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
err = -ENOENT;
|
||||
de = nilfs_find_entry(dir, dentry, &page);
|
||||
if (!de)
|
||||
goto out;
|
||||
|
||||
inode = dentry->d_inode;
|
||||
err = -EIO;
|
||||
if (le64_to_cpu(de->inode) != inode->i_ino)
|
||||
goto out;
|
||||
|
||||
if (!inode->i_nlink) {
|
||||
nilfs_warning(inode->i_sb, __func__,
|
||||
"deleting nonexistent file (%lu), %d\n",
|
||||
inode->i_ino, inode->i_nlink);
|
||||
inode->i_nlink = 1;
|
||||
}
|
||||
err = nilfs_delete_entry(de, page);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
inode->i_ctime = dir->i_ctime;
|
||||
inode_dec_link_count(inode);
|
||||
err = 0;
|
||||
out:
|
||||
err2 = nilfs_transaction_end(dir->i_sb, !err);
|
||||
return err ? : err2;
|
||||
}
|
||||
|
||||
static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
|
||||
{
|
||||
struct inode *inode = dentry->d_inode;
|
||||
struct nilfs_transaction_info ti;
|
||||
int err, err2;
|
||||
|
||||
err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
err = -ENOTEMPTY;
|
||||
if (nilfs_empty_dir(inode)) {
|
||||
err = nilfs_unlink(dir, dentry);
|
||||
if (!err) {
|
||||
inode->i_size = 0;
|
||||
inode_dec_link_count(inode);
|
||||
inode_dec_link_count(dir);
|
||||
}
|
||||
}
|
||||
err2 = nilfs_transaction_end(dir->i_sb, !err);
|
||||
return err ? : err2;
|
||||
}
|
||||
|
||||
static int nilfs_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 nilfs_dir_entry *dir_de = NULL;
|
||||
struct page *old_page;
|
||||
struct nilfs_dir_entry *old_de;
|
||||
struct nilfs_transaction_info ti;
|
||||
int err;
|
||||
|
||||
err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
|
||||
if (unlikely(err))
|
||||
return err;
|
||||
|
||||
err = -ENOENT;
|
||||
old_de = nilfs_find_entry(old_dir, old_dentry, &old_page);
|
||||
if (!old_de)
|
||||
goto out;
|
||||
|
||||
if (S_ISDIR(old_inode->i_mode)) {
|
||||
err = -EIO;
|
||||
dir_de = nilfs_dotdot(old_inode, &dir_page);
|
||||
if (!dir_de)
|
||||
goto out_old;
|
||||
}
|
||||
|
||||
if (new_inode) {
|
||||
struct page *new_page;
|
||||
struct nilfs_dir_entry *new_de;
|
||||
|
||||
err = -ENOTEMPTY;
|
||||
if (dir_de && !nilfs_empty_dir(new_inode))
|
||||
goto out_dir;
|
||||
|
||||
err = -ENOENT;
|
||||
new_de = nilfs_find_entry(new_dir, new_dentry, &new_page);
|
||||
if (!new_de)
|
||||
goto out_dir;
|
||||
inode_inc_link_count(old_inode);
|
||||
nilfs_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);
|
||||
} else {
|
||||
if (dir_de) {
|
||||
err = -EMLINK;
|
||||
if (new_dir->i_nlink >= NILFS_LINK_MAX)
|
||||
goto out_dir;
|
||||
}
|
||||
inode_inc_link_count(old_inode);
|
||||
err = nilfs_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);
|
||||
}
|
||||
|
||||
/*
|
||||
* Like most other Unix systems, set the ctime for inodes on a
|
||||
* rename.
|
||||
* inode_dec_link_count() will mark the inode dirty.
|
||||
*/
|
||||
old_inode->i_ctime = CURRENT_TIME;
|
||||
|
||||
nilfs_delete_entry(old_de, old_page);
|
||||
inode_dec_link_count(old_inode);
|
||||
|
||||
if (dir_de) {
|
||||
nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
|
||||
inode_dec_link_count(old_dir);
|
||||
}
|
||||
|
||||
err = nilfs_transaction_end(old_dir->i_sb, 1);
|
||||
return err;
|
||||
|
||||
out_dir:
|
||||
if (dir_de) {
|
||||
kunmap(dir_page);
|
||||
page_cache_release(dir_page);
|
||||
}
|
||||
out_old:
|
||||
kunmap(old_page);
|
||||
page_cache_release(old_page);
|
||||
out:
|
||||
nilfs_transaction_end(old_dir->i_sb, 0);
|
||||
return err;
|
||||
}
|
||||
|
||||
struct inode_operations nilfs_dir_inode_operations = {
|
||||
.create = nilfs_create,
|
||||
.lookup = nilfs_lookup,
|
||||
.link = nilfs_link,
|
||||
.unlink = nilfs_unlink,
|
||||
.symlink = nilfs_symlink,
|
||||
.mkdir = nilfs_mkdir,
|
||||
.rmdir = nilfs_rmdir,
|
||||
.mknod = nilfs_mknod,
|
||||
.rename = nilfs_rename,
|
||||
.setattr = nilfs_setattr,
|
||||
.permission = nilfs_permission,
|
||||
};
|
||||
|
||||
struct inode_operations nilfs_special_inode_operations = {
|
||||
.setattr = nilfs_setattr,
|
||||
.permission = nilfs_permission,
|
||||
};
|
||||
|
||||
struct inode_operations nilfs_symlink_inode_operations = {
|
||||
.readlink = generic_readlink,
|
||||
.follow_link = page_follow_link_light,
|
||||
.put_link = page_put_link,
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user