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kernfs: Switch to generic xattr handlers

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Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Andreas Gruenbacher 2016-09-29 17:48:33 +02:00 committed by Al Viro
parent b8020eff7f
commit e72a1a8b3a
5 changed files with 92 additions and 86 deletions
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6
fs/kernfs/dir.c
View File

@ -1126,9 +1126,9 @@ const struct inode_operations kernfs_dir_iops = {
.permission = kernfs_iop_permission,
.setattr = kernfs_iop_setattr,
.getattr = kernfs_iop_getattr,
.setxattr = kernfs_iop_setxattr,
.removexattr = kernfs_iop_removexattr,
.getxattr = kernfs_iop_getxattr,
.setxattr = generic_setxattr,
.removexattr = generic_removexattr,
.getxattr = generic_getxattr,
.listxattr = kernfs_iop_listxattr,
.mkdir = kernfs_iop_mkdir,

158
fs/kernfs/inode.c
View File

@ -28,9 +28,9 @@ static const struct inode_operations kernfs_iops = {
.permission = kernfs_iop_permission,
.setattr = kernfs_iop_setattr,
.getattr = kernfs_iop_getattr,
.setxattr = kernfs_iop_setxattr,
.removexattr = kernfs_iop_removexattr,
.getxattr = kernfs_iop_getxattr,
.setxattr = generic_setxattr,
.removexattr = generic_removexattr,
.getxattr = generic_getxattr,
.listxattr = kernfs_iop_listxattr,
};
@ -138,17 +138,12 @@ int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr)
return error;
}
static int kernfs_node_setsecdata(struct kernfs_node *kn, void **secdata,
static int kernfs_node_setsecdata(struct kernfs_iattrs *attrs, void **secdata,
u32 *secdata_len)
{
struct kernfs_iattrs *attrs;
void *old_secdata;
size_t old_secdata_len;
attrs = kernfs_iattrs(kn);
if (!attrs)
return -ENOMEM;
old_secdata = attrs->ia_secdata;
old_secdata_len = attrs->ia_secdata_len;
@ -160,71 +155,6 @@ static int kernfs_node_setsecdata(struct kernfs_node *kn, void **secdata,
return 0;
}
int kernfs_iop_setxattr(struct dentry *unused, struct inode *inode,
const char *name, const void *value,
size_t size, int flags)
{
struct kernfs_node *kn = inode->i_private;
struct kernfs_iattrs *attrs;
void *secdata;
int error;
u32 secdata_len = 0;
attrs = kernfs_iattrs(kn);
if (!attrs)
return -ENOMEM;
if (!strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN)) {
const char *suffix = name + XATTR_SECURITY_PREFIX_LEN;
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(kn, &secdata, &secdata_len);
mutex_unlock(&kernfs_mutex);
if (secdata)
security_release_secctx(secdata, secdata_len);
return error;
} else if (!strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN)) {
return simple_xattr_set(&attrs->xattrs, name, value, size,
flags);
}
return -EINVAL;
}
int kernfs_iop_removexattr(struct dentry *dentry, const char *name)
{
struct kernfs_node *kn = dentry->d_fsdata;
struct kernfs_iattrs *attrs;
attrs = kernfs_iattrs(kn);
if (!attrs)
return -ENOMEM;
return simple_xattr_set(&attrs->xattrs, name, NULL, 0, XATTR_REPLACE);
}
ssize_t kernfs_iop_getxattr(struct dentry *unused, struct inode *inode,
const char *name, void *buf, size_t size)
{
struct kernfs_node *kn = inode->i_private;
struct kernfs_iattrs *attrs;
attrs = kernfs_iattrs(kn);
if (!attrs)
return -ENOMEM;
return simple_xattr_get(&attrs->xattrs, name, buf, size);
}
ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size)
{
struct kernfs_node *kn = dentry->d_fsdata;
@ -376,3 +306,83 @@ int kernfs_iop_permission(struct inode *inode, int mask)
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)
{
const char *name = xattr_full_name(handler, suffix);
struct kernfs_node *kn = inode->i_private;
struct kernfs_iattrs *attrs;
attrs = kernfs_iattrs(kn);
if (!attrs)
return -ENOMEM;
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)
{
const char *name = xattr_full_name(handler, suffix);
struct kernfs_node *kn = inode->i_private;
struct kernfs_iattrs *attrs;
attrs = kernfs_iattrs(kn);
if (!attrs)
return -ENOMEM;
return simple_xattr_set(&attrs->xattrs, name, value, size, flags);
}
const struct xattr_handler kernfs_trusted_xattr_handler = {
.prefix = XATTR_TRUSTED_PREFIX,
.get = kernfs_xattr_get,
.set = kernfs_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;
}
const struct xattr_handler kernfs_security_xattr_handler = {
.prefix = XATTR_SECURITY_PREFIX,
.get = kernfs_xattr_get,
.set = kernfs_security_xattr_set,
};
const struct xattr_handler *kernfs_xattr_handlers[] = {
&kernfs_trusted_xattr_handler,
&kernfs_security_xattr_handler,
NULL
};

7
fs/kernfs/kernfs-internal.h
View File

@ -76,17 +76,12 @@ extern struct kmem_cache *kernfs_node_cache;
/*
* inode.c
*/
extern const struct xattr_handler *kernfs_xattr_handlers[];
void kernfs_evict_inode(struct inode *inode);
int kernfs_iop_permission(struct inode *inode, int mask);
int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr);
int kernfs_iop_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat);
int kernfs_iop_setxattr(struct dentry *dentry, struct inode *inode,
const char *name, const void *value,
size_t size, int flags);
int kernfs_iop_removexattr(struct dentry *dentry, const char *name);
ssize_t kernfs_iop_getxattr(struct dentry *dentry, struct inode *inode,
const char *name, void *buf, size_t size);
ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
/*

1
fs/kernfs/mount.c
View File

@ -158,6 +158,7 @@ static int kernfs_fill_super(struct super_block *sb, unsigned long magic)
sb->s_blocksize_bits = PAGE_SHIFT;
sb->s_magic = magic;
sb->s_op = &kernfs_sops;
sb->s_xattr = kernfs_xattr_handlers;
sb->s_time_gran = 1;
/* get root inode, initialize and unlock it */

6
fs/kernfs/symlink.c
View File

@ -134,9 +134,9 @@ static const char *kernfs_iop_get_link(struct dentry *dentry,
}
const struct inode_operations kernfs_symlink_iops = {
.setxattr = kernfs_iop_setxattr,
.removexattr = kernfs_iop_removexattr,
.getxattr = kernfs_iop_getxattr,
.setxattr = generic_setxattr,
.removexattr = generic_removexattr,
.getxattr = generic_getxattr,
.listxattr = kernfs_iop_listxattr,
.readlink = generic_readlink,
.get_link = kernfs_iop_get_link,