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Message-Id: <20240129210631.193493-6-mathieu.desnoyers@efficios.com>
Date: Mon, 29 Jan 2024 16:06:29 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Dan Williams <dan.j.williams@...el.com>,
Vishal Verma <vishal.l.verma@...el.com>,
Dave Jiang <dave.jiang@...el.com>
Cc: linux-kernel@...r.kernel.org,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
"Theodore Ts'o" <tytso@....edu>,
Andreas Dilger <adilger.kernel@...ger.ca>,
linux-ext4@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
linux-mm@...ck.org,
linux-arch@...r.kernel.org,
Matthew Wilcox <willy@...radead.org>,
nvdimm@...ts.linux.dev,
linux-cxl@...r.kernel.org
Subject: [RFC PATCH 5/7] ext4: Use dax_is_supported()
Use dax_is_supported() to validate whether the architecture has
virtually aliased caches at mount time.
This is relevant for architectures which require a dynamic check
to validate whether they have virtually aliased data caches
(ARCH_HAS_CACHE_ALIASING_DYNAMIC=y).
Fixes: d92576f1167c ("dax: does not work correctly with virtual aliasing caches")
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: "Theodore Ts'o" <tytso@....edu>
Cc: Andreas Dilger <adilger.kernel@...ger.ca>
Cc: linux-ext4@...r.kernel.org
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-mm@...ck.org
Cc: linux-arch@...r.kernel.org
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Vishal Verma <vishal.l.verma@...el.com>
Cc: Dave Jiang <dave.jiang@...el.com>
Cc: Matthew Wilcox <willy@...radead.org>
Cc: nvdimm@...ts.linux.dev
Cc: linux-cxl@...r.kernel.org
---
fs/ext4/super.c | 52 ++++++++++++++++++++++++-------------------------
1 file changed, 25 insertions(+), 27 deletions(-)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index c5fcf377ab1f..9e0606289239 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2359,34 +2359,32 @@ static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param)
return ext4_parse_test_dummy_encryption(param, ctx);
case Opt_dax:
case Opt_dax_type:
-#ifdef CONFIG_FS_DAX
- {
- int type = (token == Opt_dax) ?
- Opt_dax : result.uint_32;
-
- switch (type) {
- case Opt_dax:
- case Opt_dax_always:
- ctx_set_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
- ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
- break;
- case Opt_dax_never:
- ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
- ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
- break;
- case Opt_dax_inode:
- ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
- ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
- /* Strictly for printing options */
- ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_INODE);
- break;
+ if (dax_is_supported()) {
+ int type = (token == Opt_dax) ?
+ Opt_dax : result.uint_32;
+
+ switch (type) {
+ case Opt_dax:
+ case Opt_dax_always:
+ ctx_set_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
+ ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
+ break;
+ case Opt_dax_never:
+ ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
+ ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
+ break;
+ case Opt_dax_inode:
+ ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
+ ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
+ /* Strictly for printing options */
+ ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_INODE);
+ break;
+ }
+ return 0;
+ } else {
+ ext4_msg(NULL, KERN_INFO, "dax option not supported");
+ return -EINVAL;
}
- return 0;
- }
-#else
- ext4_msg(NULL, KERN_INFO, "dax option not supported");
- return -EINVAL;
-#endif
case Opt_data_err:
if (result.uint_32 == Opt_data_err_abort)
ctx_set_mount_opt(ctx, m->mount_opt);
--
2.39.2
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