/* lock down the parent dentry so we can peer at it */
parent = dget_parent(dentry);
- if (!parent->d_inode)
- goto out_bad;
-
dir = AFS_FS_I(parent->d_inode);
/* validate the parent directory */
out_bad:
/* don't unhash if we have submounts */
- if (check_submounts_and_drop(dentry) != 0)
- goto out_skip;
+ shrink_submounts_and_drop(dentry);
_debug("dropping dentry %s/%s",
parent->d_name.name, dentry->d_name.name);
* list is non-empty and continue searching.
*/
-/**
- * have_submounts - check for mounts over a dentry
- * @parent: dentry to check.
- *
- * Return true if the parent or its subdirectories contain
- * a mount point
- */
-
static enum d_walk_ret check_mount(void *data, struct dentry *dentry)
{
int *ret = data;
return D_WALK_CONTINUE;
}
+/**
+ * have_submounts - check for mounts over a dentry
+ * @parent: dentry to check.
+ *
+ * Return true if the parent or its subdirectories contain
+ * a mount point
+ */
int have_submounts(struct dentry *parent)
{
int ret = 0;
int ret = -ENOENT;
write_seqlock(&rename_lock);
for (p = dentry->d_parent; !IS_ROOT(p); p = p->d_parent) {
- /* Need exclusion wrt. check_submounts_and_drop() */
+ /* Need exclusion wrt. shrink_submounts_and_drop() */
spin_lock(&p->d_lock);
if (unlikely(d_unhashed(p))) {
spin_unlock(&p->d_lock);
}
EXPORT_SYMBOL(shrink_dcache_parent);
- static enum d_walk_ret check_and_collect(void *_data, struct dentry *dentry)
+ struct detach_data {
+ struct dentry *found;
+ };
+ static enum d_walk_ret do_detach_submounts(void *ptr, struct dentry *dentry)
{
- struct select_data *data = _data;
+ struct detach_data *data = ptr;
- if (d_mountpoint(dentry)) {
- data->found = -EBUSY;
- return D_WALK_QUIT;
- }
+ if (d_mountpoint(dentry))
+ data->found = dentry;
- return select_collect(_data, dentry);
- }
-
- static void check_and_drop(void *_data)
- {
- struct select_data *data = _data;
-
- if (d_mountpoint(data->start))
- data->found = -EBUSY;
- if (!data->found)
- __d_drop(data->start);
+ return data->found ? D_WALK_QUIT : D_WALK_CONTINUE;
}
/**
- * check_submounts_and_drop - prune dcache, check for submounts and drop
+ * detach_submounts - check for submounts and detach them.
*
- * All done as a single atomic operation relative to has_unlinked_ancestor().
- * Returns 0 if successfully unhashed @parent. If there were submounts then
- * return -EBUSY.
+ * @dentry: dentry to find mount points under.
*
- * @dentry: dentry to prune and drop
+ * If dentry or any of it's children is a mount point detach those mounts.
*/
- int check_submounts_and_drop(struct dentry *dentry)
+ void detach_submounts(struct dentry *dentry)
{
- int ret = 0;
-
- /* Negative dentries can be dropped without further checks */
- if (!dentry->d_inode) {
- d_drop(dentry);
- goto out;
- }
-
+ struct detach_data data;
for (;;) {
- struct select_data data;
-
- INIT_LIST_HEAD(&data.dispose);
- data.start = dentry;
- data.found = 0;
+ data.found = NULL;
+ d_walk(dentry, &data, do_detach_submounts, NULL);
- d_walk(dentry, &data, check_and_collect, check_and_drop);
- ret = data.found;
-
- if (!list_empty(&data.dispose))
- shrink_dentry_list(&data.dispose);
-
- if (ret <= 0)
+ if (!data.found)
break;
+ detach_mounts(data.found);
cond_resched();
}
+ detach_mounts(dentry);
+ }
- out:
- return ret;
+ /**
+ * shrink_submounts_and_drop - detach submounts, prune dcache, and drop
+ *
+ * All done as a single atomic operation reletaive to d_set_mounted().
+ *
+ * @dentry: dentry to detach, prune and drop
+ */
+ void shrink_submounts_and_drop(struct dentry *dentry)
+ {
+ d_drop(dentry);
+ detach_submounts(dentry);
+ shrink_dcache_parent(dentry);
}
- EXPORT_SYMBOL(check_submounts_and_drop);
+ EXPORT_SYMBOL(shrink_submounts_and_drop);
/**
* __d_alloc - allocate a dcache entry
EXPORT_SYMBOL(d_instantiate_unique);
+/**
+ * d_instantiate_no_diralias - instantiate a non-aliased dentry
+ * @entry: dentry to complete
+ * @inode: inode to attach to this dentry
+ *
+ * Fill in inode information in the entry. If a directory alias is found, then
+ * return an error. Together with d_materialise_unique() this guarantees that a
+ * directory inode may never have more than one alias.
