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Code Issues Releases Wiki Activity

fallocate: Add truncate (-t) option 

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
bitmap-optimize
Theodore Ts'o 2010-03-22 22:03:53 -04:00
parent 3c67a9f792
commit c561e751a1
1 changed files with 21 additions and 5 deletions
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26
contrib/fallocate.c
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@ -21,7 +21,6 @@
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define _GNU_SOURCE
#define _LARGEFILE_SOURCE
#define _LARGEFILE64_SOURCE
@ -39,7 +38,7 @@
void usage(void)
{
printf("Usage: fallocate [-n] [-o offset] -l length filename\n");
printf("Usage: fallocate [-nt] [-o offset] -l length filename\n");
exit(EXIT_FAILURE);
}
@ -93,8 +92,9 @@ int main(int argc, char **argv)
loff_t offset = 0;
int falloc_mode = 0;
int error;
int tflag = 0;
while ((opt = getopt(argc, argv, "nl:o:")) != -1) {
while ((opt = getopt(argc, argv, "nl:ot")) != -1) {
switch(opt) {
case 'n':
/* do not change filesize */
@ -106,6 +106,9 @@ int main(int argc, char **argv)
case 'o':
offset = cvtnum(optarg);
break;
case 't':
tflag++;
break;
default:
usage();
}
@ -126,6 +129,16 @@ int main(int argc, char **argv)
usage();
}
if (tflag && (falloc_mode & FALLOC_FL_KEEP_SIZE)) {
printf("-n and -t options incompatible\n");
usage();
}
if (tflag && offset) {
printf("-n and -o options incompatible\n");
usage();
}
if (optind == argc) {
printf("Error: no filename specified\n");
usage();
@ -134,13 +147,16 @@ int main(int argc, char **argv)
fname = argv[optind++];
/* Should we create the file if it doesn't already exist? */
fd = open(fname, O_WRONLY|O_DIRECTORY);
fd = open(fname, O_WRONLY|O_LARGEFILE);
if (fd < 0) {
perror("Error opening file");
exit(EXIT_FAILURE);
}
error = syscall(SYS_fallocate, fd, falloc_mode, offset, length);
if (tflag)
error = ftruncate(fd, length);
else
error = syscall(SYS_fallocate, fd, falloc_mode, offset, length);
if (error < 0) {
perror("fallocate failed");