diff options
Diffstat (limited to 'fs/sysfs')
| -rw-r--r-- | fs/sysfs/dir.c | 42 | ||||
| -rw-r--r-- | fs/sysfs/group.c | 6 | ||||
| -rw-r--r-- | fs/sysfs/inode.c | 6 |
3 files changed, 40 insertions, 14 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c index 2a7a3f5d1ca6..e6bb9b2a4cbe 100644 --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c @@ -132,6 +132,24 @@ static void sysfs_unlink_sibling(struct sysfs_dirent *sd) rb_erase(&sd->s_rb, &sd->s_parent->s_dir.children); } +#ifdef CONFIG_DEBUG_LOCK_ALLOC + +/* Test for attributes that want to ignore lockdep for read-locking */ +static bool ignore_lockdep(struct sysfs_dirent *sd) +{ + return sysfs_type(sd) == SYSFS_KOBJ_ATTR && + sd->s_attr.attr->ignore_lockdep; +} + +#else + +static inline bool ignore_lockdep(struct sysfs_dirent *sd) +{ + return true; +} + +#endif + /** * sysfs_get_active - get an active reference to sysfs_dirent * @sd: sysfs_dirent to get an active reference to @@ -155,15 +173,17 @@ struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd) return NULL; t = atomic_cmpxchg(&sd->s_active, v, v + 1); - if (likely(t == v)) { - rwsem_acquire_read(&sd->dep_map, 0, 1, _RET_IP_); - return sd; - } + if (likely(t == v)) + break; if (t < 0) return NULL; cpu_relax(); } + + if (likely(!ignore_lockdep(sd))) + rwsem_acquire_read(&sd->dep_map, 0, 1, _RET_IP_); + return sd; } /** @@ -180,7 +200,8 @@ void sysfs_put_active(struct sysfs_dirent *sd) if (unlikely(!sd)) return; - rwsem_release(&sd->dep_map, 1, _RET_IP_); + if (likely(!ignore_lockdep(sd))) + rwsem_release(&sd->dep_map, 1, _RET_IP_); v = atomic_dec_return(&sd->s_active); if (likely(v != SD_DEACTIVATED_BIAS)) return; @@ -729,6 +750,9 @@ int sysfs_create_dir(struct kobject * kobj) else parent_sd = &sysfs_root; + if (!parent_sd) + return -ENOENT; + if (sysfs_ns_type(parent_sd)) ns = kobj->ktype->namespace(kobj); type = sysfs_read_ns_type(kobj); @@ -855,7 +879,6 @@ int sysfs_rename(struct sysfs_dirent *sd, struct sysfs_dirent *new_parent_sd, const void *new_ns, const char *new_name) { - const char *dup_name = NULL; int error; mutex_lock(&sysfs_mutex); @@ -872,13 +895,12 @@ int sysfs_rename(struct sysfs_dirent *sd, /* rename sysfs_dirent */ if (strcmp(sd->s_name, new_name) != 0) { error = -ENOMEM; - new_name = dup_name = kstrdup(new_name, GFP_KERNEL); + new_name = kstrdup(new_name, GFP_KERNEL); if (!new_name) goto out; - dup_name = sd->s_name; + kfree(sd->s_name); sd->s_name = new_name; - sd->s_hash = sysfs_name_hash(sd->s_ns, sd->s_name); } /* Move to the appropriate place in the appropriate directories rbtree. */ @@ -886,13 +908,13 @@ int sysfs_rename(struct sysfs_dirent *sd, sysfs_get(new_parent_sd); sysfs_put(sd->s_parent); sd->s_ns = new_ns; + sd->s_hash = sysfs_name_hash(sd->s_ns, sd->s_name); sd->s_parent = new_parent_sd; sysfs_link_sibling(sd); error = 0; out: mutex_unlock(&sysfs_mutex); - kfree(dup_name); return error; } diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c index dd1701caecc9..2df555c66d57 100644 --- a/fs/sysfs/group.c +++ b/fs/sysfs/group.c @@ -67,7 +67,11 @@ static int internal_create_group(struct kobject *kobj, int update, /* Updates may happen before the object has been instantiated */ if (unlikely(update && !kobj->sd)) return -EINVAL; - + if (!grp->attrs) { + WARN(1, "sysfs: attrs not set by subsystem for group: %s/%s\n", + kobj->name, grp->name ? "" : grp->name); + return -EINVAL; + } if (grp->name) { error = sysfs_create_subdir(kobj, grp->name, &sd); if (error) diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c index feb2d69396cf..0ce3ccf7f401 100644 --- a/fs/sysfs/inode.c +++ b/fs/sysfs/inode.c @@ -62,8 +62,8 @@ static struct sysfs_inode_attrs *sysfs_init_inode_attrs(struct sysfs_dirent *sd) /* assign default attributes */ iattrs->ia_mode = sd->s_mode; - iattrs->ia_uid = 0; - iattrs->ia_gid = 0; + iattrs->ia_uid = GLOBAL_ROOT_UID; + iattrs->ia_gid = GLOBAL_ROOT_GID; iattrs->ia_atime = iattrs->ia_mtime = iattrs->ia_ctime = CURRENT_TIME; return attrs; @@ -310,7 +310,7 @@ void sysfs_evict_inode(struct inode *inode) struct sysfs_dirent *sd = inode->i_private; truncate_inode_pages(&inode->i_data, 0); - end_writeback(inode); + clear_inode(inode); sysfs_put(sd); } |