--- /dev/null
+/*
+ * linux/fs/ufs/truncate.c
+ *
+ * Copyright (C) 1998
+ * Daniel Pirkl <daniel.pirkl@email.cz>
+ * Charles University, Faculty of Mathematics and Physics
+ *
+ * from
+ *
+ * linux/fs/ext2/truncate.c
+ *
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ *
+ * from
+ *
+ * linux/fs/minix/truncate.c
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ * Big-endian to little-endian byte-swapping/bitmaps by
+ * David S. Miller (davem@caip.rutgers.edu), 1995
+ */
+
+/*
+ * Real random numbers for secure rm added 94/02/18
+ * Idea from Pierre del Perugia <delperug@gla.ecoledoc.ibp.fr>
+ */
+
+/*
+ * Adoptation to use page cache and UFS2 write support by
+ * Evgeniy Dushistov <dushistov@mail.ru>, 2006-2007
+ */
+
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/fcntl.h>
+#include <linux/time.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/buffer_head.h>
+#include <linux/blkdev.h>
+#include <linux/sched.h>
+
+#include "ufs_fs.h"
+#include "ufs.h"
+#include "swab.h"
+#include "util.h"
+
+/*
+ * Secure deletion currently doesn't work. It interacts very badly
+ * with buffers shared with memory mappings, and for that reason
+ * can't be done in the truncate() routines. It should instead be
+ * done separately in "release()" before calling the truncate routines
+ * that will release the actual file blocks.
+ *
+ * Linus
+ */
+
+#define DIRECT_BLOCK ((inode->i_size + uspi->s_bsize - 1) >> uspi->s_bshift)
+#define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
+
+
+static int ufs_trunc_direct(struct inode *inode)
+{
+ struct ufs_inode_info *ufsi = UFS_I(inode);
+ struct super_block * sb;
+ struct ufs_sb_private_info * uspi;
+ void *p;
+ u64 frag1, frag2, frag3, frag4, block1, block2;
+ unsigned frag_to_free, free_count;
+ unsigned i, tmp;
+ int retry;
+
+ UFSD("ENTER: ino %lu\n", inode->i_ino);
+
+ sb = inode->i_sb;
+ uspi = UFS_SB(sb)->s_uspi;
+
+ frag_to_free = 0;
+ free_count = 0;
+ retry = 0;
+
+ frag1 = DIRECT_FRAGMENT;
+ frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
+ frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
+ frag3 = frag4 & ~uspi->s_fpbmask;
+ block1 = block2 = 0;
+ if (frag2 > frag3) {
+ frag2 = frag4;
+ frag3 = frag4 = 0;
+ } else if (frag2 < frag3) {
+ block1 = ufs_fragstoblks (frag2);
+ block2 = ufs_fragstoblks (frag3);
+ }
+
+ UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
+ " frag3 %llu, frag4 %llu\n", inode->i_ino,
+ (unsigned long long)frag1, (unsigned long long)frag2,
+ (unsigned long long)block1, (unsigned long long)block2,
+ (unsigned long long)frag3, (unsigned long long)frag4);
+
+ if (frag1 >= frag2)
+ goto next1;
+
+ /*
+ * Free first free fragments
+ */
+ p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
+ tmp = ufs_data_ptr_to_cpu(sb, p);
+ if (!tmp )
+ ufs_panic (sb, "ufs_trunc_direct", "internal error");
+ frag2 -= frag1;
+ frag1 = ufs_fragnum (frag1);
+
+ ufs_free_fragments(inode, tmp + frag1, frag2);
+ mark_inode_dirty(inode);
+ frag_to_free = tmp + frag1;
