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 | |
Trond Myklebust | aa05c87 | 2016-09-22 13:38:54 -0400 | [diff] [blame] | 44 | static bool |
| 45 | nfs4_is_valid_delegation(const struct nfs_delegation *delegation, |
| 46 | fmode_t flags) |
| 47 | { |
| 48 | if (delegation != NULL && (delegation->type & flags) == flags && |
| 49 | !test_bit(NFS_DELEGATION_REVOKED, &delegation->flags) && |
| 50 | !test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) |
| 51 | return true; |
| 52 | return false; |
| 53 | } |
| 54 | |
Trond Myklebust | 7fe8d15 | 2019-10-31 18:40:32 -0400 | [diff] [blame] | 55 | struct nfs_delegation *nfs4_get_valid_delegation(const struct inode *inode) |
| 56 | { |
| 57 | struct nfs_delegation *delegation; |
| 58 | |
| 59 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
| 60 | if (nfs4_is_valid_delegation(delegation, 0)) |
| 61 | return delegation; |
| 62 | return NULL; |
| 63 | } |
| 64 | |
Peng Tao | 15bb3af | 2014-07-03 13:05:00 +0800 | [diff] [blame] | 65 | static int |
| 66 | nfs4_do_check_delegation(struct inode *inode, fmode_t flags, bool mark) |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 67 | { |
| 68 | struct nfs_delegation *delegation; |
| 69 | int ret = 0; |
| 70 | |
| 71 | flags &= FMODE_READ|FMODE_WRITE; |
| 72 | rcu_read_lock(); |
| 73 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
Trond Myklebust | aa05c87 | 2016-09-22 13:38:54 -0400 | [diff] [blame] | 74 | if (nfs4_is_valid_delegation(delegation, flags)) { |
Peng Tao | 15bb3af | 2014-07-03 13:05:00 +0800 | [diff] [blame] | 75 | if (mark) |
| 76 | nfs_mark_delegation_referenced(delegation); |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 77 | ret = 1; |
| 78 | } |
| 79 | rcu_read_unlock(); |
| 80 | return ret; |
| 81 | } |
Peng Tao | 15bb3af | 2014-07-03 13:05:00 +0800 | [diff] [blame] | 82 | /** |
| 83 | * nfs_have_delegation - check if inode has a delegation, mark it |
| 84 | * NFS_DELEGATION_REFERENCED if there is one. |
| 85 | * @inode: inode to check |
| 86 | * @flags: delegation types to check for |
| 87 | * |
| 88 | * Returns one if inode has the indicated delegation, otherwise zero. |
| 89 | */ |
| 90 | int nfs4_have_delegation(struct inode *inode, fmode_t flags) |
| 91 | { |
| 92 | return nfs4_do_check_delegation(inode, flags, true); |
| 93 | } |
| 94 | |
| 95 | /* |
| 96 | * nfs4_check_delegation - check if inode has a delegation, do not mark |
| 97 | * NFS_DELEGATION_REFERENCED if it has one. |
| 98 | */ |
| 99 | int nfs4_check_delegation(struct inode *inode, fmode_t flags) |
| 100 | { |
| 101 | return nfs4_do_check_delegation(inode, flags, false); |
| 102 | } |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 103 | |
Olga Kornievskaia | 7b98c74 | 2018-10-04 14:45:00 -0400 | [diff] [blame^] | 104 | static int nfs_delegation_claim_locks(struct nfs4_state *state, const nfs4_stateid *stateid) |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 105 | { |
| 106 | struct inode *inode = state->inode; |
| 107 | struct file_lock *fl; |
Jeff Layton | bd61e0a | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 108 | struct file_lock_context *flctx = inode->i_flctx; |
| 109 | struct list_head *list; |
Trond Myklebust | d512220 | 2009-06-17 13:22:58 -0700 | [diff] [blame] | 110 | int status = 0; |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 111 | |
Jeff Layton | bd61e0a | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 112 | if (flctx == NULL) |
Trond Myklebust | 65b62a2 | 2013-02-07 10:54:07 -0500 | [diff] [blame] | 113 | goto out; |
Jeff Layton | 314d7cc | 2013-04-10 15:36:48 -0400 | [diff] [blame] | 114 | |
Jeff Layton | bd61e0a | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 115 | list = &flctx->flc_posix; |
Jeff Layton | 6109c85 | 2015-01-16 15:05:57 -0500 | [diff] [blame] | 116 | spin_lock(&flctx->flc_lock); |
Jeff Layton | bd61e0a | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 117 | restart: |
| 118 | list_for_each_entry(fl, list, fl_list) { |
Olga Kornievskaia | 7b98c74 | 2018-10-04 14:45:00 -0400 | [diff] [blame^] | 119 | if (nfs_file_open_context(fl->fl_file)->state != state) |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 120 | continue; |
Jeff Layton | 6109c85 | 2015-01-16 15:05:57 -0500 | [diff] [blame] | 121 | spin_unlock(&flctx->flc_lock); |
Trond Myklebust | db4f2e63 | 2013-04-01 15:56:46 -0400 | [diff] [blame] | 122 | status = nfs4_lock_delegation_recall(fl, state, stateid); |
Trond Myklebust | d512220 | 2009-06-17 13:22:58 -0700 | [diff] [blame] | 123 | if (status < 0) |
Trond Myklebust | 3f09df7 | 2009-06-17 13:23:00 -0700 | [diff] [blame] | 124 | goto out; |
Jeff Layton | 6109c85 | 2015-01-16 15:05:57 -0500 | [diff] [blame] | 125 | spin_lock(&flctx->flc_lock); |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 126 | } |
Jeff Layton | bd61e0a | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 127 | if (list == &flctx->flc_posix) { |
| 128 | list = &flctx->flc_flock; |
| 129 | goto restart; |
Jeff Layton | 5263e31 | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 130 | } |
Jeff Layton | 6109c85 | 2015-01-16 15:05:57 -0500 | [diff] [blame] | 131 | spin_unlock(&flctx->flc_lock); |
Trond Myklebust | 3f09df7 | 2009-06-17 13:23:00 -0700 | [diff] [blame] | 132 | out: |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 133 | return status; |
| 134 | } |
| 135 | |
Trond Myklebust | 24311f8 | 2015-09-20 10:50:17 -0400 | [diff] [blame] | 136 | static int nfs_delegation_claim_opens(struct inode *inode, |
| 137 | const nfs4_stateid *stateid, fmode_t type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | { |
| 139 | struct nfs_inode *nfsi = NFS_I(inode); |
| 140 | struct nfs_open_context *ctx; |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 141 | struct nfs4_state_owner *sp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | struct nfs4_state *state; |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 143 | unsigned int seq; |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 144 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
| 146 | again: |
| 147 | spin_lock(&inode->i_lock); |
| 148 | list_for_each_entry(ctx, &nfsi->open_files, list) { |
| 149 | state = ctx->state; |
| 150 | if (state == NULL) |
| 151 | continue; |
| 152 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) |
| 153 | continue; |
Trond Myklebust | f8ebf7a | 2014-10-17 23:02:52 +0300 | [diff] [blame] | 154 | if (!nfs4_valid_open_stateid(state)) |
| 155 | continue; |
Trond Myklebust | f597c53 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 156 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 157 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | get_nfs_open_context(ctx); |
| 159 | spin_unlock(&inode->i_lock); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 160 | sp = state->owner; |
Trond Myklebust | 65b62a2 | 2013-02-07 10:54:07 -0500 | [diff] [blame] | 161 | /* Block nfs4_proc_unlck */ |
| 162 | mutex_lock(&sp->so_delegreturn_mutex); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 163 | seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); |
Trond Myklebust | 24311f8 | 2015-09-20 10:50:17 -0400 | [diff] [blame] | 164 | err = nfs4_open_delegation_recall(ctx, state, stateid, type); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 165 | if (!err) |