+ */
+int d_instantiate_no_diralias(struct dentry *entry, struct inode *inode)
+{
+ BUG_ON(!hlist_unhashed(&entry->d_alias));
+
+ spin_lock(&inode->i_lock);
+ if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry)) {
+ spin_unlock(&inode->i_lock);
+ return -EBUSY;
+ }
+ __d_instantiate(entry, inode);
+ spin_unlock(&inode->i_lock);
+ security_d_instantiate(entry, inode);
+
+ return 0;
+}
+EXPORT_SYMBOL(d_instantiate_no_diralias);
+
struct dentry *d_make_root(struct inode *root_inode)
{
struct dentry *res = NULL;
struct inode *inode;
struct dentry *parent;
struct fuse_conn *fc;
+ struct fuse_inode *fi;
int ret;
inode = ACCESS_ONCE(entry->d_inode);
if (!err && !outarg.nodeid)
err = -ENOENT;
if (!err) {
- struct fuse_inode *fi = get_fuse_inode(inode);
+ fi = get_fuse_inode(inode);
if (outarg.nodeid != get_node_id(inode)) {
fuse_queue_forget(fc, forget, outarg.nodeid, 1);
goto invalid;
attr_version);
fuse_change_entry_timeout(entry, &outarg);
} else if (inode) {
- fc = get_fuse_conn(inode);
- if (fc->readdirplus_auto) {
+ fi = get_fuse_inode(inode);
+ if (flags & LOOKUP_RCU) {
+ if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state))
+ return -ECHILD;
+ } else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) {
parent = dget_parent(entry);
fuse_advise_use_readdirplus(parent->d_inode);
dput(parent);
invalid:
ret = 0;
- shrink_submounts_and_drop(entry);
+
- if (!(flags & LOOKUP_RCU) && check_submounts_and_drop(entry) != 0)
- ret = 1;
++ if (!(flags & LOOKUP_RCU))
++ shrink_submounts_and_drop(entry);
++
goto out;
}
return err;
}
-static struct dentry *fuse_materialise_dentry(struct dentry *dentry,
- struct inode *inode)
-{
- struct dentry *newent;
-
- if (inode && S_ISDIR(inode->i_mode)) {
- struct fuse_conn *fc = get_fuse_conn(inode);
-
- mutex_lock(&fc->inst_mutex);
- newent = d_materialise_unique(dentry, inode);
- mutex_unlock(&fc->inst_mutex);
- } else {
- newent = d_materialise_unique(dentry, inode);
- }
-
- return newent;
-}
-
static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
unsigned int flags)
{
if (inode && get_node_id(inode) == FUSE_ROOT_ID)
goto out_iput;
- newent = fuse_materialise_dentry(entry, inode);
+ newent = d_materialise_unique(entry, inode);
err = PTR_ERR(newent);
if (IS_ERR(newent))
goto out_err;
}
kfree(forget);
- if (S_ISDIR(inode->i_mode)) {
- struct dentry *alias;
- mutex_lock(&fc->inst_mutex);
- alias = d_find_alias(inode);
- if (alias) {
- /* New directory must have moved since mkdir */
- mutex_unlock(&fc->inst_mutex);
- dput(alias);
- iput(inode);
- return -EBUSY;
- }
- d_instantiate(entry, inode);
- mutex_unlock(&fc->inst_mutex);
- } else
- d_instantiate(entry, inode);
+ err = d_instantiate_no_diralias(entry, inode);
+ if (err) {
+ iput(inode);
+ return err;
+ }
fuse_change_entry_timeout(entry, &outarg);
fuse_invalidate_attr(dir);
struct fuse_access_in inarg;
int err;
+ BUG_ON(mask & MAY_NOT_BLOCK);
+
if (fc->no_access)
return 0;
noticed immediately, only after the attribute
timeout has expired */
} else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
- if (mask & MAY_NOT_BLOCK)
- return -ECHILD;
-
err = fuse_access(inode, mask);
} else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
if (!(inode->i_mode & S_IXUGO)) {
if (!inode)
goto out;
- alias = fuse_materialise_dentry(dentry, inode);
+ alias = d_materialise_unique(dentry, inode);
err = PTR_ERR(alias);
if (IS_ERR(alias))
goto out;
}
found:
+ if (fc->readdirplus_auto)
+ set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state);
fuse_change_entry_timeout(dentry, o);
err = 0;
* path_mountpoint - look up a path to be umounted
* @dfd: directory file descriptor to start walk from
* @name: full pathname to walk
+ * @path: pointer to container for result
* @flags: lookup flags
*
* Look up the given name, but don't attempt to revalidate the last component.
- * Returns 0 and "path" will be valid on success; Retuns error otherwise.
+ * Returns 0 and "path" will be valid on success; Returns error otherwise.
*/
static int
path_mountpoint(int dfd, const char *name, struct path *path, unsigned int flags)
spin_unlock(&dentry->d_lock);
}
+ static bool covered(struct vfsmount *mnt, struct dentry *dentry)
+ {
+ /* test to see if a dentry is covered with a mount in
+ * the current mount namespace.
+ */
+ bool is_covered;
+
+ rcu_read_lock();
+ is_covered = d_mountpoint(dentry) && __lookup_mnt(mnt, dentry, 1);
+ rcu_read_unlock();
+
+ return is_covered;
+ }
+
int vfs_rmdir(struct inode *dir, struct dentry *dentry)
{
int error = may_delete(dir, dentry, 1);
dget(dentry);
mutex_lock(&dentry->d_inode->i_mutex);
- error = -EBUSY;
- if (d_mountpoint(dentry))
- goto out;
-
error = security_inode_rmdir(dir, dentry);
if (error)
goto out;
dentry->d_inode->i_flags |= S_DEAD;
dont_mount(dentry);
+ detach_mounts(dentry);
out:
mutex_unlock(&dentry->d_inode->i_mutex);
error = -ENOENT;
goto exit3;
}
+ error = -EBUSY;
+ if (covered(nd.path.mnt, dentry))
+ goto exit3;
error = security_path_rmdir(&nd.path, dentry);
if (error)
goto exit3;
return -EPERM;
mutex_lock(&dentry->d_inode->i_mutex);
- if (d_mountpoint(dentry))
- error = -EBUSY;
- else {
- error = security_inode_unlink(dir, dentry);
