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authorEric Paris <eparis@redhat.com>2010-07-28 10:18:37 -0400
committerEric Paris <eparis@redhat.com>2010-07-28 10:18:51 -0400
commit3bcf3860a4ff9bbc522820b4b765e65e4deceb3e (patch)
tree1e235af133559062c6fdee840ff9698f1dee26a6 /fs/notify
parentf70ab54cc6c3907b0727ba332b3976f80f3846d0 (diff)
downloadop-kernel-dev-3bcf3860a4ff9bbc522820b4b765e65e4deceb3e.zip
op-kernel-dev-3bcf3860a4ff9bbc522820b4b765e65e4deceb3e.tar.gz
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>
Diffstat (limited to 'fs/notify')
-rw-r--r--fs/notify/fanotify/fanotify.c8
-rw-r--r--fs/notify/fanotify/fanotify_user.c6
-rw-r--r--fs/notify/fsnotify.c16
-rw-r--r--fs/notify/inotify/inotify_fsnotify.c12
-rw-r--r--fs/notify/notification.c20
5 files changed, 30 insertions, 32 deletions
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 @@ 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_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 @@ static bool fanotify_should_send_event(struct fsnotify_group *group, struct inod
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 @@ 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_PATH) {
+ if (event->data_type != FSNOTIFY_EVENT_FILE) {
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->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 @@ void __fsnotify_update_child_dentry_flags(struct inode *inode)
}
/* 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 @@ void __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
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 @@ void __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
* 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 @@ void __fsnotify_flush_ignored_mask(struct inode *inode, void *data, int data_is)
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 @@ int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
!(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 73a1106b..3c506e0 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_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 @@ static bool inotify_should_send_event(struct fsnotify_group *group, struct inode
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 @@ 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_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 @@ struct fsnotify_event *fsnotify_clone_event(struct fsnotify_event *old_event)
}
}
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 @@ struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask,
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 @@ struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask,
break;
case FSNOTIFY_EVENT_NONE:
event->inode = NULL;
- event->path.dentry = NULL;
- event->path.mnt = NULL;
+ event->file = NULL;
break;
default:
BUG();
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