This removes the extra filldir callback which gfs2 was using to enclose an attempt at readahead for inodes during readdir. The code was too complicated and also hurts performance badly in the case that the getdents64/readdir call isn't being followed by stat() and it wasn't even getting it right all the time when it was. As a result, on my test box an "ls" of a directory containing 250000 files fell from about 7mins (freshly mounted, so nothing cached) to between about 15 to 25 seconds. When the directory content was cached, the time taken fell from about 3mins to about 4 or 5 seconds. Interestingly in the cached case, running "ls -l" once reduced the time taken for subsequent runs of "ls" to about 6 secs even without this patch. Now it turns out that there was a special case of glocks being used for prefetching the metadata, but because of the timeouts for these locks (set to 10 secs) the metadata was being timed out before it was being used and this the prefetch code was constantly trying to prefetch the same data over and over. Calling "ls -l" meant that the inodes were brought into memory and once the inodes are cached, the glocks are not disposed of until the inodes are pushed out of the cache, thus extending the lifetime of the glocks, and thus bringing down the time for subsequent runs of "ls" considerably. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
655 lines
16 KiB
C
655 lines
16 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/pagemap.h>
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#include <linux/uio.h>
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#include <linux/blkdev.h>
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#include <linux/mm.h>
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#include <linux/smp_lock.h>
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#include <linux/fs.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/ext2_fs.h>
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#include <linux/crc32.h>
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#include <linux/lm_interface.h>
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#include <linux/writeback.h>
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#include <asm/uaccess.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "bmap.h"
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#include "dir.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 "lm.h"
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#include "log.h"
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#include "meta_io.h"
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#include "ops_file.h"
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#include "ops_vm.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 "util.h"
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#include "eaops.h"
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/*
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* Most fields left uninitialised to catch anybody who tries to
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* use them. f_flags set to prevent file_accessed() from touching
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* any other part of this. Its use is purely as a flag so that we
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* know (in readpage()) whether or not do to locking.
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*/
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struct file gfs2_internal_file_sentinel = {
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.f_flags = O_NOATIME|O_RDONLY,
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};
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static int gfs2_read_actor(read_descriptor_t *desc, struct page *page,
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unsigned long offset, unsigned long size)
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{
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char *kaddr;
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unsigned long count = desc->count;
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if (size > count)
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size = count;
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kaddr = kmap(page);
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memcpy(desc->arg.data, kaddr + offset, size);
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kunmap(page);
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desc->count = count - size;
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desc->written += size;
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desc->arg.buf += size;
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return size;
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}
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int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state,
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char *buf, loff_t *pos, unsigned size)
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{
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struct inode *inode = &ip->i_inode;
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read_descriptor_t desc;
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desc.written = 0;
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desc.arg.data = buf;
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desc.count = size;
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desc.error = 0;
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do_generic_mapping_read(inode->i_mapping, ra_state,
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&gfs2_internal_file_sentinel, pos, &desc,
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gfs2_read_actor);
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return desc.written ? desc.written : desc.error;
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}
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/**
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* gfs2_llseek - seek to a location in a file
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* @file: the file
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* @offset: the offset
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* @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
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*
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* SEEK_END requires the glock for the file because it references the
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* file's size.
