Linux-libre 4.5-gnu

1 files changed, 0 insertions, 1394 deletions

diff --git a/fs/aufs/branch.c b/fs/aufs/branch.c
deleted file mode 100644
index 1ab5e1f2d..000000000
--- a/fs/aufs/branch.c
+++ /dev/null
@@ -1,1394 +0,0 @@
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- */
-
-/*
- * branch management
- */
-
-#include <linux/compat.h>
-#include <linux/statfs.h>
-#include "aufs.h"
-
-/*
- * free a single branch
- */
-static void au_br_do_free(struct au_branch *br)
-{
-	int i;
-	struct au_wbr *wbr;
-	struct au_dykey **key;
-
-	au_hnotify_fin_br(br);
-
-	if (br->br_xino.xi_file)
-		fput(br->br_xino.xi_file);
-	mutex_destroy(&br->br_xino.xi_nondir_mtx);
-
-	AuDebugOn(atomic_read(&br->br_count));
-
-	wbr = br->br_wbr;
-	if (wbr) {
-		for (i = 0; i < AuBrWh_Last; i++)
-			dput(wbr->wbr_wh[i]);
-		AuDebugOn(atomic_read(&wbr->wbr_wh_running));
-		AuRwDestroy(&wbr->wbr_wh_rwsem);
-	}
-
-	if (br->br_fhsm) {
-		au_br_fhsm_fin(br->br_fhsm);
-		kfree(br->br_fhsm);
-	}
-
-	key = br->br_dykey;
-	for (i = 0; i < AuBrDynOp; i++, key++)
-		if (*key)
-			au_dy_put(*key);
-		else
-			break;
-
-	/* recursive lock, s_umount of branch's */
-	lockdep_off();
-	path_put(&br->br_path);
-	lockdep_on();
-	kfree(wbr);
-	kfree(br);
-}
-
-/*
- * frees all branches
- */
-void au_br_free(struct au_sbinfo *sbinfo)
-{
-	aufs_bindex_t bmax;
-	struct au_branch **br;
-
-	AuRwMustWriteLock(&sbinfo->si_rwsem);
-
-	bmax = sbinfo->si_bend + 1;
-	br = sbinfo->si_branch;
-	while (bmax--)
-		au_br_do_free(*br++);
-}
-
-/*
- * 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;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * add a branch
- */
-
-static int test_overlap(struct super_block *sb, struct dentry *h_adding,
-			struct dentry *h_root)
-{
-	if (unlikely(h_adding == h_root
-		     || au_test_loopback_overlap(sb, h_adding)))
-		return 1;
-	if (h_adding->d_sb != h_root->d_sb)
-		return 0;
-	return au_test_subdir(h_adding, h_root)
-		|| au_test_subdir(h_root, h_adding);
-}
-
-/*
- * returns a newly allocated branch. @new_nbranch is a number of branches
- * after adding a branch.
- */
-static struct au_branch *au_br_alloc(struct super_block *sb, int new_nbranch,
-				     int perm)
-{
-	struct au_branch *add_branch;
-	struct dentry *root;
-	struct inode *inode;
-	int err;
-
-	err = -ENOMEM;
-	root = sb->s_root;
-	add_branch = kzalloc(sizeof(*add_branch), GFP_NOFS);
-	if (unlikely(!add_branch))
-		goto out;
-
-	err = au_hnotify_init_br(add_branch, perm);
-	if (unlikely(err))
-		goto out_br;
-
-	if (au_br_writable(perm)) {
-		/* may be freed separately at changing the branch permission */
-		add_branch->br_wbr = kzalloc(sizeof(*add_branch->br_wbr),
-					     GFP_NOFS);
-		if (unlikely(!add_branch->br_wbr))
-			goto out_hnotify;
-	}
-
-	if (au_br_fhsm(perm)) {
-		err = au_fhsm_br_alloc(add_branch);
-		if (unlikely(err))
-			goto out_wbr;
-	}
-
-	err = au_sbr_realloc(au_sbi(sb), new_nbranch);
-	if (!err)
-		err = au_di_realloc(au_di(root), new_nbranch);
-	if (!err) {
-		inode = d_inode(root);
-		err = au_ii_realloc(au_ii(inode), new_nbranch);
-	}
-	if (!err)
-		return add_branch; /* success */
-
-out_wbr:
-	kfree(add_branch->br_wbr);
-out_hnotify:
-	au_hnotify_fin_br(add_branch);
-out_br:
-	kfree(add_branch);
-out:
-	return ERR_PTR(err);
-}
-
-/*
- * test if the branch permission is legal or not.