Olga Kornievskaia | 7b98c74 | 2018-10-04 14:45:00 -0400 | [diff] [blame^] | 166 | err = nfs_delegation_claim_locks(state, stateid); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 167 | if (!err && read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) |
| 168 | err = -EAGAIN; |
Trond Myklebust | 65b62a2 | 2013-02-07 10:54:07 -0500 | [diff] [blame] | 169 | mutex_unlock(&sp->so_delegreturn_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | put_nfs_open_context(ctx); |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 171 | if (err != 0) |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 172 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | goto again; |
| 174 | } |
| 175 | spin_unlock(&inode->i_lock); |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 176 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | } |
| 178 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 179 | /** |
| 180 | * nfs_inode_reclaim_delegation - process a delegation reclaim request |
| 181 | * @inode: inode to process |
| 182 | * @cred: credential to use for request |
| 183 | * @res: new delegation state from server |
| 184 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | */ |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 186 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, |
| 187 | struct nfs_openres *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | { |
Trond Myklebust | 8f649c3 | 2010-05-01 12:36:18 -0400 | [diff] [blame] | 189 | struct nfs_delegation *delegation; |
| 190 | struct rpc_cred *oldcred = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
Trond Myklebust | 8f649c3 | 2010-05-01 12:36:18 -0400 | [diff] [blame] | 192 | rcu_read_lock(); |
| 193 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
| 194 | if (delegation != NULL) { |
| 195 | spin_lock(&delegation->lock); |
| 196 | if (delegation->inode != NULL) { |
Trond Myklebust | f597c53 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 197 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
Trond Myklebust | 8f649c3 | 2010-05-01 12:36:18 -0400 | [diff] [blame] | 198 | delegation->type = res->delegation_type; |
Trond Myklebust | 7d160a6 | 2015-09-05 19:06:57 -0400 | [diff] [blame] | 199 | delegation->pagemod_limit = res->pagemod_limit; |
Trond Myklebust | 8f649c3 | 2010-05-01 12:36:18 -0400 | [diff] [blame] | 200 | oldcred = delegation->cred; |
| 201 | delegation->cred = get_rpccred(cred); |
| 202 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, |
| 203 | &delegation->flags); |
Trond Myklebust | 8f649c3 | 2010-05-01 12:36:18 -0400 | [diff] [blame] | 204 | spin_unlock(&delegation->lock); |
Trond Myklebust | 8f649c3 | 2010-05-01 12:36:18 -0400 | [diff] [blame] | 205 | rcu_read_unlock(); |
Trond Myklebust | 7c0af9f | 2015-02-26 12:54:46 -0500 | [diff] [blame] | 206 | put_rpccred(oldcred); |
Trond Myklebust | ca8acf8 | 2013-08-13 10:36:56 -0400 | [diff] [blame] | 207 | trace_nfs4_reclaim_delegation(inode, res->delegation_type); |
Trond Myklebust | b1a318d | 2016-09-22 13:39:12 -0400 | [diff] [blame] | 208 | return; |
Trond Myklebust | 8f649c3 | 2010-05-01 12:36:18 -0400 | [diff] [blame] | 209 | } |
Trond Myklebust | b1a318d | 2016-09-22 13:39:12 -0400 | [diff] [blame] | 210 | /* We appear to have raced with a delegation return. */ |
| 211 | spin_unlock(&delegation->lock); |
Trond Myklebust | 8f649c3 | 2010-05-01 12:36:18 -0400 | [diff] [blame] | 212 | } |
Trond Myklebust | b1a318d | 2016-09-22 13:39:12 -0400 | [diff] [blame] | 213 | rcu_read_unlock(); |
| 214 | nfs_inode_set_delegation(inode, cred, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | } |
| 216 | |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 217 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
| 218 | { |
| 219 | int res = 0; |
| 220 | |
Trond Myklebust | 869f9df | 2014-11-10 18:43:56 -0500 | [diff] [blame] | 221 | if (!test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) |
| 222 | res = nfs4_proc_delegreturn(inode, |
| 223 | delegation->cred, |
| 224 | &delegation->stateid, |
| 225 | issync); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 226 | nfs_free_delegation(delegation); |
| 227 | return res; |
| 228 | } |
| 229 | |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 230 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
| 231 | { |
| 232 | struct inode *inode = NULL; |
| 233 | |
| 234 | spin_lock(&delegation->lock); |
| 235 | if (delegation->inode != NULL) |
| 236 | inode = igrab(delegation->inode); |
| 237 | spin_unlock(&delegation->lock); |
| 238 | return inode; |
| 239 | } |
| 240 | |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 241 | static struct nfs_delegation * |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 242 | nfs_start_delegation_return_locked(struct nfs_inode *nfsi) |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 243 | { |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 244 | struct nfs_delegation *ret = NULL; |
| 245 | struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 246 | |
| 247 | if (delegation == NULL) |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 248 | goto out; |
| 249 | spin_lock(&delegation->lock); |
| 250 | if (!test_and_set_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) |
| 251 | ret = delegation; |
| 252 | spin_unlock(&delegation->lock); |
| 253 | out: |
| 254 | return ret; |
| 255 | } |
| 256 | |
| 257 | static struct nfs_delegation * |
| 258 | nfs_start_delegation_return(struct nfs_inode *nfsi) |
| 259 | { |
| 260 | struct nfs_delegation *delegation; |
| 261 | |
| 262 | rcu_read_lock(); |
| 263 | delegation = nfs_start_delegation_return_locked(nfsi); |
| 264 | rcu_read_unlock(); |
| 265 | return delegation; |
| 266 | } |
| 267 | |
| 268 | static void |
| 269 | nfs_abort_delegation_return(struct nfs_delegation *delegation, |
| 270 | struct nfs_client *clp) |
| 271 | { |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 272 | |
Trond Myklebust | 3431043 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 273 | spin_lock(&delegation->lock); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 274 | clear_bit(NFS_DELEGATION_RETURNING, &delegation->flags); |
| 275 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
| 276 | spin_unlock(&delegation->lock); |
| 277 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); |
| 278 | } |
| 279 | |
| 280 | static struct nfs_delegation * |
| 281 | nfs_detach_delegation_locked(struct nfs_inode *nfsi, |
| 282 | struct nfs_delegation *delegation, |
| 283 | struct nfs_client *clp) |
| 284 | { |
| 285 | struct nfs_delegation *deleg_cur = |
| 286 | rcu_dereference_protected(nfsi->delegation, |
| 287 | lockdep_is_held(&clp->cl_lock)); |
| 288 | |
| 289 | if (deleg_cur == NULL || delegation != deleg_cur) |
| 290 | return NULL; |
| 291 | |
| 292 | spin_lock(&delegation->lock); |
| 293 | set_bit(NFS_DELEGATION_RETURNING, &delegation->flags); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 294 | list_del_rcu(&delegation->super_list); |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 295 | delegation->inode = NULL; |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 296 | rcu_assign_pointer(nfsi->delegation, NULL); |
Trond Myklebust | 3431043 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 297 | spin_unlock(&delegation->lock); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 298 | return delegation; |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 299 | } |
