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Index: sbin/swapon/swapon.8
===================================================================
--- sbin/swapon/swapon.8
+++ sbin/swapon/swapon.8
@@ -28,7 +28,7 @@
.\" @(#)swapon.8 8.1 (Berkeley) 6/5/93
.\" $FreeBSD$
.\"
-.Dd October 21, 2016
+.Dd June 21, 2019
.Dt SWAPON 8
.Os
.Sh NAME
@@ -38,7 +38,7 @@
.Nm swapon
.Oo Fl F Ar fstab
.Oc
-.Fl aLq | Ar
+.Fl aLq | E Ar
.Nm swapoff
.Oo Fl F Ar fstab
.Oc
@@ -86,6 +86,11 @@
option is used,
informational messages will not be
written to standard output when a swap device is added.
+The
+.Fl E
+option causes each of following devices to receive a
+.Dv BIO_DELETE
+command to mark all blocks as unused.
.Pp
The
.Nm swapoff
Index: sbin/swapon/swapon.c
===================================================================
--- sbin/swapon/swapon.c
+++ sbin/swapon/swapon.c
@@ -77,7 +77,7 @@
static enum { SWAPON, SWAPOFF, SWAPCTL } orig_prog, which_prog = SWAPCTL;
-static int qflag;
+static int Eflag, qflag;
int
main(int argc, char **argv)
@@ -100,7 +100,7 @@
doall = 0;
etc_fstab = NULL;
- while ((ch = getopt(argc, argv, "AadghklLmqsUF:")) != -1) {
+ while ((ch = getopt(argc, argv, "AadEghklLmqsUF:")) != -1) {
switch(ch) {
case 'A':
if (which_prog == SWAPCTL) {
@@ -121,6 +121,12 @@
else
usage();
break;
+ case 'E':
+ if (which_prog == SWAPON)
+ Eflag = 2;
+ else
+ usage();
+ break;
case 'g':
hflag = 'G';
break;
@@ -182,8 +188,10 @@
strstr(fsp->fs_mntops, "late") == NULL &&
late != 0)
continue;
+ Eflag |= (strstr(fsp->fs_mntops, "trimonce") != NULL);
swfile = swap_on_off(fsp->fs_spec, 1,
fsp->fs_mntops);
+ Eflag &= ~1;
if (swfile == NULL) {
ret = 1;
continue;
@@ -378,12 +386,22 @@
return (NULL);
}
} else if (strcmp(token, "notrim") == 0) {
+ if (Eflag) {
+ warn("Options \"notrim\" and "
+ "\"trimonce\" conflict");
+ free(ops);
+ return (NULL);
+ }
Tflag = " -T ";
} else if (strcmp(token, "late") == 0) {
/* ignore known option */
} else if (strcmp(token, "noauto") == 0) {
/* ignore known option */
- } else if (strcmp(token, "sw") != 0) {
+ } else if (strcmp(token, "sw") == 0) {
+ /* ignore known option */
+ } else if (strcmp(token, "trimonce") == 0) {
+ /* ignore known option */
+ } else {
warnx("Invalid option: %s", token);
free(ops);
return (NULL);
@@ -721,14 +739,42 @@
return (WEXITSTATUS(status));
}
+static void
+swap_trim(const char *name)
+{
+ struct stat sb;
+ off_t ioarg[2], sz;
+ int fd;
+
+ fd = open(name, O_WRONLY);
+ if (fd < 0)
+ errx(1, "Cannot open %s", name);
+ if (fstat(fd, &sb) < 0)
+ errx(1, "Cannot stat %s", name);
+ if (S_ISREG(sb.st_mode))
+ sz = sb.st_size;
+ else if (S_ISCHR(sb.st_mode) || S_ISBLK(sb.st_mode)) {
+ if (ioctl(fd, DIOCGMEDIASIZE, &sz) != 0)
+ err(1, "ioctl(DIOCGMEDIASIZE)");
+ } else
+ errx(1, "%s has an invalid file type", name);
+ ioarg[0] = 0;
+ ioarg[1] = sz;
+ if (ioctl(fd, DIOCGDELETE, ioarg) != 0)
+ warn(1, "ioctl(DIOCGDELETE)");
+ close(fd);
+}
+
static const char *
swap_on_off_sfile(const char *name, int doingall)
{
int error;
- if (which_prog == SWAPON)
+ if (which_prog == SWAPON) {
+ if (Eflag)
+ swap_trim(name);
error = swapon(name);
- else /* SWAPOFF */
+ } else /* SWAPOFF */
error = swapoff(name);
if (error == -1) {
@@ -759,6 +805,8 @@
fprintf(stderr, "usage: %s ", getprogname());
switch(orig_prog) {
case SWAPON:
+ fprintf(stderr, "[-F fstab] -aLq | [-E] file ...\n");
+ break;
case SWAPOFF:
fprintf(stderr, "[-F fstab] -aLq | file ...\n");
break;
Index: share/man/man5/fstab.5
===================================================================
--- share/man/man5/fstab.5
+++ share/man/man5/fstab.5
@@ -216,6 +216,12 @@
space by the
.Xr swapon 8
command at the end of the system reboot procedure.
+For swap devices, the keyword
+.Dq trimonce
+triggers the delivery of a
+.Dv BIO_DELETE
+command to the device to mark
+all blocks as unused.
For vnode-backed swap spaces,
.Dq file
is supported in the

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