Extern or forward variable declaration at include/linux/fs.h, line 48 References: block/bfq-iosched.c, line 5064 block/blk-cgroup.c, line 477 block/blk-cgroup.c, line 478 block/blk-core.c, line 400 block/blk-core.c, line 539 block/blk-core.c, line 540 block/blk-core.c, line 551 block/blk-core.c, line 593 block/blk-mq.c, line 527 block/blk-settings.c, line 171 block/blk-settings.c, line 417 block/blk-settings.c, line 419 block/blk-settings.c, line 502 block/blk-sysfs.c, line 91 block/blk-sysfs.c, line 106 block/blk-sysfs.c, line 254 block/blk-sysfs.c, line 768 block/blk-wbt.c, line 99 block/blk-wbt.c, line 236 block/blk-wbt.c, line 236 block/blk-wbt.c, line 289 block/blk-wbt.c, line 289 block/blk-wbt.c, line 361 block/genhd.c, line 546 block/genhd.c, line 548 block/genhd.c, line 610 block/genhd.c, line 610 block/genhd.c, line 719 drivers/block/drbd/drbd_req.c, line 907 drivers/block/drbd/drbd_req.c, line 912 drivers/block/pktcdvd.c, line 1187 drivers/block/pktcdvd.c, line 2333 drivers/mtd/mtdcore.c, line 37 drivers/mtd/mtdcore.c, line 2175 drivers/mtd/mtdcore.c, line 2177 fs/block_dev.c, line 1346 fs/btrfs/file.c, line 1605 fs/btrfs/file.c, line 1626 fs/btrfs/file.c, line 2031 fs/ceph/file.c, line 1697 fs/ceph/file.c, line 1851 fs/ext2/ialloc.c, line 173 fs/ext4/file.c, line 268 fs/ext4/file.c, line 270 fs/ext4/super.c, line 437 fs/fs-writeback.c, line 252 fs/fs-writeback.c, line 342 fs/fs-writeback.c, line 347 fs/fs-writeback.c, line 357 fs/fs-writeback.c, line 492 fs/fs-writeback.c, line 840 fs/fs-writeback.c, line 922 fs/fs-writeback.c, line 1024 fs/fs-writeback.c, line 1025 fs/fs-writeback.c, line 1053 fs/fs-writeback.c, line 2117 fs/fs-writeback.c, line 2129 fs/fs-writeback.c, line 2142 fs/fs-writeback.c, line 2176 fs/fs-writeback.c, line 2475 fs/fs-writeback.c, line 2553 fs/fuse/file.c, line 1295 fs/fuse/file.c, line 1341 fs/fuse/file.c, line 1627 fs/fuse/file.c, line 2048 fs/gfs2/file.c, line 935 fs/gfs2/file.c, line 937 fs/gfs2/file.c, line 956 fs/gfs2/file.c, line 958 fs/gfs2/super.c, line 501 fs/nfs/file.c, line 641 fs/nfs/file.c, line 643 fs/ntfs/file.c, line 1931 fs/ntfs/file.c, line 1935 fs/super.c, line 1547 fs/xfs/xfs_file.c, line 732 fs/xfs/xfs_file.c, line 767 include/linux/backing-dev.h, line 22 include/linux/backing-dev.h, line 22 include/linux/backing-dev.h, line 28 include/linux/backing-dev.h, line 29 include/linux/backing-dev.h, line 32 include/linux/backing-dev.h, line 34 include/linux/backing-dev.h, line 36 include/linux/backing-dev.h, line 37 include/linux/backing-dev.h, line 39 include/linux/backing-dev.h, line 58 include/linux/backing-dev.h, line 107 include/linux/backing-dev.h, line 108 include/linux/backing-dev.h, line 122 include/linux/backing-dev.h, line 136 include/linux/backing-dev.h, line 172 include/linux/backing-dev.h, line 174 include/linux/backing-dev.h, line 194 include/linux/backing-dev.h, line 210 include/linux/backing-dev.h, line 240 include/linux/backing-dev.h, line 348 include/linux/backing-dev.h, line 354 include/linux/backing-dev.h, line 411 include/linux/backing-dev.h, line 416 include/linux/backing-dev.h, line 421 include/linux/backing-dev.h, line 426 include/linux/backing-dev.h, line 432 include/linux/blk_types.h, line 48 include/linux/blkdev.h, line 413 include/linux/blkdev.h, line 413 include/linux/fs.h, line 48 include/linux/fs.h, line 1452 include/linux/swap.h, line 484 include/linux/writeback.h, line 36 include/linux/writeback.h, line 197 include/linux/writeback.h, line 339 include/trace/events/writeback.h, line 109 include/trace/events/writeback.h, line 430 include/trace/events/writeback.h, line 444 include/trace/events/writeback.h, line 493 mm/backing-dev.c, line 18 mm/backing-dev.c, line 51 mm/backing-dev.c, line 108 mm/backing-dev.c, line 116 mm/backing-dev.c, line 124 mm/backing-dev.c, line 128 mm/backing-dev.c, line 137 mm/backing-dev.c, line 154 mm/backing-dev.c, line 165 mm/backing-dev.c, line 184 mm/backing-dev.c, line 232 mm/backing-dev.c, line 279 mm/backing-dev.c, line 426 mm/backing-dev.c, line 543 mm/backing-dev.c, line 576 mm/backing-dev.c, line 594 mm/backing-dev.c, line 610 mm/backing-dev.c, line 671 mm/backing-dev.c, line 695 mm/backing-dev.c, line 700 mm/backing-dev.c, line 702 mm/backing-dev.c, line 714 mm/backing-dev.c, line 733 mm/backing-dev.c, line 735 mm/backing-dev.c, line 756 mm/backing-dev.c, line 762 mm/backing-dev.c, line 784 mm/backing-dev.c, line 786 mm/backing-dev.c, line 792 mm/backing-dev.c, line 800 mm/backing-dev.c, line 835 mm/backing-dev.c, line 847 mm/backing-dev.c, line 857 mm/backing-dev.c, line 867 mm/backing-dev.c, line 888 mm/backing-dev.c, line 889 mm/backing-dev.c, line 898 mm/backing-dev.c, line 904 mm/backing-dev.c, line 918 mm/backing-dev.c, line 932 mm/fadvise.c, line 36 mm/filemap.c, line 3656 mm/filemap.c, line 3716 mm/page-writeback.c, line 669 mm/page-writeback.c, line 690 mm/page-writeback.c, line 1573 mm/page-writeback.c, line 1880 mm/page-writeback.c, line 2011 mm/page-writeback.c, line 2011 mm/page-writeback.c, line 2012 mm/page-writeback.c, line 2014 mm/page-writeback.c, line 2022 mm/page-writeback.c, line 2034 mm/page-writeback.c, line 2733 mm/page-writeback.c, line 2775 mm/readahead.c, line 278 mm/readahead.c, line 439 mm/vmscan.c, line 737 mm/vmscan.c, line 1894 mm/vmscan.c, line 1895