David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
Bob Peterson | cf45b75 | 2008-01-31 10:31:39 -0600 | [diff] [blame] | 3 | * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 4 | * |
| 5 | * This copyrighted material is made available to anyone wishing to use, |
| 6 | * modify, copy, or redistribute it subject to the terms and conditions |
Steven Whitehouse | e9fc2aa | 2006-09-01 11:05:15 -0400 | [diff] [blame] | 7 | * of the GNU General Public License version 2. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 8 | */ |
| 9 | |
| 10 | #include <linux/sched.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/spinlock.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 13 | #include <linux/buffer_head.h> |
| 14 | #include <linux/delay.h> |
| 15 | #include <linux/sort.h> |
| 16 | #include <linux/jhash.h> |
Steven Whitehouse | d0dc80d | 2006-03-29 14:36:49 -0500 | [diff] [blame] | 17 | #include <linux/kallsyms.h> |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 18 | #include <linux/gfs2_ondisk.h> |
Steven Whitehouse | 2426443 | 2006-09-11 21:40:30 -0400 | [diff] [blame] | 19 | #include <linux/list.h> |
Steven Whitehouse | fee852e | 2007-01-17 15:33:23 +0000 | [diff] [blame] | 20 | #include <linux/wait.h> |
akpm@linux-foundation.org | 95d97b7 | 2007-03-05 23:10:39 -0800 | [diff] [blame] | 21 | #include <linux/module.h> |
Steven Whitehouse | 61be084 | 2007-01-29 11:51:45 +0000 | [diff] [blame] | 22 | #include <linux/rwsem.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 23 | #include <asm/uaccess.h> |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 24 | #include <linux/seq_file.h> |
| 25 | #include <linux/debugfs.h> |
Steven Whitehouse | 8fbbfd2 | 2007-08-01 13:57:10 +0100 | [diff] [blame] | 26 | #include <linux/kthread.h> |
| 27 | #include <linux/freezer.h> |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 28 | #include <linux/workqueue.h> |
| 29 | #include <linux/jiffies.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 30 | |
| 31 | #include "gfs2.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 32 | #include "incore.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 33 | #include "glock.h" |
| 34 | #include "glops.h" |
| 35 | #include "inode.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 36 | #include "lops.h" |
| 37 | #include "meta_io.h" |
| 38 | #include "quota.h" |
| 39 | #include "super.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 40 | #include "util.h" |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 41 | #include "bmap.h" |
Steven Whitehouse | 6399777 | 2009-06-12 08:49:20 +0100 | [diff] [blame] | 42 | #define CREATE_TRACE_POINTS |
| 43 | #include "trace_gfs2.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 44 | |
Steven Whitehouse | 37b2fa6 | 2006-09-08 13:35:56 -0400 | [diff] [blame] | 45 | struct gfs2_gl_hash_bucket { |
Steven Whitehouse | b639789 | 2006-09-12 10:10:01 -0400 | [diff] [blame] | 46 | struct hlist_head hb_list; |
Steven Whitehouse | 37b2fa6 | 2006-09-08 13:35:56 -0400 | [diff] [blame] | 47 | }; |
| 48 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 49 | struct gfs2_glock_iter { |
| 50 | int hash; /* hash bucket index */ |
| 51 | struct gfs2_sbd *sdp; /* incore superblock */ |
| 52 | struct gfs2_glock *gl; /* current glock struct */ |
| 53 | char string[512]; /* scratch space */ |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 54 | }; |
| 55 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 56 | typedef void (*glock_examiner) (struct gfs2_glock * gl); |
| 57 | |
Adrian Bunk | 08bc2db | 2006-04-28 10:59:12 -0400 | [diff] [blame] | 58 | static int gfs2_dump_lockstate(struct gfs2_sbd *sdp); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 59 | static int __dump_glock(struct seq_file *seq, const struct gfs2_glock *gl); |
| 60 | #define GLOCK_BUG_ON(gl,x) do { if (unlikely(x)) { __dump_glock(NULL, gl); BUG(); } } while(0) |
| 61 | static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target); |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 62 | |
Steven Whitehouse | 61be084 | 2007-01-29 11:51:45 +0000 | [diff] [blame] | 63 | static DECLARE_RWSEM(gfs2_umount_flush_sem); |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 64 | static struct dentry *gfs2_root; |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 65 | static struct workqueue_struct *glock_workqueue; |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 66 | static LIST_HEAD(lru_list); |
| 67 | static atomic_t lru_count = ATOMIC_INIT(0); |
Julia Lawall | eb8374e | 2008-12-25 15:35:27 +0100 | [diff] [blame] | 68 | static DEFINE_SPINLOCK(lru_lock); |
Adrian Bunk | 08bc2db | 2006-04-28 10:59:12 -0400 | [diff] [blame] | 69 | |
Steven Whitehouse | b639789 | 2006-09-12 10:10:01 -0400 | [diff] [blame] | 70 | #define GFS2_GL_HASH_SHIFT 15 |
Steven Whitehouse | 087efdd | 2006-09-09 16:59:11 -0400 | [diff] [blame] | 71 | #define GFS2_GL_HASH_SIZE (1 << GFS2_GL_HASH_SHIFT) |
| 72 | #define GFS2_GL_HASH_MASK (GFS2_GL_HASH_SIZE - 1) |
| 73 | |
Steven Whitehouse | 85d1da6 | 2006-09-07 14:40:21 -0400 | [diff] [blame] | 74 | static struct gfs2_gl_hash_bucket gl_hash_table[GFS2_GL_HASH_SIZE]; |
Robert Peterson | 04b933f | 2007-03-23 17:05:15 -0500 | [diff] [blame] | 75 | static struct dentry *gfs2_root; |
Steven Whitehouse | 087efdd | 2006-09-09 16:59:11 -0400 | [diff] [blame] | 76 | |
| 77 | /* |
| 78 | * Despite what you might think, the numbers below are not arbitrary :-) |
| 79 | * They are taken from the ipv4 routing hash code, which is well tested |
| 80 | * and thus should be nearly optimal. Later on we might tweek the numbers |
| 81 | * but for now this should be fine. |
| 82 | * |
| 83 | * The reason for putting the locks in a separate array from the list heads |
| 84 | * is that we can have fewer locks than list heads and save memory. We use |
| 85 | * the same hash function for both, but with a different hash mask. |
| 86 | */ |
| 87 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || \ |
| 88 | defined(CONFIG_PROVE_LOCKING) |
| 89 | |
| 90 | #ifdef CONFIG_LOCKDEP |
| 91 | # define GL_HASH_LOCK_SZ 256 |
| 92 | #else |
| 93 | # if NR_CPUS >= 32 |
| 94 | # define GL_HASH_LOCK_SZ 4096 |
| 95 | # elif NR_CPUS >= 16 |
| 96 | # define GL_HASH_LOCK_SZ 2048 |
| 97 | # elif NR_CPUS >= 8 |
| 98 | # define GL_HASH_LOCK_SZ 1024 |
| 99 | # elif NR_CPUS >= 4 |
| 100 | # define GL_HASH_LOCK_SZ 512 |
| 101 | # else |
| 102 | # define GL_HASH_LOCK_SZ 256 |
| 103 | # endif |
| 104 | #endif |
| 105 | |
| 106 | /* We never want more locks than chains */ |
| 107 | #if GFS2_GL_HASH_SIZE < GL_HASH_LOCK_SZ |
| 108 | # undef GL_HASH_LOCK_SZ |
| 109 | # define GL_HASH_LOCK_SZ GFS2_GL_HASH_SIZE |
| 110 | #endif |
| 111 | |
| 112 | static rwlock_t gl_hash_locks[GL_HASH_LOCK_SZ]; |
| 113 | |
| 114 | static inline rwlock_t *gl_lock_addr(unsigned int x) |
| 115 | { |
Steven Whitehouse | 9461061 | 2006-09-09 18:59:27 -0400 | [diff] [blame] | 116 | return &gl_hash_locks[x & (GL_HASH_LOCK_SZ-1)]; |
Steven Whitehouse | 087efdd | 2006-09-09 16:59:11 -0400 | [diff] [blame] | 117 | } |
| 118 | #else /* not SMP, so no spinlocks required */ |
Randy Dunlap | 0ac2306 | 2006-11-28 22:29:19 -0800 | [diff] [blame] | 119 | static inline rwlock_t *gl_lock_addr(unsigned int x) |
Steven Whitehouse | 087efdd | 2006-09-09 16:59:11 -0400 | [diff] [blame] | 120 | { |
| 121 | return NULL; |
| 122 | } |
| 123 | #endif |
Steven Whitehouse | 85d1da6 | 2006-09-07 14:40:21 -0400 | [diff] [blame] | 124 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 125 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 126 | * gl_hash() - Turn glock number into hash bucket number |
| 127 | * @lock: The glock number |
| 128 | * |
| 129 | * Returns: The number of the corresponding hash bucket |
| 130 | */ |
| 131 | |
Steven Whitehouse | b854785 | 2006-09-07 13:12:27 -0400 | [diff] [blame] | 132 | static unsigned int gl_hash(const struct gfs2_sbd *sdp, |
| 133 | const struct lm_lockname *name) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 134 | { |
| 135 | unsigned int h; |
| 136 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 137 | h = jhash(&name->ln_number, sizeof(u64), 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 138 | h = jhash(&name->ln_type, sizeof(unsigned int), h); |
Steven Whitehouse | b854785 | 2006-09-07 13:12:27 -0400 | [diff] [blame] | 139 | h = jhash(&sdp, sizeof(struct gfs2_sbd *), h); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 140 | h &= GFS2_GL_HASH_MASK; |
| 141 | |
| 142 | return h; |
| 143 | } |
| 144 | |
| 145 | /** |
| 146 | * glock_free() - Perform a few checks and then release struct gfs2_glock |
| 147 | * @gl: The glock to release |
| 148 | * |
| 149 | * Also calls lock module to release its internal structure for this glock. |
| 150 | * |
| 151 | */ |
| 152 | |
| 153 | static void glock_free(struct gfs2_glock *gl) |
| 154 | { |
| 155 | struct gfs2_sbd *sdp = gl->gl_sbd; |
| 156 | struct inode *aspace = gl->gl_aspace; |
| 157 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 158 | if (aspace) |
| 159 | gfs2_aspace_put(aspace); |
Steven Whitehouse | 6399777 | 2009-06-12 08:49:20 +0100 | [diff] [blame] | 160 | trace_gfs2_glock_put(gl); |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 161 | sdp->sd_lockstruct.ls_ops->lm_put_lock(gfs2_glock_cachep, gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 162 | } |
| 163 | |
| 164 | /** |
| 165 | * gfs2_glock_hold() - increment reference count on glock |
| 166 | * @gl: The glock to hold |
| 167 | * |
| 168 | */ |
| 169 | |
Adrian Bunk | 048786f | 2008-01-29 00:11:34 +0200 | [diff] [blame] | 170 | static void gfs2_glock_hold(struct gfs2_glock *gl) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 171 | { |
Steven Whitehouse | d8348de | 2009-02-05 10:12:38 +0000 | [diff] [blame] | 172 | GLOCK_BUG_ON(gl, atomic_read(&gl->gl_ref) == 0); |
Steven Whitehouse | 16feb9f | 2006-09-13 10:43:37 -0400 | [diff] [blame] | 173 | atomic_inc(&gl->gl_ref); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 174 | } |
| 175 | |
| 176 | /** |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 177 | * gfs2_glock_schedule_for_reclaim - Add a glock to the reclaim list |
| 178 | * @gl: the glock |
| 179 | * |
| 180 | */ |
| 181 | |
| 182 | static void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl) |
| 183 | { |
| 184 | spin_lock(&lru_lock); |
| 185 | if (list_empty(&gl->gl_lru) && gl->gl_state != LM_ST_UNLOCKED) { |
| 186 | list_add_tail(&gl->gl_lru, &lru_list); |
| 187 | atomic_inc(&lru_count); |
| 188 | } |
| 189 | spin_unlock(&lru_lock); |
| 190 | } |
| 191 | |
| 192 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 193 | * gfs2_glock_put() - Decrement reference count on glock |
| 194 | * @gl: The glock to put |
| 195 | * |
| 196 | */ |
| 197 | |
| 198 | int gfs2_glock_put(struct gfs2_glock *gl) |
| 199 | { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 200 | int rv = 0; |
| 201 | |
Steven Whitehouse | 087efdd | 2006-09-09 16:59:11 -0400 | [diff] [blame] | 202 | write_lock(gl_lock_addr(gl->gl_hash)); |
Steven Whitehouse | 16feb9f | 2006-09-13 10:43:37 -0400 | [diff] [blame] | 203 | if (atomic_dec_and_test(&gl->gl_ref)) { |
Steven Whitehouse | b639789 | 2006-09-12 10:10:01 -0400 | [diff] [blame] | 204 | hlist_del(&gl->gl_list); |
Steven Whitehouse | 087efdd | 2006-09-09 16:59:11 -0400 | [diff] [blame] | 205 | write_unlock(gl_lock_addr(gl->gl_hash)); |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 206 | spin_lock(&lru_lock); |
| 207 | if (!list_empty(&gl->gl_lru)) { |
| 208 | list_del_init(&gl->gl_lru); |
| 209 | atomic_dec(&lru_count); |
| 210 | } |
| 211 | spin_unlock(&lru_lock); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 212 | GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 213 | glock_free(gl); |
| 214 | rv = 1; |
| 215 | goto out; |
| 216 | } |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 217 | /* 1 for being hashed, 1 for having state != LM_ST_UNLOCKED */ |
