static struct dentry *
lock_hdir_create_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup,
struct dtime *dt)
{
struct dentry *wh_dentry;
int err, need_wh;
struct dentry *hidden_parent, *parent;
struct inode *dir, *h_dir;
struct lkup_args lkup;
LKTRTrace("%.*s, isdir %d\n", DLNPair(dentry), isdir);
err = need_wh = wr_dir_need_wh(dentry, isdir, bcpup, NULL);
//err = -1;
wh_dentry = ERR_PTR(err);
if (unlikely(err < 0))
goto out;
parent = dentry->d_parent;
dir = parent->d_inode;
hidden_parent = au_h_dptr_i(parent, *bcpup);
h_dir = hidden_parent->d_inode;
hdir_lock(h_dir, dir, *bcpup);
dtime_store(dt, parent, hidden_parent);
if (!need_wh)
return NULL; /* success, no need to create whiteout */
lkup.nfsmnt = au_nfsmnt(dentry->d_sb, *bcpup);
lkup.dlgt = need_dlgt(dentry->d_sb);
wh_dentry = simple_create_wh(dentry, *bcpup, hidden_parent, &lkup);
//wh_dentry = ERR_PTR(-1);
if (!IS_ERR(wh_dentry))
goto out; /* success */
/* returns with the parent is locked and wh_dentry is DGETed */
hdir_unlock(h_dir, dir, *bcpup);
out:
TraceErrPtr(wh_dentry);
return wh_dentry;
}
/*
* final procedure of adding a new entry, except link(2).
* remove whiteout, instantiate, copyup the parent dir's times and size
* and update version.
* if it failed, re-create the removed whiteout.
*/
static int epilog(struct inode *dir, aufs_bindex_t bindex,
struct dentry *wh_dentry, struct dentry *dentry)
{
int err, rerr;
aufs_bindex_t bwh;
struct inode *inode, *h_dir;
struct dentry *wh;
struct au_ndx ndx;
struct super_block *sb;
LKTRTrace("wh %p, %.*s\n", wh_dentry, AuDLNPair(dentry));
sb = dentry->d_sb;
bwh = -1;
if (wh_dentry) {
h_dir = wh_dentry->d_parent->d_inode; /* dir inode is locked */
IMustLock(h_dir);
AuDebugOn(au_h_iptr(dir, bindex) != h_dir);
bwh = au_dbwh(dentry);
err = au_wh_unlink_dentry(au_hi(dir, bindex), wh_dentry, dentry,
/*dlgt*/0);
if (unlikely(err))
goto out;
}
inode = au_new_inode(dentry, /*must_new*/1);
if (!IS_ERR(inode)) {
d_instantiate(dentry, inode);
dir = dentry->d_parent->d_inode; /* dir inode is locked */
IMustLock(dir);
/* or always cpup dir mtime? */
if (au_ibstart(dir) == au_dbstart(dentry))
au_cpup_attr_timesizes(dir);
dir->i_version++;
return 0; /* success */
}
err = PTR_ERR(inode);
if (!wh_dentry)
goto out;
/* revert */
ndx.flags = 0;
if (au_test_dlgt(au_mntflags(sb)))
au_fset_ndx(ndx.flags, DLGT);
ndx.nfsmnt = au_nfsmnt(sb, bwh);
ndx.nd = NULL;
/* ndx.br = NULL; */
/* dir inode is locked */
wh = au_wh_create(dentry, bwh, wh_dentry->d_parent, &ndx);
rerr = PTR_ERR(wh);
if (IS_ERR(wh)) {
AuIOErr("%.*s reverting whiteout failed(%d, %d)\n",
AuDLNPair(dentry), err, rerr);
err = -EIO;
} else
dput(wh);
out:
AuTraceErr(err);
return err;
}
/*
* initial procedure of adding a new entry.
* prepare writable branch and the parent dir, lock it,
* lookup whiteout for the new entry.
