Re: [PATCH 14/22] xfs: scrub inode block mappings

Darrick J. Wong
2017-07-24T20:05:35Z

On Sun, Jul 23, 2017 at 10:41:48AM -0700, Allison Henderson wrote:
>
>
> On 7/20/2017 9:40 PM, Darrick J. Wong wrote:
> >From: Darrick J. Wong <darrick.wong@oracle.com>
> >
> >Scrub an individual inode's block mappings to make sure they make sense.
> >
> >Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> >---
> > fs/xfs/Makefile | 1
> > fs/xfs/libxfs/xfs_fs.h | 5 +
> > fs/xfs/scrub/bmap.c | 378 ++++++++++++++++++++++++++++++++++++++++++++++++
> > fs/xfs/scrub/common.c | 12 ++
> > fs/xfs/scrub/common.h | 5 +
> > fs/xfs/xfs_trace.h | 5 +
> > 6 files changed, 404 insertions(+), 2 deletions(-)
> > create mode 100644 fs/xfs/scrub/bmap.c
> >
> >
> >diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
> >index 2ba33ad..89c67e1a 100644
> >--- a/fs/xfs/Makefile
> >+++ b/fs/xfs/Makefile
> >@@ -142,6 +142,7 @@ ifeq ($(CONFIG_XFS_ONLINE_SCRUB),y)
> > xfs-y += $(addprefix scrub/, \
> > agheader.o \
> > alloc.o \
> >+ bmap.o \
> > btree.o \
> > common.o \
> > ialloc.o \
> >diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
> >index 277b528..d762277 100644
> >--- a/fs/xfs/libxfs/xfs_fs.h
> >+++ b/fs/xfs/libxfs/xfs_fs.h
> >@@ -494,7 +494,10 @@ struct xfs_scrub_metadata {
> > #define XFS_SCRUB_TYPE_RMAPBT 10 /* reverse mapping btree */
> > #define XFS_SCRUB_TYPE_REFCNTBT 11 /* reference count btree */
> > #define XFS_SCRUB_TYPE_INODE 12 /* inode record */
> >-#define XFS_SCRUB_TYPE_MAX 12
> >+#define XFS_SCRUB_TYPE_BMBTD 13 /* data fork block mapping */
> >+#define XFS_SCRUB_TYPE_BMBTA 14 /* attr fork block mapping */
> >+#define XFS_SCRUB_TYPE_BMBTC 15 /* CoW fork block mapping */
> >+#define XFS_SCRUB_TYPE_MAX 15
> >
> > /* i: repair this metadata */
> > #define XFS_SCRUB_FLAG_REPAIR (1 << 0)
> >diff --git a/fs/xfs/scrub/bmap.c b/fs/xfs/scrub/bmap.c
> >new file mode 100644
> >index 0000000..731f026
> >--- /dev/null
> >+++ b/fs/xfs/scrub/bmap.c
> >@@ -0,0 +1,378 @@
> >+/*
> >+ * Copyright (C) 2017 Oracle. All Rights Reserved.
> >+ *
> >+ * Author: Darrick J. Wong <darrick.wong@oracle.com>
> >+ *
> >+ * 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; either version 2
> >+ * of the License, or (at your option) any later version.
> >+ *
> >+ * 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 "xfs.h"
> >+#include "xfs_fs.h"
> >+#include "xfs_shared.h"
> >+#include "xfs_format.h"
> >+#include "xfs_trans_resv.h"
> >+#include "xfs_mount.h"
> >+#include "xfs_defer.h"
> >+#include "xfs_btree.h"
> >+#include "xfs_bit.h"
> >+#include "xfs_log_format.h"
> >+#include "xfs_trans.h"
> >+#include "xfs_trace.h"
> >+#include "xfs_sb.h"
> >+#include "xfs_inode.h"
> >+#include "xfs_inode_fork.h"
> >+#include "xfs_bmap.h"
> >+#include "xfs_bmap_util.h"
> >+#include "xfs_bmap_btree.h"
> >+#include "xfs_rmap.h"
> >+#include "scrub/common.h"
> >+#include "scrub/btree.h"
> >+
> >+/* Set us up with an inode's bmap. */
> >+STATIC int
> >+__xfs_scrub_setup_inode_bmap(
> >+ struct xfs_scrub_context *sc,
> >+ struct xfs_inode *ip,
> >+ bool flush_data)
> >+{
> >+ struct xfs_mount *mp = sc->mp;
> >+ int error;
> >+
> >+ error = xfs_scrub_get_inode(sc, ip);
> >+ if (error)
> >+ return error;
> >+
> >+ sc->ilock_flags = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
> >+ xfs_ilock(sc->ip, sc->ilock_flags);
> >+
> >+ /*
> >+ * We don't want any ephemeral data fork updates sitting around
> >+ * while we inspect block mappings, so wait for directio to finish
> >+ * and flush dirty data if we have delalloc reservations.
> >+ */
> >+ if (S_ISREG(VFS_I(sc->ip)->i_mode) && flush_data) {
> >+ inode_dio_wait(VFS_I(sc->ip));
> >+ error = filemap_write_and_wait(VFS_I(sc->ip)->i_mapping);
> >+ if (error)
> >+ goto out_unlock;
> >+ error = invalidate_inode_pages2(VFS_I(sc->ip)->i_mapping);
> >+ if (error)
> >+ goto out_unlock;
> >+ }
> >+
> >+ /* Got the inode, lock it and we're ready to go. */
> >+ error = xfs_scrub_trans_alloc(sc->sm, mp, &M_RES(mp)->tr_itruncate,
> >+ 0, 0, 0, &sc->tp);
> >+ if (error)
> >+ goto out_unlock;
> >+ sc->ilock_flags |= XFS_ILOCK_EXCL;
> >+ xfs_ilock(sc->ip, XFS_ILOCK_EXCL);
> >+
> >+ return 0;
> >+out_unlock:
> >+ xfs_iunlock(sc->ip, sc->ilock_flags);
> >+ if (sc->ip != ip)
> >+ IRELE(sc->ip);
> >+ sc->ip = NULL;
> >+ return error;
> >+}
> >+
> >+/* Set us up to scrub the data fork. */
> >+int
> >+xfs_scrub_setup_inode_bmap_data(
> >+ struct xfs_scrub_context *sc,
> >+ struct xfs_inode *ip)
> >+{
> >+ return __xfs_scrub_setup_inode_bmap(sc, ip, true);
> >+}
> >+
> >+/* Set us up to scrub the attr or CoW fork. */
> >+int
> >+xfs_scrub_setup_inode_bmap(
> >+ struct xfs_scrub_context *sc,
> >+ struct xfs_inode *ip)
> >+{
> >+ return __xfs_scrub_setup_inode_bmap(sc, ip, false);
> >+}
> >+
> >+/*
> >+ * Inode fork block mapping (BMBT) scrubber.
> >+ * More complex than the others because we have to scrub
> >+ * all the extents regardless of whether or not the fork
> >+ * is in btree format.
