[linux-block.git] / fs / coda / inode.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Super block/filesystem wide operations
 *
 * Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk> and 
 * Michael Callahan <callahan@maths.ox.ac.uk> 
 * 
 * Rewritten for Linux 2.1.  Peter Braam <braam@cs.cmu.edu>
 * Copyright (C) Carnegie Mellon University
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/file.h>
#include <linux/vfs.h>
#include <linux/slab.h>
#include <linux/pid_namespace.h>
#include <linux/uaccess.h>
#include <linux/fs.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include <linux/vmalloc.h>

#include <linux/coda.h>
#include "coda_psdev.h"
#include "coda_linux.h"
#include "coda_cache.h"

#include "coda_int.h"

/* VFS super_block ops */
static void coda_evict_inode(struct inode *);
static void coda_put_super(struct super_block *);
static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);

static struct kmem_cache * coda_inode_cachep;

static struct inode *coda_alloc_inode(struct super_block *sb)
{
	struct coda_inode_info *ei;
	ei = alloc_inode_sb(sb, coda_inode_cachep, GFP_KERNEL);
	if (!ei)
		return NULL;
	memset(&ei->c_fid, 0, sizeof(struct CodaFid));
	ei->c_flags = 0;
	ei->c_uid = GLOBAL_ROOT_UID;
	ei->c_cached_perm = 0;
	spin_lock_init(&ei->c_lock);
	return &ei->vfs_inode;
}

static void coda_free_inode(struct inode *inode)
{
	kmem_cache_free(coda_inode_cachep, ITOC(inode));
}

static void init_once(void *foo)
{
	struct coda_inode_info *ei = (struct coda_inode_info *) foo;

	inode_init_once(&ei->vfs_inode);
}

int __init coda_init_inodecache(void)
{
	coda_inode_cachep = kmem_cache_create("coda_inode_cache",
				sizeof(struct coda_inode_info), 0,
				SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT,
				init_once);
	if (coda_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

void coda_destroy_inodecache(void)
{
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
	kmem_cache_destroy(coda_inode_cachep);
}

static int coda_reconfigure(struct fs_context *fc)
{
	sync_filesystem(fc->root->d_sb);
	fc->sb_flags |= SB_NOATIME;
	return 0;
}

/* exported operations */
static const struct super_operations coda_super_operations =
{
	.alloc_inode	= coda_alloc_inode,
	.free_inode	= coda_free_inode,
	.evict_inode	= coda_evict_inode,
	.put_super	= coda_put_super,
	.statfs		= coda_statfs,
};

struct coda_fs_context {
	int	idx;
};

enum {
	Opt_fd,
};

static const struct fs_parameter_spec coda_param_specs[] = {
	fsparam_fd	("fd",	Opt_fd),
	{}
};

static int coda_parse_fd(struct fs_context *fc, int fd)
{
	struct coda_fs_context *ctx = fc->fs_private;
	struct fd f;
	struct inode *inode;
	int idx;

	f = fdget(fd);
	if (!f.file)
		return -EBADF;
	inode = file_inode(f.file);
	if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) {
		fdput(f);
		return invalf(fc, "code: Not coda psdev");
	}

	idx = iminor(inode);
	fdput(f);

	if (idx < 0 || idx >= MAX_CODADEVS)
		return invalf(fc, "coda: Bad minor number");
	ctx->idx = idx;
	return 0;
}

static int coda_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
	struct fs_parse_result result;
	int opt;

	opt = fs_parse(fc, coda_param_specs, param, &result);
	if (opt < 0)
		return opt;

	switch (opt) {
	case Opt_fd:
		return coda_parse_fd(fc, result.uint_32);
	}

	return 0;
}

/*
 * Parse coda's binary mount data form.  We ignore any errors and go with index
 * 0 if we get one for backward compatibility.
 */
static int coda_parse_monolithic(struct fs_context *fc, void *_data)
{
	struct coda_mount_data *data = _data;

	if (!data)
		return invalf(fc, "coda: Bad mount data");

	if (data->version != CODA_MOUNT_VERSION)
		return invalf(fc, "coda: Bad mount version");

	coda_parse_fd(fc, data->fd);
	return 0;
}

static int coda_fill_super(struct super_block *sb, struct fs_context *fc)
{
	struct coda_fs_context *ctx = fc->fs_private;
	struct inode *root = NULL;
	struct venus_comm *vc;
	struct CodaFid fid;
	int error;

