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authorAndreas Gruenbacher <agruen@suse.de>2009-12-18 05:24:25 +0300
committerEric Paris <eparis@redhat.com>2010-07-28 17:58:54 +0400
commit35566087099c3ff8901d65ee98af56347ee66e5a (patch)
treee4e56bcf787e5f100fa1ea0138c417e1203b10ae
parentef5e2b785fb3216269e6d0656d38ec286b98dbe5 (diff)
downloadlinux-35566087099c3ff8901d65ee98af56347ee66e5a.tar.xz
fsnotify: take inode->i_lock inside fsnotify_find_mark_entry()
All callers to fsnotify_find_mark_entry() except one take and release inode->i_lock around the call. Take the lock inside fsnotify_find_mark_entry() instead. Signed-off-by: Andreas Gruenbacher <agruen@suse.de> Signed-off-by: Eric Paris <eparis@redhat.com>
-rw-r--r--fs/notify/dnotify/dnotify.c12
-rw-r--r--fs/notify/inode_mark.c26
-rw-r--r--fs/notify/inotify/inotify_fsnotify.c4
-rw-r--r--fs/notify/inotify/inotify_user.c2
-rw-r--r--kernel/audit_tree.c2
-rw-r--r--kernel/audit_watch.c5
6 files changed, 19 insertions, 32 deletions
diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c
index 3efb8b9a572d..cac2eb896639 100644
--- a/fs/notify/dnotify/dnotify.c
+++ b/fs/notify/dnotify/dnotify.c
@@ -95,11 +95,7 @@ static int dnotify_handle_event(struct fsnotify_group *group,
to_tell = event->to_tell;
- spin_lock(&to_tell->i_lock);
fsn_mark = fsnotify_find_mark(group, to_tell);
- spin_unlock(&to_tell->i_lock);
-
- /* unlikely since we alreay passed dnotify_should_send_event() */
if (unlikely(!fsn_mark))
return 0;
dn_mark = container_of(fsn_mark, struct dnotify_mark, fsn_mark);
@@ -147,11 +143,7 @@ static bool dnotify_should_send_event(struct fsnotify_group *group,
if (!S_ISDIR(inode->i_mode))
return false;
- spin_lock(&inode->i_lock);
fsn_mark = fsnotify_find_mark(group, inode);
- spin_unlock(&inode->i_lock);
-
- /* no mark means no dnotify watch */
if (!fsn_mark)
return false;
@@ -201,9 +193,7 @@ void dnotify_flush(struct file *filp, fl_owner_t id)
if (!S_ISDIR(inode->i_mode))
return;
- spin_lock(&inode->i_lock);
fsn_mark = fsnotify_find_mark(dnotify_group, inode);
- spin_unlock(&inode->i_lock);
if (!fsn_mark)
return;
dn_mark = container_of(fsn_mark, struct dnotify_mark, fsn_mark);
@@ -356,9 +346,7 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg)
mutex_lock(&dnotify_mark_mutex);
/* add the new_fsn_mark or find an old one. */
- spin_lock(&inode->i_lock);
fsn_mark = fsnotify_find_mark(dnotify_group, inode);
- spin_unlock(&inode->i_lock);
if (fsn_mark) {
dn_mark = container_of(fsn_mark, struct dnotify_mark, fsn_mark);
spin_lock(&fsn_mark->lock);
diff --git a/fs/notify/inode_mark.c b/fs/notify/inode_mark.c
index 27c1b43ad739..ba6f9833561b 100644
--- a/fs/notify/inode_mark.c
+++ b/fs/notify/inode_mark.c
@@ -261,12 +261,8 @@ void fsnotify_clear_marks_by_inode(struct inode *inode)
}
}
-/*
- * given a group and inode, find the mark associated with that combination.
