diff mbox series

[v6,6/9] virtio: Treat alloc_dax() -EOPNOTSUPP failure as non-fatal

Message ID 20240215144633.96437-7-mathieu.desnoyers@efficios.com (mailing list archive)
State New
Headers show
Series Introduce cpu_dcache_is_aliasing() to fix DAX regression | expand

Commit Message

Mathieu Desnoyers Feb. 15, 2024, 2:46 p.m. UTC
In preparation for checking whether the architecture has data cache
aliasing within alloc_dax(), modify the error handling of virtio
virtio_fs_setup_dax() to treat alloc_dax() -EOPNOTSUPP failure as

Co-developed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Fixes: d92576f1167c ("dax: does not work correctly with virtual aliasing caches")
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Alasdair Kergon <agk@redhat.com>
Cc: Mike Snitzer <snitzer@kernel.org>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Russell King <linux@armlinux.org.uk>
Cc: linux-arch@vger.kernel.org
Cc: linux-cxl@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-mm@kvack.org
Cc: linux-xfs@vger.kernel.org
Cc: dm-devel@lists.linux.dev
Cc: nvdimm@lists.linux.dev
 fs/fuse/virtio_fs.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)
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diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index 5f1be1da92ce..a28466c2da71 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -16,6 +16,7 @@ 
 #include <linux/fs_context.h>
 #include <linux/fs_parser.h>
 #include <linux/highmem.h>
+#include <linux/cleanup.h>
 #include <linux/uio.h>
 #include "fuse_i.h"
@@ -795,8 +796,11 @@  static void virtio_fs_cleanup_dax(void *data)
+DEFINE_FREE(cleanup_dax, struct dax_dev *, if (!IS_ERR_OR_NULL(_T)) virtio_fs_cleanup_dax(_T))
 static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs)
+	struct dax_device *dax_dev __free(cleanup_dax) = NULL;
 	struct virtio_shm_region cache_reg;
 	struct dev_pagemap *pgmap;
 	bool have_cache;
@@ -804,6 +808,12 @@  static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs)
 		return 0;
+	dax_dev = alloc_dax(fs, &virtio_fs_dax_ops);
+	if (IS_ERR(dax_dev)) {
+		int rc = PTR_ERR(dax_dev);
+		return rc == -EOPNOTSUPP ? 0 : rc;
+	}
 	/* Get cache region */
 	have_cache = virtio_get_shm_region(vdev, &cache_reg,
@@ -849,10 +859,7 @@  static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs)
 	dev_dbg(&vdev->dev, "%s: window kaddr 0x%px phys_addr 0x%llx len 0x%llx\n",
 		__func__, fs->window_kaddr, cache_reg.addr, cache_reg.len);
-	fs->dax_dev = alloc_dax(fs, &virtio_fs_dax_ops);
-	if (IS_ERR(fs->dax_dev))
-		return PTR_ERR(fs->dax_dev);
+	fs->dax_dev = no_free_ptr(dax_dev);
 	return devm_add_action_or_reset(&vdev->dev, virtio_fs_cleanup_dax,