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Revert "fsnotify: store struct file not struct path"

Browse source 
This reverts commit 3bcf3860a4 (and the
accompanying commit c1e5c95402 "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>
This commit is contained in:
Linus Torvalds 2010-08-12 14:23:04 -07:00
parent ad41a1e0ca
commit 2069601b3f
9 changed files with 61 additions and 76 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
fs/file_table.c
View file

@ -230,15 +230,6 @@ static void __fput(struct file *file)
might_sleep();
fsnotify_close(file);
/*
* fsnotify_create_event may have taken one or more references on this
* file. If it did so it left one reference for us to drop to make sure
* its calls to fput could not prematurely destroy the file.
*/
if (atomic_long_read(&file->f_count))
return fput(file);
/*
* The function eventpoll_release() should be the first called
* in the file cleanup chain.

8
fs/notify/fanotify/fanotify.c
View file

@ -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) {

6
fs/notify/fanotify/fanotify_user.c
View file

@ -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)

12
fs/notify/fsnotify.c
View file

@ -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;

12
fs/notify/inotify/inotify_fsnotify.c
View file

@ -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;
}

33
fs/notify/notification.c
View file

@ -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();

37
include/linux/fsnotify.h
View file

@ -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);
}
}

16
include/linux/fsnotify_backend.h
View file

@ -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)

4
kernel/audit_watch.c
View file

@ -526,8 +526,8 @@ static int audit_watch_handle_event(struct fsnotify_group *group,
BUG_ON(group != audit_watch_group);
switch (event->data_type) {
case (FSNOTIFY_EVENT_FILE):
inode = event->file->f_path.dentry->d_inode;
case (FSNOTIFY_EVENT_PATH):
inode = event->path.dentry->d_inode;
break;
case (FSNOTIFY_EVENT_INODE):
inode = event->inode;