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block: Add @exact parameter to bdrv_co_truncate()

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We have two drivers (iscsi and file-posix) that (in some cases) return
success from their .bdrv_co_truncate() implementation if the block
device is larger than the requested offset, but cannot be shrunk.  Some
callers do not want that behavior, so this patch adds a new parameter
that they can use to turn off that behavior.

This patch just adds the parameter and lets the block/io.c and
block/block-backend.c functions pass it around.  All other callers
always pass false and none of the implementations evaluate it, so that
this patch does not change existing behavior.  Future patches take care
of that.

Suggested-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-id: 20190918095144.955-5-mreitz@redhat.com
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2019-09-18 11:51:40 +02:00
parent 26536c7fc2
commit c80d8b06cf
31 changed files with 102 additions and 68 deletions
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6
block/block-backend.c
View file

@ -2072,15 +2072,15 @@ int blk_pwrite_compressed(BlockBackend *blk, int64_t offset, const void *buf,
BDRV_REQ_WRITE_COMPRESSED);
}
int blk_truncate(BlockBackend *blk, int64_t offset, PreallocMode prealloc,
Error **errp)
int blk_truncate(BlockBackend *blk, int64_t offset, bool exact,
PreallocMode prealloc, Error **errp)
{
if (!blk_is_available(blk)) {
error_setg(errp, "No medium inserted");
return -ENOMEDIUM;
}
return bdrv_truncate(blk->root, offset, prealloc, errp);
return bdrv_truncate(blk->root, offset, exact, prealloc, errp);
}
static void blk_pdiscard_entry(void *opaque)