[deliverable/linux.git] / fs / 9p / vfs_super.c

/*
 *  linux/fs/9p/vfs_super.c
 *
 * This file contians superblock ops for 9P2000. It is intended that
 * you mount this file system on directories.
 *
 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/inet.h>
#include <linux/pagemap.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/idr.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/statfs.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>

#include "v9fs.h"
#include "v9fs_vfs.h"
#include "fid.h"

static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl;

/**
 * v9fs_set_super - set the superblock
 * @s: super block
 * @data: file system specific data
 *
 */

static int v9fs_set_super(struct super_block *s, void *data)
{
	s->s_fs_info = data;
	return set_anon_super(s, data);
}

/**
 * v9fs_fill_super - populate superblock with info
 * @sb: superblock
 * @v9ses: session information
 * @flags: flags propagated from v9fs_get_sb()
 *
 */

static void
v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
		int flags, void *data)
{
	sb->s_maxbytes = MAX_LFS_FILESIZE;
	sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
	sb->s_blocksize = 1 << sb->s_blocksize_bits;
	sb->s_magic = V9FS_MAGIC;
	if (v9fs_proto_dotl(v9ses))
		sb->s_op = &v9fs_super_ops_dotl;
	else
		sb->s_op = &v9fs_super_ops;
	sb->s_bdi = &v9ses->bdi;

	sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC |
	    MS_NOATIME;

	save_mount_options(sb, data);
}

/**
 * v9fs_get_sb - mount a superblock
 * @fs_type: file system type
 * @flags: mount flags
 * @dev_name: device name that was mounted
 * @data: mount options
 * @mnt: mountpoint record to be instantiated
 *
 */

static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data,
		       struct vfsmount *mnt)
{
	struct super_block *sb = NULL;
	struct inode *inode = NULL;
	struct dentry *root = NULL;
	struct v9fs_session_info *v9ses = NULL;
	int mode = S_IRWXUGO | S_ISVTX;
	struct p9_fid *fid;
	int retval = 0;

	P9_DPRINTK(P9_DEBUG_VFS, " \n");

	v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
	if (!v9ses)
		return -ENOMEM;

	fid = v9fs_session_init(v9ses, dev_name, data);
	if (IS_ERR(fid)) {
		retval = PTR_ERR(fid);
		goto close_session;
	}

	sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
	if (IS_ERR(sb)) {
		retval = PTR_ERR(sb);
		goto clunk_fid;
	}
	v9fs_fill_super(sb, v9ses, flags, data);

	inode = v9fs_get_inode(sb, S_IFDIR | mode);
	if (IS_ERR(inode)) {
		retval = PTR_ERR(inode);
		goto release_sb;
	}

	root = d_alloc_root(inode);
	if (!root) {
		iput(inode);
		retval = -ENOMEM;
		goto release_sb;
	}

	sb->s_root = root;

	if (v9fs_proto_dotl(v9ses)) {
		struct p9_stat_dotl *st = NULL;
		st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
		if (IS_ERR(st)) {
			retval = PTR_ERR(st);
			goto clunk_fid;
		}

		v9fs_stat2inode_dotl(st, root->d_inode);
		kfree(st);
	} else {
		struct p9_wstat *st = NULL;
		st = p9_client_stat(fid);
		if (IS_ERR(st)) {
			retval = PTR_ERR(st);
			goto clunk_fid;
		}

		root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
		v9fs_stat2inode(st, root->d_inode, sb);

		p9stat_free(st);
		kfree(st);
	}

	v9fs_fid_add(root, fid);

P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n");
	simple_set_mnt(mnt, sb);
	return 0;

clunk_fid:
	p9_client_clunk(fid);

close_session:
	v9fs_session_close(v9ses);
	kfree(v9ses);
	return retval;

release_sb:
	deactivate_locked_super(sb);
	return retval;
}

/**
 * v9fs_kill_super - Kill Superblock
 * @s: superblock
 *
 */

static void v9fs_kill_super(struct super_block *s)
{
	struct v9fs_session_info *v9ses = s->s_fs_info;

