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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Browse source 
Pull remaining vfs xattr work from Al Viro:
 "The rest of work.xattr (non-cifs conversions)"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  btrfs: Switch to generic xattr handlers
  ubifs: Switch to generic xattr handlers
  jfs: Switch to generic xattr handlers
  jfs: Clean up xattr name mapping
  gfs2: Switch to generic xattr handlers
  ceph: kill __ceph_removexattr()
  ceph: Switch to generic xattr handlers
  ceph: Get rid of d_find_alias in ceph_set_acl
This commit is contained in:
Linus Torvalds 2016-05-18 10:08:45 -07:00
commit ba5a2655c2
22 changed files with 338 additions and 563 deletions
Download patch file Download diff file Expand all files Collapse all files

6
fs/jfs/file.c
View file

@ -140,10 +140,10 @@ int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
}
const struct inode_operations jfs_file_inode_operations = {
.setxattr = jfs_setxattr,
.getxattr = jfs_getxattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = jfs_listxattr,
.removexattr = jfs_removexattr,
.removexattr = generic_removexattr,
.setattr = jfs_setattr,
#ifdef CONFIG_JFS_POSIX_ACL
.get_acl = jfs_get_acl,

6
fs/jfs/jfs_xattr.h
View file

@ -19,6 +19,8 @@
#ifndef H_JFS_XATTR
#define H_JFS_XATTR
#include <linux/xattr.h>
/*
* jfs_ea_list describe the on-disk format of the extended attributes.
* I know the null-terminator is redundant since namelen is stored, but
@ -54,12 +56,8 @@ struct jfs_ea_list {
extern int __jfs_setxattr(tid_t, struct inode *, const char *, const void *,
size_t, int);
extern int jfs_setxattr(struct dentry *, const char *, const void *, size_t,
int);
extern ssize_t __jfs_getxattr(struct inode *, const char *, void *, size_t);
extern ssize_t jfs_getxattr(struct dentry *, struct inode *, const char *, void *, size_t);
extern ssize_t jfs_listxattr(struct dentry *, char *, size_t);
extern int jfs_removexattr(struct dentry *, const char *);
extern const struct xattr_handler *jfs_xattr_handlers[];

6
fs/jfs/namei.c
View file

@ -1537,10 +1537,10 @@ const struct inode_operations jfs_dir_inode_operations = {
.rmdir = jfs_rmdir,
.mknod = jfs_mknod,
.rename = jfs_rename,
.setxattr = jfs_setxattr,
.getxattr = jfs_getxattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = jfs_listxattr,
.removexattr = jfs_removexattr,
.removexattr = generic_removexattr,
.setattr = jfs_setattr,
#ifdef CONFIG_JFS_POSIX_ACL
.get_acl = jfs_get_acl,

12
fs/jfs/symlink.c
View file

@ -25,19 +25,19 @@ const struct inode_operations jfs_fast_symlink_inode_operations = {
.readlink = generic_readlink,
.get_link = simple_get_link,
.setattr = jfs_setattr,
.setxattr = jfs_setxattr,
.getxattr = jfs_getxattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = jfs_listxattr,
.removexattr = jfs_removexattr,
.removexattr = generic_removexattr,
};
const struct inode_operations jfs_symlink_inode_operations = {
.readlink = generic_readlink,
.get_link = page_get_link,
.setattr = jfs_setattr,
.setxattr = jfs_setxattr,
.getxattr = jfs_getxattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = jfs_listxattr,
.removexattr = jfs_removexattr,
.removexattr = generic_removexattr,
};

224
fs/jfs/xattr.c
View file

@ -86,6 +86,14 @@ struct ea_buffer {
#define EA_MALLOC 0x0008
/*
* Mapping of on-disk attribute names: for on-disk attribute names with an
* unknown prefix (not "system.", "user.", "security.", or "trusted."), the
* prefix "os2." is prepended. On the way back to disk, "os2." prefixes are
* stripped and we make sure that the remaining name does not start with one
* of the know prefixes.
*/
static int is_known_namespace(const char *name)
{
if (strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) &&
@ -97,29 +105,19 @@ static int is_known_namespace(const char *name)
return true;
}
/*
* These three routines are used to recognize on-disk extended attributes
* that are in a recognized namespace. If the attribute is not recognized,
* "os2." is prepended to the name
*/
static int is_os2_xattr(struct jfs_ea *ea)
{
return !is_known_namespace(ea->name);
}
static inline int name_size(struct jfs_ea *ea)
{
if (is_os2_xattr(ea))
return ea->namelen + XATTR_OS2_PREFIX_LEN;
else
if (is_known_namespace(ea->name))
return ea->namelen;
else
return ea->namelen + XATTR_OS2_PREFIX_LEN;
}
static inline int copy_name(char *buffer, struct jfs_ea *ea)
{
int len = ea->namelen;
if (is_os2_xattr(ea)) {
if (!is_known_namespace(ea->name)) {
memcpy(buffer, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN);
buffer += XATTR_OS2_PREFIX_LEN;
len += XATTR_OS2_PREFIX_LEN;
@ -665,35 +663,6 @@ static int ea_put(tid_t tid, struct inode *inode, struct ea_buffer *ea_buf,
return 0;
}
/*
* Most of the permission checking is done by xattr_permission in the vfs.
* We also need to verify that this is a namespace that we recognize.
*/
static int can_set_xattr(struct inode *inode, const char *name,
const void *value, size_t value_len)
{
if (!strncmp(name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN)) {
/*
* This makes sure that we aren't trying to set an
* attribute in a different namespace by prefixing it
* with "os2."
*/
if (is_known_namespace(name + XATTR_OS2_PREFIX_LEN))
return -EOPNOTSUPP;
return 0;
}
/*
* Don't allow setting an attribute in an unknown namespace.
*/
if (strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) &&
strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) &&
strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
return -EOPNOTSUPP;
return 0;
}
int __jfs_setxattr(tid_t tid, struct inode *inode, const char *name,
const void *value, size_t value_len, int flags)
{
@ -704,21 +673,10 @@ int __jfs_setxattr(tid_t tid, struct inode *inode, const char *name,
int xattr_size;
int new_size;
int namelen = strlen(name);
char *os2name = NULL;
int found = 0;
int rc;
int length;
if (strncmp(name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
os2name = kmalloc(namelen - XATTR_OS2_PREFIX_LEN + 1,
GFP_KERNEL);
if (!os2name)
return -ENOMEM;
strcpy(os2name, name + XATTR_OS2_PREFIX_LEN);
name = os2name;
namelen -= XATTR_OS2_PREFIX_LEN;
}
down_write(&JFS_IP(inode)->xattr_sem);
xattr_size = ea_get(inode, &ea_buf, 0);
@ -841,44 +799,6 @@ int __jfs_setxattr(tid_t tid, struct inode *inode, const char *name,
out:
up_write(&JFS_IP(inode)->xattr_sem);
kfree(os2name);
return rc;
}
int jfs_setxattr(struct dentry *dentry, const char *name, const void *value,
size_t value_len, int flags)
{
struct inode *inode = d_inode(dentry);
struct jfs_inode_info *ji = JFS_IP(inode);
int rc;
tid_t tid;
/*
* If this is a request for a synthetic attribute in the system.*
* namespace use the generic infrastructure to resolve a handler
* for it via sb->s_xattr.
*/
if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
return generic_setxattr(dentry, name, value, value_len, flags);
if ((rc = can_set_xattr(inode, name, value, value_len)))
return rc;
if (value == NULL) { /* empty EA, do not remove */
value = "";
value_len = 0;
}
tid = txBegin(inode->i_sb, 0);
mutex_lock(&ji->commit_mutex);
rc = __jfs_setxattr(tid, d_inode(dentry), name, value, value_len,
flags);
if (!rc)
rc = txCommit(tid, 1, &inode, 0);
txEnd(tid);
