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[PATCH] BLOCK: Make it possible to disable the block layer [try #6]

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Make it possible to disable the block layer.  Not all embedded devices require
it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
the block layer to be present.

This patch does the following:

 (*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
     support.

 (*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls
     an item that uses the block layer.  This includes:

     (*) Block I/O tracing.

     (*) Disk partition code.

     (*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.

     (*) The SCSI layer.  As far as I can tell, even SCSI chardevs use the
     	 block layer to do scheduling.  Some drivers that use SCSI facilities -
     	 such as USB storage - end up disabled indirectly from this.

     (*) Various block-based device drivers, such as IDE and the old CDROM
     	 drivers.

     (*) MTD blockdev handling and FTL.

     (*) JFFS - which uses set_bdev_super(), something it could avoid doing by
     	 taking a leaf out of JFFS2's book.

 (*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and
     linux/elevator.h contingent on CONFIG_BLOCK being set.  sector_div() is,
     however, still used in places, and so is still available.

 (*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and
     parts of linux/fs.h.

 (*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.

 (*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.

 (*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
     is not enabled.

 (*) fs/no-block.c is created to hold out-of-line stubs and things that are
     required when CONFIG_BLOCK is not set:

     (*) Default blockdev file operations (to give error ENODEV on opening).

 (*) Makes some /proc changes:

     (*) /proc/devices does not list any blockdevs.

     (*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.

 (*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.

 (*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if
     given command other than Q_SYNC or if a special device is specified.

 (*) In init/do_mounts.c, no reference is made to the blockdev routines if
     CONFIG_BLOCK is not defined.  This does not prohibit NFS roots or JFFS2.

 (*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return
     error ENOSYS by way of cond_syscall if so).

 (*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if
     CONFIG_BLOCK is not set, since they can't then happen.

Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
David Howells 2006-09-30 20:45:40 +02:00 committed by Jens Axboe
parent d366e40a1c
commit 9361401eb7
44 changed files with 308 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
block/Kconfig
View File

@ -1,6 +1,24 @@
#
# Block layer core configuration
#
config BLOCK
bool "Enable the block layer"
default y
help
This permits the block layer to be removed from the kernel if it's not
needed (on some embedded devices for example). If this option is
disabled, then blockdev files will become unusable and some
filesystems (such as ext3) will become unavailable.
This option will also disable SCSI character devices and USB storage
since they make use of various block layer definitions and
facilities.
Say Y here unless you know you really don't want to mount disks and
suchlike.
if BLOCK
#XXX - it makes sense to enable this only for 32-bit subarch's, not for x86_64
#for instance.
config LBD
@ -33,4 +51,6 @@ config LSF
If unsure, say Y.
endif
source block/Kconfig.iosched

3
block/Kconfig.iosched
View File

@ -1,3 +1,4 @@
if BLOCK
menu "IO Schedulers"
@ -67,3 +68,5 @@ config DEFAULT_IOSCHED
default "noop" if DEFAULT_NOOP
endmenu
endif

2
block/Makefile
View File

@ -2,7 +2,7 @@
# Makefile for the kernel block layer
#
obj-y := elevator.o ll_rw_blk.o ioctl.o genhd.o scsi_ioctl.o
obj-$(CONFIG_BLOCK) := elevator.o ll_rw_blk.o ioctl.o genhd.o scsi_ioctl.o
obj-$(CONFIG_IOSCHED_NOOP) += noop-iosched.o
obj-$(CONFIG_IOSCHED_AS) += as-iosched.o

4
drivers/block/Kconfig
View File

@ -2,6 +2,8 @@
# Block device driver configuration
#
if BLOCK
menu "Block devices"
config BLK_DEV_FD
@ -468,3 +470,5 @@ config ATA_OVER_ETH
devices like the Coraid EtherDrive (R) Storage Blade.
endmenu
endif

2
drivers/cdrom/Kconfig
View File

@ -3,7 +3,7 @@
#
menu "Old CD-ROM drivers (not SCSI, not IDE)"
depends on ISA
depends on ISA && BLOCK
config CD_NO_IDESCSI
bool "Support non-SCSI/IDE/ATAPI CDROM drives"

1
drivers/char/Kconfig
View File

@ -1006,6 +1006,7 @@ config GPIO_VR41XX
config RAW_DRIVER
tristate "RAW driver (/dev/raw/rawN) (OBSOLETE)"
depends on BLOCK
help
The raw driver permits block devices to be bound to /dev/raw/rawN.
Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O.

4
drivers/char/random.c
View File

@ -655,6 +655,7 @@ void add_interrupt_randomness(int irq)
add_timer_randomness(irq_timer_state[irq], 0x100 + irq);
}
#ifdef CONFIG_BLOCK
void add_disk_randomness(struct gendisk *disk)
{
if (!disk || !disk->random)
@ -667,6 +668,7 @@ void add_disk_randomness(struct gendisk *disk)
}
EXPORT_SYMBOL(add_disk_randomness);
#endif
#define EXTRACT_SIZE 10
@ -918,6 +920,7 @@ void rand_initialize_irq(int irq)
}
}
#ifdef CONFIG_BLOCK
void rand_initialize_disk(struct gendisk *disk)
{
struct timer_rand_state *state;
@ -932,6 +935,7 @@ void rand_initialize_disk(struct gendisk *disk)
disk->random = state;
}
}
#endif
static ssize_t
random_read(struct file * file, char __user * buf, size_t nbytes, loff_t *ppos)

4
drivers/ide/Kconfig
View File

@ -4,6 +4,8 @@
# Andre Hedrick <andre@linux-ide.org>
#
if BLOCK
menu "ATA/ATAPI/MFM/RLL support"
config IDE
@ -1082,3 +1084,5 @@ config BLK_DEV_HD
endif
endmenu
endif

3
drivers/md/Kconfig
View File

@ -2,6 +2,8 @@
# Block device driver configuration
#
if BLOCK
menu "Multi-device support (RAID and LVM)"
config MD
@ -251,3 +253,4 @@ config DM_MULTIPATH_EMC
endmenu
endif

2
drivers/message/i2o/Kconfig
View File

@ -88,7 +88,7 @@ config I2O_BUS
config I2O_BLOCK
tristate "I2O Block OSM"
depends on I2O
depends on I2O && BLOCK
---help---
Include support for the I2O Block OSM. The Block OSM presents disk
and other structured block devices to the operating system. If you

2
drivers/mmc/Kconfig
View File

@ -21,7 +21,7 @@ config MMC_DEBUG
config MMC_BLOCK
tristate "MMC block device driver"
depends on MMC
depends on MMC && BLOCK
default y
help
Say Y here to enable the MMC block device driver support.

3
drivers/mmc/Makefile
View File

@ -24,7 +24,8 @@ obj-$(CONFIG_MMC_AU1X) += au1xmmc.o
obj-$(CONFIG_MMC_OMAP) += omap.o
obj-$(CONFIG_MMC_AT91RM9200) += at91_mci.o
mmc_core-y := mmc.o mmc_queue.o mmc_sysfs.o
mmc_core-y := mmc.o mmc_sysfs.o
mmc_core-$(CONFIG_BLOCK) += mmc_queue.o
ifeq ($(CONFIG_MMC_DEBUG),y)
EXTRA_CFLAGS += -DDEBUG

12
drivers/mtd/Kconfig
View File

@ -166,7 +166,7 @@ config MTD_CHAR
config MTD_BLOCK
tristate "Caching block device access to MTD devices"
depends on MTD
depends on MTD && BLOCK
---help---
Although most flash chips have an erase size too large to be useful
as block devices, it is possible to use MTD devices which are based
@ -188,7 +188,7 @@ config MTD_BLOCK
config MTD_BLOCK_RO
tristate "Readonly block device access to MTD devices"
depends on MTD_BLOCK!=y && MTD
depends on MTD_BLOCK!=y && MTD && BLOCK
help
This allows you to mount read-only file systems (such as cramfs)
from an MTD device, without the overhead (and danger) of the caching
@ -199,7 +199,7 @@ config MTD_BLOCK_RO
config FTL
tristate "FTL (Flash Translation Layer) support"
depends on MTD
depends on MTD && BLOCK
---help---
This provides support for the original Flash Translation Layer which
is part of the PCMCIA specification. It uses a kind of pseudo-
@ -215,7 +215,7 @@ config FTL
config NFTL
tristate "NFTL (NAND Flash Translation Layer) support"
depends on MTD
depends on MTD && BLOCK
---help---
This provides support for the NAND Flash Translation Layer which is
used on M-Systems' DiskOnChip devices. It uses a kind of pseudo-
@ -238,7 +238,7 @@ config NFTL_RW
config INFTL
tristate "INFTL (Inverse NAND Flash Translation Layer) support"
depends on MTD
depends on MTD && BLOCK
---help---
This provides support for the Inverse NAND Flash Translation
Layer which is used on M-Systems' newer DiskOnChip devices. It
@ -255,7 +255,7 @@ config INFTL
config RFD_FTL
tristate "Resident Flash Disk (Flash Translation Layer) support"
depends on MTD
depends on MTD && BLOCK
---help---
This provides support for the flash translation layer known
as the Resident Flash Disk (RFD), as used by the Embedded BIOS

2
drivers/mtd/devices/Kconfig
View File

@ -136,7 +136,7 @@ config MTDRAM_ABS_POS
config MTD_BLOCK2MTD
tristate "MTD using block device"
depends on MTD
depends on MTD && BLOCK
help
This driver allows a block device to appear as an MTD. It would
generally be used in the following cases:

2
drivers/s390/block/Kconfig
View File

@ -1,4 +1,4 @@
if S390
if S390 && BLOCK
comment "S/390 block device drivers"
depends on S390

2
drivers/scsi/Kconfig
View File

@ -3,11 +3,13 @@ menu "SCSI device support"
config RAID_ATTRS
tristate "RAID Transport Class"
default n
depends on BLOCK
---help---
Provides RAID
config SCSI
tristate "SCSI device support"
depends on BLOCK
---help---
If you want to use a SCSI hard disk, SCSI tape drive, SCSI CD-ROM or
any other SCSI device under Linux, say Y and make sure that you know

