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 | |
Joe Perches | d77d1b5 | 2014-03-06 12:10:45 -0800 | [diff] [blame] | 10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 11 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 12 | #include <linux/sched.h> |
| 13 | #include <linux/slab.h> |
| 14 | #include <linux/spinlock.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 15 | #include <linux/buffer_head.h> |
| 16 | #include <linux/delay.h> |
| 17 | #include <linux/sort.h> |
| 18 | #include <linux/jhash.h> |
Steven Whitehouse | d0dc80d | 2006-03-29 14:36:49 -0500 | [diff] [blame] | 19 | #include <linux/kallsyms.h> |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 20 | #include <linux/gfs2_ondisk.h> |
Steven Whitehouse | 2426443 | 2006-09-11 21:40:30 -0400 | [diff] [blame] | 21 | #include <linux/list.h> |
Steven Whitehouse | fee852e | 2007-01-17 15:33:23 +0000 | [diff] [blame] | 22 | #include <linux/wait.h> |
akpm@linux-foundation.org | 95d97b7 | 2007-03-05 23:10:39 -0800 | [diff] [blame] | 23 | #include <linux/module.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 24 | #include <asm/uaccess.h> |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 25 | #include <linux/seq_file.h> |
| 26 | #include <linux/debugfs.h> |
Steven Whitehouse | 8fbbfd2 | 2007-08-01 13:57:10 +0100 | [diff] [blame] | 27 | #include <linux/kthread.h> |
| 28 | #include <linux/freezer.h> |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 29 | #include <linux/workqueue.h> |
| 30 | #include <linux/jiffies.h> |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 31 | #include <linux/rcupdate.h> |
| 32 | #include <linux/rculist_bl.h> |
| 33 | #include <linux/bit_spinlock.h> |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 34 | #include <linux/percpu.h> |
Steven Whitehouse | 4506a51 | 2013-02-01 20:36:03 +0000 | [diff] [blame] | 35 | #include <linux/list_sort.h> |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 36 | #include <linux/lockref.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 37 | |
| 38 | #include "gfs2.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 39 | #include "incore.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 40 | #include "glock.h" |
| 41 | #include "glops.h" |
| 42 | #include "inode.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 43 | #include "lops.h" |
| 44 | #include "meta_io.h" |
| 45 | #include "quota.h" |
| 46 | #include "super.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 47 | #include "util.h" |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 48 | #include "bmap.h" |
Steven Whitehouse | 6399777 | 2009-06-12 08:49:20 +0100 | [diff] [blame] | 49 | #define CREATE_TRACE_POINTS |
| 50 | #include "trace_gfs2.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 51 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 52 | struct gfs2_glock_iter { |
Steven Whitehouse | ba1ddcb | 2012-06-08 11:16:22 +0100 | [diff] [blame] | 53 | int hash; /* hash bucket index */ |
| 54 | unsigned nhash; /* Index within current bucket */ |
| 55 | struct gfs2_sbd *sdp; /* incore superblock */ |
| 56 | struct gfs2_glock *gl; /* current glock struct */ |
| 57 | loff_t last_pos; /* last position */ |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 58 | }; |
| 59 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 60 | typedef void (*glock_examiner) (struct gfs2_glock * gl); |
| 61 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 62 | 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] | 63 | |
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; |
Benjamin Marzinski | b94a170 | 2009-07-23 18:52:34 -0500 | [diff] [blame] | 66 | struct workqueue_struct *gfs2_delete_workqueue; |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 67 | static LIST_HEAD(lru_list); |
| 68 | static atomic_t lru_count = ATOMIC_INIT(0); |
Julia Lawall | eb8374e | 2008-12-25 15:35:27 +0100 | [diff] [blame] | 69 | static DEFINE_SPINLOCK(lru_lock); |
Adrian Bunk | 08bc2db | 2006-04-28 10:59:12 -0400 | [diff] [blame] | 70 | |
Steven Whitehouse | b639789 | 2006-09-12 10:10:01 -0400 | [diff] [blame] | 71 | #define GFS2_GL_HASH_SHIFT 15 |
Steven Whitehouse | 087efdd | 2006-09-09 16:59:11 -0400 | [diff] [blame] | 72 | #define GFS2_GL_HASH_SIZE (1 << GFS2_GL_HASH_SHIFT) |
| 73 | #define GFS2_GL_HASH_MASK (GFS2_GL_HASH_SIZE - 1) |
| 74 | |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 75 | static struct hlist_bl_head gl_hash_table[GFS2_GL_HASH_SIZE]; |
Robert Peterson | 04b933f | 2007-03-23 17:05:15 -0500 | [diff] [blame] | 76 | static struct dentry *gfs2_root; |
Steven Whitehouse | 087efdd | 2006-09-09 16:59:11 -0400 | [diff] [blame] | 77 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 78 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 79 | * gl_hash() - Turn glock number into hash bucket number |
| 80 | * @lock: The glock number |
| 81 | * |
| 82 | * Returns: The number of the corresponding hash bucket |
| 83 | */ |
| 84 | |
Steven Whitehouse | b854785 | 2006-09-07 13:12:27 -0400 | [diff] [blame] | 85 | static unsigned int gl_hash(const struct gfs2_sbd *sdp, |
| 86 | const struct lm_lockname *name) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 87 | { |
| 88 | unsigned int h; |
| 89 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 90 | h = jhash(&name->ln_number, sizeof(u64), 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 91 | h = jhash(&name->ln_type, sizeof(unsigned int), h); |
Steven Whitehouse | b854785 | 2006-09-07 13:12:27 -0400 | [diff] [blame] | 92 | h = jhash(&sdp, sizeof(struct gfs2_sbd *), h); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 93 | h &= GFS2_GL_HASH_MASK; |
| 94 | |
| 95 | return h; |
| 96 | } |
| 97 | |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 98 | static inline void spin_lock_bucket(unsigned int hash) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 99 | { |
Christoph Hellwig | 1879fd6 | 2011-04-25 14:01:36 -0400 | [diff] [blame] | 100 | hlist_bl_lock(&gl_hash_table[hash]); |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 101 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 102 | |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 103 | static inline void spin_unlock_bucket(unsigned int hash) |
| 104 | { |
Christoph Hellwig | 1879fd6 | 2011-04-25 14:01:36 -0400 | [diff] [blame] | 105 | hlist_bl_unlock(&gl_hash_table[hash]); |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 106 | } |
| 107 | |
Steven Whitehouse | fc0e38d | 2011-03-09 10:58:04 +0000 | [diff] [blame] | 108 | static void gfs2_glock_dealloc(struct rcu_head *rcu) |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 109 | { |
| 110 | struct gfs2_glock *gl = container_of(rcu, struct gfs2_glock, gl_rcu); |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 111 | |
David Teigland | dba2d70 | 2012-11-14 13:46:53 -0500 | [diff] [blame] | 112 | if (gl->gl_ops->go_flags & GLOF_ASPACE) { |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 113 | kmem_cache_free(gfs2_glock_aspace_cachep, gl); |
David Teigland | dba2d70 | 2012-11-14 13:46:53 -0500 | [diff] [blame] | 114 | } else { |
David Teigland | 4e2f884 | 2012-11-14 13:47:37 -0500 | [diff] [blame] | 115 | kfree(gl->gl_lksb.sb_lvbptr); |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 116 | kmem_cache_free(gfs2_glock_cachep, gl); |
David Teigland | dba2d70 | 2012-11-14 13:46:53 -0500 | [diff] [blame] | 117 | } |
Steven Whitehouse | fc0e38d | 2011-03-09 10:58:04 +0000 | [diff] [blame] | 118 | } |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 119 | |
Steven Whitehouse | fc0e38d | 2011-03-09 10:58:04 +0000 | [diff] [blame] | 120 | void gfs2_glock_free(struct gfs2_glock *gl) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 121 | { |
| 122 | struct gfs2_sbd *sdp = gl->gl_sbd; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 123 | |
Steven Whitehouse | fc0e38d | 2011-03-09 10:58:04 +0000 | [diff] [blame] | 124 | call_rcu(&gl->gl_rcu, gfs2_glock_dealloc); |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 125 | if (atomic_dec_and_test(&sdp->sd_glock_disposal)) |
| 126 | wake_up(&sdp->sd_glock_wait); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 127 | } |
| 128 | |
| 129 | /** |
| 130 | * gfs2_glock_hold() - increment reference count on glock |
| 131 | * @gl: The glock to hold |
| 132 | * |
| 133 | */ |
| 134 | |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 135 | static void gfs2_glock_hold(struct gfs2_glock *gl) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 136 | { |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 137 | GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref)); |
| 138 | lockref_get(&gl->gl_lockref); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 139 | } |
| 140 | |
| 141 | /** |
Benjamin Marzinski | 8ff22a6 | 2009-07-10 18:04:24 -0500 | [diff] [blame] | 142 | * demote_ok - Check to see if it's ok to unlock a glock |
| 143 | * @gl: the glock |
| 144 | * |
| 145 | * Returns: 1 if it's ok |
| 146 | */ |
| 147 | |
| 148 | static int demote_ok(const struct gfs2_glock *gl) |
| 149 | { |
| 150 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
| 151 | |
| 152 | if (gl->gl_state == LM_ST_UNLOCKED) |
| 153 | return 0; |
Steven Whitehouse | f42ab08 | 2011-04-14 16:50:31 +0100 | [diff] [blame] | 154 | if (!list_empty(&gl->gl_holders)) |
Benjamin Marzinski | 8ff22a6 | 2009-07-10 18:04:24 -0500 | [diff] [blame] | 155 | return 0; |
| 156 | if (glops->go_demote_ok) |
| 157 | return glops->go_demote_ok(gl); |
| 158 | return 1; |
| 159 | } |
| 160 | |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 161 | |
Steven Whitehouse | 29687a2 | 2011-03-30 16:33:25 +0100 | [diff] [blame] | 162 | void gfs2_glock_add_to_lru(struct gfs2_glock *gl) |
| 163 | { |
| 164 | spin_lock(&lru_lock); |
| 165 | |
| 166 | if (!list_empty(&gl->gl_lru)) |
| 167 | list_del_init(&gl->gl_lru); |
| 168 | else |
| 169 | atomic_inc(&lru_count); |
| 170 | |
| 171 | list_add_tail(&gl->gl_lru, &lru_list); |
Steven Whitehouse | 627c10b | 2011-04-14 14:09:52 +0100 | [diff] [blame] | 172 | set_bit(GLF_LRU, &gl->gl_flags); |
Steven Whitehouse | 29687a2 | 2011-03-30 16:33:25 +0100 | [diff] [blame] | 173 | spin_unlock(&lru_lock); |
| 174 | } |
| 175 | |
Bob Peterson | 8f6cb40 | 2015-01-05 13:25:10 -0500 | [diff] [blame] | 176 | static void gfs2_glock_remove_from_lru(struct gfs2_glock *gl) |
Steven Whitehouse | f42ab08 | 2011-04-14 16:50:31 +0100 | [diff] [blame] | 177 | { |
Bob Peterson | 8f6cb40 | 2015-01-05 13:25:10 -0500 | [diff] [blame] | 178 | spin_lock(&lru_lock); |
Steven Whitehouse | f42ab08 | 2011-04-14 16:50:31 +0100 | [diff] [blame] | 179 | if (!list_empty(&gl->gl_lru)) { |
| 180 | list_del_init(&gl->gl_lru); |
| 181 | atomic_dec(&lru_count); |
| 182 | clear_bit(GLF_LRU, &gl->gl_flags); |
| 183 | } |
| 184 | spin_unlock(&lru_lock); |
| 185 | } |
| 186 | |
Benjamin Marzinski | 8ff22a6 | 2009-07-10 18:04:24 -0500 | [diff] [blame] | 187 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 188 | * gfs2_glock_put() - Decrement reference count on glock |
| 189 | * @gl: The glock to put |
| 190 | * |
| 191 | */ |
| 192 | |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 193 | void gfs2_glock_put(struct gfs2_glock *gl) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 194 | { |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 195 | struct gfs2_sbd *sdp = gl->gl_sbd; |
| 196 | struct address_space *mapping = gfs2_glock2aspace(gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 197 | |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 198 | if (lockref_put_or_lock(&gl->gl_lockref)) |
| 199 | return; |
| 200 | |
| 201 | lockref_mark_dead(&gl->gl_lockref); |
| 202 | |
Bob Peterson | 8f6cb40 | 2015-01-05 13:25:10 -0500 | [diff] [blame] | 203 | gfs2_glock_remove_from_lru(gl); |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 204 | spin_unlock(&gl->gl_lockref.lock); |
| 205 | spin_lock_bucket(gl->gl_hash); |
| 206 | hlist_bl_del_rcu(&gl->gl_list); |
| 207 | spin_unlock_bucket(gl->gl_hash); |
| 208 | GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders)); |
| 209 | GLOCK_BUG_ON(gl, mapping && mapping->nrpages); |
| 210 | trace_gfs2_glock_put(gl); |
| 211 | sdp->sd_lockstruct.ls_ops->lm_put_lock(gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 215 | * search_bucket() - Find struct gfs2_glock by lock number |
| 216 | * @bucket: the bucket to search |
| 217 | * @name: The lock name |
| 218 | * |
| 219 | * Returns: NULL, or the struct gfs2_glock with the requested number |
| 220 | */ |
| 221 | |
Steven Whitehouse | 37b2fa6 | 2006-09-08 13:35:56 -0400 | [diff] [blame] | 222 | static struct gfs2_glock *search_bucket(unsigned int hash, |
Steven Whitehouse | 899be4d | 2006-08-30 12:50:28 -0400 | [diff] [blame] | 223 | const struct gfs2_sbd *sdp, |
Steven Whitehouse | d6a5372 | 2006-08-30 11:16:23 -0400 | [diff] [blame] | 224 | const struct lm_lockname *name) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 225 | { |
| 226 | struct gfs2_glock *gl; |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 227 | struct hlist_bl_node *h; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 228 | |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 229 | hlist_bl_for_each_entry_rcu(gl, h, &gl_hash_table[hash], gl_list) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 230 | if (!lm_name_equal(&gl->gl_name, name)) |
| 231 | continue; |
Steven Whitehouse | 899be4d | 2006-08-30 12:50:28 -0400 | [diff] [blame] | 232 | if (gl->gl_sbd != sdp) |
| 233 | continue; |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 234 | if (lockref_get_not_dead(&gl->gl_lockref)) |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 235 | return gl; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | return NULL; |
| 239 | } |
| 240 | |
| 241 | /** |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 242 | * may_grant - check if its ok to grant a new lock |
| 243 | * @gl: The glock |
| 244 | * @gh: The lock request which we wish to grant |
| 245 | * |
| 246 | * Returns: true if its ok to grant the lock |
| 247 | */ |
| 248 | |
| 249 | 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] | 250 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 251 | const struct gfs2_holder *gh_head = list_entry(gl->gl_holders.next, const struct gfs2_holder, gh_list); |
| 252 | if ((gh->gh_state == LM_ST_EXCLUSIVE || |
| 253 | gh_head->gh_state == LM_ST_EXCLUSIVE) && gh != gh_head) |
| 254 | return 0; |
| 255 | if (gl->gl_state == gh->gh_state) |
| 256 | return 1; |
| 257 | if (gh->gh_flags & GL_EXACT) |
