Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/nfs/delegation.c |
| 3 | * |
| 4 | * Copyright (C) 2004 Trond Myklebust |
| 5 | * |
| 6 | * NFS file delegation management |
| 7 | * |
| 8 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/completion.h> |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 10 | #include <linux/kthread.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/module.h> |
| 12 | #include <linux/sched.h> |
| 13 | #include <linux/spinlock.h> |
| 14 | |
| 15 | #include <linux/nfs4.h> |
| 16 | #include <linux/nfs_fs.h> |
| 17 | #include <linux/nfs_xdr.h> |
| 18 | |
Trond Myklebust | 4ce7971 | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 19 | #include "nfs4_fs.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include "delegation.h" |
David Howells | 24c8dbb | 2006-08-22 20:06:10 -0400 | [diff] [blame] | 21 | #include "internal.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
Trond Myklebust | 905f8d1 | 2007-08-06 12:18:34 -0400 | [diff] [blame] | 23 | static void nfs_do_free_delegation(struct nfs_delegation *delegation) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | kfree(delegation); |
| 26 | } |
| 27 | |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 28 | static void nfs_free_delegation_callback(struct rcu_head *head) |
| 29 | { |
| 30 | struct nfs_delegation *delegation = container_of(head, struct nfs_delegation, rcu); |
| 31 | |
Trond Myklebust | 905f8d1 | 2007-08-06 12:18:34 -0400 | [diff] [blame] | 32 | nfs_do_free_delegation(delegation); |
| 33 | } |
| 34 | |
| 35 | static void nfs_free_delegation(struct nfs_delegation *delegation) |
| 36 | { |
| 37 | struct rpc_cred *cred; |
| 38 | |
| 39 | cred = rcu_dereference(delegation->cred); |
| 40 | rcu_assign_pointer(delegation->cred, NULL); |
| 41 | call_rcu(&delegation->rcu, nfs_free_delegation_callback); |
| 42 | if (cred) |
| 43 | put_rpccred(cred); |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 44 | } |
| 45 | |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 46 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state) |
| 47 | { |
| 48 | struct inode *inode = state->inode; |
| 49 | struct file_lock *fl; |
| 50 | int status; |
| 51 | |
| 52 | for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) { |
| 53 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
| 54 | continue; |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 55 | if (nfs_file_open_context(fl->fl_file) != ctx) |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 56 | continue; |
| 57 | status = nfs4_lock_delegation_recall(state, fl); |
| 58 | if (status >= 0) |
| 59 | continue; |
| 60 | switch (status) { |
| 61 | default: |
| 62 | printk(KERN_ERR "%s: unhandled error %d.\n", |
| 63 | __FUNCTION__, status); |
| 64 | case -NFS4ERR_EXPIRED: |
| 65 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
| 66 | case -NFS4ERR_STALE_CLIENTID: |
David Howells | 7539bba | 2006-08-22 20:06:09 -0400 | [diff] [blame] | 67 | nfs4_schedule_state_recovery(NFS_SERVER(inode)->nfs_client); |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 68 | goto out_err; |
| 69 | } |
| 70 | } |
| 71 | return 0; |
| 72 | out_err: |
| 73 | return status; |
| 74 | } |
| 75 | |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 76 | static void nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | { |
| 78 | struct nfs_inode *nfsi = NFS_I(inode); |
| 79 | struct nfs_open_context *ctx; |
| 80 | struct nfs4_state *state; |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 81 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | |
| 83 | again: |
| 84 | spin_lock(&inode->i_lock); |
| 85 | list_for_each_entry(ctx, &nfsi->open_files, list) { |
| 86 | state = ctx->state; |
| 87 | if (state == NULL) |
| 88 | continue; |
| 89 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) |
| 90 | continue; |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 91 | if (memcmp(state->stateid.data, stateid->data, sizeof(state->stateid.data)) != 0) |
| 92 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | get_nfs_open_context(ctx); |
| 94 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 13437e1 | 2007-07-06 15:10:43 -0400 | [diff] [blame] | 95 | err = nfs4_open_delegation_recall(ctx, state, stateid); |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 96 | if (err >= 0) |
| 97 | err = nfs_delegation_claim_locks(ctx, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | put_nfs_open_context(ctx); |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 99 | if (err != 0) |
| 100 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | goto again; |
| 102 | } |
| 103 | spin_unlock(&inode->i_lock); |
| 104 | } |
| 105 | |
| 106 | /* |
| 107 | * Set up a delegation on an inode |
| 108 | */ |
| 109 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) |
| 110 | { |
| 111 | struct nfs_delegation *delegation = NFS_I(inode)->delegation; |
Trond Myklebust | 05c88ba | 2007-10-11 15:11:51 -0400 | [diff] [blame] | 112 | struct rpc_cred *oldcred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | |
| 114 | if (delegation == NULL) |
| 115 | return; |
| 116 | memcpy(delegation->stateid.data, res->delegation.data, |
| 117 | sizeof(delegation->stateid.data)); |
| 118 | delegation->type = res->delegation_type; |
| 119 | delegation->maxsize = res->maxsize; |
Trond Myklebust | 05c88ba | 2007-10-11 15:11:51 -0400 | [diff] [blame] | 120 | oldcred = delegation->cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | delegation->cred = get_rpccred(cred); |
| 122 | delegation->flags &= ~NFS_DELEGATION_NEED_RECLAIM; |
| 123 | NFS_I(inode)->delegation_state = delegation->type; |
| 124 | smp_wmb(); |
Trond Myklebust | 05c88ba | 2007-10-11 15:11:51 -0400 | [diff] [blame] | 125 | put_rpccred(oldcred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | } |
| 127 | |
| 128 | /* |
| 129 | * Set up a delegation on an inode |
| 130 | */ |
| 131 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) |
| 132 | { |
David Howells | 7539bba | 2006-08-22 20:06:09 -0400 | [diff] [blame] | 133 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | struct nfs_inode *nfsi = NFS_I(inode); |
| 135 | struct nfs_delegation *delegation; |
| 136 | int status = 0; |
| 137 | |
Panagiotis Issaris | f52720c | 2006-09-27 01:49:39 -0700 | [diff] [blame] | 138 | delegation = kmalloc(sizeof(*delegation), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | if (delegation == NULL) |
| 140 | return -ENOMEM; |
| 141 | memcpy(delegation->stateid.data, res->delegation.data, |
| 142 | sizeof(delegation->stateid.data)); |
| 143 | delegation->type = res->delegation_type; |
| 144 | delegation->maxsize = res->maxsize; |
Trond Myklebust | beb2a5e | 2006-01-03 09:55:37 +0100 | [diff] [blame] | 145 | delegation->change_attr = nfsi->change_attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | delegation->cred = get_rpccred(cred); |
| 147 | delegation->inode = inode; |
| 148 | |
| 149 | spin_lock(&clp->cl_lock); |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 150 | if (rcu_dereference(nfsi->delegation) == NULL) { |
| 151 | list_add_rcu(&delegation->super_list, &clp->cl_delegations); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | nfsi->delegation_state = delegation->type; |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 153 | rcu_assign_pointer(nfsi->delegation, delegation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | delegation = NULL; |
| 155 | } else { |
| 156 | if (memcmp(&delegation->stateid, &nfsi->delegation->stateid, |
| 157 | sizeof(delegation->stateid)) != 0 || |
| 158 | delegation->type != nfsi->delegation->type) { |
Chuck Lever | 5d8515c | 2007-12-10 14:57:16 -0500 | [diff] [blame^] | 159 | printk(KERN_WARNING "%s: server %s handed out " |
| 160 | "a duplicate delegation!\n", |
| 161 | __FUNCTION__, clp->cl_hostname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | status = -EIO; |
| 163 | } |
| 164 | } |
Trond Myklebust | 412c77c | 2007-07-03 16:10:55 -0400 | [diff] [blame] | 165 | |
| 166 | /* Ensure we revalidate the attributes and page cache! */ |
| 167 | spin_lock(&inode->i_lock); |
| 168 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; |
| 169 | spin_unlock(&inode->i_lock); |
| 170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | 603c83d | 2007-10-18 19:59:20 -0400 | [diff] [blame] | 172 | if (delegation != NULL) |
| 173 | nfs_free_delegation(delegation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | return status; |
| 175 | } |
| 176 | |
| 177 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation) |
| 178 | { |
| 179 | int res = 0; |
| 180 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid); |
Trond Myklebust | 905f8d1 | 2007-08-06 12:18:34 -0400 | [diff] [blame] | 182 | nfs_free_delegation(delegation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | return res; |
| 184 | } |
| 185 | |
| 186 | /* Sync all data to disk upon delegation return */ |
| 187 | static void nfs_msync_inode(struct inode *inode) |
| 188 | { |
| 189 | filemap_fdatawrite(inode->i_mapping); |
| 190 | nfs_wb_all(inode); |
| 191 | filemap_fdatawait(inode->i_mapping); |
| 192 | } |
| 193 | |
| 194 | /* |
| 195 | * Basic procedure for returning a delegation to the server |
