Currently we initialize mark->group only in fsnotify_add_mark_lock().
However we will need to access fsnotify_ops of corresponding group from
fsnotify_put_mark() so we need mark->group initialized earlier. Do that
in fsnotify_init_mark() which has a consequence that once
fsnotify_init_mark() is called on a mark, the mark has to be destroyed
by fsnotify_put_mark().
Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
fs/notify/dnotify/dnotify.c | 5 ++---
fs/notify/fanotify/fanotify_user.c | 4 ++--
fs/notify/inotify/inotify_user.c | 5 ++---
fs/notify/mark.c | 17 ++++++++++-------
include/linux/fsnotify_backend.h | 12 +++++++-----
kernel/audit_fsnotify.c | 7 ++++---
kernel/audit_tree.c | 15 ++++++++-------
kernel/audit_watch.c | 5 +++--
8 files changed, 38 insertions(+), 32 deletions(-)
diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c
index b77d8d049e4d..f9d500fd7b9a 100644
--- a/fs/notify/dnotify/dnotify.c
+++ b/fs/notify/dnotify/dnotify.c
@@ -305,7 +305,7 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg)
/* set up the new_fsn_mark and new_dn_mark */
new_fsn_mark = &new_dn_mark->fsn_mark;
- fsnotify_init_mark(new_fsn_mark, dnotify_free_mark);
+ fsnotify_init_mark(new_fsn_mark, dnotify_group, dnotify_free_mark);
new_fsn_mark->mask = mask;
new_dn_mark->dn = NULL;
@@ -318,8 +318,7 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg)
dn_mark = container_of(fsn_mark, struct dnotify_mark, fsn_mark);
spin_lock(&fsn_mark->lock);
} else {
- fsnotify_add_mark_locked(new_fsn_mark, dnotify_group, inode,
- NULL, 0);
+ fsnotify_add_mark_locked(new_fsn_mark, inode, NULL, 0);
spin_lock(&new_fsn_mark->lock);
fsn_mark = new_fsn_mark;
dn_mark = new_dn_mark;
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 5a82bbb79f55..d5775f054be7 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -628,8 +628,8 @@ static struct fsnotify_mark *fanotify_add_new_mark(struct fsnotify_group *group,
if (!mark)
return ERR_PTR(-ENOMEM);
- fsnotify_init_mark(mark, fanotify_free_mark);
- ret = fsnotify_add_mark_locked(mark, group, inode, mnt, 0);
+ fsnotify_init_mark(mark, group, fanotify_free_mark);
+ ret = fsnotify_add_mark_locked(mark, inode, mnt, 0);
if (ret) {
fsnotify_put_mark(mark);
return ERR_PTR(ret);
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index a5e4411362f2..07febafd826e 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -558,7 +558,7 @@ static int inotify_new_watch(struct fsnotify_group *group,
if (unlikely(!tmp_i_mark))
return -ENOMEM;
- fsnotify_init_mark(&tmp_i_mark->fsn_mark, inotify_free_mark);
+ fsnotify_init_mark(&tmp_i_mark->fsn_mark, group, inotify_free_mark);
tmp_i_mark->fsn_mark.mask = mask;
tmp_i_mark->wd = -1;
@@ -574,8 +574,7 @@ static int inotify_new_watch(struct fsnotify_group *group,
}
/* we are on the idr, now get on the inode */
- ret = fsnotify_add_mark_locked(&tmp_i_mark->fsn_mark, group, inode,
- NULL, 0);
+ ret = fsnotify_add_mark_locked(&tmp_i_mark->fsn_mark, inode, NULL, 0);
if (ret) {
/* we failed to get on the inode, get off the idr */
inotify_remove_from_idr(group, tmp_i_mark);
diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index d81c031d7b85..ed66a184a3af 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -564,10 +564,10 @@ static int fsnotify_add_mark_list(struct fsnotify_mark *mark,
* These marks may be used for the fsnotify backend to determine which
* event types should be delivered to which group.
