Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/lockd/svcsubs.c |
| 3 | * |
| 4 | * Various support routines for the NLM server. |
| 5 | * |
| 6 | * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> |
| 7 | */ |
| 8 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/types.h> |
| 10 | #include <linux/string.h> |
| 11 | #include <linux/time.h> |
| 12 | #include <linux/in.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 13 | #include <linux/slab.h> |
Ingo Molnar | 353ab6e | 2006-03-26 01:37:12 -0800 | [diff] [blame] | 14 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/sunrpc/svc.h> |
| 16 | #include <linux/sunrpc/clnt.h> |
| 17 | #include <linux/nfsd/nfsfh.h> |
| 18 | #include <linux/nfsd/export.h> |
| 19 | #include <linux/lockd/lockd.h> |
| 20 | #include <linux/lockd/share.h> |
Wendy Cheng | 4373ea8 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 21 | #include <linux/module.h> |
| 22 | #include <linux/mount.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
| 24 | #define NLMDBG_FACILITY NLMDBG_SVCSUBS |
| 25 | |
| 26 | |
| 27 | /* |
| 28 | * Global file hash table |
| 29 | */ |
Olaf Kirch | 07ba806 | 2006-10-04 02:15:58 -0700 | [diff] [blame] | 30 | #define FILE_HASH_BITS 7 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #define FILE_NRHASH (1<<FILE_HASH_BITS) |
Olaf Kirch | 07ba806 | 2006-10-04 02:15:58 -0700 | [diff] [blame] | 32 | static struct hlist_head nlm_files[FILE_NRHASH]; |
Ingo Molnar | 353ab6e | 2006-03-26 01:37:12 -0800 | [diff] [blame] | 33 | static DEFINE_MUTEX(nlm_file_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
Chuck Lever | 0bbacc4 | 2005-11-01 16:53:32 -0500 | [diff] [blame] | 35 | #ifdef NFSD_DEBUG |
| 36 | static inline void nlm_debug_print_fh(char *msg, struct nfs_fh *f) |
| 37 | { |
| 38 | u32 *fhp = (u32*)f->data; |
| 39 | |
| 40 | /* print the first 32 bytes of the fh */ |
| 41 | dprintk("lockd: %s (%08x %08x %08x %08x %08x %08x %08x %08x)\n", |
| 42 | msg, fhp[0], fhp[1], fhp[2], fhp[3], |
| 43 | fhp[4], fhp[5], fhp[6], fhp[7]); |
| 44 | } |
| 45 | |
| 46 | static inline void nlm_debug_print_file(char *msg, struct nlm_file *file) |
| 47 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 48 | struct inode *inode = file_inode(file->f_file); |
Chuck Lever | 0bbacc4 | 2005-11-01 16:53:32 -0500 | [diff] [blame] | 49 | |
| 50 | dprintk("lockd: %s %s/%ld\n", |
| 51 | msg, inode->i_sb->s_id, inode->i_ino); |
| 52 | } |
| 53 | #else |
| 54 | static inline void nlm_debug_print_fh(char *msg, struct nfs_fh *f) |
| 55 | { |
| 56 | return; |
| 57 | } |
| 58 | |
| 59 | static inline void nlm_debug_print_file(char *msg, struct nlm_file *file) |
| 60 | { |
| 61 | return; |
| 62 | } |
| 63 | #endif |
| 64 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | static inline unsigned int file_hash(struct nfs_fh *f) |
| 66 | { |
| 67 | unsigned int tmp=0; |
| 68 | int i; |
| 69 | for (i=0; i<NFS2_FHSIZE;i++) |
| 70 | tmp += f->data[i]; |
| 71 | return tmp & (FILE_NRHASH - 1); |
| 72 | } |
| 73 | |
| 74 | /* |
| 75 | * Lookup file info. If it doesn't exist, create a file info struct |
| 76 | * and open a (VFS) file for the given inode. |
| 77 | * |
| 78 | * FIXME: |
| 79 | * Note that we open the file O_RDONLY even when creating write locks. |
| 80 | * This is not quite right, but for now, we assume the client performs |
| 81 | * the proper R/W checking. |
