.help = parent_help,
};
+static void
+link_help(void)
+{
+ dbprintf(_(
+"\n"
+" Create a directory entry in the current directory that points to the\n"
+" specified file.\n"
+"\n"
+" Options:\n"
+" -i -- Point to this specific inode number.\n"
+" -p -- Point to the inode given by this path.\n"
+" -t -- Set the file type to this value.\n"
+" name -- Create this directory entry with this name.\n"
+ ));
+}
+
+static int
+create_child(
+ struct xfs_mount *mp,
+ xfs_ino_t parent_ino,
+ const char *name,
+ unsigned int ftype,
+ xfs_ino_t child_ino)
+{
+ struct xfs_name xname = {
+ .name = (const unsigned char *)name,
+ .len = strlen(name),
+ .type = ftype,
+ };
+ struct xfs_parent_args *ppargs = NULL;
+ struct xfs_trans *tp;
+ struct xfs_inode *dp, *ip;
+ unsigned int resblks;
+ bool isdir;
+ int error;
+
+ error = -libxfs_iget(mp, NULL, parent_ino, 0, &dp);
+ if (error)
+ return error;
+
+ if (!S_ISDIR(VFS_I(dp)->i_mode)) {
+ error = -ENOTDIR;
+ goto out_dp;
+ }
+
+ error = -libxfs_iget(mp, NULL, child_ino, 0, &ip);
+ if (error)
+ goto out_dp;
+ isdir = S_ISDIR(VFS_I(ip)->i_mode);
+
+ if (xname.type == XFS_DIR3_FT_UNKNOWN)
+ xname.type = libxfs_mode_to_ftype(VFS_I(ip)->i_mode);
+
+ error = -libxfs_parent_start(mp, &ppargs);
+ if (error)
+ goto out_ip;
+
+ resblks = libxfs_link_space_res(mp, MAXNAMELEN);
+ error = -libxfs_trans_alloc(mp, &M_RES(mp)->tr_link, resblks, 0, 0,
+ &tp);
+ if (error)
+ goto out_parent;
+
+ libxfs_trans_ijoin(tp, dp, 0);
+ libxfs_trans_ijoin(tp, ip, 0);
+
+ error = -libxfs_dir_createname(tp, dp, &xname, ip->i_ino, resblks);
+ if (error)
+ goto out_trans;
+
+ /* bump dp's link to ip */
+ libxfs_bumplink(tp, ip);
+
+ /* bump ip's dotdot link to dp */
+ if (isdir)
+ libxfs_bumplink(tp, dp);
+
+ /* Replace the dotdot entry in the child directory. */
+ if (isdir) {
+ error = -libxfs_dir_replace(tp, ip, &xfs_name_dotdot,
+ dp->i_ino, resblks);
+ if (error)
+ goto out_trans;
+ }
+
+ if (ppargs) {
+ error = -libxfs_parent_addname(tp, ppargs, dp, &xname, ip);
+ if (error)
+ goto out_trans;
+ }
+
+ error = -libxfs_trans_commit(tp);
+ goto out_parent;
+
+out_trans:
+ libxfs_trans_cancel(tp);
+out_parent:
+ libxfs_parent_finish(mp, ppargs);
+out_ip:
+ libxfs_irele(ip);
+out_dp:
+ libxfs_irele(dp);
+ return error;
+}
+
+static const char *ftype_map[] = {
+ [XFS_DIR3_FT_REG_FILE] = "reg",
+ [XFS_DIR3_FT_DIR] = "dir",
+ [XFS_DIR3_FT_CHRDEV] = "cdev",
+ [XFS_DIR3_FT_BLKDEV] = "bdev",
+ [XFS_DIR3_FT_FIFO] = "fifo",
+ [XFS_DIR3_FT_SOCK] = "sock",
+ [XFS_DIR3_FT_SYMLINK] = "symlink",
+ [XFS_DIR3_FT_WHT] = "whiteout",
+};
+
+static int
+link_f(
+ int argc,
+ char **argv)
+{
+ xfs_ino_t child_ino = NULLFSINO;
+ int ftype = XFS_DIR3_FT_UNKNOWN;
+ unsigned int i;
+ int c;
+ int error = 0;
+
+ while ((c = getopt(argc, argv, "i:p:t:")) != -1) {
+ switch (c) {
+ case 'i':
+ errno = 0;
+ child_ino = strtoull(optarg, NULL, 0);
+ if (errno == ERANGE) {
+ printf("%s: unknown inode number\n", optarg);
+ exitcode = 1;
+ return 0;
+ }
+ break;
+ case 'p':
+ push_cur();
+ error = path_walk(optarg);
+ if (error) {
+ printf("%s: %s\n", optarg, strerror(error));
+ exitcode = 1;
+ return 0;
+ } else if (iocur_top->typ != &typtab[TYP_INODE]) {
+ printf("%s: does not point to an inode\n",
+ optarg);
+ exitcode = 1;
+ return 0;
+ } else {
+ child_ino = iocur_top->ino;
+ }
+ pop_cur();
+ break;
+ case 't':
+ for (i = 0; i < ARRAY_SIZE(ftype_map); i++) {
+ if (ftype_map[i] &&
+ !strcmp(ftype_map[i], optarg)) {
+ ftype = i;
+ break;
+ }
+ }
+ if (i == ARRAY_SIZE(ftype_map)) {
+ printf("%s: unknown file type\n", optarg);
+ exitcode = 1;
+ return 0;
+ }
+ break;
+ default:
+ link_help();
+ return 0;
+ }
+ }
+
+ if (child_ino == NULLFSINO) {
+ printf("link: need to specify child via -i or -p\n");
+ exitcode = 1;
+ return 0;
+ }
+
+ if (iocur_top->typ != &typtab[TYP_INODE]) {
+ printf("io cursor does not point to an inode.\n");
