inode.c 91.9 KB
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/*
 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
 */

#include <linux/time.h>
#include <linux/fs.h>
#include <linux/reiserfs_fs.h>
#include <linux/reiserfs_acl.h>
#include <linux/reiserfs_xattr.h>
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#include <linux/exportfs.h>
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#include <linux/smp_lock.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
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#include <linux/slab.h>
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#include <asm/uaccess.h>
#include <asm/unaligned.h>
#include <linux/buffer_head.h>
#include <linux/mpage.h>
#include <linux/writeback.h>
#include <linux/quotaops.h>
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#include <linux/swap.h>
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int reiserfs_commit_write(struct file *f, struct page *page,
			  unsigned from, unsigned to);
int reiserfs_prepare_write(struct file *f, struct page *page,
			   unsigned from, unsigned to);
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void reiserfs_delete_inode(struct inode *inode)
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{
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	/* We need blocks for transaction + (user+group) quota update (possibly delete) */
	int jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 2 +
	    2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb);
	struct reiserfs_transaction_handle th;
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	int depth;
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	int err;
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	if (!is_bad_inode(inode))
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		dquot_initialize(inode);
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	truncate_inode_pages(&inode->i_data, 0);

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	depth = reiserfs_write_lock_once(inode->i_sb);
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	/* The = 0 happens when we abort creating a new inode for some reason like lack of space.. */
	if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) {	/* also handles bad_inode case */
		reiserfs_delete_xattrs(inode);
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		if (journal_begin(&th, inode->i_sb, jbegin_count))
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			goto out;
		reiserfs_update_inode_transaction(inode);
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		reiserfs_discard_prealloc(&th, inode);

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		err = reiserfs_delete_object(&th, inode);
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		/* Do quota update inside a transaction for journaled quotas. We must do that
		 * after delete_object so that quota updates go into the same transaction as
		 * stat data deletion */
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		if (!err) 
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			dquot_free_inode(inode);
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		if (journal_end(&th, inode->i_sb, jbegin_count))
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			goto out;
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		/* check return value from reiserfs_delete_object after
		 * ending the transaction
		 */
		if (err)
		    goto out;

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		/* all items of file are deleted, so we can remove "save" link */
		remove_save_link(inode, 0 /* not truncate */ );	/* we can't do anything
								 * about an error here */
	} else {
		/* no object items are in the tree */
		;
	}
      out:
	clear_inode(inode);	/* note this must go after the journal_end to prevent deadlock */
	inode->i_blocks = 0;
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	reiserfs_write_unlock_once(inode->i_sb, depth);
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}

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static void _make_cpu_key(struct cpu_key *key, int version, __u32 dirid,
			  __u32 objectid, loff_t offset, int type, int length)
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{
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	key->version = version;
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	key->on_disk_key.k_dir_id = dirid;
	key->on_disk_key.k_objectid = objectid;
	set_cpu_key_k_offset(key, offset);
	set_cpu_key_k_type(key, type);
	key->key_length = length;
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}

/* take base of inode_key (it comes from inode always) (dirid, objectid) and version from an inode, set
   offset and type of key */
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void make_cpu_key(struct cpu_key *key, struct inode *inode, loff_t offset,
		  int type, int length)
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{
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	_make_cpu_key(key, get_inode_item_key_version(inode),
		      le32_to_cpu(INODE_PKEY(inode)->k_dir_id),
		      le32_to_cpu(INODE_PKEY(inode)->k_objectid), offset, type,
		      length);
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}

//
// when key is 0, do not set version and short key
//
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inline void make_le_item_head(struct item_head *ih, const struct cpu_key *key,
			      int version,
			      loff_t offset, int type, int length,
			      int entry_count /*or ih_free_space */ )
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{
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	if (key) {
		ih->ih_key.k_dir_id = cpu_to_le32(key->on_disk_key.k_dir_id);
		ih->ih_key.k_objectid =
		    cpu_to_le32(key->on_disk_key.k_objectid);
	}
	put_ih_version(ih, version);
	set_le_ih_k_offset(ih, offset);
	set_le_ih_k_type(ih, type);
	put_ih_item_len(ih, length);
	/*    set_ih_free_space (ih, 0); */
	// for directory items it is entry count, for directs and stat
	// datas - 0xffff, for indirects - 0
	put_ih_entry_count(ih, entry_count);
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}

//
// FIXME: we might cache recently accessed indirect item

// Ugh.  Not too eager for that....
//  I cut the code until such time as I see a convincing argument (benchmark).
// I don't want a bloated inode struct..., and I don't like code complexity....

/* cutting the code is fine, since it really isn't in use yet and is easy
** to add back in.  But, Vladimir has a really good idea here.  Think
** about what happens for reading a file.  For each page,
** The VFS layer calls reiserfs_readpage, who searches the tree to find
** an indirect item.  This indirect item has X number of pointers, where
** X is a big number if we've done the block allocation right.  But,
** we only use one or two of these pointers during each call to readpage,
** needlessly researching again later on.
**
** The size of the cache could be dynamic based on the size of the file.
**
** I'd also like to see us cache the location the stat data item, since
** we are needlessly researching for that frequently.
**
** --chris
*/

/* If this page has a file tail in it, and
** it was read in by get_block_create_0, the page data is valid,
** but tail is still sitting in a direct item, and we can't write to
** it.  So, look through this page, and check all the mapped buffers
** to make sure they have valid block numbers.  Any that don't need
** to be unmapped, so that block_prepare_write will correctly call
** reiserfs_get_block to convert the tail into an unformatted node
*/
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static inline void fix_tail_page_for_writing(struct page *page)
{
	struct buffer_head *head, *next, *bh;

	if (page && page_has_buffers(page)) {
		head = page_buffers(page);
		bh = head;
		do {
			next = bh->b_this_page;
			if (buffer_mapped(bh) && bh->b_blocknr == 0) {
				reiserfs_unmap_buffer(bh);
			}
			bh = next;
		} while (bh != head);
	}
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}

/* reiserfs_get_block does not need to allocate a block only if it has been
   done already or non-hole position has been found in the indirect item */
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static inline int allocation_needed(int retval, b_blocknr_t allocated,
				    struct item_head *ih,
				    __le32 * item, int pos_in_item)
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{
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	if (allocated)
		return 0;
	if (retval == POSITION_FOUND && is_indirect_le_ih(ih) &&
	    get_block_num(item, pos_in_item))
		return 0;
	return 1;
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}

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static inline int indirect_item_found(int retval, struct item_head *ih)
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{
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	return (retval == POSITION_FOUND) && is_indirect_le_ih(ih);
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}

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static inline void set_block_dev_mapped(struct buffer_head *bh,
					b_blocknr_t block, struct inode *inode)
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{
	map_bh(bh, inode->i_sb, block);
}

//
// files which were created in the earlier version can not be longer,
// than 2 gb
//
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static int file_capable(struct inode *inode, sector_t block)
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{
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	if (get_inode_item_key_version(inode) != KEY_FORMAT_3_5 ||	// it is new file.
	    block < (1 << (31 - inode->i_sb->s_blocksize_bits)))	// old file, but 'block' is inside of 2gb
		return 1;
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	return 0;
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}

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static int restart_transaction(struct reiserfs_transaction_handle *th,
			       struct inode *inode, struct treepath *path)
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{
	struct super_block *s = th->t_super;
	int len = th->t_blocks_allocated;
	int err;

	BUG_ON(!th->t_trans_id);
	BUG_ON(!th->t_refcount);

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	pathrelse(path);

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	/* we cannot restart while nested */
	if (th->t_refcount > 1) {
		return 0;
	}
	reiserfs_update_sd(th, inode);
	err = journal_end(th, s, len);
	if (!err) {
		err = journal_begin(th, s, JOURNAL_PER_BALANCE_CNT * 6);
		if (!err)
			reiserfs_update_inode_transaction(inode);
	}
	return err;
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}

// it is called by get_block when create == 0. Returns block number
// for 'block'-th logical block of file. When it hits direct item it
// returns 0 (being called from bmap) or read direct item into piece
// of page (bh_result)

// Please improve the english/clarity in the comment above, as it is
// hard to understand.

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static int _get_block_create_0(struct inode *inode, sector_t block,
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			       struct buffer_head *bh_result, int args)
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{
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	INITIALIZE_PATH(path);
	struct cpu_key key;
	struct buffer_head *bh;
	struct item_head *ih, tmp_ih;
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	b_blocknr_t blocknr;
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	char *p = NULL;
	int chars;
	int ret;
	int result;
	int done = 0;
	unsigned long offset;

	// prepare the key to look for the 'block'-th block of file
	make_cpu_key(&key, inode,
		     (loff_t) block * inode->i_sb->s_blocksize + 1, TYPE_ANY,
		     3);

	result = search_for_position_by_key(inode->i_sb, &key, &path);
	if (result != POSITION_FOUND) {
		pathrelse(&path);
		if (p)
			kunmap(bh_result->b_page);
		if (result == IO_ERROR)
			return -EIO;
		// We do not return -ENOENT if there is a hole but page is uptodate, because it means
		// That there is some MMAPED data associated with it that is yet to be written to disk.
		if ((args & GET_BLOCK_NO_HOLE)
		    && !PageUptodate(bh_result->b_page)) {
			return -ENOENT;
		}
		return 0;
	}
	//
	bh = get_last_bh(&path);
	ih = get_ih(&path);
	if (is_indirect_le_ih(ih)) {
		__le32 *ind_item = (__le32 *) B_I_PITEM(bh, ih);

		/* FIXME: here we could cache indirect item or part of it in
		   the inode to avoid search_by_key in case of subsequent
		   access to file */
		blocknr = get_block_num(ind_item, path.pos_in_item);
		ret = 0;
		if (blocknr) {
			map_bh(bh_result, inode->i_sb, blocknr);
			if (path.pos_in_item ==
			    ((ih_item_len(ih) / UNFM_P_SIZE) - 1)) {
				set_buffer_boundary(bh_result);
			}
		} else
			// We do not return -ENOENT if there is a hole but page is uptodate, because it means
			// That there is some MMAPED data associated with it that is yet to  be written to disk.
		if ((args & GET_BLOCK_NO_HOLE)
			    && !PageUptodate(bh_result->b_page)) {
			ret = -ENOENT;
		}

		pathrelse(&path);
		if (p)
			kunmap(bh_result->b_page);
		return ret;
	}
	// requested data are in direct item(s)
	if (!(args & GET_BLOCK_READ_DIRECT)) {
		// we are called by bmap. FIXME: we can not map block of file
		// when it is stored in direct item(s)
		pathrelse(&path);
		if (p)
			kunmap(bh_result->b_page);
		return -ENOENT;
	}

	/* if we've got a direct item, and the buffer or page was uptodate,
	 ** we don't want to pull data off disk again.  skip to the
	 ** end, where we map the buffer and return
	 */
	if (buffer_uptodate(bh_result)) {
		goto finished;
	} else
		/*
		 ** grab_tail_page can trigger calls to reiserfs_get_block on up to date
		 ** pages without any buffers.  If the page is up to date, we don't want
		 ** read old data off disk.  Set the up to date bit on the buffer instead
		 ** and jump to the end
		 */
	if (!bh_result->b_page || PageUptodate(bh_result->b_page)) {
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		set_buffer_uptodate(bh_result);
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		goto finished;
	}
	// read file tail into part of page
	offset = (cpu_key_k_offset(&key) - 1) & (PAGE_CACHE_SIZE - 1);
	copy_item_head(&tmp_ih, ih);

	/* we only want to kmap if we are reading the tail into the page.
	 ** this is not the common case, so we don't kmap until we are
	 ** sure we need to.  But, this means the item might move if
	 ** kmap schedules
	 */
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	if (!p)
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		p = (char *)kmap(bh_result->b_page);
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	p += offset;
	memset(p, 0, inode->i_sb->s_blocksize);
	do {
		if (!is_direct_le_ih(ih)) {
			BUG();
		}
		/* make sure we don't read more bytes than actually exist in
		 ** the file.  This can happen in odd cases where i_size isn't
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		 ** correct, and when direct item padding results in a few
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		 ** extra bytes at the end of the direct item
		 */
		if ((le_ih_k_offset(ih) + path.pos_in_item) > inode->i_size)
			break;
		if ((le_ih_k_offset(ih) - 1 + ih_item_len(ih)) > inode->i_size) {
			chars =
			    inode->i_size - (le_ih_k_offset(ih) - 1) -
			    path.pos_in_item;
			done = 1;
		} else {
			chars = ih_item_len(ih) - path.pos_in_item;
		}
		memcpy(p, B_I_PITEM(bh, ih) + path.pos_in_item, chars);

		if (done)
			break;

		p += chars;

		if (PATH_LAST_POSITION(&path) != (B_NR_ITEMS(bh) - 1))
			// we done, if read direct item is not the last item of
			// node FIXME: we could try to check right delimiting key
			// to see whether direct item continues in the right
			// neighbor or rely on i_size
			break;

		// update key to look for the next piece
		set_cpu_key_k_offset(&key, cpu_key_k_offset(&key) + chars);
		result = search_for_position_by_key(inode->i_sb, &key, &path);
		if (result != POSITION_FOUND)
			// i/o error most likely
			break;
		bh = get_last_bh(&path);
		ih = get_ih(&path);
	} while (1);

	flush_dcache_page(bh_result->b_page);
	kunmap(bh_result->b_page);

      finished:
	pathrelse(&path);

	if (result == IO_ERROR)
		return -EIO;
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	/* this buffer has valid data, but isn't valid for io.  mapping it to
	 * block #0 tells the rest of reiserfs it just has a tail in it
	 */
	map_bh(bh_result, inode->i_sb, 0);
	set_buffer_uptodate(bh_result);
	return 0;
}
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// this is called to create file map. So, _get_block_create_0 will not
// read direct item
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static int reiserfs_bmap(struct inode *inode, sector_t block,
			 struct buffer_head *bh_result, int create)
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{
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	if (!file_capable(inode, block))
		return -EFBIG;

	reiserfs_write_lock(inode->i_sb);
	/* do not read the direct item */
	_get_block_create_0(inode, block, bh_result, 0);
	reiserfs_write_unlock(inode->i_sb);
	return 0;
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}

/* special version of get_block that is only used by grab_tail_page right
** now.  It is sent to block_prepare_write, and when you try to get a
** block past the end of the file (or a block from a hole) it returns
** -ENOENT instead of a valid buffer.  block_prepare_write expects to
** be able to do i/o on the buffers returned, unless an error value
** is also returned.
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**
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** So, this allows block_prepare_write to be used for reading a single block
** in a page.  Where it does not produce a valid page for holes, or past the
** end of the file.  This turns out to be exactly what we need for reading
** tails for conversion.
**
** The point of the wrapper is forcing a certain value for create, even
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** though the VFS layer is calling this function with create==1.  If you
** don't want to send create == GET_BLOCK_NO_HOLE to reiserfs_get_block,
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** don't use this function.
*/
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static int reiserfs_get_block_create_0(struct inode *inode, sector_t block,
				       struct buffer_head *bh_result,
				       int create)
{
	return reiserfs_get_block(inode, block, bh_result, GET_BLOCK_NO_HOLE);
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}