+
+next1:
+ /*
+ * Free whole blocks
+ */
+ for (i = block1 ; i < block2; i++) {
+ p = ufs_get_direct_data_ptr(uspi, ufsi, i);
+ tmp = ufs_data_ptr_to_cpu(sb, p);
+ if (!tmp)
+ continue;
+ ufs_data_ptr_clear(uspi, p);
+
+ if (free_count == 0) {
+ frag_to_free = tmp;
+ free_count = uspi->s_fpb;
+ } else if (free_count > 0 && frag_to_free == tmp - free_count)
+ free_count += uspi->s_fpb;
+ else {
+ ufs_free_blocks (inode, frag_to_free, free_count);
+ frag_to_free = tmp;
+ free_count = uspi->s_fpb;
+ }
+ mark_inode_dirty(inode);
+ }
+
+ if (free_count > 0)
+ ufs_free_blocks (inode, frag_to_free, free_count);
+
+ if (frag3 >= frag4)
+ goto next3;
+
+ /*
+ * Free last free fragments
+ */
+ p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
+ tmp = ufs_data_ptr_to_cpu(sb, p);
+ if (!tmp )
+ ufs_panic(sb, "ufs_truncate_direct", "internal error");
+ frag4 = ufs_fragnum (frag4);
+ ufs_data_ptr_clear(uspi, p);
+
+ ufs_free_fragments (inode, tmp, frag4);
+ mark_inode_dirty(inode);
+ next3:
+
+ UFSD("EXIT: ino %lu\n", inode->i_ino);
+ return retry;
+}
+
+
+static int ufs_trunc_indirect(struct inode *inode, u64 offset, void *p)
+{
+ struct super_block * sb;
+ struct ufs_sb_private_info * uspi;
+ struct ufs_buffer_head * ind_ubh;
+ void *ind;
+ u64 tmp, indirect_block, i, frag_to_free;
+ unsigned free_count;
+ int retry;
+
+ UFSD("ENTER: ino %lu, offset %llu, p: %p\n",
+ inode->i_ino, (unsigned long long)offset, p);
+
+ BUG_ON(!p);
+
+ sb = inode->i_sb;
+ uspi = UFS_SB(sb)->s_uspi;
+
+ frag_to_free = 0;
+ free_count = 0;
+ retry = 0;
+
+ tmp = ufs_data_ptr_to_cpu(sb, p);
+ if (!tmp)
+ return 0;
+ ind_ubh = ubh_bread(sb, tmp, uspi->s_bsize);
+ if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
+ ubh_brelse (ind_ubh);
+ return 1;
+ }
+ if (!ind_ubh) {
+ ufs_data_ptr_clear(uspi, p);
+ return 0;
+ }
+
+ indirect_block = (DIRECT_BLOCK > offset) ? (DIRECT_BLOCK - offset) : 0;
+ for (i = indirect_block; i < uspi->s_apb; i++) {
+ ind = ubh_get_data_ptr(uspi, ind_ubh, i);
+ tmp = ufs_data_ptr_to_cpu(sb, ind);
+ if (!tmp)
+ continue;
+
+ ufs_data_ptr_clear(uspi, ind);
+ ubh_mark_buffer_dirty(ind_ubh);
+ if (free_count == 0) {
+ frag_to_free = tmp;
+ free_count = uspi->s_fpb;
+ } else if (free_count > 0 && frag_to_free == tmp - free_count)
+ free_count += uspi->s_fpb;
+ else {
+ ufs_free_blocks (inode, frag_to_free, free_count);
+ frag_to_free = tmp;
+ free_count = uspi->s_fpb;
+ }
+
+ mark_inode_dirty(inode);
+ }
+
+ if (free_count > 0) {
+ ufs_free_blocks (inode, frag_to_free, free_count);
+ }
+ for (i = 0; i < uspi->s_apb; i++)
+ if (!ufs_is_data_ptr_zero(uspi,
+ ubh_get_data_ptr(uspi, ind_ubh, i)))
+ break;
+ if (i >= uspi->s_apb) {
+ tmp = ufs_data_ptr_to_cpu(sb, p);
+ ufs_data_ptr_clear(uspi, p);
+
+ ufs_free_blocks (inode, tmp, uspi->s_fpb);
+ mark_inode_dirty(inode);
+ ubh_bforget(ind_ubh);
+ ind_ubh = NULL;
+ }
+ if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh))
+ ubh_sync_block(ind_ubh);
+ ubh_brelse (ind_ubh);
+
+ UFSD("EXIT: ino %lu\n", inode->i_ino);