> >+ */
> >+
> >+struct xfs_scrub_bmap_info {
> >+ struct xfs_scrub_context *sc;
> >+ const char *type;
> >+ xfs_daddr_t eofs;
> >+ xfs_fileoff_t lastoff;
> >+ bool is_rt;
> >+ bool is_shared;
> >+ int whichfork;
> >+};
> >+
> >+#define XFS_SCRUB_BMAP_CHECK(fs_ok) \
> >+ XFS_SCRUB_INO_CHECK(info->sc, info->sc->ip->i_ino, bp, info->type, fs_ok)
> >+#define XFS_SCRUB_BMAP_GOTO(fs_ok, label) \
> >+ XFS_SCRUB_INO_GOTO(info->sc, info->sc->ip->i_ino, bp, info->type, fs_ok, label)
> >+#define XFS_SCRUB_BMAP_OP_ERROR_GOTO(label) \
> >+ XFS_SCRUB_OP_ERROR_GOTO(info->sc, agno, 0, "bmap", &error, label)
> >+/* Scrub a single extent record. */
> >+STATIC int
> >+xfs_scrub_bmap_extent(
> >+ struct xfs_inode *ip,
> >+ struct xfs_btree_cur *cur,
> >+ struct xfs_scrub_bmap_info *info,
> >+ struct xfs_bmbt_irec *irec)
> >+{
> >+ struct xfs_scrub_ag sa = { 0 };
> >+ struct xfs_mount *mp = info->sc->mp;
> >+ struct xfs_buf *bp = NULL;
> >+ xfs_daddr_t daddr;
> >+ xfs_daddr_t dlen;
> >+ xfs_fsblock_t bno;
> >+ xfs_agnumber_t agno;
> >+ int error = 0;
> >+
> >+ if (cur)
> >+ xfs_btree_get_block(cur, 0, &bp);
> >+
> >+ XFS_SCRUB_BMAP_CHECK(irec->br_startoff >= info->lastoff);
> >+ XFS_SCRUB_BMAP_CHECK(irec->br_startblock != HOLESTARTBLOCK);
> >+ XFS_SCRUB_BMAP_CHECK(!isnullstartblock(irec->br_startblock));
> >+
> >+ /* Actual mapping, so check the block ranges. */
> >+ if (info->is_rt) {
> >+ daddr = XFS_FSB_TO_BB(mp, irec->br_startblock);
> >+ agno = NULLAGNUMBER;
> >+ bno = irec->br_startblock;
> >+ } else {
> >+ daddr = XFS_FSB_TO_DADDR(mp, irec->br_startblock);
> >+ agno = XFS_FSB_TO_AGNO(mp, irec->br_startblock);
> >+ XFS_SCRUB_BMAP_GOTO(agno < mp->m_sb.sb_agcount, out);
> >+ bno = XFS_FSB_TO_AGBNO(mp, irec->br_startblock);
> >+ XFS_SCRUB_BMAP_CHECK(bno < mp->m_sb.sb_agblocks);
> >+ }
> >+ dlen = XFS_FSB_TO_BB(mp, irec->br_blockcount);
> >+ XFS_SCRUB_BMAP_CHECK(irec->br_blockcount > 0);
> >+ XFS_SCRUB_BMAP_CHECK(irec->br_blockcount <= MAXEXTLEN);
> >+ XFS_SCRUB_BMAP_CHECK(daddr < info->eofs);
> >+ XFS_SCRUB_BMAP_CHECK(daddr + dlen <= info->eofs);
> >+ XFS_SCRUB_BMAP_CHECK(irec->br_state != XFS_EXT_UNWRITTEN ||
> >+ xfs_sb_version_hasextflgbit(&mp->m_sb));
> >+ if (error)
> >+ goto out;
> >+
> >+ /* Set ourselves up for cross-referencing later. */
> >+ if (!info->is_rt) {
> >+ error = xfs_scrub_ag_init(info->sc, agno, &sa);
> >+ XFS_SCRUB_BMAP_OP_ERROR_GOTO(out);
> >+ }
> >+
> >+ xfs_scrub_ag_free(info->sc, &sa);
> >+out:
> >+ info->lastoff = irec->br_startoff + irec->br_blockcount;
> >+ return error;
> >+}
> >+#undef XFS_SCRUB_BMAP_OP_ERROR_GOTO
> >+#undef XFS_SCRUB_BMAP_GOTO
> >+
> >+/* Scrub a bmbt record. */
> >+STATIC int
> >+xfs_scrub_bmapbt_helper(
> >+ struct xfs_scrub_btree *bs,
> >+ union xfs_btree_rec *rec)
> >+{
> >+ struct xfs_bmbt_rec_host ihost;
> >+ struct xfs_bmbt_irec irec;
> >+ struct xfs_scrub_bmap_info *info = bs->private;
> >+ struct xfs_inode *ip = bs->cur->bc_private.b.ip;
> >+ struct xfs_buf *bp = NULL;
> >+ struct xfs_btree_block *block;
> >+ uint64_t owner;
> >+ int i;
> >+
> >+ /*
> >+ * Check the owners of the btree blocks up to the level below
> >+ * the root since the verifiers don't do that.
