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814 lines
24 KiB
814 lines
24 KiB
/*
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* linux/fs/ufs/balloc.c
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*
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* Copyright (C) 1998
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* Daniel Pirkl <daniel.pirkl@email.cz>
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* Charles University, Faculty of Mathematics and Physics
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*/
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#include <linux/fs.h>
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#include <linux/ufs_fs.h>
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#include <linux/stat.h>
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#include <linux/time.h>
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#include <linux/string.h>
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#include <linux/quotaops.h>
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#include <linux/buffer_head.h>
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#include <linux/sched.h>
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#include <linux/bitops.h>
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#include <asm/byteorder.h>
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#include "swab.h"
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#include "util.h"
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#undef UFS_BALLOC_DEBUG
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#ifdef UFS_BALLOC_DEBUG
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#define UFSD(x) printk("(%s, %d), %s:", __FILE__, __LINE__, __FUNCTION__); printk x;
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#else
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#define UFSD(x)
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#endif
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static unsigned ufs_add_fragments (struct inode *, unsigned, unsigned, unsigned, int *);
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static unsigned ufs_alloc_fragments (struct inode *, unsigned, unsigned, unsigned, int *);
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static unsigned ufs_alloccg_block (struct inode *, struct ufs_cg_private_info *, unsigned, int *);
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static unsigned ufs_bitmap_search (struct super_block *, struct ufs_cg_private_info *, unsigned, unsigned);
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static unsigned char ufs_fragtable_8fpb[], ufs_fragtable_other[];
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static void ufs_clusteracct(struct super_block *, struct ufs_cg_private_info *, unsigned, int);
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/*
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* Free 'count' fragments from fragment number 'fragment'
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*/
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void ufs_free_fragments (struct inode * inode, unsigned fragment, unsigned count) {
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struct super_block * sb;
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struct ufs_sb_private_info * uspi;
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struct ufs_super_block_first * usb1;
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struct ufs_cg_private_info * ucpi;
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struct ufs_cylinder_group * ucg;
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unsigned cgno, bit, end_bit, bbase, blkmap, i, blkno, cylno;
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sb = inode->i_sb;
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uspi = UFS_SB(sb)->s_uspi;
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usb1 = ubh_get_usb_first(USPI_UBH);
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UFSD(("ENTER, fragment %u, count %u\n", fragment, count))
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if (ufs_fragnum(fragment) + count > uspi->s_fpg)
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ufs_error (sb, "ufs_free_fragments", "internal error");
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lock_super(sb);
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cgno = ufs_dtog(fragment);
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bit = ufs_dtogd(fragment);
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if (cgno >= uspi->s_ncg) {
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ufs_panic (sb, "ufs_free_fragments", "freeing blocks are outside device");
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goto failed;
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}
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ucpi = ufs_load_cylinder (sb, cgno);
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if (!ucpi)
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goto failed;
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ucg = ubh_get_ucg (UCPI_UBH);
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if (!ufs_cg_chkmagic(sb, ucg)) {
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ufs_panic (sb, "ufs_free_fragments", "internal error, bad magic number on cg %u", cgno);
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goto failed;
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}
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end_bit = bit + count;
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bbase = ufs_blknum (bit);
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blkmap = ubh_blkmap (UCPI_UBH, ucpi->c_freeoff, bbase);
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ufs_fragacct (sb, blkmap, ucg->cg_frsum, -1);
