Whamcloud - gitweb
LU-12624 lod: alloc dir stripes by QoS
[fs/lustre-release.git] / lustre / utils / lfs.c
index e7a043e..079d2a0 100644 (file)
@@ -103,6 +103,7 @@ static int lfs_changelog(int argc, char **argv);
 static int lfs_changelog_clear(int argc, char **argv);
 static int lfs_fid2path(int argc, char **argv);
 static int lfs_path2fid(int argc, char **argv);
+static int lfs_rmfid(int argc, char **argv);
 static int lfs_data_version(int argc, char **argv);
 static int lfs_hsm_state(int argc, char **argv);
 static int lfs_hsm_set(int argc, char **argv);
@@ -127,6 +128,17 @@ static inline int lfs_mirror_verify(int argc, char **argv);
 static inline int lfs_mirror_read(int argc, char **argv);
 static inline int lfs_mirror_write(int argc, char **argv);
 static inline int lfs_mirror_copy(int argc, char **argv);
+static int lfs_pcc_attach(int argc, char **argv);
+static int lfs_pcc_attach_fid(int argc, char **argv);
+static int lfs_pcc_detach(int argc, char **argv);
+static int lfs_pcc_detach_fid(int argc, char **argv);
+static int lfs_pcc_state(int argc, char **argv);
+static int lfs_pcc(int argc, char **argv);
+static int lfs_pcc_list_commands(int argc, char **argv);
+static int lfs_migrate_to_dom(int fd, int fdv, char *name,
+                             __u64 migration_flags,
+                             struct llapi_stripe_param *param,
+                             struct llapi_layout *layout);
 
 enum setstripe_origin {
        SO_SETSTRIPE,
@@ -135,6 +147,7 @@ enum setstripe_origin {
        SO_MIRROR_CREATE,
        SO_MIRROR_EXTEND,
        SO_MIRROR_SPLIT,
+       SO_MIRROR_DELETE,
 };
 static int lfs_setstripe_internal(int argc, char **argv,
                                  enum setstripe_origin opc);
@@ -159,11 +172,16 @@ static inline int lfs_mirror_split(int argc, char **argv)
 {
        return lfs_setstripe_internal(argc, argv, SO_MIRROR_SPLIT);
 }
+static inline int lfs_mirror_delete(int argc, char **argv)
+{
+       return lfs_setstripe_internal(argc, argv, SO_MIRROR_DELETE);
+}
 
 /* Setstripe and migrate share mostly the same parameters */
 #define SSM_CMD_COMMON(cmd) \
        "usage: "cmd" [--component-end|-E <comp_end>]\n"                \
        "                 [--stripe-count|-c <stripe_count>]\n"         \
+       "                 [--overstripe-count|-C <stripe_count>]\n"     \
        "                 [--stripe-index|-i <start_ost_idx>]\n"        \
        "                 [--stripe-size|-S <stripe_size>]\n"           \
        "                 [--layout|-L <pattern>]\n"                    \
@@ -174,6 +192,9 @@ static inline int lfs_mirror_split(int argc, char **argv)
 
 #define SSM_HELP_COMMON \
        "\tstripe_count: Number of OSTs to stripe over (0=fs default, -1 all)\n" \
+       "\t              Using -C instead of -c allows overstriping, which\n" \
+        "\t             will place more than one stripe per OST if\n" \
+        "\t             stripe_count is greater than the number of OSTs\n" \
        "\tstart_ost_idx: OST index of first stripe (-1=default round robin)\n"\
        "\tstripe_size:  Number of bytes on each OST (0=fs default)\n" \
        "\t              Can be specified with K, M or G (for KB, MB, GB\n" \
@@ -255,6 +276,7 @@ static inline int lfs_mirror_split(int argc, char **argv)
        "\tmdt_hash:  hash type of the striped directory. mdt types:\n" \
        "       fnv_1a_64 FNV-1a hash algorithm (default)\n"            \
        "       all_char  sum of characters % MDT_COUNT (not recommended)\n" \
+       "       space     create subdirectories with balanced space usage\n" \
        "\tdefault_stripe: set default dirstripe of the directory\n"    \
        "\tmode: the file access permission of the directory (octal)\n" \
        "To create dir with a foreign (free format) layout :\n" \
@@ -271,22 +293,27 @@ command_t mirror_cmdlist[] = {
          .pc_help = "Create a mirrored file.\n"
                "usage: lfs mirror create "
                "<--mirror-count|-N[mirror_count]> "
-               "[setstripe options] ... <filename|directory>\n"
+               "[setstripe options] ... <filename|directory> ...\n"
          MIRROR_CREATE_HELP },
+       { .pc_name = "delete", .pc_func = lfs_mirror_delete,
+         .pc_help = "delete a mirror from a file.\n"
+               "usage: lfs mirror delete {--comp-id|-I <comp_id>|-p <pool>} <mirrored_file> ...\n"
+       },
        { .pc_name = "extend", .pc_func = lfs_mirror_extend,
          .pc_help = "Extend a mirrored file.\n"
                "usage: lfs mirror extend "
                "<--mirror-count|-N[mirror_count]> [--no-verify] "
-               "[setstripe options|-f <victim_file>] ... <filename>\n"
+               "[setstripe options|-f <victim_file>] ... <filename> ...\n"
          MIRROR_EXTEND_HELP },
        { .pc_name = "split", .pc_func = lfs_mirror_split,
          .pc_help = "Split a mirrored file.\n"
-       "usage: lfs mirror split <--mirror-id <mirror_id> | \n"
-       "\t             <--component-id|-I <comp_id>> [--destroy|-d] \n"
-       "\t             [-f <new_file>] <mirrored file>\n"
+       "usage: lfs mirror split <--mirror-id <mirror_id> |\n"
+       "\t             <--component-id|-I <comp_id>|-p <pool>> [--destroy|-d]\n"
+       "\t             [-f <new_file>] <mirrored_file> ...\n"
        "\tmirror_id:   The numerical unique identifier for a mirror. It\n"
        "\t             can be fetched by lfs getstripe command.\n"
        "\tcomp_id:     Unique component ID within a mirror.\n"
+       "\tpool:        Components on specified pool.\n"
        "\tnew_file:    This option indicates the layout of the split\n"
        "\t             mirror will be stored into. If not specified,\n"
        "\t             a new file named <mirrored_file>.mirror~<mirror_id>\n"
@@ -320,6 +347,37 @@ command_t mirror_cmdlist[] = {
        { .pc_help = NULL }
 };
 
+/**
+ * command_t pcc_cmdlist - lfs pcc commands.
+ */
+command_t pcc_cmdlist[] = {
+       { .pc_name = "attach", .pc_func = lfs_pcc_attach,
+         .pc_help = "Attach given files to the Persistent Client Cache.\n"
+               "usage: lfs pcc attach <--id|-i NUM> <file> ...\n"
+               "\t-i: archive id for RW-PCC\n" },
+       { .pc_name = "attach_fid", .pc_func = lfs_pcc_attach_fid,
+         .pc_help = "Attach given files into PCC by FID(s).\n"
+               "usage: lfs pcc attach_id <--id|-i NUM> <--mnt|-m mnt> "
+               "<fid> ...\n"
+               "\t-i: archive id for RW-PCC\n"
+               "\t-m: Lustre mount point\n" },
+       { .pc_name = "state", .pc_func = lfs_pcc_state,
+         .pc_help = "Display the PCC state for given files.\n"
+               "usage: lfs pcc state <file> ...\n" },
+       { .pc_name = "detach", .pc_func = lfs_pcc_detach,
+         .pc_help = "Detach given files from the Persistent Client Cache.\n"
+               "usage: lfs pcc detach <file> ...\n" },
+       { .pc_name = "detach_fid", .pc_func = lfs_pcc_detach_fid,
+         .pc_help = "Detach given files from PCC by FID(s).\n"
+               "usage: lfs pcc detach_fid <mntpath> <fid>...\n" },
+       { .pc_name = "list-commands", .pc_func = lfs_pcc_list_commands,
+         .pc_help = "list commands supported by lfs pcc"},
+       { .pc_name = "help", .pc_func = Parser_help, .pc_help = "help" },
+       { .pc_name = "exit", .pc_func = Parser_quit, .pc_help = "quit" },
+       { .pc_name = "quit", .pc_func = Parser_quit, .pc_help = "quit" },
+       { .pc_help = NULL }
+};
+
 /* all available commands */
 command_t cmdlist[] = {
        {"setstripe", lfs_setstripe, 0,
@@ -362,6 +420,7 @@ command_t cmdlist[] = {
         "                 [--component-id[=comp_id]|-I[comp_id]]\n"
         "                 [--component-flags[=comp_flags]]\n"
         "                 [--component-count]\n"
+        "                 [--extension-size|--ext-size|-z]\n"
         "                 [--component-start[=[+-]comp_start]]\n"
         "                 [--component-end[=[+-]comp_end]|-E[[+-]comp_end]]\n"
         "                 [[!] --mirror-index=[+-]<index> |\n"
@@ -507,11 +566,11 @@ command_t cmdlist[] = {
        {"fid2path", lfs_fid2path, 0,
         "Resolve the full path(s) for given FID(s). For a specific hardlink "
         "specify link number <linkno>.\n"
-       /* "For a historical link name, specify changelog record <recno>.\n" */
-        "usage: fid2path [--link <linkno>] <fsname|rootpath> <fid> ..."
-               /* [ --rec <recno> ] */ },
+        "usage: fid2path [-c] [--link|-l <linkno>] <fsname|root> <fid> ..."},
        {"path2fid", lfs_path2fid, 0, "Display the fid(s) for a given path(s).\n"
         "usage: path2fid [--parents] <path> ..."},
+       {"rmfid", lfs_rmfid, 0, "Remove file(s) by FID(s)\n"
+        "usage: rmfid <fsname|rootpath> <fid> ..."},
        {"data_version", lfs_data_version, 0, "Display file data version for "
         "a given path.\n" "usage: data_version -[n|r|w] <path>"},
        {"hsm_state", lfs_hsm_state, 0, "Display the HSM information (states, "
@@ -569,6 +628,7 @@ command_t cmdlist[] = {
         "layout\nto another (may be not safe with concurent writes).\n"
         "usage: migrate  "
         "[--stripe-count|-c] <stripe_count>\n"
+        "[--overstripe-count|-C] <stripe_count>\n"
         "              [--stripe-index|-i] <start_ost_index>\n"
         "              [--stripe-size|-S] <stripe_size>\n"
         "              [--pool|-p] <pool_name>\n"
@@ -578,6 +638,9 @@ command_t cmdlist[] = {
         "              [--non-direct|-D]\n"
         "              <file|directory>\n"
         "\tstripe_count:     number of OSTs to stripe a file over\n"
+        "\t              Using -C instead of -c allows overstriping, which\n"
+        "\t              will place more than one stripe per OST if\n"
+        "\t              stripe_count is greater than the number of OSTs\n"
         "\tstripe_ost_index: index of the first OST to stripe a file over\n"
         "\tstripe_size:      number of bytes to store before moving to the next OST\n"
         "\tpool_name:        name of the predefined pool of OSTs\n"
@@ -621,6 +684,13 @@ command_t cmdlist[] = {
         "\t--clear|-c: Clear file heat for given files\n"
         "\t--off|-o:   Turn off file heat for given files\n"
         "\t--on|-O:    Turn on file heat for given files\n"},
+       {"pcc", lfs_pcc, pcc_cmdlist,
+        "lfs commands used to interact with PCC features:\n"
+        "lfs pcc attach - attach given files to Persistent Client Cache\n"
+        "lfs pcc attach_fid - attach given files into PCC by FID(s)\n"
+        "lfs pcc state  - display the PCC state for given files\n"
+        "lfs pcc detach - detach given files from Persistent Client Cache\n"
+        "lfs pcc detach_fid - detach given files from PCC by FID(s)\n"},
        {"help", Parser_help, 0, "help"},
        {"exit", Parser_quit, 0, "quit"},
        {"quit", Parser_quit, 0, "quit"},
@@ -1026,16 +1096,31 @@ static int lfs_component_set(char *fname, int comp_id,
        }
 
        if (neg_flags) {
+               if (neg_flags & LCME_FL_STALE) {
+                       fprintf(stderr, "%s: cannot clear 'stale' flags from "
+                               "component. Please use lfs-mirror-resync(1) "
+                               "instead\n", progname);
+                       return -EINVAL;
+               }
+
                ids[count] = comp_id;
                flags_array[count] = neg_flags | LCME_FL_NEG;
                ++count;
        }
 
        rc = llapi_layout_file_comp_set(fname, ids, flags_array, count);
-       if (rc)
-               fprintf(stderr,
-                       "%s: cannot change the flags of component '%#x' of file '%s': %x / ^(%x)\n",
-                       progname, comp_id, fname, flags, neg_flags);
+       if (rc) {
+               if (errno == EUCLEAN) {
+                       rc = -errno;
+                       fprintf(stderr,
+                               "%s: cannot set 'stale' flag on component '%#x' of the last non-stale mirror of '%s'\n",
+                               progname, comp_id, fname);
+               } else {
+                       fprintf(stderr,
+                               "%s: cannot change the flags of component '%#x' of file '%s': %x / ^(%x)\n",
+                               progname, comp_id, fname, flags, neg_flags);
+               }
+       }
 
        return rc;
 }
@@ -1054,7 +1139,6 @@ static int lfs_component_del(char *fname, __u32 comp_id,
        if ((flags && comp_id) || (!flags && !comp_id))
                return -EINVAL;
 
-       /* LCME_FL_INIT is the only supported flag in PFL */
        if (flags) {
                if (flags & ~LCME_KNOWN_FLAGS) {
                        fprintf(stderr,
@@ -1117,6 +1201,8 @@ static int lfs_migrate(char *name, __u64 migration_flags,
                       struct llapi_stripe_param *param,
                       struct llapi_layout *layout)
 {
+       struct llapi_layout *existing;
+       uint64_t dom_new, dom_cur;
        int fd = -1;
        int fdv = -1;
        int rc;
@@ -1126,6 +1212,36 @@ static int lfs_migrate(char *name, __u64 migration_flags,
        if (rc < 0)
                goto out;
 
+       rc = llapi_layout_dom_size(layout, &dom_new);
+       if (rc) {
+               error_loc = "cannot get new layout DoM size";
+               goto out;
+       }
+       /* special case for migration to DOM layout*/
+       existing = llapi_layout_get_by_fd(fd, 0);
+       if (!existing) {
+               error_loc = "cannot get existing layout";
+               goto out;
+       }
+
+       rc = llapi_layout_dom_size(existing, &dom_cur);
+       if (rc) {
+               error_loc = "cannot get current layout DoM size";
+               goto out;
+       }
+
+       /* if file has DoM layout already then migration is possible to
+        * the new layout with the same DoM component via swap layout,
+        * if new layout used bigger DOM size, then mirroring is used
+        */
+       if (dom_new > dom_cur) {
+               rc = lfs_migrate_to_dom(fd, fdv, name, migration_flags, param,
+                                       layout);
+               if (rc)
+                       error_loc = "cannot migrate to DOM layout";
+               goto out_closed;
+       }
+
        if (!(migration_flags & MIGRATION_NONBLOCK)) {
                /* Blocking mode (forced if servers do not support file lease).
                 * It is also the default mode, since we cannot distinguish
@@ -1162,7 +1278,7 @@ out:
 
        if (fdv >= 0)
                close(fdv);
-
+out_closed:
        if (rc < 0)
                fprintf(stderr, "error: %s: %s: %s: %s\n",
                        progname, name, error_loc, strerror(-rc));
@@ -1259,69 +1375,6 @@ struct mirror_args {
        struct mirror_args      *m_next;
 };
 
-static int mirror_sanity_check_flags(struct llapi_layout *layout, void *unused)
-{
-       uint32_t flags;
-       int rc;
-
-       rc = llapi_layout_comp_flags_get(layout, &flags);
-       if (rc)
-               return -errno;
-
-       if (flags & LCME_FL_NEG) {
-               fprintf(stderr, "error: %s: negative flags are not supported\n",
-                       progname);
-               return -EINVAL;
-       }
-
-       if (flags & LCME_FL_STALE) {
-               fprintf(stderr, "error: %s: setting '%s' is not supported\n",
-                       progname, comp_flags_table[LCME_FL_STALE].cfn_name);
-               return -EINVAL;
-       }
-
-       return LLAPI_LAYOUT_ITER_CONT;
-}
-
-static inline int mirror_sanity_check_one(struct llapi_layout *layout)
-{
-       uint64_t start, end;
-       uint64_t pattern;
-       int rc;
-
-       /* LU-10112: do not support dom+flr in phase 1 */
-       rc = llapi_layout_comp_use(layout, LLAPI_LAYOUT_COMP_USE_FIRST);
-       if (rc)
-               return -errno;
-
-       rc = llapi_layout_pattern_get(layout, &pattern);
-       if (rc)
-               return -errno;
-
-       if (pattern == LOV_PATTERN_MDT || pattern == LLAPI_LAYOUT_MDT) {
-               fprintf(stderr, "error: %s: doesn't support dom+flr for now\n",
-                       progname);
-               return -ENOTSUP;
-       }
-
-       rc = llapi_layout_comp_use(layout, LLAPI_LAYOUT_COMP_USE_LAST);
-       if (rc)
-               return -errno;
-
-       rc = llapi_layout_comp_extent_get(layout, &start, &end);
-       if (rc)
-               return -errno;
-
-       if (end != LUSTRE_EOF) {
-               fprintf(stderr, "error: %s: mirror layout doesn't reach eof\n",
-                       progname);
-               return -EINVAL;
-       }
-
-       rc = llapi_layout_comp_iterate(layout, mirror_sanity_check_flags, NULL);
-       return rc;
-}
-
 /**
  * enum mirror_flags - Flags for extending a mirrored file.
  * @MF_NO_VERIFY: Indicates not to verify the mirror(s) from victim file(s)
@@ -1336,6 +1389,7 @@ enum mirror_flags {
        MF_NO_VERIFY    = 0x1,
        MF_DESTROY      = 0x2,
        MF_COMP_ID      = 0x4,
+       MF_COMP_POOL    = 0x8,
 };
 
 /**
@@ -1368,11 +1422,14 @@ static int mirror_create_sanity_check(const char *fname,
                        return -ENODATA;
                }
 
-               rc = mirror_sanity_check_one(layout);
+               rc = llapi_layout_sanity(layout, false, true);
+
                llapi_layout_free(layout);
 
-               if (rc)
+               if (rc) {
+                       llapi_layout_sanity_perror(rc);
                        return rc;
+               }
        }
 
        while (list != NULL) {
@@ -1397,9 +1454,11 @@ static int mirror_create_sanity_check(const char *fname,
                        }
                }
 
-               rc = mirror_sanity_check_one(list->m_layout);
-               if (rc)
+               rc = llapi_layout_sanity(list->m_layout, false, true);
+               if (rc) {
+                       llapi_layout_sanity_perror(rc);
                        return rc;
+               }
 
                list = list->m_next;
        }
@@ -1785,7 +1844,99 @@ static int find_comp_id(struct llapi_layout *layout, void *cbdata)
 
        return LLAPI_LAYOUT_ITER_CONT;
 }
-static int mirror_split(const char *fname, __u32 id,
+
+struct pool_to_id_cbdata {
+       const char *pool;
+       __u32 id;
+};
+static int find_comp_id_by_pool(struct llapi_layout *layout, void *cbdata)
+{
+       char buf[LOV_MAXPOOLNAME + 1];
+       struct pool_to_id_cbdata *d = (void *)cbdata;
+       uint32_t id;
+       int rc;
+
+       rc = llapi_layout_pool_name_get(layout, buf, sizeof(buf));
+       if (rc < 0)
+               return rc;
+       if (strcmp(d->pool, buf))
+               return LLAPI_LAYOUT_ITER_CONT;
+
+       rc = llapi_layout_mirror_id_get(layout, &id);
+       if (rc < 0)
+               return rc;
+       d->id = id;
+
+       return LLAPI_LAYOUT_ITER_STOP;
+}
+
+struct collect_ids_data {
+       __u16   *cid_ids;
+       int     cid_count;
+       __u16   cid_exclude;
+};
+
+static int collect_mirror_id(struct llapi_layout *layout, void *cbdata)
+{
+       struct collect_ids_data *cid = cbdata;
+       uint32_t id;
+       int rc;
+
+       rc = llapi_layout_mirror_id_get(layout, &id);
+       if (rc < 0)
+               return rc;
+
+       if ((__u16)id != cid->cid_exclude) {
+               int i;
+
+               for (i = 0; i < cid->cid_count; i++) {
+                       /* already collected the mirror id */
+                       if (id == cid->cid_ids[i])
+                               return LLAPI_LAYOUT_ITER_CONT;
+               }
+               cid->cid_ids[cid->cid_count] = id;
+               cid->cid_count++;
+       }
+
+       return LLAPI_LAYOUT_ITER_CONT;
+}
+
+/**
+ * last_non_stale_mirror() - Check if a mirror is the last non-stale mirror.
+ * @mirror_id: Mirror id to be checked.
+ * @layout:    Mirror component list.
+ *
+ * This function checks if a mirror with specified @mirror_id is the last
+ * non-stale mirror of a layout @layout.
+ *
+ * Return: true or false.
+ */
+static inline
+bool last_non_stale_mirror(__u16 mirror_id, struct llapi_layout *layout)
+{
+       __u16 mirror_ids[128] = { 0 };
+       struct collect_ids_data cid = { .cid_ids = mirror_ids,
+                                       .cid_count = 0,
+                                       .cid_exclude = mirror_id, };
+       int i;
+
+       llapi_layout_comp_iterate(layout, collect_mirror_id, &cid);
+
+       for (i = 0; i < cid.cid_count; i++) {
+               struct llapi_resync_comp comp_array[1024] = { { 0 } };
+               int comp_size = 0;
+
+               comp_size = llapi_mirror_find_stale(layout, comp_array,
+                                                   ARRAY_SIZE(comp_array),
+                                                   &mirror_ids[i], 1);
+               if (comp_size == 0)
+                       return false;
+       }
+
+       return true;
+}
+
+static int mirror_split(const char *fname, __u32 id, const char *pool,
                        enum mirror_flags mflags, const char *victim_file)
 {
        struct llapi_layout *layout;
@@ -1808,9 +1959,11 @@ static int mirror_split(const char *fname, __u32 id,
                return -EINVAL;
        }
 
-       rc = mirror_sanity_check_one(layout);
-       if (rc)
+       rc = llapi_layout_sanity(layout, false, true);
+       if (rc) {
+               llapi_layout_sanity_perror(rc);
                goto free_layout;
+       }
 
        rc = llapi_layout_mirror_count_get(layout, &mirror_count);
        if (rc) {
@@ -1826,7 +1979,13 @@ static int mirror_split(const char *fname, __u32 id,
                goto free_layout;
        }
 
-       if (mflags & MF_COMP_ID) {
+       if (mflags & MF_COMP_POOL) {
+               struct pool_to_id_cbdata data = { .pool = pool };
+
+               rc = llapi_layout_comp_iterate(layout, find_comp_id_by_pool,
+                                              &data);
+               id = data.id;
+       } else if (mflags & MF_COMP_ID) {
                rc = llapi_layout_comp_iterate(layout, find_comp_id, &id);
                id = mirror_id_of(id);
        } else {
@@ -1883,6 +2042,14 @@ static int mirror_split(const char *fname, __u32 id,
        if (victim_file == NULL) {
                /* use a temp file to store the splitted layout */
                if (mflags & MF_DESTROY) {
+                       if (last_non_stale_mirror(id, layout)) {
+                               rc = -EUCLEAN;
+                               fprintf(stderr,
+                                       "%s: cannot destroy the last non-stale mirror of file '%s'\n",
+                                       progname, fname);
+                               goto close_fd;
+                       }
+
                        fdv = llapi_create_volatile_idx(parent, mdt_index,
                                                        O_LOV_DELAY_CREATE);
                } else {
@@ -1944,6 +2111,72 @@ free_layout:
        return rc;
 }
 
+static inline
+int lfs_mirror_resync_file(const char *fname, struct ll_ioc_lease *ioc,
+                          __u16 *mirror_ids, int ids_nr);
+
+static int lfs_migrate_to_dom(int fd, int fdv, char *name,
+                             __u64 migration_flags,
+                             struct llapi_stripe_param *param,
+                             struct llapi_layout *layout)
+{
+       struct ll_ioc_lease *data = NULL;
+       int rc;
+
+       rc = llapi_lease_acquire(fd, LL_LEASE_RDLCK);
+       if (rc < 0) {
+               error_loc = "cannot get lease";
+               goto out_close;
+       }
+
+       /* Atomically put lease, merge layouts, resync and close. */
+       data = calloc(1, offsetof(typeof(*data), lil_ids[1024]));
+       if (!data) {
+               error_loc = "memory allocation";
+               goto out_close;
+       }
+       data->lil_mode = LL_LEASE_UNLCK;
+       data->lil_flags = LL_LEASE_LAYOUT_MERGE;
+       data->lil_count = 1;
+       data->lil_ids[0] = fdv;
+       rc = llapi_lease_set(fd, data);
+       if (rc < 0) {
+               error_loc = "cannot merge layout";
+               goto out_close;
+       } else if (rc == 0) {
+               rc = -EBUSY;
+               error_loc = "lost lease lock";
+               goto out_close;
+       }
+       close(fd);
+       close(fdv);
+
+       rc = lfs_mirror_resync_file(name, data, NULL, 0);
+       if (rc) {
+               error_loc = "cannot resync file";
+               goto out;
+       }
+
+       /* delete first mirror now */
+       rc = mirror_split(name, 1, NULL, MF_DESTROY, NULL);
+       if (rc < 0)
+               error_loc = "cannot delete old layout";
+       goto out;
+
+out_close:
+       close(fd);
+       close(fdv);
+out:
+       if (rc < 0)
+               fprintf(stderr, "error: %s: %s: %s: %s\n",
+                       progname, name, error_loc, strerror(-rc));
+       else if (migration_flags & MIGRATION_VERBOSE)
+               printf("%s\n", name);
+       if (data)
+               free(data);
+       return rc;
+}
+
 /**
  * Parse a string containing an target index list into an array of integers.
  *
@@ -1951,20 +2184,23 @@ free_layout:
  * indices and ranges, for example "1,2-4,7". Add the indices into the
  * \a tgts array and remove duplicates.
  *
- * \param[out] tgts    array to store indices in
- * \param[in] size     size of \a tgts array
- * \param[in] offset   starting index in \a tgts
- * \param[in] arg      string containing OST index list
+ * \param[out] tgts            array to store indices in
+ * \param[in] size             size of \a tgts array
+ * \param[in] offset           starting index in \a tgts
+ * \param[in] arg              string containing OST index list
+ * \param[in/out] overstriping index list may contain duplicates
  *
  * \retval positive    number of indices in \a tgts
  * \retval -EINVAL     unable to parse \a arg
  */
-static int parse_targets(__u32 *tgts, int size, int offset, char *arg)
+static int parse_targets(__u32 *tgts, int size, int offset, char *arg,
+                        unsigned long long *pattern)
 {
        int rc;
        int nr = offset;
        int slots = size - offset;
        char *ptr = NULL;
+       bool overstriped = false;
        bool end_of_loop;
 
        if (arg == NULL)
@@ -1972,8 +2208,8 @@ static int parse_targets(__u32 *tgts, int size, int offset, char *arg)
 
        end_of_loop = false;
        while (!end_of_loop) {
-               int start_index;
-               int end_index;
+               int start_index = 0;
+               int end_index = 0;
                int i;
                char *endptr = NULL;
 
