diff options
Diffstat (limited to 'fs/sysfs')
| -rw-r--r-- | fs/sysfs/dir.c | 117 | ||||
| -rw-r--r-- | fs/sysfs/file.c | 41 | ||||
| -rw-r--r-- | fs/sysfs/group.c | 30 | ||||
| -rw-r--r-- | fs/sysfs/inode.c | 5 | ||||
| -rw-r--r-- | fs/sysfs/mount.c | 14 | ||||
| -rw-r--r-- | fs/sysfs/symlink.c | 16 | ||||
| -rw-r--r-- | fs/sysfs/sysfs.h | 22 |
7 files changed, 118 insertions, 127 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c index 8f2d577..0d806ef 100644 --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c @@ -240,10 +240,31 @@ static void sysfs_free_ino(unsigned int ino) spin_unlock(&sysfs_ino_lock); } -void release_sysfs_dirent(struct sysfs_dirent *sd) +/** + * kernfs_get - get a reference count on a sysfs_dirent + * @sd: the target sysfs_dirent + */ +void kernfs_get(struct sysfs_dirent *sd) +{ + if (sd) { + WARN_ON(!atomic_read(&sd->s_count)); + atomic_inc(&sd->s_count); + } +} +EXPORT_SYMBOL_GPL(kernfs_get); + +/** + * kernfs_put - put a reference count on a sysfs_dirent + * @sd: the target sysfs_dirent + * + * Put a reference count of @sd and destroy it if it reached zero. + */ +void kernfs_put(struct sysfs_dirent *sd) { struct sysfs_dirent *parent_sd; + if (!sd || !atomic_dec_and_test(&sd->s_count)) + return; repeat: /* Moving/renaming is always done while holding reference. * sd->s_parent won't change beneath us. @@ -255,7 +276,7 @@ void release_sysfs_dirent(struct sysfs_dirent *sd) parent_sd ? parent_sd->s_name : "", sd->s_name); if (sysfs_type(sd) == SYSFS_KOBJ_LINK) - sysfs_put(sd->s_symlink.target_sd); + kernfs_put(sd->s_symlink.target_sd); if (sysfs_type(sd) & SYSFS_COPY_NAME) kfree(sd->s_name); if (sd->s_iattr && sd->s_iattr->ia_secdata) @@ -269,6 +290,7 @@ void release_sysfs_dirent(struct sysfs_dirent *sd) if (sd && atomic_dec_and_test(&sd->s_count)) goto repeat; } +EXPORT_SYMBOL_GPL(kernfs_put); static int sysfs_dentry_delete(const struct dentry *dentry) { @@ -331,7 +353,7 @@ out_bad: static void sysfs_dentry_release(struct dentry *dentry) { - sysfs_put(dentry->d_fsdata); + kernfs_put(dentry->d_fsdata); } const struct dentry_operations sysfs_dentry_ops = { @@ -433,7 +455,8 @@ int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd, return -EINVAL; sd->s_hash = sysfs_name_hash(sd->s_name, sd->s_ns); - sd->s_parent = sysfs_get(parent_sd); + sd->s_parent = parent_sd; + kernfs_get(parent_sd); ret = sysfs_link_sibling(sd); if (ret) @@ -553,36 +576,33 @@ void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt) sysfs_deactivate(sd); sysfs_unmap_bin_file(sd); - sysfs_put(sd); + kernfs_put(sd); } } /** - * sysfs_find_dirent - find sysfs_dirent with the given name - * @parent_sd: sysfs_dirent to search under - * @name: name to look for - * @ns: the namespace tag to use - * - * Look for sysfs_dirent with name @name under @parent_sd. - * - * LOCKING: - * mutex_lock(sysfs_mutex) + * kernfs_find_ns - find sysfs_dirent with the given name + * @parent: sysfs_dirent to search under + * @name: name to look for + * @ns: the namespace tag to use * - * RETURNS: - * Pointer to sysfs_dirent if found, NULL if not. + * Look for sysfs_dirent with name @name under @parent. Returns pointer to + * the found sysfs_dirent on success, %NULL on failure. */ -struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd, - const