cachefiles: Delete the cachefiles driver pending rewrite

Delete the code from the cachefiles driver to make it easier to rewrite and
resubmit in a logical manner.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/163819577641.215744.12718114397770666596.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906883770.143852.4149714614981373410.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967076066.1823006.7175712134577687753.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021483619.640689.7586546280515844702.stgit@warthog.procyon.org.uk/ # v4

1 files changed, 0 insertions, 1018 deletions

diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
deleted file mode 100644
index a9aca5ab5970..000000000000
--- a/fs/cachefiles/namei.c
+++ /dev/null
@@ -1,1018 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* CacheFiles path walking and related routines
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/file.h>
-#include <linux/fs.h>
-#include <linux/fsnotify.h>
-#include <linux/quotaops.h>
-#include <linux/xattr.h>
-#include <linux/mount.h>
-#include <linux/namei.h>
-#include <linux/security.h>
-#include <linux/slab.h>
-#include "internal.h"
-
-#define CACHEFILES_KEYBUF_SIZE 512
-
-/*
- * dump debugging info about an object
- */
-static noinline
-void __cachefiles_printk_object(struct cachefiles_object *object,
-				const char *prefix)
-{
-	struct fscache_cookie *cookie;
-	const u8 *k;
-	unsigned loop;
-
-	pr_err("%sobject: OBJ%x\n", prefix, object->fscache.debug_id);
-	pr_err("%sobjstate=%s fl=%lx wbusy=%x ev=%lx[%lx]\n",
-	       prefix, object->fscache.state->name,
-	       object->fscache.flags, work_busy(&object->fscache.work),
-	       object->fscache.events, object->fscache.event_mask);
-	pr_err("%sops=%u inp=%u exc=%u\n",
-	       prefix, object->fscache.n_ops, object->fscache.n_in_progress,
-	       object->fscache.n_exclusive);
-	pr_err("%sparent=%x\n",
-	       prefix, object->fscache.parent ? object->fscache.parent->debug_id : 0);
-
-	spin_lock(&object->fscache.lock);
-	cookie = object->fscache.cookie;
-	if (cookie) {
-		pr_err("%scookie=%x [pr=%x nd=%p fl=%lx]\n",
-		       prefix,
-		       cookie->debug_id,
-		       cookie->parent ? cookie->parent->debug_id : 0,
-		       cookie->netfs_data,
-		       cookie->flags);
-		pr_err("%skey=[%u] '", prefix, cookie->key_len);
-		k = (cookie->key_len <= sizeof(cookie->inline_key)) ?
-			cookie->inline_key : cookie->key;
-		for (loop = 0; loop < cookie->key_len; loop++)
-			pr_cont("%02x", k[loop]);
-		pr_cont("'\n");
-	} else {
-		pr_err("%scookie=NULL\n", prefix);
-	}
-	spin_unlock(&object->fscache.lock);
-}
-
-/*
- * dump debugging info about a pair of objects
- */
-static noinline void cachefiles_printk_object(struct cachefiles_object *object,
-					      struct cachefiles_object *xobject)
-{
-	if (object)
-		__cachefiles_printk_object(object, "");
-	if (xobject)
-		__cachefiles_printk_object(xobject, "x");
-}
-
-/*
- * mark the owner of a dentry, if there is one, to indicate that that dentry
- * has been preemptively deleted
- * - the caller must hold the i_mutex on the dentry's parent as required to
- *   call vfs_unlink(), vfs_rmdir() or vfs_rename()
- */
-static void cachefiles_mark_object_buried(struct cachefiles_cache *cache,
-					  struct dentry *dentry,
-					  enum fscache_why_object_killed why)
-{
-	struct cachefiles_object *object;
-	struct rb_node *p;
-
-	_enter(",'%pd'", dentry);
-
-	write_lock(&cache->active_lock);
-
-	p = cache->active_nodes.rb_node;
-	while (p) {
-		object = rb_entry(p, struct cachefiles_object, active_node);
-		if (object->dentry > dentry)
-			p = p->rb_left;
-		else if (object->dentry < dentry)
-			p = p->rb_right;
-		else
-			goto found_dentry;
-	}
-
-	write_unlock(&cache->active_lock);
-	trace_cachefiles_mark_buried(NULL, dentry, why);
-	_leave(" [no owner]");
-	return;
-
-	/* found the dentry for  */
-found_dentry:
-	kdebug("preemptive burial: OBJ%x [%s] %pd",
-	       object->fscache.debug_id,
-	       object->fscache.state->name,
-	       dentry);
-
-	trace_cachefiles_mark_buried(object, dentry, why);
-
-	if (fscache_object_is_live(&object->fscache)) {
-		pr_err("\n");
-		pr_err("Error: Can't preemptively bury live object\n");
-		cachefiles_printk_object(object, NULL);
-	} else {
-		if (why != FSCACHE_OBJECT_IS_STALE)
-			fscache_object_mark_killed(&object->fscache, why);
-	}
-
-	write_unlock(&cache->active_lock);
-	_leave(" [owner marked]");
-}
-
-/*
- * record the fact that an object is now active
- */
-static int cachefiles_mark_object_active(struct cachefiles_cache *cache,
-					 struct cachefiles_object *object)
-{
-	struct cachefiles_object *xobject;
-	struct rb_node **_p, *_parent = NULL;
-	struct dentry *dentry;
-
-	_enter(",%x", object->fscache.debug_id);
-
-try_again:
-	write_lock(&cache->active_lock);
-
-	dentry = object->dentry;
-	trace_cachefiles_mark_active(object, dentry);
-
-	if (test_and_set_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags)) {
-		pr_err("Error: Object already active\n");
-		cachefiles_printk_object(object, NULL);
-		BUG();
-	}
-
-	_p = &cache->active_nodes.rb_node;
-	while (*_p) {
-		_parent = *_p;
-		xobject = rb_entry(_parent,
-				   struct cachefiles_object, active_node);
-
-		ASSERT(xobject != object);
-
-		if (xobject->dentry > dentry)
-			_p = &(*_p)->rb_left;
-		else if (xobject->dentry < dentry)
-			_p = &(*_p)->rb_right;
-		else
-			goto wait_for_old_object;
-	}
-
-	rb_link_node(&object->active_node, _parent, _p);
-	rb_insert_color(&object->active_node, &cache->active_nodes);
-
-	write_unlock(&cache->active_lock);
-	_leave(" = 0");
-	return 0;
-
-	/* an old object from a previous incarnation is hogging the slot - we
-	 * need to wait for it to be destroyed */
-wait_for_old_object:
-	trace_cachefiles_wait_active(object, dentry, xobject);
-	clear_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags);
-
-	if (fscache_object_is_live(&xobject->fscache)) {
-		pr_err("\n");
-		pr_err("Error: Unexpected object collision\n");
-		cachefiles_printk_object(object, xobject);
-	}
-	atomic_inc(&xobject->usage);
-	write_unlock(&cache->active_lock);
-
-	if (test_bit(CACHEFILES_OBJECT_ACTIVE, &xobject->flags)) {
-		wait_queue_head_t *wq;
-
-		signed long timeout = 60 * HZ;
-		wait_queue_entry_t wait;
-		bool requeue;
-
-		/* if the object we're waiting for is queued for processing,
-		 * then just put ourselves on the queue behind it */
-		if (work_pending(&xobject->fscache.work)) {
-			_debug("queue OBJ%x behind OBJ%x immediately",
-			       object->fscache.debug_id,
-			       xobject->fscache.debug_id);
-			goto requeue;
-		}
-
-		/* otherwise we sleep until either the object we're waiting for
-		 * is done, or the fscache_object is congested */
-		wq = bit_waitqueue(&xobject->flags, CACHEFILES_OBJECT_ACTIVE);
-		init_wait(&wait);
-		requeue = false;
-		do {
-			prepare_to_wait(wq, &wait, TASK_UNINTERRUPTIBLE);
-			if (!test_bit(CACHEFILES_OBJECT_ACTIVE, &xobject->flags))
-				break;
-
-			requeue = fscache_object_sleep_till_congested(&timeout);
-		} while (timeout > 0 && !requeue);
-		finish_wait(wq, &wait);
-
-		if (requeue &&
-		    test_bit(CACHEFILES_OBJECT_ACTIVE, &xobject->flags)) {
-			_debug("queue OBJ%x behind OBJ%x after wait",
-			       object->fscache.debug_id,
-			       xobject->fscache.debug_id);
-			goto requeue;
-		}
-
-		if (timeout <= 0) {
-			pr_err("\n");
-			pr_err("Error: Overlong wait for old active object to go away\n");
-			cachefiles_printk_object(object, xobject);
-			goto requeue;
-		}
-	}
-
-	ASSERT(!test_bit(CACHEFILES_OBJECT_ACTIVE, &xobject->flags));
-
-	cache->cache.ops->put_object(&xobject->fscache,
-		(enum fscache_obj_ref_trace)cachefiles_obj_put_wait_retry);
-	goto try_again;
-
-requeue:
-	cache->cache.ops->put_object(&xobject->fscache,
-		(enum fscache_obj_ref_trace)cachefiles_obj_put_wait_timeo);
-	_leave(" = -ETIMEDOUT");
-	return -ETIMEDOUT;
-}
-
-/*
- * Mark an object as being inactive.
