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OpenZFS 6051 - lzc_receive: allow the caller to read the begin record

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Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>

OpenZFS-issue: https://www.illumos.org/issues/6051
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/620f322
This commit is contained in:
Brian Behlendorf 2016-06-16 10:01:33 -07:00
parent 47dfff3b86
commit fd41e93563
2 changed files with 41 additions and 8 deletions
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7
include/libzfs_core.h
View File

@ -60,10 +60,15 @@ enum lzc_send_flags {
int lzc_send(const char *, const char *, int, enum lzc_send_flags);
int lzc_send_resume(const char *, const char *, int,
enum lzc_send_flags, uint64_t, uint64_t);
int lzc_send_space(const char *, const char *, uint64_t *);
struct dmu_replay_record;
int lzc_receive(const char *, nvlist_t *, const char *, boolean_t, int);
int lzc_receive_resumable(const char *, nvlist_t *, const char *,
boolean_t, int);
int lzc_send_space(const char *, const char *, uint64_t *);
int lzc_receive_with_header(const char *, nvlist_t *, const char *, boolean_t,
boolean_t, int, const struct dmu_replay_record *);
boolean_t lzc_exists(const char *);

42
lib/libzfs_core/libzfs_core.c
View File

@ -548,8 +548,9 @@ recv_read(int fd, void *buf, int ilen)
}
static int
lzc_receive_impl(const char *snapname, nvlist_t *props, const char *origin,
boolean_t force, boolean_t resumable, int fd)
recv_impl(const char *snapname, nvlist_t *props, const char *origin,
boolean_t force, boolean_t resumable, int fd,
const dmu_replay_record_t *begin_record)
{
/*
* The receive ioctl is still legacy, so we need to construct our own
@ -594,9 +595,14 @@ lzc_receive_impl(const char *snapname, nvlist_t *props, const char *origin,
(void) strlcpy(zc.zc_string, origin, sizeof (zc.zc_string));
/* zc_begin_record is non-byteswapped BEGIN record */
error = recv_read(fd, &zc.zc_begin_record, sizeof (zc.zc_begin_record));
if (error != 0)
goto out;
if (begin_record == NULL) {
error = recv_read(fd, &zc.zc_begin_record,
sizeof (zc.zc_begin_record));
if (error != 0)
goto out;
} else {
zc.zc_begin_record = *begin_record;
}
/* zc_cookie is fd to read from */
zc.zc_cookie = fd;
@ -637,7 +643,7 @@ int
lzc_receive(const char *snapname, nvlist_t *props, const char *origin,
boolean_t force, int fd)
{
return (lzc_receive_impl(snapname, props, origin, force, B_FALSE, fd));
return (recv_impl(snapname, props, origin, force, B_FALSE, fd, NULL));
}
/*
@ -650,7 +656,29 @@ int
lzc_receive_resumable(const char *snapname, nvlist_t *props, const char *origin,
boolean_t force, int fd)
{
return (lzc_receive_impl(snapname, props, origin, force, B_TRUE, fd));
return (recv_impl(snapname, props, origin, force, B_TRUE, fd, NULL));
}
/*
* Like lzc_receive, but allows the caller to read the begin record and then to
* pass it in. That could be useful if the caller wants to derive, for example,
* the snapname or the origin parameters based on the information contained in
* the begin record.
* The begin record must be in its original form as read from the stream,
* in other words, it should not be byteswapped.
*
* The 'resumable' parameter allows to obtain the same behavior as with
* lzc_receive_resumable.
*/
int
lzc_receive_with_header(const char *snapname, nvlist_t *props,
const char *origin, boolean_t force, boolean_t resumable, int fd,
const dmu_replay_record_t *begin_record)
{
if (begin_record == NULL)
return (EINVAL);
return (recv_impl(snapname, props, origin, force, resumable, fd,
begin_record));
}
/*