/* This is special helper for reiserfs_get_block in case we are executing
   direct_IO request. */
static int reiserfs_get_blocks_direct_io(struct inode *inode,
					 sector_t iblock,
					 struct buffer_head *bh_result,
					 int create)
{
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	int ret;

	bh_result->b_page = NULL;
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	/* We set the b_size before reiserfs_get_block call since it is
	   referenced in convert_tail_for_hole() that may be called from
	   reiserfs_get_block() */
	bh_result->b_size = (1 << inode->i_blkbits);

	ret = reiserfs_get_block(inode, iblock, bh_result,
				 create | GET_BLOCK_NO_DANGLE);
	if (ret)
		goto out;

	/* don't allow direct io onto tail pages */
	if (buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
		/* make sure future calls to the direct io funcs for this offset
		 ** in the file fail by unmapping the buffer
		 */
		clear_buffer_mapped(bh_result);
		ret = -EINVAL;
	}
	/* Possible unpacked tail. Flush the data before pages have
	   disappeared */
	if (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) {
		int err;
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		reiserfs_write_lock(inode->i_sb);

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		err = reiserfs_commit_for_inode(inode);
		REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
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		reiserfs_write_unlock(inode->i_sb);

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		if (err < 0)
			ret = err;
	}
      out:
	return ret;
}
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/*
** helper function for when reiserfs_get_block is called for a hole
** but the file tail is still in a direct item
** bh_result is the buffer head for the hole
** tail_offset is the offset of the start of the tail in the file
**
** This calls prepare_write, which will start a new transaction
** you should not be in a transaction, or have any paths held when you
** call this.
*/
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static int convert_tail_for_hole(struct inode *inode,
				 struct buffer_head *bh_result,
				 loff_t tail_offset)
{
	unsigned long index;
	unsigned long tail_end;
	unsigned long tail_start;
	struct page *tail_page;
	struct page *hole_page = bh_result->b_page;
	int retval = 0;

	if ((tail_offset & (bh_result->b_size - 1)) != 1)
		return -EIO;

	/* always try to read until the end of the block */
	tail_start = tail_offset & (PAGE_CACHE_SIZE - 1);
	tail_end = (tail_start | (bh_result->b_size - 1)) + 1;

	index = tail_offset >> PAGE_CACHE_SHIFT;
	/* hole_page can be zero in case of direct_io, we are sure
	   that we cannot get here if we write with O_DIRECT into
	   tail page */
	if (!hole_page || index != hole_page->index) {
		tail_page = grab_cache_page(inode->i_mapping, index);
		retval = -ENOMEM;
		if (!tail_page) {
			goto out;
		}
	} else {
		tail_page = hole_page;
	}

	/* we don't have to make sure the conversion did not happen while
	 ** we were locking the page because anyone that could convert
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	 ** must first take i_mutex.
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	 **
	 ** We must fix the tail page for writing because it might have buffers
	 ** that are mapped, but have a block number of 0.  This indicates tail
	 ** data that has been read directly into the page, and block_prepare_write
	 ** won't trigger a get_block in this case.
	 */
	fix_tail_page_for_writing(tail_page);
	retval = reiserfs_prepare_write(NULL, tail_page, tail_start, tail_end);
	if (retval)
		goto unlock;

	/* tail conversion might change the data in the page */
	flush_dcache_page(tail_page);

	retval = reiserfs_commit_write(NULL, tail_page, tail_start, tail_end);

      unlock:
	if (tail_page != hole_page) {
		unlock_page(tail_page);
		page_cache_release(tail_page);
	}
      out:
	return retval;
L
Linus Torvalds 已提交
573 574 575
}

static inline int _allocate_block(struct reiserfs_transaction_handle *th,
576
				  sector_t block,
577 578
				  struct inode *inode,
				  b_blocknr_t * allocated_block_nr,
579
				  struct treepath *path, int flags)
580 581 582
{
	BUG_ON(!th->t_trans_id);

L
Linus Torvalds 已提交
583
#ifdef REISERFS_PREALLOCATE
584
	if (!(flags & GET_BLOCK_NO_IMUX)) {
585 586 587
		return reiserfs_new_unf_blocknrs2(th, inode, allocated_block_nr,
						  path, block);
	}
L
Linus Torvalds 已提交
588
#endif
589 590
	return reiserfs_new_unf_blocknrs(th, inode, allocated_block_nr, path,
					 block);
L
Linus Torvalds 已提交
591 592
}

593 594
int reiserfs_get_block(struct inode *inode, sector_t block,
		       struct buffer_head *bh_result, int create)
L
Linus Torvalds 已提交
595
{
596 597 598 599 600 601 602 603 604 605
	int repeat, retval = 0;
	b_blocknr_t allocated_block_nr = 0;	// b_blocknr_t is (unsigned) 32 bit int
	INITIALIZE_PATH(path);
	int pos_in_item;
	struct cpu_key key;
	struct buffer_head *bh, *unbh = NULL;
	struct item_head *ih, tmp_ih;
	__le32 *item;
	int done;
	int fs_gen;
606
	int lock_depth;
607
	struct reiserfs_transaction_handle *th = NULL;
608
	/* space reserved in transaction batch:
609 610 611 612 613 614 615 616 617 618 619 620 621
	   . 3 balancings in direct->indirect conversion
	   . 1 block involved into reiserfs_update_sd()
	   XXX in practically impossible worst case direct2indirect()
	   can incur (much) more than 3 balancings.
	   quota update for user, group */
	int jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 3 + 1 +
	    2 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb);
	int version;
	int dangle = 1;
	loff_t new_offset =
	    (((loff_t) block) << inode->i_sb->s_blocksize_bits) + 1;

622
	lock_depth = reiserfs_write_lock_once(inode->i_sb);
623
	version = get_inode_item_key_version(inode);
L
Linus Torvalds 已提交
624

625
	if (!file_capable(inode, block)) {
626
		reiserfs_write_unlock_once(inode->i_sb, lock_depth);
627 628 629 630 631 632 633 634 635 636 637
		return -EFBIG;
	}

	/* if !create, we aren't changing the FS, so we don't need to
	 ** log anything, so we don't need to start a transaction
	 */
	if (!(create & GET_BLOCK_CREATE)) {
		int ret;
		/* find number of block-th logical block of the file */
		ret = _get_block_create_0(inode, block, bh_result,
					  create | GET_BLOCK_READ_DIRECT);
638
		reiserfs_write_unlock_once(inode->i_sb, lock_depth);
639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664
		return ret;
	}
	/*
	 * if we're already in a transaction, make sure to close
	 * any new transactions we start in this func
	 */
	if ((create & GET_BLOCK_NO_DANGLE) ||
	    reiserfs_transaction_running(inode->i_sb))
		dangle = 0;

	/* If file is of such a size, that it might have a tail and tails are enabled
	 ** we should mark it as possibly needing tail packing on close
	 */
	if ((have_large_tails(inode->i_sb)
	     && inode->i_size < i_block_size(inode) * 4)
	    || (have_small_tails(inode->i_sb)
		&& inode->i_size < i_block_size(inode)))
		REISERFS_I(inode)->i_flags |= i_pack_on_close_mask;

	/* set the key of the first byte in the 'block'-th block of file */
	make_cpu_key(&key, inode, new_offset, TYPE_ANY, 3 /*key length */ );
	if ((new_offset + inode->i_sb->s_blocksize - 1) > inode->i_size) {
	      start_trans:
		th = reiserfs_persistent_transaction(inode->i_sb, jbegin_count);
		if (!th) {
			retval = -ENOMEM;
L
Linus Torvalds 已提交
665 666
			goto failure;
		}
667 668 669
		reiserfs_update_inode_transaction(inode);
	}
      research:
L
Linus Torvalds 已提交
670

671
	retval = search_for_position_by_key(inode->i_sb, &key, &path);
L
Linus Torvalds 已提交
672
	if (retval == IO_ERROR) {
673 674 675 676 677 678 679
		retval = -EIO;
		goto failure;
	}

	bh = get_last_bh(&path);
	ih = get_ih(&path);
	item = get_item(&path);
L
Linus Torvalds 已提交
680 681
	pos_in_item = path.pos_in_item;

682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755
	fs_gen = get_generation(inode->i_sb);
	copy_item_head(&tmp_ih, ih);

	if (allocation_needed
	    (retval, allocated_block_nr, ih, item, pos_in_item)) {
		/* we have to allocate block for the unformatted node */
		if (!th) {
			pathrelse(&path);
			goto start_trans;
		}

		repeat =
		    _allocate_block(th, block, inode, &allocated_block_nr,
				    &path, create);

		if (repeat == NO_DISK_SPACE || repeat == QUOTA_EXCEEDED) {
			/* restart the transaction to give the journal a chance to free
			 ** some blocks.  releases the path, so we have to go back to
			 ** research if we succeed on the second try
			 */
			SB_JOURNAL(inode->i_sb)->j_next_async_flush = 1;
			retval = restart_transaction(th, inode, &path);
			if (retval)
				goto failure;
			repeat =
			    _allocate_block(th, block, inode,
					    &allocated_block_nr, NULL, create);

			if (repeat != NO_DISK_SPACE && repeat != QUOTA_EXCEEDED) {
				goto research;
			}
			if (repeat == QUOTA_EXCEEDED)
				retval = -EDQUOT;
			else
				retval = -ENOSPC;
			goto failure;
		}

		if (fs_changed(fs_gen, inode->i_sb)
		    && item_moved(&tmp_ih, &path)) {
			goto research;
		}
	}

	if (indirect_item_found(retval, ih)) {
		b_blocknr_t unfm_ptr;
		/* 'block'-th block is in the file already (there is
		   corresponding cell in some indirect item). But it may be
		   zero unformatted node pointer (hole) */
		unfm_ptr = get_block_num(item, pos_in_item);
		if (unfm_ptr == 0) {
			/* use allocated block to plug the hole */
			reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
			if (fs_changed(fs_gen, inode->i_sb)
			    && item_moved(&tmp_ih, &path)) {
				reiserfs_restore_prepared_buffer(inode->i_sb,
								 bh);
				goto research;
			}
			set_buffer_new(bh_result);
			if (buffer_dirty(bh_result)
			    && reiserfs_data_ordered(inode->i_sb))
				reiserfs_add_ordered_list(inode, bh_result);
			put_block_num(item, pos_in_item, allocated_block_nr);
			unfm_ptr = allocated_block_nr;
			journal_mark_dirty(th, inode->i_sb, bh);
			reiserfs_update_sd(th, inode);
		}
		set_block_dev_mapped(bh_result, unfm_ptr, inode);
		pathrelse(&path);
		retval = 0;
		if (!dangle && th)
			retval = reiserfs_end_persistent_transaction(th);

756
		reiserfs_write_unlock_once(inode->i_sb, lock_depth);
757 758

		/* the item was found, so new blocks were not added to the file
759
		 ** there is no need to make sure the inode is updated with this
760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845
		 ** transaction
		 */
		return retval;
	}

	if (!th) {
		pathrelse(&path);
		goto start_trans;
	}

	/* desired position is not found or is in the direct item. We have
	   to append file with holes up to 'block'-th block converting
	   direct items to indirect one if necessary */
	done = 0;
	do {
		if (is_statdata_le_ih(ih)) {
			__le32 unp = 0;
			struct cpu_key tmp_key;

			/* indirect item has to be inserted */
			make_le_item_head(&tmp_ih, &key, version, 1,
					  TYPE_INDIRECT, UNFM_P_SIZE,
					  0 /* free_space */ );

			if (cpu_key_k_offset(&key) == 1) {
				/* we are going to add 'block'-th block to the file. Use
				   allocated block for that */
				unp = cpu_to_le32(allocated_block_nr);
				set_block_dev_mapped(bh_result,
						     allocated_block_nr, inode);
				set_buffer_new(bh_result);
				done = 1;
			}
			tmp_key = key;	// ;)
			set_cpu_key_k_offset(&tmp_key, 1);
			PATH_LAST_POSITION(&path)++;

			retval =
			    reiserfs_insert_item(th, &path, &tmp_key, &tmp_ih,
						 inode, (char *)&unp);
			if (retval) {
				reiserfs_free_block(th, inode,
						    allocated_block_nr, 1);
				goto failure;	// retval == -ENOSPC, -EDQUOT or -EIO or -EEXIST
			}
			//mark_tail_converted (inode);
		} else if (is_direct_le_ih(ih)) {
			/* direct item has to be converted */
			loff_t tail_offset;

			tail_offset =
			    ((le_ih_k_offset(ih) -
			      1) & ~(inode->i_sb->s_blocksize - 1)) + 1;
			if (tail_offset == cpu_key_k_offset(&key)) {
				/* direct item we just found fits into block we have
				   to map. Convert it into unformatted node: use
				   bh_result for the conversion */
				set_block_dev_mapped(bh_result,
						     allocated_block_nr, inode);
				unbh = bh_result;
				done = 1;
			} else {
				/* we have to padd file tail stored in direct item(s)
				   up to block size and convert it to unformatted
				   node. FIXME: this should also get into page cache */

				pathrelse(&path);
				/*
				 * ugly, but we can only end the transaction if
				 * we aren't nested
				 */
				BUG_ON(!th->t_refcount);
				if (th->t_refcount == 1) {
					retval =
					    reiserfs_end_persistent_transaction
					    (th);
					th = NULL;
					if (retval)
						goto failure;
				}

				retval =
				    convert_tail_for_hole(inode, bh_result,
							  tail_offset);
				if (retval) {
					if (retval != -ENOSPC)
J
Jeff Mahoney 已提交
846 847 848 849 850 851
						reiserfs_error(inode->i_sb,
							"clm-6004",
							"convert tail failed "
							"inode %lu, error %d",
							inode->i_ino,
							retval);
852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928
					if (allocated_block_nr) {
						/* the bitmap, the super, and the stat data == 3 */
						if (!th)
							th = reiserfs_persistent_transaction(inode->i_sb, 3);
						if (th)
							reiserfs_free_block(th,
									    inode,
									    allocated_block_nr,
									    1);
					}
					goto failure;
				}
				goto research;
			}
			retval =
			    direct2indirect(th, inode, &path, unbh,
					    tail_offset);
			if (retval) {
				reiserfs_unmap_buffer(unbh);
				reiserfs_free_block(th, inode,
						    allocated_block_nr, 1);
				goto failure;
			}
			/* it is important the set_buffer_uptodate is done after
			 ** the direct2indirect.  The buffer might contain valid
			 ** data newer than the data on disk (read by readpage, changed,
			 ** and then sent here by writepage).  direct2indirect needs
			 ** to know if unbh was already up to date, so it can decide
			 ** if the data in unbh needs to be replaced with data from
			 ** the disk
			 */
			set_buffer_uptodate(unbh);

			/* unbh->b_page == NULL in case of DIRECT_IO request, this means
			   buffer will disappear shortly, so it should not be added to
			 */
			if (unbh->b_page) {
				/* we've converted the tail, so we must
				 ** flush unbh before the transaction commits
				 */
				reiserfs_add_tail_list(inode, unbh);

