[linux-2.6-block.git] / fs / ceph / export.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/ceph/ceph_debug.h>

#include <linux/exportfs.h>
#include <linux/slab.h>
#include <asm/unaligned.h>

#include "super.h"
#include "mds_client.h"

/*
 * Basic fh
 */
struct ceph_nfs_fh {
	u64 ino;
} __attribute__ ((packed));

/*
 * Larger fh that includes parent ino.
 */
struct ceph_nfs_confh {
	u64 ino, parent_ino;
} __attribute__ ((packed));

static int ceph_encode_fh(struct inode *inode, u32 *rawfh, int *max_len,
			  struct inode *parent_inode)
{
	int type;
	struct ceph_nfs_fh *fh = (void *)rawfh;
	struct ceph_nfs_confh *cfh = (void *)rawfh;
	int connected_handle_length = sizeof(*cfh)/4;
	int handle_length = sizeof(*fh)/4;

	/* don't re-export snaps */
	if (ceph_snap(inode) != CEPH_NOSNAP)
		return -EINVAL;

	if (parent_inode && (*max_len < connected_handle_length)) {
		*max_len = connected_handle_length;
		return FILEID_INVALID;
	} else if (*max_len < handle_length) {
		*max_len = handle_length;
		return FILEID_INVALID;
	}

	if (parent_inode) {
		dout("encode_fh %llx with parent %llx\n",
		     ceph_ino(inode), ceph_ino(parent_inode));
		cfh->ino = ceph_ino(inode);
		cfh->parent_ino = ceph_ino(parent_inode);
		*max_len = connected_handle_length;
		type = FILEID_INO32_GEN_PARENT;
	} else {
		dout("encode_fh %llx\n", ceph_ino(inode));
		fh->ino = ceph_ino(inode);
		*max_len = handle_length;
		type = FILEID_INO32_GEN;
	}
	return type;
}

static struct dentry *__fh_to_dentry(struct super_block *sb, u64 ino)
{
	struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
	struct inode *inode;
	struct ceph_vino vino;
	int err;

	vino.ino = ino;
	vino.snap = CEPH_NOSNAP;
	inode = ceph_find_inode(sb, vino);
	if (!inode) {
		struct ceph_mds_request *req;
		int mask;

		req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO,
					       USE_ANY_MDS);
		if (IS_ERR(req))
			return ERR_CAST(req);

		mask = CEPH_STAT_CAP_INODE;
		if (ceph_security_xattr_wanted(d_inode(sb->s_root)))
			mask |= CEPH_CAP_XATTR_SHARED;
		req->r_args.getattr.mask = cpu_to_le32(mask);

		req->r_ino1 = vino;
		req->r_num_caps = 1;
		err = ceph_mdsc_do_request(mdsc, NULL, req);
		inode = req->r_target_inode;
		if (inode)
			ihold(inode);
		ceph_mdsc_put_request(req);
		if (!inode)
			return ERR_PTR(-ESTALE);
		if (inode->i_nlink == 0) {
			iput(inode);
			return ERR_PTR(-ESTALE);
		}
	}

	return d_obtain_alias(inode);
}

/*
 * convert regular fh to dentry
 */
static struct dentry *ceph_fh_to_dentry(struct super_block *sb,
					struct fid *fid,
					int fh_len, int fh_type)
{
	struct ceph_nfs_fh *fh = (void *)fid->raw;

	if (fh_type != FILEID_INO32_GEN  &&
	    fh_type != FILEID_INO32_GEN_PARENT)
		return NULL;
	if (fh_len < sizeof(*fh) / 4)
		return NULL;

	dout("fh_to_dentry %llx\n", fh->ino);
	return __fh_to_dentry(sb, fh->ino);
}

static struct dentry *__get_parent(struct super_block *sb,
				   struct dentry *child, u64 ino)
{
	struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
	struct ceph_mds_request *req;
	struct inode *inode;
	int mask;
	int err;

	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT,
				       USE_ANY_MDS);
	if (IS_ERR(req))
		return ERR_CAST(req);

	if (child) {
		req->r_inode = d_inode(child);
		ihold(d_inode(child));
	} else {
		req->r_ino1 = (struct ceph_vino) {
			.ino = ino,
			.snap = CEPH_NOSNAP,
		};
	}

	mask = CEPH_STAT_CAP_INODE;
	if (ceph_security_xattr_wanted(d_inode(sb->s_root)))
		mask |= CEPH_CAP_XATTR_SHARED;
	req->r_args.getattr.mask = cpu_to_le32(mask);

	req->r_num_caps = 1;
	err = ceph_mdsc_do_request(mdsc, NULL, req);
	inode = req->r_target_inode;
	if (inode)
		ihold(inode);
	ceph_mdsc_put_request(req);
	if (!inode)
		return ERR_PTR(-ENOENT);

	return d_obtain_alias(inode);
}

static struct dentry *ceph_get_parent(struct dentry *child)
{
	/* don't re-export snaps */
	if (ceph_snap(d_inode(child)) != CEPH_NOSNAP)
		return ERR_PTR(-EINVAL);

	dout("get_parent %p ino %llx.%llx\n",
	     child, ceph_vinop(d_inode(child)));
	return __get_parent(child->d_sb, child, 0);
}