@@ -2004,14 +2240,21 @@ static int parse_targets(__u32 *tgts, int size, int offset, char *arg)
 
                        /* remove duplicate */
                        for (j = 0; j < offset; j++) {
-                               if (tgts[j] == i)
-                                       break;
+                               if (tgts[j] == i && pattern &&
+                                   *pattern == LLAPI_LAYOUT_OVERSTRIPING)
+                                       overstriped = true;
+                               else if (tgts[j] == i)
+                                       return -EINVAL;
                        }
-                       if (j == offset) { /* no duplicate */
+
+                       j = offset;
+
+                       if (j == offset) { /* check complete */
                                tgts[nr++] = i;
                                --slots;
                        }
                }
+
                if (slots == 0 && i < end_index)
                        break;
 
@@ -2023,12 +2266,16 @@ static int parse_targets(__u32 *tgts, int size, int offset, char *arg)
        if (!end_of_loop && ptr != NULL)
                *ptr = ',';
 
+       if (!overstriped && pattern)
+               *pattern = LLAPI_LAYOUT_DEFAULT;
+
        return rc < 0 ? rc : nr;
 }
 
 struct lfs_setstripe_args {
        unsigned long long       lsa_comp_end;
        unsigned long long       lsa_stripe_size;
+       unsigned long long       lsa_extension_size;
        long long                lsa_stripe_count;
        long long                lsa_stripe_off;
        __u32                    lsa_comp_flags;
@@ -2037,6 +2284,7 @@ struct lfs_setstripe_args {
        unsigned int             lsa_mirror_count;
        int                      lsa_nr_tgts;
        bool                     lsa_first_comp;
+       bool                     lsa_extension_comp;
        __u32                   *lsa_tgts;
        char                    *lsa_pool_name;
 };
@@ -2090,7 +2338,6 @@ static inline bool setstripe_args_specified(struct lfs_setstripe_args *lsa)
                lsa->lsa_stripe_count != LLAPI_LAYOUT_DEFAULT ||
                lsa->lsa_stripe_off != LLAPI_LAYOUT_DEFAULT ||
                lsa->lsa_pattern != LLAPI_LAYOUT_RAID0 ||
-               lsa->lsa_pool_name != NULL ||
                lsa->lsa_comp_end != 0);
 }
 
@@ -2110,16 +2357,20 @@ static int comp_args_to_layout(struct llapi_layout **composite,
 {
        struct llapi_layout *layout = *composite;
        uint64_t prev_end = 0;
+       uint64_t size;
        int i = 0, rc;
 
+new_comp:
        if (layout == NULL) {
                layout = llapi_layout_alloc();
                if (layout == NULL) {
                        fprintf(stderr, "Alloc llapi_layout failed. %s\n",
                                strerror(errno));
-                       return -ENOMEM;
+                       errno = ENOMEM;
+                       return -1;
                }
                *composite = layout;
+               lsa->lsa_first_comp = true;
        } else {
                uint64_t start;
 
@@ -2145,18 +2396,32 @@ static int comp_args_to_layout(struct llapi_layout **composite,
                        return rc;
                }
        }
-       /* reset lsa_first_comp */
-       lsa->lsa_first_comp = false;
+
+       rc = llapi_layout_comp_flags_set(layout, lsa->lsa_comp_flags);
+       if (rc) {
+               fprintf(stderr, "Set flags 0x%x failed: %s\n",
+                       lsa->lsa_comp_flags, strerror(errno));
+               return rc;
+       }
 
        if (set_extent) {
+               uint64_t comp_end = lsa->lsa_comp_end;
+
+               /* The extendable component is 0-length, so it can be removed
+                * if there is insufficient space to extend it. */
+               if (lsa->lsa_extension_comp)
+                       comp_end = prev_end;
+
                rc = llapi_layout_comp_extent_set(layout, prev_end,
-                                                 lsa->lsa_comp_end);
+                                                 comp_end);
                if (rc) {
-                       fprintf(stderr, "Set extent [%lu, %llu) failed. %s\n",
-                               prev_end, lsa->lsa_comp_end, strerror(errno));
+                       fprintf(stderr, "Set extent [%lu, %lu) failed. %s\n",
+                               prev_end, comp_end, strerror(errno));
                        return rc;
                }
        }
+       /* reset lsa_first_comp */
+       lsa->lsa_first_comp = false;
 
        /* Data-on-MDT component setting */
        if (lsa->lsa_pattern == LLAPI_LAYOUT_MDT) {
@@ -2166,47 +2431,68 @@ static int comp_args_to_layout(struct llapi_layout **composite,
                        fprintf(stderr, "Option 'stripe-count' can't be "
                                "specified with Data-on-MDT component: %lld\n",
                                lsa->lsa_stripe_count);
-                       return -EINVAL;
+                       errno = EINVAL;
+                       return -1;
                }
                if (lsa->lsa_stripe_size != LLAPI_LAYOUT_DEFAULT) {
                        fprintf(stderr, "Option 'stripe-size' can't be "
                                "specified with Data-on-MDT component: %llu\n",
                                lsa->lsa_stripe_size);
-                       return -EINVAL;
+                       errno = EINVAL;
+                       return -1;
                }
                if (lsa->lsa_nr_tgts != 0) {
                        fprintf(stderr, "Option 'ost-list' can't be specified "
                                "with Data-on-MDT component: '%i'\n",
                                lsa->lsa_nr_tgts);
-                       return -EINVAL;
+                       errno = EINVAL;
+                       return -1;
                }
                if (lsa->lsa_stripe_off != LLAPI_LAYOUT_DEFAULT) {
                        fprintf(stderr, "Option 'stripe-offset' can't be "
                                "specified with Data-on-MDT component: %lld\n",
                                lsa->lsa_stripe_off);
-                       return -EINVAL;
+                       errno = EINVAL;
+                       return -1;
                }
                if (lsa->lsa_pool_name != 0) {
                        fprintf(stderr, "Option 'pool' can't be specified "
                                "with Data-on-MDT component: '%s'\n",
                                lsa->lsa_pool_name);
-                       return -EINVAL;
+                       errno = EINVAL;
+                       return -1;
                }
 
                rc = llapi_layout_pattern_set(layout, lsa->lsa_pattern);
                if (rc) {
                        fprintf(stderr, "Set stripe pattern %#llx failed. %s\n",
-                               lsa->lsa_pattern, strerror(errno));
+                               lsa->lsa_pattern,
+                               strerror(errno));
                        return rc;
                }
                /* Data-on-MDT component has always single stripe up to end */
                lsa->lsa_stripe_size = lsa->lsa_comp_end;
+       } else if (lsa->lsa_pattern == LLAPI_LAYOUT_OVERSTRIPING) {
+               rc = llapi_layout_pattern_set(layout, lsa->lsa_pattern);
+               if (rc) {
+                       fprintf(stderr, "Set stripe pattern %#llx failed. %s\n",
+                               lsa->lsa_pattern,
+                               strerror(errno));
+                       return rc;
+               }
        }
 
-       rc = llapi_layout_stripe_size_set(layout, lsa->lsa_stripe_size);
+       size = lsa->lsa_comp_flags & LCME_FL_EXTENSION ?
+               lsa->lsa_extension_size : lsa->lsa_stripe_size;
+
+       if (lsa->lsa_comp_flags & LCME_FL_EXTENSION)
+               rc = llapi_layout_extension_size_set(layout, size);
+       else
+               rc = llapi_layout_stripe_size_set(layout, size);
+
        if (rc) {
-               fprintf(stderr, "Set stripe size %llu failed: %s\n",
-                       lsa->lsa_stripe_size, strerror(errno));
+               fprintf(stderr, "Set stripe size %lu failed: %s\n",
+                       size, strerror(errno));
                return rc;
        }
 
@@ -2217,13 +2503,6 @@ static int comp_args_to_layout(struct llapi_layout **composite,
                return rc;
        }
 
-       rc = llapi_layout_comp_flags_set(layout, lsa->lsa_comp_flags);
-       if (rc) {
-               fprintf(stderr, "Set flags 0x%x failed: %s\n",
-                       lsa->lsa_comp_flags, strerror(errno));
-               return rc;
-       }
-
        if (lsa->lsa_pool_name != NULL) {
                rc = llapi_layout_pool_name_set(layout, lsa->lsa_pool_name);
                if (rc) {
@@ -2246,8 +2525,10 @@ static int comp_args_to_layout(struct llapi_layout **composite,
                    lsa->lsa_stripe_count != LLAPI_LAYOUT_WIDE &&
                    lsa->lsa_nr_tgts != lsa->lsa_stripe_count) {
                        fprintf(stderr, "stripe_count(%lld) != nr_tgts(%d)\n",
-                               lsa->lsa_stripe_count, lsa->lsa_nr_tgts);
-                       return -EINVAL;
+                               lsa->lsa_stripe_count,
+                               lsa->lsa_nr_tgts);
+                       errno = EINVAL;
+                       return -1;
                }
                for (i = 0; i < lsa->lsa_nr_tgts; i++) {
                        rc = llapi_layout_ost_index_set(layout, i,
@@ -2265,7 +2546,14 @@ static int comp_args_to_layout(struct llapi_layout **composite,
                return rc;
        }
 
-       return 0;
+       /* Create the second, virtual component of extension space */
+       if (lsa->lsa_extension_comp) {
+               lsa->lsa_comp_flags |= LCME_FL_EXTENSION;
+               lsa->lsa_extension_comp = false;
+               goto new_comp;
+       }
+
+       return rc;
 }
 
 static int build_component(struct llapi_layout **layout,
@@ -2326,6 +2614,10 @@ static int build_layout_from_yaml_node(struct cYAML *node,
                                } else if (!strcmp(string, "pattern")) {
                                        if (!strcmp(node->cy_valuestring, "mdt"))
                                                lsa->lsa_pattern = LLAPI_LAYOUT_MDT;
+                                       if (!strcmp(node->cy_valuestring,
+                                                   "raid0,overstriped"))
+                                               lsa->lsa_pattern =
+                                                       LLAPI_LAYOUT_OVERSTRIPING;
                                } else if (!strcmp(string, "lcme_flags")) {
                                        rc = comp_str2flags(node->cy_valuestring,
                                                            &lsa->lsa_comp_flags,
@@ -2417,50 +2709,133 @@ err:
        return rc;
 }
 
-/* In 'lfs setstripe --component-add' mode, we need to fetch the extent
- * end of the last component in the existing file, and adjust the
- * first extent start of the components to be added accordingly. */
-static int adjust_first_extent(char *fname, struct llapi_layout *layout)
+/**
+ * Get the extension size from the next (SEL) component and extend the
+ * current component on it. The start of the next component is to be
+ * adjusted as well.
+ *
+ * \param[in] layout   the current layout
+ * \param[in] start    the start of the current component
+ * \param[in,out] end  the end of the current component
+ * \param[in] offset   the offset to adjust the end position to instead of
+ *                     extension size
+ *
+ * \retval 0           - extended successfully
+ * \retval < 0         - error
+ */
+static int layout_extend_comp(struct llapi_layout *layout,
+                             uint64_t start, uint64_t *end,
+                             uint64_t offset)
 {
-       struct llapi_layout *head;
-       uint64_t start, end, stripe_size, prev_end = 0;
+       uint64_t size, next_start, next_end;
        int rc;
 