| 258 | return 0; |
Steven Whitehouse | 209806a | 2008-07-07 10:07:28 +0100 | [diff] [blame] | 259 | if (gl->gl_state == LM_ST_EXCLUSIVE) { |
| 260 | if (gh->gh_state == LM_ST_SHARED && gh_head->gh_state == LM_ST_SHARED) |
| 261 | return 1; |
| 262 | if (gh->gh_state == LM_ST_DEFERRED && gh_head->gh_state == LM_ST_DEFERRED) |
| 263 | return 1; |
| 264 | } |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 265 | if (gl->gl_state != LM_ST_UNLOCKED && (gh->gh_flags & LM_FLAG_ANY)) |
| 266 | return 1; |
| 267 | return 0; |
| 268 | } |
| 269 | |
| 270 | static void gfs2_holder_wake(struct gfs2_holder *gh) |
| 271 | { |
| 272 | clear_bit(HIF_WAIT, &gh->gh_iflags); |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 273 | smp_mb__after_atomic(); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 274 | wake_up_bit(&gh->gh_iflags, HIF_WAIT); |
| 275 | } |
| 276 | |
| 277 | /** |
Steven Whitehouse | d5341a9 | 2010-07-23 14:05:51 +0100 | [diff] [blame] | 278 | * do_error - Something unexpected has happened during a lock request |
| 279 | * |
| 280 | */ |
| 281 | |
| 282 | static inline void do_error(struct gfs2_glock *gl, const int ret) |
| 283 | { |
| 284 | struct gfs2_holder *gh, *tmp; |
| 285 | |
| 286 | list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) { |
| 287 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) |
| 288 | continue; |
| 289 | if (ret & LM_OUT_ERROR) |
| 290 | gh->gh_error = -EIO; |
| 291 | else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) |
| 292 | gh->gh_error = GLR_TRYFAILED; |
| 293 | else |
| 294 | continue; |
| 295 | list_del_init(&gh->gh_list); |
| 296 | trace_gfs2_glock_queue(gh, 0); |
| 297 | gfs2_holder_wake(gh); |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | /** |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 302 | * do_promote - promote as many requests as possible on the current queue |
| 303 | * @gl: The glock |
| 304 | * |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 305 | * Returns: 1 if there is a blocked holder at the head of the list, or 2 |
| 306 | * if a type specific operation is underway. |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 307 | */ |
| 308 | |
| 309 | static int do_promote(struct gfs2_glock *gl) |
Harvey Harrison | 55ba474 | 2008-10-24 11:31:12 -0700 | [diff] [blame] | 310 | __releases(&gl->gl_spin) |
| 311 | __acquires(&gl->gl_spin) |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 312 | { |
| 313 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
| 314 | struct gfs2_holder *gh, *tmp; |
| 315 | int ret; |
| 316 | |
| 317 | restart: |
| 318 | list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) { |
| 319 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) |
| 320 | continue; |
| 321 | if (may_grant(gl, gh)) { |
| 322 | if (gh->gh_list.prev == &gl->gl_holders && |
| 323 | glops->go_lock) { |
| 324 | spin_unlock(&gl->gl_spin); |
| 325 | /* FIXME: eliminate this eventually */ |
| 326 | ret = glops->go_lock(gh); |
| 327 | spin_lock(&gl->gl_spin); |
| 328 | if (ret) { |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 329 | if (ret == 1) |
| 330 | return 2; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 331 | gh->gh_error = ret; |
| 332 | list_del_init(&gh->gh_list); |
Steven Whitehouse | 6399777 | 2009-06-12 08:49:20 +0100 | [diff] [blame] | 333 | trace_gfs2_glock_queue(gh, 0); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 334 | gfs2_holder_wake(gh); |
| 335 | goto restart; |
| 336 | } |
| 337 | set_bit(HIF_HOLDER, &gh->gh_iflags); |
Steven Whitehouse | 6399777 | 2009-06-12 08:49:20 +0100 | [diff] [blame] | 338 | trace_gfs2_promote(gh, 1); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 339 | gfs2_holder_wake(gh); |
| 340 | goto restart; |
| 341 | } |
| 342 | set_bit(HIF_HOLDER, &gh->gh_iflags); |
Steven Whitehouse | 6399777 | 2009-06-12 08:49:20 +0100 | [diff] [blame] | 343 | trace_gfs2_promote(gh, 0); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 344 | gfs2_holder_wake(gh); |
| 345 | continue; |
| 346 | } |
| 347 | if (gh->gh_list.prev == &gl->gl_holders) |
| 348 | return 1; |
Steven Whitehouse | d5341a9 | 2010-07-23 14:05:51 +0100 | [diff] [blame] | 349 | do_error(gl, 0); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 350 | break; |
| 351 | } |
| 352 | return 0; |
| 353 | } |
| 354 | |
| 355 | /** |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 356 | * find_first_waiter - find the first gh that's waiting for the glock |
| 357 | * @gl: the glock |
| 358 | */ |
| 359 | |
| 360 | static inline struct gfs2_holder *find_first_waiter(const struct gfs2_glock *gl) |
| 361 | { |
| 362 | struct gfs2_holder *gh; |
| 363 | |
| 364 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { |
| 365 | if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) |
| 366 | return gh; |
| 367 | } |
| 368 | return NULL; |
| 369 | } |
| 370 | |
| 371 | /** |
| 372 | * state_change - record that the glock is now in a different state |
| 373 | * @gl: the glock |
| 374 | * @new_state the new state |
| 375 | * |
| 376 | */ |
| 377 | |
| 378 | static void state_change(struct gfs2_glock *gl, unsigned int new_state) |
| 379 | { |
| 380 | int held1, held2; |
| 381 | |
| 382 | held1 = (gl->gl_state != LM_ST_UNLOCKED); |
| 383 | held2 = (new_state != LM_ST_UNLOCKED); |
| 384 | |
| 385 | if (held1 != held2) { |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 386 | GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref)); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 387 | if (held2) |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 388 | gl->gl_lockref.count++; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 389 | else |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 390 | gl->gl_lockref.count--; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 391 | } |
Steven Whitehouse | 7b5e3d5 | 2010-09-03 09:39:20 +0100 | [diff] [blame] | 392 | if (held1 && held2 && list_empty(&gl->gl_holders)) |
| 393 | clear_bit(GLF_QUEUED, &gl->gl_flags); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 394 | |
Bob Peterson | 7cf8dcd | 2011-06-15 11:41:48 -0400 | [diff] [blame] | 395 | if (new_state != gl->gl_target) |
| 396 | /* shorten our minimum hold time */ |
| 397 | gl->gl_hold_time = max(gl->gl_hold_time - GL_GLOCK_HOLD_DECR, |
| 398 | GL_GLOCK_MIN_HOLD); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 399 | gl->gl_state = new_state; |
| 400 | gl->gl_tchange = jiffies; |
| 401 | } |
| 402 | |
| 403 | static void gfs2_demote_wake(struct gfs2_glock *gl) |
| 404 | { |
| 405 | gl->gl_demote_state = LM_ST_EXCLUSIVE; |
| 406 | clear_bit(GLF_DEMOTE, &gl->gl_flags); |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 407 | smp_mb__after_atomic(); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 408 | wake_up_bit(&gl->gl_flags, GLF_DEMOTE); |
| 409 | } |
| 410 | |
| 411 | /** |
| 412 | * finish_xmote - The DLM has replied to one of our lock requests |
| 413 | * @gl: The glock |
| 414 | * @ret: The status from the DLM |
| 415 | * |
| 416 | */ |
| 417 | |
| 418 | static void finish_xmote(struct gfs2_glock *gl, unsigned int ret) |
| 419 | { |
| 420 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
| 421 | struct gfs2_holder *gh; |
| 422 | unsigned state = ret & LM_OUT_ST_MASK; |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 423 | int rv; |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 424 | |
| 425 | spin_lock(&gl->gl_spin); |
Steven Whitehouse | 6399777 | 2009-06-12 08:49:20 +0100 | [diff] [blame] | 426 | trace_gfs2_glock_state_change(gl, state); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 427 | state_change(gl, state); |
| 428 | gh = find_first_waiter(gl); |
| 429 | |
| 430 | /* Demote to UN request arrived during demote to SH or DF */ |
| 431 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags) && |
| 432 | state != LM_ST_UNLOCKED && gl->gl_demote_state == LM_ST_UNLOCKED) |
| 433 | gl->gl_target = LM_ST_UNLOCKED; |
| 434 | |
| 435 | /* Check for state != intended state */ |
| 436 | if (unlikely(state != gl->gl_target)) { |
| 437 | if (gh && !test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) { |
| 438 | /* move to back of queue and try next entry */ |
| 439 | if (ret & LM_OUT_CANCELED) { |
| 440 | if ((gh->gh_flags & LM_FLAG_PRIORITY) == 0) |
| 441 | list_move_tail(&gh->gh_list, &gl->gl_holders); |
| 442 | gh = find_first_waiter(gl); |
| 443 | gl->gl_target = gh->gh_state; |
| 444 | goto retry; |
| 445 | } |
| 446 | /* Some error or failed "try lock" - report it */ |
| 447 | if ((ret & LM_OUT_ERROR) || |
| 448 | (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) { |
| 449 | gl->gl_target = gl->gl_state; |
| 450 | do_error(gl, ret); |
| 451 | goto out; |
| 452 | } |
| 453 | } |
| 454 | switch(state) { |
| 455 | /* Unlocked due to conversion deadlock, try again */ |
| 456 | case LM_ST_UNLOCKED: |
| 457 | retry: |
| 458 | do_xmote(gl, gh, gl->gl_target); |
| 459 | break; |
| 460 | /* Conversion fails, unlock and try again */ |
| 461 | case LM_ST_SHARED: |
| 462 | case LM_ST_DEFERRED: |
| 463 | do_xmote(gl, gh, LM_ST_UNLOCKED); |
| 464 | break; |
| 465 | default: /* Everything else */ |
Joe Perches | d77d1b5 | 2014-03-06 12:10:45 -0800 | [diff] [blame] | 466 | pr_err("wanted %u got %u\n", gl->gl_target, state); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 467 | GLOCK_BUG_ON(gl, 1); |
| 468 | } |
| 469 | spin_unlock(&gl->gl_spin); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 470 | return; |
| 471 | } |
| 472 | |
| 473 | /* Fast path - we got what we asked for */ |
| 474 | if (test_and_clear_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) |
| 475 | gfs2_demote_wake(gl); |
| 476 | if (state != LM_ST_UNLOCKED) { |
| 477 | if (glops->go_xmote_bh) { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 478 | spin_unlock(&gl->gl_spin); |
| 479 | rv = glops->go_xmote_bh(gl, gh); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 480 | spin_lock(&gl->gl_spin); |
| 481 | if (rv) { |
| 482 | do_error(gl, rv); |
| 483 | goto out; |
| 484 | } |
| 485 | } |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 486 | rv = do_promote(gl); |
| 487 | if (rv == 2) |
| 488 | goto out_locked; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 489 | } |
| 490 | out: |
| 491 | clear_bit(GLF_LOCK, &gl->gl_flags); |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 492 | out_locked: |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 493 | spin_unlock(&gl->gl_spin); |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 494 | } |
| 495 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 496 | /** |
| 497 | * do_xmote - Calls the DLM to change the state of a lock |
| 498 | * @gl: The lock state |
| 499 | * @gh: The holder (only for promotes) |
| 500 | * @target: The target lock state |
| 501 | * |
| 502 | */ |
| 503 | |
| 504 | 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] | 505 | __releases(&gl->gl_spin) |
| 506 | __acquires(&gl->gl_spin) |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 507 | { |
| 508 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
| 509 | struct gfs2_sbd *sdp = gl->gl_sbd; |
| 510 | unsigned int lck_flags = gh ? gh->gh_flags : 0; |
| 511 | int ret; |
| 512 | |
| 513 | lck_flags &= (LM_FLAG_TRY | LM_FLAG_TRY_1CB | LM_FLAG_NOEXP | |
| 514 | LM_FLAG_PRIORITY); |
Steven Whitehouse | 921169c | 2010-11-29 12:50:38 +0000 | [diff] [blame] | 515 | GLOCK_BUG_ON(gl, gl->gl_state == target); |
| 516 | GLOCK_BUG_ON(gl, gl->gl_state == gl->gl_target); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 517 | if ((target == LM_ST_UNLOCKED || target == LM_ST_DEFERRED) && |
| 518 | glops->go_inval) { |
| 519 | set_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags); |
| 520 | do_error(gl, 0); /* Fail queued try locks */ |
| 521 | } |
Steven Whitehouse | 47a2538 | 2010-11-30 15:49:31 +0000 | [diff] [blame] | 522 | gl->gl_req = target; |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 523 | set_bit(GLF_BLOCKING, &gl->gl_flags); |
| 524 | if ((gl->gl_req == LM_ST_UNLOCKED) || |
| 525 | (gl->gl_state == LM_ST_EXCLUSIVE) || |
| 526 | (lck_flags & (LM_FLAG_TRY|LM_FLAG_TRY_1CB))) |
| 527 | clear_bit(GLF_BLOCKING, &gl->gl_flags); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 528 | spin_unlock(&gl->gl_spin); |
Bob Peterson | 06dfc30 | 2012-10-24 14:41:05 -0400 | [diff] [blame] | 529 | if (glops->go_sync) |
| 530 | glops->go_sync(gl); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 531 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) |
| 532 | glops->go_inval(gl, target == LM_ST_DEFERRED ? 0 : DIO_METADATA); |
| 533 | clear_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags); |
| 534 | |
| 535 | gfs2_glock_hold(gl); |
Steven Whitehouse | 921169c | 2010-11-29 12:50:38 +0000 | [diff] [blame] | 536 | if (sdp->sd_lockstruct.ls_ops->lm_lock) { |
| 537 | /* lock_dlm */ |
| 538 | ret = sdp->sd_lockstruct.ls_ops->lm_lock(gl, target, lck_flags); |
David Teigland | dba2d70 | 2012-11-14 13:46:53 -0500 | [diff] [blame] | 539 | if (ret) { |
Joe Perches | d77d1b5 | 2014-03-06 12:10:45 -0800 | [diff] [blame] | 540 | pr_err("lm_lock ret %d\n", ret); |
David Teigland | dba2d70 | 2012-11-14 13:46:53 -0500 | [diff] [blame] | 541 | GLOCK_BUG_ON(gl, 1); |
| 542 | } |
Steven Whitehouse | 921169c | 2010-11-29 12:50:38 +0000 | [diff] [blame] | 543 | } else { /* lock_nolock */ |
| 544 | finish_xmote(gl, target); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 545 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
| 546 | gfs2_glock_put(gl); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 547 | } |
Steven Whitehouse | 921169c | 2010-11-29 12:50:38 +0000 | [diff] [blame] | 548 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 549 | spin_lock(&gl->gl_spin); |
| 550 | } |
| 551 | |
| 552 | /** |
| 553 | * find_first_holder - find the first "holder" gh |
| 554 | * @gl: the glock |
| 555 | */ |
| 556 | |
| 557 | static inline struct gfs2_holder *find_first_holder(const struct gfs2_glock *gl) |
| 558 | { |
| 559 | struct gfs2_holder *gh; |
| 560 | |
| 561 | if (!list_empty(&gl->gl_holders)) { |
| 562 | gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list); |
| 563 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) |
| 564 | return gh; |
| 565 | } |
| 566 | return NULL; |
| 567 | } |
| 568 | |
| 569 | /** |
| 570 | * run_queue - do all outstanding tasks related to a glock |
| 571 | * @gl: The glock in question |
| 572 | * @nonblock: True if we must not block in run_queue |
| 573 | * |
| 574 | */ |
| 575 | |
| 576 | static void run_queue(struct gfs2_glock *gl, const int nonblock) |
Harvey Harrison | 55ba474 | 2008-10-24 11:31:12 -0700 | [diff] [blame] | 577 | __releases(&gl->gl_spin) |
| 578 | __acquires(&gl->gl_spin) |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 579 | { |
| 580 | struct gfs2_holder *gh = NULL; |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 581 | int ret; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 582 | |
| 583 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) |
| 584 | return; |
| 585 | |
| 586 | GLOCK_BUG_ON(gl, test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)); |
| 587 | |
| 588 | if (test_bit(GLF_DEMOTE, &gl->gl_flags) && |
| 589 | gl->gl_demote_state != gl->gl_state) { |
| 590 | if (find_first_holder(gl)) |
Steven Whitehouse | d8348de | 2009-02-05 10:12:38 +0000 | [diff] [blame] | 591 | goto out_unlock; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 592 | if (nonblock) |
| 593 | goto out_sched; |
| 594 | set_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags); |
Steven Whitehouse | 265d529c | 2008-07-07 10:02:36 +0100 | [diff] [blame] | 595 | GLOCK_BUG_ON(gl, gl->gl_demote_state == LM_ST_EXCLUSIVE); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 596 | gl->gl_target = gl->gl_demote_state; |
| 597 | } else { |
| 598 | if (test_bit(GLF_DEMOTE, &gl->gl_flags)) |
| 599 | gfs2_demote_wake(gl); |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 600 | ret = do_promote(gl); |
| 601 | if (ret == 0) |
Steven Whitehouse | d8348de | 2009-02-05 10:12:38 +0000 | [diff] [blame] | 602 | goto out_unlock; |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 603 | if (ret == 2) |
Steven Whitehouse | a228df6 | 2009-04-07 14:01:34 +0100 | [diff] [blame] | 604 | goto out; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 605 | gh = find_first_waiter(gl); |
| 606 | gl->gl_target = gh->gh_state; |
| 607 | if (!(gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) |
| 608 | do_error(gl, 0); /* Fail queued try locks */ |
| 609 | } |
| 610 | do_xmote(gl, gh, gl->gl_target); |
Steven Whitehouse | a228df6 | 2009-04-07 14:01:34 +0100 | [diff] [blame] | 611 | out: |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 612 | return; |
| 613 | |
| 614 | out_sched: |
Steven Whitehouse | 7e71c55 | 2009-09-22 10:56:16 +0100 | [diff] [blame] | 615 | clear_bit(GLF_LOCK, &gl->gl_flags); |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 616 | smp_mb__after_atomic(); |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 617 | gl->gl_lockref.count++; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 618 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 619 | gl->gl_lockref.count--; |
Steven Whitehouse | 7e71c55 | 2009-09-22 10:56:16 +0100 | [diff] [blame] | 620 | return; |
| 621 | |
Steven Whitehouse | d8348de | 2009-02-05 10:12:38 +0000 | [diff] [blame] | 622 | out_unlock: |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 623 | clear_bit(GLF_LOCK, &gl->gl_flags); |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 624 | smp_mb__after_atomic(); |
Steven Whitehouse | 7e71c55 | 2009-09-22 10:56:16 +0100 | [diff] [blame] | 625 | return; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 626 | } |
| 627 | |
Benjamin Marzinski | b94a170 | 2009-07-23 18:52:34 -0500 | [diff] [blame] | 628 | static void delete_work_func(struct work_struct *work) |
| 629 | { |
| 630 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_delete); |
| 631 | struct gfs2_sbd *sdp = gl->gl_sbd; |
Steven Whitehouse | 044b941 | 2010-11-03 20:01:07 +0000 | [diff] [blame] | 632 | struct gfs2_inode *ip; |
Benjamin Marzinski | b94a170 | 2009-07-23 18:52:34 -0500 | [diff] [blame] | 633 | struct inode *inode; |
Steven Whitehouse | 044b941 | 2010-11-03 20:01:07 +0000 | [diff] [blame] | 634 | u64 no_addr = gl->gl_name.ln_number; |
Benjamin Marzinski | b94a170 | 2009-07-23 18:52:34 -0500 | [diff] [blame] | 635 | |
Steven Whitehouse | 044b941 | 2010-11-03 20:01:07 +0000 | [diff] [blame] | 636 | ip = gl->gl_object; |
| 637 | /* Note: Unsafe to dereference ip as we don't hold right refs/locks */ |
| 638 | |
Benjamin Marzinski | b94a170 | 2009-07-23 18:52:34 -0500 | [diff] [blame] | 639 | if (ip) |
Steven Whitehouse | 4667a0e | 2011-04-18 14:18:09 +0100 | [diff] [blame] | 640 | inode = gfs2_ilookup(sdp->sd_vfs, no_addr, 1); |
Steven Whitehouse | 044b941 | 2010-11-03 20:01:07 +0000 | [diff] [blame] | 641 | else |
| 642 | inode = gfs2_lookup_by_inum(sdp, no_addr, NULL, GFS2_BLKST_UNLINKED); |
| 643 | if (inode && !IS_ERR(inode)) { |
| 644 | d_prune_aliases(inode); |
| 645 | iput(inode); |
Benjamin Marzinski | b94a170 | 2009-07-23 18:52:34 -0500 | [diff] [blame] | 646 | } |
| 647 | gfs2_glock_put(gl); |
| 648 | } |
| 649 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 650 | static void glock_work_func(struct work_struct *work) |
| 651 | { |
| 652 | unsigned long delay = 0; |
| 653 | struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_work.work); |
Steven Whitehouse | 26bb750 | 2009-11-27 10:31:11 +0000 | [diff] [blame] | 654 | int drop_ref = 0; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 655 | |
Steven Whitehouse | 26bb750 | 2009-11-27 10:31:11 +0000 | [diff] [blame] | 656 | if (test_and_clear_bit(GLF_REPLY_PENDING, &gl->gl_flags)) { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 657 | finish_xmote(gl, gl->gl_reply); |
Steven Whitehouse | 26bb750 | 2009-11-27 10:31:11 +0000 | [diff] [blame] | 658 | drop_ref = 1; |
| 659 | } |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 660 | spin_lock(&gl->gl_spin); |
Bob Peterson | f90e5b5 | 2011-05-24 10:44:42 -0400 | [diff] [blame] | 661 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && |
Steven Whitehouse | 265d529c | 2008-07-07 10:02:36 +0100 | [diff] [blame] | 662 | gl->gl_state != LM_ST_UNLOCKED && |
| 663 | gl->gl_demote_state != LM_ST_EXCLUSIVE) { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 664 | unsigned long holdtime, now = jiffies; |
Bob Peterson | f90e5b5 | 2011-05-24 10:44:42 -0400 | [diff] [blame] | 665 | |
Bob Peterson | 7cf8dcd | 2011-06-15 11:41:48 -0400 | [diff] [blame] | 666 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 667 | if (time_before(now, holdtime)) |
| 668 | delay = holdtime - now; |
Bob Peterson | f90e5b5 | 2011-05-24 10:44:42 -0400 | [diff] [blame] | 669 | |
| 670 | if (!delay) { |
| 671 | clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags); |
| 672 | set_bit(GLF_DEMOTE, &gl->gl_flags); |
| 673 | } |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 674 | } |
| 675 | run_queue(gl, 0); |
| 676 | spin_unlock(&gl->gl_spin); |
Bob Peterson | 7cf8dcd | 2011-06-15 11:41:48 -0400 | [diff] [blame] | 677 | if (!delay) |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 678 | gfs2_glock_put(gl); |
Bob Peterson | 7cf8dcd | 2011-06-15 11:41:48 -0400 | [diff] [blame] | 679 | else { |
| 680 | if (gl->gl_name.ln_type != LM_TYPE_INODE) |
| 681 | delay = 0; |
| 682 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) |
| 683 | gfs2_glock_put(gl); |
| 684 | } |
Steven Whitehouse | 26bb750 | 2009-11-27 10:31:11 +0000 | [diff] [blame] | 685 | if (drop_ref) |
| 686 | gfs2_glock_put(gl); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 687 | } |
| 688 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 689 | /** |
| 690 | * gfs2_glock_get() - Get a glock, or create one if one doesn't exist |
| 691 | * @sdp: The GFS2 superblock |
| 692 | * @number: the lock number |
| 693 | * @glops: The glock_operations to use |
| 694 | * @create: If 0, don't create the glock if it doesn't exist |
| 695 | * @glp: the glock is returned here |
| 696 | * |
| 697 | * This does not lock a glock, just finds/creates structures for one. |
| 698 | * |
| 699 | * Returns: errno |
| 700 | */ |
| 701 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 702 | int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, |
Steven Whitehouse | 8fb4b53 | 2006-08-30 09:30:00 -0400 | [diff] [blame] | 703 | const struct gfs2_glock_operations *glops, int create, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 704 | struct gfs2_glock **glp) |
| 705 | { |
Steven Whitehouse | 009d851 | 2009-12-08 12:12:13 +0000 | [diff] [blame] | 706 | struct super_block *s = sdp->sd_vfs; |
Steven Whitehouse | 37b2fa6 | 2006-09-08 13:35:56 -0400 | [diff] [blame] | 707 | struct lm_lockname name = { .ln_number = number, .ln_type = glops->go_type }; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 708 | struct gfs2_glock *gl, *tmp; |
Steven Whitehouse | 37b2fa6 | 2006-09-08 13:35:56 -0400 | [diff] [blame] | 709 | unsigned int hash = gl_hash(sdp, &name); |
Steven Whitehouse | 009d851 | 2009-12-08 12:12:13 +0000 | [diff] [blame] | 710 | struct address_space *mapping; |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 711 | struct kmem_cache *cachep; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 712 | |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 713 | rcu_read_lock(); |
Steven Whitehouse | 37b2fa6 | 2006-09-08 13:35:56 -0400 | [diff] [blame] | 714 | gl = search_bucket(hash, sdp, &name); |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 715 | rcu_read_unlock(); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 716 | |
Steven Whitehouse | 64d576b | 2009-02-12 13:31:58 +0000 | [diff] [blame] | 717 | *glp = gl; |
| 718 | if (gl) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 719 | return 0; |
Steven Whitehouse | 64d576b | 2009-02-12 13:31:58 +0000 | [diff] [blame] | 720 | if (!create) |
| 721 | return -ENOENT; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 722 | |
Steven Whitehouse | 009d851 | 2009-12-08 12:12:13 +0000 | [diff] [blame] | 723 | if (glops->go_flags & GLOF_ASPACE) |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 724 | cachep = gfs2_glock_aspace_cachep; |
Steven Whitehouse | 009d851 | 2009-12-08 12:12:13 +0000 | [diff] [blame] | 725 | else |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 726 | cachep = gfs2_glock_cachep; |
Steven Whitehouse | fe0bbd2 | 2014-06-23 14:50:20 +0100 | [diff] [blame] | 727 | gl = kmem_cache_alloc(cachep, GFP_NOFS); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 728 | if (!gl) |
| 729 | return -ENOMEM; |
| 730 | |
David Teigland | dba2d70 | 2012-11-14 13:46:53 -0500 | [diff] [blame] | 731 | memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb)); |
David Teigland | dba2d70 | 2012-11-14 13:46:53 -0500 | [diff] [blame] | 732 | |
| 733 | if (glops->go_flags & GLOF_LVB) { |
Steven Whitehouse | fe0bbd2 | 2014-06-23 14:50:20 +0100 | [diff] [blame] | 734 | gl->gl_lksb.sb_lvbptr = kzalloc(GFS2_MIN_LVB_SIZE, GFP_NOFS); |
David Teigland | 4e2f884 | 2012-11-14 13:47:37 -0500 | [diff] [blame] | 735 | if (!gl->gl_lksb.sb_lvbptr) { |
David Teigland | dba2d70 | 2012-11-14 13:46:53 -0500 | [diff] [blame] | 736 | kmem_cache_free(cachep, gl); |
| 737 | return -ENOMEM; |
| 738 | } |
David Teigland | dba2d70 | 2012-11-14 13:46:53 -0500 | [diff] [blame] | 739 | } |
| 740 | |
Steven Whitehouse | 8f05228 | 2010-01-29 15:21:27 +0000 | [diff] [blame] | 741 | atomic_inc(&sdp->sd_glock_disposal); |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 742 | gl->gl_sbd = sdp; |
Steven Whitehouse | ec45d9f | 2006-08-30 10:36:52 -0400 | [diff] [blame] | 743 | gl->gl_flags = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 744 | gl->gl_name = name; |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 745 | gl->gl_lockref.count = 1; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 746 | gl->gl_state = LM_ST_UNLOCKED; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 747 | gl->gl_target = LM_ST_UNLOCKED; |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 748 | gl->gl_demote_state = LM_ST_EXCLUSIVE; |
Steven Whitehouse | 37b2fa6 | 2006-09-08 13:35:56 -0400 | [diff] [blame] | 749 | gl->gl_hash = hash; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 750 | gl->gl_ops = glops; |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 751 | gl->gl_dstamp = ktime_set(0, 0); |
| 752 | preempt_disable(); |
| 753 | /* We use the global stats to estimate the initial per-glock stats */ |
| 754 | gl->gl_stats = this_cpu_ptr(sdp->sd_lkstats)->lkstats[glops->go_type]; |
| 755 | preempt_enable(); |
| 756 | gl->gl_stats.stats[GFS2_LKS_DCOUNT] = 0; |
| 757 | gl->gl_stats.stats[GFS2_LKS_QCOUNT] = 0; |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 758 | gl->gl_tchange = jiffies; |
Steven Whitehouse | ec45d9f | 2006-08-30 10:36:52 -0400 | [diff] [blame] | 759 | gl->gl_object = NULL; |
Bob Peterson | 7cf8dcd | 2011-06-15 11:41:48 -0400 | [diff] [blame] | 760 | gl->gl_hold_time = GL_GLOCK_DFT_HOLD; |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 761 | INIT_DELAYED_WORK(&gl->gl_work, glock_work_func); |
Benjamin Marzinski | b94a170 | 2009-07-23 18:52:34 -0500 | [diff] [blame] | 762 | INIT_WORK(&gl->gl_delete, delete_work_func); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 763 | |
Steven Whitehouse | 009d851 | 2009-12-08 12:12:13 +0000 | [diff] [blame] | 764 | mapping = gfs2_glock2aspace(gl); |
| 765 | if (mapping) { |
| 766 | mapping->a_ops = &gfs2_meta_aops; |
| 767 | mapping->host = s->s_bdev->bd_inode; |
| 768 | mapping->flags = 0; |
| 769 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
Rafael Aquini | 252aa6f | 2012-12-11 16:02:35 -0800 | [diff] [blame] | 770 | mapping->private_data = NULL; |
Steven Whitehouse | 009d851 | 2009-12-08 12:12:13 +0000 | [diff] [blame] | 771 | mapping->writeback_index = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 772 | } |
| 773 | |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 774 | spin_lock_bucket(hash); |
Steven Whitehouse | 37b2fa6 | 2006-09-08 13:35:56 -0400 | [diff] [blame] | 775 | tmp = search_bucket(hash, sdp, &name); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 776 | if (tmp) { |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 777 | spin_unlock_bucket(hash); |
David Teigland | 4e2f884 | 2012-11-14 13:47:37 -0500 | [diff] [blame] | 778 | kfree(gl->gl_lksb.sb_lvbptr); |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 779 | kmem_cache_free(cachep, gl); |
Steven Whitehouse | fc0e38d | 2011-03-09 10:58:04 +0000 | [diff] [blame] | 780 | atomic_dec(&sdp->sd_glock_disposal); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 781 | gl = tmp; |
| 782 | } else { |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 783 | hlist_bl_add_head_rcu(&gl->gl_list, &gl_hash_table[hash]); |
| 784 | spin_unlock_bucket(hash); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 785 | } |
| 786 | |
| 787 | *glp = gl; |
| 788 | |
