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/* node-create.c - Making new files.
Copyright (C) 1992,93,94,96,98,2001, 2003 Free Software Foundation
Modified for fatfs by Marco Gerards.
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, 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* This file was copied from libdiskfs and changed for fatfs. The
libdiskfs version created the "." and ".." links. After creating
those the directory was created and the "." and ".." were linked
in. In normally it is sane to do this, but this is impossible for
fatfs because fatfs doesn't support hardlinks. For fatfs the "."
and".." directory entries are created after creating the
directory. */
#include <hurd/diskfs.h>
/* This enables SysV style group behaviour. New nodes inherit the GID
of the user creating them unless the SGID bit is set of the parent
directory. */
int _diskfs_no_inherit_dir_group;
/* Create a new node. Give it MODE; if that includes IFDIR, also
initialize `.' and `..' in the new directory. Return the node in NPP.
CRED identifies the user responsible for the call. If NAME is nonzero,
then link the new node into DIR with name NAME; DS is the result of a
prior diskfs_lookup for creation (and DIR has been held locked since).
DIR must always be provided as at least a hint for disk allocation
strategies. */
error_t
diskfs_create_node (struct node *dir,
const char *name,
mode_t mode,
struct node **newnode,
struct protid *cred,
struct dirstat *ds)
{
struct node *np;
error_t err;
uid_t newuid;
gid_t newgid;
if (diskfs_check_readonly ())
{
*newnode = NULL;
return EROFS;
}
/* Make the node */
err = diskfs_alloc_node (dir, mode, newnode);
if (err)
{
if (name)
diskfs_drop_dirstat (dir, ds);
*newnode = NULL;
return err;
}
np = *newnode;
/* Initialize the on-disk fields. */
if (cred->user->uids->num)
newuid = cred->user->uids->ids[0];
else
{
newuid = dir->dn_stat.st_uid;
mode &= ~S_ISUID;
}
err = diskfs_validate_owner_change (np, newuid);
if (err)
goto change_err;
np->dn_stat.st_uid = newuid;
if (np->author_tracks_uid)
np->dn_stat.st_author = newuid;
if (!_diskfs_no_inherit_dir_group)
{
newgid = dir->dn_stat.st_gid;
if (!idvec_contains (cred->user->gids, newgid))
mode &= ~S_ISGID;
}
else
{
if (dir->dn_stat.st_mode & S_ISGID)
{
/* If the parent dir has the sgid bit set, inherit its gid.
If the new node is a directory, also inherit the sgid bit
set. */
newgid = dir->dn_stat.st_gid;
if (S_ISDIR (mode))
mode |= S_ISGID;
else
{
if (!idvec_contains (cred->user->gids, newgid))
mode &= ~S_ISGID;
}
}
else
{
if (cred->user->gids->num)
newgid = cred->user->gids->ids[0];
else
{
newgid = dir->dn_stat.st_gid;
mode &= ~S_ISGID;
}
}
}
err = diskfs_validate_group_change (np, newgid);
if (err)
goto change_err;
np->dn_stat.st_gid = newgid;
np->dn_stat.st_rdev = 0;
np->dn_stat.st_nlink = !!name;
err = diskfs_validate_mode_change (np, mode);
if (err)
goto change_err;
np->dn_stat.st_mode = mode;
np->dn_stat.st_blocks = 0;
np->dn_stat.st_size = 0;
np->dn_stat.st_flags = 0;
np->dn_set_atime = 1;
np->dn_set_mtime = 1;
np->dn_set_ctime = 1;
diskfs_node_update (np, 1);
if (err)
{
change_err:
np->dn_stat.st_mode = 0;
np->dn_stat.st_nlink = 0;
if (name)
diskfs_drop_dirstat (dir, ds);
*newnode = NULL;
return err;
}
if (name)
{
err = diskfs_direnter (dir, name, np, ds, cred);
if (err)
{
np->dn_stat.st_nlink = 0;
np->dn_set_ctime = 1;
diskfs_nput (np);
}
/* For fatfs the "." and ".." directory entries should be
created after the directory was created and not before the
directory was created. */
if (S_ISDIR (mode))
err = diskfs_init_dir (np, dir, cred);
if (err)
{
struct dirstat *ds = alloca (diskfs_dirstat_size);
struct node *foo;
/* Keep old error intact. */
error_t err;
np->dn_stat.st_nlink = 0;
err = diskfs_lookup (dir, name, REMOVE, &foo, ds, cred);
if (err)
{
/* The new node couldn't be removed, we have a big
problem now. */
*newnode = NULL;
return err;
}
err = diskfs_dirremove (dir, foo, name, ds);
if (err)
{
diskfs_nput (np);
*newnode = NULL;
return err;
}
}
diskfs_node_update (np, 1);
}
if (err)
*newnode = NULL;
return err;
}
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