#include <linux/poll.h>
#include <linux/reservation.h>
#include <linux/mm.h>
+#include <linux/mount.h>
++#include <linux/pseudo_fs.h>
#include <uapi/linux/dma-buf.h>
+#include <uapi/linux/magic.h>
static inline int is_dma_buf_file(struct file *);
static struct dma_buf_list db_list;
- static struct dentry *dma_buf_fs_mount(struct file_system_type *fs_type,
- int flags, const char *name, void *data)
+static char *dmabuffs_dname(struct dentry *dentry, char *buffer, int buflen)
+{
+ struct dma_buf *dmabuf;
+ char name[DMA_BUF_NAME_LEN];
+ size_t ret = 0;
+
+ dmabuf = dentry->d_fsdata;
+ mutex_lock(&dmabuf->lock);
+ if (dmabuf->name)
+ ret = strlcpy(name, dmabuf->name, DMA_BUF_NAME_LEN);
+ mutex_unlock(&dmabuf->lock);
+
+ return dynamic_dname(dentry, buffer, buflen, "/%s:%s",
+ dentry->d_name.name, ret > 0 ? name : "");
+}
+
+static const struct dentry_operations dma_buf_dentry_ops = {
+ .d_dname = dmabuffs_dname,
+};
+
+static struct vfsmount *dma_buf_mnt;
+
- return mount_pseudo(fs_type, "dmabuf:", NULL, &dma_buf_dentry_ops,
- DMA_BUF_MAGIC);
++static int dma_buf_fs_init_context(struct fs_context *fc)
+{
- .mount = dma_buf_fs_mount,
++ struct pseudo_fs_context *ctx;
++
++ ctx = init_pseudo(fc, DMA_BUF_MAGIC);
++ if (!ctx)
++ return -ENOMEM;
++ ctx->dops = &dma_buf_dentry_ops;
++ return 0;
+}
+
+static struct file_system_type dma_buf_fs_type = {
+ .name = "dmabuf",
++ .init_fs_context = dma_buf_fs_init_context,
+ .kill_sb = kill_anon_super,
+};
+
static int dma_buf_release(struct inode *inode, struct file *file)
{
struct dma_buf *dmabuf;
#include <linux/rwsem.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
+#include <linux/mount.h>
++#include <linux/pseudo_fs.h>
+#include <linux/balloon_compaction.h>
#include <linux/vmw_vmci_defs.h>
#include <linux/vmw_vmci_api.h>
#include <asm/hypervisor.h>
#endif /* CONFIG_DEBUG_FS */
- static struct dentry *vmballoon_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name,
- void *data)
+
+#ifdef CONFIG_BALLOON_COMPACTION
+
- static const struct dentry_operations ops = {
- .d_dname = simple_dname,
- };
-
- return mount_pseudo(fs_type, "balloon-vmware:", NULL, &ops,
- BALLOON_VMW_MAGIC);
++static int vmballoon_init_fs_context(struct fs_context *fc)
+{
- .name = "balloon-vmware",
- .mount = vmballoon_mount,
- .kill_sb = kill_anon_super,
++ return init_pseudo(fc, BALLOON_VMW_MAGIC) ? 0 : -ENOMEM;
+}
+
+static struct file_system_type vmballoon_fs = {
++ .name = "balloon-vmware",
++ .init_fs_context = vmballoon_init_fs_context,
++ .kill_sb = kill_anon_super,
+};
+
+static struct vfsmount *vmballoon_mnt;
+
+/**
+ * vmballoon_migratepage() - migrates a balloon page.
+ * @b_dev_info: balloon device information descriptor.
+ * @newpage: the page to which @page should be migrated.
+ * @page: a ballooned page that should be migrated.
+ * @mode: migration mode, ignored.
+ *
+ * This function is really open-coded, but that is according to the interface
+ * that balloon_compaction provides.
+ *
+ * Return: zero on success, -EAGAIN when migration cannot be performed
+ * momentarily, and -EBUSY if migration failed and should be retried
+ * with that specific page.
