[PATCH] md: Don't assume that READ==0 and WRITE==1 - use the names explicitly

Thanks Jens for alerting me to this.

Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: <raziebe@gmail.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 15 insertions, 15 deletions

diff --git a/drivers/md/faulty.c b/drivers/md/faulty.c
index a7a5ab554338..4ebd0f2a75ec 100644
--- a/drivers/md/faulty.c
+++ b/drivers/md/faulty.c
@@ -173,7 +173,7 @@ static int make_request(request_queue_t *q, struct bio *bio)
         conf_t *conf = (conf_t*)mddev->private;
         int failit = 0;
 
-        if (bio->bi_rw & 1) {
+        if (bio_data_dir(bio) == WRITE) {
                 /* write request */
                 if (atomic_read(&conf->counters[WriteAll])) {
                         /* special case - don't decrement, don't generic_make_request,
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index b3c5e12f081d..b30f74be3982 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1736,7 +1736,7 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
                 /* take from bio_init */
                 bio->bi_next = NULL;
                 bio->bi_flags |= 1 << BIO_UPTODATE;
-                bio->bi_rw = 0;
+                bio->bi_rw = READ;
                 bio->bi_vcnt = 0;
                 bio->bi_idx = 0;
                 bio->bi_phys_segments = 0;
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 7492d6033ac6..f0141910bb8d 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1785,7 +1785,7 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
                                                 biolist = bio;
                                                 bio->bi_private = r10_bio;
                                                 bio->bi_end_io = end_sync_read;
-                                                bio->bi_rw = 0;
+                                                bio->bi_rw = READ;
                                                 bio->bi_sector = r10_bio->devs[j].addr +
                                                         conf->mirrors[d].rdev->data_offset;
                                                 bio->bi_bdev = conf->mirrors[d].rdev->bdev;
@@ -1801,7 +1801,7 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
                                                 biolist = bio;
                                                 bio->bi_private = r10_bio;
                                                 bio->bi_end_io = end_sync_write;
-                                                bio->bi_rw = 1;
+                                                bio->bi_rw = WRITE;
                                                 bio->bi_sector = r10_bio->devs[k].addr +
                                                         conf->mirrors[i].rdev->data_offset;
                                                 bio->bi_bdev = conf->mirrors[i].rdev->bdev;
@@ -1870,7 +1870,7 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
                         biolist = bio;
                         bio->bi_private = r10_bio;
                         bio->bi_end_io = end_sync_read;
-                        bio->bi_rw = 0;
+                        bio->bi_rw = READ;
                         bio->bi_sector = r10_bio->devs[i].addr +
                                 conf->mirrors[d].rdev->data_offset;
                         bio->bi_bdev = conf->mirrors[d].rdev->bdev;
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 377f8bc9b78b..be008f034ada 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1827,16 +1827,16 @@ static void handle_stripe5(struct stripe_head *sh)
                 struct bio *bi;
                 mdk_rdev_t *rdev;
                 if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags))
-                        rw = 1;
+                        rw = WRITE;
                 else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags))
-                        rw = 0;
+                        rw = READ;
                 else
                         continue;
  
                 bi = &sh->dev[i].req;
  
                 bi->bi_rw = rw;
-                if (rw)
+                if (rw == WRITE)
                         bi->bi_end_io = raid5_end_write_request;
                 else
                         bi->bi_end_io = raid5_end_read_request;
@@ -1872,7 +1872,7 @@ static void handle_stripe5(struct stripe_head *sh)
                                 atomic_add(STRIPE_SECTORS, &rdev->corrected_errors);
                         generic_make_request(bi);
                 } else {
-                        if (rw == 1)
+                        if (rw == WRITE)
                                 set_bit(STRIPE_DEGRADED, &sh->state);
                         PRINTK("skip op %ld on disc %d for sector %llu\n",
                                 bi->bi_rw, i, (unsigned long long)sh->sector);
@@ -2370,16 +2370,16 @@ static void handle_stripe6(struct stripe_head *sh, struct page *tmp_page)
                 struct bio *bi;
                 mdk_rdev_t *rdev;
                 if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags))
-                        rw = 1;
+                        rw = WRITE;
                 else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags))
-                        rw = 0;
+                        rw = READ;
                 else
                         continue;
 
                 bi = &sh->dev[i].req;
 
                 bi->bi_rw = rw;
-                if (rw)
+                if (rw == WRITE)
                         bi->bi_end_io = raid5_end_write_request;
                 else
                         bi->bi_end_io = raid5_end_read_request;
@@ -2415,7 +2415,7 @@ static void handle_stripe6(struct stripe_head *sh, struct page *tmp_page)
                                 atomic_add(STRIPE_SECTORS, &rdev->corrected_errors);
                         generic_make_request(bi);
                 } else {
-                        if (rw == 1)
+                        if (rw == WRITE)
                                 set_bit(STRIPE_DEGRADED, &sh->state);
                         PRINTK("skip op %ld on disc %d for sector %llu\n",
                                 bi->bi_rw, i, (unsigned long long)sh->sector);
@@ -2567,7 +2567,7 @@ static int raid5_mergeable_bvec(request_queue_t *q, struct bio *bio, struct bio_
         unsigned int chunk_sectors = mddev->chunk_size >> 9;
         unsigned int bio_sectors = bio->bi_size >> 9;
 
-        if (bio_data_dir(bio))
+        if (bio_data_dir(bio) == WRITE)
                 return biovec->bv_len; /* always allow writes to be mergeable */
 
         max =  (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9;
@@ -2751,7 +2751,7 @@ static int make_request(request_queue_t *q, struct bio * bi)
         disk_stat_inc(mddev->gendisk, ios[rw]);
         disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bi));
 
-        if (bio_data_dir(bi) == READ &&
+        if (rw == READ &&
              mddev->reshape_position == MaxSector &&
              chunk_aligned_read(q,bi))
                 return 0;