644 lines
15 KiB
C
644 lines
15 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/pagemap.h>
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#include <linux/mpage.h>
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#include <linux/fs.h>
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#include <asm/semaphore.h>
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#include "gfs2.h"
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#include "bmap.h"
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#include "glock.h"
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#include "inode.h"
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#include "log.h"
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#include "meta_io.h"
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#include "ops_address.h"
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#include "page.h"
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#include "quota.h"
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#include "trans.h"
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#include "rgrp.h"
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#include "ops_file.h"
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/**
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* gfs2_get_block - Fills in a buffer head with details about a block
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* @inode: The inode
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* @lblock: The block number to look up
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* @bh_result: The buffer head to return the result in
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* @create: Non-zero if we may add block to the file
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*
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* Returns: errno
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*/
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int gfs2_get_block(struct inode *inode, sector_t lblock,
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struct buffer_head *bh_result, int create)
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{
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struct gfs2_inode *ip = get_v2ip(inode);
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int new = create;
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uint64_t dblock;
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int error;
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error = gfs2_block_map(ip, lblock, &new, &dblock, NULL);
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if (error)
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return error;
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if (!dblock)
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return 0;
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map_bh(bh_result, inode->i_sb, dblock);
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if (new)
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set_buffer_new(bh_result);
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return 0;
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}
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/**
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* get_block_noalloc - Fills in a buffer head with details about a block
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* @inode: The inode
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* @lblock: The block number to look up
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* @bh_result: The buffer head to return the result in
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* @create: Non-zero if we may add block to the file
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*
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* Returns: errno
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*/
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static int get_block_noalloc(struct inode *inode, sector_t lblock,
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struct buffer_head *bh_result, int create)
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{
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struct gfs2_inode *ip = get_v2ip(inode);
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int new = 0;
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uint64_t dblock;
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int error;
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error = gfs2_block_map(ip, lblock, &new, &dblock, NULL);
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if (error)
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return error;
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if (dblock)
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map_bh(bh_result, inode->i_sb, dblock);
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else if (gfs2_assert_withdraw(ip->i_sbd, !create))
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error = -EIO;
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return error;
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}
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static int get_blocks(struct inode *inode, sector_t lblock,
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unsigned long max_blocks, struct buffer_head *bh_result,
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int create)
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{
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struct gfs2_inode *ip = get_v2ip(inode);
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int new = create;
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uint64_t dblock;
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uint32_t extlen;
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int error;
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error = gfs2_block_map(ip, lblock, &new, &dblock, &extlen);
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if (error)
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return error;
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if (!dblock)
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return 0;
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map_bh(bh_result, inode->i_sb, dblock);
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if (new)
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set_buffer_new(bh_result);
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if (extlen > max_blocks)
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extlen = max_blocks;
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bh_result->b_size = extlen << inode->i_blkbits;
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return 0;
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}
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static int get_blocks_noalloc(struct inode *inode, sector_t lblock,
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unsigned long max_blocks,
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struct buffer_head *bh_result, int create)
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{
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struct gfs2_inode *ip = get_v2ip(inode);
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int new = 0;
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uint64_t dblock;
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uint32_t extlen;
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int error;
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error = gfs2_block_map(ip, lblock, &new, &dblock, &extlen);
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if (error)
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return error;
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if (dblock) {
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map_bh(bh_result, inode->i_sb, dblock);
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if (extlen > max_blocks)
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extlen = max_blocks;
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bh_result->b_size = extlen << inode->i_blkbits;
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} else if (gfs2_assert_withdraw(ip->i_sbd, !create))
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error = -EIO;
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return error;
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}
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/**
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* gfs2_writepage - Write complete page
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* @page: Page to write
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*
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* Returns: errno
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*
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* Some of this is copied from block_write_full_page() although we still
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* call it to do most of the work.
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*/
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static int gfs2_writepage(struct page *page, struct writeback_control *wbc)
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{
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struct inode *inode = page->mapping->host;
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struct gfs2_inode *ip = get_v2ip(page->mapping->host);
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struct gfs2_sbd *sdp = ip->i_sbd;
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loff_t i_size = i_size_read(inode);
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pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
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unsigned offset;
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int error;
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int done_trans = 0;
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atomic_inc(&sdp->sd_ops_address);
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if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) {
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unlock_page(page);
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return -EIO;
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}
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if (get_transaction)
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goto out_ignore;
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/* Is the page fully outside i_size? (truncate in progress) */
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offset = i_size & (PAGE_CACHE_SIZE-1);
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if (page->index >= end_index+1 || !offset) {
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page->mapping->a_ops->invalidatepage(page, 0);
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unlock_page(page);
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return 0; /* don't care */
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}
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if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) {
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error = gfs2_trans_begin(sdp, RES_DINODE + 1, 0);
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if (error)
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goto out_ignore;
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gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1);
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done_trans = 1;
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}
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error = block_write_full_page(page, get_block_noalloc, wbc);
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if (done_trans)
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gfs2_trans_end(sdp);
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gfs2_meta_cache_flush(ip);
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return error;
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out_ignore:
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redirty_page_for_writepage(wbc, page);
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unlock_page(page);
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return 0;
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}
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/**
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* stuffed_readpage - Fill in a Linux page with stuffed file data
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* @ip: the inode
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* @page: the page
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*
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* Returns: errno
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*/
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static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
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{
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struct buffer_head *dibh;
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void *kaddr;
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int error;
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error = gfs2_meta_inode_buffer(ip, &dibh);
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if (error)
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return error;
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kaddr = kmap_atomic(page, KM_USER0);
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memcpy((char *)kaddr,
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dibh->b_data + sizeof(struct gfs2_dinode),
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ip->i_di.di_size);
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memset((char *)kaddr + ip->i_di.di_size,
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0,
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PAGE_CACHE_SIZE - ip->i_di.di_size);
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kunmap_atomic(page, KM_USER0);
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brelse(dibh);
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SetPageUptodate(page);
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return 0;
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}
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static int zero_readpage(struct page *page)
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{
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void *kaddr;
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kaddr = kmap_atomic(page, KM_USER0);
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memset(kaddr, 0, PAGE_CACHE_SIZE);
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kunmap_atomic(page, KM_USER0);
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SetPageUptodate(page);
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unlock_page(page);
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return 0;
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}
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/**
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* gfs2_readpage - readpage with locking
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* @file: The file to read a page for. N.B. This may be NULL if we are
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* reading an internal file.
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* @page: The page to read
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*
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* Returns: errno
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*/
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static int gfs2_readpage(struct file *file, struct page *page)
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{
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struct gfs2_inode *ip = get_v2ip(page->mapping->host);
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struct gfs2_sbd *sdp = ip->i_sbd;
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struct gfs2_holder gh;
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int error;
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atomic_inc(&sdp->sd_ops_address);
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if (file != &gfs2_internal_file_sentinal) {
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gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh);
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error = gfs2_glock_nq_m_atime(1, &gh);
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if (error)
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goto out_unlock;
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}
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if (gfs2_is_stuffed(ip)) {
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if (!page->index) {
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error = stuffed_readpage(ip, page);
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unlock_page(page);
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} else
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error = zero_readpage(page);
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} else
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error = mpage_readpage(page, gfs2_get_block);
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if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
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error = -EIO;
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if (file != &gfs2_internal_file_sentinal) {
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gfs2_glock_dq_m(1, &gh);
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gfs2_holder_uninit(&gh);
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}
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out:
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return error;
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out_unlock:
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unlock_page(page);
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goto out;
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}
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/**
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* gfs2_prepare_write - Prepare to write a page to a file
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* @file: The file to write to
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* @page: The page which is to be prepared for writing
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* @from: From (byte range within page)
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* @to: To (byte range within page)
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*
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* Returns: errno
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*/
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static int gfs2_prepare_write(struct file *file, struct page *page,
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unsigned from, unsigned to)
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{
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struct gfs2_inode *ip = get_v2ip(page->mapping->host);
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struct gfs2_sbd *sdp = ip->i_sbd;
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unsigned int data_blocks, ind_blocks, rblocks;
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int alloc_required;
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int error = 0;
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loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + from;
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loff_t end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
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struct gfs2_alloc *al;
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atomic_inc(&sdp->sd_ops_address);
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gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME, &ip->i_gh);
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error = gfs2_glock_nq_m_atime(1, &ip->i_gh);
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if (error)
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goto out_uninit;
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gfs2_write_calc_reserv(ip, to - from, &data_blocks, &ind_blocks);
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error = gfs2_write_alloc_required(ip, pos, from - to, &alloc_required);
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if (error)
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goto out_unlock;
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if (alloc_required) {
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al = gfs2_alloc_get(ip);
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error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
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if (error)
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goto out_alloc_put;
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error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid);
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if (error)
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goto out_qunlock;
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al->al_requested = data_blocks + ind_blocks;
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error = gfs2_inplace_reserve(ip);
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if (error)
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goto out_qunlock;
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}
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rblocks = RES_DINODE + ind_blocks;
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if (gfs2_is_jdata(ip))
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rblocks += data_blocks ? data_blocks : 1;
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if (ind_blocks || data_blocks)
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rblocks += RES_STATFS + RES_QUOTA;
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error = gfs2_trans_begin(sdp, rblocks, 0);
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if (error)
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goto out;
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if (gfs2_is_stuffed(ip)) {
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if (end > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
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error = gfs2_unstuff_dinode(ip, gfs2_unstuffer_page, page);
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if (error == 0)
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goto prepare_write;
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} else if (!PageUptodate(page))
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error = stuffed_readpage(ip, page);
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goto out;
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}
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prepare_write:
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error = block_prepare_write(page, from, to, gfs2_get_block);
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out:
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if (error) {
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gfs2_trans_end(sdp);
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if (alloc_required) {
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gfs2_inplace_release(ip);
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out_qunlock:
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gfs2_quota_unlock(ip);
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out_alloc_put:
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gfs2_alloc_put(ip);
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}
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out_unlock:
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gfs2_glock_dq_m(1, &ip->i_gh);
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out_uninit:
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gfs2_holder_uninit(&ip->i_gh);
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}
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return error;
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}
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/**
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* gfs2_commit_write - Commit write to a file
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* @file: The file to write to
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* @page: The page containing the data
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* @from: From (byte range within page)
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* @to: To (byte range within page)
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*
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* Returns: errno
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*/
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static int gfs2_commit_write(struct file *file, struct page *page,
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unsigned from, unsigned to)
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{
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struct inode *inode = page->mapping->host;
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struct gfs2_inode *ip = get_v2ip(inode);
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struct gfs2_sbd *sdp = ip->i_sbd;
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int error = -EOPNOTSUPP;
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struct buffer_head *dibh;
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struct gfs2_alloc *al = &ip->i_alloc;;
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atomic_inc(&sdp->sd_ops_address);
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if (gfs2_assert_withdraw(sdp, gfs2_glock_is_locked_by_me(ip->i_gl)))
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goto fail_nounlock;
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error = gfs2_meta_inode_buffer(ip, &dibh);
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if (error)
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goto fail_endtrans;
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gfs2_trans_add_bh(ip->i_gl, dibh, 1);
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if (gfs2_is_stuffed(ip)) {
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uint64_t file_size;
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void *kaddr;
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file_size = ((uint64_t)page->index << PAGE_CACHE_SHIFT) + to;
