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f2fs: introduce io_list for serialize data/node IOs

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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 <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2017-05-19 23:37:01 +08:00 committed by Jaegeuk Kim
parent e41e6d75e5
commit fb830fc5cf
6 changed files with 46 additions and 13 deletions
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1
fs/f2fs/checkpoint.c
View File

@ -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;

24
fs/f2fs/data.c
View File

@ -397,6 +397,20 @@ int f2fs_submit_page_write(struct f2fs_io_info *fio)
f2fs_bug_on(sbi, is_read_io(fio->op));
down_write(&io->io_rwsem);
next:
if (fio->in_list) {
spin_lock(&io->io_lock);
if (list_empty(&io->io_list)) {
spin_unlock(&io->io_lock);
goto out_fail;
}
fio = list_first_entry(&io->io_list,
struct f2fs_io_info, list);
list_del(&fio->list);
spin_unlock(&io->io_lock);
}
if (fio->old_blkaddr != NEW_ADDR)
verify_block_addr(sbi, fio->old_blkaddr);
verify_block_addr(sbi, fio->new_blkaddr);
@ -408,8 +422,6 @@ int f2fs_submit_page_write(struct f2fs_io_info *fio)
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)))
@ -434,9 +446,13 @@ alloc_new:
io->last_block_in_bio = fio->new_blkaddr;
f2fs_trace_ios(fio, 0);
trace_f2fs_submit_page_write(fio->page, fio);
if (fio->in_list)
goto next;
out_fail:
up_write(&io->io_rwsem);
trace_f2fs_submit_page_write(fio->page, fio);
return err;
}
@ -749,7 +765,7 @@ alloc:
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 */

7
fs/f2fs/f2fs.h
View File

@ -815,8 +815,10 @@ 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 */
int 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)
@ -826,6 +828,8 @@ struct f2fs_bio_info {
sector_t last_block_in_bio; /* last block number */
struct f2fs_io_info fio; /* store buffered io info. */
struct rw_semaphore io_rwsem; /* blocking op for bio */
spinlock_t io_lock; /* serialize DATA/NODE IOs */
struct list_head io_list; /* track fios */
};
#define FDEV(i) (sbi->devs[i])
@ -2294,7 +2298,8 @@ 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,

3
fs/f2fs/gc.c
View File

@ -600,6 +600,7 @@ 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;
@ -643,7 +644,7 @@ 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, CURSEG_COLD_DATA);
&sum, CURSEG_COLD_DATA, NULL, false);
fio.encrypted_page = pagecache_get_page(META_MAPPING(fio.sbi), newaddr,
FGP_LOCK | FGP_CREAT, GFP_NOFS);

22
fs/f2fs/segment.c
View File

@ -2109,7 +2109,8 @@ static int __get_segment_type(struct f2fs_io_info *fio)
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);
@ -2145,6 +2146,17 @@ 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) {
struct f2fs_bio_info *io;
INIT_LIST_HEAD(&fio->list);
fio->in_list = true;
io = sbi->write_io[fio->type] + fio->temp;
spin_lock(&io->io_lock);
list_add_tail(&fio->list, &io->io_list);
spin_unlock(&io->io_lock);
}
mutex_unlock(&curseg->curseg_mutex);
}
@ -2153,11 +2165,9 @@ static void do_write_page(struct f2fs_summary *sum, struct f2fs_io_info *fio)
int type = __get_segment_type(fio);
int err;
if (fio->type == NODE || fio->type == DATA)
mutex_lock(&fio->sbi->wio_mutex[fio->type][fio->temp]);
reallocate:
allocate_data_block(fio->sbi, fio->page, fio->old_blkaddr,
&fio->new_blkaddr, sum, type);
&fio->new_blkaddr, sum, type, fio, true);
/* writeout dirty page into bdev */
err = f2fs_submit_page_write(fio);
@ -2165,9 +2175,6 @@ reallocate:
fio->old_blkaddr = fio->new_blkaddr;
goto reallocate;
}
if (fio->type == NODE || fio->type == DATA)
mutex_unlock(&fio->sbi->wio_mutex[fio->type][fio->temp]);
}
void write_meta_page(struct f2fs_sb_info *sbi, struct page *page)
@ -2181,6 +2188,7 @@ 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)))

2
fs/f2fs/super.c
View File

@ -1983,6 +1983,8 @@ try_onemore:
init_rwsem(&sbi->write_io[i][j].io_rwsem);
sbi->write_io[i][j].sbi = sbi;
sbi->write_io[i][j].bio = NULL;
spin_lock_init(&sbi->write_io[i][j].io_lock);
INIT_LIST_HEAD(&sbi->write_io[i][j].io_list);
}
}