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-rw-r--r--fs/xfs/xfs_rmap_item.c536
1 files changed, 536 insertions, 0 deletions
diff --git a/fs/xfs/xfs_rmap_item.c b/fs/xfs/xfs_rmap_item.c
new file mode 100644
index 000000000000..2500f28689d5
--- /dev/null
+++ b/fs/xfs/xfs_rmap_item.c
@@ -0,0 +1,536 @@
+/*
+ * Copyright (C) 2016 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_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_bit.h"
+#include "xfs_mount.h"
+#include "xfs_defer.h"
+#include "xfs_trans.h"
+#include "xfs_trans_priv.h"
+#include "xfs_buf_item.h"
+#include "xfs_rmap_item.h"
+#include "xfs_log.h"
+#include "xfs_rmap.h"
+
+
+kmem_zone_t *xfs_rui_zone;
+kmem_zone_t *xfs_rud_zone;
+
+static inline struct xfs_rui_log_item *RUI_ITEM(struct xfs_log_item *lip)
+{
+ return container_of(lip, struct xfs_rui_log_item, rui_item);
+}
+
+void
+xfs_rui_item_free(
+ struct xfs_rui_log_item *ruip)
+{
+ if (ruip->rui_format.rui_nextents > XFS_RUI_MAX_FAST_EXTENTS)
+ kmem_free(ruip);
+ else
+ kmem_zone_free(xfs_rui_zone, ruip);
+}
+
+/*
+ * This returns the number of iovecs needed to log the given rui item.
+ * We only need 1 iovec for an rui item. It just logs the rui_log_format
+ * structure.
+ */
+static inline int
+xfs_rui_item_sizeof(
+ struct xfs_rui_log_item *ruip)
+{
+ return sizeof(struct xfs_rui_log_format) +
+ (ruip->rui_format.rui_nextents - 1) *
+ sizeof(struct xfs_map_extent);
+}
+
+STATIC void
+xfs_rui_item_size(
+ struct xfs_log_item *lip,
+ int *nvecs,
+ int *nbytes)
+{
+ *nvecs += 1;
+ *nbytes += xfs_rui_item_sizeof(RUI_ITEM(lip));
+}
+
+/*
+ * This is called to fill in the vector of log iovecs for the
+ * given rui log item. We use only 1 iovec, and we point that
+ * at the rui_log_format structure embedded in the rui item.
+ * It is at this point that we assert that all of the extent
+ * slots in the rui item have been filled.
+ */
+STATIC void
+xfs_rui_item_format(
+ struct xfs_log_item *lip,
+ struct xfs_log_vec *lv)
+{
+ struct xfs_rui_log_item *ruip = RUI_ITEM(lip);
+ struct xfs_log_iovec *vecp = NULL;
+
+ ASSERT(atomic_read(&ruip->rui_next_extent) ==
+ ruip->rui_format.rui_nextents);
+
+ ruip->rui_format.rui_type = XFS_LI_RUI;
+ ruip->rui_format.rui_size = 1;
+
+ xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_RUI_FORMAT, &ruip->rui_format,
+ xfs_rui_item_sizeof(ruip));
+}
+
+/*
+ * Pinning has no meaning for an rui item, so just return.
+ */
+STATIC void
+xfs_rui_item_pin(
+ struct xfs_log_item *lip)
+{
+}
+
+/*
+ * The unpin operation is the last place an RUI is manipulated in the log. It is
+ * either inserted in the AIL or aborted in the event of a log I/O error. In
+ * either case, the RUI transaction has been successfully committed to make it
+ * this far. Therefore, we expect whoever committed the RUI to either construct
+ * and commit the RUD or drop the RUD's reference in the event of error. Simply
+ * drop the log's RUI reference now that the log is done with it.
+ */
+STATIC void
+xfs_rui_item_unpin(
+ struct xfs_log_item *lip,
+ int remove)
+{
+ struct xfs_rui_log_item *ruip = RUI_ITEM(lip);
+
+ xfs_rui_release(ruip);
+}
+
+/*
+ * RUI items have no locking or pushing. However, since RUIs are pulled from
+ * the AIL when their corresponding RUDs are committed to disk, their situation
+ * is very similar to being pinned. Return XFS_ITEM_PINNED so that the caller
+ * will eventually flush the log. This should help in getting the RUI out of
+ * the AIL.
+ */
+STATIC uint
+xfs_rui_item_push(
+ struct xfs_log_item *lip,
+ struct list_head *buffer_list)
+{
+ return XFS_ITEM_PINNED;
+}
+
+/*
+ * The RUI has been either committed or aborted if the transaction has been
+ * cancelled. If the transaction was cancelled, an RUD isn't going to be
+ * constructed and thus we free the RUI here directly.
+ */
+STATIC void
+xfs_rui_item_unlock(
+ struct xfs_log_item *lip)
+{
+ if (lip->li_flags & XFS_LI_ABORTED)
+ xfs_rui_item_free(RUI_ITEM(lip));
+}
+
+/*
+ * The RUI is logged only once and cannot be moved in the log, so simply return
+ * the lsn at which it's been logged.
+ */
+STATIC xfs_lsn_t
+xfs_rui_item_committed(
+ struct xfs_log_item *lip,
+ xfs_lsn_t lsn)
+{
+ return lsn;
+}
+
+/*
+ * The RUI dependency tracking op doesn't do squat. It can't because
+ * it doesn't know where the free extent is coming from. The dependency
+ * tracking has to be handled by the "enclosing" metadata object. For
+ * example, for inodes, the inode is locked throughout the extent freeing
+ * so the dependency should be recorded there.
+ */
+STATIC void
+xfs_rui_item_committing(
+ struct xfs_log_item *lip,
+ xfs_lsn_t lsn)
+{
+}
+
+/*
+ * This is the ops vector shared by all rui log items.
+ */
+static const struct xfs_item_ops xfs_rui_item_ops = {
+ .iop_size = xfs_rui_item_size,
+ .iop_format = xfs_rui_item_format,
+ .iop_pin = xfs_rui_item_pin,
+ .iop_unpin = xfs_rui_item_unpin,
+ .iop_unlock = xfs_rui_item_unlock,
+ .iop_committed = xfs_rui_item_committed,
+ .iop_push = xfs_rui_item_push,
+ .iop_committing = xfs_rui_item_committing,
+};
+
+/*
+ * Allocate and initialize an rui item with the given number of extents.
+ */
+struct xfs_rui_log_item *
+xfs_rui_init(
+ struct xfs_mount *mp,
+ uint nextents)
+
+{
+ struct xfs_rui_log_item *ruip;
+ uint size;
+
+ ASSERT(nextents > 0);
+ if (nextents > XFS_RUI_MAX_FAST_EXTENTS) {
+ size = (uint)(sizeof(struct xfs_rui_log_item) +
+ ((nextents - 1) * sizeof(struct xfs_map_extent)));
+ ruip = kmem_zalloc(size, KM_SLEEP);
+ } else {
+ ruip = kmem_zone_zalloc(xfs_rui_zone, KM_SLEEP);
+ }
+
+ xfs_log_item_init(mp, &ruip->rui_item, XFS_LI_RUI, &xfs_rui_item_ops);
+ ruip->rui_format.rui_nextents = nextents;
+ ruip->rui_format.rui_id = (uintptr_t)(void *)ruip;
+ atomic_set(&ruip->rui_next_extent, 0);
+ atomic_set(&ruip->rui_refcount, 2);
+
+ return ruip;
+}
+
+/*
+ * Copy an RUI format buffer from the given buf, and into the destination
+ * RUI format structure. The RUI/RUD items were designed not to need any
+ * special alignment handling.
+ */
+int
+xfs_rui_copy_format(
+ struct xfs_log_iovec *buf,
+ struct xfs_rui_log_format *dst_rui_fmt)
+{
+ struct xfs_rui_log_format *src_rui_fmt;
+ uint len;
+
+ src_rui_fmt = buf->i_addr;
+ len = sizeof(struct xfs_rui_log_format) +
+ (src_rui_fmt->rui_nextents - 1) *
+ sizeof(struct xfs_map_extent);
+
+ if (buf->i_len != len)
+ return -EFSCORRUPTED;
+
+ memcpy((char *)dst_rui_fmt, (char *)src_rui_fmt, len);
+ return 0;
+}
+
+/*
+ * Freeing the RUI requires that we remove it from the AIL if it has already
+ * been placed there. However, the RUI may not yet have been placed in the AIL
+ * when called by xfs_rui_release() from RUD processing due to the ordering of
+ * committed vs unpin operations in bulk insert operations. Hence the reference
+ * count to ensure only the last caller frees the RUI.
+ */
+void
+xfs_rui_release(
+ struct xfs_rui_log_item *ruip)
+{
+ if (atomic_dec_and_test(&ruip->rui_refcount)) {
+ xfs_trans_ail_remove(&ruip->rui_item, SHUTDOWN_LOG_IO_ERROR);
+ xfs_rui_item_free(ruip);
+ }
+}
+
+static inline struct xfs_rud_log_item *RUD_ITEM(struct xfs_log_item *lip)
+{
+ return container_of(lip, struct xfs_rud_log_item, rud_item);
+}
+
+STATIC void
+xfs_rud_item_size(
+ struct xfs_log_item *lip,
+ int *nvecs,
+ int *nbytes)
+{
+ *nvecs += 1;
+ *nbytes += sizeof(struct xfs_rud_log_format);
+}
+
+/*
+ * This is called to fill in the vector of log iovecs for the
+ * given rud log item. We use only 1 iovec, and we point that
+ * at the rud_log_format structure embedded in the rud item.
