diff options
Diffstat (limited to 'include/sys/sa_impl.h')
| -rw-r--r-- | include/sys/sa_impl.h | 37 |
1 files changed, 18 insertions, 19 deletions
diff --git a/include/sys/sa_impl.h b/include/sys/sa_impl.h index 8ae05ce36..582bd76f0 100644 --- a/include/sys/sa_impl.h +++ b/include/sys/sa_impl.h @@ -150,6 +150,7 @@ struct sa_os { /* * header for all bonus and spill buffers. + * * The header has a fixed portion with a variable number * of "lengths" depending on the number of variable sized * attribues which are determined by the "layout number" @@ -158,29 +159,27 @@ struct sa_os { #define SA_MAGIC 0x2F505A /* ZFS SA */ typedef struct sa_hdr_phys { uint32_t sa_magic; - uint16_t sa_layout_info; /* Encoded with hdrsize and layout number */ + /* + * Encoded with hdrsize and layout number as follows: + * 16 10 0 + * +--------+-------+ + * | hdrsz |layout | + * +--------+-------+ + * + * Bits 0-10 are the layout number + * Bits 11-16 are the size of the header. + * The hdrsize is the number * 8 + * + * For example. + * hdrsz of 1 ==> 8 byte header + * 2 ==> 16 byte header + * + */ + uint16_t sa_layout_info; uint16_t sa_lengths[1]; /* optional sizes for variable length attrs */ /* ... Data follows the lengths. */ } sa_hdr_phys_t; -/* - * sa_hdr_phys -> sa_layout_info - * - * 16 10 0 - * +--------+-------+ - * | hdrsz |layout | - * +--------+-------+ - * - * Bits 0-10 are the layout number - * Bits 11-16 are the size of the header. - * The hdrsize is the number * 8 - * - * For example. - * hdrsz of 1 ==> 8 byte header - * 2 ==> 16 byte header - * - */ - #define SA_HDR_LAYOUT_NUM(hdr) BF32_GET(hdr->sa_layout_info, 0, 10) #define SA_HDR_SIZE(hdr) BF32_GET_SB(hdr->sa_layout_info, 10, 6, 3, 0) #define SA_HDR_LAYOUT_INFO_ENCODE(x, num, size) \ |