| 196 | */ |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 197 | static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | { |
David Howells | 7539bba | 2006-08-22 20:06:09 -0400 | [diff] [blame] | 199 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | struct nfs_inode *nfsi = NFS_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | |
| 202 | nfs_msync_inode(inode); |
| 203 | down_read(&clp->cl_sem); |
| 204 | /* Guard against new delegated open calls */ |
| 205 | down_write(&nfsi->rwsem); |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 206 | nfs_delegation_claim_opens(inode, &delegation->stateid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | up_write(&nfsi->rwsem); |
| 208 | up_read(&clp->cl_sem); |
| 209 | nfs_msync_inode(inode); |
| 210 | |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 211 | return nfs_do_return_delegation(inode, delegation); |
| 212 | } |
| 213 | |
| 214 | static struct nfs_delegation *nfs_detach_delegation_locked(struct nfs_inode *nfsi, const nfs4_stateid *stateid) |
| 215 | { |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 216 | struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation); |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 217 | |
| 218 | if (delegation == NULL) |
| 219 | goto nomatch; |
| 220 | if (stateid != NULL && memcmp(delegation->stateid.data, stateid->data, |
| 221 | sizeof(delegation->stateid.data)) != 0) |
| 222 | goto nomatch; |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 223 | list_del_rcu(&delegation->super_list); |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 224 | nfsi->delegation_state = 0; |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 225 | rcu_assign_pointer(nfsi->delegation, NULL); |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 226 | return delegation; |
| 227 | nomatch: |
| 228 | return NULL; |
| 229 | } |
| 230 | |
| 231 | int nfs_inode_return_delegation(struct inode *inode) |
| 232 | { |
| 233 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
| 234 | struct nfs_inode *nfsi = NFS_I(inode); |
| 235 | struct nfs_delegation *delegation; |
| 236 | int err = 0; |
| 237 | |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 238 | if (rcu_dereference(nfsi->delegation) != NULL) { |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 239 | spin_lock(&clp->cl_lock); |
| 240 | delegation = nfs_detach_delegation_locked(nfsi, NULL); |
| 241 | spin_unlock(&clp->cl_lock); |
| 242 | if (delegation != NULL) |
| 243 | err = __nfs_inode_return_delegation(inode, delegation); |
| 244 | } |
| 245 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | } |
| 247 | |
| 248 | /* |
| 249 | * Return all delegations associated to a super block |
| 250 | */ |
| 251 | void nfs_return_all_delegations(struct super_block *sb) |
| 252 | { |
David Howells | 7539bba | 2006-08-22 20:06:09 -0400 | [diff] [blame] | 253 | struct nfs_client *clp = NFS_SB(sb)->nfs_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | struct nfs_delegation *delegation; |
| 255 | struct inode *inode; |
| 256 | |
| 257 | if (clp == NULL) |
| 258 | return; |
| 259 | restart: |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 260 | rcu_read_lock(); |
| 261 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | if (delegation->inode->i_sb != sb) |
| 263 | continue; |
| 264 | inode = igrab(delegation->inode); |
| 265 | if (inode == NULL) |
| 266 | continue; |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 267 | spin_lock(&clp->cl_lock); |
| 268 | delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 270 | rcu_read_unlock(); |
| 271 | if (delegation != NULL) |
| 272 | __nfs_inode_return_delegation(inode, delegation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | iput(inode); |
| 274 | goto restart; |
| 275 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 276 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | } |
| 278 | |
Trond Myklebust | 10afec90 | 2007-05-14 17:16:04 -0400 | [diff] [blame] | 279 | static int nfs_do_expire_all_delegations(void *ptr) |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 280 | { |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 281 | struct nfs_client *clp = ptr; |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 282 | struct nfs_delegation *delegation; |
| 283 | struct inode *inode; |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 284 | |
| 285 | allow_signal(SIGKILL); |
| 286 | restart: |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 287 | if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) != 0) |
| 288 | goto out; |
