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Diffstat (limited to 'fs/xfs/xfs_refcount_item.c')
-rw-r--r--fs/xfs/xfs_refcount_item.c208
1 files changed, 207 insertions, 1 deletions
diff --git a/fs/xfs/xfs_refcount_item.c b/fs/xfs/xfs_refcount_item.c
index fc2dfe92c43a..e8a13872389f 100644
--- a/fs/xfs/xfs_refcount_item.c
+++ b/fs/xfs/xfs_refcount_item.c
@@ -217,7 +217,7 @@ static const struct xfs_item_ops xfs_cud_item_ops = {
.iop_release = xfs_cud_item_release,
};
-struct xfs_cud_log_item *
+static struct xfs_cud_log_item *
xfs_trans_get_cud(
struct xfs_trans *tp,
struct xfs_cui_log_item *cuip)
@@ -235,6 +235,212 @@ xfs_trans_get_cud(
}
/*
+ * Finish an refcount update and log it to the CUD. Note that the
+ * transaction is marked dirty regardless of whether the refcount
+ * update succeeds or fails to support the CUI/CUD lifecycle rules.
+ */
+static int
+xfs_trans_log_finish_refcount_update(
+ struct xfs_trans *tp,
+ struct xfs_cud_log_item *cudp,
+ enum xfs_refcount_intent_type type,
+ xfs_fsblock_t startblock,
+ xfs_extlen_t blockcount,
+ xfs_fsblock_t *new_fsb,
+ xfs_extlen_t *new_len,
+ struct xfs_btree_cur **pcur)
+{
+ int error;
+
+ error = xfs_refcount_finish_one(tp, type, startblock,
+ blockcount, new_fsb, new_len, pcur);
+
+ /*
+ * Mark the transaction dirty, even on error. This ensures the
+ * transaction is aborted, which:
+ *
+ * 1.) releases the CUI and frees the CUD
+ * 2.) shuts down the filesystem
+ */
+ tp->t_flags |= XFS_TRANS_DIRTY;
+ set_bit(XFS_LI_DIRTY, &cudp->cud_item.li_flags);
+
+ return error;
+}
+
+/* Sort refcount intents by AG. */
+static int
+xfs_refcount_update_diff_items(
+ void *priv,
+ struct list_head *a,
+ struct list_head *b)
+{
+ struct xfs_mount *mp = priv;
+ struct xfs_refcount_intent *ra;
+ struct xfs_refcount_intent *rb;
+
+ ra = container_of(a, struct xfs_refcount_intent, ri_list);
+ rb = container_of(b, struct xfs_refcount_intent, ri_list);
+ return XFS_FSB_TO_AGNO(mp, ra->ri_startblock) -
+ XFS_FSB_TO_AGNO(mp, rb->ri_startblock);
+}
+
+/* Get an CUI. */
+STATIC void *
+xfs_refcount_update_create_intent(
+ struct xfs_trans *tp,
+ unsigned int count)
+{
+ struct xfs_cui_log_item *cuip;
+
+ ASSERT(tp != NULL);
+ ASSERT(count > 0);
+
+ cuip = xfs_cui_init(tp->t_mountp, count);
+ ASSERT(cuip != NULL);
+
+ /*
+ * Get a log_item_desc to point at the new item.
+ */
+ xfs_trans_add_item(tp, &cuip->cui_item);
+ return cuip;
+}
+
+/* Set the phys extent flags for this reverse mapping. */
+static void
+xfs_trans_set_refcount_flags(
+ struct xfs_phys_extent *refc,
+ enum xfs_refcount_intent_type type)
+{
+ refc->pe_flags = 0;
+ switch (type) {
+ case XFS_REFCOUNT_INCREASE:
+ case XFS_REFCOUNT_DECREASE:
+ case XFS_REFCOUNT_ALLOC_COW:
+ case XFS_REFCOUNT_FREE_COW:
+ refc->pe_flags |= type;
+ break;
+ default:
+ ASSERT(0);
+ }
+}
+
+/* Log refcount updates in the intent item. */
+STATIC void
+xfs_refcount_update_log_item(
+ struct xfs_trans *tp,
+ void *intent,
+ struct list_head *item)
+{
+ struct xfs_cui_log_item *cuip = intent;
+ struct xfs_refcount_intent *refc;
+ uint next_extent;
+ struct xfs_phys_extent *ext;
+
+ refc = container_of(item, struct xfs_refcount_intent, ri_list);
+
+ tp->t_flags |= XFS_TRANS_DIRTY;
+ set_bit(XFS_LI_DIRTY, &cuip->cui_item.li_flags);
+
+ /*
+ * atomic_inc_return gives us the value after the increment;
+ * we want to use it as an array index so we need to subtract 1 from
+ * it.