+
+ return retry;
+}
+
+static int ufs_trunc_dindirect(struct inode *inode, u64 offset, void *p)
+{
+ struct super_block * sb;
+ struct ufs_sb_private_info * uspi;
+ struct ufs_buffer_head *dind_bh;
+ u64 i, tmp, dindirect_block;
+ void *dind;
+ int retry = 0;
+
+ UFSD("ENTER: ino %lu\n", inode->i_ino);
+
+ sb = inode->i_sb;
+ uspi = UFS_SB(sb)->s_uspi;
+
+ dindirect_block = (DIRECT_BLOCK > offset)
+ ? ((DIRECT_BLOCK - offset) >> uspi->s_apbshift) : 0;
+ retry = 0;
+
+ tmp = ufs_data_ptr_to_cpu(sb, p);
+ if (!tmp)
+ return 0;
+ dind_bh = ubh_bread(sb, tmp, uspi->s_bsize);
+ if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
+ ubh_brelse (dind_bh);
+ return 1;
+ }
+ if (!dind_bh) {
+ ufs_data_ptr_clear(uspi, p);
+ return 0;
+ }
+
+ for (i = dindirect_block ; i < uspi->s_apb ; i++) {
+ dind = ubh_get_data_ptr(uspi, dind_bh, i);
+ tmp = ufs_data_ptr_to_cpu(sb, dind);
+ if (!tmp)
+ continue;
+ retry |= ufs_trunc_indirect (inode, offset + (i << uspi->s_apbshift), dind);
+ ubh_mark_buffer_dirty(dind_bh);
+ }
+
+ for (i = 0; i < uspi->s_apb; i++)
+ if (!ufs_is_data_ptr_zero(uspi,
+ ubh_get_data_ptr(uspi, dind_bh, i)))
+ break;
+ if (i >= uspi->s_apb) {
+ tmp = ufs_data_ptr_to_cpu(sb, p);
+ ufs_data_ptr_clear(uspi, p);
+
+ ufs_free_blocks(inode, tmp, uspi->s_fpb);
+ mark_inode_dirty(inode);
+ ubh_bforget(dind_bh);
+ dind_bh = NULL;
+ }
+ if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh))
+ ubh_sync_block(dind_bh);
+ ubh_brelse (dind_bh);
+
+ UFSD("EXIT: ino %lu\n", inode->i_ino);
+
+ return retry;
+}
+
+static int ufs_trunc_tindirect(struct inode *inode)
+{
+ struct super_block *sb = inode->i_sb;
+ struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
+ struct ufs_inode_info *ufsi = UFS_I(inode);
+ struct ufs_buffer_head * tind_bh;
+ u64 tindirect_block, tmp, i;
+ void *tind, *p;
+ int retry;
+
+ UFSD("ENTER: ino %lu\n", inode->i_ino);
+
+ retry = 0;
+
+ tindirect_block = (DIRECT_BLOCK > (UFS_NDADDR + uspi->s_apb + uspi->s_2apb))
+ ? ((DIRECT_BLOCK - UFS_NDADDR - uspi->s_apb - uspi->s_2apb) >> uspi->s_2apbshift) : 0;
+
+ p = ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK);
+ if (!(tmp = ufs_data_ptr_to_cpu(sb, p)))
+ return 0;
+ tind_bh = ubh_bread (sb, tmp, uspi->s_bsize);
+ if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
+ ubh_brelse (tind_bh);
+ return 1;
+ }
+ if (!tind_bh) {
+ ufs_data_ptr_clear(uspi, p);
+ return 0;
+ }
+
+ for (i = tindirect_block ; i < uspi->s_apb ; i++) {
+ tind = ubh_get_data_ptr(uspi, tind_bh, i);
+ retry |= ufs_trunc_dindirect(inode, UFS_NDADDR +
+ uspi->s_apb + ((i + 1) << uspi->s_2apbshift), tind);
+ ubh_mark_buffer_dirty(tind_bh);
+ }
+ for (i = 0; i < uspi->s_apb; i++)
+ if (!ufs_is_data_ptr_zero(uspi,
+ ubh_get_data_ptr(uspi, tind_bh, i)))
+ break;
+ if (i >= uspi->s_apb) {
+ tmp = ufs_data_ptr_to_cpu(sb, p);
+ ufs_data_ptr_clear(uspi, p);
+
+ ufs_free_blocks(inode, tmp, uspi->s_fpb);
+ mark_inode_dirty(inode);
+ ubh_bforget(tind_bh);
+ tind_bh = NULL;
+ }
