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f057f6cd SW |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3 | * Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved. | |
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 | |
7 | * of the GNU General Public License version 2. | |
8 | */ | |
9 | ||
10 | #include <linux/fs.h> | |
11 | #include <linux/dlm.h> | |
12 | #include <linux/types.h> | |
13 | #include <linux/gfs2_ondisk.h> | |
14 | ||
15 | #include "incore.h" | |
16 | #include "glock.h" | |
17 | #include "util.h" | |
18 | ||
19 | ||
20 | static void gdlm_ast(void *arg) | |
21 | { | |
22 | struct gfs2_glock *gl = arg; | |
23 | unsigned ret = gl->gl_state; | |
24 | ||
25 | BUG_ON(gl->gl_lksb.sb_flags & DLM_SBF_DEMOTED); | |
26 | ||
27 | if (gl->gl_lksb.sb_flags & DLM_SBF_VALNOTVALID) | |
28 | memset(gl->gl_lvb, 0, GDLM_LVB_SIZE); | |
29 | ||
30 | switch (gl->gl_lksb.sb_status) { | |
31 | case -DLM_EUNLOCK: /* Unlocked, so glock can be freed */ | |
32 | kmem_cache_free(gfs2_glock_cachep, gl); | |
33 | return; | |
34 | case -DLM_ECANCEL: /* Cancel while getting lock */ | |
35 | ret |= LM_OUT_CANCELED; | |
36 | goto out; | |
37 | case -EAGAIN: /* Try lock fails */ | |
38 | goto out; | |
39 | case -EINVAL: /* Invalid */ | |
40 | case -ENOMEM: /* Out of memory */ | |
41 | ret |= LM_OUT_ERROR; | |
42 | goto out; | |
43 | case 0: /* Success */ | |
44 | break; | |
45 | default: /* Something unexpected */ | |
46 | BUG(); | |
47 | } | |
48 | ||
02ffad08 | 49 | ret = gl->gl_req; |
f057f6cd | 50 | if (gl->gl_lksb.sb_flags & DLM_SBF_ALTMODE) { |
02ffad08 | 51 | if (gl->gl_req == LM_ST_SHARED) |
f057f6cd | 52 | ret = LM_ST_DEFERRED; |
02ffad08 | 53 | else if (gl->gl_req == LM_ST_DEFERRED) |
f057f6cd SW |
54 | ret = LM_ST_SHARED; |
55 | else | |
56 | BUG(); | |
57 | } | |
58 | ||
59 | set_bit(GLF_INITIAL, &gl->gl_flags); | |
60 | gfs2_glock_complete(gl, ret); | |
61 | return; | |
62 | out: | |
63 | if (!test_bit(GLF_INITIAL, &gl->gl_flags)) | |
64 | gl->gl_lksb.sb_lkid = 0; | |
65 | gfs2_glock_complete(gl, ret); | |
66 | } | |
67 | ||
68 | static void gdlm_bast(void *arg, int mode) | |
69 | { | |
70 | struct gfs2_glock *gl = arg; | |
71 | ||
72 | switch (mode) { | |
73 | case DLM_LOCK_EX: | |
74 | gfs2_glock_cb(gl, LM_ST_UNLOCKED); | |
75 | break; | |
76 | case DLM_LOCK_CW: | |
77 | gfs2_glock_cb(gl, LM_ST_DEFERRED); | |
78 | break; | |
79 | case DLM_LOCK_PR: | |
80 | gfs2_glock_cb(gl, LM_ST_SHARED); | |
81 | break; | |
82 | default: | |
83 | printk(KERN_ERR "unknown bast mode %d", mode); | |
84 | BUG(); | |
85 | } | |
86 | } | |
87 | ||
88 | /* convert gfs lock-state to dlm lock-mode */ | |
89 | ||
90 | static int make_mode(const unsigned int lmstate) | |
91 | { | |
92 | switch (lmstate) { | |
93 | case LM_ST_UNLOCKED: | |
94 | return DLM_LOCK_NL; | |
95 | case LM_ST_EXCLUSIVE: | |
96 | return DLM_LOCK_EX; | |
97 | case LM_ST_DEFERRED: | |
98 | return DLM_LOCK_CW; | |
99 | case LM_ST_SHARED: | |
100 | return DLM_LOCK_PR; | |
101 | } | |
102 | printk(KERN_ERR "unknown LM state %d", lmstate); | |
103 | BUG(); | |
104 | return -1; | |
105 | } | |
106 | ||
107 | static u32 make_flags(const u32 lkid, const unsigned int gfs_flags, | |
108 | const int req) | |
109 | { | |
110 | u32 lkf = 0; | |
111 | ||
112 | if (gfs_flags & LM_FLAG_TRY) | |
113 | lkf |= DLM_LKF_NOQUEUE; | |
114 | ||
115 | if (gfs_flags & LM_FLAG_TRY_1CB) { | |
116 | lkf |= DLM_LKF_NOQUEUE; | |
117 | lkf |= DLM_LKF_NOQUEUEBAST; | |
118 | } | |
119 | ||
120 | if (gfs_flags & LM_FLAG_PRIORITY) { | |
121 | lkf |= DLM_LKF_NOORDER; | |
122 | lkf |= DLM_LKF_HEADQUE; | |
