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Message-Id: <20140106170334.10677a1411be318db882e1fd@canb.auug.org.au>
Date: Mon, 6 Jan 2014 17:03:34 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Jens Axboe <axboe@...nel.dk>, Jaegeuk Kim <jaegeuk.kim@...sung.com>
Cc: linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
Huajun Li <huajun.li@...el.com>,
Chao Yu <chao2.yu@...sung.com>,
Gu Zheng <guz.fnst@...fujitsu.com>,
Kent Overstreet <kmo@...erainc.com>
Subject: linux-next: manual merge of the block tree with the f2fs tree
Hi Jens,
Today's linux-next merge of the block tree got a conflict in
fs/f2fs/data.c between various commits from the f2fs tree and commits
2c30c71bd653 ("block: Convert various code to bio_for_each_segment()")
and 4f024f3797c4 ("block: Abstract out bvec iterator") from the block
tree.
I fixed it up (see below) and can carry the fix as necessary (no action
is required).
The conflict in this file are a bit of a pain as I am having to fix this
up by hand most days (and I hope I am getting it right). Maybe the f2fs
tree could merge commit 4f024f3797c4 ("block: Abstract out bvec
iterator") from the block tree (assuming that it will remain stable) as
it is only 4 commits and do these fixups properly (with a bit of help in
case what I have done above is not exactly right). That merge commit
would need a good commit message, of course.
--
Cheers,
Stephen Rothwell sfr@...b.auug.org.au
diff --cc fs/f2fs/data.c
index 63d190264a36,a2c8de8ba6ce..000000000000
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@@ -24,195 -24,6 +24,192 @@@
#include "segment.h"
#include <trace/events/f2fs.h>
+static void f2fs_read_end_io(struct bio *bio, int err)
+{
- const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
- struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
++ struct bio_vec *bvec;
++ int i;
+
- do {
++ bio_for_each_segment_all(bvec, bio, i) {
+ struct page *page = bvec->bv_page;
+
- if (--bvec >= bio->bi_io_vec)
- prefetchw(&bvec->bv_page->flags);
-
- if (unlikely(!uptodate)) {
++ if (unlikely(err)) {
+ ClearPageUptodate(page);
+ SetPageError(page);
+ } else {
+ SetPageUptodate(page);
+ }
+ unlock_page(page);
- } while (bvec >= bio->bi_io_vec);
++ }
+
+ bio_put(bio);
+}
+
+static void f2fs_write_end_io(struct bio *bio, int err)
+{
- const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
- struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
- struct f2fs_sb_info *sbi = F2FS_SB(bvec->bv_page->mapping->host->i_sb);
++ struct bio_vec *bvec;
++ struct f2fs_sb_info *sbi = NULL;
++ int i;
+
- do {
++ bio_for_each_segment_all(bvec, bio, i) {
+ struct page *page = bvec->bv_page;
+
- if (--bvec >= bio->bi_io_vec)
- prefetchw(&bvec->bv_page->flags);
++ if (!sbi)
++ sbi = F2FS_SB(bvec->bv_page->mapping->host->i_sb);
+
- if (unlikely(!uptodate)) {
++ if (unlikely(err)) {
+ SetPageError(page);
+ set_bit(AS_EIO, &page->mapping->flags);
+ set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
+ sbi->sb->s_flags |= MS_RDONLY;
+ }
+ end_page_writeback(page);
+ dec_page_count(sbi, F2FS_WRITEBACK);
- } while (bvec >= bio->bi_io_vec);
++ }
+
+ if (bio->bi_private)
+ complete(bio->bi_private);
+
+ if (!get_pages(sbi, F2FS_WRITEBACK) &&
+ !list_empty(&sbi->cp_wait.task_list))
+ wake_up(&sbi->cp_wait);
+
+ bio_put(bio);
+}
+
+/*
+ * Low-level block read/write IO operations.
