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>
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index 9a76f8d..a15ee20 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -10,7 +10,8 @@
--------------------------- dentry_operations --------------------------
prototypes:
int (*d_revalidate)(struct dentry *, int);
- int (*d_hash) (struct dentry *, struct qstr *);
+ int (*d_hash)(const struct dentry *, const struct inode *,
+ struct qstr *);
int (*d_compare)(const struct dentry *, const struct inode *,
const struct dentry *, const struct inode *,
unsigned int, const char *, const struct qstr *);
@@ -22,7 +23,7 @@
locking rules:
dcache_lock rename_lock ->d_lock may block
d_revalidate: no no no yes
-d_hash no no no yes
+d_hash no no no no
d_compare: no yes no no
d_delete: yes no yes no
d_release: no no no yes
diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting
index d44511e..9fd3194 100644
--- a/Documentation/filesystems/porting
+++ b/Documentation/filesystems/porting
@@ -333,3 +333,10 @@
.d_compare() calling convention and locking rules are significantly
changed. Read updated documentation in Documentation/filesystems/vfs.txt (and
look at examples of other filesystems) for guidance.
+
+---
+[mandatory]
+
+ .d_hash() calling convention and locking rules are significantly
+changed. Read updated documentation in Documentation/filesystems/vfs.txt (and
+look at examples of other filesystems) for guidance.
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index 250681b..69b10ff 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -847,7 +847,8 @@
struct dentry_operations {
int (*d_revalidate)(struct dentry *, struct nameidata *);
- int (*d_hash)(struct dentry *, struct qstr *);
+ int (*d_hash)(const struct dentry *, const struct inode *,
+ struct qstr *);
int (*d_compare)(const struct dentry *, const struct inode *,
const struct dentry *, const struct inode *,
unsigned int, const char *, const struct qstr *);
@@ -864,7 +865,10 @@
d_hash: called when the VFS adds a dentry to the hash table. The first
dentry passed to d_hash is the parent directory that the name is
- to be hashed into.
+ to be hashed into. The inode is the dentry's inode.
+
+ Same locking and synchronisation rules as d_compare regarding
+ what is safe to dereference etc.
d_compare: called to compare a dentry name with a given name. The first
dentry is the parent of the dentry to be compared, the second is
diff --git a/drivers/staging/smbfs/cache.c b/drivers/staging/smbfs/cache.c
index dbd2e1d..0beded2 100644
--- a/drivers/staging/smbfs/cache.c
+++ b/drivers/staging/smbfs/cache.c
@@ -134,7 +134,7 @@
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, inode, qname) != 0)
goto end_advance;
newdent = d_lookup(dentry, qname);
diff --git a/drivers/staging/smbfs/dir.c b/drivers/staging/smbfs/dir.c
index bd63229..5f79799 100644
--- a/drivers/staging/smbfs/dir.c
+++ b/drivers/staging/smbfs/dir.c
@@ -274,7 +274,8 @@
* Dentry operations routines
*/
static int smb_lookup_validate(struct dentry *, struct nameidata *);
-static int smb_hash_dentry(struct dentry *, struct qstr *);
+static int smb_hash_dentry(const struct dentry *, const struct inode *,
+ struct qstr *);
static int smb_compare_dentry(const struct dentry *,
const struct inode *,
const struct dentry *, const struct inode *,
@@ -336,7 +337,8 @@
}
static int
-smb_hash_dentry(struct dentry *dir, struct qstr *this)
+smb_hash_dentry(const struct dentry *dir, const struct inode *inode,
+ struct qstr *this)
{
unsigned long hash;
int i;
diff --git a/fs/adfs/dir.c b/fs/adfs/dir.c
index c8ed661..a11e5e1 100644
--- a/fs/adfs/dir.c
+++ b/fs/adfs/dir.c
@@ -201,7 +201,8 @@
};
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 547d5de..5aca08c 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 @@
* 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 @@
}
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 c60133f..88bfe68 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -700,9 +700,10 @@
/* 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 a73eb9f..ee463ae 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -79,7 +79,7 @@
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 7075555..6f59f37 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1478,7 +1478,7 @@
*/
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 9d1a22d..a1ed7a7 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -454,7 +454,7 @@
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 @@
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 99d3c7a..3b3e072 100644
--- a/fs/fat/namei_msdos.c
+++ b/fs/fat/namei_msdos.c
@@ -148,7 +148,8 @@
* 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 95e00ab..4fc0627 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -103,7 +103,8 @@
* 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 @@
* 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 e80fea2..50497f6 100644
--- a/fs/gfs2/dentry.c
+++ b/fs/gfs2/dentry.c
@@ -100,7 +100,8 @@
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 8cd876f..ad97c2d 100644
--- a/fs/hfs/hfs_fs.h
+++ b/fs/hfs/hfs_fs.h
@@ -213,7 +213,8 @@
/* 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 aaf90d0..495a976 100644
--- a/fs/hfs/string.c
+++ b/fs/hfs/string.c
@@ -51,7 +51,8 @@
/*
* 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 7aa96ee..a5308f4 100644
--- a/fs/hfsplus/hfsplus_fs.h
+++ b/fs/hfsplus/hfsplus_fs.h
@@ -379,7 +379,8 @@
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 b178c99..d800aa0 100644
--- a/fs/hfsplus/unicode.c
+++ b/fs/hfsplus/unicode.c
@@ -320,7 +320,8 @@
* 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 dd9b1e7..35526df 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 7b0fbc6..d204ee4 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 @@
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 @@
* 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 @@
* 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_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 @@
#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 9212901..57f90da 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -1574,7 +1574,8 @@
.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 4ff7ca5..f3b5ca4 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -731,7 +731,8 @@
* 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 @@
* 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 3bcc68a..bbbf7922 100644
--- a/fs/ncpfs/dir.c
+++ b/fs/ncpfs/dir.c
@@ -74,7 +74,8 @@
* 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 @@
* 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 @@
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 11e7f7d..7507aeb 100644
--- a/fs/sysv/namei.c
+++ b/fs/sysv/namei.c
@@ -27,7 +27,8 @@
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. */
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 75a072b..1149e70 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -133,7 +133,8 @@
struct dentry_operations {
int (*d_revalidate)(struct dentry *, struct nameidata *);
- int (*d_hash)(struct dentry *, struct qstr *);
+ int (*d_hash)(const struct dentry *, const struct inode *,
+ struct qstr *);
int (*d_compare)(const struct dentry *, const struct inode *,
const struct dentry *, const struct inode *,
unsigned int, const char *, const struct qstr *);