NeilBrown | a55370a | 2005-06-23 22:03:52 -0700 | [diff] [blame] | 1 | /* |
NeilBrown | a55370a | 2005-06-23 22:03:52 -0700 | [diff] [blame] | 2 | * Copyright (c) 2004 The Regents of the University of Michigan. |
Jeff Layton | f3f8014 | 2012-03-21 09:52:07 -0400 | [diff] [blame] | 3 | * Copyright (c) 2012 Jeff Layton <jlayton@redhat.com> |
NeilBrown | a55370a | 2005-06-23 22:03:52 -0700 | [diff] [blame] | 4 | * All rights reserved. |
| 5 | * |
| 6 | * Andy Adamson <andros@citi.umich.edu> |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * 3. Neither the name of the University nor the names of its |
| 18 | * contributors may be used to endorse or promote products derived |
| 19 | * from this software without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 24 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| 28 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 29 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 30 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 31 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 32 | * |
| 33 | */ |
| 34 | |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 35 | #include <linux/file.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 36 | #include <linux/slab.h> |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 37 | #include <linux/namei.h> |
NeilBrown | a55370a | 2005-06-23 22:03:52 -0700 | [diff] [blame] | 38 | #include <linux/crypto.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 39 | #include <linux/sched.h> |
Jeff Layton | f3f8014 | 2012-03-21 09:52:07 -0400 | [diff] [blame] | 40 | #include <linux/fs.h> |
Jeff Layton | 813fd32 | 2012-03-21 09:52:08 -0400 | [diff] [blame] | 41 | #include <linux/module.h> |
Jeff Layton | f3f8014 | 2012-03-21 09:52:07 -0400 | [diff] [blame] | 42 | #include <net/net_namespace.h> |
| 43 | #include <linux/sunrpc/rpc_pipe_fs.h> |
| 44 | #include <linux/sunrpc/clnt.h> |
| 45 | #include <linux/nfsd/cld.h> |
Boaz Harrosh | 9a74af2 | 2009-12-03 20:30:56 +0200 | [diff] [blame] | 46 | |
| 47 | #include "nfsd.h" |
| 48 | #include "state.h" |
J. Bruce Fields | 0a3adad | 2009-11-04 18:12:35 -0500 | [diff] [blame] | 49 | #include "vfs.h" |
Jeff Layton | f3f8014 | 2012-03-21 09:52:07 -0400 | [diff] [blame] | 50 | #include "netns.h" |
NeilBrown | a55370a | 2005-06-23 22:03:52 -0700 | [diff] [blame] | 51 | |
| 52 | #define NFSDDBG_FACILITY NFSDDBG_PROC |
| 53 | |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 54 | /* Declarations */ |
| 55 | struct nfsd4_client_tracking_ops { |
| 56 | int (*init)(struct net *); |
| 57 | void (*exit)(struct net *); |
| 58 | void (*create)(struct nfs4_client *); |
| 59 | void (*remove)(struct nfs4_client *); |
| 60 | int (*check)(struct nfs4_client *); |
| 61 | void (*grace_done)(struct net *, time_t); |
| 62 | }; |
| 63 | |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 64 | /* Globals */ |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 65 | static struct file *rec_file; |
J. Bruce Fields | 48483bf | 2011-08-26 20:40:28 -0400 | [diff] [blame] | 66 | static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery"; |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 67 | static struct nfsd4_client_tracking_ops *client_tracking_ops; |
Jeff Layton | 0ce0c2b | 2012-11-12 15:00:55 -0500 | [diff] [blame] | 68 | static bool in_grace; |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 69 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 70 | static int |
| 71 | nfs4_save_creds(const struct cred **original_creds) |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 72 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 73 | struct cred *new; |
| 74 | |
| 75 | new = prepare_creds(); |
| 76 | if (!new) |
| 77 | return -ENOMEM; |
| 78 | |
| 79 | new->fsuid = 0; |
| 80 | new->fsgid = 0; |
| 81 | *original_creds = override_creds(new); |
| 82 | put_cred(new); |
| 83 | return 0; |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 84 | } |
| 85 | |
| 86 | static void |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 87 | nfs4_reset_creds(const struct cred *original) |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 88 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 89 | revert_creds(original); |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 90 | } |
| 91 | |
NeilBrown | a55370a | 2005-06-23 22:03:52 -0700 | [diff] [blame] | 92 | static void |
| 93 | md5_to_hex(char *out, char *md5) |
| 94 | { |
| 95 | int i; |
| 96 | |
| 97 | for (i=0; i<16; i++) { |
| 98 | unsigned char c = md5[i]; |
| 99 | |
| 100 | *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1); |
| 101 | *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1); |
| 102 | } |
| 103 | *out = '\0'; |
| 104 | } |
| 105 | |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 106 | static int |
| 107 | nfs4_make_rec_clidname(char *dname, const struct xdr_netobj *clname) |
NeilBrown | a55370a | 2005-06-23 22:03:52 -0700 | [diff] [blame] | 108 | { |
| 109 | struct xdr_netobj cksum; |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 110 | struct hash_desc desc; |
Jens Axboe | 60c74f8 | 2007-10-22 19:43:30 +0200 | [diff] [blame] | 111 | struct scatterlist sg; |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 112 | int status; |
NeilBrown | a55370a | 2005-06-23 22:03:52 -0700 | [diff] [blame] | 113 | |
| 114 | dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n", |
| 115 | clname->len, clname->data); |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 116 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
| 117 | desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC); |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 118 | if (IS_ERR(desc.tfm)) { |
| 119 | status = PTR_ERR(desc.tfm); |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 120 | goto out_no_tfm; |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 121 | } |
| 122 | |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 123 | cksum.len = crypto_hash_digestsize(desc.tfm); |
NeilBrown | a55370a | 2005-06-23 22:03:52 -0700 | [diff] [blame] | 124 | cksum.data = kmalloc(cksum.len, GFP_KERNEL); |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 125 | if (cksum.data == NULL) { |
| 126 | status = -ENOMEM; |
NeilBrown | a55370a | 2005-06-23 22:03:52 -0700 | [diff] [blame] | 127 | goto out; |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 128 | } |
NeilBrown | a55370a | 2005-06-23 22:03:52 -0700 | [diff] [blame] | 129 | |
Jens Axboe | 60c74f8 | 2007-10-22 19:43:30 +0200 | [diff] [blame] | 130 | sg_init_one(&sg, clname->data, clname->len); |
NeilBrown | a55370a | 2005-06-23 22:03:52 -0700 | [diff] [blame] | 131 | |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 132 | status = crypto_hash_digest(&desc, &sg, sg.length, cksum.data); |
| 133 | if (status) |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 134 | goto out; |
NeilBrown | a55370a | 2005-06-23 22:03:52 -0700 | [diff] [blame] | 135 | |
| 136 | md5_to_hex(dname, cksum.data); |
| 137 | |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 138 | status = 0; |
NeilBrown | a55370a | 2005-06-23 22:03:52 -0700 | [diff] [blame] | 139 | out: |
Krishna Kumar | 2bd9e7b | 2008-10-20 11:47:09 +0530 | [diff] [blame] | 140 | kfree(cksum.data); |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 141 | crypto_free_hash(desc.tfm); |
| 142 | out_no_tfm: |
NeilBrown | a55370a | 2005-06-23 22:03:52 -0700 | [diff] [blame] | 143 | return status; |
| 144 | } |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 145 | |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 146 | /* |
| 147 | * If we had an error generating the recdir name for the legacy tracker |
| 148 | * then warn the admin. If the error doesn't appear to be transient, |
| 149 | * then disable recovery tracking. |
| 150 | */ |
| 151 | static void |
| 152 | legacy_recdir_name_error(int error) |
| 153 | { |
| 154 | printk(KERN_ERR "NFSD: unable to generate recoverydir " |
| 155 | "name (%d).\n", error); |
| 156 | |
| 157 | /* |
| 158 | * if the algorithm just doesn't exist, then disable the recovery |
| 159 | * tracker altogether. The crypto libs will generally return this if |
| 160 | * FIPS is enabled as well. |
| 161 | */ |
| 162 | if (error == -ENOENT) { |
| 163 | printk(KERN_ERR "NFSD: disabling legacy clientid tracking. " |
| 164 | "Reboot recovery will not function correctly!\n"); |
| 165 | |
| 166 | /* the argument is ignored by the legacy exit function */ |
| 167 | nfsd4_client_tracking_exit(NULL); |
| 168 | } |
| 169 | } |
| 170 | |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 171 | static void |
| 172 | nfsd4_create_clid_dir(struct nfs4_client *clp) |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 173 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 174 | const struct cred *original_cred; |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 175 | char dname[HEXDIR_LEN]; |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 176 | struct dentry *dir, *dentry; |
Jeff Layton | 0ce0c2b | 2012-11-12 15:00:55 -0500 | [diff] [blame] | 177 | struct nfs4_client_reclaim *crp; |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 178 | int status; |
| 179 | |
| 180 | dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname); |
| 181 | |
Jeff Layton | a52d726 | 2012-03-21 09:52:02 -0400 | [diff] [blame] | 182 | if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
J. Bruce Fields | 7a6ef8c | 2012-01-05 15:38:41 -0500 | [diff] [blame] | 183 | return; |
J. Bruce Fields | b854889 | 2012-01-02 17:49:12 -0500 | [diff] [blame] | 184 | if (!rec_file) |
J. Bruce Fields | 7a6ef8c | 2012-01-05 15:38:41 -0500 | [diff] [blame] | 185 | return; |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 186 | |
| 187 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
| 188 | if (status) |
| 189 | return legacy_recdir_name_error(status); |
| 190 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 191 | status = nfs4_save_creds(&original_cred); |
| 192 | if (status < 0) |
J. Bruce Fields | 7a6ef8c | 2012-01-05 15:38:41 -0500 | [diff] [blame] | 193 | return; |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 194 | |
Jan Kara | 4a55c10 | 2012-06-12 16:20:33 +0200 | [diff] [blame] | 195 | status = mnt_want_write_file(rec_file); |
| 196 | if (status) |
| 197 | return; |
| 198 | |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 199 | dir = rec_file->f_path.dentry; |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 200 | /* lock the parent */ |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 201 | mutex_lock(&dir->d_inode->i_mutex); |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 202 | |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 203 | dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1); |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 204 | if (IS_ERR(dentry)) { |
| 205 | status = PTR_ERR(dentry); |
| 206 | goto out_unlock; |
| 207 | } |
Boaz Harrosh | 6577aac | 2011-08-12 17:30:12 -0700 | [diff] [blame] | 208 | if (dentry->d_inode) |
J. Bruce Fields | aec3968 | 2012-01-02 17:30:05 -0500 | [diff] [blame] | 209 | /* |
| 210 | * In the 4.1 case, where we're called from |
| 211 | * reclaim_complete(), records from the previous reboot |
| 212 | * may still be left, so this is OK. |
| 213 | * |
| 214 | * In the 4.0 case, we should never get here; but we may |
| 215 | * as well be forgiving and just succeed silently. |
| 216 | */ |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 217 | goto out_put; |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 218 | status = vfs_mkdir(dir->d_inode, dentry, S_IRWXU); |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 219 | out_put: |
| 220 | dput(dentry); |
| 221 | out_unlock: |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 222 | mutex_unlock(&dir->d_inode->i_mutex); |
Jeff Layton | 0ce0c2b | 2012-11-12 15:00:55 -0500 | [diff] [blame] | 223 | if (status == 0) { |
| 224 | if (in_grace) { |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 225 | crp = nfs4_client_to_reclaim(dname); |
Jeff Layton | 0ce0c2b | 2012-11-12 15:00:55 -0500 | [diff] [blame] | 226 | if (crp) |
| 227 | crp->cr_clp = clp; |
| 228 | } |
Christoph Hellwig | 8018ab0 | 2010-03-22 17:32:25 +0100 | [diff] [blame] | 229 | vfs_fsync(rec_file, 0); |
Jeff Layton | 0ce0c2b | 2012-11-12 15:00:55 -0500 | [diff] [blame] | 230 | } else { |
Boaz Harrosh | 6577aac | 2011-08-12 17:30:12 -0700 | [diff] [blame] | 231 | printk(KERN_ERR "NFSD: failed to write recovery record" |
| 232 | " (err %d); please check that %s exists" |
| 233 | " and is writeable", status, |
| 234 | user_recovery_dirname); |
Jeff Layton | 0ce0c2b | 2012-11-12 15:00:55 -0500 | [diff] [blame] | 235 | } |
Jan Kara | 4a55c10 | 2012-06-12 16:20:33 +0200 | [diff] [blame] | 236 | mnt_drop_write_file(rec_file); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 237 | nfs4_reset_creds(original_cred); |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 238 | } |
| 239 | |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 240 | typedef int (recdir_func)(struct dentry *, struct dentry *); |
| 241 | |
J. Bruce Fields | 05f4f67 | 2009-03-13 16:02:59 -0400 | [diff] [blame] | 242 | struct name_list { |
| 243 | char name[HEXDIR_LEN]; |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 244 | struct list_head list; |
| 245 | }; |
| 246 | |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 247 | static int |
J. Bruce Fields | 05f4f67 | 2009-03-13 16:02:59 -0400 | [diff] [blame] | 248 | nfsd4_build_namelist(void *arg, const char *name, int namlen, |
David Howells | afefdbb | 2006-10-03 01:13:46 -0700 | [diff] [blame] | 249 | loff_t offset, u64 ino, unsigned int d_type) |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 250 | { |
J. Bruce Fields | 05f4f67 | 2009-03-13 16:02:59 -0400 | [diff] [blame] | 251 | struct list_head *names = arg; |
| 252 | struct name_list *entry; |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 253 | |
J. Bruce Fields | 05f4f67 | 2009-03-13 16:02:59 -0400 | [diff] [blame] | 254 | if (namlen != HEXDIR_LEN - 1) |
Al Viro | b37ad28 | 2006-10-19 23:28:59 -0700 | [diff] [blame] | 255 | return 0; |
J. Bruce Fields | 05f4f67 | 2009-03-13 16:02:59 -0400 | [diff] [blame] | 256 | entry = kmalloc(sizeof(struct name_list), GFP_KERNEL); |
| 257 | if (entry == NULL) |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 258 | return -ENOMEM; |
J. Bruce Fields | 05f4f67 | 2009-03-13 16:02:59 -0400 | [diff] [blame] | 259 | memcpy(entry->name, name, HEXDIR_LEN - 1); |
| 260 | entry->name[HEXDIR_LEN - 1] = '\0'; |
| 261 | list_add(&entry->list, names); |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 262 | return 0; |
| 263 | } |
| 264 | |
| 265 | static int |
Al Viro | 5b4b299 | 2011-07-07 18:43:21 -0400 | [diff] [blame] | 266 | nfsd4_list_rec_dir(recdir_func *f) |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 267 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 268 | const struct cred *original_cred; |
