334 lines
10 KiB
C
334 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#ifndef __XFS_DIR2_H__
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#define __XFS_DIR2_H__
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#include "xfs_da_format.h"
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#include "xfs_da_btree.h"
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struct xfs_da_args;
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struct xfs_inode;
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struct xfs_mount;
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struct xfs_trans;
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struct xfs_dir2_sf_hdr;
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struct xfs_dir2_sf_entry;
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struct xfs_dir2_data_hdr;
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struct xfs_dir2_data_entry;
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struct xfs_dir2_data_unused;
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struct xfs_dir3_icfree_hdr;
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struct xfs_dir3_icleaf_hdr;
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extern struct xfs_name xfs_name_dotdot;
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/*
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* Convert inode mode to directory entry filetype
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*/
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extern unsigned char xfs_mode_to_ftype(int mode);
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/*
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* directory operations vector for encode/decode routines
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*/
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struct xfs_dir_ops {
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int (*sf_entsize)(struct xfs_dir2_sf_hdr *hdr, int len);
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struct xfs_dir2_sf_entry *
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(*sf_nextentry)(struct xfs_dir2_sf_hdr *hdr,
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struct xfs_dir2_sf_entry *sfep);
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uint8_t (*sf_get_ftype)(struct xfs_dir2_sf_entry *sfep);
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void (*sf_put_ftype)(struct xfs_dir2_sf_entry *sfep,
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uint8_t ftype);
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xfs_ino_t (*sf_get_ino)(struct xfs_dir2_sf_hdr *hdr,
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struct xfs_dir2_sf_entry *sfep);
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void (*sf_put_ino)(struct xfs_dir2_sf_hdr *hdr,
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struct xfs_dir2_sf_entry *sfep,
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xfs_ino_t ino);
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xfs_ino_t (*sf_get_parent_ino)(struct xfs_dir2_sf_hdr *hdr);
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void (*sf_put_parent_ino)(struct xfs_dir2_sf_hdr *hdr,
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xfs_ino_t ino);
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int (*data_entsize)(int len);
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uint8_t (*data_get_ftype)(struct xfs_dir2_data_entry *dep);
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void (*data_put_ftype)(struct xfs_dir2_data_entry *dep,
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uint8_t ftype);
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__be16 * (*data_entry_tag_p)(struct xfs_dir2_data_entry *dep);
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struct xfs_dir2_data_free *
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(*data_bestfree_p)(struct xfs_dir2_data_hdr *hdr);
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xfs_dir2_data_aoff_t data_dot_offset;
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xfs_dir2_data_aoff_t data_dotdot_offset;
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xfs_dir2_data_aoff_t data_first_offset;
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size_t data_entry_offset;
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struct xfs_dir2_data_entry *
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(*data_dot_entry_p)(struct xfs_dir2_data_hdr *hdr);
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struct xfs_dir2_data_entry *
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(*data_dotdot_entry_p)(struct xfs_dir2_data_hdr *hdr);
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struct xfs_dir2_data_entry *
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(*data_first_entry_p)(struct xfs_dir2_data_hdr *hdr);
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struct xfs_dir2_data_entry *
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(*data_entry_p)(struct xfs_dir2_data_hdr *hdr);
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struct xfs_dir2_data_unused *
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(*data_unused_p)(struct xfs_dir2_data_hdr *hdr);
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int leaf_hdr_size;
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void (*leaf_hdr_to_disk)(struct xfs_dir2_leaf *to,
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struct xfs_dir3_icleaf_hdr *from);
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void (*leaf_hdr_from_disk)(struct xfs_dir3_icleaf_hdr *to,
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struct xfs_dir2_leaf *from);
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int (*leaf_max_ents)(struct xfs_da_geometry *geo);
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struct xfs_dir2_leaf_entry *
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(*leaf_ents_p)(struct xfs_dir2_leaf *lp);
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int node_hdr_size;
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void (*node_hdr_to_disk)(struct xfs_da_intnode *to,
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struct xfs_da3_icnode_hdr *from);
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void (*node_hdr_from_disk)(struct xfs_da3_icnode_hdr *to,
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struct xfs_da_intnode *from);
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struct xfs_da_node_entry *
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(*node_tree_p)(struct xfs_da_intnode *dap);
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int free_hdr_size;
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void (*free_hdr_to_disk)(struct xfs_dir2_free *to,
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struct xfs_dir3_icfree_hdr *from);
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void (*free_hdr_from_disk)(struct xfs_dir3_icfree_hdr *to,
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struct xfs_dir2_free *from);
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int (*free_max_bests)(struct xfs_da_geometry *geo);
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__be16 * (*free_bests_p)(struct xfs_dir2_free *free);
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xfs_dir2_db_t (*db_to_fdb)(struct xfs_da_geometry *geo,
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xfs_dir2_db_t db);
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int (*db_to_fdindex)(struct xfs_da_geometry *geo,
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xfs_dir2_db_t db);
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};
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extern const struct xfs_dir_ops *
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xfs_dir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp);
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extern const struct xfs_dir_ops *
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xfs_nondir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp);
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/*
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* Generic directory interface routines
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*/
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extern void xfs_dir_startup(void);
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extern int xfs_da_mount(struct xfs_mount *mp);
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extern void xfs_da_unmount(struct xfs_mount *mp);
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extern int xfs_dir_isempty(struct xfs_inode *dp);
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extern int xfs_dir_init(struct xfs_trans *tp, struct xfs_inode *dp,
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struct xfs_inode *pdp);
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extern int xfs_dir_createname(struct xfs_trans *tp, struct xfs_inode *dp,
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struct xfs_name *name, xfs_ino_t inum,
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xfs_extlen_t tot);
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extern int xfs_dir_lookup(struct xfs_trans *tp, struct xfs_inode *dp,
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struct xfs_name *name, xfs_ino_t *inum,
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struct xfs_name *ci_name);
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extern int xfs_dir_removename(struct xfs_trans *tp, struct xfs_inode *dp,
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struct xfs_name *name, xfs_ino_t ino,
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xfs_extlen_t tot);
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extern int xfs_dir_replace(struct xfs_trans *tp, struct xfs_inode *dp,
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struct xfs_name *name, xfs_ino_t inum,
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xfs_extlen_t tot);
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extern int xfs_dir_canenter(struct xfs_trans *tp, struct xfs_inode *dp,
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struct xfs_name *name);
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/*
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* Direct call from the bmap code, bypassing the generic directory layer.
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*/
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extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
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/*
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* Interface routines used by userspace utilities
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*/
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extern int xfs_dir2_isblock(struct xfs_da_args *args, int *r);
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extern int xfs_dir2_isleaf(struct xfs_da_args *args, int *r);
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extern int xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db,
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struct xfs_buf *bp);
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extern void xfs_dir2_data_freescan_int(struct xfs_da_geometry *geo,
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const struct xfs_dir_ops *ops,
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struct xfs_dir2_data_hdr *hdr, int *loghead);
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extern void xfs_dir2_data_freescan(struct xfs_inode *dp,
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struct xfs_dir2_data_hdr *hdr, int *loghead);
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extern void xfs_dir2_data_log_entry(struct xfs_da_args *args,
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struct xfs_buf *bp, struct xfs_dir2_data_entry *dep);
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extern void xfs_dir2_data_log_header(struct xfs_da_args *args,
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struct xfs_buf *bp);
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extern void xfs_dir2_data_log_unused(struct xfs_da_args *args,
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struct xfs_buf *bp, struct xfs_dir2_data_unused *dup);
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extern void xfs_dir2_data_make_free(struct xfs_da_args *args,
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struct xfs_buf *bp, xfs_dir2_data_aoff_t offset,
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xfs_dir2_data_aoff_t len, int *needlogp, int *needscanp);
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extern int xfs_dir2_data_use_free(struct xfs_da_args *args,
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struct xfs_buf *bp, struct xfs_dir2_data_unused *dup,
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xfs_dir2_data_aoff_t offset, xfs_dir2_data_aoff_t len,
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int *needlogp, int *needscanp);
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extern struct xfs_dir2_data_free *xfs_dir2_data_freefind(
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struct xfs_dir2_data_hdr *hdr, struct xfs_dir2_data_free *bf,
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struct xfs_dir2_data_unused *dup);
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extern int xfs_dir_ino_validate(struct xfs_mount *mp, xfs_ino_t ino);
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extern const struct xfs_buf_ops xfs_dir3_block_buf_ops;
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extern const struct xfs_buf_ops xfs_dir3_leafn_buf_ops;
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extern const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops;
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extern const struct xfs_buf_ops xfs_dir3_free_buf_ops;
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extern const struct xfs_buf_ops xfs_dir3_data_buf_ops;
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/*
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* Directory offset/block conversion functions.
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*
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* DB blocks here are logical directory block numbers, not filesystem blocks.
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*/
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/*
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* Convert dataptr to byte in file space
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*/
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static inline xfs_dir2_off_t
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xfs_dir2_dataptr_to_byte(xfs_dir2_dataptr_t dp)
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{
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return (xfs_dir2_off_t)dp << XFS_DIR2_DATA_ALIGN_LOG;
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}
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/*
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* Convert byte in file space to dataptr. It had better be aligned.
