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authorMatt Macy <mmacy@FreeBSD.org>2020-08-25 02:21:27 +0000
committerMatt Macy <mmacy@FreeBSD.org>2020-08-25 02:21:27 +0000
commit9e5787d2284e187abb5b654d924394a65772e004 (patch)
tree2ebf833af6b1953d4a683e2da830fe87bf3435e1 /cddl/contrib/opensolaris/lib/libzfs/common/libzfs_diff.c
parent22df1ffd812f0395cdb7c0b1edae1f67b991562a (diff)
downloadsrc-9e5787d2284e187abb5b654d924394a65772e004.tar.gz
src-9e5787d2284e187abb5b654d924394a65772e004.zip
Merge OpenZFS support in to HEAD.
The primary benefit is maintaining a completely shared code base with the community allowing FreeBSD to receive new features sooner and with less effort. I would advise against doing 'zpool upgrade' or creating indispensable pools using new features until this change has had a month+ to soak. Work on merging FreeBSD support in to what was at the time "ZFS on Linux" began in August 2018. I first publicly proposed transitioning FreeBSD to (new) OpenZFS on December 18th, 2018. FreeBSD support in OpenZFS was finally completed in December 2019. A CFT for downstreaming OpenZFS support in to FreeBSD was first issued on July 8th. All issues that were reported have been addressed or, for a couple of less critical matters there are pull requests in progress with OpenZFS. iXsystems has tested and dogfooded extensively internally. The TrueNAS 12 release is based on OpenZFS with some additional features that have not yet made it upstream. Improvements include: project quotas, encrypted datasets, allocation classes, vectorized raidz, vectorized checksums, various command line improvements, zstd compression. Thanks to those who have helped along the way: Ryan Moeller, Allan Jude, Zack Welch, and many others. Sponsored by: iXsystems, Inc. Differential Revision: https://reviews.freebsd.org/D25872
Notes
Notes: svn path=/head/; revision=364746
Diffstat (limited to 'cddl/contrib/opensolaris/lib/libzfs/common/libzfs_diff.c')
-rw-r--r--cddl/contrib/opensolaris/lib/libzfs/common/libzfs_diff.c834
1 files changed, 0 insertions, 834 deletions
diff --git a/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_diff.c b/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_diff.c
deleted file mode 100644
index db132190154c..000000000000
--- a/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_diff.c
+++ /dev/null
@@ -1,834 +0,0 @@
-/*
- * CDDL HEADER START
- *
- * The contents of this file are subject to the terms of the
- * Common Development and Distribution License (the "License").
- * You may not use this file except in compliance with the License.
- *
- * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
- * or http://www.opensolaris.org/os/licensing.
- * See the License for the specific language governing permissions
- * and limitations under the License.
- *
- * When distributing Covered Code, include this CDDL HEADER in each
- * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
- * If applicable, add the following below this CDDL HEADER, with the
- * fields enclosed by brackets "[]" replaced with your own identifying
- * information: Portions Copyright [yyyy] [name of copyright owner]
- *
- * CDDL HEADER END
- */
-
-/*
- * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
- * Copyright (c) 2015, 2018 by Delphix. All rights reserved.
- * Copyright 2016 Joyent, Inc.
- * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
- */
-
-/*
- * zfs diff support
- */
-#include <ctype.h>
-#include <errno.h>
-#include <libintl.h>
-#include <string.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <stddef.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <pthread.h>
-#include <sys/zfs_ioctl.h>
-#include <libzfs.h>
-#include "libzfs_impl.h"
-
-#define ZDIFF_SNAPDIR "/.zfs/snapshot/"
-#define ZDIFF_SHARESDIR "/.zfs/shares/"
-#define ZDIFF_PREFIX "zfs-diff-%d"
-
-#define ZDIFF_ADDED '+'
-#define ZDIFF_MODIFIED 'M'
-#define ZDIFF_REMOVED '-'
-#define ZDIFF_RENAMED 'R'
-
-typedef struct differ_info {
- zfs_handle_t *zhp;
- char *fromsnap;
- char *frommnt;
- char *tosnap;
- char *tomnt;
- char *ds;
- char *dsmnt;
- char *tmpsnap;
- char errbuf[1024];
- boolean_t isclone;
- boolean_t scripted;
- boolean_t classify;
- boolean_t timestamped;
- uint64_t shares;
- int zerr;
- int cleanupfd;
- int outputfd;
- int datafd;
-} differ_info_t;
-
-/*
- * Given a {dsname, object id}, get the object path
- */
-static int
-get_stats_for_obj(differ_info_t *di, const char *dsname, uint64_t obj,
- char *pn, int maxlen, zfs_stat_t *sb)
-{
- zfs_cmd_t zc = { 0 };
- int error;
-
- (void) strlcpy(zc.zc_name, dsname, sizeof (zc.zc_name));
- zc.zc_obj = obj;
-
- errno = 0;
- error = ioctl(di->zhp->zfs_hdl->libzfs_fd, ZFS_IOC_OBJ_TO_STATS, &zc);
- di->zerr = errno;
-
- /* we can get stats even if we failed to get a path */
- (void) memcpy(sb, &zc.zc_stat, sizeof (zfs_stat_t));
- if (error == 0) {
- ASSERT(di->zerr == 0);
- (void) strlcpy(pn, zc.zc_value, maxlen);
- return (0);
- }
-
- if (di->zerr == ESTALE) {
- (void) snprintf(pn, maxlen, "(on_delete_queue)");
- return (0);
- } else if (di->zerr == EPERM) {
- (void) snprintf(di->errbuf, sizeof (di->errbuf),
- dgettext(TEXT_DOMAIN,
- "The sys_config privilege or diff delegated permission "
- "is needed\nto discover path names"));
- return (-1);
- } else {
- (void) snprintf(di->errbuf, sizeof (di->errbuf),
- dgettext(TEXT_DOMAIN,
- "Unable to determine path or stats for "
- "object %jd in %s"), (uintmax_t)obj, dsname);
- return (-1);
- }
-}
-
-/*
- * stream_bytes
- *
- * Prints a file name out a character at a time. If the character is
- * not in the range of what we consider "printable" ASCII, display it
- * as an escaped 3-digit octal value. ASCII values less than a space
- * are all control characters and we declare the upper end as the
- * DELete character. This also is the last 7-bit ASCII character.
- * We choose to treat all 8-bit ASCII as not printable for this
- * application.
- */
-static void
-stream_bytes(FILE *fp, const char *string)
-{
- char c;
-
- while ((c = *string++) != '\0') {
- if (c > ' ' && c != '\\' && c < '\177') {
- (void) fprintf(fp, "%c", c);
- } else {
- (void) fprintf(fp, "\\%03o", (uint8_t)c);
- }
- }
-}
-
-static void
-print_what(FILE *fp, mode_t what)
-{
- char symbol;
-
- switch (what & S_IFMT) {
- case S_IFBLK:
- symbol = 'B';
- break;
- case S_IFCHR:
- symbol = 'C';
- break;
- case S_IFDIR:
- symbol = '/';
- break;
-#ifdef S_IFDOOR
- case S_IFDOOR:
- symbol = '>';
- break;
-#endif
- case S_IFIFO:
- symbol = '|';
- break;
- case S_IFLNK:
- symbol = '@';
- break;
-#ifdef S_IFPORT
- case S_IFPORT:
- symbol = 'P';
- break;
-#endif
- case S_IFSOCK:
- symbol = '=';
- break;
- case S_IFREG:
- symbol = 'F';
- break;
- default:
- symbol = '?';
- break;
- }
- (void) fprintf(fp, "%c", symbol);
-}
-
-static void