-       if (layout == NULL) {
-               fprintf(stderr,
-                       "%s setstripe: layout must be specified\n",
-                       progname);
-               return -EINVAL;
+       rc = llapi_layout_comp_use(layout, LLAPI_LAYOUT_COMP_USE_NEXT);
+       if (rc < 0) {
+               fprintf(stderr, "%s setstripe: cannot move component cursor: "
+                       "%s\n", progname, strerror(errno));
+               return rc;
        }
 
-       errno = 0;
-       head = llapi_layout_get_by_path(fname, 0);
-       if (head == NULL) {
-               fprintf(stderr,
-                       "%s setstripe: cannot read layout from '%s': %s\n",
-                       progname, fname, strerror(errno));
-               return -EINVAL;
-       } else if (errno == ENODATA) {
-               /* file without LOVEA, this component-add will be turned
-                * into a component-create. */
-               llapi_layout_free(head);
-               return -ENODATA;
-       } else if (!llapi_layout_is_composite(head)) {
-               fprintf(stderr, "%s setstripe: '%s' not a composite file\n",
-                       progname, fname);
-               llapi_layout_free(head);
-               return -EINVAL;
+       /* Even if the @size will not be used below, this will fail if
+        * this is not a SEL component - a good confirmation we are
+        * working on right components. */
+       rc = llapi_layout_extension_size_get(layout, &size);
+       if (rc < 0) {
+               fprintf(stderr, "%s setstripe: cannot get component ext size: "
+                       "%s\n", progname, strerror(errno));
+               return rc;
        }
 
-       rc = llapi_layout_comp_extent_get(head, &start, &prev_end);
+       rc = llapi_layout_comp_extent_get(layout, &next_start, &next_end);
        if (rc) {
-               fprintf(stderr, "%s setstripe: cannot get prev extent: %s\n",
+               fprintf(stderr, "%s setstripe: cannot get extent: %s\n",
+                       progname, strerror(errno));
+               return rc;
+       }
+
+       next_start += offset ?: size;
+       rc = llapi_layout_comp_extent_set(layout, next_start, next_end);
+       if (rc) {
+               fprintf(stderr, "%s setstripe: cannot set extent: %s\n",
+                       progname, strerror(errno));
+               return rc;
+       }
+
+       rc = llapi_layout_comp_use(layout, LLAPI_LAYOUT_COMP_USE_PREV);
+       if (rc < 0) {
+               fprintf(stderr, "%s setstripe: cannot move component cursor: "
+                       "%s\n", progname, strerror(errno));
+               return rc;
+       }
+
+       *end += offset ?: size;
+       rc = llapi_layout_comp_extent_set(layout, start, *end);
+       if (rc) {
+               fprintf(stderr, "%s setstripe: cannot set extent: %s\n",
                        progname, strerror(errno));
-               llapi_layout_free(head);
                return rc;
        }
 
-       llapi_layout_free(head);
+       return 0;
+}
+
+/**
+ * In 'lfs setstripe --component-add' mode, we need to fetch the extent
+ * end of the last component in the existing file, and adjust the
+ * first extent start of the components to be added accordingly.
+ *
+ * In the create mode, we need to check if the first component is an extendable
+ * SEL component and extend its length to the extension size (first component
+ * of the PFL file is initialised at the create time, cannot be 0-lenght.
+ */
+static int layout_adjust_first_extent(char *fname, struct llapi_layout *layout,
+                                     bool comp_add)
+{
+       struct llapi_layout *head;
+       uint64_t start = 0, prev_end = 0;
+       uint64_t end;
+       int rc, ret = 0;
+
+       if (layout == NULL)
+               return 0;
+
+       errno = 0;
+       while (comp_add) {
+               head = llapi_layout_get_by_path(fname, 0);
+               if (head == NULL) {
+                       fprintf(stderr,
+                               "%s setstripe: cannot read layout from '%s': "
+                               "%s\n", progname, fname, strerror(errno));
+                       return -EINVAL;
+               } else if (errno == ENODATA) {
+                       /* file without LOVEA, this component-add will be turned
+                        * into a component-create. */
+                       llapi_layout_free(head);
+                       ret = -ENODATA;
+
+                       /* the new layout will be added to an empty one, it
+                        * still needs to be adjusted below */
+                       comp_add = 0;
+                       break;
+               } else if (!llapi_layout_is_composite(head)) {
+                       fprintf(stderr, "%s setstripe: '%s' not a composite "
+                               "file\n", progname, fname);
+                       llapi_layout_free(head);
+                       return -EINVAL;
+               }
+
+               rc = llapi_layout_comp_extent_get(head, &start, &prev_end);
+               if (rc) {
+                       fprintf(stderr, "%s setstripe: cannot get prev "
+                               "extent: %s\n", progname, strerror(errno));
+                       llapi_layout_free(head);
+                       return rc;
+               }
+
+               llapi_layout_free(head);
+               break;
+       }
 
        /* Make sure we use the first component of the layout to be added. */
        rc = llapi_layout_comp_use(layout, LLAPI_LAYOUT_COMP_USE_FIRST);
@@ -2478,37 +2853,46 @@ static int adjust_first_extent(char *fname, struct llapi_layout *layout)
                return rc;
        }
 
-       if (start > prev_end || end <= prev_end) {
-               fprintf(stderr,
-                       "%s setstripe: first extent [%lu, %lu) not adjacent with extent end %lu\n",
-                       progname, start, end, prev_end);
-               return -EINVAL;
-       }
-
-       rc = llapi_layout_stripe_size_get(layout, &stripe_size);
-       if (rc) {
-               fprintf(stderr, "%s setstripe: cannot get stripe size: %s\n",
-                       progname, strerror(errno));
-               return rc;
+       if (start == 0 && end == 0) {
+               rc = layout_extend_comp(layout, start, &end,
+                                       comp_add ? prev_end : 0);
+               if (rc)
+                       return rc;
        }
 
-       if (stripe_size != LLAPI_LAYOUT_DEFAULT &&
-           (prev_end & (stripe_size - 1))) {
-               fprintf(stderr,
-                       "%s setstripe: stripe size %lu not aligned with %lu\n",
-                       progname, stripe_size, prev_end);
+       if (start > prev_end || end < prev_end) {
+               fprintf(stderr, "%s setstripe: first extent [%lu, %lu) not "
+                       "adjacent with extent end %lu\n",
+                       progname, start, end, prev_end);
                return -EINVAL;
        }
 
        rc = llapi_layout_comp_extent_set(layout, prev_end, end);
        if (rc) {
-               fprintf(stderr,
-                       "%s setstripe: cannot set component extent [%lu, %lu): %s\n",
+               fprintf(stderr, "%s setstripe: cannot set component extent "
+                       "[%lu, %lu): %s\n",
                        progname, prev_end, end, strerror(errno));
                return rc;
        }
 
-       return 0;
+       return ret;
+}
+
+static int mirror_adjust_first_extents(struct mirror_args *list)
+{
+       int rc = 0;
+
+       if (list == NULL)
+               return 0;
+
+       while (list != NULL) {
+               rc = layout_adjust_first_extent(NULL, list->m_layout, false);
+               if (rc)
+                       break;
+               list = list->m_next;
+       }
+
+       return rc;
 }
 
 static inline bool arg_is_eof(char *arg)
@@ -2679,7 +3063,8 @@ static int lfs_setstripe_internal(int argc, char **argv,
        { .val = 'c',   .name = "stripe-count", .has_arg = required_argument},
        { .val = 'c',   .name = "stripe_count", .has_arg = required_argument},
        { .val = 'c',   .name = "mdt-count",    .has_arg = required_argument},
-/* find        { .val = 'C',   .name = "ctime",        .has_arg = required_argument }*/
+       { .val = 'C',   .name = "overstripe-count",
+                                               .has_arg = required_argument},
        { .val = 'd',   .name = "delete",       .has_arg = no_argument},
        { .val = 'd',   .name = "destroy",      .has_arg = no_argument},
        /* --non-direct is only valid in migrate mode */
@@ -2697,6 +3082,7 @@ static int lfs_setstripe_internal(int argc, char **argv,
        { .val = 'i',   .name = "stripe_index", .has_arg = required_argument},
        { .val = 'I',   .name = "comp-id",      .has_arg = required_argument},
        { .val = 'I',   .name = "component-id", .has_arg = required_argument},
+/* find { .val = 'l',  .name = "lazy",         .has_arg = no_argument }, */
        { .val = 'L',   .name = "layout",       .has_arg = required_argument },
        { .val = 'm',   .name = "mdt",          .has_arg = required_argument},
        { .val = 'm',   .name = "mdt-index",    .has_arg = required_argument},
@@ -2724,6 +3110,8 @@ static int lfs_setstripe_internal(int argc, char **argv,
        { .val = 'v',   .name = "verbose",      .has_arg = no_argument},
        { .val = 'x',   .name = "xattr",        .has_arg = required_argument },
        { .val = 'y',   .name = "yaml",         .has_arg = required_argument },
+       { .val = 'z',   .name = "ext-size",     .has_arg = required_argument},
+       { .val = 'z',   .name = "extension-size", .has_arg = required_argument},
        { .name = NULL } };
 
        setstripe_args_init(&lsa);
@@ -2731,12 +3119,17 @@ static int lfs_setstripe_internal(int argc, char **argv,
        migrate_mode = (opc == SO_MIGRATE);
        mirror_mode = (opc == SO_MIRROR_CREATE || opc == SO_MIRROR_EXTEND);
        setstripe_mode = (opc == SO_SETSTRIPE);
+       if (opc == SO_MIRROR_DELETE) {
+               delete = 1;
+               mirror_flags = MF_DESTROY;
+       }
 
        snprintf(cmd, sizeof(cmd), "%s %s", progname, argv[0]);
        progname = cmd;
        while ((c = getopt_long(argc, argv,
-                               "bc:dDE:f:H:i:I:m:N::no:p:L:s:S:vx:y:",
+                               "bc:C:dDE:f:H:i:I:m:N::no:p:L:s:S:vx:y:z:",
                                long_opts, NULL)) >= 0) {
+               size_units = 1;
                switch (c) {
                case 0:
                        /* Long options. */
@@ -2757,14 +3150,6 @@ static int lfs_setstripe_internal(int argc, char **argv,
                                        progname);
                                goto usage_error;
                        }
-                       if (lsa.lsa_comp_neg_flags & LCME_FL_STALE) {
-                               fprintf(stderr,
-                                       "%s: cannot clear 'stale' flags from component. Please use lfs-mirror-resync(1) instead\n",
-                                       progname);
-                               result = -EINVAL;
-                               goto error;
-                       }
-
                        break;
                case LFS_COMP_SET_OPT:
                        comp_set = 1;
@@ -2813,7 +3198,7 @@ static int lfs_setstripe_internal(int argc, char **argv,
                                result = -EINVAL;
                                goto usage_error;
                        }
-                       if (last_mirror->m_flags & ~LCME_USER_FLAGS) {
+                       if (last_mirror->m_flags & ~LCME_USER_MIRROR_FLAGS) {
                                fprintf(stderr,
                                        "%s: unsupported mirror flags: %s\n",
                                        progname, optarg);
@@ -2866,6 +3251,9 @@ static int lfs_setstripe_internal(int argc, char **argv,
                        }
                        migration_block = true;
                        break;
+               case 'C':
+                       lsa.lsa_pattern = LLAPI_LAYOUT_OVERSTRIPING;
+                       /* fall through */
                case 'c':
                        lsa.lsa_stripe_count = strtoul(optarg, &end, 0);
                        if (*end != '\0') {
@@ -2905,9 +3293,8 @@ static int lfs_setstripe_internal(int argc, char **argv,
                        if (lsa.lsa_comp_end != 0) {
                                result = comp_args_to_layout(lpp, &lsa, true);
                                if (result) {
-                                       fprintf(stderr,
-                                               "%s %s: invalid layout\n",
-                                               progname, argv[0]);
+                                       fprintf(stderr, "%s: invalid layout\n",
+                                               progname);
                                        goto usage_error;
                                }
 
