Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 1 | /* -*- mode: c; c-basic-offset: 8; -*- |
| 2 | * vim: noexpandtab sw=8 ts=8 sts=0: |
| 3 | * |
| 4 | * stackglue.c |
| 5 | * |
| 6 | * Code which implements an OCFS2 specific interface to underlying |
| 7 | * cluster stacks. |
| 8 | * |
| 9 | * Copyright (C) 2007 Oracle. All rights reserved. |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public |
| 13 | * License as published by the Free Software Foundation, version 2. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * General Public License for more details. |
| 19 | */ |
| 20 | |
Joel Becker | 7431cd7 | 2008-02-01 12:15:37 -0800 | [diff] [blame] | 21 | #include "cluster/masklog.h" |
Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 22 | #include "stackglue.h" |
| 23 | |
| 24 | static struct ocfs2_locking_protocol *lproto; |
| 25 | |
Joel Becker | bd3e761 | 2008-02-01 12:14:57 -0800 | [diff] [blame] | 26 | /* These should be identical */ |
| 27 | #if (DLM_LOCK_IV != LKM_IVMODE) |
| 28 | # error Lock modes do not match |
| 29 | #endif |
| 30 | #if (DLM_LOCK_NL != LKM_NLMODE) |
| 31 | # error Lock modes do not match |
| 32 | #endif |
| 33 | #if (DLM_LOCK_CR != LKM_CRMODE) |
| 34 | # error Lock modes do not match |
| 35 | #endif |
| 36 | #if (DLM_LOCK_CW != LKM_CWMODE) |
| 37 | # error Lock modes do not match |
| 38 | #endif |
| 39 | #if (DLM_LOCK_PR != LKM_PRMODE) |
| 40 | # error Lock modes do not match |
| 41 | #endif |
| 42 | #if (DLM_LOCK_PW != LKM_PWMODE) |
| 43 | # error Lock modes do not match |
| 44 | #endif |
| 45 | #if (DLM_LOCK_EX != LKM_EXMODE) |
| 46 | # error Lock modes do not match |
| 47 | #endif |
| 48 | static inline int mode_to_o2dlm(int mode) |
| 49 | { |
| 50 | BUG_ON(mode > LKM_MAXMODE); |
| 51 | |
| 52 | return mode; |
| 53 | } |
| 54 | |
| 55 | #define map_flag(_generic, _o2dlm) \ |
| 56 | if (flags & (_generic)) { \ |
| 57 | flags &= ~(_generic); \ |
| 58 | o2dlm_flags |= (_o2dlm); \ |
| 59 | } |
| 60 | static int flags_to_o2dlm(u32 flags) |
| 61 | { |
| 62 | int o2dlm_flags = 0; |
| 63 | |
| 64 | map_flag(DLM_LKF_NOQUEUE, LKM_NOQUEUE); |
| 65 | map_flag(DLM_LKF_CANCEL, LKM_CANCEL); |
| 66 | map_flag(DLM_LKF_CONVERT, LKM_CONVERT); |
| 67 | map_flag(DLM_LKF_VALBLK, LKM_VALBLK); |
| 68 | map_flag(DLM_LKF_IVVALBLK, LKM_INVVALBLK); |
| 69 | map_flag(DLM_LKF_ORPHAN, LKM_ORPHAN); |
| 70 | map_flag(DLM_LKF_FORCEUNLOCK, LKM_FORCE); |
| 71 | map_flag(DLM_LKF_TIMEOUT, LKM_TIMEOUT); |
| 72 | map_flag(DLM_LKF_LOCAL, LKM_LOCAL); |
| 73 | |
| 74 | /* map_flag() should have cleared every flag passed in */ |
| 75 | BUG_ON(flags != 0); |
| 76 | |
| 77 | return o2dlm_flags; |
| 78 | } |
| 79 | #undef map_flag |
| 80 | |
Joel Becker | 7431cd7 | 2008-02-01 12:15:37 -0800 | [diff] [blame] | 81 | /* |
| 82 | * Map an o2dlm status to standard errno values. |
| 83 | * |
| 84 | * o2dlm only uses a handful of these, and returns even fewer to the |
| 85 | * caller. Still, we try to assign sane values to each error. |
| 86 | * |
| 87 | * The following value pairs have special meanings to dlmglue, thus |
| 88 | * the right hand side needs to stay unique - never duplicate the |
| 89 | * mapping elsewhere in the table! |
| 90 | * |
| 91 | * DLM_NORMAL: 0 |
| 92 | * DLM_NOTQUEUED: -EAGAIN |
| 93 | * DLM_CANCELGRANT: -DLM_ECANCEL |
| 94 | * DLM_CANCEL: -DLM_EUNLOCK |
| 95 | */ |
| 96 | /* Keep in sync with dlmapi.h */ |
| 97 | static int status_map[] = { |
| 98 | [DLM_NORMAL] = 0, /* Success */ |
| 99 | [DLM_GRANTED] = -EINVAL, |
| 100 | [DLM_DENIED] = -EACCES, |
| 101 | [DLM_DENIED_NOLOCKS] = -EACCES, |
| 102 | [DLM_WORKING] = -EBUSY, |
| 103 | [DLM_BLOCKED] = -EINVAL, |
| 104 | [DLM_BLOCKED_ORPHAN] = -EINVAL, |
| 105 | [DLM_DENIED_GRACE_PERIOD] = -EACCES, |
| 106 | [DLM_SYSERR] = -ENOMEM, /* It is what it is */ |
| 107 | [DLM_NOSUPPORT] = -EPROTO, |
| 108 | [DLM_CANCELGRANT] = -DLM_ECANCEL, /* Cancel after grant */ |
| 109 | [DLM_IVLOCKID] = -EINVAL, |
| 110 | [DLM_SYNC] = -EINVAL, |
| 111 | [DLM_BADTYPE] = -EINVAL, |
| 112 | [DLM_BADRESOURCE] = -EINVAL, |
| 113 | [DLM_MAXHANDLES] = -ENOMEM, |
| 114 | [DLM_NOCLINFO] = -EINVAL, |
| 115 | [DLM_NOLOCKMGR] = -EINVAL, |
| 116 | [DLM_NOPURGED] = -EINVAL, |
| 117 | [DLM_BADARGS] = -EINVAL, |
| 118 | [DLM_VOID] = -EINVAL, |
| 119 | [DLM_NOTQUEUED] = -EAGAIN, /* Trylock failed */ |
| 120 | [DLM_IVBUFLEN] = -EINVAL, |
| 121 | [DLM_CVTUNGRANT] = -EPERM, |
| 122 | [DLM_BADPARAM] = -EINVAL, |
| 123 | [DLM_VALNOTVALID] = -EINVAL, |
| 124 | [DLM_REJECTED] = -EPERM, |
| 125 | [DLM_ABORT] = -EINVAL, |
| 126 | [DLM_CANCEL] = -DLM_EUNLOCK, /* Successful cancel */ |
| 127 | [DLM_IVRESHANDLE] = -EINVAL, |
| 128 | [DLM_DEADLOCK] = -EDEADLK, |
| 129 | [DLM_DENIED_NOASTS] = -EINVAL, |
| 130 | [DLM_FORWARD] = -EINVAL, |
| 131 | [DLM_TIMEOUT] = -ETIMEDOUT, |
| 132 | [DLM_IVGROUPID] = -EINVAL, |
| 133 | [DLM_VERS_CONFLICT] = -EOPNOTSUPP, |
| 134 | [DLM_BAD_DEVICE_PATH] = -ENOENT, |
| 135 | [DLM_NO_DEVICE_PERMISSION] = -EPERM, |
| 136 | [DLM_NO_CONTROL_DEVICE] = -ENOENT, |
| 137 | [DLM_RECOVERING] = -ENOTCONN, |
| 138 | [DLM_MIGRATING] = -ERESTART, |
| 139 | [DLM_MAXSTATS] = -EINVAL, |
| 140 | }; |
| 141 | static int dlm_status_to_errno(enum dlm_status status) |
| 142 | { |
| 143 | BUG_ON(status > (sizeof(status_map) / sizeof(status_map[0]))); |
| 144 | |
| 145 | return status_map[status]; |
| 146 | } |
| 147 | |
| 148 | static void o2dlm_lock_ast_wrapper(void *astarg) |
| 149 | { |
| 150 | BUG_ON(lproto == NULL); |
