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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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block/compat_ioctl.c
+2 -2
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@@ -744,13 +744,13 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
return 0;
case BLKGETSIZE:
size = bdev->bd_inode->i_size;
size = i_size_read(bdev->bd_inode);
if ((size >> 9) > ~0UL)
return -EFBIG;
return compat_put_ulong(arg, size >> 9);
case BLKGETSIZE64_32:
return compat_put_u64(arg, bdev->bd_inode->i_size);
return compat_put_u64(arg, i_size_read(bdev->bd_inode));
case BLKTRACESETUP32:
case BLKTRACESTART: /* compatible */