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block: read i_size with i_size_read()

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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 <[email protected]>
Acked-by: NeilBrown <[email protected]>
Acked-by: Lars Ellenberg <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Mike Snitzer 2010-11-08 14:39:12 +01:00 • committed by Jens Axboe
commit 77304d2aba
5 changed files with 18 additions and 18 deletions
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2
drivers/block/drbd/drbd_int.h
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@ -1874,7 +1874,7 @@ static inline sector_t drbd_md_last_sector(struct drbd_backing_dev *bdev)
static inline sector_t drbd_get_capacity(struct block_device *bdev)
{
/* return bdev ? get_capacity(bdev->bd_disk) : 0; */
return bdev ? bdev->bd_inode->i_size >> 9 : 0;
return bdev ? i_size_read(bdev->bd_inode) >> 9 : 0;
}
/**