[linux.git] / fs / gfs2 / ops_super.c

/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2008 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 "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 (test_bit(GIF_USER, &ip->i_flags)) {
		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]);

	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);
	/*  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;
	if (wait && sb->s_fs_info)
		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;

	if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
		return;

	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_host 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_drop_inode - Drop an inode (test for remote unlink)
 * @inode: The inode to drop
 *
 * If we've received a callback on an iopen lock then its because a
 * remote node tried to deallocate the inode but failed due to this node
 * still having the inode open. Here we mark the link count zero
 * since we know that it must have reached zero if the GLF_DEMOTE flag
 * is set on the iopen glock. If we didn't do a disk read since the
 * remote node removed the final link then we might otherwise miss
 * this event. This check ensures that this node will deallocate the
 * inode's blocks, or alternatively pass the baton on to another
 * node for later deallocation.
 */
static void gfs2_drop_inode(struct inode *inode)
{
	struct gfs2_inode *ip = GFS2_I(inode);

	if (test_bit(GIF_USER, &ip->i_flags) && inode->i_nlink) {
		struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
		if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
			clear_nlink(inode);
	}
	generic_drop_inode(inode);
}

/**
 * gfs2_clear_inode - Deallocate an inode when VFS is done with it
 * @inode: The VFS inode
 *
 */

static void gfs2_clear_inode(struct inode *inode)
{
	struct gfs2_inode *ip = GFS2_I(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 (test_bit(GIF_USER, &ip->i_flags)) {
		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) {
			ip->i_iopen_gh.gh_gl->gl_object = NULL;
			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 (!test_bit(GIF_USER, &ip->i_flags))
		goto out;

	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
	if (unlikely(error)) {
		gfs2_glock_dq_uninit(&ip->i_iopen_gh);
		goto out;
	}

	gfs2_glock_dq_wait(&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(inode->i_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);
	if (error)
		goto out_unlock;

	error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
	if (error)
		goto out_unlock;
	/* Needs to be done before glock release & also in a transaction */
	truncate_inode_pages(&inode->i_data, 0);
	gfs2_trans_end(sdp);

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 && error != GLR_TRYFAILED)
		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_inode *ip;

	ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
	if (ip) {
		ip->i_flags = 0;
		ip->i_gl = NULL;
	}
	return &ip->i_inode;
}

static void gfs2_destroy_inode(struct inode *inode)
{
	kmem_cache_free(gfs2_inode_cachep, inode);
}

