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-rw-r--r--fs/ext4/inode.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index fbe11e6..65576c0 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4419,6 +4419,31 @@ int ext4_can_truncate(struct inode *inode)
}
/*
+ * ext4_punch_hole: punches a hole in a file by releaseing the blocks
+ * associated with the given offset and length
+ *
+ * @inode: File inode
+ * @offset: The offset where the hole will begin
+ * @len: The length of the hole
+ *
+ * Returns: 0 on sucess or negative on failure
+ */
+
+int ext4_punch_hole(struct file *file, loff_t offset, loff_t length)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
+ if (!S_ISREG(inode->i_mode))
+ return -ENOTSUPP;
+
+ if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) {
+ /* TODO: Add support for non extent hole punching */
+ return -ENOTSUPP;
+ }
+
+ return ext4_ext_punch_hole(file, offset, length);
+}
+
+/*
* ext4_truncate()
*
* We block out ext4_get_block() block instantiations across the entire
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