static int sysfs_do_create_link(struct kobject *kobj, struct kobject *target,
const char *name, int warn)
{
struct sysfs_dirent *parent_sd = NULL;
struct sysfs_dirent *target_sd = NULL;
struct sysfs_dirent *sd = NULL;
struct sysfs_addrm_cxt acxt;
int error;
BUG_ON(!name);
if (!kobj)
parent_sd = &sysfs_root;
else
parent_sd = kobj->sd;
error = -EFAULT;
if (!parent_sd)
goto out_put;
/* target->sd can go away beneath us but is protected with
* sysfs_assoc_lock. Fetch target_sd from it.
*/
spin_lock(&sysfs_assoc_lock);
if (target->sd)
target_sd = sysfs_get(target->sd);
spin_unlock(&sysfs_assoc_lock);
error = -ENOENT;
if (!target_sd)
goto out_put;
error = -ENOMEM;
sd = sysfs_new_dirent(name, S_IFLNK|S_IRWXUGO, SYSFS_KOBJ_LINK);
if (!sd)
goto out_put;
sd->s_symlink.target_sd = target_sd;
target_sd = NULL; /* reference is now owned by the symlink */
sysfs_addrm_start(&acxt, parent_sd);
if (warn)
error = sysfs_add_one(&acxt, sd);
else
error = __sysfs_add_one(&acxt, sd);
sysfs_addrm_finish(&acxt);
if (error)
goto out_put;
return 0;
out_put:
sysfs_put(target_sd);
sysfs_put(sd);
return error;
}
static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd,
const char *name, struct sysfs_dirent **p_sd)
{
umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO;
struct sysfs_addrm_cxt acxt;
struct sysfs_dirent *sd;
/* allocate */
sd = sysfs_new_dirent(name, mode, SYSFS_DIR);
if (!sd)
return -ENOMEM;
sd->s_elem.dir.kobj = kobj;
/* link in */
sysfs_addrm_start(&acxt, parent_sd);
if (!sysfs_find_dirent(parent_sd, name)) {
sysfs_add_one(&acxt, sd);
sysfs_link_sibling(sd);
}
if (!sysfs_addrm_finish(&acxt)) {
sysfs_put(sd);
return -EEXIST;
}
*p_sd = sd;
return 0;
}
static void sysfs_dentry_iput(struct dentry *dentry, struct inode *inode)
{
struct sysfs_dirent * sd = dentry->d_fsdata;
sysfs_put(sd);
iput(inode);
}
/**
* sysfs_chmod_file - update the modified mode value on an object attribute.
* @kobj: object we're acting for.
* @attr: attribute descriptor.
* @mode: file permissions.
*
*/
int sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode)
{
struct sysfs_dirent *victim_sd = NULL;
struct dentry *victim = NULL;
struct inode * inode;
struct iattr newattrs;
int rc;
rc = -ENOENT;
victim_sd = sysfs_get_dirent(kobj->sd, attr->name);
if (!victim_sd)
goto out;
victim = sysfs_get_dentry(victim_sd);
if (IS_ERR(victim)) {
rc = PTR_ERR(victim);
victim = NULL;
goto out;
}
inode = victim->d_inode;
mutex_lock(&inode->i_mutex);
newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
rc = notify_change(victim, &newattrs);
mutex_unlock(&inode->i_mutex);
out:
dput(victim);
sysfs_put(victim_sd);
return rc;
}
static int internal_create_group(struct kobject *kobj, int update,
const struct attribute_group *grp)
{
struct sysfs_dirent *sd;
int error;
BUG_ON(!kobj || (!update && !kobj->sd));
/* Updates may happen before the object has been instantiated */
if (unlikely(update && !kobj->sd))
return -EINVAL;
if (grp->name) {
error = sysfs_create_subdir(kobj, grp->name, &sd);
if (error)
return error;
} else
sd = kobj->sd;
sysfs_get(sd);
error = create_files(sd, kobj, grp, update);
if (error) {
if (grp->name)
sysfs_remove_subdir(sd);
}
sysfs_put(sd);
return error;
}
int sysfs_add_file(struct sysfs_dirent *dir_sd, const struct attribute *attr,
int type)
{
umode_t mode = (attr->mode & S_IALLUGO) | S_IFREG;
struct sysfs_addrm_cxt acxt;
struct sysfs_dirent *sd;
sd = sysfs_new_dirent(attr->name, mode, type);
if (!sd)
return -ENOMEM;
sd->s_elem.attr.attr = (void *)attr;
sysfs_addrm_start(&acxt, dir_sd);
if (!sysfs_find_dirent(dir_sd, attr->name)) {
sysfs_add_one(&acxt, sd);
sysfs_link_sibling(sd);
}
if (!sysfs_addrm_finish(&acxt)) {
sysfs_put(sd);
return -EEXIST;
}
return 0;
}
/**
* sysfs_addrm_finish - finish up sysfs_dirent add/remove
* @acxt: addrm context to finish up
*
* Finish up sysfs_dirent add/remove. Resources acquired by
* sysfs_addrm_start() are released and removed sysfs_dirents are
* cleaned up. Timestamps on the parent inode are updated.