const 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,
	.drop_inode		= gfs2_drop_inode,
	.show_options		= gfs2_show_options,
};
Commit	Line	Data
b3b94faa DT	1	/*
b3b94faa DT	2	* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
091806ed	3	* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
b3b94faa DT	4	*
	5	* This copyrighted material is made available to anyone wishing to use,
	6	* modify, copy, or redistribute it subject to the terms and conditions
e9fc2aa0	7	* of the GNU General Public License version 2.
b3b94faa DT	8	*/
	9
	10	#include <linux/sched.h>
	11	#include <linux/slab.h>
	12	#include <linux/spinlock.h>
	13	#include <linux/completion.h>
	14	#include <linux/buffer_head.h>
b3b94faa DT	15	#include <linux/statfs.h>
	16	#include <linux/seq_file.h>
	17	#include <linux/mount.h>
	18	#include <linux/kthread.h>
	19	#include <linux/delay.h>
5c676f6d	20	#include <linux/gfs2_ondisk.h>
feaa7bba	21	#include <linux/crc32.h>
7d308590	22	#include <linux/lm_interface.h>
b3b94faa DT	23
b3b94faa DT	24	#include "gfs2.h"
5c676f6d	25	#include "incore.h"
b3b94faa DT	26	#include "glock.h"
b3b94faa DT	27	#include "inode.h"
b3b94faa DT	28	#include "log.h"
	29	#include "mount.h"
	30	#include "ops_super.h"
b3b94faa DT	31	#include "quota.h"
	32	#include "recovery.h"
	33	#include "rgrp.h"
	34	#include "super.h"
	35	#include "sys.h"
5c676f6d	36	#include "util.h"
feaa7bba SW	37	#include "trans.h"
	38	#include "dir.h"
	39	#include "eattr.h"
	40	#include "bmap.h"
b3b94faa DT	41
	42	/**
	43	* gfs2_write_inode - Make sure the inode is stable on the disk
	44	* @inode: The inode
	45	* @sync: synchronous write flag
	46	*
	47	* Returns: errno
	48	*/
	49
	50	static int gfs2_write_inode(struct inode *inode, int sync)
	51	{
feaa7bba SW	52	struct gfs2_inode *ip = GFS2_I(inode);
	53
	54	/* Check this is a "normal" inode */
091806ed	55	if (test_bit(GIF_USER, &ip->i_flags)) {
feaa7bba SW	56	if (current->flags & PF_MEMALLOC)
	57	return 0;
	58	if (sync)
3a8476dd	59	gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
feaa7bba	60	}
b3b94faa DT	61
	62	return 0;
	63	}
	64
	65	/**
	66	* gfs2_put_super - Unmount the filesystem
	67	* @sb: The VFS superblock
	68	*
	69	*/
	70
	71	static void gfs2_put_super(struct super_block *sb)
	72	{
5c676f6d	73	struct gfs2_sbd *sdp = sb->s_fs_info;
b3b94faa DT	74	int error;
	75
	76	if (!sdp)
	77	return;
	78
86384605	79	if (!strncmp(sb->s_type->name, "gfs2meta", 8))
5acd3967	80	return; /* Nothing to do */
86384605	81
b3b94faa DT	82	/* Unfreeze the filesystem, if we need to */
b3b94faa DT	83
f55ab26a	84	mutex_lock(&sdp->sd_freeze_lock);
b3b94faa DT	85	if (sdp->sd_freeze_count)
b3b94faa DT	86	gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
f55ab26a	87	mutex_unlock(&sdp->sd_freeze_lock);
b3b94faa	88
b3b94faa DT	89	kthread_stop(sdp->sd_quotad_process);
	90	kthread_stop(sdp->sd_logd_process);
	91	kthread_stop(sdp->sd_recoverd_process);
	92	while (sdp->sd_glockd_num--)
	93	kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
b3b94faa DT	94
	95	if (!(sb->s_flags & MS_RDONLY)) {
	96	error = gfs2_make_fs_ro(sdp);
	97	if (error)
	98	gfs2_io_error(sdp);
	99	}
b3b94faa DT	100	/* At this point, we're through modifying the disk */
	101
	102	/* Release stuff */
	103
f42faf4f SW	104	iput(sdp->sd_master_dir);
	105	iput(sdp->sd_jindex);
	106	iput(sdp->sd_inum_inode);
	107	iput(sdp->sd_statfs_inode);
	108	iput(sdp->sd_rindex);
	109	iput(sdp->sd_quota_inode);
b3b94faa DT	110
	111	gfs2_glock_put(sdp->sd_rename_gl);
	112	gfs2_glock_put(sdp->sd_trans_gl);
	113
	114	if (!sdp->sd_args.ar_spectator) {
	115	gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
	116	gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
	117	gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
	118	gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
b3b94faa	119	gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
f42faf4f SW	120	iput(sdp->sd_ir_inode);
