feaa7bba02
This patch fixes the way we have been dealing with unlinked, but still open files. It removes all limits (other than memory for inodes, as per every other filesystem) on numbers of these which we can support on GFS2. It also means that (like other fs) its the responsibility of the last process to close the file to deallocate the storage, rather than the person who did the unlinking. Note that with GFS2, those two events might take place on different nodes. Also there are a number of other changes: o We use the Linux inode subsystem as it was intended to be used, wrt allocating GFS2 inodes o The Linux inode cache is now the point which we use for local enforcement of only holding one copy of the inode in core at once (previous to this we used the glock layer). o We no longer use the unlinked "special" file. We just ignore it completely. This makes unlinking more efficient. o We now use the 4th block allocation state. The previously unused state is used to track unlinked but still open inodes. o gfs2_inoded is no longer needed o Several fields are now no longer needed (and removed) from the in core struct gfs2_inode o Several fields are no longer needed (and removed) from the in core superblock There are a number of future possible optimisations and clean ups which have been made possible by this patch. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
472 lines
11 KiB
C
472 lines
11 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/statfs.h>
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#include <linux/vmalloc.h>
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#include <linux/seq_file.h>
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#include <linux/mount.h>
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#include <linux/kthread.h>
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#include <linux/delay.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/crc32.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 "glock.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 "mount.h"
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#include "ops_super.h"
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#include "page.h"
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#include "quota.h"
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#include "recovery.h"
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#include "rgrp.h"
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#include "super.h"
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#include "sys.h"
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#include "util.h"
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#include "trans.h"
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#include "dir.h"
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#include "eattr.h"
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#include "bmap.h"
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/**
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* gfs2_write_inode - Make sure the inode is stable on the disk
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* @inode: The inode
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* @sync: synchronous write flag
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*
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* Returns: errno
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*/
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static int gfs2_write_inode(struct inode *inode, int sync)
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{
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struct gfs2_inode *ip = GFS2_I(inode);
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/* Check this is a "normal" inode */
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if (inode->u.generic_ip) {
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if (current->flags & PF_MEMALLOC)
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return 0;
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if (sync)
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gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
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}
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return 0;
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}
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/**
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* gfs2_put_super - Unmount the filesystem
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* @sb: The VFS superblock
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*
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*/
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static void gfs2_put_super(struct super_block *sb)
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{
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struct gfs2_sbd *sdp = sb->s_fs_info;
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int error;
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if (!sdp)
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return;
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/* Unfreeze the filesystem, if we need to */
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mutex_lock(&sdp->sd_freeze_lock);
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if (sdp->sd_freeze_count)
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gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
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mutex_unlock(&sdp->sd_freeze_lock);
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kthread_stop(sdp->sd_quotad_process);
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kthread_stop(sdp->sd_logd_process);
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kthread_stop(sdp->sd_recoverd_process);
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while (sdp->sd_glockd_num--)
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kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
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kthread_stop(sdp->sd_scand_process);
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if (!(sb->s_flags & MS_RDONLY)) {
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error = gfs2_make_fs_ro(sdp);
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if (error)
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gfs2_io_error(sdp);
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}
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/* At this point, we're through modifying the disk */
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/* Release stuff */
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iput(sdp->sd_master_dir);
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iput(sdp->sd_jindex);
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iput(sdp->sd_inum_inode);
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iput(sdp->sd_statfs_inode);
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iput(sdp->sd_rindex);
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iput(sdp->sd_quota_inode);
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gfs2_glock_put(sdp->sd_rename_gl);
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gfs2_glock_put(sdp->sd_trans_gl);
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if (!sdp->sd_args.ar_spectator) {
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gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
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gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
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gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
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gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
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gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
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iput(sdp->sd_ir_inode);
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iput(sdp->sd_sc_inode);
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iput(sdp->sd_qc_inode);
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}
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gfs2_glock_dq_uninit(&sdp->sd_live_gh);
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gfs2_clear_rgrpd(sdp);
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gfs2_jindex_free(sdp);
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/* Take apart glock structures and buffer lists */
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gfs2_gl_hash_clear(sdp, WAIT);
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/* Unmount the locking protocol */
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gfs2_lm_unmount(sdp);
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/* At this point, we're through participating in the lockspace */
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gfs2_sys_fs_del(sdp);
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vfree(sdp);
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sb->s_fs_info = NULL;
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}
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/**
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* gfs2_write_super - disk commit all incore transactions
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* @sb: the filesystem
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*
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* This function is called every time sync(2) is called.
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* After this exits, all dirty buffers are synced.