| 218 | if (atomic_read(&gl->gl_ref) == 2) |
| 219 | gfs2_glock_schedule_for_reclaim(gl); |
Steven Whitehouse | d8348de | 2009-02-05 10:12:38 +0000 | [diff] [blame] | 220 | write_unlock(gl_lock_addr(gl->gl_hash)); |
Steven Whitehouse | a2242db | 2006-08-24 17:03:05 -0400 | [diff] [blame] | 221 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 222 | return rv; |
| 223 | } |
| 224 | |
| 225 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 226 | * search_bucket() - Find struct gfs2_glock by lock number |
| 227 | * @bucket: the bucket to search |
| 228 | * @name: The lock name |
| 229 | * |
| 230 | * Returns: NULL, or the struct gfs2_glock with the requested number |
| 231 | */ |
| 232 | |
Steven Whitehouse | 37b2fa6 | 2006-09-08 13:35:56 -0400 | [diff] [blame] | 233 | static struct gfs2_glock *search_bucket(unsigned int hash, |
Steven Whitehouse | 899be4d | 2006-08-30 12:50:28 -0400 | [diff] [blame] | 234 | const struct gfs2_sbd *sdp, |
Steven Whitehouse | d6a5372 | 2006-08-30 11:16:23 -0400 | [diff] [blame] | 235 | const struct lm_lockname *name) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 236 | { |
| 237 | struct gfs2_glock *gl; |
Steven Whitehouse | b639789 | 2006-09-12 10:10:01 -0400 | [diff] [blame] | 238 | struct hlist_node *h; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 239 | |
Steven Whitehouse | b639789 | 2006-09-12 10:10:01 -0400 | [diff] [blame] | 240 | hlist_for_each_entry(gl, h, &gl_hash_table[hash].hb_list, gl_list) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 241 | if (!lm_name_equal(&gl->gl_name, name)) |
| 242 | continue; |
Steven Whitehouse | 899be4d | 2006-08-30 12:50:28 -0400 | [diff] [blame] | 243 | if (gl->gl_sbd != sdp) |
| 244 | continue; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 245 | |
Steven Whitehouse | 16feb9f | 2006-09-13 10:43:37 -0400 | [diff] [blame] | 246 | atomic_inc(&gl->gl_ref); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 247 | |
| 248 | return gl; |
| 249 | } |
| 250 | |
| 251 | return NULL; |
| 252 | } |
| 253 | |
| 254 | /** |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 255 | * may_grant - check if its ok to grant a new lock |
| 256 | * @gl: The glock |
| 257 | * @gh: The lock request which we wish to grant |
| 258 | * |
| 259 | * Returns: true if its ok to grant the lock |
| 260 | */ |
| 261 | |
| 262 | static inline int may_grant(const struct gfs2_glock *gl, const struct gfs2_holder *gh) |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 263 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 264 | const struct gfs2_holder *gh_head = list_entry(gl->gl_holders.next, const struct gfs2_holder, gh_list); |
| 265 | if ((gh->gh_state == LM_ST_EXCLUSIVE || |
| 266 | gh_head->gh_state == LM_ST_EXCLUSIVE) && gh != gh_head) |
| 267 | return 0; |
| 268 | if (gl->gl_state == gh->gh_state) |
| 269 | return 1; |
| 270 | if (gh->gh_flags & GL_EXACT) |
| 271 | return 0; |
Steven Whitehouse | 209806a | 2008-07-07 10:07:28 +0100 | [diff] [blame] | 272 | if (gl->gl_state == LM_ST_EXCLUSIVE) { |
| 273 | if (gh->gh_state == LM_ST_SHARED && gh_head->gh_state == LM_ST_SHARED) |
| 274 | return 1; |
| 275 | if (gh->gh_state == LM_ST_DEFERRED && gh_head->gh_state == LM_ST_DEFERRED) |
| 276 | return 1; |
| 277 | } |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 278 | if (gl->gl_state != LM_ST_UNLOCKED && (gh->gh_flags & LM_FLAG_ANY)) |
| 279 | return 1; |
| 280 | return 0; |
| 281 | } |
| 282 | |
| 283 | static void gfs2_holder_wake(struct gfs2_holder *gh) |
| 284 | { |
| 285 | clear_bit(HIF_WAIT, &gh->gh_iflags); |
| 286 | smp_mb__after_clear_bit(); |
| 287 | wake_up_bit(&gh->gh_iflags, HIF_WAIT); |
| 288 | } |
| 289 | |
| 290 | /** |
| 291 | * do_promote - promote as many requests as possible on the current queue |
| 292 | * @gl: The glock |
| 293 | * |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 294 | * Returns: 1 if there is a blocked holder at the head of the list, or 2 |
| 295 | * if a type specific operation is underway. |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 296 | */ |
| 297 | |
| 298 | static int do_promote(struct gfs2_glock *gl) |
Harvey Harrison | 55ba474 | 2008-10-24 11:31:12 -0700 | [diff] [blame] | 299 | __releases(&gl->gl_spin) |
| 300 | __acquires(&gl->gl_spin) |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 301 | { |
| 302 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
| 303 | struct gfs2_holder *gh, *tmp; |
| 304 | int ret; |
| 305 | |
| 306 | restart: |
| 307 | list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) { |
| 308 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) |
| 309 | continue; |
| 310 | if (may_grant(gl, gh)) { |
| 311 | if (gh->gh_list.prev == &gl->gl_holders && |
| 312 | glops->go_lock) { |
| 313 | spin_unlock(&gl->gl_spin); |
| 314 | /* FIXME: eliminate this eventually */ |
| 315 | ret = glops->go_lock(gh); |
| 316 | spin_lock(&gl->gl_spin); |
| 317 | if (ret) { |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 318 | if (ret == 1) |
| 319 | return 2; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 320 | gh->gh_error = ret; |
| 321 | list_del_init(&gh->gh_list); |
Steven Whitehouse | 6399777 | 2009-06-12 08:49:20 +0100 | [diff] [blame] | 322 | trace_gfs2_glock_queue(gh, 0); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 323 | gfs2_holder_wake(gh); |
| 324 | goto restart; |
| 325 | } |
| 326 | set_bit(HIF_HOLDER, &gh->gh_iflags); |
Steven Whitehouse | 6399777 | 2009-06-12 08:49:20 +0100 | [diff] [blame] | 327 | trace_gfs2_promote(gh, 1); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 328 | gfs2_holder_wake(gh); |
| 329 | goto restart; |
| 330 | } |
| 331 | set_bit(HIF_HOLDER, &gh->gh_iflags); |
Steven Whitehouse | 6399777 | 2009-06-12 08:49:20 +0100 | [diff] [blame] | 332 | trace_gfs2_promote(gh, 0); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 333 | gfs2_holder_wake(gh); |
| 334 | continue; |
| 335 | } |
| 336 | if (gh->gh_list.prev == &gl->gl_holders) |
| 337 | return 1; |
| 338 | break; |
| 339 | } |
| 340 | return 0; |
| 341 | } |
| 342 | |
| 343 | /** |
| 344 | * do_error - Something unexpected has happened during a lock request |
| 345 | * |
| 346 | */ |
| 347 | |
| 348 | static inline void do_error(struct gfs2_glock *gl, const int ret) |
| 349 | { |
| 350 | struct gfs2_holder *gh, *tmp; |
| 351 | |
| 352 | list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) { |
| 353 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) |
| 354 | continue; |
| 355 | if (ret & LM_OUT_ERROR) |
| 356 | gh->gh_error = -EIO; |
| 357 | else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) |
| 358 | gh->gh_error = GLR_TRYFAILED; |
| 359 | else |
| 360 | continue; |
| 361 | list_del_init(&gh->gh_list); |
Steven Whitehouse | 6399777 | 2009-06-12 08:49:20 +0100 | [diff] [blame] | 362 | trace_gfs2_glock_queue(gh, 0); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 363 | gfs2_holder_wake(gh); |
| 364 | } |
| 365 | } |
| 366 | |
| 367 | /** |
| 368 | * find_first_waiter - find the first gh that's waiting for the glock |
| 369 | * @gl: the glock |
| 370 | */ |
| 371 | |
| 372 | static inline struct gfs2_holder *find_first_waiter(const struct gfs2_glock *gl) |
| 373 | { |
| 374 | struct gfs2_holder *gh; |
| 375 | |
| 376 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { |
| 377 | if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) |
| 378 | return gh; |
| 379 | } |
| 380 | return NULL; |
| 381 | } |
| 382 | |
| 383 | /** |
| 384 | * state_change - record that the glock is now in a different state |
| 385 | * @gl: the glock |
| 386 | * @new_state the new state |
| 387 | * |
| 388 | */ |
| 389 | |
| 390 | static void state_change(struct gfs2_glock *gl, unsigned int new_state) |
| 391 | { |
| 392 | int held1, held2; |
| 393 | |
| 394 | held1 = (gl->gl_state != LM_ST_UNLOCKED); |
| 395 | held2 = (new_state != LM_ST_UNLOCKED); |
| 396 | |
| 397 | if (held1 != held2) { |
| 398 | if (held2) |
| 399 | gfs2_glock_hold(gl); |
| 400 | else |
| 401 | gfs2_glock_put(gl); |
| 402 | } |
| 403 | |
| 404 | gl->gl_state = new_state; |
| 405 | gl->gl_tchange = jiffies; |
| 406 | } |
| 407 | |
| 408 | static void gfs2_demote_wake(struct gfs2_glock *gl) |
| 409 | { |
| 410 | gl->gl_demote_state = LM_ST_EXCLUSIVE; |
| 411 | clear_bit(GLF_DEMOTE, &gl->gl_flags); |
| 412 | smp_mb__after_clear_bit(); |
| 413 | wake_up_bit(&gl->gl_flags, GLF_DEMOTE); |
| 414 | } |
| 415 | |
| 416 | /** |
| 417 | * finish_xmote - The DLM has replied to one of our lock requests |
| 418 | * @gl: The glock |
| 419 | * @ret: The status from the DLM |
| 420 | * |
| 421 | */ |
| 422 | |
| 423 | static void finish_xmote(struct gfs2_glock *gl, unsigned int ret) |
| 424 | { |
| 425 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
| 426 | struct gfs2_holder *gh; |
| 427 | unsigned state = ret & LM_OUT_ST_MASK; |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 428 | int rv; |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 429 | |
| 430 | spin_lock(&gl->gl_spin); |
Steven Whitehouse | 6399777 | 2009-06-12 08:49:20 +0100 | [diff] [blame] | 431 | trace_gfs2_glock_state_change(gl, state); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 432 | state_change(gl, state); |
| 433 | gh = find_first_waiter(gl); |
| 434 | |
| 435 | /* Demote to UN request arrived during demote to SH or DF */ |
| 436 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags) && |
| 437 | state != LM_ST_UNLOCKED && gl->gl_demote_state == LM_ST_UNLOCKED) |
| 438 | gl->gl_target = LM_ST_UNLOCKED; |
| 439 | |
| 440 | /* Check for state != intended state */ |
| 441 | if (unlikely(state != gl->gl_target)) { |
| 442 | if (gh && !test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) { |
| 443 | /* move to back of queue and try next entry */ |
| 444 | if (ret & LM_OUT_CANCELED) { |
| 445 | if ((gh->gh_flags & LM_FLAG_PRIORITY) == 0) |
| 446 | list_move_tail(&gh->gh_list, &gl->gl_holders); |
| 447 | gh = find_first_waiter(gl); |
| 448 | gl->gl_target = gh->gh_state; |
| 449 | goto retry; |
| 450 | } |
| 451 | /* Some error or failed "try lock" - report it */ |
| 452 | if ((ret & LM_OUT_ERROR) || |
| 453 | (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) { |
| 454 | gl->gl_target = gl->gl_state; |
| 455 | do_error(gl, ret); |
| 456 | goto out; |
| 457 | } |
| 458 | } |
| 459 | switch(state) { |
| 460 | /* Unlocked due to conversion deadlock, try again */ |
| 461 | case LM_ST_UNLOCKED: |
| 462 | retry: |
| 463 | do_xmote(gl, gh, gl->gl_target); |
| 464 | break; |
| 465 | /* Conversion fails, unlock and try again */ |
| 466 | case LM_ST_SHARED: |
| 467 | case LM_ST_DEFERRED: |
| 468 | do_xmote(gl, gh, LM_ST_UNLOCKED); |
| 469 | break; |
| 470 | default: /* Everything else */ |
| 471 | printk(KERN_ERR "GFS2: wanted %u got %u\n", gl->gl_target, state); |
| 472 | GLOCK_BUG_ON(gl, 1); |
| 473 | } |
| 474 | spin_unlock(&gl->gl_spin); |
| 475 | gfs2_glock_put(gl); |
| 476 | return; |
| 477 | } |
| 478 | |
| 479 | /* Fast path - we got what we asked for */ |
| 480 | if (test_and_clear_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) |
| 481 | gfs2_demote_wake(gl); |
| 482 | if (state != LM_ST_UNLOCKED) { |
| 483 | if (glops->go_xmote_bh) { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 484 | spin_unlock(&gl->gl_spin); |
| 485 | rv = glops->go_xmote_bh(gl, gh); |
| 486 | if (rv == -EAGAIN) |
| 487 | return; |
| 488 | spin_lock(&gl->gl_spin); |
| 489 | if (rv) { |
| 490 | do_error(gl, rv); |
| 491 | goto out; |
| 492 | } |
| 493 | } |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 494 | rv = do_promote(gl); |
| 495 | if (rv == 2) |
| 496 | goto out_locked; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 497 | } |
| 498 | out: |
| 499 | clear_bit(GLF_LOCK, &gl->gl_flags); |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 500 | out_locked: |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 501 | spin_unlock(&gl->gl_spin); |
| 502 | gfs2_glock_put(gl); |
| 503 | } |
| 504 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 505 | static unsigned int gfs2_lm_lock(struct gfs2_sbd *sdp, void *lock, |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 506 | unsigned int req_state, |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 507 | unsigned int flags) |
| 508 | { |
| 509 | int ret = LM_OUT_ERROR; |
Steven Whitehouse | 048bca2 | 2008-05-23 14:46:04 +0100 | [diff] [blame] | 510 | |
| 511 | if (!sdp->sd_lockstruct.ls_ops->lm_lock) |
| 512 | return req_state == LM_ST_UNLOCKED ? 0 : req_state; |
| 513 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 514 | if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 515 | ret = sdp->sd_lockstruct.ls_ops->lm_lock(lock, |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 516 | req_state, flags); |
| 517 | return ret; |
| 518 | } |
| 519 | |
| 520 | /** |
| 521 | * do_xmote - Calls the DLM to change the state of a lock |
| 522 | * @gl: The lock state |
| 523 | * @gh: The holder (only for promotes) |
| 524 | * @target: The target lock state |
| 525 | * |
| 526 | */ |
| 527 | |
| 528 | static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target) |
Harvey Harrison | 55ba474 | 2008-10-24 11:31:12 -0700 | [diff] [blame] | 529 | __releases(&gl->gl_spin) |
| 530 | __acquires(&gl->gl_spin) |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 531 | { |
| 532 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
| 533 | struct gfs2_sbd *sdp = gl->gl_sbd; |
| 534 | unsigned int lck_flags = gh ? gh->gh_flags : 0; |
| 535 | int ret; |
| 536 | |
| 537 | lck_flags &= (LM_FLAG_TRY | LM_FLAG_TRY_1CB | LM_FLAG_NOEXP | |
| 538 | LM_FLAG_PRIORITY); |
| 539 | BUG_ON(gl->gl_state == target); |
| 540 | BUG_ON(gl->gl_state == gl->gl_target); |
| 541 | if ((target == LM_ST_UNLOCKED || target == LM_ST_DEFERRED) && |
| 542 | glops->go_inval) { |
| 543 | set_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags); |
| 544 | do_error(gl, 0); /* Fail queued try locks */ |
| 545 | } |
| 546 | spin_unlock(&gl->gl_spin); |
| 547 | if (glops->go_xmote_th) |
| 548 | glops->go_xmote_th(gl); |
| 549 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) |
| 550 | glops->go_inval(gl, target == LM_ST_DEFERRED ? 0 : DIO_METADATA); |
| 551 | clear_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags); |
| 552 | |
| 553 | gfs2_glock_hold(gl); |
| 554 | if (target != LM_ST_UNLOCKED && (gl->gl_state == LM_ST_SHARED || |
| 555 | gl->gl_state == LM_ST_DEFERRED) && |
| 556 | !(lck_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) |
| 557 | lck_flags |= LM_FLAG_TRY_1CB; |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 558 | ret = gfs2_lm_lock(sdp, gl, target, lck_flags); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 559 | |
| 560 | if (!(ret & LM_OUT_ASYNC)) { |
| 561 | finish_xmote(gl, ret); |
| 562 | gfs2_glock_hold(gl); |
| 563 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
| 564 | gfs2_glock_put(gl); |
| 565 | } else { |
| 566 | GLOCK_BUG_ON(gl, ret != LM_OUT_ASYNC); |
| 567 | } |
| 568 | spin_lock(&gl->gl_spin); |
| 569 | } |
| 570 | |
| 571 | /** |
| 572 | * find_first_holder - find the first "holder" gh |
| 573 | * @gl: the glock |
| 574 | */ |
| 575 | |
| 576 | static inline struct gfs2_holder *find_first_holder(const struct gfs2_glock *gl) |
| 577 | { |
| 578 | struct gfs2_holder *gh; |
| 579 | |
| 580 | if (!list_empty(&gl->gl_holders)) { |
| 581 | gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list); |
| 582 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) |
| 583 | return gh; |
| 584 | } |
| 585 | return NULL; |
| 586 | } |
| 587 | |
| 588 | /** |
| 589 | * run_queue - do all outstanding tasks related to a glock |
| 590 | * @gl: The glock in question |
| 591 | * @nonblock: True if we must not block in run_queue |
| 592 | * |
| 593 | */ |
| 594 | |
| 595 | static void run_queue(struct gfs2_glock *gl, const int nonblock) |
Harvey Harrison | 55ba474 | 2008-10-24 11:31:12 -0700 | [diff] [blame] | 596 | __releases(&gl->gl_spin) |
| 597 | __acquires(&gl->gl_spin) |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 598 | { |
| 599 | struct gfs2_holder *gh = NULL; |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 600 | int ret; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 601 | |
| 602 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) |
| 603 | return; |
| 604 | |
| 605 | GLOCK_BUG_ON(gl, test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)); |
| 606 | |
| 607 | if (test_bit(GLF_DEMOTE, &gl->gl_flags) && |
| 608 | gl->gl_demote_state != gl->gl_state) { |
| 609 | if (find_first_holder(gl)) |
Steven Whitehouse | d8348de | 2009-02-05 10:12:38 +0000 | [diff] [blame] | 610 | goto out_unlock; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 611 | if (nonblock) |
| 612 | goto out_sched; |
| 613 | set_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags); |
Steven Whitehouse | 265d529c | 2008-07-07 10:02:36 +0100 | [diff] [blame] | 614 | GLOCK_BUG_ON(gl, gl->gl_demote_state == LM_ST_EXCLUSIVE); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 615 | gl->gl_target = gl->gl_demote_state; |
| 616 | } else { |
| 617 | if (test_bit(GLF_DEMOTE, &gl->gl_flags)) |
| 618 | gfs2_demote_wake(gl); |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 619 | ret = do_promote(gl); |
| 620 | if (ret == 0) |
Steven Whitehouse | d8348de | 2009-02-05 10:12:38 +0000 | [diff] [blame] | 621 | goto out_unlock; |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 622 | if (ret == 2) |
Steven Whitehouse | a228df6 | 2009-04-07 14:01:34 +0100 | [diff] [blame] | 623 | goto out; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 624 | gh = find_first_waiter(gl); |
| 625 | gl->gl_target = gh->gh_state; |
| 626 | if (!(gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) |
| 627 | do_error(gl, 0); /* Fail queued try locks */ |
| 628 | } |
| 629 | do_xmote(gl, gh, gl->gl_target); |
Steven Whitehouse | a228df6 | 2009-04-07 14:01:34 +0100 | [diff] [blame] | 630 | out: |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 631 | return; |
| 632 | |
| 633 | out_sched: |
| 634 | gfs2_glock_hold(gl); |
| 635 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
| 636 | gfs2_glock_put(gl); |
Steven Whitehouse | d8348de | 2009-02-05 10:12:38 +0000 | [diff] [blame] | 637 | out_unlock: |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 638 | clear_bit(GLF_LOCK, &gl->gl_flags); |
Steven Whitehouse | a228df6 | 2009-04-07 14:01:34 +0100 | [diff] [blame] | 639 | goto out; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 640 | } |
| 641 | |
| 642 | static void glock_work_func(struct work_struct *work) |
| 643 | { |
| 644 | unsigned long delay = 0; |
| 645 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_work.work); |
| 646 | |
| 647 | if (test_and_clear_bit(GLF_REPLY_PENDING, &gl->gl_flags)) |
| 648 | finish_xmote(gl, gl->gl_reply); |
Steven Whitehouse | a228df6 | 2009-04-07 14:01:34 +0100 | [diff] [blame] | 649 | down_read(&gfs2_umount_flush_sem); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 650 | spin_lock(&gl->gl_spin); |
Steven Whitehouse | 265d529c | 2008-07-07 10:02:36 +0100 | [diff] [blame] | 651 | if (test_and_clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && |
| 652 | gl->gl_state != LM_ST_UNLOCKED && |
| 653 | gl->gl_demote_state != LM_ST_EXCLUSIVE) { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 654 | unsigned long holdtime, now = jiffies; |
| 655 | holdtime = gl->gl_tchange + gl->gl_ops->go_min_hold_time; |
| 656 | if (time_before(now, holdtime)) |
| 657 | delay = holdtime - now; |
| 658 | set_bit(delay ? GLF_PENDING_DEMOTE : GLF_DEMOTE, &gl->gl_flags); |
| 659 | } |
| 660 | run_queue(gl, 0); |
| 661 | spin_unlock(&gl->gl_spin); |
Steven Whitehouse | a228df6 | 2009-04-07 14:01:34 +0100 | [diff] [blame] | 662 | up_read(&gfs2_umount_flush_sem); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 663 | if (!delay || |
| 664 | queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) |
| 665 | gfs2_glock_put(gl); |
| 666 | } |
| 667 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 668 | /** |
| 669 | * gfs2_glock_get() - Get a glock, or create one if one doesn't exist |
| 670 | * @sdp: The GFS2 superblock |
| 671 | * @number: the lock number |
| 672 | * @glops: The glock_operations to use |
| 673 | * @create: If 0, don't create the glock if it doesn't exist |
| 674 | * @glp: the glock is returned here |
| 675 | * |
| 676 | * This does not lock a glock, just finds/creates structures for one. |
| 677 | * |
| 678 | * Returns: errno |
| 679 | */ |
| 680 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 681 | int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, |
Steven Whitehouse | 8fb4b53 | 2006-08-30 09:30:00 -0400 | [diff] [blame] | 682 | const struct gfs2_glock_operations *glops, int create, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 683 | struct gfs2_glock **glp) |
| 684 | { |
Steven Whitehouse | 37b2fa6 | 2006-09-08 13:35:56 -0400 | [diff] [blame] | 685 | struct lm_lockname name = { .ln_number = number, .ln_type = glops->go_type }; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 686 | struct gfs2_glock *gl, *tmp; |
Steven Whitehouse | 37b2fa6 | 2006-09-08 13:35:56 -0400 | [diff] [blame] | 687 | unsigned int hash = gl_hash(sdp, &name); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 688 | int error; |
| 689 | |
Steven Whitehouse | 087efdd | 2006-09-09 16:59:11 -0400 | [diff] [blame] | 690 | read_lock(gl_lock_addr(hash)); |
Steven Whitehouse | 37b2fa6 | 2006-09-08 13:35:56 -0400 | [diff] [blame] | 691 | gl = search_bucket(hash, sdp, &name); |
Steven Whitehouse | 087efdd | 2006-09-09 16:59:11 -0400 | [diff] [blame] | 692 | read_unlock(gl_lock_addr(hash)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 693 | |
Steven Whitehouse | 64d576b | 2009-02-12 13:31:58 +0000 | [diff] [blame] | 694 | *glp = gl; |
| 695 | if (gl) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 696 | return 0; |
Steven Whitehouse | 64d576b | 2009-02-12 13:31:58 +0000 | [diff] [blame] | 697 | if (!create) |
| 698 | return -ENOENT; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 699 | |
| 700 | gl = kmem_cache_alloc(gfs2_glock_cachep, GFP_KERNEL); |
| 701 | if (!gl) |
| 702 | return -ENOMEM; |
| 703 | |
Steven Whitehouse | ec45d9f | 2006-08-30 10:36:52 -0400 | [diff] [blame] | 704 | gl->gl_flags = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 705 | gl->gl_name = name; |
Steven Whitehouse | 16feb9f | 2006-09-13 10:43:37 -0400 | [diff] [blame] | 706 | atomic_set(&gl->gl_ref, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 707 | gl->gl_state = LM_ST_UNLOCKED; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 708 | gl->gl_target = LM_ST_UNLOCKED; |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 709 | gl->gl_demote_state = LM_ST_EXCLUSIVE; |
Steven Whitehouse | 37b2fa6 | 2006-09-08 13:35:56 -0400 | [diff] [blame] | 710 | gl->gl_hash = hash; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 711 | gl->gl_ops = glops; |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 712 | snprintf(gl->gl_strname, GDLM_STRNAME_BYTES, "%8x%16llx", name.ln_type, (unsigned long long)number); |
| 713 | memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb)); |
| 714 | gl->gl_lksb.sb_lvbptr = gl->gl_lvb; |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 715 | gl->gl_tchange = jiffies; |
Steven Whitehouse | ec45d9f | 2006-08-30 10:36:52 -0400 | [diff] [blame] | 716 | gl->gl_object = NULL; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 717 | gl->gl_sbd = sdp; |
Steven Whitehouse | ec45d9f | 2006-08-30 10:36:52 -0400 | [diff] [blame] | 718 | gl->gl_aspace = NULL; |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 719 | INIT_DELAYED_WORK(&gl->gl_work, glock_work_func); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 720 | |
| 721 | /* If this glock protects actual on-disk data or metadata blocks, |
