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

/*
 * 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]);

	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;
	if (wait)
		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)
{
	if (inode->i_private && inode->i_nlink) {
		struct gfs2_inode *ip = GFS2_I(inode);
		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)
{
	/* 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);
		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 (!inode->i_private)
		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);
	/*
	 * Must do this before unlock to avoid trying to write back
	 * potentially dirty data now that inode no longer exists
	 * on disk.
	 */
	truncate_inode_pages(&inode->i_data, 0);

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;
		ip->i_last_pfault = jiffies;
	}
	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.
3a8a9a10	3	* Copyright (C) 2004-2006 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"
	27	#include "inode.h"
	28	#include "lm.h"
	29	#include "log.h"
	30	#include "mount.h"
	31	#include "ops_super.h"
b3b94faa DT	32	#include "quota.h"
	33	#include "recovery.h"
	34	#include "rgrp.h"
	35	#include "super.h"
	36	#include "sys.h"
5c676f6d	37	#include "util.h"
feaa7bba SW	38	#include "trans.h"
	39	#include "dir.h"
	40	#include "eattr.h"
	41	#include "bmap.h"
b3b94faa DT	42
	43	/**
	44	* gfs2_write_inode - Make sure the inode is stable on the disk
	45	* @inode: The inode
	46	* @sync: synchronous write flag
	47	*
	48	* Returns: errno
	49	*/
	50
	51	static int gfs2_write_inode(struct inode *inode, int sync)
	52	{
feaa7bba SW	53	struct gfs2_inode *ip = GFS2_I(inode);
	54
	55	/* Check this is a "normal" inode */
bba9dfd8	56	if (inode->i_private) {
feaa7bba SW	57	if (current->flags & PF_MEMALLOC)
	58	return 0;
	59	if (sync)
3a8476dd	60	gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
feaa7bba	61	}
b3b94faa DT	62
	63	return 0;
	64	}
	65
	66	/**
	67	* gfs2_put_super - Unmount the filesystem
	68	* @sb: The VFS superblock
	69	*
	70	*/
	71
	72	static void gfs2_put_super(struct super_block *sb)
	73	{
5c676f6d	74	struct gfs2_sbd *sdp = sb->s_fs_info;
b3b94faa DT	75	int error;
	76
	77	if (!sdp)
	78	return;
	79
86384605	80	if (!strncmp(sb->s_type->name, "gfs2meta", 8))
5acd3967	81	return; /* Nothing to do */
86384605	82
b3b94faa DT	83	/* Unfreeze the filesystem, if we need to */
b3b94faa DT	84
f55ab26a	85	mutex_lock(&sdp->sd_freeze_lock);
b3b94faa DT	86	if (sdp->sd_freeze_count)
b3b94faa DT	87	gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
f55ab26a	88	mutex_unlock(&sdp->sd_freeze_lock);
b3b94faa	89
b3b94faa DT	90	kthread_stop(sdp->sd_quotad_process);
	91	kthread_stop(sdp->sd_logd_process);
	92	kthread_stop(sdp->sd_recoverd_process);
	93	while (sdp->sd_glockd_num--)
	94	kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
b3b94faa DT	95
	96	if (!(sb->s_flags & MS_RDONLY)) {
	97	error = gfs2_make_fs_ro(sdp);
	98	if (error)
	99	gfs2_io_error(sdp);
	100	}
b3b94faa DT	101	/* At this point, we're through modifying the disk */
	102
	103	/* Release stuff */
	104
f42faf4f SW	105	iput(sdp->sd_master_dir);
	106	iput(sdp->sd_jindex);
	107	iput(sdp->sd_inum_inode);
	108	iput(sdp->sd_statfs_inode);
	109	iput(sdp->sd_rindex);
	110	iput(sdp->sd_quota_inode);
b3b94faa DT	111
	112	gfs2_glock_put(sdp->sd_rename_gl);
	113	gfs2_glock_put(sdp->sd_trans_gl);
	114
	115	if (!sdp->sd_args.ar_spectator) {
	116	gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
	117	gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
	118	gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
	119	gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
b3b94faa	120	gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
f42faf4f SW	121	iput(sdp->sd_ir_inode);
f42faf4f SW	122	iput(sdp->sd_sc_inode);
f42faf4f	123	iput(sdp->sd_qc_inode);
b3b94faa DT	124	}
	125
	126	gfs2_glock_dq_uninit(&sdp->sd_live_gh);
b3b94faa DT	127	gfs2_clear_rgrpd(sdp);
b3b94faa DT	128	gfs2_jindex_free(sdp);
b3b94faa DT	129	/* Take apart glock structures and buffer lists */
b3b94faa DT	130	gfs2_gl_hash_clear(sdp, WAIT);
b3b94faa DT	131	/* Unmount the locking protocol */
	132	gfs2_lm_unmount(sdp);
	133
	134	/* At this point, we're through participating in the lockspace */
b3b94faa	135	gfs2_sys_fs_del(sdp);
ff6af411	136	kfree(sdp);
b3b94faa DT	137	}
	138
	139	/**
4a221953 SW	140	* gfs2_write_super
4a221953 SW	141	* @sb: the superblock
b3b94faa	142	*
b3b94faa DT	143	*/
	144
	145	static void gfs2_write_super(struct super_block *sb)
	146	{
4a221953 SW	147	sb->s_dirt = 0;
	148	}
	149
	150	/**
	151	* gfs2_sync_fs - sync the filesystem
	152	* @sb: the superblock
	153	*
	154	* Flushes the log to disk.
