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7e23c1746b
Avoid the private error code return to caller. The error code should be transformed into genernal error code. Signed-off-by: Hongbo Li <lihongbo22@huawei.com> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
656 lines
16 KiB
C
656 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "bcachefs.h"
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#include "acl.h"
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#include "bkey_methods.h"
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#include "btree_update.h"
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#include "extents.h"
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#include "fs.h"
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#include "rebalance.h"
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#include "str_hash.h"
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#include "xattr.h"
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#include <linux/dcache.h>
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#include <linux/posix_acl_xattr.h>
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#include <linux/xattr.h>
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static const struct xattr_handler *bch2_xattr_type_to_handler(unsigned);
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static u64 bch2_xattr_hash(const struct bch_hash_info *info,
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const struct xattr_search_key *key)
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{
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struct bch_str_hash_ctx ctx;
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bch2_str_hash_init(&ctx, info);
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bch2_str_hash_update(&ctx, info, &key->type, sizeof(key->type));
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bch2_str_hash_update(&ctx, info, key->name.name, key->name.len);
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return bch2_str_hash_end(&ctx, info);
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}
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static u64 xattr_hash_key(const struct bch_hash_info *info, const void *key)
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{
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return bch2_xattr_hash(info, key);
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}
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static u64 xattr_hash_bkey(const struct bch_hash_info *info, struct bkey_s_c k)
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{
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struct bkey_s_c_xattr x = bkey_s_c_to_xattr(k);
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return bch2_xattr_hash(info,
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&X_SEARCH(x.v->x_type, x.v->x_name, x.v->x_name_len));
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}
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static bool xattr_cmp_key(struct bkey_s_c _l, const void *_r)
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{
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struct bkey_s_c_xattr l = bkey_s_c_to_xattr(_l);
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const struct xattr_search_key *r = _r;
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return l.v->x_type != r->type ||
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l.v->x_name_len != r->name.len ||
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memcmp(l.v->x_name, r->name.name, r->name.len);
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}
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static bool xattr_cmp_bkey(struct bkey_s_c _l, struct bkey_s_c _r)
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{
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struct bkey_s_c_xattr l = bkey_s_c_to_xattr(_l);
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struct bkey_s_c_xattr r = bkey_s_c_to_xattr(_r);
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return l.v->x_type != r.v->x_type ||
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l.v->x_name_len != r.v->x_name_len ||
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memcmp(l.v->x_name, r.v->x_name, r.v->x_name_len);
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}
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const struct bch_hash_desc bch2_xattr_hash_desc = {
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.btree_id = BTREE_ID_xattrs,
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.key_type = KEY_TYPE_xattr,
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.hash_key = xattr_hash_key,
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.hash_bkey = xattr_hash_bkey,
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.cmp_key = xattr_cmp_key,
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.cmp_bkey = xattr_cmp_bkey,
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};
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int bch2_xattr_invalid(struct bch_fs *c, struct bkey_s_c k,
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enum bkey_invalid_flags flags,
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struct printbuf *err)
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{
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struct bkey_s_c_xattr xattr = bkey_s_c_to_xattr(k);
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unsigned val_u64s = xattr_val_u64s(xattr.v->x_name_len,
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le16_to_cpu(xattr.v->x_val_len));
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int ret = 0;
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bkey_fsck_err_on(bkey_val_u64s(k.k) < val_u64s, c, err,
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xattr_val_size_too_small,
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"value too small (%zu < %u)",
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bkey_val_u64s(k.k), val_u64s);
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/* XXX why +4 ? */
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val_u64s = xattr_val_u64s(xattr.v->x_name_len,
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le16_to_cpu(xattr.v->x_val_len) + 4);
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bkey_fsck_err_on(bkey_val_u64s(k.k) > val_u64s, c, err,
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xattr_val_size_too_big,
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"value too big (%zu > %u)",
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bkey_val_u64s(k.k), val_u64s);
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bkey_fsck_err_on(!bch2_xattr_type_to_handler(xattr.v->x_type), c, err,
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xattr_invalid_type,
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"invalid type (%u)", xattr.v->x_type);
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bkey_fsck_err_on(memchr(xattr.v->x_name, '\0', xattr.v->x_name_len), c, err,
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xattr_name_invalid_chars,
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"xattr name has invalid characters");
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fsck_err:
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return ret;
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}
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void bch2_xattr_to_text(struct printbuf *out, struct bch_fs *c,
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struct bkey_s_c k)
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{
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const struct xattr_handler *handler;
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struct bkey_s_c_xattr xattr = bkey_s_c_to_xattr(k);
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handler = bch2_xattr_type_to_handler(xattr.v->x_type);
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if (handler && handler->prefix)
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prt_printf(out, "%s", handler->prefix);
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else if (handler)
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prt_printf(out, "(type %u)", xattr.v->x_type);
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else
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prt_printf(out, "(unknown type %u)", xattr.v->x_type);
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prt_printf(out, "%.*s:%.*s",
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xattr.v->x_name_len,
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xattr.v->x_name,
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le16_to_cpu(xattr.v->x_val_len),
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(char *) xattr_val(xattr.v));
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if (xattr.v->x_type == KEY_TYPE_XATTR_INDEX_POSIX_ACL_ACCESS ||
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xattr.v->x_type == KEY_TYPE_XATTR_INDEX_POSIX_ACL_DEFAULT) {
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prt_char(out, ' ');
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bch2_acl_to_text(out, xattr_val(xattr.v),
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le16_to_cpu(xattr.v->x_val_len));
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}
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}
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static int bch2_xattr_get_trans(struct btree_trans *trans, struct bch_inode_info *inode,
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const char *name, void *buffer, size_t size, int type)
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{
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struct bch_hash_info hash = bch2_hash_info_init(trans->c, &inode->ei_inode);
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struct xattr_search_key search = X_SEARCH(type, name, strlen(name));
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struct btree_iter iter;
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struct bkey_s_c_xattr xattr;
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struct bkey_s_c k;
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int ret;
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ret = bch2_hash_lookup(trans, &iter, bch2_xattr_hash_desc, &hash,
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inode_inum(inode), &search, 0);
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if (ret)
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goto err1;
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k = bch2_btree_iter_peek_slot(&iter);
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ret = bkey_err(k);
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if (ret)
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goto err2;
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xattr = bkey_s_c_to_xattr(k);
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ret = le16_to_cpu(xattr.v->x_val_len);
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if (buffer) {
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if (ret > size)
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ret = -ERANGE;
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else
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memcpy(buffer, xattr_val(xattr.v), ret);
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}
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err2:
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bch2_trans_iter_exit(trans, &iter);
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err1:
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return ret < 0 && bch2_err_matches(ret, ENOENT) ? -ENODATA : ret;
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}
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int bch2_xattr_set(struct btree_trans *trans, subvol_inum inum,
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struct bch_inode_unpacked *inode_u,
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const struct bch_hash_info *hash_info,
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const char *name, const void *value, size_t size,
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int type, int flags)
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{
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struct bch_fs *c = trans->c;
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struct btree_iter inode_iter = { NULL };
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int ret;
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ret = bch2_subvol_is_ro_trans(trans, inum.subvol) ?:
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bch2_inode_peek(trans, &inode_iter, inode_u, inum, BTREE_ITER_INTENT);
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if (ret)
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return ret;
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inode_u->bi_ctime = bch2_current_time(c);
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ret = bch2_inode_write(trans, &inode_iter, inode_u);
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bch2_trans_iter_exit(trans, &inode_iter);
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if (ret)
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return ret;
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if (value) {
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struct bkey_i_xattr *xattr;
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unsigned namelen = strlen(name);
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unsigned u64s = BKEY_U64s +
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xattr_val_u64s(namelen, size);
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if (u64s > U8_MAX)
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return -ERANGE;
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xattr = bch2_trans_kmalloc(trans, u64s * sizeof(u64));
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if (IS_ERR(xattr))
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return PTR_ERR(xattr);
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bkey_xattr_init(&xattr->k_i);
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xattr->k.u64s = u64s;
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xattr->v.x_type = type;
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xattr->v.x_name_len = namelen;
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xattr->v.x_val_len = cpu_to_le16(size);
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memcpy(xattr->v.x_name, name, namelen);
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memcpy(xattr_val(&xattr->v), value, size);
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ret = bch2_hash_set(trans, bch2_xattr_hash_desc, hash_info,
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inum, &xattr->k_i,
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(flags & XATTR_CREATE ? BCH_HASH_SET_MUST_CREATE : 0)|
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(flags & XATTR_REPLACE ? BCH_HASH_SET_MUST_REPLACE : 0));
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} else {
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struct xattr_search_key search =
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X_SEARCH(type, name, strlen(name));
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ret = bch2_hash_delete(trans, bch2_xattr_hash_desc,
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hash_info, inum, &search);
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}
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if (bch2_err_matches(ret, ENOENT))
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ret = flags & XATTR_REPLACE ? -ENODATA : 0;
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return ret;
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}
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struct xattr_buf {
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char *buf;
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size_t len;
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size_t used;
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};
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static int __bch2_xattr_emit(const char *prefix,
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const char *name, size_t name_len,
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struct xattr_buf *buf)
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{
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const size_t prefix_len = strlen(prefix);
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const size_t total_len = prefix_len + name_len + 1;
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if (buf->buf) {
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if (buf->used + total_len > buf->len)
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return -ERANGE;
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memcpy(buf->buf + buf->used, prefix, prefix_len);
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memcpy(buf->buf + buf->used + prefix_len,
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name, name_len);
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buf->buf[buf->used + prefix_len + name_len] = '\0';
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}
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buf->used += total_len;
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return 0;
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}
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static int bch2_xattr_emit(struct dentry *dentry,
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const struct bch_xattr *xattr,
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struct xattr_buf *buf)
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{
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const struct xattr_handler *handler =
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bch2_xattr_type_to_handler(xattr->x_type);
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return handler && (!handler->list || handler->list(dentry))
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? __bch2_xattr_emit(handler->prefix ?: handler->name,
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xattr->x_name, xattr->x_name_len, buf)
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: 0;
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}
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static int bch2_xattr_list_bcachefs(struct bch_fs *c,
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struct bch_inode_unpacked *inode,
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struct xattr_buf *buf,
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bool all)
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{
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const char *prefix = all ? "bcachefs_effective." : "bcachefs.";
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unsigned id;
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int ret = 0;
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u64 v;
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for (id = 0; id < Inode_opt_nr; id++) {
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v = bch2_inode_opt_get(inode, id);
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if (!v)
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continue;
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if (!all &&
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!(inode->bi_fields_set & (1 << id)))
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continue;
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ret = __bch2_xattr_emit(prefix, bch2_inode_opts[id],
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strlen(bch2_inode_opts[id]), buf);
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if (ret)
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break;
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}
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return ret;
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}
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ssize_t bch2_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size)
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{
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struct bch_fs *c = dentry->d_sb->s_fs_info;
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struct bch_inode_info *inode = to_bch_ei(dentry->d_inode);
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struct btree_trans *trans = bch2_trans_get(c);
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struct btree_iter iter;
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struct bkey_s_c k;
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struct xattr_buf buf = { .buf = buffer, .len = buffer_size };
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u64 offset = 0, inum = inode->ei_inode.bi_inum;
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u32 snapshot;
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int ret;
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retry:
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bch2_trans_begin(trans);
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iter = (struct btree_iter) { NULL };
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ret = bch2_subvolume_get_snapshot(trans, inode->ei_subvol, &snapshot);
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if (ret)
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goto err;
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for_each_btree_key_upto_norestart(trans, iter, BTREE_ID_xattrs,
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SPOS(inum, offset, snapshot),
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POS(inum, U64_MAX), 0, k, ret) {
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if (k.k->type != KEY_TYPE_xattr)
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continue;
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ret = bch2_xattr_emit(dentry, bkey_s_c_to_xattr(k).v, &buf);
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if (ret)
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break;
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}
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offset = iter.pos.offset;
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bch2_trans_iter_exit(trans, &iter);
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err:
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if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
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goto retry;
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bch2_trans_put(trans);
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if (ret)
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goto out;
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ret = bch2_xattr_list_bcachefs(c, &inode->ei_inode, &buf, false);
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if (ret)
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goto out;
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ret = bch2_xattr_list_bcachefs(c, &inode->ei_inode, &buf, true);
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if (ret)
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goto out;
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return buf.used;
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out:
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return bch2_err_class(ret);
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}
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static int bch2_xattr_get_handler(const struct xattr_handler *handler,
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struct dentry *dentry, struct inode *vinode,
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const char *name, void *buffer, size_t size)
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{
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struct bch_inode_info *inode = to_bch_ei(vinode);