31
fs/Kconfig
View File

@ -4,6 +4,8 @@
menu "File systems"
if BLOCK
config EXT2_FS
tristate "Second extended fs support"
help
@ -399,6 +401,8 @@ config ROMFS_FS
If you don't know whether you need it, then you don't need it:
answer N.
endif
config INOTIFY
bool "Inotify file change notification support"
default y
@ -530,6 +534,7 @@ config FUSE_FS
If you want to develop a userspace FS, or if you want to use
a filesystem based on FUSE, answer Y or M.
if BLOCK
menu "CD-ROM/DVD Filesystems"
config ISO9660_FS
@ -597,7 +602,9 @@ config UDF_NLS
depends on (UDF_FS=m && NLS) || (UDF_FS=y && NLS=y)
endmenu
endif
if BLOCK
menu "DOS/FAT/NT Filesystems"
config FAT_FS
@ -782,6 +789,7 @@ config NTFS_RW
It is perfectly safe to say N here.
endmenu
endif
menu "Pseudo filesystems"
@ -939,7 +947,7 @@ menu "Miscellaneous filesystems"
config ADFS_FS
tristate "ADFS file system support (EXPERIMENTAL)"
depends on EXPERIMENTAL
depends on BLOCK && EXPERIMENTAL
help
The Acorn Disc Filing System is the standard file system of the
RiscOS operating system which runs on Acorn's ARM-based Risc PC
@ -967,7 +975,7 @@ config ADFS_FS_RW
config AFFS_FS
tristate "Amiga FFS file system support (EXPERIMENTAL)"
depends on EXPERIMENTAL
depends on BLOCK && EXPERIMENTAL
help
The Fast File System (FFS) is the common file system used on hard
disks by Amiga(tm) systems since AmigaOS Version 1.3 (34.20). Say Y
@ -989,7 +997,7 @@ config AFFS_FS
config HFS_FS
tristate "Apple Macintosh file system support (EXPERIMENTAL)"
depends on EXPERIMENTAL
depends on BLOCK && EXPERIMENTAL
select NLS
help
If you say Y here, you will be able to mount Macintosh-formatted
@ -1002,6 +1010,7 @@ config HFS_FS
config HFSPLUS_FS
tristate "Apple Extended HFS file system support"
depends on BLOCK
select NLS
select NLS_UTF8
help
@ -1015,7 +1024,7 @@ config HFSPLUS_FS
config BEFS_FS
tristate "BeOS file system (BeFS) support (read only) (EXPERIMENTAL)"
depends on EXPERIMENTAL
depends on BLOCK && EXPERIMENTAL
select NLS
help
The BeOS File System (BeFS) is the native file system of Be, Inc's
@ -1042,7 +1051,7 @@ config BEFS_DEBUG
config BFS_FS
tristate "BFS file system support (EXPERIMENTAL)"
depends on EXPERIMENTAL
depends on BLOCK && EXPERIMENTAL
help
Boot File System (BFS) is a file system used under SCO UnixWare to
allow the bootloader access to the kernel image and other important
@ -1064,7 +1073,7 @@ config BFS_FS
config EFS_FS
tristate "EFS file system support (read only) (EXPERIMENTAL)"
depends on EXPERIMENTAL
depends on BLOCK && EXPERIMENTAL
help
EFS is an older file system used for non-ISO9660 CD-ROMs and hard
disk partitions by SGI's IRIX operating system (IRIX 6.0 and newer
@ -1079,7 +1088,7 @@ config EFS_FS
config JFFS_FS
tristate "Journalling Flash File System (JFFS) support"
depends on MTD
depends on MTD && BLOCK
help
JFFS is the Journaling Flash File System developed by Axis
Communications in Sweden, aimed at providing a crash/powerdown-safe
@ -1264,6 +1273,7 @@ endchoice
config CRAMFS
tristate "Compressed ROM file system support (cramfs)"
depends on BLOCK
select ZLIB_INFLATE
help
Saying Y here includes support for CramFs (Compressed ROM File
@ -1283,6 +1293,7 @@ config CRAMFS
config VXFS_FS
tristate "FreeVxFS file system support (VERITAS VxFS(TM) compatible)"
depends on BLOCK
help
FreeVxFS is a file system driver that support the VERITAS VxFS(TM)
file system format. VERITAS VxFS(TM) is the standard file system
@ -1300,6 +1311,7 @@ config VXFS_FS
config HPFS_FS
tristate "OS/2 HPFS file system support"
depends on BLOCK
help
OS/2 is IBM's operating system for PC's, the same as Warp, and HPFS
is the file system used for organizing files on OS/2 hard disk
@ -1316,6 +1328,7 @@ config HPFS_FS
config QNX4FS_FS
tristate "QNX4 file system support (read only)"
depends on BLOCK
help
This is the file system used by the real-time operating systems
QNX 4 and QNX 6 (the latter is also called QNX RTP).
@ -1343,6 +1356,7 @@ config QNX4FS_RW
config SYSV_FS
tristate "System V/Xenix/V7/Coherent file system support"
depends on BLOCK
help
SCO, Xenix and Coherent are commercial Unix systems for Intel
machines, and Version 7 was used on the DEC PDP-11. Saying Y
@ -1381,6 +1395,7 @@ config SYSV_FS
config UFS_FS
tristate "UFS file system support (read only)"
depends on BLOCK
help
BSD and derivate versions of Unix (such as SunOS, FreeBSD, NetBSD,
OpenBSD and NeXTstep) use a file system called UFS. Some System V
@ -1959,11 +1974,13 @@ config GENERIC_ACL
endmenu
if BLOCK
menu "Partition Types"
source "fs/partitions/Kconfig"
endmenu
endif
source "fs/nls/Kconfig"

14
fs/Makefile
View File

@ -5,12 +5,18 @@
# Rewritten to use lists instead of if-statements.
#
obj-y := open.o read_write.o file_table.o buffer.o bio.o super.o \
block_dev.o char_dev.o stat.o exec.o pipe.o namei.o fcntl.o \
obj-y := open.o read_write.o file_table.o super.o \
char_dev.o stat.o exec.o pipe.o namei.o fcntl.o \
ioctl.o readdir.o select.o fifo.o locks.o dcache.o inode.o \
attr.o bad_inode.o file.o filesystems.o namespace.o aio.o \
seq_file.o xattr.o libfs.o fs-writeback.o mpage.o direct-io.o \
ioprio.o pnode.o drop_caches.o splice.o sync.o
seq_file.o xattr.o libfs.o fs-writeback.o \
pnode.o drop_caches.o splice.o sync.o
ifeq ($(CONFIG_BLOCK),y)
obj-y += buffer.o bio.o block_dev.o direct-io.o mpage.o ioprio.o
else
obj-y += no-block.o
endif
obj-$(CONFIG_INOTIFY) += inotify.o
obj-$(CONFIG_INOTIFY_USER) += inotify_user.o

