Release 4.10 fs/ufs/inode.c

/*
 *  linux/fs/ufs/inode.c
 *
 * Copyright (C) 1998
 * Daniel Pirkl <daniel.pirkl@email.cz>
 * Charles University, Faculty of Mathematics and Physics
 *
 *  from
 *
 *  linux/fs/ext2/inode.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/inode.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Goal-directed block allocation by Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
 *  Big-endian to little-endian byte-swapping/bitmaps by
 *        David S. Miller (davem@caip.rutgers.edu), 1995
 */

#include <linux/uaccess.h>

#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/time.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/buffer_head.h>
#include <linux/writeback.h>

#include "ufs_fs.h"
#include "ufs.h"
#include "swab.h"
#include "util.h"



static int ufs_block_to_path(struct inode *inode, sector_t i_block, unsigned offsets[4])
{
	struct ufs_sb_private_info *uspi = UFS_SB(inode->i_sb)->s_uspi;
	int ptrs = uspi->s_apb;
	int ptrs_bits = uspi->s_apbshift;
	const long direct_blocks = UFS_NDADDR,
		indirect_blocks = ptrs,
		double_blocks = (1 << (ptrs_bits * 2));
	int n = 0;


	UFSD("ptrs=uspi->s_apb = %d,double_blocks=%ld \n",ptrs,double_blocks);
	if (i_block < direct_blocks) {
		offsets[n++] = i_block;
	} else if ((i_block -= direct_blocks) < indirect_blocks) {
		offsets[n++] = UFS_IND_BLOCK;
		offsets[n++] = i_block;
	} else if ((i_block -= indirect_blocks) < double_blocks) {
		offsets[n++] = UFS_DIND_BLOCK;
		offsets[n++] = i_block >> ptrs_bits;
		offsets[n++] = i_block & (ptrs - 1);
	} else if (((i_block -= double_blocks) >> (ptrs_bits * 2)) < ptrs) {
		offsets[n++] = UFS_TIND_BLOCK;
		offsets[n++] = i_block >> (ptrs_bits * 2);
		offsets[n++] = (i_block >> ptrs_bits) & (ptrs - 1);
		offsets[n++] = i_block & (ptrs - 1);
	} else {
		ufs_warning(inode->i_sb, "ufs_block_to_path", "block > big");
	}
	return n;
}

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7
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dave jones
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evgeniy dushistov
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typedef struct {
	
void	*p;
	union {
		
__fs32	key32;
		
__fs64	key64;
	};
	
struct buffer_head *bh;
} 
Indirect;



static inline int grow_chain32(struct ufs_inode_info *ufsi,
			       struct buffer_head *bh, __fs32 *v,
			       Indirect *from, Indirect *to)
{
	Indirect *p;
	unsigned seq;
	to->bh = bh;
	do {
		seq = read_seqbegin(&ufsi->meta_lock);
		to->key32 = *(__fs32 *)(to->p = v);
		for (p = from; p <= to && p->key32 == *(__fs32 *)p->p; p++)
			;
	} while (read_seqretry(&ufsi->meta_lock, seq));
	return (p > to);
}

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static inline int grow_chain64(struct ufs_inode_info *ufsi,
			       struct buffer_head *bh, __fs64 *v,
			       Indirect *from, Indirect *to)
{
	Indirect *p;
	unsigned seq;
	to->bh = bh;
	do {
		seq = read_seqbegin(&ufsi->meta_lock);
		to->key64 = *(__fs64 *)(to->p = v);
		for (p = from; p <= to && p->key64 == *(__fs64 *)p->p; p++)
			;
	} while (read_seqretry(&ufsi->meta_lock, seq));
	return (p > to);
}

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/*
 * Returns the location of the fragment from
 * the beginning of the filesystem.
 */



static u64 ufs_frag_map(struct inode *inode, unsigned offsets[4], int depth)
{
	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;
	u64 mask = (u64) uspi->s_apbmask>>uspi->s_fpbshift;
	int shift = uspi->s_apbshift-uspi->s_fpbshift;
	Indirect chain[4], *q = chain;
	unsigned *p;
	unsigned flags = UFS_SB(sb)->s_flags;
	u64 res = 0;

