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xen_disk: be consistent with use of xendev and blkdev->xendev

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Certain functions in xen_disk are called with a pointer to xendev
(struct XenDevice *). They then use container_of() to acces the surrounding
blkdev (struct XenBlkDev) but then in various places use &blkdev->xendev
when use of the original xendev pointer is shorter to express and clearly
equivalent.

This patch is a purely cosmetic patch which makes sure there is a xendev
pointer on stack for any function where the pointer is need on multiple
occasions modified those functions to use it consistently.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
This commit is contained in:
Paul Durrant 2018-05-17 16:35:58 +01:00 committed by Stefano Stabellini
parent 5ebf962652
commit 443c3c9cf1
1 changed files with 46 additions and 44 deletions
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90
hw/block/xen_disk.c
View file

@ -178,10 +178,11 @@ static void ioreq_release(struct ioreq *ioreq, bool finish)
static int ioreq_parse(struct ioreq *ioreq)
{
struct XenBlkDev *blkdev = ioreq->blkdev;
struct XenDevice *xendev = &blkdev->xendev;
size_t len;
int i;
xen_pv_printf(&blkdev->xendev, 3,
xen_pv_printf(xendev, 3,
"op %d, nr %d, handle %d, id %" PRId64 ", sector %" PRId64 "\n",
ioreq->req.operation, ioreq->req.nr_segments,
ioreq->req.handle, ioreq->req.id, ioreq->req.sector_number);
@ -199,28 +200,28 @@ static int ioreq_parse(struct ioreq *ioreq)
case BLKIF_OP_DISCARD:
return 0;
default:
xen_pv_printf(&blkdev->xendev, 0, "error: unknown operation (%d)\n",
xen_pv_printf(xendev, 0, "error: unknown operation (%d)\n",
ioreq->req.operation);
goto err;
};
if (ioreq->req.operation != BLKIF_OP_READ && blkdev->mode[0] != 'w') {
xen_pv_printf(&blkdev->xendev, 0, "error: write req for ro device\n");
xen_pv_printf(xendev, 0, "error: write req for ro device\n");
goto err;
}
ioreq->start = ioreq->req.sector_number * blkdev->file_blk;
for (i = 0; i < ioreq->req.nr_segments; i++) {
if (i == BLKIF_MAX_SEGMENTS_PER_REQUEST) {
xen_pv_printf(&blkdev->xendev, 0, "error: nr_segments too big\n");
xen_pv_printf(xendev, 0, "error: nr_segments too big\n");
goto err;
}
if (ioreq->req.seg[i].first_sect > ioreq->req.seg[i].last_sect) {
xen_pv_printf(&blkdev->xendev, 0, "error: first > last sector\n");
xen_pv_printf(xendev, 0, "error: first > last sector\n");
goto err;
}
if (ioreq->req.seg[i].last_sect * BLOCK_SIZE >= XC_PAGE_SIZE) {
xen_pv_printf(&blkdev->xendev, 0, "error: page crossing\n");
xen_pv_printf(xendev, 0, "error: page crossing\n");
goto err;
}
@ -228,7 +229,7 @@ static int ioreq_parse(struct ioreq *ioreq)
ioreq->size += len;
}
if (ioreq->start + ioreq->size > blkdev->file_size) {
xen_pv_printf(&blkdev->xendev, 0, "error: access beyond end of file\n");
xen_pv_printf(xendev, 0, "error: access beyond end of file\n");
goto err;
}
return 0;
@ -244,7 +245,7 @@ static int ioreq_grant_copy(struct ioreq *ioreq)
struct XenDevice *xendev = &blkdev->xendev;
XenGrantCopySegment segs[BLKIF_MAX_SEGMENTS_PER_REQUEST];
int i, count, rc;
int64_t file_blk = ioreq->blkdev->file_blk;
int64_t file_blk = blkdev->file_blk;
bool to_domain = (ioreq->req.operation == BLKIF_OP_READ);
void *virt = ioreq->buf;
@ -272,7 +273,7 @@ static int ioreq_grant_copy(struct ioreq *ioreq)
rc = xen_be_copy_grant_refs(xendev, to_domain, segs, count);
if (rc) {
xen_pv_printf(&ioreq->blkdev->xendev, 0,
xen_pv_printf(xendev, 0,
"failed to copy data %d\n", rc);
ioreq->aio_errors++;
return -1;
@ -287,11 +288,12 @@ static void qemu_aio_complete(void *opaque, int ret)
{
struct ioreq *ioreq = opaque;