-print_cmn(FILE *fp, differ_info_t *di, const char *file)
-{
- stream_bytes(fp, di->dsmnt);
- stream_bytes(fp, file);
-}
-
-static void
-print_rename(FILE *fp, differ_info_t *di, const char *old, const char *new,
- zfs_stat_t *isb)
-{
- if (di->timestamped)
- (void) fprintf(fp, "%10lld.%09lld\t",
- (longlong_t)isb->zs_ctime[0],
- (longlong_t)isb->zs_ctime[1]);
- (void) fprintf(fp, "%c\t", ZDIFF_RENAMED);
- if (di->classify) {
- print_what(fp, isb->zs_mode);
- (void) fprintf(fp, "\t");
- }
- print_cmn(fp, di, old);
- if (di->scripted)
- (void) fprintf(fp, "\t");
- else
- (void) fprintf(fp, " -> ");
- print_cmn(fp, di, new);
- (void) fprintf(fp, "\n");
-}
-
-static void
-print_link_change(FILE *fp, differ_info_t *di, int delta, const char *file,
- zfs_stat_t *isb)
-{
- if (di->timestamped)
- (void) fprintf(fp, "%10lld.%09lld\t",
- (longlong_t)isb->zs_ctime[0],
- (longlong_t)isb->zs_ctime[1]);
- (void) fprintf(fp, "%c\t", ZDIFF_MODIFIED);
- if (di->classify) {
- print_what(fp, isb->zs_mode);
- (void) fprintf(fp, "\t");
- }
- print_cmn(fp, di, file);
- (void) fprintf(fp, "\t(%+d)", delta);
- (void) fprintf(fp, "\n");
-}
-
-static void
-print_file(FILE *fp, differ_info_t *di, char type, const char *file,
- zfs_stat_t *isb)
-{
- if (di->timestamped)
- (void) fprintf(fp, "%10lld.%09lld\t",
- (longlong_t)isb->zs_ctime[0],
- (longlong_t)isb->zs_ctime[1]);
- (void) fprintf(fp, "%c\t", type);
- if (di->classify) {
- print_what(fp, isb->zs_mode);
- (void) fprintf(fp, "\t");
- }
- print_cmn(fp, di, file);
- (void) fprintf(fp, "\n");
-}
-
-static int
-write_inuse_diffs_one(FILE *fp, differ_info_t *di, uint64_t dobj)
-{
- struct zfs_stat fsb, tsb;
- mode_t fmode, tmode;
- char fobjname[MAXPATHLEN], tobjname[MAXPATHLEN];
- int fobjerr, tobjerr;
- int change;
-
- if (dobj == di->shares)
- return (0);
-
- /*
- * Check the from and to snapshots for info on the object. If
- * we get ENOENT, then the object just didn't exist in that
- * snapshot. If we get ENOTSUP, then we tried to get
- * info on a non-ZPL object, which we don't care about anyway.
- */
- fobjerr = get_stats_for_obj(di, di->fromsnap, dobj, fobjname,
- MAXPATHLEN, &fsb);
- if (fobjerr && di->zerr != ENOENT && di->zerr != ENOTSUP)
- return (-1);
-
- tobjerr = get_stats_for_obj(di, di->tosnap, dobj, tobjname,
- MAXPATHLEN, &tsb);
- if (tobjerr && di->zerr != ENOENT && di->zerr != ENOTSUP)
- return (-1);
-
- /*
- * Unallocated object sharing the same meta dnode block
- */
- if (fobjerr && tobjerr) {
- ASSERT(di->zerr == ENOENT || di->zerr == ENOTSUP);
- di->zerr = 0;
- return (0);
- }
-
- di->zerr = 0; /* negate get_stats_for_obj() from side that failed */
- fmode = fsb.zs_mode & S_IFMT;
- tmode = tsb.zs_mode & S_IFMT;
- if (fmode == S_IFDIR || tmode == S_IFDIR || fsb.zs_links == 0 ||
- tsb.zs_links == 0)
- change = 0;
- else
- change = tsb.zs_links - fsb.zs_links;
-
- if (fobjerr) {
- if (change) {
- print_link_change(fp, di, change, tobjname, &tsb);
- return (0);
- }
- print_file(fp, di, ZDIFF_ADDED, tobjname, &tsb);
- return (0);
- } else if (tobjerr) {
- if (change) {
- print_link_change(fp, di, change, fobjname, &fsb);
- return (0);
- }
- print_file(fp, di, ZDIFF_REMOVED, fobjname, &fsb);
- return (0);
- }
-
- if (fmode != tmode && fsb.zs_gen == tsb.zs_gen)
- tsb.zs_gen++; /* Force a generational difference */
-
- /* Simple modification or no change */
- if (fsb.zs_gen == tsb.zs_gen) {
- /* No apparent changes. Could we assert !this? */
