[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/zfs_znode.h>
#include <sys/vfs.h>
#include <sys/zpl.h>


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

	crhold(cr);
	error = -zfs_lookup(dir, dname(dentry), &ip, 0, cr, NULL, NULL);
	ASSERT3S(error, <=, 0);
	crfree(cr);

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

	return d_splice_alias(ip, dentry);
}

void
zpl_vap_init(vattr_t *vap, struct inode *dir, struct dentry *dentry,
    zpl_umode_t mode, cred_t *cr)
{
	vap->va_mask = ATTR_MODE;
	vap->va_mode = mode;
	vap->va_dentry = dentry;
	vap->va_uid = crgetfsuid(cr);

	if (dir && dir->i_mode & S_ISGID) {
		vap->va_gid = dir->i_gid;
		if (S_ISDIR(mode))
			vap->va_mode |= S_ISGID;
	} else {
		vap->va_gid = crgetfsgid(cr);
	}
}

static int
zpl_create(struct inode *dir, struct dentry *dentry, zpl_umode_t mode,
    struct nameidata *nd)
{
	cred_t *cr = CRED();
	struct inode *ip;
	vattr_t *vap;
	int error;

	crhold(cr);
	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
	zpl_vap_init(vap, dir, dentry, mode, cr);

	error = -zfs_create(dir, (char *)dentry->d_name.name,
	    vap, 0, mode, &ip, cr, 0, NULL);
	kmem_free(vap, sizeof(vattr_t));
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
}

static int
zpl_mknod(struct inode *dir, struct dentry *dentry, zpl_umode_t mode,
    dev_t rdev)
{
	cred_t *cr = CRED();
	struct inode *ip;
	vattr_t *vap;
	int error;

	/*
	 * We currently expect Linux to supply rdev=0 for all sockets
	 * and fifos, but we want to know if this behavior ever changes.
	 */
	if (S_ISSOCK(mode) || S_ISFIFO(mode))
		ASSERT(rdev == 0);

	crhold(cr);
	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
	zpl_vap_init(vap, dir, dentry, mode, cr);
	vap->va_rdev = rdev;

	error = -zfs_create(dir, (char *)dentry->d_name.name,
	    vap, 0, mode, &ip, cr, 0, NULL);
	kmem_free(vap, sizeof(vattr_t));
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (-error);
}

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

	crhold(cr);
	error = -zfs_remove(dir, dname(dentry), cr);
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
}

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

	crhold(cr);
	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
	zpl_vap_init(vap, dir, dentry, mode | S_IFDIR, cr);

	error = -zfs_mkdir(dir, dname(dentry), vap, &ip, cr, 0, NULL);
	kmem_free(vap, sizeof(vattr_t));
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
}

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

	crhold(cr);
	error = -zfs_rmdir(dir, dname(dentry), NULL, cr, 0);
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
}

static int
zpl_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
	boolean_t issnap = ITOZSB(dentry->d_inode)->z_issnap;
	int error;

	/*
	 * Ensure MNT_SHRINKABLE is set on snapshots to ensure they are
	 * unmounted automatically with the parent file system.  This
	 * is done on the first getattr because it's not easy to get the
	 * vfsmount structure at mount time.  This call path is explicitly
	 * marked unlikely to avoid any performance impact.  FWIW, ext4
	 * resorts to a similar trick for sysadmin convenience.
	 */
	if (unlikely(issnap && !(mnt->mnt_flags & MNT_SHRINKABLE)))
		mnt->mnt_flags |= MNT_SHRINKABLE;

	error = -zfs_getattr_fast(dentry->d_inode, stat);
	ASSERT3S(error, <=, 0);

	return (error);
}

static int
zpl_setattr(struct dentry *dentry, struct iattr *ia)
{
	cred_t *cr = CRED();
	vattr_t *vap;
	int error;