| 300 | |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 301 | static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi, |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 302 | struct nfs_delegation *delegation, |
| 303 | struct nfs_server *server) |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 304 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 305 | struct nfs_client *clp = server->nfs_client; |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 306 | |
| 307 | spin_lock(&clp->cl_lock); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 308 | delegation = nfs_detach_delegation_locked(nfsi, delegation, clp); |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 309 | spin_unlock(&clp->cl_lock); |
| 310 | return delegation; |
| 311 | } |
| 312 | |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 313 | static struct nfs_delegation * |
| 314 | nfs_inode_detach_delegation(struct inode *inode) |
| 315 | { |
| 316 | struct nfs_inode *nfsi = NFS_I(inode); |
| 317 | struct nfs_server *server = NFS_SERVER(inode); |
| 318 | struct nfs_delegation *delegation; |
| 319 | |
| 320 | delegation = nfs_start_delegation_return(nfsi); |
| 321 | if (delegation == NULL) |
| 322 | return NULL; |
| 323 | return nfs_detach_delegation(nfsi, delegation, server); |
| 324 | } |
| 325 | |
Trond Myklebust | cf6726e | 2014-12-19 11:22:28 -0500 | [diff] [blame] | 326 | static void |
| 327 | nfs_update_inplace_delegation(struct nfs_delegation *delegation, |
| 328 | const struct nfs_delegation *update) |
| 329 | { |
| 330 | if (nfs4_stateid_is_newer(&update->stateid, &delegation->stateid)) { |
| 331 | delegation->stateid.seqid = update->stateid.seqid; |
| 332 | smp_wmb(); |
| 333 | delegation->type = update->type; |
| 334 | } |
| 335 | } |
| 336 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 337 | /** |
| 338 | * nfs_inode_set_delegation - set up a delegation on an inode |
| 339 | * @inode: inode to which delegation applies |
| 340 | * @cred: cred to use for subsequent delegation processing |
| 341 | * @res: new delegation state from server |
| 342 | * |
| 343 | * Returns zero on success, or a negative errno value. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | */ |
| 345 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) |
| 346 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 347 | struct nfs_server *server = NFS_SERVER(inode); |
| 348 | struct nfs_client *clp = server->nfs_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | struct nfs_inode *nfsi = NFS_I(inode); |
David Howells | 17d2c0a | 2010-05-01 12:37:18 -0400 | [diff] [blame] | 350 | struct nfs_delegation *delegation, *old_delegation; |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 351 | struct nfs_delegation *freeme = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | int status = 0; |
| 353 | |
Trond Myklebust | 8535b2b | 2010-05-13 12:51:01 -0400 | [diff] [blame] | 354 | delegation = kmalloc(sizeof(*delegation), GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | if (delegation == NULL) |
| 356 | return -ENOMEM; |
Trond Myklebust | f597c53 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 357 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | delegation->type = res->delegation_type; |
Trond Myklebust | 7d160a6 | 2015-09-05 19:06:57 -0400 | [diff] [blame] | 359 | delegation->pagemod_limit = res->pagemod_limit; |
Trond Myklebust | a9a4a87 | 2011-10-17 16:08:46 -0700 | [diff] [blame] | 360 | delegation->change_attr = inode->i_version; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | delegation->cred = get_rpccred(cred); |
| 362 | delegation->inode = inode; |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 363 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
Trond Myklebust | 3431043 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 364 | spin_lock_init(&delegation->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
| 366 | spin_lock(&clp->cl_lock); |
David Howells | 17d2c0a | 2010-05-01 12:37:18 -0400 | [diff] [blame] | 367 | old_delegation = rcu_dereference_protected(nfsi->delegation, |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 368 | lockdep_is_held(&clp->cl_lock)); |
David Howells | 17d2c0a | 2010-05-01 12:37:18 -0400 | [diff] [blame] | 369 | if (old_delegation != NULL) { |
Trond Myklebust | cf6726e | 2014-12-19 11:22:28 -0500 | [diff] [blame] | 370 | /* Is this an update of the existing delegation? */ |
| 371 | if (nfs4_stateid_match_other(&old_delegation->stateid, |
| 372 | &delegation->stateid)) { |
| 373 | nfs_update_inplace_delegation(old_delegation, |
| 374 | delegation); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 375 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | } |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 377 | /* |
| 378 | * Deal with broken servers that hand out two |
| 379 | * delegations for the same file. |
Trond Myklebust | 1728017 | 2012-03-11 13:11:00 -0400 | [diff] [blame] | 380 | * Allow for upgrades to a WRITE delegation, but |
| 381 | * nothing else. |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 382 | */ |
| 383 | dfprintk(FILE, "%s: server %s handed out " |
| 384 | "a duplicate delegation!\n", |
Harvey Harrison | 3110ff8 | 2008-05-02 13:42:44 -0700 | [diff] [blame] | 385 | __func__, clp->cl_hostname); |
Trond Myklebust | 1728017 | 2012-03-11 13:11:00 -0400 | [diff] [blame] | 386 | if (delegation->type == old_delegation->type || |
| 387 | !(delegation->type & FMODE_WRITE)) { |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 388 | freeme = delegation; |
| 389 | delegation = NULL; |
| 390 | goto out; |
| 391 | } |
Trond Myklebust | ade0464 | 2015-02-27 14:25:50 -0500 | [diff] [blame] | 392 | if (test_and_set_bit(NFS_DELEGATION_RETURNING, |
| 393 | &old_delegation->flags)) |
| 394 | goto out; |
| 395 | freeme = nfs_detach_delegation_locked(nfsi, |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 396 | old_delegation, clp); |
| 397 | if (freeme == NULL) |
| 398 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | } |
Trond Myklebust | 38942ba | 2015-03-04 15:59:05 -0500 | [diff] [blame] | 400 | list_add_tail_rcu(&delegation->super_list, &server->delegations); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 401 | rcu_assign_pointer(nfsi->delegation, delegation); |
| 402 | delegation = NULL; |
Trond Myklebust | 412c77c | 2007-07-03 16:10:55 -0400 | [diff] [blame] | 403 | |
| 404 | /* Ensure we revalidate the attributes and page cache! */ |
| 405 | spin_lock(&inode->i_lock); |
| 406 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; |
| 407 | spin_unlock(&inode->i_lock); |
Trond Myklebust | ca8acf8 | 2013-08-13 10:36:56 -0400 | [diff] [blame] | 408 | trace_nfs4_set_delegation(inode, res->delegation_type); |
Trond Myklebust | 412c77c | 2007-07-03 16:10:55 -0400 | [diff] [blame] | 409 | |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 410 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | 603c83d | 2007-10-18 19:59:20 -0400 | [diff] [blame] | 412 | if (delegation != NULL) |
| 413 | nfs_free_delegation(delegation); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 414 | if (freeme != NULL) |
