diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 8cb184c..0084ef9 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1205,6 +1205,9 @@
 	unsigned long s_mb_last_group;
 	unsigned long s_mb_last_start;
 
+	/* gid that's allowed to see stale data via falloc flag. */
+	gid_t no_hide_stale_gid;
+
 	/* stats for buddy allocator */
 	atomic_t s_bal_reqs;	/* number of reqs with len > 1 */
 	atomic_t s_bal_success;	/* we found long enough chunks */
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 54f2bdc..8a4f6b2 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4299,6 +4299,7 @@
 	int retries = 0;
 	int flags;
 	struct ext4_map_blocks map;
+	struct ext4_sb_info *sbi;
 	unsigned int credits, blkbits = inode->i_blkbits;
 
 	/*
@@ -4309,12 +4310,23 @@
 		return -EOPNOTSUPP;
 
 	/* Return error if mode is not supported */
-	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
+	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
+		     FALLOC_FL_NO_HIDE_STALE))
 		return -EOPNOTSUPP;
 
 	if (mode & FALLOC_FL_PUNCH_HOLE)
 		return ext4_punch_hole(file, offset, len);
 
+	sbi = EXT4_SB(inode->i_sb);
+	/* Must have RAWIO to see stale data. */
+	if ((mode & FALLOC_FL_NO_HIDE_STALE) &&
+	    !in_egroup_p(sbi->no_hide_stale_gid))
+		return -EACCES;
+
+	/* preallocation to directories is currently not supported */
+	if (S_ISDIR(inode->i_mode))
+		return -ENODEV;
+
 	trace_ext4_fallocate_enter(inode, offset, len, mode);
 	map.m_lblk = offset >> blkbits;
 	/*
@@ -4353,6 +4365,8 @@
 			ret = PTR_ERR(handle);
 			break;
 		}
+		if (mode & FALLOC_FL_NO_HIDE_STALE)
+			flags &= ~EXT4_GET_BLOCKS_UNINIT_EXT;
 		ret = ext4_map_blocks(handle, inode, &map, flags);
 		if (ret <= 0) {
 #ifdef EXT4FS_DEBUG
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 0a6eeff..4e99e1d 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1161,6 +1161,9 @@
 		seq_printf(seq, ",init_itable=%u",
 			   (unsigned) sbi->s_li_wait_mult);
 
+	if (sbi->no_hide_stale_gid != -1)
+		seq_printf(seq, ",nohide_stale_gid=%u", sbi->no_hide_stale_gid);
+
 	ext4_show_quota_options(seq, sb);
 
 	return 0;
@@ -1335,6 +1338,7 @@
 	Opt_inode_readahead_blks, Opt_journal_ioprio,
 	Opt_dioread_nolock, Opt_dioread_lock,
 	Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
+	Opt_nohide_stale_gid,
 };
 
 static const match_table_t tokens = {
@@ -1410,6 +1414,7 @@
 	{Opt_init_itable, "init_itable=%u"},
 	{Opt_init_itable, "init_itable"},
 	{Opt_noinit_itable, "noinit_itable"},
+	{Opt_nohide_stale_gid, "nohide_stale_gid=%u"},
 	{Opt_err, NULL},
 };
 
@@ -1903,6 +1908,12 @@
 				return 0;
 			sbi->s_li_wait_mult = option;
 			break;
+		case Opt_nohide_stale_gid:
+			if (match_int(&args[0], &option))
+				return 0;
+			/* -1 for disabled, otherwise it's valid. */
+			sbi->no_hide_stale_gid = option;
+			break;
 		case Opt_noinit_itable:
 			clear_opt(sb, INIT_INODE_TABLE);
 			break;
@@ -3321,6 +3332,9 @@
 	sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
 	sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
 
+	/* Default to having no-hide-stale disabled. */
+	sbi->no_hide_stale_gid = -1;
+
 	if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
 		set_opt(sb, BARRIER);
 
diff --git a/fs/open.c b/fs/open.c
index e2b5d51..15e5192 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -223,7 +223,9 @@
 		return -EINVAL;
 
 	/* Return error if mode is not supported */
-	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
+	if (mode & ~(FALLOC_FL_KEEP_SIZE |
+		     FALLOC_FL_PUNCH_HOLE |
+		     FALLOC_FL_NO_HIDE_STALE))
 		return -EOPNOTSUPP;
 
 	/* Punch hole must have keep size set */
diff --git a/include/linux/falloc.h b/include/linux/falloc.h
index 73e0b62..a2489ac 100644
--- a/include/linux/falloc.h
+++ b/include/linux/falloc.h
@@ -3,6 +3,7 @@
 
 #define FALLOC_FL_KEEP_SIZE	0x01 /* default is extend size */
 #define FALLOC_FL_PUNCH_HOLE	0x02 /* de-allocates range */
+#define FALLOC_FL_NO_HIDE_STALE	0x04 /* default is hide stale data */
 
 #ifdef __KERNEL__