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>

5 files changed, 30 insertions, 41 deletions

diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index eb8f73c9c131..756566fe8449 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -17,9 +17,9 @@ static bool should_merge(struct fsnotify_event *old, struct fsnotify_event *new)
             old->data_type == new->data_type &&
             old->tgid == new->tgid) {
                 switch (old->data_type) {
-                case (FSNOTIFY_EVENT_FILE):
-                        if ((old->file->f_path.mnt == new->file->f_path.mnt) &&
-                            (old->file->f_path.dentry == new->file->f_path.dentry))
+                case (FSNOTIFY_EVENT_PATH):
+                        if ((old->path.mnt == new->path.mnt) &&
+                            (old->path.dentry == new->path.dentry))
                                 return true;
                 case (FSNOTIFY_EVENT_NONE):
                         return true;
@@ -174,7 +174,7 @@ static bool fanotify_should_send_event(struct fsnotify_group *group,
                 return false;
 
         /* if we don't have enough info to send an event to userspace say no */
-        if (data_type != FSNOTIFY_EVENT_FILE)
+        if (data_type != FSNOTIFY_EVENT_PATH)
                 return false;
 
         if (inode_mark && vfsmnt_mark) {
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 25a3b4dfcf61..032b837fcd11 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -65,7 +65,7 @@ static int create_fd(struct fsnotify_group *group, struct fsnotify_event *event)
         if (client_fd < 0)
                 return client_fd;
 
-        if (event->data_type != FSNOTIFY_EVENT_FILE) {
+        if (event->data_type != FSNOTIFY_EVENT_PATH) {
                 WARN_ON(1);
                 put_unused_fd(client_fd);
                 return -EINVAL;
@@ -75,8 +75,8 @@ static int create_fd(struct fsnotify_group *group, struct fsnotify_event *event)
          * we need a new file handle for the userspace program so it can read even if it was
          * originally opened O_WRONLY.
          */
-        dentry = dget(event->file->f_path.dentry);
-        mnt = mntget(event->file->f_path.mnt);
+        dentry = dget(event->path.dentry);
+        mnt = mntget(event->path.mnt);
         /* it's possible this event was an overflow event.  in that case dentry and mnt
          * are NULL;  That's fine, just don't call dentry open */
         if (dentry && mnt)
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index 4d2a82c1ceb1..3970392b2722 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -84,7 +84,7 @@ void __fsnotify_update_child_dentry_flags(struct inode *inode)
 }
 
 /* Notify this dentry's parent about a child's events. */
-void __fsnotify_parent(struct file *file, struct dentry *dentry, __u32 mask)
+void __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
 {
         struct dentry *parent;
         struct inode *p_inode;
@@ -92,7 +92,7 @@ void __fsnotify_parent(struct file *file, struct dentry *dentry, __u32 mask)
         bool should_update_children = false;
 
         if (!dentry)
-                dentry = file->f_path.dentry;
+                dentry = path->dentry;
 
         if (!(dentry->d_flags & DCACHE_FSNOTIFY_PARENT_WATCHED))
                 return;
@@ -124,8 +124,8 @@ void __fsnotify_parent(struct file *file, struct dentry *dentry, __u32 mask)
                  * specifies these are events which came from a child. */
                 mask |= FS_EVENT_ON_CHILD;
 
-                if (file)
-                        fsnotify(p_inode, mask, file, FSNOTIFY_EVENT_FILE,
+                if (path)
+                        fsnotify(p_inode, mask, path, FSNOTIFY_EVENT_PATH,
                                  dentry->d_name.name, 0);
                 else
                         fsnotify(p_inode, mask, dentry->d_inode, FSNOTIFY_EVENT_INODE,
@@ -217,8 +217,8 @@ int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
         /* global tests shouldn't care about events on child only the specific event */
         __u32 test_mask = (mask & ~FS_EVENT_ON_CHILD);
 
