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Message-ID: <32640.1156424442@warthog.cambridge.redhat.com>
Date: Thu, 24 Aug 2006 14:00:42 +0100
From: David Howells <dhowells@...hat.com>
To: Jens Axboe <axboe@...e.de>
cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] BLOCK: Make it possible to disable the block layer
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.
(*) Various block-based device drivers, such as IDE, the old CDROM
drivers and USB storage.
(*) 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.
(*) Made 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.
(*) The contents of linux/blktrace_api.h are contingent now on CONFIG_BLOCK in
addition to CONFIG_BLK_DEV_IO_TRACE, possibly unnecessarily.
(*) Also contingent are the contents of linux/mpage.h, linux/genhd.h and parts
of linux/fs.h.
(*) The contents of a number of filesystem- and blockdev-specific header files
are now contingent on their own configuration options. This includes:
Ext3/JBD, RAID, MSDOS and ReiserFS.
(*) Made a number of files in fs/ contingent on CONFIG_BLOCK.
(*) Moved some stuff out of fs/buffer.c:
(*) The file sync and general sync stuff moved to fs/sync.c.
(*) The superblock sync stuff moved to fs/super.c.
(*) do_invalidatepage() moved to mm/truncate.c.
(*) try_to_release_page() moved to mm/filemap.c.
(*) Moved some stuff between header files:
(*) declarations for do_invalidatepage() and try_to_release_page() moved
to linux/mm.h.
(*) __set_page_dirty_buffers() moved to linux/buffer_head.h.
(*) The duplicate declaration of exit_io_context() has been removed from
linux/sched.h.
(*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
is not enabled.
(*) fallback_migrate_page() uses PagePrivate() instead of page_has_buffers().
(*) The bounce buffer stuff moved from mm/highmem.c to mm/bounce.c, which is
contingent on CONFIG_BLOCK.
!!!NOTE!!! There may be a bug in this code: Should init_emergency_pool()
be contingent on CONFIG_HIGHMEM?
(*) The AFS filesystem specifies block_sync_page() as its sync_page address
op, which needs to be checked, and so is commented out.
(*) The bdev_cache_init() extern declaration was moved from fs/dcache.c to
linux/blkdev.h.
(*) The blockdev_superblock extern declaration was moved from
fs/fs-writeback.c to linux/blkdev.h.
(*) fs/fs-writeback.c no longer depends on blockdev_superblock to be present.
(*) fs/no-block.c was incorporated to hold a couple of things for when
CONFIG_BLOCK was not set:
(*) A version generic_writepages(), which is used by NFS. This is derived
from mpage_writepages() with all the BIO references removed.
(*) Default blockdev file operations (to give error ENODEV on opening).
(*) Some /proc changes:
(*) /proc/devices does not list any blockdevs.
(*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.
(*) Some compat ioctl handling is now contingent on CONFIG_BLOCK.
(*) 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 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@...hat.com>
---
block/Kconfig | 14 ++
block/Kconfig.iosched | 3
block/Makefile | 2
drivers/block/Kconfig | 4
drivers/cdrom/Kconfig | 2
drivers/char/Kconfig | 1
drivers/char/random.c | 4
drivers/ide/Kconfig | 4
drivers/ieee1394/Kconfig | 2
drivers/infiniband/ulp/iser/Kconfig | 2
drivers/infiniband/ulp/srp/Kconfig | 2
drivers/md/Kconfig | 3
drivers/message/i2o/Kconfig | 2
drivers/mmc/Kconfig | 2
drivers/mmc/Makefile | 3
drivers/mtd/Kconfig | 12 +
drivers/mtd/devices/Kconfig | 2
drivers/s390/block/Kconfig | 2
drivers/scsi/Kconfig | 8 +
drivers/usb/storage/Kconfig | 2
fs/Kconfig | 32 +++-
fs/Makefile | 14 +-
fs/afs/file.c | 2
fs/buffer.c | 174 --------------------
fs/compat_ioctl.c | 24 +++
fs/dcache.c | 2
fs/fs-writeback.c | 12 +
fs/inode.c | 6 +
fs/no-block.c | 160 +++++++++++++++++++
fs/partitions/Makefile | 2
fs/proc/proc_misc.c | 11 +
fs/quota.c | 9 +
fs/super.c | 35 ++++
fs/sync.c | 113 +++++++++++++
fs/xfs/Kconfig | 1
include/linux/blkdev.h | 53 +++++-
include/linux/blktrace_api.h | 6 +
include/linux/buffer_head.h | 19 ++
include/linux/compat_ioctl.h | 4
include/linux/elevator.h | 3
include/linux/ext3_fs.h | 3
include/linux/ext3_jbd.h | 3
include/linux/fs.h | 21 ++
include/linux/genhd.h | 4
include/linux/jbd.h | 3
include/linux/loop.h | 3
include/linux/mm.h | 4
include/linux/mpage.h | 6 +
include/linux/msdos_fs.h | 3
include/linux/raid/md.h | 3
include/linux/raid/md_k.h | 3
include/linux/reiserfs_fs.h | 3
include/linux/sched.h | 1
include/scsi/scsi_tcq.h | 3
init/Kconfig | 2
init/do_mounts.c | 13 +-
kernel/exit.c | 1
kernel/sys_ni.c | 5 +
mm/Makefile | 1
mm/bounce.c | 302 +++++++++++++++++++++++++++++++++++
mm/filemap.c | 34 ++++
mm/highmem.c | 281 ---------------------------------
mm/migrate.c | 4
mm/page-writeback.c | 9 +
mm/truncate.c | 26 +++
security/seclvl.c | 4
66 files changed, 977 insertions(+), 526 deletions(-)
diff --git a/block/Kconfig b/block/Kconfig
index b6f5f0a..9cc0d0b 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -1,6 +1,18 @@
#
# 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. 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 +45,6 @@ config LSF
If unsure, say Y.
+endif
+
source block/Kconfig.iosched
diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
index 48d090e..903f0d3 100644
--- a/block/Kconfig.iosched
+++ b/block/Kconfig.iosched
@@ -1,3 +1,4 @@
+if BLOCK
menu "IO Schedulers"
@@ -67,3 +68,5 @@ config DEFAULT_IOSCHED
default "noop" if DEFAULT_NOOP
endmenu
+
+endif
diff --git a/block/Makefile b/block/Makefile
index c05de0e..085e967 100644
--- a/block/Makefile
+++ b/block/Makefile
@@ -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
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index b5382ce..422e31d 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -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
diff --git a/drivers/cdrom/Kconfig b/drivers/cdrom/Kconfig
index ff5652d..4b12e90 100644
--- a/drivers/cdrom/Kconfig
+++ b/drivers/cdrom/Kconfig
@@ -3,7 +3,7 @@ # CDROM driver configuration
#
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"
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index c40e487..b9c6777 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -984,6 +984,7 @@ 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.
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 4c3a5ca..b430a12 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -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
}
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->random = state;
}
}
+#endif
static ssize_t
random_read(struct file * file, char __user * buf, size_t nbytes, loff_t *ppos)
diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index b6fb167..69d627b 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -4,6 +4,8 @@ #
# Andre Hedrick <andre@...ux-ide.org>
#
+if BLOCK
+
menu "ATA/ATAPI/MFM/RLL support"
config IDE
@@ -1082,3 +1084,5 @@ config BLK_DEV_HD
endif
endmenu
+
+endif
diff --git a/drivers/ieee1394/Kconfig b/drivers/ieee1394/Kconfig
index 1867375..c9d84b9 100644
--- a/drivers/ieee1394/Kconfig
+++ b/drivers/ieee1394/Kconfig
@@ -122,7 +122,7 @@ config IEEE1394_VIDEO1394
config IEEE1394_SBP2
tristate "SBP-2 support (Harddisks etc.)"
- depends on IEEE1394 && SCSI && (PCI || BROKEN)
+ depends on IEEE1394 && BLOCK && SCSI && (PCI || BROKEN)
help
This option enables you to use SBP-2 devices connected to your IEEE
1394 bus. SBP-2 devices include harddrives and DVD devices.
diff --git a/drivers/infiniband/ulp/iser/Kconfig b/drivers/infiniband/ulp/iser/Kconfig
index fead87d..f945953 100644
--- a/drivers/infiniband/ulp/iser/Kconfig
+++ b/drivers/infiniband/ulp/iser/Kconfig
@@ -1,6 +1,6 @@
config INFINIBAND_ISER
tristate "ISCSI RDMA Protocol"
- depends on INFINIBAND && SCSI
+ depends on INFINIBAND && BLOCK && SCSI
select SCSI_ISCSI_ATTRS
---help---
Support for the ISCSI RDMA Protocol over InfiniBand. This
diff --git a/drivers/infiniband/ulp/srp/Kconfig b/drivers/infiniband/ulp/srp/Kconfig
index 8fe3be4..63d7d5a 100644
--- a/drivers/infiniband/ulp/srp/Kconfig
+++ b/drivers/infiniband/ulp/srp/Kconfig
@@ -1,6 +1,6 @@
config INFINIBAND_SRP
tristate "InfiniBand SCSI RDMA Protocol"
- depends on INFINIBAND && SCSI
+ depends on INFINIBAND && BLOCK && SCSI
---help---
Support for the SCSI RDMA Protocol over InfiniBand. This
allows you to access storage devices that speak SRP over
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index bf869ed..1e91f90 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -2,6 +2,8 @@ #
# Block device driver configuration
#
+if CONFIG_BLOCK
+
menu "Multi-device support (RAID and LVM)"
config MD
@@ -251,3 +253,4 @@ config DM_MULTIPATH_EMC
endmenu
+endif
diff --git a/drivers/message/i2o/Kconfig b/drivers/message/i2o/Kconfig
index fef6771..6443392 100644
--- a/drivers/message/i2o/Kconfig
+++ b/drivers/message/i2o/Kconfig
@@ -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
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index 45bcf09..f540bd8 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -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.
