e90c01e148
The original code ordered the blocks allocated in the build_height routine backwards causing excessive disk seeks during a read of the metadata. This patch reverses the order to try and reduce disk seeks. Example: A five level metadata tree, I = Inode, P = Pointers, D = Data You need to read the blocks in the order: I P5 P4 P3 P2 P1 D in order to read a single data block. The new code now orders the blocks in this way. The old code used to order them as: I P1 P2 P3 P4 P5 D requiring two extra seeks on average. Note that for files which are grown by gradual extension rather than by truncate or by llseek/write at a large offset, this doesn't apply. In the case of writing to a file linearly, this routine will only be called upon to extend the height of the tree by one block at a time, so the ordering is determined by when its called rather than by the internals of the routine itself. Optimising that part of the ordering is a much harder problem. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
1105 lines
26 KiB
C
1105 lines
26 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/gfs2_ondisk.h>
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#include <linux/crc32.h>
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#include <asm/semaphore.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 "glock.h"
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#include "inode.h"
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#include "meta_io.h"
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#include "page.h"
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#include "quota.h"
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#include "rgrp.h"
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#include "trans.h"
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#include "dir.h"
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#include "util.h"
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/* This doesn't need to be that large as max 64 bit pointers in a 4k
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* block is 512, so __u16 is fine for that. It saves stack space to
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* keep it small.
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*/
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struct metapath {
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__u16 mp_list[GFS2_MAX_META_HEIGHT];
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};
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typedef int (*block_call_t) (struct gfs2_inode *ip, struct buffer_head *dibh,
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struct buffer_head *bh, uint64_t *top,
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uint64_t *bottom, unsigned int height,
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void *data);
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struct strip_mine {
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int sm_first;
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unsigned int sm_height;
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};
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/**
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* gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big
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* @ip: The GFS2 inode to unstuff
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* @unstuffer: the routine that handles unstuffing a non-zero length file
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* @private: private data for the unstuffer
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*
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* This routine unstuffs a dinode and returns it to a "normal" state such
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* that the height can be grown in the traditional way.
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*
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* Returns: errno
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*/
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int gfs2_unstuff_dinode(struct gfs2_inode *ip, gfs2_unstuffer_t unstuffer,
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void *private)
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{
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struct buffer_head *bh, *dibh;
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uint64_t block = 0;
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int isdir = gfs2_is_dir(ip);
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int error;
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down_write(&ip->i_rw_mutex);
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error = gfs2_meta_inode_buffer(ip, &dibh);
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if (error)
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goto out;
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if (ip->i_di.di_size) {
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/* Get a free block, fill it with the stuffed data,
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and write it out to disk */
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if (isdir) {
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block = gfs2_alloc_meta(ip);
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error = gfs2_dir_get_new_buffer(ip, block, &bh);
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if (error)
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goto out_brelse;
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gfs2_buffer_copy_tail(bh,
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sizeof(struct gfs2_meta_header),
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dibh, sizeof(struct gfs2_dinode));
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brelse(bh);
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} else {
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block = gfs2_alloc_data(ip);
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error = unstuffer(ip, dibh, block, private);
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if (error)
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goto out_brelse;
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}
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}
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/* Set up the pointer to the new block */
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gfs2_trans_add_bh(ip->i_gl, dibh, 1);
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gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
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if (ip->i_di.di_size) {
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*(uint64_t *)(dibh->b_data + sizeof(struct gfs2_dinode)) =
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cpu_to_be64(block);
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ip->i_di.di_blocks++;
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}
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ip->i_di.di_height = 1;
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gfs2_dinode_out(&ip->i_di, dibh->b_data);
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out_brelse:
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brelse(dibh);
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out:
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up_write(&ip->i_rw_mutex);
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return error;
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}
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/**
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* calc_tree_height - Calculate the height of a metadata tree
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* @ip: The GFS2 inode
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* @size: The proposed size of the file
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*
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* Work out how tall a metadata tree needs to be in order to accommodate a
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* file of a particular size. If size is less than the current size of
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* the inode, then the current size of the inode is used instead of the
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* supplied one.
