From: Chao Yu <[email protected]> Serialize data/node IOs by using fifo list instead of mutex lock, it will help to enhance concurrency of f2fs, meanwhile keeping LFS IO semantics.
Signed-off-by: Chao Yu <[email protected]> --- fs/f2fs/checkpoint.c | 1 + fs/f2fs/data.c | 28 ++++++++++++++++++++++++---- fs/f2fs/f2fs.h | 5 ++++- fs/f2fs/gc.c | 3 ++- fs/f2fs/segment.c | 20 ++++++++++++++------ fs/f2fs/segment.h | 3 ++- 6 files changed, 47 insertions(+), 13 deletions(-) diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c index 2a475e83a092..7b3393474f6b 100644 --- a/fs/f2fs/checkpoint.c +++ b/fs/f2fs/checkpoint.c @@ -162,6 +162,7 @@ int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages, .op = REQ_OP_READ, .op_flags = sync ? (REQ_META | REQ_PRIO) : REQ_RAHEAD, .encrypted_page = NULL, + .in_list = false, }; struct blk_plug plug; diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 5f001b471252..89eaa8aaa97b 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -393,10 +393,28 @@ int f2fs_submit_page_mbio(struct f2fs_io_info *fio) struct f2fs_bio_info *io; bool is_read = is_read_io(fio->op); struct page *bio_page; + struct curseg_info *curseg; int err = 0; + if (fio->in_list) + curseg = CURSEG_I(sbi, fio->seg_type); + io = __get_bio_info(sbi, fio->op, fio->type, fio->seg_type); + down_write(&io->io_rwsem); +next: + if (fio->in_list) { + spin_lock(&curseg->io_lock); + if (list_empty(&curseg->io_list)) { + spin_unlock(&curseg->io_lock); + goto out_fail; + } + fio = list_first_entry(&curseg->io_list, + struct f2fs_io_info, list); + list_del(&fio->list); + spin_unlock(&curseg->io_lock); + } + if (fio->old_blkaddr != NEW_ADDR) verify_block_addr(sbi, fio->old_blkaddr); verify_block_addr(sbi, fio->new_blkaddr); @@ -409,8 +427,6 @@ int f2fs_submit_page_mbio(struct f2fs_io_info *fio) if (!is_read) inc_page_count(sbi, WB_DATA_TYPE(bio_page)); - down_write(&io->io_rwsem); - if (io->bio && (io->last_block_in_bio != fio->new_blkaddr - 1 || (io->fio.op != fio->op || io->fio.op_flags != fio->op_flags) || !__same_bdev(sbi, fio->new_blkaddr, io->bio))) @@ -437,9 +453,13 @@ int f2fs_submit_page_mbio(struct f2fs_io_info *fio) io->last_block_in_bio = fio->new_blkaddr; f2fs_trace_ios(fio, 0); + + trace_f2fs_submit_page_mbio(fio->page, fio); + + if (fio->in_list) + goto next; out_fail: up_write(&io->io_rwsem); - trace_f2fs_submit_page_mbio(fio->page, fio); return err; } @@ -752,7 +772,7 @@ static int __allocate_data_block(struct dnode_of_data *dn) set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version); allocate_data_block(sbi, NULL, dn->data_blkaddr, &dn->data_blkaddr, - &sum, CURSEG_WARM_DATA); + &sum, CURSEG_WARM_DATA, NULL, false); set_data_blkaddr(dn); /* update i_size */ diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 9129a6229bc8..6b8e9f051aa2 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -802,8 +802,10 @@ struct f2fs_io_info { block_t old_blkaddr; /* old block address before Cow */ struct page *page; /* page to be written */ struct page *encrypted_page; /* encrypted page */ + struct list_head list; /* serialize IOs */ bool submitted; /* indicate IO submission */ bool need_lock; /* indicate we need to lock cp_rwsem */ + bool in_list; /* indicate fio is in io_list */ }; #define is_read_io(rw) ((rw) == READ) @@ -2274,7 +2276,8 @@ void f2fs_replace_block(struct f2fs_sb_info *sbi, struct dnode_of_data *dn, bool recover_newaddr); void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page, block_t old_blkaddr, block_t *new_blkaddr, - struct f2fs_summary *sum, int type); + struct f2fs_summary *sum, int type, + struct f2fs_io_info *fio, bool add_list); void f2fs_wait_on_page_writeback(struct page *page, enum page_type type, bool