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libzfs_sendrecv: Style pass on send_iterate_snap 

* Add a high level comment.
* Use local variables to reduce line wrapping.
* Remove extra braces and insert space for clarity.
* Assert precondition that the dataset name contains '@' for sanity.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Moeller <freqlabs@FreeBSD.org>
Closes #12967
This commit is contained in:
Ryan Moeller 2021-07-27 13:49:59 +00:00 committed by Brian Behlendorf
parent f2b36b2db0
commit dd59c422d3
1 changed files with 18 additions and 14 deletions
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32
lib/libzfs/libzfs_sendrecv.c
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@ -283,51 +283,54 @@ typedef struct send_data {
static void
send_iterate_prop(zfs_handle_t *zhp, boolean_t received_only, nvlist_t *nv);
/*
* Collect guid, valid props, optionally holds, etc. of a snapshot.
* This interface is intended for use as a zfs_iter_snapshots_sorted visitor.
*/
static int
send_iterate_snap(zfs_handle_t *zhp, void *arg)
{
send_data_t *sd = arg;
uint64_t guid = zhp->zfs_dmustats.dds_guid;
uint64_t txg = zhp->zfs_dmustats.dds_creation_txg;
char *snapname;
nvlist_t *nv;
boolean_t isfromsnap, istosnap, istosnapwithnofrom;
char *snapname = strrchr(zhp->zfs_name, '@') + 1;
const char *from = sd->fromsnap;
const char *to = sd->tosnap;
snapname = strrchr(zhp->zfs_name, '@')+1;
isfromsnap = (sd->fromsnap != NULL &&
strcmp(sd->fromsnap, snapname) == 0);
istosnap = (sd->tosnap != NULL && (strcmp(sd->tosnap, snapname) == 0));
istosnapwithnofrom = (istosnap && sd->fromsnap == NULL);
assert(snapname != (NULL + 1));
isfromsnap = (from != NULL && strcmp(from, snapname) == 0);
istosnap = (to != NULL && strcmp(to, snapname) == 0);
istosnapwithnofrom = (istosnap && from == NULL);
if (sd->tosnap_txg != 0 && txg > sd->tosnap_txg) {
if (sd->verbose) {
(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
"skipping snapshot %s because it was created "
"after the destination snapshot (%s)\n"),
zhp->zfs_name, sd->tosnap);
zhp->zfs_name, to);
}
zfs_close(zhp);
return (0);
}
fnvlist_add_uint64(sd->parent_snaps, snapname, guid);
/*
* NB: if there is no fromsnap here (it's a newly created fs in
* an incremental replication), we will substitute the tosnap.
*/
if (isfromsnap || (sd->parent_fromsnap_guid == 0 && istosnap)) {
if (isfromsnap || (sd->parent_fromsnap_guid == 0 && istosnap))
sd->parent_fromsnap_guid = guid;
}
if (!sd->recursive) {
/*
* To allow a doall stream to work properly
* with a NULL fromsnap
*/
if (sd->doall && sd->fromsnap == NULL && !sd->seenfrom) {
if (sd->doall && from == NULL && !sd->seenfrom)
sd->seenfrom = B_TRUE;
}
if (!sd->seenfrom && isfromsnap) {
sd->seenfrom = B_TRUE;
@ -344,10 +347,11 @@ send_iterate_snap(zfs_handle_t *zhp, void *arg)
sd->seento = B_TRUE;
}
nv = fnvlist_alloc();
nvlist_t *nv = fnvlist_alloc();
send_iterate_prop(zhp, sd->backup, nv);
fnvlist_add_nvlist(sd->snapprops, snapname, nv);
fnvlist_free(nv);
if (sd->holds) {
nvlist_t *holds;
if (lzc_get_holds(zhp->zfs_name, &holds) == 0) {