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*
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* Returns: the height the tree should be
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*/
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static unsigned int calc_tree_height(struct gfs2_inode *ip, uint64_t size)
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{
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struct gfs2_sbd *sdp = ip->i_sbd;
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uint64_t *arr;
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unsigned int max, height;
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if (ip->i_di.di_size > size)
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size = ip->i_di.di_size;
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if (gfs2_is_dir(ip)) {
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arr = sdp->sd_jheightsize;
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max = sdp->sd_max_jheight;
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} else {
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arr = sdp->sd_heightsize;
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max = sdp->sd_max_height;
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}
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for (height = 0; height < max; height++)
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if (arr[height] >= size)
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break;
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return height;
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}
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/**
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* build_height - Build a metadata tree of the requested height
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* @ip: The GFS2 inode
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* @height: The height to build to
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*
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*
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* Returns: errno
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*/
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static int build_height(struct inode *inode, unsigned height)
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{
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struct gfs2_inode *ip = inode->u.generic_ip;
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unsigned new_height = height - ip->i_di.di_height;
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struct buffer_head *dibh;
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struct buffer_head *blocks[GFS2_MAX_META_HEIGHT];
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int error;
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u64 *bp;
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u64 bn;
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unsigned n;
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if (height <= ip->i_di.di_height)
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return 0;
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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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for(n = 0; n < new_height; n++) {
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bn = gfs2_alloc_meta(ip);
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blocks[n] = gfs2_meta_new(ip->i_gl, bn);
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gfs2_trans_add_bh(ip->i_gl, blocks[n], 1);
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}
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n = 0;
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bn = blocks[0]->b_blocknr;
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if (new_height > 1) {
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for(; n < new_height-1; n++) {
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gfs2_metatype_set(blocks[n], GFS2_METATYPE_IN,
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GFS2_FORMAT_IN);
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gfs2_buffer_clear_tail(blocks[n],
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sizeof(struct gfs2_meta_header));
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bp = (u64 *)(blocks[n]->b_data +
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sizeof(struct gfs2_meta_header));
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*bp = cpu_to_be64(blocks[n+1]->b_blocknr);
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brelse(blocks[n]);
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blocks[n] = NULL;
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}
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}
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gfs2_metatype_set(blocks[n], GFS2_METATYPE_IN, GFS2_FORMAT_IN);
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gfs2_buffer_copy_tail(blocks[n], sizeof(struct gfs2_meta_header),
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dibh, sizeof(struct gfs2_dinode));
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brelse(blocks[n]);
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gfs2_trans_add_bh(ip->i_gl, dibh, 1);
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gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
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bp = (u64 *)(dibh->b_data + sizeof(struct gfs2_dinode));
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*bp = cpu_to_be64(bn);
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ip->i_di.di_height += new_height;
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ip->i_di.di_blocks += new_height;
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gfs2_dinode_out(&ip->i_di, dibh->b_data);
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brelse(dibh);
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return error;
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}
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/**
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* find_metapath - Find path through the metadata tree
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* @ip: The inode pointer
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* @mp: The metapath to return the result in
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* @block: The disk block to look up
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*
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* This routine returns a struct metapath structure that defines a path
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* through the metadata of inode "ip" to get to block "block".
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*
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* Example:
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* Given: "ip" is a height 3 file, "offset" is 101342453, and this is a
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* filesystem with a blocksize of 4096.
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*
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* find_metapath() would return a struct metapath structure set to:
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* mp_offset = 101342453, mp_height = 3, mp_list[0] = 0, mp_list[1] = 48,
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* and mp_list[2] = 165.
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*
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* That means that in order to get to the block containing the byte at
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* offset 101342453, we would load the indirect block pointed to by pointer
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* 0 in the dinode. We would then load the indirect block pointed to by
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* pointer 48 in that indirect block. We would then load the data block
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* pointed to by pointer 165 in that indirect block.
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*
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* ----------------------------------------
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* | Dinode | |
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* | | 4|
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* | |0 1 2 3 4 5 9|
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* | | 6|
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* ----------------------------------------
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* |
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* |
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* V
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* ----------------------------------------
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* | Indirect Block |
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* | 5|
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* | 4 4 4 4 4 5 5 1|
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* |0 5 6 7 8 9 0 1 2|
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* ----------------------------------------
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* |
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* |
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* V
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* ----------------------------------------
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* | Indirect Block |
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* | 1 1 1 1 1 5|
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* | 6 6 6 6 6 1|
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* |0 3 4 5 6 7 2|
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* ----------------------------------------
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* |
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* |
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* V
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* ----------------------------------------
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* | Data block containing offset |
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* | 101342453 |
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* | |
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* | |
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* ----------------------------------------
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*
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*/
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static void find_metapath(struct gfs2_inode *ip, uint64_t block,
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struct metapath *mp)
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{
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struct gfs2_sbd *sdp = ip->i_sbd;
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uint64_t b = block;
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unsigned int i;
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for (i = ip->i_di.di_height; i--;)
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mp->mp_list[i] = (__u16)do_div(b, sdp->sd_inptrs);
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}
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/**
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* metapointer - Return pointer to start of metadata in a buffer
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* @bh: The buffer
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* @height: The metadata height (0 = dinode)
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* @mp: The metapath
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*
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* Return a pointer to the block number of the next height of the metadata
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* tree given a buffer containing the pointer to the current height of the
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* metadata tree.
