/***** Create a file */
int msdos_create(struct inode *dir,struct dentry *dentry,int mode)
{
struct super_block *sb = dir->i_sb;
struct buffer_head *bh;
struct msdos_dir_entry *de;
struct inode *inode;
int res,is_hid;
loff_t ino;
char msdos_name[MSDOS_NAME];
res = msdos_format_name(dentry->d_name.name,dentry->d_name.len,
msdos_name, &MSDOS_SB(sb)->options);
if (res < 0)
return res;
is_hid = (dentry->d_name.name[0]=='.') && (msdos_name[0]!='.');
/* Have to do it due to foo vs. .foo conflicts */
if (fat_scan(dir,msdos_name,&bh,&de,&ino) >= 0) {
fat_brelse(sb, bh);
return -EINVAL;
}
inode = NULL;
res = msdos_add_entry(dir, msdos_name, &bh, &de, &ino, 0, is_hid);
if (res)
return res;
inode = fat_build_inode(dir->i_sb, de, ino, &res);
fat_brelse(sb, bh);
if (!inode)
return res;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(inode);
d_instantiate(dentry, inode);
return 0;
}
/***** Unlink a file */
int msdos_unlink( struct inode *dir, struct dentry *dentry)
{
struct super_block *sb = dir->i_sb;
struct inode *inode = dentry->d_inode;
int res;
loff_t ino;
struct buffer_head *bh;
struct msdos_dir_entry *de;
bh = NULL;
res = msdos_find(dir, dentry->d_name.name, dentry->d_name.len,
&bh, &de, &ino);
if (res < 0)
goto unlink_done;
de->name[0] = DELETED_FLAG;
fat_mark_buffer_dirty(sb, bh);
fat_detach(inode);
fat_brelse(sb, bh);
inode->i_nlink = 0;
inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(inode);
mark_inode_dirty(dir);
res = 0;
unlink_done:
return res;
}
/***** Get inode using directory and name */
struct dentry *msdos_lookup(struct inode *dir,struct dentry *dentry)
{
struct super_block *sb = dir->i_sb;
struct inode *inode = NULL;
struct msdos_dir_entry *de;
struct buffer_head *bh = NULL;
int res;
loff_t ino;
PRINTK (("msdos_lookup\n"));
dentry->d_op = &msdos_dentry_operations;
res = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &bh,
&de, &ino);
if (res == -ENOENT)
goto add;
if (res < 0)
goto out;
inode = fat_build_inode(sb, de, ino, &res);
if (res)
goto out;
add:
d_add(dentry, inode);
res = 0;
out:
if (bh)
fat_brelse(sb, bh);
return ERR_PTR(res);
}
/***** Rename, a wrapper for rename_same_dir & rename_diff_dir */
int msdos_rename(struct inode *old_dir,struct dentry *old_dentry,
struct inode *new_dir,struct dentry *new_dentry)
{
struct super_block *sb = old_dir->i_sb;
struct buffer_head *old_bh;
struct msdos_dir_entry *old_de;
int old_ino, error;
int is_hid,old_hid; /* if new file and old file are hidden */
char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME];
error = msdos_format_name(old_dentry->d_name.name,
old_dentry->d_name.len,old_msdos_name,
&MSDOS_SB(old_dir->i_sb)->options);
if (error < 0)
goto rename_done;
error = msdos_format_name(new_dentry->d_name.name,
new_dentry->d_name.len,new_msdos_name,
&MSDOS_SB(new_dir->i_sb)->options);
if (error < 0)
goto rename_done;
is_hid = (new_dentry->d_name.name[0]=='.') && (new_msdos_name[0]!='.');
old_hid = (old_dentry->d_name.name[0]=='.') && (old_msdos_name[0]!='.');
error = fat_scan(old_dir, old_msdos_name, &old_bh, &old_de, &old_ino);
if (error < 0)
goto rename_done;
error = do_msdos_rename(old_dir, old_msdos_name, old_dentry,
new_dir, new_msdos_name, new_dentry,
old_bh, old_de, (ino_t)old_ino, is_hid);
fat_brelse(sb, old_bh);
rename_done:
return error;
}
/***** Remove a directory */
int msdos_rmdir(struct inode *dir, struct dentry *dentry)
{
struct super_block *sb = dir->i_sb;
struct inode *inode = dentry->d_inode;
int res,ino;
struct buffer_head *bh;
struct msdos_dir_entry *de;
bh = NULL;
res = msdos_find(dir, dentry->d_name.name, dentry->d_name.len,
&bh, &de, &ino);
if (res < 0)
goto rmdir_done;
/*
* Check whether the directory is not in use, then check
* whether it is empty.