@@ -3021,7 +3408,7 @@ static int lfs_setstripe_internal(int argc, char **argv,
                        migrate_mdt_mode = true;
                        lsa.lsa_nr_tgts = parse_targets(tgts,
                                                sizeof(tgts) / sizeof(__u32),
-                                               lsa.lsa_nr_tgts, optarg);
+                                               lsa.lsa_nr_tgts, optarg, NULL);
                        if (lsa.lsa_nr_tgts < 0) {
                                fprintf(stderr,
                                        "%s %s: invalid MDT target(s) '%s'\n",
@@ -3090,9 +3477,15 @@ static int lfs_setstripe_internal(int argc, char **argv,
                                fprintf(stderr, "warning: '--ost-list' is "
                                        "deprecated, use '--ost' instead\n");
 #endif
+                       /* -o allows overstriping, and must note it because
+                        * parse_targets is shared with MDT striping, which
+                        * does not allow duplicates
+                        */
+                       lsa.lsa_pattern = LLAPI_LAYOUT_OVERSTRIPING;
                        lsa.lsa_nr_tgts = parse_targets(tgts,
                                                sizeof(tgts) / sizeof(__u32),
-                                               lsa.lsa_nr_tgts, optarg);
+                                               lsa.lsa_nr_tgts, optarg,
+                                               &lsa.lsa_pattern);
                        if (lsa.lsa_nr_tgts < 0) {
                                fprintf(stderr,
                                        "%s %s: invalid OST target(s) '%s'\n",
@@ -3141,6 +3534,19 @@ static int lfs_setstripe_internal(int argc, char **argv,
                        from_yaml = true;
                        template = optarg;
                        break;
+               case 'z':
+                       result = llapi_parse_size(optarg,
+                                                 &lsa.lsa_extension_size,
+                                                 &size_units, 0);
+                       if (result) {
+                               fprintf(stderr,
+                                       "%s %s: invalid extension size '%s'\n",
+                                       progname, argv[0], optarg);
+                               goto usage_error;
+                       }
+
+                       lsa.lsa_extension_comp = true;
+                       break;
                default:
                        fprintf(stderr, "%s %s: unrecognized option '%s'\n",
                                progname, argv[0], argv[optind - 1]);
@@ -3194,8 +3600,12 @@ static int lfs_setstripe_internal(int argc, char **argv,
 
        if (lsa.lsa_comp_end != 0) {
                result = comp_args_to_layout(lpp, &lsa, true);
-               if (result)
+               if (result) {
+                       fprintf(stderr, "error: %s: invalid layout\n",
+                               progname);
+                       result = -EINVAL;
                        goto error;
+               }
        }
 
        if (mirror_flags & MF_NO_VERIFY) {
@@ -3214,9 +3624,6 @@ static int lfs_setstripe_internal(int argc, char **argv,
                }
        }
 
-       /* Only LCME_FL_INIT flags is used in PFL, and it shouldn't be
-        * altered by user space tool, so we don't need to support the
-        * --component-set for this moment. */
        if (comp_set && !comp_id) {
                fprintf(stderr, "%s %s: --component-set doesn't have component-id set\n",
                        progname, argv[0]);
@@ -3279,12 +3686,21 @@ static int lfs_setstripe_internal(int argc, char **argv,
                                progname, argv[0]);
                        goto usage_error;
                }
+       }
 
-               result = adjust_first_extent(fname, layout);
+       if (layout != NULL || mirror_list != NULL) {
+               if (mirror_list)
+                       result = mirror_adjust_first_extents(mirror_list);
+               else
+                       result = layout_adjust_first_extent(fname, layout,
+                                                           comp_add);
                if (result == -ENODATA)
                        comp_add = 0;
-               else if (result != 0)
+               else if (result != 0) {
+                       fprintf(stderr, "error: %s: invalid layout\n",
+                               progname);
                        goto error;
+               }
        }
 
        if (from_yaml && from_copy) {
@@ -3309,11 +3725,11 @@ static int lfs_setstripe_internal(int argc, char **argv,
                goto usage_error;
        }
 
-       if (!comp_del && !comp_set && (opc != SO_MIRROR_SPLIT) &&
-           comp_id != 0) {
+       if (!comp_del && !comp_set && opc != SO_MIRROR_SPLIT &&
+           opc != SO_MIRROR_DELETE && comp_id != 0) {
                fprintf(stderr,
-               "%s %s: option -I can only be used with --component-del or --component-set or lfs mirror split\n",
-                       progname, argv[0]);
+                       "%s: option -I can only be used with --component-del or --component-set or lfs mirror split\n",
+                       progname);
                goto usage_error;
        }
 
@@ -3343,10 +3759,12 @@ static int lfs_setstripe_internal(int argc, char **argv,
                if (lsa.lsa_pattern != LLAPI_LAYOUT_RAID0)
                        lmu->lum_hash_type = lsa.lsa_pattern;
                else
-                       lmu->lum_hash_type = LMV_HASH_TYPE_FNV_1A_64;
-               if (lsa.lsa_pool_name)
+                       lmu->lum_hash_type = LMV_HASH_TYPE_DEFAULT;
+               if (lsa.lsa_pool_name) {
                        strncpy(lmu->lum_pool_name, lsa.lsa_pool_name,
-                               sizeof(lmu->lum_pool_name));
+                               sizeof(lmu->lum_pool_name) - 1);
+                       lmu->lum_pool_name[sizeof(lmu->lum_pool_name) - 1] = 0;
+               }
                if (lsa.lsa_nr_tgts > 1) {
                        int i;
 
@@ -3356,7 +3774,7 @@ static int lfs_setstripe_internal(int argc, char **argv,
                                fprintf(stderr,
                                        "error: %s: stripe count %lld doesn't match the number of MDTs: %d\n",
                                        progname, lsa.lsa_stripe_count,
-                                               lsa.lsa_nr_tgts);
+                                       lsa.lsa_nr_tgts);
                                free(lmu);
                                goto usage_error;
                        }
@@ -3395,6 +3813,14 @@ static int lfs_setstripe_internal(int argc, char **argv,
                        param->lsp_stripe_offset = -1;
                else
                        param->lsp_stripe_offset = lsa.lsa_stripe_off;
+               param->lsp_stripe_pattern =
+                               llapi_pattern_to_lov(lsa.lsa_pattern);
+               if (param->lsp_stripe_pattern == EINVAL) {
+                       fprintf(stderr, "error: %s: invalid stripe pattern\n",
+                               argv[0]);
+                       free(param);
+                       goto usage_error;
+               }
                param->lsp_pool = lsa.lsa_pool_name;
                param->lsp_is_specific = false;
                if (lsa.lsa_nr_tgts > 0) {
@@ -3402,9 +3828,9 @@ static int lfs_setstripe_internal(int argc, char **argv,
                            lsa.lsa_stripe_count != LLAPI_LAYOUT_DEFAULT &&
                            lsa.lsa_stripe_count != LLAPI_LAYOUT_WIDE &&
                            lsa.lsa_nr_tgts != lsa.lsa_stripe_count) {
-                               fprintf(stderr, "error: %s: stripe count %lld "
-                                       "doesn't match the number of OSTs: %d\n"
-                                       argv[0], lsa.lsa_stripe_count,
+                               fprintf(stderr,
+                                       "error: %s: stripe count %lld doesn't match the number of OSTs: %d\n",
+                                       argv[0], lsa.lsa_stripe_count,
                                        lsa.lsa_nr_tgts);
                                free(param);
                                goto usage_error;
@@ -3458,18 +3884,21 @@ static int lfs_setstripe_internal(int argc, char **argv,
                } else if (opc == SO_MIRROR_EXTEND) {
                        result = mirror_extend(fname, mirror_list,
                                               mirror_flags);
-               } else if (opc == SO_MIRROR_SPLIT) {
-                       if (mirror_id == 0 && comp_id == 0) {
+               } else if (opc == SO_MIRROR_SPLIT || opc == SO_MIRROR_DELETE) {
+                       if (!mirror_id && !comp_id && !lsa.lsa_pool_name) {
                                fprintf(stderr,
-                       "%s %s: no mirror id or component id is specified\n",
-                                       progname, argv[0]);
+                                       "%s: no mirror specified to delete from '%s'\n",
+                                       progname, fname);
                                goto usage_error;
                        }
-                       if (mirror_id != 0)
+                       if (lsa.lsa_pool_name)
+                               mirror_flags |= MF_COMP_POOL;
+                       else if (mirror_id != 0)
                                comp_id = mirror_id;
                        else
                                mirror_flags |= MF_COMP_ID;
-                       result = mirror_split(fname, comp_id, mirror_flags,
+                       result = mirror_split(fname, comp_id, lsa.lsa_pool_name,
+                                             mirror_flags,
                                              has_m_file ? mirror_list->m_file :
                                              NULL);
                } else if (layout != NULL) {
@@ -3656,6 +4085,8 @@ static int name2layout(__u32 *layout, char *name)
                        *layout |= LOV_PATTERN_RAID0;
                else if (strcmp(layout_name, "mdt") == 0)
                        *layout |= LOV_PATTERN_MDT;
+               else if (strcmp(layout_name, "overstriping") == 0)
+                       *layout |= LOV_PATTERN_OVERSTRIPING;
                else
                        return -1;
        }
@@ -3711,6 +4142,7 @@ static int lfs_find(int argc, char **argv)
        { .val = 'i',   .name = "stripe-index", .has_arg = required_argument },
        { .val = 'i',   .name = "stripe_index", .has_arg = required_argument },
 /* getstripe { .val = 'I', .name = "comp-id",  .has_arg = required_argument }*/
+       { .val = 'l',   .name = "lazy",         .has_arg = no_argument },
        { .val = 'L',   .name = "layout",       .has_arg = required_argument },
        { .val = 'm',   .name = "mdt",          .has_arg = required_argument },
        { .val = 'm',   .name = "mdt-index",    .has_arg = required_argument },
@@ -3738,22 +4170,26 @@ static int lfs_find(int argc, char **argv)
        { .val = 'T',   .name = "mdt-count",    .has_arg = required_argument },
        { .val = 'u',   .name = "uid",          .has_arg = required_argument },
        { .val = 'U',   .name = "user",         .has_arg = required_argument },
+       { .val = 'z',   .name = "extension-size",
+                                               .has_arg = required_argument },
+       { .val = 'z',   .name = "ext-size",     .has_arg = required_argument },
 /* getstripe { .val = 'v', .name = "verbose",  .has_arg = no_argument }, */
 /* getstripe { .val = 'y', .name = "yaml",     .has_arg = no_argument }, */
        { .name = NULL } };
-        int pathstart = -1;
-        int pathend = -1;
-        int neg_opt = 0;
-        time_t *xtime;
-        int *xsign;
-        int isoption;
-        char *endptr;
+       int pathstart = -1;
+       int pathend = -1;
+       int pathbad = -1;
+       int neg_opt = 0;
+       time_t *xtime;
+       int *xsign;
+       int isoption;
+       char *endptr;
 
-        time(&t);
+       time(&t);
 
        /* when getopt_long_only() hits '!' it returns 1, puts "!" in optarg */
        while ((c = getopt_long_only(argc, argv,
-                       "-0A:b:c:C:D:E:g:G:H:i:L:m:M:n:N:O:Ppqrs:S:t:T:u:U:v",
+                       "-0A:b:c:C:D:E:g:G:H:i:L:m:M:n:N:O:Ppqrs:S:t:T:u:U:vz:",
                        long_opts, NULL)) >= 0) {
                 xtime = NULL;
                 xsign = NULL;
@@ -4002,6 +4438,9 @@ static int lfs_find(int argc, char **argv)
                        param.fp_check_hash_type = 1;
                        param.fp_exclude_hash_type = !!neg_opt;
                        break;
+               case 'l':
+                       param.fp_lazy = 1;
+                       break;
                case 'L':
                        ret = name2layout(&param.fp_layout, optarg);
                        if (ret)
@@ -4257,31 +4696,55 @@ err_free:
                        param.fp_check_mdt_count = 1;
                        param.fp_exclude_mdt_count = !!neg_opt;
                        break;
-                default:
-                        ret = CMD_HELP;
-                        goto err;
-                };
-        }
+               case 'z':
+                       if (optarg[0] == '+') {
+                               param.fp_ext_size_sign = -1;
+                               optarg++;
+                       } else if (optarg[0] == '-') {
+                               param.fp_ext_size_sign =  1;
+                               optarg++;
+                       }
 
-        if (pathstart == -1) {
-                fprintf(stderr, "error: %s: no filename|pathname\n",
-                        argv[0]);
-                ret = CMD_HELP;
-                goto err;
-        } else if (pathend == -1) {
-                /* no options */
-                pathend = argc;
-        }
+                       ret = llapi_parse_size(optarg, &param.fp_ext_size,
+                                              &param.fp_ext_size_units, 0);
+                       if (ret) {
+                               fprintf(stderr, "error: bad ext-size '%s'\n",
+                                       optarg);
+                               goto err;
+                       }
+                       param.fp_ext_size /= SEL_UNIT_SIZE;
+                       param.fp_ext_size_units /= SEL_UNIT_SIZE;
+                       param.fp_check_ext_size = 1;
+                       param.fp_exclude_ext_size = !!neg_opt;
+                       break;
+               default:
+                       ret = CMD_HELP;
+                       goto err;
+               };
+       }
+
+       if (pathstart == -1) {
+               fprintf(stderr, "error: %s: no filename|pathname\n",
+                       argv[0]);
+               ret = CMD_HELP;
+               goto err;
+       } else if (pathend == -1) {
+               /* no options */
+               pathend = argc;
+       }
 
        do {
                rc = llapi_find(argv[pathstart], &param);
-               if (rc != 0 && ret == 0)
+               if (rc && !ret) {
                        ret = rc;
+                       pathbad = pathstart;
+               }
        } while (++pathstart < pathend);
 