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struct bch_fs *c = inode->v.i_sb->s_fs_info;
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int ret = bch2_trans_do(c, NULL, NULL, 0,
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bch2_xattr_get_trans(trans, inode, name, buffer, size, handler->flags));
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return bch2_err_class(ret);
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}
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static int bch2_xattr_set_handler(const struct xattr_handler *handler,
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struct mnt_idmap *idmap,
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struct dentry *dentry, struct inode *vinode,
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const char *name, const void *value,
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size_t size, int flags)
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{
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struct bch_inode_info *inode = to_bch_ei(vinode);
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struct bch_fs *c = inode->v.i_sb->s_fs_info;
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struct bch_hash_info hash = bch2_hash_info_init(c, &inode->ei_inode);
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struct bch_inode_unpacked inode_u;
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int ret;
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ret = bch2_trans_run(c,
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commit_do(trans, NULL, NULL, 0,
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bch2_xattr_set(trans, inode_inum(inode), &inode_u,
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&hash, name, value, size,
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handler->flags, flags)) ?:
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(bch2_inode_update_after_write(trans, inode, &inode_u, ATTR_CTIME), 0));
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return bch2_err_class(ret);
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}
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static const struct xattr_handler bch_xattr_user_handler = {
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.prefix = XATTR_USER_PREFIX,
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.get = bch2_xattr_get_handler,
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.set = bch2_xattr_set_handler,
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.flags = KEY_TYPE_XATTR_INDEX_USER,
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};
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static bool bch2_xattr_trusted_list(struct dentry *dentry)
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{
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return capable(CAP_SYS_ADMIN);
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}
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static const struct xattr_handler bch_xattr_trusted_handler = {
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.prefix = XATTR_TRUSTED_PREFIX,
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.list = bch2_xattr_trusted_list,
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.get = bch2_xattr_get_handler,
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.set = bch2_xattr_set_handler,
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.flags = KEY_TYPE_XATTR_INDEX_TRUSTED,
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};
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static const struct xattr_handler bch_xattr_security_handler = {
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.prefix = XATTR_SECURITY_PREFIX,
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.get = bch2_xattr_get_handler,
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.set = bch2_xattr_set_handler,
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.flags = KEY_TYPE_XATTR_INDEX_SECURITY,
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};
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#ifndef NO_BCACHEFS_FS
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static int opt_to_inode_opt(int id)
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{
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switch (id) {
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#define x(name, ...) \
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case Opt_##name: return Inode_opt_##name;
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BCH_INODE_OPTS()
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#undef x
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default:
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return -1;
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}
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}
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static int __bch2_xattr_bcachefs_get(const struct xattr_handler *handler,
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struct dentry *dentry, struct inode *vinode,
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const char *name, void *buffer, size_t size,
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bool all)
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{
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struct bch_inode_info *inode = to_bch_ei(vinode);
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struct bch_fs *c = inode->v.i_sb->s_fs_info;
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struct bch_opts opts =
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bch2_inode_opts_to_opts(&inode->ei_inode);
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const struct bch_option *opt;
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int id, inode_opt_id;
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struct printbuf out = PRINTBUF;
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int ret;
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u64 v;