18
fs/compat_ioctl.c
View File

@ -645,6 +645,7 @@ out:
}
#endif
#ifdef CONFIG_BLOCK
struct hd_geometry32 {
unsigned char heads;
unsigned char sectors;
@ -869,6 +870,7 @@ static int sg_grt_trans(unsigned int fd, unsigned int cmd, unsigned long arg)
}
return err;
}
#endif /* CONFIG_BLOCK */
struct sock_fprog32 {
unsigned short len;
@ -992,6 +994,7 @@ static int ppp_ioctl_trans(unsigned int fd, unsigned int cmd, unsigned long arg)
}
#ifdef CONFIG_BLOCK
struct mtget32 {
compat_long_t mt_type;
compat_long_t mt_resid;
@ -1164,6 +1167,7 @@ static int cdrom_ioctl_trans(unsigned int fd, unsigned int cmd, unsigned long ar
return err;
}
#endif /* CONFIG_BLOCK */
#ifdef CONFIG_VT
@ -1491,6 +1495,7 @@ ret_einval(unsigned int fd, unsigned int cmd, unsigned long arg)
return -EINVAL;
}
#ifdef CONFIG_BLOCK
static int broken_blkgetsize(unsigned int fd, unsigned int cmd, unsigned long arg)
{
/* The mkswap binary hard codes it to Intel value :-((( */
@ -1525,12 +1530,14 @@ static int blkpg_ioctl_trans(unsigned int fd, unsigned int cmd, unsigned long ar
return sys_ioctl(fd, cmd, (unsigned long)a);
}
#endif
static int ioc_settimeout(unsigned int fd, unsigned int cmd, unsigned long arg)
{
return rw_long(fd, AUTOFS_IOC_SETTIMEOUT, arg);
}
#ifdef CONFIG_BLOCK
/* Fix sizeof(sizeof()) breakage */
#define BLKBSZGET_32 _IOR(0x12,112,int)
#define BLKBSZSET_32 _IOW(0x12,113,int)
@ -1551,6 +1558,7 @@ static int do_blkgetsize64(unsigned int fd, unsigned int cmd,
{
return sys_ioctl(fd, BLKGETSIZE64, (unsigned long)compat_ptr(arg));
}
#endif
/* Bluetooth ioctls */
#define HCIUARTSETPROTO _IOW('U', 200, int)
@ -1571,6 +1579,7 @@ static int do_blkgetsize64(unsigned int fd, unsigned int cmd,
#define HIDPGETCONNLIST _IOR('H', 210, int)
#define HIDPGETCONNINFO _IOR('H', 211, int)
#ifdef CONFIG_BLOCK
struct floppy_struct32 {
compat_uint_t size;
compat_uint_t sect;
@ -1895,6 +1904,7 @@ out:
kfree(karg);
return err;
}
#endif
struct mtd_oob_buf32 {
u_int32_t start;
@ -1936,6 +1946,7 @@ static int mtd_rw_oob(unsigned int fd, unsigned int cmd, unsigned long arg)
return err;
}
#ifdef CONFIG_BLOCK
struct raw32_config_request
{
compat_int_t raw_minor;
@ -2000,6 +2011,7 @@ static int raw_ioctl(unsigned fd, unsigned cmd, unsigned long arg)
}
return ret;
}
#endif /* CONFIG_BLOCK */
struct serial_struct32 {
compat_int_t type;
@ -2606,6 +2618,7 @@ HANDLE_IOCTL(SIOCBRDELIF, dev_ifsioc)
HANDLE_IOCTL(SIOCRTMSG, ret_einval)
HANDLE_IOCTL(SIOCGSTAMP, do_siocgstamp)
#endif
#ifdef CONFIG_BLOCK
HANDLE_IOCTL(HDIO_GETGEO, hdio_getgeo)
HANDLE_IOCTL(BLKRAGET, w_long)
HANDLE_IOCTL(BLKGETSIZE, w_long)
@ -2631,14 +2644,17 @@ HANDLE_IOCTL(FDGETFDCSTAT32, fd_ioctl_trans)
HANDLE_IOCTL(FDWERRORGET32, fd_ioctl_trans)
HANDLE_IOCTL(SG_IO,sg_ioctl_trans)
HANDLE_IOCTL(SG_GET_REQUEST_TABLE, sg_grt_trans)
#endif
HANDLE_IOCTL(PPPIOCGIDLE32, ppp_ioctl_trans)
HANDLE_IOCTL(PPPIOCSCOMPRESS32, ppp_ioctl_trans)
HANDLE_IOCTL(PPPIOCSPASS32, ppp_sock_fprog_ioctl_trans)
HANDLE_IOCTL(PPPIOCSACTIVE32, ppp_sock_fprog_ioctl_trans)
#ifdef CONFIG_BLOCK
HANDLE_IOCTL(MTIOCGET32, mt_ioctl_trans)
HANDLE_IOCTL(MTIOCPOS32, mt_ioctl_trans)
HANDLE_IOCTL(CDROMREADAUDIO, cdrom_ioctl_trans)
HANDLE_IOCTL(CDROM_SEND_PACKET, cdrom_ioctl_trans)
#endif
#define AUTOFS_IOC_SETTIMEOUT32 _IOWR(0x93,0x64,unsigned int)
HANDLE_IOCTL(AUTOFS_IOC_SETTIMEOUT32, ioc_settimeout)
#ifdef CONFIG_VT
@ -2677,12 +2693,14 @@ HANDLE_IOCTL(SONET_SETFRAMING, do_atm_ioctl)
HANDLE_IOCTL(SONET_GETFRAMING, do_atm_ioctl)
HANDLE_IOCTL(SONET_GETFRSENSE, do_atm_ioctl)
/* block stuff */
#ifdef CONFIG_BLOCK
HANDLE_IOCTL(BLKBSZGET_32, do_blkbszget)
HANDLE_IOCTL(BLKBSZSET_32, do_blkbszset)
HANDLE_IOCTL(BLKGETSIZE64_32, do_blkgetsize64)
/* Raw devices */
HANDLE_IOCTL(RAW_SETBIND, raw_ioctl)
HANDLE_IOCTL(RAW_GETBIND, raw_ioctl)
#endif
/* Serial */
HANDLE_IOCTL(TIOCGSERIAL, serial_struct_ioctl)
HANDLE_IOCTL(TIOCSSERIAL, serial_struct_ioctl)

