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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PULL 11/25] xen: remove unnecessary code from dataplane/xen-block.c
From: Paul Durrant <paul.durrant@xxxxxxxxxx>
Not all of the code duplicated from xen_disk.c is required as the basis for
the new dataplane implementation so this patch removes extraneous code,
along with the legacy #includes and calls to the legacy xen_pv_printf()
function. Error messages are changed to be reported using error_report().
NOTE: The code is still not yet built. Further transformations will be
required to make it correctly interface to the new XenBus/XenDevice
framework. They will be delivered in a subsequent patch.
Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
Acked-by: Anthony Perard <anthony.perard@xxxxxxxxxx>
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
hw/block/dataplane/xen-block.c | 429 ++-------------------------------
1 file changed, 23 insertions(+), 406 deletions(-)
diff --git a/hw/block/dataplane/xen-block.c b/hw/block/dataplane/xen-block.c
index 9fae50534e..228472320a 100644
--- a/hw/block/dataplane/xen-block.c
+++ b/hw/block/dataplane/xen-block.c
@@ -1,45 +1,23 @@
/*
- * xen paravirt block device backend
+ * Copyright (c) 2018 Citrix Systems Inc.
+ * (c) Gerd Hoffmann <kraxel@xxxxxxxxxx>
*
- * (c) Gerd Hoffmann <kraxel@xxxxxxxxxx>
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; under version 2 of the License.
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; under version 2 of the License.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
*
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
*
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, see <http://www.gnu.org/licenses/>.
- *
- * Contributions after 2012-01-13 are licensed under the terms of the
- * GNU GPL, version 2 or (at your option) any later version.
+ * Contributions after 2012-01-13 are licensed under the terms of the
+ * GNU GPL, version 2 or (at your option) any later version.
*/
-#include "qemu/osdep.h"
-#include "qemu/units.h"
-#include <sys/ioctl.h>
-#include <sys/uio.h>
-
-#include "hw/hw.h"
-#include "hw/xen/xen_backend.h"
-#include "xen_blkif.h"
-#include "sysemu/blockdev.h"
-#include "sysemu/iothread.h"
-#include "sysemu/block-backend.h"
-#include "qapi/error.h"
-#include "qapi/qmp/qdict.h"
-#include "qapi/qmp/qstring.h"
-#include "trace.h"
-
-/* ------------------------------------------------------------- */
-
-#define BLOCK_SIZE 512
-#define IOCB_COUNT (BLKIF_MAX_SEGMENTS_PER_REQUEST + 2)
-
struct ioreq {
blkif_request_t req;
int16_t status;
@@ -101,8 +79,6 @@ struct XenBlkDev {
AioContext *ctx;
};
-/* ------------------------------------------------------------- */
-
static void ioreq_reset(struct ioreq *ioreq)
{
memset(&ioreq->req, 0, sizeof(ioreq->req));
@@ -183,11 +159,6 @@ static int ioreq_parse(struct ioreq *ioreq)
size_t len;
int i;
- 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);
switch (ioreq->req.operation) {
case BLKIF_OP_READ:
break;
@@ -202,28 +173,27 @@ static int ioreq_parse(struct ioreq *ioreq)
case BLKIF_OP_DISCARD:
return 0;
default:
- xen_pv_printf(xendev, 0, "error: unknown operation (%d)\n",
- ioreq->req.operation);
+ error_report("error: unknown operation (%d)", ioreq->req.operation);
goto err;
};
if (ioreq->req.operation != BLKIF_OP_READ && blkdev->mode[0] != 'w') {
- xen_pv_printf(xendev, 0, "error: write req for ro device\n");
+ error_report("error: write req for ro device");
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(xendev, 0, "error: nr_segments too big\n");
+ error_report("error: nr_segments too big");
goto err;
}
if (ioreq->req.seg[i].first_sect > ioreq->req.seg[i].last_sect) {
- xen_pv_printf(xendev, 0, "error: first > last sector\n");
+ error_report("error: first > last sector");
goto err;
}
if (ioreq->req.seg[i].last_sect * BLOCK_SIZE >= XC_PAGE_SIZE) {
- xen_pv_printf(xendev, 0, "error: page crossing\n");
+ error_report("error: page crossing");
goto err;
}
@@ -232,7 +202,7 @@ static int ioreq_parse(struct ioreq *ioreq)
ioreq->size += len;
}
if (ioreq->start + ioreq->size > blkdev->file_size) {
- xen_pv_printf(xendev, 0, "error: access beyond end of file\n");
+ error_report("error: access beyond end of file");
goto err;
}
return 0;
@@ -278,8 +248,7 @@ static int ioreq_grant_copy(struct ioreq *ioreq)
rc = xen_be_copy_grant_refs(xendev, to_domain, segs, count);
if (rc) {
- xen_pv_printf(xendev, 0,
- "failed to copy data %d\n", rc);
+ error_report("failed to copy data %d", rc);
ioreq->aio_errors++;
return -1;
}
@@ -298,8 +267,9 @@ static void qemu_aio_complete(void *opaque, int ret)
aio_context_acquire(blkdev->ctx);
if (ret != 0) {
- xen_pv_printf(xendev, 0, "%s I/O error\n",
- ioreq->req.operation == BLKIF_OP_READ ? "read" :
"write");
+ error_report("%s I/O error",
+ ioreq->req.operation == BLKIF_OP_READ ?
