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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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3
fs/overlayfs/copy_up.c
View File

@ -417,8 +417,7 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
goto out_cleanup;
newdentry = dget(tmpfile ? upper : temp);
ovl_dentry_update(dentry, newdentry);
ovl_inode_update(d_inode(dentry), d_inode(newdentry));
ovl_inode_update(d_inode(dentry), newdentry);
/* Restore timestamps on parent (best effort) */
ovl_set_timestamps(upperdir, pstat);

8
fs/overlayfs/dir.c
View File

@ -154,12 +154,12 @@ static void ovl_instantiate(struct dentry *dentry, struct inode *inode,
struct dentry *newdentry, bool hardlink)
{
ovl_dentry_version_inc(dentry->d_parent);
ovl_dentry_update(dentry, newdentry);
if (!hardlink) {
ovl_inode_update(inode, d_inode(newdentry));
ovl_inode_update(inode, newdentry);
ovl_copyattr(newdentry->d_inode, inode);
} else {
WARN_ON(ovl_inode_real(inode, NULL) != d_inode(newdentry));
WARN_ON(ovl_inode_real(inode) != d_inode(newdentry));
dput(newdentry);
inc_nlink(inode);
}
d_instantiate(dentry, inode);
@ -1003,7 +1003,7 @@ static int ovl_rename(struct inode *olddir, struct dentry *old,
new_opaque = ovl_dentry_is_opaque(new);
err = -ESTALE;
if (ovl_dentry_upper(new)) {
if (d_inode(new) && ovl_dentry_upper(new)) {
if (opaquedir) {
if (newdentry != opaquedir)
goto out_dput;

26
fs/overlayfs/inode.c
View File

@ -134,8 +134,8 @@ out:
int ovl_permission(struct inode *inode, int mask)
{
bool is_upper;
struct inode *realinode = ovl_inode_real(inode, &is_upper);
struct inode *upperinode = ovl_inode_upper(inode);
struct inode *realinode = upperinode ?: ovl_inode_lower(inode);
const struct cred *old_cred;
int err;
@ -154,7 +154,8 @@ int ovl_permission(struct inode *inode, int mask)
return err;
old_cred = ovl_override_creds(inode->i_sb);
if (!is_upper && !special_file(realinode->i_mode) && mask & MAY_WRITE) {
if (!upperinode &&
!special_file(realinode->i_mode) && mask & MAY_WRITE) {
mask &= ~(MAY_WRITE | MAY_APPEND);
/* Make sure mounter can read file for copy up later */
mask |= MAY_READ;
@ -286,7 +287,7 @@ ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size)
struct posix_acl *ovl_get_acl(struct inode *inode, int type)
{
struct inode *realinode = ovl_inode_real(inode, NULL);
struct inode *realinode = ovl_inode_real(inode);
const struct cred *old_cred;
struct posix_acl *acl;
@ -462,17 +463,24 @@ static int ovl_inode_set(struct inode *inode, void *data)
return 0;
}
struct inode *ovl_get_inode(struct dentry *dentry)
struct inode *ovl_get_inode(struct dentry *dentry, struct dentry *upperdentry)
{
struct dentry *upperdentry = ovl_dentry_upper(dentry);
struct inode *realinode = d_inode(ovl_dentry_real(dentry));
struct dentry *lowerdentry = ovl_dentry_lower(dentry);
struct inode *realinode = upperdentry ? d_inode(upperdentry) : NULL;
struct inode *inode;
if (!realinode)
realinode = d_inode(lowerdentry);
if (upperdentry && !d_is_dir(upperdentry)) {
inode = iget5_locked(dentry->d_sb, (unsigned long) realinode,
ovl_inode_test, ovl_inode_set, realinode);
if (!inode || !(inode->i_state & I_NEW))
if (!inode)
goto out;
if (!(inode->i_state & I_NEW)) {
dput(upperdentry);
goto out;
}
set_nlink(inode, realinode->i_nlink);
} else {
@ -481,7 +489,7 @@ struct inode *ovl_get_inode(struct dentry *dentry)
goto out;
}
ovl_fill_inode(inode, realinode->i_mode, realinode->i_rdev);
ovl_inode_init(inode, dentry);
ovl_inode_init(inode, upperdentry, lowerdentry);
if (inode->i_state & I_NEW)
unlock_new_inode(inode);
out:

7
fs/overlayfs/namei.c
View File

@ -359,7 +359,7 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
return ERR_PTR(-ENAMETOOLONG);
old_cred = ovl_override_creds(dentry->d_sb);
upperdir = ovl_upperdentry_dereference(poe);
upperdir = ovl_dentry_upper(dentry->d_parent);
if (upperdir) {
err = ovl_lookup_layer(upperdir, &d, &upperdentry);
if (err)
@ -436,13 +436,12 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
oe->opaque = upperopaque;
oe->impure = upperimpure;
oe->redirect = upperredirect;
oe->__upperdentry = upperdentry;
memcpy(oe->lowerstack, stack, sizeof(struct path) * ctr);
dentry->d_fsdata = oe;
if (upperdentry || ctr) {
err = -ENOMEM;
inode = ovl_get_inode(dentry);
inode = ovl_get_inode(dentry, upperdentry);
if (!inode)
goto out_free_oe;
}
@ -487,7 +486,7 @@ bool ovl_lower_positive(struct dentry *dentry)
return oe->opaque;
/* Negative upper -> positive lower */
if (!oe->__upperdentry)
if (!ovl_dentry_upper(dentry))
return true;
/* Positive upper -> have to look up lower to see whether it exists */

