New setattr command

bcachefs.c

@@ -69,6 +69,8 @@ static void usage(void)
 	     "  migrate              Migrate an existing filesystem to bcachefs, in place\n"
 	     "  migrate-superblock   Add default superblock, after bcachefs migrate\n"
 	     "\n"
+	     "Commands for operating on files in a bcachefs filesystem:\n"
+	     "  setattr              Set various per file attributes\n"
 	     "Debug:\n"
 	     "These commands work on offline, unmounted filesystems\n"
 	     "  dump                 Dump filesystem metadata to a qcow2 image\n"
@@ -198,6 +200,9 @@ int main(int argc, char *argv[])
 	if (!strcmp(cmd, "list"))
 		return cmd_list(argc, argv);
 
+	if (!strcmp(cmd, "setattr"))
+		return cmd_setattr(argc, argv);
+
 	if (!strcmp(cmd, "--help")) {
 		usage();
 		return 0;

cmd_attr.c

@@ -0,0 +1,113 @@
+#include <dirent.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/xattr.h>
+#include <unistd.h>
+
+#include "libbcachefs/bcachefs_ioctl.h"
+
+#include "cmds.h"
+#include "libbcachefs.h"
+
+static void propagate_recurse(int dirfd)
+{
+	DIR *dir = fdopendir(dirfd);
+	struct dirent *d;
+
+	while ((errno = 0), (d = readdir(dir))) {
+		if (!strcmp(d->d_name, ".") ||
+		    !strcmp(d->d_name, ".."))
+			continue;
+
+		int ret = ioctl(dirfd, BCHFS_IOC_REINHERIT_ATTRS,
+			    d->d_name);
+		if (ret < 0) {
+			fprintf(stderr, "error propagating attributes to %s: %m\n",
+				d->d_name);
+			continue;
+		}
+
+		if (!ret) /* did no work */
+			continue;
+
+		struct stat st = xfstatat(dirfd, d->d_name,
+					  AT_SYMLINK_NOFOLLOW);
+		if (!S_ISDIR(st.st_mode))
+			continue;
+
+		int fd = openat(dirfd, d->d_name, O_RDONLY);
+		if (fd < 0) {
+			fprintf(stderr, "error opening %s: %m\n", d->d_name);
+			continue;
+		}
+		propagate_recurse(fd);
+		close(fd);
+	}
+
+	if (errno)
+		die("readdir error: %m");
+}
+
+static void do_setattr(char *path, struct bch_opt_strs opts)
+{
+	unsigned i;
+
+	for (i = 0; i < bch2_opts_nr; i++) {
+		if (!opts.by_id[i])
+			continue;
+
+		char *n = mprintf("bcachefs.%s", bch2_opt_table[i].attr.name);
+
+		if (setxattr(path, n, opts.by_id[i], strlen(opts.by_id[i]), 0))
+			die("setxattr error: %m");
+
+		free(n);
+	}
+
+	struct stat st = xstat(path);
+	if (!S_ISDIR(st.st_mode))
+		return;
+
+	int dirfd = open(path, O_RDONLY);
+	if (dirfd < 0)
+		die("error opening %s: %m", path);
+
+	propagate_recurse(dirfd);
+	close(dirfd);
+}
+
+static void setattr_usage(void)
+{
+	puts("bcachefs setattr - set attributes on files in a bcachefs filessytem\n"
+	     "Usage: bcachefs setattr [OPTIONS]... <files>\n"
+	     "\n"
+	     "Options:");
+
+	bch2_opts_usage(OPT_INODE);
+	puts("  -h            Display this help and exit\n"
+	     "Report bugs to <linux-bcache@vger.kernel.org>");
+}
+
+int cmd_setattr(int argc, char *argv[])
+{
+	struct bch_opt_strs opts =
+		bch2_cmdline_opts_get(&argc, argv, OPT_INODE);
+	unsigned i;
+
+	for (i = 1; i < argc; i++)
+		if (argv[i][0] == '-') {
+			printf("invalid option %s\n", argv[i]);
+			setattr_usage();
+			exit(EXIT_FAILURE);
+		}
+
+	if (argc <= 1)
+		die("Please supply one or more files");
+
+	for (i = 1; i < argc; i++)
+		do_setattr(argv[i], opts);
+
+	return 0;
+}

cmds.h

@@ -45,4 +45,6 @@ int cmd_migrate_superblock(int argc, char *argv[]);
 
 int cmd_version(int argc, char *argv[]);
 
+int cmd_setattr(int argc, char *argv[]);
+
 #endif /* _CMDS_H */