- */
-static int test_br(struct inode *inode, int brperm, char *path)
-{
-	int err;
-
-	err = (au_br_writable(brperm) && IS_RDONLY(inode));
-	if (!err)
-		goto out;
-
-	err = -EINVAL;
-	pr_err("write permission for readonly mount or inode, %s\n", path);
-
-out:
-	return err;
-}
-
-/*
- * returns:
- * 0: success, the caller will add it
- * plus: success, it is already unified, the caller should ignore it
- * minus: error
- */
-static int test_add(struct super_block *sb, struct au_opt_add *add, int remount)
-{
-	int err;
-	aufs_bindex_t bend, bindex;
-	struct dentry *root, *h_dentry;
-	struct inode *inode, *h_inode;
-
-	root = sb->s_root;
-	bend = au_sbend(sb);
-	if (unlikely(bend >= 0
-		     && au_find_dbindex(root, add->path.dentry) >= 0)) {
-		err = 1;
-		if (!remount) {
-			err = -EINVAL;
-			pr_err("%s duplicated\n", add->pathname);
-		}
-		goto out;
-	}
-
-	err = -ENOSPC; /* -E2BIG; */
-	if (unlikely(AUFS_BRANCH_MAX <= add->bindex
-		     || AUFS_BRANCH_MAX - 1 <= bend)) {
-		pr_err("number of branches exceeded %s\n", add->pathname);
-		goto out;
-	}
-
-	err = -EDOM;
-	if (unlikely(add->bindex < 0 || bend + 1 < add->bindex)) {
-		pr_err("bad index %d\n", add->bindex);
-		goto out;
-	}
-
-	inode = d_inode(add->path.dentry);
-	err = -ENOENT;
-	if (unlikely(!inode->i_nlink)) {
-		pr_err("no existence %s\n", add->pathname);
-		goto out;
-	}
-
-	err = -EINVAL;
-	if (unlikely(inode->i_sb == sb)) {
-		pr_err("%s must be outside\n", add->pathname);
-		goto out;
-	}
-
-	if (unlikely(au_test_fs_unsuppoted(inode->i_sb))) {
-		pr_err("unsupported filesystem, %s (%s)\n",
-		       add->pathname, au_sbtype(inode->i_sb));
-		goto out;
-	}
-
-	if (unlikely(inode->i_sb->s_stack_depth)) {
-		pr_err("already stacked, %s (%s)\n",
-		       add->pathname, au_sbtype(inode->i_sb));
-		goto out;
-	}
-
-	err = test_br(d_inode(add->path.dentry), add->perm, add->pathname);
-	if (unlikely(err))
-		goto out;
-
-	if (bend < 0)
-		return 0; /* success */
-
-	err = -EINVAL;
-	for (bindex = 0; bindex <= bend; bindex++)
-		if (unlikely(test_overlap(sb, add->path.dentry,
-					  au_h_dptr(root, bindex)))) {
-			pr_err("%s is overlapped\n", add->pathname);
-			goto out;
-		}
-
-	err = 0;
-	if (au_opt_test(au_mntflags(sb), WARN_PERM)) {
-		h_dentry = au_h_dptr(root, 0);
-		h_inode = d_inode(h_dentry);
-		if ((h_inode->i_mode & S_IALLUGO) != (inode->i_mode & S_IALLUGO)
-		    || !uid_eq(h_inode->i_uid, inode->i_uid)
-		    || !gid_eq(h_inode->i_gid, inode->i_gid))
-			pr_warn("uid/gid/perm %s %u/%u/0%o, %u/%u/0%o\n",
-				add->pathname,
-				i_uid_read(inode), i_gid_read(inode),
-				(inode->i_mode & S_IALLUGO),
-				i_uid_read(h_inode), i_gid_read(h_inode),
-				(h_inode->i_mode & S_IALLUGO));
-	}
-
-out:
-	return err;
-}
-
-/*
- * initialize or clean the whiteouts for an adding branch
- */
-static int au_br_init_wh(struct super_block *sb, struct au_branch *br,
-			 int new_perm)
-{
-	int err, old_perm;
-	aufs_bindex_t bindex;
-	struct mutex *h_mtx;
-	struct au_wbr *wbr;
-	struct au_hinode *hdir;
-	struct dentry *h_dentry;
-
-	err = vfsub_mnt_want_write(au_br_mnt(br));
-	if (unlikely(err))
-		goto out;
-
-	wbr = br->br_wbr;
-	old_perm = br->br_perm;
-	br->br_perm = new_perm;
-	hdir = NULL;
-	h_mtx = NULL;
-	bindex = au_br_index(sb, br->br_id);
-	if (0 <= bindex) {
-		hdir = au_hi(d_inode(sb->s_root), bindex);
-		au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT);
-	} else {
-		h_dentry = au_br_dentry(br);
-		h_mtx = &d_inode(h_dentry)->i_mutex;
-		mutex_lock_nested(h_mtx, AuLsc_I_PARENT);
-	}
-	if (!wbr)
-		err = au_wh_init(br, sb);
-	else {
-		wbr_wh_write_lock(wbr);
-		err = au_wh_init(br, sb);
-		wbr_wh_write_unlock(wbr);
-	}
-	if (hdir)
-		au_hn_imtx_unlock(hdir);
-	else
-		mutex_unlock(h_mtx);
-	vfsub_mnt_drop_write(au_br_mnt(br));
-	br->br_perm = old_perm;
-
-	if (!err && wbr && !au_br_writable(new_perm)) {
-		kfree(wbr);
-		br->br_wbr = NULL;
-	}
-
-out:
-	return err;
-}
-
-static int au_wbr_init(struct au_branch *br, struct super_block *sb,
-		       int perm)
-{
-	int err;
-	struct kstatfs kst;
-	struct au_wbr *wbr;
-
-	wbr = br->br_wbr;
-	au_rw_init(&wbr->wbr_wh_rwsem);
-	atomic_set(&wbr->wbr_wh_running, 0);
-
-	/*
-	 * a limit for rmdir/rename a dir
-	 * cf. AUFS_MAX_NAMELEN in include/uapi/linux/aufs_type.h
-	 */
-	err = vfs_statfs(&br->br_path, &kst);
-	if (unlikely(err))
-		goto out;
-	err = -EINVAL;
-	if (kst.f_namelen >= NAME_MAX)
