From feabaf8d5389d43b404aacfcd3298bfed94a41ab Mon Sep 17 00:00:00 2001 From: Warner Losh Date: Tue, 23 Apr 2024 21:18:00 -0600 Subject: [PATCH] Revert "swapon: Do not overwrite Linux swap header" This reverts commit cf04a7775a4e8ff6fd28c768be9daa3d83dd382e.This is broken on armv7, and closer scrutiny of the reviews shows I was in error when I thought it was ready. --- sbin/swapon/Makefile | 2 -- sbin/swapon/extern.h | 5 ---- sbin/swapon/swaplinux.c | 66 ----------------------------------------- sbin/swapon/swapon.c | 54 +-------------------------------- 4 files changed, 1 insertion(+), 126 deletions(-) delete mode 100644 sbin/swapon/extern.h delete mode 100644 sbin/swapon/swaplinux.c diff --git a/sbin/swapon/Makefile b/sbin/swapon/Makefile index 930e938e5b05..27808aed5857 100644 --- a/sbin/swapon/Makefile +++ b/sbin/swapon/Makefile @@ -6,8 +6,6 @@ LINKS= ${BINDIR}/swapon ${BINDIR}/swapoff LINKS+= ${BINDIR}/swapon ${BINDIR}/swapctl MLINKS= swapon.8 swapoff.8 MLINKS+=swapon.8 swapctl.8 -SRCS= swapon.c swaplinux.c -HDRS+= extern.h LIBADD= util diff --git a/sbin/swapon/extern.h b/sbin/swapon/extern.h deleted file mode 100644 index cb33dbbee953..000000000000 --- a/sbin/swapon/extern.h +++ /dev/null @@ -1,5 +0,0 @@ -/*- - * SPDX-License-Identifier: BSD-3-Clause - */ - -int is_linux_swap(const char *); diff --git a/sbin/swapon/swaplinux.c b/sbin/swapon/swaplinux.c deleted file mode 100644 index d01a94345e68..000000000000 --- a/sbin/swapon/swaplinux.c +++ /dev/null @@ -1,66 +0,0 @@ -/*- - * SPDX-License-Identifier: BSD-3-Clause - */ - -#include -#include -#include -#include -#include - -#include "extern.h" - -/* - * Definitions and structure taken from - * https://github.com/util-linux/util-linux/blob/master/include/swapheader.h - */ - -#define SWAP_VERSION 1 -#define SWAP_UUID_LENGTH 16 -#define SWAP_LABEL_LENGTH 16 -#define SWAP_SIGNATURE "SWAPSPACE2" -#define SWAP_SIGNATURE_SZ (sizeof(SWAP_SIGNATURE) - 1) - -struct swap_header_v1_2 { - char bootbits[1024]; /* Space for disklabel etc. */ - uint32_t version; - uint32_t last_page; - uint32_t nr_badpages; - unsigned char uuid[SWAP_UUID_LENGTH]; - char volume_name[SWAP_LABEL_LENGTH]; - uint32_t padding[117]; - uint32_t badpages[1]; -}; - -typedef union { - struct swap_header_v1_2 header; - struct { - uint8_t reserved[4096 - SWAP_SIGNATURE_SZ]; - char signature[SWAP_SIGNATURE_SZ]; - } tail; -} swhdr_t; - -#define sw_version header.version -#define sw_volume_name header.volume_name -#define sw_signature tail.signature - -int -is_linux_swap(const char *name) -{ - uint8_t buf[4096]; - swhdr_t *hdr = (swhdr_t *) buf; - int fd; - - fd = open(name, O_RDONLY); - if (fd == -1) - return (-1); - - if (read(fd, buf, 4096) != 4096) { - close(fd); - return (-1); - } - close(fd); - - return (hdr->sw_version == SWAP_VERSION && - !memcmp(hdr->sw_signature, SWAP_SIGNATURE, SWAP_SIGNATURE_SZ)); -} diff --git a/sbin/swapon/swapon.c b/sbin/swapon/swapon.c index 0f2ad1f5e213..26a7dc22654a 100644 --- a/sbin/swapon/swapon.c +++ b/sbin/swapon/swapon.c @@ -54,15 +54,10 @@ #include #include -#include "extern.h" - -#define _PATH_GNOP "/sbin/gnop" - static void usage(void) __dead2; static const char *swap_on_off(const char *, int, char *); static const char *swap_on_off_gbde(const char *, int); static const char *swap_on_off_geli(const char *, char *, int); -static const char *swap_on_off_linux(const char *, int); static const char *swap_on_off_md(const char *, char *, int); static const char *swap_on_off_sfile(const char *, int); static void swaplist(int, int, int); @@ -255,13 +250,8 @@ swap_on_off(const char *name, int doingall, char *mntops) return (swap_on_off_geli(name, mntops, doingall)); } - free(basebuf); - - /* Linux swap */ - if (is_linux_swap(name)) - return (swap_on_off_linux(name, doingall)); - /* Swap on special file. */ + free(basebuf); return (swap_on_off_sfile(name, doingall)); } @@ -476,48 +466,6 @@ swap_on_off_geli(const char *name, char *mntops, int doingall) return (swap_on_off_sfile(name, doingall)); } -static const char * -swap_on_off_linux(const char *name, int doingall) -{ - const char *ret; - char *nopname; - size_t nopnamelen; - int error; - - if (which_prog == SWAPON) { - /* Skip the header for Linux swap partitions */ - error = run_cmd(NULL, "%s create -o 4096 %s", _PATH_GNOP, - name); - if (error) { - warnx("gnop (create) error: %s", name); - return (NULL); - } - } - - /* Append ".nop" to name */ - nopnamelen = strlen(name) + sizeof(".nop"); - nopname = (char *) malloc(nopnamelen); - if (nopname == NULL) - err(1, "malloc()"); - (void)strlcpy(nopname, name, nopnamelen); - (void)strlcat(nopname, ".nop", nopnamelen); - - ret = swap_on_off_sfile(nopname, doingall); - - if (which_prog == SWAPOFF) { - error = run_cmd(NULL, "%s destroy %s", _PATH_GNOP, nopname); - if (error) { - warnx("gnop (destroy) error: %s", name); - free(nopname); - return (NULL); - } - } - - free(nopname); - - return (ret); -} - static const char * swap_on_off_md(const char *name, char *mntops, int doingall) {