Extern or forward variable declaration at include/linux/blkdev.h, line 258 References: arch/m68k/emu/nfblock.c, line 64 arch/um/drivers/ubd_kern.c, line 1258 arch/xtensa/platforms/iss/simdisk.c, line 106 block/bio-integrity.c, line 127 block/bio-integrity.c, line 162 block/bio-integrity.c, line 416 block/bio-integrity.c, line 462 block/bio.c, line 157 block/bio.c, line 177 block/bio.c, line 197 block/bio.c, line 251 block/bio.c, line 477 block/bio.c, line 531 block/bio.c, line 551 block/bio.c, line 775 block/bio.c, line 803 block/bio.c, line 832 block/bio.c, line 948 block/bio.c, line 977 block/bio.c, line 1021 block/bio.c, line 1039 block/bio.c, line 1072 block/bio.c, line 1088 block/bio.c, line 1135 block/bio.c, line 1288 block/bio.c, line 1289 block/bio.c, line 1322 block/bio.c, line 1361 block/bio.c, line 1409 block/bio.c, line 1631 block/bio.c, line 1738 block/blk-core.c, line 1496 block/blk-crypto-fallback.c, line 165 block/blk-crypto-fallback.c, line 217 block/blk-crypto-fallback.c, line 318 block/blk-crypto-fallback.c, line 389 block/blk-crypto.c, line 209 block/blk-integrity.c, line 29 block/blk-integrity.c, line 71 block/blk-map.c, line 48 block/blk-map.c, line 79 block/blk-map.c, line 399 block/blk-map.c, line 485 block/blk-merge.c, line 19 block/blk-merge.c, line 198 block/blk-merge.c, line 250 block/blk-merge.c, line 379 block/blk-merge.c, line 425 block/blk-merge.c, line 459 block/blk-merge.c, line 469 block/blk-merge.c, line 470 block/blk-merge.c, line 493 block/blk.h, line 58 block/blk.h, line 60 block/blk.h, line 63 block/blk.h, line 63 block/blk.h, line 79 block/blk.h, line 90 block/bounce.c, line 77 block/bounce.c, line 104 block/bounce.c, line 143 block/bounce.c, line 213 block/fops.c, line 59 block/fops.c, line 73 block/t10-pi.c, line 142 block/t10-pi.c, line 192 drivers/block/aoe/aoecmd.c, line 300 drivers/block/aoe/aoecmd.c, line 1017 drivers/block/brd.c, line 289 drivers/block/drbd/drbd_main.c, line 1580 drivers/block/drbd/drbd_main.c, line 1602 drivers/block/drbd/drbd_receiver.c, line 2012 drivers/block/drbd/drbd_worker.c, line 319 drivers/block/floppy.c, line 2431 drivers/block/floppy.c, line 4117 drivers/block/floppy.c, line 4117 drivers/block/floppy.c, line 4129 drivers/block/loop.c, line 320 drivers/block/loop.c, line 345 drivers/block/loop.c, line 367 drivers/block/loop.c, line 397 drivers/block/loop.c, line 426 drivers/block/loop.c, line 570 drivers/block/loop.c, line 574 drivers/block/loop.c, line 584 drivers/block/loop.h, line 80 drivers/block/n64cart.c, line 62 drivers/block/n64cart.c, line 89 drivers/block/nbd.c, line 639 drivers/block/nbd.c, line 765 drivers/block/null_blk/main.c, line 1169 drivers/block/null_blk/main.c, line 1195 drivers/block/ps3disk.c, line 85 drivers/block/ps3disk.c, line 106 drivers/block/ps3vram.c, line 538 drivers/block/rbd.c, line 308 drivers/block/rbd.c, line 2713 drivers/block/rbd.c, line 2981 drivers/block/zram/zram_drv.c, line 59 drivers/block/zram/zram_drv.c, line 149 drivers/block/zram/zram_drv.c, line 154 drivers/block/zram/zram_drv.c, line 184 drivers/block/zram/zram_drv.c, line 585 drivers/block/zram/zram_drv.c, line 627 drivers/block/zram/zram_drv.c, line 627 drivers/block/zram/zram_drv.c, line 667 drivers/block/zram/zram_drv.c, line 720 drivers/block/zram/zram_drv.c, line 791 drivers/block/zram/zram_drv.c, line 810 drivers/block/zram/zram_drv.c, line 828 drivers/block/zram/zram_drv.c, line 836 drivers/block/zram/zram_drv.c, line 847 drivers/block/zram/zram_drv.c, line 1238 drivers/block/zram/zram_drv.c, line 1290 drivers/block/zram/zram_drv.c, line 1323 drivers/block/zram/zram_drv.c, line 1440 drivers/block/zram/zram_drv.c, line 1446 drivers/block/zram/zram_drv.c, line 1524 drivers/block/zram/zram_drv.c, line 1556 drivers/block/zram/zram_drv.c, line 1576 drivers/block/zram/zram_drv.c, line 1642 drivers/md/bcache/bcache.h, line 306 drivers/md/bcache/bcache.h, line 415 drivers/md/bcache/btree.c, line 376 drivers/md/bcache/debug.c, line 111 drivers/md/bcache/request.c, line 42 drivers/md/bcache/super.c, line 1933 drivers/md/dm-crypt.c, line 1287 drivers/md/dm-crypt.c, line 1288 drivers/md/dm-crypt.c, line 1383 drivers/md/dm-crypt.c, line 1384 drivers/md/dm-crypt.c, line 1707 drivers/md/dm-ebs-target.c, line 64 drivers/md/dm-ebs-target.c, line 123 drivers/md/dm-flakey.c, line 293 drivers/md/dm-integrity.c, line 1702 drivers/md/dm-integrity.c, line 1811 drivers/md/dm-integrity.c, line 1896 drivers/md/dm-integrity.c, line 1948 drivers/md/dm-integrity.c, line 2005 drivers/md/dm-io.c, line 211 drivers/md/dm-io.c, line 211 drivers/md/dm-io.c, line 226 drivers/md/dm-log-writes.c, line 130 drivers/md/dm-log-writes.c, line 671 drivers/md/dm-verity-target.c, line 382 drivers/md/dm-verity-target.c, line 428 drivers/md/dm-writecache.c, line 1249 drivers/md/md.c, line 994 drivers/md/raid1.c, line 2164 drivers/md/raid5-ppl.c, line 154 drivers/md/raid5.c, line 1310 drivers/nvdimm/blk.c, line 81 drivers/nvdimm/blk.c, line 171 drivers/nvdimm/btt.c, line 1156 drivers/nvdimm/btt.c, line 1449 drivers/nvdimm/pmem.c, line 199 drivers/nvme/host/pci.c, line 803 drivers/nvme/host/pci.c, line 822 drivers/nvme/host/pci.c, line 846 drivers/nvme/host/tcp.c, line 226 drivers/nvme/host/tcp.c, line 239 drivers/nvme/target/io-cmd-file.c, line 71 drivers/nvme/target/io-cmd-file.c, line 94 drivers/nvme/target/io-cmd-file.c, line 255 drivers/nvme/target/nvmet.h, line 325 drivers/nvme/target/nvmet.h, line 333 drivers/s390/block/dasd_diag.c, line 515 drivers/s390/block/dasd_eckd.c, line 3236 drivers/s390/block/dasd_eckd.c, line 3914 drivers/s390/block/dasd_eckd.c, line 4104 drivers/s390/block/dasd_eckd.c, line 4434 drivers/s390/block/dasd_eckd.c, line 4690 drivers/s390/block/dasd_eckd.c, line 4833 drivers/s390/block/dasd_fba.c, line 440 drivers/s390/block/dasd_fba.c, line 572 drivers/s390/block/dcssblk.c, line 861 drivers/s390/block/scm_blk.c, line 188 drivers/scsi/aha1542.c, line 268 drivers/scsi/aha1542.c, line 454 drivers/target/target_core_file.c, line 244 