1 files changed, 552 insertions, 0 deletions

diff --git a/fs/xfs/xfs_inode_item_recover.c b/fs/xfs/xfs_inode_item_recover.c
new file mode 100644
index 000000000..e6609067e
--- /dev/null
+++ b/fs/xfs/xfs_inode_item_recover.c
@@ -0,0 +1,552 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_inode.h"
+#include "xfs_trans.h"
+#include "xfs_inode_item.h"
+#include "xfs_trace.h"
+#include "xfs_trans_priv.h"
+#include "xfs_buf_item.h"
+#include "xfs_log.h"
+#include "xfs_error.h"
+#include "xfs_log_priv.h"
+#include "xfs_log_recover.h"
+#include "xfs_icache.h"
+#include "xfs_bmap_btree.h"
+
+STATIC void
+xlog_recover_inode_ra_pass2(
+	struct xlog                     *log,
+	struct xlog_recover_item        *item)
+{
+	if (item->ri_buf[0].i_len == sizeof(struct xfs_inode_log_format)) {
+		struct xfs_inode_log_format	*ilfp = item->ri_buf[0].i_addr;
+
+		xlog_buf_readahead(log, ilfp->ilf_blkno, ilfp->ilf_len,
+				   &xfs_inode_buf_ra_ops);
+	} else {
+		struct xfs_inode_log_format_32	*ilfp = item->ri_buf[0].i_addr;
+
+		xlog_buf_readahead(log, ilfp->ilf_blkno, ilfp->ilf_len,
+				   &xfs_inode_buf_ra_ops);
+	}
+}
+
+/*
+ * Inode fork owner changes
+ *
+ * If we have been told that we have to reparent the inode fork, it's because an
+ * extent swap operation on a CRC enabled filesystem has been done and we are
+ * replaying it. We need to walk the BMBT of the appropriate fork and change the
+ * owners of it.
+ *
+ * The complexity here is that we don't have an inode context to work with, so
+ * after we've replayed the inode we need to instantiate one.  This is where the
+ * fun begins.
+ *
+ * We are in the middle of log recovery, so we can't run transactions. That
+ * means we cannot use cache coherent inode instantiation via xfs_iget(), as
+ * that will result in the corresponding iput() running the inode through
+ * xfs_inactive(). If we've just replayed an inode core that changes the link
+ * count to zero (i.e. it's been unlinked), then xfs_inactive() will run
+ * transactions (bad!).
+ *
+ * So, to avoid this, we instantiate an inode directly from the inode core we've
+ * just recovered. We have the buffer still locked, and all we really need to
+ * instantiate is the inode core and the forks being modified. We can do this
+ * manually, then run the inode btree owner change, and then tear down the
+ * xfs_inode without having to run any transactions at all.
+ *
+ * Also, because we don't have a transaction context available here but need to
+ * gather all the buffers we modify for writeback so we pass the buffer_list
+ * instead for the operation to use.
