Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/fs/kernfs/Kconfig b/fs/kernfs/Kconfig
index 397b5f7..e7f0910 100644
--- a/fs/kernfs/Kconfig
+++ b/fs/kernfs/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
#
# KERNFS should be selected by its users
#
diff --git a/fs/kernfs/Makefile b/fs/kernfs/Makefile
index 674337c..4ca54ff 100644
--- a/fs/kernfs/Makefile
+++ b/fs/kernfs/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
#
# Makefile for the kernfs pseudo filesystem
#
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index 4ca0b5c..6ebae6b 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -1,11 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* fs/kernfs/dir.c - kernfs directory implementation
*
* Copyright (c) 2001-3 Patrick Mochel
* Copyright (c) 2007 SUSE Linux Products GmbH
* Copyright (c) 2007, 2013 Tejun Heo <tj@kernel.org>
- *
- * This file is released under the GPLv2.
*/
#include <linux/sched.h>
@@ -138,6 +137,9 @@
if (kn_from == kn_to)
return strlcpy(buf, "/", buflen);
+ if (!buf)
+ return -EINVAL;
+
common = kernfs_common_ancestor(kn_from, kn_to);
if (WARN_ON(!common))
return -EINVAL;
@@ -145,8 +147,7 @@
depth_to = kernfs_depth(common, kn_to);
depth_from = kernfs_depth(common, kn_from);
- if (buf)
- buf[0] = '\0';
+ buf[0] = '\0';
for (i = 0; i < depth_from; i++)
len += strlcpy(buf + len, parent_str,
@@ -431,7 +432,6 @@
*/
void kernfs_put_active(struct kernfs_node *kn)
{
- struct kernfs_root *root = kernfs_root(kn);
int v;
if (unlikely(!kn))
@@ -443,7 +443,7 @@
if (likely(v != KN_DEACTIVATED_BIAS))
return;
- wake_up_all(&root->deactivate_waitq);
+ wake_up_all(&kernfs_root(kn)->deactivate_waitq);
}
/**
@@ -532,12 +532,9 @@
kfree_const(kn->name);
if (kn->iattr) {
- if (kn->iattr->ia_secdata)
- security_release_secctx(kn->iattr->ia_secdata,
- kn->iattr->ia_secdata_len);
simple_xattrs_free(&kn->iattr->xattrs);
+ kmem_cache_free(kernfs_iattrs_cache, kn->iattr);
}
- kfree(kn->iattr);
spin_lock(&kernfs_idr_lock);
idr_remove(&root->ino_idr, kn->id.ino);
spin_unlock(&kernfs_idr_lock);
@@ -618,6 +615,7 @@
}
static struct kernfs_node *__kernfs_new_node(struct kernfs_root *root,
+ struct kernfs_node *parent,
const char *name, umode_t mode,
kuid_t uid, kgid_t gid,
unsigned flags)
@@ -650,11 +648,10 @@
kn->id.generation = gen;
/*
- * set ino first. This barrier is paired with atomic_inc_not_zero in
+ * set ino first. This RELEASE is paired with atomic_inc_not_zero in
* kernfs_find_and_get_node_by_ino
*/
- smp_mb__before_atomic();
- atomic_set(&kn->count, 1);
+ atomic_set_release(&kn->count, 1);
atomic_set(&kn->active, KN_DEACTIVATED_BIAS);
RB_CLEAR_NODE(&kn->rb);
@@ -674,6 +671,12 @@
goto err_out3;
}
+ if (parent) {
+ ret = security_kernfs_init_security(parent, kn);
+ if (ret)
+ goto err_out3;
+ }
+
return kn;
err_out3:
@@ -692,7 +695,7 @@
{
struct kernfs_node *kn;
- kn = __kernfs_new_node(kernfs_root(parent),
+ kn = __kernfs_new_node(kernfs_root(parent), parent,
name, mode, uid, gid, flags);
if (kn) {
kernfs_get(parent);
@@ -795,9 +798,8 @@
/* Update timestamps on the parent */
ps_iattr = parent->iattr;
if (ps_iattr) {
- struct iattr *ps_iattrs = &ps_iattr->ia_iattr;
- ktime_get_real_ts64(&ps_iattrs->ia_ctime);
- ps_iattrs->ia_mtime = ps_iattrs->ia_ctime;
+ ktime_get_real_ts64(&ps_iattr->ia_ctime);
+ ps_iattr->ia_mtime = ps_iattr->ia_ctime;
}
mutex_unlock(&kernfs_mutex);
@@ -962,7 +964,7 @@
INIT_LIST_HEAD(&root->supers);
root->next_generation = 1;
- kn = __kernfs_new_node(root, "", S_IFDIR | S_IRUGO | S_IXUGO,
+ kn = __kernfs_new_node(root, NULL, "", S_IFDIR | S_IRUGO | S_IXUGO,
GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
KERNFS_DIR);
if (!kn) {
@@ -1329,9 +1331,8 @@
/* update timestamps on the parent */
if (ps_iattr) {
- ktime_get_real_ts64(&ps_iattr->ia_iattr.ia_ctime);
- ps_iattr->ia_iattr.ia_mtime =
- ps_iattr->ia_iattr.ia_ctime;
+ ktime_get_real_ts64(&ps_iattr->ia_ctime);
+ ps_iattr->ia_mtime = ps_iattr->ia_ctime;
}
kernfs_put(pos);
diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index dbf5bc2..e8c792b 100644
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -1,11 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* fs/kernfs/file.c - kernfs file implementation
*
* Copyright (c) 2001-3 Patrick Mochel
* Copyright (c) 2007 SUSE Linux Products GmbH
* Copyright (c) 2007, 2013 Tejun Heo <tj@kernel.org>
- *
- * This file is released under the GPLv2.
*/
#include <linux/fs.h>
@@ -832,32 +831,40 @@
* to see if it supports poll (Neither 'poll' nor 'select' return
* an appropriate error code). When in doubt, set a suitable timeout value.
*/
+__poll_t kernfs_generic_poll(struct kernfs_open_file *of, poll_table *wait)
+{
+ struct kernfs_node *kn = kernfs_dentry_node(of->file->f_path.dentry);
+ struct kernfs_open_node *on = kn->attr.open;
+
+ poll_wait(of->file, &on->poll, wait);
+
+ if (of->event != atomic_read(&on->event))
+ return DEFAULT_POLLMASK|EPOLLERR|EPOLLPRI;
+
+ return DEFAULT_POLLMASK;
+}
+
static __poll_t kernfs_fop_poll(struct file *filp, poll_table *wait)
{
struct kernfs_open_file *of = kernfs_of(filp);
struct kernfs_node *kn = kernfs_dentry_node(filp->f_path.dentry);
- struct kernfs_open_node *on = kn->attr.open;
+ __poll_t ret;
if (!kernfs_get_active(kn))
- goto trigger;
+ return DEFAULT_POLLMASK|EPOLLERR|EPOLLPRI;
- poll_wait(filp, &on->poll, wait);
+ if (kn->attr.ops->poll)
+ ret = kn->attr.ops->poll(of, wait);
+ else
+ ret = kernfs_generic_poll(of, wait);
kernfs_put_active(kn);
-
- if (of->event != atomic_read(&on->event))
- goto trigger;
-
- return DEFAULT_POLLMASK;
-
- trigger:
- return DEFAULT_POLLMASK|EPOLLERR|EPOLLPRI;
+ return ret;
}
static void kernfs_notify_workfn(struct work_struct *work)
{
struct kernfs_node *kn;
- struct kernfs_open_node *on;
struct kernfs_super_info *info;
repeat:
/* pop one off the notify_list */
@@ -871,23 +878,13 @@
kn->attr.notify_next = NULL;
spin_unlock_irq(&kernfs_notify_lock);