| 82 | */ |
Al Viro | 52921e0 | 2006-10-19 23:28:46 -0700 | [diff] [blame] | 83 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | nlm_lookup_file(struct svc_rqst *rqstp, struct nlm_file **result, |
| 85 | struct nfs_fh *f) |
| 86 | { |
Olaf Kirch | 07ba806 | 2006-10-04 02:15:58 -0700 | [diff] [blame] | 87 | struct hlist_node *pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | struct nlm_file *file; |
| 89 | unsigned int hash; |
Al Viro | 52921e0 | 2006-10-19 23:28:46 -0700 | [diff] [blame] | 90 | __be32 nfserr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
J. Bruce Fields | 50431d9 | 2007-08-31 17:09:33 -0400 | [diff] [blame] | 92 | nlm_debug_print_fh("nlm_lookup_file", f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
| 94 | hash = file_hash(f); |
| 95 | |
| 96 | /* Lock file table */ |
Ingo Molnar | 353ab6e | 2006-03-26 01:37:12 -0800 | [diff] [blame] | 97 | mutex_lock(&nlm_file_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
Olaf Kirch | 07ba806 | 2006-10-04 02:15:58 -0700 | [diff] [blame] | 99 | hlist_for_each_entry(file, pos, &nlm_files[hash], f_list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | if (!nfs_compare_fh(&file->f_handle, f)) |
| 101 | goto found; |
| 102 | |
Chuck Lever | 0bbacc4 | 2005-11-01 16:53:32 -0500 | [diff] [blame] | 103 | nlm_debug_print_fh("creating file for", f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
| 105 | nfserr = nlm_lck_denied_nolocks; |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 106 | file = kzalloc(sizeof(*file), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | if (!file) |
| 108 | goto out_unlock; |
| 109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | memcpy(&file->f_handle, f, sizeof(struct nfs_fh)); |
Neil Brown | 89e63ef | 2006-10-04 02:16:06 -0700 | [diff] [blame] | 111 | mutex_init(&file->f_mutex); |
Olaf Kirch | 07ba806 | 2006-10-04 02:15:58 -0700 | [diff] [blame] | 112 | INIT_HLIST_NODE(&file->f_list); |
Olaf Kirch | 68a2d76c | 2006-10-04 02:15:57 -0700 | [diff] [blame] | 113 | INIT_LIST_HEAD(&file->f_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | |
| 115 | /* Open the file. Note that this must not sleep for too long, else |
| 116 | * we would lock up lockd:-) So no NFS re-exports, folks. |
| 117 | * |
| 118 | * We have to make sure we have the right credential to open |
| 119 | * the file. |
| 120 | */ |
| 121 | if ((nfserr = nlmsvc_ops->fopen(rqstp, f, &file->f_file)) != 0) { |
Olaf Kirch | f0737a3 | 2006-10-04 02:15:54 -0700 | [diff] [blame] | 122 | dprintk("lockd: open failed (error %d)\n", nfserr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | goto out_free; |
| 124 | } |
| 125 | |
Olaf Kirch | 07ba806 | 2006-10-04 02:15:58 -0700 | [diff] [blame] | 126 | hlist_add_head(&file->f_list, &nlm_files[hash]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
| 128 | found: |
| 129 | dprintk("lockd: found file %p (count %d)\n", file, file->f_count); |
| 130 | *result = file; |
| 131 | file->f_count++; |
| 132 | nfserr = 0; |
| 133 | |
| 134 | out_unlock: |
Ingo Molnar | 353ab6e | 2006-03-26 01:37:12 -0800 | [diff] [blame] | 135 | mutex_unlock(&nlm_file_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | return nfserr; |
| 137 | |
| 138 | out_free: |
| 139 | kfree(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | goto out_unlock; |
| 141 | } |
| 142 | |
