From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Create a new xfs_io command to call the new XFS metadata scrub ioctl.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
io/Makefile | 3 -
io/init.c | 1
io/io.h | 2
io/scrub.c | 244 +++++++++++++++++++++++++++++++++++++++++++++++++++++
man/man8/xfs_io.8 | 10 ++
5 files changed, 259 insertions(+), 1 deletion(-)
create mode 100644 io/scrub.c
diff --git a/io/Makefile b/io/Makefile
index 050d6bd..b983bcc 100644
--- a/io/Makefile
+++ b/io/Makefile
@@ -11,7 +11,8 @@ HFILES = init.h io.h
CFILES = init.c \
attr.c bmap.c cowextsize.c encrypt.c file.c freeze.c fsync.c \
getrusage.c imap.c link.c mmap.c open.c parent.c pread.c prealloc.c \
- pwrite.c reflink.c seek.c shutdown.c stat.c sync.c truncate.c utimes.c
+ pwrite.c reflink.c scrub.c seek.c shutdown.c stat.c sync.c truncate.c \
+ utimes.c
LLDLIBS = $(LIBXCMD) $(LIBHANDLE) $(LIBPTHREAD)
LTDEPENDENCIES = $(LIBXCMD) $(LIBHANDLE)
diff --git a/io/init.c b/io/init.c
index 20d5f80..9e576fe 100644
--- a/io/init.c
+++ b/io/init.c
@@ -84,6 +84,7 @@ init_commands(void)
readdir_init();
reflink_init();
resblks_init();
+ scrub_init();
seek_init();
sendfile_init();
shutdown_init();
diff --git a/io/io.h b/io/io.h
index 3862985..82e142f 100644
--- a/io/io.h
+++ b/io/io.h
@@ -185,3 +185,5 @@ extern void fsmap_init(void);
#else
# define fsmap_init() do { } while (0)
#endif
+
+extern void scrub_init(void);
diff --git a/io/scrub.c b/io/scrub.c
new file mode 100644
index 0000000..cd2a1ee
--- /dev/null
+++ b/io/scrub.c
@@ -0,0 +1,244 @@
+/*
+ * Copyright (C) 2017 Oracle. All Rights Reserved.
+ *
+ * Author: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <sys/uio.h>
+#include <xfs/xfs.h>
+#include "command.h"
+#include "input.h"
+#include "init.h"
+#include "path.h"
+#include "io.h"
+
+static struct cmdinfo scrub_cmd;
+
+/* Type info and names for the scrub types. */
+enum scrub_type {
+ ST_NONE, /* disabled */
+ ST_PERAG, /* per-AG metadata */
+ ST_FS, /* per-FS metadata */
+ ST_INODE, /* per-inode metadata */
+};
+
+struct scrub_descr {
+ const char *name;
+ enum scrub_type type;
+};
+
+static const struct scrub_descr scrubbers[XFS_SCRUB_TYPE_NR] = {
+ [XFS_SCRUB_TYPE_PROBE] = {"probe", ST_NONE},
+ [XFS_SCRUB_TYPE_SB] = {"sb", ST_PERAG},
+ [XFS_SCRUB_TYPE_AGF] = {"agf", ST_PERAG},
+ [XFS_SCRUB_TYPE_AGFL] = {"agfl", ST_PERAG},
+ [XFS_SCRUB_TYPE_AGI] = {"agi", ST_PERAG},
+ [XFS_SCRUB_TYPE_BNOBT] = {"bnobt", ST_PERAG},
+ [XFS_SCRUB_TYPE_CNTBT] = {"cntbt", ST_PERAG},
+ [XFS_SCRUB_TYPE_INOBT] = {"inobt", ST_PERAG},
+ [XFS_SCRUB_TYPE_FINOBT] = {"finobt", ST_PERAG},
+ [XFS_SCRUB_TYPE_RMAPBT] = {"rmapbt", ST_PERAG},
+ [XFS_SCRUB_TYPE_REFCNTBT] = {"refcountbt", ST_PERAG},
