2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved.
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
11 #include <linux/dlm.h>
12 #include <linux/types.h>
13 #include <linux/gfs2_ondisk.h>
20 static void gdlm_ast(void *arg)
22 struct gfs2_glock *gl = arg;
23 unsigned ret = gl->gl_state;
24 struct gfs2_sbd *sdp = gl->gl_sbd;
26 BUG_ON(gl->gl_lksb.sb_flags & DLM_SBF_DEMOTED);
28 if (gl->gl_lksb.sb_flags & DLM_SBF_VALNOTVALID)
29 memset(gl->gl_lvb, 0, GDLM_LVB_SIZE);
31 switch (gl->gl_lksb.sb_status) {
32 case -DLM_EUNLOCK: /* Unlocked, so glock can be freed */
33 kmem_cache_free(gfs2_glock_cachep, gl);
34 if (atomic_dec_and_test(&sdp->sd_glock_disposal))
35 wake_up(&sdp->sd_glock_wait);
37 case -DLM_ECANCEL: /* Cancel while getting lock */
38 ret |= LM_OUT_CANCELED;
40 case -EAGAIN: /* Try lock fails */
42 case -EINVAL: /* Invalid */
43 case -ENOMEM: /* Out of memory */
48 default: /* Something unexpected */
53 if (gl->gl_lksb.sb_flags & DLM_SBF_ALTMODE) {
54 if (gl->gl_req == LM_ST_SHARED)
56 else if (gl->gl_req == LM_ST_DEFERRED)
62 set_bit(GLF_INITIAL, &gl->gl_flags);
63 gfs2_glock_complete(gl, ret);
66 if (!test_bit(GLF_INITIAL, &gl->gl_flags))
67 gl->gl_lksb.sb_lkid = 0;
68 gfs2_glock_complete(gl, ret);
71 static void gdlm_bast(void *arg, int mode)
73 struct gfs2_glock *gl = arg;
77 gfs2_glock_cb(gl, LM_ST_UNLOCKED);
80 gfs2_glock_cb(gl, LM_ST_DEFERRED);
83 gfs2_glock_cb(gl, LM_ST_SHARED);
86 printk(KERN_ERR "unknown bast mode %d", mode);
91 /* convert gfs lock-state to dlm lock-mode */
93 static int make_mode(const unsigned int lmstate)
105 printk(KERN_ERR "unknown LM state %d", lmstate);
110 static u32 make_flags(const u32 lkid, const unsigned int gfs_flags,
115 if (gfs_flags & LM_FLAG_TRY)
116 lkf |= DLM_LKF_NOQUEUE;
118 if (gfs_flags & LM_FLAG_TRY_1CB) {
119 lkf |= DLM_LKF_NOQUEUE;
120 lkf |= DLM_LKF_NOQUEUEBAST;
123 if (gfs_flags & LM_FLAG_PRIORITY) {
124 lkf |= DLM_LKF_NOORDER;
125 lkf |= DLM_LKF_HEADQUE;
128 if (gfs_flags & LM_FLAG_ANY) {
129 if (req == DLM_LOCK_PR)
130 lkf |= DLM_LKF_ALTCW;
131 else if (req == DLM_LOCK_CW)
132 lkf |= DLM_LKF_ALTPR;
138 lkf |= DLM_LKF_CONVERT;
140 lkf |= DLM_LKF_VALBLK;
145 static unsigned int gdlm_lock(struct gfs2_glock *gl,
146 unsigned int req_state, unsigned int flags)
148 struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct;
153 gl->gl_req = req_state;
154 req = make_mode(req_state);
155 lkf = make_flags(gl->gl_lksb.sb_lkid, flags, req);
158 * Submit the actual lock request.
161 error = dlm_lock(ls->ls_dlm, req, &gl->gl_lksb, lkf, gl->gl_strname,
162 GDLM_STRNAME_BYTES - 1, 0, gdlm_ast, gl, gdlm_bast);
163 if (error == -EAGAIN)
170 static void gdlm_put_lock(struct kmem_cache *cachep, struct gfs2_glock *gl)
172 struct gfs2_sbd *sdp = gl->gl_sbd;
173 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
176 if (gl->gl_lksb.sb_lkid == 0) {
177 kmem_cache_free(cachep, gl);
178 if (atomic_dec_and_test(&sdp->sd_glock_disposal))
179 wake_up(&sdp->sd_glock_wait);
183 error = dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_VALBLK,
186 printk(KERN_ERR "gdlm_unlock %x,%llx err=%d\n",
188 (unsigned long long)gl->gl_name.ln_number, error);
193 static void gdlm_cancel(struct gfs2_glock *gl)
195 struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct;
196 dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_CANCEL, NULL, gl);
199 static int gdlm_mount(struct gfs2_sbd *sdp, const char *fsname)
201 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
204 if (fsname == NULL) {
205 fs_info(sdp, "no fsname found\n");
209 error = dlm_new_lockspace(fsname, strlen(fsname), &ls->ls_dlm,
210 DLM_LSFL_FS | DLM_LSFL_NEWEXCL |
211 (ls->ls_nodir ? DLM_LSFL_NODIR : 0),
214 printk(KERN_ERR "dlm_new_lockspace error %d", error);
219 static void gdlm_unmount(struct gfs2_sbd *sdp)
221 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
224 dlm_release_lockspace(ls->ls_dlm, 2);
229 static const match_table_t dlm_tokens = {
230 { Opt_jid, "jid=%d"},
232 { Opt_first, "first=%d"},
233 { Opt_nodir, "nodir=%d"},
237 const struct lm_lockops gfs2_dlm_ops = {
238 .lm_proto_name = "lock_dlm",
239 .lm_mount = gdlm_mount,
240 .lm_unmount = gdlm_unmount,
241 .lm_put_lock = gdlm_put_lock,
242 .lm_lock = gdlm_lock,
243 .lm_cancel = gdlm_cancel,
244 .lm_tokens = &dlm_tokens,