diff options
Diffstat (limited to 'fs/bcachefs/xattr.c')
| -rw-r--r-- | fs/bcachefs/xattr.c | 642 |
1 files changed, 0 insertions, 642 deletions
diff --git a/fs/bcachefs/xattr.c b/fs/bcachefs/xattr.c deleted file mode 100644 index 627f153798c6..000000000000 --- a/fs/bcachefs/xattr.c +++ /dev/null @@ -1,642 +0,0 @@ -// 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_and_value, 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_and_value, 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_and_value, r.v->x_name_and_value, 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_validate(struct bch_fs *c, struct bkey_s_c k, - struct bkey_validate_context from) -{ - 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, 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, 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, xattr_invalid_type, - "invalid type (%u)", xattr.v->x_type); - - bkey_fsck_err_on(memchr(xattr.v->x_name_and_value, '\0', xattr.v->x_name_len), - c, 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); - - unsigned name_len = xattr.v->x_name_len; - unsigned val_len = le16_to_cpu(xattr.v->x_val_len); - unsigned max_name_val_bytes = bkey_val_bytes(xattr.k) - - offsetof(struct bch_xattr, x_name_and_value); - - val_len = min_t(int, val_len, max_name_val_bytes - name_len); - name_len = min(name_len, max_name_val_bytes); - - prt_printf(out, "%.*s:%.*s", - name_len, xattr.v->x_name_and_value, - 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 k = bch2_hash_lookup(trans, &iter, bch2_xattr_hash_desc, &hash, - inode_inum(inode), &search, 0); - int ret = bkey_err(k); - if (ret) - return ret; - - struct bkey_s_c_xattr 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); - } - bch2_trans_iter_exit(trans, &iter); - return 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 = {}; - 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; - - /* - * Besides the ctime update, extents, dirents and xattrs updates require - * that an inode update also happens - to ensure that if a key exists in - * one of those btrees with a given snapshot ID an inode is also present - */ - 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_and_value, 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 ? STR_HASH_must_create : 0)| - (flags & XATTR_REPLACE ? STR_HASH_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 inline const char *bch2_xattr_prefix(unsigned type, struct dentry *dentry) -{ - const struct xattr_handler *handler = bch2_xattr_type_to_handler(type); - - if (!xattr_handler_can_list(handler, dentry)) - return NULL; - - return xattr_prefix(handler); -} - -static int bch2_xattr_emit(struct dentry *dentry, - const struct bch_xattr *xattr, - struct xattr_buf *buf) -{ - const char *prefix; - - prefix = bch2_xattr_prefix(xattr->x_type, dentry); - if (!prefix) - return 0; - - return __bch2_xattr_emit(prefix, xattr->x_name_and_value, xattr->x_name_len, buf); -} - -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 xattr_buf buf = { .buf = buffer, .len = buffer_size }; - u64 offset = 0, inum = inode->ei_inode.bi_inum; - - int ret = bch2_trans_run(c, - for_each_btree_key_in_subvolume_max(trans, iter, BTREE_ID_xattrs, - POS(inum, offset), - POS(inum, U64_MAX), - inode->ei_inum.subvol, 0, k, ({ - if (k.k->type != KEY_TYPE_xattr) - continue; - - bch2_xattr_emit(dentry, bkey_s_c_to_xattr(k).v, &buf); - }))) ?: - bch2_xattr_list_bcachefs(c, &inode->ei_inode, &buf, false) ?: - bch2_xattr_list_bcachefs(c, &inode->ei_inode, &buf, true); - - return ret ? bch2_err_class(ret) : buf.used; -} - -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, - bch2_xattr_get_trans(trans, inode, name, buffer, size, handler->flags)); - - if (ret < 0 && bch2_err_matches(ret, ENOENT)) - ret = -ENODATA; - - 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->id == Inode_opt_casefold) { - int ret = bch2_inode_set_casefold(trans, inode_inum(inode), bi, s->v); - if (ret) - return ret; - } - - 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_hook_pre_set(c, NULL, 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); -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); -} - -/* Noop - xattrs in the bcachefs_effective namespace are inherited */ -static int bch2_xattr_bcachefs_set_effective(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) -{ - return 0; -} - -static const struct xattr_handler bch_xattr_bcachefs_effective_handler = { - .prefix = "bcachefs_effective.", - .get = bch2_xattr_bcachefs_get_effective, - .set = bch2_xattr_bcachefs_set_effective, -}; - -#endif /* NO_BCACHEFS_FS */ - -const struct xattr_handler * const bch2_xattr_handlers[] = { - &bch_xattr_user_handler, - &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; -} |