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index d2957e3..b1f6e03 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -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
diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
index 1344ad7..188cd37 100644
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -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
diff --git a/drivers/mtd/devices/Kconfig b/drivers/mtd/devices/Kconfig
index 16c02b5..440f685 100644
--- a/drivers/mtd/devices/Kconfig
+++ b/drivers/mtd/devices/Kconfig
@@ -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:
diff --git a/drivers/s390/block/Kconfig b/drivers/s390/block/Kconfig
index 929d6ff..b250c53 100644
--- a/drivers/s390/block/Kconfig
+++ b/drivers/s390/block/Kconfig
@@ -1,4 +1,4 @@
-if S390
+if S390 && BLOCK
comment "S/390 block device drivers"
depends on S390
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 96a81cd..afcbe19 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -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
@@ -43,7 +45,7 @@ comment "SCSI support type (disk, tape,
config BLK_DEV_SD
tristate "SCSI disk support"
- depends on SCSI
+ depends on SCSI && BLOCK
---help---
If you want to use SCSI hard disks, Fibre Channel disks,
USB storage or the SCSI or parallel port version of
@@ -98,7 +100,7 @@ config CHR_DEV_OSST
config BLK_DEV_SR
tristate "SCSI CDROM support"
- depends on SCSI
+ depends on SCSI && BLOCK
---help---
If you want to use a SCSI or FireWire CD-ROM under Linux,
say Y and read the SCSI-HOWTO and the CDROM-HOWTO at
@@ -473,7 +475,7 @@ source "drivers/scsi/megaraid/Kconfig.me
config SCSI_SATA
tristate "Serial ATA (SATA) support"
- depends on SCSI
+ depends on SCSI && BLOCK
help
This driver family supports Serial ATA host controllers
and devices.
diff --git a/drivers/usb/storage/Kconfig b/drivers/usb/storage/Kconfig
index be9eec2..578aa13 100644
--- a/drivers/usb/storage/Kconfig
+++ b/drivers/usb/storage/Kconfig
@@ -8,7 +8,7 @@ comment "may also be needed; see USB_STO
config USB_STORAGE
tristate "USB Mass Storage support"
- depends on USB
+ depends on USB && BLOCK
select SCSI
---help---
Say Y here if you want to connect USB mass storage devices to your
diff --git a/fs/Kconfig b/fs/Kconfig
index 3f00a9f..dc5e69b 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -4,6 +4,8 @@ #
menu "File systems"
+if BLOCK
+
config EXT2_FS
tristate "Second extended fs support"
help
@@ -383,8 +385,11 @@ config MINIX_FS
partition (the one containing the directory /) cannot be compiled as
a module.
+endif
+
config ROMFS_FS
tristate "ROM file system support"
+ depends on BLOCK
---help---
This is a very small read-only file system mainly intended for
initial ram disks of installation disks, but it could be used for
@@ -530,6 +535,7 @@ 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 +603,9 @@ 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 +790,7 @@ config NTFS_RW
It is perfectly safe to say N here.
endmenu
+endif
menu "Pseudo filesystems"
@@ -907,7 +916,7 @@ 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
@@ -935,7 +944,7 @@ 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
@@ -957,7 +966,7 @@ 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
@@ -970,6 +979,7 @@ config HFS_FS
config HFSPLUS_FS
tristate "Apple Extended HFS file system support"
+ depends on BLOCK
select NLS
select NLS_UTF8
help
@@ -983,7 +993,7 @@ 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
@@ -1010,7 +1020,7 @@ 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
@@ -1032,7 +1042,7 @@ 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
@@ -1047,7 +1057,7 @@ 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
@@ -1232,6 +1242,7 @@ 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
@@ -1251,6 +1262,7 @@ 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
@@ -1268,6 +1280,7 @@ 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
@@ -1284,6 +1297,7 @@ 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).
@@ -1311,6 +1325,7 @@ 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
@@ -1349,6 +1364,7 @@ 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
@@ -1923,11 +1939,13 @@ config 9P_FS
endmenu
+if BLOCK
menu "Partition Types"
source "fs/partitions/Kconfig"
endmenu
+endif
source "fs/nls/Kconfig"
diff --git a/fs/Makefile b/fs/Makefile
index 8913542..8071c64 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -5,12 +5,18 @@ # 14 Sep 2000, Christoph Hellwig <hch@in
# 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
diff --git a/fs/afs/file.c b/fs/afs/file.c
index 67d6634..e1ba855 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -37,7 +37,7 @@ struct inode_operations afs_file_inode_o
const struct address_space_operations afs_fs_aops = {
.readpage = afs_file_readpage,
- .sync_page = block_sync_page,
+// .sync_page = block_sync_page,
.set_page_dirty = __set_page_dirty_nobuffers,
.releasepage = afs_file_releasepage,
.invalidatepage = afs_file_invalidatepage,
diff --git a/fs/buffer.c b/fs/buffer.c
index 71649ef..314b9c4 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -159,31 +159,6 @@ int sync_blockdev(struct block_device *b
}
EXPORT_SYMBOL(sync_blockdev);
-static void __fsync_super(struct super_block *sb)
-{
- sync_inodes_sb(sb, 0);
- DQUOT_SYNC(sb);
- lock_super(sb);
- if (sb->s_dirt && sb->s_op->write_super)
- sb->s_op->write_super(sb);
- unlock_super(sb);
- if (sb->s_op->sync_fs)
- sb->s_op->sync_fs(sb, 1);
- sync_blockdev(sb->s_bdev);
- sync_inodes_sb(sb, 1);
-}
-
-/*
- * Write out and wait upon all dirty data associated with this
- * superblock. Filesystem data as well as the underlying block
- * device. Takes the superblock lock.
- */
-int fsync_super(struct super_block *sb)
-{
- __fsync_super(sb);
- return sync_blockdev(sb->s_bdev);
-}
-
/*
* Write out and wait upon all dirty data associated with this
* device. Filesystem data as well as the underlying block
@@ -260,118 +235,6 @@ void thaw_bdev(struct block_device *bdev
EXPORT_SYMBOL(thaw_bdev);
/*
- * sync everything. Start out by waking pdflush, because that writes back
- * all queues in parallel.
- */
-static void do_sync(unsigned long wait)
-{
- wakeup_pdflush(0);
- sync_inodes(0); /* All mappings, inodes and their blockdevs */
- DQUOT_SYNC(NULL);
- sync_supers(); /* Write the superblocks */
- sync_filesystems(0); /* Start syncing the filesystems */
- sync_filesystems(wait); /* Waitingly sync the filesystems */
- sync_inodes(wait); /* Mappings, inodes and blockdevs, again. */
- if (!wait)
- printk("Emergency Sync complete\n");
- if (unlikely(laptop_mode))
- laptop_sync_completion();
-}
-
-asmlinkage long sys_sync(void)
-{
- do_sync(1);
- return 0;
-}
-
-void emergency_sync(void)
-{
- pdflush_operation(do_sync, 0);
-}
-
-/*
- * Generic function to fsync a file.
- *
- * filp may be NULL if called via the msync of a vma.
- */
-
-int file_fsync(struct file *filp, struct dentry *dentry, int datasync)
-{
- struct inode * inode = dentry->d_inode;
- struct super_block * sb;
- int ret, err;
-
- /* sync the inode to buffers */
- ret = write_inode_now(inode, 0);
-
- /* sync the superblock to buffers */
- sb = inode->i_sb;
- lock_super(sb);
- if (sb->s_op->write_super)
- sb->s_op->write_super(sb);
- unlock_super(sb);
-
- /* .. finally sync the buffers to disk */
- err = sync_blockdev(sb->s_bdev);
- if (!ret)
- ret = err;
- return ret;
-}
-
-long do_fsync(struct file *file, int datasync)
-{
- int ret;
- int err;
- struct address_space *mapping = file->f_mapping;
-
- if (!file->f_op || !file->f_op->fsync) {
- /* Why? We can still call filemap_fdatawrite */
- ret = -EINVAL;
- goto out;
- }
-
- ret = filemap_fdatawrite(mapping);
-
- /*
- * We need to protect against concurrent writers, which could cause
- * livelocks in fsync_buffers_list().
- */
- mutex_lock(&mapping->host->i_mutex);
- err = file->f_op->fsync(file, file->f_dentry, datasync);
- if (!ret)
- ret = err;
- mutex_unlock(&mapping->host->i_mutex);
- err = filemap_fdatawait(mapping);
- if (!ret)
- ret = err;
-out:
- return ret;
-}
-
-static long __do_fsync(unsigned int fd, int datasync)
-{
- struct file *file;
- int ret = -EBADF;
-
- file = fget(fd);
- if (file) {
- ret = do_fsync(file, datasync);
- fput(file);
- }
- return ret;
-}
-
-asmlinkage long sys_fsync(unsigned int fd)
-{
- return __do_fsync(fd, 0);
-}
-
-asmlinkage long sys_fdatasync(unsigned int fd)
-{
- return __do_fsync(fd, 1);
-}
-
-/*
* Various filesystems appear to want __find_get_block to be non-blocking.
* But it's the page lock which protects the buffers. To get around this,
* we get exclusion from try_to_free_buffers with the blockdev mapping's
@@ -1551,35 +1414,6 @@ static void discard_buffer(struct buffer
}
/**
- * try_to_release_page() - release old fs-specific metadata on a page
- *
- * @page: the page which the kernel is trying to free
- * @gfp_mask: memory allocation flags (and I/O mode)
- *
- * The address_space is to try to release any data against the page
- * (presumably at page->private). If the release was successful, return `1'.
- * Otherwise return zero.
- *
- * The @gfp_mask argument specifies whether I/O may be performed to release
- * this page (__GFP_IO), and whether the call may block (__GFP_WAIT).
- *
- * NOTE: @gfp_mask may go away, and this function may become non-blocking.
- */
-int try_to_release_page(struct page *page, gfp_t gfp_mask)
-{
- struct address_space * const mapping = page->mapping;
-
- BUG_ON(!PageLocked(page));
- if (PageWriteback(page))
- return 0;
-
- if (mapping && mapping->a_ops->releasepage)
- return mapping->a_ops->releasepage(page, gfp_mask);
- return try_to_free_buffers(page);
-}
-EXPORT_SYMBOL(try_to_release_page);
-
-/**
* block_invalidatepage - invalidate part of all of a buffer-backed page
*
* @page: the page which is affected
@@ -1630,14 +1464,6 @@ out:
}
EXPORT_SYMBOL(block_invalidatepage);
-void do_invalidatepage(struct page *page, unsigned long offset)
-{
- void (*invalidatepage)(struct page *, unsigned long);
- invalidatepage = page->mapping->a_ops->invalidatepage ? :
- block_invalidatepage;
- (*invalidatepage)(page, offset);
-}
-
/*
* We attach and possibly dirty the buffers atomically wrt
* __set_page_dirty_buffers() via private_lock. try_to_free_buffers
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 4063a93..79c79a2 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -176,6 +176,7 @@ static int rw_long(unsigned int fd, unsi
return err;
}
+#ifdef CONFIG_BLOCK
static int do_ext2_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
{
/* These are just misnamed, they actually get/put from/to user an int */
@@ -203,6 +204,7 @@ #endif
}
return sys_ioctl(fd, cmd, (unsigned long)compat_ptr(arg));
}
+#endif
struct compat_video_event {
int32_t type;
@@ -694,6 +696,7 @@ out:
}
#endif
+#ifdef CONFIG_BLOCK
struct hd_geometry32 {
unsigned char heads;
unsigned char sectors;
@@ -918,6 +921,7 @@ static int sg_grt_trans(unsigned int fd,
}
return err;
}
+#endif /* CONFIG_BLOCK */
struct sock_fprog32 {
unsigned short len;
@@ -1041,6 +1045,7 @@ static int ppp_ioctl_trans(unsigned int
}
+#ifdef CONFIG_BLOCK
struct mtget32 {
compat_long_t mt_type;
compat_long_t mt_resid;
@@ -1228,7 +1233,9 @@ struct loop_info32 {
compat_ulong_t lo_init[2];
char reserved[4];
};
+#endif
+#ifdef CONFIG_BLOCK
static int loop_status(unsigned int fd, unsigned int cmd, unsigned long arg)
{
mm_segment_t old_fs = get_fs();
@@ -1278,6 +1285,7 @@ static int loop_status(unsigned int fd,
}
return err;
}
+#endif
extern int tty_ioctl(struct inode * inode, struct file * file, unsigned int cmd, unsigned long arg);
@@ -1607,6 +1615,7 @@ ret_einval(unsigned int fd, unsigned int
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 :-((( */
@@ -1641,12 +1650,14 @@ static int blkpg_ioctl_trans(unsigned in
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)
@@ -1667,6 +1678,7 @@ static int do_blkgetsize64(unsigned int
{
return sys_ioctl(fd, BLKGETSIZE64, (unsigned long)compat_ptr(arg));
}
+#endif
/* Bluetooth ioctls */
#define HCIUARTSETPROTO _IOW('U', 200, int)
@@ -1687,6 +1699,7 @@ #define HIDPCONNDEL _IOW('H', 201, int)
#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;
@@ -2011,6 +2024,7 @@ out:
kfree(karg);
return err;
}
+#endif
struct mtd_oob_buf32 {
u_int32_t start;
@@ -2055,6 +2069,7 @@ static int mtd_rw_oob(unsigned int fd, u
#define VFAT_IOCTL_READDIR_BOTH32 _IOR('r', 1, struct compat_dirent[2])
#define VFAT_IOCTL_READDIR_SHORT32 _IOR('r', 2, struct compat_dirent[2])
+#ifdef CONFIG_BLOCK
static long
put_dirent32 (struct dirent *d, struct compat_dirent __user *d32)
{
@@ -2171,6 +2186,7 @@ static int raw_ioctl(unsigned fd, unsign
}
return ret;
}
+#endif
struct serial_struct32 {
compat_int_t type;
@@ -2777,6 +2793,7 @@ 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)
@@ -2802,16 +2819,19 @@ HANDLE_IOCTL(FDGETFDCSTAT32, fd_ioctl_tr
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)
HANDLE_IOCTL(LOOP_SET_STATUS, loop_status)
HANDLE_IOCTL(LOOP_GET_STATUS, loop_status)
+#endif
#define AUTOFS_IOC_SETTIMEOUT32 _IOWR(0x93,0x64,unsigned int)
HANDLE_IOCTL(AUTOFS_IOC_SETTIMEOUT32, ioc_settimeout)
#ifdef CONFIG_VT
@@ -2821,6 +2841,7 @@ HANDLE_IOCTL(PIO_UNIMAP, do_unimap_ioctl
HANDLE_IOCTL(GIO_UNIMAP, do_unimap_ioctl)
HANDLE_IOCTL(KDFONTOP, do_kdfontop_ioctl)
#endif
+#ifdef CONFIG_BLOCK
HANDLE_IOCTL(EXT2_IOC32_GETFLAGS, do_ext2_ioctl)
HANDLE_IOCTL(EXT2_IOC32_SETFLAGS, do_ext2_ioctl)
HANDLE_IOCTL(EXT2_IOC32_GETVERSION, do_ext2_ioctl)
@@ -2834,6 +2855,7 @@ COMPATIBLE_IOCTL(EXT3_IOC_GROUP_ADD)
#ifdef CONFIG_JBD_DEBUG
HANDLE_IOCTL(EXT3_IOC32_WAIT_FOR_READONLY, do_ext3_ioctl)
#endif
+#endif
/* One SMB ioctl needs translations. */
#define SMB_IOC_GETMOUNTUID_32 _IOR('u', 1, compat_uid_t)
HANDLE_IOCTL(SMB_IOC_GETMOUNTUID_32, do_smb_getmountuid)
@@ -2863,6 +2885,7 @@ HANDLE_IOCTL(SONET_SETFRAMING, do_atm_io
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)
@@ -2873,6 +2896,7 @@ HANDLE_IOCTL(REISERFS_IOC_UNPACK32, reis
/* 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)
diff --git a/fs/dcache.c b/fs/dcache.c
index 1b4a3a3..886ca6f 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -32,6 +32,7 @@ #include <linux/security.h>
#include <linux/seqlock.h>
#include <linux/swap.h>
#include <linux/bootmem.h>
+#include <linux/blkdev.h>
int sysctl_vfs_cache_pressure __read_mostly = 100;
@@ -1742,7 +1743,6 @@ kmem_cache_t *filp_cachep __read_mostly;
EXPORT_SYMBOL(d_genocide);
-extern void bdev_cache_init(void);
extern void chrdev_init(void);
void __init vfs_caches_init_early(void)
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 892643d..d0c5ea7 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -23,7 +23,11 @@ #include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/buffer_head.h>
-extern struct super_block *blockdev_superblock;
+#ifdef CONFIG_BLOCK
+#define sb_is_blkdev_sb(sb) ((sb) == blockdev_superblock)
+#else
+#define sb_is_blkdev_sb(sb) 0
+#endif
/**
* __mark_inode_dirty - internal function
@@ -320,7 +324,7 @@ sync_sb_inodes(struct super_block *sb, s
if (!bdi_cap_writeback_dirty(bdi)) {
list_move(&inode->i_list, &sb->s_dirty);
- if (sb == blockdev_superblock) {
+ if (sb_is_blkdev_sb(sb)) {
/*
* Dirty memory-backed blockdev: the ramdisk
* driver does this. Skip just this inode
@@ -337,14 +341,14 @@ sync_sb_inodes(struct super_block *sb, s
if (wbc->nonblocking && bdi_write_congested(bdi)) {
wbc->encountered_congestion = 1;
- if (sb != blockdev_superblock)
+ if (!sb_is_blkdev_sb(sb))
break; /* Skip a congested fs */
list_move(&inode->i_list, &sb->s_dirty);
continue; /* Skip a congested blockdev */
}
if (wbc->bdi && bdi != wbc->bdi) {
- if (sb != blockdev_superblock)
+ if (!sb_is_blkdev_sb(sb))
break; /* fs has the wrong queue */
list_move(&inode->i_list, &sb->s_dirty);
continue; /* blockdev has wrong queue */
diff --git a/fs/inode.c b/fs/inode.c
index 0bf9f04..cdfff1f 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -254,8 +254,10 @@ void clear_inode(struct inode *inode)
DQUOT_DROP(inode);
if (inode->i_sb && inode->i_sb->s_op->clear_inode)
inode->i_sb->s_op->clear_inode(inode);
+#ifdef CONFIG_BLOCK
if (inode->i_bdev)
bd_forget(inode);
+#endif
if (inode->i_cdev)
cd_forget(inode);
inode->i_state = I_CLEAR;
@@ -363,7 +365,8 @@ int invalidate_inodes(struct super_block
}
EXPORT_SYMBOL(invalidate_inodes);
-
+
+#ifdef CONFIG_BLOCK
int __invalidate_device(struct block_device *bdev)
{
struct super_block *sb = get_super(bdev);
@@ -384,6 +387,7 @@ int __invalidate_device(struct block_dev
return res;
}
EXPORT_SYMBOL(__invalidate_device);
+#endif
static int can_unuse(struct inode *inode)
{
diff --git a/fs/no-block.c b/fs/no-block.c
new file mode 100644
index 0000000..eccea07
--- /dev/null
+++ b/fs/no-block.c
@@ -0,0 +1,160 @@
+/* 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@...hat.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/module.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/mpage.h>
+#include <linux/writeback.h>
+#include <linux/backing-dev.h>
+#include <linux/pagevec.h>
+#include <linux/pagemap.h>
+
+/**
+ * generic_writepages - walk the list of dirty pages of the given
+ * address space and writepage() all of them.
+ *
+ * @mapping: address space structure to write
+ * @wbc: subtract the number of written pages from *@...->nr_to_write
+ *
+ * This is a library function, which implements the writepages()
+ * address_space_operation.