	155	*/
	156	static int gfs2_sync_fs(struct super_block *sb, int wait)
	157	{
	158	sb->s_dirt = 0;
b004157a SW	159	if (wait)
b004157a SW	160	gfs2_log_flush(sb->s_fs_info, NULL);
4a221953	161	return 0;
b3b94faa DT	162	}
	163
	164	/**
	165	* gfs2_write_super_lockfs - prevent further writes to the filesystem
	166	* @sb: the VFS structure for the filesystem
	167	*
	168	*/
	169
	170	static void gfs2_write_super_lockfs(struct super_block *sb)
	171	{
5c676f6d	172	struct gfs2_sbd *sdp = sb->s_fs_info;
b3b94faa DT	173	int error;
b3b94faa DT	174
c3780511 DT	175	if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
	176	return;
	177
b3b94faa DT	178	for (;;) {
	179	error = gfs2_freeze_fs(sdp);
	180	if (!error)
	181	break;
	182
	183	switch (error) {
	184	case -EBUSY:
	185	fs_err(sdp, "waiting for recovery before freeze\n");
	186	break;
	187
	188	default:
	189	fs_err(sdp, "error freezing FS: %d\n", error);
	190	break;
	191	}
	192
	193	fs_err(sdp, "retrying...\n");
	194	msleep(1000);
	195	}
	196	}
	197
	198	/**
	199	* gfs2_unlockfs - reallow writes to the filesystem
	200	* @sb: the VFS structure for the filesystem
	201	*
	202	*/
	203
	204	static void gfs2_unlockfs(struct super_block *sb)
	205	{
2bdbc5d7	206	gfs2_unfreeze_fs(sb->s_fs_info);
b3b94faa DT	207	}
	208
	209	/**
	210	* gfs2_statfs - Gather and return stats about the filesystem
	211	* @sb: The superblock
	212	* @statfsbuf: The buffer
	213	*
	214	* Returns: 0 on success or error code
	215	*/
	216
0c0834a3	217	static int gfs2_statfs(struct dentry dentry, struct kstatfs buf)
b3b94faa	218	{
0c0834a3	219	struct super_block *sb = dentry->d_inode->i_sb;
5c676f6d	220	struct gfs2_sbd *sdp = sb->s_fs_info;
bd209cc0	221	struct gfs2_statfs_change_host sc;
b3b94faa DT	222	int error;
b3b94faa DT	223
b3b94faa DT	224	if (gfs2_tune_get(sdp, gt_statfs_slow))
	225	error = gfs2_statfs_slow(sdp, &sc);
	226	else
	227	error = gfs2_statfs_i(sdp, &sc);
	228
	229	if (error)
	230	return error;
	231
b3b94faa DT	232	buf->f_type = GFS2_MAGIC;
	233	buf->f_bsize = sdp->sd_sb.sb_bsize;
	234	buf->f_blocks = sc.sc_total;
	235	buf->f_bfree = sc.sc_free;
	236	buf->f_bavail = sc.sc_free;
	237	buf->f_files = sc.sc_dinodes + sc.sc_free;
	238	buf->f_ffree = sc.sc_free;
	239	buf->f_namelen = GFS2_FNAMESIZE;
	240
	241	return 0;
	242	}
	243
	244	/**
	245	* gfs2_remount_fs - called when the FS is remounted
	246	* @sb: the filesystem
	247	* @flags: the remount flags
	248	* @data: extra data passed in (not used right now)
	249	*
	250	* Returns: errno
	251	*/
	252
	253	static int gfs2_remount_fs(struct super_block sb, int flags, char *data)
	254	{
5c676f6d	255	struct gfs2_sbd *sdp = sb->s_fs_info;
b3b94faa DT	256	int error;
b3b94faa DT	257
b3b94faa DT	258	error = gfs2_mount_args(sdp, data, 1);
	259	if (error)
	260	return error;
	261
	262	if (sdp->sd_args.ar_spectator)
	263	*flags \|= MS_RDONLY;
	264	else {
	265	if (*flags & MS_RDONLY) {
	266	if (!(sb->s_flags & MS_RDONLY))
	267	error = gfs2_make_fs_ro(sdp);
	268	} else if (!(*flags & MS_RDONLY) &&
	269	(sb->s_flags & MS_RDONLY)) {
	270	error = gfs2_make_fs_rw(sdp);
	271	}
	272	}
	273
	274	if (*flags & (MS_NOATIME \| MS_NODIRATIME))
	275	set_bit(SDF_NOATIME, &sdp->sd_flags);
	276	else
	277	clear_bit(SDF_NOATIME, &sdp->sd_flags);
	278
	279	/* Don't let the VFS update atimes. GFS2 handles this itself. */
	280	*flags \|= MS_NOATIME \| MS_NODIRATIME;
	281
	282	return error;
	283	}
	284
3b8249f6 SW	285	/**
	286	* gfs2_drop_inode - Drop an inode (test for remote unlink)
	287	* @inode: The inode to drop
	288	*
	289	* If we've received a callback on an iopen lock then its because a
	290	* remote node tried to deallocate the inode but failed due to this node
	291	* still having the inode open. Here we mark the link count zero
	292	* since we know that it must have reached zero if the GLF_DEMOTE flag
	293	* is set on the iopen glock. If we didn't do a disk read since the
	294	* remote node removed the final link then we might otherwise miss
	295	* this event. This check ensures that this node will deallocate the
	296	* inode's blocks, or alternatively pass the baton on to another
	297	* node for later deallocation.
