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qemu-io: add flag to mark files growable 

Add a -g flag to the open command and the main qemu-io command line to
allow opening a file growable.  This is only allowed for protocols,
mirroring the limitation exposed through bdrv_file_open.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Christoph Hellwig 2009-07-10 13:33:47 +02:00 committed by Anthony Liguori
parent cf57298af5
commit 9c4bab2668
1 changed files with 26 additions and 5 deletions
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31
qemu-io.c
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@ -1172,7 +1172,7 @@ static const cmdinfo_t close_cmd = {
.oneline = "close the current open file", .oneline = "close the current open file",
}; };
static int openfile(char *name, int flags) static int openfile(char *name, int flags, int growable)
{ {
if (bs) { if (bs) {
fprintf(stderr, "file open already, try 'help close'\n"); fprintf(stderr, "file open already, try 'help close'\n");
@ -1189,6 +1189,17 @@ static int openfile(char *name, int flags)
return 1; return 1;
} }
if (growable) {
if (!bs->drv || !bs->drv->protocol_name) {
fprintf(stderr,
"%s: only protocols can be opened growable\n",
progname);
return 1;
}
bs->growable = 1;
}
return 0; return 0;
} }
@ -1207,6 +1218,7 @@ open_help(void)
" -r, -- open file read-only\n" " -r, -- open file read-only\n"
" -s, -- use snapshot file\n" " -s, -- use snapshot file\n"
" -n, -- disable host cache\n" " -n, -- disable host cache\n"
" -g, -- allow file to grow (only applies to protocols)"
"\n"); "\n");
} }
@ -1217,9 +1229,10 @@ open_f(int argc, char **argv)
{ {
int flags = 0; int flags = 0;
int readonly = 0; int readonly = 0;
int growable = 0;
int c; int c;
while ((c = getopt(argc, argv, "snCr")) != EOF) { while ((c = getopt(argc, argv, "snCrg")) != EOF) {
switch (c) { switch (c) {
case 's': case 's':
flags |= BDRV_O_SNAPSHOT; flags |= BDRV_O_SNAPSHOT;
@ -1233,6 +1246,9 @@ open_f(int argc, char **argv)
case 'r': case 'r':
readonly = 1; readonly = 1;
break; break;
case 'g':
growable = 1;
break;
default: default:
return command_usage(&open_cmd); return command_usage(&open_cmd);
} }
@ -1246,7 +1262,7 @@ open_f(int argc, char **argv)
if (optind != argc - 1) if (optind != argc - 1)
return command_usage(&open_cmd); return command_usage(&open_cmd);
return openfile(argv[optind], flags); return openfile(argv[optind], flags, growable);
} }
static const cmdinfo_t open_cmd = { static const cmdinfo_t open_cmd = {
@ -1306,7 +1322,8 @@ static void usage(const char *name)
int main(int argc, char **argv) int main(int argc, char **argv)
{ {
int readonly = 0; int readonly = 0;
const char *sopt = "hVc:Crsnm"; int growable = 0;
const char *sopt = "hVc:Crsnmg";
struct option lopt[] = { struct option lopt[] = {
{ "help", 0, 0, 'h' }, { "help", 0, 0, 'h' },
{ "version", 0, 0, 'V' }, { "version", 0, 0, 'V' },
@ -1317,6 +1334,7 @@ int main(int argc, char **argv)
{ "snapshot", 0, 0, 's' }, { "snapshot", 0, 0, 's' },
{ "nocache", 0, 0, 'n' }, { "nocache", 0, 0, 'n' },
{ "misalign", 0, 0, 'm' }, { "misalign", 0, 0, 'm' },
{ "growable", 0, 0, 'g' },
{ NULL, 0, 0, 0 } { NULL, 0, 0, 0 }
}; };
int c; int c;
@ -1345,6 +1363,9 @@ int main(int argc, char **argv)
case 'm': case 'm':
misalign = 1; misalign = 1;
break; break;
case 'g':
growable = 1;
break;
case 'V': case 'V':
printf("%s version %s\n", progname, VERSION); printf("%s version %s\n", progname, VERSION);
exit(0); exit(0);
@ -1392,7 +1413,7 @@ int main(int argc, char **argv)
flags |= BDRV_O_RDWR; flags |= BDRV_O_RDWR;
if ((argc - optind) == 1) if ((argc - optind) == 1)
openfile(argv[optind], flags); openfile(argv[optind], flags, growable);
command_loop(); command_loop();
/* /*