Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) #include <linux/ceph/ceph_debug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include <linux/exportfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <asm/unaligned.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include "super.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include "mds_client.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * Basic fh
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) struct ceph_nfs_fh {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 	u64 ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) } __attribute__ ((packed));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * Larger fh that includes parent ino.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) struct ceph_nfs_confh {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	u64 ino, parent_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) } __attribute__ ((packed));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  * fh for snapped inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) struct ceph_nfs_snapfh {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	u64 ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	u64 snapid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	u64 parent_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	u32 hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) } __attribute__ ((packed));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) static int ceph_encode_snapfh(struct inode *inode, u32 *rawfh, int *max_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 			      struct inode *parent_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	static const int snap_handle_length =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		sizeof(struct ceph_nfs_snapfh) >> 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	struct ceph_nfs_snapfh *sfh = (void *)rawfh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	u64 snapid = ceph_snap(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	bool no_parent = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	if (*max_len < snap_handle_length) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 		*max_len = snap_handle_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		ret = FILEID_INVALID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	ret =  -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	if (snapid != CEPH_SNAPDIR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		struct inode *dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		struct dentry *dentry = d_find_alias(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		if (!dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		dir = d_inode_rcu(dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		if (ceph_snap(dir) != CEPH_SNAPDIR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 			sfh->parent_ino = ceph_ino(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 			sfh->hash = ceph_dentry_hash(dir, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 			no_parent = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		dput(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	if (no_parent) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		if (!S_ISDIR(inode->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		sfh->parent_ino = sfh->ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		sfh->hash = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	sfh->ino = ceph_ino(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	sfh->snapid = snapid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	*max_len = snap_handle_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	ret = FILEID_BTRFS_WITH_PARENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	dout("encode_snapfh %llx.%llx ret=%d\n", ceph_vinop(inode), ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) static int ceph_encode_fh(struct inode *inode, u32 *rawfh, int *max_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 			  struct inode *parent_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	static const int handle_length =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		sizeof(struct ceph_nfs_fh) >> 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	static const int connected_handle_length =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		sizeof(struct ceph_nfs_confh) >> 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	int type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	if (ceph_snap(inode) != CEPH_NOSNAP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		return ceph_encode_snapfh(inode, rawfh, max_len, parent_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	if (parent_inode && (*max_len < connected_handle_length)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		*max_len = connected_handle_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		return FILEID_INVALID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	} else if (*max_len < handle_length) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		*max_len = handle_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		return FILEID_INVALID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	if (parent_inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		struct ceph_nfs_confh *cfh = (void *)rawfh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		dout("encode_fh %llx with parent %llx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		     ceph_ino(inode), ceph_ino(parent_inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		cfh->ino = ceph_ino(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		cfh->parent_ino = ceph_ino(parent_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		*max_len = connected_handle_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		type = FILEID_INO32_GEN_PARENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		struct ceph_nfs_fh *fh = (void *)rawfh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		dout("encode_fh %llx\n", ceph_ino(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		fh->ino = ceph_ino(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		*max_len = handle_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		type = FILEID_INO32_GEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	return type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static struct inode *__lookup_inode(struct super_block *sb, u64 ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	struct ceph_vino vino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	vino.ino = ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	vino.snap = CEPH_NOSNAP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	if (ceph_vino_is_reserved(vino))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		return ERR_PTR(-ESTALE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	inode = ceph_find_inode(sb, vino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	if (!inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		struct ceph_mds_request *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		int mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 					       USE_ANY_MDS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		if (IS_ERR(req))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 			return ERR_CAST(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		mask = CEPH_STAT_CAP_INODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		if (ceph_security_xattr_wanted(d_inode(sb->s_root)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			