예제 #1
0
파일: dir.c 프로젝트: JanLuca/aufs4-debian
static void au_do_dir_ts(void *arg)
{
	struct au_dir_ts_arg *a = arg;
	struct au_dtime dt;
	struct path h_path;
	struct inode *dir, *h_dir;
	struct super_block *sb;
	struct au_branch *br;
	struct au_hinode *hdir;
	int err;
	aufs_bindex_t btop, bindex;

	sb = a->dentry->d_sb;
	if (d_really_is_negative(a->dentry))
		goto out;
	/* no dir->i_mutex lock */
	aufs_read_lock(a->dentry, AuLock_DW); /* noflush */

	dir = d_inode(a->dentry);
	btop = au_ibtop(dir);
	bindex = au_br_index(sb, a->brid);
	if (bindex < btop)
		goto out_unlock;

	br = au_sbr(sb, bindex);
	h_path.dentry = au_h_dptr(a->dentry, bindex);
	if (!h_path.dentry)
		goto out_unlock;
	h_path.mnt = au_br_mnt(br);
	au_dtime_store(&dt, a->dentry, &h_path);

	br = au_sbr(sb, btop);
	if (!au_br_writable(br->br_perm))
		goto out_unlock;
	h_path.dentry = au_h_dptr(a->dentry, btop);
	h_path.mnt = au_br_mnt(br);
	err = vfsub_mnt_want_write(h_path.mnt);
	if (err)
		goto out_unlock;
	hdir = au_hi(dir, btop);
	au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT);
	h_dir = au_h_iptr(dir, btop);
	if (h_dir->i_nlink
	    && timespec_compare(&h_dir->i_mtime, &dt.dt_mtime) < 0) {
		dt.dt_h_path = h_path;
		au_dtime_revert(&dt);
	}
	au_hn_inode_unlock(hdir);
	vfsub_mnt_drop_write(h_path.mnt);
	au_cpup_attr_timesizes(dir);

out_unlock:
	aufs_read_unlock(a->dentry, AuLock_DW);
out:
	dput(a->dentry);
	au_nwt_done(&au_sbi(sb)->si_nowait);
	kfree(arg);
}
예제 #2
0
/*
 * if valid returns 1, otherwise 0.
 */
static int aufs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
{
	int valid, err;
	unsigned int sigen;
	unsigned char do_udba;
	struct super_block *sb;
	struct inode *inode;

	err = -EINVAL;
	sb = dentry->d_sb;
	inode = dentry->d_inode;
	aufs_read_lock(dentry, AuLock_FLUSH | AuLock_DW);
	sigen = au_sigen(sb);
	if (au_digen(dentry) != sigen) {
		AuDebugOn(IS_ROOT(dentry));
		if (inode)
			err = au_reval_dpath(dentry, sigen);
		if (unlikely(err))
			goto out_dgrade;
		AuDebugOn(au_digen(dentry) != sigen);
	}
	if (inode && au_iigen(inode) != sigen) {
		AuDebugOn(IS_ROOT(dentry));
		err = au_refresh_hinode(inode, dentry);
		if (unlikely(err))
			goto out_dgrade;
		AuDebugOn(au_iigen(inode) != sigen);
	}
	di_downgrade_lock(dentry, AuLock_IR);

	AuDebugOn(au_digen(dentry) != sigen);
	AuDebugOn(inode && au_iigen(inode) != sigen);
	err = -EINVAL;
	do_udba = !au_opt_test(au_mntflags(sb), UDBA_NONE);
	if (do_udba && inode) {
		aufs_bindex_t bstart = au_ibstart(inode);

		if (bstart >= 0
		    && au_test_higen(inode, au_h_iptr(inode, bstart)))
			goto out;
	}

	err = h_d_revalidate(dentry, inode, nd, do_udba);
	if (unlikely(!err && do_udba && au_dbstart(dentry) < 0))
		/* both of real entry and whiteout found */
		err = -EIO;
	goto out;

 out_dgrade:
	di_downgrade_lock(dentry, AuLock_IR);
 out:
	aufs_read_unlock(dentry, AuLock_IR);
	AuTraceErr(err);
	valid = !err;
	if (!valid)
		AuDbg("%.*s invalid\n", AuDLNPair(dentry));
	return valid;
}
예제 #3
0
static int au_wbr_fd(struct path *path)
{
	int err, fd;
	aufs_bindex_t wbi, bindex, bend;
	struct file *h_file;
	struct super_block *sb;
	struct dentry *root;
	struct au_branch *wbr;

	err = get_unused_fd();
	if (unlikely(err < 0))
		goto out;
	fd = err;

	wbi = 0;
	sb = path->dentry->d_sb;
	root = sb->s_root;
	aufs_read_lock(root, AuLock_IR);
	wbr = au_sbr(sb, wbi);
	if (!(path->mnt->mnt_flags & MNT_READONLY)
	    && !au_br_writable(wbr->br_perm)) {
		bend = au_sbend(sb);
		for (bindex = 1; bindex <= bend; bindex++) {
			wbr = au_sbr(sb, bindex);
			if (au_br_writable(wbr->br_perm)) {
				wbi = bindex;
				break;
			}
		}
		wbr = au_sbr(sb, wbi);
	}
	AuDbg("wbi %d\n", wbi);
	h_file = au_h_open(root, wbi, O_RDONLY | O_DIRECTORY | O_LARGEFILE,
			   NULL);
	aufs_read_unlock(root, AuLock_IR);
	err = PTR_ERR(h_file);
	if (IS_ERR(h_file))
		goto out_fd;

	atomic_dec(&wbr->br_count); /* cf. au_h_open() */
	fd_install(fd, h_file);
	err = fd;
	goto out; /* success */

out_fd:
	put_unused_fd(fd);
out:
	return err;
}
예제 #4
0
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;
}
예제 #5
0
파일: opts.c 프로젝트: bjayesh/chandra
	/* reduce stack space */
	union {
		struct au_opt_add *add;
		struct au_opt_del *del;
		struct au_opt_mod *mod;
		struct au_opt_xino *xino;
		struct au_opt_xino_itrunc *xino_itrunc;
		struct au_opt_wbr_create *create;
	} u;
	struct au_opt *opt;

	opt = opts->opt;
	while (opt->type != Opt_tail) {
		switch (opt->type) {
		case Opt_add:
			u.add = &opt->add;
			AuDbg("add {b%d, %s, 0x%x, %p}\n",
				  u.add->bindex, u.add->pathname, u.add->perm,
				  u.add->path.dentry);
			break;
		case Opt_del:
		case Opt_idel:
			u.del = &opt->del;
			AuDbg("del {%s, %p}\n",
			      u.del->pathname, u.del->h_path.dentry);
			break;
		case Opt_mod:
		case Opt_imod:
			u.mod = &opt->mod;
			AuDbg("mod {%s, 0x%x, %p}\n",
				  u.mod->path, u.mod->perm, u.mod->h_root);
			break;
		case Opt_append:
			u.add = &opt->add;
			AuDbg("append {b%d, %s, 0x%x, %p}\n",
				  u.add->bindex, u.add->pathname, u.add->perm,
				  u.add->path.dentry);
			break;
		case Opt_prepend:
			u.add = &opt->add;
			AuDbg("prepend {b%d, %s, 0x%x, %p}\n",
				  u.add->bindex, u.add->pathname, u.add->perm,
				  u.add->path.dentry);
			break;
		case Opt_dirwh:
			AuDbg("dirwh %d\n", opt->dirwh);
			break;
		case Opt_rdcache:
			AuDbg("rdcache %d\n", opt->rdcache);
			break;
		case Opt_rdblk:
			AuDbg("rdblk %u\n", opt->rdblk);
			break;
		case Opt_rdblk_def:
			AuDbg("rdblk_def\n");
			break;
		case Opt_rdhash:
			AuDbg("rdhash %u\n", opt->rdhash);
			break;
		case Opt_rdhash_def:
			AuDbg("rdhash_def\n");
			break;
		case Opt_xino:
			u.xino = &opt->xino;
			AuDbg("xino {%s %.*s}\n",
				  u.xino->path,
				  AuDLNPair(u.xino->file->f_dentry));
			break;
		case Opt_trunc_xino:
			AuLabel(trunc_xino);
			break;
		case Opt_notrunc_xino:
			AuLabel(notrunc_xino);
			break;
		case Opt_trunc_xino_path:
		case Opt_itrunc_xino:
			u.xino_itrunc = &opt->xino_itrunc;
			AuDbg("trunc_xino %d\n", u.xino_itrunc->bindex);
			break;

