[mirror_zfs-debian.git] / module / zfs / zpl_inode.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2011, Lawrence Livermore National Security, LLC.
 */


#include <sys/zfs_vfsops.h>
#include <sys/zfs_vnops.h>
#include <sys/vfs.h>
#include <sys/zpl.h>


static struct dentry *
zpl_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
	struct inode *ip;
	cred_t *cr;
	int error;

	cr = (cred_t *)get_current_cred();
	error = -zfs_lookup(dir, dname(dentry), &ip, 0, cr, NULL, NULL);
	ASSERT3S(error, <=, 0);
	put_cred(cr);

	if (error) {
		if (error == -ENOENT)
			return d_splice_alias(NULL, dentry);
		else
			return ERR_PTR(error);
	}

	return d_splice_alias(ip, dentry);
}

static int
zpl_create(struct inode *dir, struct dentry *dentry, int mode,
    struct nameidata *nd)
{
	const struct cred *cred;
	struct inode *ip;
	vattr_t *vap;
	int error;

	cred = get_current_cred();
	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
	vap->va_mode = mode;
	vap->va_mask = ATTR_MODE;
	vap->va_uid = current_fsuid();
	vap->va_gid = current_fsgid();

	error = -zfs_create(dir, (char *)dentry->d_name.name,
	    vap, 0, mode, &ip, (struct cred *)cred, 0, NULL);
	if (error)
		goto out;

	d_instantiate(dentry, ip);
out:
	kmem_free(vap, sizeof(vattr_t));
	put_cred(cred);
	ASSERT3S(error, <=, 0);

	return (error);
}

static int
zpl_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
{
        const struct cred *cred;
	struct inode *ip;
	vattr_t *vap;
	int error;

	cred = get_current_cred();
	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
	vap->va_mode = mode;
	vap->va_mask = ATTR_MODE;
	vap->va_rdev = rdev;
	vap->va_uid = current_fsuid();
	vap->va_gid = current_fsgid();

	error = -zfs_create(dir, (char *)dentry->d_name.name,
	    vap, 0, mode, &ip, (struct cred *)cred, 0, NULL);
	if (error)
		goto out;

	d_instantiate(dentry, ip);
out:
	kmem_free(vap, sizeof(vattr_t));
	put_cred(cred);
	ASSERT3S(error, <=, 0);

	return (-error);
}

static int
zpl_unlink(struct inode *dir, struct dentry *dentry)
{
	cred_t *cr;
	int error;

	cr = (cred_t *)get_current_cred();
	error = -zfs_remove(dir, dname(dentry), cr);
	put_cred(cr);
	ASSERT3S(error, <=, 0);

	return (error);
}

static int
zpl_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
	cred_t *cr;
	vattr_t *vap;
	struct inode *ip;
	int error;

	cr = (cred_t *)get_current_cred();
	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
	vap->va_mode = S_IFDIR | mode;
	vap->va_mask = ATTR_MODE;
	vap->va_uid = current_fsuid();
	vap->va_gid = current_fsgid();

	error = -zfs_mkdir(dir, dname(dentry), vap, &ip, cr, 0, NULL);
	if (error)
		goto out;

	d_instantiate(dentry, ip);
out:
	kmem_free(vap, sizeof(vattr_t));
	put_cred(cr);
	ASSERT3S(error, <=, 0);

	return (error);
}

static int
zpl_rmdir(struct inode * dir, struct dentry *dentry)
{
	cred_t *cr;
	int error;

	cr = (cred_t *)get_current_cred();
	error = -zfs_rmdir(dir, dname(dentry), NULL, cr, 0);
	put_cred(cr);
	ASSERT3S(error, <=, 0);

	return (error);
}

static int
zpl_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
	cred_t *cr;
	int error;

	cr = (cred_t *)get_current_cred();
	error = -zfs_getattr(dentry->d_inode, stat, 0, cr);
	put_cred(cr);
	ASSERT3S(error, <=, 0);

	return (error);
}

static int
zpl_setattr(struct dentry *dentry, struct iattr *attr)
{
	cred_t *cr;
	int error;

	error = inode_change_ok(dentry->d_inode, attr);
	if (error)
		return (error);

	cr = (cred_t *)get_current_cred();
	error = -zfs_setattr(dentry->d_inode, attr, 0, cr);
	put_cred(cr);
	ASSERT3S(error, <=, 0);

	return (-error);
}

static int
zpl_rename(struct inode *sdip, struct dentry *sdentry,
    struct inode *tdip, struct dentry *tdentry)
{
	cred_t *cr;
	int error;

