[PATCH] fuse: fix hang on SMP

[powerpc.git] / fs / fuse / dir.c

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 8605155..a8f65c1 100644 (file)
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -935,14 +935,30 @@ static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
        }
 }
 
+static void fuse_vmtruncate(struct inode *inode, loff_t offset)
+{
+       struct fuse_conn *fc = get_fuse_conn(inode);
+       int need_trunc;
+
+       spin_lock(&fc->lock);
+       need_trunc = inode->i_size > offset;
+       i_size_write(inode, offset);
+       spin_unlock(&fc->lock);
+
+       if (need_trunc) {
+               struct address_space *mapping = inode->i_mapping;
+               unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
+               truncate_inode_pages(mapping, offset);
+       }
+}
+
 /*
  * Set attributes, and at the same time refresh them.
  *
  * Truncation is slightly complicated, because the 'truncate' request
  * may fail, in which case we don't want to touch the mapping.
- * vmtruncate() doesn't allow for this case.  So do the rlimit
- * checking by hand and call vmtruncate() only after the file has
- * actually been truncated.
+ * vmtruncate() doesn't allow for this case, so do the rlimit checking
+ * and the actual truncation by hand.
  */
 static int fuse_setattr(struct dentry *entry, struct iattr *attr)
 {
@@ -993,12 +1009,8 @@ static int fuse_setattr(struct dentry *entry, struct iattr *attr)
                        make_bad_inode(inode);
                        err = -EIO;
                } else {
-                       if (is_truncate) {
-                               loff_t origsize = i_size_read(inode);
-                               i_size_write(inode, outarg.attr.size);
-                               if (origsize > outarg.attr.size)
-                                       vmtruncate(inode, outarg.attr.size);
-                       }
+                       if (is_truncate)
+                               fuse_vmtruncate(inode, outarg.attr.size);
                        fuse_change_attributes(inode, &outarg.attr);
                        fi->i_time = time_to_jiffies(outarg.attr_valid,
                                                     outarg.attr_valid_nsec);