| 722 | create a VFS inode to manage the pages/buffers holding them. */ |
Steven Whitehouse | 5029996 | 2006-09-04 09:49:55 -0400 | [diff] [blame] | 723 | if (glops == &gfs2_inode_glops || glops == &gfs2_rgrp_glops) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 724 | gl->gl_aspace = gfs2_aspace_get(sdp); |
| 725 | if (!gl->gl_aspace) { |
| 726 | error = -ENOMEM; |
| 727 | goto fail; |
| 728 | } |
| 729 | } |
| 730 | |
Steven Whitehouse | 087efdd | 2006-09-09 16:59:11 -0400 | [diff] [blame] | 731 | write_lock(gl_lock_addr(hash)); |
Steven Whitehouse | 37b2fa6 | 2006-09-08 13:35:56 -0400 | [diff] [blame] | 732 | tmp = search_bucket(hash, sdp, &name); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 733 | if (tmp) { |
Steven Whitehouse | 087efdd | 2006-09-09 16:59:11 -0400 | [diff] [blame] | 734 | write_unlock(gl_lock_addr(hash)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 735 | glock_free(gl); |
| 736 | gl = tmp; |
| 737 | } else { |
Steven Whitehouse | b639789 | 2006-09-12 10:10:01 -0400 | [diff] [blame] | 738 | hlist_add_head(&gl->gl_list, &gl_hash_table[hash].hb_list); |
Steven Whitehouse | 087efdd | 2006-09-09 16:59:11 -0400 | [diff] [blame] | 739 | write_unlock(gl_lock_addr(hash)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 740 | } |
| 741 | |
| 742 | *glp = gl; |
| 743 | |
| 744 | return 0; |
| 745 | |
Steven Whitehouse | ec45d9f | 2006-08-30 10:36:52 -0400 | [diff] [blame] | 746 | fail: |
Steven Whitehouse | 907b9bc | 2006-09-25 09:26:04 -0400 | [diff] [blame] | 747 | kmem_cache_free(gfs2_glock_cachep, gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 748 | return error; |
| 749 | } |
| 750 | |
| 751 | /** |
| 752 | * gfs2_holder_init - initialize a struct gfs2_holder in the default way |
| 753 | * @gl: the glock |
| 754 | * @state: the state we're requesting |
| 755 | * @flags: the modifier flags |
| 756 | * @gh: the holder structure |
| 757 | * |
| 758 | */ |
| 759 | |
Steven Whitehouse | 190562b | 2006-04-20 16:57:23 -0400 | [diff] [blame] | 760 | void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 761 | struct gfs2_holder *gh) |
| 762 | { |
| 763 | INIT_LIST_HEAD(&gh->gh_list); |
| 764 | gh->gh_gl = gl; |
Steven Whitehouse | d0dc80d | 2006-03-29 14:36:49 -0500 | [diff] [blame] | 765 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
Pavel Emelyanov | b1e058d | 2008-02-07 00:13:19 -0800 | [diff] [blame] | 766 | gh->gh_owner_pid = get_pid(task_pid(current)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 767 | gh->gh_state = state; |
| 768 | gh->gh_flags = flags; |
| 769 | gh->gh_error = 0; |
| 770 | gh->gh_iflags = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 771 | gfs2_glock_hold(gl); |
| 772 | } |
| 773 | |
| 774 | /** |
| 775 | * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it |
| 776 | * @state: the state we're requesting |
| 777 | * @flags: the modifier flags |
| 778 | * @gh: the holder structure |
| 779 | * |
| 780 | * Don't mess with the glock. |
| 781 | * |
| 782 | */ |
| 783 | |
Steven Whitehouse | 190562b | 2006-04-20 16:57:23 -0400 | [diff] [blame] | 784 | void gfs2_holder_reinit(unsigned int state, unsigned flags, struct gfs2_holder *gh) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 785 | { |
| 786 | gh->gh_state = state; |
Steven Whitehouse | 579b78a | 2006-04-26 14:58:26 -0400 | [diff] [blame] | 787 | gh->gh_flags = flags; |
Steven Whitehouse | 3b8249f | 2007-03-16 09:40:31 +0000 | [diff] [blame] | 788 | gh->gh_iflags = 0; |
Steven Whitehouse | d0dc80d | 2006-03-29 14:36:49 -0500 | [diff] [blame] | 789 | gh->gh_ip = (unsigned long)__builtin_return_address(0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 790 | } |
| 791 | |
| 792 | /** |
| 793 | * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference) |
| 794 | * @gh: the holder structure |
| 795 | * |
| 796 | */ |
| 797 | |
| 798 | void gfs2_holder_uninit(struct gfs2_holder *gh) |
| 799 | { |
Pavel Emelyanov | b1e058d | 2008-02-07 00:13:19 -0800 | [diff] [blame] | 800 | put_pid(gh->gh_owner_pid); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 801 | gfs2_glock_put(gh->gh_gl); |
| 802 | gh->gh_gl = NULL; |
Steven Whitehouse | d0dc80d | 2006-03-29 14:36:49 -0500 | [diff] [blame] | 803 | gh->gh_ip = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 804 | } |
| 805 | |
Steven Whitehouse | fe64d51 | 2009-05-19 10:01:18 +0100 | [diff] [blame] | 806 | /** |
| 807 | * gfs2_glock_holder_wait |
| 808 | * @word: unused |
| 809 | * |
| 810 | * This function and gfs2_glock_demote_wait both show up in the WCHAN |
| 811 | * field. Thus I've separated these otherwise identical functions in |
| 812 | * order to be more informative to the user. |
| 813 | */ |
| 814 | |
| 815 | static int gfs2_glock_holder_wait(void *word) |
Steven Whitehouse | fee852e | 2007-01-17 15:33:23 +0000 | [diff] [blame] | 816 | { |
| 817 | schedule(); |
| 818 | return 0; |
| 819 | } |
| 820 | |
Steven Whitehouse | fe64d51 | 2009-05-19 10:01:18 +0100 | [diff] [blame] | 821 | static int gfs2_glock_demote_wait(void *word) |
| 822 | { |
| 823 | schedule(); |
| 824 | return 0; |
| 825 | } |
| 826 | |
Steven Whitehouse | fee852e | 2007-01-17 15:33:23 +0000 | [diff] [blame] | 827 | static void wait_on_holder(struct gfs2_holder *gh) |
| 828 | { |
| 829 | might_sleep(); |
Steven Whitehouse | fe64d51 | 2009-05-19 10:01:18 +0100 | [diff] [blame] | 830 | wait_on_bit(&gh->gh_iflags, HIF_WAIT, gfs2_glock_holder_wait, TASK_UNINTERRUPTIBLE); |
Abhijith Das | d93cfa9 | 2007-06-11 08:22:32 +0100 | [diff] [blame] | 831 | } |
| 832 | |
Abhijith Das | d93cfa9 | 2007-06-11 08:22:32 +0100 | [diff] [blame] | 833 | static void wait_on_demote(struct gfs2_glock *gl) |
| 834 | { |
| 835 | might_sleep(); |
Steven Whitehouse | fe64d51 | 2009-05-19 10:01:18 +0100 | [diff] [blame] | 836 | wait_on_bit(&gl->gl_flags, GLF_DEMOTE, gfs2_glock_demote_wait, TASK_UNINTERRUPTIBLE); |
Steven Whitehouse | fee852e | 2007-01-17 15:33:23 +0000 | [diff] [blame] | 837 | } |
| 838 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 839 | /** |
Steven Whitehouse | 3b8249f | 2007-03-16 09:40:31 +0000 | [diff] [blame] | 840 | * handle_callback - process a demote request |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 841 | * @gl: the glock |
| 842 | * @state: the state the caller wants us to change to |
| 843 | * |
Steven Whitehouse | 3b8249f | 2007-03-16 09:40:31 +0000 | [diff] [blame] | 844 | * There are only two requests that we are going to see in actual |
| 845 | * practise: LM_ST_SHARED and LM_ST_UNLOCKED |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 846 | */ |
| 847 | |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 848 | static void handle_callback(struct gfs2_glock *gl, unsigned int state, |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 849 | unsigned long delay) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 850 | { |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 851 | int bit = delay ? GLF_PENDING_DEMOTE : GLF_DEMOTE; |
| 852 | |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 853 | set_bit(bit, &gl->gl_flags); |
| 854 | if (gl->gl_demote_state == LM_ST_EXCLUSIVE) { |
Steven Whitehouse | 3b8249f | 2007-03-16 09:40:31 +0000 | [diff] [blame] | 855 | gl->gl_demote_state = state; |
| 856 | gl->gl_demote_time = jiffies; |
Josef Whiter | 26caee5 | 2007-07-23 10:02:40 +0100 | [diff] [blame] | 857 | } else if (gl->gl_demote_state != LM_ST_UNLOCKED && |
| 858 | gl->gl_demote_state != state) { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 859 | gl->gl_demote_state = LM_ST_UNLOCKED; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 860 | } |
Steven Whitehouse | 6399777 | 2009-06-12 08:49:20 +0100 | [diff] [blame] | 861 | trace_gfs2_demote_rq(gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 862 | } |
| 863 | |
| 864 | /** |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 865 | * gfs2_glock_wait - wait on a glock acquisition |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 866 | * @gh: the glock holder |
| 867 | * |
| 868 | * Returns: 0 on success |
| 869 | */ |
| 870 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 871 | int gfs2_glock_wait(struct gfs2_holder *gh) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 872 | { |
Steven Whitehouse | fee852e | 2007-01-17 15:33:23 +0000 | [diff] [blame] | 873 | wait_on_holder(gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 874 | return gh->gh_error; |
| 875 | } |
| 876 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 877 | void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...) |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 878 | { |
| 879 | va_list args; |
| 880 | |
| 881 | va_start(args, fmt); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 882 | if (seq) { |
| 883 | struct gfs2_glock_iter *gi = seq->private; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 884 | vsprintf(gi->string, fmt, args); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 885 | seq_printf(seq, gi->string); |
| 886 | } else { |
| 887 | printk(KERN_ERR " "); |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 888 | vprintk(fmt, args); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 889 | } |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 890 | va_end(args); |
| 891 | } |
| 892 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 893 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 894 | * add_to_queue - Add a holder to the wait queue (but look for recursion) |
| 895 | * @gh: the holder structure to add |
| 896 | * |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 897 | * Eventually we should move the recursive locking trap to a |
| 898 | * debugging option or something like that. This is the fast |
| 899 | * path and needs to have the minimum number of distractions. |
| 900 | * |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 901 | */ |
| 902 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 903 | static inline void add_to_queue(struct gfs2_holder *gh) |
Harvey Harrison | 55ba474 | 2008-10-24 11:31:12 -0700 | [diff] [blame] | 904 | __releases(&gl->gl_spin) |
| 905 | __acquires(&gl->gl_spin) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 906 | { |
| 907 | struct gfs2_glock *gl = gh->gh_gl; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 908 | struct gfs2_sbd *sdp = gl->gl_sbd; |
| 909 | struct list_head *insert_pt = NULL; |
| 910 | struct gfs2_holder *gh2; |
| 911 | int try_lock = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 912 | |
Pavel Emelyanov | b1e058d | 2008-02-07 00:13:19 -0800 | [diff] [blame] | 913 | BUG_ON(gh->gh_owner_pid == NULL); |
Steven Whitehouse | fee852e | 2007-01-17 15:33:23 +0000 | [diff] [blame] | 914 | if (test_and_set_bit(HIF_WAIT, &gh->gh_iflags)) |
| 915 | BUG(); |
Steven Whitehouse | 190562b | 2006-04-20 16:57:23 -0400 | [diff] [blame] | 916 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 917 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { |
| 918 | if (test_bit(GLF_LOCK, &gl->gl_flags)) |
| 919 | try_lock = 1; |
| 920 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) |
| 921 | goto fail; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 922 | } |
| 923 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 924 | list_for_each_entry(gh2, &gl->gl_holders, gh_list) { |
| 925 | if (unlikely(gh2->gh_owner_pid == gh->gh_owner_pid && |
| 926 | (gh->gh_gl->gl_ops->go_type != LM_TYPE_FLOCK))) |
| 927 | goto trap_recursive; |
| 928 | if (try_lock && |
| 929 | !(gh2->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) && |
| 930 | !may_grant(gl, gh)) { |
| 931 | fail: |
| 932 | gh->gh_error = GLR_TRYFAILED; |
| 933 | gfs2_holder_wake(gh); |
| 934 | return; |
| 935 | } |
| 936 | if (test_bit(HIF_HOLDER, &gh2->gh_iflags)) |
| 937 | continue; |
| 938 | if (unlikely((gh->gh_flags & LM_FLAG_PRIORITY) && !insert_pt)) |
| 939 | insert_pt = &gh2->gh_list; |
| 940 | } |
| 941 | if (likely(insert_pt == NULL)) { |