+ * It is at this point that we assert that all of the extent
+ * slots in the rud item have been filled.
+ */
+STATIC void
+xfs_rud_item_format(
+ struct xfs_log_item *lip,
+ struct xfs_log_vec *lv)
+{
+ struct xfs_rud_log_item *rudp = RUD_ITEM(lip);
+ struct xfs_log_iovec *vecp = NULL;
+
+ rudp->rud_format.rud_type = XFS_LI_RUD;
+ rudp->rud_format.rud_size = 1;
+
+ xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_RUD_FORMAT, &rudp->rud_format,
+ sizeof(struct xfs_rud_log_format));
+}
+
+/*
+ * Pinning has no meaning for an rud item, so just return.
+ */
+STATIC void
+xfs_rud_item_pin(
+ struct xfs_log_item *lip)
+{
+}
+
+/*
+ * Since pinning has no meaning for an rud item, unpinning does
+ * not either.
+ */
+STATIC void
+xfs_rud_item_unpin(
+ struct xfs_log_item *lip,
+ int remove)
+{
+}
+
+/*
+ * There isn't much you can do to push on an rud item. It is simply stuck
+ * waiting for the log to be flushed to disk.
+ */
+STATIC uint
+xfs_rud_item_push(
+ struct xfs_log_item *lip,
+ struct list_head *buffer_list)
+{
+ return XFS_ITEM_PINNED;
+}
+
+/*
+ * The RUD is either committed or aborted if the transaction is cancelled. If
+ * the transaction is cancelled, drop our reference to the RUI and free the
+ * RUD.
+ */
+STATIC void
+xfs_rud_item_unlock(
+ struct xfs_log_item *lip)
+{
+ struct xfs_rud_log_item *rudp = RUD_ITEM(lip);
+
+ if (lip->li_flags & XFS_LI_ABORTED) {
+ xfs_rui_release(rudp->rud_ruip);
+ kmem_zone_free(xfs_rud_zone, rudp);
+ }
+}
+
+/*
+ * When the rud item is committed to disk, all we need to do is delete our
+ * reference to our partner rui item and then free ourselves. Since we're
+ * freeing ourselves we must return -1 to keep the transaction code from
+ * further referencing this item.
+ */
+STATIC xfs_lsn_t
+xfs_rud_item_committed(
+ struct xfs_log_item *lip,
+ xfs_lsn_t lsn)
+{
+ struct xfs_rud_log_item *rudp = RUD_ITEM(lip);
+
+ /*
+ * Drop the RUI reference regardless of whether the RUD has been
+ * aborted. Once the RUD transaction is constructed, it is the sole
+ * responsibility of the RUD to release the RUI (even if the RUI is
+ * aborted due to log I/O error).
+ */
+ xfs_rui_release(rudp->rud_ruip);
+ kmem_zone_free(xfs_rud_zone, rudp);
+
+ return (xfs_lsn_t)-1;
+}
+
+/*
+ * The RUD dependency tracking op doesn't do squat. It can't because
+ * it doesn't know where the free extent is coming from. The dependency
+ * tracking has to be handled by the "enclosing" metadata object. For
+ * example, for inodes, the inode is locked throughout the extent freeing
+ * so the dependency should be recorded there.
+ */
+STATIC void
+xfs_rud_item_committing(
+ struct xfs_log_item *lip,
+ xfs_lsn_t lsn)
+{
+}
+
+/*
+ * This is the ops vector shared by all rud log items.
+ */
+static const struct xfs_item_ops xfs_rud_item_ops = {
+ .iop_size = xfs_rud_item_size,
+ .iop_format = xfs_rud_item_format,
+ .iop_pin = xfs_rud_item_pin,
+ .iop_unpin = xfs_rud_item_unpin,
+ .iop_unlock = xfs_rud_item_unlock,
+ .iop_committed = xfs_rud_item_committed,
+ .iop_push = xfs_rud_item_push,
+ .iop_committing = xfs_rud_item_committing,
+};
+
+/*
+ * Allocate and initialize an rud item with the given number of extents.