+ exitcode = 1;
+ return 0;
+ }
+
+ if (optind + 1 != argc) {
+ printf("link: need directory entry name");
+ exitcode = 1;
+ return 0;
+ }
+
+ error = create_child(mp, iocur_top->ino, argv[optind], ftype,
+ child_ino);
+ if (error) {
+ printf("link failed: %s\n", strerror(error));
+ exitcode = 1;
+ return 0;
+ }
+
+ return 0;
+}
+
+static struct cmdinfo link_cmd = {
+ .name = "link",
+ .cfunc = link_f,
+ .argmin = 0,
+ .argmax = -1,
+ .canpush = 0,
+ .args = "[-i ino] [-p path] [-t ftype] name",
+ .help = link_help,
+};
+
+static void
+unlink_help(void)
+{
+ dbprintf(_(
+"\n"
+" Remove a directory entry from the current directory.\n"
+"\n"
+" Options:\n"
+" name -- Remove the directory entry with this name.\n"
+ ));
+}
+
+static void
+droplink(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip)
+{
+ struct inode *inode = VFS_I(ip);
+
+ libxfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
+
+ if (inode->i_nlink != XFS_NLINK_PINNED)
+ drop_nlink(VFS_I(ip));
+
+ libxfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+}
+
+static int
+remove_child(
+ struct xfs_mount *mp,
+ xfs_ino_t parent_ino,
+ const char *name)
+{
+ struct xfs_name xname = {
+ .name = (const unsigned char *)name,
+ .len = strlen(name),
+ };
+ struct xfs_parent_args *ppargs;
+ struct xfs_trans *tp;
+ struct xfs_inode *dp, *ip;
+ xfs_ino_t child_ino;
+ unsigned int resblks;
+ int error;
+
+ error = -libxfs_iget(mp, NULL, parent_ino, 0, &dp);
+ if (error)
+ return error;
+
+ if (!S_ISDIR(VFS_I(dp)->i_mode)) {
+ error = -ENOTDIR;
+ goto out_dp;
+ }
+
+ error = -libxfs_dir_lookup(NULL, dp, &xname, &child_ino, NULL);
+ if (error)
+ goto out_dp;
+
+ error = -libxfs_iget(mp, NULL, child_ino, 0, &ip);
+ if (error)
+ goto out_dp;
+
+ error = -libxfs_parent_start(mp, &ppargs);
+ if (error)
+ goto out_ip;
+
+ resblks = libxfs_remove_space_res(mp, MAXNAMELEN);
+ error = -libxfs_trans_alloc(mp, &M_RES(mp)->tr_remove, resblks, 0, 0,
+ &tp);
+ if (error)
+ goto out_parent;
+
+ libxfs_trans_ijoin(tp, dp, 0);
+ libxfs_trans_ijoin(tp, ip, 0);
+
+ if (S_ISDIR(VFS_I(ip)->i_mode)) {
+ /* drop ip's dotdot link to dp */
+ droplink(tp, dp);
+ } else {
+ libxfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
+ }
+
+ /* drop dp's link to ip */
+ droplink(tp, ip);
+
+ error = -libxfs_dir_removename(tp, dp, &xname, ip->i_ino, resblks);
+ if (error)
+ goto out_trans;
+
+ if (ppargs) {
+ error = -libxfs_parent_removename(tp, ppargs, dp, &xname, ip);
+ if (error)
+ goto out_trans;
+ }
+
+ error = -libxfs_trans_commit(tp);
+ goto out_parent;
+
+out_trans:
+ libxfs_trans_cancel(tp);
+out_parent:
+ libxfs_parent_finish(mp, ppargs);
+out_ip:
+ libxfs_irele(ip);
+out_dp:
+ libxfs_irele(dp);
+ return error;
+}
+
+static int
+unlink_f(
+ int argc,
+ char **argv)
+{
+ int c;
+ int error = 0;
+
+ while ((c = getopt(argc, argv, "")) != -1) {
+ switch (c) {
+ default:
+ unlink_help();
+ return 0;
+ }
+ }
+
+ if (iocur_top->typ != &typtab[TYP_INODE]) {
+ printf("io cursor does not point to an inode.\n");
+ exitcode = 1;
+ return 0;
+ }
+
+ if (optind + 1 != argc) {
+ printf("unlink: need directory entry name");
+ exitcode = 1;
+ return 0;
+ }
+
+ error = remove_child(mp, iocur_top->ino, argv[optind]);
+ if (error) {
+ printf("unlink failed: %s\n", strerror(error));
+ exitcode = 1;
+ return 0;
+ }
+
+ return 0;
+}
+
+static struct cmdinfo unlink_cmd = {
+ .name = "unlink",
+ .cfunc = unlink_f,
+ .argmin = 0,
+ .argmax = -1,
+ .canpush = 0,
+ .args = "name",
+ .help = unlink_help,
+};
+
void
namei_init(void)
{
parent_cmd.oneline = _("list parent pointers");
add_command(&parent_cmd);
+
+ if (expert_mode) {
+ link_cmd.oneline = _("create directory link");
+ add_command(&link_cmd);
+
+ unlink_cmd.oneline = _("remove directory link");
+ add_command(&unlink_cmd);
+ }
}
projects / thirdparty / xfsprogs-dev.git / commitdiff