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*/
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static inline xfs_dir2_dataptr_t
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xfs_dir2_byte_to_dataptr(xfs_dir2_off_t by)
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{
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return (xfs_dir2_dataptr_t)(by >> XFS_DIR2_DATA_ALIGN_LOG);
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}
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/*
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* Convert byte in space to (DB) block
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*/
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static inline xfs_dir2_db_t
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xfs_dir2_byte_to_db(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
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{
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return (xfs_dir2_db_t)(by >> geo->blklog);
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}
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/*
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* Convert dataptr to a block number
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*/
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static inline xfs_dir2_db_t
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xfs_dir2_dataptr_to_db(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp)
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{
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return xfs_dir2_byte_to_db(geo, xfs_dir2_dataptr_to_byte(dp));
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}
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/*
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* Convert byte in space to offset in a block
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*/
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static inline xfs_dir2_data_aoff_t
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xfs_dir2_byte_to_off(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
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{
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return (xfs_dir2_data_aoff_t)(by & (geo->blksize - 1));
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}
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/*
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* Convert dataptr to a byte offset in a block
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*/
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static inline xfs_dir2_data_aoff_t
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xfs_dir2_dataptr_to_off(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp)
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{
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return xfs_dir2_byte_to_off(geo, xfs_dir2_dataptr_to_byte(dp));
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}
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/*
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* Convert block and offset to byte in space
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*/
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static inline xfs_dir2_off_t
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xfs_dir2_db_off_to_byte(struct xfs_da_geometry *geo, xfs_dir2_db_t db,
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xfs_dir2_data_aoff_t o)
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{
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return ((xfs_dir2_off_t)db << geo->blklog) + o;
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}
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/*
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* Convert block (DB) to block (dablk)
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*/
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static inline xfs_dablk_t
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xfs_dir2_db_to_da(struct xfs_da_geometry *geo, xfs_dir2_db_t db)
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{
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return (xfs_dablk_t)(db << (geo->blklog - geo->fsblog));
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}
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/*
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* Convert byte in space to (DA) block
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*/
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static inline xfs_dablk_t
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xfs_dir2_byte_to_da(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
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{
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return xfs_dir2_db_to_da(geo, xfs_dir2_byte_to_db(geo, by));
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}
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/*
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* Convert block and offset to dataptr
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*/
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static inline xfs_dir2_dataptr_t
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xfs_dir2_db_off_to_dataptr(struct xfs_da_geometry *geo, xfs_dir2_db_t db,
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xfs_dir2_data_aoff_t o)
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{
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return xfs_dir2_byte_to_dataptr(xfs_dir2_db_off_to_byte(geo, db, o));
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}
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/*
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* Convert block (dablk) to block (DB)
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*/
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static inline xfs_dir2_db_t
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xfs_dir2_da_to_db(struct xfs_da_geometry *geo, xfs_dablk_t da)
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{
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return (xfs_dir2_db_t)(da >> (geo->blklog - geo->fsblog));
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}
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/*
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* Convert block (dablk) to byte offset in space
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*/
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static inline xfs_dir2_off_t
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xfs_dir2_da_to_byte(struct xfs_da_geometry *geo, xfs_dablk_t da)
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{
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return xfs_dir2_db_off_to_byte(geo, xfs_dir2_da_to_db(geo, da), 0);
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}
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/*
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* Directory tail pointer accessor functions. Based on block geometry.
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*/
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static inline struct xfs_dir2_block_tail *
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xfs_dir2_block_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_data_hdr *hdr)
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{
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return ((struct xfs_dir2_block_tail *)
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((char *)hdr + geo->blksize)) - 1;
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}
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static inline struct xfs_dir2_leaf_tail *
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xfs_dir2_leaf_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_leaf *lp)
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{
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return (struct xfs_dir2_leaf_tail *)
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((char *)lp + geo->blksize -
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sizeof(struct xfs_dir2_leaf_tail));
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}
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/*
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* The Linux API doesn't pass down the total size of the buffer
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* we read into down to the filesystem. With the filldir concept
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* it's not needed for correct information, but the XFS dir2 leaf
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* code wants an estimate of the buffer size to calculate it's
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* readahead window and size the buffers used for mapping to
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* physical blocks.
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*
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* Try to give it an estimate that's good enough, maybe at some
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* point we can change the ->readdir prototype to include the
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* buffer size. For now we use the current glibc buffer size.
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* musl libc hardcodes 2k and dietlibc uses PAGE_SIZE.
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*/
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#define XFS_READDIR_BUFSIZE (32768)
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unsigned char xfs_dir3_get_dtype(struct xfs_mount *mp, uint8_t filetype);
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void *xfs_dir3_data_endp(struct xfs_da_geometry *geo,
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struct xfs_dir2_data_hdr *hdr);
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bool xfs_dir2_namecheck(const void *name, size_t length);
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#endif /* __XFS_DIR2_H__ */
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