Re: [f2fs-dev] [PATCH] f2fs: protect new segment allocation in expand_inode_data

From: Chao Yu
Date: Wed May 27 2020 - 22:17:48 EST

On 2020/5/27 12:02, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@xxxxxxxxxx>
> Found a new segemnt allocation without f2fs_lock_op() in
> expand_inode_data(). So, when we do fallocate() for a pinned file
> and trigger checkpoint very frequently and simultaneously. F2FS gets
> stuck in the below code of do_checkpoint() forever.
> f2fs_sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
> /* Wait for all dirty meta pages to be submitted for IO */
> <= if fallocate() here,
> f2fs_wait_on_all_pages(sbi, F2FS_DIRTY_META); <= it'll wait forever.
> Signed-off-by: Daeho Jeong <daehojeong@xxxxxxxxxx>

Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx>