6ef4d6bf86
First of all some necessary notes about UFS by it self: To avoid waste of disk
space the tail of file consists not from blocks (which is ordinary big enough,
16K usually), it consists from fragments(which is ordinary 2K). When file is
growing its tail occupy 1 fragment, 2 fragments... At some stage decision to
allocate whole block is made and all fragments are moved to one block.
How this situation was handled before:
ufs_prepare_write
->block_prepare_write
->ufs_getfrag_block
->...
->ufs_new_fragments:
bh = sb_bread
bh->b_blocknr = result + i;
mark_buffer_dirty (bh);
This is wrong solution, because:
- it didn't take into consideration that there is another cache: "inode page
cache"
- because of sb_getblk uses not b_blocknr, (it uses page->index) to find
certain block, this breaks sb_getblk.
How this situation is handled now: we go though all "page inode cache", if
there are no such page in cache we load it into cache, and change b_blocknr.
Signed-off-by: Evgeniy Dushistov <dushistov@mail.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
891 lines
26 KiB
C
891 lines
26 KiB
C
/*
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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/capability.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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{
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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);
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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
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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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{
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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);
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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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static struct page *ufs_get_locked_page(struct address_space *mapping,
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unsigned long index)
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{
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struct page *page;
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try_again:
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page = find_lock_page(mapping, index);
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if (!page) {
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page = read_cache_page(mapping, index,
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(filler_t*)mapping->a_ops->readpage,
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NULL);
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if (IS_ERR(page)) {
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printk(KERN_ERR "ufs_change_blocknr: "
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"read_cache_page error: ino %lu, index: %lu\n",
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mapping->host->i_ino, index);
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goto out;
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}
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lock_page(page);
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if (!PageUptodate(page) || PageError(page)) {
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unlock_page(page);
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page_cache_release(page);
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printk(KERN_ERR "ufs_change_blocknr: "
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"can not read page: ino %lu, index: %lu\n",
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mapping->host->i_ino, index);
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page = ERR_PTR(-EIO);
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goto out;
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}
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}
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if (unlikely(!page->mapping || !page_has_buffers(page))) {
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unlock_page(page);
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page_cache_release(page);
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goto try_again;/*we really need these buffers*/
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}
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out:
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return page;
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}
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/*
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* Modify inode page cache in such way:
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* have - blocks with b_blocknr equal to oldb...oldb+count-1
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* get - blocks with b_blocknr equal to newb...newb+count-1
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* also we suppose that oldb...oldb+count-1 blocks
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* situated at the end of file.
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*
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* We can come here from ufs_writepage or ufs_prepare_write,
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* locked_page is argument of these functions, so we already lock it.
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*/
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static void ufs_change_blocknr(struct inode *inode, unsigned int count,
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unsigned int oldb, unsigned int newb,
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struct page *locked_page)
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{
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unsigned int blk_per_page = 1 << (PAGE_CACHE_SHIFT - inode->i_blkbits);
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sector_t baseblk;