| 942 | list_add_tail(&gh->gh_list, &gl->gl_holders); |
| 943 | if (unlikely(gh->gh_flags & LM_FLAG_PRIORITY)) |
| 944 | goto do_cancel; |
| 945 | return; |
| 946 | } |
Steven Whitehouse | 6399777 | 2009-06-12 08:49:20 +0100 | [diff] [blame] | 947 | trace_gfs2_glock_queue(gh, 1); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 948 | list_add_tail(&gh->gh_list, insert_pt); |
| 949 | do_cancel: |
| 950 | gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list); |
| 951 | if (!(gh->gh_flags & LM_FLAG_PRIORITY)) { |
| 952 | spin_unlock(&gl->gl_spin); |
Steven Whitehouse | 048bca2 | 2008-05-23 14:46:04 +0100 | [diff] [blame] | 953 | if (sdp->sd_lockstruct.ls_ops->lm_cancel) |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 954 | sdp->sd_lockstruct.ls_ops->lm_cancel(gl); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 955 | spin_lock(&gl->gl_spin); |
| 956 | } |
| 957 | return; |
| 958 | |
| 959 | trap_recursive: |
| 960 | print_symbol(KERN_ERR "original: %s\n", gh2->gh_ip); |
| 961 | printk(KERN_ERR "pid: %d\n", pid_nr(gh2->gh_owner_pid)); |
| 962 | printk(KERN_ERR "lock type: %d req lock state : %d\n", |
| 963 | gh2->gh_gl->gl_name.ln_type, gh2->gh_state); |
| 964 | print_symbol(KERN_ERR "new: %s\n", gh->gh_ip); |
| 965 | printk(KERN_ERR "pid: %d\n", pid_nr(gh->gh_owner_pid)); |
| 966 | printk(KERN_ERR "lock type: %d req lock state : %d\n", |
| 967 | gh->gh_gl->gl_name.ln_type, gh->gh_state); |
| 968 | __dump_glock(NULL, gl); |
| 969 | BUG(); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 970 | } |
| 971 | |
| 972 | /** |
| 973 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) |
| 974 | * @gh: the holder structure |
| 975 | * |
| 976 | * if (gh->gh_flags & GL_ASYNC), this never returns an error |
| 977 | * |
| 978 | * Returns: 0, GLR_TRYFAILED, or errno on failure |
| 979 | */ |
| 980 | |
| 981 | int gfs2_glock_nq(struct gfs2_holder *gh) |
| 982 | { |
| 983 | struct gfs2_glock *gl = gh->gh_gl; |
| 984 | struct gfs2_sbd *sdp = gl->gl_sbd; |
| 985 | int error = 0; |
| 986 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 987 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 988 | return -EIO; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 989 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 990 | spin_lock(&gl->gl_spin); |
| 991 | add_to_queue(gh); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 992 | run_queue(gl, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 993 | spin_unlock(&gl->gl_spin); |
| 994 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 995 | if (!(gh->gh_flags & GL_ASYNC)) |
| 996 | error = gfs2_glock_wait(gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 997 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 998 | return error; |
| 999 | } |
| 1000 | |
| 1001 | /** |
| 1002 | * gfs2_glock_poll - poll to see if an async request has been completed |
| 1003 | * @gh: the holder |
| 1004 | * |
| 1005 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on |
| 1006 | */ |
| 1007 | |
| 1008 | int gfs2_glock_poll(struct gfs2_holder *gh) |
| 1009 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1010 | return test_bit(HIF_WAIT, &gh->gh_iflags) ? 0 : 1; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1011 | } |
| 1012 | |
| 1013 | /** |
| 1014 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) |
| 1015 | * @gh: the glock holder |
| 1016 | * |
| 1017 | */ |
| 1018 | |
| 1019 | void gfs2_glock_dq(struct gfs2_holder *gh) |
| 1020 | { |
| 1021 | struct gfs2_glock *gl = gh->gh_gl; |
Steven Whitehouse | 8fb4b53 | 2006-08-30 09:30:00 -0400 | [diff] [blame] | 1022 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 1023 | unsigned delay = 0; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1024 | int fast_path = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1025 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1026 | spin_lock(&gl->gl_spin); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1027 | if (gh->gh_flags & GL_NOCACHE) |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1028 | handle_callback(gl, LM_ST_UNLOCKED, 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1029 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1030 | list_del_init(&gh->gh_list); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1031 | if (find_first_holder(gl) == NULL) { |
Steven Whitehouse | 3042a2c | 2007-11-02 08:39:34 +0000 | [diff] [blame] | 1032 | if (glops->go_unlock) { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1033 | GLOCK_BUG_ON(gl, test_and_set_bit(GLF_LOCK, &gl->gl_flags)); |
Steven Whitehouse | 3042a2c | 2007-11-02 08:39:34 +0000 | [diff] [blame] | 1034 | spin_unlock(&gl->gl_spin); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1035 | glops->go_unlock(gh); |
Steven Whitehouse | 3042a2c | 2007-11-02 08:39:34 +0000 | [diff] [blame] | 1036 | spin_lock(&gl->gl_spin); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1037 | clear_bit(GLF_LOCK, &gl->gl_flags); |
Steven Whitehouse | 3042a2c | 2007-11-02 08:39:34 +0000 | [diff] [blame] | 1038 | } |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1039 | if (list_empty(&gl->gl_holders) && |
| 1040 | !test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && |
| 1041 | !test_bit(GLF_DEMOTE, &gl->gl_flags)) |
| 1042 | fast_path = 1; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1043 | } |
Steven Whitehouse | 6399777 | 2009-06-12 08:49:20 +0100 | [diff] [blame] | 1044 | trace_gfs2_glock_queue(gh, 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1045 | spin_unlock(&gl->gl_spin); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1046 | if (likely(fast_path)) |
| 1047 | return; |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 1048 | |
| 1049 | gfs2_glock_hold(gl); |
| 1050 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && |
| 1051 | !test_bit(GLF_DEMOTE, &gl->gl_flags)) |
| 1052 | delay = gl->gl_ops->go_min_hold_time; |
| 1053 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) |
| 1054 | gfs2_glock_put(gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1055 | } |
| 1056 | |
Abhijith Das | d93cfa9 | 2007-06-11 08:22:32 +0100 | [diff] [blame] | 1057 | void gfs2_glock_dq_wait(struct gfs2_holder *gh) |
| 1058 | { |
| 1059 | struct gfs2_glock *gl = gh->gh_gl; |
| 1060 | gfs2_glock_dq(gh); |
| 1061 | wait_on_demote(gl); |
| 1062 | } |
| 1063 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1064 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1065 | * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it |
| 1066 | * @gh: the holder structure |
| 1067 | * |
| 1068 | */ |
| 1069 | |
| 1070 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh) |
| 1071 | { |
| 1072 | gfs2_glock_dq(gh); |
| 1073 | gfs2_holder_uninit(gh); |
| 1074 | } |
| 1075 | |
| 1076 | /** |
| 1077 | * gfs2_glock_nq_num - acquire a glock based on lock number |
| 1078 | * @sdp: the filesystem |
| 1079 | * @number: the lock number |
| 1080 | * @glops: the glock operations for the type of glock |
| 1081 | * @state: the state to acquire the glock in |
| 1082 | * @flags: modifier flags for the aquisition |
| 1083 | * @gh: the struct gfs2_holder |
| 1084 | * |
| 1085 | * Returns: errno |
| 1086 | */ |
| 1087 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1088 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, |
Steven Whitehouse | 8fb4b53 | 2006-08-30 09:30:00 -0400 | [diff] [blame] | 1089 | const struct gfs2_glock_operations *glops, |
| 1090 | unsigned int state, int flags, struct gfs2_holder *gh) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1091 | { |
| 1092 | struct gfs2_glock *gl; |
| 1093 | int error; |
| 1094 | |
| 1095 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); |
| 1096 | if (!error) { |
| 1097 | error = gfs2_glock_nq_init(gl, state, flags, gh); |
| 1098 | gfs2_glock_put(gl); |
| 1099 | } |
| 1100 | |
| 1101 | return error; |
| 1102 | } |
| 1103 | |
| 1104 | /** |
| 1105 | * glock_compare - Compare two struct gfs2_glock structures for sorting |
| 1106 | * @arg_a: the first structure |
| 1107 | * @arg_b: the second structure |
| 1108 | * |
| 1109 | */ |
| 1110 | |
| 1111 | static int glock_compare(const void *arg_a, const void *arg_b) |
| 1112 | { |
Steven Whitehouse | a5e08a9 | 2006-09-09 17:07:05 -0400 | [diff] [blame] | 1113 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
| 1114 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; |
| 1115 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; |
| 1116 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1117 | |
| 1118 | if (a->ln_number > b->ln_number) |
Steven Whitehouse | a5e08a9 | 2006-09-09 17:07:05 -0400 | [diff] [blame] | 1119 | return 1; |
| 1120 | if (a->ln_number < b->ln_number) |
| 1121 | return -1; |
Steven Whitehouse | 1c0f487 | 2007-01-22 12:10:39 -0500 | [diff] [blame] | 1122 | BUG_ON(gh_a->gh_gl->gl_ops->go_type == gh_b->gh_gl->gl_ops->go_type); |
Steven Whitehouse | a5e08a9 | 2006-09-09 17:07:05 -0400 | [diff] [blame] | 1123 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1124 | } |
| 1125 | |
| 1126 | /** |
| 1127 | * nq_m_sync - synchonously acquire more than one glock in deadlock free order |
| 1128 | * @num_gh: the number of structures |
| 1129 | * @ghs: an array of struct gfs2_holder structures |
| 1130 | * |
| 1131 | * Returns: 0 on success (all glocks acquired), |
| 1132 | * errno on failure (no glocks acquired) |
| 1133 | */ |
| 1134 | |
| 1135 | static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs, |
| 1136 | struct gfs2_holder **p) |
| 1137 | { |
| 1138 | unsigned int x; |
| 1139 | int error = 0; |
| 1140 | |
| 1141 | for (x = 0; x < num_gh; x++) |
| 1142 | p[x] = &ghs[x]; |
| 1143 | |
| 1144 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL); |
| 1145 | |
| 1146 | for (x = 0; x < num_gh; x++) { |
| 1147 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); |
| 1148 | |
| 1149 | error = gfs2_glock_nq(p[x]); |
| 1150 | if (error) { |
| 1151 | while (x--) |
| 1152 | gfs2_glock_dq(p[x]); |
| 1153 | break; |
| 1154 | } |
| 1155 | } |
| 1156 | |
| 1157 | return error; |
| 1158 | } |
| 1159 | |
| 1160 | /** |
| 1161 | * gfs2_glock_nq_m - acquire multiple glocks |
| 1162 | * @num_gh: the number of structures |
| 1163 | * @ghs: an array of struct gfs2_holder structures |
| 1164 | * |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1165 | * |
| 1166 | * Returns: 0 on success (all glocks acquired), |
| 1167 | * errno on failure (no glocks acquired) |
| 1168 | */ |
| 1169 | |
| 1170 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) |
| 1171 | { |
Steven Whitehouse | eaf5bd3 | 2007-06-19 15:38:17 +0100 | [diff] [blame] | 1172 | struct gfs2_holder *tmp[4]; |
| 1173 | struct gfs2_holder **pph = tmp; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1174 | int error = 0; |
| 1175 | |
Steven Whitehouse | eaf5bd3 | 2007-06-19 15:38:17 +0100 | [diff] [blame] | 1176 | switch(num_gh) { |
| 1177 | case 0: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1178 | return 0; |
Steven Whitehouse | eaf5bd3 | 2007-06-19 15:38:17 +0100 | [diff] [blame] | 1179 | case 1: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1180 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); |
| 1181 | return gfs2_glock_nq(ghs); |
Steven Whitehouse | eaf5bd3 | 2007-06-19 15:38:17 +0100 | [diff] [blame] | 1182 | default: |
| 1183 | if (num_gh <= 4) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1184 | break; |
Steven Whitehouse | eaf5bd3 | 2007-06-19 15:38:17 +0100 | [diff] [blame] | 1185 | pph = kmalloc(num_gh * sizeof(struct gfs2_holder *), GFP_NOFS); |
| 1186 | if (!pph) |
| 1187 | return -ENOMEM; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1188 | } |
| 1189 | |
Steven Whitehouse | eaf5bd3 | 2007-06-19 15:38:17 +0100 | [diff] [blame] | 1190 | error = nq_m_sync(num_gh, ghs, pph); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1191 | |
Steven Whitehouse | eaf5bd3 | 2007-06-19 15:38:17 +0100 | [diff] [blame] | 1192 | if (pph != tmp) |