+ error = security_inode_unlink(dir, dentry);
+ if (!error) {
+ error = dir->i_op->unlink(dir, dentry);
if (!error) {
- error = dir->i_op->unlink(dir, dentry);
- if (!error)
- dont_mount(dentry);
+ dont_mount(dentry);
+ detach_mounts(dentry);
}
}
mutex_unlock(&dentry->d_inode->i_mutex);
inode = dentry->d_inode;
if (!inode)
goto slashes;
+ error = -EBUSY;
+ if (covered(nd.path.mnt, dentry))
+ goto exit2;
ihold(inode);
error = security_path_unlink(&nd.path, dentry);
if (error)
if (target)
mutex_lock(&target->i_mutex);
- error = -EBUSY;
- if (d_mountpoint(old_dentry) || d_mountpoint(new_dentry))
- goto out;
-
error = -EMLINK;
if (max_links && !target && new_dir != old_dir &&
new_dir->i_nlink >= max_links)
if (target) {
target->i_flags |= S_DEAD;
dont_mount(new_dentry);
+ detach_mounts(new_dentry);
}
out:
if (target)
if (target)
mutex_lock(&target->i_mutex);
- error = -EBUSY;
- if (d_mountpoint(old_dentry)||d_mountpoint(new_dentry))
- goto out;
-
error = old_dir->i_op->rename(old_dir, old_dentry, new_dir, new_dentry);
if (error)
goto out;
- if (target)
+ if (target) {
dont_mount(new_dentry);
+ detach_mounts(new_dentry);
+ }
if (!(old_dir->i_sb->s_type->fs_flags & FS_RENAME_DOES_D_MOVE))
d_move(old_dentry, new_dentry);
out:
error = -ENOTEMPTY;
if (new_dentry == trap)
goto exit5;
+ error = -EBUSY;
+ if (covered(oldnd.path.mnt, old_dentry))
+ goto exit5;
+ if (covered(newnd.path.mnt, new_dentry))
+ goto exit5;
error = security_path_rename(&oldnd.path, old_dentry,
&newnd.path, new_dentry);
static struct list_head *mount_hashtable __read_mostly;
static struct list_head *mountpoint_hashtable __read_mostly;
static struct kmem_cache *mnt_cache __read_mostly;
-static struct rw_semaphore namespace_sem;
+static DECLARE_RWSEM(namespace_sem);
/* /sys/fs */
struct kobject *fs_kobj;
INIT_LIST_HEAD(&mnt->mnt_share);
INIT_LIST_HEAD(&mnt->mnt_slave_list);
INIT_LIST_HEAD(&mnt->mnt_slave);
+ INIT_LIST_HEAD(&mnt->mnt_mp_list);
#ifdef CONFIG_FSNOTIFY
INIT_HLIST_HEAD(&mnt->mnt_fsnotify_marks);
#endif
mp->m_dentry = dentry;
mp->m_count = 1;
list_add(&mp->m_hash, chain);
+ INIT_LIST_HEAD(&mp->m_list);
return mp;
}
{
if (!--mp->m_count) {
struct dentry *dentry = mp->m_dentry;
+ BUG_ON(!list_empty(&mp->m_list));
spin_lock(&dentry->d_lock);
dentry->d_flags &= ~DCACHE_MOUNTED;
spin_unlock(&dentry->d_lock);
mnt->mnt_mountpoint = mnt->mnt.mnt_root;
list_del_init(&mnt->mnt_child);
list_del_init(&mnt->mnt_hash);
+ list_del_init(&mnt->mnt_mp_list);
put_mountpoint(mnt->mnt_mp);
mnt->mnt_mp = NULL;
}
child_mnt->mnt_mountpoint = dget(mp->m_dentry);
child_mnt->mnt_parent = mnt;
child_mnt->mnt_mp = mp;
+ list_add_tail(&child_mnt->mnt_mp_list, &mp->m_list);
}
/*
list_del_init(&p->mnt_child);
if (mnt_has_parent(p)) {
p->mnt_parent->mnt_ghosts++;
+ list_del_init(&p->mnt_mp_list);
put_mountpoint(p->mnt_mp);
p->mnt_mp = NULL;
}
return retval;
}
+ void detach_mounts(struct dentry *dentry)
+ {
+ struct mountpoint *mp;
+ struct mount *mnt;
+
+ namespace_lock();
+ if (!d_mountpoint(dentry))
+ goto out_unlock;
+
+ mp = new_mountpoint(dentry);
+ if (IS_ERR(mp))
+ goto out_unlock;
+
+ br_write_lock(&vfsmount_lock);
+ while (!list_empty(&mp->m_list)) {
+ mnt = list_first_entry(&mp->m_list, struct mount, mnt_mp_list);
+ umount_tree(mnt, 1);
+ }
+ br_write_unlock(&vfsmount_lock);
+ put_mountpoint(mp);
+ out_unlock:
+ namespace_unlock();
+ }
+
/*
* Is the caller allowed to modify his namespace?
*/
br_write_lock(&vfsmount_lock);
mnt_flags |= mnt->mnt.mnt_flags & MNT_PROPAGATION_MASK;
mnt->mnt.mnt_flags = mnt_flags;
- br_write_unlock(&vfsmount_lock);
- }
- up_write(&sb->s_umount);
- if (!err) {
- br_write_lock(&vfsmount_lock);
touch_mnt_namespace(mnt->mnt_ns);
br_write_unlock(&vfsmount_lock);
}
+ up_write(&sb->s_umount);
return err;
}
return ERR_CAST(new);
}
new_ns->root = new;
- br_write_lock(&vfsmount_lock);
list_add_tail(&new_ns->list, &new->mnt_list);
- br_write_unlock(&vfsmount_lock);
/*
* Second pass: switch the tsk->fs->* elements and mark new vfsmounts
unsigned u;
int err;
- init_rwsem(&namespace_sem);
-
mnt_cache = kmem_cache_create("mnt_cache", sizeof(struct mount),
0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
{
if (!atomic_dec_and_test(&ns->count))
return;
- namespace_lock();
- br_write_lock(&vfsmount_lock);
- umount_tree(ns->root, 0);
- br_write_unlock(&vfsmount_lock);
- namespace_unlock();
+ drop_collected_mounts(&ns->root->mnt);
free_mnt_ns(ns);
}
if (unlikely(!ns))
return false;
- namespace_lock();
+ down_read(&namespace_sem);
list_for_each_entry(mnt, &ns->list, mnt_list) {
struct mount *child;
if (mnt->mnt.mnt_sb->s_type != type)
next: ;
}
found:
- namespace_unlock();
+ up_read(&namespace_sem);
return visible;
}
struct nfs_open_dir_context *ctx;
struct rpc_cred *cred;
- dfprintk(FILE, "NFS: open dir(%s/%s)\n",
- filp->f_path.dentry->d_parent->d_name.name,
- filp->f_path.dentry->d_name.name);
+ dfprintk(FILE, "NFS: open dir(%pD2)\n", filp);
nfs_inc_stats(inode, NFSIOS_VFSOPEN);
if (ctx->duped > 0
&& ctx->dup_cookie == *desc->dir_cookie) {
if (printk_ratelimit()) {
- pr_notice("NFS: directory %s/%s contains a readdir loop."
+ pr_notice("NFS: directory %pD2 contains a readdir loop."
