Merge branch 'fixes-2.6.39' into for-2.6.40

[firefly-linux-kernel-4.4.55.git] / drivers / md / dm-io.c

diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index 0590c75b0ab68e7f49a9f7d0adfa82f09fa2badf..76a5af00a26b5b52ce45a72bc0e58d6744d33468 100644 (file)
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -31,7 +31,6 @@ struct dm_io_client {
  */
 struct io {
        unsigned long error_bits;
-       unsigned long eopnotsupp_bits;
        atomic_t count;
        struct task_struct *sleeper;
        struct dm_io_client *client;
@@ -130,11 +129,8 @@ static void retrieve_io_and_region_from_bio(struct bio *bio, struct io **io,
  *---------------------------------------------------------------*/
 static void dec_count(struct io *io, unsigned int region, int error)
 {
-       if (error) {
+       if (error)
                set_bit(region, &io->error_bits);
-               if (error == -EOPNOTSUPP)
-                       set_bit(region, &io->eopnotsupp_bits);
-       }
 
        if (atomic_dec_and_test(&io->count)) {
                if (io->sleeper)
@@ -310,8 +306,8 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where,
        sector_t remaining = where->count;
 
        /*
-        * where->count may be zero if rw holds a write barrier and we
-        * need to send a zero-sized barrier.
+        * where->count may be zero if rw holds a flush and we need to
+        * send a zero-sized flush.
         */
        do {
                /*
@@ -356,7 +352,7 @@ static void dispatch_io(int rw, unsigned int num_regions,
        BUG_ON(num_regions > DM_IO_MAX_REGIONS);
 
        if (sync)
-               rw |= REQ_SYNC | REQ_UNPLUG;
+               rw |= REQ_SYNC;
 
        /*
         * For multiple regions we need to be careful to rewind
@@ -364,7 +360,7 @@ static void dispatch_io(int rw, unsigned int num_regions,
         */
        for (i = 0; i < num_regions; i++) {
                *dp = old_pages;
-               if (where[i].count || (rw & REQ_HARDBARRIER))
+               if (where[i].count || (rw & REQ_FLUSH))
                        do_region(rw, i, where + i, dp, io);
        }
 
@@ -393,9 +389,7 @@ static int sync_io(struct dm_io_client *client, unsigned int num_regions,
                return -EIO;
        }
 
-retry:
        io->error_bits = 0;
-       io->eopnotsupp_bits = 0;
        atomic_set(&io->count, 1); /* see dispatch_io() */
        io->sleeper = current;
        io->client = client;
@@ -412,11 +406,6 @@ retry:
        }
        set_current_state(TASK_RUNNING);
 
-       if (io->eopnotsupp_bits && (rw & REQ_HARDBARRIER)) {
-               rw &= ~REQ_HARDBARRIER;
-               goto retry;
-       }
-
        if (error_bits)
                *error_bits = io->error_bits;
 
@@ -437,7 +426,6 @@ static int async_io(struct dm_io_client *client, unsigned int num_regions,
 
        io = mempool_alloc(client->pool, GFP_NOIO);
        io->error_bits = 0;
-       io->eopnotsupp_bits = 0;
        atomic_set(&io->count, 1); /* see dispatch_io() */
        io->sleeper = NULL;
        io->client = client;