[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 *
#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);

	spin_lock(&dentry->d_lock);
	dentry->d_time = jiffies;
	spin_unlock(&dentry->d_lock);

	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, zpl_umode_t mode, cred_t *cr)
{
	vap->va_mask = ATTR_MODE;
	vap->va_mode = mode;
	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, 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);
		d_instantiate(dentry, ip);
		d_set_d_op(dentry, &zpl_dentry_operations);
	}

	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, mode, cr);
	vap->va_rdev = rdev;

	error = -zfs_create(dir, dname(dentry), vap, 0, mode, &ip, cr, 0, NULL);
	if (error == 0) {
		d_instantiate(dentry, ip);
		d_set_d_op(dentry, &zpl_dentry_operations);
	}

	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, mode | S_IFDIR, cr);

	error = -zfs_mkdir(dir, dname(dentry), vap, &ip, cr, 0, NULL);
	if (error == 0) {
		d_instantiate(dentry, ip);
		d_set_d_op(dentry, &zpl_dentry_operations);
	}

	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, S_IFLNK | S_IRWXUGO, cr);

	error = -zfs_symlink(dir, dname(dentry), vap, (char *)name, &ip, cr, 0);
	if (error == 0) {
		d_instantiate(dentry, ip);
		d_set_d_op(dentry, &zpl_dentry_operations);
	}

	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);
	d_set_d_op(dentry, &zpl_dentry_operations);
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 */

static int
#ifdef HAVE_D_REVALIDATE_NAMEIDATA
zpl_revalidate(struct dentry *dentry, struct nameidata *nd)
{
	unsigned int flags = nd->flags;
#else
zpl_revalidate(struct dentry *dentry, unsigned int flags)
{
#endif /* HAVE_D_REVALIDATE_NAMEIDATA */
	zfs_sb_t *zsb = dentry->d_sb->s_fs_info;
	int error;

	if (flags & LOOKUP_RCU)
		return (-ECHILD);

	/*
	 * After a rollback negative dentries created before the rollback
	 * time must be invalidated.  Otherwise they can obscure files which
	 * are only present in the rolled back dataset.
	 */
	if (dentry->d_inode == NULL) {
		spin_lock(&dentry->d_lock);
		error = time_before(dentry->d_time, zsb->z_rollback_time);
		spin_unlock(&dentry->d_lock);

		if (error)
			return (0);
	}

	/*
	 * The dentry may reference a stale inode if a mounted file system
	 * was rolled back to a point in time where the object didn't exist.
	 */
	if (dentry->d_inode && ITOZ(dentry->d_inode)->z_is_stale)
		return (0);

	return (1);
}

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,
};

dentry_operations_t zpl_dentry_operations = {
	.d_revalidate	= zpl_revalidate,
};
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	48
7b3e34ba BB	49	spin_lock(&dentry->d_lock);
	50	dentry->d_time = jiffies;
	51	spin_unlock(&dentry->d_lock);
	52
ee154f01 BB	53	if (error) {
	54	if (error == -ENOENT)
	55	return d_splice_alias(NULL, dentry);
	56	else
	57	return ERR_PTR(error);
	58	}
	59
	60	return d_splice_alias(ip, dentry);
	61	}
	62
ebe7e575	63	void
7b3e34ba	64	zpl_vap_init(vattr_t vap, struct inode dir, zpl_umode_t mode, cred_t *cr)
9fd91dae BB	65	{
	66	vap->va_mask = ATTR_MODE;
	67	vap->va_mode = mode;
9fd91dae BB	68	vap->va_uid = crgetfsuid(cr);
	69
	70	if (dir && dir->i_mode & S_ISGID) {
	71	vap->va_gid = dir->i_gid;
	72	if (S_ISDIR(mode))
	73	vap->va_mode \|= S_ISGID;
	74	} else {
	75	vap->va_gid = crgetfsgid(cr);
	76	}
	77	}
	78
ee154f01	79	static int
558ef6d0	80	#ifdef HAVE_CREATE_NAMEIDATA
b39d3b9f	81	zpl_create(struct inode dir, struct dentry dentry, zpl_umode_t mode,
ee154f01	82	struct nameidata *nd)
558ef6d0 YS	83	#else
	84	zpl_create(struct inode dir, struct dentry dentry, zpl_umode_t mode,
	85	bool flag)
	86	#endif
ee154f01	87	{
81e97e21	88	cred_t *cr = CRED();
ee154f01 BB	89	struct inode *ip;
	90	vattr_t *vap;
	91	int error;
	92
81e97e21	93	crhold(cr);
ee154f01	94	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
7b3e34ba	95	zpl_vap_init(vap, dir, mode, cr);
ee154f01	96
e89260a1 BB	97	error = -zfs_create(dir, dname(dentry), vap, 0, mode, &ip, cr, 0, NULL);
	98	if (error == 0) {
	99	error = zpl_xattr_security_init(ip, dir, &dentry->d_name);
	100	VERIFY3S(error, ==, 0);
7b3e34ba BB	101	d_instantiate(dentry, ip);
7b3e34ba BB	102	d_set_d_op(dentry, &zpl_dentry_operations);
e89260a1 BB	103	}
e89260a1 BB	104
ee154f01	105	kmem_free(vap, sizeof(vattr_t));
81e97e21	106	crfree(cr);
ee154f01 BB	107	ASSERT3S(error, <=, 0);
	108
	109	return (error);
	110	}
	111
	112	static int
b39d3b9f BB	113	zpl_mknod(struct inode dir, struct dentry dentry, zpl_umode_t mode,
b39d3b9f BB	114	dev_t rdev)
ee154f01	115	{
81e97e21	116	cred_t *cr = CRED();
ee154f01 BB	117	struct inode *ip;
	118	vattr_t *vap;
	119	int error;
	120
aa6d8c10 NB	121	/*
	122	* We currently expect Linux to supply rdev=0 for all sockets
	123	* and fifos, but we want to know if this behavior ever changes.
	124	*/
	125	if (S_ISSOCK(mode) \|\| S_ISFIFO(mode))
	126	ASSERT(rdev == 0);
	127
81e97e21	128	crhold(cr);
ee154f01	129	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
7b3e34ba	130	zpl_vap_init(vap, dir, mode, cr);
ee154f01	131	vap->va_rdev = rdev;
ee154f01	132
7b3e34ba BB	133	error = -zfs_create(dir, dname(dentry), vap, 0, mode, &ip, cr, 0, NULL);
	134	if (error == 0) {
	135	d_instantiate(dentry, ip);
	136	d_set_d_op(dentry, &zpl_dentry_operations);
	137	}
	138
ee154f01	139	kmem_free(vap, sizeof(vattr_t));
81e97e21	140	crfree(cr);
ee154f01 BB	141	ASSERT3S(error, <=, 0);
	142
	143	return (-error);
	144	}
	145
	146	static int
	147	zpl_unlink(struct inode dir, struct dentry dentry)
	148	{
81e97e21	149	cred_t *cr = CRED();
ee154f01 BB	150	int error;
ee154f01 BB	151
81e97e21	152	crhold(cr);
ee154f01	153	error = -zfs_remove(dir, dname(dentry), cr);
81e97e21	154	crfree(cr);
ee154f01 BB	155	ASSERT3S(error, <=, 0);
	156
	157	return (error);
	158	}
	159
	160	static int
b39d3b9f	161	zpl_mkdir(struct inode dir, struct dentry dentry, zpl_umode_t mode)