+ */
+struct xfs_rud_log_item *
+xfs_rud_init(
+ struct xfs_mount *mp,
+ struct xfs_rui_log_item *ruip)
+
+{
+ struct xfs_rud_log_item *rudp;
+
+ rudp = kmem_zone_zalloc(xfs_rud_zone, KM_SLEEP);
+ xfs_log_item_init(mp, &rudp->rud_item, XFS_LI_RUD, &xfs_rud_item_ops);
+ rudp->rud_ruip = ruip;
+ rudp->rud_format.rud_rui_id = ruip->rui_format.rui_id;
+
+ return rudp;
+}
+
+/*
+ * Process an rmap update intent item that was recovered from the log.
+ * We need to update the rmapbt.
+ */
+int
+xfs_rui_recover(
+ struct xfs_mount *mp,
+ struct xfs_rui_log_item *ruip)
+{
+ int i;
+ int error = 0;
+ struct xfs_map_extent *rmap;
+ xfs_fsblock_t startblock_fsb;
+ bool op_ok;
+ struct xfs_rud_log_item *rudp;
+ enum xfs_rmap_intent_type type;
+ int whichfork;
+ xfs_exntst_t state;
+ struct xfs_trans *tp;
+ struct xfs_btree_cur *rcur = NULL;
+
+ ASSERT(!test_bit(XFS_RUI_RECOVERED, &ruip->rui_flags));
+
+ /*
+ * First check the validity of the extents described by the
+ * RUI. If any are bad, then assume that all are bad and
+ * just toss the RUI.
+ */
+ for (i = 0; i < ruip->rui_format.rui_nextents; i++) {
+ rmap = &ruip->rui_format.rui_extents[i];
+ startblock_fsb = XFS_BB_TO_FSB(mp,
+ XFS_FSB_TO_DADDR(mp, rmap->me_startblock));
+ switch (rmap->me_flags & XFS_RMAP_EXTENT_TYPE_MASK) {
+ case XFS_RMAP_EXTENT_MAP:
+ case XFS_RMAP_EXTENT_UNMAP:
+ case XFS_RMAP_EXTENT_CONVERT:
+ case XFS_RMAP_EXTENT_ALLOC:
+ case XFS_RMAP_EXTENT_FREE:
+ op_ok = true;
+ break;
+ default:
+ op_ok = false;
+ break;
+ }
+ if (!op_ok || startblock_fsb == 0 ||
+ rmap->me_len == 0 ||
+ startblock_fsb >= mp->m_sb.sb_dblocks ||
+ rmap->me_len >= mp->m_sb.sb_agblocks ||
+ (rmap->me_flags & ~XFS_RMAP_EXTENT_FLAGS)) {
+ /*
+ * This will pull the RUI from the AIL and
+ * free the memory associated with it.
+ */
+ set_bit(XFS_RUI_RECOVERED, &ruip->rui_flags);
+ xfs_rui_release(ruip);
+ return -EIO;
+ }
+ }
+
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
+ if (error)
+ return error;
+ rudp = xfs_trans_get_rud(tp, ruip);
+
+ for (i = 0; i < ruip->rui_format.rui_nextents; i++) {
+ rmap = &ruip->rui_format.rui_extents[i];
+ state = (rmap->me_flags & XFS_RMAP_EXTENT_UNWRITTEN) ?
+ XFS_EXT_UNWRITTEN : XFS_EXT_NORM;
+ whichfork = (rmap->me_flags & XFS_RMAP_EXTENT_ATTR_FORK) ?
+ XFS_ATTR_FORK : XFS_DATA_FORK;
+ switch (rmap->me_flags & XFS_RMAP_EXTENT_TYPE_MASK) {
+ case XFS_RMAP_EXTENT_MAP:
+ type = XFS_RMAP_MAP;
+ break;
+ case XFS_RMAP_EXTENT_UNMAP:
+ type = XFS_RMAP_UNMAP;
+ break;
+ case XFS_RMAP_EXTENT_CONVERT:
+ type = XFS_RMAP_CONVERT;
+ break;
+ case XFS_RMAP_EXTENT_ALLOC:
+ type = XFS_RMAP_ALLOC;
+ break;
+ case XFS_RMAP_EXTENT_FREE:
+ type = XFS_RMAP_FREE;
+ break;
+ default:
+ error = -EFSCORRUPTED;
+ goto abort_error;
+ }
+ error = xfs_trans_log_finish_rmap_update(tp, rudp, type,
+ rmap->me_owner, whichfork,
+ rmap->me_startoff, rmap->me_startblock,
+ rmap->me_len, state, &rcur);
+ if (error)
+ goto abort_error;
+
+ }
+
+ xfs_rmap_finish_one_cleanup(tp, rcur, error);
+ set_bit(XFS_RUI_RECOVERED, &ruip->rui_flags);
+ error = xfs_trans_commit(tp);
+ return error;
+
+abort_error:
+ xfs_rmap_finish_one_cleanup(tp, rcur, error);
+ xfs_trans_cancel(tp);
+ return error;
+}