"Please contact your server vendor. "
"The file: %s has duplicate cookie %llu\n",
- desc->file->f_dentry->d_parent->d_name.name,
- desc->file->f_dentry->d_name.name,
+ desc->file,
array->array[i].string.name,
*desc->dir_cookie);
}
struct nfs_open_dir_context *dir_ctx = file->private_data;
int res = 0;
- dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n",
- dentry->d_parent->d_name.name, dentry->d_name.name,
- (long long)ctx->pos);
+ dfprintk(FILE, "NFS: readdir(%pD2) starting at cookie %llu\n",
+ file, (long long)ctx->pos);
nfs_inc_stats(inode, NFSIOS_VFSGETDENTS);
/*
nfs_unblock_sillyrename(dentry);
if (res > 0)
res = 0;
- dfprintk(FILE, "NFS: readdir(%s/%s) returns %d\n",
- dentry->d_parent->d_name.name, dentry->d_name.name,
- res);
+ dfprintk(FILE, "NFS: readdir(%pD2) returns %d\n", file, res);
return res;
}
static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence)
{
- struct dentry *dentry = filp->f_path.dentry;
- struct inode *inode = dentry->d_inode;
+ struct inode *inode = file_inode(filp);
struct nfs_open_dir_context *dir_ctx = filp->private_data;
- dfprintk(FILE, "NFS: llseek dir(%s/%s, %lld, %d)\n",
- dentry->d_parent->d_name.name,
- dentry->d_name.name,
- offset, whence);
+ dfprintk(FILE, "NFS: llseek dir(%pD2, %lld, %d)\n",
+ filp, offset, whence);
mutex_lock(&inode->i_mutex);
switch (whence) {
static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end,
int datasync)
{
- struct dentry *dentry = filp->f_path.dentry;
- struct inode *inode = dentry->d_inode;
+ struct inode *inode = file_inode(filp);
- dfprintk(FILE, "NFS: fsync dir(%s/%s) datasync %d\n",
- dentry->d_parent->d_name.name, dentry->d_name.name,
- datasync);
+ dfprintk(FILE, "NFS: fsync dir(%pD2) datasync %d\n", filp, datasync);
mutex_lock(&inode->i_mutex);
- nfs_inc_stats(dentry->d_inode, NFSIOS_VFSFSYNC);
+ nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
mutex_unlock(&inode->i_mutex);
return 0;
}
}
if (is_bad_inode(inode)) {
- dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n",
- __func__, dentry->d_parent->d_name.name,
- dentry->d_name.name);
+ dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n",
+ __func__, dentry);
goto out_bad;
}
nfs_advise_use_readdirplus(dir);
out_valid_noent:
dput(parent);
- dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n",
- __func__, dentry->d_parent->d_name.name,
- dentry->d_name.name);
+ dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is valid\n",
+ __func__, dentry);
return 1;
out_zap_parent:
nfs_zap_caches(dir);
if (dentry->d_flags & DCACHE_DISCONNECTED)
goto out_valid;
}
- /* If we have submounts, don't unhash ! */
- if (check_submounts_and_drop(dentry) != 0)
- goto out_valid;
-
+ shrink_submounts_and_drop(dentry);
dput(parent);
- dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n",
- __func__, dentry->d_parent->d_name.name,
- dentry->d_name.name);
+ dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is invalid\n",
+ __func__, dentry);
return 0;
out_error:
nfs_free_fattr(fattr);
nfs_free_fhandle(fhandle);
nfs4_label_free(label);
dput(parent);
- dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n",
- __func__, dentry->d_parent->d_name.name,
- dentry->d_name.name, error);
+ dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) lookup returned error %d\n",
+ __func__, dentry, error);
return error;
}
* eventually need to do something more here.
*/
if (!inode) {
- dfprintk(LOOKUPCACHE, "%s: %s/%s has negative inode\n",
- __func__, dentry->d_parent->d_name.name,
- dentry->d_name.name);
+ dfprintk(LOOKUPCACHE, "%s: %pd2 has negative inode\n",
+ __func__, dentry);
return 1;
}
if (is_bad_inode(inode)) {
- dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n",
- __func__, dentry->d_parent->d_name.name,
- dentry->d_name.name);
+ dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n",
+ __func__, dentry);
return 0;
}
*/
static int nfs_dentry_delete(const struct dentry *dentry)
{
- dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n",
- dentry->d_parent->d_name.name, dentry->d_name.name,
- dentry->d_flags);
+ dfprintk(VFS, "NFS: dentry_delete(%pd2, %x)\n",
+ dentry, dentry->d_flags);
/* Unhash any dentry with a stale inode */
if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode))
struct nfs4_label *label = NULL;
int error;
- dfprintk(VFS, "NFS: lookup(%s/%s)\n",
- dentry->d_parent->d_name.name, dentry->d_name.name);
+ dfprintk(VFS, "NFS: lookup(%pd2)\n", dentry);
nfs_inc_stats(dir, NFSIOS_VFSLOOKUP);
res = ERR_PTR(-ENAMETOOLONG);
static int do_open(struct inode *inode, struct file *filp)
{
- nfs_fscache_set_inode_cookie(inode, filp);
+ nfs_fscache_open_file(inode, filp);
return 0;
}
/* Expect a negative dentry */
BUG_ON(dentry->d_inode);
- dfprintk(VFS, "NFS: atomic_open(%s/%ld), %s\n",
- dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
+ dfprintk(VFS, "NFS: atomic_open(%s/%ld), %pd\n",
+ dir->i_sb->s_id, dir->i_ino, dentry);
err = nfs_check_flags(open_flags);
if (err)
trace_nfs_atomic_open_enter(dir, ctx, open_flags);
nfs_block_sillyrename(dentry->d_parent);
- inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr);
+ inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr, opened);
nfs_unblock_sillyrename(dentry->d_parent);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT;
int error;
- dfprintk(VFS, "NFS: create(%s/%ld), %s\n",
- dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
+ dfprintk(VFS, "NFS: create(%s/%ld), %pd\n",
+ dir->i_sb->s_id, dir->i_ino, dentry);
attr.ia_mode = mode;
attr.ia_valid = ATTR_MODE;
struct iattr attr;
int status;
- dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n",
- dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
+ dfprintk(VFS, "NFS: mknod(%s/%ld), %pd\n",
+ dir->i_sb->s_id, dir->i_ino, dentry);
