dm/ebs: Change 'int rw' into 'enum req_op op'

Improve static type checking by using type 'enum req_op' instead of 'int'.
Make the role of the 'rw' arguments more clear by renaming these into
'op' (operation). This patch does not change any functionality since
REQ_OP_READ = READ = 0 and REQ_OP_WRITE = WRITE = 1.

Cc: Alasdair Kergon <agk@redhat.com>
Cc: Mike Snitzer <snitzer@kernel.org>
Cc: Heinz Mauelshagen <heinzm@redhat.com>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20220714180729.1065367-25-bvanassche@acm.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/md/dm-ebs-target.c b/drivers/md/dm-ebs-target.c
index 0221fa63f888f74f06f1a324d056304dd1143d8a..223e8e1a7a1397515c9274f309a06de8f1664b9c 100644 (file)
--- a/drivers/md/dm-ebs-target.c
+++ b/drivers/md/dm-ebs-target.c
@@ -61,7 +61,8 @@ static inline bool __ebs_check_bs(unsigned int bs)
  *
  * copy blocks between bufio blocks and bio vector's (partial/overlapping) pages.
  */
-static int __ebs_rw_bvec(struct ebs_c *ec, int rw, struct bio_vec *bv, struct bvec_iter *iter)
+static int __ebs_rw_bvec(struct ebs_c *ec, enum req_op op, struct bio_vec *bv,
+                        struct bvec_iter *iter)
 {
        int r = 0;
        unsigned char *ba, *pa;
@@ -81,7 +82,7 @@ static int __ebs_rw_bvec(struct ebs_c *ec, int rw, struct bio_vec *bv, struct bv
                cur_len = min(dm_bufio_get_block_size(ec->bufio) - buf_off, bv_len);
 
                /* Avoid reading for writes in case bio vector's page overwrites block completely. */
-               if (rw == READ || buf_off || bv_len < dm_bufio_get_block_size(ec->bufio))
+               if (op == REQ_OP_READ || buf_off || bv_len < dm_bufio_get_block_size(ec->bufio))
                        ba = dm_bufio_read(ec->bufio, block, &b);
                else
                        ba = dm_bufio_new(ec->bufio, block, &b);
@@ -95,7 +96,7 @@ static int __ebs_rw_bvec(struct ebs_c *ec, int rw, struct bio_vec *bv, struct bv
                } else {
                        /* Copy data to/from bio to buffer if read/new was successful above. */
                        ba += buf_off;
-                       if (rw == READ) {
+                       if (op == REQ_OP_READ) {
                                memcpy(pa, ba, cur_len);
                                flush_dcache_page(bv->bv_page);
                        } else {
@@ -117,14 +118,14 @@ static int __ebs_rw_bvec(struct ebs_c *ec, int rw, struct bio_vec *bv, struct bv
 }
 
 /* READ/WRITE: iterate bio vector's copying between (partial) pages and bufio blocks. */
-static int __ebs_rw_bio(struct ebs_c *ec, int rw, struct bio *bio)
+static int __ebs_rw_bio(struct ebs_c *ec, enum req_op op, struct bio *bio)
 {
        int r = 0, rr;
        struct bio_vec bv;
        struct bvec_iter iter;
 
        bio_for_each_bvec(bv, bio, iter) {
-               rr = __ebs_rw_bvec(ec, rw, &bv, &iter);
+               rr = __ebs_rw_bvec(ec, op, &bv, &iter);
                if (rr)
                        r = rr;
        }
@@ -205,10 +206,10 @@ static void __ebs_process_bios(struct work_struct *ws)
        bio_list_for_each(bio, &bios) {
                r = -EIO;
                if (bio_op(bio) == REQ_OP_READ)
-                       r = __ebs_rw_bio(ec, READ, bio);
+                       r = __ebs_rw_bio(ec, REQ_OP_READ, bio);
                else if (bio_op(bio) == REQ_OP_WRITE) {
                        write = true;
-                       r = __ebs_rw_bio(ec, WRITE, bio);
+                       r = __ebs_rw_bio(ec, REQ_OP_WRITE, bio);
                } else if (bio_op(bio) == REQ_OP_DISCARD) {
                        __ebs_forget_bio(ec, bio);
                        r = __ebs_discard_bio(ec, bio);