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" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
Trond Myklebust | 905f8d1 | 2007-08-06 12:18:34 -0400 | [diff] [blame] | 24 | static void nfs_free_delegation(struct nfs_delegation *delegation) |
| 25 | { |
Trond Myklebust | e00b8a2 | 2011-01-27 14:55:39 -0500 | [diff] [blame] | 26 | if (delegation->cred) { |
| 27 | put_rpccred(delegation->cred); |
| 28 | delegation->cred = NULL; |
| 29 | } |
Lai Jiangshan | 26f04dd | 2011-05-01 06:21:54 -0700 | [diff] [blame] | 30 | kfree_rcu(delegation, rcu); |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 31 | } |
| 32 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 33 | /** |
| 34 | * nfs_mark_delegation_referenced - set delegation's REFERENCED flag |
| 35 | * @delegation: delegation to process |
| 36 | * |
| 37 | */ |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 38 | void nfs_mark_delegation_referenced(struct nfs_delegation *delegation) |
| 39 | { |
| 40 | set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags); |
| 41 | } |
| 42 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 43 | /** |
| 44 | * nfs_have_delegation - check if inode has a delegation |
| 45 | * @inode: inode to check |
| 46 | * @flags: delegation types to check for |
| 47 | * |
| 48 | * Returns one if inode has the indicated delegation, otherwise zero. |
| 49 | */ |
Trond Myklebust | bd7bf9d | 2008-12-23 15:21:53 -0500 | [diff] [blame] | 50 | int nfs_have_delegation(struct inode *inode, fmode_t flags) |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 51 | { |
| 52 | struct nfs_delegation *delegation; |
| 53 | int ret = 0; |
| 54 | |
| 55 | flags &= FMODE_READ|FMODE_WRITE; |
| 56 | rcu_read_lock(); |
| 57 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
| 58 | if (delegation != NULL && (delegation->type & flags) == flags) { |
| 59 | nfs_mark_delegation_referenced(delegation); |
| 60 | ret = 1; |
| 61 | } |
| 62 | rcu_read_unlock(); |
| 63 | return ret; |
| 64 | } |
| 65 | |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 66 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state) |
| 67 | { |
| 68 | struct inode *inode = state->inode; |
| 69 | struct file_lock *fl; |
Trond Myklebust | d512220 | 2009-06-17 13:22:58 -0700 | [diff] [blame] | 70 | int status = 0; |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 71 | |
Trond Myklebust | 3f09df7 | 2009-06-17 13:23:00 -0700 | [diff] [blame] | 72 | if (inode->i_flock == NULL) |
| 73 | goto out; |
| 74 | |
Arnd Bergmann | b89f432 | 2010-09-18 15:09:31 +0200 | [diff] [blame] | 75 | /* Protect inode->i_flock using the file locks lock */ |
| 76 | lock_flocks(); |
Harvey Harrison | 90dc7d2 | 2008-02-20 13:03:05 -0800 | [diff] [blame] | 77 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 78 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
| 79 | continue; |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 80 | if (nfs_file_open_context(fl->fl_file) != ctx) |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 81 | continue; |
Arnd Bergmann | b89f432 | 2010-09-18 15:09:31 +0200 | [diff] [blame] | 82 | unlock_flocks(); |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 83 | status = nfs4_lock_delegation_recall(state, fl); |
Trond Myklebust | d512220 | 2009-06-17 13:22:58 -0700 | [diff] [blame] | 84 | if (status < 0) |
Trond Myklebust | 3f09df7 | 2009-06-17 13:23:00 -0700 | [diff] [blame] | 85 | goto out; |
Arnd Bergmann | b89f432 | 2010-09-18 15:09:31 +0200 | [diff] [blame] | 86 | lock_flocks(); |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 87 | } |
Arnd Bergmann | b89f432 | 2010-09-18 15:09:31 +0200 | [diff] [blame] | 88 | unlock_flocks(); |
Trond Myklebust | 3f09df7 | 2009-06-17 13:23:00 -0700 | [diff] [blame] | 89 | out: |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 90 | return status; |
| 91 | } |
| 92 | |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 93 | static int nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | { |
| 95 | struct nfs_inode *nfsi = NFS_I(inode); |
| 96 | struct nfs_open_context *ctx; |
| 97 | struct nfs4_state *state; |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 98 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
| 100 | again: |
| 101 | spin_lock(&inode->i_lock); |
| 102 | list_for_each_entry(ctx, &nfsi->open_files, list) { |
| 103 | state = ctx->state; |
| 104 | if (state == NULL) |
| 105 | continue; |
| 106 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) |
| 107 | continue; |
Trond Myklebust | f597c53 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 108 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 109 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | get_nfs_open_context(ctx); |