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*/
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static inline u64 *metapointer(struct buffer_head *bh, int *boundary,
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unsigned int height, const struct metapath *mp)
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{
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unsigned int head_size = (height > 0) ?
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sizeof(struct gfs2_meta_header) : sizeof(struct gfs2_dinode);
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u64 *ptr;
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*boundary = 0;
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ptr = ((u64 *)(bh->b_data + head_size)) + mp->mp_list[height];
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if (ptr + 1 == (u64*)(bh->b_data + bh->b_size))
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*boundary = 1;
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return ptr;
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}
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/**
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* lookup_block - Get the next metadata block in metadata tree
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* @ip: The GFS2 inode
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* @bh: Buffer containing the pointers to metadata blocks
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* @height: The height of the tree (0 = dinode)
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* @mp: The metapath
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* @create: Non-zero if we may create a new meatdata block
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* @new: Used to indicate if we did create a new metadata block
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* @block: the returned disk block number
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*
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* Given a metatree, complete to a particular height, checks to see if the next
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* height of the tree exists. If not the next height of the tree is created.
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* The block number of the next height of the metadata tree is returned.
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*
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*/
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static int lookup_block(struct gfs2_inode *ip, struct buffer_head *bh,
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unsigned int height, struct metapath *mp, int create,
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int *new, uint64_t *block)
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{
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int boundary;
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uint64_t *ptr = metapointer(bh, &boundary, height, mp);
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if (*ptr) {
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*block = be64_to_cpu(*ptr);
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return boundary;
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}
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*block = 0;
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if (!create)
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return 0;
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if (height == ip->i_di.di_height - 1 && !gfs2_is_dir(ip))
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*block = gfs2_alloc_data(ip);
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else
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*block = gfs2_alloc_meta(ip);
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gfs2_trans_add_bh(ip->i_gl, bh, 1);
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*ptr = cpu_to_be64(*block);
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ip->i_di.di_blocks++;
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*new = 1;
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return 0;
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}
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/**
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* gfs2_block_pointers - Map a block from an inode to a disk block
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* @inode: The inode
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* @lblock: The logical block number
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* @new: Value/Result argument (1 = may create/did create new blocks)
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* @boundary: gets set if we've hit a block boundary
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* @mp: metapath to use
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*
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* Find the block number on the current device which corresponds to an
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* inode's block. If the block had to be created, "new" will be set.
