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Use a helper function to clarify gang block size

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For gang blocks, `DVA_GET_ASIZE()` is the total space allocated for the
gang DVA including its children BP's.  The space allocated at each DVA's
vdev/offset is `vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE)`.

This commit makes this relationship more clear by using a helper
function, `vdev_gang_header_asize()`, for the space allocated at the
gang block's vdev/offset.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Matthew Ahrens <mahrens@delphix.com>
Closes #11744
This commit is contained in:
Matthew Ahrens
2021-03-26 11:19:35 -07:00
committed by GitHub
parent b85f47efd0
commit 2b56a63457
4 changed files with 30 additions and 11 deletions
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include/sys/spa.h
+6
View File
@@ -405,6 +405,12 @@ typedef struct blkptr {
/*
* Macros to get and set fields in a bp or DVA.
*/
/*
* Note, for gang blocks, DVA_GET_ASIZE() is the total space allocated for
* this gang DVA including its children BP's. The space allocated at this
* DVA's vdev/offset is vdev_gang_header_asize(vdev).
*/
#define DVA_GET_ASIZE(dva) \
BF64_GET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, SPA_MINBLOCKSHIFT, 0)
#define DVA_SET_ASIZE(dva, x) \
include/sys/vdev.h
+9
View File
@@ -133,6 +133,15 @@ extern int64_t vdev_deflated_space(vdev_t *vd, int64_t space);
extern uint64_t vdev_psize_to_asize(vdev_t *vd, uint64_t psize);
/*
* Return the amount of space allocated for a gang block header.
*/
static inline uint64_t
vdev_gang_header_asize(vdev_t *vd)
{
return (vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE));
}
extern int vdev_fault(spa_t *spa, uint64_t guid, vdev_aux_t aux);
extern int vdev_degrade(spa_t *spa, uint64_t guid, vdev_aux_t aux);
extern int vdev_online(spa_t *spa, uint64_t guid, uint64_t flags,