block/ssh: Add basic .bdrv_truncate()
libssh2 does not seem to offer real truncation support, so we can only grow files -- but that is better than nothing. Signed-off-by: Max Reitz <mreitz@redhat.com> Message-id: 20180214204915.7980-4-mreitz@redhat.com Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Richard W.M. Jones <rjones@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
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624f3006b8
24
block/ssh.c
24
block/ssh.c
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@ -1220,6 +1220,29 @@ static int64_t ssh_getlength(BlockDriverState *bs)
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return length;
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return length;
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}
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}
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static int ssh_truncate(BlockDriverState *bs, int64_t offset,
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PreallocMode prealloc, Error **errp)
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{
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BDRVSSHState *s = bs->opaque;
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if (prealloc != PREALLOC_MODE_OFF) {
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error_setg(errp, "Unsupported preallocation mode '%s'",
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PreallocMode_str(prealloc));
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return -ENOTSUP;
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}
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if (offset < s->attrs.filesize) {
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error_setg(errp, "ssh driver does not support shrinking files");
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return -ENOTSUP;
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}
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if (offset == s->attrs.filesize) {
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return 0;
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}
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return ssh_grow_file(s, offset, errp);
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}
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static BlockDriver bdrv_ssh = {
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static BlockDriver bdrv_ssh = {
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.format_name = "ssh",
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.format_name = "ssh",
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.protocol_name = "ssh",
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.protocol_name = "ssh",
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@ -1232,6 +1255,7 @@ static BlockDriver bdrv_ssh = {
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.bdrv_co_readv = ssh_co_readv,
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.bdrv_co_readv = ssh_co_readv,
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.bdrv_co_writev = ssh_co_writev,
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.bdrv_co_writev = ssh_co_writev,
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.bdrv_getlength = ssh_getlength,
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.bdrv_getlength = ssh_getlength,
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.bdrv_truncate = ssh_truncate,
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.bdrv_co_flush_to_disk = ssh_co_flush,
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.bdrv_co_flush_to_disk = ssh_co_flush,
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.create_opts = &ssh_create_opts,
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.create_opts = &ssh_create_opts,
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};
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};
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