ordered); void f2fs_wait_on_encrypted_page_writeback(struct f2fs_sb_info *sbi, diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c index 8b267ca30926..ac2f74e40eea 100644 --- a/fs/f2fs/gc.c +++ b/fs/f2fs/gc.c @@ -590,6 +590,7 @@ static void move_encrypted_block(struct inode *inode, block_t bidx, .op = REQ_OP_READ, .op_flags = 0, .encrypted_page = NULL, + .in_list = false, }; struct dnode_of_data dn; struct f2fs_summary sum; @@ -633,7 +634,7 @@ static void move_encrypted_block(struct inode *inode, block_t bidx, fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr; allocate_data_block(fio.sbi, NULL, fio.old_blkaddr, &newaddr, - &sum, fio.seg_type); + &sum, fio.seg_type, NULL, false); fio.encrypted_page = pagecache_get_page(META_MAPPING(fio.sbi), newaddr, FGP_LOCK | FGP_CREAT, GFP_NOFS); diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index c047b5d8b9d3..d4975b8f4620 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -2100,7 +2100,8 @@ static int __get_segment_type(struct page *page, enum page_type p_type) void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page, block_t old_blkaddr, block_t *new_blkaddr, - struct f2fs_summary *sum, int type) + struct f2fs_summary *sum, int type, + struct f2fs_io_info *fio, bool add_list) { struct sit_info *sit_i = SIT_I(sbi); struct curseg_info *curseg = CURSEG_I(sbi, type); @@ -2136,6 +2137,14 @@ void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page, if (page && IS_NODESEG(type)) fill_node_footer_blkaddr(page, NEXT_FREE_BLKADDR(sbi, curseg)); + if (add_list) { + INIT_LIST_HEAD(&fio->list); + fio->in_list = true; + spin_lock(&curseg->io_lock); + list_add_tail(&fio->list, &curseg->io_list); + spin_unlock(&curseg->io_lock); + } + mutex_unlock(&curseg->curseg_mutex); } @@ -2145,10 +2154,9 @@ static void do_write_page(struct f2fs_summary *sum, struct f2fs_io_info *fio) fio->seg_type = __get_segment_type(fio->page, fio->type); - mutex_lock(&CURSEG_I(fio->sbi, fio->seg_type)->wio_mutex); reallocate: allocate_data_block(fio->sbi, fio->page, fio->old_blkaddr, - &fio->new_blkaddr, sum, fio->seg_type); + &fio->new_blkaddr, sum, fio->seg_type, fio, true); /* writeout dirty page into bdev */ err = f2fs_submit_page_mbio(fio); @@ -2156,8 +2164,6 @@ static void do_write_page(struct f2fs_summary *sum, struct f2fs_io_info *fio) fio->old_blkaddr = fio->new_blkaddr; goto reallocate; } - - mutex_unlock(&CURSEG_I(fio->sbi, fio->seg_type)->wio_mutex); } void write_meta_page(struct f2fs_sb_info *sbi, struct page *page) @@ -2171,6 +2177,7 @@ void write_meta_page(struct f2fs_sb_info *sbi, struct page *page) .new_blkaddr = page->index, .page = page, .encrypted_page = NULL, + .in_list = false, }; if (unlikely(page->index >= MAIN_BLKADDR(sbi))) @@ -2978,7 +2985,8 @@ static int build_curseg(struct f2fs_sb_info *sbi) array[i].bio_info.sbi = sbi; array[i].bio_info.bio = NULL; - mutex_init(&array[i].wio_mutex); + spin_lock_init(&array[i].io_lock); + INIT_LIST_HEAD(&array[i].io_list); } return restore_curseg_summaries(sbi); } diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h index 701944b462cd..b6f5dffeaa61 100644 --- a/fs/f2fs/segment.h +++ b/fs/f2fs/segment.h @@ -283,7 +283,8 @@ struct curseg_info { struct rw_semaphore journal_rwsem; /* protect journal area */ struct f2fs_journal *journal; /* cached journal info */ struct f2fs_bio_info bio_info; /* for log bios */ - struct mutex wio_mutex; /* serialize DATA/NODE IOs */ + spinlock_t io_lock; /* serialize DATA/NODE IOs */ + struct list_head io_list; /* tracking fios */ unsigned char alloc_type; /* current allocation type */ unsigned int segno; /* current segment number */ unsigned short next_blkoff; /* next block offset to write */ -- 2.12.2.575.gb14f27f
