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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 13 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/spinlock.h> |
| 15 | |
| 16 | #include <linux/nfs4.h> |
| 17 | #include <linux/nfs_fs.h> |
| 18 | #include <linux/nfs_xdr.h> |
| 19 | |
Trond Myklebust | 4ce7971 | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 20 | #include "nfs4_fs.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include "delegation.h" |
David Howells | 24c8dbb | 2006-08-22 20:06:10 -0400 | [diff] [blame] | 22 | #include "internal.h" |
Trond Myklebust | ca8acf8 | 2013-08-13 10:36:56 -0400 | [diff] [blame] | 23 | #include "nfs4trace.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
Trond Myklebust | 905f8d1 | 2007-08-06 12:18:34 -0400 | [diff] [blame] | 25 | static void nfs_free_delegation(struct nfs_delegation *delegation) |
| 26 | { |
Trond Myklebust | e00b8a2 | 2011-01-27 14:55:39 -0500 | [diff] [blame] | 27 | if (delegation->cred) { |
| 28 | put_rpccred(delegation->cred); |
| 29 | delegation->cred = NULL; |
| 30 | } |
Lai Jiangshan | 26f04dd | 2011-05-01 06:21:54 -0700 | [diff] [blame] | 31 | kfree_rcu(delegation, rcu); |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 32 | } |
| 33 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 34 | /** |
| 35 | * nfs_mark_delegation_referenced - set delegation's REFERENCED flag |
| 36 | * @delegation: delegation to process |
| 37 | * |
| 38 | */ |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 39 | void nfs_mark_delegation_referenced(struct nfs_delegation *delegation) |
| 40 | { |
| 41 | set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags); |
| 42 | } |
| 43 | |
Peng Tao | 15bb3af | 2014-07-03 13:05:00 +0800 | [diff] [blame] | 44 | static int |
| 45 | nfs4_do_check_delegation(struct inode *inode, fmode_t flags, bool mark) |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 46 | { |
| 47 | struct nfs_delegation *delegation; |
| 48 | int ret = 0; |
| 49 | |
| 50 | flags &= FMODE_READ|FMODE_WRITE; |
| 51 | rcu_read_lock(); |
| 52 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 53 | if (delegation != NULL && (delegation->type & flags) == flags && |
| 54 | !test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) { |
Peng Tao | 15bb3af | 2014-07-03 13:05:00 +0800 | [diff] [blame] | 55 | if (mark) |
| 56 | nfs_mark_delegation_referenced(delegation); |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 57 | ret = 1; |
| 58 | } |
| 59 | rcu_read_unlock(); |
| 60 | return ret; |
| 61 | } |
Peng Tao | 15bb3af | 2014-07-03 13:05:00 +0800 | [diff] [blame] | 62 | /** |
| 63 | * nfs_have_delegation - check if inode has a delegation, mark it |
| 64 | * NFS_DELEGATION_REFERENCED if there is one. |
| 65 | * @inode: inode to check |
| 66 | * @flags: delegation types to check for |
| 67 | * |
| 68 | * Returns one if inode has the indicated delegation, otherwise zero. |
| 69 | */ |
| 70 | int nfs4_have_delegation(struct inode *inode, fmode_t flags) |
| 71 | { |
| 72 | return nfs4_do_check_delegation(inode, flags, true); |
| 73 | } |
| 74 | |
| 75 | /* |
| 76 | * nfs4_check_delegation - check if inode has a delegation, do not mark |
| 77 | * NFS_DELEGATION_REFERENCED if it has one. |
| 78 | */ |
| 79 | int nfs4_check_delegation(struct inode *inode, fmode_t flags) |
| 80 | { |
| 81 | return nfs4_do_check_delegation(inode, flags, false); |
| 82 | } |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 83 | |
Trond Myklebust | db4f2e63 | 2013-04-01 15:56:46 -0400 | [diff] [blame] | 84 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid) |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 85 | { |
| 86 | struct inode *inode = state->inode; |
| 87 | struct file_lock *fl; |
Jeff Layton | 5263e31 | 2015-01-16 15:05:55 -0500 | [diff] [blame^] | 88 | struct file_lock_context *flctx; |
Trond Myklebust | d512220 | 2009-06-17 13:22:58 -0700 | [diff] [blame] | 89 | int status = 0; |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 90 | |
Jeff Layton | 5263e31 | 2015-01-16 15:05:55 -0500 | [diff] [blame^] | 91 | if (inode->i_flock == NULL && inode->i_flctx == NULL) |
Trond Myklebust | 65b62a2 | 2013-02-07 10:54:07 -0500 | [diff] [blame] | 92 | goto out; |
Jeff Layton | 314d7cc | 2013-04-10 15:36:48 -0400 | [diff] [blame] | 93 | |
Jeff Layton | 1c8c601 | 2013-06-21 08:58:15 -0400 | [diff] [blame] | 94 | /* Protect inode->i_flock using the i_lock */ |
| 95 | spin_lock(&inode->i_lock); |
Harvey Harrison | 90dc7d2 | 2008-02-20 13:03:05 -0800 | [diff] [blame] | 96 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
Jeff Layton | 5263e31 | 2015-01-16 15:05:55 -0500 | [diff] [blame^] | 97 | if (!(fl->fl_flags & (FL_POSIX))) |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 98 | continue; |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 99 | if (nfs_file_open_context(fl->fl_file) != ctx) |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 100 | continue; |
Jeff Layton | 1c8c601 | 2013-06-21 08:58:15 -0400 | [diff] [blame] | 101 | spin_unlock(&inode->i_lock); |
Trond Myklebust | db4f2e63 | 2013-04-01 15:56:46 -0400 | [diff] [blame] | 102 | status = nfs4_lock_delegation_recall(fl, state, stateid); |
Trond Myklebust | d512220 | 2009-06-17 13:22:58 -0700 | [diff] [blame] | 103 | if (status < 0) |
Trond Myklebust | 3f09df7 | 2009-06-17 13:23:00 -0700 | [diff] [blame] | 104 | goto out; |
Jeff Layton | 1c8c601 | 2013-06-21 08:58:15 -0400 | [diff] [blame] | 105 | spin_lock(&inode->i_lock); |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 106 | } |
Jeff Layton | 5263e31 | 2015-01-16 15:05:55 -0500 | [diff] [blame^] | 107 | |
| 108 | flctx = inode->i_flctx; |
| 109 | if (flctx) { |
| 110 | list_for_each_entry(fl, &flctx->flc_flock, fl_list) { |
| 111 | if (nfs_file_open_context(fl->fl_file) != ctx) |
| 112 | continue; |
| 113 | spin_unlock(&inode->i_lock); |
