From: Anand Jain <anand.j...@oracle.com> Signed-off-by: Anand Jain <anand.j...@oracle.com> --- btrfslabel.c | 38 ++++++++++++++++++++++++++++++++++++++ btrfslabel.h | 4 +++- ctree.h | 1 + 3 files changed, 42 insertions(+), 1 deletions(-)
diff --git a/btrfslabel.c b/btrfslabel.c index cb142b0..8c424e5 100644 --- a/btrfslabel.c +++ b/btrfslabel.c @@ -34,6 +34,8 @@ #include <linux/fs.h> #include <linux/limits.h> #include <ctype.h> +#include <attr/xattr.h> +#include <attr/attributes.h> #include "kerncompat.h" #include "ctree.h" #include "utils.h" @@ -126,3 +128,39 @@ int set_label(char *btrfs_dev, char *nLabel) change_label_unmounted(btrfs_dev, nLabel); return 0; } + +int get_subvol_label(char *subvol, char *labelp) +{ + int ret; + ret = getxattr(subvol, "user.label", labelp, BTRFS_SUBVOL_LABEL_SIZE); + if(ret < 0) { + labelp = ""; + fprintf(stderr, "ERROR: get subvol label failed, %s\n", + strerror(errno)); + return -errno; + } + labelp[ret] = '\0'; + return 0; +} + +int set_subvol_label(char *subvol, char *labelp) +{ + int e=0; + char label[BTRFS_SUBVOL_LABEL_SIZE+1]; + + if (strlen(labelp) > BTRFS_SUBVOL_LABEL_SIZE) { + fprintf(stderr, "ERROR: Subvol label is more than max length %d\n", + BTRFS_SUBVOL_LABEL_SIZE); + return -1; + } + memset(label, 0, BTRFS_SUBVOL_LABEL_SIZE+1); + strcpy(label, labelp); + if(setxattr(subvol, "user.label", label, BTRFS_SUBVOL_LABEL_SIZE, + ATTR_ROOT) == -1) { + e = errno; + fprintf(stderr, "ERROR: set subvol label failed, %s\n", + strerror(e)); + return -e; + } + return 0; +} diff --git a/btrfslabel.h b/btrfslabel.h index abf43ad..1abc483 100644 --- a/btrfslabel.h +++ b/btrfslabel.h @@ -2,4 +2,6 @@ int get_label(char *btrfs_dev); -int set_label(char *btrfs_dev, char *nLabel); \ No newline at end of file +int set_label(char *btrfs_dev, char *nLabel); +int get_subvol_label(char *subvol, char *labelp); +int set_subvol_label(char *subvol, char *labelp); diff --git a/ctree.h b/ctree.h index 293b24f..993dbcf 100644 --- a/ctree.h +++ b/ctree.h @@ -325,6 +325,7 @@ struct btrfs_header { */ #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048 #define BTRFS_LABEL_SIZE 256 +#define BTRFS_SUBVOL_LABEL_SIZE 32 /* * just in case we somehow lose the roots and are not able to mount, -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html