f42faf4f SW	121	iput(sdp->sd_sc_inode);
f42faf4f	122	iput(sdp->sd_qc_inode);
b3b94faa DT	123	}
	124
	125	gfs2_glock_dq_uninit(&sdp->sd_live_gh);
b3b94faa DT	126	gfs2_clear_rgrpd(sdp);
b3b94faa DT	127	gfs2_jindex_free(sdp);
b3b94faa	128	/* Take apart glock structures and buffer lists */
1bdad606	129	gfs2_gl_hash_clear(sdp);
b3b94faa DT	130	/* Unmount the locking protocol */
	131	gfs2_lm_unmount(sdp);
	132
	133	/* At this point, we're through participating in the lockspace */
b3b94faa	134	gfs2_sys_fs_del(sdp);
ff6af411	135	kfree(sdp);
b3b94faa DT	136	}
	137
	138	/**
4a221953 SW	139	* gfs2_write_super
4a221953 SW	140	* @sb: the superblock
b3b94faa	141	*
b3b94faa DT	142	*/
	143
	144	static void gfs2_write_super(struct super_block *sb)
	145	{
4a221953 SW	146	sb->s_dirt = 0;
	147	}
	148
	149	/**
	150	* gfs2_sync_fs - sync the filesystem
	151	* @sb: the superblock
	152	*
	153	* Flushes the log to disk.
	154	*/
	155	static int gfs2_sync_fs(struct super_block *sb, int wait)
	156	{
	157	sb->s_dirt = 0;
9171f5a9	158	if (wait && sb->s_fs_info)
b004157a	159	gfs2_log_flush(sb->s_fs_info, NULL);
4a221953	160	return 0;
b3b94faa DT	161	}
	162
	163	/**
	164	* gfs2_write_super_lockfs - prevent further writes to the filesystem
	165	* @sb: the VFS structure for the filesystem
	166	*
	167	*/
	168
	169	static void gfs2_write_super_lockfs(struct super_block *sb)
	170	{
5c676f6d	171	struct gfs2_sbd *sdp = sb->s_fs_info;
b3b94faa DT	172	int error;
b3b94faa DT	173
c3780511 DT	174	if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
	175	return;
	176
b3b94faa DT	177	for (;;) {
	178	error = gfs2_freeze_fs(sdp);
	179	if (!error)
	180	break;
	181
	182	switch (error) {
	183	case -EBUSY:
	184	fs_err(sdp, "waiting for recovery before freeze\n");
	185	break;
	186
	187	default:
	188	fs_err(sdp, "error freezing FS: %d\n", error);
	189	break;
	190	}
	191
	192	fs_err(sdp, "retrying...\n");
	193	msleep(1000);
	194	}
	195	}
	196
	197	/**
	198	* gfs2_unlockfs - reallow writes to the filesystem
	199	* @sb: the VFS structure for the filesystem
	200	*
	201	*/
	202
	203	static void gfs2_unlockfs(struct super_block *sb)
	204	{
2bdbc5d7	205	gfs2_unfreeze_fs(sb->s_fs_info);
b3b94faa DT	206	}
	207
	208	/**
	209	* gfs2_statfs - Gather and return stats about the filesystem
	210	* @sb: The superblock
	211	* @statfsbuf: The buffer
	212	*
	213	* Returns: 0 on success or error code
	214	*/
	215
0c0834a3	216	static int gfs2_statfs(struct dentry dentry, struct kstatfs buf)
b3b94faa	217	{
0c0834a3	218	struct super_block *sb = dentry->d_inode->i_sb;
5c676f6d	219	struct gfs2_sbd *sdp = sb->s_fs_info;
bd209cc0	220	struct gfs2_statfs_change_host sc;
b3b94faa DT	221	int error;
b3b94faa DT	222
b3b94faa DT	223	if (gfs2_tune_get(sdp, gt_statfs_slow))
	224	error = gfs2_statfs_slow(sdp, &sc);
	225	else
	226	error = gfs2_statfs_i(sdp, &sc);
	227
	228	if (error)
	229	return error;
	230
b3b94faa DT	231	buf->f_type = GFS2_MAGIC;
	232	buf->f_bsize = sdp->sd_sb.sb_bsize;
	233	buf->f_blocks = sc.sc_total;
	234	buf->f_bfree = sc.sc_free;
	235	buf->f_bavail = sc.sc_free;
	236	buf->f_files = sc.sc_dinodes + sc.sc_free;
	237	buf->f_ffree = sc.sc_free;
	238	buf->f_namelen = GFS2_FNAMESIZE;
	239
	240	return 0;
	241	}
	242
	243	/**
	244	* gfs2_remount_fs - called when the FS is remounted
	245	* @sb: the filesystem
	246	* @flags: the remount flags
	247	* @data: extra data passed in (not used right now)
	248	*
	249	* Returns: errno
	250	*/
	251
	252	static int gfs2_remount_fs(struct super_block sb, int flags, char *data)
	253	{
5c676f6d	254	struct gfs2_sbd *sdp = sb->s_fs_info;
b3b94faa DT	255	int error;
b3b94faa DT	256
b3b94faa DT	257	error = gfs2_mount_args(sdp, data, 1);
	258	if (error)
	259	return error;
	260
	261	if (sdp->sd_args.ar_spectator)
	262	*flags \|= MS_RDONLY;
	263	else {
	264	if (*flags & MS_RDONLY) {
	265	if (!(sb->s_flags & MS_RDONLY))
	266	error = gfs2_make_fs_ro(sdp);
	267	} else if (!(*flags & MS_RDONLY) &&
