xfs_dir2.h (7534B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. 4 * All Rights Reserved. 5 */ 6#ifndef __XFS_DIR2_H__ 7#define __XFS_DIR2_H__ 8 9#include "xfs_da_format.h" 10#include "xfs_da_btree.h" 11 12struct xfs_da_args; 13struct xfs_inode; 14struct xfs_mount; 15struct xfs_trans; 16struct xfs_dir2_sf_hdr; 17struct xfs_dir2_sf_entry; 18struct xfs_dir2_data_hdr; 19struct xfs_dir2_data_entry; 20struct xfs_dir2_data_unused; 21struct xfs_dir3_icfree_hdr; 22struct xfs_dir3_icleaf_hdr; 23 24extern const struct xfs_name xfs_name_dotdot; 25 26/* 27 * Convert inode mode to directory entry filetype 28 */ 29extern unsigned char xfs_mode_to_ftype(int mode); 30 31/* 32 * Generic directory interface routines 33 */ 34extern void xfs_dir_startup(void); 35extern int xfs_da_mount(struct xfs_mount *mp); 36extern void xfs_da_unmount(struct xfs_mount *mp); 37 38extern int xfs_dir_isempty(struct xfs_inode *dp); 39extern int xfs_dir_init(struct xfs_trans *tp, struct xfs_inode *dp, 40 struct xfs_inode *pdp); 41extern int xfs_dir_createname(struct xfs_trans *tp, struct xfs_inode *dp, 42 const struct xfs_name *name, xfs_ino_t inum, 43 xfs_extlen_t tot); 44extern int xfs_dir_lookup(struct xfs_trans *tp, struct xfs_inode *dp, 45 const struct xfs_name *name, xfs_ino_t *inum, 46 struct xfs_name *ci_name); 47extern int xfs_dir_removename(struct xfs_trans *tp, struct xfs_inode *dp, 48 struct xfs_name *name, xfs_ino_t ino, 49 xfs_extlen_t tot); 50extern int xfs_dir_replace(struct xfs_trans *tp, struct xfs_inode *dp, 51 const struct xfs_name *name, xfs_ino_t inum, 52 xfs_extlen_t tot); 53extern int xfs_dir_canenter(struct xfs_trans *tp, struct xfs_inode *dp, 54 struct xfs_name *name); 55 56/* 57 * Direct call from the bmap code, bypassing the generic directory layer. 58 */ 59extern int xfs_dir2_sf_to_block(struct xfs_da_args *args); 60 61/* 62 * Interface routines used by userspace utilities 63 */ 64extern int xfs_dir2_isblock(struct xfs_da_args *args, int *r); 65extern int xfs_dir2_isleaf(struct xfs_da_args *args, int *r); 66extern int xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db, 67 struct xfs_buf *bp); 68 69extern void xfs_dir2_data_freescan(struct xfs_mount *mp, 70 struct xfs_dir2_data_hdr *hdr, int *loghead); 71extern void xfs_dir2_data_log_entry(struct xfs_da_args *args, 72 struct xfs_buf *bp, struct xfs_dir2_data_entry *dep); 73extern void xfs_dir2_data_log_header(struct xfs_da_args *args, 74 struct xfs_buf *bp); 75extern void xfs_dir2_data_log_unused(struct xfs_da_args *args, 76 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup); 77extern void xfs_dir2_data_make_free(struct xfs_da_args *args, 78 struct xfs_buf *bp, xfs_dir2_data_aoff_t offset, 79 xfs_dir2_data_aoff_t len, int *needlogp, int *needscanp); 80extern int xfs_dir2_data_use_free(struct xfs_da_args *args, 81 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup, 82 xfs_dir2_data_aoff_t offset, xfs_dir2_data_aoff_t len, 83 int *needlogp, int *needscanp); 84 85extern struct xfs_dir2_data_free *xfs_dir2_data_freefind( 86 struct xfs_dir2_data_hdr *hdr, struct xfs_dir2_data_free *bf, 87 struct xfs_dir2_data_unused *dup); 88 89extern int xfs_dir_ino_validate(struct xfs_mount *mp, xfs_ino_t ino); 90 91extern const struct xfs_buf_ops xfs_dir3_block_buf_ops; 92extern const struct xfs_buf_ops xfs_dir3_leafn_buf_ops; 93extern const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops; 94extern const struct xfs_buf_ops xfs_dir3_free_buf_ops; 95extern const struct xfs_buf_ops xfs_dir3_data_buf_ops; 96 97/* 98 * Directory offset/block conversion functions. 99 * 100 * DB blocks here are logical directory block numbers, not filesystem blocks. 101 */ 102 103/* 104 * Convert dataptr to byte in file space 105 */ 106static inline xfs_dir2_off_t 107xfs_dir2_dataptr_to_byte(xfs_dir2_dataptr_t dp) 108{ 109 return (xfs_dir2_off_t)dp << XFS_DIR2_DATA_ALIGN_LOG; 110} 111 112/* 113 * Convert byte in file space to dataptr. It had better be aligned. 