1 files changed, 20 insertions, 5 deletions

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 95c8a9738ca7..b584de33a6a7 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -109,20 +109,24 @@ static int fuse_remount_fs(struct super_block *sb, int *flags, char *data)
         return 0;
 }
 
+static void fuse_truncate(struct address_space *mapping, loff_t offset)
+{
+        /* See vmtruncate() */
+        unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
+        truncate_inode_pages(mapping, offset);
+        unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
+}
+
 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
 {
         struct fuse_conn *fc = get_fuse_conn(inode);
-        if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size)
-                invalidate_mapping_pages(inode->i_mapping, 0, -1);
+        loff_t oldsize;
 
         inode->i_ino     = attr->ino;
         inode->i_mode    = (inode->i_mode & S_IFMT) + (attr->mode & 07777);
         inode->i_nlink   = attr->nlink;
         inode->i_uid     = attr->uid;
         inode->i_gid     = attr->gid;
-        spin_lock(&fc->lock);
-        i_size_write(inode, attr->size);
-        spin_unlock(&fc->lock);
         inode->i_blocks  = attr->blocks;
         inode->i_atime.tv_sec   = attr->atime;
         inode->i_atime.tv_nsec  = attr->atimensec;
@@ -130,6 +134,17 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
         inode->i_mtime.tv_nsec  = attr->mtimensec;
         inode->i_ctime.tv_sec   = attr->ctime;
         inode->i_ctime.tv_nsec  = attr->ctimensec;
+
+        spin_lock(&fc->lock);
+        oldsize = inode->i_size;
+        i_size_write(inode, attr->size);
+        spin_unlock(&fc->lock);
+
+        if (S_ISREG(inode->i_mode) && oldsize != attr->size) {
+                if (attr->size < oldsize)
+                        fuse_truncate(inode->i_mapping, attr->size);
+                invalidate_mapping_pages(inode->i_mapping, 0, -1);
+        }
 }
 
 static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)