if (!new_valid_dev(rdev))
return -EINVAL;
struct iattr attr;
int error;
- dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n",
- dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
+ dfprintk(VFS, "NFS: mkdir(%s/%ld), %pd\n",
+ dir->i_sb->s_id, dir->i_ino, dentry);
attr.ia_valid = ATTR_MODE;
attr.ia_mode = mode | S_IFDIR;
{
int error;
- dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n",
- dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
+ dfprintk(VFS, "NFS: rmdir(%s/%ld), %pd\n",
+ dir->i_sb->s_id, dir->i_ino, dentry);
trace_nfs_rmdir_enter(dir, dentry);
if (dentry->d_inode) {
struct inode *inode = dentry->d_inode;
int error = -EBUSY;
- dfprintk(VFS, "NFS: safe_remove(%s/%s)\n",
- dentry->d_parent->d_name.name, dentry->d_name.name);
+ dfprintk(VFS, "NFS: safe_remove(%pd2)\n", dentry);
/* If the dentry was sillyrenamed, we simply call d_delete() */
if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
int error;
int need_rehash = 0;
- dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id,
- dir->i_ino, dentry->d_name.name);
+ dfprintk(VFS, "NFS: unlink(%s/%ld, %pd)\n", dir->i_sb->s_id,
+ dir->i_ino, dentry);
trace_nfs_unlink_enter(dir, dentry);
spin_lock(&dentry->d_lock);
unsigned int pathlen = strlen(symname);
int error;
- dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id,
- dir->i_ino, dentry->d_name.name, symname);
+ dfprintk(VFS, "NFS: symlink(%s/%ld, %pd, %s)\n", dir->i_sb->s_id,
+ dir->i_ino, dentry, symname);
if (pathlen > PAGE_SIZE)
return -ENAMETOOLONG;
error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr);
trace_nfs_symlink_exit(dir, dentry, error);
if (error != 0) {
- dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n",
+ dfprintk(VFS, "NFS: symlink(%s/%ld, %pd, %s) error %d\n",
dir->i_sb->s_id, dir->i_ino,
- dentry->d_name.name, symname, error);
+ dentry, symname, error);
d_drop(dentry);
__free_page(page);
return error;
struct inode *inode = old_dentry->d_inode;
int error;
- dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n",
- old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
- dentry->d_parent->d_name.name, dentry->d_name.name);
+ dfprintk(VFS, "NFS: link(%pd2 -> %pd2)\n",
+ old_dentry, dentry);
trace_nfs_link_enter(inode, dir, dentry);
NFS_PROTO(inode)->return_delegation(inode);
struct dentry *dentry = NULL, *rehash = NULL;
int error = -EBUSY;
- dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n",
- old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
- new_dentry->d_parent->d_name.name, new_dentry->d_name.name,
+ dfprintk(VFS, "NFS: rename(%pd2 -> %pd2, ct=%d)\n",
+ old_dentry, new_dentry,
d_count(new_dentry));
trace_nfs_rename_enter(old_dir, old_dentry, new_dir, new_dentry);
DEFINE_MUTEX(sysfs_mutex);
DEFINE_SPINLOCK(sysfs_assoc_lock);
-#define to_sysfs_dirent(X) rb_entry((X), struct sysfs_dirent, s_rb);
+#define to_sysfs_dirent(X) rb_entry((X), struct sysfs_dirent, s_rb)
static DEFINE_SPINLOCK(sysfs_ino_lock);
static DEFINE_IDA(sysfs_ino_ida);
/**
* sysfs_name_hash
- * @ns: Namespace tag to hash
* @name: Null terminated string to hash
+ * @ns: Namespace tag to hash
*
* Returns 31 bit hash of ns + name (so it fits in an off_t )
*/
-static unsigned int sysfs_name_hash(const void *ns, const char *name)
+static unsigned int sysfs_name_hash(const char *name, const void *ns)
{
unsigned long hash = init_name_hash();
unsigned int len = strlen(name);
return hash;
}
-static int sysfs_name_compare(unsigned int hash, const void *ns,
- const char *name, const struct sysfs_dirent *sd)
+static int sysfs_name_compare(unsigned int hash, const char *name,
+ const void *ns, const struct sysfs_dirent *sd)
{
if (hash != sd->s_hash)
return hash - sd->s_hash;
static int sysfs_sd_compare(const struct sysfs_dirent *left,
const struct sysfs_dirent *right)
{
- return sysfs_name_compare(left->s_hash, left->s_ns, left->s_name,
+ return sysfs_name_compare(left->s_hash, left->s_name, left->s_ns,
right);
}
/* add new node and rebalance the tree */
rb_link_node(&sd->s_rb, parent, node);
rb_insert_color(&sd->s_rb, &sd->s_parent->s_dir.children);
+
+ /* if @sd has ns tag, mark the parent to enable ns filtering */
+ if (sd->s_ns)
+ sd->s_parent->s_flags |= SYSFS_FLAG_HAS_NS;
+
return 0;
}
sd->s_parent->s_dir.subdirs--;
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;
+ /*
+ * Either all or none of the children have tags. Clearing HAS_NS
+ * when there's no child left is enough to keep the flag synced.
+ */
+ if (RB_EMPTY_ROOT(&sd->s_parent->s_dir.children))
+ sd->s_parent->s_flags &= ~SYSFS_FLAG_HAS_NS;
}
-#endif
-
/**
* sysfs_get_active - get an active reference to sysfs_dirent
* @sd: sysfs_dirent to get an active reference to
if (!atomic_inc_unless_negative(&sd->s_active))
return NULL;
- if (likely(!ignore_lockdep(sd)))
+ if (likely(!sysfs_ignore_lockdep(sd)))
rwsem_acquire_read(&sd->dep_map, 0, 1, _RET_IP_);
return sd;
}
if (unlikely(!sd))
return;
- if (likely(!ignore_lockdep(sd)))
+ if (likely(!sysfs_ignore_lockdep(sd)))
rwsem_release(&sd->dep_map, 1, _RET_IP_);
v = atomic_dec_return(&sd->s_active);
if (likely(v != SD_DEACTIVATED_BIAS))
static int sysfs_dentry_revalidate(struct dentry *dentry, unsigned int flags)
{
struct sysfs_dirent *sd;
- int type;
if (flags & LOOKUP_RCU)
return -ECHILD;
goto out_bad;
/* The sysfs dirent has been moved to a different namespace */
- type = KOBJ_NS_TYPE_NONE;
- if (sd->s_parent) {
- type = sysfs_ns_type(sd->s_parent);
- if (type != KOBJ_NS_TYPE_NONE &&
- sysfs_info(dentry->d_sb)->ns[type] != sd->s_ns)
- goto out_bad;
- }
+ if (sd->s_ns && sd->s_ns != sysfs_info(dentry->d_sb)->ns)
+ goto out_bad;
mutex_unlock(&sysfs_mutex);
- out_valid:
return 1;
out_bad:
/* Remove the dentry from the dcache hashes.
