diff mbox series

[v2,09/14] reiserfs: replace ll_rw_block()

Message ID 20220901133505.2510834-10-yi.zhang@huawei.com (mailing list archive)
State New, archived
Headers show
Series fs/buffer: remove ll_rw_block() | expand

Commit Message

Zhang Yi Sept. 1, 2022, 1:35 p.m. UTC 
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@huawei.com>
---
 fs/reiserfs/journal.c | 11 ++++++-----
 fs/reiserfs/stree.c   |  4 ++--
 fs/reiserfs/super.c   |  4 +---
 3 files changed, 9 insertions(+), 10 deletions(-)

Comments

Jan Kara Sept. 1, 2022, 3:52 p.m. UTC | #1 
On Thu 01-09-22 21:35:00, Zhang Yi wrote:
> 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@huawei.com>


Looks good to me. Feel free to add:

Reviewed-by: Jan Kara <jack@suse.cz>

								Honza

> ---
>  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..9f62da7471c9 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(get_desc_trans_len(desc), log_blocks);
>  	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(j - 1, &bhlist[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..a5ffec0c7517 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) < 0) {
>  		reiserfs_warning(s, "reiserfs-2504", "error reading the super");
>  		return 1;
>  	}
> -- 
> 2.31.1
>
Christoph Hellwig Sept. 5, 2022, 5:55 a.m. UTC | #2 
Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>
diff mbox series

Patch

diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
index 94addfcefede..9f62da7471c9 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(get_desc_trans_len(desc), log_blocks);
 	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(j - 1, &bhlist[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..a5ffec0c7517 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) < 0) {
 		reiserfs_warning(s, "reiserfs-2504", "error reading the super");
 		return 1;
 	}