- /* kick poll */
- spin_lock_irq(&kernfs_open_node_lock);
-
- on = kn->attr.open;
- if (on) {
- atomic_inc(&on->event);
- wake_up_interruptible(&on->poll);
- }
-
- spin_unlock_irq(&kernfs_open_node_lock);
-
/* kick fsnotify */
mutex_lock(&kernfs_mutex);
list_for_each_entry(info, &kernfs_root(kn)->supers, node) {
struct kernfs_node *parent;
struct inode *inode;
+ struct qstr name;
/*
* We want fsnotify_modify() on @kn but as the
@@ -899,6 +896,7 @@
if (!inode)
continue;
+ name = (struct qstr)QSTR_INIT(kn->name, strlen(kn->name));
parent = kernfs_get_parent(kn);
if (parent) {
struct inode *p_inode;
@@ -906,7 +904,7 @@
p_inode = ilookup(info->sb, parent->id.ino);
if (p_inode) {
fsnotify(p_inode, FS_MODIFY | FS_EVENT_ON_CHILD,
- inode, FSNOTIFY_EVENT_INODE, kn->name, 0);
+ inode, FSNOTIFY_EVENT_INODE, &name, 0);
iput(p_inode);
}
@@ -914,7 +912,7 @@
}
fsnotify(inode, FS_MODIFY, inode, FSNOTIFY_EVENT_INODE,
- kn->name, 0);
+ &name, 0);
iput(inode);
}
@@ -934,10 +932,21 @@
{
static DECLARE_WORK(kernfs_notify_work, kernfs_notify_workfn);
unsigned long flags;
+ struct kernfs_open_node *on;
if (WARN_ON(kernfs_type(kn) != KERNFS_FILE))
return;
+ /* kick poll immediately */
+ spin_lock_irqsave(&kernfs_open_node_lock, flags);
+ on = kn->attr.open;
+ if (on) {
+ atomic_inc(&on->event);
+ wake_up_interruptible(&on->poll);
+ }
+ spin_unlock_irqrestore(&kernfs_open_node_lock, flags);
+
+ /* schedule work to kick fsnotify */
spin_lock_irqsave(&kernfs_notify_lock, flags);
if (!kn->attr.notify_next) {
kernfs_get(kn);
diff --git a/fs/kernfs/inode.c b/fs/kernfs/inode.c
index 80cebcd..f3eaa88 100644
--- a/fs/kernfs/inode.c
+++ b/fs/kernfs/inode.c
@@ -1,11 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* fs/kernfs/inode.c - kernfs inode implementation
*
* Copyright (c) 2001-3 Patrick Mochel
* Copyright (c) 2007 SUSE Linux Products GmbH
* Copyright (c) 2007, 2013 Tejun Heo <tj@kernel.org>
- *
- * This file is released under the GPLv2.
*/
#include <linux/pagemap.h>
@@ -31,30 +30,27 @@
.listxattr = kernfs_iop_listxattr,
};
-static struct kernfs_iattrs *kernfs_iattrs(struct kernfs_node *kn)
+static struct kernfs_iattrs *__kernfs_iattrs(struct kernfs_node *kn, int alloc)
{
static DEFINE_MUTEX(iattr_mutex);
struct kernfs_iattrs *ret;
- struct iattr *iattrs;
mutex_lock(&iattr_mutex);
- if (kn->iattr)
+ if (kn->iattr || !alloc)
goto out_unlock;
- kn->iattr = kzalloc(sizeof(struct kernfs_iattrs), GFP_KERNEL);
+ kn->iattr = kmem_cache_zalloc(kernfs_iattrs_cache, GFP_KERNEL);
if (!kn->iattr)
goto out_unlock;
- iattrs = &kn->iattr->ia_iattr;
/* assign default attributes */
- iattrs->ia_mode = kn->mode;
- iattrs->ia_uid = GLOBAL_ROOT_UID;
- iattrs->ia_gid = GLOBAL_ROOT_GID;
+ kn->iattr->ia_uid = GLOBAL_ROOT_UID;
+ kn->iattr->ia_gid = GLOBAL_ROOT_GID;
- ktime_get_real_ts64(&iattrs->ia_atime);
- iattrs->ia_mtime = iattrs->ia_atime;
- iattrs->ia_ctime = iattrs->ia_atime;
+ ktime_get_real_ts64(&kn->iattr->ia_atime);
+ kn->iattr->ia_mtime = kn->iattr->ia_atime;
+ kn->iattr->ia_ctime = kn->iattr->ia_atime;
simple_xattrs_init(&kn->iattr->xattrs);
out_unlock:
@@ -63,32 +59,37 @@
return ret;
}
+static struct kernfs_iattrs *kernfs_iattrs(struct kernfs_node *kn)
+{
+ return __kernfs_iattrs(kn, 1);
+}
+
+static struct kernfs_iattrs *kernfs_iattrs_noalloc(struct kernfs_node *kn)
+{
+ return __kernfs_iattrs(kn, 0);
+}
+
int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr)
{
struct kernfs_iattrs *attrs;
- struct iattr *iattrs;
unsigned int ia_valid = iattr->ia_valid;
attrs = kernfs_iattrs(kn);
if (!attrs)
return -ENOMEM;
- iattrs = &attrs->ia_iattr;
-
if (ia_valid & ATTR_UID)
- iattrs->ia_uid = iattr->ia_uid;
+ attrs->ia_uid = iattr->ia_uid;
if (ia_valid & ATTR_GID)
- iattrs->ia_gid = iattr->ia_gid;
+ attrs->ia_gid = iattr->ia_gid;
if (ia_valid & ATTR_ATIME)
- iattrs->ia_atime = iattr->ia_atime;
+ attrs->ia_atime = iattr->ia_atime;
if (ia_valid & ATTR_MTIME)
- iattrs->ia_mtime = iattr->ia_mtime;
+ attrs->ia_mtime = iattr->ia_mtime;
if (ia_valid & ATTR_CTIME)
- iattrs->ia_ctime = iattr->ia_ctime;
- if (ia_valid & ATTR_MODE) {
- umode_t mode = iattr->ia_mode;
- iattrs->ia_mode = kn->mode = mode;
- }
+ attrs->ia_ctime = iattr->ia_ctime;
+ if (ia_valid & ATTR_MODE)
+ kn->mode = iattr->ia_mode;
return 0;
}
@@ -135,23 +136,6 @@
return error;
}
-static int kernfs_node_setsecdata(struct kernfs_iattrs *attrs, void **secdata,
- u32 *secdata_len)
-{
- void *old_secdata;
- size_t old_secdata_len;
-
- old_secdata = attrs->ia_secdata;
- old_secdata_len = attrs->ia_secdata_len;
-
- attrs->ia_secdata = *secdata;
- attrs->ia_secdata_len = *secdata_len;
-
- *secdata = old_secdata;
- *secdata_len = old_secdata_len;
- return 0;
-}
-
ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size)
{
struct kernfs_node *kn = kernfs_dentry_node(dentry);
@@ -171,14 +155,14 @@
inode->i_ctime = current_time(inode);
}
-static inline void set_inode_attr(struct inode *inode, struct iattr *iattr)
+static inline void set_inode_attr(struct inode *inode,
+ struct kernfs_iattrs *attrs)
{
- struct super_block *sb = inode->i_sb;
- inode->i_uid = iattr->ia_uid;
- inode->i_gid = iattr->ia_gid;
- inode->i_atime = timespec64_trunc(iattr->ia_atime, sb->s_time_gran);
- inode->i_mtime = timespec64_trunc(iattr->ia_mtime, sb->s_time_gran);
- inode->i_ctime = timespec64_trunc(iattr->ia_ctime, sb->s_time_gran);
+ inode->i_uid = attrs->ia_uid;
+ inode->i_gid = attrs->ia_gid;
+ inode->i_atime = timestamp_truncate(attrs->ia_atime, inode);
+ inode->i_mtime = timestamp_truncate(attrs->ia_mtime, inode);
+ inode->i_ctime = timestamp_truncate(attrs->ia_ctime, inode);
}
static void kernfs_refresh_inode(struct kernfs_node *kn, struct inode *inode)
@@ -186,15 +170,12 @@
struct kernfs_iattrs *attrs = kn->iattr;
inode->i_mode = kn->mode;
- if (attrs) {
+ if (attrs)
/*
* kernfs_node has non-default attributes get them from
* persistent copy in kernfs_node.
