src/readahead/readahead-collect.c

	readahead-collect.c revision 4826f0b7b5c0aefa08b8cc7ef64d69027f84da2c
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek/***
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek  This file is part of systemd.
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek  Copyright 2010 Lennart Poettering
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek  systemd is free software; you can redistribute it and/or modify it
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek  under the terms of the GNU Lesser General Public License as published by
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek  the Free Software Foundation; either version 2.1 of the License, or
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek  (at your option) any later version.
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek  systemd is distributed in the hope that it will be useful, but
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek  WITHOUT ANY WARRANTY; without even the implied warranty of
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek  Lesser General Public License for more details.
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek  You should have received a copy of the GNU Lesser General Public License
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek  along with systemd; If not, see <http://www.gnu.org/licenses/>.
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek***/
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering#include <errno.h>
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek#include <inttypes.h>
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek#include <fcntl.h>
3f6fd1ba65f962702753c4ad284b588e59689a23Lennart Poettering#include <linux/limits.h>
3f6fd1ba65f962702753c4ad284b588e59689a23Lennart Poettering#include <stdbool.h>
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek#include <stdio.h>
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek#include <stdlib.h>
3f6fd1ba65f962702753c4ad284b588e59689a23Lennart Poettering#include <string.h>
3f6fd1ba65f962702753c4ad284b588e59689a23Lennart Poettering#include <sys/select.h>
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek#include <sys/time.h>
3f6fd1ba65f962702753c4ad284b588e59689a23Lennart Poettering#include <sys/types.h>
3f6fd1ba65f962702753c4ad284b588e59689a23Lennart Poettering#include <sys/stat.h>
d71839afd88589247d8dd42b2b09d024f521749dZbigniew Jędrzejewski-Szmek#include <unistd.h>
2cf4172a71860c6e44edd27a3b68047ae062d7fcLennart Poettering#include <linux/fanotify.h>
24882e06c135584f16f31ba8a00fecde8b7f6fadLennart Poettering#include <sys/signalfd.h>
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering#include <sys/poll.h>
3f6fd1ba65f962702753c4ad284b588e59689a23Lennart Poettering#include <sys/mman.h>
24882e06c135584f16f31ba8a00fecde8b7f6fadLennart Poettering#include <linux/fs.h>
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek#include <linux/fiemap.h>
799a8f39d8eb9ea725e85a598c0f5dbd658c8ba7Zbigniew Jędrzejewski-Szmek#include <sys/ioctl.h>
799a8f39d8eb9ea725e85a598c0f5dbd658c8ba7Zbigniew Jędrzejewski-Szmek#include <sys/vfs.h>
799a8f39d8eb9ea725e85a598c0f5dbd658c8ba7Zbigniew Jędrzejewski-Szmek#include <getopt.h>
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek#include <sys/inotify.h>
29fc0ddcd737af906986d4029579d4dfe838ba02Zbigniew Jędrzejewski-Szmek#include <math.h>
2cf4172a71860c6e44edd27a3b68047ae062d7fcLennart Poettering
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek#ifdef HAVE_FANOTIFY_INIT
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek#include <sys/fanotify.h>
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek#endif
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek#include <systemd/sd-daemon.h>
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek#include "missing.h"
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek#include "util.h"
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek#include "set.h"
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek#include "ioprio.h"
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek#include "readahead-common.h"
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek#include "virt.h"
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
2cf4172a71860c6e44edd27a3b68047ae062d7fcLennart Poettering/* fixme:
2cf4172a71860c6e44edd27a3b68047ae062d7fcLennart Poettering *
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek * - detect ssd on btrfs/lvm...
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek * - read ahead directories
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek * - gzip?
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek * - remount rw?
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek * - handle files where nothing is in mincore
8847551bcbfa8265bae04f567bb1aadc7b480325Zbigniew Jędrzejewski-Szmek * - does ioprio_set work with fadvise()?