*
* LOCKING:
* All mutexes acquired by sysfs_addrm_start() are released.
*
* RETURNS:
* Number of added/removed sysfs_dirents since sysfs_addrm_start().
*/
int sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt)
{
/* release resources acquired by sysfs_addrm_start() */
mutex_unlock(&sysfs_mutex);
if (acxt->parent_inode) {
struct inode *inode = acxt->parent_inode;
/* if added/removed, update timestamps on the parent */
if (acxt->cnt)
inode->i_ctime = inode->i_mtime = CURRENT_TIME;
mutex_unlock(&inode->i_mutex);
iput(inode);
}
/* kill removed sysfs_dirents */
while (acxt->removed) {
struct sysfs_dirent *sd = acxt->removed;
acxt->removed = sd->s_sibling;
sd->s_sibling = NULL;
sysfs_drop_dentry(sd);
sysfs_deactivate(sd);
sysfs_put(sd);
}
return acxt->cnt;
}
static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd,
enum kobj_ns_type type,
const char *name, const void *ns,
struct sysfs_dirent **p_sd)
{
umode_t mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO;
struct sysfs_addrm_cxt acxt;
struct sysfs_dirent *sd;
int rc;
/* allocate */
sd = sysfs_new_dirent(name, mode, SYSFS_DIR);
if (!sd)
return -ENOMEM;
sd->s_flags |= (type << SYSFS_NS_TYPE_SHIFT);
sd->s_ns = ns;
sd->s_dir.kobj = kobj;
/* link in */
sysfs_addrm_start(&acxt);
rc = sysfs_add_one(&acxt, sd, parent_sd);
sysfs_addrm_finish(&acxt);
if (rc == 0)
*p_sd = sd;
else
sysfs_put(sd);
return rc;
}
static struct sysfs_dirent *sysfs_dir_pos(const void *ns,
struct sysfs_dirent *parent_sd, loff_t hash, struct sysfs_dirent *pos)
{
if (pos) {
int valid = !(pos->s_flags & SYSFS_FLAG_REMOVED) &&
pos->s_parent == parent_sd &&
hash == pos->s_hash;
sysfs_put(pos);
if (!valid)
pos = NULL;
}
if (!pos && (hash > 1) && (hash < INT_MAX)) {
struct rb_node *node = parent_sd->s_dir.children.rb_node;
while (node) {
pos = to_sysfs_dirent(node);
if (hash < pos->s_hash)
node = node->rb_left;
else if (hash > pos->s_hash)
node = node->rb_right;
else
break;
}
}
/* Skip over entries in the wrong namespace */
while (pos && pos->s_ns != ns) {
struct rb_node *node = rb_next(&pos->s_rb);
if (!node)
pos = NULL;
else
pos = to_sysfs_dirent(node);
}
return pos;
}
void release_sysfs_dirent(struct sysfs_dirent *sd)
{
struct sysfs_dirent *parent_sd;
repeat:
/* Moving/renaming is always done while holding reference.
