[PATCH v2 12/14] fs/buffer: remove ll_rw_block() helper

Zhang Yi
2022-09-01T13:24:17Z

Now that all ll_rw_block() users has been replaced to new safe helpers,
we just remove it here.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
---
fs/buffer.c | 63 +++----------------------------------
include/linux/buffer_head.h | 1 -
2 files changed, 4 insertions(+), 60 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index aec568b3ae52..2cccc7586b99 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -152,7 +152,7 @@ static void __end_buffer_read_notouch(struct buffer_head *bh, int uptodate)

/*
* Default synchronous end-of-IO handler.. Just mark it up-to-date and
- * unlock the buffer. This is what ll_rw_block uses too.
+ * unlock the buffer.
*/
void end_buffer_read_sync(struct buffer_head *bh, int uptodate)
{
@@ -491,8 +491,8 @@ int inode_has_buffers(struct inode *inode)
* all already-submitted IO to complete, but does not queue any new
* writes to the disk.
*
- * To do O_SYNC writes, just queue the buffer writes with ll_rw_block as
- * you dirty the buffers, and then use osync_inode_buffers to wait for
+ * To do O_SYNC writes, just queue the buffer writes with write_dirty_buffer
+ * as you dirty the buffers, and then use osync_inode_buffers to wait for
* completion. Any other dirty buffers which are not yet queued for
* write will not be flushed to disk by the osync.
*/
@@ -1806,7 +1806,7 @@ int __block_write_full_page(struct inode *inode, struct page *page,
/*
* The page was marked dirty, but the buffers were
* clean. Someone wrote them back by hand with
- * ll_rw_block/submit_bh. A rare case.
+ * write_dirty_buffer/submit_bh. A rare case.
*/
end_page_writeback(page);

@@ -2713,61 +2713,6 @@ int submit_bh(blk_opf_t opf, struct buffer_head *bh)
}
EXPORT_SYMBOL(submit_bh);

-/**
- * ll_rw_block: low-level access to block devices (DEPRECATED)
- * @opf: block layer request operation and flags.
- * @nr: number of &struct buffer_heads in the array
- * @bhs: array of pointers to &struct buffer_head
- *
- * ll_rw_block() takes an array of pointers to &struct buffer_heads, and
- * requests an I/O operation on them, either a %REQ_OP_READ or a %REQ_OP_WRITE.
- * @opf contains flags modifying the detailed I/O behavior, most notably
- * %REQ_RAHEAD.
- *
- * This function drops any buffer that it cannot get a lock on (with the
- * BH_Lock state bit), any buffer that appears to be clean when doing a write
- * request, and any buffer that appears to be up-to-date when doing read
- * request. Further it marks as clean buffers that are processed for
- * writing (the buffer cache won't assume that they are actually clean
- * until the buffer gets unlocked).
- *
- * ll_rw_block sets b_end_io to simple completion handler that marks
- * the buffer up-to-date (if appropriate), unlocks the buffer and wakes
- * any waiters.
- *
- * All of the buffers must be for the same device, and must also be a
- * multiple of the current approved size for the device.
- */
-void ll_rw_block(const blk_opf_t opf, int nr, struct buffer_head *bhs[])
-{
- const enum req_op op = opf & REQ_OP_MASK;
- int i;
-
- for (i = 0; i < nr; i++) {
- struct buffer_head *bh = bhs[i];
-
- if (!trylock_buffer(bh))
- continue;
- if (op == REQ_OP_WRITE) {
- if (test_clear_buffer_dirty(bh)) {
- bh->b_end_io = end_buffer_write_sync;
- get_bh(bh);
- submit_bh(opf, bh);
- continue;
- }
- } else {
- if (!buffer_uptodate(bh)) {
- bh->b_end_io = end_buffer_read_sync;
- get_bh(bh);
- submit_bh(opf, bh);
- continue;
- }
- }
- unlock_buffer(bh);
- }
-}
-EXPORT_SYMBOL(ll_rw_block);
-
void write_dirty_buffer(struct buffer_head *bh, blk_opf_t op_flags)
{
lock_buffer(bh);
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 6d09785bed9f..b415d8bc2a09 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -223,7 +223,6 @@ struct buffer_head *alloc_buffer_head(gfp_t gfp_flags);
void free_buffer_head(struct buffer_head * bh);
void unlock_buffer(struct buffer_head *bh);
void __lock_buffer(struct buffer_head *bh);
-void ll_rw_block(blk_opf_t, int, struct buffer_head * bh[]);
int sync_dirty_buffer(struct buffer_head *bh);
int __sync_dirty_buffer(struct buffer_head *bh, blk_opf_t op_flags);
void write_dirty_buffer(struct buffer_head *bh, blk_opf_t op_flags);
--
2.31.1