-        if (data_is == FSNOTIFY_EVENT_FILE)
-                mnt = ((struct file *)data)->f_path.mnt;
+        if (data_is == FSNOTIFY_EVENT_PATH)
+                mnt = ((struct path *)data)->mnt;
         else
                 mnt = NULL;
 
diff --git a/fs/notify/inotify/inotify_fsnotify.c b/fs/notify/inotify/inotify_fsnotify.c
index 5e73eeb2c697..a91b69a6a291 100644
--- a/fs/notify/inotify/inotify_fsnotify.c
+++ b/fs/notify/inotify/inotify_fsnotify.c
@@ -52,9 +52,9 @@ static bool event_compare(struct fsnotify_event *old, struct fsnotify_event *new
                             !strcmp(old->file_name, new->file_name))
                                 return true;
                         break;
-                case (FSNOTIFY_EVENT_FILE):
-                        if ((old->file->f_path.mnt == new->file->f_path.mnt) &&
-                            (old->file->f_path.dentry == new->file->f_path.dentry))
+                case (FSNOTIFY_EVENT_PATH):
+                        if ((old->path.mnt == new->path.mnt) &&
+                            (old->path.dentry == new->path.dentry))
                                 return true;
                         break;
                 case (FSNOTIFY_EVENT_NONE):
@@ -147,10 +147,10 @@ static bool inotify_should_send_event(struct fsnotify_group *group, struct inode
                                       __u32 mask, void *data, int data_type)
 {
         if ((inode_mark->mask & FS_EXCL_UNLINK) &&
-            (data_type == FSNOTIFY_EVENT_FILE)) {
-                struct file *file  = data;
+            (data_type == FSNOTIFY_EVENT_PATH)) {
+                struct path *path = data;
 
-                if (d_unlinked(file->f_path.dentry))
+                if (d_unlinked(path->dentry))
                         return false;
         }
 
diff --git a/fs/notify/notification.c b/fs/notify/notification.c
index d6c435adc7a2..f39260f8f865 100644
--- a/fs/notify/notification.c
+++ b/fs/notify/notification.c
@@ -31,7 +31,6 @@
  * allocated and used.
  */
 
-#include <linux/file.h>
 #include <linux/fs.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
@@ -90,8 +89,8 @@ void fsnotify_put_event(struct fsnotify_event *event)
         if (atomic_dec_and_test(&event->refcnt)) {
                 pr_debug("%s: event=%p\n", __func__, event);
 
-                if (event->data_type == FSNOTIFY_EVENT_FILE)
-                        fput(event->file);
+                if (event->data_type == FSNOTIFY_EVENT_PATH)
+                        path_put(&event->path);
 
                 BUG_ON(!list_empty(&event->private_data_list));
 
@@ -376,8 +375,8 @@ struct fsnotify_event *fsnotify_clone_event(struct fsnotify_event *old_event)
                 }
         }
         event->tgid = get_pid(old_event->tgid);
-        if (event->data_type == FSNOTIFY_EVENT_FILE)
-                get_file(event->file);
+        if (event->data_type == FSNOTIFY_EVENT_PATH)
+                path_get(&event->path);
 
         return event;
 }
@@ -424,22 +423,11 @@ struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask,
         event->data_type = data_type;
 
         switch (data_type) {
-        case FSNOTIFY_EVENT_FILE: {
-                event->file = data;
-                /*
-                 * if this file is about to disappear hold an extra reference
-                 * until we return to __fput so we don't have to worry about
-                 * future get/put destroying the file under us or generating
-                 * additional events.  Notice that we change f_mode without
-                 * holding f_lock.  This is safe since this is the only possible
-                 * reference to this object in the kernel (it was about to be
-                 * freed, remember?)
-                 */
-                if (!atomic_long_read(&event->file->f_count)) {
-                        event->file->f_mode |= FMODE_NONOTIFY;
-                        get_file(event->file);
-                }
-                get_file(event->file);
+        case FSNOTIFY_EVENT_PATH: {
+                struct path *path = data;
+                event->path.dentry = path->dentry;
+                event->path.mnt = path->mnt;
+                path_get(&event->path);
                 break;
         }
         case FSNOTIFY_EVENT_INODE:
@@ -447,7 +435,8 @@ struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask,
                 break;
         case FSNOTIFY_EVENT_NONE:
                 event->inode = NULL;
-                event->file = NULL;
+                event->path.dentry = NULL;
+                event->path.mnt = NULL;
                 break;
         default:
                 BUG();