114 */ 115static inline xfs_dir2_dataptr_t 116xfs_dir2_byte_to_dataptr(xfs_dir2_off_t by) 117{ 118 return (xfs_dir2_dataptr_t)(by >> XFS_DIR2_DATA_ALIGN_LOG); 119} 120 121/* 122 * Convert byte in space to (DB) block 123 */ 124static inline xfs_dir2_db_t 125xfs_dir2_byte_to_db(struct xfs_da_geometry *geo, xfs_dir2_off_t by) 126{ 127 return (xfs_dir2_db_t)(by >> geo->blklog); 128} 129 130/* 131 * Convert dataptr to a block number 132 */ 133static inline xfs_dir2_db_t 134xfs_dir2_dataptr_to_db(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp) 135{ 136 return xfs_dir2_byte_to_db(geo, xfs_dir2_dataptr_to_byte(dp)); 137} 138 139/* 140 * Convert byte in space to offset in a block 141 */ 142static inline xfs_dir2_data_aoff_t 143xfs_dir2_byte_to_off(struct xfs_da_geometry *geo, xfs_dir2_off_t by) 144{ 145 return (xfs_dir2_data_aoff_t)(by & (geo->blksize - 1)); 146} 147 148/* 149 * Convert dataptr to a byte offset in a block 150 */ 151static inline xfs_dir2_data_aoff_t 152xfs_dir2_dataptr_to_off(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp) 153{ 154 return xfs_dir2_byte_to_off(geo, xfs_dir2_dataptr_to_byte(dp)); 155} 156 157/* 158 * Convert block and offset to byte in space 159 */ 160static inline xfs_dir2_off_t 161xfs_dir2_db_off_to_byte(struct xfs_da_geometry *geo, xfs_dir2_db_t db, 162 xfs_dir2_data_aoff_t o) 163{ 164 return ((xfs_dir2_off_t)db << geo->blklog) + o; 165} 166 167/* 168 * Convert block (DB) to block (dablk) 169 */ 170static inline xfs_dablk_t 171xfs_dir2_db_to_da(struct xfs_da_geometry *geo, xfs_dir2_db_t db) 172{ 173 return (xfs_dablk_t)(db << (geo->blklog - geo->fsblog)); 174} 175 176/* 177 * Convert byte in space to (DA) block 178 */ 179static inline xfs_dablk_t 180xfs_dir2_byte_to_da(struct xfs_da_geometry *geo, xfs_dir2_off_t by) 181{ 182 return xfs_dir2_db_to_da(geo, xfs_dir2_byte_to_db(geo, by)); 183} 184 185/* 186 * Convert block and offset to dataptr 187 */ 188static inline xfs_dir2_dataptr_t 189xfs_dir2_db_off_to_dataptr(struct xfs_da_geometry *geo, xfs_dir2_db_t db, 190 xfs_dir2_data_aoff_t o) 191{ 192 return xfs_dir2_byte_to_dataptr(xfs_dir2_db_off_to_byte(geo, db, o)); 193} 194 195/* 196 * Convert block (dablk) to block (DB) 197 */ 198static inline xfs_dir2_db_t 199xfs_dir2_da_to_db(struct xfs_da_geometry *geo, xfs_dablk_t da) 200{ 201 return (xfs_dir2_db_t)(da >> (geo->blklog - geo->fsblog)); 202} 203 204/* 205 * Convert block (dablk) to byte offset in space 206 */ 207static inline xfs_dir2_off_t 208xfs_dir2_da_to_byte(struct xfs_da_geometry *geo, xfs_dablk_t da) 209{ 210 return xfs_dir2_db_off_to_byte(geo, xfs_dir2_da_to_db(geo, da), 0); 211} 212 213/* 214 * Directory tail pointer accessor functions. Based on block geometry. 215 */ 216static inline struct xfs_dir2_block_tail * 217xfs_dir2_block_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_data_hdr *hdr) 218{ 219 return ((struct xfs_dir2_block_tail *) 220 ((char *)hdr + geo->blksize)) - 1; 221} 222 223static inline struct xfs_dir2_leaf_tail * 224xfs_dir2_leaf_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_leaf *lp) 225{ 226 return (struct xfs_dir2_leaf_tail *) 227 ((char *)lp + geo->blksize - 228 sizeof(struct xfs_dir2_leaf_tail)); 229} 230 231/* 232 * The Linux API doesn't pass down the total size of the buffer 233 * we read into down to the filesystem. With the filldir concept 234 * it's not needed for correct information, but the XFS dir2 leaf 235 * code wants an estimate of the buffer size to calculate it's 236 * readahead window and size the buffers used for mapping to 237 * physical blocks. 238 * 239 * Try to give it an estimate that's good enough, maybe at some 240 * point we can change the ->readdir prototype to include the 241 * buffer size. For now we use the current glibc buffer size. 242 * musl libc hardcodes 2k and dietlibc uses PAGE_SIZE. 243 */ 244#define XFS_READDIR_BUFSIZE (32768) 245 246unsigned char xfs_dir3_get_dtype(struct xfs_mount *mp, uint8_t filetype); 247unsigned int xfs_dir3_data_end_offset(struct xfs_da_geometry *geo, 248 struct xfs_dir2_data_hdr *hdr); 249bool xfs_dir2_namecheck(const void *name, size_t length); 250 251#endif /* __XFS_DIR2_H__ */