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354 lines
14 KiB
C
354 lines
14 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)lfs.h 8.3 (Berkeley) 9/23/93
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*/
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#define LFS_LABELPAD 8192 /* LFS label size */
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#define LFS_SBPAD 8192 /* LFS superblock size */
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/*
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* XXX
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* This is a kluge and NEEDS to go away.
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*
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* Right now, ufs code handles most of the calls for directory operations
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* such as create, mkdir, link, etc. As a result VOP_UPDATE is being
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* called with waitfor set (since ffs does these things synchronously).
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* Since LFS does not want to do these synchronously, we treat the last
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* argument to lfs_update as a set of flags. If LFS_SYNC is set, then
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* the update should be synchronous, if not, do it asynchronously.
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* Unfortunately, this means that LFS won't work with NFS yet because
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* NFS goes through paths that will make normal calls to ufs which will
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* call lfs with a last argument of 1.
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*/
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#define LFS_SYNC 0x02
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/* On-disk and in-memory checkpoint segment usage structure. */
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typedef struct segusage SEGUSE;
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struct segusage {
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u_long su_nbytes; /* number of live bytes */
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u_long su_lastmod; /* SEGUSE last modified timestamp */
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u_short su_nsums; /* number of summaries in segment */
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u_short su_ninos; /* number of inode blocks in seg */
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#define SEGUSE_ACTIVE 0x1 /* segment is currently being written */
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#define SEGUSE_DIRTY 0x2 /* segment has data in it */
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#define SEGUSE_SUPERBLOCK 0x4 /* segment contains a superblock */
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u_long su_flags;
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};
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#define SEGUPB(fs) (1 << (fs)->lfs_sushift)
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#define SEGTABSIZE_SU(fs) \
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(((fs)->lfs_nseg + SEGUPB(fs) - 1) >> (fs)->lfs_sushift)
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/* On-disk file information. One per file with data blocks in the segment. */
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typedef struct finfo FINFO;
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struct finfo {
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u_long fi_nblocks; /* number of blocks */
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u_long fi_version; /* version number */
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u_long fi_ino; /* inode number */
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long fi_blocks[1]; /* array of logical block numbers */
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};
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/* On-disk and in-memory super block. */
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struct lfs {
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#define LFS_MAGIC 0x070162
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u_long lfs_magic; /* magic number */
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#define LFS_VERSION 1
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u_long lfs_version; /* version number */
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u_long lfs_size; /* number of blocks in fs */
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u_long lfs_ssize; /* number of blocks per segment */
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u_long lfs_dsize; /* number of disk blocks in fs */
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u_long lfs_bsize; /* file system block size */
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u_long lfs_fsize; /* size of frag blocks in fs */
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u_long lfs_frag; /* number of frags in a block in fs */
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/* Checkpoint region. */
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ino_t lfs_free; /* start of the free list */
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u_long lfs_bfree; /* number of free disk blocks */
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u_long lfs_nfiles; /* number of allocated inodes */
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long lfs_avail; /* blocks available for writing */
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u_long lfs_uinodes; /* inodes in cache not yet on disk */
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daddr_t lfs_idaddr; /* inode file disk address */
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ino_t lfs_ifile; /* inode file inode number */
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daddr_t lfs_lastseg; /* address of last segment written */
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daddr_t lfs_nextseg; /* address of next segment to write */
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daddr_t lfs_curseg; /* current segment being written */
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daddr_t lfs_offset; /* offset in curseg for next partial */
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daddr_t lfs_lastpseg; /* address of last partial written */
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u_long lfs_tstamp; /* time stamp */
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/* These are configuration parameters. */
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u_long lfs_minfree; /* minimum percentage of free blocks */
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/* These fields can be computed from the others. */
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u_quad_t lfs_maxfilesize; /* maximum representable file size */
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u_long lfs_dbpseg; /* disk blocks per segment */
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u_long lfs_inopb; /* inodes per block */
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u_long lfs_ifpb; /* IFILE entries per block */
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u_long lfs_sepb; /* SEGUSE entries per block */
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u_long lfs_nindir; /* indirect pointers per block */
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u_long lfs_nseg; /* number of segments */
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u_long lfs_nspf; /* number of sectors per fragment */
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u_long lfs_cleansz; /* cleaner info size in blocks */
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u_long lfs_segtabsz; /* segment table size in blocks */
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u_long lfs_segmask; /* calculate offset within a segment */
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u_long lfs_segshift; /* fast mult/div for segments */
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u_long lfs_bmask; /* calc block offset from file offset */
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u_long lfs_bshift; /* calc block number from file offset */
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u_long lfs_ffmask; /* calc frag offset from file offset */
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u_long lfs_ffshift; /* fast mult/div for frag from file */
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u_long lfs_fbmask; /* calc frag offset from block offset */
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u_long lfs_fbshift; /* fast mult/div for frag from block */
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u_long lfs_fsbtodb; /* fsbtodb and dbtofsb shift constant */
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u_long lfs_sushift; /* fast mult/div for segusage table */
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#define LFS_MIN_SBINTERVAL 5 /* minimum superblock segment spacing */
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#define LFS_MAXNUMSB 10 /* superblock disk offsets */
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daddr_t lfs_sboffs[LFS_MAXNUMSB];
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/* These fields are set at mount time and are meaningless on disk. */
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struct segment *lfs_sp; /* current segment being written */
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struct vnode *lfs_ivnode; /* vnode for the ifile */
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u_long lfs_seglock; /* single-thread the segment writer */
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pid_t lfs_lockpid; /* pid of lock holder */
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u_long lfs_iocount; /* number of ios pending */
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u_long lfs_writer; /* don't allow any dirops to start */
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u_long lfs_dirops; /* count of active directory ops */
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u_long lfs_doifile; /* Write ifile blocks on next write */
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u_long lfs_nactive; /* Number of segments since last ckp */
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u_char lfs_fmod; /* super block modified flag */
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u_char lfs_clean; /* file system is clean flag */
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u_char lfs_ronly; /* mounted read-only flag */
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u_char lfs_flags; /* currently unused flag */
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u_char lfs_fsmnt[MNAMELEN]; /* name mounted on */
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u_char pad[3]; /* long-align */
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/* Checksum; valid on disk. */
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u_long lfs_cksum; /* checksum for superblock checking */
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};
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/*
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* Inode 0 is the out-of-band inode number, inode 1 is the inode number for
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* the IFILE, the root inode is 2 and the lost+found inode is 3.