	UFSD(": uspi->s_fpbshift = %d ,uspi->s_apbmask = %x, mask=%llx\n",
		uspi->s_fpbshift, uspi->s_apbmask,
		(unsigned long long)mask);

	if (depth == 0)
		goto no_block;

again:
	p = offsets;

	if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
		goto ufs2;

	if (!grow_chain32(ufsi, NULL, &ufsi->i_u1.i_data[*p++], chain, q))
		goto changed;
	if (!q->key32)
		goto no_block;
	while (--depth) {
		__fs32 *ptr;
		struct buffer_head *bh;
		unsigned n = *p++;

		bh = sb_bread(sb, uspi->s_sbbase +
				  fs32_to_cpu(sb, q->key32) + (n>>shift));
		if (!bh)
			goto no_block;
		ptr = (__fs32 *)bh->b_data + (n & mask);
		if (!grow_chain32(ufsi, bh, ptr, chain, ++q))
			goto changed;
		if (!q->key32)
			goto no_block;
	}
	res = fs32_to_cpu(sb, q->key32);
	goto found;

ufs2:
	if (!grow_chain64(ufsi, NULL, &ufsi->i_u1.u2_i_data[*p++], chain, q))
		goto changed;
	if (!q->key64)
		goto no_block;

	while (--depth) {
		__fs64 *ptr;
		struct buffer_head *bh;
		unsigned n = *p++;

		bh = sb_bread(sb, uspi->s_sbbase +
				  fs64_to_cpu(sb, q->key64) + (n>>shift));
		if (!bh)
			goto no_block;
		ptr = (__fs64 *)bh->b_data + (n & mask);
		if (!grow_chain64(ufsi, bh, ptr, chain, ++q))
			goto changed;
		if (!q->key64)
			goto no_block;
	}
	res = fs64_to_cpu(sb, q->key64);
found:
	res += uspi->s_sbbase;
no_block:
	while (q > chain) {
		brelse(q->bh);
		q--;
	}
	return res;

changed:
	while (q > chain) {
		brelse(q->bh);
		q--;
	}
	goto again;
}

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arnd bergmann
arnd bergmann
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evgeniy dushistov
evgeniy dushistov
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0.58%
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dave jones
dave jones
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adrian bunk
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/*
 * Unpacking tails: we have a file with partial final block and
 * we had been asked to extend it.  If the fragment being written
 * is within the same block, we need to extend the tail just to cover
 * that fragment.  Otherwise the tail is extended to full block.
 *
 * Note that we might need to create a _new_ tail, but that will
 * be handled elsewhere; this is strictly for resizing old
 * ones.
 */

static bool

ufs_extend_tail(struct inode *inode, u64 writes_to,
		  int *err, struct page *locked_page)
{
	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;
	unsigned lastfrag = ufsi->i_lastfrag;	/* it's a short file, so unsigned is enough */
	unsigned block = ufs_fragstoblks(lastfrag);
	unsigned new_size;
	void *p;
	u64 tmp;

	if (writes_to < (lastfrag | uspi->s_fpbmask))
		new_size = (writes_to & uspi->s_fpbmask) + 1;
	else
		new_size = uspi->s_fpb;

	p = ufs_get_direct_data_ptr(uspi, ufsi, block);
	tmp = ufs_new_fragments(inode, p, lastfrag, ufs_data_ptr_to_cpu(sb, p),
				new_size, err, locked_page);
	return tmp != 0;
}

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/**
 * ufs_inode_getfrag() - allocate new fragment(s)
 * @inode: pointer to inode
 * @index: number of block pointer within the inode's array.
 * @new_fragment: number of new allocated fragment(s)
 * @err: we set it if something wrong
 * @new: we set it if we allocate new block
 * @locked_page: for ufs_new_fragments()
 */

static u64

ufs_inode_getfrag(struct inode *inode, unsigned index,
		  sector_t new_fragment, int *err,
		  int *new, struct page *locked_page)
{
	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;
	u64 tmp, goal, lastfrag;
	unsigned nfrags = uspi->s_fpb;
	void *p;

        /* TODO : to be done for write support
        if ( (flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
             goto ufs2;
         */

	p = ufs_get_direct_data_ptr(uspi, ufsi, index);
	tmp = ufs_data_ptr_to_cpu(sb, p);
	if (tmp)
		goto out;

	lastfrag = ufsi->i_lastfrag;

	/* will that be a new tail? */
	if (new_fragment < UFS_NDIR_FRAGMENT && new_fragment >= lastfrag)
		nfrags = (new_fragment & uspi->s_fpbmask) + 1;

	goal = 0;
	if (index) {
		goal = ufs_data_ptr_to_cpu(sb,
				 ufs_get_direct_data_ptr(uspi, ufsi, index - 1));
		if (goal)
			goal += uspi->s_fpb;
	}
	tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment),
				goal, uspi->s_fpb, err, locked_page);

	if (!tmp) {
		*err = -ENOSPC;
		return 0;
	}

	if (new)
		*new = 1;
	inode->i_ctime = current_time(inode);
	if (IS_SYNC(inode))
		ufs_sync_inode (inode);
	mark_inode_dirty(inode);
out:
	return tmp + uspi->s_sbbase;

