179 lines
5.4 KiB
C
179 lines
5.4 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_DIR2_SF_H__
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#define __XFS_DIR2_SF_H__
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/*
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* Directory layout when stored internal to an inode.
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*
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* Small directories are packed as tightly as possible so as to
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* fit into the literal area of the inode.
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*/
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struct uio;
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struct xfs_dabuf;
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struct xfs_da_args;
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struct xfs_dir2_block;
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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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/*
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* Maximum size of a shortform directory.
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*/
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#define XFS_DIR2_SF_MAX_SIZE \
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(XFS_DINODE_MAX_SIZE - (uint)sizeof(xfs_dinode_core_t) - \
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(uint)sizeof(xfs_agino_t))
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/*
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* Inode number stored as 8 8-bit values.
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*/
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typedef struct { __uint8_t i[8]; } xfs_dir2_ino8_t;
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/*
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* Inode number stored as 4 8-bit values.
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* Works a lot of the time, when all the inode numbers in a directory
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* fit in 32 bits.
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*/
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typedef struct { __uint8_t i[4]; } xfs_dir2_ino4_t;
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typedef union {
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xfs_dir2_ino8_t i8;
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xfs_dir2_ino4_t i4;
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} xfs_dir2_inou_t;
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#define XFS_DIR2_MAX_SHORT_INUM ((xfs_ino_t)0xffffffffULL)
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/*
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* Normalized offset (in a data block) of the entry, really xfs_dir2_data_off_t.
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* Only need 16 bits, this is the byte offset into the single block form.
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*/
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typedef struct { __uint8_t i[2]; } xfs_dir2_sf_off_t;
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/*
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* The parent directory has a dedicated field, and the self-pointer must
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* be calculated on the fly.
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*
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* Entries are packed toward the top as tightly as possible. The header
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* and the elements must be memcpy'd out into a work area to get correct
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* alignment for the inode number fields.
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*/
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typedef struct xfs_dir2_sf_hdr {
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__uint8_t count; /* count of entries */
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__uint8_t i8count; /* count of 8-byte inode #s */
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xfs_dir2_inou_t parent; /* parent dir inode number */
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} xfs_dir2_sf_hdr_t;
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typedef struct xfs_dir2_sf_entry {
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__uint8_t namelen; /* actual name length */
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xfs_dir2_sf_off_t offset; /* saved offset */
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__uint8_t name[1]; /* name, variable size */
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xfs_dir2_inou_t inumber; /* inode number, var. offset */
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} xfs_dir2_sf_entry_t;
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typedef struct xfs_dir2_sf {
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xfs_dir2_sf_hdr_t hdr; /* shortform header */
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xfs_dir2_sf_entry_t list[1]; /* shortform entries */
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} xfs_dir2_sf_t;
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static inline int xfs_dir2_sf_hdr_size(int i8count)
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{
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return ((uint)sizeof(xfs_dir2_sf_hdr_t) - \
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((i8count) == 0) * \
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((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t)));
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}
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static inline xfs_dir2_inou_t *xfs_dir2_sf_inumberp(xfs_dir2_sf_entry_t *sfep)
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{
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return (xfs_dir2_inou_t *)&(sfep)->name[(sfep)->namelen];
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}
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static inline xfs_intino_t
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xfs_dir2_sf_get_inumber(xfs_dir2_sf_t *sfp, xfs_dir2_inou_t *from)
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{
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return ((sfp)->hdr.i8count == 0 ? \
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(xfs_intino_t)XFS_GET_DIR_INO4((from)->i4) : \
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(xfs_intino_t)XFS_GET_DIR_INO8((from)->i8));
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}
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static inline void xfs_dir2_sf_put_inumber(xfs_dir2_sf_t *sfp, xfs_ino_t *from,
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xfs_dir2_inou_t *to)
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{
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if ((sfp)->hdr.i8count == 0)
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XFS_PUT_DIR_INO4(*(from), (to)->i4);
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else
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XFS_PUT_DIR_INO8(*(from), (to)->i8);
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}
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static inline xfs_dir2_data_aoff_t
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xfs_dir2_sf_get_offset(xfs_dir2_sf_entry_t *sfep)
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{
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return INT_GET_UNALIGNED_16_BE(&(sfep)->offset.i);
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}
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static inline void
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xfs_dir2_sf_put_offset(xfs_dir2_sf_entry_t *sfep, xfs_dir2_data_aoff_t off)
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{
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INT_SET_UNALIGNED_16_BE(&(sfep)->offset.i, off);
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}
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static inline int xfs_dir2_sf_entsize_byname(xfs_dir2_sf_t *sfp, int len)
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{
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return ((uint)sizeof(xfs_dir2_sf_entry_t) - 1 + (len) - \
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((sfp)->hdr.i8count == 0) * \
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((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t)));
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}
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static inline int
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xfs_dir2_sf_entsize_byentry(xfs_dir2_sf_t *sfp, xfs_dir2_sf_entry_t *sfep)
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{
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return ((uint)sizeof(xfs_dir2_sf_entry_t) - 1 + (sfep)->namelen - \
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((sfp)->hdr.i8count == 0) * \
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((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t)));
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}
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static inline xfs_dir2_sf_entry_t *xfs_dir2_sf_firstentry(xfs_dir2_sf_t *sfp)
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{
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return ((xfs_dir2_sf_entry_t *) \
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((char *)(sfp) + xfs_dir2_sf_hdr_size(sfp->hdr.i8count)));
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}
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static inline xfs_dir2_sf_entry_t *
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xfs_dir2_sf_nextentry(xfs_dir2_sf_t *sfp, xfs_dir2_sf_entry_t *sfep)
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{
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return ((xfs_dir2_sf_entry_t *) \
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((char *)(sfep) + xfs_dir2_sf_entsize_byentry(sfp,sfep)));
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}
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/*
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* Functions.
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*/
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extern int xfs_dir2_block_sfsize(struct xfs_inode *dp,
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struct xfs_dir2_block *block,
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xfs_dir2_sf_hdr_t *sfhp);
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extern int xfs_dir2_block_to_sf(struct xfs_da_args *args, struct xfs_dabuf *bp,
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int size, xfs_dir2_sf_hdr_t *sfhp);
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extern int xfs_dir2_sf_addname(struct xfs_da_args *args);
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extern int xfs_dir2_sf_create(struct xfs_da_args *args, xfs_ino_t pino);
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extern int xfs_dir2_sf_getdents(struct xfs_inode *dp, void *dirent,
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xfs_off_t *offset, filldir_t filldir);
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extern int xfs_dir2_sf_lookup(struct xfs_da_args *args);
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extern int xfs_dir2_sf_removename(struct xfs_da_args *args);
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extern int xfs_dir2_sf_replace(struct xfs_da_args *args);
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#endif /* __XFS_DIR2_SF_H__ */
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