Al Viro | 5b4b299 | 2011-07-07 18:43:21 -0400 | [diff] [blame] | 269 | struct dentry *dir = rec_file->f_path.dentry; |
J. Bruce Fields | 05f4f67 | 2009-03-13 16:02:59 -0400 | [diff] [blame] | 270 | LIST_HEAD(names); |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 271 | int status; |
| 272 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 273 | status = nfs4_save_creds(&original_cred); |
| 274 | if (status < 0) |
| 275 | return status; |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 276 | |
Al Viro | 5b4b299 | 2011-07-07 18:43:21 -0400 | [diff] [blame] | 277 | status = vfs_llseek(rec_file, 0, SEEK_SET); |
| 278 | if (status < 0) { |
| 279 | nfs4_reset_creds(original_cred); |
| 280 | return status; |
| 281 | } |
| 282 | |
| 283 | status = vfs_readdir(rec_file, nfsd4_build_namelist, &names); |
J. Bruce Fields | 8daed1e | 2009-05-11 16:10:19 -0400 | [diff] [blame] | 284 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); |
J. Bruce Fields | 05f4f67 | 2009-03-13 16:02:59 -0400 | [diff] [blame] | 285 | while (!list_empty(&names)) { |
Al Viro | 5b4b299 | 2011-07-07 18:43:21 -0400 | [diff] [blame] | 286 | struct name_list *entry; |
J. Bruce Fields | 05f4f67 | 2009-03-13 16:02:59 -0400 | [diff] [blame] | 287 | entry = list_entry(names.next, struct name_list, list); |
Al Viro | 5b4b299 | 2011-07-07 18:43:21 -0400 | [diff] [blame] | 288 | if (!status) { |
| 289 | struct dentry *dentry; |
| 290 | dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1); |
| 291 | if (IS_ERR(dentry)) { |
| 292 | status = PTR_ERR(dentry); |
| 293 | break; |
| 294 | } |
| 295 | status = f(dir, dentry); |
| 296 | dput(dentry); |
J. Bruce Fields | 05f4f67 | 2009-03-13 16:02:59 -0400 | [diff] [blame] | 297 | } |
J. Bruce Fields | 05f4f67 | 2009-03-13 16:02:59 -0400 | [diff] [blame] | 298 | list_del(&entry->list); |
| 299 | kfree(entry); |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 300 | } |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 301 | mutex_unlock(&dir->d_inode->i_mutex); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 302 | nfs4_reset_creds(original_cred); |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 303 | return status; |
| 304 | } |
| 305 | |
| 306 | static int |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 307 | nfsd4_unlink_clid_dir(char *name, int namlen) |
| 308 | { |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 309 | struct dentry *dir, *dentry; |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 310 | int status; |
| 311 | |
| 312 | dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name); |
| 313 | |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 314 | dir = rec_file->f_path.dentry; |
| 315 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); |
| 316 | dentry = lookup_one_len(name, dir, namlen); |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 317 | if (IS_ERR(dentry)) { |
| 318 | status = PTR_ERR(dentry); |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 319 | goto out_unlock; |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 320 | } |
| 321 | status = -ENOENT; |
| 322 | if (!dentry->d_inode) |
| 323 | goto out; |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 324 | status = vfs_rmdir(dir->d_inode, dentry); |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 325 | out: |
| 326 | dput(dentry); |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 327 | out_unlock: |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 328 | mutex_unlock(&dir->d_inode->i_mutex); |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 329 | return status; |
| 330 | } |
| 331 | |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 332 | static void |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 333 | nfsd4_remove_clid_dir(struct nfs4_client *clp) |
| 334 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 335 | const struct cred *original_cred; |
Jeff Layton | 0ce0c2b | 2012-11-12 15:00:55 -0500 | [diff] [blame] | 336 | struct nfs4_client_reclaim *crp; |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 337 | char dname[HEXDIR_LEN]; |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 338 | int status; |
| 339 | |
Jeff Layton | a52d726 | 2012-03-21 09:52:02 -0400 | [diff] [blame] | 340 | if (!rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 341 | return; |
| 342 | |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 343 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
| 344 | if (status) |
| 345 | return legacy_recdir_name_error(status); |
| 346 | |
Al Viro | a561be7 | 2011-11-23 11:57:51 -0500 | [diff] [blame] | 347 | status = mnt_want_write_file(rec_file); |
Dave Hansen | 0622753 | 2008-02-15 14:37:34 -0800 | [diff] [blame] | 348 | if (status) |
| 349 | goto out; |
Jeff Layton | a52d726 | 2012-03-21 09:52:02 -0400 | [diff] [blame] | 350 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 351 | |
| 352 | status = nfs4_save_creds(&original_cred); |
| 353 | if (status < 0) |
Jeff Layton | 698d8d8 | 2012-11-09 15:31:53 -0500 | [diff] [blame] | 354 | goto out_drop_write; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 355 | |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 356 | status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 357 | nfs4_reset_creds(original_cred); |
Jeff Layton | 0ce0c2b | 2012-11-12 15:00:55 -0500 | [diff] [blame] | 358 | if (status == 0) { |
Christoph Hellwig | 8018ab0 | 2010-03-22 17:32:25 +0100 | [diff] [blame] | 359 | vfs_fsync(rec_file, 0); |
Jeff Layton | 0ce0c2b | 2012-11-12 15:00:55 -0500 | [diff] [blame] | 360 | if (in_grace) { |
| 361 | /* remove reclaim record */ |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 362 | crp = nfsd4_find_reclaim_client(dname); |
Jeff Layton | 0ce0c2b | 2012-11-12 15:00:55 -0500 | [diff] [blame] | 363 | if (crp) |
| 364 | nfs4_remove_reclaim_record(crp); |
| 365 | } |
| 366 | } |
Jeff Layton | 698d8d8 | 2012-11-09 15:31:53 -0500 | [diff] [blame] | 367 | out_drop_write: |
Al Viro | 2a79f17 | 2011-12-09 08:06:57 -0500 | [diff] [blame] | 368 | mnt_drop_write_file(rec_file); |
Dave Hansen | 0622753 | 2008-02-15 14:37:34 -0800 | [diff] [blame] | 369 | out: |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 370 | if (status) |
| 371 | printk("NFSD: Failed to remove expired client state directory" |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 372 | " %.*s\n", HEXDIR_LEN, dname); |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 373 | } |
| 374 | |
| 375 | static int |
| 376 | purge_old(struct dentry *parent, struct dentry *child) |
| 377 | { |
| 378 | int status; |
| 379 | |
Jeff Layton | a0af710 | 2012-11-09 15:06:38 -0500 | [diff] [blame] | 380 | if (nfs4_has_reclaimed_state(child->d_name.name)) |
Al Viro | b37ad28 | 2006-10-19 23:28:59 -0700 | [diff] [blame] | 381 | return 0; |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 382 | |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 383 | status = vfs_rmdir(parent->d_inode, child); |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 384 | if (status) |
| 385 | printk("failed to remove client recovery directory %s\n", |
| 386 | child->d_name.name); |
| 387 | /* Keep trying, success or failure: */ |
Al Viro | b37ad28 | 2006-10-19 23:28:59 -0700 | [diff] [blame] | 388 | return 0; |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 389 | } |
| 390 | |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 391 | static void |
