ca305f613f
ext2fs, inode numbers start at 1, so the maximum valid inode number is (s_inodes_per_group * s_groups_count), not one less. This is just a minimal change to avoid unnecessary panics and errors; some other related bugs that Bruce Evans mentioned to me are not addressed. Reviewed by: bde (ages ago)
540 lines
16 KiB
C
540 lines
16 KiB
C
/*
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* modified for Lites 1.1
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*
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* Aug 1995, Godmar Back (gback@cs.utah.edu)
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* University of Utah, Department of Computer Science
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*/
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/*
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* Copyright (c) 1982, 1986, 1989, 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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* @(#)ffs_alloc.c 8.8 (Berkeley) 2/21/94
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/vnode.h>
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#include <sys/stat.h>
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#include <sys/mount.h>
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#include <sys/syslog.h>
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#include <gnu/ext2fs/inode.h>
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#include <gnu/ext2fs/ext2_mount.h>
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#include <gnu/ext2fs/ext2_fs.h>
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#include <gnu/ext2fs/ext2_fs_sb.h>
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#include <gnu/ext2fs/fs.h>
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#include <gnu/ext2fs/ext2_extern.h>
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static void ext2_fserr(struct ext2_sb_info *, u_int, char *);
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/*
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* Linux calls this functions at the following locations:
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* (1) the inode is freed
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* (2) a preallocation miss occurs
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* (3) truncate is called
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* (4) release_file is called and f_mode & 2
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*
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* I call it in ext2_inactive, ext2_truncate, ext2_vfree and in (2)
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* the call in vfree might be redundant
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*/
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void
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ext2_discard_prealloc(ip)
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struct inode * ip;
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{
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#ifdef EXT2_PREALLOCATE
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if (ip->i_prealloc_count) {
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int i = ip->i_prealloc_count;
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ip->i_prealloc_count = 0;
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ext2_free_blocks (ITOV(ip)->v_mount,
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ip->i_prealloc_block,
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i);
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}
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#endif
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}
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/*
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* Allocate a block in the file system.
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*
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* this takes the framework from ffs_alloc. To implement the
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* actual allocation, it calls ext2_new_block, the ported version
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* of the same Linux routine.
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*
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* we note that this is always called in connection with ext2_blkpref
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*
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* preallocation is done as Linux does it
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*/
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int
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ext2_alloc(ip, lbn, bpref, size, cred, bnp)
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struct inode *ip;
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int32_t lbn, bpref;
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int size;
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struct ucred *cred;
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int32_t *bnp;
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{
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struct ext2_sb_info *fs;
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int32_t bno;
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*bnp = 0;
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fs = ip->i_e2fs;
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#if DIAGNOSTIC
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if ((u_int)size > fs->s_blocksize || blkoff(fs, size) != 0) {
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printf("dev = %s, bsize = %lu, size = %d, fs = %s\n",
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devtoname(ip->i_dev), fs->s_blocksize, size, fs->fs_fsmnt);
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panic("ext2_alloc: bad size");
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}
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if (cred == NOCRED)
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panic("ext2_alloc: missing credential");
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#endif /* DIAGNOSTIC */
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if (size == fs->s_blocksize && fs->s_es->s_free_blocks_count == 0)
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goto nospace;
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if (cred->cr_uid != 0 &&
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fs->s_es->s_free_blocks_count < fs->s_es->s_r_blocks_count)
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goto nospace;
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if (bpref >= fs->s_es->s_blocks_count)
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bpref = 0;
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/* call the Linux code */
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#ifdef EXT2_PREALLOCATE
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/* To have a preallocation hit, we must
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* - have at least one block preallocated
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* - and our preferred block must have that block number or one below
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*/
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if (ip->i_prealloc_count &&
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(bpref == ip->i_prealloc_block ||
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bpref + 1 == ip->i_prealloc_block))
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{
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bno = ip->i_prealloc_block++;
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ip->i_prealloc_count--;
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/* ext2_debug ("preallocation hit (%lu/%lu).\n",
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++alloc_hits, ++alloc_attempts); */
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/* Linux gets, clears, and releases the buffer at this
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point - we don't have to that; we leave it to the caller
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*/
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} else {
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ext2_discard_prealloc (ip);
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/* ext2_debug ("preallocation miss (%lu/%lu).\n",
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alloc_hits, ++alloc_attempts); */
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if (S_ISREG(ip->i_mode))
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bno = ext2_new_block
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(ITOV(ip)->v_mount, bpref,
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&ip->i_prealloc_count,
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&ip->i_prealloc_block);
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else
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bno = (int32_t)ext2_new_block(ITOV(ip)->v_mount,
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bpref, 0, 0);
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}
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#else
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bno = (int32_t)ext2_new_block(ITOV(ip)->v_mount, bpref, 0, 0);
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#endif
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if (bno > 0) {
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/* set next_alloc fields as done in block_getblk */
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ip->i_next_alloc_block = lbn;
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ip->i_next_alloc_goal = bno;
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ip->i_blocks += btodb(size);
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ip->i_flag |= IN_CHANGE | IN_UPDATE;
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*bnp = bno;
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return (0);
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}
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nospace:
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ext2_fserr(fs, cred->cr_uid, "file system full");
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uprintf("\n%s: write failed, file system is full\n", fs->fs_fsmnt);
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return (ENOSPC);
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}
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/*
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* Reallocate a sequence of blocks into a contiguous sequence of blocks.
