364 строки
7.6 KiB
C
364 строки
7.6 KiB
C
/*
|
|
* linux/fs/ufs/namei.c
|
|
*
|
|
* Copyright (C) 1998
|
|
* Daniel Pirkl <daniel.pirkl@email.cz>
|
|
* Charles University, Faculty of Mathematics and Physics
|
|
*
|
|
* from
|
|
*
|
|
* 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/time.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/ufs_fs.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/buffer_head.h>
|
|
#include "swab.h" /* will go away - see comment in mknod() */
|
|
#include "util.h"
|
|
|
|
/*
|
|
#undef UFS_NAMEI_DEBUG
|
|
*/
|
|
#define UFS_NAMEI_DEBUG
|
|
|
|
#ifdef UFS_NAMEI_DEBUG
|
|
#define UFSD(x) printk("(%s, %d), %s: ", __FILE__, __LINE__, __FUNCTION__); printk x;
|
|
#else
|
|
#define UFSD(x)
|
|
#endif
|
|
|
|
static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode)
|
|
{
|
|
int err = ufs_add_link(dentry, inode);
|
|
if (!err) {
|
|
d_instantiate(dentry, inode);
|
|
return 0;
|
|
}
|
|
inode_dec_link_count(inode);
|
|
iput(inode);
|
|
return err;
|
|
}
|
|
|
|
static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
struct inode * inode = NULL;
|
|
ino_t ino;
|
|
|
|
if (dentry->d_name.len > UFS_MAXNAMLEN)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
lock_kernel();
|
|
ino = ufs_inode_by_name(dir, dentry);
|
|
if (ino) {
|
|
inode = iget(dir->i_sb, ino);
|
|
if (!inode) {
|
|
unlock_kernel();
|
|
return ERR_PTR(-EACCES);
|
|
}
|
|
}
|
|
unlock_kernel();
|
|
d_add(dentry, inode);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* 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 ufs_create (struct inode * dir, struct dentry * dentry, int mode,
|
|
struct nameidata *nd)
|
|
{
|
|
struct inode * inode = ufs_new_inode(dir, mode);
|
|
int err = PTR_ERR(inode);
|
|
if (!IS_ERR(inode)) {
|
|
inode->i_op = &ufs_file_inode_operations;
|
|
inode->i_fop = &ufs_file_operations;
|
|
inode->i_mapping->a_ops = &ufs_aops;
|
|
mark_inode_dirty(inode);
|
|
lock_kernel();
|
|
err = ufs_add_nondir(dentry, inode);
|
|
unlock_kernel();
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int ufs_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev)
|
|
{
|
|
struct inode *inode;
|
|
int err;
|
|
|
|
if (!old_valid_dev(rdev))
|
|
return -EINVAL;
|
|
inode = ufs_new_inode(dir, mode);
|
|
err = PTR_ERR(inode);
|
|
if (!IS_ERR(inode)) {
|
|
init_special_inode(inode, mode, rdev);
|
|
/* NOTE: that'll go when we get wide dev_t */
|
|
ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
|
|
mark_inode_dirty(inode);
|
|
lock_kernel();
|
|
err = ufs_add_nondir(dentry, inode);
|
|
unlock_kernel();
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int ufs_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;
|
|
|
|
if (l > sb->s_blocksize)
|
|
goto out;
|
|
|
|
lock_kernel();
|
|
inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO);
|
|
err = PTR_ERR(inode);
|
|
if (IS_ERR(inode))
|
|
goto out;
|
|
|
|
if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
|
|
/* slow symlink */
|
|
inode->i_op = &page_symlink_inode_operations;
|
|
inode->i_mapping->a_ops = &ufs_aops;
|
|
err = page_symlink(inode, symname, l);
|
|
if (err)
|
|
goto out_fail;
|
|
} else {
|
|
/* fast symlink */
|
|
inode->i_op = &ufs_fast_symlink_inode_operations;
|
|
memcpy((char*)&UFS_I(inode)->i_u1.i_data,symname,l);
|
|
inode->i_size = l-1;
|
|
}
|
|
mark_inode_dirty(inode);
|
|
|
|
err = ufs_add_nondir(dentry, inode);
|
|
out:
|
|
unlock_kernel();
|
|
return err;
|
|
|
|
out_fail:
|
|
inode_dec_link_count(inode);
|
|
iput(inode);
|
|
goto out;
|
|
}
|
|
|
|
static int ufs_link (struct dentry * old_dentry, struct inode * dir,
|
|
struct dentry *dentry)
|
|
{
|
|
struct inode *inode = old_dentry->d_inode;
|
|
int error;
|
|
|
|
lock_kernel();
|
|
if (inode->i_nlink >= UFS_LINK_MAX) {
|
|
unlock_kernel();
