bio: first step in sanitizing the bio->bi_rw flag testing

Get rid of any functions that test for these bits and make callers
use bio_rw_flagged() directly. Then it is at least directly apparent
what variable and flag they check.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/block/blk-core.c b/block/blk-core.c
index c822239..5255971 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1114,24 +1114,24 @@ void init_request_from_bio(struct request *req, struct bio *bio)
         * Inherit FAILFAST from bio (for read-ahead, and explicit
         * FAILFAST).  FAILFAST flags are identical for req and bio.
         */
-       if (bio_rw_ahead(bio))
+       if (bio_rw_flagged(bio, BIO_RW_AHEAD))
                req->cmd_flags |= REQ_FAILFAST_MASK;
        else
                req->cmd_flags |= bio->bi_rw & REQ_FAILFAST_MASK;
 
-       if (unlikely(bio_discard(bio))) {
+       if (unlikely(bio_rw_flagged(bio, BIO_RW_DISCARD))) {
                req->cmd_flags |= REQ_DISCARD;
-               if (bio_barrier(bio))
+               if (bio_rw_flagged(bio, BIO_RW_BARRIER))
                        req->cmd_flags |= REQ_SOFTBARRIER;
                req->q->prepare_discard_fn(req->q, req);
-       } else if (unlikely(bio_barrier(bio)))
+       } else if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER)))
                req->cmd_flags |= REQ_HARDBARRIER;
 
-       if (bio_sync(bio))
+       if (bio_rw_flagged(bio, BIO_RW_SYNCIO))
                req->cmd_flags |= REQ_RW_SYNC;
-       if (bio_rw_meta(bio))
+       if (bio_rw_flagged(bio, BIO_RW_META))
                req->cmd_flags |= REQ_RW_META;
-       if (bio_noidle(bio))
+       if (bio_rw_flagged(bio, BIO_RW_NOIDLE))
                req->cmd_flags |= REQ_NOIDLE;
 
        req->errors = 0;
@@ -1155,12 +1155,12 @@ static int __make_request(struct request_queue *q, struct bio *bio)
        int el_ret;
        unsigned int bytes = bio->bi_size;
        const unsigned short prio = bio_prio(bio);
-       const int sync = bio_sync(bio);
-       const int unplug = bio_unplug(bio);
+       const bool sync = bio_rw_flagged(bio, BIO_RW_SYNCIO);
+       const bool unplug = bio_rw_flagged(bio, BIO_RW_UNPLUG);
        const unsigned int ff = bio->bi_rw & REQ_FAILFAST_MASK;
        int rw_flags;
 
-       if (bio_barrier(bio) && bio_has_data(bio) &&
+       if (bio_rw_flagged(bio, BIO_RW_BARRIER) && bio_has_data(bio) &&
            (q->next_ordered == QUEUE_ORDERED_NONE)) {
                bio_endio(bio, -EOPNOTSUPP);
                return 0;
@@ -1174,7 +1174,7 @@ static int __make_request(struct request_queue *q, struct bio *bio)
 
        spin_lock_irq(q->queue_lock);
 
-       if (unlikely(bio_barrier(bio)) || elv_queue_empty(q))
+       if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER)) || elv_queue_empty(q))
                goto get_rq;
 
        el_ret = elv_merge(q, &req, bio);
@@ -1470,7 +1470,8 @@ static inline void __generic_make_request(struct bio *bio)
                if (bio_check_eod(bio, nr_sectors))
                        goto end_io;
 
-               if (bio_discard(bio) && !q->prepare_discard_fn) {
+               if (bio_rw_flagged(bio, BIO_RW_DISCARD) &&
+                   !q->prepare_discard_fn) {
                        err = -EOPNOTSUPP;
                        goto end_io;
                }

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index ca0d7e7..9e6d0af 100644 (file)
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -257,7 +257,7 @@ static inline void cic_set_cfqq(struct cfq_io_context *cic,
  */
 static inline int cfq_bio_sync(struct bio *bio)
 {
-       if (bio_data_dir(bio) == READ || bio_sync(bio))
+       if (bio_data_dir(bio) == READ || bio_rw_flagged(bio, BIO_RW_SYNCIO))
                return 1;
 
        return 0;

diff --git a/block/elevator.c b/block/elevator.c
index ca86192..1975b61 100644 (file)
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -79,7 +79,8 @@ int elv_rq_merge_ok(struct request *rq, struct bio *bio)
        /*
         * Don't merge file system requests and discard requests
         */
-       if (bio_discard(bio) != bio_discard(rq->bio))
+       if (bio_rw_flagged(bio, BIO_RW_DISCARD) !=
+           bio_rw_flagged(rq->bio, BIO_RW_DISCARD))
                return 0;
 