*/
res = fat_dir_empty(inode);
if (res)
goto rmdir_done;
de->name[0] = DELETED_FLAG;
fat_mark_buffer_dirty(sb, bh);
fat_detach(inode);
inode->i_nlink = 0;
inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
dir->i_nlink--;
mark_inode_dirty(inode);
mark_inode_dirty(dir);
res = 0;
rmdir_done:
fat_brelse(sb, bh);
return res;
}
static int do_msdos_rename(struct inode *old_dir, char *old_name,
struct dentry *old_dentry,
struct inode *new_dir,char *new_name, struct dentry *new_dentry,
struct buffer_head *old_bh,
struct msdos_dir_entry *old_de, loff_t old_ino, int is_hid)
{
struct super_block *sb = old_dir->i_sb;
struct buffer_head *new_bh=NULL,*dotdot_bh=NULL;
struct msdos_dir_entry *new_de,*dotdot_de;
struct inode *old_inode,*new_inode;
loff_t new_ino,dotdot_ino;
int error;
int is_dir;
old_inode = old_dentry->d_inode;
new_inode = new_dentry->d_inode;
is_dir = S_ISDIR(old_inode->i_mode);
if (fat_scan(new_dir,new_name,&new_bh,&new_de,&new_ino)>=0 &&!new_inode)
goto degenerate_case;
if (is_dir) {
if (new_inode) {
error = fat_dir_empty(new_inode);
if (error)
goto out;
}
error = fat_scan(old_inode, MSDOS_DOTDOT, &dotdot_bh,
&dotdot_de, &dotdot_ino);
if (error < 0) {
printk(KERN_WARNING
"MSDOS: %s/%s, get dotdot failed, ret=%d\n",
old_dentry->d_parent->d_name.name,
old_dentry->d_name.name, error);
goto out;
}
}
if (!new_bh) {
error = msdos_add_entry(new_dir, new_name, &new_bh, &new_de,
&new_ino, is_dir, is_hid);
if (error)
goto out;
}
new_dir->i_version = ++event;
/* There we go */
if (new_inode)
fat_detach(new_inode);
old_de->name[0] = DELETED_FLAG;
fat_mark_buffer_dirty(sb, old_bh);
fat_detach(old_inode);
fat_attach(old_inode, new_ino);
if (is_hid)
MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
else
MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
mark_inode_dirty(old_inode);
old_dir->i_version = ++event;
old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(old_dir);
if (new_inode) {
new_inode->i_nlink--;
new_inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(new_inode);
}
if (dotdot_bh) {
dotdot_de->start = CT_LE_W(MSDOS_I(new_dir)->i_logstart);
dotdot_de->starthi = CT_LE_W((MSDOS_I(new_dir)->i_logstart) >> 16);
fat_mark_buffer_dirty(sb, dotdot_bh);
old_dir->i_nlink--;
mark_inode_dirty(old_dir);
if (new_inode) {
new_inode->i_nlink--;
mark_inode_dirty(new_inode);
} else {
new_dir->i_nlink++;
mark_inode_dirty(new_dir);
}
}
error = 0;
out:
fat_brelse(sb, new_bh);
fat_brelse(sb, dotdot_bh);
return error;
degenerate_case:
error = -EINVAL;
if (new_de!=old_de)
goto out;
if (is_hid)
MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
else
MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
mark_inode_dirty(old_inode);
old_dir->i_version = ++event;
old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(old_dir);
return 0;
}
/***** Make a directory */
int msdos_mkdir(struct inode *dir,struct dentry *dentry,int mode)
{
struct super_block *sb = dir->i_sb;
struct buffer_head *bh;
struct msdos_dir_entry *de;
struct inode *inode;
int res,is_hid;
char msdos_name[MSDOS_NAME];
loff_t ino;
res = msdos_format_name(dentry->d_name.name,dentry->d_name.len,
msdos_name, &MSDOS_SB(sb)->options);
if (res < 0)
return res;
is_hid = (dentry->d_name.name[0]=='.') && (msdos_name[0]!='.');
/* foo vs .foo situation */
if (fat_scan(dir,msdos_name,&bh,&de,&ino) >= 0)
goto out_exist;
res = msdos_add_entry(dir, msdos_name, &bh, &de, &ino, 1, is_hid);
if (res)
goto out_unlock;
inode = fat_build_inode(dir->i_sb, de, ino, &res);
if (!inode) {
fat_brelse(sb, bh);
goto out_unlock;
}
res = 0;
dir->i_nlink++;
inode->i_nlink = 2; /* no need to mark them dirty */
res = fat_new_dir(inode, dir, 0);
if (res)
goto mkdir_error;
fat_brelse(sb, bh);
d_instantiate(dentry, inode);
res = 0;
out_unlock:
return res;
mkdir_error:
printk(KERN_WARNING "msdos_mkdir: error=%d, attempting cleanup\n", res);
inode->i_nlink = 0;
inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
dir->i_nlink--;
mark_inode_dirty(inode);
mark_inode_dirty(dir);
de->name[0] = DELETED_FLAG;
fat_mark_buffer_dirty(sb, bh);
fat_brelse(sb, bh);
fat_detach(inode);
iput(inode);
goto out_unlock;
out_exist:
fat_brelse(sb, bh);
res = -EINVAL;
goto out_unlock;
}
