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Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs 

Pull overlayfs fixes from Miklos Szeredi:
 "Overlayfs bug fixes.  All marked as -stable material"

* 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs:
  ovl: copy new uid/gid into overlayfs runtime inode
  ovl: ignore lower entries when checking purity of non-directory entries
  ovl: fix getcwd() failure after unsuccessful rmdir
  ovl: fix working on distributed fs as lower layer
This commit is contained in:
Linus Torvalds 2016-03-07 15:23:25 -08:00
parent 256faedcfd b81de061fa
commit 01ffa3df22
3 changed files with 19 additions and 6 deletions
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10
fs/overlayfs/dir.c
View File

@ -618,7 +618,8 @@ static int ovl_remove_upper(struct dentry *dentry, bool is_dir)
* sole user of this dentry. Too tricky... Just unhash for
* now.
*/
d_drop(dentry);
if (!err)
d_drop(dentry);
inode_unlock(dir);
return err;
@ -903,6 +904,13 @@ static int ovl_rename2(struct inode *olddir, struct dentry *old,
if (!overwrite && new_is_dir && !old_opaque && new_opaque)
ovl_remove_opaque(newdentry);
/*
* Old dentry now lives in different location. Dentries in
* lowerstack are stale. We cannot drop them here because
* access to them is lockless. This could be only pure upper
* or opaque directory - numlower is zero. Or upper non-dir
* entry - its pureness is tracked by flag opaque.
*/
if (old_opaque != new_opaque) {
ovl_dentry_set_opaque(old, new_opaque);
if (!overwrite)

2
fs/overlayfs/inode.c
View File

@ -65,6 +65,8 @@ int ovl_setattr(struct dentry *dentry, struct iattr *attr)
inode_lock(upperdentry->d_inode);
err = notify_change(upperdentry, attr, NULL);
if (!err)
ovl_copyattr(upperdentry->d_inode, dentry->d_inode);
inode_unlock(upperdentry->d_inode);
}
ovl_drop_write(dentry);

13
fs/overlayfs/super.c
View File

@ -76,12 +76,14 @@ enum ovl_path_type ovl_path_type(struct dentry *dentry)
if (oe->__upperdentry) {
type = __OVL_PATH_UPPER;
if (oe->numlower) {
if (S_ISDIR(dentry->d_inode->i_mode))
type |= __OVL_PATH_MERGE;
} else if (!oe->opaque) {
/*
* Non-dir dentry can hold lower dentry from previous
* location. Its purity depends only on opaque flag.
*/
if (oe->numlower && S_ISDIR(dentry->d_inode->i_mode))
type |= __OVL_PATH_MERGE;
else if (!oe->opaque)
type |= __OVL_PATH_PURE;
}
} else {
if (oe->numlower > 1)
type |= __OVL_PATH_MERGE;
@ -341,6 +343,7 @@ static const struct dentry_operations ovl_dentry_operations = {
static const struct dentry_operations ovl_reval_dentry_operations = {
.d_release = ovl_dentry_release,
.d_select_inode = ovl_d_select_inode,
.d_revalidate = ovl_dentry_revalidate,
.d_weak_revalidate = ovl_dentry_weak_revalidate,
};