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David Howells 9361401eb7 [PATCH] BLOCK: Make it possible to disable the block layer [try #6] 
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>
2006-09-30 20:52:31 +02:00
..
linux-2.6 [XFS] pv 956240, author: nathans, rv: vapo - Minor fixes in 2006-09-28 11:06:10 +10:00
quota [XFS] Fix kmem_zalloc_greedy warnings on 64 bit platforms. 2006-09-28 11:04:43 +10:00
support [XFS] Add a debug flag for allocations which are known to be larger than 2006-09-28 11:03:05 +10:00
Kbuild kbuild/xfs: introduce fs/xfs/Kbuild 2006-01-09 20:48:03 +01:00
Kconfig [PATCH] BLOCK: Make it possible to disable the block layer [try #6] 2006-09-30 20:52:31 +02:00
Makefile [XFS] Sort out some cosmetic differences between XFS trees. 2005-09-05 11:47:01 +10:00
Makefile-linux-2.6 [XFS] Remove v1 dir trace macro - missed in a past commit. 2006-09-29 15:23:02 +10:00
xfs.h [PATCH] changing CONFIG_LOCALVERSION rebuilds too much, for no good reason 2005-11-09 07:55:57 -08:00
xfs_acl.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_acl.h [XFS] Resolve a namespace collision on remaining vtypes for FreeBSD 2006-06-09 17:07:12 +10:00
xfs_ag.h [XFS] endianess annotation for xfs_agfl_t. Trivial, xfs_agfl_t is always 2006-09-28 10:56:51 +10:00
xfs_alloc.c [XFS] Minor code rearranging and cleanup to prevent some coverity false 2006-09-28 11:03:44 +10:00
xfs_alloc.h [XFS] Prevent free space oversubscription and xfssyncd looping. 2006-09-07 14:26:50 +10:00
xfs_alloc_btree.c [XFS] Reduce endian flipping in alloc_btree, same as was done for 2006-09-28 11:05:40 +10:00
xfs_alloc_btree.h [XFS] Endianess annotations for various allocator data structures 2005-11-02 15:11:25 +11:00
xfs_arch.h [XFS] Merge in trivial changes, sync up headers with userspace 2006-01-12 10:29:53 +11:00
xfs_attr.c [XFS] Add EA list callbacks for xfs kernel use. Cleanup some namespace 2006-09-28 11:01:37 +10:00
xfs_attr.h [XFS] Add EA list callbacks for xfs kernel use. Cleanup some namespace 2006-09-28 11:01:37 +10:00
xfs_attr_leaf.c [XFS] Add EA list callbacks for xfs kernel use. Cleanup some namespace 2006-09-28 11:01:37 +10:00
xfs_attr_leaf.h [XFS] Add EA list callbacks for xfs kernel use. Cleanup some namespace 2006-09-28 11:01:37 +10:00
xfs_attr_sf.h [XFS] endianess annotations for xfs_attr_shortform_t 2006-03-17 17:29:25 +11:00
xfs_behavior.c [XFS] remove bhv_lookup, _range version works aswell and has more useful 2006-09-28 10:58:52 +10:00
xfs_behavior.h [XFS] remove bhv_lookup, _range version works aswell and has more useful 2006-09-28 10:58:52 +10:00
xfs_bit.c [XFS] Update license/copyright notices to match the prefered SGI 2005-11-02 14:58:39 +11:00
xfs_bit.h [XFS] Update license/copyright notices to match the prefered SGI 2005-11-02 14:58:39 +11:00
xfs_bmap.c [XFS] Improve error handling for the zero-fsblock extent detection code. 2006-09-28 11:03:20 +10:00
xfs_bmap.h [XFS] Add parameters to xfs_bmapi() and xfs_bunmapi() to have them report 2006-06-09 14:48:12 +10:00
xfs_bmap_btree.c [XFS] use NULL for pointer initialisation instead of zero-cast-to-ptr 2006-09-28 10:58:40 +10:00
xfs_bmap_btree.h [XFS] endianess annotations for xfs_bmbt_key Trivial as there are no 2006-09-28 10:58:17 +10:00
xfs_btree.c [XFS] endianess annotations for xfs_bmbt_key Trivial as there are no 2006-09-28 10:58:17 +10:00
xfs_btree.h [XFS] endianess annotate XFS_BMAP_BROOT_PTR_ADDR Make sure it returns a 2006-09-28 10:58:06 +10:00
xfs_buf_item.c [XFS] Remove unused iop_abort log item operation 2006-09-28 11:02:44 +10:00
xfs_buf_item.h [XFS] Update license/copyright notices to match the prefered SGI 2005-11-02 14:58:39 +11:00
xfs_cap.h [XFS] Resolve a namespace collision on vnode/vnodeops for FreeBSD porters. 2006-06-09 17:00:52 +10:00
xfs_clnt.h [XFS] Implement the silent parameter to fill_super, previously ignored. 2006-03-31 13:04:17 +10:00
xfs_da_btree.c [XFS] Minor code rearranging and cleanup to prevent some coverity false 2006-09-28 11:03:44 +10:00
xfs_da_btree.h [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_dfrag.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_dfrag.h [XFS] Add parameters to xfs_bmapi() and xfs_bunmapi() to have them report 2006-06-09 14:48:12 +10:00
xfs_dinode.h [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_dir2.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_dir2.h [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_dir2_block.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_dir2_block.h [XFS] endianess annotations for xfs_dir2_block_tail_t 2006-03-17 17:27:56 +11:00
xfs_dir2_data.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_dir2_data.h [XFS] endianess annotations for xfs_dir2_data_entry_t 2006-06-09 14:48:37 +10:00
xfs_dir2_leaf.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_dir2_leaf.h [XFS] endianess annotations for xfs_dir2_leaf_entry_t 2006-03-17 17:28:18 +11:00
xfs_dir2_node.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_dir2_node.h [XFS] endianess annotations for xfs_dir2_free_hdr_t 2006-03-17 17:27:07 +11:00
xfs_dir2_sf.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_dir2_sf.h [XFS] Update license/copyright notices to match the prefered SGI 2005-11-02 14:58:39 +11:00
xfs_dir2_trace.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_dir2_trace.h [XFS] Update license/copyright notices to match the prefered SGI 2005-11-02 14:58:39 +11:00
xfs_dmapi.h [XFS] Resolve a namespace collision on vfs/vfsops for FreeBSD porters. 2006-06-09 16:48:30 +10:00
xfs_dmops.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_error.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_error.h [XFS] Improve error handling for the zero-fsblock extent detection code. 2006-09-28 11:03:20 +10:00
xfs_extfree_item.c [XFS] Remove unused iop_abort log item operation 2006-09-28 11:02:44 +10:00
xfs_extfree_item.h [XFS] cleanup the field types of some item format structures 2006-09-28 10:55:43 +10:00
xfs_fs.h [XFS] Remove several macros that are no longer used anywhere 2006-09-28 11:02:57 +10:00
xfs_fsops.c [XFS] Prevent free space oversubscription and xfssyncd looping. 2006-09-07 14:26:50 +10:00
xfs_fsops.h [XFS] Write log dummy record when freezing filesystem 2006-01-11 15:30:08 +11:00
xfs_ialloc.c [XFS] Remove last bulkstat false-positives with debug kernels. 2006-09-28 11:02:23 +10:00
xfs_ialloc.h [XFS] Update license/copyright notices to match the prefered SGI 2005-11-02 14:58:39 +11:00
xfs_ialloc_btree.c [XFS] use NULL for pointer initialisation instead of zero-cast-to-ptr 2006-09-28 10:58:40 +10:00
xfs_ialloc_btree.h [XFS] endianess annotations for xfs_inobt_rec_t / xfs_inobt_key_t 2006-09-28 10:57:04 +10:00
xfs_iget.c [XFS] Really fix use after free in xfs_iunpin. 2006-09-28 11:06:03 +10:00
xfs_imap.h [XFS] Update license/copyright notices to match the prefered SGI 2005-11-02 14:58:39 +11:00
xfs_inode.c [XFS] Really fix use after free in xfs_iunpin. 2006-09-28 11:06:03 +10:00
xfs_inode.h [XFS] Really fix use after free in xfs_iunpin. 2006-09-28 11:06:03 +10:00
xfs_inode_item.c [XFS] Remove unused iop_abort log item operation 2006-09-28 11:02:44 +10:00
