diff options
Diffstat (limited to 'src/nspawn/nspawn.c')
| -rw-r--r-- | src/nspawn/nspawn.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c index e013417cb4..673e616911 100644 --- a/src/nspawn/nspawn.c +++ b/src/nspawn/nspawn.c @@ -2260,7 +2260,7 @@ static int dissect_image( static int mount_device(const char *what, const char *where, const char *directory, bool rw) { #ifdef HAVE_BLKID _cleanup_blkid_free_probe_ blkid_probe b = NULL; - const char *fstype, *p; + const char *fstype, *p, *options; int r; assert(what); @@ -2309,7 +2309,17 @@ static int mount_device(const char *what, const char *where, const char *directo return -EOPNOTSUPP; } - return mount_verbose(LOG_ERR, what, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), NULL); + /* If this is a loopback device then let's mount the image with discard, so that the underlying file remains + * sparse when possible. */ + if (STR_IN_SET(fstype, "btrfs", "ext4", "vfat", "xfs")) { + const char *l; + + l = path_startswith(what, "/dev"); + if (l && startswith(l, "loop")) + options = "discard"; + } + + return mount_verbose(LOG_ERR, what, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options); #else log_error("--image= is not supported, compiled without blkid support."); return -EOPNOTSUPP; @@ -2684,6 +2694,10 @@ static int inner_child( } } + r = reset_uid_gid(); + if (r < 0) + return log_error_errno(r, "Couldn't become new root: %m"); + r = mount_all(NULL, arg_userns_mode != USER_NAMESPACE_NO, true, @@ -2726,10 +2740,6 @@ static int inner_child( return r; } - r = reset_uid_gid(); - if (r < 0) - return log_error_errno(r, "Couldn't become new root: %m"); - r = setup_boot_id(NULL); if (r < 0) return r; |