- if (fsb.zs_ctime[0] == tsb.zs_ctime[0] &&
- fsb.zs_ctime[1] == tsb.zs_ctime[1])
- return (0);
- if (change) {
- print_link_change(fp, di, change,
- change > 0 ? fobjname : tobjname, &tsb);
- } else if (strcmp(fobjname, tobjname) == 0) {
- print_file(fp, di, ZDIFF_MODIFIED, fobjname, &tsb);
- } else {
- print_rename(fp, di, fobjname, tobjname, &tsb);
- }
- return (0);
- } else {
- /* file re-created or object re-used */
- print_file(fp, di, ZDIFF_REMOVED, fobjname, &fsb);
- print_file(fp, di, ZDIFF_ADDED, tobjname, &tsb);
- return (0);
- }
-}
-
-static int
-write_inuse_diffs(FILE *fp, differ_info_t *di, dmu_diff_record_t *dr)
-{
- uint64_t o;
- int err;
-
- for (o = dr->ddr_first; o <= dr->ddr_last; o++) {
- if ((err = write_inuse_diffs_one(fp, di, o)) != 0)
- return (err);
- }
- return (0);
-}
-
-static int
-describe_free(FILE *fp, differ_info_t *di, uint64_t object, char *namebuf,
- int maxlen)
-{
- struct zfs_stat sb;
-
- if (get_stats_for_obj(di, di->fromsnap, object, namebuf,
- maxlen, &sb) != 0) {
- return (-1);
- }
- /* Don't print if in the delete queue on from side */
- if (di->zerr == ESTALE) {
- di->zerr = 0;
- return (0);
- }
-
- print_file(fp, di, ZDIFF_REMOVED, namebuf, &sb);
- return (0);
-}
-
-static int
-write_free_diffs(FILE *fp, differ_info_t *di, dmu_diff_record_t *dr)
-{
- zfs_cmd_t zc = { 0 };
- libzfs_handle_t *lhdl = di->zhp->zfs_hdl;
- char fobjname[MAXPATHLEN];
-
- (void) strlcpy(zc.zc_name, di->fromsnap, sizeof (zc.zc_name));
- zc.zc_obj = dr->ddr_first - 1;
-
- ASSERT(di->zerr == 0);
-
- while (zc.zc_obj < dr->ddr_last) {
- int err;
-
- err = ioctl(lhdl->libzfs_fd, ZFS_IOC_NEXT_OBJ, &zc);
- if (err == 0) {
- if (zc.zc_obj == di->shares) {
- zc.zc_obj++;
- continue;
- }
- if (zc.zc_obj > dr->ddr_last) {
- break;
- }
- err = describe_free(fp, di, zc.zc_obj, fobjname,
- MAXPATHLEN);
- if (err)
- break;
- } else if (errno == ESRCH) {
- break;
- } else {
- (void) snprintf(di->errbuf, sizeof (di->errbuf),
- dgettext(TEXT_DOMAIN,
- "next allocated object (> %jd) find failure"),
- (uintmax_t)zc.zc_obj);
- di->zerr = errno;
- break;
- }
- }
- if (di->zerr)
- return (-1);
- return (0);
-}
-
-static void *
-differ(void *arg)
-{
- differ_info_t *di = arg;
- dmu_diff_record_t dr;
- FILE *ofp;
- int err = 0;
-
- if ((ofp = fdopen(di->outputfd, "w")) == NULL) {
- di->zerr = errno;
- (void) strerror_r(errno, di->errbuf, sizeof (di->errbuf));
- (void) close(di->datafd);
- return ((void *)-1);
- }
-
- for (;;) {
- char *cp = (char *)&dr;
- int len = sizeof (dr);
- int rv;
-
- do {
- rv = read(di->datafd, cp, len);
- cp += rv;
- len -= rv;
- } while (len > 0 && rv > 0);
-
- if (rv < 0 || (rv == 0 && len != sizeof (dr))) {
- di->zerr = EPIPE;
- break;
- } else if (rv == 0) {
- /* end of file at a natural breaking point */
- break;
- }
-
- switch (dr.ddr_type) {
- case DDR_FREE:
- err = write_free_diffs(ofp, di, &dr);
- break;
- case DDR_INUSE:
- err = write_inuse_diffs(ofp, di, &dr);
- break;
- default:
- di->zerr = EPIPE;
- break;
- }
-
- if (err || di->zerr)
- break;
- }
-
- (void) fclose(ofp);
- (void) close(di->datafd);
- if (err)
- return ((void *)-1);
- if (di->zerr) {
- ASSERT(di->zerr == EPIPE);
- (void) snprintf(di->errbuf, sizeof (di->errbuf),
- dgettext(TEXT_DOMAIN,
- "Internal error: bad data from diff IOCTL"));
- return ((void *)-1);
- }
- return ((void *)0);
-}
-
-static int
-find_shares_object(differ_info_t *di)
-{
- char fullpath[MAXPATHLEN];
- struct stat64 sb = { 0 };
-