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*
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* The vnode and an array of buffer pointers for a range of sequential
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* logical blocks to be made contiguous is given. The allocator attempts
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* to find a range of sequential blocks starting as close as possible to
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* an fs_rotdelay offset from the end of the allocation for the logical
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* block immediately preceding the current range. If successful, the
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* physical block numbers in the buffer pointers and in the inode are
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* changed to reflect the new allocation. If unsuccessful, the allocation
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* is left unchanged. The success in doing the reallocation is returned.
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* Note that the error return is not reflected back to the user. Rather
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* the previous block allocation will be used.
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*/
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#ifdef FANCY_REALLOC
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#include <sys/sysctl.h>
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static int doasyncfree = 1;
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#ifdef OPT_DEBUG
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SYSCTL_INT(_debug, 14, doasyncfree, CTLFLAG_RW, &doasyncfree, 0, "");
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#endif /* OPT_DEBUG */
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#endif
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int
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ext2_reallocblks(ap)
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struct vop_reallocblks_args /* {
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struct vnode *a_vp;
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struct cluster_save *a_buflist;
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} */ *ap;
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{
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#ifndef FANCY_REALLOC
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/* printf("ext2_reallocblks not implemented\n"); */
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return ENOSPC;
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#else
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struct ext2_sb_info *fs;
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struct inode *ip;
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struct vnode *vp;
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struct buf *sbp, *ebp;
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int32_t *bap, *sbap, *ebap;
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struct cluster_save *buflist;
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int32_t start_lbn, end_lbn, soff, eoff, newblk, blkno;
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struct indir start_ap[NIADDR + 1], end_ap[NIADDR + 1], *idp;
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int i, len, start_lvl, end_lvl, pref, ssize;
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vp = ap->a_vp;
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ip = VTOI(vp);
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fs = ip->i_e2fs;
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#ifdef UNKLAR
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if (fs->fs_contigsumsize <= 0)
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return (ENOSPC);
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#endif
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buflist = ap->a_buflist;
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len = buflist->bs_nchildren;
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start_lbn = buflist->bs_children[0]->b_lblkno;
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end_lbn = start_lbn + len - 1;
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#if DIAGNOSTIC
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for (i = 1; i < len; i++)
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if (buflist->bs_children[i]->b_lblkno != start_lbn + i)
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panic("ext2_reallocblks: non-cluster");
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#endif
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/*
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* If the latest allocation is in a new cylinder group, assume that
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* the filesystem has decided to move and do not force it back to
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* the previous cylinder group.
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*/
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if (dtog(fs, dbtofsb(fs, buflist->bs_children[0]->b_blkno)) !=
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dtog(fs, dbtofsb(fs, buflist->bs_children[len - 1]->b_blkno)))
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return (ENOSPC);
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if (ufs_getlbns(vp, start_lbn, start_ap, &start_lvl) ||
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ufs_getlbns(vp, end_lbn, end_ap, &end_lvl))
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return (ENOSPC);
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/*
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* Get the starting offset and block map for the first block.
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*/
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if (start_lvl == 0) {
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sbap = &ip->i_db[0];
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soff = start_lbn;
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} else {
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idp = &start_ap[start_lvl - 1];
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if (bread(vp, idp->in_lbn, (int)fs->s_blocksize, NOCRED, &sbp)) {
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brelse(sbp);
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return (ENOSPC);
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}
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sbap = (int32_t *)sbp->b_data;
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soff = idp->in_off;
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}
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/*
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* Find the preferred location for the cluster.
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*/
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pref = ext2_blkpref(ip, start_lbn, soff, sbap);
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/*
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* If the block range spans two block maps, get the second map.