+ *
+ * If a page is already under I/O, generic_writepages() skips it, even
+ * if it's dirty. This is desirable behaviour for memory-cleaning writeback,
+ * but it is INCORRECT for data-integrity system calls such as fsync(). fsync()
+ * and msync() need to guarantee that all the data which was dirty at the time
+ * the call was made get new I/O started against them. If wbc->sync_mode is
+ * WB_SYNC_ALL then we were called for data integrity and we must wait for
+ * existing IO to complete.
+ */
+int generic_writepages(struct address_space *mapping,
+ struct writeback_control *wbc)
+{
+ struct backing_dev_info *bdi = mapping->backing_dev_info;
+ int ret = 0;
+ int done = 0;
+ int (*writepage)(struct page *page, struct writeback_control *wbc);
+ struct pagevec pvec;
+ int nr_pages;
+ pgoff_t index;
+ pgoff_t end; /* Inclusive */
+ int scanned = 0;
+ int range_whole = 0;
+
+ if (wbc->nonblocking && bdi_write_congested(bdi)) {
+ wbc->encountered_congestion = 1;
+ return 0;
+ }
+
+ writepage = mapping->a_ops->writepage;
+
+ /* deal with chardevs and other special file */
+ if (!writepage)
+ return 0;
+
+ pagevec_init(&pvec, 0);
+ if (wbc->range_cyclic) {
+ index = mapping->writeback_index; /* Start from prev offset */
+ end = -1;
+ } else {
+ index = wbc->range_start >> PAGE_CACHE_SHIFT;
+ end = wbc->range_end >> PAGE_CACHE_SHIFT;
+ if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
+ range_whole = 1;
+ scanned = 1;
+ }
+retry:
+ while (!done && (index <= end) &&
+ (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
+ PAGECACHE_TAG_DIRTY,
+ min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) {
+ unsigned i;
+
+ scanned = 1;
+ for (i = 0; i < nr_pages; i++) {
+ struct page *page = pvec.pages[i];
+
+ /*
+ * At this point we hold neither mapping->tree_lock nor
+ * lock on the page itself: the page may be truncated or
+ * invalidated (changing page->mapping to NULL), or even
+ * swizzled back from swapper_space to tmpfs file
+ * mapping
+ */
+
+ lock_page(page);
+
+ if (unlikely(page->mapping != mapping)) {
+ unlock_page(page);
+ continue;
+ }
+
+ if (!wbc->range_cyclic && page->index > end) {
+ done = 1;
+ unlock_page(page);
+ continue;
+ }
+
+ if (wbc->sync_mode != WB_SYNC_NONE)
+ wait_on_page_writeback(page);
+
+ if (PageWriteback(page) ||
+ !clear_page_dirty_for_io(page)) {
+ unlock_page(page);
+ continue;
+ }
+
+ ret = (*writepage)(page, wbc);
+ if (ret) {
+ if (ret == -ENOSPC)
+ set_bit(AS_ENOSPC, &mapping->flags);
+ else
+ set_bit(AS_EIO, &mapping->flags);
+ }
+
+ if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE))
+ unlock_page(page);
+ if (ret || (--(wbc->nr_to_write) <= 0))
+ done = 1;
+ if (wbc->nonblocking && bdi_write_congested(bdi)) {
+ wbc->encountered_congestion = 1;
+ done = 1;
+ }
+ }
+ pagevec_release(&pvec);
+ cond_resched();
+ }
+ if (!scanned && !done) {
+ /*
+ * We hit the last page and there is more work to be done: wrap
+ * back to the start of the file
+ */
+ scanned = 1;
+ index = 0;
+ goto retry;
+ }
+ if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
+ mapping->writeback_index = index;
+ return ret;
+}
+
+EXPORT_SYMBOL(generic_writepages);
+
+static int no_blkdev_open(struct inode * inode, struct file * filp)
+{
+ return -ENODEV;
+}
+
+const struct file_operations def_blk_fops = {
+ .open = no_blkdev_open,
+};
diff --git a/fs/partitions/Makefile b/fs/partitions/Makefile
index d713ce6..67e665f 100644
--- a/fs/partitions/Makefile
+++ b/fs/partitions/Makefile
@@ -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
diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index 9f2cfc3..ed8646e 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -268,12 +268,15 @@ static int devinfo_show(struct seq_file
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;
}
@@ -346,6 +349,7 @@ static int stram_read_proc(char *page, c
}
#endif
+#ifdef CONFIG_BLOCK
extern struct seq_operations partitions_op;
static int partitions_open(struct inode *inode, struct file *file)
{
@@ -369,6 +373,7 @@ static struct file_operations proc_disks
.llseek = seq_lseek,
.release = seq_release,
};
+#endif
#ifdef CONFIG_MODULES
extern struct seq_operations modules_op;
@@ -686,7 +691,9 @@ #endif
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
@@ -698,7 +705,9 @@ #endif
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
diff --git a/fs/quota.c b/fs/quota.c
index d6a2be8..0116fb1 100644
--- a/fs/quota.c
+++ b/fs/quota.c
@@ -347,15 +347,15 @@ asmlinkage long sys_quotactl(unsigned in
{
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);
+#ifdef CONFIG_BLOCK
+ struct block_device *bdev;
+ char *tmp = getname(special);
if (IS_ERR(tmp))
return PTR_ERR(tmp);
bdev = lookup_bdev(tmp);
@@ -366,6 +366,9 @@ asmlinkage long sys_quotactl(unsigned in
bdput(bdev);
if (!sb)
return -ENODEV;
+#else
+ return -ENODEV;
+#endif
}
ret = check_quotactl_valid(sb, type, cmds, id);
diff --git a/fs/super.c b/fs/super.c
index 6d4e817..33ce475 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -219,6 +219,37 @@ static int grab_super(struct super_block
return 0;
}
+/*
+ * Write out and wait upon all dirty data associated with this
+ * superblock. Filesystem data as well as the underlying block
+ * device. Takes the superblock lock. Requires a second blkdev
+ * flush by the caller to complete the operation.
+ */
+void __fsync_super(struct super_block *sb)
+{
+ sync_inodes_sb(sb, 0);
+ DQUOT_SYNC(sb);
+ lock_super(sb);
+ if (sb->s_dirt && sb->s_op->write_super)
+ sb->s_op->write_super(sb);
+ unlock_super(sb);
+ if (sb->s_op->sync_fs)
+ sb->s_op->sync_fs(sb, 1);
+ sync_blockdev(sb->s_bdev);
+ sync_inodes_sb(sb, 1);
+}
+
+/*
+ * Write out and wait upon all dirty data associated with this
+ * superblock. Filesystem data as well as the underlying block
+ * device. Takes the superblock lock.
+ */
+int fsync_super(struct super_block *sb)
+{
+ __fsync_super(sb);
+ return sync_blockdev(sb->s_bdev);
+}
+
/**
* generic_shutdown_super - common helper for ->kill_sb()
* @sb: superblock to kill
@@ -539,8 +570,10 @@ int do_remount_sb(struct super_block *sb
{
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);
@@ -660,6 +693,7 @@ void kill_litter_super(struct super_bloc
EXPORT_SYMBOL(kill_litter_super);
+#ifdef CONFIG_BLOCK
static int set_bdev_super(struct super_block *s, void *data)
{
s->s_bdev = data;
@@ -755,6 +789,7 @@ void kill_block_super(struct super_block
}
EXPORT_SYMBOL(kill_block_super);
+#endif
int get_sb_nodev(struct file_system_type *fs_type,
int flags, void *data,
diff --git a/fs/sync.c b/fs/sync.c
index 955aef0..1de747b 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -10,11 +10,124 @@ #include <linux/writeback.h>
#include <linux/syscalls.h>
#include <linux/linkage.h>
#include <linux/pagemap.h>
+#include <linux/quotaops.h>
+#include <linux/buffer_head.h>
#define VALID_FLAGS (SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE| \
SYNC_FILE_RANGE_WAIT_AFTER)
/*
+ * sync everything. Start out by waking pdflush, because that writes back
+ * all queues in parallel.
+ */
+static void do_sync(unsigned long wait)
+{
+ wakeup_pdflush(0);
+ sync_inodes(0); /* All mappings, inodes and their blockdevs */
+ DQUOT_SYNC(NULL);
+ sync_supers(); /* Write the superblocks */
+ sync_filesystems(0); /* Start syncing the filesystems */
+ sync_filesystems(wait); /* Waitingly sync the filesystems */
+ sync_inodes(wait); /* Mappings, inodes and blockdevs, again. */
+ if (!wait)
+ printk("Emergency Sync complete\n");
+ if (unlikely(laptop_mode))
+ laptop_sync_completion();
+}
+
+asmlinkage long sys_sync(void)
+{
+ do_sync(1);
+ return 0;
+}
+
+void emergency_sync(void)
+{
+ pdflush_operation(do_sync, 0);
+}
+
+/*
+ * Generic function to fsync a file.
+ *
+ * filp may be NULL if called via the msync of a vma.
+ */
+int file_fsync(struct file *filp, struct dentry *dentry, int datasync)
+{
+ struct inode * inode = dentry->d_inode;
+ struct super_block * sb;
+ int ret, err;
+
+ /* sync the inode to buffers */
+ ret = write_inode_now(inode, 0);
+
+ /* sync the superblock to buffers */
+ sb = inode->i_sb;
+ lock_super(sb);
+ if (sb->s_op->write_super)
+ sb->s_op->write_super(sb);
+ unlock_super(sb);
+
+ /* .. finally sync the buffers to disk */
+ err = sync_blockdev(sb->s_bdev);
+ if (!ret)
+ ret = err;
+ return ret;
+}
+
+long do_fsync(struct file *file, int datasync)
+{
+ int ret;
+ int err;
+ struct address_space *mapping = file->f_mapping;
+
+ if (!file->f_op || !file->f_op->fsync) {
+ /* Why? We can still call filemap_fdatawrite */
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = filemap_fdatawrite(mapping);
+
+ /*
+ * We need to protect against concurrent writers, which could cause
+ * livelocks in fsync_buffers_list().
