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ovl: ovl_obtain_alias(): don't call d_instantiate_anon() for old 

The situation is the same as for __d_obtain_alias() (which is what that
thing is parallel to) - if we find a preexisting alias, we want to grab it,
drop the inode and return the alias we'd found.

The only thing d_instantiate_anon() does compared to that is spurious
security_d_instiate() that has already been done to that dentry with exact
same arguments.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Al Viro 2019-10-24 02:06:45 +01:00 committed by Miklos Szeredi
parent d80172c2d8
commit 504f38410a
1 changed files with 20 additions and 16 deletions
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36
fs/overlayfs/export.c
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@ -308,31 +308,35 @@ static struct dentry *ovl_obtain_alias(struct super_block *sb,
ovl_set_flag(OVL_UPPERDATA, inode);
dentry = d_find_any_alias(inode);
if (!dentry) {
dentry = d_alloc_anon(inode->i_sb);
if (!dentry)
goto nomem;
oe = ovl_alloc_entry(lower ? 1 : 0);
if (!oe)
goto nomem;
if (dentry)
goto out_iput;
if (lower) {
oe->lowerstack->dentry = dget(lower);
oe->lowerstack->layer = lowerpath->layer;
}
dentry->d_fsdata = oe;
if (upper_alias)
ovl_dentry_set_upper_alias(dentry);
dentry = d_alloc_anon(inode->i_sb);
if (unlikely(!dentry))
goto nomem;
oe = ovl_alloc_entry(lower ? 1 : 0);
if (!oe)
goto nomem;
if (lower) {
oe->lowerstack->dentry = dget(lower);
oe->lowerstack->layer = lowerpath->layer;
}
dentry->d_fsdata = oe;
if (upper_alias)
ovl_dentry_set_upper_alias(dentry);
ovl_dentry_update_reval(dentry, upper,
DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE);
return d_instantiate_anon(dentry, inode);
nomem:
iput(inode);
dput(dentry);
return ERR_PTR(-ENOMEM);
dentry = ERR_PTR(-ENOMEM);
out_iput:
iput(inode);
return dentry;
}
/* Get the upper or lower dentry in stach whose on layer @idx */