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 10 struct attrlist; 11 struct attrlist_cursor_kern; 12 struct xfs_attr_list_context; 13 struct xfs_da_args; 14 struct xfs_da_state; 15 struct xfs_da_state_blk; 16 struct xfs_inode; 17 struct xfs_trans; 18 19 /* 20 * Incore version of the attribute leaf header. 21 */ 22 struct xfs_attr3_icleaf_hdr { 23 uint32_t forw; 24 uint32_t back; 25 uint16_t magic; 26 uint16_t count; 27 uint16_t usedbytes; 28 /* 29 * Firstused is 32-bit here instead of 16-bit like the on-disk variant 30 * to support maximum fsb size of 64k without overflow issues throughout 31 * the attr code. Instead, the overflow condition is handled on 32 * conversion to/from disk. 33 */ 34 uint32_t firstused; 35 __u8 holes; 36 struct { 37 uint16_t base; 38 uint16_t size; 39 } freemap[XFS_ATTR_LEAF_MAPSIZE]; 40 }; 41 42 /* 43 * Used to keep a list of "remote value" extents when unlinking an inode. 44 */ 45 typedef struct xfs_attr_inactive_list { 46 xfs_dablk_t valueblk; /* block number of value bytes */ 47 int valuelen; /* number of bytes in value */ 48 } xfs_attr_inactive_list_t; 49 50 51 /*======================================================================== 52 * Function prototypes for the kernel. 53 *========================================================================*/ 54 55 /* 56 * Internal routines when attribute fork size < XFS_LITINO(mp). 57 */ 58 void xfs_attr_shortform_create(struct xfs_da_args *args); 59 void xfs_attr_shortform_add(struct xfs_da_args *args, int forkoff); 60 int xfs_attr_shortform_lookup(struct xfs_da_args *args); 61 int xfs_attr_shortform_getvalue(struct xfs_da_args *args); 62 int xfs_attr_shortform_to_leaf(struct xfs_da_args *args, 63 struct xfs_buf **leaf_bp); 64 int xfs_attr_shortform_remove(struct xfs_da_args *args); 65 int xfs_attr_shortform_allfit(struct xfs_buf *bp, struct xfs_inode *dp); 66 int xfs_attr_shortform_bytesfit(struct xfs_inode *dp, int bytes); 67 xfs_failaddr_t xfs_attr_shortform_verify(struct xfs_inode *ip); 68 void xfs_attr_fork_remove(struct xfs_inode *ip, struct xfs_trans *tp); 69 70 /* 71 * Internal routines when attribute fork size == XFS_LBSIZE(mp). 72 */ 73 int xfs_attr3_leaf_to_node(struct xfs_da_args *args); 74 int xfs_attr3_leaf_to_shortform(struct xfs_buf *bp, 75 struct xfs_da_args *args, int forkoff); 76 int xfs_attr3_leaf_clearflag(struct xfs_da_args *args); 77 int xfs_attr3_leaf_setflag(struct xfs_da_args *args); 78 int xfs_attr3_leaf_flipflags(struct xfs_da_args *args); 79 80 /* 81 * Routines used for growing the Btree. 82 */ 83 int xfs_attr3_leaf_split(struct xfs_da_state *state, 84 struct xfs_da_state_blk *oldblk, 85 struct xfs_da_state_blk *newblk); 86 int xfs_attr3_leaf_lookup_int(struct xfs_buf *leaf, 87 struct xfs_da_args *args); 88 int xfs_attr3_leaf_getvalue(struct xfs_buf *bp, struct xfs_da_args *args); 89 int xfs_attr3_leaf_add(struct xfs_buf *leaf_buffer, 90 struct xfs_da_args *args); 91 int xfs_attr3_leaf_remove(struct xfs_buf *leaf_buffer, 92 struct xfs_da_args *args); 93 int xfs_attr3_leaf_list_int(struct xfs_buf *bp, 94 struct xfs_attr_list_context *context); 95 96 /* 97 * Routines used for shrinking the Btree. 98 */ 99 int xfs_attr3_leaf_toosmall(struct xfs_da_state *state, int *retval); 100 void xfs_attr3_leaf_unbalance(struct xfs_da_state *state, 101 struct xfs_da_state_blk *drop_blk, 102 struct xfs_da_state_blk *save_blk); 103 /* 104 * Utility routines. 105 */ 106 xfs_dahash_t xfs_attr_leaf_lasthash(struct xfs_buf *bp, int *count); 107 int xfs_attr_leaf_order(struct xfs_buf *leaf1_bp, 108 struct xfs_buf *leaf2_bp); 109 int xfs_attr_leaf_newentsize(struct xfs_da_args *args, int *local); 110 int xfs_attr3_leaf_read(struct xfs_trans *tp, struct xfs_inode *dp, 111 xfs_dablk_t bno, struct xfs_buf **bpp); 112 void xfs_attr3_leaf_hdr_from_disk(struct xfs_da_geometry *geo, 113 struct xfs_attr3_icleaf_hdr *to, 114 struct xfs_attr_leafblock *from); 115 void xfs_attr3_leaf_hdr_to_disk(struct xfs_da_geometry *geo, 116 struct xfs_attr_leafblock *to, 117 struct xfs_attr3_icleaf_hdr *from); 118 119 #endif /* __XFS_ATTR_LEAF_H__ */ 120