6
fs/internal.h
View File

@ -14,10 +14,16 @@
/*
* block_dev.c
*/
#ifdef CONFIG_BLOCK
extern struct super_block *blockdev_superblock;
extern void __init bdev_cache_init(void);
#define sb_is_blkdev_sb(sb) ((sb) == blockdev_superblock)
#else
static inline void bdev_cache_init(void) {}
#define sb_is_blkdev_sb(sb) 0
#endif
/*
* char_dev.c

22
fs/no-block.c Normal file
View File

@ -0,0 +1,22 @@
/* no-block.c: implementation of routines required for non-BLOCK configuration
*
* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/fs.h>
static int no_blkdev_open(struct inode * inode, struct file * filp)
{
return -ENODEV;
}
const struct file_operations def_blk_fops = {
.open = no_blkdev_open,
};

2
fs/partitions/Makefile
View File

@ -2,7 +2,7 @@
# Makefile for the linux kernel.
#
obj-y := check.o
obj-$(CONFIG_BLOCK) := check.o
obj-$(CONFIG_ACORN_PARTITION) += acorn.o
obj-$(CONFIG_AMIGA_PARTITION) += amiga.o

11
fs/proc/proc_misc.c
View File

@ -277,12 +277,15 @@ static int devinfo_show(struct seq_file *f, void *v)
if (i == 0)
seq_printf(f, "Character devices:\n");
chrdev_show(f, i);
} else {
}
#ifdef CONFIG_BLOCK
else {
i -= CHRDEV_MAJOR_HASH_SIZE;
if (i == 0)
seq_printf(f, "\nBlock devices:\n");
blkdev_show(f, i);
}
#endif
return 0;
}
@ -355,6 +358,7 @@ static int stram_read_proc(char *page, char **start, off_t off,
}
#endif
#ifdef CONFIG_BLOCK
extern struct seq_operations partitions_op;
static int partitions_open(struct inode *inode, struct file *file)
{
@ -378,6 +382,7 @@ static struct file_operations proc_diskstats_operations = {
.llseek = seq_lseek,
.release = seq_release,
};
#endif
#ifdef CONFIG_MODULES
extern struct seq_operations modules_op;
@ -695,7 +700,9 @@ void __init proc_misc_init(void)
entry->proc_fops = &proc_kmsg_operations;
create_seq_entry("devices", 0, &proc_devinfo_operations);
create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
#ifdef CONFIG_BLOCK
create_seq_entry("partitions", 0, &proc_partitions_operations);
#endif
create_seq_entry("stat", 0, &proc_stat_operations);
create_seq_entry("interrupts", 0, &proc_interrupts_operations);
#ifdef CONFIG_SLAB
@ -707,7 +714,9 @@ void __init proc_misc_init(void)
create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
#ifdef CONFIG_BLOCK
create_seq_entry("diskstats", 0, &proc_diskstats_operations);
#endif
#ifdef CONFIG_MODULES
create_seq_entry("modules", 0, &proc_modules_operations);
#endif

44
fs/quota.c
View File

@ -337,6 +337,34 @@ static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, void
return 0;
}
/*
* look up a superblock on which quota ops will be performed
* - use the name of a block device to find the superblock thereon
*/
static inline struct super_block *quotactl_block(const char __user *special)
{
#ifdef CONFIG_BLOCK
struct block_device *bdev;
struct super_block *sb;
char *tmp = getname(special);
if (IS_ERR(tmp))
return ERR_PTR(PTR_ERR(tmp));
bdev = lookup_bdev(tmp);
putname(tmp);
if (IS_ERR(bdev))
return ERR_PTR(PTR_ERR(bdev));
sb = get_super(bdev);
bdput(bdev);
if (!sb)
return ERR_PTR(-ENODEV);
return sb;
#else
return ERR_PTR(-ENODEV);
#endif
}
/*
* This is the system call interface. This communicates with
* the user-level programs. Currently this only supports diskquota
@ -347,25 +375,15 @@ asmlinkage long sys_quotactl(unsigned int cmd, const char __user *special, qid_t
{
uint cmds, type;
struct super_block *sb = NULL;
struct block_device *bdev;
char *tmp;
int ret;
cmds = cmd >> SUBCMDSHIFT;
type = cmd & SUBCMDMASK;
if (cmds != Q_SYNC || special) {
tmp = getname(special);
if (IS_ERR(tmp))
return PTR_ERR(tmp);
bdev = lookup_bdev(tmp);
putname(tmp);
if (IS_ERR(bdev))
return PTR_ERR(bdev);
sb = get_super(bdev);
bdput(bdev);
if (!sb)
return -ENODEV;
sb = quotactl_block(special);
if (IS_ERR(sb))
return PTR_ERR(sb);
}
ret = check_quotactl_valid(sb, type, cmds, id);