+ */
+
+STATIC int
+xfs_recover_inode_owner_change(
+	struct xfs_mount	*mp,
+	struct xfs_dinode	*dip,
+	struct xfs_inode_log_format *in_f,
+	struct list_head	*buffer_list)
+{
+	struct xfs_inode	*ip;
+	int			error;
+
+	ASSERT(in_f->ilf_fields & (XFS_ILOG_DOWNER|XFS_ILOG_AOWNER));
+
+	ip = xfs_inode_alloc(mp, in_f->ilf_ino);
+	if (!ip)
+		return -ENOMEM;
+
+	/* instantiate the inode */
+	ASSERT(dip->di_version >= 3);
+
+	error = xfs_inode_from_disk(ip, dip);
+	if (error)
+		goto out_free_ip;
+
+	if (in_f->ilf_fields & XFS_ILOG_DOWNER) {
+		ASSERT(in_f->ilf_fields & XFS_ILOG_DBROOT);
+		error = xfs_bmbt_change_owner(NULL, ip, XFS_DATA_FORK,
+					      ip->i_ino, buffer_list);
+		if (error)
+			goto out_free_ip;
+	}
+
+	if (in_f->ilf_fields & XFS_ILOG_AOWNER) {
+		ASSERT(in_f->ilf_fields & XFS_ILOG_ABROOT);
+		error = xfs_bmbt_change_owner(NULL, ip, XFS_ATTR_FORK,
+					      ip->i_ino, buffer_list);
+		if (error)
+			goto out_free_ip;
+	}
+
+out_free_ip:
+	xfs_inode_free(ip);
+	return error;
+}
+
+static inline bool xfs_log_dinode_has_bigtime(const struct xfs_log_dinode *ld)
+{
+	return ld->di_version >= 3 &&
+	       (ld->di_flags2 & XFS_DIFLAG2_BIGTIME);
+}
+
+/* Convert a log timestamp to an ondisk timestamp. */
+static inline xfs_timestamp_t
+xfs_log_dinode_to_disk_ts(
+	struct xfs_log_dinode		*from,
+	const xfs_log_timestamp_t	its)
+{
+	struct xfs_legacy_timestamp	*lts;
+	struct xfs_log_legacy_timestamp	*lits;
+	xfs_timestamp_t			ts;
+
+	if (xfs_log_dinode_has_bigtime(from))
+		return cpu_to_be64(its);
+
+	lts = (struct xfs_legacy_timestamp *)&ts;
+	lits = (struct xfs_log_legacy_timestamp *)&its;
+	lts->t_sec = cpu_to_be32(lits->t_sec);
+	lts->t_nsec = cpu_to_be32(lits->t_nsec);
+
+	return ts;
+}
+
+static inline bool xfs_log_dinode_has_large_extent_counts(
+		const struct xfs_log_dinode *ld)
+{
+	return ld->di_version >= 3 &&
+	       (ld->di_flags2 & XFS_DIFLAG2_NREXT64);
+}
+
+static inline void
+xfs_log_dinode_to_disk_iext_counters(
+	struct xfs_log_dinode	*from,
+	struct xfs_dinode	*to)
+{
+	if (xfs_log_dinode_has_large_extent_counts(from)) {
+		to->di_big_nextents = cpu_to_be64(from->di_big_nextents);
+		to->di_big_anextents = cpu_to_be32(from->di_big_anextents);
+		to->di_nrext64_pad = cpu_to_be16(from->di_nrext64_pad);
+	} else {
+		to->di_nextents = cpu_to_be32(from->di_nextents);
+		to->di_anextents = cpu_to_be16(from->di_anextents);
+	}
+
+}
+
+STATIC void
+xfs_log_dinode_to_disk(
+	struct xfs_log_dinode	*from,
+	struct xfs_dinode	*to,
+	xfs_lsn_t		lsn)
+{
+	to->di_magic = cpu_to_be16(from->di_magic);
+	to->di_mode = cpu_to_be16(from->di_mode);
+	to->di_version = from->di_version;
+	to->di_format = from->di_format;
+	to->di_onlink = 0;
+	to->di_uid = cpu_to_be32(from->di_uid);
+	to->di_gid = cpu_to_be32(from->di_gid);
+	to->di_nlink = cpu_to_be32(from->di_nlink);
+	to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
+	to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
+
+	to->di_atime = xfs_log_dinode_to_disk_ts(from, from->di_atime);
+	to->di_mtime = xfs_log_dinode_to_disk_ts(from, from->di_mtime);
+	to->di_ctime = xfs_log_dinode_to_disk_ts(from, from->di_ctime);
+
+	to->di_size = cpu_to_be64(from->di_size);
+	to->di_nblocks = cpu_to_be64(from->di_nblocks);
+	to->di_extsize = cpu_to_be32(from->di_extsize);
+	to->di_forkoff = from->di_forkoff;
+	to->di_aformat = from->di_aformat;
+	to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
+	to->di_dmstate = cpu_to_be16(from->di_dmstate);
+	to->di_flags = cpu_to_be16(from->di_flags);
+	to->di_gen = cpu_to_be32(from->di_gen);
+
+	if (from->di_version == 3) {
+		to->di_changecount = cpu_to_be64(from->di_changecount);
+		to->di_crtime = xfs_log_dinode_to_disk_ts(from,
+							  from->di_crtime);
+		to->di_flags2 = cpu_to_be64(from->di_flags2);
+		to->di_cowextsize = cpu_to_be32(from->di_cowextsize);
+		to->di_ino = cpu_to_be64(from->di_ino);
+		to->di_lsn = cpu_to_be64(lsn);
+		memset(to->di_pad2, 0, sizeof(to->di_pad2));
+		uuid_copy(&to->di_uuid, &from->di_uuid);
+		to->di_v3_pad = 0;
+	} else {
+		to->di_flushiter = cpu_to_be16(from->di_flushiter);
+		memset(to->di_v2_pad, 0, sizeof(to->di_v2_pad));
+	}
+
+	xfs_log_dinode_to_disk_iext_counters(from, to);
+}
+
+STATIC int
+xlog_dinode_verify_extent_counts(
+	struct xfs_mount	*mp,
+	struct xfs_log_dinode	*ldip)
+{
+	xfs_extnum_t		nextents;
+	xfs_aextnum_t		anextents;
+
+	if (xfs_log_dinode_has_large_extent_counts(ldip)) {
+		if (!xfs_has_large_extent_counts(mp) ||
+		    (ldip->di_nrext64_pad != 0)) {
+			XFS_CORRUPTION_ERROR(
+				"Bad log dinode large extent count format",
+				XFS_ERRLEVEL_LOW, mp, ldip, sizeof(*ldip));
+			xfs_alert(mp,
+				"Bad inode 0x%llx, large extent counts %d, padding 0x%x",
+				ldip->di_ino, xfs_has_large_extent_counts(mp),
+				ldip->di_nrext64_pad);
+			return -EFSCORRUPTED;
+		}
+
+		nextents = ldip->di_big_nextents;
+		anextents = ldip->di_big_anextents;
+	} else {
+		if (ldip->di_version == 3 && ldip->di_v3_pad != 0) {
+			XFS_CORRUPTION_ERROR(
+				"Bad log dinode di_v3_pad",
+				XFS_ERRLEVEL_LOW, mp, ldip, sizeof(*ldip));
+			xfs_alert(mp,
+				"Bad inode 0x%llx, di_v3_pad 0x%llx",
+				ldip->di_ino, ldip->di_v3_pad);
+			return -EFSCORRUPTED;
+		}
+
+		nextents = ldip->di_nextents;
+		anextents = ldip->di_anextents;
+	}
+
+	if (unlikely(nextents + anextents > ldip->di_nblocks)) {
+		XFS_CORRUPTION_ERROR("Bad log dinode extent counts",
+				XFS_ERRLEVEL_LOW, mp, ldip, sizeof(*ldip));
+		xfs_alert(mp,
+			"Bad inode 0x%llx, large extent counts %d, nextents 0x%llx, anextents 0x%x, nblocks 0x%llx",
+			ldip->di_ino, xfs_has_large_extent_counts(mp), nextents,
+			anextents, ldip->di_nblocks);
+		return -EFSCORRUPTED;
+	}
+
+	return 0;
+}
+
+STATIC int
+xlog_recover_inode_commit_pass2(
+	struct xlog			*log,
+	struct list_head		*buffer_list,
+	struct xlog_recover_item	*item,
+	xfs_lsn_t			current_lsn)
+{
+	struct xfs_inode_log_format	*in_f;
+	struct xfs_mount		*mp = log->l_mp;
+	struct xfs_buf			*bp;
+	struct xfs_dinode		*dip;
+	int				len;
+	char				*src;
+	char				*dest;
+	int				error;
+	int				attr_index;
+	uint				fields;
+	struct xfs_log_dinode		*ldip;
+	uint				isize;
+	int				need_free = 0;
+
+	if (item->ri_buf[0].i_len == sizeof(struct xfs_inode_log_format)) {
+		in_f = item->ri_buf[0].i_addr;
+	} else {
+		in_f = kmem_alloc(sizeof(struct xfs_inode_log_format), 0);
+		need_free = 1;
+		error = xfs_inode_item_format_convert(&item->ri_buf[0], in_f);
+		if (error)
+			goto error;
+	}
+
+	/*
+	 * Inode buffers can be freed, look out for it,
+	 * and do not replay the inode.
+	 */
+	if (xlog_is_buffer_cancelled(log, in_f->ilf_blkno, in_f->ilf_len)) {
+		error = 0;
+		trace_xfs_log_recover_inode_cancel(log, in_f);
+		goto error;
+	}
+	trace_xfs_log_recover_inode_recover(log, in_f);
+
+	error = xfs_buf_read(mp->m_ddev_targp, in_f->ilf_blkno, in_f->ilf_len,
+			0, &bp, &xfs_inode_buf_ops);
+	if (error)
+		goto error;
+	ASSERT(in_f->ilf_fields & XFS_ILOG_CORE);
+	dip = xfs_buf_offset(bp, in_f->ilf_boffset);
+
+	/*
+	 * Make sure the place we're flushing out to really looks
+	 * like an inode!
+	 */
+	if (XFS_IS_CORRUPT(mp, !xfs_verify_magic16(bp, dip->di_magic))) {
+		xfs_alert(mp,
+	"%s: Bad inode magic number, dip = "PTR_FMT", dino bp = "PTR_FMT", ino = %lld",
+			__func__, dip, bp, in_f->ilf_ino);
+		error = -EFSCORRUPTED;
+		goto out_release;
+	}
+	ldip = item->ri_buf[1].i_addr;
+	if (XFS_IS_CORRUPT(mp, ldip->di_magic != XFS_DINODE_MAGIC)) {
+		xfs_alert(mp,
+			"%s: Bad inode log record, rec ptr "PTR_FMT", ino %lld",
+			__func__, item, in_f->ilf_ino);
+		error = -EFSCORRUPTED;
+		goto out_release;
+	}
+
+	/*
+	 * If the inode has an LSN in it, recover the inode only if the on-disk
+	 * inode's LSN is older than the lsn of the transaction we are
+	 * replaying. We can have multiple checkpoints with the same start LSN,
+	 * so the current LSN being equal to the on-disk LSN doesn't necessarily
+	 * mean that the on-disk inode is more recent than the change being
+	 * replayed.
+	 *
+	 * We must check the current_lsn against the on-disk inode
+	 * here because the we can't trust the log dinode to contain a valid LSN
+	 * (see comment below before replaying the log dinode for details).
+	 *
+	 * Note: we still need to replay an owner change even though the inode
+	 * is more recent than the transaction as there is no guarantee that all
+	 * the btree blocks are more recent than this transaction, too.