				/* mark it dirty now to prevent commit_write from adding
				 ** this buffer to the inode's dirty buffer list
				 */
				/*
				 * AKPM: changed __mark_buffer_dirty to mark_buffer_dirty().
				 * It's still atomic, but it sets the page dirty too,
				 * which makes it eligible for writeback at any time by the
				 * VM (which was also the case with __mark_buffer_dirty())
				 */
				mark_buffer_dirty(unbh);
			}
		} else {
			/* append indirect item with holes if needed, when appending
			   pointer to 'block'-th block use block, which is already
			   allocated */
			struct cpu_key tmp_key;
			unp_t unf_single = 0;	// We use this in case we need to allocate only
			// one block which is a fastpath
			unp_t *un;
			__u64 max_to_insert =
			    MAX_ITEM_LEN(inode->i_sb->s_blocksize) /
			    UNFM_P_SIZE;
			__u64 blocks_needed;

			RFALSE(pos_in_item != ih_item_len(ih) / UNFM_P_SIZE,
			       "vs-804: invalid position for append");
			/* indirect item has to be appended, set up key of that position */
			make_cpu_key(&tmp_key, inode,
				     le_key_k_offset(version,
						     &(ih->ih_key)) +
				     op_bytes_number(ih,
						     inode->i_sb->s_blocksize),
				     //pos_in_item * inode->i_sb->s_blocksize,
				     TYPE_INDIRECT, 3);	// key type is unimportant

929 930
			RFALSE(cpu_key_k_offset(&tmp_key) > cpu_key_k_offset(&key),
			       "green-805: invalid offset");
931 932 933 934 935 936 937 938 939
			blocks_needed =
			    1 +
			    ((cpu_key_k_offset(&key) -
			      cpu_key_k_offset(&tmp_key)) >> inode->i_sb->
			     s_blocksize_bits);

			if (blocks_needed == 1) {
				un = &unf_single;
			} else {
940
				un = kzalloc(min(blocks_needed, max_to_insert) * UNFM_P_SIZE, GFP_NOFS);
941 942 943 944
				if (!un) {
					un = &unf_single;
					blocks_needed = 1;
					max_to_insert = 0;
945
				}
946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984
			}
			if (blocks_needed <= max_to_insert) {
				/* we are going to add target block to the file. Use allocated
				   block for that */
				un[blocks_needed - 1] =
				    cpu_to_le32(allocated_block_nr);
				set_block_dev_mapped(bh_result,
						     allocated_block_nr, inode);
				set_buffer_new(bh_result);
				done = 1;
			} else {
				/* paste hole to the indirect item */
				/* If kmalloc failed, max_to_insert becomes zero and it means we
				   only have space for one block */
				blocks_needed =
				    max_to_insert ? max_to_insert : 1;
			}
			retval =
			    reiserfs_paste_into_item(th, &path, &tmp_key, inode,
						     (char *)un,
						     UNFM_P_SIZE *
						     blocks_needed);

			if (blocks_needed != 1)
				kfree(un);

			if (retval) {
				reiserfs_free_block(th, inode,
						    allocated_block_nr, 1);
				goto failure;
			}
			if (!done) {
				/* We need to mark new file size in case this function will be
				   interrupted/aborted later on. And we may do this only for
				   holes. */
				inode->i_size +=
				    inode->i_sb->s_blocksize * blocks_needed;
			}
		}
L
Linus Torvalds 已提交
985

986 987
		if (done == 1)
			break;
L
Linus Torvalds 已提交
988

989 990
		/* this loop could log more blocks than we had originally asked
		 ** for.  So, we have to allow the transaction to end if it is
991
		 ** too big or too full.  Update the inode so things are
992 993 994 995 996 997 998 999 1000 1001
		 ** consistent if we crash before the function returns
		 **
		 ** release the path so that anybody waiting on the path before
		 ** ending their transaction will be able to continue.
		 */
		if (journal_transaction_should_end(th, th->t_blocks_allocated)) {
			retval = restart_transaction(th, inode, &path);
			if (retval)
				goto failure;
		}
F
Frederic Weisbecker 已提交
1002 1003 1004 1005
		/*
		 * inserting indirect pointers for a hole can take a
		 * long time.  reschedule if needed and also release the write
		 * lock for others.
1006
		 */
1007 1008 1009 1010 1011
		if (need_resched()) {
			reiserfs_write_unlock_once(inode->i_sb, lock_depth);
			schedule();
			lock_depth = reiserfs_write_lock_once(inode->i_sb);
		}
L
Linus Torvalds 已提交
1012

1013 1014 1015 1016 1017 1018
		retval = search_for_position_by_key(inode->i_sb, &key, &path);
		if (retval == IO_ERROR) {
			retval = -EIO;
			goto failure;
		}
		if (retval == POSITION_FOUND) {
J
Jeff Mahoney 已提交
1019
			reiserfs_warning(inode->i_sb, "vs-825",
1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045
					 "%K should not be found", &key);
			retval = -EEXIST;
			if (allocated_block_nr)
				reiserfs_free_block(th, inode,
						    allocated_block_nr, 1);
			pathrelse(&path);
			goto failure;
		}
		bh = get_last_bh(&path);
		ih = get_ih(&path);
		item = get_item(&path);
		pos_in_item = path.pos_in_item;
	} while (1);

	retval = 0;

      failure:
	if (th && (!dangle || (retval && !th->t_trans_id))) {
		int err;
		if (th->t_trans_id)
			reiserfs_update_sd(th, inode);
		err = reiserfs_end_persistent_transaction(th);
		if (err)
			retval = err;
	}

1046
	reiserfs_write_unlock_once(inode->i_sb, lock_depth);
1047 1048
	reiserfs_check_path(&path);
	return retval;
L
Linus Torvalds 已提交
1049 1050 1051 1052
}

static int
reiserfs_readpages(struct file *file, struct address_space *mapping,
1053
		   struct list_head *pages, unsigned nr_pages)
L
Linus Torvalds 已提交
1054
{
1055
	return mpage_readpages(mapping, pages, nr_pages, reiserfs_get_block);
L
Linus Torvalds 已提交
1056 1057 1058 1059 1060 1061 1062
}

/* Compute real number of used bytes by file
 * Following three functions can go away when we'll have enough space in stat item
 */
static int real_space_diff(struct inode *inode, int sd_size)
{
1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081
	int bytes;
	loff_t blocksize = inode->i_sb->s_blocksize;

	if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode))
		return sd_size;

	/* End of file is also in full block with indirect reference, so round
	 ** up to the next block.
	 **
	 ** there is just no way to know if the tail is actually packed
	 ** on the file, so we have to assume it isn't.  When we pack the
	 ** tail, we add 4 bytes to pretend there really is an unformatted
	 ** node pointer
	 */
	bytes =
	    ((inode->i_size +
	      (blocksize - 1)) >> inode->i_sb->s_blocksize_bits) * UNFM_P_SIZE +
	    sd_size;
	return bytes;
L
Linus Torvalds 已提交
1082 1083 1084
}

static inline loff_t to_real_used_space(struct inode *inode, ulong blocks,
1085
					int sd_size)
L
Linus Torvalds 已提交
1086
{
1087 1088 1089 1090 1091 1092
	if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
		return inode->i_size +
		    (loff_t) (real_space_diff(inode, sd_size));
	}
	return ((loff_t) real_space_diff(inode, sd_size)) +
	    (((loff_t) blocks) << 9);
L
Linus Torvalds 已提交
1093 1094 1095 1096 1097
}

/* Compute number of blocks used by file in ReiserFS counting */
static inline ulong to_fake_used_blocks(struct inode *inode, int sd_size)
{
1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
	loff_t bytes = inode_get_bytes(inode);
	loff_t real_space = real_space_diff(inode, sd_size);

	/* keeps fsck and non-quota versions of reiserfs happy */
	if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
		bytes += (loff_t) 511;
	}

	/* files from before the quota patch might i_blocks such that
	 ** bytes < real_space.  Deal with that here to prevent it from
	 ** going negative.
	 */
	if (bytes < real_space)
		return 0;
	return (bytes - real_space) >> 9;
L
Linus Torvalds 已提交
1113 1114 1115 1116 1117 1118 1119 1120 1121 1122
}

//
// BAD: new directories have stat data of new type and all other items
// of old type. Version stored in the inode says about body items, so
// in update_stat_data we can not rely on inode, but have to check
// item version directly
//

// called by read_locked_inode
1123
static void init_inode(struct inode *inode, struct treepath *path)
L
Linus Torvalds 已提交
1124
{
1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140
	struct buffer_head *bh;
	struct item_head *ih;
	__u32 rdev;
	//int version = ITEM_VERSION_1;

	bh = PATH_PLAST_BUFFER(path);
	ih = PATH_PITEM_HEAD(path);

	copy_key(INODE_PKEY(inode), &(ih->ih_key));

	INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list));
	REISERFS_I(inode)->i_flags = 0;
	REISERFS_I(inode)->i_prealloc_block = 0;
	REISERFS_I(inode)->i_prealloc_count = 0;
	REISERFS_I(inode)->i_trans_id = 0;
	REISERFS_I(inode)->i_jl = NULL;
1141
	reiserfs_init_xattr_rwsem(inode);
1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173

	if (stat_data_v1(ih)) {
		struct stat_data_v1 *sd =
		    (struct stat_data_v1 *)B_I_PITEM(bh, ih);
		unsigned long blocks;

		set_inode_item_key_version(inode, KEY_FORMAT_3_5);
		set_inode_sd_version(inode, STAT_DATA_V1);
		inode->i_mode = sd_v1_mode(sd);
		inode->i_nlink = sd_v1_nlink(sd);
		inode->i_uid = sd_v1_uid(sd);
		inode->i_gid = sd_v1_gid(sd);
		inode->i_size = sd_v1_size(sd);
		inode->i_atime.tv_sec = sd_v1_atime(sd);
		inode->i_mtime.tv_sec = sd_v1_mtime(sd);
		inode->i_ctime.tv_sec = sd_v1_ctime(sd);
		inode->i_atime.tv_nsec = 0;
		inode->i_ctime.tv_nsec = 0;
		inode->i_mtime.tv_nsec = 0;

		inode->i_blocks = sd_v1_blocks(sd);
		inode->i_generation = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
		blocks = (inode->i_size + 511) >> 9;
		blocks = _ROUND_UP(blocks, inode->i_sb->s_blocksize >> 9);
		if (inode->i_blocks > blocks) {
			// there was a bug in <=3.5.23 when i_blocks could take negative
			// values. Starting from 3.5.17 this value could even be stored in
			// stat data. For such files we set i_blocks based on file
			// size. Just 2 notes: this can be wrong for sparce files. On-disk value will be
			// only updated if file's inode will ever change
			inode->i_blocks = blocks;
		}
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1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212
		rdev = sd_v1_rdev(sd);
		REISERFS_I(inode)->i_first_direct_byte =
		    sd_v1_first_direct_byte(sd);
		/* an early bug in the quota code can give us an odd number for the
		 ** block count.  This is incorrect, fix it here.
		 */
		if (inode->i_blocks & 1) {
			inode->i_blocks++;
		}
		inode_set_bytes(inode,
				to_real_used_space(inode, inode->i_blocks,
						   SD_V1_SIZE));
		/* nopack is initially zero for v1 objects. For v2 objects,
		   nopack is initialised from sd_attrs */
		REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
	} else {
		// new stat data found, but object may have old items
		// (directories and symlinks)
		struct stat_data *sd = (struct stat_data *)B_I_PITEM(bh, ih);

		inode->i_mode = sd_v2_mode(sd);
		inode->i_nlink = sd_v2_nlink(sd);
		inode->i_uid = sd_v2_uid(sd);
		inode->i_size = sd_v2_size(sd);
		inode->i_gid = sd_v2_gid(sd);
		inode->i_mtime.tv_sec = sd_v2_mtime(sd);
		inode->i_atime.tv_sec = sd_v2_atime(sd);
		inode->i_ctime.tv_sec = sd_v2_ctime(sd);
		inode->i_ctime.tv_nsec = 0;
		inode->i_mtime.tv_nsec = 0;
		inode->i_atime.tv_nsec = 0;
		inode->i_blocks = sd_v2_blocks(sd);
		rdev = sd_v2_rdev(sd);
		if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
			inode->i_generation =
			    le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
		else
			inode->i_generation = sd_v2_generation(sd);
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1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245
		if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
			set_inode_item_key_version(inode, KEY_FORMAT_3_5);
		else
			set_inode_item_key_version(inode, KEY_FORMAT_3_6);
		REISERFS_I(inode)->i_first_direct_byte = 0;
		set_inode_sd_version(inode, STAT_DATA_V2);
		inode_set_bytes(inode,
				to_real_used_space(inode, inode->i_blocks,
						   SD_V2_SIZE));
		/* read persistent inode attributes from sd and initalise
		   generic inode flags from them */
		REISERFS_I(inode)->i_attrs = sd_v2_attrs(sd);
		sd_attrs_to_i_attrs(sd_v2_attrs(sd), inode);
	}

	pathrelse(path);
	if (S_ISREG(inode->i_mode)) {
		inode->i_op = &reiserfs_file_inode_operations;
		inode->i_fop = &reiserfs_file_operations;
		inode->i_mapping->a_ops = &reiserfs_address_space_operations;
	} else if (S_ISDIR(inode->i_mode)) {
		inode->i_op = &reiserfs_dir_inode_operations;
		inode->i_fop = &reiserfs_dir_operations;
	} else if (S_ISLNK(inode->i_mode)) {
		inode->i_op = &reiserfs_symlink_inode_operations;
		inode->i_mapping->a_ops = &reiserfs_address_space_operations;
	} else {
		inode->i_blocks = 0;
		inode->i_op = &reiserfs_special_inode_operations;
		init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
	}
}
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// update new stat data with inode fields
1248
static void inode2sd(void *sd, struct inode *inode, loff_t size)
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{
1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268
	struct stat_data *sd_v2 = (struct stat_data *)sd;
	__u16 flags;

	set_sd_v2_mode(sd_v2, inode->i_mode);
	set_sd_v2_nlink(sd_v2, inode->i_nlink);
	set_sd_v2_uid(sd_v2, inode->i_uid);
	set_sd_v2_size(sd_v2, size);
	set_sd_v2_gid(sd_v2, inode->i_gid);
	set_sd_v2_mtime(sd_v2, inode->i_mtime.tv_sec);
	set_sd_v2_atime(sd_v2, inode->i_atime.tv_sec);
	set_sd_v2_ctime(sd_v2, inode->i_ctime.tv_sec);
	set_sd_v2_blocks(sd_v2, to_fake_used_blocks(inode, SD_V2_SIZE));
	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
		set_sd_v2_rdev(sd_v2, new_encode_dev(inode->i_rdev));
	else
		set_sd_v2_generation(sd_v2, inode->i_generation);
	flags = REISERFS_I(inode)->i_attrs;
	i_attrs_to_sd_attrs(inode, &flags);
	set_sd_v2_attrs(sd_v2, flags);
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}

// used to copy inode's fields to old stat data
1272
static void inode2sd_v1(void *sd, struct inode *inode, loff_t size)
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{
1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288
	struct stat_data_v1 *sd_v1 = (struct stat_data_v1 *)sd;

	set_sd_v1_mode(sd_v1, inode->i_mode);
	set_sd_v1_uid(sd_v1, inode->i_uid);
	set_sd_v1_gid(sd_v1, inode->i_gid);
	set_sd_v1_nlink(sd_v1, inode->i_nlink);
	set_sd_v1_size(sd_v1, size);
	set_sd_v1_atime(sd_v1, inode->i_atime.tv_sec);
	set_sd_v1_ctime(sd_v1, inode->i_ctime.tv_sec);
	set_sd_v1_mtime(sd_v1, inode->i_mtime.tv_sec);

	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
		set_sd_v1_rdev(sd_v1, new_encode_dev(inode->i_rdev));
	else
		set_sd_v1_blocks(sd_v1, to_fake_used_blocks(inode, SD_V1_SIZE));
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1290 1291 1292 1293
	// Sigh. i_first_direct_byte is back
	set_sd_v1_first_direct_byte(sd_v1,
				    REISERFS_I(inode)->i_first_direct_byte);
}
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/* NOTE, you must prepare the buffer head before sending it here,
** and then log it after the call
*/
1298
static void update_stat_data(struct treepath *path, struct inode *inode,
1299
			     loff_t size)
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{
1301 1302 1303 1304 1305 1306 1307
	struct buffer_head *bh;
	struct item_head *ih;

	bh = PATH_PLAST_BUFFER(path);
	ih = PATH_PITEM_HEAD(path);

	if (!is_statdata_le_ih(ih))
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		reiserfs_panic(inode->i_sb, "vs-13065", "key %k, found item %h",
1309 1310 1311 1312 1313 1314 1315 1316
			       INODE_PKEY(inode), ih);

	if (stat_data_v1(ih)) {
		// path points to old stat data
		inode2sd_v1(B_I_PITEM(bh, ih), inode, size);
	} else {
		inode2sd(B_I_PITEM(bh, ih), inode, size);
	}
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1318 1319
	return;
}
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1321 1322
void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th,
			     struct inode *inode, loff_t size)
L
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{
1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339
	struct cpu_key key;
	INITIALIZE_PATH(path);
	struct buffer_head *bh;
	int fs_gen;
	struct item_head *ih, tmp_ih;
	int retval;

	BUG_ON(!th->t_trans_id);

	make_cpu_key(&key, inode, SD_OFFSET, TYPE_STAT_DATA, 3);	//key type is unimportant

	for (;;) {
		int pos;
		/* look for the object's stat data */
		retval = search_item(inode->i_sb, &key, &path);
		if (retval == IO_ERROR) {
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			reiserfs_error(inode->i_sb, "vs-13050",
				       "i/o failure occurred trying to "
				       "update %K stat data", &key);
1343 1344 1345 1346 1347 1348 1349 1350 1351
			return;
		}
		if (retval == ITEM_NOT_FOUND) {
			pos = PATH_LAST_POSITION(&path);
			pathrelse(&path);
			if (inode->i_nlink == 0) {
				/*reiserfs_warning (inode->i_sb, "vs-13050: reiserfs_update_sd: i_nlink == 0, stat data not found"); */
				return;
			}
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			reiserfs_warning(inode->i_sb, "vs-13060",
					 "stat data of object %k (nlink == %d) "
					 "not found (pos %d)",
1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380
					 INODE_PKEY(inode), inode->i_nlink,
					 pos);
			reiserfs_check_path(&path);
			return;
		}

		/* sigh, prepare_for_journal might schedule.  When it schedules the
		 ** FS might change.  We have to detect that, and loop back to the
		 ** search if the stat data item has moved
		 */
		bh = get_last_bh(&path);
		ih = get_ih(&path);
		copy_item_head(&tmp_ih, ih);
		fs_gen = get_generation(inode->i_sb);
		reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
		if (fs_changed(fs_gen, inode->i_sb)
		    && item_moved(&tmp_ih, &path)) {
			reiserfs_restore_prepared_buffer(inode->i_sb, bh);
			continue;	/* Stat_data item has been moved after scheduling. */
		}
		break;
	}
	update_stat_data(&path, inode, size);
	journal_mark_dirty(th, th->t_super, bh);
	pathrelse(&path);
	return;
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}

/* reiserfs_read_locked_inode is called to read the inode off disk, and it
** does a make_bad_inode when things go wrong.  But, we need to make sure
** and clear the key in the private portion of the inode, otherwise a
** corresponding iput might try to delete whatever object the inode last
** represented.
*/
1389 1390 1391 1392
static void reiserfs_make_bad_inode(struct inode *inode)
{
	memset(INODE_PKEY(inode), 0, KEY_SIZE);
	make_bad_inode(inode);
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}

//
// initially this function was derived from minix or ext2's analog and
// evolved as the prototype did
//

1400
int reiserfs_init_locked_inode(struct inode *inode, void *p)
L
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{
1402 1403 1404 1405
	struct reiserfs_iget_args *args = (struct reiserfs_iget_args *)p;
	inode->i_ino = args->objectid;
	INODE_PKEY(inode)->k_dir_id = cpu_to_le32(args->dirid);
	return 0;
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}

/* looks for stat data in the tree, and fills up the fields of in-core
   inode stat data fields */
1410 1411
void reiserfs_read_locked_inode(struct inode *inode,
				struct reiserfs_iget_args *args)
L
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{
1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430
	INITIALIZE_PATH(path_to_sd);
	struct cpu_key key;
	unsigned long dirino;
	int retval;

	dirino = args->dirid;

	/* set version 1, version 2 could be used too, because stat data
	   key is the same in both versions */
	key.version = KEY_FORMAT_3_5;
	key.on_disk_key.k_dir_id = dirino;
	key.on_disk_key.k_objectid = inode->i_ino;
	key.on_disk_key.k_offset = 0;
	key.on_disk_key.k_type = 0;

	/* look for the object's stat data */
	retval = search_item(inode->i_sb, &key, &path_to_sd);
	if (retval == IO_ERROR) {
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		reiserfs_error(inode->i_sb, "vs-13070",
			       "i/o failure occurred trying to find "
			       "stat data of %K", &key);
1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451
		reiserfs_make_bad_inode(inode);
		return;
	}
	if (retval != ITEM_FOUND) {
		/* a stale NFS handle can trigger this without it being an error */
		pathrelse(&path_to_sd);
		reiserfs_make_bad_inode(inode);
		inode->i_nlink = 0;
		return;
	}

	init_inode(inode, &path_to_sd);

	/* It is possible that knfsd is trying to access inode of a file
	   that is being removed from the disk by some other thread. As we
	   update sd on unlink all that is required is to check for nlink
	   here. This bug was first found by Sizif when debugging
	   SquidNG/Butterfly, forgotten, and found again after Philippe
1452
	   Gramoulle <philippe.gramoulle@mmania.com> reproduced it.
1453 1454 1455 1456 1457 1458 1459 1460 1461 1462

	   More logical fix would require changes in fs/inode.c:iput() to
	   remove inode from hash-table _after_ fs cleaned disk stuff up and
	   in iget() to return NULL if I_FREEING inode is found in
	   hash-table. */
	/* Currently there is one place where it's ok to meet inode with
	   nlink==0: processing of open-unlinked and half-truncated files
	   during mount (fs/reiserfs/super.c:finish_unfinished()). */
	if ((inode->i_nlink == 0) &&
	    !REISERFS_SB(inode->i_sb)->s_is_unlinked_ok) {
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		reiserfs_warning(inode->i_sb, "vs-13075",
1464 1465 1466 1467 1468 1469 1470
				 "dead inode read from disk %K. "
				 "This is likely to be race with knfsd. Ignore",
				 &key);
		reiserfs_make_bad_inode(inode);
	}

	reiserfs_check_path(&path_to_sd);	/* init inode should be relsing */
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}

/**
 * reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked().
 *
 * @inode:    inode from hash table to check
 * @opaque:   "cookie" passed to iget5_locked(). This is &reiserfs_iget_args.
 *
 * This function is called by iget5_locked() to distinguish reiserfs inodes
 * having the same inode numbers. Such inodes can only exist due to some
 * error condition. One of them should be bad. Inodes with identical
 * inode numbers (objectids) are distinguished by parent directory ids.
 *
 */
1486
int reiserfs_find_actor(struct inode *inode, void *opaque)
L
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{
1488
	struct reiserfs_iget_args *args;
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1490 1491 1492 1493
	args = opaque;
	/* args is already in CPU order */
	return (inode->i_ino == args->objectid) &&
	    (le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid);
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}

1496
struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key)
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{
1498 1499 1500 1501 1502
	struct inode *inode;
	struct reiserfs_iget_args args;

	args.objectid = key->on_disk_key.k_objectid;
	args.dirid = key->on_disk_key.k_dir_id;
1503
	reiserfs_write_unlock(s);
1504 1505 1506
	inode = iget5_locked(s, key->on_disk_key.k_objectid,
			     reiserfs_find_actor, reiserfs_init_locked_inode,
			     (void *)(&args));
1507
	reiserfs_write_lock(s);
1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521
	if (!inode)
		return ERR_PTR(-ENOMEM);

	if (inode->i_state & I_NEW) {
		reiserfs_read_locked_inode(inode, &args);
		unlock_new_inode(inode);
	}

	if (comp_short_keys(INODE_PKEY(inode), key) || is_bad_inode(inode)) {
		/* either due to i/o error or a stale NFS handle */
		iput(inode);
		inode = NULL;
	}
	return inode;
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}

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static struct dentry *reiserfs_get_dentry(struct super_block *sb,
	u32 objectid, u32 dir_id, u32 generation)

L
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{
1528 1529 1530
	struct cpu_key key;
	struct inode *inode;

C
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	key.on_disk_key.k_objectid = objectid;
	key.on_disk_key.k_dir_id = dir_id;
1533 1534
	reiserfs_write_lock(sb);
	inode = reiserfs_iget(sb, &key);
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	if (inode && !IS_ERR(inode) && generation != 0 &&
	    generation != inode->i_generation) {
1537 1538 1539 1540
		iput(inode);
		inode = NULL;
	}
	reiserfs_write_unlock(sb);
1541 1542

	return d_obtain_alias(inode);
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}

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struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
		int fh_len, int fh_type)
1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559
{
	/* fhtype happens to reflect the number of u32s encoded.
	 * due to a bug in earlier code, fhtype might indicate there
	 * are more u32s then actually fitted.
	 * so if fhtype seems to be more than len, reduce fhtype.
	 * Valid types are:
	 *   2 - objectid + dir_id - legacy support
	 *   3 - objectid + dir_id + generation
	 *   4 - objectid + dir_id + objectid and dirid of parent - legacy
	 *   5 - objectid + dir_id + generation + objectid and dirid of parent
	 *   6 - as above plus generation of directory
	 * 6 does not fit in NFSv2 handles
	 */
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	if (fh_type > fh_len) {
		if (fh_type != 6 || fh_len != 5)
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			reiserfs_warning(sb, "reiserfs-13077",
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				"nfsd/reiserfs, fhtype=%d, len=%d - odd",
				fh_type, fh_len);
		fh_type = 5;
1566 1567
	}

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	return reiserfs_get_dentry(sb, fid->raw[0], fid->raw[1],
		(fh_type == 3 || fh_type >= 5) ? fid->raw[2] : 0);
}
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C
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struct dentry *reiserfs_fh_to_parent(struct super_block *sb, struct fid *fid,
		int fh_len, int fh_type)
{
	if (fh_type < 4)
		return NULL;

	return reiserfs_get_dentry(sb,
		(fh_type >= 5) ? fid->raw[3] : fid->raw[2],
		(fh_type >= 5) ? fid->raw[4] : fid->raw[3],
		(fh_type == 6) ? fid->raw[5] : 0);
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}

1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612
int reiserfs_encode_fh(struct dentry *dentry, __u32 * data, int *lenp,
		       int need_parent)
{
	struct inode *inode = dentry->d_inode;
	int maxlen = *lenp;

	if (maxlen < 3)
		return 255;

	data[0] = inode->i_ino;
	data[1] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
	data[2] = inode->i_generation;
	*lenp = 3;
	/* no room for directory info? return what we've stored so far */
	if (maxlen < 5 || !need_parent)
		return 3;

	spin_lock(&dentry->d_lock);
	inode = dentry->d_parent->d_inode;
	data[3] = inode->i_ino;
	data[4] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
	*lenp = 5;
	if (maxlen >= 6) {
		data[5] = inode->i_generation;
		*lenp = 6;
	}
	spin_unlock(&dentry->d_lock);
	return *lenp;
}
L
Linus Torvalds 已提交
1613 1614 1615 1616 1617 1618 1619 1620

/* looks for stat data, then copies fields to it, marks the buffer
   containing stat data as dirty */
/* reiserfs inodes are never really dirty, since the dirty inode call
** always logs them.  This call allows the VFS inode marking routines
** to properly mark inodes for datasync and such, but only actually
** does something when called for a synchronous update.
*/
1621
int reiserfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1622 1623 1624 1625 1626 1627 1628
{
	struct reiserfs_transaction_handle th;
	int jbegin_count = 1;

	if (inode->i_sb->s_flags & MS_RDONLY)
		return -EROFS;
	/* memory pressure can sometimes initiate write_inode calls with sync == 1,
1629
	 ** these cases are just when the system needs ram, not when the
1630 1631 1632
	 ** inode needs to reach disk for safety, and they can safely be
	 ** ignored because the altered inode has already been logged.
	 */
1633
	if (wbc->sync_mode == WB_SYNC_ALL && !(current->flags & PF_MEMALLOC)) {
1634 1635 1636 1637 1638 1639 1640 1641
		reiserfs_write_lock(inode->i_sb);
		if (!journal_begin(&th, inode->i_sb, jbegin_count)) {
			reiserfs_update_sd(&th, inode);
			journal_end_sync(&th, inode->i_sb, jbegin_count);
		}
		reiserfs_write_unlock(inode->i_sb);
	}
	return 0;
L
Linus Torvalds 已提交
1642 1643 1644 1645
}

/* stat data of new object is inserted already, this inserts the item
   containing "." and ".." entries */
1646 1647
static int reiserfs_new_directory(struct reiserfs_transaction_handle *th,
				  struct inode *inode,
1648
				  struct item_head *ih, struct treepath *path,
1649
				  struct inode *dir)
L
Linus Torvalds 已提交
1650
{
1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686
	struct super_block *sb = th->t_super;
	char empty_dir[EMPTY_DIR_SIZE];
	char *body = empty_dir;
	struct cpu_key key;
	int retval;

	BUG_ON(!th->t_trans_id);

	_make_cpu_key(&key, KEY_FORMAT_3_5, le32_to_cpu(ih->ih_key.k_dir_id),
		      le32_to_cpu(ih->ih_key.k_objectid), DOT_OFFSET,
		      TYPE_DIRENTRY, 3 /*key length */ );

