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| author | Will Andrews <will@FreeBSD.org> | 2013-03-23 16:55:07 +0000 |
|---|---|---|
| committer | Will Andrews <will@FreeBSD.org> | 2013-03-23 16:55:07 +0000 |
| commit | ef04b888d25cec4cb3edfcde3e7dc8ab8a1b76b8 (patch) | |
| tree | 51f9703ca2c4262279434974dafdb5e22831aa91 /sys/sys | |
| parent | 58567a1b4ea2125c75587cfc1ac7c39e4007d302 (diff) | |
| download | src-ef04b888d25cec4cb3edfcde3e7dc8ab8a1b76b8.tar.gz src-ef04b888d25cec4cb3edfcde3e7dc8ab8a1b76b8.zip | |
Be more explicit about what each bio_cmd & bio_flags value means.
Reviewed by: ken (mentor)
Notes
Notes:
svn path=/head/; revision=248654
Diffstat (limited to 'sys/sys')
| -rw-r--r-- | sys/sys/bio.h | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/sys/sys/bio.h b/sys/sys/bio.h index 7678f5aa4f13..535ce6136cc1 100644 --- a/sys/sys/bio.h +++ b/sys/sys/bio.h @@ -41,19 +41,23 @@ #include <sys/queue.h> /* bio_cmd */ -#define BIO_READ 0x01 -#define BIO_WRITE 0x02 -#define BIO_DELETE 0x04 -#define BIO_GETATTR 0x08 -#define BIO_FLUSH 0x10 +#define BIO_READ 0x01 /* Read I/O data */ +#define BIO_WRITE 0x02 /* Write I/O data */ +#define BIO_DELETE 0x04 /* TRIM or free blocks, i.e. mark as unused */ +#define BIO_GETATTR 0x08 /* Get GEOM attributes of object */ +#define BIO_FLUSH 0x10 /* Commit outstanding I/O now */ #define BIO_CMD0 0x20 /* Available for local hacks */ #define BIO_CMD1 0x40 /* Available for local hacks */ #define BIO_CMD2 0x80 /* Available for local hacks */ /* bio_flags */ -#define BIO_ERROR 0x01 -#define BIO_DONE 0x02 -#define BIO_ONQUEUE 0x04 +#define BIO_ERROR 0x01 /* An error occurred processing this bio. */ +#define BIO_DONE 0x02 /* This bio is finished. */ +#define BIO_ONQUEUE 0x04 /* This bio is in a queue & not yet taken. */ +/* + * This bio must be executed after all previous bios in the queue have been + * executed, and before any successive bios can be executed. + */ #define BIO_ORDERED 0x08 #define BIO_UNMAPPED 0x10 #define BIO_TRANSIENT_MAPPING 0x20 |