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/*
Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
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. */
#include "priv.h"
#include "io_S.h"
#include <fcntl.h>
/* Implement io_write as described in <hurd/io.defs>. */
kern_return_t
diskfs_S_io_write (struct protid *cred,
char *data,
mach_msg_type_number_t datalen,
off_t offset,
mach_msg_type_number_t *amt)
{
struct node *np;
error_t err;
int off = offset;
if (!cred)
return EOPNOTSUPP;
np = cred->po->np;
if (!(cred->po->openstat & O_WRITE))
return EBADF;
mutex_lock (&np->lock);
assert (!S_ISDIR(np->dn_stat.st_mode));
iohelp_get_conch (&np->conch);
if (off == -1)
{
if (cred->po->openstat & O_APPEND)
cred->po->filepointer = np->dn_stat.st_size;
off = cred->po->filepointer;
}
if (off < 0)
{
err = EINVAL;
goto out;
}
err = 0;
while (off + (off_t) datalen > np->allocsize)
{
err = diskfs_grow (np, off + datalen, cred);
if (diskfs_synchronous)
diskfs_node_update (np, 1);
if (err)
goto out;
if (np->filemod_reqs)
diskfs_notice_filechange (np, FILE_CHANGED_EXTEND, 0, off + datalen);
}
if (off + (off_t) datalen > np->dn_stat.st_size)
{
np->dn_stat.st_size = off + datalen;
np->dn_set_ctime = 1;
if (diskfs_synchronous)
diskfs_node_update (np, 1);
}
*amt = datalen;
err = _diskfs_rdwr_internal (np, data, off, amt, 1, 0);
if (!err && offset == -1)
cred->po->filepointer += *amt;
if (!err
&& ((cred->po->openstat & O_FSYNC) || diskfs_synchronous))
diskfs_file_update (np, 1);
if (!err && np->filemod_reqs)
diskfs_notice_filechange (np, FILE_CHANGED_WRITE, off, off + *amt);
out:
mutex_unlock (&np->lock);
return err;
}
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