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/*
Copyright (C) 1994 Free Software Foundation
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"
/* Implement io_write as described in <hurd/io.defs>. */
/* Implement io_write as described in <hurd/io.defs>. */
error_t
S_io_write(struct protid *cred,
char *data,
unsigned int datalen,
off_t offset,
int *amt)
{
struct node *np;
error_t err;
volatile int off = offset;
if (!cred)
return EOPNOTSUPP;
np = cred->po->np;
if (!(cred->po->openstat & O_WRITE))
return EBADF;
if (*amt < 0)
return EINVAL;
mutex_lock (&np->lock);
assert (!S_ISDIR(np->dn_stat.st_mode));
err = ioserver_get_conch (&np->conch);
if (err)
goto out;
if (off == -1)
{
if (cred->po->openstat & O_APPEND)
cred->po->filepointer = np->dn_stat.st_size;
off = cred->po->filepointer;
}
while (off + datalen > np->i_allocsize)
{
err = diskfs_grow (np, off + datalen, cred);
if (err)
goto out;
}
if (off + datalen > np->dn_stat.st_size)
np->dn_stat.st_size = off + datalen;
if (!err)
{
*amt = datalen;
err = _diskfs_rdwr_internal (np, data, off, datalen, 1);
if (offset == -1)
cred->po->filepointer += *amt;
}
out:
mutex_unlock (&np->i_toplock);
return err;
}
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