| 392 | nfsd4_recdir_purge_old(struct net *net, time_t boot_time) |
| 393 | { |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 394 | int status; |
| 395 | |
Jeff Layton | 0ce0c2b | 2012-11-12 15:00:55 -0500 | [diff] [blame] | 396 | in_grace = false; |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 397 | if (!rec_file) |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 398 | return; |
Al Viro | a561be7 | 2011-11-23 11:57:51 -0500 | [diff] [blame] | 399 | status = mnt_want_write_file(rec_file); |
Dave Hansen | 0622753 | 2008-02-15 14:37:34 -0800 | [diff] [blame] | 400 | if (status) |
| 401 | goto out; |
Al Viro | 5b4b299 | 2011-07-07 18:43:21 -0400 | [diff] [blame] | 402 | status = nfsd4_list_rec_dir(purge_old); |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 403 | if (status == 0) |
Christoph Hellwig | 8018ab0 | 2010-03-22 17:32:25 +0100 | [diff] [blame] | 404 | vfs_fsync(rec_file, 0); |
Al Viro | 2a79f17 | 2011-12-09 08:06:57 -0500 | [diff] [blame] | 405 | mnt_drop_write_file(rec_file); |
Dave Hansen | 0622753 | 2008-02-15 14:37:34 -0800 | [diff] [blame] | 406 | out: |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 407 | if (status) |
| 408 | printk("nfsd4: failed to purge old clients from recovery" |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 409 | " directory %s\n", rec_file->f_path.dentry->d_name.name); |
NeilBrown | c7b9a45 | 2005-06-23 22:04:30 -0700 | [diff] [blame] | 410 | } |
| 411 | |
| 412 | static int |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 413 | load_recdir(struct dentry *parent, struct dentry *child) |
| 414 | { |
| 415 | if (child->d_name.len != HEXDIR_LEN - 1) { |
| 416 | printk("nfsd4: illegal name %s in recovery directory\n", |
| 417 | child->d_name.name); |
| 418 | /* Keep trying; maybe the others are OK: */ |
Al Viro | b37ad28 | 2006-10-19 23:28:59 -0700 | [diff] [blame] | 419 | return 0; |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 420 | } |
| 421 | nfs4_client_to_reclaim(child->d_name.name); |
Al Viro | b37ad28 | 2006-10-19 23:28:59 -0700 | [diff] [blame] | 422 | return 0; |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 423 | } |
| 424 | |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 425 | static int |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 426 | nfsd4_recdir_load(void) { |
| 427 | int status; |
| 428 | |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 429 | if (!rec_file) |
| 430 | return 0; |
| 431 | |
Al Viro | 5b4b299 | 2011-07-07 18:43:21 -0400 | [diff] [blame] | 432 | status = nfsd4_list_rec_dir(load_recdir); |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 433 | if (status) |
| 434 | printk("nfsd4: failed loading clients from recovery" |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 435 | " directory %s\n", rec_file->f_path.dentry->d_name.name); |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 436 | return status; |
| 437 | } |
| 438 | |
| 439 | /* |
| 440 | * Hold reference to the recovery directory. |
| 441 | */ |
| 442 | |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 443 | static int |
| 444 | nfsd4_init_recdir(void) |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 445 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 446 | const struct cred *original_cred; |
| 447 | int status; |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 448 | |
| 449 | printk("NFSD: Using %s as the NFSv4 state recovery directory\n", |
J. Bruce Fields | 48483bf | 2011-08-26 20:40:28 -0400 | [diff] [blame] | 450 | user_recovery_dirname); |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 451 | |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 452 | BUG_ON(rec_file); |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 453 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 454 | status = nfs4_save_creds(&original_cred); |
| 455 | if (status < 0) { |
| 456 | printk("NFSD: Unable to change credentials to find recovery" |
| 457 | " directory: error %d\n", |
| 458 | status); |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 459 | return status; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 460 | } |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 461 | |
J. Bruce Fields | 48483bf | 2011-08-26 20:40:28 -0400 | [diff] [blame] | 462 | rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0); |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 463 | if (IS_ERR(rec_file)) { |
J. Bruce Fields | c2642ab | 2006-01-18 17:43:29 -0800 | [diff] [blame] | 464 | printk("NFSD: unable to find recovery directory %s\n", |
J. Bruce Fields | 48483bf | 2011-08-26 20:40:28 -0400 | [diff] [blame] | 465 | user_recovery_dirname); |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 466 | status = PTR_ERR(rec_file); |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 467 | rec_file = NULL; |
| 468 | } |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 469 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 470 | nfs4_reset_creds(original_cred); |
Jeff Layton | 0ce0c2b | 2012-11-12 15:00:55 -0500 | [diff] [blame] | 471 | if (!status) |
| 472 | in_grace = true; |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 473 | return status; |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 474 | } |
| 475 | |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 476 | static int |
| 477 | nfsd4_load_reboot_recovery_data(struct net *net) |
| 478 | { |
| 479 | int status; |
| 480 | |
Jeff Layton | cc27e0d | 2012-03-21 09:52:09 -0400 | [diff] [blame] | 481 | /* XXX: The legacy code won't work in a container */ |
| 482 | if (net != &init_net) { |
| 483 | WARN(1, KERN_ERR "NFSD: attempt to initialize legacy client " |
| 484 | "tracking in a container!\n"); |
| 485 | return -EINVAL; |
| 486 | } |
| 487 | |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 488 | nfs4_lock_state(); |
| 489 | status = nfsd4_init_recdir(); |
| 490 | if (!status) |
| 491 | status = nfsd4_recdir_load(); |
| 492 | nfs4_unlock_state(); |
| 493 | if (status) |
| 494 | printk(KERN_ERR "NFSD: Failure reading reboot recovery data\n"); |
| 495 | return status; |
| 496 | } |
| 497 | |
| 498 | static void |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 499 | nfsd4_shutdown_recdir(void) |
| 500 | { |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 501 | if (!rec_file) |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 502 | return; |
Christoph Hellwig | e970a57 | 2010-03-22 17:32:14 +0100 | [diff] [blame] | 503 | fput(rec_file); |
| 504 | rec_file = NULL; |
NeilBrown | 190e4fb | 2005-06-23 22:04:25 -0700 | [diff] [blame] | 505 | } |
J. Bruce Fields | 48483bf | 2011-08-26 20:40:28 -0400 | [diff] [blame] | 506 | |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 507 | static void |
| 508 | nfsd4_legacy_tracking_exit(struct net *net) |
| 509 | { |
| 510 | nfs4_release_reclaim(); |
| 511 | nfsd4_shutdown_recdir(); |
| 512 | } |
| 513 | |
J. Bruce Fields | 48483bf | 2011-08-26 20:40:28 -0400 | [diff] [blame] | 514 | /* |
| 515 | * Change the NFSv4 recovery directory to recdir. |
| 516 | */ |
| 517 | int |
| 518 | nfs4_reset_recoverydir(char *recdir) |
| 519 | { |
| 520 | int status; |
| 521 | struct path path; |
| 522 | |
| 523 | status = kern_path(recdir, LOOKUP_FOLLOW, &path); |
| 524 | if (status) |
| 525 | return status; |
| 526 | status = -ENOTDIR; |
| 527 | if (S_ISDIR(path.dentry->d_inode->i_mode)) { |
| 528 | strcpy(user_recovery_dirname, recdir); |
| 529 | status = 0; |
