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man: zfs-send.8: fix -X synopses and description
Also clean up the horrendously verbose -X handling in zfs_main() Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #13352
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Brian Behlendorf
parent
7eba3891e9
commit
6625262c70
@ -315,9 +315,9 @@ get_usage(zfs_help_t idx)
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case HELP_ROLLBACK:
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return (gettext("\trollback [-rRf] <snapshot>\n"));
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case HELP_SEND:
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return (gettext("\tsend [-DnPpRvLecwhb] "
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"[-X dataset[,dataset]...] "
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"[-[i|I] snapshot] <snapshot>\n"
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return (gettext("\tsend [-DLPbcehnpsvw] "
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"[-i|-I snapshot]\n"
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"\t [-R [-X dataset[,dataset]...]] <snapshot>\n"
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"\tsend [-DnvPLecw] [-i snapshot|bookmark] "
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"<filesystem|volume|snapshot>\n"
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"\tsend [-DnPpvLec] [-i bookmark|snapshot] "
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@ -4315,74 +4315,28 @@ usage:
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return (-1);
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}
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/*
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* Array of prefixes to exclude –
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* a linear search, even if executed for each dataset,
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* is plenty good enough.
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*/
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typedef struct zfs_send_exclude_arg {
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size_t count;
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char **list;
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const char **list;
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} zfs_send_exclude_arg_t;
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/*
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* This function creates the zfs_send_exclude_arg_t
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* object described above; it can be called multiple
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* times, and the input can be comma-separated.
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* This is NOT the most efficient data layout; however,
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* I couldn't think of a non-pathological case where
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* it should have more than a couple dozen instances
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* of excludes. If that turns out to be used in
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* practice, we might want to instead use a tree.
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*/
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static void
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add_dataset_excludes(char *exclude, zfs_send_exclude_arg_t *context)
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{
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char *tok;
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while ((tok = strsep(&exclude, ",")) != NULL) {
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if (!zfs_name_valid(tok, ZFS_TYPE_DATASET) ||
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strchr(tok, '/') == NULL) {
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(void) fprintf(stderr, gettext("-X %s: "
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"not a valid non-root dataset name.\n"), tok);
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usage(B_FALSE);
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}
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context->list = safe_realloc(context->list,
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(sizeof (char *)) * (context->count + 1));
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context->list[context->count++] = tok;
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}
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}
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static void
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free_dataset_excludes(zfs_send_exclude_arg_t *exclude_list)
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{
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free(exclude_list->list);
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}
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/*
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* This is the call back used by zfs_send to
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* determine if a dataset should be skipped.
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* As stated above, this is not the most efficient
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* data structure to use, but as long as the
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* number of excluded datasets is relatively
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* small (a couple of dozen or so), it won't
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* have a big impact on performance on modern
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* processors. Since it's excluding hierarchies,
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* we'd probably want to move to a more complex
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* tree structure in that case.
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*/
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static boolean_t
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zfs_do_send_exclude(zfs_handle_t *zhp, void *context)
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{
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zfs_send_exclude_arg_t *exclude = context;
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zfs_send_exclude_arg_t *excludes = context;
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const char *name = zfs_get_name(zhp);
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for (size_t indx = 0; indx < exclude->count; indx++) {
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char *exclude_name = exclude->list[indx];
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size_t len = strlen(exclude_name);
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/* If it's shorter, it can't possibly match */
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if (strlen(name) < len)
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continue;
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if (strncmp(name, exclude_name, len) == 0 &&
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(name[len] == '/' || name[len] == '\0' ||
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name[len] == '@')) {
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for (size_t i = 0; i < excludes->count; ++i) {
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size_t len = strlen(excludes->list[i]);
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if (strncmp(name, excludes->list[i], len) == 0 &&
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memchr("/@", name[len], sizeof ("/@")))
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return (B_FALSE);
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}
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}
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return (B_TRUE);
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}
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@ -4402,7 +4356,7 @@ zfs_do_send(int argc, char **argv)
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int c, err;
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nvlist_t *dbgnv = NULL;
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char *redactbook = NULL;
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zfs_send_exclude_arg_t exclude_context = { 0 };
