From patchwork Mon Apr 22 02:07:55 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fam Zheng X-Patchwork-Id: 238279 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 9E9B22C00EB for ; Mon, 22 Apr 2013 12:09:59 +1000 (EST) Received: from localhost ([::1]:51056 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UU6Cb-0003X2-PY for incoming@patchwork.ozlabs.org; Sun, 21 Apr 2013 22:09:57 -0400 Received: from eggs.gnu.org ([208.118.235.92]:53860) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UU6B4-0001V2-J9 for qemu-devel@nongnu.org; Sun, 21 Apr 2013 22:08:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UU6B0-0006Nr-CL for qemu-devel@nongnu.org; Sun, 21 Apr 2013 22:08:22 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38418) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UU6B0-0006Nc-5N for qemu-devel@nongnu.org; Sun, 21 Apr 2013 22:08:18 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r3M28HOp005804 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Sun, 21 Apr 2013 22:08:17 -0400 Received: from localhost.localdomain.com ([10.66.7.14]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id r3M28COr022349; Sun, 21 Apr 2013 22:08:15 -0400 From: Fam Zheng To: qemu-devel@nongnu.org Date: Mon, 22 Apr 2013 10:07:55 +0800 Message-Id: <1366596479-22212-2-git-send-email-famz@redhat.com> In-Reply-To: <1366596479-22212-1-git-send-email-famz@redhat.com> References: <1366596479-22212-1-git-send-email-famz@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: kwolf@redhat.com, Fam Zheng , stefanha@redhat.com Subject: [Qemu-devel] [PATCH v2 1/5] vmdk: named return code. X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Internal routines in vmdk.c previously return -1 on error and 0 on success. More return values are useful for future changes such as zeroed-grain GTE. Change all the magic `return 0` and `return -1` to macro names: * VMDK_OK 0 * VMDK_ERROR (-1) * VMDK_UNALLOC (-2) * VMDK_ZEROED (-3) Signed-off-by: Fam Zheng --- block/vmdk.c | 60 ++++++++++++++++++++++++++++++++++-------------------------- 1 file changed, 34 insertions(+), 26 deletions(-) diff --git a/block/vmdk.c b/block/vmdk.c index 7bad757..16aa29c 100644 --- a/block/vmdk.c +++ b/block/vmdk.c @@ -37,6 +37,14 @@ #define VMDK4_FLAG_MARKER (1 << 17) #define VMDK4_GD_AT_END 0xffffffffffffffffULL + +/* VMDK internal error codes */ +#define VMDK_OK 0 +#define VMDK_ERROR (-1) +/* Cluster not allocated */ +#define VMDK_UNALLOC (-2) +#define VMDK_ZEROED (-3) + typedef struct { uint32_t version; uint32_t flags; @@ -578,22 +586,22 @@ static int vmdk_parse_description(const char *desc, const char *opt_name, opt_pos = strstr(desc, opt_name); if (!opt_pos) { - return -1; + return VMDK_ERROR; } /* Skip "=\"" following opt_name */ opt_pos += strlen(opt_name) + 2; if (opt_pos >= end) { - return -1; + return VMDK_ERROR; } opt_end = opt_pos; while (opt_end < end && *opt_end != '"') { opt_end++; } if (opt_end == end || buf_size < opt_end - opt_pos + 1) { - return -1; + return VMDK_ERROR; } pstrcpy(buf, opt_end - opt_pos + 1, opt_pos); - return 0; + return VMDK_OK; } /* Open an extent file and append to bs array */ @@ -772,7 +780,7 @@ static int get_whole_cluster(BlockDriverState *bs, int ret; if (!vmdk_is_cid_valid(bs)) { - return -1; + return VMDK_ERROR; } /* floor offset to cluster */ @@ -780,17 +788,17 @@ static int get_whole_cluster(BlockDriverState *bs, ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain, extent->cluster_sectors); if (ret < 0) { - return -1; + return VMDK_ERROR; } /* Write grain only into the active image */ ret = bdrv_write(extent->file, cluster_offset, whole_grain, extent->cluster_sectors); if (ret < 0) { - return -1; + return VMDK_ERROR; } } - return 0; + return