debugfs: purge obsolete SRCU based removal protection

Purge the SRCU based file removal race protection in favour of the new,
refcount based debugfs_file_get()/debugfs_file_put() API.

Fixes: 49d200deaa68 ("debugfs: prevent access to removed files' private data")
Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 0 insertions, 55 deletions

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index d3a972b45ff0..53f5c9a2af88 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -22,7 +22,6 @@
 #include <linux/slab.h>
 #include <linux/atomic.h>
 #include <linux/device.h>
-#include <linux/srcu.h>
 #include <asm/poll.h>
 
 #include "internal.h"
@@ -48,53 +47,6 @@ const struct file_operations debugfs_noop_file_operations = {
 	.llseek =	noop_llseek,
 };
 
-/**
- * debugfs_use_file_start - mark the beginning of file data access
- * @dentry: the dentry object whose data is being accessed.
- * @srcu_idx: a pointer to some memory to store a SRCU index in.
- *
- * Up to a matching call to debugfs_use_file_finish(), any
- * successive call into the file removing functions debugfs_remove()
- * and debugfs_remove_recursive() will block. Since associated private
- * file data may only get freed after a successful return of any of
- * the removal functions, you may safely access it after a successful
- * call to debugfs_use_file_start() without worrying about
- * lifetime issues.
- *
- * If -%EIO is returned, the file has already been removed and thus,
- * it is not safe to access any of its data. If, on the other hand,
- * it is allowed to access the file data, zero is returned.
- *
- * Regardless of the return code, any call to
- * debugfs_use_file_start() must be followed by a matching call
- * to debugfs_use_file_finish().
- */
-int debugfs_use_file_start(const struct dentry *dentry, int *srcu_idx)
-	__acquires(&debugfs_srcu)
-{
-	*srcu_idx = srcu_read_lock(&debugfs_srcu);
-	barrier();
-	if (d_unlinked(dentry))
-		return -EIO;
-	return 0;
-}
-EXPORT_SYMBOL_GPL(debugfs_use_file_start);
-
-/**
- * debugfs_use_file_finish - mark the end of file data access
- * @srcu_idx: the SRCU index "created" by a former call to
- *            debugfs_use_file_start().
- *
- * Allow any ongoing concurrent call into debugfs_remove() or
- * debugfs_remove_recursive() blocked by a former call to
- * debugfs_use_file_start() to proceed and return to its caller.
- */
-void debugfs_use_file_finish(int srcu_idx) __releases(&debugfs_srcu)
-{
-	srcu_read_unlock(&debugfs_srcu, srcu_idx);
-}
-EXPORT_SYMBOL_GPL(debugfs_use_file_finish);
-
 #define F_DENTRY(filp) ((filp)->f_path.dentry)
 
 const struct file_operations *debugfs_real_fops(const struct file *filp)
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 6449eb935540..f587aded46b5 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -27,14 +27,11 @@
 #include <linux/parser.h>
 #include <linux/magic.h>
 #include <linux/slab.h>
-#include <linux/srcu.h>
 
 #include "internal.h"
 
 #define DEBUGFS_DEFAULT_MODE	0700
 
-DEFINE_SRCU(debugfs_srcu);
-
 static struct vfsmount *debugfs_mount;
 static int debugfs_mount_count;
 static bool debugfs_registered;
@@ -693,8 +690,6 @@ void debugfs_remove(struct dentry *dentry)
 	inode_unlock(d_inode(parent));
 	if (!ret)
 		simple_release_fs(&debugfs_mount, &debugfs_mount_count);
-
-	synchronize_srcu(&debugfs_srcu);
 }
 EXPORT_SYMBOL_GPL(debugfs_remove);
 
@@ -768,8 +763,6 @@ void debugfs_remove_recursive(struct dentry *dentry)
 	if (!__debugfs_remove(child, parent))
 		simple_release_fs(&debugfs_mount, &debugfs_mount_count);
 	inode_unlock(d_inode(parent));
-
-	synchronize_srcu(&debugfs_srcu);
 }
 EXPORT_SYMBOL_GPL(debugfs_remove_recursive);