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block: Move bdrv_truncate() implementation to io.c
This moves the bdrv_truncate() implementation from block.c to block/io.c so it can have access to the tracked requests infrastructure. This involves making refresh_total_sectors() public (in block_int.h). Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf
parent
47e86b868d
commit
3d9f2d2af6
111
block.c
111
block.c
@ -725,7 +725,7 @@ static int find_image_format(BlockBackend *file, const char *filename,
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* Set the current 'total_sectors' value
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* Return 0 on success, -errno on error.
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*/
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static int refresh_total_sectors(BlockDriverState *bs, int64_t hint)
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int refresh_total_sectors(BlockDriverState *bs, int64_t hint)
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{
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BlockDriver *drv = bs->drv;
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@ -2226,16 +2226,6 @@ static void bdrv_parent_cb_change_media(BlockDriverState *bs, bool load)
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}
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}
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static void bdrv_parent_cb_resize(BlockDriverState *bs)
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{
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BdrvChild *c;
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QLIST_FOREACH(c, &bs->parents, next_parent) {
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if (c->role->resize) {
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c->role->resize(c);
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}
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}
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}
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/*
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* Sets the backing file link of a BDS. A new reference is created; callers
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* which don't need their own reference any more must call bdrv_unref().
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@ -3785,105 +3775,6 @@ exit:
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return ret;
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}
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/**
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* Truncate file to 'offset' bytes (needed only for file protocols)
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*/
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int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset,
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PreallocMode prealloc, Error **errp)
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{
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BlockDriverState *bs = child->bs;
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BlockDriver *drv = bs->drv;
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int ret;
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assert(child->perm & BLK_PERM_RESIZE);
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/* if bs->drv == NULL, bs is closed, so there's nothing to do here */
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if (!drv) {
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error_setg(errp, "No medium inserted");
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return -ENOMEDIUM;
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}
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if (offset < 0) {
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error_setg(errp, "Image size cannot be negative");
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return -EINVAL;
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}
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bdrv_inc_in_flight(bs);
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if (!drv->bdrv_co_truncate) {
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if (bs->file && drv->is_filter) {
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ret = bdrv_co_truncate(bs->file, offset, prealloc, errp);
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goto out;
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}
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error_setg(errp, "Image format driver does not support resize");
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ret = -ENOTSUP;
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goto out;
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}
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if (bs->read_only) {
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error_setg(errp, "Image is read-only");
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ret = -EACCES;
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goto out;
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}
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assert(!(bs->open_flags & BDRV_O_INACTIVE));
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ret = drv->bdrv_co_truncate(bs, offset, prealloc, errp);
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if (ret < 0) {
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goto out;
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}
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ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Could not refresh total sector count");
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} else {
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offset = bs->total_sectors * BDRV_SECTOR_SIZE;
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}
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bdrv_dirty_bitmap_truncate(bs, offset);
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bdrv_parent_cb_resize(bs);
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atomic_inc(&bs->write_gen);
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out:
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bdrv_dec_in_flight(bs);
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return ret;
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}
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typedef struct TruncateCo {
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BdrvChild *child;
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int64_t offset;
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PreallocMode prealloc;
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Error **errp;
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int ret;
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} TruncateCo;
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static void coroutine_fn bdrv_truncate_co_entry(void *opaque)
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{
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TruncateCo *tco = opaque;
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tco->ret = bdrv_co_truncate(tco->child, tco->offset, tco->prealloc,
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tco->errp);
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}
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int bdrv_truncate(BdrvChild *child, int64_t offset, PreallocMode prealloc,
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Error **errp)
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{
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Coroutine *co;
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TruncateCo tco = {
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.child = child,
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.offset = offset,
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.prealloc = prealloc,
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.errp = errp,
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.ret = NOT_DONE,
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};
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if (qemu_in_coroutine()) {
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/* Fast-path if already in coroutine context */
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bdrv_truncate_co_entry(&tco);
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} else {
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co = qemu_coroutine_create(bdrv_truncate_co_entry, &tco);
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qemu_coroutine_enter(co);
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BDRV_POLL_WHILE(child->bs, tco.ret == NOT_DONE);
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}
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return tco.ret;
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}
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/**
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* Length of a allocated file in bytes. Sparse files are counted by actual
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* allocated space. Return < 0 if error or unknown.