| 530 | } |
| 531 | path_put(&path); |
| 532 | return status; |
| 533 | } |
| 534 | |
| 535 | char * |
| 536 | nfs4_recoverydir(void) |
| 537 | { |
| 538 | return user_recovery_dirname; |
| 539 | } |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 540 | |
| 541 | static int |
| 542 | nfsd4_check_legacy_client(struct nfs4_client *clp) |
| 543 | { |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 544 | int status; |
| 545 | char dname[HEXDIR_LEN]; |
Jeff Layton | 0ce0c2b | 2012-11-12 15:00:55 -0500 | [diff] [blame] | 546 | struct nfs4_client_reclaim *crp; |
| 547 | |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 548 | /* did we already find that this client is stable? */ |
| 549 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
| 550 | return 0; |
| 551 | |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 552 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
| 553 | if (status) { |
| 554 | legacy_recdir_name_error(status); |
| 555 | return status; |
| 556 | } |
| 557 | |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 558 | /* look for it in the reclaim hashtable otherwise */ |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 559 | crp = nfsd4_find_reclaim_client(dname); |
Jeff Layton | 0ce0c2b | 2012-11-12 15:00:55 -0500 | [diff] [blame] | 560 | if (crp) { |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 561 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
Jeff Layton | 0ce0c2b | 2012-11-12 15:00:55 -0500 | [diff] [blame] | 562 | crp->cr_clp = clp; |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 563 | return 0; |
| 564 | } |
| 565 | |
| 566 | return -ENOENT; |
| 567 | } |
| 568 | |
| 569 | static struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = { |
| 570 | .init = nfsd4_load_reboot_recovery_data, |
| 571 | .exit = nfsd4_legacy_tracking_exit, |
| 572 | .create = nfsd4_create_clid_dir, |
| 573 | .remove = nfsd4_remove_clid_dir, |
| 574 | .check = nfsd4_check_legacy_client, |
| 575 | .grace_done = nfsd4_recdir_purge_old, |
| 576 | }; |
| 577 | |
Jeff Layton | f3f8014 | 2012-03-21 09:52:07 -0400 | [diff] [blame] | 578 | /* Globals */ |
| 579 | #define NFSD_PIPE_DIR "nfsd" |
| 580 | #define NFSD_CLD_PIPE "cld" |
| 581 | |
| 582 | /* per-net-ns structure for holding cld upcall info */ |
| 583 | struct cld_net { |
| 584 | struct rpc_pipe *cn_pipe; |
| 585 | spinlock_t cn_lock; |
| 586 | struct list_head cn_list; |
| 587 | unsigned int cn_xid; |
| 588 | }; |
| 589 | |
| 590 | struct cld_upcall { |
| 591 | struct list_head cu_list; |
| 592 | struct cld_net *cu_net; |
| 593 | struct task_struct *cu_task; |
| 594 | struct cld_msg cu_msg; |
| 595 | }; |
| 596 | |
| 597 | static int |
| 598 | __cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg) |
| 599 | { |
| 600 | int ret; |
| 601 | struct rpc_pipe_msg msg; |
| 602 | |
| 603 | memset(&msg, 0, sizeof(msg)); |
| 604 | msg.data = cmsg; |
| 605 | msg.len = sizeof(*cmsg); |
| 606 | |
| 607 | /* |
| 608 | * Set task state before we queue the upcall. That prevents |
| 609 | * wake_up_process in the downcall from racing with schedule. |
| 610 | */ |
| 611 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 612 | ret = rpc_queue_upcall(pipe, &msg); |
| 613 | if (ret < 0) { |
| 614 | set_current_state(TASK_RUNNING); |
| 615 | goto out; |
| 616 | } |
| 617 | |
| 618 | schedule(); |
| 619 | set_current_state(TASK_RUNNING); |
| 620 | |
| 621 | if (msg.errno < 0) |
| 622 | ret = msg.errno; |
| 623 | out: |
| 624 | return ret; |
| 625 | } |
| 626 | |
| 627 | static int |
| 628 | cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg) |
| 629 | { |
| 630 | int ret; |
| 631 | |
| 632 | /* |
| 633 | * -EAGAIN occurs when pipe is closed and reopened while there are |
| 634 | * upcalls queued. |
| 635 | */ |
| 636 | do { |
| 637 | ret = __cld_pipe_upcall(pipe, cmsg); |
| 638 | } while (ret == -EAGAIN); |
| 639 | |
| 640 | return ret; |
| 641 | } |
| 642 | |
| 643 | static ssize_t |
| 644 | cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) |
| 645 | { |
| 646 | struct cld_upcall *tmp, *cup; |
J. Bruce Fields | bc1b542 | 2012-04-25 16:58:05 -0400 | [diff] [blame] | 647 | struct cld_msg __user *cmsg = (struct cld_msg __user *)src; |
Jeff Layton | f3f8014 | 2012-03-21 09:52:07 -0400 | [diff] [blame] | 648 | uint32_t xid; |
| 649 | struct nfsd_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info, |
| 650 | nfsd_net_id); |
| 651 | struct cld_net *cn = nn->cld_net; |
| 652 | |
| 653 | if (mlen != sizeof(*cmsg)) { |
Randy Dunlap | 8a7dc4b | 2012-04-30 12:25:31 -0700 | [diff] [blame] | 654 | dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen, |
Jeff Layton | f3f8014 | 2012-03-21 09:52:07 -0400 | [diff] [blame] | 655 | sizeof(*cmsg)); |
| 656 | return -EINVAL; |
| 657 | } |
| 658 | |
| 659 | /* copy just the xid so we can try to find that */ |
| 660 | if (copy_from_user(&xid, &cmsg->cm_xid, sizeof(xid)) != 0) { |
| 661 | dprintk("%s: error when copying xid from userspace", __func__); |
| 662 | return -EFAULT; |
| 663 | } |
| 664 | |
| 665 | /* walk the list and find corresponding xid */ |
| 666 | cup = NULL; |
| 667 | spin_lock(&cn->cn_lock); |
| 668 | list_for_each_entry(tmp, &cn->cn_list, cu_list) { |
| 669 | if (get_unaligned(&tmp->cu_msg.cm_xid) == xid) { |
| 670 | cup = tmp; |
| 671 | list_del_init(&cup->cu_list); |
| 672 | break; |
| 673 | } |
| 674 | } |
| 675 | spin_unlock(&cn->cn_lock); |
| 676 | |
| 677 | /* couldn't find upcall? */ |
| 678 | if (!cup) { |
Jeff Layton | 21f72c9 | 2012-03-28 07:36:01 -0400 | [diff] [blame] | 679 | dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid); |
Jeff Layton | f3f8014 | 2012-03-21 09:52:07 -0400 | [diff] [blame] | 680 | return -EINVAL; |
| 681 | } |
| 682 | |
| 683 | if (copy_from_user(&cup->cu_msg, src, mlen) != 0) |
| 684 | return -EFAULT; |
| 685 | |
| 686 | wake_up_process(cup->cu_task); |
| 687 | return mlen; |
| 688 | } |
| 689 | |
| 690 | static void |
| 691 | cld_pipe_destroy_msg(struct rpc_pipe_msg *msg) |
| 692 | { |
| 693 | struct cld_msg *cmsg = msg->data; |
| 694 | struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, |
| 695 | cu_msg); |
| 696 | |
| 697 | /* errno >= 0 means we got a downcall */ |
| 698 | if (msg->errno >= 0) |
| 699 | return; |
| 700 | |
| 701 | wake_up_process(cup->cu_task); |
| 702 | } |
| 703 | |
| 704 | static const struct rpc_pipe_ops cld_upcall_ops = { |
| 705 | .upcall = rpc_pipe_generic_upcall, |
| 706 | .downcall = cld_pipe_downcall, |
| 707 | .destroy_msg = cld_pipe_destroy_msg, |
| 708 | }; |
| 709 | |
| 710 | static struct dentry * |
| 711 | nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe) |
| 712 | { |
| 713 | struct dentry *dir, *dentry; |
| 714 | |
| 715 | dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR); |
| 716 | if (dir == NULL) |
| 717 | return ERR_PTR(-ENOENT); |
| 718 | dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe); |
| 719 | dput(dir); |
| 720 | return dentry; |
| 721 | } |
| 722 | |
| 723 | static void |
| 724 | nfsd4_cld_unregister_sb(struct rpc_pipe *pipe) |
| 725 | { |
| 726 | if (pipe->dentry) |
| 727 | rpc_unlink(pipe->dentry); |
| 728 | } |
| 729 | |
| 730 | static struct dentry * |
| 731 | nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe) |
| 732 | { |
| 733 | struct super_block *sb; |
| 734 | struct dentry *dentry; |
| 735 | |
| 736 | sb = rpc_get_sb_net(net); |
| 737 | if (!sb) |
| 738 | return NULL; |
| 739 | dentry = nfsd4_cld_register_sb(sb, pipe); |