VMDK_OK; } static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data) @@ -803,7 +811,7 @@ static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data) &(m_data->offset), sizeof(m_data->offset) ) < 0) { - return -1; + return VMDK_ERROR; } /* update backup L2 table */ if (extent->l1_backup_table_offset != 0) { @@ -814,11 +822,11 @@ static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data) + (m_data->l2_index * sizeof(m_data->offset)), &(m_data->offset), sizeof(m_data->offset) ) < 0) { - return -1; + return VMDK_ERROR; } } - return 0; + return VMDK_OK; } static int get_cluster_offset(BlockDriverState *bs, @@ -837,17 +845,17 @@ static int get_cluster_offset(BlockDriverState *bs, } if (extent->flat) { *cluster_offset = extent->flat_start_offset; - return 0; + return VMDK_OK; } offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE; l1_index = (offset >> 9) / extent->l1_entry_sectors; if (l1_index >= extent->l1_size) { - return -1; + return VMDK_ERROR; } l2_offset = extent->l1_table[l1_index]; if (!l2_offset) { - return -1; + return VMDK_UNALLOC; } for (i = 0; i < L2_CACHE_SIZE; i++) { if (l2_offset == extent->l2_cache_offsets[i]) { @@ -877,7 +885,7 @@ static int get_cluster_offset(BlockDriverState *bs, l2_table, extent->l2_size * sizeof(uint32_t) ) != extent->l2_size * sizeof(uint32_t)) { - return -1; + return VMDK_ERROR; } extent->l2_cache_offsets[min_index] = l2_offset; @@ -888,7 +896,7 @@ static int get_cluster_offset(BlockDriverState *bs, if (!*cluster_offset) { if (!allocate) { - return -1; + return VMDK_UNALLOC; } /* Avoid the L2 tables update for the images that have snapshots. */ @@ -911,7 +919,7 @@ static int get_cluster_offset(BlockDriverState *bs, */ if (get_whole_cluster( bs, extent, *cluster_offset, offset, allocate) == -1) { - return -1; + return VMDK_ERROR; } if (m_data) { @@ -923,7 +931,7 @@ static int get_cluster_offset(BlockDriverState *bs, } } *cluster_offset <<= 9; - return 0; + return VMDK_OK; } static VmdkExtent *find_extent(BDRVVmdkState *s, @@ -1173,7 +1181,7 @@ static int vmdk_write(BlockDriverState *bs, int64_t sector_num, sector_num << 9, !extent->compressed, &cluster_offset); if (extent->compressed) { - if (ret == 0) { + if (ret == VMDK_OK) { /* Refuse write to allocated cluster for streamOptimized */ fprintf(stderr, "VMDK: can't write to allocated cluster" @@ -1357,7 +1365,7 @@ static int filename_decompose(const char *filename, char *path, char *prefix, if (filename == NULL || !strlen(filename)) { fprintf(stderr, "Vmdk: no filename provided.\n"); - return -1; + return VMDK_ERROR; } p = strrchr(filename, '/'); if (p == NULL) { @@ -1369,7 +1377,7 @@ static int filename_decompose(const char *filename, char *path, char *prefix, if (p != NULL) { p++; if (p - filename >= buf_len) { - return -1; + return VMDK_ERROR; } pstrcpy(path, p - filename + 1, filename); } else { @@ -1382,12 +1390,12 @@ static int filename_decompose(const char *filename, char *path, char *prefix, postfix[0] = '\0'; } else { if (q - p >= buf_len) { - return -1; + return VMDK_ERROR; } pstrcpy(prefix, q - p + 1, p); pstrcpy(postfix, buf_len, q); } - return 0; + return VMDK_OK; } static int relative_path(char *dest, int dest_size, @@ -1403,11 +1411,11 @@ static int relative_path(char *dest, int dest_size, #endif if (!(dest && base && target)) { - return -1; + return VMDK_ERROR; } if (path_is_absolute(target)) { pstrcpy(dest, dest_size, target); - return 0; + return VMDK_OK; } while (base[i] == target[i]) { i++; @@ -1426,7 +1434,7 @@ static int relative_path(char *dest, int dest_size, pstrcat(dest, dest_size, sep); } pstrcat(dest, dest_size, q); - return 0; + return VMDK_OK; } static int vmdk_create(const char *filename, QEMUOptionParameter *options)