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rnbd: use scoped_with_init_fs() for block device open

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Use scoped_with_init_fs() to temporarily override current->fs for
the bdev_file_open_by_path() call so the path lookup happens in
init's filesystem context.

process_msg_open() ← rnbd_srv_rdma_ev() ← RDMA completion callback ←
ib_cq_poll_work() ← kworker (InfiniBand completion workqueue)

Link: https://patch.msgid.link/20260601-work-kthread-nullfs-v4-6-77ee053060e0@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2026-06-01 15:56:39 +02:00
parent 9a8e296958
commit 2626320e31
1 changed files with 3 additions and 1 deletions
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4
drivers/block/rnbd/rnbd-srv.c
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@@ -11,6 +11,7 @@
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/fs_struct.h>
#include "rnbd-srv.h"
#include "rnbd-srv-trace.h"
@@ -734,7 +735,8 @@ static int process_msg_open(struct rnbd_srv_session *srv_sess,
goto reject;
}
bdev_file = bdev_file_open_by_path(full_path, open_flags, NULL, NULL);
scoped_with_init_fs()
bdev_file = bdev_file_open_by_path(full_path, open_flags, NULL, NULL);
if (IS_ERR(bdev_file)) {
ret = PTR_ERR(bdev_file);
pr_err("Opening device '%s' on session %s failed, failed to open the block device, err: %pe\n",