David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
Steven Whitehouse | 3a8a9a1 | 2006-05-18 15:09:15 -0400 | [diff] [blame] | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 4 | * |
| 5 | * This copyrighted material is made available to anyone wishing to use, |
| 6 | * modify, copy, or redistribute it subject to the terms and conditions |
Steven Whitehouse | e9fc2aa | 2006-09-01 11:05:15 -0400 | [diff] [blame] | 7 | * of the GNU General Public License version 2. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 8 | */ |
| 9 | |
| 10 | #ifndef __GLOCK_DOT_H__ |
| 11 | #define __GLOCK_DOT_H__ |
| 12 | |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 13 | #include <linux/sched.h> |
Steven Whitehouse | f2f7ba5 | 2006-09-05 10:39:21 -0400 | [diff] [blame] | 14 | #include "incore.h" |
| 15 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 16 | /* Flags for lock requests; used in gfs2_holder gh_flag field. |
| 17 | From lm_interface.h: |
| 18 | #define LM_FLAG_TRY 0x00000001 |
| 19 | #define LM_FLAG_TRY_1CB 0x00000002 |
| 20 | #define LM_FLAG_NOEXP 0x00000004 |
| 21 | #define LM_FLAG_ANY 0x00000008 |
| 22 | #define LM_FLAG_PRIORITY 0x00000010 */ |
| 23 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 24 | #define GL_ASYNC 0x00000040 |
| 25 | #define GL_EXACT 0x00000080 |
| 26 | #define GL_SKIP 0x00000100 |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 27 | #define GL_NOCACHE 0x00000400 |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 28 | |
| 29 | #define GLR_TRYFAILED 13 |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 30 | |
Steven Whitehouse | 7afd88d | 2008-02-22 16:07:18 +0000 | [diff] [blame] | 31 | static inline struct gfs2_holder *gfs2_glock_is_locked_by_me(struct gfs2_glock *gl) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 32 | { |
| 33 | struct gfs2_holder *gh; |
Pavel Emelyanov | b1e058d | 2008-02-07 00:13:19 -0800 | [diff] [blame] | 34 | struct pid *pid; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 35 | |
| 36 | /* Look in glock's list of holders for one with current task as owner */ |
| 37 | spin_lock(&gl->gl_spin); |
Pavel Emelyanov | b1e058d | 2008-02-07 00:13:19 -0800 | [diff] [blame] | 38 | pid = task_pid(current); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 39 | list_for_each_entry(gh, &gl->gl_holders, gh_list) { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 40 | if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) |
| 41 | break; |
Steven Whitehouse | 7afd88d | 2008-02-22 16:07:18 +0000 | [diff] [blame] | 42 | if (gh->gh_owner_pid == pid) |
| 43 | goto out; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 44 | } |
Steven Whitehouse | 7afd88d | 2008-02-22 16:07:18 +0000 | [diff] [blame] | 45 | gh = NULL; |
| 46 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 47 | spin_unlock(&gl->gl_spin); |
| 48 | |
Steven Whitehouse | 7afd88d | 2008-02-22 16:07:18 +0000 | [diff] [blame] | 49 | return gh; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl) |
| 53 | { |
Steven Whitehouse | 5029996 | 2006-09-04 09:49:55 -0400 | [diff] [blame] | 54 | return gl->gl_state == LM_ST_EXCLUSIVE; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 55 | } |
| 56 | |
| 57 | static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl) |
| 58 | { |
Steven Whitehouse | 5029996 | 2006-09-04 09:49:55 -0400 | [diff] [blame] | 59 | return gl->gl_state == LM_ST_DEFERRED; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 60 | } |
| 61 | |
| 62 | static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl) |
| 63 | { |
Steven Whitehouse | 5029996 | 2006-09-04 09:49:55 -0400 | [diff] [blame] | 64 | return gl->gl_state == LM_ST_SHARED; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 65 | } |
| 66 | |
| 67 | static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl) |
| 68 | { |
| 69 | int ret; |
| 70 | spin_lock(&gl->gl_spin); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 71 | ret = test_bit(GLF_DEMOTE, &gl->gl_flags); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 72 | spin_unlock(&gl->gl_spin); |
| 73 | return ret; |
| 74 | } |
