Revert "fsnotify: store struct file not struct path"

This reverts commit 3bcf3860a4ff9bbc522820b4b765e65e4deceb3e (and the
accompanying commit c1e5c954020e "vfs/fsnotify: fsnotify_close can delay
the final work in fput" that was a horribly ugly hack to make it work at
all).

The 'struct file' approach not only causes that disgusting hack, it
somehow breaks pulseaudio, probably due to some other subtlety with
f_count handling.

Fix up various conflicts due to later fsnotify work.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 29 insertions, 24 deletions

diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index e4e2204187ee..59d0df43ff9d 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -26,18 +26,19 @@ static inline void fsnotify_d_instantiate(struct dentry *dentry,
 }
 
 /* Notify this dentry's parent about a child's events. */
-static inline void fsnotify_parent(struct file *file, struct dentry *dentry, __u32 mask)
+static inline void fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
 {
         if (!dentry)
-                dentry = file->f_path.dentry;
+                dentry = path->dentry;
 
-        __fsnotify_parent(file, dentry, mask);
+        __fsnotify_parent(path, dentry, mask);
 }
 
 /* simple call site for access decisions */
 static inline int fsnotify_perm(struct file *file, int mask)
 {
-        struct inode *inode = file->f_path.dentry->d_inode;
+        struct path *path = &file->f_path;
+        struct inode *inode = path->dentry->d_inode;
         __u32 fsnotify_mask = 0;
 
         if (file->f_mode & FMODE_NONOTIFY)
@@ -51,7 +52,7 @@ static inline int fsnotify_perm(struct file *file, int mask)
         else
                 BUG();
 
-        return fsnotify(inode, fsnotify_mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
+        return fsnotify(inode, fsnotify_mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
 }
 
 /*
@@ -186,15 +187,16 @@ static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
  */
 static inline void fsnotify_access(struct file *file)
 {
-        struct inode *inode = file->f_path.dentry->d_inode;
+        struct path *path = &file->f_path;
+        struct inode *inode = path->dentry->d_inode;
         __u32 mask = FS_ACCESS;
 
         if (S_ISDIR(inode->i_mode))
                 mask |= FS_IN_ISDIR;
 
         if (!(file->f_mode & FMODE_NONOTIFY)) {
-                fsnotify_parent(file, NULL, mask);
-                fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
+                fsnotify_parent(path, NULL, mask);
+                fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
         }
 }
 
@@ -203,15 +205,16 @@ static inline void fsnotify_access(struct file *file)
  */
 static inline void fsnotify_modify(struct file *file)
 {
-        struct inode *inode = file->f_path.dentry->d_inode;
+        struct path *path = &file->f_path;
+        struct inode *inode = path->dentry->d_inode;
         __u32 mask = FS_MODIFY;
 
         if (S_ISDIR(inode->i_mode))
                 mask |= FS_IN_ISDIR;
 
         if (!(file->f_mode & FMODE_NONOTIFY)) {
-                fsnotify_parent(file, NULL, mask);
-                fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
+                fsnotify_parent(path, NULL, mask);
+                fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
         }
 }
 
@@ -220,15 +223,16 @@ static inline void fsnotify_modify(struct file *file)
  */
 static inline void fsnotify_open(struct file *file)
 {
-        struct inode *inode = file->f_path.dentry->d_inode;
+        struct path *path = &file->f_path;
+        struct inode *inode = path->dentry->d_inode;
         __u32 mask = FS_OPEN;
 
         if (S_ISDIR(inode->i_mode))
                 mask |= FS_IN_ISDIR;
 
         if (!(file->f_mode & FMODE_NONOTIFY)) {
-                fsnotify_parent(file, NULL, mask);
-                fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
+                fsnotify_parent(path, NULL, mask);
+                fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
         }
 }
 
@@ -237,6 +241,7 @@ static inline void fsnotify_open(struct file *file)
  */
 static inline void fsnotify_close(struct file *file)
 {
+        struct path *path = &file->f_path;
         struct inode *inode = file->f_path.dentry->d_inode;
         fmode_t mode = file->f_mode;
         __u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE;
@@ -245,8 +250,8 @@ static inline void fsnotify_close(struct file *file)
                 mask |= FS_IN_ISDIR;
 
         if (!(file->f_mode & FMODE_NONOTIFY)) {
-                fsnotify_parent(file, NULL, mask);
-                fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
+                fsnotify_parent(path, NULL, mask);
+                fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
         }
 }
 
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 9bbfd7204b04..ed36fb57c426 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -203,20 +203,20 @@ struct fsnotify_event {
         /* to_tell may ONLY be dereferenced during handle_event(). */
         struct inode *to_tell;  /* either the inode the event happened to or its parent */
         /*
-         * depending on the event type we should have either a file or inode
-         * We hold a reference on file, but NOT on inode.  Since we have the ref on
-         * the file, it may be dereferenced at any point during this object's
+         * depending on the event type we should have either a path or inode
+         * We hold a reference on path, but NOT on inode.  Since we have the ref on
+         * the path, it may be dereferenced at any point during this object's
          * lifetime.  That reference is dropped when this object's refcnt hits
-         * 0.  If this event contains an inode instead of a file, the inode may
+         * 0.  If this event contains an inode instead of a path, the inode may
          * ONLY be used during handle_event().
          */
         union {
-                struct file *file;
+                struct path path;
                 struct inode *inode;
         };
 /* when calling fsnotify tell it if the data is a path or inode */
 #define FSNOTIFY_EVENT_NONE     0
-#define FSNOTIFY_EVENT_FILE     1
+#define FSNOTIFY_EVENT_PATH     1
 #define FSNOTIFY_EVENT_INODE    2
         int data_type;          /* which of the above union we have */
         atomic_t refcnt;        /* how many groups still are using/need to send this event */
@@ -293,7 +293,7 @@ struct fsnotify_mark {
 /* main fsnotify call to send events */
 extern int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
                     const unsigned char *name, u32 cookie);
-extern void __fsnotify_parent(struct file *file, struct dentry *dentry, __u32 mask);
+extern void __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask);
 extern void __fsnotify_inode_delete(struct inode *inode);
 extern void __fsnotify_vfsmount_delete(struct vfsmount *mnt);
 extern u32 fsnotify_get_cookie(void);
@@ -422,7 +422,7 @@ static inline int fsnotify(struct inode *to_tell, __u32 mask, void *data, int da
         return 0;
 }
 
-static inline void __fsnotify_parent(struct file *file, struct dentry *dentry, __u32 mask)
+static inline void __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
 {}
 
 static inline void __fsnotify_inode_delete(struct inode *inode)