/*
 * convert regular fh to parent
 */
static struct dentry *ceph_fh_to_parent(struct super_block *sb,
					struct fid *fid,
					int fh_len, int fh_type)
{
	struct ceph_nfs_confh *cfh = (void *)fid->raw;
	struct dentry *dentry;

	if (fh_type != FILEID_INO32_GEN_PARENT)
		return NULL;
	if (fh_len < sizeof(*cfh) / 4)
		return NULL;

	dout("fh_to_parent %llx\n", cfh->parent_ino);
	dentry = __get_parent(sb, NULL, cfh->ino);
	if (unlikely(dentry == ERR_PTR(-ENOENT)))
		dentry = __fh_to_dentry(sb, cfh->parent_ino);
	return dentry;
}

static int ceph_get_name(struct dentry *parent, char *name,
			 struct dentry *child)
{
	struct ceph_mds_client *mdsc;
	struct ceph_mds_request *req;
	int err;

	mdsc = ceph_inode_to_client(d_inode(child))->mdsc;
	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME,
				       USE_ANY_MDS);
	if (IS_ERR(req))
		return PTR_ERR(req);

	inode_lock(d_inode(parent));

	req->r_inode = d_inode(child);
	ihold(d_inode(child));
	req->r_ino2 = ceph_vino(d_inode(parent));
	req->r_parent = d_inode(parent);
	set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
	req->r_num_caps = 2;
	err = ceph_mdsc_do_request(mdsc, NULL, req);

	inode_unlock(d_inode(parent));

	if (!err) {
		struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
		memcpy(name, rinfo->dname, rinfo->dname_len);
		name[rinfo->dname_len] = 0;
		dout("get_name %p ino %llx.%llx name %s\n",
		     child, ceph_vinop(d_inode(child)), name);
	} else {
		dout("get_name %p ino %llx.%llx err %d\n",
		     child, ceph_vinop(d_inode(child)), err);
	}

