static struct dentry *aufs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
struct dentry *ret, *parent;
struct inode *inode;
struct super_block *sb;
int err, npositive;
IMustLock(dir);
sb = dir->i_sb;
si_read_lock(sb, AuLock_FLUSH);
ret = ERR_PTR(-ENAMETOOLONG);
if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
goto out;
err = au_di_init(dentry);
ret = ERR_PTR(err);
if (unlikely(err))
goto out;
parent = dentry->d_parent; /* dir inode is locked */
di_read_lock_parent(parent, AuLock_IR);
npositive = au_lkup_dentry(dentry, au_dbstart(parent), /*type*/0, nd);
di_read_unlock(parent, AuLock_IR);
err = npositive;
ret = ERR_PTR(err);
if (unlikely(err < 0))
goto out_unlock;
inode = NULL;
if (npositive) {
inode = au_new_inode(dentry, /*must_new*/0);
ret = (void *)inode;
}
if (IS_ERR(inode))
goto out_unlock;
ret = d_splice_alias(inode, dentry);
if (unlikely(IS_ERR(ret) && inode))
ii_write_unlock(inode);
out_unlock:
di_write_unlock(dentry);
out:
si_read_unlock(sb);
return ret;
}
static struct dentry *aufs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
struct dentry *ret, *parent;
struct inode *inode;
struct super_block *sb;
int err, npositive, lc_idx;
IMustLock(dir);
sb = dir->i_sb;
err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
ret = ERR_PTR(err);
if (unlikely(err))
goto out;
ret = ERR_PTR(-ENAMETOOLONG);
if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
goto out_si;
err = au_di_init(dentry);
ret = ERR_PTR(err);
if (unlikely(err))
goto out_si;
inode = NULL;
npositive = 0; /* suppress a warning */
parent = dentry->d_parent; /* dir inode is locked */
di_read_lock_parent(parent, AuLock_IR);
err = au_alive_dir(parent);
if (!err)
err = au_digen_test(parent, au_sigen(sb));
if (!err) {
npositive = au_lkup_dentry(dentry, au_dbstart(parent),
/*type*/0, nd);
err = npositive;
}
di_read_unlock(parent, AuLock_IR);
ret = ERR_PTR(err);
if (unlikely(err < 0))
goto out_unlock;
if (npositive) {
inode = au_new_inode(dentry, /*must_new*/0);
ret = (void *)inode;
}
if (IS_ERR(inode)) {
inode = NULL;
goto out_unlock;
}
ret = d_splice_alias(inode, dentry);
if (unlikely(IS_ERR(ret) && inode)) {
ii_write_unlock(inode);
lc_idx = AuLcNonDir_IIINFO;
if (S_ISLNK(inode->i_mode))
lc_idx = AuLcSymlink_IIINFO;
else if (S_ISDIR(inode->i_mode))
lc_idx = AuLcDir_IIINFO;
au_rw_class(&au_ii(inode)->ii_rwsem, au_lc_key + lc_idx);
iput(inode);
}
out_unlock:
di_write_unlock(dentry);
if (unlikely(IS_ERR(ret) && inode)) {
lc_idx = AuLcNonDir_DIINFO;
if (S_ISLNK(inode->i_mode))
lc_idx = AuLcSymlink_DIINFO;
else if (S_ISDIR(inode->i_mode))
lc_idx = AuLcDir_DIINFO;
au_rw_class(&au_di(dentry)->di_rwsem, au_lc_key + lc_idx);
}
out_si:
si_read_unlock(sb);
out:
return ret;
}
static struct dentry *aufs_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
struct dentry *ret, *parent;
struct inode *inode;
struct super_block *sb;
int err, npositive;
IMustLock(dir);
/* todo: support rcu-walk? */
ret = ERR_PTR(-ECHILD);
if (flags & LOOKUP_RCU)
goto out;
ret = ERR_PTR(-ENAMETOOLONG);
if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
goto out;
sb = dir->i_sb;
err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
ret = ERR_PTR(err);