+ if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh))
+ ubh_sync_block(tind_bh);
+ ubh_brelse (tind_bh);
+
+ UFSD("EXIT: ino %lu\n", inode->i_ino);
+ return retry;
+}
+
+static int ufs_alloc_lastblock(struct inode *inode)
+{
+ int err = 0;
+ struct super_block *sb = inode->i_sb;
+ struct address_space *mapping = inode->i_mapping;
+ struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
+ unsigned i, end;
+ sector_t lastfrag;
+ struct page *lastpage;
+ struct buffer_head *bh;
+ u64 phys64;
+
+ lastfrag = (i_size_read(inode) + uspi->s_fsize - 1) >> uspi->s_fshift;
+
+ if (!lastfrag)
+ goto out;
+
+ lastfrag--;
+
+ lastpage = ufs_get_locked_page(mapping, lastfrag >>
+ (PAGE_CACHE_SHIFT - inode->i_blkbits));
+ if (IS_ERR(lastpage)) {
+ err = -EIO;
+ goto out;
+ }
+
+ end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1);
+ bh = page_buffers(lastpage);
+ for (i = 0; i < end; ++i)
+ bh = bh->b_this_page;
+
+
+ err = ufs_getfrag_block(inode, lastfrag, bh, 1);
+
+ if (unlikely(err))
+ goto out_unlock;
+
+ if (buffer_new(bh)) {
+ clear_buffer_new(bh);
+ unmap_underlying_metadata(bh->b_bdev,
+ bh->b_blocknr);
+ /*
+ * we do not zeroize fragment, because of
+ * if it maped to hole, it already contains zeroes
+ */
+ set_buffer_uptodate(bh);
+ mark_buffer_dirty(bh);
+ set_page_dirty(lastpage);
+ }
+
+ if (lastfrag >= UFS_IND_FRAGMENT) {
+ end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
+ phys64 = bh->b_blocknr + 1;
+ for (i = 0; i < end; ++i) {
+ bh = sb_getblk(sb, i + phys64);
+ lock_buffer(bh);
+ memset(bh->b_data, 0, sb->s_blocksize);
+ set_buffer_uptodate(bh);
+ mark_buffer_dirty(bh);
+ unlock_buffer(bh);
+ sync_dirty_buffer(bh);
+ brelse(bh);
+ }
+ }
+out_unlock:
+ ufs_put_locked_page(lastpage);
+out:
+ return err;
+}
+
+int ufs_truncate(struct inode *inode, loff_t old_i_size)
+{
+ struct ufs_inode_info *ufsi = UFS_I(inode);
+ struct super_block *sb = inode->i_sb;
+ struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
+ int retry, err = 0;
+
+ UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
+ inode->i_ino, (unsigned long long)i_size_read(inode),
+ (unsigned long long)old_i_size);
+
+ if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
+ S_ISLNK(inode->i_mode)))
+ return -EINVAL;
+ if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
+ return -EPERM;
+
+ err = ufs_alloc_lastblock(inode);
+
+ if (err) {
+ i_size_write(inode, old_i_size);
+ goto out;
+ }
+
+ block_truncate_page(inode->i_mapping, inode->i_size, ufs_getfrag_block);
+
+ while (1) {
+ retry = ufs_trunc_direct(inode);
+ retry |= ufs_trunc_indirect(inode, UFS_IND_BLOCK,
+ ufs_get_direct_data_ptr(uspi, ufsi,
+ UFS_IND_BLOCK));
+ retry |= ufs_trunc_dindirect(inode, UFS_IND_BLOCK + uspi->s_apb,
+ ufs_get_direct_data_ptr(uspi, ufsi,
+ UFS_DIND_BLOCK));
+ retry |= ufs_trunc_tindirect (inode);
+ if (!retry)
+ break;
+ 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 = d_inode(dentry);
+ 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,
+};
Code Review / kvmfornfv.git / blobdiff