Merging upstream version 6.7.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 653 insertions, 0 deletions

diff --git a/fs/bcachefs/xattr.c b/fs/bcachefs/xattr.c
new file mode 100644
index 0000000000..5a1858fb98
--- /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;
+}