	298	*/
	299	static void gfs2_drop_inode(struct inode *inode)
	300	{
	301	if (inode->i_private && inode->i_nlink) {
	302	struct gfs2_inode *ip = GFS2_I(inode);
	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	{
feaa7bba SW	318	/* This tells us its a "real" inode and not one which only
	319	* serves to contain an address space (see rgrp.c, meta_io.c)
	320	* which therefore doesn't have its own glocks.
	321	*/
bba9dfd8	322	if (inode->i_private) {
feaa7bba	323	struct gfs2_inode *ip = GFS2_I(inode);
feaa7bba	324	ip->i_gl->gl_object = NULL;
b3b94faa	325	gfs2_glock_schedule_for_reclaim(ip->i_gl);
feaa7bba SW	326	gfs2_glock_put(ip->i_gl);
feaa7bba SW	327	ip->i_gl = NULL;
d93cfa98 AD	328	if (ip->i_iopen_gh.gh_gl) {
d93cfa98 AD	329	ip->i_iopen_gh.gh_gl->gl_object = NULL;
feaa7bba	330	gfs2_glock_dq_uninit(&ip->i_iopen_gh);
d93cfa98	331	}
b3b94faa DT	332	}
	333	}
	334
	335	/**
	336	* gfs2_show_options - Show mount options for /proc/mounts
	337	* @s: seq_file structure
	338	* @mnt: vfsmount
	339	*
	340	* Returns: 0 on success or error code
	341	*/
	342
	343	static int gfs2_show_options(struct seq_file s, struct vfsmount mnt)
	344	{
5c676f6d	345	struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
b3b94faa DT	346	struct gfs2_args *args = &sdp->sd_args;
b3b94faa DT	347
b3b94faa DT	348	if (args->ar_lockproto[0])
	349	seq_printf(s, ",lockproto=%s", args->ar_lockproto);
	350	if (args->ar_locktable[0])
	351	seq_printf(s, ",locktable=%s", args->ar_locktable);
	352	if (args->ar_hostdata[0])
	353	seq_printf(s, ",hostdata=%s", args->ar_hostdata);
	354	if (args->ar_spectator)
	355	seq_printf(s, ",spectator");
	356	if (args->ar_ignore_local_fs)
	357	seq_printf(s, ",ignore_local_fs");
	358	if (args->ar_localflocks)
	359	seq_printf(s, ",localflocks");
	360	if (args->ar_localcaching)
	361	seq_printf(s, ",localcaching");
	362	if (args->ar_debug)
	363	seq_printf(s, ",debug");
	364	if (args->ar_upgrade)
	365	seq_printf(s, ",upgrade");
	366	if (args->ar_num_glockd != GFS2_GLOCKD_DEFAULT)
	367	seq_printf(s, ",num_glockd=%u", args->ar_num_glockd);
	368	if (args->ar_posix_acl)
	369	seq_printf(s, ",acl");
	370	if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
	371	char *state;
	372	switch (args->ar_quota) {
	373	case GFS2_QUOTA_OFF:
	374	state = "off";
	375	break;
	376	case GFS2_QUOTA_ACCOUNT:
	377	state = "account";
	378	break;
	379	case GFS2_QUOTA_ON:
	380	state = "on";
	381	break;
	382	default:
	383	state = "unknown";
	384	break;
	385	}
	386	seq_printf(s, ",quota=%s", state);
	387	}
	388	if (args->ar_suiddir)
	389	seq_printf(s, ",suiddir");
	390	if (args->ar_data != GFS2_DATA_DEFAULT) {
	391	char *state;
	392	switch (args->ar_data) {
	393	case GFS2_DATA_WRITEBACK:
	394	state = "writeback";
	395	break;
	396	case GFS2_DATA_ORDERED:
	397	state = "ordered";
	398	break;
	399	default:
	400	state = "unknown";
	401	break;
	402	}
	403	seq_printf(s, ",data=%s", state);
	404	}
	405
	406	return 0;
	407	}
	408
907b9bce	409	/*
feaa7bba SW	410	* We have to (at the moment) hold the inodes main lock to cover
	411	* the gap between unlocking the shared lock on the iopen lock and
	412	* taking the exclusive lock. I'd rather do a shared -> exclusive
	413	* conversion on the iopen lock, but we can change that later. This
	414	* is safe, just less efficient.