mask |= CEPH_CAP_XATTR_SHARED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		req->r_args.lookupino.mask = cpu_to_le32(mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		req->r_ino1 = vino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		req->r_num_caps = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		err = ceph_mdsc_do_request(mdsc, NULL, req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		inode = req->r_target_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		if (inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 			ihold(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		ceph_mdsc_put_request(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		if (!inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			return err < 0 ? ERR_PTR(err) : ERR_PTR(-ESTALE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	return inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) struct inode *ceph_lookup_inode(struct super_block *sb, u64 ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	struct inode *inode = __lookup_inode(sb, ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	if (IS_ERR(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		return inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	if (inode->i_nlink == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		return ERR_PTR(-ESTALE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	return inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) static struct dentry *__fh_to_dentry(struct super_block *sb, u64 ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	struct inode *inode = __lookup_inode(sb, ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	if (IS_ERR(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		return ERR_CAST(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	/* We need LINK caps to reliably check i_nlink */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	err = ceph_do_getattr(inode, CEPH_CAP_LINK_SHARED, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	/* -ESTALE if inode as been unlinked and no file is open */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	if ((inode->i_nlink == 0) && (atomic_read(&inode->i_count) == 1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		return ERR_PTR(-ESTALE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	return d_obtain_alias(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) static struct dentry *__snapfh_to_dentry(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 					  struct ceph_nfs_snapfh *sfh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 					  bool want_parent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	struct ceph_mds_request *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	struct ceph_vino vino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	int mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	bool unlinked = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	if (want_parent) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		vino.ino = sfh->parent_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		if (sfh->snapid == CEPH_SNAPDIR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 			vino.snap = CEPH_NOSNAP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		else if (sfh->ino == sfh->parent_ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 			vino.snap = CEPH_SNAPDIR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 			vino.snap = sfh->snapid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		vino.ino = sfh->ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		vino.snap = sfh->snapid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	if (ceph_vino_is_reserved(vino))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		return ERR_PTR(-ESTALE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	inode = ceph_find_inode(sb, vino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	if (inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		return d_obtain_alias(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 				       USE_ANY_MDS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	if (IS_ERR(req))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		return ERR_CAST(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	mask = CEPH_STAT_CAP_INODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	if (ceph_security_xattr_wanted(d_inode(sb->s_root)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		mask |= CEPH_CAP_XATTR_SHARED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	req->r_args.lookupino.mask = cpu_to_le32(mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	if (vino.snap < CEPH_NOSNAP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		req->r_args.lookupino.snapid = cpu_to_le64(vino.snap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		if (!want_parent && sfh->ino != sfh->parent_ino) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 			req->r_args.lookupino.parent =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 					cpu_to_le64(sfh->parent_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 			req->r_args.lookupino.hash =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 					cpu_to_le32(sfh->hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	req->r_ino1 = vino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	req->r_num_caps = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	err = ceph_mdsc_do_request(mdsc, NULL, req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	inode = req->r_target_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	if (inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		if (vino.snap == CEPH_SNAPDIR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 			if (inode->i_nlink == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 				unlinked = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 			inode = ceph_get_snapdir(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		} else if (ceph_snap(inode) == vino.snap) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 			ihold(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 			/* mds does not support lookup snapped inode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 			err = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 			inode = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	ceph_mdsc_put_request(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	if (want_parent) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		dout("snapfh_to_parent %llx.%llx\n err=%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		     vino.ino, vino.snap, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		dout("snapfh_to_dentry %llx.