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek */
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmekstatic ReadaheadShared *shared = NULL;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmekstatic usec_t starttime;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek/* Avoid collisions with the NULL pointer */
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek#define SECTOR_TO_PTR(s) ULONG_TO_PTR((s)+1)
8847551bcbfa8265bae04f567bb1aadc7b480325Zbigniew Jędrzejewski-Szmek#define PTR_TO_SECTOR(p) (PTR_TO_ULONG(p)-1)
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmekstatic int btrfs_defrag(int fd) {
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        struct btrfs_ioctl_vol_args data = { .fd = fd };
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        return ioctl(fd, BTRFS_IOC_DEFRAG, &data);
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek}
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmekstatic int pack_file(FILE *pack, const char *fn, bool on_btrfs) {
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        struct stat st;
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        void *start = MAP_FAILED;
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        uint8_t *vec;
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        uint32_t b, c;
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        uint64_t inode;
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        size_t l, pages;
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        bool mapped;
c33b329709ebe2755181980a050d02ec7c81ed87Michal Schmidt        int r = 0, fd = -1, k;
c33b329709ebe2755181980a050d02ec7c81ed87Michal Schmidt
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        assert(pack);
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        assert(fn);
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        fd = open(fn, O_RDONLY|O_CLOEXEC|O_NOATIME|O_NOCTTY|O_NOFOLLOW);
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        if (fd < 0) {
d71839afd88589247d8dd42b2b09d024f521749dZbigniew Jędrzejewski-Szmek
d71839afd88589247d8dd42b2b09d024f521749dZbigniew Jędrzejewski-Szmek                if (errno == ENOENT)
d71839afd88589247d8dd42b2b09d024f521749dZbigniew Jędrzejewski-Szmek                        return 0;
d71839afd88589247d8dd42b2b09d024f521749dZbigniew Jędrzejewski-Szmek
d71839afd88589247d8dd42b2b09d024f521749dZbigniew Jędrzejewski-Szmek                if (errno == EPERM || errno == EACCES)
d71839afd88589247d8dd42b2b09d024f521749dZbigniew Jędrzejewski-Szmek                        return 0;
d71839afd88589247d8dd42b2b09d024f521749dZbigniew Jędrzejewski-Szmek
d71839afd88589247d8dd42b2b09d024f521749dZbigniew Jędrzejewski-Szmek                log_warning("open(%s) failed: %m", fn);
d71839afd88589247d8dd42b2b09d024f521749dZbigniew Jędrzejewski-Szmek                r = -errno;
eb56eb9b40950f1edcffdb7313f8de4f8572a6d5Michal Schmidt                goto finish;
eb56eb9b40950f1edcffdb7313f8de4f8572a6d5Michal Schmidt        }
eb56eb9b40950f1edcffdb7313f8de4f8572a6d5Michal Schmidt
d71839afd88589247d8dd42b2b09d024f521749dZbigniew Jędrzejewski-Szmek        k = file_verify(fd, fn, arg_file_size_max, &st);
d71839afd88589247d8dd42b2b09d024f521749dZbigniew Jędrzejewski-Szmek        if (k <= 0) {
eb56eb9b40950f1edcffdb7313f8de4f8572a6d5Michal Schmidt                r = k;
eb56eb9b40950f1edcffdb7313f8de4f8572a6d5Michal Schmidt                goto finish;
eb56eb9b40950f1edcffdb7313f8de4f8572a6d5Michal Schmidt        }
d71839afd88589247d8dd42b2b09d024f521749dZbigniew Jędrzejewski-Szmek
d71839afd88589247d8dd42b2b09d024f521749dZbigniew Jędrzejewski-Szmek        if (on_btrfs)
d71839afd88589247d8dd42b2b09d024f521749dZbigniew Jędrzejewski-Szmek                btrfs_defrag(fd);
d71839afd88589247d8dd42b2b09d024f521749dZbigniew Jędrzejewski-Szmek
d71839afd88589247d8dd42b2b09d024f521749dZbigniew Jędrzejewski-Szmek        l = PAGE_ALIGN(st.st_size);
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        start = mmap(NULL, l, PROT_READ, MAP_SHARED, fd, 0);
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        if (start == MAP_FAILED) {
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                log_warning("mmap(%s) failed: %m", fn);
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                r = -errno;
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                goto finish;
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        }
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        pages = l / page_size();
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        vec = alloca(pages);
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        memset(vec, 0, pages);
dacd6cee76a08331b8c8616c5f30f70ee49aa2f9Lennart Poettering        if (mincore(start, l, vec) < 0) {
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                log_warning("mincore(%s) failed: %m", fn);
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                r = -errno;
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                goto finish;
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        }
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        fputs(fn, pack);
dacd6cee76a08331b8c8616c5f30f70ee49aa2f9Lennart Poettering        fputc('\n', pack);
dacd6cee76a08331b8c8616c5f30f70ee49aa2f9Lennart Poettering
dacd6cee76a08331b8c8616c5f30f70ee49aa2f9Lennart Poettering        /* Store the inode, so that we notice when the file is deleted */
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        inode = (uint64_t) st.st_ino;
dacd6cee76a08331b8c8616c5f30f70ee49aa2f9Lennart Poettering        fwrite(&inode, sizeof(inode), 1, pack);
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek
dacd6cee76a08331b8c8616c5f30f70ee49aa2f9Lennart Poettering        mapped = false;
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        for (c = 0; c < pages; c++) {
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                bool new_mapped = !!(vec[c] & 1);
dacd6cee76a08331b8c8616c5f30f70ee49aa2f9Lennart Poettering
dacd6cee76a08331b8c8616c5f30f70ee49aa2f9Lennart Poettering                if (!mapped && new_mapped)
dacd6cee76a08331b8c8616c5f30f70ee49aa2f9Lennart Poettering                        b = c;
dacd6cee76a08331b8c8616c5f30f70ee49aa2f9Lennart Poettering                else if (mapped && !new_mapped) {
dacd6cee76a08331b8c8616c5f30f70ee49aa2f9Lennart Poettering                        fwrite(&b, sizeof(b), 1, pack);
dacd6cee76a08331b8c8616c5f30f70ee49aa2f9Lennart Poettering                        fwrite(&c, sizeof(c), 1, pack);
dacd6cee76a08331b8c8616c5f30f70ee49aa2f9Lennart Poettering
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                        log_debug("%s: page %u to %u", fn, b, c);