4
fs/super.c
View File

@ -571,8 +571,10 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
{
int retval;
#ifdef CONFIG_BLOCK
if (!(flags & MS_RDONLY) && bdev_read_only(sb->s_bdev))
return -EACCES;
#endif
if (flags & MS_RDONLY)
acct_auto_close(sb);
shrink_dcache_sb(sb);
@ -692,6 +694,7 @@ void kill_litter_super(struct super_block *sb)
EXPORT_SYMBOL(kill_litter_super);
#ifdef CONFIG_BLOCK
static int set_bdev_super(struct super_block *s, void *data)
{
s->s_bdev = data;
@ -787,6 +790,7 @@ void kill_block_super(struct super_block *sb)
}
EXPORT_SYMBOL(kill_block_super);
#endif
int get_sb_nodev(struct file_system_type *fs_type,
int flags, void *data,

1
fs/xfs/Kconfig
View File

@ -1,5 +1,6 @@
config XFS_FS
tristate "XFS filesystem support"
depends on BLOCK
help
XFS is a high performance journaling filesystem which originated
on the SGI IRIX platform. It is completely multi-threaded, can

50
include/linux/blkdev.h
View File

@ -16,6 +16,22 @@
#include <asm/scatterlist.h>
#ifdef CONFIG_LBD
# include <asm/div64.h>
# define sector_div(a, b) do_div(a, b)
#else
# define sector_div(n, b)( \
{ \
int _res; \
_res = (n) % (b); \
(n) /= (b); \
_res; \
} \
)
#endif
#ifdef CONFIG_BLOCK
struct scsi_ioctl_command;
struct request_queue;
@ -818,24 +834,30 @@ struct work_struct;
int kblockd_schedule_work(struct work_struct *work);
void kblockd_flush(void);
#ifdef CONFIG_LBD
# include <asm/div64.h>
# define sector_div(a, b) do_div(a, b)
#else
# define sector_div(n, b)( \
{ \
int _res; \
_res = (n) % (b); \
(n) /= (b); \
_res; \
} \
)
#endif
#define MODULE_ALIAS_BLOCKDEV(major,minor) \
MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
MODULE_ALIAS("block-major-" __stringify(major) "-*")
#else /* CONFIG_BLOCK */
/*
* stubs for when the block layer is configured out
*/
#define buffer_heads_over_limit 0
static inline long blk_congestion_wait(int rw, long timeout)
{
return timeout;
}
static inline long nr_blockdev_pages(void)
{
return 0;
}
static inline void exit_io_context(void) {}
#endif /* CONFIG_BLOCK */
#endif

16
include/linux/buffer_head.h
View File

@ -14,6 +14,8 @@
#include <linux/wait.h>
#include <asm/atomic.h>
#ifdef CONFIG_BLOCK
enum bh_state_bits {
BH_Uptodate, /* Contains valid data */
BH_Dirty, /* Is dirty */
@ -301,4 +303,18 @@ static inline void lock_buffer(struct buffer_head *bh)
}
extern int __set_page_dirty_buffers(struct page *page);
#else /* CONFIG_BLOCK */
static inline void buffer_init(void) {}
static inline int try_to_free_buffers(struct page *page) { return 1; }
static inline int sync_blockdev(struct block_device *bdev) { return 0; }
static inline int inode_has_buffers(struct inode *inode) { return 0; }
static inline void invalidate_inode_buffers(struct inode *inode) {}
static inline int remove_inode_buffers(struct inode *inode) { return 1; }
static inline int sync_mapping_buffers(struct address_space *mapping) { return 0; }
static inline void invalidate_bdev(struct block_device *bdev, int destroy_dirty_buffers) {}
#endif /* CONFIG_BLOCK */
#endif /* _LINUX_BUFFER_HEAD_H */

2
include/linux/compat_ioctl.h
View File

@ -90,6 +90,7 @@ COMPATIBLE_IOCTL(FDTWADDLE)
COMPATIBLE_IOCTL(FDFMTTRK)
COMPATIBLE_IOCTL(FDRAWCMD)
/* 0x12 */
#ifdef CONFIG_BLOCK
COMPATIBLE_IOCTL(BLKRASET)
COMPATIBLE_IOCTL(BLKROSET)
COMPATIBLE_IOCTL(BLKROGET)
@ -103,6 +104,7 @@ COMPATIBLE_IOCTL(BLKTRACESETUP)
COMPATIBLE_IOCTL(BLKTRACETEARDOWN)
ULONG_IOCTL(BLKRASET)
ULONG_IOCTL(BLKFRASET)
#endif
/* RAID */
COMPATIBLE_IOCTL(RAID_VERSION)
COMPATIBLE_IOCTL(GET_ARRAY_INFO)

3
include/linux/elevator.h
View File

@ -3,6 +3,8 @@
#include <linux/percpu.h>
#ifdef CONFIG_BLOCK
typedef int (elevator_merge_fn) (request_queue_t *, struct request **,
struct bio *);
@ -203,4 +205,5 @@ enum {
__val; \
})
#endif /* CONFIG_BLOCK */
#endif

