linux-kernel - [PATCH 01/15] sysfs: kill SYSFS_FLAG

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Date:	Thu, 20 Sep 2007 16:05:09 +0900
From:	Tejun Heo <htejun@...il.com>
To:	ebiederm@...ssion.com, cornelia.huck@...ibm.com, greg@...ah.com,
	stern@...land.harvard.edu, kay.sievers@...y.org,
	linux-kernel@...r.kernel.org, htejun@...il.com
Cc:	Tejun Heo <htejun@...il.com>
Subject: [PATCH 01/15] sysfs: kill SYSFS_FLAG_REMOVED

With sysfs_get_dentry() simplified, there's no user of
SYSFS_FLAG_REMOVED left.  Kill it.

Signed-off-by: Tejun Heo <htejun@...il.com>
---
This patch reverts driver/sysfs-kill-sysfs_flag_removed.patch and thus
can be removed together with it.

 fs/sysfs/dir.c        |    5 ++++-
 include/linux/sysfs.h |    1 +
 2 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index a493c6f..da4bb66 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -222,7 +222,7 @@ static void sysfs_deactivate(struct sysfs_dirent *sd)
 	DECLARE_COMPLETION_ONSTACK(wait);
 	int v;
 
-	BUG_ON(sd->s_sibling);
+	BUG_ON(sd->s_sibling || !(sd->s_flags & SYSFS_FLAG_REMOVED));
 	sd->s_sibling = (void *)&wait;
 
 	/* atomic_add_return() is a mb(), put_active() will always see
@@ -462,8 +462,11 @@ int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
  */
 void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
 {
+	BUG_ON(sd->s_flags & SYSFS_FLAG_REMOVED);
+
 	sysfs_unlink_sibling(sd);
 
+	sd->s_flags |= SYSFS_FLAG_REMOVED;
 	sd->s_sibling = acxt->removed;
 	acxt->removed = sd;
 
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index 82c31b2..c16e4c5 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -83,6 +83,7 @@ struct sysfs_ops {
 #define SYSFS_COPY_NAME		(SYSFS_DIR | SYSFS_KOBJ_LINK)
 
 #define SYSFS_FLAG_MASK		~SYSFS_TYPE_MASK
+#define SYSFS_FLAG_REMOVED	0x0100
 
 #ifdef CONFIG_SYSFS
 
-- 
1.5.0.3


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