dacd6cee76a08331b8c8616c5f30f70ee49aa2f9Lennart Poettering                }
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                mapped = new_mapped;
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        }
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        /* We don't write any range data if we should read the entire file */
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        if (mapped && b > 0) {
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                fwrite(&b, sizeof(b), 1, pack);
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                fwrite(&c, sizeof(c), 1, pack);
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                log_debug("%s: page %u to %u", fn, b, c);
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        }
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek
36d4739a68c3edafe4d145d525a26de4ef0b8e5aZbigniew Jędrzejewski-Szmek        /* End marker */
36d4739a68c3edafe4d145d525a26de4ef0b8e5aZbigniew Jędrzejewski-Szmek        b = 0;
eb56eb9b40950f1edcffdb7313f8de4f8572a6d5Michal Schmidt        fwrite(&b, sizeof(b), 1, pack);
eb56eb9b40950f1edcffdb7313f8de4f8572a6d5Michal Schmidt        fwrite(&b, sizeof(b), 1, pack);
eb56eb9b40950f1edcffdb7313f8de4f8572a6d5Michal Schmidt
eb56eb9b40950f1edcffdb7313f8de4f8572a6d5Michal Schmidtfinish:
36d4739a68c3edafe4d145d525a26de4ef0b8e5aZbigniew Jędrzejewski-Szmek        if (start != MAP_FAILED)
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                munmap(start, l);
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        if (fd >= 0)
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                close_nointr_nofail(fd);
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        return r;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek}
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmekstatic unsigned long fd_first_block(int fd) {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        struct {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                struct fiemap fiemap;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                struct fiemap_extent extent;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        } data = {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                .fiemap.fm_length = ~0ULL,
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                .fiemap.fm_extent_count = 1,
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        };
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (ioctl(fd, FS_IOC_FIEMAP, &data) < 0)
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                return 0;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (data.fiemap.fm_mapped_extents <= 0)
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                return 0;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (data.fiemap.fm_extents[0].fe_flags & FIEMAP_EXTENT_UNKNOWN)
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                return 0;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        return (unsigned long) data.fiemap.fm_extents[0].fe_physical;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek}
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmekstruct item {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        const char *path;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        unsigned long block;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        unsigned long bin;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek};
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmekstatic int qsort_compare(const void *a, const void *b) {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        const struct item *i, *j;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        i = a;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        j = b;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        /* sort by bin first */
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (i->bin < j->bin)
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                return -1;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (i->bin > j->bin)
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                return 1;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        /* then sort by sector */
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (i->block < j->block)
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                return -1;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (i->block > j->block)
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                return 1;
b88a40a7e592e0a4a2e6e8eb1ed3721989ba5d0ePhilippe De Swert
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        return strcmp(i->path, j->path);
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek}
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmekstatic int collect(const char *root) {
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        enum {
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                FD_FANOTIFY,  /* Get the actual fs events */
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                FD_SIGNAL,
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                FD_INOTIFY,   /* We get notifications to quit early via this fd */
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                _FD_MAX
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        };
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        struct pollfd pollfd[_FD_MAX] = {};
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        int fanotify_fd = -1, signal_fd = -1, inotify_fd = -1, r = 0;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        pid_t my_pid;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        Hashmap *files = NULL;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        Iterator i;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        char *p, *q;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        sigset_t mask;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        FILE *pack = NULL;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        char *pack_fn_new = NULL, *pack_fn = NULL;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        bool on_ssd, on_btrfs;
5dabb1e04e4521abf040e77a8322b70e7acdc7b0Zbigniew Jędrzejewski-Szmek        struct statfs sfs;
5dabb1e04e4521abf040e77a8322b70e7acdc7b0Zbigniew Jędrzejewski-Szmek        usec_t not_after;
5dabb1e04e4521abf040e77a8322b70e7acdc7b0Zbigniew Jędrzejewski-Szmek        uint64_t previous_block_readahead;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        bool previous_block_readahead_set = false;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        assert(root);
