Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs
* 'for-linus' of git://oss.sgi.com/xfs/xfs: xfs: stop using the page cache to back the buffer cache xfs: register the inode cache shrinker before quotachecks xfs: xfs_trans_read_buf() should return an error on failure xfs: introduce inode cluster buffer trylocks for xfs_iflush vmap: flush vmap aliases when mapping fails xfs: preallocation transactions do not need to be synchronous Fix up trivial conflicts in fs/xfs/linux-2.6/xfs_buf.c due to plug removal.hifive-unleashed-5.1
Linus Torvalds
commit
c5850150d0
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@ -93,75 +93,6 @@ xfs_buf_vmap_len(
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return (bp->b_page_count * PAGE_SIZE) - bp->b_offset;
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}
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/*
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* Page Region interfaces.
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*
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* For pages in filesystems where the blocksize is smaller than the
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* pagesize, we use the page->private field (long) to hold a bitmap
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* of uptodate regions within the page.
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*
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* Each such region is "bytes per page / bits per long" bytes long.
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*
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* NBPPR == number-of-bytes-per-page-region
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* BTOPR == bytes-to-page-region (rounded up)
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* BTOPRT == bytes-to-page-region-truncated (rounded down)
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*/
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#if (BITS_PER_LONG == 32)
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#define PRSHIFT (PAGE_CACHE_SHIFT - 5) /* (32 == 1<<5) */
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#elif (BITS_PER_LONG == 64)
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#define PRSHIFT (PAGE_CACHE_SHIFT - 6) /* (64 == 1<<6) */
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#else
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#error BITS_PER_LONG must be 32 or 64
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#endif
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#define NBPPR (PAGE_CACHE_SIZE/BITS_PER_LONG)
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#define BTOPR(b) (((unsigned int)(b) + (NBPPR - 1)) >> PRSHIFT)
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#define BTOPRT(b) (((unsigned int)(b) >> PRSHIFT))
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STATIC unsigned long
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page_region_mask(
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size_t offset,
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size_t length)
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{
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unsigned long mask;
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int first, final;
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first = BTOPR(offset);
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final = BTOPRT(offset + length - 1);
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first = min(first, final);
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mask = ~0UL;
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mask <<= BITS_PER_LONG - (final - first);
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mask >>= BITS_PER_LONG - (final);
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ASSERT(offset + length <= PAGE_CACHE_SIZE);
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ASSERT((final - first) < BITS_PER_LONG && (final - first) >= 0);
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return mask;
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}
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STATIC void
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set_page_region(
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struct page *page,
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size_t offset,
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size_t length)
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{
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set_page_private(page,
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page_private(page) | page_region_mask(offset, length));
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if (page_private(page) == ~0UL)
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SetPageUptodate(page);
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}
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STATIC int
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test_page_region(
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struct page *page,
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size_t offset,
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size_t length)
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{
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unsigned long mask = page_region_mask(offset, length);
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return (mask && (page_private(page) & mask) == mask);
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}
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/*
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* xfs_buf_lru_add - add a buffer to the LRU.
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*
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@ -332,7 +263,7 @@ xfs_buf_free(
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ASSERT(list_empty(&bp->b_lru));
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if (bp->b_flags & (_XBF_PAGE_CACHE|_XBF_PAGES)) {
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if (bp->b_flags & _XBF_PAGES) {
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uint i;
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if (xfs_buf_is_vmapped(bp))
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@ -342,25 +273,22 @@ xfs_buf_free(
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for (i = 0; i < bp->b_page_count; i++) {
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struct page *page = bp->b_pages[i];
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if (bp->b_flags & _XBF_PAGE_CACHE)
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ASSERT(!PagePrivate(page));
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page_cache_release(page);
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__free_page(page);
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}
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}
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} else if (bp->b_flags & _XBF_KMEM)
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kmem_free(bp->b_addr);
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_xfs_buf_free_pages(bp);
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xfs_buf_deallocate(bp);
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}
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/*
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* Finds all pages for buffer in question and builds it's page list.
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* Allocates all the pages for buffer in question and builds it's page list.
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*/
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STATIC int
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_xfs_buf_lookup_pages(
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xfs_buf_allocate_memory(
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xfs_buf_t *bp,
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uint flags)
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{
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struct address_space *mapping = bp->b_target->bt_mapping;
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size_t blocksize = bp->b_target->bt_bsize;
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size_t size = bp->b_count_desired;
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size_t nbytes, offset;
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gfp_t gfp_mask = xb_to_gfp(flags);
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@ -369,29 +297,55 @@ _xfs_buf_lookup_pages(
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xfs_off_t end;
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int error;
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/*
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* for buffers that are contained within a single page, just allocate
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* the memory from the heap - there's no need for the complexity of
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* page arrays to keep allocation down to order 0.
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*/
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if (bp->b_buffer_length < PAGE_SIZE) {
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bp->b_addr = kmem_alloc(bp->b_buffer_length, xb_to_km(flags));
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if (!bp->b_addr) {
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/* low memory - use alloc_page loop instead */
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goto use_alloc_page;
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}
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if (((unsigned long)(bp->b_addr + bp->b_buffer_length - 1) &
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PAGE_MASK) !=
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((unsigned long)bp->b_addr & PAGE_MASK)) {
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/* b_addr spans two pages - use alloc_page instead */
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kmem_free(bp->b_addr);
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bp->b_addr = NULL;
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goto use_alloc_page;
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}
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bp->b_offset = offset_in_page(bp->b_addr);
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bp->b_pages = bp->b_page_array;
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bp->b_pages[0] = virt_to_page(bp->b_addr);
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bp->b_page_count = 1;
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bp->b_flags |= XBF_MAPPED | _XBF_KMEM;
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return 0;
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}
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use_alloc_page:
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end = bp->b_file_offset + bp->b_buffer_length;
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page_count = xfs_buf_btoc(end) - xfs_buf_btoct(bp->b_file_offset);
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error = _xfs_buf_get_pages(bp, page_count, flags);
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if (unlikely(error))
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return error;
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bp->b_flags |= _XBF_PAGE_CACHE;
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offset = bp->b_offset;
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first = bp->b_file_offset >> PAGE_CACHE_SHIFT;
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first = bp->b_file_offset >> PAGE_SHIFT;
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bp->b_flags |= _XBF_PAGES;
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for (i = 0; i < bp->b_page_count; i++) {
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struct page *page;
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uint retries = 0;
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retry:
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page = find_or_create_page(mapping, first + i, gfp_mask);
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retry:
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page = alloc_page(gfp_mask);
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if (unlikely(page == NULL)) {
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if (flags & XBF_READ_AHEAD) {
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bp->b_page_count = i;
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for (i = 0; i < bp->b_page_count; i++)
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unlock_page(bp->b_pages[i]);
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return -ENOMEM;
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error = ENOMEM;
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goto out_free_pages;
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}
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/*
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@ -412,33 +366,16 @@ _xfs_buf_lookup_pages(
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XFS_STATS_INC(xb_page_found);
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nbytes = min_t(size_t, size, PAGE_CACHE_SIZE - offset);
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nbytes = min_t(size_t, size, PAGE_SIZE - offset);
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size -= nbytes;
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ASSERT(!PagePrivate(page));
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if (!PageUptodate(page)) {
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page_count--;
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if (blocksize >= PAGE_CACHE_SIZE) {
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if (flags & XBF_READ)
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bp->b_flags |= _XBF_PAGE_LOCKED;
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} else if (!PagePrivate(page)) {
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if (test_page_region(page, offset, nbytes))
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page_count++;
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}
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}
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bp->b_pages[i] = page;
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offset = 0;
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}
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return 0;
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if (!(bp->b_flags & _XBF_PAGE_LOCKED)) {
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for (i = 0; i < bp->b_page_count; i++)
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unlock_page(bp->b_pages[i]);
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}
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if (page_count == bp->b_page_count)
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bp->b_flags |= XBF_DONE;
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out_free_pages:
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for (i = 0; i < bp->b_page_count; i++)
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__free_page(bp->b_pages[i]);
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return error;
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}
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@ -450,14 +387,23 @@ _xfs_buf_map_pages(
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xfs_buf_t *bp,
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uint flags)
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{
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/* A single page buffer is always mappable */
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ASSERT(bp->b_flags & _XBF_PAGES);
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if (bp->b_page_count == 1) {
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/* A single page buffer is always mappable */
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bp->b_addr = page_address(bp->b_pages[0]) + bp->b_offset;
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bp->b_flags |= XBF_MAPPED;
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} else if (flags & XBF_MAPPED) {
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bp->b_addr = vm_map_ram(bp->b_pages, bp->b_page_count,
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-1, PAGE_KERNEL);
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if (unlikely(bp->b_addr == NULL))
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int retried = 0;
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do {
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bp->b_addr = vm_map_ram(bp->b_pages, bp->b_page_count,
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-1, PAGE_KERNEL);
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if (bp->b_addr)
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break;
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vm_unmap_aliases();
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} while (retried++ <= 1);
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if (!bp->b_addr)
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return -ENOMEM;
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bp->b_addr += bp->b_offset;
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bp->b_flags |= XBF_MAPPED;
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@ -568,9 +514,14 @@ found:
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}
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}
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/*
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* if the buffer is stale, clear all the external state associated with
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* it. We need to keep flags such as how we allocated the buffer memory
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* intact here.
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*/
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if (bp->b_flags & XBF_STALE) {
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ASSERT((bp->b_flags & _XBF_DELWRI_Q) == 0);
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bp->b_flags &= XBF_MAPPED;
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bp->b_flags &= XBF_MAPPED | _XBF_KMEM | _XBF_PAGES;
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}
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trace_xfs_buf_find(bp, flags, _RET_IP_);
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@ -591,7 +542,7 @@ xfs_buf_get(
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xfs_buf_flags_t flags)
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{
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xfs_buf_t *bp, *new_bp;
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int error = 0, i;
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int error = 0;
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new_bp = xfs_buf_allocate(flags);
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if (unlikely(!new_bp))
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@ -599,7 +550,7 @@ xfs_buf_get(
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bp = _xfs_buf_find(target, ioff, isize, flags, new_bp);
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if (bp == new_bp) {
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error = _xfs_buf_lookup_pages(bp, flags);
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error = xfs_buf_allocate_memory(bp, flags);
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if (error)
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goto no_buffer;
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} else {
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@ -608,9 +559,6 @@ xfs_buf_get(
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return NULL;
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}
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for (i = 0; i < bp->b_page_count; i++)
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mark_page_accessed(bp->b_pages[i]);
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if (!(bp->b_flags & XBF_MAPPED)) {
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error = _xfs_buf_map_pages(bp, flags);
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if (unlikely(error)) {
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@ -711,8 +659,7 @@ xfs_buf_readahead(
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{
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struct backing_dev_info *bdi;
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bdi = target->bt_mapping->backing_dev_info;
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if (bdi_read_congested(bdi))
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if (bdi_read_congested(target->bt_bdi))
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return;
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xfs_buf_read(target, ioff, isize,
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@ -790,10 +737,10 @@ xfs_buf_associate_memory(
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size_t buflen;
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int page_count;
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pageaddr = (unsigned long)mem & PAGE_CACHE_MASK;
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pageaddr = (unsigned long)mem & PAGE_MASK;
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offset = (unsigned long)mem - pageaddr;
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buflen = PAGE_CACHE_ALIGN(len + offset);
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page_count = buflen >> PAGE_CACHE_SHIFT;
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buflen = PAGE_ALIGN(len + offset);
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page_count = buflen >> PAGE_SHIFT;
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/* Free any previous set of page pointers */
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if (bp->b_pages)
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@ -810,13 +757,12 @@ xfs_buf_associate_memory(
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for (i = 0; i < bp->b_page_count; i++) {
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bp->b_pages[i] = mem_to_page((void *)pageaddr);
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pageaddr += PAGE_CACHE_SIZE;
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pageaddr += PAGE_SIZE;
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}
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bp->b_count_desired = len;
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bp->b_buffer_length = buflen;
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bp->b_flags |= XBF_MAPPED;
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bp->b_flags &= ~_XBF_PAGE_LOCKED;
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return 0;
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}
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@ -923,20 +869,7 @@ xfs_buf_rele(
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|
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|
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/*
|
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* Mutual exclusion on buffers. Locking model:
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*
|
||||
* Buffers associated with inodes for which buffer locking
|
||||
* is not enabled are not protected by semaphores, and are
|
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* assumed to be exclusively owned by the caller. There is a
|
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* 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
|
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* no way locks the underlying pages, so it is only useful for
|
||||
* synchronizing concurrent use of buffer objects, not for synchronizing
|
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* independent access to the underlying pages.