ee154f01	162	{
81e97e21	163	cred_t *cr = CRED();
ee154f01 BB	164	vattr_t *vap;
	165	struct inode *ip;
	166	int error;
	167
81e97e21	168	crhold(cr);
ee154f01	169	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
7b3e34ba	170	zpl_vap_init(vap, dir, mode \| S_IFDIR, cr);
ee154f01 BB	171
ee154f01 BB	172	error = -zfs_mkdir(dir, dname(dentry), vap, &ip, cr, 0, NULL);
7b3e34ba BB	173	if (error == 0) {
	174	d_instantiate(dentry, ip);
	175	d_set_d_op(dentry, &zpl_dentry_operations);
	176	}
	177
ee154f01	178	kmem_free(vap, sizeof(vattr_t));
81e97e21	179	crfree(cr);
ee154f01 BB	180	ASSERT3S(error, <=, 0);
	181
	182	return (error);
	183	}
	184
	185	static int
	186	zpl_rmdir(struct inode * dir, struct dentry *dentry)
	187	{
81e97e21	188	cred_t *cr = CRED();
ee154f01 BB	189	int error;
ee154f01 BB	190
81e97e21	191	crhold(cr);
ee154f01	192	error = -zfs_rmdir(dir, dname(dentry), NULL, cr, 0);
81e97e21	193	crfree(cr);
ee154f01 BB	194	ASSERT3S(error, <=, 0);
	195
	196	return (error);
	197	}
	198
	199	static int
	200	zpl_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
	201	{
ebe7e575	202	boolean_t issnap = ITOZSB(dentry->d_inode)->z_issnap;
ee154f01 BB	203	int error;
ee154f01 BB	204
ebe7e575 BB	205	/*
	206	* Ensure MNT_SHRINKABLE is set on snapshots to ensure they are
	207	* unmounted automatically with the parent file system. This
	208	* is done on the first getattr because it's not easy to get the
	209	* vfsmount structure at mount time. This call path is explicitly
	210	* marked unlikely to avoid any performance impact. FWIW, ext4
	211	* resorts to a similar trick for sysadmin convenience.
	212	*/
	213	if (unlikely(issnap && !(mnt->mnt_flags & MNT_SHRINKABLE)))
	214	mnt->mnt_flags \|= MNT_SHRINKABLE;
	215
057e8eee	216	error = -zfs_getattr_fast(dentry->d_inode, stat);
ee154f01 BB	217	ASSERT3S(error, <=, 0);
	218
	219	return (error);
	220	}
	221
	222	static int
5484965a	223	zpl_setattr(struct dentry dentry, struct iattr ia)
ee154f01	224	{
81e97e21	225	cred_t *cr = CRED();
5484965a	226	vattr_t *vap;
ee154f01 BB	227	int error;
ee154f01 BB	228
5484965a	229	error = inode_change_ok(dentry->d_inode, ia);
ee154f01 BB	230	if (error)
	231	return (error);
	232
81e97e21	233	crhold(cr);
5484965a BB	234	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
	235	vap->va_mask = ia->ia_valid & ATTR_IATTR_MASK;
	236	vap->va_mode = ia->ia_mode;
	237	vap->va_uid = ia->ia_uid;
	238	vap->va_gid = ia->ia_gid;
	239	vap->va_size = ia->ia_size;
	240	vap->va_atime = ia->ia_atime;
	241	vap->va_mtime = ia->ia_mtime;
	242	vap->va_ctime = ia->ia_ctime;
	243
	244	error = -zfs_setattr(dentry->d_inode, vap, 0, cr);
	245
	246	kmem_free(vap, sizeof(vattr_t));
81e97e21	247	crfree(cr);
ee154f01 BB	248	ASSERT3S(error, <=, 0);
ee154f01 BB	249
5484965a	250	return (error);
ee154f01 BB	251	}
	252
	253	static int
	254	zpl_rename(struct inode sdip, struct dentry sdentry,
	255	struct inode tdip, struct dentry tdentry)
	256	{
81e97e21	257	cred_t *cr = CRED();
ee154f01 BB	258	int error;
ee154f01 BB	259
81e97e21	260	crhold(cr);
ee154f01	261	error = -zfs_rename(sdip, dname(sdentry), tdip, dname(tdentry), cr, 0);
81e97e21	262	crfree(cr);
ee154f01 BB	263	ASSERT3S(error, <=, 0);
	264
	265	return (error);
	266	}
	267
	268	static int
	269	zpl_symlink(struct inode dir, struct dentry dentry, const char *name)
	270	{
81e97e21	271	cred_t *cr = CRED();
