281 lines
6.2 KiB
C
281 lines
6.2 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 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/mm.h>
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#include <linux/gfs2_ondisk.h>
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#include "gfs2.h"
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#include "lm_interface.h"
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#include "incore.h"
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#include "bmap.h"
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#include "inode.h"
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#include "page.h"
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#include "trans.h"
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#include "ops_address.h"
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#include "util.h"
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/**
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* gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
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* @gl: the glock
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*
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*/
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void gfs2_pte_inval(struct gfs2_glock *gl)
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{
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struct gfs2_inode *ip;
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struct inode *inode;
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ip = gl->gl_object;
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if (!ip || !S_ISREG(ip->i_di.di_mode))
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return;
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if (!test_bit(GIF_PAGED, &ip->i_flags))
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return;
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inode = gfs2_ip2v_lookup(ip);
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if (inode) {
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unmap_shared_mapping_range(inode->i_mapping, 0, 0);
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iput(inode);
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if (test_bit(GIF_SW_PAGED, &ip->i_flags))
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set_bit(GLF_DIRTY, &gl->gl_flags);
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}
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clear_bit(GIF_SW_PAGED, &ip->i_flags);
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}
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/**
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* gfs2_page_inval - Invalidate all pages associated with a glock
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* @gl: the glock
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*
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*/
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void gfs2_page_inval(struct gfs2_glock *gl)
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{
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struct gfs2_inode *ip;
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struct inode *inode;
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ip = gl->gl_object;
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if (!ip || !S_ISREG(ip->i_di.di_mode))
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return;
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inode = gfs2_ip2v_lookup(ip);
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if (inode) {
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struct address_space *mapping = inode->i_mapping;
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truncate_inode_pages(mapping, 0);
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gfs2_assert_withdraw(ip->i_sbd, !mapping->nrpages);
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iput(inode);
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}
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clear_bit(GIF_PAGED, &ip->i_flags);
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}
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/**
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* gfs2_page_sync - Sync the data pages (not metadata) associated with a glock
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* @gl: the glock
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* @flags: DIO_START | DIO_WAIT
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*
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* Syncs data (not metadata) for a regular file.
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* No-op for all other types.
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*/
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void gfs2_page_sync(struct gfs2_glock *gl, int flags)
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{
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struct gfs2_inode *ip;
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struct inode *inode;
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ip = gl->gl_object;
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if (!ip || !S_ISREG(ip->i_di.di_mode))
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return;
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inode = gfs2_ip2v_lookup(ip);
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if (inode) {
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struct address_space *mapping = inode->i_mapping;
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int error = 0;
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if (flags & DIO_START)
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filemap_fdatawrite(mapping);
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if (!error && (flags & DIO_WAIT))
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error = filemap_fdatawait(mapping);
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/* Put back any errors cleared by filemap_fdatawait()
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so they can be caught by someone who can pass them
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up to user space. */
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if (error == -ENOSPC)
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set_bit(AS_ENOSPC, &mapping->flags);
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else if (error)
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set_bit(AS_EIO, &mapping->flags);
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iput(inode);
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}
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}
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/**
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* gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page
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* @ip: the inode
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* @dibh: the dinode buffer
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* @block: the block number that was allocated
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* @private: any locked page held by the caller process
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*
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* Returns: errno
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*/
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int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
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uint64_t block, void *private)
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{
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struct gfs2_sbd *sdp = ip->i_sbd;
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struct inode *inode = ip->i_vnode;
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struct page *page = (struct page *)private;
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struct buffer_head *bh;
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int release = 0;
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if (!page || page->index) {
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page = grab_cache_page(inode->i_mapping, 0);
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if (!page)
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return -ENOMEM;
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release = 1;
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}
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if (!PageUptodate(page)) {
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void *kaddr = kmap(page);
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memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode),
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ip->i_di.di_size);
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memset(kaddr + ip->i_di.di_size, 0,
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PAGE_CACHE_SIZE - ip->i_di.di_size);
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kunmap(page);
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SetPageUptodate(page);
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}
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if (!page_has_buffers(page))
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create_empty_buffers(page, 1 << inode->i_blkbits,
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(1 << BH_Uptodate));
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bh = page_buffers(page);
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if (!buffer_mapped(bh))
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map_bh(bh, inode->i_sb, block);
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set_buffer_uptodate(bh);
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if ((sdp->sd_args.ar_data == GFS2_DATA_ORDERED) || gfs2_is_jdata(ip))
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gfs2_trans_add_bh(ip->i_gl, bh, 0);
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mark_buffer_dirty(bh);
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if (release) {
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unlock_page(page);
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page_cache_release(page);
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}
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return 0;
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}
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/**
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* gfs2_block_truncate_page - Deal with zeroing out data for truncate
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*
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* This is partly borrowed from ext3.
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*/
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int gfs2_block_truncate_page(struct address_space *mapping)
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{
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struct inode *inode = mapping->host;
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struct gfs2_inode *ip = inode->u.generic_ip;
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struct gfs2_sbd *sdp = ip->i_sbd;
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loff_t from = inode->i_size;
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unsigned long index = from >> PAGE_CACHE_SHIFT;
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unsigned offset = from & (PAGE_CACHE_SIZE-1);
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unsigned blocksize, iblock, length, pos;
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struct buffer_head *bh;
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struct page *page;
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void *kaddr;
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int err;
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page = grab_cache_page(mapping, index);
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if (!page)
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return 0;
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blocksize = inode->i_sb->s_blocksize;
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length = blocksize - (offset & (blocksize - 1));
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iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
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if (!page_has_buffers(page))
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create_empty_buffers(page, blocksize, 0);
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/* Find the buffer that contains "offset" */
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bh = page_buffers(page);
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pos = blocksize;
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while (offset >= pos) {
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bh = bh->b_this_page;
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iblock++;
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pos += blocksize;
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}
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err = 0;
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if (!buffer_mapped(bh)) {
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gfs2_get_block(inode, iblock, bh, 0);
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/* unmapped? It's a hole - nothing to do */
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if (!buffer_mapped(bh))
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goto unlock;
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}
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/* Ok, it's mapped. Make sure it's up-to-date */
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if (PageUptodate(page))
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set_buffer_uptodate(bh);
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if (!buffer_uptodate(bh)) {
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err = -EIO;
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ll_rw_block(READ, 1, &bh);
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wait_on_buffer(bh);
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/* Uhhuh. Read error. Complain and punt. */
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if (!buffer_uptodate(bh))
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goto unlock;
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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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gfs2_trans_add_bh(ip->i_gl, bh, 0);
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kaddr = kmap_atomic(page, KM_USER0);
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memset(kaddr + offset, 0, length);
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flush_dcache_page(page);
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kunmap_atomic(kaddr, KM_USER0);
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unlock:
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unlock_page(page);
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page_cache_release(page);
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return err;
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}
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void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
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unsigned int from, unsigned int to)
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{
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struct buffer_head *head = page_buffers(page);
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unsigned int bsize = head->b_size;
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struct buffer_head *bh;
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unsigned int start, end;
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for (bh = head, start = 0;
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bh != head || !start;
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bh = bh->b_this_page, start = end) {
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end = start + bsize;
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if (end <= from || start >= to)
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continue;
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gfs2_trans_add_bh(ip->i_gl, bh, 0);
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}
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}
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