[Devel] [PATCH rh7 1/2] vfs: make guard_bh_eod() more generic

[Maxim Patlasov]

The patch backports commit 59d43914ed7b96255271ad6b7b735344beffa3c0 from mainline:

    vfs: make guard_bh_eod() more generic

    This patchset implements readpages() operation for block device by using
    mpage_readpages() which can create multipage BIOs instead of BIOs for each
    page and reduce system CPU time consumption.

    This patch (of 3):

    guard_bh_eod() is used in submit_bh() to allow us to do IO even on the odd
    last sectors of a device, even if the block size is some multiple of the
    physical sector size.  This makes guard_bh_eod() more generic and renames
    it guard_bio_eod() so that we can use it without struct buffer_head
    argument.

    The reason for this change is that using mpage_readpages() for block
    device requires to add this guard check in mpage code.

    Signed-off-by: Akinobu Mita <akinobu.mita at gmail.com>
    Cc: Jens Axboe <axboe at kernel.dk>
    Cc: Alexander Viro <viro at zeniv.linux.org.uk>
    Cc: Jeff Moyer <jmoyer at redhat.com>
    Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>

Signed-off-by: Maxim Patlasov <mpatlasov at virtuozzo.com>
---
 fs/buffer.c |   26 ++++++++++++--------------
 1 file changed, 12 insertions(+), 14 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index 2b709d4..a7cb15c 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2972,7 +2972,7 @@ static void end_bio_bh_io_sync(struct bio *bio, int err)
 
 /*
  * This allows us to do IO even on the odd last sectors
- * of a device, even if the bh block size is some multiple
+ * of a device, even if the block size is some multiple
  * of the physical sector size.
  *
  * We'll just truncate the bio to the size of the device,
@@ -2982,10 +2982,11 @@ static void end_bio_bh_io_sync(struct bio *bio, int err)
  * errors, this only handles the "we need to be able to
  * do IO at the final sector" case.
  */
-static void guard_bh_eod(int rw, struct bio *bio, struct buffer_head *bh)
+static void guard_bio_eod(int rw, struct bio *bio)
 {
 	sector_t maxsector;
-	unsigned bytes;
+	struct bio_vec *bvec = &bio->bi_io_vec[bio->bi_vcnt - 1];
+	unsigned truncated_bytes;
 
 	maxsector = i_size_read(bio->bi_bdev->bd_inode) >> 9;
 	if (!maxsector)
@@ -3000,23 +3001,20 @@ static void guard_bh_eod(int rw, struct bio *bio, struct buffer_head *bh)
 		return;
 
 	maxsector -= bio->bi_sector;
-	bytes = bio->bi_size;
-	if (likely((bytes >> 9) <= maxsector))
+	if (likely((bio->bi_size >> 9) <= maxsector))
 		return;
 
-	/* Uhhuh. We've got a bh that straddles the device size! */
-	bytes = maxsector << 9;
+	/* Uhhuh. We've got a bio that straddles the device size! */
+	truncated_bytes = bio->bi_size - (maxsector << 9);
 
 	/* Truncate the bio.. */
-	bio->bi_size = bytes;
-	bio->bi_io_vec[0].bv_len = bytes;
+	bio->bi_size -= truncated_bytes;
+	bvec->bv_len -= truncated_bytes;
 
 	/* ..and clear the end of the buffer for reads */
 	if ((rw & RW_MASK) == READ) {
-		void *kaddr = kmap_atomic(bh->b_page);
-		memset(kaddr + bh_offset(bh) + bytes, 0, bh->b_size - bytes);
-		kunmap_atomic(kaddr);
-		flush_dcache_page(bh->b_page);
+		zero_user(bvec->bv_page, bvec->bv_offset + bvec->bv_len,
+				truncated_bytes);
 	}
 }
 
@@ -3057,7 +3055,7 @@ int _submit_bh(int rw, struct buffer_head *bh, unsigned long bio_flags)
 	bio->bi_flags |= bio_flags;
 
 	/* Take care of bh's that straddle the end of the device */
-	guard_bh_eod(rw, bio, bh);
+	guard_bio_eod(rw, bio);
 
 	if (buffer_meta(bh))
 		rw |= REQ_META;