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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> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
f057f6cd SW |
13 | #include <linux/types.h> |
14 | #include <linux/gfs2_ondisk.h> | |
15 | ||
16 | #include "incore.h" | |
17 | #include "glock.h" | |
18 | #include "util.h" | |
19 | ||
20 | ||
21 | static void gdlm_ast(void *arg) | |
22 | { | |
23 | struct gfs2_glock *gl = arg; | |
24 | unsigned ret = gl->gl_state; | |
25 | ||
26 | BUG_ON(gl->gl_lksb.sb_flags & DLM_SBF_DEMOTED); | |
27 | ||
28 | if (gl->gl_lksb.sb_flags & DLM_SBF_VALNOTVALID) | |
29 | memset(gl->gl_lvb, 0, GDLM_LVB_SIZE); | |
30 | ||
31 | switch (gl->gl_lksb.sb_status) { | |
32 | case -DLM_EUNLOCK: /* Unlocked, so glock can be freed */ | |
fc0e38da | 33 | gfs2_glock_free(gl); |
f057f6cd SW |
34 | return; |
35 | case -DLM_ECANCEL: /* Cancel while getting lock */ | |
36 | ret |= LM_OUT_CANCELED; | |
37 | goto out; | |
38 | case -EAGAIN: /* Try lock fails */ | |
1fea7c25 | 39 | case -EDEADLK: /* Deadlock detected */ |
f057f6cd | 40 | goto out; |
1fea7c25 | 41 | case -ETIMEDOUT: /* Canceled due to timeout */ |
f057f6cd SW |
42 | ret |= LM_OUT_ERROR; |
43 | goto out; | |
44 | case 0: /* Success */ | |
45 | break; | |
46 | default: /* Something unexpected */ | |
47 | BUG(); | |
48 | } | |
49 | ||
02ffad08 | 50 | ret = gl->gl_req; |
f057f6cd | 51 | if (gl->gl_lksb.sb_flags & DLM_SBF_ALTMODE) { |
02ffad08 | 52 | if (gl->gl_req == LM_ST_SHARED) |
f057f6cd | 53 | ret = LM_ST_DEFERRED; |
02ffad08 | 54 | else if (gl->gl_req == LM_ST_DEFERRED) |
f057f6cd SW |
55 | ret = LM_ST_SHARED; |
56 | else | |
57 | BUG(); | |
58 | } | |
59 | ||
60 | set_bit(GLF_INITIAL, &gl->gl_flags); | |
61 | gfs2_glock_complete(gl, ret); | |
62 | return; | |
63 | out: | |
64 | if (!test_bit(GLF_INITIAL, &gl->gl_flags)) | |
65 | gl->gl_lksb.sb_lkid = 0; | |
66 | gfs2_glock_complete(gl, ret); | |
67 | } | |
68 | ||
69 | static void gdlm_bast(void *arg, int mode) | |
70 | { | |
71 | struct gfs2_glock *gl = arg; | |
72 | ||
73 | switch (mode) { | |
74 | case DLM_LOCK_EX: | |
75 | gfs2_glock_cb(gl, LM_ST_UNLOCKED); | |
76 | break; | |
77 | case DLM_LOCK_CW: | |
78 | gfs2_glock_cb(gl, LM_ST_DEFERRED); | |
79 | break; | |
80 | case DLM_LOCK_PR: | |
81 | gfs2_glock_cb(gl, LM_ST_SHARED); | |
82 | break; | |
83 | default: | |
84 | printk(KERN_ERR "unknown bast mode %d", mode); | |
85 | BUG(); | |
86 | } | |
87 | } | |
88 | ||
89 | /* convert gfs lock-state to dlm lock-mode */ | |
90 | ||
91 | static int make_mode(const unsigned int lmstate) | |
92 | { | |
93 | switch (lmstate) { | |
94 | case LM_ST_UNLOCKED: | |
95 | return DLM_LOCK_NL; | |
96 | case LM_ST_EXCLUSIVE: | |
97 | return DLM_LOCK_EX; | |
98 | case LM_ST_DEFERRED: | |
99 | return DLM_LOCK_CW; | |
100 | case LM_ST_SHARED: | |
101 | return DLM_LOCK_PR; | |
102 | } | |
103 | printk(KERN_ERR "unknown LM state %d", lmstate); | |
104 | BUG(); | |
105 | return -1; | |
106 | } | |
107 | ||
108 | static u32 make_flags(const u32 lkid, const unsigned int gfs_flags, | |
109 | const int req) | |
110 | { | |
111 | u32 lkf = 0; | |
112 | ||
113 | if (gfs_flags & LM_FLAG_TRY) | |
114 | lkf |= DLM_LKF_NOQUEUE; | |
115 | ||
116 | if (gfs_flags & LM_FLAG_TRY_1CB) { | |
117 | lkf |= DLM_LKF_NOQUEUE; | |
118 | lkf |= DLM_LKF_NOQUEUEBAST; | |
119 | } | |
120 | ||
121 | if (gfs_flags & LM_FLAG_PRIORITY) { | |
122 | lkf |= DLM_LKF_NOORDER; | |
123 | lkf |= DLM_LKF_HEADQUE; | |
