xfs: stop using the page cache to back the buffer cache (0e6e847f) · Commits · 戴 / test

fs/xfs/linux-2.6/xfs_buf.c

+80 −261

Original line number	Diff line number	Diff line
		@@ -93,75 +93,6 @@ xfs_buf_vmap_len(
		return (bp->b_page_count * PAGE_SIZE) - bp->b_offset;
		}

		/*
		* Page Region interfaces.
		*
		* For pages in filesystems where the blocksize is smaller than the
		* pagesize, we use the page->private field (long) to hold a bitmap
		* of uptodate regions within the page.
		*
		* Each such region is "bytes per page / bits per long" bytes long.
		*
		* NBPPR == number-of-bytes-per-page-region
		* BTOPR == bytes-to-page-region (rounded up)
		* BTOPRT == bytes-to-page-region-truncated (rounded down)
		*/
		#if (BITS_PER_LONG == 32)
		#define PRSHIFT (PAGE_CACHE_SHIFT - 5) /* (32 == 1<<5) */
		#elif (BITS_PER_LONG == 64)
		#define PRSHIFT (PAGE_CACHE_SHIFT - 6) /* (64 == 1<<6) */
		#else
		#error BITS_PER_LONG must be 32 or 64
		#endif
		#define NBPPR (PAGE_CACHE_SIZE/BITS_PER_LONG)
		#define BTOPR(b) (((unsigned int)(b) + (NBPPR - 1)) >> PRSHIFT)
		#define BTOPRT(b) (((unsigned int)(b) >> PRSHIFT))

		STATIC unsigned long
		page_region_mask(
		size_t offset,
		size_t length)
		{
		unsigned long mask;
		int first, final;

		first = BTOPR(offset);
		final = BTOPRT(offset + length - 1);
		first = min(first, final);

		mask = ~0UL;
		mask <<= BITS_PER_LONG - (final - first);
		mask >>= BITS_PER_LONG - (final);

		ASSERT(offset + length <= PAGE_CACHE_SIZE);
		ASSERT((final - first) < BITS_PER_LONG && (final - first) >= 0);

		return mask;
		}

		STATIC void
		set_page_region(
		struct page *page,
		size_t offset,
		size_t length)
		{
		set_page_private(page,
		page_private(page) \| page_region_mask(offset, length));
		if (page_private(page) == ~0UL)
		SetPageUptodate(page);
		}

		STATIC int
		test_page_region(
		struct page *page,
		size_t offset,
		size_t length)
		{
		unsigned long mask = page_region_mask(offset, length);

		return (mask && (page_private(page) & mask) == mask);
		}

		/*
		* xfs_buf_lru_add - add a buffer to the LRU.
		*
		@@ -332,7 +263,7 @@ xfs_buf_free(

		ASSERT(list_empty(&bp->b_lru));

		if (bp->b_flags & (_XBF_PAGE_CACHE\|_XBF_PAGES)) {
		if (bp->b_flags & _XBF_PAGES) {
		uint i;

		if (xfs_buf_is_vmapped(bp))
		@@ -342,25 +273,22 @@ xfs_buf_free(
		for (i = 0; i < bp->b_page_count; i++) {
		struct page *page = bp->b_pages[i];

		if (bp->b_flags & _XBF_PAGE_CACHE)
		ASSERT(!PagePrivate(page));
		page_cache_release(page);
		}
		__free_page(page);
		}
		} else if (bp->b_flags & _XBF_KMEM)
		kmem_free(bp->b_addr);
		_xfs_buf_free_pages(bp);
		xfs_buf_deallocate(bp);
		}

		/*
		* Finds all pages for buffer in question and builds it's page list.
		* Allocates all the pages for buffer in question and builds it's page list.
		*/
		STATIC int
		_xfs_buf_lookup_pages(
		xfs_buf_allocate_memory(
		xfs_buf_t *bp,
		uint flags)
		{
		struct address_space *mapping = bp->b_target->bt_mapping;
		size_t blocksize = bp->b_target->bt_bsize;
		size_t size = bp->b_count_desired;
		size_t nbytes, offset;
		gfp_t gfp_mask = xb_to_gfp(flags);
		@@ -369,29 +297,55 @@ _xfs_buf_lookup_pages(
		xfs_off_t end;
		int error;

		/*
		* for buffers that are contained within a single page, just allocate
		* the memory from the heap - there's no need for the complexity of
		* page arrays to keep allocation down to order 0.
		*/
		if (bp->b_buffer_length < PAGE_SIZE) {
		bp->b_addr = kmem_alloc(bp->b_buffer_length, xb_to_km(flags));
		if (!bp->b_addr) {
		/* low memory - use alloc_page loop instead */
		goto use_alloc_page;
		}

		if (((unsigned long)(bp->b_addr + bp->b_buffer_length - 1) &
		PAGE_MASK) !=
		((unsigned long)bp->b_addr & PAGE_MASK)) {
		/* b_addr spans two pages - use alloc_page instead */
		kmem_free(bp->b_addr);
		bp->b_addr = NULL;
		goto use_alloc_page;
		}
		bp->b_offset = offset_in_page(bp->b_addr);
		bp->b_pages = bp->b_page_array;
		bp->b_pages[0] = virt_to_page(bp->b_addr);
		bp->b_page_count = 1;
		bp->b_flags \|= XBF_MAPPED \| _XBF_KMEM;
		return 0;
		}

		use_alloc_page:
		end = bp->b_file_offset + bp->b_buffer_length;
		page_count = xfs_buf_btoc(end) - xfs_buf_btoct(bp->b_file_offset);

		error = _xfs_buf_get_pages(bp, page_count, flags);
		if (unlikely(error))
		return error;
		bp->b_flags \|= _XBF_PAGE_CACHE;

		offset = bp->b_offset;
		first = bp->b_file_offset >> PAGE_CACHE_SHIFT;
		first = bp->b_file_offset >> PAGE_SHIFT;
		bp->b_flags \|= _XBF_PAGES;

		for (i = 0; i < bp->b_page_count; i++) {
		struct page *page;
		uint retries = 0;

		retry:
		page = find_or_create_page(mapping, first + i, gfp_mask);
		page = alloc_page(gfp_mask);
		if (unlikely(page == NULL)) {
		if (flags & XBF_READ_AHEAD) {
		bp->b_page_count = i;
		for (i = 0; i < bp->b_page_count; i++)
		unlock_page(bp->b_pages[i]);
		return -ENOMEM;
		error = ENOMEM;
		goto out_free_pages;
		}

		/*
		@@ -412,33 +366,16 @@ _xfs_buf_lookup_pages(

		XFS_STATS_INC(xb_page_found);

		nbytes = min_t(size_t, size, PAGE_CACHE_SIZE - offset);
		nbytes = min_t(size_t, size, PAGE_SIZE - offset);
		size -= nbytes;

		ASSERT(!PagePrivate(page));
		if (!PageUptodate(page)) {
		page_count--;
		if (blocksize >= PAGE_CACHE_SIZE) {
		if (flags & XBF_READ)
		bp->b_flags \|= _XBF_PAGE_LOCKED;
		} else if (!PagePrivate(page)) {
		if (test_page_region(page, offset, nbytes))
		page_count++;
		}
		}

		bp->b_pages[i] = page;
		offset = 0;
		}
		return 0;

		if (!(bp->b_flags & _XBF_PAGE_LOCKED)) {
		out_free_pages:
		for (i = 0; i < bp->b_page_count; i++)
		unlock_page(bp->b_pages[i]);
		}

		if (page_count == bp->b_page_count)
		bp->b_flags \|= XBF_DONE;

		__free_page(bp->b_pages[i]);
		return error;
		}

		@@ -450,8 +387,9 @@ _xfs_buf_map_pages(
		xfs_buf_t *bp,
		uint flags)
		{
		/* A single page buffer is always mappable */
		ASSERT(bp->b_flags & _XBF_PAGES);
		if (bp->b_page_count == 1) {
		/* A single page buffer is always mappable */
		bp->b_addr = page_address(bp->b_pages[0]) + bp->b_offset;
		bp->b_flags \|= XBF_MAPPED;
		} else if (flags & XBF_MAPPED) {
		@@ -576,9 +514,14 @@ found:
		}
		}

		/*
		* if the buffer is stale, clear all the external state associated with
		* it. We need to keep flags such as how we allocated the buffer memory
		* intact here.
		*/
		if (bp->b_flags & XBF_STALE) {
		ASSERT((bp->b_flags & _XBF_DELWRI_Q) == 0);
		bp->b_flags &= XBF_MAPPED;
		bp->b_flags &= XBF_MAPPED \| _XBF_KMEM \| _XBF_PAGES;
		}

		trace_xfs_buf_find(bp, flags, _RET_IP_);
		@@ -599,7 +542,7 @@ xfs_buf_get(
		xfs_buf_flags_t flags)
		{
		xfs_buf_t bp, new_bp;
		int error = 0, i;
		int error = 0;

		new_bp = xfs_buf_allocate(flags);
		if (unlikely(!new_bp))
		@@ -607,7 +550,7 @@ xfs_buf_get(

		bp = _xfs_buf_find(target, ioff, isize, flags, new_bp);
		if (bp == new_bp) {
		error = _xfs_buf_lookup_pages(bp, flags);
		error = xfs_buf_allocate_memory(bp, flags);
		if (error)
		goto no_buffer;
		} else {
		@@ -616,9 +559,6 @@ xfs_buf_get(
		return NULL;
		}

		for (i = 0; i < bp->b_page_count; i++)
		mark_page_accessed(bp->b_pages[i]);

		if (!(bp->b_flags & XBF_MAPPED)) {
		error = _xfs_buf_map_pages(bp, flags);
		if (unlikely(error)) {
		@@ -719,8 +659,7 @@ xfs_buf_readahead(
		{
		struct backing_dev_info *bdi;

		bdi = target->bt_mapping->backing_dev_info;
		if (bdi_read_congested(bdi))
		if (bdi_read_congested(target->bt_bdi))
		return;

		xfs_buf_read(target, ioff, isize,
		@@ -798,10 +737,10 @@ xfs_buf_associate_memory(
		size_t buflen;
		int page_count;

		pageaddr = (unsigned long)mem & PAGE_CACHE_MASK;
		pageaddr = (unsigned long)mem & PAGE_MASK;
		offset = (unsigned long)mem - pageaddr;
		buflen = PAGE_CACHE_ALIGN(len + offset);
		page_count = buflen >> PAGE_CACHE_SHIFT;
		buflen = PAGE_ALIGN(len + offset);
		page_count = buflen >> PAGE_SHIFT;

		/* Free any previous set of page pointers */
		if (bp->b_pages)
		@@ -818,13 +757,12 @@ xfs_buf_associate_memory(

		for (i = 0; i < bp->b_page_count; i++) {
		bp->b_pages[i] = mem_to_page((void *)pageaddr);
		pageaddr += PAGE_CACHE_SIZE;
		pageaddr += PAGE_SIZE;
		}

		bp->b_count_desired = len;
		bp->b_buffer_length = buflen;
		bp->b_flags \|= XBF_MAPPED;
		bp->b_flags &= ~_XBF_PAGE_LOCKED;

		return 0;
		}
		@@ -931,20 +869,7 @@ xfs_buf_rele(


		/*
		* Mutual exclusion on buffers. Locking model:
		*
		* Buffers associated with inodes for which buffer locking
		* is not enabled are not protected by semaphores, and are
		* assumed to be exclusively owned by the caller. There is a
		* spinlock in the buffer, used by the caller when concurrent
		* access is possible.
		*/

		/*
		* Locks a buffer object, if it is not already locked. Note that this in
		* no way locks the underlying pages, so it is only useful for
		* synchronizing concurrent use of buffer objects, not for synchronizing
		* independent access to the underlying pages.
		* Lock a buffer object, if it is not already locked.
		*
		* If we come across a stale, pinned, locked buffer, we know that we are
		* being asked to lock a buffer that has been reallocated. Because it is
		@@ -978,10 +903,7 @@ xfs_buf_lock_value(
		}

		/*
		* Locks a buffer object.
		* Note that this in no way locks the underlying pages, so it is only
		* useful for synchronizing concurrent use of buffer objects, not for
		* synchronizing independent access to the underlying pages.
		* Lock a buffer object.
		*
		* If we come across a stale, pinned, locked buffer, we know that we
		* are being asked to lock a buffer that has been reallocated. Because
		@@ -998,7 +920,7 @@ xfs_buf_lock(
		if (atomic_read(&bp->b_pin_count) && (bp->b_flags & XBF_STALE))
		xfs_log_force(bp->b_target->bt_mount, 0);
		if (atomic_read(&bp->b_io_remaining))
		blk_run_address_space(bp->b_target->bt_mapping);
		blk_run_backing_dev(bp->b_target->bt_bdi, NULL);
		down(&bp->b_sema);
		XB_SET_OWNER(bp);

		@@ -1043,7 +965,7 @@ xfs_buf_wait_unpin(
		if (atomic_read(&bp->b_pin_count) == 0)
		break;
		if (atomic_read(&bp->b_io_remaining))
		blk_run_address_space(bp->b_target->bt_mapping);
		blk_run_backing_dev(bp->b_target->bt_bdi, NULL);
		schedule();
		}
		remove_wait_queue(&bp->b_waiters, &wait);
		@@ -1256,11 +1178,9 @@ _xfs_buf_ioend(
		xfs_buf_t *bp,
		int schedule)
		{
		if (atomic_dec_and_test(&bp->b_io_remaining) == 1) {
		bp->b_flags &= ~_XBF_PAGE_LOCKED;
		if (atomic_dec_and_test(&bp->b_io_remaining) == 1)
		xfs_buf_ioend(bp, schedule);
		}
		}

		STATIC void
		xfs_buf_bio_end_io(
		@@ -1268,35 +1188,12 @@ xfs_buf_bio_end_io(
		int error)
		{
		xfs_buf_t bp = (xfs_buf_t )bio->bi_private;
		unsigned int blocksize = bp->b_target->bt_bsize;
		struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;

		xfs_buf_ioerror(bp, -error);

		if (!error && xfs_buf_is_vmapped(bp) && (bp->b_flags & XBF_READ))
		invalidate_kernel_vmap_range(bp->b_addr, xfs_buf_vmap_len(bp));

		do {
		struct page *page = bvec->bv_page;

		ASSERT(!PagePrivate(page));
		if (unlikely(bp->b_error)) {
		if (bp->b_flags & XBF_READ)
		ClearPageUptodate(page);
		} else if (blocksize >= PAGE_CACHE_SIZE) {
		SetPageUptodate(page);
		} else if (!PagePrivate(page) &&
		(bp->b_flags & _XBF_PAGE_CACHE)) {
		set_page_region(page, bvec->bv_offset, bvec->bv_len);
		}

		if (--bvec >= bio->bi_io_vec)
		prefetchw(&bvec->bv_page->flags);

		if (bp->b_flags & _XBF_PAGE_LOCKED)
		unlock_page(page);
		} while (bvec >= bio->bi_io_vec);

		_xfs_buf_ioend(bp, 1);
		bio_put(bio);
		}
		@@ -1310,7 +1207,6 @@ _xfs_buf_ioapply(
		int offset = bp->b_offset;
		int size = bp->b_count_desired;
		sector_t sector = bp->b_bn;
		unsigned int blocksize = bp->b_target->bt_bsize;

		total_nr_pages = bp->b_page_count;
		map_i = 0;
		@@ -1331,29 +1227,6 @@ _xfs_buf_ioapply(
		(bp->b_flags & XBF_READ_AHEAD) ? READA : READ;
		}

		/* Special code path for reading a sub page size buffer in --
		* we populate up the whole page, and hence the other metadata
		* in the same page. This optimization is only valid when the
		* filesystem block size is not smaller than the page size.
		*/
		if ((bp->b_buffer_length < PAGE_CACHE_SIZE) &&
		((bp->b_flags & (XBF_READ\|_XBF_PAGE_LOCKED)) ==
		(XBF_READ\|_XBF_PAGE_LOCKED)) &&
		(blocksize >= PAGE_CACHE_SIZE)) {
		bio = bio_alloc(GFP_NOIO, 1);

		bio->bi_bdev = bp->b_target->bt_bdev;
		bio->bi_sector = sector - (offset >> BBSHIFT);
		bio->bi_end_io = xfs_buf_bio_end_io;
		bio->bi_private = bp;

		bio_add_page(bio, bp->b_pages[0], PAGE_CACHE_SIZE, 0);
		size = 0;

		atomic_inc(&bp->b_io_remaining);

		goto submit_io;
		}

		next_chunk:
		atomic_inc(&bp->b_io_remaining);
		@@ -1367,8 +1240,9 @@ next_chunk:
		bio->bi_end_io = xfs_buf_bio_end_io;
		bio->bi_private = bp;


		for (; size && nr_pages; nr_pages--, map_i++) {
		int rbytes, nbytes = PAGE_CACHE_SIZE - offset;
		int rbytes, nbytes = PAGE_SIZE - offset;

		if (nbytes > size)
		nbytes = size;
		@@ -1383,7 +1257,6 @@ next_chunk:
		total_nr_pages--;
		}

		submit_io:
		if (likely(bio->bi_size)) {
		if (xfs_buf_is_vmapped(bp)) {
		flush_kernel_vmap_range(bp->b_addr,
		@@ -1393,18 +1266,7 @@ submit_io:
		if (size)
		goto next_chunk;
		} else {
		/*
		* if we get here, no pages were added to the bio. However,
		* we can't just error out here - if the pages are locked then
		* we have to unlock them otherwise we can hang on a later
		* access to the page.
		*/
		xfs_buf_ioerror(bp, EIO);
		if (bp->b_flags & _XBF_PAGE_LOCKED) {
		int i;
		for (i = 0; i < bp->b_page_count; i++)
		unlock_page(bp->b_pages[i]);
		}
		bio_put(bio);
		}
		}
		@@ -1450,7 +1312,7 @@ xfs_buf_iowait(
		trace_xfs_buf_iowait(bp, _RET_IP_);

		if (atomic_read(&bp->b_io_remaining))
		blk_run_address_space(bp->b_target->bt_mapping);
		blk_run_backing_dev(bp->b_target->bt_bdi, NULL);
		wait_for_completion(&bp->b_iowait);

		trace_xfs_buf_iowait_done(bp, _RET_IP_);
		@@ -1468,8 +1330,8 @@ xfs_buf_offset(
		return XFS_BUF_PTR(bp) + offset;

		offset += bp->b_offset;
		page = bp->b_pages[offset >> PAGE_CACHE_SHIFT];
		return (xfs_caddr_t)page_address(page) + (offset & (PAGE_CACHE_SIZE-1));
		page = bp->b_pages[offset >> PAGE_SHIFT];
		return (xfs_caddr_t)page_address(page) + (offset & (PAGE_SIZE-1));
		}

		/*
		@@ -1491,9 +1353,9 @@ xfs_buf_iomove(
		page = bp->b_pages[xfs_buf_btoct(boff + bp->b_offset)];
		cpoff = xfs_buf_poff(boff + bp->b_offset);
		csize = min_t(size_t,
		PAGE_CACHE_SIZE-cpoff, bp->b_count_desired-boff);
		PAGE_SIZE-cpoff, bp->b_count_desired-boff);

		ASSERT(((csize + cpoff) <= PAGE_CACHE_SIZE));
		ASSERT(((csize + cpoff) <= PAGE_SIZE));

		switch (mode) {
		case XBRW_ZERO:
		@@ -1606,7 +1468,6 @@ xfs_free_buftarg(
		xfs_flush_buftarg(btp, 1);
		if (mp->m_flags & XFS_MOUNT_BARRIER)
		xfs_blkdev_issue_flush(btp);
		iput(btp->bt_mapping->host);

		kthread_stop(btp->bt_task);
		kmem_free(btp);
		@@ -1630,15 +1491,6 @@ xfs_setsize_buftarg_flags(
		return EINVAL;
		}

		if (verbose &&
		(PAGE_CACHE_SIZE / BITS_PER_LONG) > sectorsize) {
		printk(KERN_WARNING
		"XFS: %u byte sectors in use on device %s. "
		"This is suboptimal; %u or greater is ideal.\n",
		sectorsize, XFS_BUFTARG_NAME(btp),
		(unsigned int)PAGE_CACHE_SIZE / BITS_PER_LONG);
		}

		return 0;
		}

		@@ -1653,7 +1505,7 @@ xfs_setsize_buftarg_early(
		struct block_device *bdev)
		{
		return xfs_setsize_buftarg_flags(btp,
		PAGE_CACHE_SIZE, bdev_logical_block_size(bdev), 0);
		PAGE_SIZE, bdev_logical_block_size(bdev), 0);
		}

		int
		@@ -1665,41 +1517,6 @@ xfs_setsize_buftarg(
		return xfs_setsize_buftarg_flags(btp, blocksize, sectorsize, 1);
		}

		STATIC int
		xfs_mapping_buftarg(
		xfs_buftarg_t *btp,
		struct block_device *bdev)
		{
		struct backing_dev_info *bdi;
		struct inode *inode;
		struct address_space *mapping;
		static const struct address_space_operations mapping_aops = {
		.sync_page = block_sync_page,
		.migratepage = fail_migrate_page,
		};

		inode = new_inode(bdev->bd_inode->i_sb);
		if (!inode) {
		printk(KERN_WARNING
		"XFS: Cannot allocate mapping inode for device %s\n",
		XFS_BUFTARG_NAME(btp));
		return ENOMEM;
		}
		inode->i_ino = get_next_ino();
		inode->i_mode = S_IFBLK;
		inode->i_bdev = bdev;
		inode->i_rdev = bdev->bd_dev;
		bdi = blk_get_backing_dev_info(bdev);
		if (!bdi)
		bdi = &default_backing_dev_info;
		mapping = &inode->i_data;
		mapping->a_ops = &mapping_aops;
		mapping->backing_dev_info = bdi;
		mapping_set_gfp_mask(mapping, GFP_NOFS);
		btp->bt_mapping = mapping;
		return 0;
		}

		STATIC int
		xfs_alloc_delwrite_queue(
		xfs_buftarg_t *btp,
		@@ -1728,12 +1545,14 @@ xfs_alloc_buftarg(
		btp->bt_mount = mp;
		btp->bt_dev = bdev->bd_dev;
		btp->bt_bdev = bdev;
		btp->bt_bdi = blk_get_backing_dev_info(bdev);
		if (!btp->bt_bdi)
		goto error;

		INIT_LIST_HEAD(&btp->bt_lru);
		spin_lock_init(&btp->bt_lru_lock);
		if (xfs_setsize_buftarg_early(btp, bdev))
		goto error;
		if (xfs_mapping_buftarg(btp, bdev))
		goto error;
		if (xfs_alloc_delwrite_queue(btp, fsname))
		goto error;
		btp->bt_shrinker.shrink = xfs_buftarg_shrink;
		@@ -1955,7 +1774,7 @@ xfsbufd(
		count++;
		}
		if (count)
		blk_run_address_space(target->bt_mapping);
		blk_run_backing_dev(target->bt_bdi, NULL);

		} while (!kthread_should_stop());

		@@ -2003,7 +1822,7 @@ xfs_flush_buftarg(

		if (wait) {
		/* Expedite and wait for IO to complete. */
		blk_run_address_space(target->bt_mapping);
		blk_run_backing_dev(target->bt_bdi, NULL);
		while (!list_empty(&wait_list)) {
		bp = list_first_entry(&wait_list, struct xfs_buf, b_list);

fs/xfs/linux-2.6/xfs_buf.h

+4 −36

Original line number	Diff line number	Diff line
		@@ -61,30 +61,11 @@ typedef enum {
		#define XBF_DONT_BLOCK (1 << 16)/* do not block in current thread */

		/* flags used only internally */
		#define _XBF_PAGE_CACHE (1 << 17)/* backed by pagecache */
		#define _XBF_PAGES (1 << 18)/* backed by refcounted pages */
		#define _XBF_RUN_QUEUES (1 << 19)/* run block device task queue */
		#define _XBF_KMEM (1 << 20)/* backed by heap memory */
		#define _XBF_DELWRI_Q (1 << 21)/* buffer on delwri queue */

		/*
		* Special flag for supporting metadata blocks smaller than a FSB.
		*
		* In this case we can have multiple xfs_buf_t on a single page and
		* need to lock out concurrent xfs_buf_t readers as they only
		* serialise access to the buffer.
		*
		* If the FSB size >= PAGE_CACHE_SIZE case, we have no serialisation
		* between reads of the page. Hence we can have one thread read the
		* page and modify it, but then race with another thread that thinks
		* the page is not up-to-date and hence reads it again.
		*
		* The result is that the first modifcation to the page is lost.
		* This sort of AGF/AGI reading race can happen when unlinking inodes
		* that require truncation and results in the AGI unlinked list
		* modifications being lost.
		*/
		#define _XBF_PAGE_LOCKED (1 << 22)

		typedef unsigned int xfs_buf_flags_t;

		#define XFS_BUF_FLAGS \
		@@ -100,12 +81,10 @@ typedef unsigned int xfs_buf_flags_t;
		{ XBF_LOCK, "LOCK" }, /* should never be set */\
		{ XBF_TRYLOCK, "TRYLOCK" }, /* ditto */\
		{ XBF_DONT_BLOCK, "DONT_BLOCK" }, /* ditto */\
		{ _XBF_PAGE_CACHE, "PAGE_CACHE" }, \
		{ _XBF_PAGES, "PAGES" }, \
		{ _XBF_RUN_QUEUES, "RUN_QUEUES" }, \
		{ _XBF_DELWRI_Q, "DELWRI_Q" }, \
		{ _XBF_PAGE_LOCKED, "PAGE_LOCKED" }

		{ _XBF_KMEM, "KMEM" }, \
		{ _XBF_DELWRI_Q, "DELWRI_Q" }

		typedef enum {
		XBT_FORCE_SLEEP = 0,
		@@ -120,7 +99,7 @@ typedef struct xfs_bufhash {
		typedef struct xfs_buftarg {
		dev_t bt_dev;
		struct block_device *bt_bdev;
		struct address_space *bt_mapping;
		struct backing_dev_info *bt_bdi;
		struct xfs_mount *bt_mount;
		unsigned int bt_bsize;
		unsigned int bt_sshift;
		@@ -139,17 +118,6 @@ typedef struct xfs_buftarg {
		unsigned int bt_lru_nr;
		} xfs_buftarg_t;

		/*
		* xfs_buf_t: Buffer structure for pagecache-based buffers
		*
		* This buffer structure is used by the pagecache buffer management routines
		* to refer to an assembly of pages forming a logical buffer.
		*
		* The buffer structure is used on a temporary basis only, and discarded when
		* released. The real data storage is recorded in the pagecache. Buffers are
		* hashed to the block device on which the file system resides.
		*/

		struct xfs_buf;
		typedef void (xfs_buf_iodone_t)(struct xfs_buf );

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