![Robert P. J. Day](/assets/img/avatar_default.png)
Replace appropriate pairs of "kmem_cache_alloc()" + "memset(0)" with the corresponding "kmem_cache_zalloc()" call. Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Andi Kleen <ak@muc.de> Cc: Roland McGrath <roland@redhat.com> Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: Greg KH <greg@kroah.com> Acked-by: Joel Becker <Joel.Becker@oracle.com> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Jan Kara <jack@ucw.cz> Cc: Michael Halcrow <mhalcrow@us.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Stephen Smalley <sds@tycho.nsa.gov> Cc: James Morris <jmorris@namei.org> Cc: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
574 lines
12 KiB
C
574 lines
12 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 version 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/mm.h>
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#include <linux/pagemap.h>
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#include <linux/writeback.h>
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#include <linux/swap.h>
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#include <linux/delay.h>
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#include <linux/bio.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/lm_interface.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "glock.h"
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#include "glops.h"
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#include "inode.h"
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#include "log.h"
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#include "lops.h"
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#include "meta_io.h"
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#include "rgrp.h"
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#include "trans.h"
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#include "util.h"
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#include "ops_address.h"
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static int aspace_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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gfs2_assert_warn(inode->i_sb->s_fs_info, 0);
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return -EOPNOTSUPP;
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}
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static int gfs2_aspace_writepage(struct page *page,
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struct writeback_control *wbc)
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{
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return block_write_full_page(page, aspace_get_block, wbc);
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}
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static const struct address_space_operations aspace_aops = {
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.writepage = gfs2_aspace_writepage,
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.releasepage = gfs2_releasepage,
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};
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/**
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* gfs2_aspace_get - Create and initialize a struct inode structure
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* @sdp: the filesystem the aspace is in
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*
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* Right now a struct inode is just a struct inode. Maybe Linux
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* will supply a more lightweight address space construct (that works)
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* in the future.
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*
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* Make sure pages/buffers in this aspace aren't in high memory.
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*
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* Returns: the aspace
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*/
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struct inode *gfs2_aspace_get(struct gfs2_sbd *sdp)
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{
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struct inode *aspace;
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aspace = new_inode(sdp->sd_vfs);
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if (aspace) {
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mapping_set_gfp_mask(aspace->i_mapping, GFP_NOFS);
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aspace->i_mapping->a_ops = &aspace_aops;
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aspace->i_size = ~0ULL;
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aspace->i_private = NULL;
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insert_inode_hash(aspace);
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}
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return aspace;
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}
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void gfs2_aspace_put(struct inode *aspace)
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{
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remove_inode_hash(aspace);
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iput(aspace);
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}
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/**
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* gfs2_meta_inval - Invalidate all buffers 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_meta_inval(struct gfs2_glock *gl)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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struct inode *aspace = gl->gl_aspace;
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struct address_space *mapping = gl->gl_aspace->i_mapping;
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gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
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atomic_inc(&aspace->i_writecount);
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truncate_inode_pages(mapping, 0);
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atomic_dec(&aspace->i_writecount);
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gfs2_assert_withdraw(sdp, !mapping->nrpages);
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}
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/**
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* gfs2_meta_sync - Sync all buffers 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_meta_sync(struct gfs2_glock *gl)
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{
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struct address_space *mapping = gl->gl_aspace->i_mapping;
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int error;
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filemap_fdatawrite(mapping);
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error = filemap_fdatawait(mapping);
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if (error)
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gfs2_io_error(gl->gl_sbd);
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}
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/**
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* getbuf - Get a buffer with a given address space
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* @gl: the glock
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* @blkno: the block number (filesystem scope)
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* @create: 1 if the buffer should be created
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*
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* Returns: the buffer
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*/
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static struct buffer_head *getbuf(struct gfs2_glock *gl, u64 blkno, int create)
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{
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struct address_space *mapping = gl->gl_aspace->i_mapping;
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struct gfs2_sbd *sdp = gl->gl_sbd;
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struct page *page;
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struct buffer_head *bh;
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unsigned int shift;
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unsigned long index;
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unsigned int bufnum;
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shift = PAGE_CACHE_SHIFT - sdp->sd_sb.sb_bsize_shift;
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index = blkno >> shift; /* convert block to page */
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bufnum = blkno - (index << shift); /* block buf index within page */
