Re: [Qemu-devel] [PATCH v2 2/2] block: kill BDRV_O_CREAT

[Christoph Hellwig <hch@lst.de>]

Anthony, any reason you didn't pick this one up?  Is the -C option
important enough to reimplement is using bdrv_create?


On Wed, Jan 20, 2010 at 06:13:42PM +0100, Christoph Hellwig wrote:
> The BDRV_O_CREAT option is unused inside qemu and partially duplicates
> the bdrv_create method.  Remove it, and the -C option to qemu-io which
> isn't used in qemu-iotests anyway.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> 
> Index: qemu/block.h
> ===================================================================
> --- qemu.orig/block.h	2010-01-20 17:59:51.890004764 +0100
> +++ qemu/block.h	2010-01-20 18:10:42.077256041 +0100
> @@ -28,7 +28,6 @@ typedef struct QEMUSnapshotInfo {
>  } QEMUSnapshotInfo;
>  
>  #define BDRV_O_RDWR        0x0002
> -#define BDRV_O_CREAT       0x0004 /* create an empty file */
>  #define BDRV_O_SNAPSHOT    0x0008 /* open the file read only and save writes in a snapshot */
>  #define BDRV_O_FILE        0x0010 /* open as a raw file (do not try to
>                                       use a disk image format on top of
> Index: qemu/block/nbd.c
> ===================================================================
> --- qemu.orig/block/nbd.c	2010-01-20 17:43:11.456004048 +0100
> +++ qemu/block/nbd.c	2010-01-20 18:09:38.781003541 +0100
> @@ -49,9 +49,6 @@ static int nbd_open(BlockDriverState *bs
>      size_t blocksize;
>      int ret;
>  
> -    if ((flags & BDRV_O_CREAT))
> -        return -EINVAL;
> -
>      if (!strstart(filename, "nbd:", &host))
>          return -EINVAL;
>  
> Index: qemu/block/raw-posix.c
> ===================================================================
> --- qemu.orig/block/raw-posix.c	2010-01-20 17:43:11.463004312 +0100
> +++ qemu/block/raw-posix.c	2010-01-20 18:09:38.782004157 +0100
> @@ -205,13 +205,9 @@ out_close:
>  static int raw_open(BlockDriverState *bs, const char *filename, int flags)
>  {
>      BDRVRawState *s = bs->opaque;
> -    int open_flags = 0;
>  
>      s->type = FTYPE_FILE;
> -    if (flags & BDRV_O_CREAT)
> -        open_flags = O_CREAT | O_TRUNC;
> -
> -    return raw_open_common(bs, filename, flags, open_flags);
> +    return raw_open_common(bs, filename, flags, 0);
>  }
>  
>  /* XXX: use host sector size if necessary with:
> Index: qemu/block/raw-win32.c
> ===================================================================
> --- qemu.orig/block/raw-win32.c	2010-01-20 17:43:11.471022722 +0100
> +++ qemu/block/raw-win32.c	2010-01-20 18:09:38.782004157 +0100
> @@ -76,7 +76,7 @@ static int set_sparse(int fd)
>  static int raw_open(BlockDriverState *bs, const char *filename, int flags)
>  {
>      BDRVRawState *s = bs->opaque;
> -    int access_flags, create_flags;
> +    int access_flags;
>      DWORD overlapped;
>  
>      s->type = FTYPE_FILE;
> @@ -86,11 +86,7 @@ static int raw_open(BlockDriverState *bs
>      } else {
>          access_flags = GENERIC_READ;
>      }
> -    if (flags & BDRV_O_CREAT) {
> -        create_flags = CREATE_ALWAYS;
> -    } else {
> -        create_flags = OPEN_EXISTING;
> -    }
> +
>      overlapped = FILE_ATTRIBUTE_NORMAL;
>      if ((flags & BDRV_O_NOCACHE))
>          overlapped |= FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH;
> @@ -98,7 +94,7 @@ static int raw_open(BlockDriverState *bs
>          overlapped |= FILE_FLAG_WRITE_THROUGH;
>      s->hfile = CreateFile(filename, access_flags,
>                            FILE_SHARE_READ, NULL,
> -                          create_flags, overlapped, NULL);
> +                          OPEN_EXISTING, overlapped, NULL);
>      if (s->hfile == INVALID_HANDLE_VALUE) {
>          int err = GetLastError();
>  
> Index: qemu/qemu-io.c
> ===================================================================
> --- qemu.orig/qemu-io.c	2010-01-20 17:43:11.478254090 +0100
> +++ qemu/qemu-io.c	2010-01-20 18:09:38.783003935 +0100
> @@ -1307,7 +1307,6 @@ open_help(void)
>  " 'open -Cn /tmp/data' - creates/opens data file read-write and uncached\n"
>  "\n"
>  " Opens a file for subsequent use by all of the other qemu-io commands.\n"
> -" -C, -- create new file if it doesn't exist\n"
>  " -r, -- open file read-only\n"
>  " -s, -- use snapshot file\n"
>  " -n, -- disable host cache\n"
> @@ -1337,7 +1336,7 @@ open_f(int argc, char **argv)
>  	int growable = 0;
>  	int c;
>  
> -	while ((c = getopt(argc, argv, "snCrg")) != EOF) {
> +	while ((c = getopt(argc, argv, "snrg")) != EOF) {
>  		switch (c) {
>  		case 's':
>  			flags |= BDRV_O_SNAPSHOT;
> @@ -1345,9 +1344,6 @@ open_f(int argc, char **argv)
>  		case 'n':
>  			flags |= BDRV_O_NOCACHE;
>  			break;
> -		case 'C':
> -			flags |= BDRV_O_CREAT;
> -			break;
>  		case 'r':
>  			readonly = 1;
>  			break;
> @@ -1395,10 +1391,9 @@ init_check_command(
>  static void usage(const char *name)
>  {
>  	printf(
> -"Usage: %s [-h] [-V] [-Crsnm] [-c cmd] ... [file]\n"
> +"Usage: %s [-h] [-V] [-rsnm] [-c cmd] ... [file]\n"
>  "QEMU Disk exerciser\n"
>  "\n"
> -"  -C, --create         create new file if it doesn't exist\n"
>  "  -c, --cmd            command to execute\n"
>  "  -r, --read-only      export read-only\n"
>  "  -s, --snapshot       use snapshot file\n"
> @@ -1417,13 +1412,12 @@ int main(int argc, char **argv)
>  {
>  	int readonly = 0;
>  	int growable = 0;
> -	const char *sopt = "hVc:Crsnmgk";
> +	const char *sopt = "hVc:rsnmgk";
>          const struct option lopt[] = {
>  		{ "help", 0, NULL, 'h' },
>  		{ "version", 0, NULL, 'V' },
>  		{ "offset", 1, NULL, 'o' },
>  		{ "cmd", 1, NULL, 'c' },
> -		{ "create", 0, NULL, 'C' },
>  		{ "read-only", 0, NULL, 'r' },
>  		{ "snapshot", 0, NULL, 's' },
>  		{ "nocache", 0, NULL, 'n' },
> @@ -1449,9 +1443,6 @@ int main(int argc, char **argv)
>  		case 'c':
>  			add_user_command(optarg);
>  			break;
> -		case 'C':
> -			flags |= BDRV_O_CREAT;
> -			break;
>  		case 'r':
>  			readonly = 1;
>  			break;
> 
---end quoted text---