[linux.git] / fs / afs / super.c

/* AFS superblock handling
 *
 * Copyright (c) 2002, 2007 Red Hat, Inc. All rights reserved.
 *
 * This software may be freely redistributed under the terms of the
 * GNU General Public License.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Authors: David Howells <[email protected]>
 *          David Woodhouse <[email protected]>
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/parser.h>
#include <linux/statfs.h>
#include <linux/sched.h>
#include "internal.h"

#define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */

static void afs_i_init_once(void *foo, struct kmem_cache *cachep,
			    unsigned long flags);
static int afs_get_sb(struct file_system_type *fs_type,
		      int flags, const char *dev_name,
		      void *data, struct vfsmount *mnt);
static struct inode *afs_alloc_inode(struct super_block *sb);
static void afs_put_super(struct super_block *sb);
static void afs_destroy_inode(struct inode *inode);
static int afs_statfs(struct dentry *dentry, struct kstatfs *buf);

struct file_system_type afs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "afs",
	.get_sb		= afs_get_sb,
	.kill_sb	= kill_anon_super,
	.fs_flags	= 0,
};

static const struct super_operations afs_super_ops = {
	.statfs		= afs_statfs,
	.alloc_inode	= afs_alloc_inode,
	.write_inode	= afs_write_inode,
	.destroy_inode	= afs_destroy_inode,
	.clear_inode	= afs_clear_inode,
	.umount_begin	= afs_umount_begin,
	.put_super	= afs_put_super,
};

static struct kmem_cache *afs_inode_cachep;
static atomic_t afs_count_active_inodes;

enum {
	afs_no_opt,
	afs_opt_cell,
	afs_opt_rwpath,
	afs_opt_vol,
};

static match_table_t afs_options_list = {
	{ afs_opt_cell,		"cell=%s"	},
	{ afs_opt_rwpath,	"rwpath"	},
	{ afs_opt_vol,		"vol=%s"	},
	{ afs_no_opt,		NULL		},
};

/*
 * initialise the filesystem
 */
int __init afs_fs_init(void)
{
	int ret;

	_enter("");

	/* create ourselves an inode cache */
	atomic_set(&afs_count_active_inodes, 0);

	ret = -ENOMEM;
	afs_inode_cachep = kmem_cache_create("afs_inode_cache",
					     sizeof(struct afs_vnode),
					     0,
					     SLAB_HWCACHE_ALIGN,
					     afs_i_init_once,
					     NULL);
	if (!afs_inode_cachep) {
		printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n");
		return ret;
	}

	/* now export our filesystem to lesser mortals */
	ret = register_filesystem(&afs_fs_type);
	if (ret < 0) {
		kmem_cache_destroy(afs_inode_cachep);
		_leave(" = %d", ret);
		return ret;
	}

	_leave(" = 0");
	return 0;
}

/*
 * clean up the filesystem
 */
void __exit afs_fs_exit(void)
{
	_enter("");

	afs_mntpt_kill_timer();
	unregister_filesystem(&afs_fs_type);

	if (atomic_read(&afs_count_active_inodes) != 0) {
		printk("kAFS: %d active inode objects still present\n",
		       atomic_read(&afs_count_active_inodes));
		BUG();
	}

	kmem_cache_destroy(afs_inode_cachep);
	_leave("");
}

/*
 * parse the mount options
 * - this function has been shamelessly adapted from the ext3 fs which
 *   shamelessly adapted it from the msdos fs
 */
static int afs_parse_options(struct afs_mount_params *params,
			     char *options, const char **devname)
{
	struct afs_cell *cell;
	substring_t args[MAX_OPT_ARGS];
	char *p;
	int token;

	_enter("%s", options);

	options[PAGE_SIZE - 1] = 0;

	while ((p = strsep(&options, ","))) {
		if (!*p)
			continue;

		token = match_token(p, afs_options_list, args);
		switch (token) {
		case afs_opt_cell:
			cell = afs_cell_lookup(args[0].from,
					       args[0].to - args[0].from);
			if (IS_ERR(cell))
				return PTR_ERR(cell);
			afs_put_cell(params->cell);
			params->cell = cell;
			break;

		case afs_opt_rwpath:
			params->rwpath = 1;
			break;

		case afs_opt_vol:
			*devname = args[0].from;
			break;

		default:
			printk(KERN_ERR "kAFS:"
			       " Unknown or invalid mount option: '%s'\n", p);
			return -EINVAL;
		}
	}