|
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* 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
|
||||
|
|
@ -970,10 +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
|
||||
|
|
@ -1246,10 +1176,8 @@ _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
|
||||
|
|
@ -1258,35 +1186,12 @@ 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);
|
||||
}
|
||||
|
|
@ -1300,7 +1205,6 @@ _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;
|
||||
|
|
@ -1321,29 +1225,6 @@ _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);
|
||||
|
|
@ -1357,8 +1238,9 @@ 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;
|
||||
|
|
@ -1373,7 +1255,6 @@ 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,
|
||||
|
|
@ -1383,18 +1264,7 @@ 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);
|
||||
}
|
||||
}
|
||||
|
|
@ -1458,8 +1328,8 @@ 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));
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -1481,9 +1351,9 @@ 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:
|
||||
|
|
@ -1596,7 +1466,6 @@ 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);
|
||||
|
|
@ -1620,15 +1489,6 @@ 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;
|
||||
}
|
||||
|
||||
|
|
@ -1643,7 +1503,7 @@ 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
|
||||
|
|
@ -1655,40 +1515,6 @@ 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 = {
|
||||
.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,
|
||||
|
|
@ -1717,12 +1543,14 @@ 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;
|
||||
|
|
|
|||
|
|
@ -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 *);
|
||||
|
||||
|
|
|
|||
|
|
@ -896,6 +896,7 @@ xfs_file_fallocate(
|
|||
xfs_flock64_t bf;
|
||||
xfs_inode_t *ip = XFS_I(inode);
|
||||
int cmd = XFS_IOC_RESVSP;
|
||||
int attr_flags = XFS_ATTR_NOLOCK;
|
||||
|
||||
if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
|
||||
return -EOPNOTSUPP;
|
||||
|
|
@ -918,7 +919,10 @@ xfs_file_fallocate(
|
|||
goto out_unlock;
|
||||
}
|
||||
|
||||
error = -xfs_change_file_space(ip, cmd, &bf, 0, XFS_ATTR_NOLOCK);
|
||||
if (file->f_flags & O_DSYNC)
|
||||
attr_flags |= XFS_ATTR_SYNC;
|
||||
|
||||
error = -xfs_change_file_space(ip, cmd, &bf, 0, attr_flags);
|
||||
if (error)
|
||||
goto out_unlock;
|
||||
|
||||
|
|
|
|||
|
|
@ -624,6 +624,10 @@ xfs_ioc_space(
|
|||
|
||||
if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
|
||||
attr_flags |= XFS_ATTR_NONBLOCK;
|
||||
|
||||
if (filp->f_flags & O_DSYNC)
|
||||
attr_flags |= XFS_ATTR_SYNC;
|
||||
|
||||
if (ioflags & IO_INVIS)
|
||||
attr_flags |= XFS_ATTR_DMI;
|
||||
|
||||
|
|
|
|||
|
|
@ -1078,7 +1078,7 @@ xfs_fs_write_inode(
|
|||
error = 0;
|
||||
goto out_unlock;
|
||||
}
|
||||
error = xfs_iflush(ip, 0);
|
||||
error = xfs_iflush(ip, SYNC_TRYLOCK);
|
||||
}
|
||||
|
||||
out_unlock:
|
||||
|
|
@ -1539,10 +1539,14 @@ xfs_fs_fill_super(
|
|||
if (error)
|
||||
goto out_free_sb;
|
||||
|
||||
error = xfs_mountfs(mp);
|
||||
if (error)
|
||||
goto out_filestream_unmount;
|
||||
|
||||
/*
|
||||
* we must configure the block size in the superblock before we run the
|
||||
* full mount process as the mount process can lookup and cache inodes.
|
||||
* For the same reason we must also initialise the syncd and register
|
||||
* the inode cache shrinker so that inodes can be reclaimed during
|
||||
* operations like a quotacheck that iterate all inodes in the
|
||||
* filesystem.
|
||||
*/
|
||||
sb->s_magic = XFS_SB_MAGIC;
|
||||
sb->s_blocksize = mp->m_sb.sb_blocksize;
|
||||
sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
|
||||
|
|
@ -1550,6 +1554,16 @@ xfs_fs_fill_super(
|
|||
sb->s_time_gran = 1;
|
||||
set_posix_acl_flag(sb);
|
||||
|
||||
error = xfs_syncd_init(mp);
|
||||
if (error)
|
||||
goto out_filestream_unmount;
|
||||
|
||||
xfs_inode_shrinker_register(mp);
|
||||
|
||||
error = xfs_mountfs(mp);
|
||||
if (error)
|
||||
goto out_syncd_stop;
|
||||
|
||||
root = igrab(VFS_I(mp->m_rootip));
|
||||
if (!root) {
|
||||
error = ENOENT;
|
||||
|
|
@ -1565,14 +1579,11 @@ xfs_fs_fill_super(
|
|||
goto fail_vnrele;
|
||||
}
|
||||
|
||||
error = xfs_syncd_init(mp);
|
||||
if (error)
|
||||
goto fail_vnrele;
|
||||
|
||||
xfs_inode_shrinker_register(mp);
|
||||
|
||||
return 0;
|
||||
|
||||
out_syncd_stop:
|
||||
xfs_inode_shrinker_unregister(mp);
|
||||
xfs_syncd_stop(mp);
|
||||
out_filestream_unmount:
|
||||
xfs_filestream_unmount(mp);
|
||||
out_free_sb:
|
||||
|
|
@ -1596,6 +1607,9 @@ xfs_fs_fill_super(
|
|||
}
|
||||
|
||||
fail_unmount:
|
||||
xfs_inode_shrinker_unregister(mp);
|
||||
xfs_syncd_stop(mp);
|
||||
|
||||
/*
|
||||
* Blow away any referenced inode in the filestreams cache.
|
||||
* This can and will cause log traffic as inodes go inactive
|
||||
|
|
|
|||
|
|
@ -761,8 +761,10 @@ xfs_reclaim_inode(
|
|||
struct xfs_perag *pag,
|
||||
int sync_mode)
|
||||
{
|
||||
int error = 0;
|
||||
int error;
|
||||
|
||||
restart:
|
||||
error = 0;
|
||||
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
||||
if (!xfs_iflock_nowait(ip)) {
|
||||
if (!(sync_mode & SYNC_WAIT))
|
||||
|
|
@ -788,9 +790,31 @@ xfs_reclaim_inode(
|
|||
if (xfs_inode_clean(ip))
|
||||
goto reclaim;
|
||||
|
||||
/* Now we have an inode that needs flushing */
|
||||
error = xfs_iflush(ip, sync_mode);
|
||||
/*
|
||||
* Now we have an inode that needs flushing.
|
||||
*
|
||||
* We do a nonblocking flush here even if we are doing a SYNC_WAIT
|
||||
* reclaim as we can deadlock with inode cluster removal.
|
||||
* xfs_ifree_cluster() can lock the inode buffer before it locks the
|
||||
* ip->i_lock, and we are doing the exact opposite here. As a result,
|
||||
* doing a blocking xfs_itobp() to get the cluster buffer will result
|
||||
* in an ABBA deadlock with xfs_ifree_cluster().
|
||||
*
|
||||
* As xfs_ifree_cluser() must gather all inodes that are active in the
|
||||
* cache to mark them stale, if we hit this case we don't actually want
|
||||
* to do IO here - we want the inode marked stale so we can simply
|
||||
* reclaim it. Hence if we get an EAGAIN error on a SYNC_WAIT flush,
|
||||
* just unlock the inode, back off and try again. Hopefully the next
|
||||
* pass through will see the stale flag set on the inode.
|
||||
*/
|
||||
error = xfs_iflush(ip, SYNC_TRYLOCK | sync_mode);
|
||||
if (sync_mode & SYNC_WAIT) {
|
||||
if (error == EAGAIN) {
|
||||
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
||||
/* backoff longer than in xfs_ifree_cluster */
|
||||
delay(2);
|
||||
goto restart;
|
||||
}
|
||||
xfs_iflock(ip);
|
||||
goto reclaim;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -2835,7 +2835,7 @@ xfs_iflush(
|
|||
* Get the buffer containing the on-disk inode.
|
||||
*/
|
||||
error = xfs_itobp(mp, NULL, ip, &dip, &bp,
|
||||
(flags & SYNC_WAIT) ? XBF_LOCK : XBF_TRYLOCK);
|
||||
(flags & SYNC_TRYLOCK) ? XBF_TRYLOCK : XBF_LOCK);
|
||||
if (error || !bp) {
|
||||
xfs_ifunlock(ip);
|
||||
return error;
|
||||
|
|
|
|||
|
|
@ -760,11 +760,11 @@ xfs_inode_item_push(
|
|||
* Push the inode to it's backing buffer. This will not remove the
|
||||
* inode from the AIL - a further push will be required to trigger a
|
||||
* buffer push. However, this allows all the dirty inodes to be pushed
|
||||
* to the buffer before it is pushed to disk. THe buffer IO completion
|
||||
* will pull th einode from the AIL, mark it clean and unlock the flush
|
||||
* to the buffer before it is pushed to disk. The buffer IO completion
|
||||
* will pull the inode from the AIL, mark it clean and unlock the flush
|
||||
* lock.
|
||||
*/
|
||||
(void) xfs_iflush(ip, 0);
|
||||
(void) xfs_iflush(ip, SYNC_TRYLOCK);
|
||||
xfs_iunlock(ip, XFS_ILOCK_SHARED);
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -383,7 +383,8 @@ xfs_trans_read_buf(
|
|||
bp = xfs_buf_read(target, blkno, len, flags | XBF_DONT_BLOCK);
|
||||
if (bp == NULL) {
|
||||
*bpp = NULL;
|
||||
return 0;
|
||||
return (flags & XBF_TRYLOCK) ?
|
||||
0 : XFS_ERROR(ENOMEM);
|
||||
}
|
||||
if (XFS_BUF_GETERROR(bp) != 0) {
|
||||
XFS_BUF_SUPER_STALE(bp);
|
||||
|
|
|
|||
|
|
@ -2831,7 +2831,8 @@ xfs_change_file_space(
|
|||
ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC;
|
||||
|
||||
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
||||
xfs_trans_set_sync(tp);
|
||||
if (attr_flags & XFS_ATTR_SYNC)
|
||||
xfs_trans_set_sync(tp);
|
||||
|
||||
error = xfs_trans_commit(tp, 0);
|
||||
|
||||
|
|
|
|||
|
|
@ -18,6 +18,7 @@ int xfs_setattr(struct xfs_inode *ip, struct iattr *vap, int flags);
|
|||
#define XFS_ATTR_NONBLOCK 0x02 /* return EAGAIN if operation would block */
|
||||
#define XFS_ATTR_NOLOCK 0x04 /* Don't grab any conflicting locks */
|
||||
#define XFS_ATTR_NOACL 0x08 /* Don't call xfs_acl_chmod */
|
||||
#define XFS_ATTR_SYNC 0x10 /* synchronous operation required */
|
||||
|
||||
int xfs_readlink(struct xfs_inode *ip, char *link);
|
||||
int xfs_release(struct xfs_inode *ip);
|
||||
|
|
|
|||
Loading…
Reference in New Issue