static stm_blk * _successor_non_stm(ptst_t *ptst, stm_tx *tx, stm_blk * tb) {
stm_blk *chb, *pb, *plb;
node_t *t, *ch, *p;
if(tb == NULL) {
return NULL;
} else {
t = init_stm_blk__(ptst, MEMORY, tb);
if(GET_RIGHT(t) != NULL) {
pb = GET_RIGHT(t);
p = init_stm_blk__(ptst, MEMORY, pb);
while ( (plb=GET_LEFT(p)) != NULL ) {
pb = plb;
p = init_stm_blk__(ptst, MEMORY, pb);
}
return pb;
} else {//GET_RIGHT(t) == NULLL
pb = GET_PARENT(t);
p = init_stm_blk__(ptst, MEMORY, pb);
chb = tb;
ch = t;
while(pb != NULL && chb == GET_RIGHT(p)) {
chb = pb;
ch = p;
pb = GET_PARENT(p);
p = init_stm_blk__(ptst, MEMORY, pb);
}
return pb;
}
}
}
static int sift_up(GW_LARGE_INT start, HEAP_PNT child_p)
{
GW_LARGE_INT parent, child;
HEAP_PNT heap_p;
child = start;
while (child > 1) {
parent = GET_PARENT(child);
seg_get(&search_heap, (char *)&heap_p, 0, parent);
/* push parent point down if child is smaller */
if (heap_cmp(&child_p, &heap_p)) {
seg_put(&search_heap, (char *)&heap_p, 0, child);
child = parent;
}
else
/* no more sifting up, found slot for child */
break;
}
/* add child to heap */
seg_put(&search_heap, (char *)&child_p, 0, child);
return 0;
}
static struct dentry *lookup_whiteout(struct dentry *dentry)
{
char *whname;
int bindex = -1, bstart = -1, bend = -1;
struct dentry *parent, *hidden_parent, *wh_dentry;
whname = alloc_whname(dentry->d_name.name, dentry->d_name.len);
if (IS_ERR(whname))
return (void *)whname;
parent = GET_PARENT(dentry);
lock_dentry(parent);
bstart = dbstart(parent);
bend = dbend(parent);
wh_dentry = ERR_PTR(-ENOENT);
for (bindex = bstart; bindex <= bend; bindex++) {
hidden_parent = dtohd_index(parent, bindex);
if (!hidden_parent)
continue;
wh_dentry =
LOOKUP_ONE_LEN(whname, hidden_parent,
dentry->d_name.len + WHLEN);
if (IS_ERR(wh_dentry))
continue;
if (wh_dentry->d_inode)
break;
DPUT(wh_dentry);
wh_dentry = ERR_PTR(-ENOENT);
}
unlock_dentry(parent);
DPUT(parent);
KFREE(whname);
return wh_dentry;
}
// x must be already open for writing
// x must have a parent
static void _right_rotate(ptst_t *ptst, stm_tx *tx, stm_blk *sb, stm_blk *xb, node_t *x) {
stm_blk *lb, *lrb, *pb;
node_t *l, *lr, *p;
lb = GET_LEFT(x);
pb = GET_PARENT(x);
l = WRITE_OBJ(lb);
p = WRITE_OBJ(pb);
lrb = GET_RIGHT(l);
x = WRITE_OBJ(xb);
SET_LEFT(x, lrb);
if (lrb != NULL ) {
lr = WRITE_OBJ(lrb);
SET_PARENT(lr, xb);
}
SET_PARENT(l, pb);
if(pb == NULL) {
set_t * s = (set_t*) WRITE_OBJ(sb);
SET_ROOT(s, lb);
} else if ( xb == GET_RIGHT(p) ) {
SET_RIGHT(p, lb);
} else {
SET_LEFT(p, lb);
}
SET_RIGHT(l, xb);
SET_PARENT(x, lb);
}//right_rotate
// x must be already open for writing
// x must have a parent
static void _left_rotate(ptst_t *ptst, stm_tx *tx, stm_blk *sb, stm_blk *xb, node_t *x) {
stm_blk *rb, *rlb, *pb;
node_t *r, *rl, *p;
rb = GET_RIGHT(x);
pb = GET_PARENT(x);
r = WRITE_OBJ(rb);
p = WRITE_OBJ(pb);
rlb = GET_LEFT(r);
x = WRITE_OBJ(xb);
SET_RIGHT(x, rlb);
if ( rlb != NULL ) {
rl = WRITE_OBJ(rlb);
SET_PARENT(rl, xb);
}
SET_PARENT(r, pb);
if(pb == NULL) {
set_t * s = (set_t*) WRITE_OBJ(sb);
SET_ROOT(s, rb);
} else if ( GET_LEFT(p) == xb ) {
SET_LEFT(p, rb);
} else {
SET_RIGHT(p, rb);
}
SET_LEFT(r, xb);
SET_PARENT(x, rb);
}//left_rotate
/*得到node结点的外舅结点并将其存在uncle中*/
Status getUncle(RBTree node,RBTree &uncle){
RBTree parent = GET_PARENT(node);
RBTree grandparent;
if(!parent) return ERROR;
else grandparent = GET_PARENT(parent);
if(!node || !parent || !grandparent)
return ERROR;
if(parent == grandparent->lchild){
uncle = grandparent->rchild;
