block: read i_size with i_size_read()

Convert direct reads of an inode's i_size to using i_size_read().

i_size_{read,write} use a seqcount to protect reads from accessing
incomple writes.  Concurrent i_size_write()s require mutual exclussion
to protect the seqcount that is used by i_size_{read,write}.  But
i_size_read() callers do not need to use additional locking.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: NeilBrown <neilb@suse.de>
Acked-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/block/blk-core.c b/block/blk-core.c
index f0834e2f5727..17fcb83670c0 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1351,7 +1351,7 @@ static void handle_bad_sector(struct bio *bio)
                         bdevname(bio->bi_bdev, b),
                         bio->bi_rw,
                         (unsigned long long)bio->bi_sector + bio_sectors(bio),
-                        (long long)(bio->bi_bdev->bd_inode->i_size >> 9));
+                        (long long)(i_size_read(bio->bi_bdev->bd_inode) >> 9));
 
         set_bit(BIO_EOF, &bio->bi_flags);
 }
@@ -1404,7 +1404,7 @@ static inline int bio_check_eod(struct bio *bio, unsigned int nr_sectors)
                 return 0;
 
         /* Test device or partition size, when known. */
-        maxsector = bio->bi_bdev->bd_inode->i_size >> 9;
+        maxsector = i_size_read(bio->bi_bdev->bd_inode) >> 9;
         if (maxsector) {
                 sector_t sector = bio->bi_sector;