1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 5 */ 6 7 #ifndef __GLOCK_DOT_H__ 8 #define __GLOCK_DOT_H__ 9 10 #include <linux/sched.h> 11 #include <linux/parser.h> 12 #include "incore.h" 13 #include "util.h" 14 15 /* Options for hostdata parser */ 16 17 enum { 18 Opt_jid, 19 Opt_id, 20 Opt_first, 21 Opt_nodir, 22 Opt_err, 23 }; 24 25 /* 26 * lm_lockname types 27 */ 28 29 #define LM_TYPE_RESERVED 0x00 30 #define LM_TYPE_NONDISK 0x01 31 #define LM_TYPE_INODE 0x02 32 #define LM_TYPE_RGRP 0x03 33 #define LM_TYPE_META 0x04 34 #define LM_TYPE_IOPEN 0x05 35 #define LM_TYPE_FLOCK 0x06 36 #define LM_TYPE_PLOCK 0x07 37 #define LM_TYPE_QUOTA 0x08 38 #define LM_TYPE_JOURNAL 0x09 39 40 /* 41 * lm_lock() states 42 * 43 * SHARED is compatible with SHARED, not with DEFERRED or EX. 44 * DEFERRED is compatible with DEFERRED, not with SHARED or EX. 45 */ 46 47 #define LM_ST_UNLOCKED 0 48 #define LM_ST_EXCLUSIVE 1 49 #define LM_ST_DEFERRED 2 50 #define LM_ST_SHARED 3 51 52 /* 53 * lm_lock() flags 54 * 55 * LM_FLAG_TRY 56 * Don't wait to acquire the lock if it can't be granted immediately. 57 * 58 * LM_FLAG_TRY_1CB 59 * Send one blocking callback if TRY is set and the lock is not granted. 60 * 61 * LM_FLAG_NOEXP 62 * GFS sets this flag on lock requests it makes while doing journal recovery. 63 * These special requests should not be blocked due to the recovery like 64 * ordinary locks would be. 65 * 66 * LM_FLAG_ANY 67 * A SHARED request may also be granted in DEFERRED, or a DEFERRED request may 68 * also be granted in SHARED. The preferred state is whichever is compatible 69 * with other granted locks, or the specified state if no other locks exist. 70 * 71 * LM_FLAG_PRIORITY 72 * Override fairness considerations. Suppose a lock is held in a shared state 73 * and there is a pending request for the deferred state. A shared lock 74 * request with the priority flag would be allowed to bypass the deferred 75 * request and directly join the other shared lock. A shared lock request 76 * without the priority flag might be forced to wait until the deferred 77 * requested had acquired and released the lock. 78 * 79 * LM_FLAG_NODE_SCOPE 80 * This holder agrees to share the lock within this node. In other words, 81 * the glock is held in EX mode according to DLM, but local holders on the 82 * same node can share it. 83 */ 84 85 #define LM_FLAG_TRY 0x0001 86 #define LM_FLAG_TRY_1CB 0x0002 87 #define LM_FLAG_NOEXP 0x0004 88 #define LM_FLAG_ANY 0x0008 89 #define LM_FLAG_PRIORITY 0x0010 90 #define LM_FLAG_NODE_SCOPE 0x0020 91 #define GL_ASYNC 0x0040 92 #define GL_EXACT 0x0080 93 #define GL_SKIP 0x0100 94 #define GL_NOPID 0x0200 95 #define GL_NOCACHE 0x0400 96 97 /* 98 * lm_async_cb return flags 99 * 100 * LM_OUT_ST_MASK 101 * Masks the lower two bits of lock state in the returned value. 102 * 103 * LM_OUT_CANCELED 104 * The lock request was canceled. 