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if (create) {
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for (;;) {
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page = grab_cache_page(mapping, index);
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if (page)
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break;
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yield();
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}
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} else {
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page = find_lock_page(mapping, index);
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if (!page)
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return NULL;
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}
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if (!page_has_buffers(page))
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create_empty_buffers(page, sdp->sd_sb.sb_bsize, 0);
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/* Locate header for our buffer within our page */
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for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page)
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/* Do nothing */;
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get_bh(bh);
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if (!buffer_mapped(bh))
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map_bh(bh, sdp->sd_vfs, blkno);
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unlock_page(page);
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mark_page_accessed(page);
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page_cache_release(page);
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return bh;
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}
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static void meta_prep_new(struct buffer_head *bh)
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{
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struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data;
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lock_buffer(bh);
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clear_buffer_dirty(bh);
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set_buffer_uptodate(bh);
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unlock_buffer(bh);
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mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
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}
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/**
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* gfs2_meta_new - Get a block
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* @gl: The glock associated with this block
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* @blkno: The block number
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*
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* Returns: The buffer
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*/
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struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno)
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{
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struct buffer_head *bh;
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bh = getbuf(gl, blkno, CREATE);
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meta_prep_new(bh);
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return bh;
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}
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/**
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* gfs2_meta_read - Read a block from disk
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* @gl: The glock covering the block
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* @blkno: The block number
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* @flags: flags
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* @bhp: the place where the buffer is returned (NULL on failure)
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*
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* Returns: errno
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*/
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int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
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struct buffer_head **bhp)
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{
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*bhp = getbuf(gl, blkno, CREATE);
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if (!buffer_uptodate(*bhp))
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ll_rw_block(READ_META, 1, bhp);
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if (flags & DIO_WAIT) {
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int error = gfs2_meta_wait(gl->gl_sbd, *bhp);
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if (error) {
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brelse(*bhp);
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return error;
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}
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}
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return 0;
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}
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/**
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* gfs2_meta_wait - Reread a block from disk
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* @sdp: the filesystem
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* @bh: The block to wait for
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*
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* Returns: errno
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*/
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int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh)
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{
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if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
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return -EIO;
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wait_on_buffer(bh);
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if (!buffer_uptodate(bh)) {
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struct gfs2_trans *tr = current->journal_info;
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if (tr && tr->tr_touched)
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gfs2_io_error_bh(sdp, bh);
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return -EIO;
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}
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if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
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return -EIO;
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return 0;
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}
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/**
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* gfs2_attach_bufdata - attach a struct gfs2_bufdata structure to a buffer
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* @gl: the glock the buffer belongs to
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* @bh: The buffer to be attached to
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* @meta: Flag to indicate whether its metadata or not
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*/
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void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh,
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int meta)
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{
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struct gfs2_bufdata *bd;
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if (meta)
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lock_page(bh->b_page);
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if (bh->b_private) {
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if (meta)
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unlock_page(bh->b_page);
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return;
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}
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bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL),
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bd->bd_bh = bh;
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bd->bd_gl = gl;
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INIT_LIST_HEAD(&bd->bd_list_tr);
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if (meta)
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lops_init_le(&bd->bd_le, &gfs2_buf_lops);
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else