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for (i = bit; i < end_bit; i++) {
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if (ubh_isclr (UCPI_UBH, ucpi->c_freeoff, i))
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ubh_setbit (UCPI_UBH, ucpi->c_freeoff, i);
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else ufs_error (sb, "ufs_free_fragments",
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"bit already cleared for fragment %u", i);
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}
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DQUOT_FREE_BLOCK (inode, count);
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fs32_add(sb, &ucg->cg_cs.cs_nffree, count);
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fs32_add(sb, &usb1->fs_cstotal.cs_nffree, count);
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fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, count);
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blkmap = ubh_blkmap (UCPI_UBH, ucpi->c_freeoff, bbase);
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ufs_fragacct(sb, blkmap, ucg->cg_frsum, 1);
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/*
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* Trying to reassemble free fragments into block
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*/
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blkno = ufs_fragstoblks (bbase);
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if (ubh_isblockset(UCPI_UBH, ucpi->c_freeoff, blkno)) {
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fs32_sub(sb, &ucg->cg_cs.cs_nffree, uspi->s_fpb);
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fs32_sub(sb, &usb1->fs_cstotal.cs_nffree, uspi->s_fpb);
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fs32_sub(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, uspi->s_fpb);
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if ((UFS_SB(sb)->s_flags & UFS_CG_MASK) == UFS_CG_44BSD)
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ufs_clusteracct (sb, ucpi, blkno, 1);
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fs32_add(sb, &ucg->cg_cs.cs_nbfree, 1);
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fs32_add(sb, &usb1->fs_cstotal.cs_nbfree, 1);
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fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nbfree, 1);
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cylno = ufs_cbtocylno (bbase);
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fs16_add(sb, &ubh_cg_blks(ucpi, cylno, ufs_cbtorpos(bbase)), 1);
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fs32_add(sb, &ubh_cg_blktot(ucpi, cylno), 1);
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}
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ubh_mark_buffer_dirty (USPI_UBH);
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ubh_mark_buffer_dirty (UCPI_UBH);
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if (sb->s_flags & MS_SYNCHRONOUS) {
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ubh_ll_rw_block (SWRITE, 1, (struct ufs_buffer_head **)&ucpi);
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ubh_wait_on_buffer (UCPI_UBH);
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}
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sb->s_dirt = 1;
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unlock_super (sb);
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UFSD(("EXIT\n"))
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return;
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failed:
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unlock_super (sb);
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UFSD(("EXIT (FAILED)\n"))
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return;
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}
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/*
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* Free 'count' fragments from fragment number 'fragment' (free whole blocks)
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*/
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void ufs_free_blocks (struct inode * inode, unsigned fragment, unsigned count) {
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struct super_block * sb;
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struct ufs_sb_private_info * uspi;
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struct ufs_super_block_first * usb1;
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struct ufs_cg_private_info * ucpi;
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struct ufs_cylinder_group * ucg;
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unsigned overflow, cgno, bit, end_bit, blkno, i, cylno;
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sb = inode->i_sb;
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uspi = UFS_SB(sb)->s_uspi;
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usb1 = ubh_get_usb_first(USPI_UBH);
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UFSD(("ENTER, fragment %u, count %u\n", fragment, count))
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if ((fragment & uspi->s_fpbmask) || (count & uspi->s_fpbmask)) {
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ufs_error (sb, "ufs_free_blocks", "internal error, "
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"fragment %u, count %u\n", fragment, count);
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goto failed;
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}
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lock_super(sb);
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do_more:
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overflow = 0;
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cgno = ufs_dtog (fragment);
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bit = ufs_dtogd (fragment);
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if (cgno >= uspi->s_ncg) {
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ufs_panic (sb, "ufs_free_blocks", "freeing blocks are outside device");
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goto failed;
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}
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end_bit = bit + count;
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if (end_bit > uspi->s_fpg) {
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overflow = bit + count - uspi->s_fpg;
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count -= overflow;
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end_bit -= overflow;
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}
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ucpi = ufs_load_cylinder (sb, cgno);
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if (!ucpi)
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goto failed;
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ucg = ubh_get_ucg (UCPI_UBH);
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if (!ufs_cg_chkmagic(sb, ucg)) {
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ufs_panic (sb, "ufs_free_blocks", "internal error, bad magic number on cg %u", cgno);
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goto failed;
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}
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for (i = bit; i < end_bit; i += uspi->s_fpb) {
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blkno = ufs_fragstoblks(i);
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if (ubh_isblockset(UCPI_UBH, ucpi->c_freeoff, blkno)) {
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ufs_error(sb, "ufs_free_blocks", "freeing free fragment");
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}
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ubh_setblock(UCPI_UBH, ucpi->c_freeoff, blkno);
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if ((UFS_SB(sb)->s_flags & UFS_CG_MASK) == UFS_CG_44BSD)
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ufs_clusteracct (sb, ucpi, blkno, 1);
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DQUOT_FREE_BLOCK(inode, uspi->s_fpb);
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fs32_add(sb, &ucg->cg_cs.cs_nbfree, 1);
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fs32_add(sb, &usb1->fs_cstotal.cs_nbfree, 1);
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fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nbfree, 1);
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cylno = ufs_cbtocylno(i);
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fs16_add(sb, &ubh_cg_blks(ucpi, cylno, ufs_cbtorpos(i)), 1);
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fs32_add(sb, &ubh_cg_blktot(ucpi, cylno), 1);
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}
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ubh_mark_buffer_dirty (USPI_UBH);
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ubh_mark_buffer_dirty (UCPI_UBH);
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if (sb->s_flags & MS_SYNCHRONOUS) {
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ubh_ll_rw_block (SWRITE, 1, (struct ufs_buffer_head **)&ucpi);
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ubh_wait_on_buffer (UCPI_UBH);
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}
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if (overflow) {
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fragment += count;
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count = overflow;
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goto do_more;
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}
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sb->s_dirt = 1;
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unlock_super (sb);
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UFSD(("EXIT\n"))
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return;
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failed:
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unlock_super (sb);
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UFSD(("EXIT (FAILED)\n"))
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return;
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}
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#define NULLIFY_FRAGMENTS \
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for (i = oldcount; i < newcount; i++) { \
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bh = sb_getblk(sb, result + i); \
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memset (bh->b_data, 0, sb->s_blocksize); \
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set_buffer_uptodate(bh); \
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mark_buffer_dirty (bh); \
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if (IS_SYNC(inode)) \
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sync_dirty_buffer(bh); \
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brelse (bh); \
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}
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unsigned ufs_new_fragments (struct inode * inode, __fs32 * p, unsigned fragment,
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unsigned goal, unsigned count, int * err )
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{
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struct super_block * sb;
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struct ufs_sb_private_info * uspi;
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struct ufs_super_block_first * usb1;
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struct buffer_head * bh;