| 114 | status = nfs4_lock_delegation_recall(fl, state, |
| 115 | stateid); |
| 116 | if (status < 0) |
| 117 | goto out; |
| 118 | spin_lock(&inode->i_lock); |
| 119 | } |
| 120 | } |
Jeff Layton | 1c8c601 | 2013-06-21 08:58:15 -0400 | [diff] [blame] | 121 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 3f09df7 | 2009-06-17 13:23:00 -0700 | [diff] [blame] | 122 | out: |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 123 | return status; |
| 124 | } |
| 125 | |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 126 | static int nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | { |
| 128 | struct nfs_inode *nfsi = NFS_I(inode); |
| 129 | struct nfs_open_context *ctx; |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 130 | struct nfs4_state_owner *sp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | struct nfs4_state *state; |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 132 | unsigned int seq; |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 133 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
| 135 | again: |
| 136 | spin_lock(&inode->i_lock); |
| 137 | list_for_each_entry(ctx, &nfsi->open_files, list) { |
| 138 | state = ctx->state; |
| 139 | if (state == NULL) |
| 140 | continue; |
| 141 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) |
| 142 | continue; |
Trond Myklebust | f8ebf7a | 2014-10-17 23:02:52 +0300 | [diff] [blame] | 143 | if (!nfs4_valid_open_stateid(state)) |
| 144 | continue; |
Trond Myklebust | f597c53 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 145 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 146 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | get_nfs_open_context(ctx); |
| 148 | spin_unlock(&inode->i_lock); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 149 | sp = state->owner; |
Trond Myklebust | 65b62a2 | 2013-02-07 10:54:07 -0500 | [diff] [blame] | 150 | /* Block nfs4_proc_unlck */ |
| 151 | mutex_lock(&sp->so_delegreturn_mutex); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 152 | seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); |
Trond Myklebust | 13437e1 | 2007-07-06 15:10:43 -0400 | [diff] [blame] | 153 | err = nfs4_open_delegation_recall(ctx, state, stateid); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 154 | if (!err) |
Trond Myklebust | db4f2e63 | 2013-04-01 15:56:46 -0400 | [diff] [blame] | 155 | err = nfs_delegation_claim_locks(ctx, state, stateid); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 156 | if (!err && read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) |
| 157 | err = -EAGAIN; |
Trond Myklebust | 65b62a2 | 2013-02-07 10:54:07 -0500 | [diff] [blame] | 158 | mutex_unlock(&sp->so_delegreturn_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | put_nfs_open_context(ctx); |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 160 | if (err != 0) |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 161 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | goto again; |
| 163 | } |
| 164 | spin_unlock(&inode->i_lock); |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 165 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | } |
| 167 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 168 | /** |
| 169 | * nfs_inode_reclaim_delegation - process a delegation reclaim request |
| 170 | * @inode: inode to process |
| 171 | * @cred: credential to use for request |
| 172 | * @res: new delegation state from server |
| 173 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | */ |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 175 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, |
| 176 | struct nfs_openres *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | { |
Trond Myklebust | 8f649c3 | 2010-05-01 12:36:18 -0400 | [diff] [blame] | 178 | struct nfs_delegation *delegation; |
| 179 | struct rpc_cred *oldcred = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
Trond Myklebust | 8f649c3 | 2010-05-01 12:36:18 -0400 | [diff] [blame] | 181 | rcu_read_lock(); |
| 182 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
| 183 | if (delegation != NULL) { |
| 184 | spin_lock(&delegation->lock); |
| 185 | if (delegation->inode != NULL) { |
Trond Myklebust | f597c53 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 186 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
Trond Myklebust | 8f649c3 | 2010-05-01 12:36:18 -0400 | [diff] [blame] | 187 | delegation->type = res->delegation_type; |
| 188 | delegation->maxsize = res->maxsize; |
| 189 | oldcred = delegation->cred; |
| 190 | delegation->cred = get_rpccred(cred); |
| 191 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, |
| 192 | &delegation->flags); |
| 193 | NFS_I(inode)->delegation_state = delegation->type; |
| 194 | spin_unlock(&delegation->lock); |
| 195 | put_rpccred(oldcred); |
| 196 | rcu_read_unlock(); |
Trond Myklebust | ca8acf8 | 2013-08-13 10:36:56 -0400 | [diff] [blame] | 197 | trace_nfs4_reclaim_delegation(inode, res->delegation_type); |
Trond Myklebust | 8f649c3 | 2010-05-01 12:36:18 -0400 | [diff] [blame] | 198 | } else { |
| 199 | /* We appear to have raced with a delegation return. */ |
| 200 | spin_unlock(&delegation->lock); |
| 201 | rcu_read_unlock(); |
| 202 | nfs_inode_set_delegation(inode, cred, res); |
| 203 | } |
| 204 | } else { |
| 205 | rcu_read_unlock(); |
| 206 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | } |
| 208 | |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 209 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
| 210 | { |
| 211 | int res = 0; |
| 212 | |
Trond Myklebust | 869f9df | 2014-11-10 18:43:56 -0500 | [diff] [blame] | 213 | if (!test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) |
| 214 | res = nfs4_proc_delegreturn(inode, |
| 215 | delegation->cred, |
| 216 | &delegation->stateid, |
| 217 | issync); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 218 | nfs_free_delegation(delegation); |