| 740 | rpc_put_sb_net(net); |
| 741 | return dentry; |
| 742 | } |
| 743 | |
| 744 | static void |
| 745 | nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe) |
| 746 | { |
| 747 | struct super_block *sb; |
| 748 | |
| 749 | sb = rpc_get_sb_net(net); |
| 750 | if (sb) { |
| 751 | nfsd4_cld_unregister_sb(pipe); |
| 752 | rpc_put_sb_net(net); |
| 753 | } |
| 754 | } |
| 755 | |
| 756 | /* Initialize rpc_pipefs pipe for communication with client tracking daemon */ |
| 757 | static int |
| 758 | nfsd4_init_cld_pipe(struct net *net) |
| 759 | { |
| 760 | int ret; |
| 761 | struct dentry *dentry; |
| 762 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 763 | struct cld_net *cn; |
| 764 | |
| 765 | if (nn->cld_net) |
| 766 | return 0; |
| 767 | |
| 768 | cn = kzalloc(sizeof(*cn), GFP_KERNEL); |
| 769 | if (!cn) { |
| 770 | ret = -ENOMEM; |
| 771 | goto err; |
| 772 | } |
| 773 | |
| 774 | cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); |
| 775 | if (IS_ERR(cn->cn_pipe)) { |
| 776 | ret = PTR_ERR(cn->cn_pipe); |
| 777 | goto err; |
| 778 | } |
| 779 | spin_lock_init(&cn->cn_lock); |
| 780 | INIT_LIST_HEAD(&cn->cn_list); |
| 781 | |
| 782 | dentry = nfsd4_cld_register_net(net, cn->cn_pipe); |
| 783 | if (IS_ERR(dentry)) { |
| 784 | ret = PTR_ERR(dentry); |
| 785 | goto err_destroy_data; |
| 786 | } |
| 787 | |
| 788 | cn->cn_pipe->dentry = dentry; |
| 789 | nn->cld_net = cn; |
| 790 | return 0; |
| 791 | |
| 792 | err_destroy_data: |
| 793 | rpc_destroy_pipe_data(cn->cn_pipe); |
| 794 | err: |
| 795 | kfree(cn); |
| 796 | printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n", |
| 797 | ret); |
| 798 | return ret; |
| 799 | } |
| 800 | |
| 801 | static void |
| 802 | nfsd4_remove_cld_pipe(struct net *net) |
| 803 | { |
| 804 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 805 | struct cld_net *cn = nn->cld_net; |
| 806 | |
| 807 | nfsd4_cld_unregister_net(net, cn->cn_pipe); |
| 808 | rpc_destroy_pipe_data(cn->cn_pipe); |
| 809 | kfree(nn->cld_net); |
| 810 | nn->cld_net = NULL; |
| 811 | } |
| 812 | |
| 813 | static struct cld_upcall * |
| 814 | alloc_cld_upcall(struct cld_net *cn) |
| 815 | { |
| 816 | struct cld_upcall *new, *tmp; |
| 817 | |
| 818 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
| 819 | if (!new) |
| 820 | return new; |
| 821 | |
| 822 | /* FIXME: hard cap on number in flight? */ |
| 823 | restart_search: |
| 824 | spin_lock(&cn->cn_lock); |
| 825 | list_for_each_entry(tmp, &cn->cn_list, cu_list) { |
| 826 | if (tmp->cu_msg.cm_xid == cn->cn_xid) { |
| 827 | cn->cn_xid++; |
| 828 | spin_unlock(&cn->cn_lock); |
| 829 | goto restart_search; |
| 830 | } |
| 831 | } |
| 832 | new->cu_task = current; |
| 833 | new->cu_msg.cm_vers = CLD_UPCALL_VERSION; |
| 834 | put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid); |
| 835 | new->cu_net = cn; |
| 836 | list_add(&new->cu_list, &cn->cn_list); |
| 837 | spin_unlock(&cn->cn_lock); |
| 838 | |
| 839 | dprintk("%s: allocated xid %u\n", __func__, new->cu_msg.cm_xid); |
| 840 | |
| 841 | return new; |
| 842 | } |
| 843 | |
| 844 | static void |
| 845 | free_cld_upcall(struct cld_upcall *victim) |
| 846 | { |
| 847 | struct cld_net *cn = victim->cu_net; |
| 848 | |
| 849 | spin_lock(&cn->cn_lock); |
| 850 | list_del(&victim->cu_list); |
| 851 | spin_unlock(&cn->cn_lock); |
| 852 | kfree(victim); |
| 853 | } |
| 854 | |
| 855 | /* Ask daemon to create a new record */ |
| 856 | static void |
| 857 | nfsd4_cld_create(struct nfs4_client *clp) |
| 858 | { |
| 859 | int ret; |
| 860 | struct cld_upcall *cup; |
| 861 | /* FIXME: determine net from clp */ |
| 862 | struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id); |
| 863 | struct cld_net *cn = nn->cld_net; |
| 864 | |
| 865 | /* Don't upcall if it's already stored */ |
| 866 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
| 867 | return; |
| 868 | |
| 869 | cup = alloc_cld_upcall(cn); |
| 870 | if (!cup) { |
| 871 | ret = -ENOMEM; |
| 872 | goto out_err; |
| 873 | } |
| 874 | |
| 875 | cup->cu_msg.cm_cmd = Cld_Create; |
| 876 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; |
| 877 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, |
| 878 | clp->cl_name.len); |
| 879 | |
| 880 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); |
| 881 | if (!ret) { |
| 882 | ret = cup->cu_msg.cm_status; |
| 883 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
| 884 | } |
| 885 | |
| 886 | free_cld_upcall(cup); |
| 887 | out_err: |
| 888 | if (ret) |
| 889 | printk(KERN_ERR "NFSD: Unable to create client " |
| 890 | "record on stable storage: %d\n", ret); |
| 891 | } |
| 892 | |
| 893 | /* Ask daemon to create a new record */ |
| 894 | static void |
| 895 | nfsd4_cld_remove(struct nfs4_client *clp) |
| 896 | { |
| 897 | int ret; |
| 898 | struct cld_upcall *cup; |
| 899 | /* FIXME: determine net from clp */ |
| 900 | struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id); |
| 901 | struct cld_net *cn = nn->cld_net; |
| 902 | |
| 903 | /* Don't upcall if it's already removed */ |
| 904 | if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
| 905 | return; |
| 906 | |
| 907 | cup = alloc_cld_upcall(cn); |
| 908 | if (!cup) { |
| 909 | ret = -ENOMEM; |
| 910 | goto out_err; |
| 911 | } |
| 912 | |
| 913 | cup->cu_msg.cm_cmd = Cld_Remove; |
| 914 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; |
| 915 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, |
| 916 | clp->cl_name.len); |
| 917 | |
| 918 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); |
| 919 | if (!ret) { |
| 920 | ret = cup->cu_msg.cm_status; |
| 921 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
| 922 | } |
| 923 | |
| 924 | free_cld_upcall(cup); |
| 925 | out_err: |
| 926 | if (ret) |
| 927 | printk(KERN_ERR "NFSD: Unable to remove client " |
| 928 | "record from stable storage: %d\n", ret); |
| 929 | } |
| 930 | |
| 931 | /* Check for presence of a record, and update its timestamp */ |
| 932 | static int |
| 933 | nfsd4_cld_check(struct nfs4_client *clp) |
| 934 | { |
| 935 | int ret; |
| 936 | struct cld_upcall *cup; |
| 937 | /* FIXME: determine net from clp */ |
| 938 | struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id); |
| 939 | struct cld_net *cn = nn->cld_net; |
| 940 | |
| 941 | /* Don't upcall if one was already stored during this grace pd */ |
| 942 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
| 943 | return 0; |
| 944 | |
| 945 | cup = alloc_cld_upcall(cn); |
| 946 | if (!cup) { |
| 947 | printk(KERN_ERR "NFSD: Unable to check client record on " |
| 948 | "stable storage: %d\n", -ENOMEM); |
| 949 | return -ENOMEM; |
| 950 | } |
| 951 | |
| 952 | cup->cu_msg.cm_cmd = Cld_Check; |
| 953 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; |
| 954 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, |
| 955 | clp->cl_name.len); |
| 956 | |
| 957 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); |
| 958 | if (!ret) { |
| 959 | ret = cup->cu_msg.cm_status; |
| 960 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
| 961 | } |
| 962 | |
| 963 | free_cld_upcall(cup); |
| 964 | return ret; |
| 965 | } |
| 966 | |
| 967 | static void |
| 968 | nfsd4_cld_grace_done(struct net *net, time_t boot_time) |
| 969 | { |
| 970 | int ret; |
| 971 | struct cld_upcall *cup; |
| 972 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 973 | struct cld_net *cn = nn->cld_net; |
| 974 | |
| 975 | cup = alloc_cld_upcall(cn); |
| 976 | if (!cup) { |
| 977 | ret = -ENOMEM; |