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*
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* Returns: errno
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*/
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static struct buffer_head *gfs2_block_pointers(struct inode *inode, u64 lblock,
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int *new, u64 *dblock,
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int *boundary,
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struct metapath *mp)
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{
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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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struct buffer_head *bh;
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int create = *new;
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unsigned int bsize;
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unsigned int height;
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unsigned int end_of_metadata;
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unsigned int x;
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int error = 0;
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*new = 0;
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*dblock = 0;
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if (gfs2_assert_warn(sdp, !gfs2_is_stuffed(ip)))
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goto out;
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bsize = (gfs2_is_dir(ip)) ? sdp->sd_jbsize : sdp->sd_sb.sb_bsize;
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height = calc_tree_height(ip, (lblock + 1) * bsize);
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if (ip->i_di.di_height < height) {
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if (!create)
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goto out;
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|
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error = build_height(inode, height);
|
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if (error)
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goto out;
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}
|
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|
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find_metapath(ip, lblock, mp);
|
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end_of_metadata = ip->i_di.di_height - 1;
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|
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error = gfs2_meta_inode_buffer(ip, &bh);
|
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if (error)
|
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goto out;
|
|
|
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for (x = 0; x < end_of_metadata; x++) {
|
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lookup_block(ip, bh, x, mp, create, new, dblock);
|
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brelse(bh);
|
|
if (!*dblock)
|
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goto out;
|
|
|
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error = gfs2_meta_indirect_buffer(ip, x+1, *dblock, *new, &bh);
|
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if (error)
|
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goto out;
|
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}
|
|
|
|
*boundary = lookup_block(ip, bh, end_of_metadata, mp, create, new, dblock);
|
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if (*new) {
|
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struct buffer_head *dibh;
|
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error = gfs2_meta_inode_buffer(ip, &dibh);
|
|
if (!error) {
|
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gfs2_trans_add_bh(ip->i_gl, dibh, 1);
|
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gfs2_dinode_out(&ip->i_di, dibh->b_data);
