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

#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 dentry *dentry;
	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;

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

		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);
	}

	dentry = d_obtain_alias(inode);
	if (IS_ERR(dentry)) {
		iput(inode);
		return dentry;
	}
	err = ceph_init_dentry(dentry);
	if (err < 0) {
		dput(dentry);
		return ERR_PTR(err);
	}
	dout("__fh_to_dentry %llx %p dentry %p\n", ino, inode, dentry);
	return dentry;
}

/*
 * 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;
	struct dentry *dentry;
	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,
		};
	}
	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);

	dentry = d_obtain_alias(inode);
	if (IS_ERR(dentry)) {
		iput(inode);
		return dentry;
	}
	err = ceph_init_dentry(dentry);
	if (err < 0) {
		dput(dentry);
		return ERR_PTR(err);
	}
	dout("__get_parent ino %llx parent %p ino %llx.%llx\n",
	     child ? ceph_ino(d_inode(child)) : ino,
	     dentry, ceph_vinop(inode));
	return dentry;
}

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 (IS_ERR(dentry) && PTR_ERR(dentry) == -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);

	mutex_lock(&d_inode(parent)->i_mutex);

	req->r_inode = d_inode(child);
	ihold(d_inode(child));
	req->r_ino2 = ceph_vino(d_inode(parent));
	req->r_locked_dir = d_inode(parent);
	req->r_num_caps = 2;
	err = ceph_mdsc_do_request(mdsc, NULL, req);

	mutex_unlock(&d_inode(parent)->i_mutex);