25
include/linux/fs.h
View File

@ -1482,6 +1482,7 @@ extern void __init vfs_caches_init(unsigned long);
extern void putname(const char *name);
#endif
#ifdef CONFIG_BLOCK
extern int register_blkdev(unsigned int, const char *);
extern int unregister_blkdev(unsigned int, const char *);
extern struct block_device *bdget(dev_t);
@ -1490,11 +1491,15 @@ extern void bd_forget(struct inode *inode);
extern void bdput(struct block_device *);
extern struct block_device *open_by_devnum(dev_t, unsigned);
extern struct block_device *open_partition_by_devnum(dev_t, unsigned);
extern const struct file_operations def_blk_fops;
extern const struct address_space_operations def_blk_aops;
#else
static inline void bd_forget(struct inode *inode) {}
#endif
extern const struct file_operations def_blk_fops;
extern const struct file_operations def_chr_fops;
extern const struct file_operations bad_sock_fops;
extern const struct file_operations def_fifo_fops;
#ifdef CONFIG_BLOCK
extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
@ -1510,6 +1515,7 @@ extern void bd_release_from_disk(struct block_device *, struct gendisk *);
#define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
#define bd_release_from_disk(bdev, disk) bd_release(bdev)
#endif
#endif
/* fs/char_dev.c */
#define CHRDEV_MAJOR_HASH_SIZE 255
@ -1523,14 +1529,19 @@ extern int chrdev_open(struct inode *, struct file *);
extern void chrdev_show(struct seq_file *,off_t);
/* fs/block_dev.c */
#define BLKDEV_MAJOR_HASH_SIZE 255
#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
#ifdef CONFIG_BLOCK
#define BLKDEV_MAJOR_HASH_SIZE 255
extern const char *__bdevname(dev_t, char *buffer);
extern const char *bdevname(struct block_device *bdev, char *buffer);
extern struct block_device *lookup_bdev(const char *);
extern struct block_device *open_bdev_excl(const char *, int, void *);
extern void close_bdev_excl(struct block_device *);
extern void blkdev_show(struct seq_file *,off_t);
#else
#define BLKDEV_MAJOR_HASH_SIZE 0
#endif
extern void init_special_inode(struct inode *, umode_t, dev_t);
@ -1544,6 +1555,7 @@ extern const struct file_operations rdwr_fifo_fops;
extern int fs_may_remount_ro(struct super_block *);
#ifdef CONFIG_BLOCK
/*
* return READ, READA, or WRITE
*/
@ -1555,9 +1567,10 @@ extern int fs_may_remount_ro(struct super_block *);
#define bio_data_dir(bio) ((bio)->bi_rw & 1)
extern int check_disk_change(struct block_device *);
extern int invalidate_inodes(struct super_block *);
extern int __invalidate_device(struct block_device *);
extern int invalidate_partition(struct gendisk *, int);
#endif
extern int invalidate_inodes(struct super_block *);
unsigned long invalidate_mapping_pages(struct address_space *mapping,
pgoff_t start, pgoff_t end);
unsigned long invalidate_inode_pages(struct address_space *mapping);
@ -1590,7 +1603,9 @@ extern void emergency_sync(void);
extern void emergency_remount(void);
extern int do_remount_sb(struct super_block *sb, int flags,
void *data, int force);
#ifdef CONFIG_BLOCK
extern sector_t bmap(struct inode *, sector_t);
#endif
extern int notify_change(struct dentry *, struct iattr *);
extern int permission(struct inode *, int, struct nameidata *);
extern int generic_permission(struct inode *, int,
@ -1673,9 +1688,11 @@ static inline void insert_inode_hash(struct inode *inode) {
extern struct file * get_empty_filp(void);
extern void file_move(struct file *f, struct list_head *list);
extern void file_kill(struct file *f);
#ifdef CONFIG_BLOCK
struct bio;
extern void submit_bio(int, struct bio *);
extern int bdev_read_only(struct block_device *);
#endif
extern int set_blocksize(struct block_device *, int);
extern int sb_set_blocksize(struct super_block *, int);
extern int sb_min_blocksize(struct super_block *, int);
@ -1756,6 +1773,7 @@ static inline void do_generic_file_read(struct file * filp, loff_t *ppos,
actor);
}
#ifdef CONFIG_BLOCK
ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
struct block_device *bdev, const struct iovec *iov, loff_t offset,
unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
@ -1793,6 +1811,7 @@ static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb,
return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
nr_segs, get_block, end_io, DIO_OWN_LOCKING);
}
#endif
extern const struct file_operations generic_ro_fops;

4
include/linux/genhd.h
View File

@ -11,6 +11,8 @@
#include <linux/types.h>
#ifdef CONFIG_BLOCK
enum {
/* These three have identical behaviour; use the second one if DOS FDISK gets
confused about extended/logical partitions starting past cylinder 1023. */
@ -420,3 +422,5 @@ static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
#endif
#endif
#endif

3
include/linux/mpage.h
View File

@ -9,6 +9,7 @@
* (And no, it doesn't do the #ifdef __MPAGE_H thing, and it doesn't do
* nested includes. Get it right in the .c file).
*/
#ifdef CONFIG_BLOCK
struct writeback_control;
typedef int (writepage_t)(struct page *page, struct writeback_control *wbc);
@ -20,3 +21,5 @@ int mpage_writepages(struct address_space *mapping,
struct writeback_control *wbc, get_block_t get_block);
int mpage_writepage(struct page *page, get_block_t *get_block,
struct writeback_control *wbc);
#endif

3
include/linux/raid/md.h
View File

@ -53,6 +53,8 @@
#include <linux/raid/md_u.h>
#include <linux/raid/md_k.h>
#ifdef CONFIG_MD
/*
* Different major versions are not compatible.
* Different minor versions are only downward compatible.
@ -95,5 +97,6 @@ extern void md_new_event(mddev_t *mddev);
extern void md_update_sb(mddev_t * mddev);
#endif /* CONFIG_MD */
#endif

3
include/linux/raid/md_k.h
View File

@ -18,6 +18,8 @@
/* and dm-bio-list.h is not under include/linux because.... ??? */
#include "../../../drivers/md/dm-bio-list.h"
#ifdef CONFIG_BLOCK
#define LEVEL_MULTIPATH (-4)
#define LEVEL_LINEAR (-1)
#define LEVEL_FAULTY (-5)
@ -362,5 +364,6 @@ static inline void safe_put_page(struct page *p)
if (p) put_page(p);
}
#endif /* CONFIG_BLOCK */
#endif