| 1193 | kfree(pph); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1194 | |
| 1195 | return error; |
| 1196 | } |
| 1197 | |
| 1198 | /** |
| 1199 | * gfs2_glock_dq_m - release multiple glocks |
| 1200 | * @num_gh: the number of structures |
| 1201 | * @ghs: an array of struct gfs2_holder structures |
| 1202 | * |
| 1203 | */ |
| 1204 | |
| 1205 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) |
| 1206 | { |
| 1207 | unsigned int x; |
| 1208 | |
| 1209 | for (x = 0; x < num_gh; x++) |
| 1210 | gfs2_glock_dq(&ghs[x]); |
| 1211 | } |
| 1212 | |
| 1213 | /** |
| 1214 | * gfs2_glock_dq_uninit_m - release multiple glocks |
| 1215 | * @num_gh: the number of structures |
| 1216 | * @ghs: an array of struct gfs2_holder structures |
| 1217 | * |
| 1218 | */ |
| 1219 | |
| 1220 | void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs) |
| 1221 | { |
| 1222 | unsigned int x; |
| 1223 | |
| 1224 | for (x = 0; x < num_gh; x++) |
| 1225 | gfs2_glock_dq_uninit(&ghs[x]); |
| 1226 | } |
| 1227 | |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1228 | void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state) |
Steven Whitehouse | da755fd | 2008-01-30 15:34:04 +0000 | [diff] [blame] | 1229 | { |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 1230 | unsigned long delay = 0; |
| 1231 | unsigned long holdtime; |
| 1232 | unsigned long now = jiffies; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1233 | |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1234 | gfs2_glock_hold(gl); |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 1235 | holdtime = gl->gl_tchange + gl->gl_ops->go_min_hold_time; |
| 1236 | if (time_before(now, holdtime)) |
| 1237 | delay = holdtime - now; |
Steven Whitehouse | dff5257 | 2008-09-02 13:33:17 +0100 | [diff] [blame] | 1238 | if (test_bit(GLF_REPLY_PENDING, &gl->gl_flags)) |
| 1239 | delay = gl->gl_ops->go_min_hold_time; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1240 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1241 | spin_lock(&gl->gl_spin); |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1242 | handle_callback(gl, state, delay); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1243 | spin_unlock(&gl->gl_spin); |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 1244 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) |
| 1245 | gfs2_glock_put(gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1246 | } |
| 1247 | |
| 1248 | /** |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1249 | * gfs2_glock_complete - Callback used by locking |
| 1250 | * @gl: Pointer to the glock |
| 1251 | * @ret: The return value from the dlm |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1252 | * |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1253 | */ |
| 1254 | |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1255 | void gfs2_glock_complete(struct gfs2_glock *gl, int ret) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1256 | { |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1257 | struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct; |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1258 | gl->gl_reply = ret; |
| 1259 | if (unlikely(test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags))) { |
| 1260 | struct gfs2_holder *gh; |
| 1261 | spin_lock(&gl->gl_spin); |
| 1262 | gh = find_first_waiter(gl); |
| 1263 | if ((!(gh && (gh->gh_flags & LM_FLAG_NOEXP)) && |
| 1264 | (gl->gl_target != LM_ST_UNLOCKED)) || |
| 1265 | ((ret & ~LM_OUT_ST_MASK) != 0)) |
| 1266 | set_bit(GLF_FROZEN, &gl->gl_flags); |
| 1267 | spin_unlock(&gl->gl_spin); |
Steven Whitehouse | d8348de | 2009-02-05 10:12:38 +0000 | [diff] [blame] | 1268 | if (test_bit(GLF_FROZEN, &gl->gl_flags)) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1269 | return; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1270 | } |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1271 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
| 1272 | gfs2_glock_hold(gl); |
| 1273 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
| 1274 | gfs2_glock_put(gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1275 | } |
| 1276 | |
| 1277 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1278 | * demote_ok - Check to see if it's ok to unlock a glock |
| 1279 | * @gl: the glock |
| 1280 | * |
| 1281 | * Returns: 1 if it's ok |
| 1282 | */ |
| 1283 | |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1284 | static int demote_ok(const struct gfs2_glock *gl) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1285 | { |
Steven Whitehouse | 8fb4b53 | 2006-08-30 09:30:00 -0400 | [diff] [blame] | 1286 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1287 | |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1288 | if (gl->gl_state == LM_ST_UNLOCKED) |
| 1289 | return 0; |
| 1290 | if (!list_empty(&gl->gl_holders)) |
| 1291 | return 0; |
| 1292 | if (glops->go_demote_ok) |
| 1293 | return glops->go_demote_ok(gl); |
| 1294 | return 1; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1295 | } |
| 1296 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1297 | |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1298 | static int gfs2_shrink_glock_memory(int nr, gfp_t gfp_mask) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1299 | { |
| 1300 | struct gfs2_glock *gl; |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1301 | int may_demote; |
| 1302 | int nr_skipped = 0; |
| 1303 | int got_ref = 0; |
| 1304 | LIST_HEAD(skipped); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1305 | |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1306 | if (nr == 0) |
| 1307 | goto out; |
| 1308 | |
| 1309 | if (!(gfp_mask & __GFP_FS)) |
| 1310 | return -1; |
| 1311 | |
| 1312 | spin_lock(&lru_lock); |
| 1313 | while(nr && !list_empty(&lru_list)) { |
| 1314 | gl = list_entry(lru_list.next, struct gfs2_glock, gl_lru); |
| 1315 | list_del_init(&gl->gl_lru); |
| 1316 | atomic_dec(&lru_count); |
| 1317 | |
| 1318 | /* Test for being demotable */ |
| 1319 | if (!test_and_set_bit(GLF_LOCK, &gl->gl_flags)) { |
| 1320 | gfs2_glock_hold(gl); |
| 1321 | got_ref = 1; |
| 1322 | spin_unlock(&lru_lock); |
| 1323 | spin_lock(&gl->gl_spin); |
| 1324 | may_demote = demote_ok(gl); |
| 1325 | spin_unlock(&gl->gl_spin); |
| 1326 | clear_bit(GLF_LOCK, &gl->gl_flags); |
| 1327 | if (may_demote) { |
| 1328 | handle_callback(gl, LM_ST_UNLOCKED, 0); |
| 1329 | nr--; |
| 1330 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
| 1331 | gfs2_glock_put(gl); |
Steven Whitehouse | 0c7a531 | 2009-04-30 14:52:58 +0100 | [diff] [blame] | 1332 | got_ref = 0; |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1333 | } |
| 1334 | spin_lock(&lru_lock); |
| 1335 | if (may_demote) |
| 1336 | continue; |
| 1337 | } |
| 1338 | if (list_empty(&gl->gl_lru) && |
| 1339 | (atomic_read(&gl->gl_ref) <= (2 + got_ref))) { |
| 1340 | nr_skipped++; |
| 1341 | list_add(&gl->gl_lru, &skipped); |
| 1342 | } |
| 1343 | if (got_ref) { |
| 1344 | spin_unlock(&lru_lock); |
| 1345 | gfs2_glock_put(gl); |
| 1346 | spin_lock(&lru_lock); |
| 1347 | got_ref = 0; |
| 1348 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1349 | } |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1350 | list_splice(&skipped, &lru_list); |
| 1351 | atomic_add(nr_skipped, &lru_count); |
| 1352 | spin_unlock(&lru_lock); |
| 1353 | out: |
| 1354 | return (atomic_read(&lru_count) / 100) * sysctl_vfs_cache_pressure; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1355 | } |
| 1356 | |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1357 | static struct shrinker glock_shrinker = { |
| 1358 | .shrink = gfs2_shrink_glock_memory, |
| 1359 | .seeks = DEFAULT_SEEKS, |
| 1360 | }; |
| 1361 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1362 | /** |
| 1363 | * examine_bucket - Call a function for glock in a hash bucket |
| 1364 | * @examiner: the function |
| 1365 | * @sdp: the filesystem |
| 1366 | * @bucket: the bucket |
| 1367 | * |
| 1368 | * Returns: 1 if the bucket has entries |
| 1369 | */ |
| 1370 | |
| 1371 | static int examine_bucket(glock_examiner examiner, struct gfs2_sbd *sdp, |
Steven Whitehouse | 37b2fa6 | 2006-09-08 13:35:56 -0400 | [diff] [blame] | 1372 | unsigned int hash) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1373 | { |
Steven Whitehouse | 2426443 | 2006-09-11 21:40:30 -0400 | [diff] [blame] | 1374 | struct gfs2_glock *gl, *prev = NULL; |
| 1375 | int has_entries = 0; |
Steven Whitehouse | b639789 | 2006-09-12 10:10:01 -0400 | [diff] [blame] | 1376 | struct hlist_head *head = &gl_hash_table[hash].hb_list; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1377 | |
Steven Whitehouse | 2426443 | 2006-09-11 21:40:30 -0400 | [diff] [blame] | 1378 | read_lock(gl_lock_addr(hash)); |
Steven Whitehouse | b639789 | 2006-09-12 10:10:01 -0400 | [diff] [blame] | 1379 | /* Can't use hlist_for_each_entry - don't want prefetch here */ |
| 1380 | if (hlist_empty(head)) |
Steven Whitehouse | 2426443 | 2006-09-11 21:40:30 -0400 | [diff] [blame] | 1381 | goto out; |
Steven Whitehouse | b639789 | 2006-09-12 10:10:01 -0400 | [diff] [blame] | 1382 | gl = list_entry(head->first, struct gfs2_glock, gl_list); |
| 1383 | while(1) { |
Steven Whitehouse | 8fbbfd2 | 2007-08-01 13:57:10 +0100 | [diff] [blame] | 1384 | if (!sdp || gl->gl_sbd == sdp) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1385 | gfs2_glock_hold(gl); |
Steven Whitehouse | 2426443 | 2006-09-11 21:40:30 -0400 | [diff] [blame] | 1386 | read_unlock(gl_lock_addr(hash)); |
| 1387 | if (prev) |
| 1388 | gfs2_glock_put(prev); |
| 1389 | prev = gl; |
| 1390 | examiner(gl); |
Steven Whitehouse | a833634 | 2006-09-14 13:57:38 -0400 | [diff] [blame] | 1391 | has_entries = 1; |
Steven Whitehouse | 2426443 | 2006-09-11 21:40:30 -0400 | [diff] [blame] | 1392 | read_lock(gl_lock_addr(hash)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1393 | } |
Steven Whitehouse | b639789 | 2006-09-12 10:10:01 -0400 | [diff] [blame] | 1394 | if (gl->gl_list.next == NULL) |
| 1395 | break; |
Steven Whitehouse | 2426443 | 2006-09-11 21:40:30 -0400 | [diff] [blame] | 1396 | gl = list_entry(gl->gl_list.next, struct gfs2_glock, gl_list); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1397 | } |
Steven Whitehouse | 2426443 | 2006-09-11 21:40:30 -0400 | [diff] [blame] | 1398 | out: |
| 1399 | read_unlock(gl_lock_addr(hash)); |
| 1400 | if (prev) |
| 1401 | gfs2_glock_put(prev); |
Steven Whitehouse | 8fbbfd2 | 2007-08-01 13:57:10 +0100 | [diff] [blame] | 1402 | cond_resched(); |
Steven Whitehouse | 2426443 | 2006-09-11 21:40:30 -0400 | [diff] [blame] | 1403 | return has_entries; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1404 | } |
| 1405 | |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1406 | |
| 1407 | /** |
| 1408 | * thaw_glock - thaw out a glock which has an unprocessed reply waiting |
| 1409 | * @gl: The glock to thaw |
| 1410 | * |
| 1411 | * N.B. When we freeze a glock, we leave a ref to the glock outstanding, |
| 1412 | * so this has to result in the ref count being dropped by one. |
| 1413 | */ |
| 1414 | |
| 1415 | static void thaw_glock(struct gfs2_glock *gl) |
| 1416 | { |
| 1417 | if (!test_and_clear_bit(GLF_FROZEN, &gl->gl_flags)) |
| 1418 | return; |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1419 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
| 1420 | gfs2_glock_hold(gl); |
| 1421 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
| 1422 | gfs2_glock_put(gl); |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1423 | } |
| 1424 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1425 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1426 | * clear_glock - look at a glock and see if we can free it from glock cache |
| 1427 | * @gl: the glock to look at |
| 1428 | * |
| 1429 | */ |
| 1430 | |
| 1431 | static void clear_glock(struct gfs2_glock *gl) |