105 * 106 */ 107 108 #define LM_OUT_ST_MASK 0x00000003 109 #define LM_OUT_CANCELED 0x00000008 110 #define LM_OUT_ERROR 0x00000004 111 112 /* 113 * lm_recovery_done() messages 114 */ 115 116 #define LM_RD_GAVEUP 308 117 #define LM_RD_SUCCESS 309 118 119 #define GLR_TRYFAILED 13 120 121 #define GL_GLOCK_MAX_HOLD (long)(HZ / 5) 122 #define GL_GLOCK_DFT_HOLD (long)(HZ / 5) 123 #define GL_GLOCK_MIN_HOLD (long)(10) 124 #define GL_GLOCK_HOLD_INCR (long)(HZ / 20) 125 #define GL_GLOCK_HOLD_DECR (long)(HZ / 40) 126 127 struct lm_lockops { 128 const char *lm_proto_name; 129 int (*lm_mount) (struct gfs2_sbd *sdp, const char *table); 130 void (*lm_first_done) (struct gfs2_sbd *sdp); 131 void (*lm_recovery_result) (struct gfs2_sbd *sdp, unsigned int jid, 132 unsigned int result); 133 void (*lm_unmount) (struct gfs2_sbd *sdp); 134 void (*lm_withdraw) (struct gfs2_sbd *sdp); 135 void (*lm_put_lock) (struct gfs2_glock *gl); 136 int (*lm_lock) (struct gfs2_glock *gl, unsigned int req_state, 137 unsigned int flags); 138 void (*lm_cancel) (struct gfs2_glock *gl); 139 const match_table_t *lm_tokens; 140 }; 141 142 struct gfs2_glock_aspace { 143 struct gfs2_glock glock; 144 struct address_space mapping; 145 }; 146 147 extern struct workqueue_struct *gfs2_delete_workqueue; 148 static inline struct gfs2_holder *gfs2_glock_is_locked_by_me(struct gfs2_glock *gl) 149 { 150 struct gfs2_holder *gh; 151 struct pid *pid; 152 153 /* Look in glock's list of holders for one with current task as owner */ 154 spin_lock(&gl->gl_lockref.lock); 155 pid = task_pid(current); 156 list_for_each_entry(gh, &gl->gl_holders, gh_list) { 157 if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) 158 break; 159 if (gh->gh_owner_pid == pid) 160 goto out; 161 } 162 gh = NULL; 163 out: 164 spin_unlock(&gl->gl_lockref.lock); 165 166 return gh; 167 } 168 169 static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl) 170 { 171 return gl->gl_state == LM_ST_EXCLUSIVE; 172 } 173 174 static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl) 175 { 176 return gl->gl_state == LM_ST_DEFERRED; 177 } 178 179 static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl) 180 { 181 return gl->gl_state == LM_ST_SHARED; 182 } 183 184 static inline struct address_space *gfs2_glock2aspace(struct gfs2_glock *gl) 185 { 186 if (gl->gl_ops->go_flags & GLOF_ASPACE) { 187 struct gfs2_glock_aspace *gla = 188 container_of(gl, struct gfs2_glock_aspace, glock); 189 return &gla->mapping; 190 } 191 return NULL; 192 } 193 194 extern int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, 195 const struct gfs2_glock_operations *glops, 196 int create, struct gfs2_glock **glp); 197 extern struct gfs2_glock *gfs2_glock_hold(struct gfs2_glock *gl); 198 extern void gfs2_glock_put(struct gfs2_glock *gl); 199 extern void gfs2_glock_queue_put(struct gfs2_glock *gl); 200 201 extern void __gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, 202 u16 flags, struct gfs2_holder *gh, 203 unsigned long ip); 204 static inline void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, 205 u16 flags, struct gfs2_holder *gh) { 206 __gfs2_holder_init(gl, state, flags, gh, _RET_IP_); 207 } 208 209 extern void gfs2_holder_reinit(unsigned int state, u16 flags, 210 struct gfs2_holder *gh); 211 extern void gfs2_holder_uninit(struct gfs2_holder *gh); 212 extern int gfs2_glock_nq(struct gfs2_holder *gh); 213 extern int gfs2_glock_poll(struct gfs2_holder *gh); 214 extern int gfs2_instantiate(struct gfs2_holder *gh); 215 extern int gfs2_glock_holder_ready(struct gfs2_holder *gh); 216 extern int gfs2_glock_wait(struct gfs2_holder *gh); 217 extern int gfs2_glock_async_wait(unsigned int num_gh, struct gfs2_holder *ghs); 218 extern void gfs2_glock_dq(struct gfs2_holder *gh); 219 extern void gfs2_glock_dq_wait(struct gfs2_holder *gh); 220 extern void gfs2_glock_dq_uninit(struct gfs2_holder *gh); 