+ */
+static int vmballoon_migratepage(struct balloon_dev_info *b_dev_info,
+ struct page *newpage, struct page *page,
+ enum migrate_mode mode)
+{
+ unsigned long status, flags;
+ struct vmballoon *b;
+ int ret;
+
+ b = container_of(b_dev_info, struct vmballoon, b_dev_info);
+
+ /*
+ * If the semaphore is taken, there is ongoing configuration change
+ * (i.e., balloon reset), so try again.
+ */
+ if (!down_read_trylock(&b->conf_sem))
+ return -EAGAIN;
+
+ spin_lock(&b->comm_lock);
+ /*
+ * We must start by deflating and not inflating, as otherwise the
+ * hypervisor may tell us that it has enough memory and the new page is
+ * not needed. Since the old page is isolated, we cannot use the list
+ * interface to unlock it, as the LRU field is used for isolation.
+ * Instead, we use the native interface directly.
+ */
+ vmballoon_add_page(b, 0, page);
+ status = vmballoon_lock_op(b, 1, VMW_BALLOON_4K_PAGE,
+ VMW_BALLOON_DEFLATE);
+
+ if (status == VMW_BALLOON_SUCCESS)
+ status = vmballoon_status_page(b, 0, &page);
+
+ /*
+ * If a failure happened, let the migration mechanism know that it
+ * should not retry.
+ */
+ if (status != VMW_BALLOON_SUCCESS) {
+ spin_unlock(&b->comm_lock);
+ ret = -EBUSY;
+ goto out_unlock;
+ }
+
+ /*
+ * The page is isolated, so it is safe to delete it without holding
+ * @pages_lock . We keep holding @comm_lock since we will need it in a
+ * second.
+ */
+ balloon_page_delete(page);
+
+ put_page(page);
+
+ /* Inflate */
+ vmballoon_add_page(b, 0, newpage);
+ status = vmballoon_lock_op(b, 1, VMW_BALLOON_4K_PAGE,
+ VMW_BALLOON_INFLATE);
+
+ if (status == VMW_BALLOON_SUCCESS)
+ status = vmballoon_status_page(b, 0, &newpage);
+
+ spin_unlock(&b->comm_lock);
+
+ if (status != VMW_BALLOON_SUCCESS) {
+ /*
+ * A failure happened. While we can deflate the page we just
+ * inflated, this deflation can also encounter an error. Instead
+ * we will decrease the size of the balloon to reflect the
+ * change and report failure.
+ */
+ atomic64_dec(&b->size);
+ ret = -EBUSY;
+ } else {
+ /*
+ * Success. Take a reference for the page, and we will add it to
+ * the list after acquiring the lock.
+ */
+ get_page(newpage);
+ ret = MIGRATEPAGE_SUCCESS;
+ }
+
+ /* Update the balloon list under the @pages_lock */
+ spin_lock_irqsave(&b->b_dev_info.pages_lock, flags);
+
+ /*
+ * On inflation success, we already took a reference for the @newpage.
+ * If we succeed just insert it to the list and update the statistics
+ * under the lock.
+ */
+ if (ret == MIGRATEPAGE_SUCCESS) {
+ balloon_page_insert(&b->b_dev_info, newpage);
+ __count_vm_event(BALLOON_MIGRATE);
+ }
+
+ /*
+ * We deflated successfully, so regardless to the inflation success, we
+ * need to reduce the number of isolated_pages.
+ */
+ b->b_dev_info.isolated_pages--;
+ spin_unlock_irqrestore(&b->b_dev_info.pages_lock, flags);
+
+out_unlock:
+ up_read(&b->conf_sem);
+ return ret;
+}
+
+/**
+ * vmballoon_compaction_deinit() - removes compaction related data.
+ *
+ * @b: pointer to the balloon.
+ */
+static void vmballoon_compaction_deinit(struct vmballoon *b)
+{
+ if (!IS_ERR(b->b_dev_info.inode))
+ iput(b->b_dev_info.inode);
+
+ b->b_dev_info.inode = NULL;
+ kern_unmount(vmballoon_mnt);
+ vmballoon_mnt = NULL;
+}
+
+/**
+ * vmballoon_compaction_init() - initialized compaction for the balloon.
+ *
+ * @b: pointer to the balloon.
+ *
+ * If during the initialization a failure occurred, this function does not
+ * perform cleanup. The caller must call vmballoon_compaction_deinit() in this
+ * case.
+ *
+ * Return: zero on success or error code on failure.