| 75 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 76 | int gfs2_glock_get(struct gfs2_sbd *sdp, |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 77 | u64 number, const struct gfs2_glock_operations *glops, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 78 | int create, struct gfs2_glock **glp); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 79 | int gfs2_glock_put(struct gfs2_glock *gl); |
Steven Whitehouse | 190562b | 2006-04-20 16:57:23 -0400 | [diff] [blame] | 80 | 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] | 81 | struct gfs2_holder *gh); |
Steven Whitehouse | 190562b | 2006-04-20 16:57:23 -0400 | [diff] [blame] | 82 | void gfs2_holder_reinit(unsigned int state, unsigned flags, |
| 83 | struct gfs2_holder *gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 84 | void gfs2_holder_uninit(struct gfs2_holder *gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 85 | int gfs2_glock_nq(struct gfs2_holder *gh); |
| 86 | int gfs2_glock_poll(struct gfs2_holder *gh); |
| 87 | int gfs2_glock_wait(struct gfs2_holder *gh); |
| 88 | void gfs2_glock_dq(struct gfs2_holder *gh); |
Abhijith Das | d93cfa9 | 2007-06-11 08:22:32 +0100 | [diff] [blame] | 89 | void gfs2_glock_dq_wait(struct gfs2_holder *gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 90 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 91 | void gfs2_glock_dq_uninit(struct gfs2_holder *gh); |
| 92 | int gfs2_glock_nq_num(struct gfs2_sbd *sdp, |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 93 | u64 number, const struct gfs2_glock_operations *glops, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 94 | unsigned int state, int flags, struct gfs2_holder *gh); |
| 95 | |
| 96 | int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs); |
| 97 | void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs); |
| 98 | void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs); |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 99 | void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 100 | |
Steven Whitehouse | d0dc80d | 2006-03-29 14:36:49 -0500 | [diff] [blame] | 101 | /** |
| 102 | * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock |
| 103 | * @gl: the glock |
| 104 | * @state: the state we're requesting |
| 105 | * @flags: the modifier flags |
| 106 | * @gh: the holder structure |
| 107 | * |
| 108 | * Returns: 0, GLR_*, or errno |
| 109 | */ |
| 110 | |
| 111 | static inline int gfs2_glock_nq_init(struct gfs2_glock *gl, |
| 112 | unsigned int state, int flags, |
| 113 | struct gfs2_holder *gh) |
| 114 | { |
| 115 | int error; |
| 116 | |
| 117 | gfs2_holder_init(gl, state, flags, gh); |
| 118 | |
| 119 | error = gfs2_glock_nq(gh); |
| 120 | if (error) |
| 121 | gfs2_holder_uninit(gh); |
| 122 | |
| 123 | return error; |
| 124 | } |
| 125 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 126 | /* Lock Value Block functions */ |
| 127 | |
| 128 | int gfs2_lvb_hold(struct gfs2_glock *gl); |
| 129 | void gfs2_lvb_unhold(struct gfs2_glock *gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 130 | |
Steven Whitehouse | 9b47c11 | 2006-09-08 10:17:58 -0400 | [diff] [blame] | 131 | void gfs2_glock_cb(void *cb_data, unsigned int type, void *data); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 132 | void gfs2_reclaim_glock(struct gfs2_sbd *sdp); |
Steven Whitehouse | 1bdad60 | 2008-06-03 14:09:53 +0100 | [diff] [blame] | 133 | void gfs2_gl_hash_clear(struct gfs2_sbd *sdp); |
Steven Whitehouse | 813e0c4 | 2008-11-18 13:38:48 +0000 | [diff] [blame] | 134 | void gfs2_glock_finish_truncate(struct gfs2_inode *ip); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 135 | |
Steven Whitehouse | 85d1da6 | 2006-09-07 14:40:21 -0400 | [diff] [blame] | 136 | int __init gfs2_glock_init(void); |
Steven Whitehouse | 8fbbfd2 | 2007-08-01 13:57:10 +0100 | [diff] [blame] | 137 | void gfs2_glock_exit(void); |
| 138 | |
Robert Peterson | 7c52b16 | 2007-03-16 10:26:37 +0000 | [diff] [blame] | 139 | int gfs2_create_debugfs_file(struct gfs2_sbd *sdp); |
| 140 | void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp); |
| 141 | int gfs2_register_debugfs(void); |
| 142 | void gfs2_unregister_debugfs(void); |
Steven Whitehouse | 85d1da6 | 2006-09-07 14:40:21 -0400 | [diff] [blame] | 143 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 144 | #endif /* __GLOCK_DOT_H__ */ |