| 111 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 13437e1 | 2007-07-06 15:10:43 -0400 | [diff] [blame] | 112 | err = nfs4_open_delegation_recall(ctx, state, stateid); |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 113 | if (err >= 0) |
| 114 | err = nfs_delegation_claim_locks(ctx, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | put_nfs_open_context(ctx); |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 116 | if (err != 0) |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 117 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | goto again; |
| 119 | } |
| 120 | spin_unlock(&inode->i_lock); |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 121 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | } |
| 123 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 124 | /** |
| 125 | * nfs_inode_reclaim_delegation - process a delegation reclaim request |
| 126 | * @inode: inode to process |
| 127 | * @cred: credential to use for request |
| 128 | * @res: new delegation state from server |
| 129 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | */ |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 131 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, |
| 132 | struct nfs_openres *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | { |
Trond Myklebust | 8f649c3 | 2010-05-01 12:36:18 -0400 | [diff] [blame] | 134 | struct nfs_delegation *delegation; |
| 135 | struct rpc_cred *oldcred = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
Trond Myklebust | 8f649c3 | 2010-05-01 12:36:18 -0400 | [diff] [blame] | 137 | rcu_read_lock(); |
| 138 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
| 139 | if (delegation != NULL) { |
| 140 | spin_lock(&delegation->lock); |
| 141 | if (delegation->inode != NULL) { |
Trond Myklebust | f597c53 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 142 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
Trond Myklebust | 8f649c3 | 2010-05-01 12:36:18 -0400 | [diff] [blame] | 143 | delegation->type = res->delegation_type; |
| 144 | delegation->maxsize = res->maxsize; |
| 145 | oldcred = delegation->cred; |
| 146 | delegation->cred = get_rpccred(cred); |
| 147 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, |
| 148 | &delegation->flags); |
| 149 | NFS_I(inode)->delegation_state = delegation->type; |
| 150 | spin_unlock(&delegation->lock); |
| 151 | put_rpccred(oldcred); |
| 152 | rcu_read_unlock(); |
| 153 | } else { |
| 154 | /* We appear to have raced with a delegation return. */ |
| 155 | spin_unlock(&delegation->lock); |
| 156 | rcu_read_unlock(); |
| 157 | nfs_inode_set_delegation(inode, cred, res); |
| 158 | } |
| 159 | } else { |
| 160 | rcu_read_unlock(); |
| 161 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | } |
| 163 | |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 164 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
| 165 | { |
| 166 | int res = 0; |
| 167 | |
| 168 | res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync); |
| 169 | nfs_free_delegation(delegation); |
| 170 | return res; |
| 171 | } |
| 172 | |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 173 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
| 174 | { |
| 175 | struct inode *inode = NULL; |
| 176 | |
| 177 | spin_lock(&delegation->lock); |
| 178 | if (delegation->inode != NULL) |
| 179 | inode = igrab(delegation->inode); |
| 180 | spin_unlock(&delegation->lock); |
| 181 | return inode; |
| 182 | } |
| 183 | |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 184 | static struct nfs_delegation * |
| 185 | nfs_detach_delegation_locked(struct nfs_inode *nfsi, |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 186 | struct nfs_server *server) |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 187 | { |
David Howells | 17d2c0a | 2010-05-01 12:37:18 -0400 | [diff] [blame] | 188 | struct nfs_delegation *delegation = |
| 189 | rcu_dereference_protected(nfsi->delegation, |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 190 | lockdep_is_held(&server->nfs_client->cl_lock)); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 191 | |
| 192 | if (delegation == NULL) |
| 193 | goto nomatch; |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 194 | |
Trond Myklebust | 3431043 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 195 | spin_lock(&delegation->lock); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 196 | list_del_rcu(&delegation->super_list); |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 197 | delegation->inode = NULL; |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 198 | nfsi->delegation_state = 0; |
| 199 | rcu_assign_pointer(nfsi->delegation, NULL); |
Trond Myklebust | 3431043 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 200 | spin_unlock(&delegation->lock); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 201 | return delegation; |
| 202 | nomatch: |
| 203 | return NULL; |
| 204 | } |
| 205 | |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 206 | static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi, |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 207 | struct nfs_server *server) |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 208 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 209 | struct nfs_client *clp = server->nfs_client; |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 210 | struct nfs_delegation *delegation; |
| 211 | |
| 212 | spin_lock(&clp->cl_lock); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 213 | delegation = nfs_detach_delegation_locked(nfsi, server); |
Chuck Lever | dda4b22 | 2010-12-24 01:32:54 +0000 | [diff] [blame] | 214 | spin_unlock(&clp->cl_lock); |
| 215 | return delegation; |
| 216 | } |
| 217 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 218 | /** |
| 219 | * nfs_inode_set_delegation - set up a delegation on an inode |
| 220 | * @inode: inode to which delegation applies |
| 221 | * @cred: cred to use for subsequent delegation processing |
| 222 | * @res: new delegation state from server |
| 223 | * |
| 224 | * Returns zero on success, or a negative errno value. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | */ |
| 226 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) |
| 227 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 228 | struct nfs_server *server = NFS_SERVER(inode); |
| 229 | struct nfs_client *clp = server->nfs_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | struct nfs_inode *nfsi = NFS_I(inode); |
David Howells | 17d2c0a | 2010-05-01 12:37:18 -0400 | [diff] [blame] | 231 | struct nfs_delegation *delegation, *old_delegation; |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 232 | struct nfs_delegation *freeme = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | int status = 0; |
| 234 | |
Trond Myklebust | 8535b2b | 2010-05-13 12:51:01 -0400 | [diff] [blame] | 235 | delegation = kmalloc(sizeof(*delegation), GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | if (delegation == NULL) |
| 237 | return -ENOMEM; |
Trond Myklebust | f597c53 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 238 | nfs4_stateid_copy(&delegation->stateid, &res->delegation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | delegation->type = res->delegation_type; |
| 240 | delegation->maxsize = res->maxsize; |
Trond Myklebust | a9a4a87 | 2011-10-17 16:08:46 -0700 | [diff] [blame] | 241 | delegation->change_attr = inode->i_version; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | delegation->cred = get_rpccred(cred); |
| 243 | delegation->inode = inode; |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 244 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
Trond Myklebust | 3431043 | 2008-12-23 15:21:38 -0500 | [diff] [blame] | 245 | spin_lock_init(&delegation->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
| 247 | spin_lock(&clp->cl_lock); |
David Howells | 17d2c0a | 2010-05-01 12:37:18 -0400 | [diff] [blame] | 248 | old_delegation = rcu_dereference_protected(nfsi->delegation, |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 249 | lockdep_is_held(&clp->cl_lock)); |
David Howells | 17d2c0a | 2010-05-01 12:37:18 -0400 | [diff] [blame] | 250 | if (old_delegation != NULL) { |
Trond Myklebust | f597c53 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 251 | if (nfs4_stateid_match(&delegation->stateid, |
| 252 | &old_delegation->stateid) && |
David Howells | 17d2c0a | 2010-05-01 12:37:18 -0400 | [diff] [blame] | 253 | delegation->type == old_delegation->type) { |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 254 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | } |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 256 | /* |
| 257 | * Deal with broken servers that hand out two |
| 258 | * delegations for the same file. |
Trond Myklebust | 1728017 | 2012-03-11 13:11:00 -0400 | [diff] [blame] | 259 | * Allow for upgrades to a WRITE delegation, but |
| 260 | * nothing else. |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 261 | */ |
| 262 | dfprintk(FILE, "%s: server %s handed out " |
| 263 | "a duplicate delegation!\n", |
Harvey Harrison | 3110ff8 | 2008-05-02 13:42:44 -0700 | [diff] [blame] | 264 | __func__, clp->cl_hostname); |
Trond Myklebust | 1728017 | 2012-03-11 13:11:00 -0400 | [diff] [blame] | 265 | if (delegation->type == old_delegation->type || |
