xiaomi-sm8450/android_kernel_xiaomi_sm8450
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ovl: treat special files like a regular fs

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No sense in opening special files on the underlying layers, they work just
as well if opened on the overlay.

Side effect is that it's no longer possible to connect one side of a pipe
opened on overlayfs with the other side opened on the underlying layer.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi
2016-12-16 11:02:55 +01:00
parent 6c02cb59e6
commit ca4c8a3a80
4 changed files with 16 additions and 19 deletions
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7
fs/overlayfs/super.c
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@@ -304,7 +304,7 @@ static struct dentry *ovl_d_real(struct dentry *dentry,
{
struct dentry *real;
if (d_is_dir(dentry)) {
if (!d_is_reg(dentry)) {
if (!inode || inode == d_inode(dentry))
return dentry;
goto bug;
@@ -575,7 +575,8 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
if (upperdentry && !d_is_dir(upperdentry)) {
inode = ovl_get_inode(dentry->d_sb, realinode);
} else {
inode = ovl_new_inode(dentry->d_sb, realinode->i_mode);
inode = ovl_new_inode(dentry->d_sb, realinode->i_mode,
realinode->i_rdev);
if (inode)
ovl_inode_init(inode, realinode, !!upperdentry);
}
@@ -1324,7 +1325,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
sb->s_fs_info = ufs;
sb->s_flags |= MS_POSIXACL | MS_NOREMOTELOCK;
root_dentry = d_make_root(ovl_new_inode(sb, S_IFDIR));
root_dentry = d_make_root(ovl_new_inode(sb, S_IFDIR, 0));
if (!root_dentry)
goto out_free_oe;