| 415 | nfs_do_return_delegation(inode, freeme, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | return status; |
| 417 | } |
| 418 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | /* |
| 420 | * Basic procedure for returning a delegation to the server |
| 421 | */ |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 422 | 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] | 423 | { |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 424 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | struct nfs_inode *nfsi = NFS_I(inode); |
Trond Myklebust | 869f9df | 2014-11-10 18:43:56 -0500 | [diff] [blame] | 426 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 428 | if (delegation == NULL) |
| 429 | return 0; |
| 430 | do { |
Trond Myklebust | 869f9df | 2014-11-10 18:43:56 -0500 | [diff] [blame] | 431 | if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) |
| 432 | break; |
Trond Myklebust | 24311f8 | 2015-09-20 10:50:17 -0400 | [diff] [blame] | 433 | err = nfs_delegation_claim_opens(inode, &delegation->stateid, |
| 434 | delegation->type); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 435 | if (!issync || err != -EAGAIN) |
| 436 | break; |
| 437 | /* |
| 438 | * Guard against state recovery |
| 439 | */ |
| 440 | err = nfs4_wait_clnt_recover(clp); |
| 441 | } while (err == 0); |
| 442 | |
| 443 | if (err) { |
| 444 | nfs_abort_delegation_return(delegation, clp); |
| 445 | goto out; |
| 446 | } |
| 447 | if (!nfs_detach_delegation(nfsi, delegation, NFS_SERVER(inode))) |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 448 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 450 | err = nfs_do_return_delegation(inode, delegation, issync); |
| 451 | out: |
| 452 | return err; |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 453 | } |
| 454 | |
Trond Myklebust | b757144 | 2013-04-03 14:33:49 -0400 | [diff] [blame] | 455 | static bool nfs_delegation_need_return(struct nfs_delegation *delegation) |
| 456 | { |
| 457 | bool ret = false; |
| 458 | |
Trond Myklebust | ec3ca4e | 2015-02-26 14:05:05 -0500 | [diff] [blame] | 459 | if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) |
| 460 | goto out; |
Trond Myklebust | b757144 | 2013-04-03 14:33:49 -0400 | [diff] [blame] | 461 | if (test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags)) |
| 462 | ret = true; |
| 463 | if (test_and_clear_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags) && !ret) { |
| 464 | struct inode *inode; |
| 465 | |
| 466 | spin_lock(&delegation->lock); |
| 467 | inode = delegation->inode; |
| 468 | if (inode && list_empty(&NFS_I(inode)->open_files)) |
| 469 | ret = true; |
| 470 | spin_unlock(&delegation->lock); |
| 471 | } |
Trond Myklebust | ec3ca4e | 2015-02-26 14:05:05 -0500 | [diff] [blame] | 472 | out: |
Trond Myklebust | b757144 | 2013-04-03 14:33:49 -0400 | [diff] [blame] | 473 | return ret; |
| 474 | } |
| 475 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 476 | /** |
| 477 | * nfs_client_return_marked_delegations - return previously marked delegations |
| 478 | * @clp: nfs_client to process |
| 479 | * |
Trond Myklebust | dc327ed | 2012-05-06 19:46:30 -0400 | [diff] [blame] | 480 | * Note that this function is designed to be called by the state |
| 481 | * manager thread. For this reason, it cannot flush the dirty data, |
| 482 | * since that could deadlock in case of a state recovery error. |
| 483 | * |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 484 | * Returns zero on success, or a negative errno value. |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 485 | */ |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 486 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 487 | { |
| 488 | struct nfs_delegation *delegation; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 489 | struct nfs_server *server; |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 490 | struct inode *inode; |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 491 | int err = 0; |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 492 | |
| 493 | restart: |
| 494 | rcu_read_lock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 495 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| 496 | list_for_each_entry_rcu(delegation, &server->delegations, |
| 497 | super_list) { |
Trond Myklebust | b757144 | 2013-04-03 14:33:49 -0400 | [diff] [blame] | 498 | if (!nfs_delegation_need_return(delegation)) |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 499 | continue; |
Trond Myklebust | 9f0f8e1 | 2015-02-26 09:57:34 -0500 | [diff] [blame] | 500 | if (!nfs_sb_active(server->super)) |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 501 | continue; |
Trond Myklebust | 9f0f8e1 | 2015-02-26 09:57:34 -0500 | [diff] [blame] | 502 | inode = nfs_delegation_grab_inode(delegation); |
| 503 | if (inode == NULL) { |
| 504 | rcu_read_unlock(); |
| 505 | nfs_sb_deactive(server->super); |
| 506 | goto restart; |
| 507 | } |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 508 | delegation = nfs_start_delegation_return_locked(NFS_I(inode)); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 509 | rcu_read_unlock(); |
| 510 | |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 511 | err = nfs_end_delegation_return(inode, delegation, 0); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 512 | iput(inode); |
Trond Myklebust | 9f0f8e1 | 2015-02-26 09:57:34 -0500 | [diff] [blame] | 513 | nfs_sb_deactive(server->super); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 514 | if (!err) |
| 515 | goto restart; |
| 516 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); |
| 517 | return err; |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 518 | } |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 519 | } |
| 520 | rcu_read_unlock(); |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 521 | return 0; |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 522 | } |
| 523 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 524 | /** |
| 525 | * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens |
| 526 | * @inode: inode to process |
| 527 | * |
| 528 | * Does not protect against delegation reclaims, therefore really only safe |
| 529 | * to be called from nfs4_clear_inode(). |
Trond Myklebust | e6f8107 | 2008-01-24 18:14:34 -0500 | [diff] [blame] | 530 | */ |
| 531 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) |
| 532 | { |
Trond Myklebust | e6f8107 | 2008-01-24 18:14:34 -0500 | [diff] [blame] | 533 | struct nfs_delegation *delegation; |
| 534 | |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 535 | delegation = nfs_inode_detach_delegation(inode); |
| 536 | if (delegation != NULL) |
Trond Myklebust | 5fcdfac | 2015-03-25 13:19:42 -0400 | [diff] [blame] | 537 | nfs_do_return_delegation(inode, delegation, 1); |
Trond Myklebust | e6f8107 | 2008-01-24 18:14:34 -0500 | [diff] [blame] | 538 | } |
| 539 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 540 | /** |
| 541 | * nfs_inode_return_delegation - synchronously return a delegation |
| 542 | * @inode: inode to process |
| 543 | * |
Trond Myklebust | c57d1bc | 2012-05-06 19:34:17 -0400 | [diff] [blame] | 544 | * This routine will always flush any dirty data to disk on the |
| 545 | * assumption that if we need to return the delegation, then |
| 546 | * we should stop caching. |