+ */
+ mutex_lock(&mapping->host->i_mutex);
+ err = file->f_op->fsync(file, file->f_dentry, datasync);
+ if (!ret)
+ ret = err;
+ mutex_unlock(&mapping->host->i_mutex);
+ err = filemap_fdatawait(mapping);
+ if (!ret)
+ ret = err;
+out:
+ return ret;
+}
+
+static long __do_fsync(unsigned int fd, int datasync)
+{
+ struct file *file;
+ int ret = -EBADF;
+
+ file = fget(fd);
+ if (file) {
+ ret = do_fsync(file, datasync);
+ fput(file);
+ }
+ return ret;
+}
+
+asmlinkage long sys_fsync(unsigned int fd)
+{
+ return __do_fsync(fd, 0);
+}
+
+asmlinkage long sys_fdatasync(unsigned int fd)
+{
+ return __do_fsync(fd, 1);
+}
+
+/*
* sys_sync_file_range() permits finely controlled syncing over a segment of
* a file in the range offset .. (offset+nbytes-1) inclusive. If nbytes is
* zero then sys_sync_file_range() will operate from offset out to EOF.
diff --git a/fs/xfs/Kconfig b/fs/xfs/Kconfig
index 26b364c..35115bc 100644
--- a/fs/xfs/Kconfig
+++ b/fs/xfs/Kconfig
@@ -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
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index aafe827..afde0ab 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -16,6 +16,23 @@ #include <linux/stringify.h>
#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
+extern struct super_block *blockdev_superblock;
+
struct scsi_ioctl_command;
struct request_queue;
@@ -821,24 +838,32 @@ 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) "-*")
+extern void bdev_cache_init(void);
+
+#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 bdev_cache_init(void) {}
+static inline void exit_io_context(void) {}
+
+#endif /* CONFIG_BLOCK */
#endif
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index 7520cc1..d3cc58a 100644
--- a/include/linux/blktrace_api.h
+++ b/include/linux/blktrace_api.h
@@ -4,6 +4,8 @@ #define BLKTRACE_H
#include <linux/blkdev.h>
#include <linux/relay.h>
+#ifdef CONFIG_BLOCK
+
/*
* Trace categories
*/
@@ -129,7 +131,9 @@ struct blk_user_trace_setup {
u32 pid;
};
-#if defined(CONFIG_BLK_DEV_IO_TRACE)
+#endif
+
+#if defined(CONFIG_BLK_DEV_IO_TRACE) && defined(CONFIG_BLOCK)
extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
extern void blk_trace_shutdown(request_queue_t *);
extern void __blk_add_trace(struct blk_trace *, sector_t, int, int, u32, int, int, void *);
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 737e407..131ffd3 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -14,6 +14,8 @@ #include <linux/pagemap.h>
#include <linux/wait.h>
#include <asm/atomic.h>
+#ifdef CONFIG_BLOCK
+
enum bh_state_bits {
BH_Uptodate, /* Contains valid data */
BH_Dirty, /* Is dirty */
@@ -190,9 +192,7 @@ extern int buffer_heads_over_limit;
* Generic address_space_operations implementations for buffer_head-backed
* address_spaces.
*/
-int try_to_release_page(struct page * page, gfp_t gfp_mask);
void block_invalidatepage(struct page *page, unsigned long offset);
-void do_invalidatepage(struct page *page, unsigned long offset);
int block_write_full_page(struct page *page, get_block_t *get_block,
struct writeback_control *wbc);
int block_read_full_page(struct page*, get_block_t*);
@@ -302,4 +302,19 @@ static inline void lock_buffer(struct bu
__lock_buffer(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 */
diff --git a/include/linux/compat_ioctl.h b/include/linux/compat_ioctl.h
index 269d000..0dd47d8 100644
--- a/include/linux/compat_ioctl.h
+++ b/include/linux/compat_ioctl.h
@@ -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)
@@ -395,11 +397,13 @@ COMPATIBLE_IOCTL(DVD_AUTH)
/* pktcdvd */
COMPATIBLE_IOCTL(PACKET_CTRL_CMD)
/* Big L */
+#ifdef CONFIG_BLOCK
ULONG_IOCTL(LOOP_SET_FD)
ULONG_IOCTL(LOOP_CHANGE_FD)
COMPATIBLE_IOCTL(LOOP_CLR_FD)
COMPATIBLE_IOCTL(LOOP_GET_STATUS64)
COMPATIBLE_IOCTL(LOOP_SET_STATUS64)
+#endif
/* Big A */
/* sparc only */
/* Big Q for sound/OSS */
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index 1713ace..d2f4b0a 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -1,6 +1,8 @@
#ifndef _LINUX_ELEVATOR_H
#define _LINUX_ELEVATOR_H
+#ifdef CONFIG_BLOCK
+
typedef int (elevator_merge_fn) (request_queue_t *, struct request **,
struct bio *);
@@ -150,4 +152,5 @@ enum {
#define rq_end_sector(rq) ((rq)->sector + (rq)->nr_sectors)
+#endif /* CONFIG_BLOCK */
#endif
diff --git a/include/linux/ext3_fs.h b/include/linux/ext3_fs.h
index 9f9cce7..75697f7 100644
--- a/include/linux/ext3_fs.h
+++ b/include/linux/ext3_fs.h
@@ -18,6 +18,8 @@ #define _LINUX_EXT3_FS_H
#include <linux/types.h>
+#if defined(CONFIG_EXT3_FS) || defined(CONFIG_EXT3_FS_MODULE)
+
/*
* The second extended filesystem constants/structures
*/
@@ -868,4 +870,5 @@ extern struct inode_operations ext3_fast
#endif /* __KERNEL__ */
+#endif /* CONFIG_EXT3_FS */
#endif /* _LINUX_EXT3_FS_H */
diff --git a/include/linux/ext3_jbd.h b/include/linux/ext3_jbd.h
index c8307c0..9dc4348 100644
--- a/include/linux/ext3_jbd.h
+++ b/include/linux/ext3_jbd.h
@@ -19,6 +19,8 @@ #include <linux/fs.h>
#include <linux/jbd.h>
#include <linux/ext3_fs.h>
+#if defined(CONFIG_EXT3_FS) || defined(CONFIG_EXT3_FS_MODULE)
+
#define EXT3_JOURNAL(inode) (EXT3_SB((inode)->i_sb)->s_journal)
/* Define the number of blocks we need to account to a transaction to
@@ -265,4 +267,5 @@ static inline int ext3_should_writeback_
return 0;
}
+#endif /* CONFIG_EXT3_FS */
#endif /* _LINUX_EXT3_JBD_H */
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 2561020..9536426 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1438,6 +1438,7 @@ #else
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);
@@ -1446,11 +1447,13 @@ extern void bd_forget(struct inode *inod
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;
+#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);
@@ -1466,6 +1469,7 @@ #else
#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
@@ -1479,6 +1483,7 @@ extern int chrdev_open(struct inode *, s
extern void chrdev_show(struct seq_file *,off_t);
/* fs/block_dev.c */
+#ifdef CONFIG_BLOCK
#define BLKDEV_MAJOR_HASH_SIZE 255
#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
extern const char *__bdevname(dev_t, char *buffer);
@@ -1487,6 +1492,9 @@ extern struct block_device *lookup_bdev(
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);
@@ -1500,6 +1508,7 @@ extern const struct file_operations rdwr
extern int fs_may_remount_ro(struct super_block *);
+#ifdef CONFIG_BLOCK
/*
* return READ, READA, or WRITE
*/
@@ -1511,9 +1520,10 @@ #define bio_rw(bio) ((bio)->bi_rw & (RW
#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);
@@ -1541,11 +1551,14 @@ extern int __filemap_fdatawrite_range(st
extern long do_fsync(struct file *file, int datasync);
extern void sync_supers(void);
extern void sync_filesystems(int wait);
+extern void __fsync_super(struct super_block *sb);
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,
@@ -1628,9 +1641,11 @@ static inline void insert_inode_hash(str
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);
@@ -1711,6 +1726,7 @@ static inline void do_generic_file_read(
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,
@@ -1748,6 +1764,7 @@ static inline ssize_t blockdev_direct_IO
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;
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index e4af57e..41f276f 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -11,6 +11,8 @@ #define _LINUX_GENHD_H
#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
#endif
#endif
+
+#endif
diff --git a/include/linux/jbd.h b/include/linux/jbd.h
index 20eb344..4e5b1d1 100644
--- a/include/linux/jbd.h
+++ b/include/linux/jbd.h
@@ -34,6 +34,8 @@ #include <linux/timer.h>
#include <asm/semaphore.h>
#endif
+#if defined(CONFIG_JBD) || defined(CONFIG_JBD_MODULE)
+
#define journal_oom_retry 1
/*
@@ -1093,4 +1095,5 @@ #define JBUFFER_TRACE(jh, info) do {} wh
#endif /* __KERNEL__ */