| 978 | goto out_err; |
| 979 | } |
| 980 | |
| 981 | cup->cu_msg.cm_cmd = Cld_GraceDone; |
| 982 | cup->cu_msg.cm_u.cm_gracetime = (int64_t)boot_time; |
| 983 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); |
| 984 | if (!ret) |
| 985 | ret = cup->cu_msg.cm_status; |
| 986 | |
| 987 | free_cld_upcall(cup); |
| 988 | out_err: |
| 989 | if (ret) |
| 990 | printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret); |
| 991 | } |
| 992 | |
| 993 | static struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = { |
| 994 | .init = nfsd4_init_cld_pipe, |
| 995 | .exit = nfsd4_remove_cld_pipe, |
| 996 | .create = nfsd4_cld_create, |
| 997 | .remove = nfsd4_cld_remove, |
| 998 | .check = nfsd4_cld_check, |
| 999 | .grace_done = nfsd4_cld_grace_done, |
| 1000 | }; |
| 1001 | |
Jeff Layton | 2873d21 | 2012-11-12 15:00:48 -0500 | [diff] [blame] | 1002 | /* upcall via usermodehelper */ |
| 1003 | static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack"; |
| 1004 | module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog), |
| 1005 | S_IRUGO|S_IWUSR); |
| 1006 | MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program"); |
| 1007 | |
Jeff Layton | f3aa7e24 | 2012-11-12 15:00:50 -0500 | [diff] [blame] | 1008 | static bool cltrack_legacy_disable; |
| 1009 | module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR); |
| 1010 | MODULE_PARM_DESC(cltrack_legacy_disable, |
| 1011 | "Disable legacy recoverydir conversion. Default: false"); |
| 1012 | |
| 1013 | #define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR=" |
| 1014 | #define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR=" |
| 1015 | |
| 1016 | static char * |
| 1017 | nfsd4_cltrack_legacy_topdir(void) |
Jeff Layton | 2873d21 | 2012-11-12 15:00:48 -0500 | [diff] [blame] | 1018 | { |
Jeff Layton | f3aa7e24 | 2012-11-12 15:00:50 -0500 | [diff] [blame] | 1019 | int copied; |
| 1020 | size_t len; |
| 1021 | char *result; |
| 1022 | |
| 1023 | if (cltrack_legacy_disable) |
| 1024 | return NULL; |
| 1025 | |
| 1026 | len = strlen(LEGACY_TOPDIR_ENV_PREFIX) + |
| 1027 | strlen(nfs4_recoverydir()) + 1; |
| 1028 | |
| 1029 | result = kmalloc(len, GFP_KERNEL); |
| 1030 | if (!result) |
| 1031 | return result; |
| 1032 | |
| 1033 | copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s", |
| 1034 | nfs4_recoverydir()); |
| 1035 | if (copied >= len) { |
| 1036 | /* just return nothing if output was truncated */ |
| 1037 | kfree(result); |
| 1038 | return NULL; |
| 1039 | } |
| 1040 | |
| 1041 | return result; |
| 1042 | } |
| 1043 | |
| 1044 | static char * |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 1045 | nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name) |
Jeff Layton | f3aa7e24 | 2012-11-12 15:00:50 -0500 | [diff] [blame] | 1046 | { |
| 1047 | int copied; |
| 1048 | size_t len; |
| 1049 | char *result; |
| 1050 | |
| 1051 | if (cltrack_legacy_disable) |
| 1052 | return NULL; |
| 1053 | |
| 1054 | /* +1 is for '/' between "topdir" and "recdir" */ |
| 1055 | len = strlen(LEGACY_RECDIR_ENV_PREFIX) + |
| 1056 | strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN; |
| 1057 | |
| 1058 | result = kmalloc(len, GFP_KERNEL); |
| 1059 | if (!result) |
| 1060 | return result; |
| 1061 | |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 1062 | copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/", |
| 1063 | nfs4_recoverydir()); |
| 1064 | if (copied > (len - HEXDIR_LEN)) { |
| 1065 | /* just return nothing if output will be truncated */ |
| 1066 | kfree(result); |
| 1067 | return NULL; |
| 1068 | } |
| 1069 | |
| 1070 | copied = nfs4_make_rec_clidname(result + copied, name); |
| 1071 | if (copied) { |
Jeff Layton | f3aa7e24 | 2012-11-12 15:00:50 -0500 | [diff] [blame] | 1072 | kfree(result); |
| 1073 | return NULL; |
| 1074 | } |
| 1075 | |
| 1076 | return result; |
| 1077 | } |
| 1078 | |
| 1079 | static int |
| 1080 | nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *legacy) |
| 1081 | { |
| 1082 | char *envp[2]; |
Jeff Layton | 2873d21 | 2012-11-12 15:00:48 -0500 | [diff] [blame] | 1083 | char *argv[4]; |
| 1084 | int ret; |
| 1085 | |
| 1086 | if (unlikely(!cltrack_prog[0])) { |
| 1087 | dprintk("%s: cltrack_prog is disabled\n", __func__); |
| 1088 | return -EACCES; |
| 1089 | } |
| 1090 | |
| 1091 | dprintk("%s: cmd: %s\n", __func__, cmd); |
| 1092 | dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)"); |
Jeff Layton | f3aa7e24 | 2012-11-12 15:00:50 -0500 | [diff] [blame] | 1093 | dprintk("%s: legacy: %s\n", __func__, legacy ? legacy : "(null)"); |
| 1094 | |
| 1095 | envp[0] = legacy; |
| 1096 | envp[1] = NULL; |
Jeff Layton | 2873d21 | 2012-11-12 15:00:48 -0500 | [diff] [blame] | 1097 | |
| 1098 | argv[0] = (char *)cltrack_prog; |
| 1099 | argv[1] = cmd; |
| 1100 | argv[2] = arg; |
| 1101 | argv[3] = NULL; |
| 1102 | |
| 1103 | ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); |
| 1104 | /* |
| 1105 | * Disable the upcall mechanism if we're getting an ENOENT or EACCES |
| 1106 | * error. The admin can re-enable it on the fly by using sysfs |
| 1107 | * once the problem has been fixed. |
| 1108 | */ |
| 1109 | if (ret == -ENOENT || ret == -EACCES) { |
| 1110 | dprintk("NFSD: %s was not found or isn't executable (%d). " |
| 1111 | "Setting cltrack_prog to blank string!", |
| 1112 | cltrack_prog, ret); |
| 1113 | cltrack_prog[0] = '\0'; |
| 1114 | } |
| 1115 | dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret); |
| 1116 | |
| 1117 | return ret; |
| 1118 | } |
| 1119 | |
| 1120 | static char * |
| 1121 | bin_to_hex_dup(const unsigned char *src, int srclen) |
| 1122 | { |
| 1123 | int i; |
| 1124 | char *buf, *hex; |
| 1125 | |
| 1126 | /* +1 for terminating NULL */ |
| 1127 | buf = kmalloc((srclen * 2) + 1, GFP_KERNEL); |
| 1128 | if (!buf) |
| 1129 | return buf; |
| 1130 | |
| 1131 | hex = buf; |
| 1132 | for (i = 0; i < srclen; i++) { |
| 1133 | sprintf(hex, "%2.2x", *src++); |
| 1134 | hex += 2; |
| 1135 | } |
| 1136 | return buf; |
| 1137 | } |
| 1138 | |
| 1139 | static int |
| 1140 | nfsd4_umh_cltrack_init(struct net __attribute__((unused)) *net) |
| 1141 | { |
Jeff Layton | f3aa7e24 | 2012-11-12 15:00:50 -0500 | [diff] [blame] | 1142 | return nfsd4_umh_cltrack_upcall("init", NULL, NULL); |
Jeff Layton | 2873d21 | 2012-11-12 15:00:48 -0500 | [diff] [blame] | 1143 | } |
| 1144 | |
| 1145 | static void |
| 1146 | nfsd4_umh_cltrack_create(struct nfs4_client *clp) |
| 1147 | { |
| 1148 | char *hexid; |
| 1149 | |
| 1150 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); |
| 1151 | if (!hexid) { |
| 1152 | dprintk("%s: can't allocate memory for upcall!\n", __func__); |
| 1153 | return; |
| 1154 | } |
Jeff Layton | f3aa7e24 | 2012-11-12 15:00:50 -0500 | [diff] [blame] | 1155 | nfsd4_umh_cltrack_upcall("create", hexid, NULL); |
Jeff Layton | 2873d21 | 2012-11-12 15:00:48 -0500 | [diff] [blame] | 1156 | kfree(hexid); |
| 1157 | } |
| 1158 | |
| 1159 | static void |
| 1160 | nfsd4_umh_cltrack_remove(struct nfs4_client *clp) |
| 1161 | { |
| 1162 | char *hexid; |
| 1163 | |
| 1164 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); |
| 1165 | if (!hexid) { |
| 1166 | dprintk("%s: can't allocate memory for upcall!\n", __func__); |
| 1167 | return; |
| 1168 | } |
Jeff Layton | f3aa7e24 | 2012-11-12 15:00:50 -0500 | [diff] [blame] | 1169 | nfsd4_umh_cltrack_upcall("remove", hexid, NULL); |
Jeff Layton | 2873d21 | 2012-11-12 15:00:48 -0500 | [diff] [blame] | 1170 | kfree(hexid); |
