41 lines
1.2 KiB
Diff
41 lines
1.2 KiB
Diff
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From: NeilBrown <neilb@suse.de>
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Some devices (dasd!) have 4K sectors, so metadata must be
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aligned on 4K boundaries.
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superblock already is, but bitmap might not be. So force the
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bitmap to a 4K boundary for v1.x metadata
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It already is for v1.1 and v1.2, so just fix for v1.0
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(Note that v0.90 already uses a 4K boundary too).
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Signed-off-by: NeilBrown <neilb@suse.de>
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diff --git a/super1.c b/super1.c
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index fee22a9..66e9771 100644
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--- a/super1.c
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+++ b/super1.c
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@@ -1437,11 +1437,6 @@ add_internal_bitmap1(struct supertype *st,
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*/
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offset = 0;
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room = choose_bm_space(__le64_to_cpu(sb->size));
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- if (room == 4*2) {
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- /* make it 3K after the superblock */
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- room = 3*2;
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- offset = 2;
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- }
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} else {
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room = __le64_to_cpu(sb->super_offset)
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- __le64_to_cpu(sb->data_offset)
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@@ -1498,8 +1493,9 @@ add_internal_bitmap1(struct supertype *st,
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if (offset == 0) {
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bits = (size*512) / chunk + 1;
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- room = ((bits+7)/8 + sizeof(bitmap_super_t) +511)/512;
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- offset = -room;
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+ /* Align bitmap space to a 4K boundary as some devices need that */
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+ room = ((bits+7)/8 + sizeof(bitmap_super_t) +4095)/4096;
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+ offset = -room * 8; /* *8 to convert 4K blocks to sectors */
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}
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sb->bitmap_offset = __cpu_to_le32(offset);
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