-        if (ret)
-                fprintf(stderr, "error: %s failed for %s.\n",
-                        argv[0], argv[optind - 1]);
+       if (ret)
+               fprintf(stderr, "%s: failed for '%s': %s\n",
+                       progname, argv[pathbad], strerror(-rc));
+
 err:
        if (param.fp_obd_uuid && param.fp_num_alloc_obds)
                free(param.fp_obd_uuid);
@@ -4329,6 +4792,7 @@ static int lfs_getstripe_internal(int argc, char **argv,
        { .val = 'i',   .name = "stripe_index", .has_arg = no_argument },
        { .val = 'I',   .name = "comp-id",      .has_arg = optional_argument },
        { .val = 'I',   .name = "component-id", .has_arg = optional_argument },
+/* find { .val = 'l',  .name = "lazy",         .has_arg = no_argument }, */
        { .val = 'L',   .name = "layout",       .has_arg = no_argument },
        { .val = 'm',   .name = "mdt",          .has_arg = no_argument },
        { .val = 'm',   .name = "mdt-index",    .has_arg = no_argument },
@@ -4351,6 +4815,8 @@ static int lfs_getstripe_internal(int argc, char **argv,
 /* find        { .val = 'U',   .name = "user",         .has_arg = required_argument }*/
        { .val = 'v',   .name = "verbose",      .has_arg = no_argument },
        { .val = 'y',   .name = "yaml",         .has_arg = no_argument },
+       { .val = 'z',   .name = "extension-size", .has_arg = no_argument },
+       { .val = 'z',   .name = "ext-size",     .has_arg = no_argument },
        { .name = NULL } };
        int c, rc;
        int neg_opt = 0;
@@ -4359,7 +4825,7 @@ static int lfs_getstripe_internal(int argc, char **argv,
        char *end, *tmp;
 
        while ((c = getopt_long(argc, argv,
-                       "-cdDE::FghiI::LmMNoO:pqrRsSvy",
+                       "-cdDE::FghiI::LmMNoO:pqrRsSvyz",
                        long_opts, NULL)) != -1) {
                if (neg_opt)
                        --neg_opt;
@@ -4619,6 +5085,12 @@ static int lfs_getstripe_internal(int argc, char **argv,
                case 'y':
                        param->fp_yaml = 1;
                        break;
+               case 'z':
+                       if (!(param->fp_verbose & VERBOSE_DETAIL)) {
+                               param->fp_verbose |= VERBOSE_EXT_SIZE;
+                               param->fp_max_depth = 0;
+                       }
+                       break;
                default:
                        return CMD_HELP;
                }
@@ -4831,6 +5303,27 @@ static inline int obd_statfs_ratio(const struct obd_statfs *st, bool inodes)
        return (ratio - (int)ratio) > 0 ? (int)(ratio + 1) : (int)ratio;
 }
 
+/* This is to identify various problem states for "lfs df" if .osn_err = true,
+ * so only show flags reflecting those states by default. Informational states
+ * are only shown with "-v" and use lower-case names to distinguish them.
+ * UNUSED[12] were for "EROFS = 30" until 1.6 but are now available for use.
+ */
+static struct obd_statfs_state_names {
+       enum obd_statfs_state   osn_state;
+       const char              osn_name;
+       bool                    osn_err;
+} oss_names[] = {
+       { .osn_state = OS_STATE_DEGRADED,    .osn_name = 'D', .osn_err = true },
+       { .osn_state = OS_STATE_READONLY,    .osn_name = 'R', .osn_err = true },
+       { .osn_state = OS_STATE_NOPRECREATE, .osn_name = 'N', .osn_err = true },
+       { .osn_state = OS_STATE_UNUSED1,     .osn_name = '?', .osn_err = true },
+       { .osn_state = OS_STATE_UNUSED2,     .osn_name = '?', .osn_err = true },
+       { .osn_state = OS_STATE_ENOSPC,      .osn_name = 'S', .osn_err = true },
+       { .osn_state = OS_STATE_ENOINO,      .osn_name = 'I', .osn_err = true },
+       { .osn_state = OS_STATE_SUM,         .osn_name = 'a', /* aggregate */ },
+       { .osn_state = OS_STATE_NONROT,      .osn_name = 'f', /* flash */     },
+};
+
 static int showdf(char *mntdir, struct obd_statfs *stat,
                  char *uuid, enum mntdf_flags flags,
                  char *type, int index, int rc)
@@ -4904,21 +5397,14 @@ static int showdf(char *mntdir, struct obd_statfs *stat,
                        printf("[%s:%d]", type, index);
 
                if (stat->os_state) {
-                       /*
-                        * Each character represents the matching
-                        * OS_STATE_* bit.
-                        */
-                       const char state_names[] = "DRSI";
-                       __u32      state;
-                       __u32      i;
+                       uint32_t i;
 
                        printf(" ");
-                       for (i = 0, state = stat->os_state;
-                            state && i < sizeof(state_names); i++) {
-                               if (!(state & (1 << i)))
-                                       continue;
-                               printf("%c", state_names[i]);
-                               state ^= 1 << i;
+                       for (i = 0; i < ARRAY_SIZE(oss_names); i++) {
+                               if (oss_names[i].osn_state & stat->os_state &&
+                                   (oss_names[i].osn_err ||
+                                    flags & MNTDF_VERBOSE))
+                                       printf("%c", oss_names[i].osn_name);
                        }
                }
 
@@ -5103,50 +5589,23 @@ static int mntdf(char *mntdir, char *fsname, char *pool, enum mntdf_flags flags,
        return rc;
 }
 
-static int ll_statfs_data_comp(const void *sd1, const void *sd2)
-{
-       const struct obd_statfs *st1 = &((const struct ll_statfs_data *)sd1)->
-                                               sd_st;
-       const struct obd_statfs *st2 = &((const struct ll_statfs_data *)sd2)->
-                                               sd_st;
-       int r1 = obd_statfs_ratio(st1, false);
-       int r2 = obd_statfs_ratio(st2, false);
-       int64_t result = r1 - r2;
-
-       /* if both space usage are above 90, compare free inodes */
-       if (r1 > 90 && r2 > 90)
-               result = st2->os_ffree - st1->os_ffree;
-
-       if (result < 0)
-               return -1;
-       else if (result == 0)
-               return 0;
-       else
-               return 1;
-}
-
 /* functions */
 static int lfs_setdirstripe(int argc, char **argv)
 {
-       char                    *dname;
-       int                     result;
-       struct lfs_setstripe_args        lsa = { 0 };
-       struct llapi_stripe_param       *param = NULL;
-       __u32                   mdts[LMV_MAX_STRIPE_COUNT] = { 0 };
-       char                    *end;
-       int                     c;
-       char                    *mode_opt = NULL;
-       bool                    default_stripe = false;
-       mode_t                  mode = S_IRWXU | S_IRWXG | S_IRWXO;
-       mode_t                  previous_mode = 0;
-       bool                    delete = false;
-       struct ll_statfs_buf    *lsb = NULL;
-       char                    mntdir[PATH_MAX] = "";
-       bool                    auto_distributed = false;
-       bool                    foreign_mode = false;
-       char                    *xattr = NULL;
-       __u32                   type = LU_FOREIGN_TYPE_DAOS, flags = 0;
-
+       char *dname;
+       struct lfs_setstripe_args lsa = { 0 };
+       struct llapi_stripe_param *param = NULL;
+       __u32 mdts[LMV_MAX_STRIPE_COUNT] = { 0 };
+       char *end;
+       int c;
+       char *mode_opt = NULL;
+       bool default_stripe = false;
+       bool delete = false;
+       bool foreign_mode = false;
+       mode_t mode = S_IRWXU | S_IRWXG | S_IRWXO;
+       mode_t previous_mode = 0;
+       char *xattr = NULL;
+       __u32 type = LU_FOREIGN_TYPE_DAOS, flags = 0;
        struct option long_opts[] = {
        { .val = 'c',   .name = "count",        .has_arg = required_argument },
        { .val = 'c',   .name = "mdt-count",    .has_arg = required_argument },
@@ -5162,6 +5621,7 @@ static int lfs_setdirstripe(int argc, char **argv)
        { .val = 'i',   .name = "mdt-index",    .has_arg = required_argument },
        { .val = 'i',   .name = "mdt",          .has_arg = required_argument },
 #else
+/* find { .val = 'l',  .name = "lazy",         .has_arg = no_argument }, */
        { .val = 'm',   .name = "mdt-index",    .has_arg = required_argument },
        { .val = 'm',   .name = "mdt",          .has_arg = required_argument },
 #endif
@@ -5176,6 +5636,7 @@ static int lfs_setdirstripe(int argc, char **argv)
 /* setstripe { .val = 'y', .name = "yaml",     .has_arg = no_argument }, */
        { .val = 'x',   .name = "xattr",        .has_arg = required_argument },
        { .name = NULL } };
+       int result = 0;
 
        setstripe_args_init(&lsa);
 
@@ -5255,7 +5716,7 @@ static int lfs_setdirstripe(int argc, char **argv)
 #endif
                        lsa.lsa_nr_tgts = parse_targets(mdts,
                                                sizeof(mdts) / sizeof(__u32),
-                                               lsa.lsa_nr_tgts, optarg);
+                                               lsa.lsa_nr_tgts, optarg, NULL);
                        if (lsa.lsa_nr_tgts < 0) {
                                fprintf(stderr,
                                        "%s %s: invalid MDT target(s) '%s'\n",
@@ -5383,16 +5844,17 @@ static int lfs_setdirstripe(int argc, char **argv)
        if (lsa.lsa_pattern != LLAPI_LAYOUT_RAID0)
                param->lsp_stripe_pattern = lsa.lsa_pattern;
        else
-               param->lsp_stripe_pattern = LMV_HASH_TYPE_FNV_1A_64;
+               param->lsp_stripe_pattern = LMV_HASH_TYPE_DEFAULT;
        param->lsp_pool = lsa.lsa_pool_name;
        param->lsp_is_specific = false;
        if (lsa.lsa_nr_tgts > 1) {
                if (lsa.lsa_stripe_count > 0 &&
                    lsa.lsa_stripe_count != LLAPI_LAYOUT_DEFAULT &&
                    lsa.lsa_stripe_count != lsa.lsa_nr_tgts) {
-                       fprintf(stderr, "error: %s: stripe count %lld doesn't "
-                               "match the number of MDTs: %d\n",
-                               argv[0], lsa.lsa_stripe_count, lsa.lsa_nr_tgts);
+                       fprintf(stderr,
+                               "error: %s: stripe count %lld doesn't match the number of MDTs: %d\n",
+                               argv[0], lsa.lsa_stripe_count,
+                               lsa.lsa_nr_tgts);
                        free(param);
                        return CMD_HELP;
                }
@@ -5406,114 +5868,23 @@ static int lfs_setdirstripe(int argc, char **argv)
        do {
                if (default_stripe) {
                        result = llapi_dir_set_default_lmv(dname, param);
-               } else {
-                       /* if current \a dname isn't under the same \a mntdir
-                        * as the last one, and the last one was
-                        * auto-distributed, restore \a param.
-                        */
-                       if (mntdir[0] != '\0' &&
-                           strncmp(dname, mntdir, strlen(mntdir)) &&
-                           auto_distributed) {
-                               param->lsp_is_specific = false;
-                               param->lsp_stripe_offset = -1;
-                               auto_distributed = false;
-                       }
-
-                       if (!param->lsp_is_specific &&
-                           param->lsp_stripe_offset == -1) {
-                               char path[PATH_MAX] = "";
-
-                               if (!lsb) {
-                                       lsb = malloc(sizeof(*lsb));
-                                       if (!lsb) {
-                                               result = -ENOMEM;
-                                               break;
-                                       }
-                               }
-                               lsb->sb_count = 0;
-
-                               /* use mntdir for dirname() temporarily */
-                               strncpy(mntdir, dname, sizeof(mntdir));
-                               if (!realpath(dirname(mntdir), path)) {
-                                       result = -errno;
-                                       fprintf(stderr,
-                                               "error: invalid path '%s': %s\n",
-                                               argv[optind], strerror(errno));
-                                       break;
-                               }
-                               mntdir[0] = '\0';
-
-                               result = llapi_search_mounts(path, 0, mntdir,
-                                                            NULL);
-                               if (result < 0 || mntdir[0] == '\0') {
-                                       fprintf(stderr,
-                                               "No suitable Lustre mount found\n");
-                                       break;
-                               }
-
-                               result = mntdf(mntdir, NULL, NULL, 0,
-                                              LL_STATFS_LMV, lsb);
-                               if (result < 0)
-                                       break;
-
-                               if (param->lsp_stripe_count > lsb->sb_count) {
-                                       fprintf(stderr,
-                                               "error: stripe count %d is too big\n",
-                                               param->lsp_stripe_count);
-                                       result = -ERANGE;
-                                       break;
-                               }
-
-                               qsort(lsb->sb_buf, lsb->sb_count,
-                                     sizeof(struct ll_statfs_data),
-                                     ll_statfs_data_comp);
-
-                               auto_distributed = true;
-                       }
-
-                       if (auto_distributed) {
-                               int r;
-                               int nr = MAX(param->lsp_stripe_count,
-                                            lsb->sb_count / 2);
-
-                               /* don't use server whose usage is above 90% */
-                               while (nr != param->lsp_stripe_count &&
-                                      obd_statfs_ratio(&lsb->sb_buf[nr].sd_st,
-                                                       false) > 90)
-                                       nr = MAX(param->lsp_stripe_count,
-                                                nr / 2);
-
-                               /* get \a r between [0, nr) */
-                               r = rand() % nr;
-
-                               param->lsp_stripe_offset =
-                                       lsb->sb_buf[r].sd_index;
-                               if (param->lsp_stripe_count > 1) {
-                                       int i = 0;
-
-                                       param->lsp_is_specific = true;
-                                       for (; i < param->lsp_stripe_count; i++)
-                                               param->lsp_tgts[(i + r) % nr] =
-                                                       lsb->sb_buf[i].sd_index;
-                               }
-                       }
-
-                       result = llapi_dir_create(dname, mode, param);
+                       if (result)
+                               fprintf(stderr,
+                                       "%s setdirstripe: cannot set default stripe on dir '%s': %s\n",
+                                       progname, dname, strerror(-result));
+                       continue;
                }
 