+#endif /* CONFIG_JBD */
#endif /* _LINUX_JBD_H */
diff --git a/include/linux/loop.h b/include/linux/loop.h
index e76c761..b8b733a 100644
--- a/include/linux/loop.h
+++ b/include/linux/loop.h
@@ -1,6 +1,8 @@
#ifndef _LINUX_LOOP_H
#define _LINUX_LOOP_H
+#if defined(CONFIG_BLK_DEV_LOOP) || defined(CONFIG_BLK_DEV_LOOP_MODULE)
+
/*
* include/linux/loop.h
*
@@ -159,4 +161,5 @@ #define LOOP_SET_STATUS64 0x4C04
#define LOOP_GET_STATUS64 0x4C05
#define LOOP_CHANGE_FD 0x4C06
+#endif /* CONFIG_BLK_DEV_LOOP */
#endif
diff --git a/include/linux/mm.h b/include/linux/mm.h
index f0b135c..c3c25ef 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -767,7 +767,9 @@ int get_user_pages(struct task_struct *t
int len, int write, int force, struct page **pages, struct vm_area_struct **vmas);
void print_bad_pte(struct vm_area_struct *, pte_t, unsigned long);
-int __set_page_dirty_buffers(struct page *page);
+extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
+extern void do_invalidatepage(struct page *page, unsigned long offset);
+
int __set_page_dirty_nobuffers(struct page *page);
int redirty_page_for_writepage(struct writeback_control *wbc,
struct page *page);
diff --git a/include/linux/mpage.h b/include/linux/mpage.h
index 3ca8804..c70448f 100644
--- a/include/linux/mpage.h
+++ b/include/linux/mpage.h
@@ -21,8 +21,14 @@ int mpage_writepages(struct address_spac
int mpage_writepage(struct page *page, get_block_t *get_block,
struct writeback_control *wbc);
+#ifdef CONFIG_BLOCK
static inline int
generic_writepages(struct address_space *mapping, struct writeback_control *wbc)
{
return mpage_writepages(mapping, wbc, NULL);
}
+#else
+extern int generic_writepages(struct address_space *mapping,
+ struct writeback_control *wbc);
+
+#endif
diff --git a/include/linux/msdos_fs.h b/include/linux/msdos_fs.h
index d9035c7..a1e0f8b 100644
--- a/include/linux/msdos_fs.h
+++ b/include/linux/msdos_fs.h
@@ -6,6 +6,8 @@ #define _LINUX_MSDOS_FS_H
*/
#include <asm/byteorder.h>
+#if defined(CONFIG_MSDOS_FS) || defined(CONFIG_MSDOS_FS_MODULE)
+
#define SECTOR_SIZE 512 /* sector size (bytes) */
#define SECTOR_BITS 9 /* log2(SECTOR_SIZE) */
#define MSDOS_DPB (MSDOS_DPS) /* dir entries per block */
@@ -425,4 +427,5 @@ void fat_cache_destroy(void);
#endif /* __KERNEL__ */
+#endif /* CONFIG_MSDOS_FS */
#endif
diff --git a/include/linux/raid/md.h b/include/linux/raid/md.h
index eb3e547..c588709 100644
--- a/include/linux/raid/md.h
+++ b/include/linux/raid/md.h
@@ -53,6 +53,8 @@ #include <linux/raid/md_p.h>
#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
diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index d288902..920b94f 100644
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -18,6 +18,8 @@ #define _MD_K_H
/* 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
if (p) put_page(p);
}
+#endif /* CONFIG_BLOCK */
#endif
diff --git a/include/linux/reiserfs_fs.h b/include/linux/reiserfs_fs.h
index daa2d83..bfa067b 100644
--- a/include/linux/reiserfs_fs.h
+++ b/include/linux/reiserfs_fs.h
@@ -26,6 +26,8 @@ #include <linux/reiserfs_fs_i.h>
#include <linux/reiserfs_fs_sb.h>
#endif
+#if defined(CONFIG_REISERFS_FS) || defined(CONFIG_REISERFS_FS_MODULE)
+
/*
* include/linux/reiser_fs.h
*
@@ -2188,4 +2190,5 @@ #define reiserfs_write_unlock( sb ) unlo
/* xattr stuff */
#define REISERFS_XATTR_DIR_SEM(s) (REISERFS_SB(s)->xattr_dir_sem)
+#endif /* CONFIG_REISERFS_FS */
#endif /* _LINUX_REISER_FS_H */
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 6674fc1..c12c5f9 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -709,7 +709,6 @@ #endif /* CONFIG_SMP */
struct io_context; /* See blkdev.h */
-void exit_io_context(void);
struct cpuset;
#define NGROUPS_SMALL 32
diff --git a/include/scsi/scsi_tcq.h b/include/scsi/scsi_tcq.h
index e47e36a..bc34746 100644
--- a/include/scsi/scsi_tcq.h
+++ b/include/scsi/scsi_tcq.h
@@ -5,7 +5,6 @@ #include <linux/blkdev.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
-
#define MSG_SIMPLE_TAG 0x20
#define MSG_HEAD_TAG 0x21
#define MSG_ORDERED_TAG 0x22
@@ -13,6 +12,7 @@ #define MSG_ORDERED_TAG 0x22
#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
@@ -131,4 +131,5 @@ static inline struct scsi_cmnd *scsi_fin
return sdev->current_cmnd;
}
+#endif /* CONFIG_BLOCK */
#endif /* _SCSI_SCSI_TCQ_H */
diff --git a/init/Kconfig b/init/Kconfig
index a099fc6..814bacc 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -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
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 94aeec7..dbb2604 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -284,7 +284,11 @@ void __init mount_block_root(char *name,
{
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:
@@ -303,7 +307,9 @@ 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");
@@ -315,7 +321,10 @@ 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);
}
@@ -386,8 +395,10 @@ #ifdef CONFIG_BLK_DEV_FD
change_floppy("root floppy");
}
#endif
+#ifdef CONFIG_BLOCK
create_dev("/dev/root", ROOT_DEV);
mount_block_root("/dev/root", root_mountflags);
+#endif
}
/*
diff --git a/kernel/exit.c b/kernel/exit.c
index dba194a..e0abd78 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -38,6 +38,7 @@ #include <linux/compat.h>
#include <linux/pipe_fs_i.h>
#include <linux/audit.h> /* for audit_free() */
#include <linux/resource.h>
+#include <linux/blkdev.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 6991bec..7a3b2e7 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -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);
diff --git a/mm/Makefile b/mm/Makefile
index 9dd824c..3af3154 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -12,6 +12,7 @@ obj-y := bootmem.o filemap.o mempool.o
readahead.o swap.o truncate.o vmscan.o \
prio_tree.o util.o mmzone.o vmstat.o $(mmu-y)
+obj-$(CONFIG_BLOCK) += bounce.o
obj-$(CONFIG_SWAP) += page_io.o swap_state.o swapfile.o thrash.o
obj-$(CONFIG_HUGETLBFS) += hugetlb.o
obj-$(CONFIG_NUMA) += mempolicy.o
diff --git a/mm/bounce.c b/mm/bounce.c
new file mode 100644
index 0000000..e042f87
--- /dev/null
+++ b/mm/bounce.c
@@ -0,0 +1,302 @@
+/* bounce.c: bounce buffer handling for block devices
+ *
+ * - Split from highmem.c
+ */
+
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/swap.h>
+#include <linux/bio.h>
+#include <linux/pagemap.h>
+#include <linux/mempool.h>
+#include <linux/blkdev.h>
+#include <linux/init.h>
+#include <linux/hash.h>
+#include <linux/highmem.h>
+#include <linux/blktrace_api.h>
+#include <asm/tlbflush.h>
+
+#define POOL_SIZE 64
+#define ISA_POOL_SIZE 16
+
+static mempool_t *page_pool, *isa_page_pool;
+
+#ifdef CONFIG_HIGHMEM
+static __init int init_emergency_pool(void)
+{
+ struct sysinfo i;
+ si_meminfo(&i);
+ si_swapinfo(&i);
+
+ if (!i.totalhigh)
+ return 0;
+
+ page_pool = mempool_create_page_pool(POOL_SIZE, 0);
+ BUG_ON(!page_pool);
+ printk("highmem bounce pool size: %d pages\n", POOL_SIZE);
+
+ return 0;
+}
+
+__initcall(init_emergency_pool);
+
+/*
+ * highmem version, map in to vec
+ */
+static void bounce_copy_vec(struct bio_vec *to, unsigned char *vfrom)
+{
+ unsigned long flags;
+ unsigned char *vto;
+
+ local_irq_save(flags);
+ vto = kmap_atomic(to->bv_page, KM_BOUNCE_READ);
+ memcpy(vto + to->bv_offset, vfrom, to->bv_len);
+ kunmap_atomic(vto, KM_BOUNCE_READ);
+ local_irq_restore(flags);
+}
+
+#else /* CONFIG_HIGHMEM */
+
+#define bounce_copy_vec(to, vfrom) \
+ memcpy(page_address((to)->bv_page) + (to)->bv_offset, vfrom, (to)->bv_len)
+
+#endif /* CONFIG_HIGHMEM */
+
+/*
+ * allocate pages in the DMA region for the ISA pool
+ */
+static void *mempool_alloc_pages_isa(gfp_t gfp_mask, void *data)
+{
+ return mempool_alloc_pages(gfp_mask | GFP_DMA, data);
+}
+
+/*
+ * gets called "every" time someone init's a queue with BLK_BOUNCE_ISA
+ * as the max address, so check if the pool has already been created.
