s3: add sysquotas_4B support

this is from James Peach's darwin patch, that exists since a couple of years
already.

Autobuild-User(master): Björn Jacke <bj@sernet.de>
Autobuild-Date(master): Sun Sep  2 01:00:41 CEST 2012 on sn-devel-104

1 files changed, 222 insertions, 0 deletions

diff --git a/source3/lib/sysquotas_4B.c b/source3/lib/sysquotas_4B.c
new file mode 100644
index 0000000000..9badd3b75b
--- /dev/null
+++ b/source3/lib/sysquotas_4B.c
@@ -0,0 +1,222 @@
+/*
+ * Unix SMB/CIFS implementation.
+ * System QUOTA function wrappers for QUOTACTL_4B
+
+ * Copyright (C) 2011 James Peach.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "includes.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_QUOTA
+
+#ifndef HAVE_SYS_QUOTAS
+#undef HAVE_QUOTACTL_4B
+#endif
+
+#ifdef HAVE_QUOTACTL_4B
+/* int quotactl(const char *path, int cmd, int id, char *addr)
+ *
+ * This is used by many (all?) BSD-derived systems. This implementation has
+ * been developed and tested on Darwin, but may also work on other BSD systems.
+ */
+
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#ifdef HAVE_SYS_QUOTA_H
+#include <sys/quota.h>
+#endif
+
+/* WorkARound broken HFS access checks in hfs_quotactl. */
+#define HFS_QUOTACTL_WAR 1
+
+static void xlate_qblk_to_smb(const struct dqblk * const qblk,
+			SMB_DISK_QUOTA *dp)
+{
+	ZERO_STRUCTP(dp);
+
+	DEBUG(10, ("unix softlimit=%u hardlimit=%u curblock=%u\n",
+	    (unsigned)qblk->dqb_bsoftlimit, (unsigned)qblk->dqb_bhardlimit,
+	    (unsigned)qblk->dqb_curbytes));
+
+	DEBUGADD(10, ("unix softinodes=%u hardinodes=%u curinodes=%u\n",
+	    (unsigned)qblk->dqb_isoftlimit, (unsigned)qblk->dqb_ihardlimit,
+	    (unsigned)qblk->dqb_curinodes));
+
+	/* On Darwin, quotas are counted in bytes. We report them
+	 * in 512b blocks because various callers have assumptions
+	 * about the block size.
+	 */
+#define XLATE_TO_BLOCKS(bytes) (((bytes) + 1) / 512)
+	dp->bsize = 512;
+
+	dp->softlimit = XLATE_TO_BLOCKS(qblk->dqb_bsoftlimit);
+	dp->hardlimit = XLATE_TO_BLOCKS(qblk->dqb_bhardlimit);
+	dp->curblocks = XLATE_TO_BLOCKS(qblk->dqb_curbytes);
+#undef XLATE_TO_BLOCKS
+
+	dp->ihardlimit = qblk->dqb_ihardlimit;
+	dp->isoftlimit = qblk->dqb_isoftlimit;
+	dp->curinodes = qblk->dqb_curinodes;
+
+	dp->qflags = QUOTAS_ENABLED | QUOTAS_DENY_DISK;
+
+	DEBUG(10, ("softlimit=%u hardlimit=%u curblock=%u\n",
+	    (unsigned)dp->softlimit, (unsigned)dp->hardlimit,
+	    (unsigned)dp->curblocks));
+
+	DEBUGADD(10, ("softinodes=%u hardinodes=%u curinodes=%u\n",
+	    (unsigned)dp->isoftlimit, (unsigned)dp->ihardlimit,
+	    (unsigned)dp->curinodes));
+
+}
+
+static void xlate_smb_to_qblk(const SMB_DISK_QUOTA * const dp,
+			struct dqblk *qblk)
+{
+	ZERO_STRUCTP(qblk);
+
+	/* On Darwin, quotas are counted in bytes. */
+	qblk->dqb_bsoftlimit = dp->softlimit * dp->bsize;
+	qblk->dqb_bhardlimit = dp->hardlimit * dp->bsize;
+	qblk->dqb_ihardlimit = dp->ihardlimit;
+	qblk->dqb_isoftlimit = dp->isoftlimit;
+}
+
+static int sys_quotactl_4B(const char * path, int cmd,
+		int id, struct dqblk *qblk)
