Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 | // SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. */ #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/posix_acl.h> #include <linux/posix_acl_xattr.h> #include <linux/gfs2_ondisk.h> #include "gfs2.h" #include "incore.h" #include "acl.h" #include "xattr.h" #include "glock.h" #include "inode.h" #include "meta_io.h" #include "quota.h" #include "rgrp.h" #include "trans.h" #include "util.h" static const char *gfs2_acl_name(int type) { switch (type) { case ACL_TYPE_ACCESS: return XATTR_POSIX_ACL_ACCESS; case ACL_TYPE_DEFAULT: return XATTR_POSIX_ACL_DEFAULT; } return NULL; } static struct posix_acl *__gfs2_get_acl(struct inode *inode, int type) { struct gfs2_inode *ip = GFS2_I(inode); struct posix_acl *acl; const char *name; char *data; int len; if (!ip->i_eattr) return NULL; name = gfs2_acl_name(type); len = gfs2_xattr_acl_get(ip, name, &data); if (len <= 0) return ERR_PTR(len); acl = posix_acl_from_xattr(&init_user_ns, data, len); kfree(data); return acl; } struct posix_acl *gfs2_get_acl(struct inode *inode, int type, bool rcu) { struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_holder gh; bool need_unlock = false; struct posix_acl *acl; if (rcu) return ERR_PTR(-ECHILD); if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { int ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); if (ret) return ERR_PTR(ret); need_unlock = true; } acl = __gfs2_get_acl(inode, type); if (need_unlock) gfs2_glock_dq_uninit(&gh); return acl; } int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type) { int error; size_t len; char *data; const char *name = gfs2_acl_name(type); if (acl) { len = posix_acl_xattr_size(acl->a_count); data = kmalloc(len, GFP_NOFS); if (data == NULL) return -ENOMEM; error = posix_acl_to_xattr(&init_user_ns, acl, data, len); if (error < 0) goto out; } else { data = NULL; len = 0; } error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS); if (error) goto out; set_cached_acl(inode, type, acl); out: kfree(data); return error; } int gfs2_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, struct posix_acl *acl, int type) { struct inode *inode = d_inode(dentry); struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_holder gh; bool need_unlock = false; int ret; umode_t mode; if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode))) return -E2BIG; ret = gfs2_qa_get(ip); if (ret) return ret; if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); if (ret) goto out; need_unlock = true; } mode = inode->i_mode; if (type == ACL_TYPE_ACCESS && acl) { ret = posix_acl_update_mode(&nop_mnt_idmap, inode, &mode, &acl); if (ret) goto unlock; } ret = __gfs2_set_acl(inode, acl, type); if (!ret && mode != inode->i_mode) { inode->i_ctime = current_time(inode); inode->i_mode = mode; mark_inode_dirty(inode); } unlock: if (need_unlock) gfs2_glock_dq_uninit(&gh); out: gfs2_qa_put(ip); return ret; } |