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unsigned cgno, oldcount, newcount, tmp, request, i, result;
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UFSD(("ENTER, ino %lu, fragment %u, goal %u, count %u\n", inode->i_ino, fragment, goal, count))
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sb = inode->i_sb;
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uspi = UFS_SB(sb)->s_uspi;
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usb1 = ubh_get_usb_first(USPI_UBH);
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*err = -ENOSPC;
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lock_super (sb);
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tmp = fs32_to_cpu(sb, *p);
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if (count + ufs_fragnum(fragment) > uspi->s_fpb) {
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ufs_warning (sb, "ufs_new_fragments", "internal warning"
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" fragment %u, count %u", fragment, count);
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count = uspi->s_fpb - ufs_fragnum(fragment);
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}
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oldcount = ufs_fragnum (fragment);
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newcount = oldcount + count;
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/*
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* Somebody else has just allocated our fragments
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*/
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if (oldcount) {
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if (!tmp) {
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ufs_error (sb, "ufs_new_fragments", "internal error, "
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"fragment %u, tmp %u\n", fragment, tmp);
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unlock_super (sb);
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return (unsigned)-1;
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}
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if (fragment < UFS_I(inode)->i_lastfrag) {
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UFSD(("EXIT (ALREADY ALLOCATED)\n"))
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unlock_super (sb);
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return 0;
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}
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}
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else {
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if (tmp) {
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UFSD(("EXIT (ALREADY ALLOCATED)\n"))
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unlock_super(sb);
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return 0;
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}
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}
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/*
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* There is not enough space for user on the device
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*/
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if (!capable(CAP_SYS_RESOURCE) && ufs_freespace(usb1, UFS_MINFREE) <= 0) {
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unlock_super (sb);
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UFSD(("EXIT (FAILED)\n"))
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return 0;
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}
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if (goal >= uspi->s_size)
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goal = 0;
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if (goal == 0)
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cgno = ufs_inotocg (inode->i_ino);
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else
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cgno = ufs_dtog (goal);
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/*
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* allocate new fragment
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*/
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if (oldcount == 0) {
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result = ufs_alloc_fragments (inode, cgno, goal, count, err);
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if (result) {
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*p = cpu_to_fs32(sb, result);
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*err = 0;
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inode->i_blocks += count << uspi->s_nspfshift;
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UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count);
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NULLIFY_FRAGMENTS
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}
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unlock_super(sb);
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UFSD(("EXIT, result %u\n", result))
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return result;
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}
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/*
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* resize block
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*/
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result = ufs_add_fragments (inode, tmp, oldcount, newcount, err);
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if (result) {
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*err = 0;
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inode->i_blocks += count << uspi->s_nspfshift;
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UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count);