drivers/target/target_core_file.c, line 316 drivers/target/target_core_file.c, line 321 drivers/target/target_core_file.c, line 436 drivers/target/target_core_file.c, line 460 fs/9p/vfs_addr.c, line 41 fs/9p/vfs_addr.c, line 155 fs/afs/internal.h, line 115 fs/afs/write.c, line 955 fs/btrfs/check-integrity.c, line 2633 fs/btrfs/compression.c, line 265 fs/btrfs/compression.c, line 538 fs/btrfs/compression.c, line 1315 fs/btrfs/disk-io.c, line 459 fs/btrfs/disk-io.c, line 501 fs/btrfs/disk-io.c, line 878 fs/btrfs/disk-io.c, line 3700 fs/btrfs/extent_io.c, line 2814 fs/btrfs/extent_io.c, line 2978 fs/btrfs/extent_io.c, line 4376 fs/btrfs/extent_io.c, line 4432 fs/btrfs/file-item.c, line 328 fs/btrfs/file-item.c, line 632 fs/btrfs/inode.c, line 8085 fs/btrfs/raid56.c, line 1153 fs/btrfs/raid56.c, line 1428 fs/ceph/file.c, line 84 fs/ceph/file.c, line 107 fs/ceph/file.c, line 131 fs/ceph/file.c, line 133 fs/ceph/file.c, line 164 fs/ceph/file.c, line 1185 fs/cifs/cifsglob.h, line 1278 fs/cifs/connect.c, line 604 fs/cifs/misc.c, line 993 fs/cifs/smb2ops.c, line 4753 fs/cifs/smb2ops.c, line 4755 fs/cifs/smb2ops.c, line 4758 fs/cifs/smb2ops.c, line 4792 fs/cifs/transport.c, line 387 fs/erofs/zdata.c, line 815 fs/ext4/page-io.c, line 102 fs/ext4/readpage.c, line 73 fs/f2fs/data.c, line 125 fs/f2fs/data.c, line 181 fs/f2fs/data.c, line 230 fs/f2fs/data.c, line 300 fs/f2fs/data.c, line 553 fs/gfs2/lops.c, line 170 fs/gfs2/lops.c, line 205 fs/gfs2/lops.c, line 399 fs/gfs2/meta_io.c, line 194 fs/io_uring.c, line 207 fs/io_uring.c, line 2997 fs/iomap/buffered-io.c, line 173 fs/iomap/buffered-io.c, line 193 fs/iomap/buffered-io.c, line 528 fs/iomap/buffered-io.c, line 1036 fs/mpage.c, line 49 fs/splice.c, line 628 fs/splice.c, line 628 fs/splice.c, line 651 fs/squashfs/block.c, line 39 fs/squashfs/block.c, line 164 fs/zonefs/super.c, line 1536 fs/zonefs/super.c, line 1536 fs/zonefs/super.c, line 1544 include/linux/blkdev.h, line 157 include/linux/blkdev.h, line 258 include/linux/blkdev.h, line 1005 include/linux/blkdev.h, line 1733 include/linux/blkdev.h, line 1807 include/linux/device-mapper.h, line 22 mm/page_io.c, line 297 net/ceph/messenger.c, line 734 net/ceph/messenger.c, line 780 net/ceph/messenger.c, line 795 net/ceph/messenger.c, line 806 net/ceph/messenger_v1.c, line 43 net/ceph/messenger_v2.c, line 143 net/ceph/messenger_v2.c, line 230 net/ceph/messenger_v2.c, line 271 net/ceph/messenger_v2.c, line 852 net/ceph/messenger_v2.c, line 892 net/ceph/messenger_v2.c, line 944 net/ceph/messenger_v2.c, line 1738 net/ceph/messenger_v2.c, line 1752 net/ceph/messenger_v2.c, line 2856 net/ceph/messenger_v2.c, line 2869 net/ceph/messenger_v2.c, line 2894 net/ceph/osd_client.c, line 242 net/ceph/osd_client.c, line 306 net/sunrpc/svcsock.c, line 228 net/sunrpc/svcsock.c, line 233 net/sunrpc/svcsock.c, line 240 net/sunrpc/svcsock.c, line 256 net/sunrpc/svcsock.c, line 1117 net/sunrpc/xprtsock.c, line 372 net/sunrpc/xprtsock.c, line 389 net/sunrpc/xprtsock.c, line 394 net/sunrpc/xprtsock.c, line 402