- (void) strlcpy(fullpath, di->dsmnt, MAXPATHLEN);
- (void) strlcat(fullpath, ZDIFF_SHARESDIR, MAXPATHLEN);
-
- if (stat64(fullpath, &sb) != 0) {
-#ifdef illumos
- (void) snprintf(di->errbuf, sizeof (di->errbuf),
- dgettext(TEXT_DOMAIN, "Cannot stat %s"), fullpath);
- return (zfs_error(di->zhp->zfs_hdl, EZFS_DIFF, di->errbuf));
-#else
- return (0);
-#endif
- }
-
- di->shares = (uint64_t)sb.st_ino;
- return (0);
-}
-
-static int
-make_temp_snapshot(differ_info_t *di)
-{
- libzfs_handle_t *hdl = di->zhp->zfs_hdl;
- zfs_cmd_t zc = { 0 };
-
- (void) snprintf(zc.zc_value, sizeof (zc.zc_value),
- ZDIFF_PREFIX, getpid());
- (void) strlcpy(zc.zc_name, di->ds, sizeof (zc.zc_name));
- zc.zc_cleanup_fd = di->cleanupfd;
-
- if (ioctl(hdl->libzfs_fd, ZFS_IOC_TMP_SNAPSHOT, &zc) != 0) {
- int err = errno;
- if (err == EPERM) {
- (void) snprintf(di->errbuf, sizeof (di->errbuf),
- dgettext(TEXT_DOMAIN, "The diff delegated "
- "permission is needed in order\nto create a "
- "just-in-time snapshot for diffing\n"));
- return (zfs_error(hdl, EZFS_DIFF, di->errbuf));
- } else {
- (void) snprintf(di->errbuf, sizeof (di->errbuf),
- dgettext(TEXT_DOMAIN, "Cannot create just-in-time "
- "snapshot of '%s'"), zc.zc_name);
- return (zfs_standard_error(hdl, err, di->errbuf));
- }
- }
-
- di->tmpsnap = zfs_strdup(hdl, zc.zc_value);
- di->tosnap = zfs_asprintf(hdl, "%s@%s", di->ds, di->tmpsnap);
- return (0);
-}
-
-static void
-teardown_differ_info(differ_info_t *di)
-{
- free(di->ds);
- free(di->dsmnt);
- free(di->fromsnap);
- free(di->frommnt);
- free(di->tosnap);
- free(di->tmpsnap);
- free(di->tomnt);
- (void) close(di->cleanupfd);
-}
-
-static int
-get_snapshot_names(differ_info_t *di, const char *fromsnap,
- const char *tosnap)
-{
- libzfs_handle_t *hdl = di->zhp->zfs_hdl;
- char *atptrf = NULL;
- char *atptrt = NULL;
- int fdslen, fsnlen;
- int tdslen, tsnlen;
-
- /*
- * Can accept
- * dataset@snap1
- * dataset@snap1 dataset@snap2
- * dataset@snap1 @snap2
- * dataset@snap1 dataset
- * @snap1 dataset@snap2
- */
- if (tosnap == NULL) {
- /* only a from snapshot given, must be valid */
- (void) snprintf(di->errbuf, sizeof (di->errbuf),
- dgettext(TEXT_DOMAIN,
- "Badly formed snapshot name %s"), fromsnap);
-
- if (!zfs_validate_name(hdl, fromsnap, ZFS_TYPE_SNAPSHOT,
- B_FALSE)) {
- return (zfs_error(hdl, EZFS_INVALIDNAME,
- di->errbuf));
- }
-
- atptrf = strchr(fromsnap, '@');
- ASSERT(atptrf != NULL);
- fdslen = atptrf - fromsnap;
-
- di->fromsnap = zfs_strdup(hdl, fromsnap);
- di->ds = zfs_strdup(hdl, fromsnap);
- di->ds[fdslen] = '\0';
-
- /* the to snap will be a just-in-time snap of the head */
- return (make_temp_snapshot(di));
- }
-
- (void) snprintf(di->errbuf, sizeof (di->errbuf),
- dgettext(TEXT_DOMAIN,
- "Unable to determine which snapshots to compare"));
-
- atptrf = strchr(fromsnap, '@');
- atptrt = strchr(tosnap, '@');
- fdslen = atptrf ? atptrf - fromsnap : strlen(fromsnap);
- tdslen = atptrt ? atptrt - tosnap : strlen(tosnap);
- fsnlen = strlen(fromsnap) - fdslen; /* includes @ sign */
- tsnlen = strlen(tosnap) - tdslen; /* includes @ sign */
-
- if (fsnlen <= 1 || tsnlen == 1 || (fdslen == 0 && tdslen == 0) ||
- (fsnlen == 0 && tsnlen == 0)) {
- return (zfs_error(hdl, EZFS_INVALIDNAME, di->errbuf));
- } else if ((fdslen > 0 && tdslen > 0) &&
- ((tdslen != fdslen || strncmp(fromsnap, tosnap, fdslen) != 0))) {
- /*
- * not the same dataset name, might be okay if
- * tosnap is a clone of a fromsnap descendant.
