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9cb569d601
These flags aren't real I/O types, but tell ll_rw_block to always lock the buffer instead of giving up on a failed trylock. Instead add a new write_dirty_buffer helper that implements this semantic and use it from the existing SWRITE* callers. Note that the ll_rw_block code had a bug where it didn't promote WRITE_SYNC_PLUG properly, which this patch fixes. In the ufs code clean up the helper that used to call ll_rw_block to mirror sync_dirty_buffer, which is the function it implements for compound buffers. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
953 lines
27 KiB
C
953 lines
27 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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* UFS2 write support Evgeniy Dushistov <dushistov@mail.ru>, 2007
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*/
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#include <linux/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/buffer_head.h>
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#include <linux/capability.h>
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#include <linux/bitops.h>
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#include <asm/byteorder.h>
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#include "ufs_fs.h"
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#include "ufs.h"
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#include "swab.h"
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#include "util.h"
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#define INVBLOCK ((u64)-1L)
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static u64 ufs_add_fragments(struct inode *, u64, unsigned, unsigned, int *);
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static u64 ufs_alloc_fragments(struct inode *, unsigned, u64, unsigned, int *);
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static u64 ufs_alloccg_block(struct inode *, struct ufs_cg_private_info *, u64, int *);
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static u64 ufs_bitmap_search (struct super_block *, struct ufs_cg_private_info *, u64, 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, u64 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;
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u64 blkno;
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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 %llu, count %u\n",
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(unsigned long long)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(uspi, fragment);
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bit = ufs_dtogd(uspi, 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(ucpi));
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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), 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), ucpi->c_freeoff, i))
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ubh_setbit (UCPI_UBH(ucpi), 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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fs32_add(sb, &ucg->cg_cs.cs_nffree, count);
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uspi->cs_total.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), 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), ucpi->c_freeoff, blkno)) {
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fs32_sub(sb, &ucg->cg_cs.cs_nffree, uspi->s_fpb);
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uspi->cs_total.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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uspi->cs_total.cs_nbfree++;
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fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nbfree, 1);
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if (uspi->fs_magic != UFS2_MAGIC) {
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unsigned cylno = ufs_cbtocylno (bbase);
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fs16_add(sb, &ubh_cg_blks(ucpi, cylno,
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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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}
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ubh_mark_buffer_dirty (USPI_UBH(uspi));
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ubh_mark_buffer_dirty (UCPI_UBH(ucpi));
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if (sb->s_flags & MS_SYNCHRONOUS)
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ubh_sync_block(UCPI_UBH(ucpi));
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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, u64 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, i;
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u64 blkno;
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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 %llu, count %u\n",
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(unsigned long long)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 %llu, count %u\n",
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(unsigned long long)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(uspi, fragment);
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bit = ufs_dtogd(uspi, 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_unlock;
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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_unlock;
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ucg = ubh_get_ucg (UCPI_UBH(ucpi));
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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_unlock;
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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), 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), 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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fs32_add(sb, &ucg->cg_cs.cs_nbfree, 1);
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uspi->cs_total.cs_nbfree++;
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fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nbfree, 1);
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if (uspi->fs_magic != UFS2_MAGIC) {
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unsigned cylno = ufs_cbtocylno(i);
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fs16_add(sb, &ubh_cg_blks(ucpi, cylno,
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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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}
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ubh_mark_buffer_dirty (USPI_UBH(uspi));
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ubh_mark_buffer_dirty (UCPI_UBH(ucpi));
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if (sb->s_flags & MS_SYNCHRONOUS)
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ubh_sync_block(UCPI_UBH(ucpi));
