From 30d358cd5a66ea85b06729df8fa13a068ac21d51 Mon Sep 17 00:00:00 2001 From: Tomas Mudrunka Date: Fri, 12 Jan 2024 17:41:23 +0100 Subject: [PATCH] Lepsi hodnoty --- c/mdraid-gen/mdraid.c | 23 +++++++++++++++-------- 1 file changed, 15 insertions(+), 8 deletions(-) diff --git a/c/mdraid-gen/mdraid.c b/c/mdraid-gen/mdraid.c index 7c946ca..8a60052 100644 --- a/c/mdraid-gen/mdraid.c +++ b/c/mdraid-gen/mdraid.c @@ -6,6 +6,9 @@ make mdraid ./mdraid > test.img mdadm --examine test.img +losetup /dev/loop1 test.img +mdadm --assemble md /dev/loop1 + */ //#include @@ -56,6 +59,8 @@ static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb) } int main() { + size_t data_size = 10000; //512B sectors + srand(time(NULL)); //FIXME: Seed UUID properly struct mdp_superblock_1 sb = {0}; @@ -68,23 +73,23 @@ int main() { //TODO: set these random_uuid(sb.set_uuid); /* user-space generated. U8[16]*/ - memcpy(sb.set_name, "localhost:777", 6); /* set and interpreted by user-space. CHAR[32] */ + memcpy(sb.set_name, "localhost:7", 12); /* set and interpreted by user-space. CHAR[32] */ sb.ctime=0; /* lo 40 bits are seconds, top 24 are microseconds or 0*/ sb.level=1; /* -4 (multipath), -1 (linear), 0,1,4,5 */ - sb.layout=2; /* only for raid5 and raid10 currently */ - sb.size; /* used size of component devices, in 512byte sectors */ + //sb.layout=2; /* only for raid5 and raid10 currently */ + sb.size=data_size+128; /* used size of component devices, in 512byte sectors */ sb.chunksize=0; /* in 512byte sectors - not used in raid 1 */ sb.raid_disks=1; - sb.bitmap_offset=0; /* sectors after start of superblock that bitmap starts + sb.bitmap_offset=8; /* sectors after start of superblock that bitmap starts * NOTE: signed, so bitmap can be before superblock * only meaningful of feature_map[0] is set. */ /* constant this-device information - 64 bytes */ - sb.data_offset=4096+sizeof(sb); /* sector start of data, often 0 */ - sb.data_size; /* sectors in this device that can be used for data */ + sb.data_offset=128; /* sector start of data, often 0 */ + sb.data_size=data_size; /* sectors in this device that can be used for data */ sb.super_offset=8; /* sector start of this superblock */ sb.dev_number=0; /* permanent identifier of this device - not role in raid */ @@ -113,7 +118,9 @@ int main() { sb.sb_csum=calc_sb_1_csum(&sb); //printf("Superblock\n"); - for(int i=0;i<4096;i++) putc(0, stdout); + for(int i=0;i<(8*512);i++) putc(0, stdout); fwrite(&sb, sizeof(sb), 1, stdout); - for(int i=0;i<40960;i++) putc(0, stdout); + for(int i=0;i<((120*512)-sizeof(sb));i++) putc(0, stdout); + + for(int i=0;i<(data_size*512);i++) putc(0, stdout); } -- 2.30.2