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Message-ID: <20220831072111.3569680-10-yi.zhang@huawei.com> Date: Wed, 31 Aug 2022 15:21:06 +0800 From: Zhang Yi <yi.zhang@...wei.com> To: <linux-ext4@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <cluster-devel@...hat.com>, <ntfs3@...ts.linux.dev>, <ocfs2-devel@....oracle.com>, <reiserfs-devel@...r.kernel.org> CC: <jack@...e.cz>, <tytso@....edu>, <akpm@...ux-foundation.org>, <axboe@...nel.dk>, <viro@...iv.linux.org.uk>, <rpeterso@...hat.com>, <agruenba@...hat.com>, <almaz.alexandrovich@...agon-software.com>, <mark@...heh.com>, <dushistov@...l.ru>, <hch@...radead.org>, <yi.zhang@...wei.com>, <chengzhihao1@...wei.com>, <yukuai3@...wei.com> Subject: [PATCH 09/14] reiserfs: replace ll_rw_block() ll_rw_block() is not safe for the sync read/write path because it cannot guarantee that submitting read/write IO if the buffer has been locked. We could get false positive EIO after wait_on_buffer() in read path if the buffer has been locked by others. So stop using ll_rw_block() in reiserfs. We also switch to new bh_readahead_batch() helper for the buffer array readahead path. Signed-off-by: Zhang Yi <yi.zhang@...wei.com> --- fs/reiserfs/journal.c | 11 ++++++----- fs/reiserfs/stree.c | 4 ++-- fs/reiserfs/super.c | 4 +--- 3 files changed, 9 insertions(+), 10 deletions(-) diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c index 94addfcefede..699b1b8d5b73 100644 --- a/fs/reiserfs/journal.c +++ b/fs/reiserfs/journal.c @@ -868,7 +868,7 @@ static int write_ordered_buffers(spinlock_t * lock, */ if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) { spin_unlock(lock); - ll_rw_block(REQ_OP_WRITE, 1, &bh); + write_dirty_buffer(bh, 0); spin_lock(lock); } put_bh(bh); @@ -1054,7 +1054,7 @@ static int flush_commit_list(struct super_block *s, if (tbh) { if (buffer_dirty(tbh)) { depth = reiserfs_write_unlock_nested(s); - ll_rw_block(REQ_OP_WRITE, 1, &tbh); + write_dirty_buffer(tbh, 0); reiserfs_write_lock_nested(s, depth); } put_bh(tbh) ; @@ -2240,7 +2240,7 @@ static int journal_read_transaction(struct super_block *sb, } } /* read in the log blocks, memcpy to the corresponding real block */ - ll_rw_block(REQ_OP_READ, get_desc_trans_len(desc), log_blocks); + bh_read_batch(log_blocks, get_desc_trans_len(desc)); for (i = 0; i < get_desc_trans_len(desc); i++) { wait_on_buffer(log_blocks[i]); @@ -2342,10 +2342,11 @@ static struct buffer_head *reiserfs_breada(struct block_device *dev, } else bhlist[j++] = bh; } - ll_rw_block(REQ_OP_READ, j, bhlist); + bh = bhlist[0]; + bh_read_nowait(bh, 0); + bh_readahead_batch(&bhlist[1], j - 1, 0); for (i = 1; i < j; i++) brelse(bhlist[i]); - bh = bhlist[0]; wait_on_buffer(bh); if (buffer_uptodate(bh)) return bh; diff --git a/fs/reiserfs/stree.c b/fs/reiserfs/stree.c index 9a293609a022..84c12a1947b2 100644 --- a/fs/reiserfs/stree.c +++ b/fs/reiserfs/stree.c @@ -579,7 +579,7 @@ static int search_by_key_reada(struct super_block *s, if (!buffer_uptodate(bh[j])) { if (depth == -1) depth = reiserfs_write_unlock_nested(s); - ll_rw_block(REQ_OP_READ | REQ_RAHEAD, 1, bh + j); + bh_readahead(bh[j], REQ_RAHEAD); } brelse(bh[j]); } @@ -685,7 +685,7 @@ int search_by_key(struct super_block *sb, const struct cpu_key *key, if (!buffer_uptodate(bh) && depth == -1) depth = reiserfs_write_unlock_nested(sb); - ll_rw_block(REQ_OP_READ, 1, &bh); + bh_read_nowait(bh, 0); wait_on_buffer(bh); if (depth != -1) diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c index c88cd2ce0665..8b1db82b6949 100644 --- a/fs/reiserfs/super.c +++ b/fs/reiserfs/super.c @@ -1702,9 +1702,7 @@ static int read_super_block(struct super_block *s, int offset) /* after journal replay, reread all bitmap and super blocks */ static int reread_meta_blocks(struct super_block *s) { - ll_rw_block(REQ_OP_READ, 1, &SB_BUFFER_WITH_SB(s)); - wait_on_buffer(SB_BUFFER_WITH_SB(s)); - if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) { + if (bh_read(SB_BUFFER_WITH_SB(s), 0)) { reiserfs_warning(s, "reiserfs-2504", "error reading the super"); return 1; } -- 2.31.1
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