mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-08 06:16:39 +07:00
814d04e7df
Currently xenwatch blocks in VBD disconnect, waiting for all pending I/O requests to finish. If the VBD is attached to a hot-swappable disk, then xenwatch can hang for a long period of time, stalling other watches. INFO: task xenwatch:39 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. ffff880057f01bd0 0000000000000246 ffff880057f01ac0 ffffffff810b0782 ffff880057f01ad0 00000000000131c0 0000000000000004 ffff880057edb040 ffff8800344c6080 0000000000000000 ffff880058c00ba0 ffff880057edb040 Call Trace: [<ffffffff810b0782>] ? irq_to_desc+0x12/0x20 [<ffffffff8128f761>] ? list_del+0x11/0x40 [<ffffffff8147a080>] ? wait_for_common+0x60/0x160 [<ffffffff8147bcef>] ? _raw_spin_lock_irqsave+0x2f/0x50 [<ffffffff8147bd49>] ? _raw_spin_unlock_irqrestore+0x19/0x20 [<ffffffff8147a26a>] schedule+0x3a/0x60 [<ffffffffa018fe6a>] xen_blkif_disconnect+0x8a/0x100 [xen_blkback] [<ffffffff81079f70>] ? wake_up_bit+0x40/0x40 [<ffffffffa018ffce>] xen_blkbk_remove+0xae/0x1e0 [xen_blkback] [<ffffffff8130b254>] xenbus_dev_remove+0x44/0x90 [<ffffffff81345cb7>] __device_release_driver+0x77/0xd0 [<ffffffff81346488>] device_release_driver+0x28/0x40 [<ffffffff813456e8>] bus_remove_device+0x78/0xe0 [<ffffffff81342c9f>] device_del+0x12f/0x1a0 [<ffffffff81342d2d>] device_unregister+0x1d/0x60 [<ffffffffa0190826>] frontend_changed+0xa6/0x4d0 [xen_blkback] [<ffffffffa019c252>] ? frontend_changed+0x192/0x650 [xen_netback] [<ffffffff8130ae50>] ? cmp_dev+0x60/0x60 [<ffffffff81344fe4>] ? bus_for_each_dev+0x94/0xa0 [<ffffffff8130b06e>] xenbus_otherend_changed+0xbe/0x120 [<ffffffff8130b4cb>] frontend_changed+0xb/0x10 [<ffffffff81309c82>] xenwatch_thread+0xf2/0x130 [<ffffffff81079f70>] ? wake_up_bit+0x40/0x40 [<ffffffff81309b90>] ? xenbus_directory+0x80/0x80 [<ffffffff810799d6>] kthread+0x96/0xa0 [<ffffffff81485934>] kernel_thread_helper+0x4/0x10 [<ffffffff814839f3>] ? int_ret_from_sys_call+0x7/0x1b [<ffffffff8147c17c>] ? retint_restore_args+0x5/0x6 [<ffffffff81485930>] ? gs_change+0x13/0x13 With this patch, when there is still pending I/O, the actual disconnect is done by the last reference holder (last pending I/O request). In this case, xenwatch doesn't block indefinitely. Signed-off-by: Valentin Priescu <priescuv@amazon.com> Reviewed-by: Steven Kady <stevkady@amazon.com> Reviewed-by: Steven Noonan <snoonan@amazon.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
487 lines
16 KiB
C
487 lines
16 KiB
C
/*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License version 2
|
|
* as published by the Free Software Foundation; or, when distributed
|
|
* separately from the Linux kernel or incorporated into other
|
|
* software packages, subject to the following license:
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this source file (the "Software"), to deal in the Software without
|
|
* restriction, including without limitation the rights to use, copy, modify,
|
|
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
|
|
* and to permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
|
* IN THE SOFTWARE.
|
|
*/
|
|
|
|
#ifndef __XEN_BLKIF__BACKEND__COMMON_H__
|
|
#define __XEN_BLKIF__BACKEND__COMMON_H__
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/io.h>
|
|
#include <linux/rbtree.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/hypervisor.h>
|
|
#include <xen/grant_table.h>
|
|
#include <xen/xenbus.h>
|
|
#include <xen/interface/io/ring.h>
|
|
#include <xen/interface/io/blkif.h>
|
|
#include <xen/interface/io/protocols.h>
|
|
|
|
#define DRV_PFX "xen-blkback:"
|
|
#define DPRINTK(fmt, args...) \
|
|
pr_debug(DRV_PFX "(%s:%d) " fmt ".\n", \
|
|
__func__, __LINE__, ##args)
|
|
|
|
|
|
/*
|
|
* This is the maximum number of segments that would be allowed in indirect
|
|
* requests. This value will also be passed to the frontend.