| 1432 | { |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1433 | spin_lock(&lru_lock); |
| 1434 | if (!list_empty(&gl->gl_lru)) { |
| 1435 | list_del_init(&gl->gl_lru); |
| 1436 | atomic_dec(&lru_count); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1437 | } |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1438 | spin_unlock(&lru_lock); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1439 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1440 | spin_lock(&gl->gl_spin); |
| 1441 | if (find_first_holder(gl) == NULL && gl->gl_state != LM_ST_UNLOCKED) |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1442 | handle_callback(gl, LM_ST_UNLOCKED, 0); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1443 | spin_unlock(&gl->gl_spin); |
| 1444 | gfs2_glock_hold(gl); |
| 1445 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
| 1446 | gfs2_glock_put(gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1447 | } |
| 1448 | |
| 1449 | /** |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1450 | * gfs2_glock_thaw - Thaw any frozen glocks |
| 1451 | * @sdp: The super block |
| 1452 | * |
| 1453 | */ |
| 1454 | |
| 1455 | void gfs2_glock_thaw(struct gfs2_sbd *sdp) |
| 1456 | { |
| 1457 | unsigned x; |
| 1458 | |
| 1459 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) |
| 1460 | examine_bucket(thaw_glock, sdp, x); |
| 1461 | } |
| 1462 | |
| 1463 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1464 | * gfs2_gl_hash_clear - Empty out the glock hash table |
| 1465 | * @sdp: the filesystem |
| 1466 | * @wait: wait until it's all gone |
| 1467 | * |
Steven Whitehouse | 1bdad60 | 2008-06-03 14:09:53 +0100 | [diff] [blame] | 1468 | * Called when unmounting the filesystem. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1469 | */ |
| 1470 | |
Steven Whitehouse | fefc03b | 2008-12-19 15:32:06 +0000 | [diff] [blame] | 1471 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1472 | { |
| 1473 | unsigned long t; |
| 1474 | unsigned int x; |
| 1475 | int cont; |
| 1476 | |
| 1477 | t = jiffies; |
| 1478 | |
| 1479 | for (;;) { |
| 1480 | cont = 0; |
Steven Whitehouse | 2426443 | 2006-09-11 21:40:30 -0400 | [diff] [blame] | 1481 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) { |
Steven Whitehouse | 907b9bc | 2006-09-25 09:26:04 -0400 | [diff] [blame] | 1482 | if (examine_bucket(clear_glock, sdp, x)) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1483 | cont = 1; |
Steven Whitehouse | 2426443 | 2006-09-11 21:40:30 -0400 | [diff] [blame] | 1484 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1485 | |
Steven Whitehouse | 1bdad60 | 2008-06-03 14:09:53 +0100 | [diff] [blame] | 1486 | if (!cont) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1487 | break; |
| 1488 | |
| 1489 | if (time_after_eq(jiffies, |
| 1490 | t + gfs2_tune_get(sdp, gt_stall_secs) * HZ)) { |
| 1491 | fs_warn(sdp, "Unmount seems to be stalled. " |
| 1492 | "Dumping lock state...\n"); |
| 1493 | gfs2_dump_lockstate(sdp); |
| 1494 | t = jiffies; |
| 1495 | } |
| 1496 | |
Steven Whitehouse | 61be084 | 2007-01-29 11:51:45 +0000 | [diff] [blame] | 1497 | down_write(&gfs2_umount_flush_sem); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1498 | invalidate_inodes(sdp->sd_vfs); |
Steven Whitehouse | 61be084 | 2007-01-29 11:51:45 +0000 | [diff] [blame] | 1499 | up_write(&gfs2_umount_flush_sem); |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 1500 | msleep(10); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1501 | } |
| 1502 | } |
| 1503 | |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 1504 | void gfs2_glock_finish_truncate(struct gfs2_inode *ip) |
| 1505 | { |
| 1506 | struct gfs2_glock *gl = ip->i_gl; |
| 1507 | int ret; |
| 1508 | |
| 1509 | ret = gfs2_truncatei_resume(ip); |
| 1510 | gfs2_assert_withdraw(gl->gl_sbd, ret == 0); |
| 1511 | |
| 1512 | spin_lock(&gl->gl_spin); |
| 1513 | clear_bit(GLF_LOCK, &gl->gl_flags); |
| 1514 | run_queue(gl, 1); |
| 1515 | spin_unlock(&gl->gl_spin); |
| 1516 | } |
| 1517 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1518 | static const char *state2str(unsigned state) |
Robert Peterson | 04b933f | 2007-03-23 17:05:15 -0500 | [diff] [blame] | 1519 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1520 | switch(state) { |
| 1521 | case LM_ST_UNLOCKED: |
| 1522 | return "UN"; |
| 1523 | case LM_ST_SHARED: |
| 1524 | return "SH"; |
| 1525 | case LM_ST_DEFERRED: |
| 1526 | return "DF"; |
| 1527 | case LM_ST_EXCLUSIVE: |
| 1528 | return "EX"; |
| 1529 | } |
| 1530 | return "??"; |
| 1531 | } |
Robert Peterson | 04b933f | 2007-03-23 17:05:15 -0500 | [diff] [blame] | 1532 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1533 | static const char *hflags2str(char *buf, unsigned flags, unsigned long iflags) |
| 1534 | { |
| 1535 | char *p = buf; |
| 1536 | if (flags & LM_FLAG_TRY) |
| 1537 | *p++ = 't'; |
| 1538 | if (flags & LM_FLAG_TRY_1CB) |
| 1539 | *p++ = 'T'; |
| 1540 | if (flags & LM_FLAG_NOEXP) |
| 1541 | *p++ = 'e'; |
| 1542 | if (flags & LM_FLAG_ANY) |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1543 | *p++ = 'A'; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1544 | if (flags & LM_FLAG_PRIORITY) |
| 1545 | *p++ = 'p'; |
| 1546 | if (flags & GL_ASYNC) |
| 1547 | *p++ = 'a'; |
| 1548 | if (flags & GL_EXACT) |
| 1549 | *p++ = 'E'; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1550 | if (flags & GL_NOCACHE) |
| 1551 | *p++ = 'c'; |
| 1552 | if (test_bit(HIF_HOLDER, &iflags)) |
| 1553 | *p++ = 'H'; |
| 1554 | if (test_bit(HIF_WAIT, &iflags)) |
| 1555 | *p++ = 'W'; |
| 1556 | if (test_bit(HIF_FIRST, &iflags)) |
| 1557 | *p++ = 'F'; |
| 1558 | *p = 0; |
| 1559 | return buf; |
Robert Peterson | 04b933f | 2007-03-23 17:05:15 -0500 | [diff] [blame] | 1560 | } |
| 1561 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1562 | /** |
| 1563 | * dump_holder - print information about a glock holder |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1564 | * @seq: the seq_file struct |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1565 | * @gh: the glock holder |
| 1566 | * |
| 1567 | * Returns: 0 on success, -ENOBUFS when we run out of space |
| 1568 | */ |
| 1569 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1570 | static int dump_holder(struct seq_file *seq, const struct gfs2_holder *gh) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1571 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1572 | struct task_struct *gh_owner = NULL; |
| 1573 | char buffer[KSYM_SYMBOL_LEN]; |
| 1574 | char flags_buf[32]; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1575 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1576 | sprint_symbol(buffer, gh->gh_ip); |
| 1577 | if (gh->gh_owner_pid) |
Pavel Emelyanov | b1e058d | 2008-02-07 00:13:19 -0800 | [diff] [blame] | 1578 | gh_owner = pid_task(gh->gh_owner_pid, PIDTYPE_PID); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1579 | gfs2_print_dbg(seq, " H: s:%s f:%s e:%d p:%ld [%s] %s\n", |
| 1580 | state2str(gh->gh_state), |
| 1581 | hflags2str(flags_buf, gh->gh_flags, gh->gh_iflags), |
| 1582 | gh->gh_error, |
| 1583 | gh->gh_owner_pid ? (long)pid_nr(gh->gh_owner_pid) : -1, |
| 1584 | gh_owner ? gh_owner->comm : "(ended)", buffer); |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1585 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1586 | } |
| 1587 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1588 | static const char *gflags2str(char *buf, const unsigned long *gflags) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1589 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1590 | char *p = buf; |
| 1591 | if (test_bit(GLF_LOCK, gflags)) |
| 1592 | *p++ = 'l'; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1593 | if (test_bit(GLF_DEMOTE, gflags)) |
| 1594 | *p++ = 'D'; |
| 1595 | if (test_bit(GLF_PENDING_DEMOTE, gflags)) |
| 1596 | *p++ = 'd'; |
| 1597 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, gflags)) |
| 1598 | *p++ = 'p'; |
| 1599 | if (test_bit(GLF_DIRTY, gflags)) |
| 1600 | *p++ = 'y'; |
| 1601 | if (test_bit(GLF_LFLUSH, gflags)) |
| 1602 | *p++ = 'f'; |
| 1603 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, gflags)) |
| 1604 | *p++ = 'i'; |
| 1605 | if (test_bit(GLF_REPLY_PENDING, gflags)) |
| 1606 | *p++ = 'r'; |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1607 | if (test_bit(GLF_INITIAL, gflags)) |
Steven Whitehouse | d8348de | 2009-02-05 10:12:38 +0000 | [diff] [blame] | 1608 | *p++ = 'I'; |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1609 | if (test_bit(GLF_FROZEN, gflags)) |
| 1610 | *p++ = 'F'; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1611 | *p = 0; |
| 1612 | return buf; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1613 | } |
| 1614 | |
| 1615 | /** |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1616 | * __dump_glock - print information about a glock |
| 1617 | * @seq: The seq_file struct |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1618 | * @gl: the glock |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1619 | * |
| 1620 | * The file format is as follows: |
| 1621 | * One line per object, capital letters are used to indicate objects |
| 1622 | * G = glock, I = Inode, R = rgrp, H = holder. Glocks are not indented, |
| 1623 | * other objects are indented by a single space and follow the glock to |
| 1624 | * which they are related. Fields are indicated by lower case letters |
| 1625 | * followed by a colon and the field value, except for strings which are in |
| 1626 | * [] so that its possible to see if they are composed of spaces for |
| 1627 | * example. The field's are n = number (id of the object), f = flags, |
| 1628 | * t = type, s = state, r = refcount, e = error, p = pid. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1629 | * |
| 1630 | * Returns: 0 on success, -ENOBUFS when we run out of space |
| 1631 | */ |
| 1632 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1633 | static int __dump_glock(struct seq_file *seq, const struct gfs2_glock *gl) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1634 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1635 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
| 1636 | unsigned long long dtime; |
| 1637 | const struct gfs2_holder *gh; |
| 1638 | char gflags_buf[32]; |
| 1639 | int error = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1640 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1641 | dtime = jiffies - gl->gl_demote_time; |
| 1642 | dtime *= 1000000/HZ; /* demote time in uSec */ |
| 1643 | if (!test_bit(GLF_DEMOTE, &gl->gl_flags)) |
| 1644 | dtime = 0; |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1645 | gfs2_print_dbg(seq, "G: s:%s n:%u/%llu f:%s t:%s d:%s/%llu a:%d r:%d\n", |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1646 | state2str(gl->gl_state), |
| 1647 | gl->gl_name.ln_type, |
| 1648 | (unsigned long long)gl->gl_name.ln_number, |
| 1649 | gflags2str(gflags_buf, &gl->gl_flags), |
| 1650 | state2str(gl->gl_target), |
| 1651 | state2str(gl->gl_demote_state), dtime, |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1652 | atomic_read(&gl->gl_ail_count), |
| 1653 | atomic_read(&gl->gl_ref)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1654 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1655 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1656 | error = dump_holder(seq, gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1657 | if (error) |
| 1658 | goto out; |
| 1659 | } |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1660 | if (gl->gl_state != LM_ST_UNLOCKED && glops->go_dump) |
| 1661 | error = glops->go_dump(seq, gl); |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 1662 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1663 | return error; |
| 1664 | } |
| 1665 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1666 | static int dump_glock(struct seq_file *seq, struct gfs2_glock *gl) |
| 1667 | { |
| 1668 | int ret; |