| 547 | * |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 548 | * Returns zero on success, or a negative errno value. |
| 549 | */ |
Bryan Schumaker | 57ec14c | 2012-06-20 15:53:44 -0400 | [diff] [blame] | 550 | int nfs4_inode_return_delegation(struct inode *inode) |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 551 | { |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 552 | struct nfs_inode *nfsi = NFS_I(inode); |
| 553 | struct nfs_delegation *delegation; |
| 554 | int err = 0; |
| 555 | |
Trond Myklebust | c57d1bc | 2012-05-06 19:34:17 -0400 | [diff] [blame] | 556 | nfs_wb_all(inode); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 557 | delegation = nfs_start_delegation_return(nfsi); |
| 558 | if (delegation != NULL) |
| 559 | err = nfs_end_delegation_return(inode, delegation, 1); |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 560 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | } |
| 562 | |
Trond Myklebust | b757144 | 2013-04-03 14:33:49 -0400 | [diff] [blame] | 563 | static void nfs_mark_return_if_closed_delegation(struct nfs_server *server, |
| 564 | struct nfs_delegation *delegation) |
| 565 | { |
| 566 | set_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags); |
| 567 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); |
| 568 | } |
| 569 | |
Trond Myklebust | ed1e621 | 2011-07-25 15:37:29 -0400 | [diff] [blame] | 570 | static void nfs_mark_return_delegation(struct nfs_server *server, |
| 571 | struct nfs_delegation *delegation) |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 572 | { |
| 573 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
Trond Myklebust | ed1e621 | 2011-07-25 15:37:29 -0400 | [diff] [blame] | 574 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 575 | } |
| 576 | |
Trond Myklebust | 5c31e23 | 2013-04-03 19:04:58 -0400 | [diff] [blame] | 577 | static bool nfs_server_mark_return_all_delegations(struct nfs_server *server) |
| 578 | { |
| 579 | struct nfs_delegation *delegation; |
| 580 | bool ret = false; |
| 581 | |
| 582 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
| 583 | nfs_mark_return_delegation(server, delegation); |
| 584 | ret = true; |
| 585 | } |
| 586 | return ret; |
| 587 | } |
| 588 | |
Trond Myklebust | b02ba0b | 2013-04-03 19:23:58 -0400 | [diff] [blame] | 589 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
| 590 | { |
| 591 | struct nfs_server *server; |
| 592 | |
| 593 | rcu_read_lock(); |
| 594 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| 595 | nfs_server_mark_return_all_delegations(server); |
| 596 | rcu_read_unlock(); |
| 597 | } |
| 598 | |
| 599 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) |
| 600 | { |
| 601 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) |
| 602 | nfs4_schedule_state_manager(clp); |
| 603 | } |
| 604 | |
| 605 | /** |
| 606 | * nfs_expire_all_delegations |
| 607 | * @clp: client to process |
| 608 | * |
| 609 | */ |
| 610 | void nfs_expire_all_delegations(struct nfs_client *clp) |
| 611 | { |
| 612 | nfs_client_mark_return_all_delegations(clp); |
| 613 | nfs_delegation_run_state_manager(clp); |
| 614 | } |
| 615 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 616 | /** |
| 617 | * nfs_super_return_all_delegations - return delegations for one superblock |
| 618 | * @sb: sb to process |
| 619 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | */ |
Bryan Schumaker | eeebf91 | 2012-06-20 15:53:41 -0400 | [diff] [blame] | 621 | void nfs_server_return_all_delegations(struct nfs_server *server) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 623 | struct nfs_client *clp = server->nfs_client; |
Trond Myklebust | 5c31e23 | 2013-04-03 19:04:58 -0400 | [diff] [blame] | 624 | bool need_wait; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
| 626 | if (clp == NULL) |
| 627 | return; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 628 | |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 629 | rcu_read_lock(); |
Trond Myklebust | 5c31e23 | 2013-04-03 19:04:58 -0400 | [diff] [blame] | 630 | need_wait = nfs_server_mark_return_all_delegations(server); |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 631 | rcu_read_unlock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 632 | |
Trond Myklebust | 5c31e23 | 2013-04-03 19:04:58 -0400 | [diff] [blame] | 633 | if (need_wait) { |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 634 | nfs4_schedule_state_manager(clp); |
Trond Myklebust | 5c31e23 | 2013-04-03 19:04:58 -0400 | [diff] [blame] | 635 | nfs4_wait_clnt_recover(clp); |
| 636 | } |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 637 | } |
| 638 | |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 639 | static void nfs_mark_return_unused_delegation_types(struct nfs_server *server, |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 640 | fmode_t flags) |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 641 | { |
| 642 | struct nfs_delegation *delegation; |
| 643 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 644 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
Alexandros Batsakis | c79571a | 2009-12-05 13:20:52 -0500 | [diff] [blame] | 645 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
| 646 | continue; |
| 647 | if (delegation->type & flags) |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 648 | nfs_mark_return_if_closed_delegation(server, delegation); |
Trond Myklebust | 707fb4b | 2008-12-23 15:21:47 -0500 | [diff] [blame] | 649 | } |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 650 | } |
| 651 | |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 652 | 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] | 653 | fmode_t flags) |
| 654 | { |
| 655 | struct nfs_server *server; |
| 656 | |
| 657 | rcu_read_lock(); |
| 658 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 659 | nfs_mark_return_unused_delegation_types(server, flags); |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 660 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | } |
| 662 | |
Trond Myklebust | 41020b6 | 2016-09-22 13:38:58 -0400 | [diff] [blame] | 663 | static void nfs_mark_delegation_revoked(struct nfs_server *server, |
| 664 | struct nfs_delegation *delegation) |
Trond Myklebust | 869f9df | 2014-11-10 18:43:56 -0500 | [diff] [blame] | 665 | { |
Trond Myklebust | 41020b6 | 2016-09-22 13:38:58 -0400 | [diff] [blame] | 666 | set_bit(NFS_DELEGATION_REVOKED, &delegation->flags); |
Trond Myklebust | 059b43e | 2016-09-22 13:39:06 -0400 | [diff] [blame] | 667 | delegation->stateid.type = NFS4_INVALID_STATEID_TYPE; |
Trond Myklebust | 41020b6 | 2016-09-22 13:38:58 -0400 | [diff] [blame] | 668 | nfs_mark_return_delegation(server, delegation); |
Trond Myklebust | 869f9df | 2014-11-10 18:43:56 -0500 | [diff] [blame] | 669 | } |
| 670 | |
Trond Myklebust | 41020b6 | 2016-09-22 13:38:58 -0400 | [diff] [blame] | 671 | static bool nfs_revoke_delegation(struct inode *inode, |
| 672 | const nfs4_stateid *stateid) |
| 673 | { |
| 674 | struct nfs_delegation *delegation; |
Trond Myklebust | 7f04883 | 2016-09-22 13:39:14 -0400 | [diff] [blame] | 675 | nfs4_stateid tmp; |
Trond Myklebust | 41020b6 | 2016-09-22 13:38:58 -0400 | [diff] [blame] | 676 | bool ret = false; |
| 677 | |
| 678 | rcu_read_lock(); |
| 679 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
| 680 | if (delegation == NULL) |