| 219 | return res; |
| 220 | } |
| 221 | |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 222 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
| 223 | { |
| 224 | struct inode *inode = NULL; |
| 225 | |
| 226 | spin_lock(&delegation->lock); |
| 227 | if (delegation->inode != NULL) |
| 228 | inode = igrab(delegation->inode); |
| 229 | spin_unlock(&delegation->lock); |
| 230 | return inode; |
| 231 | } |
| 232 | |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 233 | static struct nfs_delegation * |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 234 | nfs_start_delegation_return_locked(struct nfs_inode *nfsi) |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 235 | { |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 236 | struct nfs_delegation *ret = NULL; |
| 237 | struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 238 | |
| 239 | if (delegation == NULL) |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 240 | goto out; |
| 241 | spin_lock(&delegation->lock); |
| 242 | if (!test_and_set_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) |
| 243 | ret = delegation; |
| 244 | spin_unlock(&delegation->lock); |
| 245 | out: |
| 246 | return ret; |
| 247 | } |
| 248 | |
| 249 | static struct nfs_delegation * |
| 250 | nfs_start_delegation_return(struct nfs_inode *nfsi) |
| 251 | { |
| 252 | struct nfs_delegation *delegation; |
| 253 | |
| 254 | rcu_read_lock(); |
| 255 | delegation = nfs_start_delegation_return_locked(nfsi); |
| 256 | rcu_read_unlock(); |
| 257 | return delegation; |
| 258 | } |
| 259 | |
| 260 | static void |
| 261 | nfs_abort_delegation_return(struct nfs_delegation *delegation, |
| 262 | struct nfs_client *clp) |
| 263 | { |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 264 | |
Trond Myklebust | 3431043 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 265 | spin_lock(&delegation->lock); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 266 | clear_bit(NFS_DELEGATION_RETURNING, &delegation->flags); |
| 267 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
| 268 | spin_unlock(&delegation->lock); |
| 269 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); |
| 270 | } |
| 271 | |
| 272 | static struct nfs_delegation * |
| 273 | nfs_detach_delegation_locked(struct nfs_inode *nfsi, |
| 274 | struct nfs_delegation *delegation, |
| 275 | struct nfs_client *clp) |
| 276 | { |
| 277 | struct nfs_delegation *deleg_cur = |
| 278 | rcu_dereference_protected(nfsi->delegation, |
| 279 | lockdep_is_held(&clp->cl_lock)); |
| 280 | |
| 281 | if (deleg_cur == NULL || delegation != deleg_cur) |
| 282 | return NULL; |
| 283 | |
| 284 | spin_lock(&delegation->lock); |
| 285 | set_bit(NFS_DELEGATION_RETURNING, &delegation->flags); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 286 | list_del_rcu(&delegation->super_list); |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 287 | delegation->inode = NULL; |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 288 | nfsi->delegation_state = 0; |
| 289 | rcu_assign_pointer(nfsi->delegation, NULL); |
Trond Myklebust | 3431043 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 290 | spin_unlock(&delegation->lock); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 291 | return delegation; |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 292 | } |
| 293 | |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 294 | static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi, |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 295 | struct nfs_delegation *delegation, |
| 296 | struct nfs_server *server) |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 297 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 298 | struct nfs_client *clp = server->nfs_client; |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 299 | |
| 300 | spin_lock(&clp->cl_lock); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 301 | delegation = nfs_detach_delegation_locked(nfsi, delegation, clp); |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 302 | spin_unlock(&clp->cl_lock); |
| 303 | return delegation; |
| 304 | } |
| 305 | |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 306 | static struct nfs_delegation * |
| 307 | nfs_inode_detach_delegation(struct inode *inode) |
| 308 | { |
| 309 | struct nfs_inode *nfsi = NFS_I(inode); |
| 310 | struct nfs_server *server = NFS_SERVER(inode); |
| 311 | struct nfs_delegation *delegation; |
| 312 | |
| 313 | delegation = nfs_start_delegation_return(nfsi); |
| 314 | if (delegation == NULL) |
| 315 | return NULL; |
| 316 | return nfs_detach_delegation(nfsi, delegation, server); |
| 317 | } |
| 318 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 319 | /** |
| 320 | * nfs_inode_set_delegation - set up a delegation on an inode |
| 321 | * @inode: inode to which delegation applies |
| 322 | * @cred: cred to use for subsequent delegation processing |
| 323 | * @res: new delegation state from server |
| 324 | * |
| 325 | * Returns zero on success, or a negative errno value. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | */ |
| 327 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) |
| 328 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 329 | struct nfs_server *server = NFS_SERVER(inode); |
| 330 | struct nfs_client *clp = server->nfs_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | struct nfs_inode *nfsi = NFS_I(inode); |
David Howells | 17d2c0a | 2010-05-01 12:37:18 -0400 | [diff] [blame] | 332 | struct nfs_delegation *delegation, *old_delegation; |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 333 | struct nfs_delegation *freeme = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | int status = 0; |
| 335 | |
Trond Myklebust | 8535b2b | 2010-05-13 12:51:01 -0400 | [diff] [blame] | 336 | delegation = kmalloc(sizeof(*delegation), GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | if (delegation == NULL) |