struct XenBlkDev *blkdev = ioreq->blkdev;
struct XenDevice *xendev = &blkdev->xendev;
aio_context_acquire(blkdev->ctx);
if (ret != 0) {
xen_pv_printf(&blkdev->xendev, 0, "%s I/O error\n",
xen_pv_printf(xendev, 0, "%s I/O error\n",
ioreq->req.operation == BLKIF_OP_READ ? "read" : "write");
ioreq->aio_errors++;
}
@ -625,16 +627,17 @@ static void blk_alloc(struct XenDevice *xendev)
static void blk_parse_discard(struct XenBlkDev *blkdev)
{
struct XenDevice *xendev = &blkdev->xendev;
int enable;
blkdev->feature_discard = true;
if (xenstore_read_be_int(&blkdev->xendev, "discard-enable", &enable) == 0) {
if (xenstore_read_be_int(xendev, "discard-enable", &enable) == 0) {
blkdev->feature_discard = !!enable;
}
if (blkdev->feature_discard) {
xenstore_write_be_int(&blkdev->xendev, "feature-discard", 1);
xenstore_write_be_int(xendev, "feature-discard", 1);
}
}
@ -649,7 +652,7 @@ static int blk_init(struct XenDevice *xendev)
/* read xenstore entries */
if (blkdev->params == NULL) {
char *h = NULL;
blkdev->params = xenstore_read_be_str(&blkdev->xendev, "params");
blkdev->params = xenstore_read_be_str(xendev, "params");
if (blkdev->params != NULL) {
h = strchr(blkdev->params, ':');
}
@ -669,18 +672,18 @@ static int blk_init(struct XenDevice *xendev)
blkdev->fileproto = "vpc";
}
if (blkdev->mode == NULL) {
blkdev->mode = xenstore_read_be_str(&blkdev->xendev, "mode");
blkdev->mode = xenstore_read_be_str(xendev, "mode");
}
if (blkdev->type == NULL) {
blkdev->type = xenstore_read_be_str(&blkdev->xendev, "type");
blkdev->type = xenstore_read_be_str(xendev, "type");
}
if (blkdev->dev == NULL) {
blkdev->dev = xenstore_read_be_str(&blkdev->xendev, "dev");
blkdev->dev = xenstore_read_be_str(xendev, "dev");
}
if (blkdev->devtype == NULL) {
blkdev->devtype = xenstore_read_be_str(&blkdev->xendev, "device-type");
blkdev->devtype = xenstore_read_be_str(xendev, "device-type");
}
directiosafe = xenstore_read_be_str(&blkdev->xendev, "direct-io-safe");
directiosafe = xenstore_read_be_str(xendev, "direct-io-safe");
blkdev->directiosafe = (directiosafe && atoi(directiosafe));
/* do we have all we need? */
@ -706,10 +709,10 @@ static int blk_init(struct XenDevice *xendev)
/* fill info
* blk_connect supplies sector-size and sectors
*/
xenstore_write_be_int(&blkdev->xendev, "feature-flush-cache", 1);
xenstore_write_be_int(&blkdev->xendev, "info", info);
xenstore_write_be_int(xendev, "feature-flush-cache", 1);
xenstore_write_be_int(xendev, "info", info);
xenstore_write_be_int(&blkdev->xendev, "max-ring-page-order",
xenstore_write_be_int(xendev, "max-ring-page-order",
MAX_RING_PAGE_ORDER);
blk_parse_discard(blkdev);
@ -761,7 +764,7 @@ static int blk_connect(struct XenDevice *xendev)
}
/* init qemu block driver */
index = (blkdev->xendev.dev - 202 * 256) / 16;
index = (xendev->dev - 202 * 256) / 16;
blkdev->dinfo = drive_get(IF_XEN, 0, index);
if (!blkdev->dinfo) {
Error *local_err = NULL;
@ -773,11 +776,11 @@ static int blk_connect(struct XenDevice *xendev)
}
/* setup via xenbus -> create new block driver instance */
xen_pv_printf(&blkdev->xendev, 2, "create new bdrv (xenbus setup)\n");
xen_pv_printf(xendev, 2, "create new bdrv (xenbus setup)\n");
blkdev->blk = blk_new_open(blkdev->filename, NULL, options,
qflags, &local_err);
if (!blkdev->blk) {
xen_pv_printf(&blkdev->xendev, 0, "error: %s\n",
xen_pv_printf(xendev, 0, "error: %s\n",
error_get_pretty(local_err));
error_free(local_err);
return -1;
@ -785,11 +788,11 @@ static int blk_connect(struct XenDevice *xendev)
blk_set_enable_write_cache(blkdev->blk, !writethrough);
} else {
/* setup via qemu cmdline -> already setup for us */
xen_pv_printf(&blkdev->xendev, 2,
xen_pv_printf(xendev, 2,
