aboutsummaryrefslogtreecommitdiffstats
path: root/fs/sysfs
diff options
context:
space:
mode:
Diffstat (limited to 'fs/sysfs')
-rw-r--r--fs/sysfs/dir.c88
-rw-r--r--fs/sysfs/sysfs.h94
2 files changed, 94 insertions, 88 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 06dff2c30c9b..f5f0b936f181 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -20,6 +20,94 @@ spinlock_t kobj_sysfs_assoc_lock = SPIN_LOCK_UNLOCKED;
20static spinlock_t sysfs_ino_lock = SPIN_LOCK_UNLOCKED; 20static spinlock_t sysfs_ino_lock = SPIN_LOCK_UNLOCKED;
21static DEFINE_IDA(sysfs_ino_ida); 21static DEFINE_IDA(sysfs_ino_ida);
22 22
23/**
24 * sysfs_get_active - get an active reference to sysfs_dirent
25 * @sd: sysfs_dirent to get an active reference to
26 *
27 * Get an active reference of @sd. This function is noop if @sd
28 * is NULL.
29 *
30 * RETURNS:
31 * Pointer to @sd on success, NULL on failure.
32 */
33struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd)
34{
35 if (sd) {
36 if (unlikely(!down_read_trylock(&sd->s_active)))
37 sd = NULL;
38 }
39 return sd;
40}
41
42/**
43 * sysfs_put_active - put an active reference to sysfs_dirent
44 * @sd: sysfs_dirent to put an active reference to
45 *
46 * Put an active reference to @sd. This function is noop if @sd
47 * is NULL.
48 */
49void sysfs_put_active(struct sysfs_dirent *sd)
50{
51 if (sd)
52 up_read(&sd->s_active);
53}
54
55/**
56 * sysfs_get_active_two - get active references to sysfs_dirent and parent
57 * @sd: sysfs_dirent of interest
58 *
59 * Get active reference to @sd and its parent. Parent's active
60 * reference is grabbed first. This function is noop if @sd is
61 * NULL.
62 *
63 * RETURNS:
64 * Pointer to @sd on success, NULL on failure.
65 */
66struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd)
67{
68 if (sd) {
69 if (sd->s_parent && unlikely(!sysfs_get_active(sd->s_parent)))
70 return NULL;
71 if (unlikely(!sysfs_get_active(sd))) {
72 sysfs_put_active(sd->s_parent);
73 return NULL;
74 }
75 }
76 return sd;
77}
78
79/**
80 * sysfs_put_active_two - put active references to sysfs_dirent and parent
81 * @sd: sysfs_dirent of interest
82 *
83 * Put active references to @sd and its parent. This function is
84 * noop if @sd is NULL.
85 */
86void sysfs_put_active_two(struct sysfs_dirent *sd)
87{
88 if (sd) {
89 sysfs_put_active(sd);
90 sysfs_put_active(sd->s_parent);
91 }
92}
93
94/**
95 * sysfs_deactivate - deactivate sysfs_dirent
96 * @sd: sysfs_dirent to deactivate
97 *
98 * Deny new active references and drain existing ones. s_active
99 * will be unlocked when the sysfs_dirent is released.
100 */
101void sysfs_deactivate(struct sysfs_dirent *sd)
102{
103 down_write_nested(&sd->s_active, SYSFS_S_ACTIVE_DEACTIVATE);
104
105 /* s_active will be unlocked by the thread doing the final put
106 * on @sd. Lie to lockdep.