	268	(sb->s_flags & MS_RDONLY)) {
	269	error = gfs2_make_fs_rw(sdp);
	270	}
	271	}
	272
	273	if (*flags & (MS_NOATIME \| MS_NODIRATIME))
	274	set_bit(SDF_NOATIME, &sdp->sd_flags);
	275	else
	276	clear_bit(SDF_NOATIME, &sdp->sd_flags);
	277
	278	/* Don't let the VFS update atimes. GFS2 handles this itself. */
	279	*flags \|= MS_NOATIME \| MS_NODIRATIME;
	280
	281	return error;
	282	}
	283
3b8249f6 SW	284	/**
	285	* gfs2_drop_inode - Drop an inode (test for remote unlink)
	286	* @inode: The inode to drop
	287	*
	288	* If we've received a callback on an iopen lock then its because a
	289	* remote node tried to deallocate the inode but failed due to this node
	290	* still having the inode open. Here we mark the link count zero
	291	* since we know that it must have reached zero if the GLF_DEMOTE flag
	292	* is set on the iopen glock. If we didn't do a disk read since the
	293	* remote node removed the final link then we might otherwise miss
	294	* this event. This check ensures that this node will deallocate the
	295	* inode's blocks, or alternatively pass the baton on to another
	296	* node for later deallocation.
	297	*/
	298	static void gfs2_drop_inode(struct inode *inode)
	299	{
091806ed BP	300	struct gfs2_inode *ip = GFS2_I(inode);
	301
	302	if (test_bit(GIF_USER, &ip->i_flags) && inode->i_nlink) {
3b8249f6 SW	303	struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
	304	if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
	305	clear_nlink(inode);
	306	}
	307	generic_drop_inode(inode);
	308	}
	309
b3b94faa DT	310	/**
	311	* gfs2_clear_inode - Deallocate an inode when VFS is done with it
	312	* @inode: The VFS inode
	313	*
	314	*/
	315
	316	static void gfs2_clear_inode(struct inode *inode)
	317	{
091806ed BP	318	struct gfs2_inode *ip = GFS2_I(inode);
091806ed BP	319
feaa7bba SW	320	/* This tells us its a "real" inode and not one which only
	321	* serves to contain an address space (see rgrp.c, meta_io.c)
	322	* which therefore doesn't have its own glocks.
	323	*/
091806ed	324	if (test_bit(GIF_USER, &ip->i_flags)) {
feaa7bba	325	ip->i_gl->gl_object = NULL;
b3b94faa	326	gfs2_glock_schedule_for_reclaim(ip->i_gl);
feaa7bba SW	327	gfs2_glock_put(ip->i_gl);
feaa7bba SW	328	ip->i_gl = NULL;
d93cfa98 AD	329	if (ip->i_iopen_gh.gh_gl) {
d93cfa98 AD	330	ip->i_iopen_gh.gh_gl->gl_object = NULL;
feaa7bba	331	gfs2_glock_dq_uninit(&ip->i_iopen_gh);
d93cfa98	332	}
b3b94faa DT	333	}
	334	}
	335
	336	/**
	337	* gfs2_show_options - Show mount options for /proc/mounts
	338	* @s: seq_file structure
	339	* @mnt: vfsmount
	340	*
	341	* Returns: 0 on success or error code
	342	*/
	343
	344	static int gfs2_show_options(struct seq_file s, struct vfsmount mnt)
	345	{
5c676f6d	346	struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
b3b94faa DT	347	struct gfs2_args *args = &sdp->sd_args;
b3b94faa DT	348
b3b94faa DT	349	if (args->ar_lockproto[0])
	350	seq_printf(s, ",lockproto=%s", args->ar_lockproto);
	351	if (args->ar_locktable[0])
	352	seq_printf(s, ",locktable=%s", args->ar_locktable);
	353	if (args->ar_hostdata[0])
	354	seq_printf(s, ",hostdata=%s", args->ar_hostdata);
	355	if (args->ar_spectator)
	356	seq_printf(s, ",spectator");
	357	if (args->ar_ignore_local_fs)
	358	seq_printf(s, ",ignore_local_fs");
	359	if (args->ar_localflocks)
	360	seq_printf(s, ",localflocks");
	361	if (args->ar_localcaching)
	362	seq_printf(s, ",localcaching");
	363	if (args->ar_debug)
	364	seq_printf(s, ",debug");
	365	if (args->ar_upgrade)
	366	seq_printf(s, ",upgrade");
	367	if (args->ar_num_glockd != GFS2_GLOCKD_DEFAULT)
	368	seq_printf(s, ",num_glockd=%u", args->ar_num_glockd);
	369	if (args->ar_posix_acl)
	370	seq_printf(s, ",acl");
	371	if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
	372	char *state;
	373	switch (args->ar_quota) {
	374	case GFS2_QUOTA_OFF:
	375	state = "off";
	376	break;
	377	case GFS2_QUOTA_ACCOUNT:
	378	state = "account";
	379	break;
	380	case GFS2_QUOTA_ON:
