523 lines
13 KiB
C
523 lines
13 KiB
C
/*
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* linux/fs/ufs/truncate.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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* from
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*
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* linux/fs/ext2/truncate.c
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/fs/minix/truncate.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* Big-endian to little-endian byte-swapping/bitmaps by
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* David S. Miller (davem@caip.rutgers.edu), 1995
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*/
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/*
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* Real random numbers for secure rm added 94/02/18
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* Idea from Pierre del Perugia <delperug@gla.ecoledoc.ibp.fr>
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*/
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/*
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* Adoptation to use page cache and UFS2 write support by
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* Evgeniy Dushistov <dushistov@mail.ru>, 2006-2007
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*/
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/fcntl.h>
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#include <linux/time.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/buffer_head.h>
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#include <linux/blkdev.h>
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#include <linux/sched.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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/*
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* Secure deletion currently doesn't work. It interacts very badly
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* with buffers shared with memory mappings, and for that reason
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* can't be done in the truncate() routines. It should instead be
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* done separately in "release()" before calling the truncate routines
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* that will release the actual file blocks.
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*
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* Linus
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*/
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#define DIRECT_BLOCK ((inode->i_size + uspi->s_bsize - 1) >> uspi->s_bshift)
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#define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
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static int ufs_trunc_direct(struct inode *inode)
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{
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struct ufs_inode_info *ufsi = UFS_I(inode);
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struct super_block * sb;
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struct ufs_sb_private_info * uspi;
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void *p;
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u64 frag1, frag2, frag3, frag4, block1, block2;
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unsigned frag_to_free, free_count;
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unsigned i, tmp;
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int retry;
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UFSD("ENTER: ino %lu\n", inode->i_ino);
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sb = inode->i_sb;
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uspi = UFS_SB(sb)->s_uspi;
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frag_to_free = 0;
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free_count = 0;
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retry = 0;
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frag1 = DIRECT_FRAGMENT;
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frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
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frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
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frag3 = frag4 & ~uspi->s_fpbmask;
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block1 = block2 = 0;
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if (frag2 > frag3) {
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frag2 = frag4;
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frag3 = frag4 = 0;
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} else if (frag2 < frag3) {
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block1 = ufs_fragstoblks (frag2);
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block2 = ufs_fragstoblks (frag3);
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}
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UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
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" frag3 %llu, frag4 %llu\n", inode->i_ino,
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(unsigned long long)frag1, (unsigned long long)frag2,
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(unsigned long long)block1, (unsigned long long)block2,
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(unsigned long long)frag3, (unsigned long long)frag4);
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if (frag1 >= frag2)
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goto next1;
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/*
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* Free first free fragments
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*/
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p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
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tmp = ufs_data_ptr_to_cpu(sb, p);
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if (!tmp )
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ufs_panic (sb, "ufs_trunc_direct", "internal error");
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frag2 -= frag1;
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frag1 = ufs_fragnum (frag1);
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ufs_free_fragments(inode, tmp + frag1, frag2);
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mark_inode_dirty(inode);
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frag_to_free = tmp + frag1;
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next1:
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/*
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* Free whole blocks
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*/
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for (i = block1 ; i < block2; i++) {
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p = ufs_get_direct_data_ptr(uspi, ufsi, i);
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tmp = ufs_data_ptr_to_cpu(sb, p);
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if (!tmp)
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continue;
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ufs_data_ptr_clear(uspi, p);
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if (free_count == 0) {
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frag_to_free = tmp;
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free_count = uspi->s_fpb;
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} else if (free_count > 0 && frag_to_free == tmp - free_count)
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free_count += uspi->s_fpb;
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else {
