X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fblock%2Fxen-blkback%2Fcommon.h;h=dfb1b3a43a5ddc2edbe9310a1ab43af40a71c117;hb=626e3677a2cb59f8afb9caef3f58c4685587986a;hp=c4bd34063ecc8f01303932d4ec35d239e2f0d4a0;hpb=91e67a996c60a347ad7b918a74efb0f6b3b274c3;p=pandora-kernel.git diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h index c4bd34063ecc..dfb1b3a43a5d 100644 --- a/drivers/block/xen-blkback/common.h +++ b/drivers/block/xen-blkback/common.h @@ -62,13 +62,26 @@ struct blkif_common_response { /* i386 protocol version */ #pragma pack(push, 4) + +struct blkif_x86_32_request_rw { + blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ + struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST]; +}; + +struct blkif_x86_32_request_discard { + blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ + uint64_t nr_sectors; +}; + struct blkif_x86_32_request { uint8_t operation; /* BLKIF_OP_??? */ uint8_t nr_segments; /* number of segments */ blkif_vdev_t handle; /* only 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) */ - struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST]; + union { + struct blkif_x86_32_request_rw rw; + struct blkif_x86_32_request_discard discard; + } u; }; struct blkif_x86_32_response { uint64_t id; /* copied from request */ @@ -78,13 +91,26 @@ struct blkif_x86_32_response { #pragma pack(pop) /* x86_64 protocol version */ + +struct blkif_x86_64_request_rw { + blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ + struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST]; +}; + +struct blkif_x86_64_request_discard { + blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ + uint64_t nr_sectors; +}; + struct blkif_x86_64_request { uint8_t operation; /* BLKIF_OP_??? */ uint8_t nr_segments; /* number of segments */ blkif_vdev_t handle; /* only for read/write requests */ uint64_t __attribute__((__aligned__(8))) id; - blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ - struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST]; + union { + struct blkif_x86_64_request_rw rw; + struct blkif_x86_64_request_discard discard; + } u; }; struct blkif_x86_64_response { uint64_t __attribute__((__aligned__(8))) id; @@ -112,6 +138,11 @@ enum blkif_protocol { BLKIF_PROTOCOL_X86_64 = 3, }; +enum blkif_backend_type { + BLKIF_BACKEND_PHY = 1, + BLKIF_BACKEND_FILE = 2, +}; + struct xen_vbd { /* What the domain refers to this vbd as. */ blkif_vdev_t handle; @@ -137,8 +168,9 @@ struct xen_blkif { unsigned int irq; /* Comms information. */ enum blkif_protocol blk_protocol; + enum blkif_backend_type blk_backend_type; union blkif_back_rings blk_rings; - struct vm_struct *blk_ring_area; + void *blk_ring; /* The VBD attached to this interface. */ struct xen_vbd vbd; /* Back pointer to the backend_info. */ @@ -148,6 +180,9 @@ struct xen_blkif { atomic_t refcnt; wait_queue_head_t wq; + /* for barrier (drain) requests */ + struct completion drain_complete; + atomic_t drain; /* One thread per one blkif. */ struct task_struct *xenblkd; unsigned int waiting_reqs; @@ -158,13 +193,11 @@ struct xen_blkif { int st_wr_req; int st_oo_req; int st_f_req; + int st_ds_req; int st_rd_sect; int st_wr_sect; wait_queue_head_t waiting_to_free; - - grant_handle_t shmem_handle; - grant_ref_t shmem_ref; }; @@ -181,7 +214,7 @@ struct xen_blkif { struct phys_req { unsigned short dev; - unsigned short nr_sects; + blkif_sector_t nr_sects; struct block_device *bdev; blkif_sector_t sector_number; }; @@ -195,6 +228,8 @@ int xen_blkif_schedule(void *arg); int xen_blkbk_flush_diskcache(struct xenbus_transaction xbt, struct backend_info *be, int state); +int xen_blkbk_barrier(struct xenbus_transaction xbt, + struct backend_info *be, int state); struct xenbus_device *xen_blkbk_xenbus(struct backend_info *be); static inline void blkif_get_x86_32_req(struct blkif_request *dst, @@ -205,12 +240,25 @@ static inline void blkif_get_x86_32_req(struct blkif_request *dst, dst->nr_segments = src->nr_segments; dst->handle = src->handle; dst->id = src->id; - dst->u.rw.sector_number = src->sector_number; - barrier(); - if (n > dst->nr_segments) - n = dst->nr_segments; - for (i = 0; i < n; i++) - dst->u.rw.seg[i] = src->seg[i]; + switch (src->operation) { + case BLKIF_OP_READ: + case BLKIF_OP_WRITE: + case BLKIF_OP_WRITE_BARRIER: + case BLKIF_OP_FLUSH_DISKCACHE: + dst->u.rw.sector_number = src->u.rw.sector_number; + barrier(); + if (n > dst->nr_segments) + n = dst->nr_segments; + for (i = 0; i < n; i++) + dst->u.rw.seg[i] = src->u.rw.seg[i]; + break; + case BLKIF_OP_DISCARD: + dst->u.discard.sector_number = src->u.discard.sector_number; + dst->u.discard.nr_sectors = src->u.discard.nr_sectors; + break; + default: + break; + } } static inline void blkif_get_x86_64_req(struct blkif_request *dst, @@ -221,12 +269,25 @@ static inline void blkif_get_x86_64_req(struct blkif_request *dst, dst->nr_segments = src->nr_segments; dst->handle = src->handle; dst->id = src->id; - dst->u.rw.sector_number = src->sector_number; - barrier(); - if (n > dst->nr_segments) - n = dst->nr_segments; - for (i = 0; i < n; i++) - dst->u.rw.seg[i] = src->seg[i]; + switch (src->operation) { + case BLKIF_OP_READ: + case BLKIF_OP_WRITE: + case BLKIF_OP_WRITE_BARRIER: + case BLKIF_OP_FLUSH_DISKCACHE: + dst->u.rw.sector_number = src->u.rw.sector_number; + barrier(); + if (n > dst->nr_segments) + n = dst->nr_segments; + for (i = 0; i < n; i++) + dst->u.rw.seg[i] = src->u.rw.seg[i]; + break; + case BLKIF_OP_DISCARD: + dst->u.discard.sector_number = src->u.discard.sector_number; + dst->u.discard.nr_sectors = src->u.discard.nr_sectors; + break; + default: + break; + } } #endif /* __XEN_BLKIF__BACKEND__COMMON_H__ */