1 // SPDX-License-Identifier: GPL-2.0-or-later 1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* !! 2 /* -*- mode: c; c-basic-offset: 8; -*-
>> 3 * vim: noexpandtab sw=8 ts=8 sts=0:
>> 4 *
3 * locks.c 5 * locks.c
4 * 6 *
5 * Userspace file locking support 7 * Userspace file locking support
6 * 8 *
7 * Copyright (C) 2007 Oracle. All rights rese 9 * Copyright (C) 2007 Oracle. All rights reserved.
8 */ 10 */
9 11
10 #include <linux/fs.h> 12 #include <linux/fs.h>
11 #include <linux/filelock.h> <<
12 #include <linux/fcntl.h> 13 #include <linux/fcntl.h>
13 14
14 #include <cluster/masklog.h> 15 #include <cluster/masklog.h>
15 16
16 #include "ocfs2.h" 17 #include "ocfs2.h"
17 18
18 #include "dlmglue.h" 19 #include "dlmglue.h"
19 #include "file.h" 20 #include "file.h"
20 #include "inode.h" 21 #include "inode.h"
21 #include "locks.h" 22 #include "locks.h"
22 23
23 static int ocfs2_do_flock(struct file *file, s 24 static int ocfs2_do_flock(struct file *file, struct inode *inode,
24 int cmd, struct file 25 int cmd, struct file_lock *fl)
25 { 26 {
26 int ret = 0, level = 0, trylock = 0; 27 int ret = 0, level = 0, trylock = 0;
27 struct ocfs2_file_private *fp = file-> 28 struct ocfs2_file_private *fp = file->private_data;
28 struct ocfs2_lock_res *lockres = &fp-> 29 struct ocfs2_lock_res *lockres = &fp->fp_flock;
29 30
30 if (lock_is_write(fl)) !! 31 if (fl->fl_type == F_WRLCK)
31 level = 1; 32 level = 1;
32 if (!IS_SETLKW(cmd)) 33 if (!IS_SETLKW(cmd))
33 trylock = 1; 34 trylock = 1;
34 35
35 mutex_lock(&fp->fp_mutex); 36 mutex_lock(&fp->fp_mutex);
36 37
37 if (lockres->l_flags & OCFS2_LOCK_ATTA 38 if (lockres->l_flags & OCFS2_LOCK_ATTACHED &&
38 lockres->l_level > LKM_NLMODE) { 39 lockres->l_level > LKM_NLMODE) {
39 int old_level = 0; 40 int old_level = 0;
40 struct file_lock request; 41 struct file_lock request;
41 42
42 if (lockres->l_level == LKM_EX 43 if (lockres->l_level == LKM_EXMODE)
43 old_level = 1; 44 old_level = 1;
44 45
45 if (level == old_level) 46 if (level == old_level)
46 goto out; 47 goto out;
47 48
48 /* 49 /*
49 * Converting an existing lock 50 * Converting an existing lock is not guaranteed to be
50 * atomic, so we can get away 51 * atomic, so we can get away with simply unlocking
51 * here and allowing the lock 52 * here and allowing the lock code to try at the new
52 * level. 53 * level.