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*/
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if (end_lvl == 0 || (idp = &end_ap[end_lvl - 1])->in_off + 1 >= len) {
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ssize = len;
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} else {
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#if DIAGNOSTIC
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if (start_ap[start_lvl-1].in_lbn == idp->in_lbn)
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panic("ext2_reallocblk: start == end");
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#endif
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ssize = len - (idp->in_off + 1);
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if (bread(vp, idp->in_lbn, (int)fs->s_blocksize, NOCRED, &ebp))
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goto fail;
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ebap = (int32_t *)ebp->b_data;
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}
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/*
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* Search the block map looking for an allocation of the desired size.
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*/
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if ((newblk = (int32_t)ext2_hashalloc(ip, dtog(fs, pref), (long)pref,
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len, (u_long (*)())ext2_clusteralloc)) == 0)
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goto fail;
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/*
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* We have found a new contiguous block.
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*
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* First we have to replace the old block pointers with the new
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* block pointers in the inode and indirect blocks associated
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* with the file.
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*/
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blkno = newblk;
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for (bap = &sbap[soff], i = 0; i < len; i++, blkno += fs->s_frags_per_block) {
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if (i == ssize)
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bap = ebap;
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#if DIAGNOSTIC
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if (buflist->bs_children[i]->b_blkno != fsbtodb(fs, *bap))
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panic("ext2_reallocblks: alloc mismatch");
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#endif
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*bap++ = blkno;
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}
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/*
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* Next we must write out the modified inode and indirect blocks.
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* For strict correctness, the writes should be synchronous since
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* the old block values may have been written to disk. In practise
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* they are almost never written, but if we are concerned about
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* strict correctness, the `doasyncfree' flag should be set to zero.
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*
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* The test on `doasyncfree' should be changed to test a flag
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* that shows whether the associated buffers and inodes have
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* been written. The flag should be set when the cluster is
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* started and cleared whenever the buffer or inode is flushed.
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* We can then check below to see if it is set, and do the
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* synchronous write only when it has been cleared.
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*/
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if (sbap != &ip->i_db[0]) {
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if (doasyncfree)
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bdwrite(sbp);
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else
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bwrite(sbp);
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} else {
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ip->i_flag |= IN_CHANGE | IN_UPDATE;
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if (!doasyncfree)
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ext2_update(vp, 1);
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}
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if (ssize < len)
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if (doasyncfree)
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bdwrite(ebp);
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else
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bwrite(ebp);
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/*
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* Last, free the old blocks and assign the new blocks to the buffers.
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*/
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for (blkno = newblk, i = 0; i < len; i++, blkno += fs->s_frags_per_block) {
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ext2_blkfree(ip, dbtofsb(fs, buflist->bs_children[i]->b_blkno),
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fs->s_blocksize);
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buflist->bs_children[i]->b_blkno = fsbtodb(fs, blkno);
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}
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return (0);
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fail:
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if (ssize < len)
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brelse(ebp);
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if (sbap != &ip->i_db[0])
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brelse(sbp);
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return (ENOSPC);
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#endif /* FANCY_REALLOC */
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}
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/*
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* Allocate an inode in the file system.
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*
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* we leave the actual allocation strategy to the (modified)
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* ext2_new_inode(), to make sure we get the policies right
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*/
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int
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ext2_valloc(pvp, mode, cred, vpp)
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struct vnode *pvp;
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int mode;
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struct ucred *cred;
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struct vnode **vpp;
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{
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struct inode *pip;
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struct ext2_sb_info *fs;
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struct inode *ip;
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ino_t ino;
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int i, error;
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*vpp = NULL;
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pip = VTOI(pvp);
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fs = pip->i_e2fs;
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if (fs->s_es->s_free_inodes_count == 0)
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goto noinodes;
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/* call the Linux routine - it returns the inode number only */
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ino = ext2_new_inode(pip, mode);
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if (ino == 0)
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goto noinodes;
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error = VFS_VGET(pvp->v_mount, ino, LK_EXCLUSIVE, vpp);
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if (error) {
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ext2_vfree(pvp, ino, mode);
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return (error);
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}
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ip = VTOI(*vpp);
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/*
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the question is whether using VGET was such good idea at all -
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Linux doesn't read the old inode in when it's allocating a
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new one. I will set at least i_size & i_blocks the zero.
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*/
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ip->i_mode = 0;
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ip->i_size = 0;
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ip->i_blocks = 0;
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ip->i_flags = 0;
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/* now we want to make sure that the block pointers are zeroed out */
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for (i = 0; i < NDADDR; i++)
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ip->i_db[i] = 0;
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for (i = 0; i < NIADDR; i++)
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ip->i_ib[i] = 0;
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/*
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* Set up a new generation number for this inode.
