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); |
Trond Myklebust | e4a9330 | 2019-02-21 14:51:25 -0500 | [diff] [blame] | 237 | if (!inode) |
| 238 | set_bit(NFS_DELEGATION_INODE_FREEING, &delegation->flags); |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 239 | spin_unlock(&delegation->lock); |
| 240 | return inode; |
| 241 | } |
| 242 | |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 243 | static struct nfs_delegation * |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 244 | nfs_start_delegation_return_locked(struct nfs_inode *nfsi) |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 245 | { |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 246 | struct nfs_delegation *ret = NULL; |
| 247 | struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 248 | |
| 249 | if (delegation == NULL) |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 250 | goto out; |
| 251 | spin_lock(&delegation->lock); |
| 252 | if (!test_and_set_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) |
| 253 | ret = delegation; |
| 254 | spin_unlock(&delegation->lock); |
| 255 | out: |
| 256 | return ret; |
| 257 | } |
| 258 | |
| 259 | static struct nfs_delegation * |
| 260 | nfs_start_delegation_return(struct nfs_inode *nfsi) |
| 261 | { |
| 262 | struct nfs_delegation *delegation; |
| 263 | |
| 264 | rcu_read_lock(); |
| 265 | delegation = nfs_start_delegation_return_locked(nfsi); |
| 266 | rcu_read_unlock(); |
| 267 | return delegation; |
| 268 | } |
| 269 | |
| 270 | static void |
| 271 | nfs_abort_delegation_return(struct nfs_delegation *delegation, |
| 272 | struct nfs_client *clp) |
| 273 | { |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 274 | |
Trond Myklebust | 3431043 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 275 | spin_lock(&delegation->lock); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 276 | clear_bit(NFS_DELEGATION_RETURNING, &delegation->flags); |
| 277 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
| 278 | spin_unlock(&delegation->lock); |
| 279 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); |
| 280 | } |
| 281 | |
| 282 | static struct nfs_delegation * |
| 283 | nfs_detach_delegation_locked(struct nfs_inode *nfsi, |
| 284 | struct nfs_delegation *delegation, |
| 285 | struct nfs_client *clp) |
| 286 | { |
| 287 | struct nfs_delegation *deleg_cur = |
| 288 | rcu_dereference_protected(nfsi->delegation, |
| 289 | lockdep_is_held(&clp->cl_lock)); |
| 290 | |
| 291 | if (deleg_cur == NULL || delegation != deleg_cur) |
| 292 | return NULL; |
| 293 | |
| 294 | spin_lock(&delegation->lock); |
| 295 | set_bit(NFS_DELEGATION_RETURNING, &delegation->flags); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 296 | list_del_rcu(&delegation->super_list); |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 297 | delegation->inode = NULL; |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 298 | rcu_assign_pointer(nfsi->delegation, NULL); |
Trond Myklebust | 3431043 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 299 | spin_unlock(&delegation->lock); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 300 | return delegation; |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 301 | } |
| 302 | |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 303 | static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi, |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 304 | struct nfs_delegation *delegation, |
| 305 | struct nfs_server *server) |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 306 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 307 | struct nfs_client *clp = server->nfs_client; |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 308 | |
| 309 | spin_lock(&clp->cl_lock); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 310 | delegation = nfs_detach_delegation_locked(nfsi, delegation, clp); |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 311 | spin_unlock(&clp->cl_lock); |
| 312 | return delegation; |
| 313 | } |
| 314 | |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 315 | static struct nfs_delegation * |
| 316 | nfs_inode_detach_delegation(struct inode *inode) |
| 317 | { |
| 318 | struct nfs_inode *nfsi = NFS_I(inode); |
| 319 | struct nfs_server *server = NFS_SERVER(inode); |
| 320 | struct nfs_delegation *delegation; |
| 321 | |
| 322 | delegation = nfs_start_delegation_return(nfsi); |
| 323 | if (delegation == NULL) |
| 324 | return NULL; |
| 325 | return nfs_detach_delegation(nfsi, delegation, server); |
| 326 | } |
| 327 | |
Trond Myklebust | cf6726e | 2014-12-19 11:22:28 -0500 | [diff] [blame] | 328 | static void |
| 329 | nfs_update_inplace_delegation(struct nfs_delegation *delegation, |
| 330 | const struct nfs_delegation *update) |
| 331 | { |
| 332 | if (nfs4_stateid_is_newer(&update->stateid, &delegation->stateid)) { |
| 333 | delegation->stateid.seqid = update->stateid.seqid; |
| 334 | smp_wmb(); |
| 335 | delegation->type = update->type; |
| 336 | } |
| 337 | } |
| 338 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 339 | /** |
| 340 | * nfs_inode_set_delegation - set up a delegation on an inode |
| 341 | * @inode: inode to which delegation applies |
| 342 | * @cred: cred to use for subsequent delegation processing |
| 343 | * @res: new delegation state from server |
| 344 | * |
| 345 | * Returns zero on success, or a negative errno value. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | */ |
| 347 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) |
| 348 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 349 | struct nfs_server *server = NFS_SERVER(inode); |
| 350 | struct nfs_client *clp = server->nfs_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | struct nfs_inode *nfsi = NFS_I(inode); |
David Howells | 17d2c0a | 2010-05-01 12:37:18 -0400 | [diff] [blame] | 352 | struct nfs_delegation *delegation, *old_delegation; |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 353 | struct nfs_delegation *freeme = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | int status = 0; |
| 355 | |
Trond Myklebust | 8535b2b | 2010-05-13 12:51:01 -0400 | [diff] [blame] | 356 | delegation = kmalloc(sizeof(*delegation), GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | if (delegation == NULL) |
| 358 | return -ENOMEM; |
Trond Myklebust | f597c53 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 359 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | delegation->type = res->delegation_type; |
Trond Myklebust | 7d160a6 | 2015-09-05 19:06:57 -0400 | [diff] [blame] | 361 | delegation->pagemod_limit = res->pagemod_limit; |
Trond Myklebust | a9a4a87 | 2011-10-17 16:08:46 -0700 | [diff] [blame] | 362 | delegation->change_attr = inode->i_version; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | delegation->cred = get_rpccred(cred); |
| 364 | delegation->inode = inode; |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 365 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
Trond Myklebust | 3431043 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 366 | spin_lock_init(&delegation->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | |
| 368 | spin_lock(&clp->cl_lock); |
David Howells | 17d2c0a | 2010-05-01 12:37:18 -0400 | [diff] [blame] | 369 | old_delegation = rcu_dereference_protected(nfsi->delegation, |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 370 | lockdep_is_held(&clp->cl_lock)); |
David Howells | 17d2c0a | 2010-05-01 12:37:18 -0400 | [diff] [blame] | 371 | if (old_delegation != NULL) { |
Trond Myklebust | cf6726e | 2014-12-19 11:22:28 -0500 | [diff] [blame] | 372 | /* Is this an update of the existing delegation? */ |
| 373 | if (nfs4_stateid_match_other(&old_delegation->stateid, |
| 374 | &delegation->stateid)) { |
| 375 | nfs_update_inplace_delegation(old_delegation, |
| 376 | delegation); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 377 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | } |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 379 | /* |
| 380 | * Deal with broken servers that hand out two |
| 381 | * delegations for the same file. |
Trond Myklebust | 1728017 | 2012-03-11 13:11:00 -0400 | [diff] [blame] | 382 | * Allow for upgrades to a WRITE delegation, but |
| 383 | * nothing else. |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 384 | */ |
| 385 | dfprintk(FILE, "%s: server %s handed out " |
| 386 | "a duplicate delegation!\n", |
Harvey Harrison | 3110ff8 | 2008-05-02 13:42:44 -0700 | [diff] [blame] | 387 | __func__, clp->cl_hostname); |
Trond Myklebust | 1728017 | 2012-03-11 13:11:00 -0400 | [diff] [blame] | 388 | if (delegation->type == old_delegation->type || |
| 389 | !(delegation->type & FMODE_WRITE)) { |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 390 | freeme = delegation; |
| 391 | delegation = NULL; |
| 392 | goto out; |
| 393 | } |
Trond Myklebust | ade0464 | 2015-02-27 14:25:50 -0500 | [diff] [blame] | 394 | if (test_and_set_bit(NFS_DELEGATION_RETURNING, |
| 395 | &old_delegation->flags)) |
| 396 | goto out; |
| 397 | freeme = nfs_detach_delegation_locked(nfsi, |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 398 | old_delegation, clp); |
| 399 | if (freeme == NULL) |
| 400 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | } |
Trond Myklebust | 38942ba | 2015-03-04 15:59:05 -0500 | [diff] [blame] | 402 | list_add_tail_rcu(&delegation->super_list, &server->delegations); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 403 | rcu_assign_pointer(nfsi->delegation, delegation); |
| 404 | delegation = NULL; |
Trond Myklebust | 412c77c | 2007-07-03 16:10:55 -0400 | [diff] [blame] | 405 | |
| 406 | /* Ensure we revalidate the attributes and page cache! */ |
| 407 | spin_lock(&inode->i_lock); |
| 408 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; |
| 409 | spin_unlock(&inode->i_lock); |
Trond Myklebust | ca8acf8 | 2013-08-13 10:36:56 -0400 | [diff] [blame] | 410 | trace_nfs4_set_delegation(inode, res->delegation_type); |
Trond Myklebust | 412c77c | 2007-07-03 16:10:55 -0400 | [diff] [blame] | 411 | |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 412 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | 603c83d | 2007-10-18 19:59:20 -0400 | [diff] [blame] | 414 | if (delegation != NULL) |
| 415 | nfs_free_delegation(delegation); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 416 | if (freeme != NULL) |
| 417 | nfs_do_return_delegation(inode, freeme, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | return status; |
| 419 | } |
| 420 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | /* |
| 422 | * Basic procedure for returning a delegation to the server |
| 423 | */ |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 424 | 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] | 425 | { |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 426 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | struct nfs_inode *nfsi = NFS_I(inode); |
Trond Myklebust | 869f9df | 2014-11-10 18:43:56 -0500 | [diff] [blame] | 428 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 430 | if (delegation == NULL) |
| 431 | return 0; |
| 432 | do { |
Trond Myklebust | 869f9df | 2014-11-10 18:43:56 -0500 | [diff] [blame] | 433 | if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) |
| 434 | break; |
Trond Myklebust | 24311f8 | 2015-09-20 10:50:17 -0400 | [diff] [blame] | 435 | err = nfs_delegation_claim_opens(inode, &delegation->stateid, |
| 436 | delegation->type); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 437 | if (!issync || err != -EAGAIN) |
| 438 | break; |
| 439 | /* |
| 440 | * Guard against state recovery |
| 441 | */ |
| 442 | err = nfs4_wait_clnt_recover(clp); |
| 443 | } while (err == 0); |
| 444 | |
| 445 | if (err) { |
| 446 | nfs_abort_delegation_return(delegation, clp); |
