/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License version 2.
*/
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/statfs.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/kthread.h>
#include <linux/delay.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
#include <linux/lm_interface.h>
#include "gfs2.h"
#include "incore.h"
#include "glock.h"
#include "inode.h"
#include "lm.h"
#include "log.h"
#include "mount.h"
#include "ops_super.h"
#include "quota.h"
#include "recovery.h"
#include "rgrp.h"
#include "super.h"
#include "sys.h"
#include "util.h"
#include "trans.h"
#include "dir.h"
#include "eattr.h"
#include "bmap.h"
/**
* gfs2_write_inode - Make sure the inode is stable on the disk
* @inode: The inode
* @sync: synchronous write flag
*
* Returns: errno
*/
static int gfs2_write_inode(struct inode *inode, int sync)
{
struct gfs2_inode *ip = GFS2_I(inode);
/* Check this is a "normal" inode */
if (inode->i_private) {
if (current->flags & PF_MEMALLOC)
return 0;
if (sync)
gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
}
return 0;
}
/**
* gfs2_put_super - Unmount the filesystem
* @sb: The VFS superblock
*
*/
static void gfs2_put_super(struct super_block *sb)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
int error;
if (!sdp)
return;
if (!strncmp(sb->s_type->name, "gfs2meta", 8))
return; /* Nothing to do */
/* Unfreeze the filesystem, if we need to */
mutex_lock(&sdp->sd_freeze_lock);
if (sdp->sd_freeze_count)
gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
mutex_unlock(&sdp->sd_freeze_lock);
kthread_stop(sdp->sd_quotad_process);
kthread_stop(sdp->sd_logd_process);
kthread_stop(sdp->sd_recoverd_process);
while (sdp->sd_glockd_num--)
kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
kthread_stop(sdp->sd_scand_process);
if (!(sb->s_flags & MS_RDONLY)) {
error = gfs2_make_fs_ro(sdp);
if (error)
gfs2_io_error(sdp);
}
/* At this point, we're through modifying the disk */
/* Release stuff */
iput(sdp->sd_master_dir);
iput(sdp->sd_jindex);
iput(sdp->sd_inum_inode);
iput(sdp->sd_statfs_inode);
iput(sdp->sd_rindex);
iput(sdp->sd_quota_inode);
gfs2_glock_put(sdp->sd_rename_gl);
gfs2_glock_put(sdp->sd_trans_gl);
if (!sdp->sd_args.ar_spectator) {
gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
iput(sdp->sd_ir_inode);
iput(sdp->sd_sc_inode);
iput(sdp->sd_qc_inode);
}
gfs2_glock_dq_uninit(&sdp->sd_live_gh);
gfs2_clear_rgrpd(sdp);
gfs2_jindex_free(sdp);
/* Take apart glock structures and buffer lists */
gfs2_gl_hash_clear(sdp, WAIT);
/* Unmount the locking protocol */
gfs2_lm_unmount(sdp);
/* At this point, we're through participating in the lockspace */
gfs2_sys_fs_del(sdp);
kfree(sdp);
}
/**
* gfs2_write_super
* @sb: the superblock
*
*/
static void gfs2_write_super(struct super_block *sb)
{
sb->s_dirt = 0;
}
/**
* gfs2_sync_fs - sync the filesystem
* @sb: the superblock
*
* Flushes the log to disk.