| 789 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 790 | } |
| 791 | |
| 792 | /** |
| 793 | * gfs2_holder_init - initialize a struct gfs2_holder in the default way |
| 794 | * @gl: the glock |
| 795 | * @state: the state we're requesting |
| 796 | * @flags: the modifier flags |
| 797 | * @gh: the holder structure |
| 798 | * |
| 799 | */ |
| 800 | |
Steven Whitehouse | 190562b | 2006-04-20 16:57:23 -0400 | [diff] [blame] | 801 | 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] | 802 | struct gfs2_holder *gh) |
| 803 | { |
| 804 | INIT_LIST_HEAD(&gh->gh_list); |
| 805 | gh->gh_gl = gl; |
Fabian Frederick | d29c0af | 2014-10-03 20:15:36 +0200 | [diff] [blame] | 806 | gh->gh_ip = _RET_IP_; |
Pavel Emelyanov | b1e058d | 2008-02-07 00:13:19 -0800 | [diff] [blame] | 807 | gh->gh_owner_pid = get_pid(task_pid(current)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 808 | gh->gh_state = state; |
| 809 | gh->gh_flags = flags; |
| 810 | gh->gh_error = 0; |
| 811 | gh->gh_iflags = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 812 | gfs2_glock_hold(gl); |
| 813 | } |
| 814 | |
| 815 | /** |
| 816 | * gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it |
| 817 | * @state: the state we're requesting |
| 818 | * @flags: the modifier flags |
| 819 | * @gh: the holder structure |
| 820 | * |
| 821 | * Don't mess with the glock. |
| 822 | * |
| 823 | */ |
| 824 | |
Steven Whitehouse | 190562b | 2006-04-20 16:57:23 -0400 | [diff] [blame] | 825 | 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] | 826 | { |
| 827 | gh->gh_state = state; |
Steven Whitehouse | 579b78a | 2006-04-26 14:58:26 -0400 | [diff] [blame] | 828 | gh->gh_flags = flags; |
Steven Whitehouse | 3b8249f | 2007-03-16 09:40:31 +0000 | [diff] [blame] | 829 | gh->gh_iflags = 0; |
Fabian Frederick | d29c0af | 2014-10-03 20:15:36 +0200 | [diff] [blame] | 830 | gh->gh_ip = _RET_IP_; |
Markus Elfring | 30badc9 | 2014-11-18 11:31:23 +0100 | [diff] [blame] | 831 | put_pid(gh->gh_owner_pid); |
Bob Peterson | 1a0eae8 | 2010-04-14 11:58:16 -0400 | [diff] [blame] | 832 | gh->gh_owner_pid = get_pid(task_pid(current)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 833 | } |
| 834 | |
| 835 | /** |
| 836 | * gfs2_holder_uninit - uninitialize a holder structure (drop glock reference) |
| 837 | * @gh: the holder structure |
| 838 | * |
| 839 | */ |
| 840 | |
| 841 | void gfs2_holder_uninit(struct gfs2_holder *gh) |
| 842 | { |
Pavel Emelyanov | b1e058d | 2008-02-07 00:13:19 -0800 | [diff] [blame] | 843 | put_pid(gh->gh_owner_pid); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 844 | gfs2_glock_put(gh->gh_gl); |
| 845 | gh->gh_gl = NULL; |
Steven Whitehouse | d0dc80d | 2006-03-29 14:36:49 -0500 | [diff] [blame] | 846 | gh->gh_ip = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 847 | } |
| 848 | |
Steven Whitehouse | fe64d51 | 2009-05-19 10:01:18 +0100 | [diff] [blame] | 849 | /** |
Bob Peterson | 07a7904 | 2012-08-09 12:48:44 -0500 | [diff] [blame] | 850 | * gfs2_glock_wait - wait on a glock acquisition |
| 851 | * @gh: the glock holder |
| 852 | * |
| 853 | * Returns: 0 on success |
| 854 | */ |
| 855 | |
| 856 | int gfs2_glock_wait(struct gfs2_holder *gh) |
Steven Whitehouse | fee852e | 2007-01-17 15:33:23 +0000 | [diff] [blame] | 857 | { |
Bob Peterson | 7cf8dcd | 2011-06-15 11:41:48 -0400 | [diff] [blame] | 858 | unsigned long time1 = jiffies; |
| 859 | |
Steven Whitehouse | fee852e | 2007-01-17 15:33:23 +0000 | [diff] [blame] | 860 | might_sleep(); |
NeilBrown | 7431620 | 2014-07-07 15:16:04 +1000 | [diff] [blame] | 861 | wait_on_bit(&gh->gh_iflags, HIF_WAIT, TASK_UNINTERRUPTIBLE); |
Bob Peterson | 7cf8dcd | 2011-06-15 11:41:48 -0400 | [diff] [blame] | 862 | if (time_after(jiffies, time1 + HZ)) /* have we waited > a second? */ |
| 863 | /* Lengthen the minimum hold time. */ |
| 864 | gh->gh_gl->gl_hold_time = min(gh->gh_gl->gl_hold_time + |
| 865 | GL_GLOCK_HOLD_INCR, |
| 866 | GL_GLOCK_MAX_HOLD); |
Bob Peterson | 07a7904 | 2012-08-09 12:48:44 -0500 | [diff] [blame] | 867 | return gh->gh_error; |
Abhijith Das | d93cfa9 | 2007-06-11 08:22:32 +0100 | [diff] [blame] | 868 | } |
| 869 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 870 | /** |
Steven Whitehouse | 3b8249f | 2007-03-16 09:40:31 +0000 | [diff] [blame] | 871 | * handle_callback - process a demote request |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 872 | * @gl: the glock |
| 873 | * @state: the state the caller wants us to change to |
| 874 | * |
Steven Whitehouse | 3b8249f | 2007-03-16 09:40:31 +0000 | [diff] [blame] | 875 | * There are only two requests that we are going to see in actual |
| 876 | * practise: LM_ST_SHARED and LM_ST_UNLOCKED |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 877 | */ |
| 878 | |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 879 | static void handle_callback(struct gfs2_glock *gl, unsigned int state, |
Steven Whitehouse | 81ffbf6 | 2013-04-10 10:26:55 +0100 | [diff] [blame] | 880 | unsigned long delay, bool remote) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 881 | { |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 882 | int bit = delay ? GLF_PENDING_DEMOTE : GLF_DEMOTE; |
| 883 | |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 884 | set_bit(bit, &gl->gl_flags); |
| 885 | if (gl->gl_demote_state == LM_ST_EXCLUSIVE) { |
Steven Whitehouse | 3b8249f | 2007-03-16 09:40:31 +0000 | [diff] [blame] | 886 | gl->gl_demote_state = state; |
| 887 | gl->gl_demote_time = jiffies; |
Josef Whiter | 26caee5 | 2007-07-23 10:02:40 +0100 | [diff] [blame] | 888 | } else if (gl->gl_demote_state != LM_ST_UNLOCKED && |
| 889 | gl->gl_demote_state != state) { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 890 | gl->gl_demote_state = LM_ST_UNLOCKED; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 891 | } |
Benjamin Marzinski | b94a170 | 2009-07-23 18:52:34 -0500 | [diff] [blame] | 892 | if (gl->gl_ops->go_callback) |
Steven Whitehouse | 81ffbf6 | 2013-04-10 10:26:55 +0100 | [diff] [blame] | 893 | gl->gl_ops->go_callback(gl, remote); |
Steven Whitehouse | 7bd8b2e | 2013-04-10 10:32:05 +0100 | [diff] [blame] | 894 | trace_gfs2_demote_rq(gl, remote); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 895 | } |
| 896 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 897 | void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...) |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 898 | { |
Joe Perches | 5e69069 | 2010-11-09 16:35:20 -0800 | [diff] [blame] | 899 | struct va_format vaf; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 900 | va_list args; |
| 901 | |
| 902 | va_start(args, fmt); |
Joe Perches | 5e69069 | 2010-11-09 16:35:20 -0800 | [diff] [blame] | 903 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 904 | if (seq) { |
Steven Whitehouse | 1bb4930 | 2012-06-11 13:26:50 +0100 | [diff] [blame] | 905 | seq_vprintf(seq, fmt, args); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 906 | } else { |
Joe Perches | 5e69069 | 2010-11-09 16:35:20 -0800 | [diff] [blame] | 907 | vaf.fmt = fmt; |
| 908 | vaf.va = &args; |
| 909 | |
Joe Perches | d77d1b5 | 2014-03-06 12:10:45 -0800 | [diff] [blame] | 910 | pr_err("%pV", &vaf); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 911 | } |
Joe Perches | 5e69069 | 2010-11-09 16:35:20 -0800 | [diff] [blame] | 912 | |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 913 | va_end(args); |
| 914 | } |
| 915 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 916 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 917 | * add_to_queue - Add a holder to the wait queue (but look for recursion) |
| 918 | * @gh: the holder structure to add |
| 919 | * |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 920 | * Eventually we should move the recursive locking trap to a |
| 921 | * debugging option or something like that. This is the fast |
| 922 | * path and needs to have the minimum number of distractions. |
| 923 | * |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 924 | */ |
| 925 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 926 | static inline void add_to_queue(struct gfs2_holder *gh) |
Harvey Harrison | 55ba474 | 2008-10-24 11:31:12 -0700 | [diff] [blame] | 927 | __releases(&gl->gl_spin) |
| 928 | __acquires(&gl->gl_spin) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 929 | { |
| 930 | struct gfs2_glock *gl = gh->gh_gl; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 931 | struct gfs2_sbd *sdp = gl->gl_sbd; |
| 932 | struct list_head *insert_pt = NULL; |
| 933 | struct gfs2_holder *gh2; |
Bob Peterson | e5dc76b | 2012-08-09 12:48:46 -0500 | [diff] [blame] | 934 | int try_futile = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 935 | |
Pavel Emelyanov | b1e058d | 2008-02-07 00:13:19 -0800 | [diff] [blame] | 936 | BUG_ON(gh->gh_owner_pid == NULL); |
Steven Whitehouse | fee852e | 2007-01-17 15:33:23 +0000 | [diff] [blame] | 937 | if (test_and_set_bit(HIF_WAIT, &gh->gh_iflags)) |
| 938 | BUG(); |
Steven Whitehouse | 190562b | 2006-04-20 16:57:23 -0400 | [diff] [blame] | 939 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 940 | if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) { |
| 941 | if (test_bit(GLF_LOCK, &gl->gl_flags)) |
Bob Peterson | e5dc76b | 2012-08-09 12:48:46 -0500 | [diff] [blame] | 942 | try_futile = !may_grant(gl, gh); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 943 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) |
| 944 | goto fail; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 945 | } |
| 946 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 947 | list_for_each_entry(gh2, &gl->gl_holders, gh_list) { |
| 948 | if (unlikely(gh2->gh_owner_pid == gh->gh_owner_pid && |
| 949 | (gh->gh_gl->gl_ops->go_type != LM_TYPE_FLOCK))) |
| 950 | goto trap_recursive; |
Bob Peterson | e5dc76b | 2012-08-09 12:48:46 -0500 | [diff] [blame] | 951 | if (try_futile && |
| 952 | !(gh2->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 953 | fail: |
| 954 | gh->gh_error = GLR_TRYFAILED; |
| 955 | gfs2_holder_wake(gh); |
| 956 | return; |
| 957 | } |
| 958 | if (test_bit(HIF_HOLDER, &gh2->gh_iflags)) |
| 959 | continue; |
| 960 | if (unlikely((gh->gh_flags & LM_FLAG_PRIORITY) && !insert_pt)) |
| 961 | insert_pt = &gh2->gh_list; |
| 962 | } |
Steven Whitehouse | 7b5e3d5 | 2010-09-03 09:39:20 +0100 | [diff] [blame] | 963 | set_bit(GLF_QUEUED, &gl->gl_flags); |
Steven Whitehouse | edae38a | 2011-01-31 09:38:12 +0000 | [diff] [blame] | 964 | trace_gfs2_glock_queue(gh, 1); |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 965 | gfs2_glstats_inc(gl, GFS2_LKS_QCOUNT); |
| 966 | gfs2_sbstats_inc(gl, GFS2_LKS_QCOUNT); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 967 | if (likely(insert_pt == NULL)) { |
| 968 | list_add_tail(&gh->gh_list, &gl->gl_holders); |
| 969 | if (unlikely(gh->gh_flags & LM_FLAG_PRIORITY)) |
| 970 | goto do_cancel; |
| 971 | return; |
| 972 | } |
| 973 | list_add_tail(&gh->gh_list, insert_pt); |
| 974 | do_cancel: |
| 975 | gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list); |
| 976 | if (!(gh->gh_flags & LM_FLAG_PRIORITY)) { |
| 977 | spin_unlock(&gl->gl_spin); |
Steven Whitehouse | 048bca2 | 2008-05-23 14:46:04 +0100 | [diff] [blame] | 978 | if (sdp->sd_lockstruct.ls_ops->lm_cancel) |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 979 | sdp->sd_lockstruct.ls_ops->lm_cancel(gl); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 980 | spin_lock(&gl->gl_spin); |
| 981 | } |
| 982 | return; |
| 983 | |
| 984 | trap_recursive: |
Fabian Frederick | fc554ed | 2014-03-05 22:06:42 +0800 | [diff] [blame] | 985 | pr_err("original: %pSR\n", (void *)gh2->gh_ip); |
| 986 | pr_err("pid: %d\n", pid_nr(gh2->gh_owner_pid)); |
| 987 | pr_err("lock type: %d req lock state : %d\n", |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 988 | gh2->gh_gl->gl_name.ln_type, gh2->gh_state); |
Fabian Frederick | fc554ed | 2014-03-05 22:06:42 +0800 | [diff] [blame] | 989 | pr_err("new: %pSR\n", (void *)gh->gh_ip); |
| 990 | pr_err("pid: %d\n", pid_nr(gh->gh_owner_pid)); |
| 991 | pr_err("lock type: %d req lock state : %d\n", |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 992 | gh->gh_gl->gl_name.ln_type, gh->gh_state); |
Steven Whitehouse | 8eae1ca | 2012-10-15 10:57:02 +0100 | [diff] [blame] | 993 | gfs2_dump_glock(NULL, gl); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 994 | BUG(); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 995 | } |
| 996 | |
| 997 | /** |
| 998 | * gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock) |
| 999 | * @gh: the holder structure |
| 1000 | * |
| 1001 | * if (gh->gh_flags & GL_ASYNC), this never returns an error |
| 1002 | * |
| 1003 | * Returns: 0, GLR_TRYFAILED, or errno on failure |
| 1004 | */ |
| 1005 | |
| 1006 | int gfs2_glock_nq(struct gfs2_holder *gh) |
| 1007 | { |
| 1008 | struct gfs2_glock *gl = gh->gh_gl; |
| 1009 | struct gfs2_sbd *sdp = gl->gl_sbd; |
| 1010 | int error = 0; |
| 1011 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1012 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1013 | return -EIO; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1014 | |
Steven Whitehouse | f42ab08 | 2011-04-14 16:50:31 +0100 | [diff] [blame] | 1015 | if (test_bit(GLF_LRU, &gl->gl_flags)) |
| 1016 | gfs2_glock_remove_from_lru(gl); |
| 1017 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1018 | spin_lock(&gl->gl_spin); |
| 1019 | add_to_queue(gh); |
Bob Peterson | 01b172b | 2014-03-12 10:32:20 -0400 | [diff] [blame] | 1020 | if (unlikely((LM_FLAG_NOEXP & gh->gh_flags) && |
| 1021 | test_and_clear_bit(GLF_FROZEN, &gl->gl_flags))) { |
Steven Whitehouse | 0809f6e | 2010-08-02 10:15:17 +0100 | [diff] [blame] | 1022 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
Bob Peterson | 01b172b | 2014-03-12 10:32:20 -0400 | [diff] [blame] | 1023 | gl->gl_lockref.count++; |
| 1024 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
| 1025 | gl->gl_lockref.count--; |
| 1026 | } |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1027 | run_queue(gl, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1028 | spin_unlock(&gl->gl_spin); |
| 1029 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1030 | if (!(gh->gh_flags & GL_ASYNC)) |
| 1031 | error = gfs2_glock_wait(gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1032 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1033 | return error; |
| 1034 | } |
| 1035 | |
| 1036 | /** |
| 1037 | * gfs2_glock_poll - poll to see if an async request has been completed |
| 1038 | * @gh: the holder |
| 1039 | * |
| 1040 | * Returns: 1 if the request is ready to be gfs2_glock_wait()ed on |
| 1041 | */ |
| 1042 | |
| 1043 | int gfs2_glock_poll(struct gfs2_holder *gh) |
| 1044 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1045 | return test_bit(HIF_WAIT, &gh->gh_iflags) ? 0 : 1; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1046 | } |
| 1047 | |
| 1048 | /** |
| 1049 | * gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock) |
| 1050 | * @gh: the glock holder |
| 1051 | * |
| 1052 | */ |
| 1053 | |
| 1054 | void gfs2_glock_dq(struct gfs2_holder *gh) |
| 1055 | { |
| 1056 | struct gfs2_glock *gl = gh->gh_gl; |
Steven Whitehouse | 8fb4b53 | 2006-08-30 09:30:00 -0400 | [diff] [blame] | 1057 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 1058 | unsigned delay = 0; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1059 | int fast_path = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1060 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1061 | spin_lock(&gl->gl_spin); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1062 | if (gh->gh_flags & GL_NOCACHE) |
Steven Whitehouse | 81ffbf6 | 2013-04-10 10:26:55 +0100 | [diff] [blame] | 1063 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
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 | list_del_init(&gh->gh_list); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1066 | if (find_first_holder(gl) == NULL) { |
Steven Whitehouse | 3042a2c | 2007-11-02 08:39:34 +0000 | [diff] [blame] | 1067 | if (glops->go_unlock) { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1068 | 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] | 1069 | spin_unlock(&gl->gl_spin); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1070 | glops->go_unlock(gh); |
Steven Whitehouse | 3042a2c | 2007-11-02 08:39:34 +0000 | [diff] [blame] | 1071 | spin_lock(&gl->gl_spin); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1072 | clear_bit(GLF_LOCK, &gl->gl_flags); |
Steven Whitehouse | 3042a2c | 2007-11-02 08:39:34 +0000 | [diff] [blame] | 1073 | } |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1074 | if (list_empty(&gl->gl_holders) && |
| 1075 | !test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && |
| 1076 | !test_bit(GLF_DEMOTE, &gl->gl_flags)) |
| 1077 | fast_path = 1; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1078 | } |
Bob Peterson | 4abb6ad | 2012-08-09 12:48:43 -0500 | [diff] [blame] | 1079 | if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl)) |
| 1080 | gfs2_glock_add_to_lru(gl); |
| 1081 | |
Steven Whitehouse | 6399777 | 2009-06-12 08:49:20 +0100 | [diff] [blame] | 1082 | trace_gfs2_glock_queue(gh, 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1083 | spin_unlock(&gl->gl_spin); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1084 | if (likely(fast_path)) |
| 1085 | return; |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 1086 | |
| 1087 | gfs2_glock_hold(gl); |
| 1088 | if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) && |
Bob Peterson | 7cf8dcd | 2011-06-15 11:41:48 -0400 | [diff] [blame] | 1089 | !test_bit(GLF_DEMOTE, &gl->gl_flags) && |
| 1090 | gl->gl_name.ln_type == LM_TYPE_INODE) |
| 1091 | delay = gl->gl_hold_time; |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 1092 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) |
| 1093 | gfs2_glock_put(gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1094 | } |
| 1095 | |
Abhijith Das | d93cfa9 | 2007-06-11 08:22:32 +0100 | [diff] [blame] | 1096 | void gfs2_glock_dq_wait(struct gfs2_holder *gh) |
| 1097 | { |
| 1098 | struct gfs2_glock *gl = gh->gh_gl; |
| 1099 | gfs2_glock_dq(gh); |
Bob Peterson | 81e1d45 | 2012-08-09 12:48:45 -0500 | [diff] [blame] | 1100 | might_sleep(); |
NeilBrown | 7431620 | 2014-07-07 15:16:04 +1000 | [diff] [blame] | 1101 | wait_on_bit(&gl->gl_flags, GLF_DEMOTE, TASK_UNINTERRUPTIBLE); |
Abhijith Das | d93cfa9 | 2007-06-11 08:22:32 +0100 | [diff] [blame] | 1102 | } |
| 1103 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1104 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1105 | * gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it |
| 1106 | * @gh: the holder structure |
| 1107 | * |
| 1108 | */ |
| 1109 | |
| 1110 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh) |
| 1111 | { |
| 1112 | gfs2_glock_dq(gh); |
| 1113 | gfs2_holder_uninit(gh); |
| 1114 | } |
| 1115 | |
| 1116 | /** |
| 1117 | * gfs2_glock_nq_num - acquire a glock based on lock number |
| 1118 | * @sdp: the filesystem |
| 1119 | * @number: the lock number |
| 1120 | * @glops: the glock operations for the type of glock |
| 1121 | * @state: the state to acquire the glock in |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1122 | * @flags: modifier flags for the acquisition |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1123 | * @gh: the struct gfs2_holder |
| 1124 | * |
| 1125 | * Returns: errno |
| 1126 | */ |
| 1127 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1128 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, |
Steven Whitehouse | 8fb4b53 | 2006-08-30 09:30:00 -0400 | [diff] [blame] | 1129 | const struct gfs2_glock_operations *glops, |
| 1130 | unsigned int state, int flags, struct gfs2_holder *gh) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1131 | { |
| 1132 | struct gfs2_glock *gl; |
| 1133 | int error; |
| 1134 | |
| 1135 | error = gfs2_glock_get(sdp, number, glops, CREATE, &gl); |
| 1136 | if (!error) { |
| 1137 | error = gfs2_glock_nq_init(gl, state, flags, gh); |
| 1138 | gfs2_glock_put(gl); |
| 1139 | } |
| 1140 | |
| 1141 | return error; |
| 1142 | } |
| 1143 | |
| 1144 | /** |
| 1145 | * glock_compare - Compare two struct gfs2_glock structures for sorting |
| 1146 | * @arg_a: the first structure |
| 1147 | * @arg_b: the second structure |
| 1148 | * |
| 1149 | */ |
| 1150 | |
| 1151 | static int glock_compare(const void *arg_a, const void *arg_b) |
| 1152 | { |
Steven Whitehouse | a5e08a9 | 2006-09-09 17:07:05 -0400 | [diff] [blame] | 1153 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
| 1154 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; |
| 1155 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; |
| 1156 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1157 | |
| 1158 | if (a->ln_number > b->ln_number) |
Steven Whitehouse | a5e08a9 | 2006-09-09 17:07:05 -0400 | [diff] [blame] | 1159 | return 1; |
| 1160 | if (a->ln_number < b->ln_number) |
| 1161 | return -1; |
Steven Whitehouse | 1c0f487 | 2007-01-22 12:10:39 -0500 | [diff] [blame] | 1162 | 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] | 1163 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1164 | } |
| 1165 | |
| 1166 | /** |
| 1167 | * nq_m_sync - synchonously acquire more than one glock in deadlock free order |
| 1168 | * @num_gh: the number of structures |
| 1169 | * @ghs: an array of struct gfs2_holder structures |
| 1170 | * |
| 1171 | * Returns: 0 on success (all glocks acquired), |
| 1172 | * errno on failure (no glocks acquired) |
| 1173 | */ |
| 1174 | |
| 1175 | static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs, |
| 1176 | struct gfs2_holder **p) |
| 1177 | { |
| 1178 | unsigned int x; |
| 1179 | int error = 0; |
| 1180 | |
| 1181 | for (x = 0; x < num_gh; x++) |
| 1182 | p[x] = &ghs[x]; |
| 1183 | |
| 1184 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL); |
| 1185 | |
| 1186 | for (x = 0; x < num_gh; x++) { |
| 1187 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); |
| 1188 | |
| 1189 | error = gfs2_glock_nq(p[x]); |
| 1190 | if (error) { |
| 1191 | while (x--) |
| 1192 | gfs2_glock_dq(p[x]); |
| 1193 | break; |
| 1194 | } |
| 1195 | } |
| 1196 | |
| 1197 | return error; |
| 1198 | } |
| 1199 | |
| 1200 | /** |
| 1201 | * gfs2_glock_nq_m - acquire multiple glocks |
| 1202 | * @num_gh: the number of structures |
| 1203 | * @ghs: an array of struct gfs2_holder structures |
| 1204 | * |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1205 | * |
| 1206 | * Returns: 0 on success (all glocks acquired), |
| 1207 | * errno on failure (no glocks acquired) |
| 1208 | */ |
| 1209 | |
| 1210 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs) |
| 1211 | { |
Steven Whitehouse | eaf5bd3 | 2007-06-19 15:38:17 +0100 | [diff] [blame] | 1212 | struct gfs2_holder *tmp[4]; |
| 1213 | struct gfs2_holder **pph = tmp; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1214 | int error = 0; |
| 1215 | |
Steven Whitehouse | eaf5bd3 | 2007-06-19 15:38:17 +0100 | [diff] [blame] | 1216 | switch(num_gh) { |
| 1217 | case 0: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1218 | return 0; |
Steven Whitehouse | eaf5bd3 | 2007-06-19 15:38:17 +0100 | [diff] [blame] | 1219 | case 1: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1220 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); |
| 1221 | return gfs2_glock_nq(ghs); |
Steven Whitehouse | eaf5bd3 | 2007-06-19 15:38:17 +0100 | [diff] [blame] | 1222 | default: |
| 1223 | if (num_gh <= 4) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1224 | break; |
Steven Whitehouse | eaf5bd3 | 2007-06-19 15:38:17 +0100 | [diff] [blame] | 1225 | pph = kmalloc(num_gh * sizeof(struct gfs2_holder *), GFP_NOFS); |
| 1226 | if (!pph) |
| 1227 | return -ENOMEM; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1228 | } |
| 1229 | |
Steven Whitehouse | eaf5bd3 | 2007-06-19 15:38:17 +0100 | [diff] [blame] | 1230 | error = nq_m_sync(num_gh, ghs, pph); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1231 | |
Steven Whitehouse | eaf5bd3 | 2007-06-19 15:38:17 +0100 | [diff] [blame] | 1232 | if (pph != tmp) |
| 1233 | kfree(pph); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1234 | |
| 1235 | return error; |
| 1236 | } |
| 1237 | |
| 1238 | /** |
| 1239 | * gfs2_glock_dq_m - release multiple glocks |
| 1240 | * @num_gh: the number of structures |
| 1241 | * @ghs: an array of struct gfs2_holder structures |
| 1242 | * |
| 1243 | */ |
| 1244 | |
| 1245 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs) |
| 1246 | { |
Bob Peterson | fa1bbde | 2011-03-10 11:41:57 -0500 | [diff] [blame] | 1247 | while (num_gh--) |
| 1248 | gfs2_glock_dq(&ghs[num_gh]); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1249 | } |
| 1250 | |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1251 | void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state) |
Steven Whitehouse | da755fd | 2008-01-30 15:34:04 +0000 | [diff] [blame] | 1252 | { |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 1253 | unsigned long delay = 0; |
| 1254 | unsigned long holdtime; |
| 1255 | unsigned long now = jiffies; |
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 | gfs2_glock_hold(gl); |
Bob Peterson | 7cf8dcd | 2011-06-15 11:41:48 -0400 | [diff] [blame] | 1258 | holdtime = gl->gl_tchange + gl->gl_hold_time; |
| 1259 | if (test_bit(GLF_QUEUED, &gl->gl_flags) && |
| 1260 | gl->gl_name.ln_type == LM_TYPE_INODE) { |
Steven Whitehouse | 7b5e3d5 | 2010-09-03 09:39:20 +0100 | [diff] [blame] | 1261 | if (time_before(now, holdtime)) |
| 1262 | delay = holdtime - now; |
| 1263 | if (test_bit(GLF_REPLY_PENDING, &gl->gl_flags)) |
Bob Peterson | 7cf8dcd | 2011-06-15 11:41:48 -0400 | [diff] [blame] | 1264 | delay = gl->gl_hold_time; |
Steven Whitehouse | 7b5e3d5 | 2010-09-03 09:39:20 +0100 | [diff] [blame] | 1265 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1266 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1267 | spin_lock(&gl->gl_spin); |
Steven Whitehouse | 81ffbf6 | 2013-04-10 10:26:55 +0100 | [diff] [blame] | 1268 | handle_callback(gl, state, delay, true); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1269 | spin_unlock(&gl->gl_spin); |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 1270 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0) |
| 1271 | gfs2_glock_put(gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1272 | } |
| 1273 | |
| 1274 | /** |
Steven Whitehouse | 0809f6e | 2010-08-02 10:15:17 +0100 | [diff] [blame] | 1275 | * gfs2_should_freeze - Figure out if glock should be frozen |
| 1276 | * @gl: The glock in question |
| 1277 | * |
| 1278 | * Glocks are not frozen if (a) the result of the dlm operation is |
| 1279 | * an error, (b) the locking operation was an unlock operation or |
| 1280 | * (c) if there is a "noexp" flagged request anywhere in the queue |
| 1281 | * |
| 1282 | * Returns: 1 if freezing should occur, 0 otherwise |
| 1283 | */ |
| 1284 | |
| 1285 | static int gfs2_should_freeze(const struct gfs2_glock *gl) |
| 1286 | { |
| 1287 | const struct gfs2_holder *gh; |
| 1288 | |
| 1289 | if (gl->gl_reply & ~LM_OUT_ST_MASK) |
| 1290 | return 0; |
| 1291 | if (gl->gl_target == LM_ST_UNLOCKED) |
| 1292 | return 0; |
| 1293 | |
| 1294 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { |
| 1295 | if (test_bit(HIF_HOLDER, &gh->gh_iflags)) |
| 1296 | continue; |
| 1297 | if (LM_FLAG_NOEXP & gh->gh_flags) |
| 1298 | return 0; |
| 1299 | } |
| 1300 | |
| 1301 | return 1; |
| 1302 | } |
| 1303 | |
| 1304 | /** |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1305 | * gfs2_glock_complete - Callback used by locking |
| 1306 | * @gl: Pointer to the glock |
| 1307 | * @ret: The return value from the dlm |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1308 | * |
Steven Whitehouse | 47a2538 | 2010-11-30 15:49:31 +0000 | [diff] [blame] | 1309 | * The gl_reply field is under the gl_spin lock so that it is ok |
| 1310 | * to use a bitfield shared with other glock state fields. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1311 | */ |
| 1312 | |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1313 | void gfs2_glock_complete(struct gfs2_glock *gl, int ret) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1314 | { |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1315 | struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct; |
Steven Whitehouse | 0809f6e | 2010-08-02 10:15:17 +0100 | [diff] [blame] | 1316 | |
Steven Whitehouse | 47a2538 | 2010-11-30 15:49:31 +0000 | [diff] [blame] | 1317 | spin_lock(&gl->gl_spin); |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1318 | gl->gl_reply = ret; |
Steven Whitehouse | 0809f6e | 2010-08-02 10:15:17 +0100 | [diff] [blame] | 1319 | |
David Teigland | e0c2a9a | 2012-01-09 17:18:05 -0500 | [diff] [blame] | 1320 | if (unlikely(test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))) { |
Steven Whitehouse | 0809f6e | 2010-08-02 10:15:17 +0100 | [diff] [blame] | 1321 | if (gfs2_should_freeze(gl)) { |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1322 | set_bit(GLF_FROZEN, &gl->gl_flags); |
