1 files changed, 25 insertions, 167 deletions

diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index c6e917d360f7..0d66722c6a52 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -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);
 }
@@ -496,19 +498,6 @@ static int __remove_xattr(struct ceph_inode_info *ci,
 	return 0;
 }
 
-static int __remove_xattr_by_name(struct ceph_inode_info *ci,
-			   const char *name)
-{
-	struct rb_node **p;
-	struct ceph_inode_xattr *xattr;
-	int err;
-
-	p = &ci->i_xattrs.index.rb_node;
-	xattr = __get_xattr(ci, name);
-	err = __remove_xattr(ci, xattr);
-	return err;
-}
-
 static char *__copy_xattr_names(struct ceph_inode_info *ci,
 				char *dest)
 {
@@ -740,9 +729,6 @@ 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 +790,6 @@ 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);
@@ -877,11 +854,10 @@ out:
 	return err;
 }
 
-static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
+static int ceph_sync_setxattr(struct inode *inode, const char *name,
 			      const char *value, size_t size, int flags)
 {
-	struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
-	struct inode *inode = d_inode(dentry);
+	struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
 	struct ceph_inode_info *ci = ceph_inode(inode);
 	struct ceph_mds_request *req;
 	struct ceph_mds_client *mdsc = fsc->mdsc;
@@ -939,13 +915,12 @@ out:
 	return err;
 }
 
-int __ceph_setxattr(struct dentry *dentry, const char *name,
+int __ceph_setxattr(struct inode *inode, const char *name,
 			const void *value, size_t size, int flags)
 {
-	struct inode *inode = d_inode(dentry);
 	struct ceph_vxattr *vxattr;
 	struct ceph_inode_info *ci = ceph_inode(inode);
-	struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
+	struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
 	struct ceph_cap_flush *prealloc_cf = NULL;
 	int issued;
 	int err;
@@ -958,8 +933,8 @@ int __ceph_setxattr(struct dentry *dentry, 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)
@@ -1056,7 +1031,7 @@ do_sync_unlocked:
 				    "during filling trace\n", inode);
 		err = -EBUSY;
 	} else {
-		err = ceph_sync_setxattr(dentry, name, value, size, flags);
+		err = ceph_sync_setxattr(inode, name, value, size, flags);
 	}
 out:
 	ceph_free_cap_flush(prealloc_cf);
@@ -1066,146 +1041,29 @@ 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(dentry, name, value, size, flags);
-}
-
-static int ceph_send_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)
 {
-	struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
-	struct ceph_mds_client *mdsc = fsc->mdsc;
-	struct inode *inode = d_inode(dentry);
-	struct ceph_mds_request *req;
-	int err;
-
-	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR,
-				       USE_AUTH_MDS);
-	if (IS_ERR(req))
-		return PTR_ERR(req);
-	req->r_path2 = kstrdup(name, GFP_NOFS);
-	if (!req->r_path2)
-		return -ENOMEM;
-
-	req->r_inode = inode;
-	ihold(inode);
-	req->r_num_caps = 1;
-	req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
-	err = ceph_mdsc_do_request(mdsc, NULL, req);
-	ceph_mdsc_put_request(req);
-	return err;
+	if (!ceph_is_valid_xattr(name))
+		return -EOPNOTSUPP;
+	return __ceph_getxattr(inode, name, value, size);
 }
 
-int __ceph_removexattr(struct dentry *dentry, const char *name)
+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)
 {
-	struct inode *inode = d_inode(dentry);
-	struct ceph_vxattr *vxattr;
-	struct ceph_inode_info *ci = ceph_inode(inode);
-	struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
-	struct ceph_cap_flush *prealloc_cf = NULL;
-	int issued;
-	int err;
-	int required_blob_size;
-	int dirty;
-	bool lock_snap_rwsem = false;
-
 	if (!ceph_is_valid_xattr(name))
 		return -EOPNOTSUPP;
-
-	vxattr = ceph_match_vxattr(inode, name);
-	if (vxattr && vxattr->readonly)
-		return -EOPNOTSUPP;
-
-	/* pass any unhandled ceph.* xattrs through to the MDS */
-	if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
-		goto do_sync_unlocked;
-
-	prealloc_cf = ceph_alloc_cap_flush();
-	if (!prealloc_cf)
-		return -ENOMEM;
-
-	err = -ENOMEM;
-	spin_lock(&ci->i_ceph_lock);
-retry:
-	issued = __ceph_caps_issued(ci, NULL);
-	if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))
-		goto do_sync;
-
-	if (!lock_snap_rwsem && !ci->i_head_snapc) {
-		lock_snap_rwsem = true;
-		if (!down_read_trylock(&mdsc->snap_rwsem)) {
-			spin_unlock(&ci->i_ceph_lock);
-			down_read(&mdsc->snap_rwsem);
-			spin_lock(&ci->i_ceph_lock);
-			goto retry;
-		}
-	}
-
-	dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued));
-
-	__build_xattrs(inode);
-
-	required_blob_size = __get_required_blob_size(ci, 0, 0);
-
-	if (!ci->i_xattrs.prealloc_blob ||
-	    required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
-		struct ceph_buffer *blob;
-
-		spin_unlock(&ci->i_ceph_lock);
-		dout(" preaallocating new blob size=%d\n", required_blob_size);
-		blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
-		if (!blob)
-			goto do_sync_unlocked;
-		spin_lock(&ci->i_ceph_lock);
-		if (ci->i_xattrs.prealloc_blob)
-			ceph_buffer_put(ci->i_xattrs.prealloc_blob);
-		ci->i_xattrs.prealloc_blob = blob;
-		goto retry;
-	}
-
-	err = __remove_xattr_by_name(ceph_inode(inode), name);
-
-	dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL,
-				       &prealloc_cf);
-	ci->i_xattrs.dirty = true;
-	inode->i_ctime = current_fs_time(inode->i_sb);
-	spin_unlock(&ci->i_ceph_lock);
-	if (lock_snap_rwsem)
-		up_read(&mdsc->snap_rwsem);
-	if (dirty)
-		__mark_inode_dirty(inode, dirty);
-	ceph_free_cap_flush(prealloc_cf);
-	return err;
-do_sync:
-	spin_unlock(&ci->i_ceph_lock);
-do_sync_unlocked:
-	if (lock_snap_rwsem)
-		up_read(&mdsc->snap_rwsem);
-	ceph_free_cap_flush(prealloc_cf);
-	err = ceph_send_removexattr(dentry, name);
-	return err;
+	return __ceph_setxattr(d_inode(dentry), name, value, size, flags);
 }
 
-int ceph_removexattr(struct dentry *dentry, const char *name)
-{
-	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(dentry, name);
-}
+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)