	/* compose item head for new item. Directories consist of items of
	   old type (ITEM_VERSION_1). Do not set key (second arg is 0), it
	   is done by reiserfs_new_inode */
	if (old_format_only(sb)) {
		make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
				  TYPE_DIRENTRY, EMPTY_DIR_SIZE_V1, 2);

		make_empty_dir_item_v1(body, ih->ih_key.k_dir_id,
				       ih->ih_key.k_objectid,
				       INODE_PKEY(dir)->k_dir_id,
				       INODE_PKEY(dir)->k_objectid);
	} else {
		make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
				  TYPE_DIRENTRY, EMPTY_DIR_SIZE, 2);

		make_empty_dir_item(body, ih->ih_key.k_dir_id,
				    ih->ih_key.k_objectid,
				    INODE_PKEY(dir)->k_dir_id,
				    INODE_PKEY(dir)->k_objectid);
	}

	/* look for place in the tree for new item */
	retval = search_item(sb, &key, path);
	if (retval == IO_ERROR) {
J
Jeff Mahoney 已提交
1687 1688
		reiserfs_error(sb, "vs-13080",
			       "i/o failure occurred creating new directory");
1689 1690 1691 1692
		return -EIO;
	}
	if (retval == ITEM_FOUND) {
		pathrelse(path);
J
Jeff Mahoney 已提交
1693
		reiserfs_warning(sb, "vs-13070",
1694 1695 1696 1697
				 "object with this key exists (%k)",
				 &(ih->ih_key));
		return -EEXIST;
	}
L
Linus Torvalds 已提交
1698

1699 1700 1701
	/* insert item, that is empty directory item */
	return reiserfs_insert_item(th, path, &key, ih, inode, body);
}
L
Linus Torvalds 已提交
1702 1703 1704

/* stat data of object has been inserted, this inserts the item
   containing the body of symlink */
1705 1706
static int reiserfs_new_symlink(struct reiserfs_transaction_handle *th, struct inode *inode,	/* Inode of symlink */
				struct item_head *ih,
1707
				struct treepath *path, const char *symname,
1708
				int item_len)
L
Linus Torvalds 已提交
1709
{
1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726
	struct super_block *sb = th->t_super;
	struct cpu_key key;
	int retval;

	BUG_ON(!th->t_trans_id);

	_make_cpu_key(&key, KEY_FORMAT_3_5,
		      le32_to_cpu(ih->ih_key.k_dir_id),
		      le32_to_cpu(ih->ih_key.k_objectid),
		      1, TYPE_DIRECT, 3 /*key length */ );

	make_le_item_head(ih, NULL, KEY_FORMAT_3_5, 1, TYPE_DIRECT, item_len,
			  0 /*free_space */ );

	/* look for place in the tree for new item */
	retval = search_item(sb, &key, path);
	if (retval == IO_ERROR) {
J
Jeff Mahoney 已提交
1727 1728
		reiserfs_error(sb, "vs-13080",
			       "i/o failure occurred creating new symlink");
1729 1730 1731 1732
		return -EIO;
	}
	if (retval == ITEM_FOUND) {
		pathrelse(path);
J
Jeff Mahoney 已提交
1733
		reiserfs_warning(sb, "vs-13080",
1734 1735 1736 1737
				 "object with this key exists (%k)",
				 &(ih->ih_key));
		return -EEXIST;
	}
L
Linus Torvalds 已提交
1738

1739 1740 1741
	/* insert item, that is body of symlink */
	return reiserfs_insert_item(th, path, &key, ih, inode, symname);
}
L
Linus Torvalds 已提交
1742 1743 1744 1745

/* inserts the stat data into the tree, and then calls
   reiserfs_new_directory (to insert ".", ".." item if new object is
   directory) or reiserfs_new_symlink (to insert symlink body if new
1746
   object is symlink) or nothing (if new object is regular file)
L
Linus Torvalds 已提交
1747 1748 1749 1750 1751

   NOTE! uid and gid must already be set in the inode.  If we return
   non-zero due to an error, we have to drop the quota previously allocated
   for the fresh inode.  This can only be done outside a transaction, so
   if we return non-zero, we also end the transaction.  */
1752 1753
int reiserfs_new_inode(struct reiserfs_transaction_handle *th,
		       struct inode *dir, int mode, const char *symname,
1754
		       /* 0 for regular, EMTRY_DIR_SIZE for dirs,
1755 1756
		          strlen (symname) for symlinks) */
		       loff_t i_size, struct dentry *dentry,
1757 1758
		       struct inode *inode,
		       struct reiserfs_security_handle *security)
L
Linus Torvalds 已提交
1759
{
1760
	struct super_block *sb;
A
Al Viro 已提交
1761
	struct reiserfs_iget_args args;
1762 1763 1764 1765 1766 1767 1768 1769 1770
	INITIALIZE_PATH(path_to_key);
	struct cpu_key key;
	struct item_head ih;
	struct stat_data sd;
	int retval;
	int err;

	BUG_ON(!th->t_trans_id);

1771
	dquot_initialize(inode);
1772 1773
	err = dquot_alloc_inode(inode);
	if (err)
1774
		goto out_end_trans;
1775
	if (!dir->i_nlink) {
1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788
		err = -EPERM;
		goto out_bad_inode;
	}

	sb = dir->i_sb;

	/* item head of new item */
	ih.ih_key.k_dir_id = reiserfs_choose_packing(dir);
	ih.ih_key.k_objectid = cpu_to_le32(reiserfs_get_unused_objectid(th));
	if (!ih.ih_key.k_objectid) {
		err = -ENOMEM;
		goto out_bad_inode;
	}
A
Al Viro 已提交
1789
	args.objectid = inode->i_ino = le32_to_cpu(ih.ih_key.k_objectid);
A
Al Viro 已提交
1790 1791 1792 1793 1794 1795
	if (old_format_only(sb))
		make_le_item_head(&ih, NULL, KEY_FORMAT_3_5, SD_OFFSET,
				  TYPE_STAT_DATA, SD_V1_SIZE, MAX_US_INT);
	else
		make_le_item_head(&ih, NULL, KEY_FORMAT_3_6, SD_OFFSET,
				  TYPE_STAT_DATA, SD_SIZE, MAX_US_INT);
A
Al Viro 已提交
1796 1797 1798 1799 1800 1801 1802
	memcpy(INODE_PKEY(inode), &(ih.ih_key), KEY_SIZE);
	args.dirid = le32_to_cpu(ih.ih_key.k_dir_id);
	if (insert_inode_locked4(inode, args.objectid,
			     reiserfs_find_actor, &args) < 0) {
		err = -EINVAL;
		goto out_bad_inode;
	}
1803
	if (old_format_only(sb))
1804
		/* not a perfect generation count, as object ids can be reused, but
1805 1806 1807 1808 1809 1810
		 ** this is as good as reiserfs can do right now.
		 ** note that the private part of inode isn't filled in yet, we have
		 ** to use the directory.
		 */
		inode->i_generation = le32_to_cpu(INODE_PKEY(dir)->k_objectid);
	else
L
Linus Torvalds 已提交
1811
#if defined( USE_INODE_GENERATION_COUNTER )
1812 1813
		inode->i_generation =
		    le32_to_cpu(REISERFS_SB(sb)->s_rs->s_inode_generation);
L
Linus Torvalds 已提交
1814
#else
1815
		inode->i_generation = ++event;
L
Linus Torvalds 已提交
1816 1817
#endif

1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842
	/* fill stat data */
	inode->i_nlink = (S_ISDIR(mode) ? 2 : 1);

	/* uid and gid must already be set by the caller for quota init */

	/* symlink cannot be immutable or append only, right? */
	if (S_ISLNK(inode->i_mode))
		inode->i_flags &= ~(S_IMMUTABLE | S_APPEND);

	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
	inode->i_size = i_size;
	inode->i_blocks = 0;
	inode->i_bytes = 0;
	REISERFS_I(inode)->i_first_direct_byte = S_ISLNK(mode) ? 1 :
	    U32_MAX /*NO_BYTES_IN_DIRECT_ITEM */ ;

	INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list));
	REISERFS_I(inode)->i_flags = 0;
	REISERFS_I(inode)->i_prealloc_block = 0;
	REISERFS_I(inode)->i_prealloc_count = 0;
	REISERFS_I(inode)->i_trans_id = 0;
	REISERFS_I(inode)->i_jl = NULL;
	REISERFS_I(inode)->i_attrs =
	    REISERFS_I(dir)->i_attrs & REISERFS_INHERIT_MASK;
	sd_attrs_to_i_attrs(REISERFS_I(inode)->i_attrs, inode);
1843
	reiserfs_init_xattr_rwsem(inode);
1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884

	/* key to search for correct place for new stat data */
	_make_cpu_key(&key, KEY_FORMAT_3_6, le32_to_cpu(ih.ih_key.k_dir_id),
		      le32_to_cpu(ih.ih_key.k_objectid), SD_OFFSET,
		      TYPE_STAT_DATA, 3 /*key length */ );

	/* find proper place for inserting of stat data */
	retval = search_item(sb, &key, &path_to_key);
	if (retval == IO_ERROR) {
		err = -EIO;
		goto out_bad_inode;
	}
	if (retval == ITEM_FOUND) {
		pathrelse(&path_to_key);
		err = -EEXIST;
		goto out_bad_inode;
	}
	if (old_format_only(sb)) {
		if (inode->i_uid & ~0xffff || inode->i_gid & ~0xffff) {
			pathrelse(&path_to_key);
			/* i_uid or i_gid is too big to be stored in stat data v3.5 */
			err = -EINVAL;
			goto out_bad_inode;
		}
		inode2sd_v1(&sd, inode, inode->i_size);
	} else {
		inode2sd(&sd, inode, inode->i_size);
	}
	// store in in-core inode the key of stat data and version all
	// object items will have (directory items will have old offset
	// format, other new objects will consist of new items)
	if (old_format_only(sb) || S_ISDIR(mode) || S_ISLNK(mode))
		set_inode_item_key_version(inode, KEY_FORMAT_3_5);
	else
		set_inode_item_key_version(inode, KEY_FORMAT_3_6);
	if (old_format_only(sb))
		set_inode_sd_version(inode, STAT_DATA_V1);
	else
		set_inode_sd_version(inode, STAT_DATA_V2);

	/* insert the stat data into the tree */
L
Linus Torvalds 已提交
1885
#ifdef DISPLACE_NEW_PACKING_LOCALITIES
1886 1887
	if (REISERFS_I(dir)->new_packing_locality)
		th->displace_new_blocks = 1;
L
Linus Torvalds 已提交
1888
#endif
1889 1890 1891 1892 1893 1894 1895 1896
	retval =
	    reiserfs_insert_item(th, &path_to_key, &key, &ih, inode,
				 (char *)(&sd));
	if (retval) {
		err = retval;
		reiserfs_check_path(&path_to_key);
		goto out_bad_inode;
	}
L
Linus Torvalds 已提交
1897
#ifdef DISPLACE_NEW_PACKING_LOCALITIES
1898 1899
	if (!th->displace_new_blocks)
		REISERFS_I(dir)->new_packing_locality = 0;
L
Linus Torvalds 已提交
1900
#endif
1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922
	if (S_ISDIR(mode)) {
		/* insert item with "." and ".." */
		retval =
		    reiserfs_new_directory(th, inode, &ih, &path_to_key, dir);
	}

	if (S_ISLNK(mode)) {
		/* insert body of symlink */
		if (!old_format_only(sb))
			i_size = ROUND_UP(i_size);
		retval =
		    reiserfs_new_symlink(th, inode, &ih, &path_to_key, symname,
					 i_size);
	}
	if (retval) {
		err = retval;
		reiserfs_check_path(&path_to_key);
		journal_end(th, th->t_super, th->t_blocks_allocated);
		goto out_inserted_sd;
	}

	if (reiserfs_posixacl(inode->i_sb)) {
J
Jeff Mahoney 已提交
1923
		retval = reiserfs_inherit_default_acl(th, dir, dentry, inode);
1924 1925 1926 1927 1928 1929 1930
		if (retval) {
			err = retval;
			reiserfs_check_path(&path_to_key);
			journal_end(th, th->t_super, th->t_blocks_allocated);
			goto out_inserted_sd;
		}
	} else if (inode->i_sb->s_flags & MS_POSIXACL) {
J
Jeff Mahoney 已提交
1931 1932
		reiserfs_warning(inode->i_sb, "jdm-13090",
				 "ACLs aren't enabled in the fs, "
1933
				 "but vfs thinks they are!");
1934 1935
	} else if (IS_PRIVATE(dir))
		inode->i_flags |= S_PRIVATE;
1936

1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947
	if (security->name) {
		retval = reiserfs_security_write(th, inode, security);
		if (retval) {
			err = retval;
			reiserfs_check_path(&path_to_key);
			retval = journal_end(th, th->t_super,
					     th->t_blocks_allocated);
			if (retval)
				err = retval;
			goto out_inserted_sd;
		}
1948 1949 1950 1951 1952 1953
	}

	reiserfs_update_sd(th, inode);
	reiserfs_check_path(&path_to_key);

	return 0;
L
Linus Torvalds 已提交
1954 1955 1956 1957 1958

/* it looks like you can easily compress these two goto targets into
 * one.  Keeping it like this doesn't actually hurt anything, and they
 * are place holders for what the quota code actually needs.
 */
1959 1960 1961 1962 1963
      out_bad_inode:
	/* Invalidate the object, nothing was inserted yet */
	INODE_PKEY(inode)->k_objectid = 0;

	/* Quota change must be inside a transaction for journaling */
1964
	dquot_free_inode(inode);
1965 1966 1967 1968

      out_end_trans:
	journal_end(th, th->t_super, th->t_blocks_allocated);
	/* Drop can be outside and it needs more credits so it's better to have it outside */
1969
	dquot_drop(inode);
1970 1971 1972 1973 1974 1975
	inode->i_flags |= S_NOQUOTA;
	make_bad_inode(inode);

      out_inserted_sd:
	inode->i_nlink = 0;
	th->t_trans_id = 0;	/* so the caller can't use this handle later */
A
Al Viro 已提交
1976
	unlock_new_inode(inode); /* OK to do even if we hadn't locked it */
1977
	iput(inode);
1978
	return err;
L
Linus Torvalds 已提交
1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993
}

/*
** finds the tail page in the page cache,
** reads the last block in.
**
** On success, page_result is set to a locked, pinned page, and bh_result
** is set to an up to date buffer for the last block in the file.  returns 0.
**
** tail conversion is not done, so bh_result might not be valid for writing
** check buffer_mapped(bh_result) and bh_result->b_blocknr != 0 before
** trying to write the block.
**
** on failure, nonzero is returned, page_result and bh_result are untouched.
*/
1994
static int grab_tail_page(struct inode *inode,
1995 1996 1997 1998 1999 2000 2001
			  struct page **page_result,
			  struct buffer_head **bh_result)
{

