--- /dev/null
+/* cf-namei.c: CacheFiles path walking and related routines
+ *
+ * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#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 "internal.h"
+
+/*****************************************************************************/
+/*
+ * record the fact that an object is now active
+ */
+static void 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;
+
+ write_lock(&cache->active_lock);
+
+ dentry = object->dentry;
+ _p = &cache->active_nodes.rb_node;
+ while (*_p) {
+ _parent = *_p;
+ xobject = rb_entry(_parent,
+ struct cachefiles_object, active_node);
+
+ if (xobject->dentry > dentry)
+ _p = &(*_p)->rb_left;
+ else if (xobject->dentry < dentry)
+ _p = &(*_p)->rb_right;
+ else
+ BUG(); /* uh oh... this dentry shouldn't be here */
+ }
+
+ rb_link_node(&object->active_node, _parent, _p);
+ rb_insert_color(&object->active_node, &cache->active_nodes);
+
+ write_unlock(&cache->active_lock);
+}
+
+/*****************************************************************************/
+/*
+ * 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 dentry *dir,
+ struct dentry *rep)
+{
+ struct dentry *grave, *alt, *trap;
+ struct qstr name;
+ const char *old_name;
+ char nbuffer[8 + 8 + 1];
+ int ret;
+
+ _enter(",'%*.*s','%*.*s'",
+ dir->d_name.len, dir->d_name.len, dir->d_name.name,
+ rep->d_name.len, rep->d_name.len, rep->d_name.name);
+
+ /* non-directories can just be unlinked */
+ if (!S_ISDIR(rep->d_inode->i_mode)) {
+ _debug("unlink stale object");
+ ret = dir->d_inode->i_op->unlink(dir->d_inode, rep);
+
+ mutex_unlock(&dir->d_inode->i_mutex);
+
+ if (ret == 0) {
+ _debug("d_delete");
+ d_delete(rep);
+ } else 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");
+ mutex_unlock(&dir->d_inode->i_mutex);
+
+try_again:
+ /* first step is to make up a grave dentry in the graveyard */
+ sprintf(nbuffer, "%08x%08x",
+ (uint32_t) xtime.tv_sec,
+ (uint32_t) atomic_inc_return(&cache->gravecounter));
+
+ name.name = nbuffer;
+ name.len = strlen(name.name);
+
+ /* hash the name */
+ name.hash = full_name_hash(name.name, name.len);
+
+ if (dir->d_op && dir->d_op->d_hash) {
+ ret = dir->d_op->d_hash(dir, &name);
+ if (ret < 0) {
+ if (ret == -EIO)
+ cachefiles_io_error(cache, "Hash failed");
+
+ _leave(" = %d", ret);
+ return ret;
+ }
+ }
+
+ /* do the multiway lock magic */
+ trap = lock_rename(cache->graveyard, dir);
+
+ /* do some checks before getting the grave dentry */
+ if (rep->d_parent != dir) {
+ /* the entry was probably culled when we dropped the parent dir
+ * lock */
+ unlock_rename(cache->graveyard, dir);
+ _leave(" = 0 [culled?]");
+ return 0;
+ }
+
+ if (!S_ISDIR(cache->graveyard->d_inode->i_mode)) {
+ 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;
+ }
+
+ /* see if there's a dentry already there for this name */
+ grave = d_lookup(cache->graveyard, &name);
+ if (!grave) {
+ _debug("not found");
+
+ grave = d_alloc(cache->graveyard, &name);
+ if (!grave) {
+ unlock_rename(cache->graveyard, dir);
+ _leave(" = -ENOMEM");
+ return -ENOMEM;
+ }
+
+ alt = cache->graveyard->d_inode->i_op->lookup(
+ cache->graveyard->d_inode, grave, NULL);
+ if (IS_ERR(alt)) {
+ unlock_rename(cache->graveyard, dir);
+ dput(grave);
+
+ if (PTR_ERR(alt) == -ENOMEM) {
+ _leave(" = -ENOMEM");
+ return -ENOMEM;
+ }
+
+ cachefiles_io_error(cache, "Lookup error %ld",
+ PTR_ERR(alt));
+ return -EIO;
+ }
+
+ if (alt) {
+ dput(grave);
+ grave = alt;
+ }
+ }
+
+ if (grave->d_inode) {
+ 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 */
+ DQUOT_INIT(dir->d_inode);
+ DQUOT_INIT(cache->graveyard->d_inode);
+
+ old_name = fsnotify_oldname_init(rep->d_name.name);
+
+ ret = dir->d_inode->i_op->rename(dir->d_inode, rep,
+ cache->graveyard->d_inode, grave);
+
+ if (ret == 0) {
+ d_move(rep, grave);
+ fsnotify_move(dir->d_inode, cache->graveyard->d_inode,
+ old_name, rep->d_name.name, 1,
+ grave->d_inode, rep->d_inode);
+ } else if (ret != -ENOMEM) {
+ cachefiles_io_error(cache, "Rename failed with error %d", ret);
+ }
+
+ fsnotify_oldname_free(old_name);
+
+ 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(",{%p}", object->dentry);
+
+ ASSERT(object->dentry);
+ ASSERT(object->dentry->d_inode);
+ ASSERT(object->dentry->d_parent);
+
+ dir = dget_parent(object->dentry);
+
+ mutex_lock(&dir->d_inode->i_mutex);
+ ret = cachefiles_bury_object(cache, dir, object->dentry);
+
+ 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,
+ char *key,
+ struct cachefiles_xattr *auxdata)
+{
+ struct cachefiles_cache *cache;
+ struct dentry *dir, *next = NULL, *new;
+ struct qstr name;
+ uid_t fsuid;
+ gid_t fsgid;
+ int ret;
+
+ _enter("{%p}", parent->dentry);
+
+ cache = container_of(parent->fscache.cache,
+ struct cachefiles_cache, cache);
+
+ ASSERT(parent->dentry);
+ ASSERT(parent->dentry->d_inode);
+
+ if (!(S_ISDIR(parent->dentry->d_inode->i_mode))) {
+ // TODO: convert file to dir
+ _leave("looking up in none directory");
+ return -ENOBUFS;
+ }
+
+ fsuid = current->fsuid;
+ fsgid = current->fsgid;
+ current->fsuid = 0;
+ current->fsgid = 0;
+
+ dir = dget(parent->dentry);
+
+advance:
+ /* attempt to transit the first directory component */
+ name.name = key;
+ key = strchr(key, '/');
+ if (key) {
+ name.len = key - (char *) name.name;
+ *key++ = 0;
+ } else {
+ name.len = strlen(name.name);
+ }
+
+ /* hash the name */
+ name.hash = full_name_hash(name.name, name.len);
+
+ if (dir->d_op && dir->d_op->d_hash) {
+ ret = dir->d_op->d_hash(dir, &name);
+ if (ret < 0) {
+ cachefiles_io_error(cache, "Hash failed");
+ goto error_out2;
+ }
+ }
+
+lookup_again:
+ /* search the current directory for the element name */
+ _debug("lookup '%s' %x", name.name, name.hash);
+
+ mutex_lock(&dir->d_inode->i_mutex);
+
+ next = d_lookup(dir, &name);
+ if (!next) {
+ _debug("not found");
+
+ new = d_alloc(dir, &name);
+ if (!new)
+ goto nomem_d_alloc;
+
+ ASSERT(dir->d_inode->i_op);
+ ASSERT(dir->d_inode->i_op->lookup);
+
+ next = dir->d_inode->i_op->lookup(dir->d_inode, new, NULL);
+ if (IS_ERR(next))
+ goto lookup_error;
+
+ if (!next)
+ next = new;
+ else
+ dput(new);
+
+ if (next->d_inode) {
+ ret = -EPERM;
+ if (!next->d_inode->i_op ||
+ !next->d_inode->i_op->setxattr ||
+ !next->d_inode->i_op->getxattr ||
+ !next->d_inode->i_op->removexattr)
+ goto error;
+
+ if (key && (!next->d_inode->i_op->lookup ||
+ !next->d_inode->i_op->mkdir ||
+ !next->d_inode->i_op->create ||
+ !next->d_inode->i_op->rename ||
+ !next->d_inode->i_op->rmdir ||
+ !next->d_inode->i_op->unlink))
+ goto error;
+ }
+ }
+
+ _debug("next -> %p %s", next, next->d_inode ? "positive" : "negative");
+
+ if (!key)
+ object->new = !next->d_inode;
+
+ /* 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 (!next->d_inode) {
+ DQUOT_INIT(dir->d_inode);
+ ret = dir->d_inode->i_op->mkdir(dir->d_inode, next, 0);
+ if (ret < 0)
+ goto create_error;
+
+ ASSERT(next->d_inode);
+
+ fsnotify_mkdir(dir->d_inode, next);
+
+ _debug("mkdir -> %p{%p{ino=%lu}}",
+ next, next->d_inode, next->d_inode->i_ino);
+
+ } else if (!S_ISDIR(next->d_inode->i_mode)) {
+ kerror("inode %lu is not a directory",
+ next->d_inode->i_ino);
+ ret = -ENOBUFS;
+ goto error;
+ }
+
+ } else {
+ /* non-index objects start out life as files */
+ if (!next->d_inode) {
+ DQUOT_INIT(dir->d_inode);
+ ret = dir->d_inode->i_op->create(dir->d_inode, next,
+ S_IFREG, NULL);
+ if (ret < 0)
+ goto create_error;
+
+ ASSERT(next->d_inode);
+
+ fsnotify_create(dir->d_inode, next);
+
+ _debug("create -> %p{%p{ino=%lu}}",
+ next, next->d_inode, next->d_inode->i_ino);
+
+ } else if (!S_ISDIR(next->d_inode->i_mode) &&
+ !S_ISREG(next->d_inode->i_mode)
+ ) {
+ kerror("inode %lu is not a file or directory",
+ next->d_inode->i_ino);
+ ret = -ENOBUFS;
+ goto error;
+ }
+ }
+
+ /* process the next component */
+ if (key) {
+ _debug("advance");
+ mutex_unlock(&dir->d_inode->i_mutex);
+ 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 '%*.*s'",
+ next->d_name.len, next->d_name.len, next->d_name.name);
+
+ 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, dir, next);
+ dput(next);
+ next = NULL;
+
+ if (ret < 0)
+ goto delete_error;
+
+ _debug("redo lookup");
+ goto lookup_again;
+ }
+ }
+
+ /* note that we're now using this object */
+ cachefiles_mark_object_active(cache, object);
+
+ mutex_unlock(&dir->d_inode->i_mutex);
+ dput(dir);
+ dir = NULL;
+
+ 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) */
+ touch_atime(cache->mnt, next);
+ }
+
+ /* open a file interface onto a data file */
+ if (object->type != FSCACHE_COOKIE_TYPE_INDEX) {
+ if (S_ISREG(object->dentry->d_inode->i_mode)) {
+ const struct address_space_operations *aops;
+
+ ret = -EPERM;
+ aops = object->dentry->d_inode->i_mapping->a_ops;
+ if (!aops->bmap ||
+ !aops->prepare_write ||
+ !aops->commit_write)
+ goto check_error;
+
+ object->backer = object->dentry;
+ } else {
+ BUG(); // TODO: open file in data-class subdir
+ }
+ }
+
+ current->fsuid = fsuid;
+ current->fsgid = fsgid;
+ object->new = 0;
+
+ _leave(" = 0 [%lu]", object->dentry->d_inode->i_ino);
+ return 0;
+
+create_error:
+ if (ret == -EIO)
+ cachefiles_io_error(cache, "create/mkdir failed");
+ goto error;
+
+check_error:
+ write_lock(&cache->active_lock);
+ rb_erase(&object->active_node, &cache->active_nodes);
+ write_unlock(&cache->active_lock);
+
+ 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));
+ dput(new);
+ ret = PTR_ERR(next);
+ if (ret == -EIO)
+ cachefiles_io_error(cache, "Lookup failed");
+ next = NULL;
+ goto error;
+
+nomem_d_alloc:
+ ret = -ENOMEM;
+error:
+ mutex_unlock(&dir->d_inode->i_mutex);
+ dput(next);
+error_out2:
+ dput(dir);
+error_out:
+ current->fsuid = fsuid;
+ current->fsgid = fsgid;
+
+ _leave(" = ret");
+ return ret;
+}
+
+/*****************************************************************************/
+/*
+ * get a subdirectory
+ */
+struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
+ struct dentry *dir,
+ const char *dirname)
+{
+ struct dentry *subdir, *new;
+ struct qstr name;
+ uid_t fsuid;
+ gid_t fsgid;
+ int ret;
+
+ _enter("");
+
+ /* set up the name */
+ name.name = dirname;
+ name.len = strlen(dirname);
+ name.hash = full_name_hash(name.name, name.len);
+
+ if (dir->d_op && dir->d_op->d_hash) {
+ ret = dir->d_op->d_hash(dir, &name);
+ if (ret < 0) {
+ if (ret == -EIO)
+ kerror("Hash failed");
+ _leave(" = %d", ret);
+ return ERR_PTR(ret);
+ }
+ }
+
+ /* search the current directory for the element name */
+ _debug("lookup '%s' %x", name.name, name.hash);
+
+ fsuid = current->fsuid;
+ fsgid = current->fsgid;
+ current->fsuid = 0;
+ current->fsgid = 0;
+
+ mutex_lock(&dir->d_inode->i_mutex);
+
+ subdir = d_lookup(dir, &name);
+ if (!subdir) {
+ _debug("not found");
+
+ new = d_alloc(dir, &name);
+ if (!new)
+ goto nomem_d_alloc;
+
+ subdir = dir->d_inode->i_op->lookup(dir->d_inode, new, NULL);
+ if (IS_ERR(subdir))
+ goto lookup_error;
+
+ if (!subdir)
+ subdir = new;
+ else
+ dput(new);
+ }
+
+ _debug("subdir -> %p %s",
+ subdir, subdir->d_inode ? "positive" : "negative");
+
+ /* we need to create the subdir if it doesn't exist yet */
+ if (!subdir->d_inode) {
+ DQUOT_INIT(dir->d_inode);
+ ret = dir->d_inode->i_op->mkdir(dir->d_inode, subdir, 0700);
+ if (ret < 0)
+ goto mkdir_error;
+
+ ASSERT(subdir->d_inode);
+
+ fsnotify_mkdir(dir->d_inode, subdir);
+
+ _debug("mkdir -> %p{%p{ino=%lu}}",
+ subdir,
+ subdir->d_inode,
+ subdir->d_inode->i_ino);
+ }
+
+ mutex_unlock(&dir->d_inode->i_mutex);
+
+ current->fsuid = fsuid;
+ current->fsgid = fsgid;
+
+ /* we need to make sure the subdir is a directory */
+ ASSERT(subdir->d_inode);
+
+ if (!S_ISDIR(subdir->d_inode->i_mode)) {
+ kerror("%s is not a directory", dirname);
+ ret = -EIO;
+ goto check_error;
+ }
+
+ ret = -EPERM;
+ if (!subdir->d_inode->i_op ||
+ !subdir->d_inode->i_op->setxattr ||
+ !subdir->d_inode->i_op->getxattr ||
+ !subdir->d_inode->i_op->lookup ||
+ !subdir->d_inode->i_op->mkdir ||
+ !subdir->d_inode->i_op->create ||
+ !subdir->d_inode->i_op->rename ||
+ !subdir->d_inode->i_op->rmdir ||
+ !subdir->d_inode->i_op->unlink)
+ goto check_error;
+
+ _leave(" = [%lu]", subdir->d_inode->i_ino);
+ return subdir;
+
+check_error:
+ dput(subdir);
+ _leave(" = %d [check]", ret);
+ return ERR_PTR(ret);
+
+mkdir_error:
+ mutex_unlock(&dir->d_inode->i_mutex);
+ kerror("mkdir %s failed with error %d", dirname, ret);
+ goto error_out;
+
+lookup_error:
+ mutex_unlock(&dir->d_inode->i_mutex);
+ dput(new);
+ ret = PTR_ERR(subdir);
+ kerror("Lookup %s failed with error %d", dirname, ret);
+ goto error_out;
+
+nomem_d_alloc:
+ mutex_unlock(&dir->d_inode->i_mutex);
+ ret = -ENOMEM;
+ goto error_out;
+
+error_out:
+ current->fsuid = fsuid;
+ current->fsgid = fsgid;
+ _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 cachefiles_object *object;
+ struct rb_node *_n;
+ struct dentry *victim, *new;
+ struct qstr name;
+ int ret;
+
+ _enter(",%*.*s/,%s",
+ dir->d_name.len, dir->d_name.len, dir->d_name.name, filename);
+
+ /* set up the name */
+ name.name = filename;
+ name.len = strlen(filename);
+ name.hash = full_name_hash(name.name, name.len);
+
+ if (dir->d_op && dir->d_op->d_hash) {
+ ret = dir->d_op->d_hash(dir, &name);
+ if (ret < 0) {
+ if (ret == -EIO)
+ cachefiles_io_error(cache, "Hash failed");
+ _leave(" = %d", ret);
+ return ret;
+ }
+ }
+
+ /* look up the victim */
+ mutex_lock(&dir->d_inode->i_mutex);
+
+ victim = d_lookup(dir, &name);
+ if (!victim) {
+ _debug("not found");
+
+ new = d_alloc(dir, &name);
+ if (!new)
+ goto nomem_d_alloc;
+
+ victim = dir->d_inode->i_op->lookup(dir->d_inode, new, NULL);
+ if (IS_ERR(victim))
+ goto lookup_error;
+
+ if (!victim)
+ victim = new;
+ else
+ dput(new);
+ }
+
+ _debug("victim -> %p %s",
+ victim, victim->d_inode ? "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 (!victim->d_inode) {
+ mutex_unlock(&dir->d_inode->i_mutex);
+ dput(victim);
+ _leave(" = -ENOENT [absent]");
+ return -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);
+
+ /* 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, dir, victim);
+ if (ret < 0)
+ goto error;
+
+ dput(victim);
+ _leave(" = 0");
+ return 0;
+
+
+object_in_use:
+ read_unlock(&cache->active_lock);
+ mutex_unlock(&dir->d_inode->i_mutex);
+ dput(victim);
+ _leave(" = -EBUSY [in use]");
+ return -EBUSY;
+
+nomem_d_alloc:
+ mutex_unlock(&dir->d_inode->i_mutex);
+ _leave(" = -ENOMEM");
+ return -ENOMEM;
+
+lookup_error:
+ mutex_unlock(&dir->d_inode->i_mutex);
+ dput(new);
+ ret = PTR_ERR(victim);
+ if (ret == -EIO)
+ cachefiles_io_error(cache, "Lookup failed");
+ goto choose_error;
+
+error_unlock:
+ mutex_unlock(&dir->d_inode->i_mutex);
+error:
+ dput(victim);
+choose_error:
+ if (ret == -ENOENT) {
+ /* file or dir now absent - probably retired by netfs */
+ _leave(" = -ESTALE [absent]");
+ return -ESTALE;
+ }
+
+ if (ret != -ENOMEM) {
+ kerror("Internal error: %d", ret);
+ ret = -EIO;
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+}
git://git.onelab.eu / linux-2.6.git / blobdiff