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zfs_send_exclude_arg_t excludes = { 0 };
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struct option long_options[] = {
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{"replicate", no_argument, NULL, 'R'},
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@ -4430,7 +4384,18 @@ zfs_do_send(int argc, char **argv)
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long_options, NULL)) != -1) {
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switch (c) {
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case 'X':
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add_dataset_excludes(optarg, &exclude_context);
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for (char *ds; (ds = strsep(&optarg, ",")) != NULL; ) {
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if (!zfs_name_valid(ds, ZFS_TYPE_DATASET) ||
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strchr(ds, '/') == NULL) {
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(void) fprintf(stderr, gettext("-X %s: "
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"not a valid non-root dataset name"
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".\n"), ds);
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usage(B_FALSE);
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}
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excludes.list = safe_realloc(excludes.list,
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sizeof (char *) * (excludes.count + 1));
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excludes.list[excludes.count++] = ds;
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}
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break;
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case 'i':
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if (fromname)
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@ -4541,7 +4506,7 @@ zfs_do_send(int argc, char **argv)
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if (flags.parsable && flags.verbosity == 0)
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flags.verbosity = 1;
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if (exclude_context.count > 0 && !flags.replicate) {
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if (excludes.count > 0 && !flags.replicate) {
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(void) fprintf(stderr, gettext("Cannot specify "
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"dataset exclusion (-X) on a non-recursive "
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"send.\n"));
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@ -4730,10 +4695,8 @@ zfs_do_send(int argc, char **argv)
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flags.doall = B_TRUE;
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err = zfs_send(zhp, fromname, toname, &flags, STDOUT_FILENO,
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exclude_context.count > 0 ? zfs_do_send_exclude : NULL,
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&exclude_context, flags.verbosity >= 3 ? &dbgnv : NULL);
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free_dataset_excludes(&exclude_context);
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excludes.count > 0 ? zfs_do_send_exclude : NULL,
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&excludes, flags.verbosity >= 3 ? &dbgnv : NULL);
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if (flags.verbosity >= 3 && dbgnv != NULL) {
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/*
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@ -4745,8 +4708,9 @@ zfs_do_send(int argc, char **argv)
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dump_nvlist(dbgnv, 0);
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nvlist_free(dbgnv);
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}
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zfs_close(zhp);
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zfs_close(zhp);
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free(excludes.list);
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return (err != 0);
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}
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@ -39,8 +39,8 @@
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.Sh SYNOPSIS
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.Nm zfs
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.Cm send
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.Op Fl DLPRbcehnpsvw
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.Op Fl X Ar dataset Ns Oo , Ns Ar dataset Oc Ns …
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.Op Fl DLPbcehnpsvw
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.Op Fl R Op Fl X Ar dataset Ns Oo , Ns Ar dataset Oc Ns …
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.Op Oo Fl I Ns | Ns Fl i Oc Ar snapshot
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.Ar snapshot
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.Nm zfs
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@ -73,8 +73,8 @@
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.It Xo
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.Nm zfs
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.Cm send
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.Op Fl DLPRbcehnpvw
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.Op Fl X Ar dataset Ns Oo , Ns Ar dataset Oc Ns …
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.Op Fl DLPbcehnpsvw
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.Op Fl R Op Fl X Ar dataset Ns Oo , Ns Ar dataset Oc Ns …
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.Op Oo Fl I Ns | Ns Fl i Oc Ar snapshot
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.Ar snapshot
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.Xc
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@ -143,22 +143,15 @@ flag is used to send encrypted datasets, then
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.Fl w
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must also be specified.
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.It Fl X , -exclude Ar dataset Ns Oo , Ns Ar dataset Oc Ns …
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When the
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.Fl R
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flag is given,
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With
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.Fl R ,
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.Fl X
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can be used to specify a list of datasets to be excluded from the
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data stream.
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The
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.Fl X
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option can be used multiple times, or the list of datasets can be
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specified as a comma-separated list, or both.
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.Ar dataset
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must not be the pool's root dataset, and all descendant datasets of
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.Ar dataset
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will be excluded from the send stream.
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Requires
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.Fl R .
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specifies a set of datasets (and, hence, their descendants),
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to be excluded from the send stream.
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The root dataset may not be excluded.
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.Fl X Ar a Fl X Ar b
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is equivalent to
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.Fl X Ar a , Ns Ar b .
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.It Fl e , -embed
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Generate a more compact stream by using
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.Sy WRITE_EMBEDDED
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