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251 lines
7.4 KiB
251 lines
7.4 KiB
/* 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 const 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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* 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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const 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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const 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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const 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, bool *isblock); |
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extern int xfs_dir2_isleaf(struct xfs_da_args *args, bool *isleaf); |
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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(struct xfs_mount *mp, |
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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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unsigned int xfs_dir3_data_end_offset(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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