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NULLIFY_FRAGMENTS
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unlock_super(sb);
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UFSD(("EXIT, result %u\n", result))
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return result;
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}
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/*
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* allocate new block and move data
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*/
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switch (fs32_to_cpu(sb, usb1->fs_optim)) {
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case UFS_OPTSPACE:
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request = newcount;
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if (uspi->s_minfree < 5 || fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree)
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> uspi->s_dsize * uspi->s_minfree / (2 * 100) )
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break;
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usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME);
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break;
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default:
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usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME);
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case UFS_OPTTIME:
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request = uspi->s_fpb;
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if (fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree) < uspi->s_dsize *
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(uspi->s_minfree - 2) / 100)
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break;
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usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME);
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break;
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}
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result = ufs_alloc_fragments (inode, cgno, goal, request, err);
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if (result) {
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for (i = 0; i < oldcount; i++) {
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bh = sb_bread(sb, tmp + i);
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if(bh)
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{
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clear_buffer_dirty(bh);
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bh->b_blocknr = result + i;
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mark_buffer_dirty (bh);
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if (IS_SYNC(inode))
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sync_dirty_buffer(bh);
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brelse (bh);
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}
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else
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{
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printk(KERN_ERR "ufs_new_fragments: bread fail\n");
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unlock_super(sb);
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return 0;
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}
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}
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*p = cpu_to_fs32(sb, result);
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*err = 0;
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inode->i_blocks += count << uspi->s_nspfshift;
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UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count);
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NULLIFY_FRAGMENTS
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unlock_super(sb);
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if (newcount < request)
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ufs_free_fragments (inode, result + newcount, request - newcount);
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ufs_free_fragments (inode, tmp, oldcount);
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UFSD(("EXIT, result %u\n", result))
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return result;
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}
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unlock_super(sb);
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UFSD(("EXIT (FAILED)\n"))
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return 0;
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}
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static unsigned
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ufs_add_fragments (struct inode * inode, unsigned fragment,
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unsigned oldcount, unsigned newcount, int * err)
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{
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struct super_block * sb;
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struct ufs_sb_private_info * uspi;
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struct ufs_super_block_first * usb1;
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struct ufs_cg_private_info * ucpi;
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struct ufs_cylinder_group * ucg;
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unsigned cgno, fragno, fragoff, count, fragsize, i;
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UFSD(("ENTER, fragment %u, oldcount %u, newcount %u\n", fragment, oldcount, newcount))