	ceph_mdsc_put_request(req);
	return err;
}

const struct export_operations ceph_export_ops = {
	.encode_fh = ceph_encode_fh,
	.fh_to_dentry = ceph_fh_to_dentry,
	.fh_to_parent = ceph_fh_to_parent,
	.get_parent = ceph_get_parent,
	.get_name = ceph_get_name,
};
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
3d14c5d2	2	#include <linux/ceph/ceph_debug.h>
a8e63b7d SW	3
a8e63b7d SW	4	#include <linux/exportfs.h>
5a0e3ad6	5	#include <linux/slab.h>
a8e63b7d SW	6	#include <asm/unaligned.h>
	7
	8	#include "super.h"
3d14c5d2	9	#include "mds_client.h"
a8e63b7d	10
a8e63b7d SW	11	/*
	12	* Basic fh
	13	*/
	14	struct ceph_nfs_fh {
	15	u64 ino;
	16	} __attribute__ ((packed));
	17
	18	/*
4f32b42d	19	* Larger fh that includes parent ino.
a8e63b7d SW	20	*/
	21	struct ceph_nfs_confh {
	22	u64 ino, parent_ino;
a8e63b7d SW	23	} __attribute__ ((packed));
a8e63b7d SW	24
c862868b SW	25	static int ceph_encode_fh(struct inode inode, u32 rawfh, int *max_len,
c862868b SW	26	struct inode *parent_inode)
a8e63b7d	27	{
92923dcb	28	int type;
a8e63b7d SW	29	struct ceph_nfs_fh fh = (void )rawfh;
a8e63b7d SW	30	struct ceph_nfs_confh cfh = (void )rawfh;
92923dcb AK	31	int connected_handle_length = sizeof(*cfh)/4;
92923dcb AK	32	int handle_length = sizeof(*fh)/4;
a8e63b7d SW	33
	34	/* don't re-export snaps */
	35	if (ceph_snap(inode) != CEPH_NOSNAP)
	36	return -EINVAL;
	37
4f32b42d YZ	38	if (parent_inode && (*max_len < connected_handle_length)) {
	39	*max_len = connected_handle_length;
	40	return FILEID_INVALID;
	41	} else if (*max_len < handle_length) {
	42	*max_len = handle_length;
	43	return FILEID_INVALID;
	44	}
f6af75da	45
4f32b42d YZ	46	if (parent_inode) {
	47	dout("encode_fh %llx with parent %llx\n",
	48	ceph_ino(inode), ceph_ino(parent_inode));
c862868b	49	cfh->ino = ceph_ino(inode);
4f32b42d	50	cfh->parent_ino = ceph_ino(parent_inode);
92923dcb	51	*max_len = connected_handle_length;
4f32b42d	52	type = FILEID_INO32_GEN_PARENT;
a8e63b7d	53	} else {
4f32b42d YZ	54	dout("encode_fh %llx\n", ceph_ino(inode));
4f32b42d YZ	55	fh->ino = ceph_ino(inode);
bba0cd0e	56	*max_len = handle_length;
4f32b42d	57	type = FILEID_INO32_GEN;
a8e63b7d SW	58	}
	59	return type;
	60	}
	61
4f32b42d	62	static struct dentry __fh_to_dentry(struct super_block sb, u64 ino)
a8e63b7d	63	{
3c454cf2	64	struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
a8e63b7d	65	struct inode *inode;
a8e63b7d SW	66	struct ceph_vino vino;
	67	int err;
	68
4f32b42d	69	vino.ino = ino;
a8e63b7d SW	70	vino.snap = CEPH_NOSNAP;
a8e63b7d SW	71	inode = ceph_find_inode(sb, vino);
3c454cf2 SW	72	if (!inode) {
3c454cf2 SW	73	struct ceph_mds_request *req;
315f2408	74	int mask;
3c454cf2 SW	75
	76	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO,
	77	USE_ANY_MDS);
	78	if (IS_ERR(req))
	79	return ERR_CAST(req);
	80
315f2408 YZ	81	mask = CEPH_STAT_CAP_INODE;
	82	if (ceph_security_xattr_wanted(d_inode(sb->s_root)))
	83	mask \|= CEPH_CAP_XATTR_SHARED;
	84	req->r_args.getattr.mask = cpu_to_le32(mask);
	85
3c454cf2 SW	86	req->r_ino1 = vino;
	87	req->r_num_caps = 1;
	88	err = ceph_mdsc_do_request(mdsc, NULL, req);
45e3d3ee SW	89	inode = req->r_target_inode;
45e3d3ee SW	90	if (inode)
70b666c3	91	ihold(inode);
3c454cf2	92	ceph_mdsc_put_request(req);
3c454cf2 SW	93	if (!inode)
3c454cf2 SW	94	return ERR_PTR(-ESTALE);
03f21904 LH	95	if (inode->i_nlink == 0) {
	96	iput(inode);
	97	return ERR_PTR(-ESTALE);
	98	}
3c454cf2	99	}
a8e63b7d	100
ad5cb123	101	return d_obtain_alias(inode);
a8e63b7d SW	102	}
	103
	104	/*
4f32b42d	105	* convert regular fh to dentry
a8e63b7d	106	*/
4f32b42d YZ	107	static struct dentry ceph_fh_to_dentry(struct super_block sb,
	108	struct fid *fid,
	109	int fh_len, int fh_type)
a8e63b7d	110	{
4f32b42d	111	struct ceph_nfs_fh fh = (void )fid->raw;
a8e63b7d	112
4f32b42d YZ	113	if (fh_type != FILEID_INO32_GEN &&
	114	fh_type != FILEID_INO32_GEN_PARENT)
	115	return NULL;
	116	if (fh_len < sizeof(*fh) / 4)
	117	return NULL;
a8e63b7d	118
4f32b42d YZ	119	dout("fh_to_dentry %llx\n", fh->ino);
4f32b42d YZ	120	return __fh_to_dentry(sb, fh->ino);
