[PATCH v6 7/9] libfs: Merge encrypted_ci_dentry_ops and ci_dentry_ops

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

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

Now that casefold needs d_revalidate and calls fscrypt_d_revalidate
itself, generic_encrypt_ci_dentry_ops and generic_ci_dentry_ops are now
equivalent. Merge them together and simplify the setup code.

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

---
changes since v2:
- reword comment for clarity (Eric)
---
fs/libfs.c | 45 +++++++++++++--------------------------------
1 file changed, 13 insertions(+), 32 deletions(-)

diff --git a/fs/libfs.c b/fs/libfs.c
index 994e4c98ec07..e7a44a2be0ee 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -1523,7 +1523,7 @@ static int generic_ci_d_revalidate(struct dentry *dentry,
return fscrypt_d_revalidate(dentry, name, flags);
}

-static const struct dentry_operations generic_ci_dentry_ops = {
+static const struct dentry_operations generic_encrypted_ci_dentry_ops = {
.d_hash = generic_ci_d_hash,
.d_compare = generic_ci_d_compare,
.d_revalidate = generic_ci_d_revalidate,
@@ -1536,26 +1536,19 @@ static const struct dentry_operations generic_encrypted_dentry_ops = {
};
#endif

-#if defined(CONFIG_FS_ENCRYPTION) && IS_ENABLED(CONFIG_UNICODE)
-static const struct dentry_operations generic_encrypted_ci_dentry_ops = {
- .d_hash = generic_ci_d_hash,
- .d_compare = generic_ci_d_compare,
- .d_revalidate = generic_ci_d_revalidate,
-};
-#endif
-
/**
* generic_set_encrypted_ci_d_ops - helper for setting d_ops for given dentry
* @dentry: dentry to set ops on
*
- * Casefolded directories need d_hash and d_compare set, so that the dentries
- * contained in them are handled case-insensitively. Note that these operations
- * are needed on the parent directory rather than on the dentries in it, and
- * while the casefolding flag can be toggled on and off on an empty directory,
- * dentry_operations can't be changed later. As a result, if the filesystem has
- * casefolding support enabled at all, we have to give all dentries the
- * casefolding operations even if their inode doesn't have the casefolding flag
- * currently (and thus the casefolding ops would be no-ops for now).
+ * Casefolded directories need some dentry_operations set, so that the dentries
+ * contained in them are handled case-insensitively. Note that d_hash and
+ * d_compare are needed on the parent directory rather than on the dentries in
+ * it, and while the casefolding flag can be toggled on and off on an empty
+ * directory, dentry_operations can't be changed later. As a result, if the
+ * filesystem has casefolding support enabled at all, we have to give all
+ * dentries the casefolding operations even if their inode doesn't have the
+ * casefolding flag currently (and thus the casefolding ops would be no-ops for
+ * now).
*
* Encryption works differently in that the only dentry operation it needs is
* d_revalidate, which it only needs on dentries that have the no-key name flag.
@@ -1564,34 +1557,22 @@ static const struct dentry_operations generic_encrypted_ci_dentry_ops = {
* Finally, to maximize compatibility with overlayfs (which isn't compatible
* with certain dentry operations) and to avoid taking an unnecessary
* performance hit, we use custom dentry_operations for each possible
- * combination rather than always installing all operations.
+ * combination of operations rather than always installing them.
*/
void generic_set_encrypted_ci_d_ops(struct dentry *dentry)
{
-#ifdef CONFIG_FS_ENCRYPTION
- bool needs_encrypt_ops = dentry->d_flags & DCACHE_NOKEY_NAME;
-#endif
#if IS_ENABLED(CONFIG_UNICODE)
- bool needs_ci_ops = dentry->d_sb->s_encoding;
-#endif
-#if defined(CONFIG_FS_ENCRYPTION) && IS_ENABLED(CONFIG_UNICODE)
- if (needs_encrypt_ops && needs_ci_ops) {
+ if (dentry->d_sb->s_encoding) {
d_set_d_op(dentry, &generic_encrypted_ci_dentry_ops);
return;
}
#endif
#ifdef CONFIG_FS_ENCRYPTION
- if (needs_encrypt_ops) {
+ if (dentry->d_flags & DCACHE_NOKEY_NAME) {
d_set_d_op(dentry, &generic_encrypted_dentry_ops);
return;
}
#endif
-#if IS_ENABLED(CONFIG_UNICODE)
- if (needs_ci_ops) {
- d_set_d_op(dentry, &generic_ci_dentry_ops);
- return;
- }
-#endif
}
EXPORT_SYMBOL(generic_set_encrypted_ci_d_ops);

--
2.41.0