|
|
*/
|
|
#define MAX_INDIRECT_SEGMENTS 256
|
|
|
|
#define SEGS_PER_INDIRECT_FRAME \
|
|
(PAGE_SIZE/sizeof(struct blkif_request_segment))
|
|
#define MAX_INDIRECT_PAGES \
|
|
((MAX_INDIRECT_SEGMENTS + SEGS_PER_INDIRECT_FRAME - 1)/SEGS_PER_INDIRECT_FRAME)
|
|
#define INDIRECT_PAGES(_segs) \
|
|
((_segs + SEGS_PER_INDIRECT_FRAME - 1)/SEGS_PER_INDIRECT_FRAME)
|
|
|
|
/* Not a real protocol. Used to generate ring structs which contain
|
|
* the elements common to all protocols only. This way we get a
|
|
* compiler-checkable way to use common struct elements, so we can
|
|
* avoid using switch(protocol) in a number of places. */
|
|
struct blkif_common_request {
|
|
char dummy;
|
|
};
|
|
struct blkif_common_response {
|
|
char dummy;
|
|
};
|
|
|
|
struct blkif_x86_32_request_rw {
|
|
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];
|
|
} __attribute__((__packed__));
|
|
|
|
struct blkif_x86_32_request_discard {
|
|
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) */
|
|
uint64_t nr_sectors;
|
|
} __attribute__((__packed__));
|
|
|
|
struct blkif_x86_32_request_other {
|
|
uint8_t _pad1;
|
|
blkif_vdev_t _pad2;
|
|
uint64_t id; /* private guest value, echoed in resp */
|
|
} __attribute__((__packed__));
|
|
|
|
struct blkif_x86_32_request_indirect {
|
|
uint8_t indirect_op;
|
|
uint16_t nr_segments;
|
|
uint64_t id;
|
|
blkif_sector_t sector_number;
|
|
blkif_vdev_t handle;
|
|
uint16_t _pad1;
|
|
grant_ref_t indirect_grefs[BLKIF_MAX_INDIRECT_PAGES_PER_REQUEST];
|
|
/*
|
|
* The maximum number of indirect segments (and pages) that will
|
|
* be used is determined by MAX_INDIRECT_SEGMENTS, this value
|
|
* is also exported to the guest (via xenstore
|
|
* feature-max-indirect-segments entry), so the frontend knows how
|
|
* many indirect segments the backend supports.
|
|
*/
|
|
uint64_t _pad2; /* make it 64 byte aligned */
|
|
} __attribute__((__packed__));
|
|
|
|
struct blkif_x86_32_request {
|
|
uint8_t operation; /* BLKIF_OP_??? */
|
|
union {
|
|
struct blkif_x86_32_request_rw rw;
|
|
struct blkif_x86_32_request_discard discard;
|
|
struct blkif_x86_32_request_other other;
|
|
struct blkif_x86_32_request_indirect indirect;
|
|
} u;
|
|
} __attribute__((__packed__));
|
|
|
|
/* i386 protocol version */
|
|
#pragma pack(push, 4)
|
|
struct blkif_x86_32_response {
|
|
uint64_t id; /* copied from request */
|
|
uint8_t operation; /* copied from request */
|
|
int16_t status; /* BLKIF_RSP_??? */
|
|
};
|
|
#pragma pack(pop)
|
|
/* x86_64 protocol version */
|
|
|
|
struct blkif_x86_64_request_rw {
|
|
uint8_t nr_segments; /* number of segments */
|
|
blkif_vdev_t handle; /* only for read/write requests */
|
|
uint32_t _pad1; /* offsetof(blkif_reqest..,u.rw.id)==8 */
|
|
uint64_t id;
|
|
blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
|
|
struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
|
|
} __attribute__((__packed__));
|
|
|
|
struct blkif_x86_64_request_discard {
|
|
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;
|
|
blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
|
|
uint64_t nr_sectors;
|
|
} __attribute__((__packed__));
|
|
|
|
struct blkif_x86_64_request_other {
|
|
uint8_t _pad1;
|
|
blkif_vdev_t _pad2;
|
|
uint32_t _pad3; /* offsetof(blkif_..,u.discard.id)==8 */
|
|
uint64_t id; /* private guest value, echoed in resp */
|
|
} __attribute__((__packed__));
|
|
|
|
struct blkif_x86_64_request_indirect {
|
|
uint8_t indirect_op;
|
|
uint16_t nr_segments;
|
|
uint32_t _pad1; /* offsetof(blkif_..,u.indirect.id)==8 */
|
|
uint64_t id;
|
|
blkif_sector_t sector_number;
|
|
blkif_vdev_t handle;
|
|
uint16_t _pad2;
|
|
grant_ref_t indirect_grefs[BLKIF_MAX_INDIRECT_PAGES_PER_REQUEST];
|
|
/*
|
|
* The maximum number of indirect segments (and pages) that will
|
|
* be used is determined by MAX_INDIRECT_SEGMENTS, this value
|
|
* is also exported to the guest (via xenstore
|
|
* feature-max-indirect-segments entry), so the frontend knows how
|
|
* many indirect segments the backend supports.