        /*

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 5757188..bbb7944 100644 (file)
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -475,7 +475,7 @@ static int do_bio_filebacked(struct loop_device *lo, struct bio *bio)
        pos = ((loff_t) bio->bi_sector << 9) + lo->lo_offset;
 
        if (bio_rw(bio) == WRITE) {
-               int barrier = bio_barrier(bio);
+               bool barrier = bio_rw_flagged(bio, BIO_RW_BARRIER);
                struct file *file = lo->lo_backing_file;
 
                if (barrier) {

diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 33f179e..cc9dc79 100644 (file)
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -1129,7 +1129,7 @@ static int mirror_end_io(struct dm_target *ti, struct bio *bio,
        if (error == -EOPNOTSUPP)
                goto out;
 
-       if ((error == -EWOULDBLOCK) && bio_rw_ahead(bio))
+       if ((error == -EWOULDBLOCK) && bio_rw_flagged(bio, BIO_RW_AHEAD))
                goto out;
 
        if (unlikely(error)) {

diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index 3e563d2..fde658c 100644 (file)
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -285,7 +285,7 @@ static int stripe_end_io(struct dm_target *ti, struct bio *bio,
        if (!error)
                return 0; /* I/O complete */
 
-       if ((error == -EWOULDBLOCK) && bio_rw_ahead(bio))
+       if ((error == -EWOULDBLOCK) && bio_rw_flagged(bio, BIO_RW_AHEAD))
                return error;
 
        if (error == -EOPNOTSUPP)

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index b4845b1..ec012f0 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -586,7 +586,7 @@ static void dec_pending(struct dm_io *io, int error)
                         */
                        spin_lock_irqsave(&md->deferred_lock, flags);
                        if (__noflush_suspending(md)) {
-                               if (!bio_barrier(io->bio))
+                               if (!bio_rw_flagged(io->bio, BIO_RW_BARRIER))
                                        bio_list_add_head(&md->deferred,
                                                          io->bio);
                        } else
@@ -598,7 +598,7 @@ static void dec_pending(struct dm_io *io, int error)
                io_error = io->error;
                bio = io->bio;
 
-               if (bio_barrier(bio)) {
+               if (bio_rw_flagged(bio, BIO_RW_BARRIER)) {
                        /*
                         * There can be just one barrier request so we use
                         * a per-device variable for error reporting.
@@ -1209,7 +1209,7 @@ static void __split_and_process_bio(struct mapped_device *md, struct bio *bio)
 
        ci.map = dm_get_table(md);
        if (unlikely(!ci.map)) {
-               if (!bio_barrier(bio))
+               if (!bio_rw_flagged(bio, BIO_RW_BARRIER))
                        bio_io_error(bio);
                else
                        if (!md->barrier_error)
@@ -1321,7 +1321,7 @@ static int _dm_request(struct request_queue *q, struct bio *bio)
         * we have to queue this io for later.
         */
        if (unlikely(test_bit(DMF_QUEUE_IO_TO_THREAD, &md->flags)) ||
-           unlikely(bio_barrier(bio))) {
+           unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER))) {
                up_read(&md->io_lock);
 
                if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) &&
@@ -1344,7 +1344,7 @@ static int dm_make_request(struct request_queue *q, struct bio *bio)
 {
        struct mapped_device *md = q->queuedata;
 
-       if (unlikely(bio_barrier(bio))) {
+       if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER))) {
                bio_endio(bio, -EOPNOTSUPP);
                return 0;
        }
@@ -2164,7 +2164,7 @@ static void dm_wq_work(struct work_struct *work)
                if (dm_request_based(md))
                        generic_make_request(c);
                else {
-                       if (bio_barrier(c))
+                       if (bio_rw_flagged(c, BIO_RW_BARRIER))
                                process_barrier(md, c);
                        else
                                __split_and_process_bio(md, c);

diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 5fe39c2..ea48429 100644 (file)
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -288,7 +288,7 @@ static int linear_make_request (struct request_queue *q, struct bio *bio)
        sector_t start_sector;
        int cpu;
 
-       if (unlikely(bio_barrier(bio))) {
+       if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER))) {
                bio_endio(bio, -EOPNOTSUPP);
                return 0;
        }

diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index 7140909..89e7681 100644 (file)
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -90,7 +90,7 @@ static void multipath_end_request(struct bio *bio, int error)
 
        if (uptodate)
                multipath_end_bh_io(mp_bh, 0);
-       else if (!bio_rw_ahead(bio)) {
+       else if (!bio_rw_flagged(bio, BIO_RW_AHEAD)) {
                /*
                 * oops, IO error:
                 */
@@ -144,7 +144,7 @@ static int multipath_make_request (struct request_queue *q, struct bio * bio)
        const int rw = bio_data_dir(bio);
        int cpu;
 