|
|
return -EMLINK;
|
|
}
|
|
|
|
inode->i_ctime = CURRENT_TIME_SEC;
|
|
inode_inc_link_count(inode);
|
|
atomic_inc(&inode->i_count);
|
|
|
|
error = ufs_add_nondir(dentry, inode);
|
|
unlock_kernel();
|
|
return error;
|
|
}
|
|
|
|
static int ufs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
|
|
{
|
|
struct inode * inode;
|
|
int err = -EMLINK;
|
|
|
|
if (dir->i_nlink >= UFS_LINK_MAX)
|
|
goto out;
|
|
|
|
lock_kernel();
|
|
inode_inc_link_count(dir);
|
|
|
|
inode = ufs_new_inode(dir, S_IFDIR|mode);
|
|
err = PTR_ERR(inode);
|
|
if (IS_ERR(inode))
|
|
goto out_dir;
|
|
|
|
inode->i_op = &ufs_dir_inode_operations;
|
|
inode->i_fop = &ufs_dir_operations;
|
|
|
|
inode_inc_link_count(inode);
|
|
|
|
err = ufs_make_empty(inode, dir);
|
|
if (err)
|
|
goto out_fail;
|
|
|
|
err = ufs_add_link(dentry, inode);
|
|
if (err)
|
|
goto out_fail;
|
|
unlock_kernel();
|
|
|
|
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);
|
|
unlock_kernel();
|
|
goto out;
|
|
}
|
|
|
|
static int ufs_unlink(struct inode * dir, struct dentry *dentry)
|
|
{
|
|
struct inode * inode = dentry->d_inode;
|
|
struct buffer_head * bh;
|
|
struct ufs_dir_entry * de;
|
|
int err = -ENOENT;
|
|
|
|
lock_kernel();
|
|
de = ufs_find_entry (dentry, &bh);
|
|
if (!de)
|
|
goto out;
|
|
|
|
err = ufs_delete_entry (dir, de, bh);
|
|
if (err)
|
|
goto out;
|
|
|
|
inode->i_ctime = dir->i_ctime;
|
|
inode_dec_link_count(inode);
|
|
err = 0;
|
|
out:
|
|
unlock_kernel();
|
|
return err;
|
|
}
|
|
|
|
static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
|
|
{
|
|
struct inode * inode = dentry->d_inode;
|
|
int err= -ENOTEMPTY;
|
|
|
|
lock_kernel();
|
|
if (ufs_empty_dir (inode)) {
|
|
err = ufs_unlink(dir, dentry);
|
|
if (!err) {
|
|
inode->i_size = 0;
|
|
inode_dec_link_count(inode);
|
|
inode_dec_link_count(dir);
|
|
}
|
|
}
|
|
unlock_kernel();
|
|
return err;
|
|
}
|
|
|
|
static int ufs_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 buffer_head *dir_bh = NULL;
|
|
struct ufs_dir_entry *dir_de = NULL;
|
|
struct buffer_head *old_bh;
|
|
struct ufs_dir_entry *old_de;
|
|
int err = -ENOENT;
|
|
|
|
lock_kernel();
|
|
old_de = ufs_find_entry (old_dentry, &old_bh);
|
|
if (!old_de)
|
|
goto out;
|
|
|
|
if (S_ISDIR(old_inode->i_mode)) {
|
|
err = -EIO;
|
|
dir_de = ufs_dotdot(old_inode, &dir_bh);
|
|
if (!dir_de)
|
|
goto out_old;
|
|
}
|
|
|
|
if (new_inode) {
|
|
struct buffer_head *new_bh;
|
|
struct ufs_dir_entry *new_de;
|
|
|
|
err = -ENOTEMPTY;
|
|
if (dir_de && !ufs_empty_dir (new_inode))
|
|
goto out_dir;
|
|
err = -ENOENT;
|
|
new_de = ufs_find_entry (new_dentry, &new_bh);
|
|
if (!new_de)
|
|
goto out_dir;
|
|
inode_inc_link_count(old_inode);
|
|
ufs_set_link(new_dir, new_de, new_bh, old_inode);
|
|
new_inode->i_ctime = CURRENT_TIME_SEC;
|
|
if (dir_de)
|
|
new_inode->i_nlink--;
|
|
inode_dec_link_count(new_inode);
|
|
} else {
|
|
if (dir_de) {
|
|
err = -EMLINK;
|
|
if (new_dir->i_nlink >= UFS_LINK_MAX)
|
|
goto out_dir;
|
|
}
|
|
inode_inc_link_count(old_inode);
|
|
err = ufs_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);
|
|
}
|
|
|
|
ufs_delete_entry (old_dir, old_de, old_bh);
|
|
|
|
inode_dec_link_count(old_inode);
|
|
|
|
if (dir_de) {
|
|
ufs_set_link(old_inode, dir_de, dir_bh, new_dir);
|
|
inode_dec_link_count(old_dir);
|
|
}
|
|
unlock_kernel();
|
|
return 0;
|
|
|
|
out_dir:
|
|
if (dir_de)
|
|
brelse(dir_bh);
|
|
out_old:
|
|
brelse (old_bh);
|
|
out:
|
|
unlock_kernel();
|
|
return err;
|
|
}
|
|
|
|
struct inode_operations ufs_dir_inode_operations = {
|
|
.create = ufs_create,
|
|
.lookup = ufs_lookup,
|
|
.link = ufs_link,
|
|
.unlink = ufs_unlink,
|
|
.symlink = ufs_symlink,
|
|
.mkdir = ufs_mkdir,
|
|
.rmdir = ufs_rmdir,
|
|
.mknod = ufs_mknod,
|
|
.rename = ufs_rename,
|
|
};
|