fs: don't flush pagecache when expanding block device
When changing the size of a block device, its all caches are freed. It's necessary on shrinking to prevent spurious I/Os to the disappeared region. However, on expanding, such kind of I/Os doesn't happen. Similar things can be considered for btrfs filesystem resize and resize2fs, but they are designed not to drop caches when expanding. Therefore this patch removes unnecessary cache drop. Link: http://lkml.kernel.org/r/1521457240-153390-1-git-send-email-shunki-fujita@cybozu.co.jp Signed-off-by: Shunki Fujita <shunki-fujita@cybozu.co.jp> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Jens Axboe <axboe@kernel.dk> Cc: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -1324,7 +1324,8 @@ static void flush_disk(struct block_device *bdev, bool kill_dirty)
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* @bdev: struct bdev to adjust.
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* @bdev: struct bdev to adjust.
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*
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*
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* This routine checks to see if the bdev size does not match the disk size
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* This routine checks to see if the bdev size does not match the disk size
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* and adjusts it if it differs.
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* and adjusts it if it differs. When shrinking the bdev size, its all caches
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* are freed.
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*/
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*/
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void check_disk_size_change(struct gendisk *disk, struct block_device *bdev)
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void check_disk_size_change(struct gendisk *disk, struct block_device *bdev)
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{
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{
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@ -1337,7 +1338,8 @@ void check_disk_size_change(struct gendisk *disk, struct block_device *bdev)
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"%s: detected capacity change from %lld to %lld\n",
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"%s: detected capacity change from %lld to %lld\n",
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disk->disk_name, bdev_size, disk_size);
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disk->disk_name, bdev_size, disk_size);
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i_size_write(bdev->bd_inode, disk_size);
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i_size_write(bdev->bd_inode, disk_size);
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flush_disk(bdev, false);
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if (bdev_size > disk_size)
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flush_disk(bdev, false);
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}
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}
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}
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}
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EXPORT_SYMBOL(check_disk_size_change);
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EXPORT_SYMBOL(check_disk_size_change);
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