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-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);
-}