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| author | Hu Weiwen <sehuww@mail.scut.edu.cn> | 2021-11-22 17:22:12 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-22 11:32:38 +0300 |
| commit | 24a19e6d6518e15c4e0cb97c32dd7c568c0f5564 (patch) | |
| tree | b18e08e907360f05a7e19e0d0270ab56c3cbfce4 /fs/ceph | |
| parent | 832f3655c6138c23576ed268e31cc76e0f05f2b1 (diff) | |
| download | linux-24a19e6d6518e15c4e0cb97c32dd7c568c0f5564.tar.xz | |
ceph: fix duplicate increment of opened_inodes metric
[ 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>
Diffstat (limited to 'fs/ceph')
| -rw-r--r-- | fs/ceph/caps.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index 8f537f1d9d1d..8be4da2e2b82 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -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); } |