if(uncle == NULL)
return ERROR;
return OK;
}else{
uncle = grandparent->lchild;
if(uncle == NULL)
return ERROR;
return OK;
}
}
static Status RBTree_delete_realize_case1(pt_RBRoot root,RBTree node){
RBTree replaceNodeChild,replaceNodeParent;
ColorType replaceNodeColor;
if(node->lchild && node->rchild){
RBTree replaceNode = node;
replaceNode = node->rchild;
while(replaceNode->lchild){
replaceNode = replaceNode->lchild;
}
if(GET_PARENT(node)){
if(node == node->parent->lchild){
node->parent->lchild = replaceNode;
}else{
node->parent->rchild = replaceNode;
}
}else{
root->RBRootNode = replaceNode;
}
replaceNodeChild = replaceNode->rchild;
replaceNodeParent = replaceNode->parent;
replaceNodeColor = replaceNode->color;
if(replaceNodeParent == node){
replaceNodeParent = replaceNode;
}else{
if(replaceNodeChild){
replaceNodeChild->parent = replaceNodeParent;
}
replaceNodeParent->lchild = replaceNodeChild;
replaceNode->rchild = node->rchild;
node->rchild->parent = replaceNode;
}
replaceNode->parent = node->parent;
replaceNode->color = node->color;
replaceNode->lchild = node->lchild;
node->lchild->parent = replaceNode;
if(replaceNodeColor == BLACK){
if(!RBTree_delete_fixup(root,replaceNodeChild,replaceNodeParent)) return ERROR;
}
free(node);
return OK;
}else{
return ERROR;
}
}
/*this is used by the first node of a size*/
inline static int get_direction(void * bp) {
void * parent = (void *)GET_PARENT(bp);
if (parent == NULL_POINTER) {
return 0;
}
if ((void *)GET_LEFT(parent) == bp) {
return 1;
}
if ((void *)GET_RIGHT(parent) == bp) {
return 2;
}
return -1;
}
static void initialize_bucket(qt_hash h,
size_t bucket)
{
size_t parent = GET_PARENT(bucket);
marked_ptr_t cur;
if (h->B[parent] == UNINITIALIZED) {
initialize_bucket(h, parent);
}
hash_entry *dummy = qpool_alloc(hash_entry_pool);
assert(dummy);
dummy->hashed_key = so_dummykey(bucket);
dummy->key = NULL;
dummy->value = NULL;
dummy->next = (hash_entry*)UNINITIALIZED;
if (!qt_lf_list_insert(&(h->B[parent]), dummy, &cur, NULL, h->op_equals)) {
qpool_free(hash_entry_pool, dummy);
dummy = PTR_OF(cur);
while (h->B[bucket] != CONSTRUCT(0, dummy)) ;
} else {
h->B[bucket] = CONSTRUCT(0, dummy);
}
}
static int unionfs_unlink_whiteout(struct inode *dir, struct dentry *dentry)
{
int err = 0;
struct dentry *hidden_old_dentry;
struct dentry *hidden_wh_dentry = NULL;
struct dentry *hidden_old_dir_dentry, *hidden_new_dir_dentry;
char *name = NULL;
struct iattr newattrs;
print_entry_location();
fist_print_dentry("IN unionfs_unlink_whiteout: ", dentry);
/* create whiteout, get the leftmost underlying dentry and rename it */
hidden_old_dentry = dtohd(dentry);
/* lookup .wh.foo first, MUST NOT EXIST */
name = KMALLOC(dentry->d_name.len + sizeof(".wh."), GFP_UNIONFS);
if (!name) {
err = -ENOMEM;
goto out;
}
strcpy(name, ".wh.");
strncat(name, dentry->d_name.name, dentry->d_name.len);
name[4 + dentry->d_name.len] = '\0';
hidden_wh_dentry =
LOOKUP_ONE_LEN(name, hidden_old_dentry->d_parent,
dentry->d_name.len + 4);
if (IS_ERR(hidden_wh_dentry)) {
err = PTR_ERR(hidden_wh_dentry);
goto out;
}
ASSERT(hidden_wh_dentry->d_inode == NULL);
DGET(hidden_old_dentry);
hidden_old_dir_dentry = GET_PARENT(hidden_old_dentry);
hidden_new_dir_dentry = GET_PARENT(hidden_wh_dentry);
double_lock(hidden_old_dir_dentry, hidden_new_dir_dentry);
if (!(err = is_robranch(dentry))) {
if (S_ISREG(hidden_old_dentry->d_inode->i_mode)) {
err = vfs_rename(hidden_old_dir_dentry->d_inode,
hidden_old_dentry,
hidden_new_dir_dentry->d_inode,
hidden_wh_dentry);
} else {
err = vfs_unlink(hidden_old_dir_dentry->d_inode,
hidden_old_dentry);
if (!err)
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
err = vfs_create(hidden_new_dir_dentry->d_inode,
hidden_wh_dentry, 0666, NULL);
#else
err = vfs_create(hidden_new_dir_dentry->d_inode,
hidden_wh_dentry, 0666);
#endif
}
}
double_unlock(hidden_old_dir_dentry, hidden_new_dir_dentry);
DPUT(hidden_old_dentry);
DPUT(hidden_wh_dentry);
if (!err) {
hidden_wh_dentry = LOOKUP_ONE_LEN(name,
hidden_old_dentry->d_parent,
dentry->d_name.len + 4);
if (IS_ERR(hidden_wh_dentry)) {
err = PTR_ERR(hidden_wh_dentry);
goto out;
}
PASSERT(hidden_wh_dentry->d_inode);
down(&hidden_wh_dentry->d_inode->i_sem);
newattrs.ia_valid = ATTR_CTIME;
if (hidden_wh_dentry->d_inode->i_size != 0) {
newattrs.ia_valid |= ATTR_SIZE;
newattrs.ia_size = 0;
}
/* We discard this error, because the entry is whited out
* even if we fail here. */
notify_change(hidden_wh_dentry, &newattrs);
up(&hidden_wh_dentry->d_inode->i_sem);
DPUT(hidden_wh_dentry);
}
if (err) {
if (dbstart(dentry) == 0)
goto out;
/* exit if the error returned was NOT -EROFS */
if (!IS_COPYUP_ERR(err))
goto out;
err = create_whiteout(dentry, dbstart(dentry) - 1);
} else {
fist_copy_attr_all(dir, hidden_new_dir_dentry->d_inode);
}
out:
KFREE(name);
print_exit_status(err);
return err;
}
static int do_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry,
int bindex, struct dentry **wh_old)
{
int err = 0;
struct dentry *hidden_old_dentry;
struct dentry *hidden_new_dentry;
struct dentry *hidden_old_dir_dentry;
struct dentry *hidden_new_dir_dentry;
struct dentry *hidden_wh_dentry;
struct dentry *hidden_wh_dir_dentry;
char *wh_name = NULL;
print_entry(" bindex=%d", bindex);
fist_print_dentry("IN: do_rename, old_dentry", old_dentry);
fist_print_dentry("IN: do_rename, new_dentry", new_dentry);
fist_dprint(7, "do_rename for bindex = %d\n", bindex);
hidden_new_dentry = dtohd_index(new_dentry, bindex);
hidden_old_dentry = dtohd_index(old_dentry, bindex);
if (!hidden_new_dentry) {
hidden_new_dentry =
create_parents(new_dentry->d_parent->d_inode, new_dentry,
bindex);
if (IS_ERR(hidden_new_dentry)) {
fist_dprint(7,
"error creating directory tree for rename, bindex = %d\n",
bindex);
err = PTR_ERR(hidden_new_dentry);
goto out;
}
}
wh_name = alloc_whname(new_dentry->d_name.name, new_dentry->d_name.len);
if (IS_ERR(wh_name)) {
err = PTR_ERR(wh_name);
goto out;
}
hidden_wh_dentry =
LOOKUP_ONE_LEN(wh_name, hidden_new_dentry->d_parent,
new_dentry->d_name.len + WHLEN);
if (IS_ERR(hidden_wh_dentry)) {
err = PTR_ERR(hidden_wh_dentry);
goto out;
}
if (hidden_wh_dentry->d_inode) {
/* get rid of the whiteout that is existing */
if (hidden_new_dentry->d_inode) {
printk(KERN_WARNING
"Both a whiteout and a dentry exist when doing a rename!\n");
err = -EIO;
DPUT(hidden_wh_dentry);
goto out;
}
hidden_wh_dir_dentry = lock_parent(hidden_wh_dentry);
if (!(err = is_robranch_super(old_dentry->d_sb, bindex))) {
err =
vfs_unlink(hidden_wh_dir_dentry->d_inode,
hidden_wh_dentry);
}
DPUT(hidden_wh_dentry);
unlock_dir(hidden_wh_dir_dentry);
if (err)
goto out;
} else
DPUT(hidden_wh_dentry);
DGET(hidden_old_dentry);
hidden_old_dir_dentry = GET_PARENT(hidden_old_dentry);
hidden_new_dir_dentry = GET_PARENT(hidden_new_dentry);
lock_rename(hidden_old_dir_dentry, hidden_new_dir_dentry);
err = is_robranch_super(old_dentry->d_sb, bindex);
if (err)
goto out_unlock;
/* ready to whiteout for old_dentry.
caller will create the actual whiteout,
and must dput(*wh_old) */
if (wh_old) {
char *whname;
whname = alloc_whname(old_dentry->d_name.name,
old_dentry->d_name.len);
err = PTR_ERR(whname);
if (IS_ERR(whname))
goto out_unlock;
*wh_old = LOOKUP_ONE_LEN(whname, hidden_old_dir_dentry,
old_dentry->d_name.len + WHLEN);
KFREE(whname);
err = PTR_ERR(*wh_old);
if (IS_ERR(*wh_old)) {
*wh_old = NULL;
goto out_unlock;
}
}
fist_print_dentry("NEWBEF", new_dentry);
fist_print_dentry("OLDBEF", old_dentry);
err = vfs_rename(hidden_old_dir_dentry->d_inode, hidden_old_dentry,
hidden_new_dir_dentry->d_inode, hidden_new_dentry);
fist_print_dentry("NEWAFT", new_dentry);
fist_print_dentry("OLDAFT", old_dentry);
out_unlock:
unlock_rename(hidden_old_dir_dentry, hidden_new_dir_dentry);
DPUT(hidden_old_dir_dentry);
DPUT(hidden_new_dir_dentry);
DPUT(hidden_old_dentry);
out:
if (!err) {
/* Fixup the newdentry. */
if (bindex < dbstart(new_dentry))
set_dbstart(new_dentry, bindex);
else if (bindex > dbend(new_dentry))
set_dbend(new_dentry, bindex);
}
KFREE(wh_name);
fist_print_dentry("OUT: do_rename, old_dentry", old_dentry);
fist_print_dentry("OUT: do_rename, new_dentry", new_dentry);
print_exit_status(err);
return err;
}
struct dentry *unionfs_lookup_backend(struct dentry *dentry, int lookupmode)
{
int err = 0;
struct dentry *hidden_dentry = NULL;
struct dentry *wh_hidden_dentry = NULL;
struct dentry *hidden_dir_dentry = NULL;
struct dentry *parent_dentry = NULL;
int bindex, bstart, bend, bopaque;
int dentry_count = 0; /* Number of positive dentries. */
int first_dentry_offset = -1;
struct dentry *first_hidden_dentry = NULL;
int locked_parent = 0;
int locked_child = 0;
int opaque;
char *whname = NULL;
const char *name;
int namelen;
print_entry("mode = %d", lookupmode);
/* We should already have a lock on this dentry in the case of a
* partial lookup, or a revalidation. Otherwise it is returned from
* new_dentry_private_data already locked. */
if (lookupmode == INTERPOSE_PARTIAL || lookupmode == INTERPOSE_REVAL
|| lookupmode == INTERPOSE_REVAL_NEG) {
verify_locked(dentry);
} else {
BUG_ON(dtopd_nocheck(dentry) != NULL);
locked_child = 1;
}
if (lookupmode != INTERPOSE_PARTIAL)
if ((err = new_dentry_private_data(dentry)))
goto out;
/* must initialize dentry operations */
dentry->d_op = &unionfs_dops;
parent_dentry = GET_PARENT(dentry);
/* We never partial lookup the root directory. */
if (parent_dentry != dentry) {
lock_dentry(parent_dentry);
locked_parent = 1;
} else {
DPUT(parent_dentry);
parent_dentry = NULL;
goto out;
}
fist_print_dentry("IN unionfs_lookup (parent)", parent_dentry);
fist_print_dentry("IN unionfs_lookup (child)", dentry);
name = dentry->d_name.name;
namelen = dentry->d_name.len;
/* No dentries should get created for possible whiteout names. */
if (!is_validname(name)) {
err = -EPERM;
goto out_free;
}
/* Now start the actual lookup procedure. */
bstart = dbstart(parent_dentry);
bend = dbend(parent_dentry);
bopaque = dbopaque(parent_dentry);
BUG_ON(bstart < 0);
/* It would be ideal if we could convert partial lookups to only have
* to do this work when they really need to. It could probably improve
* performance quite a bit, and maybe simplify the rest of the code. */
if (lookupmode == INTERPOSE_PARTIAL) {
bstart++;
if ((bopaque != -1) && (bopaque < bend))
bend = bopaque;
}
fist_dprint(8, "bstart = %d, bend = %d\n", bstart, bend);
for (bindex = bstart; bindex <= bend; bindex++) {
hidden_dentry = dtohd_index(dentry, bindex);
if (lookupmode == INTERPOSE_PARTIAL && hidden_dentry)
continue;
BUG_ON(hidden_dentry != NULL);
hidden_dir_dentry = dtohd_index(parent_dentry, bindex);
/* if the parent hidden dentry does not exist skip this */
if (!(hidden_dir_dentry && hidden_dir_dentry->d_inode))
continue;
/* also skip it if the parent isn't a directory. */
if (!S_ISDIR(hidden_dir_dentry->d_inode->i_mode))
continue;
/* Reuse the whiteout name because its value doesn't change. */
if (!whname) {
whname = alloc_whname(name, namelen);
if (IS_ERR(whname)) {
err = PTR_ERR(whname);
goto out_free;
}
}
/* check if whiteout exists in this branch: lookup .wh.foo */
wh_hidden_dentry = LOOKUP_ONE_LEN(whname, hidden_dir_dentry,
namelen + WHLEN);
if (IS_ERR(wh_hidden_dentry)) {
DPUT(first_hidden_dentry);
err = PTR_ERR(wh_hidden_dentry);
goto out_free;
}
if (wh_hidden_dentry->d_inode) {
/* We found a whiteout so lets give up. */
fist_dprint(8, "whiteout found in %d\n", bindex);
if (S_ISREG(wh_hidden_dentry->d_inode->i_mode)) {
set_dbend(dentry, bindex);
set_dbopaque(dentry, bindex);
DPUT(wh_hidden_dentry);
break;
}
err = -EIO;
printk(KERN_NOTICE "EIO: Invalid whiteout entry type"
" %d.\n", wh_hidden_dentry->d_inode->i_mode);
DPUT(wh_hidden_dentry);
DPUT(first_hidden_dentry);
goto out_free;
}
DPUT(wh_hidden_dentry);
wh_hidden_dentry = NULL;
/* Now do regular lookup; lookup foo */
hidden_dentry = LOOKUP_ONE_LEN(name, hidden_dir_dentry,
namelen);
fist_print_generic_dentry("hidden result", hidden_dentry);
if (IS_ERR(hidden_dentry)) {
DPUT(first_hidden_dentry);
err = PTR_ERR(hidden_dentry);
goto out_free;
}
/* Store the first negative dentry specially, because if they
* are all negative we need this for future creates. */
if (!hidden_dentry->d_inode) {
if (!first_hidden_dentry && (dbstart(dentry) == -1)) {
first_hidden_dentry = hidden_dentry;
first_dentry_offset = bindex;
} else {
DPUT(hidden_dentry);
}
continue;
}
/* number of positive dentries */
dentry_count++;
/* store underlying dentry */
if (dbstart(dentry) == -1)
set_dbstart(dentry, bindex);
set_dtohd_index(dentry, bindex, hidden_dentry);
set_dbend(dentry, bindex);
/* update parent directory's atime with the bindex */
fist_copy_attr_atime(parent_dentry->d_inode,
hidden_dir_dentry->d_inode);
/* We terminate file lookups here. */
if (!S_ISDIR(hidden_dentry->d_inode->i_mode)) {
if (lookupmode == INTERPOSE_PARTIAL)
continue;
if (dentry_count == 1)
goto out_positive;
/* This can only happen with mixed D-*-F-* */
BUG_ON(!S_ISDIR(dtohd(dentry)->d_inode->i_mode));
continue;
}
opaque = is_opaque_dir(dentry, bindex);
if (opaque < 0) {
DPUT(first_hidden_dentry);
err = opaque;
goto out_free;
}
if (opaque) {
set_dbend(dentry, bindex);
set_dbopaque(dentry, bindex);
break;
}
}
if (dentry_count)
goto out_positive;
else
goto out_negative;
out_negative:
if (lookupmode == INTERPOSE_PARTIAL)
goto out;
/* If we've only got negative dentries, then use the leftmost one. */
if (lookupmode == INTERPOSE_REVAL) {
if (dentry->d_inode) {
itopd(dentry->d_inode)->uii_stale = 1;
}
goto out;
}
/* This should only happen if we found a whiteout. */
if (first_dentry_offset == -1) {
first_hidden_dentry = LOOKUP_ONE_LEN(name, hidden_dir_dentry,
namelen);
first_dentry_offset = bindex;
if (IS_ERR(first_hidden_dentry)) {
err = PTR_ERR(first_hidden_dentry);
goto out;
}
}
set_dtohd_index(dentry, first_dentry_offset, first_hidden_dentry);
set_dbstart(dentry, first_dentry_offset);
set_dbend(dentry, first_dentry_offset);
if (lookupmode == INTERPOSE_REVAL_NEG)
BUG_ON(dentry->d_inode != NULL);
else
d_add(dentry, NULL);
goto out;
/* This part of the code is for positive dentries. */
out_positive:
BUG_ON(dentry_count <= 0);
/* If we're holding onto the first negative dentry throw it out. */
DPUT(first_hidden_dentry);
/* Partial lookups need to reinterpose, or throw away older negs. */
if (lookupmode == INTERPOSE_PARTIAL) {
if (dentry->d_inode) {
unionfs_reinterpose(dentry);
goto out;
}
/* This somehow turned positive, so it is as if we had a
* negative revalidation. */
lookupmode = INTERPOSE_REVAL_NEG;
update_bstart(dentry);
bstart = dbstart(dentry);
bend = dbend(dentry);
}
err = unionfs_interpose(dentry, dentry->d_sb, lookupmode);
if (err)
goto out_drop;
fist_checkinode(dentry->d_inode, "unionfs_lookup OUT: child");
fist_checkinode(parent_dentry->d_inode, "unionfs_lookup OUT: dir");
goto out;
out_drop:
d_drop(dentry);
out_free:
/* should dput all the underlying dentries on error condition */
bstart = dbstart(dentry);
if (bstart >= 0) {
bend = dbend(dentry);
for (bindex = bstart; bindex <= bend; bindex++)
DPUT(dtohd_index(dentry, bindex));
}
KFREE(dtohd_ptr(dentry));
dtohd_ptr(dentry) = NULL;
set_dbstart(dentry, -1);
set_dbend(dentry, -1);
out:
if (!err && dtopd(dentry)) {
BUG_ON(dbend(dentry) > dtopd(dentry)->udi_bcount);
BUG_ON(dbend(dentry) > sbmax(dentry->d_sb));
BUG_ON(dbstart(dentry) < 0);
}
KFREE(whname);
fist_print_dentry("OUT unionfs_lookup (parent)", parent_dentry);
fist_print_dentry("OUT unionfs_lookup (child)", dentry);
if (locked_parent)
unlock_dentry(parent_dentry);
DPUT(parent_dentry);
if (locked_child)
unlock_dentry(dentry);
print_exit_status(err);
return ERR_PTR(err);
}
static void _fix_after_insertion(ptst_t *ptst, stm_tx *tx, stm_blk *sb, stm_blk *xb, node_t *x) {
stm_blk *pb, *gpb, *yb, *lub;
node_t *p, *gp, *y;
SET_COLOUR(x, RED);
// rebalance tree
set_t * s = (set_t*)READ_OBJ(sb);
while (xb != NULL && GET_PARENT(x) != NULL) {
pb = GET_PARENT(x);
p = READ_OBJ(pb);
if (IS_BLACK(p)) // case 2 - parent is black
break;
gpb = GET_PARENT(p);
gp = READ_OBJ(gpb);
lub = GET_LEFT(gp);
if (pb == lub) {
// parent is red, p=GET_LEFT(g)
yb = GET_RIGHT(gp); // y (uncle)
y = READ_OBJ(yb);
if (IS_RED(y)) {
// case 3 - parent is red, uncle is red (p = GET_LEFT(gp))
p = WRITE_OBJ(pb);
y = WRITE_OBJ(yb);
gp = WRITE_OBJ(gpb);
SET_COLOUR(p, BLACK);
SET_COLOUR(y, BLACK);
SET_COLOUR(gp, RED);
xb = gpb;
x = gp;
} else {
// parent is red, uncle is black (p = GET_LEFT(gp))
if ( xb == GET_RIGHT(p) ) {
// case 4 - parent is red, uncle is black, x = GET_RIGHT(p), p = GET_LEFT(gp)
xb = pb;
x = WRITE_OBJ(pb);
_left_rotate(ptst, tx, sb, xb, x);
pb=GET_PARENT(x);
}
// case 5 - parent is red, uncle is black, x = GET_LEFT(p), p = GET_LEFT(gp)
p = WRITE_OBJ(pb);
gpb = GET_PARENT(p);
gp = WRITE_OBJ(gpb);
SET_COLOUR(p, BLACK);
SET_COLOUR(gp, RED);
if (gp != NULL) {
_right_rotate(ptst, tx, sb, gpb, gp);
}
}
} else {
// parent is red, p = GET_RIGHT(gp)
yb = lub;
y = READ_OBJ(yb);
if (IS_RED(y)) {
// case 3 - parent is red, uncle is red (p = GET_RIGHT(gp))
p = WRITE_OBJ(pb);
y = WRITE_OBJ(yb);
gp = WRITE_OBJ(gpb);
SET_COLOUR(p, BLACK);
SET_COLOUR(y, BLACK);
SET_COLOUR(gp, RED);
xb = gpb;
x = gp;
} else {
// parent is red, uncle is black (p = GET_RIGHT(gp))
if ( xb == GET_LEFT(p) ) {
// case 4 - parent is red, uncle is black, x = GET_LEFT(p), p = GET_RIGHT(gp)
xb = pb;
x = WRITE_OBJ(pb);
_right_rotate(ptst, tx, sb, xb, x);
pb = GET_PARENT(x);
}
// case 5 - parent is red, uncle is black, x = GET_RIGHT(p), p = GET_RIGHT(gp)
p = WRITE_OBJ(pb);
gpb = GET_PARENT(p);
gp = WRITE_OBJ(gpb);
SET_COLOUR(p, BLACK);
SET_COLOUR(gp, RED);
if(gp != NULL) {
_left_rotate(ptst, tx, sb, gpb, gp);
}
}
}
}
s = (set_t*)READ_OBJ(sb);
stm_blk * rob = GET_ROOT(s);
node_t * ro = READ_OBJ(rob);
if (IS_RED(ro)) {
ro = WRITE_OBJ(rob);
SET_COLOUR(ro,BLACK);
}
}
static void _fix_after_deletion(ptst_t *ptst, stm_tx *tx, stm_blk *sb, stm_blk *xb, node_t *x) {
stm_blk *pb, *plb, *sibb, *siblb, *sibrb;
node_t *p, *sib, *sibl, *sibr;
set_t *s;
while (GET_PARENT(x)!=NULL && IS_BLACK(x)) {
pb = GET_PARENT(x);
p = WRITE_OBJ(pb);
plb = GET_LEFT(p);
if ( xb == plb ) {
sibb = GET_RIGHT(p);
sib = WRITE_OBJ(sibb);
if (IS_RED(sib)) {
SET_COLOUR(sib, BLACK);
SET_COLOUR(p, RED);
_left_rotate(ptst, tx, sb, pb, p);
pb = GET_PARENT(x);
p=WRITE_OBJ(pb);
sibb = GET_RIGHT(p);
sib = WRITE_OBJ(sibb);
}
siblb = GET_LEFT(sib);
sibl = READ_OBJ(siblb);
sibrb = GET_RIGHT(sib);
sibr = READ_OBJ(sibrb);
if (IS_BLACK(sibl) && IS_BLACK(sibr)) {
SET_COLOUR(sib, RED);
xb = GET_PARENT(x);
x = WRITE_OBJ(xb);
} else {
if (IS_BLACK(sibr)) {
sibl = WRITE_OBJ(siblb);
SET_COLOUR(sibl, BLACK);
SET_COLOUR(sib,RED);
_right_rotate(ptst, tx, sb, sibb, sib);
pb = GET_PARENT(x);
p = WRITE_OBJ(pb);
sibb = GET_RIGHT(p);
}
sib = WRITE_OBJ(sibb);
SET_COLOUR(sib, GET_COLOUR(p));
p = WRITE_OBJ(pb);
SET_COLOUR(p, BLACK);
sibrb = GET_RIGHT(sib);
sibr = WRITE_OBJ(sibrb);