		case Opt_noxino:
			AuLabel(noxino);
			break;
		case Opt_trunc_xib:
			AuLabel(trunc_xib);
			break;
		case Opt_notrunc_xib:
			AuLabel(notrunc_xib);
			break;
		case Opt_shwh:
			AuLabel(shwh);
			break;
		case Opt_noshwh:
			AuLabel(noshwh);
			break;
		case Opt_plink:
			AuLabel(plink);
			break;
		case Opt_noplink:
			AuLabel(noplink);
			break;
		case Opt_list_plink:
			AuLabel(list_plink);
			break;
		case Opt_udba:
			AuDbg("udba %d, %s\n",
				  opt->udba, au_optstr_udba(opt->udba));
			break;
		case Opt_dio:
			AuLabel(dio);
			break;
		case Opt_nodio:
			AuLabel(nodio);
			break;
		case Opt_diropq_a:
			AuLabel(diropq_a);
			break;
		case Opt_diropq_w:
			AuLabel(diropq_w);
			break;
		case Opt_warn_perm:
			AuLabel(warn_perm);
			break;
		case Opt_nowarn_perm:
			AuLabel(nowarn_perm);
			break;
		case Opt_refrof:
			AuLabel(refrof);
			break;
		case Opt_norefrof:
			AuLabel(norefrof);
			break;
		case Opt_verbose:
			AuLabel(verbose);
			break;
		case Opt_noverbose:
			AuLabel(noverbose);
			break;
		case Opt_sum:
			AuLabel(sum);
			break;
		case Opt_nosum:
			AuLabel(nosum);
			break;
		case Opt_wsum:
			AuLabel(wsum);
			break;
		case Opt_wbr_create:
			u.create = &opt->wbr_create;
			AuDbg("create %d, %s\n", u.create->wbr_create,
				  au_optstr_wbr_create(u.create->wbr_create));
			switch (u.create->wbr_create) {
			case AuWbrCreate_MFSV:
			case AuWbrCreate_PMFSV:
				AuDbg("%d sec\n", u.create->mfs_second);
				break;
			case AuWbrCreate_MFSRR:
				AuDbg("%llu watermark\n",
					  u.create->mfsrr_watermark);
				break;
			case AuWbrCreate_MFSRRV:
				AuDbg("%llu watermark, %d sec\n",
					  u.create->mfsrr_watermark,
					  u.create->mfs_second);
				break;
			}
			break;
		case Opt_wbr_copyup:
			AuDbg("copyup %d, %s\n", opt->wbr_copyup,
				  au_optstr_wbr_copyup(opt->wbr_copyup));
			break;
		default:
			BUG();
		}
		opt++;
	}
#endif
}

void au_opts_free(struct au_opts *opts)
{
	struct au_opt *opt;

	opt = opts->opt;
	while (opt->type != Opt_tail) {
		switch (opt->type) {
		case Opt_add:
		case Opt_append:
		case Opt_prepend:
			path_put(&opt->add.path);
			break;
		case Opt_del:
		case Opt_idel:
			path_put(&opt->del.h_path);
			break;
		case Opt_mod:
		case Opt_imod:
			dput(opt->mod.h_root);
			break;
		case Opt_xino:
			fput(opt->xino.file);
			break;
		}
		opt++;
	}
}

static int opt_add(struct au_opt *opt, char *opt_str, unsigned long sb_flags,
		   aufs_bindex_t bindex)
{
	int err;
	struct au_opt_add *add = &opt->add;
	char *p;

	add->bindex = bindex;
	add->perm = AuBrPerm_RO;
	add->pathname = opt_str;
	p = strchr(opt_str, '=');
	if (p) {
		*p++ = 0;
		if (*p)
			add->perm = br_perm_val(p);
	}

	err = vfsub_kern_path(add->pathname, lkup_dirflags, &add->path);
	if (!err) {
		if (!p) {
			add->perm = AuBrPerm_RO;
			if (au_test_fs_rr(add->path.dentry->d_sb))
				add->perm = AuBrPerm_RR;
			else if (!bindex && !(sb_flags & MS_RDONLY))
				add->perm = AuBrPerm_RW;
		}
		opt->type = Opt_add;
		goto out;
	}
	pr_err("lookup failed %s (%d)\n", add->pathname, err);
	err = -EINVAL;

out:
	return err;
}

static int au_opts_parse_del(struct au_opt_del *del, substring_t args[])
{
	int err;

	del->pathname = args[0].from;
	AuDbg("del path %s\n", del->pathname);

	err = vfsub_kern_path(del->pathname, lkup_dirflags, &del->h_path);
	if (unlikely(err))
		pr_err("lookup failed %s (%d)\n", del->pathname, err);

	return err;
}

#if 0 /* reserved for future use */
static int au_opts_parse_idel(struct super_block *sb, aufs_bindex_t bindex,
			      struct au_opt_del *del, substring_t args[])
{
	int err;
	struct dentry *root;

	err = -EINVAL;
	root = sb->s_root;
	aufs_read_lock(root, AuLock_FLUSH);
	if (bindex < 0 || au_sbend(sb) < bindex) {
		pr_err("out of bounds, %d\n", bindex);
		goto out;
	}

	err = 0;
	del->h_path.dentry = dget(au_h_dptr(root, bindex));
	del->h_path.mnt = mntget(au_sbr_mnt(sb, bindex));

out:
	aufs_read_unlock(root, !AuLock_IR);
	return err;
}
예제 #6
0
파일: opts.c 프로젝트: bjayesh/chandra
static int noinline_for_stack
au_opts_parse_xino_itrunc_path(struct super_block *sb,
			       struct au_opt_xino_itrunc *xino_itrunc,
			       substring_t args[])
{
	int err;
	aufs_bindex_t bend, bindex;
	struct path path;
	struct dentry *root;

	err = vfsub_kern_path(args[0].from, lkup_dirflags, &path);
	if (unlikely(err)) {
		pr_err("lookup failed %s (%d)\n", args[0].from, err);
		goto out;
	}

	xino_itrunc->bindex = -1;
	root = sb->s_root;
	aufs_read_lock(root, AuLock_FLUSH);
	bend = au_sbend(sb);
	for (bindex = 0; bindex <= bend; bindex++) {
		if (au_h_dptr(root, bindex) == path.dentry) {
			xino_itrunc->bindex = bindex;
			break;
		}
	}
	aufs_read_unlock(root, !AuLock_IR);
	path_put(&path);

	if (unlikely(xino_itrunc->bindex < 0)) {
		pr_err("no such branch %s\n", args[0].from);
		err = -EINVAL;
	}

out:
	return err;
}
예제 #7
0
파일: opts.c 프로젝트: bjayesh/chandra
	/* reduce stack space */
	union {
		struct au_opt_add *add;
		struct au_opt_del *del;
		struct au_opt_mod *mod;
		struct au_opt_xino *xino;
		struct au_opt_xino_itrunc *xino_itrunc;
		struct au_opt_wbr_create *create;
	} u;
	struct au_opt *opt;

	opt = opts->opt;
	while (opt->type != Opt_tail) {
		switch (opt->type) {
		case Opt_add:
			u.add = &opt->add;
			AuDbg("add {b%d, %s, 0x%x, %p}\n",
				  u.add->bindex, u.add->pathname, u.add->perm,
				  u.add->path.dentry);
			break;
		case Opt_del:
		case Opt_idel:
			u.del = &opt->del;
			AuDbg("del {%s, %p}\n",
			      u.del->pathname, u.del->h_path.dentry);
			break;
		case Opt_mod:
		case Opt_imod:
			u.mod = &opt->mod;
			AuDbg("mod {%s, 0x%x, %p}\n",
				  u.mod->path, u.mod->perm, u.mod->h_root);
			break;
		case Opt_append:
			u.add = &opt->add;
			AuDbg("append {b%d, %s, 0x%x, %p}\n",
				  u.add->bindex, u.add->pathname, u.add->perm,
				  u.add->path.dentry);
			break;
		case Opt_prepend:
			u.add = &opt->add;
			AuDbg("prepend {b%d, %s, 0x%x, %p}\n",
				  u.add->bindex, u.add->pathname, u.add->perm,
				  u.add->path.dentry);
			break;
		case Opt_dirwh:
			AuDbg("dirwh %d\n", opt->dirwh);
			break;
		case Opt_rdcache:
			AuDbg("rdcache %d\n", opt->rdcache);
			break;
		case Opt_rdblk:
			AuDbg("rdblk %u\n", opt->rdblk);
			break;
		case Opt_rdblk_def:
			AuDbg("rdblk_def\n");
			break;
		case Opt_rdhash:
			AuDbg("rdhash %u\n", opt->rdhash);
			break;
		case Opt_rdhash_def:
			AuDbg("rdhash_def\n");
			break;
		case Opt_xino:
			u.xino = &opt->xino;
			AuDbg("xino {%s %.*s}\n",
				  u.xino->path,
				  AuDLNPair(u.xino->file->f_dentry));
			break;
		case Opt_trunc_xino:
			AuLabel(trunc_xino);
			break;
		case Opt_notrunc_xino:
			AuLabel(notrunc_xino);
			break;
		case Opt_trunc_xino_path:
		case Opt_itrunc_xino:
			u.xino_itrunc = &opt->xino_itrunc;
			AuDbg("trunc_xino %d\n", u.xino_itrunc->bindex);
			break;

		case Opt_noxino:
			AuLabel(noxino);
			break;
		case Opt_trunc_xib:
			AuLabel(trunc_xib);
			break;
		case Opt_notrunc_xib:
			AuLabel(notrunc_xib);
			break;
		case Opt_shwh:
			AuLabel(shwh);
			break;
		case Opt_noshwh:
			AuLabel(noshwh);
			break;
		case Opt_plink:
			AuLabel(plink);
			break;
		case Opt_noplink:
			AuLabel(noplink);
			break;
		case Opt_list_plink:
			AuLabel(list_plink);
			break;
		case Opt_udba:
			AuDbg("udba %d, %s\n",
				  opt->udba, au_optstr_udba(opt->udba));
			break;
		case Opt_dio:
			AuLabel(dio);
			break;
		case Opt_nodio:
			AuLabel(nodio);
			break;
		case Opt_diropq_a:
			AuLabel(diropq_a);
			break;
		case Opt_diropq_w:
			AuLabel(diropq_w);
			break;
		case Opt_warn_perm:
			AuLabel(warn_perm);
			break;
		case Opt_nowarn_perm:
			AuLabel(nowarn_perm);
			break;
		case Opt_refrof:
			AuLabel(refrof);
			break;
		case Opt_norefrof:
			AuLabel(norefrof);
			break;
		case Opt_verbose:
			AuLabel(verbose);
			break;
		case Opt_noverbose:
			AuLabel(noverbose);
			break;
		case Opt_sum:
			AuLabel(sum);
			break;
		case Opt_nosum:
			AuLabel(nosum);
			break;
		case Opt_wsum:
			AuLabel(wsum);
			break;
		case Opt_wbr_create:
			u.create = &opt->wbr_create;
			AuDbg("create %d, %s\n", u.create->wbr_create,
				  au_optstr_wbr_create(u.create->wbr_create));
			switch (u.create->wbr_create) {
			case AuWbrCreate_MFSV:
			case AuWbrCreate_PMFSV:
				AuDbg("%d sec\n", u.create->mfs_second);
				break;
			case AuWbrCreate_MFSRR:
				AuDbg("%llu watermark\n",
					  u.create->mfsrr_watermark);
				break;
			case AuWbrCreate_MFSRRV:
				AuDbg("%llu watermark, %d sec\n",
					  u.create->mfsrr_watermark,
					  u.create->mfs_second);
				break;
			}
			break;
		case Opt_wbr_copyup:
			AuDbg("copyup %d, %s\n", opt->wbr_copyup,
				  au_optstr_wbr_copyup(opt->wbr_copyup));
			break;
		default:
			BUG();
		}
		opt++;
	}
#endif
}

void au_opts_free(struct au_opts *opts)
{
	struct au_opt *opt;

	opt = opts->opt;
	while (opt->type != Opt_tail) {
		switch (opt->type) {
		case Opt_add:
		case Opt_append:
		case Opt_prepend:
			path_put(&opt->add.path);
			break;
		case Opt_del:
		case Opt_idel:
			path_put(&opt->del.h_path);
			break;
		case Opt_mod:
		case Opt_imod:
			dput(opt->mod.h_root);
			break;
		case Opt_xino:
			fput(opt->xino.file);
			break;
		}
		opt++;
	}
}

static int opt_add(struct au_opt *opt, char *opt_str, unsigned long sb_flags,
		   aufs_bindex_t bindex)
{
	int err;
	struct au_opt_add *add = &opt->add;
	char *p;

	add->bindex = bindex;
	add->perm = AuBrPerm_RO;
	add->pathname = opt_str;
	p = strchr(opt_str, '=');
	if (p) {
		*p++ = 0;
		if (*p)
			add->perm = br_perm_val(p);
	}

	err = vfsub_kern_path(add->pathname, lkup_dirflags, &add->path);
	if (!err) {
		if (!p) {
			add->perm = AuBrPerm_RO;
			if (au_test_fs_rr(add->path.dentry->d_sb))
				add->perm = AuBrPerm_RR;
			else if (!bindex && !(sb_flags & MS_RDONLY))
				add->perm = AuBrPerm_RW;
		}
		opt->type = Opt_add;
		goto out;
	}
	pr_err("lookup failed %s (%d)\n", add->pathname, err);
	err = -EINVAL;

out:
	return err;
}

static int au_opts_parse_del(struct au_opt_del *del, substring_t args[])
{
	int err;

	del->pathname = args[0].from;
	AuDbg("del path %s\n", del->pathname);

	err = vfsub_kern_path(del->pathname, lkup_dirflags, &del->h_path);
	if (unlikely(err))
		pr_err("lookup failed %s (%d)\n", del->pathname, err);

	return err;
}

#if 0 /* reserved for future use */
static int au_opts_parse_idel(struct super_block *sb, aufs_bindex_t bindex,
			      struct au_opt_del *del, substring_t args[])
{
	int err;
	struct dentry *root;

	err = -EINVAL;
	root = sb->s_root;
	aufs_read_lock(root, AuLock_FLUSH);
	if (bindex < 0 || au_sbend(sb) < bindex) {
		pr_err("out of bounds, %d\n", bindex);
		goto out;
	}

	err = 0;
	del->h_path.dentry = dget(au_h_dptr(root, bindex));
	del->h_path.mnt = mntget(au_sbr_mnt(sb, bindex));

out:
	aufs_read_unlock(root, !AuLock_IR);
	return err;
}
#endif

static int noinline_for_stack
au_opts_parse_mod(struct au_opt_mod *mod, substring_t args[])
{
	int err;
	struct path path;
	char *p;

	err = -EINVAL;
	mod->path = args[0].from;
	p = strchr(mod->path, '=');
	if (unlikely(!p)) {
		pr_err("no permssion %s\n", args[0].from);
		goto out;
	}

	*p++ = 0;
	err = vfsub_kern_path(mod->path, lkup_dirflags, &path);
	if (unlikely(err)) {
		pr_err("lookup failed %s (%d)\n", mod->path, err);
		goto out;
	}

	mod->perm = br_perm_val(p);
	AuDbg("mod path %s, perm 0x%x, %s\n", mod->path, mod->perm, p);
	mod->h_root = dget(path.dentry);
	path_put(&path);

out:
	return err;
}

#if 0 /* reserved for future use */
static int au_opts_parse_imod(struct super_block *sb, aufs_bindex_t bindex,
			      struct au_opt_mod *mod, substring_t args[])
{
	int err;
	struct dentry *root;

	err = -EINVAL;
	root = sb->s_root;
	aufs_read_lock(root, AuLock_FLUSH);
	if (bindex < 0 || au_sbend(sb) < bindex) {
		pr_err("out of bounds, %d\n", bindex);
		goto out;
	}

	err = 0;
	mod->perm = br_perm_val(args[1].from);
	AuDbg("mod path %s, perm 0x%x, %s\n",
	      mod->path, mod->perm, args[1].from);
	mod->h_root = dget(au_h_dptr(root, bindex));

out:
	aufs_read_unlock(root, !AuLock_IR);
	return err;
}
예제 #8
0
파일: mvdown.c 프로젝트: ammubhave/bargud
int au_mvdown(struct dentry *dentry, struct aufs_mvdown __user *uarg)
{
    int err, e;
    unsigned char dmsg;
    struct au_mvd_args *args;

    err = -EPERM;
    if (unlikely(!capable(CAP_SYS_ADMIN)))
        goto out;

    err = -ENOMEM;
    args = kmalloc(sizeof(*args), GFP_NOFS);
    if (unlikely(!args))
        goto out;

    err = copy_from_user(&args->mvdown, uarg, sizeof(args->mvdown));
    if (!err)
        err = !access_ok(VERIFY_WRITE, uarg, sizeof(*uarg));
    if (unlikely(err)) {
        err = -EFAULT;
        AuTraceErr(err);
        goto out_free;
    }
    AuDbg("flags 0x%x\n", args->mvdown.flags);
    args->mvdown.flags &= ~(AUFS_MVDOWN_ROLOWER_R | AUFS_MVDOWN_ROUPPER_R);
    args->mvdown.au_errno = 0;
    args->dentry = dentry;
    args->inode = d_inode(dentry);
    args->sb = dentry->d_sb;

    err = -ENOENT;
    dmsg = !!(args->mvdown.flags & AUFS_MVDOWN_DMSG);
    args->parent = dget_parent(dentry);
    args->dir = d_inode(args->parent);
    mutex_lock_nested(&args->dir->i_mutex, I_MUTEX_PARENT);
    dput(args->parent);
    if (unlikely(args->parent != dentry->d_parent)) {
        AU_MVD_PR(dmsg, "parent dir is moved\n");
        goto out_dir;
    }

    mutex_lock_nested(&args->inode->i_mutex, I_MUTEX_CHILD);
    err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH);
    if (unlikely(err))
        goto out_inode;

    di_write_lock_parent(args->parent);
    err = au_mvd_args(dmsg, args);
    if (unlikely(err))
        goto out_parent;

    err = au_do_mvdown(dmsg, args);
    if (unlikely(err))
        goto out_parent;

    au_cpup_attr_timesizes(args->dir);
    au_cpup_attr_timesizes(args->inode);
    au_cpup_igen(args->inode, au_h_iptr(args->inode, args->mvd_bdst));
    /* au_digen_dec(dentry); */

out_parent:
    di_write_unlock(args->parent);
    aufs_read_unlock(dentry, AuLock_DW);
out_inode:
    mutex_unlock(&args->inode->i_mutex);
out_dir:
    mutex_unlock(&args->dir->i_mutex);
out_free:
    e = copy_to_user(uarg, &args->mvdown, sizeof(args->mvdown));
    if (unlikely(e))
        err = -EFAULT;
    kfree(args);
out:
    AuTraceErr(err);
    return err;
}
예제 #9
0
/*
 * if valid returns 1, otherwise 0.
 */
static int aufs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
{
	int valid, err;
	unsigned int sigen;
	unsigned char do_udba;
	struct super_block *sb;
	struct inode *inode;

	valid = 0;
	if (unlikely(!au_di(dentry)))
		goto out;

	valid = 1;
	sb = dentry->d_sb;
	inode = dentry->d_inode;
	/*
	 * todo: very ugly
	 * i_mutex of parent dir may be held,
	 * but we should not return 'invalid' due to busy.
	 */
	err = aufs_read_lock(dentry, AuLock_FLUSH | AuLock_DW | AuLock_NOPLM);
	if (unlikely(err)) {
		valid = err;
		AuTraceErr(err);
		goto out;
	}
	if (unlikely(au_dbrange_test(dentry))) {
		err = -EINVAL;
		AuTraceErr(err);
		goto out_dgrade;
	}

	sigen = au_sigen(sb);
	if (au_digen_test(dentry, sigen)) {
		AuDebugOn(IS_ROOT(dentry));
		err = au_reval_dpath(dentry, sigen);
		if (unlikely(err)) {
			AuTraceErr(err);
			goto out_dgrade;
		}
	}
	di_downgrade_lock(dentry, AuLock_IR);

	err = -EINVAL;
	if (inode && (IS_DEADDIR(inode) || !inode->i_nlink))
		goto out_inval;

	do_udba = !au_opt_test(au_mntflags(sb), UDBA_NONE);
	if (do_udba && inode) {
		aufs_bindex_t bstart = au_ibstart(inode);
		struct inode *h_inode;

		if (bstart >= 0) {
			h_inode = au_h_iptr(inode, bstart);
			if (h_inode && au_test_higen(inode, h_inode))
				goto out_inval;
		}
	}

	err = h_d_revalidate(dentry, inode, nd, do_udba);
	if (unlikely(!err && do_udba && au_dbstart(dentry) < 0)) {
		err = -EIO;
		AuDbg("both of real entry and whiteout found, %.*s, err %d\n",
		      AuDLNPair(dentry), err);
	}
	goto out_inval;

out_dgrade:
	di_downgrade_lock(dentry, AuLock_IR);
out_inval:
	aufs_read_unlock(dentry, AuLock_IR);
	AuTraceErr(err);
	valid = !err;
out:
	if (!valid) {
		AuDbg("%.*s invalid, %d\n", AuDLNPair(dentry), valid);
		d_drop(dentry);
	}
	return valid;
}
예제 #10
0
int aufs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
	int err, rerr;
	aufs_bindex_t bindex;
	unsigned char diropq;
	struct path h_path;
	struct dentry *wh_dentry, *parent, *opq_dentry;
	struct mutex *h_mtx;
	struct super_block *sb;
	struct {
		struct au_pin pin;
		struct au_dtime dt;
	} *a; /* reduce the stack usage */
	struct au_wr_dir_args wr_dir_args = {
		.force_btgt	= -1,
		.flags		= AuWrDir_ADD_ENTRY | AuWrDir_ISDIR
	};

	IMustLock(dir);

	err = -ENOMEM;
	a = kmalloc(sizeof(*a), GFP_NOFS);
	if (unlikely(!a))
		goto out;

	err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN);
	if (unlikely(err))
		goto out_free;
	err = au_d_may_add(dentry);
	if (unlikely(err))
		goto out_unlock;

	parent = dentry->d_parent; /* dir inode is locked */
	di_write_lock_parent(parent);
	wh_dentry = lock_hdir_lkup_wh(dentry, &a->dt, /*src_dentry*/NULL,
				      &a->pin, &wr_dir_args);
	err = PTR_ERR(wh_dentry);
	if (IS_ERR(wh_dentry))
		goto out_parent;

	sb = dentry->d_sb;
	bindex = au_dbstart(dentry);
	h_path.dentry = au_h_dptr(dentry, bindex);
	h_path.mnt = au_sbr_mnt(sb, bindex);
	err = vfsub_mkdir(au_pinned_h_dir(&a->pin), &h_path, mode);
	if (unlikely(err))
		goto out_unpin;

	/* make the dir opaque */
	diropq = 0;
	h_mtx = &h_path.dentry->d_inode->i_mutex;
	if (wh_dentry
	    || au_opt_test(au_mntflags(sb), ALWAYS_DIROPQ)) {
		mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
		opq_dentry = au_diropq_create(dentry, bindex);
		mutex_unlock(h_mtx);
		err = PTR_ERR(opq_dentry);
		if (IS_ERR(opq_dentry))
			goto out_dir;
		dput(opq_dentry);
		diropq = 1;
	}

	err = epilog(dir, bindex, wh_dentry, dentry);
	if (!err) {
		inc_nlink(dir);
		goto out_unpin; /* success */
	}

	/* revert */
	if (diropq) {
		AuLabel(revert opq);
		mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
		rerr = au_diropq_remove(dentry, bindex);
		mutex_unlock(h_mtx);
		if (rerr) {
			AuIOErr("%.*s reverting diropq failed(%d, %d)\n",
				AuDLNPair(dentry), err, rerr);
			err = -EIO;
		}
	}

out_dir:
	AuLabel(revert dir);
	rerr = vfsub_rmdir(au_pinned_h_dir(&a->pin), &h_path);
	if (rerr) {
		AuIOErr("%.*s reverting dir failed(%d, %d)\n",
			AuDLNPair(dentry), err, rerr);
		err = -EIO;
	}
	au_dtime_revert(&a->dt);
out_unpin:
	au_unpin(&a->pin);
	dput(wh_dentry);
out_parent:
	di_write_unlock(parent);
out_unlock:
	if (unlikely(err)) {
		au_update_dbstart(dentry);
		d_drop(dentry);
	}
	aufs_read_unlock(dentry, AuLock_DW);
out_free:
	kfree(a);
out:
	return err;
}
예제 #11
0
파일: export.c 프로젝트: wosigh/patches
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;
}
예제 #12
0
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;
}
예제 #13
0
파일: opts.c 프로젝트: bjayesh/chandra
/* called without aufs lock */
int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts)
{
	int err, n, token;
	aufs_bindex_t bindex;
	unsigned char skipped;
	struct dentry *root;
	struct au_opt *opt, *opt_tail;
	char *opt_str;
	/* reduce the stack space */
	union {
		struct au_opt_xino_itrunc *xino_itrunc;
		struct au_opt_wbr_create *create;
	} u;
	struct {
		substring_t args[MAX_OPT_ARGS];
	} *a;

	err = -ENOMEM;
	a = kmalloc(sizeof(*a), GFP_NOFS);
	if (unlikely(!a))
		goto out;

	root = sb->s_root;
	err = 0;
	bindex = 0;
	opt = opts->opt;
	opt_tail = opt + opts->max_opt - 1;
	opt->type = Opt_tail;
	while (!err && (opt_str = strsep(&str, ",")) && *opt_str) {
		err = -EINVAL;
		skipped = 0;
		token = match_token(opt_str, options, a->args);
		switch (token) {
		case Opt_br:
			err = 0;
			while (!err && (opt_str = strsep(&a->args[0].from, ":"))
			       && *opt_str) {
				err = opt_add(opt, opt_str, opts->sb_flags,
					      bindex++);
				if (unlikely(!err && ++opt > opt_tail)) {
					err = -E2BIG;
					break;
				}
				opt->type = Opt_tail;
				skipped = 1;
			}
			break;
		case Opt_add:
			if (unlikely(match_int(&a->args[0], &n))) {
				pr_err("bad integer in %s\n", opt_str);
				break;
			}
			bindex = n;
			err = opt_add(opt, a->args[1].from, opts->sb_flags,
				      bindex);
			if (!err)
				opt->type = token;
			break;
		case Opt_append:
			err = opt_add(opt, a->args[0].from, opts->sb_flags,
				      /*dummy bindex*/1);
			if (!err)
				opt->type = token;
			break;
		case Opt_prepend:
			err = opt_add(opt, a->args[0].from, opts->sb_flags,
				      /*bindex*/0);
			if (!err)
				opt->type = token;
			break;
		case Opt_del:
			err = au_opts_parse_del(&opt->del, a->args);
			if (!err)
				opt->type = token;
			break;
#if 0 /* reserved for future use */
		case Opt_idel:
			del->pathname = "(indexed)";
			if (unlikely(match_int(&args[0], &n))) {
				pr_err("bad integer in %s\n", opt_str);
				break;
			}
			err = au_opts_parse_idel(sb, n, &opt->del, a->args);
			if (!err)
				opt->type = token;
			break;
#endif
		case Opt_mod:
			err = au_opts_parse_mod(&opt->mod, a->args);
			if (!err)
				opt->type = token;
			break;
#ifdef IMOD /* reserved for future use */
		case Opt_imod:
			u.mod->path = "(indexed)";
			if (unlikely(match_int(&a->args[0], &n))) {
				pr_err("bad integer in %s\n", opt_str);
				break;
			}
			err = au_opts_parse_imod(sb, n, &opt->mod, a->args);
			if (!err)
				opt->type = token;
			break;
#endif
		case Opt_xino:
			err = au_opts_parse_xino(sb, &opt->xino, a->args);
			if (!err)
				opt->type = token;
			break;

		case Opt_trunc_xino_path:
			err = au_opts_parse_xino_itrunc_path
				(sb, &opt->xino_itrunc, a->args);
			if (!err)
				opt->type = token;
			break;

		case Opt_itrunc_xino:
			u.xino_itrunc = &opt->xino_itrunc;
			if (unlikely(match_int(&a->args[0], &n))) {
				pr_err("bad integer in %s\n", opt_str);
				break;
			}
			u.xino_itrunc->bindex = n;
			aufs_read_lock(root, AuLock_FLUSH);
			if (n < 0 || au_sbend(sb) < n) {
				pr_err("out of bounds, %d\n", n);
				aufs_read_unlock(root, !AuLock_IR);
				break;
			}
			aufs_read_unlock(root, !AuLock_IR);
			err = 0;
			opt->type = token;
			break;

		case Opt_dirwh:
			if (unlikely(match_int(&a->args[0], &opt->dirwh)))
				break;
			err = 0;
			opt->type = token;
			break;

		case Opt_rdcache:
			if (unlikely(match_int(&a->args[0], &n))) {
				pr_err("bad integer in %s\n", opt_str);
				break;
			}
			if (unlikely(n > AUFS_RDCACHE_MAX)) {
				pr_err("rdcache must be smaller than %d\n",
				       AUFS_RDCACHE_MAX);
				break;
			}
			opt->rdcache = n;
			err = 0;
			opt->type = token;
			break;
		case Opt_rdblk:
			if (unlikely(match_int(&a->args[0], &n)
				     || n < 0
				     || n > KMALLOC_MAX_SIZE)) {
				pr_err("bad integer in %s\n", opt_str);
				break;
			}
			if (unlikely(n && n < NAME_MAX)) {
				pr_err("rdblk must be larger than %d\n",
				       NAME_MAX);
				break;
			}
			opt->rdblk = n;
			err = 0;
			opt->type = token;
			break;
		case Opt_rdhash:
			if (unlikely(match_int(&a->args[0], &n)
				     || n < 0
				     || n * sizeof(struct hlist_head)
				     > KMALLOC_MAX_SIZE)) {
				pr_err("bad integer in %s\n", opt_str);
				break;
			}
			opt->rdhash = n;
			err = 0;
			opt->type = token;
			break;

		case Opt_trunc_xino:
		case Opt_notrunc_xino:
		case Opt_noxino:
		case Opt_trunc_xib:
		case Opt_notrunc_xib:
		case Opt_shwh:
		case Opt_noshwh:
		case Opt_plink:
		case Opt_noplink:
		case Opt_list_plink:
		case Opt_dio:
		case Opt_nodio:
		case Opt_diropq_a:
		case Opt_diropq_w:
		case Opt_warn_perm:
		case Opt_nowarn_perm:
		case Opt_refrof:
		case Opt_norefrof:
		case Opt_verbose:
		case Opt_noverbose:
		case Opt_sum:
		case Opt_nosum:
		case Opt_wsum:
		case Opt_rdblk_def:
		case Opt_rdhash_def:
			err = 0;
			opt->type = token;
			break;

		case Opt_udba:
			opt->udba = udba_val(a->args[0].from);
			if (opt->udba >= 0) {
				err = 0;
				opt->type = token;
			} else
				pr_err("wrong value, %s\n", opt_str);
			break;

		case Opt_wbr_create:
			u.create = &opt->wbr_create;
			u.create->wbr_create
				= au_wbr_create_val(a->args[0].from, u.create);
			if (u.create->wbr_create >= 0) {
				err = 0;
				opt->type = token;
			} else
				pr_err("wrong value, %s\n", opt_str);
			break;
		case Opt_wbr_copyup:
			opt->wbr_copyup = au_wbr_copyup_val(a->args[0].from);
			if (opt->wbr_copyup >= 0) {
				err = 0;
				opt->type = token;
			} else
				pr_err("wrong value, %s\n", opt_str);
			break;

		case Opt_ignore:
			pr_warn("ignored %s\n", opt_str);
			/*FALLTHROUGH*/
		case Opt_ignore_silent:
			skipped = 1;
			err = 0;
			break;
		case Opt_err:
			pr_err("unknown option %s\n", opt_str);
			break;
		}

		if (!err && !skipped) {
			if (unlikely(++opt > opt_tail)) {
				err = -E2BIG;
				opt--;
				opt->type = Opt_tail;
				break;
			}
			opt->type = Opt_tail;
		}
	}

	kfree(a);
	dump_opts(opts);
	if (unlikely(err))
		au_opts_free(opts);

out:
	return err;
}
예제 #14
0
static struct dentry *
aufs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len,
		  int fh_type)
{
	struct dentry *dentry;
	__u32 *fh = fid->raw;
	ino_t ino, dir_ino;
	aufs_bindex_t bindex;
	struct au_nfsd_si_lock nsi_lock = {
		.force_lock	= 0
	};

	dentry = ERR_PTR(-ESTALE);
	/* it should never happen, but the file handle is unreliable */
	if (unlikely(fh_len < Fh_tail))
		goto out;
	nsi_lock.sigen = fh[Fh_sigen];
	nsi_lock.br_id = fh[Fh_br_id];