	/* we want the page with the last byte in the file,
	 ** not the page that will hold the next byte for appending
	 */
2002
	unsigned long index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT;
2003 2004
	unsigned long pos = 0;
	unsigned long start = 0;
2005 2006
	unsigned long blocksize = inode->i_sb->s_blocksize;
	unsigned long offset = (inode->i_size) & (PAGE_CACHE_SIZE - 1);
2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
	struct buffer_head *bh;
	struct buffer_head *head;
	struct page *page;
	int error;

	/* we know that we are only called with inode->i_size > 0.
	 ** we also know that a file tail can never be as big as a block
	 ** If i_size % blocksize == 0, our file is currently block aligned
	 ** and it won't need converting or zeroing after a truncate.
	 */
	if ((offset & (blocksize - 1)) == 0) {
		return -ENOENT;
	}
2020
	page = grab_cache_page(inode->i_mapping, index);
2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048
	error = -ENOMEM;
	if (!page) {
		goto out;
	}
	/* start within the page of the last block in the file */
	start = (offset / blocksize) * blocksize;

	error = block_prepare_write(page, start, offset,
				    reiserfs_get_block_create_0);
	if (error)
		goto unlock;

	head = page_buffers(page);
	bh = head;
	do {
		if (pos >= start) {
			break;
		}
		bh = bh->b_this_page;
		pos += blocksize;
	} while (bh != head);

	if (!buffer_uptodate(bh)) {
		/* note, this should never happen, prepare_write should
		 ** be taking care of this for us.  If the buffer isn't up to date,
		 ** I've screwed up the code to find the buffer, or the code to
		 ** call prepare_write
		 */
2049
		reiserfs_error(inode->i_sb, "clm-6000",
J
Jeff Mahoney 已提交
2050
			       "error reading block %lu", bh->b_blocknr);
2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063
		error = -EIO;
		goto unlock;
	}
	*bh_result = bh;
	*page_result = page;

      out:
	return error;

      unlock:
	unlock_page(page);
	page_cache_release(page);
	return error;
L
Linus Torvalds 已提交
2064 2065 2066 2067 2068 2069 2070 2071
}

/*
** vfs version of truncate file.  Must NOT be called with
** a transaction already started.
**
** some code taken from block_truncate_page
*/
2072
int reiserfs_truncate_file(struct inode *inode, int update_timestamps)
2073 2074 2075
{
	struct reiserfs_transaction_handle th;
	/* we want the offset for the first byte after the end of the file */
2076 2077
	unsigned long offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
	unsigned blocksize = inode->i_sb->s_blocksize;
2078 2079 2080 2081
	unsigned length;
	struct page *page = NULL;
	int error;
	struct buffer_head *bh = NULL;
2082
	int err2;
2083
	int lock_depth;
2084

2085
	lock_depth = reiserfs_write_lock_once(inode->i_sb);
2086

2087 2088 2089
	if (inode->i_size > 0) {
		error = grab_tail_page(inode, &page, &bh);
		if (error) {
2090
			// -ENOENT means we truncated past the end of the file,
2091 2092 2093
			// and get_block_create_0 could not find a block to read in,
			// which is ok.
			if (error != -ENOENT)
2094
				reiserfs_error(inode->i_sb, "clm-6001",
J
Jeff Mahoney 已提交
2095 2096
					       "grab_tail_page failed %d",
					       error);
2097 2098 2099 2100
			page = NULL;
			bh = NULL;
		}
	}
L
Linus Torvalds 已提交
2101

2102 2103 2104 2105 2106
	/* so, if page != NULL, we have a buffer head for the offset at
	 ** the end of the file. if the bh is mapped, and bh->b_blocknr != 0,
	 ** then we have an unformatted node.  Otherwise, we have a direct item,
	 ** and no zeroing is required on disk.  We zero after the truncate,
	 ** because the truncate might pack the item anyway
2107
	 ** (it will unmap bh if it packs).
L
Linus Torvalds 已提交
2108
	 */
2109 2110 2111
	/* it is enough to reserve space in transaction for 2 balancings:
	   one for "save" link adding and another for the first
	   cut_from_item. 1 is for update_sd */
2112
	error = journal_begin(&th, inode->i_sb,
2113 2114 2115
			      JOURNAL_PER_BALANCE_CNT * 2 + 1);
	if (error)
		goto out;
2116
	reiserfs_update_inode_transaction(inode);
2117 2118 2119 2120
	if (update_timestamps)
		/* we are doing real truncate: if the system crashes before the last
		   transaction of truncating gets committed - on reboot the file
		   either appears truncated properly or not truncated at all */
2121 2122
		add_save_link(&th, inode, 1);
	err2 = reiserfs_do_truncate(&th, inode, page, update_timestamps);
2123
	error =
2124
	    journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT * 2 + 1);
2125 2126 2127
	if (error)
		goto out;

2128 2129 2130 2131 2132 2133
	/* check reiserfs_do_truncate after ending the transaction */
	if (err2) {
		error = err2;
  		goto out;
	}
	
2134
	if (update_timestamps) {
2135
		error = remove_save_link(inode, 1 /* truncate */);
2136 2137 2138 2139 2140 2141 2142 2143 2144
		if (error)
			goto out;
	}

	if (page) {
		length = offset & (blocksize - 1);
		/* if we are not on a block boundary */
		if (length) {
			length = blocksize - length;
2145
			zero_user(page, offset, length);
2146 2147 2148 2149 2150 2151 2152 2153
			if (buffer_mapped(bh) && bh->b_blocknr != 0) {
				mark_buffer_dirty(bh);
			}
		}
		unlock_page(page);
		page_cache_release(page);
	}

2154 2155
	reiserfs_write_unlock_once(inode->i_sb, lock_depth);

2156 2157 2158 2159 2160 2161
	return 0;
      out:
	if (page) {
		unlock_page(page);
		page_cache_release(page);
	}
2162 2163 2164

	reiserfs_write_unlock_once(inode->i_sb, lock_depth);

2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181
	return error;
}

static int map_block_for_writepage(struct inode *inode,
				   struct buffer_head *bh_result,
				   unsigned long block)
{
	struct reiserfs_transaction_handle th;
	int fs_gen;
	struct item_head tmp_ih;
	struct item_head *ih;
	struct buffer_head *bh;
	__le32 *item;
	struct cpu_key key;
	INITIALIZE_PATH(path);
	int pos_in_item;
	int jbegin_count = JOURNAL_PER_BALANCE_CNT;
2182
	loff_t byte_offset = ((loff_t)block << inode->i_sb->s_blocksize_bits)+1;
2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215
	int retval;
	int use_get_block = 0;
	int bytes_copied = 0;
	int copy_size;
	int trans_running = 0;

	/* catch places below that try to log something without starting a trans */
	th.t_trans_id = 0;

	if (!buffer_uptodate(bh_result)) {
		return -EIO;
	}

	kmap(bh_result->b_page);
      start_over:
	reiserfs_write_lock(inode->i_sb);
	make_cpu_key(&key, inode, byte_offset, TYPE_ANY, 3);

      research:
	retval = search_for_position_by_key(inode->i_sb, &key, &path);
	if (retval != POSITION_FOUND) {
		use_get_block = 1;
		goto out;
	}

	bh = get_last_bh(&path);
	ih = get_ih(&path);
	item = get_item(&path);
	pos_in_item = path.pos_in_item;

	/* we've found an unformatted node */
	if (indirect_item_found(retval, ih)) {
		if (bytes_copied > 0) {
J
Jeff Mahoney 已提交
2216 2217
			reiserfs_warning(inode->i_sb, "clm-6002",
					 "bytes_copied %d", bytes_copied);
2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273
		}
		if (!get_block_num(item, pos_in_item)) {
			/* crap, we are writing to a hole */
			use_get_block = 1;
			goto out;
		}
		set_block_dev_mapped(bh_result,
				     get_block_num(item, pos_in_item), inode);
	} else if (is_direct_le_ih(ih)) {
		char *p;
		p = page_address(bh_result->b_page);
		p += (byte_offset - 1) & (PAGE_CACHE_SIZE - 1);
		copy_size = ih_item_len(ih) - pos_in_item;

		fs_gen = get_generation(inode->i_sb);
		copy_item_head(&tmp_ih, ih);

		if (!trans_running) {
			/* vs-3050 is gone, no need to drop the path */
			retval = journal_begin(&th, inode->i_sb, jbegin_count);
			if (retval)
				goto out;
			reiserfs_update_inode_transaction(inode);
			trans_running = 1;
			if (fs_changed(fs_gen, inode->i_sb)
			    && item_moved(&tmp_ih, &path)) {
				reiserfs_restore_prepared_buffer(inode->i_sb,
								 bh);
				goto research;
			}
		}

		reiserfs_prepare_for_journal(inode->i_sb, bh, 1);

		if (fs_changed(fs_gen, inode->i_sb)
		    && item_moved(&tmp_ih, &path)) {
			reiserfs_restore_prepared_buffer(inode->i_sb, bh);
			goto research;
		}

		memcpy(B_I_PITEM(bh, ih) + pos_in_item, p + bytes_copied,
		       copy_size);

		journal_mark_dirty(&th, inode->i_sb, bh);
		bytes_copied += copy_size;
		set_block_dev_mapped(bh_result, 0, inode);

		/* are there still bytes left? */
		if (bytes_copied < bh_result->b_size &&
		    (byte_offset + bytes_copied) < inode->i_size) {
			set_cpu_key_k_offset(&key,
					     cpu_key_k_offset(&key) +
					     copy_size);
			goto research;
		}
	} else {
J
Jeff Mahoney 已提交
2274 2275
		reiserfs_warning(inode->i_sb, "clm-6003",
				 "bad item inode %lu", inode->i_ino);
2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293
		retval = -EIO;
		goto out;
	}
	retval = 0;

      out:
	pathrelse(&path);
	if (trans_running) {
		int err = journal_end(&th, inode->i_sb, jbegin_count);
		if (err)
			retval = err;
		trans_running = 0;
	}
	reiserfs_write_unlock(inode->i_sb);

	/* this is where we fill in holes in the file. */
	if (use_get_block) {
		retval = reiserfs_get_block(inode, block, bh_result,
2294
					    GET_BLOCK_CREATE | GET_BLOCK_NO_IMUX
2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315
					    | GET_BLOCK_NO_DANGLE);
		if (!retval) {
			if (!buffer_mapped(bh_result)
			    || bh_result->b_blocknr == 0) {
				/* get_block failed to find a mapped unformatted node. */
				use_get_block = 0;
				goto start_over;
			}
		}
	}
	kunmap(bh_result->b_page);

	if (!retval && buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
		/* we've copied data from the page into the direct item, so the
		 * buffer in the page is now clean, mark it to reflect that.
		 */
		lock_buffer(bh_result);
		clear_buffer_dirty(bh_result);
		unlock_buffer(bh_result);
	}
	return retval;
L
Linus Torvalds 已提交
2316 2317
}

2318 2319
/*
 * mason@suse.com: updated in 2.5.54 to follow the same general io
L
Linus Torvalds 已提交
2320 2321 2322
 * start/recovery path as __block_write_full_page, along with special
 * code to handle reiserfs tails.
 */
2323 2324 2325 2326 2327 2328 2329
static int reiserfs_write_full_page(struct page *page,
				    struct writeback_control *wbc)
{
	struct inode *inode = page->mapping->host;
	unsigned long end_index = inode->i_size >> PAGE_CACHE_SHIFT;
	int error = 0;
	unsigned long block;
2330
	sector_t last_block;
2331 2332 2333 2334 2335 2336 2337 2338 2339
	struct buffer_head *head, *bh;
	int partial = 0;
	int nr = 0;
	int checked = PageChecked(page);
	struct reiserfs_transaction_handle th;
	struct super_block *s = inode->i_sb;
	int bh_per_page = PAGE_CACHE_SIZE / s->s_blocksize;
	th.t_trans_id = 0;

2340 2341 2342 2343 2344 2345 2346
	/* no logging allowed when nonblocking or from PF_MEMALLOC */
	if (checked && (current->flags & PF_MEMALLOC)) {
		redirty_page_for_writepage(wbc, page);
		unlock_page(page);
		return 0;
	}

2347 2348 2349 2350 2351 2352 2353 2354 2355 2356
	/* The page dirty bit is cleared before writepage is called, which
	 * means we have to tell create_empty_buffers to make dirty buffers
	 * The page really should be up to date at this point, so tossing
	 * in the BH_Uptodate is just a sanity check.
	 */
	if (!page_has_buffers(page)) {
		create_empty_buffers(page, s->s_blocksize,
				     (1 << BH_Dirty) | (1 << BH_Uptodate));
	}
	head = page_buffers(page);
L
Linus Torvalds 已提交
2357

2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369
	/* last page in the file, zero out any contents past the
	 ** last byte in the file
	 */
	if (page->index >= end_index) {
		unsigned last_offset;

		last_offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
		/* no file contents in this page */
		if (page->index >= end_index + 1 || !last_offset) {
			unlock_page(page);
			return 0;
		}
2370
		zero_user_segment(page, last_offset, PAGE_CACHE_SIZE);
L
Linus Torvalds 已提交
2371
	}
2372 2373
	bh = head;
	block = page->index << (PAGE_CACHE_SHIFT - s->s_blocksize_bits);
2374
	last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
2375 2376
	/* first map all the buffers, logging any direct items we find */
	do {
2377 2378 2379 2380 2381 2382 2383 2384 2385 2386
		if (block > last_block) {
			/*
			 * This can happen when the block size is less than
			 * the page size.  The corresponding bytes in the page
			 * were zero filled above
			 */
			clear_buffer_dirty(bh);
			set_buffer_uptodate(bh);
		} else if ((checked || buffer_dirty(bh)) &&
		           (!buffer_mapped(bh) || (buffer_mapped(bh)
2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405
						       && bh->b_blocknr ==
						       0))) {
			/* not mapped yet, or it points to a direct item, search
			 * the btree for the mapping info, and log any direct
			 * items found
			 */
			if ((error = map_block_for_writepage(inode, bh, block))) {
				goto fail;
			}
		}
		bh = bh->b_this_page;
		block++;
	} while (bh != head);

	/*
	 * we start the transaction after map_block_for_writepage,
	 * because it can create holes in the file (an unbounded operation).
	 * starting it here, we can make a reliable estimate for how many
	 * blocks we're going to log
L
Linus Torvalds 已提交
2406
	 */
2407 2408 2409 2410 2411 2412 2413 2414 2415
	if (checked) {
		ClearPageChecked(page);
		reiserfs_write_lock(s);
		error = journal_begin(&th, s, bh_per_page + 1);
		if (error) {
			reiserfs_write_unlock(s);
			goto fail;
		}
		reiserfs_update_inode_transaction(inode);
L
Linus Torvalds 已提交
2416
	}
2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435
	/* now go through and lock any dirty buffers on the page */
	do {
		get_bh(bh);
		if (!buffer_mapped(bh))
			continue;
		if (buffer_mapped(bh) && bh->b_blocknr == 0)
			continue;

		if (checked) {
			reiserfs_prepare_for_journal(s, bh, 1);
			journal_mark_dirty(&th, s, bh);
			continue;
		}
		/* from this point on, we know the buffer is mapped to a
		 * real block and not a direct item
		 */
		if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) {
			lock_buffer(bh);
		} else {
N
Nick Piggin 已提交
2436
			if (!trylock_buffer(bh)) {
2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452
				redirty_page_for_writepage(wbc, page);
				continue;
			}
		}
		if (test_clear_buffer_dirty(bh)) {
			mark_buffer_async_write(bh);
		} else {
			unlock_buffer(bh);
		}
	} while ((bh = bh->b_this_page) != head);

	if (checked) {
		error = journal_end(&th, s, bh_per_page + 1);
		reiserfs_write_unlock(s);
		if (error)
			goto fail;
L
Linus Torvalds 已提交
2453
	}
2454 2455 2456
	BUG_ON(PageWriteback(page));
	set_page_writeback(page);
	unlock_page(page);
L
Linus Torvalds 已提交
2457