53 */ 54 */
54 55
55 locks_init_lock(&request); 56 locks_init_lock(&request);
56 request.c.flc_type = F_UNLCK; !! 57 request.fl_type = F_UNLCK;
57 request.c.flc_flags = FL_FLOCK !! 58 request.fl_flags = FL_FLOCK;
58 locks_lock_file_wait(file, &re 59 locks_lock_file_wait(file, &request);
59 60
60 ocfs2_file_unlock(file); 61 ocfs2_file_unlock(file);
61 } 62 }
62 63
63 ret = ocfs2_file_lock(file, level, try 64 ret = ocfs2_file_lock(file, level, trylock);
64 if (ret) { 65 if (ret) {
65 if (ret == -EAGAIN && trylock) 66 if (ret == -EAGAIN && trylock)
66 ret = -EWOULDBLOCK; 67 ret = -EWOULDBLOCK;
67 else 68 else
68 mlog_errno(ret); 69 mlog_errno(ret);
69 goto out; 70 goto out;
70 } 71 }
71 72
72 ret = locks_lock_file_wait(file, fl); 73 ret = locks_lock_file_wait(file, fl);
73 if (ret) 74 if (ret)
74 ocfs2_file_unlock(file); 75 ocfs2_file_unlock(file);
75 76
76 out: 77 out:
77 mutex_unlock(&fp->fp_mutex); 78 mutex_unlock(&fp->fp_mutex);
78 79
79 return ret; 80 return ret;
80 } 81 }
81 82
82 static int ocfs2_do_funlock(struct file *file, 83 static int ocfs2_do_funlock(struct file *file, int cmd, struct file_lock *fl)
83 { 84 {
84 int ret; 85 int ret;
85 struct ocfs2_file_private *fp = file-> 86 struct ocfs2_file_private *fp = file->private_data;
86 87
87 mutex_lock(&fp->fp_mutex); 88 mutex_lock(&fp->fp_mutex);
88 ocfs2_file_unlock(file); 89 ocfs2_file_unlock(file);
89 ret = locks_lock_file_wait(file, fl); 90 ret = locks_lock_file_wait(file, fl);
90 mutex_unlock(&fp->fp_mutex); 91 mutex_unlock(&fp->fp_mutex);
91 92
92 return ret; 93 return ret;
93 } 94 }
94 95
95 /* 96 /*
96 * Overall flow of ocfs2_flock() was influence 97 * Overall flow of ocfs2_flock() was influenced by gfs2_flock().
97 */ 98 */
98 int ocfs2_flock(struct file *file, int cmd, st 99 int ocfs2_flock(struct file *file, int cmd, struct file_lock *fl)
99 { 100 {
100 struct inode *inode = file->f_mapping- 101 struct inode *inode = file->f_mapping->host;
101 struct ocfs2_super *osb = OCFS2_SB(ino 102 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
102 103
103 if (!(fl->c.flc_flags & FL_FLOCK)) !! 104 if (!(fl->fl_flags & FL_FLOCK))
>> 105 return -ENOLCK;
>> 106 if (__mandatory_lock(inode))
104 return -ENOLCK; 107 return -ENOLCK;
105 108
106 if ((osb->s_mount_opt & OCFS2_MOUNT_LO 109 if ((osb->s_mount_opt & OCFS2_MOUNT_LOCALFLOCKS) ||
107 ocfs2_mount_local(osb)) 110 ocfs2_mount_local(osb))
108 return locks_lock_file_wait(fi 111 return locks_lock_file_wait(file, fl);
109 112
110 if (lock_is_unlock(fl)) !! 113 if (fl->fl_type == F_UNLCK)
111 return ocfs2_do_funlock(file, 114 return ocfs2_do_funlock(file, cmd, fl);
112 else 115 else
113 return ocfs2_do_flock(file, in 116 return ocfs2_do_flock(file, inode, cmd, fl);
114 } 117 }
115 118
116 int ocfs2_lock(struct file *file, int cmd, str 119 int ocfs2_lock(struct file *file, int cmd, struct file_lock *fl)
117 { 120 {
118 struct inode *inode = file->f_mapping- 121 struct inode *inode = file->f_mapping->host;
119 struct ocfs2_super *osb = OCFS2_SB(ino 122 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
120 123
121 if (!(fl->c.flc_flags & FL_POSIX)) !! 124 if (!(fl->fl_flags & FL_POSIX))
>> 125 return -ENOLCK;
>> 126 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
122 return -ENOLCK; 127 return -ENOLCK;
123 128
124 return ocfs2_plock(osb->cconn, OCFS2_I 129 return ocfs2_plock(osb->cconn, OCFS2_I(inode)->ip_blkno, file, cmd, fl);
125 } 130 }
126 131
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