[PATCH 36/46] fs: dcache reduce branches in lookup path

From: Nick Piggin
Date: Sat Nov 27 2010 - 05:30:33 EST

Reduce some branches and memory accesses in dcache lookup by adding dentry
flags to indicate common d_ops are set, rather than having to check them.
This saves a pointer memory access (dentry->d_op) in common path lookup
situations, and saves another pointer load and branch in cases where we
have d_op but not the particular operation.

Patched with:

git grep -l "d_op =" | xargs sed -e 's/\([^\t ]*\)->d_op = \(.*\);/d_set_d_op(\1, \2);/' -e 's/\([^\t ]*\)\.d_op = \(.*\);/d_set_d_op(\&\1, \2);/' -i

Signed-off-by: Nick Piggin <npiggin@xxxxxxxxx>
---
arch/ia64/kernel/perfmon.c | 2 +-
drivers/staging/autofs/root.c | 2 +-
fs/9p/vfs_inode.c | 26 +++++++++++++-------------
fs/adfs/dir.c | 2 +-
fs/adfs/super.c | 2 +-
fs/affs/namei.c | 2 +-
fs/affs/super.c | 2 +-
fs/afs/dir.c | 2 +-
fs/anon_inodes.c | 2 +-
fs/autofs4/inode.c | 2 +-
fs/autofs4/root.c | 10 +++++-----
fs/btrfs/export.c | 4 ++--
fs/btrfs/inode.c | 2 +-
fs/ceph/dir.c | 6 +++---
fs/cifs/dir.c | 16 ++++++++--------
fs/cifs/inode.c | 8 ++++----
fs/cifs/link.c | 4 ++--
fs/cifs/readdir.c | 4 ++--
fs/coda/dir.c | 2 +-
fs/configfs/dir.c | 8 ++++----
fs/dcache.c | 25 +++++++++++++++++++++----
fs/ecryptfs/inode.c | 2 +-
fs/ecryptfs/main.c | 4 ++--
fs/fat/inode.c | 4 ++--
fs/fat/namei_msdos.c | 6 +++---
fs/fat/namei_vfat.c | 8 ++++----
fs/fuse/dir.c | 2 +-
fs/fuse/inode.c | 4 ++--
fs/gfs2/export.c | 4 ++--
fs/gfs2/ops_fstype.c | 2 +-
fs/gfs2/ops_inode.c | 2 +-
fs/hfs/dir.c | 2 +-
fs/hfs/super.c | 2 +-
fs/hfsplus/dir.c | 2 +-
fs/hfsplus/super.c | 2 +-
fs/hostfs/hostfs_kern.c | 2 +-
fs/hpfs/dentry.c | 2 +-
fs/isofs/inode.c | 2 +-
fs/isofs/namei.c | 2 +-
fs/jfs/namei.c | 4 ++--
fs/jfs/super.c | 2 +-
fs/libfs.c | 2 +-
fs/minix/namei.c | 2 +-
fs/namei.c | 31 ++++++++++++++++++++-----------
fs/ncpfs/dir.c | 4 ++--
fs/ncpfs/inode.c | 2 +-
fs/nfs/dir.c | 6 +++---
fs/nfs/getroot.c | 4 ++--
fs/ocfs2/export.c | 4 ++--
fs/ocfs2/namei.c | 10 +++++-----
fs/pipe.c | 2 +-
fs/proc/base.c | 12 ++++++------
fs/proc/generic.c | 2 +-
fs/proc/proc_sysctl.c | 4 ++--
fs/reiserfs/xattr.c | 2 +-
fs/sysfs/dir.c | 2 +-
fs/sysv/namei.c | 2 +-
fs/sysv/super.c | 2 +-
include/linux/dcache.h | 6 ++++++
kernel/cgroup.c | 2 +-
net/socket.c | 2 +-
net/sunrpc/rpc_pipe.c | 2 +-
62 files changed, 165 insertions(+), 133 deletions(-)

diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index d39d8a5..5a24f40 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -2233,7 +2233,7 @@ pfm_alloc_file(pfm_context_t *ctx)
}
path.mnt = mntget(pfmfs_mnt);

- path.dentry->d_op = &pfmfs_dentry_operations;
+ d_set_d_op(path.dentry, &pfmfs_dentry_operations);
d_add(path.dentry, inode);

file = alloc_file(&path, FMODE_READ, &pfm_file_ops);
diff --git a/drivers/staging/autofs/root.c b/drivers/staging/autofs/root.c
index 0fdec4b..b09adb5 100644
--- a/drivers/staging/autofs/root.c
+++ b/drivers/staging/autofs/root.c
@@ -237,7 +237,7 @@ static struct dentry *autofs_root_lookup(struct inode *dir, struct dentry *dentr
*
* We need to do this before we release the directory semaphore.
*/
- dentry->d_op = &autofs_dentry_operations;
+ d_set_d_op(dentry, &autofs_dentry_operations);
dentry->d_flags |= DCACHE_AUTOFS_PENDING;
d_add(dentry, NULL);

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index f6f9081..df8bbb3 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -635,9 +635,9 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
}

if (v9ses->cache)
- dentry->d_op = &v9fs_cached_dentry_operations;
+ d_set_d_op(dentry, &v9fs_cached_dentry_operations);
else
- dentry->d_op = &v9fs_dentry_operations;
+ d_set_d_op(dentry, &v9fs_dentry_operations);

d_instantiate(dentry, inode);
err = v9fs_fid_add(dentry, fid);
@@ -749,7 +749,7 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
err);
goto error;
}
- dentry->d_op = &v9fs_cached_dentry_operations;
+ d_set_d_op(dentry, &v9fs_cached_dentry_operations);
d_instantiate(dentry, inode);
err = v9fs_fid_add(dentry, fid);
if (err < 0)
@@ -767,7 +767,7 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
err = PTR_ERR(inode);
goto error;
}
- dentry->d_op = &v9fs_dentry_operations;
+ d_set_d_op(dentry, &v9fs_dentry_operations);
d_instantiate(dentry, inode);
}
/* Now set the ACL based on the default value */
@@ -956,7 +956,7 @@ static int v9fs_vfs_mkdir_dotl(struct inode *dir,
err);
goto error;
}
- dentry->d_op = &v9fs_cached_dentry_operations;
+ d_set_d_op(dentry, &v9fs_cached_dentry_operations);
d_instantiate(dentry, inode);
err = v9fs_fid_add(dentry, fid);
if (err < 0)
@@ -973,7 +973,7 @@ static int v9fs_vfs_mkdir_dotl(struct inode *dir,
err = PTR_ERR(inode);
goto error;
}
- dentry->d_op = &v9fs_dentry_operations;
+ d_set_d_op(dentry, &v9fs_dentry_operations);
d_instantiate(dentry, inode);
}
/* Now set the ACL based on the default value */
@@ -1041,9 +1041,9 @@ static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,

inst_out:
if (v9ses->cache)
- dentry->d_op = &v9fs_cached_dentry_operations;
+ d_set_d_op(dentry, &v9fs_cached_dentry_operations);
else
- dentry->d_op = &v9fs_dentry_operations;
+ d_set_d_op(dentry, &v9fs_dentry_operations);

d_add(dentry, inode);
return NULL;
@@ -1709,7 +1709,7 @@ v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
err);
goto error;
}
- dentry->d_op = &v9fs_cached_dentry_operations;
+ d_set_d_op(dentry, &v9fs_cached_dentry_operations);
d_instantiate(dentry, inode);
err = v9fs_fid_add(dentry, fid);
if (err < 0)
@@ -1722,7 +1722,7 @@ v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
err = PTR_ERR(inode);
goto error;
}
- dentry->d_op = &v9fs_dentry_operations;
+ d_set_d_op(dentry, &v9fs_dentry_operations);
d_instantiate(dentry, inode);
}

