fs: change d_hash for rcu-walk

Change d_hash so it may be called from lock-free RCU lookups. See similar
patch for d_compare for details.

For in-tree filesystems, this is just a mechanical change.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>

19 files changed, 71 insertions, 43 deletions

diff --git a/fs/adfs/dir.c b/fs/adfs/dir.c
index c8ed66162bd..a11e5e10271 100644
--- a/fs/adfs/dir.c
+++ b/fs/adfs/dir.c
@@ -201,7 +201,8 @@ const struct file_operations adfs_dir_operations = {
 };
 
 static int
-adfs_hash(struct dentry *parent, struct qstr *qstr)
+adfs_hash(const struct dentry *parent, const struct inode *inode,
+                struct qstr *qstr)
 {
         const unsigned int name_len = ADFS_SB(parent->d_sb)->s_namelen;
         const unsigned char *name;
diff --git a/fs/affs/namei.c b/fs/affs/namei.c
index 547d5deb0d4..5aca08c2110 100644
--- a/fs/affs/namei.c
+++ b/fs/affs/namei.c
@@ -13,13 +13,15 @@
 typedef int (*toupper_t)(int);
 
 static int       affs_toupper(int ch);
-static int       affs_hash_dentry(struct dentry *, struct qstr *);
+static int       affs_hash_dentry(const struct dentry *,
+                const struct inode *, struct qstr *);
 static int       affs_compare_dentry(const struct dentry *parent,
                 const struct inode *pinode,
                 const struct dentry *dentry, const struct inode *inode,
                 unsigned int len, const char *str, const struct qstr *name);
 static int       affs_intl_toupper(int ch);
-static int       affs_intl_hash_dentry(struct dentry *, struct qstr *);
+static int       affs_intl_hash_dentry(const struct dentry *,
+                const struct inode *, struct qstr *);
 static int       affs_intl_compare_dentry(const struct dentry *parent,
                 const struct inode *pinode,
                 const struct dentry *dentry, const struct inode *inode,
@@ -64,13 +66,13 @@ affs_get_toupper(struct super_block *sb)
  * Note: the dentry argument is the parent dentry.
  */
 static inline int
-__affs_hash_dentry(struct dentry *dentry, struct qstr *qstr, toupper_t toupper)
+__affs_hash_dentry(struct qstr *qstr, toupper_t toupper)
 {
         const u8 *name = qstr->name;
         unsigned long hash;
         int i;
 
-        i = affs_check_name(qstr->name,qstr->len);
+        i = affs_check_name(qstr->name, qstr->len);
         if (i)
                 return i;
 
@@ -84,14 +86,16 @@ __affs_hash_dentry(struct dentry *dentry, struct qstr *qstr, toupper_t toupper)
 }
 
 static int
-affs_hash_dentry(struct dentry *dentry, struct qstr *qstr)
+affs_hash_dentry(const struct dentry *dentry, const struct inode *inode,
+                struct qstr *qstr)
 {
-        return __affs_hash_dentry(dentry, qstr, affs_toupper);
+        return __affs_hash_dentry(qstr, affs_toupper);
 }
 static int
-affs_intl_hash_dentry(struct dentry *dentry, struct qstr *qstr)
+affs_intl_hash_dentry(const struct dentry *dentry, const struct inode *inode,
+                struct qstr *qstr)
 {
-        return __affs_hash_dentry(dentry, qstr, affs_intl_toupper);
+        return __affs_hash_dentry(qstr, affs_intl_toupper);
 }
 
 static inline int __affs_compare_dentry(unsigned int len,
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index c60133f0d8e..88bfe686ac0 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -700,9 +700,10 @@ const struct dentry_operations cifs_dentry_ops = {
 /* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
 };
 
-static int cifs_ci_hash(struct dentry *dentry, struct qstr *q)
+static int cifs_ci_hash(const struct dentry *dentry, const struct inode *inode,
+                struct qstr *q)
 {
-        struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
+        struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
         unsigned long hash;
         int i;
 
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index a73eb9f4bda..ee463aeca0b 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -79,7 +79,7 @@ cifs_readdir_lookup(struct dentry *parent, struct qstr *name,
         cFYI(1, "For %s", name->name);
 
         if (parent->d_op && parent->d_op->d_hash)
-                parent->d_op->d_hash(parent, name);
+                parent->d_op->d_hash(parent, parent->d_inode, name);
         else
                 name->hash = full_name_hash(name->name, name->len);
 
