[PATCH v6 9/9] f2fs: Enable negative dentries on case-insensitive lookup

Gabriel Krisman Bertazi
2023-08-16T05:09:17Z

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

Instead of invalidating negative dentries during case-insensitive
lookups, mark them as such and let them be added to the dcache.
d_ci_revalidate is able to properly filter them out if necessary based
on the dentry casefold flag.

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

---
Changes since v5:
- Use IS_CASEFOLDED directly (eric)
Changes since v4:
- Use helper to decide if should set dentry flag.

Changes since v2:
- Move dentry flag set closer to fscrypt code (Eric)
---
fs/f2fs/namei.c | 25 ++++---------------------
1 file changed, 4 insertions(+), 21 deletions(-)

diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index bee0568888da..bf026ea2f220 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -533,6 +533,10 @@ static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,

err = f2fs_prepare_lookup(dir, dentry, &fname);
generic_set_encrypted_ci_d_ops(dentry);
+
+ if (IS_CASEFOLDED(dir))
+ d_set_casefolded_name(dentry);
+
if (err == -ENOENT)
goto out_splice;
if (err)
@@ -578,17 +582,6 @@ static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
goto out_iput;
}
out_splice:
-#if IS_ENABLED(CONFIG_UNICODE)
- if (!inode && IS_CASEFOLDED(dir)) {
- /* Eventually we want to call d_add_ci(dentry, NULL)
- * for negative dentries in the encoding case as
- * well. For now, prevent the negative dentry
- * from being cached.
- */
- trace_f2fs_lookup_end(dir, dentry, ino, err);
- return NULL;
- }
-#endif
new = d_splice_alias(inode, dentry);
trace_f2fs_lookup_end(dir, !IS_ERR_OR_NULL(new) ? new : dentry,
ino, IS_ERR(new) ? PTR_ERR(new) : err);
@@ -641,16 +634,6 @@ static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
f2fs_delete_entry(de, page, dir, inode);
f2fs_unlock_op(sbi);

-#if IS_ENABLED(CONFIG_UNICODE)
- /* VFS negative dentries are incompatible with Encoding and
- * Case-insensitiveness. Eventually we'll want avoid
- * invalidating the dentries here, alongside with returning the
- * negative dentries at f2fs_lookup(), when it is better
- * supported by the VFS for the CI case.
- */
- if (IS_CASEFOLDED(dir))
- d_invalidate(dentry);
-#endif
if (IS_DIRSYNC(dir))
f2fs_sync_fs(sbi->sb, 1);
fail:
--
2.41.0