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ufs_free_blocks (inode, frag_to_free, free_count);
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frag_to_free = tmp;
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free_count = uspi->s_fpb;
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}
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mark_inode_dirty(inode);
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}
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if (free_count > 0)
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ufs_free_blocks (inode, frag_to_free, free_count);
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if (frag3 >= frag4)
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goto next3;
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/*
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* Free last free fragments
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*/
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p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
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tmp = ufs_data_ptr_to_cpu(sb, p);
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if (!tmp )
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ufs_panic(sb, "ufs_truncate_direct", "internal error");
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frag4 = ufs_fragnum (frag4);
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ufs_data_ptr_clear(uspi, p);
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ufs_free_fragments (inode, tmp, frag4);
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mark_inode_dirty(inode);
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next3:
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UFSD("EXIT: ino %lu\n", inode->i_ino);
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return retry;
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}
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static int ufs_trunc_indirect(struct inode *inode, u64 offset, void *p)
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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_buffer_head * ind_ubh;
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void *ind;
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u64 tmp, indirect_block, i, frag_to_free;
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unsigned free_count;
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int retry;
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UFSD("ENTER: ino %lu, offset %llu, p: %p\n",
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inode->i_ino, (unsigned long long)offset, p);
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BUG_ON(!p);
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sb = inode->i_sb;
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uspi = UFS_SB(sb)->s_uspi;
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frag_to_free = 0;
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free_count = 0;
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retry = 0;
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tmp = ufs_data_ptr_to_cpu(sb, p);
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if (!tmp)
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return 0;
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ind_ubh = ubh_bread(sb, tmp, uspi->s_bsize);
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if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
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ubh_brelse (ind_ubh);
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return 1;
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}
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if (!ind_ubh) {
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ufs_data_ptr_clear(uspi, p);
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return 0;
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}
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indirect_block = (DIRECT_BLOCK > offset) ? (DIRECT_BLOCK - offset) : 0;
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for (i = indirect_block; i < uspi->s_apb; i++) {
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ind = ubh_get_data_ptr(uspi, ind_ubh, i);
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tmp = ufs_data_ptr_to_cpu(sb, ind);
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if (!tmp)
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continue;
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ufs_data_ptr_clear(uspi, ind);
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ubh_mark_buffer_dirty(ind_ubh);
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if (free_count == 0) {
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frag_to_free = tmp;
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free_count = uspi->s_fpb;
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} else if (free_count > 0 && frag_to_free == tmp - free_count)
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free_count += uspi->s_fpb;
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else {
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ufs_free_blocks (inode, frag_to_free, free_count);
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frag_to_free = tmp;
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free_count = uspi->s_fpb;
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}
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mark_inode_dirty(inode);
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}
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if (free_count > 0) {
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ufs_free_blocks (inode, frag_to_free, free_count);
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}
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for (i = 0; i < uspi->s_apb; i++)
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if (!ufs_is_data_ptr_zero(uspi,
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ubh_get_data_ptr(uspi, ind_ubh, i)))
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break;
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if (i >= uspi->s_apb) {
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tmp = ufs_data_ptr_to_cpu(sb, p);
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ufs_data_ptr_clear(uspi, p);
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ufs_free_blocks (inode, tmp, uspi->s_fpb);
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mark_inode_dirty(inode);
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ubh_bforget(ind_ubh);
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ind_ubh = NULL;
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}
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if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh))
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ubh_sync_block(ind_ubh);
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ubh_brelse (ind_ubh);
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UFSD("EXIT: ino %lu\n", inode->i_ino);
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return retry;
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}
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static int ufs_trunc_dindirect(struct inode *inode, u64 offset, void *p)
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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_buffer_head *dind_bh;
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u64 i, tmp, dindirect_block;
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void *dind;
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int retry = 0;
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UFSD("ENTER: ino %lu\n", inode->i_ino);