SET_COLOUR(sibr, BLACK);
_left_rotate(ptst, tx, sb, pb, p);
s = (set_t*)READ_OBJ(sb);
xb = GET_ROOT(s);
x = WRITE_OBJ(xb);
break;
}
} else { // inverse
sibb = plb;
sib = WRITE_OBJ(sibb);
if (IS_RED(sib)) {
SET_COLOUR(sib, BLACK);
SET_COLOUR(p, RED);
_right_rotate(ptst, tx, sb, pb, p);
pb = GET_PARENT(x);
p=WRITE_OBJ(pb);
sibb = GET_LEFT(p);
sib = WRITE_OBJ(sibb);
}
siblb = GET_LEFT(sib);
sibl = READ_OBJ(siblb);
sibrb = GET_RIGHT(sib);
sibr = READ_OBJ(sibrb);
if (IS_BLACK(sibl) && IS_BLACK(sibr)) {
SET_COLOUR(sib, RED);
xb = GET_PARENT(x);
x = WRITE_OBJ(xb);
} else {
if (IS_BLACK(sibl)) {
sibr = WRITE_OBJ(sibrb);
SET_COLOUR(sibr, BLACK);
SET_COLOUR(sib, RED);
_left_rotate(ptst, tx, sb, sibb, sib);
pb = GET_PARENT(x);
p = WRITE_OBJ(pb);
sibb = GET_LEFT(p);
}
sib = WRITE_OBJ(sibb);
SET_COLOUR(sib, GET_COLOUR(p));
p = WRITE_OBJ(pb);
SET_COLOUR(p, BLACK);
siblb = GET_LEFT(sib);
sibl = WRITE_OBJ(siblb);
SET_COLOUR(sibl, BLACK);
_right_rotate(ptst, tx, sb, pb, p);
s = (set_t*)READ_OBJ(sb);
xb = GET_ROOT(s);
x = WRITE_OBJ(xb);
break;
}
}
}
if(IS_RED(x)) {
SET_COLOUR(x, BLACK);
}
}//fix_after_deletion
inline static void insert_node( void *bp ) {
RESET_PREALLOC_INFO(GET_NEXT(bp)); //reset the second bit of the HDRPer of the next block
if (GET_SIZE(bp) == 8) {
PUT_LEFT(bp, list_for_8);
list_for_8 = bp;
/*used to be wrong with mistaking SET to RESET */
SET_PRE_8_INFO(GET_NEXT(bp));
return;
} else if (GET_SIZE(bp) == 16){
if (list_for_16 == NULL_POINTER) {
PUT_RIGHT(bp, list_for_16);
PUT_LEFT(bp, NULL_POINTER);
list_for_16 = bp;
return;
}
PUT_RIGHT(bp, list_for_16);
PUT_LEFT(list_for_16, bp);
PUT_LEFT(bp, NULL_POINTER);
list_for_16 = bp;
} else { //use BST when block size > 16
if (root == NULL_POINTER) {
PUT_LEFT(bp, NULL_POINTER);
PUT_RIGHT(bp, NULL_POINTER);
PUT_PARENT(bp, NULL_POINTER);
PUT_BROTHER(bp, NULL_POINTER);
root = bp; //root is also an address.
return;
} else {
void *parent = root;
void *temp = root;
int flag = 0;
/*flag = 0 : the root itself; flag = 1 : left; flag = 2 : right*/
while (temp != NULL_POINTER) {
/*when finding the free block in BST with the same size*/
if (GET_SIZE(temp) == GET_SIZE(bp)) {
PUT_LEFT(bp, GET_LEFT(temp));
PUT_RIGHT(bp, GET_RIGHT(temp));
PUT_BROTHER(bp, temp);
PUT_PARENT(GET_LEFT(temp), bp);
PUT_PARENT(GET_RIGHT(temp), bp);
PUT_LEFT(temp, bp);
PUT_PARENT(bp, GET_PARENT(temp));
if (flag == 0) {
root = bp;
} else if (flag == 1) {
PUT_LEFT(parent, bp);
} else {
PUT_RIGHT(parent, bp);
}
return;
/*SEARCH RIGHT CHILD*/
} else if (GET_SIZE(temp) < GET_SIZE(bp)) {
parent = temp;
temp = (void *)GET_RIGHT(temp);
flag = 2;
/*SEARCH LEFT CHILD*/
} else {
parent = temp;
temp = (void *)GET_LEFT(temp);
flag = 1;
}
}
/*insert new node*/
if (flag == 1) {
PUT_LEFT(parent, bp);
} else {
PUT_RIGHT(parent, bp);
}
PUT_LEFT(bp, NULL_POINTER);
PUT_RIGHT(bp, NULL_POINTER);
PUT_PARENT(bp, parent);
PUT_BROTHER(bp, NULL_POINTER);
}
}
//BST_checker(root);
}
static int unionfs_create(struct inode *parent, struct dentry *dentry,
int mode, struct nameidata *nd)
{
int err = 0;
struct dentry *hidden_dentry = NULL;
struct dentry *whiteout_dentry = NULL;
struct dentry *new_hidden_dentry;
struct dentry *hidden_parent_dentry = NULL;
int bindex = 0, bstart;
char *name = NULL;
print_entry_location();
lock_dentry(dentry);
fist_print_dentry("IN unionfs_create", dentry);
/* We start out in the leftmost branch. */
bstart = dbstart(dentry);
hidden_dentry = dtohd(dentry);
/* check if whiteout exists in this branch, i.e. lookup .wh.foo first */
name = alloc_whname(dentry->d_name.name, dentry->d_name.len);
if (IS_ERR(name)) {
err = PTR_ERR(name);
goto out;
}
whiteout_dentry =
LOOKUP_ONE_LEN(name, hidden_dentry->d_parent,
dentry->d_name.len + WHLEN);
if (IS_ERR(whiteout_dentry)) {
err = PTR_ERR(whiteout_dentry);
whiteout_dentry = NULL;
goto out;
}
if (whiteout_dentry->d_inode) {
/* .wh.foo has been found. */
/* First truncate it and then rename it to foo (hence having
* the same overall effect as a normal create.