@@ -1856,7 +1856,7 @@ v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
ihold(old_dentry->d_inode);
}

- dentry->d_op = old_dentry->d_op;
+ d_set_d_op(dentry, old_dentry->d_op);
d_instantiate(dentry, old_dentry->d_inode);

return err;
@@ -1980,7 +1980,7 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
err);
goto error;
}
- dentry->d_op = &v9fs_cached_dentry_operations;
+ d_set_d_op(dentry, &v9fs_cached_dentry_operations);
d_instantiate(dentry, inode);
err = v9fs_fid_add(dentry, fid);
if (err < 0)
@@ -1996,7 +1996,7 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
err = PTR_ERR(inode);
goto error;
}
- dentry->d_op = &v9fs_dentry_operations;
+ d_set_d_op(dentry, &v9fs_dentry_operations);
d_instantiate(dentry, inode);
}
/* Now set the ACL based on the default value */
diff --git a/fs/adfs/dir.c b/fs/adfs/dir.c
index a098bba..ee00001 100644
--- a/fs/adfs/dir.c
+++ b/fs/adfs/dir.c
@@ -276,7 +276,7 @@ adfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
struct object_info obj;
int error;

- dentry->d_op = &adfs_dentry_operations;
+ d_set_d_op(dentry, &adfs_dentry_operations);
lock_kernel();
error = adfs_dir_lookup_byname(dir, &dentry->d_name, &obj);
if (error == 0) {
diff --git a/fs/adfs/super.c b/fs/adfs/super.c
index 47dffc5..a4041b5 100644
--- a/fs/adfs/super.c
+++ b/fs/adfs/super.c
@@ -484,7 +484,7 @@ static int adfs_fill_super(struct super_block *sb, void *data, int silent)
adfs_error(sb, "get root inode failed\n");
goto error;
} else
- sb->s_root->d_op = &adfs_dentry_operations;
+ d_set_d_op(sb->s_root, &adfs_dentry_operations);
unlock_kernel();
return 0;

diff --git a/fs/affs/namei.c b/fs/affs/namei.c
index 91d5dcd..b69ba2d 100644
--- a/fs/affs/namei.c
+++ b/fs/affs/namei.c
@@ -238,7 +238,7 @@ affs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
if (IS_ERR(inode))
return ERR_CAST(inode);
}
- dentry->d_op = AFFS_SB(sb)->s_flags & SF_INTL ? &affs_intl_dentry_operations : &affs_dentry_operations;
+ d_set_d_op(dentry, AFFS_SB(sb)->s_flags & SF_INTL ? &affs_intl_dentry_operations : &affs_dentry_operations);
d_add(dentry, inode);
return NULL;
}
diff --git a/fs/affs/super.c b/fs/affs/super.c
index 4c18fcf..d39081b 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -482,7 +482,7 @@ got_root:
printk(KERN_ERR "AFFS: Get root inode failed\n");
goto out_error;
}
- sb->s_root->d_op = &affs_dentry_operations;
+ d_set_d_op(sb->s_root, &affs_dentry_operations);

pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
return 0;
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 2c18cde..b8bb7e7 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -581,7 +581,7 @@ static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
}

success:
- dentry->d_op = &afs_fs_dentry_operations;
+ d_set_d_op(dentry, &afs_fs_dentry_operations);

d_add(dentry, inode);
_leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%llu }",
diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
index 57ce55b..aca8806 100644
--- a/fs/anon_inodes.c
+++ b/fs/anon_inodes.c
@@ -113,7 +113,7 @@ struct file *anon_inode_getfile(const char *name,
*/
ihold(anon_inode_inode);

- path.dentry->d_op = &anon_inodefs_dentry_operations;
+ d_set_d_op(path.dentry, &anon_inodefs_dentry_operations);
d_instantiate(path.dentry, anon_inode_inode);

error = -ENFILE;
diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index ac87e49..a7bdb9d 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -309,7 +309,7 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
goto fail_iput;
pipe = NULL;

- root->d_op = &autofs4_sb_dentry_operations;
+ d_set_d_op(root, &autofs4_sb_dentry_operations);
root->d_fsdata = ino;

/* Can this call block? */
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 3eaa251..5b0421f 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -571,7 +571,7 @@ static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, s
* we check for the hashed dentry and return the newly
* hashed dentry.
*/
- dentry->d_op = &autofs4_root_dentry_operations;
+ d_set_d_op(dentry, &autofs4_root_dentry_operations);

/*
* And we need to ensure that the same dentry is used for
@@ -710,9 +710,9 @@ static int autofs4_dir_symlink(struct inode *dir,
d_add(dentry, inode);

if (dir == dir->i_sb->s_root->d_inode)
- dentry->d_op = &autofs4_root_dentry_operations;
+ d_set_d_op(dentry, &autofs4_root_dentry_operations);
else
- dentry->d_op = &autofs4_dentry_operations;
+ d_set_d_op(dentry, &autofs4_dentry_operations);

dentry->d_fsdata = ino;
ino->dentry = dget(dentry);
@@ -845,9 +845,9 @@ static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, int mode)
d_add(dentry, inode);

if (dir == dir->i_sb->s_root->d_inode)
- dentry->d_op = &autofs4_root_dentry_operations;
+ d_set_d_op(dentry, &autofs4_root_dentry_operations);
else
- dentry->d_op = &autofs4_dentry_operations;
+ d_set_d_op(dentry, &autofs4_dentry_operations);

dentry->d_fsdata = ino;
ino->dentry = dget(dentry);
diff --git a/fs/btrfs/export.c b/fs/btrfs/export.c
index 951ef09..19ff716 100644
--- a/fs/btrfs/export.c
+++ b/fs/btrfs/export.c
@@ -110,7 +110,7 @@ static struct dentry *btrfs_get_dentry(struct super_block *sb, u64 objectid,

dentry = d_obtain_alias(inode);
if (!IS_ERR(dentry))
- dentry->d_op = &btrfs_dentry_operations;
+ d_set_d_op(dentry, &btrfs_dentry_operations);
return dentry;
fail:
srcu_read_unlock(&fs_info->subvol_srcu, index);
@@ -225,7 +225,7 @@ static struct dentry *btrfs_get_parent(struct dentry *child)
key.offset = 0;
dentry = d_obtain_alias(btrfs_iget(root->fs_info->sb, &key, root, NULL));
if (!IS_ERR(dentry))
- dentry->d_op = &btrfs_dentry_operations;
+ d_set_d_op(dentry, &btrfs_dentry_operations);
return dentry;
fail:
btrfs_free_path(path);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index c704fd1..aab3087 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4084,7 +4084,7 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
int index;
int ret;