| 447 | goto out; |
| 448 | } |
| 449 | if (!nfs_detach_delegation(nfsi, delegation, NFS_SERVER(inode))) |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 450 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 452 | err = nfs_do_return_delegation(inode, delegation, issync); |
| 453 | out: |
| 454 | return err; |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 455 | } |
| 456 | |
Trond Myklebust | b757144 | 2013-04-03 14:33:49 -0400 | [diff] [blame] | 457 | static bool nfs_delegation_need_return(struct nfs_delegation *delegation) |
| 458 | { |
| 459 | bool ret = false; |
| 460 | |
Trond Myklebust | ec3ca4e | 2015-02-26 14:05:05 -0500 | [diff] [blame] | 461 | if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) |
| 462 | goto out; |
Trond Myklebust | b757144 | 2013-04-03 14:33:49 -0400 | [diff] [blame] | 463 | if (test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags)) |
| 464 | ret = true; |
| 465 | if (test_and_clear_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags) && !ret) { |
| 466 | struct inode *inode; |
| 467 | |
| 468 | spin_lock(&delegation->lock); |
| 469 | inode = delegation->inode; |
| 470 | if (inode && list_empty(&NFS_I(inode)->open_files)) |
| 471 | ret = true; |
| 472 | spin_unlock(&delegation->lock); |
| 473 | } |
Trond Myklebust | ec3ca4e | 2015-02-26 14:05:05 -0500 | [diff] [blame] | 474 | out: |
Trond Myklebust | b757144 | 2013-04-03 14:33:49 -0400 | [diff] [blame] | 475 | return ret; |
| 476 | } |
| 477 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 478 | /** |
| 479 | * nfs_client_return_marked_delegations - return previously marked delegations |
| 480 | * @clp: nfs_client to process |
| 481 | * |
Trond Myklebust | dc327ed | 2012-05-06 19:46:30 -0400 | [diff] [blame] | 482 | * Note that this function is designed to be called by the state |
| 483 | * manager thread. For this reason, it cannot flush the dirty data, |
| 484 | * since that could deadlock in case of a state recovery error. |
| 485 | * |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 486 | * Returns zero on success, or a negative errno value. |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 487 | */ |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 488 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 489 | { |
| 490 | struct nfs_delegation *delegation; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 491 | struct nfs_server *server; |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 492 | struct inode *inode; |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 493 | int err = 0; |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 494 | |
| 495 | restart: |
| 496 | rcu_read_lock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 497 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| 498 | list_for_each_entry_rcu(delegation, &server->delegations, |
| 499 | super_list) { |
Trond Myklebust | b757144 | 2013-04-03 14:33:49 -0400 | [diff] [blame] | 500 | if (!nfs_delegation_need_return(delegation)) |
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 | if (!nfs_sb_active(server->super)) |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 503 | continue; |
Trond Myklebust | 9f0f8e1 | 2015-02-26 09:57:34 -0500 | [diff] [blame] | 504 | inode = nfs_delegation_grab_inode(delegation); |
| 505 | if (inode == NULL) { |
| 506 | rcu_read_unlock(); |
| 507 | nfs_sb_deactive(server->super); |
| 508 | goto restart; |
| 509 | } |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 510 | delegation = nfs_start_delegation_return_locked(NFS_I(inode)); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 511 | rcu_read_unlock(); |
| 512 | |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 513 | err = nfs_end_delegation_return(inode, delegation, 0); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 514 | iput(inode); |
Trond Myklebust | 9f0f8e1 | 2015-02-26 09:57:34 -0500 | [diff] [blame] | 515 | nfs_sb_deactive(server->super); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 516 | if (!err) |
| 517 | goto restart; |
| 518 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); |
| 519 | return err; |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 520 | } |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 521 | } |
| 522 | rcu_read_unlock(); |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 523 | return 0; |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 524 | } |
| 525 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 526 | /** |
| 527 | * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens |
| 528 | * @inode: inode to process |
| 529 | * |
| 530 | * Does not protect against delegation reclaims, therefore really only safe |
| 531 | * to be called from nfs4_clear_inode(). |
Trond Myklebust | e6f8107 | 2008-01-24 18:14:34 -0500 | [diff] [blame] | 532 | */ |
| 533 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) |
| 534 | { |
Trond Myklebust | e6f8107 | 2008-01-24 18:14:34 -0500 | [diff] [blame] | 535 | struct nfs_delegation *delegation; |
| 536 | |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 537 | delegation = nfs_inode_detach_delegation(inode); |
| 538 | if (delegation != NULL) |
Trond Myklebust | 5fcdfac | 2015-03-25 13:19:42 -0400 | [diff] [blame] | 539 | nfs_do_return_delegation(inode, delegation, 1); |
Trond Myklebust | e6f8107 | 2008-01-24 18:14:34 -0500 | [diff] [blame] | 540 | } |
| 541 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 542 | /** |
| 543 | * nfs_inode_return_delegation - synchronously return a delegation |
| 544 | * @inode: inode to process |
| 545 | * |
Trond Myklebust | c57d1bc | 2012-05-06 19:34:17 -0400 | [diff] [blame] | 546 | * This routine will always flush any dirty data to disk on the |
| 547 | * assumption that if we need to return the delegation, then |
| 548 | * we should stop caching. |
| 549 | * |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 550 | * Returns zero on success, or a negative errno value. |
