docs: blockdev: add it to the admin-guide

The blockdev book basically contains user-faced documentation.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Documentation/admin-guide/blockdev/drbd/node-states-8.dot

@@ -11,4 +11,3 @@ digraph peer_states {
 	Unknown   -> Primary           [ label = "connected" ]
 	Unknown   -> Secondary         [ label = "connected" ]
 }
-

Documentation/admin-guide/blockdev/index.rst

@@ -1,5 +1,3 @@
-:orphan:
-
 ===========================
 The Linux RapidIO Subsystem
 ===========================

Documentation/admin-guide/index.rst

@@ -73,6 +73,7 @@ configure specific aspects of kernel behavior to your liking.
    java
    ras
    bcache
+   blockdev/index
    ext4
    binderfs
    pm/index

Documentation/admin-guide/kernel-parameters.txt

@@ -1249,7 +1249,7 @@
 			See also Documentation/fault-injection/.
 
 	floppy=		[HW]
-			See Documentation/blockdev/floppy.rst.
+			See Documentation/admin-guide/blockdev/floppy.rst.
 
 	force_pal_cache_flush
 			[IA-64] Avoid check_sal_cache_flush which may hang on
@@ -2234,7 +2234,7 @@
 	memblock=debug	[KNL] Enable memblock debug messages.
 
 	load_ramdisk=	[RAM] List of ramdisks to load from floppy
-			See Documentation/blockdev/ramdisk.rst.
+			See Documentation/admin-guide/blockdev/ramdisk.rst.
 
 	lockd.nlm_grace_period=P  [NFS] Assign grace period.
 			Format: <integer>
@@ -3268,7 +3268,7 @@
 
 	pcd.		[PARIDE]
 			See header of drivers/block/paride/pcd.c.
-			See also Documentation/blockdev/paride.rst.
+			See also Documentation/admin-guide/blockdev/paride.rst.
 
 	pci=option[,option...]	[PCI] various PCI subsystem options.
 
@@ -3512,7 +3512,7 @@
 			needed on a platform with proper driver support.
 
 	pd.		[PARIDE]
-			See Documentation/blockdev/paride.rst.
+			See Documentation/admin-guide/blockdev/paride.rst.
 
 	pdcchassis=	[PARISC,HW] Disable/Enable PDC Chassis Status codes at
 			boot time.
@@ -3527,10 +3527,10 @@
 			and performance comparison.
 
 	pf.		[PARIDE]
-			See Documentation/blockdev/paride.rst.
+			See Documentation/admin-guide/blockdev/paride.rst.
 
 	pg.		[PARIDE]
-			See Documentation/blockdev/paride.rst.
+			See Documentation/admin-guide/blockdev/paride.rst.
 
 	pirq=		[SMP,APIC] Manual mp-table setup
 			See Documentation/x86/i386/IO-APIC.rst.
@@ -3642,7 +3642,7 @@
 
 	prompt_ramdisk=	[RAM] List of RAM disks to prompt for floppy disk
 			before loading.
-			See Documentation/blockdev/ramdisk.rst.
+			See Documentation/admin-guide/blockdev/ramdisk.rst.
 
 	psi=		[KNL] Enable or disable pressure stall information
 			tracking.
@@ -3664,7 +3664,7 @@
 	pstore.backend=	Specify the name of the pstore backend to use
 
 	pt.		[PARIDE]
-			See Documentation/blockdev/paride.rst.
+			See Documentation/admin-guide/blockdev/paride.rst.
 
 	pti=		[X86_64] Control Page Table Isolation of user and
 			kernel address spaces.  Disabling this feature
@@ -3693,7 +3693,7 @@
 			See Documentation/admin-guide/md.rst.
 
 	ramdisk_size=	[RAM] Sizes of RAM disks in kilobytes
-			See Documentation/blockdev/ramdisk.rst.
+			See Documentation/admin-guide/blockdev/ramdisk.rst.
 
 	random.trust_cpu={on,off}
 			[KNL] Enable or disable trusting the use of the

MAINTAINERS

@@ -5006,7 +5006,7 @@ T:	git git://git.linbit.com/drbd-8.4.git
 S:	Supported
 F:	drivers/block/drbd/
 F:	lib/lru_cache.c
-F:	Documentation/blockdev/drbd/
+F:	Documentation/admin-guide/blockdev/
 
 DRIVER CORE, KOBJECTS, DEBUGFS AND SYSFS
 M:	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
@@ -11076,7 +11076,7 @@ M:	Josef Bacik <josef@toxicpanda.com>
 S:	Maintained
 L:	linux-block@vger.kernel.org
 L:	nbd@other.debian.org
-F:	Documentation/blockdev/nbd.rst
+F:	Documentation/admin-guide/blockdev/nbd.rst
 F:	drivers/block/nbd.c
 F:	include/trace/events/nbd.h
 F:	include/uapi/linux/nbd.h
@@ -12086,7 +12086,7 @@ PARIDE DRIVERS FOR PARALLEL PORT IDE DEVICES
 M:	Tim Waugh <tim@cyberelk.net>
 L:	linux-parport@lists.infradead.org (subscribers-only)
 S:	Maintained
-F:	Documentation/blockdev/paride.rst
+F:	Documentation/admin-guide/blockdev/paride.rst
 F:	drivers/block/paride/
 