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109
block/io.c
109
block/io.c
@ -3020,3 +3020,112 @@ int coroutine_fn bdrv_co_copy_range(BdrvChild *src, uint64_t src_offset,
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bdrv_dec_in_flight(dst_bs);
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return ret;
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}
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static void bdrv_parent_cb_resize(BlockDriverState *bs)
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{
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BdrvChild *c;
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QLIST_FOREACH(c, &bs->parents, next_parent) {
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if (c->role->resize) {
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c->role->resize(c);
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}
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}
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}
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/**
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* Truncate file to 'offset' bytes (needed only for file protocols)
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*/
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int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset,
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PreallocMode prealloc, Error **errp)
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{
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BlockDriverState *bs = child->bs;
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BlockDriver *drv = bs->drv;
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int ret;
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assert(child->perm & BLK_PERM_RESIZE);
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/* if bs->drv == NULL, bs is closed, so there's nothing to do here */
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if (!drv) {
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error_setg(errp, "No medium inserted");
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return -ENOMEDIUM;
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}
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if (offset < 0) {
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error_setg(errp, "Image size cannot be negative");
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return -EINVAL;
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}
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bdrv_inc_in_flight(bs);
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if (!drv->bdrv_co_truncate) {
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if (bs->file && drv->is_filter) {
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ret = bdrv_co_truncate(bs->file, offset, prealloc, errp);
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goto out;
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}
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error_setg(errp, "Image format driver does not support resize");
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ret = -ENOTSUP;
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goto out;
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}
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if (bs->read_only) {
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error_setg(errp, "Image is read-only");
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ret = -EACCES;
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goto out;
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}
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assert(!(bs->open_flags & BDRV_O_INACTIVE));
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ret = drv->bdrv_co_truncate(bs, offset, prealloc, errp);
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if (ret < 0) {
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goto out;
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}
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ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Could not refresh total sector count");
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} else {
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offset = bs->total_sectors * BDRV_SECTOR_SIZE;
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}
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bdrv_dirty_bitmap_truncate(bs, offset);
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bdrv_parent_cb_resize(bs);
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atomic_inc(&bs->write_gen);
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out:
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bdrv_dec_in_flight(bs);
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return ret;
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}
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typedef struct TruncateCo {
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BdrvChild *child;
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int64_t offset;
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PreallocMode prealloc;
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Error **errp;
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int ret;
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} TruncateCo;
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static void coroutine_fn bdrv_truncate_co_entry(void *opaque)
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{
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TruncateCo *tco = opaque;
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tco->ret = bdrv_co_truncate(tco->child, tco->offset, tco->prealloc,
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tco->errp);
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}
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int bdrv_truncate(BdrvChild *child, int64_t offset, PreallocMode prealloc,
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Error **errp)
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{
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Coroutine *co;
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TruncateCo tco = {
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.child = child,
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.offset = offset,
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.prealloc = prealloc,
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.errp = errp,
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.ret = NOT_DONE,
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};
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if (qemu_in_coroutine()) {
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/* Fast-path if already in coroutine context */
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bdrv_truncate_co_entry(&tco);
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} else {
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co = qemu_coroutine_create(bdrv_truncate_co_entry, &tco);
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qemu_coroutine_enter(co);
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BDRV_POLL_WHILE(child->bs, tco.ret == NOT_DONE);
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}
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return tco.ret;
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}
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@ -1157,4 +1157,6 @@ int coroutine_fn bdrv_co_copy_range_to(BdrvChild *src, uint64_t src_offset,
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BdrvChild *dst, uint64_t dst_offset,
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uint64_t bytes, BdrvRequestFlags flags);
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int refresh_total_sectors(BlockDriverState *bs, int64_t hint);
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#endif /* BLOCK_INT_H */
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