fanotify: put duplicate code for adding vfsmount/inode marks into an own function

The code under the groups mark_mutex in fanotify_add_inode_mark() and
fanotify_add_vfsmount_mark() is almost identical.  So put it into a
seperate function.

Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
Cc: Eric Paris <eparis@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 35 insertions, 36 deletions

diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 4e1d8ec77b04..e44cb6427df3 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -600,33 +600,45 @@ static __u32 fanotify_mark_add_to_mask(struct fsnotify_mark *fsn_mark,
         return mask & ~oldmask;
 }
 
+static struct fsnotify_mark *fanotify_add_new_mark(struct fsnotify_group *group,
+                                                   struct inode *inode,
+                                                   struct vfsmount *mnt)
+{
+        struct fsnotify_mark *mark;
+        int ret;
+
+        if (atomic_read(&group->num_marks) > group->fanotify_data.max_marks)
+                return ERR_PTR(-ENOSPC);
+
+        mark = kmem_cache_alloc(fanotify_mark_cache, GFP_KERNEL);
+        if (!mark)
+                return ERR_PTR(-ENOMEM);
+
+        fsnotify_init_mark(mark, fanotify_free_mark);
+        ret = fsnotify_add_mark_locked(mark, group, inode, mnt, 0);
+        if (ret) {
+                fsnotify_put_mark(mark);
+                return ERR_PTR(ret);
+        }
+
+        return mark;
+}
+
+
 static int fanotify_add_vfsmount_mark(struct fsnotify_group *group,
                                       struct vfsmount *mnt, __u32 mask,
                                       unsigned int flags)
 {
         struct fsnotify_mark *fsn_mark;
         __u32 added;
-        int ret = 0;
 
         mutex_lock(&group->mark_mutex);
         fsn_mark = fsnotify_find_vfsmount_mark(group, mnt);
         if (!fsn_mark) {
-                if (atomic_read(&group->num_marks) > group->fanotify_data.max_marks) {
-                        mutex_unlock(&group->mark_mutex);
-                        return -ENOSPC;
-                }
-
-                fsn_mark = kmem_cache_alloc(fanotify_mark_cache, GFP_KERNEL);
-                if (!fsn_mark) {
-                        mutex_unlock(&group->mark_mutex);
-                        return -ENOMEM;
-                }
-
-                fsnotify_init_mark(fsn_mark, fanotify_free_mark);
-                ret = fsnotify_add_mark_locked(fsn_mark, group, NULL, mnt, 0);
-                if (ret) {
+                fsn_mark = fanotify_add_new_mark(group, NULL, mnt);
+                if (IS_ERR(fsn_mark)) {
                         mutex_unlock(&group->mark_mutex);
-                        goto err;
+                        return PTR_ERR(fsn_mark);
                 }
         }
         added = fanotify_mark_add_to_mask(fsn_mark, mask, flags);
@@ -634,9 +646,9 @@ static int fanotify_add_vfsmount_mark(struct fsnotify_group *group,
 
         if (added & ~real_mount(mnt)->mnt_fsnotify_mask)
                 fsnotify_recalc_vfsmount_mask(mnt);
-err:
+
         fsnotify_put_mark(fsn_mark);
-        return ret;
+        return 0;
 }
 
 static int fanotify_add_inode_mark(struct fsnotify_group *group,
@@ -645,7 +657,6 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group,
 {
         struct fsnotify_mark *fsn_mark;
         __u32 added;
-        int ret = 0;
 
         pr_debug("%s: group=%p inode=%p\n", __func__, group, inode);
 
@@ -662,22 +673,10 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group,
         mutex_lock(&group->mark_mutex);
         fsn_mark = fsnotify_find_inode_mark(group, inode);
         if (!fsn_mark) {
-                if (atomic_read(&group->num_marks) > group->fanotify_data.max_marks) {
+                fsn_mark = fanotify_add_new_mark(group, inode, NULL);
+                if (IS_ERR(fsn_mark)) {
                         mutex_unlock(&group->mark_mutex);
-                        return -ENOSPC;
-                }
-
-                fsn_mark = kmem_cache_alloc(fanotify_mark_cache, GFP_KERNEL);
-                if (!fsn_mark) {
-                        mutex_unlock(&group->mark_mutex);
-                        return -ENOMEM;
-                }
-
-                fsnotify_init_mark(fsn_mark, fanotify_free_mark);
-                ret = fsnotify_add_mark_locked(fsn_mark, group, inode, NULL, 0);
-                if (ret) {
-                        mutex_unlock(&group->mark_mutex);
-                        goto err;
+                        return PTR_ERR(fsn_mark);
                 }
         }
         added = fanotify_mark_add_to_mask(fsn_mark, mask, flags);
@@ -685,9 +684,9 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group,
 
         if (added & ~inode->i_fsnotify_mask)
                 fsnotify_recalc_inode_mask(inode);
-err:
+
         fsnotify_put_mark(fsn_mark);
-        return ret;
+        return 0;
 }
 
 /* fanotify syscalls */