	infof(fc, "coda: device index: %i\n", ctx->idx);

	vc = &coda_comms[ctx->idx];
	mutex_lock(&vc->vc_mutex);

	if (!vc->vc_inuse) {
		errorf(fc, "coda: No pseudo device");
		error = -EINVAL;
		goto unlock_out;
	}

	if (vc->vc_sb) {
		errorf(fc, "coda: Device already mounted");
		error = -EBUSY;
		goto unlock_out;
	}

	vc->vc_sb = sb;
	mutex_unlock(&vc->vc_mutex);

	sb->s_fs_info = vc;
	sb->s_flags |= SB_NOATIME;
	sb->s_blocksize = 4096;	/* XXXXX  what do we put here?? */
	sb->s_blocksize_bits = 12;
	sb->s_magic = CODA_SUPER_MAGIC;
	sb->s_op = &coda_super_operations;
	sb->s_d_op = &coda_dentry_operations;
	sb->s_time_gran = 1;
	sb->s_time_min = S64_MIN;
	sb->s_time_max = S64_MAX;

	error = super_setup_bdi(sb);
	if (error)
		goto error;

	/* get root fid from Venus: this needs the root inode */
	error = venus_rootfid(sb, &fid);
	if ( error ) {
		pr_warn("%s: coda_get_rootfid failed with %d\n",
			__func__, error);
		goto error;
	}
	pr_info("%s: rootfid is %s\n", __func__, coda_f2s(&fid));
	
	/* make root inode */
        root = coda_cnode_make(&fid, sb);
        if (IS_ERR(root)) {
		error = PTR_ERR(root);
		pr_warn("Failure of coda_cnode_make for root: error %d\n",
			error);
		goto error;
	} 

	pr_info("%s: rootinode is %ld dev %s\n",
		__func__, root->i_ino, root->i_sb->s_id);
	sb->s_root = d_make_root(root);
	if (!sb->s_root) {
		error = -EINVAL;
		goto error;
	}
	return 0;

error:
	mutex_lock(&vc->vc_mutex);
	vc->vc_sb = NULL;
	sb->s_fs_info = NULL;
unlock_out:
	mutex_unlock(&vc->vc_mutex);
	return error;
}

static void coda_put_super(struct super_block *sb)
{
	struct venus_comm *vcp = coda_vcp(sb);
	mutex_lock(&vcp->vc_mutex);
	vcp->vc_sb = NULL;
	sb->s_fs_info = NULL;
	mutex_unlock(&vcp->vc_mutex);
	mutex_destroy(&vcp->vc_mutex);

	pr_info("Bye bye.\n");
}

static void coda_evict_inode(struct inode *inode)
{
	truncate_inode_pages_final(&inode->i_data);
	clear_inode(inode);
	coda_cache_clear_inode(inode);
}

int coda_getattr(struct mnt_idmap *idmap, const struct path *path,
		 struct kstat *stat, u32 request_mask, unsigned int flags)
{
	int err = coda_revalidate_inode(d_inode(path->dentry));
	if (!err)
		generic_fillattr(&nop_mnt_idmap, request_mask,
				 d_inode(path->dentry), stat);
	return err;
}

int coda_setattr(struct mnt_idmap *idmap, struct dentry *de,
		 struct iattr *iattr)
{
	struct inode *inode = d_inode(de);
	struct coda_vattr vattr;
	int error;

	memset(&vattr, 0, sizeof(vattr)); 

	inode_set_ctime_current(inode);
	coda_iattr_to_vattr(iattr, &vattr);
	vattr.va_type = C_VNON; /* cannot set type */

	/* Venus is responsible for truncating the container-file!!! */
	error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);

	if (!error) {
	        coda_vattr_to_iattr(inode, &vattr); 
		coda_cache_clear_inode(inode);
	}
	return error;
}

const struct inode_operations coda_file_inode_operations = {
	.permission	= coda_permission,
	.getattr	= coda_getattr,
	.setattr	= coda_setattr,
};

static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	int error;
	
	error = venus_statfs(dentry, buf);

	if (error) {
		/* fake something like AFS does */
		buf->f_blocks = 9000000;
		buf->f_bfree  = 9000000;
		buf->f_bavail = 9000000;
		buf->f_files  = 9000000;
		buf->f_ffree  = 9000000;
	}

	/* and fill in the rest */
	buf->f_type = CODA_SUPER_MAGIC;
	buf->f_bsize = 4096;
	buf->f_namelen = CODA_MAXNAMLEN;

	return 0; 
}

static int coda_get_tree(struct fs_context *fc)
{
	if (task_active_pid_ns(current) != &init_pid_ns)
		return -EINVAL;

	return get_tree_nodev(fc, coda_fill_super);
}

static void coda_free_fc(struct fs_context *fc)
{
	kfree(fc->fs_private);
}

static const struct fs_context_operations coda_context_ops = {
	.free		= coda_free_fc,
	.parse_param	= coda_parse_param,
	.parse_monolithic = coda_parse_monolithic,
	.get_tree	= coda_get_tree,
	.reconfigure	= coda_reconfigure,
};

static int coda_init_fs_context(struct fs_context *fc)
{
	struct coda_fs_context *ctx;

	ctx = kzalloc(sizeof(struct coda_fs_context), GFP_KERNEL);
	if (!ctx)
		return -ENOMEM;

	fc->fs_private = ctx;
	fc->ops = &coda_context_ops;
	return 0;
}

struct file_system_type coda_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "coda",
	.init_fs_context = coda_init_fs_context,
	.parameters	= coda_param_specs,
	.kill_sb	= kill_anon_super,
	.fs_flags	= FS_BINARY_MOUNTDATA,
};
MODULE_ALIAS_FS("coda");
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* Super block/filesystem wide operations
	4	*
	5	* Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk> and
	6	* Michael Callahan <callahan@maths.ox.ac.uk>
	7	*
	8	* Rewritten for Linux 2.1. Peter Braam <braam@cs.cmu.edu>
	9	* Copyright (C) Carnegie Mellon University
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/kernel.h>
	14	#include <linux/mm.h>
	15	#include <linux/string.h>
	16	#include <linux/stat.h>
	17	#include <linux/errno.h>
	18	#include <linux/unistd.h>
da47c19e	19	#include <linux/mutex.h>
b5ce1d83	20	#include <linux/spinlock.h>
1da177e4 LT	21	#include <linux/file.h>
1da177e4 LT	22	#include <linux/vfs.h>
5a0e3ad6	23	#include <linux/slab.h>
9fd973e0	24	#include <linux/pid_namespace.h>
834b46c3	25	#include <linux/uaccess.h>
1da177e4	26	#include <linux/fs.h>
5916f439 DH	27	#include <linux/fs_context.h>
5916f439 DH	28	#include <linux/fs_parser.h>
1da177e4 LT	29	#include <linux/vmalloc.h>
	30
	31	#include <linux/coda.h>
8fc8b9df	32	#include "coda_psdev.h"
31a203df AV	33	#include "coda_linux.h"
31a203df AV	34	#include "coda_cache.h"
1da177e4	35
c98d8cfb AB	36	#include "coda_int.h"
c98d8cfb AB	37
1da177e4	38	/* VFS super_block ops */
b57922d9	39	static void coda_evict_inode(struct inode *);
1da177e4	40	static void coda_put_super(struct super_block *);
726c3342	41	static int coda_statfs(struct dentry dentry, struct kstatfs buf);
1da177e4	42
e18b890b	43	static struct kmem_cache * coda_inode_cachep;
1da177e4 LT	44
	45	static struct inode coda_alloc_inode(struct super_block sb)
	46	{
	47	struct coda_inode_info *ei;
fd60b288	48	ei = alloc_inode_sb(sb, coda_inode_cachep, GFP_KERNEL);
1da177e4 LT	49	if (!ei)
	50	return NULL;
	51	memset(&ei->c_fid, 0, sizeof(struct CodaFid));
	52	ei->c_flags = 0;
17499e33	53	ei->c_uid = GLOBAL_ROOT_UID;
1da177e4	54	ei->c_cached_perm = 0;
b5ce1d83	55	spin_lock_init(&ei->c_lock);
1da177e4 LT	56	return &ei->vfs_inode;
	57	}
	58
d984892b	59	static void coda_free_inode(struct inode *inode)
1da177e4 LT	60	{
	61	kmem_cache_free(coda_inode_cachep, ITOC(inode));
	62	}
	63
51cc5068	64	static void init_once(void *foo)
