[PATCH 4.4 91/99] ext4: fix punch hole for inline_data file systems

From: Greg Kroah-Hartman
Date: Thu Oct 03 2019 - 12:00:29 EST


From: Theodore Ts'o <tytso@xxxxxxx>

commit c1e8220bd316d8ae8e524df39534b8a412a45d5e upstream.

If a program attempts to punch a hole on an inline data file, we need
to convert it to a normal file first.

This was detected using ext4/032 using the adv configuration. Simple
reproducer:

mke2fs -Fq -t ext4 -O inline_data /dev/vdc
mount /vdc
echo "" > /vdc/testfile
xfs_io -c 'truncate 33554432' /vdc/testfile
xfs_io -c 'fpunch 0 1048576' /vdc/testfile
umount /vdc
e2fsck -fy /dev/vdc

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
fs/ext4/inode.c | 9 +++++++++
1 file changed, 9 insertions(+)

--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3705,6 +3705,15 @@ int ext4_punch_hole(struct inode *inode,

trace_ext4_punch_hole(inode, offset, length, 0);

+ ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
+ if (ext4_has_inline_data(inode)) {
+ down_write(&EXT4_I(inode)->i_mmap_sem);
+ ret = ext4_convert_inline_data(inode);
+ up_write(&EXT4_I(inode)->i_mmap_sem);
+ if (ret)
+ return ret;
+ }
+
/*
* Write out all dirty pages to avoid race conditions
* Then release them.