| 681 | goto out; |
Trond Myklebust | 7f04883 | 2016-09-22 13:39:14 -0400 | [diff] [blame] | 682 | if (stateid == NULL) { |
| 683 | nfs4_stateid_copy(&tmp, &delegation->stateid); |
| 684 | stateid = &tmp; |
| 685 | } else if (!nfs4_stateid_match(stateid, &delegation->stateid)) |
Trond Myklebust | 41020b6 | 2016-09-22 13:38:58 -0400 | [diff] [blame] | 686 | goto out; |
| 687 | nfs_mark_delegation_revoked(NFS_SERVER(inode), delegation); |
| 688 | ret = true; |
| 689 | out: |
| 690 | rcu_read_unlock(); |
Trond Myklebust | 7f04883 | 2016-09-22 13:39:14 -0400 | [diff] [blame] | 691 | if (ret) |
| 692 | nfs_inode_find_state_and_recover(inode, stateid); |
Trond Myklebust | 41020b6 | 2016-09-22 13:38:58 -0400 | [diff] [blame] | 693 | return ret; |
| 694 | } |
| 695 | |
| 696 | void nfs_remove_bad_delegation(struct inode *inode, |
| 697 | const nfs4_stateid *stateid) |
Trond Myklebust | a1d0b5e | 2012-03-05 19:56:44 -0500 | [diff] [blame] | 698 | { |
| 699 | struct nfs_delegation *delegation; |
| 700 | |
Trond Myklebust | 41020b6 | 2016-09-22 13:38:58 -0400 | [diff] [blame] | 701 | if (!nfs_revoke_delegation(inode, stateid)) |
| 702 | return; |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 703 | delegation = nfs_inode_detach_delegation(inode); |
Trond Myklebust | 7f04883 | 2016-09-22 13:39:14 -0400 | [diff] [blame] | 704 | if (delegation) |
Trond Myklebust | a1d0b5e | 2012-03-05 19:56:44 -0500 | [diff] [blame] | 705 | nfs_free_delegation(delegation); |
Trond Myklebust | a1d0b5e | 2012-03-05 19:56:44 -0500 | [diff] [blame] | 706 | } |
Andy Adamson | 9cb8196 | 2012-03-07 10:49:41 -0500 | [diff] [blame] | 707 | EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation); |
Trond Myklebust | a1d0b5e | 2012-03-05 19:56:44 -0500 | [diff] [blame] | 708 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 709 | /** |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 710 | * nfs_expire_unused_delegation_types |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 711 | * @clp: client to process |
| 712 | * @flags: delegation types to expire |
| 713 | * |
| 714 | */ |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 715 | 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] | 716 | { |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 717 | nfs_client_mark_return_unused_delegation_types(clp, flags); |
Alexandros Batsakis | c79571a | 2009-12-05 13:20:52 -0500 | [diff] [blame] | 718 | nfs_delegation_run_state_manager(clp); |
| 719 | } |
| 720 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 721 | static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server) |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 722 | { |
| 723 | struct nfs_delegation *delegation; |
| 724 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 725 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 726 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) |
| 727 | continue; |
Trond Myklebust | b757144 | 2013-04-03 14:33:49 -0400 | [diff] [blame] | 728 | nfs_mark_return_if_closed_delegation(server, delegation); |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 729 | } |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 730 | } |
| 731 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 732 | /** |
| 733 | * nfs_expire_unreferenced_delegations - Eliminate unused delegations |
| 734 | * @clp: nfs_client to process |
| 735 | * |
| 736 | */ |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 737 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) |
| 738 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 739 | struct nfs_server *server; |
| 740 | |
| 741 | rcu_read_lock(); |
| 742 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| 743 | nfs_mark_return_unreferenced_delegations(server); |
| 744 | rcu_read_unlock(); |
| 745 | |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 746 | nfs_delegation_run_state_manager(clp); |
| 747 | } |
| 748 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 749 | /** |
| 750 | * nfs_async_inode_return_delegation - asynchronously return a delegation |
| 751 | * @inode: inode to process |
Trond Myklebust | 8e663f0 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 752 | * @stateid: state ID information |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 753 | * |
| 754 | * Returns zero on success, or a negative errno value. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | */ |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 756 | int nfs_async_inode_return_delegation(struct inode *inode, |
| 757 | const nfs4_stateid *stateid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | { |
Trond Myklebust | ed1e621 | 2011-07-25 15:37:29 -0400 | [diff] [blame] | 759 | struct nfs_server *server = NFS_SERVER(inode); |
| 760 | struct nfs_client *clp = server->nfs_client; |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 761 | struct nfs_delegation *delegation; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 763 | rcu_read_lock(); |
| 764 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
Trond Myklebust | 755a48a | 2014-03-02 22:03:12 -0500 | [diff] [blame] | 765 | if (delegation == NULL) |
| 766 | goto out_enoent; |
Trond Myklebust | 4816fda | 2015-09-20 14:58:42 -0400 | [diff] [blame] | 767 | if (stateid != NULL && |
| 768 | !clp->cl_mvops->match_stateid(&delegation->stateid, stateid)) |
Trond Myklebust | 755a48a | 2014-03-02 22:03:12 -0500 | [diff] [blame] | 769 | goto out_enoent; |
Trond Myklebust | ed1e621 | 2011-07-25 15:37:29 -0400 | [diff] [blame] | 770 | nfs_mark_return_delegation(server, delegation); |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 771 | rcu_read_unlock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 772 | |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 773 | nfs_delegation_run_state_manager(clp); |
| 774 | return 0; |
Trond Myklebust | 755a48a | 2014-03-02 22:03:12 -0500 | [diff] [blame] | 775 | out_enoent: |
| 776 | rcu_read_unlock(); |
| 777 | return -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | } |
| 779 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 780 | static struct inode * |
| 781 | nfs_delegation_find_inode_server(struct nfs_server *server, |
| 782 | const struct nfs_fh *fhandle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | { |
| 784 | struct nfs_delegation *delegation; |
| 785 | struct inode *res = NULL; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 786 | |
| 787 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 788 | spin_lock(&delegation->lock); |
| 789 | if (delegation->inode != NULL && |
| 790 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | res = igrab(delegation->inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | } |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 793 | spin_unlock(&delegation->lock); |
| 794 | if (res != NULL) |
| 795 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | } |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 797 | return res; |
| 798 | } |
| 799 | |
| 800 | /** |
| 801 | * nfs_delegation_find_inode - retrieve the inode associated with a delegation |
| 802 | * @clp: client state handle |
| 803 | * @fhandle: filehandle from a delegation recall |
| 804 | * |
| 805 | * Returns pointer to inode matching "fhandle," or NULL if a matching inode |
