[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen master] tools/xenstore: use struct node_hdr in struct node
commit 1a4b7008e94ec4b938deda96ee8ee316f1f35554 Author: Juergen Gross <jgross@xxxxxxxx> AuthorDate: Mon Aug 14 09:46:59 2023 +0200 Commit: Julien Grall <jgrall@xxxxxxxxxx> CommitDate: Fri Aug 18 13:44:48 2023 +0100 tools/xenstore: use struct node_hdr in struct node Replace some individual fields in struct node with struct node_hdr. This allows to add a helper for calculating the accounted memory size of a node. Signed-off-by: Juergen Gross <jgross@xxxxxxxx> Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx> --- tools/xenstore/xenstored_core.c | 110 ++++++++++++++++----------------- tools/xenstore/xenstored_core.h | 16 +++-- tools/xenstore/xenstored_domain.c | 5 +- tools/xenstore/xenstored_transaction.c | 13 ++-- 4 files changed, 72 insertions(+), 72 deletions(-) diff --git a/tools/xenstore/xenstored_core.c b/tools/xenstore/xenstored_core.c index d7a4f0f1cb..ab4714263d 100644 --- a/tools/xenstore/xenstored_core.c +++ b/tools/xenstore/xenstored_core.c @@ -555,6 +555,12 @@ static void initialize_fds(int *p_sock_pollfd_idx, int *ptimeout) } } +static size_t calc_node_acc_size(const struct node_hdr *hdr) +{ + return sizeof(*hdr) + hdr->num_perms * sizeof(struct xs_permissions) + + hdr->datalen + hdr->childlen; +} + const struct node_hdr *db_fetch(const char *db_name, size_t *size) { const struct node_hdr *hdr; @@ -565,8 +571,7 @@ const struct node_hdr *db_fetch(const char *db_name, size_t *size) return NULL; } - *size = sizeof(*hdr) + hdr->num_perms * sizeof(struct xs_permissions) + - hdr->datalen + hdr->childlen; + *size = calc_node_acc_size(hdr); trace_tdb("read %s size %zu\n", db_name, *size + strlen(db_name)); @@ -726,7 +731,7 @@ struct node *read_node(struct connection *conn, const void *ctx, hdr = db_fetch(db_name, &size); if (hdr == NULL) { - node->generation = NO_GENERATION; + node->hdr.generation = NO_GENERATION; err = access_node(conn, node, NODE_ACCESS_READ, NULL); errno = err ? : ENOENT; goto error; @@ -735,10 +740,7 @@ struct node *read_node(struct connection *conn, const void *ctx, node->parent = NULL; /* Datalen, childlen, number of permissions */ - node->generation = hdr->generation; - node->num_perms = hdr->num_perms; - node->datalen = hdr->datalen; - node->childlen = hdr->childlen; + node->hdr = *hdr; node->acc.domid = perms_from_node_hdr(hdr)->id; node->acc.memory = size; @@ -760,7 +762,7 @@ struct node *read_node(struct connection *conn, const void *ctx, /* Data is binary blob (usually ascii, no nul). */ node->data = node->perms + hdr->num_perms; /* Children is strings, nul separated. */ - node->children = node->data + node->datalen; + node->children = node->data + node->hdr.datalen; if (access_node(conn, node, NODE_ACCESS_READ, NULL)) goto error; @@ -796,9 +798,7 @@ int write_node_raw(struct connection *conn, const char *db_name, if (domain_adjust_node_perms(node)) return errno; - size = sizeof(*hdr) - + node->num_perms * sizeof(node->perms[0]) - + node->datalen + node->childlen; + size = calc_node_acc_size(&node->hdr); /* Call domain_max_chk() in any case in order to record max values. */ if (domain_max_chk(conn, ACC_NODESZ, size) && !no_quota_check) { @@ -815,18 +815,15 @@ int write_node_raw(struct connection *conn, const char *db_name, BUILD_BUG_ON(XENSTORE_PAYLOAD_MAX >= (typeof(hdr->datalen))(-1)); hdr = data; - hdr->generation = node->generation; - hdr->num_perms = node->num_perms; - hdr->datalen = node->datalen; - hdr->childlen = node->childlen; + *hdr = node->hdr; /* Open code perms_from_node_hdr() for the non-const case. */ p = hdr + 1; - memcpy(p, node->perms, node->num_perms * sizeof(*node->perms)); - p += node->num_perms * sizeof(*node->perms); - memcpy(p, node->data, node->datalen); - p += node->datalen; - memcpy(p, node->children, node->childlen); + memcpy(p, node->perms, node->hdr.num_perms * sizeof(*node->perms)); + p += node->hdr.num_perms * sizeof(*node->perms); + memcpy(p, node->data, node->hdr.datalen); + p += node->hdr.datalen; + memcpy(p, node->children, node->hdr.childlen); if (db_write(conn, db_name, data, size, &node->acc, mode, no_quota_check)) @@ -1216,7 +1213,7 @@ static char *node_perms_to_strings(const struct node *node, unsigned int *len) char *strings = NULL; char buffer[MAX_STRLEN(unsigned int) + 1]; - for (*len = 0, i = 0; i < node->num_perms; i++) { + for (*len = 0, i = 0; i < node->hdr.num_perms; i++) { if (!xenstore_perm_to_string(&node->perms[i], buffer, sizeof(buffer))) return NULL; @@ -1287,7 +1284,7 @@ static int send_directory(const void *ctx, struct connection *conn, if (!node) return errno; - send_reply(conn, XS_DIRECTORY, node->children, node->childlen); + send_reply(conn, XS_DIRECTORY, node->children, node->hdr.childlen); return 0; } @@ -1312,10 +1309,11 @@ static int send_directory_part(const void *ctx, struct connection *conn, /* Second arg is childlist offset. */ off = atoi(in->buffer + strlen(in->buffer) + 1); - genlen = snprintf(gen, sizeof(gen), "%"PRIu64, node->generation) + 1; + genlen = snprintf(gen, sizeof(gen), "%"PRIu64, node->hdr.generation) + + 1; /* Offset behind list: just return a list with an empty string. */ - if (off >= node->childlen) { + if (off >= node->hdr.childlen) { gen[genlen] = 0; send_reply(conn, XS_DIRECTORY_PART, gen, genlen + 1); return 0; @@ -1328,7 +1326,7 @@ static int send_directory_part(const void *ctx, struct connection *conn, while (len + strlen(child) < maxlen) { len += strlen(child) + 1; child += strlen(child) + 1; - if (off + len == node->childlen) + if (off + len == node->hdr.childlen) break; } @@ -1338,7 +1336,7 @@ static int send_directory_part(const void *ctx, struct connection *conn, memcpy(data, gen, genlen); memcpy(data + genlen, node->children + off, len); - if (off + len == node->childlen) { + if (off + len == node->hdr.childlen) { data[genlen + len] = 0; len++; } @@ -1358,7 +1356,7 @@ static int do_read(const void *ctx, struct connection *conn, if (!node) return errno; - send_reply(conn, XS_READ, node->data, node->datalen); + send_reply(conn, XS_READ, node->data, node->hdr.datalen); return 0; } @@ -1377,13 +1375,13 @@ static int add_child(const void *ctx, struct node *parent, const char *name) base = basename(name); baselen = strlen(base) + 1; - children = talloc_array(ctx, char, parent->childlen + baselen); + children = talloc_array(ctx, char, parent->hdr.childlen + baselen); if (!children) return ENOMEM; - memcpy(children, parent->children, parent->childlen); - memcpy(children + parent->childlen, base, baselen); + memcpy(children, parent->children, parent->hdr.childlen); + memcpy(children + parent->hdr.childlen, base, baselen); parent->children = children; - parent->childlen += baselen; + parent->hdr.childlen += baselen; return 0; } @@ -1436,9 +1434,9 @@ static struct node *construct_node(struct connection *conn, const void *ctx, node->name = talloc_steal(node, names[levels - 1]); /* Inherit permissions, unpriv domains own what they create. */ - node->num_perms = parent->num_perms; + node->hdr.num_perms = parent->hdr.num_perms; node->perms = talloc_memdup(node, parent->perms, - node->num_perms * + node->hdr.num_perms * sizeof(*node->perms)); if (!node->perms) goto nomem; @@ -1447,7 +1445,7 @@ static struct node *construct_node(struct connection *conn, const void *ctx, /* No children, no data */ node->children = node->data = NULL; - node->childlen = node->datalen = 0; + node->hdr.childlen = node->hdr.datalen = 0; node->acc.memory = 0; node->parent = parent; @@ -1499,7 +1497,7 @@ static struct node *create_node(struct connection *conn, const void *ctx, ta_node_created(conn->transaction); node->data = data; - node->datalen = datalen; + node->hdr.datalen = datalen; /* * We write out the nodes