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lops_init_le(&bd->bd_le, &gfs2_databuf_lops);
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bh->b_private = bd;
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if (meta)
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unlock_page(bh->b_page);
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}
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/**
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* gfs2_pin - Pin a buffer in memory
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* @sdp: the filesystem the buffer belongs to
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* @bh: The buffer to be pinned
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*
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*/
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void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh)
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{
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struct gfs2_bufdata *bd = bh->b_private;
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gfs2_assert_withdraw(sdp, test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags));
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if (test_set_buffer_pinned(bh))
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gfs2_assert_withdraw(sdp, 0);
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wait_on_buffer(bh);
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/* If this buffer is in the AIL and it has already been written
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to in-place disk block, remove it from the AIL. */
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gfs2_log_lock(sdp);
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if (bd->bd_ail && !buffer_in_io(bh))
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list_move(&bd->bd_ail_st_list, &bd->bd_ail->ai_ail2_list);
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gfs2_log_unlock(sdp);
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clear_buffer_dirty(bh);
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wait_on_buffer(bh);
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if (!buffer_uptodate(bh))
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gfs2_io_error_bh(sdp, bh);
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get_bh(bh);
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}
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/**
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* gfs2_unpin - Unpin a buffer
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* @sdp: the filesystem the buffer belongs to
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* @bh: The buffer to unpin
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* @ai:
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*
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*/
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void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
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struct gfs2_ail *ai)
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{
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struct gfs2_bufdata *bd = bh->b_private;
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gfs2_assert_withdraw(sdp, buffer_uptodate(bh));
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if (!buffer_pinned(bh))
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gfs2_assert_withdraw(sdp, 0);
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mark_buffer_dirty(bh);
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clear_buffer_pinned(bh);
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gfs2_log_lock(sdp);
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if (bd->bd_ail) {
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list_del(&bd->bd_ail_st_list);
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brelse(bh);
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} else {
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struct gfs2_glock *gl = bd->bd_gl;
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list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list);
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atomic_inc(&gl->gl_ail_count);
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}
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bd->bd_ail = ai;
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list_add(&bd->bd_ail_st_list, &ai->ai_ail1_list);
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gfs2_log_unlock(sdp);
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}
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/**
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* gfs2_meta_wipe - make inode's buffers so they aren't dirty/pinned anymore
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* @ip: the inode who owns the buffers
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* @bstart: the first buffer in the run
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* @blen: the number of buffers in the run
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*
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*/
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void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen)
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{
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struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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struct buffer_head *bh;
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while (blen) {
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bh = getbuf(ip->i_gl, bstart, NO_CREATE);
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if (bh) {
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struct gfs2_bufdata *bd = bh->b_private;
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if (test_clear_buffer_pinned(bh)) {
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struct gfs2_trans *tr = current->journal_info;
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gfs2_log_lock(sdp);
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list_del_init(&bd->bd_le.le_list);
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gfs2_assert_warn(sdp, sdp->sd_log_num_buf);
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sdp->sd_log_num_buf--;
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gfs2_log_unlock(sdp);
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tr->tr_num_buf_rm++;
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brelse(bh);
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}
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if (bd) {
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gfs2_log_lock(sdp);
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if (bd->bd_ail) {
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u64 blkno = bh->b_blocknr;
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bd->bd_ail = NULL;
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list_del(&bd->bd_ail_st_list);
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list_del(&bd->bd_ail_gl_list);
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atomic_dec(&bd->bd_gl->gl_ail_count);
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brelse(bh);
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gfs2_log_unlock(sdp);
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gfs2_trans_add_revoke(sdp, blkno);
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} else
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gfs2_log_unlock(sdp);
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}
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lock_buffer(bh);
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clear_buffer_dirty(bh);
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clear_buffer_uptodate(bh);
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unlock_buffer(bh);
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brelse(bh);
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}
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bstart++;
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blen--;
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}
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}
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/**
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* gfs2_meta_cache_flush - get rid of any references on buffers for this inode
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* @ip: The GFS2 inode
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*
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* This releases buffers that are in the most-recently-used array of
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* blocks used for indirect block addressing for this inode.