221 extern int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, 222 const struct gfs2_glock_operations *glops, 223 unsigned int state, u16 flags, 224 struct gfs2_holder *gh); 225 extern int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs); 226 extern void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs); 227 extern void gfs2_dump_glock(struct seq_file *seq, struct gfs2_glock *gl, 228 bool fsid); 229 #define GLOCK_BUG_ON(gl,x) do { if (unlikely(x)) { \ 230 gfs2_dump_glock(NULL, gl, true); \ 231 BUG(); } } while(0) 232 #define gfs2_glock_assert_warn(gl, x) do { if (unlikely(!(x))) { \ 233 gfs2_dump_glock(NULL, gl, true); \ 234 gfs2_assert_warn((gl)->gl_name.ln_sbd, (x)); } } \ 235 while (0) 236 #define gfs2_glock_assert_withdraw(gl, x) do { if (unlikely(!(x))) { \ 237 gfs2_dump_glock(NULL, gl, true); \ 238 gfs2_assert_withdraw((gl)->gl_name.ln_sbd, (x)); } } \ 239 while (0) 240 241 extern __printf(2, 3) 242 void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...); 243 244 /** 245 * gfs2_glock_nq_init - initialize a holder and enqueue it on a glock 246 * @gl: the glock 247 * @state: the state we're requesting 248 * @flags: the modifier flags 249 * @gh: the holder structure 250 * 251 * Returns: 0, GLR_*, or errno 252 */ 253 254 static inline int gfs2_glock_nq_init(struct gfs2_glock *gl, 255 unsigned int state, u16 flags, 256 struct gfs2_holder *gh) 257 { 258 int error; 259 260 __gfs2_holder_init(gl, state, flags, gh, _RET_IP_); 261 262 error = gfs2_glock_nq(gh); 263 if (error) 264 gfs2_holder_uninit(gh); 265 266 return error; 267 } 268 269 extern void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state); 270 extern void gfs2_glock_complete(struct gfs2_glock *gl, int ret); 271 extern bool gfs2_queue_delete_work(struct gfs2_glock *gl, unsigned long delay); 272 extern void gfs2_cancel_delete_work(struct gfs2_glock *gl); 273 extern bool gfs2_delete_work_queued(const struct gfs2_glock *gl); 274 extern void gfs2_flush_delete_work(struct gfs2_sbd *sdp); 275 extern void gfs2_gl_hash_clear(struct gfs2_sbd *sdp); 276 extern void gfs2_gl_dq_holders(struct gfs2_sbd *sdp); 277 extern void gfs2_glock_thaw(struct gfs2_sbd *sdp); 278 extern void gfs2_glock_add_to_lru(struct gfs2_glock *gl); 279 extern void gfs2_glock_free(struct gfs2_glock *gl); 280 281 extern int __init gfs2_glock_init(void); 282 extern void gfs2_glock_exit(void); 283 284 extern void gfs2_create_debugfs_file(struct gfs2_sbd *sdp); 285 extern void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp); 286 extern void gfs2_register_debugfs(void); 287 extern void gfs2_unregister_debugfs(void); 288 289 extern void glock_set_object(struct gfs2_glock *gl, void *object); 290 extern void glock_clear_object(struct gfs2_glock *gl, void *object); 291 292 extern const struct lm_lockops gfs2_dlm_ops; 293 294 static inline void gfs2_holder_mark_uninitialized(struct gfs2_holder *gh) 295 { 296 gh->gh_gl = NULL; 297 } 298 299 static inline bool gfs2_holder_initialized(struct gfs2_holder *gh) 300 { 301 return gh->gh_gl; 302 } 303 304 static inline bool gfs2_holder_queued(struct gfs2_holder *gh) 305 { 306 return !list_empty(&gh->gh_list); 307 } 308 309 extern void gfs2_inode_remember_delete(struct gfs2_glock *gl, u64 generation); 310 extern bool gfs2_inode_already_deleted(struct gfs2_glock *gl, u64 generation); 311 312 #endif /* __GLOCK_DOT_H__ */ 313