	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
3d14c5d2	1	#include <linux/ceph/ceph_debug.h>
a8e63b7d SW	2
a8e63b7d SW	3	#include <linux/exportfs.h>
5a0e3ad6	4	#include <linux/slab.h>
a8e63b7d SW	5	#include <asm/unaligned.h>
	6
	7	#include "super.h"
3d14c5d2	8	#include "mds_client.h"
a8e63b7d	9
a8e63b7d SW	10	/*
	11	* Basic fh
	12	*/
	13	struct ceph_nfs_fh {
	14	u64 ino;
	15	} __attribute__ ((packed));
	16
	17	/*
4f32b42d	18	* Larger fh that includes parent ino.
a8e63b7d SW	19	*/
	20	struct ceph_nfs_confh {
	21	u64 ino, parent_ino;
a8e63b7d SW	22	} __attribute__ ((packed));
a8e63b7d SW	23
c862868b SW	24	static int ceph_encode_fh(struct inode inode, u32 rawfh, int *max_len,
c862868b SW	25	struct inode *parent_inode)
a8e63b7d	26	{
92923dcb	27	int type;
a8e63b7d SW	28	struct ceph_nfs_fh fh = (void )rawfh;
a8e63b7d SW	29	struct ceph_nfs_confh cfh = (void )rawfh;
92923dcb AK	30	int connected_handle_length = sizeof(*cfh)/4;
92923dcb AK	31	int handle_length = sizeof(*fh)/4;
a8e63b7d SW	32
	33	/* don't re-export snaps */
	34	if (ceph_snap(inode) != CEPH_NOSNAP)
	35	return -EINVAL;
	36
4f32b42d YZ	37	if (parent_inode && (*max_len < connected_handle_length)) {
	38	*max_len = connected_handle_length;
	39	return FILEID_INVALID;
	40	} else if (*max_len < handle_length) {
	41	*max_len = handle_length;
	42	return FILEID_INVALID;
	43	}
f6af75da	44
4f32b42d YZ	45	if (parent_inode) {
	46	dout("encode_fh %llx with parent %llx\n",
	47	ceph_ino(inode), ceph_ino(parent_inode));
c862868b	48	cfh->ino = ceph_ino(inode);
4f32b42d	49	cfh->parent_ino = ceph_ino(parent_inode);
92923dcb	50	*max_len = connected_handle_length;
4f32b42d	51	type = FILEID_INO32_GEN_PARENT;
a8e63b7d	52	} else {
4f32b42d YZ	53	dout("encode_fh %llx\n", ceph_ino(inode));
4f32b42d YZ	54	fh->ino = ceph_ino(inode);
bba0cd0e	55	*max_len = handle_length;
4f32b42d	56	type = FILEID_INO32_GEN;
a8e63b7d SW	57	}
	58	return type;
	59	}
	60
4f32b42d	61	static struct dentry __fh_to_dentry(struct super_block sb, u64 ino)
a8e63b7d	62	{
3c454cf2	63	struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
a8e63b7d SW	64	struct inode *inode;
	65	struct dentry *dentry;
	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) {
	73	struct ceph_mds_request *req;
	74
	75	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO,
	76	USE_ANY_MDS);
	77	if (IS_ERR(req))
	78	return ERR_CAST(req);
	79
	80	req->r_ino1 = vino;
	81	req->r_num_caps = 1;
	82	err = ceph_mdsc_do_request(mdsc, NULL, req);
45e3d3ee SW	83	inode = req->r_target_inode;
45e3d3ee SW	84	if (inode)
70b666c3	85	ihold(inode);
3c454cf2	86	ceph_mdsc_put_request(req);
3c454cf2 SW	87	if (!inode)
	88	return ERR_PTR(-ESTALE);
	89	}
a8e63b7d SW	90
a8e63b7d SW	91	dentry = d_obtain_alias(inode);
0d509c94	92	if (IS_ERR(dentry)) {
a8e63b7d	93	iput(inode);
0d509c94	94	return dentry;
a8e63b7d SW	95	}
a8e63b7d SW	96	err = ceph_init_dentry(dentry);
a8e63b7d	97	if (err < 0) {
4f32b42d	98	dput(dentry);
a8e63b7d SW	99	return ERR_PTR(err);
a8e63b7d SW	100	}
4f32b42d	101	dout("__fh_to_dentry %llx %p dentry %p\n", ino, inode, dentry);
a8e63b7d SW	102	return dentry;
	103	}
	104
	105	/*
4f32b42d	106	* convert regular fh to dentry
a8e63b7d	107	*/
4f32b42d YZ	108	static struct dentry ceph_fh_to_dentry(struct super_block sb,
	109	struct fid *fid,
	110	int fh_len, int fh_type)
a8e63b7d	111	{
4f32b42d	112	struct ceph_nfs_fh fh = (void )fid->raw;
a8e63b7d	113
4f32b42d YZ	114	if (fh_type != FILEID_INO32_GEN &&
	115	fh_type != FILEID_INO32_GEN_PARENT)
	116	return NULL;
	117	if (fh_len < sizeof(*fh) / 4)
	118	return NULL;
a8e63b7d	119
4f32b42d YZ	120	dout("fh_to_dentry %llx\n", fh->ino);
4f32b42d YZ	121	return __fh_to_dentry(sb, fh->ino);
a8e63b7d SW	122	}
a8e63b7d SW	123
9017c2ec YZ	124	static struct dentry __get_parent(struct super_block sb,
	125	struct dentry *child, u64 ino)
	126	{
	127	struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
