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-rw-r--r--fs/xfs/xfs_log.h166
1 files changed, 166 insertions, 0 deletions
diff --git a/fs/xfs/xfs_log.h b/fs/xfs/xfs_log.h
new file mode 100644
index 000000000..2728886c2
--- /dev/null
+++ b/fs/xfs/xfs_log.h
@@ -0,0 +1,166 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#ifndef __XFS_LOG_H__
+#define __XFS_LOG_H__
+
+struct xfs_cil_ctx;
+
+struct xfs_log_vec {
+ struct list_head lv_list; /* CIL lv chain ptrs */
+ uint32_t lv_order_id; /* chain ordering info */
+ int lv_niovecs; /* number of iovecs in lv */
+ struct xfs_log_iovec *lv_iovecp; /* iovec array */
+ struct xfs_log_item *lv_item; /* owner */
+ char *lv_buf; /* formatted buffer */
+ int lv_bytes; /* accounted space in buffer */
+ int lv_buf_len; /* aligned size of buffer */
+ int lv_size; /* size of allocated lv */
+};
+
+#define XFS_LOG_VEC_ORDERED (-1)
+
+/*
+ * Calculate the log iovec length for a given user buffer length. Intended to be
+ * used by ->iop_size implementations when sizing buffers of arbitrary
+ * alignments.
+ */
+static inline int
+xlog_calc_iovec_len(int len)
+{
+ return roundup(len, sizeof(uint32_t));
+}
+
+void *xlog_prepare_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp,
+ uint type);
+
+static inline void
+xlog_finish_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec *vec,
+ int data_len)
+{
+ struct xlog_op_header *oph = vec->i_addr;
+ int len;
+
+ /*
+ * Always round up the length to the correct alignment so callers don't
+ * need to know anything about this log vec layout requirement. This
+ * means we have to zero the area the data to be written does not cover.
+ * This is complicated by fact the payload region is offset into the
+ * logvec region by the opheader that tracks the payload.
+ */
+ len = xlog_calc_iovec_len(data_len);
+ if (len - data_len != 0) {
+ char *buf = vec->i_addr + sizeof(struct xlog_op_header);
+
+ memset(buf + data_len, 0, len - data_len);
+ }
+
+ /*
+ * The opheader tracks aligned payload length, whilst the logvec tracks
+ * the overall region length.
+ */
+ oph->oh_len = cpu_to_be32(len);
+
+ len += sizeof(struct xlog_op_header);
+ lv->lv_buf_len += len;
+ lv->lv_bytes += len;
+ vec->i_len = len;
+
+ /* Catch buffer overruns */
+ ASSERT((void *)lv->lv_buf + lv->lv_bytes <= (void *)lv + lv->lv_size);
+}
+
+/*
+ * Copy the amount of data requested by the caller into a new log iovec.
+ */
+static inline void *
+xlog_copy_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp,
+ uint type, void *data, int len)
+{
+ void *buf;
+
+ buf = xlog_prepare_iovec(lv, vecp, type);
+ memcpy(buf, data, len);
+ xlog_finish_iovec(lv, *vecp, len);
+ return buf;
+}
+
+static inline void *
+xlog_copy_from_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp,
+ const struct xfs_log_iovec *src)
+{
+ return xlog_copy_iovec(lv, vecp, src->i_type, src->i_addr, src->i_len);
+}
+
+/*
+ * By comparing each component, we don't have to worry about extra
+ * endian issues in treating two 32 bit numbers as one 64 bit number
+ */
+static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
+{
+ if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
+ return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;
+
+ if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2))
+ return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999;
+
+ return 0;
+}
+
+#define XFS_LSN_CMP(x,y) _lsn_cmp(x,y)
+
+/*
+ * Flags to xfs_log_force()
+ *
+ * XFS_LOG_SYNC: Synchronous force in-core log to disk
+ */
+#define XFS_LOG_SYNC 0x1
+
+/* Log manager interfaces */
+struct xfs_mount;
+struct xlog_in_core;
+struct xlog_ticket;
+struct xfs_log_item;
+struct xfs_item_ops;
+struct xfs_trans;
+struct xlog;
+
+int xfs_log_force(struct xfs_mount *mp, uint flags);
+int xfs_log_force_seq(struct xfs_mount *mp, xfs_csn_t seq, uint flags,
+ int *log_forced);
+int xfs_log_mount(struct xfs_mount *mp,
+ struct xfs_buftarg *log_target,
+ xfs_daddr_t start_block,
+ int num_bblocks);
+int xfs_log_mount_finish(struct xfs_mount *mp);
+void xfs_log_mount_cancel(struct xfs_mount *);
+xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp);
+xfs_lsn_t xlog_assign_tail_lsn_locked(struct xfs_mount *mp);
+void xfs_log_space_wake(struct xfs_mount *mp);
+int xfs_log_reserve(struct xfs_mount *mp, int length, int count,
+ struct xlog_ticket **ticket, bool permanent);
+int xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic);
+void xfs_log_unmount(struct xfs_mount *mp);
+bool xfs_log_writable(struct xfs_mount *mp);
+
+struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket);
+void xfs_log_ticket_put(struct xlog_ticket *ticket);
+
+void xlog_cil_process_committed(struct list_head *list);
+bool xfs_log_item_in_current_chkpt(struct xfs_log_item *lip);
+
+void xfs_log_work_queue(struct xfs_mount *mp);
+int xfs_log_quiesce(struct xfs_mount *mp);
+void xfs_log_clean(struct xfs_mount *mp);
+bool xfs_log_check_lsn(struct xfs_mount *, xfs_lsn_t);
+
+xfs_lsn_t xlog_grant_push_threshold(struct xlog *log, int need_bytes);
+bool xlog_force_shutdown(struct xlog *log, uint32_t shutdown_flags);
+
+void xlog_use_incompat_feat(struct xlog *log);
+void xlog_drop_incompat_feat(struct xlog *log);
+int xfs_attr_use_log_assist(struct xfs_mount *mp);
+
+#endif /* __XFS_LOG_H__ */