forked from luck/tmp_suning_uos_patched
1a67aafb5f
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
590 lines
13 KiB
C
590 lines
13 KiB
C
/*
|
|
* 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"
|
|
#include "export.h"
|
|
|
|
#define NILFS_FID_SIZE_NON_CONNECTABLE \
|
|
(offsetof(struct nilfs_fid, parent_gen) / 4)
|
|
#define NILFS_FID_SIZE_CONNECTABLE (sizeof(struct nilfs_fid) / 4)
|
|
|
|
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->d_name);
|
|
inode = ino ? nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino) : NULL;
|
|
return d_splice_alias(inode, dentry);
|
|
}
|
|
|
|
/*
|
|
* 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, umode_t mode,
|
|
struct nameidata *nd)
|
|
{
|
|
struct inode *inode;
|
|
struct nilfs_transaction_info ti;
|
|
int err;
|
|
|
|
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;
|
|
nilfs_mark_inode_dirty(inode);
|
|
err = nilfs_add_nondir(dentry, inode);
|
|
}
|
|
if (!err)
|
|
err = nilfs_transaction_commit(dir->i_sb);
|
|
else
|
|
nilfs_transaction_abort(dir->i_sb);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
nilfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
|
|
{
|
|
struct inode *inode;
|
|
struct nilfs_transaction_info ti;
|
|
int err;
|
|
|
|
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);
|
|
nilfs_mark_inode_dirty(inode);
|
|
err = nilfs_add_nondir(dentry, inode);
|
|
}
|
|
if (!err)
|
|
err = nilfs_transaction_commit(dir->i_sb);
|
|
else
|
|
nilfs_transaction_abort(dir->i_sb);
|
|
|
|
return err;
|
|
}
|
|
|
|
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;
|
|
|
|
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); */
|
|
/* page_symlink() do this */
|
|
|
|
err = nilfs_add_nondir(dentry, inode);
|
|
out:
|
|
if (!err)
|
|
err = nilfs_transaction_commit(dir->i_sb);
|
|
else
|
|
nilfs_transaction_abort(dir->i_sb);
|
|
|
|
return err;
|
|
|
|
out_fail:
|
|
drop_nlink(inode);
|
|
nilfs_mark_inode_dirty(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;
|
|
|
|
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);
|
|
ihold(inode);
|
|
|
|
err = nilfs_add_nondir(dentry, inode);
|
|
if (!err)
|
|
err = nilfs_transaction_commit(dir->i_sb);
|
|
else
|
|
nilfs_transaction_abort(dir->i_sb);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
|
|
{
|
|
struct inode *inode;
|
|
struct nilfs_transaction_info ti;
|
|
int err;
|
|
|
|
if (dir->i_nlink >= NILFS_LINK_MAX)
|
|
return -EMLINK;
|
|
|
|
err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
|
|
if (err)
|
|
return err;
|
|
|
|
inc_nlink(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;
|
|
|
|
inc_nlink(inode);
|
|
|
|
err = nilfs_make_empty(inode, dir);
|
|
if (err)
|
|
goto out_fail;
|
|
|
|
err = nilfs_add_link(dentry, inode);
|
|
if (err)
|
|
goto out_fail;
|
|
|
|
nilfs_mark_inode_dirty(inode);
|
|
d_instantiate(dentry, inode);
|
|
out:
|
|
if (!err)
|
|
err = nilfs_transaction_commit(dir->i_sb);
|
|
else
|
|
nilfs_transaction_abort(dir->i_sb);
|
|
|
|
return err;
|
|
|
|
out_fail:
|
|
drop_nlink(inode);
|
|
drop_nlink(inode);
|
|
nilfs_mark_inode_dirty(inode);
|
|
iput(inode);
|
|
out_dir:
|
|
drop_nlink(dir);
|
|
nilfs_mark_inode_dirty(dir);
|
|
goto out;
|
|
}
|
|
|
|
