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