- */
- char origin[ZFS_MAX_DATASET_NAME_LEN];
- zprop_source_t src;
- zfs_handle_t *zhp;
-
- di->ds = zfs_alloc(di->zhp->zfs_hdl, tdslen + 1);
- (void) strncpy(di->ds, tosnap, tdslen);
- di->ds[tdslen] = '\0';
-
- zhp = zfs_open(hdl, di->ds, ZFS_TYPE_FILESYSTEM);
- while (zhp != NULL) {
- if (zfs_prop_get(zhp, ZFS_PROP_ORIGIN, origin,
- sizeof (origin), &src, NULL, 0, B_FALSE) != 0) {
- (void) zfs_close(zhp);
- zhp = NULL;
- break;
- }
- if (strncmp(origin, fromsnap, fsnlen) == 0)
- break;
-
- (void) zfs_close(zhp);
- zhp = zfs_open(hdl, origin, ZFS_TYPE_FILESYSTEM);
- }
-
- if (zhp == NULL) {
- (void) snprintf(di->errbuf, sizeof (di->errbuf),
- dgettext(TEXT_DOMAIN,
- "Not an earlier snapshot from the same fs"));
- return (zfs_error(hdl, EZFS_INVALIDNAME, di->errbuf));
- } else {
- (void) zfs_close(zhp);
- }
-
- di->isclone = B_TRUE;
- di->fromsnap = zfs_strdup(hdl, fromsnap);
- if (tsnlen) {
- di->tosnap = zfs_strdup(hdl, tosnap);
- } else {
- return (make_temp_snapshot(di));
- }
- } else {
- int dslen = fdslen ? fdslen : tdslen;
-
- di->ds = zfs_alloc(hdl, dslen + 1);
- (void) strncpy(di->ds, fdslen ? fromsnap : tosnap, dslen);
- di->ds[dslen] = '\0';
-
- di->fromsnap = zfs_asprintf(hdl, "%s%s", di->ds, atptrf);
- if (tsnlen) {
- di->tosnap = zfs_asprintf(hdl, "%s%s", di->ds, atptrt);
- } else {
- return (make_temp_snapshot(di));
- }
- }
- return (0);
-}
-
-static int
-get_mountpoint(differ_info_t *di, char *dsnm, char **mntpt)
-{
- boolean_t mounted;
-
- mounted = is_mounted(di->zhp->zfs_hdl, dsnm, mntpt);
- if (mounted == B_FALSE) {
- (void) snprintf(di->errbuf, sizeof (di->errbuf),
- dgettext(TEXT_DOMAIN,
- "Cannot diff an unmounted snapshot"));
- return (zfs_error(di->zhp->zfs_hdl, EZFS_BADTYPE, di->errbuf));
- }
-
- /* Avoid a double slash at the beginning of root-mounted datasets */
- if (**mntpt == '/' && *(*mntpt + 1) == '\0')
- **mntpt = '\0';
- return (0);
-}
-
-static int
-get_mountpoints(differ_info_t *di)
-{
- char *strptr;
- char *frommntpt;
-
- /*
- * first get the mountpoint for the parent dataset
- */
- if (get_mountpoint(di, di->ds, &di->dsmnt) != 0)
- return (-1);
-
- strptr = strchr(di->tosnap, '@');
- ASSERT3P(strptr, !=, NULL);
- di->tomnt = zfs_asprintf(di->zhp->zfs_hdl, "%s%s%s", di->dsmnt,
- ZDIFF_SNAPDIR, ++strptr);
-
- strptr = strchr(di->fromsnap, '@');
- ASSERT3P(strptr, !=, NULL);
-
- frommntpt = di->dsmnt;
- if (di->isclone) {
- char *mntpt;
- int err;
-
- *strptr = '\0';
- err = get_mountpoint(di, di->fromsnap, &mntpt);
- *strptr = '@';
- if (err != 0)
- return (-1);
- frommntpt = mntpt;
- }
-
- di->frommnt = zfs_asprintf(di->zhp->zfs_hdl, "%s%s%s", frommntpt,
- ZDIFF_SNAPDIR, ++strptr);
-
- if (di->isclone)
- free(frommntpt);
-
- return (0);
-}
-
-static int
-setup_differ_info(zfs_handle_t *zhp, const char *fromsnap,