static int nilfs_do_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct inode *inode;
|
|
struct nilfs_dir_entry *de;
|
|
struct page *page;
|
|
int err;
|
|
|
|
err = -ENOENT;
|
|
de = nilfs_find_entry(dir, &dentry->d_name, &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);
|
|
set_nlink(inode, 1);
|
|
}
|
|
err = nilfs_delete_entry(de, page);
|
|
if (err)
|
|
goto out;
|
|
|
|
inode->i_ctime = dir->i_ctime;
|
|
drop_nlink(inode);
|
|
err = 0;
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct nilfs_transaction_info ti;
|
|
int err;
|
|
|
|
err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
|
|
if (err)
|
|
return err;
|
|
|
|
err = nilfs_do_unlink(dir, dentry);
|
|
|
|
if (!err) {
|
|
nilfs_mark_inode_dirty(dir);
|
|
nilfs_mark_inode_dirty(dentry->d_inode);
|
|
err = nilfs_transaction_commit(dir->i_sb);
|
|
} else
|
|
nilfs_transaction_abort(dir->i_sb);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct nilfs_transaction_info ti;
|
|
int err;
|
|
|
|
err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
|
|
if (err)
|
|
return err;
|
|
|
|
err = -ENOTEMPTY;
|
|
if (nilfs_empty_dir(inode)) {
|
|
err = nilfs_do_unlink(dir, dentry);
|
|
if (!err) {
|
|
inode->i_size = 0;
|
|
drop_nlink(inode);
|
|
nilfs_mark_inode_dirty(inode);
|
|
drop_nlink(dir);
|
|
nilfs_mark_inode_dirty(dir);
|
|
}
|
|
}
|
|
if (!err)
|
|
err = nilfs_transaction_commit(dir->i_sb);
|
|
else
|
|
nilfs_transaction_abort(dir->i_sb);
|
|
|
|
return err;
|
|
}
|
|
|
|
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->d_name, &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->d_name, &new_page);
|
|
if (!new_de)
|
|
goto out_dir;
|
|
nilfs_set_link(new_dir, new_de, new_page, old_inode);
|
|
nilfs_mark_inode_dirty(new_dir);
|
|
new_inode->i_ctime = CURRENT_TIME;
|
|
if (dir_de)
|
|
drop_nlink(new_inode);
|
|
drop_nlink(new_inode);
|
|
nilfs_mark_inode_dirty(new_inode);
|
|
} else {
|
|
if (dir_de) {
|
|
err = -EMLINK;
|
|
if (new_dir->i_nlink >= NILFS_LINK_MAX)
|
|
goto out_dir;
|
|
}
|
|
err = nilfs_add_link(new_dentry, old_inode);
|
|
if (err)
|
|
goto out_dir;
|
|
if (dir_de) {
|
|
inc_nlink(new_dir);
|
|
nilfs_mark_inode_dirty(new_dir);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Like most other Unix systems, set the ctime for inodes on a
|
|
* rename.
|
|
*/
|
|
old_inode->i_ctime = CURRENT_TIME;
|
|
|
|
nilfs_delete_entry(old_de, old_page);
|
|
|
|
if (dir_de) {
|
|
nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
|
|
drop_nlink(old_dir);
|
|
}
|
|
nilfs_mark_inode_dirty(old_dir);
|
|
nilfs_mark_inode_dirty(old_inode);
|
|
|
|
err = nilfs_transaction_commit(old_dir->i_sb);
|
|
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_abort(old_dir->i_sb);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Export operations
|
|
*/
|
|
static struct dentry *nilfs_get_parent(struct dentry *child)
|
|
{
|
|
unsigned long ino;
|
|
struct inode *inode;
|
|
struct qstr dotdot = {.name = "..", .len = 2};
|
|
struct nilfs_root *root;
|
|
|
|
ino = nilfs_inode_by_name(child->d_inode, &dotdot);
|
|
if (!ino)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
root = NILFS_I(child->d_inode)->i_root;
|
|
|
|
inode = nilfs_iget(child->d_inode->i_sb, root, ino);