	381	state = "on";
	382	break;
	383	default:
	384	state = "unknown";
	385	break;
	386	}
	387	seq_printf(s, ",quota=%s", state);
	388	}
	389	if (args->ar_suiddir)
	390	seq_printf(s, ",suiddir");
	391	if (args->ar_data != GFS2_DATA_DEFAULT) {
	392	char *state;
	393	switch (args->ar_data) {
	394	case GFS2_DATA_WRITEBACK:
	395	state = "writeback";
	396	break;
	397	case GFS2_DATA_ORDERED:
	398	state = "ordered";
	399	break;
	400	default:
	401	state = "unknown";
	402	break;
	403	}
	404	seq_printf(s, ",data=%s", state);
	405	}
	406
	407	return 0;
	408	}
	409
907b9bce	410	/*
feaa7bba SW	411	* We have to (at the moment) hold the inodes main lock to cover
	412	* the gap between unlocking the shared lock on the iopen lock and
	413	* taking the exclusive lock. I'd rather do a shared -> exclusive
	414	* conversion on the iopen lock, but we can change that later. This
	415	* is safe, just less efficient.
	416	*/
	417	static void gfs2_delete_inode(struct inode *inode)
	418	{
	419	struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
	420	struct gfs2_inode *ip = GFS2_I(inode);
	421	struct gfs2_holder gh;
	422	int error;
	423
091806ed	424	if (!test_bit(GIF_USER, &ip->i_flags))
feaa7bba SW	425	goto out;
feaa7bba SW	426
d93cfa98	427	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
feaa7bba SW	428	if (unlikely(error)) {
	429	gfs2_glock_dq_uninit(&ip->i_iopen_gh);
	430	goto out;
	431	}
	432
d93cfa98	433	gfs2_glock_dq_wait(&ip->i_iopen_gh);
feaa7bba SW	434	gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB \| GL_NOCACHE, &ip->i_iopen_gh);
	435	error = gfs2_glock_nq(&ip->i_iopen_gh);
	436	if (error)
	437	goto out_uninit;
	438
b60623c2	439	if (S_ISDIR(inode->i_mode) &&
feaa7bba SW	440	(ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
	441	error = gfs2_dir_exhash_dealloc(ip);
	442	if (error)
	443	goto out_unlock;
	444	}
	445
	446	if (ip->i_di.di_eattr) {
	447	error = gfs2_ea_dealloc(ip);
	448	if (error)
	449	goto out_unlock;
	450	}
	451
	452	if (!gfs2_is_stuffed(ip)) {
	453	error = gfs2_file_dealloc(ip);
	454	if (error)
	455	goto out_unlock;
	456	}
	457
	458	error = gfs2_dinode_dealloc(ip);
16615be1 SW	459	if (error)
	460	goto out_unlock;
	461
	462	error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
	463	if (error)
	464	goto out_unlock;
	465	/* Needs to be done before glock release & also in a transaction */
49686f71	466	truncate_inode_pages(&inode->i_data, 0);
16615be1	467	gfs2_trans_end(sdp);
feaa7bba SW	468
	469	out_unlock:
	470	gfs2_glock_dq(&ip->i_iopen_gh);
	471	out_uninit:
	472	gfs2_holder_uninit(&ip->i_iopen_gh);
	473	gfs2_glock_dq_uninit(&gh);
3b8249f6	474	if (error && error != GLR_TRYFAILED)
feaa7bba SW	475	fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
	476	out:
	477	truncate_inode_pages(&inode->i_data, 0);
	478	clear_inode(inode);
	479	}
	480
	481
	482
320dd101 SW	483	static struct inode gfs2_alloc_inode(struct super_block sb)
320dd101 SW	484	{
320dd101 SW	485	struct gfs2_inode *ip;
	486
	487	ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
	488	if (ip) {
	489	ip->i_flags = 0;
	490	ip->i_gl = NULL;
320dd101 SW	491	}
	492	return &ip->i_inode;
	493	}
	494
	495	static void gfs2_destroy_inode(struct inode *inode)
	496	{
	497	kmem_cache_free(gfs2_inode_cachep, inode);
	498	}
	499
ee9b6d61	500	const struct super_operations gfs2_super_ops = {
4a221953 SW	501	.alloc_inode = gfs2_alloc_inode,
	502	.destroy_inode = gfs2_destroy_inode,
	503	.write_inode = gfs2_write_inode,
	504	.delete_inode = gfs2_delete_inode,
	505	.put_super = gfs2_put_super,
	506	.write_super = gfs2_write_super,
	507	.sync_fs = gfs2_sync_fs,
	508	.write_super_lockfs = gfs2_write_super_lockfs,
	509	.unlockfs = gfs2_unlockfs,
	510	.statfs = gfs2_statfs,
	511	.remount_fs = gfs2_remount_fs,
	512	.clear_inode = gfs2_clear_inode,
3b8249f6	513	.drop_inode = gfs2_drop_inode,
4a221953	514	.show_options = gfs2_show_options,
b3b94faa DT	515	};
b3b94faa DT	516