+ "read" : "write");
ioreq->aio_errors++;
}
@@ -605,8 +575,6 @@ static void blk_handle_requests(struct XenBlkDev *blkdev)
}
}
-/* ------------------------------------------------------------- */
-
static void blk_bh(void *opaque)
{
struct XenBlkDev *blkdev = opaque;
@@ -634,346 +602,6 @@ static void blk_alloc(struct XenLegacyDevice *xendev)
blkdev->bh = aio_bh_new(blkdev->ctx, blk_bh, blkdev);
}
-static void blk_parse_discard(struct XenBlkDev *blkdev)
-{
- struct XenLegacyDevice *xendev = &blkdev->xendev;
- int enable;
-
- blkdev->feature_discard = true;
-
- if (xenstore_read_be_int(xendev, "discard-enable", &enable) == 0) {
- blkdev->feature_discard = !!enable;
- }
-
- if (blkdev->feature_discard) {
- xenstore_write_be_int(xendev, "feature-discard", 1);
- }
-}
-
-static int blk_init(struct XenLegacyDevice *xendev)
-{
- struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
- int info = 0;
- char *directiosafe = NULL;
-
- trace_xen_disk_init(xendev->name);
-
- /* read xenstore entries */
- if (blkdev->params == NULL) {
- char *h = NULL;
- blkdev->params = xenstore_read_be_str(xendev, "params");
- if (blkdev->params != NULL) {
- h = strchr(blkdev->params, ':');
- }
- if (h != NULL) {
- blkdev->fileproto = blkdev->params;
- blkdev->filename = h + 1;
- *h = 0;
- } else {
- blkdev->fileproto = "<unset>";
- blkdev->filename = blkdev->params;
- }
- }
- if (!strcmp("aio", blkdev->fileproto)) {
- blkdev->fileproto = "raw";
- }
- if (!strcmp("vhd", blkdev->fileproto)) {
- blkdev->fileproto = "vpc";
- }
- if (blkdev->mode == NULL) {
- blkdev->mode = xenstore_read_be_str(xendev, "mode");
- }
- if (blkdev->type == NULL) {
- blkdev->type = xenstore_read_be_str(xendev, "type");
- }
- if (blkdev->dev == NULL) {
- blkdev->dev = xenstore_read_be_str(xendev, "dev");
- }
- if (blkdev->devtype == NULL) {
- blkdev->devtype = xenstore_read_be_str(xendev, "device-type");
- }
- directiosafe = xenstore_read_be_str(xendev, "direct-io-safe");
- blkdev->directiosafe = (directiosafe && atoi(directiosafe));
-
- /* do we have all we need? */
- if (blkdev->params == NULL ||
- blkdev->mode == NULL ||
- blkdev->type == NULL ||
- blkdev->dev == NULL) {
- goto out_error;
- }
-
- /* read-only ? */
- if (strcmp(blkdev->mode, "w")) {
- info |= VDISK_READONLY;
- }
-
- /* cdrom ? */
- if (blkdev->devtype && !strcmp(blkdev->devtype, "cdrom")) {
- info |= VDISK_CDROM;
- }
-
- blkdev->file_blk = BLOCK_SIZE;
-
- /* fill info
- * blk_connect supplies sector-size and sectors
- */
- xenstore_write_be_int(xendev, "feature-flush-cache", 1);
- xenstore_write_be_int(xendev, "info", info);
-
- xenstore_write_be_int(xendev, "max-ring-page-order",
- MAX_RING_PAGE_ORDER);
-
- blk_parse_discard(blkdev);
-
- g_free(directiosafe);
- return 0;
-
-out_error:
- g_free(blkdev->params);
- blkdev->params = NULL;
- g_free(blkdev->mode);
- blkdev->mode = NULL;
- g_free(blkdev->type);
- blkdev->type = NULL;
- g_free(blkdev->dev);
- blkdev->dev = NULL;
- g_free(blkdev->devtype);
- blkdev->devtype = NULL;
- g_free(directiosafe);