| 143 | /* |
| 144 | * Delete a file after having released all locks, blocks and shares |
| 145 | */ |
| 146 | static inline void |
| 147 | nlm_delete_file(struct nlm_file *file) |
| 148 | { |
Chuck Lever | 0bbacc4 | 2005-11-01 16:53:32 -0500 | [diff] [blame] | 149 | nlm_debug_print_file("closing file", file); |
Olaf Kirch | 07ba806 | 2006-10-04 02:15:58 -0700 | [diff] [blame] | 150 | if (!hlist_unhashed(&file->f_list)) { |
| 151 | hlist_del(&file->f_list); |
| 152 | nlmsvc_ops->fclose(file->f_file); |
| 153 | kfree(file); |
| 154 | } else { |
| 155 | printk(KERN_WARNING "lockd: attempt to release unknown file!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | /* |
| 160 | * Loop over all locks on the given file and perform the specified |
| 161 | * action. |
| 162 | */ |
| 163 | static int |
Olaf Kirch | f2af793 | 2006-10-04 02:15:59 -0700 | [diff] [blame] | 164 | nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file, |
| 165 | nlm_host_match_fn_t match) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | { |
| 167 | struct inode *inode = nlmsvc_file_inode(file); |
| 168 | struct file_lock *fl; |
| 169 | struct nlm_host *lockhost; |
| 170 | |
| 171 | again: |
| 172 | file->f_locks = 0; |
Arnd Bergmann | 763641d | 2010-10-26 22:55:40 +0200 | [diff] [blame] | 173 | lock_flocks(); /* protects i_flock list */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | for (fl = inode->i_flock; fl; fl = fl->fl_next) { |
J. Bruce Fields | 7117bf3 | 2006-03-20 13:44:26 -0500 | [diff] [blame] | 175 | if (fl->fl_lmops != &nlmsvc_lock_operations) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | continue; |
| 177 | |
| 178 | /* update current lock count */ |
| 179 | file->f_locks++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
Olaf Kirch | f2af793 | 2006-10-04 02:15:59 -0700 | [diff] [blame] | 181 | lockhost = (struct nlm_host *) fl->fl_owner; |
| 182 | if (match(lockhost, host)) { |
| 183 | struct file_lock lock = *fl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | |
Arnd Bergmann | 763641d | 2010-10-26 22:55:40 +0200 | [diff] [blame] | 185 | unlock_flocks(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | lock.fl_type = F_UNLCK; |
| 187 | lock.fl_start = 0; |
| 188 | lock.fl_end = OFFSET_MAX; |
Marc Eshel | 1a8322b | 2006-11-28 16:27:06 -0500 | [diff] [blame] | 189 | if (vfs_lock_file(file->f_file, F_SETLK, &lock, NULL) < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | printk("lockd: unlock failure in %s:%d\n", |
| 191 | __FILE__, __LINE__); |
| 192 | return 1; |
| 193 | } |
| 194 | goto again; |
| 195 | } |
| 196 | } |
Arnd Bergmann | 763641d | 2010-10-26 22:55:40 +0200 | [diff] [blame] | 197 | unlock_flocks(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | |
| 199 | return 0; |
| 200 | } |
| 201 | |
Wendy Cheng | 17efa37 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 202 | static int |
| 203 | nlmsvc_always_match(void *dummy1, struct nlm_host *dummy2) |
| 204 | { |
| 205 | return 1; |
| 206 | } |
| 207 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | /* |
Olaf Kirch | f2af793 | 2006-10-04 02:15:59 -0700 | [diff] [blame] | 209 | * Inspect a single file |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | */ |
| 211 | static inline int |
Olaf Kirch | f2af793 | 2006-10-04 02:15:59 -0700 | [diff] [blame] | 212 | nlm_inspect_file(struct nlm_host *host, struct nlm_file *file, nlm_host_match_fn_t match) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | { |
Olaf Kirch | f2af793 | 2006-10-04 02:15:59 -0700 | [diff] [blame] | 214 | nlmsvc_traverse_blocks(host, file, match); |
| 215 | nlmsvc_traverse_shares(host, file, match); |
| 216 | return nlm_traverse_locks(host, file, match); |
| 217 | } |
| 218 | |
| 219 | /* |
| 220 | * Quick check whether there are still any locks, blocks or |
| 221 | * shares on a given file. |
| 222 | */ |
| 223 | static inline int |
| 224 | nlm_file_inuse(struct nlm_file *file) |
| 225 | { |
| 226 | struct inode *inode = nlmsvc_file_inode(file); |
| 227 | struct file_lock *fl; |
| 228 | |
| 229 | if (file->f_count || !list_empty(&file->f_blocks) || file->f_shares) |
| 230 | return 1; |
| 231 | |
Arnd Bergmann | 763641d | 2010-10-26 22:55:40 +0200 | [diff] [blame] | 232 | lock_flocks(); |
Olaf Kirch | f2af793 | 2006-10-04 02:15:59 -0700 | [diff] [blame] | 233 | for (fl = inode->i_flock; fl; fl = fl->fl_next) { |
Arnd Bergmann | 763641d | 2010-10-26 22:55:40 +0200 | [diff] [blame] | 234 | if (fl->fl_lmops == &nlmsvc_lock_operations) { |
| 235 | unlock_flocks(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | return 1; |
Arnd Bergmann | 763641d | 2010-10-26 22:55:40 +0200 | [diff] [blame] | 237 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | } |
Arnd Bergmann | 763641d | 2010-10-26 22:55:40 +0200 | [diff] [blame] | 239 | unlock_flocks(); |
Olaf Kirch | f2af793 | 2006-10-04 02:15:59 -0700 | [diff] [blame] | 240 | file->f_locks = 0; |
| 241 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | } |
| 243 | |
| 244 | /* |
| 245 | * Loop over all files in the file table. |
| 246 | */ |
| 247 | static int |
Wendy Cheng | 17efa37 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 248 | nlm_traverse_files(void *data, nlm_host_match_fn_t match, |
| 249 | int (*is_failover_file)(void *data, struct nlm_file *file)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | { |
Olaf Kirch | 07ba806 | 2006-10-04 02:15:58 -0700 | [diff] [blame] | 251 | struct hlist_node *pos, *next; |
| 252 | struct nlm_file *file; |
Trond Myklebust | 01df9c5 | 2006-08-10 11:58:57 -0400 | [diff] [blame] | 253 | int i, ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
Ingo Molnar | 353ab6e | 2006-03-26 01:37:12 -0800 | [diff] [blame] | 255 | mutex_lock(&nlm_file_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | for (i = 0; i < FILE_NRHASH; i++) { |
Olaf Kirch | 07ba806 | 2006-10-04 02:15:58 -0700 | [diff] [blame] | 257 | hlist_for_each_entry_safe(file, pos, next, &nlm_files[i], f_list) { |
Wendy Cheng | 17efa37 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 258 | if (is_failover_file && !is_failover_file(data, file)) |
| 259 | continue; |
Trond Myklebust | 01df9c5 | 2006-08-10 11:58:57 -0400 | [diff] [blame] | 260 | file->f_count++; |
| 261 | mutex_unlock(&nlm_file_mutex); |
| 262 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | /* Traverse locks, blocks and shares of this file |
| 264 | * and update file->f_locks count */ |
Wendy Cheng | 4373ea8 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 265 | if (nlm_inspect_file(data, file, match)) |
Trond Myklebust | 01df9c5 | 2006-08-10 11:58:57 -0400 | [diff] [blame] | 266 | ret = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
