+++ /dev/null
-// 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;
-}
projects / bcachefs-tools-debian / blobdiff