diff options
author | David Herrmann <dh.herrmann@googlemail.com> | 2015-11-16 15:48:21 +0100 |
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committer | David Herrmann <dh.herrmann@googlemail.com> | 2015-11-16 15:48:21 +0100 |
commit | 920a7262211254a6f728af5ed4f6cd7f9a83e9a6 (patch) | |
tree | 28e800c3c807976014bb91bccecc23c70571acc2 /src | |
parent | 44690833dfadb523c1f9b6a9e6e1dced44f374e1 (diff) | |
parent | 2904e949f23aeb17b7e21a2a0f8c43f959a07f98 (diff) |
Merge pull request #1915 from poettering/btrfs-root-subvol
tmpfiles: create subvolumes for "v", "q", and "Q" only if / is a subv…
Diffstat (limited to 'src')
-rw-r--r-- | src/basic/btrfs-util.c | 18 | ||||
-rw-r--r-- | src/basic/btrfs-util.h | 4 | ||||
-rw-r--r-- | src/tmpfiles/tmpfiles.c | 24 |
3 files changed, 40 insertions, 6 deletions
diff --git a/src/basic/btrfs-util.c b/src/basic/btrfs-util.c index 8c2d76b8aa..be40dc5702 100644 --- a/src/basic/btrfs-util.c +++ b/src/basic/btrfs-util.c @@ -105,7 +105,7 @@ int btrfs_is_filesystem(int fd) { return F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC); } -int btrfs_is_subvol(int fd) { +int btrfs_is_subvol_fd(int fd) { struct stat st; assert(fd >= 0); @@ -121,6 +121,18 @@ int btrfs_is_subvol(int fd) { return btrfs_is_filesystem(fd); } +int btrfs_is_subvol(const char *path) { + _cleanup_close_ int fd = -1; + + assert(path); + + fd = open(path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY); + if (fd < 0) + return -errno; + + return btrfs_is_subvol_fd(fd); +} + int btrfs_subvol_make(const char *path) { struct btrfs_ioctl_vol_args args = {}; _cleanup_close_ int fd = -1; @@ -1686,7 +1698,7 @@ int btrfs_subvol_snapshot_fd(int old_fd, const char *new_path, BtrfsSnapshotFlag assert(old_fd >= 0); assert(new_path); - r = btrfs_is_subvol(old_fd); + r = btrfs_is_subvol_fd(old_fd); if (r < 0) return r; if (r == 0) { @@ -1872,7 +1884,7 @@ int btrfs_subvol_auto_qgroup_fd(int fd, uint64_t subvol_id, bool insert_intermed */ if (subvol_id == 0) { - r = btrfs_is_subvol(fd); + r = btrfs_is_subvol_fd(fd); if (r < 0) return r; if (!r) diff --git a/src/basic/btrfs-util.h b/src/basic/btrfs-util.h index fc9efd72d5..8c11ce35d2 100644 --- a/src/basic/btrfs-util.h +++ b/src/basic/btrfs-util.h @@ -56,7 +56,9 @@ typedef enum BtrfsRemoveFlags { } BtrfsRemoveFlags; int btrfs_is_filesystem(int fd); -int btrfs_is_subvol(int fd); + +int btrfs_is_subvol_fd(int fd); +int btrfs_is_subvol(const char *path); int btrfs_reflink(int infd, int outfd); int btrfs_clone_range(int infd, uint64_t in_offset, int ofd, uint64_t out_offset, uint64_t sz); diff --git a/src/tmpfiles/tmpfiles.c b/src/tmpfiles/tmpfiles.c index 74b6b91593..f9a759e223 100644 --- a/src/tmpfiles/tmpfiles.c +++ b/src/tmpfiles/tmpfiles.c @@ -1226,8 +1226,28 @@ static int create_item(Item *i) { mkdir_parents_label(i->path, 0755); if (IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA)) { - RUN_WITH_UMASK((~i->mode) & 0777) - r = btrfs_subvol_make(i->path); + + if (btrfs_is_subvol(isempty(arg_root) ? "/" : arg_root) <= 0) + + /* Don't create a subvolume unless the + * root directory is one, too. We do + * this under the assumption that if + * the root directory is just a plain + * directory (i.e. very light-weight), + * we shouldn't try to split it up + * into subvolumes (i.e. more + * heavy-weight). Thus, chroot() + * environments and suchlike will get + * a full brtfs subvolume set up below + * their tree only if they + * specifically set up a btrfs + * subvolume for the root dir too. */ + + r = -ENOTTY; + else { + RUN_WITH_UMASK((~i->mode) & 0777) + r = btrfs_subvol_make(i->path); + } } else r = 0; |