I found that in the latest version, the nodes of tracefs have been changed to dynamically created.
This has caused me to encounter a problem where the gid I specified in the mounting parameters cannot apply to all files, as in the following situation: /data/tmp/events # mount | grep tracefs tracefs on /data/tmp type tracefs (rw,seclabel,relatime,gid=3012) gid 3012 = readtracefs /data/tmp # ls -lh total 0 -r--r----- 1 root readtracefs 0 1970-01-01 08:00 README -r--r----- 1 root readtracefs 0 1970-01-01 08:00 available_events ums9621_1h10:/data/tmp/events # ls -lh total 0 drwxr-xr-x 2 root root 0 2023-12-19 00:56 alarmtimer drwxr-xr-x 2 root root 0 2023-12-19 00:56 asoc It will prevent certain applications from accessing tracefs properly, I try to avoid this issue by making the following modifications. Signed-off-by: Dongliang Cui <dongliang....@unisoc.com> --- fs/tracefs/inode.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/fs/tracefs/inode.c b/fs/tracefs/inode.c index ae648de..5296ff7 100644 --- a/fs/tracefs/inode.c +++ b/fs/tracefs/inode.c @@ -560,6 +560,16 @@ struct dentry *eventfs_failed_creating(struct dentry *dentry) */ struct dentry *eventfs_end_creating(struct dentry *dentry) { + struct tracefs_fs_info *fsi; + struct tracefs_mount_opts *opts; + + if (dentry && dentry->d_inode) { + fsi = dentry->d_inode->i_sb->s_fs_info; + opts = &fsi->mount_opts; + if (opts->opts & BIT(Opt_gid)) + change_gid(dentry, opts->gid); + } + return dentry; } -- 2.7.4