^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2007 Red Hat. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/rwsem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/xattr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/posix_acl_xattr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/iversion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/sched/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include "ctree.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include "btrfs_inode.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "transaction.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include "xattr.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include "disk-io.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include "props.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include "locking.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) int btrfs_getxattr(struct inode *inode, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) void *buffer, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct btrfs_dir_item *di;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct btrfs_path *path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct extent_buffer *leaf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) unsigned long data_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) path = btrfs_alloc_path();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) if (!path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) /* lookup the xattr by name */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) di = btrfs_lookup_xattr(NULL, root, path, btrfs_ino(BTRFS_I(inode)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) name, strlen(name), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (!di) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) ret = -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) } else if (IS_ERR(di)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) ret = PTR_ERR(di);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) leaf = path->nodes[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /* if size is 0, that means we want the size of the attr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (!size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) ret = btrfs_dir_data_len(leaf, di);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) /* now get the data out of our dir_item */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (btrfs_dir_data_len(leaf, di) > size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) ret = -ERANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * The way things are packed into the leaf is like this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * |struct btrfs_dir_item|name|data|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * where name is the xattr name, so security.foo, and data is the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * content of the xattr. data_ptr points to the location in memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * where the data starts in the in memory leaf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) data_ptr = (unsigned long)((char *)(di + 1) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) btrfs_dir_name_len(leaf, di));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) read_extent_buffer(leaf, buffer, data_ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) btrfs_dir_data_len(leaf, di));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) ret = btrfs_dir_data_len(leaf, di);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) btrfs_free_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) int btrfs_setxattr(struct btrfs_trans_handle *trans, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) const char *name, const void *value, size_t size, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) struct btrfs_dir_item *di = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) struct btrfs_fs_info *fs_info = root->fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct btrfs_path *path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) size_t name_len = strlen(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) ASSERT(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (name_len + size > BTRFS_MAX_XATTR_SIZE(root->fs_info))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) path = btrfs_alloc_path();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (!path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) path->skip_release_on_error = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (!value) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) di = btrfs_lookup_xattr(trans, root, path,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) btrfs_ino(BTRFS_I(inode)), name, name_len, -1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (!di && (flags & XATTR_REPLACE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) ret = -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) else if (IS_ERR(di))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) ret = PTR_ERR(di);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) else if (di)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) ret = btrfs_delete_one_dir_name(trans, root, path, di);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) * For a replace we can't just do the insert blindly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) * Do a lookup first (read-only btrfs_search_slot), and return if xattr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * doesn't exist. If it exists, fall down below to the insert/replace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) * path - we can't race with a concurrent xattr delete, because the VFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) * locks the inode's i_mutex before calling setxattr or removexattr.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (flags & XATTR_REPLACE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) ASSERT(inode_is_locked(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) di = btrfs_lookup_xattr(NULL, root, path,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) btrfs_ino(BTRFS_I(inode)), name, name_len, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (!di)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) ret = -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) else if (IS_ERR(di))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) ret = PTR_ERR(di);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) btrfs_release_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) di = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) ret = btrfs_insert_xattr_item(trans, root, path, btrfs_ino(BTRFS_I(inode)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) name, name_len, value, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) if (ret == -EOVERFLOW) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) * We have an existing item in a leaf, split_leaf couldn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) * expand it. That item might have or not a dir_item that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) * matches our target xattr, so lets check.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) btrfs_assert_tree_locked(path->nodes[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) di = btrfs_match_dir_item_name(fs_info, path, name, name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (!di && !(flags & XATTR_REPLACE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) ret = -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) } else if (ret == -EEXIST) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) di = btrfs_match_dir_item_name(fs_info, path, name, name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) ASSERT(di); /* logic error */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) } else if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if (di && (flags & XATTR_CREATE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) ret = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) if (di) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) * We're doing a replace, and it must be atomic, that is, at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) * any point in time we have either the old or the new xattr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * value in the tree. We don't want readers (getxattr and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * listxattrs) to miss a value, this is specially important