-       if (unlikely(bio_barrier(bio))) {
+       if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER))) {
                bio_endio(bio, -EOPNOTSUPP);
                return 0;
        }

diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 898e2bd..f845ed9 100644 (file)
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -448,7 +448,7 @@ static int raid0_make_request(struct request_queue *q, struct bio *bio)
        const int rw = bio_data_dir(bio);
        int cpu;
 
-       if (unlikely(bio_barrier(bio))) {
+       if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER))) {
                bio_endio(bio, -EOPNOTSUPP);
                return 0;
        }

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 8726fd7..ff7ed33 100644 (file)
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -782,8 +782,9 @@ static int make_request(struct request_queue *q, struct bio * bio)
        struct bio_list bl;
        struct page **behind_pages = NULL;
        const int rw = bio_data_dir(bio);
-       const int do_sync = bio_sync(bio);
-       int cpu, do_barriers;
+       const bool do_sync = bio_rw_flagged(bio, BIO_RW_SYNCIO);
+       int cpu;
+       bool do_barriers;
        mdk_rdev_t *blocked_rdev;
 
        /*
@@ -797,7 +798,8 @@ static int make_request(struct request_queue *q, struct bio * bio)
 
        md_write_start(mddev, bio); /* wait on superblock update early */
 
-       if (unlikely(!mddev->barriers_work && bio_barrier(bio))) {
+       if (unlikely(!mddev->barriers_work &&
+                    bio_rw_flagged(bio, BIO_RW_BARRIER))) {
                if (rw == WRITE)
                        md_write_end(mddev);
                bio_endio(bio, -EOPNOTSUPP);
@@ -925,7 +927,7 @@ static int make_request(struct request_queue *q, struct bio * bio)
        atomic_set(&r1_bio->remaining, 0);
        atomic_set(&r1_bio->behind_remaining, 0);
 
-       do_barriers = bio_barrier(bio);
+       do_barriers = bio_rw_flagged(bio, BIO_RW_BARRIER);
        if (do_barriers)
                set_bit(R1BIO_Barrier, &r1_bio->state);
 
@@ -1600,7 +1602,7 @@ static void raid1d(mddev_t *mddev)
                         * We already have a nr_pending reference on these rdevs.
                         */
                        int i;
-                       const int do_sync = bio_sync(r1_bio->master_bio);
+                       const bool do_sync = bio_rw_flagged(r1_bio->master_bio, BIO_RW_SYNCIO);
                        clear_bit(R1BIO_BarrierRetry, &r1_bio->state);
                        clear_bit(R1BIO_Barrier, &r1_bio->state);
                        for (i=0; i < conf->raid_disks; i++)
@@ -1654,7 +1656,7 @@ static void raid1d(mddev_t *mddev)
                                       (unsigned long long)r1_bio->sector);
                                raid_end_bio_io(r1_bio);
                        } else {
-                               const int do_sync = bio_sync(r1_bio->master_bio);
+                               const bool do_sync = bio_rw_flagged(r1_bio->master_bio, BIO_RW_SYNCIO);
                                r1_bio->bios[r1_bio->read_disk] =
                                        mddev->ro ? IO_BLOCKED : NULL;
                                r1_bio->read_disk = disk;

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 3d9020c..d0a2152 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -796,12 +796,12 @@ static int make_request(struct request_queue *q, struct bio * bio)
        int i;
        int chunk_sects = conf->chunk_mask + 1;
        const int rw = bio_data_dir(bio);
-       const int do_sync = bio_sync(bio);
+       const bool do_sync = bio_rw_flagged(bio, BIO_RW_SYNCIO);
        struct bio_list bl;
        unsigned long flags;
        mdk_rdev_t *blocked_rdev;
 
-       if (unlikely(bio_barrier(bio))) {
+       if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER))) {
                bio_endio(bio, -EOPNOTSUPP);
                return 0;
        }
@@ -1610,7 +1610,7 @@ static void raid10d(mddev_t *mddev)
                                raid_end_bio_io(r10_bio);
                                bio_put(bio);
                        } else {
-                               const int do_sync = bio_sync(r10_bio->master_bio);
+                               const bool do_sync = bio_rw_flagged(r10_bio->master_bio, BIO_RW_SYNCIO);
                                bio_put(bio);
                                rdev = conf->mirrors[mirror].rdev;
                                if (printk_ratelimit())

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index b8a2c5d..826eb34 100644 (file)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3606,7 +3606,7 @@ static int make_request(struct request_queue *q, struct bio * bi)
        const int rw = bio_data_dir(bi);
        int cpu, remaining;
 