| 289 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) |
| 290 | goto out; |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 291 | rcu_read_lock(); |
| 292 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 293 | inode = igrab(delegation->inode); |
| 294 | if (inode == NULL) |
| 295 | continue; |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 296 | spin_lock(&clp->cl_lock); |
| 297 | delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL); |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 298 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 299 | rcu_read_unlock(); |
| 300 | if (delegation) |
| 301 | __nfs_inode_return_delegation(inode, delegation); |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 302 | iput(inode); |
Trond Myklebust | 26c78e1 | 2006-01-03 09:55:58 +0100 | [diff] [blame] | 303 | goto restart; |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 304 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 305 | rcu_read_unlock(); |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 306 | out: |
David Howells | 24c8dbb | 2006-08-22 20:06:10 -0400 | [diff] [blame] | 307 | nfs_put_client(clp); |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 308 | module_put_and_exit(0); |
| 309 | } |
| 310 | |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 311 | void nfs_expire_all_delegations(struct nfs_client *clp) |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 312 | { |
| 313 | struct task_struct *task; |
| 314 | |
| 315 | __module_get(THIS_MODULE); |
| 316 | atomic_inc(&clp->cl_count); |
| 317 | task = kthread_run(nfs_do_expire_all_delegations, clp, |
Chuck Lever | 5d8515c | 2007-12-10 14:57:16 -0500 | [diff] [blame^] | 318 | "%s-delegreturn", |
| 319 | rpc_peeraddr2str(clp->cl_rpcclient, |
| 320 | RPC_DISPLAY_ADDR)); |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 321 | if (!IS_ERR(task)) |
| 322 | return; |
David Howells | 24c8dbb | 2006-08-22 20:06:10 -0400 | [diff] [blame] | 323 | nfs_put_client(clp); |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 324 | module_put(THIS_MODULE); |
| 325 | } |
| 326 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | /* |
| 328 | * Return all delegations following an NFS4ERR_CB_PATH_DOWN error. |
| 329 | */ |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 330 | void nfs_handle_cb_pathdown(struct nfs_client *clp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | { |
| 332 | struct nfs_delegation *delegation; |
| 333 | struct inode *inode; |
| 334 | |
| 335 | if (clp == NULL) |
| 336 | return; |
| 337 | restart: |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 338 | rcu_read_lock(); |
| 339 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | inode = igrab(delegation->inode); |
| 341 | if (inode == NULL) |
| 342 | continue; |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 343 | spin_lock(&clp->cl_lock); |
| 344 | delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 346 | rcu_read_unlock(); |
| 347 | if (delegation != NULL) |
| 348 | __nfs_inode_return_delegation(inode, delegation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | iput(inode); |
| 350 | goto restart; |
| 351 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 352 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | } |
| 354 | |
| 355 | struct recall_threadargs { |
| 356 | struct inode *inode; |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 357 | struct nfs_client *clp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | const nfs4_stateid *stateid; |
| 359 | |
| 360 | struct completion started; |
| 361 | int result; |
| 362 | }; |
| 363 | |
| 364 | static int recall_thread(void *data) |
| 365 | { |
| 366 | struct recall_threadargs *args = (struct recall_threadargs *)data; |
| 367 | struct inode *inode = igrab(args->inode); |
David Howells | 7539bba | 2006-08-22 20:06:09 -0400 | [diff] [blame] | 368 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | struct nfs_inode *nfsi = NFS_I(inode); |
| 370 | struct nfs_delegation *delegation; |
| 371 | |
| 372 | daemonize("nfsv4-delegreturn"); |
| 373 | |
| 374 | nfs_msync_inode(inode); |
| 375 | down_read(&clp->cl_sem); |
| 376 | down_write(&nfsi->rwsem); |
| 377 | spin_lock(&clp->cl_lock); |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 378 | delegation = nfs_detach_delegation_locked(nfsi, args->stateid); |
| 379 | if (delegation != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | args->result = 0; |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 381 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | args->result = -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | spin_unlock(&clp->cl_lock); |