* to the dcache hashes.
*/
mutex_unlock(&sysfs_mutex);
-
- /* If we have submounts we must allow the vfs caches
- * to lie about the state of the filesystem to prevent
- * leaks and other nasty things.
- */
- if (check_submounts_and_drop(dentry) != 0)
- goto out_valid;
+ shrink_submounts_and_drop(dentry);
return 0;
}
/**
* sysfs_addrm_start - prepare for sysfs_dirent add/remove
* @acxt: pointer to sysfs_addrm_cxt to be used
- * @parent_sd: parent sysfs_dirent
*
- * This function is called when the caller is about to add or
- * remove sysfs_dirent under @parent_sd. This function acquires
- * sysfs_mutex. @acxt is used to keep and pass context to
- * other addrm functions.
+ * This function is called when the caller is about to add or remove
+ * sysfs_dirent. This function acquires sysfs_mutex. @acxt is used
+ * to keep and pass context to other addrm functions.
*
* LOCKING:
* Kernel thread context (may sleep). sysfs_mutex is locked on
* return.
*/
-void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
- struct sysfs_dirent *parent_sd)
+void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt)
+ __acquires(sysfs_mutex)
{
memset(acxt, 0, sizeof(*acxt));
- acxt->parent_sd = parent_sd;
mutex_lock(&sysfs_mutex);
}
* __sysfs_add_one - add sysfs_dirent to parent without warning
* @acxt: addrm context to use
* @sd: sysfs_dirent to be added
+ * @parent_sd: the parent sysfs_dirent to add @sd to
*
- * Get @acxt->parent_sd and set sd->s_parent to it and increment
- * nlink of parent inode if @sd is a directory and link into the
- * children list of the parent.
+ * Get @parent_sd and set @sd->s_parent to it and increment nlink of
+ * the parent inode if @sd is a directory and link into the children
+ * list of the parent.
*
* This function should be called between calls to
* sysfs_addrm_start() and sysfs_addrm_finish() and should be
* 0 on success, -EEXIST if entry with the given name already
* exists.
*/
-int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
+int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd,
+ struct sysfs_dirent *parent_sd)
{
struct sysfs_inode_attrs *ps_iattr;
int ret;
- if (!!sysfs_ns_type(acxt->parent_sd) != !!sd->s_ns) {
- WARN(1, KERN_WARNING "sysfs: ns %s in '%s' for '%s'\n",
- sysfs_ns_type(acxt->parent_sd) ? "required" : "invalid",
- acxt->parent_sd->s_name, sd->s_name);
- return -EINVAL;
- }
-
- sd->s_hash = sysfs_name_hash(sd->s_ns, sd->s_name);
- sd->s_parent = sysfs_get(acxt->parent_sd);
+ sd->s_hash = sysfs_name_hash(sd->s_name, sd->s_ns);
+ sd->s_parent = sysfs_get(parent_sd);
ret = sysfs_link_sibling(sd);
if (ret)
return ret;
/* Update timestamps on the parent */
- ps_iattr = acxt->parent_sd->s_iattr;
+ ps_iattr = parent_sd->s_iattr;
if (ps_iattr) {
struct iattr *ps_iattrs = &ps_iattr->ia_iattr;
ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME;
* sysfs_add_one - add sysfs_dirent to parent
* @acxt: addrm context to use
* @sd: sysfs_dirent to be added
+ * @parent_sd: the parent sysfs_dirent to add @sd to
*
- * Get @acxt->parent_sd and set sd->s_parent to it and increment
- * nlink of parent inode if @sd is a directory and link into the
- * children list of the parent.
+ * Get @parent_sd and set @sd->s_parent to it and increment nlink of
+ * the parent inode if @sd is a directory and link into the children
+ * list of the parent.
*
* This function should be called between calls to
* sysfs_addrm_start() and sysfs_addrm_finish() and should be
* 0 on success, -EEXIST if entry with the given name already
* exists.
*/
-int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
+int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd,
+ struct sysfs_dirent *parent_sd)
{
int ret;
- ret = __sysfs_add_one(acxt, sd);
+ ret = __sysfs_add_one(acxt, sd, parent_sd);
if (ret == -EEXIST) {
char *path = kzalloc(PATH_MAX, GFP_KERNEL);
WARN(1, KERN_WARNING
"sysfs: cannot create duplicate filename '%s'\n",
(path == NULL) ? sd->s_name
- : (sysfs_pathname(acxt->parent_sd, path),
+ : (sysfs_pathname(parent_sd, path),
strlcat(path, "/", PATH_MAX),
strlcat(path, sd->s_name, PATH_MAX),
path));
* LOCKING:
* Determined by sysfs_addrm_start().
*/
-void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
+static void sysfs_remove_one(struct sysfs_addrm_cxt *acxt,
+ struct sysfs_dirent *sd)
{
struct sysfs_inode_attrs *ps_iattr;
- BUG_ON(sd->s_flags & SYSFS_FLAG_REMOVED);
+ /*
+ * Removal can be called multiple times on the same node. Only the
+ * first invocation is effective and puts the base ref.
+ */
+ if (sd->s_flags & SYSFS_FLAG_REMOVED)
+ return;
sysfs_unlink_sibling(sd);
/* Update timestamps on the parent */
- ps_iattr = acxt->parent_sd->s_iattr;
+ ps_iattr = sd->s_parent->s_iattr;
if (ps_iattr) {
struct iattr *ps_iattrs = &ps_iattr->ia_iattr;
ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME;
* sysfs_mutex is released.
*/
void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt)
+ __releases(sysfs_mutex)
{
/* release resources acquired by sysfs_addrm_start() */
mutex_unlock(&sysfs_mutex);
acxt->removed = sd->u.removed_list;
sysfs_deactivate(sd);
- unmap_bin_file(sd);
+ sysfs_unmap_bin_file(sd);
sysfs_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.
*
* Pointer to sysfs_dirent if found, NULL if not.