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*/
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static void gfs2_write_super(struct super_block *sb)
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{
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struct gfs2_sbd *sdp = sb->s_fs_info;
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gfs2_log_flush(sdp, NULL);
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}
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/**
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* gfs2_write_super_lockfs - prevent further writes to the filesystem
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* @sb: the VFS structure for the filesystem
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*
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*/
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static void gfs2_write_super_lockfs(struct super_block *sb)
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{
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struct gfs2_sbd *sdp = sb->s_fs_info;
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int error;
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for (;;) {
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error = gfs2_freeze_fs(sdp);
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if (!error)
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break;
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switch (error) {
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case -EBUSY:
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fs_err(sdp, "waiting for recovery before freeze\n");
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break;
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default:
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fs_err(sdp, "error freezing FS: %d\n", error);
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break;
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}
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fs_err(sdp, "retrying...\n");
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msleep(1000);
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}
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}
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/**
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* gfs2_unlockfs - reallow writes to the filesystem
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* @sb: the VFS structure for the filesystem
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*
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*/
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static void gfs2_unlockfs(struct super_block *sb)
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{
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struct gfs2_sbd *sdp = sb->s_fs_info;
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gfs2_unfreeze_fs(sdp);
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}
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/**
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* gfs2_statfs - Gather and return stats about the filesystem
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* @sb: The superblock
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* @statfsbuf: The buffer
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*
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* Returns: 0 on success or error code
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*/
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static int gfs2_statfs(struct super_block *sb, struct kstatfs *buf)
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{
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struct gfs2_sbd *sdp = sb->s_fs_info;
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struct gfs2_statfs_change sc;
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int error;
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if (gfs2_tune_get(sdp, gt_statfs_slow))
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error = gfs2_statfs_slow(sdp, &sc);
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else
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error = gfs2_statfs_i(sdp, &sc);
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if (error)
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return error;
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memset(buf, 0, sizeof(struct kstatfs));
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buf->f_type = GFS2_MAGIC;
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buf->f_bsize = sdp->sd_sb.sb_bsize;
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buf->f_blocks = sc.sc_total;
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buf->f_bfree = sc.sc_free;
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buf->f_bavail = sc.sc_free;
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buf->f_files = sc.sc_dinodes + sc.sc_free;
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buf->f_ffree = sc.sc_free;
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buf->f_namelen = GFS2_FNAMESIZE;
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return 0;
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}
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/**
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* gfs2_remount_fs - called when the FS is remounted
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* @sb: the filesystem
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* @flags: the remount flags
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* @data: extra data passed in (not used right now)
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*
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* Returns: errno
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*/
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static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
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{
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struct gfs2_sbd *sdp = sb->s_fs_info;
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int error;
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error = gfs2_mount_args(sdp, data, 1);
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if (error)
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return error;
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if (sdp->sd_args.ar_spectator)
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*flags |= MS_RDONLY;
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else {
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if (*flags & MS_RDONLY) {
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if (!(sb->s_flags & MS_RDONLY))
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error = gfs2_make_fs_ro(sdp);
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} else if (!(*flags & MS_RDONLY) &&
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(sb->s_flags & MS_RDONLY)) {
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error = gfs2_make_fs_rw(sdp);
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}
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}
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if (*flags & (MS_NOATIME | MS_NODIRATIME))
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set_bit(SDF_NOATIME, &sdp->sd_flags);
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else
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clear_bit(SDF_NOATIME, &sdp->sd_flags);
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/* Don't let the VFS update atimes. GFS2 handles this itself. */
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*flags |= MS_NOATIME | MS_NODIRATIME;
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return error;
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}
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/**
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* gfs2_clear_inode - Deallocate an inode when VFS is done with it
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* @inode: The VFS inode
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*
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*/
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static void gfs2_clear_inode(struct inode *inode)
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{
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/* This tells us its a "real" inode and not one which only
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* serves to contain an address space (see rgrp.c, meta_io.c)
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* which therefore doesn't have its own glocks.
