From 754061ce7173fd8cb66ade1a48381e2cead35522 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 24 Feb 2015 18:43:37 +0100
Subject: [PATCH] importd: enable btrfs quota in /var/lib/machines, if
 necessary

---
 src/import/importd.c    |  9 +++++++++
 src/shared/btrfs-util.c | 23 +++++++++++++++++++++++
 src/shared/btrfs-util.h |  3 +++
 3 files changed, 35 insertions(+)

diff --git a/src/import/importd.c b/src/import/importd.c
index 25d9ab2e7..f31521268 100644
--- a/src/import/importd.c
+++ b/src/import/importd.c
@@ -792,6 +792,11 @@ static int setup_machine_directory(sd_bus_error *error) {
                 return sd_bus_error_set_errnof(error, r, "Failed to determine whether /var/lib/machines is located on btrfs: %m");
         if (r > 0) {
                 (void) btrfs_subvol_make_label("/var/lib/machines");
+
+                r = btrfs_quota_enable("/var/lib/machines", true);
+                if (r < 0)
+                        log_warning_errno(r, "Failed to enable quota, ignoring: %m");
+
                 return 0;
         }
 
@@ -858,6 +863,10 @@ static int setup_machine_directory(sd_bus_error *error) {
         }
         mntdir_mounted = true;
 
+        r = btrfs_quota_enable(mntdir, true);
+        if (r < 0)
+                log_warning_errno(r, "Failed to enable quota, ignoring: %m");
+
         if (chmod(mntdir, 0700) < 0) {
                 r = sd_bus_error_set_errnof(error, errno, "Failed to fix owner: %m");
                 goto fail;
diff --git a/src/shared/btrfs-util.c b/src/shared/btrfs-util.c
index 2a70dfea4..980963b74 100644
--- a/src/shared/btrfs-util.c
+++ b/src/shared/btrfs-util.c
@@ -646,3 +646,26 @@ int btrfs_defrag(const char *p) {
 
         return btrfs_defrag_fd(fd);
 }
+
+int btrfs_quota_enable_fd(int fd, bool b) {
+        struct btrfs_ioctl_quota_ctl_args args = {
+                .cmd = b ? BTRFS_QUOTA_CTL_ENABLE : BTRFS_QUOTA_CTL_DISABLE,
+        };
+
+        assert(fd >= 0);
+
+        if (ioctl(fd, BTRFS_IOC_QUOTA_CTL, &args) < 0)
+                return -errno;
+
+        return 0;
+}
+
+int btrfs_quota_enable(const char *path, bool b) {
+        _cleanup_close_ int fd = -1;
+
+        fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
+        if (fd < 0)
+                return -errno;
+
+        return btrfs_quota_enable_fd(fd, b);
+}
diff --git a/src/shared/btrfs-util.h b/src/shared/btrfs-util.h
index 1b9c142e5..93c3f13ed 100644
--- a/src/shared/btrfs-util.h
+++ b/src/shared/btrfs-util.h
@@ -64,3 +64,6 @@ int btrfs_get_block_device(const char *path, dev_t *dev);
 
 int btrfs_defrag_fd(int fd);
 int btrfs_defrag(const char *p);
+
+int btrfs_quota_enable_fd(int fd, bool b);
+int btrfs_quota_enable(const char *path, bool b);
-- 
2.30.2