+	 */
+	if (dip->di_version >= 3) {
+		xfs_lsn_t	lsn = be64_to_cpu(dip->di_lsn);
+
+		if (lsn && lsn != -1 && XFS_LSN_CMP(lsn, current_lsn) > 0) {
+			trace_xfs_log_recover_inode_skip(log, in_f);
+			error = 0;
+			goto out_owner_change;
+		}
+	}
+
+	/*
+	 * di_flushiter is only valid for v1/2 inodes. All changes for v3 inodes
+	 * are transactional and if ordering is necessary we can determine that
+	 * more accurately by the LSN field in the V3 inode core. Don't trust
+	 * the inode versions we might be changing them here - use the
+	 * superblock flag to determine whether we need to look at di_flushiter
+	 * to skip replay when the on disk inode is newer than the log one
+	 */
+	if (!xfs_has_v3inodes(mp)) {
+		if (ldip->di_flushiter < be16_to_cpu(dip->di_flushiter)) {
+			/*
+			 * Deal with the wrap case, DI_MAX_FLUSH is less
+			 * than smaller numbers
+			 */
+			if (be16_to_cpu(dip->di_flushiter) == DI_MAX_FLUSH &&
+			    ldip->di_flushiter < (DI_MAX_FLUSH >> 1)) {
+				/* do nothing */
+			} else {
+				trace_xfs_log_recover_inode_skip(log, in_f);
+				error = 0;
+				goto out_release;
+			}
+		}
+
+		/* Take the opportunity to reset the flush iteration count */
+		ldip->di_flushiter = 0;
+	}
+
+
+	if (unlikely(S_ISREG(ldip->di_mode))) {
+		if ((ldip->di_format != XFS_DINODE_FMT_EXTENTS) &&
+		    (ldip->di_format != XFS_DINODE_FMT_BTREE)) {
+			XFS_CORRUPTION_ERROR(
+				"Bad log dinode data fork format for regular file",
+				XFS_ERRLEVEL_LOW, mp, ldip, sizeof(*ldip));
+			xfs_alert(mp,
+				"Bad inode 0x%llx, data fork format 0x%x",
+				in_f->ilf_ino, ldip->di_format);
+			error = -EFSCORRUPTED;
+			goto out_release;
+		}
+	} else if (unlikely(S_ISDIR(ldip->di_mode))) {
+		if ((ldip->di_format != XFS_DINODE_FMT_EXTENTS) &&
+		    (ldip->di_format != XFS_DINODE_FMT_BTREE) &&
+		    (ldip->di_format != XFS_DINODE_FMT_LOCAL)) {
+			XFS_CORRUPTION_ERROR(
+				"Bad log dinode data fork format for directory",
+				XFS_ERRLEVEL_LOW, mp, ldip, sizeof(*ldip));
+			xfs_alert(mp,
+				"Bad inode 0x%llx, data fork format 0x%x",
+				in_f->ilf_ino, ldip->di_format);
+			error = -EFSCORRUPTED;
+			goto out_release;
+		}
+	}
+
+	error = xlog_dinode_verify_extent_counts(mp, ldip);
+	if (error)
+		goto out_release;
+
+	if (unlikely(ldip->di_forkoff > mp->m_sb.sb_inodesize)) {
+		XFS_CORRUPTION_ERROR("Bad log dinode fork offset",
+				XFS_ERRLEVEL_LOW, mp, ldip, sizeof(*ldip));
+		xfs_alert(mp,
+			"Bad inode 0x%llx, di_forkoff 0x%x",
+			in_f->ilf_ino, ldip->di_forkoff);
+		error = -EFSCORRUPTED;
+		goto out_release;
+	}
+	isize = xfs_log_dinode_size(mp);
+	if (unlikely(item->ri_buf[1].i_len > isize)) {
+		XFS_CORRUPTION_ERROR("Bad log dinode size", XFS_ERRLEVEL_LOW,
+				     mp, ldip, sizeof(*ldip));
+		xfs_alert(mp,
+			"Bad inode 0x%llx log dinode size 0x%x",
+			in_f->ilf_ino, item->ri_buf[1].i_len);
+		error = -EFSCORRUPTED;
+		goto out_release;
+	}
+
+	/*
+	 * Recover the log dinode inode into the on disk inode.
+	 *
+	 * The LSN in the log dinode is garbage - it can be zero or reflect
+	 * stale in-memory runtime state that isn't coherent with the changes
+	 * logged in this transaction or the changes written to the on-disk
+	 * inode.  Hence we write the current lSN into the inode because that
+	 * matches what xfs_iflush() would write inode the inode when flushing
+	 * the changes in this transaction.