-		err = au_br_init_wh(sb, br, perm);
-	else
-		pr_err("%pd(%s), unsupported namelen %ld\n",
-		       au_br_dentry(br),
-		       au_sbtype(au_br_dentry(br)->d_sb), kst.f_namelen);
-
-out:
-	return err;
-}
-
-/* initialize a new branch */
-static int au_br_init(struct au_branch *br, struct super_block *sb,
-		      struct au_opt_add *add)
-{
-	int err;
-	struct inode *h_inode;
-
-	err = 0;
-	mutex_init(&br->br_xino.xi_nondir_mtx);
-	br->br_perm = add->perm;
-	br->br_path = add->path; /* set first, path_get() later */
-	spin_lock_init(&br->br_dykey_lock);
-	atomic_set(&br->br_count, 0);
-	atomic_set(&br->br_xino_running, 0);
-	br->br_id = au_new_br_id(sb);
-	AuDebugOn(br->br_id < 0);
-
-	if (au_br_writable(add->perm)) {
-		err = au_wbr_init(br, sb, add->perm);
-		if (unlikely(err))
-			goto out_err;
-	}
-
-	if (au_opt_test(au_mntflags(sb), XINO)) {
-		h_inode = d_inode(add->path.dentry);
-		err = au_xino_br(sb, br, h_inode->i_ino,
-				 au_sbr(sb, 0)->br_xino.xi_file, /*do_test*/1);
-		if (unlikely(err)) {
-			AuDebugOn(br->br_xino.xi_file);
-			goto out_err;
-		}
-	}
-
-	sysaufs_br_init(br);
-	path_get(&br->br_path);
-	goto out; /* success */
-
-out_err:
-	memset(&br->br_path, 0, sizeof(br->br_path));
-out:
-	return err;
-}
-
-static void au_br_do_add_brp(struct au_sbinfo *sbinfo, aufs_bindex_t bindex,
-			     struct au_branch *br, aufs_bindex_t bend,
-			     aufs_bindex_t amount)
-{
-	struct au_branch **brp;
-
-	AuRwMustWriteLock(&sbinfo->si_rwsem);
-
-	brp = sbinfo->si_branch + bindex;
-	memmove(brp + 1, brp, sizeof(*brp) * amount);
-	*brp = br;
-	sbinfo->si_bend++;
-	if (unlikely(bend < 0))
-		sbinfo->si_bend = 0;
-}
-
-static void au_br_do_add_hdp(struct au_dinfo *dinfo, aufs_bindex_t bindex,
-			     aufs_bindex_t bend, aufs_bindex_t amount)
-{
-	struct au_hdentry *hdp;
-
-	AuRwMustWriteLock(&dinfo->di_rwsem);
-
-	hdp = dinfo->di_hdentry + bindex;
-	memmove(hdp + 1, hdp, sizeof(*hdp) * amount);
-	au_h_dentry_init(hdp);
-	dinfo->di_bend++;
-	if (unlikely(bend < 0))
-		dinfo->di_bstart = 0;
-}
-
-static void au_br_do_add_hip(struct au_iinfo *iinfo, aufs_bindex_t bindex,
-			     aufs_bindex_t bend, aufs_bindex_t amount)
-{
-	struct au_hinode *hip;
-
-	AuRwMustWriteLock(&iinfo->ii_rwsem);
-
-	hip = iinfo->ii_hinode + bindex;
-	memmove(hip + 1, hip, sizeof(*hip) * amount);
-	hip->hi_inode = NULL;
-	au_hn_init(hip);
-	iinfo->ii_bend++;
-	if (unlikely(bend < 0))
-		iinfo->ii_bstart = 0;
-}
-
-static void au_br_do_add(struct super_block *sb, struct au_branch *br,
-			 aufs_bindex_t bindex)
-{
-	struct dentry *root, *h_dentry;
-	struct inode *root_inode, *h_inode;
-	aufs_bindex_t bend, amount;
-
-	root = sb->s_root;
-	root_inode = d_inode(root);
-	bend = au_sbend(sb);
-	amount = bend + 1 - bindex;
-	h_dentry = au_br_dentry(br);
-	au_sbilist_lock();
-	au_br_do_add_brp(au_sbi(sb), bindex, br, bend, amount);
-	au_br_do_add_hdp(au_di(root), bindex, bend, amount);
-	au_br_do_add_hip(au_ii(root_inode), bindex, bend, amount);
-	au_set_h_dptr(root, bindex, dget(h_dentry));
-	h_inode = d_inode(h_dentry);
-	au_set_h_iptr(root_inode, bindex, au_igrab(h_inode), /*flags*/0);
-	au_sbilist_unlock();
-}
-
-int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount)
-{
-	int err;
-	aufs_bindex_t bend, add_bindex;
-	struct dentry *root, *h_dentry;
-	struct inode *root_inode;
-	struct au_branch *add_branch;
-
-	root = sb->s_root;
-	root_inode = d_inode(root);
-	IMustLock(root_inode);
-	err = test_add(sb, add, remount);
-	if (unlikely(err < 0))
-		goto out;
-	if (err) {
-		err = 0;
-		goto out; /* success */
-	}
-
-	bend = au_sbend(sb);
-	add_branch = au_br_alloc(sb, bend + 2, add->perm);
-	err = PTR_ERR(add_branch);
-	if (IS_ERR(add_branch))
-		goto out;
-
-	err = au_br_init(add_branch, sb, add);
-	if (unlikely(err)) {
-		au_br_do_free(add_branch);
-		goto out;
-	}
-
-	add_bindex = add->bindex;
-	if (!remount)
-		au_br_do_add(sb, add_branch, add_bindex);
-	else {
-		sysaufs_brs_del(sb, add_bindex);
-		au_br_do_add(sb, add_branch, add_bindex);
-		sysaufs_brs_add(sb, add_bindex);
-	}
-
-	h_dentry = add->path.dentry;
-	if (!add_bindex) {
-		au_cpup_attr_all(root_inode, /*force*/1);
-		sb->s_maxbytes = h_dentry->d_sb->s_maxbytes;
-	} else
-		au_add_nlink(root_inode, d_inode(h_dentry));
-
-	/*
-	 * this test/set prevents aufs from handling unnecesary notify events
-	 * of xino files, in case of re-adding a writable branch which was
-	 * once detached from aufs.
-	 */
-	if (au_xino_brid(sb) < 0
-	    && au_br_writable(add_branch->br_perm)
-	    && !au_test_fs_bad_xino(h_dentry->d_sb)
-	    && add_branch->br_xino.xi_file
-	    && add_branch->br_xino.xi_file->f_path.dentry->d_parent == h_dentry)
-		au_xino_brid_set(sb, add_branch->br_id);
-
-out:
-	return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static unsigned long long au_farray_cb(struct super_block *sb, void *a,
-				       unsigned long long max __maybe_unused,
-				       void *arg)
-{
-	unsigned long long n;
-	struct file **p, *f;
-	struct au_sphlhead *files;
-	struct au_finfo *finfo;
-
-	n = 0;
-	p = a;
-	files = &au_sbi(sb)->si_files;
-	spin_lock(&files->spin);
-	hlist_for_each_entry(finfo, &files->head, fi_hlist) {
-		f = finfo->fi_file;
-		if (file_count(f)
-		    && !special_file(file_inode(f)->i_mode)) {
-			get_file(f);
-			*p++ = f;
-			n++;
-			AuDebugOn(n > max);
-		}
-	}
-	spin_unlock(&files->spin);
-
-	return n;
-}
-
-static struct file **au_farray_alloc(struct super_block *sb,
-				     unsigned long long *max)
-{
-	*max = atomic_long_read(&au_sbi(sb)->si_nfiles);
-	return au_array_alloc(max, au_farray_cb, sb, /*arg*/NULL);
-}
-
-static void au_farray_free(struct file **a, unsigned long long max)
-{
-	unsigned long long ull;
-
-	for (ull = 0; ull < max; ull++)
-		if (a[ull])
-			fput(a[ull]);
-	kvfree(a);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * delete a branch
- */
-
-/* to show the line number, do not make it inlined function */
-#define AuVerbose(do_info, fmt, ...) do { \
-	if (do_info) \
-		pr_info(fmt, ##__VA_ARGS__); \
-} while (0)
-
-static int au_test_ibusy(struct inode *inode, aufs_bindex_t bstart,
-			 aufs_bindex_t bend)
-{
-	return (inode && !S_ISDIR(inode->i_mode)) || bstart == bend;
-}
-
-static int au_test_dbusy(struct dentry *dentry, aufs_bindex_t bstart,
-			 aufs_bindex_t bend)
-{
-	return au_test_ibusy(d_inode(dentry), bstart, bend);
-}
-
-/*
- * test if the branch is deletable or not.
- */
-static int test_dentry_busy(struct dentry *root, aufs_bindex_t bindex,
-			    unsigned int sigen, const unsigned int verbose)
-{
-	int err, i, j, ndentry;
-	aufs_bindex_t bstart, bend;
-	struct au_dcsub_pages dpages;
-	struct au_dpage *dpage;
-	struct dentry *d;
-
-	err = au_dpages_init(&dpages, GFP_NOFS);
-	if (unlikely(err))
-		goto out;
-	err = au_dcsub_pages(&dpages, root, NULL, NULL);
-	if (unlikely(err))
-		goto out_dpages;
-
-	for (i = 0; !err && i < dpages.ndpage; i++) {
-		dpage = dpages.dpages + i;
-		ndentry = dpage->ndentry;
-		for (j = 0; !err && j < ndentry; j++) {
-			d = dpage->dentries[j];
-			AuDebugOn(au_dcount(d) <= 0);
-			if (!au_digen_test(d, sigen)) {
-				di_read_lock_child(d, AuLock_IR);
-				if (unlikely(au_dbrange_test(d))) {
-					di_read_unlock(d, AuLock_IR);
-					continue;
-				}
-			} else {
-				di_write_lock_child(d);
-				if (unlikely(au_dbrange_test(d))) {
-					di_write_unlock(d);
-					continue;
-				}
-				err = au_reval_dpath(d, sigen);
-				if (!err)
-					di_downgrade_lock(d, AuLock_IR);
-				else {
-					di_write_unlock(d);
-					break;
-				}
-			}
-
-			/* AuDbgDentry(d); */
-			bstart = au_dbstart(d);
-			bend = au_dbend(d);
-			if (bstart <= bindex
-			    && bindex <= bend
-			    && au_h_dptr(d, bindex)
-			    && au_test_dbusy(d, bstart, bend)) {
-				err = -EBUSY;
-				AuVerbose(verbose, "busy %pd\n", d);
-				AuDbgDentry(d);
-			}
-			di_read_unlock(d, AuLock_IR);
-		}
-	}
-
-out_dpages:
-	au_dpages_free(&dpages);
-out:
-	return err;
-}
-
-static int test_inode_busy(struct super_block *sb, aufs_bindex_t bindex,
-			   unsigned int sigen, const unsigned int verbose)
-{
-	int err;
-	unsigned long long max, ull;
-	struct inode *i, **array;
-	aufs_bindex_t bstart, bend;
-
-	array = au_iarray_alloc(sb, &max);
-	err = PTR_ERR(array);
-	if (IS_ERR(array))
-		goto out;
-
-	err = 0;
-	AuDbg("b%d\n", bindex);
-	for (ull = 0; !err && ull < max; ull++) {
-		i = array[ull];
-		if (unlikely(!i))
-			break;
-		if (i->i_ino == AUFS_ROOT_INO)
-			continue;
-
-		/* AuDbgInode(i); */
-		if (au_iigen(i, NULL) == sigen)
-			ii_read_lock_child(i);
-		else {
-			ii_write_lock_child(i);
-			err = au_refresh_hinode_self(i);
-			au_iigen_dec(i);
-			if (!err)
-				ii_downgrade_lock(i);
-			else {
-				ii_write_unlock(i);
-				break;
-			}
-		}
-
-		bstart = au_ibstart(i);
-		bend = au_ibend(i);
-		if (bstart <= bindex
-		    && bindex <= bend
-		    && au_h_iptr(i, bindex)
-		    && au_test_ibusy(i, bstart, bend)) {
-			err = -EBUSY;
-			AuVerbose(verbose, "busy i%lu\n", i->i_ino);
-			AuDbgInode(i);
-		}
-		ii_read_unlock(i);
-	}
-	au_iarray_free(array, max);
-
-out:
-	return err;
-}
-
-static int test_children_busy(struct dentry *root, aufs_bindex_t bindex,
-			      const unsigned int verbose)
-{
-	int err;
-	unsigned int sigen;
-
-	sigen = au_sigen(root->d_sb);
-	DiMustNoWaiters(root);
-	IiMustNoWaiters(d_inode(root));
-	di_write_unlock(root);
-	err = test_dentry_busy(root, bindex, sigen, verbose);
-	if (!err)
-		err = test_inode_busy(root->d_sb, bindex, sigen, verbose);
-	di_write_lock_child(root); /* aufs_write_lock() calls ..._child() */
-
-	return err;
-}
-
-static int test_dir_busy(struct file *file, aufs_bindex_t br_id,
-			 struct file **to_free, int *idx)
-{
-	int err;
-	unsigned char matched, root;
-	aufs_bindex_t bindex, bend;
-	struct au_fidir *fidir;
-	struct au_hfile *hfile;
-
-	err = 0;
-	root = IS_ROOT(file->f_path.dentry);
-	if (root) {
-		get_file(file);
-		to_free[*idx] = file;
-		(*idx)++;
-		goto out;
-	}
-
-	matched = 0;
-	fidir = au_fi(file)->fi_hdir;
-	AuDebugOn(!fidir);
-	bend = au_fbend_dir(file);
-	for (bindex = au_fbstart(file); bindex <= bend; bindex++) {
-		hfile = fidir->fd_hfile + bindex;
-		if (!hfile->hf_file)
-			continue;
-
-		if (hfile->hf_br->br_id == br_id) {
-			matched = 1;
-			break;
-		}
-	}
-	if (matched)
-		err = -EBUSY;
-
-out:
-	return err;
-}
-
-static int test_file_busy(struct super_block *sb, aufs_bindex_t br_id,
-			  struct file **to_free, int opened)
-{
-	int err, idx;
-	unsigned long long ull, max;
-	aufs_bindex_t bstart;
-	struct file *file, **array;
-	struct dentry *root;
-	struct au_hfile *hfile;
-
-	array = au_farray_alloc(sb, &max);
-	err = PTR_ERR(array);
-	if (IS_ERR(array))
-		goto out;
-
-	err = 0;
-	idx = 0;
-	root = sb->s_root;
-	di_write_unlock(root);
-	for (ull = 0; ull < max; ull++) {
-		file = array[ull];
-		if (unlikely(!file))
-			break;
-
-		/* AuDbg("%pD\n", file); */
-		fi_read_lock(file);
-		bstart = au_fbstart(file);
-		if (!d_is_dir(file->f_path.dentry)) {
-			hfile = &au_fi(file)->fi_htop;
-			if (hfile->hf_br->br_id == br_id)
-				err = -EBUSY;
-		} else
-			err = test_dir_busy(file, br_id, to_free, &idx);
-		fi_read_unlock(file);
-		if (unlikely(err))
-			break;
-	}
-	di_write_lock_child(root);
-	au_farray_free(array, max);
-	AuDebugOn(idx > opened);
-
-out:
-	return err;
-}
-
-static void br_del_file(struct file **to_free, unsigned long long opened,
-			  aufs_bindex_t br_id)
-{
-	unsigned long long ull;
-	aufs_bindex_t bindex, bstart, bend, bfound;
-	struct file *file;
-	struct au_fidir *fidir;
-	struct au_hfile *hfile;
-
-	for (ull = 0; ull < opened; ull++) {
-		file = to_free[ull];
-		if (unlikely(!file))
-			break;
-
-		/* AuDbg("%pD\n", file); */
-		AuDebugOn(!d_is_dir(file->f_path.dentry));
-		bfound = -1;
-		fidir = au_fi(file)->fi_hdir;
-		AuDebugOn(!fidir);
-		fi_write_lock(file);
-		bstart = au_fbstart(file);
-		bend = au_fbend_dir(file);
-		for (bindex = bstart; bindex <= bend; bindex++) {
-			hfile = fidir->fd_hfile + bindex;
-			if (!hfile->hf_file)
-				continue;
-
-			if (hfile->hf_br->br_id == br_id) {
-				bfound = bindex;
-				break;
-			}
-		}
-		AuDebugOn(bfound < 0);
-		au_set_h_fptr(file, bfound, NULL);
-		if (bfound == bstart) {
-			for (bstart++; bstart <= bend; bstart++)
-				if (au_hf_dir(file, bstart)) {
-					au_set_fbstart(file, bstart);
-					break;
-				}
-		}
-		fi_write_unlock(file);
-	}
-}
-
-static void au_br_do_del_brp(struct au_sbinfo *sbinfo,
-			     const aufs_bindex_t bindex,
-			     const aufs_bindex_t bend)
-{
-	struct au_branch **brp, **p;
