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linux_dsm_epyc7002/fs/xfs/scrub/rmap.c
Dave Chinner 0b61f8a407 xfs: convert to SPDX license tags 
Remove the verbose license text from XFS files and replace them
with SPDX tags. This does not change the license of any of the code,
merely refers to the common, up-to-date license files in LICENSES/

This change was mostly scripted. fs/xfs/Makefile and
fs/xfs/libxfs/xfs_fs.h were modified by hand, the rest were detected
and modified by the following command:

for f in `git grep -l "GNU General" fs/xfs/` ; do
	echo $f
	cat $f | awk -f hdr.awk > $f.new
	mv -f $f.new $f
done

And the hdr.awk script that did the modification (including
detecting the difference between GPL-2.0 and GPL-2.0+ licenses)
is as follows:

$ cat hdr.awk
BEGIN {
	hdr = 1.0
	tag = "GPL-2.0"
	str = ""
}

/^ \* This program is free software/ {
	hdr = 2.0;
	next
}

/any later version./ {
	tag = "GPL-2.0+"
	next
}

/^ \*\// {
	if (hdr > 0.0) {
		print "// SPDX-License-Identifier: " tag
		print str
		print $0
		str=""
		hdr = 0.0
		next
	}
	print $0
	next
}

/^ \* / {
	if (hdr > 1.0)
		next
	if (hdr > 0.0) {
		if (str != "")
			str = str "\n"
		str = str $0
		next
	}
	print $0
	next
}

/^ \*/ {
	if (hdr > 0.0)
		next
	print $0
	next
}

// {
	if (hdr > 0.0) {
		if (str != "")
			str = str "\n"
		str = str $0
		next
	}
	print $0
}