| 266 | !(delegation->type & FMODE_WRITE)) { |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 267 | freeme = delegation; |
| 268 | delegation = NULL; |
| 269 | goto out; |
| 270 | } |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 271 | freeme = nfs_detach_delegation_locked(nfsi, server); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | } |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 273 | list_add_rcu(&delegation->super_list, &server->delegations); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 274 | nfsi->delegation_state = delegation->type; |
| 275 | rcu_assign_pointer(nfsi->delegation, delegation); |
| 276 | delegation = NULL; |
Trond Myklebust | 412c77c | 2007-07-03 16:10:55 -0400 | [diff] [blame] | 277 | |
| 278 | /* Ensure we revalidate the attributes and page cache! */ |
| 279 | spin_lock(&inode->i_lock); |
| 280 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; |
| 281 | spin_unlock(&inode->i_lock); |
| 282 | |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 283 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | 603c83d | 2007-10-18 19:59:20 -0400 | [diff] [blame] | 285 | if (delegation != NULL) |
| 286 | nfs_free_delegation(delegation); |
Trond Myklebust | 57bfa89 | 2008-01-25 16:38:18 -0500 | [diff] [blame] | 287 | if (freeme != NULL) |
| 288 | nfs_do_return_delegation(inode, freeme, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | return status; |
| 290 | } |
| 291 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | /* |
| 293 | * Basic procedure for returning a delegation to the server |
| 294 | */ |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 295 | static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | struct nfs_inode *nfsi = NFS_I(inode); |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 298 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | |
Trond Myklebust | 3f09df7 | 2009-06-17 13:23:00 -0700 | [diff] [blame] | 300 | /* |
| 301 | * Guard against new delegated open/lock/unlock calls and against |
| 302 | * state recovery |
| 303 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | down_write(&nfsi->rwsem); |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 305 | err = nfs_delegation_claim_opens(inode, &delegation->stateid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | up_write(&nfsi->rwsem); |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 307 | if (err) |
| 308 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 310 | err = nfs_do_return_delegation(inode, delegation, issync); |
| 311 | out: |
| 312 | return err; |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 313 | } |
| 314 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 315 | /** |
| 316 | * nfs_client_return_marked_delegations - return previously marked delegations |
| 317 | * @clp: nfs_client to process |
| 318 | * |
| 319 | * Returns zero on success, or a negative errno value. |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 320 | */ |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 321 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 322 | { |
| 323 | struct nfs_delegation *delegation; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 324 | struct nfs_server *server; |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 325 | struct inode *inode; |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 326 | int err = 0; |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 327 | |
| 328 | restart: |
| 329 | rcu_read_lock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 330 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| 331 | list_for_each_entry_rcu(delegation, &server->delegations, |
| 332 | super_list) { |
| 333 | if (!test_and_clear_bit(NFS_DELEGATION_RETURN, |
| 334 | &delegation->flags)) |
| 335 | continue; |
| 336 | inode = nfs_delegation_grab_inode(delegation); |
| 337 | if (inode == NULL) |
| 338 | continue; |
| 339 | delegation = nfs_detach_delegation(NFS_I(inode), |
| 340 | server); |
| 341 | rcu_read_unlock(); |
| 342 | |
| 343 | if (delegation != NULL) { |
| 344 | filemap_flush(inode->i_mapping); |
| 345 | err = __nfs_inode_return_delegation(inode, |
| 346 | delegation, 0); |
| 347 | } |
| 348 | iput(inode); |
| 349 | if (!err) |
| 350 | goto restart; |
| 351 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); |
| 352 | return err; |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 353 | } |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 354 | } |
| 355 | rcu_read_unlock(); |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 356 | return 0; |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 357 | } |
| 358 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 359 | /** |