Steven Whitehouse | 0809f6e | 2010-08-02 10:15:17 +0100 | [diff] [blame] | 1323 | spin_unlock(&gl->gl_spin); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1324 | return; |
Steven Whitehouse | 0809f6e | 2010-08-02 10:15:17 +0100 | [diff] [blame] | 1325 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1326 | } |
Steven Whitehouse | 47a2538 | 2010-11-30 15:49:31 +0000 | [diff] [blame] | 1327 | |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 1328 | gl->gl_lockref.count++; |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1329 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 1330 | spin_unlock(&gl->gl_spin); |
| 1331 | |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1332 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
| 1333 | gfs2_glock_put(gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1334 | } |
| 1335 | |
Steven Whitehouse | 4506a51 | 2013-02-01 20:36:03 +0000 | [diff] [blame] | 1336 | static int glock_cmp(void *priv, struct list_head *a, struct list_head *b) |
| 1337 | { |
| 1338 | struct gfs2_glock *gla, *glb; |
| 1339 | |
| 1340 | gla = list_entry(a, struct gfs2_glock, gl_lru); |
| 1341 | glb = list_entry(b, struct gfs2_glock, gl_lru); |
| 1342 | |
| 1343 | if (gla->gl_name.ln_number > glb->gl_name.ln_number) |
| 1344 | return 1; |
| 1345 | if (gla->gl_name.ln_number < glb->gl_name.ln_number) |
| 1346 | return -1; |
| 1347 | |
| 1348 | return 0; |
| 1349 | } |
| 1350 | |
| 1351 | /** |
| 1352 | * gfs2_dispose_glock_lru - Demote a list of glocks |
| 1353 | * @list: The list to dispose of |
| 1354 | * |
| 1355 | * Disposing of glocks may involve disk accesses, so that here we sort |
| 1356 | * the glocks by number (i.e. disk location of the inodes) so that if |
| 1357 | * there are any such accesses, they'll be sent in order (mostly). |
| 1358 | * |
| 1359 | * Must be called under the lru_lock, but may drop and retake this |
| 1360 | * lock. While the lru_lock is dropped, entries may vanish from the |
| 1361 | * list, but no new entries will appear on the list (since it is |
| 1362 | * private) |
| 1363 | */ |
| 1364 | |
| 1365 | static void gfs2_dispose_glock_lru(struct list_head *list) |
| 1366 | __releases(&lru_lock) |
| 1367 | __acquires(&lru_lock) |
| 1368 | { |
| 1369 | struct gfs2_glock *gl; |
| 1370 | |
| 1371 | list_sort(NULL, list, glock_cmp); |
| 1372 | |
| 1373 | while(!list_empty(list)) { |
| 1374 | gl = list_entry(list->next, struct gfs2_glock, gl_lru); |
| 1375 | list_del_init(&gl->gl_lru); |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 1376 | if (!spin_trylock(&gl->gl_spin)) { |
Steven Whitehouse | 94a09a3 | 2014-06-23 14:43:32 +0100 | [diff] [blame] | 1377 | add_back_to_lru: |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 1378 | list_add(&gl->gl_lru, &lru_list); |
| 1379 | atomic_inc(&lru_count); |
| 1380 | continue; |
| 1381 | } |
Steven Whitehouse | 94a09a3 | 2014-06-23 14:43:32 +0100 | [diff] [blame] | 1382 | if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) { |
| 1383 | spin_unlock(&gl->gl_spin); |
| 1384 | goto add_back_to_lru; |
| 1385 | } |
Steven Whitehouse | 4506a51 | 2013-02-01 20:36:03 +0000 | [diff] [blame] | 1386 | clear_bit(GLF_LRU, &gl->gl_flags); |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 1387 | gl->gl_lockref.count++; |
Steven Whitehouse | 4506a51 | 2013-02-01 20:36:03 +0000 | [diff] [blame] | 1388 | if (demote_ok(gl)) |
Steven Whitehouse | 81ffbf6 | 2013-04-10 10:26:55 +0100 | [diff] [blame] | 1389 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
Steven Whitehouse | 4506a51 | 2013-02-01 20:36:03 +0000 | [diff] [blame] | 1390 | WARN_ON(!test_and_clear_bit(GLF_LOCK, &gl->gl_flags)); |
Steven Whitehouse | 4506a51 | 2013-02-01 20:36:03 +0000 | [diff] [blame] | 1391 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 1392 | gl->gl_lockref.count--; |
Steven Whitehouse | 4506a51 | 2013-02-01 20:36:03 +0000 | [diff] [blame] | 1393 | spin_unlock(&gl->gl_spin); |
Steven Whitehouse | 94a09a3 | 2014-06-23 14:43:32 +0100 | [diff] [blame] | 1394 | cond_resched_lock(&lru_lock); |
Steven Whitehouse | 4506a51 | 2013-02-01 20:36:03 +0000 | [diff] [blame] | 1395 | } |
| 1396 | } |
| 1397 | |
Steven Whitehouse | 2a00585 | 2012-12-14 12:28:30 +0000 | [diff] [blame] | 1398 | /** |
| 1399 | * gfs2_scan_glock_lru - Scan the LRU looking for locks to demote |
| 1400 | * @nr: The number of entries to scan |
| 1401 | * |
Steven Whitehouse | 4506a51 | 2013-02-01 20:36:03 +0000 | [diff] [blame] | 1402 | * This function selects the entries on the LRU which are able to |
| 1403 | * be demoted, and then kicks off the process by calling |
| 1404 | * gfs2_dispose_glock_lru() above. |
Steven Whitehouse | 2a00585 | 2012-12-14 12:28:30 +0000 | [diff] [blame] | 1405 | */ |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1406 | |
Dave Chinner | 1ab6c49 | 2013-08-28 10:18:09 +1000 | [diff] [blame] | 1407 | static long gfs2_scan_glock_lru(int nr) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1408 | { |
| 1409 | struct gfs2_glock *gl; |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1410 | LIST_HEAD(skipped); |
Steven Whitehouse | 4506a51 | 2013-02-01 20:36:03 +0000 | [diff] [blame] | 1411 | LIST_HEAD(dispose); |
Dave Chinner | 1ab6c49 | 2013-08-28 10:18:09 +1000 | [diff] [blame] | 1412 | long freed = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1413 | |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1414 | spin_lock(&lru_lock); |
Dave Chinner | 1ab6c49 | 2013-08-28 10:18:09 +1000 | [diff] [blame] | 1415 | while ((nr-- >= 0) && !list_empty(&lru_list)) { |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1416 | gl = list_entry(lru_list.next, struct gfs2_glock, gl_lru); |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1417 | |
| 1418 | /* Test for being demotable */ |
Steven Whitehouse | 94a09a3 | 2014-06-23 14:43:32 +0100 | [diff] [blame] | 1419 | if (!test_bit(GLF_LOCK, &gl->gl_flags)) { |
Steven Whitehouse | 4506a51 | 2013-02-01 20:36:03 +0000 | [diff] [blame] | 1420 | list_move(&gl->gl_lru, &dispose); |
| 1421 | atomic_dec(&lru_count); |
Dave Chinner | 1ab6c49 | 2013-08-28 10:18:09 +1000 | [diff] [blame] | 1422 | freed++; |
Steven Whitehouse | 2163b1e | 2009-06-25 16:30:26 +0100 | [diff] [blame] | 1423 | continue; |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1424 | } |
Steven Whitehouse | 4506a51 | 2013-02-01 20:36:03 +0000 | [diff] [blame] | 1425 | |
| 1426 | list_move(&gl->gl_lru, &skipped); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1427 | } |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1428 | list_splice(&skipped, &lru_list); |
Steven Whitehouse | 4506a51 | 2013-02-01 20:36:03 +0000 | [diff] [blame] | 1429 | if (!list_empty(&dispose)) |
| 1430 | gfs2_dispose_glock_lru(&dispose); |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1431 | spin_unlock(&lru_lock); |
Dave Chinner | 1ab6c49 | 2013-08-28 10:18:09 +1000 | [diff] [blame] | 1432 | |
| 1433 | return freed; |
Steven Whitehouse | 2a00585 | 2012-12-14 12:28:30 +0000 | [diff] [blame] | 1434 | } |
| 1435 | |
Dave Chinner | 1ab6c49 | 2013-08-28 10:18:09 +1000 | [diff] [blame] | 1436 | static unsigned long gfs2_glock_shrink_scan(struct shrinker *shrink, |
| 1437 | struct shrink_control *sc) |
Steven Whitehouse | 2a00585 | 2012-12-14 12:28:30 +0000 | [diff] [blame] | 1438 | { |
Dave Chinner | 1ab6c49 | 2013-08-28 10:18:09 +1000 | [diff] [blame] | 1439 | if (!(sc->gfp_mask & __GFP_FS)) |
| 1440 | return SHRINK_STOP; |
| 1441 | return gfs2_scan_glock_lru(sc->nr_to_scan); |
| 1442 | } |
Steven Whitehouse | 2a00585 | 2012-12-14 12:28:30 +0000 | [diff] [blame] | 1443 | |
Dave Chinner | 1ab6c49 | 2013-08-28 10:18:09 +1000 | [diff] [blame] | 1444 | static unsigned long gfs2_glock_shrink_count(struct shrinker *shrink, |
| 1445 | struct shrink_control *sc) |
| 1446 | { |
Glauber Costa | 55f841c | 2013-08-28 10:17:53 +1000 | [diff] [blame] | 1447 | return vfs_pressure_ratio(atomic_read(&lru_count)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1448 | } |
| 1449 | |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1450 | static struct shrinker glock_shrinker = { |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1451 | .seeks = DEFAULT_SEEKS, |
Dave Chinner | 1ab6c49 | 2013-08-28 10:18:09 +1000 | [diff] [blame] | 1452 | .count_objects = gfs2_glock_shrink_count, |
| 1453 | .scan_objects = gfs2_glock_shrink_scan, |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1454 | }; |
| 1455 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1456 | /** |
| 1457 | * examine_bucket - Call a function for glock in a hash bucket |
| 1458 | * @examiner: the function |
| 1459 | * @sdp: the filesystem |
| 1460 | * @bucket: the bucket |
| 1461 | * |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1462 | */ |
| 1463 | |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1464 | static void examine_bucket(glock_examiner examiner, const struct gfs2_sbd *sdp, |
Steven Whitehouse | 37b2fa6 | 2006-09-08 13:35:56 -0400 | [diff] [blame] | 1465 | unsigned int hash) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1466 | { |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1467 | struct gfs2_glock *gl; |
| 1468 | struct hlist_bl_head *head = &gl_hash_table[hash]; |
| 1469 | struct hlist_bl_node *pos; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1470 | |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1471 | rcu_read_lock(); |
| 1472 | hlist_bl_for_each_entry_rcu(gl, pos, head, gl_list) { |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 1473 | if ((gl->gl_sbd == sdp) && lockref_get_not_dead(&gl->gl_lockref)) |
Steven Whitehouse | 2426443 | 2006-09-11 21:40:30 -0400 | [diff] [blame] | 1474 | examiner(gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1475 | } |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1476 | rcu_read_unlock(); |
Steven Whitehouse | 8fbbfd2 | 2007-08-01 13:57:10 +0100 | [diff] [blame] | 1477 | cond_resched(); |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1478 | } |
| 1479 | |
| 1480 | static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp) |
| 1481 | { |
| 1482 | unsigned x; |
| 1483 | |
| 1484 | for (x = 0; x < GFS2_GL_HASH_SIZE; x++) |
| 1485 | examine_bucket(examiner, sdp, x); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1486 | } |
| 1487 | |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1488 | |
| 1489 | /** |
| 1490 | * thaw_glock - thaw out a glock which has an unprocessed reply waiting |
| 1491 | * @gl: The glock to thaw |
| 1492 | * |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1493 | */ |
| 1494 | |
| 1495 | static void thaw_glock(struct gfs2_glock *gl) |
| 1496 | { |
| 1497 | if (!test_and_clear_bit(GLF_FROZEN, &gl->gl_flags)) |
Steven Whitehouse | 7286b31 | 2013-08-20 09:35:09 +0100 | [diff] [blame] | 1498 | goto out; |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1499 | set_bit(GLF_REPLY_PENDING, &gl->gl_flags); |
Steven Whitehouse | 7286b31 | 2013-08-20 09:35:09 +0100 | [diff] [blame] | 1500 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) { |
| 1501 | out: |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1502 | gfs2_glock_put(gl); |
Steven Whitehouse | 7286b31 | 2013-08-20 09:35:09 +0100 | [diff] [blame] | 1503 | } |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1504 | } |
| 1505 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1506 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1507 | * clear_glock - look at a glock and see if we can free it from glock cache |
| 1508 | * @gl: the glock to look at |
| 1509 | * |
| 1510 | */ |
| 1511 | |
| 1512 | static void clear_glock(struct gfs2_glock *gl) |
| 1513 | { |
Steven Whitehouse | f42ab08 | 2011-04-14 16:50:31 +0100 | [diff] [blame] | 1514 | gfs2_glock_remove_from_lru(gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1515 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1516 | spin_lock(&gl->gl_spin); |
Steven Whitehouse | c741c45 | 2010-09-29 14:20:52 +0100 | [diff] [blame] | 1517 | if (gl->gl_state != LM_ST_UNLOCKED) |
Steven Whitehouse | 81ffbf6 | 2013-04-10 10:26:55 +0100 | [diff] [blame] | 1518 | handle_callback(gl, LM_ST_UNLOCKED, 0, false); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1519 | spin_unlock(&gl->gl_spin); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1520 | if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) |
| 1521 | gfs2_glock_put(gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1522 | } |
| 1523 | |
| 1524 | /** |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1525 | * gfs2_glock_thaw - Thaw any frozen glocks |
| 1526 | * @sdp: The super block |
| 1527 | * |
| 1528 | */ |
| 1529 | |
| 1530 | void gfs2_glock_thaw(struct gfs2_sbd *sdp) |
| 1531 | { |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1532 | glock_hash_walk(thaw_glock, sdp); |
| 1533 | } |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1534 | |
Steven Whitehouse | ac3beb6 | 2014-01-16 10:31:13 +0000 | [diff] [blame] | 1535 | static void dump_glock(struct seq_file *seq, struct gfs2_glock *gl) |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1536 | { |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1537 | spin_lock(&gl->gl_spin); |
Steven Whitehouse | ac3beb6 | 2014-01-16 10:31:13 +0000 | [diff] [blame] | 1538 | gfs2_dump_glock(seq, gl); |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1539 | spin_unlock(&gl->gl_spin); |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1540 | } |
| 1541 | |
| 1542 | static void dump_glock_func(struct gfs2_glock *gl) |
| 1543 | { |
| 1544 | dump_glock(NULL, gl); |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1545 | } |
| 1546 | |
| 1547 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1548 | * gfs2_gl_hash_clear - Empty out the glock hash table |
| 1549 | * @sdp: the filesystem |
| 1550 | * @wait: wait until it's all gone |
| 1551 | * |
Steven Whitehouse | 1bdad60 | 2008-06-03 14:09:53 +0100 | [diff] [blame] | 1552 | * Called when unmounting the filesystem. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1553 | */ |
| 1554 | |
Steven Whitehouse | fefc03b | 2008-12-19 15:32:06 +0000 | [diff] [blame] | 1555 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1556 | { |
David Teigland | fb6791d | 2012-11-13 10:58:56 -0500 | [diff] [blame] | 1557 | set_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags); |
Bob Peterson | 222cb53 | 2013-04-25 12:49:17 -0400 | [diff] [blame] | 1558 | flush_workqueue(glock_workqueue); |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1559 | glock_hash_walk(clear_glock, sdp); |