+ */
+static __init int vmballoon_compaction_init(struct vmballoon *b)
+{
+ vmballoon_mnt = kern_mount(&vmballoon_fs);
+ if (IS_ERR(vmballoon_mnt))
+ return PTR_ERR(vmballoon_mnt);
+
+ b->b_dev_info.migratepage = vmballoon_migratepage;
+ b->b_dev_info.inode = alloc_anon_inode(vmballoon_mnt->mnt_sb);
+
+ if (IS_ERR(b->b_dev_info.inode))
+ return PTR_ERR(b->b_dev_info.inode);
+
+ b->b_dev_info.inode->i_mapping->a_ops = &balloon_aops;
+ return 0;
+}
+
+#else /* CONFIG_BALLOON_COMPACTION */
+
+static void vmballoon_compaction_deinit(struct vmballoon *b)
+{
+}
+
+static int vmballoon_compaction_init(struct vmballoon *b)
+{
+ return 0;
+}
+
+#endif /* CONFIG_BALLOON_COMPACTION */
+
static int __init vmballoon_init(void)
{
- enum vmballoon_page_size_type page_size;
int error;
/*
* populating the filesystem.
*/
- static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
+/* Basically copying rpc_get_inode. */
+static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
+{
+ struct inode *inode = new_inode(sb);
+ if (!inode)
+ return NULL;
+ /* Following advice from simple_fill_super documentation: */
+ inode->i_ino = iunique(sb, NFSD_MaxReserved);
+ inode->i_mode = mode;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
+ switch (mode & S_IFMT) {
+ case S_IFDIR:
+ inode->i_fop = &simple_dir_operations;
+ inode->i_op = &simple_dir_inode_operations;
+ inc_nlink(inode);
+ default:
+ break;
+ }
+ return inode;
+}
+
+static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+ struct inode *inode;
+
+ inode = nfsd_get_inode(dir->i_sb, mode);
+ if (!inode)
+ return -ENOMEM;
+ d_add(dentry, inode);
+ inc_nlink(dir);
+ fsnotify_mkdir(dir, dentry);
+ return 0;
+}
+
+static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
+{
+ struct inode *dir = parent->d_inode;
+ struct dentry *dentry;
+ int ret = -ENOMEM;
+
+ inode_lock(dir);
+ dentry = d_alloc_name(parent, name);
+ if (!dentry)
+ goto out_err;
+ ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600);
+ if (ret)
+ goto out_err;
+ if (ncl) {
+ d_inode(dentry)->i_private = ncl;
+ kref_get(&ncl->cl_ref);
+ }
+out:
+ inode_unlock(dir);
+ return dentry;
+out_err:
+ dentry = ERR_PTR(ret);
+ goto out;
+}
+
+static void clear_ncl(struct inode *inode)
+{
+ struct nfsdfs_client *ncl = inode->i_private;
+
+ inode->i_private = NULL;
+ synchronize_rcu();
+ kref_put(&ncl->cl_ref, ncl->cl_release);
+}
+
+
+static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode)
+{
+ struct nfsdfs_client *nc = inode->i_private;
+
+ if (nc)
+ kref_get(&nc->cl_ref);
+ return nc;
+}
+
+struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
+{
+ struct nfsdfs_client *nc;
+
+ rcu_read_lock();
+ nc = __get_nfsdfs_client(inode);
+ rcu_read_unlock();
+ return nc;
+}
+/* from __rpc_unlink */
+static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry)
+{
+ int ret;
+
+ clear_ncl(d_inode(dentry));
+ dget(dentry);
+ ret = simple_unlink(dir, dentry);
+ d_delete(dentry);
+ dput(dentry);
+ WARN_ON_ONCE(ret);
+}
+
+static void nfsdfs_remove_files(struct dentry *root)
+{
+ struct dentry *dentry, *tmp;
+
+ list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) {
+ if (!simple_positive(dentry)) {
+ WARN_ON_ONCE(1); /* I think this can't happen? */
+ continue;
+ }
+ nfsdfs_remove_file(d_inode(root), dentry);
+ }
+}
+
+/* XXX: cut'n'paste from simple_fill_super; figure out if we could share
+ * code instead. */