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kaddr = kmap_atomic(page, KM_USER0);
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memcpy(dibh->b_data + sizeof(struct gfs2_dinode) + from,
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(char *)kaddr + from, to - from);
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kunmap_atomic(page, KM_USER0);
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SetPageUptodate(page);
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if (inode->i_size < file_size)
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i_size_write(inode, file_size);
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} else {
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if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip))
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gfs2_page_add_databufs(ip, page, from, to);
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error = generic_commit_write(file, page, from, to);
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if (error)
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goto fail;
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}
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if (ip->i_di.di_size < inode->i_size)
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ip->i_di.di_size = inode->i_size;
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gfs2_dinode_out(&ip->i_di, dibh->b_data);
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brelse(dibh);
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gfs2_trans_end(sdp);
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if (al->al_requested) {
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gfs2_inplace_release(ip);
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gfs2_quota_unlock(ip);
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gfs2_alloc_put(ip);
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}
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gfs2_glock_dq_m(1, &ip->i_gh);
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gfs2_holder_uninit(&ip->i_gh);
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return 0;
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fail:
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brelse(dibh);
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fail_endtrans:
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gfs2_trans_end(sdp);
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if (al->al_requested) {
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gfs2_inplace_release(ip);
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gfs2_quota_unlock(ip);
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gfs2_alloc_put(ip);
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}
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gfs2_glock_dq_m(1, &ip->i_gh);
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gfs2_holder_uninit(&ip->i_gh);
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fail_nounlock:
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ClearPageUptodate(page);
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return error;
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}
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/**
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* gfs2_bmap - Block map function
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* @mapping: Address space info
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* @lblock: The block to map
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*
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* Returns: The disk address for the block or 0 on hole or error
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*/
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static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
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{
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struct gfs2_inode *ip = get_v2ip(mapping->host);
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struct gfs2_holder i_gh;
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sector_t dblock = 0;
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int error;
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atomic_inc(&ip->i_sbd->sd_ops_address);
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error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
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if (error)
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return 0;
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if (!gfs2_is_stuffed(ip))
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dblock = generic_block_bmap(mapping, lblock, gfs2_get_block);
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gfs2_glock_dq_uninit(&i_gh);
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return dblock;
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}
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static void discard_buffer(struct gfs2_sbd *sdp, struct buffer_head *bh)
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{
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struct gfs2_bufdata *bd;
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gfs2_log_lock(sdp);
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bd = get_v2bd(bh);
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if (bd) {
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|
bd->bd_bh = NULL;
|
|
set_v2bd(bh, NULL);
|
|
gfs2_log_unlock(sdp);
|
|
brelse(bh);
|
|
} else
|
|
gfs2_log_unlock(sdp);
|
|
|
|
lock_buffer(bh);
|
|
clear_buffer_dirty(bh);
|
|
bh->b_bdev = NULL;
|
|
clear_buffer_mapped(bh);
|
|
clear_buffer_req(bh);
|
|
clear_buffer_new(bh);
|
|
clear_buffer_delay(bh);
|
|
unlock_buffer(bh);
|
|
}
|
|
|
|
static int gfs2_invalidatepage(struct page *page, unsigned long offset)
|
|
{
|
|
struct gfs2_sbd *sdp = get_v2sdp(page->mapping->host->i_sb);
|
|
struct buffer_head *head, *bh, *next;
|
|
unsigned int curr_off = 0;
|
|
int ret = 1;
|
|
|
|
BUG_ON(!PageLocked(page));
|
|
if (!page_has_buffers(page))
|
|
return 1;
|
|
|
|
bh = head = page_buffers(page);
|
|
do {
|
|
unsigned int next_off = curr_off + bh->b_size;
|
|
next = bh->b_this_page;
|
|
|
|
if (offset <= curr_off)
|
|
discard_buffer(sdp, bh);
|
|
|
|
curr_off = next_off;
|
|
bh = next;
|
|
} while (bh != head);
|
|
|
|
if (!offset)
|
|
ret = try_to_release_page(page, 0);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t gfs2_direct_IO_write(struct kiocb *iocb, const struct iovec *iov,
|
|
loff_t offset, unsigned long nr_segs)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct inode *inode = file->f_mapping->host;
|
|
struct gfs2_inode *ip = get_v2ip(inode);
|
|
struct gfs2_holder gh;
|
|
int rv;
|
|
|
|
/*
|
|
* Shared lock, even though its write, since we do no allocation
|
|
* on this path. All we need change is atime.
|
|
*/
|
|
gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh);
|
|
rv = gfs2_glock_nq_m_atime(1, &gh);
|
|
if (rv)
|
|
goto out;
|
|
|
|
/*
|
|
* Should we return an error here? I can't see that O_DIRECT for
|
|
* a journaled file makes any sense. For now we'll silently fall
|
|
* back to buffered I/O, likewise we do the same for stuffed
|
|
* files since they are (a) small and (b) unaligned.
|
|
*/
|
|
if (gfs2_is_jdata(ip))
|
|
goto out;
|
|
|
|
if (gfs2_is_stuffed(ip))
|
|
goto out;
|
|
|
|
rv = __blockdev_direct_IO(WRITE, iocb, inode, inode->i_sb->s_bdev,
|
|
iov, offset, nr_segs, get_blocks_noalloc,
|
|
NULL, DIO_OWN_LOCKING);
|
|
out:
|
|
gfs2_glock_dq_m(1, &gh);
|
|
gfs2_holder_uninit(&gh);
|
|
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* gfs2_direct_IO
|
|
*
|
|
* This is called with a shared lock already held for the read path.
|
|
* Currently, no locks are held when the write path is called.
|
|
*/
|
|
static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb,
|
|
const struct iovec *iov, loff_t offset,
|
|
unsigned long nr_segs)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct inode *inode = file->f_mapping->host;
|
|
struct gfs2_inode *ip = get_v2ip(inode);
|
|
struct gfs2_sbd *sdp = ip->i_sbd;
|
|
|
|
atomic_inc(&sdp->sd_ops_address);
|
|
|
|
if (rw == WRITE)
|
|
return gfs2_direct_IO_write(iocb, iov, offset, nr_segs);
|
|
|
|
if (gfs2_assert_warn(sdp, gfs2_glock_is_locked_by_me(ip->i_gl)) ||
|
|
gfs2_assert_warn(sdp, !gfs2_is_stuffed(ip)))
|
|
return -EINVAL;
|
|
|
|
return __blockdev_direct_IO(READ, iocb, inode, inode->i_sb->s_bdev, iov,
|
|
offset, nr_segs, get_blocks, NULL,
|
|
DIO_OWN_LOCKING);
|
|
}
|
|
|
|
struct address_space_operations gfs2_file_aops = {
|
|
.writepage = gfs2_writepage,
|
|
.readpage = gfs2_readpage,
|
|
.sync_page = block_sync_page,
|
|
.prepare_write = gfs2_prepare_write,
|
|
.commit_write = gfs2_commit_write,
|
|
.bmap = gfs2_bmap,
|
|
.invalidatepage = gfs2_invalidatepage,
|
|
.direct_IO = gfs2_direct_IO,
|
|
};
|
|
|