[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / fs / afs / inode.c

/*
 * Copyright (c) 2002 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 Woodhouse <dwmw2@cambridge.redhat.com>
 *          David Howells <dhowells@redhat.com>
 *
 */

#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 "internal.h"

struct afs_iget_data {
	struct afs_fid		fid;
	struct afs_volume	*volume;	/* volume on which resides */
};

/*
 * map the AFS file status to the inode member variables
 */
static int afs_inode_map_status(struct afs_vnode *vnode, struct key *key)
{
	struct inode *inode = AFS_VNODE_TO_I(vnode);

	_debug("FS: ft=%d lk=%d sz=%Zu ver=%Lu mod=%hu",
	       vnode->status.type,
	       vnode->status.nlink,
	       vnode->status.size,
	       vnode->status.data_version,
	       vnode->status.mode);

	switch (vnode->status.type) {
	case AFS_FTYPE_FILE:
		inode->i_mode	= S_IFREG | vnode->status.mode;
		inode->i_op	= &afs_file_inode_operations;
		inode->i_fop	= &afs_file_operations;
		break;
	case AFS_FTYPE_DIR:
		inode->i_mode	= S_IFDIR | vnode->status.mode;
		inode->i_op	= &afs_dir_inode_operations;
		inode->i_fop	= &afs_dir_file_operations;
		break;
	case AFS_FTYPE_SYMLINK:
		inode->i_mode	= S_IFLNK | vnode->status.mode;
		inode->i_op	= &page_symlink_inode_operations;
		break;
	default:
		printk("kAFS: AFS vnode with undefined type\n");
		return -EBADMSG;
	}

	inode->i_nlink		= vnode->status.nlink;
	inode->i_uid		= vnode->status.owner;
	inode->i_gid		= 0;
	inode->i_size		= vnode->status.size;
	inode->i_ctime.tv_sec	= vnode->status.mtime_server;
	inode->i_ctime.tv_nsec	= 0;
	inode->i_atime		= inode->i_mtime = inode->i_ctime;
	inode->i_blocks		= 0;
	inode->i_version	= vnode->fid.unique;
	inode->i_mapping->a_ops	= &afs_fs_aops;

	/* check to see whether a symbolic link is really a mountpoint */
	if (vnode->status.type == AFS_FTYPE_SYMLINK) {
		afs_mntpt_check_symlink(vnode, key);

		if (test_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags)) {
			inode->i_mode	= S_IFDIR | vnode->status.mode;
			inode->i_op	= &afs_mntpt_inode_operations;
			inode->i_fop	= &afs_mntpt_file_operations;
		}
	}

	return 0;
}

/*
 * iget5() comparator
 */
static int afs_iget5_test(struct inode *inode, void *opaque)
{
	struct afs_iget_data *data = opaque;

	return inode->i_ino == data->fid.vnode &&
		inode->i_version == data->fid.unique;
}

/*
 * iget5() inode initialiser
 */
static int afs_iget5_set(struct inode *inode, void *opaque)
{
	struct afs_iget_data *data = opaque;
	struct afs_vnode *vnode = AFS_FS_I(inode);

	inode->i_ino = data->fid.vnode;
	inode->i_version = data->fid.unique;
	vnode->fid = data->fid;
	vnode->volume = data->volume;

	return 0;
}

/*
 * inode retrieval
 */
inline struct inode *afs_iget(struct super_block *sb, struct key *key,
			      struct afs_fid *fid)
{
	struct afs_iget_data data = { .fid = *fid };
	struct afs_super_info *as;
	struct afs_vnode *vnode;
	struct inode *inode;
	int ret;

	_enter(",{%u,%u,%u},,", fid->vid, fid->vnode, fid->unique);

	as = sb->s_fs_info;
	data.volume = as->volume;

	inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
			     &data);
	if (!inode) {
		_leave(" = -ENOMEM");
		return ERR_PTR(-ENOMEM);
	}

	_debug("GOT INODE %p { vl=%x vn=%x, u=%x }",
	       inode, fid->vid, fid->vnode, fid->unique);

	vnode = AFS_FS_I(inode);

	/* deal with an existing inode */
	if (!(inode->i_state & I_NEW)) {
		_leave(" = %p", inode);
		return inode;
	}

#ifdef AFS_CACHING_SUPPORT
	/* set up caching before reading the status, as fetch-status reads the
	 * first page of symlinks to see if they're really mntpts */
	cachefs_acquire_cookie(vnode->volume->cache,
			       NULL,
			       vnode,
			       &vnode->cache);
#endif

	/* okay... it's a new inode */
	set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
	ret = afs_vnode_fetch_status(vnode, NULL, key);
	if (ret < 0)
		goto bad_inode;
	ret = afs_inode_map_status(vnode, key);
	if (ret < 0)
		goto bad_inode;

	/* success */
	inode->i_flags |= S_NOATIME;
	unlock_new_inode(inode);
	_leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
	return inode;

	/* failure */
bad_inode:
	make_bad_inode(inode);
	unlock_new_inode(inode);
	iput(inode);

	_leave(" = %d [bad]", ret);
	return ERR_PTR(ret);
}

/*
 * read the attributes of an inode
 */
int afs_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
		      struct kstat *stat)
{
	struct inode *inode;

	inode = dentry->d_inode;

	_enter("{ ino=%lu v=%lu }", inode->i_ino, inode->i_version);

	generic_fillattr(inode, stat);
	return 0;
}

/*
 * clear an AFS inode
 */
void afs_clear_inode(struct inode *inode)
{
	struct afs_permits *permits;
	struct afs_vnode *vnode;

	vnode = AFS_FS_I(inode);

	_enter("ino=%lu { vn=%08x v=%u x=%u t=%u }",
	       inode->i_ino,
	       vnode->fid.vnode,
	       vnode->cb_version,
	       vnode->cb_expiry,
	       vnode->cb_type);

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

	ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);

	afs_give_up_callback(vnode);

	if (vnode->server) {
		spin_lock(&vnode->server->fs_lock);
		rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes);
		spin_unlock(&vnode->server->fs_lock);
		afs_put_server(vnode->server);
		vnode->server = NULL;
	}

	ASSERT(!vnode->cb_promised);

#ifdef AFS_CACHING_SUPPORT
	cachefs_relinquish_cookie(vnode->cache, 0);
	vnode->cache = NULL;
#endif

	mutex_lock(&vnode->permits_lock);
	permits = vnode->permits;
	rcu_assign_pointer(vnode->permits, NULL);
	mutex_unlock(&vnode->permits_lock);
	if (permits)
		call_rcu(&permits->rcu, afs_zap_permits);

	_leave("");
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (c) 2002 Red Hat, Inc. All rights reserved.
	3	*
	4	* This software may be freely redistributed under the terms of the
	5	* GNU General Public License.
	6	*
	7	* You should have received a copy of the GNU General Public License
	8	* along with this program; if not, write to the Free Software
	9	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	10	*
	11	* Authors: David Woodhouse <dwmw2@cambridge.redhat.com>
	12	* David Howells <dhowells@redhat.com>
	13	*
	14	*/
	15
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/init.h>
1da177e4 LT	19	#include <linux/slab.h>
	20	#include <linux/fs.h>
	21	#include <linux/pagemap.h>
1da177e4 LT	22	#include "internal.h"
	23
	24	struct afs_iget_data {
	25	struct afs_fid fid;
	26	struct afs_volume volume; / volume on which resides */
	27	};
	28
1da177e4 LT	29	/*
	30	* map the AFS file status to the inode member variables
	31	*/
00d3b7a4	32	static int afs_inode_map_status(struct afs_vnode vnode, struct key key)
1da177e4 LT	33	{
	34	struct inode *inode = AFS_VNODE_TO_I(vnode);
	35
	36	_debug("FS: ft=%d lk=%d sz=%Zu ver=%Lu mod=%hu",
	37	vnode->status.type,
	38	vnode->status.nlink,
	39	vnode->status.size,
08e0e7c8	40	vnode->status.data_version,
1da177e4 LT	41	vnode->status.mode);
	42
	43	switch (vnode->status.type) {
	44	case AFS_FTYPE_FILE:
	45	inode->i_mode = S_IFREG \| vnode->status.mode;
	46	inode->i_op = &afs_file_inode_operations;
00d3b7a4	47	inode->i_fop = &afs_file_operations;
1da177e4 LT	48	break;
	49	case AFS_FTYPE_DIR:
	50	inode->i_mode = S_IFDIR \| vnode->status.mode;
	51	inode->i_op = &afs_dir_inode_operations;
	52	inode->i_fop = &afs_dir_file_operations;
	53	break;
	54	case AFS_FTYPE_SYMLINK:
	55	inode->i_mode = S_IFLNK \| vnode->status.mode;
	56	inode->i_op = &page_symlink_inode_operations;
	57	break;
	58	default:
	59	printk("kAFS: AFS vnode with undefined type\n");
	60	return -EBADMSG;
	61	}
	62
	63	inode->i_nlink = vnode->status.nlink;
	64	inode->i_uid = vnode->status.owner;
	65	inode->i_gid = 0;
	66	inode->i_size = vnode->status.size;
	67	inode->i_ctime.tv_sec = vnode->status.mtime_server;
	68	inode->i_ctime.tv_nsec = 0;
	69	inode->i_atime = inode->i_mtime = inode->i_ctime;
1da177e4 LT	70	inode->i_blocks = 0;
	71	inode->i_version = vnode->fid.unique;
	72	inode->i_mapping->a_ops = &afs_fs_aops;
	73
	74	/* check to see whether a symbolic link is really a mountpoint */
	75	if (vnode->status.type == AFS_FTYPE_SYMLINK) {
00d3b7a4	76	afs_mntpt_check_symlink(vnode, key);
1da177e4	77
08e0e7c8	78	if (test_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags)) {
1da177e4 LT	79	inode->i_mode = S_IFDIR \| vnode->status.mode;
	80	inode->i_op = &afs_mntpt_inode_operations;
	81	inode->i_fop = &afs_mntpt_file_operations;
	82	}
	83	}
	84
	85	return 0;
ec26815a	86	}
1da177e4	87
1da177e4 LT	88	/*
	89	* iget5() comparator
	90	*/
	91	static int afs_iget5_test(struct inode inode, void opaque)
	92	{
	93	struct afs_iget_data *data = opaque;
	94
	95	return inode->i_ino == data->fid.vnode &&
	96	inode->i_version == data->fid.unique;
ec26815a	97	}
1da177e4	98
1da177e4 LT	99	/*
	100	* iget5() inode initialiser
	101	*/
	102	static int afs_iget5_set(struct inode inode, void opaque)
	103	{
	104	struct afs_iget_data *data = opaque;
	105	struct afs_vnode *vnode = AFS_FS_I(inode);
	106
	107	inode->i_ino = data->fid.vnode;
	108	inode->i_version = data->fid.unique;
	109	vnode->fid = data->fid;
	110	vnode->volume = data->volume;
	111
	112	return 0;
ec26815a	113	}
1da177e4	114
1da177e4 LT	115	/*
	116	* inode retrieval
	117	*/
00d3b7a4 DH	118	inline struct inode afs_iget(struct super_block sb, struct key *key,
00d3b7a4 DH	119	struct afs_fid *fid)
1da177e4 LT	120	{
	121	struct afs_iget_data data = { .fid = *fid };
	122	struct afs_super_info *as;
	123	struct afs_vnode *vnode;
	124	struct inode *inode;
	125	int ret;
	126
	127	_enter(",{%u,%u,%u},,", fid->vid, fid->vnode, fid->unique);
	128
	129	as = sb->s_fs_info;
	130	data.volume = as->volume;
	131
	132	inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
	133	&data);
	134	if (!inode) {
	135	_leave(" = -ENOMEM");
08e0e7c8	136	return ERR_PTR(-ENOMEM);
1da177e4 LT	137	}
1da177e4 LT	138
08e0e7c8 DH	139	_debug("GOT INODE %p { vl=%x vn=%x, u=%x }",
	140	inode, fid->vid, fid->vnode, fid->unique);
	141
1da177e4 LT	142	vnode = AFS_FS_I(inode);
	143
	144	/* deal with an existing inode */
	145	if (!(inode->i_state & I_NEW)) {
08e0e7c8 DH	146	_leave(" = %p", inode);
08e0e7c8 DH	147	return inode;
1da177e4 LT	148	}
	149
	150	#ifdef AFS_CACHING_SUPPORT
	151	/* set up caching before reading the status, as fetch-status reads the
	152	* first page of symlinks to see if they're really mntpts */
	153	cachefs_acquire_cookie(vnode->volume->cache,
	154	NULL,
	155	vnode,
	156	&vnode->cache);
	157	#endif
	158
	159	/* okay... it's a new inode */
08e0e7c8	160	set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
00d3b7a4	161	ret = afs_vnode_fetch_status(vnode, NULL, key);
08e0e7c8 DH	162	if (ret < 0)
08e0e7c8 DH	163	goto bad_inode;
00d3b7a4	164	ret = afs_inode_map_status(vnode, key);
08e0e7c8	165	if (ret < 0)
1da177e4 LT	166	goto bad_inode;
	167
	168	/* success */
08e0e7c8	169	inode->i_flags \|= S_NOATIME;
1da177e4	170	unlock_new_inode(inode);
08e0e7c8 DH	171	_leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
08e0e7c8 DH	172	return inode;
1da177e4 LT	173
1da177e4 LT	174	/* failure */
ec26815a	175	bad_inode:
1da177e4 LT	176	make_bad_inode(inode);
	177	unlock_new_inode(inode);
	178	iput(inode);
	179
	180	_leave(" = %d [bad]", ret);
08e0e7c8	181	return ERR_PTR(ret);
ec26815a	182	}
1da177e4	183
1da177e4 LT	184	/*
	185	* read the attributes of an inode
	186	*/
	187	int afs_inode_getattr(struct vfsmount mnt, struct dentry dentry,
	188	struct kstat *stat)
	189	{
1da177e4	190	struct inode *inode;
1da177e4 LT	191
	192	inode = dentry->d_inode;
	193
	194	_enter("{ ino=%lu v=%lu }", inode->i_ino, inode->i_version);
	195
1da177e4	196	generic_fillattr(inode, stat);
1da177e4	197	return 0;
ec26815a	198	}
1da177e4	199
1da177e4 LT	200	/*
	201	* clear an AFS inode
	202	*/
	203	void afs_clear_inode(struct inode *inode)
	204	{
00d3b7a4	205	struct afs_permits *permits;
1da177e4 LT	206	struct afs_vnode *vnode;
	207
	208	vnode = AFS_FS_I(inode);
	209
	210	_enter("ino=%lu { vn=%08x v=%u x=%u t=%u }",
	211	inode->i_ino,
	212	vnode->fid.vnode,
	213	vnode->cb_version,
	214	vnode->cb_expiry,
08e0e7c8	215	vnode->cb_type);
1da177e4	216
08e0e7c8 DH	217	_debug("CLEAR INODE %p", inode);
	218
	219	ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
	220
	221	afs_give_up_callback(vnode);
	222
	223	if (vnode->server) {
	224	spin_lock(&vnode->server->fs_lock);
	225	rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes);
	226	spin_unlock(&vnode->server->fs_lock);
	227	afs_put_server(vnode->server);
	228	vnode->server = NULL;
	229	}
1da177e4	230
08e0e7c8	231	ASSERT(!vnode->cb_promised);
1da177e4 LT	232
	233	#ifdef AFS_CACHING_SUPPORT
	234	cachefs_relinquish_cookie(vnode->cache, 0);
	235	vnode->cache = NULL;
	236	#endif
	237
00d3b7a4 DH	238	mutex_lock(&vnode->permits_lock);
	239	permits = vnode->permits;
	240	rcu_assign_pointer(vnode->permits, NULL);
	241	mutex_unlock(&vnode->permits_lock);
	242	if (permits)
	243	call_rcu(&permits->rcu, afs_zap_permits);
	244
1da177e4	245	_leave("");
ec26815a	246	}