- dentry->d_op = &btrfs_dentry_operations;
+ d_set_d_op(dentry, &btrfs_dentry_operations);

if (dentry->d_name.len > BTRFS_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index e42d2a1..5c89989 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -41,11 +41,11 @@ int ceph_init_dentry(struct dentry *dentry)
return 0;

if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
- dentry->d_op = &ceph_dentry_ops;
+ d_set_d_op(dentry, &ceph_dentry_ops);
else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR)
- dentry->d_op = &ceph_snapdir_dentry_ops;
+ d_set_d_op(dentry, &ceph_snapdir_dentry_ops);
else
- dentry->d_op = &ceph_snap_dentry_ops;
+ d_set_d_op(dentry, &ceph_snap_dentry_ops);

di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO);
if (!di)
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 5227626..966f58c 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -135,9 +135,9 @@ static void setup_cifs_dentry(struct cifsTconInfo *tcon,
struct inode *newinode)
{
if (tcon->nocase)
- direntry->d_op = &cifs_ci_dentry_ops;
+ d_set_d_op(direntry, &cifs_ci_dentry_ops);
else
- direntry->d_op = &cifs_dentry_ops;
+ d_set_d_op(direntry, &cifs_dentry_ops);
d_instantiate(direntry, newinode);
}

@@ -421,9 +421,9 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
rc = cifs_get_inode_info_unix(&newinode, full_path,
inode->i_sb, xid);
if (pTcon->nocase)
- direntry->d_op = &cifs_ci_dentry_ops;
+ d_set_d_op(direntry, &cifs_ci_dentry_ops);
else
- direntry->d_op = &cifs_dentry_ops;
+ d_set_d_op(direntry, &cifs_dentry_ops);

if (rc == 0)
d_instantiate(direntry, newinode);
@@ -604,9 +604,9 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,

if ((rc == 0) && (newInode != NULL)) {
if (pTcon->nocase)
- direntry->d_op = &cifs_ci_dentry_ops;
+ d_set_d_op(direntry, &cifs_ci_dentry_ops);
else
- direntry->d_op = &cifs_dentry_ops;
+ d_set_d_op(direntry, &cifs_dentry_ops);
d_add(direntry, newInode);
if (posix_open) {
filp = lookup_instantiate_filp(nd, direntry,
@@ -634,9 +634,9 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
rc = 0;
direntry->d_time = jiffies;
if (pTcon->nocase)
- direntry->d_op = &cifs_ci_dentry_ops;
+ d_set_d_op(direntry, &cifs_ci_dentry_ops);
else
- direntry->d_op = &cifs_dentry_ops;
+ d_set_d_op(direntry, &cifs_dentry_ops);
d_add(direntry, NULL);
/* if it was once a directory (but how can we tell?) we could do
shrink_dcache_parent(direntry); */
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index ca901f0..76677de 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1314,9 +1314,9 @@ int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
to set uid/gid */
inc_nlink(inode);
if (pTcon->nocase)
- direntry->d_op = &cifs_ci_dentry_ops;
+ d_set_d_op(direntry, &cifs_ci_dentry_ops);
else
- direntry->d_op = &cifs_dentry_ops;
+ d_set_d_op(direntry, &cifs_dentry_ops);

cifs_unix_basic_to_fattr(&fattr, pInfo, cifs_sb);
cifs_fill_uniqueid(inode->i_sb, &fattr);
@@ -1358,9 +1358,9 @@ mkdir_get_info:
inode->i_sb, xid, NULL);

if (pTcon->nocase)
- direntry->d_op = &cifs_ci_dentry_ops;
+ d_set_d_op(direntry, &cifs_ci_dentry_ops);
else
- direntry->d_op = &cifs_dentry_ops;
+ d_set_d_op(direntry, &cifs_dentry_ops);
d_instantiate(direntry, newinode);
/* setting nlink not necessary except in cases where we
* failed to get it from the server or was set bogus */
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 85cdbf8..fe2f6a9 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -525,9 +525,9 @@ cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
rc);
} else {
if (pTcon->nocase)
- direntry->d_op = &cifs_ci_dentry_ops;
+ d_set_d_op(direntry, &cifs_ci_dentry_ops);
else
- direntry->d_op = &cifs_dentry_ops;
+ d_set_d_op(direntry, &cifs_dentry_ops);
d_instantiate(direntry, newinode);
}
}
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index ec5b2af..9d5b00f 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -103,9 +103,9 @@ cifs_readdir_lookup(struct dentry *parent, struct qstr *name,
}

if (cifs_sb_master_tcon(CIFS_SB(sb))->nocase)
- dentry->d_op = &cifs_ci_dentry_ops;
+ d_set_d_op(dentry, &cifs_ci_dentry_ops);
else
- dentry->d_op = &cifs_dentry_ops;
+ d_set_d_op(dentry, &cifs_dentry_ops);

alias = d_materialise_unique(dentry, inode);
if (alias != NULL) {
diff --git a/fs/coda/dir.c b/fs/coda/dir.c
index 9e37e8b..aa40c81 100644
--- a/fs/coda/dir.c
+++ b/fs/coda/dir.c
@@ -125,7 +125,7 @@ static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, struc
return ERR_PTR(error);

exit:
- entry->d_op = &coda_dentry_operations;
+ d_set_d_op(entry, &coda_dentry_operations);

if (inode && (type & CODA_NOCACHE))
coda_flag_inode(inode, C_VATTR | C_PURGE);
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index 5825780..8cd00c3 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -234,7 +234,7 @@ int configfs_make_dirent(struct configfs_dirent * parent_sd,
sd->s_dentry = dentry;
if (dentry) {
dentry->d_fsdata = configfs_get(sd);
- dentry->d_op = &configfs_dentry_ops;
+ d_set_d_op(dentry, &configfs_dentry_ops);
}

return 0;
@@ -278,7 +278,7 @@ static int create_dir(struct config_item * k, struct dentry * p,
error = configfs_create(d, mode, init_dir);
if (!error) {
inc_nlink(p->d_inode);
- (d)->d_op = &configfs_dentry_ops;
+ d_set_d_op((d), &configfs_dentry_ops);
} else {
struct configfs_dirent *sd = d->d_fsdata;
if (sd) {
@@ -372,7 +372,7 @@ int configfs_create_link(struct configfs_symlink *sl,
if (!err) {
err = configfs_create(dentry, mode, init_symlink);
if (!err)
- dentry->d_op = &configfs_dentry_ops;
+ d_set_d_op(dentry, &configfs_dentry_ops);
else {
struct configfs_dirent *sd = dentry->d_fsdata;
if (sd) {
@@ -447,7 +447,7 @@ static int configfs_attach_attr(struct configfs_dirent * sd, struct dentry * den
return error;
}

