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9361401eb7
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>
111 lines
3.4 KiB
Makefile
111 lines
3.4 KiB
Makefile
#
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# Makefile for the Linux filesystems.
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#
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# 14 Sep 2000, Christoph Hellwig <hch@infradead.org>
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# Rewritten to use lists instead of if-statements.
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#
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obj-y := open.o read_write.o file_table.o super.o \
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char_dev.o stat.o exec.o pipe.o namei.o fcntl.o \
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ioctl.o readdir.o select.o fifo.o locks.o dcache.o inode.o \
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attr.o bad_inode.o file.o filesystems.o namespace.o aio.o \
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seq_file.o xattr.o libfs.o fs-writeback.o \
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pnode.o drop_caches.o splice.o sync.o
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ifeq ($(CONFIG_BLOCK),y)
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obj-y += buffer.o bio.o block_dev.o direct-io.o mpage.o ioprio.o
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else
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obj-y += no-block.o
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endif
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obj-$(CONFIG_INOTIFY) += inotify.o
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obj-$(CONFIG_INOTIFY_USER) += inotify_user.o
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obj-$(CONFIG_EPOLL) += eventpoll.o
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obj-$(CONFIG_COMPAT) += compat.o compat_ioctl.o
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nfsd-$(CONFIG_NFSD) := nfsctl.o
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obj-y += $(nfsd-y) $(nfsd-m)
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obj-$(CONFIG_BINFMT_AOUT) += binfmt_aout.o
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obj-$(CONFIG_BINFMT_EM86) += binfmt_em86.o
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obj-$(CONFIG_BINFMT_MISC) += binfmt_misc.o
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# binfmt_script is always there
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obj-y += binfmt_script.o
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obj-$(CONFIG_BINFMT_ELF) += binfmt_elf.o
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obj-$(CONFIG_BINFMT_ELF_FDPIC) += binfmt_elf_fdpic.o
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obj-$(CONFIG_BINFMT_SOM) += binfmt_som.o
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obj-$(CONFIG_BINFMT_FLAT) += binfmt_flat.o
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obj-$(CONFIG_FS_MBCACHE) += mbcache.o
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obj-$(CONFIG_FS_POSIX_ACL) += posix_acl.o xattr_acl.o
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obj-$(CONFIG_NFS_COMMON) += nfs_common/
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obj-$(CONFIG_GENERIC_ACL) += generic_acl.o
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obj-$(CONFIG_QUOTA) += dquot.o
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obj-$(CONFIG_QFMT_V1) += quota_v1.o
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obj-$(CONFIG_QFMT_V2) += quota_v2.o
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obj-$(CONFIG_QUOTACTL) += quota.o
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obj-$(CONFIG_DNOTIFY) += dnotify.o
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obj-$(CONFIG_PROC_FS) += proc/
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obj-y += partitions/
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obj-$(CONFIG_SYSFS) += sysfs/
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obj-$(CONFIG_CONFIGFS_FS) += configfs/
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obj-y += devpts/
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obj-$(CONFIG_PROFILING) += dcookies.o
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# Do not add any filesystems before this line
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obj-$(CONFIG_REISERFS_FS) += reiserfs/
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obj-$(CONFIG_EXT3_FS) += ext3/ # Before ext2 so root fs can be ext3
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obj-$(CONFIG_JBD) += jbd/
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obj-$(CONFIG_EXT2_FS) += ext2/
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obj-$(CONFIG_CRAMFS) += cramfs/
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obj-$(CONFIG_RAMFS) += ramfs/
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obj-$(CONFIG_HUGETLBFS) += hugetlbfs/
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obj-$(CONFIG_CODA_FS) += coda/
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obj-$(CONFIG_MINIX_FS) += minix/
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obj-$(CONFIG_FAT_FS) += fat/
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obj-$(CONFIG_MSDOS_FS) += msdos/
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obj-$(CONFIG_VFAT_FS) += vfat/
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obj-$(CONFIG_BFS_FS) += bfs/
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obj-$(CONFIG_ISO9660_FS) += isofs/
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obj-$(CONFIG_HFSPLUS_FS) += hfsplus/ # Before hfs to find wrapped HFS+
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obj-$(CONFIG_HFS_FS) += hfs/
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obj-$(CONFIG_VXFS_FS) += freevxfs/
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obj-$(CONFIG_NFS_FS) += nfs/
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obj-$(CONFIG_EXPORTFS) += exportfs/
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obj-$(CONFIG_NFSD) += nfsd/
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obj-$(CONFIG_LOCKD) += lockd/
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obj-$(CONFIG_NLS) += nls/
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obj-$(CONFIG_SYSV_FS) += sysv/
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obj-$(CONFIG_SMB_FS) += smbfs/
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obj-$(CONFIG_CIFS) += cifs/
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obj-$(CONFIG_NCP_FS) += ncpfs/
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obj-$(CONFIG_HPFS_FS) += hpfs/
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obj-$(CONFIG_NTFS_FS) += ntfs/
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obj-$(CONFIG_UFS_FS) += ufs/
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obj-$(CONFIG_EFS_FS) += efs/
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obj-$(CONFIG_JFFS_FS) += jffs/
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obj-$(CONFIG_JFFS2_FS) += jffs2/
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obj-$(CONFIG_AFFS_FS) += affs/
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obj-$(CONFIG_ROMFS_FS) += romfs/
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obj-$(CONFIG_QNX4FS_FS) += qnx4/
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obj-$(CONFIG_AUTOFS_FS) += autofs/
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obj-$(CONFIG_AUTOFS4_FS) += autofs4/
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obj-$(CONFIG_ADFS_FS) += adfs/
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obj-$(CONFIG_FUSE_FS) += fuse/
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obj-$(CONFIG_UDF_FS) += udf/
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obj-$(CONFIG_SUN_OPENPROMFS) += openpromfs/
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obj-$(CONFIG_JFS_FS) += jfs/
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obj-$(CONFIG_XFS_FS) += xfs/
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obj-$(CONFIG_9P_FS) += 9p/
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obj-$(CONFIG_AFS_FS) += afs/
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obj-$(CONFIG_BEFS_FS) += befs/
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obj-$(CONFIG_HOSTFS) += hostfs/
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obj-$(CONFIG_HPPFS) += hppfs/
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obj-$(CONFIG_DEBUG_FS) += debugfs/
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obj-$(CONFIG_OCFS2_FS) += ocfs2/
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