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ext4: Adjust minlen with discard_granularity in the FITRIM ioctl

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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>
This commit is contained in:
Lukas Czerner 2011-02-23 17:49:51 -05:00 committed by Theodore Ts'o
parent 4143179218
commit 5c2ed62fd4
1 changed files with 2 additions and 0 deletions
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fs/ext4/ioctl.c
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@ -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;