mutex_unlock(&ji->commit_mutex);
return rc;
}
@ -933,37 +853,6 @@ ssize_t __jfs_getxattr(struct inode *inode, const char *name, void *data,
return size;
}
ssize_t jfs_getxattr(struct dentry *dentry, struct inode *inode,
const char *name, void *data, size_t buf_size)
{
int err;
/*
* If this is a request for a synthetic attribute in the system.*
* namespace use the generic infrastructure to resolve a handler
* for it via sb->s_xattr.
*/
if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
return generic_getxattr(dentry, inode, name, data, buf_size);
if (strncmp(name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
/*
* skip past "os2." prefix
*/
name += XATTR_OS2_PREFIX_LEN;
/*
* Don't allow retrieving properly prefixed attributes
* by prepending them with "os2."
*/
if (is_known_namespace(name))
return -EOPNOTSUPP;
}
err = __jfs_getxattr(inode, name, data, buf_size);
return err;
}
/*
* No special permissions are needed to list attributes except for trusted.*
*/
@ -1027,27 +916,16 @@ ssize_t jfs_listxattr(struct dentry * dentry, char *data, size_t buf_size)
return size;
}
int jfs_removexattr(struct dentry *dentry, const char *name)
static int __jfs_xattr_set(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
struct inode *inode = d_inode(dentry);
struct jfs_inode_info *ji = JFS_IP(inode);
int rc;
tid_t tid;
/*
* If this is a request for a synthetic attribute in the system.*
* namespace use the generic infrastructure to resolve a handler
* for it via sb->s_xattr.
*/
if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
return generic_removexattr(dentry, name);
if ((rc = can_set_xattr(inode, name, NULL, 0)))
return rc;
int rc;
tid = txBegin(inode->i_sb, 0);
mutex_lock(&ji->commit_mutex);
rc = __jfs_setxattr(tid, d_inode(dentry), name, NULL, 0, XATTR_REPLACE);
rc = __jfs_setxattr(tid, inode, name, value, size, flags);
if (!rc)
rc = txCommit(tid, 1, &inode, 0);
txEnd(tid);
@ -1056,15 +934,77 @@ int jfs_removexattr(struct dentry *dentry, const char *name)
return rc;
}
/*
* List of handlers for synthetic system.* attributes. All real ondisk
* attributes are handled directly.
*/
static int jfs_xattr_get(const struct xattr_handler *handler,
struct dentry *unused, struct inode *inode,
const char *name, void *value, size_t size)
{
name = xattr_full_name(handler, name);
return __jfs_getxattr(inode, name, value, size);
}
static int jfs_xattr_set(const struct xattr_handler *handler,
struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
struct inode *inode = d_inode(dentry);
name = xattr_full_name(handler, name);
return __jfs_xattr_set(inode, name, value, size, flags);
}
static int jfs_xattr_get_os2(const struct xattr_handler *handler,
struct dentry *unused, struct inode *inode,
const char *name, void *value, size_t size)
{
if (is_known_namespace(name))
return -EOPNOTSUPP;
return __jfs_getxattr(inode, name, value, size);
}
static int jfs_xattr_set_os2(const struct xattr_handler *handler,
struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
struct inode *inode = d_inode(dentry);
if (is_known_namespace(name))
return -EOPNOTSUPP;
return __jfs_xattr_set(inode, name, value, size, flags);
}
static const struct xattr_handler jfs_user_xattr_handler = {
.prefix = XATTR_USER_PREFIX,
.get = jfs_xattr_get,
.set = jfs_xattr_set,
};
static const struct xattr_handler jfs_os2_xattr_handler = {
.prefix = XATTR_OS2_PREFIX,
.get = jfs_xattr_get_os2,
.set = jfs_xattr_set_os2,
};
static const struct xattr_handler jfs_security_xattr_handler = {
.prefix = XATTR_SECURITY_PREFIX,
.get = jfs_xattr_get,
.set = jfs_xattr_set,
};
static const struct xattr_handler jfs_trusted_xattr_handler = {
.prefix = XATTR_TRUSTED_PREFIX,
.get = jfs_xattr_get,
.set = jfs_xattr_set,
};
const struct xattr_handler *jfs_xattr_handlers[] = {
#ifdef CONFIG_JFS_POSIX_ACL
&posix_acl_access_xattr_handler,
&posix_acl_default_xattr_handler,
#endif
&jfs_os2_xattr_handler,
&jfs_user_xattr_handler,
&jfs_security_xattr_handler,
&jfs_trusted_xattr_handler,
NULL,
};