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (asprintf(&pack_fn, "%s/.readahead", root) < 0) {
29fc0ddcd737af906986d4029579d4dfe838ba02Zbigniew Jędrzejewski-Szmek                r = log_oom();
799a8f39d8eb9ea725e85a598c0f5dbd658c8ba7Zbigniew Jędrzejewski-Szmek                goto finish;
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek        }
29fc0ddcd737af906986d4029579d4dfe838ba02Zbigniew Jędrzejewski-Szmek
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek        starttime = now(CLOCK_MONOTONIC);
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek        /* If there's no pack file yet we lower the kernel readahead
8847551bcbfa8265bae04f567bb1aadc7b480325Zbigniew Jędrzejewski-Szmek         * so that mincore() is accurate. If there is a pack file
8847551bcbfa8265bae04f567bb1aadc7b480325Zbigniew Jędrzejewski-Szmek         * already we assume it is accurate enough so that kernel
8847551bcbfa8265bae04f567bb1aadc7b480325Zbigniew Jędrzejewski-Szmek         * readahead is never triggered. */
8847551bcbfa8265bae04f567bb1aadc7b480325Zbigniew Jędrzejewski-Szmek        previous_block_readahead_set =
29fc0ddcd737af906986d4029579d4dfe838ba02Zbigniew Jędrzejewski-Szmek                access(pack_fn, F_OK) < 0 &&
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek                block_get_readahead(root, &previous_block_readahead) >= 0 &&
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek                block_set_readahead(root, 8*1024) >= 0;
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek        if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0)) < 0)
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek                log_warning("Failed to set IDLE IO priority class: %m");
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        assert_se(sigemptyset(&mask) == 0);
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        sigset_add_many(&mask, SIGINT, SIGTERM, -1);
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) {
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                log_error("signalfd(): %m");
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                r = -errno;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                goto finish;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        }
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        files = hashmap_new(string_hash_func, string_compare_func);
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (!files) {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                log_error("Failed to allocate set.");
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                r = -ENOMEM;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                goto finish;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        }
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        fanotify_fd = fanotify_init(FAN_CLOEXEC|FAN_NONBLOCK, O_RDONLY|O_LARGEFILE|O_CLOEXEC|O_NOATIME);
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (fanotify_fd < 0)  {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                log_error("Failed to create fanotify object: %m");
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                r = -errno;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                goto finish;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        }
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (fanotify_mark(fanotify_fd, FAN_MARK_ADD|FAN_MARK_MOUNT, FAN_OPEN, AT_FDCWD, root) < 0) {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                log_error("Failed to mark %s: %m", root);
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                r = -errno;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                goto finish;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        }
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        inotify_fd = open_inotify();
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (inotify_fd < 0) {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                r = inotify_fd;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                goto finish;
1fa2f38f0f011010bf57522b42fcc168856a7003Zbigniew Jędrzejewski-Szmek        }
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        not_after = now(CLOCK_MONOTONIC) + arg_timeout;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        my_pid = getpid();
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        pollfd[FD_FANOTIFY].fd = fanotify_fd;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        pollfd[FD_FANOTIFY].events = POLLIN;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        pollfd[FD_SIGNAL].fd = signal_fd;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        pollfd[FD_SIGNAL].events = POLLIN;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        pollfd[FD_INOTIFY].fd = inotify_fd;
56f64d95763a799ba4475daf44d8e9f72a1bd474Michal Schmidt        pollfd[FD_INOTIFY].events = POLLIN;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        sd_notify(0,
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                  "READY=1\n"
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                  "STATUS=Collecting readahead data");
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        log_debug("Collecting...");
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (access("/run/systemd/readahead/cancel", F_OK) >= 0) {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                log_debug("Collection canceled");
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                r = -ECANCELED;
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                goto finish;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        }
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (access("/run/systemd/readahead/done", F_OK) >= 0) {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                log_debug("Got termination request");
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                goto done;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        }
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        for (;;) {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                union {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                        struct fanotify_event_metadata metadata;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                        char buffer[4096];
8201af08fa09c2bd0f005fbe262f27e2c5bd2d86Zbigniew Jędrzejewski-Szmek                } data;
8201af08fa09c2bd0f005fbe262f27e2c5bd2d86Zbigniew Jędrzejewski-Szmek                ssize_t n;
8201af08fa09c2bd0f005fbe262f27e2c5bd2d86Zbigniew Jędrzejewski-Szmek                struct fanotify_event_metadata *m;
8201af08fa09c2bd0f005fbe262f27e2c5bd2d86Zbigniew Jędrzejewski-Szmek                usec_t t;
8201af08fa09c2bd0f005fbe262f27e2c5bd2d86Zbigniew Jędrzejewski-Szmek                int h;
8201af08fa09c2bd0f005fbe262f27e2c5bd2d86Zbigniew Jędrzejewski-Szmek
8201af08fa09c2bd0f005fbe262f27e2c5bd2d86Zbigniew Jędrzejewski-Szmek                if (hashmap_size(files) > arg_files_max) {
8201af08fa09c2bd0f005fbe262f27e2c5bd2d86Zbigniew Jędrzejewski-Szmek                        log_debug("Reached maximum number of read ahead files, ending collection.");
8201af08fa09c2bd0f005fbe262f27e2c5bd2d86Zbigniew Jędrzejewski-Szmek                        break;
8201af08fa09c2bd0f005fbe262f27e2c5bd2d86Zbigniew Jędrzejewski-Szmek                }
8201af08fa09c2bd0f005fbe262f27e2c5bd2d86Zbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                t = now(CLOCK_MONOTONIC);
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                if (t >= not_after) {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                        log_debug("Reached maximum collection time, ending collection.");
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                        break;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                }
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                if ((h = poll(pollfd, _FD_MAX, (int) ((not_after - t) / USEC_PER_MSEC))) < 0) {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                        if (errno == EINTR)
e1ad6e245dcf63faa8f183063eb97678f4f9ac94Lukas Nykryn                                continue;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                        log_error("poll(): %m");
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                        r = -errno;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                        goto finish;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                }
4a62c710b62a5a3c7a8a278b810b9d5b5a0c8f4fMichal Schmidt
4a62c710b62a5a3c7a8a278b810b9d5b5a0c8f4fMichal Schmidt                if (h == 0) {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                        log_debug("Reached maximum collection time, ending collection.");
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                        break;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                }
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                if (pollfd[FD_SIGNAL].revents) {
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                        log_debug("Got signal.");
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                        break;
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                }
eb56eb9b40950f1edcffdb7313f8de4f8572a6d5Michal Schmidt
eb56eb9b40950f1edcffdb7313f8de4f8572a6d5Michal Schmidt                if (pollfd[FD_INOTIFY].revents) {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                        uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX];
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                        struct inotify_event *e;
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                        if ((n = read(inotify_fd, &inotify_buffer, sizeof(inotify_buffer))) < 0) {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                if (errno == EINTR || errno == EAGAIN)
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                                        continue;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                log_error("Failed to read inotify event: %m");
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                r = -errno;
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                                goto finish;
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                        }
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                        e = (struct inotify_event*) inotify_buffer;
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                        while (n > 0) {
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                                size_t step;
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                                if ((e->mask & IN_CREATE) && streq(e->name, "cancel")) {
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                                        log_debug("Collection canceled");
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                                        r = -ECANCELED;
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                                        goto finish;
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                                }
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                                if ((e->mask & IN_CREATE) && streq(e->name, "done")) {
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                                        log_debug("Got termination request");
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                                        goto done;
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                                }
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                                step = sizeof(struct inotify_event) + e->len;
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                                assert(step <= (size_t) n);
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek
72c0a2c255b172ebbb2a2b7dab7c9aec4c9582d9Lennart Poettering                                e = (struct inotify_event*) ((uint8_t*) e + step);
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                                n -= step;
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                        }
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                }
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                if ((n = read(fanotify_fd, &data, sizeof(data))) < 0) {
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                        if (errno == EINTR || errno == EAGAIN)
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                                continue;
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                        /* fanotify sometimes returns EACCES on read()
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                         * where it shouldn't. For now let's just
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                         * ignore it here (which is safe), but
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                         * eventually this should be
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                         * dropped when the kernel is fixed.
