diff options
| author | Xin LI <delphij@FreeBSD.org> | 2014-11-10 08:20:21 +0000 |
|---|---|---|
| committer | Xin LI <delphij@FreeBSD.org> | 2014-11-10 08:20:21 +0000 |
| commit | 8bcd603968ef19c64a0bfe69519a932cd4c2ee33 (patch) | |
| tree | fc0c345a3bfb9af0de85b1f0161f8541e1696530 /sys/cddl/boot | |
| parent | ea455de91dd46492cce8a23e7a3b4c804312afe6 (diff) | |
| parent | 0945ce02d2314be0ecc3766528cb9ef289bcd418 (diff) | |
Notes
Diffstat (limited to 'sys/cddl/boot')
| -rw-r--r-- | sys/cddl/boot/zfs/zfsimpl.h | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/sys/cddl/boot/zfs/zfsimpl.h b/sys/cddl/boot/zfs/zfsimpl.h index 5f2e255e77072..730cdf49a0dd1 100644 --- a/sys/cddl/boot/zfs/zfsimpl.h +++ b/sys/cddl/boot/zfs/zfsimpl.h @@ -113,17 +113,14 @@ #define BSWAP_64(x) ((BSWAP_32(x) << 32) | BSWAP_32((x) >> 32)) /* - * We currently support nine block sizes, from 512 bytes to 128K. - * We could go higher, but the benefits are near-zero and the cost - * of COWing a giant block to modify one byte would become excessive. + * Note: the boot loader can't actually read blocks larger than 128KB, + * due to lack of memory. Therefore its SPA_MAXBLOCKSIZE is still 128KB. */ #define SPA_MINBLOCKSHIFT 9 #define SPA_MAXBLOCKSHIFT 17 #define SPA_MINBLOCKSIZE (1ULL << SPA_MINBLOCKSHIFT) #define SPA_MAXBLOCKSIZE (1ULL << SPA_MAXBLOCKSHIFT) -#define SPA_BLOCKSIZES (SPA_MAXBLOCKSHIFT - SPA_MINBLOCKSHIFT + 1) - /* * The DVA size encodings for LSIZE and PSIZE support blocks up to 32MB. * The ASIZE encoding should be at least 64 times larger (6 more bits) |