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-rw-r--r--fs/bcachefs/xattr.c653
1 files changed, 653 insertions, 0 deletions
diff --git a/fs/bcachefs/xattr.c b/fs/bcachefs/xattr.c
new file mode 100644
index 000000000000..5a1858fb9879
--- /dev/null
+++ b/fs/bcachefs/xattr.c
@@ -0,0 +1,653 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "bcachefs.h"
+#include "acl.h"
+#include "bkey_methods.h"
+#include "btree_update.h"
+#include "extents.h"
+#include "fs.h"
+#include "rebalance.h"
+#include "str_hash.h"
+#include "xattr.h"
+
+#include <linux/dcache.h>
+#include <linux/posix_acl_xattr.h>
+#include <linux/xattr.h>
+
+static const struct xattr_handler *bch2_xattr_type_to_handler(unsigned);
+
+static u64 bch2_xattr_hash(const struct bch_hash_info *info,
+ const struct xattr_search_key *key)
+{
+ struct bch_str_hash_ctx ctx;
+
+ bch2_str_hash_init(&ctx, info);
+ bch2_str_hash_update(&ctx, info, &key->type, sizeof(key->type));
+ bch2_str_hash_update(&ctx, info, key->name.name, key->name.len);
+
+ return bch2_str_hash_end(&ctx, info);
+}
+
+static u64 xattr_hash_key(const struct bch_hash_info *info, const void *key)
+{
+ return bch2_xattr_hash(info, key);
+}
+
+static u64 xattr_hash_bkey(const struct bch_hash_info *info, struct bkey_s_c k)
+{
+ struct bkey_s_c_xattr x = bkey_s_c_to_xattr(k);
+
+ return bch2_xattr_hash(info,
+ &X_SEARCH(x.v->x_type, x.v->x_name, x.v->x_name_len));
+}
+
+static bool xattr_cmp_key(struct bkey_s_c _l, const void *_r)
+{
+ struct bkey_s_c_xattr l = bkey_s_c_to_xattr(_l);
+ const struct xattr_search_key *r = _r;
+
+ return l.v->x_type != r->type ||
+ l.v->x_name_len != r->name.len ||
+ memcmp(l.v->x_name, r->name.name, r->name.len);
+}
+
+static bool xattr_cmp_bkey(struct bkey_s_c _l, struct bkey_s_c _r)
+{
+ struct bkey_s_c_xattr l = bkey_s_c_to_xattr(_l);
+ struct bkey_s_c_xattr r = bkey_s_c_to_xattr(_r);
+
+ return l.v->x_type != r.v->x_type ||
+ l.v->x_name_len != r.v->x_name_len ||
+ memcmp(l.v->x_name, r.v->x_name, r.v->x_name_len);
+}
+
+const struct bch_hash_desc bch2_xattr_hash_desc = {
+ .btree_id = BTREE_ID_xattrs,
+ .key_type = KEY_TYPE_xattr,
+ .hash_key = xattr_hash_key,
+ .hash_bkey = xattr_hash_bkey,
+ .cmp_key = xattr_cmp_key,
+ .cmp_bkey = xattr_cmp_bkey,
+};
+
+int bch2_xattr_invalid(struct bch_fs *c, struct bkey_s_c k,
+ enum bkey_invalid_flags flags,
+ struct printbuf *err)
+{
+ struct bkey_s_c_xattr xattr = bkey_s_c_to_xattr(k);
+ unsigned val_u64s = xattr_val_u64s(xattr.v->x_name_len,
+ le16_to_cpu(xattr.v->x_val_len));
+ int ret = 0;
+
+ bkey_fsck_err_on(bkey_val_u64s(k.k) < val_u64s, c, err,
+ xattr_val_size_too_small,
+ "value too small (%zu < %u)",
+ bkey_val_u64s(k.k), val_u64s);
+
+ /* XXX why +4 ? */
+ val_u64s = xattr_val_u64s(xattr.v->x_name_len,
+ le16_to_cpu(xattr.v->x_val_len) + 4);
+
+ bkey_fsck_err_on(bkey_val_u64s(k.k) > val_u64s, c, err,
+ xattr_val_size_too_big,
+ "value too big (%zu > %u)",
+ bkey_val_u64s(k.k), val_u64s);
+
+ bkey_fsck_err_on(!bch2_xattr_type_to_handler(xattr.v->x_type), c, err,
+ xattr_invalid_type,
+ "invalid type (%u)", xattr.v->x_type);
+