- blkdev->directiosafe = false;
- return -1;
-}
-
-static int blk_connect(struct XenLegacyDevice *xendev)
-{
- struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
- int index, qflags;
- bool readonly = true;
- bool writethrough = true;
- int order, ring_ref;
- unsigned int ring_size, max_grants;
- unsigned int i;
-
- trace_xen_disk_connect(xendev->name);
-
- /* read-only ? */
- if (blkdev->directiosafe) {
- qflags = BDRV_O_NOCACHE | BDRV_O_NATIVE_AIO;
- } else {
- qflags = 0;
- writethrough = false;
- }
- if (strcmp(blkdev->mode, "w") == 0) {
- qflags |= BDRV_O_RDWR;
- readonly = false;
- }
- if (blkdev->feature_discard) {
- qflags |= BDRV_O_UNMAP;
- }
-
- /* init qemu block driver */
- index = (xendev->dev - 202 * 256) / 16;
- blkdev->dinfo = drive_get(IF_XEN, 0, index);
- if (!blkdev->dinfo) {
- Error *local_err = NULL;
- QDict *options = NULL;
-
- if (strcmp(blkdev->fileproto, "<unset>")) {
- options = qdict_new();
- qdict_put_str(options, "driver", blkdev->fileproto);
- }
-
- /* setup via xenbus -> create new block driver instance */
- 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(xendev, 0, "error: %s\n",
- error_get_pretty(local_err));
- error_free(local_err);
- return -1;
- }
- blk_set_enable_write_cache(blkdev->blk, !writethrough);
- } else {
- /* setup via qemu cmdline -> already setup for us */
- 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(xendev, 0, "Unexpected read-only drive");
- blkdev->blk = NULL;
- return -1;
- }
- /* blkdev->blk is not create by us, we get a reference
- * so we can blk_unref() unconditionally */
- blk_ref(blkdev->blk);
- }
- blk_attach_dev_legacy(blkdev->blk, blkdev);
- blkdev->file_size = blk_getlength(blkdev->blk);
- 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(xendev, 1, "blk_getlength: %d (%s) | drv %s\n",
- (int)blkdev->file_size, strerror(-blkdev->file_size),
- drv_name ?: "-");
- blkdev->file_size = 0;
- }
-
- xen_pv_printf(xendev, 1, "type \"%s\", fileproto \"%s\", filename \"%s\","
- " size %" PRId64 " (%" PRId64 " MB)\n",
- blkdev->type, blkdev->fileproto, blkdev->filename,
- blkdev->file_size, blkdev->file_size / MiB);
-
- /* Fill in number of sector size and number of 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(xendev, "ring-page-order",
- &order) == -1) {
- blkdev->nr_ring_ref = 1;
-
- if (xenstore_read_fe_int(xendev, "ring-ref",
- &ring_ref) == -1) {
- return -1;
- }
- blkdev->ring_ref[0] = ring_ref;
-
- } else if (order >= 0 && order <= MAX_RING_PAGE_ORDER) {
- blkdev->nr_ring_ref = 1 << order;
-
- for (i = 0; i < blkdev->nr_ring_ref; i++) {
- char *key;
-
- key = g_strdup_printf("ring-ref%u", i);
- if (!key) {
- return -1;
- }
-
- if (xenstore_read_fe_int(xendev, key,
- &ring_ref) == -1) {
- g_free(key);
- return -1;
- }
- blkdev->ring_ref[i] = ring_ref;
-
- g_free(key);
- }
- } else {
- xen_pv_printf(xendev, 0, "invalid ring-page-order: %d\n",
- order);
- return -1;
- }
-
- if (xenstore_read_fe_int(xendev, "event-channel",
- &xendev->remote_port) == -1) {
- return -1;
- }
-