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sb = inode->i_sb;
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uspi = UFS_SB(sb)->s_uspi;
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usb1 = ubh_get_usb_first (USPI_UBH);
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count = newcount - oldcount;
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cgno = ufs_dtog(fragment);
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if (fs32_to_cpu(sb, UFS_SB(sb)->fs_cs(cgno).cs_nffree) < count)
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return 0;
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if ((ufs_fragnum (fragment) + newcount) > uspi->s_fpb)
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return 0;
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ucpi = ufs_load_cylinder (sb, cgno);
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if (!ucpi)
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return 0;
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ucg = ubh_get_ucg (UCPI_UBH);
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if (!ufs_cg_chkmagic(sb, ucg)) {
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ufs_panic (sb, "ufs_add_fragments",
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"internal error, bad magic number on cg %u", cgno);
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return 0;
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}
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fragno = ufs_dtogd (fragment);
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fragoff = ufs_fragnum (fragno);
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for (i = oldcount; i < newcount; i++)
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if (ubh_isclr (UCPI_UBH, ucpi->c_freeoff, fragno + i))
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return 0;
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/*
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* Block can be extended
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*/
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ucg->cg_time = cpu_to_fs32(sb, get_seconds());
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for (i = newcount; i < (uspi->s_fpb - fragoff); i++)
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if (ubh_isclr (UCPI_UBH, ucpi->c_freeoff, fragno + i))
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break;
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fragsize = i - oldcount;
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if (!fs32_to_cpu(sb, ucg->cg_frsum[fragsize]))
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ufs_panic (sb, "ufs_add_fragments",
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"internal error or corrupted bitmap on cg %u", cgno);
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fs32_sub(sb, &ucg->cg_frsum[fragsize], 1);
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if (fragsize != count)
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fs32_add(sb, &ucg->cg_frsum[fragsize - count], 1);
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for (i = oldcount; i < newcount; i++)
|
|
ubh_clrbit (UCPI_UBH, ucpi->c_freeoff, fragno + i);
|
|
if(DQUOT_ALLOC_BLOCK(inode, count)) {
|
|
*err = -EDQUOT;
|
|
return 0;
|
|
}
|
|
|
|
fs32_sub(sb, &ucg->cg_cs.cs_nffree, count);
|
|
fs32_sub(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, count);
|
|
fs32_sub(sb, &usb1->fs_cstotal.cs_nffree, count);
|
|
|
|
ubh_mark_buffer_dirty (USPI_UBH);
|
|
ubh_mark_buffer_dirty (UCPI_UBH);
|
|
if (sb->s_flags & MS_SYNCHRONOUS) {
|
|
ubh_ll_rw_block (SWRITE, 1, (struct ufs_buffer_head **)&ucpi);
|
|
ubh_wait_on_buffer (UCPI_UBH);
|
|
}
|
|
sb->s_dirt = 1;
|
|
|
|
UFSD(("EXIT, fragment %u\n", fragment))
|
|
|
|
return fragment;
|
|
}
|
|
|
|
#define UFS_TEST_FREE_SPACE_CG \
|
|
ucg = (struct ufs_cylinder_group *) UFS_SB(sb)->s_ucg[cgno]->b_data; \
|
|
if (fs32_to_cpu(sb, ucg->cg_cs.cs_nbfree)) \
|
|
goto cg_found; \
|
|
for (k = count; k < uspi->s_fpb; k++) \
|
|
if (fs32_to_cpu(sb, ucg->cg_frsum[k])) \
|
|
goto cg_found;
|
|
|
|
static unsigned ufs_alloc_fragments (struct inode * inode, unsigned cgno,
|
|
unsigned goal, unsigned count, int * err)
|
|
{
|
|
struct super_block * sb;
|
|
struct ufs_sb_private_info * uspi;
|
|
struct ufs_super_block_first * usb1;
|
|
struct ufs_cg_private_info * ucpi;
|
|
struct ufs_cylinder_group * ucg;
|
|
unsigned oldcg, i, j, k, result, allocsize;
|
|
|
|
UFSD(("ENTER, ino %lu, cgno %u, goal %u, count %u\n", inode->i_ino, cgno, goal, count))
|
|
|
|
sb = inode->i_sb;
|
|
uspi = UFS_SB(sb)->s_uspi;
|
|
usb1 = ubh_get_usb_first(USPI_UBH);
|
|
oldcg = cgno;
|
|
|
|
/*
|
|
* 1. searching on preferred cylinder group
|
|
*/
|
|
UFS_TEST_FREE_SPACE_CG
|
|
|
|
/*
|
|
* 2. quadratic rehash
|
|
*/
|
|
for (j = 1; j < uspi->s_ncg; j *= 2) {
|
|
cgno += j;
|
|
if (cgno >= uspi->s_ncg)
|
|
cgno -= uspi->s_ncg;
|
|
UFS_TEST_FREE_SPACE_CG
|
|
}
|
|
|
|
/*
|
|
* 3. brute force search
|
|
* We start at i = 2 ( 0 is checked at 1.step, 1 at 2.step )
|
|
*/
|
|
cgno = (oldcg + 1) % uspi->s_ncg;
|
|
for (j = 2; j < uspi->s_ncg; j++) {
|
|
cgno++;
|
|
if (cgno >= uspi->s_ncg)
|
|
cgno = 0;
|
|
UFS_TEST_FREE_SPACE_CG
|
|
}
|
|
|
|
UFSD(("EXIT (FAILED)\n"))
|
|
return 0;
|
|
|
|
cg_found:
|
|
ucpi = ufs_load_cylinder (sb, cgno);
|
|
if (!ucpi)
|
|
return 0;
|
|
ucg = ubh_get_ucg (UCPI_UBH);
|
|
if (!ufs_cg_chkmagic(sb, ucg))
|
|
ufs_panic (sb, "ufs_alloc_fragments",
|
|
"internal error, bad magic number on cg %u", cgno);
|
|
ucg->cg_time = cpu_to_fs32(sb, get_seconds());
|
|
|
|
if (count == uspi->s_fpb) {
|
|
result = ufs_alloccg_block (inode, ucpi, goal, err);
|
|
if (result == (unsigned)-1)
|
|
return 0;
|
|
goto succed;
|
|
}
|
|
|
|
for (allocsize = count; allocsize < uspi->s_fpb; allocsize++)
|
|
if (fs32_to_cpu(sb, ucg->cg_frsum[allocsize]) != 0)