| 360 | * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens |
| 361 | * @inode: inode to process |
| 362 | * |
| 363 | * Does not protect against delegation reclaims, therefore really only safe |
| 364 | * to be called from nfs4_clear_inode(). |
Trond Myklebust | e6f8107 | 2008-01-24 18:14:34 -0500 | [diff] [blame] | 365 | */ |
| 366 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) |
| 367 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 368 | struct nfs_server *server = NFS_SERVER(inode); |
Trond Myklebust | e6f8107 | 2008-01-24 18:14:34 -0500 | [diff] [blame] | 369 | struct nfs_inode *nfsi = NFS_I(inode); |
| 370 | struct nfs_delegation *delegation; |
| 371 | |
David Howells | 17d2c0a | 2010-05-01 12:37:18 -0400 | [diff] [blame] | 372 | if (rcu_access_pointer(nfsi->delegation) != NULL) { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 373 | delegation = nfs_detach_delegation(nfsi, server); |
Trond Myklebust | e6f8107 | 2008-01-24 18:14:34 -0500 | [diff] [blame] | 374 | if (delegation != NULL) |
| 375 | nfs_do_return_delegation(inode, delegation, 0); |
| 376 | } |
| 377 | } |
| 378 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 379 | /** |
| 380 | * nfs_inode_return_delegation - synchronously return a delegation |
| 381 | * @inode: inode to process |
| 382 | * |
| 383 | * Returns zero on success, or a negative errno value. |
| 384 | */ |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 385 | int nfs_inode_return_delegation(struct inode *inode) |
| 386 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 387 | struct nfs_server *server = NFS_SERVER(inode); |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 388 | struct nfs_inode *nfsi = NFS_I(inode); |
| 389 | struct nfs_delegation *delegation; |
| 390 | int err = 0; |
| 391 | |
David Howells | 17d2c0a | 2010-05-01 12:37:18 -0400 | [diff] [blame] | 392 | if (rcu_access_pointer(nfsi->delegation) != NULL) { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 393 | delegation = nfs_detach_delegation(nfsi, server); |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 394 | if (delegation != NULL) { |
Trond Myklebust | 1b924e5 | 2010-07-31 14:29:06 -0400 | [diff] [blame] | 395 | nfs_wb_all(inode); |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 396 | err = __nfs_inode_return_delegation(inode, delegation, 1); |
| 397 | } |
Trond Myklebust | 9016302 | 2007-07-05 14:55:18 -0400 | [diff] [blame] | 398 | } |
| 399 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | } |
| 401 | |
Trond Myklebust | ed1e621 | 2011-07-25 15:37:29 -0400 | [diff] [blame] | 402 | static void nfs_mark_return_delegation(struct nfs_server *server, |
| 403 | struct nfs_delegation *delegation) |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 404 | { |
| 405 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
Trond Myklebust | ed1e621 | 2011-07-25 15:37:29 -0400 | [diff] [blame] | 406 | set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state); |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 407 | } |
| 408 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 409 | /** |
| 410 | * nfs_super_return_all_delegations - return delegations for one superblock |
| 411 | * @sb: sb to process |
| 412 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | */ |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 414 | void nfs_super_return_all_delegations(struct super_block *sb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 416 | struct nfs_server *server = NFS_SB(sb); |
| 417 | struct nfs_client *clp = server->nfs_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | struct nfs_delegation *delegation; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | |
| 420 | if (clp == NULL) |
| 421 | return; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 422 | |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 423 | rcu_read_lock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 424 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 425 | spin_lock(&delegation->lock); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 426 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 427 | spin_unlock(&delegation->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 429 | rcu_read_unlock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 430 | |
Trond Myklebust | d18cc1f | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 431 | if (nfs_client_return_marked_delegations(clp) != 0) |
| 432 | nfs4_schedule_state_manager(clp); |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 433 | } |
| 434 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 435 | static void nfs_mark_return_all_delegation_types(struct nfs_server *server, |
