[PATCH] hostfs: Add const qualifier to host_root in hostfs_fill_super()

[PATCH] hostfs: Add const qualifier to host_root in hostfs_fill_super()

[Nathan Chancellor]

After the recent conversion to the new mount API, there is a warning
when building hostfs (which may be upgraded to an error via
CONFIG_WERROR=y):

  fs/hostfs/hostfs_kern.c: In function 'hostfs_fill_super':
  fs/hostfs/hostfs_kern.c:942:27: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
    942 |         char *host_root = fc->source;
        |                           ^~

Add the 'const' qualifier, as host_root will not be modified after its
assignment. Move the assignment to keep the existing reverse Christmas
tree order intact.

Fixes: cd140ce9f611 ("hostfs: convert hostfs to use the new mount API")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
---
 fs/hostfs/hostfs_kern.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 6ec3c368d7bf..e44747bbfe87 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -938,8 +938,8 @@ static const struct inode_operations hostfs_link_iops = {
 static int hostfs_fill_super(struct super_block *sb, struct fs_context *fc)
 {
 	struct hostfs_fs_info *fsi = sb->s_fs_info;
+	const char *host_root = fc->source;
 	struct inode *root_inode;
-	char *host_root = fc->source;
 	int err;
 
 	sb->s_blocksize = 1024;

---
base-commit: cd140ce9f611a5e9d2a5989a282b75e55c71dab3
change-id: 20240611-hostfs-fix-mount-api-conversion-83eda29c74fe

Best regards,
-- 
Nathan Chancellor <nathan@kernel.org>

Re: [PATCH] hostfs: Add const qualifier to host_root in hostfs_fill_super()

[Richard Weinberger]

----- Ursprüngliche Mail -----
> Von: "Nathan Chancellor" <nathan@kernel.org>
> An: "Christian Brauner" <brauner@kernel.org>
> CC: "Hongbo Li" <lihongbo22@huawei.com>, "richard" <richard@nod.at>, "anton ivanov" <anton.ivanov@cambridgegreys.com>,
> "Johannes Berg" <johannes@sipsolutions.net>, "linux-um" <linux-um@lists.infradead.org>, "linux-kernel"
> <linux-kernel@vger.kernel.org>, "Nathan Chancellor" <nathan@kernel.org>
> Gesendet: Dienstag, 11. Juni 2024 21:58:41
> Betreff: [PATCH] hostfs: Add const qualifier to host_root in hostfs_fill_super()

> After the recent conversion to the new mount API, there is a warning
> when building hostfs (which may be upgraded to an error via
> CONFIG_WERROR=y):
> 
>  fs/hostfs/hostfs_kern.c: In function 'hostfs_fill_super':
>  fs/hostfs/hostfs_kern.c:942:27: warning: initialization discards 'const'
>  qualifier from pointer target type [-Wdiscarded-qualifiers]
>    942 |         char *host_root = fc->source;
>        |                           ^~
> 
> Add the 'const' qualifier, as host_root will not be modified after its
> assignment. Move the assignment to keep the existing reverse Christmas
> tree order intact.
> 
> Fixes: cd140ce9f611 ("hostfs: convert hostfs to use the new mount API")
> Signed-off-by: Nathan Chancellor <nathan@kernel.org>

Acked-by: Richard Weinberger <richard@nod.at>

Thanks,
//richard

Re: [PATCH] hostfs: Add const qualifier to host_root in hostfs_fill_super()

[Christian Brauner]

On Tue, 11 Jun 2024 12:58:41 -0700, Nathan Chancellor wrote:
> After the recent conversion to the new mount API, there is a warning
> when building hostfs (which may be upgraded to an error via
> CONFIG_WERROR=y):
> 
>   fs/hostfs/hostfs_kern.c: In function 'hostfs_fill_super':
>   fs/hostfs/hostfs_kern.c:942:27: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
>     942 |         char *host_root = fc->source;
>         |                           ^~
> 
> [...]

Applied to the vfs.mount.api branch of the vfs/vfs.git tree.
Patches in the vfs.mount.api branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.mount.api

[1/1] hostfs: Add const qualifier to host_root in hostfs_fill_super()
      https://git.kernel.org/vfs/vfs/c/104eef133fd9