d_path: Make get_dcookie() use a struct path argument

get_dcookie() is always called with a dentry and a vfsmount from a struct
path.  Make get_dcookie() take it directly as an argument.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Jan Blunck <jblunck@suse.de>
Acked-by: Christoph Hellwig <hch@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 37 insertions, 48 deletions

diff --git a/arch/powerpc/oprofile/cell/spu_task_sync.c b/arch/powerpc/oprofile/cell/spu_task_sync.c
index 4a890cb42b98..257b13cb18af 100644
--- a/arch/powerpc/oprofile/cell/spu_task_sync.c
+++ b/arch/powerpc/oprofile/cell/spu_task_sync.c
@@ -198,14 +198,13 @@ out:
  * dcookie user still being registered (namely, the reader
  * of the event buffer).
  */
-static inline unsigned long fast_get_dcookie(struct dentry *dentry,
-                                             struct vfsmount *vfsmnt)
+static inline unsigned long fast_get_dcookie(struct path *path)
 {
         unsigned long cookie;
 
-        if (dentry->d_cookie)
-                return (unsigned long)dentry;
-        get_dcookie(dentry, vfsmnt, &cookie);
+        if (path->dentry->d_cookie)
+                return (unsigned long)path->dentry;
+        get_dcookie(path, &cookie);
         return cookie;
 }
 
@@ -240,8 +239,7 @@ get_exec_dcookie_and_offset(struct spu *spu, unsigned int *offsetp,
                         continue;
                 if (!(vma->vm_flags & VM_EXECUTABLE))
                         continue;
-                app_cookie = fast_get_dcookie(vma->vm_file->f_dentry,
-                                          vma->vm_file->f_vfsmnt);
+                app_cookie = fast_get_dcookie(&vma->vm_file->f_path);
                 pr_debug("got dcookie for %s\n",
                          vma->vm_file->f_dentry->d_name.name);
                 app = vma->vm_file;
@@ -262,8 +260,7 @@ get_exec_dcookie_and_offset(struct spu *spu, unsigned int *offsetp,
                 break;
         }
 
-        *spu_bin_dcookie = fast_get_dcookie(vma->vm_file->f_dentry,
-                                                 vma->vm_file->f_vfsmnt);
+        *spu_bin_dcookie = fast_get_dcookie(&vma->vm_file->f_path);
         pr_debug("got dcookie for %s\n", vma->vm_file->f_dentry->d_name.name);
 
         up_read(&mm->mmap_sem);
diff --git a/drivers/oprofile/buffer_sync.c b/drivers/oprofile/buffer_sync.c
index 8134c7e198a5..b07ba2a14119 100644
--- a/drivers/oprofile/buffer_sync.c
+++ b/drivers/oprofile/buffer_sync.c
@@ -187,23 +187,22 @@ void sync_stop(void)
         end_sync();
 }
 
- 
+
 /* Optimisation. We can manage without taking the dcookie sem
  * because we cannot reach this code without at least one
  * dcookie user still being registered (namely, the reader
  * of the event buffer). */
-static inline unsigned long fast_get_dcookie(struct dentry * dentry,
-        struct vfsmount * vfsmnt)
+static inline unsigned long fast_get_dcookie(struct path *path)
 {
         unsigned long cookie;
- 
-        if (dentry->d_cookie)
-                return (unsigned long)dentry;
-        get_dcookie(dentry, vfsmnt, &cookie);
+
+        if (path->dentry->d_cookie)
+                return (unsigned long)path->dentry;
+        get_dcookie(path, &cookie);
         return cookie;
 }
 
- 
+
 /* Look up the dcookie for the task's first VM_EXECUTABLE mapping,
  * which corresponds loosely to "application name". This is
  * not strictly necessary but allows oprofile to associate
@@ -222,8 +221,7 @@ static unsigned long get_exec_dcookie(struct mm_struct * mm)
                         continue;
                 if (!(vma->vm_flags & VM_EXECUTABLE))
                         continue;
-                cookie = fast_get_dcookie(vma->vm_file->f_path.dentry,
-                        vma->vm_file->f_path.mnt);
+                cookie = fast_get_dcookie(&vma->vm_file->f_path);
                 break;
         }
 
@@ -248,8 +246,7 @@ static unsigned long lookup_dcookie(struct mm_struct * mm, unsigned long addr, o
                         continue;
 
                 if (vma->vm_file) {
-                        cookie = fast_get_dcookie(vma->vm_file->f_path.dentry,
-                                vma->vm_file->f_path.mnt);
+                        cookie = fast_get_dcookie(&vma->vm_file->f_path);
                         *offset = (vma->vm_pgoff << PAGE_SHIFT) + addr -
                                 vma->vm_start;
                 } else {
diff --git a/fs/dcookies.c b/fs/dcookies.c
index 792cbf55fa95..13c29f1f711f 100644
--- a/fs/dcookies.c
+++ b/fs/dcookies.c
@@ -24,6 +24,7 @@
 #include <linux/errno.h>
 #include <linux/dcookies.h>
 #include <linux/mutex.h>
+#include <linux/path.h>
 #include <asm/uaccess.h>
 
