/*
* find the index of a branch which is specified by @br_id.
*/
int au_br_index(struct super_block *sb, aufs_bindex_t br_id)
{
aufs_bindex_t bindex, bend;
bend = au_sbend(sb);
for (bindex = 0; bindex <= bend; bindex++)
if (au_sbr_id(sb, bindex) == br_id)
return bindex;
return -1;
}
static int au_opt_xino(struct super_block *sb, struct au_opt *opt,
struct au_opt_xino **opt_xino,
struct au_opts *opts)
{
int err;
aufs_bindex_t bend, bindex;
struct dentry *root, *parent, *h_root;
err = 0;
switch (opt->type) {
case Opt_xino:
err = au_xino_set(sb, &opt->xino,
!!au_ftest_opts(opts->flags, REMOUNT));
if (unlikely(err))
break;
*opt_xino = &opt->xino;
au_xino_brid_set(sb, -1);
/* safe d_parent access */
parent = opt->xino.file->f_dentry->d_parent;
root = sb->s_root;
bend = au_sbend(sb);
for (bindex = 0; bindex <= bend; bindex++) {
h_root = au_h_dptr(root, bindex);
if (h_root == parent) {
au_xino_brid_set(sb, au_sbr_id(sb, bindex));
break;
}
}
break;
case Opt_noxino:
au_xino_clr(sb);
au_xino_brid_set(sb, -1);
*opt_xino = (void *)-1;
break;
}
return err;
}
void au_dir_ts(struct inode *dir, aufs_bindex_t bindex)
{
int perm, wkq_err;
aufs_bindex_t btop;
struct au_dir_ts_arg *arg;
struct dentry *dentry;
struct super_block *sb;
IMustLock(dir);
dentry = d_find_any_alias(dir);
AuDebugOn(!dentry);
sb = dentry->d_sb;
btop = au_ibtop(dir);
if (btop == bindex) {
au_cpup_attr_timesizes(dir);
goto out;
}
perm = au_sbr_perm(sb, btop);
if (!au_br_writable(perm))
goto out;
arg = kmalloc(sizeof(*arg), GFP_NOFS);
if (!arg)
goto out;
arg->dentry = dget(dentry); /* will be dput-ted by au_do_dir_ts() */
arg->brid = au_sbr_id(sb, bindex);
wkq_err = au_wkq_nowait(au_do_dir_ts, arg, sb, /*flags*/0);
if (unlikely(wkq_err)) {
pr_err("wkq %d\n", wkq_err);
dput(dentry);
kfree(arg);
}
out:
dput(dentry);
}