| 551 | */ |
Bryan Schumaker | 57ec14c | 2012-06-20 15:53:44 -0400 | [diff] [blame] | 552 | int nfs4_inode_return_delegation(struct inode *inode) |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 553 | { |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 554 | struct nfs_inode *nfsi = NFS_I(inode); |
| 555 | struct nfs_delegation *delegation; |
| 556 | int err = 0; |
| 557 | |
Trond Myklebust | c57d1bc | 2012-05-06 19:34:17 -0400 | [diff] [blame] | 558 | nfs_wb_all(inode); |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 559 | delegation = nfs_start_delegation_return(nfsi); |
| 560 | if (delegation != NULL) |
| 561 | err = nfs_end_delegation_return(inode, delegation, 1); |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 562 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | } |
| 564 | |
Trond Myklebust | b757144 | 2013-04-03 14:33:49 -0400 | [diff] [blame] | 565 | static void nfs_mark_return_if_closed_delegation(struct nfs_server *server, |
| 566 | struct nfs_delegation *delegation) |
| 567 | { |
| 568 | set_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags); |
| 569 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); |
| 570 | } |
| 571 | |
Trond Myklebust | ed1e621 | 2011-07-25 15:37:29 -0400 | [diff] [blame] | 572 | static void nfs_mark_return_delegation(struct nfs_server *server, |
| 573 | struct nfs_delegation *delegation) |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 574 | { |
| 575 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
Trond Myklebust | ed1e621 | 2011-07-25 15:37:29 -0400 | [diff] [blame] | 576 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 577 | } |
| 578 | |
Trond Myklebust | 5c31e23 | 2013-04-03 19:04:58 -0400 | [diff] [blame] | 579 | static bool nfs_server_mark_return_all_delegations(struct nfs_server *server) |
| 580 | { |
| 581 | struct nfs_delegation *delegation; |
| 582 | bool ret = false; |
| 583 | |
| 584 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
| 585 | nfs_mark_return_delegation(server, delegation); |
| 586 | ret = true; |
| 587 | } |
| 588 | return ret; |
| 589 | } |
| 590 | |
Trond Myklebust | b02ba0b | 2013-04-03 19:23:58 -0400 | [diff] [blame] | 591 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
| 592 | { |
| 593 | struct nfs_server *server; |
| 594 | |
| 595 | rcu_read_lock(); |
| 596 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| 597 | nfs_server_mark_return_all_delegations(server); |
| 598 | rcu_read_unlock(); |
| 599 | } |
| 600 | |
| 601 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) |
| 602 | { |
| 603 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) |
| 604 | nfs4_schedule_state_manager(clp); |
| 605 | } |
| 606 | |
| 607 | /** |
| 608 | * nfs_expire_all_delegations |
| 609 | * @clp: client to process |
| 610 | * |
| 611 | */ |
| 612 | void nfs_expire_all_delegations(struct nfs_client *clp) |
| 613 | { |
| 614 | nfs_client_mark_return_all_delegations(clp); |
| 615 | nfs_delegation_run_state_manager(clp); |
| 616 | } |
| 617 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 618 | /** |
| 619 | * nfs_super_return_all_delegations - return delegations for one superblock |
| 620 | * @sb: sb to process |
| 621 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | */ |
Bryan Schumaker | eeebf91 | 2012-06-20 15:53:41 -0400 | [diff] [blame] | 623 | void nfs_server_return_all_delegations(struct nfs_server *server) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 625 | struct nfs_client *clp = server->nfs_client; |
Trond Myklebust | 5c31e23 | 2013-04-03 19:04:58 -0400 | [diff] [blame] | 626 | bool need_wait; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | |
| 628 | if (clp == NULL) |
| 629 | return; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 630 | |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 631 | rcu_read_lock(); |
Trond Myklebust | 5c31e23 | 2013-04-03 19:04:58 -0400 | [diff] [blame] | 632 | need_wait = nfs_server_mark_return_all_delegations(server); |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 633 | rcu_read_unlock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 634 | |
Trond Myklebust | 5c31e23 | 2013-04-03 19:04:58 -0400 | [diff] [blame] | 635 | if (need_wait) { |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 636 | nfs4_schedule_state_manager(clp); |
Trond Myklebust | 5c31e23 | 2013-04-03 19:04:58 -0400 | [diff] [blame] | 637 | nfs4_wait_clnt_recover(clp); |
| 638 | } |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 639 | } |
| 640 | |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 641 | static void nfs_mark_return_unused_delegation_types(struct nfs_server *server, |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 642 | fmode_t flags) |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 643 | { |
| 644 | struct nfs_delegation *delegation; |
| 645 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 646 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
Alexandros Batsakis | c79571a | 2009-12-05 13:20:52 -0500 | [diff] [blame] | 647 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
| 648 | continue; |
| 649 | if (delegation->type & flags) |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 650 | nfs_mark_return_if_closed_delegation(server, delegation); |
Trond Myklebust | 707fb4b | 2008-12-23 15:21:47 -0500 | [diff] [blame] | 651 | } |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 652 | } |
| 653 | |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 654 | 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] | 655 | fmode_t flags) |
| 656 | { |
| 657 | struct nfs_server *server; |
| 658 | |
| 659 | rcu_read_lock(); |
| 660 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 661 | nfs_mark_return_unused_delegation_types(server, flags); |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 662 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | } |
| 664 | |
Trond Myklebust | 41020b6 | 2016-09-22 13:38:58 -0400 | [diff] [blame] | 665 | static void nfs_mark_delegation_revoked(struct nfs_server *server, |
| 666 | struct nfs_delegation *delegation) |
Trond Myklebust | 869f9df | 2014-11-10 18:43:56 -0500 | [diff] [blame] | 667 | { |
Trond Myklebust | 41020b6 | 2016-09-22 13:38:58 -0400 | [diff] [blame] | 668 | set_bit(NFS_DELEGATION_REVOKED, &delegation->flags); |
Trond Myklebust | 059b43e | 2016-09-22 13:39:06 -0400 | [diff] [blame] | 669 | delegation->stateid.type = NFS4_INVALID_STATEID_TYPE; |
Trond Myklebust | 41020b6 | 2016-09-22 13:38:58 -0400 | [diff] [blame] | 670 | nfs_mark_return_delegation(server, delegation); |
Trond Myklebust | 869f9df | 2014-11-10 18:43:56 -0500 | [diff] [blame] | 671 | } |
| 672 | |
Trond Myklebust | 41020b6 | 2016-09-22 13:38:58 -0400 | [diff] [blame] | 673 | static bool nfs_revoke_delegation(struct inode *inode, |
| 674 | const nfs4_stateid *stateid) |
| 675 | { |
| 676 | struct nfs_delegation *delegation; |
Trond Myklebust | 7f04883 | 2016-09-22 13:39:14 -0400 | [diff] [blame] | 677 | nfs4_stateid tmp; |
Trond Myklebust | 41020b6 | 2016-09-22 13:38:58 -0400 | [diff] [blame] | 678 | bool ret = false; |
| 679 | |
| 680 | rcu_read_lock(); |
| 681 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
| 682 | if (delegation == NULL) |
| 683 | goto out; |
Trond Myklebust | 7f04883 | 2016-09-22 13:39:14 -0400 | [diff] [blame] | 684 | if (stateid == NULL) { |
| 685 | nfs4_stateid_copy(&tmp, &delegation->stateid); |
| 686 | stateid = &tmp; |
| 687 | } else if (!nfs4_stateid_match(stateid, &delegation->stateid)) |
Trond Myklebust | 41020b6 | 2016-09-22 13:38:58 -0400 | [diff] [blame] | 688 | goto out; |
| 689 | nfs_mark_delegation_revoked(NFS_SERVER(inode), delegation); |
| 690 | ret = true; |
| 691 | out: |
| 692 | rcu_read_unlock(); |
Trond Myklebust | 7f04883 | 2016-09-22 13:39:14 -0400 | [diff] [blame] | 693 | if (ret) |
| 694 | nfs_inode_find_state_and_recover(inode, stateid); |
Trond Myklebust | 41020b6 | 2016-09-22 13:38:58 -0400 | [diff] [blame] | 695 | return ret; |
| 696 | } |
| 697 | |
| 698 | void nfs_remove_bad_delegation(struct inode *inode, |
| 699 | const nfs4_stateid *stateid) |
Trond Myklebust | a1d0b5e | 2012-03-05 19:56:44 -0500 | [diff] [blame] | 700 | { |
| 701 | struct nfs_delegation *delegation; |
| 702 | |
Trond Myklebust | 41020b6 | 2016-09-22 13:38:58 -0400 | [diff] [blame] | 703 | if (!nfs_revoke_delegation(inode, stateid)) |
| 704 | return; |
Trond Myklebust | d25be54 | 2013-02-05 11:43:28 -0500 | [diff] [blame] | 705 | delegation = nfs_inode_detach_delegation(inode); |
Trond Myklebust | 7f04883 | 2016-09-22 13:39:14 -0400 | [diff] [blame] | 706 | if (delegation) |
Trond Myklebust | a1d0b5e | 2012-03-05 19:56:44 -0500 | [diff] [blame] | 707 | nfs_free_delegation(delegation); |
Trond Myklebust | a1d0b5e | 2012-03-05 19:56:44 -0500 | [diff] [blame] | 708 | } |
Andy Adamson | 9cb8196 | 2012-03-07 10:49:41 -0500 | [diff] [blame] | 709 | EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation); |
Trond Myklebust | a1d0b5e | 2012-03-05 19:56:44 -0500 | [diff] [blame] | 710 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 711 | /** |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 712 | * nfs_expire_unused_delegation_types |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 713 | * @clp: client to process |
| 714 | * @flags: delegation types to expire |
| 715 | * |
| 716 | */ |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 717 | 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] | 718 | { |
Trond Myklebust | 826e001 | 2013-04-03 19:27:52 -0400 | [diff] [blame] | 719 | nfs_client_mark_return_unused_delegation_types(clp, flags); |
Alexandros Batsakis | c79571a | 2009-12-05 13:20:52 -0500 | [diff] [blame] | 720 | nfs_delegation_run_state_manager(clp); |
| 721 | } |
| 722 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 723 | static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server) |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 724 | { |
| 725 | struct nfs_delegation *delegation; |
| 726 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 727 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 728 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) |
| 729 | continue; |
Trond Myklebust | b757144 | 2013-04-03 14:33:49 -0400 | [diff] [blame] | 730 | nfs_mark_return_if_closed_delegation(server, delegation); |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 731 | } |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 732 | } |
| 733 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 734 | /** |
| 735 | * nfs_expire_unreferenced_delegations - Eliminate unused delegations |
| 736 | * @clp: nfs_client to process |
| 737 | * |
| 738 | */ |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 739 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) |
| 740 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 741 | struct nfs_server *server; |
| 742 | |
| 743 | rcu_read_lock(); |
| 744 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| 745 | nfs_mark_return_unreferenced_delegations(server); |
| 746 | rcu_read_unlock(); |
| 747 | |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 748 | nfs_delegation_run_state_manager(clp); |
| 749 | } |
| 750 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 751 | /** |
| 752 | * nfs_async_inode_return_delegation - asynchronously return a delegation |
| 753 | * @inode: inode to process |
Trond Myklebust | 8e663f0 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 754 | * @stateid: state ID information |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 755 | * |
| 756 | * Returns zero on success, or a negative errno value. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | */ |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 758 | int nfs_async_inode_return_delegation(struct inode *inode, |