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*/
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if (inode->u.generic_ip) {
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struct gfs2_inode *ip = GFS2_I(inode);
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gfs2_glock_inode_squish(inode);
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gfs2_assert(inode->i_sb->s_fs_info, ip->i_gl->gl_state == LM_ST_UNLOCKED);
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ip->i_gl->gl_object = NULL;
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gfs2_glock_schedule_for_reclaim(ip->i_gl);
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gfs2_glock_put(ip->i_gl);
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ip->i_gl = NULL;
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if (ip->i_iopen_gh.gh_gl)
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gfs2_glock_dq_uninit(&ip->i_iopen_gh);
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}
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}
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/**
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* gfs2_show_options - Show mount options for /proc/mounts
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* @s: seq_file structure
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* @mnt: vfsmount
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*
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* Returns: 0 on success or error code
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*/
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static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
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{
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struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
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struct gfs2_args *args = &sdp->sd_args;
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if (args->ar_lockproto[0])
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seq_printf(s, ",lockproto=%s", args->ar_lockproto);
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if (args->ar_locktable[0])
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seq_printf(s, ",locktable=%s", args->ar_locktable);
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if (args->ar_hostdata[0])
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seq_printf(s, ",hostdata=%s", args->ar_hostdata);
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if (args->ar_spectator)
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seq_printf(s, ",spectator");
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if (args->ar_ignore_local_fs)
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seq_printf(s, ",ignore_local_fs");
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if (args->ar_localflocks)
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seq_printf(s, ",localflocks");
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if (args->ar_localcaching)
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seq_printf(s, ",localcaching");
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if (args->ar_debug)
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seq_printf(s, ",debug");
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if (args->ar_upgrade)
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seq_printf(s, ",upgrade");
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if (args->ar_num_glockd != GFS2_GLOCKD_DEFAULT)
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seq_printf(s, ",num_glockd=%u", args->ar_num_glockd);
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if (args->ar_posix_acl)
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seq_printf(s, ",acl");
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if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
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char *state;
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switch (args->ar_quota) {
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case GFS2_QUOTA_OFF:
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state = "off";
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break;
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case GFS2_QUOTA_ACCOUNT:
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state = "account";
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break;
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case GFS2_QUOTA_ON:
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state = "on";
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break;
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default:
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state = "unknown";
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break;
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}
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seq_printf(s, ",quota=%s", state);
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}
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if (args->ar_suiddir)
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seq_printf(s, ",suiddir");
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if (args->ar_data != GFS2_DATA_DEFAULT) {
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char *state;
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switch (args->ar_data) {
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case GFS2_DATA_WRITEBACK:
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state = "writeback";
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break;
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case GFS2_DATA_ORDERED:
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state = "ordered";
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break;
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default:
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state = "unknown";
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break;
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}
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seq_printf(s, ",data=%s", state);
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}
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return 0;
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}
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/*
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* We have to (at the moment) hold the inodes main lock to cover
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* the gap between unlocking the shared lock on the iopen lock and
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* taking the exclusive lock. I'd rather do a shared -> exclusive
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* conversion on the iopen lock, but we can change that later. This
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* is safe, just less efficient.
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*/
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static void gfs2_delete_inode(struct inode *inode)
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{
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struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
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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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if (!inode->u.generic_ip)
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goto out;
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error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &gh);
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if (unlikely(error)) {
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gfs2_glock_dq_uninit(&ip->i_iopen_gh);
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goto out;
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}
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gfs2_glock_dq(&ip->i_iopen_gh);
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gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
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error = gfs2_glock_nq(&ip->i_iopen_gh);
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if (error)
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goto out_uninit;
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if (S_ISDIR(ip->i_di.di_mode) &&
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(ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
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error = gfs2_dir_exhash_dealloc(ip);
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if (error)
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goto out_unlock;
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}
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if (ip->i_di.di_eattr) {
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error = gfs2_ea_dealloc(ip);
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if (error)
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goto out_unlock;
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}
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if (!gfs2_is_stuffed(ip)) {
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error = gfs2_file_dealloc(ip);
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if (error)
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goto out_unlock;
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}
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error = gfs2_dinode_dealloc(ip);
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out_unlock:
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gfs2_glock_dq(&ip->i_iopen_gh);
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out_uninit:
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gfs2_holder_uninit(&ip->i_iopen_gh);
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gfs2_glock_dq_uninit(&gh);
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if (error)
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fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
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out:
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truncate_inode_pages(&inode->i_data, 0);
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clear_inode(inode);
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}
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static struct inode *gfs2_alloc_inode(struct super_block *sb)
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{
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struct gfs2_sbd *sdp = sb->s_fs_info;
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struct gfs2_inode *ip;
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ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
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if (ip) {
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ip->i_flags = 0;
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ip->i_gl = NULL;
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ip->i_greedy = gfs2_tune_get(sdp, gt_greedy_default);
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ip->i_last_pfault = jiffies;
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}
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return &ip->i_inode;
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}
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static void gfs2_destroy_inode(struct inode *inode)
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{
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kmem_cache_free(gfs2_inode_cachep, inode);
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}
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struct super_operations gfs2_super_ops = {
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.alloc_inode = gfs2_alloc_inode,
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.destroy_inode = gfs2_destroy_inode,
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.write_inode = gfs2_write_inode,
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.delete_inode = gfs2_delete_inode,
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.put_super = gfs2_put_super,
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.write_super = gfs2_write_super,
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.write_super_lockfs = gfs2_write_super_lockfs,
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.unlockfs = gfs2_unlockfs,
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.statfs = gfs2_statfs,
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.remount_fs = gfs2_remount_fs,
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.clear_inode = gfs2_clear_inode,
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.show_options = gfs2_show_options,
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};
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