Commit 5c2ed62f authored Feb 23, 2011 by Lukas Czerner Committed by Theodore Ts'o Feb 23, 2011

ext4: Adjust minlen with discard_granularity in the FITRIM ioctl

Discard granularity tells us the minimum size of extent that can be
discarded by the device. If the user supplies a minimum extent that
should be discarded (range.minlen) which is smaller than the discard
granularity, increase minlen to the discard granularity, since there's
no point submitting trim requests that the device will reject anyway.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

parent 41431792

fs/ext4/ioctl.c

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -348,6 +348,8 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
	sizeof(range)))		sizeof(range)))
	return -EFAULT;		return -EFAULT;

			range.minlen = max((unsigned int)range.minlen,
			q->limits.discard_granularity);
	ret = ext4_trim_fs(sb, &range);		ret = ext4_trim_fs(sb, &range);
	if (ret < 0)		if (ret < 0)
	return ret;		return ret;