| 759 | const nfs4_stateid *stateid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | { |
Trond Myklebust | ed1e621 | 2011-07-25 15:37:29 -0400 | [diff] [blame] | 761 | struct nfs_server *server = NFS_SERVER(inode); |
| 762 | struct nfs_client *clp = server->nfs_client; |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 763 | struct nfs_delegation *delegation; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 765 | rcu_read_lock(); |
| 766 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
Trond Myklebust | 755a48a | 2014-03-02 22:03:12 -0500 | [diff] [blame] | 767 | if (delegation == NULL) |
| 768 | goto out_enoent; |
Trond Myklebust | 4816fda | 2015-09-20 14:58:42 -0400 | [diff] [blame] | 769 | if (stateid != NULL && |
| 770 | !clp->cl_mvops->match_stateid(&delegation->stateid, stateid)) |
Trond Myklebust | 755a48a | 2014-03-02 22:03:12 -0500 | [diff] [blame] | 771 | goto out_enoent; |
Trond Myklebust | ed1e621 | 2011-07-25 15:37:29 -0400 | [diff] [blame] | 772 | nfs_mark_return_delegation(server, delegation); |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 773 | rcu_read_unlock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 774 | |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 775 | nfs_delegation_run_state_manager(clp); |
| 776 | return 0; |
Trond Myklebust | 755a48a | 2014-03-02 22:03:12 -0500 | [diff] [blame] | 777 | out_enoent: |
| 778 | rcu_read_unlock(); |
| 779 | return -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | } |
| 781 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 782 | static struct inode * |
| 783 | nfs_delegation_find_inode_server(struct nfs_server *server, |
| 784 | const struct nfs_fh *fhandle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | { |
| 786 | struct nfs_delegation *delegation; |
| 787 | struct inode *res = NULL; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 788 | |
| 789 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 790 | spin_lock(&delegation->lock); |
| 791 | if (delegation->inode != NULL && |
| 792 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | res = igrab(delegation->inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | } |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 795 | spin_unlock(&delegation->lock); |
| 796 | if (res != NULL) |
| 797 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | } |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 799 | return res; |
| 800 | } |
| 801 | |
| 802 | /** |
| 803 | * nfs_delegation_find_inode - retrieve the inode associated with a delegation |
| 804 | * @clp: client state handle |
| 805 | * @fhandle: filehandle from a delegation recall |
| 806 | * |
| 807 | * Returns pointer to inode matching "fhandle," or NULL if a matching inode |
| 808 | * cannot be found. |
| 809 | */ |
| 810 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, |
| 811 | const struct nfs_fh *fhandle) |
| 812 | { |
| 813 | struct nfs_server *server; |
| 814 | struct inode *res = NULL; |
| 815 | |
| 816 | rcu_read_lock(); |
| 817 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| 818 | res = nfs_delegation_find_inode_server(server, fhandle); |
| 819 | if (res != NULL) |
| 820 | break; |
| 821 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 822 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | return res; |
| 824 | } |
| 825 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 826 | static void nfs_delegation_mark_reclaim_server(struct nfs_server *server) |
| 827 | { |
| 828 | struct nfs_delegation *delegation; |
| 829 | |
Trond Myklebust | 45870d6 | 2016-09-22 13:38:59 -0400 | [diff] [blame] | 830 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
| 831 | /* |
| 832 | * If the delegation may have been admin revoked, then we |
| 833 | * cannot reclaim it. |
| 834 | */ |
| 835 | if (test_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags)) |
| 836 | continue; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 837 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
Trond Myklebust | 45870d6 | 2016-09-22 13:38:59 -0400 | [diff] [blame] | 838 | } |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 839 | } |
| 840 | |
| 841 | /** |
| 842 | * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed |
| 843 | * @clp: nfs_client to process |
| 844 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | */ |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 846 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 848 | struct nfs_server *server; |
| 849 | |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 850 | rcu_read_lock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 851 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| 852 | nfs_delegation_mark_reclaim_server(server); |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 853 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | } |
| 855 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 856 | /** |
| 857 | * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done |
| 858 | * @clp: nfs_client to process |
| 859 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | */ |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 861 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | { |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 863 | struct nfs_delegation *delegation; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 864 | struct nfs_server *server; |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 865 | struct inode *inode; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 866 | |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 867 | restart: |
| 868 | rcu_read_lock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 869 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| 870 | list_for_each_entry_rcu(delegation, &server->delegations, |
| 871 | super_list) { |