	P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s);

	if (s->s_root)
		v9fs_dentry_release(s->s_root);	/* clunk root */

	kill_anon_super(s);

	v9fs_session_cancel(v9ses);
	v9fs_session_close(v9ses);
	kfree(v9ses);
	s->s_fs_info = NULL;
	P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n");
}

static void
v9fs_umount_begin(struct super_block *sb)
{
	struct v9fs_session_info *v9ses;

	v9ses = sb->s_fs_info;
	v9fs_session_begin_cancel(v9ses);
}

static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct v9fs_session_info *v9ses;
	struct p9_fid *fid;
	struct p9_rstatfs rs;
	int res;

	fid = v9fs_fid_lookup(dentry);
	if (IS_ERR(fid)) {
		res = PTR_ERR(fid);
		goto done;
	}

	v9ses = v9fs_inode2v9ses(dentry->d_inode);
	if (v9fs_proto_dotl(v9ses)) {
		res = p9_client_statfs(fid, &rs);
		if (res == 0) {
			buf->f_type = rs.type;
			buf->f_bsize = rs.bsize;
			buf->f_blocks = rs.blocks;
			buf->f_bfree = rs.bfree;
			buf->f_bavail = rs.bavail;
			buf->f_files = rs.files;
			buf->f_ffree = rs.ffree;
			buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL;
			buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL;
			buf->f_namelen = rs.namelen;
		}
		if (res != -ENOSYS)
			goto done;
	}
	res = simple_statfs(dentry, buf);
done:
	return res;
}

static const struct super_operations v9fs_super_ops = {
#ifdef CONFIG_9P_FSCACHE
	.alloc_inode = v9fs_alloc_inode,
	.destroy_inode = v9fs_destroy_inode,
#endif
	.statfs = simple_statfs,
	.clear_inode = v9fs_clear_inode,
	.show_options = generic_show_options,
	.umount_begin = v9fs_umount_begin,
};

static const struct super_operations v9fs_super_ops_dotl = {
#ifdef CONFIG_9P_FSCACHE
	.alloc_inode = v9fs_alloc_inode,
	.destroy_inode = v9fs_destroy_inode,
#endif
	.statfs = v9fs_statfs,
	.clear_inode = v9fs_clear_inode,
	.show_options = generic_show_options,
	.umount_begin = v9fs_umount_begin,
};

struct file_system_type v9fs_fs_type = {
	.name = "9p",
	.get_sb = v9fs_get_sb,
	.kill_sb = v9fs_kill_super,
	.owner = THIS_MODULE,
};
Commit	Line	Data
	1	/*
	2	* linux/fs/9p/vfs_super.c
	3	*
	4	* This file contians superblock ops for 9P2000. It is intended that
	5	* you mount this file system on directories.
	6	*
	7	* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
	8	* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2
	12	* as published by the Free Software Foundation.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to:
	21	* Free Software Foundation
	22	* 51 Franklin Street, Fifth Floor
	23	* Boston, MA 02111-1301 USA
	24	*
	25	*/
	26
	27	#include <linux/kernel.h>
	28	#include <linux/module.h>
	29	#include <linux/errno.h>
	30	#include <linux/fs.h>
	31	#include <linux/file.h>
	32	#include <linux/stat.h>
	33	#include <linux/string.h>
	34	#include <linux/inet.h>
	35	#include <linux/pagemap.h>
	36	#include <linux/seq_file.h>
	37	#include <linux/mount.h>
	38	#include <linux/idr.h>
	39	#include <linux/sched.h>
	40	#include <linux/slab.h>
	41	#include <linux/statfs.h>
	42	#include <net/9p/9p.h>
	43	#include <net/9p/client.h>
	44
	45	#include "v9fs.h"
	46	#include "v9fs_vfs.h"
	47	#include "fid.h"
	48
	49	static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl;
	50
	51	/**
	52	* v9fs_set_super - set the superblock
	53	* @s: super block
	54	* @data: file system specific data
	55	*
	56	*/
	57
	58	static int v9fs_set_super(struct super_block s, void data)
	59	{
	60	s->s_fs_info = data;
	61	return set_anon_super(s, data);
	62	}
	63
	64	/**
	65	* v9fs_fill_super - populate superblock with info
	66	* @sb: superblock
	67	* @v9ses: session information
	68	* @flags: flags propagated from v9fs_get_sb()
	69	*
	70	*/
	71
	72	static void
	73	v9fs_fill_super(struct super_block sb, struct v9fs_session_info v9ses,
	74	int flags, void *data)
	75	{
	76	sb->s_maxbytes = MAX_LFS_FILESIZE;
	77	sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
	78	sb->s_blocksize = 1 << sb->s_blocksize_bits;
	79	sb->s_magic = V9FS_MAGIC;
	80	if (v9fs_proto_dotl(v9ses))
	81	sb->s_op = &v9fs_super_ops_dotl;
	82	else
	83	sb->s_op = &v9fs_super_ops;
	84	sb->s_bdi = &v9ses->bdi;
	85
	86	sb->s_flags = flags \| MS_ACTIVE \| MS_SYNCHRONOUS \| MS_DIRSYNC \|
	87	MS_NOATIME;
	88
	89	save_mount_options(sb, data);
	90	}
	91
	92	/**
	93	* v9fs_get_sb - mount a superblock
	94	* @fs_type: file system type
	95	* @flags: mount flags
	96	* @dev_name: device name that was mounted
	97	* @data: mount options
	98	* @mnt: mountpoint record to be instantiated
	99	*
	100	*/
	101
	102	static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
	103	const char dev_name, void data,
	104	struct vfsmount *mnt)
	105	{
	106	struct super_block *sb = NULL;
	107	struct inode *inode = NULL;
	108	struct dentry *root = NULL;
	109	struct v9fs_session_info *v9ses = NULL;
	110	int mode = S_IRWXUGO \| S_ISVTX;
	111	struct p9_fid *fid;
	112	int retval = 0;
	113
	114	P9_DPRINTK(P9_DEBUG_VFS, " \n");
	115
	116	v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
	117	if (!v9ses)
	118	return -ENOMEM;
	119
	120	fid = v9fs_session_init(v9ses, dev_name, data);
	121	if (IS_ERR(fid)) {
	122	retval = PTR_ERR(fid);
	123	goto close_session;
	124	}
	125
	126	sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
	127	if (IS_ERR(sb)) {
	128	retval = PTR_ERR(sb);
	129	goto clunk_fid;
	130	}
	131	v9fs_fill_super(sb, v9ses, flags, data);
	132
	133	inode = v9fs_get_inode(sb, S_IFDIR \| mode);
	134	if (IS_ERR(inode)) {
	135	retval = PTR_ERR(inode);
	136	goto release_sb;
	137	}
	138
	139	root = d_alloc_root(inode);
	140	if (!root) {
	141	iput(inode);
	142	retval = -ENOMEM;
	143	goto release_sb;
	144	}
	145
	146	sb->s_root = root;
	147
	148	if (v9fs_proto_dotl(v9ses)) {
	149	struct p9_stat_dotl *st = NULL;
	150	st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
	151	if (IS_ERR(st)) {
	152	retval = PTR_ERR(st);
	153	goto clunk_fid;
	154	}
	155
	156	v9fs_stat2inode_dotl(st, root->d_inode);
	157	kfree(st);
	158	} else {
	159	struct p9_wstat *st = NULL;
	160	st = p9_client_stat(fid);
	161	if (IS_ERR(st)) {
	162	retval = PTR_ERR(st);
	163	goto clunk_fid;
	164	}
	165
	166	root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
	167	v9fs_stat2inode(st, root->d_inode, sb);
	168
	169	p9stat_free(st);
	170	kfree(st);
	171	}
	172
	173	v9fs_fid_add(root, fid);
	174
	175	P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n");
	176	simple_set_mnt(mnt, sb);
	177	return 0;
	178
	179	clunk_fid:
	180	p9_client_clunk(fid);
	181
	182	close_session:
	183	v9fs_session_close(v9ses);
	184	kfree(v9ses);
	185	return retval;
	186
	187	release_sb:
	188	deactivate_locked_super(sb);
	189	return retval;
	190	}
	191
	192	/**
	193	* v9fs_kill_super - Kill Superblock
	194	* @s: superblock
	195	*
	196	*/
	197
	198	static void v9fs_kill_super(struct super_block *s)
	199	{
	200	struct v9fs_session_info *v9ses = s->s_fs_info;
	201
	202	P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s);
	203
	204	if (s->s_root)
	205	v9fs_dentry_release(s->s_root); /* clunk root */
	206
	207	kill_anon_super(s);
	208
	209	v9fs_session_cancel(v9ses);
	210	v9fs_session_close(v9ses);
	211	kfree(v9ses);
	212	s->s_fs_info = NULL;
	213	P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n");
	214	}
	215
	216	static void
	217	v9fs_umount_begin(struct super_block *sb)
	218	{
	219	struct v9fs_session_info *v9ses;
	220
	221	v9ses = sb->s_fs_info;
	222	v9fs_session_begin_cancel(v9ses);
	223	}
	224
	225	static int v9fs_statfs(struct dentry dentry, struct kstatfs buf)
	226	{
	227	struct v9fs_session_info *v9ses;
	228	struct p9_fid *fid;
	229	struct p9_rstatfs rs;
	230	int res;
	231
	232	fid = v9fs_fid_lookup(dentry);
	233	if (IS_ERR(fid)) {
	234	res = PTR_ERR(fid);
	235	goto done;
	236	}
	237
	238	v9ses = v9fs_inode2v9ses(dentry->d_inode);
	239	if (v9fs_proto_dotl(v9ses)) {
	240	res = p9_client_statfs(fid, &rs);
	241	if (res == 0) {
	242	buf->f_type = rs.type;
	243	buf->f_bsize = rs.bsize;
	244	buf->f_blocks = rs.blocks;
	245	buf->f_bfree = rs.bfree;
	246	buf->f_bavail = rs.bavail;
	247	buf->f_files = rs.files;
	248	buf->f_ffree = rs.ffree;
	249	buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL;
	250	buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL;
	251	buf->f_namelen = rs.namelen;
	252	}
	253	if (res != -ENOSYS)
	254	goto done;
	255	}
	256	res = simple_statfs(dentry, buf);
	257	done:
	258	return res;
	259	}
	260
	261	static const struct super_operations v9fs_super_ops = {
	262	#ifdef CONFIG_9P_FSCACHE
	263	.alloc_inode = v9fs_alloc_inode,
	264	.destroy_inode = v9fs_destroy_inode,
	265	#endif
	266	.statfs = simple_statfs,
	267	.clear_inode = v9fs_clear_inode,
	268	.show_options = generic_show_options,
	269	.umount_begin = v9fs_umount_begin,
	270	};
	271
	272	static const struct super_operations v9fs_super_ops_dotl = {
	273	#ifdef CONFIG_9P_FSCACHE
	274	.alloc_inode = v9fs_alloc_inode,
	275	.destroy_inode = v9fs_destroy_inode,
	276	#endif
	277	.statfs = v9fs_statfs,
	278	.clear_inode = v9fs_clear_inode,
	279	.show_options = generic_show_options,
	280	.umount_begin = v9fs_umount_begin,
	281	};
	282
	283	struct file_system_type v9fs_fs_type = {
	284	.name = "9p",
	285	.get_sb = v9fs_get_sb,
	286	.kill_sb = v9fs_kill_super,
	287	.owner = THIS_MODULE,
	288	};