diff options
Diffstat (limited to 'lib/libzfs/libzfs_diff.c')
| -rw-r--r-- | lib/libzfs/libzfs_diff.c | 830 |
1 files changed, 0 insertions, 830 deletions
diff --git a/lib/libzfs/libzfs_diff.c b/lib/libzfs/libzfs_diff.c deleted file mode 100644 index 5f50bce531f7..000000000000 --- a/lib/libzfs/libzfs_diff.c +++ /dev/null @@ -1,830 +0,0 @@ -// SPDX-License-Identifier: CDDL-1.0 -/* - * 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 https://opensource.org/licenses/CDDL-1.0. - * 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 <libzutil.h> -#include "libzfs_impl.h" - -#define ZDIFF_SNAPDIR "/.zfs/snapshot/" -#define ZDIFF_PREFIX "zfs-diff-%d" - -#define ZDIFF_ADDED '+' -#define ZDIFF_MODIFIED "M" -#define ZDIFF_REMOVED '-' -#define ZDIFF_RENAMED "R" - -#define ZDIFF_ADDED_COLOR ANSI_GREEN -#define ZDIFF_MODIFIED_COLOR ANSI_YELLOW -#define ZDIFF_REMOVED_COLOR ANSI_RED -#define ZDIFF_RENAMED_COLOR ANSI_BOLD_BLUE - -/* - * 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 = zfs_ioctl(di->zhp->zfs_hdl, 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) { - ASSERT0(di->zerr); - (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 if (di->zerr == EACCES) { - (void) snprintf(di->errbuf, sizeof (di->errbuf), - dgettext(TEXT_DOMAIN, - "Key must be loaded to discover path names")); - return (-1); - } else { - (void) snprintf(di->errbuf, sizeof (di->errbuf), - dgettext(TEXT_DOMAIN, - "Unable to determine path or stats for " - "object %lld in %s"), (longlong_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 4-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) fputc(c, fp); - } else { - (void) fprintf(fp, "\\%04hho", (uint8_t)c); - } - } -} - -/* - * Takes the type of change (like `print_file`), outputs the appropriate color - */ -static const char * -type_to_color(char type) -{ - if (type == '+') - return (ZDIFF_ADDED_COLOR); - else if (type == '-') - return (ZDIFF_REMOVED_COLOR); - else if (type == 'M') - return (ZDIFF_MODIFIED_COLOR); - else if (type == 'R') - return (ZDIFF_RENAMED_COLOR); - else - return (NULL); -} - - -static char -get_what(mode_t what) -{ - switch (what & S_IFMT) { - case S_IFBLK: - return ('B'); - case S_IFCHR: - return ('C'); - case S_IFDIR: - return ('/'); -#ifdef S_IFDOOR - case S_IFDOOR: - return ('>'); -#endif - case S_IFIFO: - return ('|'); - case S_IFLNK: - return ('@'); -#ifdef S_IFPORT - case S_IFPORT: - return ('P'); -#endif - case S_IFSOCK: - return ('='); - case S_IFREG: - return ('F'); - default: - return ('?'); - } -} - -static void -print_cmn(FILE *fp, differ_info_t *di, const char *file) -{ - if (!di->no_mangle) { - stream_bytes(fp, di->dsmnt); - stream_bytes(fp, file); - } else { - (void) fputs(di->dsmnt, fp); - (void) fputs(file, fp); - } -} - -static void -print_rename(FILE *fp, differ_info_t *di, const char *old, const char *new, - zfs_stat_t *isb) -{ - if (isatty(fileno(fp))) - color_start(ZDIFF_RENAMED_COLOR); - if (di->timestamped) - (void) fprintf(fp, "%10lld.%09lld\t", - (longlong_t)isb->zs_ctime[0], - (longlong_t)isb->zs_ctime[1]); - (void) fputs(ZDIFF_RENAMED "\t", fp); - if (di->classify) - (void) fprintf(fp, "%c\t", get_what(isb->zs_mode)); - print_cmn(fp, di, old); - (void) fputs(di->scripted ? "\t" : " -> ", fp); - print_cmn(fp, di, new); - (void) fputc('\n', fp); - - if (isatty(fileno(fp))) - color_end(); -} - -static void -print_link_change(FILE *fp, differ_info_t *di, int delta, const char *file, - zfs_stat_t *isb) -{ - if (isatty(fileno(fp))) - color_start(ZDIFF_MODIFIED_COLOR); - - if (di->timestamped) - (void) fprintf(fp, "%10lld.