*
* XXX: This is not strictly correct. If we have unlinked the
* file and it still has a reference count, then we should
* actually unlink the whiteout so that user's data isn't
* hosed over.
*/
struct dentry *hidden_dir_dentry;
struct iattr newattrs;
down(&whiteout_dentry->d_inode->i_sem);
newattrs.ia_valid = ATTR_CTIME | ATTR_MODE | ATTR_ATIME
| ATTR_MTIME | ATTR_UID | ATTR_GID | ATTR_FORCE
| ATTR_KILL_SUID | ATTR_KILL_SGID;
newattrs.ia_mode = mode & ~current->fs->umask;
newattrs.ia_uid = current->fsuid;
newattrs.ia_gid = current->fsgid;
if (whiteout_dentry->d_inode->i_size != 0) {
newattrs.ia_valid |= ATTR_SIZE;
newattrs.ia_size = 0;
}
err = notify_change(whiteout_dentry, &newattrs);
up(&whiteout_dentry->d_inode->i_sem);
if (err)
printk(KERN_WARNING
"unionfs: %s:%d: notify_change failed: %d, ignoring..\n",
__FILE__, __LINE__, err);
new_hidden_dentry = dtohd(dentry);
DGET(new_hidden_dentry);
hidden_dir_dentry = GET_PARENT(whiteout_dentry);
lock_rename(hidden_dir_dentry, hidden_dir_dentry);
if (!(err = is_robranch_super(dentry->d_sb, bstart))) {
err =
vfs_rename(hidden_dir_dentry->d_inode,
whiteout_dentry,
hidden_dir_dentry->d_inode,
new_hidden_dentry);
}
if (!err) {
fist_copy_attr_timesizes(parent,
new_hidden_dentry->d_parent->
d_inode);
parent->i_nlink = get_nlinks(parent);
}
unlock_rename(hidden_dir_dentry, hidden_dir_dentry);
DPUT(hidden_dir_dentry);
DPUT(new_hidden_dentry);
if (err) {
/* exit if the error returned was NOT -EROFS */
if (!IS_COPYUP_ERR(err))
goto out;
/* We were not able to create the file in this branch,
* so, we try to create it in one branch to left
*/
bstart--;
} else {
/* reset the unionfs dentry to point to the .wh.foo entry. */
/* Discard any old reference. */
DPUT(dtohd(dentry));
/* Trade one reference to another. */
set_dtohd_index(dentry, bstart, whiteout_dentry);
whiteout_dentry = NULL;
err = unionfs_interpose(dentry, parent->i_sb, 0);
goto out;
}
}
for (bindex = bstart; bindex >= 0; bindex--) {
hidden_dentry = dtohd_index(dentry, bindex);
if (!hidden_dentry) {
/* if hidden_dentry is NULL, create the entire
* dentry directory structure in branch 'bindex'.
* hidden_dentry will NOT be null when bindex == bstart
* because lookup passed as a negative unionfs dentry
* pointing to a lone negative underlying dentry */
hidden_dentry = create_parents(parent, dentry, bindex);
if (!hidden_dentry || IS_ERR(hidden_dentry)) {
if (IS_ERR(hidden_dentry))
err = PTR_ERR(hidden_dentry);
continue;
}
}
fist_checkinode(parent, "unionfs_create");
hidden_parent_dentry = lock_parent(hidden_dentry);
if (IS_ERR(hidden_parent_dentry)) {
err = PTR_ERR(hidden_parent_dentry);
goto out;
}
/* We shouldn't create things in a read-only branch. */
if (!(err = is_robranch_super(dentry->d_sb, bindex))) {
//DQ: vfs_create has a different prototype in 2.6
err = vfs_create(hidden_parent_dentry->d_inode,
hidden_dentry, mode, nd);
}
if (err || !hidden_dentry->d_inode) {
unlock_dir(hidden_parent_dentry);
/* break out of for loop if the error wasn't -EROFS */
if (!IS_COPYUP_ERR(err))
break;
} else {
err = unionfs_interpose(dentry, parent->i_sb, 0);
if (!err) {
fist_copy_attr_timesizes(parent,
hidden_parent_dentry->
d_inode);
/* update number of links on parent directory */
parent->i_nlink = get_nlinks(parent);
}
unlock_dir(hidden_parent_dentry);
break;
}
}
out:
DPUT(whiteout_dentry);
KFREE(name);
fist_print_dentry("OUT unionfs_create :", dentry);
unlock_dentry(dentry);
print_exit_status(err);
return err;
}