	415	*/
	416	static void gfs2_delete_inode(struct inode *inode)
	417	{
	418	struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
	419	struct gfs2_inode *ip = GFS2_I(inode);
	420	struct gfs2_holder gh;
	421	int error;
	422
bba9dfd8	423	if (!inode->i_private)
feaa7bba SW	424	goto out;
feaa7bba SW	425
d93cfa98	426	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
feaa7bba SW	427	if (unlikely(error)) {
	428	gfs2_glock_dq_uninit(&ip->i_iopen_gh);
	429	goto out;
	430	}
	431
d93cfa98	432	gfs2_glock_dq_wait(&ip->i_iopen_gh);
feaa7bba SW	433	gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB \| GL_NOCACHE, &ip->i_iopen_gh);
	434	error = gfs2_glock_nq(&ip->i_iopen_gh);
	435	if (error)
	436	goto out_uninit;
	437
b60623c2	438	if (S_ISDIR(inode->i_mode) &&
feaa7bba SW	439	(ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
	440	error = gfs2_dir_exhash_dealloc(ip);
	441	if (error)
	442	goto out_unlock;
	443	}
	444
	445	if (ip->i_di.di_eattr) {
	446	error = gfs2_ea_dealloc(ip);
	447	if (error)
	448	goto out_unlock;
	449	}
	450
	451	if (!gfs2_is_stuffed(ip)) {
	452	error = gfs2_file_dealloc(ip);
	453	if (error)
	454	goto out_unlock;
	455	}
	456
	457	error = gfs2_dinode_dealloc(ip);
49686f71 SW	458	/*
	459	* Must do this before unlock to avoid trying to write back
	460	* potentially dirty data now that inode no longer exists
	461	* on disk.
	462	*/
	463	truncate_inode_pages(&inode->i_data, 0);
feaa7bba SW	464
	465	out_unlock:
	466	gfs2_glock_dq(&ip->i_iopen_gh);
	467	out_uninit:
	468	gfs2_holder_uninit(&ip->i_iopen_gh);
	469	gfs2_glock_dq_uninit(&gh);
3b8249f6	470	if (error && error != GLR_TRYFAILED)
feaa7bba SW	471	fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
	472	out:
	473	truncate_inode_pages(&inode->i_data, 0);
	474	clear_inode(inode);
	475	}
	476
	477
	478
320dd101 SW	479	static struct inode gfs2_alloc_inode(struct super_block sb)
320dd101 SW	480	{
320dd101 SW	481	struct gfs2_inode *ip;
	482
	483	ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
	484	if (ip) {
	485	ip->i_flags = 0;
	486	ip->i_gl = NULL;
320dd101 SW	487	ip->i_last_pfault = jiffies;
	488	}
	489	return &ip->i_inode;
	490	}
	491
	492	static void gfs2_destroy_inode(struct inode *inode)
	493	{
	494	kmem_cache_free(gfs2_inode_cachep, inode);
	495	}
	496
ee9b6d61	497	const struct super_operations gfs2_super_ops = {
4a221953 SW	498	.alloc_inode = gfs2_alloc_inode,
	499	.destroy_inode = gfs2_destroy_inode,
	500	.write_inode = gfs2_write_inode,
	501	.delete_inode = gfs2_delete_inode,
	502	.put_super = gfs2_put_super,
	503	.write_super = gfs2_write_super,
	504	.sync_fs = gfs2_sync_fs,
	505	.write_super_lockfs = gfs2_write_super_lockfs,
	506	.unlockfs = gfs2_unlockfs,
	507	.statfs = gfs2_statfs,
	508	.remount_fs = gfs2_remount_fs,
	509	.clear_inode = gfs2_clear_inode,
3b8249f6	510	.drop_inode = gfs2_drop_inode,
4a221953	511	.show_options = gfs2_show_options,
b3b94faa DT	512	};
b3b94faa DT	513