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0cb97766f2
Add support for the file type field in directory entries so that readdir can return the type of the inode the dirent points to to userspace without first having to read the inode off disk. The encoding of the type field is a single byte that is added to the end of the directory entry name length. For all intents and purposes, it appends a "hidden" byte to the name field which contains the type information. As the directory entry is already of dynamic size, helpers are already required to access and decode the direct entry structures. Hence the relevent extraction and iteration helpers are updated to understand the hidden byte. Helpers for reading and writing the filetype field from the directory entries are also added. Only the read helpers are used by this patch. It also adds all the code necessary to read the type information out of the dirents on disk. Further we add the superblock feature bit and helpers to indicate that we understand the on-disk format change. This is not a compatible change - existing kernels cannot read the new format successfully - so an incompatible feature flag is added. We don't yet allow filesystems to mount with this flag yet - that will be added once write support is added. Finally, the code to take the type from the VFS, convert it to an XFS on-disk type and put it into the xfs_name structures passed around is added, but the directory code does not use this field yet. That will be in the next patch. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
106 lines
4.1 KiB
C
106 lines
4.1 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_H__
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#define __XFS_DIR2_H__
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struct xfs_bmap_free;
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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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extern struct xfs_name xfs_name_dotdot;
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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 void xfs_dir_mount(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_fsblock_t *first,
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struct xfs_bmap_free *flist, 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_fsblock_t *first,
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struct xfs_bmap_free *flist, 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_fsblock_t *first,
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struct xfs_bmap_free *flist, 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, uint resblks);
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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 xfs_ino_t xfs_dir2_sf_get_parent_ino(struct xfs_dir2_sf_hdr *sfp);
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extern void xfs_dir2_sf_put_parent_ino(struct xfs_dir2_sf_hdr *sfp,
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xfs_ino_t ino);
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extern xfs_ino_t xfs_dir3_sfe_get_ino(struct xfs_mount *mp,
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struct xfs_dir2_sf_hdr *sfp, struct xfs_dir2_sf_entry *sfep);
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extern void xfs_dir2_sfe_put_ino( struct xfs_dir2_sf_hdr *,
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struct xfs_dir2_sf_entry *sfep, xfs_ino_t ino);
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extern int xfs_dir2_isblock(struct xfs_trans *tp, struct xfs_inode *dp, int *r);
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extern int xfs_dir2_isleaf(struct xfs_trans *tp, struct xfs_inode *dp, 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(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_trans *tp, struct xfs_buf *bp,
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struct xfs_dir2_data_entry *dep);
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extern void xfs_dir2_data_log_header(struct xfs_trans *tp,
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struct xfs_buf *bp);
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extern void xfs_dir2_data_log_unused(struct xfs_trans *tp, struct xfs_buf *bp,
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struct xfs_dir2_data_unused *dup);
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extern void xfs_dir2_data_make_free(struct xfs_trans *tp, struct xfs_buf *bp,
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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 void xfs_dir2_data_use_free(struct xfs_trans *tp, struct xfs_buf *bp,
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struct xfs_dir2_data_unused *dup, 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 struct xfs_dir2_data_free *xfs_dir2_data_freefind(
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struct xfs_dir2_data_hdr *hdr, struct xfs_dir2_data_unused *dup);
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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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#endif /* __XFS_DIR2_H__ */
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