Initial import

1 files changed, 523 insertions, 0 deletions

diff --git a/fs/ufs/truncate.c b/fs/ufs/truncate.c
new file mode 100644
index 000000000..21154704c
--- /dev/null
+++ b/fs/ufs/truncate.c
@@ -0,0 +1,523 @@
+/*
+ *  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,
+};