Move locking of locks protecting a list of marks into
fsnotify_recalc_mask(). This reduces code churn in the following patch
which changes the lock protecting the list of marks.
Reviewed-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
fs/notify/dnotify/dnotify.c | 3 +--
fs/notify/fsnotify.h | 3 ---
fs/notify/inode_mark.c | 18 +++---------------
fs/notify/mark.c | 40 ++++++++++++++++++++++++++++++----------
fs/notify/vfsmount_mark.c | 13 +++----------
include/linux/fsnotify_backend.h | 2 ++
6 files changed, 39 insertions(+), 40 deletions(-)
diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c
index 5024729dba23..41b2a070761c 100644
--- a/fs/notify/dnotify/dnotify.c
+++ b/fs/notify/dnotify/dnotify.c
@@ -69,8 +69,7 @@ static void dnotify_recalc_inode_mask(struct fsnotify_mark *fsn_mark)
if (old_mask == new_mask)
return;
- if (fsn_mark->connector)
- fsnotify_recalc_inode_mask(fsn_mark->connector->inode);
+ fsnotify_recalc_mask(fsn_mark->connector);
}
/*
diff --git a/fs/notify/fsnotify.h b/fs/notify/fsnotify.h
index 0354338aad78..96051780d50e 100644
--- a/fs/notify/fsnotify.h
+++ b/fs/notify/fsnotify.h
@@ -14,9 +14,6 @@ extern void fsnotify_flush_notify(struct fsnotify_group *group);
/* protects reads of inode and vfsmount marks list */
extern struct srcu_struct fsnotify_mark_srcu;
-/* Calculate mask of events for a list of marks */
-extern u32 fsnotify_recalc_mask(struct fsnotify_mark_connector *conn);
-
/* compare two groups for sorting of marks lists */
extern int fsnotify_compare_groups(struct fsnotify_group *a,
struct fsnotify_group *b);
diff --git a/fs/notify/inode_mark.c b/fs/notify/inode_mark.c
index 87bef7d802db..9b2f4e6eb8eb 100644
--- a/fs/notify/inode_mark.c
+++ b/fs/notify/inode_mark.c
@@ -30,17 +30,9 @@
#include "../internal.h"
-/*
- * Recalculate the inode->i_fsnotify_mask, or the mask of all FS_* event types
- * any notifier is interested in hearing for this inode.
- */
void fsnotify_recalc_inode_mask(struct inode *inode)
{
- spin_lock(&inode->i_lock);
- inode->i_fsnotify_mask = fsnotify_recalc_mask(inode->i_fsnotify_marks);
- spin_unlock(&inode->i_lock);
-
- __fsnotify_update_child_dentry_flags(inode);
+ fsnotify_recalc_mask(inode->i_fsnotify_marks);
}
struct inode *fsnotify_destroy_inode_mark(struct fsnotify_mark *mark)
@@ -57,14 +49,10 @@ struct inode *fsnotify_destroy_inode_mark(struct fsnotify_mark *mark)
empty = hlist_empty(&mark->connector->list);
mark->connector = NULL;
- /*
- * this mark is now off the inode->i_fsnotify_marks list and we
- * hold the inode->i_lock, so this is the perfect time to update the
- * inode->i_fsnotify_mask
- */
- inode->i_fsnotify_mask = fsnotify_recalc_mask(inode->i_fsnotify_marks);
spin_unlock(&inode->i_lock);
+ fsnotify_recalc_mask(inode->i_fsnotify_marks);
+
return empty ? inode : NULL;
}
diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index b3f83ed6e8be..06faf166c7ae 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -105,18 +105,40 @@ void fsnotify_put_mark(struct fsnotify_mark *mark)
}
}
-/* Calculate mask of events for a list of marks */
-u32 fsnotify_recalc_mask(struct fsnotify_mark_connector *conn)
+static void __fsnotify_recalc_mask(struct fsnotify_mark_connector *conn)
{
u32 new_mask = 0;
struct fsnotify_mark *mark;
- if (!conn)
- return 0;
-
hlist_for_each_entry(mark, &conn->list, obj_list)
new_mask |= mark->mask;
- return new_mask;
+ if (conn->flags & FSNOTIFY_OBJ_TYPE_INODE)
+ conn->inode->i_fsnotify_mask = new_mask;
+ else if (conn->flags & FSNOTIFY_OBJ_TYPE_VFSMOUNT)
+ real_mount(conn->mnt)->mnt_fsnotify_mask = new_mask;
+}
+
+/*
+ * Calculate mask of events for a list of marks. The caller must make sure
+ * connector cannot disappear under us (usually by holding a mark->lock or
+ * mark->group->mark_mutex for a mark on this list).
+ */
+void fsnotify_recalc_mask(struct fsnotify_mark_connector *conn)
+{
+ if (!conn)
+ return;
+
+ if (conn->flags & FSNOTIFY_OBJ_TYPE_INODE)
+ spin_lock(&conn->inode->i_lock);
+ else
+ spin_lock(&conn->mnt->mnt_root->d_lock);
+ __fsnotify_recalc_mask(conn);
+ if (conn->flags & FSNOTIFY_OBJ_TYPE_INODE) {
+ spin_unlock(&conn->inode->i_lock);
+ __fsnotify_update_child_dentry_flags(conn->inode);
+ } else {
+ spin_unlock(&conn->mnt->mnt_root->d_lock);
+ }
}
/*
@@ -423,10 +445,8 @@ int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
if (ret)
goto err;
- if (inode)
- fsnotify_recalc_inode_mask(inode);
- else
- fsnotify_recalc_vfsmount_mask(mnt);
+ if (mark->mask)
+ fsnotify_recalc_mask(mark->connector);
return ret;
err:
diff --git a/fs/notify/vfsmount_mark.c b/fs/notify/vfsmount_mark.c
index 49ccbdb74f82..ffe0d7098cba 100644
--- a/fs/notify/vfsmount_mark.c
+++ b/fs/notify/vfsmount_mark.c
@@ -34,17 +34,9 @@ void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group)
fsnotify_clear_marks_by_group_flags(group, FSNOTIFY_OBJ_TYPE_VFSMOUNT);
}
-/*
- * Recalculate the mnt->mnt_fsnotify_mask, or the mask of all FS_* event types
- * any notifier is interested in hearing for this mount point
- */
void fsnotify_recalc_vfsmount_mask(struct vfsmount *mnt)
{
- struct mount *m = real_mount(mnt);
-
- spin_lock(&mnt->mnt_root->d_lock);
- m->mnt_fsnotify_mask = fsnotify_recalc_mask(m->mnt_fsnotify_marks);
- spin_unlock(&mnt->mnt_root->d_lock);
+ fsnotify_recalc_mask(real_mount(mnt)->mnt_fsnotify_marks);
}
void fsnotify_destroy_vfsmount_mark(struct fsnotify_mark *mark)
@@ -60,8 +52,9 @@ void fsnotify_destroy_vfsmount_mark(struct fsnotify_mark *mark)
hlist_del_init_rcu(&mark->obj_list);
mark->connector = NULL;
- m->mnt_fsnotify_mask = fsnotify_recalc_mask(m->mnt_fsnotify_marks);
spin_unlock(&mnt->mnt_root->d_lock);
+
+ fsnotify_recalc_mask(m->mnt_fsnotify_marks);
}
/*
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 96333fb09309..b954f1b2571c 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -327,6 +327,8 @@ extern struct fsnotify_event *fsnotify_remove_first_event(struct fsnotify_group
/* functions used to manipulate the marks attached to inodes */
+/* Calculate mask of events for a list of marks */
+extern void fsnotify_recalc_mask(struct fsnotify_mark_connector *conn);
/* run all marks associated with a vfsmount and update mnt->mnt_fsnotify_mask */
extern void fsnotify_recalc_vfsmount_mask(struct vfsmount *mnt);
/* run all marks associated with an inode and update inode->i_fsnotify_mask */
--
2.10.2