- * if found take a reference to that mark and return it, else return NULL
- */
-struct fsnotify_mark *fsnotify_find_mark(struct fsnotify_group *group,
- struct inode *inode)
+static struct fsnotify_mark *fsnotify_find_mark_locked(struct fsnotify_group *group,
+ struct inode *inode)
{
struct fsnotify_mark *mark;
struct hlist_node *pos;
@@ -282,6 +278,22 @@ struct fsnotify_mark *fsnotify_find_mark(struct fsnotify_group *group,
return NULL;
}
+/*
+ * given a group and inode, find the mark associated with that combination.
+ * if found take a reference to that mark and return it, else return NULL
+ */
+struct fsnotify_mark *fsnotify_find_mark(struct fsnotify_group *group,
+ struct inode *inode)
+{
+ struct fsnotify_mark *mark;
+
+ spin_lock(&inode->i_lock);
+ mark = fsnotify_find_mark_locked(group, inode);
+ spin_unlock(&inode->i_lock);
+
+ return mark;
+}
+
void fsnotify_duplicate_mark(struct fsnotify_mark *new, struct fsnotify_mark *old)
{
assert_spin_locked(&old->lock);
@@ -349,7 +361,7 @@ int fsnotify_add_mark(struct fsnotify_mark *mark,
spin_lock(&inode->i_lock);
if (!allow_dups)
- lmark = fsnotify_find_mark(group, inode);
+ lmark = fsnotify_find_mark_locked(group, inode);
if (!lmark) {
mark->group = group;
mark->i.inode = inode;
diff --git a/fs/notify/inotify/inotify_fsnotify.c b/fs/notify/inotify/inotify_fsnotify.c
index 12dc72be992e..cc8f6bcbb4a3 100644
--- a/fs/notify/inotify/inotify_fsnotify.c
+++ b/fs/notify/inotify/inotify_fsnotify.c
@@ -97,9 +97,7 @@ static int inotify_handle_event(struct fsnotify_group *group, struct fsnotify_ev
to_tell = event->to_tell;
- spin_lock(&to_tell->i_lock);
fsn_mark = fsnotify_find_mark(group, to_tell);
- spin_unlock(&to_tell->i_lock);
/* race with watch removal? We already passes should_send */
if (unlikely(!fsn_mark))
return 0;
@@ -147,9 +145,7 @@ static bool inotify_should_send_event(struct fsnotify_group *group, struct inode
struct fsnotify_mark *fsn_mark;
bool send;
- spin_lock(&inode->i_lock);
fsn_mark = fsnotify_find_mark(group, inode);
- spin_unlock(&inode->i_lock);
if (!fsn_mark)
return false;
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index 80d102acb86b..ad5a1ea7827e 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -566,9 +566,7 @@ static int inotify_update_existing_watch(struct fsnotify_group *group,
if (unlikely(!mask))
return -EINVAL;
- spin_lock(&inode->i_lock);
fsn_mark = fsnotify_find_mark(group, inode);
- spin_unlock(&inode->i_lock);
if (!fsn_mark)
return -ENOENT;
diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index b20fb055d712..80f8ac328aad 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -360,9 +360,7 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
struct node *p;
int n;
- spin_lock(&inode->i_lock);
old_entry = fsnotify_find_mark(audit_tree_group, inode);
- spin_unlock(&inode->i_lock);
if (!old_entry)
return create_chunk(inode, tree);
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
index 24ecbebf4354..d85fa538a722 100644
--- a/kernel/audit_watch.c
+++ b/kernel/audit_watch.c
@@ -101,10 +101,7 @@ static inline struct audit_parent *audit_find_parent(struct inode *inode)
struct audit_parent *parent = NULL;
struct fsnotify_mark *entry;
- spin_lock(&inode->i_lock);
entry = fsnotify_find_mark(audit_watch_group, inode);
- spin_unlock(&inode->i_lock);
-
if (entry)
parent = container_of(entry, struct audit_parent, mark);
@@ -520,9 +517,7 @@ static bool audit_watch_should_send_event(struct fsnotify_group *group, struct i
struct fsnotify_mark *entry;
bool send;
- spin_lock(&inode->i_lock);
entry = fsnotify_find_mark(group, inode);
- spin_unlock(&inode->i_lock);
if (!entry)
return false;