[mirror_zfs.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 *
#ifdef HAVE_LOOKUP_NAMEIDATA
zpl_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
#else
zpl_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
#endif
{
	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
#ifdef HAVE_CREATE_NAMEIDATA
zpl_create(struct inode *dir, struct dentry *dentry, zpl_umode_t mode,
    struct nameidata *nd)
#else
zpl_create(struct inode *dir, struct dentry *dentry, zpl_umode_t mode,
    bool flag)
#endif
{
	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, dname(dentry), vap, 0, mode, &ip, cr, 0, NULL);
	if (error == 0) {
		error = zpl_xattr_security_init(ip, dir, &dentry->d_name);
		VERIFY3S(error, ==, 0);
	}

	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)
{
	const char *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);
}

#ifdef HAVE_INODE_TRUNCATE_RANGE
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);
}
#endif /* HAVE_INODE_TRUNCATE_RANGE */

#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,
#ifdef HAVE_INODE_TRUNCATE_RANGE
	.truncate_range = zpl_truncate_range,
#endif /* HAVE_INODE_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 *
8f195a90	34	#ifdef HAVE_LOOKUP_NAMEIDATA
ee154f01	35	zpl_lookup(struct inode dir, struct dentry dentry, struct nameidata *nd)
8f195a90 YS	36	#else
	37	zpl_lookup(struct inode dir, struct dentry dentry, unsigned int flags)
	38	#endif
ee154f01	39	{
81e97e21	40	cred_t *cr = CRED();
ee154f01	41	struct inode *ip;
ee154f01 BB	42	int error;
ee154f01 BB	43
81e97e21	44	crhold(cr);
ee154f01 BB	45	error = -zfs_lookup(dir, dname(dentry), &ip, 0, cr, NULL, NULL);
ee154f01 BB	46	ASSERT3S(error, <=, 0);
81e97e21	47	crfree(cr);
ee154f01 BB	48
	49	if (error) {
	50	if (error == -ENOENT)
	51	return d_splice_alias(NULL, dentry);
	52	else
	53	return ERR_PTR(error);
	54	}
	55
	56	return d_splice_alias(ip, dentry);
	57	}
	58
ebe7e575	59	void
9fd91dae	60	zpl_vap_init(vattr_t vap, struct inode dir, struct dentry *dentry,
b39d3b9f	61	zpl_umode_t mode, cred_t *cr)
9fd91dae BB	62	{
	63	vap->va_mask = ATTR_MODE;
	64	vap->va_mode = mode;
	65	vap->va_dentry = dentry;
	66	vap->va_uid = crgetfsuid(cr);
	67
	68	if (dir && dir->i_mode & S_ISGID) {
	69	vap->va_gid = dir->i_gid;
	70	if (S_ISDIR(mode))
	71	vap->va_mode \|= S_ISGID;
	72	} else {
	73	vap->va_gid = crgetfsgid(cr);
	74	}
	75	}
	76
ee154f01	77	static int
558ef6d0	78	#ifdef HAVE_CREATE_NAMEIDATA
b39d3b9f	79	zpl_create(struct inode dir, struct dentry dentry, zpl_umode_t mode,
ee154f01	80	struct nameidata *nd)
558ef6d0 YS	81	#else
	82	zpl_create(struct inode dir, struct dentry dentry, zpl_umode_t mode,
	83	bool flag)
	84	#endif
ee154f01	85	{
81e97e21	86	cred_t *cr = CRED();
ee154f01 BB	87	struct inode *ip;
	88	vattr_t *vap;
	89	int error;
	90
81e97e21	91	crhold(cr);
ee154f01	92	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
9fd91dae	93	zpl_vap_init(vap, dir, dentry, mode, cr);
ee154f01	94
e89260a1 BB	95	error = -zfs_create(dir, dname(dentry), vap, 0, mode, &ip, cr, 0, NULL);
	96	if (error == 0) {
	97	error = zpl_xattr_security_init(ip, dir, &dentry->d_name);
	98	VERIFY3S(error, ==, 0);
	99	}
	100
ee154f01	101	kmem_free(vap, sizeof(vattr_t));
81e97e21	102	crfree(cr);
ee154f01 BB	103	ASSERT3S(error, <=, 0);
	104
	105	return (error);
	106	}
	107
	108	static int
b39d3b9f BB	109	zpl_mknod(struct inode dir, struct dentry dentry, zpl_umode_t mode,
b39d3b9f BB	110	dev_t rdev)
ee154f01	111	{
81e97e21	112	cred_t *cr = CRED();
ee154f01 BB	113	struct inode *ip;
	114	vattr_t *vap;
	115	int error;
	116
aa6d8c10 NB	117	/*
	118	* We currently expect Linux to supply rdev=0 for all sockets
	119	* and fifos, but we want to know if this behavior ever changes.
