diff options
Diffstat (limited to 'fs/sysfs')
| -rw-r--r-- | fs/sysfs/dir.c | 4 | ||||
| -rw-r--r-- | fs/sysfs/file.c | 35 | ||||
| -rw-r--r-- | fs/sysfs/sysfs.h | 32 |
3 files changed, 27 insertions, 44 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c index e88e9a94a08..8f2d577b5f6 100644 --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c @@ -150,7 +150,7 @@ struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd) if (!atomic_inc_unless_negative(&sd->s_active)) return NULL; - if (likely(!sysfs_ignore_lockdep(sd))) + if (sd->s_flags & SYSFS_FLAG_LOCKDEP) rwsem_acquire_read(&sd->dep_map, 0, 1, _RET_IP_); return sd; } @@ -169,7 +169,7 @@ void sysfs_put_active(struct sysfs_dirent *sd) if (unlikely(!sd)) return; - if (likely(!sysfs_ignore_lockdep(sd))) + if (sd->s_flags & SYSFS_FLAG_LOCKDEP) rwsem_release(&sd->dep_map, 1, _RET_IP_); v = atomic_dec_return(&sd->s_active); if (likely(v != SD_DEACTIVATED_BIAS)) diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index a68cbef3a67..e4eca285b39 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -58,7 +58,7 @@ static struct sysfs_open_file *sysfs_of(struct file *file) */ static const struct kernfs_ops *kernfs_ops(struct sysfs_dirent *sd) { - if (!sysfs_ignore_lockdep(sd)) + if (sd->s_flags & SYSFS_FLAG_LOCKDEP) lockdep_assert_held(sd); return sd->s_attr.ops; } @@ -71,7 +71,7 @@ static const struct sysfs_ops *sysfs_file_ops(struct sysfs_dirent *sd) { struct kobject *kobj = sd->s_parent->priv; - if (!sysfs_ignore_lockdep(sd)) + if (sd->s_flags & SYSFS_FLAG_LOCKDEP) lockdep_assert_held(sd); return kobj->ktype ? kobj->ktype->sysfs_ops : NULL; } @@ -942,6 +942,7 @@ int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd, const struct attribute *attr, bool is_bin, umode_t mode, const void *ns) { + struct lock_class_key *key = NULL; const struct kernfs_ops *ops; struct sysfs_dirent *sd; loff_t size; @@ -981,8 +982,12 @@ int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd, size = battr->size; } - sd = kernfs_create_file_ns(dir_sd, attr->name, mode, size, - ops, (void *)attr, ns); +#ifdef CONFIG_DEBUG_LOCK_ALLOC + if (!attr->ignore_lockdep) + key = attr->key ?: (struct lock_class_key *)&attr->skey; +#endif + sd = kernfs_create_file_ns_key(dir_sd, attr->name, mode, size, + ops, (void *)attr, ns, key); if (IS_ERR(sd)) { if (PTR_ERR(sd) == -EEXIST) sysfs_warn_dup(dir_sd, attr->name); @@ -992,7 +997,7 @@ int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd, } /** - * kernfs_create_file_ns - create a file + * kernfs_create_file_ns_key - create a file * @parent: directory to create the file in * @name: name of the file * @mode: mode of the file @@ -1000,14 +1005,16 @@ int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd, * @ops: kernfs operations for the file * @priv: private data for the file * @ns: optional namespace tag of the file + * @key: lockdep key for the file's active_ref, %NULL to disable lockdep * * Returns the created node on success, ERR_PTR() value on error. */ -struct sysfs_dirent *kernfs_create_file_ns(struct sysfs_dirent *parent, - const char *name, - umode_t mode, loff_t size, - const struct kernfs_ops *ops, - void *priv, const void *ns) +struct sysfs_dirent *kernfs_create_file_ns_key(struct sysfs_dirent *parent, + const char *name, + umode_t mode, loff_t size, + const struct kernfs_ops *ops, + void *priv, const void *ns, + struct lock_class_key *key) { struct sysfs_addrm_cxt acxt; struct sysfs_dirent *sd; @@ -1022,7 +1029,13 @@ struct sysfs_dirent *kernfs_create_file_ns(struct sysfs_dirent *parent, sd->s_attr.size = size; sd->s_ns = ns; sd->priv = priv; - sysfs_dirent_init_lockdep(sd); + +#ifdef CONFIG_DEBUG_LOCK_ALLOC + if (key) { + lockdep_init_map(&sd->dep_map, "s_active", key, 0); + sd->s_flags |= SYSFS_FLAG_LOCKDEP; + } +#endif /* * sd->s_attr.ops is accesible only while holding active ref. We diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h index c86456c9b19..e93f8b84561 100644 --- a/fs/sysfs/sysfs.h +++ b/fs/sysfs/sysfs.h @@ -92,43 +92,13 @@ struct sysfs_dirent { #define SYSFS_FLAG_NS 0x0020 #define SYSFS_FLAG_HAS_SEQ_SHOW 0x0040 #define SYSFS_FLAG_HAS_MMAP 0x0080 +#define SYSFS_FLAG_LOCKDEP 0x0100 static inline unsigned int sysfs_type(struct sysfs_dirent *sd) { return sd->s_flags & SYSFS_TYPE_MASK; } -#ifdef CONFIG_DEBUG_LOCK_ALLOC - -#define sysfs_dirent_init_lockdep(sd) \ -do { \ - struct attribute *attr = sd->priv; \ - struct lock_class_key *key = attr->key; \ - if (!key) \ - key = &attr->skey; \ - \ - lockdep_init_map(&sd->dep_map, "s_active", key, 0); \ -} while (0) - -/* Test for attributes that want to ignore lockdep for read-locking */ -static inline bool sysfs_ignore_lockdep(struct sysfs_dirent *sd) -{ - struct attribute *attr = sd->priv; - - return sysfs_type(sd) == SYSFS_KOBJ_ATTR && attr->ignore_lockdep; -} - -#else - -#define sysfs_dirent_init_lockdep(sd) do {} while (0) - -static inline bool sysfs_ignore_lockdep(struct sysfs_dirent *sd) -{ - return true; -} - -#endif - /* * Context structure to be used while adding/removing nodes. */ |