 PARISC ARCHITECTURE
@@ -13367,7 +13367,7 @@ F:	drivers/net/wireless/ralink/rt2x00/
 RAMDISK RAM BLOCK DEVICE DRIVER
 M:	Jens Axboe <axboe@kernel.dk>
 S:	Maintained
-F:	Documentation/blockdev/ramdisk.rst
+F:	Documentation/admin-guide/blockdev/ramdisk.rst
 F:	drivers/block/brd.c
 
 RANCHU VIRTUAL BOARD FOR MIPS
@@ -17723,7 +17723,7 @@ R:	Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
 L:	linux-kernel@vger.kernel.org
 S:	Maintained
 F:	drivers/block/zram/
-F:	Documentation/blockdev/zram.rst
+F:	Documentation/admin-guide/blockdev/zram.rst
 
 ZS DECSTATION Z85C30 SERIAL DRIVER
 M:	"Maciej W. Rozycki" <macro@linux-mips.org>

drivers/block/Kconfig

@@ -31,7 +31,7 @@ config BLK_DEV_FD
 	  If you want to use the floppy disk drive(s) of your PC under Linux,
 	  say Y. Information about this driver, especially important for IBM
 	  Thinkpad users, is contained in
-	  <file:Documentation/blockdev/floppy.rst>.
+	  <file:Documentation/admin-guide/blockdev/floppy.rst>.
 	  That file also contains the location of the Floppy driver FAQ as
 	  well as location of the fdutils package used to configure additional
 	  parameters of the driver at run time.
@@ -96,7 +96,7 @@ config PARIDE
 	  your computer's parallel port. Most of them are actually IDE devices
 	  using a parallel port IDE adapter. This option enables the PARIDE
 	  subsystem which contains drivers for many of these external drives.
-	  Read <file:Documentation/blockdev/paride.rst> for more information.
+	  Read <file:Documentation/admin-guide/blockdev/paride.rst> for more information.
 
 	  If you have said Y to the "Parallel-port support" configuration
 	  option, you may share a single port between your printer and other
@@ -261,7 +261,7 @@ config BLK_DEV_NBD
 	  userland (making server and client physically the same computer,
 	  communicating using the loopback network device).
 
-	  Read <file:Documentation/blockdev/nbd.rst> for more information,
+	  Read <file:Documentation/admin-guide/blockdev/nbd.rst> for more information,
 	  especially about where to find the server code, which runs in user
 	  space and does not need special kernel support.
 
@@ -303,7 +303,7 @@ config BLK_DEV_RAM
 	  during the initial install of Linux.
 
 	  Note that the kernel command line option "ramdisk=XX" is now obsolete.
-	  For details, read <file:Documentation/blockdev/ramdisk.rst>.
+	  For details, read <file:Documentation/admin-guide/blockdev/ramdisk.rst>.
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called brd. An alias "rd" has been defined

drivers/block/floppy.c

@@ -4424,7 +4424,7 @@ static int __init floppy_setup(char *str)
 		pr_cont("\n");
 	} else
 		DPRINT("botched floppy option\n");
-	DPRINT("Read Documentation/blockdev/floppy.rst\n");
+	DPRINT("Read Documentation/admin-guide/blockdev/floppy.rst\n");
 	return 0;
 }
 

drivers/block/zram/Kconfig

@@ -12,7 +12,7 @@ config ZRAM
 	  It has several use cases, for example: /tmp storage, use as swap
 	  disks and maybe many more.
 
-	  See Documentation/blockdev/zram.rst for more information.
+	  See Documentation/admin-guide/blockdev/zram.rst for more information.
 
 config ZRAM_WRITEBACK
        bool "Write back incompressible or idle page to backing device"
@@ -26,7 +26,7 @@ config ZRAM_WRITEBACK
 	 With /sys/block/zramX/{idle,writeback}, application could ask
 	 idle page's writeback to the backing device to save in memory.
 
-	 See Documentation/blockdev/zram.rst for more information.
+	 See Documentation/admin-guide/blockdev/zram.rst for more information.
 
 config ZRAM_MEMORY_TRACKING
 	bool "Track zRam block status"
@@ -36,4 +36,4 @@ config ZRAM_MEMORY_TRACKING
 	  of zRAM. Admin could see the information via
 	  /sys/kernel/debug/zram/zramX/block_state.
 
-	  See Documentation/blockdev/zram.rst for more information.
+	  See Documentation/admin-guide/blockdev/zram.rst for more information.

tools/testing/selftests/zram/README

@@ -37,4 +37,4 @@ Commands required for testing:
  - mkfs/ mkfs.ext4
 
 For more information please refer:
-kernel-source-tree/Documentation/blockdev/zram.rst
+kernel-source-tree/Documentation/admin-guide/blockdev/zram.rst