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fsnotify: store struct file not struct path

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Al explains that calling dentry_open() with a mnt/dentry pair is only
garunteed to be safe if they are already used in an open struct file.  To
make sure this is the case don't store and use a struct path in fsnotify,
always use a struct file.

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris 2010-07-28 10:18:37 -04:00
parent f70ab54cc6
commit 3bcf3860a4
8 changed files with 56 additions and 63 deletions
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16
include/linux/fsnotify_backend.h
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@ -223,20 +223,20 @@ 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 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
* 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
* lifetime. That reference is dropped when this object's refcnt hits
* 0. If this event contains an inode instead of a path, the inode may
* 0. If this event contains an inode instead of a file, the inode may
* ONLY be used during handle_event().
*/
union {
struct path path;
struct file *file;
struct inode *inode;
};
/* when calling fsnotify tell it if the data is a path or inode */
#define FSNOTIFY_EVENT_NONE 0
#define FSNOTIFY_EVENT_PATH 1
#define FSNOTIFY_EVENT_FILE 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 */
@ -311,7 +311,7 @@ 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 path *path, struct dentry *dentry, __u32 mask);
extern void __fsnotify_parent(struct file *file, 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);
@ -444,7 +444,7 @@ static inline int fsnotify(struct inode *to_tell, __u32 mask, void *data, int da
return 0;
}
static inline void __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
static inline void __fsnotify_parent(struct file *file, struct dentry *dentry, __u32 mask)
{}
static inline void __fsnotify_inode_delete(struct inode *inode)