| 1669 | spin_lock(&gl->gl_spin); |
| 1670 | ret = __dump_glock(seq, gl); |
| 1671 | spin_unlock(&gl->gl_spin); |
| 1672 | return ret; |
| 1673 | } |
| 1674 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1675 | /** |
| 1676 | * gfs2_dump_lockstate - print out the current lockstate |
| 1677 | * @sdp: the filesystem |
| 1678 | * @ub: the buffer to copy the information into |
| 1679 | * |
| 1680 | * If @ub is NULL, dump the lockstate to the console. |
| 1681 | * |
| 1682 | */ |
| 1683 | |
Adrian Bunk | 08bc2db | 2006-04-28 10:59:12 -0400 | [diff] [blame] | 1684 | static int gfs2_dump_lockstate(struct gfs2_sbd *sdp) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1685 | { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1686 | struct gfs2_glock *gl; |
Steven Whitehouse | b639789 | 2006-09-12 10:10:01 -0400 | [diff] [blame] | 1687 | struct hlist_node *h; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1688 | unsigned int x; |
| 1689 | int error = 0; |
| 1690 | |
| 1691 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1692 | |
Steven Whitehouse | 087efdd | 2006-09-09 16:59:11 -0400 | [diff] [blame] | 1693 | read_lock(gl_lock_addr(x)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1694 | |
Steven Whitehouse | b639789 | 2006-09-12 10:10:01 -0400 | [diff] [blame] | 1695 | hlist_for_each_entry(gl, h, &gl_hash_table[x].hb_list, gl_list) { |
Steven Whitehouse | 85d1da6 | 2006-09-07 14:40:21 -0400 | [diff] [blame] | 1696 | if (gl->gl_sbd != sdp) |
| 1697 | continue; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1698 | |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1699 | error = dump_glock(NULL, gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1700 | if (error) |
| 1701 | break; |
| 1702 | } |
| 1703 | |
Steven Whitehouse | 087efdd | 2006-09-09 16:59:11 -0400 | [diff] [blame] | 1704 | read_unlock(gl_lock_addr(x)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1705 | |
| 1706 | if (error) |
| 1707 | break; |
| 1708 | } |
| 1709 | |
| 1710 | |
| 1711 | return error; |
| 1712 | } |
| 1713 | |
Steven Whitehouse | 8fbbfd2 | 2007-08-01 13:57:10 +0100 | [diff] [blame] | 1714 | |
Steven Whitehouse | 85d1da6 | 2006-09-07 14:40:21 -0400 | [diff] [blame] | 1715 | int __init gfs2_glock_init(void) |
| 1716 | { |
| 1717 | unsigned i; |
| 1718 | for(i = 0; i < GFS2_GL_HASH_SIZE; i++) { |
Steven Whitehouse | b639789 | 2006-09-12 10:10:01 -0400 | [diff] [blame] | 1719 | INIT_HLIST_HEAD(&gl_hash_table[i].hb_list); |
Steven Whitehouse | 85d1da6 | 2006-09-07 14:40:21 -0400 | [diff] [blame] | 1720 | } |
Steven Whitehouse | 087efdd | 2006-09-09 16:59:11 -0400 | [diff] [blame] | 1721 | #ifdef GL_HASH_LOCK_SZ |
| 1722 | for(i = 0; i < GL_HASH_LOCK_SZ; i++) { |
| 1723 | rwlock_init(&gl_hash_locks[i]); |
| 1724 | } |
| 1725 | #endif |
Steven Whitehouse | 8fbbfd2 | 2007-08-01 13:57:10 +0100 | [diff] [blame] | 1726 | |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 1727 | glock_workqueue = create_workqueue("glock_workqueue"); |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1728 | if (IS_ERR(glock_workqueue)) |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 1729 | return PTR_ERR(glock_workqueue); |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1730 | |
| 1731 | register_shrinker(&glock_shrinker); |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 1732 | |
Steven Whitehouse | 85d1da6 | 2006-09-07 14:40:21 -0400 | [diff] [blame] | 1733 | return 0; |
| 1734 | } |
| 1735 | |
Steven Whitehouse | 8fbbfd2 | 2007-08-01 13:57:10 +0100 | [diff] [blame] | 1736 | void gfs2_glock_exit(void) |
| 1737 | { |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1738 | unregister_shrinker(&glock_shrinker); |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 1739 | destroy_workqueue(glock_workqueue); |
Steven Whitehouse | 8fbbfd2 | 2007-08-01 13:57:10 +0100 | [diff] [blame] | 1740 | } |
| 1741 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1742 | static int gfs2_glock_iter_next(struct gfs2_glock_iter *gi) |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1743 | { |
Steven Whitehouse | 7b08fc6 | 2007-07-24 13:53:36 +0100 | [diff] [blame] | 1744 | struct gfs2_glock *gl; |
| 1745 | |
Abhijith Das | a947e03 | 2007-08-21 09:57:29 -0500 | [diff] [blame] | 1746 | restart: |
Robert Peterson | 7a0079d | 2007-04-17 11:37:11 -0500 | [diff] [blame] | 1747 | read_lock(gl_lock_addr(gi->hash)); |
Steven Whitehouse | 7b08fc6 | 2007-07-24 13:53:36 +0100 | [diff] [blame] | 1748 | gl = gi->gl; |
| 1749 | if (gl) { |
Abhijith Das | a947e03 | 2007-08-21 09:57:29 -0500 | [diff] [blame] | 1750 | gi->gl = hlist_entry(gl->gl_list.next, |
| 1751 | struct gfs2_glock, gl_list); |
Steven Whitehouse | c1e817d | 2008-07-22 22:58:03 +0100 | [diff] [blame] | 1752 | } else { |
| 1753 | gi->gl = hlist_entry(gl_hash_table[gi->hash].hb_list.first, |
| 1754 | struct gfs2_glock, gl_list); |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1755 | } |
Steven Whitehouse | c1e817d | 2008-07-22 22:58:03 +0100 | [diff] [blame] | 1756 | if (gi->gl) |
| 1757 | gfs2_glock_hold(gi->gl); |
Robert Peterson | 7a0079d | 2007-04-17 11:37:11 -0500 | [diff] [blame] | 1758 | read_unlock(gl_lock_addr(gi->hash)); |
Steven Whitehouse | 7b08fc6 | 2007-07-24 13:53:36 +0100 | [diff] [blame] | 1759 | if (gl) |
| 1760 | gfs2_glock_put(gl); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1761 | while (gi->gl == NULL) { |
Steven Whitehouse | c1e817d | 2008-07-22 22:58:03 +0100 | [diff] [blame] | 1762 | gi->hash++; |
Steven Whitehouse | 7b08fc6 | 2007-07-24 13:53:36 +0100 | [diff] [blame] | 1763 | if (gi->hash >= GFS2_GL_HASH_SIZE) |
| 1764 | return 1; |
| 1765 | read_lock(gl_lock_addr(gi->hash)); |
| 1766 | gi->gl = hlist_entry(gl_hash_table[gi->hash].hb_list.first, |
| 1767 | struct gfs2_glock, gl_list); |
| 1768 | if (gi->gl) |
| 1769 | gfs2_glock_hold(gi->gl); |
| 1770 | read_unlock(gl_lock_addr(gi->hash)); |
| 1771 | } |
Abhijith Das | a947e03 | 2007-08-21 09:57:29 -0500 | [diff] [blame] | 1772 | |
| 1773 | if (gi->sdp != gi->gl->gl_sbd) |
| 1774 | goto restart; |
| 1775 | |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1776 | return 0; |
| 1777 | } |
| 1778 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1779 | static void gfs2_glock_iter_free(struct gfs2_glock_iter *gi) |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1780 | { |
Steven Whitehouse | 7b08fc6 | 2007-07-24 13:53:36 +0100 | [diff] [blame] | 1781 | if (gi->gl) |
| 1782 | gfs2_glock_put(gi->gl); |
Abhijith Das | a947e03 | 2007-08-21 09:57:29 -0500 | [diff] [blame] | 1783 | gi->gl = NULL; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1784 | } |
| 1785 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1786 | static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos) |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1787 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1788 | struct gfs2_glock_iter *gi = seq->private; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1789 | loff_t n = *pos; |
| 1790 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1791 | gi->hash = 0; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1792 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1793 | do { |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1794 | if (gfs2_glock_iter_next(gi)) { |
| 1795 | gfs2_glock_iter_free(gi); |
| 1796 | return NULL; |
| 1797 | } |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1798 | } while (n--); |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1799 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1800 | return gi->gl; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1801 | } |
| 1802 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1803 | static void *gfs2_glock_seq_next(struct seq_file *seq, void *iter_ptr, |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1804 | loff_t *pos) |
| 1805 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1806 | struct gfs2_glock_iter *gi = seq->private; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1807 | |
| 1808 | (*pos)++; |
| 1809 | |
| 1810 | if (gfs2_glock_iter_next(gi)) { |
| 1811 | gfs2_glock_iter_free(gi); |
| 1812 | return NULL; |
| 1813 | } |
| 1814 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1815 | return gi->gl; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1816 | } |
| 1817 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1818 | static void gfs2_glock_seq_stop(struct seq_file *seq, void *iter_ptr) |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1819 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1820 | struct gfs2_glock_iter *gi = seq->private; |
| 1821 | gfs2_glock_iter_free(gi); |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1822 | } |
| 1823 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1824 | static int gfs2_glock_seq_show(struct seq_file *seq, void *iter_ptr) |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1825 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1826 | return dump_glock(seq, iter_ptr); |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1827 | } |
| 1828 | |
Denis Cheng | 4ef2900 | 2007-07-31 18:31:11 +0800 | [diff] [blame] | 1829 | static const struct seq_operations gfs2_glock_seq_ops = { |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1830 | .start = gfs2_glock_seq_start, |
| 1831 | .next = gfs2_glock_seq_next, |
| 1832 | .stop = gfs2_glock_seq_stop, |
| 1833 | .show = gfs2_glock_seq_show, |
| 1834 | }; |
| 1835 | |
| 1836 | static int gfs2_debugfs_open(struct inode *inode, struct file *file) |
| 1837 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1838 | int ret = seq_open_private(file, &gfs2_glock_seq_ops, |
| 1839 | sizeof(struct gfs2_glock_iter)); |
| 1840 | if (ret == 0) { |
| 1841 | struct seq_file *seq = file->private_data; |
| 1842 | struct gfs2_glock_iter *gi = seq->private; |
| 1843 | gi->sdp = inode->i_private; |
| 1844 | } |
| 1845 | return ret; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1846 | } |
| 1847 | |
| 1848 | static const struct file_operations gfs2_debug_fops = { |
| 1849 | .owner = THIS_MODULE, |
| 1850 | .open = gfs2_debugfs_open, |
| 1851 | .read = seq_read, |
| 1852 | .llseek = seq_lseek, |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1853 | .release = seq_release_private, |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1854 | }; |
| 1855 | |
| 1856 | int gfs2_create_debugfs_file(struct gfs2_sbd *sdp) |
| 1857 | { |
Robert Peterson | 5f88209 | 2007-04-18 11:41:11 -0500 | [diff] [blame] | 1858 | sdp->debugfs_dir = debugfs_create_dir(sdp->sd_table_name, gfs2_root); |
| 1859 | if (!sdp->debugfs_dir) |
| 1860 | return -ENOMEM; |
| 1861 | sdp->debugfs_dentry_glocks = debugfs_create_file("glocks", |
| 1862 | S_IFREG | S_IRUGO, |
| 1863 | sdp->debugfs_dir, sdp, |
| 1864 | &gfs2_debug_fops); |
| 1865 | if (!sdp->debugfs_dentry_glocks) |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1866 | return -ENOMEM; |
| 1867 | |
| 1868 | return 0; |
| 1869 | } |
| 1870 | |
| 1871 | void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp) |
| 1872 | { |
Robert Peterson | 5f88209 | 2007-04-18 11:41:11 -0500 | [diff] [blame] | 1873 | if (sdp && sdp->debugfs_dir) { |
| 1874 | if (sdp->debugfs_dentry_glocks) { |
| 1875 | debugfs_remove(sdp->debugfs_dentry_glocks); |
| 1876 | sdp->debugfs_dentry_glocks = NULL; |
| 1877 | } |
| 1878 | debugfs_remove(sdp->debugfs_dir); |
| 1879 | sdp->debugfs_dir = NULL; |
| 1880 | } |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1881 | } |
| 1882 | |
| 1883 | int gfs2_register_debugfs(void) |
| 1884 | { |
| 1885 | gfs2_root = debugfs_create_dir("gfs2", NULL); |
| 1886 | return gfs2_root ? 0 : -ENOMEM; |
| 1887 | } |
| 1888 | |
| 1889 | void gfs2_unregister_debugfs(void) |
| 1890 | { |
| 1891 | debugfs_remove(gfs2_root); |
Robert Peterson | 5f88209 | 2007-04-18 11:41:11 -0500 | [diff] [blame] | 1892 | gfs2_root = NULL; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1893 | } |