- if (!xendev->protocol) {
- blkdev->protocol = BLKIF_PROTOCOL_NATIVE;
- } else if (strcmp(xendev->protocol, XEN_IO_PROTO_ABI_NATIVE) == 0) {
- blkdev->protocol = BLKIF_PROTOCOL_NATIVE;
- } else if (strcmp(xendev->protocol, XEN_IO_PROTO_ABI_X86_32) == 0) {
- blkdev->protocol = BLKIF_PROTOCOL_X86_32;
- } else if (strcmp(xendev->protocol, XEN_IO_PROTO_ABI_X86_64) == 0) {
- blkdev->protocol = BLKIF_PROTOCOL_X86_64;
- } else {
- blkdev->protocol = BLKIF_PROTOCOL_NATIVE;
- }
-
- ring_size = XC_PAGE_SIZE * blkdev->nr_ring_ref;
- switch (blkdev->protocol) {
- case BLKIF_PROTOCOL_NATIVE:
- {
- blkdev->max_requests = __CONST_RING_SIZE(blkif, ring_size);
- break;
- }
- case BLKIF_PROTOCOL_X86_32:
- {
- blkdev->max_requests = __CONST_RING_SIZE(blkif_x86_32, ring_size);
- break;
- }
- case BLKIF_PROTOCOL_X86_64:
- {
- blkdev->max_requests = __CONST_RING_SIZE(blkif_x86_64, ring_size);
- break;
- }
- default:
- return -1;
- }
-
- /* Add on the number needed for the ring pages */
- 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);
- if (!blkdev->sring) {
- return -1;
- }
-
- switch (blkdev->protocol) {
- case BLKIF_PROTOCOL_NATIVE:
- {
- blkif_sring_t *sring_native = blkdev->sring;
- BACK_RING_INIT(&blkdev->rings.native, sring_native, ring_size);
- break;
- }
- case BLKIF_PROTOCOL_X86_32:
- {
- blkif_x86_32_sring_t *sring_x86_32 = blkdev->sring;
-
- BACK_RING_INIT(&blkdev->rings.x86_32_part, sring_x86_32, ring_size);
- break;
- }
- case BLKIF_PROTOCOL_X86_64:
- {
- blkif_x86_64_sring_t *sring_x86_64 = blkdev->sring;
-
- BACK_RING_INIT(&blkdev->rings.x86_64_part, sring_x86_64, ring_size);
- break;
- }
- }
-
- blk_set_aio_context(blkdev->blk, blkdev->ctx);
-
- xen_be_bind_evtchn(xendev);
-
- xen_pv_printf(xendev, 1, "ok: proto %s, nr-ring-ref %u, "
- "remote port %d, local port %d\n",
- xendev->protocol, blkdev->nr_ring_ref,
- xendev->remote_port, xendev->local_port);
- return 0;
-}
-
-static void blk_disconnect(struct XenLegacyDevice *xendev)
-{
- struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
-
- trace_xen_disk_disconnect(xendev->name);
-
- aio_context_acquire(blkdev->ctx);
-
- if (blkdev->blk) {
- blk_set_aio_context(blkdev->blk, qemu_get_aio_context());
- blk_detach_dev(blkdev->blk, blkdev);
- blk_unref(blkdev->blk);
- blkdev->blk = NULL;
- }
- xen_pv_unbind_evtchn(xendev);
-
- aio_context_release(blkdev->ctx);
-
- if (blkdev->sring) {
- xen_be_unmap_grant_refs(xendev, blkdev->sring,
- blkdev->nr_ring_ref);
- blkdev->sring = NULL;
- }
-}
-
static int blk_free(struct XenLegacyDevice *xendev)
{
struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
@@ -1006,14 +634,3 @@ static void blk_event(struct XenLegacyDevice *xendev)
qemu_bh_schedule(blkdev->bh);
}
-
-struct XenDevOps xen_blkdev_ops = {
- .flags = DEVOPS_FLAG_NEED_GNTDEV,
- .size = sizeof(struct XenBlkDev),
- .alloc = blk_alloc,
- .init = blk_init,
- .initialise = blk_connect,
- .disconnect = blk_disconnect,
- .event = blk_event,
- .free = blk_free,
-};
--
Anthony PERARD
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