[Libguestfs] [PATCH v3 02/11] New API: btrfs_subvolume_get_default

btrfs_subvolume_get_default is for getting the default subvolume of a btrfs filesystem. Signed-off-by: Hu Tao <hutao(a)cn.fujitsu.com&gt; --- daemon/btrfs.c | 39 +++++++++++++++++++++++++++++++++++++++ generator/actions.ml | 18 ++++++++++++++++++ src/MAX_PROC_NR | 2 +- 3 files changed, 58 insertions(+), 1 deletion(-) diff --git a/daemon/btrfs.c b/daemon/btrfs.c index 514ba37..bcd7a50 100644 --- a/daemon/btrfs.c +++ b/daemon/btrfs.c @@ -555,6 +555,45 @@ do_btrfs_subvolume_set_default (int64_t id, const char *fs) return 0; } +int64_t +do_btrfs_subvolume_get_default (const mountable_t *fs) +{ + const size_t MAX_ARGS = 64; + const char *argv[MAX_ARGS]; + size_t i = 0; + char *fs_buf = NULL; + CLEANUP_FREE char *err = NULL; + CLEANUP_FREE char *out = NULL; + int r; + int64_t ret = -1; + + fs_buf = mount (fs); + if (fs_buf == NULL) + goto error; + + ADD_ARG (argv, i, str_btrfs); + ADD_ARG (argv, i, "subvolume"); + ADD_ARG (argv, i, "get-default"); + ADD_ARG (argv, i, fs_buf); + ADD_ARG (argv, i, NULL); + + r = commandv (&out, &err, argv); + if (r == -1) { + reply_with_error ("%s: %s", fs_buf, err); + goto error; + } + if (sscanf (out, "ID %" SCNi64, &ret) != 1) { + reply_with_error ("%s: could not parse subvolume id: %s.", argv[0], out); + ret = -1; + goto error; + } + +error: + if (fs_buf && umount (fs_buf, fs) != 0) + return -1; + return ret; +} + int do_btrfs_filesystem_sync (const char *fs) { diff --git a/generator/actions.ml b/generator/actions.ml index 4bd0788..df1be22 100644 --- a/generator/actions.ml +++ b/generator/actions.ml @@ -12029,6 +12029,24 @@ Set readahead (in 512-byte sectors) for the device. This uses the L<blockdev(8)> command." }; + { defaults with + name = "btrfs_subvolume_get_default"; + style = RInt64 "id", [Mountable_or_Path "fs"], []; + proc_nr = Some 425; + optional = Some "btrfs"; camel_name = "BTRFSSubvolumeGetDefault"; + tests = [ + InitPartition, Always, TestResult ( + [["mkfs_btrfs"; "/dev/sda1"; ""; ""; "NOARG"; ""; "NOARG"; "NOARG"; ""; ""]; + ["btrfs_subvolume_get_default"; "/dev/sda1"]], "ret > 0"), []; + InitPartition, Always, TestResult ( + [["mkfs_btrfs"; "/dev/sda1"; ""; ""; "NOARG"; ""; "NOARG"; "NOARG"; ""; ""]; + ["mount"; "/dev/sda1"; "/"]; + ["btrfs_subvolume_get_default"; "/"]], "ret > 0"), [] + ]; + shortdesc = "get the default subvolume or snapshot of a filesystem"; + longdesc = "\ +Get the default subvolume or snapshot of a filesystem mounted at C<mountpoint>." }; + ] (* Non-API meta-commands available only in guestfish. diff --git a/src/MAX_PROC_NR b/src/MAX_PROC_NR index 9524ef4..5e4a522 100644 --- a/src/MAX_PROC_NR +++ b/src/MAX_PROC_NR @@ -1 +1 @@ -424 +425 -- 1.9.3