*/
struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
- const void *ns,
- const unsigned char *name)
+ const unsigned char *name,
+ const void *ns)
{
struct rb_node *node = parent_sd->s_dir.children.rb_node;
unsigned int hash;
- if (!!sysfs_ns_type(parent_sd) != !!ns) {
- WARN(1, KERN_WARNING "sysfs: ns %s in '%s' for '%s'\n",
- sysfs_ns_type(parent_sd) ? "required" : "invalid",
- parent_sd->s_name, name);
- return NULL;
- }
-
- hash = sysfs_name_hash(ns, name);
+ hash = sysfs_name_hash(name, ns);
while (node) {
struct sysfs_dirent *sd;
int result;
sd = to_sysfs_dirent(node);
- result = sysfs_name_compare(hash, ns, name, sd);
+ result = sysfs_name_compare(hash, name, ns, sd);
if (result < 0)
node = node->rb_left;
else if (result > 0)
}
/**
- * sysfs_get_dirent - find and get sysfs_dirent with the given name
+ * 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.
* RETURNS:
* Pointer to sysfs_dirent if found, NULL if not.
*/
-struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
- const void *ns,
- const unsigned char *name)
+struct sysfs_dirent *sysfs_get_dirent_ns(struct sysfs_dirent *parent_sd,
+ const unsigned char *name,
+ const void *ns)
{
struct sysfs_dirent *sd;
mutex_lock(&sysfs_mutex);
- sd = sysfs_find_dirent(parent_sd, ns, name);
+ sd = sysfs_find_dirent(parent_sd, name, ns);
sysfs_get(sd);
mutex_unlock(&sysfs_mutex);
return sd;
}
-EXPORT_SYMBOL_GPL(sysfs_get_dirent);
+EXPORT_SYMBOL_GPL(sysfs_get_dirent_ns);
static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd,
- enum kobj_ns_type type, const void *ns, const char *name,
- struct sysfs_dirent **p_sd)
+ 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;
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, parent_sd);
- rc = sysfs_add_one(&acxt, sd);
+ sysfs_addrm_start(&acxt);
+ rc = sysfs_add_one(&acxt, sd, parent_sd);
sysfs_addrm_finish(&acxt);
if (rc == 0)
int sysfs_create_subdir(struct kobject *kobj, const char *name,
struct sysfs_dirent **p_sd)
{
- return create_dir(kobj, kobj->sd,
- KOBJ_NS_TYPE_NONE, NULL, name, p_sd);
+ return create_dir(kobj, kobj->sd, name, NULL, p_sd);
}
/**
- * sysfs_read_ns_type: return associated ns_type
- * @kobj: the kobject being queried
- *
- * Each kobject can be tagged with exactly one namespace type
- * (i.e. network or user). Return the ns_type associated with
- * this object if any
+ * sysfs_create_dir_ns - create a directory for an object with a namespace tag
+ * @kobj: object we're creating directory for
+ * @ns: the namespace tag to use
*/
-static enum kobj_ns_type sysfs_read_ns_type(struct kobject *kobj)
+int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
{
- const struct kobj_ns_type_operations *ops;
- enum kobj_ns_type type;
-
- ops = kobj_child_ns_ops(kobj);
- if (!ops)
- return KOBJ_NS_TYPE_NONE;
-
- type = ops->type;
- BUG_ON(type <= KOBJ_NS_TYPE_NONE);
- BUG_ON(type >= KOBJ_NS_TYPES);
- BUG_ON(!kobj_ns_type_registered(type));
-
- return type;
-}
-
-/**
- * sysfs_create_dir - create a directory for an object.
- * @kobj: object we're creating directory for.
- */
-int sysfs_create_dir(struct kobject *kobj)
-{
- enum kobj_ns_type type;
struct sysfs_dirent *parent_sd, *sd;
- const void *ns = NULL;
int error = 0;
BUG_ON(!kobj);
if (!parent_sd)
return -ENOENT;
- if (sysfs_ns_type(parent_sd))
- ns = kobj->ktype->namespace(kobj);
- type = sysfs_read_ns_type(kobj);
-
- error = create_dir(kobj, parent_sd, type, ns, kobject_name(kobj), &sd);
+ error = create_dir(kobj, parent_sd, kobject_name(kobj), ns, &sd);
if (!error)
kobj->sd = sd;
return error;
struct sysfs_dirent *parent_sd = parent->d_fsdata;
struct sysfs_dirent *sd;
struct inode *inode;
- enum kobj_ns_type type;
- const void *ns;
+ const void *ns = NULL;
mutex_lock(&sysfs_mutex);
- type = sysfs_ns_type(parent_sd);
- ns = sysfs_info(dir->i_sb)->ns[type];
+ if (parent_sd->s_flags & SYSFS_FLAG_HAS_NS)
+ ns = sysfs_info(dir->i_sb)->ns;
- sd = sysfs_find_dirent(parent_sd, ns, dentry->d_name.name);
+ sd = sysfs_find_dirent(parent_sd, dentry->d_name.name, ns);
/* no such entry */
if (!sd) {
.setxattr = sysfs_setxattr,
};
-static void remove_dir(struct sysfs_dirent *sd)
+static struct sysfs_dirent *sysfs_leftmost_descendant(struct sysfs_dirent *pos)
{
- struct sysfs_addrm_cxt acxt;
+ struct sysfs_dirent *last;
- sysfs_addrm_start(&acxt, sd->s_parent);
- sysfs_remove_one(&acxt, sd);
- sysfs_addrm_finish(&acxt);
+ while (true) {
+ struct rb_node *rbn;
+
+ last = pos;
+
+ if (sysfs_type(pos) != SYSFS_DIR)
+ break;
+
+ rbn = rb_first(&pos->s_dir.children);
+ if (!rbn)
+ break;
+
+ pos = to_sysfs_dirent(rbn);
+ }
+
+ return last;
}
-void sysfs_remove_subdir(struct sysfs_dirent *sd)
+/**
+ * sysfs_next_descendant_post - find the next descendant for post-order walk
+ * @pos: the current position (%NULL to initiate traversal)
+ * @root: sysfs_dirent whose descendants to walk
+ *
+ * Find the next descendant to visit for post-order traversal of @root's
+ * descendants. @root is included in the iteration and the last node to be
+ * visited.