+static int nfsdfs_create_files(struct dentry *root,
+ const struct tree_descr *files)
+{
+ struct inode *dir = d_inode(root);
+ struct inode *inode;
+ struct dentry *dentry;
+ int i;
+
+ inode_lock(dir);
+ for (i = 0; files->name && files->name[0]; i++, files++) {
+ if (!files->name)
+ continue;
+ dentry = d_alloc_name(root, files->name);
+ if (!dentry)
+ goto out;
+ inode = nfsd_get_inode(d_inode(root)->i_sb,
+ S_IFREG | files->mode);
+ if (!inode) {
+ dput(dentry);
+ goto out;
+ }
+ inode->i_fop = files->ops;
+ inode->i_private = __get_nfsdfs_client(dir);
+ d_add(dentry, inode);
+ fsnotify_create(dir, dentry);
+ }
+ inode_unlock(dir);
+ return 0;
+out:
+ nfsdfs_remove_files(root);
+ inode_unlock(dir);
+ return -ENOMEM;
+}
+
+/* on success, returns positive number unique to that client. */
+struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
+ struct nfsdfs_client *ncl, u32 id,
+ const struct tree_descr *files)
+{
+ struct dentry *dentry;
+ char name[11];
+ int ret;
+
+ sprintf(name, "%u", id);
+
+ dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
+ if (IS_ERR(dentry)) /* XXX: tossing errors? */
+ return NULL;
+ ret = nfsdfs_create_files(dentry, files);
+ if (ret) {
+ nfsd_client_rmdir(dentry);
+ return NULL;
+ }
+ return dentry;
+}
+
+/* Taken from __rpc_rmdir: */
+void nfsd_client_rmdir(struct dentry *dentry)
+{
+ struct inode *dir = d_inode(dentry->d_parent);
+ struct inode *inode = d_inode(dentry);
+ int ret;
+
+ inode_lock(dir);
+ nfsdfs_remove_files(dentry);
+ clear_ncl(inode);
+ dget(dentry);
+ ret = simple_rmdir(dir, dentry);
+ WARN_ON_ONCE(ret);
+ d_delete(dentry);
+ inode_unlock(dir);
+}
+
+ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
{
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+ struct dentry *dentry;
+ int ret;
+
static const struct tree_descr nfsd_files[] = {
[NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
[NFSD_Export_features] = {"export_features",
#endif
/* last one */ {""}
};
- get_net(sb->s_fs_info);
+
- return simple_fill_super(sb, 0x6e667364, nfsd_files);
+ ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
+ if (ret)
+ return ret;
+ dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
+ if (IS_ERR(dentry))
+ return PTR_ERR(dentry);
+ nn->nfsd_client_dir = dentry;
+ return 0;
+ }
+ static int nfsd_fs_get_tree(struct fs_context *fc)
+ {
+ fc->s_fs_info = get_net(fc->net_ns);
+ return vfs_get_super(fc, vfs_get_keyed_super, nfsd_fill_super);
}
- static struct dentry *nfsd_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
+ static void nfsd_fs_free_fc(struct fs_context *fc)
{
- struct net *net = current->nsproxy->net_ns;
- return mount_ns(fs_type, flags, data, net, net->user_ns, nfsd_fill_super);
+ if (fc->s_fs_info)
+ put_net(fc->s_fs_info);
+ }
+
+ static const struct fs_context_operations nfsd_fs_context_ops = {
+ .free = nfsd_fs_free_fc,
+ .get_tree = nfsd_fs_get_tree,
+ };
+
+ static int nfsd_init_fs_context(struct fs_context *fc)
+ {
+ put_user_ns(fc->user_ns);
+ fc->user_ns = get_user_ns(fc->net_ns->user_ns);
+ fc->ops = &nfsd_fs_context_ops;
+ return 0;
}
static void nfsd_umount(struct super_block *sb)
#define UDF_SUPER_MAGIC 0x15013346
#define BALLOON_KVM_MAGIC 0x13661366
#define ZSMALLOC_MAGIC 0x58295829
+#define DMA_BUF_MAGIC 0x444d4142 /* "DMAB" */
+ #define Z3FOLD_MAGIC 0x33
#endif /* __LINUX_MAGIC_H__ */
projects / openwrt / staging / blogic.git / commitdiff