|
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brelse(dibh);
|
|
}
|
|
}
|
|
return bh;
|
|
out:
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
|
|
static inline void bmap_lock(struct inode *inode, int create)
|
|
{
|
|
struct gfs2_inode *ip = inode->u.generic_ip;
|
|
if (create)
|
|
down_write(&ip->i_rw_mutex);
|
|
else
|
|
down_read(&ip->i_rw_mutex);
|
|
}
|
|
|
|
static inline void bmap_unlock(struct inode *inode, int create)
|
|
{
|
|
struct gfs2_inode *ip = inode->u.generic_ip;
|
|
if (create)
|
|
up_write(&ip->i_rw_mutex);
|
|
else
|
|
up_read(&ip->i_rw_mutex);
|
|
}
|
|
|
|
int gfs2_block_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, int *boundary)
|
|
{
|
|
struct metapath mp;
|
|
struct buffer_head *bh;
|
|
int create = *new;
|
|
|
|
bmap_lock(inode, create);
|
|
bh = gfs2_block_pointers(inode, lblock, new, dblock, boundary, &mp);
|
|
bmap_unlock(inode, create);
|
|
if (!bh)
|
|
return 0;
|
|
if (IS_ERR(bh))
|
|
return PTR_ERR(bh);
|
|
brelse(bh);
|
|
return 0;
|
|
}
|
|
|
|
int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen)
|
|
{
|
|
struct gfs2_inode *ip = inode->u.generic_ip;
|
|
struct gfs2_sbd *sdp = ip->i_sbd;
|
|
struct metapath mp;
|
|
struct buffer_head *bh;
|
|
int boundary;
|
|
int create = *new;
|
|
|
|
BUG_ON(!extlen);
|
|
BUG_ON(!dblock);
|
|
BUG_ON(!new);
|
|
|
|
bmap_lock(inode, create);
|
|
bh = gfs2_block_pointers(inode, lblock, new, dblock, &boundary, &mp);
|
|
*extlen = 1;
|
|
|
|
if (bh && !IS_ERR(bh) && *dblock && !*new) {
|
|
u64 tmp_dblock;
|
|
int tmp_new;
|
|
unsigned int nptrs;
|
|
unsigned end_of_metadata = ip->i_di.di_height - 1;
|
|
|
|
nptrs = (end_of_metadata) ? sdp->sd_inptrs : sdp->sd_diptrs;
|
|
while (++mp.mp_list[end_of_metadata] < nptrs) {
|
|
lookup_block(ip, bh, end_of_metadata, &mp, 0, &tmp_new, &tmp_dblock);
|
|
if (*dblock + *extlen != tmp_dblock)
|
|
break;
|
|
(*extlen)++;
|
|
}
|
|
}
|
|
bmap_unlock(inode, create);
|
|
if (!bh)
|
|
return 0;
|
|
if (IS_ERR(bh))
|
|
return PTR_ERR(bh);
|
|
brelse(bh);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* recursive_scan - recursively scan through the end of a file
|
|
* @ip: the inode
|
|
* @dibh: the dinode buffer
|
|
* @mp: the path through the metadata to the point to start
|
|
* @height: the height the recursion is at
|
|
* @block: the indirect block to look at
|
|
* @first: 1 if this is the first block
|
|
* @bc: the call to make for each piece of metadata
|
|
* @data: data opaque to this function to pass to @bc
|
|
*
|
|
* When this is first called @height and @block should be zero and
|
|
* @first should be 1.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh,
|
|
struct metapath *mp, unsigned int height,
|
|
uint64_t block, int first, block_call_t bc,
|
|
void *data)
|
|
{
|
|
struct gfs2_sbd *sdp = ip->i_sbd;
|
|
struct buffer_head *bh = NULL;
|
|
uint64_t *top, *bottom;
|
|
uint64_t bn;
|
|
int error;
|
|
int mh_size = sizeof(struct gfs2_meta_header);
|
|
|
|
if (!height) {
|
|
error = gfs2_meta_inode_buffer(ip, &bh);
|
|
if (error)
|
|
return error;
|
|
dibh = bh;
|
|
|
|
top = (uint64_t *)(bh->b_data + sizeof(struct gfs2_dinode)) +
|
|
mp->mp_list[0];
|
|
bottom = (uint64_t *)(bh->b_data + sizeof(struct gfs2_dinode)) +
|
|
sdp->sd_diptrs;
|
|
} else {
|
|
error = gfs2_meta_indirect_buffer(ip, height, block, 0, &bh);
|
|
if (error)
|
|
return error;
|
|
|
|
top = (uint64_t *)(bh->b_data + mh_size) +
|
|
((first) ? mp->mp_list[height] : 0);
|
|
|
|
bottom = (uint64_t *)(bh->b_data + mh_size) + sdp->sd_inptrs;
|
|
}
|
|
|
|
error = bc(ip, dibh, bh, top, bottom, height, data);
|
|
if (error)
|
|
goto out;
|
|
|
|
if (height < ip->i_di.di_height - 1)
|
|
for (; top < bottom; top++, first = 0) {
|
|
if (!*top)
|
|
continue;
|
|
|
|
bn = be64_to_cpu(*top);
|
|
|
|
error = recursive_scan(ip, dibh, mp, height + 1, bn,
|
|
first, bc, data);
|
|
if (error)
|
|
break;
|
|
}
|
|
|
|
out:
|
|