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek                         *
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                         * https://bugzilla.redhat.com/show_bug.cgi?id=707577 */
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                        if (errno == EACCES)
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                continue;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                        log_error("Failed to read event: %m");
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                        r = -errno;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                        goto finish;
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek                }
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek                for (m = &data.metadata; FAN_EVENT_OK(m, n); m = FAN_EVENT_NEXT(m, n)) {
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek                        char fn[PATH_MAX];
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek                        int k;
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek                        if (m->fd < 0)
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek                                goto next_iteration;
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek                        if (m->pid == my_pid)
5bc891206dd8eb4e4df58f502b0184b8426caf22Zbigniew Jędrzejewski-Szmek                                goto next_iteration;
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek                        __sync_synchronize();
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek                        if (m->pid == shared->replay)
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek                                goto next_iteration;
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek                        snprintf(fn, sizeof(fn), "/proc/self/fd/%i", m->fd);
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek                        char_array_0(fn);
5bc891206dd8eb4e4df58f502b0184b8426caf22Zbigniew Jędrzejewski-Szmek
5bc891206dd8eb4e4df58f502b0184b8426caf22Zbigniew Jędrzejewski-Szmek                        if ((k = readlink_malloc(fn, &p)) >= 0) {
5bc891206dd8eb4e4df58f502b0184b8426caf22Zbigniew Jędrzejewski-Szmek                                if (startswith(p, "/tmp") ||
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                                    endswith(p, " (deleted)") ||
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                    hashmap_get(files, p))
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                        /* Not interesting, or
eb56eb9b40950f1edcffdb7313f8de4f8572a6d5Michal Schmidt                                         * already read */
eb56eb9b40950f1edcffdb7313f8de4f8572a6d5Michal Schmidt                                        free(p);
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                else {
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                                        unsigned long ul;
eb56eb9b40950f1edcffdb7313f8de4f8572a6d5Michal Schmidt                                        usec_t entrytime;
eb56eb9b40950f1edcffdb7313f8de4f8572a6d5Michal Schmidt                                        struct item *entry;
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                                        entry = new0(struct item, 1);
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                        if (!entry) {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                                r = log_oom();
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                                goto finish;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                        }
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                        ul = fd_first_block(m->fd);
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                                        entrytime = now(CLOCK_MONOTONIC);
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                                        entry->block = ul;
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                                        entry->path = strdup(p);
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                        if (!entry->path) {
5bc891206dd8eb4e4df58f502b0184b8426caf22Zbigniew Jędrzejewski-Szmek                                                free(entry);
5bc891206dd8eb4e4df58f502b0184b8426caf22Zbigniew Jędrzejewski-Szmek                                                r = log_oom();
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                                goto finish;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                        }
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                        entry->bin = (entrytime - starttime) / 2000000;
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                        if ((k = hashmap_put(files, p, entry)) < 0) {
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                                                log_warning("set_put() failed: %s", strerror(-k));
a3152e7655231b94fa7b9582906fb86ab00b9c99Zbigniew Jędrzejewski-Szmek                                                free(p);
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                        }
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                                }
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                        } else
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                                log_warning("readlink(%s) failed: %s", fn, strerror(-k));
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                next_iteration:
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                        if (m->fd >= 0)
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                                close_nointr_nofail(m->fd);