	120	*/
	121	if (S_ISSOCK(mode) \|\| S_ISFIFO(mode))
	122	ASSERT(rdev == 0);
	123
81e97e21	124	crhold(cr);
ee154f01	125	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
9fd91dae	126	zpl_vap_init(vap, dir, dentry, mode, cr);
ee154f01	127	vap->va_rdev = rdev;
ee154f01 BB	128
ee154f01 BB	129	error = -zfs_create(dir, (char *)dentry->d_name.name,
81e97e21	130	vap, 0, mode, &ip, cr, 0, NULL);
ee154f01	131	kmem_free(vap, sizeof(vattr_t));
81e97e21	132	crfree(cr);
ee154f01 BB	133	ASSERT3S(error, <=, 0);
	134
	135	return (-error);
	136	}
	137
	138	static int
	139	zpl_unlink(struct inode dir, struct dentry dentry)
	140	{
81e97e21	141	cred_t *cr = CRED();
ee154f01 BB	142	int error;
ee154f01 BB	143
81e97e21	144	crhold(cr);
ee154f01	145	error = -zfs_remove(dir, dname(dentry), cr);
81e97e21	146	crfree(cr);
ee154f01 BB	147	ASSERT3S(error, <=, 0);
	148
	149	return (error);
	150	}
	151
	152	static int
b39d3b9f	153	zpl_mkdir(struct inode dir, struct dentry dentry, zpl_umode_t mode)
ee154f01	154	{
81e97e21	155	cred_t *cr = CRED();
ee154f01 BB	156	vattr_t *vap;
	157	struct inode *ip;
	158	int error;
	159
81e97e21	160	crhold(cr);
ee154f01	161	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
9fd91dae	162	zpl_vap_init(vap, dir, dentry, mode \| S_IFDIR, cr);
ee154f01 BB	163
ee154f01 BB	164	error = -zfs_mkdir(dir, dname(dentry), vap, &ip, cr, 0, NULL);
ee154f01	165	kmem_free(vap, sizeof(vattr_t));
81e97e21	166	crfree(cr);
ee154f01 BB	167	ASSERT3S(error, <=, 0);
	168
	169	return (error);
	170	}
	171
	172	static int
	173	zpl_rmdir(struct inode * dir, struct dentry *dentry)
	174	{
81e97e21	175	cred_t *cr = CRED();
ee154f01 BB	176	int error;
ee154f01 BB	177
81e97e21	178	crhold(cr);
ee154f01	179	error = -zfs_rmdir(dir, dname(dentry), NULL, cr, 0);
81e97e21	180	crfree(cr);
ee154f01 BB	181	ASSERT3S(error, <=, 0);
	182
	183	return (error);
	184	}
	185
	186	static int
	187	zpl_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
	188	{
ebe7e575	189	boolean_t issnap = ITOZSB(dentry->d_inode)->z_issnap;
ee154f01 BB	190	int error;
ee154f01 BB	191
ebe7e575 BB	192	/*
	193	* Ensure MNT_SHRINKABLE is set on snapshots to ensure they are
	194	* unmounted automatically with the parent file system. This
	195	* is done on the first getattr because it's not easy to get the
	196	* vfsmount structure at mount time. This call path is explicitly
	197	* marked unlikely to avoid any performance impact. FWIW, ext4
	198	* resorts to a similar trick for sysadmin convenience.
	199	*/
	200	if (unlikely(issnap && !(mnt->mnt_flags & MNT_SHRINKABLE)))
	201	mnt->mnt_flags \|= MNT_SHRINKABLE;
	202
057e8eee	203	error = -zfs_getattr_fast(dentry->d_inode, stat);
ee154f01 BB	204	ASSERT3S(error, <=, 0);
	205
	206	return (error);
	207	}
	208
	209	static int
5484965a	210	zpl_setattr(struct dentry dentry, struct iattr ia)
ee154f01	211	{
81e97e21	212	cred_t *cr = CRED();
5484965a	213	vattr_t *vap;
ee154f01 BB	214	int error;
ee154f01 BB	215
5484965a	216	error = inode_change_ok(dentry->d_inode, ia);
ee154f01 BB	217	if (error)
	218	return (error);
	219
81e97e21	220	crhold(cr);
5484965a BB	221	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
	222	vap->va_mask = ia->ia_valid & ATTR_IATTR_MASK;
	223	vap->va_mode = ia->ia_mode;
	224	vap->va_uid = ia->ia_uid;
	225	vap->va_gid = ia->ia_gid;
	226	vap->va_size = ia->ia_size;
	227	vap->va_atime = ia->ia_atime;
	228	vap->va_mtime = ia->ia_mtime;
	229	vap->va_ctime = ia->ia_ctime;
	230
	231	error = -zfs_setattr(dentry->d_inode, vap, 0, cr);
	232
	233	kmem_free(vap, sizeof(vattr_t));
81e97e21	234	crfree(cr);
ee154f01 BB	235	ASSERT3S(error, <=, 0);
ee154f01 BB	236
5484965a	237	return (error);
ee154f01 BB	238	}
	239
	240	static int
	241	zpl_rename(struct inode sdip, struct dentry sdentry,
	242	struct inode tdip, struct dentry tdentry)
	243	{
81e97e21	244	cred_t *cr = CRED();
ee154f01 BB	245	int error;
ee154f01 BB	246
81e97e21	247	crhold(cr);
ee154f01	248	error = -zfs_rename(sdip, dname(sdentry), tdip, dname(tdentry), cr, 0);
81e97e21	249	crfree(cr);
ee154f01 BB	250	ASSERT3S(error, <=, 0);
	251
	252	return (error);
	253	}
	254
	255	static int
	256	zpl_symlink(struct inode dir, struct dentry dentry, const char *name)
	257	{
81e97e21	258	cred_t *cr = CRED();
ee154f01 BB	259	vattr_t *vap;
	260	struct inode *ip;
	261	int error;
	262
81e97e21	263	crhold(cr);
ee154f01	264	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
9fd91dae	265	zpl_vap_init(vap, dir, dentry, S_IFLNK \| S_IRWXUGO, cr);
ee154f01 BB	266
ee154f01 BB	267	error = -zfs_symlink(dir, dname(dentry), vap, (char *)name, &ip, cr, 0);
ee154f01	268	kmem_free(vap, sizeof(vattr_t));
81e97e21	269	crfree(cr);
ee154f01 BB	270	ASSERT3S(error, <=, 0);
	271
	272	return (error);
	273	}
	274
	275	static void *
	276	zpl_follow_link(struct dentry dentry, struct nameidata nd)
	277	{
81e97e21	278	cred_t *cr = CRED();
8b4f9a2d BB	279	struct inode *ip = dentry->d_inode;
	280	struct iovec iov;
	281	uio_t uio;
	282	char *link;
8b4f9a2d BB	283	int error;
8b4f9a2d BB	284
81e97e21	285	crhold(cr);
8b4f9a2d BB	286
	287	iov.iov_len = MAXPATHLEN;
	288	iov.iov_base = link = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
	289
	290	uio.uio_iov = &iov;
	291	uio.uio_iovcnt = 1;
	292	uio.uio_resid = (MAXPATHLEN - 1);
	293	uio.uio_segflg = UIO_SYSSPACE;
	294
50950001	295	error = -zfs_readlink(ip, &uio, cr);
8b4f9a2d BB	296	if (error) {
	297	kmem_free(link, MAXPATHLEN);
	298	nd_set_link(nd, ERR_PTR(error));
	299	} else {
	300	nd_set_link(nd, link);
	301	}
	302
81e97e21	303	crfree(cr);
8b4f9a2d	304	return (NULL);
ee154f01 BB	305	}
	306
	307	static void
	308	zpl_put_link(struct dentry dentry, struct nameidata nd, void *ptr)
	309	{
0a6b03d3	310	const char *link = nd_get_link(nd);
ee154f01	311
ee154f01	312	if (!IS_ERR(link))
8b4f9a2d	313	kmem_free(link, MAXPATHLEN);
ee154f01 BB	314	}
	315
	316	static int
	317	zpl_link(struct dentry old_dentry, struct inode dir, struct dentry *dentry)
	318	{
81e97e21	319	cred_t *cr = CRED();
ee154f01	320	struct inode *ip = old_dentry->d_inode;
ee154f01 BB	321	int error;
	322
	323	if (ip->i_nlink >= ZFS_LINK_MAX)
	324	return -EMLINK;
	325
81e97e21	326	crhold(cr);
ee154f01 BB	327	ip->i_ctime = CURRENT_TIME_SEC;
	328	igrab(ip); /* Use ihold() if available */
	329
	330	error = -zfs_link(dir, ip, dname(dentry), cr);
	331	if (error) {
	332	iput(ip);
	333	goto out;
	334	}
	335
	336	d_instantiate(dentry, ip);
	337	out:
81e97e21	338	crfree(cr);
ee154f01 BB	339	ASSERT3S(error, <=, 0);
	340
	341	return (error);
	342	}
	343
ea1fdf46	344	#ifdef HAVE_INODE_TRUNCATE_RANGE
5cb63a57 ED	345	static void
	346	zpl_truncate_range(struct inode* ip, loff_t start, loff_t end)
	347	{
	348	cred_t *cr = CRED();
	349	flock64_t bf;
	350
	351	ASSERT3S(start, <=, end);
	352
	353	/*
	354	* zfs_freesp() will interpret (len == 0) as meaning "truncate until
	355	* the end of the file". We don't want that.
	356	*/
	357	if (start == end)
	358	return;
	359
	360	crhold(cr);
	361
	362	bf.l_type = F_WRLCK;
	363	bf.l_whence = 0;
	364	bf.l_start = start;
	365	bf.l_len = end - start;
	366	bf.l_pid = 0;
	367	zfs_space(ip, F_FREESP, &bf, FWRITE, start, cr);
	368
	369	crfree(cr);
	370	}
ea1fdf46	371	#endif /* HAVE_INODE_TRUNCATE_RANGE */
5cb63a57	372
cb2d1901 ED	373	#ifdef HAVE_INODE_FALLOCATE
	374	static long
	375	zpl_fallocate(struct inode *ip, int mode, loff_t offset, loff_t len)
	376	{
	377	return zpl_fallocate_common(ip, mode, offset, len);
	378	}
	379	#endif /* HAVE_INODE_FALLOCATE */
	380
	381
ee154f01	382	const struct inode_operations zpl_inode_operations = {
ee154f01 BB	383	.create = zpl_create,
	384	.link = zpl_link,
	385	.unlink = zpl_unlink,
	386	.symlink = zpl_symlink,
	387	.mkdir = zpl_mkdir,
	388	.rmdir = zpl_rmdir,
	389	.mknod = zpl_mknod,
	390	.rename = zpl_rename,
	391	.setattr = zpl_setattr,
	392	.getattr = zpl_getattr,
	393	.setxattr = generic_setxattr,
	394	.getxattr = generic_getxattr,
	395	.removexattr = generic_removexattr,
	396	.listxattr = zpl_xattr_list,
ea1fdf46	397	#ifdef HAVE_INODE_TRUNCATE_RANGE
5cb63a57	398	.truncate_range = zpl_truncate_range,
ea1fdf46	399	#endif /* HAVE_INODE_TRUNCATE_RANGE */
cb2d1901 ED	400	#ifdef HAVE_INODE_FALLOCATE
	401	.fallocate = zpl_fallocate,
	402	#endif /* HAVE_INODE_FALLOCATE */
ee154f01 BB	403	};
	404
	405	const struct inode_operations zpl_dir_inode_operations = {
ee154f01 BB	406	.create = zpl_create,
	407	.lookup = zpl_lookup,
	408	.link = zpl_link,
	409	.unlink = zpl_unlink,
	410	.symlink = zpl_symlink,
	411	.mkdir = zpl_mkdir,
	412	.rmdir = zpl_rmdir,
	413	.mknod = zpl_mknod,
	414	.rename = zpl_rename,
	415	.setattr = zpl_setattr,
a6695d83 BB	416	.getattr = zpl_getattr,
	417	.setxattr = generic_setxattr,
	418	.getxattr = generic_getxattr,
	419	.removexattr = generic_removexattr,
	420	.listxattr = zpl_xattr_list,
ee154f01 BB	421	};
	422
	423	const struct inode_operations zpl_symlink_inode_operations = {
ee154f01 BB	424	.readlink = generic_readlink,
	425	.follow_link = zpl_follow_link,
	426	.put_link = zpl_put_link,
6f2255ba BB	427	.setattr = zpl_setattr,
6f2255ba BB	428	.getattr = zpl_getattr,
f31b3ebe BB	429	.setxattr = generic_setxattr,
	430	.getxattr = generic_getxattr,
	431	.removexattr = generic_removexattr,
	432	.listxattr = zpl_xattr_list,
ee154f01 BB	433	};
	434
	435	const struct inode_operations zpl_special_inode_operations = {
a6695d83 BB	436	.setattr = zpl_setattr,
	437	.getattr = zpl_getattr,
	438	.setxattr = generic_setxattr,
	439	.getxattr = generic_getxattr,
	440	.removexattr = generic_removexattr,
	441	.listxattr = zpl_xattr_list,
ee154f01	442	};