xref: /openbmc/linux/fs/gfs2/log.h (revision cb8a7d53)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
4  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
5  */
6 
7 #ifndef __LOG_DOT_H__
8 #define __LOG_DOT_H__
9 
10 #include <linux/list.h>
11 #include <linux/spinlock.h>
12 #include <linux/writeback.h>
13 #include "incore.h"
14 #include "inode.h"
15 
16 /*
17  * The minimum amount of log space required for a log flush is one block for
18  * revokes and one block for the log header.  Log flushes other than
19  * GFS2_LOG_HEAD_FLUSH_NORMAL may write one or two more log headers.
20  */
21 #define GFS2_LOG_FLUSH_MIN_BLOCKS 4
22 
23 /**
24  * gfs2_log_lock - acquire the right to mess with the log manager
25  * @sdp: the filesystem
26  *
27  */
28 
29 static inline void gfs2_log_lock(struct gfs2_sbd *sdp)
30 __acquires(&sdp->sd_log_lock)
31 {
32 	spin_lock(&sdp->sd_log_lock);
33 }
34 
35 /**
36  * gfs2_log_unlock - release the right to mess with the log manager
37  * @sdp: the filesystem
38  *
39  */
40 
41 static inline void gfs2_log_unlock(struct gfs2_sbd *sdp)
42 __releases(&sdp->sd_log_lock)
43 {
44 	spin_unlock(&sdp->sd_log_lock);
45 }
46 
47 static inline void gfs2_log_pointers_init(struct gfs2_sbd *sdp,
48 					  unsigned int value)
49 {
50 	if (++value == sdp->sd_jdesc->jd_blocks) {
51 		value = 0;
52 	}
53 	sdp->sd_log_tail = value;
54 	sdp->sd_log_flush_tail = value;
55 	sdp->sd_log_head = value;
56 }
57 
58 static inline void gfs2_ordered_add_inode(struct gfs2_inode *ip)
59 {
60 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
61 
62 	if (gfs2_is_jdata(ip) || !gfs2_is_ordered(sdp))
63 		return;
64 
65 	if (list_empty(&ip->i_ordered)) {
66 		spin_lock(&sdp->sd_ordered_lock);
67 		if (list_empty(&ip->i_ordered))
68 			list_add(&ip->i_ordered, &sdp->sd_log_ordered);
69 		spin_unlock(&sdp->sd_ordered_lock);
70 	}
71 }
72 
73 extern void gfs2_ordered_del_inode(struct gfs2_inode *ip);
74 extern unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct);
75 extern void gfs2_remove_from_ail(struct gfs2_bufdata *bd);
76 extern bool gfs2_log_is_empty(struct gfs2_sbd *sdp);
77 extern void gfs2_log_release_revokes(struct gfs2_sbd *sdp, unsigned int revokes);
78 extern void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks);
79 extern bool gfs2_log_try_reserve(struct gfs2_sbd *sdp, struct gfs2_trans *tr,
80 				 unsigned int *extra_revokes);
81 extern void gfs2_log_reserve(struct gfs2_sbd *sdp, struct gfs2_trans *tr,
82 			     unsigned int *extra_revokes);
83 extern void gfs2_write_log_header(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd,
84 				  u64 seq, u32 tail, u32 lblock, u32 flags,
85 				  blk_opf_t op_flags);
86 extern void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl,
87 			   u32 type);
88 extern void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *trans);
89 extern void gfs2_ail1_flush(struct gfs2_sbd *sdp, struct writeback_control *wbc);
90 extern void log_flush_wait(struct gfs2_sbd *sdp);
91 
92 extern int gfs2_logd(void *data);
93 extern void gfs2_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd);
94 extern void gfs2_glock_remove_revoke(struct gfs2_glock *gl);
95 extern void gfs2_flush_revokes(struct gfs2_sbd *sdp);
96 extern void gfs2_ail_drain(struct gfs2_sbd *sdp);
97 
98 #endif /* __LOG_DOT_H__ */
99