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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_unlock:
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unlock_super (sb);
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failed:
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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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* 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, sector_t beg,
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unsigned int count, sector_t oldb,
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sector_t newb, struct page *locked_page)
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{
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const unsigned blks_per_page =
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1 << (PAGE_CACHE_SHIFT - inode->i_blkbits);
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const unsigned mask = blks_per_page - 1;
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struct address_space * const mapping = inode->i_mapping;
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pgoff_t index, cur_index, last_index;
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unsigned pos, j, lblock;
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sector_t end, i;
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struct page *page;
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struct buffer_head *head, *bh;
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UFSD("ENTER, ino %lu, count %u, oldb %llu, newb %llu\n",
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inode->i_ino, count,
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(unsigned long long)oldb, (unsigned long long)newb);
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BUG_ON(!locked_page);
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BUG_ON(!PageLocked(locked_page));
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cur_index = locked_page->index;
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end = count + beg;
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last_index = end >> (PAGE_CACHE_SHIFT - inode->i_blkbits);
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for (i = beg; i < end; i = (i | mask) + 1) {
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index = 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 (!page)/* it was truncated */
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continue;
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if (IS_ERR(page)) {/* or EIO */
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ufs_error(inode->i_sb, __func__,
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"read of page %llu failed\n",
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(unsigned long long)index);
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continue;
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}
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} else
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page = locked_page;
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head = page_buffers(page);
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bh = head;
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pos = i & mask;
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for (j = 0; j < pos; ++j)
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bh = bh->b_this_page;
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if (unlikely(index == last_index))
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lblock = end & mask;
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else
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lblock = blks_per_page;
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do {
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if (j >= lblock)
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break;
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pos = (i - beg) + j;
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if (!buffer_mapped(bh))
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map_bh(bh, inode->i_sb, oldb + pos);
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if (!buffer_uptodate(bh)) {
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ll_rw_block(READ, 1, &bh);
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wait_on_buffer(bh);
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if (!buffer_uptodate(bh)) {
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ufs_error(inode->i_sb, __func__,
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"read of block failed\n");
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break;
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}
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}
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UFSD(" change from %llu to %llu, pos %u\n",
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(unsigned long long)(pos + oldb),
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(unsigned long long)(pos + newb), pos);
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bh->b_blocknr = newb + pos;
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unmap_underlying_metadata(bh->b_bdev,
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bh->b_blocknr);
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mark_buffer_dirty(bh);
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++j;
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bh = bh->b_this_page;
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} while (bh != head);
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if (likely(cur_index != index))
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ufs_put_locked_page(page);
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}
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UFSD("EXIT\n");
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}
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static void ufs_clear_frags(struct inode *inode, sector_t beg, unsigned int n,
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int sync)
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{
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struct buffer_head *bh;
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sector_t end = beg + n;
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for (; beg < end; ++beg) {
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bh = sb_getblk(inode->i_sb, beg);
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lock_buffer(bh);
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memset(bh->b_data, 0, inode->i_sb->s_blocksize);
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set_buffer_uptodate(bh);
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mark_buffer_dirty(bh);
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unlock_buffer(bh);
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if (IS_SYNC(inode) || sync)