Trond Myklebust | 01df9c5 | 2006-08-10 11:58:57 -0400 | [diff] [blame] | 268 | mutex_lock(&nlm_file_mutex); |
| 269 | file->f_count--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | /* No more references to this file. Let go of it. */ |
Olaf Kirch | 68a2d76c | 2006-10-04 02:15:57 -0700 | [diff] [blame] | 271 | if (list_empty(&file->f_blocks) && !file->f_locks |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | && !file->f_shares && !file->f_count) { |
Olaf Kirch | 07ba806 | 2006-10-04 02:15:58 -0700 | [diff] [blame] | 273 | hlist_del(&file->f_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | nlmsvc_ops->fclose(file->f_file); |
| 275 | kfree(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | } |
| 277 | } |
| 278 | } |
Ingo Molnar | 353ab6e | 2006-03-26 01:37:12 -0800 | [diff] [blame] | 279 | mutex_unlock(&nlm_file_mutex); |
Trond Myklebust | 01df9c5 | 2006-08-10 11:58:57 -0400 | [diff] [blame] | 280 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | } |
| 282 | |
| 283 | /* |
| 284 | * Release file. If there are no more remote locks on this file, |
| 285 | * close it and free the handle. |
| 286 | * |
| 287 | * Note that we can't do proper reference counting without major |
| 288 | * contortions because the code in fs/locks.c creates, deletes and |
| 289 | * splits locks without notification. Our only way is to walk the |
| 290 | * entire lock list each time we remove a lock. |
| 291 | */ |
| 292 | void |
| 293 | nlm_release_file(struct nlm_file *file) |
| 294 | { |
| 295 | dprintk("lockd: nlm_release_file(%p, ct = %d)\n", |
| 296 | file, file->f_count); |
| 297 | |
| 298 | /* Lock file table */ |
Ingo Molnar | 353ab6e | 2006-03-26 01:37:12 -0800 | [diff] [blame] | 299 | mutex_lock(&nlm_file_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | |
| 301 | /* If there are no more locks etc, delete the file */ |
Olaf Kirch | f2af793 | 2006-10-04 02:15:59 -0700 | [diff] [blame] | 302 | if (--file->f_count == 0 && !nlm_file_inuse(file)) |
| 303 | nlm_delete_file(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
Ingo Molnar | 353ab6e | 2006-03-26 01:37:12 -0800 | [diff] [blame] | 305 | mutex_unlock(&nlm_file_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | } |
| 307 | |
| 308 | /* |
Olaf Kirch | f2af793 | 2006-10-04 02:15:59 -0700 | [diff] [blame] | 309 | * Helpers function for resource traversal |
| 310 | * |
| 311 | * nlmsvc_mark_host: |
Stanislav Kinsbursky | b26411f | 2012-07-25 16:55:54 +0400 | [diff] [blame] | 312 | * used by the garbage collector; simply sets h_inuse only for those |
| 313 | * hosts, which passed network check. |
Olaf Kirch | f2af793 | 2006-10-04 02:15:59 -0700 | [diff] [blame] | 314 | * Always returns 0. |
| 315 | * |
| 316 | * nlmsvc_same_host: |
| 317 | * returns 1 iff the two hosts match. Used to release |
| 318 | * all resources bound to a specific host. |
| 319 | * |
| 320 | * nlmsvc_is_client: |
| 321 | * returns 1 iff the host is a client. |
| 322 | * Used by nlmsvc_invalidate_all |
| 323 | */ |
Stanislav Kinsbursky | b26411f | 2012-07-25 16:55:54 +0400 | [diff] [blame] | 324 | |
Olaf Kirch | f2af793 | 2006-10-04 02:15:59 -0700 | [diff] [blame] | 325 | static int |
Stanislav Kinsbursky | b26411f | 2012-07-25 16:55:54 +0400 | [diff] [blame] | 326 | nlmsvc_mark_host(void *data, struct nlm_host *hint) |
Olaf Kirch | f2af793 | 2006-10-04 02:15:59 -0700 | [diff] [blame] | 327 | { |