+ */
+int init_emergency_isa_pool(void)
+{
+ if (isa_page_pool)
+ return 0;
+
+ isa_page_pool = mempool_create(ISA_POOL_SIZE, mempool_alloc_pages_isa,
+ mempool_free_pages, (void *) 0);
+ BUG_ON(!isa_page_pool);
+
+ printk("isa bounce pool size: %d pages\n", ISA_POOL_SIZE);
+ return 0;
+}
+
+/*
+ * Simple bounce buffer support for highmem pages. Depending on the
+ * queue gfp mask set, *to may or may not be a highmem page. kmap it
+ * always, it will do the Right Thing
+ */
+static void copy_to_high_bio_irq(struct bio *to, struct bio *from)
+{
+ unsigned char *vfrom;
+ struct bio_vec *tovec, *fromvec;
+ int i;
+
+ __bio_for_each_segment(tovec, to, i, 0) {
+ fromvec = from->bi_io_vec + i;
+
+ /*
+ * not bounced
+ */
+ if (tovec->bv_page == fromvec->bv_page)
+ continue;
+
+ /*
+ * fromvec->bv_offset and fromvec->bv_len might have been
+ * modified by the block layer, so use the original copy,
+ * bounce_copy_vec already uses tovec->bv_len
+ */
+ vfrom = page_address(fromvec->bv_page) + tovec->bv_offset;
+
+ flush_dcache_page(tovec->bv_page);
+ bounce_copy_vec(tovec, vfrom);
+ }
+}
+
+static void bounce_end_io(struct bio *bio, mempool_t *pool, int err)
+{
+ struct bio *bio_orig = bio->bi_private;
+ struct bio_vec *bvec, *org_vec;
+ int i;
+
+ if (test_bit(BIO_EOPNOTSUPP, &bio->bi_flags))
+ set_bit(BIO_EOPNOTSUPP, &bio_orig->bi_flags);
+
+ /*
+ * free up bounce indirect pages used
+ */
+ __bio_for_each_segment(bvec, bio, i, 0) {
+ org_vec = bio_orig->bi_io_vec + i;
+ if (bvec->bv_page == org_vec->bv_page)
+ continue;
+
+ dec_zone_page_state(bvec->bv_page, NR_BOUNCE);
+ mempool_free(bvec->bv_page, pool);
+ }
+
+ bio_endio(bio_orig, bio_orig->bi_size, err);
+ bio_put(bio);
+}
+
+static int bounce_end_io_write(struct bio *bio, unsigned int bytes_done, int err)
+{
+ if (bio->bi_size)
+ return 1;
+
+ bounce_end_io(bio, page_pool, err);
+ return 0;
+}
+
+static int bounce_end_io_write_isa(struct bio *bio, unsigned int bytes_done, int err)
+{
+ if (bio->bi_size)
+ return 1;
+
+ bounce_end_io(bio, isa_page_pool, err);
+ return 0;
+}
+
+static void __bounce_end_io_read(struct bio *bio, mempool_t *pool, int err)
+{
+ struct bio *bio_orig = bio->bi_private;
+
+ if (test_bit(BIO_UPTODATE, &bio->bi_flags))
+ copy_to_high_bio_irq(bio_orig, bio);
+
+ bounce_end_io(bio, pool, err);
+}
+
+static int bounce_end_io_read(struct bio *bio, unsigned int bytes_done, int err)
+{
+ if (bio->bi_size)
+ return 1;
+
+ __bounce_end_io_read(bio, page_pool, err);
+ return 0;
+}
+
+static int bounce_end_io_read_isa(struct bio *bio, unsigned int bytes_done, int err)
+{
+ if (bio->bi_size)
+ return 1;
+
+ __bounce_end_io_read(bio, isa_page_pool, err);
+ return 0;
+}
+
+static void __blk_queue_bounce(request_queue_t *q, struct bio **bio_orig,
+ mempool_t *pool)
+{
+ struct page *page;
+ struct bio *bio = NULL;
+ int i, rw = bio_data_dir(*bio_orig);
+ struct bio_vec *to, *from;
+
+ bio_for_each_segment(from, *bio_orig, i) {
+ page = from->bv_page;
+
+ /*
+ * is destination page below bounce pfn?
+ */
+ if (page_to_pfn(page) < q->bounce_pfn)
+ continue;
+
+ /*
+ * irk, bounce it
+ */
+ if (!bio)
+ bio = bio_alloc(GFP_NOIO, (*bio_orig)->bi_vcnt);
+
+ to = bio->bi_io_vec + i;
+
+ to->bv_page = mempool_alloc(pool, q->bounce_gfp);
+ to->bv_len = from->bv_len;
+ to->bv_offset = from->bv_offset;
+ inc_zone_page_state(to->bv_page, NR_BOUNCE);
+
+ if (rw == WRITE) {
+ char *vto, *vfrom;
+
+ flush_dcache_page(from->bv_page);
+ vto = page_address(to->bv_page) + to->bv_offset;
+ vfrom = kmap(from->bv_page) + from->bv_offset;
+ memcpy(vto, vfrom, to->bv_len);
+ kunmap(from->bv_page);
+ }
+ }
+
+ /*
+ * no pages bounced
+ */
+ if (!bio)
+ return;
+
+ /*
+ * at least one page was bounced, fill in possible non-highmem
+ * pages
+ */
+ __bio_for_each_segment(from, *bio_orig, i, 0) {
+ to = bio_iovec_idx(bio, i);
+ if (!to->bv_page) {
+ to->bv_page = from->bv_page;
+ to->bv_len = from->bv_len;
+ to->bv_offset = from->bv_offset;
+ }
+ }
+
+ bio->bi_bdev = (*bio_orig)->bi_bdev;
+ bio->bi_flags |= (1 << BIO_BOUNCED);
+ bio->bi_sector = (*bio_orig)->bi_sector;
+ bio->bi_rw = (*bio_orig)->bi_rw;
+
+ bio->bi_vcnt = (*bio_orig)->bi_vcnt;
+ bio->bi_idx = (*bio_orig)->bi_idx;
+ bio->bi_size = (*bio_orig)->bi_size;
+
+ if (pool == page_pool) {
+ bio->bi_end_io = bounce_end_io_write;
+ if (rw == READ)
+ bio->bi_end_io = bounce_end_io_read;
+ } else {
+ bio->bi_end_io = bounce_end_io_write_isa;
+ if (rw == READ)
+ bio->bi_end_io = bounce_end_io_read_isa;
+ }
+
+ bio->bi_private = *bio_orig;
+ *bio_orig = bio;
+}
+
+void blk_queue_bounce(request_queue_t *q, struct bio **bio_orig)
+{
+ mempool_t *pool;
+
+ /*
+ * for non-isa bounce case, just check if the bounce pfn is equal
+ * to or bigger than the highest pfn in the system -- in that case,
+ * don't waste time iterating over bio segments
+ */
+ if (!(q->bounce_gfp & GFP_DMA)) {
+ if (q->bounce_pfn >= blk_max_pfn)
+ return;
+ pool = page_pool;
+ } else {
+ BUG_ON(!isa_page_pool);
+ pool = isa_page_pool;
+ }
+
+ blk_add_trace_bio(q, *bio_orig, BLK_TA_BOUNCE);
+
+ /*
+ * slow path
+ */
+ __blk_queue_bounce(q, bio_orig, pool);
+}
+
+EXPORT_SYMBOL(blk_queue_bounce);
diff --git a/mm/filemap.c b/mm/filemap.c
index b9a60c4..88d9cd1 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2003,6 +2003,7 @@ inline int generic_write_checks(struct f
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;
@@ -2014,6 +2015,9 @@ inline int generic_write_checks(struct f
if (*pos + *count > isize)
*count = isize - *pos;
+#else
+ return -EPERM;
+#endif
}
return 0;
}
@@ -2474,3 +2478,33 @@ generic_file_direct_IO(int rw, struct ki
}
return retval;
}
+
+/**
+ * try_to_release_page() - release old fs-specific metadata on a page
+ *
+ * @page: the page which the kernel is trying to free
+ * @gfp_mask: memory allocation flags (and I/O mode)
+ *
+ * The address_space is to try to release any data against the page
+ * (presumably at page->private). If the release was successful, return `1'.
+ * Otherwise return zero.
+ *
+ * The @gfp_mask argument specifies whether I/O may be performed to release
+ * this page (__GFP_IO), and whether the call may block (__GFP_WAIT).
+ *
+ * NOTE: @gfp_mask may go away, and this function may become non-blocking.
+ */
+int try_to_release_page(struct page *page, gfp_t gfp_mask)
+{
+ struct address_space * const mapping = page->mapping;
+
+ BUG_ON(!PageLocked(page));
+ if (PageWriteback(page))
+ return 0;
+
+ if (mapping && mapping->a_ops->releasepage)
+ return mapping->a_ops->releasepage(page, gfp_mask);
+ return try_to_free_buffers(page);
+}
+
+EXPORT_SYMBOL(try_to_release_page);
diff --git a/mm/highmem.c b/mm/highmem.c
index 9b2a540..1ac20d6 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -29,13 +29,6 @@ #include <linux/highmem.h>
#include <linux/blktrace_api.h>
#include <asm/tlbflush.h>
-static mempool_t *page_pool, *isa_page_pool;
-
-static void *mempool_alloc_pages_isa(gfp_t gfp_mask, void *data)
-{
- return mempool_alloc_pages(gfp_mask | GFP_DMA, data);
-}
-
/*
* Virtual_count is not a pure "count".
* 0 means that it is not mapped, and has not been mapped
@@ -204,282 +197,8 @@ void fastcall kunmap_high(struct page *p
}
EXPORT_SYMBOL(kunmap_high);
-
-#define POOL_SIZE 64
-
-static __init int init_emergency_pool(void)
-{
- struct sysinfo i;
- si_meminfo(&i);
- si_swapinfo(&i);
-
- if (!i.totalhigh)
- return 0;
-
- page_pool = mempool_create_page_pool(POOL_SIZE, 0);
- BUG_ON(!page_pool);
- printk("highmem bounce pool size: %d pages\n", POOL_SIZE);
-
- return 0;
-}
-
-__initcall(init_emergency_pool);
-
-/*
- * highmem version, map in to vec
- */
-static void bounce_copy_vec(struct bio_vec *to, unsigned char *vfrom)
-{
- unsigned long flags;
- unsigned char *vto;
-
- local_irq_save(flags);
- vto = kmap_atomic(to->bv_page, KM_BOUNCE_READ);
- memcpy(vto + to->bv_offset, vfrom, to->bv_len);
- kunmap_atomic(vto, KM_BOUNCE_READ);
- local_irq_restore(flags);
-}
-
-#else /* CONFIG_HIGHMEM */
-
-#define bounce_copy_vec(to, vfrom) \
- memcpy(page_address((to)->bv_page) + (to)->bv_offset, vfrom, (to)->bv_len)
-
#endif
-#define ISA_POOL_SIZE 16
-
-/*
- * gets called "every" time someone init's a queue with BLK_BOUNCE_ISA
- * as the max address, so check if the pool has already been created.
