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authorAmir Goldstein <amir73il@gmail.com>2018-06-23 17:54:49 +0300
committerJan Kara <jack@suse.cz>2018-06-27 13:45:05 +0200
commit36f10f55ff1d2867bfc48ed898a9cc0dc6b49dd2 (patch)
tree0b7a840c5c8e0b2bd44aeca2c21a144b25d89457 /fs/notify
parentb812a9f5896379b6cff2ac168ddb5b89037d8e78 (diff)
fsnotify: let connector point to an abstract object
Make the code to attach/detach a connector to object more generic by letting the fsnotify connector point to an abstract fsnotify_connp_t. Code that needs to dereference an inode or mount object now uses the helpers fsnotify_conn_{inode,mount}. Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/notify')
-rw-r--r--fs/notify/fdinfo.c8
-rw-r--r--fs/notify/fsnotify.h10
-rw-r--r--fs/notify/mark.c32
3 files changed, 26 insertions, 24 deletions
diff --git a/fs/notify/fdinfo.c b/fs/notify/fdinfo.c
index 10aac1942c9f..86fcf5814279 100644
--- a/fs/notify/fdinfo.c
+++ b/fs/notify/fdinfo.c
@@ -15,7 +15,7 @@
#include <linux/exportfs.h>
#include "inotify/inotify.h"
-#include "../fs/mount.h"
+#include "fsnotify.h"
#if defined(CONFIG_PROC_FS)
@@ -81,7 +81,7 @@ static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
return;
inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
- inode = igrab(mark->connector->inode);
+ inode = igrab(fsnotify_conn_inode(mark->connector));
if (inode) {
/*
* IN_ALL_EVENTS represents all of the mask bits
@@ -117,7 +117,7 @@ static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
mflags |= FAN_MARK_IGNORED_SURV_MODIFY;
if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) {
- inode = igrab(mark->connector->inode);
+ inode = igrab(fsnotify_conn_inode(mark->connector));
if (!inode)
return;
seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
@@ -127,7 +127,7 @@ static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
seq_putc(m, '\n');
iput(inode);
} else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
- struct mount *mnt = real_mount(mark->connector->mnt);
+ struct mount *mnt = fsnotify_conn_mount(mark->connector);
seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
mnt->mnt_id, mflags, mark->mask, mark->ignored_mask);
diff --git a/fs/notify/fsnotify.h b/fs/notify/fsnotify.h
index caeee042d1cc..7902653dd577 100644
--- a/fs/notify/fsnotify.h
+++ b/fs/notify/fsnotify.h
@@ -9,14 +9,16 @@
#include "../mount.h"
-static inline struct inode *fsnotify_obj_inode(fsnotify_connp_t *connp)
+static inline struct inode *fsnotify_conn_inode(
+ struct fsnotify_mark_connector *conn)
{
- return container_of(connp, struct inode, i_fsnotify_marks);
+ return container_of(conn->obj, struct inode, i_fsnotify_marks);
}
-static inline struct mount *fsnotify_obj_mount(fsnotify_connp_t *connp)
+static inline struct mount *fsnotify_conn_mount(
+ struct fsnotify_mark_connector *conn)
{
- return container_of(connp, struct mount, mnt_fsnotify_marks);
+ return container_of(conn->obj, struct mount, mnt_fsnotify_marks);
}
/* destroy all events sitting in this groups notification queue */
diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index 7abb73b5beba..959bc73aaae7 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -120,14 +120,14 @@ static void __fsnotify_recalc_mask(struct fsnotify_mark_connector *conn)
new_mask |= mark->mask;
}
if (conn->type == FSNOTIFY_OBJ_TYPE_INODE)
- conn->inode->i_fsnotify_mask = new_mask;
+ fsnotify_conn_inode(conn)->i_fsnotify_mask = new_mask;
else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT)
- real_mount(conn->mnt)->mnt_fsnotify_mask = new_mask;
+ fsnotify_conn_mount(conn)->mnt_fsnotify_mask = new_mask;
}
/*
* Calculate mask of events for a list of marks. The caller must make sure
- * connector and connector->inode cannot disappear under us. Callers achieve
+ * connector and connector->obj cannot disappear under us. Callers achieve
* this by holding a mark->lock or mark->group->mark_mutex for a mark on this
* list.
*/
@@ -140,7 +140,8 @@ void fsnotify_recalc_mask(struct fsnotify_mark_connector *conn)
__fsnotify_recalc_mask(conn);
spin_unlock(&conn->lock);
if (conn->type == FSNOTIFY_OBJ_TYPE_INODE)
- __fsnotify_update_child_dentry_flags(conn->inode);
+ __fsnotify_update_child_dentry_flags(
+ fsnotify_conn_inode(conn));
}
/* Free all connectors queued for freeing once SRCU period ends */
@@ -166,20 +167,20 @@ static struct inode *fsnotify_detach_connector_from_object(
{
struct inode *inode = NULL;
+ if (conn->type == FSNOTIFY_OBJ_TYPE_DETACHED)
+ return NULL;
+
if (conn->type == FSNOTIFY_OBJ_TYPE_INODE) {
- inode = conn->inode;
- rcu_assign_pointer(inode->i_fsnotify_marks, NULL);
+ inode = fsnotify_conn_inode(conn);
inode->i_fsnotify_mask = 0;
- conn->inode = NULL;
- conn->type = FSNOTIFY_OBJ_TYPE_DETACHED;
} else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
- rcu_assign_pointer(real_mount(conn->mnt)->mnt_fsnotify_marks,
- NULL);
- real_mount(conn->mnt)->mnt_fsnotify_mask = 0;
- conn->mnt = NULL;
- conn->type = FSNOTIFY_OBJ_TYPE_DETACHED;
+ fsnotify_conn_mount(conn)->mnt_fsnotify_mask = 0;
}
+ rcu_assign_pointer(*(conn->obj), NULL);
+ conn->obj = NULL;
+ conn->type = FSNOTIFY_OBJ_TYPE_DETACHED;
+
return inode;
}
@@ -448,10 +449,9 @@ static int fsnotify_attach_connector_to_object(fsnotify_connp_t *connp,
spin_lock_init(&conn->lock);
INIT_HLIST_HEAD(&conn->list);
conn->type = type;
+ conn->obj = connp;
if (conn->type == FSNOTIFY_OBJ_TYPE_INODE)
- inode = conn->inode = igrab(fsnotify_obj_inode(connp));
- else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT)
- conn->mnt = &fsnotify_obj_mount(connp)->mnt;
+ inode = igrab(fsnotify_conn_inode(conn));
/*
* cmpxchg() provides the barrier so that readers of *connp can see
* only initialized structure