-
-	AuRwMustWriteLock(&sbinfo->si_rwsem);
-
-	brp = sbinfo->si_branch + bindex;
-	if (bindex < bend)
-		memmove(brp, brp + 1, sizeof(*brp) * (bend - bindex));
-	sbinfo->si_branch[0 + bend] = NULL;
-	sbinfo->si_bend--;
-
-	p = krealloc(sbinfo->si_branch, sizeof(*p) * bend, AuGFP_SBILIST);
-	if (p)
-		sbinfo->si_branch = p;
-	/* harmless error */
-}
-
-static void au_br_do_del_hdp(struct au_dinfo *dinfo, const aufs_bindex_t bindex,
-			     const aufs_bindex_t bend)
-{
-	struct au_hdentry *hdp, *p;
-
-	AuRwMustWriteLock(&dinfo->di_rwsem);
-
-	hdp = dinfo->di_hdentry;
-	if (bindex < bend)
-		memmove(hdp + bindex, hdp + bindex + 1,
-			sizeof(*hdp) * (bend - bindex));
-	hdp[0 + bend].hd_dentry = NULL;
-	dinfo->di_bend--;
-
-	p = krealloc(hdp, sizeof(*p) * bend, AuGFP_SBILIST);
-	if (p)
-		dinfo->di_hdentry = p;
-	/* harmless error */
-}
-
-static void au_br_do_del_hip(struct au_iinfo *iinfo, const aufs_bindex_t bindex,
-			     const aufs_bindex_t bend)
-{
-	struct au_hinode *hip, *p;
-
-	AuRwMustWriteLock(&iinfo->ii_rwsem);
-
-	hip = iinfo->ii_hinode + bindex;
-	if (bindex < bend)
-		memmove(hip, hip + 1, sizeof(*hip) * (bend - bindex));
-	iinfo->ii_hinode[0 + bend].hi_inode = NULL;
-	au_hn_init(iinfo->ii_hinode + bend);
-	iinfo->ii_bend--;
-
-	p = krealloc(iinfo->ii_hinode, sizeof(*p) * bend, AuGFP_SBILIST);
-	if (p)
-		iinfo->ii_hinode = p;
-	/* harmless error */
-}
-
-static void au_br_do_del(struct super_block *sb, aufs_bindex_t bindex,
-			 struct au_branch *br)
-{
-	aufs_bindex_t bend;
-	struct au_sbinfo *sbinfo;
-	struct dentry *root, *h_root;
-	struct inode *inode, *h_inode;
-	struct au_hinode *hinode;
-
-	SiMustWriteLock(sb);
-
-	root = sb->s_root;
-	inode = d_inode(root);
-	sbinfo = au_sbi(sb);
-	bend = sbinfo->si_bend;
-
-	h_root = au_h_dptr(root, bindex);
-	hinode = au_hi(inode, bindex);
-	h_inode = au_igrab(hinode->hi_inode);
-	au_hiput(hinode);
-
-	au_sbilist_lock();
-	au_br_do_del_brp(sbinfo, bindex, bend);
-	au_br_do_del_hdp(au_di(root), bindex, bend);
-	au_br_do_del_hip(au_ii(inode), bindex, bend);
-	au_sbilist_unlock();
-
-	dput(h_root);
-	iput(h_inode);
-	au_br_do_free(br);
-}
-
-static unsigned long long empty_cb(struct super_block *sb, void *array,
-				   unsigned long long max, void *arg)
-{
-	return max;
-}
-
-int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount)
-{
-	int err, rerr, i;
-	unsigned long long opened;
-	unsigned int mnt_flags;
-	aufs_bindex_t bindex, bend, br_id;
-	unsigned char do_wh, verbose;
-	struct au_branch *br;
-	struct au_wbr *wbr;
-	struct dentry *root;
-	struct file **to_free;
-
-	err = 0;
-	opened = 0;
-	to_free = NULL;
-	root = sb->s_root;
-	bindex = au_find_dbindex(root, del->h_path.dentry);
-	if (bindex < 0) {
-		if (remount)
-			goto out; /* success */
-		err = -ENOENT;
-		pr_err("%s no such branch\n", del->pathname);
-		goto out;
-	}
-	AuDbg("bindex b%d\n", bindex);
-
-	err = -EBUSY;
-	mnt_flags = au_mntflags(sb);
-	verbose = !!au_opt_test(mnt_flags, VERBOSE);
-	bend = au_sbend(sb);
-	if (unlikely(!bend)) {
-		AuVerbose(verbose, "no more branches left\n");
-		goto out;
-	}
-	br = au_sbr(sb, bindex);
-	AuDebugOn(!path_equal(&br->br_path, &del->h_path));
-
-	br_id = br->br_id;
-	opened = atomic_read(&br->br_count);
-	if (unlikely(opened)) {
-		to_free = au_array_alloc(&opened, empty_cb, sb, NULL);
-		err = PTR_ERR(to_free);
-		if (IS_ERR(to_free))
-			goto out;
-
-		err = test_file_busy(sb, br_id, to_free, opened);
-		if (unlikely(err)) {
-			AuVerbose(verbose, "%llu file(s) opened\n", opened);
-			goto out;
-		}
-	}
-
-	wbr = br->br_wbr;
-	do_wh = wbr && (wbr->wbr_whbase || wbr->wbr_plink || wbr->wbr_orph);
-	if (do_wh) {
-		/* instead of WbrWhMustWriteLock(wbr) */
-		SiMustWriteLock(sb);
-		for (i = 0; i < AuBrWh_Last; i++) {
-			dput(wbr->wbr_wh[i]);
-			wbr->wbr_wh[i] = NULL;
-		}
-	}
-
-	err = test_children_busy(root, bindex, verbose);
-	if (unlikely(err)) {
-		if (do_wh)
-			goto out_wh;
-		goto out;
-	}
-
-	err = 0;
-	if (to_free) {
-		/*
-		 * now we confirmed the branch is deletable.
