/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. * All Rights Reserved. */ #ifndef __XFS_DIR2_H__ #define __XFS_DIR2_H__ #include "xfs_da_format.h" #include "xfs_da_btree.h" struct xfs_da_args; struct xfs_inode; struct xfs_mount; struct xfs_trans; struct xfs_dir2_sf_hdr; struct xfs_dir2_sf_entry; struct xfs_dir2_data_hdr; struct xfs_dir2_data_entry; struct xfs_dir2_data_unused; struct xfs_dir3_icfree_hdr; struct xfs_dir3_icleaf_hdr; extern const struct xfs_name xfs_name_dotdot; extern const struct xfs_name xfs_name_dot; static inline bool xfs_dir2_samename( const struct xfs_name *n1, const struct xfs_name *n2) { … } enum xfs_dir2_fmt { … }; enum xfs_dir2_fmt xfs_dir2_format(struct xfs_da_args *args, int *error); /* * Convert inode mode to directory entry filetype */ extern unsigned char xfs_mode_to_ftype(int mode); /* * Generic directory interface routines */ extern void xfs_dir_startup(void); extern int xfs_da_mount(struct xfs_mount *mp); extern void xfs_da_unmount(struct xfs_mount *mp); extern int xfs_dir_isempty(struct xfs_inode *dp); extern int xfs_dir_init(struct xfs_trans *tp, struct xfs_inode *dp, struct xfs_inode *pdp); extern int xfs_dir_createname(struct xfs_trans *tp, struct xfs_inode *dp, const struct xfs_name *name, xfs_ino_t inum, xfs_extlen_t tot); extern int xfs_dir_lookup(struct xfs_trans *tp, struct xfs_inode *dp, const struct xfs_name *name, xfs_ino_t *inum, struct xfs_name *ci_name); extern int xfs_dir_removename(struct xfs_trans *tp, struct xfs_inode *dp, const struct xfs_name *name, xfs_ino_t ino, xfs_extlen_t tot); extern int xfs_dir_replace(struct xfs_trans *tp, struct xfs_inode *dp, const struct xfs_name *name, xfs_ino_t inum, xfs_extlen_t tot); extern int xfs_dir_canenter(struct xfs_trans *tp, struct xfs_inode *dp, const struct xfs_name *name); int xfs_dir_lookup_args(struct xfs_da_args *args); int xfs_dir_createname_args(struct xfs_da_args *args); int xfs_dir_removename_args(struct xfs_da_args *args); int xfs_dir_replace_args(struct xfs_da_args *args); /* * Direct call from the bmap code, bypassing the generic directory layer. */ extern int xfs_dir2_sf_to_block(struct xfs_da_args *args); /* * Interface routines used by userspace utilities */ extern int xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db, struct xfs_buf *bp); extern void xfs_dir2_data_freescan(struct xfs_mount *mp, struct xfs_dir2_data_hdr *hdr, int *loghead); extern void xfs_dir2_data_log_entry(struct xfs_da_args *args, struct xfs_buf *bp, struct xfs_dir2_data_entry *dep); extern void xfs_dir2_data_log_header(struct xfs_da_args *args, struct xfs_buf *bp); extern void xfs_dir2_data_log_unused(struct xfs_da_args *args, struct xfs_buf *bp, struct xfs_dir2_data_unused *dup); extern void xfs_dir2_data_make_free(struct xfs_da_args *args, struct xfs_buf *bp, xfs_dir2_data_aoff_t offset, xfs_dir2_data_aoff_t len, int *needlogp, int *needscanp); extern int xfs_dir2_data_use_free(struct xfs_da_args *args, struct xfs_buf *bp, struct xfs_dir2_data_unused *dup, xfs_dir2_data_aoff_t offset, xfs_dir2_data_aoff_t len, int *needlogp, int *needscanp); extern struct xfs_dir2_data_free *xfs_dir2_data_freefind( struct xfs_dir2_data_hdr *hdr, struct xfs_dir2_data_free *bf, struct xfs_dir2_data_unused *dup); extern int xfs_dir_ino_validate(struct xfs_mount *mp, xfs_ino_t ino); xfs_failaddr_t xfs_dir3_leaf_header_check(struct xfs_buf *bp, xfs_ino_t owner); xfs_failaddr_t xfs_dir3_data_header_check(struct xfs_buf *bp, xfs_ino_t owner); xfs_failaddr_t xfs_dir3_block_header_check(struct xfs_buf *bp, xfs_ino_t owner); extern const struct xfs_buf_ops xfs_dir3_block_buf_ops; extern const struct xfs_buf_ops xfs_dir3_leafn_buf_ops; extern const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops; extern const struct xfs_buf_ops xfs_dir3_free_buf_ops; extern const struct xfs_buf_ops xfs_dir3_data_buf_ops; /* * Directory offset/block conversion functions. * * DB blocks here are logical directory block numbers, not filesystem blocks. */ /* * Convert dataptr to byte in file space */ static inline xfs_dir2_off_t xfs_dir2_dataptr_to_byte(xfs_dir2_dataptr_t dp) { … } /* * Convert byte in file space to dataptr. It had better be aligned. */ static inline xfs_dir2_dataptr_t xfs_dir2_byte_to_dataptr(xfs_dir2_off_t by) { … } /* * Convert byte in space to (DB) block */ static inline xfs_dir2_db_t xfs_dir2_byte_to_db(struct xfs_da_geometry *geo, xfs_dir2_off_t by) { … } /* * Convert dataptr to a block number */ static inline xfs_dir2_db_t xfs_dir2_dataptr_to_db(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp) { … } /* * Convert