fsnotify: store struct file not struct path
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>
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index f3c40c0..c2a3029 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -17,9 +17,9 @@
old->data_type == new->data_type &&
old->tgid == new->tgid) {
switch (old->data_type) {
- case (FSNOTIFY_EVENT_PATH):
- if ((old->path.mnt == new->path.mnt) &&
- (old->path.dentry == new->path.dentry))
+ 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))
return true;
case (FSNOTIFY_EVENT_NONE):
return true;
@@ -226,7 +226,7 @@
return false;
/* if we don't have enough info to send an event to userspace say no */
- if (data_type != FSNOTIFY_EVENT_PATH)
+ if (data_type != FSNOTIFY_EVENT_FILE)
return false;
if (mnt)
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 7182c83..50cea74 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -65,7 +65,7 @@
if (client_fd < 0)
return client_fd;
- if (event->data_type != FSNOTIFY_EVENT_PATH) {
+ if (event->data_type != FSNOTIFY_EVENT_FILE) {
WARN_ON(1);
put_unused_fd(client_fd);
return -EINVAL;
@@ -75,8 +75,8 @@
* 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->path.dentry);
- mnt = mntget(event->path.mnt);
+ dentry = dget(event->file->f_path.dentry);
+ mnt = mntget(event->file->f_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 72aae40..4788c86 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -84,7 +84,7 @@
}
/* Notify this dentry's parent about a child's events. */
-void __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
+void __fsnotify_parent(struct file *file, struct dentry *dentry, __u32 mask)
{
struct dentry *parent;
struct inode *p_inode;
@@ -92,7 +92,7 @@
bool should_update_children = false;
if (!dentry)
- dentry = path->dentry;
+ dentry = file->f_path.dentry;
if (!(dentry->d_flags & DCACHE_FSNOTIFY_PARENT_WATCHED))
return;
@@ -124,8 +124,8 @@
* specifies these are events which came from a child. */
mask |= FS_EVENT_ON_CHILD;
- if (path)
- fsnotify(p_inode, mask, path, FSNOTIFY_EVENT_PATH,
+ if (file)
+ fsnotify(p_inode, mask, file, FSNOTIFY_EVENT_FILE,
dentry->d_name.name, 0);
else
fsnotify(p_inode, mask, dentry->d_inode, FSNOTIFY_EVENT_INODE,
@@ -154,10 +154,10 @@
spin_unlock(&inode->i_lock);
}
- if (data_is == FSNOTIFY_EVENT_PATH) {
+ if (data_is == FSNOTIFY_EVENT_FILE) {
struct vfsmount *mnt;
- mnt = ((struct path *)data)->mnt;
+ mnt = ((struct file *)data)->f_path.mnt;
if (mnt && !hlist_empty(&mnt->mnt_fsnotify_marks)) {
spin_lock(&mnt->mnt_root->d_lock);
hlist_for_each_entry(mark, node, &mnt->mnt_fsnotify_marks, m.m_list) {
@@ -228,8 +228,8 @@
!(test_mask & fsnotify_vfsmount_mask))
return 0;
- if (data_is == FSNOTIFY_EVENT_PATH)
- mnt = ((struct path *)data)->mnt;
+ if (data_is == FSNOTIFY_EVENT_FILE)
+ mnt = ((struct file *)data)->f_path.mnt;
/* if this inode's directed listeners don't care and nothing on the vfsmount
* listeners list cares, nothing to do */
diff --git a/fs/notify/inotify/inotify_fsnotify.c b/fs/notify/inotify/inotify_fsnotify.c
index 73a1106..3c506e0 100644
--- a/fs/notify/inotify/inotify_fsnotify.c
+++ b/fs/notify/inotify/inotify_fsnotify.c
@@ -52,9 +52,9 @@
!strcmp(old->file_name, new->file_name))
return true;
break;
- case (FSNOTIFY_EVENT_PATH):
- if ((old->path.mnt == new->path.mnt) &&
- (old->path.dentry == new->path.dentry))
+ 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))
return true;
break;
case (FSNOTIFY_EVENT_NONE):
@@ -165,10 +165,10 @@
send = (fsn_mark->mask & mask);
if (send && (fsn_mark->mask & FS_EXCL_UNLINK) &&
- (data_type == FSNOTIFY_EVENT_PATH)) {
- struct path *path = data;
+ (data_type == FSNOTIFY_EVENT_FILE)) {
+ struct file *file = data;
- if (d_unlinked(path->dentry))
+ if (d_unlinked(file->f_path.dentry))
send = false;
}
diff --git a/fs/notify/notification.c b/fs/notify/notification.c
index f39260f..c106cdd 100644
--- a/fs/notify/notification.c
+++ b/fs/notify/notification.c
@@ -31,6 +31,7 @@
* allocated and used.
