Don't pass inode to ->d_hash() and ->d_compare()

Instances either don't look at it at all (the majority of cases) or
only want it to find the superblock (which can be had as dentry->d_sb).
A few cases that want more are actually safe with dentry->d_inode -
the only precaution needed is the check that it hadn't been replaced with
NULL by rmdir() or by overwriting rename(), which case should be simply
treated as cache miss.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

2 files changed, 17 insertions, 34 deletions

diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index d9b8aebdeb22..c348d6d88624 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -28,31 +28,23 @@
 
 #define BEQUIET
 
-static int isofs_hashi(const struct dentry *parent, const struct inode *inode,
-		struct qstr *qstr);
-static int isofs_hash(const struct dentry *parent, const struct inode *inode,
-		struct qstr *qstr);
+static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
+static int isofs_hash(const struct dentry *parent, struct qstr *qstr);
 static int isofs_dentry_cmpi(const struct dentry *parent,
-		const struct inode *pinode,
-		const struct dentry *dentry, const struct inode *inode,
+		const struct dentry *dentry,
 		unsigned int len, const char *str, const struct qstr *name);
 static int isofs_dentry_cmp(const struct dentry *parent,
-		const struct inode *pinode,
-		const struct dentry *dentry, const struct inode *inode,
+		const struct dentry *dentry,
 		unsigned int len, const char *str, const struct qstr *name);
 
 #ifdef CONFIG_JOLIET
-static int isofs_hashi_ms(const struct dentry *parent, const struct inode *inode,
-		struct qstr *qstr);
-static int isofs_hash_ms(const struct dentry *parent, const struct inode *inode,
-		struct qstr *qstr);
+static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
+static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
 static int isofs_dentry_cmpi_ms(const struct dentry *parent,
-		const struct inode *pinode,
-		const struct dentry *dentry, const struct inode *inode,
+		const struct dentry *dentry,
 		unsigned int len, const char *str, const struct qstr *name);
 static int isofs_dentry_cmp_ms(const struct dentry *parent,
-		const struct inode *pinode,
-		const struct dentry *dentry, const struct inode *inode,
+		const struct dentry *dentry,
 		unsigned int len, const char *str, const struct qstr *name);
 #endif
 
@@ -265,30 +257,26 @@ static int isofs_dentry_cmp_common(
 }
 
 static int
-isofs_hash(const struct dentry *dentry, const struct inode *inode,
-		struct qstr *qstr)
+isofs_hash(const struct dentry *dentry, struct qstr *qstr)
 {
 	return isofs_hash_common(dentry, qstr, 0);
 }
 
 static int
-isofs_hashi(const struct dentry *dentry, const struct inode *inode,
-		struct qstr *qstr)
+isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
 {
 	return isofs_hashi_common(dentry, qstr, 0);
 }
 
 static int
-isofs_dentry_cmp(const struct dentry *parent, const struct inode *pinode,
-		const struct dentry *dentry, const struct inode *inode,
+isofs_dentry_cmp(const struct dentry *parent, const struct dentry *dentry,
 		unsigned int len, const char *str, const struct qstr *name)
 {
 	return isofs_dentry_cmp_common(len, str, name, 0, 0);
 }
 
 static int
-isofs_dentry_cmpi(const struct dentry *parent, const struct inode *pinode,
-		const struct dentry *dentry, const struct inode *inode,
+isofs_dentry_cmpi(const struct dentry *parent, const struct dentry *dentry,
 		unsigned int len, const char *str, const struct qstr *name)
 {
 	return isofs_dentry_cmp_common(len, str, name, 0, 1);
@@ -296,30 +284,26 @@ isofs_dentry_cmpi(const struct dentry *parent, const struct inode *pinode,
 
 #ifdef CONFIG_JOLIET
 static int
-isofs_hash_ms(const struct dentry *dentry, const struct inode *inode,
-		struct qstr *qstr)
+isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
 {
 	return isofs_hash_common(dentry, qstr, 1);
 }
 
 static int
-isofs_hashi_ms(const struct dentry *dentry, const struct inode *inode,
-		struct qstr *qstr)
+isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
 {
 	return isofs_hashi_common(dentry, qstr, 1);
 }
 
 static int
-isofs_dentry_cmp_ms(const struct dentry *parent, const struct inode *pinode,
-		const struct dentry *dentry, const struct inode *inode,
+isofs_dentry_cmp_ms(const struct dentry *parent, const struct dentry *dentry,
 		unsigned int len, const char *str, const struct qstr *name)
 {
 	return isofs_dentry_cmp_common(len, str, name, 1, 0);
 }
 
 static int
-isofs_dentry_cmpi_ms(const struct dentry *parent, const struct inode *pinode,
-		const struct dentry *dentry, const struct inode *inode,
+isofs_dentry_cmpi_ms(const struct dentry *parent, const struct dentry *dentry,
 		unsigned int len, const char *str, const struct qstr *name)
 {
 	return isofs_dentry_cmp_common(len, str, name, 1, 1);
diff --git a/fs/isofs/namei.c b/fs/isofs/namei.c
index c167028844ed..95295640d9c8 100644
--- a/fs/isofs/namei.c
+++ b/fs/isofs/namei.c
@@ -37,8 +37,7 @@ isofs_cmp(struct dentry *dentry, const char *compare, int dlen)
 
 	qstr.name = compare;
 	qstr.len = dlen;
-	return dentry->d_op->d_compare(NULL, NULL, NULL, NULL,
-			dentry->d_name.len, dentry->d_name.name, &qstr);
+	return dentry->d_op->d_compare(NULL, NULL, dentry->d_name.len, dentry->d_name.name, &qstr);
 }
 
 /*