END { }
$

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2018-06-06 14:17:53 -07:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*/
#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_sb.h"
#include "xfs_alloc.h"
#include "xfs_ialloc.h"
#include "xfs_rmap.h"
#include "xfs_refcount.h"
#include "scrub/xfs_scrub.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/btree.h"
#include "scrub/trace.h"
/*
* Set us up to scrub reverse mapping btrees.
*/
int
xfs_scrub_setup_ag_rmapbt(
struct xfs_scrub_context *sc,
struct xfs_inode *ip)
{
return xfs_scrub_setup_ag_btree(sc, ip, false);
}
/* Reverse-mapping scrubber. */
/* Cross-reference a rmap against the refcount btree. */
STATIC void
xfs_scrub_rmapbt_xref_refc(
struct xfs_scrub_context *sc,
struct xfs_rmap_irec *irec)
{
xfs_agblock_t fbno;
xfs_extlen_t flen;
bool non_inode;
bool is_bmbt;
bool is_attr;
bool is_unwritten;
int error;
if (!sc->sa.refc_cur || xfs_scrub_skip_xref(sc->sm))
return;
non_inode = XFS_RMAP_NON_INODE_OWNER(irec->rm_owner);
is_bmbt = irec->rm_flags & XFS_RMAP_BMBT_BLOCK;
is_attr = irec->rm_flags & XFS_RMAP_ATTR_FORK;
is_unwritten = irec->rm_flags & XFS_RMAP_UNWRITTEN;
/* If this is shared, must be a data fork extent. */
error = xfs_refcount_find_shared(sc->sa.refc_cur, irec->rm_startblock,
irec->rm_blockcount, &fbno, &flen, false);
if (!xfs_scrub_should_check_xref(sc, &error, &sc->sa.refc_cur))
return;
if (flen != 0 && (non_inode || is_attr || is_bmbt || is_unwritten))
xfs_scrub_btree_xref_set_corrupt(sc, sc->sa.refc_cur, 0);
}
/* Cross-reference with the other btrees. */
STATIC void
xfs_scrub_rmapbt_xref(
struct xfs_scrub_context *sc,
struct xfs_rmap_irec *irec)
{
xfs_agblock_t agbno = irec->rm_startblock;
xfs_extlen_t len = irec->rm_blockcount;
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
return;
xfs_scrub_xref_is_used_space(sc, agbno, len);
if (irec->rm_owner == XFS_RMAP_OWN_INODES)
xfs_scrub_xref_is_inode_chunk(sc, agbno, len);
else
xfs_scrub_xref_is_not_inode_chunk(sc, agbno, len);
if (irec->rm_owner == XFS_RMAP_OWN_COW)
xfs_scrub_xref_is_cow_staging(sc, irec->rm_startblock,
irec->rm_blockcount);
else
xfs_scrub_rmapbt_xref_refc(sc, irec);
}
/* Scrub an rmapbt record. */
STATIC int
xfs_scrub_rmapbt_rec(
struct xfs_scrub_btree *bs,
union xfs_btree_rec *rec)
{
struct xfs_mount *mp = bs->cur->bc_mp;
struct xfs_rmap_irec irec;
xfs_agnumber_t agno = bs->cur->bc_private.a.agno;
bool non_inode;
bool is_unwritten;
bool is_bmbt;
bool is_attr;
int error;
error = xfs_rmap_btrec_to_irec(rec, &irec);
if (!xfs_scrub_btree_process_error(bs->sc, bs->cur, 0, &error))
goto out;
/* Check extent. */
if (irec.rm_startblock + irec.rm_blockcount <= irec.rm_startblock)
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
if (irec.rm_owner == XFS_RMAP_OWN_FS) {
/*
* xfs_verify_agbno returns false for static fs metadata.
* Since that only exists at the start of the AG, validate
* that by hand.
*/
if (irec.rm_startblock != 0 ||
irec.rm_blockcount != XFS_AGFL_BLOCK(mp) + 1)
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
} else {
/*
* Otherwise we must point somewhere past the static metadata
* but before the end of the FS. Run the regular check.
*/
if (!xfs_verify_agbno(mp, agno, irec.rm_startblock) ||
!xfs_verify_agbno(mp, agno, irec.rm_startblock +
irec.rm_blockcount - 1))
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
}
/* Check flags. */
non_inode = XFS_RMAP_NON_INODE_OWNER(irec.rm_owner);
is_bmbt = irec.rm_flags & XFS_RMAP_BMBT_BLOCK;
is_attr = irec.rm_flags & XFS_RMAP_ATTR_FORK;
is_unwritten = irec.rm_flags & XFS_RMAP_UNWRITTEN;
if (is_bmbt && irec.rm_offset != 0)
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
if (non_inode && irec.rm_offset != 0)
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
if (is_unwritten && (is_bmbt || non_inode || is_attr))
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
if (non_inode && (is_bmbt || is_unwritten || is_attr))
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
if (!non_inode) {
if (!xfs_verify_ino(mp, irec.rm_owner))
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
} else {
/* Non-inode owner within the magic values? */
if (irec.rm_owner <= XFS_RMAP_OWN_MIN ||
irec.rm_owner > XFS_RMAP_OWN_FS)
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
}
xfs_scrub_rmapbt_xref(bs->sc, &irec);
out:
return error;
}
/* Scrub the rmap btree for some AG. */
int
xfs_scrub_rmapbt(
struct xfs_scrub_context *sc)
{
struct xfs_owner_info oinfo;
xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_AG);
return xfs_scrub_btree(sc, sc->sa.rmap_cur, xfs_scrub_rmapbt_rec,
&oinfo, NULL);
}
/* xref check that the extent is owned by a given owner */
static inline void
xfs_scrub_xref_check_owner(
struct xfs_scrub_context *sc,
xfs_agblock_t bno,
xfs_extlen_t len,
struct xfs_owner_info *oinfo,
bool should_have_rmap)
{
bool has_rmap;
int error;
if (!sc->sa.rmap_cur || xfs_scrub_skip_xref(sc->sm))
return;
error = xfs_rmap_record_exists(sc->sa.rmap_cur, bno, len, oinfo,
&has_rmap);
if (!xfs_scrub_should_check_xref(sc, &error, &sc->sa.rmap_cur))
return;
if (has_rmap != should_have_rmap)
xfs_scrub_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
}
/* xref check that the extent is owned by a given owner */
void
xfs_scrub_xref_is_owned_by(
struct xfs_scrub_context *sc,
xfs_agblock_t bno,
xfs_extlen_t len,
struct xfs_owner_info *oinfo)
{
xfs_scrub_xref_check_owner(sc, bno, len, oinfo, true);
}
/* xref check that the extent is not owned by a given owner */
void
xfs_scrub_xref_is_not_owned_by(
struct xfs_scrub_context *sc,
xfs_agblock_t bno,
xfs_extlen_t len,
struct xfs_owner_info *oinfo)
{
xfs_scrub_xref_check_owner(sc, bno, len, oinfo, false);
}
/* xref check that the extent has no reverse mapping at all */
void
xfs_scrub_xref_has_no_owner(
struct xfs_scrub_context *sc,
xfs_agblock_t bno,
xfs_extlen_t len)
{
bool has_rmap;
int error;
if (!sc->sa.rmap_cur || xfs_scrub_skip_xref(sc->sm))
return;
error = xfs_rmap_has_record(sc->sa.rmap_cur, bno, len, &has_rmap);
if (!xfs_scrub_should_check_xref(sc, &error, &sc->sa.rmap_cur))
return;
if (has_rmap)
xfs_scrub_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
}
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