/* * libeio implementation * * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann * All rights reserved. * * Redistribution and use in source and binary forms, with or without modifica- * tion, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * * Alternatively, the contents of this file may be used under the terms of * the GNU General Public License ("GPL") version 2 or any later version, * in which case the provisions of the GPL are applicable instead of * the above. If you wish to allow the use of your version of this file * only under the terms of the GPL and not to allow others to use your * version of this file under the BSD license, indicate your decision * by deleting the provisions above and replace them with the notice * and other provisions required by the GPL. If you do not delete the * provisions above, a recipient may use your version of this file under * either the BSD or the GPL. */ #if !defined(_WIN32) && !defined(EMBED_LIBEIO) # include "config.h" #endif #include "eio.h" #include "ecb.h" #ifdef EIO_STACKSIZE # define X_STACKSIZE EIO_STACKSIZE #endif #include "xthread.h" #include #include #include #include #include #include #include #include #include #include /* intptr_t comes from unistd.h, says POSIX/UNIX/tradition */ /* intptr_t only comes from stdint.h, says idiot openbsd coder */ #if HAVE_STDINT_H # include #endif #ifndef ECANCELED # define ECANCELED EDOM #endif #ifndef ELOOP # define ELOOP EDOM #endif #if !defined(ENOTSOCK) && defined(WSAENOTSOCK) # define ENOTSOCK WSAENOTSOCK #endif static void eio_destroy (eio_req *req); #ifndef EIO_FINISH # define EIO_FINISH(req) ((req)->finish) && !EIO_CANCELLED (req) ? (req)->finish (req) : 0 #endif #ifndef EIO_DESTROY # define EIO_DESTROY(req) do { if ((req)->destroy) (req)->destroy (req); } while (0) #endif #ifndef EIO_FEED # define EIO_FEED(req) do { if ((req)->feed ) (req)->feed (req); } while (0) #endif #ifndef EIO_FD_TO_WIN32_HANDLE # define EIO_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd) #endif #ifndef EIO_WIN32_HANDLE_TO_FD # define EIO_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0) #endif #define EIO_ERRNO(errval,retval) ((errno = errval), retval) #define EIO_ENOSYS() EIO_ERRNO (ENOSYS, -1) #ifdef _WIN32 #undef PAGESIZE #define PAGESIZE 4096 /* GetSystemInfo? */ /* TODO: look at how perl does stat (non-sloppy), unlink (ro-files), utime, link */ #ifdef EIO_STRUCT_STATI64 /* look at perl's non-sloppy stat */ #define stat(path,buf) _stati64 (path,buf) #define fstat(fd,buf) _fstati64 (fd,buf) #endif #define lstat(path,buf) stat (path,buf) #define fsync(fd) (FlushFileBuffers ((HANDLE)EIO_FD_TO_WIN32_HANDLE (fd)) ? 0 : EIO_ERRNO (EBADF, -1)) #define mkdir(path,mode) _mkdir (path) #define link(old,neu) (CreateHardLink (neu, old, 0) ? 0 : EIO_ERRNO (ENOENT, -1)) #define chmod(path,mode) _chmod (path, mode) #define dup(fd) _dup (fd) #define dup2(fd1,fd2) _dup2 (fd1, fd2) #define fchmod(fd,mode) EIO_ENOSYS () #define chown(path,uid,gid) EIO_ENOSYS () #define fchown(fd,uid,gid) EIO_ENOSYS () #define truncate(path,offs) EIO_ENOSYS () /* far-miss: SetEndOfFile */ #define ftruncate(fd,offs) EIO_ENOSYS () /* near-miss: SetEndOfFile */ #define mknod(path,mode,dev) EIO_ENOSYS () #define sync() EIO_ENOSYS () #define readlink(path,buf,s) EIO_ENOSYS () #define statvfs(path,buf) EIO_ENOSYS () #define fstatvfs(fd,buf) EIO_ENOSYS () /* rename() uses MoveFile, which fails to overwrite */ #define rename(old,neu) eio__rename (old, neu) static int eio__rename (const char *old, const char *neu) { if (MoveFileEx (old, neu, MOVEFILE_REPLACE_EXISTING)) return 0; /* should steal _dosmaperr */ switch (GetLastError ()) { case ERROR_FILE_NOT_FOUND: case ERROR_PATH_NOT_FOUND: case ERROR_INVALID_DRIVE: case ERROR_NO_MORE_FILES: case ERROR_BAD_NETPATH: case ERROR_BAD_NET_NAME: case ERROR_BAD_PATHNAME: case ERROR_FILENAME_EXCED_RANGE: errno = ENOENT; break; default: errno = EACCES; break; } return -1; } /* we could even stat and see if it exists */ static int symlink (const char *old, const char *neu) { #if WINVER >= 0x0600 if (CreateSymbolicLink (neu, old, 1)) return 0; if (CreateSymbolicLink (neu, old, 0)) return 0; #endif return EIO_ERRNO (ENOENT, -1); } /* POSIX API only */ #define CreateHardLink(neu,old,flags) 0 #define CreateSymbolicLink(neu,old,flags) 0 struct statvfs { int dummy; }; #define DT_DIR EIO_DT_DIR #define DT_REG EIO_DT_REG #define D_NAME(entp) entp.cFileName #define D_TYPE(entp) (entp.