Steven Whitehouse | 8f05228 | 2010-01-29 15:21:27 +0000 | [diff] [blame] | 1560 | flush_workqueue(glock_workqueue); |
| 1561 | wait_event(sdp->sd_glock_wait, atomic_read(&sdp->sd_glock_disposal) == 0); |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1562 | glock_hash_walk(dump_glock_func, sdp); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1563 | } |
| 1564 | |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 1565 | void gfs2_glock_finish_truncate(struct gfs2_inode *ip) |
| 1566 | { |
| 1567 | struct gfs2_glock *gl = ip->i_gl; |
| 1568 | int ret; |
| 1569 | |
| 1570 | ret = gfs2_truncatei_resume(ip); |
| 1571 | gfs2_assert_withdraw(gl->gl_sbd, ret == 0); |
| 1572 | |
| 1573 | spin_lock(&gl->gl_spin); |
| 1574 | clear_bit(GLF_LOCK, &gl->gl_flags); |
| 1575 | run_queue(gl, 1); |
| 1576 | spin_unlock(&gl->gl_spin); |
| 1577 | } |
| 1578 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1579 | static const char *state2str(unsigned state) |
Robert Peterson | 04b933f | 2007-03-23 17:05:15 -0500 | [diff] [blame] | 1580 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1581 | switch(state) { |
| 1582 | case LM_ST_UNLOCKED: |
| 1583 | return "UN"; |
| 1584 | case LM_ST_SHARED: |
| 1585 | return "SH"; |
| 1586 | case LM_ST_DEFERRED: |
| 1587 | return "DF"; |
| 1588 | case LM_ST_EXCLUSIVE: |
| 1589 | return "EX"; |
| 1590 | } |
| 1591 | return "??"; |
| 1592 | } |
Robert Peterson | 04b933f | 2007-03-23 17:05:15 -0500 | [diff] [blame] | 1593 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1594 | static const char *hflags2str(char *buf, unsigned flags, unsigned long iflags) |
| 1595 | { |
| 1596 | char *p = buf; |
| 1597 | if (flags & LM_FLAG_TRY) |
| 1598 | *p++ = 't'; |
| 1599 | if (flags & LM_FLAG_TRY_1CB) |
| 1600 | *p++ = 'T'; |
| 1601 | if (flags & LM_FLAG_NOEXP) |
| 1602 | *p++ = 'e'; |
| 1603 | if (flags & LM_FLAG_ANY) |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1604 | *p++ = 'A'; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1605 | if (flags & LM_FLAG_PRIORITY) |
| 1606 | *p++ = 'p'; |
| 1607 | if (flags & GL_ASYNC) |
| 1608 | *p++ = 'a'; |
| 1609 | if (flags & GL_EXACT) |
| 1610 | *p++ = 'E'; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1611 | if (flags & GL_NOCACHE) |
| 1612 | *p++ = 'c'; |
| 1613 | if (test_bit(HIF_HOLDER, &iflags)) |
| 1614 | *p++ = 'H'; |
| 1615 | if (test_bit(HIF_WAIT, &iflags)) |
| 1616 | *p++ = 'W'; |
| 1617 | if (test_bit(HIF_FIRST, &iflags)) |
| 1618 | *p++ = 'F'; |
| 1619 | *p = 0; |
| 1620 | return buf; |
Robert Peterson | 04b933f | 2007-03-23 17:05:15 -0500 | [diff] [blame] | 1621 | } |
| 1622 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1623 | /** |
| 1624 | * dump_holder - print information about a glock holder |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1625 | * @seq: the seq_file struct |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1626 | * @gh: the glock holder |
| 1627 | * |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1628 | */ |
| 1629 | |
Steven Whitehouse | ac3beb6 | 2014-01-16 10:31:13 +0000 | [diff] [blame] | 1630 | static void dump_holder(struct seq_file *seq, const struct gfs2_holder *gh) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1631 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1632 | struct task_struct *gh_owner = NULL; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1633 | char flags_buf[32]; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1634 | |
Tetsuo Handa | 0b3a2c9 | 2014-01-02 19:52:20 +0900 | [diff] [blame] | 1635 | rcu_read_lock(); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1636 | if (gh->gh_owner_pid) |
Pavel Emelyanov | b1e058d | 2008-02-07 00:13:19 -0800 | [diff] [blame] | 1637 | gh_owner = pid_task(gh->gh_owner_pid, PIDTYPE_PID); |
Joe Perches | cc18152 | 2010-11-05 16:12:36 -0700 | [diff] [blame] | 1638 | gfs2_print_dbg(seq, " H: s:%s f:%s e:%d p:%ld [%s] %pS\n", |
| 1639 | state2str(gh->gh_state), |
| 1640 | hflags2str(flags_buf, gh->gh_flags, gh->gh_iflags), |
| 1641 | gh->gh_error, |
| 1642 | gh->gh_owner_pid ? (long)pid_nr(gh->gh_owner_pid) : -1, |
| 1643 | gh_owner ? gh_owner->comm : "(ended)", |
| 1644 | (void *)gh->gh_ip); |
Tetsuo Handa | 0b3a2c9 | 2014-01-02 19:52:20 +0900 | [diff] [blame] | 1645 | rcu_read_unlock(); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1646 | } |
| 1647 | |
Steven Whitehouse | 627c10b | 2011-04-14 14:09:52 +0100 | [diff] [blame] | 1648 | static const char *gflags2str(char *buf, const struct gfs2_glock *gl) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1649 | { |
Steven Whitehouse | 627c10b | 2011-04-14 14:09:52 +0100 | [diff] [blame] | 1650 | const unsigned long *gflags = &gl->gl_flags; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1651 | char *p = buf; |
Steven Whitehouse | 627c10b | 2011-04-14 14:09:52 +0100 | [diff] [blame] | 1652 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1653 | if (test_bit(GLF_LOCK, gflags)) |
| 1654 | *p++ = 'l'; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1655 | if (test_bit(GLF_DEMOTE, gflags)) |
| 1656 | *p++ = 'D'; |
| 1657 | if (test_bit(GLF_PENDING_DEMOTE, gflags)) |
| 1658 | *p++ = 'd'; |
| 1659 | if (test_bit(GLF_DEMOTE_IN_PROGRESS, gflags)) |
| 1660 | *p++ = 'p'; |
| 1661 | if (test_bit(GLF_DIRTY, gflags)) |
| 1662 | *p++ = 'y'; |
| 1663 | if (test_bit(GLF_LFLUSH, gflags)) |
| 1664 | *p++ = 'f'; |
| 1665 | if (test_bit(GLF_INVALIDATE_IN_PROGRESS, gflags)) |
| 1666 | *p++ = 'i'; |
| 1667 | if (test_bit(GLF_REPLY_PENDING, gflags)) |
| 1668 | *p++ = 'r'; |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1669 | if (test_bit(GLF_INITIAL, gflags)) |
Steven Whitehouse | d8348de | 2009-02-05 10:12:38 +0000 | [diff] [blame] | 1670 | *p++ = 'I'; |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1671 | if (test_bit(GLF_FROZEN, gflags)) |
| 1672 | *p++ = 'F'; |
Steven Whitehouse | 7b5e3d5 | 2010-09-03 09:39:20 +0100 | [diff] [blame] | 1673 | if (test_bit(GLF_QUEUED, gflags)) |
| 1674 | *p++ = 'q'; |
Steven Whitehouse | 627c10b | 2011-04-14 14:09:52 +0100 | [diff] [blame] | 1675 | if (test_bit(GLF_LRU, gflags)) |
| 1676 | *p++ = 'L'; |
| 1677 | if (gl->gl_object) |
| 1678 | *p++ = 'o'; |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 1679 | if (test_bit(GLF_BLOCKING, gflags)) |
| 1680 | *p++ = 'b'; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1681 | *p = 0; |
| 1682 | return buf; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1683 | } |
| 1684 | |
| 1685 | /** |
Steven Whitehouse | 8eae1ca | 2012-10-15 10:57:02 +0100 | [diff] [blame] | 1686 | * gfs2_dump_glock - print information about a glock |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1687 | * @seq: The seq_file struct |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1688 | * @gl: the glock |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1689 | * |
| 1690 | * The file format is as follows: |
| 1691 | * One line per object, capital letters are used to indicate objects |
| 1692 | * G = glock, I = Inode, R = rgrp, H = holder. Glocks are not indented, |
| 1693 | * other objects are indented by a single space and follow the glock to |
| 1694 | * which they are related. Fields are indicated by lower case letters |
| 1695 | * followed by a colon and the field value, except for strings which are in |
| 1696 | * [] so that its possible to see if they are composed of spaces for |
| 1697 | * example. The field's are n = number (id of the object), f = flags, |
| 1698 | * t = type, s = state, r = refcount, e = error, p = pid. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1699 | * |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1700 | */ |
| 1701 | |
Steven Whitehouse | ac3beb6 | 2014-01-16 10:31:13 +0000 | [diff] [blame] | 1702 | void gfs2_dump_glock(struct seq_file *seq, const struct gfs2_glock *gl) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1703 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1704 | const struct gfs2_glock_operations *glops = gl->gl_ops; |
| 1705 | unsigned long long dtime; |
| 1706 | const struct gfs2_holder *gh; |
| 1707 | char gflags_buf[32]; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1708 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1709 | dtime = jiffies - gl->gl_demote_time; |
| 1710 | dtime *= 1000000/HZ; /* demote time in uSec */ |
| 1711 | if (!test_bit(GLF_DEMOTE, &gl->gl_flags)) |
| 1712 | dtime = 0; |
Bob Peterson | 7cf8dcd | 2011-06-15 11:41:48 -0400 | [diff] [blame] | 1713 | gfs2_print_dbg(seq, "G: s:%s n:%u/%llx f:%s t:%s d:%s/%llu a:%d v:%d r:%d m:%ld\n", |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1714 | state2str(gl->gl_state), |
| 1715 | gl->gl_name.ln_type, |
| 1716 | (unsigned long long)gl->gl_name.ln_number, |
Steven Whitehouse | 627c10b | 2011-04-14 14:09:52 +0100 | [diff] [blame] | 1717 | gflags2str(gflags_buf, gl), |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1718 | state2str(gl->gl_target), |
| 1719 | state2str(gl->gl_demote_state), dtime, |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1720 | atomic_read(&gl->gl_ail_count), |
Steven Whitehouse | f42ab08 | 2011-04-14 16:50:31 +0100 | [diff] [blame] | 1721 | atomic_read(&gl->gl_revokes), |
Steven Whitehouse | e66cf16 | 2013-10-15 15:18:08 +0100 | [diff] [blame] | 1722 | (int)gl->gl_lockref.count, gl->gl_hold_time); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1723 | |
Steven Whitehouse | ac3beb6 | 2014-01-16 10:31:13 +0000 | [diff] [blame] | 1724 | list_for_each_entry(gh, &gl->gl_holders, gh_list) |
| 1725 | dump_holder(seq, gh); |
| 1726 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1727 | if (gl->gl_state != LM_ST_UNLOCKED && glops->go_dump) |
Steven Whitehouse | ac3beb6 | 2014-01-16 10:31:13 +0000 | [diff] [blame] | 1728 | glops->go_dump(seq, gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1729 | } |
| 1730 | |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 1731 | static int gfs2_glstats_seq_show(struct seq_file *seq, void *iter_ptr) |
| 1732 | { |
| 1733 | struct gfs2_glock *gl = iter_ptr; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1734 | |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 1735 | seq_printf(seq, "G: n:%u/%llx rtt:%lld/%lld rttb:%lld/%lld irt:%lld/%lld dcnt: %lld qcnt: %lld\n", |
| 1736 | gl->gl_name.ln_type, |
| 1737 | (unsigned long long)gl->gl_name.ln_number, |
| 1738 | (long long)gl->gl_stats.stats[GFS2_LKS_SRTT], |
| 1739 | (long long)gl->gl_stats.stats[GFS2_LKS_SRTTVAR], |
| 1740 | (long long)gl->gl_stats.stats[GFS2_LKS_SRTTB], |
| 1741 | (long long)gl->gl_stats.stats[GFS2_LKS_SRTTVARB], |
| 1742 | (long long)gl->gl_stats.stats[GFS2_LKS_SIRT], |
| 1743 | (long long)gl->gl_stats.stats[GFS2_LKS_SIRTVAR], |
| 1744 | (long long)gl->gl_stats.stats[GFS2_LKS_DCOUNT], |
| 1745 | (long long)gl->gl_stats.stats[GFS2_LKS_QCOUNT]); |
| 1746 | return 0; |
| 1747 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1748 | |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 1749 | static const char *gfs2_gltype[] = { |
| 1750 | "type", |
| 1751 | "reserved", |
| 1752 | "nondisk", |
| 1753 | "inode", |
| 1754 | "rgrp", |
| 1755 | "meta", |
| 1756 | "iopen", |
| 1757 | "flock", |
| 1758 | "plock", |
| 1759 | "quota", |
| 1760 | "journal", |
| 1761 | }; |
| 1762 | |
| 1763 | static const char *gfs2_stype[] = { |
| 1764 | [GFS2_LKS_SRTT] = "srtt", |
| 1765 | [GFS2_LKS_SRTTVAR] = "srttvar", |
| 1766 | [GFS2_LKS_SRTTB] = "srttb", |
| 1767 | [GFS2_LKS_SRTTVARB] = "srttvarb", |
| 1768 | [GFS2_LKS_SIRT] = "sirt", |
| 1769 | [GFS2_LKS_SIRTVAR] = "sirtvar", |
| 1770 | [GFS2_LKS_DCOUNT] = "dlm", |
| 1771 | [GFS2_LKS_QCOUNT] = "queue", |
| 1772 | }; |
| 1773 | |
| 1774 | #define GFS2_NR_SBSTATS (ARRAY_SIZE(gfs2_gltype) * ARRAY_SIZE(gfs2_stype)) |
| 1775 | |
| 1776 | static int gfs2_sbstats_seq_show(struct seq_file *seq, void *iter_ptr) |
| 1777 | { |
| 1778 | struct gfs2_glock_iter *gi = seq->private; |
| 1779 | struct gfs2_sbd *sdp = gi->sdp; |
| 1780 | unsigned index = gi->hash >> 3; |
| 1781 | unsigned subindex = gi->hash & 0x07; |
| 1782 | s64 value; |
| 1783 | int i; |
| 1784 | |
| 1785 | if (index == 0 && subindex != 0) |
| 1786 | return 0; |
| 1787 | |
| 1788 | seq_printf(seq, "%-10s %8s:", gfs2_gltype[index], |
| 1789 | (index == 0) ? "cpu": gfs2_stype[subindex]); |
| 1790 | |
| 1791 | for_each_possible_cpu(i) { |
| 1792 | const struct gfs2_pcpu_lkstats *lkstats = per_cpu_ptr(sdp->sd_lkstats, i); |
| 1793 | if (index == 0) { |
| 1794 | value = i; |
| 1795 | } else { |
| 1796 | value = lkstats->lkstats[index - 1].stats[subindex]; |
| 1797 | } |
| 1798 | seq_printf(seq, " %15lld", (long long)value); |
| 1799 | } |
| 1800 | seq_putc(seq, '\n'); |
| 1801 | return 0; |
| 1802 | } |
Steven Whitehouse | 8fbbfd2 | 2007-08-01 13:57:10 +0100 | [diff] [blame] | 1803 | |
Steven Whitehouse | 85d1da6 | 2006-09-07 14:40:21 -0400 | [diff] [blame] | 1804 | int __init gfs2_glock_init(void) |
| 1805 | { |
| 1806 | unsigned i; |
| 1807 | for(i = 0; i < GFS2_GL_HASH_SIZE; i++) { |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1808 | INIT_HLIST_BL_HEAD(&gl_hash_table[i]); |
Steven Whitehouse | 85d1da6 | 2006-09-07 14:40:21 -0400 | [diff] [blame] | 1809 | } |
Steven Whitehouse | 8fbbfd2 | 2007-08-01 13:57:10 +0100 | [diff] [blame] | 1810 | |
Steven Whitehouse | d211577 | 2010-11-03 19:58:53 +0000 | [diff] [blame] | 1811 | glock_workqueue = alloc_workqueue("glock_workqueue", WQ_MEM_RECLAIM | |
Tejun Heo | 58a69cb | 2011-02-16 09:25:31 +0100 | [diff] [blame] | 1812 | WQ_HIGHPRI | WQ_FREEZABLE, 0); |
Dan Carpenter | dfc4616 | 2013-08-15 10:54:43 +0300 | [diff] [blame] | 1813 | if (!glock_workqueue) |
| 1814 | return -ENOMEM; |
Steven Whitehouse | d211577 | 2010-11-03 19:58:53 +0000 | [diff] [blame] | 1815 | gfs2_delete_workqueue = alloc_workqueue("delete_workqueue", |
Tejun Heo | 58a69cb | 2011-02-16 09:25:31 +0100 | [diff] [blame] | 1816 | WQ_MEM_RECLAIM | WQ_FREEZABLE, |
Steven Whitehouse | d211577 | 2010-11-03 19:58:53 +0000 | [diff] [blame] | 1817 | 0); |
Dan Carpenter | dfc4616 | 2013-08-15 10:54:43 +0300 | [diff] [blame] | 1818 | if (!gfs2_delete_workqueue) { |
Benjamin Marzinski | b94a170 | 2009-07-23 18:52:34 -0500 | [diff] [blame] | 1819 | destroy_workqueue(glock_workqueue); |
Dan Carpenter | dfc4616 | 2013-08-15 10:54:43 +0300 | [diff] [blame] | 1820 | return -ENOMEM; |
Benjamin Marzinski | b94a170 | 2009-07-23 18:52:34 -0500 | [diff] [blame] | 1821 | } |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1822 | |
| 1823 | register_shrinker(&glock_shrinker); |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 1824 | |
