diff options
| -rw-r--r-- | fs/xfs/xfs_buf.c | 39 | ||||
| -rw-r--r-- | fs/xfs/xfs_buf.h | 5 |
2 files changed, 21 insertions, 23 deletions
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c index ab3c4491777b..942cf5051ab4 100644 --- a/fs/xfs/xfs_buf.c +++ b/fs/xfs/xfs_buf.c @@ -306,7 +306,7 @@ xfs_buf_allocate_memory( size_t nbytes, offset; gfp_t gfp_mask = xb_to_gfp(flags); unsigned short page_count, i; - xfs_off_t end; + xfs_off_t start, end; int error; /* @@ -314,15 +314,15 @@ xfs_buf_allocate_memory( * 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_length < BTOBB(PAGE_SIZE)) { - bp->b_addr = kmem_alloc(BBTOB(bp->b_length), xb_to_km(flags)); + size = BBTOB(bp->b_length); + if (size < PAGE_SIZE) { + bp->b_addr = kmem_alloc(size, 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 + BBTOB(bp->b_length) - 1) & - PAGE_MASK) != + if (((unsigned long)(bp->b_addr + size - 1) & PAGE_MASK) != ((unsigned long)bp->b_addr & PAGE_MASK)) { /* b_addr spans two pages - use alloc_page instead */ kmem_free(bp->b_addr); @@ -338,14 +338,14 @@ xfs_buf_allocate_memory( } use_alloc_page: - end = BBTOB(bp->b_bn + bp->b_length); - page_count = xfs_buf_btoc(end) - xfs_buf_btoct(BBTOB(bp->b_bn)); + start = BBTOB(bp->b_bn) >> PAGE_SHIFT; + end = (BBTOB(bp->b_bn + bp->b_length) + PAGE_SIZE - 1) >> PAGE_SHIFT; + page_count = end - start; error = _xfs_buf_get_pages(bp, page_count, flags); if (unlikely(error)) return error; offset = bp->b_offset; - size = BBTOB(bp->b_length); bp->b_flags |= _XBF_PAGES; for (i = 0; i < bp->b_page_count; i++) { @@ -1320,27 +1320,30 @@ xfs_buf_iomove( void *data, /* data address */ xfs_buf_rw_t mode) /* read/write/zero flag */ { - size_t bend, cpoff, csize; - struct page *page; + size_t bend; bend = boff + bsize; while (boff < bend) { - 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_SIZE - cpoff, BBTOB(bp->b_io_length) - boff); + struct page *page; + int page_index, page_offset, csize; + + page_index = (boff + bp->b_offset) >> PAGE_SHIFT; + page_offset = (boff + bp->b_offset) & ~PAGE_MASK; + page = bp->b_pages[page_index]; + csize = min_t(size_t, PAGE_SIZE - page_offset, + BBTOB(bp->b_io_length) - boff); - ASSERT(((csize + cpoff) <= PAGE_SIZE)); + ASSERT((csize + page_offset) <= PAGE_SIZE); switch (mode) { case XBRW_ZERO: - memset(page_address(page) + cpoff, 0, csize); + memset(page_address(page) + page_offset, 0, csize); break; case XBRW_READ: - memcpy(data, page_address(page) + cpoff, csize); + memcpy(data, page_address(page) + page_offset, csize); break; case XBRW_WRITE: - memcpy(page_address(page) + cpoff, data, csize); + memcpy(page_address(page) + page_offset, data, csize); } boff += csize; diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h index 9787645fa54c..5b048f7d13ea 100644 --- a/fs/xfs/xfs_buf.h +++ b/fs/xfs/xfs_buf.h @@ -32,11 +32,6 @@ #define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL)) -#define xfs_buf_ctob(pp) ((pp) * PAGE_CACHE_SIZE) -#define xfs_buf_btoc(dd) (((dd) + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) -#define xfs_buf_btoct(dd) ((dd) >> PAGE_CACHE_SHIFT) -#define xfs_buf_poff(aa) ((aa) & ~PAGE_CACHE_MASK) - typedef enum { XBRW_READ = 1, /* transfer into target memory */ XBRW_WRITE = 2, /* transfer from target memory */ |