	/* 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);
	/* it should never happen */
	if (unlikely(ino == AUFS_ROOT_INO))
		goto out;

	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))
		/* todo?: make it ESTALE */
		goto out_unlock;

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

	dput(dentry);
	dentry = ERR_PTR(-ESTALE);
 out_unlock:
	si_read_unlock(sb);
 out:
	AuTraceErrPtr(dentry);
	return dentry;
}

#if 0 /* reserved for future use */
/* support subtreecheck option */
static struct dentry *aufs_fh_to_parent(struct super_block *sb, struct fid *fid,
					int fh_len, int fh_type)
{
	struct dentry *parent;
	__u32 *fh = fid->raw;
	ino_t dir_ino;

	dir_ino = decode_ino(fh + Fh_dir_ino);
	parent = decode_by_ino(sb, dir_ino, 0);
	if (IS_ERR(parent))
		goto out;
	if (!parent)
		parent = decode_by_path(sb, au_br_index(sb, fh[Fh_br_id]),
					dir_ino, fh, fh_len);

 out:
	AuTraceErrPtr(parent);
	return parent;
}
#endif

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

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;

	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 = 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
	if (unlikely(!au_opt_test(au_mntflags(sb), XINO)))
		AuWarn1("NFS-exporting requires xino\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;

	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;

	*max_len -= Fh_tail;
	fh[Fh_h_type] = exportfs_encode_fh(h_parent, (void *)(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:
	if (unlikely(err < 0))
		err = 255;
	return err;
}
예제 #15
0
/*
 * when an error happened, remove the created whiteout and revert everything.
 */
static int do_revert(int err, struct inode *dir, aufs_bindex_t bindex,
		     aufs_bindex_t bwh, struct dentry *wh_dentry,
		     struct dentry *dentry, struct au_dtime *dt)
{
	int rerr;
	struct path h_path = {
		.dentry	= wh_dentry,
		.mnt	= au_sbr_mnt(dir->i_sb, bindex)
	};

	rerr = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path, dentry);
	if (!rerr) {
		au_set_dbwh(dentry, bwh);
		au_dtime_revert(dt);
		return 0;
	}

	AuIOErr("%pd reverting whiteout failed(%d, %d)\n", dentry, err, rerr);
	return -EIO;
}

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

int aufs_unlink(struct inode *dir, struct dentry *dentry)
{
	int err;
	aufs_bindex_t bwh, bindex, bstart;
	struct inode *inode, *h_dir, *delegated;
	struct dentry *parent, *wh_dentry;
	/* to reuduce stack size */
	struct {
		struct au_dtime dt;
		struct au_pin pin;
		struct path h_path;
	} *a;

	IMustLock(dir);

	err = -ENOMEM;
	a = kmalloc(sizeof(*a), GFP_NOFS);
	if (unlikely(!a))
		goto out;

	err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN);
	if (unlikely(err))
		goto out_free;
	err = au_d_hashed_positive(dentry);
	if (unlikely(err))
		goto out_unlock;
	inode = d_inode(dentry);
	IMustLock(inode);
	err = -EISDIR;
	if (unlikely(d_is_dir(dentry)))
		goto out_unlock; /* possible? */

	bstart = au_dbstart(dentry);
	bwh = au_dbwh(dentry);
	bindex = -1;
	parent = dentry->d_parent; /* dir inode is locked */
	di_write_lock_parent(parent);
	wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/0, &bindex, &a->dt,
					&a->pin);
	err = PTR_ERR(wh_dentry);
	if (IS_ERR(wh_dentry))
		goto out_parent;

	a->h_path.mnt = au_sbr_mnt(dentry->d_sb, bstart);
	a->h_path.dentry = au_h_dptr(dentry, bstart);
	dget(a->h_path.dentry);
	if (bindex == bstart) {
		h_dir = au_pinned_h_dir(&a->pin);
		delegated = NULL;
		err = vfsub_unlink(h_dir, &a->h_path, &delegated, /*force*/0);
		if (unlikely(err == -EWOULDBLOCK)) {
			pr_warn("cannot retry for NFSv4 delegation"
				" for an internal unlink\n");
			iput(delegated);
		}
	} else {
		/* dir inode is locked */
		h_dir = d_inode(wh_dentry->d_parent);
		IMustLock(h_dir);
		err = 0;
	}

	if (!err) {
		vfsub_drop_nlink(inode);
		epilog(dir, dentry, bindex);

		/* update target timestamps */
		if (bindex == bstart) {
			vfsub_update_h_iattr(&a->h_path, /*did*/NULL);
			/*ignore*/
			inode->i_ctime = d_inode(a->h_path.dentry)->i_ctime;
		} else
			/* todo: this timestamp may be reverted later */
			inode->i_ctime = h_dir->i_ctime;
		goto out_unpin; /* success */
	}

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

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

out_unpin:
	au_unpin(&a->pin);
	dput(wh_dentry);
	dput(a->h_path.dentry);
out_parent:
	di_write_unlock(parent);
out_unlock:
	aufs_read_unlock(dentry, AuLock_DW);
out_free:
	kfree(a);
out:
	return err;
}
예제 #16
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;
}
예제 #17
0
int aufs_unlink(struct inode *dir, struct dentry *dentry)
{
	int err, dlgt;
	struct inode *inode, *hidden_dir;
	struct dentry *parent, *wh_dentry, *hidden_dentry, *hidden_parent;
	struct dtime dt;
	aufs_bindex_t bwh, bindex, bstart;

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

	aufs_read_lock(dentry, AUFS_D_WLOCK);
	parent = dentry->d_parent;
	di_write_lock_parent(parent);

	bstart = dbstart(dentry);
	bwh = dbwh(dentry);
	bindex = -1;
	wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/0, &bindex, &dt);
	//wh_dentry = ERR_PTR(-1);
	err = PTR_ERR(wh_dentry);
	if (IS_ERR(wh_dentry))
		goto out;

	dlgt = need_dlgt(dir->i_sb);
	hidden_dentry = au_h_dptr(dentry);
	dget(hidden_dentry);
	hidden_parent = hidden_dentry->d_parent;
	hidden_dir = hidden_parent->d_inode;

	if (bindex == bstart) {
		err = vfsub_unlink(hidden_dir, hidden_dentry, dlgt);
		//err = -1;
	} 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) {
		inode->i_nlink--;
		epilog(dir, dentry, bindex);
		goto out_unlock; /* success */
	}

	/* revert */
	if (wh_dentry) {
		int rerr;
		rerr = do_revert(err, wh_dentry, dentry, bwh, &dt, dlgt);
		if (rerr)
			err = rerr;
	}

 out_unlock:
	hdir_unlock(hidden_dir, dir, bindex);
	dput(wh_dentry);
	dput(hidden_dentry);
 out:
	di_write_unlock(parent);
	aufs_read_unlock(dentry, AUFS_D_WLOCK);
	TraceErr(err);
	return err;
}
예제 #18
0
/*
 * when an error happened, remove the created whiteout and revert everything.
 */
static int do_revert(int err, struct inode *dir, aufs_bindex_t bindex,
		     aufs_bindex_t bwh, struct dentry *wh_dentry,
		     struct dentry *dentry, struct au_dtime *dt)
{
	int rerr;
	struct path h_path = {
		.dentry	= wh_dentry,
		.mnt	= au_sbr_mnt(dir->i_sb, bindex)
	};

	rerr = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path, dentry);
	if (!rerr) {
		au_set_dbwh(dentry, bwh);
		au_dtime_revert(dt);
		return 0;
	}

	AuIOErr("%.*s reverting whiteout failed(%d, %d)\n",
		AuDLNPair(dentry), err, rerr);
	return -EIO;
}

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

int aufs_unlink(struct inode *dir, struct dentry *dentry)
{
	int err;
	aufs_bindex_t bwh, bindex, bstart;
	struct au_dtime dt;
	struct au_pin pin;
	struct path h_path;
	struct inode *inode, *h_dir;
	struct dentry *parent, *wh_dentry;

	IMustLock(dir);