1da177e4 LT	65	{
	66	struct coda_inode_info ei = (struct coda_inode_info ) foo;
	67
a35afb83	68	inode_init_once(&ei->vfs_inode);
1da177e4	69	}
20c2df83	70
5f356fd4	71	int __init coda_init_inodecache(void)
1da177e4 LT	72	{
1da177e4 LT	73	coda_inode_cachep = kmem_cache_create("coda_inode_cache",
5d097056	74	sizeof(struct coda_inode_info), 0,
f88c3fb8 LT	75	SLAB_RECLAIM_ACCOUNT \| SLAB_ACCOUNT,
f88c3fb8 LT	76	init_once);
1da177e4 LT	77	if (coda_inode_cachep == NULL)
	78	return -ENOMEM;
	79	return 0;
	80	}
	81
	82	void coda_destroy_inodecache(void)
	83	{
8c0a8537 KS	84	/*
	85	* Make sure all delayed rcu free inodes are flushed before we
	86	* destroy cache.
	87	*/
	88	rcu_barrier();
1a1d92c1	89	kmem_cache_destroy(coda_inode_cachep);
1da177e4 LT	90	}
1da177e4 LT	91
5916f439	92	static int coda_reconfigure(struct fs_context *fc)
1da177e4	93	{
5916f439 DH	94	sync_filesystem(fc->root->d_sb);
5916f439 DH	95	fc->sb_flags \|= SB_NOATIME;
1da177e4 LT	96	return 0;
	97	}
	98
	99	/* exported operations */
ee9b6d61	100	static const struct super_operations coda_super_operations =
1da177e4 LT	101	{
1da177e4 LT	102	.alloc_inode = coda_alloc_inode,
d984892b	103	.free_inode = coda_free_inode,
b57922d9	104	.evict_inode = coda_evict_inode,
1da177e4 LT	105	.put_super = coda_put_super,
1da177e4 LT	106	.statfs = coda_statfs,
1da177e4 LT	107	};
1da177e4 LT	108
5916f439 DH	109	struct coda_fs_context {
	110	int idx;
	111	};
	112
	113	enum {
	114	Opt_fd,
	115	};
	116
	117	static const struct fs_parameter_spec coda_param_specs[] = {
	118	fsparam_fd ("fd", Opt_fd),
	119	{}
	120	};
	121
	122	static int coda_parse_fd(struct fs_context *fc, int fd)
1da177e4	123	{
5916f439	124	struct coda_fs_context *ctx = fc->fs_private;
2903ff01	125	struct fd f;
1da177e4	126	struct inode *inode;
2903ff01	127	int idx;
1da177e4	128
5916f439	129	f = fdget(fd);
2903ff01	130	if (!f.file)
5916f439	131	return -EBADF;
496ad9aa	132	inode = file_inode(f.file);
78f7d75e	133	if (!S_ISCHR(inode->i_mode) \|\| imajor(inode) != CODA_PSDEV_MAJOR) {
2903ff01	134	fdput(f);
5916f439	135	return invalf(fc, "code: Not coda psdev");
1da177e4 LT	136	}
	137
	138	idx = iminor(inode);
2903ff01	139	fdput(f);
1da177e4	140
5916f439 DH	141	if (idx < 0 \|\| idx >= MAX_CODADEVS)
	142	return invalf(fc, "coda: Bad minor number");
	143	ctx->idx = idx;
	144	return 0;
	145	}
	146
	147	static int coda_parse_param(struct fs_context fc, struct fs_parameter param)
	148	{
	149	struct fs_parse_result result;
	150	int opt;
	151
	152	opt = fs_parse(fc, coda_param_specs, param, &result);
	153	if (opt < 0)
	154	return opt;
	155
	156	switch (opt) {
	157	case Opt_fd:
	158	return coda_parse_fd(fc, result.uint_32);
1da177e4 LT	159	}
1da177e4 LT	160
5916f439 DH	161	return 0;
	162	}
	163
	164	/*
	165	* Parse coda's binary mount data form. We ignore any errors and go with index
	166	* 0 if we get one for backward compatibility.
	167	*/
	168	static int coda_parse_monolithic(struct fs_context fc, void _data)
	169	{
	170	struct coda_mount_data *data = _data;
	171
	172	if (!data)
	173	return invalf(fc, "coda: Bad mount data");
	174
	175	if (data->version != CODA_MOUNT_VERSION)
	176	return invalf(fc, "coda: Bad mount version");
	177
	178	coda_parse_fd(fc, data->fd);
	179	return 0;
