fs/xfs/xfs_attr_item.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later
   2  *
   3  * Copyright (C) 2022 Oracle.  All Rights Reserved.
   4  * Author: Allison Henderson <allison.henderson@oracle.com>
   5  */
   6 #ifndef __XFS_ATTR_ITEM_H__
   7 #define __XFS_ATTR_ITEM_H__
   8
   9 /* kernel only ATTRI/ATTRD definitions */
  10
  11 struct xfs_mount;
  12 struct kmem_zone;
  13
  14 struct xfs_attri_log_nameval {
  15         struct xfs_log_iovec    name;
  16         struct xfs_log_iovec    new_name;       /* PPTR_REPLACE only */
  17         struct xfs_log_iovec    value;
  18         struct xfs_log_iovec    new_value;      /* PPTR_REPLACE only */
  19         refcount_t              refcount;
  20
  21         /* name and value follow the end of this struct */
  22 };
  23
  24 /*
  25  * This is the "attr intention" log item.  It is used to log the fact that some
  26  * extended attribute operations need to be processed.  An operation is
  27  * currently either a set or remove.  Set or remove operations are described by
  28  * the xfs_attr_intent which may be logged to this intent.
  29  *
  30  * During a normal attr operation, name and value point to the name and value
  31  * fields of the caller's xfs_da_args structure.  During a recovery, the name
  32  * and value buffers are copied from the log, and stored in a trailing buffer
  33  * attached to the xfs_attr_intent until they are committed.  They are freed
  34  * when the xfs_attr_intent itself is freed when the work is done.
  35  */
  36 struct xfs_attri_log_item {
  37         struct xfs_log_item             attri_item;
  38         atomic_t                        attri_refcount;
  39         struct xfs_attri_log_nameval    *attri_nameval;
  40         struct xfs_attri_log_format     attri_format;
  41 };
  42
  43 /*
  44  * This is the "attr done" log item.  It is used to log the fact that some attrs
  45  * earlier mentioned in an attri item have been freed.
  46  */
  47 struct xfs_attrd_log_item {
  48         struct xfs_log_item             attrd_item;
  49         struct xfs_attri_log_item       *attrd_attrip;
  50         struct xfs_attrd_log_format     attrd_format;
  51 };
  52
  53 extern struct kmem_cache        *xfs_attri_cache;
  54 extern struct kmem_cache        *xfs_attrd_cache;
  55
  56 enum xfs_attr_defer_op {
  57         XFS_ATTR_DEFER_SET,
  58         XFS_ATTR_DEFER_REMOVE,
  59         XFS_ATTR_DEFER_REPLACE,
  60 };
  61
  62 void xfs_attr_defer_add(struct xfs_da_args *args, enum xfs_attr_defer_op op);
  63
  64 #endif  /* __XFS_ATTR_ITEM_H__ */