diff --git a/fs/dcache.c b/fs/dcache.c
index 7075555fbb0..6f59f375ed9 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1478,7 +1478,7 @@ struct dentry *d_hash_and_lookup(struct dentry *dir, struct qstr *name)
          */
         name->hash = full_name_hash(name->name, name->len);
         if (dir->d_op && dir->d_op->d_hash) {
-                if (dir->d_op->d_hash(dir, name) < 0)
+                if (dir->d_op->d_hash(dir, dir->d_inode, name) < 0)
                         goto out;
         }
         dentry = d_lookup(dir, name);
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 9d1a22d6276..a1ed7a7cb17 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -454,7 +454,7 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
         lower_name.hash = ecryptfs_dentry->d_name.hash;
         if (lower_dir_dentry->d_op && lower_dir_dentry->d_op->d_hash) {
                 rc = lower_dir_dentry->d_op->d_hash(lower_dir_dentry,
-                                                    &lower_name);
+                                lower_dir_dentry->d_inode, &lower_name);
                 if (rc < 0)
                         goto out_d_drop;
         }
@@ -489,7 +489,7 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
         lower_name.hash = full_name_hash(lower_name.name, lower_name.len);
         if (lower_dir_dentry->d_op && lower_dir_dentry->d_op->d_hash) {
                 rc = lower_dir_dentry->d_op->d_hash(lower_dir_dentry,
-                                                    &lower_name);
+                                lower_dir_dentry->d_inode, &lower_name);
                 if (rc < 0)
                         goto out_d_drop;
         }
diff --git a/fs/fat/namei_msdos.c b/fs/fat/namei_msdos.c
index 99d3c7ac973..3b3e072d898 100644
--- a/fs/fat/namei_msdos.c
+++ b/fs/fat/namei_msdos.c
@@ -148,7 +148,8 @@ static int msdos_find(struct inode *dir, const unsigned char *name, int len,
  * that the existing dentry can be used. The msdos fs routines will
  * return ENOENT or EINVAL as appropriate.
  */
-static int msdos_hash(struct dentry *dentry, struct qstr *qstr)
+static int msdos_hash(const struct dentry *dentry, const struct inode *inode,
+               struct qstr *qstr)
 {
         struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options;
         unsigned char msdos_name[MSDOS_NAME];
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index 95e00ab84c3..4fc06278db4 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -103,7 +103,8 @@ static unsigned int vfat_striptail_len(const struct qstr *qstr)
  * that the existing dentry can be used. The vfat fs routines will
  * return ENOENT or EINVAL as appropriate.
  */
-static int vfat_hash(struct dentry *dentry, struct qstr *qstr)
+static int vfat_hash(const struct dentry *dentry, const struct inode *inode,
+                struct qstr *qstr)
 {
         qstr->hash = full_name_hash(qstr->name, vfat_striptail_len(qstr));
         return 0;
@@ -115,9 +116,10 @@ static int vfat_hash(struct dentry *dentry, struct qstr *qstr)
  * that the existing dentry can be used. The vfat fs routines will
  * return ENOENT or EINVAL as appropriate.
  */
-static int vfat_hashi(struct dentry *dentry, struct qstr *qstr)
+static int vfat_hashi(const struct dentry *dentry, const struct inode *inode,
+                struct qstr *qstr)
 {
-        struct nls_table *t = MSDOS_SB(dentry->d_inode->i_sb)->nls_io;
+        struct nls_table *t = MSDOS_SB(dentry->d_sb)->nls_io;
         const unsigned char *name;
         unsigned int len;
         unsigned long hash;
diff --git a/fs/gfs2/dentry.c b/fs/gfs2/dentry.c
index e80fea2f65f..50497f65763 100644
--- a/fs/gfs2/dentry.c
+++ b/fs/gfs2/dentry.c
@@ -100,7 +100,8 @@ fail:
         return 0;
 }
 
-static int gfs2_dhash(struct dentry *dentry, struct qstr *str)
+static int gfs2_dhash(const struct dentry *dentry, const struct inode *inode,
+                struct qstr *str)
 {
         str->hash = gfs2_disk_hash(str->name, str->len);
         return 0;
diff --git a/fs/hfs/hfs_fs.h b/fs/hfs/hfs_fs.h
index 8cd876f0e96..ad97c2d5828 100644
--- a/fs/hfs/hfs_fs.h
+++ b/fs/hfs/hfs_fs.h
@@ -213,7 +213,8 @@ extern int hfs_part_find(struct super_block *, sector_t *, sector_t *);
 /* string.c */
 extern const struct dentry_operations hfs_dentry_operations;
 