1da177e4 LT	180	}
1da177e4 LT	181
5916f439	182	static int coda_fill_super(struct super_block sb, struct fs_context fc)
1da177e4	183	{
5916f439	184	struct coda_fs_context *ctx = fc->fs_private;
a1b0aa87	185	struct inode *root = NULL;
da47c19e	186	struct venus_comm *vc;
1da177e4	187	struct CodaFid fid;
a1b0aa87	188	int error;
1da177e4	189
5916f439	190	infof(fc, "coda: device index: %i\n", ctx->idx);
1da177e4	191
5916f439	192	vc = &coda_comms[ctx->idx];
da47c19e	193	mutex_lock(&vc->vc_mutex);
f7cc02b8	194
1da177e4	195	if (!vc->vc_inuse) {
5916f439	196	errorf(fc, "coda: No pseudo device");
f7cc02b8 YA	197	error = -EINVAL;
f7cc02b8 YA	198	goto unlock_out;
1da177e4 LT	199	}
1da177e4 LT	200
f7cc02b8	201	if (vc->vc_sb) {
5916f439	202	errorf(fc, "coda: Device already mounted");
f7cc02b8 YA	203	error = -EBUSY;
f7cc02b8 YA	204	goto unlock_out;
1da177e4 LT	205	}
1da177e4 LT	206
1da177e4	207	vc->vc_sb = sb;
da47c19e	208	mutex_unlock(&vc->vc_mutex);
1da177e4	209
a1b0aa87	210	sb->s_fs_info = vc;
1751e8a6	211	sb->s_flags \|= SB_NOATIME;
fac1f0e3 JH	212	sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
	213	sb->s_blocksize_bits = 12;
	214	sb->s_magic = CODA_SUPER_MAGIC;
	215	sb->s_op = &coda_super_operations;
9501e4c4	216	sb->s_d_op = &coda_dentry_operations;
22b13969 DD	217	sb->s_time_gran = 1;
	218	sb->s_time_min = S64_MIN;
	219	sb->s_time_max = S64_MAX;
a5695a79 JK	220
	221	error = super_setup_bdi(sb);
	222	if (error)
	223	goto error;
1da177e4 LT	224
	225	/* get root fid from Venus: this needs the root inode */
	226	error = venus_rootfid(sb, &fid);
	227	if ( error ) {
6d6bd94f FF	228	pr_warn("%s: coda_get_rootfid failed with %d\n",
6d6bd94f FF	229	__func__, error);
1da177e4 LT	230	goto error;
1da177e4 LT	231	}
6d6bd94f	232	pr_info("%s: rootfid is %s\n", __func__, coda_f2s(&fid));
1da177e4 LT	233
1da177e4 LT	234	/* make root inode */
f4947fbc AV	235	root = coda_cnode_make(&fid, sb);
	236	if (IS_ERR(root)) {
	237	error = PTR_ERR(root);
d9b4b319 FF	238	pr_warn("Failure of coda_cnode_make for root: error %d\n",
d9b4b319 FF	239	error);
f4947fbc	240	goto error;
1da177e4 LT	241	}
1da177e4 LT	242
6d6bd94f FF	243	pr_info("%s: rootinode is %ld dev %s\n",
6d6bd94f FF	244	__func__, root->i_ino, root->i_sb->s_id);
48fde701	245	sb->s_root = d_make_root(root);
f7cc02b8 YA	246	if (!sb->s_root) {
f7cc02b8 YA	247	error = -EINVAL;
1da177e4	248	goto error;
f7cc02b8	249	}
db719222	250	return 0;
1da177e4	251
f7cc02b8	252	error:
da47c19e	253	mutex_lock(&vc->vc_mutex);
f7cc02b8 YA	254	vc->vc_sb = NULL;
	255	sb->s_fs_info = NULL;
	256	unlock_out:
da47c19e	257	mutex_unlock(&vc->vc_mutex);
f7cc02b8	258	return error;
1da177e4 LT	259	}
	260
	261	static void coda_put_super(struct super_block *sb)
	262	{
da47c19e YA	263	struct venus_comm *vcp = coda_vcp(sb);
da47c19e YA	264	mutex_lock(&vcp->vc_mutex);
da47c19e	265	vcp->vc_sb = NULL;
a1b0aa87	266	sb->s_fs_info = NULL;
da47c19e	267	mutex_unlock(&vcp->vc_mutex);
79a0d65e	268	mutex_destroy(&vcp->vc_mutex);
1da177e4	269
f38cfb25	270	pr_info("Bye bye.\n");
1da177e4 LT	271	}
1da177e4 LT	272
b57922d9	273	static void coda_evict_inode(struct inode *inode)
1da177e4	274	{
91b0abe3	275	truncate_inode_pages_final(&inode->i_data);
dbd5768f	276	clear_inode(inode);
1da177e4 LT	277	coda_cache_clear_inode(inode);
	278	}
	279
b74d24f7	280	int coda_getattr(struct mnt_idmap idmap, const struct path path,
549c7297	281	struct kstat *stat, u32 request_mask, unsigned int flags)
1da177e4	282	{
a528d35e	283	int err = coda_revalidate_inode(d_inode(path->dentry));
1da177e4	284	if (!err)
0d72b928 JL	285	generic_fillattr(&nop_mnt_idmap, request_mask,
0d72b928 JL	286	d_inode(path->dentry), stat);
1da177e4 LT	287	return err;
	288	}
	289
c1632a0f	290	int coda_setattr(struct mnt_idmap idmap, struct dentry de,
549c7297	291	struct iattr *iattr)
1da177e4	292	{
2b0143b5	293	struct inode *inode = d_inode(de);
1da177e4 LT	294	struct coda_vattr vattr;
	295	int error;
	296
1da177e4 LT	297	memset(&vattr, 0, sizeof(vattr));
1da177e4 LT	298
ea9b53d4	299	inode_set_ctime_current(inode);
1da177e4 LT	300	coda_iattr_to_vattr(iattr, &vattr);
	301	vattr.va_type = C_VNON; /* cannot set type */
	302
	303	/* Venus is responsible for truncating the container-file!!! */
	304	error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
	305
f7cc02b8	306	if (!error) {
1da177e4 LT	307	coda_vattr_to_iattr(inode, &vattr);
	308	coda_cache_clear_inode(inode);
	309	}
1da177e4 LT	310	return error;
	311	}
	312
754661f1	313	const struct inode_operations coda_file_inode_operations = {
1da177e4 LT	314	.permission = coda_permission,
	315	.getattr = coda_getattr,
	316	.setattr = coda_setattr,
	317	};
	318
726c3342	319	static int coda_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4 LT	320	{
	321	int error;
	322
726c3342	323	error = venus_statfs(dentry, buf);
1da177e4	324
1da177e4 LT	325	if (error) {
	326	/* fake something like AFS does */
	327	buf->f_blocks = 9000000;
	328	buf->f_bfree = 9000000;
	329	buf->f_bavail = 9000000;
	330	buf->f_files = 9000000;
	331	buf->f_ffree = 9000000;
	332	}
	333
	334	/* and fill in the rest */
	335	buf->f_type = CODA_SUPER_MAGIC;
fac1f0e3	336	buf->f_bsize = 4096;
1da177e4 LT	337	buf->f_namelen = CODA_MAXNAMLEN;
	338
	339	return 0;
	340	}
	341
5916f439 DH	342	static int coda_get_tree(struct fs_context *fc)
	343	{
	344	if (task_active_pid_ns(current) != &init_pid_ns)
	345	return -EINVAL;
1da177e4	346
5916f439 DH	347	return get_tree_nodev(fc, coda_fill_super);
	348	}
	349
	350	static void coda_free_fc(struct fs_context *fc)
1da177e4	351	{
5916f439 DH	352	kfree(fc->fs_private);
	353	}
	354
	355	static const struct fs_context_operations coda_context_ops = {
	356	.free = coda_free_fc,
	357	.parse_param = coda_parse_param,
	358	.parse_monolithic = coda_parse_monolithic,
	359	.get_tree = coda_get_tree,
	360	.reconfigure = coda_reconfigure,
	361	};
	362
	363	static int coda_init_fs_context(struct fs_context *fc)
	364	{
	365	struct coda_fs_context *ctx;
	366
	367	ctx = kzalloc(sizeof(struct coda_fs_context), GFP_KERNEL);
	368	if (!ctx)
	369	return -ENOMEM;
	370
	371	fc->fs_private = ctx;
	372	fc->ops = &coda_context_ops;
	373	return 0;
1da177e4 LT	374	}
	375
	376	struct file_system_type coda_fs_type = {
	377	.owner = THIS_MODULE,
	378	.name = "coda",
5916f439 DH	379	.init_fs_context = coda_init_fs_context,
5916f439 DH	380	.parameters = coda_param_specs,
1da177e4 LT	381	.kill_sb = kill_anon_super,
	382	.fs_flags = FS_BINARY_MOUNTDATA,
	383	};
7f78e035	384	MODULE_ALIAS_FS("coda");
1da177e4	385