* sd->s_parent won't change beneath us.
*/
parent_sd = sd->s_parent;
WARN(!(sd->s_flags & SYSFS_FLAG_REMOVED),
"sysfs: free using entry: %s/%s\n",
parent_sd ? parent_sd->s_name : "", sd->s_name);
if (sysfs_type(sd) == SYSFS_KOBJ_LINK)
sysfs_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)
security_release_secctx(sd->s_iattr->ia_secdata,
sd->s_iattr->ia_secdata_len);
kfree(sd->s_iattr);
sysfs_free_ino(sd->s_ino);
kmem_cache_free(sysfs_dir_cachep, sd);
sd = parent_sd;
if (sd && atomic_dec_and_test(&sd->s_count))
goto repeat;
}
static int internal_create_group(struct kobject *kobj, int update,
const struct attribute_group *grp)
{
struct sysfs_dirent *sd;
int error;
BUG_ON(!kobj || (!update && !kobj->sd));
/* Updates may happen before the object has been instantiated */
if (unlikely(update && !kobj->sd))
return -EINVAL;
if (!grp->attrs && !grp->bin_attrs) {
WARN(1, "sysfs: (bin_)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)
return error;
} else
sd = kobj->sd;
sysfs_get(sd);
error = create_files(sd, kobj, grp, update);
if (error) {
if (grp->name)
sysfs_remove_subdir(sd);
}
sysfs_put(sd);
return error;
}
/**
* sysfs_update_file - update the modified timestamp on an object attribute.
* @kobj: object we're acting for.
* @attr: attribute descriptor.
*/
int sysfs_update_file(struct kobject * kobj, const struct attribute * attr)
{
struct sysfs_dirent *victim_sd = NULL;
struct dentry *victim = NULL;
int rc;
rc = -ENOENT;
victim_sd = sysfs_get_dirent(kobj->sd, attr->name);
if (!victim_sd)
goto out;
victim = sysfs_get_dentry(victim_sd);
if (IS_ERR(victim)) {
rc = PTR_ERR(victim);
victim = NULL;
goto out;
}
mutex_lock(&victim->d_inode->i_mutex);
victim->d_inode->i_mtime = CURRENT_TIME;
fsnotify_modify(victim);
mutex_unlock(&victim->d_inode->i_mutex);
rc = 0;
out:
dput(victim);
sysfs_put(victim_sd);
return rc;
}
/*
* The sysfs_dirent serves as both an inode and a directory entry for sysfs.
* To prevent the sysfs inode numbers from being freed prematurely we take a
* reference to sysfs_dirent from the sysfs inode. A
* super_operations.delete_inode() implementation is needed to drop that
* reference upon inode destruction.
*/
void sysfs_delete_inode(struct inode *inode)
{
struct sysfs_dirent *sd = inode->i_private;
truncate_inode_pages(&inode->i_data, 0);
clear_inode(inode);
sysfs_put(sd);
}
/*
* The sysfs_dirent serves as both an inode and a directory entry for sysfs.
* To prevent the sysfs inode numbers from being freed prematurely we take a
* reference to sysfs_dirent from the sysfs inode. A
* super_operations.evict_inode() implementation is needed to drop that
* reference upon inode destruction.
*/
void sysfs_evict_inode(struct inode *inode)
{
struct sysfs_dirent *sd = inode->i_private;
truncate_inode_pages(&inode->i_data, 0);
end_writeback(inode);
sysfs_put(sd);
}
/**
* sysfs_remove_file_from_group - remove an attribute file from a group.
* @kobj: object we're acting for.
* @attr: attribute descriptor.
* @group: group name.
