Esempio n. 1
0
static int au_dpages_append(struct au_dcsub_pages *dpages,
			    struct dentry *dentry, gfp_t gfp)
{
	int err, sz;
	struct au_dpage *dpage;
	void *p;

	//TraceEnter();

	dpage = dpages->dpages + dpages->ndpage - 1;
	AuDebugOn(!dpage);
	sz = PAGE_SIZE / sizeof(dentry);
	if (unlikely(dpage->ndentry >= sz)) {
		LKTRLabel(new dpage);
		err = -ENOMEM;
		sz = dpages->ndpage * sizeof(*dpages->dpages);
		p = au_kzrealloc(dpages->dpages, sz,
				 sz + sizeof(*dpages->dpages), gfp);
		if (unlikely(!p))
			goto out;
		dpage = dpages->dpages + dpages->ndpage;
		p = (void*)__get_free_page(gfp);
		if (unlikely(!p))
			goto out;
		dpage->ndentry = 0;
		dpage->dentries = p;
		dpages->ndpage++;
	}

	dpage->dentries[dpage->ndentry++] = dget(dentry);
	return 0; /* success */

 out:
	//TraceErr(err);
	return err;
}
Esempio n. 2
0
int aufs_rmdir(struct inode *dir, struct dentry *dentry)
{
	int err, rmdir_later;
	struct inode *inode, *hidden_dir;
	struct dentry *parent, *wh_dentry, *hidden_dentry, *hidden_parent;
	struct dtime dt;
	aufs_bindex_t bwh, bindex, bstart;
	struct rmdir_whtmp_arg *arg;
	struct aufs_nhash *whlist;

	LKTRTrace("i%lu, %.*s\n", dir->i_ino, DLNPair(dentry));
	IMustLock(dir);
	inode = dentry->d_inode;
	if (unlikely(!inode))
		return -ENOENT; // possible?
	IMustLock(inode);

	whlist = nhash_new(GFP_KERNEL);
	err = PTR_ERR(whlist);
	if (IS_ERR(whlist))
		goto out;

	err = -ENOMEM;
	arg = kmalloc(sizeof(*arg), GFP_KERNEL);
	//arg = NULL;
	if (unlikely(!arg))
		goto out_whlist;

	aufs_read_lock(dentry, AUFS_D_WLOCK);
	parent = dentry->d_parent;
	di_write_lock_parent(parent);
	err = test_empty(dentry, whlist);
	//err = -1;
	if (unlikely(err))
		goto out_arg;

	bstart = dbstart(dentry);
	bwh = dbwh(dentry);
	bindex = -1;
	wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/ 1, &bindex, &dt);
	//wh_dentry = ERR_PTR(-1);
	err = PTR_ERR(wh_dentry);
	if (IS_ERR(wh_dentry))
		goto out_arg;

	hidden_dentry = au_h_dptr(dentry);
	dget(hidden_dentry);
	hidden_parent = hidden_dentry->d_parent;
	hidden_dir = hidden_parent->d_inode;

	rmdir_later = 0;
	if (bindex == bstart) {
		IMustLock(hidden_dir);
		err = renwh_and_rmdir(dentry, bstart, whlist, dir);
		//err = -1;
		if (err > 0) {
			rmdir_later = err;
			err = 0;
		}
	} else {
		DEBUG_ON(!wh_dentry);
		hidden_parent = wh_dentry->d_parent;
		DEBUG_ON(hidden_parent != au_h_dptr_i(parent, bindex));
		hidden_dir = hidden_parent->d_inode;
		IMustLock(hidden_dir);
		err = 0;
	}

	if (!err) {
		au_reset_hinotify(inode, /*flags*/0);
		inode->i_nlink = 0;
		set_dbdiropq(dentry, -1);
		epilog(dir, dentry, bindex);

		if (rmdir_later) {
			kick_rmdir_whtmp(hidden_dentry, whlist, bstart, dir,
					 inode, arg);
			arg = NULL;
		}

		goto out_unlock; /* success */
	}

	/* revert */
	LKTRLabel(revert);
	if (wh_dentry) {
		int rerr;
		rerr = do_revert(err, wh_dentry, dentry, bwh, &dt,
				 need_dlgt(dir->i_sb));
		if (rerr)
			err = rerr;
	}

 out_unlock:
	hdir_unlock(hidden_dir, dir, bindex);
	dput(wh_dentry);
	dput(hidden_dentry);
 out_arg:
	di_write_unlock(parent);
	aufs_read_unlock(dentry, AUFS_D_WLOCK);
	kfree(arg);
 out_whlist:
	nhash_del(whlist);
 out:
	TraceErr(err);
	return err;
}
Esempio n. 3
0
static struct dentry *
aufs_decode_fh(struct super_block *sb, __u32 *fh, int fh_len, int fh_type,
	       int (*acceptable)(void *context, struct dentry *de),
	       void *context)
{
	struct dentry *dentry;
	ino_t ino, dir_ino;
	aufs_bindex_t bindex;
	struct au_nfsd_si_lock nsi_lock = {
		.sigen		= fh[Fh_sigen],
		.br_id		= fh[Fh_br_id],
		.force_lock	= 0
	};

	LKTRTrace("%d, fh{br_id %u, sigen %u, i%u, diri%u, g%u}\n",
		  fh_type, fh[Fh_br_id], fh[Fh_sigen], fh[Fh_ino],
		  fh[Fh_dir_ino], fh[Fh_igen]);
	AuDebugOn(fh_len < Fh_tail);

	dentry = ERR_PTR(-ESTALE);
	/* branch id may be wrapped around */
	bindex = si_nfsd_read_lock(sb, &nsi_lock);
	if (unlikely(bindex < 0))
		goto out;
	nsi_lock.force_lock = 1;

	/* is this inode still cached? */
	ino = decode_ino(fh + Fh_ino);
	AuDebugOn(ino == AUFS_ROOT_INO);
	dir_ino = decode_ino(fh + Fh_dir_ino);
	dentry = decode_by_ino(sb, ino, dir_ino);
	if (IS_ERR(dentry))
		goto out_unlock;
	if (dentry)
		goto accept;

	/* is the parent dir cached? */
	dentry = decode_by_dir_ino(sb, ino, dir_ino, &nsi_lock);
	if (IS_ERR(dentry))
		goto out_unlock;
	if (dentry)
		goto accept;

	/* lookup path */
	dentry = decode_by_path(sb, bindex, ino, fh, fh_len, &nsi_lock);
	if (IS_ERR(dentry))
		goto out_unlock;
	if (unlikely(!dentry))
		goto out_unlock;

 accept:
	LKTRLabel(accept);
	if (dentry->d_inode->i_generation == fh[Fh_igen]
	    && acceptable(context, dentry))
		goto out_unlock; /* success */

	LKTRLabel(stale);
	dput(dentry);
	dentry = ERR_PTR(-ESTALE);
 out_unlock:
	LKTRLabel(out_unlock);
	si_read_unlock(sb);
 out:
	LKTRLabel(out);
	if (0 && IS_ERR(dentry))
		dentry = ERR_PTR(-ESTALE);
	AuTraceErrPtr(dentry);
	return dentry;
}

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24)
static struct dentry *
aufs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len,
		  int fh_type)
{
	return aufs_decode_fh(sb, fid->raw, fh_len, fh_type, h_acceptable,
			      /*context*/NULL);
}
#endif /* KERNEL_VERSION */

/* ---------------------------------------------------------------------- */

static int aufs_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len,
			  int connectable)
{
	int err;
	aufs_bindex_t bindex, bend;
	struct super_block *sb, *h_sb;
	struct inode *inode;
	struct dentry *parent, *h_parent;
	struct au_branch *br;

	LKTRTrace("%.*s, max %d, conn %d\n",
		  AuDLNPair(dentry), *max_len, connectable);
	AuDebugOn(au_test_anon(dentry));

	parent = NULL;
	err = -ENOSPC;
	if (unlikely(*max_len <= Fh_tail)) {
		AuWarn1("NFSv2 client (max_len %d)?\n", *max_len);
		goto out;
	}

	err = 0; //FILEID_ROOT;
	if (IS_ROOT(dentry)) {
		AuDebugOn(dentry->d_inode->i_ino != AUFS_ROOT_INO);
		goto out;
	}

	err = -EIO;
	h_parent = NULL;
	sb = dentry->d_sb;
	aufs_read_lock(dentry, AuLock_FLUSH | AuLock_IR);
	parent = dget_parent(dentry);
	di_read_lock_parent(parent, !AuLock_IR);
	inode = dentry->d_inode;
	AuDebugOn(!inode);
#ifdef CONFIG_AUFS_DEBUG
	{
		unsigned int mnt_flags = au_mntflags(sb);

		if (unlikely(!au_opt_test_xino(mnt_flags)))
			AuWarn1("NFS-exporting requires xino\n");
		if (unlikely(0 && !au_opt_test(mnt_flags, UDBA_INOTIFY)))
			AuWarn1("udba=inotify is recommended "
				"for NFS-exporting\n");
	}
#endif

	bend = au_dbtaildir(parent);
	for (bindex = au_dbstart(parent); bindex <= bend; bindex++) {
		h_parent = au_h_dptr(parent, bindex);
		if (h_parent) {
			dget(h_parent);
			break;
		}
	}
	if (unlikely(!h_parent))
		goto out_unlock;
	LKTRTrace("b%d\n", bindex);

	err = -EPERM;
	br = au_sbr(sb, bindex);
	h_sb = br->br_mnt->mnt_sb;
	if (unlikely(!h_sb->s_export_op)) {
		AuErr1("%s branch is not exportable\n", au_sbtype(h_sb));
		goto out_dput;
	}

	fh[Fh_br_id] = br->br_id;
	fh[Fh_sigen] = au_sigen(sb);
	encode_ino(fh + Fh_ino, inode->i_ino);
	encode_ino(fh + Fh_dir_ino, parent->d_inode->i_ino);
	fh[Fh_igen] = inode->i_generation;

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 24)
	/* it should be set at exporting time */
	if (unlikely(!h_sb->s_export_op->find_exported_dentry)) {
		AuWarn("set default find_exported_dentry for %s\n",
		       au_sbtype(h_sb));
		h_sb->s_export_op->find_exported_dentry = find_exported_dentry;
	}
#endif

	*max_len -= Fh_tail;
	fh[Fh_h_type] = au_call_encode_fh(h_parent, fh + Fh_tail, max_len,
					  /*connectable or subtreecheck*/0);
	err = fh[Fh_h_type];
	*max_len += Fh_tail;
	/* todo: macros? */
	if (err != 255)
		err = 99;
	else
		AuWarn1("%s encode_fh failed\n", au_sbtype(h_sb));

 out_dput:
	dput(h_parent);
 out_unlock:
	di_read_unlock(parent, !AuLock_IR);
	dput(parent);
	aufs_read_unlock(dentry, AuLock_IR);
 out:
	AuTraceErr(err);
	if (unlikely(err < 0))
		err = 255;
	return err;
}