LXR linux/fs/xfs/libxfs/xfs_attr

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * Copyright (c) 2000,2002-2003,2005 Silicon Graphics, Inc.
   4 * Copyright (c) 2013 Red Hat, Inc.
   5 * All Rights Reserved.
   6 */
   7#ifndef __XFS_ATTR_LEAF_H__
   8#define __XFS_ATTR_LEAF_H__
   9
  10struct attrlist;
  11struct xfs_attr_list_context;
  12struct xfs_da_args;
  13struct xfs_da_state;
  14struct xfs_da_state_blk;
  15struct xfs_inode;
  16struct xfs_trans;
  17
  18/*
  19 * Incore version of the attribute leaf header.
  20 */
  21struct xfs_attr3_icleaf_hdr {
  22        uint32_t        forw;
  23        uint32_t        back;
  24        uint16_t        magic;
  25        uint16_t        count;
  26        uint16_t        usedbytes;
  27        /*
  28         * Firstused is 32-bit here instead of 16-bit like the on-disk variant
  29         * to support maximum fsb size of 64k without overflow issues throughout
  30         * the attr code. Instead, the overflow condition is handled on
  31         * conversion to/from disk.
  32         */
  33        uint32_t        firstused;
  34        __u8            holes;
  35        struct {
  36                uint16_t        base;
  37                uint16_t        size;
  38        } freemap[XFS_ATTR_LEAF_MAPSIZE];
  39};
  40
  41/*========================================================================
  42 * Function prototypes for the kernel.
  43 *========================================================================*/
  44
  45/*
  46 * Internal routines when attribute fork size < XFS_LITINO(mp).
  47 */
  48void    xfs_attr_shortform_create(struct xfs_da_args *args);
  49void    xfs_attr_shortform_add(struct xfs_da_args *args, int forkoff);
  50int     xfs_attr_shortform_lookup(struct xfs_da_args *args);
  51int     xfs_attr_shortform_getvalue(struct xfs_da_args *args);
  52int     xfs_attr_shortform_to_leaf(struct xfs_da_args *args,
  53                        struct xfs_buf **leaf_bp);
  54int     xfs_attr_shortform_remove(struct xfs_da_args *args);
  55int     xfs_attr_shortform_allfit(struct xfs_buf *bp, struct xfs_inode *dp);
  56int     xfs_attr_shortform_bytesfit(struct xfs_inode *dp, int bytes);
  57xfs_failaddr_t xfs_attr_shortform_verify(struct xfs_inode *ip);
  58void    xfs_attr_fork_remove(struct xfs_inode *ip, struct xfs_trans *tp);
  59
  60/*
  61 * Internal routines when attribute fork size == XFS_LBSIZE(mp).
  62 */
  63int     xfs_attr3_leaf_to_node(struct xfs_da_args *args);
  64int     xfs_attr3_leaf_to_shortform(struct xfs_buf *bp,
  65                                   struct xfs_da_args *args, int forkoff);
  66int     xfs_attr3_leaf_clearflag(struct xfs_da_args *args);
  67int     xfs_attr3_leaf_setflag(struct xfs_da_args *args);
  68int     xfs_attr3_leaf_flipflags(struct xfs_da_args *args);
  69
  70/*
  71 * Routines used for growing the Btree.
  72 */
  73int     xfs_attr3_leaf_split(struct xfs_da_state *state,
  74                                   struct xfs_da_state_blk *oldblk,
  75                                   struct xfs_da_state_blk *newblk);
  76int     xfs_attr3_leaf_lookup_int(struct xfs_buf *leaf,
  77                                        struct xfs_da_args *args);
  78int     xfs_attr3_leaf_getvalue(struct xfs_buf *bp, struct xfs_da_args *args);
  79int     xfs_attr3_leaf_add(struct xfs_buf *leaf_buffer,
  80                                 struct xfs_da_args *args);
  81int     xfs_attr3_leaf_remove(struct xfs_buf *leaf_buffer,
  82                                    struct xfs_da_args *args);
  83int     xfs_attr3_leaf_list_int(struct xfs_buf *bp,
  84                                struct xfs_attr_list_context *context);
  85
  86/*
  87 * Routines used for shrinking the Btree.
  88 */
  89int     xfs_attr3_leaf_toosmall(struct xfs_da_state *state, int *retval);
  90void    xfs_attr3_leaf_unbalance(struct xfs_da_state *state,
  91                                       struct xfs_da_state_blk *drop_blk,
  92                                       struct xfs_da_state_blk *save_blk);
  93/*
  94 * Utility routines.
  95 */
  96xfs_dahash_t    xfs_attr_leaf_lasthash(struct xfs_buf *bp, int *count);
  97int     xfs_attr_leaf_order(struct xfs_buf *leaf1_bp,
  98                                   struct xfs_buf *leaf2_bp);
  99int     xfs_attr_leaf_newentsize(struct xfs_da_args *args, int *local);
 100int     xfs_attr3_leaf_read(struct xfs_trans *tp, struct xfs_inode *dp,
 101                        xfs_dablk_t bno, struct xfs_buf **bpp);
 102void    xfs_attr3_leaf_hdr_from_disk(struct xfs_da_geometry *geo,
 103                                     struct xfs_attr3_icleaf_hdr *to,
 104                                     struct xfs_attr_leafblock *from);
 105void    xfs_attr3_leaf_hdr_to_disk(struct xfs_da_geometry *geo,
 106                                   struct xfs_attr_leafblock *to,
 107                                   struct xfs_attr3_icleaf_hdr *from);
 108
 109#endif  /* __XFS_ATTR_LEAF_H__ */
 110