+ [XFS_SCRUB_TYPE_INODE] = {"inode", ST_INODE},
+ [XFS_SCRUB_TYPE_BMBTD] = {"bmapbtd", ST_INODE},
+ [XFS_SCRUB_TYPE_BMBTA] = {"bmapbta", ST_INODE},
+ [XFS_SCRUB_TYPE_BMBTC] = {"bmapbtc", ST_INODE},
+ [XFS_SCRUB_TYPE_DIR] = {"directory", ST_INODE},
+ [XFS_SCRUB_TYPE_XATTR] = {"xattr", ST_INODE},
+ [XFS_SCRUB_TYPE_SYMLINK] = {"symlink", ST_INODE},
+ [XFS_SCRUB_TYPE_PARENT] = {"parent", ST_INODE},
+ [XFS_SCRUB_TYPE_RTBITMAP] = {"rtbitmap", ST_FS},
+ [XFS_SCRUB_TYPE_RTSUM] = {"rtsummary", ST_FS},
+ [XFS_SCRUB_TYPE_UQUOTA] = {"usrquota", ST_FS},
+ [XFS_SCRUB_TYPE_GQUOTA] = {"grpquota", ST_FS},
+ [XFS_SCRUB_TYPE_PQUOTA] = {"prjquota", ST_FS},
+};
+
+static void
+scrub_help(void)
+{
+ const struct scrub_descr *d;
+ int i;
+
+ printf(_("\n\
+ Scrubs a piece of XFS filesystem metadata. The first argument is the type\n\
+ of metadata to examine. Allocation group number(s) can be specified to\n\
+ restrict the scrub operation to a subset of allocation groups.\n\
+ Certain metadata types do not take AG numbers.\n\
+\n\
+ Example:\n\
+ 'scrub inobt 3' - scrub the inode btree in AG 3.\n\
+ 'scrub bmapbtd 128 13525' - scrubs the extent map of inode 128 gen 13525.\n\
+\n\
+ Known metadata scrub types are:"));
+ for (i = 0, d = scrubbers; i < XFS_SCRUB_TYPE_NR; i++, d++)
+ printf(" %s", d->name);
+ printf("\n");
+}
+
+static void
+scrub_ioctl(
+ int fd,
+ int type,
+ uint64_t control,
+ uint32_t control2)
+{
+ struct xfs_scrub_metadata meta;
+ const struct scrub_descr *sc;
+ int error;
+
+ sc = &scrubbers[type];
+ memset(&meta, 0, sizeof(meta));
+ meta.sm_type = type;
+ switch (sc->type) {
+ case ST_PERAG:
+ meta.sm_agno = control;
+ break;
+ case ST_INODE:
+ meta.sm_ino = control;
+ meta.sm_gen = control2;
+ break;
+ case ST_NONE:
+ case ST_FS:
+ /* no control parameters */
+ break;
+ }
+ meta.sm_flags = 0;
+
+ error = ioctl(fd, XFS_IOC_SCRUB_METADATA, &meta);
+ if (error)
+ perror("scrub");
+ if (meta.sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
+ printf(_("Corruption detected.\n"));
+ if (meta.sm_flags & XFS_SCRUB_OFLAG_PREEN)
+ printf(_("Optimization possible.\n"));
+ if (meta.sm_flags & XFS_SCRUB_OFLAG_XFAIL)
+ printf(_("Cross-referencing failed.\n"));
+ if (meta.sm_flags & XFS_SCRUB_OFLAG_XCORRUPT)
+ printf(_("Corruption detected during cross-referencing.\n"));
+ if (meta.sm_flags & XFS_SCRUB_OFLAG_INCOMPLETE)
+ printf(_("Scan was not complete.\n"));
+}
+
+static int
+parse_args(
+ int argc,
+ char **argv,
+ struct cmdinfo *cmdinfo,
+ void (*fn)(int, int, uint64_t, uint32_t))
+{
+ char *p;
+ int type = -1;
+ int i, c;
+ uint64_t control = 0;
+ uint32_t control2 = 0;
+ const struct scrub_descr *d = NULL;
+
