From: Hu Weiwen sehuww@mail.scut.edu.cn
stable inclusion from stable-v5.10.88 commit e0f06c32afb24d6bcb024334ff8c392221a312e2 bugzilla: 186058 https://gitee.com/openeuler/kernel/issues/I4QW6A
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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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 Signed-off-by: Chen Jun chenjun102@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- fs/ceph/caps.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index 676f55195306..d3f67271d3c7 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -4359,7 +4359,7 @@ 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) @@ -4367,19 +4367,19 @@ 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); }