+{
+	int ret;
+
+	/* NB: We must test GRPQUOTA here, because USRQUOTA is 0. */
+	DEBUG(10, ("%s quota for %s ID %u on %s\n",
+		    (cmd & QCMD(Q_GETQUOTA, 0)) ? "getting" : "setting",
+		    (cmd & QCMD(0, GRPQUOTA)) ? "group" : "user",
+		    (unsigned)id, path));
+
+#ifdef HFS_QUOTACTL_WAR
+	become_root();
+#endif  /* HFS_QUOTACTL_WAR */
+
+	ret = quotactl(path, cmd, id, qblk);
+	if (ret == -1) {
+		/* ENOTSUP means quota support is not compiled in. EINVAL
+		 * means that quotas are not configured (commonly).
+		 */
+		if (errno != ENOTSUP && errno != EINVAL) {
+			DEBUG(0, ("failed to %s quota for %s ID %u on %s: %s\n",
+				    (cmd & QCMD(Q_GETQUOTA, 0)) ? "get" : "set",
+				    (cmd & QCMD(0, GRPQUOTA)) ? "group" : "user",
+				    (unsigned)id, path, strerror(errno)));
+		}
+
+#ifdef HFS_QUOTACTL_WAR
+		unbecome_root();
+#endif  /* HFS_QUOTACTL_WAR */
+
+
+		return -1;
+	}
+
+#ifdef HFS_QUOTACTL_WAR
+		unbecome_root();
+#endif  /* HFS_QUOTACTL_WAR */
+
+	return 0;
+}
+
+int sys_get_vfs_quota(const char *path, const char *bdev,
+	enum SMB_QUOTA_TYPE qtype, unid_t id, SMB_DISK_QUOTA *dp)
+{
+	int ret;
+	struct dqblk qblk;
+
+	ZERO_STRUCT(qblk);
+
+	switch (qtype) {
+	case SMB_USER_QUOTA_TYPE:
+		/* Get quota for provided UID. */
+		ret = sys_quotactl_4B(path, QCMD(Q_GETQUOTA, USRQUOTA),
+					id.uid, &qblk);
+		break;
+	case SMB_USER_FS_QUOTA_TYPE:
+		/* Get quota for current UID. */
+		ret = sys_quotactl_4B(path, QCMD(Q_GETQUOTA, USRQUOTA),
+					geteuid(), &qblk);
+		break;
+	case SMB_GROUP_QUOTA_TYPE:
+		/* Get quota for provided GID. */
+		ret = sys_quotactl_4B(path, QCMD(Q_GETQUOTA, GRPQUOTA),
+					id.gid, &qblk);
+		break;
+	case SMB_GROUP_FS_QUOTA_TYPE:
+		/* Get quota for current GID. */
+		ret = sys_quotactl_4B(path, QCMD(Q_GETQUOTA, GRPQUOTA),
+					getegid(), &qblk);
+		break;
+	default:
+		DEBUG(0, ("cannot get unsupported quota type: %u\n",
+			    (unsigned)qtype));
+		errno = ENOSYS;
+		return -1;
+	}
+
+	if (ret == -1) {
+		return -1;
+	}
+
+	xlate_qblk_to_smb(&qblk, dp);
+	dp->qtype = qtype;
+
+	return ret;
+}
+
+int sys_set_vfs_quota(const char *path, const char *bdev,
+	enum SMB_QUOTA_TYPE qtype, unid_t id, SMB_DISK_QUOTA *dp)
+{
+	struct dqblk qblk;
+
+	xlate_smb_to_qblk(dp, &qblk);
+
+	switch (qtype) {
+	case SMB_USER_QUOTA_TYPE:
+		/* Set quota for provided UID. */
+		return sys_quotactl_4B(path, QCMD(Q_SETQUOTA, USRQUOTA),
+					id.uid, &qblk);
+	case SMB_USER_FS_QUOTA_TYPE:
+		/* Set quota for current UID. */
+		return sys_quotactl_4B(path, QCMD(Q_SETQUOTA, USRQUOTA),
+					geteuid(), &qblk);
+	case SMB_GROUP_QUOTA_TYPE:
+		/* Set quota for provided GID. */
+		return sys_quotactl_4B(path, QCMD(Q_SETQUOTA, GRPQUOTA),
+					id.gid, &qblk);
+	case SMB_GROUP_FS_QUOTA_TYPE:
+		/* Set quota for current GID. */
+		return sys_quotactl_4B(path, QCMD(Q_SETQUOTA, GRPQUOTA),
+					getegid(), &qblk);
+	default:
+		DEBUG(0, ("cannot set unsupported quota type: %u\n",
+			    (unsigned)qtype));
+		errno = ENOSYS;
+		return -1;
+	}
+}
+
+#endif /* HAVE_QUOTACTL_4B */