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ovl: move __upperdentry to ovl_inode

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Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi
2017-07-04 22:03:16 +02:00
parent 9020df3720
commit 09d8b58673
8 changed files with 81 additions and 96 deletions
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93
fs/overlayfs/util.c
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@@ -78,7 +78,7 @@ enum ovl_path_type ovl_path_type(struct dentry *dentry)
struct ovl_entry *oe = dentry->d_fsdata;
enum ovl_path_type type = 0;
if (oe->__upperdentry) {
if (ovl_dentry_upper(dentry)) {
type = __OVL_PATH_UPPER;
/*
@@ -99,10 +99,9 @@ enum ovl_path_type ovl_path_type(struct dentry *dentry)
void ovl_path_upper(struct dentry *dentry, struct path *path)
{
struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
struct ovl_entry *oe = dentry->d_fsdata;
path->mnt = ofs->upper_mnt;
path->dentry = ovl_upperdentry_dereference(oe);
path->dentry = ovl_dentry_upper(dentry);
}
void ovl_path_lower(struct dentry *dentry, struct path *path)
@@ -126,51 +125,39 @@ enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path)
struct dentry *ovl_dentry_upper(struct dentry *dentry)
{
struct ovl_entry *oe = dentry->d_fsdata;
return ovl_upperdentry_dereference(oe);
}
static struct dentry *__ovl_dentry_lower(struct ovl_entry *oe)
{
return oe->numlower ? oe->lowerstack[0].dentry : NULL;
return ovl_upperdentry_dereference(OVL_I(d_inode(dentry)));
}
struct dentry *ovl_dentry_lower(struct dentry *dentry)
{
struct ovl_entry *oe = dentry->d_fsdata;
return __ovl_dentry_lower(oe);
return oe->numlower ? oe->lowerstack[0].dentry : NULL;
}
struct dentry *ovl_dentry_real(struct dentry *dentry)
{
struct ovl_entry *oe = dentry->d_fsdata;
struct dentry *realdentry;
realdentry = ovl_upperdentry_dereference(oe);
if (!realdentry)
realdentry = __ovl_dentry_lower(oe);
return realdentry;
return ovl_dentry_upper(dentry) ?: ovl_dentry_lower(dentry);
}
struct inode *ovl_inode_real(struct inode *inode, bool *is_upper)
struct inode *ovl_inode_upper(struct inode *inode)
{
struct inode *realinode = lockless_dereference(OVL_I(inode)->upper);
bool isup = false;
struct dentry *upperdentry = ovl_upperdentry_dereference(OVL_I(inode));
if (!realinode)
realinode = OVL_I(inode)->lower;
else
isup = true;
if (is_upper)
*is_upper = isup;
return realinode;
return upperdentry ? d_inode(upperdentry) : NULL;
}
struct inode *ovl_inode_lower(struct inode *inode)
{
return OVL_I(inode)->lower;
}
struct inode *ovl_inode_real(struct inode *inode)
{
return ovl_inode_upper(inode) ?: ovl_inode_lower(inode);
}
struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry)
{
struct ovl_entry *oe = dentry->d_fsdata;
@@ -232,42 +219,30 @@ void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect)
oe->redirect = redirect;
}
void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry)
void ovl_inode_init(struct inode *inode, struct dentry *upperdentry,
struct dentry *lowerdentry)
{
struct ovl_entry *oe = dentry->d_fsdata;
if (upperdentry)
OVL_I(inode)->__upperdentry = upperdentry;
if (lowerdentry)
OVL_I(inode)->lower = d_inode(lowerdentry);
WARN_ON(!inode_is_locked(upperdentry->d_parent->d_inode));
WARN_ON(oe->__upperdentry);
/*
* Make sure upperdentry is consistent before making it visible to
* ovl_upperdentry_dereference().
*/
smp_wmb();
oe->__upperdentry = upperdentry;
ovl_copyattr(d_inode(upperdentry ?: lowerdentry), inode);
}
void ovl_inode_init(struct inode *inode, struct dentry *dentry)
void ovl_inode_update(struct inode *inode, struct dentry *upperdentry)
{
struct inode *realinode = d_inode(ovl_dentry_real(dentry));
struct inode *upperinode = d_inode(upperdentry);
if (ovl_dentry_upper(dentry))
OVL_I(inode)->upper = realinode;
else
OVL_I(inode)->lower = realinode;
ovl_copyattr(realinode, inode);
}
void ovl_inode_update(struct inode *inode, struct inode *upperinode)
{
WARN_ON(!upperinode);
WARN_ON(!inode_unhashed(inode));
WARN_ON(!inode_is_locked(upperdentry->d_parent->d_inode));
WARN_ON(OVL_I(inode)->__upperdentry);
/*
* Make sure upperinode is consistent before making it visible to
* ovl_inode_real();
* Make sure upperdentry is consistent before making it visible
*/
smp_wmb();
OVL_I(inode)->upper = upperinode;
OVL_I(inode)->__upperdentry = upperdentry;
if (!S_ISDIR(upperinode->i_mode)) {
inode->i_private = upperinode;
__insert_inode_hash(inode, (unsigned long) upperinode);
@@ -311,7 +286,7 @@ int ovl_copy_up_start(struct dentry *dentry)
spin_lock(&ofs->copyup_wq.lock);
err = wait_event_interruptible_locked(ofs->copyup_wq, !oe->copying);
if (!err) {
if (oe->__upperdentry)
if (ovl_dentry_upper(dentry))
err = 1; /* Already copied up */
else
oe->copying = true;