> >+ */
> >+ if (xfs_sb_version_hascrc(&bs->cur->bc_mp->m_sb) &&
> >+ bs->cur->bc_ptrs[0] == 1) {
> >+ for (i = 0; i < bs->cur->bc_nlevels - 1; i++) {
> >+ block = xfs_btree_get_block(bs->cur, i, &bp);
> >+ owner = be64_to_cpu(block->bb_u.l.bb_owner);
> >+ XFS_SCRUB_BMAP_CHECK(owner == ip->i_ino);
> >+ }
> >+ }
> >+
> >+ /* Set up the in-core record and scrub it. */
> >+ ihost.l0 = be64_to_cpu(rec->bmbt.l0);
> >+ ihost.l1 = be64_to_cpu(rec->bmbt.l1);
> >+ xfs_bmbt_get_all(&ihost, &irec);
> >+ return xfs_scrub_bmap_extent(ip, bs->cur, info, &irec);
> >+}
> >+#undef XFS_SCRUB_BMAP_CHECK
> >+
> >+#define XFS_SCRUB_FORK_CHECK(fs_ok) \
> >+ XFS_SCRUB_INO_CHECK(sc, ip->i_ino, NULL, info.type, fs_ok)
> >+#define XFS_SCRUB_FORK_GOTO(fs_ok, label) \
> >+ XFS_SCRUB_INO_GOTO(sc, ip->i_ino, NULL, info.type, fs_ok, label)
> >+#define XFS_SCRUB_FORK_OP_ERROR_GOTO(label) \
> >+ XFS_SCRUB_OP_ERROR_GOTO(sc, \
> >+ XFS_INO_TO_AGNO(mp, ip->i_ino), \
> >+ XFS_INO_TO_AGBNO(mp, ip->i_ino), \
> >+ info.type, &error, label)
> >+/* Scrub an inode fork's block mappings. */
> >+STATIC int
> >+xfs_scrub_bmap(
> >+ struct xfs_scrub_context *sc,
> >+ int whichfork)
> >+{
> >+ struct xfs_bmbt_irec irec;
> >+ struct xfs_scrub_bmap_info info = {0};
> >+ struct xfs_owner_info oinfo;
> >+ struct xfs_mount *mp = sc->mp;
> >+ struct xfs_inode *ip = sc->ip;
> >+ struct xfs_ifork *ifp;
> >+ struct xfs_btree_cur *cur;
> >+ xfs_fileoff_t endoff;
> >+ xfs_extnum_t idx;
> >+ bool found;
> >+ int error = 0;
> >+ int err2 = 0;
> >+
> >+ switch (whichfork) {
> >+ case XFS_DATA_FORK:
> >+ info.type = "data fork";
> >+ break;
> >+ case XFS_ATTR_FORK:
> >+ info.type = "attr fork";
> >+ break;
> >+ case XFS_COW_FORK:
> >+ info.type = "CoW fork";
> >+ break;
> >+ }
> >+ ifp = XFS_IFORK_PTR(ip, whichfork);
> >+
> >+ info.is_rt = whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip);
> >+ info.eofs = XFS_FSB_TO_BB(mp, info.is_rt ? mp->m_sb.sb_rblocks :
> >+ mp->m_sb.sb_dblocks);
> >+ info.whichfork = whichfork;
> >+ info.is_shared = whichfork == XFS_DATA_FORK && xfs_is_reflink_inode(ip);
> >+ info.sc = sc;
> >+
> >+ switch (whichfork) {
> >+ case XFS_COW_FORK:
> >+ /* Non-existent CoW forks are ignorable. */
> >+ if (!ifp)
> >+ goto out_unlock;
> >+ /* No CoW forks on non-reflink inodes/filesystems. */
> >+ XFS_SCRUB_FORK_GOTO(xfs_is_reflink_inode(ip), out_unlock);
> >+ break;
> >+ case XFS_ATTR_FORK:
> >+ if (!ifp)
> >+ goto out_unlock;
> >+ XFS_SCRUB_FORK_CHECK(xfs_sb_version_hasattr(&mp->m_sb) ||
> >+ xfs_sb_version_hasattr2(&mp->m_sb));
> >+ break;
> >+ }
> >+
> >+ /* Check the fork values */