brelse(bh);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* do_strip - Look for a layer a particular layer of the file and strip it off
|
|
* @ip: the inode
|
|
* @dibh: the dinode buffer
|
|
* @bh: A buffer of pointers
|
|
* @top: The first pointer in the buffer
|
|
* @bottom: One more than the last pointer
|
|
* @height: the height this buffer is at
|
|
* @data: a pointer to a struct strip_mine
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
|
|
struct buffer_head *bh, uint64_t *top, uint64_t *bottom,
|
|
unsigned int height, void *data)
|
|
{
|
|
struct strip_mine *sm = (struct strip_mine *)data;
|
|
struct gfs2_sbd *sdp = ip->i_sbd;
|
|
struct gfs2_rgrp_list rlist;
|
|
uint64_t bn, bstart;
|
|
uint32_t blen;
|
|
uint64_t *p;
|
|
unsigned int rg_blocks = 0;
|
|
int metadata;
|
|
unsigned int revokes = 0;
|
|
int x;
|
|
int error;
|
|
|
|
if (!*top)
|
|
sm->sm_first = 0;
|
|
|
|
if (height != sm->sm_height)
|
|
return 0;
|
|
|
|
if (sm->sm_first) {
|
|
top++;
|
|
sm->sm_first = 0;
|
|
}
|
|
|
|
metadata = (height != ip->i_di.di_height - 1);
|
|
if (metadata)
|
|
revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs;
|
|
|
|
error = gfs2_rindex_hold(sdp, &ip->i_alloc.al_ri_gh);
|
|
if (error)
|
|
return error;
|
|
|
|
memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
|
|
bstart = 0;
|
|
blen = 0;
|
|
|
|
for (p = top; p < bottom; p++) {
|
|
if (!*p)
|
|
continue;
|
|
|
|
bn = be64_to_cpu(*p);
|
|
|
|
if (bstart + blen == bn)
|
|
blen++;
|
|
else {
|
|
if (bstart)
|
|
gfs2_rlist_add(sdp, &rlist, bstart);
|
|
|
|
bstart = bn;
|
|
blen = 1;
|
|
}
|
|
}
|
|
|
|
if (bstart)
|
|
gfs2_rlist_add(sdp, &rlist, bstart);
|
|
else
|
|
goto out; /* Nothing to do */
|
|
|
|
gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, 0);
|
|
|
|
for (x = 0; x < rlist.rl_rgrps; x++) {
|
|
struct gfs2_rgrpd *rgd;
|
|
rgd = rlist.rl_ghs[x].gh_gl->gl_object;
|
|
rg_blocks += rgd->rd_ri.ri_length;
|
|
}
|
|
|
|
error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
|
|
if (error)
|
|
goto out_rlist;
|
|
|
|
error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE +
|
|
RES_INDIRECT + RES_STATFS + RES_QUOTA,
|
|
revokes);
|
|
if (error)
|
|
goto out_rg_gunlock;
|
|
|
|
down_write(&ip->i_rw_mutex);
|
|
|
|
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
|
|
gfs2_trans_add_bh(ip->i_gl, bh, 1);
|
|
|
|
bstart = 0;
|
|
blen = 0;
|
|
|
|
for (p = top; p < bottom; p++) {
|
|
if (!*p)
|
|
continue;
|
|
|
|
bn = be64_to_cpu(*p);
|
|
|
|
if (bstart + blen == bn)
|
|
blen++;
|
|
else {
|
|
if (bstart) {
|
|
if (metadata)
|
|
gfs2_free_meta(ip, bstart, blen);
|
|
else
|
|
gfs2_free_data(ip, bstart, blen);
|
|
}
|
|
|
|
bstart = bn;
|
|
blen = 1;
|
|
}
|
|
|
|
*p = 0;
|
|
if (!ip->i_di.di_blocks)
|
|
gfs2_consist_inode(ip);
|
|
ip->i_di.di_blocks--;
|
|
}
|
|
if (bstart) {
|
|
if (metadata)
|
|
gfs2_free_meta(ip, bstart, blen);
|
|
else
|
|
gfs2_free_data(ip, bstart, blen);
|
|
}
|
|
|
|
ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
|
|
|
|
gfs2_dinode_out(&ip->i_di, dibh->b_data);
|
|
|
|
up_write(&ip->i_rw_mutex);
|
|
|
|
gfs2_trans_end(sdp);
|
|
|
|
out_rg_gunlock:
|
|
gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
|
|
|
|
out_rlist:
|
|
gfs2_rlist_free(&rlist);
|
|
|
|
out:
|
|
gfs2_glock_dq_uninit(&ip->i_alloc.al_ri_gh);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* do_grow - Make a file look bigger than it is
|
|
* @ip: the inode
|
|
* @size: the size to set the file to
|
|
*
|
|
* Called with an exclusive lock on @ip.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int do_grow(struct gfs2_inode *ip, uint64_t size)
|
|
{
|
|
struct gfs2_sbd *sdp = ip->i_sbd;
|
|
struct gfs2_alloc *al;
|
|
struct buffer_head *dibh;
|
|
unsigned int h;
|
|
int error;
|
|
|
|
al = gfs2_alloc_get(ip);
|
|
|
|
error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
|
|
if (error)
|
|
goto out;
|
|
|
|
error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid);
|
|
if (error)
|
|
goto out_gunlock_q;
|
|
|
|
al->al_requested = sdp->sd_max_height + RES_DATA;
|
|
|