| 1171 | } |
| 1172 | |
| 1173 | static int |
| 1174 | nfsd4_umh_cltrack_check(struct nfs4_client *clp) |
| 1175 | { |
| 1176 | int ret; |
Jeff Layton | f3aa7e24 | 2012-11-12 15:00:50 -0500 | [diff] [blame] | 1177 | char *hexid, *legacy; |
Jeff Layton | 2873d21 | 2012-11-12 15:00:48 -0500 | [diff] [blame] | 1178 | |
| 1179 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); |
| 1180 | if (!hexid) { |
| 1181 | dprintk("%s: can't allocate memory for upcall!\n", __func__); |
| 1182 | return -ENOMEM; |
| 1183 | } |
Jeff Layton | 2216d44 | 2012-11-12 15:00:57 -0500 | [diff] [blame^] | 1184 | legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name); |
Jeff Layton | f3aa7e24 | 2012-11-12 15:00:50 -0500 | [diff] [blame] | 1185 | ret = nfsd4_umh_cltrack_upcall("check", hexid, legacy); |
| 1186 | kfree(legacy); |
Jeff Layton | 2873d21 | 2012-11-12 15:00:48 -0500 | [diff] [blame] | 1187 | kfree(hexid); |
| 1188 | return ret; |
| 1189 | } |
| 1190 | |
| 1191 | static void |
| 1192 | nfsd4_umh_cltrack_grace_done(struct net __attribute__((unused)) *net, |
| 1193 | time_t boot_time) |
| 1194 | { |
Jeff Layton | f3aa7e24 | 2012-11-12 15:00:50 -0500 | [diff] [blame] | 1195 | char *legacy; |
Jeff Layton | 2873d21 | 2012-11-12 15:00:48 -0500 | [diff] [blame] | 1196 | char timestr[22]; /* FIXME: better way to determine max size? */ |
| 1197 | |
| 1198 | sprintf(timestr, "%ld", boot_time); |
Jeff Layton | f3aa7e24 | 2012-11-12 15:00:50 -0500 | [diff] [blame] | 1199 | legacy = nfsd4_cltrack_legacy_topdir(); |
| 1200 | nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy); |
| 1201 | kfree(legacy); |
Jeff Layton | 2873d21 | 2012-11-12 15:00:48 -0500 | [diff] [blame] | 1202 | } |
| 1203 | |
| 1204 | static struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = { |
| 1205 | .init = nfsd4_umh_cltrack_init, |
| 1206 | .exit = NULL, |
| 1207 | .create = nfsd4_umh_cltrack_create, |
| 1208 | .remove = nfsd4_umh_cltrack_remove, |
| 1209 | .check = nfsd4_umh_cltrack_check, |
| 1210 | .grace_done = nfsd4_umh_cltrack_grace_done, |
| 1211 | }; |
| 1212 | |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 1213 | int |
| 1214 | nfsd4_client_tracking_init(struct net *net) |
| 1215 | { |
| 1216 | int status; |
Jeff Layton | f3f8014 | 2012-03-21 09:52:07 -0400 | [diff] [blame] | 1217 | struct path path; |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 1218 | |
Jeff Layton | 2d77bf0 | 2012-11-12 15:00:49 -0500 | [diff] [blame] | 1219 | /* just run the init if it the method is already decided */ |
| 1220 | if (client_tracking_ops) |
| 1221 | goto do_init; |
| 1222 | |
| 1223 | /* |
| 1224 | * First, try a UMH upcall. It should succeed or fail quickly, so |
| 1225 | * there's little harm in trying that first. |
| 1226 | */ |
| 1227 | client_tracking_ops = &nfsd4_umh_tracking_ops; |
| 1228 | status = client_tracking_ops->init(net); |
| 1229 | if (!status) |
| 1230 | return status; |
| 1231 | |
| 1232 | /* |
| 1233 | * See if the recoverydir exists and is a directory. If it is, |
| 1234 | * then use the legacy ops. |
| 1235 | */ |
| 1236 | client_tracking_ops = &nfsd4_legacy_tracking_ops; |
| 1237 | status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path); |
| 1238 | if (!status) { |
| 1239 | status = S_ISDIR(path.dentry->d_inode->i_mode); |
| 1240 | path_put(&path); |
| 1241 | if (status) |
| 1242 | goto do_init; |
Jeff Layton | f3f8014 | 2012-03-21 09:52:07 -0400 | [diff] [blame] | 1243 | } |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 1244 | |
Jeff Layton | 2d77bf0 | 2012-11-12 15:00:49 -0500 | [diff] [blame] | 1245 | /* Finally, try to use nfsdcld */ |
| 1246 | client_tracking_ops = &nfsd4_cld_tracking_ops; |
Jeff Layton | 8b0554e | 2012-11-12 15:00:51 -0500 | [diff] [blame] | 1247 | printk(KERN_WARNING "NFSD: the nfsdcld client tracking upcall will be " |
| 1248 | "removed in 3.10. Please transition to using " |
| 1249 | "nfsdcltrack.\n"); |
Jeff Layton | 2d77bf0 | 2012-11-12 15:00:49 -0500 | [diff] [blame] | 1250 | do_init: |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 1251 | status = client_tracking_ops->init(net); |
| 1252 | if (status) { |
| 1253 | printk(KERN_WARNING "NFSD: Unable to initialize client " |
| 1254 | "recovery tracking! (%d)\n", status); |
| 1255 | client_tracking_ops = NULL; |
| 1256 | } |
| 1257 | return status; |
| 1258 | } |
| 1259 | |
| 1260 | void |
| 1261 | nfsd4_client_tracking_exit(struct net *net) |
| 1262 | { |
| 1263 | if (client_tracking_ops) { |
Jeff Layton | 2873d21 | 2012-11-12 15:00:48 -0500 | [diff] [blame] | 1264 | if (client_tracking_ops->exit) |
| 1265 | client_tracking_ops->exit(net); |
Jeff Layton | 2a4317c | 2012-03-21 16:42:43 -0400 | [diff] [blame] | 1266 | client_tracking_ops = NULL; |
| 1267 | } |
| 1268 | } |
| 1269 | |
| 1270 | void |
| 1271 | nfsd4_client_record_create(struct nfs4_client *clp) |
| 1272 | { |
| 1273 | if (client_tracking_ops) |
| 1274 | client_tracking_ops->create(clp); |
| 1275 | } |
| 1276 | |
| 1277 | void |
| 1278 | nfsd4_client_record_remove(struct nfs4_client *clp) |
| 1279 | { |
| 1280 | if (client_tracking_ops) |
| 1281 | client_tracking_ops->remove(clp); |
| 1282 | } |
| 1283 | |
| 1284 | int |
| 1285 | nfsd4_client_record_check(struct nfs4_client *clp) |
| 1286 | { |
| 1287 | if (client_tracking_ops) |
| 1288 | return client_tracking_ops->check(clp); |
| 1289 | |
| 1290 | return -EOPNOTSUPP; |
| 1291 | } |
| 1292 | |
| 1293 | void |
| 1294 | nfsd4_record_grace_done(struct net *net, time_t boot_time) |
| 1295 | { |
| 1296 | if (client_tracking_ops) |
| 1297 | client_tracking_ops->grace_done(net, boot_time); |
| 1298 | } |
Jeff Layton | 813fd32 | 2012-03-21 09:52:08 -0400 | [diff] [blame] | 1299 | |
| 1300 | static int |
| 1301 | rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr) |
| 1302 | { |
| 1303 | struct super_block *sb = ptr; |
| 1304 | struct net *net = sb->s_fs_info; |
| 1305 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 1306 | struct cld_net *cn = nn->cld_net; |
| 1307 | struct dentry *dentry; |
| 1308 | int ret = 0; |
| 1309 | |
| 1310 | if (!try_module_get(THIS_MODULE)) |
| 1311 | return 0; |
| 1312 | |
| 1313 | if (!cn) { |
| 1314 | module_put(THIS_MODULE); |
| 1315 | return 0; |
| 1316 | } |
| 1317 | |
| 1318 | switch (event) { |
| 1319 | case RPC_PIPEFS_MOUNT: |
| 1320 | dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe); |
| 1321 | if (IS_ERR(dentry)) { |
| 1322 | ret = PTR_ERR(dentry); |
| 1323 | break; |
| 1324 | } |
| 1325 | cn->cn_pipe->dentry = dentry; |
| 1326 | break; |
| 1327 | case RPC_PIPEFS_UMOUNT: |
| 1328 | if (cn->cn_pipe->dentry) |
| 1329 | nfsd4_cld_unregister_sb(cn->cn_pipe); |
| 1330 | break; |
| 1331 | default: |
| 1332 | ret = -ENOTSUPP; |
| 1333 | break; |
| 1334 | } |
| 1335 | module_put(THIS_MODULE); |
| 1336 | return ret; |
| 1337 | } |
| 1338 | |
J. Bruce Fields | 2355c59 | 2012-04-25 16:56:22 -0400 | [diff] [blame] | 1339 | static struct notifier_block nfsd4_cld_block = { |
Jeff Layton | 813fd32 | 2012-03-21 09:52:08 -0400 | [diff] [blame] | 1340 | .notifier_call = rpc_pipefs_event, |
| 1341 | }; |
Jeff Layton | 797a9d7 | 2012-03-29 07:52:49 -0400 | [diff] [blame] | 1342 | |
| 1343 | int |
| 1344 | register_cld_notifier(void) |
| 1345 | { |
| 1346 | return rpc_pipefs_notifier_register(&nfsd4_cld_block); |
| 1347 | } |
| 1348 | |
| 1349 | void |
| 1350 | unregister_cld_notifier(void) |
| 1351 | { |
| 1352 | rpc_pipefs_notifier_unregister(&nfsd4_cld_block); |
| 1353 | } |