- dentry->d_op = &configfs_dentry_ops;
+ d_set_d_op(dentry, &configfs_dentry_ops);
d_rehash(dentry);

return 0;
diff --git a/fs/dcache.c b/fs/dcache.c
index c25be71..879e5b3 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -322,7 +322,7 @@ repeat:
return;
}

- if (dentry->d_op && dentry->d_op->d_delete) {
+ if (dentry->d_flags & DCACHE_OP_DELETE) {
if (dentry->d_op->d_delete(dentry))
goto kill_it;
}
@@ -1234,6 +1234,23 @@ struct dentry *d_alloc_name(struct dentry *parent, const char *name)
}
EXPORT_SYMBOL(d_alloc_name);

+void d_set_d_op(struct dentry *dentry, const struct dentry_operations *op)
+{
+ dentry->d_op = op;
+ if (!op)
+ return;
+ if (op->d_hash)
+ dentry->d_flags |= DCACHE_OP_HASH;
+ if (op->d_compare)
+ dentry->d_flags |= DCACHE_OP_COMPARE;
+ if (op->d_revalidate)
+ dentry->d_flags |= DCACHE_OP_REVALIDATE;
+ if (op->d_delete)
+ dentry->d_flags |= DCACHE_OP_DELETE;
+
+}
+EXPORT_SYMBOL(d_set_d_op);
+
static void __d_instantiate(struct dentry *dentry, struct inode *inode)
{
spin_lock(&dentry->d_lock);
@@ -1651,7 +1668,7 @@ seqretry:
*/
if (read_seqcount_retry(&dentry->d_seq, *seq))
goto seqretry;
- if (parent->d_op && parent->d_op->d_compare) {
+ if (parent->d_flags & DCACHE_OP_COMPARE) {
if (parent->d_op->d_compare(parent,
dentry, i,
tlen, tname, name))
@@ -1780,7 +1797,7 @@ struct dentry *__d_lookup(struct dentry *parent, struct qstr *name)
*/
tlen = dentry->d_name.len;
tname = dentry->d_name.name;
- if (parent->d_op && parent->d_op->d_compare) {
+ if (parent->d_flags & DCACHE_OP_COMPARE) {
if (parent->d_op->d_compare(parent,
dentry, dentry->d_inode,
tlen, tname, name))
@@ -1821,7 +1838,7 @@ struct dentry *d_hash_and_lookup(struct dentry *dir, struct qstr *name)
* routine may choose to leave the hash value unchanged.
*/
name->hash = full_name_hash(name->name, name->len);
- if (dir->d_op && dir->d_op->d_hash) {
+ if (dir->d_flags & DCACHE_OP_HASH) {
if (dir->d_op->d_hash(dir, dir->d_inode, name) < 0)
goto out;
}
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 5e5c7ec..f91b35d 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -441,7 +441,7 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
struct qstr lower_name;
int rc = 0;

- ecryptfs_dentry->d_op = &ecryptfs_dops;
+ d_set_d_op(ecryptfs_dentry, &ecryptfs_dops);
if ((ecryptfs_dentry->d_name.len == 1
&& !strcmp(ecryptfs_dentry->d_name.name, "."))
|| (ecryptfs_dentry->d_name.len == 2
diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index a9dbd62..3510386 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -189,7 +189,7 @@ int ecryptfs_interpose(struct dentry *lower_dentry, struct dentry *dentry,
if (special_file(lower_inode->i_mode))
init_special_inode(inode, lower_inode->i_mode,
lower_inode->i_rdev);
- dentry->d_op = &ecryptfs_dops;
+ d_set_d_op(dentry, &ecryptfs_dops);
fsstack_copy_attr_all(inode, lower_inode);
/* This size will be overwritten for real files w/ headers and
* other metadata */
@@ -594,7 +594,7 @@ static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags
deactivate_locked_super(s);
goto out;
}
- s->s_root->d_op = &ecryptfs_dops;
+ d_set_d_op(s->s_root, &ecryptfs_dops);
s->s_root->d_sb = s;
s->s_root->d_parent = s->s_root;

diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 8cccfeb..206351a 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -750,7 +750,7 @@ static struct dentry *fat_fh_to_dentry(struct super_block *sb,
*/
result = d_obtain_alias(inode);
if (!IS_ERR(result))
- result->d_op = sb->s_root->d_op;
+ d_set_d_op(result, sb->s_root->d_op);
return result;
}

@@ -800,7 +800,7 @@ static struct dentry *fat_get_parent(struct dentry *child)

parent = d_obtain_alias(inode);
if (!IS_ERR(parent))
- parent->d_op = sb->s_root->d_op;
+ d_set_d_op(parent, sb->s_root->d_op);
out:
unlock_super(sb);

diff --git a/fs/fat/namei_msdos.c b/fs/fat/namei_msdos.c
index c5f32db..83ac1ba 100644
--- a/fs/fat/namei_msdos.c
+++ b/fs/fat/namei_msdos.c
@@ -228,10 +228,10 @@ static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry,
}
out:
unlock_super(sb);
- dentry->d_op = &msdos_dentry_operations;
+ d_set_d_op(dentry, &msdos_dentry_operations);
dentry = d_splice_alias(inode, dentry);
if (dentry)
- dentry->d_op = &msdos_dentry_operations;
+ d_set_d_op(dentry, &msdos_dentry_operations);
return dentry;

error:
@@ -674,7 +674,7 @@ static int msdos_fill_super(struct super_block *sb, void *data, int silent)
}

sb->s_flags |= MS_NOATIME;
- sb->s_root->d_op = &msdos_dentry_operations;
+ d_set_d_op(sb->s_root, &msdos_dentry_operations);
unlock_super(sb);
return 0;
}
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index 6e4d02d..b721715 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -766,11 +766,11 @@ static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,

out:
unlock_super(sb);
- dentry->d_op = sb->s_root->d_op;
+ d_set_d_op(dentry, sb->s_root->d_op);
dentry->d_time = dentry->d_parent->d_inode->i_version;
dentry = d_splice_alias(inode, dentry);
if (dentry) {
- dentry->d_op = sb->s_root->d_op;
+ d_set_d_op(dentry, sb->s_root->d_op);
dentry->d_time = dentry->d_parent->d_inode->i_version;
}
return dentry;
@@ -1078,9 +1078,9 @@ static int vfat_fill_super(struct super_block *sb, void *data, int silent)
}

if (MSDOS_SB(sb)->options.name_check != 's')
- sb->s_root->d_op = &vfat_ci_dentry_ops;
+ d_set_d_op(sb->s_root, &vfat_ci_dentry_ops);
else
- sb->s_root->d_op = &vfat_dentry_ops;
+ d_set_d_op(sb->s_root, &vfat_dentry_ops);

unlock_super(sb);
return 0;
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index c9627c9..c9a8a42 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -347,7 +347,7 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
}

entry = newent ? newent : entry;
- entry->d_op = &fuse_dentry_operations;
+ d_set_d_op(entry, &fuse_dentry_operations);
if (outarg_valid)
fuse_change_entry_timeout(entry, &outarg);
else
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 44e0a6c..a8b31da 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -626,7 +626,7 @@ static struct dentry *fuse_get_dentry(struct super_block *sb,

entry = d_obtain_alias(inode);
if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) {
- entry->d_op = &fuse_dentry_operations;
+ d_set_d_op(entry, &fuse_dentry_operations);
fuse_invalidate_entry_cache(entry);
}