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * for ACLs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) const int slot = path->slots[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) struct extent_buffer *leaf = path->nodes[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) const u16 old_data_len = btrfs_dir_data_len(leaf, di);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) const u32 item_size = btrfs_item_size_nr(leaf, slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) const u32 data_size = sizeof(*di) + name_len + size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) struct btrfs_item *item;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) unsigned long data_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) char *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if (size > old_data_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) if (btrfs_leaf_free_space(leaf) <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) (size - old_data_len)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) ret = -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) if (old_data_len + name_len + sizeof(*di) == item_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) /* No other xattrs packed in the same leaf item. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (size > old_data_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) btrfs_extend_item(path, size - old_data_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) else if (size < old_data_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) btrfs_truncate_item(path, data_size, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) /* There are other xattrs packed in the same item. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) ret = btrfs_delete_one_dir_name(trans, root, path, di);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) btrfs_extend_item(path, data_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) item = btrfs_item_nr(slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) ptr = btrfs_item_ptr(leaf, slot, char);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) ptr += btrfs_item_size(leaf, item) - data_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) di = (struct btrfs_dir_item *)ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) btrfs_set_dir_data_len(leaf, di, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) data_ptr = ((unsigned long)(di + 1)) + name_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) write_extent_buffer(leaf, value, data_ptr, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) btrfs_mark_buffer_dirty(leaf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) * Insert, and we had space for the xattr, so path->slots[0] is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) * where our xattr dir_item is and btrfs_insert_xattr_item()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) * filled it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) btrfs_free_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) set_bit(BTRFS_INODE_COPY_EVERYTHING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) &BTRFS_I(inode)->runtime_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) clear_bit(BTRFS_INODE_NO_XATTRS, &BTRFS_I(inode)->runtime_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) * @value: "" makes the attribute to empty, NULL removes it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) int btrfs_setxattr_trans(struct inode *inode, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) const void *value, size_t size, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) struct btrfs_trans_handle *trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) const bool start_trans = (current->journal_info == NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) if (start_trans) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) * 1 unit for inserting/updating/deleting the xattr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) * 1 unit for the inode item update
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) trans = btrfs_start_transaction(root, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) if (IS_ERR(trans))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) return PTR_ERR(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) * This can happen when smack is enabled and a directory is being
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) * created. It happens through d_instantiate_new(), which calls
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) * smack_d_instantiate(), which in turn calls __vfs_setxattr() to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) * set the transmute xattr (XATTR_NAME_SMACKTRANSMUTE) on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) * inode. We have already reserved space for the xattr and inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) * update at btrfs_mkdir(), so just use the transaction handle.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * We don't join or start a transaction, as that will reset the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * block_rsv of the handle and trigger a warning for the start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) * case.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) ASSERT(strncmp(name, XATTR_SECURITY_PREFIX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) XATTR_SECURITY_PREFIX_LEN) == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) trans = current->journal_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) ret = btrfs_setxattr(trans, inode, name, value, size, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) inode_inc_iversion(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) inode->i_ctime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) ret = btrfs_update_inode(trans, root, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) BUG_ON(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) if (start_trans)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) btrfs_end_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) struct btrfs_key key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) struct inode *inode = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) struct btrfs_path *path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) size_t total_size = 0, size_left = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) * ok we want all objects associated with this id.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) * NOTE: we set key.offset = 0; because we want to start with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) * first xattr that we find and walk forward
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) key.objectid = btrfs_ino(BTRFS_I(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) key.type = BTRFS_XATTR_ITEM_KEY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) key.offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) path = btrfs_alloc_path();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) if (!path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) path->reada = READA_FORWARD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) /* search for our xattrs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) struct extent_buffer *leaf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) int slot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) struct btrfs_dir_item *di;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) struct btrfs_key found_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) u32 item_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) u32 cur;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) leaf = path->nodes[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) slot = path->slots[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) /* this is where we start walking through the path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) if (slot >= btrfs_header_nritems(leaf)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) * if we've reached the last slot in this leaf we need
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) * to go to the next leaf and reset everything
