On 2017/5/18 11:06, sunqiuyang wrote: > From: Qiuyang Sun <sunqiuyang@xxxxxxxxxx> > > Currently in F2FS, page faults and operations that truncate the pagecahe > or data blocks, are completely unsynchronized. This can result in page > fault faulting in a page into a range that we are changing after > truncating, and thus we can end up with a page mapped to disk blocks that > will be shortly freed. Filesystem corruption will shortly follow. > > This patch fixes the problem by creating new rw semaphore i_mmap_sem in > f2fs_inode_info and grab it for functions removing blocks from extent tree > and for read over page faults. The mechanism is similar to that in ext4. > > Signed-off-by: Qiuyang Sun <sunqiuyang@xxxxxxxxxx> Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx>