|
|
*/
|
|
uint32_t _pad3; /* make it 64 byte aligned */
|
|
} __attribute__((__packed__));
|
|
|
|
struct blkif_x86_64_request {
|
|
uint8_t operation; /* BLKIF_OP_??? */
|
|
union {
|
|
struct blkif_x86_64_request_rw rw;
|
|
struct blkif_x86_64_request_discard discard;
|
|
struct blkif_x86_64_request_other other;
|
|
struct blkif_x86_64_request_indirect indirect;
|
|
} u;
|
|
} __attribute__((__packed__));
|
|
|
|
struct blkif_x86_64_response {
|
|
uint64_t __attribute__((__aligned__(8))) id;
|
|
uint8_t operation; /* copied from request */
|
|
int16_t status; /* BLKIF_RSP_??? */
|
|
};
|
|
|
|
DEFINE_RING_TYPES(blkif_common, struct blkif_common_request,
|
|
struct blkif_common_response);
|
|
DEFINE_RING_TYPES(blkif_x86_32, struct blkif_x86_32_request,
|
|
struct blkif_x86_32_response);
|
|
DEFINE_RING_TYPES(blkif_x86_64, struct blkif_x86_64_request,
|
|
struct blkif_x86_64_response);
|
|
|
|
union blkif_back_rings {
|
|
struct blkif_back_ring native;
|
|
struct blkif_common_back_ring common;
|
|
struct blkif_x86_32_back_ring x86_32;
|
|
struct blkif_x86_64_back_ring x86_64;
|
|
};
|
|
|
|
enum blkif_protocol {
|
|
BLKIF_PROTOCOL_NATIVE = 1,
|
|
BLKIF_PROTOCOL_X86_32 = 2,
|
|
BLKIF_PROTOCOL_X86_64 = 3,
|
|
};
|
|
|
|
struct xen_vbd {
|
|
/* What the domain refers to this vbd as. */
|
|
blkif_vdev_t handle;
|
|
/* Non-zero -> read-only */
|
|
unsigned char readonly;
|
|
/* VDISK_xxx */
|
|
unsigned char type;
|
|
/* phys device that this vbd maps to. */
|
|
u32 pdevice;
|
|
struct block_device *bdev;
|
|
/* Cached size parameter. */
|
|
sector_t size;
|
|
unsigned int flush_support:1;
|
|
unsigned int discard_secure:1;
|
|
unsigned int feature_gnt_persistent:1;
|
|
unsigned int overflow_max_grants:1;
|
|
};
|
|
|
|
struct backend_info;
|
|
|
|
/* Number of available flags */
|
|
#define PERSISTENT_GNT_FLAGS_SIZE 2
|
|
/* This persistent grant is currently in use */
|
|
#define PERSISTENT_GNT_ACTIVE 0
|
|
/*
|
|
* This persistent grant has been used, this flag is set when we remove the
|
|
* PERSISTENT_GNT_ACTIVE, to know that this grant has been used recently.
|
|
*/
|
|
#define PERSISTENT_GNT_WAS_ACTIVE 1
|
|
|
|
/* Number of requests that we can fit in a ring */
|
|
#define XEN_BLKIF_REQS 32
|
|
|
|
struct persistent_gnt {
|
|
struct page *page;
|
|
grant_ref_t gnt;
|
|
grant_handle_t handle;
|
|
DECLARE_BITMAP(flags, PERSISTENT_GNT_FLAGS_SIZE);
|
|
struct rb_node node;
|
|
struct list_head remove_node;
|
|
};
|
|
|
|
struct xen_blkif {
|
|
/* Unique identifier for this interface. */
|
|
domid_t domid;
|
|
unsigned int handle;
|
|
/* Physical parameters of the comms window. */
|
|
unsigned int irq;
|
|
/* Comms information. */
|
|
enum blkif_protocol blk_protocol;
|
|
union blkif_back_rings blk_rings;
|
|
void *blk_ring;
|
|
/* The VBD attached to this interface. */
|
|
struct xen_vbd vbd;
|
|
/* Back pointer to the backend_info. */
|
|
struct backend_info *be;
|
|
/* Private fields. */
|
|
spinlock_t blk_ring_lock;
|
|
atomic_t refcnt;
|
|
|
|
wait_queue_head_t wq;
|
|
/* for barrier (drain) requests */
|
|
struct completion drain_complete;
|
|
atomic_t drain;
|
|
atomic_t inflight;
|
|
/* One thread per one blkif. */
|
|
struct task_struct *xenblkd;
|
|
unsigned int waiting_reqs;
|
|
|
|
/* tree to store persistent grants */
|
|
struct rb_root persistent_gnts;
|
|
unsigned int persistent_gnt_c;
|
|
atomic_t persistent_gnt_in_use;
|
|
unsigned long next_lru;
|
|
|
|
/* used by the kworker that offload work from the persistent purge */
|
|
struct list_head persistent_purge_list;
|
|
struct work_struct persistent_purge_work;
|
|
|
|
/* buffer of free pages to map grant refs */
|
|
spinlock_t free_pages_lock;
|
|
int free_pages_num;
|
|
struct list_head free_pages;
|
|
|
|
/* List of all 'pending_req' available */
|
|
struct list_head pending_free;
|
|
/* And its spinlock. */
|
|
spinlock_t pending_free_lock;
|
|
wait_queue_head_t pending_free_wq;
|
|
|
|
/* statistics */
|
|
unsigned long st_print;
|
|
unsigned long long st_rd_req;
|
|
unsigned long long st_wr_req;
|
|
unsigned long long st_oo_req;
|
|
unsigned long long st_f_req;
|
|
unsigned long long st_ds_req;
|
|
unsigned long long st_rd_sect;
|
|
unsigned long long st_wr_sect;
|
|
|
|
struct work_struct free_work;
|
|
/* Thread shutdown wait queue. */
|
|
wait_queue_head_t shutdown_wq;
|
|
};
|
|
|
|
struct seg_buf {
|
|
unsigned long offset;
|
|
unsigned int nsec;
|
|
};
|
|
|
|
struct grant_page {
|
|
struct page *page;
|
|
struct persistent_gnt *persistent_gnt;
|
|
grant_handle_t handle;
|
|
grant_ref_t gref;
|
|
};
|
|
|
|
/*
|
|
* Each outstanding request that we've passed to the lower device layers has a
|
|
* 'pending_req' allocated to it. Each buffer_head that completes decrements
|
|
* the pendcnt towards zero. When it hits zero, the specified domain has a
|
|
* response queued for it, with the saved 'id' passed back.
|
|
*/
|
|
struct pending_req {
|
|
struct xen_blkif *blkif;
|
|
u64 id;
|
|
int nr_pages;
|
|
atomic_t pendcnt;
|
|
unsigned short operation;
|
|
int status;
|
|
struct list_head free_list;
|
|
struct grant_page *segments[MAX_INDIRECT_SEGMENTS];
|
|
/* Indirect descriptors */
|
|
struct grant_page *indirect_pages[MAX_INDIRECT_PAGES];
|
|
struct seg_buf seg[MAX_INDIRECT_SEGMENTS];
|
|
struct bio *biolist[MAX_INDIRECT_SEGMENTS];
|
|
};
|
|
|
|
|
|
#define vbd_sz(_v) ((_v)->bdev->bd_part ? \
|
|
(_v)->bdev->bd_part->nr_sects : \
|
|
get_capacity((_v)->bdev->bd_disk))
|
|
|
|
#define xen_blkif_get(_b) (atomic_inc(&(_b)->refcnt))
|
|
#define xen_blkif_put(_b) \
|
|
do { \
|
|
if (atomic_dec_and_test(&(_b)->refcnt)) \
|
|
schedule_work(&(_b)->free_work);\
|
|
} while (0)
|
|
|
|
struct phys_req {
|
|
unsigned short dev;
|
|
blkif_sector_t nr_sects;
|
|
struct block_device *bdev;
|
|
blkif_sector_t sector_number;
|
|