     /* This part : To be implemented ....
        Required only for writing, not required for READ-ONLY.
ufs2:

        u2_block = ufs_fragstoblks(fragment);
        u2_blockoff = ufs_fragnum(fragment);
        p = ufsi->i_u1.u2_i_data + block;
        goal = 0;

repeat2:
        tmp = fs32_to_cpu(sb, *p);
        lastfrag = ufsi->i_lastfrag;

     */
}

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linus torvalds
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deepa dinamani
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andrew morton
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/**
 * ufs_inode_getblock() - allocate new block
 * @inode: pointer to inode
 * @ind_block: block number of the indirect block
 * @index: number of pointer within the indirect block
 * @new_fragment: number of new allocated fragment
 *  (block will hold this fragment and also uspi->s_fpb-1)
 * @err: see ufs_inode_getfrag()
 * @new: see ufs_inode_getfrag()
 * @locked_page: see ufs_inode_getfrag()
 */

static u64

ufs_inode_getblock(struct inode *inode, u64 ind_block,
		  unsigned index, sector_t new_fragment, int *err,
		  int *new, struct page *locked_page)
{
	struct super_block *sb = inode->i_sb;
	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
	int shift = uspi->s_apbshift - uspi->s_fpbshift;
	u64 tmp = 0, goal;
	struct buffer_head *bh;
	void *p;

	if (!ind_block)
		return 0;

	bh = sb_bread(sb, ind_block + (index >> shift));
	if (unlikely(!bh)) {
		*err = -EIO;
		return 0;
	}

	index &= uspi->s_apbmask >> uspi->s_fpbshift;
	if (uspi->fs_magic == UFS2_MAGIC)
		p = (__fs64 *)bh->b_data + index;
	else
		p = (__fs32 *)bh->b_data + index;

	tmp = ufs_data_ptr_to_cpu(sb, p);
	if (tmp)
		goto out;

	if (index && (uspi->fs_magic == UFS2_MAGIC ?
		      (tmp = fs64_to_cpu(sb, ((__fs64 *)bh->b_data)[index-1])) :
		      (tmp = fs32_to_cpu(sb, ((__fs32 *)bh->b_data)[index-1]))))
		goal = tmp + uspi->s_fpb;
	else
		goal = bh->b_blocknr + uspi->s_fpb;
	tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment), goal,
				uspi->s_fpb, err, locked_page);
	if (!tmp)
		goto out;

	if (new)
		*new = 1;

	mark_buffer_dirty(bh);
	if (IS_SYNC(inode))
		sync_dirty_buffer(bh);
	inode->i_ctime = current_time(inode);
	mark_inode_dirty(inode);
out:
	brelse (bh);
	UFSD("EXIT\n");
	if (tmp)
		tmp += uspi->s_sbbase;
	return tmp;
}

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linus torvalds
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deepa dinamani
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/**
 * ufs_getfrag_block() - `get_block_t' function, interface between UFS and
 * readpage, writepage and so on
 */



static int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buffer_head *bh_result, int create)
{
	struct super_block *sb = inode->i_sb;
	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
	int err = 0, new = 0;
	unsigned offsets[4];
	int depth = ufs_block_to_path(inode, fragment >> uspi->s_fpbshift, offsets);
	u64 phys64 = 0;
	unsigned frag = fragment & uspi->s_fpbmask;

	if (!create) {
		phys64 = ufs_frag_map(inode, offsets, depth);
		goto out;
	}

        /* This code entered only while writing ....? */

	mutex_lock(&UFS_I(inode)->truncate_mutex);

	UFSD("ENTER, ino %lu, fragment %llu\n", inode->i_ino, (unsigned long long)fragment);
	if (unlikely(!depth)) {
		ufs_warning(sb, "ufs_get_block", "block > big");
		err = -EIO;
		goto out;
	}

	if (UFS_I(inode)->i_lastfrag < UFS_NDIR_FRAGMENT) {
		unsigned lastfrag = UFS_I(inode)->i_lastfrag;
		unsigned tailfrags = lastfrag & uspi->s_fpbmask;
		if (tailfrags && fragment >= lastfrag) {
			if (!ufs_extend_tail(inode, fragment,
					     &err, bh_result->b_page))
				goto out;
		}
	}