*/
+#include <linux/file.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
@@ -89,8 +90,8 @@
if (atomic_dec_and_test(&event->refcnt)) {
pr_debug("%s: event=%p\n", __func__, event);
- if (event->data_type == FSNOTIFY_EVENT_PATH)
- path_put(&event->path);
+ if (event->data_type == FSNOTIFY_EVENT_FILE)
+ fput(event->file);
BUG_ON(!list_empty(&event->private_data_list));
@@ -375,8 +376,8 @@
}
}
event->tgid = get_pid(old_event->tgid);
- if (event->data_type == FSNOTIFY_EVENT_PATH)
- path_get(&event->path);
+ if (event->data_type == FSNOTIFY_EVENT_FILE)
+ get_file(event->file);
return event;
}
@@ -423,11 +424,9 @@
event->data_type = data_type;
switch (data_type) {
- case FSNOTIFY_EVENT_PATH: {
- struct path *path = data;
- event->path.dentry = path->dentry;
- event->path.mnt = path->mnt;
- path_get(&event->path);
+ case FSNOTIFY_EVENT_FILE: {
+ event->file = data;
+ get_file(event->file);
break;
}
case FSNOTIFY_EVENT_INODE:
@@ -435,8 +434,7 @@
break;
case FSNOTIFY_EVENT_NONE:
event->inode = NULL;
- event->path.dentry = NULL;
- event->path.mnt = NULL;
+ event->file = NULL;
break;
default:
BUG();
diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index 59d0df4..e4e2204 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -26,19 +26,18 @@
}
/* Notify this dentry's parent about a child's events. */
-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)
{
if (!dentry)
- dentry = path->dentry;
+ dentry = file->f_path.dentry;
- __fsnotify_parent(path, dentry, mask);
+ __fsnotify_parent(file, dentry, mask);
}
/* simple call site for access decisions */
static inline int fsnotify_perm(struct file *file, int mask)
{
- struct path *path = &file->f_path;
- struct inode *inode = path->dentry->d_inode;
+ struct inode *inode = file->f_path.dentry->d_inode;
__u32 fsnotify_mask = 0;
if (file->f_mode & FMODE_NONOTIFY)
@@ -52,7 +51,7 @@
else
BUG();
- return fsnotify(inode, fsnotify_mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
+ return fsnotify(inode, fsnotify_mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
}
/*
@@ -187,16 +186,15 @@
*/
static inline void fsnotify_access(struct file *file)
{
- struct path *path = &file->f_path;
- struct inode *inode = path->dentry->d_inode;
+ struct inode *inode = file->f_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(path, NULL, mask);
- fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
+ fsnotify_parent(file, NULL, mask);
+ fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
}
}
@@ -205,16 +203,15 @@
*/
static inline void fsnotify_modify(struct file *file)
{
- struct path *path = &file->f_path;
- struct inode *inode = path->dentry->d_inode;
+ struct inode *inode = file->f_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(path, NULL, mask);
- fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
+ fsnotify_parent(file, NULL, mask);
+ fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
}
}
@@ -223,16 +220,15 @@
*/
static inline void fsnotify_open(struct file *file)
{
- struct path *path = &file->f_path;
- struct inode *inode = path->dentry->d_inode;
+ struct inode *inode = file->f_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(path, NULL, mask);
- fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
+ fsnotify_parent(file, NULL, mask);
+ fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
}
}
@@ -241,7 +237,6 @@
*/
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;
@@ -250,8 +245,8 @@
mask |= FS_IN_ISDIR;
if (!(file->f_mode & FMODE_NONOTIFY)) {
- fsnotify_parent(path, NULL, mask);
- fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
+ fsnotify_parent(file, NULL, mask);
+ fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
}
}
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 564b5ea..3410d38 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -223,20 +223,20 @@
/* 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 @@
/* 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 @@
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)
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
index 7499397..b955a22 100644
--- a/kernel/audit_watch.c
+++ b/kernel/audit_watch.c
@@ -545,8 +545,8 @@
return 0;
switch (event->data_type) {
- case (FSNOTIFY_EVENT_PATH):
- inode = event->path.dentry->d_inode;
+ case (FSNOTIFY_EVENT_FILE):
+ inode = event->file->f_path.dentry->d_inode;
break;
case (FSNOTIFY_EVENT_INODE):
inode = event->inode;