[Devel] [PATCH 09/25] sysfs: Move sysfs_get_dentry below __sysfs_get_dentry

[Eric W. Biederman]

sysfs_get_dentry is higher in fs/sysfs/dir.c then is needed and it the
dependencies get simpler if we move it down in the file to where I
have placed __sysfs_get_dentry.  So this patch just moves
sysfs_get_dentry so code movement doesn't get confused with later code
changes. 

Signed-off-by: Eric W. Biederman <ebiederm at xmission.com>
---
 fs/sysfs/dir.c |  196 ++++++++++++++++++++++++++++----------------------------
 1 files changed, 98 insertions(+), 98 deletions(-)

diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 2caa5e0..59a9ce8 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -73,104 +73,6 @@ static void sysfs_unlink_sibling(struct sysfs_dirent *sd)
 }
 
 /**
- *	sysfs_get_dentry - get dentry for the given sysfs_dirent
- *	@sd: sysfs_dirent of interest
- *
- *	Get dentry for @sd.  Dentry is looked up if currently not
- *	present.  This function climbs sysfs_dirent tree till it
- *	reaches a sysfs_dirent with valid dentry attached and descends
- *	down from there looking up dentry for each step.
- *
- *	LOCKING:
- *	Kernel thread context (may sleep)
- *
- *	RETURNS:
- *	Pointer to found dentry on success, ERR_PTR() value on error.
- */
-struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd)
-{
-	struct sysfs_dirent *cur;
-	struct dentry *parent_dentry, *dentry;
-	int i, depth;
-
-	/* Find the first parent which has valid s_dentry and get the
-	 * dentry.
-	 */
-	mutex_lock(&sysfs_mutex);
- restart0:
-	spin_lock(&sysfs_assoc_lock);
- restart1:
-	spin_lock(&dcache_lock);
-
-	dentry = NULL;
-	depth = 0;
-	cur = sd;
-	while (!cur->s_dentry || !cur->s_dentry->d_inode) {
-		if (cur->s_flags & SYSFS_FLAG_REMOVED) {
-			dentry = ERR_PTR(-ENOENT);
-			depth = 0;
-			break;
-		}
-		cur = cur->s_parent;
-		depth++;
-	}
-	if (!IS_ERR(dentry))
-		dentry = dget_locked(cur->s_dentry);
-
-	spin_unlock(&dcache_lock);
-	spin_unlock(&sysfs_assoc_lock);
-
-	/* from the found dentry, look up depth times */
-	while (depth--) {
-		/* find and get depth'th ancestor */
-		for (cur = sd, i = 0; cur && i < depth; i++)
-			cur = cur->s_parent;
-
-		/* This can happen if tree structure was modified due
-		 * to move/rename.  Restart.
-		 */
-		if (i != depth) {
-			dput(dentry);
-			goto restart0;
-		}
-
-		sysfs_get(cur);
-
-		mutex_unlock(&sysfs_mutex);
-
-		/* look it up */
-		parent_dentry = dentry;
-		dentry = lookup_one_len_kern(cur->s_name, parent_dentry,
-					     strlen(cur->s_name));
-		dput(parent_dentry);
-
-		if (IS_ERR(dentry)) {
-			sysfs_put(cur);
-			return dentry;
-		}
-
-		mutex_lock(&sysfs_mutex);
-		spin_lock(&sysfs_assoc_lock);
-
-		/* This, again, can happen if tree structure has
-		 * changed and we looked up the wrong thing.  Restart.
-		 */
-		if (cur->s_dentry != dentry) {
-			dput(dentry);
-			sysfs_put(cur);
-			goto restart1;
-		}
-
-		spin_unlock(&sysfs_assoc_lock);
-
-		sysfs_put(cur);
-	}
-
-	mutex_unlock(&sysfs_mutex);
-	return dentry;
-}
-
-/**
  *	sysfs_get_active - get an active reference to sysfs_dirent
  *	@sd: sysfs_dirent to get an active reference to
  *
@@ -886,6 +788,104 @@ static struct dentry *__sysfs_get_dentry(struct super_block *sb, struct sysfs_di
 	return dentry;
 }
 
+/**
+ *	sysfs_get_dentry - get dentry for the given sysfs_dirent
+ *	@sd: sysfs_dirent of interest
+ *
+ *	Get dentry for @sd.  Dentry is looked up if currently not
+ *	present.  This function climbs sysfs_dirent tree till it
+ *	reaches a sysfs_dirent with valid dentry attached and descends
+ *	down from there looking up dentry for each step.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	Pointer to found dentry on success, ERR_PTR() value on error.
+ */
+struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd)
+{
+	struct sysfs_dirent *cur;
+	struct dentry *parent_dentry, *dentry;
+	int i, depth;
+
+	/* Find the first parent which has valid s_dentry and get the
+	 * dentry.
+	 */
+	mutex_lock(&sysfs_mutex);
+ restart0:
+	spin_lock(&sysfs_assoc_lock);
+ restart1:
+	spin_lock(&dcache_lock);
+
+	dentry = NULL;
+	depth = 0;
+	cur = sd;
+	while (!cur->s_dentry || !cur->s_dentry->d_inode) {
+		if (cur->s_flags & SYSFS_FLAG_REMOVED) {
+			dentry = ERR_PTR(-ENOENT);
+			depth = 0;
+			break;
+		}
+		cur = cur->s_parent;
+		depth++;
+	}
+	if (!IS_ERR(dentry))
+		dentry = dget_locked(cur->s_dentry);
+
+	spin_unlock(&dcache_lock);
+	spin_unlock(&sysfs_assoc_lock);
+
+	/* from the found dentry, look up depth times */
+	while (depth--) {
+		/* find and get depth'th ancestor */
+		for (cur = sd, i = 0; cur && i < depth; i++)
+			cur = cur->s_parent;
+
+		/* This can happen if tree structure was modified due
+		 * to move/rename.  Restart.
+		 */
+		if (i != depth) {
+			dput(dentry);
+			goto restart0;
+		}
+
+		sysfs_get(cur);
+
+		mutex_unlock(&sysfs_mutex);
+
+		/* look it up */
+		parent_dentry = dentry;
+		dentry = lookup_one_len_kern(cur->s_name, parent_dentry,
+					     strlen(cur->s_name));
+		dput(parent_dentry);
+
+		if (IS_ERR(dentry)) {
+			sysfs_put(cur);
+			return dentry;
+		}
+
+		mutex_lock(&sysfs_mutex);
+		spin_lock(&sysfs_assoc_lock);
+
+		/* This, again, can happen if tree structure has
+		 * changed and we looked up the wrong thing.  Restart.
+		 */
+		if (cur->s_dentry != dentry) {
+			dput(dentry);
+			sysfs_put(cur);
+			goto restart1;
+		}
+
+		spin_unlock(&sysfs_assoc_lock);
+
+		sysfs_put(cur);
+	}
+
+	mutex_unlock(&sysfs_mutex);
+	return dentry;
+}
+
 int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
 {
 	struct sysfs_dirent *sd;
-- 
1.5.1.1.181.g2de0

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