	_leave(" = 0");
	return 0;
}

/*
 * parse a device name to get cell name, volume name, volume type and R/W
 * selector
 * - this can be one of the following:
 *	"%[cell:]volume[.]"		R/W volume
 *	"#[cell:]volume[.]"		R/O or R/W volume (rwpath=0),
 *					 or R/W (rwpath=1) volume
 *	"%[cell:]volume.readonly"	R/O volume
 *	"#[cell:]volume.readonly"	R/O volume
 *	"%[cell:]volume.backup"		Backup volume
 *	"#[cell:]volume.backup"		Backup volume
 */
static int afs_parse_device_name(struct afs_mount_params *params,
				 const char *name)
{
	struct afs_cell *cell;
	const char *cellname, *suffix;
	int cellnamesz;

	_enter(",%s", name);

	if (!name) {
		printk(KERN_ERR "kAFS: no volume name specified\n");
		return -EINVAL;
	}

	if ((name[0] != '%' && name[0] != '#') || !name[1]) {
		printk(KERN_ERR "kAFS: unparsable volume name\n");
		return -EINVAL;
	}

	/* determine the type of volume we're looking for */
	params->type = AFSVL_ROVOL;
	params->force = false;
	if (params->rwpath || name[0] == '%') {
		params->type = AFSVL_RWVOL;
		params->force = true;
	}
	name++;

	/* split the cell name out if there is one */
	params->volname = strchr(name, ':');
	if (params->volname) {
		cellname = name;
		cellnamesz = params->volname - name;
		params->volname++;
	} else {
		params->volname = name;
		cellname = NULL;
		cellnamesz = 0;
	}

	/* the volume type is further affected by a possible suffix */
	suffix = strrchr(params->volname, '.');
	if (suffix) {
		if (strcmp(suffix, ".readonly") == 0) {
			params->type = AFSVL_ROVOL;
			params->force = true;
		} else if (strcmp(suffix, ".backup") == 0) {
			params->type = AFSVL_BACKVOL;
			params->force = true;
		} else if (suffix[1] == 0) {
		} else {
			suffix = NULL;
		}
	}

	params->volnamesz = suffix ?
		suffix - params->volname : strlen(params->volname);

	_debug("cell %*.*s [%p]",
	       cellnamesz, cellnamesz, cellname ?: "", params->cell);

	/* lookup the cell record */
	if (cellname || !params->cell) {
		cell = afs_cell_lookup(cellname, cellnamesz);
		if (IS_ERR(cell)) {
			printk(KERN_ERR "kAFS: unable to lookup cell '%s'\n",
			       cellname ?: "");
			return PTR_ERR(cell);
		}
		afs_put_cell(params->cell);
		params->cell = cell;
	}

	_debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s",
	       params->cell->name, params->cell,
	       params->volnamesz, params->volnamesz, params->volname,
	       suffix ?: "-", params->type, params->force ? " FORCE" : "");

	return 0;
}

/*
 * check a superblock to see if it's the one we're looking for
 */
static int afs_test_super(struct super_block *sb, void *data)
{
	struct afs_mount_params *params = data;
	struct afs_super_info *as = sb->s_fs_info;

	return as->volume == params->volume;
}

/*
 * fill in the superblock
 */
static int afs_fill_super(struct super_block *sb, void *data)
{
	struct afs_mount_params *params = data;
	struct afs_super_info *as = NULL;
	struct afs_fid fid;
	struct dentry *root = NULL;
	struct inode *inode = NULL;
	int ret;

	_enter("");

	/* allocate a superblock info record */
	as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
	if (!as) {
		_leave(" = -ENOMEM");
		return -ENOMEM;
	}

	afs_get_volume(params->volume);
	as->volume = params->volume;

	/* fill in the superblock */
	sb->s_blocksize		= PAGE_CACHE_SIZE;
	sb->s_blocksize_bits	= PAGE_CACHE_SHIFT;
	sb->s_magic		= AFS_FS_MAGIC;
	sb->s_op		= &afs_super_ops;
	sb->s_fs_info		= as;

	/* allocate the root inode and dentry */
	fid.vid		= as->volume->vid;
	fid.vnode	= 1;
	fid.unique	= 1;
	inode = afs_iget(sb, params->key, &fid, NULL, NULL);
	if (IS_ERR(inode))
		goto error_inode;

	ret = -ENOMEM;
	root = d_alloc_root(inode);
	if (!root)
		goto error;

	sb->s_root = root;