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*
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* Returns: The new offset, or errno
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*/
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static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin)
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{
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struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
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struct gfs2_holder i_gh;
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loff_t error;
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if (origin == 2) {
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error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
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&i_gh);
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if (!error) {
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error = remote_llseek(file, offset, origin);
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gfs2_glock_dq_uninit(&i_gh);
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}
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} else
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error = remote_llseek(file, offset, origin);
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return error;
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}
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/**
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* gfs2_readdir - Read directory entries from a directory
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* @file: The directory to read from
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* @dirent: Buffer for dirents
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* @filldir: Function used to do the copying
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*
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* Returns: errno
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*/
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static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
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{
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struct inode *dir = file->f_mapping->host;
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struct gfs2_inode *dip = GFS2_I(dir);
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struct gfs2_holder d_gh;
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u64 offset = file->f_pos;
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int error;
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gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh);
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error = gfs2_glock_nq_atime(&d_gh);
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if (error) {
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gfs2_holder_uninit(&d_gh);
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return error;
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}
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error = gfs2_dir_read(dir, &offset, dirent, filldir);
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gfs2_glock_dq_uninit(&d_gh);
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file->f_pos = offset;
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return error;
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}
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/**
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* fsflags_cvt
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* @table: A table of 32 u32 flags
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* @val: a 32 bit value to convert
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*
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* This function can be used to convert between fsflags values and
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* GFS2's own flags values.
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*
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* Returns: the converted flags
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*/
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static u32 fsflags_cvt(const u32 *table, u32 val)
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{
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u32 res = 0;
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while(val) {
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if (val & 1)
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res |= *table;
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table++;
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val >>= 1;
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}
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return res;
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}
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static const u32 fsflags_to_gfs2[32] = {
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[3] = GFS2_DIF_SYNC,
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[4] = GFS2_DIF_IMMUTABLE,
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[5] = GFS2_DIF_APPENDONLY,
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[7] = GFS2_DIF_NOATIME,
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[12] = GFS2_DIF_EXHASH,
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[14] = GFS2_DIF_JDATA,
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[20] = GFS2_DIF_DIRECTIO,
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};
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static const u32 gfs2_to_fsflags[32] = {
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[gfs2fl_Sync] = FS_SYNC_FL,
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[gfs2fl_Immutable] = FS_IMMUTABLE_FL,
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[gfs2fl_AppendOnly] = FS_APPEND_FL,
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[gfs2fl_NoAtime] = FS_NOATIME_FL,
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[gfs2fl_ExHash] = FS_INDEX_FL,
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[gfs2fl_Jdata] = FS_JOURNAL_DATA_FL,
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[gfs2fl_Directio] = FS_DIRECTIO_FL,
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[gfs2fl_InheritDirectio] = FS_DIRECTIO_FL,
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[gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
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};
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static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
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{
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struct inode *inode = filp->f_path.dentry->d_inode;
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_holder gh;
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int error;
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u32 fsflags;
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gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh);
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error = gfs2_glock_nq_atime(&gh);
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if (error)
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return error;
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fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_di.di_flags);
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if (put_user(fsflags, ptr))
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error = -EFAULT;
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gfs2_glock_dq_m(1, &gh);
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gfs2_holder_uninit(&gh);
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return error;
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}
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void gfs2_set_inode_flags(struct inode *inode)
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{
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_dinode_host *di = &ip->i_di;
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unsigned int flags = inode->i_flags;
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flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
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if (di->di_flags & GFS2_DIF_IMMUTABLE)
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flags |= S_IMMUTABLE;
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if (di->di_flags & GFS2_DIF_APPENDONLY)
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flags |= S_APPEND;
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if (di->di_flags & GFS2_DIF_NOATIME)
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flags |= S_NOATIME;
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if (di->di_flags & GFS2_DIF_SYNC)
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flags |= S_SYNC;
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inode->i_flags = flags;
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}
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/* Flags that can be set by user space */
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#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
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GFS2_DIF_DIRECTIO| \
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GFS2_DIF_IMMUTABLE| \
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GFS2_DIF_APPENDONLY| \
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GFS2_DIF_NOATIME| \
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GFS2_DIF_SYNC| \
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GFS2_DIF_SYSTEM| \
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GFS2_DIF_INHERIT_DIRECTIO| \
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GFS2_DIF_INHERIT_JDATA)
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/**
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* gfs2_set_flags - set flags on an inode
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* @inode: The inode
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* @flags: The flags to set
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* @mask: Indicates which flags are valid
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*
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*/
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static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
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{
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struct inode *inode = filp->f_path.dentry->d_inode;
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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struct buffer_head *bh;
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struct gfs2_holder gh;
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int error;
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u32 new_flags, flags;
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error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
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if (error)
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return error;
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flags = ip->i_di.di_flags;
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new_flags = (flags & ~mask) | (reqflags & mask);
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if ((new_flags ^ flags) == 0)
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goto out;
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if (S_ISDIR(inode->i_mode)) {
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if ((new_flags ^ flags) & GFS2_DIF_JDATA)
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new_flags ^= (GFS2_DIF_JDATA|GFS2_DIF_INHERIT_JDATA);
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if ((new_flags ^ flags) & GFS2_DIF_DIRECTIO)
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new_flags ^= (GFS2_DIF_DIRECTIO|GFS2_DIF_INHERIT_DIRECTIO);
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}
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error = -EINVAL;
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if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
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goto out;
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error = -EPERM;
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if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
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goto out;
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if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
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goto out;
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if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
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!capable(CAP_LINUX_IMMUTABLE))
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goto out;
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if (!IS_IMMUTABLE(inode)) {
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error = permission(inode, MAY_WRITE, NULL);
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if (error)
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goto out;
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}
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error = gfs2_trans_begin(sdp, RES_DINODE, 0);
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if (error)
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goto out;
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error = gfs2_meta_inode_buffer(ip, &bh);
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if (error)
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goto out_trans_end;
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gfs2_trans_add_bh(ip->i_gl, bh, 1);
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ip->i_di.di_flags = new_flags;
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gfs2_dinode_out(ip, bh->b_data);
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brelse(bh);
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gfs2_set_inode_flags(inode);
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out_trans_end:
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gfs2_trans_end(sdp);
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out:
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gfs2_glock_dq_uninit(&gh);
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return error;
