| /* |
| * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
| * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. |
| * |
| * This copyrighted material is made available to anyone wishing to use, |
| * modify, copy, or redistribute it subject to the terms and conditions |
| * of the GNU General Public License v.2. |
| */ |
| |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/completion.h> |
| #include <linux/buffer_head.h> |
| #include <linux/xattr.h> |
| #include <linux/gfs2_ondisk.h> |
| #include <asm/semaphore.h> |
| #include <asm/uaccess.h> |
| |
| #include "gfs2.h" |
| #include "lm_interface.h" |
| #include "incore.h" |
| #include "acl.h" |
| #include "eaops.h" |
| #include "eattr.h" |
| #include "util.h" |
| |
| /** |
| * gfs2_ea_name2type - get the type of the ea, and truncate type from the name |
| * @namep: ea name, possibly with type appended |
| * |
| * Returns: GFS2_EATYPE_XXX |
| */ |
| |
| unsigned int gfs2_ea_name2type(const char *name, char **truncated_name) |
| { |
| unsigned int type; |
| |
| if (strncmp(name, "system.", 7) == 0) { |
| type = GFS2_EATYPE_SYS; |
| if (truncated_name) |
| *truncated_name = strchr(name, '.') + 1; |
| } else if (strncmp(name, "user.", 5) == 0) { |
| type = GFS2_EATYPE_USR; |
| if (truncated_name) |
| *truncated_name = strchr(name, '.') + 1; |
| } else { |
| type = GFS2_EATYPE_UNUSED; |
| if (truncated_name) |
| *truncated_name = NULL; |
| } |
| |
| return type; |
| } |
| |
| static int user_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er) |
| { |
| struct inode *inode = ip->i_vnode; |
| int error = permission(inode, MAY_READ, NULL); |
| if (error) |
| return error; |
| |
| return gfs2_ea_get_i(ip, er); |
| } |
| |
| static int user_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er) |
| { |
| struct inode *inode = ip->i_vnode; |
| |
| if (S_ISREG(inode->i_mode) || |
| (S_ISDIR(inode->i_mode) && !(inode->i_mode & S_ISVTX))) { |
| int error = permission(inode, MAY_WRITE, NULL); |
| if (error) |
| return error; |
| } else |
| return -EPERM; |
| |
| return gfs2_ea_set_i(ip, er); |
| } |
| |
| static int user_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er) |
| { |
| struct inode *inode = ip->i_vnode; |
| |
| if (S_ISREG(inode->i_mode) || |
| (S_ISDIR(inode->i_mode) && !(inode->i_mode & S_ISVTX))) { |
| int error = permission(inode, MAY_WRITE, NULL); |
| if (error) |
| return error; |
| } else |
| return -EPERM; |
| |
| return gfs2_ea_remove_i(ip, er); |
| } |
| |
| static int system_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er) |
| { |
| if (!GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) && |
| !GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len) && |
| !capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| if (ip->i_sbd->sd_args.ar_posix_acl == 0 && |
| (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) || |
| GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len))) |
| return -EOPNOTSUPP; |
| |
| |
| |
| return gfs2_ea_get_i(ip, er); |
| } |
| |
| static int system_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er) |
| { |
| int remove = 0; |
| int error; |
| |
| if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) { |
| if (!(er->er_flags & GFS2_ERF_MODE)) { |
| er->er_mode = ip->i_di.di_mode; |
| er->er_flags |= GFS2_ERF_MODE; |
| } |
| error = gfs2_acl_validate_set(ip, 1, er, |
| &remove, &er->er_mode); |
| if (error) |
| return error; |
| error = gfs2_ea_set_i(ip, er); |
| if (error) |
| return error; |
| if (remove) |
| gfs2_ea_remove_i(ip, er); |
| return 0; |
| |
| } else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) { |
| error = gfs2_acl_validate_set(ip, 0, er, |
| &remove, NULL); |
| if (error) |
| return error; |
| if (!remove) |
| error = gfs2_ea_set_i(ip, er); |
| else { |
| error = gfs2_ea_remove_i(ip, er); |
| if (error == -ENODATA) |
| error = 0; |
| } |
| return error; |
| } |
| |
| return -EPERM; |
| } |
| |
| static int system_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er) |
| { |
| if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) { |
| int error = gfs2_acl_validate_remove(ip, 1); |
| if (error) |
| return error; |
| |
| } else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) { |
| int error = gfs2_acl_validate_remove(ip, 0); |
| if (error) |
| return error; |
| |
| } else |
| return -EPERM; |
| |
| return gfs2_ea_remove_i(ip, er); |
| } |
| |
| static struct gfs2_eattr_operations gfs2_user_eaops = { |
| .eo_get = user_eo_get, |
| .eo_set = user_eo_set, |
| .eo_remove = user_eo_remove, |
| .eo_name = "user", |
| }; |
| |
| struct gfs2_eattr_operations gfs2_system_eaops = { |
| .eo_get = system_eo_get, |
| .eo_set = system_eo_set, |
| .eo_remove = system_eo_remove, |
| .eo_name = "system", |
| }; |
| |
| struct gfs2_eattr_operations *gfs2_ea_ops[] = { |
| NULL, |
| &gfs2_user_eaops, |
| &gfs2_system_eaops, |
| }; |
| |