Guan Xin:
> Now I removed (commented out) that lazy umount.
> My mounts looks like this and the error persists:
>
> rootfs / rootfs rw 0 0
> proc /proc proc rw,relatime 0 0
> sysfs /sys sysfs rw,relatime 0 0
> tmpfs /run tmpfs rw,relatime,mode=755 0 0
> devtmpfs /dev devtmpfs rw,relatime,size=1020396k,nr_inodes=220181,mode=755 0 0
> /dev/loop0 /mnt0 squashfs ro,relatime 0 0
> tmpfs /mnt1 tmpfs rw,relatime,size=20971520k 0 0
> /dev/sda1 /mnt2 ext2 ro,relatime,errors=continue,user_xattr,acl 0 0
> aufs / aufs rw,relatime,si=bdb9caa6 0 0
> devpts /dev/pts devpts rw,relatime,gid=5,mode=620,ptmxmode=000 0 0
> cgroup /sys/fs/cgroup cgroup
> rw,relatime,perf_event,blkio,net_cls,freezer,devices,cpuacct,cpu,cpuset
> 0 0
> fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
> /dev/sda1 /boot ext2 ro,relatime,errors=continue,user_xattr,acl 0 0
> /dev/sdb2 /home ext4 rw,relatime,data=ordered 0 0
> /dev/sdb4 /usr/src ext4 ro,relatime,data=ordered 0 0
> tmpfs /dev/shm tmpfs rw,relatime 0 0
Hmm...
Just to make sure, you can success chdir("/mnt[012]/home/username"), right?
Will you show me the output of this command?
$ ls -ld / /mnt[012] /mnt[012]/home /mnt[012]/home/username /home /home/username
chdir(2) essentially calls two kernel internal functions,
user_path_dir() and inode_permission(). Can you distinguish which one
returns EACCES by ftrace or something? If not, will you try this patch
which is just for debug print?
diff --git a/fs/open.c b/fs/open.c
index 7e4c856..26e682e 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -382,12 +382,18 @@ SYSCALL_DEFINE1(chdir, const char __user *, filename)
int error;
error = user_path_dir(filename, &path);
- if (error)
+ if (error) {
+ pr_err("%s:%d: %d\n", __func__, __LINE__, error);
goto out;
+ }
error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR);
- if (error)
+ if (error) {
+ pr_err("%s:%d: %.*s, %d\n", __func__, __LINE__,
+ path.dentry->d_name.len, path.dentry->d_name.name,
+ error);
goto dput_and_out;
+ }
set_fs_pwd(current->fs, &path);
J. R. Okajima
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