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sync_dirty_buffer(bh);
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brelse(bh);
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}
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}
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u64 ufs_new_fragments(struct inode *inode, void *p, u64 fragment,
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u64 goal, unsigned count, int *err,
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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;
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u64 tmp, request, result;
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UFSD("ENTER, ino %lu, fragment %llu, goal %llu, count %u\n",
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inode->i_ino, (unsigned long long)fragment,
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(unsigned long long)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 = ufs_data_ptr_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 %llu, count %u",
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(unsigned long long)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 %llu, tmp %llu\n",
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(unsigned long long)fragment,
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(unsigned long long)tmp);
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unlock_super(sb);
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return INVBLOCK;
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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(uspi, 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(uspi, 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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ufs_cpu_to_data_ptr(sb, p, result);
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*err = 0;
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UFS_I(inode)->i_lastfrag =
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max_t(u32, UFS_I(inode)->i_lastfrag,
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fragment + count);
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ufs_clear_frags(inode, result + oldcount,
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newcount - oldcount, locked_page != NULL);
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}
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unlock_super(sb);
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UFSD("EXIT, result %llu\n", (unsigned long long)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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UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count);
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ufs_clear_frags(inode, result + oldcount, newcount - oldcount,
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locked_page != NULL);
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unlock_super(sb);
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UFSD("EXIT, result %llu\n", (unsigned long long)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 || uspi->cs_total.cs_nffree
|
|
> uspi->s_dsize * uspi->s_minfree / (2 * 100))
|
|
break;
|
|
usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME);
|
|
break;
|
|
default:
|
|
usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME);
|
|
|
|
case UFS_OPTTIME:
|
|
request = uspi->s_fpb;
|
|
if (uspi->cs_total.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_clear_frags(inode, result + oldcount, newcount - oldcount,
|
|
locked_page != NULL);
|
|
ufs_change_blocknr(inode, fragment - oldcount, oldcount,
|
|
uspi->s_sbbase + tmp,
|
|
uspi->s_sbbase + result, locked_page);
|
|
ufs_cpu_to_data_ptr(sb, p, result);
|
|
*err = 0;
|
|
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 %llu\n", (unsigned long long)result);
|
|
return result;
|
|
}
|
|
|
|
unlock_super(sb);
|
|
UFSD("EXIT (FAILED)\n");
|
|
return 0;
|
|
}
|
|
|
|
static u64 ufs_add_fragments(struct inode *inode, u64 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 %llu, oldcount %u, newcount %u\n",
|
|
(unsigned long long)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(uspi, 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(ucpi));
|
|
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(uspi, fragment);
|
|
fragoff = ufs_fragnum (fragno);
|
|
for (i = oldcount; i < newcount; i++)
|
|
if (ubh_isclr (UCPI_UBH(ucpi), 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), 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), ucpi->c_freeoff, fragno + i);
|
|
|
|
fs32_sub(sb, &ucg->cg_cs.cs_nffree, count);
|
|
fs32_sub(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, count);
|
|
uspi->cs_total.cs_nffree -= count;
|
|
|
|
ubh_mark_buffer_dirty (USPI_UBH(uspi));
|
|
ubh_mark_buffer_dirty (UCPI_UBH(ucpi));
|
|
if (sb->s_flags & MS_SYNCHRONOUS)
|
|
ubh_sync_block(UCPI_UBH(ucpi));
|
|
sb->s_dirt = 1;
|
|
|
|
UFSD("EXIT, fragment %llu\n", (unsigned long long)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 u64 ufs_alloc_fragments(struct inode *inode, unsigned cgno,
|
|
u64 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, allocsize;
|
|
u64 result;
|
|
|
|
UFSD("ENTER, ino %lu, cgno %u, goal %llu, count %u\n",
|
|
inode->i_ino, cgno, (unsigned long long)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(ucpi));
|
|
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 == INVBLOCK)
|
|
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 == INVBLOCK)
|
|
return 0;
|
|
goal = ufs_dtogd(uspi, result);
|
|
for (i = count; i < uspi->s_fpb; i++)
|
|
ubh_setbit (UCPI_UBH(ucpi), ucpi->c_freeoff, goal + i);
|
|
i = uspi->s_fpb - count;
|
|
|
|
fs32_add(sb, &ucg->cg_cs.cs_nffree, i);
|
|
uspi->cs_total.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 == INVBLOCK)
|
|
return 0;
|
|
for (i = 0; i < count; i++)
|
|
ubh_clrbit (UCPI_UBH(ucpi), ucpi->c_freeoff, result + i);
|
|
|
|
fs32_sub(sb, &ucg->cg_cs.cs_nffree, count);
|
|
uspi->cs_total.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(uspi));
|
|
ubh_mark_buffer_dirty (UCPI_UBH(ucpi));
|
|
if (sb->s_flags & MS_SYNCHRONOUS)
|
|
ubh_sync_block(UCPI_UBH(ucpi));
|
|
sb->s_dirt = 1;
|
|
|
|
result += cgno * uspi->s_fpg;
|
|
UFSD("EXIT3, result %llu\n", (unsigned long long)result);
|
|
return result;
|
|
}
|
|
|
|
static u64 ufs_alloccg_block(struct inode *inode,
|
|
struct ufs_cg_private_info *ucpi,
|
|
u64 goal, int *err)
|
|
{
|
|
struct super_block * sb;
|
|
struct ufs_sb_private_info * uspi;
|
|
struct ufs_super_block_first * usb1;
|
|
struct ufs_cylinder_group * ucg;
|
|
u64 result, blkno;
|
|
|
|
UFSD("ENTER, goal %llu\n", (unsigned long long)goal);
|
|
|
|
sb = inode->i_sb;
|
|
uspi = UFS_SB(sb)->s_uspi;
|
|
usb1 = ubh_get_usb_first(uspi);
|
|
ucg = ubh_get_ucg(UCPI_UBH(ucpi));
|
|
|
|
if (goal == 0) {
|
|
goal = ucpi->c_rotor;
|
|
goto norot;
|
|
}
|
|
goal = ufs_blknum (goal);
|
|
goal = ufs_dtogd(uspi, goal);
|
|
|
|
/*
|
|
* If the requested block is available, use it.
|
|
*/
|
|
if (ubh_isblockset(UCPI_UBH(ucpi), ucpi->c_freeoff, ufs_fragstoblks(goal))) {
|
|
result = goal;
|
|
goto gotit;
|
|
}
|
|
|
|
norot:
|
|
result = ufs_bitmap_search (sb, ucpi, goal, uspi->s_fpb);
|
|
if (result == INVBLOCK)
|
|
return INVBLOCK;
|
|
ucpi->c_rotor = result;
|
|
gotit:
|
|
blkno = ufs_fragstoblks(result);
|
|
ubh_clrblock (UCPI_UBH(ucpi), ucpi->c_freeoff, blkno);
|
|
if ((UFS_SB(sb)->s_flags & UFS_CG_MASK) == UFS_CG_44BSD)
|
|
ufs_clusteracct (sb, ucpi, blkno, -1);
|
|
|
|
fs32_sub(sb, &ucg->cg_cs.cs_nbfree, 1);
|
|
uspi->cs_total.cs_nbfree--;
|
|
fs32_sub(sb, &UFS_SB(sb)->fs_cs(ucpi->c_cgx).cs_nbfree, 1);
|
|
|
|
if (uspi->fs_magic != UFS2_MAGIC) {
|
|
unsigned cylno = ufs_cbtocylno((unsigned)result);
|
|
|
|
fs16_sub(sb, &ubh_cg_blks(ucpi, cylno,
|
|
ufs_cbtorpos((unsigned)result)), 1);
|
|
fs32_sub(sb, &ubh_cg_blktot(ucpi, cylno), 1);
|
|
}
|
|
|
|
UFSD("EXIT, result %llu\n", (unsigned long long)result);
|
|
|
|
return result;
|
|
}
|
|
|
|
static unsigned ubh_scanc(struct ufs_sb_private_info *uspi,
|
|
struct ufs_buffer_head *ubh,
|
|
unsigned begin, unsigned size,
|
|
unsigned char *table, unsigned char mask)
|
|
{
|
|
unsigned rest, offset;
|
|
unsigned char *cp;
|
|
|
|
|
|
offset = begin & ~uspi->s_fmask;
|
|
begin >>= uspi->s_fshift;
|
|
for (;;) {
|
|
if ((offset + size) < uspi->s_fsize)
|
|
rest = size;
|
|
else
|
|
rest = uspi->s_fsize - offset;
|
|
size -= rest;
|
|
cp = ubh->bh[begin]->b_data + offset;
|
|
while ((table[*cp++] & mask) == 0 && --rest)
|
|
;
|
|
if (rest || !size)
|
|
break;
|
|
begin++;
|
|
offset = 0;
|
|
}
|
|
return (size + rest);
|
|
}
|
|
|
|
/*
|
|
* Find a block of the specified size in the specified cylinder group.
