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![Dave Chinner](/assets/img/avatar_default.png)
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>
162 lines
5.4 KiB
C
162 lines
5.4 KiB
C
/*
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* Copyright (c) 2000-2005 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_TYPES_H__
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#define __XFS_TYPES_H__
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typedef __uint32_t prid_t; /* project ID */
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typedef __uint32_t xfs_agblock_t; /* blockno in alloc. group */
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typedef __uint32_t xfs_agino_t; /* inode # within allocation grp */
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typedef __uint32_t xfs_extlen_t; /* extent length in blocks */
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typedef __uint32_t xfs_agnumber_t; /* allocation group number */
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typedef __int32_t xfs_extnum_t; /* # of extents in a file */
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typedef __int16_t xfs_aextnum_t; /* # extents in an attribute fork */
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typedef __int64_t xfs_fsize_t; /* bytes in a file */
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typedef __uint64_t xfs_ufsize_t; /* unsigned bytes in a file */
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typedef __int32_t xfs_suminfo_t; /* type of bitmap summary info */
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typedef __int32_t xfs_rtword_t; /* word type for bitmap manipulations */
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typedef __int64_t xfs_lsn_t; /* log sequence number */
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typedef __int32_t xfs_tid_t; /* transaction identifier */
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typedef __uint32_t xfs_dablk_t; /* dir/attr block number (in file) */
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typedef __uint32_t xfs_dahash_t; /* dir/attr hash value */
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/*
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* These types are 64 bits on disk but are either 32 or 64 bits in memory.
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* Disk based types:
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*/
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typedef __uint64_t xfs_dfsbno_t; /* blockno in filesystem (agno|agbno) */
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typedef __uint64_t xfs_drfsbno_t; /* blockno in filesystem (raw) */
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typedef __uint64_t xfs_drtbno_t; /* extent (block) in realtime area */
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typedef __uint64_t xfs_dfiloff_t; /* block number in a file */
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typedef __uint64_t xfs_dfilblks_t; /* number of blocks in a file */
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/*
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* Memory based types are conditional.
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*/
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#if XFS_BIG_BLKNOS
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typedef __uint64_t xfs_fsblock_t; /* blockno in filesystem (agno|agbno) */
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typedef __uint64_t xfs_rfsblock_t; /* blockno in filesystem (raw) */
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typedef __uint64_t xfs_rtblock_t; /* extent (block) in realtime area */
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typedef __int64_t xfs_srtblock_t; /* signed version of xfs_rtblock_t */
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#else
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typedef __uint32_t xfs_fsblock_t; /* blockno in filesystem (agno|agbno) */
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typedef __uint32_t xfs_rfsblock_t; /* blockno in filesystem (raw) */
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typedef __uint32_t xfs_rtblock_t; /* extent (block) in realtime area */
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typedef __int32_t xfs_srtblock_t; /* signed version of xfs_rtblock_t */
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#endif
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typedef __uint64_t xfs_fileoff_t; /* block number in a file */
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typedef __int64_t xfs_sfiloff_t; /* signed block number in a file */
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typedef __uint64_t xfs_filblks_t; /* number of blocks in a file */
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/*
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* Null values for the types.
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*/
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#define NULLDFSBNO ((xfs_dfsbno_t)-1)
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#define NULLDRFSBNO ((xfs_drfsbno_t)-1)
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#define NULLDRTBNO ((xfs_drtbno_t)-1)
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#define NULLDFILOFF ((xfs_dfiloff_t)-1)
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#define NULLFSBLOCK ((xfs_fsblock_t)-1)
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#define NULLRFSBLOCK ((xfs_rfsblock_t)-1)
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#define NULLRTBLOCK ((xfs_rtblock_t)-1)
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#define NULLFILEOFF ((xfs_fileoff_t)-1)
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#define NULLAGBLOCK ((xfs_agblock_t)-1)
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#define NULLAGNUMBER ((xfs_agnumber_t)-1)
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#define NULLEXTNUM ((xfs_extnum_t)-1)
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#define NULLCOMMITLSN ((xfs_lsn_t)-1)
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#define NULLFSINO ((xfs_ino_t)-1)
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#define NULLAGINO ((xfs_agino_t)-1)
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/*
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* Max values for extlen, extnum, aextnum.
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*/
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#define MAXEXTLEN ((xfs_extlen_t)0x001fffff) /* 21 bits */
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#define MAXEXTNUM ((xfs_extnum_t)0x7fffffff) /* signed int */
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#define MAXAEXTNUM ((xfs_aextnum_t)0x7fff) /* signed short */
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/*
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* Minimum and maximum blocksize and sectorsize.
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* The blocksize upper limit is pretty much arbitrary.
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* The sectorsize upper limit is due to sizeof(sb_sectsize).
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*/
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#define XFS_MIN_BLOCKSIZE_LOG 9 /* i.e. 512 bytes */
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#define XFS_MAX_BLOCKSIZE_LOG 16 /* i.e. 65536 bytes */
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#define XFS_MIN_BLOCKSIZE (1 << XFS_MIN_BLOCKSIZE_LOG)
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#define XFS_MAX_BLOCKSIZE (1 << XFS_MAX_BLOCKSIZE_LOG)
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#define XFS_MIN_SECTORSIZE_LOG 9 /* i.e. 512 bytes */
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#define XFS_MAX_SECTORSIZE_LOG 15 /* i.e. 32768 bytes */
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#define XFS_MIN_SECTORSIZE (1 << XFS_MIN_SECTORSIZE_LOG)
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#define XFS_MAX_SECTORSIZE (1 << XFS_MAX_SECTORSIZE_LOG)
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/*
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* Inode fork identifiers.
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*/
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#define XFS_DATA_FORK 0
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#define XFS_ATTR_FORK 1
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/*
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* Min numbers of data/attr fork btree root pointers.
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*/
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#define MINDBTPTRS 3
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#define MINABTPTRS 2
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/*
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* MAXNAMELEN is the length (including the terminating null) of
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* the longest permissible file (component) name.
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*/
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#define MAXNAMELEN 256
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typedef enum {
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XFS_LOOKUP_EQi, XFS_LOOKUP_LEi, XFS_LOOKUP_GEi
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} xfs_lookup_t;
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typedef enum {
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XFS_BTNUM_BNOi, XFS_BTNUM_CNTi, XFS_BTNUM_BMAPi, XFS_BTNUM_INOi,
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XFS_BTNUM_MAX
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} xfs_btnum_t;
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struct xfs_name {
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const unsigned char *name;
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int len;
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int type;
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};
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/*
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* uid_t and gid_t are hard-coded to 32 bits in the inode.
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* Hence, an 'id' in a dquot is 32 bits..
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*/
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typedef __uint32_t xfs_dqid_t;
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/*
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* Constants for bit manipulations.
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*/
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#define XFS_NBBYLOG 3 /* log2(NBBY) */
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#define XFS_WORDLOG 2 /* log2(sizeof(xfs_rtword_t)) */
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#define XFS_NBWORDLOG (XFS_NBBYLOG + XFS_WORDLOG)
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#define XFS_NBWORD (1 << XFS_NBWORDLOG)
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#define XFS_WORDMASK ((1 << XFS_WORDLOG) - 1)
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#endif /* __XFS_TYPES_H__ */
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