+ bkey_fsck_err_on(memchr(xattr.v->x_name, '\0', xattr.v->x_name_len), c, err,
+ xattr_name_invalid_chars,
+ "xattr name has invalid characters");
+fsck_err:
+ return ret;
+}
+
+void bch2_xattr_to_text(struct printbuf *out, struct bch_fs *c,
+ struct bkey_s_c k)
+{
+ const struct xattr_handler *handler;
+ struct bkey_s_c_xattr xattr = bkey_s_c_to_xattr(k);
+
+ handler = bch2_xattr_type_to_handler(xattr.v->x_type);
+ if (handler && handler->prefix)
+ prt_printf(out, "%s", handler->prefix);
+ else if (handler)
+ prt_printf(out, "(type %u)", xattr.v->x_type);
+ else
+ prt_printf(out, "(unknown type %u)", xattr.v->x_type);
+
+ prt_printf(out, "%.*s:%.*s",
+ xattr.v->x_name_len,
+ xattr.v->x_name,
+ le16_to_cpu(xattr.v->x_val_len),
+ (char *) xattr_val(xattr.v));
+
+ if (xattr.v->x_type == KEY_TYPE_XATTR_INDEX_POSIX_ACL_ACCESS ||
+ xattr.v->x_type == KEY_TYPE_XATTR_INDEX_POSIX_ACL_DEFAULT) {
+ prt_char(out, ' ');
+ bch2_acl_to_text(out, xattr_val(xattr.v),
+ le16_to_cpu(xattr.v->x_val_len));
+ }
+}
+
+static int bch2_xattr_get_trans(struct btree_trans *trans, struct bch_inode_info *inode,
+ const char *name, void *buffer, size_t size, int type)
+{
+ struct bch_hash_info hash = bch2_hash_info_init(trans->c, &inode->ei_inode);
+ struct xattr_search_key search = X_SEARCH(type, name, strlen(name));
+ struct btree_iter iter;
+ struct bkey_s_c_xattr xattr;
+ struct bkey_s_c k;
+ int ret;
+
+ ret = bch2_hash_lookup(trans, &iter, bch2_xattr_hash_desc, &hash,
+ inode_inum(inode), &search, 0);
+ if (ret)
+ goto err1;
+
+ k = bch2_btree_iter_peek_slot(&iter);
+ ret = bkey_err(k);
+ if (ret)
+ goto err2;
+
+ xattr = bkey_s_c_to_xattr(k);
+ ret = le16_to_cpu(xattr.v->x_val_len);
+ if (buffer) {
+ if (ret > size)
+ ret = -ERANGE;
+ else
+ memcpy(buffer, xattr_val(xattr.v), ret);
+ }
+err2:
+ bch2_trans_iter_exit(trans, &iter);
+err1:
+ return ret < 0 && bch2_err_matches(ret, ENOENT) ? -ENODATA : ret;
+}
+
+int bch2_xattr_set(struct btree_trans *trans, subvol_inum inum,
+ struct bch_inode_unpacked *inode_u,
+ const struct bch_hash_info *hash_info,
+ const char *name, const void *value, size_t size,
+ int type, int flags)
+{
+ struct bch_fs *c = trans->c;
+ struct btree_iter inode_iter = { NULL };
+ int ret;
+
+ ret = bch2_subvol_is_ro_trans(trans, inum.subvol) ?:
+ bch2_inode_peek(trans, &inode_iter, inode_u, inum, BTREE_ITER_INTENT);
+ if (ret)
+ return ret;
+
+ inode_u->bi_ctime = bch2_current_time(c);
+
+ ret = bch2_inode_write(trans, &inode_iter, inode_u);
+ bch2_trans_iter_exit(trans, &inode_iter);
+
+ if (ret)
+ return ret;
+
+ if (value) {
+ struct bkey_i_xattr *xattr;
+ unsigned namelen = strlen(name);
+ unsigned u64s = BKEY_U64s +
+ xattr_val_u64s(namelen, size);
+
+ if (u64s > U8_MAX)
+ return -ERANGE;
+
+ xattr = bch2_trans_kmalloc(trans, u64s * sizeof(u64));
+ if (IS_ERR(xattr))
+ return PTR_ERR(xattr);
+
+ bkey_xattr_init(&xattr->k_i);
+ xattr->k.u64s = u64s;
+ xattr->v.x_type = type;
+ xattr->v.x_name_len = namelen;
+ xattr->v.x_val_len = cpu_to_le16(size);
+ memcpy(xattr->v.x_name, name, namelen);
+ memcpy(xattr_val(&xattr->v), value, size);
+
+ ret = bch2_hash_set(trans, bch2_xattr_hash_desc, hash_info,
+ inum, &xattr->k_i,
+ (flags & XATTR_CREATE ? BCH_HASH_SET_MUST_CREATE : 0)|
+ (flags & XATTR_REPLACE ? BCH_HASH_SET_MUST_REPLACE : 0));
+ } else {
+ struct xattr_search_key search =
+ X_SEARCH(type, name, strlen(name));
+
+ ret = bch2_hash_delete(trans, bch2_xattr_hash_desc,
+ hash_info, inum, &search);
+ }
+
+ if (bch2_err_matches(ret, ENOENT))
+ ret = flags & XATTR_REPLACE ? -ENODATA : 0;
+
+ return ret;
+}
+
+struct xattr_buf {
+ char *buf;
+ size_t len;
+ size_t used;
+};
+
+static int __bch2_xattr_emit(const char *prefix,
+ const char *name, size_t name_len,
+ struct xattr_buf *buf)
+{
+ const size_t prefix_len = strlen(prefix);
+ const size_t total_len = prefix_len + name_len + 1;
+
+ if (buf->buf) {
+ if (buf->used + total_len > buf->len)
+ return -ERANGE;
+
+ memcpy(buf->buf + buf->used, prefix, prefix_len);
+ memcpy(buf->buf + buf->used + prefix_len,
+ name, name_len);
+ buf->buf[buf->used + prefix_len + name_len] = '\0';
+ }
+
+ buf->used += total_len;
+ return 0;
+}
+
+static int bch2_xattr_emit(struct dentry *dentry,
+ const struct bch_xattr *xattr,
+ struct xattr_buf *buf)
+{
+ const struct xattr_handler *handler =
+ bch2_xattr_type_to_handler(xattr->x_type);
+
+ return handler && (!handler->list || handler->list(dentry))
+ ? __bch2_xattr_emit(handler->prefix ?: handler->name,
+ xattr->x_name, xattr->x_name_len, buf)
+ : 0;
+}
+
+static int bch2_xattr_list_bcachefs(struct bch_fs *c,
+ struct bch_inode_unpacked *inode,
+ struct xattr_buf *buf,
+ bool all)
+{
+ const char *prefix = all ? "bcachefs_effective." : "bcachefs.";
+ unsigned id;
+ int ret = 0;
+ u64 v;
+
+ for (id = 0; id < Inode_opt_nr; id++) {
+ v = bch2_inode_opt_get(inode, id);
+ if (!v)
+ continue;
+
+ if (!all &&
+ !(inode->bi_fields_set & (1 << id)))
+ continue;
+
+ ret = __bch2_xattr_emit(prefix, bch2_inode_opts[id],
+ strlen(bch2_inode_opts[id]), buf);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
+ssize_t bch2_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size)
+{
+ struct bch_fs *c = dentry->d_sb->s_fs_info;
+ struct bch_inode_info *inode = to_bch_ei(dentry->d_inode);
+ struct btree_trans *trans = bch2_trans_get(c);
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ struct xattr_buf buf = { .buf = buffer, .len = buffer_size };
+ u64 offset = 0, inum = inode->ei_inode.bi_inum;
+ u32 snapshot;
+ int ret;
+retry:
+ bch2_trans_begin(trans);
+ iter = (struct btree_iter) { NULL };
+
+ ret = bch2_subvolume_get_snapshot(trans, inode->ei_subvol, &snapshot);
+ if (ret)
+ goto err;
+
+ for_each_btree_key_upto_norestart(trans, iter, BTREE_ID_xattrs,
+ SPOS(inum, offset, snapshot),
+ POS(inum, U64_MAX), 0, k, ret) {
+ if (k.k->type != KEY_TYPE_xattr)
+ continue;
+
+ ret = bch2_xattr_emit(dentry, bkey_s_c_to_xattr(k).v, &buf);
+ if (ret)
+ break;
+ }
+
+ offset = iter.pos.offset;
+ bch2_trans_iter_exit(trans, &iter);
+err:
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ goto retry;
+
+ bch2_trans_put(trans);
+
+ if (ret)
+ goto out;
+
+ ret = bch2_xattr_list_bcachefs(c, &inode->ei_inode, &buf, false);
+ if (ret)
+ goto out;
+
+ ret = bch2_xattr_list_bcachefs(c, &inode->ei_inode, &buf, true);
