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SUSE:SLE-15-SP2:GA
qemu-linux-user
0036-xen-add-block-resize-support-for-xe.patch
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File 0036-xen-add-block-resize-support-for-xe.patch of Package qemu-linux-user
From: Bruce Rogers <brogers@suse.com> Date: Fri, 8 Jun 2018 11:04:36 -0600 Subject: xen: add block resize support for xen disks Provide monitor naming of xen disks, and plumb guest driver notification through xenstore of resizing instigated via the monitor. [BR: minor edits to pass qemu's checkpatch script] Signed-off-by: Bruce Rogers <brogers@suse.com> --- block/block-backend.c | 12 +++++++++++- blockdev.c | 8 ++++++++ hw/block/xen_disk.c | 24 ++++++++++++++++++++++++ include/hw/xen/xen.h | 4 ++++ include/sysemu/block-backend.h | 1 + stubs/xen-common.c | 9 +++++++++ 6 files changed, 57 insertions(+), 1 deletion(-) diff --git a/block/block-backend.c b/block/block-backend.c index 3a3d888633d86b602e3c13bb2393..35e3edb861508c208a9c062fe6e8 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -23,6 +23,7 @@ #include "qemu/option.h" #include "trace.h" #include "migration/misc.h" +#include "hw/xen/xen.h" /* Number of coroutines to reserve per attached device model */ #define COROUTINE_POOL_RESERVATION 64 @@ -910,7 +911,9 @@ char *blk_get_attached_dev_id(BlockBackend *blk) { DeviceState *dev; - assert(!blk->legacy_dev); + if (blk->legacy_dev) { + return xen_blk_get_attached_dev_id(blk->dev); + } dev = blk->dev; if (!dev) { @@ -2016,6 +2019,13 @@ int blk_truncate(BlockBackend *blk, int64_t offset, PreallocMode prealloc, return bdrv_truncate(blk->root, offset, prealloc, errp); } +void blk_legacy_resize_cb(BlockBackend *blk) +{ + if (blk->legacy_dev) { + xen_blk_resize_cb(blk->dev); + } +} + static void blk_pdiscard_entry(void *opaque) { BlkRwCo *rwco = opaque; diff --git a/blockdev.c b/blockdev.c index 81f95d920b5412726bcf6fbcf4ed..e67116974e23cb39c4e5ae88b8eb 100644 --- a/blockdev.c +++ b/blockdev.c @@ -3091,6 +3091,7 @@ void qmp_block_resize(bool has_device, const char *device, { Error *local_err = NULL; BlockBackend *blk = NULL; + BlockBackend *cb_blk = NULL; BlockDriverState *bs; AioContext *aio_context; int ret; @@ -3103,6 +3104,10 @@ void qmp_block_resize(bool has_device, const char *device, return; } + if (has_device) { + cb_blk = blk_by_name(device); + } + aio_context = bdrv_get_aio_context(bs); aio_context_acquire(aio_context); @@ -3129,6 +3134,9 @@ void qmp_block_resize(bool has_device, const char *device, bdrv_drained_begin(bs); ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp); + if (!ret && cb_blk) { + blk_legacy_resize_cb(cb_blk); + } bdrv_drained_end(bs); out: diff --git a/hw/block/xen_disk.c b/hw/block/xen_disk.c index ddd5c7cbfd00a2713dee1501d05b..d9a55faf27c6aaf6b4fb39043c6e 100644 --- a/hw/block/xen_disk.c +++ b/hw/block/xen_disk.c @@ -761,6 +761,7 @@ static int blk_connect(struct XenDevice *xendev) int order, ring_ref; unsigned int ring_size, max_grants; unsigned int i; + Error *errp = NULL; trace_xen_disk_connect(xendev->name); @@ -821,6 +822,13 @@ static int blk_connect(struct XenDevice *xendev) blk_ref(blkdev->blk); } blk_attach_dev_legacy(blkdev->blk, blkdev); + if (!monitor_add_blk(blkdev->blk, g_strdup(blkdev->dev), &errp)) { + xen_pv_printf(&blkdev->xendev, 0, "error: %s\n", + error_get_pretty(errp)); + error_free(errp); + return -1; + } + blkdev->file_size = blk_getlength(blkdev->blk); if (blkdev->file_size < 0) { BlockDriverState *bs = blk_bs(blkdev->blk); @@ -971,6 +979,7 @@ static void blk_disconnect(struct XenDevice *xendev) if (blkdev->blk) { blk_set_aio_context(blkdev->blk, qemu_get_aio_context()); blk_detach_dev(blkdev->blk, blkdev); + monitor_remove_blk(blkdev->blk); blk_unref(blkdev->blk); blkdev->blk = NULL; } @@ -1018,6 +1027,21 @@ static void blk_event(struct XenDevice *xendev) qemu_bh_schedule(blkdev->bh); } +void xen_blk_resize_cb(void *dev) +{ + struct XenBlkDev *blkdev = dev; + blkdev->file_size = blk_getlength(blkdev->blk); + xenstore_write_be_int64(&blkdev->xendev, "sectors", + blkdev->file_size / blkdev->file_blk); + xen_be_set_state(&blkdev->xendev, blkdev->xendev.be_state); +} + +char *xen_blk_get_attached_dev_id(void *dev) +{ + struct XenBlkDev *blkdev = dev; + return g_strdup_printf("xen-qdisk-%i", blkdev->xendev.dev); +} + struct XenDevOps xen_blkdev_ops = { .flags = DEVOPS_FLAG_NEED_GNTDEV, .size = sizeof(struct XenBlkDev), diff --git a/include/hw/xen/xen.h b/include/hw/xen/xen.h index 7efcdaa8fe92d7f31e3f3d22d71e..45c8c0b6f757dbbea7331e665caf 100644 --- a/include/hw/xen/xen.h +++ b/include/hw/xen/xen.h @@ -48,4 +48,8 @@ void xen_hvm_modified_memory(ram_addr_t start, ram_addr_t length); void xen_register_framebuffer(struct MemoryRegion *mr); +void xen_blk_resize_cb(void *dev); + +char *xen_blk_get_attached_dev_id(void *dev); + #endif /* QEMU_HW_XEN_H */ diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h index c96bcdee143fcb10da81331aedd8..0488cf45fffe9271314a3e1101f5 100644 --- a/include/sysemu/block-backend.h +++ b/include/sysemu/block-backend.h @@ -236,5 +236,6 @@ int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in, BlockBackend *blk_out, int64_t off_out, int bytes, BdrvRequestFlags read_flags, BdrvRequestFlags write_flags); +void blk_legacy_resize_cb(BlockBackend *blk); #endif diff --git a/stubs/xen-common.c b/stubs/xen-common.c index 09fce2dd364a4adcc333c6713212..91542fc0196ec15ae8d070e7595b 100644 --- a/stubs/xen-common.c +++ b/stubs/xen-common.c @@ -12,3 +12,12 @@ void xenstore_store_pv_console_info(int i, Chardev *chr) { } + +void xen_blk_resize_cb(void *dev) +{ +} + +char *xen_blk_get_attached_dev_id(void *dev) +{ + return g_strdup(""); +}
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