| 338 | return -ENOMEM; |
Trond Myklebust | f597c53 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 339 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | delegation->type = res->delegation_type; |
| 341 | delegation->maxsize = res->maxsize; |
Trond Myklebust | a9a4a87 | 2011-10-17 16:08:46 -0700 | [diff] [blame] | 342 | delegation->change_attr = inode->i_version; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | delegation->cred = get_rpccred(cred); |
| 344 | delegation->inode = inode; |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 345 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
Trond Myklebust | 3431043 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 346 | spin_lock_init(&delegation->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | |
| 348 | spin_lock(&clp->cl_lock); |
David Howells | 17d2c0a | 2010-05-01 12:37:18 -0400 | [diff] [blame] | 349 | old_delegation = rcu_dereference_protected(nfsi->delegation, |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 350 | lockdep_is_held(&clp->cl_lock)); |
David Howells | 17d2c0a | 2010-05-01 12:37:18 -0400 | [diff] [blame] | 351 | if (old_delegation != NULL) { |
Trond Myklebust | f597c53 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 352 | if (nfs4_stateid_match(&delegation->stateid, |
| 353 | &old_delegation->stateid) && |
David Howells | 17d2c0a | 2010-05-01 12:37:18 -0400 | [diff] [blame] | 354 | delegation->type == old_delegation->type) { |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 355 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | } |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 357 | /* |
| 358 | * Deal with broken servers that hand out two |
| 359 | * delegations for the same file. |
Trond Myklebust | 1728017 | 2012-03-11 13:11:00 -0400 | [diff] [blame] | 360 | * Allow for upgrades to a WRITE delegation, but |
| 361 | * nothing else. |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 362 | */ |
| 363 | dfprintk(FILE, "%s: server %s handed out " |
| 364 | "a duplicate delegation!\n", |
Harvey Harrison | 3110ff8 | 2008-05-02 13:42:44 -0700 | [diff] [blame] | 365 | __func__, clp->cl_hostname); |
Trond Myklebust | 1728017 | 2012-03-11 13:11:00 -0400 | [diff] [blame] | 366 | if (delegation->type == old_delegation->type || |
| 367 | !(delegation->type & FMODE_WRITE)) { |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 368 | freeme = delegation; |
| 369 | delegation = NULL; |
| 370 | goto out; |
| 371 | } |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 372 | freeme = nfs_detach_delegation_locked(nfsi, |
| 373 | old_delegation, clp); |
| 374 | if (freeme == NULL) |
| 375 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | } |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 377 | list_add_rcu(&delegation->super_list, &server->delegations); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 378 | nfsi->delegation_state = delegation->type; |
| 379 | rcu_assign_pointer(nfsi->delegation, delegation); |
| 380 | delegation = NULL; |
Trond Myklebust | 412c77c | 2007-07-03 16:10:55 -0400 | [diff] [blame] | 381 | |
| 382 | /* Ensure we revalidate the attributes and page cache! */ |
| 383 | spin_lock(&inode->i_lock); |
| 384 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; |
| 385 | spin_unlock(&inode->i_lock); |
Trond Myklebust | ca8acf8 | 2013-08-13 10:36:56 -0400 | [diff] [blame] | 386 | trace_nfs4_set_delegation(inode, res->delegation_type); |
Trond Myklebust | 412c77c | 2007-07-03 16:10:55 -0400 | [diff] [blame] | 387 | |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 388 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | 603c83d | 2007-10-18 19:59:20 -0400 | [diff] [blame] | 390 | if (delegation != NULL) |
| 391 | nfs_free_delegation(delegation); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 392 | if (freeme != NULL) |
| 393 | nfs_do_return_delegation(inode, freeme, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | return status; |
| 395 | } |
| 396 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | /* |
| 398 | * Basic procedure for returning a delegation to the server |
| 399 | */ |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 400 | static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation *delegation, int issync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | { |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 402 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | struct nfs_inode *nfsi = NFS_I(inode); |
Trond Myklebust | 869f9df | 2014-11-10 18:43:56 -0500 | [diff] [blame] | 404 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 406 | if (delegation == NULL) |
| 407 | return 0; |
| 408 | do { |
Trond Myklebust | 869f9df | 2014-11-10 18:43:56 -0500 | [diff] [blame] | 409 | if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) |
| 410 | break; |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 411 | err = nfs_delegation_claim_opens(inode, &delegation->stateid); |
| 412 | if (!issync || err != -EAGAIN) |
| 413 | break; |
| 414 | /* |
| 415 | * Guard against state recovery |
| 416 | */ |
| 417 | err = nfs4_wait_clnt_recover(clp); |
| 418 | } while (err == 0); |
| 419 | |
| 420 | if (err) { |
| 421 | nfs_abort_delegation_return(delegation, clp); |
| 422 | goto out; |
| 423 | } |
| 424 | if (!nfs_detach_delegation(nfsi, delegation, NFS_SERVER(inode))) |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 425 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 427 | err = nfs_do_return_delegation(inode, delegation, issync); |
| 428 | out: |
| 429 | return err; |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 430 | } |
| 431 | |
Trond Myklebust | b757144 | 2013-04-03 14:33:49 -0400 | [diff] [blame] | 432 | static bool nfs_delegation_need_return(struct nfs_delegation *delegation) |
| 433 | { |
| 434 | bool ret = false; |
| 435 | |