|
|
* @sp: pointer to super block
|
|
* @ucpi: pointer to cylinder group info
|
|
* @goal: near which block we want find new one
|
|
* @count: specified size
|
|
*/
|
|
static u64 ufs_bitmap_search(struct super_block *sb,
|
|
struct ufs_cg_private_info *ucpi,
|
|
u64 goal, unsigned count)
|
|
{
|
|
/*
|
|
* Bit patterns for identifying fragments in the block map
|
|
* used as ((map & mask_arr) == want_arr)
|
|
*/
|
|
static const int mask_arr[9] = {
|
|
0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff
|
|
};
|
|
static const int want_arr[9] = {
|
|
0x0, 0x2, 0x6, 0xe, 0x1e, 0x3e, 0x7e, 0xfe, 0x1fe
|
|
};
|
|
struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
|
|
struct ufs_super_block_first *usb1;
|
|
struct ufs_cylinder_group *ucg;
|
|
unsigned start, length, loc;
|
|
unsigned pos, want, blockmap, mask, end;
|
|
u64 result;
|
|
|
|
UFSD("ENTER, cg %u, goal %llu, count %u\n", ucpi->c_cgx,
|
|
(unsigned long long)goal, count);
|
|
|
|
usb1 = ubh_get_usb_first (uspi);
|
|
ucg = ubh_get_ucg(UCPI_UBH(ucpi));
|
|
|
|
if (goal)
|
|
start = ufs_dtogd(uspi, goal) >> 3;
|
|
else
|
|
start = ucpi->c_frotor >> 3;
|
|
|
|
length = ((uspi->s_fpg + 7) >> 3) - start;
|
|
loc = ubh_scanc(uspi, UCPI_UBH(ucpi), ucpi->c_freeoff + start, length,
|
|
(uspi->s_fpb == 8) ? ufs_fragtable_8fpb : ufs_fragtable_other,
|
|
1 << (count - 1 + (uspi->s_fpb & 7)));
|
|
if (loc == 0) {
|
|
length = start + 1;
|
|
loc = ubh_scanc(uspi, UCPI_UBH(ucpi), ucpi->c_freeoff, length,
|
|
(uspi->s_fpb == 8) ? ufs_fragtable_8fpb :
|
|
ufs_fragtable_other,
|
|
1 << (count - 1 + (uspi->s_fpb & 7)));
|
|
if (loc == 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 INVBLOCK;
|
|
}
|
|
start = 0;
|
|
}
|
|
result = (start + length - loc) << 3;
|
|
ucpi->c_frotor = result;
|
|
|
|
/*
|
|
* found the byte in the map
|
|
*/
|
|
|
|
for (end = result + 8; result < end; result += uspi->s_fpb) {
|
|
blockmap = ubh_blkmap(UCPI_UBH(ucpi), ucpi->c_freeoff, result);
|
|
blockmap <<= 1;
|
|
mask = mask_arr[count];
|
|
want = want_arr[count];
|
|
for (pos = 0; pos <= uspi->s_fpb - count; pos++) {
|
|
if ((blockmap & mask) == want) {
|
|
UFSD("EXIT, result %llu\n",
|
|
(unsigned long long)result);
|
|
return result + pos;
|
|
}
|
|
mask <<= 1;
|
|
want <<= 1;
|
|
}
|
|
}
|
|
|
|
ufs_error(sb, "ufs_bitmap_search", "block not in map on cg %u\n",
|
|
ucpi->c_cgx);
|
|
UFSD("EXIT (FAILED)\n");
|
|
return INVBLOCK;
|
|
}
|
|
|
|
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), ucpi->c_clusteroff, blkno);
|
|
else
|
|
ubh_clrbit(UCPI_UBH(ucpi), 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), 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), 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), ucpi->c_clustersumoff + (i << 2)), cnt);
|
|
if (back > 0)
|
|
fs32_sub(sb, (__fs32*)ubh_get_addr(UCPI_UBH(ucpi), ucpi->c_clustersumoff + (back << 2)), cnt);
|
|
if (forw > 0)
|
|
fs32_sub(sb, (__fs32*)ubh_get_addr(UCPI_UBH(ucpi), 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,
|
|
};
|