|
error = gfs2_inplace_reserve(ip);
|
|
if (error)
|
|
goto out_gunlock_q;
|
|
|
|
error = gfs2_trans_begin(sdp,
|
|
sdp->sd_max_height + al->al_rgd->rd_ri.ri_length +
|
|
RES_JDATA + RES_DINODE + RES_STATFS + RES_QUOTA, 0);
|
|
if (error)
|
|
goto out_ipres;
|
|
|
|
if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
|
|
if (gfs2_is_stuffed(ip)) {
|
|
error = gfs2_unstuff_dinode(ip, gfs2_unstuffer_page,
|
|
NULL);
|
|
if (error)
|
|
goto out_end_trans;
|
|
}
|
|
|
|
h = calc_tree_height(ip, size);
|
|
if (ip->i_di.di_height < h) {
|
|
down_write(&ip->i_rw_mutex);
|
|
error = build_height(ip->i_vnode, h);
|
|
up_write(&ip->i_rw_mutex);
|
|
if (error)
|
|
goto out_end_trans;
|
|
}
|
|
}
|
|
|
|
ip->i_di.di_size = size;
|
|
ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
|
|
|
|
error = gfs2_meta_inode_buffer(ip, &dibh);
|
|
if (error)
|
|
goto out_end_trans;
|
|
|
|
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
|
|
gfs2_dinode_out(&ip->i_di, dibh->b_data);
|
|
brelse(dibh);
|
|
|
|
out_end_trans:
|
|
gfs2_trans_end(sdp);
|
|
|
|
out_ipres:
|
|
gfs2_inplace_release(ip);
|
|
|
|
out_gunlock_q:
|
|
gfs2_quota_unlock(ip);
|
|
|
|
out:
|
|
gfs2_alloc_put(ip);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int trunc_start(struct gfs2_inode *ip, uint64_t size)
|
|
{
|
|
struct gfs2_sbd *sdp = ip->i_sbd;
|
|
struct buffer_head *dibh;
|
|
int journaled = gfs2_is_jdata(ip);
|
|
int error;
|
|
|
|
error = gfs2_trans_begin(sdp,
|
|
RES_DINODE + ((journaled) ? RES_JDATA : 0), 0);
|
|
if (error)
|
|
return error;
|
|
|
|
error = gfs2_meta_inode_buffer(ip, &dibh);
|
|
if (error)
|
|
goto out;
|
|
|
|
if (gfs2_is_stuffed(ip)) {
|
|
ip->i_di.di_size = size;
|
|
ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
|
|
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
|
|
gfs2_dinode_out(&ip->i_di, dibh->b_data);
|
|
gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + size);
|
|
error = 1;
|
|
|
|
} else {
|
|
if (size & (uint64_t)(sdp->sd_sb.sb_bsize - 1))
|
|
error = gfs2_block_truncate_page(ip->i_vnode->i_mapping);
|
|
|
|
if (!error) {
|
|
ip->i_di.di_size = size;
|
|
ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
|
|
ip->i_di.di_flags |= GFS2_DIF_TRUNC_IN_PROG;
|
|
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
|
|
gfs2_dinode_out(&ip->i_di, dibh->b_data);
|
|
}
|
|
}
|
|
|
|
brelse(dibh);
|
|
|
|
out:
|
|
gfs2_trans_end(sdp);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int trunc_dealloc(struct gfs2_inode *ip, uint64_t size)
|
|
{
|
|
unsigned int height = ip->i_di.di_height;
|
|
uint64_t lblock;
|
|
struct metapath mp;
|
|
int error;
|
|
|
|
if (!size)
|
|
lblock = 0;
|
|
else
|
|
lblock = (size - 1) >> ip->i_sbd->sd_sb.sb_bsize_shift;
|
|
|
|
find_metapath(ip, lblock, &mp);
|
|
gfs2_alloc_get(ip);
|
|
|
|
error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
|
|
if (error)
|
|
goto out;
|
|
|
|
while (height--) {
|
|
struct strip_mine sm;
|
|
sm.sm_first = !!size;
|
|
sm.sm_height = height;
|
|
|
|
error = recursive_scan(ip, NULL, &mp, 0, 0, 1, do_strip, &sm);
|
|
if (error)
|
|
break;
|
|
}
|
|
|
|
gfs2_quota_unhold(ip);
|
|
|
|
out:
|
|
gfs2_alloc_put(ip);
|
|
return error;
|
|
}
|
|
|
|
static int trunc_end(struct gfs2_inode *ip)
|
|
{
|
|
struct gfs2_sbd *sdp = ip->i_sbd;
|
|
struct buffer_head *dibh;
|
|
int error;
|
|
|
|
error = gfs2_trans_begin(sdp, RES_DINODE, 0);
|
|
if (error)
|
|
return error;
|
|
|
|
down_write(&ip->i_rw_mutex);
|
|
|
|
error = gfs2_meta_inode_buffer(ip, &dibh);
|
|
if (error)
|
|
goto out;
|
|
|
|
if (!ip->i_di.di_size) {
|
|
ip->i_di.di_height = 0;
|
|
ip->i_di.di_goal_meta =
|
|
ip->i_di.di_goal_data =
|
|
ip->i_num.no_addr;
|
|
gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
|
|
}
|
|
ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
|
|
ip->i_di.di_flags &= ~GFS2_DIF_TRUNC_IN_PROG;
|
|
|
|
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
|
|
gfs2_dinode_out(&ip->i_di, dibh->b_data);
|
|
brelse(dibh);
|
|
|
|
out:
|
|
up_write(&ip->i_rw_mutex);
|
|
|
|
gfs2_trans_end(sdp);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* do_shrink - make a file smaller
|
|
* @ip: the inode
|
|
* @size: the size to make the file
|
|
* @truncator: function to truncate the last partial block
|
|
*
|
|
* Called with an exclusive lock on @ip.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int do_shrink(struct gfs2_inode *ip, uint64_t size)
|
|
{
|
|
int error;
|
|
|
|
error = trunc_start(ip, size);
|
|
if (error < 0)
|
|
return error;
|
|
if (error > 0)
|
|
return 0;
|
|
|
|
error = trunc_dealloc(ip, size);
|
|
if (!error)
|
|
error = trunc_end(ip);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_truncatei - make a file a given size
|
|
* @ip: the inode
|
|
* @size: the size to make the file
|
|
* @truncator: function to truncate the last partial block
|
|
*
|
|
* The file size can grow, shrink, or stay the same size.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
int gfs2_truncatei(struct gfs2_inode *ip, uint64_t size)
|
|
{
|
|
int error;
|
|
|
|
if (gfs2_assert_warn(ip->i_sbd, S_ISREG(ip->i_di.di_mode)))
|
|
return -EINVAL;
|
|
|
|
if (size > ip->i_di.di_size)
|
|
error = do_grow(ip, size);
|
|
else
|
|
error = do_shrink(ip, size);
|
|
|
|
return error;
|
|
}
|
|
|
|
int gfs2_truncatei_resume(struct gfs2_inode *ip)
|
|
{
|
|
int error;
|
|
error = trunc_dealloc(ip, ip->i_di.di_size);
|
|
if (!error)
|
|
error = trunc_end(ip);
|
|
return error;
|
|
}
|
|
|
|
int gfs2_file_dealloc(struct gfs2_inode *ip)
|
|
{
|
|
return trunc_dealloc(ip, 0);
|
|
}
|
|
|
|
/**
|
|
* gfs2_write_calc_reserv - calculate number of blocks needed to write to a file
|
|
* @ip: the file
|
|
* @len: the number of bytes to be written to the file
|
|
* @data_blocks: returns the number of data blocks required
|
|
* @ind_blocks: returns the number of indirect blocks required
|
|
*
|
|
*/
|
|
|
|
void gfs2_write_calc_reserv(struct gfs2_inode *ip, unsigned int len,
|
|
unsigned int *data_blocks, unsigned int *ind_blocks)
|
|
{
|
|
struct gfs2_sbd *sdp = ip->i_sbd;
|
|
unsigned int tmp;
|
|
|
|
if (gfs2_is_dir(ip)) {
|
|
*data_blocks = DIV_ROUND_UP(len, sdp->sd_jbsize) + 2;
|
|
*ind_blocks = 3 * (sdp->sd_max_jheight - 1);
|
|
} else {
|
|
*data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3;
|
|
*ind_blocks = 3 * (sdp->sd_max_height - 1);
|
|
}
|
|
|
|
for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) {
|
|
tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
|
|
*ind_blocks += tmp;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gfs2_write_alloc_required - figure out if a write will require an allocation
|
|
* @ip: the file being written to
|
|
* @offset: the offset to write to
|
|
* @len: the number of bytes being written
|
|
* @alloc_required: set to 1 if an alloc is required, 0 otherwise
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
int gfs2_write_alloc_required(struct gfs2_inode *ip, uint64_t offset,
|
|
unsigned int len, int *alloc_required)
|
|
{
|
|
struct gfs2_sbd *sdp = ip->i_sbd;
|
|
uint64_t lblock, lblock_stop, dblock;
|
|
uint32_t extlen;
|
|
int new = 0;
|
|
int error = 0;
|
|
|
|
*alloc_required = 0;
|
|
|
|
if (!len)
|
|
return 0;
|
|
|
|
if (gfs2_is_stuffed(ip)) {
|
|
if (offset + len >
|
|
sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode))
|
|
*alloc_required = 1;
|
|
return 0;
|
|
}
|
|
|
|
if (gfs2_is_dir(ip)) {
|
|
unsigned int bsize = sdp->sd_jbsize;
|
|
lblock = offset;
|
|
do_div(lblock, bsize);
|
|
lblock_stop = offset + len + bsize - 1;
|
|
do_div(lblock_stop, bsize);
|
|
} else {
|
|
unsigned int shift = sdp->sd_sb.sb_bsize_shift;
|
|
lblock = offset >> shift;
|
|
lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift;
|
|
}
|
|
|
|
for (; lblock < lblock_stop; lblock += extlen) {
|
|
error = gfs2_extent_map(ip->i_vnode, lblock, &new, &dblock, &extlen);
|
|
if (error)
|
|
return error;
|
|
|
|
if (!dblock) {
|
|
*alloc_required = 1;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|