| 436 | if (test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags)) |
| 437 | ret = true; |
| 438 | if (test_and_clear_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags) && !ret) { |
| 439 | struct inode *inode; |
| 440 | |
| 441 | spin_lock(&delegation->lock); |
| 442 | inode = delegation->inode; |
| 443 | if (inode && list_empty(&NFS_I(inode)->open_files)) |
| 444 | ret = true; |
| 445 | spin_unlock(&delegation->lock); |
| 446 | } |
| 447 | return ret; |
| 448 | } |
| 449 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 450 | /** |
| 451 | * nfs_client_return_marked_delegations - return previously marked delegations |
| 452 | * @clp: nfs_client to process |
| 453 | * |
Trond Myklebust | dc327ed | 2012-05-06 19:46:30 -0400 | [diff] [blame] | 454 | * Note that this function is designed to be called by the state |
| 455 | * manager thread. For this reason, it cannot flush the dirty data, |
| 456 | * since that could deadlock in case of a state recovery error. |
| 457 | * |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 458 | * Returns zero on success, or a negative errno value. |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 459 | */ |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 460 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 461 | { |
| 462 | struct nfs_delegation *delegation; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 463 | struct nfs_server *server; |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 464 | struct inode *inode; |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 465 | int err = 0; |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 466 | |
| 467 | restart: |
| 468 | rcu_read_lock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 469 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| 470 | list_for_each_entry_rcu(delegation, &server->delegations, |
| 471 | super_list) { |
Trond Myklebust | b757144 | 2013-04-03 14:33:49 -0400 | [diff] [blame] | 472 | if (!nfs_delegation_need_return(delegation)) |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 473 | continue; |
| 474 | inode = nfs_delegation_grab_inode(delegation); |
| 475 | if (inode == NULL) |
| 476 | continue; |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 477 | delegation = nfs_start_delegation_return_locked(NFS_I(inode)); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 478 | rcu_read_unlock(); |
| 479 | |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 480 | err = nfs_end_delegation_return(inode, delegation, 0); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 481 | iput(inode); |
| 482 | if (!err) |
| 483 | goto restart; |
| 484 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); |
| 485 | return err; |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 486 | } |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 487 | } |
| 488 | rcu_read_unlock(); |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 489 | return 0; |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 490 | } |
| 491 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 492 | /** |
| 493 | * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens |
| 494 | * @inode: inode to process |
| 495 | * |
| 496 | * Does not protect against delegation reclaims, therefore really only safe |
| 497 | * to be called from nfs4_clear_inode(). |
Trond Myklebust | e6f8107 | 2008-01-24 18:14:34 -0500 | [diff] [blame] | 498 | */ |
| 499 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) |
| 500 | { |
Trond Myklebust | e6f8107 | 2008-01-24 18:14:34 -0500 | [diff] [blame] | 501 | struct nfs_delegation *delegation; |
| 502 | |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 503 | delegation = nfs_inode_detach_delegation(inode); |
| 504 | if (delegation != NULL) |
| 505 | nfs_do_return_delegation(inode, delegation, 0); |
Trond Myklebust | e6f8107 | 2008-01-24 18:14:34 -0500 | [diff] [blame] | 506 | } |
| 507 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 508 | /** |
| 509 | * nfs_inode_return_delegation - synchronously return a delegation |
| 510 | * @inode: inode to process |
| 511 | * |
Trond Myklebust | c57d1bc | 2012-05-06 19:34:17 -0400 | [diff] [blame] | 512 | * This routine will always flush any dirty data to disk on the |
| 513 | * assumption that if we need to return the delegation, then |
| 514 | * we should stop caching. |
| 515 | * |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 516 | * Returns zero on success, or a negative errno value. |
| 517 | */ |
Bryan Schumaker | 57ec14c | 2012-06-20 15:53:44 -0400 | [diff] [blame] | 518 | int nfs4_inode_return_delegation(struct inode *inode) |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 519 | { |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 520 | struct nfs_inode *nfsi = NFS_I(inode); |
| 521 | struct nfs_delegation *delegation; |
| 522 | int err = 0; |
| 523 | |
Trond Myklebust | c57d1bc | 2012-05-06 19:34:17 -0400 | [diff] [blame] | 524 | nfs_wb_all(inode); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 525 | delegation = nfs_start_delegation_return(nfsi); |
| 526 | if (delegation != NULL) |
| 527 | err = nfs_end_delegation_return(inode, delegation, 1); |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 528 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | } |
| 530 | |
Trond Myklebust | b757144 | 2013-04-03 14:33:49 -0400 | [diff] [blame] | 531 | static void nfs_mark_return_if_closed_delegation(struct nfs_server *server, |
| 532 | struct nfs_delegation *delegation) |
| 533 | { |
| 534 | set_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags); |
| 535 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); |
| 536 | } |
| 537 | |
Trond Myklebust | ed1e621 | 2011-07-25 15:37:29 -0400 | [diff] [blame] | 538 | static void nfs_mark_return_delegation(struct nfs_server *server, |
| 539 | struct nfs_delegation *delegation) |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 540 | { |
