Hi, Comment as following. > -----Original Message----- > From: Jaegeuk Kim [mailto:jaegeuk.kim@xxxxxxxxxxx] > Sent: Monday, December 02, 2013 4:27 PM > To: linux-fsdevel@xxxxxxxxxxxxxxx > Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-f2fs-devel@xxxxxxxxxxxxxxxxxxxxx > Subject: Re: [f2fs-dev] [PATCH v2] f2fs: refactor bio-related operations > > Change log from v1: > o remove redundant codes > > >From a480dfc915490f4bca7275f6fbb44fa34aa00eaa Mon Sep 17 00:00:00 2001 > From: Jaegeuk Kim <jaegeuk.kim@xxxxxxxxxxx> > Date: Sat, 30 Nov 2013 12:51:14 +0900 > Subject: [PATCH] f2fs: refactor bio-related operations > Cc: linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-f2fs-devel@xxxxxxxxxxxxxxxxxxxxx > > This patch integrates redundant bio operations on read and write IOs. > > 1. Move bio-related codes to the top of data.c. > 2. Replace f2fs_submit_bio with f2fs_submit_merged_bio, which handles read > bios additionally. > 3. Introduce __submit_merged_bio to submit the merged bio. > 4. Change f2fs_readpage to f2fs_submit_page_bio. > 5. Introduce f2fs_submit_page_mbio to integrate previous submit_read_page and > submit_write_page. [snip] > +static void __submit_merged_bio(struct f2fs_sb_info *sbi, > + struct f2fs_bio_info *io, > + enum page_type type, bool sync, int rw) > +{ > + enum page_type btype = PAGE_TYPE_OF_BIO(type); > + > + if (!io->bio) > + return; > + > + if (btype == META) > + rw |= REQ_META; > + > + if (is_read_io(rw)) { > + if (sync) > + rw |= READ_SYNC; > + submit_bio(rw, io->bio); > + trace_f2fs_submit_read_bio(sbi->sb, rw, type, io->bio); > + io->bio = NULL; > + return; > + } > + > + if (sync) > + rw |= WRITE_SYNC; rw = WRITE_SYNC; ? > + if (type >= META_FLUSH) > + rw |= WRITE_FLUSH_FUA; rw = WRITE_FLUSH_FUA; ? > + > + /* > + * META_FLUSH is only from the checkpoint procedure, and we should wait > + * this metadata bio for FS consistency. > + */ > + if (type == META_FLUSH) { > + DECLARE_COMPLETION_ONSTACK(wait); > + io->bio->bi_private = &wait; > + submit_bio(rw, io->bio); > + wait_for_completion(&wait); > + } else { > + submit_bio(rw, io->bio); > + } > + trace_f2fs_submit_write_bio(sbi->sb, rw, btype, io->bio); > + io->bio = NULL; > +} [snip] Thanks, Yu -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