*/
void sysfs_remove_file_from_group(struct kobject *kobj,
const struct attribute *attr, const char *group)
{
struct sysfs_dirent *dir_sd;
dir_sd = sysfs_get_dirent(kobj->sd, group);
if (dir_sd) {
sysfs_hash_and_remove(dir_sd, attr->name);
sysfs_put(dir_sd);
}
}
/**
* sysfs_remove_link_from_group - remove a symlink from an attribute group.
* @kobj: The kobject containing the group.
* @group_name: The name of the group.
* @link_name: The name of the symlink to remove.
*/
void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name,
const char *link_name)
{
struct sysfs_dirent *dir_sd;
dir_sd = sysfs_get_dirent(kobj->sd, NULL, group_name);
if (dir_sd) {
sysfs_hash_and_remove(dir_sd, NULL, link_name);
sysfs_put(dir_sd);
}
}
static void sysfs_d_iput(struct dentry * dentry, struct inode * inode)
{
struct sysfs_dirent * sd = dentry->d_fsdata;
if (sd) {
BUG_ON(sd->s_dentry != dentry);
sd->s_dentry = NULL;
sysfs_put(sd);
}
iput(inode);
}
static void
mic_remove(struct pci_dev *pdev)
{
int32_t brdnum;
bd_info_t *bd_info;
if (mic_data.dd_numdevs - 1 < 0)
return;
mic_data.dd_numdevs--;
brdnum = mic_data.dd_numdevs;
/* Make sure boards are shutdown and not available. */
bd_info = mic_data.dd_bi[brdnum];
spin_lock_bh(&bd_info->bi_ctx.sysfs_lock);
sysfs_put(bd_info->bi_ctx.sysfs_state);
bd_info->bi_ctx.sysfs_state = NULL;
spin_unlock_bh(&bd_info->bi_ctx.sysfs_lock);
if (bd_info->bi_ctx.bi_psmi.enabled) {
device_remove_bin_file(bd_info->bi_sysfsdev, &mic_psmi_ptes_attr);
sysfs_remove_group(&bd_info->bi_sysfsdev->kobj, &psmi_attr_group);
}
sysfs_remove_group(&bd_info->bi_sysfsdev->kobj, &bd_attr_group);
free_sysfs_entries(&bd_info->bi_ctx);
device_destroy(mic_lindata.dd_class,
mic_lindata.dd_dev + 2 + bd_info->bi_ctx.bi_id);
adapter_stop_device(&bd_info->bi_ctx, 1, 0);
/*
* Need to wait for reset since accessing the card while GDDR training
* is ongoing by adapter_remove(..) below for example can be fatal.
*/
wait_for_reset(&bd_info->bi_ctx);
mic_disable_interrupts(&bd_info->bi_ctx);
if (!bd_info->bi_ctx.msie) {
free_irq(bd_info->bi_ctx.bi_pdev->irq, &bd_info->bi_ctx);
#ifdef CONFIG_PCI_MSI
} else {
free_irq(bd_info->bi_msix_entries[0].vector, &bd_info->bi_ctx);
pci_disable_msix(bd_info->bi_ctx.bi_pdev);
#endif
}
adapter_remove(&bd_info->bi_ctx);
release_mem_region(bd_info->bi_ctx.aper.pa, bd_info->bi_ctx.aper.len);
release_mem_region(bd_info->bi_ctx.mmio.pa, bd_info->bi_ctx.mmio.len);
pci_disable_device(bd_info->bi_ctx.bi_pdev);
kfree(bd_info);
}
/**
* sysfs_unmerge_group - remove files from a pre-existing attribute group.
* @kobj: The kobject containing the group.
* @grp: The files to remove and the attribute group they belong to.
