ext4: serialize fallocate with ext4_convert_unwritten_extents

[deliverable/linux.git] / fs / ext4 / extents.c

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 1c94cca35ed1a12ce42ce39bddea7c9dd23111cf..c2789271e7b4ee5c2eecff2291b4b2f5fbf4eacc 100644 (file)
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4428,6 +4428,9 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
         */
        if (len <= EXT_UNINIT_MAX_LEN << blkbits)
                flags |= EXT4_GET_BLOCKS_NO_NORMALIZE;
+
+       /* Prevent race condition between unwritten */
+       ext4_flush_unwritten_io(inode);
 retry:
        while (ret >= 0 && ret < max_blocks) {
                map.m_lblk = map.m_lblk + ret;