| 436 | fmode_t flags) |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 437 | { |
| 438 | struct nfs_delegation *delegation; |
| 439 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 440 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
Alexandros Batsakis | c79571a | 2009-12-05 13:20:52 -0500 | [diff] [blame] | 441 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
| 442 | continue; |
| 443 | if (delegation->type & flags) |
Trond Myklebust | ed1e621 | 2011-07-25 15:37:29 -0400 | [diff] [blame] | 444 | nfs_mark_return_delegation(server, delegation); |
Trond Myklebust | 707fb4b | 2008-12-23 15:21:47 -0500 | [diff] [blame] | 445 | } |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 446 | } |
| 447 | |
| 448 | static void nfs_client_mark_return_all_delegation_types(struct nfs_client *clp, |
| 449 | fmode_t flags) |
| 450 | { |
| 451 | struct nfs_server *server; |
| 452 | |
| 453 | rcu_read_lock(); |
| 454 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| 455 | nfs_mark_return_all_delegation_types(server, flags); |
Trond Myklebust | 515d861 | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 456 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | } |
| 458 | |
Trond Myklebust | b0d3ded | 2008-12-23 15:21:50 -0500 | [diff] [blame] | 459 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 460 | { |
Trond Myklebust | b0d3ded | 2008-12-23 15:21:50 -0500 | [diff] [blame] | 461 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) |
| 462 | nfs4_schedule_state_manager(clp); |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 463 | } |
| 464 | |
Trond Myklebust | a1d0b5e | 2012-03-05 19:56:44 -0500 | [diff] [blame] | 465 | void nfs_remove_bad_delegation(struct inode *inode) |
| 466 | { |
| 467 | struct nfs_delegation *delegation; |
| 468 | |
| 469 | delegation = nfs_detach_delegation(NFS_I(inode), NFS_SERVER(inode)); |
| 470 | if (delegation) { |
| 471 | nfs_inode_find_state_and_recover(inode, &delegation->stateid); |
| 472 | nfs_free_delegation(delegation); |
| 473 | } |
| 474 | } |
Andy Adamson | 9cb8196 | 2012-03-07 10:49:41 -0500 | [diff] [blame] | 475 | EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation); |
Trond Myklebust | a1d0b5e | 2012-03-05 19:56:44 -0500 | [diff] [blame] | 476 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 477 | /** |
| 478 | * nfs_expire_all_delegation_types |
| 479 | * @clp: client to process |
| 480 | * @flags: delegation types to expire |
| 481 | * |
| 482 | */ |
Alexandros Batsakis | 31f0960 | 2009-12-05 13:27:02 -0500 | [diff] [blame] | 483 | void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags) |
Alexandros Batsakis | c79571a | 2009-12-05 13:20:52 -0500 | [diff] [blame] | 484 | { |
| 485 | nfs_client_mark_return_all_delegation_types(clp, flags); |
| 486 | nfs_delegation_run_state_manager(clp); |
| 487 | } |
| 488 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 489 | /** |
| 490 | * nfs_expire_all_delegations |
| 491 | * @clp: client to process |
| 492 | * |
| 493 | */ |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 494 | void nfs_expire_all_delegations(struct nfs_client *clp) |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 495 | { |
Alexandros Batsakis | c79571a | 2009-12-05 13:20:52 -0500 | [diff] [blame] | 496 | nfs_expire_all_delegation_types(clp, FMODE_READ|FMODE_WRITE); |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 497 | } |
| 498 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 499 | static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server) |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 500 | { |
| 501 | struct nfs_delegation *delegation; |
| 502 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 503 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 504 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) |
| 505 | continue; |
Trond Myklebust | ed1e621 | 2011-07-25 15:37:29 -0400 | [diff] [blame] | 506 | nfs_mark_return_delegation(server, delegation); |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 507 | } |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 508 | } |
| 509 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 510 | /** |
| 511 | * nfs_expire_unreferenced_delegations - Eliminate unused delegations |
| 512 | * @clp: nfs_client to process |
| 513 | * |
| 514 | */ |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 515 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) |
| 516 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 517 | struct nfs_server *server; |
| 518 | |
| 519 | rcu_read_lock(); |
| 520 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| 521 | nfs_mark_return_unreferenced_delegations(server); |
| 522 | rcu_read_unlock(); |