12
fs/overlayfs/overlayfs.h
View File

@ -189,7 +189,9 @@ enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
struct dentry *ovl_dentry_upper(struct dentry *dentry);
struct dentry *ovl_dentry_lower(struct dentry *dentry);
struct dentry *ovl_dentry_real(struct dentry *dentry);
struct inode *ovl_inode_real(struct inode *inode, bool *is_upper);
struct inode *ovl_inode_upper(struct inode *inode);
struct inode *ovl_inode_lower(struct inode *inode);
struct inode *ovl_inode_real(struct inode *inode);
struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry);
void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache);
bool ovl_dentry_is_opaque(struct dentry *dentry);
@ -199,9 +201,9 @@ void ovl_dentry_set_opaque(struct dentry *dentry);
bool ovl_redirect_dir(struct super_block *sb);
const char *ovl_dentry_get_redirect(struct dentry *dentry);
void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect);
void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry);
void ovl_inode_init(struct inode *inode, struct dentry *dentry);
void ovl_inode_update(struct inode *inode, struct inode *upperinode);
void ovl_inode_init(struct inode *inode, struct dentry *upperdentry,
struct dentry *lowerdentry);
void ovl_inode_update(struct inode *inode, struct dentry *upperdentry);
void ovl_dentry_version_inc(struct dentry *dentry);
u64 ovl_dentry_version_get(struct dentry *dentry);
bool ovl_is_whiteout(struct dentry *dentry);
@ -250,7 +252,7 @@ int ovl_update_time(struct inode *inode, struct timespec *ts, int flags);
bool ovl_is_private_xattr(const char *name);
struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev);
struct inode *ovl_get_inode(struct dentry *dentry);
struct inode *ovl_get_inode(struct dentry *dentry, struct dentry *upperdentry);
static inline void ovl_copyattr(struct inode *from, struct inode *to)
{
to->i_uid = from->i_uid;

13
fs/overlayfs/ovl_entry.h
View File

@ -36,7 +36,6 @@ struct ovl_fs {
/* private information held for every overlayfs dentry */
struct ovl_entry {
struct dentry *__upperdentry;
struct ovl_dir_cache *cache;
union {
struct {
@ -54,14 +53,9 @@ struct ovl_entry {
struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
static inline struct dentry *ovl_upperdentry_dereference(struct ovl_entry *oe)
{
return lockless_dereference(oe->__upperdentry);
}
struct ovl_inode {
struct inode vfs_inode;
struct inode *upper;
struct dentry *__upperdentry;
struct inode *lower;
};
@ -69,3 +63,8 @@ static inline struct ovl_inode *OVL_I(struct inode *inode)
{
return container_of(inode, struct ovl_inode, vfs_inode);
}
static inline struct dentry *ovl_upperdentry_dereference(struct ovl_inode *oi)
{
return lockless_dereference(oi->__upperdentry);
}

15
fs/overlayfs/super.c
View File

@ -41,7 +41,6 @@ static void ovl_dentry_release(struct dentry *dentry)
if (oe) {
unsigned int i;
dput(oe->__upperdentry);
kfree(oe->redirect);
for (i = 0; i < oe->numlower; i++)
dput(oe->lowerstack[i].dentry);
@ -171,7 +170,7 @@ static struct inode *ovl_alloc_inode(struct super_block *sb)
{
struct ovl_inode *oi = kmem_cache_alloc(ovl_inode_cachep, GFP_KERNEL);
oi->upper = NULL;
oi->__upperdentry = NULL;
oi->lower = NULL;
return &oi->vfs_inode;
@ -186,6 +185,10 @@ static void ovl_i_callback(struct rcu_head *head)
static void ovl_destroy_inode(struct inode *inode)
{
struct ovl_inode *oi = OVL_I(inode);
dput(oi->__upperdentry);
call_rcu(&inode->i_rcu, ovl_i_callback);
}
@ -636,7 +639,7 @@ ovl_posix_acl_xattr_set(const struct xattr_handler *handler,
size_t size, int flags)
{
struct dentry *workdir = ovl_workdir(dentry);
struct inode *realinode = ovl_inode_real(inode, NULL);
struct inode *realinode = ovl_inode_real(inode);
struct posix_acl *acl = NULL;
int err;
@ -678,7 +681,7 @@ ovl_posix_acl_xattr_set(const struct xattr_handler *handler,
err = ovl_xattr_set(dentry, handler->name, value, size, flags);
if (!err)
ovl_copyattr(ovl_inode_real(inode, NULL), inode);
ovl_copyattr(ovl_inode_real(inode), inode);
return err;
@ -1000,7 +1003,6 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
kfree(lowertmp);
if (upperpath.dentry) {
oe->__upperdentry = upperpath.dentry;
oe->impure = ovl_is_impuredir(upperpath.dentry);
}
for (i = 0; i < numlower; i++) {
@ -1011,7 +1013,8 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
root_dentry->d_fsdata = oe;
ovl_inode_init(d_inode(root_dentry), root_dentry);
ovl_inode_init(d_inode(root_dentry), upperpath.dentry,
ovl_dentry_lower(root_dentry));
sb->s_root = root_dentry;

93
fs/overlayfs/util.c
View File

@ -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;