"get configured bdrv (cmdline setup)\n");
blkdev->blk = blk_by_legacy_dinfo(blkdev->dinfo);
if (blk_is_read_only(blkdev->blk) && !readonly) {
xen_pv_printf(&blkdev->xendev, 0, "Unexpected read-only drive");
xen_pv_printf(xendev, 0, "Unexpected read-only drive");
blkdev->blk = NULL;
return -1;
}
@ -802,7 +805,7 @@ static int blk_connect(struct XenDevice *xendev)
if (blkdev->file_size < 0) {
BlockDriverState *bs = blk_bs(blkdev->blk);
const char *drv_name = bs ? bdrv_get_format_name(bs) : NULL;
xen_pv_printf(&blkdev->xendev, 1, "blk_getlength: %d (%s) | drv %s\n",
xen_pv_printf(xendev, 1, "blk_getlength: %d (%s) | drv %s\n",
(int)blkdev->file_size, strerror(-blkdev->file_size),
drv_name ?: "-");
blkdev->file_size = 0;
@ -814,15 +817,15 @@ static int blk_connect(struct XenDevice *xendev)
blkdev->file_size, blkdev->file_size >> 20);
/* Fill in number of sector size and number of sectors */
xenstore_write_be_int(&blkdev->xendev, "sector-size", blkdev->file_blk);
xenstore_write_be_int64(&blkdev->xendev, "sectors",
xenstore_write_be_int(xendev, "sector-size", blkdev->file_blk);
xenstore_write_be_int64(xendev, "sectors",
blkdev->file_size / blkdev->file_blk);
if (xenstore_read_fe_int(&blkdev->xendev, "ring-page-order",
if (xenstore_read_fe_int(xendev, "ring-page-order",
&order) == -1) {
blkdev->nr_ring_ref = 1;
if (xenstore_read_fe_int(&blkdev->xendev, "ring-ref",
if (xenstore_read_fe_int(xendev, "ring-ref",
&ring_ref) == -1) {
return -1;
}
@ -839,7 +842,7 @@ static int blk_connect(struct XenDevice *xendev)
return -1;
}
if (xenstore_read_fe_int(&blkdev->xendev, key,
if (xenstore_read_fe_int(xendev, key,
&ring_ref) == -1) {
g_free(key);
return -1;
@ -854,18 +857,18 @@ static int blk_connect(struct XenDevice *xendev)
return -1;
}
if (xenstore_read_fe_int(&blkdev->xendev, "event-channel",
&blkdev->xendev.remote_port) == -1) {
if (xenstore_read_fe_int(xendev, "event-channel",
&xendev->remote_port) == -1) {
return -1;
}
if (!blkdev->xendev.protocol) {
if (!xendev->protocol) {
blkdev->protocol = BLKIF_PROTOCOL_NATIVE;
} else if (strcmp(blkdev->xendev.protocol, XEN_IO_PROTO_ABI_NATIVE) == 0) {
} else if (strcmp(xendev->protocol, XEN_IO_PROTO_ABI_NATIVE) == 0) {
blkdev->protocol = BLKIF_PROTOCOL_NATIVE;
} else if (strcmp(blkdev->xendev.protocol, XEN_IO_PROTO_ABI_X86_32) == 0) {
} else if (strcmp(xendev->protocol, XEN_IO_PROTO_ABI_X86_32) == 0) {
blkdev->protocol = BLKIF_PROTOCOL_X86_32;
} else if (strcmp(blkdev->xendev.protocol, XEN_IO_PROTO_ABI_X86_64) == 0) {
} else if (strcmp(xendev->protocol, XEN_IO_PROTO_ABI_X86_64) == 0) {
blkdev->protocol = BLKIF_PROTOCOL_X86_64;
} else {
blkdev->protocol = BLKIF_PROTOCOL_NATIVE;
@ -896,7 +899,6 @@ static int blk_connect(struct XenDevice *xendev)
max_grants = blkdev->nr_ring_ref;
xen_be_set_max_grant_refs(xendev, max_grants);
blkdev->sring = xen_be_map_grant_refs(xendev, blkdev->ring_ref,
blkdev->nr_ring_ref,
PROT_READ | PROT_WRITE);
@ -929,12 +931,12 @@ static int blk_connect(struct XenDevice *xendev)
blk_set_aio_context(blkdev->blk, blkdev->ctx);
xen_be_bind_evtchn(&blkdev->xendev);
xen_be_bind_evtchn(xendev);
xen_pv_printf(&blkdev->xendev, 1, "ok: proto %s, nr-ring-ref %u, "
xen_pv_printf(xendev, 1, "ok: proto %s, nr-ring-ref %u, "
"remote port %d, local port %d\n",
blkdev->xendev.protocol, blkdev->nr_ring_ref,
blkdev->xendev.remote_port, blkdev->xendev.local_port);
xendev->protocol, blkdev->nr_ring_ref,
xendev->remote_port, xendev->local_port);
return 0;
}
@ -952,7 +954,7 @@ static void blk_disconnect(struct XenDevice *xendev)
blk_unref(blkdev->blk);
blkdev->blk = NULL;
}
xen_pv_unbind_evtchn(&blkdev->xendev);
xen_pv_unbind_evtchn(xendev);
aio_context_release(blkdev->ctx);