mirror of
https://github.com/checkpoint-restore/criu
synced 2025-08-22 01:51:51 +00:00
bd7bf7bd39
The is_foo_link readlinks the lfd to check. This makes anon-inodes dumping readlink several times to find proper dump ops. Optimize this thing. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
130 lines
2.7 KiB
C
130 lines
2.7 KiB
C
#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <sys/stat.h>
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#include <sys/statfs.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/eventfd.h>
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#include "compiler.h"
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#include "asm/types.h"
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#include "fdset.h"
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#include "eventfd.h"
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#include "proc_parse.h"
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#include "image.h"
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#include "util.h"
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#include "log.h"
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#include "protobuf.h"
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#include "protobuf/eventfd.pb-c.h"
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#undef LOG_PREFIX
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#define LOG_PREFIX "eventfd: "
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struct eventfd_file_info {
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EventfdFileEntry *efe;
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struct file_desc d;
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};
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/* Checks if file descriptor @lfd is eventfd */
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int is_eventfd_link(char *link)
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{
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return is_anon_link_type(link, "[eventfd]");
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}
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static void pr_info_eventfd(char *action, EventfdFileEntry *efe)
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{
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pr_info("%s: id %#08x flags %#04x counter %#016"PRIx64"\n",
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action, efe->id, efe->flags, efe->counter);
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}
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struct eventfd_dump_arg {
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u32 id;
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const struct fd_parms *p;
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bool dumped;
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};
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static int dump_eventfd_entry(union fdinfo_entries *e, void *arg)
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{
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struct eventfd_dump_arg *da = arg;
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if (da->dumped) {
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pr_err("Several counters in a file?\n");
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return -1;
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}
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da->dumped = true;
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e->efd.id = da->id;
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e->efd.flags = da->p->flags;
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e->efd.fown = (FownEntry *)&da->p->fown;
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pr_info_eventfd("Dumping ", &e->efd);
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return pb_write_one(fdset_fd(glob_fdset, CR_FD_EVENTFD_FILE),
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&e->efd, PB_EVENTFD_FILE);
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}
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static int dump_one_eventfd(int lfd, u32 id, const struct fd_parms *p)
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{
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struct eventfd_dump_arg da = { .id = id, .p = p, };
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return parse_fdinfo(lfd, FD_TYPES__EVENTFD, dump_eventfd_entry, &da);
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}
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const struct fdtype_ops eventfd_dump_ops = {
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.type = FD_TYPES__EVENTFD,
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.dump = dump_one_eventfd,
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};
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static int eventfd_open(struct file_desc *d)
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{
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struct eventfd_file_info *info;
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int tmp;
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info = container_of(d, struct eventfd_file_info, d);
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tmp = eventfd(info->efe->counter, 0);
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if (tmp < 0) {
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pr_perror("Can't create eventfd %#08x",
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info->efe->id);
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return -1;
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}
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if (rst_file_params(tmp, info->efe->fown, info->efe->flags)) {
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pr_perror("Can't restore params on eventfd %#08x",
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info->efe->id);
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goto err_close;
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}
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return tmp;
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err_close:
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close(tmp);
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return -1;
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}
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static struct file_desc_ops eventfd_desc_ops = {
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.type = FD_TYPES__EVENTFD,
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.open = eventfd_open,
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};
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static int collect_one_efd(void *obj, ProtobufCMessage *msg)
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{
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struct eventfd_file_info *info = obj;
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info->efe = pb_msg(msg, EventfdFileEntry);
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pr_info_eventfd("Collected ", info->efe);
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return file_desc_add(&info->d, info->efe->id, &eventfd_desc_ops);
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}
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struct collect_image_info eventfd_cinfo = {
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.fd_type = CR_FD_EVENTFD_FILE,
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.pb_type = PB_EVENTFD_FILE,
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.priv_size = sizeof(struct eventfd_file_info),
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.collect = collect_one_efd,
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};
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