- const char *tosnap, differ_info_t *di)
-{
- di->zhp = zhp;
-
- di->cleanupfd = open(ZFS_DEV, O_RDWR|O_EXCL);
- VERIFY(di->cleanupfd >= 0);
-
- if (get_snapshot_names(di, fromsnap, tosnap) != 0)
- return (-1);
-
- if (get_mountpoints(di) != 0)
- return (-1);
-
- if (find_shares_object(di) != 0)
- return (-1);
-
- return (0);
-}
-
-int
-zfs_show_diffs(zfs_handle_t *zhp, int outfd, const char *fromsnap,
- const char *tosnap, int flags)
-{
- zfs_cmd_t zc = { 0 };
- char errbuf[1024];
- differ_info_t di = { 0 };
- pthread_t tid;
- int pipefd[2];
- int iocerr;
-
- (void) snprintf(errbuf, sizeof (errbuf),
- dgettext(TEXT_DOMAIN, "zfs diff failed"));
-
- if (setup_differ_info(zhp, fromsnap, tosnap, &di)) {
- teardown_differ_info(&di);
- return (-1);
- }
-
- if (pipe(pipefd)) {
- zfs_error_aux(zhp->zfs_hdl, strerror(errno));
- teardown_differ_info(&di);
- return (zfs_error(zhp->zfs_hdl, EZFS_PIPEFAILED, errbuf));
- }
-
- di.scripted = (flags & ZFS_DIFF_PARSEABLE);
- di.classify = (flags & ZFS_DIFF_CLASSIFY);
- di.timestamped = (flags & ZFS_DIFF_TIMESTAMP);
-
- di.outputfd = outfd;
- di.datafd = pipefd[0];
-
- if (pthread_create(&tid, NULL, differ, &di)) {
- zfs_error_aux(zhp->zfs_hdl, strerror(errno));
- (void) close(pipefd[0]);
- (void) close(pipefd[1]);
- teardown_differ_info(&di);
- return (zfs_error(zhp->zfs_hdl,
- EZFS_THREADCREATEFAILED, errbuf));
- }
-
- /* do the ioctl() */
- (void) strlcpy(zc.zc_value, di.fromsnap, strlen(di.fromsnap) + 1);
- (void) strlcpy(zc.zc_name, di.tosnap, strlen(di.tosnap) + 1);
- zc.zc_cookie = pipefd[1];
-
- iocerr = ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_DIFF, &zc);
- if (iocerr != 0) {
- (void) snprintf(errbuf, sizeof (errbuf),
- dgettext(TEXT_DOMAIN, "Unable to obtain diffs"));
- if (errno == EPERM) {
- zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
- "\n The sys_mount privilege or diff delegated "
- "permission is needed\n to execute the "
- "diff ioctl"));
- } else if (errno == EXDEV) {
- zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
- "\n Not an earlier snapshot from the same fs"));
- } else if (errno != EPIPE || di.zerr == 0) {
- zfs_error_aux(zhp->zfs_hdl, strerror(errno));
- }
- (void) close(pipefd[1]);
- (void) pthread_cancel(tid);
- (void) pthread_join(tid, NULL);
- teardown_differ_info(&di);
- if (di.zerr != 0 && di.zerr != EPIPE) {
- zfs_error_aux(zhp->zfs_hdl, strerror(di.zerr));
- return (zfs_error(zhp->zfs_hdl, EZFS_DIFF, di.errbuf));
- } else {
- return (zfs_error(zhp->zfs_hdl, EZFS_DIFFDATA, errbuf));
- }
- }
-
- (void) close(pipefd[1]);
- (void) pthread_join(tid, NULL);
-
- if (di.zerr != 0) {
- zfs_error_aux(zhp->zfs_hdl, strerror(di.zerr));
- return (zfs_error(zhp->zfs_hdl, EZFS_DIFF, di.errbuf));
- }
- teardown_differ_info(&di);
- return (0);
-}