*/
void sysfs_unmerge_group(struct kobject *kobj,
const struct attribute_group *grp)
{
struct sysfs_dirent *dir_sd;
struct attribute *const *attr;
dir_sd = sysfs_get_dirent(kobj->sd, NULL, grp->name);
if (dir_sd) {
for (attr = grp->attrs; *attr; ++attr)
sysfs_hash_and_remove(dir_sd, NULL, (*attr)->name);
sysfs_put(dir_sd);
}
}
static int sysfs_release(struct inode * inode, struct file * filp)
{
struct sysfs_dirent *attr_sd = filp->f_path.dentry->d_fsdata;
struct sysfs_buffer *buffer = filp->private_data;
sysfs_put(attr_sd);
if (buffer) {
if (buffer->page)
free_page((unsigned long)buffer->page);
kfree(buffer);
}
return 0;
}
/**
* sysfs_add_link_to_group - add a symlink to an attribute group.
* @kobj: The kobject containing the group.
* @group_name: The name of the group.
* @target: The target kobject of the symlink to create.
* @link_name: The name of the symlink to create.
*/
int sysfs_add_link_to_group(struct kobject *kobj, const char *group_name,
struct kobject *target, const char *link_name)
{
struct sysfs_dirent *dir_sd;
int error = 0;
dir_sd = sysfs_get_dirent(kobj->sd, NULL, group_name);
if (!dir_sd)
return -ENOENT;
error = sysfs_create_link_sd(dir_sd, target, link_name);
sysfs_put(dir_sd);
return error;
}
/**
* sysfs_add_file_to_group - add an attribute file to a pre-existing group.
* @kobj: object we're acting for.
* @attr: attribute descriptor.
* @group: group name.
*/
int sysfs_add_file_to_group(struct kobject *kobj,
const struct attribute *attr, const char *group)
{
struct sysfs_dirent *dir_sd;
int error;
dir_sd = sysfs_get_dirent(kobj->sd, group);
if (!dir_sd)
return -ENOENT;
error = sysfs_add_file(dir_sd, attr, SYSFS_KOBJ_ATTR);
sysfs_put(dir_sd);
return error;
}
/**
* sysfs_addrm_finish - finish up sysfs_dirent add/remove
* @acxt: addrm context to finish up
*
* Finish up sysfs_dirent add/remove. Resources acquired by
* sysfs_addrm_start() are released and removed sysfs_dirents are
* cleaned up.
*
* LOCKING:
* sysfs_mutex is released.
*/
void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt)
{
/* release resources acquired by sysfs_addrm_start() */
mutex_unlock(&sysfs_mutex);
/* kill removed sysfs_dirents */
while (acxt->removed) {
struct sysfs_dirent *sd = acxt->removed;
acxt->removed = sd->s_sibling;
sd->s_sibling = NULL;
sysfs_deactivate(sd);
unmap_bin_file(sd);
sysfs_put(sd);
}
}
void sysfs_remove_group(struct kobject * kobj,
const struct attribute_group * grp)
{
struct sysfs_dirent *dir_sd = kobj->sd;
struct sysfs_dirent *sd;
if (grp->name) {
sd = sysfs_get_dirent(dir_sd, grp->name);
BUG_ON(!sd);
} else
sd = sysfs_get(dir_sd);
remove_files(sd, grp);
if (grp->name)
sysfs_remove_subdir(sd);
sysfs_put(sd);
}
static struct sysfs_dirent *sysfs_dir_pos(struct sysfs_dirent *parent_sd,
ino_t ino, struct sysfs_dirent *pos)
{
if (pos) {
int valid = !(pos->s_flags & SYSFS_FLAG_REMOVED) &&
pos->s_parent == parent_sd &&
ino == pos->s_ino;
sysfs_put(pos);
if (valid)
return pos;
}
pos = NULL;
if ((ino > 1) && (ino < INT_MAX)) {
pos = parent_sd->s_dir.children;
while (pos && (ino > pos->s_ino))
pos = pos->s_sibling;
}
return pos;
}
int sysfs_rename(struct sysfs_dirent *sd, struct sysfs_dirent *new_parent_sd,
const char *new_name, const void *new_ns)
{
int error;
mutex_lock(&sysfs_mutex);
error = 0;
if ((sd->s_parent == new_parent_sd) && (sd->s_ns == new_ns) &&
(strcmp(sd->s_name, new_name) == 0))
goto out; /* nothing to rename */
error = -EEXIST;
if (sysfs_find_dirent(new_parent_sd, new_name, new_ns))
goto out;
/* rename sysfs_dirent */
if (strcmp(sd->s_name, new_name) != 0) {
error = -ENOMEM;
new_name = kstrdup(new_name, GFP_KERNEL);
if (!new_name)
goto out;
kfree(sd->s_name);
sd->s_name = new_name;
}
/*
* Move to the appropriate place in the appropriate directories rbtree.