107 */
108 rwsem_release(&sd->s_active.dep_map, 1, _RET_IP_);
109}
110
23static int sysfs_alloc_ino(ino_t *pino) 111static int sysfs_alloc_ino(ino_t *pino)
24{ 112{
25 int ino, rc; 113 int ino, rc;
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index 627bf3940dfa..f8779eaa53ff 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -56,6 +56,12 @@ enum sysfs_s_active_class
56extern struct vfsmount * sysfs_mount; 56extern struct vfsmount * sysfs_mount;
57extern struct kmem_cache *sysfs_dir_cachep; 57extern struct kmem_cache *sysfs_dir_cachep;
58 58
59extern struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd);
60extern void sysfs_put_active(struct sysfs_dirent *sd);
61extern struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd);
62extern void sysfs_put_active_two(struct sysfs_dirent *sd);
63extern void sysfs_deactivate(struct sysfs_dirent *sd);
64
59extern void sysfs_delete_inode(struct inode *inode); 65extern void sysfs_delete_inode(struct inode *inode);
60extern void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode); 66extern void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode);
61extern struct inode * sysfs_get_inode(struct sysfs_dirent *sd); 67extern struct inode * sysfs_get_inode(struct sysfs_dirent *sd);
@@ -104,94 +110,6 @@ static inline void sysfs_put(struct sysfs_dirent * sd)
104 release_sysfs_dirent(sd); 110 release_sysfs_dirent(sd);
105} 111}
106 112
107/**
108 * sysfs_get_active - get an active reference to sysfs_dirent
109 * @sd: sysfs_dirent to get an active reference to
110 *
111 * Get an active reference of @sd. This function is noop if @sd
112 * is NULL.
113 *
114 * RETURNS:
115 * Pointer to @sd on success, NULL on failure.
116 */
117static inline struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd)
118{
119 if (sd) {
120 if (unlikely(!down_read_trylock(&sd->s_active)))
121 sd = NULL;
122 }
123 return sd;
124}
125
126/**
127 * sysfs_put_active - put an active reference to sysfs_dirent
128 * @sd: sysfs_dirent to put an active reference to
129 *
130 * Put an active reference to @sd. This function is noop if @sd
131 * is NULL.
132 */
133static inline void sysfs_put_active(struct sysfs_dirent *sd)
134{
135 if (sd)
136 up_read(&sd->s_active);
137}
138
139/**
140 * sysfs_get_active_two - get active references to sysfs_dirent and parent
141 * @sd: sysfs_dirent of interest
142 *
143 * Get active reference to @sd and its parent. Parent's active
144 * reference is grabbed first. This function is noop if @sd is
145 * NULL.
146 *
147 * RETURNS:
148 * Pointer to @sd on success, NULL on failure.
149 */
150static inline struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd)
151{
152 if (sd) {
153 if (sd->s_parent && unlikely(!sysfs_get_active(sd->s_parent)))
154 return NULL;
155 if (unlikely(!sysfs_get_active(sd))) {
156 sysfs_put_active(sd->s_parent);
157 return NULL;
158 }
159 }
160 return sd;
161}
162
163/**
164 * sysfs_put_active_two - put active references to sysfs_dirent and parent
165 * @sd: sysfs_dirent of interest
166 *
167 * Put active references to @sd and its parent. This function is
168 * noop if @sd is NULL.
169 */
170static inline void sysfs_put_active_two(struct sysfs_dirent *sd)
171{
172 if (sd) {
173 sysfs_put_active(sd);
174 sysfs_put_active(sd->s_parent);
175 }
176}
177
178/**
179 * sysfs_deactivate - deactivate sysfs_dirent
180 * @sd: sysfs_dirent to deactivate
181 *
182 * Deny new active references and drain existing ones. s_active
183 * will be unlocked when the sysfs_dirent is released.
184 */
185static inline void sysfs_deactivate(struct sysfs_dirent *sd)
186{
187 down_write_nested(&sd->s_active, SYSFS_S_ACTIVE_DEACTIVATE);
188
189 /* s_active will be unlocked by the thread doing the final put
190 * on @sd. Lie to lockdep.
191 */
192 rwsem_release(&sd->s_active.dep_map, 1, _RET_IP_);
193}
194
195static inline int sysfs_is_shadowed_inode(struct inode *inode) 113static inline int sysfs_is_shadowed_inode(struct inode *inode)
196{ 114{
197 return S_ISDIR(inode->i_mode) && inode->i_op->follow_link; 115 return S_ISDIR(inode->i_mode) && inode->i_op->follow_link;
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-28 20:08:49 -0500