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 * Function prototypes for the kernel. 44 *========================================================================*/ 45 46 /* 47 * Internal routines when attribute fork size < XFS_LITINO(mp). 48 */ 49 void xfs_attr_shortform_create(struct xfs_da_args *args); 50 void xfs_attr_shortform_add(struct xfs_da_args *args, int forkoff); 51 int xfs_attr_shortform_lookup(struct xfs_da_args *args); 52 int xfs_attr_shortform_getvalue(struct xfs_da_args *args); 53 int xfs_attr_shortform_to_leaf(struct xfs_da_args *args, 54 struct xfs_buf **leaf_bp); 55 int xfs_attr_shortform_remove(struct xfs_da_args *args); 56 int xfs_attr_shortform_allfit(struct xfs_buf *bp, struct xfs_inode *dp); 57 int xfs_attr_shortform_bytesfit(struct xfs_inode *dp, int bytes); 58 xfs_failaddr_t xfs_attr_shortform_verify(struct xfs_inode *ip); 59 void xfs_attr_fork_remove(struct xfs_inode *ip, struct xfs_trans *tp); 60 61 /* 62 * Internal routines when attribute fork size == XFS_LBSIZE(mp). 63 */ 64 int xfs_attr3_leaf_to_node(struct xfs_da_args *args); 65 int xfs_attr3_leaf_to_shortform(struct xfs_buf *bp, 66 struct xfs_da_args *args, int forkoff); 67 int xfs_attr3_leaf_clearflag(struct xfs_da_args *args); 68 int xfs_attr3_leaf_setflag(struct xfs_da_args *args); 69 int xfs_attr3_leaf_flipflags(struct xfs_da_args *args); 70 71 /* 72 * Routines used for growing the Btree. 73 */ 74 int xfs_attr3_leaf_split(struct xfs_da_state *state, 75 struct xfs_da_state_blk *oldblk, 76 struct xfs_da_state_blk *newblk); 77 int xfs_attr3_leaf_lookup_int(struct xfs_buf *leaf, 78 struct xfs_da_args *args); 79 int xfs_attr3_leaf_getvalue(struct xfs_buf *bp, struct xfs_da_args *args); 80 int xfs_attr3_leaf_add(struct xfs_buf *leaf_buffer, 81 struct xfs_da_args *args); 82 int xfs_attr3_leaf_remove(struct xfs_buf *leaf_buffer, 83 struct xfs_da_args *args); 84 int xfs_attr3_leaf_list_int(struct xfs_buf *bp, 85 struct xfs_attr_list_context *context); 86 87 /* 88 * Routines used for shrinking the Btree. 89 */ 90 int xfs_attr3_leaf_toosmall(struct xfs_da_state *state, int *retval); 91 void xfs_attr3_leaf_unbalance(struct xfs_da_state *state, 92 struct xfs_da_state_blk *drop_blk, 93 struct xfs_da_state_blk *save_blk); 94 /* 95 * Utility routines. 96 */ 97 xfs_dahash_t xfs_attr_leaf_lasthash(struct xfs_buf *bp, int *count); 98 int xfs_attr_leaf_order(struct xfs_buf *leaf1_bp, 99 struct xfs_buf *leaf2_bp); 100 int xfs_attr_leaf_newentsize(struct xfs_da_args *args, int *local); 101 int xfs_attr3_leaf_read(struct xfs_trans *tp, struct xfs_inode *dp, 102 xfs_dablk_t bno, struct xfs_buf **bpp); 103 void xfs_attr3_leaf_hdr_from_disk(struct xfs_da_geometry *geo, 104 struct xfs_attr3_icleaf_hdr *to, 105 struct xfs_attr_leafblock *from); 106 void xfs_attr3_leaf_hdr_to_disk(struct xfs_da_geometry *geo, 107 struct xfs_attr_leafblock *to, 108 struct xfs_attr3_icleaf_hdr *from); 109 110 #endif /* __XFS_ATTR_LEAF_H__ */ 111