@@ -728,7 +728,7 @@ static struct dentry *fuse_get_parent(struct dentry *child)

parent = d_obtain_alias(inode);
if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) {
- parent->d_op = &fuse_dentry_operations;
+ d_set_d_op(parent, &fuse_dentry_operations);
fuse_invalidate_entry_cache(parent);
}

diff --git a/fs/gfs2/export.c b/fs/gfs2/export.c
index 5ab3839..97012ec 100644
--- a/fs/gfs2/export.c
+++ b/fs/gfs2/export.c
@@ -130,7 +130,7 @@ static struct dentry *gfs2_get_parent(struct dentry *child)

dentry = d_obtain_alias(gfs2_lookupi(child->d_inode, &gfs2_qdotdot, 1));
if (!IS_ERR(dentry))
- dentry->d_op = &gfs2_dops;
+ d_set_d_op(dentry, &gfs2_dops);
return dentry;
}

@@ -158,7 +158,7 @@ static struct dentry *gfs2_get_dentry(struct super_block *sb,
out_inode:
dentry = d_obtain_alias(inode);
if (!IS_ERR(dentry))
- dentry->d_op = &gfs2_dops;
+ d_set_d_op(dentry, &gfs2_dops);
return dentry;
}

diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 3eb1393..2aeabd4 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -440,7 +440,7 @@ static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
iput(inode);
return -ENOMEM;
}
- dentry->d_op = &gfs2_dops;
+ d_set_d_op(dentry, &gfs2_dops);
*dptr = dentry;
return 0;
}
diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
index 12cbea7..f28f897 100644
--- a/fs/gfs2/ops_inode.c
+++ b/fs/gfs2/ops_inode.c
@@ -106,7 +106,7 @@ static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
{
struct inode *inode = NULL;

- dentry->d_op = &gfs2_dops;
+ d_set_d_op(dentry, &gfs2_dops);

inode = gfs2_lookupi(dir, &dentry->d_name, 0);
if (inode && IS_ERR(inode))
diff --git a/fs/hfs/dir.c b/fs/hfs/dir.c
index 2b3b861..ea4aefe 100644
--- a/fs/hfs/dir.c
+++ b/fs/hfs/dir.c
@@ -25,7 +25,7 @@ static struct dentry *hfs_lookup(struct inode *dir, struct dentry *dentry,
struct inode *inode = NULL;
int res;

- dentry->d_op = &hfs_dentry_operations;
+ d_set_d_op(dentry, &hfs_dentry_operations);

hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
hfs_cat_build_key(dir->i_sb, fd.search_key, dir->i_ino, &dentry->d_name);
diff --git a/fs/hfs/super.c b/fs/hfs/super.c
index ef4ee57..0bef62a 100644
--- a/fs/hfs/super.c
+++ b/fs/hfs/super.c
@@ -434,7 +434,7 @@ static int hfs_fill_super(struct super_block *sb, void *data, int silent)
if (!sb->s_root)
goto bail_iput;

- sb->s_root->d_op = &hfs_dentry_operations;
+ d_set_d_op(sb->s_root, &hfs_dentry_operations);

/* everything's okay */
return 0;
diff --git a/fs/hfsplus/dir.c b/fs/hfsplus/dir.c
index 9d59c05..ccab871 100644
--- a/fs/hfsplus/dir.c
+++ b/fs/hfsplus/dir.c
@@ -37,7 +37,7 @@ static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry,

sb = dir->i_sb;

- dentry->d_op = &hfsplus_dentry_operations;
+ d_set_d_op(dentry, &hfsplus_dentry_operations);
dentry->d_fsdata = NULL;
hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, &dentry->d_name);
diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index 182e83a..ddf712e 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -419,7 +419,7 @@ static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
err = -ENOMEM;
goto cleanup;
}
- sb->s_root->d_op = &hfsplus_dentry_operations;
+ d_set_d_op(sb->s_root, &hfsplus_dentry_operations);

str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
str.name = HFSP_HIDDENDIR_NAME;
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 861113f..0bc81cf 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -612,7 +612,7 @@ struct dentry *hostfs_lookup(struct inode *ino, struct dentry *dentry,
goto out_put;

d_add(dentry, inode);
- dentry->d_op = &hostfs_dentry_ops;
+ d_set_d_op(dentry, &hostfs_dentry_ops);
return NULL;

out_put:
diff --git a/fs/hpfs/dentry.c b/fs/hpfs/dentry.c
index d7f1cbb..86f573f 100644
--- a/fs/hpfs/dentry.c
+++ b/fs/hpfs/dentry.c
@@ -64,5 +64,5 @@ static const struct dentry_operations hpfs_dentry_operations = {

void hpfs_set_dentry_operations(struct dentry *dentry)
{
- dentry->d_op = &hpfs_dentry_operations;
+ d_set_d_op(dentry, &hpfs_dentry_operations);
}
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 9813d54..dc9505e 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -945,7 +945,7 @@ root_found:
table += 2;
if (opt.check == 'r')
table++;
- s->s_root->d_op = &isofs_dentry_ops[table];
+ d_set_d_op(s->s_root, &isofs_dentry_ops[table]);

kfree(opt.iocharset);

diff --git a/fs/isofs/namei.c b/fs/isofs/namei.c
index e7768ac..2736046 100644
--- a/fs/isofs/namei.c
+++ b/fs/isofs/namei.c
@@ -172,7 +172,7 @@ struct dentry *isofs_lookup(struct inode *dir, struct dentry *dentry, struct nam
struct inode *inode;
struct page *page;

