Use dax_is_supported() to validate whether the architecture has
virtually aliased data caches at mount time. Print an error and disable
DAX if dax=always is requested as a mount option on an architecture
which does not support DAX.
This is relevant for architectures which require a dynamic check
to validate whether they have virtually aliased data caches.
Fixes: d92576f1167c ("dax: does not work correctly with virtual aliasing
caches")
Signed-off-by: Mathieu Desnoyers <[email protected]>
Cc: Gao Xiang <[email protected]>
Cc: Chao Yu <[email protected]>
Cc: Yue Hu <[email protected]>
Cc: Jeffle Xu <[email protected]>
Cc: [email protected]
Cc: Andrew Morton <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Dan Williams <[email protected]>
Cc: Vishal Verma <[email protected]>
Cc: Dave Jiang <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Russell King <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
---
fs/erofs/super.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index 3789d6224513..82e569bd5889 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -644,7 +644,10 @@ static int erofs_fc_fill_super(struct super_block *sb,
struct fs_context *fc)
}
if (test_opt(&sbi->opt, DAX_ALWAYS)) {
- if (!sbi->dax_dev) {
+ if (!dax_is_supported()) {
+ errorfc(fc, "DAX unsupported by architecture. Turning
off DAX.");
+ clear_opt(&sbi->opt, DAX_ALWAYS);
+ } else if (!sbi->dax_dev) {
errorfc(fc, "DAX unsupported by block device. Turning
off DAX.");
clear_opt(&sbi->opt, DAX_ALWAYS);
} else if (sbi->blkszbits != PAGE_SHIFT) {
--
2.39.2
