diff options
Diffstat (limited to 'fs/jfs/acl.c')
| -rw-r--r-- | fs/jfs/acl.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/fs/jfs/acl.c b/fs/jfs/acl.c new file mode 100644 index 00000000..45559dc3 --- /dev/null +++ b/fs/jfs/acl.c @@ -0,0 +1,178 @@ +/* + * Copyright (C) International Business Machines Corp., 2002-2004 + * Copyright (C) Andreas Gruenbacher, 2001 + * Copyright (C) Linus Torvalds, 1991, 1992 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/fs.h> +#include <linux/posix_acl_xattr.h> +#include "jfs_incore.h" +#include "jfs_txnmgr.h" +#include "jfs_xattr.h" +#include "jfs_acl.h" + +struct posix_acl *jfs_get_acl(struct inode *inode, int type) +{ + struct posix_acl *acl; + char *ea_name; + int size; + char *value = NULL; + + acl = get_cached_acl(inode, type); + if (acl != ACL_NOT_CACHED) + return acl; + + switch(type) { + case ACL_TYPE_ACCESS: + ea_name = POSIX_ACL_XATTR_ACCESS; + break; + case ACL_TYPE_DEFAULT: + ea_name = POSIX_ACL_XATTR_DEFAULT; + break; + default: + return ERR_PTR(-EINVAL); + } + + size = __jfs_getxattr(inode, ea_name, NULL, 0); + + if (size > 0) { + value = kmalloc(size, GFP_KERNEL); + if (!value) + return ERR_PTR(-ENOMEM); + size = __jfs_getxattr(inode, ea_name, value, size); + } + + if (size < 0) { + if (size == -ENODATA) + acl = NULL; + else + acl = ERR_PTR(size); + } else { + acl = posix_acl_from_xattr(value, size); + } + kfree(value); + if (!IS_ERR(acl)) + set_cached_acl(inode, type, acl); + return acl; +} + +static int jfs_set_acl(tid_t tid, struct inode *inode, int type, + struct posix_acl *acl) +{ + char *ea_name; + int rc; + int size = 0; + char *value = NULL; + + if (S_ISLNK(inode->i_mode)) + return -EOPNOTSUPP; + + switch(type) { + case ACL_TYPE_ACCESS: + ea_name = POSIX_ACL_XATTR_ACCESS; + break; + case ACL_TYPE_DEFAULT: + ea_name = POSIX_ACL_XATTR_DEFAULT; + if (!S_ISDIR(inode->i_mode)) + return acl ? -EACCES : 0; + break; + default: + return -EINVAL; + } + if (acl) { + size = posix_acl_xattr_size(acl->a_count); + value = kmalloc(size, GFP_KERNEL); + if (!value) + return -ENOMEM; + rc = posix_acl_to_xattr(acl, value, size); + if (rc < 0) + goto out; + } + rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0); +out: + kfree(value); + + if (!rc) + set_cached_acl(inode, type, acl); + + return rc; +} + +int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir) +{ + struct posix_acl *acl = NULL; + int rc = 0; + + if (S_ISLNK(inode->i_mode)) + return 0; + + acl = jfs_get_acl(dir, ACL_TYPE_DEFAULT); + if (IS_ERR(acl)) + return PTR_ERR(acl); + + if (acl) { + if (S_ISDIR(inode->i_mode)) { + rc = jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, acl); + if (rc) + goto cleanup; + } + rc = posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode); + if (rc < 0) + goto cleanup; /* posix_acl_release(NULL) is no-op */ + if (rc > 0) + rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl); +cleanup: + posix_acl_release(acl); + } else + inode->i_mode &= ~current_umask(); + + JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) | + inode->i_mode; + + return rc; +} + +int jfs_acl_chmod(struct inode *inode) +{ + struct posix_acl *acl; + int rc; + tid_t tid; + + if (S_ISLNK(inode->i_mode)) + return -EOPNOTSUPP; + + acl = jfs_get_acl(inode, ACL_TYPE_ACCESS); + if (IS_ERR(acl) || !acl) + return PTR_ERR(acl); + + rc = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode); + if (rc) + return rc; + + tid = txBegin(inode->i_sb, 0); + mutex_lock(&JFS_IP(inode)->commit_mutex); + rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl); + if (!rc) + rc = txCommit(tid, 1, &inode, 0); + txEnd(tid); + mutex_unlock(&JFS_IP(inode)->commit_mutex); + + posix_acl_release(acl); + return rc; +} |