2 * Copyright (c) 2015 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Antonio Huete <tuxillo@quantumachine.net>
6 * by Matthew Dillon <dillon@backplane.com>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46 #include "libhammer.h"
49 libhammer_pfs_get_snapshots(libhammer_fsinfo_t fip
, libhammer_pfsinfo_t pip
)
51 struct hammer_snapshot_data
*snapdata
= NULL
;
52 struct hammer_ioc_snapshot snap
;
53 libhammer_snapinfo_t sip
;
54 libhammer_pfsinfo_t pfs0
;
64 * Still need a path to open so, when not mounted, try
65 * to figure out the PFS path access in order to open(2)
66 * Note that this will fail for slave PFS that were created
67 * with pfs-slave directive since they don't have any transaction
68 * recorded and nlookup can't find them. For those we simply
69 * return the error in the head structure of libhammer_pfsinfo_t
70 * for the caller to handle the situation.
72 pfs0
= libhammer_get_first_pfs(fip
);
76 if (pip
->mountedon
== NULL
)
77 libhammer_pfs_canonical_path(pfs0
->mountedon
, pip
, &path
);
79 path
= strdup(pip
->mountedon
);
81 if (path
== NULL
|| (fd
= open(path
, O_RDONLY
)) < 0) {
82 pip
->head
.error
= errno
;
87 bzero(&snap
, sizeof(snap
));
90 * Loop while there are snapshots returned from the ioctl(2) call.
92 * For more information on how the snapshots are returned
93 * to userland please check sys/vfs/hammer/hammer_ioctl.c
96 if (ioctl(fd
, HAMMERIOC_GET_SNAPSHOT
, &snap
) < 0) {
97 pip
->head
.error
= errno
;
102 for (i
= 0; i
< snap
.count
; i
++) {
103 snapdata
= &snap
.snaps
[i
];
104 sip
= _libhammer_malloc(sizeof(*sip
));
105 sip
->tid
= snapdata
->tid
;
106 sip
->ts
= snapdata
->ts
;
107 if (strlen(snapdata
->label
))
108 sprintf(sip
->label
, "%s", snapdata
->label
);
110 sip
->label
[0] = '\0';
111 TAILQ_INSERT_TAIL(&pip
->list_snap
, sip
, entries
);
114 } while (snap
.head
.error
== 0 && snap
.count
);
125 libhammer_pfs_free_snapshots(libhammer_pfsinfo_t pip
)
127 struct libhammer_snapinfo
*si
;
129 while(!TAILQ_EMPTY(&pip
->list_snap
)) {
130 si
= TAILQ_FIRST(&pip
->list_snap
);
131 TAILQ_REMOVE(&pip
->list_snap
, si
, entries
);