-		 * let's free the remaining opened dirs on the branch.
-		 */
-		di_write_unlock(root);
-		br_del_file(to_free, opened, br_id);
-		di_write_lock_child(root);
-	}
-
-	if (!remount)
-		au_br_do_del(sb, bindex, br);
-	else {
-		sysaufs_brs_del(sb, bindex);
-		au_br_do_del(sb, bindex, br);
-		sysaufs_brs_add(sb, bindex);
-	}
-
-	if (!bindex) {
-		au_cpup_attr_all(d_inode(root), /*force*/1);
-		sb->s_maxbytes = au_sbr_sb(sb, 0)->s_maxbytes;
-	} else
-		au_sub_nlink(d_inode(root), d_inode(del->h_path.dentry));
-	if (au_opt_test(mnt_flags, PLINK))
-		au_plink_half_refresh(sb, br_id);
-
-	if (au_xino_brid(sb) == br_id)
-		au_xino_brid_set(sb, -1);
-	goto out; /* success */
-
-out_wh:
-	/* revert */
-	rerr = au_br_init_wh(sb, br, br->br_perm);
-	if (rerr)
-		pr_warn("failed re-creating base whiteout, %s. (%d)\n",
-			del->pathname, rerr);
-out:
-	if (to_free)
-		au_farray_free(to_free, opened);
-	return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_ibusy(struct super_block *sb, struct aufs_ibusy __user *arg)
-{
-	int err;
-	aufs_bindex_t bstart, bend;
-	struct aufs_ibusy ibusy;
-	struct inode *inode, *h_inode;
-
-	err = -EPERM;
-	if (unlikely(!capable(CAP_SYS_ADMIN)))
-		goto out;
-
-	err = copy_from_user(&ibusy, arg, sizeof(ibusy));
-	if (!err)
-		err = !access_ok(VERIFY_WRITE, &arg->h_ino, sizeof(arg->h_ino));
-	if (unlikely(err)) {
-		err = -EFAULT;
-		AuTraceErr(err);
-		goto out;
-	}
-
-	err = -EINVAL;
-	si_read_lock(sb, AuLock_FLUSH);
-	if (unlikely(ibusy.bindex < 0 || ibusy.bindex > au_sbend(sb)))
-		goto out_unlock;
-
-	err = 0;
-	ibusy.h_ino = 0; /* invalid */
-	inode = ilookup(sb, ibusy.ino);
-	if (!inode
-	    || inode->i_ino == AUFS_ROOT_INO
-	    || is_bad_inode(inode))
-		goto out_unlock;
-
-	ii_read_lock_child(inode);
-	bstart = au_ibstart(inode);
-	bend = au_ibend(inode);
-	if (bstart <= ibusy.bindex && ibusy.bindex <= bend) {
-		h_inode = au_h_iptr(inode, ibusy.bindex);
-		if (h_inode && au_test_ibusy(inode, bstart, bend))
-			ibusy.h_ino = h_inode->i_ino;
-	}
-	ii_read_unlock(inode);
-	iput(inode);
-
-out_unlock:
-	si_read_unlock(sb);
-	if (!err) {
-		err = __put_user(ibusy.h_ino, &arg->h_ino);
-		if (unlikely(err)) {
-			err = -EFAULT;
-			AuTraceErr(err);
-		}
-	}
-out:
-	return err;
-}
-
-long au_ibusy_ioctl(struct file *file, unsigned long arg)
-{
-	return au_ibusy(file->f_path.dentry->d_sb, (void __user *)arg);
-}
-
-#ifdef CONFIG_COMPAT
-long au_ibusy_compat_ioctl(struct file *file, unsigned long arg)
-{
-	return au_ibusy(file->f_path.dentry->d_sb, compat_ptr(arg));
-}
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * change a branch permission
- */
-
-static void au_warn_ima(void)
-{
-#ifdef CONFIG_IMA
-	/* since it doesn't support mark_files_ro() */
-	AuWarn1("RW -> RO makes IMA to produce wrong message\n");
-#endif
-}
-
-static int do_need_sigen_inc(int a, int b)
-{
-	return au_br_whable(a) && !au_br_whable(b);
-}
-
-static int need_sigen_inc(int old, int new)
-{
-	return do_need_sigen_inc(old, new)
-		|| do_need_sigen_inc(new, old);
-}
-
-static int au_br_mod_files_ro(struct super_block *sb, aufs_bindex_t bindex)
-{
-	int err, do_warn;
-	unsigned int mnt_flags;
-	unsigned long long ull, max;
-	aufs_bindex_t br_id;
-	unsigned char verbose, writer;
-	struct file *file, *hf, **array;
-	struct au_hfile *hfile;
-
-	mnt_flags = au_mntflags(sb);
-	verbose = !!au_opt_test(mnt_flags, VERBOSE);
-
-	array = au_farray_alloc(sb, &max);
-	err = PTR_ERR(array);
-	if (IS_ERR(array))
-		goto out;
-
-	do_warn = 0;
-	br_id = au_sbr_id(sb, bindex);
-	for (ull = 0; ull < max; ull++) {
-		file = array[ull];
-		if (unlikely(!file))
-			break;
-
-		/* AuDbg("%pD\n", file); */
-		fi_read_lock(file);
-		if (unlikely(au_test_mmapped(file))) {
-			err = -EBUSY;
-			AuVerbose(verbose, "mmapped %pD\n", file);
-			AuDbgFile(file);
-			FiMustNoWaiters(file);
-			fi_read_unlock(file);
-			goto out_array;
-		}
-
-		hfile = &au_fi(file)->fi_htop;
-		hf = hfile->hf_file;
-		if (!d_is_reg(file->f_path.dentry)
-		    || !(file->f_mode & FMODE_WRITE)
-		    || hfile->hf_br->br_id != br_id
-		    || !(hf->f_mode & FMODE_WRITE))
-			array[ull] = NULL;
-		else {
-			do_warn = 1;
-			get_file(file);
-		}
-
-		FiMustNoWaiters(file);
-		fi_read_unlock(file);
-		fput(file);
-	}
-
-	err = 0;
-	if (do_warn)
-		au_warn_ima();
-
-	for (ull = 0; ull < max; ull++) {
-		file = array[ull];
-		if (!file)
-			continue;
-
-		/* todo: already flushed? */
-		/*
-		 * fs/super.c:mark_files_ro() is gone, but aufs keeps its
-		 * approach which resets f_mode and calls mnt_drop_write() and
-		 * file_release_write() for each file, because the branch
-		 * attribute in aufs world is totally different from the native
-		 * fs rw/ro mode.
-		*/
-		/* fi_read_lock(file); */
-		hfile = &au_fi(file)->fi_htop;
-		hf = hfile->hf_file;
-		/* fi_read_unlock(file); */
-		spin_lock(&hf->f_lock);
-		writer = !!(hf->f_mode & FMODE_WRITER);
-		hf->f_mode &= ~(FMODE_WRITE | FMODE_WRITER);
-		spin_unlock(&hf->f_lock);
-		if (writer) {
-			put_write_access(file_inode(hf));
-			__mnt_drop_write(hf->f_path.mnt);
-		}
-	}
-
-out_array:
-	au_farray_free(array, max);
-out:
-	AuTraceErr(err);
-	return err;
-}
-
-int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount,
-	      int *do_refresh)
-{
-	int err, rerr;
-	aufs_bindex_t bindex;
-	struct dentry *root;
-	struct au_branch *br;
-	struct au_br_fhsm *bf;
-
-	root = sb->s_root;
-	bindex = au_find_dbindex(root, mod->h_root);
-	if (bindex < 0) {
-		if (remount)
-			return 0; /* success */
-		err = -ENOENT;
-		pr_err("%s no such branch\n", mod->path);
-		goto out;
-	}
-	AuDbg("bindex b%d\n", bindex);
-
-	err = test_br(d_inode(mod->h_root), mod->perm, mod->path);
-	if (unlikely(err))
-		goto out;
-
-	br = au_sbr(sb, bindex);
-	AuDebugOn(mod->h_root != au_br_dentry(br));
-	if (br->br_perm == mod->perm)
-		return 0; /* success */
-
-	/* pre-allocate for non-fhsm --> fhsm */
-	bf = NULL;
-	if (!au_br_fhsm(br->br_perm) && au_br_fhsm(mod->perm)) {
-		err = au_fhsm_br_alloc(br);
-		if (unlikely(err))
-			goto out;
-		bf = br->br_fhsm;
-		br->br_fhsm = NULL;
-	}
-
-	if (au_br_writable(br->br_perm)) {
-		/* remove whiteout base */
-		err = au_br_init_wh(sb, br, mod->perm);
-		if (unlikely(err))
-			goto out_bf;
-
-		if (!au_br_writable(mod->perm)) {
-			/* rw --> ro, file might be mmapped */
-			DiMustNoWaiters(root);
-			IiMustNoWaiters(d_inode(root));
-			di_write_unlock(root);
-			err = au_br_mod_files_ro(sb, bindex);
-			/* aufs_write_lock() calls ..._child() */
-			di_write_lock_child(root);
-
-			if (unlikely(err)) {
-				rerr = -ENOMEM;
-				br->br_wbr = kzalloc(sizeof(*br->br_wbr),
-						     GFP_NOFS);
-				if (br->br_wbr)
-					rerr = au_wbr_init(br, sb, br->br_perm);
-				if (unlikely(rerr)) {
-					AuIOErr("nested error %d (%d)\n",
-						rerr, err);
-					br->br_perm = mod->perm;
-				}
-			}
-		}
-	} else if (au_br_writable(mod->perm)) {
-		/* ro --> rw */
-		err = -ENOMEM;
-		br->br_wbr = kzalloc(sizeof(*br->br_wbr), GFP_NOFS);
-		if (br->br_wbr) {
-			err = au_wbr_init(br, sb, mod->perm);
-			if (unlikely(err)) {
-				kfree(br->br_wbr);
-				br->br_wbr = NULL;
-			}
-		}
-	}
-	if (unlikely(err))
-		goto out_bf;
-
-	if (au_br_fhsm(br->br_perm)) {
-		if (!au_br_fhsm(mod->perm)) {
-			/* fhsm --> non-fhsm */
-			au_br_fhsm_fin(br->br_fhsm);
-			kfree(br->br_fhsm);
-			br->br_fhsm = NULL;
-		}
-	} else if (au_br_fhsm(mod->perm))
-		/* non-fhsm --> fhsm */
-		br->br_fhsm = bf;
-
-	*do_refresh |= need_sigen_inc(br->br_perm, mod->perm);
-	br->br_perm = mod->perm;
-	goto out; /* success */
-
-out_bf:
-	kfree(bf);
-out:
-	AuTraceErr(err);
-	return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_br_stfs(struct au_branch *br, struct aufs_stfs *stfs)
-{
-	int err;
-	struct kstatfs kstfs;
-
-	err = vfs_statfs(&br->br_path, &kstfs);
-	if (!err) {
-		stfs->f_blocks = kstfs.f_blocks;
-		stfs->f_bavail = kstfs.f_bavail;
-		stfs->f_files = kstfs.f_files;
-		stfs->f_ffree = kstfs.f_ffree;
-	}
-
-	return err;
-}