f2fs: fix to truncate blocks past EOF in ->setattr

By using FALLOC_FL_KEEP_SIZE in ->fallocate of f2fs, we can fallocate block past
EOF without changing i_size of inode. These blocks past EOF will not be
truncated in ->setattr as we truncate them only when change the file size.

We should give a chance to truncate blocks out of filesize in setattr().

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 12 insertions, 5 deletions

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index a041c66fd611..a95ba23e3bd3 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -560,15 +560,22 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
         if (err)
                 return err;
 
-        if ((attr->ia_valid & ATTR_SIZE) &&
-                        attr->ia_size != i_size_read(inode)) {
+        if (attr->ia_valid & ATTR_SIZE) {
                 err = f2fs_convert_inline_data(inode, attr->ia_size, NULL);
                 if (err)
                         return err;
 
-                truncate_setsize(inode, attr->ia_size);
-                f2fs_truncate(inode);
-                f2fs_balance_fs(F2FS_I_SB(inode));
+                if (attr->ia_size != i_size_read(inode)) {
+                        truncate_setsize(inode, attr->ia_size);
+                        f2fs_truncate(inode);
+                        f2fs_balance_fs(F2FS_I_SB(inode));
+                } else {
+                        /*
+                         * giving a chance to truncate blocks past EOF which
+                         * are fallocated with FALLOC_FL_KEEP_SIZE.
+                         */
+                        f2fs_truncate(inode);
+                }
         }
 
         __setattr_copy(inode, attr);