-extern int hfs_hash_dentry(struct dentry *, struct qstr *);
+extern int hfs_hash_dentry(const struct dentry *, const struct inode *,
+                struct qstr *);
 extern int hfs_strcmp(const unsigned char *, unsigned int,
                       const unsigned char *, unsigned int);
 extern int hfs_compare_dentry(const struct dentry *parent,
diff --git a/fs/hfs/string.c b/fs/hfs/string.c
index aaf90d0d694..495a976a3cc 100644
--- a/fs/hfs/string.c
+++ b/fs/hfs/string.c
@@ -51,7 +51,8 @@ static unsigned char caseorder[256] = {
 /*
  * Hash a string to an integer in a case-independent way
  */
-int hfs_hash_dentry(struct dentry *dentry, struct qstr *this)
+int hfs_hash_dentry(const struct dentry *dentry, const struct inode *inode,
+                struct qstr *this)
 {
         const unsigned char *name = this->name;
         unsigned int hash, len = this->len;
diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
index 7aa96eefe48..a5308f491e3 100644
--- a/fs/hfsplus/hfsplus_fs.h
+++ b/fs/hfsplus/hfsplus_fs.h
@@ -379,7 +379,8 @@ int hfsplus_strcasecmp(const struct hfsplus_unistr *, const struct hfsplus_unist
 int hfsplus_strcmp(const struct hfsplus_unistr *, const struct hfsplus_unistr *);
 int hfsplus_uni2asc(struct super_block *, const struct hfsplus_unistr *, char *, int *);
 int hfsplus_asc2uni(struct super_block *, struct hfsplus_unistr *, const char *, int);
-int hfsplus_hash_dentry(struct dentry *dentry, struct qstr *str);
+int hfsplus_hash_dentry(const struct dentry *dentry, const struct inode *inode,
+                struct qstr *str);
 int hfsplus_compare_dentry(const struct dentry *parent,
                 const struct inode *pinode,
                 const struct dentry *dentry, const struct inode *inode,
diff --git a/fs/hfsplus/unicode.c b/fs/hfsplus/unicode.c
index b178c997efa..d800aa0f2c8 100644
--- a/fs/hfsplus/unicode.c
+++ b/fs/hfsplus/unicode.c
@@ -320,7 +320,8 @@ int hfsplus_asc2uni(struct super_block *sb, struct hfsplus_unistr *ustr,
  * Composed unicode characters are decomposed and case-folding is performed
  * if the appropriate bits are (un)set on the superblock.
  */
-int hfsplus_hash_dentry(struct dentry *dentry, struct qstr *str)
+int hfsplus_hash_dentry(const struct dentry *dentry, const struct inode *inode,
+                struct qstr *str)
 {
         struct super_block *sb = dentry->d_sb;
         const char *astr;
diff --git a/fs/hpfs/dentry.c b/fs/hpfs/dentry.c
index dd9b1e74a73..35526df1fd3 100644
--- a/fs/hpfs/dentry.c
+++ b/fs/hpfs/dentry.c
@@ -12,7 +12,8 @@
  * Note: the dentry argument is the parent dentry.
  */
 
-static int hpfs_hash_dentry(struct dentry *dentry, struct qstr *qstr)
+static int hpfs_hash_dentry(const struct dentry *dentry, const struct inode *inode,
+                struct qstr *qstr)
 {
         unsigned long    hash;
         int              i;
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 7b0fbc61af8..d204ee4235f 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -26,8 +26,10 @@
 
 #define BEQUIET
 
-static int isofs_hashi(struct dentry *parent, struct qstr *qstr);
-static int isofs_hash(struct dentry *parent, struct qstr *qstr);
+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_dentry_cmpi(const struct dentry *parent,
                 const struct inode *pinode,
                 const struct dentry *dentry, const struct inode *inode,
@@ -38,8 +40,10 @@ static int isofs_dentry_cmp(const struct dentry *parent,
                 unsigned int len, const char *str, const struct qstr *name);
 
 #ifdef CONFIG_JOLIET
-static int isofs_hashi_ms(struct dentry *parent, struct qstr *qstr);
-static int isofs_hash_ms(struct dentry *parent, struct qstr *qstr);
+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_dentry_cmpi_ms(const struct dentry *parent,
                 const struct inode *pinode,
                 const struct dentry *dentry, const struct inode *inode,
@@ -172,7 +176,7 @@ struct iso9660_options{
  * Compute the hash for the isofs name corresponding to the dentry.
  */
 static int
-isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
+isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
 {
         const char *name;
         int len;
@@ -193,7 +197,7 @@ isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
  * Compute the hash for the isofs name corresponding to the dentry.
  */
 static int
-isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
+isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
 {
         const char *name;
         int len;
@@ -248,13 +252,15 @@ static int isofs_dentry_cmp_common(
 }
 
 static int
-isofs_hash(struct dentry *dentry, struct qstr *qstr)
+isofs_hash(const struct dentry *dentry, const struct inode *inode,
+                struct qstr *qstr)
 {
         return isofs_hash_common(dentry, qstr, 0);
 }
 
 static int
-isofs_hashi(struct dentry *dentry, struct qstr *qstr)
+isofs_hashi(const struct dentry *dentry, const struct inode *inode,
+                struct qstr *qstr)
 {
         return isofs_hashi_common(dentry, qstr, 0);
 }
@@ -277,13 +283,15 @@ isofs_dentry_cmpi(const struct dentry *parent, const struct inode *pinode,
 