unsigned char *name, - const void *ns) +static struct sysfs_dirent *kernfs_find_ns(struct sysfs_dirent *parent, + const unsigned char *name, + const void *ns) { - struct rb_node *node = parent_sd->s_dir.children.rb_node; - bool has_ns = parent_sd->s_flags & SYSFS_FLAG_NS; + struct rb_node *node = parent->s_dir.children.rb_node; + bool has_ns = parent->s_flags & SYSFS_FLAG_NS; unsigned int hash; + lockdep_assert_held(&sysfs_mutex); + if (has_ns != (bool)ns) { WARN(1, KERN_WARNING "sysfs: ns %s in '%s' for '%s'\n", has_ns ? "required" : "invalid", - parent_sd->s_name, name); + parent->s_name, name); return NULL; } @@ -604,34 +624,28 @@ struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd, } /** - * sysfs_get_dirent_ns - find and get sysfs_dirent with the given name - * @parent_sd: sysfs_dirent to search under - * @name: name to look for - * @ns: the namespace tag to use - * - * Look for sysfs_dirent with name @name under @parent_sd and get - * it if found. - * - * LOCKING: - * Kernel thread context (may sleep). Grabs sysfs_mutex. + * kernfs_find_and_get_ns - find and get sysfs_dirent with the given name + * @parent: sysfs_dirent to search under + * @name: name to look for + * @ns: the namespace tag to use * - * RETURNS: - * Pointer to sysfs_dirent if found, NULL if not. + * Look for sysfs_dirent with name @name under @parent and get a reference + * if found. This function may sleep and returns pointer to the found + * sysfs_dirent on success, %NULL on failure. */ -struct sysfs_dirent *sysfs_get_dirent_ns(struct sysfs_dirent *parent_sd, - const unsigned char *name, - const void *ns) +struct sysfs_dirent *kernfs_find_and_get_ns(struct sysfs_dirent *parent, + const char *name, const void *ns) { struct sysfs_dirent *sd; mutex_lock(&sysfs_mutex); - sd = sysfs_find_dirent(parent_sd, name, ns); - sysfs_get(sd); + sd = kernfs_find_ns(parent, name, ns); + kernfs_get(sd); mutex_unlock(&sysfs_mutex); return sd; } -EXPORT_SYMBOL_GPL(sysfs_get_dirent_ns); +EXPORT_SYMBOL_GPL(kernfs_find_and_get_ns); /** * kernfs_create_dir_ns - create a directory @@ -667,7 +681,7 @@ struct sysfs_dirent *kernfs_create_dir_ns(struct sysfs_dirent *parent, if (!rc) return sd; - sysfs_put(sd); + kernfs_put(sd); return ERR_PTR(rc); } @@ -716,14 +730,15 @@ static struct dentry *sysfs_lookup(struct inode *dir, struct dentry *dentry, if (parent_sd->s_flags & SYSFS_FLAG_NS) ns = sysfs_info(dir->i_sb)->ns; - sd = sysfs_find_dirent(parent_sd, dentry->d_name.name, ns); + sd = kernfs_find_ns(parent_sd, dentry->d_name.name, ns); /* no such entry */ if (!sd) { ret = ERR_PTR(-ENOENT); goto out_unlock; } - dentry->d_fsdata = sysfs_get(sd); + kernfs_get(sd); + dentry->d_fsdata = sd; /* attach dentry and inode */ inode = sysfs_get_inode(dir->i_sb, sd); @@ -859,7 +874,7 @@ int kernfs_remove_by_name_ns(struct sysfs_dirent *dir_sd, const char *name, sysfs_addrm_start(&acxt); - sd = sysfs_find_dirent(dir_sd, name, ns); + sd = kernfs_find_ns(dir_sd, name, ns); if (sd) __kernfs_remove(&acxt, sd); @@ -925,7 +940,7 @@ int kernfs_rename_ns(struct sysfs_dirent *sd, struct sysfs_dirent *new_parent, goto out; /* nothing to rename */ error = -EEXIST; - if (sysfs_find_dirent(new_parent, new_name, new_ns)) + if (kernfs_find_ns(new_parent, new_name, new_ns)) goto out; /* rename