+	 */
+	xfs_log_dinode_to_disk(ldip, dip, current_lsn);
+
+	fields = in_f->ilf_fields;
+	if (fields & XFS_ILOG_DEV)
+		xfs_dinode_put_rdev(dip, in_f->ilf_u.ilfu_rdev);
+
+	if (in_f->ilf_size == 2)
+		goto out_owner_change;
+	len = item->ri_buf[2].i_len;
+	src = item->ri_buf[2].i_addr;
+	ASSERT(in_f->ilf_size <= 4);
+	ASSERT((in_f->ilf_size == 3) || (fields & XFS_ILOG_AFORK));
+	ASSERT(!(fields & XFS_ILOG_DFORK) ||
+	       (len == xlog_calc_iovec_len(in_f->ilf_dsize)));
+
+	switch (fields & XFS_ILOG_DFORK) {
+	case XFS_ILOG_DDATA:
+	case XFS_ILOG_DEXT:
+		memcpy(XFS_DFORK_DPTR(dip), src, len);
+		break;
+
+	case XFS_ILOG_DBROOT:
+		xfs_bmbt_to_bmdr(mp, (struct xfs_btree_block *)src, len,
+				 (struct xfs_bmdr_block *)XFS_DFORK_DPTR(dip),
+				 XFS_DFORK_DSIZE(dip, mp));
+		break;
+
+	default:
+		/*
+		 * There are no data fork flags set.
+		 */
+		ASSERT((fields & XFS_ILOG_DFORK) == 0);
+		break;
+	}
+
+	/*
+	 * If we logged any attribute data, recover it.  There may or
+	 * may not have been any other non-core data logged in this
+	 * transaction.
+	 */
+	if (in_f->ilf_fields & XFS_ILOG_AFORK) {
+		if (in_f->ilf_fields & XFS_ILOG_DFORK) {
+			attr_index = 3;
+		} else {
+			attr_index = 2;
+		}
+		len = item->ri_buf[attr_index].i_len;
+		src = item->ri_buf[attr_index].i_addr;
+		ASSERT(len == xlog_calc_iovec_len(in_f->ilf_asize));
+
+		switch (in_f->ilf_fields & XFS_ILOG_AFORK) {
+		case XFS_ILOG_ADATA:
+		case XFS_ILOG_AEXT:
+			dest = XFS_DFORK_APTR(dip);
+			ASSERT(len <= XFS_DFORK_ASIZE(dip, mp));
+			memcpy(dest, src, len);
+			break;
+
+		case XFS_ILOG_ABROOT:
+			dest = XFS_DFORK_APTR(dip);
+			xfs_bmbt_to_bmdr(mp, (struct xfs_btree_block *)src,
+					 len, (struct xfs_bmdr_block *)dest,
+					 XFS_DFORK_ASIZE(dip, mp));
+			break;
+
+		default:
+			xfs_warn(log->l_mp, "%s: Invalid flag", __func__);
+			ASSERT(0);
+			error = -EFSCORRUPTED;
+			goto out_release;
+		}
+	}
+
+out_owner_change:
+	/* Recover the swapext owner change unless inode has been deleted */
+	if ((in_f->ilf_fields & (XFS_ILOG_DOWNER|XFS_ILOG_AOWNER)) &&
+	    (dip->di_mode != 0))
+		error = xfs_recover_inode_owner_change(mp, dip, in_f,
+						       buffer_list);
+	/* re-generate the checksum. */
+	xfs_dinode_calc_crc(log->l_mp, dip);
+
+	ASSERT(bp->b_mount == mp);
+	bp->b_flags |= _XBF_LOGRECOVERY;
+	xfs_buf_delwri_queue(bp, buffer_list);
+
+out_release:
+	xfs_buf_relse(bp);
+error:
+	if (need_free)
+		kmem_free(in_f);
+	return error;
+}
+
+const struct xlog_recover_item_ops xlog_inode_item_ops = {
+	.item_type		= XFS_LI_INODE,
+	.ra_pass2		= xlog_recover_inode_ra_pass2,
+	.commit_pass2		= xlog_recover_inode_commit_pass2,
+};