+ while ((c = getopt(argc, argv, "")) != EOF) {
+ switch (c) {
+ default:
+ return command_usage(cmdinfo);
+ }
+ }
+ if (optind > argc - 1)
+ return command_usage(cmdinfo);
+
+ for (i = 0, d = scrubbers; i < XFS_SCRUB_TYPE_NR; i++, d++) {
+ if (strcmp(d->name, argv[optind]) == 0) {
+ type = i;
+ break;
+ }
+ }
+ optind++;
+
+ if (type < 0)
+ return command_usage(cmdinfo);
+
+ switch (d->type) {
+ case ST_INODE:
+ if (optind == argc) {
+ control = 0;
+ control2 = 0;
+ } else if (optind == argc - 2) {
+ control = strtoull(argv[optind], &p, 0);
+ if (*p != '\0') {
+ fprintf(stderr,
+ _("Bad inode number %s.\n"), argv[i]);
+ return 0;
+ }
+ control2 = strtoul(argv[optind + 1], &p, 0);
+ if (*p != '\0') {
+ fprintf(stderr,
+ _("Bad generation number %s.\n"), argv[i]);
+ return 0;
+ }
+ } else {
+ fprintf(stderr,
+ _("Must specify inode number and generation.\n"));
+ return 0;
+ }
+ break;
+ case ST_PERAG:
+ case ST_NONE:
+ if (optind != argc - 1) {
+ fprintf(stderr,
+ _("Must specify AG number.\n"));
+ return 0;
+ }
+ control = strtoul(argv[optind], &p, 0);
+ if (*p != '\0') {
+ fprintf(stderr,
+ _("Bad AG number %s.\n"), argv[i]);
+ return 0;
+ }
+ break;
+ default:
+ if (optind != argc) {
+ fprintf(stderr,
+ _("No parameters allowed.\n"));
+ return 0;
+ }
+ }
+ fn(file->fd, type, control, control2);
+
+ return 0;
+}
+
+static int
+scrub_f(
+ int argc,
+ char **argv)
+{
+ return parse_args(argc, argv, &scrub_cmd, scrub_ioctl);
+}
+
+void
+scrub_init(void)
+{
+ scrub_cmd.name = "scrub";
+ scrub_cmd.altname = "sc";
+ scrub_cmd.cfunc = scrub_f;
+ scrub_cmd.argmin = 1;
+ scrub_cmd.argmax = -1;
+ scrub_cmd.flags = CMD_NOMAP_OK;
+ scrub_cmd.args =
+_("type [agno...]");
+ scrub_cmd.oneline =
+ _("scrubs filesystem metadata");
+ scrub_cmd.help = scrub_help;
+
+ add_command(&scrub_cmd);
+}
diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
index 9bf1a47..ed10ba6 100644
--- a/man/man8/xfs_io.8
+++ b/man/man8/xfs_io.8
@@ -1119,6 +1119,16 @@ version of policy structure (numeric)
.BR get_encpolicy
On filesystems that support encryption, display the encryption policy of the
current file.
+.TP
+.BI "scrub " type " [ " agnumber... " | " "ino" " " "gen" " ]"
+Scrub internal XFS filesystem metadata. The
+.BI type
+parameter specifies which type of metadata to scrub.
+For AG metadata, AG numbers can optionally be specified to restrict the
+scrub operation to a particular set of allocation groups.
+By default, all allocation groups are scrubbed.
+For file metadata, the scrub is applied to the open file unless the
+inode number and generation number are specified.
.SH SEE ALSO
.BR mkfs.xfs (8),
--
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