| 151 | |
| 152 | lproto->lp_lock_ast(astarg); |
| 153 | } |
| 154 | |
| 155 | static void o2dlm_blocking_ast_wrapper(void *astarg, int level) |
| 156 | { |
| 157 | BUG_ON(lproto == NULL); |
| 158 | |
| 159 | lproto->lp_blocking_ast(astarg, level); |
| 160 | } |
| 161 | |
| 162 | static void o2dlm_unlock_ast_wrapper(void *astarg, enum dlm_status status) |
| 163 | { |
| 164 | int error; |
| 165 | |
| 166 | BUG_ON(lproto == NULL); |
| 167 | |
| 168 | /* |
| 169 | * XXX: CANCEL values are sketchy. |
| 170 | * |
| 171 | * Currently we have preserved the o2dlm paradigm. You can get |
| 172 | * unlock_ast() whether the cancel succeded or not. |
| 173 | * |
| 174 | * First, we're going to pass DLM_EUNLOCK just like fs/dlm does for |
| 175 | * successful unlocks. That is a clean behavior. |
| 176 | * |
| 177 | * In o2dlm, you can get both the lock_ast() for the lock being |
| 178 | * granted and the unlock_ast() for the CANCEL failing. A |
| 179 | * successful cancel sends DLM_NORMAL here. If the |
| 180 | * lock grant happened before the cancel arrived, you get |
| 181 | * DLM_CANCELGRANT. For now, we'll use DLM_ECANCEL to signify |
| 182 | * CANCELGRANT - the CANCEL was supposed to happen but didn't. We |
| 183 | * can then use DLM_EUNLOCK to signify a successful CANCEL - |
| 184 | * effectively, the CANCEL caused the lock to roll back. |
| 185 | * |
| 186 | * In the future, we will likely move the o2dlm to send only one |
| 187 | * ast - either unlock_ast() for a successful CANCEL or lock_ast() |
| 188 | * when the grant succeeds. At that point, we'll send DLM_ECANCEL |
| 189 | * for all cancel results (CANCELGRANT will no longer exist). |
| 190 | */ |
| 191 | error = dlm_status_to_errno(status); |
| 192 | |
| 193 | /* Successful unlock is DLM_EUNLOCK */ |
| 194 | if (!error) |
| 195 | error = -DLM_EUNLOCK; |
| 196 | |
| 197 | lproto->lp_unlock_ast(astarg, error); |
| 198 | } |
| 199 | |
| 200 | int ocfs2_dlm_lock(struct dlm_ctxt *dlm, |
Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 201 | int mode, |
Joel Becker | 8f2c9c1 | 2008-02-01 12:16:57 -0800 | [diff] [blame^] | 202 | union ocfs2_dlm_lksb *lksb, |
Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 203 | u32 flags, |
| 204 | void *name, |
| 205 | unsigned int namelen, |
| 206 | void *astarg) |
| 207 | { |
Joel Becker | 7431cd7 | 2008-02-01 12:15:37 -0800 | [diff] [blame] | 208 | enum dlm_status status; |
Joel Becker | bd3e761 | 2008-02-01 12:14:57 -0800 | [diff] [blame] | 209 | int o2dlm_mode = mode_to_o2dlm(mode); |
| 210 | int o2dlm_flags = flags_to_o2dlm(flags); |
Joel Becker | 7431cd7 | 2008-02-01 12:15:37 -0800 | [diff] [blame] | 211 | int ret; |
Joel Becker | bd3e761 | 2008-02-01 12:14:57 -0800 | [diff] [blame] | 212 | |
Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 213 | BUG_ON(lproto == NULL); |
Joel Becker | bd3e761 | 2008-02-01 12:14:57 -0800 | [diff] [blame] | 214 | |
Joel Becker | 8f2c9c1 | 2008-02-01 12:16:57 -0800 | [diff] [blame^] | 215 | status = dlmlock(dlm, o2dlm_mode, &lksb->lksb_o2dlm, o2dlm_flags, |
| 216 | name, namelen, |
| 217 | o2dlm_lock_ast_wrapper, astarg, |
| 218 | o2dlm_blocking_ast_wrapper); |
Joel Becker | 7431cd7 | 2008-02-01 12:15:37 -0800 | [diff] [blame] | 219 | ret = dlm_status_to_errno(status); |
| 220 | return ret; |
Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 221 | } |
| 222 | |
Joel Becker | 7431cd7 | 2008-02-01 12:15:37 -0800 | [diff] [blame] | 223 | int ocfs2_dlm_unlock(struct dlm_ctxt *dlm, |
Joel Becker | 8f2c9c1 | 2008-02-01 12:16:57 -0800 | [diff] [blame^] | 224 | union ocfs2_dlm_lksb *lksb, |
Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 225 | u32 flags, |
| 226 | void *astarg) |
| 227 | { |
Joel Becker | 7431cd7 | 2008-02-01 12:15:37 -0800 | [diff] [blame] | 228 | enum dlm_status status; |
Joel Becker | bd3e761 | 2008-02-01 12:14:57 -0800 | [diff] [blame] | 229 | int o2dlm_flags = flags_to_o2dlm(flags); |
Joel Becker | 7431cd7 | 2008-02-01 12:15:37 -0800 | [diff] [blame] | 230 | int ret; |
Joel Becker | bd3e761 | 2008-02-01 12:14:57 -0800 | [diff] [blame] | 231 | |
Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 232 | BUG_ON(lproto == NULL); |
| 233 | |
Joel Becker | 8f2c9c1 | 2008-02-01 12:16:57 -0800 | [diff] [blame^] | 234 | status = dlmunlock(dlm, &lksb->lksb_o2dlm, o2dlm_flags, |
| 235 | o2dlm_unlock_ast_wrapper, astarg); |
Joel Becker | 7431cd7 | 2008-02-01 12:15:37 -0800 | [diff] [blame] | 236 | ret = dlm_status_to_errno(status); |
| 237 | return ret; |
Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 238 | } |
| 239 | |
Joel Becker | 8f2c9c1 | 2008-02-01 12:16:57 -0800 | [diff] [blame^] | 240 | int ocfs2_dlm_lock_status(union ocfs2_dlm_lksb *lksb) |
| 241 | { |
| 242 | return dlm_status_to_errno(lksb->lksb_o2dlm.status); |
| 243 | } |
| 244 | |
| 245 | /* |
| 246 | * Why don't we cast to ocfs2_meta_lvb? The "clean" answer is that we |
| 247 | * don't cast at the glue level. The real answer is that the header |
| 248 | * ordering is nigh impossible. |
| 249 | */ |
| 250 | void *ocfs2_dlm_lvb(union ocfs2_dlm_lksb *lksb) |
| 251 | { |
| 252 | return (void *)(lksb->lksb_o2dlm.lvb); |
| 253 | } |
Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 254 | |
| 255 | void o2cb_get_stack(struct ocfs2_locking_protocol *proto) |
| 256 | { |
| 257 | BUG_ON(proto == NULL); |
| 258 | |
| 259 | lproto = proto; |
| 260 | } |
| 261 | |
| 262 | void o2cb_put_stack(void) |
| 263 | { |
| 264 | lproto = NULL; |
| 265 | } |