| 541 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
Trond Myklebust | ed1e621 | 2011-07-25 15:37:29 -0400 | [diff] [blame] | 542 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 543 | } |
| 544 | |
Trond Myklebust | 5c31e23 | 2013-04-03 19:04:58 -0400 | [diff] [blame] | 545 | static bool nfs_server_mark_return_all_delegations(struct nfs_server *server) |
| 546 | { |
| 547 | struct nfs_delegation *delegation; |
| 548 | bool ret = false; |
| 549 | |
| 550 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
| 551 | nfs_mark_return_delegation(server, delegation); |
| 552 | ret = true; |
| 553 | } |
| 554 | return ret; |
| 555 | } |
| 556 | |
Trond Myklebust | b02ba0b | 2013-04-03 19:23:58 -0400 | [diff] [blame] | 557 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
| 558 | { |
| 559 | struct nfs_server *server; |
| 560 | |
| 561 | rcu_read_lock(); |
| 562 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| 563 | nfs_server_mark_return_all_delegations(server); |
| 564 | rcu_read_unlock(); |
| 565 | } |
| 566 | |
| 567 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) |
| 568 | { |
| 569 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) |
| 570 | nfs4_schedule_state_manager(clp); |
| 571 | } |
| 572 | |
| 573 | /** |
| 574 | * nfs_expire_all_delegations |
| 575 | * @clp: client to process |
| 576 | * |
| 577 | */ |
| 578 | void nfs_expire_all_delegations(struct nfs_client *clp) |
| 579 | { |
| 580 | nfs_client_mark_return_all_delegations(clp); |
| 581 | nfs_delegation_run_state_manager(clp); |
| 582 | } |
| 583 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 584 | /** |
| 585 | * nfs_super_return_all_delegations - return delegations for one superblock |
| 586 | * @sb: sb to process |
| 587 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | */ |
Bryan Schumaker | eeebf91 | 2012-06-20 15:53:41 -0400 | [diff] [blame] | 589 | void nfs_server_return_all_delegations(struct nfs_server *server) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 591 | struct nfs_client *clp = server->nfs_client; |
Trond Myklebust | 5c31e23 | 2013-04-03 19:04:58 -0400 | [diff] [blame] | 592 | bool need_wait; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
| 594 | if (clp == NULL) |
| 595 | return; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 596 | |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 597 | rcu_read_lock(); |
Trond Myklebust | 5c31e23 | 2013-04-03 19:04:58 -0400 | [diff] [blame] | 598 | need_wait = nfs_server_mark_return_all_delegations(server); |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 599 | rcu_read_unlock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 600 | |
Trond Myklebust | 5c31e23 | 2013-04-03 19:04:58 -0400 | [diff] [blame] | 601 | if (need_wait) { |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 602 | nfs4_schedule_state_manager(clp); |
Trond Myklebust | 5c31e23 | 2013-04-03 19:04:58 -0400 | [diff] [blame] | 603 | nfs4_wait_clnt_recover(clp); |
| 604 | } |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 605 | } |
| 606 | |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 607 | static void nfs_mark_return_unused_delegation_types(struct nfs_server *server, |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 608 | fmode_t flags) |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 609 | { |
| 610 | struct nfs_delegation *delegation; |
| 611 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 612 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
Alexandros Batsakis | c79571a | 2009-12-05 13:20:52 -0500 | [diff] [blame] | 613 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
| 614 | continue; |
| 615 | if (delegation->type & flags) |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 616 | nfs_mark_return_if_closed_delegation(server, delegation); |
Trond Myklebust | 707fb4b | 2008-12-23 15:21:47 -0500 | [diff] [blame] | 617 | } |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 618 | } |
| 619 | |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 620 | static void nfs_client_mark_return_unused_delegation_types(struct nfs_client *clp, |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 621 | fmode_t flags) |
| 622 | { |
| 623 | struct nfs_server *server; |
| 624 | |
| 625 | rcu_read_lock(); |
| 626 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 627 | nfs_mark_return_unused_delegation_types(server, flags); |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 628 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | } |
| 630 | |
Trond Myklebust | 869f9df | 2014-11-10 18:43:56 -0500 | [diff] [blame] | 631 | static void nfs_revoke_delegation(struct inode *inode) |
| 632 | { |
| 633 | struct nfs_delegation *delegation; |
| 634 | rcu_read_lock(); |
| 635 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
| 636 | if (delegation != NULL) { |
| 637 | set_bit(NFS_DELEGATION_REVOKED, &delegation->flags); |
| 638 | nfs_mark_return_delegation(NFS_SERVER(inode), delegation); |
| 639 | } |
| 640 | rcu_read_unlock(); |
| 641 | } |
| 642 | |
Trond Myklebust | a1d0b5e | 2012-03-05 19:56:44 -0500 | [diff] [blame] | 643 | void nfs_remove_bad_delegation(struct inode *inode) |
| 644 | { |
| 645 | struct nfs_delegation *delegation; |
| 646 | |
Trond Myklebust | 869f9df | 2014-11-10 18:43:56 -0500 | [diff] [blame] | 647 | nfs_revoke_delegation(inode); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 648 | delegation = nfs_inode_detach_delegation(inode); |
Trond Myklebust | a1d0b5e | 2012-03-05 19:56:44 -0500 | [diff] [blame] | 649 | if (delegation) { |
| 650 | nfs_inode_find_state_and_recover(inode, &delegation->stateid); |
| 651 | nfs_free_delegation(delegation); |
| 652 | } |
| 653 | } |
Andy Adamson | 9cb8196 | 2012-03-07 10:49:41 -0500 | [diff] [blame] | 654 | EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation); |