3
include/scsi/scsi_tcq.h
View File

@ -6,7 +6,6 @@
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#define MSG_SIMPLE_TAG 0x20
#define MSG_HEAD_TAG 0x21
#define MSG_ORDERED_TAG 0x22
@ -14,6 +13,7 @@
#define SCSI_NO_TAG (-1) /* identify no tag in use */
#ifdef CONFIG_BLOCK
/**
* scsi_get_tag_type - get the type of tag the device supports
@ -144,4 +144,5 @@ static inline int scsi_init_shared_tag_map(struct Scsi_Host *shost, int depth)
return shost->bqt ? 0 : -ENOMEM;
}
#endif /* CONFIG_BLOCK */
#endif /* _SCSI_SCSI_TCQ_H */

2
init/Kconfig
View File

@ -92,7 +92,7 @@ config LOCALVERSION_AUTO
config SWAP
bool "Support for paging of anonymous memory (swap)"
depends on MMU
depends on MMU && BLOCK
default y
help
This option allows you to choose whether you want to have support

13
init/do_mounts.c
View File

@ -285,7 +285,11 @@ void __init mount_block_root(char *name, int flags)
{
char *fs_names = __getname();
char *p;
#ifdef CONFIG_BLOCK
char b[BDEVNAME_SIZE];
#else
const char *b = name;
#endif
get_fs_names(fs_names);
retry:
@ -304,7 +308,9 @@ retry:
* Allow the user to distinguish between failed sys_open
* and bad superblock on root device.
*/
#ifdef CONFIG_BLOCK
__bdevname(ROOT_DEV, b);
#endif
printk("VFS: Cannot open root device \"%s\" or %s\n",
root_device_name, b);
printk("Please append a correct \"root=\" boot option\n");
@ -316,7 +322,10 @@ retry:
for (p = fs_names; *p; p += strlen(p)+1)
printk(" %s", p);
printk("\n");
panic("VFS: Unable to mount root fs on %s", __bdevname(ROOT_DEV, b));
#ifdef CONFIG_BLOCK
__bdevname(ROOT_DEV, b);
#endif
panic("VFS: Unable to mount root fs on %s", b);
out:
putname(fs_names);
}
@ -387,8 +396,10 @@ void __init mount_root(void)
change_floppy("root floppy");
}
#endif
#ifdef CONFIG_BLOCK
create_dev("/dev/root", ROOT_DEV);
mount_block_root("/dev/root", root_mountflags);
#endif
}
/*

5
kernel/sys_ni.c
View File

@ -134,3 +134,8 @@ cond_syscall(sys_madvise);
cond_syscall(sys_mremap);
cond_syscall(sys_remap_file_pages);
cond_syscall(compat_sys_move_pages);
/* block-layer dependent */
cond_syscall(sys_bdflush);
cond_syscall(sys_ioprio_set);
cond_syscall(sys_ioprio_get);

2
mm/Makefile
View File

@ -12,7 +12,7 @@ obj-y := bootmem.o filemap.o mempool.o oom_kill.o fadvise.o \
readahead.o swap.o truncate.o vmscan.o \
prio_tree.o util.o mmzone.o vmstat.o $(mmu-y)
ifeq ($(CONFIG_MMU),y)
ifeq ($(CONFIG_MMU)$(CONFIG_BLOCK),yy)
obj-y += bounce.o
endif
obj-$(CONFIG_SWAP) += page_io.o swap_state.o swapfile.o thrash.o

4
mm/filemap.c
View File

@ -2020,6 +2020,7 @@ inline int generic_write_checks(struct file *file, loff_t *pos, size_t *count, i
if (unlikely(*pos + *count > inode->i_sb->s_maxbytes))
*count = inode->i_sb->s_maxbytes - *pos;
} else {
#ifdef CONFIG_BLOCK
loff_t isize;
if (bdev_read_only(I_BDEV(inode)))
return -EPERM;
@ -2031,6 +2032,9 @@ inline int generic_write_checks(struct file *file, loff_t *pos, size_t *count, i
if (*pos + *count > isize)
*count = isize - *pos;
#else
return -EPERM;
#endif
}
return 0;
}

2
mm/migrate.c
View File

@ -409,6 +409,7 @@ int migrate_page(struct address_space *mapping,
}
EXPORT_SYMBOL(migrate_page);
#ifdef CONFIG_BLOCK
/*
* Migration function for pages with buffers. This function can only be used
* if the underlying filesystem guarantees that no other references to "page"
@ -466,6 +467,7 @@ int buffer_migrate_page(struct address_space *mapping,
return 0;
}
EXPORT_SYMBOL(buffer_migrate_page);
#endif
/*
* Writeback a page to clean the dirty state

8
mm/page-writeback.c
View File

@ -807,9 +807,11 @@ int fastcall set_page_dirty(struct page *page)
if (likely(mapping)) {
int (*spd)(struct page *) = mapping->a_ops->set_page_dirty;
if (spd)
return (*spd)(page);
return __set_page_dirty_buffers(page);
#ifdef CONFIG_BLOCK
if (!spd)
spd = __set_page_dirty_buffers;
#endif
return (*spd)(page);
}
if (!PageDirty(page)) {
if (!TestSetPageDirty(page))

2
mm/truncate.c
View File

@ -35,8 +35,10 @@ void do_invalidatepage(struct page *page, unsigned long offset)
{
void (*invalidatepage)(struct page *, unsigned long);
invalidatepage = page->mapping->a_ops->invalidatepage;
#ifdef CONFIG_BLOCK
if (!invalidatepage)
invalidatepage = block_invalidatepage;
#endif
if (invalidatepage)
(*invalidatepage)(page, offset);
}