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ceph: reduce i_nr_by_mode array size

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Track usage count for individual fmode bit. This can reduce the
array size by half.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng
2016-06-06 16:01:39 +08:00
committed by Ilya Dryomov
parent a22bd5ffae
commit 774a6a118c
5 changed files with 36 additions and 23 deletions
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3
fs/ceph/ioctl.c
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@@ -250,9 +250,8 @@ static long ceph_ioctl_lazyio(struct file *file)
if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
spin_lock(&ci->i_ceph_lock);
ci->i_nr_by_mode[fi->fmode]--;
fi->fmode |= CEPH_FILE_MODE_LAZY;
ci->i_nr_by_mode[fi->fmode]++;
ci->i_nr_by_mode[ffs(CEPH_FILE_MODE_LAZY)]++;
spin_unlock(&ci->i_ceph_lock);
dout("ioctl_layzio: file %p marked lazy\n", file);