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sb = inode->i_sb;
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uspi = UFS_SB(sb)->s_uspi;
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dindirect_block = (DIRECT_BLOCK > offset)
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? ((DIRECT_BLOCK - offset) >> uspi->s_apbshift) : 0;
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retry = 0;
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tmp = ufs_data_ptr_to_cpu(sb, p);
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if (!tmp)
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return 0;
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dind_bh = ubh_bread(sb, tmp, uspi->s_bsize);
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if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
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ubh_brelse (dind_bh);
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return 1;
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}
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if (!dind_bh) {
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ufs_data_ptr_clear(uspi, p);
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return 0;
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}
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for (i = dindirect_block ; i < uspi->s_apb ; i++) {
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dind = ubh_get_data_ptr(uspi, dind_bh, i);
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tmp = ufs_data_ptr_to_cpu(sb, dind);
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if (!tmp)
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continue;
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retry |= ufs_trunc_indirect (inode, offset + (i << uspi->s_apbshift), dind);
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ubh_mark_buffer_dirty(dind_bh);
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}
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for (i = 0; i < uspi->s_apb; i++)
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if (!ufs_is_data_ptr_zero(uspi,
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ubh_get_data_ptr(uspi, dind_bh, i)))
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break;
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if (i >= uspi->s_apb) {
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tmp = ufs_data_ptr_to_cpu(sb, p);
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ufs_data_ptr_clear(uspi, p);
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ufs_free_blocks(inode, tmp, uspi->s_fpb);
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mark_inode_dirty(inode);
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ubh_bforget(dind_bh);
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dind_bh = NULL;
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}
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if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh))
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ubh_sync_block(dind_bh);
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ubh_brelse (dind_bh);
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UFSD("EXIT: ino %lu\n", inode->i_ino);
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return retry;
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}
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static int ufs_trunc_tindirect(struct inode *inode)
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{
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struct super_block *sb = inode->i_sb;
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struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
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struct ufs_inode_info *ufsi = UFS_I(inode);
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struct ufs_buffer_head * tind_bh;
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u64 tindirect_block, tmp, i;
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void *tind, *p;
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int retry;
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UFSD("ENTER: ino %lu\n", inode->i_ino);
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retry = 0;
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tindirect_block = (DIRECT_BLOCK > (UFS_NDADDR + uspi->s_apb + uspi->s_2apb))
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? ((DIRECT_BLOCK - UFS_NDADDR - uspi->s_apb - uspi->s_2apb) >> uspi->s_2apbshift) : 0;
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p = ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK);
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if (!(tmp = ufs_data_ptr_to_cpu(sb, p)))
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return 0;
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tind_bh = ubh_bread (sb, tmp, uspi->s_bsize);
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if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
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ubh_brelse (tind_bh);
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return 1;
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}
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if (!tind_bh) {
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ufs_data_ptr_clear(uspi, p);
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return 0;
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}
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for (i = tindirect_block ; i < uspi->s_apb ; i++) {
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tind = ubh_get_data_ptr(uspi, tind_bh, i);
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retry |= ufs_trunc_dindirect(inode, UFS_NDADDR +
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uspi->s_apb + ((i + 1) << uspi->s_2apbshift), tind);
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ubh_mark_buffer_dirty(tind_bh);
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}
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for (i = 0; i < uspi->s_apb; i++)
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if (!ufs_is_data_ptr_zero(uspi,
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ubh_get_data_ptr(uspi, tind_bh, i)))
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break;
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if (i >= uspi->s_apb) {
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tmp = ufs_data_ptr_to_cpu(sb, p);
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ufs_data_ptr_clear(uspi, p);
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ufs_free_blocks(inode, tmp, uspi->s_fpb);
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mark_inode_dirty(inode);
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ubh_bforget(tind_bh);
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tind_bh = NULL;
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}
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if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh))
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ubh_sync_block(tind_bh);
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ubh_brelse (tind_bh);
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UFSD("EXIT: ino %lu\n", inode->i_ino);
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return retry;
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}
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static int ufs_alloc_lastblock(struct inode *inode)
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{
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int err = 0;
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struct super_block *sb = inode->i_sb;
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struct address_space *mapping = inode->i_mapping;