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id = bch2_opt_lookup(name);
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if (id < 0 || !bch2_opt_is_inode_opt(id))
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return -EINVAL;
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inode_opt_id = opt_to_inode_opt(id);
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if (inode_opt_id < 0)
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return -EINVAL;
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opt = bch2_opt_table + id;
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if (!bch2_opt_defined_by_id(&opts, id))
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return -ENODATA;
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if (!all &&
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!(inode->ei_inode.bi_fields_set & (1 << inode_opt_id)))
|
|
return -ENODATA;
|
|
|
|
v = bch2_opt_get_by_id(&opts, id);
|
|
bch2_opt_to_text(&out, c, c->disk_sb.sb, opt, v, 0);
|
|
|
|
ret = out.pos;
|
|
|
|
if (out.allocation_failure) {
|
|
ret = -ENOMEM;
|
|
} else if (buffer) {
|
|
if (out.pos > size)
|
|
ret = -ERANGE;
|
|
else
|
|
memcpy(buffer, out.buf, out.pos);
|
|
}
|
|
|
|
printbuf_exit(&out);
|
|
return ret;
|
|
}
|
|
|
|
static int bch2_xattr_bcachefs_get(const struct xattr_handler *handler,
|
|
struct dentry *dentry, struct inode *vinode,
|
|
const char *name, void *buffer, size_t size)
|
|
{
|
|
return __bch2_xattr_bcachefs_get(handler, dentry, vinode,
|
|
name, buffer, size, false);
|
|
}
|
|
|
|
struct inode_opt_set {
|
|
int id;
|
|
u64 v;
|
|
bool defined;
|
|
};
|
|
|
|
static int inode_opt_set_fn(struct btree_trans *trans,
|
|
struct bch_inode_info *inode,
|
|
struct bch_inode_unpacked *bi,
|
|
void *p)
|
|
{
|
|
struct inode_opt_set *s = p;
|
|
|
|
if (s->defined)
|
|
bi->bi_fields_set |= 1U << s->id;
|
|
else
|
|
bi->bi_fields_set &= ~(1U << s->id);
|
|
|
|
bch2_inode_opt_set(bi, s->id, s->v);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bch2_xattr_bcachefs_set(const struct xattr_handler *handler,
|
|
struct mnt_idmap *idmap,
|
|
struct dentry *dentry, struct inode *vinode,
|
|
const char *name, const void *value,
|
|
size_t size, int flags)
|
|
{
|
|
struct bch_inode_info *inode = to_bch_ei(vinode);
|
|
struct bch_fs *c = inode->v.i_sb->s_fs_info;
|
|
const struct bch_option *opt;
|
|
char *buf;
|
|
struct inode_opt_set s;
|
|
int opt_id, inode_opt_id, ret;
|
|
|
|
opt_id = bch2_opt_lookup(name);
|
|
if (opt_id < 0)
|
|
return -EINVAL;
|
|
|
|
opt = bch2_opt_table + opt_id;
|
|
|
|
inode_opt_id = opt_to_inode_opt(opt_id);
|
|
if (inode_opt_id < 0)
|
|
return -EINVAL;
|
|
|
|
s.id = inode_opt_id;
|
|
|
|
if (value) {
|
|
u64 v = 0;
|
|
|
|
buf = kmalloc(size + 1, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
memcpy(buf, value, size);
|
|
buf[size] = '\0';
|
|
|
|
ret = bch2_opt_parse(c, opt, buf, &v, NULL);
|
|
kfree(buf);
|
|
|
|
if (ret < 0)
|
|
goto err_class_exit;
|
|
|
|
ret = bch2_opt_check_may_set(c, opt_id, v);
|
|
if (ret < 0)
|
|
goto err_class_exit;
|
|
|
|
s.v = v + 1;
|
|
s.defined = true;
|
|
} else {
|
|
/*
|
|
* Check if this option was set on the parent - if so, switched
|
|
* back to inheriting from the parent:
|
|
*
|
|
* rename() also has to deal with keeping inherited options up
|
|
* to date - see bch2_reinherit_attrs()
|
|
*/
|
|
spin_lock(&dentry->d_lock);
|
|
if (!IS_ROOT(dentry)) {
|
|
struct bch_inode_info *dir =
|
|
to_bch_ei(d_inode(dentry->d_parent));
|
|
|
|
s.v = bch2_inode_opt_get(&dir->ei_inode, inode_opt_id);
|
|
} else {
|
|
s.v = 0;
|
|
}
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
s.defined = false;
|
|
}
|
|
|
|
mutex_lock(&inode->ei_update_lock);
|
|
if (inode_opt_id == Inode_opt_project) {
|
|
/*
|
|
* inode fields accessible via the xattr interface are stored
|
|
* with a +1 bias, so that 0 means unset:
|
|
*/
|
|
ret = bch2_set_projid(c, inode, s.v ? s.v - 1 : 0);
|
|
if (ret)
|
|
goto err;
|
|
}
|
|
|
|
ret = bch2_write_inode(c, inode, inode_opt_set_fn, &s, 0);
|
|
err:
|
|
mutex_unlock(&inode->ei_update_lock);
|
|
|
|
if (value &&
|
|
(opt_id == Opt_background_target ||
|
|
opt_id == Opt_background_compression ||
|
|
(opt_id == Opt_compression && !inode_opt_get(c, &inode->ei_inode, background_compression))))
|
|
bch2_set_rebalance_needs_scan(c, inode->ei_inode.bi_inum);
|
|
|
|
err_class_exit:
|
|
return bch2_err_class(ret);
|
|
}
|
|
|
|
static const struct xattr_handler bch_xattr_bcachefs_handler = {
|
|
.prefix = "bcachefs.",
|
|
.get = bch2_xattr_bcachefs_get,
|
|
.set = bch2_xattr_bcachefs_set,
|
|
};
|
|
|
|
static int bch2_xattr_bcachefs_get_effective(
|
|
const struct xattr_handler *handler,
|
|
struct dentry *dentry, struct inode *vinode,
|
|
const char *name, void *buffer, size_t size)
|
|
{
|
|
return __bch2_xattr_bcachefs_get(handler, dentry, vinode,
|
|
name, buffer, size, true);
|
|
}
|
|
|
|
static const struct xattr_handler bch_xattr_bcachefs_effective_handler = {
|
|
.prefix = "bcachefs_effective.",
|
|
.get = bch2_xattr_bcachefs_get_effective,
|
|
.set = bch2_xattr_bcachefs_set,
|
|
};
|
|
|
|
#endif /* NO_BCACHEFS_FS */
|
|
|
|
const struct xattr_handler *bch2_xattr_handlers[] = {
|
|
&bch_xattr_user_handler,
|
|
#ifdef CONFIG_BCACHEFS_POSIX_ACL
|
|
&nop_posix_acl_access,
|
|
&nop_posix_acl_default,
|
|
#endif
|
|
&bch_xattr_trusted_handler,
|
|
&bch_xattr_security_handler,
|
|
#ifndef NO_BCACHEFS_FS
|
|
&bch_xattr_bcachefs_handler,
|
|
&bch_xattr_bcachefs_effective_handler,
|
|
#endif
|
|
NULL
|
|
};
|
|
|
|
static const struct xattr_handler *bch_xattr_handler_map[] = {
|
|
[KEY_TYPE_XATTR_INDEX_USER] = &bch_xattr_user_handler,
|
|
[KEY_TYPE_XATTR_INDEX_POSIX_ACL_ACCESS] =
|
|
&nop_posix_acl_access,
|
|
[KEY_TYPE_XATTR_INDEX_POSIX_ACL_DEFAULT] =
|
|
&nop_posix_acl_default,
|
|
[KEY_TYPE_XATTR_INDEX_TRUSTED] = &bch_xattr_trusted_handler,
|
|
[KEY_TYPE_XATTR_INDEX_SECURITY] = &bch_xattr_security_handler,
|
|
};
|
|
|
|
static const struct xattr_handler *bch2_xattr_type_to_handler(unsigned type)
|
|
{
|
|
return type < ARRAY_SIZE(bch_xattr_handler_map)
|
|
? bch_xattr_handler_map[type]
|
|
: NULL;
|
|
}
|