From f2a322f995adfd0dea4f744fb942b9f933527d74 Mon Sep 17 00:00:00 2001 Message-Id: In-Reply-To: References: From: Jeffrey Cody Date: Wed, 3 Dec 2014 20:00:42 -0600 Subject: [CHANGE 05/12] block: vpc - use block layer ops in vpc_create, instead of posix calls To: rhvirt-patches@redhat.com, jen@redhat.com RH-Author: Jeffrey Cody Message-id: Patchwork-id: 62664 O-Subject: [PATCH qemu-kvm-rhev RHEV7.1 v2 4/7] block: vpc - use block layer ops in vpc_create, instead of posix calls Bugzilla: 1136381 RH-Acked-by: Markus Armbruster RH-Acked-by: Max Reitz RH-Acked-by: Fam Zheng RH-Acked-by: John Snow Use the block layer to create, and write to, the image file in the VPC .bdrv_create() operation. This has a couple of benefits: Images can now be created over protocols, and hacks such as NOCOW are not needed in the image format driver, and the underlying file protocol appropriate for the host OS can be relied upon. Reviewed-by: Max Reitz Signed-off-by: Jeff Cody Signed-off-by: Kevin Wolf (cherry picked from commit fef6070eff233400015cede968b0afe46c80bb0f) Signed-off-by: Jeff E. Nelson --- block/vpc.c | 106 ++++++++++++++++++++++++------------------------------------ 1 file changed, 43 insertions(+), 63 deletions(-) diff --git a/block/vpc.c b/block/vpc.c index 8b376a4..9690344 100644 --- a/block/vpc.c +++ b/block/vpc.c @@ -29,13 +29,6 @@ #if defined(CONFIG_UUID) #include #endif -#ifdef __linux__ -#include -#include -#ifndef FS_NOCOW_FL -#define FS_NOCOW_FL 0x00800000 /* Do not cow file */ -#endif -#endif /**************************************************************/ @@ -656,39 +649,41 @@ static int calculate_geometry(int64_t total_sectors, uint16_t* cyls, return 0; } -static int create_dynamic_disk(int fd, uint8_t *buf, int64_t total_sectors) +static int create_dynamic_disk(BlockDriverState *bs, uint8_t *buf, + int64_t total_sectors) { VHDDynDiskHeader *dyndisk_header = (VHDDynDiskHeader *) buf; size_t block_size, num_bat_entries; int i; - int ret = -EIO; + int ret; + int64_t offset = 0; // Write the footer (twice: at the beginning and at the end) block_size = 0x200000; num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512); - if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) { + ret = bdrv_pwrite_sync(bs, offset, buf, HEADER_SIZE); + if (ret) { goto fail; } - if (lseek(fd, 1536 + ((num_bat_entries * 4 + 511) & ~511), SEEK_SET) < 0) { - goto fail; - } - if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) { + offset = 1536 + ((num_bat_entries * 4 + 511) & ~511); + ret = bdrv_pwrite_sync(bs, offset, buf, HEADER_SIZE); + if (ret < 0) { goto fail; } // Write the initial BAT - if (lseek(fd, 3 * 512, SEEK_SET) < 0) { - goto fail; - } + offset = 3 * 512; memset(buf, 0xFF, 512); for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) { - if (write(fd, buf, 512) != 512) { + ret = bdrv_pwrite_sync(bs, offset, buf, 512); + if (ret < 0) { goto fail; } + offset += 512; } // Prepare the Dynamic Disk Header @@ -709,39 +704,35 @@ static int create_dynamic_disk(int fd, uint8_t *buf, int64_t total_sectors) dyndisk_header->checksum = be32_to_cpu(vpc_checksum(buf, 1024)); // Write the header - if (lseek(fd, 512, SEEK_SET) < 0) { - goto fail; - } + offset = 512; - if (write(fd, buf, 1024) != 1024) { + ret = bdrv_pwrite_sync(bs, offset, buf, 1024); + if (ret < 0) { goto fail; } - ret = 0; fail: return ret; } -static int create_fixed_disk(int fd, uint8_t *buf, int64_t total_size) +static int create_fixed_disk(BlockDriverState *bs, uint8_t *buf, + int64_t total_size) { - int ret = -EIO; + int ret; /* Add footer to total size */ - total_size += 512; - if (ftruncate(fd, total_size) != 0) { - ret = -errno; - goto fail; - } - if (lseek(fd, -512, SEEK_END) < 0) { - goto fail; - } - if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) { - goto fail; + total_size += HEADER_SIZE; + + ret = bdrv_truncate(bs, total_size); + if (ret < 0) { + return ret; } - ret = 0; + ret = bdrv_pwrite_sync(bs, total_size - HEADER_SIZE, buf, HEADER_SIZE); + if (ret < 0) { + return ret; + } - fail: return ret; } @@ -750,7 +741,7 @@ static int vpc_create(const char *filename, QemuOpts *opts, Error **errp) uint8_t buf[1024]; VHDFooter *footer = (VHDFooter *) buf; char *disk_type_param; - int fd, i; + int i; uint16_t cyls = 0; uint8_t heads = 0; uint8_t secs_per_cyl = 0; @@ -758,7 +749,8 @@ static int vpc_create(const char *filename, QemuOpts *opts, Error **errp) int64_t total_size; int disk_type; int ret = -EIO; - bool nocow = false; + Error *local_err = NULL; + BlockDriverState *bs = NULL; /* Read out options */ total_size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0); @@ -775,28 +767,17 @@ static int vpc_create(const char *filename, QemuOpts *opts, Error **errp) } else { disk_type = VHD_DYNAMIC; } - nocow = qemu_opt_get_bool_del(opts, BLOCK_OPT_NOCOW, false); - /* Create the file */ - fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644); - if (fd < 0) { - ret = -EIO; + ret = bdrv_create_file(filename, opts, &local_err); + if (ret < 0) { + error_propagate(errp, local_err); goto out; } - - if (nocow) { -#ifdef __linux__ - /* Set NOCOW flag to solve performance issue on fs like btrfs. - * This is an optimisation. The FS_IOC_SETFLAGS ioctl return value will - * be ignored since any failure of this operation should not block the - * left work. - */ - int attr; - if (ioctl(fd, FS_IOC_GETFLAGS, &attr) == 0) { - attr |= FS_NOCOW_FL; - ioctl(fd, FS_IOC_SETFLAGS, &attr); - } -#endif + ret = bdrv_open(&bs, filename, NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL, + NULL, &local_err); + if (ret < 0) { + error_propagate(errp, local_err); + goto out; } /* @@ -810,7 +791,7 @@ static int vpc_create(const char *filename, QemuOpts *opts, Error **errp) &secs_per_cyl)) { ret = -EFBIG; - goto fail; + goto out; } } @@ -856,14 +837,13 @@ static int vpc_create(const char *filename, QemuOpts *opts, Error **errp) footer->checksum = be32_to_cpu(vpc_checksum(buf, HEADER_SIZE)); if (disk_type == VHD_DYNAMIC) { - ret = create_dynamic_disk(fd, buf, total_sectors); + ret = create_dynamic_disk(bs, buf, total_sectors); } else { - ret = create_fixed_disk(fd, buf, total_size); + ret = create_fixed_disk(bs, buf, total_size); } -fail: - qemu_close(fd); out: + bdrv_unref(bs); g_free(disk_type_param); return ret; } -- 2.1.0