Wendy Cheng | 4373ea8 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 328 | struct nlm_host *host = data; |
| 329 | |
Stanislav Kinsbursky | b26411f | 2012-07-25 16:55:54 +0400 | [diff] [blame] | 330 | if ((hint->net == NULL) || |
| 331 | (host->net == hint->net)) |
| 332 | host->h_inuse = 1; |
Olaf Kirch | f2af793 | 2006-10-04 02:15:59 -0700 | [diff] [blame] | 333 | return 0; |
| 334 | } |
| 335 | |
| 336 | static int |
Wendy Cheng | 4373ea8 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 337 | nlmsvc_same_host(void *data, struct nlm_host *other) |
Olaf Kirch | f2af793 | 2006-10-04 02:15:59 -0700 | [diff] [blame] | 338 | { |
Wendy Cheng | 4373ea8 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 339 | struct nlm_host *host = data; |
| 340 | |
Olaf Kirch | f2af793 | 2006-10-04 02:15:59 -0700 | [diff] [blame] | 341 | return host == other; |
| 342 | } |
| 343 | |
| 344 | static int |
Wendy Cheng | 4373ea8 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 345 | nlmsvc_is_client(void *data, struct nlm_host *dummy) |
Olaf Kirch | f2af793 | 2006-10-04 02:15:59 -0700 | [diff] [blame] | 346 | { |
Wendy Cheng | 4373ea8 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 347 | struct nlm_host *host = data; |
| 348 | |
NeilBrown | 4481d10 | 2006-10-17 00:10:17 -0700 | [diff] [blame] | 349 | if (host->h_server) { |
| 350 | /* we are destroying locks even though the client |
| 351 | * hasn't asked us too, so don't unmonitor the |
| 352 | * client |
| 353 | */ |
| 354 | if (host->h_nsmhandle) |
| 355 | host->h_nsmhandle->sm_sticky = 1; |
| 356 | return 1; |
| 357 | } else |
| 358 | return 0; |
Olaf Kirch | f2af793 | 2006-10-04 02:15:59 -0700 | [diff] [blame] | 359 | } |
| 360 | |
| 361 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | * Mark all hosts that still hold resources |
| 363 | */ |
| 364 | void |
Stanislav Kinsbursky | b26411f | 2012-07-25 16:55:54 +0400 | [diff] [blame] | 365 | nlmsvc_mark_resources(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | { |
Stanislav Kinsbursky | b26411f | 2012-07-25 16:55:54 +0400 | [diff] [blame] | 367 | struct nlm_host hint; |
| 368 | |
| 369 | dprintk("lockd: nlmsvc_mark_resources for net %p\n", net); |
| 370 | hint.net = net; |
| 371 | nlm_traverse_files(&hint, nlmsvc_mark_host, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | } |
| 373 | |
| 374 | /* |
| 375 | * Release all resources held by the given client |
| 376 | */ |
| 377 | void |
| 378 | nlmsvc_free_host_resources(struct nlm_host *host) |
| 379 | { |
| 380 | dprintk("lockd: nlmsvc_free_host_resources\n"); |
| 381 | |
Wendy Cheng | 17efa37 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 382 | if (nlm_traverse_files(host, nlmsvc_same_host, NULL)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | printk(KERN_WARNING |
Olaf Kirch | f0737a3 | 2006-10-04 02:15:54 -0700 | [diff] [blame] | 384 | "lockd: couldn't remove all locks held by %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | host->h_name); |
Olaf Kirch | f0737a3 | 2006-10-04 02:15:54 -0700 | [diff] [blame] | 386 | BUG(); |
| 387 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | } |
| 389 | |
Chuck Lever | 367c8c7 | 2008-06-30 18:58:14 -0400 | [diff] [blame] | 390 | /** |
| 391 | * nlmsvc_invalidate_all - remove all locks held for clients |
| 392 | * |
| 393 | * Release all locks held by NFS clients. |