2458
	/*
2459
	 * since any buffer might be the only dirty buffer on the page,
2460 2461
	 * the first submit_bh can bring the page out of writeback.
	 * be careful with the buffers.
L
Linus Torvalds 已提交
2462 2463
	 */
	do {
2464 2465 2466 2467 2468 2469 2470 2471
		struct buffer_head *next = bh->b_this_page;
		if (buffer_async_write(bh)) {
			submit_bh(WRITE, bh);
			nr++;
		}
		put_bh(bh);
		bh = next;
	} while (bh != head);
L
Linus Torvalds 已提交
2472

2473 2474 2475 2476 2477
	error = 0;
      done:
	if (nr == 0) {
		/*
		 * if this page only had a direct item, it is very possible for
2478 2479
		 * no io to be required without there being an error.  Or,
		 * someone else could have locked them and sent them down the
2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494
		 * pipe without locking the page
		 */
		bh = head;
		do {
			if (!buffer_uptodate(bh)) {
				partial = 1;
				break;
			}
			bh = bh->b_this_page;
		} while (bh != head);
		if (!partial)
			SetPageUptodate(page);
		end_page_writeback(page);
	}
	return error;
L
Linus Torvalds 已提交
2495

2496 2497
      fail:
	/* catches various errors, we need to make sure any valid dirty blocks
2498
	 * get to the media.  The page is currently locked and not marked for
2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531
	 * writeback
	 */
	ClearPageUptodate(page);
	bh = head;
	do {
		get_bh(bh);
		if (buffer_mapped(bh) && buffer_dirty(bh) && bh->b_blocknr) {
			lock_buffer(bh);
			mark_buffer_async_write(bh);
		} else {
			/*
			 * clear any dirty bits that might have come from getting
			 * attached to a dirty page
			 */
			clear_buffer_dirty(bh);
		}
		bh = bh->b_this_page;
	} while (bh != head);
	SetPageError(page);
	BUG_ON(PageWriteback(page));
	set_page_writeback(page);
	unlock_page(page);
	do {
		struct buffer_head *next = bh->b_this_page;
		if (buffer_async_write(bh)) {
			clear_buffer_dirty(bh);
			submit_bh(WRITE, bh);
			nr++;
		}
		put_bh(bh);
		bh = next;
	} while (bh != head);
	goto done;
L
Linus Torvalds 已提交
2532 2533
}

2534 2535 2536 2537
static int reiserfs_readpage(struct file *f, struct page *page)
{
	return block_read_full_page(page, reiserfs_get_block);
}
L
Linus Torvalds 已提交
2538

2539
static int reiserfs_writepage(struct page *page, struct writeback_control *wbc)
L
Linus Torvalds 已提交
2540
{
2541 2542 2543
	struct inode *inode = page->mapping->host;
	reiserfs_wait_on_write_block(inode->i_sb);
	return reiserfs_write_full_page(page, wbc);
L
Linus Torvalds 已提交
2544 2545
}

2546 2547 2548 2549 2550 2551
static void reiserfs_truncate_failed_write(struct inode *inode)
{
	truncate_inode_pages(inode->i_mapping, inode->i_size);
	reiserfs_truncate_file(inode, 0);
}

V
Vladimir Saveliev 已提交
2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562
static int reiserfs_write_begin(struct file *file,
				struct address_space *mapping,
				loff_t pos, unsigned len, unsigned flags,
				struct page **pagep, void **fsdata)
{
	struct inode *inode;
	struct page *page;
	pgoff_t index;
	int ret;
	int old_ref = 0;

2563 2564 2565 2566 2567 2568 2569 2570
 	inode = mapping->host;
	*fsdata = 0;
 	if (flags & AOP_FLAG_CONT_EXPAND &&
 	    (pos & (inode->i_sb->s_blocksize - 1)) == 0) {
 		pos ++;
		*fsdata = (void *)(unsigned long)flags;
	}

V
Vladimir Saveliev 已提交
2571
	index = pos >> PAGE_CACHE_SHIFT;
2572
	page = grab_cache_page_write_begin(mapping, index, flags);
V
Vladimir Saveliev 已提交
2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587
	if (!page)
		return -ENOMEM;
	*pagep = page;

	reiserfs_wait_on_write_block(inode->i_sb);
	fix_tail_page_for_writing(page);
	if (reiserfs_transaction_running(inode->i_sb)) {
		struct reiserfs_transaction_handle *th;
		th = (struct reiserfs_transaction_handle *)current->
		    journal_info;
		BUG_ON(!th->t_refcount);
		BUG_ON(!th->t_trans_id);
		old_ref = th->t_refcount;
		th->t_refcount++;
	}
2588
	ret = __block_write_begin(page, pos, len, reiserfs_get_block);
V
Vladimir Saveliev 已提交
2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616
	if (ret && reiserfs_transaction_running(inode->i_sb)) {
		struct reiserfs_transaction_handle *th = current->journal_info;
		/* this gets a little ugly.  If reiserfs_get_block returned an
		 * error and left a transacstion running, we've got to close it,
		 * and we've got to free handle if it was a persistent transaction.
		 *
		 * But, if we had nested into an existing transaction, we need
		 * to just drop the ref count on the handle.
		 *
		 * If old_ref == 0, the transaction is from reiserfs_get_block,
		 * and it was a persistent trans.  Otherwise, it was nested above.
		 */
		if (th->t_refcount > old_ref) {
			if (old_ref)
				th->t_refcount--;
			else {
				int err;
				reiserfs_write_lock(inode->i_sb);
				err = reiserfs_end_persistent_transaction(th);
				reiserfs_write_unlock(inode->i_sb);
				if (err)
					ret = err;
			}
		}
	}
	if (ret) {
		unlock_page(page);
		page_cache_release(page);
2617 2618
		/* Truncate allocated blocks */
		reiserfs_truncate_failed_write(inode);
V
Vladimir Saveliev 已提交
2619 2620 2621 2622 2623 2624
	}
	return ret;
}

int reiserfs_prepare_write(struct file *f, struct page *page,
			   unsigned from, unsigned to)
2625 2626 2627 2628 2629
{
	struct inode *inode = page->mapping->host;
	int ret;
	int old_ref = 0;

F
Frederic Weisbecker 已提交
2630
	reiserfs_write_unlock(inode->i_sb);
2631
	reiserfs_wait_on_write_block(inode->i_sb);
F
Frederic Weisbecker 已提交
2632 2633
	reiserfs_write_lock(inode->i_sb);

2634 2635 2636 2637 2638 2639 2640 2641 2642
	fix_tail_page_for_writing(page);
	if (reiserfs_transaction_running(inode->i_sb)) {
		struct reiserfs_transaction_handle *th;
		th = (struct reiserfs_transaction_handle *)current->
		    journal_info;
		BUG_ON(!th->t_refcount);
		BUG_ON(!th->t_trans_id);
		old_ref = th->t_refcount;
		th->t_refcount++;
L
Linus Torvalds 已提交
2643 2644
	}

2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671
	ret = block_prepare_write(page, from, to, reiserfs_get_block);
	if (ret && reiserfs_transaction_running(inode->i_sb)) {
		struct reiserfs_transaction_handle *th = current->journal_info;
		/* this gets a little ugly.  If reiserfs_get_block returned an
		 * error and left a transacstion running, we've got to close it,
		 * and we've got to free handle if it was a persistent transaction.
		 *
		 * But, if we had nested into an existing transaction, we need
		 * to just drop the ref count on the handle.
		 *
		 * If old_ref == 0, the transaction is from reiserfs_get_block,
		 * and it was a persistent trans.  Otherwise, it was nested above.
		 */
		if (th->t_refcount > old_ref) {
			if (old_ref)
				th->t_refcount--;
			else {
				int err;
				reiserfs_write_lock(inode->i_sb);
				err = reiserfs_end_persistent_transaction(th);
				reiserfs_write_unlock(inode->i_sb);
				if (err)
					ret = err;
			}
		}
	}
	return ret;
L
Linus Torvalds 已提交
2672

2673
}
L
Linus Torvalds 已提交
2674

2675 2676 2677
static sector_t reiserfs_aop_bmap(struct address_space *as, sector_t block)
{
	return generic_block_bmap(as, block, reiserfs_bmap);
L
Linus Torvalds 已提交
2678 2679
}

V
Vladimir Saveliev 已提交
2680 2681 2682 2683 2684 2685 2686 2687 2688
static int reiserfs_write_end(struct file *file, struct address_space *mapping,
			      loff_t pos, unsigned len, unsigned copied,
			      struct page *page, void *fsdata)
{
	struct inode *inode = page->mapping->host;
	int ret = 0;
	int update_sd = 0;
	struct reiserfs_transaction_handle *th;
	unsigned start;
2689 2690
	int lock_depth = 0;
	bool locked = false;
V
Vladimir Saveliev 已提交
2691

2692 2693
	if ((unsigned long)fsdata & AOP_FLAG_CONT_EXPAND)
		pos ++;
V
Vladimir Saveliev 已提交
2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715

	reiserfs_wait_on_write_block(inode->i_sb);
	if (reiserfs_transaction_running(inode->i_sb))
		th = current->journal_info;
	else
		th = NULL;

	start = pos & (PAGE_CACHE_SIZE - 1);
	if (unlikely(copied < len)) {
		if (!PageUptodate(page))
			copied = 0;

		page_zero_new_buffers(page, start + copied, start + len);
	}
	flush_dcache_page(page);

	reiserfs_commit_page(inode, page, start, start + copied);

	/* generic_commit_write does this for us, but does not update the
	 ** transaction tracking stuff when the size changes.  So, we have
	 ** to do the i_size updates here.
	 */
2716
	if (pos + copied > inode->i_size) {
V
Vladimir Saveliev 已提交
2717
		struct reiserfs_transaction_handle myth;
2718 2719
		lock_depth = reiserfs_write_lock_once(inode->i_sb);
		locked = true;
V
Vladimir Saveliev 已提交
2720 2721 2722 2723 2724 2725 2726 2727 2728 2729
		/* If the file have grown beyond the border where it
		   can have a tail, unmark it as needing a tail
		   packing */
		if ((have_large_tails(inode->i_sb)
		     && inode->i_size > i_block_size(inode) * 4)
		    || (have_small_tails(inode->i_sb)
			&& inode->i_size > i_block_size(inode)))
			REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;

		ret = journal_begin(&myth, inode->i_sb, 1);
2730
		if (ret)
V
Vladimir Saveliev 已提交
2731
			goto journal_error;
2732

V
Vladimir Saveliev 已提交
2733
		reiserfs_update_inode_transaction(inode);
2734
		inode->i_size = pos + copied;
V
Vladimir Saveliev 已提交
2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747
		/*
		 * this will just nest into our transaction.  It's important
		 * to use mark_inode_dirty so the inode gets pushed around on the
		 * dirty lists, and so that O_SYNC works as expected
		 */
		mark_inode_dirty(inode);
		reiserfs_update_sd(&myth, inode);
		update_sd = 1;
		ret = journal_end(&myth, inode->i_sb, 1);
		if (ret)
			goto journal_error;
	}
	if (th) {
2748 2749 2750 2751
		if (!locked) {
			lock_depth = reiserfs_write_lock_once(inode->i_sb);
			locked = true;
		}
V
Vladimir Saveliev 已提交
2752 2753 2754 2755 2756 2757 2758 2759
		if (!update_sd)
			mark_inode_dirty(inode);
		ret = reiserfs_end_persistent_transaction(th);
		if (ret)
			goto out;
	}

      out:
2760 2761
	if (locked)
		reiserfs_write_unlock_once(inode->i_sb, lock_depth);
V
Vladimir Saveliev 已提交
2762 2763
	unlock_page(page);
	page_cache_release(page);
2764 2765 2766 2767

	if (pos + len > inode->i_size)
		reiserfs_truncate_failed_write(inode);

V
Vladimir Saveliev 已提交
2768 2769 2770
	return ret == 0 ? copied : ret;

      journal_error:
2771 2772
	reiserfs_write_unlock_once(inode->i_sb, lock_depth);
	locked = false;
V
Vladimir Saveliev 已提交
2773 2774 2775 2776 2777 2778 2779 2780 2781 2782
	if (th) {
		if (!update_sd)
			reiserfs_update_sd(th, inode);
		ret = reiserfs_end_persistent_transaction(th);
	}
	goto out;
}

int reiserfs_commit_write(struct file *f, struct page *page,
			  unsigned from, unsigned to)
2783 2784 2785 2786 2787 2788 2789
{
	struct inode *inode = page->mapping->host;
	loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + to;
	int ret = 0;
	int update_sd = 0;
	struct reiserfs_transaction_handle *th = NULL;

F
Frederic Weisbecker 已提交
2790
	reiserfs_write_unlock(inode->i_sb);
2791
	reiserfs_wait_on_write_block(inode->i_sb);
F
Frederic Weisbecker 已提交
2792 2793
	reiserfs_write_lock(inode->i_sb);

2794 2795 2796 2797
	if (reiserfs_transaction_running(inode->i_sb)) {
		th = current->journal_info;
	}
	reiserfs_commit_page(inode, page, from, to);
L
Linus Torvalds 已提交
2798

2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814
	/* generic_commit_write does this for us, but does not update the
	 ** transaction tracking stuff when the size changes.  So, we have
	 ** to do the i_size updates here.
	 */
	if (pos > inode->i_size) {
		struct reiserfs_transaction_handle myth;
		/* If the file have grown beyond the border where it
		   can have a tail, unmark it as needing a tail
		   packing */
		if ((have_large_tails(inode->i_sb)
		     && inode->i_size > i_block_size(inode) * 4)
		    || (have_small_tails(inode->i_sb)
			&& inode->i_size > i_block_size(inode)))
			REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;

		ret = journal_begin(&myth, inode->i_sb, 1);
2815
		if (ret)
2816
			goto journal_error;
2817

