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libzfs_sendrecv: Style pass on send_iterate_fs

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* Capitalize and punctuate complete sentences in comments.
* Separate out a group of locals to add a comment on their purpose.
* Remove unnecessary line wrapping.
* Make it clear that dds_origin is a string by using explicit character
  comparison to check for an empty string, rather than implictly
  treating it as a boolean.
* Reorganize manipulation of props and holds nvlists to improve
  clarity.
* There's no need to initialize the snapname buffer with zeros, we're
  immediately overwriting it.

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 16:20:15 +00:00 committed by Brian Behlendorf
parent 2b6b7111f4
commit 0c1c746a74
1 changed files with 34 additions and 34 deletions
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68
lib/libzfs/libzfs_sendrecv.c
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@ -460,7 +460,7 @@ get_snap_txg(libzfs_handle_t *hdl, const char *fs, const char *snap)
} }
/* /*
* recursively generate nvlists describing datasets. See comment * Recursively generate nvlists describing datasets. See comment
* for the data structure send_data_t above for description of contents * for the data structure send_data_t above for description of contents
* of the nvlist. * of the nvlist.
*/ */
@ -471,14 +471,16 @@ send_iterate_fs(zfs_handle_t *zhp, void *arg)
nvlist_t *nvfs = NULL, *nv = NULL; nvlist_t *nvfs = NULL, *nv = NULL;
int rv = 0; int rv = 0;
uint64_t min_txg = 0, max_txg = 0; uint64_t min_txg = 0, max_txg = 0;
uint64_t parent_fromsnap_guid_save = sd->parent_fromsnap_guid;
uint64_t fromsnap_txg_save = sd->fromsnap_txg;
uint64_t tosnap_txg_save = sd->tosnap_txg;
uint64_t txg = zhp->zfs_dmustats.dds_creation_txg; uint64_t txg = zhp->zfs_dmustats.dds_creation_txg;
uint64_t guid = zhp->zfs_dmustats.dds_guid; uint64_t guid = zhp->zfs_dmustats.dds_guid;
uint64_t fromsnap_txg, tosnap_txg; uint64_t fromsnap_txg, tosnap_txg;
char guidstring[64]; char guidstring[64];
/* These fields are restored on return from a recursive call. */
uint64_t parent_fromsnap_guid_save = sd->parent_fromsnap_guid;
uint64_t fromsnap_txg_save = sd->fromsnap_txg;
uint64_t tosnap_txg_save = sd->tosnap_txg;
fromsnap_txg = get_snap_txg(zhp->zfs_hdl, zhp->zfs_name, sd->fromsnap); fromsnap_txg = get_snap_txg(zhp->zfs_hdl, zhp->zfs_name, sd->fromsnap);
if (fromsnap_txg != 0) if (fromsnap_txg != 0)
sd->fromsnap_txg = fromsnap_txg; sd->fromsnap_txg = fromsnap_txg;
@ -488,14 +490,14 @@ send_iterate_fs(zfs_handle_t *zhp, void *arg)
sd->tosnap_txg = tosnap_txg; sd->tosnap_txg = tosnap_txg;
/* /*
* on the send side, if the current dataset does not have tosnap, * On the send side, if the current dataset does not have tosnap,
* perform two additional checks: * perform two additional checks:
* *
* - skip sending the current dataset if it was created later than * - Skip sending the current dataset if it was created later than
* the parent tosnap * the parent tosnap.
* - return error if the current dataset was created earlier than * - Return error if the current dataset was created earlier than
* the parent tosnap, unless --skip-missing specified. Then * the parent tosnap, unless --skip-missing specified. Then
* just print a warning * just print a warning.
*/ */
if (sd->tosnap != NULL && tosnap_txg == 0) { if (sd->tosnap != NULL && tosnap_txg == 0) {
if (sd->tosnap_txg != 0 && txg > sd->tosnap_txg) { if (sd->tosnap_txg != 0 && txg > sd->tosnap_txg) {
@ -522,10 +524,9 @@ send_iterate_fs(zfs_handle_t *zhp, void *arg)
nvfs = fnvlist_alloc(); nvfs = fnvlist_alloc();
fnvlist_add_string(nvfs, "name", zhp->zfs_name); fnvlist_add_string(nvfs, "name", zhp->zfs_name);
fnvlist_add_uint64(nvfs, "parentfromsnap", fnvlist_add_uint64(nvfs, "parentfromsnap", sd->parent_fromsnap_guid);
sd->parent_fromsnap_guid);
if (zhp->zfs_dmustats.dds_origin[0]) { if (zhp->zfs_dmustats.dds_origin[0] != '\0') {
zfs_handle_t *origin = zfs_open(zhp->zfs_hdl, zfs_handle_t *origin = zfs_open(zhp->zfs_hdl,
zhp->zfs_dmustats.dds_origin, ZFS_TYPE_SNAPSHOT); zhp->zfs_dmustats.dds_origin, ZFS_TYPE_SNAPSHOT);
if (origin == NULL) { if (origin == NULL) {
@ -534,19 +535,19 @@ send_iterate_fs(zfs_handle_t *zhp, void *arg)
} }
fnvlist_add_uint64(nvfs, "origin", fnvlist_add_uint64(nvfs, "origin",
origin->zfs_dmustats.dds_guid); origin->zfs_dmustats.dds_guid);
zfs_close(origin); zfs_close(origin);
} }
/* iterate over props */ /* Iterate over props. */
if (sd->props || sd->backup || sd->recursive) { if (sd->props || sd->backup || sd->recursive) {
nv = fnvlist_alloc(); nv = fnvlist_alloc();
send_iterate_prop(zhp, sd->backup, nv); send_iterate_prop(zhp, sd->backup, nv);
fnvlist_add_nvlist(nvfs, "props", nv);
} }
if (zfs_prop_get_int(zhp, ZFS_PROP_ENCRYPTION) != ZIO_CRYPT_OFF) { if (zfs_prop_get_int(zhp, ZFS_PROP_ENCRYPTION) != ZIO_CRYPT_OFF) {
boolean_t encroot; boolean_t encroot;
/* determine if this dataset is an encryption root */ /* Determine if this dataset is an encryption root. */
if (zfs_crypto_get_encryption_root(zhp, &encroot, NULL) != 0) { if (zfs_crypto_get_encryption_root(zhp, &encroot, NULL) != 0) {
rv = -1; rv = -1;
goto out; goto out;
@ -572,22 +573,19 @@ send_iterate_fs(zfs_handle_t *zhp, void *arg)
} }
if (nv != NULL)
fnvlist_add_nvlist(nvfs, "props", nv);
/* iterate over snaps, and set sd->parent_fromsnap_guid */
sd->parent_fromsnap_guid = 0;
sd->parent_snaps = fnvlist_alloc();
sd->snapprops = fnvlist_alloc();
if (sd->holds)
sd->snapholds = fnvlist_alloc();
/* /*
* Iterate over snaps, and set sd->parent_fromsnap_guid.
*
* If this is a "doall" send, a replicate send or we're just trying * If this is a "doall" send, a replicate send or we're just trying
* to gather a list of previous snapshots, iterate through all the * to gather a list of previous snapshots, iterate through all the
* snaps in the txg range. Otherwise just look at the one we're * snaps in the txg range. Otherwise just look at the one we're
* interested in. * interested in.
