480 lines
11 KiB
C
480 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 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/statfs.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 <linux/lm_interface.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "glock.h"
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#include "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 "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->i_private) {
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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(GFS2_SB(inode), 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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if (!strncmp(sb->s_type->name, "gfs2meta", 8))
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return; /* Nothing to do */
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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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kfree(sdp);
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}
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/**
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* gfs2_write_super
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* @sb: the superblock
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*
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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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sb->s_dirt = 0;
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}
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/**
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* gfs2_sync_fs - sync the filesystem
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* @sb: the superblock
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*
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* Flushes the log to disk.
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*/
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static int gfs2_sync_fs(struct super_block *sb, int wait)
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{
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sb->s_dirt = 0;
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if (wait)
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gfs2_log_flush(sb->s_fs_info, NULL);
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return 0;
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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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gfs2_unfreeze_fs(sb->s_fs_info);
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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 dentry *dentry, struct kstatfs *buf)
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{
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struct super_block *sb = dentry->d_inode->i_sb;
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struct gfs2_sbd *sdp = sb->s_fs_info;
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struct gfs2_statfs_change_host 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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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->i_private) {
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struct gfs2_inode *ip = GFS2_I(inode);
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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->i_private)
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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, &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(inode->i_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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.sync_fs = gfs2_sync_fs,
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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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