if (unlikely(err))
goto out;
err = au_di_init(dentry);
ret = ERR_PTR(err);
if (unlikely(err))
goto out_si;
inode = NULL;
npositive = 0; /* suppress a warning */
parent = dentry->d_parent; /* dir inode is locked */
di_read_lock_parent(parent, AuLock_IR);
err = au_alive_dir(parent);
if (!err)
err = au_digen_test(parent, au_sigen(sb));
if (!err) {
/* regardless LOOKUP_CREATE, always ALLOW_NEG */
npositive = au_lkup_dentry(dentry, au_dbtop(parent),
AuLkup_ALLOW_NEG);
err = npositive;
}
di_read_unlock(parent, AuLock_IR);
ret = ERR_PTR(err);
if (unlikely(err < 0))
goto out_unlock;
if (npositive) {
inode = au_new_inode(dentry, /*must_new*/0);
if (IS_ERR(inode)) {
ret = (void *)inode;
inode = NULL;
goto out_unlock;
}
}
if (inode)
atomic_inc(&inode->i_count);
ret = d_splice_alias(inode, dentry);
#if 0
if (unlikely(d_need_lookup(dentry))) {
spin_lock(&dentry->d_lock);
dentry->d_flags &= ~DCACHE_NEED_LOOKUP;
spin_unlock(&dentry->d_lock);
} else
#endif
if (inode) {
if (!IS_ERR(ret)) {
iput(inode);
if (ret && ret != dentry)
ii_write_unlock(inode);
} else {
ii_write_unlock(inode);
iput(inode);
inode = NULL;
}
}
out_unlock:
di_write_unlock(dentry);
out_si:
si_read_unlock(sb);
out:
return ret;
}
static struct dentry *aufs_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
struct dentry *ret, *parent;
struct inode *inode;
struct super_block *sb;
int err, npositive;
IMustLock(dir);
/* todo: support rcu-walk? */
ret = ERR_PTR(-ECHILD);
if (flags & LOOKUP_RCU)
goto out;
ret = ERR_PTR(-ENAMETOOLONG);
if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
goto out;
sb = dir->i_sb;
err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
ret = ERR_PTR(err);
if (unlikely(err))
goto out;
err = au_di_init(dentry);
ret = ERR_PTR(err);
if (unlikely(err))
goto out_si;
inode = NULL;
npositive = 0; /* suppress a warning */
parent = dentry->d_parent; /* dir inode is locked */
di_read_lock_parent(parent, AuLock_IR);
err = au_alive_dir(parent);
if (!err)
err = au_digen_test(parent, au_sigen(sb));
if (!err) {
npositive = au_lkup_dentry(dentry, au_dbstart(parent),
/*type*/0);
err = npositive;
}
di_read_unlock(parent, AuLock_IR);
ret = ERR_PTR(err);
if (unlikely(err < 0))
goto out_unlock;
if (npositive) {
inode = au_new_inode(dentry, /*must_new*/0);
if (IS_ERR(inode)) {
ret = (void *)inode;
inode = NULL;
goto out_unlock;
}
}
if (inode)
atomic_inc(&inode->i_count);
ret = d_splice_alias(inode, dentry);
#if 0
if (unlikely(d_need_lookup(dentry))) {
spin_lock(&dentry->d_lock);
dentry->d_flags &= ~DCACHE_NEED_LOOKUP;
spin_unlock(&dentry->d_lock);
} else
#endif
if (inode) {
if (!IS_ERR(ret)) {
iput(inode);
if (ret && ret != dentry)
ii_write_unlock(inode);
} else {
ii_write_unlock(inode);
iput(inode);
inode = NULL;
}
}
out_unlock:
di_write_unlock(dentry);
if (inode) {
/* verbose coding for lock class name */
if (unlikely(S_ISLNK(inode->i_mode)))
au_rw_class(&au_di(dentry)->di_rwsem,
au_lc_key + AuLcSymlink_DIINFO);
else if (unlikely(S_ISDIR(inode->i_mode)))
au_rw_class(&au_di(dentry)->di_rwsem,
au_lc_key + AuLcDir_DIINFO);
else /* likely */
au_rw_class(&au_di(dentry)->di_rwsem,
au_lc_key + AuLcNonDir_DIINFO);
}
out_si:
si_read_unlock(sb);
out:
return ret;
}
