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ceph: Switch to generic xattr handlers 

Add a catch-all xattr handler at the end of ceph_xattr_handlers.  Check
for valid attribute names there, and remove those checks from
__ceph_{get,set,remove}xattr instead.  No "system.*" xattrs need to be
handled by the catch-all handler anymore.

The set xattr handler is called with a NULL value to indicate that the
attribute should be removed; __ceph_setxattr already handles that case
correctly (ceph_set_acl could already calling __ceph_setxattr with a NULL
value).

Move the check for snapshots from ceph_{set,remove}xattr into
__ceph_{set,remove}xattr.  With that, ceph_{get,set,remove}xattr can be
replaced with the generic iops.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Andreas Gruenbacher 2016-04-14 00:30:17 +02:00 committed by Al Viro
parent a26feccaba
commit 2cdeb1e472
4 changed files with 39 additions and 53 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
fs/ceph/dir.c
View File

@ -5,6 +5,7 @@
#include <linux/namei.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/xattr.h>
#include "super.h"
#include "mds_client.h"
@ -1342,10 +1343,10 @@ const struct inode_operations ceph_dir_iops = {
.permission = ceph_permission,
.getattr = ceph_getattr,
.setattr = ceph_setattr,
.setxattr = ceph_setxattr,
.getxattr = ceph_getxattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = ceph_listxattr,
.removexattr = ceph_removexattr,
.removexattr = generic_removexattr,
.get_acl = ceph_get_acl,
.set_acl = ceph_set_acl,
.mknod = ceph_mknod,

13
fs/ceph/inode.c
View File

@ -8,6 +8,7 @@
#include <linux/kernel.h>
#include <linux/writeback.h>
#include <linux/vmalloc.h>
#include <linux/xattr.h>
#include <linux/posix_acl.h>
#include <linux/random.h>
@ -92,10 +93,10 @@ const struct inode_operations ceph_file_iops = {
.permission = ceph_permission,
.setattr = ceph_setattr,
.getattr = ceph_getattr,
.setxattr = ceph_setxattr,
.getxattr = ceph_getxattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = ceph_listxattr,
.removexattr = ceph_removexattr,
.removexattr = generic_removexattr,
.get_acl = ceph_get_acl,
.set_acl = ceph_set_acl,
};
@ -1770,10 +1771,10 @@ static const struct inode_operations ceph_symlink_iops = {
.get_link = simple_get_link,
.setattr = ceph_setattr,
.getattr = ceph_getattr,
.setxattr = ceph_setxattr,
.getxattr = ceph_getxattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = ceph_listxattr,
.removexattr = ceph_removexattr,
.removexattr = generic_removexattr,
};
int __ceph_setattr(struct inode *inode, struct iattr *attr)

4
fs/ceph/super.h
View File

@ -791,13 +791,9 @@ extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat);
/* xattr.c */
extern int ceph_setxattr(struct dentry *, const char *, const void *,
size_t, int);
int __ceph_setxattr(struct inode *, const char *, const void *, size_t, int);
ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t);
extern ssize_t ceph_getxattr(struct dentry *, struct inode *, const char *, void *, size_t);
extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
extern int ceph_removexattr(struct dentry *, const char *);
extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
extern void __init ceph_xattr_init(void);

68
fs/ceph/xattr.c
View File

@ -16,6 +16,8 @@
static int __remove_xattr(struct ceph_inode_info *ci,
struct ceph_inode_xattr *xattr);
const struct xattr_handler ceph_other_xattr_handler;
/*
* List of handlers for synthetic system.* attributes. Other
* attributes are handled directly.
@ -25,6 +27,7 @@ const struct xattr_handler *ceph_xattr_handlers[] = {
&posix_acl_access_xattr_handler,
&posix_acl_default_xattr_handler,
#endif
&ceph_other_xattr_handler,
NULL,
};
@ -33,7 +36,6 @@ static bool ceph_is_valid_xattr(const char *name)
return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) ||
!strncmp(name, XATTR_SECURITY_PREFIX,
XATTR_SECURITY_PREFIX_LEN) ||
!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) ||
!strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
!strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
}
@ -740,9 +742,6 @@ ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
int req_mask;
int err;
if (!ceph_is_valid_xattr(name))
return -ENODATA;
/* let's see if a virtual xattr was requested */
vxattr = ceph_match_vxattr(inode, name);
if (vxattr) {
@ -804,15 +803,6 @@ out:
return err;
}
ssize_t ceph_getxattr(struct dentry *dentry, struct inode *inode,
const char *name, void *value, size_t size)
{
if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
return generic_getxattr(dentry, inode, name, value, size);
return __ceph_getxattr(inode, name, value, size);
}
ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
{
struct inode *inode = d_inode(dentry);
@ -956,8 +946,8 @@ int __ceph_setxattr(struct inode *inode, const char *name,
int required_blob_size;
bool lock_snap_rwsem = false;
if (!ceph_is_valid_xattr(name))
return -EOPNOTSUPP;
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
vxattr = ceph_match_vxattr(inode, name);
if (vxattr && vxattr->readonly)
@ -1064,21 +1054,6 @@ out:
return err;
}
int ceph_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
return -EROFS;
if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
return generic_setxattr(dentry, name, value, size, flags);
if (size == 0)
value = ""; /* empty EA, do not remove */
return __ceph_setxattr(d_inode(dentry), name, value, size, flags);
}
static int ceph_send_removexattr(struct inode *inode, const char *name)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
@ -1115,8 +1090,8 @@ static int __ceph_removexattr(struct inode *inode, const char *name)
int dirty;
bool lock_snap_rwsem = false;
if (!ceph_is_valid_xattr(name))
return -EOPNOTSUPP;
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
vxattr = ceph_match_vxattr(inode, name);
if (vxattr && vxattr->readonly)
@ -1192,17 +1167,30 @@ do_sync_unlocked:
return err;
}
int ceph_removexattr(struct dentry *dentry, const char *name)
static int ceph_get_xattr_handler(const struct xattr_handler *handler,
struct dentry *dentry, struct inode *inode,
const char *name, void *value, size_t size)
{
if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
return -EROFS;
if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
return generic_removexattr(dentry, name);
return __ceph_removexattr(d_inode(dentry), name);
if (!ceph_is_valid_xattr(name))
return -EOPNOTSUPP;
return __ceph_getxattr(inode, name, value, size);
}
static int ceph_set_xattr_handler(const struct xattr_handler *handler,
struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
if (!ceph_is_valid_xattr(name))
return -EOPNOTSUPP;
return __ceph_setxattr(d_inode(dentry), name, value, size, flags);
}
const struct xattr_handler ceph_other_xattr_handler = {
.prefix = "", /* match any name => handlers called with full name */
.get = ceph_get_xattr_handler,
.set = ceph_set_xattr_handler,
};
#ifdef CONFIG_SECURITY
bool ceph_security_xattr_wanted(struct inode *in)
{