*/
-int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
- struct fsnotify_group *group, struct inode *inode,
+int fsnotify_add_mark_locked(struct fsnotify_mark *mark, struct inode *inode,
struct vfsmount *mnt, int allow_dups)
{
+ struct fsnotify_group *group = mark->group;
int ret = 0;
BUG_ON(inode && mnt);
@@ -583,8 +583,6 @@ int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
spin_lock(&mark->lock);
mark->flags |= FSNOTIFY_MARK_FLAG_ALIVE | FSNOTIFY_MARK_FLAG_ATTACHED;
- fsnotify_get_group(group);
- mark->group = group;
list_add(&mark->g_list, &group->marks_list);
atomic_inc(&group->num_marks);
fsnotify_get_mark(mark); /* for g_list */
@@ -609,12 +607,14 @@ int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
return ret;
}
-int fsnotify_add_mark(struct fsnotify_mark *mark, struct fsnotify_group *group,
- struct inode *inode, struct vfsmount *mnt, int allow_dups)
+int fsnotify_add_mark(struct fsnotify_mark *mark, struct inode *inode,
+ struct vfsmount *mnt, int allow_dups)
{
int ret;
+ struct fsnotify_group *group = mark->group;
+
mutex_lock(&group->mark_mutex);
- ret = fsnotify_add_mark_locked(mark, group, inode, mnt, allow_dups);
+ ret = fsnotify_add_mark_locked(mark, inode, mnt, allow_dups);
mutex_unlock(&group->mark_mutex);
return ret;
}
@@ -734,12 +734,15 @@ void fsnotify_destroy_marks(struct fsnotify_mark_connector __rcu **connp)
* Nothing fancy, just initialize lists and locks and counters.
*/
void fsnotify_init_mark(struct fsnotify_mark *mark,
+ struct fsnotify_group *group,
void (*free_mark)(struct fsnotify_mark *mark))
{
memset(mark, 0, sizeof(*mark));
spin_lock_init(&mark->lock);
atomic_set(&mark->refcnt, 1);
mark->free_mark = free_mark;
+ fsnotify_get_group(group);
+ mark->group = group;
}
/*
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 2ef0e04c5a9d..a64518e36bd5 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -340,15 +340,17 @@ extern struct fsnotify_event *fsnotify_remove_first_event(struct fsnotify_group
/* Calculate mask of events for a list of marks */
extern void fsnotify_recalc_mask(struct fsnotify_mark_connector *conn);
-extern void fsnotify_init_mark(struct fsnotify_mark *mark, void (*free_mark)(struct fsnotify_mark *mark));
+extern void fsnotify_init_mark(struct fsnotify_mark *mark,
+ struct fsnotify_group *group,
+ void (*free_mark)(struct fsnotify_mark *mark));
/* Find mark belonging to given group in the list of marks */
extern struct fsnotify_mark *fsnotify_find_mark(
struct fsnotify_mark_connector __rcu **connp,
struct fsnotify_group *group);
-/* attach the mark to both the group and the inode */
-extern int fsnotify_add_mark(struct fsnotify_mark *mark, struct fsnotify_group *group,
- struct inode *inode, struct vfsmount *mnt, int allow_dups);
-extern int fsnotify_add_mark_locked(struct fsnotify_mark *mark, struct fsnotify_group *group,
+/* attach the mark to the inode or vfsmount */
+extern int fsnotify_add_mark(struct fsnotify_mark *mark, struct inode *inode,
+ struct vfsmount *mnt, int allow_dups);
+extern int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
struct inode *inode, struct vfsmount *mnt, int allow_dups);
/* given a group and a mark, flag mark to be freed when all references are dropped */
extern void fsnotify_destroy_mark(struct fsnotify_mark *mark,