*/ */
sd->parent_fromsnap_guid = 0;
sd->parent_snaps = fnvlist_alloc();
sd->snapprops = fnvlist_alloc();
if (sd->holds)
sd->snapholds = fnvlist_alloc();
if (sd->doall || sd->replicate || sd->tosnap == NULL) { if (sd->doall || sd->replicate || sd->tosnap == NULL) {
if (!sd->replicate && fromsnap_txg != 0) if (!sd->replicate && fromsnap_txg != 0)
min_txg = fromsnap_txg; min_txg = fromsnap_txg;
@ -596,26 +594,26 @@ send_iterate_fs(zfs_handle_t *zhp, void *arg)
(void) zfs_iter_snapshots_sorted(zhp, send_iterate_snap, sd, (void) zfs_iter_snapshots_sorted(zhp, send_iterate_snap, sd,
min_txg, max_txg); min_txg, max_txg);
} else { } else {
char snapname[MAXPATHLEN] = { 0 }; char snapname[MAXPATHLEN];
zfs_handle_t *snap; zfs_handle_t *snap;
(void) snprintf(snapname, sizeof (snapname), "%s@%s", (void) snprintf(snapname, sizeof (snapname), "%s@%s",
zhp->zfs_name, sd->tosnap); zhp->zfs_name, sd->tosnap);
if (sd->fromsnap != NULL) if (sd->fromsnap != NULL)
sd->seenfrom = B_TRUE; sd->seenfrom = B_TRUE;
snap = zfs_open(zhp->zfs_hdl, snapname, snap = zfs_open(zhp->zfs_hdl, snapname, ZFS_TYPE_SNAPSHOT);
ZFS_TYPE_SNAPSHOT);
if (snap != NULL) if (snap != NULL)
(void) send_iterate_snap(snap, sd); (void) send_iterate_snap(snap, sd);
} }
fnvlist_add_nvlist(nvfs, "snaps", sd->parent_snaps); fnvlist_add_nvlist(nvfs, "snaps", sd->parent_snaps);
fnvlist_add_nvlist(nvfs, "snapprops", sd->snapprops);
if (sd->holds)
fnvlist_add_nvlist(nvfs, "snapholds", sd->snapholds);
fnvlist_free(sd->parent_snaps); fnvlist_free(sd->parent_snaps);
fnvlist_add_nvlist(nvfs, "snapprops", sd->snapprops);
fnvlist_free(sd->snapprops); fnvlist_free(sd->snapprops);
fnvlist_free(sd->snapholds); if (sd->holds) {
fnvlist_add_nvlist(nvfs, "snapholds", sd->snapholds);
fnvlist_free(sd->snapholds);
}
/* Do not allow the size of the properties list to exceed the limit */ /* Do not allow the size of the properties list to exceed the limit */
if ((fnvlist_size(nvfs) + fnvlist_size(sd->fss)) > if ((fnvlist_size(nvfs) + fnvlist_size(sd->fss)) >
@ -629,19 +627,21 @@ send_iterate_fs(zfs_handle_t *zhp, void *arg)
rv = EZFS_NOSPC; rv = EZFS_NOSPC;
goto out; goto out;
} }
/* add this fs to nvlist */ /* Add this fs to nvlist. */
(void) snprintf(guidstring, sizeof (guidstring), (void) snprintf(guidstring, sizeof (guidstring),
"0x%llx", (longlong_t)guid); "0x%llx", (longlong_t)guid);
fnvlist_add_nvlist(sd->fss, guidstring, nvfs); fnvlist_add_nvlist(sd->fss, guidstring, nvfs);
/* iterate over children */ /* Iterate over children. */
if (sd->recursive) if (sd->recursive)
rv = zfs_iter_filesystems(zhp, send_iterate_fs, sd); rv = zfs_iter_filesystems(zhp, send_iterate_fs, sd);
out: out:
/* Restore saved fields. */
sd->parent_fromsnap_guid = parent_fromsnap_guid_save; sd->parent_fromsnap_guid = parent_fromsnap_guid_save;
sd->fromsnap_txg = fromsnap_txg_save; sd->fromsnap_txg = fromsnap_txg_save;
sd->tosnap_txg = tosnap_txg_save; sd->tosnap_txg = tosnap_txg_save;
fnvlist_free(nv); fnvlist_free(nv);
fnvlist_free(nvfs); fnvlist_free(nvfs);