%llx parent %llx hash %x err=%d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		      vino.ino, vino.snap, sfh->parent_ino, sfh->hash, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	if (!inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		return ERR_PTR(-ESTALE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	/* see comments in ceph_get_parent() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	return unlinked ? d_obtain_root(inode) : d_obtain_alias(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)  * convert regular fh to dentry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) static struct dentry *ceph_fh_to_dentry(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 					struct fid *fid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 					int fh_len, int fh_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	struct ceph_nfs_fh *fh = (void *)fid->raw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	if (fh_type == FILEID_BTRFS_WITH_PARENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		struct ceph_nfs_snapfh *sfh = (void *)fid->raw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		return __snapfh_to_dentry(sb, sfh, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	if (fh_type != FILEID_INO32_GEN  &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	    fh_type != FILEID_INO32_GEN_PARENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	if (fh_len < sizeof(*fh) / 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	dout("fh_to_dentry %llx\n", fh->ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	return __fh_to_dentry(sb, fh->ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) static struct dentry *__get_parent(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 				   struct dentry *child, u64 ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	struct ceph_mds_request *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	int mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 				       USE_ANY_MDS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	if (IS_ERR(req))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		return ERR_CAST(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	if (child) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		req->r_inode = d_inode(child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		ihold(d_inode(child));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		req->r_ino1 = (struct ceph_vino) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 			.ino = ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 			.snap = CEPH_NOSNAP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	mask = CEPH_STAT_CAP_INODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	if (ceph_security_xattr_wanted(d_inode(sb->s_root)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		mask |= CEPH_CAP_XATTR_SHARED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	req->r_args.getattr.mask = cpu_to_le32(mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	req->r_num_caps = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	err = ceph_mdsc_do_request(mdsc, NULL, req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		ceph_mdsc_put_request(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 		return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	inode = req->r_target_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	if (inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		ihold(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	ceph_mdsc_put_request(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	if (!inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 		return ERR_PTR(-ENOENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	return d_obtain_alias(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) static struct dentry *ceph_get_parent(struct dentry *child)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	struct inode *inode = d_inode(child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	struct dentry *dn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	if (ceph_snap(inode) != CEPH_NOSNAP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 		struct inode* dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 		bool unlinked = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		/* do not support non-directory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		if (!d_is_dir(child)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 			dn = ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		dir = __lookup_inode(inode->i_sb, ceph_ino(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		if (IS_ERR(dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 			dn = ERR_CAST(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 		/* There can be multiple paths to access snapped inode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		 * For simplicity, treat snapdir of head inode as parent */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		if (ceph_snap(inode) != CEPH_SNAPDIR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 			struct inode *snapdir = ceph_get_snapdir(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 			if (dir->i_nlink == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 				unlinked = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 			iput(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 			if (IS_ERR(snapdir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 				dn = ERR_CAST(snapdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 			dir = snapdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 		/* If directory has already been deleted, futher get_parent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 		 * will fail. Do not mark snapdir dentry as disconnected,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 		 * this prevent exportfs from doing futher get_parent. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 		if (unlinked)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 			dn = d_obtain_root(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 			dn = d_obtain_alias(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 		dn = __get_parent(child->d_sb, child, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	dout("get_parent %p ino %llx.%llx err=%ld\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	     child, ceph_vinop(inode), (long)PTR_ERR_OR_ZERO(dn));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	return dn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)  * convert regular fh to parent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) static struct dentry *ceph_fh_to_parent(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 					struct fid *fid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 					int fh_len, int fh_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 	struct ceph_nfs_confh *cfh = (void *)fid->raw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	struct dentry *dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	if (fh_type == FILEID_BTRFS_WITH_PARENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 		struct ceph_nfs_snapfh *sfh = (void *)fid->raw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 		return __snapfh_to_dentry(sb, sfh, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	if (fh_type != FILEID_INO32_GEN_PARENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 	if (fh_len < sizeof(*cfh) / 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 	dout("fh_to_parent %llx\n", cfh->parent_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 	dentry = __get_parent(sb, NULL, cfh->ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 	if (unlikely(dentry == ERR_PTR(-ENOENT)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 		dentry = __fh_to_dentry(sb, cfh->parent_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 	return dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) static int __get_snap_name(struct dentry *parent, char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 			   struct dentry *child)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	struct inode *inode = d_inode(child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 	struct inode *dir = d_inode(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 	struct ceph_mds_request *req = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 	char *last_name = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 	unsigned next_offset = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	int err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	if (ceph_ino(inode) != ceph_ino(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 	if (ceph_snap(inode) == CEPH_SNAPDIR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 		if (ceph_snap(dir) == CEPH_NOSNAP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 			strcpy(name, fsc->mount_options->snapdir_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 			err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 	if (ceph_snap(dir) != CEPH_SNAPDIR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 	while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 		struct ceph_mds_reply_info_parsed *rinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 		struct ceph_mds_reply_dir_entry *rde;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 		int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 		req = ceph_mdsc_create_request(fsc->mdsc, CEPH_MDS_OP_LSSNAP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 					       USE_AUTH_MDS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 		if (IS_ERR(req)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) 			err = PTR_ERR(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) 			req = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 		err = ceph_alloc_readdir_reply_buffer(req, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) 		if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) 		req->r_direct_mode = USE_AUTH_MDS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) 		req->r_readdir_offset = next_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) 		req->r_args.readdir.flags =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) 				cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) 		if (last_name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) 			req->r_path2 = last_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) 			last_name = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) 		req->r_inode = dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) 		ihold(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) 		req->r_dentry = dget(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) 		inode_lock(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) 		err = ceph_mdsc_do_request(fsc->mdsc, NULL, req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) 		inode_unlock(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) 		if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) 		rinfo = &req->r_reply_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) 		for (i = 0; i < rinfo->dir_nr; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) 			rde = rinfo->dir_entries + i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) 			BUG_ON(!rde->inode.in);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) 			if (ceph_snap(inode) ==
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) 			    le64_to_cpu(rde->inode.in->snapid)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) 				memcpy(name, rde->name, rde->name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) 				name[rde->name_len] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) 				err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) 		if (rinfo->dir_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) 		BUG_ON(rinfo->dir_nr <= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) 		rde = rinfo->dir_entries + (rinfo->dir_nr - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) 		next_offset += rinfo->dir_nr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) 		last_name = kstrndup(rde->name, rde->name_len, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) 		if (!last_name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) 			err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) 		ceph_mdsc_put_request(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) 		req = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) 	err = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) 	if (req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) 		ceph_mdsc_put_request(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) 	kfree(last_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) 	dout("get_snap_name %p ino %llx.%llx err=%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) 	     child, ceph_vinop(inode), err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) static int ceph_get_name(struct dentry *parent, char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) 			 struct dentry *child)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) 	struct ceph_mds_client *mdsc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) 	struct ceph_mds_request *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) 	struct inode *inode = d_inode(child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) 	if (ceph_snap(inode) != CEPH_NOSNAP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) 		return __get_snap_name(parent, name, child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) 	mdsc = ceph_inode_to_client(inode)->mdsc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) 	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) 				       USE_ANY_MDS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) 	if (IS_ERR(req))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) 		return PTR_ERR(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) 	inode_lock(d_inode(parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) 	req->r_inode = inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) 	ihold(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) 	req->r_ino2 = ceph_vino(d_inode(parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) 	req->r_parent = d_inode(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) 	set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) 	req->r_num_caps = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) 	err = ceph_mdsc_do_request(mdsc, NULL, req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) 	inode_unlock(d_inode(parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) 	if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) 		struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) 		memcpy(name, rinfo->dname, rinfo->dname_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) 		name[rinfo->dname_len] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) 		dout("get_name %p ino %llx.%llx name %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) 		     child, ceph_vinop(inode), name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) 		dout("get_name %p ino %llx.%llx err %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) 		     child, ceph_vinop(inode), err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) 	ceph_mdsc_put_request(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) const struct export_operations ceph_export_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) 	.encode_fh = ceph_encode_fh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) 	.fh_to_dentry = ceph_fh_to_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) 	.fh_to_parent = ceph_fh_to_parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) 	.get_parent = ceph_get_parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) 	.get_name = ceph_get_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) };