+ */
+static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr,
+ int npages, bool is_read)
+{
+ struct bio *bio;
+
+ /* No failure on bio allocation */
+ bio = bio_alloc(GFP_NOIO, npages);
+
+ bio->bi_bdev = sbi->sb->s_bdev;
- bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr);
++ bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr);
+ bio->bi_end_io = is_read ? f2fs_read_end_io : f2fs_write_end_io;
+
+ return bio;
+}
+
+static void __submit_merged_bio(struct f2fs_bio_info *io)
+{
+ struct f2fs_io_info *fio = &io->fio;
+ int rw;
+
+ if (!io->bio)
+ return;
+
+ rw = fio->rw;
+
+ if (is_read_io(rw)) {
+ trace_f2fs_submit_read_bio(io->sbi->sb, rw,
+ fio->type, io->bio);
+ submit_bio(rw, io->bio);
+ } else {
+ trace_f2fs_submit_write_bio(io->sbi->sb, rw,
+ fio->type, io->bio);
+ /*
+ * META_FLUSH is only from the checkpoint procedure, and we
+ * should wait this metadata bio for FS consistency.
+ */
+ if (fio->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);
+ }
+ }
+
+ io->bio = NULL;
+}
+
+void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi,
+ enum page_type type, int rw)
+{
+ enum page_type btype = PAGE_TYPE_OF_BIO(type);
+ struct f2fs_bio_info *io;
+
+ io = is_read_io(rw) ? &sbi->read_io : &sbi->write_io[btype];
+
+ mutex_lock(&io->io_mutex);
+
+ /* change META to META_FLUSH in the checkpoint procedure */
+ if (type >= META_FLUSH) {
+ io->fio.type = META_FLUSH;
+ io->fio.rw = WRITE_FLUSH_FUA;
+ }
+ __submit_merged_bio(io);
+ mutex_unlock(&io->io_mutex);
+}
+
+/*
+ * Fill the locked page with data located in the block address.
+ * Return unlocked page.
+ */
+int f2fs_submit_page_bio(struct f2fs_sb_info *sbi, struct page *page,
+ block_t blk_addr, int rw)
+{
+ struct bio *bio;
+
+ trace_f2fs_submit_page_bio(page, blk_addr, rw);
+
+ /* Allocate a new bio */
+ bio = __bio_alloc(sbi, blk_addr, 1, is_read_io(rw));
+
+ if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) {
+ bio_put(bio);
+ f2fs_put_page(page, 1);
+ return -EFAULT;
+ }
+
+ submit_bio(rw, bio);
+ return 0;
+}
+
+void f2fs_submit_page_mbio(struct f2fs_sb_info *sbi, struct page *page,
+ block_t blk_addr, struct f2fs_io_info *fio)
+{
+ enum page_type btype = PAGE_TYPE_OF_BIO(fio->type);
+ struct f2fs_bio_info *io;
+ bool is_read = is_read_io(fio->rw);
+
+ io = is_read ? &sbi->read_io : &sbi->write_io[btype];
+
+ verify_block_addr(sbi, blk_addr);
+
+ mutex_lock(&io->io_mutex);
+
+ if (!is_read)
+ inc_page_count(sbi, F2FS_WRITEBACK);
+
+ if (io->bio && (io->last_block_in_bio != blk_addr - 1 ||
+ io->fio.rw != fio->rw))
+ __submit_merged_bio(io);
+alloc_new:
+ if (io->bio == NULL) {
+ int bio_blocks = MAX_BIO_BLOCKS(max_hw_blocks(sbi));
+
+ io->bio = __bio_alloc(sbi, blk_addr, bio_blocks, is_read);
+ io->fio = *fio;
+ }
+
+ if (bio_add_page(io->bio, page, PAGE_CACHE_SIZE, 0) <
+ PAGE_CACHE_SIZE) {
+ __submit_merged_bio(io);
+ goto alloc_new;
+ }
+
+ io->last_block_in_bio = blk_addr;
+
+ mutex_unlock(&io->io_mutex);
+ trace_f2fs_submit_page_mbio(page, fio->rw, fio->type, blk_addr);
+}
+
/*
* Lock ordering for the change of data block address:
* ->data_page
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