> >+ switch (XFS_IFORK_FORMAT(ip, whichfork)) {
> >+ case XFS_DINODE_FMT_UUID:
> >+ case XFS_DINODE_FMT_DEV:
> >+ case XFS_DINODE_FMT_LOCAL:
> >+ /* No mappings to check. */
> >+ goto out_unlock;
> >+ case XFS_DINODE_FMT_EXTENTS:
> >+ XFS_SCRUB_FORK_GOTO(ifp->if_flags & XFS_IFEXTENTS, out_unlock);
> >+ break;
> >+ case XFS_DINODE_FMT_BTREE:
> >+ XFS_SCRUB_FORK_CHECK(whichfork != XFS_COW_FORK);
> >+ /* Scan the btree records. */
> >+ cur = xfs_bmbt_init_cursor(mp, sc->tp, ip, whichfork);
> >+ xfs_rmap_ino_bmbt_owner(&oinfo, ip->i_ino, whichfork);
> >+ err2 = xfs_scrub_btree(sc, cur, xfs_scrub_bmapbt_helper,
> >+ &oinfo, &info);
> >+ xfs_btree_del_cursor(cur, err2 ? XFS_BTREE_ERROR :
> >+ XFS_BTREE_NOERROR);
> >+ if (err2 == -EDEADLOCK)
> >+ return err2;
> >+ else if (err2)
> >+ goto out_unlock;
> >+ break;
> >+ default:
> >+ XFS_SCRUB_FORK_GOTO(false, out_unlock);
> >+ break;
> >+ }
> >+
> >+ /* Extent data is in memory, so scrub that. */
> >+
> >+ /* Find the offset of the last extent in the mapping. */
> >+ error = xfs_bmap_last_offset(ip, &endoff, whichfork);
> >+ XFS_SCRUB_FORK_OP_ERROR_GOTO(out_unlock);
> >+
> >+ /* Scrub extent records. */
> >+ info.lastoff = 0;
> >+ ifp = XFS_IFORK_PTR(ip, whichfork);
> >+ for (found = xfs_iext_lookup_extent(ip, ifp, 0, &idx, &irec);
> >+ found;
> Did you mean to have the found; without an assignment here? Not sure if
> that was intentional or a typo.

It's a second-clause-of-a-for-loop null test; I can change it to "found
!= NULL" to be more obvious.

--D

> Otherwise looks good.
> Reviewed by: Allison Henderson <allison.henderson@oracle.com>
> >+ found = xfs_iext_get_extent(ifp, ++idx, &irec)) {
> >+ if (xfs_scrub_should_terminate(&error))
> >+ break;
> >+ if (isnullstartblock(irec.br_startblock))
> >+ continue;
> >+ XFS_SCRUB_FORK_CHECK(irec.br_startoff < endoff);
> >+ err2 = xfs_scrub_bmap_extent(ip, NULL, &info, &irec);
> >+ if (err2 == -EDEADLOCK)
> >+ return err2;
> >+ else if (!error && err2)
> >+ error = err2;
> >+ }
> >+
> >+out_unlock:
> >+ if (error == 0 && err2 != 0)
> >+ error = err2;
> >+ return error;
> >+}
> >+#undef XFS_SCRUB_FORK_CHECK
> >+#undef XFS_SCRUB_FORK_GOTO
> >+
> >+/* Scrub an inode's data fork. */
> >+int
> >+xfs_scrub_bmap_data(
> >+ struct xfs_scrub_context *sc)
> >+{
> >+ return xfs_scrub_bmap(sc, XFS_DATA_FORK);
> >+}
> >+
> >+/* Scrub an inode's attr fork. */
> >+int
> >+xfs_scrub_bmap_attr(
> >+ struct xfs_scrub_context *sc)
> >+{
> >+ return xfs_scrub_bmap(sc, XFS_ATTR_FORK);
> >+}
> >+
> >+/* Scrub an inode's CoW fork. */
> >+int
> >+xfs_scrub_bmap_cow(
> >+ struct xfs_scrub_context *sc)
