btrfs: Check for missing device before bio submission in btrfs_map_bio

Before btrfs_map_bio submits all stripe bios it does a number of checks
to ensure the device for every stripe is present. However, it doesn't do
a DEV_STATE_MISSING check, instead this is relegated to the lower level
btrfs_schedule_bio (in the async submission case, sync submission
doesn't check DEV_STATE_MISSING at all). Additionally
btrfs_schedule_bios does the duplicate device->bdev check which has
already been performed in btrfs_map_bio.

This patch moves the DEV_STATE_MISSING check in btrfs_map_bio and
removes the duplicate device->bdev check. Doing so ensures that no bio
cloning/submission happens for both async/sync requests in the face of
missing device. This makes the async io submission path slightly shorter
in terms of instruction count. No functional changes.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index e392ca5..bb76263 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -6109,12 +6109,6 @@ static noinline void btrfs_schedule_bio(struct btrfs_device *device,
        int should_queue = 1;
        struct btrfs_pending_bios *pending_bios;
 
-       if (test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state) ||
-           !device->bdev) {
-               bio_io_error(bio);
-               return;
-       }
-
        /* don't bother with additional async steps for reads, right now */
        if (bio_op(bio) == REQ_OP_READ) {
                btrfsic_submit_bio(bio);
@@ -6243,7 +6237,8 @@ blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
 
        for (dev_nr = 0; dev_nr < total_devs; dev_nr++) {
                dev = bbio->stripes[dev_nr].dev;
-               if (!dev || !dev->bdev ||
+               if (!dev || !dev->bdev || test_bit(BTRFS_DEV_STATE_MISSING,
+                                                  &dev->dev_state) ||
                    (bio_op(first_bio) == REQ_OP_WRITE &&
                    !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))) {
                        bbio_error(bbio, first_bio, logical);