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

	crhold(cr);
	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
	vap->va_mask = ia->ia_valid & ATTR_IATTR_MASK;
	vap->va_mode = ia->ia_mode;
	vap->va_uid = ia->ia_uid;
	vap->va_gid = ia->ia_gid;
	vap->va_size = ia->ia_size;
	vap->va_atime = ia->ia_atime;
	vap->va_mtime = ia->ia_mtime;
	vap->va_ctime = ia->ia_ctime;

	error = -zfs_setattr(dentry->d_inode, vap, 0, cr);

	kmem_free(vap, sizeof(vattr_t));
	crfree(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 = CRED();
	int error;

	crhold(cr);
	error = -zfs_rename(sdip, dname(sdentry), tdip, dname(tdentry), cr, 0);
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
}

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

	crhold(cr);
	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
	zpl_vap_init(vap, dir, dentry, S_IFLNK | S_IRWXUGO, cr);

	error = -zfs_symlink(dir, dname(dentry), vap, (char *)name, &ip, cr, 0);
	kmem_free(vap, sizeof(vattr_t));
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
}

static void *
zpl_follow_link(struct dentry *dentry, struct nameidata *nd)
{
	cred_t *cr = CRED();
	struct inode *ip = dentry->d_inode;
	struct iovec iov;
	uio_t uio;
	char *link;
	int error;

	crhold(cr);

	iov.iov_len = MAXPATHLEN;
	iov.iov_base = link = kmem_zalloc(MAXPATHLEN, KM_SLEEP);

	uio.uio_iov = &iov;
	uio.uio_iovcnt = 1;
	uio.uio_resid = (MAXPATHLEN - 1);
	uio.uio_segflg = UIO_SYSSPACE;

	error = -zfs_readlink(ip, &uio, cr);
	if (error) {
		kmem_free(link, MAXPATHLEN);
		nd_set_link(nd, ERR_PTR(error));
	} else {
		nd_set_link(nd, link);
	}

	crfree(cr);
	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);
}

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

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

	crhold(cr);
	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:
	crfree(cr);
	ASSERT3S(error, <=, 0);

	return (error);
}

static void
zpl_truncate_range(struct inode* ip, loff_t start, loff_t end)
{
	cred_t *cr = CRED();
	flock64_t bf;

	ASSERT3S(start, <=, end);

	/*
	 * zfs_freesp() will interpret (len == 0) as meaning "truncate until
	 * the end of the file". We don't want that.
	 */
	if (start == end)
		return;

	crhold(cr);

	bf.l_type = F_WRLCK;
	bf.l_whence = 0;
	bf.l_start = start;
	bf.l_len = end - start;
	bf.l_pid = 0;
	zfs_space(ip, F_FREESP, &bf, FWRITE, start, cr);

	crfree(cr);
}

#ifdef HAVE_INODE_FALLOCATE
static long
zpl_fallocate(struct inode *ip, int mode, loff_t offset, loff_t len)
{
	return zpl_fallocate_common(ip, mode, offset, len);
}
#endif /* HAVE_INODE_FALLOCATE */


const struct inode_operations zpl_inode_operations = {
	.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,
	.truncate_range = zpl_truncate_range,
#ifdef HAVE_INODE_FALLOCATE
	.fallocate	= zpl_fallocate,
#endif /* HAVE_INODE_FALLOCATE */
};

const struct inode_operations zpl_dir_inode_operations = {
	.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,
	.getattr	= zpl_getattr,
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.removexattr	= generic_removexattr,
	.listxattr	= zpl_xattr_list,
};

const struct inode_operations zpl_symlink_inode_operations = {
	.readlink	= generic_readlink,
	.follow_link	= zpl_follow_link,
	.put_link	= zpl_put_link,
	.setattr	= zpl_setattr,
	.getattr	= zpl_getattr,
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.removexattr	= generic_removexattr,
	.listxattr	= zpl_xattr_list,
};

const struct inode_operations zpl_special_inode_operations = {
	.setattr	= zpl_setattr,
	.getattr	= zpl_getattr,
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.removexattr	= generic_removexattr,
	.listxattr	= zpl_xattr_list,
};
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>
ebe7e575	28	#include <sys/zfs_znode.h>
ee154f01 BB	29	#include <sys/vfs.h>
	30	#include <sys/zpl.h>
	31
	32
	33	static struct dentry *
	34	zpl_lookup(struct inode dir, struct dentry dentry, struct nameidata *nd)
	35	{
81e97e21	36	cred_t *cr = CRED();
ee154f01	37	struct inode *ip;
ee154f01 BB	38	int error;
ee154f01 BB	39
81e97e21	40	crhold(cr);
ee154f01 BB	41	error = -zfs_lookup(dir, dname(dentry), &ip, 0, cr, NULL, NULL);
ee154f01 BB	42	ASSERT3S(error, <=, 0);
81e97e21	43	crfree(cr);
ee154f01 BB	44
	45	if (error) {
	46	if (error == -ENOENT)
	47	return d_splice_alias(NULL, dentry);
	48	else
	49	return ERR_PTR(error);
	50	}
	51
	52	return d_splice_alias(ip, dentry);
	53	}
	54
ebe7e575	55	void
9fd91dae	56	zpl_vap_init(vattr_t vap, struct inode dir, struct dentry *dentry,
b39d3b9f	57	zpl_umode_t mode, cred_t *cr)
9fd91dae BB	58	{
	59	vap->va_mask = ATTR_MODE;
	60	vap->va_mode = mode;
	61	vap->va_dentry = dentry;
	62	vap->va_uid = crgetfsuid(cr);
	63
	64	if (dir && dir->i_mode & S_ISGID) {
	65	vap->va_gid = dir->i_gid;
	66	if (S_ISDIR(mode))
	67	vap->va_mode \|= S_ISGID;
	68	} else {
	69	vap->va_gid = crgetfsgid(cr);
	70	}
	71	}
	72
ee154f01	73	static int
b39d3b9f	74	zpl_create(struct inode dir, struct dentry dentry, zpl_umode_t mode,
ee154f01 BB	75	struct nameidata *nd)
ee154f01 BB	76	{
81e97e21	77	cred_t *cr = CRED();
ee154f01 BB	78	struct inode *ip;
	79	vattr_t *vap;
	80	int error;
	81
81e97e21	82	crhold(cr);
ee154f01	83	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
9fd91dae	84	zpl_vap_init(vap, dir, dentry, mode, cr);
ee154f01 BB	85
ee154f01 BB	86	error = -zfs_create(dir, (char *)dentry->d_name.name,
81e97e21	87	vap, 0, mode, &ip, cr, 0, NULL);
ee154f01	88	kmem_free(vap, sizeof(vattr_t));
81e97e21	89	crfree(cr);
ee154f01 BB	90	ASSERT3S(error, <=, 0);
	91
	92	return (error);
	93	}
	94
	95	static int
b39d3b9f BB	96	zpl_mknod(struct inode dir, struct dentry dentry, zpl_umode_t mode,
b39d3b9f BB	97	dev_t rdev)
ee154f01	98	{
81e97e21	99	cred_t *cr = CRED();
ee154f01 BB	100	struct inode *ip;
	101	vattr_t *vap;
	102	int error;
	103
aa6d8c10 NB	104	/*
	105	* We currently expect Linux to supply rdev=0 for all sockets
	106	* and fifos, but we want to know if this behavior ever changes.
	107	*/
	108	if (S_ISSOCK(mode) \|\| S_ISFIFO(mode))
	109	ASSERT(rdev == 0);
	110
81e97e21	111	crhold(cr);
ee154f01	112	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
9fd91dae	113	zpl_vap_init(vap, dir, dentry, mode, cr);
ee154f01	114	vap->va_rdev = rdev;
ee154f01 BB	115
ee154f01 BB	116	error = -zfs_create(dir, (char *)dentry->d_name.name,
81e97e21	117	vap, 0, mode, &ip, cr, 0, NULL);
ee154f01	118	kmem_free(vap, sizeof(vattr_t));
81e97e21	119	crfree(cr);
ee154f01 BB	120	ASSERT3S(error, <=, 0);
	121
	122	return (-error);
	123	}
	124
	125	static int
	126	zpl_unlink(struct inode dir, struct dentry dentry)
	127	{
81e97e21	128	cred_t *cr = CRED();
ee154f01 BB	129	int error;
ee154f01 BB	130
81e97e21	131	crhold(cr);
ee154f01	132	error = -zfs_remove(dir, dname(dentry), cr);
81e97e21	133	crfree(cr);
ee154f01 BB	134	ASSERT3S(error, <=, 0);
	135
	136	return (error);
	137	}
	138
	139	static int
b39d3b9f	140	zpl_mkdir(struct inode dir, struct dentry dentry, zpl_umode_t mode)
ee154f01	141	{
81e97e21	142	cred_t *cr = CRED();
ee154f01 BB	143	vattr_t *vap;
	144	struct inode *ip;
	145	int error;
	146
81e97e21	147	crhold(cr);
ee154f01	148	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
9fd91dae	149	zpl_vap_init(vap, dir, dentry, mode \| S_IFDIR, cr);
ee154f01 BB	150
ee154f01 BB	151	error = -zfs_mkdir(dir, dname(dentry), vap, &ip, cr, 0, NULL);
ee154f01	152	kmem_free(vap, sizeof(vattr_t));
81e97e21	153	crfree(cr);
ee154f01 BB	154	ASSERT3S(error, <=, 0);
	155
	156	return (error);
	157	}
	158
	159	static int
	160	zpl_rmdir(struct inode * dir, struct dentry *dentry)
	161	{
81e97e21	162	cred_t *cr = CRED();
ee154f01 BB	163	int error;
ee154f01 BB	164
81e97e21	165	crhold(cr);
ee154f01	166	error = -zfs_rmdir(dir, dname(dentry), NULL, cr, 0);
81e97e21	167	crfree(cr);
ee154f01 BB	168	ASSERT3S(error, <=, 0);
	169
	170	return (error);
	171	}
	172
	173	static int
	174	zpl_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
	175	{
ebe7e575	176	boolean_t issnap = ITOZSB(dentry->d_inode)->z_issnap;
ee154f01 BB	177	int error;
ee154f01 BB	178
ebe7e575 BB	179	/*
	180	* Ensure MNT_SHRINKABLE is set on snapshots to ensure they are
	181	* unmounted automatically with the parent file system. This
	182	* is done on the first getattr because it's not easy to get the
	183	* vfsmount structure at mount time. This call path is explicitly
	184	* marked unlikely to avoid any performance impact. FWIW, ext4
	185	* resorts to a similar trick for sysadmin convenience.
	186	*/
	187	if (unlikely(issnap && !(mnt->mnt_flags & MNT_SHRINKABLE)))
	188	mnt->mnt_flags \|= MNT_SHRINKABLE;
	189
057e8eee	190	error = -zfs_getattr_fast(dentry->d_inode, stat);
ee154f01 BB	191	ASSERT3S(error, <=, 0);
	192
	193	return (error);
	194	}
	195
	196	static int
5484965a	197	zpl_setattr(struct dentry dentry, struct iattr ia)
ee154f01	198	{
81e97e21	199	cred_t *cr = CRED();
5484965a	200	vattr_t *vap;
ee154f01 BB	201	int error;
ee154f01 BB	202
5484965a	203	error = inode_change_ok(dentry->d_inode, ia);
ee154f01 BB	204	if (error)
	205	return (error);
	206
81e97e21	207	crhold(cr);
5484965a BB	208	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
	209	vap->va_mask = ia->ia_valid & ATTR_IATTR_MASK;
	210	vap->va_mode = ia->ia_mode;
	211	vap->va_uid = ia->ia_uid;
	212	vap->va_gid = ia->ia_gid;
	213	vap->va_size = ia->ia_size;
	214	vap->va_atime = ia->ia_atime;
	215	vap->va_mtime = ia->ia_mtime;
	216	vap->va_ctime = ia->ia_ctime;
	217
	218	error = -zfs_setattr(dentry->d_inode, vap, 0, cr);
	219
	220	kmem_free(vap, sizeof(vattr_t));
81e97e21	221	crfree(cr);
ee154f01 BB	222	ASSERT3S(error, <=, 0);
ee154f01 BB	223
5484965a	224	return (error);
ee154f01 BB	225	}
	226
	227	static int
	228	zpl_rename(struct inode sdip, struct dentry sdentry,
	229	struct inode tdip, struct dentry tdentry)
	230	{
81e97e21	231	cred_t *cr = CRED();
ee154f01 BB	232	int error;
ee154f01 BB	233
81e97e21	234	crhold(cr);
ee154f01	235	error = -zfs_rename(sdip, dname(sdentry), tdip, dname(tdentry), cr, 0);
81e97e21	236	crfree(cr);
ee154f01 BB	237	ASSERT3S(error, <=, 0);
	238
	239	return (error);
	240	}
	241
	242	static int
	243	zpl_symlink(struct inode dir, struct dentry dentry, const char *name)
	244	{
81e97e21	245	cred_t *cr = CRED();
ee154f01 BB	246	vattr_t *vap;
	247	struct inode *ip;
	248	int error;
	249
81e97e21	250	crhold(cr);
ee154f01	251	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
9fd91dae	252	zpl_vap_init(vap, dir, dentry, S_IFLNK \| S_IRWXUGO, cr);
ee154f01 BB	253
ee154f01 BB	254	error = -zfs_symlink(dir, dname(dentry), vap, (char *)name, &ip, cr, 0);
ee154f01	255	kmem_free(vap, sizeof(vattr_t));
81e97e21	256	crfree(cr);
ee154f01 BB	257	ASSERT3S(error, <=, 0);
	258
	259	return (error);
	260	}
	261
	262	static void *
	263	zpl_follow_link(struct dentry dentry, struct nameidata nd)
	264	{
81e97e21	265	cred_t *cr = CRED();
8b4f9a2d BB	266	struct inode *ip = dentry->d_inode;
	267	struct iovec iov;
	268	uio_t uio;
	269	char *link;
8b4f9a2d BB	270	int error;
8b4f9a2d BB	271
81e97e21	272	crhold(cr);
8b4f9a2d BB	273
	274	iov.iov_len = MAXPATHLEN;
	275	iov.iov_base = link = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
	276
	277	uio.uio_iov = &iov;
	278	uio.uio_iovcnt = 1;
	279	uio.uio_resid = (MAXPATHLEN - 1);
	280	uio.uio_segflg = UIO_SYSSPACE;
	281
50950001	282	error = -zfs_readlink(ip, &uio, cr);
8b4f9a2d BB	283	if (error) {
	284	kmem_free(link, MAXPATHLEN);
	285	nd_set_link(nd, ERR_PTR(error));
	286	} else {
	287	nd_set_link(nd, link);
	288	}
	289
81e97e21	290	crfree(cr);
8b4f9a2d	291	return (NULL);
ee154f01 BB	292	}
	293
	294	static void
	295	zpl_put_link(struct dentry dentry, struct nameidata nd, void *ptr)
	296	{
	297	char *link;
	298
	299	link = nd_get_link(nd);
	300	if (!IS_ERR(link))
8b4f9a2d	301	kmem_free(link, MAXPATHLEN);
ee154f01 BB	302	}
	303
	304	static int
	305	zpl_link(struct dentry old_dentry, struct inode dir, struct dentry *dentry)
	306	{
81e97e21	307	cred_t *cr = CRED();
ee154f01	308	struct inode *ip = old_dentry->d_inode;
ee154f01 BB	309	int error;
	310
	311	if (ip->i_nlink >= ZFS_LINK_MAX)
	312	return -EMLINK;
	313
81e97e21	314	crhold(cr);
ee154f01 BB	315	ip->i_ctime = CURRENT_TIME_SEC;
	316	igrab(ip); /* Use ihold() if available */
	317
	318	error = -zfs_link(dir, ip, dname(dentry), cr);
	319	if (error) {
	320	iput(ip);
	321	goto out;
	322	}
	323
	324	d_instantiate(dentry, ip);
	325	out:
81e97e21	326	crfree(cr);
ee154f01 BB	327	ASSERT3S(error, <=, 0);
	328
	329	return (error);
	330	}
	331
5cb63a57 ED	332	static void
	333	zpl_truncate_range(struct inode* ip, loff_t start, loff_t end)
	334	{
	335	cred_t *cr = CRED();
	336	flock64_t bf;
	337
	338	ASSERT3S(start, <=, end);
	339
	340	/*
	341	* zfs_freesp() will interpret (len == 0) as meaning "truncate until
	342	* the end of the file". We don't want that.
	343	*/
	344	if (start == end)
	345	return;
	346
	347	crhold(cr);
	348
	349	bf.l_type = F_WRLCK;
	350	bf.l_whence = 0;
	351	bf.l_start = start;
	352	bf.l_len = end - start;
	353	bf.l_pid = 0;
	354	zfs_space(ip, F_FREESP, &bf, FWRITE, start, cr);
	355
	356	crfree(cr);
	357	}
	358
cb2d1901 ED	359	#ifdef HAVE_INODE_FALLOCATE
	360	static long
	361	zpl_fallocate(struct inode *ip, int mode, loff_t offset, loff_t len)
	362	{
	363	return zpl_fallocate_common(ip, mode, offset, len);
	364	}
	365	#endif /* HAVE_INODE_FALLOCATE */
	366
	367
ee154f01	368	const struct inode_operations zpl_inode_operations = {
ee154f01 BB	369	.create = zpl_create,
	370	.link = zpl_link,
	371	.unlink = zpl_unlink,
	372	.symlink = zpl_symlink,
	373	.mkdir = zpl_mkdir,
	374	.rmdir = zpl_rmdir,
	375	.mknod = zpl_mknod,
	376	.rename = zpl_rename,
	377	.setattr = zpl_setattr,
	378	.getattr = zpl_getattr,
	379	.setxattr = generic_setxattr,
	380	.getxattr = generic_getxattr,
	381	.removexattr = generic_removexattr,
	382	.listxattr = zpl_xattr_list,
5cb63a57	383	.truncate_range = zpl_truncate_range,
cb2d1901 ED	384	#ifdef HAVE_INODE_FALLOCATE
	385	.fallocate = zpl_fallocate,
	386	#endif /* HAVE_INODE_FALLOCATE */
ee154f01 BB	387	};
	388
	389	const struct inode_operations zpl_dir_inode_operations = {
ee154f01 BB	390	.create = zpl_create,
	391	.lookup = zpl_lookup,
	392	.link = zpl_link,
	393	.unlink = zpl_unlink,
	394	.symlink = zpl_symlink,
	395	.mkdir = zpl_mkdir,
	396	.rmdir = zpl_rmdir,
	397	.mknod = zpl_mknod,
	398	.rename = zpl_rename,
	399	.setattr = zpl_setattr,
a6695d83 BB	400	.getattr = zpl_getattr,
	401	.setxattr = generic_setxattr,
	402	.getxattr = generic_getxattr,
	403	.removexattr = generic_removexattr,
	404	.listxattr = zpl_xattr_list,
ee154f01 BB	405	};
	406
	407	const struct inode_operations zpl_symlink_inode_operations = {
ee154f01 BB	408	.readlink = generic_readlink,
	409	.follow_link = zpl_follow_link,
	410	.put_link = zpl_put_link,
6f2255ba BB	411	.setattr = zpl_setattr,
6f2255ba BB	412	.getattr = zpl_getattr,
f31b3ebe BB	413	.setxattr = generic_setxattr,
	414	.getxattr = generic_getxattr,
	415	.removexattr = generic_removexattr,
	416	.listxattr = zpl_xattr_list,
ee154f01 BB	417	};
	418
	419	const struct inode_operations zpl_special_inode_operations = {
a6695d83 BB	420	.setattr = zpl_setattr,
	421	.getattr = zpl_getattr,
	422	.setxattr = generic_setxattr,
	423	.getxattr = generic_getxattr,
	424	.removexattr = generic_removexattr,
	425	.listxattr = zpl_xattr_list,
ee154f01	426	};