	if (depth == 1) {
		phys64 = ufs_inode_getfrag(inode, offsets[0], fragment,
					   &err, &new, bh_result->b_page);
	} else {
		int i;
		phys64 = ufs_inode_getfrag(inode, offsets[0], fragment,
					   &err, NULL, NULL);
		for (i = 1; i < depth - 1; i++)
			phys64 = ufs_inode_getblock(inode, phys64, offsets[i],
						fragment, &err, NULL, NULL);
		phys64 = ufs_inode_getblock(inode, phys64, offsets[depth - 1],
					fragment, &err, &new, bh_result->b_page);
	}
out:
	if (phys64) {
		phys64 += frag;
		map_bh(bh_result, sb, phys64);
		if (new)
			set_buffer_new(bh_result);
	}
	mutex_unlock(&UFS_I(inode)->truncate_mutex);
	return err;
}

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3.54%
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8.33%
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andrew morton
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3.04%
3
12.50%
linus torvalds
linus torvalds
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2.28%
2
8.33%
arnd bergmann
arnd bergmann
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1.01%
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dave jones
dave jones
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static int ufs_writepage(struct page *page, struct writeback_control *wbc)
{
	return block_write_full_page(page,ufs_getfrag_block,wbc);
}

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static int ufs_readpage(struct file *file, struct page *page)
{
	return block_read_full_page(page,ufs_getfrag_block);
}

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int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len)
{
	return __block_write_begin(page, pos, len, ufs_getfrag_block);
}

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static void ufs_truncate_blocks(struct inode *);



static void ufs_write_failed(struct address_space *mapping, loff_t to)
{
	struct inode *inode = mapping->host;

	if (to > inode->i_size) {
		truncate_pagecache(inode, inode->i_size);
		ufs_truncate_blocks(inode);
	}
}

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static int ufs_write_begin(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned flags,
			struct page **pagep, void **fsdata)
{
	int ret;

	ret = block_write_begin(mapping, pos, len, flags, pagep,
				ufs_getfrag_block);
	if (unlikely(ret))
		ufs_write_failed(mapping, pos + len);

	return ret;
}

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static int ufs_write_end(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned copied,
			struct page *page, void *fsdata)
{
	int ret;

	ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
	if (ret < len)
		ufs_write_failed(mapping, pos + len);
	return ret;
}

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static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
{
	return generic_block_bmap(mapping,block,ufs_getfrag_block);
}

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const struct address_space_operations ufs_aops = {
	.readpage = ufs_readpage,
	.writepage = ufs_writepage,
	.write_begin = ufs_write_begin,
	.write_end = ufs_write_end,
	.bmap = ufs_bmap
};



static void ufs_set_inode_ops(struct inode *inode)
{
	if (S_ISREG(inode->i_mode)) {
		inode->i_op = &ufs_file_inode_operations;
		inode->i_fop = &ufs_file_operations;
		inode->i_mapping->a_ops = &ufs_aops;
	} else if (S_ISDIR(inode->i_mode)) {
		inode->i_op = &ufs_dir_inode_operations;
		inode->i_fop = &ufs_dir_operations;
		inode->i_mapping->a_ops = &ufs_aops;
	} else if (S_ISLNK(inode->i_mode)) {
		if (!inode->i_blocks) {
			inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
			inode->i_op = &simple_symlink_inode_operations;
		} else {
			inode->i_mapping->a_ops = &ufs_aops;
			inode->i_op = &page_symlink_inode_operations;
			inode_nohighmem(inode);
		}
	} else
		init_special_inode(inode, inode->i_mode,
				   ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
}

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evgeniy dushistov
evgeniy dushistov
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static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
{
	struct ufs_inode_info *ufsi = UFS_I(inode);
	struct super_block *sb = inode->i_sb;
	umode_t mode;

	/*
         * Copy data to the in-core inode.
         */
	inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
	set_nlink(inode, fs16_to_cpu(sb, ufs_inode->ui_nlink));
	if (inode->i_nlink == 0) {
		ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
		return -1;
	}

	/*
         * Linux now has 32-bit uid and gid, so we can support EFT.
         */
	i_uid_write(inode, ufs_get_inode_uid(sb, ufs_inode));
	i_gid_write(inode, ufs_get_inode_gid(sb, ufs_inode));

	inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
	inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
	inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
	inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
	inode->i_mtime.tv_nsec = 0;
	inode->i_atime.tv_nsec = 0;
	inode->i_ctime.tv_nsec = 0;
	inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
	inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
	ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
	ufsi->i_shadow = fs32_to_cpu(sb