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homework: Align partitions to 1MiB

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Align partitions to 1MiB for consistency with regular partition tools
which use 1MiB alignment by default
This commit is contained in:
scarlet-storm
2026-02-17 18:23:35 +05:30
parent fc280b64e8
commit 118cccf97f
1 changed files with 5 additions and 5 deletions
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src/home/homework-luks.c
+5 -5
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@@ -66,16 +66,16 @@
#include "user-record.h"
#include "user-util.h"
/* Round down to the nearest 4K size. Given that newer hardware generally prefers 4K sectors, let's align our
* partitions to that too. In the worst case we'll waste 3.5K per partition that way, but I think I can live
/* Round down to the nearest 1 MiB size. Given that most tools generally align partitions to 1 MiB boundaries, let's align our
* partitions to that too. In the worst case we'll waste 1 MiB per partition that way, but I think I can live
* with that. */
#define DISK_SIZE_ROUND_DOWN(x) ((x) & ~UINT64_C(4095))
#define DISK_SIZE_ROUND_DOWN(x) ((x) & ~(U64_MB - 1))
/* Rounds up to the nearest 4K boundary. Returns UINT64_MAX on overflow */
/* Rounds up to the nearest 1 MiB boundary. Returns UINT64_MAX on overflow */
#define DISK_SIZE_ROUND_UP(x) \
({ \
uint64_t _x = (x); \
_x > UINT64_MAX - 4095U ? UINT64_MAX : (_x + 4095U) & ~UINT64_C(4095); \
_x > UINT64_MAX - (U64_MB - 1) ? UINT64_MAX : (DISK_SIZE_ROUND_DOWN(_x + U64_MB - 1)); \
})
/* How much larger will the image on disk be than the fs inside it, i.e. the space we pay for the GPT and