- dentry->d_op = dir->i_sb->s_root->d_op;
+ d_set_d_op(dentry, dir->i_sb->s_root->d_op);

page = alloc_page(GFP_USER);
if (!page)
diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 7166a1b..50d6b8d 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -1466,7 +1466,7 @@ static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struc
jfs_info("jfs_lookup: name = %s", name);

if (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2)
- dentry->d_op = &jfs_ci_dentry_operations;
+ d_set_d_op(dentry, &jfs_ci_dentry_operations);

if ((name[0] == '.') && (len == 1))
inum = dip->i_ino;
@@ -1495,7 +1495,7 @@ static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struc
dentry = d_splice_alias(ip, dentry);

if (dentry && (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2))
- dentry->d_op = &jfs_ci_dentry_operations;
+ d_set_d_op(dentry, &jfs_ci_dentry_operations);

return dentry;
}
diff --git a/fs/jfs/super.c b/fs/jfs/super.c
index b715b0f..3150d76 100644
--- a/fs/jfs/super.c
+++ b/fs/jfs/super.c
@@ -525,7 +525,7 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
goto out_no_root;

if (sbi->mntflag & JFS_OS2)
- sb->s_root->d_op = &jfs_ci_dentry_operations;
+ d_set_d_op(sb->s_root, &jfs_ci_dentry_operations);

/* logical blocks are represented by 40 bits in pxd_t, etc. */
sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
diff --git a/fs/libfs.c b/fs/libfs.c
index 28b3666..889311e 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -59,7 +59,7 @@ struct dentry *simple_lookup(struct inode *dir, struct dentry *dentry, struct na

if (dentry->d_name.len > NAME_MAX)
return ERR_PTR(-ENAMETOOLONG);
- dentry->d_op = &simple_dentry_operations;
+ d_set_d_op(dentry, &simple_dentry_operations);
d_add(dentry, NULL);
return NULL;
}
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index c0d35a3..1b9e077 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -23,7 +23,7 @@ static struct dentry *minix_lookup(struct inode * dir, struct dentry *dentry, st
struct inode * inode = NULL;
ino_t ino;

- dentry->d_op = dir->i_sb->s_root->d_op;
+ d_set_d_op(dentry, dir->i_sb->s_root->d_op);

if (dentry->d_name.len > minix_sb(dir->i_sb)->s_namelen)
return ERR_PTR(-ENAMETOOLONG);
diff --git a/fs/namei.c b/fs/namei.c
index c48d208..717ab13 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -543,6 +543,17 @@ do_revalidate(struct dentry *dentry, struct nameidata *nd)
return dentry;
}

+static inline int need_reval_dot(struct dentry *dentry)
+{
+ if (likely(!(dentry->d_flags & DCACHE_OP_REVALIDATE)))
+ return 0;
+
+ if (likely(!(dentry->d_sb->s_type->fs_flags & FS_REVAL_DOT)))
+ return 0;
+
+ return 1;
+}
+
/*
* force_reval_path - force revalidation of a dentry
*
@@ -566,10 +577,9 @@ force_reval_path(struct path *path, struct nameidata *nd)

/*
* only check on filesystems where it's possible for the dentry to
- * become stale. It's assumed that if this flag is set then the
- * d_revalidate op will also be defined.
+ * become stale.
*/
- if (!(dentry->d_sb->s_type->fs_flags & FS_REVAL_DOT))
+ if (!need_reval_dot(dentry))
return 0;

status = dentry->d_op->d_revalidate(dentry, nd);
@@ -959,7 +969,7 @@ static int do_lookup(struct nameidata *nd, struct qstr *name,
* See if the low-level filesystem might want
* to use its own hash..
*/
- if (parent->d_op && parent->d_op->d_hash) {
+ if (unlikely(parent->d_flags & DCACHE_OP_HASH)) {
int err = parent->d_op->d_hash(parent, nd->inode, name);
if (err < 0)
return err;
@@ -984,7 +994,7 @@ static int do_lookup(struct nameidata *nd, struct qstr *name,
return -ECHILD;

nd->seq = seq;
- if (dentry->d_op && dentry->d_op->d_revalidate) {
+ if (dentry->d_flags & DCACHE_OP_REVALIDATE) {
/* XXX: RCU chokes here */
if (nameidata_dentry_drop_rcu(nd, dentry))
return -ECHILD;
@@ -998,7 +1008,7 @@ static int do_lookup(struct nameidata *nd, struct qstr *name,
if (!dentry)
goto need_lookup;
found:
- if (dentry->d_op && dentry->d_op->d_revalidate)
+ if (dentry->d_flags & DCACHE_OP_REVALIDATE)
goto need_revalidate;
done:
path->mnt = mnt;
@@ -1236,8 +1246,7 @@ return_reval:
* We bypassed the ordinary revalidation routines.
* We may need to check the cached dentry for staleness.
*/
- if (nd->path.dentry && nd->path.dentry->d_sb &&
- (nd->path.dentry->d_sb->s_type->fs_flags & FS_REVAL_DOT)) {
+ if (need_reval_dot(nd->path.dentry)) {
if (try_nameidata_drop_rcu(nd))
return -ECHILD;
err = -ESTALE;
@@ -1543,7 +1552,7 @@ static struct dentry *__lookup_hash(struct qstr *name,
* See if the low-level filesystem might want
* to use its own hash..
*/
- if (base->d_op && base->d_op->d_hash) {
+ if (base->d_flags & DCACHE_OP_HASH) {
err = base->d_op->d_hash(base, inode, name);
dentry = ERR_PTR(err);
if (err < 0)
@@ -1557,7 +1566,7 @@ static struct dentry *__lookup_hash(struct qstr *name,
*/
dentry = d_lookup(base, name);

- if (dentry && dentry->d_op && dentry->d_op->d_revalidate)
+ if (dentry && (dentry->d_flags & DCACHE_OP_REVALIDATE))
dentry = do_revalidate(dentry, nd);

if (!dentry)
@@ -2011,7 +2020,7 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
follow_dotdot(nd);
dir = nd->path.dentry;
case LAST_DOT:
- if (nd->path.mnt->mnt_sb->s_type->fs_flags & FS_REVAL_DOT) {
+ if (need_reval_dot(dir)) {
if (!dir->d_op->d_revalidate(dir, nd)) {
error = -ESTALE;
goto exit;
diff --git a/fs/ncpfs/dir.c b/fs/ncpfs/dir.c
index 6ecc33a..0494dfb 100644
--- a/fs/ncpfs/dir.c
+++ b/fs/ncpfs/dir.c
@@ -655,7 +655,7 @@ ncp_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
entry->ino = iunique(dir->i_sb, 2);
inode = ncp_iget(dir->i_sb, entry);
if (inode) {
- newdent->d_op = &ncp_dentry_operations;
+ d_set_d_op(newdent, &ncp_dentry_operations);
d_instantiate(newdent, inode);
if (!hashed)
d_rehash(newdent);
@@ -911,7 +911,7 @@ static struct dentry *ncp_lookup(struct inode *dir, struct dentry *dentry, struc
if (inode) {
ncp_new_dentry(dentry);
add_entry:
- dentry->d_op = &ncp_dentry_operations;
+ d_set_d_op(dentry, &ncp_dentry_operations);
d_add(dentry, inode);
error = 0;
}
diff --git a/fs/ncpfs/inode.c b/fs/ncpfs/inode.c
index 60047db..0c75a5f 100644
--- a/fs/ncpfs/inode.c
+++ b/fs/ncpfs/inode.c
@@ -717,7 +717,7 @@ static int ncp_fill_super(struct super_block *sb, void *raw_data, int silent)
sb->s_root = d_alloc_root(root_inode);
if (!sb->s_root)
goto out_no_root;
- sb->s_root->d_op = &ncp_root_dentry_operations;
+ d_set_d_op(sb->s_root, &ncp_root_dentry_operations);
return 0;

out_no_root:
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index c03f2d1..2388032 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -443,7 +443,7 @@ void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
if (dentry == NULL)
return;