| 806 | * cannot be found. |
| 807 | */ |
| 808 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, |
| 809 | const struct nfs_fh *fhandle) |
| 810 | { |
| 811 | struct nfs_server *server; |
| 812 | struct inode *res = NULL; |
| 813 | |
| 814 | rcu_read_lock(); |
| 815 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| 816 | res = nfs_delegation_find_inode_server(server, fhandle); |
| 817 | if (res != NULL) |
| 818 | break; |
| 819 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 820 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | return res; |
| 822 | } |
| 823 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 824 | static void nfs_delegation_mark_reclaim_server(struct nfs_server *server) |
| 825 | { |
| 826 | struct nfs_delegation *delegation; |
| 827 | |
Trond Myklebust | 45870d6 | 2016-09-22 13:38:59 -0400 | [diff] [blame] | 828 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
| 829 | /* |
| 830 | * If the delegation may have been admin revoked, then we |
| 831 | * cannot reclaim it. |
| 832 | */ |
| 833 | if (test_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags)) |
| 834 | continue; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 835 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
Trond Myklebust | 45870d6 | 2016-09-22 13:38:59 -0400 | [diff] [blame] | 836 | } |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 837 | } |
| 838 | |
| 839 | /** |
| 840 | * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed |
| 841 | * @clp: nfs_client to process |
| 842 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | */ |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 844 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 846 | struct nfs_server *server; |
| 847 | |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 848 | rcu_read_lock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 849 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| 850 | nfs_delegation_mark_reclaim_server(server); |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 851 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | } |
| 853 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 854 | /** |
| 855 | * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done |
| 856 | * @clp: nfs_client to process |
| 857 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | */ |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 859 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | { |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 861 | struct nfs_delegation *delegation; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 862 | struct nfs_server *server; |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 863 | struct inode *inode; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 864 | |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 865 | restart: |
| 866 | rcu_read_lock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 867 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| 868 | list_for_each_entry_rcu(delegation, &server->delegations, |
| 869 | super_list) { |
Trond Myklebust | ec3ca4e | 2015-02-26 14:05:05 -0500 | [diff] [blame] | 870 | if (test_bit(NFS_DELEGATION_RETURNING, |
| 871 | &delegation->flags)) |
| 872 | continue; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 873 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, |
| 874 | &delegation->flags) == 0) |
| 875 | continue; |
Trond Myklebust | 9f0f8e1 | 2015-02-26 09:57:34 -0500 | [diff] [blame] | 876 | if (!nfs_sb_active(server->super)) |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 877 | continue; |
Trond Myklebust | 9f0f8e1 | 2015-02-26 09:57:34 -0500 | [diff] [blame] | 878 | inode = nfs_delegation_grab_inode(delegation); |
| 879 | if (inode == NULL) { |
| 880 | rcu_read_unlock(); |
| 881 | nfs_sb_deactive(server->super); |
| 882 | goto restart; |
| 883 | } |
Trond Myklebust | b04b22f | 2015-02-26 13:59:38 -0500 | [diff] [blame] | 884 | delegation = nfs_start_delegation_return_locked(NFS_I(inode)); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 885 | rcu_read_unlock(); |
Trond Myklebust | b04b22f | 2015-02-26 13:59:38 -0500 | [diff] [blame] | 886 | if (delegation != NULL) { |
| 887 | delegation = nfs_detach_delegation(NFS_I(inode), |
| 888 | delegation, server); |
| 889 | if (delegation != NULL) |
| 890 | nfs_free_delegation(delegation); |
| 891 | } |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 892 | iput(inode); |
Trond Myklebust | 9f0f8e1 | 2015-02-26 09:57:34 -0500 | [diff] [blame] | 893 | nfs_sb_deactive(server->super); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 894 | goto restart; |
| 895 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 897 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | } |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 899 | |
Trond Myklebust | bb3d1a3 | 2016-09-22 13:39:00 -0400 | [diff] [blame] | 900 | static inline bool nfs4_server_rebooted(const struct nfs_client *clp) |
| 901 | { |
| 902 | return (clp->cl_state & (BIT(NFS4CLNT_CHECK_LEASE) | |
| 903 | BIT(NFS4CLNT_LEASE_EXPIRED) | |
| 904 | BIT(NFS4CLNT_SESSION_RESET))) != 0; |
| 905 | } |
| 906 | |
Trond Myklebust | 45870d6 | 2016-09-22 13:38:59 -0400 | [diff] [blame] | 907 | static void nfs_mark_test_expired_delegation(struct nfs_server *server, |
| 908 | struct nfs_delegation *delegation) |
| 909 | { |
Trond Myklebust | 059b43e | 2016-09-22 13:39:06 -0400 | [diff] [blame] | 910 | if (delegation->stateid.type == NFS4_INVALID_STATEID_TYPE) |
| 911 | return; |
Trond Myklebust | 45870d6 | 2016-09-22 13:38:59 -0400 | [diff] [blame] | 912 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
| 913 | set_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags); |
| 914 | set_bit(NFS4CLNT_DELEGATION_EXPIRED, &server->nfs_client->cl_state); |
| 915 | } |
| 916 | |
Trond Myklebust | bb3d1a3 | 2016-09-22 13:39:00 -0400 | [diff] [blame] | 917 | static void nfs_inode_mark_test_expired_delegation(struct nfs_server *server, |
| 918 | struct inode *inode) |
| 919 | { |
| 920 | struct nfs_delegation *delegation; |
| 921 | |
| 922 | rcu_read_lock(); |
| 923 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
| 924 | if (delegation) |
| 925 | nfs_mark_test_expired_delegation(server, delegation); |
| 926 | rcu_read_unlock(); |
| 927 | |
| 928 | } |
| 929 | |
Trond Myklebust | 45870d6 | 2016-09-22 13:38:59 -0400 | [diff] [blame] | 930 | static void nfs_delegation_mark_test_expired_server(struct nfs_server *server) |
| 931 | { |
| 932 | struct nfs_delegation *delegation; |
| 933 | |
| 934 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) |
| 935 | nfs_mark_test_expired_delegation(server, delegation); |
| 936 | } |
| 937 | |
| 938 | /** |
| 939 | * nfs_mark_test_expired_all_delegations - mark all delegations for testing |
| 940 | * @clp: nfs_client to process |
| 941 | * |
| 942 | * Iterates through all the delegations associated with this server and |
| 943 | * marks them as needing to be checked for validity. |
| 944 | */ |
| 945 | void nfs_mark_test_expired_all_delegations(struct nfs_client *clp) |
| 946 | { |
| 947 | struct nfs_server *server; |
| 948 | |
| 949 | rcu_read_lock(); |
| 950 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| 951 | nfs_delegation_mark_test_expired_server(server); |
| 952 | rcu_read_unlock(); |
