C++ (Cpp) au_hn_free Examples

Example #1

File: i_op_del.c Project: shinsec/linux-parrot

/*
 * when removing a dir, rename it to a unique temporary whiteout-ed name first
 * in order to be revertible and save time for removing many child whiteouts
 * under the dir.
 * returns 1 when there are too many child whiteout and caller should remove
 * them asynchronously. returns 0 when the number of children is enough small to
 * remove now or the branch fs is a remote fs.
 * otherwise return an error.
 */
static int renwh_and_rmdir(struct dentry *dentry, aufs_bindex_t bindex,
			   struct au_nhash *whlist, struct inode *dir)
{
	int rmdir_later, err, dirwh;
	struct dentry *h_dentry;
	struct super_block *sb;
	struct inode *inode;

	sb = dentry->d_sb;
	SiMustAnyLock(sb);
	h_dentry = au_h_dptr(dentry, bindex);
	err = au_whtmp_ren(h_dentry, au_sbr(sb, bindex));
	if (unlikely(err))
		goto out;

	/* stop monitoring */
	inode = d_inode(dentry);
	au_hn_free(au_hi(inode, bindex));

	if (!au_test_fs_remote(h_dentry->d_sb)) {
		dirwh = au_sbi(sb)->si_dirwh;
		rmdir_later = (dirwh <= 1);
		if (!rmdir_later)
			rmdir_later = au_nhash_test_longer_wh(whlist, bindex,
							      dirwh);
		if (rmdir_later)
			return rmdir_later;
	}

	err = au_whtmp_rmdir(dir, bindex, h_dentry, whlist);
	if (unlikely(err)) {
		AuIOErr("rmdir %pd, b%d failed, %d. ignored\n",
			h_dentry, bindex, err);
		err = 0;
	}

out:
	AuTraceErr(err);
	return err;
}

Example #2

int aufs_rmdir(struct inode *dir, struct dentry *dentry)
{
	int err, rmdir_later;
	aufs_bindex_t bwh, bindex, bstart;
	struct au_dtime dt;
	struct au_pin pin;
	struct inode *inode;
	struct dentry *parent, *wh_dentry, *h_dentry;
	struct au_whtmp_rmdir *args;

	IMustLock(dir);

	err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_GEN);
	if (unlikely(err))
		goto out;
	err = au_alive_dir(dentry);
	if (unlikely(err))
		goto out_unlock;
	inode = dentry->d_inode;
	IMustLock(inode);
	err = -ENOTDIR;
	if (unlikely(!S_ISDIR(inode->i_mode)))
		goto out_unlock; /* possible? */

	err = -ENOMEM;
	args = au_whtmp_rmdir_alloc(dir->i_sb, GFP_NOFS);
	if (unlikely(!args))
		goto out_unlock;

	parent = dentry->d_parent; /* dir inode is locked */
	di_write_lock_parent(parent);
	err = au_test_empty(dentry, &args->whlist);
	if (unlikely(err))
		goto out_parent;

	bstart = au_dbstart(dentry);
	bwh = au_dbwh(dentry);
	bindex = -1;
	wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/1, &bindex, &dt, &pin);
	err = PTR_ERR(wh_dentry);
	if (IS_ERR(wh_dentry))
		goto out_parent;

	h_dentry = au_h_dptr(dentry, bstart);
	dget(h_dentry);
	rmdir_later = 0;
	if (bindex == bstart) {
		err = renwh_and_rmdir(dentry, bstart, &args->whlist, dir);
		if (err > 0) {
			rmdir_later = err;
			err = 0;
		}
	} else {
		/* stop monitoring */
		au_hn_free(au_hi(inode, bstart));

		/* dir inode is locked */
		IMustLock(wh_dentry->d_parent->d_inode);
		err = 0;
	}

	if (!err) {
		vfsub_dead_dir(inode);
		au_set_dbdiropq(dentry, -1);
		epilog(dir, dentry, bindex);

		if (rmdir_later) {
			au_whtmp_kick_rmdir(dir, bstart, h_dentry, args);
			args = NULL;
		}

		goto out_unpin; /* success */
	}

	/* revert */
	AuLabel(revert);
	if (wh_dentry) {
		int rerr;

		rerr = do_revert(err, dir, bindex, bwh, wh_dentry, dentry, &dt);
		if (rerr)
			err = rerr;
	}

out_unpin:
	au_unpin(&pin);
	dput(wh_dentry);
	dput(h_dentry);
out_parent:
	di_write_unlock(parent);
	if (args)
		au_whtmp_rmdir_free(args);
out_unlock:
	aufs_read_unlock(dentry, AuLock_DW);
out:
	AuTraceErr(err);
	return err;
}