124 | } | |
125 | ||
126 | if (gfs_flags & LM_FLAG_ANY) { | |
127 | if (req == DLM_LOCK_PR) | |
128 | lkf |= DLM_LKF_ALTCW; | |
129 | else if (req == DLM_LOCK_CW) | |
130 | lkf |= DLM_LKF_ALTPR; | |
131 | else | |
132 | BUG(); | |
133 | } | |
134 | ||
135 | if (lkid != 0) | |
136 | lkf |= DLM_LKF_CONVERT; | |
137 | ||
138 | lkf |= DLM_LKF_VALBLK; | |
139 | ||
140 | return lkf; | |
141 | } | |
142 | ||
921169ca SW |
143 | static int gdlm_lock(struct gfs2_glock *gl, unsigned int req_state, |
144 | unsigned int flags) | |
f057f6cd SW |
145 | { |
146 | struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct; | |
f057f6cd SW |
147 | int req; |
148 | u32 lkf; | |
149 | ||
150 | req = make_mode(req_state); | |
151 | lkf = make_flags(gl->gl_lksb.sb_lkid, flags, req); | |
152 | ||
153 | /* | |
154 | * Submit the actual lock request. | |
155 | */ | |
156 | ||
921169ca SW |
157 | return dlm_lock(ls->ls_dlm, req, &gl->gl_lksb, lkf, gl->gl_strname, |
158 | GDLM_STRNAME_BYTES - 1, 0, gdlm_ast, gl, gdlm_bast); | |
f057f6cd SW |
159 | } |
160 | ||
bc015cb8 | 161 | static void gdlm_put_lock(struct gfs2_glock *gl) |
f057f6cd | 162 | { |
e402746a SW |
163 | struct gfs2_sbd *sdp = gl->gl_sbd; |
164 | struct lm_lockstruct *ls = &sdp->sd_lockstruct; | |
f057f6cd SW |
165 | int error; |
166 | ||
167 | if (gl->gl_lksb.sb_lkid == 0) { | |
fc0e38da | 168 | gfs2_glock_free(gl); |
f057f6cd SW |
169 | return; |
170 | } | |
171 | ||
172 | error = dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_VALBLK, | |
173 | NULL, gl); | |
174 | if (error) { | |
175 | printk(KERN_ERR "gdlm_unlock %x,%llx err=%d\n", | |
176 | gl->gl_name.ln_type, | |
177 | (unsigned long long)gl->gl_name.ln_number, error); | |
178 | return; | |
179 | } | |
180 | } | |
181 | ||
182 | static void gdlm_cancel(struct gfs2_glock *gl) | |
183 | { | |
184 | struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct; | |
185 | dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_CANCEL, NULL, gl); | |
186 | } | |
187 | ||
188 | static int gdlm_mount(struct gfs2_sbd *sdp, const char *fsname) | |
189 | { | |
190 | struct lm_lockstruct *ls = &sdp->sd_lockstruct; | |
191 | int error; | |
192 | ||
193 | if (fsname == NULL) { | |
194 | fs_info(sdp, "no fsname found\n"); | |
195 | return -EINVAL; | |
196 | } | |
197 | ||
198 | error = dlm_new_lockspace(fsname, strlen(fsname), &ls->ls_dlm, | |
199 | DLM_LSFL_FS | DLM_LSFL_NEWEXCL | | |
200 | (ls->ls_nodir ? DLM_LSFL_NODIR : 0), | |
201 | GDLM_LVB_SIZE); | |
202 | if (error) | |
203 | printk(KERN_ERR "dlm_new_lockspace error %d", error); | |
204 | ||
205 | return error; | |
206 | } | |
207 | ||
208 | static void gdlm_unmount(struct gfs2_sbd *sdp) | |
209 | { | |
210 | struct lm_lockstruct *ls = &sdp->sd_lockstruct; | |
211 | ||
212 | if (ls->ls_dlm) { | |
213 | dlm_release_lockspace(ls->ls_dlm, 2); | |
214 | ls->ls_dlm = NULL; | |
215 | } | |
216 | } | |
217 | ||
218 | static const match_table_t dlm_tokens = { | |
219 | { Opt_jid, "jid=%d"}, | |
220 | { Opt_id, "id=%d"}, | |
221 | { Opt_first, "first=%d"}, | |
222 | { Opt_nodir, "nodir=%d"}, | |
223 | { Opt_err, NULL }, | |
224 | }; | |
225 | ||
226 | const struct lm_lockops gfs2_dlm_ops = { | |
227 | .lm_proto_name = "lock_dlm", | |
228 | .lm_mount = gdlm_mount, | |
229 | .lm_unmount = gdlm_unmount, | |
230 | .lm_put_lock = gdlm_put_lock, | |
231 | .lm_lock = gdlm_lock, | |
232 | .lm_cancel = gdlm_cancel, | |
233 | .lm_tokens = &dlm_tokens, | |
234 | }; | |
235 |