 /* The dcookies are allocated from a kmem_cache and
@@ -31,8 +32,7 @@
  * code here is particularly performance critical
  */
 struct dcookie_struct {
-        struct dentry * dentry;
-        struct vfsmount * vfsmnt;
+        struct path path;
         struct list_head hash_list;
 };
 
@@ -51,7 +51,7 @@ static inline int is_live(void)
 /* The dentry is locked, its address will do for the cookie */
 static inline unsigned long dcookie_value(struct dcookie_struct * dcs)
 {
-        return (unsigned long)dcs->dentry;
+        return (unsigned long)dcs->path.dentry;
 }
 
 
@@ -89,19 +89,17 @@ static void hash_dcookie(struct dcookie_struct * dcs)
 }
 
 
-static struct dcookie_struct * alloc_dcookie(struct dentry * dentry,
-        struct vfsmount * vfsmnt)
+static struct dcookie_struct *alloc_dcookie(struct path *path)
 {
-        struct dcookie_struct * dcs = kmem_cache_alloc(dcookie_cache, GFP_KERNEL);
+        struct dcookie_struct *dcs = kmem_cache_alloc(dcookie_cache,
+                                                        GFP_KERNEL);
         if (!dcs)
                 return NULL;
 
-        dentry->d_cookie = dcs;
-
-        dcs->dentry = dget(dentry);
-        dcs->vfsmnt = mntget(vfsmnt);
+        path->dentry->d_cookie = dcs;
+        dcs->path = *path;
+        path_get(path);
         hash_dcookie(dcs);
-
         return dcs;
 }
 
@@ -109,8 +107,7 @@ static struct dcookie_struct * alloc_dcookie(struct dentry * dentry,
 /* This is the main kernel-side routine that retrieves the cookie
  * value for a dentry/vfsmnt pair.
  */
-int get_dcookie(struct dentry * dentry, struct vfsmount * vfsmnt,
-        unsigned long * cookie)
+int get_dcookie(struct path *path, unsigned long *cookie)
 {
         int err = 0;
         struct dcookie_struct * dcs;
@@ -122,10 +119,10 @@ int get_dcookie(struct dentry * dentry, struct vfsmount * vfsmnt,
                 goto out;
         }
 
-        dcs = dentry->d_cookie;
+        dcs = path->dentry->d_cookie;
 
         if (!dcs)
-                dcs = alloc_dcookie(dentry, vfsmnt);
+                dcs = alloc_dcookie(path);
 
         if (!dcs) {
                 err = -ENOMEM;
@@ -174,7 +171,7 @@ asmlinkage long sys_lookup_dcookie(u64 cookie64, char __user * buf, size_t len)
                 goto out;
 
         /* FIXME: (deleted) ? */
-        path = d_path(dcs->dentry, dcs->vfsmnt, kbuf, PAGE_SIZE);
+        path = d_path(dcs->path.dentry, dcs->path.mnt, kbuf, PAGE_SIZE);
 
         if (IS_ERR(path)) {
                 err = PTR_ERR(path);
@@ -254,9 +251,8 @@ out_kmem:
 
 static void free_dcookie(struct dcookie_struct * dcs)
 {
-        dcs->dentry->d_cookie = NULL;
-        dput(dcs->dentry);
-        mntput(dcs->vfsmnt);
+        dcs->path.dentry->d_cookie = NULL;
+        path_put(&dcs->path);
         kmem_cache_free(dcookie_cache, dcs);
 }
 
diff --git a/include/linux/dcookies.h b/include/linux/dcookies.h
index 98c69ab80c84..24c806f12a6c 100644
--- a/include/linux/dcookies.h
+++ b/include/linux/dcookies.h
@@ -13,6 +13,7 @@
 #ifdef CONFIG_PROFILING
  
 #include <linux/dcache.h>
+#include <linux/path.h>
 #include <linux/types.h>
  
 struct dcookie_user;
@@ -43,8 +44,7 @@ void dcookie_unregister(struct dcookie_user * user);
  *
  * Returns 0 on success, with *cookie filled in
  */
-int get_dcookie(struct dentry * dentry, struct vfsmount * vfsmnt,
-        unsigned long * cookie);
+int get_dcookie(struct path *path, unsigned long *cookie);
 
 #else
 
@@ -57,13 +57,12 @@ static inline void dcookie_unregister(struct dcookie_user * user)
 {
         return;
 }
- 
-static inline int get_dcookie(struct dentry * dentry,
-        struct vfsmount * vfsmnt, unsigned long * cookie)
+
+static inline int get_dcookie(struct path *path, unsigned long *cookie)
 {
         return -ENOSYS;
-} 
- 
+}
+
 #endif /* CONFIG_PROFILING */
- 
+
 #endif /* DCOOKIES_H */