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Fix possible bug with bitmap space allocation with v1.0 metadata 

When adding a device to an array, make sure we don't reserve
so much space for the bitmap that there isn't room for the data.
This commit is contained in:
Neil Brown 2008-04-29 17:13:53 +10:00
parent 5f98d3cbd9
commit 519561f73f
4 changed files with 15 additions and 13 deletions
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0
.gitignore vendored Normal file
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12
md.4
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@ -1,9 +1,9 @@
''' Copyright Neil Brown and others. .\" Copyright Neil Brown and others.
''' This program is free software; you can redistribute it and/or modify .\" This program is free software; you can redistribute it and/or modify
''' it under the terms of the GNU General Public License as published by .\" it under the terms of the GNU General Public License as published by
''' the Free Software Foundation; either version 2 of the License, or .\" the Free Software Foundation; either version 2 of the License, or
''' (at your option) any later version. .\" (at your option) any later version.
''' See file COPYING in distribution for details. .\" See file COPYING in distribution for details.
.TH MD 4 .TH MD 4
.SH NAME .SH NAME
md \- Multiple Device driver aka Linux Software RAID md \- Multiple Device driver aka Linux Software RAID

12
mdadm.conf.5
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@ -1,9 +1,9 @@
''' Copyright Neil Brown and others. .\" Copyright Neil Brown and others.
''' This program is free software; you can redistribute it and/or modify .\" This program is free software; you can redistribute it and/or modify
''' it under the terms of the GNU General Public License as published by .\" it under the terms of the GNU General Public License as published by
''' the Free Software Foundation; either version 2 of the License, or .\" the Free Software Foundation; either version 2 of the License, or
''' (at your option) any later version. .\" (at your option) any later version.
''' See file COPYING in distribution for details. .\" See file COPYING in distribution for details.
.TH MDADM.CONF 5 .TH MDADM.CONF 5
.SH NAME .SH NAME
mdadm.conf \- configuration for management of Software RAID with mdadm mdadm.conf \- configuration for management of Software RAID with mdadm

4
super1.c
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@ -905,7 +905,7 @@ static int write_init_super1(struct supertype *st,
* for a bitmap. * for a bitmap.
*/ */
array_size = __le64_to_cpu(sb->size); array_size = __le64_to_cpu(sb->size);
/* work out how much space we left of a bitmap */ /* work out how much space we left for a bitmap */
bm_space = choose_bm_space(array_size); bm_space = choose_bm_space(array_size);
switch(st->minor_version) { switch(st->minor_version) {
@ -915,6 +915,8 @@ static int write_init_super1(struct supertype *st,
sb_offset &= ~(4*2-1); sb_offset &= ~(4*2-1);
sb->super_offset = __cpu_to_le64(sb_offset); sb->super_offset = __cpu_to_le64(sb_offset);
sb->data_offset = __cpu_to_le64(0); sb->data_offset = __cpu_to_le64(0);
if (sb_offset - bm_space < array_size)
bm_space = sb_offset - array_size;
sb->data_size = __cpu_to_le64(sb_offset - bm_space); sb->data_size = __cpu_to_le64(sb_offset - bm_space);
break; break;
case 1: case 1: