fifo: Do not restart open() if it already found a partner

[firefly-linux-kernel-4.4.55.git] / fs / buffer.c

diff --git a/fs/buffer.c b/fs/buffer.c
index 49c9aada0374b4c8b407d1110d37203f26339b62..d42162672c70e55e5c0913be839cd6f23e3413e9 100644 (file)
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -968,6 +968,7 @@ init_page_buffers(struct page *page, struct block_device *bdev,
        struct buffer_head *head = page_buffers(page);
        struct buffer_head *bh = head;
        int uptodate = PageUptodate(page);
+       sector_t end_block = blkdev_max_block(I_BDEV(bdev->bd_inode));
 
        do {
                if (!buffer_mapped(bh)) {
@@ -976,7 +977,8 @@ init_page_buffers(struct page *page, struct block_device *bdev,
                        bh->b_blocknr = block;
                        if (uptodate)
                                set_buffer_uptodate(bh);
-                       set_buffer_mapped(bh);
+                       if (block < end_block)
+                               set_buffer_mapped(bh);
                }
                block++;
                bh = bh->b_this_page;
@@ -1082,6 +1084,9 @@ grow_buffers(struct block_device *bdev, sector_t block, int size)
 static struct buffer_head *
 __getblk_slow(struct block_device *bdev, sector_t block, int size)
 {
+       int ret;
+       struct buffer_head *bh;
+
        /* Size must be multiple of hard sectorsize */
        if (unlikely(size & (bdev_logical_block_size(bdev)-1) ||
                        (size < 512 || size > PAGE_SIZE))) {
@@ -1094,20 +1099,21 @@ __getblk_slow(struct block_device *bdev, sector_t block, int size)
                return NULL;
        }
 
-       for (;;) {
-               struct buffer_head * bh;
-               int ret;
+retry:
+       bh = __find_get_block(bdev, block, size);
+       if (bh)
+               return bh;
 
+       ret = grow_buffers(bdev, block, size);
+       if (ret == 0) {
+               free_more_memory();
+               goto retry;
+       } else if (ret > 0) {
                bh = __find_get_block(bdev, block, size);
                if (bh)
                        return bh;
-
-               ret = grow_buffers(bdev, block, size);
-               if (ret < 0)
-                       return NULL;
-               if (ret == 0)
-                       free_more_memory();
        }
+       return NULL;
 }
 
 /*
@@ -1902,10 +1908,8 @@ int __block_write_begin(struct page *page, loff_t pos, unsigned len,
                if (!buffer_uptodate(*wait_bh))
                        err = -EIO;
        }
-       if (unlikely(err)) {
+       if (unlikely(err))
                page_zero_new_buffers(page, from, to);
-               ClearPageUptodate(page);
-       }
        return err;
 }
 EXPORT_SYMBOL(__block_write_begin);