diff --git a/kernel/audit_fsnotify.c b/kernel/audit_fsnotify.c
index e8b371ff1e91..2522ceaca758 100644
--- a/kernel/audit_fsnotify.c
+++ b/kernel/audit_fsnotify.c
@@ -103,15 +103,16 @@ struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule, char *pa
goto out;
}
- fsnotify_init_mark(&audit_mark->mark, audit_fsnotify_free_mark);
+ fsnotify_init_mark(&audit_mark->mark, audit_fsnotify_group,
+ audit_fsnotify_free_mark);
audit_mark->mark.mask = AUDIT_FS_EVENTS;
audit_mark->path = pathname;
audit_update_mark(audit_mark, dentry->d_inode);
audit_mark->rule = krule;
- ret = fsnotify_add_mark(&audit_mark->mark, audit_fsnotify_group, inode, NULL, true);
+ ret = fsnotify_add_mark(&audit_mark->mark, inode, NULL, true);
if (ret < 0) {
- audit_fsnotify_mark_free(audit_mark);
+ fsnotify_put_mark(&audit_mark->mark);
audit_mark = ERR_PTR(ret);
}
out:
diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index debf516fe34b..5c1305fd131f 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -154,7 +154,8 @@ static struct audit_chunk *alloc_chunk(int count)
INIT_LIST_HEAD(&chunk->owners[i].list);
chunk->owners[i].index = i;
}
- fsnotify_init_mark(&chunk->mark, audit_tree_destroy_watch);
+ fsnotify_init_mark(&chunk->mark, audit_tree_group,
+ audit_tree_destroy_watch);
chunk->mark.mask = FS_IN_IGNORED;
return chunk;
}
@@ -255,7 +256,7 @@ static void untag_chunk(struct node *p)
spin_unlock(&entry->lock);
mutex_unlock(&entry->group->mark_mutex);
if (new)
- free_chunk(new);
+ fsnotify_put_mark(&new->mark);
goto out;
}
@@ -279,8 +280,8 @@ static void untag_chunk(struct node *p)
if (!new)
goto Fallback;
- if (fsnotify_add_mark_locked(&new->mark, entry->group,
- entry->connector->inode, NULL, 1)) {
+ if (fsnotify_add_mark_locked(&new->mark, entry->connector->inode,
+ NULL, 1)) {
fsnotify_put_mark(&new->mark);
goto Fallback;
}
@@ -345,7 +346,7 @@ static int create_chunk(struct inode *inode, struct audit_tree *tree)
return -ENOMEM;
entry = &chunk->mark;
- if (fsnotify_add_mark(entry, audit_tree_group, inode, NULL, 0)) {
+ if (fsnotify_add_mark(entry, inode, NULL, 0)) {
fsnotify_put_mark(entry);
return -ENOSPC;
}
@@ -417,11 +418,11 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
spin_unlock(&old_entry->lock);
mutex_unlock(&old_entry->group->mark_mutex);
fsnotify_put_mark(old_entry);
- free_chunk(chunk);
+ fsnotify_put_mark(&chunk->mark);
return -ENOENT;
}
- if (fsnotify_add_mark_locked(chunk_entry, old_entry->group,
+ if (fsnotify_add_mark_locked(chunk_entry,
old_entry->connector->inode, NULL, 1)) {
spin_unlock(&old_entry->lock);
mutex_unlock(&old_entry->group->mark_mutex);
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
index 956fa584c239..e32efed86828 100644
--- a/kernel/audit_watch.c
+++ b/kernel/audit_watch.c
@@ -157,9 +157,10 @@ static struct audit_parent *audit_init_parent(struct path *path)
INIT_LIST_HEAD(&parent->watches);
- fsnotify_init_mark(&parent->mark, audit_watch_free_mark);
+ fsnotify_init_mark(&parent->mark, audit_watch_group,
+ audit_watch_free_mark);
parent->mark.mask = AUDIT_FS_WATCH;
- ret = fsnotify_add_mark(&parent->mark, audit_watch_group, inode, NULL, 0);
+ ret = fsnotify_add_mark(&parent->mark, inode, NULL, 0);
if (ret < 0) {
audit_free_parent(parent);
return ERR_PTR(ret);
--
2.10.2