123 | } | |
124 | ||
125 | if (gfs_flags & LM_FLAG_ANY) { | |
126 | if (req == DLM_LOCK_PR) | |
127 | lkf |= DLM_LKF_ALTCW; | |
128 | else if (req == DLM_LOCK_CW) | |
129 | lkf |= DLM_LKF_ALTPR; | |
130 | else | |
131 | BUG(); | |
132 | } | |
133 | ||
134 | if (lkid != 0) | |
135 | lkf |= DLM_LKF_CONVERT; | |
136 | ||
137 | lkf |= DLM_LKF_VALBLK; | |
138 | ||
139 | return lkf; | |
140 | } | |
141 | ||
142 | static unsigned int gdlm_lock(struct gfs2_glock *gl, | |
143 | unsigned int req_state, unsigned int flags) | |
144 | { | |
145 | struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct; | |
146 | int error; | |
147 | int req; | |
148 | u32 lkf; | |
149 | ||
02ffad08 | 150 | gl->gl_req = req_state; |
f057f6cd SW |
151 | req = make_mode(req_state); |
152 | lkf = make_flags(gl->gl_lksb.sb_lkid, flags, req); | |
153 | ||
154 | /* | |
155 | * Submit the actual lock request. | |
156 | */ | |
157 | ||
158 | error = dlm_lock(ls->ls_dlm, req, &gl->gl_lksb, lkf, gl->gl_strname, | |
159 | GDLM_STRNAME_BYTES - 1, 0, gdlm_ast, gl, gdlm_bast); | |
160 | if (error == -EAGAIN) | |
161 | return 0; | |
162 | if (error) | |
163 | return LM_OUT_ERROR; | |
164 | return LM_OUT_ASYNC; | |
165 | } | |
166 | ||
167 | static void gdlm_put_lock(struct kmem_cache *cachep, void *ptr) | |
168 | { | |
169 | struct gfs2_glock *gl = ptr; | |
170 | struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct; | |
171 | int error; | |
172 | ||
173 | if (gl->gl_lksb.sb_lkid == 0) { | |
174 | kmem_cache_free(cachep, gl); | |
175 | return; | |
176 | } | |
177 | ||
178 | error = dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_VALBLK, | |
179 | NULL, gl); | |
180 | if (error) { | |
181 | printk(KERN_ERR "gdlm_unlock %x,%llx err=%d\n", | |
182 | gl->gl_name.ln_type, | |
183 | (unsigned long long)gl->gl_name.ln_number, error); | |
184 | return; | |
185 | } | |
186 | } | |
187 | ||
188 | static void gdlm_cancel(struct gfs2_glock *gl) | |
189 | { | |
190 | struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct; | |
191 | dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_CANCEL, NULL, gl); | |
192 | } | |
193 | ||
194 | static int gdlm_mount(struct gfs2_sbd *sdp, const char *fsname) | |
195 | { | |
196 | struct lm_lockstruct *ls = &sdp->sd_lockstruct; | |
197 | int error; | |
198 | ||
199 | if (fsname == NULL) { | |
200 | fs_info(sdp, "no fsname found\n"); | |
201 | return -EINVAL; | |
202 | } | |
203 | ||
204 | error = dlm_new_lockspace(fsname, strlen(fsname), &ls->ls_dlm, | |
205 | DLM_LSFL_FS | DLM_LSFL_NEWEXCL | | |
206 | (ls->ls_nodir ? DLM_LSFL_NODIR : 0), | |
207 | GDLM_LVB_SIZE); | |
208 | if (error) | |
209 | printk(KERN_ERR "dlm_new_lockspace error %d", error); | |
210 | ||
211 | return error; | |
212 | } | |
213 | ||
214 | static void gdlm_unmount(struct gfs2_sbd *sdp) | |
215 | { | |
216 | struct lm_lockstruct *ls = &sdp->sd_lockstruct; | |
217 | ||
218 | if (ls->ls_dlm) { | |
219 | dlm_release_lockspace(ls->ls_dlm, 2); | |
220 | ls->ls_dlm = NULL; | |
221 | } | |
222 | } | |
223 | ||
224 | static const match_table_t dlm_tokens = { | |
225 | { Opt_jid, "jid=%d"}, | |
226 | { Opt_id, "id=%d"}, | |
227 | { Opt_first, "first=%d"}, | |
228 | { Opt_nodir, "nodir=%d"}, | |
229 | { Opt_err, NULL }, | |
230 | }; | |
231 | ||
232 | const struct lm_lockops gfs2_dlm_ops = { | |
233 | .lm_proto_name = "lock_dlm", | |
234 | .lm_mount = gdlm_mount, | |
235 | .lm_unmount = gdlm_unmount, | |
236 | .lm_put_lock = gdlm_put_lock, | |
237 | .lm_lock = gdlm_lock, | |
238 | .lm_cancel = gdlm_cancel, | |
239 | .lm_tokens = &dlm_tokens, | |
240 | }; | |
241 |