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*/
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/* Fixed inode numbers. */
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#define LFS_UNUSED_INUM 0 /* out of band inode number */
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#define LFS_IFILE_INUM 1 /* IFILE inode number */
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#define LOSTFOUNDINO 3 /* lost+found inode number */
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#define LFS_FIRST_INUM 4 /* first free inode number */
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/* Address calculations for metadata located in the inode */
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#define S_INDIR(fs) -NDADDR
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#define D_INDIR(fs) (S_INDIR(fs) - NINDIR(fs) - 1)
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#define T_INDIR(fs) (D_INDIR(fs) - NINDIR(fs) * NINDIR(fs) - 1)
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/* Unassigned disk address. */
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#define UNASSIGNED -1
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/* Unused logical block number */
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#define LFS_UNUSED_LBN -1
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typedef struct ifile IFILE;
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struct ifile {
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u_long if_version; /* inode version number */
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#define LFS_UNUSED_DADDR 0 /* out-of-band daddr */
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daddr_t if_daddr; /* inode disk address */
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ino_t if_nextfree; /* next-unallocated inode */
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};
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/*
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* Cleaner information structure. This resides in the ifile and is used
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* to pass information between the cleaner and the kernel.
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*/
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typedef struct _cleanerinfo {
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u_long clean; /* K: number of clean segments */
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u_long dirty; /* K: number of dirty segments */
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} CLEANERINFO;
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#define CLEANSIZE_SU(fs) \
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((sizeof(CLEANERINFO) + (fs)->lfs_bsize - 1) >> (fs)->lfs_bshift)
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/*
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* All summary blocks are the same size, so we can always read a summary
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* block easily from a segment.
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*/
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#define LFS_SUMMARY_SIZE 512
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/* On-disk segment summary information */
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typedef struct segsum SEGSUM;
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struct segsum {
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u_long ss_sumsum; /* check sum of summary block */
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u_long ss_datasum; /* check sum of data */
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daddr_t ss_next; /* next segment */
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u_long ss_create; /* creation time stamp */
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u_short ss_nfinfo; /* number of file info structures */
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u_short ss_ninos; /* number of inodes in summary */
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#define SS_DIROP 0x01 /* segment begins a dirop */
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#define SS_CONT 0x02 /* more partials to finish this write*/
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u_short ss_flags; /* used for directory operations */
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u_short ss_pad; /* extra space */
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/* FINFO's and inode daddr's... */
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};
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/* NINDIR is the number of indirects in a file system block. */
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#define NINDIR(fs) ((fs)->lfs_nindir)
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/* INOPB is the number of inodes in a secondary storage block. */
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#define INOPB(fs) ((fs)->lfs_inopb)
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#define blksize(fs) ((fs)->lfs_bsize)
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#define blkoff(fs, loc) ((loc) & (fs)->lfs_bmask)
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#define fsbtodb(fs, b) ((b) << (fs)->lfs_fsbtodb)
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#define dbtofsb(fs, b) ((b) >> (fs)->lfs_fsbtodb)
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#define lblkno(fs, loc) ((loc) >> (fs)->lfs_bshift)
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#define lblktosize(fs, blk) ((blk) << (fs)->lfs_bshift)
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#define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \
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((loc) >> (fs)->lfs_bshift)
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#define datosn(fs, daddr) /* disk address to segment number */ \
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(((daddr) - (fs)->lfs_sboffs[0]) / fsbtodb((fs), (fs)->lfs_ssize))
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#define sntoda(fs, sn) /* segment number to disk address */ \
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((daddr_t)((sn) * ((fs)->lfs_ssize << (fs)->lfs_fsbtodb) + \
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(fs)->lfs_sboffs[0]))
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/* Read in the block with the cleaner info from the ifile. */
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#define LFS_CLEANERINFO(CP, F, BP) { \
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VTOI((F)->lfs_ivnode)->i_flag |= IN_ACCESS; \
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if (bread((F)->lfs_ivnode, \
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(daddr_t)0, (F)->lfs_bsize, NOCRED, &(BP))) \
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panic("lfs: ifile read"); \
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(CP) = (CLEANERINFO *)(BP)->b_data; \
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}
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/* Read in the block with a specific inode from the ifile. */
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#define LFS_IENTRY(IP, F, IN, BP) { \
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int _e; \
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VTOI((F)->lfs_ivnode)->i_flag |= IN_ACCESS; \
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if (_e = bread((F)->lfs_ivnode, \
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(IN) / (F)->lfs_ifpb + (F)->lfs_cleansz + (F)->lfs_segtabsz,\
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(F)->lfs_bsize, NOCRED, &(BP))) \
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panic("lfs: ifile read %d", _e); \
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(IP) = (IFILE *)(BP)->b_data + (IN) % (F)->lfs_ifpb; \
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}
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/* Read in the block with a specific segment usage entry from the ifile. */
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#define LFS_SEGENTRY(SP, F, IN, BP) { \
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int _e; \
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VTOI((F)->lfs_ivnode)->i_flag |= IN_ACCESS; \
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if (_e = bread((F)->lfs_ivnode, \
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((IN) >> (F)->lfs_sushift) + (F)->lfs_cleansz, \
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(F)->lfs_bsize, NOCRED, &(BP))) \
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panic("lfs: ifile read: %d", _e); \
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(SP) = (SEGUSE *)(BP)->b_data + ((IN) & (F)->lfs_sepb - 1); \
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}
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/*
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* Determine if there is enough room currently available to write db
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* disk blocks. We need enough blocks for the new blocks, the current,
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* inode blocks, a summary block, plus potentially the ifile inode and
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* the segment usage table, plus an ifile page.
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*/
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#define LFS_FITS(fs, db) \
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((long)((db + ((fs)->lfs_uinodes + INOPB((fs))) / INOPB((fs)) + \
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fsbtodb(fs, 1) + LFS_SUMMARY_SIZE / DEV_BSIZE + \
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(fs)->lfs_segtabsz)) < (fs)->lfs_avail)
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/* Determine if a buffer belongs to the ifile */
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#define IS_IFILE(bp) (VTOI(bp->b_vp)->i_number == LFS_IFILE_INUM)
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/*
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* Structures used by lfs_bmapv and lfs_markv to communicate information
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* about inodes and data blocks.
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*/
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typedef struct block_info {
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ino_t bi_inode; /* inode # */
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daddr_t bi_lbn; /* logical block w/in file */
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daddr_t bi_daddr; /* disk address of block */
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time_t bi_segcreate; /* origin segment create time */
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int bi_version; /* file version number */
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void *bi_bp; /* data buffer */
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} BLOCK_INFO;
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/* In-memory description of a segment about to be written. */
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struct segment {
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struct lfs *fs; /* file system pointer */
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struct buf **bpp; /* pointer to buffer array */
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struct buf **cbpp; /* pointer to next available bp */
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struct buf **start_bpp; /* pointer to first bp in this set */
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struct buf *ibp; /* buffer pointer to inode page */
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struct finfo *fip; /* current fileinfo pointer */
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struct vnode *vp; /* vnode being gathered */
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void *segsum; /* segment summary info */
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u_long ninodes; /* number of inodes in this segment */
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u_long seg_bytes_left; /* bytes left in segment */
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u_long sum_bytes_left; /* bytes left in summary block */
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u_long seg_number; /* number of this segment */
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daddr_t *start_lbp; /* beginning lbn for this set */
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#define SEGM_CKP 0x01 /* doing a checkpoint */
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#define SEGM_CLEAN 0x02 /* cleaner call; don't sort */
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#define SEGM_SYNC 0x04 /* wait for segment */
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u_long seg_flags; /* run-time flags for this segment */
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};
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#define ISSPACE(F, BB, C) \
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(((C)->cr_uid == 0 && (F)->lfs_bfree >= (BB)) || \
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((C)->cr_uid != 0 && IS_FREESPACE(F, BB)))
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#define IS_FREESPACE(F, BB) \
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((F)->lfs_bfree > ((F)->lfs_dsize * (F)->lfs_minfree / 100 + (BB)))
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#define ISSPACE_XXX(F, BB) \
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((F)->lfs_bfree >= (BB))
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#define DOSTATS
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#ifdef DOSTATS
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/* Statistics Counters */
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struct lfs_stats {
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int segsused;
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int psegwrites;
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int psyncwrites;
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int pcleanwrites;
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int blocktot;
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int cleanblocks;
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int ncheckpoints;
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int nwrites;
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int nsync_writes;
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int wait_exceeded;
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int write_exceeded;
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int flush_invoked;
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};
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extern struct lfs_stats lfs_stats;
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#endif
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