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

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

5 files changed, 53 insertions, 197 deletions

diff --git a/fs/ceph/acl.c b/fs/ceph/acl.c
index 5457f216e2e5..4f67227f69a5 100644
--- a/fs/ceph/acl.c
+++ b/fs/ceph/acl.c
@@ -90,7 +90,6 @@ int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 	char *value = NULL;
 	struct iattr newattrs;
 	umode_t new_mode = inode->i_mode, old_mode = inode->i_mode;
-	struct dentry *dentry;
 
 	switch (type) {
 	case ACL_TYPE_ACCESS:
@@ -128,29 +127,26 @@ int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 			goto out_free;
 	}
 
-	dentry = d_find_alias(inode);
 	if (new_mode != old_mode) {
 		newattrs.ia_mode = new_mode;
 		newattrs.ia_valid = ATTR_MODE;
-		ret = ceph_setattr(dentry, &newattrs);
+		ret = __ceph_setattr(inode, &newattrs);
 		if (ret)
-			goto out_dput;
+			goto out_free;
 	}
 
-	ret = __ceph_setxattr(dentry, name, value, size, 0);
+	ret = __ceph_setxattr(inode, name, value, size, 0);
 	if (ret) {
 		if (new_mode != old_mode) {
 			newattrs.ia_mode = old_mode;
 			newattrs.ia_valid = ATTR_MODE;
-			ceph_setattr(dentry, &newattrs);
+			__ceph_setattr(inode, &newattrs);
 		}
-		goto out_dput;
+		goto out_free;
 	}
 
 	ceph_set_cached_acl(inode, type, acl);
 
-out_dput:
-	dput(dentry);
 out_free:
 	kfree(value);
 out:
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 4fb2bbc2a272..3ab1192d2029 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -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,
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index edfade037738..e669cfa9d793 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -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,
 };
@@ -1770,22 +1771,18 @@ 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,
 };
 
-/*
- * setattr
- */
-int ceph_setattr(struct dentry *dentry, struct iattr *attr)
+int __ceph_setattr(struct inode *inode, struct iattr *attr)
 {
-	struct inode *inode = d_inode(dentry);
 	struct ceph_inode_info *ci = ceph_inode(inode);
 	const unsigned int ia_valid = attr->ia_valid;
 	struct ceph_mds_request *req;
-	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;
 	int issued;
 	int release = 0, dirtied = 0;
@@ -2010,6 +2007,14 @@ out_put:
 }
 
 /*
+ * setattr
+ */
+int ceph_setattr(struct dentry *dentry, struct iattr *attr)
+{
+	return __ceph_setattr(d_inode(dentry), attr);
+}
+
+/*
  * Verify that we have a lease on the given mask.  If not,
  * do a getattr against an mds.
  */
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index beb893bb234f..7b99eb756477 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -785,19 +785,15 @@ static inline int ceph_do_getattr(struct inode *inode, int mask, bool force)
 	return __ceph_do_getattr(inode, NULL, mask, force);
 }
 extern int ceph_permission(struct inode *inode, int mask);
+extern int __ceph_setattr(struct inode *inode, struct iattr *attr);
 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
 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 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);
-int __ceph_removexattr(struct dentry *, const char *);
-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);
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)