static void aufs_d_release(struct dentry *dentry)
{
struct au_dinfo *dinfo;
aufs_bindex_t bend, bindex;
dinfo = dentry->d_fsdata;
if (!dinfo)
return;
/* dentry may not be revalidated */
bindex = dinfo->di_bstart;
if (bindex >= 0) {
struct au_hdentry *p;
bend = dinfo->di_bend;
p = dinfo->di_hdentry + bindex;
while (bindex++ <= bend) {
if (p->hd_dentry)
au_hdput(p);
p++;
}
}
kfree(dinfo->di_hdentry);
AuRwDestroy(&dinfo->di_rwsem);
au_cache_free_dinfo(dinfo);
au_hin_di_reinit(dentry);
}
void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex,
struct dentry *h_dentry)
{
struct au_hdentry *hd = au_di(dentry)->di_hdentry + bindex;
DiMustWriteLock(dentry);
if (hd->hd_dentry)
au_hdput(hd);
hd->hd_dentry = h_dentry;
}
void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex,
struct dentry *h_dentry)
{
struct au_hdentry *hd = au_di(dentry)->di_hdentry + bindex;
DiMustWriteLock(dentry);
AuDebugOn(bindex < au_di(dentry)->di_bstart
|| bindex > au_di(dentry)->di_bend
|| (h_dentry && atomic_read(&h_dentry->d_count) <= 0)
|| (h_dentry && hd->hd_dentry)
);
if (hd->hd_dentry)
au_hdput(hd, /*do_free*/0);
hd->hd_dentry = h_dentry;
}
void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex,
struct dentry *h_dentry)
{
struct au_hdentry *hd = au_di(dentry)->di_hdentry + bindex;
struct au_branch *br;
DiMustWriteLock(dentry);
au_hdput(hd);
hd->hd_dentry = h_dentry;
if (h_dentry) {
br = au_sbr(dentry->d_sb, bindex);
hd->hd_id = br->br_id;
}
}
void au_di_free(struct au_dinfo *dinfo)
{
struct au_hdentry *p;
aufs_bindex_t bend, bindex;
/* dentry may not be revalidated */
bindex = dinfo->di_bstart;
if (bindex >= 0) {
bend = dinfo->di_bend;
p = dinfo->di_hdentry + bindex;
while (bindex++ <= bend)
au_hdput(p++);
}
kfree(dinfo->di_hdentry);
au_cache_free_dinfo(dinfo);
}
static int au_do_refresh_hdentry(struct dentry *dentry, struct dentry *parent)
{
int err;
aufs_bindex_t new_bindex, bindex, bend, bwh, bdiropq;
struct au_hdentry tmp, *p, *q;
struct au_dinfo *dinfo;
struct super_block *sb;
DiMustWriteLock(dentry);
sb = dentry->d_sb;
dinfo = au_di(dentry);
bend = dinfo->di_bend;
bwh = dinfo->di_bwh;
bdiropq = dinfo->di_bdiropq;
p = dinfo->di_hdentry + dinfo->di_bstart;
for (bindex = dinfo->di_bstart; bindex <= bend; bindex++, p++) {
if (!p->hd_dentry)
continue;
new_bindex = au_br_index(sb, p->hd_id);
if (new_bindex == bindex)
continue;
if (dinfo->di_bwh == bindex)
bwh = new_bindex;
if (dinfo->di_bdiropq == bindex)
bdiropq = new_bindex;
if (new_bindex < 0) {
au_hdput(p);
p->hd_dentry = NULL;
continue;
}
/* swap two lower dentries, and loop again */
q = dinfo->di_hdentry + new_bindex;
tmp = *q;
*q = *p;
*p = tmp;
if (tmp.hd_dentry) {
bindex--;
p--;
}
}
dinfo->di_bwh = -1;
if (bwh >= 0 && bwh <= au_sbend(sb) && au_sbr_whable(sb, bwh))
dinfo->di_bwh = bwh;
dinfo->di_bdiropq = -1;
if (bdiropq >= 0
&& bdiropq <= au_sbend(sb)
&& au_sbr_whable(sb, bdiropq))
dinfo->di_bdiropq = bdiropq;
err = -EIO;
dinfo->di_bstart = -1;
dinfo->di_bend = -1;
bend = au_dbend(parent);
p = dinfo->di_hdentry;
for (bindex = 0; bindex <= bend; bindex++, p++)
if (p->hd_dentry) {
dinfo->di_bstart = bindex;
break;
}
if (dinfo->di_bstart >= 0) {
p = dinfo->di_hdentry + bend;
for (bindex = bend; bindex >= 0; bindex--, p--)
if (p->hd_dentry) {
dinfo->di_bend = bindex;
err = 0;
break;
}
}
return err;
}
static void au_do_refresh_hdentry(struct au_hdentry *p, struct au_dinfo *dinfo,
struct dentry *parent)
{
struct dentry *h_d, *h_dp;
struct au_hdentry tmp, *q;
struct super_block *sb;
aufs_bindex_t new_bindex, bindex, bend, bwh, bdiropq;
AuRwMustWriteLock(&dinfo->di_rwsem);
bend = dinfo->di_bend;
bwh = dinfo->di_bwh;
bdiropq = dinfo->di_bdiropq;
for (bindex = dinfo->di_bstart; bindex <= bend; bindex++, p++) {
h_d = p->hd_dentry;
if (!h_d)
continue;
h_dp = dget_parent(h_d);
if (h_dp == au_h_dptr(parent, bindex)) {
dput(h_dp);
continue;
}
new_bindex = au_find_dbindex(parent, h_dp);
dput(h_dp);
if (dinfo->di_bwh == bindex)
bwh = new_bindex;
if (dinfo->di_bdiropq == bindex)
bdiropq = new_bindex;
if (new_bindex < 0) {
au_hdput(p);
p->hd_dentry = NULL;
continue;
}
/* swap two lower dentries, and loop again */
q = dinfo->di_hdentry + new_bindex;
tmp = *q;
*q = *p;
*p = tmp;
if (tmp.hd_dentry) {
bindex--;
p--;
}
}
sb = parent->d_sb;
dinfo->di_bwh = -1;
if (bwh >= 0 && bwh <= au_sbend(sb) && au_sbr_whable(sb, bwh))
dinfo->di_bwh = bwh;
dinfo->di_bdiropq = -1;
if (bdiropq >= 0
&& bdiropq <= au_sbend(sb)
&& au_sbr_whable(sb, bdiropq))
dinfo->di_bdiropq = bdiropq;
bend = au_dbend(parent);
p = dinfo->di_hdentry;
for (bindex = 0; bindex <= bend; bindex++, p++)
if (p->hd_dentry) {
dinfo->di_bstart = bindex;
break;
}
p = dinfo->di_hdentry + bend;
for (bindex = bend; bindex >= 0; bindex--, p--)
if (p->hd_dentry) {
dinfo->di_bend = bindex;
break;
}
}