- dentry->d_op = NFS_PROTO(dir)->dentry_ops;
+ d_set_d_op(dentry, NFS_PROTO(dir)->dentry_ops);
inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr);
if (IS_ERR(inode))
goto out;
@@ -1198,7 +1198,7 @@ static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, stru
if (dentry->d_name.len > NFS_SERVER(dir)->namelen)
goto out;

- dentry->d_op = NFS_PROTO(dir)->dentry_ops;
+ d_set_d_op(dentry, NFS_PROTO(dir)->dentry_ops);

/*
* If we're doing an exclusive create, optimize away the lookup
@@ -1343,7 +1343,7 @@ static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry
res = ERR_PTR(-ENAMETOOLONG);
goto out;
}
- dentry->d_op = NFS_PROTO(dir)->dentry_ops;
+ d_set_d_op(dentry, NFS_PROTO(dir)->dentry_ops);

/* Let vfs_create() deal with O_EXCL. Instantiate, but don't hash
* the dentry. */
diff --git a/fs/nfs/getroot.c b/fs/nfs/getroot.c
index b3e36c3..c3a5a11 100644
--- a/fs/nfs/getroot.c
+++ b/fs/nfs/getroot.c
@@ -121,7 +121,7 @@ struct dentry *nfs_get_root(struct super_block *sb, struct nfs_fh *mntfh)
security_d_instantiate(ret, inode);

if (ret->d_op == NULL)
- ret->d_op = server->nfs_client->rpc_ops->dentry_ops;
+ d_set_d_op(ret, server->nfs_client->rpc_ops->dentry_ops);
out:
nfs_free_fattr(fsinfo.fattr);
return ret;
@@ -228,7 +228,7 @@ struct dentry *nfs4_get_root(struct super_block *sb, struct nfs_fh *mntfh)
security_d_instantiate(ret, inode);

if (ret->d_op == NULL)
- ret->d_op = server->nfs_client->rpc_ops->dentry_ops;
+ d_set_d_op(ret, server->nfs_client->rpc_ops->dentry_ops);

out:
nfs_free_fattr(fattr);
diff --git a/fs/ocfs2/export.c b/fs/ocfs2/export.c
index 19ad145..6adafa5 100644
--- a/fs/ocfs2/export.c
+++ b/fs/ocfs2/export.c
@@ -138,7 +138,7 @@ check_gen:

result = d_obtain_alias(inode);
if (!IS_ERR(result))
- result->d_op = &ocfs2_dentry_ops;
+ d_set_d_op(result, &ocfs2_dentry_ops);
else
mlog_errno(PTR_ERR(result));

@@ -176,7 +176,7 @@ static struct dentry *ocfs2_get_parent(struct dentry *child)

parent = d_obtain_alias(ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0));
if (!IS_ERR(parent))
- parent->d_op = &ocfs2_dentry_ops;
+ d_set_d_op(parent, &ocfs2_dentry_ops);

bail_unlock:
ocfs2_inode_unlock(dir, 0);
diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index ff5744e..d14cad6 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -147,7 +147,7 @@ static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
spin_unlock(&oi->ip_lock);

bail_add:
- dentry->d_op = &ocfs2_dentry_ops;
+ d_set_d_op(dentry, &ocfs2_dentry_ops);
ret = d_splice_alias(inode, dentry);

if (inode) {
@@ -415,7 +415,7 @@ static int ocfs2_mknod(struct inode *dir,
mlog_errno(status);
goto leave;
}
- dentry->d_op = &ocfs2_dentry_ops;
+ d_set_d_op(dentry, &ocfs2_dentry_ops);

status = ocfs2_add_entry(handle, dentry, inode,
OCFS2_I(inode)->ip_blkno, parent_fe_bh,
@@ -743,7 +743,7 @@ static int ocfs2_link(struct dentry *old_dentry,
}

ihold(inode);
- dentry->d_op = &ocfs2_dentry_ops;
+ d_set_d_op(dentry, &ocfs2_dentry_ops);
d_instantiate(dentry, inode);

out_commit:
@@ -1794,7 +1794,7 @@ static int ocfs2_symlink(struct inode *dir,
mlog_errno(status);
goto bail;
}
- dentry->d_op = &ocfs2_dentry_ops;
+ d_set_d_op(dentry, &ocfs2_dentry_ops);

status = ocfs2_add_entry(handle, dentry, inode,
le64_to_cpu(fe->i_blkno), parent_fe_bh,
@@ -2459,7 +2459,7 @@ int ocfs2_mv_orphaned_inode_to_new(struct inode *dir,
goto out_commit;
}

- dentry->d_op = &ocfs2_dentry_ops;
+ d_set_d_op(dentry, &ocfs2_dentry_ops);
d_instantiate(dentry, inode);
status = 0;
out_commit:
diff --git a/fs/pipe.c b/fs/pipe.c
index 4ae1d76..e964d09 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -1004,7 +1004,7 @@ struct file *create_write_pipe(int flags)
goto err_inode;
path.mnt = mntget(pipe_mnt);

- path.dentry->d_op = &pipefs_dentry_operations;
+ d_set_d_op(path.dentry, &pipefs_dentry_operations);
d_instantiate(path.dentry, inode);

err = -ENFILE;
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 866a41a..116d4e9 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1969,7 +1969,7 @@ static struct dentry *proc_fd_instantiate(struct inode *dir,
inode->i_op = &proc_pid_link_inode_operations;
inode->i_size = 64;
ei->op.proc_get_link = proc_fd_link;
- dentry->d_op = &tid_fd_dentry_operations;
+ d_set_d_op(dentry, &tid_fd_dentry_operations);
d_add(dentry, inode);
/* Close the race of the process dying before we return the dentry */
if (tid_fd_revalidate(dentry, NULL))
@@ -2137,7 +2137,7 @@ static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
ei->fd = fd;
inode->i_mode = S_IFREG | S_IRUSR;
inode->i_fop = &proc_fdinfo_file_operations;
- dentry->d_op = &tid_fd_dentry_operations;
+ d_set_d_op(dentry, &tid_fd_dentry_operations);
d_add(dentry, inode);
/* Close the race of the process dying before we return the dentry */
if (tid_fd_revalidate(dentry, NULL))
@@ -2196,7 +2196,7 @@ static struct dentry *proc_pident_instantiate(struct inode *dir,
if (p->fop)
inode->i_fop = p->fop;
ei->op = p->op;
- dentry->d_op = &pid_dentry_operations;
+ d_set_d_op(dentry, &pid_dentry_operations);
d_add(dentry, inode);
/* Close the race of the process dying before we return the dentry */
if (pid_revalidate(dentry, NULL))
@@ -2615,7 +2615,7 @@ static struct dentry *proc_base_instantiate(struct inode *dir,
if (p->fop)
inode->i_fop = p->fop;
ei->op = p->op;
- dentry->d_op = &proc_base_dentry_operations;
+ d_set_d_op(dentry, &proc_base_dentry_operations);
d_add(dentry, inode);
error = NULL;
out:
@@ -2926,7 +2926,7 @@ static struct dentry *proc_pid_instantiate(struct inode *dir,
inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff,
ARRAY_SIZE(tgid_base_stuff));