*/
- set_inode_attr(inode, &attrs->ia_iattr);
- security_inode_notifysecctx(inode, attrs->ia_secdata,
- attrs->ia_secdata_len);
- }
+ set_inode_attr(inode, attrs);
if (kernfs_type(kn) == KERNFS_DIR)
set_nlink(inode, kn->dir.subdirs + 2);
@@ -305,78 +286,57 @@
return generic_permission(inode, mask);
}
-static int kernfs_xattr_get(const struct xattr_handler *handler,
- struct dentry *unused, struct inode *inode,
- const char *suffix, void *value, size_t size)
+int kernfs_xattr_get(struct kernfs_node *kn, const char *name,
+ void *value, size_t size)
{
- const char *name = xattr_full_name(handler, suffix);
- struct kernfs_node *kn = inode->i_private;
- struct kernfs_iattrs *attrs;
-
- attrs = kernfs_iattrs(kn);
+ struct kernfs_iattrs *attrs = kernfs_iattrs_noalloc(kn);
if (!attrs)
- return -ENOMEM;
+ return -ENODATA;
return simple_xattr_get(&attrs->xattrs, name, value, size);
}
-static int kernfs_xattr_set(const struct xattr_handler *handler,
- struct dentry *unused, struct inode *inode,
- const char *suffix, const void *value,
- size_t size, int flags)
+int kernfs_xattr_set(struct kernfs_node *kn, const char *name,
+ const void *value, size_t size, int flags)
{
- const char *name = xattr_full_name(handler, suffix);
- struct kernfs_node *kn = inode->i_private;
- struct kernfs_iattrs *attrs;
-
- attrs = kernfs_iattrs(kn);
+ struct kernfs_iattrs *attrs = kernfs_iattrs(kn);
if (!attrs)
return -ENOMEM;
return simple_xattr_set(&attrs->xattrs, name, value, size, flags);
}
+static int kernfs_vfs_xattr_get(const struct xattr_handler *handler,
+ struct dentry *unused, struct inode *inode,
+ const char *suffix, void *value, size_t size)
+{
+ const char *name = xattr_full_name(handler, suffix);
+ struct kernfs_node *kn = inode->i_private;
+
+ return kernfs_xattr_get(kn, name, value, size);
+}
+
+static int kernfs_vfs_xattr_set(const struct xattr_handler *handler,
+ struct dentry *unused, struct inode *inode,
+ const char *suffix, const void *value,
+ size_t size, int flags)
+{
+ const char *name = xattr_full_name(handler, suffix);
+ struct kernfs_node *kn = inode->i_private;
+
+ return kernfs_xattr_set(kn, name, value, size, flags);
+}
+
static const struct xattr_handler kernfs_trusted_xattr_handler = {
.prefix = XATTR_TRUSTED_PREFIX,
- .get = kernfs_xattr_get,
- .set = kernfs_xattr_set,
+ .get = kernfs_vfs_xattr_get,
+ .set = kernfs_vfs_xattr_set,
};
-static int kernfs_security_xattr_set(const struct xattr_handler *handler,
- struct dentry *unused, struct inode *inode,
- const char *suffix, const void *value,
- size_t size, int flags)
-{
- struct kernfs_node *kn = inode->i_private;
- struct kernfs_iattrs *attrs;
- void *secdata;
- u32 secdata_len = 0;
- int error;
-
- attrs = kernfs_iattrs(kn);
- if (!attrs)
- return -ENOMEM;
-
- error = security_inode_setsecurity(inode, suffix, value, size, flags);
- if (error)
- return error;
- error = security_inode_getsecctx(inode, &secdata, &secdata_len);
- if (error)
- return error;
-
- mutex_lock(&kernfs_mutex);
- error = kernfs_node_setsecdata(attrs, &secdata, &secdata_len);
- mutex_unlock(&kernfs_mutex);
-
- if (secdata)
- security_release_secctx(secdata, secdata_len);
- return error;
-}
-
static const struct xattr_handler kernfs_security_xattr_handler = {
.prefix = XATTR_SECURITY_PREFIX,
- .get = kernfs_xattr_get,
- .set = kernfs_security_xattr_set,
+ .get = kernfs_vfs_xattr_get,
+ .set = kernfs_vfs_xattr_set,
};
const struct xattr_handler *kernfs_xattr_handlers[] = {
diff --git a/fs/kernfs/kernfs-internal.h b/fs/kernfs/kernfs-internal.h
index 3d83b11..02ce570 100644
--- a/fs/kernfs/kernfs-internal.h
+++ b/fs/kernfs/kernfs-internal.h
@@ -1,11 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
/*
* fs/kernfs/kernfs-internal.h - kernfs internal header file
*
* Copyright (c) 2001-3 Patrick Mochel
* Copyright (c) 2007 SUSE Linux Products GmbH
* Copyright (c) 2007, 2013 Tejun Heo <teheo@suse.de>
- *
- * This file is released under the GPLv2.
*/
#ifndef __KERNFS_INTERNAL_H
@@ -17,11 +16,14 @@
#include <linux/xattr.h>
#include <linux/kernfs.h>
+#include <linux/fs_context.h>
struct kernfs_iattrs {
- struct iattr ia_iattr;
- void *ia_secdata;
- u32 ia_secdata_len;
+ kuid_t ia_uid;
+ kgid_t ia_gid;
+ struct timespec64 ia_atime;
+ struct timespec64 ia_mtime;
+ struct timespec64 ia_ctime;
struct simple_xattrs xattrs;
};
@@ -78,7 +80,7 @@
}
extern const struct super_operations kernfs_sops;
-extern struct kmem_cache *kernfs_node_cache;
+extern struct kmem_cache *kernfs_node_cache, *kernfs_iattrs_cache;
/*
* inode.c
diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index ff2716f..6c12fac 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -1,11 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* fs/kernfs/mount.c - kernfs mount implementation
*
* Copyright (c) 2001-3 Patrick Mochel
* Copyright (c) 2007 SUSE Linux Products GmbH
* Copyright (c) 2007, 2013 Tejun Heo <tj@kernel.org>
- *
- * This file is released under the GPLv2.
*/
#include <linux/fs.h>
@@ -20,17 +19,7 @@
#include "kernfs-internal.h"
-struct kmem_cache *kernfs_node_cache;
-
-static int kernfs_sop_remount_fs(struct super_block *sb, int *flags, char *data)
-{
- struct kernfs_root *root = kernfs_info(sb)->root;
- struct kernfs_syscall_ops *scops = root->syscall_ops;
-
- if (scops && scops->remount_fs)
- return scops->remount_fs(root, flags, data);
- return 0;
-}
+struct kmem_cache *kernfs_node_cache, *kernfs_iattrs_cache;
static int kernfs_sop_show_options(struct seq_file *sf, struct dentry *dentry)
{
@@ -60,7 +49,6 @@
.drop_inode = generic_delete_inode,
.evict_inode = kernfs_evict_inode,
- .remount_fs = kernfs_sop_remount_fs,
.show_options = kernfs_sop_show_options,
.show_path = kernfs_sop_show_path,
};
@@ -196,8 +184,10 @@
return dentry;
knparent = find_next_ancestor(kn, NULL);
- if (WARN_ON(!knparent))
+ if (WARN_ON(!knparent)) {
+ dput(dentry);
return ERR_PTR(-EINVAL);
+ }
do {
struct dentry *dtmp;
@@ -206,8 +196,10 @@
if (kn == knparent)
return dentry;
kntmp = find_next_ancestor(kn, knparent);
- if (WARN_ON(!kntmp))
+ if (WARN_ON(!kntmp)) {
+ dput(dentry);
return ERR_PTR(-EINVAL);
+ }
dtmp = lookup_one_len_unlocked(kntmp->name, dentry,
strlen(kntmp->name));
dput(dentry);
@@ -218,7 +210,7 @@
} while (true);
}
-static int kernfs_fill_super(struct super_block *sb, unsigned long magic)
+static int kernfs_fill_super(struct super_block *sb, struct kernfs_fs_context *kfc)
{
struct kernfs_super_info *info = kernfs_info(sb);
struct inode *inode;
@@ -229,13 +221,16 @@
sb->s_iflags |= SB_I_NOEXEC | SB_I_NODEV;
sb->s_blocksize = PAGE_SIZE;
sb->s_blocksize_bits = PAGE_SHIFT;
- sb->s_magic = magic;
+ sb->s_magic = kfc->magic;
sb->s_op = &kernfs_sops;
sb->s_xattr = kernfs_xattr_handlers;
if (info->root->flags & KERNFS_ROOT_SUPPORT_EXPORTOP)
sb->s_export_op = &kernfs_export_ops;
sb->s_time_gran = 1;
+ /* sysfs dentries and inodes don't require IO to create */
+ sb->s_shrink.seeks = 0;
+
/* get root inode, initialize and unlock it */
mutex_lock(&kernfs_mutex);
inode = kernfs_get_inode(sb, info->root->kn);
@@ -256,21 +251,20 @@
return 0;
}
-static int kernfs_test_super(struct super_block *sb, void *data)
+static int kernfs_test_super(struct super_block *sb, struct fs_context *fc)
{
struct kernfs_super_info *sb_info = kernfs_info(sb);
- struct kernfs_super_info *info = data;
+ struct kernfs_super_info *info = fc->s_fs_info;
return sb_info->root == info->root && sb_info->ns == info->ns;
}
-static int kernfs_set_super(struct super_block *sb, void *data)
+static int kernfs_set_super(struct super_block *sb, struct fs_context *fc)
{
- int error;
- error = set_anon_super(sb, data);
- if (!error)
- sb->s_fs_info = data;
- return error;
+ struct kernfs_fs_context *kfc = fc->fs_private;
+
+ kfc->ns_tag = NULL;
+ return set_anon_super_fc(sb, fc);
}
/**
@@ -287,63 +281,60 @@
}
/**
- * kernfs_mount_ns - kernfs mount helper
- * @fs_type: file_system_type of the fs being mounted
- * @flags: mount flags specified for the mount
- * @root: kernfs_root of the hierarchy being mounted
- * @magic: file system specific magic number
- * @new_sb_created: tell the caller if we allocated a new superblock
- * @ns: optional namespace tag of the mount
+ * kernfs_get_tree - kernfs filesystem access/retrieval helper
+ * @fc: The filesystem context.
*
- * This is to be called from each kernfs user's file_system_type->mount()
- * implementation, which should pass through the specified @fs_type and
- * @flags, and specify the hierarchy and namespace tag to mount via @root
- * and @ns, respectively.
- *
- * The return value can be passed to the vfs layer verbatim.
+ * This is to be called from each kernfs user's fs_context->ops->get_tree()
+ * implementation, which should set the specified ->@fs_type and ->@flags, and
+ * specify the hierarchy and namespace tag to mount via ->@root and ->@ns,
+ * respectively.
*/
-struct dentry *kernfs_mount_ns(struct file_system_type *fs_type, int flags,
- struct kernfs_root *root, unsigned long magic,
- bool *new_sb_created, const void *ns)
+int kernfs_get_tree(struct fs_context *fc)
{
+ struct kernfs_fs_context *kfc = fc->fs_private;
struct super_block *sb;
struct kernfs_super_info *info;
int error;
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
- return ERR_PTR(-ENOMEM);
+ return -ENOMEM;
- info->root = root;
- info->ns = ns;
+ info->root = kfc->root;
+ info->ns = kfc->ns_tag;
INIT_LIST_HEAD(&info->node);
- sb = sget_userns(fs_type, kernfs_test_super, kernfs_set_super, flags,
- &init_user_ns, info);
- if (IS_ERR(sb) || sb->s_fs_info != info)
- kfree(info);
+ fc->s_fs_info = info;
+ sb = sget_fc(fc, kernfs_test_super, kernfs_set_super);
if (IS_ERR(sb))
- return ERR_CAST(sb);
-
- if (new_sb_created)
- *new_sb_created = !sb->s_root;
+ return PTR_ERR(sb);
if (!sb->s_root) {
struct kernfs_super_info *info = kernfs_info(sb);
- error = kernfs_fill_super(sb, magic);
+ kfc->new_sb_created = true;
+
+ error = kernfs_fill_super(sb, kfc);
if (error) {
deactivate_locked_super(sb);
- return ERR_PTR(error);
+ return error;
}
sb->s_flags |= SB_ACTIVE;
mutex_lock(&kernfs_mutex);
- list_add(&info->node, &root->supers);
+ list_add(&info->node, &info->root->supers);
mutex_unlock(&kernfs_mutex);
}
- return dget(sb->s_root);
+ fc->root = dget(sb->s_root);
+ return 0;
+}
+
+void kernfs_free_fs_context(struct fs_context *fc)
+{
+ /* Note that we don't deal with kfc->ns_tag here. */
+ kfree(fc->s_fs_info);
+ fc->s_fs_info = NULL;
}
/**
@@ -370,36 +361,6 @@
kfree(info);
}
-/**
- * kernfs_pin_sb: try to pin the superblock associated with a kernfs_root
- * @kernfs_root: the kernfs_root in question
- * @ns: the namespace tag
- *
- * Pin the superblock so the superblock won't be destroyed in subsequent
- * operations. This can be used to block ->kill_sb() which may be useful
- * for kernfs users which dynamically manage superblocks.
- *
- * Returns NULL if there's no superblock associated to this kernfs_root, or
- * -EINVAL if the superblock is being freed.
- */
-struct super_block *kernfs_pin_sb(struct kernfs_root *root, const void *ns)
-{
- struct kernfs_super_info *info;
- struct super_block *sb = NULL;
-
- mutex_lock(&kernfs_mutex);
- list_for_each_entry(info, &root->supers, node) {
- if (info->ns == ns) {
- sb = info->sb;
- if (!atomic_inc_not_zero(&info->sb->s_active))
- sb = ERR_PTR(-EINVAL);
- break;
- }
- }
- mutex_unlock(&kernfs_mutex);
- return sb;
-}
-
void __init kernfs_init(void)
{
@@ -414,4 +375,9 @@
0,
SLAB_PANIC | SLAB_TYPESAFE_BY_RCU,
NULL);
+
+ /* Creates slab cache for kernfs inode attributes */
+ kernfs_iattrs_cache = kmem_cache_create("kernfs_iattrs_cache",
+ sizeof(struct kernfs_iattrs),
+ 0, SLAB_PANIC, NULL);
}
diff --git a/fs/kernfs/symlink.c b/fs/kernfs/symlink.c
index 305b220..5432883 100644
--- a/fs/kernfs/symlink.c
+++ b/fs/kernfs/symlink.c
@@ -1,11 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* fs/kernfs/symlink.c - kernfs symlink implementation
*
* Copyright (c) 2001-3 Patrick Mochel
* Copyright (c) 2007 SUSE Linux Products GmbH
* Copyright (c) 2007, 2013 Tejun Heo <tj@kernel.org>
- *
- * This file is released under the GPLv2.
*/
#include <linux/fs.h>
@@ -33,8 +32,8 @@
kgid_t gid = GLOBAL_ROOT_GID;
if (target->iattr) {
- uid = target->iattr->ia_iattr.ia_uid;
- gid = target->iattr->ia_iattr.ia_gid;
+ uid = target->iattr->ia_uid;
+ gid = target->iattr->ia_gid;
}
kn = kernfs_new_node(parent, name, S_IFLNK|S_IRWXUGO, uid, gid,
@@ -72,6 +71,9 @@
if (base == kn)
break;
+ if ((s - path) + 3 >= PATH_MAX)
+ return -ENAMETOOLONG;
+
strcpy(s, "../");
s += 3;
base = base->parent;
@@ -88,7 +90,7 @@
if (len < 2)
return -EINVAL;
len--;
- if ((s - path) + len > PATH_MAX)
+ if ((s - path) + len >= PATH_MAX)
return -ENAMETOOLONG;
/* reverse fillup of target string from target to base */