 #ifdef CONFIG_JOLIET
 static int
-isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
+isofs_hash_ms(const struct dentry *dentry, const struct inode *inode,
+                struct qstr *qstr)
 {
         return isofs_hash_common(dentry, qstr, 1);
 }
 
 static int
-isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
+isofs_hashi_ms(const struct dentry *dentry, const struct inode *inode,
+                struct qstr *qstr)
 {
         return isofs_hashi_common(dentry, qstr, 1);
 }
diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 92129016cd7..57f90dad891 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -1574,7 +1574,8 @@ const struct file_operations jfs_dir_operations = {
         .llseek         = generic_file_llseek,
 };
 
-static int jfs_ci_hash(struct dentry *dir, struct qstr *this)
+static int jfs_ci_hash(const struct dentry *dir, const struct inode *inode,
+                struct qstr *this)
 {
         unsigned long hash;
         int i;
diff --git a/fs/namei.c b/fs/namei.c
index 4ff7ca53053..f3b5ca40465 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -731,7 +731,8 @@ static int do_lookup(struct nameidata *nd, struct qstr *name,
          * to use its own hash..
          */
         if (nd->path.dentry->d_op && nd->path.dentry->d_op->d_hash) {
-                int err = nd->path.dentry->d_op->d_hash(nd->path.dentry, name);
+                int err = nd->path.dentry->d_op->d_hash(nd->path.dentry,
+                                nd->path.dentry->d_inode, name);
                 if (err < 0)
                         return err;
         }
@@ -1134,7 +1135,7 @@ static struct dentry *__lookup_hash(struct qstr *name,
          * to use its own hash..
          */
         if (base->d_op && base->d_op->d_hash) {
-                err = base->d_op->d_hash(base, name);
+                err = base->d_op->d_hash(base, inode, name);
                 dentry = ERR_PTR(err);
                 if (err < 0)
                         goto out;
diff --git a/fs/ncpfs/dir.c b/fs/ncpfs/dir.c
index 3bcc68aed41..bbbf7922f42 100644
--- a/fs/ncpfs/dir.c
+++ b/fs/ncpfs/dir.c
@@ -74,7 +74,8 @@ const struct inode_operations ncp_dir_inode_operations =
  * Dentry operations routines
  */
 static int ncp_lookup_validate(struct dentry *, struct nameidata *);
-static int ncp_hash_dentry(struct dentry *, struct qstr *);
+static int ncp_hash_dentry(const struct dentry *, const struct inode *,
+                struct qstr *);
 static int ncp_compare_dentry(const struct dentry *, const struct inode *,
                 const struct dentry *, const struct inode *,
                 unsigned int, const char *, const struct qstr *);
@@ -129,9 +130,10 @@ static inline int ncp_case_sensitive(const struct inode *i)
  * is case-sensitive.
  */
 static int 
-ncp_hash_dentry(struct dentry *dentry, struct qstr *this)
+ncp_hash_dentry(const struct dentry *dentry, const struct inode *inode,
+                struct qstr *this)
 {
-        if (!ncp_case_sensitive(dentry->d_inode)) {
+        if (!ncp_case_sensitive(inode)) {
                 struct super_block *sb = dentry->d_sb;
                 struct nls_table *t;
                 unsigned long hash;
@@ -597,7 +599,7 @@ ncp_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
         qname.hash = full_name_hash(qname.name, qname.len);
 
         if (dentry->d_op && dentry->d_op->d_hash)
-                if (dentry->d_op->d_hash(dentry, &qname) != 0)
+                if (dentry->d_op->d_hash(dentry, dentry->d_inode, &qname) != 0)
                         goto end_advance;
 
         newdent = d_lookup(dentry, &qname);
diff --git a/fs/sysv/namei.c b/fs/sysv/namei.c
index 11e7f7d11cd..7507aeb4c90 100644
--- a/fs/sysv/namei.c
+++ b/fs/sysv/namei.c
@@ -27,7 +27,8 @@ static int add_nondir(struct dentry *dentry, struct inode *inode)
         return err;
 }
 
-static int sysv_hash(struct dentry *dentry, struct qstr *qstr)
+static int sysv_hash(const struct dentry *dentry, const struct inode *inode,
+                struct qstr *qstr)
 {
         /* Truncate the name in place, avoids having to define a compare
            function. */