-               if (result) {
+               result = llapi_dir_create(dname, mode, param);
+               if (result)
                        fprintf(stderr,
-                               "%s setdirstripe: cannot create stripe dir '%s': %s\n",
+                               "%s setdirstripe: cannot create dir '%s': %s\n",
                                progname, dname, strerror(-result));
-                       break;
-               }
-               dname = argv[++optind];
-       } while (dname != NULL);
+       } while (!result && (dname = argv[++optind]));
 
        if (mode_opt != NULL)
                umask(previous_mode);
 
-       free(lsb);
        free(param);
        return result;
 }
@@ -5586,7 +5957,7 @@ static int lfs_mv(int argc, char **argv)
                }
        }
 
-       if (lmu.lum_stripe_offset == -1) {
+       if (lmu.lum_stripe_offset == LMV_OFFSET_DEFAULT) {
                fprintf(stderr, "%s mv: MDT index must be specified\n",
                        progname);
                return CMD_HELP;
@@ -6133,7 +6504,8 @@ quota_type_def:
                                fprintf(stderr,
                                        "%s setquota: warning: block softlimit '%llu' smaller than minimum qunit size\n"
                                        "See '%s help setquota' or Lustre manual for details\n",
-                                       progname, dqb->dqb_bsoftlimit,
+                                       progname,
+                                       (unsigned long long)dqb->dqb_bsoftlimit,
                                        progname);
                        break;
                case 'B':
@@ -6145,7 +6517,8 @@ quota_type_def:
                                fprintf(stderr,
                                        "%s setquota: warning: block hardlimit '%llu' smaller than minimum qunit size\n"
                                        "See '%s help setquota' or Lustre manual for details\n",
-                                       progname, dqb->dqb_bhardlimit,
+                                       progname,
+                                       (unsigned long long)dqb->dqb_bhardlimit,
                                        progname);
                        break;
                case 'i':
@@ -6156,7 +6529,8 @@ quota_type_def:
                                fprintf(stderr,
                                        "%s setquota: warning: inode softlimit '%llu' smaller than minimum qunit size\n"
                                        "See '%s help setquota' or Lustre manual for details\n",
-                                       progname, dqb->dqb_isoftlimit,
+                                       progname,
+                                       (unsigned long long)dqb->dqb_isoftlimit,
                                        progname);
                        break;
                case 'I':
@@ -6167,7 +6541,8 @@ quota_type_def:
                                fprintf(stderr,
                                        "%s setquota: warning: inode hardlimit '%llu' smaller than minimum qunit size\n"
                                        "See '%s help setquota' or Lustre manual for details\n",
-                                       progname, dqb->dqb_ihardlimit,
+                                       progname,
+                                       (unsigned long long)dqb->dqb_ihardlimit,
                                        progname);
                        break;
                default:
@@ -6417,7 +6792,7 @@ static void print_quota(char *mnt, struct if_quotactl *qctl, int type,
                        diff2str(dqb->dqb_btime, timebuf, now);
                else if (show_default)
                        snprintf(timebuf, sizeof(timebuf), "%llu",
-                                dqb->dqb_btime);
+                                (unsigned long long)dqb->dqb_btime);
 
                kbytes2str(lustre_stoqb(dqb->dqb_curspace),
                           strbuf, sizeof(strbuf), h);
@@ -6450,7 +6825,7 @@ static void print_quota(char *mnt, struct if_quotactl *qctl, int type,
                        diff2str(dqb->dqb_itime, timebuf, now);
                else if (show_default)
                        snprintf(timebuf, sizeof(timebuf), "%llu",
-                                dqb->dqb_itime);
+                                (unsigned long long)dqb->dqb_itime);
 
                snprintf(numbuf[0], sizeof(numbuf),
                         (dqb->dqb_valid & QIF_INODES) ? "%ju" : "[%ju]",
@@ -6870,17 +7245,19 @@ quota_type:
            optind == argc - 1 && !show_default) {
 
                qctl.qc_cmd = LUSTRE_Q_GETQUOTA;
-               qctl.qc_valid = valid;
                qctl.qc_idx = idx;
 
                for (qtype = USRQUOTA; qtype <= GRPQUOTA; qtype++) {
                        qctl.qc_type = qtype;
+                       qctl.qc_valid = valid;
                        if (qtype == USRQUOTA) {
                                qctl.qc_id = geteuid();
                                rc = uid2name(&name, qctl.qc_id);
                        } else {
                                qctl.qc_id = getegid();
                                rc = gid2name(&name, qctl.qc_id);
+                               memset(&qctl.qc_dqblk, 0,
+                                      sizeof(qctl.qc_dqblk));
                        }
                        if (rc)
                                name = "<unknown>";
@@ -7110,14 +7487,16 @@ static int lfs_changelog(int argc, char **argv)
                        struct changelog_ext_extra_flags *ef =
                                changelog_rec_extra_flags(rec);
 
-                       printf(" ef=0x%llx", ef->cr_extra_flags);
+                       printf(" ef=0x%llx",
+                              (unsigned long long)ef->cr_extra_flags);
 
                        if (ef->cr_extra_flags & CLFE_UIDGID) {
                                struct changelog_ext_uidgid *uidgid =
                                        changelog_rec_uidgid(rec);
 
                                printf(" u=%llu:%llu",
-                                      uidgid->cr_uid, uidgid->cr_gid);
+                                      (unsigned long long)uidgid->cr_uid,
+                                      (unsigned long long)uidgid->cr_gid);
                        }
                        if (ef->cr_extra_flags & CLFE_NID) {
                                struct changelog_ext_nid *nid =
@@ -7404,19 +7783,98 @@ static int lfs_path2fid(int argc, char **argv)
        return rc;
 }
 
-static int lfs_data_version(int argc, char **argv)
+#define MAX_ERRNO      4095
+#define IS_ERR_VALUE(x) ((unsigned long)(x) >= (unsigned long)-MAX_ERRNO)
+
+static int lfs_rmfid_and_show_errors(const char *device, struct fid_array *fa)
 {
-       char *path;
-       __u64 data_version;
-       int fd;
-       int rc;
-       int c;
-       int data_version_flags = LL_DV_RD_FLUSH; /* Read by default */
+       int rc, rc2 = 0, k;
 
-       if (argc < 2) {
-               fprintf(stderr, "%s data_version: FILE must be specified\n",
-                       progname);
-               return CMD_HELP;
+       rc = llapi_rmfid(device, fa);
+       if (rc) {
+               fprintf(stderr, "rmfid(): rc = %d\n", rc);
+               return rc;
+       }
+
+       for (k = 0; k < fa->fa_nr; k++) {
+               rc = (__s32)fa->fa_fids[k].f_ver;
+               if (!IS_ERR_VALUE(rc))
+                       continue;
+               if (!rc2 && rc)
+                       rc2 = rc;
+               if (!rc)
+                       continue;
+               fa->fa_fids[k].f_ver = 0;
+               fprintf(stderr, "rmfid("DFID"): rc = %d\n",
+                       PFID(&fa->fa_fids[k]), rc);
+       }
+
+       return rc2;
+}
+
+static int lfs_rmfid(int argc, char **argv)
+{
+       char *fidstr, *device;
+       int rc = 0, rc2, nr;
+       struct fid_array *fa;
+
+       if (optind > argc - 1) {
+               fprintf(stderr, "%s rmfid: missing dirname\n", progname);
+               return CMD_HELP;
+       }
+
+       device = argv[optind++];
+
+       nr = argc - optind;
+       fa = malloc(offsetof(struct fid_array, fa_fids[nr + 1]));
+       if (fa == NULL)
+               return -ENOMEM;
+
+       fa->fa_nr = 0;
+       rc = 0;
+       while (optind < argc) {
+               int found;
+
+               fidstr = argv[optind++];
+               while (*fidstr == '[')
+                       fidstr++;
+               found = sscanf(fidstr, SFID, RFID(&fa->fa_fids[fa->fa_nr]));
+               if (found != 3) {
+                       fprintf(stderr, "unrecognized FID: %s\n",
+                               argv[optind - 1]);
+                       exit(1);
+               }
+               fa->fa_nr++;
+               if (fa->fa_nr == OBD_MAX_FIDS_IN_ARRAY) {
+                       /* start another batch */
+                       rc2 = lfs_rmfid_and_show_errors(device, fa);
+                       if (rc2 && !rc)
+                               rc = rc2;
+                       fa->fa_nr = 0;
+               }
+       }
+       if (fa->fa_nr) {
+               rc2 = lfs_rmfid_and_show_errors(device, fa);
+               if (rc2 && !rc)
+                       rc = rc2;
+       }
+
+       return rc;
+}
+
+static int lfs_data_version(int argc, char **argv)
+{
+       char *path;
+       __u64 data_version;
+       int fd;
+       int rc;
+       int c;
+       int data_version_flags = LL_DV_RD_FLUSH; /* Read by default */
+
+       if (argc < 2) {
+               fprintf(stderr, "%s data_version: FILE must be specified\n",
+                       progname);
+               return CMD_HELP;
        }
 
        while ((c = getopt(argc, argv, "nrw")) != -1) {
@@ -8254,7 +8712,8 @@ static int lfs_heat_get(int argc, char **argv)
 
                printf("flags: %x\n", heat->lh_flags);
                for (i = 0; i < heat->lh_count; i++)
-                       printf("%s: %llu\n", heat_names[i], heat->lh_heat[i]);
+                       printf("%s: %llu\n", heat_names[i],
+                              (unsigned long long)heat->lh_heat[i]);
 next:
                if (rc == 0 && rc2 < 0)
                        rc = rc2;
@@ -8580,6 +9039,7 @@ int lfs_mirror_resync_file(const char *fname, struct ll_ioc_lease *ioc,
        int idx;
        int fd;
        int rc;
+       int rc2;
 
        if (stat(fname, &stbuf) < 0) {
                fprintf(stderr, "%s: cannot stat file '%s': %s.\n",
@@ -8644,7 +9104,7 @@ int lfs_mirror_resync_file(const char *fname, struct ll_ioc_lease *ioc,
                else
                        fprintf(stderr,
                            "%s: '%s' llapi_lease_get_ext resync failed: %s.\n",
-                               progname, fname, strerror(errno));
+                               progname, fname, strerror(-rc));
                goto free_layout;
        }
 
@@ -8668,10 +9128,10 @@ int lfs_mirror_resync_file(const char *fname, struct ll_ioc_lease *ioc,
        rc = llapi_mirror_resync_many(fd, layout, comp_array, comp_size,
                                      start, end);
        if (rc < 0)
-               fprintf(stderr, "%s: '%s' llapi_mirror_resync_many: %d.\n",
-                       progname, fname, rc);
+               fprintf(stderr, "%s: '%s' llapi_mirror_resync_many: %s.\n",
+                       progname, fname, strerror(-rc));
 
-       /* prepare ioc for lease put */
+       /* need to do the lease unlock even resync fails */
        ioc->lil_mode = LL_LEASE_UNLCK;
        ioc->lil_flags = LL_LEASE_RESYNC_DONE;
        ioc->lil_count = 0;
@@ -8682,19 +9142,19 @@ int lfs_mirror_resync_file(const char *fname, struct ll_ioc_lease *ioc,
                }
        }
 
-       rc = llapi_lease_set(fd, ioc);
-       if (rc <= 0) {
-               if (rc == 0) /* lost lease lock */
-                       rc = -EBUSY;
-               fprintf(stderr, "%s: resync file '%s' failed: %s.\n",
-                       progname, fname, strerror(errno));
-               goto free_layout;
-       }
+       rc2 = llapi_lease_set(fd, ioc);
        /**
         * llapi_lease_set returns lease mode when it request to unlock
-        * the lease lock
+        * the lease lock.
         */
-       rc = 0;
+       if (rc2 <= 0) {
+               /* rc2 == 0 means lost lease lock */
+               if (rc2 == 0 && rc == 0)
+                       rc = -EBUSY;
+               fprintf(stderr, "%s: resync file '%s' failed: %s.\n",
+                       progname, fname,
+                       rc2 == 0 ? "lost lease lock" : strerror(-rc2));
+       }
 
 free_layout:
        llapi_layout_free(layout);
@@ -9205,37 +9665,6 @@ close_fd:
        return rc;
 }
 