| 384 | complete(&args->started); |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 385 | nfs_delegation_claim_opens(inode, args->stateid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | up_write(&nfsi->rwsem); |
| 387 | up_read(&clp->cl_sem); |
| 388 | nfs_msync_inode(inode); |
| 389 | |
| 390 | if (delegation != NULL) |
| 391 | nfs_do_return_delegation(inode, delegation); |
| 392 | iput(inode); |
| 393 | module_put_and_exit(0); |
| 394 | } |
| 395 | |
| 396 | /* |
| 397 | * Asynchronous delegation recall! |
| 398 | */ |
| 399 | int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid) |
| 400 | { |
| 401 | struct recall_threadargs data = { |
| 402 | .inode = inode, |
| 403 | .stateid = stateid, |
| 404 | }; |
| 405 | int status; |
| 406 | |
| 407 | init_completion(&data.started); |
| 408 | __module_get(THIS_MODULE); |
| 409 | status = kernel_thread(recall_thread, &data, CLONE_KERNEL); |
| 410 | if (status < 0) |
| 411 | goto out_module_put; |
| 412 | wait_for_completion(&data.started); |
| 413 | return data.result; |
| 414 | out_module_put: |
| 415 | module_put(THIS_MODULE); |
| 416 | return status; |
| 417 | } |
| 418 | |
| 419 | /* |
| 420 | * Retrieve the inode associated with a delegation |
| 421 | */ |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 422 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | { |
| 424 | struct nfs_delegation *delegation; |
| 425 | struct inode *res = NULL; |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 426 | rcu_read_lock(); |
| 427 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | if (nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { |
| 429 | res = igrab(delegation->inode); |
| 430 | break; |
| 431 | } |
| 432 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 433 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | return res; |
| 435 | } |
| 436 | |
| 437 | /* |
| 438 | * Mark all delegations as needing to be reclaimed |
| 439 | */ |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 440 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | { |
| 442 | struct nfs_delegation *delegation; |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 443 | rcu_read_lock(); |
| 444 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | delegation->flags |= NFS_DELEGATION_NEED_RECLAIM; |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 446 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | } |
| 448 | |
| 449 | /* |
| 450 | * Reap all unclaimed delegations after reboot recovery is done |
| 451 | */ |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 452 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | { |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 454 | struct nfs_delegation *delegation; |
| 455 | restart: |
| 456 | rcu_read_lock(); |
| 457 | list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | if ((delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) |
| 459 | continue; |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 460 | spin_lock(&clp->cl_lock); |
| 461 | delegation = nfs_detach_delegation_locked(NFS_I(delegation->inode), NULL); |
| 462 | spin_unlock(&clp->cl_lock); |
| 463 | rcu_read_unlock(); |
| 464 | if (delegation != NULL) |
Trond Myklebust | 905f8d1 | 2007-08-06 12:18:34 -0400 | [diff] [blame] | 465 | nfs_free_delegation(delegation); |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 466 | goto restart; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 468 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | } |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 470 | |
| 471 | int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode) |
| 472 | { |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 473 | struct nfs_inode *nfsi = NFS_I(inode); |
| 474 | struct nfs_delegation *delegation; |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 475 | int ret = 0; |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 476 | |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 477 | rcu_read_lock(); |
| 478 | delegation = rcu_dereference(nfsi->delegation); |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 479 | if (delegation != NULL) { |
| 480 | memcpy(dst->data, delegation->stateid.data, sizeof(dst->data)); |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 481 | ret = 1; |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 482 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 483 | rcu_read_unlock(); |
| 484 | return ret; |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 485 | } |