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struct address_space *mapping = inode->i_mapping;
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pgoff_t index, cur_index = locked_page->index;
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unsigned int i, j;
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struct page *page;
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struct buffer_head *head, *bh;
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baseblk = ((i_size_read(inode) - 1) >> inode->i_blkbits) + 1 - count;
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UFSD(("ENTER, ino %lu, count %u, oldb %u, newb %u\n",
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inode->i_ino, count, oldb, newb));
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BUG_ON(!PageLocked(locked_page));
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for (i = 0; i < count; i += blk_per_page) {
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index = (baseblk+i) >> (PAGE_CACHE_SHIFT - inode->i_blkbits);
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if (likely(cur_index != index)) {
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page = ufs_get_locked_page(mapping, index);
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if (IS_ERR(page))
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continue;
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} else
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page = locked_page;
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j = i;
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head = page_buffers(page);
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bh = head;
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do {
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if (likely(bh->b_blocknr == j + oldb && j < count)) {
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unmap_underlying_metadata(bh->b_bdev,
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bh->b_blocknr);
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bh->b_blocknr = newb + j++;
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mark_buffer_dirty(bh);
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}
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bh = bh->b_this_page;
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} while (bh != head);
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set_page_dirty(page);
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if (likely(cur_index != index)) {
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unlock_page(page);
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page_cache_release(page);
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}
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}
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UFSD(("EXIT\n"));
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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, struct page *locked_page)
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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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unsigned cgno, oldcount, newcount, tmp, request, 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);
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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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}
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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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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 *
|
|
(uspi->s_minfree - 2) / 100)
|
|
break;
|
|
usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME);
|
|
break;
|
|
}
|
|
result = ufs_alloc_fragments (inode, cgno, goal, request, err);
|
|
if (result) {
|
|
ufs_change_blocknr(inode, oldcount, tmp, result, locked_page);
|
|
|
|
*p = cpu_to_fs32(sb, result);
|
|
*err = 0;
|
|
inode->i_blocks += count << uspi->s_nspfshift;
|
|
UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count);
|
|
unlock_super(sb);
|
|
if (newcount < request)
|
|
ufs_free_fragments (inode, result + newcount, request - newcount);
|
|
ufs_free_fragments (inode, tmp, oldcount);
|
|
UFSD(("EXIT, result %u\n", result))
|
|
return result;
|
|
}
|
|
|
|
unlock_super(sb);
|
|
UFSD(("EXIT (FAILED)\n"))
|
|
return 0;
|
|
}
|
|
|
|
static unsigned
|
|
ufs_add_fragments (struct inode * inode, unsigned fragment,
|
|
unsigned oldcount, unsigned newcount, 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 cgno, fragno, fragoff, count, fragsize, i;
|
|
|
|
UFSD(("ENTER, fragment %u, oldcount %u, newcount %u\n", fragment, oldcount, newcount))
|
|
|
|
sb = inode->i_sb;
|
|
uspi = UFS_SB(sb)->s_uspi;
|
|
usb1 = ubh_get_usb_first (uspi);
|
|
count = newcount - oldcount;
|
|
|
|
cgno = ufs_dtog(fragment);
|
|
if (fs32_to_cpu(sb, UFS_SB(sb)->fs_cs(cgno).cs_nffree) < count)
|
|
return 0;
|
|
if ((ufs_fragnum (fragment) + newcount) > uspi->s_fpb)
|
|
return 0;
|
|
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_add_fragments",
|
|
"internal error, bad magic number on cg %u", cgno);
|
|
return 0;
|
|
}
|
|
|
|
fragno = ufs_dtogd (fragment);
|
|
fragoff = ufs_fragnum (fragno);
|
|
for (i = oldcount; i < newcount; i++)
|
|
if (ubh_isclr (UCPI_UBH, ucpi->c_freeoff, fragno + i))
|
|
return 0;
|
|
/*
|
|
* Block can be extended
|
|
*/
|
|
ucg->cg_time = cpu_to_fs32(sb, get_seconds());
|
|
for (i = newcount; i < (uspi->s_fpb - fragoff); i++)
|
|
if (ubh_isclr (UCPI_UBH, ucpi->c_freeoff, fragno + i))
|
|
break;
|
|
fragsize = i - oldcount;
|
|
if (!fs32_to_cpu(sb, ucg->cg_frsum[fragsize]))
|
|
ufs_panic (sb, "ufs_add_fragments",
|
|
"internal error or corrupted bitmap on cg %u", cgno);
|
|
fs32_sub(sb, &ucg->cg_frsum[fragsize], 1);
|
|
if (fragsize != count)
|
|
fs32_add(sb, &ucg->cg_frsum[fragsize - count], 1);
|
|
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);
|
|
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);
|
|
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);
|
|
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,
|
|
};
|