block/ssh: Make ssh_grow_file() blocking
At runtime (that is, during a future ssh_truncate()), the SSH session is non-blocking. However, ssh_truncate() (or rather, bdrv_truncate() in general) is not a coroutine, so this resize operation needs to block. For ssh_create(), that is fine, too; the session is never set to non-blocking anyway. Signed-off-by: Max Reitz <mreitz@redhat.com> Message-id: 20180214204915.7980-3-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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@ -803,17 +803,24 @@ static int ssh_file_open(BlockDriverState *bs, QDict *options, int bdrv_flags,
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return ret;
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return ret;
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}
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}
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/* Note: This is a blocking operation */
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static int ssh_grow_file(BDRVSSHState *s, int64_t offset, Error **errp)
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static int ssh_grow_file(BDRVSSHState *s, int64_t offset, Error **errp)
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{
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{
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ssize_t ret;
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ssize_t ret;
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char c[1] = { '\0' };
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char c[1] = { '\0' };
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int was_blocking = libssh2_session_get_blocking(s->session);
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/* offset must be strictly greater than the current size so we do
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/* offset must be strictly greater than the current size so we do
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* not overwrite anything */
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* not overwrite anything */
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assert(offset > 0 && offset > s->attrs.filesize);
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assert(offset > 0 && offset > s->attrs.filesize);
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libssh2_session_set_blocking(s->session, 1);
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libssh2_sftp_seek64(s->sftp_handle, offset - 1);
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libssh2_sftp_seek64(s->sftp_handle, offset - 1);
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ret = libssh2_sftp_write(s->sftp_handle, c, 1);
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ret = libssh2_sftp_write(s->sftp_handle, c, 1);
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libssh2_session_set_blocking(s->session, was_blocking);
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if (ret < 0) {
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if (ret < 0) {
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sftp_error_setg(errp, s, "Failed to grow file");
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sftp_error_setg(errp, s, "Failed to grow file");
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return -EIO;
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return -EIO;
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