bottom up. @@ -1579,7 +1577,7 @@ static int do_write(const void *ctx, struct connection *conn, return errno; } else { node->data = in->buffer + offset; - node->datalen = datalen; + node->hdr.datalen = datalen; if (write_node(conn, node, NODE_MODIFY, false)) return errno; } @@ -1627,8 +1625,8 @@ static int remove_child_entry(struct connection *conn, struct node *node, { size_t childlen = strlen(node->children + offset); - memdel(node->children, offset, childlen + 1, node->childlen); - node->childlen -= childlen + 1; + memdel(node->children, offset, childlen + 1, node->hdr.childlen); + node->hdr.childlen -= childlen + 1; return write_node(conn, node, NODE_MODIFY, true); } @@ -1638,8 +1636,9 @@ static int delete_child(struct connection *conn, { unsigned int i; - for (i = 0; i < node->childlen; i += strlen(node->children+i) + 1) { - if (streq(node->children+i, childname)) { + for (i = 0; i < node->hdr.childlen; + i += strlen(node->children + i) + 1) { + if (streq(node->children + i, childname)) { errno = remove_child_entry(conn, node, i) ? EIO : 0; return errno; } @@ -1906,7 +1905,7 @@ int walk_node_tree(const void *ctx, struct connection *conn, const char *root, /* node == NULL possible only for the initial loop iteration. */ if (node) { /* Go one step up if ret or if last child finished. */ - if (ret || node->childoff >= node->childlen) { + if (ret || node->childoff >= node->hdr.childlen) { parent = node->parent; /* Call function AFTER processing a node. */ ret = walk_call_func(ctx, conn, node, parent, @@ -2343,10 +2342,10 @@ static void manual_node(const char *name, const char *child) node->name = name; node->perms = &perms; - node->num_perms = 1; + node->hdr.num_perms = 1; node->children = (char *)child; if (child) - node->childlen = strlen(child) + 1; + node->hdr.childlen = strlen(child) + 1; if (write_node(NULL, node, NODE_CREATE, false)) barf_perror("Could not create initial node %s", name); @@ -3214,12 +3213,12 @@ static int dump_state_node(const void *ctx, struct connection *conn, sn.conn_id = 0; sn.ta_id = 0; sn.ta_access = 0; - sn.perm_n = node->num_perms; + sn.perm_n = node->hdr.num_perms; sn.path_len = pathlen; - sn.data_len = node->datalen; - head.length += node->num_perms * sizeof(*sn.perms); + sn.data_len = node->hdr.datalen; + head.length += node->hdr.num_perms * sizeof(*sn.perms); head.length += pathlen; - head.length += node->datalen; + head.length += node->hdr.datalen; head.length = ROUNDUP(head.length, 3); if (fwrite(&head, sizeof(head), 1, fp) != 1) @@ -3227,14 +3226,15 @@ static int dump_state_node(const void *ctx, struct connection *conn, if (fwrite(&sn, sizeof(sn), 1, fp) != 1) return dump_state_node_err(data, "Dump node state error"); - ret = dump_state_node_perms(fp, node->perms, node->num_perms); + ret = dump_state_node_perms(fp, node->perms, node->hdr.num_perms); if (ret) return dump_state_node_err(data, ret); if (fwrite(node->name, pathlen, 1, fp) != 1) return dump_state_node_err(data, "Dump node path error"); - if (node->datalen && fwrite(node->data, node->datalen, 1, fp) != 1) + if (node->hdr.datalen && + fwrite(node->data, node->hdr.datalen, 1, fp) != 1) return dump_state_node_err(data, "Dump node data error"); ret = dump_state_align(fp); @@ -3419,17 +3419,17 @@ void read_state_node(const void *ctx, const void *state) node->acc.memory = 0; node->name = name; - node->generation = ++generation; - node->datalen = sn->data_len; + node->hdr.generation = ++generation; + node->hdr.datalen = sn->data_len; node->data = name + sn->path_len; - node->childlen = 0; + node->hdr.childlen = 0; node->children = NULL; - node->num_perms = sn->perm_n; + node->hdr.num_perms = sn->perm_n; node->perms = talloc_array(node, struct xs_permissions, - node->num_perms); + node->hdr.num_perms); if (!node->perms) barf("allocation error restoring node"); - for (i = 0; i < node->num_perms; i++) { + for (i = 0; i < node->hdr.num_perms; i++) { switch (sn->perms[i].access) { case 'r': node->perms[i].perms = XS_PERM_READ; diff --git a/tools/xenstore/xenstored_core.h b/tools/xenstore/xenstored_core.h index 4bed462dda..cbed412a86 100644 --- a/tools/xenstore/xenstored_core.h +++ b/tools/xenstore/xenstored_core.h @@ -181,6 +181,7 @@ extern struct list_head connections; */ struct node_hdr { uint64_t generation; +#define NO_GENERATION ~((uint64_t)0) uint16_t num_perms; uint16_t datalen; uint32_t childlen; @@ -197,6 +198,10 @@ struct node_account_data { }; struct node { + /* Copied to/from data base. */ + struct node_hdr hdr; + + /* Xenstore path. */ const char *name; /* Name used to access data base. */ const char *db_name; @@ -204,20 +209,13 @@ struct node { /* Parent (optional) */ struct node *parent; - /* Generation count. */ - uint64_t generation; -#define NO_GENERATION ~((uint64_t)0) - /* Permissions. */ - unsigned int num_perms; struct xs_permissions *perms; /* Contents. */ - unsigned int datalen; void *data; /* Children, each nul-terminated. */ - unsigned int childlen; unsigned int childoff; /* Used by walk_node_tree() internally. */ char *children; @@ -259,7 +257,7 @@ static inline unsigned int get_node_owner(const struct node *node) static inline void node_to_node_perms(const struct node *node, struct node_perms *perms) { - perms->num = node->num_perms; + perms->num = node->hdr.num_perms; perms->p = node->perms; } @@ -277,7 +275,7 @@ static inline unsigned int perm_for_conn_from_node(struct connection *conn, static inline void node_perms_to_node(const struct node_perms *perms, struct node *node) { - node->num_perms = perms->num; + node->hdr.num_perms = perms->num; node->perms = perms->p; } diff --git a/tools/xenstore/xenstored_domain.c b/tools/xenstore/xenstored_domain.c index 1ba73d9db2..fdf1095acb 100644 --- a/tools/xenstore/xenstored_domain.c +++ b/tools/xenstore/xenstored_domain.c @@ -1335,10 +1335,11 @@ int domain_adjust_node_perms(struct node *node) { unsigned int i; - for (i = 1; i < node->num_perms; i++) { + for (i = 1; i < node->hdr.num_perms; i++) { if (node->perms[i].perms & XS_PERM_IGNORE) continue; - if (!chk_domain_generation(node->perms[i].id, node->generation)) + if (!chk_domain_generation(node->perms[i].id, + node->hdr.generation)) node->perms[i].perms |= XS_PERM_IGNORE; } diff --git a/tools/xenstore/xenstored_transaction.c b/tools/xenstore/xenstored_transaction.c index 213a2c436c..1f892b002d 100644 --- a/tools/xenstore/xenstored_transaction.c +++ b/tools/xenstore/xenstored_transaction.c @@ -232,7 +232,7 @@ int access_node(struct connection *conn, struct node *node, bool introduce = false; if (type != NODE_ACCESS_READ) { - node->generation = ++generation; + node->hdr.generation = ++generation; if (conn && !conn->transaction) wrl_apply_debit_direct(conn); } @@ -259,12 +259,13 @@ int access_node(struct connection *conn, struct node *node, if (!i->trans_name) goto nomem; i->node = strchr(i->trans_name, '/') + 1; - if (node->generation != NO_GENERATION && node->num_perms) { + if (node->hdr.generation != NO_GENERATION && + node->hdr.num_perms) { i->perms.p = talloc_array(i, struct xs_permissions, - node->num_perms); + node->hdr.num_perms); if (!i->perms.p) goto nomem; - i->perms.num = node->num_perms; + i->perms.num = node->hdr.num_perms; memcpy(i->perms.p, node->perms, i->perms.num * sizeof(*i->perms.p)); } @@ -282,9 +283,9 @@ int access_node(struct connection *conn, struct node *node, * from the write types. */ if (type == NODE_ACCESS_READ) { - i->generation = node->generation; + i->generation = node->hdr.generation; i->check_gen = true; - if (node->generation != NO_GENERATION) { + if (node->hdr.generation != NO_GENERATION) { ret = write_node_raw(conn, i->trans_name, node, NODE_CREATE, true); if (ret) -- generated by git-patchbot for /home/xen/git/xen.git#master
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