*/
sysfs_unlink_sibling(sd);
sysfs_get(new_parent_sd);
sysfs_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_sd;
sysfs_link_sibling(sd);
error = 0;
out:
mutex_unlock(&sysfs_mutex);
return error;
}
int sysfs_rename(struct sysfs_dirent *sd,
struct sysfs_dirent *new_parent_sd, const char *new_name)
{
const char *dup_name = NULL;
int error;
mutex_lock(&sysfs_mutex);
error = 0;
if ((sd->s_parent == new_parent_sd) &&
(strcmp(sd->s_name, new_name) == 0))
goto out; /* nothing to rename */
error = -EEXIST;
if (sysfs_find_dirent(new_parent_sd, new_name))
goto out;
/* rename sysfs_dirent */
if (strcmp(sd->s_name, new_name) != 0) {
error = -ENOMEM;
new_name = dup_name = kstrdup(new_name, GFP_KERNEL);
if (!new_name)
goto out;
dup_name = sd->s_name;
sd->s_name = new_name;
}
/* Remove from old parent's list and insert into new parent's list. */
if (sd->s_parent != new_parent_sd) {
sysfs_unlink_sibling(sd);
sysfs_get(new_parent_sd);
sysfs_put(sd->s_parent);
sd->s_parent = new_parent_sd;
sysfs_link_sibling(sd);
}
error = 0;
out:
mutex_unlock(&sysfs_mutex);
kfree(dup_name);
return error;
}
int sysfs_add_file(struct sysfs_dirent *dir_sd, const struct attribute *attr, int type)
{
umode_t mode = (attr->mode & S_IALLUGO) | S_IFREG;
struct sysfs_addrm_cxt acxt;
struct sysfs_dirent *sd;
int rc;
sd = sysfs_new_dirent(attr->name, mode, type);
if (!sd)
return -ENOMEM;
sd->s_attr.attr = (void *)attr;
sysfs_addrm_start(&acxt, dir_sd);
rc = sysfs_add_one(&acxt, sd);
sysfs_addrm_finish(&acxt);
if (rc)
sysfs_put(sd);
return rc;
}
/**
* sysfs_merge_group - merge files into a pre-existing attribute group.
* @kobj: The kobject containing the group.
* @grp: The files to create and the attribute group they belong to.
*
* This function returns an error if the group doesn't exist or any of the
* files already exist in that group, in which case none of the new files
* are created.
*/
int sysfs_merge_group(struct kobject *kobj,
const struct attribute_group *grp)
{
struct sysfs_dirent *dir_sd;
int error = 0;
struct attribute *const *attr;
int i;
dir_sd = sysfs_get_dirent(kobj->sd, NULL, grp->name);
if (!dir_sd)
return -ENOENT;
for ((i = 0, attr = grp->attrs); *attr && !error; (++i, ++attr))
error = sysfs_add_file(dir_sd, *attr, SYSFS_KOBJ_ATTR);
if (error) {
while (--i >= 0)
sysfs_hash_and_remove(dir_sd, NULL, (*--attr)->name);
}
sysfs_put(dir_sd);
return error;
}
void sysfs_remove_group(struct kobject * kobj,
const struct attribute_group * grp)
{
struct sysfs_dirent *dir_sd = kobj->sd;
struct sysfs_dirent *sd;
if (grp->name) {
sd = sysfs_get_dirent(dir_sd, NULL, 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);
remove_files(sd, kobj, grp);
if (grp->name)
sysfs_remove_subdir(sd);
sysfs_put(sd);
}