Trond Myklebust | e4a9330 | 2019-02-21 14:51:25 -0500 | [diff] [blame] | 872 | if (test_bit(NFS_DELEGATION_INODE_FREEING, |
| 873 | &delegation->flags) || |
| 874 | test_bit(NFS_DELEGATION_RETURNING, |
| 875 | &delegation->flags) || |
| 876 | test_bit(NFS_DELEGATION_NEED_RECLAIM, |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 877 | &delegation->flags) == 0) |
| 878 | continue; |
Trond Myklebust | 9f0f8e1 | 2015-02-26 09:57:34 -0500 | [diff] [blame] | 879 | if (!nfs_sb_active(server->super)) |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 880 | continue; |
Trond Myklebust | 9f0f8e1 | 2015-02-26 09:57:34 -0500 | [diff] [blame] | 881 | inode = nfs_delegation_grab_inode(delegation); |
| 882 | if (inode == NULL) { |
| 883 | rcu_read_unlock(); |
| 884 | nfs_sb_deactive(server->super); |
| 885 | goto restart; |
| 886 | } |
Trond Myklebust | b04b22f | 2015-02-26 13:59:38 -0500 | [diff] [blame] | 887 | delegation = nfs_start_delegation_return_locked(NFS_I(inode)); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 888 | rcu_read_unlock(); |
Trond Myklebust | b04b22f | 2015-02-26 13:59:38 -0500 | [diff] [blame] | 889 | if (delegation != NULL) { |
| 890 | delegation = nfs_detach_delegation(NFS_I(inode), |
| 891 | delegation, server); |
| 892 | if (delegation != NULL) |
| 893 | nfs_free_delegation(delegation); |
| 894 | } |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 895 | iput(inode); |
Trond Myklebust | 9f0f8e1 | 2015-02-26 09:57:34 -0500 | [diff] [blame] | 896 | nfs_sb_deactive(server->super); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 897 | goto restart; |
| 898 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 900 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | } |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 902 | |
Trond Myklebust | bb3d1a3 | 2016-09-22 13:39:00 -0400 | [diff] [blame] | 903 | static inline bool nfs4_server_rebooted(const struct nfs_client *clp) |
| 904 | { |
| 905 | return (clp->cl_state & (BIT(NFS4CLNT_CHECK_LEASE) | |
| 906 | BIT(NFS4CLNT_LEASE_EXPIRED) | |
| 907 | BIT(NFS4CLNT_SESSION_RESET))) != 0; |
| 908 | } |
| 909 | |
Trond Myklebust | 45870d6 | 2016-09-22 13:38:59 -0400 | [diff] [blame] | 910 | static void nfs_mark_test_expired_delegation(struct nfs_server *server, |
| 911 | struct nfs_delegation *delegation) |
| 912 | { |
Trond Myklebust | 059b43e | 2016-09-22 13:39:06 -0400 | [diff] [blame] | 913 | if (delegation->stateid.type == NFS4_INVALID_STATEID_TYPE) |
| 914 | return; |
Trond Myklebust | 45870d6 | 2016-09-22 13:38:59 -0400 | [diff] [blame] | 915 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
| 916 | set_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags); |
| 917 | set_bit(NFS4CLNT_DELEGATION_EXPIRED, &server->nfs_client->cl_state); |
| 918 | } |
| 919 | |
Trond Myklebust | bb3d1a3 | 2016-09-22 13:39:00 -0400 | [diff] [blame] | 920 | static void nfs_inode_mark_test_expired_delegation(struct nfs_server *server, |
| 921 | struct inode *inode) |
| 922 | { |
| 923 | struct nfs_delegation *delegation; |
| 924 | |
| 925 | rcu_read_lock(); |
| 926 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
| 927 | if (delegation) |
| 928 | nfs_mark_test_expired_delegation(server, delegation); |
| 929 | rcu_read_unlock(); |
| 930 | |
| 931 | } |
| 932 | |
Trond Myklebust | 45870d6 | 2016-09-22 13:38:59 -0400 | [diff] [blame] | 933 | static void nfs_delegation_mark_test_expired_server(struct nfs_server *server) |
| 934 | { |
| 935 | struct nfs_delegation *delegation; |
| 936 | |
| 937 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) |
| 938 | nfs_mark_test_expired_delegation(server, delegation); |
| 939 | } |
| 940 | |
| 941 | /** |
| 942 | * nfs_mark_test_expired_all_delegations - mark all delegations for testing |
| 943 | * @clp: nfs_client to process |
| 944 | * |
| 945 | * Iterates through all the delegations associated with this server and |
| 946 | * marks them as needing to be checked for validity. |
| 947 | */ |
| 948 | void nfs_mark_test_expired_all_delegations(struct nfs_client *clp) |
| 949 | { |
| 950 | struct nfs_server *server; |
| 951 | |
| 952 | rcu_read_lock(); |
| 953 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| 954 | nfs_delegation_mark_test_expired_server(server); |
| 955 | rcu_read_unlock(); |
| 956 | } |
| 957 | |
| 958 | /** |
| 959 | * nfs_reap_expired_delegations - reap expired delegations |
| 960 | * @clp: nfs_client to process |
| 961 | * |
| 962 | * Iterates through all the delegations associated with this server and |
| 963 | * checks if they have may have been revoked. This function is usually |
| 964 | * expected to be called in cases where the server may have lost its |
| 965 | * lease. |
| 966 | */ |
| 967 | void nfs_reap_expired_delegations(struct nfs_client *clp) |
| 968 | { |
| 969 | const struct nfs4_minor_version_ops *ops = clp->cl_mvops; |
| 970 | struct nfs_delegation *delegation; |
| 971 | struct nfs_server *server; |
| 972 | struct inode *inode; |
| 973 | struct rpc_cred *cred; |
| 974 | nfs4_stateid stateid; |
| 975 | |
| 976 | restart: |
| 977 | rcu_read_lock(); |
| 978 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| 979 | list_for_each_entry_rcu(delegation, &server->delegations, |
| 980 | super_list) { |
Trond Myklebust | e4a9330 | 2019-02-21 14:51:25 -0500 | [diff] [blame] | 981 | if (test_bit(NFS_DELEGATION_INODE_FREEING, |
| 982 | &delegation->flags) || |
| 983 | test_bit(NFS_DELEGATION_RETURNING, |
| 984 | &delegation->flags) || |
| 985 | test_bit(NFS_DELEGATION_TEST_EXPIRED, |
Trond Myklebust | 45870d6 | 2016-09-22 13:38:59 -0400 | [diff] [blame] | 986 | &delegation->flags) == 0) |
| 987 | continue; |
| 988 | if (!nfs_sb_active(server->super)) |
| 989 | continue; |
| 990 | inode = nfs_delegation_grab_inode(delegation); |
| 991 | if (inode == NULL) { |
| 992 | rcu_read_unlock(); |
| 993 | nfs_sb_deactive(server->super); |
| 994 | goto restart; |