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}
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static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
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{
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u32 fsflags, gfsflags;
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if (get_user(fsflags, ptr))
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return -EFAULT;
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gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
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return do_gfs2_set_flags(filp, gfsflags, ~0);
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}
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static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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switch(cmd) {
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case FS_IOC_GETFLAGS:
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return gfs2_get_flags(filp, (u32 __user *)arg);
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case FS_IOC_SETFLAGS:
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return gfs2_set_flags(filp, (u32 __user *)arg);
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}
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return -ENOTTY;
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}
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/**
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* gfs2_mmap -
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* @file: The file to map
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* @vma: The VMA which described the mapping
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*
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* Returns: 0 or error code
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*/
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static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
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{
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struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
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struct gfs2_holder i_gh;
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int error;
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gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
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error = gfs2_glock_nq_atime(&i_gh);
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if (error) {
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gfs2_holder_uninit(&i_gh);
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return error;
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}
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/* This is VM_MAYWRITE instead of VM_WRITE because a call
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to mprotect() can turn on VM_WRITE later. */
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if ((vma->vm_flags & (VM_MAYSHARE | VM_MAYWRITE)) ==
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(VM_MAYSHARE | VM_MAYWRITE))
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vma->vm_ops = &gfs2_vm_ops_sharewrite;
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else
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vma->vm_ops = &gfs2_vm_ops_private;
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gfs2_glock_dq_uninit(&i_gh);
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return error;
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}
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/**
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* gfs2_open - open a file
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* @inode: the inode to open
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* @file: the struct file for this opening
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*
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* Returns: errno
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*/
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static int gfs2_open(struct inode *inode, struct file *file)
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{
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_holder i_gh;
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struct gfs2_file *fp;
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int error;
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fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
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if (!fp)
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return -ENOMEM;
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mutex_init(&fp->f_fl_mutex);
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gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
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file->private_data = fp;
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if (S_ISREG(ip->i_inode.i_mode)) {
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error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
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&i_gh);
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if (error)
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goto fail;
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if (!(file->f_flags & O_LARGEFILE) &&
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ip->i_di.di_size > MAX_NON_LFS) {
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error = -EFBIG;
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goto fail_gunlock;
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}
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/* Listen to the Direct I/O flag */
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if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO)
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file->f_flags |= O_DIRECT;
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gfs2_glock_dq_uninit(&i_gh);
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}
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return 0;
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fail_gunlock:
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gfs2_glock_dq_uninit(&i_gh);
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fail:
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file->private_data = NULL;
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kfree(fp);
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return error;
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}
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/**
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* gfs2_close - called to close a struct file
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* @inode: the inode the struct file belongs to
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* @file: the struct file being closed
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*
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* Returns: errno
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*/
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static int gfs2_close(struct inode *inode, struct file *file)