| 523 | |
Trond Myklebust | b7391f4 | 2008-12-23 15:21:52 -0500 | [diff] [blame] | 524 | nfs_delegation_run_state_manager(clp); |
| 525 | } |
| 526 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 527 | /** |
| 528 | * nfs_async_inode_return_delegation - asynchronously return a delegation |
| 529 | * @inode: inode to process |
Trond Myklebust | 8e663f0 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 530 | * @stateid: state ID information |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 531 | * |
| 532 | * Returns zero on success, or a negative errno value. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | */ |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 534 | int nfs_async_inode_return_delegation(struct inode *inode, |
| 535 | const nfs4_stateid *stateid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | { |
Trond Myklebust | ed1e621 | 2011-07-25 15:37:29 -0400 | [diff] [blame] | 537 | struct nfs_server *server = NFS_SERVER(inode); |
| 538 | struct nfs_client *clp = server->nfs_client; |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 539 | struct nfs_delegation *delegation; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 541 | rcu_read_lock(); |
| 542 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
Alexandros Batsakis | 2597641 | 2009-12-05 13:48:55 -0500 | [diff] [blame] | 543 | |
Trond Myklebust | 36281ca | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 544 | if (!clp->cl_mvops->match_stateid(&delegation->stateid, stateid)) { |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 545 | rcu_read_unlock(); |
| 546 | return -ENOENT; |
| 547 | } |
Trond Myklebust | ed1e621 | 2011-07-25 15:37:29 -0400 | [diff] [blame] | 548 | nfs_mark_return_delegation(server, delegation); |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 549 | rcu_read_unlock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 550 | |
Trond Myklebust | 6411bd4 | 2008-12-23 15:21:51 -0500 | [diff] [blame] | 551 | nfs_delegation_run_state_manager(clp); |
| 552 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | } |
| 554 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 555 | static struct inode * |
| 556 | nfs_delegation_find_inode_server(struct nfs_server *server, |
| 557 | const struct nfs_fh *fhandle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | { |
| 559 | struct nfs_delegation *delegation; |
| 560 | struct inode *res = NULL; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 561 | |
| 562 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 563 | spin_lock(&delegation->lock); |
| 564 | if (delegation->inode != NULL && |
| 565 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | res = igrab(delegation->inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | } |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 568 | spin_unlock(&delegation->lock); |
| 569 | if (res != NULL) |
| 570 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | } |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 572 | return res; |
| 573 | } |
| 574 | |
| 575 | /** |
| 576 | * nfs_delegation_find_inode - retrieve the inode associated with a delegation |
| 577 | * @clp: client state handle |
| 578 | * @fhandle: filehandle from a delegation recall |
| 579 | * |
| 580 | * Returns pointer to inode matching "fhandle," or NULL if a matching inode |
| 581 | * cannot be found. |
| 582 | */ |
| 583 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, |
| 584 | const struct nfs_fh *fhandle) |
| 585 | { |
| 586 | struct nfs_server *server; |
| 587 | struct inode *res = NULL; |
| 588 | |
| 589 | rcu_read_lock(); |
| 590 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| 591 | res = nfs_delegation_find_inode_server(server, fhandle); |
| 592 | if (res != NULL) |
| 593 | break; |
| 594 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 595 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | return res; |
| 597 | } |
| 598 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 599 | static void nfs_delegation_mark_reclaim_server(struct nfs_server *server) |
| 600 | { |
| 601 | struct nfs_delegation *delegation; |
| 602 | |
| 603 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) |
| 604 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); |
| 605 | } |
| 606 | |
| 607 | /** |
| 608 | * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed |
| 609 | * @clp: nfs_client to process |
| 610 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | */ |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 612 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | { |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 614 | struct nfs_server *server; |