byte in space to offset in a block */ static inline xfs_dir2_data_aoff_t xfs_dir2_byte_to_off(struct xfs_da_geometry *geo, xfs_dir2_off_t by) { … } /* * Convert dataptr to a byte offset in a block */ static inline xfs_dir2_data_aoff_t xfs_dir2_dataptr_to_off(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp) { … } /* * Convert block and offset to byte in space */ static inline xfs_dir2_off_t xfs_dir2_db_off_to_byte(struct xfs_da_geometry *geo, xfs_dir2_db_t db, xfs_dir2_data_aoff_t o) { … } /* * Convert block (DB) to block (dablk) */ static inline xfs_dablk_t xfs_dir2_db_to_da(struct xfs_da_geometry *geo, xfs_dir2_db_t db) { … } /* * Convert byte in space to (DA) block */ static inline xfs_dablk_t xfs_dir2_byte_to_da(struct xfs_da_geometry *geo, xfs_dir2_off_t by) { … } /* * Convert block and offset to dataptr */ static inline xfs_dir2_dataptr_t xfs_dir2_db_off_to_dataptr(struct xfs_da_geometry *geo, xfs_dir2_db_t db, xfs_dir2_data_aoff_t o) { … } /* * Convert block (dablk) to block (DB) */ static inline xfs_dir2_db_t xfs_dir2_da_to_db(struct xfs_da_geometry *geo, xfs_dablk_t da) { … } /* * Convert block (dablk) to byte offset in space */ static inline xfs_dir2_off_t xfs_dir2_da_to_byte(struct xfs_da_geometry *geo, xfs_dablk_t da) { … } /* * Directory tail pointer accessor functions. Based on block geometry. */ static inline struct xfs_dir2_block_tail * xfs_dir2_block_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_data_hdr *hdr) { … } static inline struct xfs_dir2_leaf_tail * xfs_dir2_leaf_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_leaf *lp) { … } /* * The Linux API doesn't pass down the total size of the buffer * we read into down to the filesystem. With the filldir concept * it's not needed for correct information, but the XFS dir2 leaf * code wants an estimate of the buffer size to calculate it's * readahead window and size the buffers used for mapping to * physical blocks. * * Try to give it an estimate that's good enough, maybe at some * point we can change the ->readdir prototype to include the * buffer size. For now we use the current glibc buffer size. * musl libc hardcodes 2k and dietlibc uses PAGE_SIZE. */ #define XFS_READDIR_BUFSIZE … unsigned char xfs_dir3_get_dtype(struct xfs_mount *mp, uint8_t filetype); unsigned int xfs_dir3_data_end_offset(struct xfs_da_geometry *geo, struct xfs_dir2_data_hdr *hdr); bool xfs_dir2_namecheck(const void *name, size_t length); /* * The "ascii-ci" feature was created to speed up case-insensitive lookups for * a Samba product. Because of the inherent problems with CI and UTF-8 * encoding, etc, it was decided that Samba would be configured to export * latin1/iso 8859-1 encodings as that covered >90% of the target markets for * the product. Hence the "ascii-ci" casefolding code could be encoded into * the XFS directory operations and remove all the overhead of casefolding from * Samba. * * To provide consistent hashing behavior between the userspace and kernel, * these functions prepare names for hashing by transforming specific bytes * to other bytes. Robustness with other encodings is not guaranteed. */ static inline bool xfs_ascii_ci_need_xfrm(unsigned char c) { … } static inline unsigned char xfs_ascii_ci_xfrm(unsigned char c) { … } struct xfs_dir_update_params { … }; #ifdef CONFIG_XFS_LIVE_HOOKS void xfs_dir_update_hook(struct xfs_inode *dp, struct xfs_inode *ip, int delta, const struct xfs_name *name); struct xfs_dir_hook { … }; void xfs_dir_hook_disable(void); void xfs_dir_hook_enable(void); int xfs_dir_hook_add(struct xfs_mount *mp, struct xfs_dir_hook *hook); void xfs_dir_hook_del(struct xfs_mount *mp, struct xfs_dir_hook *hook); void xfs_dir_hook_setup(struct xfs_dir_hook *hook, notifier_fn_t mod_fn); #else #define xfs_dir_update_hook … #endif /* CONFIG_XFS_LIVE_HOOKS */ struct xfs_parent_args; struct xfs_dir_update { … }; int xfs_dir_create_child(struct xfs_trans *tp, unsigned int resblks, struct xfs_dir_update *du); int xfs_dir_add_child(struct xfs_trans *tp, unsigned int resblks, struct xfs_dir_update *du); int xfs_dir_remove_child(struct xfs_trans *tp, unsigned int resblks, struct xfs_dir_update *du); int xfs_dir_exchange_children(struct xfs_trans *tp, struct xfs_dir_update *du1, struct xfs_dir_update *du2, unsigned int spaceres); int xfs_dir_rename_children(struct xfs_trans *tp, struct xfs_dir_update *du_src, struct xfs_dir_update *du_tgt, unsigned int spaceres, struct xfs_dir_update *du_wip); #endif /* __XFS_DIR2_H__ */
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