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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 <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>
This commit is contained in:
Mike Snitzer
2010-11-08 14:39:12 +01:00
committed by Jens Axboe
parent 90fdb0b98a
commit 77304d2aba
5 changed files with 18 additions and 18 deletions
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6
block/ioctl.c
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@@ -125,7 +125,7 @@ static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
start >>= 9;
len >>= 9;
if (start + len > (bdev->bd_inode->i_size >> 9))
if (start + len > (i_size_read(bdev->bd_inode) >> 9))
return -EINVAL;
if (secure)
flags |= BLKDEV_DISCARD_SECURE;
@@ -307,12 +307,12 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
ret = blkdev_reread_part(bdev);
break;
case BLKGETSIZE:
size = bdev->bd_inode->i_size;
size = i_size_read(bdev->bd_inode);
if ((size >> 9) > ~0UL)
return -EFBIG;
return put_ulong(arg, size >> 9);
case BLKGETSIZE64:
return put_u64(arg, bdev->bd_inode->i_size);
return put_u64(arg, i_size_read(bdev->bd_inode));
case BLKTRACESTART:
case BLKTRACESTOP:
case BLKTRACESETUP: