fuse: split out readdir.c

Directory reading code is about to grow larger, so split it out from dir.c
into a new source file.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

1 files changed, 2 insertions, 257 deletions

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 0979609d6eba..3a333b0ea9ad 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -16,22 +16,6 @@
 #include <linux/xattr.h>
 #include <linux/posix_acl.h>
 
-static bool fuse_use_readdirplus(struct inode *dir, struct dir_context *ctx)
-{
-	struct fuse_conn *fc = get_fuse_conn(dir);
-	struct fuse_inode *fi = get_fuse_inode(dir);
-
-	if (!fc->do_readdirplus)
-		return false;
-	if (!fc->readdirplus_auto)
-		return true;
-	if (test_and_clear_bit(FUSE_I_ADVISE_RDPLUS, &fi->state))
-		return true;
-	if (ctx->pos == 0)
-		return true;
-	return false;
-}
-
 static void fuse_advise_use_readdirplus(struct inode *dir)
 {
 	struct fuse_inode *fi = get_fuse_inode(dir);
@@ -80,8 +64,7 @@ static u64 time_to_jiffies(u64 sec, u32 nsec)
  * Set dentry and possibly attribute timeouts from the lookup/mk*
  * replies
  */
-static void fuse_change_entry_timeout(struct dentry *entry,
-				      struct fuse_entry_out *o)
+void fuse_change_entry_timeout(struct dentry *entry, struct fuse_entry_out *o)
 {
 	fuse_dentry_settime(entry,
 		time_to_jiffies(o->entry_valid, o->entry_valid_nsec));
@@ -92,7 +75,7 @@ static u64 attr_timeout(struct fuse_attr_out *o)
 	return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
 }
 
-static u64 entry_attr_timeout(struct fuse_entry_out *o)
+u64 entry_attr_timeout(struct fuse_entry_out *o)
 {
 	return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
 }
@@ -262,11 +245,6 @@ invalid:
 	goto out;
 }
 
-static int invalid_nodeid(u64 nodeid)
-{
-	return !nodeid || nodeid == FUSE_ROOT_ID;
-}
-
 static int fuse_dentry_init(struct dentry *dentry)
 {
 	dentry->d_fsdata = kzalloc(sizeof(union fuse_dentry), GFP_KERNEL);
@@ -1165,239 +1143,6 @@ static int fuse_permission(struct inode *inode, int mask)
 	return err;
 }
 
-static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
-			 struct dir_context *ctx)
-{
-	while (nbytes >= FUSE_NAME_OFFSET) {
-		struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
-		size_t reclen = FUSE_DIRENT_SIZE(dirent);
-		if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
-			return -EIO;
-		if (reclen > nbytes)
-			break;
-		if (memchr(dirent->name, '/', dirent->namelen) != NULL)
-			return -EIO;
-
-		if (!dir_emit(ctx, dirent->name, dirent->namelen,
-			       dirent->ino, dirent->type))
-			break;
-
-		buf += reclen;
-		nbytes -= reclen;
-		ctx->pos = dirent->off;
-	}
-
-	return 0;
-}
-
-static int fuse_direntplus_link(struct file *file,
-				struct fuse_direntplus *direntplus,
-				u64 attr_version)
-{
-	struct fuse_entry_out *o = &direntplus->entry_out;
-	struct fuse_dirent *dirent = &direntplus->dirent;
-	struct dentry *parent = file->f_path.dentry;
-	struct qstr name = QSTR_INIT(dirent->name, dirent->namelen);
-	struct dentry *dentry;
-	struct dentry *alias;
-	struct inode *dir = d_inode(parent);
-	struct fuse_conn *fc;
-	struct inode *inode;
-	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
-
-	if (!o->nodeid) {
-		/*
-		 * Unlike in the case of fuse_lookup, zero nodeid does not mean
-		 * ENOENT. Instead, it only means the userspace filesystem did
-		 * not want to return attributes/handle for this entry.
-		 *
-		 * So do nothing.
-		 */
-		return 0;
-	}
-
-	if (name.name[0] == '.') {
-		/*
-		 * We could potentially refresh the attributes of the directory
-		 * and its parent?
-		 */
-		if (name.len == 1)
-			return 0;
-		if (name.name[1] == '.' && name.len == 2)
-			return 0;
-	}
-
-	if (invalid_nodeid(o->nodeid))
-		return -EIO;
-	if (!fuse_valid_type(o->attr.mode))
-		return -EIO;
-
-	fc = get_fuse_conn(dir);
-
-	name.hash = full_name_hash(parent, name.name, name.len);
-	dentry = d_lookup(parent, &name);
-	if (!dentry) {
-retry:
-		dentry = d_alloc_parallel(parent, &name, &wq);
-		if (IS_ERR(dentry))
-			return PTR_ERR(dentry);
-	}
-	if (!d_in_lookup(dentry)) {
-		struct fuse_inode *fi;
-		inode = d_inode(dentry);
-		if (!inode ||
-		    get_node_id(inode) != o->nodeid ||
-		    ((o->attr.mode ^ inode->i_mode) & S_IFMT)) {
-			d_invalidate(dentry);
-			dput(dentry);
-			goto retry;
-		}
-		if (is_bad_inode(inode)) {
-			dput(dentry);
-			return -EIO;
-		}
-
-		fi = get_fuse_inode(inode);
-		spin_lock(&fc->lock);
-		fi->nlookup++;
-		spin_unlock(&fc->lock);
-
-		forget_all_cached_acls(inode);
-		fuse_change_attributes(inode, &o->attr,
-				       entry_attr_timeout(o),
-				       attr_version);
-		/*
-		 * The other branch comes via fuse_iget()
-		 * which bumps nlookup inside
-		 */
-	} else {
-		inode = fuse_iget(dir->i_sb, o->nodeid, o->generation,
-				  &o->attr, entry_attr_timeout(o),
-				  attr_version);
-		if (!inode)
-			inode = ERR_PTR(-ENOMEM);
-
-		alias = d_splice_alias(inode, dentry);
-		d_lookup_done(dentry);
-		if (alias) {
-			dput(dentry);
-			dentry = alias;
-		}
-		if (IS_ERR(dentry))
-			return PTR_ERR(dentry);
-	}
-	if (fc->readdirplus_auto)
-		set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state);
-	fuse_change_entry_timeout(dentry, o);
-
-	dput(dentry);
-	return 0;
-}
-
-static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file,
-			     struct dir_context *ctx, u64 attr_version)
-{
-	struct fuse_direntplus *direntplus;
-	struct fuse_dirent *dirent;
-	size_t reclen;
-	int over = 0;
-	int ret;
-
-	while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) {
-		direntplus = (struct fuse_direntplus *) buf;
-		dirent = &direntplus->dirent;
-		reclen = FUSE_DIRENTPLUS_SIZE(direntplus);
-
-		if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
-			return -EIO;
-		if (reclen > nbytes)
-			break;
-		if (memchr(dirent->name, '/', dirent->namelen) != NULL)
-			return -EIO;
-
-		if (!over) {
-			/* We fill entries into dstbuf only as much as
-			   it can hold. But we still continue iterating
-			   over remaining entries to link them. If not,
-			   we need to send a FORGET for each of those
-			   which we did not link.
-			*/
-			over = !dir_emit(ctx, dirent->name, dirent->namelen,
-				       dirent->ino, dirent->type);
-			if (!over)
-				ctx->pos = dirent->off;
-		}
-
-		buf += reclen;
-		nbytes -= reclen;
-
-		ret = fuse_direntplus_link(file, direntplus, attr_version);
-		if (ret)
-			fuse_force_forget(file, direntplus->entry_out.nodeid);
-	}
-
-	return 0;
-}
-
-static int fuse_readdir(struct file *file, struct dir_context *ctx)
-{
-	int plus, err;
-	size_t nbytes;
-	struct page *page;
-	struct inode *inode = file_inode(file);
-	struct fuse_conn *fc = get_fuse_conn(inode);
-	struct fuse_req *req;
-	u64 attr_version = 0;
-	bool locked;
-
-	if (is_bad_inode(inode))
-		return -EIO;
-
-	req = fuse_get_req(fc, 1);
-	if (IS_ERR(req))
-		return PTR_ERR(req);
-
-	page = alloc_page(GFP_KERNEL);
-	if (!page) {
-		fuse_put_request(fc, req);
-		return -ENOMEM;
-	}
-
-	plus = fuse_use_readdirplus(inode, ctx);
-	req->out.argpages = 1;
-	req->num_pages = 1;
-	req->pages[0] = page;
-	req->page_descs[0].length = PAGE_SIZE;
-	if (plus) {
-		attr_version = fuse_get_attr_version(fc);
-		fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
-			       FUSE_READDIRPLUS);
-	} else {
-		fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
-			       FUSE_READDIR);
-	}
-	locked = fuse_lock_inode(inode);
-	fuse_request_send(fc, req);
-	fuse_unlock_inode(inode, locked);
-	nbytes = req->out.args[0].size;
-	err = req->out.h.error;
-	fuse_put_request(fc, req);
-	if (!err) {
-		if (plus) {
-			err = parse_dirplusfile(page_address(page), nbytes,
-						file, ctx,
-						attr_version);
-		} else {
-			err = parse_dirfile(page_address(page), nbytes, file,
-					    ctx);
-		}
-	}
-
-	__free_page(page);
-	fuse_invalidate_atime(inode);
-	return err;
-}
-
 static const char *fuse_get_link(struct dentry *dentry,
 				 struct inode *inode,
 				 struct delayed_call *done)