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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.
''' 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
''' the Free Software Foundation; either version 2 of the License, or
''' (at your option) any later version.
''' See file COPYING in distribution for details.
.\" Copyright Neil Brown and others.
.\" 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
.\" the Free Software Foundation; either version 2 of the License, or
.\" (at your option) any later version.
.\" See file COPYING in distribution for details.
.TH MD 4
.SH NAME
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.
''' 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
''' the Free Software Foundation; either version 2 of the License, or
''' (at your option) any later version.
''' See file COPYING in distribution for details.
.\" Copyright Neil Brown and others.
.\" 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
.\" the Free Software Foundation; either version 2 of the License, or
.\" (at your option) any later version.
.\" See file COPYING in distribution for details.
.TH MDADM.CONF 5
.SH NAME
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.
*/
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);
switch(st->minor_version) {
@ -915,6 +915,8 @@ static int write_init_super1(struct supertype *st,
sb_offset &= ~(4*2-1);
sb->super_offset = __cpu_to_le64(sb_offset);
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);
break;
case 1: