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authorJan Kara <jack@suse.cz>2017-03-15 09:16:27 +0100
committerJan Kara <jack@suse.cz>2017-04-10 17:37:35 +0200
commita242677bb1e6faa9bd82bd33afb2621071258231 (patch)
tree853a675a0c61c182b834b1ced7d7e745c1eb3133 /fs/notify
parent0810b4f9f207910d90aee56d312d25f334796363 (diff)
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fsnotify: Move locking into fsnotify_recalc_mask()
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@redhat.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/notify')
-rw-r--r--fs/notify/dnotify/dnotify.c3
-rw-r--r--fs/notify/fsnotify.h3
-rw-r--r--fs/notify/inode_mark.c18
-rw-r--r--fs/notify/mark.c40
-rw-r--r--fs/notify/vfsmount_mark.c13
5 files changed, 37 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);
}
/*