- */
-int init_emergency_isa_pool(void)
-{
- if (isa_page_pool)
- return 0;
-
- isa_page_pool = mempool_create(ISA_POOL_SIZE, mempool_alloc_pages_isa,
- mempool_free_pages, (void *) 0);
- BUG_ON(!isa_page_pool);
-
- printk("isa bounce pool size: %d pages\n", ISA_POOL_SIZE);
- return 0;
-}
-
-/*
- * Simple bounce buffer support for highmem pages. Depending on the
- * queue gfp mask set, *to may or may not be a highmem page. kmap it
- * always, it will do the Right Thing
- */
-static void copy_to_high_bio_irq(struct bio *to, struct bio *from)
-{
- unsigned char *vfrom;
- struct bio_vec *tovec, *fromvec;
- int i;
-
- __bio_for_each_segment(tovec, to, i, 0) {
- fromvec = from->bi_io_vec + i;
-
- /*
- * not bounced
- */
- if (tovec->bv_page == fromvec->bv_page)
- continue;
-
- /*
- * fromvec->bv_offset and fromvec->bv_len might have been
- * modified by the block layer, so use the original copy,
- * bounce_copy_vec already uses tovec->bv_len
- */
- vfrom = page_address(fromvec->bv_page) + tovec->bv_offset;
-
- flush_dcache_page(tovec->bv_page);
- bounce_copy_vec(tovec, vfrom);
- }
-}
-
-static void bounce_end_io(struct bio *bio, mempool_t *pool, int err)
-{
- struct bio *bio_orig = bio->bi_private;
- struct bio_vec *bvec, *org_vec;
- int i;
-
- if (test_bit(BIO_EOPNOTSUPP, &bio->bi_flags))
- set_bit(BIO_EOPNOTSUPP, &bio_orig->bi_flags);
-
- /*
- * free up bounce indirect pages used
- */
- __bio_for_each_segment(bvec, bio, i, 0) {
- org_vec = bio_orig->bi_io_vec + i;
- if (bvec->bv_page == org_vec->bv_page)
- continue;
-
- dec_zone_page_state(bvec->bv_page, NR_BOUNCE);
- mempool_free(bvec->bv_page, pool);
- }
-
- bio_endio(bio_orig, bio_orig->bi_size, err);
- bio_put(bio);
-}
-
-static int bounce_end_io_write(struct bio *bio, unsigned int bytes_done, int err)
-{
- if (bio->bi_size)
- return 1;
-
- bounce_end_io(bio, page_pool, err);
- return 0;
-}
-
-static int bounce_end_io_write_isa(struct bio *bio, unsigned int bytes_done, int err)
-{
- if (bio->bi_size)
- return 1;
-
- bounce_end_io(bio, isa_page_pool, err);
- return 0;
-}
-
-static void __bounce_end_io_read(struct bio *bio, mempool_t *pool, int err)
-{
- struct bio *bio_orig = bio->bi_private;
-
- if (test_bit(BIO_UPTODATE, &bio->bi_flags))
- copy_to_high_bio_irq(bio_orig, bio);
-
- bounce_end_io(bio, pool, err);
-}
-
-static int bounce_end_io_read(struct bio *bio, unsigned int bytes_done, int err)
-{
- if (bio->bi_size)
- return 1;
-
- __bounce_end_io_read(bio, page_pool, err);
- return 0;
-}
-
-static int bounce_end_io_read_isa(struct bio *bio, unsigned int bytes_done, int err)
-{
- if (bio->bi_size)
- return 1;
-
- __bounce_end_io_read(bio, isa_page_pool, err);
- return 0;
-}
-
-static void __blk_queue_bounce(request_queue_t *q, struct bio **bio_orig,
- mempool_t *pool)
-{
- struct page *page;
- struct bio *bio = NULL;
- int i, rw = bio_data_dir(*bio_orig);
- struct bio_vec *to, *from;
-
- bio_for_each_segment(from, *bio_orig, i) {
- page = from->bv_page;
-
- /*
- * is destination page below bounce pfn?
- */
- if (page_to_pfn(page) < q->bounce_pfn)
- continue;
-
- /*
- * irk, bounce it
- */
- if (!bio)
- bio = bio_alloc(GFP_NOIO, (*bio_orig)->bi_vcnt);
-
- to = bio->bi_io_vec + i;
-
- to->bv_page = mempool_alloc(pool, q->bounce_gfp);
- to->bv_len = from->bv_len;
- to->bv_offset = from->bv_offset;
- inc_zone_page_state(to->bv_page, NR_BOUNCE);
-
- if (rw == WRITE) {
- char *vto, *vfrom;
-
- flush_dcache_page(from->bv_page);
- vto = page_address(to->bv_page) + to->bv_offset;
- vfrom = kmap(from->bv_page) + from->bv_offset;
- memcpy(vto, vfrom, to->bv_len);
- kunmap(from->bv_page);
- }
- }
-
- /*
- * no pages bounced
- */
- if (!bio)
- return;
-
- /*
- * at least one page was bounced, fill in possible non-highmem
- * pages
- */
- __bio_for_each_segment(from, *bio_orig, i, 0) {
- to = bio_iovec_idx(bio, i);
- if (!to->bv_page) {
- to->bv_page = from->bv_page;
- to->bv_len = from->bv_len;
- to->bv_offset = from->bv_offset;
- }
- }
-
- bio->bi_bdev = (*bio_orig)->bi_bdev;
- bio->bi_flags |= (1 << BIO_BOUNCED);
- bio->bi_sector = (*bio_orig)->bi_sector;
- bio->bi_rw = (*bio_orig)->bi_rw;
-
- bio->bi_vcnt = (*bio_orig)->bi_vcnt;
- bio->bi_idx = (*bio_orig)->bi_idx;
- bio->bi_size = (*bio_orig)->bi_size;
-
- if (pool == page_pool) {
- bio->bi_end_io = bounce_end_io_write;
- if (rw == READ)
- bio->bi_end_io = bounce_end_io_read;
- } else {
- bio->bi_end_io = bounce_end_io_write_isa;
- if (rw == READ)
- bio->bi_end_io = bounce_end_io_read_isa;
- }
-
- bio->bi_private = *bio_orig;
- *bio_orig = bio;
-}
-
-void blk_queue_bounce(request_queue_t *q, struct bio **bio_orig)
-{
- mempool_t *pool;
-
- /*
- * for non-isa bounce case, just check if the bounce pfn is equal
- * to or bigger than the highest pfn in the system -- in that case,
- * don't waste time iterating over bio segments
- */
- if (!(q->bounce_gfp & GFP_DMA)) {
- if (q->bounce_pfn >= blk_max_pfn)
- return;
- pool = page_pool;
- } else {
- BUG_ON(!isa_page_pool);
- pool = isa_page_pool;
- }
-
- blk_add_trace_bio(q, *bio_orig, BLK_TA_BOUNCE);
-
- /*
- * slow path
- */
- __blk_queue_bounce(q, bio_orig, pool);
-}
-
-EXPORT_SYMBOL(blk_queue_bounce);
-
#if defined(HASHED_PAGE_VIRTUAL)
#define PA_HASH_ORDER 7
diff --git a/mm/migrate.c b/mm/migrate.c
index 3f1e0c2..bedc0ed 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -409,6 +409,7 @@ int migrate_page(struct address_space *m
}
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_s
return 0;
}
EXPORT_SYMBOL(buffer_migrate_page);
+#endif
/*
* Writeback a page to clean the dirty state
@@ -525,7 +527,7 @@ static int fallback_migrate_page(struct
* Buffers may be managed in a filesystem specific way.
* We must have no buffers or drop them.
*/
- if (page_has_buffers(page) &&
+ if (PagePrivate(page) &&
!try_to_release_page(page, GFP_KERNEL))
return -EAGAIN;
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index e630188..e2cc3af 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -29,6 +29,7 @@ #include <linux/smp.h>
#include <linux/sysctl.h>
#include <linux/cpu.h>
#include <linux/syscalls.h>
+#include <linux/buffer_head.h>
/*
* The maximum number of pages to writeout in a single bdflush/kupdate
@@ -664,9 +665,11 @@ int fastcall set_page_dirty(struct 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))
diff --git a/mm/truncate.c b/mm/truncate.c
index cf1b015..081437d 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -16,6 +16,32 @@ #include <linux/buffer_head.h> /* grr. t
do_invalidatepage */
+/**
+ * do_invalidatepage - invalidate part of all of a page
+ * @page: the page which is affected
+ * @offset: the index of the truncation point
+ *
+ * do_invalidatepage() is called when all or part of the page has become
+ * invalidated by a truncate operation.
+ *
+ * do_invalidatepage() does not have to release all buffers, but it must
+ * ensure that no dirty buffer is left outside @offset and that no I/O
+ * is underway against any of the blocks which are outside the truncation
+ * point. Because the caller is about to free (and possibly reuse) those
+ * blocks on-disk.
+ */
+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);
+}
+
static inline void truncate_partial_page(struct page *page, unsigned partial)
{
memclear_highpage_flush(page, partial, PAGE_CACHE_SIZE-partial);
diff --git a/security/seclvl.c b/security/seclvl.c
index c26dd7d..fc00df2 100644
--- a/security/seclvl.c
+++ b/security/seclvl.c
@@ -377,6 +377,7 @@ static int seclvl_settime(struct timespe
/* claim the blockdev to exclude mounters, release on file close */
static int seclvl_bd_claim(struct inode *inode)
{
+#ifdef CONFIG_BLOCK
int holder;
struct block_device *bdev = NULL;
dev_t dev = inode->i_rdev;
@@ -389,12 +390,14 @@ static int seclvl_bd_claim(struct inode
/* claimed, mark it to release on close */
inode->i_security = current;
}
+#endif
return 0;
}
/* release the blockdev if you claimed it */
static void seclvl_bd_release(struct inode *inode)
{
+#ifdef CONFIG_BLOCK
if (inode && S_ISBLK(inode->i_mode) && inode->i_security == current) {
struct block_device *bdev = inode->i_bdev;
if (bdev) {
@@ -403,6 +406,7 @@ static void seclvl_bd_release(struct ino
inode->i_security = NULL;
}
}
+#endif
}
/**
-
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