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* XXX check if this makes sense in ext2
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*/
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if (ip->i_gen == 0 || ++ip->i_gen == 0)
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ip->i_gen = random() / 2 + 1;
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/*
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printf("ext2_valloc: allocated inode %d\n", ino);
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*/
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return (0);
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noinodes:
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ext2_fserr(fs, cred->cr_uid, "out of inodes");
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uprintf("\n%s: create/symlink failed, no inodes free\n", fs->fs_fsmnt);
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return (ENOSPC);
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}
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|
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/*
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* Select the desired position for the next block in a file.
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*
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* we try to mimic what Remy does in inode_getblk/block_getblk
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*
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* we note: blocknr == 0 means that we're about to allocate either
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* a direct block or a pointer block at the first level of indirection
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* (In other words, stuff that will go in i_db[] or i_ib[])
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*
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* blocknr != 0 means that we're allocating a block that is none
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* of the above. Then, blocknr tells us the number of the block
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* that will hold the pointer
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*/
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int32_t
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ext2_blkpref(ip, lbn, indx, bap, blocknr)
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struct inode *ip;
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int32_t lbn;
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int indx;
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int32_t *bap;
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int32_t blocknr;
|
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{
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int tmp;
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/* if the next block is actually what we thought it is,
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then set the goal to what we thought it should be
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*/
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if(ip->i_next_alloc_block == lbn)
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return ip->i_next_alloc_goal;
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|
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/* now check whether we were provided with an array that basically
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tells us previous blocks to which we want to stay closeby
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*/
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if(bap)
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for (tmp = indx - 1; tmp >= 0; tmp--)
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if (bap[tmp])
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return bap[tmp];
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|
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/* else let's fall back to the blocknr, or, if there is none,
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follow the rule that a block should be allocated near its inode
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*/
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return blocknr ? blocknr :
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(int32_t)(ip->i_block_group *
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EXT2_BLOCKS_PER_GROUP(ip->i_e2fs)) +
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ip->i_e2fs->s_es->s_first_data_block;
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}
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/*
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* Free a block or fragment.
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*
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|
* pass on to the Linux code
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*/
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void
|
|
ext2_blkfree(ip, bno, size)
|
|
struct inode *ip;
|
|
int32_t bno;
|
|
long size;
|
|
{
|
|
struct ext2_sb_info *fs;
|
|
|
|
fs = ip->i_e2fs;
|
|
/*
|
|
* call Linux code with mount *, block number, count
|
|
*/
|
|
ext2_free_blocks(ITOV(ip)->v_mount, bno, size / fs->s_frag_size);
|
|
}
|
|
|
|
/*
|
|
* Free an inode.
|
|
*
|
|
* the maintenance of the actual bitmaps is again up to the linux code
|
|
*/
|
|
int
|
|
ext2_vfree(pvp, ino, mode)
|
|
struct vnode *pvp;
|
|
ino_t ino;
|
|
int mode;
|
|
{
|
|
struct ext2_sb_info *fs;
|
|
struct inode *pip;
|
|
mode_t save_i_mode;
|
|
|
|
pip = VTOI(pvp);
|
|
fs = pip->i_e2fs;
|
|
if ((u_int)ino > fs->s_inodes_per_group * fs->s_groups_count)
|
|
panic("ext2_vfree: range: dev = (%d, %d), ino = %d, fs = %s",
|
|
major(pip->i_dev), minor(pip->i_dev), ino, fs->fs_fsmnt);
|
|
|
|
/* ext2_debug("ext2_vfree (%d, %d) called\n", pip->i_number, mode);
|
|
*/
|
|
ext2_discard_prealloc(pip);
|
|
|
|
/* we need to make sure that ext2_free_inode can adjust the
|
|
used_dir_counts in the group summary information - I'd
|
|
really like to know what the rationale behind this
|
|
'set i_mode to zero to denote an unused inode' is
|
|
*/
|
|
save_i_mode = pip->i_mode;
|
|
pip->i_mode = mode;
|
|
ext2_free_inode(pip);
|
|
pip->i_mode = save_i_mode;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Fserr prints the name of a file system with an error diagnostic.
|
|
*
|
|
* The form of the error message is:
|
|
* fs: error message
|
|
*/
|
|
static void
|
|
ext2_fserr(fs, uid, cp)
|
|
struct ext2_sb_info *fs;
|
|
u_int uid;
|
|
char *cp;
|
|
{
|
|
|
|
log(LOG_ERR, "uid %d on %s: %s\n", uid, fs->fs_fsmnt, cp);
|
|
}
|