2818 2819
		reiserfs_update_inode_transaction(inode);
		inode->i_size = pos;
2820 2821 2822 2823 2824 2825
		/*
		 * this will just nest into our transaction.  It's important
		 * to use mark_inode_dirty so the inode gets pushed around on the
		 * dirty lists, and so that O_SYNC works as expected
		 */
		mark_inode_dirty(inode);
2826 2827 2828 2829 2830 2831 2832 2833
		reiserfs_update_sd(&myth, inode);
		update_sd = 1;
		ret = journal_end(&myth, inode->i_sb, 1);
		if (ret)
			goto journal_error;
	}
	if (th) {
		if (!update_sd)
2834
			mark_inode_dirty(inode);
2835 2836 2837 2838 2839 2840 2841
		ret = reiserfs_end_persistent_transaction(th);
		if (ret)
			goto out;
	}

      out:
	return ret;
L
Linus Torvalds 已提交
2842

2843 2844 2845 2846 2847 2848 2849 2850
      journal_error:
	if (th) {
		if (!update_sd)
			reiserfs_update_sd(th, inode);
		ret = reiserfs_end_persistent_transaction(th);
	}

	return ret;
L
Linus Torvalds 已提交
2851 2852
}

2853
void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode)
L
Linus Torvalds 已提交
2854
{
2855 2856 2857
	if (reiserfs_attrs(inode->i_sb)) {
		if (sd_attrs & REISERFS_SYNC_FL)
			inode->i_flags |= S_SYNC;
L
Linus Torvalds 已提交
2858
		else
2859 2860 2861
			inode->i_flags &= ~S_SYNC;
		if (sd_attrs & REISERFS_IMMUTABLE_FL)
			inode->i_flags |= S_IMMUTABLE;
L
Linus Torvalds 已提交
2862
		else
2863 2864 2865
			inode->i_flags &= ~S_IMMUTABLE;
		if (sd_attrs & REISERFS_APPEND_FL)
			inode->i_flags |= S_APPEND;
L
Linus Torvalds 已提交
2866
		else
2867 2868 2869
			inode->i_flags &= ~S_APPEND;
		if (sd_attrs & REISERFS_NOATIME_FL)
			inode->i_flags |= S_NOATIME;
L
Linus Torvalds 已提交
2870
		else
2871 2872
			inode->i_flags &= ~S_NOATIME;
		if (sd_attrs & REISERFS_NOTAIL_FL)
L
Linus Torvalds 已提交
2873 2874 2875 2876 2877 2878
			REISERFS_I(inode)->i_flags |= i_nopack_mask;
		else
			REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
	}
}

2879
void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs)
L
Linus Torvalds 已提交
2880
{
2881 2882
	if (reiserfs_attrs(inode->i_sb)) {
		if (inode->i_flags & S_IMMUTABLE)
L
Linus Torvalds 已提交
2883 2884 2885
			*sd_attrs |= REISERFS_IMMUTABLE_FL;
		else
			*sd_attrs &= ~REISERFS_IMMUTABLE_FL;
2886
		if (inode->i_flags & S_SYNC)
L
Linus Torvalds 已提交
2887 2888 2889
			*sd_attrs |= REISERFS_SYNC_FL;
		else
			*sd_attrs &= ~REISERFS_SYNC_FL;
2890
		if (inode->i_flags & S_NOATIME)
L
Linus Torvalds 已提交
2891 2892 2893
			*sd_attrs |= REISERFS_NOATIME_FL;
		else
			*sd_attrs &= ~REISERFS_NOATIME_FL;
2894
		if (REISERFS_I(inode)->i_flags & i_nopack_mask)
L
Linus Torvalds 已提交
2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905
			*sd_attrs |= REISERFS_NOTAIL_FL;
		else
			*sd_attrs &= ~REISERFS_NOTAIL_FL;
	}
}

/* decide if this buffer needs to stay around for data logging or ordered
** write purposes
*/
static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh)
{
2906 2907 2908
	int ret = 1;
	struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);

2909
	lock_buffer(bh);
2910 2911 2912 2913 2914 2915
	spin_lock(&j->j_dirty_buffers_lock);
	if (!buffer_mapped(bh)) {
		goto free_jh;
	}
	/* the page is locked, and the only places that log a data buffer
	 * also lock the page.
L
Linus Torvalds 已提交
2916
	 */
2917 2918 2919 2920 2921 2922 2923 2924
	if (reiserfs_file_data_log(inode)) {
		/*
		 * very conservative, leave the buffer pinned if
		 * anyone might need it.
		 */
		if (buffer_journaled(bh) || buffer_journal_dirty(bh)) {
			ret = 0;
		}
2925
	} else  if (buffer_dirty(bh)) {
2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950
		struct reiserfs_journal_list *jl;
		struct reiserfs_jh *jh = bh->b_private;

		/* why is this safe?
		 * reiserfs_setattr updates i_size in the on disk
		 * stat data before allowing vmtruncate to be called.
		 *
		 * If buffer was put onto the ordered list for this
		 * transaction, we know for sure either this transaction
		 * or an older one already has updated i_size on disk,
		 * and this ordered data won't be referenced in the file
		 * if we crash.
		 *
		 * if the buffer was put onto the ordered list for an older
		 * transaction, we need to leave it around
		 */
		if (jh && (jl = jh->jl)
		    && jl != SB_JOURNAL(inode->i_sb)->j_current_jl)
			ret = 0;
	}
      free_jh:
	if (ret && bh->b_private) {
		reiserfs_free_jh(bh);
	}
	spin_unlock(&j->j_dirty_buffers_lock);
2951
	unlock_buffer(bh);
2952
	return ret;
L
Linus Torvalds 已提交
2953 2954 2955
}

/* clm -- taken from fs/buffer.c:block_invalidate_page */
2956
static void reiserfs_invalidatepage(struct page *page, unsigned long offset)
L
Linus Torvalds 已提交
2957
{
2958 2959 2960 2961
	struct buffer_head *head, *bh, *next;
	struct inode *inode = page->mapping->host;
	unsigned int curr_off = 0;
	int ret = 1;
L
Linus Torvalds 已提交
2962

2963
	BUG_ON(!PageLocked(page));
L
Linus Torvalds 已提交
2964

2965 2966
	if (offset == 0)
		ClearPageChecked(page);
L
Linus Torvalds 已提交
2967

2968 2969 2970 2971 2972 2973 2974 2975
	if (!page_has_buffers(page))
		goto out;

	head = page_buffers(page);
	bh = head;
	do {
		unsigned int next_off = curr_off + bh->b_size;
		next = bh->b_this_page;
L
Linus Torvalds 已提交
2976

2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988
		/*
		 * is this block fully invalidated?
		 */
		if (offset <= curr_off) {
			if (invalidatepage_can_drop(inode, bh))
				reiserfs_unmap_buffer(bh);
			else
				ret = 0;
		}
		curr_off = next_off;
		bh = next;
	} while (bh != head);
L
Linus Torvalds 已提交
2989 2990

	/*
2991 2992 2993
	 * We release buffers only if the entire page is being invalidated.
	 * The get_block cached value has been unconditionally invalidated,
	 * so real IO is not possible anymore.
L
Linus Torvalds 已提交
2994
	 */
2995
	if (!offset && ret) {
2996
		ret = try_to_release_page(page, 0);
2997 2998
		/* maybe should BUG_ON(!ret); - neilb */
	}
2999
      out:
3000
	return;
L
Linus Torvalds 已提交
3001 3002
}

3003 3004 3005 3006 3007 3008 3009 3010
static int reiserfs_set_page_dirty(struct page *page)
{
	struct inode *inode = page->mapping->host;
	if (reiserfs_file_data_log(inode)) {
		SetPageChecked(page);
		return __set_page_dirty_nobuffers(page);
	}
	return __set_page_dirty_buffers(page);
L
Linus Torvalds 已提交
3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021
}

/*
 * Returns 1 if the page's buffers were dropped.  The page is locked.
 *
 * Takes j_dirty_buffers_lock to protect the b_assoc_buffers list_heads
 * in the buffers at page_buffers(page).
 *
 * even in -o notail mode, we can't be sure an old mount without -o notail
 * didn't create files with tails.
 */
A
Al Viro 已提交
3022
static int reiserfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
L
Linus Torvalds 已提交
3023
{
3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048
	struct inode *inode = page->mapping->host;
	struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
	struct buffer_head *head;
	struct buffer_head *bh;
	int ret = 1;

	WARN_ON(PageChecked(page));
	spin_lock(&j->j_dirty_buffers_lock);
	head = page_buffers(page);
	bh = head;
	do {
		if (bh->b_private) {
			if (!buffer_dirty(bh) && !buffer_locked(bh)) {
				reiserfs_free_jh(bh);
			} else {
				ret = 0;
				break;
			}
		}
		bh = bh->b_this_page;
	} while (bh != head);
	if (ret)
		ret = try_to_free_buffers(page);
	spin_unlock(&j->j_dirty_buffers_lock);
	return ret;
L
Linus Torvalds 已提交
3049 3050 3051 3052 3053
}

/* We thank Mingming Cao for helping us understand in great detail what
   to do in this section of the code. */
static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb,
3054 3055
				  const struct iovec *iov, loff_t offset,
				  unsigned long nr_segs)
L
Linus Torvalds 已提交
3056
{
3057 3058
	struct file *file = iocb->ki_filp;
	struct inode *inode = file->f_mapping->host;
3059
	ssize_t ret;
L
Linus Torvalds 已提交
3060

3061
	ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
3062 3063
				  offset, nr_segs,
				  reiserfs_get_blocks_direct_io, NULL);
3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077

	/*
	 * In case of error extending write may have instantiated a few
	 * blocks outside i_size. Trim these off again.
	 */
	if (unlikely((rw & WRITE) && ret < 0)) {
		loff_t isize = i_size_read(inode);
		loff_t end = offset + iov_length(iov, nr_segs);

		if (end > isize)
			vmtruncate(inode, isize);
	}

	return ret;
L
Linus Torvalds 已提交
3078 3079
}

3080 3081 3082
int reiserfs_setattr(struct dentry *dentry, struct iattr *attr)
{
	struct inode *inode = dentry->d_inode;
3083
	unsigned int ia_valid;
3084 3085
	int depth;
	int error;
3086 3087 3088 3089

	/* must be turned off for recursive notify_change calls */
	ia_valid = attr->ia_valid &= ~(ATTR_KILL_SUID|ATTR_KILL_SGID);

3090
	depth = reiserfs_write_lock_once(inode->i_sb);
3091
	if (is_quota_modification(inode, attr))
3092
		dquot_initialize(inode);
3093

3094
	if (attr->ia_valid & ATTR_SIZE) {
3095 3096 3097 3098 3099 3100 3101 3102 3103 3104
		/* version 2 items will be caught by the s_maxbytes check
		 ** done for us in vmtruncate
		 */
		if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 &&
		    attr->ia_size > MAX_NON_LFS) {
			error = -EFBIG;
			goto out;
		}
		/* fill in hole pointers in the expanding truncate case. */
		if (attr->ia_size > inode->i_size) {
3105
			error = generic_cont_expand_simple(inode, attr->ia_size);
3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119
			if (REISERFS_I(inode)->i_prealloc_count > 0) {
				int err;
				struct reiserfs_transaction_handle th;
				/* we're changing at most 2 bitmaps, inode + super */
				err = journal_begin(&th, inode->i_sb, 4);
				if (!err) {
					reiserfs_discard_prealloc(&th, inode);
					err = journal_end(&th, inode->i_sb, 4);
				}
				if (err)
					error = err;
			}
			if (error)
				goto out;
3120 3121 3122 3123 3124
			/*
			 * file size is changed, ctime and mtime are
			 * to be updated
			 */
			attr->ia_valid |= (ATTR_MTIME | ATTR_CTIME);
L
Linus Torvalds 已提交
3125 3126 3127
		}
	}

3128 3129 3130
	if ((((attr->ia_valid & ATTR_UID) && (attr->ia_uid & ~0xffff)) ||
	     ((attr->ia_valid & ATTR_GID) && (attr->ia_gid & ~0xffff))) &&
	    (get_inode_sd_version(inode) == STAT_DATA_V1)) {
L
Linus Torvalds 已提交
3131
		/* stat data of format v3.5 has 16 bit uid and gid */
3132 3133 3134
		error = -EINVAL;
		goto out;
	}
L
Linus Torvalds 已提交
3135

3136
	error = inode_change_ok(inode, attr);
C
Christoph Hellwig 已提交
3137 3138
	if (error)
		goto out;
3139

C
Christoph Hellwig 已提交
3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161
	if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
	    (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
		struct reiserfs_transaction_handle th;
		int jbegin_count =
		    2 *
		    (REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb) +
		     REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb)) +
		    2;

		error = reiserfs_chown_xattrs(inode, attr);

		if (error)
			return error;

		/* (user+group)*(old+new) structure - we count quota info and , inode write (sb, inode) */
		error = journal_begin(&th, inode->i_sb, jbegin_count);
		if (error)
			goto out;
		error = dquot_transfer(inode, attr);
		if (error) {
			journal_end(&th, inode->i_sb, jbegin_count);
			goto out;
3162
		}
C
Christoph Hellwig 已提交
3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173

		/* Update corresponding info in inode so that everything is in
		 * one transaction */
		if (attr->ia_valid & ATTR_UID)
			inode->i_uid = attr->ia_uid;
		if (attr->ia_valid & ATTR_GID)
			inode->i_gid = attr->ia_gid;
		mark_inode_dirty(inode);
		error = journal_end(&th, inode->i_sb, jbegin_count);
		if (error)
			goto out;
3174
	}
L
Linus Torvalds 已提交
3175

C
Christoph Hellwig 已提交
3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192
	/*
	 * Relax the lock here, as it might truncate the
	 * inode pages and wait for inode pages locks.
	 * To release such page lock, the owner needs the
	 * reiserfs lock
	 */
	reiserfs_write_unlock_once(inode->i_sb, depth);
	if ((attr->ia_valid & ATTR_SIZE) &&
	    attr->ia_size != i_size_read(inode))
		error = vmtruncate(inode, attr->ia_size);

	if (!error) {
		setattr_copy(inode, attr);
		mark_inode_dirty(inode);
	}
	depth = reiserfs_write_lock_once(inode->i_sb);

3193 3194 3195 3196
	if (!error && reiserfs_posixacl(inode->i_sb)) {
		if (attr->ia_valid & ATTR_MODE)
			error = reiserfs_acl_chmod(inode);
	}
L
Linus Torvalds 已提交
3197

3198
      out:
3199 3200
	reiserfs_write_unlock_once(inode->i_sb, depth);

3201
	return error;
L
Linus Torvalds 已提交
3202 3203
}

3204
const struct address_space_operations reiserfs_address_space_operations = {
3205 3206 3207 3208 3209 3210
	.writepage = reiserfs_writepage,
	.readpage = reiserfs_readpage,
	.readpages = reiserfs_readpages,
	.releasepage = reiserfs_releasepage,
	.invalidatepage = reiserfs_invalidatepage,
	.sync_page = block_sync_page,
V
Vladimir Saveliev 已提交
3211 3212
	.write_begin = reiserfs_write_begin,
	.write_end = reiserfs_write_end,
3213 3214 3215 3216
	.bmap = reiserfs_aop_bmap,
	.direct_IO = reiserfs_direct_IO,
	.set_page_dirty = reiserfs_set_page_dirty,
};