From e5fd91f1ef340da553f7a79da9540c3db711c937 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Tue, 8 Sep 2015 01:01:14 -0300 Subject: Linux-libre 4.2-gnu --- fs/aufs/xattr.c | 344 -------------------------------------------------------- 1 file changed, 344 deletions(-) delete mode 100644 fs/aufs/xattr.c (limited to 'fs/aufs/xattr.c') diff --git a/fs/aufs/xattr.c b/fs/aufs/xattr.c deleted file mode 100644 index b7e13ca3e..000000000 --- a/fs/aufs/xattr.c +++ /dev/null @@ -1,344 +0,0 @@ -/* - * Copyright (C) 2014-2015 Junjiro R. Okajima - * - * This program, aufs 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, see . - */ - -/* - * handling xattr functions - */ - -#include -#include "aufs.h" - -static int au_xattr_ignore(int err, char *name, unsigned int ignore_flags) -{ - if (!ignore_flags) - goto out; - switch (err) { - case -ENOMEM: - case -EDQUOT: - goto out; - } - - if ((ignore_flags & AuBrAttr_ICEX) == AuBrAttr_ICEX) { - err = 0; - goto out; - } - -#define cmp(brattr, prefix) do { \ - if (!strncmp(name, XATTR_##prefix##_PREFIX, \ - XATTR_##prefix##_PREFIX_LEN)) { \ - if (ignore_flags & AuBrAttr_ICEX_##brattr) \ - err = 0; \ - goto out; \ - } \ - } while (0) - - cmp(SEC, SECURITY); - cmp(SYS, SYSTEM); - cmp(TR, TRUSTED); - cmp(USR, USER); -#undef cmp - - if (ignore_flags & AuBrAttr_ICEX_OTH) - err = 0; - -out: - return err; -} - -static const int au_xattr_out_of_list = AuBrAttr_ICEX_OTH << 1; - -static int au_do_cpup_xattr(struct dentry *h_dst, struct dentry *h_src, - char *name, char **buf, unsigned int ignore_flags, - unsigned int verbose) -{ - int err; - ssize_t ssz; - struct inode *h_idst; - - ssz = vfs_getxattr_alloc(h_src, name, buf, 0, GFP_NOFS); - err = ssz; - if (unlikely(err <= 0)) { - if (err == -ENODATA - || (err == -EOPNOTSUPP - && ((ignore_flags & au_xattr_out_of_list) - || (au_test_nfs_noacl(d_inode(h_src)) - && (!strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS) - || !strcmp(name, - XATTR_NAME_POSIX_ACL_DEFAULT)))) - )) - err = 0; - if (err && (verbose || au_debug_test())) - pr_err("%s, err %d\n", name, err); - goto out; - } - - /* unlock it temporary */ - h_idst = d_inode(h_dst); - mutex_unlock(&h_idst->i_mutex); - err = vfsub_setxattr(h_dst, name, *buf, ssz, /*flags*/0); - mutex_lock_nested(&h_idst->i_mutex, AuLsc_I_CHILD2); - if (unlikely(err)) { - if (verbose || au_debug_test()) - pr_err("%s, err %d\n", name, err); - err = au_xattr_ignore(err, name, ignore_flags); - } - -out: - return err; -} - -int au_cpup_xattr(struct dentry *h_dst, struct dentry *h_src, int ignore_flags, - unsigned int verbose) -{ - int err, unlocked, acl_access, acl_default; - ssize_t ssz; - struct inode *h_isrc, *h_idst; - char *value, *p, *o, *e; - - /* try stopping to update the source inode while we are referencing */ - /* there should not be the parent-child relationship between them */ - h_isrc = d_inode(h_src); - h_idst = d_inode(h_dst); - mutex_unlock(&h_idst->i_mutex); - mutex_lock_nested(&h_isrc->i_mutex, AuLsc_I_CHILD); - mutex_lock_nested(&h_idst->i_mutex, AuLsc_I_CHILD2); - unlocked = 0; - - /* some filesystems don't list POSIX ACL, for example tmpfs */ - ssz = vfs_listxattr(h_src, NULL, 0); - err = ssz; - if (unlikely(err < 0)) { - AuTraceErr(err); - if (err == -ENODATA - || err == -EOPNOTSUPP) - err = 0; /* ignore */ - goto out; - } - - err = 0; - p = NULL; - o = NULL; - if (ssz) { - err = -ENOMEM; - p = kmalloc(ssz, GFP_NOFS); - o = p; - if (unlikely(!p)) - goto out; - err = vfs_listxattr(h_src, p, ssz); - } - mutex_unlock(&h_isrc->i_mutex); - unlocked = 1; - AuDbg("err %d, ssz %zd\n", err, ssz); - if (unlikely(err < 0)) - goto out_free; - - err = 0; - e = p + ssz; - value = NULL; - acl_access = 0; - acl_default = 0; - while (!err && p < e) { - acl_access |= !strncmp(p, XATTR_NAME_POSIX_ACL_ACCESS, - sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1); - acl_default |= !strncmp(p, XATTR_NAME_POSIX_ACL_DEFAULT, - sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - - 1); - err = au_do_cpup_xattr(h_dst, h_src, p, &value, ignore_flags, - verbose); - p += strlen(p) + 1; - } - AuTraceErr(err); - ignore_flags |= au_xattr_out_of_list; - if (!err && !acl_access) { - err = au_do_cpup_xattr(h_dst, h_src, - XATTR_NAME_POSIX_ACL_ACCESS, &value, - ignore_flags, verbose); - AuTraceErr(err); - } - if (!err && !acl_default) { - err = au_do_cpup_xattr(h_dst, h_src, - XATTR_NAME_POSIX_ACL_DEFAULT, &value, - ignore_flags, verbose); - AuTraceErr(err); - } - - kfree(value); - -out_free: - kfree(o); -out: - if (!unlocked) - mutex_unlock(&h_isrc->i_mutex); - AuTraceErr(err); - return err; -} - -/* ---------------------------------------------------------------------- */ - -enum { - AU_XATTR_LIST, - AU_XATTR_GET -}; - -struct au_lgxattr { - int type; - union { - struct { - char *list; - size_t size; - } list; - struct { - const char *name; - void *value; - size_t size; - } get; - } u; -}; - -static ssize_t au_lgxattr(struct dentry *dentry, struct au_lgxattr *arg) -{ - ssize_t err; - struct path h_path; - struct super_block *sb; - - sb = dentry->d_sb; - err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); - if (unlikely(err)) - goto out; - err = au_h_path_getattr(dentry, /*force*/1, &h_path); - if (unlikely(err)) - goto out_si; - if (unlikely(!h_path.dentry)) - /* illegally overlapped or something */ - goto out_di; /* pretending success */ - - /* always topmost entry only */ - switch (arg->type) { - case AU_XATTR_LIST: - err = vfs_listxattr(h_path.dentry, - arg->u.list.list, arg->u.list.size); - break; - case AU_XATTR_GET: - err = vfs_getxattr(h_path.dentry, - arg->u.get.name, arg->u.get.value, - arg->u.get.size); - break; - } - -out_di: - di_read_unlock(dentry, AuLock_IR); -out_si: - si_read_unlock(sb); -out: - AuTraceErr(err); - return err; -} - -ssize_t aufs_listxattr(struct dentry *dentry, char *list, size_t size) -{ - struct au_lgxattr arg = { - .type = AU_XATTR_LIST, - .u.list = { - .list = list, - .size = size - }, - }; - - return au_lgxattr(dentry, &arg); -} - -ssize_t aufs_getxattr(struct dentry *dentry, const char *name, void *value, - size_t size) -{ - struct au_lgxattr arg = { - .type = AU_XATTR_GET, - .u.get = { - .name = name, - .value = value, - .size = size - }, - }; - - return au_lgxattr(dentry, &arg); -} - -int aufs_setxattr(struct dentry *dentry, const char *name, const void *value, - size_t size, int flags) -{ - struct au_srxattr arg = { - .type = AU_XATTR_SET, - .u.set = { - .name = name, - .value = value, - .size = size, - .flags = flags - }, - }; - - return au_srxattr(dentry, &arg); -} - -int aufs_removexattr(struct dentry *dentry, const char *name) -{ - struct au_srxattr arg = { - .type = AU_XATTR_REMOVE, - .u.remove = { - .name = name - }, - }; - - return au_srxattr(dentry, &arg); -} - -/* ---------------------------------------------------------------------- */ - -#if 0 -static size_t au_xattr_list(struct dentry *dentry, char *list, size_t list_size, - const char *name, size_t name_len, int type) -{ - return aufs_listxattr(dentry, list, list_size); -} - -static int au_xattr_get(struct dentry *dentry, const char *name, void *buffer, - size_t size, int type) -{ - return aufs_getxattr(dentry, name, buffer, size); -} - -static int au_xattr_set(struct dentry *dentry, const char *name, - const void *value, size_t size, int flags, int type) -{ - return aufs_setxattr(dentry, name, value, size, flags); -} - -static const struct xattr_handler au_xattr_handler = { - /* no prefix, no flags */ - .list = au_xattr_list, - .get = au_xattr_get, - .set = au_xattr_set - /* why no remove? */ -}; - -static const struct xattr_handler *au_xattr_handlers[] = { - &au_xattr_handler -}; - -void au_xattr_init(struct super_block *sb) -{ - /* sb->s_xattr = au_xattr_handlers; */ -} -#endif -- cgit v1.2.3-54-g00ecf