| 995 | } |
| 996 | cred = get_rpccred_rcu(delegation->cred); |
| 997 | nfs4_stateid_copy(&stateid, &delegation->stateid); |
| 998 | clear_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags); |
| 999 | rcu_read_unlock(); |
| 1000 | if (cred != NULL && |
| 1001 | ops->test_and_free_expired(server, &stateid, cred) < 0) { |
| 1002 | nfs_revoke_delegation(inode, &stateid); |
| 1003 | nfs_inode_find_state_and_recover(inode, &stateid); |
| 1004 | } |
| 1005 | put_rpccred(cred); |
Trond Myklebust | bb3d1a3 | 2016-09-22 13:39:00 -0400 | [diff] [blame] | 1006 | if (nfs4_server_rebooted(clp)) { |
| 1007 | nfs_inode_mark_test_expired_delegation(server,inode); |
| 1008 | iput(inode); |
| 1009 | nfs_sb_deactive(server->super); |
| 1010 | return; |
| 1011 | } |
Trond Myklebust | 45870d6 | 2016-09-22 13:38:59 -0400 | [diff] [blame] | 1012 | iput(inode); |
| 1013 | nfs_sb_deactive(server->super); |
| 1014 | goto restart; |
| 1015 | } |
| 1016 | } |
| 1017 | rcu_read_unlock(); |
| 1018 | } |
| 1019 | |
Trond Myklebust | 6c2d8f8 | 2016-09-22 13:39:07 -0400 | [diff] [blame] | 1020 | void nfs_inode_find_delegation_state_and_recover(struct inode *inode, |
| 1021 | const nfs4_stateid *stateid) |
| 1022 | { |
| 1023 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
| 1024 | struct nfs_delegation *delegation; |
| 1025 | bool found = false; |
| 1026 | |
| 1027 | rcu_read_lock(); |
| 1028 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
| 1029 | if (delegation && |
| 1030 | nfs4_stateid_match_other(&delegation->stateid, stateid)) { |
| 1031 | nfs_mark_test_expired_delegation(NFS_SERVER(inode), delegation); |
| 1032 | found = true; |
| 1033 | } |
| 1034 | rcu_read_unlock(); |
| 1035 | if (found) |
| 1036 | nfs4_schedule_state_manager(clp); |
| 1037 | } |
| 1038 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 1039 | /** |
| 1040 | * nfs_delegations_present - check for existence of delegations |
| 1041 | * @clp: client state handle |
| 1042 | * |
| 1043 | * Returns one if there are any nfs_delegation structures attached |
| 1044 | * to this nfs_client. |
| 1045 | */ |
| 1046 | int nfs_delegations_present(struct nfs_client *clp) |
| 1047 | { |
| 1048 | struct nfs_server *server; |
| 1049 | int ret = 0; |
| 1050 | |
| 1051 | rcu_read_lock(); |
| 1052 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| 1053 | if (!list_empty(&server->delegations)) { |
| 1054 | ret = 1; |
| 1055 | break; |
| 1056 | } |
| 1057 | rcu_read_unlock(); |
| 1058 | return ret; |
| 1059 | } |
| 1060 | |
| 1061 | /** |
| 1062 | * nfs4_copy_delegation_stateid - Copy inode's state ID information |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 1063 | * @inode: inode to check |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 1064 | * @flags: delegation type requirement |
Trond Myklebust | abf4e13 | 2016-05-16 17:42:44 -0400 | [diff] [blame] | 1065 | * @dst: stateid data structure to fill in |
| 1066 | * @cred: optional argument to retrieve credential |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 1067 | * |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 1068 | * Returns "true" and fills in "dst->data" * if inode had a delegation, |
| 1069 | * otherwise "false" is returned. |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 1070 | */ |
Trond Myklebust | abf4e13 | 2016-05-16 17:42:44 -0400 | [diff] [blame] | 1071 | bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, |
| 1072 | nfs4_stateid *dst, struct rpc_cred **cred) |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 1073 | { |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 1074 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1075 | struct nfs_delegation *delegation; |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 1076 | bool ret; |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 1077 | |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 1078 | flags &= FMODE_READ|FMODE_WRITE; |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 1079 | rcu_read_lock(); |
| 1080 | delegation = rcu_dereference(nfsi->delegation); |
Trond Myklebust | aa05c87 | 2016-09-22 13:38:54 -0400 | [diff] [blame] | 1081 | ret = nfs4_is_valid_delegation(delegation, flags); |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 1082 | if (ret) { |
Trond Myklebust | f597c53 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 1083 | nfs4_stateid_copy(dst, &delegation->stateid); |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 1084 | nfs_mark_delegation_referenced(delegation); |
Trond Myklebust | abf4e13 | 2016-05-16 17:42:44 -0400 | [diff] [blame] | 1085 | if (cred) |
| 1086 | *cred = get_rpccred(delegation->cred); |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 1087 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 1088 | rcu_read_unlock(); |
| 1089 | return ret; |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 1090 | } |
Trond Myklebust | 5445b1f | 2015-09-05 19:06:58 -0400 | [diff] [blame] | 1091 | |
| 1092 | /** |
| 1093 | * nfs4_delegation_flush_on_close - Check if we must flush file on close |
| 1094 | * @inode: inode to check |
| 1095 | * |
| 1096 | * This function checks the number of outstanding writes to the file |
| 1097 | * against the delegation 'space_limit' field to see if |
| 1098 | * the spec requires us to flush the file on close. |
| 1099 | */ |
| 1100 | bool nfs4_delegation_flush_on_close(const struct inode *inode) |
| 1101 | { |
| 1102 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1103 | struct nfs_delegation *delegation; |
| 1104 | bool ret = true; |
| 1105 | |
| 1106 | rcu_read_lock(); |
| 1107 | delegation = rcu_dereference(nfsi->delegation); |
| 1108 | if (delegation == NULL || !(delegation->type & FMODE_WRITE)) |
| 1109 | goto out; |
| 1110 | if (nfsi->nrequests < delegation->pagemod_limit) |
| 1111 | ret = false; |
| 1112 | out: |
| 1113 | rcu_read_unlock(); |
| 1114 | return ret; |
| 1115 | } |