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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-10-12 22:23:30 +0200 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-11-18 19:28:01 +0100 |
| commit | 5ea42986694a96542644f9cae8b122d3a00c508f (patch) | |
| tree | dd74685d8cd41e39ad14e708cb6e00e0ed016fb1 /drivers/block/xen-blkback/common.h | |
| parent | xen/blk[front|back]: Squash blkif_request_rw and blkif_request_discard together (diff) | |
| download | linux-5ea42986694a96542644f9cae8b122d3a00c508f.tar.xz linux-5ea42986694a96542644f9cae8b122d3a00c508f.zip | |
xen/blk[front|back]: Enhance discard support with secure erasing support.
Part of the blkdev_issue_discard(xx) operation is that it can also
issue a secure discard operation that will permanantly remove the
sectors in question. We advertise that we can support that via the
'discard-secure' attribute and on the request, if the 'secure' bit
is set, we will attempt to pass in REQ_DISCARD | REQ_SECURE.
CC: Li Dongyang <lidongyang@novell.com>
[v1: Used 'flag' instead of 'secure:1' bit]
[v2: Use 'reserved' uint8_t instead of adding a new value]
[v3: Check for nseg when mapping instead of operation]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/block/xen-blkback/common.h')
| -rw-r--r-- | drivers/block/xen-blkback/common.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h index dbfe7b3b0737..d0ee7edc9be8 100644 --- a/drivers/block/xen-blkback/common.h +++ b/drivers/block/xen-blkback/common.h @@ -69,7 +69,7 @@ struct blkif_x86_32_request_rw { } __attribute__((__packed__)); struct blkif_x86_32_request_discard { - uint8_t nr_segments; /* number of segments */ + uint8_t flag; /* BLKIF_DISCARD_SECURE or zero */ blkif_vdev_t _pad1; /* was "handle" for read/write requests */ uint64_t id; /* private guest value, echoed in resp */ blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ @@ -104,7 +104,7 @@ struct blkif_x86_64_request_rw { } __attribute__((__packed__)); struct blkif_x86_64_request_discard { - uint8_t nr_segments; /* number of segments */ + uint8_t flag; /* BLKIF_DISCARD_SECURE or zero */ blkif_vdev_t _pad1; /* was "handle" for read/write requests */ uint32_t _pad2; /* offsetof(blkif_..,u.discard.id)==8 */ uint64_t id; @@ -164,6 +164,7 @@ struct xen_vbd { /* Cached size parameter. */ sector_t size; bool flush_support; + bool discard_secure; }; struct backend_info; @@ -261,6 +262,7 @@ static inline void blkif_get_x86_32_req(struct blkif_request *dst, dst->u.rw.seg[i] = src->u.rw.seg[i]; break; case BLKIF_OP_DISCARD: + dst->u.discard.flag = src->u.discard.flag; dst->u.discard.sector_number = src->u.discard.sector_number; dst->u.discard.nr_sectors = src->u.discard.nr_sectors; break; @@ -290,6 +292,7 @@ static inline void blkif_get_x86_64_req(struct blkif_request *dst, dst->u.rw.seg[i] = src->u.rw.seg[i]; break; case BLKIF_OP_DISCARD: + dst->u.discard.flag = src->u.discard.flag; dst->u.discard.sector_number = src->u.discard.sector_number; dst->u.discard.nr_sectors = src->u.discard.nr_sectors; break; |