- */
-void cachefiles_mark_object_inactive(struct cachefiles_cache *cache,
-				     struct cachefiles_object *object,
-				     blkcnt_t i_blocks)
-{
-	struct dentry *dentry = object->dentry;
-	struct inode *inode = d_backing_inode(dentry);
-
-	trace_cachefiles_mark_inactive(object, dentry, inode);
-
-	write_lock(&cache->active_lock);
-	rb_erase(&object->active_node, &cache->active_nodes);
-	clear_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags);
-	write_unlock(&cache->active_lock);
-
-	wake_up_bit(&object->flags, CACHEFILES_OBJECT_ACTIVE);
-
-	/* This object can now be culled, so we need to let the daemon know
-	 * that there is something it can remove if it needs to.
-	 */
-	atomic_long_add(i_blocks, &cache->b_released);
-	if (atomic_inc_return(&cache->f_released))
-		cachefiles_state_changed(cache);
-}
-
-/*
- * delete an object representation from the cache
- * - file backed objects are unlinked
- * - directory backed objects are stuffed into the graveyard for userspace to
- *   delete
- * - unlocks the directory mutex
- */
-static int cachefiles_bury_object(struct cachefiles_cache *cache,
-				  struct cachefiles_object *object,
-				  struct dentry *dir,
-				  struct dentry *rep,
-				  bool preemptive,
-				  enum fscache_why_object_killed why)
-{
-	struct dentry *grave, *trap;
-	struct path path, path_to_graveyard;
-	char nbuffer[8 + 8 + 1];
-	int ret;
-
-	_enter(",'%pd','%pd'", dir, rep);
-
-	/* non-directories can just be unlinked */
-	if (!d_is_dir(rep)) {
-		_debug("unlink stale object");
-
-		path.mnt = cache->mnt;
-		path.dentry = dir;
-		ret = security_path_unlink(&path, rep);
-		if (ret < 0) {
-			cachefiles_io_error(cache, "Unlink security error");
-		} else {
-			trace_cachefiles_unlink(object, rep, why);
-			ret = vfs_unlink(&init_user_ns, d_inode(dir), rep,
-					 NULL);
-
-			if (preemptive)
-				cachefiles_mark_object_buried(cache, rep, why);
-		}
-
-		inode_unlock(d_inode(dir));
-
-		if (ret == -EIO)
-			cachefiles_io_error(cache, "Unlink failed");
-
-		_leave(" = %d", ret);
-		return ret;
-	}
-
-	/* directories have to be moved to the graveyard */
-	_debug("move stale object to graveyard");
-	inode_unlock(d_inode(dir));
-
-try_again:
-	/* first step is to make up a grave dentry in the graveyard */
-	sprintf(nbuffer, "%08x%08x",
-		(uint32_t) ktime_get_real_seconds(),
-		(uint32_t) atomic_inc_return(&cache->gravecounter));
-
-	/* do the multiway lock magic */
-	trap = lock_rename(cache->graveyard, dir);
-
-	/* do some checks before getting the grave dentry */
-	if (rep->d_parent != dir || IS_DEADDIR(d_inode(rep))) {
-		/* the entry was probably culled when we dropped the parent dir
-		 * lock */
-		unlock_rename(cache->graveyard, dir);
-		_leave(" = 0 [culled?]");
-		return 0;
-	}
-
-	if (!d_can_lookup(cache->graveyard)) {
-		unlock_rename(cache->graveyard, dir);
-		cachefiles_io_error(cache, "Graveyard no longer a directory");
-		return -EIO;
-	}
-
-	if (trap == rep) {
-		unlock_rename(cache->graveyard, dir);
-		cachefiles_io_error(cache, "May not make directory loop");
-		return -EIO;
-	}
-
-	if (d_mountpoint(rep)) {
-		unlock_rename(cache->graveyard, dir);
-		cachefiles_io_error(cache, "Mountpoint in cache");
-		return -EIO;
-	}
-
-	grave = lookup_one_len(nbuffer, cache->graveyard, strlen(nbuffer));