Trond Myklebust | a1d0b5e | 2012-03-05 19:56:44 -0500 | [diff] [blame] | 655 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 656 | /** |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 657 | * nfs_expire_unused_delegation_types |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 658 | * @clp: client to process |
| 659 | * @flags: delegation types to expire |
| 660 | * |
| 661 | */ |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 662 | void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags) |
Alexandros Batsakis | c79571a | 2009-12-05 13:20:52 -0500 | [diff] [blame] | 663 | { |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 664 | nfs_client_mark_return_unused_delegation_types(clp, flags); |
Alexandros Batsakis | c79571a | 2009-12-05 13:20:52 -0500 | [diff] [blame] | 665 | nfs_delegation_run_state_manager(clp); |
| 666 | } |
| 667 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 668 | static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server) |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 669 | { |
| 670 | struct nfs_delegation *delegation; |
| 671 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 672 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 673 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) |
| 674 | continue; |
Trond Myklebust | b757144 | 2013-04-03 14:33:49 -0400 | [diff] [blame] | 675 | nfs_mark_return_if_closed_delegation(server, delegation); |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 676 | } |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 677 | } |
| 678 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 679 | /** |
| 680 | * nfs_expire_unreferenced_delegations - Eliminate unused delegations |
| 681 | * @clp: nfs_client to process |
| 682 | * |
| 683 | */ |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 684 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) |
| 685 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 686 | struct nfs_server *server; |
| 687 | |
| 688 | rcu_read_lock(); |
| 689 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| 690 | nfs_mark_return_unreferenced_delegations(server); |
| 691 | rcu_read_unlock(); |
| 692 | |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 693 | nfs_delegation_run_state_manager(clp); |
| 694 | } |
| 695 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 696 | /** |
| 697 | * nfs_async_inode_return_delegation - asynchronously return a delegation |
| 698 | * @inode: inode to process |
Trond Myklebust | 8e663f0 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 699 | * @stateid: state ID information |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 700 | * |
| 701 | * Returns zero on success, or a negative errno value. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | */ |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 703 | int nfs_async_inode_return_delegation(struct inode *inode, |
| 704 | const nfs4_stateid *stateid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | { |
Trond Myklebust | ed1e621 | 2011-07-25 15:37:29 -0400 | [diff] [blame] | 706 | struct nfs_server *server = NFS_SERVER(inode); |
| 707 | struct nfs_client *clp = server->nfs_client; |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 708 | struct nfs_delegation *delegation; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | |
Trond Myklebust | dc327ed | 2012-05-06 19:46:30 -0400 | [diff] [blame] | 710 | filemap_flush(inode->i_mapping); |
| 711 | |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 712 | rcu_read_lock(); |
| 713 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
Trond Myklebust | 755a48a | 2014-03-02 22:03:12 -0500 | [diff] [blame] | 714 | if (delegation == NULL) |
| 715 | goto out_enoent; |
Alexandros Batsakis | 2597641 | 2009-12-05 13:48:55 -0500 | [diff] [blame] | 716 | |
Trond Myklebust | 755a48a | 2014-03-02 22:03:12 -0500 | [diff] [blame] | 717 | if (!clp->cl_mvops->match_stateid(&delegation->stateid, stateid)) |
| 718 | goto out_enoent; |
Trond Myklebust | ed1e621 | 2011-07-25 15:37:29 -0400 | [diff] [blame] | 719 | nfs_mark_return_delegation(server, delegation); |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 720 | rcu_read_unlock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 721 | |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 722 | nfs_delegation_run_state_manager(clp); |
| 723 | return 0; |
Trond Myklebust | 755a48a | 2014-03-02 22:03:12 -0500 | [diff] [blame] | 724 | out_enoent: |
| 725 | rcu_read_unlock(); |
| 726 | return -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | } |
| 728 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 729 | static struct inode * |
| 730 | nfs_delegation_find_inode_server(struct nfs_server *server, |
| 731 | const struct nfs_fh *fhandle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | { |
| 733 | struct nfs_delegation *delegation; |
| 734 | struct inode *res = NULL; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 735 | |
| 736 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 737 | spin_lock(&delegation->lock); |
| 738 | if (delegation->inode != NULL && |
| 739 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | res = igrab(delegation->inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | } |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 742 | spin_unlock(&delegation->lock); |
| 743 | if (res != NULL) |
| 744 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | } |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 746 | return res; |
| 747 | } |
| 748 | |
| 749 | /** |
| 750 | * nfs_delegation_find_inode - retrieve the inode associated with a delegation |
| 751 | * @clp: client state handle |
| 752 | * @fhandle: filehandle from a delegation recall |
| 753 | * |
| 754 | * Returns pointer to inode matching "fhandle," or NULL if a matching inode |
| 755 | * cannot be found. |
| 756 | */ |
| 757 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, |
