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ceph: fix duplicate increment of opened_inodes metric

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[ Upstream commit 973e5245637accc4002843f6b888495a6a7762bc ]

opened_inodes is incremented twice when the same inode is opened twice
with O_RDONLY and O_WRONLY respectively.

To reproduce, run this python script, then check the metrics:

import os
for _ in range(10000):
    fd_r = os.open('a', os.O_RDONLY)
    fd_w = os.open('a', os.O_WRONLY)
    os.close(fd_r)
    os.close(fd_w)

Fixes: 1dd8d4708136 ("ceph: metrics for opened files, pinned caps and opened inodes")
Signed-off-by: Hu Weiwen <sehuww@mail.scut.edu.cn>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hu Weiwen 2021-11-22 22:22:12 +08:00 committed by Greg Kroah-Hartman
parent 832f3655c6
commit 24a19e6d65
1 changed files with 8 additions and 8 deletions
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16
fs/ceph/caps.c
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@ -4349,7 +4349,7 @@ void ceph_get_fmode(struct ceph_inode_info *ci, int fmode, int count)
{
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(ci->vfs_inode.i_sb);
int bits = (fmode << 1) | 1;
bool is_opened = false;
bool already_opened = false;
int i;
if (count == 1)
@ -4357,19 +4357,19 @@ void ceph_get_fmode(struct ceph_inode_info *ci, int fmode, int count)
spin_lock(&ci->i_ceph_lock);
for (i = 0; i < CEPH_FILE_MODE_BITS; i++) {
if (bits & (1 << i))
ci->i_nr_by_mode[i] += count;
/*
* If any of the mode ref is larger than 1,
* If any of the mode ref is larger than 0,
* that means it has been already opened by
* others. Just skip checking the PIN ref.
*/
if (i && ci->i_nr_by_mode[i] > 1)
is_opened = true;
if (i && ci->i_nr_by_mode[i])
already_opened = true;
if (bits & (1 << i))
ci->i_nr_by_mode[i] += count;
}
if (!is_opened)
if (!already_opened)
percpu_counter_inc(&mdsc->metric.opened_inodes);
spin_unlock(&ci->i_ceph_lock);
}