};
|
|
int xen_blkif_interface_init(void);
|
|
|
|
int xen_blkif_xenbus_init(void);
|
|
|
|
irqreturn_t xen_blkif_be_int(int irq, void *dev_id);
|
|
int xen_blkif_schedule(void *arg);
|
|
int xen_blkif_purge_persistent(void *arg);
|
|
void xen_blkbk_free_caches(struct xen_blkif *blkif);
|
|
|
|
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);
|
|
void xen_blkbk_unmap_purged_grants(struct work_struct *work);
|
|
|
|
static inline void blkif_get_x86_32_req(struct blkif_request *dst,
|
|
struct blkif_x86_32_request *src)
|
|
{
|
|
int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST, j;
|
|
dst->operation = src->operation;
|
|
switch (src->operation) {
|
|
case BLKIF_OP_READ:
|
|
case BLKIF_OP_WRITE:
|
|
case BLKIF_OP_WRITE_BARRIER:
|
|
case BLKIF_OP_FLUSH_DISKCACHE:
|
|
dst->u.rw.nr_segments = src->u.rw.nr_segments;
|
|
dst->u.rw.handle = src->u.rw.handle;
|
|
dst->u.rw.id = src->u.rw.id;
|
|
dst->u.rw.sector_number = src->u.rw.sector_number;
|
|
barrier();
|
|
if (n > dst->u.rw.nr_segments)
|
|
n = dst->u.rw.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.flag = src->u.discard.flag;
|
|
dst->u.discard.id = src->u.discard.id;
|
|
dst->u.discard.sector_number = src->u.discard.sector_number;
|
|
dst->u.discard.nr_sectors = src->u.discard.nr_sectors;
|
|
break;
|
|
case BLKIF_OP_INDIRECT:
|
|
dst->u.indirect.indirect_op = src->u.indirect.indirect_op;
|
|
dst->u.indirect.nr_segments = src->u.indirect.nr_segments;
|
|
dst->u.indirect.handle = src->u.indirect.handle;
|
|
dst->u.indirect.id = src->u.indirect.id;
|
|
dst->u.indirect.sector_number = src->u.indirect.sector_number;
|
|
barrier();
|
|
j = min(MAX_INDIRECT_PAGES, INDIRECT_PAGES(dst->u.indirect.nr_segments));
|
|
for (i = 0; i < j; i++)
|
|
dst->u.indirect.indirect_grefs[i] =
|
|
src->u.indirect.indirect_grefs[i];
|
|
break;
|
|
default:
|
|
/*
|
|
* Don't know how to translate this op. Only get the
|
|
* ID so failure can be reported to the frontend.
|
|
*/
|
|
dst->u.other.id = src->u.other.id;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static inline void blkif_get_x86_64_req(struct blkif_request *dst,
|
|
struct blkif_x86_64_request *src)
|
|
{
|
|
int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST, j;
|
|
dst->operation = src->operation;
|
|
switch (src->operation) {
|
|
case BLKIF_OP_READ:
|
|
case BLKIF_OP_WRITE:
|
|
case BLKIF_OP_WRITE_BARRIER:
|
|
case BLKIF_OP_FLUSH_DISKCACHE:
|
|
dst->u.rw.nr_segments = src->u.rw.nr_segments;
|
|
dst->u.rw.handle = src->u.rw.handle;
|
|
dst->u.rw.id = src->u.rw.id;
|
|
dst->u.rw.sector_number = src->u.rw.sector_number;
|
|
barrier();
|
|
if (n > dst->u.rw.nr_segments)
|
|
n = dst->u.rw.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.flag = src->u.discard.flag;
|
|
dst->u.discard.id = src->u.discard.id;
|
|
dst->u.discard.sector_number = src->u.discard.sector_number;
|
|
dst->u.discard.nr_sectors = src->u.discard.nr_sectors;
|
|
break;
|
|
case BLKIF_OP_INDIRECT:
|
|
dst->u.indirect.indirect_op = src->u.indirect.indirect_op;
|
|
dst->u.indirect.nr_segments = src->u.indirect.nr_segments;
|
|
dst->u.indirect.handle = src->u.indirect.handle;
|
|
dst->u.indirect.id = src->u.indirect.id;
|
|
dst->u.indirect.sector_number = src->u.indirect.sector_number;
|
|
barrier();
|
|
j = min(MAX_INDIRECT_PAGES, INDIRECT_PAGES(dst->u.indirect.nr_segments));
|
|
for (i = 0; i < j; i++)
|
|
dst->u.indirect.indirect_grefs[i] =
|
|
src->u.indirect.indirect_grefs[i];
|
|
break;
|
|
default:
|
|
/*
|
|
* Don't know how to translate this op. Only get the
|
|
* ID so failure can be reported to the frontend.
|
|
*/
|
|
dst->u.other.id = src->u.other.id;
|
|
break;
|
|
}
|
|
}
|
|
|
|
#endif /* __XEN_BLKIF__BACKEND__COMMON_H__ */
|