+ if (ret)
+ goto out;
+
+ return buf.used;
+out:
+ return bch2_err_class(ret);
+}
+
+static int bch2_xattr_get_handler(const struct xattr_handler *handler,
+ struct dentry *dentry, struct inode *vinode,
+ const char *name, void *buffer, size_t size)
+{
+ struct bch_inode_info *inode = to_bch_ei(vinode);
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ int ret = bch2_trans_do(c, NULL, NULL, 0,
+ bch2_xattr_get_trans(trans, inode, name, buffer, size, handler->flags));
+
+ return bch2_err_class(ret);
+}
+
+static int bch2_xattr_set_handler(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;
+ struct bch_hash_info hash = bch2_hash_info_init(c, &inode->ei_inode);
+ struct bch_inode_unpacked inode_u;
+ int ret;
+
+ ret = bch2_trans_run(c,
+ commit_do(trans, NULL, NULL, 0,
+ bch2_xattr_set(trans, inode_inum(inode), &inode_u,
+ &hash, name, value, size,
+ handler->flags, flags)) ?:
+ (bch2_inode_update_after_write(trans, inode, &inode_u, ATTR_CTIME), 0));
+
+ return bch2_err_class(ret);
+}
+
+static const struct xattr_handler bch_xattr_user_handler = {
+ .prefix = XATTR_USER_PREFIX,
+ .get = bch2_xattr_get_handler,
+ .set = bch2_xattr_set_handler,
+ .flags = KEY_TYPE_XATTR_INDEX_USER,
+};
+
+static bool bch2_xattr_trusted_list(struct dentry *dentry)
+{
+ return capable(CAP_SYS_ADMIN);
+}
+
+static const struct xattr_handler bch_xattr_trusted_handler = {
+ .prefix = XATTR_TRUSTED_PREFIX,
+ .list = bch2_xattr_trusted_list,
+ .get = bch2_xattr_get_handler,
+ .set = bch2_xattr_set_handler,
+ .flags = KEY_TYPE_XATTR_INDEX_TRUSTED,
+};
+
+static const struct xattr_handler bch_xattr_security_handler = {
+ .prefix = XATTR_SECURITY_PREFIX,
+ .get = bch2_xattr_get_handler,
+ .set = bch2_xattr_set_handler,
+ .flags = KEY_TYPE_XATTR_INDEX_SECURITY,
+};
+
+#ifndef NO_BCACHEFS_FS
+
+static int opt_to_inode_opt(int id)
+{
+ switch (id) {
+#define x(name, ...) \
+ case Opt_##name: return Inode_opt_##name;
+ BCH_INODE_OPTS()
+#undef x
+ default:
+ return -1;
+ }
+}
+
+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,
+ bool all)
+{
+ struct bch_inode_info *inode = to_bch_ei(vinode);
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ struct bch_opts opts =
+ bch2_inode_opts_to_opts(&inode->ei_inode);
+ const struct bch_option *opt;
+ int id, inode_opt_id;
+ struct printbuf out = PRINTBUF;
+ int ret;
+ u64 v;
+
+ id = bch2_opt_lookup(name);
+ if (id < 0 || !bch2_opt_is_inode_opt(id))
+ return -EINVAL;
+
+ inode_opt_id = opt_to_inode_opt(id);
+ if (inode_opt_id < 0)
+ return -EINVAL;
+
+ opt = bch2_opt_table + id;
+
+ if (!bch2_opt_defined_by_id(&opts, id))
+ return -ENODATA;
+
+ if (!all &&
+ !(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)
+ return ret;
+
+ ret = bch2_opt_check_may_set(c, opt_id, v);
+ if (ret < 0)
+ return ret;
+
+ 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_compression ||
+ opt_id == Opt_background_target))
+ bch2_set_rebalance_needs_scan(c, inode->ei_inode.bi_inum);
+
+ 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;
+}
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-06-28 13:12:54 +0000