| 394 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | */ |
| 396 | void |
| 397 | nlmsvc_invalidate_all(void) |
| 398 | { |
Chuck Lever | 367c8c7 | 2008-06-30 18:58:14 -0400 | [diff] [blame] | 399 | /* |
Olaf Kirch | f2af793 | 2006-10-04 02:15:59 -0700 | [diff] [blame] | 400 | * Previously, the code would call |
| 401 | * nlmsvc_free_host_resources for each client in |
| 402 | * turn, which is about as inefficient as it gets. |
| 403 | * Now we just do it once in nlm_traverse_files. |
| 404 | */ |
Wendy Cheng | 17efa37 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 405 | nlm_traverse_files(NULL, nlmsvc_is_client, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | } |
Wendy Cheng | 4373ea8 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 407 | |
| 408 | static int |
Wendy Cheng | 17efa37 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 409 | nlmsvc_match_sb(void *datap, struct nlm_file *file) |
| 410 | { |
| 411 | struct super_block *sb = datap; |
| 412 | |
Al Viro | d8c9584 | 2011-12-07 18:16:57 -0500 | [diff] [blame] | 413 | return sb == file->f_file->f_path.dentry->d_sb; |
Wendy Cheng | 17efa37 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 414 | } |
| 415 | |
Chuck Lever | 367c8c7 | 2008-06-30 18:58:14 -0400 | [diff] [blame] | 416 | /** |
| 417 | * nlmsvc_unlock_all_by_sb - release locks held on this file system |
| 418 | * @sb: super block |
| 419 | * |
| 420 | * Release all locks held by clients accessing this file system. |
| 421 | */ |
Wendy Cheng | 17efa37 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 422 | int |
| 423 | nlmsvc_unlock_all_by_sb(struct super_block *sb) |
| 424 | { |
| 425 | int ret; |
| 426 | |
| 427 | ret = nlm_traverse_files(sb, nlmsvc_always_match, nlmsvc_match_sb); |
| 428 | return ret ? -EIO : 0; |
| 429 | } |
| 430 | EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_sb); |
| 431 | |
| 432 | static int |
Wendy Cheng | 4373ea8 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 433 | nlmsvc_match_ip(void *datap, struct nlm_host *host) |
| 434 | { |
Jeff Layton | 4516fc0 | 2009-08-14 12:57:54 -0400 | [diff] [blame] | 435 | return rpc_cmp_addr(nlm_srcaddr(host), datap); |
Wendy Cheng | 4373ea8 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 436 | } |
| 437 | |
Chuck Lever | 367c8c7 | 2008-06-30 18:58:14 -0400 | [diff] [blame] | 438 | /** |
| 439 | * nlmsvc_unlock_all_by_ip - release local locks by IP address |
| 440 | * @server_addr: server's IP address as seen by clients |
| 441 | * |
| 442 | * Release all locks held by clients accessing this host |
| 443 | * via the passed in IP address. |
| 444 | */ |
Wendy Cheng | 4373ea8 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 445 | int |
Chuck Lever | 367c8c7 | 2008-06-30 18:58:14 -0400 | [diff] [blame] | 446 | nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr) |
Wendy Cheng | 4373ea8 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 447 | { |
| 448 | int ret; |
Wendy Cheng | 4373ea8 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 449 | |
Chuck Lever | 367c8c7 | 2008-06-30 18:58:14 -0400 | [diff] [blame] | 450 | ret = nlm_traverse_files(server_addr, nlmsvc_match_ip, NULL); |
| 451 | return ret ? -EIO : 0; |
Wendy Cheng | 4373ea8 | 2008-01-17 11:10:12 -0500 | [diff] [blame] | 452 | } |
| 453 | EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_ip); |