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

	bstart = au_dbstart(dentry);
	bwh = au_dbwh(dentry);
	bindex = -1;
	parent = dentry->d_parent; /* dir inode is locked */
	di_write_lock_parent(parent);
	wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/0, &bindex, &dt, &pin);
	err = PTR_ERR(wh_dentry);
	if (IS_ERR(wh_dentry))
		goto out_parent;

	h_path.mnt = au_sbr_mnt(dentry->d_sb, bstart);
	h_path.dentry = au_h_dptr(dentry, bstart);
	dget(h_path.dentry);
	if (bindex == bstart) {
		h_dir = au_pinned_h_dir(&pin);
		err = vfsub_unlink(h_dir, &h_path, /*force*/0);
	} else {
		/* dir inode is locked */
		h_dir = wh_dentry->d_parent->d_inode;
		IMustLock(h_dir);
		err = 0;
	}

	if (!err) {
		vfsub_drop_nlink(inode);
		epilog(dir, dentry, bindex);

		/* update target timestamps */
		if (bindex == bstart) {
			vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/
			inode->i_ctime = h_path.dentry->d_inode->i_ctime;
		} else
			/* todo: this timestamp may be reverted later */
			inode->i_ctime = h_dir->i_ctime;
		goto out_unpin; /* success */
	}

	/* 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_path.dentry);
out_parent:
	di_write_unlock(parent);
out_unlock:
	aufs_read_unlock(dentry, AuLock_DW);
out:
	return err;
}
예제 #19
0
파일: dentry.c 프로젝트: ammubhave/bargud
/*
 * if valid returns 1, otherwise 0.
 */
static int aufs_d_revalidate(struct dentry *dentry, unsigned int flags)
{
	int valid, err;
	unsigned int sigen;
	unsigned char do_udba;
	struct super_block *sb;
	struct inode *inode;

	/* todo: support rcu-walk? */
	if (flags & LOOKUP_RCU)
		return -ECHILD;

	valid = 0;
	if (unlikely(!au_di(dentry)))
		goto out;

	valid = 1;
	sb = dentry->d_sb;
	/*
	 * todo: very ugly
	 * i_mutex of parent dir may be held,
	 * but we should not return 'invalid' due to busy.
	 */
	err = aufs_read_lock(dentry, AuLock_FLUSH | AuLock_DW | AuLock_NOPLM);
	if (unlikely(err)) {
		valid = err;
		AuTraceErr(err);
		goto out;
	}
	inode = NULL;
	if (d_really_is_positive(dentry))
		inode = d_inode(dentry);
	if (unlikely(inode && is_bad_inode(inode))) {
		err = -EINVAL;
		AuTraceErr(err);
		goto out_dgrade;
	}
	if (unlikely(au_dbrange_test(dentry))) {
		err = -EINVAL;
		AuTraceErr(err);
		goto out_dgrade;
	}

	sigen = au_sigen(sb);
	if (au_digen_test(dentry, sigen)) {
		AuDebugOn(IS_ROOT(dentry));
		err = au_reval_dpath(dentry, sigen);
		if (unlikely(err)) {
			AuTraceErr(err);
			goto out_dgrade;
		}
	}
	di_downgrade_lock(dentry, AuLock_IR);

	err = -EINVAL;
	if (!(flags & (LOOKUP_OPEN | LOOKUP_EMPTY))
	    && inode
	    && !(inode->i_state && I_LINKABLE)
	    && (IS_DEADDIR(inode) || !inode->i_nlink))
		goto out_inval;

	do_udba = !au_opt_test(au_mntflags(sb), UDBA_NONE);
	if (do_udba && inode) {
		aufs_bindex_t bstart = au_ibstart(inode);
		struct inode *h_inode;

		if (bstart >= 0) {
			h_inode = au_h_iptr(inode, bstart);
			if (h_inode && au_test_higen(inode, h_inode))
				goto out_inval;
		}
	}

	err = h_d_revalidate(dentry, inode, flags, do_udba);
	if (unlikely(!err && do_udba && au_dbstart(dentry) < 0)) {
		err = -EIO;
		AuDbg("both of real entry and whiteout found, %p, err %d\n",
		      dentry, err);
	}
	goto out_inval;

out_dgrade:
	di_downgrade_lock(dentry, AuLock_IR);
out_inval:
	aufs_read_unlock(dentry, AuLock_IR);
	AuTraceErr(err);
	valid = !err;
out:
	if (!valid) {
		AuDbg("%pd invalid, %d\n", dentry, valid);
		d_drop(dentry);
	}
	return valid;
}
예제 #20
0
static int au_wbr_fd(struct path *path, struct aufs_wbr_fd __user *arg)
{
	int err, fd;
	aufs_bindex_t wbi, bindex, bend;
	struct file *h_file;
	struct super_block *sb;
	struct dentry *root;
	struct au_branch *br;
	struct aufs_wbr_fd wbrfd = {
		.oflags	= au_dir_roflags,
		.brid	= -1
	};
	const int valid = O_RDONLY | O_NONBLOCK | O_LARGEFILE | O_DIRECTORY
		| O_NOATIME | O_CLOEXEC;

	AuDebugOn(wbrfd.oflags & ~valid);

	if (arg) {
		err = copy_from_user(&wbrfd, arg, sizeof(wbrfd));
		if (unlikely(err)) {
			err = -EFAULT;
			goto out;
		}

		err = -EINVAL;
		AuDbg("wbrfd{0%o, %d}\n", wbrfd.oflags, wbrfd.brid);
		wbrfd.oflags |= au_dir_roflags;
		AuDbg("0%o\n", wbrfd.oflags);
		if (unlikely(wbrfd.oflags & ~valid))
			goto out;
	}

	fd = get_unused_fd_flags(0);
	err = fd;
	if (unlikely(fd < 0))
		goto out;

	h_file = ERR_PTR(-EINVAL);
	wbi = 0;
	br = NULL;
	sb = path->dentry->d_sb;
	root = sb->s_root;
	aufs_read_lock(root, AuLock_IR);
	bend = au_sbend(sb);
	if (wbrfd.brid >= 0) {
		wbi = au_br_index(sb, wbrfd.brid);
		if (unlikely(wbi < 0 || wbi > bend))
			goto out_unlock;
	}

	h_file = ERR_PTR(-ENOENT);
	br = au_sbr(sb, wbi);
	if (!au_br_writable(br->br_perm)) {
		if (arg)
			goto out_unlock;

		bindex = wbi + 1;
		wbi = -1;
		for (; bindex <= bend; bindex++) {
			br = au_sbr(sb, bindex);
			if (au_br_writable(br->br_perm)) {
				wbi = bindex;
				br = au_sbr(sb, wbi);
				break;
			}
		}
	}
	AuDbg("wbi %d\n", wbi);
	if (wbi >= 0)
		h_file = au_h_open(root, wbi, wbrfd.oflags, NULL,
				   /*force_wr*/0);

out_unlock:
	aufs_read_unlock(root, AuLock_IR);
	err = PTR_ERR(h_file);
	if (IS_ERR(h_file))
		goto out_fd;

	atomic_dec(&br->br_count); /* cf. au_h_open() */
	fd_install(fd, h_file);
	err = fd;
	goto out; /* success */

out_fd:
	put_unused_fd(fd);
out:
	AuTraceErr(err);
	return err;
}

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

long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg)
{
	long err;
	struct dentry *dentry;

	switch (cmd) {
	case AUFS_CTL_RDU:
	case AUFS_CTL_RDU_INO:
		err = au_rdu_ioctl(file, cmd, arg);
		break;

	case AUFS_CTL_WBR_FD:
		err = au_wbr_fd(&file->f_path, (void __user *)arg);
		break;

	case AUFS_CTL_IBUSY:
		err = au_ibusy_ioctl(file, arg);
		break;

	case AUFS_CTL_BRINFO:
		err = au_brinfo_ioctl(file, arg);
		break;

	case AUFS_CTL_FHSM_FD:
		dentry = file->f_path.dentry;
		if (IS_ROOT(dentry))
			err = au_fhsm_fd(dentry->d_sb, arg);
		else
			err = -ENOTTY;
		break;

	default:
		/* do not call the lower */
		AuDbg("0x%x\n", cmd);
		err = -ENOTTY;
	}

	AuTraceErr(err);
	return err;
}
예제 #21
0
/*
 * initial procedure of adding a new entry.
 * prepare writable branch and the parent dir, lock it,
 * and 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;
	struct au_branch *br;
	int err;
	unsigned int udba;
	aufs_bindex_t bcpup;