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struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
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unsigned i, end;
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sector_t lastfrag;
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struct page *lastpage;
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struct buffer_head *bh;
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u64 phys64;
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lastfrag = (i_size_read(inode) + uspi->s_fsize - 1) >> uspi->s_fshift;
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if (!lastfrag)
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goto out;
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lastfrag--;
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lastpage = ufs_get_locked_page(mapping, lastfrag >>
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(PAGE_CACHE_SHIFT - inode->i_blkbits));
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if (IS_ERR(lastpage)) {
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err = -EIO;
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goto out;
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}
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end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1);
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bh = page_buffers(lastpage);
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for (i = 0; i < end; ++i)
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bh = bh->b_this_page;
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err = ufs_getfrag_block(inode, lastfrag, bh, 1);
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if (unlikely(err))
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goto out_unlock;
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if (buffer_new(bh)) {
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clear_buffer_new(bh);
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unmap_underlying_metadata(bh->b_bdev,
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bh->b_blocknr);
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/*
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* we do not zeroize fragment, because of
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* if it maped to hole, it already contains zeroes
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*/
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set_buffer_uptodate(bh);
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mark_buffer_dirty(bh);
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set_page_dirty(lastpage);
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}
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if (lastfrag >= UFS_IND_FRAGMENT) {
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end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
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phys64 = bh->b_blocknr + 1;
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for (i = 0; i < end; ++i) {
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bh = sb_getblk(sb, i + phys64);
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lock_buffer(bh);
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memset(bh->b_data, 0, sb->s_blocksize);
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set_buffer_uptodate(bh);
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mark_buffer_dirty(bh);
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unlock_buffer(bh);
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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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out_unlock:
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ufs_put_locked_page(lastpage);
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out:
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return err;
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}
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int ufs_truncate(struct inode *inode, loff_t old_i_size)
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{
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struct ufs_inode_info *ufsi = UFS_I(inode);
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struct super_block *sb = inode->i_sb;
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struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
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int retry, err = 0;
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UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
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inode->i_ino, (unsigned long long)i_size_read(inode),
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(unsigned long long)old_i_size);
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if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
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S_ISLNK(inode->i_mode)))
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return -EINVAL;
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if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
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return -EPERM;
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err = ufs_alloc_lastblock(inode);
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if (err) {
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i_size_write(inode, old_i_size);
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goto out;
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}
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block_truncate_page(inode->i_mapping, inode->i_size, ufs_getfrag_block);
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while (1) {
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retry = ufs_trunc_direct(inode);
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retry |= ufs_trunc_indirect(inode, UFS_IND_BLOCK,
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ufs_get_direct_data_ptr(uspi, ufsi,
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UFS_IND_BLOCK));
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retry |= ufs_trunc_dindirect(inode, UFS_IND_BLOCK + uspi->s_apb,
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ufs_get_direct_data_ptr(uspi, ufsi,
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UFS_DIND_BLOCK));
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retry |= ufs_trunc_tindirect (inode);
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if (!retry)
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break;
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if (IS_SYNC(inode) && (inode->i_state & I_DIRTY))
|
|
ufs_sync_inode (inode);
|
|
yield();
|
|
}
|
|
|
|
inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
|
|
ufsi->i_lastfrag = DIRECT_FRAGMENT;
|
|
mark_inode_dirty(inode);
|
|
out:
|
|
UFSD("EXIT: err %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
int ufs_setattr(struct dentry *dentry, struct iattr *attr)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
unsigned int ia_valid = attr->ia_valid;
|
|
int error;
|
|
|
|
error = inode_change_ok(inode, attr);
|
|
if (error)
|
|
return error;
|
|
|
|
if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
|
|
loff_t old_i_size = inode->i_size;
|
|
|
|
/* XXX(truncate): truncate_setsize should be called last */
|
|
truncate_setsize(inode, attr->ia_size);
|
|
|
|
lock_ufs(inode->i_sb);
|
|
error = ufs_truncate(inode, old_i_size);
|
|
unlock_ufs(inode->i_sb);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
setattr_copy(inode, attr);
|
|
mark_inode_dirty(inode);
|
|
return 0;
|
|
}
|
|
|
|
const struct inode_operations ufs_file_inode_operations = {
|
|
.setattr = ufs_setattr,
|
|
};
|