void au_dtime_revert(struct au_dtime *dt)
{
struct iattr attr;
int err;
struct au_hin_ignore ign[2];
struct vfsub_args vargs;
LKTRTrace("%.*s\n", AuDLNPair(dt->dt_dentry));
attr.ia_atime = dt->dt_atime;
attr.ia_mtime = dt->dt_mtime;
attr.ia_valid = ATTR_FORCE | ATTR_MTIME | ATTR_MTIME_SET
| ATTR_ATIME | ATTR_ATIME_SET;
vfsub_args_init(&vargs, ign,
au_test_dlgt(au_mntflags(dt->dt_dentry->d_sb)), 0);
/*
* IN_ATTRIB should be divided into
* IN_ATTRIB_ATIME, IN_ATTRIB_MTIME ...,
* and define all ORed new IN_ATTRIB macro.
*/
vfsub_ign_hinode(&vargs, IN_ATTRIB, dt->dt_hinode);
vfsub_ign_hinode(&vargs, IN_ATTRIB, dt->dt_hdir);
err = vfsub_notify_change(dt->dt_h_dentry, &attr, &vargs);
if (unlikely(err))
AuWarn("restoring timestamps failed(%d). ignored\n", err);
}
int aufs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *st)
{
int err;
aufs_bindex_t bindex;
struct inode *inode;
struct dentry *h_dentry;
struct super_block *sb;
unsigned int mnt_flags;
LKTRTrace("%.*s\n", AuDLNPair(dentry));
inode = dentry->d_inode;
sb = dentry->d_sb;
aufs_read_lock(dentry, AuLock_FLUSH | AuLock_IR);
/* todo: refine it */
mnt_flags = au_mntflags(sb);
if (au_opt_test(mnt_flags, PLINK) && au_plink_test(sb, inode))
goto plinked;
h_dentry = au_h_dget_any(dentry, &bindex);
err = PTR_ERR(h_dentry);
if (IS_ERR(h_dentry))
goto out;
err = -ENOENT;
if (h_dentry->d_inode)
err = vfsub_getattr(au_sbr_mnt(sb, bindex), h_dentry, st,
au_test_dlgt(mnt_flags));
dput(h_dentry);
if (!err) {
au_cpup_attr_all(inode);
plinked:
generic_fillattr(inode, st);
}
out:
aufs_read_unlock(dentry, AuLock_IR);
AuTraceErr(err);
return err;
}
/*
* 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;
}