	_leave(" = 0");
	return 0;

error_inode:
	ret = PTR_ERR(inode);
	inode = NULL;
error:
	iput(inode);
	afs_put_volume(as->volume);
	kfree(as);

	sb->s_fs_info = NULL;

	_leave(" = %d", ret);
	return ret;
}

/*
 * get an AFS superblock
 */
static int afs_get_sb(struct file_system_type *fs_type,
		      int flags,
		      const char *dev_name,
		      void *options,
		      struct vfsmount *mnt)
{
	struct afs_mount_params params;
	struct super_block *sb;
	struct afs_volume *vol;
	struct key *key;
	int ret;

	_enter(",,%s,%p", dev_name, options);

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

	/* parse the options and device name */
	if (options) {
		ret = afs_parse_options(&params, options, &dev_name);
		if (ret < 0)
			goto error;
	}

	ret = afs_parse_device_name(&params, dev_name);
	if (ret < 0)
		goto error;

	/* try and do the mount securely */
	key = afs_request_key(params.cell);
	if (IS_ERR(key)) {
		_leave(" = %ld [key]", PTR_ERR(key));
		ret = PTR_ERR(key);
		goto error;
	}
	params.key = key;

	/* parse the device name */
	vol = afs_volume_lookup(&params);
	if (IS_ERR(vol)) {
		ret = PTR_ERR(vol);
		goto error;
	}
	params.volume = vol;

	/* allocate a deviceless superblock */
	sb = sget(fs_type, afs_test_super, set_anon_super, &params);
	if (IS_ERR(sb)) {
		ret = PTR_ERR(sb);
		goto error;
	}

	if (!sb->s_root) {
		/* initial superblock/root creation */
		_debug("create");
		sb->s_flags = flags;
		ret = afs_fill_super(sb, &params);
		if (ret < 0) {
			up_write(&sb->s_umount);
			deactivate_super(sb);
			goto error;
		}
		sb->s_flags |= MS_ACTIVE;
	} else {
		_debug("reuse");
		ASSERTCMP(sb->s_flags, &, MS_ACTIVE);
	}

	simple_set_mnt(mnt, sb);
	afs_put_volume(params.volume);
	afs_put_cell(params.cell);
	_leave(" = 0 [%p]", sb);
	return 0;

error:
	afs_put_volume(params.volume);
	afs_put_cell(params.cell);
	key_put(params.key);
	_leave(" = %d", ret);
	return ret;
}

/*
 * finish the unmounting process on the superblock
 */
static void afs_put_super(struct super_block *sb)
{
	struct afs_super_info *as = sb->s_fs_info;

	_enter("");

	afs_put_volume(as->volume);

	_leave("");
}

/*
 * initialise an inode cache slab element prior to any use
 */
static void afs_i_init_once(void *_vnode, struct kmem_cache *cachep,
			    unsigned long flags)
{
	struct afs_vnode *vnode = _vnode;

	memset(vnode, 0, sizeof(*vnode));
	inode_init_once(&vnode->vfs_inode);
	init_waitqueue_head(&vnode->update_waitq);
	mutex_init(&vnode->permits_lock);
	mutex_init(&vnode->validate_lock);
	spin_lock_init(&vnode->writeback_lock);
	spin_lock_init(&vnode->lock);
	INIT_LIST_HEAD(&vnode->writebacks);
	INIT_WORK(&vnode->cb_broken_work, afs_broken_callback_work);
}

/*
 * allocate an AFS inode struct from our slab cache
 */
static struct inode *afs_alloc_inode(struct super_block *sb)
{
	struct afs_vnode *vnode;

	vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
	if (!vnode)
		return NULL;

	atomic_inc(&afs_count_active_inodes);

	memset(&vnode->fid, 0, sizeof(vnode->fid));
	memset(&vnode->status, 0, sizeof(vnode->status));

	vnode->volume		= NULL;
	vnode->update_cnt	= 0;
	vnode->flags		= 1 << AFS_VNODE_UNSET;
	vnode->cb_promised	= false;

	_leave(" = %p", &vnode->vfs_inode);
	return &vnode->vfs_inode;
}

/*
 * destroy an AFS inode struct
 */
static void afs_destroy_inode(struct inode *inode)
{
	struct afs_vnode *vnode = AFS_FS_I(inode);