%09lld\t", - (longlong_t)isb->zs_ctime[0], - (longlong_t)isb->zs_ctime[1]); - (void) fputs(ZDIFF_MODIFIED "\t", fp); - if (di->classify) - (void) fprintf(fp, "%c\t", get_what(isb->zs_mode)); - print_cmn(fp, di, file); - (void) fprintf(fp, "\t(%+d)\n", delta); - if (isatty(fileno(fp))) - color_end(); -} - -static void -print_file(FILE *fp, differ_info_t *di, char type, const char *file, - zfs_stat_t *isb) -{ - if (isatty(fileno(fp))) - color_start(type_to_color(type)); - - 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) - (void) fprintf(fp, "%c\t", get_what(isb->zs_mode)); - print_cmn(fp, di, file); - (void) fputc('\n', fp); - - if (isatty(fileno(fp))) - color_end(); -} - -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]; - boolean_t already_logged = B_FALSE; - 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. - * For any other error we print a warning which includes the - * errno and continue. - */ - - fobjerr = get_stats_for_obj(di, di->fromsnap, dobj, fobjname, - MAXPATHLEN, &fsb); - if (fobjerr && di->zerr != ENOTSUP && di->zerr != ENOENT) { - zfs_error_aux(di->zhp->zfs_hdl, "%s", zfs_strerror(di->zerr)); - zfs_error(di->zhp->zfs_hdl, di->zerr, di->errbuf); - /* - * Let's not print an error for the same object more than - * once if it happens in both snapshots - */ - already_logged = B_TRUE; - } - - tobjerr = get_stats_for_obj(di, di->tosnap, dobj, tobjname, - MAXPATHLEN, &tsb); - - if (tobjerr && di->zerr != ENOTSUP && di->zerr != ENOENT) { - if (!already_logged) { - zfs_error_aux(di->zhp->zfs_hdl, - "%s", zfs_strerror(di->zerr)); - zfs_error(di->zhp->zfs_hdl, di->zerr, di->errbuf); - } - } - /* - * Unallocated object sharing the same meta dnode block - */ - if (fobjerr && tobjerr) { - 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; - - (void) get_stats_for_obj(di, di->fromsnap, object, namebuf, - maxlen, &sb); - - /* Don't print if in the delete queue on from side */ - if (di->zerr == ESTALE || di->zerr == ENOENT) { - 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; - - ASSERT0(di->zerr); - - while (zc.zc_obj < dr->ddr_last) { - int err; - - err = zfs_ioctl(lhdl, 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; - } - (void) describe_free(fp, di, zc.zc_obj, fobjname, - MAXPATHLEN); - } else if (errno == ESRCH) { - break; - } else { - (void) snprintf(di->errbuf, sizeof (di->errbuf), - dgettext(TEXT_DOMAIN, - "next allocated object (> %lld) find failure"), - (longlong_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; - strlcpy(di->errbuf, zfs_strerror(errno), 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 -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 (zfs_ioctl(hdl, 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 - * fdslen fsnlen tdslen tsnlen - * dataset@snap1 - * 0. dataset@snap1 dataset@snap2 >0 >1 >0 >1 - * 1. dataset@snap1 @snap2 >0 >1 ==0 >1 - * 2. dataset@snap1 dataset >0 >1 >0 ==0 - * 3. @snap1 dataset@snap2 ==0 >1 >0 >1 - * 4. @snap1 dataset ==0 >1 >0 ==0 - */ - 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)) { - 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) strlcpy(di->ds, tosnap, tdslen + 1); - - 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) strlcpy(di->ds, fdslen ? fromsnap : tosnap, dslen + 1); - - 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_CLOEXEC); - 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[ERRBUFLEN]; - 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 (pipe2(pipefd, O_CLOEXEC)) { - zfs_error_aux(zhp->zfs_hdl, "%s", zfs_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.no_mangle = (flags & ZFS_DIFF_NO_MANGLE); - - di.outputfd = outfd; - di.datafd = pipefd[0]; - - if (pthread_create(&tid, NULL, differ, &di)) { - zfs_error_aux(zhp->zfs_hdl, "%s", zfs_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 = zfs_ioctl(zhp->zfs_hdl, 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, "%s", zfs_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, "%s", - zfs_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, "%s", zfs_strerror(di.zerr)); - return (zfs_error(zhp->zfs_hdl, EZFS_DIFF, di.errbuf)); - } - teardown_differ_info(&di); - return (0); -} |