@@ -4333,9 +4333,13 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
if (attr->ia_valid & ATTR_SIZE) {
if (attr->ia_size != inode->i_size) {
truncate_setsize(inode, attr->ia_size);
- /* Inode size will be reduced, wait for dio in flight */
- if (orphan)
+ /* Inode size will be reduced, wait for dio in flight.
+ * Temproraly disable unlocked DIO to prevent livelock */
+ if (orphan) {
+ ext4_inode_block_unlocked_dio(inode);
inode_dio_wait(inode);
+ ext4_inode_resume_unlocked_dio(inode);
+ }
}
ext4_truncate(inode);
}
If we have enough aggressive DIO readers, truncate and other dio waiters will wait forever inside inode_dio_wait(). It is reasonable to disable nonlock DIO read optimization during truncate. Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> --- fs/ext4/inode.c | 8 ++++++-- 1 files changed, 6 insertions(+), 2 deletions(-)