ee154f01 BB	272	vattr_t *vap;
	273	struct inode *ip;
	274	int error;
	275
81e97e21	276	crhold(cr);
ee154f01	277	vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
7b3e34ba	278	zpl_vap_init(vap, dir, S_IFLNK \| S_IRWXUGO, cr);
ee154f01 BB	279
ee154f01 BB	280	error = -zfs_symlink(dir, dname(dentry), vap, (char *)name, &ip, cr, 0);
7b3e34ba BB	281	if (error == 0) {
	282	d_instantiate(dentry, ip);
	283	d_set_d_op(dentry, &zpl_dentry_operations);
	284	}
	285
ee154f01	286	kmem_free(vap, sizeof(vattr_t));
81e97e21	287	crfree(cr);
ee154f01 BB	288	ASSERT3S(error, <=, 0);
	289
	290	return (error);
	291	}
	292
	293	static void *
	294	zpl_follow_link(struct dentry dentry, struct nameidata nd)
	295	{
81e97e21	296	cred_t *cr = CRED();
8b4f9a2d BB	297	struct inode *ip = dentry->d_inode;
	298	struct iovec iov;
	299	uio_t uio;
	300	char *link;
8b4f9a2d BB	301	int error;
8b4f9a2d BB	302
81e97e21	303	crhold(cr);
8b4f9a2d BB	304
	305	iov.iov_len = MAXPATHLEN;
	306	iov.iov_base = link = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
	307
	308	uio.uio_iov = &iov;
	309	uio.uio_iovcnt = 1;
	310	uio.uio_resid = (MAXPATHLEN - 1);
	311	uio.uio_segflg = UIO_SYSSPACE;
	312
50950001	313	error = -zfs_readlink(ip, &uio, cr);
8b4f9a2d BB	314	if (error) {
	315	kmem_free(link, MAXPATHLEN);
	316	nd_set_link(nd, ERR_PTR(error));
	317	} else {
	318	nd_set_link(nd, link);
	319	}
	320
81e97e21	321	crfree(cr);
8b4f9a2d	322	return (NULL);
ee154f01 BB	323	}
	324
	325	static void
	326	zpl_put_link(struct dentry dentry, struct nameidata nd, void *ptr)
	327	{
0a6b03d3	328	const char *link = nd_get_link(nd);
ee154f01	329
ee154f01	330	if (!IS_ERR(link))
8b4f9a2d	331	kmem_free(link, MAXPATHLEN);
ee154f01 BB	332	}
	333
	334	static int
	335	zpl_link(struct dentry old_dentry, struct inode dir, struct dentry *dentry)
	336	{
81e97e21	337	cred_t *cr = CRED();
ee154f01	338	struct inode *ip = old_dentry->d_inode;
ee154f01 BB	339	int error;
	340
	341	if (ip->i_nlink >= ZFS_LINK_MAX)
	342	return -EMLINK;
	343
81e97e21	344	crhold(cr);
ee154f01 BB	345	ip->i_ctime = CURRENT_TIME_SEC;
	346	igrab(ip); /* Use ihold() if available */
	347
	348	error = -zfs_link(dir, ip, dname(dentry), cr);
	349	if (error) {
	350	iput(ip);
	351	goto out;
	352	}
	353
	354	d_instantiate(dentry, ip);
7b3e34ba	355	d_set_d_op(dentry, &zpl_dentry_operations);
ee154f01	356	out:
81e97e21	357	crfree(cr);
ee154f01 BB	358	ASSERT3S(error, <=, 0);
	359
	360	return (error);
	361	}
	362
ea1fdf46	363	#ifdef HAVE_INODE_TRUNCATE_RANGE
5cb63a57 ED	364	static void
	365	zpl_truncate_range(struct inode* ip, loff_t start, loff_t end)
	366	{
	367	cred_t *cr = CRED();
	368	flock64_t bf;
	369
	370	ASSERT3S(start, <=, end);
	371
	372	/*
	373	* zfs_freesp() will interpret (len == 0) as meaning "truncate until
	374	* the end of the file". We don't want that.
	375	*/
	376	if (start == end)
	377	return;
	378
	379	crhold(cr);
	380
	381	bf.l_type = F_WRLCK;
	382	bf.l_whence = 0;
	383	bf.l_start = start;
	384	bf.l_len = end - start;
	385	bf.l_pid = 0;
	386	zfs_space(ip, F_FREESP, &bf, FWRITE, start, cr);
	387
	388	crfree(cr);
	389	}
ea1fdf46	390	#endif /* HAVE_INODE_TRUNCATE_RANGE */
5cb63a57	391
cb2d1901 ED	392	#ifdef HAVE_INODE_FALLOCATE
	393	static long
	394	zpl_fallocate(struct inode *ip, int mode, loff_t offset, loff_t len)
	395	{
	396	return zpl_fallocate_common(ip, mode, offset, len);
	397	}
	398	#endif /* HAVE_INODE_FALLOCATE */
	399
7b3e34ba BB	400	static int
	401	#ifdef HAVE_D_REVALIDATE_NAMEIDATA
	402	zpl_revalidate(struct dentry dentry, struct nameidata nd)
	403	{
	404	unsigned int flags = nd->flags;
	405	#else
	406	zpl_revalidate(struct dentry *dentry, unsigned int flags)
	407	{
	408	#endif /* HAVE_D_REVALIDATE_NAMEIDATA */
	409	zfs_sb_t *zsb = dentry->d_sb->s_fs_info;
	410	int error;
	411
	412	if (flags & LOOKUP_RCU)
	413	return (-ECHILD);
	414
	415	/*
	416	* After a rollback negative dentries created before the rollback
	417	* time must be invalidated. Otherwise they can obscure files which
	418	* are only present in the rolled back dataset.
	419	*/
	420	if (dentry->d_inode == NULL) {
	421	spin_lock(&dentry->d_lock);
	422	error = time_before(dentry->d_time, zsb->z_rollback_time);
	423	spin_unlock(&dentry->d_lock);
	424
	425	if (error)
	426	return (0);
	427	}
	428
	429	/*
	430	* The dentry may reference a stale inode if a mounted file system
	431	* was rolled back to a point in time where the object didn't exist.
	432	*/
	433	if (dentry->d_inode && ITOZ(dentry->d_inode)->z_is_stale)
	434	return (0);
	435
	436	return (1);
	437	}
cb2d1901	438
ee154f01	439	const struct inode_operations zpl_inode_operations = {
ee154f01 BB	440	.create = zpl_create,
	441	.link = zpl_link,
	442	.unlink = zpl_unlink,
	443	.symlink = zpl_symlink,
	444	.mkdir = zpl_mkdir,
	445	.rmdir = zpl_rmdir,
	446	.mknod = zpl_mknod,
	447	.rename = zpl_rename,
	448	.setattr = zpl_setattr,
	449	.getattr = zpl_getattr,
	450	.setxattr = generic_setxattr,
	451	.getxattr = generic_getxattr,
	452	.removexattr = generic_removexattr,
	453	.listxattr = zpl_xattr_list,
ea1fdf46	454	#ifdef HAVE_INODE_TRUNCATE_RANGE
5cb63a57	455	.truncate_range = zpl_truncate_range,
ea1fdf46	456	#endif /* HAVE_INODE_TRUNCATE_RANGE */
cb2d1901 ED	457	#ifdef HAVE_INODE_FALLOCATE
	458	.fallocate = zpl_fallocate,
	459	#endif /* HAVE_INODE_FALLOCATE */
ee154f01 BB	460	};
	461
	462	const struct inode_operations zpl_dir_inode_operations = {
ee154f01 BB	463	.create = zpl_create,
	464	.lookup = zpl_lookup,
	465	.link = zpl_link,
	466	.unlink = zpl_unlink,
	467	.symlink = zpl_symlink,
	468	.mkdir = zpl_mkdir,
	469	.rmdir = zpl_rmdir,
	470	.mknod = zpl_mknod,
	471	.rename = zpl_rename,
	472	.setattr = zpl_setattr,
a6695d83 BB	473	.getattr = zpl_getattr,
	474	.setxattr = generic_setxattr,
	475	.getxattr = generic_getxattr,
	476	.removexattr = generic_removexattr,
	477	.listxattr = zpl_xattr_list,
ee154f01 BB	478	};
	479
	480	const struct inode_operations zpl_symlink_inode_operations = {
ee154f01 BB	481	.readlink = generic_readlink,
	482	.follow_link = zpl_follow_link,
	483	.put_link = zpl_put_link,
6f2255ba BB	484	.setattr = zpl_setattr,
6f2255ba BB	485	.getattr = zpl_getattr,
f31b3ebe BB	486	.setxattr = generic_setxattr,
	487	.getxattr = generic_getxattr,
	488	.removexattr = generic_removexattr,
	489	.listxattr = zpl_xattr_list,
ee154f01 BB	490	};
	491
	492	const struct inode_operations zpl_special_inode_operations = {
a6695d83 BB	493	.setattr = zpl_setattr,
	494	.getattr = zpl_getattr,
	495	.setxattr = generic_setxattr,
	496	.getxattr = generic_getxattr,
	497	.removexattr = generic_removexattr,
	498	.listxattr = zpl_xattr_list,
ee154f01	499	};
7b3e34ba BB	500
	501	dentry_operations_t zpl_dentry_operations = {
	502	.d_revalidate = zpl_revalidate,
	503	};