This sets the readmirror=<parm> as a btrfs.<attr> extentded attribute.
Signed-off-by: Anand Jain <anand.j...@oracle.com> --- props.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/props.c b/props.c index 3a498bd9e904..1d1a2c7f9d14 100644 --- a/props.c +++ b/props.c @@ -178,6 +178,53 @@ out: return ret; } +static int prop_readmirror(enum prop_object_type type, const char *object, + const char *name, const char *value) +{ + int fd; + int ret; + char buf[256] = {0}; + char *xattr_name; + DIR *dirstream = NULL; + + fd = open_file_or_dir3(object, &dirstream, value ? O_RDWR : O_RDONLY); + if (fd < 0) { + ret = -errno; + error("failed to open %s: %m", object); + return ret; + } + + xattr_name = alloc_xattr_name(name); + if (IS_ERR(xattr_name)) { + error("failed to alloc xattr_name %s: %m", object); + return PTR_ERR(xattr_name); + } + + ret = 0; + if (value) { + if (fsetxattr(fd, xattr_name, value, strlen(value), 0) < 0) { + ret = -errno; + error("failed to set readmirror for %s: %m", object); + } + } else { + if (fgetxattr(fd, xattr_name, buf, 256) < 0) { + if (errno != ENOATTR) { + ret = -errno; + error("failed to get readmirror for %s: %m", + object); + } + } else { + fprintf(stdout, "readmirror=%.*s\n", (int) strlen(buf), + buf); + } + } + + free(xattr_name); + close_file_or_dir(fd, dirstream); + + return ret; +} + const struct prop_handler prop_handlers[] = { {"ro", "Set/get read-only flag of subvolume.", 0, prop_object_subvol, prop_read_only}, @@ -185,5 +232,7 @@ const struct prop_handler prop_handlers[] = { prop_object_dev | prop_object_root, prop_label}, {"compression", "Set/get compression for a file or directory", 0, prop_object_inode, prop_compression}, + {"readmirror", "set/get readmirror policy for filesystem", 0, + prop_object_root, prop_readmirror}, {NULL, NULL, 0, 0, NULL} }; -- 1.8.3.1