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                }
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        }
30776485c5bc2d9c356e875f2aee874d22c393b7Zbigniew Jędrzejewski-Szmek
30776485c5bc2d9c356e875f2aee874d22c393b7Zbigniew Jędrzejewski-Szmekdone:
30776485c5bc2d9c356e875f2aee874d22c393b7Zbigniew Jędrzejewski-Szmek        if (fanotify_fd >= 0) {
30776485c5bc2d9c356e875f2aee874d22c393b7Zbigniew Jędrzejewski-Szmek                close_nointr_nofail(fanotify_fd);
30776485c5bc2d9c356e875f2aee874d22c393b7Zbigniew Jędrzejewski-Szmek                fanotify_fd = -1;
30776485c5bc2d9c356e875f2aee874d22c393b7Zbigniew Jędrzejewski-Szmek        }
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        log_debug("Writing Pack File...");
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        on_ssd = fs_on_ssd(root) > 0;
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        log_debug("On SSD: %s", yes_no(on_ssd));
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        on_btrfs = statfs(root, &sfs) >= 0 && sfs.f_type == (__SWORD_TYPE) BTRFS_SUPER_MAGIC;
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        log_debug("On btrfs: %s", yes_no(on_btrfs));
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        if (asprintf(&pack_fn_new, "%s/.readahead.new", root) < 0) {
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                r = log_oom();
1fa2f38f0f011010bf57522b42fcc168856a7003Zbigniew Jędrzejewski-Szmek                goto finish;
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        }
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        pack = fopen(pack_fn_new, "we");
1fa2f38f0f011010bf57522b42fcc168856a7003Zbigniew Jędrzejewski-Szmek        if (!pack) {
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                log_error("Failed to open pack file: %m");
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                r = -errno;
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                goto finish;
1fa2f38f0f011010bf57522b42fcc168856a7003Zbigniew Jędrzejewski-Szmek        }
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        fputs(CANONICAL_HOST READAHEAD_PACK_FILE_VERSION, pack);
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        putc(on_ssd ? 'S' : 'R', pack);
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        if (on_ssd || on_btrfs) {
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek                /* On SSD or on btrfs, just write things out in the
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                 * order the files were accessed. */
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
29fc0ddcd737af906986d4029579d4dfe838ba02Zbigniew Jędrzejewski-Szmek                HASHMAP_FOREACH_KEY(q, p, files, i)
29fc0ddcd737af906986d4029579d4dfe838ba02Zbigniew Jędrzejewski-Szmek                        pack_file(pack, p, on_btrfs);
29fc0ddcd737af906986d4029579d4dfe838ba02Zbigniew Jędrzejewski-Szmek        } else {
29fc0ddcd737af906986d4029579d4dfe838ba02Zbigniew Jędrzejewski-Szmek                struct item *ordered, *j;
29fc0ddcd737af906986d4029579d4dfe838ba02Zbigniew Jędrzejewski-Szmek                unsigned k, n;
29fc0ddcd737af906986d4029579d4dfe838ba02Zbigniew Jędrzejewski-Szmek
29fc0ddcd737af906986d4029579d4dfe838ba02Zbigniew Jędrzejewski-Szmek                /* On rotating media, order things by the block
29fc0ddcd737af906986d4029579d4dfe838ba02Zbigniew Jędrzejewski-Szmek                 * numbers */
bf257aed057efd113f1b84e037fde09ffeed32eeJosh Triplett
bf257aed057efd113f1b84e037fde09ffeed32eeJosh Triplett                log_debug("Ordering...");
bf257aed057efd113f1b84e037fde09ffeed32eeJosh Triplett
bf257aed057efd113f1b84e037fde09ffeed32eeJosh Triplett                n = hashmap_size(files);
29fc0ddcd737af906986d4029579d4dfe838ba02Zbigniew Jędrzejewski-Szmek                if (!(ordered = new(struct item, n))) {
29fc0ddcd737af906986d4029579d4dfe838ba02Zbigniew Jędrzejewski-Szmek                        r = log_oom();
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                        goto finish;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                }
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
dad29dff1925a114e20d4eb7b47fca23c4f25fd7Lennart Poettering                j = ordered;
dad29dff1925a114e20d4eb7b47fca23c4f25fd7Lennart Poettering                HASHMAP_FOREACH_KEY(q, p, files, i) {
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek                        memcpy(j, q, sizeof(struct item));
50a0b0717563d08c027a16a896bff8d7754eab9eZbigniew Jędrzejewski-Szmek                        j++;
1af719edc5958c01c19204fb68d6fc45c9eea85cZbigniew Jędrzejewski-Szmek                }
1af719edc5958c01c19204fb68d6fc45c9eea85cZbigniew Jędrzejewski-Szmek
1af719edc5958c01c19204fb68d6fc45c9eea85cZbigniew Jędrzejewski-Szmek                assert(ordered + n == j);
1af719edc5958c01c19204fb68d6fc45c9eea85cZbigniew Jędrzejewski-Szmek
1af719edc5958c01c19204fb68d6fc45c9eea85cZbigniew Jędrzejewski-Szmek                qsort(ordered, n, sizeof(struct item), qsort_compare);
1af719edc5958c01c19204fb68d6fc45c9eea85cZbigniew Jędrzejewski-Szmek
dad29dff1925a114e20d4eb7b47fca23c4f25fd7Lennart Poettering                for (k = 0; k < n; k++)
dad29dff1925a114e20d4eb7b47fca23c4f25fd7Lennart Poettering                        pack_file(pack, ordered[k].path, on_btrfs);
dad29dff1925a114e20d4eb7b47fca23c4f25fd7Lennart Poettering
dad29dff1925a114e20d4eb7b47fca23c4f25fd7Lennart Poettering                free(ordered);
dad29dff1925a114e20d4eb7b47fca23c4f25fd7Lennart Poettering        }
dad29dff1925a114e20d4eb7b47fca23c4f25fd7Lennart Poettering
dad29dff1925a114e20d4eb7b47fca23c4f25fd7Lennart Poettering        log_debug("Finalizing...");
dad29dff1925a114e20d4eb7b47fca23c4f25fd7Lennart Poettering
dad29dff1925a114e20d4eb7b47fca23c4f25fd7Lennart Poettering        fflush(pack);