a8e63b7d SW	121	}
a8e63b7d SW	122
9017c2ec YZ	123	static struct dentry __get_parent(struct super_block sb,
	124	struct dentry *child, u64 ino)
	125	{
	126	struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
	127	struct ceph_mds_request *req;
	128	struct inode *inode;
315f2408	129	int mask;
9017c2ec YZ	130	int err;
	131
	132	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT,
	133	USE_ANY_MDS);
	134	if (IS_ERR(req))
	135	return ERR_CAST(req);
	136
	137	if (child) {
2b0143b5 DH	138	req->r_inode = d_inode(child);
2b0143b5 DH	139	ihold(d_inode(child));
9017c2ec YZ	140	} else {
	141	req->r_ino1 = (struct ceph_vino) {
	142	.ino = ino,
	143	.snap = CEPH_NOSNAP,
	144	};
	145	}
315f2408 YZ	146
	147	mask = CEPH_STAT_CAP_INODE;
	148	if (ceph_security_xattr_wanted(d_inode(sb->s_root)))
	149	mask \|= CEPH_CAP_XATTR_SHARED;
	150	req->r_args.getattr.mask = cpu_to_le32(mask);
	151
9017c2ec YZ	152	req->r_num_caps = 1;
	153	err = ceph_mdsc_do_request(mdsc, NULL, req);
	154	inode = req->r_target_inode;
	155	if (inode)
	156	ihold(inode);
	157	ceph_mdsc_put_request(req);
	158	if (!inode)
	159	return ERR_PTR(-ENOENT);
	160
ad5cb123	161	return d_obtain_alias(inode);
9017c2ec YZ	162	}
9017c2ec YZ	163
e84be11c	164	static struct dentry ceph_get_parent(struct dentry child)
9017c2ec YZ	165	{
9017c2ec YZ	166	/* don't re-export snaps */
2b0143b5	167	if (ceph_snap(d_inode(child)) != CEPH_NOSNAP)
9017c2ec YZ	168	return ERR_PTR(-EINVAL);
	169
	170	dout("get_parent %p ino %llx.%llx\n",
2b0143b5	171	child, ceph_vinop(d_inode(child)));
9017c2ec YZ	172	return __get_parent(child->d_sb, child, 0);
	173	}
	174
a8e63b7d	175	/*
8996f4f2	176	* convert regular fh to parent
a8e63b7d SW	177	*/
a8e63b7d SW	178	static struct dentry ceph_fh_to_parent(struct super_block sb,
8996f4f2	179	struct fid *fid,
a8e63b7d SW	180	int fh_len, int fh_type)
	181	{
	182	struct ceph_nfs_confh cfh = (void )fid->raw;
a8e63b7d	183	struct dentry *dentry;
a8e63b7d	184
8996f4f2 YZ	185	if (fh_type != FILEID_INO32_GEN_PARENT)
8996f4f2 YZ	186	return NULL;
35c2a7f4	187	if (fh_len < sizeof(*cfh) / 4)
8996f4f2	188	return NULL;
a8e63b7d	189
8996f4f2 YZ	190	dout("fh_to_parent %llx\n", cfh->parent_ino);
8996f4f2 YZ	191	dentry = __get_parent(sb, NULL, cfh->ino);
b42b90d1	192	if (unlikely(dentry == ERR_PTR(-ENOENT)))
8996f4f2	193	dentry = __fh_to_dentry(sb, cfh->parent_ino);
a8e63b7d SW	194	return dentry;
	195	}
	196
19913b4e YZ	197	static int ceph_get_name(struct dentry parent, char name,
	198	struct dentry *child)
	199	{
	200	struct ceph_mds_client *mdsc;
	201	struct ceph_mds_request *req;
	202	int err;
	203
2b0143b5	204	mdsc = ceph_inode_to_client(d_inode(child))->mdsc;
19913b4e YZ	205	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME,
	206	USE_ANY_MDS);
	207	if (IS_ERR(req))
	208	return PTR_ERR(req);
	209
5955102c	210	inode_lock(d_inode(parent));
19913b4e	211
2b0143b5 DH	212	req->r_inode = d_inode(child);
	213	ihold(d_inode(child));
	214	req->r_ino2 = ceph_vino(d_inode(parent));
3dd69aab JL	215	req->r_parent = d_inode(parent);
3dd69aab JL	216	set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
19913b4e YZ	217	req->r_num_caps = 2;
	218	err = ceph_mdsc_do_request(mdsc, NULL, req);
	219
5955102c	220	inode_unlock(d_inode(parent));
19913b4e YZ	221
	222	if (!err) {
	223	struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
	224	memcpy(name, rinfo->dname, rinfo->dname_len);
	225	name[rinfo->dname_len] = 0;
	226	dout("get_name %p ino %llx.%llx name %s\n",
2b0143b5	227	child, ceph_vinop(d_inode(child)), name);
19913b4e YZ	228	} else {
19913b4e YZ	229	dout("get_name %p ino %llx.%llx err %d\n",
2b0143b5	230	child, ceph_vinop(d_inode(child)), err);
19913b4e YZ	231	}
	232
	233	ceph_mdsc_put_request(req);
	234	return err;
	235	}
	236
a8e63b7d SW	237	const struct export_operations ceph_export_ops = {
	238	.encode_fh = ceph_encode_fh,
	239	.fh_to_dentry = ceph_fh_to_dentry,
	240	.fh_to_parent = ceph_fh_to_parent,
9017c2ec	241	.get_parent = ceph_get_parent,
19913b4e	242	.get_name = ceph_get_name,
a8e63b7d	243	};