	_enter("%p{%x:%u}", inode, vnode->fid.vid, vnode->fid.vnode);

	_debug("DESTROY INODE %p", inode);

	ASSERTCMP(vnode->server, ==, NULL);

	kmem_cache_free(afs_inode_cachep, vnode);
	atomic_dec(&afs_count_active_inodes);
}

/*
 * return information about an AFS volume
 */
static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct afs_volume_status vs;
	struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode);
	struct key *key;
	int ret;

	key = afs_request_key(vnode->volume->cell);
	if (IS_ERR(key))
		return PTR_ERR(key);

	ret = afs_vnode_get_volume_status(vnode, key, &vs);
	key_put(key);
	if (ret < 0) {
		_leave(" = %d", ret);
		return ret;
	}

	buf->f_type	= dentry->d_sb->s_magic;
	buf->f_bsize	= AFS_BLOCK_SIZE;
	buf->f_namelen	= AFSNAMEMAX - 1;

	if (vs.max_quota == 0)
		buf->f_blocks = vs.part_max_blocks;
	else
		buf->f_blocks = vs.max_quota;
	buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use;
	return 0;
}
Commit	Line	Data
ec26815a DH	1	/* AFS superblock handling
ec26815a DH	2	*
08e0e7c8	3	* Copyright (c) 2002, 2007 Red Hat, Inc. All rights reserved.
1da177e4 LT	4	*
	5	* This software may be freely redistributed under the terms of the
	6	* GNU General Public License.
	7	*
	8	* You should have received a copy of the GNU General Public License
	9	* along with this program; if not, write to the Free Software
	10	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	11	*
	12	* Authors: David Howells <[email protected]>
ec26815a	13	* David Woodhouse <[email protected]>
1da177e4 LT	14	*
	15	*/
	16
	17	#include <linux/kernel.h>
	18	#include <linux/module.h>
	19	#include <linux/init.h>
	20	#include <linux/slab.h>
	21	#include <linux/fs.h>
	22	#include <linux/pagemap.h>
80c72fe4	23	#include <linux/parser.h>
45222b9e	24	#include <linux/statfs.h>
e8edc6e0	25	#include <linux/sched.h>
1da177e4 LT	26	#include "internal.h"
	27
	28	#define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */
	29
e18b890b	30	static void afs_i_init_once(void foo, struct kmem_cache cachep,
1da177e4	31	unsigned long flags);
454e2398 DH	32	static int afs_get_sb(struct file_system_type *fs_type,
	33	int flags, const char *dev_name,
	34	void data, struct vfsmount mnt);
1da177e4	35	static struct inode afs_alloc_inode(struct super_block sb);
1da177e4	36	static void afs_put_super(struct super_block *sb);
1da177e4	37	static void afs_destroy_inode(struct inode *inode);
45222b9e	38	static int afs_statfs(struct dentry dentry, struct kstatfs buf);
1da177e4	39
1f5ce9e9	40	struct file_system_type afs_fs_type = {
1da177e4 LT	41	.owner = THIS_MODULE,
	42	.name = "afs",
	43	.get_sb = afs_get_sb,
	44	.kill_sb = kill_anon_super,
80c72fe4	45	.fs_flags = 0,
1da177e4 LT	46	};
1da177e4 LT	47
ee9b6d61	48	static const struct super_operations afs_super_ops = {
45222b9e	49	.statfs = afs_statfs,
1da177e4	50	.alloc_inode = afs_alloc_inode,
31143d5d	51	.write_inode = afs_write_inode,
1da177e4 LT	52	.destroy_inode = afs_destroy_inode,
1da177e4 LT	53	.clear_inode = afs_clear_inode,
08e0e7c8	54	.umount_begin = afs_umount_begin,
1da177e4 LT	55	.put_super = afs_put_super,
	56	};
	57
e18b890b	58	static struct kmem_cache *afs_inode_cachep;
1da177e4 LT	59	static atomic_t afs_count_active_inodes;
1da177e4 LT	60
80c72fe4 DH	61	enum {
	62	afs_no_opt,
	63	afs_opt_cell,
	64	afs_opt_rwpath,
	65	afs_opt_vol,
	66	};
	67
31143d5d	68	static match_table_t afs_options_list = {
80c72fe4 DH	69	{ afs_opt_cell, "cell=%s" },
	70	{ afs_opt_rwpath, "rwpath" },
	71	{ afs_opt_vol, "vol=%s" },
	72	{ afs_no_opt, NULL },
	73	};
	74
1da177e4 LT	75	/*
	76	* initialise the filesystem
	77	*/
	78	int __init afs_fs_init(void)
	79	{
	80	int ret;
	81
	82	_enter("");
	83
1da177e4 LT	84	/* create ourselves an inode cache */
	85	atomic_set(&afs_count_active_inodes, 0);
	86
	87	ret = -ENOMEM;
	88	afs_inode_cachep = kmem_cache_create("afs_inode_cache",
	89	sizeof(struct afs_vnode),
	90	0,
	91	SLAB_HWCACHE_ALIGN,
	92	afs_i_init_once,
	93	NULL);
	94	if (!afs_inode_cachep) {
	95	printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n");
	96	return ret;
	97	}
	98
	99	/* now export our filesystem to lesser mortals */
	100	ret = register_filesystem(&afs_fs_type);
	101	if (ret < 0) {
	102	kmem_cache_destroy(afs_inode_cachep);
08e0e7c8	103	_leave(" = %d", ret);
1da177e4 LT	104	return ret;
	105	}
	106
08e0e7c8	107	_leave(" = 0");
1da177e4	108	return 0;
ec26815a	109	}
1da177e4	110
1da177e4 LT	111	/*
	112	* clean up the filesystem
	113	*/
	114	void __exit afs_fs_exit(void)
	115	{
08e0e7c8 DH	116	_enter("");
	117
	118	afs_mntpt_kill_timer();
1da177e4 LT	119	unregister_filesystem(&afs_fs_type);
	120
	121	if (atomic_read(&afs_count_active_inodes) != 0) {
	122	printk("kAFS: %d active inode objects still present\n",
	123	atomic_read(&afs_count_active_inodes));
	124	BUG();
	125	}
	126
	127	kmem_cache_destroy(afs_inode_cachep);
08e0e7c8	128	_leave("");
ec26815a	129	}
1da177e4	130
1da177e4 LT	131	/*
	132	* parse the mount options
	133	* - this function has been shamelessly adapted from the ext3 fs which
	134	* shamelessly adapted it from the msdos fs
	135	*/
00d3b7a4 DH	136	static int afs_parse_options(struct afs_mount_params *params,
00d3b7a4 DH	137	char options, const char *devname)
1da177e4	138	{
08e0e7c8	139	struct afs_cell *cell;
80c72fe4 DH	140	substring_t args[MAX_OPT_ARGS];
	141	char *p;
	142	int token;
1da177e4 LT	143
	144	_enter("%s", options);
	145
	146	options[PAGE_SIZE - 1] = 0;
	147
80c72fe4 DH	148	while ((p = strsep(&options, ","))) {
	149	if (!*p)
	150	continue;
1da177e4	151
80c72fe4 DH	152	token = match_token(p, afs_options_list, args);
	153	switch (token) {
	154	case afs_opt_cell:
	155	cell = afs_cell_lookup(args[0].from,
	156	args[0].to - args[0].from);
08e0e7c8 DH	157	if (IS_ERR(cell))
08e0e7c8 DH	158	return PTR_ERR(cell);
00d3b7a4 DH	159	afs_put_cell(params->cell);
00d3b7a4 DH	160	params->cell = cell;
80c72fe4 DH	161	break;
	162
	163	case afs_opt_rwpath:
	164	params->rwpath = 1;
	165	break;
	166
	167	case afs_opt_vol:
	168	*devname = args[0].from;
	169	break;
	170
	171	default:
	172	printk(KERN_ERR "kAFS:"
	173	" Unknown or invalid mount option: '%s'\n", p);
	174	return -EINVAL;
1da177e4	175	}
1da177e4 LT	176	}
1da177e4 LT	177
80c72fe4 DH	178	_leave(" = 0");
80c72fe4 DH	179	return 0;
ec26815a	180	}
1da177e4	181
00d3b7a4 DH	182	/*
	183	* parse a device name to get cell name, volume name, volume type and R/W
	184	* selector
	185	* - this can be one of the following:
	186	* "%[cell:]volume[.]" R/W volume
	187	* "#[cell:]volume[.]" R/O or R/W volume (rwpath=0),
	188	* or R/W (rwpath=1) volume
	189	* "%[cell:]volume.readonly" R/O volume
	190	* "#[cell:]volume.readonly" R/O volume
	191	* "%[cell:]volume.backup" Backup volume
	192	* "#[cell:]volume.backup" Backup volume
	193	*/
	194	static int afs_parse_device_name(struct afs_mount_params *params,
	195	const char *name)
	196	{
	197	struct afs_cell *cell;
	198	const char cellname, suffix;
	199	int cellnamesz;
	200
	201	_enter(",%s", name);
	202
	203	if (!name) {
	204	printk(KERN_ERR "kAFS: no volume name specified\n");
	205	return -EINVAL;
	206	}
	207
	208	if ((name[0] != '%' && name[0] != '#') \|\| !name[1]) {
	209	printk(KERN_ERR "kAFS: unparsable volume name\n");
	210	return -EINVAL;
	211	}
	212
	213	/* determine the type of volume we're looking for */
	214	params->type = AFSVL_ROVOL;
	215	params->force = false;
	216	if (params->rwpath \|\| name[0] == '%') {
	217	params->type = AFSVL_RWVOL;
	218	params->force = true;
	219	}
	220	name++;
	221
	222	/* split the cell name out if there is one */
	223	params->volname = strchr(name, ':');
	224	if (params->volname) {
	225	cellname = name;
	226	cellnamesz = params->volname - name;
	227	params->volname++;
	228	} else {
	229	params->volname = name;
	230	cellname = NULL;
	231	cellnamesz = 0;
	232	}
	233
	234	/* the volume type is further affected by a possible suffix */
	235	suffix = strrchr(params->volname, '.');
	236	if (suffix) {
	237	if (strcmp(suffix, ".readonly") == 0) {
	238	params->type = AFSVL_ROVOL;
	239	params->force = true;
	240	} else if (strcmp(suffix, ".backup") == 0) {
	241	params->type = AFSVL_BACKVOL;
	242	params->force = true;
	243	} else if (suffix[1] == 0) {
	244	} else {
	245	suffix = NULL;
246	}
247	}
248
249	params->volnamesz = suffix ?
250	suffix - params->volname : strlen(params->volname);
251
252	_debug("cell %.s [%p]",
253	cellnamesz, cellnamesz, cellname ?: "", params->cell);
254
255	/* lookup the cell record */
256	if (cellname \|\| !params->cell) {
257	cell = afs_cell_lookup(cellname, cellnamesz);
258	if (IS_ERR(cell)) {
259	printk(KERN_ERR "kAFS: unable to lookup cell '%s'\n",
260	cellname ?: "");
261	return PTR_ERR(cell);
262	}
263	afs_put_cell(params->cell);
264	params->cell = cell;
265	}
266
267	_debug("CELL:%s [%p] VOLUME:%.s SUFFIX:%s TYPE:%d%s",
268	params->cell->name, params->cell,
269	params->volnamesz, params->volnamesz, params->volname,
270	suffix ?: "-", params->type, params->force ? " FORCE" : "");
271
272	return 0;
273	}
274
1da177e4 LT	275	/*
	276	* check a superblock to see if it's the one we're looking for
	277	*/
	278	static int afs_test_super(struct super_block sb, void data)
	279	{
	280	struct afs_mount_params *params = data;
	281	struct afs_super_info *as = sb->s_fs_info;
	282
	283	return as->volume == params->volume;
ec26815a	284	}
1da177e4	285
1da177e4 LT	286	/*
	287	* fill in the superblock
	288	*/
436058a4	289	static int afs_fill_super(struct super_block sb, void data)
1da177e4 LT	290	{
	291	struct afs_mount_params *params = data;
	292	struct afs_super_info *as = NULL;
	293	struct afs_fid fid;
	294	struct dentry *root = NULL;
	295	struct inode *inode = NULL;
	296	int ret;
	297
08e0e7c8	298	_enter("");
1da177e4 LT	299
1da177e4 LT	300	/* allocate a superblock info record */
b593e48d	301	as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
1da177e4 LT	302	if (!as) {
	303	_leave(" = -ENOMEM");
	304	return -ENOMEM;
	305	}
	306
1da177e4 LT	307	afs_get_volume(params->volume);
	308	as->volume = params->volume;
	309
	310	/* fill in the superblock */
	311	sb->s_blocksize = PAGE_CACHE_SIZE;
	312	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	313	sb->s_magic = AFS_FS_MAGIC;
	314	sb->s_op = &afs_super_ops;
	315	sb->s_fs_info = as;
	316
	317	/* allocate the root inode and dentry */
	318	fid.vid = as->volume->vid;
	319	fid.vnode = 1;
	320	fid.unique = 1;
260a9803	321	inode = afs_iget(sb, params->key, &fid, NULL, NULL);
08e0e7c8 DH	322	if (IS_ERR(inode))
08e0e7c8 DH	323	goto error_inode;
1da177e4 LT	324
	325	ret = -ENOMEM;
	326	root = d_alloc_root(inode);
	327	if (!root)
	328	goto error;
	329
	330	sb->s_root = root;
	331
08e0e7c8	332	_leave(" = 0");
1da177e4 LT	333	return 0;
1da177e4 LT	334
08e0e7c8 DH	335	error_inode:
	336	ret = PTR_ERR(inode);
	337	inode = NULL;
ec26815a	338	error:
1da177e4 LT	339	iput(inode);
	340	afs_put_volume(as->volume);
	341	kfree(as);
	342
	343	sb->s_fs_info = NULL;
	344
08e0e7c8	345	_leave(" = %d", ret);
1da177e4	346	return ret;
ec26815a	347	}
1da177e4	348
1da177e4 LT	349	/*
1da177e4 LT	350	* get an AFS superblock
1da177e4	351	*/
454e2398 DH	352	static int afs_get_sb(struct file_system_type *fs_type,
	353	int flags,
	354	const char *dev_name,
	355	void *options,
	356	struct vfsmount *mnt)
1da177e4 LT	357	{
	358	struct afs_mount_params params;
	359	struct super_block *sb;
08e0e7c8	360	struct afs_volume *vol;
00d3b7a4	361	struct key *key;
1da177e4 LT	362	int ret;
	363
	364	_enter(",,%s,%p", dev_name, options);
	365
	366	memset(&params, 0, sizeof(params));
	367
00d3b7a4	368	/* parse the options and device name */
1da177e4	369	if (options) {
00d3b7a4	370	ret = afs_parse_options(&params, options, &dev_name);
1da177e4 LT	371	if (ret < 0)
1da177e4 LT	372	goto error;
1da177e4 LT	373	}
1da177e4 LT	374
00d3b7a4 DH	375	ret = afs_parse_device_name(&params, dev_name);
	376	if (ret < 0)
	377	goto error;
	378
	379	/* try and do the mount securely */
	380	key = afs_request_key(params.cell);
	381	if (IS_ERR(key)) {
	382	_leave(" = %ld [key]", PTR_ERR(key));
	383	ret = PTR_ERR(key);
	384	goto error;
	385	}
	386	params.key = key;
	387
1da177e4	388	/* parse the device name */
00d3b7a4	389	vol = afs_volume_lookup(&params);
08e0e7c8 DH	390	if (IS_ERR(vol)) {
08e0e7c8 DH	391	ret = PTR_ERR(vol);
1da177e4	392	goto error;
08e0e7c8	393	}
08e0e7c8	394	params.volume = vol;
1da177e4 LT	395
	396	/* allocate a deviceless superblock */
	397	sb = sget(fs_type, afs_test_super, set_anon_super, &params);
08e0e7c8 DH	398	if (IS_ERR(sb)) {
08e0e7c8 DH	399	ret = PTR_ERR(sb);
1da177e4	400	goto error;
08e0e7c8	401	}
1da177e4	402
436058a4 DH	403	if (!sb->s_root) {
	404	/* initial superblock/root creation */
	405	_debug("create");
	406	sb->s_flags = flags;
	407	ret = afs_fill_super(sb, &params);
	408	if (ret < 0) {
	409	up_write(&sb->s_umount);
	410	deactivate_super(sb);
	411	goto error;
	412	}
	413	sb->s_flags \|= MS_ACTIVE;
	414	} else {
	415	_debug("reuse");
	416	ASSERTCMP(sb->s_flags, &, MS_ACTIVE);
1da177e4	417	}
1da177e4	418
436058a4	419	simple_set_mnt(mnt, sb);
1da177e4	420	afs_put_volume(params.volume);
00d3b7a4	421	afs_put_cell(params.cell);
08e0e7c8	422	_leave(" = 0 [%p]", sb);
454e2398	423	return 0;
1da177e4	424
ec26815a	425	error:
1da177e4	426	afs_put_volume(params.volume);
00d3b7a4 DH	427	afs_put_cell(params.cell);
00d3b7a4 DH	428	key_put(params.key);
1da177e4	429	_leave(" = %d", ret);
454e2398	430	return ret;
ec26815a	431	}
1da177e4	432
1da177e4 LT	433	/*
	434	* finish the unmounting process on the superblock
	435	*/
	436	static void afs_put_super(struct super_block *sb)
	437	{
	438	struct afs_super_info *as = sb->s_fs_info;
	439
	440	_enter("");
	441
	442	afs_put_volume(as->volume);
1da177e4 LT	443
1da177e4 LT	444	_leave("");
ec26815a	445	}
1da177e4	446
1da177e4 LT	447	/*
	448	* initialise an inode cache slab element prior to any use
	449	*/
e18b890b	450	static void afs_i_init_once(void _vnode, struct kmem_cache cachep,
1da177e4 LT	451	unsigned long flags)
1da177e4 LT	452	{
ec26815a	453	struct afs_vnode *vnode = _vnode;
1da177e4	454
a35afb83 CL	455	memset(vnode, 0, sizeof(*vnode));
	456	inode_init_once(&vnode->vfs_inode);
	457	init_waitqueue_head(&vnode->update_waitq);
	458	mutex_init(&vnode->permits_lock);
	459	mutex_init(&vnode->validate_lock);
	460	spin_lock_init(&vnode->writeback_lock);
	461	spin_lock_init(&vnode->lock);
	462	INIT_LIST_HEAD(&vnode->writebacks);
	463	INIT_WORK(&vnode->cb_broken_work, afs_broken_callback_work);
ec26815a	464	}
1da177e4	465
1da177e4 LT	466	/*
	467	* allocate an AFS inode struct from our slab cache
	468	*/
	469	static struct inode afs_alloc_inode(struct super_block sb)
	470	{
	471	struct afs_vnode *vnode;
	472
ec26815a	473	vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
1da177e4 LT	474	if (!vnode)
	475	return NULL;
	476
	477	atomic_inc(&afs_count_active_inodes);
	478
	479	memset(&vnode->fid, 0, sizeof(vnode->fid));
	480	memset(&vnode->status, 0, sizeof(vnode->status));
	481
	482	vnode->volume = NULL;
	483	vnode->update_cnt = 0;
260a9803	484	vnode->flags = 1 << AFS_VNODE_UNSET;
08e0e7c8	485	vnode->cb_promised = false;
1da177e4	486
0f300ca9	487	_leave(" = %p", &vnode->vfs_inode);
1da177e4	488	return &vnode->vfs_inode;
ec26815a	489	}
1da177e4	490
1da177e4 LT	491	/*
	492	* destroy an AFS inode struct
	493	*/
	494	static void afs_destroy_inode(struct inode *inode)
	495	{
08e0e7c8 DH	496	struct afs_vnode *vnode = AFS_FS_I(inode);
08e0e7c8 DH	497
0f300ca9	498	_enter("%p{%x:%u}", inode, vnode->fid.vid, vnode->fid.vnode);
1da177e4	499
08e0e7c8 DH	500	_debug("DESTROY INODE %p", inode);
	501
	502	ASSERTCMP(vnode->server, ==, NULL);
	503
	504	kmem_cache_free(afs_inode_cachep, vnode);
1da177e4	505	atomic_dec(&afs_count_active_inodes);
ec26815a	506	}
45222b9e DH	507
	508	/*
	509	* return information about an AFS volume
	510	*/
	511	static int afs_statfs(struct dentry dentry, struct kstatfs buf)
	512	{
	513	struct afs_volume_status vs;
	514	struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode);
	515	struct key *key;
	516	int ret;
	517
	518	key = afs_request_key(vnode->volume->cell);
	519	if (IS_ERR(key))
	520	return PTR_ERR(key);
	521
	522	ret = afs_vnode_get_volume_status(vnode, key, &vs);
	523	key_put(key);
	524	if (ret < 0) {
	525	_leave(" = %d", ret);
	526	return ret;
	527	}
	528
	529	buf->f_type = dentry->d_sb->s_magic;
	530	buf->f_bsize = AFS_BLOCK_SIZE;
	531	buf->f_namelen = AFSNAMEMAX - 1;
	532
	533	if (vs.max_quota == 0)
	534	buf->f_blocks = vs.part_max_blocks;
	535	else
	536	buf->f_blocks = vs.max_quota;
	537	buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use;
	538	return 0;
	539	}