*/
static int gfs2_sync_fs(struct super_block *sb, int wait)
{
sb->s_dirt = 0;
gfs2_log_flush(sb->s_fs_info, NULL);
return 0;
}
/**
* gfs2_write_super_lockfs - prevent further writes to the filesystem
* @sb: the VFS structure for the filesystem
*
*/
static void gfs2_write_super_lockfs(struct super_block *sb)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
int error;
for (;;) {
error = gfs2_freeze_fs(sdp);
if (!error)
break;
switch (error) {
case -EBUSY:
fs_err(sdp, "waiting for recovery before freeze\n");
break;
default:
fs_err(sdp, "error freezing FS: %d\n", error);
break;
}
fs_err(sdp, "retrying...\n");
msleep(1000);
}
}
/**
* gfs2_unlockfs - reallow writes to the filesystem
* @sb: the VFS structure for the filesystem
*
*/
static void gfs2_unlockfs(struct super_block *sb)
{
gfs2_unfreeze_fs(sb->s_fs_info);
}
/**
* gfs2_statfs - Gather and return stats about the filesystem
* @sb: The superblock
* @statfsbuf: The buffer
*
* Returns: 0 on success or error code
*/
static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct super_block *sb = dentry->d_inode->i_sb;
struct gfs2_sbd *sdp = sb->s_fs_info;
struct gfs2_statfs_change sc;
int error;
if (gfs2_tune_get(sdp, gt_statfs_slow))
error = gfs2_statfs_slow(sdp, &sc);
else
error = gfs2_statfs_i(sdp, &sc);
if (error)
return error;
buf->f_type = GFS2_MAGIC;
buf->f_bsize = sdp->sd_sb.sb_bsize;
buf->f_blocks = sc.sc_total;
buf->f_bfree = sc.sc_free;
buf->f_bavail = sc.sc_free;
buf->f_files = sc.sc_dinodes + sc.sc_free;
buf->f_ffree = sc.sc_free;
buf->f_namelen = GFS2_FNAMESIZE;
return 0;
}
/**
* gfs2_remount_fs - called when the FS is remounted
* @sb: the filesystem
* @flags: the remount flags
* @data: extra data passed in (not used right now)
*
* Returns: errno
*/
static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
int error;
error = gfs2_mount_args(sdp, data, 1);
if (error)
return error;
if (sdp->sd_args.ar_spectator)
*flags |= MS_RDONLY;
else {
if (*flags & MS_RDONLY) {
if (!(sb->s_flags & MS_RDONLY))
error = gfs2_make_fs_ro(sdp);
} else if (!(*flags & MS_RDONLY) &&
(sb->s_flags & MS_RDONLY)) {
error = gfs2_make_fs_rw(sdp);
}
}
if (*flags & (MS_NOATIME | MS_NODIRATIME))
set_bit(SDF_NOATIME, &sdp->sd_flags);
else
clear_bit(SDF_NOATIME, &sdp->sd_flags);
/* Don't let the VFS update atimes. GFS2 handles this itself. */
*flags |= MS_NOATIME | MS_NODIRATIME;
return error;
}
/**
* gfs2_clear_inode - Deallocate an inode when VFS is done with it
* @inode: The VFS inode
*
*/
static void gfs2_clear_inode(struct inode *inode)
{
/* This tells us its a "real" inode and not one which only
* serves to contain an address space (see rgrp.c, meta_io.c)
* which therefore doesn't have its own glocks.
*/
if (inode->i_private) {
struct gfs2_inode *ip = GFS2_I(inode);
gfs2_glock_inode_squish(inode);
gfs2_assert(inode->i_sb->s_fs_info, ip->i_gl->gl_state == LM_ST_UNLOCKED);
ip->i_gl->gl_object = NULL;
gfs2_glock_schedule_for_reclaim(ip->i_gl);
gfs2_glock_put(ip->i_gl);
ip->i_gl = NULL;
if (ip->i_iopen_gh.gh_gl)
gfs2_glock_dq_uninit(&ip->i_iopen_gh);
}
}
/**
* gfs2_show_options - Show mount options for /proc/mounts
* @s: seq_file structure
* @mnt: vfsmount
*
* Returns: 0 on success or error code
*/
static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
{
struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
struct gfs2_args *args = &sdp->sd_args;
if (args->ar_lockproto[0])
seq_printf(s, ",lockproto=%s", args->ar_lockproto);
if (args->ar_locktable[0])