| 953 | } |
| 954 | |
| 955 | /** |
| 956 | * nfs_reap_expired_delegations - reap expired delegations |
| 957 | * @clp: nfs_client to process |
| 958 | * |
| 959 | * Iterates through all the delegations associated with this server and |
| 960 | * checks if they have may have been revoked. This function is usually |
| 961 | * expected to be called in cases where the server may have lost its |
| 962 | * lease. |
| 963 | */ |
| 964 | void nfs_reap_expired_delegations(struct nfs_client *clp) |
| 965 | { |
| 966 | const struct nfs4_minor_version_ops *ops = clp->cl_mvops; |
| 967 | struct nfs_delegation *delegation; |
| 968 | struct nfs_server *server; |
| 969 | struct inode *inode; |
| 970 | struct rpc_cred *cred; |
| 971 | nfs4_stateid stateid; |
| 972 | |
| 973 | restart: |
| 974 | rcu_read_lock(); |
| 975 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| 976 | list_for_each_entry_rcu(delegation, &server->delegations, |
| 977 | super_list) { |
| 978 | if (test_bit(NFS_DELEGATION_RETURNING, |
| 979 | &delegation->flags)) |
| 980 | continue; |
| 981 | if (test_bit(NFS_DELEGATION_TEST_EXPIRED, |
| 982 | &delegation->flags) == 0) |
| 983 | continue; |
| 984 | if (!nfs_sb_active(server->super)) |
| 985 | continue; |
| 986 | inode = nfs_delegation_grab_inode(delegation); |
| 987 | if (inode == NULL) { |
| 988 | rcu_read_unlock(); |
| 989 | nfs_sb_deactive(server->super); |
| 990 | goto restart; |
| 991 | } |
| 992 | cred = get_rpccred_rcu(delegation->cred); |
| 993 | nfs4_stateid_copy(&stateid, &delegation->stateid); |
| 994 | clear_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags); |
| 995 | rcu_read_unlock(); |
| 996 | if (cred != NULL && |
| 997 | ops->test_and_free_expired(server, &stateid, cred) < 0) { |
| 998 | nfs_revoke_delegation(inode, &stateid); |
| 999 | nfs_inode_find_state_and_recover(inode, &stateid); |
| 1000 | } |
| 1001 | put_rpccred(cred); |
Trond Myklebust | bb3d1a3 | 2016-09-22 13:39:00 -0400 | [diff] [blame] | 1002 | if (nfs4_server_rebooted(clp)) { |
| 1003 | nfs_inode_mark_test_expired_delegation(server,inode); |
| 1004 | iput(inode); |
| 1005 | nfs_sb_deactive(server->super); |
| 1006 | return; |
| 1007 | } |
Trond Myklebust | 45870d6 | 2016-09-22 13:38:59 -0400 | [diff] [blame] | 1008 | iput(inode); |
| 1009 | nfs_sb_deactive(server->super); |
| 1010 | goto restart; |
| 1011 | } |
| 1012 | } |
| 1013 | rcu_read_unlock(); |
| 1014 | } |
| 1015 | |
Trond Myklebust | 6c2d8f8 | 2016-09-22 13:39:07 -0400 | [diff] [blame] | 1016 | void nfs_inode_find_delegation_state_and_recover(struct inode *inode, |
| 1017 | const nfs4_stateid *stateid) |
| 1018 | { |
| 1019 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
| 1020 | struct nfs_delegation *delegation; |
| 1021 | bool found = false; |
| 1022 | |
| 1023 | rcu_read_lock(); |
| 1024 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
| 1025 | if (delegation && |
| 1026 | nfs4_stateid_match_other(&delegation->stateid, stateid)) { |
| 1027 | nfs_mark_test_expired_delegation(NFS_SERVER(inode), delegation); |
| 1028 | found = true; |
| 1029 | } |
| 1030 | rcu_read_unlock(); |
| 1031 | if (found) |
| 1032 | nfs4_schedule_state_manager(clp); |
| 1033 | } |
| 1034 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 1035 | /** |
| 1036 | * nfs_delegations_present - check for existence of delegations |
| 1037 | * @clp: client state handle |
| 1038 | * |
| 1039 | * Returns one if there are any nfs_delegation structures attached |
| 1040 | * to this nfs_client. |
| 1041 | */ |
| 1042 | int nfs_delegations_present(struct nfs_client *clp) |
| 1043 | { |
| 1044 | struct nfs_server *server; |
| 1045 | int ret = 0; |
| 1046 | |
| 1047 | rcu_read_lock(); |
| 1048 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| 1049 | if (!list_empty(&server->delegations)) { |
| 1050 | ret = 1; |
| 1051 | break; |
| 1052 | } |
| 1053 | rcu_read_unlock(); |
| 1054 | return ret; |
| 1055 | } |
| 1056 | |
| 1057 | /** |
| 1058 | * nfs4_copy_delegation_stateid - Copy inode's state ID information |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 1059 | * @inode: inode to check |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 1060 | * @flags: delegation type requirement |
Trond Myklebust | abf4e13 | 2016-05-16 17:42:44 -0400 | [diff] [blame] | 1061 | * @dst: stateid data structure to fill in |
| 1062 | * @cred: optional argument to retrieve credential |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 1063 | * |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 1064 | * Returns "true" and fills in "dst->data" * if inode had a delegation, |
| 1065 | * otherwise "false" is returned. |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 1066 | */ |
Trond Myklebust | abf4e13 | 2016-05-16 17:42:44 -0400 | [diff] [blame] | 1067 | bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, |
| 1068 | nfs4_stateid *dst, struct rpc_cred **cred) |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 1069 | { |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 1070 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1071 | struct nfs_delegation *delegation; |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 1072 | bool ret; |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 1073 | |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 1074 | flags &= FMODE_READ|FMODE_WRITE; |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 1075 | rcu_read_lock(); |
| 1076 | delegation = rcu_dereference(nfsi->delegation); |
Trond Myklebust | aa05c87 | 2016-09-22 13:38:54 -0400 | [diff] [blame] | 1077 | ret = nfs4_is_valid_delegation(delegation, flags); |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 1078 | if (ret) { |
Trond Myklebust | f597c53 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 1079 | nfs4_stateid_copy(dst, &delegation->stateid); |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 1080 | nfs_mark_delegation_referenced(delegation); |
Trond Myklebust | abf4e13 | 2016-05-16 17:42:44 -0400 | [diff] [blame] | 1081 | if (cred) |
| 1082 | *cred = get_rpccred(delegation->cred); |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 1083 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 1084 | rcu_read_unlock(); |
| 1085 | return ret; |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 1086 | } |
Trond Myklebust | 5445b1f | 2015-09-05 19:06:58 -0400 | [diff] [blame] | 1087 | |
| 1088 | /** |
| 1089 | * nfs4_delegation_flush_on_close - Check if we must flush file on close |
| 1090 | * @inode: inode to check |
| 1091 | * |
| 1092 | * This function checks the number of outstanding writes to the file |
| 1093 | * against the delegation 'space_limit' field to see if |
| 1094 | * the spec requires us to flush the file on close. |
| 1095 | */ |
| 1096 | bool nfs4_delegation_flush_on_close(const struct inode *inode) |
| 1097 | { |
| 1098 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1099 | struct nfs_delegation *delegation; |
| 1100 | bool ret = true; |
| 1101 | |
| 1102 | rcu_read_lock(); |
| 1103 | delegation = rcu_dereference(nfsi->delegation); |
| 1104 | if (delegation == NULL || !(delegation->type & FMODE_WRITE)) |
| 1105 | goto out; |
| 1106 | if (nfsi->nrequests < delegation->pagemod_limit) |
| 1107 | ret = false; |
| 1108 | out: |
| 1109 | rcu_read_unlock(); |
| 1110 | return ret; |
| 1111 | } |