/*
* Defer release of inode_info and file_info structures until the inode
* has been cleared. This avoids a race condition allowing the inode to
* be put back in use before being cleared. Also, temporarily increment
* i_count after clear_inode() so that the inode can't be reused.
*/
static void
ncp_put_inode(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
struct ncp_server *server = NCP_SERVER(inode);
struct ncp_inode_info *iinfo = NCP_INOP(inode);
struct nw_file_info *finfo = NCP_FINFO(inode);
/*
* This operation may block, so we lock before checking the count.
*/
lock_super(sb);
if (inode->i_count > 1) {
printk("ncp_put_inode: inode in use device %s, inode %ld, count=%ld\n",
kdevname(inode->i_dev), inode->i_ino, inode->i_count);
goto unlock;
}
DDPRINTK("ncp_put_inode: put %s\n",
finfo->i.entryName);
/*
* This operation should never block.
*/
if (S_ISDIR(inode->i_mode))
{
DDPRINTK("ncp_put_inode: put directory %ld\n",
inode->i_ino);
ncp_invalid_dir_cache(inode);
}
clear_inode(inode);
/*
* After clearing the inode i_count will be 0 in 2.0.xx kernels.
* To keep the inode from being reused as free if we block while
* closing the file, increment i_count temporarily.
*/
inode->i_count++;
if (finfo->opened != 0)
{
if (ncp_close_file(server, finfo->file_handle) != 0)
{
/* We can't do anything but complain. */
printk("ncp_put_inode: could not close %s\n",
finfo->i.entryName);
}
}
ncp_free_inode_info(iinfo);
inode->i_count--;
unlock:
unlock_super(sb);
}
static int
ncp_file_write(struct inode *inode, struct file *file, const char *buf,
int count)
{
int bufsize, already_written;
off_t pos;
int errno;
if (inode == NULL)
{
DPRINTK("ncp_file_write: inode = NULL\n");
return -EINVAL;
}
if (!ncp_conn_valid(NCP_SERVER(inode)))
{
return -EIO;
}
if (!S_ISREG(inode->i_mode))
{
DPRINTK("ncp_file_write: write to non-file, mode %07o\n",
inode->i_mode);
return -EINVAL;
}
DPRINTK("ncp_file_write: enter %s\n", NCP_ISTRUCT(inode)->entryName);
if (count <= 0)
{
return 0;
}
if ((errno = ncp_make_open(inode, O_RDWR)) != 0)
{
return errno;
}
pos = file->f_pos;
if (file->f_flags & O_APPEND)
{
pos = inode->i_size;
}
bufsize = NCP_SERVER(inode)->buffer_size;
already_written = 0;
while (already_written < count)
{
int written_this_time;
int to_write = min(bufsize - (pos % bufsize),
count - already_written);
if (ncp_write(NCP_SERVER(inode), NCP_FINFO(inode)->file_handle,
pos, to_write, buf, &written_this_time) != 0)
{
return -EIO;
}
pos += written_this_time;
buf += written_this_time;
already_written += written_this_time;
if (written_this_time < to_write)
{
break;
}
}
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
inode->i_dirt = 1;
file->f_pos = pos;
if (pos > inode->i_size)
{
inode->i_size = pos;
ncp_invalid_dir_cache(NCP_INOP(inode)->dir->inode);
}
DPRINTK("ncp_file_write: exit %s\n", NCP_ISTRUCT(inode)->entryName);
return already_written;
}
static void
ncp_read_inode(struct inode *inode)
{
/* Our task should be extremely simple here. We only have to
look up the information somebody else (ncp_iget) put into
the inode tree. The address of this information is the
inode->i_ino. Just to make sure everything went well, we
check it's there. */
struct ncp_inode_info *inode_info = ncp_find_inode(inode);
if (inode_info == NULL)
{
/* Ok, now we're in trouble. The inode info is not there. What
should we do now??? */
