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btrfs: Switch to generic xattr handlers 

The btrfs_{set,remove}xattr inode operations check for a read-only root
(btrfs_root_readonly) before calling into generic_{set,remove}xattr.  If
this check is moved into __btrfs_setxattr, we can get rid of
btrfs_{set,remove}xattr.

This patch applies to mainline, I would like to keep it together with
the other xattr cleanups if possible, though.  Could you please review?

Thanks,
Andreas

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Andreas Gruenbacher 2016-04-22 22:36:44 +02:00 committed by Al Viro
parent 2b88fc21ca
commit e0d46f5c6e
3 changed files with 11 additions and 30 deletions
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16
fs/btrfs/inode.c
View File

@ -10160,10 +10160,10 @@ static const struct inode_operations btrfs_dir_inode_operations = {
.symlink = btrfs_symlink,
.setattr = btrfs_setattr,
.mknod = btrfs_mknod,
.setxattr = btrfs_setxattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = btrfs_listxattr,
.removexattr = btrfs_removexattr,
.removexattr = generic_removexattr,
.permission = btrfs_permission,
.get_acl = btrfs_get_acl,
.set_acl = btrfs_set_acl,
@ -10237,10 +10237,10 @@ static const struct address_space_operations btrfs_symlink_aops = {
static const struct inode_operations btrfs_file_inode_operations = {
.getattr = btrfs_getattr,
.setattr = btrfs_setattr,
.setxattr = btrfs_setxattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = btrfs_listxattr,
.removexattr = btrfs_removexattr,
.removexattr = generic_removexattr,
.permission = btrfs_permission,
.fiemap = btrfs_fiemap,
.get_acl = btrfs_get_acl,
@ -10251,10 +10251,10 @@ static const struct inode_operations btrfs_special_inode_operations = {
.getattr = btrfs_getattr,
.setattr = btrfs_setattr,
.permission = btrfs_permission,
.setxattr = btrfs_setxattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = btrfs_listxattr,
.removexattr = btrfs_removexattr,
.removexattr = generic_removexattr,
.get_acl = btrfs_get_acl,
.set_acl = btrfs_set_acl,
.update_time = btrfs_update_time,
@ -10265,10 +10265,10 @@ static const struct inode_operations btrfs_symlink_inode_operations = {
.getattr = btrfs_getattr,
.setattr = btrfs_setattr,
.permission = btrfs_permission,
.setxattr = btrfs_setxattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = btrfs_listxattr,
.removexattr = btrfs_removexattr,
.removexattr = generic_removexattr,
.update_time = btrfs_update_time,
};

22
fs/btrfs/xattr.c
View File

@ -237,6 +237,9 @@ int __btrfs_setxattr(struct btrfs_trans_handle *trans,
struct btrfs_root *root = BTRFS_I(inode)->root;
int ret;
if (btrfs_root_readonly(root))
return -EROFS;
if (trans)
return do_setxattr(trans, inode, name, value, size, flags);
@ -432,25 +435,6 @@ const struct xattr_handler *btrfs_xattr_handlers[] = {
NULL,
};
int btrfs_setxattr(struct dentry *dentry, const char *name, const void *value,
size_t size, int flags)
{
struct btrfs_root *root = BTRFS_I(d_inode(dentry))->root;
if (btrfs_root_readonly(root))
return -EROFS;
return generic_setxattr(dentry, name, value, size, flags);
}
int btrfs_removexattr(struct dentry *dentry, const char *name)
{
struct btrfs_root *root = BTRFS_I(d_inode(dentry))->root;
if (btrfs_root_readonly(root))
return -EROFS;
return generic_removexattr(dentry, name);
}
static int btrfs_initxattrs(struct inode *inode,
const struct xattr *xattr_array, void *fs_info)
{

3
fs/btrfs/xattr.h
View File

@ -28,9 +28,6 @@ extern ssize_t __btrfs_getxattr(struct inode *inode, const char *name,
extern int __btrfs_setxattr(struct btrfs_trans_handle *trans,
struct inode *inode, const char *name,
const void *value, size_t size, int flags);
extern int btrfs_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags);
extern int btrfs_removexattr(struct dentry *dentry, const char *name);
extern int btrfs_xattr_security_init(struct btrfs_trans_handle *trans,
struct inode *inode, struct inode *dir,