93 lines
2.8 KiB
Diff
93 lines
2.8 KiB
Diff
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From d9751e06a601b5576b1b9e2c8126584083110ca5 Mon Sep 17 00:00:00 2001
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From: NeilBrown <neilb@suse.de>
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Date: Tue, 15 May 2012 09:51:03 +1000
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Subject: [PATCH] super1: fix choice of data_offset.
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While it is nice to set a high data_offset to leave plenty of head
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room it is much more important to leave enough space to allow
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of the data of the array.
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So after we check that sb->size is still available, only reduce the
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'reserved', don't increase it.
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This fixes a bug where --adding a spare fails because it does not have
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enough space in it.
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Reported-by: nowhere <nowhere@hakkenden.ath.cx>
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Signed-off-by: NeilBrown <neilb@suse.de>
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---
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super1.c | 31 ++++++++++++++++---------------
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1 files changed, 16 insertions(+), 15 deletions(-)
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diff --git a/super1.c b/super1.c
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index be77c33..4f20cc3 100644
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--- a/super1.c
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+++ b/super1.c
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@@ -1189,40 +1189,42 @@ static int write_init_super1(struct supertype *st)
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case 1:
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sb->super_offset = __cpu_to_le64(0);
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reserved = bm_space + 4*2;
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+ if (reserved < headroom)
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+ reserved = headroom;
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+ if (reserved + array_size > dsize)
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+ reserved = dsize - array_size;
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/* Try for multiple of 1Meg so it is nicely aligned */
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#define ONE_MEG (2*1024)
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- reserved = ((reserved + ONE_MEG-1)/ONE_MEG) * ONE_MEG;
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- if (reserved + __le64_to_cpu(sb->size) > dsize)
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- reserved = dsize - __le64_to_cpu(sb->size);
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+ if (reserved > ONE_MEG)
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+ reserved = (reserved/ONE_MEG) * ONE_MEG;
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+
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/* force 4K alignment */
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reserved &= ~7ULL;
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- if (reserved < headroom)
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- reserved = headroom;
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-
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sb->data_offset = __cpu_to_le64(reserved);
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sb->data_size = __cpu_to_le64(dsize - reserved);
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break;
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case 2:
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sb_offset = 4*2;
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sb->super_offset = __cpu_to_le64(4*2);
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- if (4*2 + 4*2 + bm_space + __le64_to_cpu(sb->size)
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+ if (4*2 + 4*2 + bm_space + array_size
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> dsize)
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- bm_space = dsize - __le64_to_cpu(sb->size)
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+ bm_space = dsize - array_size
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- 4*2 - 4*2;
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reserved = bm_space + 4*2 + 4*2;
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+ if (reserved < headroom)
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+ reserved = headroom;
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+ if (reserved + array_size > dsize)
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+ reserved = dsize - array_size;
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/* Try for multiple of 1Meg so it is nicely aligned */
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#define ONE_MEG (2*1024)
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- reserved = ((reserved + ONE_MEG-1)/ONE_MEG) * ONE_MEG;
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- if (reserved + __le64_to_cpu(sb->size) > dsize)
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- reserved = dsize - __le64_to_cpu(sb->size);
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+ if (reserved > ONE_MEG)
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+ reserved = (reserved/ONE_MEG) * ONE_MEG;
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+
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/* force 4K alignment */
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reserved &= ~7ULL;
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- if (reserved < headroom)
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- reserved = headroom;
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-
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sb->data_offset = __cpu_to_le64(reserved);
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sb->data_size = __cpu_to_le64(dsize - reserved);
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break;
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@@ -1234,7 +1236,6 @@ static int write_init_super1(struct supertype *st)
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goto out;
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}
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-
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sb->sb_csum = calc_sb_1_csum(sb);
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rv = store_super1(st, di->fd);
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if (rv == 0 && (__le32_to_cpu(sb->feature_map) & 1))
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--
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1.7.7.6
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