-	if (IS_ERR(grave)) {
-		unlock_rename(cache->graveyard, dir);
-
-		if (PTR_ERR(grave) == -ENOMEM) {
-			_leave(" = -ENOMEM");
-			return -ENOMEM;
-		}
-
-		cachefiles_io_error(cache, "Lookup error %ld",
-				    PTR_ERR(grave));
-		return -EIO;
-	}
-
-	if (d_is_positive(grave)) {
-		unlock_rename(cache->graveyard, dir);
-		dput(grave);
-		grave = NULL;
-		cond_resched();
-		goto try_again;
-	}
-
-	if (d_mountpoint(grave)) {
-		unlock_rename(cache->graveyard, dir);
-		dput(grave);
-		cachefiles_io_error(cache, "Mountpoint in graveyard");
-		return -EIO;
-	}
-
-	/* target should not be an ancestor of source */
-	if (trap == grave) {
-		unlock_rename(cache->graveyard, dir);
-		dput(grave);
-		cachefiles_io_error(cache, "May not make directory loop");
-		return -EIO;
-	}
-
-	/* attempt the rename */
-	path.mnt = cache->mnt;
-	path.dentry = dir;
-	path_to_graveyard.mnt = cache->mnt;
-	path_to_graveyard.dentry = cache->graveyard;
-	ret = security_path_rename(&path, rep, &path_to_graveyard, grave, 0);
-	if (ret < 0) {
-		cachefiles_io_error(cache, "Rename security error %d", ret);
-	} else {
-		struct renamedata rd = {
-			.old_mnt_userns	= &init_user_ns,
-			.old_dir	= d_inode(dir),
-			.old_dentry	= rep,
-			.new_mnt_userns	= &init_user_ns,
-			.new_dir	= d_inode(cache->graveyard),
-			.new_dentry	= grave,
-		};
-		trace_cachefiles_rename(object, rep, grave, why);
-		ret = vfs_rename(&rd);
-		if (ret != 0 && ret != -ENOMEM)
-			cachefiles_io_error(cache,
-					    "Rename failed with error %d", ret);
-
-		if (preemptive)
-			cachefiles_mark_object_buried(cache, rep, why);
-	}
-
-	unlock_rename(cache->graveyard, dir);
-	dput(grave);
-	_leave(" = 0");
-	return 0;
-}
-
-/*
- * delete an object representation from the cache
- */
-int cachefiles_delete_object(struct cachefiles_cache *cache,
-			     struct cachefiles_object *object)
-{
-	struct dentry *dir;
-	int ret;
-
-	_enter(",OBJ%x{%pd}", object->fscache.debug_id, object->dentry);
-
-	ASSERT(object->dentry);
-	ASSERT(d_backing_inode(object->dentry));
-	ASSERT(object->dentry->d_parent);
-
-	dir = dget_parent(object->dentry);
-
-	inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
-
-	if (test_bit(FSCACHE_OBJECT_KILLED_BY_CACHE, &object->fscache.flags)) {
-		/* object allocation for the same key preemptively deleted this
-		 * object's file so that it could create its own file */
-		_debug("object preemptively buried");
-		inode_unlock(d_inode(dir));
-		ret = 0;
-	} else {
-		/* we need to check that our parent is _still_ our parent - it
-		 * may have been renamed */
-		if (dir == object->dentry->d_parent) {
-			ret = cachefiles_bury_object(cache, object, dir,
-						     object->dentry, false,
-						     FSCACHE_OBJECT_WAS_RETIRED);
-		} else {
-			/* it got moved, presumably by cachefilesd culling it,
-			 * so it's no longer in the key path and we can ignore
-			 * it */
-			inode_unlock(d_inode(dir));
-			ret = 0;
-		}
-	}
-
-	dput(dir);
-	_leave(" = %d", ret);
-	return ret;
-}
-
-/*
- * walk from the parent object to the child object through the backing
- * filesystem, creating directories as we go
- */
-int cachefiles_walk_to_object(struct cachefiles_object *parent,
-			      struct cachefiles_object *object,
-			      const char *key,
-			      struct cachefiles_xattr *auxdata)
-{
-	struct cachefiles_cache *cache;
-	struct dentry *dir, *next = NULL;
-	struct inode *inode;
-	struct path path;
-	const char *name;
-	int ret, nlen;
-
-	_enter("OBJ%x{%pd},OBJ%x,%s,",
-	       parent->fscache.debug_id, parent->dentry,
-	       object->fscache.debug_id, key);
-
-	cache = container_of(parent->fscache.cache,
-			     struct cachefiles_cache, cache);
-	path.mnt = cache->mnt;
-
-	ASSERT(parent->dentry);
-	ASSERT(d_backing_inode(parent->dentry));
-
-	if (!(d_is_dir(parent->dentry))) {
-		// TODO: convert file to dir
-		_leave("looking up in none directory");
-		return -ENOBUFS;
-	}
-
-	dir = dget(parent->dentry);
-
-advance:
-	/* attempt to transit the first directory component */
-	name = key;
-	nlen = strlen(key);
-
-	/* key ends in a double NUL */
-	key = key + nlen + 1;
-	if (!*key)
-		key = NULL;
-
-lookup_again:
-	/* search the current directory for the element name */
-	_debug("lookup '%s'", name);
-
-	inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
-
-	next = lookup_one_len(name, dir, nlen);
-	if (IS_ERR(next)) {
-		trace_cachefiles_lookup(object, next, NULL);
-		goto lookup_error;
-	}
-
-	inode = d_backing_inode(next);
-	trace_cachefiles_lookup(object, next, inode);
-	_debug("next -> %pd %s", next, inode ? "positive" : "negative");
-
-	if (!key)
-		object->new = !inode;
-
-	/* if this element of the path doesn't exist, then the lookup phase
-	 * failed, and we can release any readers in the certain knowledge that
-	 * there's nothing for them to actually read */
-	if (d_is_negative(next))
-		fscache_object_lookup_negative(&object->fscache);
-
-	/* we need to create the object if it's negative */
-	if (key || object->type == FSCACHE_COOKIE_TYPE_INDEX) {
-		/* index objects and intervening tree levels must be subdirs */
-		if (d_is_negative(next)) {
-			ret = cachefiles_has_space(cache, 1, 0);
-			if (ret < 0)
-				goto no_space_error;
-
-			path.dentry = dir;
-			ret = security_path_mkdir(&path, next, 0);
-			if (ret < 0)
-				goto create_error;
-			ret = vfs_mkdir(&init_user_ns, d_inode(dir), next, 0);
-			if (!key)
-				trace_cachefiles_mkdir(object, next, ret);
-			if (ret < 0)
-				goto create_error;
-
-			if (unlikely(d_unhashed(next))) {
-				dput(next);
-				inode_unlock(d_inode(dir));
-				goto lookup_again;
-			}
-			ASSERT(d_backing_inode(next));
-
-			_debug("mkdir -> %pd{ino=%lu}",
-			       next, d_backing_inode(next)->i_ino);
-
-		} else if (!d_can_lookup(next)) {
-			pr_err("inode %lu is not a directory\n",
-			       d_backing_inode(next)->i_ino);
-			ret = -ENOBUFS;
-			goto error;
-		}
-
-	} else {
-		/* non-index objects start out life as files */
-		if (d_is_negative(next)) {
-			ret = cachefiles_has_space(cache, 1, 0);
-			if (ret < 0)
-				goto no_space_error;
-
-			path.dentry = dir;
-			ret = security_path_mknod(&path, next, S_IFREG, 0);
-			if (ret < 0)
-				goto create_error;
-			ret = vfs_create(&init_user_ns, d_inode(dir), next,
-					 S_IFREG, true);
-			trace_cachefiles_create(object, next, ret);
-			if (ret < 0)
-				goto create_error;
-
-			ASSERT(d_backing_inode(next));
-
-			_debug("create -> %pd{ino=%lu}",
-			       next, d_backing_inode(next)->i_ino);
-
-		} else if (!d_can_lookup(next) &&
-			   !d_is_reg(next)
-			   ) {
-			pr_err("inode %lu is not a file or directory\n",
-			       d_backing_inode(next)->i_ino);
-			ret = -ENOBUFS;
-			goto error;
-		}
-	}
-
-	/* process the next component */
-	if (key) {
-		_debug("advance");
-		inode_unlock(d_inode(dir));
-		dput(dir);
-		dir = next;
-		next = NULL;
-		goto advance;
-	}
-
-	/* we've found the object we were looking for */
-	object->dentry = next;
-
-	/* if we've found that the terminal object exists, then we need to
-	 * check its attributes and delete it if it's out of date */
-	if (!object->new) {
-		_debug("validate '%pd'", next);
-
-		ret = cachefiles_check_object_xattr(object, auxdata);
-		if (ret == -ESTALE) {
-			/* delete the object (the deleter drops the directory
-			 * mutex) */
-			object->dentry = NULL;
-
-			ret = cachefiles_bury_object(cache, object, dir, next,
-						     true,
-						     FSCACHE_OBJECT_IS_STALE);
-			dput(next);
-			next = NULL;
-
-			if (ret < 0)
-				goto delete_error;
-
-			_debug("redo lookup");
-			fscache_object_retrying_stale(&object->fscache);
-			goto lookup_again;
-		}
-	}
-
-	/* note that we're now using this object */
-	ret = cachefiles_mark_object_active(cache, object);
-
-	inode_unlock(d_inode(dir));
-	dput(dir);
-	dir = NULL;
-
-	if (ret == -ETIMEDOUT)
-		goto mark_active_timed_out;
-
-	_debug("=== OBTAINED_OBJECT ===");
-
-	if (object->new) {
-		/* attach data to a newly constructed terminal object */
-		ret = cachefiles_set_object_xattr(object, auxdata);
-		if (ret < 0)
-			goto check_error;
-	} else {
-		/* always update the atime on an object we've just looked up
-		 * (this is used to keep track of culling, and atimes are only
-		 * updated by read, write and readdir but not lookup or
-		 * open) */
-		path.dentry = next;
-		touch_atime(&path);
-	}
-
-	/* open a file interface onto a data file */
-	if (object->type != FSCACHE_COOKIE_TYPE_INDEX) {
-		if (d_is_reg(object->dentry)) {
-			const struct address_space_operations *aops;
-
-			ret = -EPERM;
-			aops = d_backing_inode(object->dentry)->i_mapping->a_ops;
-			if (!aops->bmap)
-				goto check_error;
-			if (object->dentry->d_sb->s_blocksize > PAGE_SIZE)
-				goto check_error;
-
-			object->backer = object->dentry;
-		} else {
-			BUG(); // TODO: open file in data-class subdir
-		}
-	}
-
-	object->new = 0;
-	fscache_obtained_object(&object->fscache);
-
-	_leave(" = 0 [%lu]", d_backing_inode(object->dentry)->i_ino);
-	return 0;
-
-no_space_error:
-	fscache_object_mark_killed(&object->fscache, FSCACHE_OBJECT_NO_SPACE);
-create_error:
-	_debug("create error %d", ret);
-	if (ret == -EIO)
-		cachefiles_io_error(cache, "Create/mkdir failed");
-	goto error;
-
-mark_active_timed_out:
-	_debug("mark active timed out");
-	goto release_dentry;
-
-check_error:
-	_debug("check error %d", ret);
-	cachefiles_mark_object_inactive(
-		cache, object, d_backing_inode(object->dentry)->i_blocks);
-release_dentry:
-	dput(object->dentry);
-	object->dentry = NULL;
-	goto error_out;
-
-delete_error:
-	_debug("delete error %d", ret);
-	goto error_out2;
-
-lookup_error:
-	_debug("lookup error %ld", PTR_ERR(next));
-	ret = PTR_ERR(next);
-	if (ret == -EIO)
-		cachefiles_io_error(cache, "Lookup failed");
-	next = NULL;
-error:
-	inode_unlock(d_inode(dir));
-	dput(next);
-error_out2:
-	dput(dir);
-error_out:
-	_leave(" = error %d", -ret);
-	return ret;
-}
-
-/*
- * get a subdirectory
- */
-struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
-					struct dentry *dir,
-					const char *dirname)
-{
-	struct dentry *subdir;
-	struct path path;
-	int ret;
-
-	_enter(",,%s", dirname);
-
-	/* search the current directory for the element name */
-	inode_lock(d_inode(dir));
-
-retry:
-	subdir = lookup_one_len(dirname, dir, strlen(dirname));
-	if (IS_ERR(subdir)) {
-		if (PTR_ERR(subdir) == -ENOMEM)
-			goto nomem_d_alloc;
-		goto lookup_error;
-	}
-
-	_debug("subdir -> %pd %s",
-	       subdir, d_backing_inode(subdir) ? "positive" : "negative");
-
-	/* we need to create the subdir if it doesn't exist yet */
-	if (d_is_negative(subdir)) {
-		ret = cachefiles_has_space(cache, 1, 0);
-		if (ret < 0)
-			goto mkdir_error;
-
-		_debug("attempt mkdir");
-
-		path.mnt = cache->mnt;
-		path.dentry = dir;
-		ret = security_path_mkdir(&path, subdir, 0700);
-		if (ret < 0)
-			goto mkdir_error;
-		ret = vfs_mkdir(&init_user_ns, d_inode(dir), subdir, 0700);
-		if (ret < 0)
-			goto mkdir_error;
-
-		if (unlikely(d_unhashed(subdir))) {
-			dput(subdir);
-			goto retry;
-		}
-		ASSERT(d_backing_inode(subdir));
-
-		_debug("mkdir -> %pd{ino=%lu}",
-		       subdir, d_backing_inode(subdir)->i_ino);
-	}
-
-	inode_unlock(d_inode(dir));
-
-	/* we need to make sure the subdir is a directory */
-	ASSERT(d_backing_inode(subdir));
-
-	if (!d_can_lookup(subdir)) {
-		pr_err("%s is not a directory\n", dirname);
-		ret = -EIO;
-		goto check_error;
-	}
-
-	ret = -EPERM;
-	if (!(d_backing_inode(subdir)->i_opflags & IOP_XATTR) ||
-	    !d_backing_inode(subdir)->i_op->lookup ||
-	    !d_backing_inode(subdir)->i_op->mkdir ||
-	    !d_backing_inode(subdir)->i_op->create ||
-	    !d_backing_inode(subdir)->i_op->rename ||
-	    !d_backing_inode(subdir)->i_op->rmdir ||
-	    !d_backing_inode(subdir)->i_op->unlink)
-		goto check_error;
-
-	_leave(" = [%lu]", d_backing_inode(subdir)->i_ino);
-	return subdir;
-
-check_error:
-	dput(subdir);
-	_leave(" = %d [check]", ret);
-	return ERR_PTR(ret);
-
-mkdir_error:
-	inode_unlock(d_inode(dir));
-	dput(subdir);
-	pr_err("mkdir %s failed with error %d\n", dirname, ret);
-	return ERR_PTR(ret);
-
-lookup_error:
-	inode_unlock(d_inode(dir));
-	ret = PTR_ERR(subdir);
-	pr_err("Lookup %s failed with error %d\n", dirname, ret);
-	return ERR_PTR(ret);
-
-nomem_d_alloc:
-	inode_unlock(d_inode(dir));
-	_leave(" = -ENOMEM");
-	return ERR_PTR(-ENOMEM);
-}
-
-/*
- * find out if an object is in use or not
- * - if finds object and it's not in use:
- *   - returns a pointer to the object and a reference on it
- *   - returns with the directory locked
- */
-static struct dentry *cachefiles_check_active(struct cachefiles_cache *cache,
-					      struct dentry *dir,
-					      char *filename)
-{
-	struct cachefiles_object *object;
-	struct rb_node *_n;
-	struct dentry *victim;
-	int ret;
-
-	//_enter(",%pd/,%s",
-	//       dir, filename);
-
-	/* look up the victim */
-	inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
-
-	victim = lookup_one_len(filename, dir, strlen(filename));
-	if (IS_ERR(victim))
-		goto lookup_error;
-
-	//_debug("victim -> %pd %s",
-	//       victim, d_backing_inode(victim) ? "positive" : "negative");
-
-	/* if the object is no longer there then we probably retired the object
-	 * at the netfs's request whilst the cull was in progress
-	 */
-	if (d_is_negative(victim)) {
-		inode_unlock(d_inode(dir));
-		dput(victim);
-		_leave(" = -ENOENT [absent]");
-		return ERR_PTR(-ENOENT);
-	}
-
-	/* check to see if we're using this object */
-	read_lock(&cache->active_lock);
-
-	_n = cache->active_nodes.rb_node;
-
-	while (_n) {
-		object = rb_entry(_n, struct cachefiles_object, active_node);
-
-		if (object->dentry > victim)
-			_n = _n->rb_left;
-		else if (object->dentry < victim)
-			_n = _n->rb_right;
-		else
-			goto object_in_use;
-	}
-
-	read_unlock(&cache->active_lock);
-
-	//_leave(" = %pd", victim);
-	return victim;
-
-object_in_use:
-	read_unlock(&cache->active_lock);
-	inode_unlock(d_inode(dir));
-	dput(victim);
-	//_leave(" = -EBUSY [in use]");
-	return ERR_PTR(-EBUSY);
-
-lookup_error:
-	inode_unlock(d_inode(dir));
-	ret = PTR_ERR(victim);
-	if (ret == -ENOENT) {
-		/* file or dir now absent - probably retired by netfs */
-		_leave(" = -ESTALE [absent]");
-		return ERR_PTR(-ESTALE);
-	}
-
-	if (ret == -EIO) {
-		cachefiles_io_error(cache, "Lookup failed");
-	} else if (ret != -ENOMEM) {
-		pr_err("Internal error: %d\n", ret);
-		ret = -EIO;
-	}
-
-	_leave(" = %d", ret);
-	return ERR_PTR(ret);
-}
-
-/*
- * cull an object if it's not in use
- * - called only by cache manager daemon
- */
-int cachefiles_cull(struct cachefiles_cache *cache, struct dentry *dir,
-		    char *filename)
-{
-	struct dentry *victim;
-	int ret;
-
-	_enter(",%pd/,%s", dir, filename);
-
-	victim = cachefiles_check_active(cache, dir, filename);
-	if (IS_ERR(victim))
-		return PTR_ERR(victim);
-
-	_debug("victim -> %pd %s",
-	       victim, d_backing_inode(victim) ? "positive" : "negative");
-
-	/* okay... the victim is not being used so we can cull it
-	 * - start by marking it as stale
-	 */
-	_debug("victim is cullable");
-
-	ret = cachefiles_remove_object_xattr(cache, victim);
-	if (ret < 0)
-		goto error_unlock;
-
-	/*  actually remove the victim (drops the dir mutex) */
-	_debug("bury");
-
-	ret = cachefiles_bury_object(cache, NULL, dir, victim, false,
-				     FSCACHE_OBJECT_WAS_CULLED);
-	if (ret < 0)
-		goto error;
-
-	dput(victim);
-	_leave(" = 0");
-	return 0;
-
-error_unlock:
-	inode_unlock(d_inode(dir));
-error:
-	dput(victim);
-	if (ret == -ENOENT) {
-		/* file or dir now absent - probably retired by netfs */
-		_leave(" = -ESTALE [absent]");
-		return -ESTALE;
-	}
-
-	if (ret != -ENOMEM) {
-		pr_err("Internal error: %d\n", ret);
-		ret = -EIO;
-	}
-
-	_leave(" = %d", ret);
-	return ret;
-}
-
-/*
- * find out if an object is in use or not
- * - called only by cache manager daemon
- * - returns -EBUSY or 0 to indicate whether an object is in use or not
- */
-int cachefiles_check_in_use(struct cachefiles_cache *cache, struct dentry *dir,
-			    char *filename)
-{
-	struct dentry *victim;
-
-	//_enter(",%pd/,%s",
-	//       dir, filename);
-
-	victim = cachefiles_check_active(cache, dir, filename);
-	if (IS_ERR(victim))
-		return PTR_ERR(victim);
-
-	inode_unlock(d_inode(dir));
-	dput(victim);
-	//_leave(" = 0");
-	return 0;
-}