diff options
Diffstat (limited to 'libdiskfs/file-set-size.c')
| -rw-r--r-- | libdiskfs/file-set-size.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/libdiskfs/file-set-size.c b/libdiskfs/file-set-size.c new file mode 100644 index 00000000..18abb469 --- /dev/null +++ b/libdiskfs/file-set-size.c @@ -0,0 +1,55 @@ +/* libdiskfs implementation of fs.defs: file_set_size + Copyright (C) 1992, 1993, 1994, 1995 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" +#include "fs_S.h" +#include <fcntl.h> + +/* Implement file_set_size as described in <hurd/fs.defs>. */ +kern_return_t +diskfs_S_file_set_size (struct protid *cred, + off_t size) +{ + CHANGE_NODE_FIELD (cred, + ({ + if (!(cred->po->openstat & O_WRITE)) + err = EINVAL; + else if (size < np->dn_stat.st_size) + { + err = diskfs_truncate (np, size); + if (!err && np->filemod_reqs) + diskfs_notice_filechange (np, + FILE_CHANGED_TRUNCATE, + 0, size); + } + else if (size > np->dn_stat.st_size) + { + err = diskfs_grow (np, size, cred); + if (! err) + { + np->dn_stat.st_size = size; + np->dn_set_ctime = np->dn_set_mtime = 1; + if (np->filemod_reqs) + diskfs_notice_filechange (np, + FILE_CHANGED_EXTEND, + 0, size); + } + } + else + err = 0; /* Setting to same size. */ + })); +} |