-       if (unlikely(bio_barrier(bi))) {
+       if (unlikely(bio_rw_flagged(bi, BIO_RW_BARRIER))) {
                bio_endio(bi, -EOPNOTSUPP);
                return 0;
        }

diff --git a/drivers/staging/dst/dcore.c b/drivers/staging/dst/dcore.c
index fad25b7..b1c258c 100644 (file)
--- a/drivers/staging/dst/dcore.c
+++ b/drivers/staging/dst/dcore.c
@@ -112,8 +112,9 @@ static int dst_request(struct request_queue *q, struct bio *bio)
                 * I worked with.
                 *
                 * Empty barriers are not allowed anyway, see 51fd77bd9f512
-                * for example, although later it was changed to bio_discard()
-                * only, which does not work in this case.
+                * for example, although later it was changed to
+                * bio_rw_flagged(bio, BIO_RW_DISCARD) only, which does not
+                * work in this case.
                 */
                //err = -EOPNOTSUPP;
                err = 0;

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 5dbefd1..5cf405b 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -260,7 +260,7 @@ loop_lock:
                num_run++;
                batch_run++;
 
-               if (bio_sync(cur))
+               if (bio_rw_flagged(cur, BIO_RW_SYNCIO))
                        num_sync_run++;
 
                if (need_resched()) {
@@ -2903,7 +2903,7 @@ static noinline int schedule_bio(struct btrfs_root *root,
        bio->bi_rw |= rw;
 
        spin_lock(&device->io_lock);
-       if (bio_sync(bio))
+       if (bio_rw_flagged(bio, BIO_RW_SYNCIO))
                pending_bios = &device->pending_sync_bios;
        else
                pending_bios = &device->pending_bios;

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 4f8fd02..5be93f1 100644 (file)
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -177,29 +177,18 @@ enum bio_rw_flags {
        BIO_RW_NOIDLE,
 };
 
+/*
+ * First four bits must match between bio->bi_rw and rq->cmd_flags, make
+ * that explicit here.
+ */
+#define BIO_RW_RQ_MASK         0xf
+
 static inline bool bio_rw_flagged(struct bio *bio, enum bio_rw_flags flag)
 {
        return (bio->bi_rw & (1 << flag)) != 0;
 }
 
 /*
- * Old defines, these should eventually be replaced by direct usage of
- * bio_rw_flagged()
- */
-#define bio_barrier(bio)       bio_rw_flagged(bio, BIO_RW_BARRIER)
-#define bio_sync(bio)          bio_rw_flagged(bio, BIO_RW_SYNCIO)
-#define bio_unplug(bio)                bio_rw_flagged(bio, BIO_RW_UNPLUG)
-#define bio_failfast_dev(bio)  bio_rw_flagged(bio, BIO_RW_FAILFAST_DEV)
-#define bio_failfast_transport(bio)    \
-               bio_rw_flagged(bio, BIO_RW_FAILFAST_TRANSPORT)
-#define bio_failfast_driver(bio)       \
-               bio_rw_flagged(bio, BIO_RW_FAILFAST_DRIVER)
-#define bio_rw_ahead(bio)      bio_rw_flagged(bio, BIO_RW_AHEAD)
-#define bio_rw_meta(bio)       bio_rw_flagged(bio, BIO_RW_META)
-#define bio_discard(bio)       bio_rw_flagged(bio, BIO_RW_DISCARD)
-#define bio_noidle(bio)                bio_rw_flagged(bio, BIO_RW_NOIDLE)
-
-/*
  * upper 16 bits of bi_rw define the io priority of this bio
  */
 #define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS)
@@ -222,7 +211,7 @@ static inline bool bio_rw_flagged(struct bio *bio, enum bio_rw_flags flag)
 #define bio_offset(bio)                bio_iovec((bio))->bv_offset
 #define bio_segments(bio)      ((bio)->bi_vcnt - (bio)->bi_idx)
 #define bio_sectors(bio)       ((bio)->bi_size >> 9)
-#define bio_empty_barrier(bio) (bio_barrier(bio) && !bio_has_data(bio) && !bio_discard(bio))
+#define bio_empty_barrier(bio) (bio_rw_flagged(bio, BIO_RW_BARRIER) && !bio_has_data(bio) && !bio_rw_flagged(bio, BIO_RW_DISCARD))
 
 static inline unsigned int bio_cur_bytes(struct bio *bio)
 {

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 650b6a9..88edb62 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -86,7 +86,7 @@ enum {
 };
 
 /*
- * request type modified bits. first two bits match BIO_RW* bits, important
+ * request type modified bits. first four bits match BIO_RW* bits, important
  */
 enum rq_flag_bits {
        __REQ_RW,               /* not set, read. set, write */