+ */
+ next_extent = atomic_inc_return(&cuip->cui_next_extent) - 1;
+ ASSERT(next_extent < cuip->cui_format.cui_nextents);
+ ext = &cuip->cui_format.cui_extents[next_extent];
+ ext->pe_startblock = refc->ri_startblock;
+ ext->pe_len = refc->ri_blockcount;
+ xfs_trans_set_refcount_flags(ext, refc->ri_type);
+}
+
+/* Get an CUD so we can process all the deferred refcount updates. */
+STATIC void *
+xfs_refcount_update_create_done(
+ struct xfs_trans *tp,
+ void *intent,
+ unsigned int count)
+{
+ return xfs_trans_get_cud(tp, intent);
+}
+
+/* Process a deferred refcount update. */
+STATIC int
+xfs_refcount_update_finish_item(
+ struct xfs_trans *tp,
+ struct list_head *item,
+ void *done_item,
+ void **state)
+{
+ struct xfs_refcount_intent *refc;
+ xfs_fsblock_t new_fsb;
+ xfs_extlen_t new_aglen;
+ int error;
+
+ refc = container_of(item, struct xfs_refcount_intent, ri_list);
+ error = xfs_trans_log_finish_refcount_update(tp, done_item,
+ refc->ri_type,
+ refc->ri_startblock,
+ refc->ri_blockcount,
+ &new_fsb, &new_aglen,
+ (struct xfs_btree_cur **)state);
+ /* Did we run out of reservation? Requeue what we didn't finish. */
+ if (!error && new_aglen > 0) {
+ ASSERT(refc->ri_type == XFS_REFCOUNT_INCREASE ||
+ refc->ri_type == XFS_REFCOUNT_DECREASE);
+ refc->ri_startblock = new_fsb;
+ refc->ri_blockcount = new_aglen;
+ return -EAGAIN;
+ }
+ kmem_free(refc);
+ return error;
+}
+
+/* Clean up after processing deferred refcounts. */
+STATIC void
+xfs_refcount_update_finish_cleanup(
+ struct xfs_trans *tp,
+ void *state,
+ int error)
+{
+ struct xfs_btree_cur *rcur = state;
+
+ xfs_refcount_finish_one_cleanup(tp, rcur, error);
+}
+
+/* Abort all pending CUIs. */
+STATIC void
+xfs_refcount_update_abort_intent(
+ void *intent)
+{
+ xfs_cui_release(intent);
+}
+
+/* Cancel a deferred refcount update. */
+STATIC void
+xfs_refcount_update_cancel_item(
+ struct list_head *item)
+{
+ struct xfs_refcount_intent *refc;
+
+ refc = container_of(item, struct xfs_refcount_intent, ri_list);
+ kmem_free(refc);
+}
+
+const struct xfs_defer_op_type xfs_refcount_update_defer_type = {
+ .max_items = XFS_CUI_MAX_FAST_EXTENTS,
+ .diff_items = xfs_refcount_update_diff_items,
+ .create_intent = xfs_refcount_update_create_intent,
+ .abort_intent = xfs_refcount_update_abort_intent,
+ .log_item = xfs_refcount_update_log_item,
+ .create_done = xfs_refcount_update_create_done,
+ .finish_item = xfs_refcount_update_finish_item,
+ .finish_cleanup = xfs_refcount_update_finish_cleanup,
+ .cancel_item = xfs_refcount_update_cancel_item,
+};
+
+/*
* Process a refcount update intent item that was recovered from the log.
* We need to update the refcountbt.
*/