xfs_inode_item.h [XFS] cleanup the field types of some item format structures 2006-09-28 10:55:43 +10:00
xfs_inum.h [XFS] Update license/copyright notices to match the prefered SGI 2005-11-02 14:58:39 +11:00
xfs_iocore.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_iomap.c [XFS] Improve error handling for the zero-fsblock extent detection code. 2006-09-28 11:03:20 +10:00
xfs_iomap.h [XFS] Fix potential overflow in xfs_iomap_t delta for very large extents 2005-11-25 16:41:33 +11:00
xfs_itable.c [XFS] 955947: Infinite loop in xfs_bulkstat() on formatter() error 2006-09-28 11:06:21 +10:00
xfs_itable.h [XFS] pv 956241, author: nathans, rv: vapo - make ino validation checks 2006-09-28 11:06:15 +10:00
xfs_log.c [XFS] Fixes the leak in reservation space because we weren't ungranting 2006-09-28 11:04:16 +10:00
xfs_log.h [XFS] Remove several macros that are no longer used anywhere 2006-09-28 11:02:57 +10:00
xfs_log_priv.h [XFS] Fixes the leak in reservation space because we weren't ungranting 2006-09-28 11:04:16 +10:00
xfs_log_recover.c [XFS] Rework code snippets slightly to remove remaining recent-gcc 2006-06-28 10:13:52 +10:00
xfs_log_recover.h [XFS] Update license/copyright notices to match the prefered SGI 2005-11-02 14:58:39 +11:00
xfs_mac.h [XFS] Update license/copyright notices to match the prefered SGI 2005-11-02 14:58:39 +11:00
xfs_mount.c [XFS] Prevent free space oversubscription and xfssyncd looping. 2006-09-07 14:26:50 +10:00
xfs_mount.h [XFS] Fix kmem_zalloc_greedy warnings on 64 bit platforms. 2006-09-28 11:04:43 +10:00
xfs_qmops.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_quota.h [XFS] Remove several macros that are no longer used anywhere 2006-09-28 11:02:57 +10:00
xfs_refcache.h [XFS] Cleanup cosmetic differences between source trees. 2005-11-03 16:14:31 +11:00
xfs_rename.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_rtalloc.c [XFS] Fix a porting botch on the realtime subvol growfs code path. 2006-09-28 11:03:53 +10:00
xfs_rtalloc.h [XFS] Update license/copyright notices to match the prefered SGI 2005-11-02 14:58:39 +11:00
xfs_rw.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_rw.h [XFS] Push some common code out of write path into core XFS code for 2006-06-19 08:39:53 +10:00
xfs_sb.h [XFS] Remove several macros that are no longer used anywhere 2006-09-28 11:02:57 +10:00
xfs_trans.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_trans.h [XFS] Remove unused iop_abort log item operation 2006-09-28 11:02:44 +10:00
xfs_trans_ail.c [XFS] Add lock annotations to xfs_trans_update_ail and 2006-09-28 11:04:07 +10:00
xfs_trans_buf.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_trans_extfree.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_trans_inode.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_trans_item.c [XFS] Portability changes: remove prdev, stick to one diagnostic 2006-06-09 15:29:40 +10:00
xfs_trans_priv.h [XFS] Add lock annotations to xfs_trans_update_ail and 2006-09-28 11:04:07 +10:00
xfs_trans_space.h [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_types.h [XFS] Update license/copyright notices to match the prefered SGI 2005-11-02 14:58:39 +11:00
xfs_utils.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_utils.h [XFS] Resolve a namespace collision on remaining vtypes for FreeBSD 2006-06-09 17:07:12 +10:00
xfs_vfsops.c [XFS] Fix kmem_zalloc_greedy warnings on 64 bit platforms. 2006-09-28 11:04:43 +10:00
xfs_vnodeops.c [XFS] Really fix use after free in xfs_iunpin. 2006-09-28 11:06:03 +10:00