diff mbox series

[v5,05/10] fs: Add DCACHE_CASEFOLDED_NAME flag

Message ID 20230812004146.30980-6-krisman@suse.de (mailing list archive)
State New, archived
Headers show
Series Support negative dentries on case-insensitive ext4 and f2fs | expand

Commit Message

Gabriel Krisman Bertazi Aug. 12, 2023, 12:41 a.m. UTC 
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 v4:
  - Fixup names of functions to reflect flag name change (Eric)

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(+)

Comments

Eric Biggers Aug. 12, 2023, 2:17 a.m. UTC | #1 
On Fri, Aug 11, 2023 at 08:41:41PM -0400, Gabriel Krisman Bertazi wrote:
> +void d_set_casefolded_name(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);

s/d_set_casefold_lookup/d_set_casefolded_name/

- Eric
Gabriel Krisman Bertazi Aug. 14, 2023, 3:03 p.m. UTC | #2 
Eric Biggers <ebiggers@kernel.org> writes:

> On Fri, Aug 11, 2023 at 08:41:41PM -0400, Gabriel Krisman Bertazi wrote:
>> +void d_set_casefolded_name(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);
>
> s/d_set_casefold_lookup/d_set_casefolded_name/

My apologies for this error again.  It sucks there is no compile-time
warning for EXPORT_SYMBOL, but I should have caught it in the past two
iterations.  Will fix.
diff mbox series

Patch

diff --git a/fs/dcache.c b/fs/dcache.c
index 52e6d5fdab6b..269367c1a86c 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_casefolded_name(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 9362e4ef0bad..ccbb5c4db7ce 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -208,6 +208,7 @@  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
@@ -496,6 +497,13 @@  static inline bool d_is_fallthru(const struct dentry *dentry)
 	return dentry->d_flags & DCACHE_FALLTHRU;
 }
 
+extern void d_set_casefolded_name(struct dentry *dentry);
+
+static inline bool d_is_casefolded_name(const struct dentry *dentry)
+{
+	return dentry->d_flags & DCACHE_CASEFOLDED_NAME;
+}
+
 
 extern int sysctl_vfs_cache_pressure;