+ */
+static struct sysfs_dirent *sysfs_next_descendant_post(struct sysfs_dirent *pos,
+ struct sysfs_dirent *root)
{
- remove_dir(sd);
-}
+ struct rb_node *rbn;
+
+ lockdep_assert_held(&sysfs_mutex);
+ /* if first iteration, visit leftmost descendant which may be root */
+ if (!pos)
+ return sysfs_leftmost_descendant(root);
+
+ /* if we visited @root, we're done */
+ if (pos == root)
+ return NULL;
-static void __sysfs_remove_dir(struct sysfs_dirent *dir_sd)
+ /* if there's an unvisited sibling, visit its leftmost descendant */
+ rbn = rb_next(&pos->s_rb);
+ if (rbn)
+ return sysfs_leftmost_descendant(to_sysfs_dirent(rbn));
+
+ /* no sibling left, visit parent */
+ return pos->s_parent;
+}
+
+void __sysfs_remove(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
{
- struct sysfs_addrm_cxt acxt;
- struct rb_node *pos;
+ struct sysfs_dirent *pos, *next;
- if (!dir_sd)
+ if (!sd)
return;
- pr_debug("sysfs %s: removing dir\n", dir_sd->s_name);
- sysfs_addrm_start(&acxt, dir_sd);
- pos = rb_first(&dir_sd->s_dir.children);
- while (pos) {
- struct sysfs_dirent *sd = to_sysfs_dirent(pos);
- pos = rb_next(pos);
- if (sysfs_type(sd) != SYSFS_DIR)
- sysfs_remove_one(&acxt, sd);
- }
- sysfs_addrm_finish(&acxt);
+ pr_debug("sysfs %s: removing\n", sd->s_name);
- remove_dir(dir_sd);
+ next = NULL;
+ do {
+ pos = next;
+ next = sysfs_next_descendant_post(pos, sd);
+ if (pos)
+ sysfs_remove_one(acxt, pos);
+ } while (next);
+}
+
+/**
+ * sysfs_remove - remove a sysfs_dirent recursively
+ * @sd: the sysfs_dirent to remove
+ *
+ * Remove @sd along with all its subdirectories and files.
+ */
+void sysfs_remove(struct sysfs_dirent *sd)
+{
+ struct sysfs_addrm_cxt acxt;
+
+ sysfs_addrm_start(&acxt);
+ __sysfs_remove(&acxt, sd);
+ sysfs_addrm_finish(&acxt);
}
/**
* the directory before we remove the directory, and we've inlined
* what used to be sysfs_rmdir() below, instead of calling separately.
*/
-
void sysfs_remove_dir(struct kobject *kobj)
{
struct sysfs_dirent *sd = kobj->sd;
kobj->sd = NULL;
spin_unlock(&sysfs_assoc_lock);
- __sysfs_remove_dir(sd);
+ if (sd) {
+ WARN_ON_ONCE(sysfs_type(sd) != SYSFS_DIR);
+ sysfs_remove(sd);
+ }
}
-int sysfs_rename(struct sysfs_dirent *sd,
- struct sysfs_dirent *new_parent_sd, const void *new_ns,
- const char *new_name)
+int sysfs_rename(struct sysfs_dirent *sd, struct sysfs_dirent *new_parent_sd,
+ const char *new_name, const void *new_ns)
{
int error;
goto out; /* nothing to rename */
error = -EEXIST;
- if (sysfs_find_dirent(new_parent_sd, new_ns, new_name))
+ if (sysfs_find_dirent(new_parent_sd, new_name, new_ns))
goto out;
/* rename sysfs_dirent */
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_hash = sysfs_name_hash(sd->s_name, sd->s_ns);
sd->s_parent = new_parent_sd;
sysfs_link_sibling(sd);
return error;
}
-int sysfs_rename_dir(struct kobject *kobj, const char *new_name)
+int sysfs_rename_dir_ns(struct kobject *kobj, const char *new_name,
+ const void *new_ns)
{
struct sysfs_dirent *parent_sd = kobj->sd->s_parent;
- const void *new_ns = NULL;
-
- if (sysfs_ns_type(parent_sd))
- new_ns = kobj->ktype->namespace(kobj);
- return sysfs_rename(kobj->sd, parent_sd, new_ns, new_name);
+ return sysfs_rename(kobj->sd, parent_sd, new_name, new_ns);
}
-int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent_kobj)
+int sysfs_move_dir_ns(struct kobject *kobj, struct kobject *new_parent_kobj,
+ const void *new_ns)
{
struct sysfs_dirent *sd = kobj->sd;
struct sysfs_dirent *new_parent_sd;
- const void *new_ns = NULL;
BUG_ON(!sd->s_parent);
- if (sysfs_ns_type(sd->s_parent))
- new_ns = kobj->ktype->namespace(kobj);
new_parent_sd = new_parent_kobj && new_parent_kobj->sd ?
new_parent_kobj->sd : &sysfs_root;
- return sysfs_rename(sd, new_parent_sd, new_ns, sd->s_name);
+ return sysfs_rename(sd, new_parent_sd, sd->s_name, new_ns);
}
/* Relationship between s_mode and the DT_xxx types */
struct dentry *dentry = file->f_path.dentry;
struct sysfs_dirent *parent_sd = dentry->d_fsdata;
struct sysfs_dirent *pos = file->private_data;
- enum kobj_ns_type type;
- const void *ns;
-
- type = sysfs_ns_type(parent_sd);
- ns = sysfs_info(dentry->d_sb)->ns[type];
+ const void *ns = NULL;
if (!dir_emit_dots(file, ctx))
return 0;
mutex_lock(&sysfs_mutex);
+
+ if (parent_sd->s_flags & SYSFS_FLAG_HAS_NS)
+ ns = sysfs_info(dentry->d_sb)->ns;
+
for (pos = sysfs_dir_pos(ns, parent_sd, ctx->pos, pos);
pos;
pos = sysfs_dir_next_pos(ns, parent_sd, ctx->pos, pos)) {
extern void d_instantiate(struct dentry *, struct inode *);
extern struct dentry * d_instantiate_unique(struct dentry *, struct inode *);
extern struct dentry * d_materialise_unique(struct dentry *, struct inode *);
+extern int d_instantiate_no_diralias(struct dentry *, struct inode *);
extern void __d_drop(struct dentry *dentry);
extern void d_drop(struct dentry *dentry);
extern void d_delete(struct dentry *);
/* test whether we have any submounts in a subdir tree */
extern int have_submounts(struct dentry *);
- extern int check_submounts_and_drop(struct dentry *);
+ extern void detach_submounts(struct dentry *dentry);
+ extern void shrink_submounts_and_drop(struct dentry *);
/*
* This adds the entry to the hash queues.
projects / karo-tx-linux.git / commitdiff