- dentry->d_op = &pid_dentry_operations;
+ d_set_d_op(dentry, &pid_dentry_operations);

d_add(dentry, inode);
/* Close the race of the process dying before we return the dentry */
@@ -3169,7 +3169,7 @@ static struct dentry *proc_task_instantiate(struct inode *dir,
inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff,
ARRAY_SIZE(tid_base_stuff));

- dentry->d_op = &pid_dentry_operations;
+ d_set_d_op(dentry, &pid_dentry_operations);

d_add(dentry, inode);
/* Close the race of the process dying before we return the dentry */
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index 1d607be..f766be2 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -439,7 +439,7 @@ struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *dir,
out_unlock:

if (inode) {
- dentry->d_op = &proc_dentry_operations;
+ d_set_d_op(dentry, &proc_dentry_operations);
d_add(dentry, inode);
return NULL;
}
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 34f1fc5..a07d7f1 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -120,7 +120,7 @@ static struct dentry *proc_sys_lookup(struct inode *dir, struct dentry *dentry,
goto out;

err = NULL;
- dentry->d_op = &proc_sys_dentry_operations;
+ d_set_d_op(dentry, &proc_sys_dentry_operations);
d_add(dentry, inode);

out:
@@ -201,7 +201,7 @@ static int proc_sys_fill_cache(struct file *filp, void *dirent,
dput(child);
return -ENOMEM;
} else {
- child->d_op = &proc_sys_dentry_operations;
+ d_set_d_op(child, &proc_sys_dentry_operations);
d_add(child, inode);
}
} else {
diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index 5d04a78..e0f0d7e 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -990,7 +990,7 @@ int reiserfs_lookup_privroot(struct super_block *s)
strlen(PRIVROOT_NAME));
if (!IS_ERR(dentry)) {
REISERFS_SB(s)->priv_root = dentry;
- dentry->d_op = &xattr_lookup_poison_ops;
+ d_set_d_op(dentry, &xattr_lookup_poison_ops);
if (dentry->d_inode)
dentry->d_inode->i_flags |= S_PRIVATE;
} else
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 27e1102..3e076ca 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -701,7 +701,7 @@ static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry,
/* instantiate and hash dentry */
ret = d_find_alias(inode);
if (!ret) {
- dentry->d_op = &sysfs_dentry_ops;
+ d_set_d_op(dentry, &sysfs_dentry_ops);
dentry->d_fsdata = sysfs_get(sd);
d_add(dentry, inode);
} else {
diff --git a/fs/sysv/namei.c b/fs/sysv/namei.c
index 7507aeb..b5e68da 100644
--- a/fs/sysv/namei.c
+++ b/fs/sysv/namei.c
@@ -48,7 +48,7 @@ static struct dentry *sysv_lookup(struct inode * dir, struct dentry * dentry, st
struct inode * inode = NULL;
ino_t ino;

- dentry->d_op = dir->i_sb->s_root->d_op;
+ d_set_d_op(dentry, dir->i_sb->s_root->d_op);
if (dentry->d_name.len > SYSV_NAMELEN)
return ERR_PTR(-ENAMETOOLONG);
ino = sysv_inode_by_name(dentry);
diff --git a/fs/sysv/super.c b/fs/sysv/super.c
index 3d9c62b..76712ae 100644
--- a/fs/sysv/super.c
+++ b/fs/sysv/super.c
@@ -346,7 +346,7 @@ static int complete_read_super(struct super_block *sb, int silent, int size)
if (sbi->s_forced_ro)
sb->s_flags |= MS_RDONLY;
if (sbi->s_truncate)
- sb->s_root->d_op = &sysv_dentry_operations;
+ d_set_d_op(sb->s_root, &sysv_dentry_operations);
return 1;
}

diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 2fd0b45..79a89af 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -183,6 +183,11 @@ struct dentry_operations {
#define DCACHE_GENOCIDE 0x0200
#define DCACHE_MOUNTED 0x0400 /* is a mountpoint */

+#define DCACHE_OP_HASH 0x1000
+#define DCACHE_OP_COMPARE 0x2000
+#define DCACHE_OP_REVALIDATE 0x4000
+#define DCACHE_OP_DELETE 0x8000
+

extern spinlock_t dcache_inode_lock;
extern spinlock_t dcache_hash_lock;
@@ -233,6 +238,7 @@ extern void d_instantiate(struct dentry *, struct inode *);
extern struct dentry * d_instantiate_unique(struct dentry *, struct inode *);
extern struct dentry * d_materialise_unique(struct dentry *, struct inode *);
extern void d_delete(struct dentry *);
+extern void d_set_d_op(struct dentry *dentry, const struct dentry_operations *op);

/* allocate/de-allocate */
extern struct dentry * d_alloc(struct dentry *, const struct qstr *);
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 6e34f75..afab372 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2237,7 +2237,7 @@ static int cgroup_create_file(struct dentry *dentry, mode_t mode,
inode->i_size = 0;
inode->i_fop = &cgroup_file_operations;
}
- dentry->d_op = &cgroup_dops;
+ d_set_d_op(dentry, &cgroup_dops);
d_instantiate(dentry, inode);
dget(dentry); /* Extra count - pin the dentry in core */
return 0;
diff --git a/net/socket.c b/net/socket.c
index 425da53..2d8b4c8 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -368,7 +368,7 @@ static int sock_alloc_file(struct socket *sock, struct file **f, int flags)
}
path.mnt = mntget(sock_mnt);

- path.dentry->d_op = &sockfs_dentry_operations;
+ d_set_d_op(path.dentry, &sockfs_dentry_operations);
d_instantiate(path.dentry, SOCK_INODE(sock));
SOCK_INODE(sock)->i_fop = &socket_file_ops;

diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 2899fe2..09f01f4 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -591,7 +591,7 @@ static struct dentry *__rpc_lookup_create(struct dentry *parent,
}
}
if (!dentry->d_inode)
- dentry->d_op = &rpc_dentry_operations;
+ d_set_d_op(dentry, &rpc_dentry_operations);
out_err:
return dentry;
}
--
1.7.1

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