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) ret = btrfs_next_leaf(root, path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) else if (ret > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) btrfs_item_key_to_cpu(leaf, &found_key, slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) /* check to make sure this item is what we want */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) if (found_key.objectid != key.objectid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) if (found_key.type > BTRFS_XATTR_ITEM_KEY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) if (found_key.type < BTRFS_XATTR_ITEM_KEY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) goto next_item;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) item_size = btrfs_item_size_nr(leaf, slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) cur = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) while (cur < item_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) u16 name_len = btrfs_dir_name_len(leaf, di);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) u16 data_len = btrfs_dir_data_len(leaf, di);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) u32 this_len = sizeof(*di) + name_len + data_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) unsigned long name_ptr = (unsigned long)(di + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) total_size += name_len + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) * We are just looking for how big our buffer needs to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) * be.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) if (!size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) goto next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) if (!buffer || (name_len + 1) > size_left) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) ret = -ERANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) read_extent_buffer(leaf, buffer, name_ptr, name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) buffer[name_len] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) size_left -= name_len + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) buffer += name_len + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) next:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) cur += this_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) di = (struct btrfs_dir_item *)((char *)di + this_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) next_item:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) path->slots[0]++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) ret = total_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) btrfs_free_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) static int btrfs_xattr_handler_get(const struct xattr_handler *handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) struct dentry *unused, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) const char *name, void *buffer, size_t size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) name = xattr_full_name(handler, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) return btrfs_getxattr(inode, name, buffer, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) static int btrfs_xattr_handler_set(const struct xattr_handler *handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) struct dentry *unused, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) const char *name, const void *buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) size_t size, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) name = xattr_full_name(handler, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) return btrfs_setxattr_trans(inode, name, buffer, size, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) static int btrfs_xattr_handler_set_prop(const struct xattr_handler *handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) struct dentry *unused, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) const char *name, const void *value,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) size_t size, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) struct btrfs_trans_handle *trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) name = xattr_full_name(handler, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) ret = btrfs_validate_prop(name, value, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) trans = btrfs_start_transaction(root, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) if (IS_ERR(trans))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) return PTR_ERR(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) ret = btrfs_set_prop(trans, inode, name, value, size, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) inode_inc_iversion(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) inode->i_ctime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) ret = btrfs_update_inode(trans, root, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) BUG_ON(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) btrfs_end_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) static const struct xattr_handler btrfs_security_xattr_handler = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) .prefix = XATTR_SECURITY_PREFIX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) .get = btrfs_xattr_handler_get,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) .set = btrfs_xattr_handler_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) static const struct xattr_handler btrfs_trusted_xattr_handler = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) .prefix = XATTR_TRUSTED_PREFIX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) .get = btrfs_xattr_handler_get,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) .set = btrfs_xattr_handler_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) static const struct xattr_handler btrfs_user_xattr_handler = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) .prefix = XATTR_USER_PREFIX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) .get = btrfs_xattr_handler_get,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) .set = btrfs_xattr_handler_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) static const struct xattr_handler btrfs_btrfs_xattr_handler = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) .prefix = XATTR_BTRFS_PREFIX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) .get = btrfs_xattr_handler_get,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) .set = btrfs_xattr_handler_set_prop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) const struct xattr_handler *btrfs_xattr_handlers[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) &btrfs_security_xattr_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) #ifdef CONFIG_BTRFS_FS_POSIX_ACL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) &posix_acl_access_xattr_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) &posix_acl_default_xattr_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) &btrfs_trusted_xattr_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) &btrfs_user_xattr_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) &btrfs_btrfs_xattr_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) static int btrfs_initxattrs(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) const struct xattr *xattr_array, void *fs_private)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) struct btrfs_trans_handle *trans = fs_private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) const struct xattr *xattr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) unsigned int nofs_flag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) * We're holding a transaction handle, so use a NOFS memory allocation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) * context to avoid deadlock if reclaim happens.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) nofs_flag = memalloc_nofs_save();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) for (xattr = xattr_array; xattr->name != NULL; xattr++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) name = kmalloc(XATTR_SECURITY_PREFIX_LEN +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) strlen(xattr->name) + 1, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) if (!name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) strcpy(name, XATTR_SECURITY_PREFIX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) strcpy(name + XATTR_SECURITY_PREFIX_LEN, xattr->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) err = btrfs_setxattr(trans, inode, name, xattr->value,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) xattr->value_len, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) kfree(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) memalloc_nofs_restore(nofs_flag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) int btrfs_xattr_security_init(struct btrfs_trans_handle *trans,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) struct inode *inode, struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) const struct qstr *qstr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) return security_inode_init_security(inode, dir, qstr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) &btrfs_initxattrs, trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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