seq_printf(s, ",locktable=%s", args->ar_locktable);
if (args->ar_hostdata[0])
seq_printf(s, ",hostdata=%s", args->ar_hostdata);
if (args->ar_spectator)
seq_printf(s, ",spectator");
if (args->ar_ignore_local_fs)
seq_printf(s, ",ignore_local_fs");
if (args->ar_localflocks)
seq_printf(s, ",localflocks");
if (args->ar_localcaching)
seq_printf(s, ",localcaching");
if (args->ar_debug)
seq_printf(s, ",debug");
if (args->ar_upgrade)
seq_printf(s, ",upgrade");
if (args->ar_num_glockd != GFS2_GLOCKD_DEFAULT)
seq_printf(s, ",num_glockd=%u", args->ar_num_glockd);
if (args->ar_posix_acl)
seq_printf(s, ",acl");
if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
char *state;
switch (args->ar_quota) {
case GFS2_QUOTA_OFF:
state = "off";
break;
case GFS2_QUOTA_ACCOUNT:
state = "account";
break;
case GFS2_QUOTA_ON:
state = "on";
break;
default:
state = "unknown";
break;
}
seq_printf(s, ",quota=%s", state);
}
if (args->ar_suiddir)
seq_printf(s, ",suiddir");
if (args->ar_data != GFS2_DATA_DEFAULT) {
char *state;
switch (args->ar_data) {
case GFS2_DATA_WRITEBACK:
state = "writeback";
break;
case GFS2_DATA_ORDERED:
state = "ordered";
break;
default:
state = "unknown";
break;
}
seq_printf(s, ",data=%s", state);
}
return 0;
}
/*
* We have to (at the moment) hold the inodes main lock to cover
* the gap between unlocking the shared lock on the iopen lock and
* taking the exclusive lock. I'd rather do a shared -> exclusive
* conversion on the iopen lock, but we can change that later. This
* is safe, just less efficient.
*/
static void gfs2_delete_inode(struct inode *inode)
{
struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_holder gh;
int error;
if (!inode->i_private)
goto out;
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &gh);
if (unlikely(error)) {
gfs2_glock_dq_uninit(&ip->i_iopen_gh);
goto out;
}
gfs2_glock_dq(&ip->i_iopen_gh);
gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
error = gfs2_glock_nq(&ip->i_iopen_gh);
if (error)
goto out_uninit;
if (S_ISDIR(ip->i_di.di_mode) &&
(ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
error = gfs2_dir_exhash_dealloc(ip);
if (error)
goto out_unlock;
}
if (ip->i_di.di_eattr) {
error = gfs2_ea_dealloc(ip);
if (error)
goto out_unlock;
}
if (!gfs2_is_stuffed(ip)) {
error = gfs2_file_dealloc(ip);
if (error)
goto out_unlock;
}
error = gfs2_dinode_dealloc(ip);
out_unlock:
gfs2_glock_dq(&ip->i_iopen_gh);
out_uninit:
gfs2_holder_uninit(&ip->i_iopen_gh);
gfs2_glock_dq_uninit(&gh);
if (error)
fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
out:
truncate_inode_pages(&inode->i_data, 0);
clear_inode(inode);
}
static struct inode *gfs2_alloc_inode(struct super_block *sb)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
struct gfs2_inode *ip;
ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
if (ip) {
ip->i_flags = 0;
ip->i_gl = NULL;
ip->i_greedy = gfs2_tune_get(sdp, gt_greedy_default);
ip->i_last_pfault = jiffies;
}
return &ip->i_inode;
}
static void gfs2_destroy_inode(struct inode *inode)
{
kmem_cache_free(gfs2_inode_cachep, inode);
}
struct super_operations gfs2_super_ops = {
.alloc_inode = gfs2_alloc_inode,
.destroy_inode = gfs2_destroy_inode,
.write_inode = gfs2_write_inode,
.delete_inode = gfs2_delete_inode,
.put_super = gfs2_put_super,
.write_super = gfs2_write_super,
.sync_fs = gfs2_sync_fs,
.write_super_lockfs = gfs2_write_super_lockfs,
.unlockfs = gfs2_unlockfs,
.statfs = gfs2_statfs,
.remount_fs = gfs2_remount_fs,
.clear_inode = gfs2_clear_inode,
.show_options = gfs2_show_options,
};
