End of device check is done twice in __generic_make_request() and it's
fully inlined each time.  Factor out bio_check_eod().

This is taken from Jens' zero-length barrier patch.

Signed-off-by: Tejun Heo <[EMAIL PROTECTED]>
Cc: Jens Axboe <[EMAIL PROTECTED]>
---
 block/ll_rw_blk.c |   63 ++++++++++++++++++++++++++++--------------------------
 1 file changed, 33 insertions(+), 30 deletions(-)

Index: work/block/ll_rw_blk.c
===================================================================
--- work.orig/block/ll_rw_blk.c
+++ work/block/ll_rw_blk.c
@@ -3094,6 +3094,35 @@ static inline int should_fail_request(st
 
 #endif /* CONFIG_FAIL_MAKE_REQUEST */
 
+/*
+ * Check whether this bio extends beyond the end of the device.
+ */
+static int bio_check_eod(struct bio *bio, unsigned int nr_sectors)
+{
+       sector_t maxsector;
+
+       if (!nr_sectors)
+               return 0;
+
+       /* Test device or partition size, when known. */
+       maxsector = bio->bi_bdev->bd_inode->i_size >> 9;
+       if (maxsector) {
+               sector_t sector = bio->bi_sector;
+
+               if (maxsector < nr_sectors || maxsector - nr_sectors < sector) {
+                       /*
+                        * This may well happen - the kernel calls bread()
+                        * without checking the size of the device, e.g., when
+                        * mounting a device.
+                        */
+                       handle_bad_sector(bio);
+                       return 1;
+               }
+       }
+
+       return 0;
+}
+
 /**
  * generic_make_request: hand a buffer to its device driver for I/O
  * @bio:  The bio describing the location in memory and on the device.
@@ -3121,27 +3150,14 @@ static inline int should_fail_request(st
 static inline void __generic_make_request(struct bio *bio)
 {
        request_queue_t *q;
-       sector_t maxsector;
        sector_t old_sector;
        int ret, nr_sectors = bio_sectors(bio);
        dev_t old_dev;
 
        might_sleep();
-       /* Test device or partition size, when known. */
-       maxsector = bio->bi_bdev->bd_inode->i_size >> 9;
-       if (maxsector) {
-               sector_t sector = bio->bi_sector;
 
-               if (maxsector < nr_sectors || maxsector - nr_sectors < sector) {
-                       /*
-                        * This may well happen - the kernel calls bread()
-                        * without checking the size of the device, e.g., when
-                        * mounting a device.
-                        */
-                       handle_bad_sector(bio);
-                       goto end_io;
-               }
-       }
+       if (bio_check_eod(bio, nr_sectors))
+               goto end_io;
 
        /*
         * Resolve the mapping until finished. (drivers are
@@ -3197,21 +3213,8 @@ end_io:
                old_sector = bio->bi_sector;
                old_dev = bio->bi_bdev->bd_dev;
 
-               maxsector = bio->bi_bdev->bd_inode->i_size >> 9;
-               if (maxsector) {
-                       sector_t sector = bio->bi_sector;
-
-                       if (maxsector < nr_sectors ||
-                                       maxsector - nr_sectors < sector) {
-                               /*
-                                * This may well happen - partitions are not
-                                * checked to make sure they are within the size
-                                * of the whole device.
-                                */
-                               handle_bad_sector(bio);
-                               goto end_io;
-                       }
-               }
+               if (bio_check_eod(bio, nr_sectors))
+                       goto end_io;
 
                ret = q->make_request_fn(q, bio);
        } while (ret);
-
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