	AuDbg("%.*s\n", AuDLNPair(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;
	udba = au_opt_udba(sb);
	err = au_pin(pin, dentry, bcpup, udba,
		     AuPin_DI_LOCKED | AuPin_MNT_WRITE);
	wh_dentry = ERR_PTR(err);
	if (unlikely(err))
		goto out;

	h_parent = au_pinned_h_parent(pin);
	if (udba != AuOpt_UDBA_NONE
	    && au_dbstart(dentry) == bcpup)
		err = au_may_add(dentry, bcpup, h_parent,
				 au_ftest_wrdir(wr_dir_args->flags, ISDIR));
	else if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
		err = -ENAMETOOLONG;
	wh_dentry = ERR_PTR(err);
	if (unlikely(err))
		goto out_unpin;

	br = au_sbr(sb, bcpup);
	if (dt) {
		struct path tmp = {
			.dentry	= h_parent,
			.mnt	= br->br_mnt
		};
		au_dtime_store(dt, au_pinned_parent(pin), &tmp);
	}

	wh_dentry = NULL;
	if (bcpup != au_dbwh(dentry))
		goto out; /* success */

	wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, br);

out_unpin:
	if (IS_ERR(wh_dentry))
		au_unpin(pin);
out:
	return wh_dentry;
}

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

enum { Mknod, Symlink, Creat };
struct simple_arg {
	int type;
	union {
		struct {
			int mode;
			struct nameidata *nd;
		} c;
		struct {
			const char *symname;
		} s;
		struct {
			int mode;
			dev_t dev;
		} m;
	} u;
};

static int add_simple(struct inode *dir, struct dentry *dentry,
		      struct simple_arg *arg)
{
	int err;
	aufs_bindex_t bstart;
	unsigned char created;
	struct au_dtime dt;
	struct au_pin pin;
	struct path h_path;
	struct dentry *wh_dentry, *parent;
	struct inode *h_dir;
	struct au_wr_dir_args wr_dir_args = {
		.force_btgt	= -1,
		.flags		= AuWrDir_ADD_ENTRY
	};

	AuDbg("%.*s\n", AuDLNPair(dentry));
	IMustLock(dir);

	parent = dentry->d_parent; /* dir inode is locked */
	err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN);
	if (unlikely(err))
		goto out;
	err = au_d_may_add(dentry);
	if (unlikely(err))
		goto out_unlock;
	di_write_lock_parent(parent);
	wh_dentry = lock_hdir_lkup_wh(dentry, &dt, /*src_dentry*/NULL, &pin,
				      &wr_dir_args);
	err = PTR_ERR(wh_dentry);
	if (IS_ERR(wh_dentry))
		goto out_parent;

	bstart = au_dbstart(dentry);
	h_path.dentry = au_h_dptr(dentry, bstart);
	h_path.mnt = au_sbr_mnt(dentry->d_sb, bstart);
	h_dir = au_pinned_h_dir(&pin);
	switch (arg->type) {
	case Creat:
		err = vfsub_create(h_dir, &h_path, arg->u.c.mode);
		break;
	case Symlink:
		err = vfsub_symlink(h_dir, &h_path, arg->u.s.symname);
		break;
	case Mknod:
		err = vfsub_mknod(h_dir, &h_path, arg->u.m.mode, arg->u.m.dev);
		break;
	default:
		BUG();
	}
	created = !err;
	if (!err)
		err = epilog(dir, bstart, wh_dentry, dentry);

	/* revert */
	if (unlikely(created && err && h_path.dentry->d_inode)) {
		int rerr;
		rerr = vfsub_unlink(h_dir, &h_path, /*force*/0);
		if (rerr) {
			AuIOErr("%.*s revert failure(%d, %d)\n",
				AuDLNPair(dentry), err, rerr);
			err = -EIO;
		}
		au_dtime_revert(&dt);
	}

	au_unpin(&pin);
	dput(wh_dentry);

out_parent:
	di_write_unlock(parent);
out_unlock:
	if (unlikely(err)) {
		au_update_dbstart(dentry);
		d_drop(dentry);
	}
	aufs_read_unlock(dentry, AuLock_DW);
out:
	return err;
}

int aufs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
{
	struct simple_arg arg = {
		.type = Mknod,
		.u.m = {
			.mode	= mode,
			.dev	= dev
		}
	};
	return add_simple(dir, dentry, &arg);
}

int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
	struct simple_arg arg = {
		.type = Symlink,
		.u.s.symname = symname
	};
	return add_simple(dir, dentry, &arg);
}

int aufs_create(struct inode *dir, struct dentry *dentry, int mode,
		struct nameidata *nd)
{
	struct simple_arg arg = {
		.type = Creat,
		.u.c = {
			.mode	= mode,
			.nd	= nd
		}
	};
	return add_simple(dir, dentry, &arg);
}

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

struct au_link_args {
	aufs_bindex_t bdst, bsrc;
	struct au_pin pin;
	struct path h_path;
	struct dentry *src_parent, *parent;
};

static int au_cpup_before_link(struct dentry *src_dentry,
			       struct au_link_args *a)
{
	int err;
	struct dentry *h_src_dentry;
	struct mutex *h_mtx;
	struct file *h_file;

	di_read_lock_parent(a->src_parent, AuLock_IR);
	err = au_test_and_cpup_dirs(src_dentry, a->bdst);
	if (unlikely(err))
		goto out;

	h_src_dentry = au_h_dptr(src_dentry, a->bsrc);
	h_mtx = &h_src_dentry->d_inode->i_mutex;
	err = au_pin(&a->pin, src_dentry, a->bdst,
		     au_opt_udba(src_dentry->d_sb),
		     AuPin_DI_LOCKED | AuPin_MNT_WRITE);
	if (unlikely(err))
		goto out;
	mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
	h_file = au_h_open_pre(src_dentry, a->bsrc);
	if (IS_ERR(h_file)) {
		err = PTR_ERR(h_file);
		h_file = NULL;
	} else
		err = au_sio_cpup_simple(src_dentry, a->bdst, a->bsrc,
					 AuCpup_DTIME /* | AuCpup_KEEPLINO */);
	mutex_unlock(h_mtx);
	au_h_open_post(src_dentry, a->bsrc, h_file);
	au_unpin(&a->pin);

out:
	di_read_unlock(a->src_parent, AuLock_IR);
	return err;
}

static int au_cpup_or_link(struct dentry *src_dentry, struct au_link_args *a)
{
	int err;
	unsigned char plink;
	struct inode *h_inode, *inode;
	struct dentry *h_src_dentry;
	struct super_block *sb;
	struct file *h_file;

	plink = 0;
	h_inode = NULL;
	sb = src_dentry->d_sb;
	inode = src_dentry->d_inode;
	if (au_ibstart(inode) <= a->bdst)
		h_inode = au_h_iptr(inode, a->bdst);
	if (!h_inode || !h_inode->i_nlink) {
		/* copyup src_dentry as the name of dentry. */
		au_set_dbstart(src_dentry, a->bdst);
		au_set_h_dptr(src_dentry, a->bdst, dget(a->h_path.dentry));
		h_inode = au_h_dptr(src_dentry, a->bsrc)->d_inode;
		mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
		h_file = au_h_open_pre(src_dentry, a->bsrc);
		if (IS_ERR(h_file)) {
			err = PTR_ERR(h_file);
			h_file = NULL;
		} else
			err = au_sio_cpup_single(src_dentry, a->bdst, a->bsrc,
						 -1, AuCpup_KEEPLINO,
						 a->parent);
		mutex_unlock(&h_inode->i_mutex);
		au_h_open_post(src_dentry, a->bsrc, h_file);
		au_set_h_dptr(src_dentry, a->bdst, NULL);
		au_set_dbstart(src_dentry, a->bsrc);
	} else {
		/* the inode of src_dentry already exists on a.bdst branch */
		h_src_dentry = d_find_alias(h_inode);
		if (!h_src_dentry && au_plink_test(inode)) {
			plink = 1;
			h_src_dentry = au_plink_lkup(inode, a->bdst);
			err = PTR_ERR(h_src_dentry);
			if (IS_ERR(h_src_dentry))
				goto out;

			if (unlikely(!h_src_dentry->d_inode)) {
				dput(h_src_dentry);
				h_src_dentry = NULL;
			}

		}
		if (h_src_dentry) {
			err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin),
					 &a->h_path);
			dput(h_src_dentry);
		} else {
			AuIOErr("no dentry found for hi%lu on b%d\n",
				h_inode->i_ino, a->bdst);
			err = -EIO;
		}
	}

	if (!err && !plink)
		au_plink_append(inode, a->bdst, a->h_path.dentry);

out:
	AuTraceErr(err);
	return err;
}