int umsdos_newentry (struct dentry *parent, struct umsdos_info *info)
{
int err, ret = -EEXIST;
err = umsdos_find (parent, info);
if (err && err == -ENOENT) {
ret = umsdos_writeentry (parent, info, 0);
Printk (("umsdos_writeentry EMD ret = %d\n", ret));
}
return ret;
}
/* #Specification: hard link / hidden name
* When a hard link is created, the original file is renamed
* to a hidden name. The name is "..LINKNNN" where NNN is a
* number define from the entry offset in the EMD file.
*/
int umsdos_newhidden (struct dentry *parent, struct umsdos_info *info)
{
int ret;
umsdos_parse ("..LINK", 6, info);
info->entry.name_len = 0;
ret = umsdos_find (parent, info);
if (ret == -ENOENT || ret == 0) {
info->entry.name_len = sprintf (info->entry.name,
"..LINK%ld", info->f_pos);
ret = 0;
}
return ret;
}
/*
Add a new entry in the emd file
Return 0 if ok or a negative error code.
Return -EEXIST if the entry already exist.
Complete the information missing in info.
*/
int umsdos_newentry (
struct inode *dir,
struct umsdos_info *info)
{
struct inode *emd_dir;
int ret = umsdos_find (dir,info,&emd_dir);
if (ret == 0){
ret = -EEXIST;
}else if (ret == -ENOENT){
ret = umsdos_writeentry(dir,emd_dir,info,0);
PRINTK (("umsdos_newentry EDM ret = %d\n",ret));
}
iput (emd_dir);
return ret;
}
/*
Locate an entry in a EMD directory.
Return 0 if ok, errcod if not, generally -ENOENT.
*/
int umsdos_findentry (
struct inode *dir,
struct umsdos_info *info,
int expect) /* 0: anything */
/* 1: file */
/* 2: directory */
{
struct inode *emd_dir;
int ret = umsdos_find (dir,info,&emd_dir);
if (ret == 0){
if (expect != 0){
if (S_ISDIR(info->entry.mode)){
if (expect != 2) ret = -EISDIR;
}else if (expect == 2){
ret = -ENOTDIR;
}
}
}
iput (emd_dir);
return ret;
}
/*
Create a new hidden link.
Return 0 if ok, an error code if not.
*/
int umsdos_newhidden (
struct inode *dir,
struct umsdos_info *info)
{
struct inode *emd_dir;
int ret;
umsdos_parse ("..LINK",6,info);
info->entry.name_len = 0;
ret = umsdos_find (dir,info,&emd_dir);
iput (emd_dir);
if (ret == -ENOENT || ret == 0){
/* #Specification: hard link / hidden name
When a hard link is created, the original file is renamed
to a hidden name. The name is "..LINKNNN" where NNN is a
number define from the entry offset in the EMD file.
*/
info->entry.name_len = sprintf (info->entry.name,"..LINK%ld"
,info->f_pos);
ret = 0;
}
return ret;
}
int umsdos_findentry (struct dentry *parent, struct umsdos_info *info,
int expect)
{
int ret;
ret = umsdos_find (parent, info);
if (ret)
goto out;
switch (expect) {
case 1:
if (S_ISDIR (info->entry.mode))
ret = -EISDIR;
break;
case 2:
if (!S_ISDIR (info->entry.mode))
ret = -ENOTDIR;
}
out:
Printk (("umsdos_findentry: returning %d\n", ret));
return ret;
}
int umsdos_delentry (struct dentry *parent, struct umsdos_info *info, int isdir)
{
int ret;
ret = umsdos_find (parent, info);
if (ret)
goto out;
if (info->entry.name_len == 0)
goto out;
if ((isdir != 0) != (S_ISDIR (info->entry.mode) != 0)) {
if (S_ISDIR (info->entry.mode)) {
ret = -EISDIR;
} else {
ret = -ENOTDIR;
}
goto out;
}
ret = umsdos_writeentry (parent, info, 1);
out:
return ret;
}
/*
Remove an entry from the emd file
Return 0 if ok, a negative error code otherwise.
Complete the information missing in info.
*/
int umsdos_delentry (
struct inode *dir,
struct umsdos_info *info,
int isdir)
{
struct inode *emd_dir;
int ret = umsdos_find (dir,info,&emd_dir);
if (ret == 0){
if (info->entry.name_len != 0){
if ((isdir != 0) != (S_ISDIR(info->entry.mode) != 0)){
if (S_ISDIR(info->entry.mode)){
ret = -EISDIR;
}else{
ret = -ENOTDIR;
}
}else{
ret = umsdos_writeentry(dir,emd_dir,info,1);
}
}
}
iput(emd_dir);
return ret;
}