dad29dff1925a114e20d4eb7b47fca23c4f25fd7Lennart Poettering
dad29dff1925a114e20d4eb7b47fca23c4f25fd7Lennart Poettering        if (ferror(pack)) {
dad29dff1925a114e20d4eb7b47fca23c4f25fd7Lennart Poettering                log_error("Failed to write pack file.");
dad29dff1925a114e20d4eb7b47fca23c4f25fd7Lennart Poettering                r = -EIO;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                goto finish;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        }
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (rename(pack_fn_new, pack_fn) < 0) {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                log_error("Failed to rename readahead file: %m");
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                r = -errno;
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek                goto finish;
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek        }
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        fclose(pack);
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        pack = NULL;
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        log_debug("Done.");
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmekfinish:
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        if (fanotify_fd >= 0)
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                close_nointr_nofail(fanotify_fd);
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (signal_fd >= 0)
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                close_nointr_nofail(signal_fd);
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (inotify_fd >= 0)
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek                close_nointr_nofail(inotify_fd);
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek        if (pack) {
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                fclose(pack);
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                unlink(pack_fn_new);
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        }
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        free(pack_fn_new);
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        free(pack_fn);
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek        while ((p = hashmap_steal_first_key(files)))
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek                free(p);
dad29dff1925a114e20d4eb7b47fca23c4f25fd7Lennart Poettering
722b6795655149a68277b3cffeba711e1d440e5aZbigniew Jędrzejewski-Szmek        hashmap_free(files);
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (previous_block_readahead_set) {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                uint64_t bytes;
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                /* Restore the original kernel readahead setting if we
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                 * changed it, and nobody has overwritten it since
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                 * yet. */
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                if (block_get_readahead(root, &bytes) >= 0 && bytes == 8*1024)
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                        block_set_readahead(root, previous_block_readahead);
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        }
eacbb4d33e2bb5c54311544851140efe3dd0f774Zbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        return r;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek}
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmekint main_collect(const char *root) {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (!root)
3f6fd1ba65f962702753c4ad284b588e59689a23Lennart Poettering                root = "/";
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        /* Skip this step on read-only media. Note that we check the
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek         * underlying block device here, not he read-only flag of the
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek         * file system on top, since that one is most likely mounted
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek         * read-only anyway at boot, even if the underlying block
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek         * device is theoretically writable. */
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        if (fs_on_read_only(root) > 0) {
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                log_info("Disabling readahead collector due to read-only media.");
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek                return EXIT_SUCCESS;
3d090cc6f34e5970765dd1e7ee5e648a056d180dZbigniew Jędrzejewski-Szmek        }
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek        if (!enough_ram()) {
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek                log_info("Disabling readahead collector due to low memory.");
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek                return EXIT_SUCCESS;
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek        }
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek        shared = shared_get();
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek        if (!shared)
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek                return EXIT_FAILURE;
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek        shared->collect = getpid();
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek        __sync_synchronize();
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek        if (collect(root) < 0)
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek                return EXIT_FAILURE;
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek        return EXIT_SUCCESS;
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek}
7449bc1f34c206e3ff8e274cd74e2db950d492a1Zbigniew Jędrzejewski-Szmek