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*/
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void gfs2_meta_cache_flush(struct gfs2_inode *ip)
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{
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struct buffer_head **bh_slot;
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unsigned int x;
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spin_lock(&ip->i_spin);
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for (x = 0; x < GFS2_MAX_META_HEIGHT; x++) {
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bh_slot = &ip->i_cache[x];
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if (!*bh_slot)
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break;
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brelse(*bh_slot);
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*bh_slot = NULL;
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}
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spin_unlock(&ip->i_spin);
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}
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/**
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* gfs2_meta_indirect_buffer - Get a metadata buffer
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* @ip: The GFS2 inode
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* @height: The level of this buf in the metadata (indir addr) tree (if any)
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* @num: The block number (device relative) of the buffer
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* @new: Non-zero if we may create a new buffer
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* @bhp: the buffer is returned here
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*
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* Try to use the gfs2_inode's MRU metadata tree cache.
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*
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* Returns: errno
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*/
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int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
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int new, struct buffer_head **bhp)
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{
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struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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struct gfs2_glock *gl = ip->i_gl;
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struct buffer_head *bh = NULL, **bh_slot = ip->i_cache + height;
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int in_cache = 0;
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BUG_ON(!gl);
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BUG_ON(!sdp);
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spin_lock(&ip->i_spin);
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if (*bh_slot && (*bh_slot)->b_blocknr == num) {
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bh = *bh_slot;
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get_bh(bh);
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in_cache = 1;
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}
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spin_unlock(&ip->i_spin);
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if (!bh)
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bh = getbuf(gl, num, CREATE);
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if (!bh)
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return -ENOBUFS;
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if (new) {
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if (gfs2_assert_warn(sdp, height))
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goto err;
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meta_prep_new(bh);
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gfs2_trans_add_bh(ip->i_gl, bh, 1);
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gfs2_metatype_set(bh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
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gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
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} else {
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u32 mtype = height ? GFS2_METATYPE_IN : GFS2_METATYPE_DI;
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if (!buffer_uptodate(bh)) {
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ll_rw_block(READ_META, 1, &bh);
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if (gfs2_meta_wait(sdp, bh))
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goto err;
|
|
}
|
|
if (gfs2_metatype_check(sdp, bh, mtype))
|
|
goto err;
|
|
}
|
|
|
|
if (!in_cache) {
|
|
spin_lock(&ip->i_spin);
|
|
if (*bh_slot)
|
|
brelse(*bh_slot);
|
|
*bh_slot = bh;
|
|
get_bh(bh);
|
|
spin_unlock(&ip->i_spin);
|
|
}
|
|
|
|
*bhp = bh;
|
|
return 0;
|
|
err:
|
|
brelse(bh);
|
|
return -EIO;
|
|
}
|
|
|
|
/**
|
|
* gfs2_meta_ra - start readahead on an extent of a file
|
|
* @gl: the glock the blocks belong to
|
|
* @dblock: the starting disk block
|
|
* @extlen: the number of blocks in the extent
|
|
*
|
|
* returns: the first buffer in the extent
|
|
*/
|
|
|
|
struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
|
|
{
|
|
struct gfs2_sbd *sdp = gl->gl_sbd;
|
|
struct buffer_head *first_bh, *bh;
|
|
u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >>
|
|
sdp->sd_sb.sb_bsize_shift;
|
|
|
|
BUG_ON(!extlen);
|
|
|
|
if (max_ra < 1)
|
|
max_ra = 1;
|
|
if (extlen > max_ra)
|
|
extlen = max_ra;
|
|
|
|
first_bh = getbuf(gl, dblock, CREATE);
|
|
|
|
if (buffer_uptodate(first_bh))
|
|
goto out;
|
|
if (!buffer_locked(first_bh))
|
|
ll_rw_block(READ_META, 1, &first_bh);
|
|
|
|
dblock++;
|
|
extlen--;
|
|
|
|
while (extlen) {
|
|
bh = getbuf(gl, dblock, CREATE);
|
|
|
|
if (!buffer_uptodate(bh) && !buffer_locked(bh))
|
|
ll_rw_block(READA, 1, &bh);
|
|
brelse(bh);
|
|
dblock++;
|
|
extlen--;
|
|
if (!buffer_locked(first_bh) && buffer_uptodate(first_bh))
|
|
goto out;
|
|
}
|
|
|
|
wait_on_buffer(first_bh);
|
|
out:
|
|
return first_bh;
|
|
}
|
|
|