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rbd: don't establish watch for read-only mappings 

With exclusive lock out of the way, watch is the only thing left that
prevents a read-only mapping from being used with read-only OSD caps.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
Reviewed-by: Dongsheng Yang <dongsheng.yang@easystack.cn>
alistair/sunxi64-5.5-dsi
Ilya Dryomov 2019-11-12 20:20:04 +01:00
parent 3fe69921db
commit b9ef2b8858
1 changed files with 27 additions and 14 deletions
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41
drivers/block/rbd.c
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@ -6961,6 +6961,24 @@ static int rbd_dev_header_name(struct rbd_device *rbd_dev)
return ret;
}
static void rbd_print_dne(struct rbd_device *rbd_dev, bool is_snap)
{
if (!is_snap) {
pr_info("image %s/%s%s%s does not exist\n",
rbd_dev->spec->pool_name,
rbd_dev->spec->pool_ns ?: "",
rbd_dev->spec->pool_ns ? "/" : "",
rbd_dev->spec->image_name);
} else {
pr_info("snap %s/%s%s%s@%s does not exist\n",
rbd_dev->spec->pool_name,
rbd_dev->spec->pool_ns ?: "",
rbd_dev->spec->pool_ns ? "/" : "",
rbd_dev->spec->image_name,
rbd_dev->spec->snap_name);
}
}
static void rbd_dev_image_release(struct rbd_device *rbd_dev)
{
rbd_dev_unprobe(rbd_dev);
@ -6979,6 +6997,7 @@ static void rbd_dev_image_release(struct rbd_device *rbd_dev)
*/
static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth)
{
bool need_watch = !rbd_is_ro(rbd_dev);
int ret;
/*
@ -6995,22 +7014,21 @@ static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth)
if (ret)
goto err_out_format;
if (!depth) {
if (need_watch) {
ret = rbd_register_watch(rbd_dev);
if (ret) {
if (ret == -ENOENT)
pr_info("image %s/%s%s%s does not exist\n",
rbd_dev->spec->pool_name,
rbd_dev->spec->pool_ns ?: "",
rbd_dev->spec->pool_ns ? "/" : "",
rbd_dev->spec->image_name);
rbd_print_dne(rbd_dev, false);
goto err_out_format;
}
}
ret = rbd_dev_header_info(rbd_dev);
if (ret)
if (ret) {
if (ret == -ENOENT && !need_watch)
rbd_print_dne(rbd_dev, false);
goto err_out_watch;
}
/*
* If this image is the one being mapped, we have pool name and
@ -7024,12 +7042,7 @@ static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth)
ret = rbd_spec_fill_names(rbd_dev);
if (ret) {
if (ret == -ENOENT)
pr_info("snap %s/%s%s%s@%s does not exist\n",
rbd_dev->spec->pool_name,
rbd_dev->spec->pool_ns ?: "",
rbd_dev->spec->pool_ns ? "/" : "",
rbd_dev->spec->image_name,
rbd_dev->spec->snap_name);
rbd_print_dne(rbd_dev, true);
goto err_out_probe;
}
@ -7061,7 +7074,7 @@ static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth)
err_out_probe:
rbd_dev_unprobe(rbd_dev);
err_out_watch:
if (!depth)
if (need_watch)
rbd_unregister_watch(rbd_dev);
err_out_format:
rbd_dev->image_format = 0;