netns xfrm: fix "ip xfrm state|policy count" misreport

[safe/jmp/linux-2.6] / fs / mpage.c

diff --git a/fs/mpage.c b/fs/mpage.c
index 5df5643..42381bd 100644 (file)
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -6,7 +6,7 @@
  * Contains functions related to preparing and submitting BIOs which contain
  * multiple pagecache pages.
  *
- * 15May2002   akpm@zip.com.au
+ * 15May2002   Andrew Morton
  *             Initial version
  * 27Jun2002   axboe@suse.de
  *             use bio_add_page() to build bio's just the right size
@@ -240,7 +240,6 @@ do_mpage_readpage(struct bio *bio, struct page *page, unsigned nr_pages,
                                first_hole = page_block;
                        page_block++;
                        block_in_file++;
-                       clear_buffer_mapped(map_bh);
                        continue;
                }
 
@@ -307,7 +306,10 @@ alloc_new:
                goto alloc_new;
        }
 
-       if (buffer_boundary(map_bh) || (first_hole != blocks_per_page))
+       relative_block = block_in_file - *first_logical_block;
+       nblocks = map_bh->b_size >> blkbits;
+       if ((buffer_boundary(map_bh) && relative_block == nblocks) ||
+           (first_hole != blocks_per_page))
                bio = mpage_bio_submit(READ, bio);
        else
                *last_block_in_bio = blocks[blocks_per_page - 1];
@@ -325,16 +327,12 @@ confused:
 }
 
 /**
- * mpage_readpages - populate an address space with some pages, and
- *                       start reads against them.
- *
+ * mpage_readpages - populate an address space with some pages & start reads against them
  * @mapping: the address_space
  * @pages: The address of a list_head which contains the target pages.  These
  *   pages have their ->index populated and are otherwise uninitialised.
- *
  *   The page at @pages->prev has the lowest file offset, and reads should be
  *   issued in @pages->prev to @pages->next order.
- *
  * @nr_pages: The number of pages at *@pages
  * @get_block: The filesystem's block mapper function.
  *
@@ -360,6 +358,7 @@ confused:
  * So an mpage read of the first 16 blocks of an ext2 file will cause I/O to be
  * submitted in the following order:
  *     12 0 1 2 3 4 5 6 7 8 9 10 11 13 14 15 16
+ *
  * because the indirect block has to be read to get the mappings of blocks
  * 13,14,15,16.  Obviously, this impacts performance.
  *
@@ -380,7 +379,8 @@ mpage_readpages(struct address_space *mapping, struct list_head *pages,
        struct buffer_head map_bh;
        unsigned long first_logical_block = 0;
 
-       clear_buffer_mapped(&map_bh);
+       map_bh.b_state = 0;
+       map_bh.b_size = 0;
        for (page_idx = 0; page_idx < nr_pages; page_idx++) {
                struct page *page = list_entry(pages->prev, struct page, lru);
 
@@ -413,7 +413,8 @@ int mpage_readpage(struct page *page, get_block_t get_block)
        struct buffer_head map_bh;
        unsigned long first_logical_block = 0;
 
-       clear_buffer_mapped(&map_bh);
+       map_bh.b_state = 0;
+       map_bh.b_size = 0;
        bio = do_mpage_readpage(bio, page, 1, &last_block_in_bio,
                        &map_bh, &first_logical_block, get_block);
        if (bio)
@@ -438,6 +439,7 @@ EXPORT_SYMBOL(mpage_readpage);
  * written, so it can intelligently allocate a suitably-sized BIO.  For now,
  * just allocate full-size (16-page) BIOs.
  */
+
 struct mpage_data {
        struct bio *bio;
        sector_t last_block_in_bio;
@@ -446,7 +448,7 @@ struct mpage_data {
 };
 
 static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
-                            void *data)
+                     void *data)
 {
        struct mpage_data *mpd = data;
        struct bio *bio = mpd->bio;
@@ -656,9 +658,7 @@ out:
 }
 
 /**
- * mpage_writepages - walk the list of dirty pages of the given
- * address space and writepage() all of them.
- * 
+ * mpage_writepages - walk the list of dirty pages of the given address space & writepage() all of them
  * @mapping: address space structure to write
  * @wbc: subtract the number of written pages from *@wbc->nr_to_write
  * @get_block: the filesystem's block mapper function.