|
|
break;
|
|
|
|
if (allocsize == uspi->s_fpb) {
|
|
result = ufs_alloccg_block (inode, ucpi, goal, err);
|
|
if (result == (unsigned)-1)
|
|
return 0;
|
|
goal = ufs_dtogd (result);
|
|
for (i = count; i < uspi->s_fpb; i++)
|
|
ubh_setbit (UCPI_UBH, ucpi->c_freeoff, goal + i);
|
|
i = uspi->s_fpb - count;
|
|
DQUOT_FREE_BLOCK(inode, i);
|
|
|
|
fs32_add(sb, &ucg->cg_cs.cs_nffree, i);
|
|
fs32_add(sb, &usb1->fs_cstotal.cs_nffree, i);
|
|
fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, i);
|
|
fs32_add(sb, &ucg->cg_frsum[i], 1);
|
|
goto succed;
|
|
}
|
|
|
|
result = ufs_bitmap_search (sb, ucpi, goal, allocsize);
|
|
if (result == (unsigned)-1)
|
|
return 0;
|
|
if(DQUOT_ALLOC_BLOCK(inode, count)) {
|
|
*err = -EDQUOT;
|
|
return 0;
|
|
}
|
|
for (i = 0; i < count; i++)
|
|
ubh_clrbit (UCPI_UBH, ucpi->c_freeoff, result + i);
|
|
|
|
fs32_sub(sb, &ucg->cg_cs.cs_nffree, count);
|
|
fs32_sub(sb, &usb1->fs_cstotal.cs_nffree, count);
|
|
fs32_sub(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, count);
|
|
fs32_sub(sb, &ucg->cg_frsum[allocsize], 1);
|
|
|
|
if (count != allocsize)
|
|
fs32_add(sb, &ucg->cg_frsum[allocsize - count], 1);
|
|
|
|
succed:
|
|
ubh_mark_buffer_dirty (USPI_UBH);
|
|
ubh_mark_buffer_dirty (UCPI_UBH);
|
|
if (sb->s_flags & MS_SYNCHRONOUS) {
|
|
ubh_ll_rw_block (SWRITE, 1, (struct ufs_buffer_head **)&ucpi);
|
|
ubh_wait_on_buffer (UCPI_UBH);
|
|
}
|
|
sb->s_dirt = 1;
|
|
|
|
result += cgno * uspi->s_fpg;
|
|
UFSD(("EXIT3, result %u\n", result))
|
|
return result;
|
|
}
|
|
|
|
static unsigned ufs_alloccg_block (struct inode * inode,
|
|
struct ufs_cg_private_info * ucpi, unsigned goal, int * err)
|
|
{
|
|
struct super_block * sb;
|
|
struct ufs_sb_private_info * uspi;
|
|
struct ufs_super_block_first * usb1;
|
|
struct ufs_cylinder_group * ucg;
|
|
unsigned result, cylno, blkno;
|
|
|
|
UFSD(("ENTER, goal %u\n", goal))
|
|
|
|
sb = inode->i_sb;
|
|
uspi = UFS_SB(sb)->s_uspi;
|
|
usb1 = ubh_get_usb_first(USPI_UBH);
|
|
ucg = ubh_get_ucg(UCPI_UBH);
|
|
|
|
if (goal == 0) {
|
|
goal = ucpi->c_rotor;
|
|
goto norot;
|
|
}
|
|
goal = ufs_blknum (goal);
|
|
goal = ufs_dtogd (goal);
|
|
|
|
/*
|
|
* If the requested block is available, use it.
|
|
*/
|
|
if (ubh_isblockset(UCPI_UBH, ucpi->c_freeoff, ufs_fragstoblks(goal))) {
|
|
result = goal;
|
|
goto gotit;
|
|
}
|
|
|
|
norot:
|
|
result = ufs_bitmap_search (sb, ucpi, goal, uspi->s_fpb);
|
|
if (result == (unsigned)-1)
|
|
return (unsigned)-1;
|
|
ucpi->c_rotor = result;
|
|
gotit:
|
|
blkno = ufs_fragstoblks(result);
|
|
ubh_clrblock (UCPI_UBH, ucpi->c_freeoff, blkno);
|
|
if ((UFS_SB(sb)->s_flags & UFS_CG_MASK) == UFS_CG_44BSD)
|
|
ufs_clusteracct (sb, ucpi, blkno, -1);
|
|
if(DQUOT_ALLOC_BLOCK(inode, uspi->s_fpb)) {
|
|
*err = -EDQUOT;
|
|
return (unsigned)-1;
|
|
}
|
|
|
|
fs32_sub(sb, &ucg->cg_cs.cs_nbfree, 1);
|
|
fs32_sub(sb, &usb1->fs_cstotal.cs_nbfree, 1);
|
|
fs32_sub(sb, &UFS_SB(sb)->fs_cs(ucpi->c_cgx).cs_nbfree, 1);
|
|
cylno = ufs_cbtocylno(result);
|
|
fs16_sub(sb, &ubh_cg_blks(ucpi, cylno, ufs_cbtorpos(result)), 1);
|
|
fs32_sub(sb, &ubh_cg_blktot(ucpi, cylno), 1);
|
|
|
|
UFSD(("EXIT, result %u\n", result))
|
|
|
|
return result;
|
|
}
|
|
|
|
static unsigned ufs_bitmap_search (struct super_block * sb,
|
|
struct ufs_cg_private_info * ucpi, unsigned goal, unsigned count)
|
|
{
|
|
struct ufs_sb_private_info * uspi;
|
|
struct ufs_super_block_first * usb1;
|
|
struct ufs_cylinder_group * ucg;
|
|
unsigned start, length, location, result;
|
|
unsigned possition, fragsize, blockmap, mask;
|
|
|
|
UFSD(("ENTER, cg %u, goal %u, count %u\n", ucpi->c_cgx, goal, count))
|
|
|
|
uspi = UFS_SB(sb)->s_uspi;
|
|
usb1 = ubh_get_usb_first (USPI_UBH);
|
|
ucg = ubh_get_ucg(UCPI_UBH);
|
|
|
|
if (goal)
|
|
start = ufs_dtogd(goal) >> 3;
|
|
else
|
|
start = ucpi->c_frotor >> 3;
|
|
|
|
length = ((uspi->s_fpg + 7) >> 3) - start;
|
|
location = ubh_scanc(UCPI_UBH, ucpi->c_freeoff + start, length,
|
|
(uspi->s_fpb == 8) ? ufs_fragtable_8fpb : ufs_fragtable_other,
|
|
1 << (count - 1 + (uspi->s_fpb & 7)));
|
|
if (location == 0) {
|
|
length = start + 1;
|
|
location = ubh_scanc(UCPI_UBH, ucpi->c_freeoff, length,
|
|
(uspi->s_fpb == 8) ? ufs_fragtable_8fpb : ufs_fragtable_other,
|
|
1 << (count - 1 + (uspi->s_fpb & 7)));
|
|
if (location == 0) {
|
|
ufs_error (sb, "ufs_bitmap_search",
|
|
"bitmap corrupted on cg %u, start %u, length %u, count %u, freeoff %u\n",
|
|
ucpi->c_cgx, start, length, count, ucpi->c_freeoff);
|
|
return (unsigned)-1;
|
|
}
|
|
start = 0;
|
|
}
|
|
result = (start + length - location) << 3;
|
|
ucpi->c_frotor = result;
|
|
|
|
/*
|
|
* found the byte in the map
|
|
*/
|
|
blockmap = ubh_blkmap(UCPI_UBH, ucpi->c_freeoff, result);
|
|
fragsize = 0;
|
|
for (possition = 0, mask = 1; possition < 8; possition++, mask <<= 1) {
|
|
if (blockmap & mask) {
|
|
if (!(possition & uspi->s_fpbmask))
|
|
fragsize = 1;
|
|
else
|
|
fragsize++;
|
|
}
|
|
else {
|
|
if (fragsize == count) {
|
|
result += possition - count;
|
|
UFSD(("EXIT, result %u\n", result))
|
|
return result;
|
|
}
|
|
fragsize = 0;
|
|
}
|
|
}
|
|
if (fragsize == count) {
|
|
result += possition - count;
|
|
UFSD(("EXIT, result %u\n", result))
|
|
return result;
|
|
}
|
|
ufs_error (sb, "ufs_bitmap_search", "block not in map on cg %u\n", ucpi->c_cgx);
|
|
UFSD(("EXIT (FAILED)\n"))
|
|
return (unsigned)-1;
|
|
}
|
|
|
|
static void ufs_clusteracct(struct super_block * sb,
|
|
struct ufs_cg_private_info * ucpi, unsigned blkno, int cnt)
|
|
{
|
|
struct ufs_sb_private_info * uspi;
|
|
int i, start, end, forw, back;
|
|
|
|
uspi = UFS_SB(sb)->s_uspi;
|
|
if (uspi->s_contigsumsize <= 0)
|
|
return;
|
|
|
|
if (cnt > 0)
|
|
ubh_setbit(UCPI_UBH, ucpi->c_clusteroff, blkno);
|
|
else
|
|
ubh_clrbit(UCPI_UBH, ucpi->c_clusteroff, blkno);
|
|
|
|
/*
|
|
* Find the size of the cluster going forward.