> >+{
> >+ if (!xfs_is_reflink_inode(sc->ip))
> >+ return -ENOENT;
> >+
> >+ return xfs_scrub_bmap(sc, XFS_COW_FORK);
> >+}
> >diff --git a/fs/xfs/scrub/common.c b/fs/xfs/scrub/common.c
> >index 066fd3e..da3c006 100644
> >--- a/fs/xfs/scrub/common.c
> >+++ b/fs/xfs/scrub/common.c
> >@@ -795,6 +795,18 @@ static const struct xfs_scrub_meta_fns meta_scrub_fns[] = {
> > .setup = xfs_scrub_setup_inode,
> > .scrub = xfs_scrub_inode,
> > },
> >+ { /* inode data fork */
> >+ .setup = xfs_scrub_setup_inode_bmap_data,
> >+ .scrub = xfs_scrub_bmap_data,
> >+ },
> >+ { /* inode attr fork */
> >+ .setup = xfs_scrub_setup_inode_bmap,
> >+ .scrub = xfs_scrub_bmap_attr,
> >+ },
> >+ { /* inode CoW fork */
> >+ .setup = xfs_scrub_setup_inode_bmap,
> >+ .scrub = xfs_scrub_bmap_cow,
> >+ },
> > };
> >
> > /* Dispatch metadata scrubbing. */
> >diff --git a/fs/xfs/scrub/common.h b/fs/xfs/scrub/common.h
> >index 5caa6c9..1025466 100644
> >--- a/fs/xfs/scrub/common.h
> >+++ b/fs/xfs/scrub/common.h
> >@@ -216,6 +216,8 @@ SETUP_FN(xfs_scrub_setup_ag_iallocbt);
> > SETUP_FN(xfs_scrub_setup_ag_rmapbt);
> > SETUP_FN(xfs_scrub_setup_ag_refcountbt);
> > SETUP_FN(xfs_scrub_setup_inode);
> >+SETUP_FN(xfs_scrub_setup_inode_bmap_data);
> >+SETUP_FN(xfs_scrub_setup_inode_bmap);
> > #undef SETUP_FN
> >
> > /* Metadata scrubbers */
> >@@ -234,6 +236,9 @@ SCRUB_FN(xfs_scrub_finobt);
> > SCRUB_FN(xfs_scrub_rmapbt);
> > SCRUB_FN(xfs_scrub_refcountbt);
> > SCRUB_FN(xfs_scrub_inode);
> >+SCRUB_FN(xfs_scrub_bmap_data);
> >+SCRUB_FN(xfs_scrub_bmap_attr);
> >+SCRUB_FN(xfs_scrub_bmap_cow);
> > #undef SCRUB_FN
> >
> > #endif /* __XFS_REPAIR_COMMON_H__ */
> >diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
> >index 950e2c8..edfa4c7 100644
> >--- a/fs/xfs/xfs_trace.h
> >+++ b/fs/xfs/xfs_trace.h
> >@@ -3324,7 +3324,10 @@ DEFINE_GETFSMAP_EVENT(xfs_getfsmap_mapping);
> > { XFS_SCRUB_TYPE_FINOBT, "finobt" }, \
> > { XFS_SCRUB_TYPE_RMAPBT, "rmapbt" }, \
> > { XFS_SCRUB_TYPE_REFCNTBT, "refcountbt" }, \
> >- { XFS_SCRUB_TYPE_INODE, "inode" }
> >+ { XFS_SCRUB_TYPE_INODE, "inode" }, \
> >+ { XFS_SCRUB_TYPE_BMBTD, "bmapbtd" }, \
> >+ { XFS_SCRUB_TYPE_BMBTA, "bmapbta" }, \
> >+ { XFS_SCRUB_TYPE_BMBTC, "bmapbtc" }
> > DECLARE_EVENT_CLASS(xfs_scrub_class,
> > TP_PROTO(struct xfs_inode *ip, struct xfs_scrub_metadata *sm,
> > int error),
> >
> >--
> >To unsubscribe from this list: send the line "unsubscribe linux-xfs" in
> >the body of a message to majordomo@vger.kernel.org
> >More majordomo info at http://vger.kernel.org/majordomo-info.html
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