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blkdebug: Make required alignment configurable

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The new 'align' option of blkdebug can be used in order to emulate
backends with a required 4k alignment on hosts which only really require
512 byte alignment.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2014-01-14 13:44:35 +01:00
parent 2c9880c45e
commit b35ee7fb23
2 changed files with 19 additions and 0 deletions
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16
block/blkdebug.c
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@ -364,6 +364,11 @@ static QemuOptsList runtime_opts = {
.type = QEMU_OPT_STRING,
.help = "[internal use only, will be removed]",
},
{
.name = "align",
.type = QEMU_OPT_SIZE,
.help = "Required alignment in bytes",
},
{ /* end of list */ }
},
};
@ -375,6 +380,7 @@ static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags,
QemuOpts *opts;
Error *local_err = NULL;
const char *config;
uint64_t align;
int ret;
opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
@ -403,6 +409,16 @@ static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags,
goto fail;
}
/* Set request alignment */
align = qemu_opt_get_size(opts, "align", bs->request_alignment);
if (align > 0 && align < INT_MAX && !(align & (align - 1))) {
bs->request_alignment = align;
} else {
error_setg(errp, "Invalid alignment");
ret = -EINVAL;
goto fail;
}
ret = 0;
fail:
qemu_opts_del(opts);