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Date: Mon, 26 Jun 2017 20:09:56 +0800 From: Ming Lei <ming.lei@...hat.com> To: Jens Axboe <axboe@...com>, Christoph Hellwig <hch@...radead.org>, Huang Ying <ying.huang@...el.com>, Andrew Morton <akpm@...ux-foundation.org>, Alexander Viro <viro@...iv.linux.org.uk> Cc: linux-kernel@...r.kernel.org, linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-mm@...ck.org, Ming Lei <ming.lei@...hat.com>, Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>, David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org Subject: [PATCH v2 13/51] btrfs: avoid access to .bi_vcnt directly BTRFS uses bio->bi_vcnt to figure out page numbers, this way becomes not correct once we start to enable multipage bvec. So use bio_for_each_segment_all() to do that instead. Cc: Chris Mason <clm@...com> Cc: Josef Bacik <jbacik@...com> Cc: David Sterba <dsterba@...e.com> Cc: linux-btrfs@...r.kernel.org Signed-off-by: Ming Lei <ming.lei@...hat.com> --- fs/btrfs/extent_io.c | 21 +++++++++++++++++---- fs/btrfs/extent_io.h | 2 +- 2 files changed, 18 insertions(+), 5 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 0863164d97d2..5b453cada1ea 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -2258,7 +2258,7 @@ int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end, return 0; } -int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio, +int btrfs_check_repairable(struct inode *inode, unsigned failed_bio_pages, struct io_failure_record *failrec, int failed_mirror) { struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); @@ -2282,7 +2282,7 @@ int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio, * a) deliver good data to the caller * b) correct the bad sectors on disk */ - if (failed_bio->bi_vcnt > 1) { + if (failed_bio_pages > 1) { /* * to fulfill b), we need to know the exact failing sectors, as * we don't want to rewrite any more than the failed ones. thus, @@ -2355,6 +2355,17 @@ struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio, return bio; } +static unsigned int get_bio_pages(struct bio *bio) +{ + unsigned i; + struct bio_vec *bv; + + bio_for_each_segment_all(bv, bio, i) + ; + + return i; +} + /* * this is a generic handler for readpage errors (default * readpage_io_failed_hook). if other copies exist, read those and write back @@ -2375,6 +2386,7 @@ static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset, int read_mode = 0; blk_status_t status; int ret; + unsigned failed_bio_pages = get_bio_pages(failed_bio); BUG_ON(bio_op(failed_bio) == REQ_OP_WRITE); @@ -2382,13 +2394,14 @@ static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset, if (ret) return ret; - ret = btrfs_check_repairable(inode, failed_bio, failrec, failed_mirror); + ret = btrfs_check_repairable(inode, failed_bio_pages, failrec, + failed_mirror); if (!ret) { free_io_failure(failure_tree, tree, failrec); return -EIO; } - if (failed_bio->bi_vcnt > 1) + if (failed_bio_pages > 1) read_mode |= REQ_FAILFAST_DEV; phy_offset >>= inode->i_sb->s_blocksize_bits; diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index d4942d94a16b..90681d1f0786 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -539,7 +539,7 @@ void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start, u64 end); int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end, struct io_failure_record **failrec_ret); -int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio, +int btrfs_check_repairable(struct inode *inode, unsigned failed_bio_pages, struct io_failure_record *failrec, int fail_mirror); struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio, struct io_failure_record *failrec, -- 2.9.4
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