diff options
Diffstat (limited to 'libblkid/src/superblocks/swap.c')
| -rw-r--r-- | libblkid/src/superblocks/swap.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/libblkid/src/superblocks/swap.c b/libblkid/src/superblocks/swap.c new file mode 100644 index 0000000..fcdb13b --- /dev/null +++ b/libblkid/src/superblocks/swap.c @@ -0,0 +1,178 @@ +/* + * Copyright (C) 1999 by Andries Brouwer + * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o + * Copyright (C) 2001 by Andreas Dilger + * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> + * Copyright (C) 2008 Karel Zak <kzak@redhat.com> + * + * This file may be redistributed under the terms of the + * GNU Lesser General Public License. + */ +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <errno.h> +#include <ctype.h> +#include <stdint.h> + +#include "superblocks.h" + +/* linux-2.6/include/linux/swap.h */ +struct swap_header_v1_2 { + /* char bootbits[1024]; */ /* Space for disklabel etc. */ + uint32_t version; + uint32_t lastpage; + uint32_t nr_badpages; + unsigned char uuid[16]; + unsigned char volume[16]; + uint32_t padding[117]; + uint32_t badpages[1]; +} __attribute__((packed)); + +#define PAGESIZE_MIN 0xff6 /* 4086 (arm, i386, ...) */ +#define PAGESIZE_MAX 0xfff6 /* 65526 (ia64) */ + +#define TOI_MAGIC_STRING "\xed\xc3\x02\xe9\x98\x56\xe5\x0c" +#define TOI_MAGIC_STRLEN (sizeof(TOI_MAGIC_STRING) - 1) + +static int swap_set_info(blkid_probe pr, const char *version) +{ + struct swap_header_v1_2 *hdr; + + /* Swap header always located at offset of 1024 bytes */ + hdr = (struct swap_header_v1_2 *) blkid_probe_get_buffer(pr, 1024, + sizeof(struct swap_header_v1_2)); + if (!hdr) + return errno ? -errno : 1; + + /* SWAPSPACE2 - check for wrong version or zeroed pagecount */ + if (strcmp(version, "1") == 0) { + if (hdr->version != 1 && swab32(hdr->version) != 1) { + DBG(LOWPROBE, ul_debug("incorrect swap version")); + return 1; + } + if (hdr->lastpage == 0) { + DBG(LOWPROBE, ul_debug("not set last swap page")); + return 1; + } + } + + /* arbitrary sanity check.. is there any garbage down there? */ + if (hdr->padding[32] == 0 && hdr->padding[33] == 0) { + if (hdr->volume[0] && blkid_probe_set_label(pr, hdr->volume, + sizeof(hdr->volume)) < 0) + return 1; + if (blkid_probe_set_uuid(pr, hdr->uuid) < 0) + return 1; + } + + blkid_probe_set_version(pr, version); + return 0; +} + +static int probe_swap(blkid_probe pr, const struct blkid_idmag *mag) +{ + unsigned char *buf; + + if (!mag) + return 1; + + /* TuxOnIce keeps valid swap header at the end of the 1st page */ + buf = blkid_probe_get_buffer(pr, 0, TOI_MAGIC_STRLEN); + if (!buf) + return errno ? -errno : 1; + + if (memcmp(buf, TOI_MAGIC_STRING, TOI_MAGIC_STRLEN) == 0) + return 1; /* Ignore swap signature, it's TuxOnIce */ + + if (!memcmp(mag->magic, "SWAP-SPACE", mag->len)) { + /* swap v0 doesn't support LABEL or UUID */ + blkid_probe_set_version(pr, "0"); + return 0; + + } + + if (!memcmp(mag->magic, "SWAPSPACE2", mag->len)) + return swap_set_info(pr, "1"); + + return 1; +} + +static int probe_swsuspend(blkid_probe pr, const struct blkid_idmag *mag) +{ + if (!mag) + return 1; + if (!memcmp(mag->magic, "S1SUSPEND", mag->len)) + return swap_set_info(pr, "s1suspend"); + if (!memcmp(mag->magic, "S2SUSPEND", mag->len)) + return swap_set_info(pr, "s2suspend"); + if (!memcmp(mag->magic, "ULSUSPEND", mag->len)) + return swap_set_info(pr, "ulsuspend"); + if (!memcmp(mag->magic, TOI_MAGIC_STRING, TOI_MAGIC_STRLEN)) + return swap_set_info(pr, "tuxonice"); + if (!memcmp(mag->magic, "LINHIB0001", mag->len)) + return swap_set_info(pr, "linhib0001"); + + return 1; /* no signature detected */ +} + +const struct blkid_idinfo swap_idinfo = +{ + .name = "swap", + .usage = BLKID_USAGE_OTHER, + .probefunc = probe_swap, + .minsz = 10 * 4096, /* 10 pages */ + .magics = + { + { .magic = "SWAP-SPACE", .len = 10, .sboff = 0xff6 }, + { .magic = "SWAPSPACE2", .len = 10, .sboff = 0xff6 }, + { .magic = "SWAP-SPACE", .len = 10, .sboff = 0x1ff6 }, + { .magic = "SWAPSPACE2", .len = 10, .sboff = 0x1ff6 }, + { .magic = "SWAP-SPACE", .len = 10, .sboff = 0x3ff6 }, + { .magic = "SWAPSPACE2", .len = 10, .sboff = 0x3ff6 }, + { .magic = "SWAP-SPACE", .len = 10, .sboff = 0x7ff6 }, + { .magic = "SWAPSPACE2", .len = 10, .sboff = 0x7ff6 }, + { .magic = "SWAP-SPACE", .len = 10, .sboff = 0xfff6 }, + { .magic = "SWAPSPACE2", .len = 10, .sboff = 0xfff6 }, + { NULL } + } +}; + + +const struct blkid_idinfo swsuspend_idinfo = +{ + .name = "swsuspend", + .usage = BLKID_USAGE_OTHER, + .probefunc = probe_swsuspend, + .minsz = 10 * 4096, /* 10 pages */ + .magics = + { + { .magic = TOI_MAGIC_STRING, .len = TOI_MAGIC_STRLEN }, + { .magic = "S1SUSPEND", .len = 9, .sboff = 0xff6 }, + { .magic = "S2SUSPEND", .len = 9, .sboff = 0xff6 }, + { .magic = "ULSUSPEND", .len = 9, .sboff = 0xff6 }, + { .magic = "LINHIB0001", .len = 10, .sboff = 0xff6 }, + + { .magic = "S1SUSPEND", .len = 9, .sboff = 0x1ff6 }, + { .magic = "S2SUSPEND", .len = 9, .sboff = 0x1ff6 }, + { .magic = "ULSUSPEND", .len = 9, .sboff = 0x1ff6 }, + { .magic = "LINHIB0001", .len = 10, .sboff = 0x1ff6 }, + + { .magic = "S1SUSPEND", .len = 9, .sboff = 0x3ff6 }, + { .magic = "S2SUSPEND", .len = 9, .sboff = 0x3ff6 }, + { .magic = "ULSUSPEND", .len = 9, .sboff = 0x3ff6 }, + { .magic = "LINHIB0001", .len = 10, .sboff = 0x3ff6 }, + + { .magic = "S1SUSPEND", .len = 9, .sboff = 0x7ff6 }, + { .magic = "S2SUSPEND", .len = 9, .sboff = 0x7ff6 }, + { .magic = "ULSUSPEND", .len = 9, .sboff = 0x7ff6 }, + { .magic = "LINHIB0001", .len = 10, .sboff = 0x7ff6 }, + + { .magic = "S1SUSPEND", .len = 9, .sboff = 0xfff6 }, + { .magic = "S2SUSPEND", .len = 9, .sboff = 0xfff6 }, + { .magic = "ULSUSPEND", .len = 9, .sboff = 0xfff6 }, + { .magic = "LINHIB0001", .len = 10, .sboff = 0xfff6 }, + { NULL } + } +}; |