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{
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struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
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struct gfs2_file *fp;
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fp = file->private_data;
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file->private_data = NULL;
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if (gfs2_assert_warn(sdp, fp))
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return -EIO;
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kfree(fp);
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return 0;
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}
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/**
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* gfs2_fsync - sync the dirty data for a file (across the cluster)
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* @file: the file that points to the dentry (we ignore this)
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* @dentry: the dentry that points to the inode to sync
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*
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* The VFS will flush "normal" data for us. We only need to worry
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* about metadata here. For journaled data, we just do a log flush
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* as we can't avoid it. Otherwise we can just bale out if datasync
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* is set. For stuffed inodes we must flush the log in order to
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* ensure that all data is on disk.
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*
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* The call to write_inode_now() is there to write back metadata and
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* the inode itself. It does also try and write the data, but thats
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* (hopefully) a no-op due to the VFS having already called filemap_fdatawrite()
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* for us.
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*
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* Returns: errno
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*/
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static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
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{
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struct inode *inode = dentry->d_inode;
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int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
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int ret = 0;
|
|
|
|
if (gfs2_is_jdata(GFS2_I(inode))) {
|
|
gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
|
|
return 0;
|
|
}
|
|
|
|
if (sync_state != 0) {
|
|
if (!datasync)
|
|
ret = write_inode_now(inode, 0);
|
|
|
|
if (gfs2_is_stuffed(GFS2_I(inode)))
|
|
gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gfs2_lock - acquire/release a posix lock on a file
|
|
* @file: the file pointer
|
|
* @cmd: either modify or retrieve lock state, possibly wait
|
|
* @fl: type and range of lock
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
|
|
struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
|
|
struct lm_lockname name =
|
|
{ .ln_number = ip->i_num.no_addr,
|
|
.ln_type = LM_TYPE_PLOCK };
|
|
|
|
if (!(fl->fl_flags & FL_POSIX))
|
|
return -ENOLCK;
|
|
if ((ip->i_inode.i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
|
|
return -ENOLCK;
|
|
|
|
if (sdp->sd_args.ar_localflocks) {
|
|
if (IS_GETLK(cmd)) {
|
|
struct file_lock tmp;
|
|
int ret;
|
|
ret = posix_test_lock(file, fl, &tmp);
|
|
fl->fl_type = F_UNLCK;
|
|
if (ret)
|
|
memcpy(fl, &tmp, sizeof(struct file_lock));
|
|
return 0;
|
|
} else {
|
|
return posix_lock_file_wait(file, fl);
|
|
}
|
|
}
|
|
|
|
if (IS_GETLK(cmd))
|
|
return gfs2_lm_plock_get(sdp, &name, file, fl);
|
|
else if (fl->fl_type == F_UNLCK)
|
|
return gfs2_lm_punlock(sdp, &name, file, fl);
|
|
else
|
|
return gfs2_lm_plock(sdp, &name, file, cmd, fl);
|
|
}
|
|
|
|
static int do_flock(struct file *file, int cmd, struct file_lock *fl)
|
|
{
|
|
struct gfs2_file *fp = file->private_data;
|
|
struct gfs2_holder *fl_gh = &fp->f_fl_gh;
|
|
struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
|
|
struct gfs2_glock *gl;
|
|
unsigned int state;
|
|
int flags;
|
|
int error = 0;
|
|
|
|
state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
|
|
flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
|
|
|
|
mutex_lock(&fp->f_fl_mutex);
|
|
|
|
gl = fl_gh->gh_gl;
|
|
if (gl) {
|
|
if (fl_gh->gh_state == state)
|
|
goto out;
|
|
gfs2_glock_hold(gl);
|
|
flock_lock_file_wait(file,
|
|
&(struct file_lock){.fl_type = F_UNLCK});
|
|
gfs2_glock_dq_uninit(fl_gh);
|
|
} else {
|
|
error = gfs2_glock_get(GFS2_SB(&ip->i_inode),
|
|
ip->i_num.no_addr, &gfs2_flock_glops,
|
|
CREATE, &gl);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
|
|
gfs2_holder_init(gl, state, flags, fl_gh);
|
|
gfs2_glock_put(gl);
|
|
|
|
error = gfs2_glock_nq(fl_gh);
|
|
if (error) {
|
|
gfs2_holder_uninit(fl_gh);
|
|
if (error == GLR_TRYFAILED)
|
|
error = -EAGAIN;
|
|
} else {
|
|
error = flock_lock_file_wait(file, fl);
|
|
gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&fp->f_fl_mutex);
|
|
return error;
|
|
}
|
|
|
|
static void do_unflock(struct file *file, struct file_lock *fl)
|
|
{
|
|
struct gfs2_file *fp = file->private_data;
|
|
struct gfs2_holder *fl_gh = &fp->f_fl_gh;
|
|
|
|
mutex_lock(&fp->f_fl_mutex);
|
|
flock_lock_file_wait(file, fl);
|
|
if (fl_gh->gh_gl)
|
|
gfs2_glock_dq_uninit(fl_gh);
|
|
mutex_unlock(&fp->f_fl_mutex);
|
|
}
|
|
|
|
/**
|
|
* gfs2_flock - acquire/release a flock lock on a file
|
|
* @file: the file pointer
|
|
* @cmd: either modify or retrieve lock state, possibly wait
|
|
* @fl: type and range of lock
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
|
|
struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
|
|
|
|
if (!(fl->fl_flags & FL_FLOCK))
|
|
return -ENOLCK;
|
|
if ((ip->i_inode.i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
|
|
return -ENOLCK;
|
|
|
|
if (sdp->sd_args.ar_localflocks)
|
|
return flock_lock_file_wait(file, fl);
|
|
|
|
if (fl->fl_type == F_UNLCK) {
|
|
do_unflock(file, fl);
|
|
return 0;
|
|
} else {
|
|
return do_flock(file, cmd, fl);
|
|
}
|
|
}
|
|
|
|
const struct file_operations gfs2_file_fops = {
|
|
.llseek = gfs2_llseek,
|
|
.read = do_sync_read,
|
|
.aio_read = generic_file_aio_read,
|
|
.write = do_sync_write,
|
|
.aio_write = generic_file_aio_write,
|
|
.unlocked_ioctl = gfs2_ioctl,
|
|
.mmap = gfs2_mmap,
|
|
.open = gfs2_open,
|
|
.release = gfs2_close,
|
|
.fsync = gfs2_fsync,
|
|
.lock = gfs2_lock,
|
|
.sendfile = generic_file_sendfile,
|
|
.flock = gfs2_flock,
|
|
.splice_read = generic_file_splice_read,
|
|
.splice_write = generic_file_splice_write,
|
|
};
|
|
|
|
const struct file_operations gfs2_dir_fops = {
|
|
.readdir = gfs2_readdir,
|
|
.unlocked_ioctl = gfs2_ioctl,
|
|
.open = gfs2_open,
|
|
.release = gfs2_close,
|
|
.fsync = gfs2_fsync,
|
|
.lock = gfs2_lock,
|
|
.flock = gfs2_flock,
|
|
};
|
|
|