On Thu, Jul 27, 2023 at 01:28:38PM -0400, Gabriel Krisman Bertazi wrote:
> From: Gabriel Krisman Bertazi <krisman@xxxxxxxxxxxxx>
>
> This flag marks a negative or positive dentry as being created after a
> case-insensitive lookup operation. It is useful to differentiate
> dentries this way to detect whether the negative dentry can be trusted
> during a case-insensitive lookup.
>
> Reviewed-by: Theodore Ts'o <tytso@xxxxxxx>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@xxxxxxxxxxxxx>
>
> ---
> Changes since v2:
> - Rename DCACHE_CASEFOLD_LOOKUP -> DCACHE_CASEFOLDED_NAME (Eric)
> ---
> fs/dcache.c | 8 ++++++++
> include/linux/dcache.h | 8 ++++++++
> 2 files changed, 16 insertions(+)
>
> diff --git a/fs/dcache.c b/fs/dcache.c
> index 98521862e58a..5791489b589f 100644
> --- a/fs/dcache.c
> +++ b/fs/dcache.c
> @@ -1958,6 +1958,14 @@ void d_set_fallthru(struct dentry *dentry)
> }
> EXPORT_SYMBOL(d_set_fallthru);
>
> +void d_set_casefold_lookup(struct dentry *dentry)
> +{
> + spin_lock(&dentry->d_lock);
> + dentry->d_flags |= DCACHE_CASEFOLDED_NAME;
> + spin_unlock(&dentry->d_lock);
> +}
> +EXPORT_SYMBOL(d_set_casefold_lookup);
d_set_casefolded_name()
> +static inline bool d_is_casefold_lookup(const struct dentry *dentry)
> +{
> + return dentry->d_flags & DCACHE_CASEFOLDED_NAME;
> +}
d_is_casefolded_name(). Or even better, just write 'dentry->d_flags &
DCACHE_CASEFOLDED_NAME' directly in the one place that actually needs this?
- Eric