|
|
if (IS_ERR(inode))
|
|
return ERR_CAST(inode);
|
|
|
|
return d_obtain_alias(inode);
|
|
}
|
|
|
|
static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno,
|
|
u64 ino, u32 gen)
|
|
{
|
|
struct nilfs_root *root;
|
|
struct inode *inode;
|
|
|
|
if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
|
|
return ERR_PTR(-ESTALE);
|
|
|
|
root = nilfs_lookup_root(sb->s_fs_info, cno);
|
|
if (!root)
|
|
return ERR_PTR(-ESTALE);
|
|
|
|
inode = nilfs_iget(sb, root, ino);
|
|
nilfs_put_root(root);
|
|
|
|
if (IS_ERR(inode))
|
|
return ERR_CAST(inode);
|
|
if (gen && inode->i_generation != gen) {
|
|
iput(inode);
|
|
return ERR_PTR(-ESTALE);
|
|
}
|
|
return d_obtain_alias(inode);
|
|
}
|
|
|
|
static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
|
|
int fh_len, int fh_type)
|
|
{
|
|
struct nilfs_fid *fid = (struct nilfs_fid *)fh;
|
|
|
|
if ((fh_len != NILFS_FID_SIZE_NON_CONNECTABLE &&
|
|
fh_len != NILFS_FID_SIZE_CONNECTABLE) ||
|
|
(fh_type != FILEID_NILFS_WITH_PARENT &&
|
|
fh_type != FILEID_NILFS_WITHOUT_PARENT))
|
|
return NULL;
|
|
|
|
return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
|
|
}
|
|
|
|
static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh,
|
|
int fh_len, int fh_type)
|
|
{
|
|
struct nilfs_fid *fid = (struct nilfs_fid *)fh;
|
|
|
|
if (fh_len != NILFS_FID_SIZE_CONNECTABLE ||
|
|
fh_type != FILEID_NILFS_WITH_PARENT)
|
|
return NULL;
|
|
|
|
return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
|
|
}
|
|
|
|
static int nilfs_encode_fh(struct dentry *dentry, __u32 *fh, int *lenp,
|
|
int connectable)
|
|
{
|
|
struct nilfs_fid *fid = (struct nilfs_fid *)fh;
|
|
struct inode *inode = dentry->d_inode;
|
|
struct nilfs_root *root = NILFS_I(inode)->i_root;
|
|
int type;
|
|
|
|
if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE ||
|
|
(connectable && *lenp < NILFS_FID_SIZE_CONNECTABLE))
|
|
return 255;
|
|
|
|
fid->cno = root->cno;
|
|
fid->ino = inode->i_ino;
|
|
fid->gen = inode->i_generation;
|
|
|
|
if (connectable && !S_ISDIR(inode->i_mode)) {
|
|
struct inode *parent;
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
parent = dentry->d_parent->d_inode;
|
|
fid->parent_ino = parent->i_ino;
|
|
fid->parent_gen = parent->i_generation;
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
type = FILEID_NILFS_WITH_PARENT;
|
|
*lenp = NILFS_FID_SIZE_CONNECTABLE;
|
|
} else {
|
|
type = FILEID_NILFS_WITHOUT_PARENT;
|
|
*lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
|
|
}
|
|
|
|
return type;
|
|
}
|
|
|
|
const 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,
|
|
.fiemap = nilfs_fiemap,
|
|
};
|
|
|
|
const struct inode_operations nilfs_special_inode_operations = {
|
|
.setattr = nilfs_setattr,
|
|
.permission = nilfs_permission,
|
|
};
|
|
|
|
const struct inode_operations nilfs_symlink_inode_operations = {
|
|
.readlink = generic_readlink,
|
|
.follow_link = page_follow_link_light,
|
|
.put_link = page_put_link,
|
|
.permission = nilfs_permission,
|
|
};
|
|
|
|
const struct export_operations nilfs_export_ops = {
|
|
.encode_fh = nilfs_encode_fh,
|
|
.fh_to_dentry = nilfs_fh_to_dentry,
|
|
.fh_to_parent = nilfs_fh_to_parent,
|
|
.get_parent = nilfs_get_parent,
|
|
};
|