| 758 | const struct nfs_fh *fhandle) |
| 759 | { |
| 760 | struct nfs_server *server; |
| 761 | struct inode *res = NULL; |
| 762 | |
| 763 | rcu_read_lock(); |
| 764 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| 765 | res = nfs_delegation_find_inode_server(server, fhandle); |
| 766 | if (res != NULL) |
| 767 | break; |
| 768 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 769 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | return res; |
| 771 | } |
| 772 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 773 | static void nfs_delegation_mark_reclaim_server(struct nfs_server *server) |
| 774 | { |
| 775 | struct nfs_delegation *delegation; |
| 776 | |
| 777 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) |
| 778 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
| 779 | } |
| 780 | |
| 781 | /** |
| 782 | * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed |
| 783 | * @clp: nfs_client to process |
| 784 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | */ |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 786 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 788 | struct nfs_server *server; |
| 789 | |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 790 | rcu_read_lock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 791 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| 792 | nfs_delegation_mark_reclaim_server(server); |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 793 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | } |
| 795 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 796 | /** |
| 797 | * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done |
| 798 | * @clp: nfs_client to process |
| 799 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | */ |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 801 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | { |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 803 | struct nfs_delegation *delegation; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 804 | struct nfs_server *server; |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 805 | struct inode *inode; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 806 | |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 807 | restart: |
| 808 | rcu_read_lock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 809 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| 810 | list_for_each_entry_rcu(delegation, &server->delegations, |
| 811 | super_list) { |
| 812 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, |
| 813 | &delegation->flags) == 0) |
| 814 | continue; |
| 815 | inode = nfs_delegation_grab_inode(delegation); |
| 816 | if (inode == NULL) |
| 817 | continue; |
| 818 | delegation = nfs_detach_delegation(NFS_I(inode), |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 819 | delegation, server); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 820 | rcu_read_unlock(); |
| 821 | |
| 822 | if (delegation != NULL) |
| 823 | nfs_free_delegation(delegation); |
| 824 | iput(inode); |
| 825 | goto restart; |
| 826 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 828 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | } |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 830 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 831 | /** |
| 832 | * nfs_delegations_present - check for existence of delegations |
| 833 | * @clp: client state handle |
| 834 | * |
| 835 | * Returns one if there are any nfs_delegation structures attached |
| 836 | * to this nfs_client. |
| 837 | */ |
| 838 | int nfs_delegations_present(struct nfs_client *clp) |
| 839 | { |
| 840 | struct nfs_server *server; |
| 841 | int ret = 0; |
| 842 | |
| 843 | rcu_read_lock(); |
| 844 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| 845 | if (!list_empty(&server->delegations)) { |
| 846 | ret = 1; |
| 847 | break; |
| 848 | } |
| 849 | rcu_read_unlock(); |
| 850 | return ret; |
| 851 | } |
| 852 | |
| 853 | /** |
| 854 | * nfs4_copy_delegation_stateid - Copy inode's state ID information |
| 855 | * @dst: stateid data structure to fill in |
| 856 | * @inode: inode to check |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 857 | * @flags: delegation type requirement |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 858 | * |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 859 | * Returns "true" and fills in "dst->data" * if inode had a delegation, |
| 860 | * otherwise "false" is returned. |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 861 | */ |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 862 | bool nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode, |
| 863 | fmode_t flags) |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 864 | { |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 865 | struct nfs_inode *nfsi = NFS_I(inode); |
| 866 | struct nfs_delegation *delegation; |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 867 | bool ret; |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 868 | |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 869 | flags &= FMODE_READ|FMODE_WRITE; |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 870 | rcu_read_lock(); |
| 871 | delegation = rcu_dereference(nfsi->delegation); |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 872 | ret = (delegation != NULL && (delegation->type & flags) == flags); |
| 873 | if (ret) { |
Trond Myklebust | f597c53 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 874 | nfs4_stateid_copy(dst, &delegation->stateid); |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 875 | nfs_mark_delegation_referenced(delegation); |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 876 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 877 | rcu_read_unlock(); |
| 878 | return ret; |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 879 | } |