*/
static struct dentry*
lock_hdir_lkup_wh(struct dentry *dentry, struct au_dtime *dt,
struct dentry *src_dentry, struct au_pin *pin,
struct au_wr_dir_args *wr_dir_args)
{
struct dentry *wh_dentry, *h_parent;
struct super_block *sb;
int err;
unsigned int mnt_flags;
unsigned char pin_flags;
aufs_bindex_t bstart, bcpup;
struct au_ndx ndx;
LKTRTrace("%.*s, src %p\n", AuDLNPair(dentry), src_dentry);
bstart = au_dbstart(dentry);
err = au_wr_dir(dentry, src_dentry, wr_dir_args);
bcpup = err;
wh_dentry = ERR_PTR(err);
if (unlikely(err < 0))
goto out;
sb = dentry->d_sb;
mnt_flags = au_mntflags(sb);
pin_flags = AuPin_DI_LOCKED | AuPin_MNT_WRITE;
if (dt && au_opt_test(mnt_flags, UDBA_INOTIFY))
au_fset_pin(pin_flags, DO_GPARENT);
err = au_pin(pin, dentry, bcpup, pin_flags);
wh_dentry = ERR_PTR(err);
if (unlikely(err))
goto out;
ndx.nfsmnt = au_nfsmnt(sb, bcpup);
ndx.flags = 0;
if (au_test_dlgt(mnt_flags))
au_fset_ndx(ndx.flags, DLGT);
ndx.nd = NULL;
/* ndx.br = NULL; */
/* ndx.nd_file = NULL; */
h_parent = au_pinned_h_parent(pin);
if (!au_opt_test(mnt_flags, UDBA_NONE) && au_dbstart(dentry) == bcpup) {
struct nameidata nd;
if (ndx.nfsmnt) {
/* todo: dirty? */
ndx.nd = &nd;
ndx.br = au_sbr(sb, bcpup);
memset(&nd, 0, sizeof(nd));
nd.flags = LOOKUP_CREATE;
nd.intent.open.flags = O_EXCL;
}
err = au_may_add(dentry, bcpup, h_parent,
au_ftest_wrdir(wr_dir_args->flags, ISDIR),
&ndx);
wh_dentry = ERR_PTR(err);
if (unlikely(err))
goto out_unpin;
ndx.nd = NULL;
ndx.br = NULL;
}
if (dt)
au_dtime_store(dt, au_pinned_parent(pin), h_parent,
au_pinned_hdir(pin), au_pinned_hgdir(pin));
wh_dentry = NULL;
if (/* bcpup != bstart || */ bcpup != au_dbwh(dentry))
goto out; /* success */
wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, &ndx);
out_unpin:
if (IS_ERR(wh_dentry))
au_unpin(pin);
out:
AuTraceErrPtr(wh_dentry);
return wh_dentry;
}
/*
* copyup the deleted file for writing.
*/
static int cpup_wh_file(struct file *file, aufs_bindex_t bdst, loff_t len)
{
int err;
struct dentry *dentry, *parent, *hidden_parent, *tmp_dentry;
struct dentry *hidden_dentry_bstart, *hidden_dentry_bdst;
struct inode *hidden_dir;
aufs_bindex_t bstart;
struct aufs_dinfo *dinfo;
struct dtime dt;
struct lkup_args lkup;
struct super_block *sb;
dentry = file->f_dentry;
LKTRTrace("%.*s, bdst %d, len %Lu\n", DLNPair(dentry), bdst, len);
DEBUG_ON(S_ISDIR(dentry->d_inode->i_mode)
|| !(file->f_mode & FMODE_WRITE));
DiMustWriteLock(dentry);
parent = dentry->d_parent;
IiMustAnyLock(parent->d_inode);
hidden_parent = au_h_dptr_i(parent, bdst);
DEBUG_ON(!hidden_parent);
hidden_dir = hidden_parent->d_inode;
DEBUG_ON(!hidden_dir);
IMustLock(hidden_dir);
sb = parent->d_sb;
lkup.nfsmnt = au_nfsmnt(sb, bdst);
lkup.dlgt = need_dlgt(sb);
tmp_dentry = lkup_whtmp(hidden_parent, &dentry->d_name, &lkup);
//if (LktrCond) {dput(tmp_dentry); tmp_dentry = ERR_PTR(-1);}
err = PTR_ERR(tmp_dentry);
if (IS_ERR(tmp_dentry))
goto out;
dtime_store(&dt, parent, hidden_parent);
dinfo = dtodi(dentry);
bstart = dinfo->di_bstart;
hidden_dentry_bdst = dinfo->di_hdentry[0 + bdst].hd_dentry;
hidden_dentry_bstart = dinfo->di_hdentry[0 + bstart].hd_dentry;
dinfo->di_bstart = bdst;
dinfo->di_hdentry[0 + bdst].hd_dentry = tmp_dentry;
dinfo->di_hdentry[0 + bstart].hd_dentry = au_h_fptr(file)->f_dentry;
err = cpup_single(dentry, bdst, bstart, len,
au_flags_cpup(!CPUP_DTIME, parent));
//if (LktrCond) err = -1;
if (!err)
err = au_reopen_nondir(file);
//err = -1;
if (unlikely(err)) {
dinfo->di_hdentry[0 + bstart].hd_dentry = hidden_dentry_bstart;
dinfo->di_hdentry[0 + bdst].hd_dentry = hidden_dentry_bdst;
dinfo->di_bstart = bstart;
goto out_tmp;
}
DEBUG_ON(!d_unhashed(dentry));
err = vfsub_unlink(hidden_dir, tmp_dentry, lkup.dlgt);
//if (LktrCond) err = -1;
if (unlikely(err)) {
IOErr("failed remove copied-up tmp file %.*s(%d)\n",
DLNPair(tmp_dentry), err);
err = -EIO;
}
dtime_revert(&dt, !CPUP_LOCKED_GHDIR);
out_tmp:
dput(tmp_dentry);
out:
TraceErr(err);
return err;
}
