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-rw-r--r--src/home/homework-quota.c118
1 files changed, 118 insertions, 0 deletions
diff --git a/src/home/homework-quota.c b/src/home/homework-quota.c
new file mode 100644
index 0000000..508c0c0
--- /dev/null
+++ b/src/home/homework-quota.c
@@ -0,0 +1,118 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#include <sys/quota.h>
+
+#include "blockdev-util.h"
+#include "btrfs-util.h"
+#include "errno-util.h"
+#include "format-util.h"
+#include "homework-quota.h"
+#include "missing_magic.h"
+#include "quota-util.h"
+#include "stat-util.h"
+#include "user-util.h"
+
+int home_update_quota_btrfs(UserRecord *h, const char *path) {
+ int r;
+
+ assert(h);
+ assert(path);
+
+ if (h->disk_size == UINT64_MAX)
+ return 0;
+
+ /* If the user wants quota, enable it */
+ r = btrfs_quota_enable(path, true);
+ if (r == -ENOTTY)
+ return log_error_errno(r, "No btrfs quota support on subvolume %s.", path);
+ if (r < 0)
+ return log_error_errno(r, "Failed to enable btrfs quota support on %s.", path);
+
+ r = btrfs_qgroup_set_limit(path, 0, h->disk_size);
+ if (r < 0)
+ return log_error_errno(r, "Failed to set disk quota on subvolume %s: %m", path);
+
+ log_info("Set btrfs quota.");
+
+ return 0;
+}
+
+int home_update_quota_classic(UserRecord *h, const char *path) {
+ struct dqblk req;
+ dev_t devno;
+ int r;
+
+ assert(h);
+ assert(uid_is_valid(h->uid));
+ assert(path);
+
+ if (h->disk_size == UINT64_MAX)
+ return 0;
+
+ r = get_block_device(path, &devno);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine block device of %s: %m", path);
+ if (devno == 0)
+ return log_error_errno(SYNTHETIC_ERRNO(ENODEV), "File system %s not backed by a block device.", path);
+
+ r = quotactl_devnum(QCMD_FIXED(Q_GETQUOTA, USRQUOTA), devno, h->uid, &req);
+ if (r == -ESRCH)
+ zero(req);
+ else if (ERRNO_IS_NEG_NOT_SUPPORTED(r))
+ return log_error_errno(r, "No UID quota support on %s.", path);
+ else if (r < 0)
+ return log_error_errno(r, "Failed to query disk quota for UID " UID_FMT ": %m", h->uid);
+ else if (FLAGS_SET(req.dqb_valid, QIF_BLIMITS) && h->disk_size / QIF_DQBLKSIZE == req.dqb_bhardlimit) {
+ /* Shortcut things if everything is set up properly already */
+ log_info("Configured quota already matches the intended setting, not updating quota.");
+ return 0;
+ }
+
+ req.dqb_valid = QIF_BLIMITS;
+ req.dqb_bsoftlimit = req.dqb_bhardlimit = h->disk_size / QIF_DQBLKSIZE;
+
+ r = quotactl_devnum(QCMD_FIXED(Q_SETQUOTA, USRQUOTA), devno, h->uid, &req);
+ if (r == -ESRCH)
+ return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), "UID quota not available on %s.", path);
+ if (r < 0)
+ return log_error_errno(r, "Failed to set disk quota for UID " UID_FMT ": %m", h->uid);
+
+ log_info("Updated per-UID quota.");
+
+ return 0;
+}
+
+int home_update_quota_auto(UserRecord *h, const char *path) {
+ struct statfs sfs;
+ int r;
+
+ assert(h);
+
+ if (h->disk_size == UINT64_MAX)
+ return 0;
+
+ if (!path) {
+ path = user_record_image_path(h);
+ if (!path)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Home record lacks image path.");
+ }
+
+ if (statfs(path, &sfs) < 0)
+ return log_error_errno(errno, "Failed to statfs() file system: %m");
+
+ if (is_fs_type(&sfs, XFS_SB_MAGIC) ||
+ is_fs_type(&sfs, EXT4_SUPER_MAGIC))
+ return home_update_quota_classic(h, path);
+
+ if (is_fs_type(&sfs, BTRFS_SUPER_MAGIC)) {
+
+ r = btrfs_is_subvol(path);
+ if (r < 0)
+ return log_error_errno(errno, "Failed to test if %s is a subvolume: %m", path);
+ if (r == 0)
+ return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), "Directory %s is not a subvolume, cannot apply quota.", path);
+
+ return home_update_quota_btrfs(h, path);
+ }
+
+ return log_error_errno(SYNTHETIC_ERRNO(ENOTTY), "Type of directory %s not known, cannot apply quota.", path);
+}