	128	struct ceph_mds_request *req;
	129	struct inode *inode;
	130	struct dentry *dentry;
	131	int err;
	132
	133	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT,
	134	USE_ANY_MDS);
	135	if (IS_ERR(req))
	136	return ERR_CAST(req);
	137
	138	if (child) {
2b0143b5 DH	139	req->r_inode = d_inode(child);
2b0143b5 DH	140	ihold(d_inode(child));
9017c2ec YZ	141	} else {
	142	req->r_ino1 = (struct ceph_vino) {
	143	.ino = ino,
	144	.snap = CEPH_NOSNAP,
	145	};
	146	}
	147	req->r_num_caps = 1;
	148	err = ceph_mdsc_do_request(mdsc, NULL, req);
	149	inode = req->r_target_inode;
	150	if (inode)
	151	ihold(inode);
	152	ceph_mdsc_put_request(req);
	153	if (!inode)
	154	return ERR_PTR(-ENOENT);
	155
	156	dentry = d_obtain_alias(inode);
	157	if (IS_ERR(dentry)) {
	158	iput(inode);
	159	return dentry;
	160	}
	161	err = ceph_init_dentry(dentry);
	162	if (err < 0) {
	163	dput(dentry);
	164	return ERR_PTR(err);
	165	}
	166	dout("__get_parent ino %llx parent %p ino %llx.%llx\n",
2b0143b5	167	child ? ceph_ino(d_inode(child)) : ino,
9017c2ec YZ	168	dentry, ceph_vinop(inode));
	169	return dentry;
	170	}
	171
e84be11c	172	static struct dentry ceph_get_parent(struct dentry child)
9017c2ec YZ	173	{
9017c2ec YZ	174	/* don't re-export snaps */
2b0143b5	175	if (ceph_snap(d_inode(child)) != CEPH_NOSNAP)
9017c2ec YZ	176	return ERR_PTR(-EINVAL);
	177
	178	dout("get_parent %p ino %llx.%llx\n",
2b0143b5	179	child, ceph_vinop(d_inode(child)));
9017c2ec YZ	180	return __get_parent(child->d_sb, child, 0);
	181	}
	182
a8e63b7d	183	/*
8996f4f2	184	* convert regular fh to parent
a8e63b7d SW	185	*/
a8e63b7d SW	186	static struct dentry ceph_fh_to_parent(struct super_block sb,
8996f4f2	187	struct fid *fid,
a8e63b7d SW	188	int fh_len, int fh_type)
	189	{
	190	struct ceph_nfs_confh cfh = (void )fid->raw;
a8e63b7d	191	struct dentry *dentry;
a8e63b7d	192
8996f4f2 YZ	193	if (fh_type != FILEID_INO32_GEN_PARENT)
8996f4f2 YZ	194	return NULL;
35c2a7f4	195	if (fh_len < sizeof(*cfh) / 4)
8996f4f2	196	return NULL;
a8e63b7d	197
8996f4f2 YZ	198	dout("fh_to_parent %llx\n", cfh->parent_ino);
	199	dentry = __get_parent(sb, NULL, cfh->ino);
	200	if (IS_ERR(dentry) && PTR_ERR(dentry) == -ENOENT)
	201	dentry = __fh_to_dentry(sb, cfh->parent_ino);
a8e63b7d SW	202	return dentry;
	203	}
	204
19913b4e YZ	205	static int ceph_get_name(struct dentry parent, char name,
	206	struct dentry *child)
	207	{
	208	struct ceph_mds_client *mdsc;
	209	struct ceph_mds_request *req;
	210	int err;
	211
2b0143b5	212	mdsc = ceph_inode_to_client(d_inode(child))->mdsc;
19913b4e YZ	213	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME,
	214	USE_ANY_MDS);
	215	if (IS_ERR(req))
	216	return PTR_ERR(req);
	217
2b0143b5	218	mutex_lock(&d_inode(parent)->i_mutex);
19913b4e	219
2b0143b5 DH	220	req->r_inode = d_inode(child);
	221	ihold(d_inode(child));
	222	req->r_ino2 = ceph_vino(d_inode(parent));
	223	req->r_locked_dir = d_inode(parent);
19913b4e YZ	224	req->r_num_caps = 2;
	225	err = ceph_mdsc_do_request(mdsc, NULL, req);
	226
2b0143b5	227	mutex_unlock(&d_inode(parent)->i_mutex);
19913b4e YZ	228
	229	if (!err) {
	230	struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
	231	memcpy(name, rinfo->dname, rinfo->dname_len);
	232	name[rinfo->dname_len] = 0;
	233	dout("get_name %p ino %llx.%llx name %s\n",
2b0143b5	234	child, ceph_vinop(d_inode(child)), name);
19913b4e YZ	235	} else {
19913b4e YZ	236	dout("get_name %p ino %llx.%llx err %d\n",
2b0143b5	237	child, ceph_vinop(d_inode(child)), err);
19913b4e YZ	238	}
	239
	240	ceph_mdsc_put_request(req);
	241	return err;
	242	}
	243
a8e63b7d SW	244	const struct export_operations ceph_export_ops = {
	245	.encode_fh = ceph_encode_fh,
	246	.fh_to_dentry = ceph_fh_to_dentry,
	247	.fh_to_parent = ceph_fh_to_parent,
9017c2ec	248	.get_parent = ceph_get_parent,
19913b4e	249	.get_name = ceph_get_name,
a8e63b7d	250	};