-struct collect_ids_data {
-       __u16   *cid_ids;
-       int     cid_count;
-       __u16   cid_exclude;
-};
-
-static int collect_mirror_id(struct llapi_layout *layout, void *cbdata)
-{
-       struct collect_ids_data *cid = cbdata;
-       uint32_t id;
-       int rc;
-
-       rc = llapi_layout_mirror_id_get(layout, &id);
-       if (rc < 0)
-               return rc;
-
-       if ((__u16)id != cid->cid_exclude) {
-               int i;
-
-               for (i = 0; i < cid->cid_count; i++) {
-                       /* already collected the mirror id */
-                       if (id == cid->cid_ids[i])
-                               return LLAPI_LAYOUT_ITER_CONT;
-               }
-               cid->cid_ids[cid->cid_count] = id;
-               cid->cid_count++;
-       }
-
-       return LLAPI_LAYOUT_ITER_CONT;
-}
-
 static inline int get_other_mirror_ids(int fd, __u16 *ids, __u16 exclude_id)
 {
        struct llapi_layout *layout;
@@ -10209,14 +10638,15 @@ static int lfs_getsom(int argc, char **argv)
        switch (type) {
        case LFS_SOM_ATTR_ALL:
                printf("file: %s size: %llu blocks: %llu flags: %x\n",
-                      path, attrs->lsa_size, attrs->lsa_blocks,
+                      path, (unsigned long long)attrs->lsa_size,
+                      (unsigned long long)attrs->lsa_blocks,
                       attrs->lsa_valid);
                break;
        case LFS_SOM_SIZE:
-               printf("%llu\n", attrs->lsa_size);
+               printf("%llu\n", (unsigned long long)attrs->lsa_size);
                break;
        case LFS_SOM_BLOCKS:
-               printf("%llu\n", attrs->lsa_blocks);
+               printf("%llu\n", (unsigned long long)attrs->lsa_blocks);
                break;
        case LFS_SOM_FLAGS:
                printf("%x\n", attrs->lsa_valid);
@@ -10248,6 +10678,343 @@ static int lfs_mirror_list_commands(int argc, char **argv)
        return 0;
 }
 
+static int lfs_pcc_attach(int argc, char **argv)
+{
+       struct option long_opts[] = {
+       { .val = 'i',   .name = "id",   .has_arg = required_argument },
+       { .name = NULL } };
+       int c;
+       int rc = 0;
+       __u32 archive_id = 0;
+       const char *path;
+       char *end;
+       char fullpath[PATH_MAX];
+       enum lu_pcc_type type = LU_PCC_READWRITE;
+
+       optind = 0;
+       while ((c = getopt_long(argc, argv, "i:",
+                               long_opts, NULL)) != -1) {
+               switch (c) {
+               case 'i':
+                       archive_id = strtoul(optarg, &end, 0);
+                       if (*end != '\0' || archive_id == 0) {
+                               fprintf(stderr, "error: %s: bad archive ID "
+                                       "'%s'\n", argv[0], optarg);
+                               return CMD_HELP;
+                       }
+                       break;
+               case '?':
+                       return CMD_HELP;
+               default:
+                       fprintf(stderr, "%s: option '%s' unrecognized\n",
+                               argv[0], argv[optind - 1]);
+                       return CMD_HELP;
+               }
+       }
+
+       if (argc <= optind) {
+               fprintf(stderr, "%s: must specify one or more file names\n",
+                       argv[0]);
+               return CMD_HELP;
+       }
+
+       while (optind < argc) {
+               int rc2;
+
+               path = argv[optind++];
+               if (realpath(path, fullpath) == NULL) {
+                       fprintf(stderr, "%s: could not find path '%s': %s\n",
+                               argv[0], path, strerror(errno));
+                       if (rc == 0)
+                               rc = -EINVAL;
+                       continue;
+               }
+
+               rc2 = llapi_pcc_attach(fullpath, archive_id, type);
+               if (rc2 < 0) {
+                       fprintf(stderr, "%s: cannot attach '%s' to PCC "
+                               "with archive ID '%u': %s\n", argv[0],
+                               path, archive_id, strerror(-rc2));
+                       if (rc == 0)
+                               rc = rc2;
+               }
+       }
+       return rc;
+}
+
+static int lfs_pcc_attach_fid(int argc, char **argv)
+{
+       struct option long_opts[] = {
+       { .val = 'i',   .name = "id",   .has_arg = required_argument },
+       { .val = 'm',   .name = "mnt",  .has_arg = required_argument },
+       { .name = NULL } };
+       char                     short_opts[] = "i:m:";
+       int                      c;
+       int                      rc = 0;
+       __u32                    archive_id = 0;
+       char                    *end;
+       const char              *mntpath = NULL;
+       const char              *fidstr;
+       enum lu_pcc_type         type = LU_PCC_READWRITE;
+
+       optind = 0;
+       while ((c = getopt_long(argc, argv, short_opts,
+                               long_opts, NULL)) != -1) {
+               switch (c) {
+               case 'i':
+                       archive_id = strtoul(optarg, &end, 0);
+                       if (*end != '\0') {
+                               fprintf(stderr, "error: %s: bad archive ID "
+                                       "'%s'\n", argv[0], optarg);
+                               return CMD_HELP;
+                       }
+                       break;
+               case 'm':
+                       mntpath = optarg;
+                       break;
+               case '?':
+                       return CMD_HELP;
+               default:
+                       fprintf(stderr, "%s: option '%s' unrecognized\n",
+                               argv[0], argv[optind - 1]);
+                       return CMD_HELP;
+               }
+       }
+
+       if (archive_id == 0) {
+               fprintf(stderr, "%s: must specify an archive ID\n", argv[0]);
+               return CMD_HELP;
+       }
+
+       if (mntpath == NULL) {
+               fprintf(stderr, "%s: must specify Lustre mount point\n",
+                       argv[0]);
+               return CMD_HELP;
+       }
+
+       if (argc <= optind) {
+               fprintf(stderr, "%s: must specify one or more fids\n", argv[0]);
+               return CMD_HELP;
+       }
+
+       while (optind < argc) {
+               int rc2;
+
+               fidstr = argv[optind++];
+
+               rc2 = llapi_pcc_attach_fid_str(mntpath, fidstr,
+                                              archive_id, type);
+               if (rc2 < 0) {
+                       fprintf(stderr, "%s: cannot attach '%s' on '%s' to PCC "
+                               "with archive ID '%u': %s\n", argv[0],
+                               fidstr, mntpath, archive_id, strerror(rc2));
+               }
+               if (rc == 0 && rc2 < 0)
+                       rc = rc2;
+       }
+       return rc;
+}
+
+static int lfs_pcc_detach(int argc, char **argv)
+{
+       struct option long_opts[] = {
+       { .val = 'k',   .name = "keep", .has_arg = no_argument },
+       { .name = NULL } };
+       char                     short_opts[] = "k";
+       int                      c;
+       int                      rc = 0;
+       const char              *path;
+       char                     fullpath[PATH_MAX];
+       __u32                    detach_opt = PCC_DETACH_OPT_UNCACHE;
+
+       optind = 0;
+       while ((c = getopt_long(argc, argv, short_opts,
+                               long_opts, NULL)) != -1) {
+               switch (c) {
+               case 'k':
+                       detach_opt = PCC_DETACH_OPT_NONE;
+                       break;
+               case '?':
+                       return CMD_HELP;
+               default:
+                       fprintf(stderr, "%s: option '%s' unrecognized\n",
+                               argv[0], argv[optind - 1]);
+                       return CMD_HELP;
+               }
+       }
+
+       while (optind < argc) {
+               int rc2;
+
+               path = argv[optind++];
+               if (realpath(path, fullpath) == NULL) {
+                       fprintf(stderr, "%s: could not find path '%s': %s\n",
+                               argv[0], path, strerror(errno));
+                       if (rc == 0)
+                               rc = -EINVAL;
+                       continue;
+               }
+
+               rc2 = llapi_pcc_detach_file(fullpath, detach_opt);
+               if (rc2 < 0) {
+                       rc2 = -errno;
+                       fprintf(stderr, "%s: cannot detach '%s' from PCC: "
+                               "%s\n", argv[0], path, strerror(errno));
+                       if (rc == 0)
+                               rc = rc2;
+               }
+       }
+       return rc;
+}
+
+static int lfs_pcc_detach_fid(int argc, char **argv)
+{
+       struct option long_opts[] = {
+       { .val = 'k',   .name = "keep", .has_arg = no_argument },
+       { .name = NULL } };
+       char             short_opts[] = "k";
+       int              c;
+       int              rc = 0;
+       const char      *fid;
+       const char      *mntpath;
+       __u32            detach_opt = PCC_DETACH_OPT_UNCACHE;
+
+       optind = 0;
+       while ((c = getopt_long(argc, argv, short_opts,
+                               long_opts, NULL)) != -1) {
+               switch (c) {
+               case 'k':
+                       detach_opt = PCC_DETACH_OPT_NONE;
+                       break;
+               case '?':
+                       return CMD_HELP;
+               default:
+                       fprintf(stderr, "%s: option '%s' unrecognized\n",
+                               argv[0], argv[optind - 1]);
+                       return CMD_HELP;
+               }
+       }
+
+       mntpath = argv[optind++];
+
+       while (optind < argc) {
+               int rc2;
+
+               fid = argv[optind++];
+
+               rc2 = llapi_pcc_detach_fid_str(mntpath, fid, detach_opt);
+               if (rc2 < 0) {
+                       fprintf(stderr, "%s: cannot detach '%s' on '%s' "
+                               "from PCC: %s\n", argv[0], fid, mntpath,
+                               strerror(-rc2));
+                       if (rc == 0)
+                               rc = rc2;
+               }
+       }
+       return rc;
+}
+
+static int lfs_pcc_state(int argc, char **argv)
+{
+       int                      rc = 0;
+       const char              *path;
+       char                     fullpath[PATH_MAX];
+       struct lu_pcc_state      state;
+
+       optind = 1;
+
+       if (argc <= 1) {
+               fprintf(stderr, "%s: must specify one or more file names\n",
+                       argv[0]);
+               return CMD_HELP;
+       }
+
+       while (optind < argc) {
+               int rc2;
+
+               path = argv[optind++];
+               if (realpath(path, fullpath) == NULL) {
+                       fprintf(stderr, "%s: could not find path '%s': %s\n",
+                               argv[0], path, strerror(errno));
+                       if (rc == 0)
+                               rc = -EINVAL;
+                       continue;
+               }
+
+               rc2 = llapi_pcc_state_get(fullpath, &state);
+               if (rc2 < 0) {
+                       if (rc == 0)
+                               rc = rc2;
+                       fprintf(stderr, "%s: cannot get PCC state of '%s': "
+                               "%s\n", argv[0], path, strerror(-rc2));
+                       continue;
+               }
+
+               printf("file: %s", path);
+               printf(", type: %s", pcc_type2string(state.pccs_type));
+               if (state.pccs_type == LU_PCC_NONE &&
+                   state.pccs_open_count == 0) {
+                       printf("\n");
+                       continue;
+               }
+
+               printf(", PCC file: %s", state.pccs_path);
+               printf(", user number: %u", state.pccs_open_count);
+               printf(", flags: %x", state.pccs_flags);
+               printf("\n");
+       }
+       return rc;
+}
+
+/**
+ * lfs_pcc_list_commands() - List lfs pcc commands.
+ * @argc: The count of command line arguments.
+ * @argv: Array of strings for command line arguments.
+ *
+ * This function lists lfs pcc commands defined in pcc_cmdlist[].
+ *
+ * Return: 0 on success.
+ */
+static int lfs_pcc_list_commands(int argc, char **argv)
+{
+       char buffer[81] = "";
+
+       Parser_list_commands(pcc_cmdlist, buffer, sizeof(buffer),
+                            NULL, 0, 4);
+
+       return 0;
+}
+
+/**
+ * lfs_pcc() - Parse and execute lfs pcc commands.
+ * @argc: The count of lfs pcc command line arguments.
+ * @argv: Array of strings for lfs pcc command line arguments.
+ *
+ * This function parses lfs pcc commands and performs the
+ * corresponding functions specified in pcc_cmdlist[].
+ *
+ * Return: 0 on success or an error code on failure.
+ */
+static int lfs_pcc(int argc, char **argv)
+{
+       char cmd[PATH_MAX];
+       int rc = 0;
+
+       setlinebuf(stdout);
+
+       Parser_init("lfs-pcc > ", pcc_cmdlist);
+
+       snprintf(cmd, sizeof(cmd), "%s %s", progname, argv[0]);
+       progname = cmd;
+       program_invocation_short_name = cmd;
+       if (argc > 1)
+               rc = Parser_execarg(argc - 1, argv + 1, pcc_cmdlist);
+       else
+               rc = Parser_commands();
+
+       return rc < 0 ? -rc : rc;
+}
+
 static int lfs_list_commands(int argc, char **argv)
 {
        char buffer[81] = ""; /* 80 printable chars + terminating NUL */