|
|
*/
|
|
start = blkno + 1;
|
|
end = start + uspi->s_contigsumsize;
|
|
if ( end >= ucpi->c_nclusterblks)
|
|
end = ucpi->c_nclusterblks;
|
|
i = ubh_find_next_zero_bit (UCPI_UBH, ucpi->c_clusteroff, end, start);
|
|
if (i > end)
|
|
i = end;
|
|
forw = i - start;
|
|
|
|
/*
|
|
* Find the size of the cluster going backward.
|
|
*/
|
|
start = blkno - 1;
|
|
end = start - uspi->s_contigsumsize;
|
|
if (end < 0 )
|
|
end = -1;
|
|
i = ubh_find_last_zero_bit (UCPI_UBH, ucpi->c_clusteroff, start, end);
|
|
if ( i < end)
|
|
i = end;
|
|
back = start - i;
|
|
|
|
/*
|
|
* Account for old cluster and the possibly new forward and
|
|
* back clusters.
|
|
*/
|
|
i = back + forw + 1;
|
|
if (i > uspi->s_contigsumsize)
|
|
i = uspi->s_contigsumsize;
|
|
fs32_add(sb, (__fs32*)ubh_get_addr(UCPI_UBH, ucpi->c_clustersumoff + (i << 2)), cnt);
|
|
if (back > 0)
|
|
fs32_sub(sb, (__fs32*)ubh_get_addr(UCPI_UBH, ucpi->c_clustersumoff + (back << 2)), cnt);
|
|
if (forw > 0)
|
|
fs32_sub(sb, (__fs32*)ubh_get_addr(UCPI_UBH, ucpi->c_clustersumoff + (forw << 2)), cnt);
|
|
}
|
|
|
|
|
|
static unsigned char ufs_fragtable_8fpb[] = {
|
|
0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04, 0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08,
|
|
0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10,
|
|
0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
|
|
0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, 0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20,
|
|
0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
|
|
0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
|
|
0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0A,
|
|
0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, 0x08, 0x09, 0x09, 0x0A, 0x10, 0x11, 0x20, 0x40,
|
|
0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
|
|
0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
|
|
0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
|
|
0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, 0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21,
|
|
0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0A,
|
|
0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, 0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0A, 0x12,
|
|
0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, 0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0C,
|
|
0x08, 0x09, 0x09, 0x0A, 0x09, 0x09, 0x0A, 0x0C, 0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80,
|
|
};
|
|
|
|
static unsigned char ufs_fragtable_other[] = {
|
|
0x00, 0x16, 0x16, 0x2A, 0x16, 0x16, 0x26, 0x4E, 0x16, 0x16, 0x16, 0x3E, 0x2A, 0x3E, 0x4E, 0x8A,
|
|
0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E,
|
|
0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E,
|
|
0x2A, 0x3E, 0x3E, 0x2A, 0x3E, 0x3E, 0x2E, 0x6E, 0x3E, 0x3E, 0x3E, 0x3E, 0x2A, 0x3E, 0x6E, 0xAA,
|
|
0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E,
|
|
0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E,
|
|
0x26, 0x36, 0x36, 0x2E, 0x36, 0x36, 0x26, 0x6E, 0x36, 0x36, 0x36, 0x3E, 0x2E, 0x3E, 0x6E, 0xAE,
|
|
0x4E, 0x5E, 0x5E, 0x6E, 0x5E, 0x5E, 0x6E, 0x4E, 0x5E, 0x5E, 0x5E, 0x7E, 0x6E, 0x7E, 0x4E, 0xCE,
|
|
0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E,
|
|
0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E,
|
|
0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E,
|
|
0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0xBE,
|
|
0x2A, 0x3E, 0x3E, 0x2A, 0x3E, 0x3E, 0x2E, 0x6E, 0x3E, 0x3E, 0x3E, 0x3E, 0x2A, 0x3E, 0x6E, 0xAA,
|
|
0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0xBE,
|
|
0x4E, 0x5E, 0x5E, 0x6E, 0x5E, 0x5E, 0x6E, 0x4E, 0x5E, 0x5E, 0x5E, 0x7E, 0x6E, 0x7E, 0x4E, 0xCE,
|
|
0x8A, 0x9E, 0x9E, 0xAA, 0x9E, 0x9E, 0xAE, 0xCE, 0x9E, 0x9E, 0x9E, 0xBE, 0xAA, 0xBE, 0xCE, 0x8A,
|
|
};
|
|
|