sysfs_dirent */ @@ -943,8 +958,8 @@ int kernfs_rename_ns(struct sysfs_dirent *sd, struct sysfs_dirent *new_parent, * Move to the appropriate place in the appropriate directories rbtree. */ sysfs_unlink_sibling(sd); - sysfs_get(new_parent); - sysfs_put(sd->s_parent); + kernfs_get(new_parent); + kernfs_put(sd->s_parent); sd->s_ns = new_ns; sd->s_hash = sysfs_name_hash(sd->s_name, sd->s_ns); sd->s_parent = new_parent; @@ -1000,7 +1015,7 @@ static inline unsigned char dt_type(struct sysfs_dirent *sd) static int sysfs_dir_release(struct inode *inode, struct file *filp) { - sysfs_put(filp->private_data); + kernfs_put(filp->private_data); return 0; } @@ -1011,7 +1026,7 @@ static struct sysfs_dirent *sysfs_dir_pos(const void *ns, int valid = !(pos->s_flags & SYSFS_FLAG_REMOVED) && pos->s_parent == parent_sd && hash == pos->s_hash; - sysfs_put(pos); + kernfs_put(pos); if (!valid) pos = NULL; } @@ -1075,8 +1090,10 @@ static int sysfs_readdir(struct file *file, struct dir_context *ctx) unsigned int type = dt_type(pos); int len = strlen(name); ino_t ino = pos->s_ino; + ctx->pos = pos->s_hash; - file->private_data = sysfs_get(pos); + file->private_data = pos; + kernfs_get(pos); mutex_unlock(&sysfs_mutex); if (!dir_emit(ctx, name, len, ino, type)) diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index e4eca28..7f0a79f 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -881,19 +881,19 @@ void sysfs_notify(struct kobject *k, const char *dir, const char *attr) struct sysfs_dirent *sd = k->sd, *tmp; if (sd && dir) - sd = sysfs_get_dirent(sd, dir); + sd = kernfs_find_and_get(sd, dir); else - sysfs_get(sd); + kernfs_get(sd); if (sd && attr) { - tmp = sysfs_get_dirent(sd, attr); - sysfs_put(sd); + tmp = kernfs_find_and_get(sd, attr); + kernfs_put(sd); sd = tmp; } if (sd) { kernfs_notify(sd); - sysfs_put(sd); + kernfs_put(sd); } } EXPORT_SYMBOL_GPL(sysfs_notify); @@ -1052,7 +1052,7 @@ struct sysfs_dirent *kernfs_create_file_ns_key(struct sysfs_dirent *parent, sysfs_addrm_finish(&acxt); if (rc) { - sysfs_put(sd); + kernfs_put(sd); return ERR_PTR(rc); } return sd; @@ -1106,16 +1106,18 @@ int sysfs_add_file_to_group(struct kobject *kobj, struct sysfs_dirent *dir_sd; int error; - if (group) - dir_sd = sysfs_get_dirent(kobj->sd, group); - else - dir_sd = sysfs_get(kobj->sd); + if (group) { + dir_sd = kernfs_find_and_get(kobj->sd, group); + } else { + dir_sd = kobj->sd; + kernfs_get(dir_sd); + } if (!dir_sd) return -ENOENT; error = sysfs_add_file(dir_sd, attr, false); - sysfs_put(dir_sd); + kernfs_put(dir_sd); return error; } @@ -1135,7 +1137,7 @@ int sysfs_chmod_file(struct kobject *kobj, const struct attribute *attr, struct iattr newattrs; int rc; - sd = sysfs_get_dirent(kobj->sd, attr->name); + sd = kernfs_find_and_get(kobj->sd, attr->name); if (!sd) return -ENOENT; @@ -1144,7 +1146,7 @@ int sysfs_chmod_file(struct kobject *kobj, const struct attribute *attr, rc = kernfs_setattr(sd, &newattrs); - sysfs_put(sd); + kernfs_put(sd); return rc; } EXPORT_SYMBOL_GPL(sysfs_chmod_file); @@ -1185,13 +1187,16 @@ void sysfs_remove_file_from_group(struct kobject *kobj, { struct sysfs_dirent *dir_sd; - if (group) - dir_sd = sysfs_get_dirent(kobj->sd, group); - else - dir_sd = sysfs_get(kobj->sd); + if (group) { + dir_sd = kernfs_find_and_get(kobj->sd, group); + } else { + dir_sd = kobj->sd; + kernfs_get(dir_sd); + } + if (dir_sd) { kernfs_remove_by_name(dir_sd, attr->name); - sysfs_put(dir_sd); + kernfs_put(dir_sd); } } EXPORT_SYMBOL_GPL(sysfs_remove_file_from_group); diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c index 9f65cd9..7177532 100644 --- a/fs/sysfs/group.c +++ b/fs/sysfs/group.c @@ -108,13 +108,13 @@ static int internal_create_group(struct kobject *kobj, int update, } } else sd = kobj->sd; - sysfs_get(sd); + kernfs_get(sd); error = create_files(sd, kobj, grp, update); if (error) { if (grp->name) kernfs_remove(sd); } - sysfs_put(sd); + kernfs_put(sd); return error; } @@ -208,21 +208,23 @@ void sysfs_remove_group(struct kobject *kobj, struct sysfs_dirent *sd; if (grp->name) { - sd = sysfs_get_dirent(dir_sd, grp->name); + sd = kernfs_find_and_get(dir_sd, grp->name); if (!sd) { WARN(!sd, KERN_WARNING "sysfs group %p not found for kobject '%s'\n", grp, kobject_name(kobj)); return; } - } else - sd = sysfs_get(dir_sd); + } else { + sd = dir_sd; + kernfs_get(sd); + } remove_files(sd, kobj, grp); if (grp->name) kernfs_remove(sd); - sysfs_put(sd); + kernfs_put(sd); } EXPORT_SYMBOL_GPL(sysfs_remove_group); @@ -263,7 +265,7 @@ int sysfs_merge_group(struct kobject *kobj, struct attribute *const *attr; int i; - dir_sd = sysfs_get_dirent(kobj->sd, grp->name); + dir_sd = kernfs_find_and_get(kobj->sd, grp->name); if (!dir_sd) return -ENOENT; @@ -273,7 +275,7 @@ int sysfs_merge_group(struct kobject *kobj, while (--i >= 0) kernfs_remove_by_name(dir_sd, (*--attr)->name); } - sysfs_put(dir_sd); + kernfs_put(dir_sd); return error; } @@ -290,11 +292,11 @@ void sysfs_unmerge_group(struct kobject *kobj, struct sysfs_dirent *dir_sd; struct attribute *const *attr; - dir_sd = sysfs_get_dirent(kobj->sd, grp->name); + dir_sd = kernfs_find_and_get(kobj->sd, grp->name); if (dir_sd) { for (attr = grp->attrs; *attr; ++attr) kernfs_remove_by_name(dir_sd, (*attr)->name); - sysfs_put(dir_sd); + kernfs_put(dir_sd); } } EXPORT_SYMBOL_GPL(sysfs_unmerge_group); @@ -312,12 +314,12 @@ int sysfs_add_link_to_group(struct kobject *kobj, const char *group_name, struct sysfs_dirent *dir_sd; int error = 0; - dir_sd = sysfs_get_dirent(kobj->sd, group_name); + dir_sd = kernfs_find_and_get(kobj->sd, group_name); if (!dir_sd) return -ENOENT; error = sysfs_create_link_sd(dir_sd, target, link_name); - sysfs_put(dir_sd); + kernfs_put(dir_sd); return error; } @@ -334,10 +336,10 @@ void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name, { struct sysfs_dirent *dir_sd; - dir_sd = sysfs_get_dirent(kobj->sd, group_name); + dir_sd = kernfs_find_and_get(kobj->sd, group_name); if (dir_sd) { kernfs_remove_by_name(dir_sd, link_name); - sysfs_put(dir_sd); + kernfs_put(dir_sd); } } EXPORT_SYMBOL_GPL(sysfs_remove_link_from_group); diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c index b3c717a..bfe4478 100644 --- a/fs/sysfs/inode.c +++ b/fs/sysfs/inode.c @@ -254,7 +254,8 @@ int sysfs_getattr(struct vfsmount *mnt, struct dentry *dentry, static void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode) { - inode->i_private = sysfs_get(sd); + kernfs_get(sd); + inode->i_private = sd; inode->i_mapping->a_ops = &sysfs_aops; inode->i_mapping->backing_dev_info = &sysfs_backing_dev_info; inode->i_op = &sysfs_inode_operations; @@ -321,7 +322,7 @@ void sysfs_evict_inode(struct inode *inode) truncate_inode_pages(&inode->i_data, 0); clear_inode(inode); - sysfs_put(sd); + kernfs_put(sd); } int sysfs_permission(struct inode *inode, int mask) diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c index 8c24bce..852d115 100644 --- a/fs/sysfs/mount.c +++ b/fs/sysfs/mount.c @@ -184,17 +184,3 @@ out_err: sysfs_dir_cachep = NULL; goto out; } - -#undef sysfs_get -struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd) -{ - return __sysfs_get(sd); -} -EXPORT_SYMBOL_GPL(sysfs_get); - -#undef sysfs_put -void sysfs_put(struct sysfs_dirent *sd) -{ - __sysfs_put(sd); -} -EXPORT_SYMBOL_GPL(sysfs_put); diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c index 76efeab..b137aa3 100644 --- a/fs/sysfs/symlink.c +++ b/fs/sysfs/symlink.c @@ -44,7 +44,7 @@ struct sysfs_dirent *kernfs_create_link(struct sysfs_dirent *parent, if (parent->s_flags & SYSFS_FLAG_NS) sd->s_ns = target->s_ns; sd->s_symlink.target_sd = target; - sysfs_get(target); /* ref owned by symlink */ + kernfs_get(target); /* ref owned by symlink */ sysfs_addrm_start(&acxt); error = sysfs_add_one(&acxt, sd, parent); @@ -53,7 +53,7 @@ struct sysfs_dirent *kernfs_create_link(struct sysfs_dirent *parent, if (!error) return sd; - sysfs_put(sd); + kernfs_put(sd); return ERR_PTR(error); } @@ -72,15 +72,17 @@ static int sysfs_do_create_link_sd(struct sysfs_dirent *parent_sd, * sysfs_remove_dir() for details. */ spin_lock(&sysfs_symlink_target_lock); - if (target->sd) - target_sd = sysfs_get(target->sd); + if (target->sd) { + target_sd = target->sd; + kernfs_get(target_sd); + } spin_unlock(&sysfs_symlink_target_lock); if (!target_sd) return -ENOENT; sd = kernfs_create_link(parent_sd, name, target_sd); - sysfs_put(target_sd); + kernfs_put(target_sd); if (!IS_ERR(sd)) return 0; @@ -216,7 +218,7 @@ int sysfs_rename_link_ns(struct kobject *kobj, struct kobject *targ, old_ns = targ->sd->s_ns; result = -ENOENT; - sd = sysfs_get_dirent_ns(parent_sd, old, old_ns); + sd = kernfs_find_and_get_ns(parent_sd, old, old_ns); if (!sd) goto out; @@ -229,7 +231,7 @@ int sysfs_rename_link_ns(struct kobject *kobj, struct kobject *targ, result = kernfs_rename_ns(sd, parent_sd, new, new_ns); out: - sysfs_put(sd); + kernfs_put(sd); return result; } EXPORT_SYMBOL_GPL(sysfs_rename_link_ns); diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h index e93f8b8..85315e2 100644 --- a/fs/sysfs/sysfs.h +++ b/fs/sysfs/sysfs.h @@ -141,30 +141,8 @@ int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd, struct sysfs_dirent *parent_sd); void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt); -struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd, - const unsigned char *name, - const void *ns); struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type); -void release_sysfs_dirent(struct sysfs_dirent *sd); - -static inline struct sysfs_dirent *__sysfs_get(struct sysfs_dirent *sd) -{ - if (sd) { - WARN_ON(!atomic_read(&sd->s_count)); - atomic_inc(&sd->s_count); - } - return sd; -} -#define sysfs_get(sd) __sysfs_get(sd) - -static inline void __sysfs_put(struct sysfs_dirent *sd) -{ - if (sd && atomic_dec_and_test(&sd->s_count)) - release_sysfs_dirent(sd); -} -#define sysfs_put(sd) __sysfs_put(sd) - /* * inode.c */ |