	cr = (cred_t *)get_current_cred();
	error = -zfs_rename(sdip, dname(sdentry), tdip, dname(tdentry), cr, 0);
	put_cred(cr);
	ASSERT3S(error, <=, 0);

	return (error);
}

static int
zpl_symlink(struct inode *dir, struct dentry *dentry, const char *name)
{
	cred_t *cr;
	vattr_t *vap;
	struct inode *ip;
	int error;

	cr = (cred_t *)get_current_cred();
	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
	vap->va_mode = S_IFLNK | S_IRWXUGO;
	vap->va_mask = ATTR_MODE;
	vap->va_uid = current_fsuid();
	vap->va_gid = current_fsgid();

	error = -zfs_symlink(dir, dname(dentry), vap, (char *)name, &ip, cr, 0);
	if (error)
		goto out;

	d_instantiate(dentry, ip);
out:
	kmem_free(vap, sizeof(vattr_t));
	put_cred(cr);
	ASSERT3S(error, <=, 0);

	return (error);
}

static void *
zpl_follow_link(struct dentry *dentry, struct nameidata *nd)
{
	(void) zfs_follow_link(dentry, nd);
	return NULL;
}

static void
zpl_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
{
	char *link;

	link = nd_get_link(nd);
	if (!IS_ERR(link))
		kmem_free(link, MAXPATHLEN + 1);
}

static int
zpl_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
{
	struct inode *ip = old_dentry->d_inode;
	cred_t *cr;
	int error;

	if (ip->i_nlink >= ZFS_LINK_MAX)
		return -EMLINK;

	cr = (cred_t *)get_current_cred();
	ip->i_ctime = CURRENT_TIME_SEC;
	igrab(ip); /* Use ihold() if available */

	error = -zfs_link(dir, ip, dname(dentry), cr);
	if (error) {
		iput(ip);
		goto out;
	}

	d_instantiate(dentry, ip);
out:
	put_cred(cr);
	ASSERT3S(error, <=, 0);

	return (error);
}

const struct inode_operations zpl_inode_operations = {
	.check_acl	= NULL,
	.create		= zpl_create,
	.link		= zpl_link,
	.unlink		= zpl_unlink,
	.symlink	= zpl_symlink,
	.mkdir		= zpl_mkdir,
	.rmdir		= zpl_rmdir,
	.mknod		= zpl_mknod,
	.rename		= zpl_rename,
	.setattr	= zpl_setattr,
	.getattr	= zpl_getattr,
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.removexattr	= generic_removexattr,
	.listxattr	= zpl_xattr_list,
};

const struct inode_operations zpl_dir_inode_operations = {
	.check_acl	= NULL,
	.create		= zpl_create,
	.lookup		= zpl_lookup,
	.link		= zpl_link,
	.unlink		= zpl_unlink,
	.symlink	= zpl_symlink,
	.mkdir		= zpl_mkdir,
	.rmdir		= zpl_rmdir,
	.mknod		= zpl_mknod,
	.rename		= zpl_rename,
	.setattr	= zpl_setattr,
};

const struct inode_operations zpl_symlink_inode_operations = {
	.check_acl	= NULL,
	.readlink	= generic_readlink,
	.follow_link	= zpl_follow_link,
	.put_link	= zpl_put_link,
};

const struct inode_operations zpl_special_inode_operations = {
	.check_acl	= NULL,
};
Commit	Line	Data
ee154f01 BB	1	/*
	2	* CDDL HEADER START
	3	*
	4	* The contents of this file are subject to the terms of the
	5	* Common Development and Distribution License (the "License").
	6	* You may not use this file except in compliance with the License.
	7	*
	8	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	9	* or http://www.opensolaris.org/os/licensing.
	10	* See the License for the specific language governing permissions
	11	* and limitations under the License.
	12	*
	13	* When distributing Covered Code, include this CDDL HEADER in each
	14	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	15	* If applicable, add the following below this CDDL HEADER, with the
	16	* fields enclosed by brackets "[]" replaced with your own identifying
	17	* information: Portions Copyright [yyyy] [name of copyright owner]
	18	*
	19	* CDDL HEADER END
	20	*/
	21	/*
	22	* Copyright (c) 2011, Lawrence Livermore National Security, LLC.
	23	*/
	24
	25
	26	#include <sys/zfs_vfsops.h>
	27	#include <sys/zfs_vnops.h>
	28	#include <sys/vfs.h>
	29	#include <sys/zpl.h>
	30
	31
	32	static struct dentry *
	33	zpl_lookup(struct inode dir, struct dentry dentry, struct nameidata *nd)
	34	{
	35	struct inode *ip;
	36	cred_t *cr;
	37	int error;
	38
	39	cr = (cred_t *)get_current_cred();
	40	error = -zfs_lookup(dir, dname(dentry), &ip, 0, cr, NULL, NULL);
	41	ASSERT3S(error, <=, 0);
	42	put_cred(cr);
	43
	44	if (error) {
	45	if (error == -ENOENT)
	46	return d_splice_alias(NULL, dentry);
	47	else
	48	return ERR_PTR(error);
	49	}
	50
	51	return d_splice_alias(ip, dentry);
	52	}
	53
	54	static int
	55	zpl_create(struct inode dir, struct dentry dentry, int mode,
	56	struct nameidata *nd)
	57	{
	58	const struct cred *cred;
	59	struct inode *ip;
	60	vattr_t *vap;
	61	int error;
	62
	63	cred = get_current_cred();
	64	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
65	vap->va_mode = mode;
66	vap->va_mask = ATTR_MODE;
67	vap->va_uid = current_fsuid();
68	vap->va_gid = current_fsgid();
69
70	error = -zfs_create(dir, (char *)dentry->d_name.name,
71	vap, 0, mode, &ip, (struct cred *)cred, 0, NULL);
72	if (error)
73	goto out;
74
75	d_instantiate(dentry, ip);
76	out:
77	kmem_free(vap, sizeof(vattr_t));
78	put_cred(cred);
79	ASSERT3S(error, <=, 0);
80
81	return (error);
82	}
83
84	static int
85	zpl_mknod(struct inode dir, struct dentry dentry, int mode, dev_t rdev)
86	{
87	const struct cred *cred;
88	struct inode *ip;
89	vattr_t *vap;
90	int error;
91
92	cred = get_current_cred();
93	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
94	vap->va_mode = mode;
95	vap->va_mask = ATTR_MODE;
96	vap->va_rdev = rdev;
97	vap->va_uid = current_fsuid();
98	vap->va_gid = current_fsgid();
99
100	error = -zfs_create(dir, (char *)dentry->d_name.name,
101	vap, 0, mode, &ip, (struct cred *)cred, 0, NULL);
102	if (error)
103	goto out;
104
105	d_instantiate(dentry, ip);
106	out:
107	kmem_free(vap, sizeof(vattr_t));
108	put_cred(cred);
109	ASSERT3S(error, <=, 0);
110
111	return (-error);
112	}
113
114	static int
115	zpl_unlink(struct inode dir, struct dentry dentry)
116	{
117	cred_t *cr;
118	int error;
119
120	cr = (cred_t *)get_current_cred();
121	error = -zfs_remove(dir, dname(dentry), cr);
122	put_cred(cr);
123	ASSERT3S(error, <=, 0);
124
125	return (error);
126	}
127
128	static int
129	zpl_mkdir(struct inode dir, struct dentry dentry, int mode)
130	{
131	cred_t *cr;
132	vattr_t *vap;
133	struct inode *ip;
134	int error;
135
136	cr = (cred_t *)get_current_cred();
137	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
138	vap->va_mode = S_IFDIR \| mode;
139	vap->va_mask = ATTR_MODE;
140	vap->va_uid = current_fsuid();
141	vap->va_gid = current_fsgid();
142
143	error = -zfs_mkdir(dir, dname(dentry), vap, &ip, cr, 0, NULL);
144	if (error)
145	goto out;
146
147	d_instantiate(dentry, ip);
148	out:
149	kmem_free(vap, sizeof(vattr_t));
150	put_cred(cr);
151	ASSERT3S(error, <=, 0);
152
153	return (error);
154	}
155
156	static int
157	zpl_rmdir(struct inode * dir, struct dentry *dentry)
158	{
159	cred_t *cr;
160	int error;
161
162	cr = (cred_t *)get_current_cred();
163	error = -zfs_rmdir(dir, dname(dentry), NULL, cr, 0);
164	put_cred(cr);
165	ASSERT3S(error, <=, 0);
166
167	return (error);
168	}
169
170	static int
171	zpl_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
172	{
173	cred_t *cr;
174	int error;
175
176	cr = (cred_t *)get_current_cred();
177	error = -zfs_getattr(dentry->d_inode, stat, 0, cr);
178	put_cred(cr);
179	ASSERT3S(error, <=, 0);
180
181	return (error);
182	}
183
184	static int
185	zpl_setattr(struct dentry dentry, struct iattr attr)
186	{
187	cred_t *cr;
188	int error;
189
190	error = inode_change_ok(dentry->d_inode, attr);
191	if (error)
192	return (error);
193
194	cr = (cred_t *)get_current_cred();
195	error = -zfs_setattr(dentry->d_inode, attr, 0, cr);
196	put_cred(cr);
197	ASSERT3S(error, <=, 0);
198
199	return (-error);
200	}
201
202	static int
203	zpl_rename(struct inode sdip, struct dentry sdentry,
204	struct inode tdip, struct dentry tdentry)
205	{
206	cred_t *cr;
207	int error;
208
209	cr = (cred_t *)get_current_cred();
210	error = -zfs_rename(sdip, dname(sdentry), tdip, dname(tdentry), cr, 0);
211	put_cred(cr);
212	ASSERT3S(error, <=, 0);
213
214	return (error);
215	}
216
217	static int
218	zpl_symlink(struct inode dir, struct dentry dentry, const char *name)
219	{
220	cred_t *cr;
221	vattr_t *vap;
222	struct inode *ip;
223	int error;
224
225	cr = (cred_t *)get_current_cred();
226	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
227	vap->va_mode = S_IFLNK \| S_IRWXUGO;
228	vap->va_mask = ATTR_MODE;
229	vap->va_uid = current_fsuid();
230	vap->va_gid = current_fsgid();
231
232	error = -zfs_symlink(dir, dname(dentry), vap, (char *)name, &ip, cr, 0);
233	if (error)
234	goto out;
235
236	d_instantiate(dentry, ip);
237	out:
238	kmem_free(vap, sizeof(vattr_t));
239	put_cred(cr);
240	ASSERT3S(error, <=, 0);
241
242	return (error);
243	}
244
245	static void *
246	zpl_follow_link(struct dentry dentry, struct nameidata nd)
247	{
248	(void) zfs_follow_link(dentry, nd);
249	return NULL;
250	}
251
252	static void
253	zpl_put_link(struct dentry dentry, struct nameidata nd, void *ptr)
254	{
255	char *link;
256
257	link = nd_get_link(nd);
258	if (!IS_ERR(link))
259	kmem_free(link, MAXPATHLEN + 1);
260	}
261
262	static int
263	zpl_link(struct dentry old_dentry, struct inode dir, struct dentry *dentry)
264	{
265	struct inode *ip = old_dentry->d_inode;
266	cred_t *cr;
267	int error;
268
269	if (ip->i_nlink >= ZFS_LINK_MAX)
270	return -EMLINK;
271
272	cr = (cred_t *)get_current_cred();
273	ip->i_ctime = CURRENT_TIME_SEC;
274	igrab(ip); /* Use ihold() if available */
275
276	error = -zfs_link(dir, ip, dname(dentry), cr);
277	if (error) {
278	iput(ip);
279	goto out;
280	}
281
282	d_instantiate(dentry, ip);
283	out:
284	put_cred(cr);
285	ASSERT3S(error, <=, 0);
286
287	return (error);
288	}
289
290	const struct inode_operations zpl_inode_operations = {
291	.check_acl = NULL,
292	.create = zpl_create,
293	.link = zpl_link,
294	.unlink = zpl_unlink,
295	.symlink = zpl_symlink,
296	.mkdir = zpl_mkdir,
297	.rmdir = zpl_rmdir,
298	.mknod = zpl_mknod,
299	.rename = zpl_rename,
300	.setattr = zpl_setattr,
301	.getattr = zpl_getattr,
302	.setxattr = generic_setxattr,
303	.getxattr = generic_getxattr,
304	.removexattr = generic_removexattr,
305	.listxattr = zpl_xattr_list,
306	};
307
308	const struct inode_operations zpl_dir_inode_operations = {
309	.check_acl = NULL,
310	.create = zpl_create,
311	.lookup = zpl_lookup,
312	.link = zpl_link,
313	.unlink = zpl_unlink,
314	.symlink = zpl_symlink,
315	.mkdir = zpl_mkdir,
316	.rmdir = zpl_rmdir,
317	.mknod = zpl_mknod,
318	.rename = zpl_rename,
319	.setattr = zpl_setattr,
320	};
321
322	const struct inode_operations zpl_symlink_inode_operations = {
323	.check_acl = NULL,
324	.readlink = generic_readlink,
325	.follow_link = zpl_follow_link,
326	.put_link = zpl_put_link,
327	};
328
329	const struct inode_operations zpl_special_inode_operations = {
330	.check_acl = NULL,
331	};