| 615 | |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 616 | rcu_read_lock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 617 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| 618 | nfs_delegation_mark_reclaim_server(server); |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 619 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | } |
| 621 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 622 | /** |
| 623 | * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done |
| 624 | * @clp: nfs_client to process |
| 625 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | */ |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 627 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | { |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 629 | struct nfs_delegation *delegation; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 630 | struct nfs_server *server; |
Trond Myklebust | 86e8948 | 2008-12-23 15:21:39 -0500 | [diff] [blame] | 631 | struct inode *inode; |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 632 | |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 633 | restart: |
| 634 | rcu_read_lock(); |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 635 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| 636 | list_for_each_entry_rcu(delegation, &server->delegations, |
| 637 | super_list) { |
| 638 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, |
| 639 | &delegation->flags) == 0) |
| 640 | continue; |
| 641 | inode = nfs_delegation_grab_inode(delegation); |
| 642 | if (inode == NULL) |
| 643 | continue; |
| 644 | delegation = nfs_detach_delegation(NFS_I(inode), |
| 645 | server); |
| 646 | rcu_read_unlock(); |
| 647 | |
| 648 | if (delegation != NULL) |
| 649 | nfs_free_delegation(delegation); |
| 650 | iput(inode); |
| 651 | goto restart; |
| 652 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 654 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | } |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 656 | |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 657 | /** |
| 658 | * nfs_delegations_present - check for existence of delegations |
| 659 | * @clp: client state handle |
| 660 | * |
| 661 | * Returns one if there are any nfs_delegation structures attached |
| 662 | * to this nfs_client. |
| 663 | */ |
| 664 | int nfs_delegations_present(struct nfs_client *clp) |
| 665 | { |
| 666 | struct nfs_server *server; |
| 667 | int ret = 0; |
| 668 | |
| 669 | rcu_read_lock(); |
| 670 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| 671 | if (!list_empty(&server->delegations)) { |
| 672 | ret = 1; |
| 673 | break; |
| 674 | } |
| 675 | rcu_read_unlock(); |
| 676 | return ret; |
| 677 | } |
| 678 | |
| 679 | /** |
| 680 | * nfs4_copy_delegation_stateid - Copy inode's state ID information |
| 681 | * @dst: stateid data structure to fill in |
| 682 | * @inode: inode to check |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 683 | * @flags: delegation type requirement |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 684 | * |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 685 | * Returns "true" and fills in "dst->data" * if inode had a delegation, |
| 686 | * otherwise "false" is returned. |
Chuck Lever | d3978bb | 2010-12-24 01:33:04 +0000 | [diff] [blame] | 687 | */ |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 688 | bool nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode, |
| 689 | fmode_t flags) |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 690 | { |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 691 | struct nfs_inode *nfsi = NFS_I(inode); |
| 692 | struct nfs_delegation *delegation; |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 693 | bool ret; |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 694 | |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 695 | flags &= FMODE_READ|FMODE_WRITE; |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 696 | rcu_read_lock(); |
| 697 | delegation = rcu_dereference(nfsi->delegation); |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 698 | ret = (delegation != NULL && (delegation->type & flags) == flags); |
| 699 | if (ret) { |
Trond Myklebust | f597c53 | 2012-03-04 18:13:56 -0500 | [diff] [blame] | 700 | nfs4_stateid_copy(dst, &delegation->stateid); |
Trond Myklebust | 0032a7a | 2012-03-08 17:16:12 -0500 | [diff] [blame] | 701 | nfs_mark_delegation_referenced(delegation); |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 702 | } |
Trond Myklebust | 8383e46 | 2007-07-06 15:12:04 -0400 | [diff] [blame] | 703 | rcu_read_unlock(); |
| 704 | return ret; |
Trond Myklebust | 3e4f629 | 2006-03-20 13:44:46 -0500 | [diff] [blame] | 705 | } |