Steven Whitehouse | 85d1da6 | 2006-09-07 14:40:21 -0400 | [diff] [blame] | 1825 | return 0; |
| 1826 | } |
| 1827 | |
Steven Whitehouse | 8fbbfd2 | 2007-08-01 13:57:10 +0100 | [diff] [blame] | 1828 | void gfs2_glock_exit(void) |
| 1829 | { |
Steven Whitehouse | 97cc102 | 2008-11-20 13:39:47 +0000 | [diff] [blame] | 1830 | unregister_shrinker(&glock_shrinker); |
Benjamin Marzinski | c4f68a1 | 2007-08-23 13:19:05 -0500 | [diff] [blame] | 1831 | destroy_workqueue(glock_workqueue); |
Benjamin Marzinski | b94a170 | 2009-07-23 18:52:34 -0500 | [diff] [blame] | 1832 | destroy_workqueue(gfs2_delete_workqueue); |
Steven Whitehouse | 8fbbfd2 | 2007-08-01 13:57:10 +0100 | [diff] [blame] | 1833 | } |
| 1834 | |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1835 | static inline struct gfs2_glock *glock_hash_chain(unsigned hash) |
| 1836 | { |
| 1837 | return hlist_bl_entry(hlist_bl_first_rcu(&gl_hash_table[hash]), |
| 1838 | struct gfs2_glock, gl_list); |
| 1839 | } |
| 1840 | |
| 1841 | static inline struct gfs2_glock *glock_hash_next(struct gfs2_glock *gl) |
| 1842 | { |
Steven Whitehouse | 7e32d02 | 2011-03-15 08:32:14 +0000 | [diff] [blame] | 1843 | return hlist_bl_entry(rcu_dereference(gl->gl_list.next), |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1844 | struct gfs2_glock, gl_list); |
| 1845 | } |
| 1846 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1847 | static int gfs2_glock_iter_next(struct gfs2_glock_iter *gi) |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1848 | { |
Steven Whitehouse | 7b08fc6 | 2007-07-24 13:53:36 +0100 | [diff] [blame] | 1849 | struct gfs2_glock *gl; |
| 1850 | |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1851 | do { |
| 1852 | gl = gi->gl; |
| 1853 | if (gl) { |
| 1854 | gi->gl = glock_hash_next(gl); |
Steven Whitehouse | ba1ddcb | 2012-06-08 11:16:22 +0100 | [diff] [blame] | 1855 | gi->nhash++; |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1856 | } else { |
Steven Whitehouse | ba1ddcb | 2012-06-08 11:16:22 +0100 | [diff] [blame] | 1857 | if (gi->hash >= GFS2_GL_HASH_SIZE) { |
| 1858 | rcu_read_unlock(); |
| 1859 | return 1; |
| 1860 | } |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1861 | gi->gl = glock_hash_chain(gi->hash); |
Steven Whitehouse | ba1ddcb | 2012-06-08 11:16:22 +0100 | [diff] [blame] | 1862 | gi->nhash = 0; |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1863 | } |
| 1864 | while (gi->gl == NULL) { |
| 1865 | gi->hash++; |
| 1866 | if (gi->hash >= GFS2_GL_HASH_SIZE) { |
| 1867 | rcu_read_unlock(); |
| 1868 | return 1; |
| 1869 | } |
| 1870 | gi->gl = glock_hash_chain(gi->hash); |
Steven Whitehouse | ba1ddcb | 2012-06-08 11:16:22 +0100 | [diff] [blame] | 1871 | gi->nhash = 0; |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1872 | } |
| 1873 | /* Skip entries for other sb and dead entries */ |
Michal Nazarewicz | e3c4269 | 2013-11-12 13:30:05 +0100 | [diff] [blame] | 1874 | } while (gi->sdp != gi->gl->gl_sbd || |
| 1875 | __lockref_is_dead(&gi->gl->gl_lockref)); |
Abhijith Das | a947e03 | 2007-08-21 09:57:29 -0500 | [diff] [blame] | 1876 | |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1877 | return 0; |
| 1878 | } |
| 1879 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1880 | 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] | 1881 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1882 | struct gfs2_glock_iter *gi = seq->private; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1883 | loff_t n = *pos; |
| 1884 | |
Steven Whitehouse | ba1ddcb | 2012-06-08 11:16:22 +0100 | [diff] [blame] | 1885 | if (gi->last_pos <= *pos) |
| 1886 | n = gi->nhash + (*pos - gi->last_pos); |
| 1887 | else |
| 1888 | gi->hash = 0; |
| 1889 | |
| 1890 | gi->nhash = 0; |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1891 | rcu_read_lock(); |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1892 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1893 | do { |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1894 | if (gfs2_glock_iter_next(gi)) |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1895 | return NULL; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1896 | } while (n--); |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1897 | |
Steven Whitehouse | ba1ddcb | 2012-06-08 11:16:22 +0100 | [diff] [blame] | 1898 | gi->last_pos = *pos; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1899 | return gi->gl; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1900 | } |
| 1901 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1902 | 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] | 1903 | loff_t *pos) |
| 1904 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1905 | struct gfs2_glock_iter *gi = seq->private; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1906 | |
| 1907 | (*pos)++; |
Steven Whitehouse | ba1ddcb | 2012-06-08 11:16:22 +0100 | [diff] [blame] | 1908 | gi->last_pos = *pos; |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1909 | if (gfs2_glock_iter_next(gi)) |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1910 | return NULL; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1911 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1912 | return gi->gl; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1913 | } |
| 1914 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1915 | 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] | 1916 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1917 | struct gfs2_glock_iter *gi = seq->private; |
Steven Whitehouse | bc015cb | 2011-01-19 09:30:01 +0000 | [diff] [blame] | 1918 | |
| 1919 | if (gi->gl) |
| 1920 | rcu_read_unlock(); |
| 1921 | gi->gl = NULL; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1922 | } |
| 1923 | |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1924 | 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] | 1925 | { |
Steven Whitehouse | ac3beb6 | 2014-01-16 10:31:13 +0000 | [diff] [blame] | 1926 | dump_glock(seq, iter_ptr); |
| 1927 | return 0; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1928 | } |
| 1929 | |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 1930 | static void *gfs2_sbstats_seq_start(struct seq_file *seq, loff_t *pos) |
| 1931 | { |
| 1932 | struct gfs2_glock_iter *gi = seq->private; |
| 1933 | |
| 1934 | gi->hash = *pos; |
| 1935 | if (*pos >= GFS2_NR_SBSTATS) |
| 1936 | return NULL; |
| 1937 | preempt_disable(); |
| 1938 | return SEQ_START_TOKEN; |
| 1939 | } |
| 1940 | |
| 1941 | static void *gfs2_sbstats_seq_next(struct seq_file *seq, void *iter_ptr, |
| 1942 | loff_t *pos) |
| 1943 | { |
| 1944 | struct gfs2_glock_iter *gi = seq->private; |
| 1945 | (*pos)++; |
| 1946 | gi->hash++; |
| 1947 | if (gi->hash >= GFS2_NR_SBSTATS) { |
| 1948 | preempt_enable(); |
| 1949 | return NULL; |
| 1950 | } |
| 1951 | return SEQ_START_TOKEN; |
| 1952 | } |
| 1953 | |
| 1954 | static void gfs2_sbstats_seq_stop(struct seq_file *seq, void *iter_ptr) |
| 1955 | { |
| 1956 | preempt_enable(); |
| 1957 | } |
| 1958 | |
Denis Cheng | 4ef2900 | 2007-07-31 18:31:11 +0800 | [diff] [blame] | 1959 | static const struct seq_operations gfs2_glock_seq_ops = { |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1960 | .start = gfs2_glock_seq_start, |
| 1961 | .next = gfs2_glock_seq_next, |
| 1962 | .stop = gfs2_glock_seq_stop, |
| 1963 | .show = gfs2_glock_seq_show, |
| 1964 | }; |
| 1965 | |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 1966 | static const struct seq_operations gfs2_glstats_seq_ops = { |
| 1967 | .start = gfs2_glock_seq_start, |
| 1968 | .next = gfs2_glock_seq_next, |
| 1969 | .stop = gfs2_glock_seq_stop, |
| 1970 | .show = gfs2_glstats_seq_show, |
| 1971 | }; |
| 1972 | |
| 1973 | static const struct seq_operations gfs2_sbstats_seq_ops = { |
| 1974 | .start = gfs2_sbstats_seq_start, |
| 1975 | .next = gfs2_sbstats_seq_next, |
| 1976 | .stop = gfs2_sbstats_seq_stop, |
| 1977 | .show = gfs2_sbstats_seq_show, |
| 1978 | }; |
| 1979 | |
Steven Whitehouse | 0fe2f1e | 2012-06-11 13:49:47 +0100 | [diff] [blame] | 1980 | #define GFS2_SEQ_GOODSIZE min(PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER, 65536UL) |
| 1981 | |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 1982 | static int gfs2_glocks_open(struct inode *inode, struct file *file) |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1983 | { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1984 | int ret = seq_open_private(file, &gfs2_glock_seq_ops, |
| 1985 | sizeof(struct gfs2_glock_iter)); |
| 1986 | if (ret == 0) { |
| 1987 | struct seq_file *seq = file->private_data; |
| 1988 | struct gfs2_glock_iter *gi = seq->private; |
| 1989 | gi->sdp = inode->i_private; |
Steven Whitehouse | 0fe2f1e | 2012-06-11 13:49:47 +0100 | [diff] [blame] | 1990 | seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN); |
Steven Whitehouse | df5d2f5 | 2012-06-07 13:30:16 +0100 | [diff] [blame] | 1991 | if (seq->buf) |
Steven Whitehouse | 0fe2f1e | 2012-06-11 13:49:47 +0100 | [diff] [blame] | 1992 | seq->size = GFS2_SEQ_GOODSIZE; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 1993 | } |
| 1994 | return ret; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 1995 | } |
| 1996 | |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 1997 | static int gfs2_glstats_open(struct inode *inode, struct file *file) |
| 1998 | { |
| 1999 | int ret = seq_open_private(file, &gfs2_glstats_seq_ops, |
| 2000 | sizeof(struct gfs2_glock_iter)); |
| 2001 | if (ret == 0) { |
| 2002 | struct seq_file *seq = file->private_data; |
| 2003 | struct gfs2_glock_iter *gi = seq->private; |
| 2004 | gi->sdp = inode->i_private; |
Steven Whitehouse | 0fe2f1e | 2012-06-11 13:49:47 +0100 | [diff] [blame] | 2005 | seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN); |
Steven Whitehouse | df5d2f5 | 2012-06-07 13:30:16 +0100 | [diff] [blame] | 2006 | if (seq->buf) |
Steven Whitehouse | 0fe2f1e | 2012-06-11 13:49:47 +0100 | [diff] [blame] | 2007 | seq->size = GFS2_SEQ_GOODSIZE; |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 2008 | } |
| 2009 | return ret; |
| 2010 | } |
| 2011 | |
| 2012 | static int gfs2_sbstats_open(struct inode *inode, struct file *file) |
| 2013 | { |
| 2014 | int ret = seq_open_private(file, &gfs2_sbstats_seq_ops, |
| 2015 | sizeof(struct gfs2_glock_iter)); |
| 2016 | if (ret == 0) { |
| 2017 | struct seq_file *seq = file->private_data; |
| 2018 | struct gfs2_glock_iter *gi = seq->private; |
| 2019 | gi->sdp = inode->i_private; |
| 2020 | } |
| 2021 | return ret; |
| 2022 | } |
| 2023 | |
| 2024 | static const struct file_operations gfs2_glocks_fops = { |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 2025 | .owner = THIS_MODULE, |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 2026 | .open = gfs2_glocks_open, |
| 2027 | .read = seq_read, |
| 2028 | .llseek = seq_lseek, |
| 2029 | .release = seq_release_private, |
| 2030 | }; |
| 2031 | |
| 2032 | static const struct file_operations gfs2_glstats_fops = { |
| 2033 | .owner = THIS_MODULE, |
| 2034 | .open = gfs2_glstats_open, |
| 2035 | .read = seq_read, |
| 2036 | .llseek = seq_lseek, |
| 2037 | .release = seq_release_private, |
| 2038 | }; |
| 2039 | |
| 2040 | static const struct file_operations gfs2_sbstats_fops = { |
| 2041 | .owner = THIS_MODULE, |
| 2042 | .open = gfs2_sbstats_open, |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 2043 | .read = seq_read, |
| 2044 | .llseek = seq_lseek, |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 2045 | .release = seq_release_private, |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 2046 | }; |
| 2047 | |
| 2048 | int gfs2_create_debugfs_file(struct gfs2_sbd *sdp) |
| 2049 | { |
Robert Peterson | 5f88209 | 2007-04-18 11:41:11 -0500 | [diff] [blame] | 2050 | sdp->debugfs_dir = debugfs_create_dir(sdp->sd_table_name, gfs2_root); |
| 2051 | if (!sdp->debugfs_dir) |
| 2052 | return -ENOMEM; |
| 2053 | sdp->debugfs_dentry_glocks = debugfs_create_file("glocks", |
| 2054 | S_IFREG | S_IRUGO, |
| 2055 | sdp->debugfs_dir, sdp, |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 2056 | &gfs2_glocks_fops); |
Robert Peterson | 5f88209 | 2007-04-18 11:41:11 -0500 | [diff] [blame] | 2057 | if (!sdp->debugfs_dentry_glocks) |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 2058 | goto fail; |
| 2059 | |
| 2060 | sdp->debugfs_dentry_glstats = debugfs_create_file("glstats", |
| 2061 | S_IFREG | S_IRUGO, |
| 2062 | sdp->debugfs_dir, sdp, |
| 2063 | &gfs2_glstats_fops); |
| 2064 | if (!sdp->debugfs_dentry_glstats) |
| 2065 | goto fail; |
| 2066 | |
| 2067 | sdp->debugfs_dentry_sbstats = debugfs_create_file("sbstats", |
| 2068 | S_IFREG | S_IRUGO, |
| 2069 | sdp->debugfs_dir, sdp, |
| 2070 | &gfs2_sbstats_fops); |
| 2071 | if (!sdp->debugfs_dentry_sbstats) |
| 2072 | goto fail; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 2073 | |
| 2074 | return 0; |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 2075 | fail: |
| 2076 | gfs2_delete_debugfs_file(sdp); |
| 2077 | return -ENOMEM; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 2078 | } |
| 2079 | |
| 2080 | void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp) |
| 2081 | { |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 2082 | if (sdp->debugfs_dir) { |
Robert Peterson | 5f88209 | 2007-04-18 11:41:11 -0500 | [diff] [blame] | 2083 | if (sdp->debugfs_dentry_glocks) { |
| 2084 | debugfs_remove(sdp->debugfs_dentry_glocks); |
| 2085 | sdp->debugfs_dentry_glocks = NULL; |
| 2086 | } |
Steven Whitehouse | a245769 | 2012-01-20 10:38:36 +0000 | [diff] [blame] | 2087 | if (sdp->debugfs_dentry_glstats) { |
| 2088 | debugfs_remove(sdp->debugfs_dentry_glstats); |
| 2089 | sdp->debugfs_dentry_glstats = NULL; |
| 2090 | } |
| 2091 | if (sdp->debugfs_dentry_sbstats) { |
| 2092 | debugfs_remove(sdp->debugfs_dentry_sbstats); |
| 2093 | sdp->debugfs_dentry_sbstats = NULL; |
| 2094 | } |
Robert Peterson | 5f88209 | 2007-04-18 11:41:11 -0500 | [diff] [blame] | 2095 | debugfs_remove(sdp->debugfs_dir); |
| 2096 | sdp->debugfs_dir = NULL; |
| 2097 | } |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 2098 | } |
| 2099 | |
| 2100 | int gfs2_register_debugfs(void) |
| 2101 | { |
| 2102 | gfs2_root = debugfs_create_dir("gfs2", NULL); |
| 2103 | return gfs2_root ? 0 : -ENOMEM; |
| 2104 | } |
| 2105 | |
| 2106 | void gfs2_unregister_debugfs(void) |
| 2107 | { |
| 2108 | debugfs_remove(gfs2_root); |
Robert Peterson | 5f88209 | 2007-04-18 11:41:11 -0500 | [diff] [blame] | 2109 | gfs2_root = NULL; |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 2110 | } |