Received-SPF: pass (google.com: domain of linux-ext4-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Gabriel Krisman Bertazi <krisman@suse.de>
To:     viro@zeniv.linux.org.uk, brauner@kernel.org, tytso@mit.edu,
        ebiggers@kernel.org, jaegeuk@kernel.org
Cc:     linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org,
        linux-f2fs-devel@lists.sourceforge.net,
        Gabriel Krisman Bertazi <krisman@suse.de>,
        Gabriel Krisman Bertazi <krisman@collabora.com>
Subject: [PATCH v4 2/7] fs: Add DCACHE_CASEFOLDED_NAME flag
Date:   Thu, 27 Jul 2023 13:28:38 -0400
Message-ID: <20230727172843.20542-3-krisman@suse.de>
In-Reply-To: <20230727172843.20542-1-krisman@suse.de>
References: <20230727172843.20542-1-krisman@suse.de>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Gabriel Krisman Bertazi <krisman@collabora.com>

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@mit.edu>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>

---
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);
+
 static unsigned d_flags_for_inode(struct inode *inode)
 {
 	unsigned add_flags = DCACHE_REGULAR_TYPE;
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index b6188f2e8950..14aa0255bd04 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -209,6 +209,7 @@ struct dentry_operations {
 #define DCACHE_FALLTHRU			0x01000000 /* Fall through to lower layer */
 #define DCACHE_NOKEY_NAME		0x02000000 /* Encrypted name encoded without key */
 #define DCACHE_OP_REAL			0x04000000
+#define DCACHE_CASEFOLDED_NAME		0x08000000 /* Dentry comes from a casefold directory */
 
 #define DCACHE_PAR_LOOKUP		0x10000000 /* being looked up (with parent locked shared) */
 #define DCACHE_DENTRY_CURSOR		0x20000000
@@ -497,6 +498,13 @@ static inline bool d_is_fallthru(const struct dentry *dentry)
 	return dentry->d_flags & DCACHE_FALLTHRU;
 }
 
+extern void d_set_casefold_lookup(struct dentry *dentry);
+
+static inline bool d_is_casefold_lookup(const struct dentry *dentry)
+{
+	return dentry->d_flags & DCACHE_CASEFOLDED_NAME;
+}
+
 
 extern int sysctl_vfs_cache_pressure;
 
-- 
2.41.0