diff options
Diffstat (limited to 'libs/blkid/src/probers/swap.c')
| -rw-r--r-- | libs/blkid/src/probers/swap.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/libs/blkid/src/probers/swap.c b/libs/blkid/src/probers/swap.c new file mode 100644 index 000000000..6a887a8b2 --- /dev/null +++ b/libs/blkid/src/probers/swap.c @@ -0,0 +1,150 @@ +/* + * Copyright (C) 2008 Karel Zak <kzak@redhat.com> + * + * This is a derivative work from libvolume_id (udev) and libblkid (e2fsprogs). + * + * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> + * Copyright (C) 1999 by Andries Brouwer + * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o + * Copyright (C) 2001 by Andreas Dilger + * + */ +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <errno.h> +#include <ctype.h> +#include <stdint.h> + +#include "blkidP.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]; +}; + +#define PAGESIZE_MIN 0xff6 /* 4086 (arm, i386, ...) */ +#define PAGESIZE_MAX 0xfff6 /* 65526 (ia64) */ + + +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 -1; + + /* SWAPSPACE2 - check for wrong version or zeroed pagecount */ + if (strcmp(version, "2") == 0 && + (hdr->version != 1 || hdr->lastpage == 0)) + 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 (hdr->uuid[0] && 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) +{ + if (!mag) + return -1; + + if (!memcmp(mag->magic, "SWAP-SPACE", mag->len)) { + /* swap v0 doesn't support LABEL or UUID */ + blkid_probe_set_version(pr, "1"); + return 0; + + } else if (!memcmp(mag->magic, "SWAPSPACE2", mag->len)) + return swap_set_info(pr, "2"); + + 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, "\xed\xc3\x02\xe9\x98\x56\xe5\x0c", mag->len)) + return swap_set_info(pr, "tuxonice"); + + return -1; /* no signature detected */ +} + +const struct blkid_idinfo swap_idinfo = +{ + .name = "swap", + .usage = BLKID_USAGE_OTHER, + .probefunc = probe_swap, + .magics = + { + { "SWAP-SPACE", 10, 0, 0xff6 }, + { "SWAPSPACE2", 10, 0, 0xff6 }, + { "SWAP-SPACE", 10, 0, 0x1ff6 }, + { "SWAPSPACE2", 10, 0, 0x1ff6 }, + { "SWAP-SPACE", 10, 0, 0x3ff6 }, + { "SWAPSPACE2", 10, 0, 0x3ff6 }, + { "SWAP-SPACE", 10, 0, 0x7ff6 }, + { "SWAPSPACE2", 10, 0, 0x7ff6 }, + { "SWAP-SPACE", 10, 0, 0xfff6 }, + { "SWAPSPACE2", 10, 0, 0xfff6 }, + { NULL } + } +}; + + +const struct blkid_idinfo swsuspend_idinfo = +{ + .name = "swsupend", + .usage = BLKID_USAGE_OTHER, + .probefunc = probe_swsuspend, + .magics = + { + { "S1SUSPEND", 9, 0, 0xff6 }, + { "S2SUSPEND", 9, 0, 0xff6 }, + { "ULSUSPEND", 9, 0, 0xff6 }, + { "\xed\xc3\x02\xe9\x98\x56\xe5\x0c", 8, 0, 0xff6 }, + { "S1SUSPEND", 9, 0, 0x1ff6 }, + { "S2SUSPEND", 9, 0, 0x1ff6 }, + { "ULSUSPEND", 9, 0, 0x1ff6 }, + { "\xed\xc3\x02\xe9\x98\x56\xe5\x0c", 8, 0, 0x1ff6 }, + { "S1SUSPEND", 9, 0, 0x3ff6 }, + { "S2SUSPEND", 9, 0, 0x3ff6 }, + { "ULSUSPEND", 9, 0, 0x3ff6 }, + { "\xed\xc3\x02\xe9\x98\x56\xe5\x0c", 8, 0, 0x3ff6 }, + { "S1SUSPEND", 9, 0, 0x7ff6 }, + { "S2SUSPEND", 9, 0, 0x7ff6 }, + { "ULSUSPEND", 9, 0, 0x7ff6 }, + { "\xed\xc3\x02\xe9\x98\x56\xe5\x0c", 8, 0, 0x7ff6 }, + { "S1SUSPEND", 9, 0, 0xfff6 }, + { "S2SUSPEND", 9, 0, 0xfff6 }, + { "ULSUSPEND", 9, 0, 0xfff6 }, + { "\xed\xc3\x02\xe9\x98\x56\xe5\x0c", 8, 0, 0xfff6 }, + { NULL } + } +}; + |