printk("ncp_read_inode: inode info not found\n");
return;
}
inode_info->state = NCP_INODE_VALID;
NCP_INOP(inode) = inode_info;
inode_info->inode = inode;
if (NCP_ISTRUCT(inode)->attributes & aDIR)
{
inode->i_mode = NCP_SERVER(inode)->m.dir_mode;
/* for directories dataStreamSize seems to be some
Object ID ??? */
inode->i_size = 512;
}
else
{
inode->i_mode = NCP_SERVER(inode)->m.file_mode;
inode->i_size = NCP_ISTRUCT(inode)->dataStreamSize;
}
DDPRINTK("ncp_read_inode: inode->i_mode = %u\n", inode->i_mode);
inode->i_nlink = 1;
inode->i_uid = NCP_SERVER(inode)->m.uid;
inode->i_gid = NCP_SERVER(inode)->m.gid;
inode->i_blksize = 512;
inode->i_rdev = 0;
if ((inode->i_blksize != 0) && (inode->i_size != 0))
{
inode->i_blocks =
(inode->i_size - 1) / inode->i_blksize + 1;
}
else
{
inode->i_blocks = 0;
}
inode->i_mtime = ncp_date_dos2unix(NCP_ISTRUCT(inode)->modifyTime,
NCP_ISTRUCT(inode)->modifyDate);
inode->i_ctime = ncp_date_dos2unix(NCP_ISTRUCT(inode)->creationTime,
NCP_ISTRUCT(inode)->creationDate);
inode->i_atime = ncp_date_dos2unix(0,
NCP_ISTRUCT(inode)->lastAccessDate);
if (S_ISREG(inode->i_mode))
{
inode->i_op = &ncp_file_inode_operations;
}
else if (S_ISDIR(inode->i_mode))
{
inode->i_op = &ncp_dir_inode_operations;
}
else
{
inode->i_op = NULL;
}
}
static int
ncp_notify_change(struct inode *inode, struct iattr *attr)
{
int result = 0;
int info_mask;
struct nw_modify_dos_info info;
if (!ncp_conn_valid(NCP_SERVER(inode)))
{
return -EIO;
}
if ((result = inode_change_ok(inode, attr)) < 0)
return result;
if (((attr->ia_valid & ATTR_UID) &&
(attr->ia_uid != NCP_SERVER(inode)->m.uid)))
return -EPERM;
if (((attr->ia_valid & ATTR_GID) &&
(attr->ia_uid != NCP_SERVER(inode)->m.gid)))
return -EPERM;
if (((attr->ia_valid & ATTR_MODE) &&
(attr->ia_mode &
~(S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO))))
return -EPERM;
info_mask = 0;
memset(&info, 0, sizeof(info));
if ((attr->ia_valid & ATTR_CTIME) != 0)
{
info_mask |= (DM_CREATE_TIME|DM_CREATE_DATE);
ncp_date_unix2dos(attr->ia_ctime,
&(info.creationTime), &(info.creationDate));
}
if ((attr->ia_valid & ATTR_MTIME) != 0)
{
info_mask |= (DM_MODIFY_TIME|DM_MODIFY_DATE);
ncp_date_unix2dos(attr->ia_mtime,
&(info.modifyTime), &(info.modifyDate));
}
if ((attr->ia_valid & ATTR_ATIME) != 0)
{
__u16 dummy;
info_mask |= (DM_LAST_ACCESS_DATE);
ncp_date_unix2dos(attr->ia_ctime,
&(dummy), &(info.lastAccessDate));
}
if (info_mask != 0)
{
if ((result =
ncp_modify_file_or_subdir_dos_info(NCP_SERVER(inode),
NCP_ISTRUCT(inode),
info_mask,
&info)) != 0)
{
result = -EACCES;
if (info_mask == (DM_CREATE_TIME|DM_CREATE_DATE))
{
/* NetWare seems not to allow this. I
do not know why. So, just tell the
user everything went fine. This is
a terrible hack, but I do not know
how to do this correctly. */
result = 0;
}
}
}
if ((attr->ia_valid & ATTR_SIZE) != 0)
{
int written;
DPRINTK("ncpfs: trying to change size of %s to %ld\n",
NCP_ISTRUCT(inode)->entryName, attr->ia_size);
if ((result = ncp_make_open(inode, O_RDWR)) < 0)
{
return -EACCES;
}
ncp_write(NCP_SERVER(inode), NCP_FINFO(inode)->file_handle,
attr->ia_size, 0, "", &written);
/* According to ndir, the changes only take effect after
closing the file */
ncp_close_file(NCP_SERVER(inode),
NCP_FINFO(inode)->file_handle);
NCP_FINFO(inode)->opened = 0;
result = 0;
}
ncp_invalid_dir_cache(NCP_INOP(inode)->dir->inode);
return result;
}