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY ? DT_DIR : DT_REG) #else #include #include #include #include #include #include #if _POSIX_MEMLOCK || _POSIX_MEMLOCK_RANGE || _POSIX_MAPPED_FILES #include #endif #define D_NAME(entp) entp->d_name /* POSIX_SOURCE is useless on bsd's, and XOPEN_SOURCE is unreliable there, too */ #if __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__ #define _DIRENT_HAVE_D_TYPE /* sigh */ #define D_INO(de) (de)->d_fileno #define D_NAMLEN(de) (de)->d_namlen #elif __linux || defined d_ino || _XOPEN_SOURCE >= 600 #define D_INO(de) (de)->d_ino #endif #ifdef _D_EXACT_NAMLEN #undef D_NAMLEN #define D_NAMLEN(de) _D_EXACT_NAMLEN (de) #endif #ifdef _DIRENT_HAVE_D_TYPE #define D_TYPE(de) (de)->d_type #endif #ifndef EIO_STRUCT_DIRENT #define EIO_STRUCT_DIRENT struct dirent #endif #endif #if HAVE_UTIMES # include #endif #if HAVE_SYS_SYSCALL_H # include #endif #if HAVE_SYS_PRCTL_H # include #endif #if HAVE_SENDFILE # if __linux # include # elif __FreeBSD__ || defined __APPLE__ # include # include # elif __hpux # include # elif __solaris # include # else # error sendfile support requested but not available # endif #endif #ifndef D_TYPE # define D_TYPE(de) 0 #endif #ifndef D_INO # define D_INO(de) 0 #endif #ifndef D_NAMLEN # define D_NAMLEN(entp) strlen (D_NAME (entp)) #endif /* used for struct dirent, AIX doesn't provide it */ #ifndef NAME_MAX # define NAME_MAX 4096 #endif /* used for readlink etc. */ #ifndef PATH_MAX # define PATH_MAX 4096 #endif /* buffer size for various temporary buffers */ #define EIO_BUFSIZE 65536 #define dBUF \ char *eio_buf = malloc (EIO_BUFSIZE); \ errno = ENOMEM; \ if (!eio_buf) \ return -1 #define FUBd \ free (eio_buf) #define EIO_TICKS ((1000000 + 1023) >> 10) /*****************************************************************************/ struct tmpbuf { void *ptr; int len; }; static void * tmpbuf_get (struct tmpbuf *buf, int len) { if (buf->len < len) { free (buf->ptr); buf->ptr = malloc (buf->len = len); } return buf->ptr; } struct tmpbuf; #if _POSIX_VERSION >= 200809L #define HAVE_AT 1 #define WD2FD(wd) ((wd) ? (wd)->fd : AT_FDCWD) #ifndef O_SEARCH #define O_SEARCH O_RDONLY #endif #else #define HAVE_AT 0 static const char *wd_expand (struct tmpbuf *tmpbuf, eio_wd wd, const char *path); #endif struct eio_pwd { #if HAVE_AT int fd; #endif int len; char str[1]; /* actually, a 0-terminated canonical path */ }; /*****************************************************************************/ #define ETP_PRI_MIN EIO_PRI_MIN #define ETP_PRI_MAX EIO_PRI_MAX struct etp_worker; #define ETP_REQ eio_req #define ETP_DESTROY(req) eio_destroy (req) static int eio_finish (eio_req *req); #define ETP_FINISH(req) eio_finish (req) static void eio_execute (struct etp_worker *self, eio_req *req); #define ETP_EXECUTE(wrk,req) eio_execute (wrk,req) /*****************************************************************************/ #define ETP_NUM_PRI (ETP_PRI_MAX - ETP_PRI_MIN + 1) /* calculate time difference in ~1/EIO_TICKS of a second */ ecb_inline int tvdiff (struct timeval *tv1, struct timeval *tv2) { return (tv2->tv_sec - tv1->tv_sec ) * EIO_TICKS + ((tv2->tv_usec - tv1->tv_usec) >> 10); } static unsigned int started, idle, wanted = 4; static void (*want_poll_cb) (void); static void (*done_poll_cb) (void); static unsigned int max_poll_time; /* reslock */ static unsigned int max_poll_reqs; /* reslock */ static unsigned int nreqs; /* reqlock */ static unsigned int nready; /* reqlock */ static unsigned int npending; /* reqlock */ static unsigned int max_idle = 4; /* maximum number of threads that can idle indefinitely */ static unsigned int idle_timeout = 10; /* number of seconds after which an idle threads exit */ static xmutex_t wrklock; static xmutex_t reslock; static xmutex_t reqlock; static xcond_t reqwait; #if !HAVE_PREADWRITE /* * make our pread/pwrite emulation safe against themselves, but not against * normal read/write by using a mutex. slows down execution a lot, * but that's your problem, not mine. */ static xmutex_t preadwritelock; #endif typedef struct etp_worker { struct tmpbuf tmpbuf; /* locked by wrklock */ struct etp_worker *prev, *next; xthread_t tid; #ifdef ETP_WORKER_COMMON ETP_WORKER_COMMON #endif } etp_worker; static etp_worker wrk_first; /* NOT etp */ #define ETP_WORKER_LOCK(wrk) X_LOCK (wrklock) #define ETP_WORKER_UNLOCK(wrk) X_UNLOCK (wrklock) /* worker threads management */ static void etp_worker_clear (etp_worker *wrk) { } static void ecb_cold etp_worker_free (etp_worker *wrk) { free (wrk->tmpbuf.ptr); wrk->next->prev = wrk->prev; wrk->prev->next = wrk->next; free (wrk); } static unsigned int etp_nreqs (void) { int retval; if (WORDACCESS_UNSAFE) X_LOCK (reqlock); retval = nreqs; if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock); return retval; } static unsigned int etp_nready (void) { unsigned int retval; if (WORDACCESS_UNSAFE) X_LOCK (reqlock); retval = nready; if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock); return retval; } static unsigned int etp_npending (void) { unsigned int retval; if (WORDACCESS_UNSAFE) X_LOCK (reqlock); retval = npending; if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock); return retval; } static unsigned int etp_nthreads (void) { unsigned int retval; if (WORDACCESS_UNSAFE) X_LOCK (reqlock); retval = started; if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock); return retval; } /* * a somewhat faster data structure might be nice, but * with 8 priorities this actually needs <20 insns * per shift, the most expensive operation. */ typedef struct { ETP_REQ *qs[ETP_NUM_PRI], *qe[ETP_NUM_PRI]; /* qstart, qend */ int size; } etp_reqq; static etp_reqq req_queue; static etp_reqq res_queue; static void ecb_noinline ecb_cold reqq_init (etp_reqq *q) { int pri; for (pri = 0; pri < ETP_NUM_PRI; ++pri) q->qs[pri] = q->qe[pri] = 0; q->size = 0; } static int ecb_noinline reqq_push (etp_reqq *q, ETP_REQ *req) { int pri = req->pri; req->next = 0; if (q->qe[pri]) { q->qe[pri]->next = req; q->qe[pri] = req; } else q->qe[pri] = q->qs[pri] = req; return q->size++; } static ETP_REQ * ecb_noinline reqq_shift (etp_reqq *q) { int pri; if (!q->size) return 0; --q->size; for (pri = ETP_NUM_PRI; pri--; ) { eio_req *req = q->qs[pri]; if (req) { if (!(q->qs[pri] = (eio_req *)req->next)) q->qe[pri] = 0; return req; } } abort (); } static int ecb_cold etp_init (void (*want_poll)(void), void (*done_poll)(void)) { X_MUTEX_CREATE (wrklock); X_MUTEX_CREATE (reslock); X_MUTEX_CREATE (reqlock); X_COND_CREATE (reqwait); reqq_init (&req_queue); reqq_init (&res_queue); wrk_first.next = wrk_first.prev = &wrk_first; started = 0; idle = 0; nreqs = 0; nready = 0; npending = 0; want_poll_cb = want_poll; done_poll_cb = done_poll; return 0; } X_THREAD_PROC (etp_proc); static void ecb_cold etp_start_thread (void) { etp_worker *wrk = calloc (1, sizeof (etp_worker)); /*TODO*/ assert (("unable to allocate worker thread data", wrk)); X_LOCK (wrklock); if (thread_create (&wrk->tid, etp_proc, (void *)wrk)) { wrk->prev = &wrk_first; wrk->next = wrk_first.next; wrk_first.next->prev = wrk; wrk_first.next = wrk; ++started; } else free (wrk); X_UNLOCK (wrklock); } static void etp_maybe_start_thread (void) { if (ecb_expect_true (etp_nthreads () >= wanted)) return; /* todo: maybe use idle here, but might be less exact */ if (ecb_expect_true (0 <= (int)etp_nthreads () + (int)etp_npending () - (int)etp_nreqs ())) return; etp_start_thread (); } static void ecb_cold etp_end_thread (void) { eio_req *req = calloc (1, sizeof (eio_req)); /* will be freed by worker */ req->type = -1; req->pri = ETP_PRI_MAX - ETP_PRI_MIN; X_LOCK (reqlock); reqq_push (&req_queue, req); X_COND_SIGNAL (reqwait); X_UNLOCK (reqlock); X_LOCK (wrklock); --started; X_UNLOCK (wrklock); } static int etp_poll (void) { unsigned int maxreqs; unsigned int maxtime; struct timeval tv_start, tv_now; X_LOCK (reslock); maxreqs = max_poll_reqs; maxtime = max_poll_time; X_UNLOCK (reslock); if (maxtime) gettimeofday (&tv_start, 0); for (;;) { ETP_REQ *req; etp_maybe_start_thread (); X_LOCK (reslock); req = reqq_shift (&res_queue); if (req) { --npending; if (!res_queue.size && done_poll_cb) done_poll_cb (); } X_UNLOCK (reslock); if (!req) return 0; X_LOCK (reqlock); --nreqs; X_UNLOCK (reqlock); if (ecb_expect_false (req->type == EIO_GROUP && req->size)) { req->int1 = 1; /* mark request as delayed */ continue; } else { int res = ETP_FINISH (req); if (ecb_expect_false (res)) return res; } if (ecb_expect_false (maxreqs && !--maxreqs)) break; if (maxtime) { gettimeofday (&tv_now, 0); if (tvdiff (&tv_start, &tv_now) >= maxtime) break; } } errno = EAGAIN; return -1; } static void etp_cancel (ETP_REQ *req) { req->cancelled = 1; eio_grp_cancel (req); } static void etp_submit (ETP_REQ *req) { req->pri -= ETP_PRI_MIN; if (ecb_expect_false (req->pri < ETP_PRI_MIN - ETP_PRI_MIN)) req->pri = ETP_PRI_MIN - ETP_PRI_MIN; if (ecb_expect_false (req->pri > ETP_PRI_MAX - ETP_PRI_MIN)) req->pri = ETP_PRI_MAX - ETP_PRI_MIN; if (ecb_expect_false (req->type == EIO_GROUP)) { /* I hope this is worth it :/ */ X_LOCK (reqlock); ++nreqs; X_UNLOCK (reqlock); X_LOCK (reslock); ++npending; if (!reqq_push (&res_queue, req) && want_poll_cb) want_poll_cb (); X_UNLOCK (reslock); } else { X_LOCK (reqlock); ++nreqs; ++nready; reqq_push (&req_queue, req); X_COND_SIGNAL (reqwait); X_UNLOCK (reqlock); etp_maybe_start_thread (); } } static void ecb_cold etp_set_max_poll_time (double nseconds) { if (WORDACCESS_UNSAFE) X_LOCK (reslock); max_poll_time = nseconds * EIO_TICKS; if (WORDACCESS_UNSAFE) X_UNLOCK (reslock); } static void ecb_cold etp_set_max_poll_reqs (unsigned int maxreqs) { if (WORDACCESS_UNSAFE) X_LOCK (reslock); max_poll_reqs = maxreqs; if (WORDACCESS_UNSAFE) X_UNLOCK (reslock); } static void ecb_cold etp_set_max_idle (unsigned int nthreads) { if (WORDACCESS_UNSAFE) X_LOCK (reqlock); max_idle = nthreads; if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock); } static void ecb_cold etp_set_idle_timeout (unsigned int seconds) { if (WORDACCESS_UNSAFE) X_LOCK (reqlock); idle_timeout = seconds; if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock); } static void ecb_cold etp_set_min_parallel (unsigned int nthreads) { if (wanted < nthreads) wanted = nthreads; } static void ecb_cold etp_set_max_parallel (unsigned int nthreads) { if (wanted > nthreads) wanted = nthreads; while (started > wanted) etp_end_thread (); } /*****************************************************************************/ static void grp_try_feed (eio_req *grp) { while (grp->size < grp->int2 && !EIO_CANCELLED (grp)) { grp->flags &= ~EIO_FLAG_GROUPADD; EIO_FEED (grp); /* stop if no progress has been made */ if (!(grp->flags & EIO_FLAG_GROUPADD)) { grp->feed = 0; break; } } } static int grp_dec (eio_req *grp) { --grp->size; /* call feeder, if applicable */ grp_try_feed (grp); /* finish, if done */ if (!grp->size && grp->int1) return eio_finish (grp); else return 0; } static void eio_destroy (eio_req *req) { if ((req)->flags & EIO_FLAG_PTR1_FREE) free (req->ptr1); if ((req)->flags & EIO_FLAG_PTR2_FREE) free (req->ptr2); EIO_DESTROY (req); } static int eio_finish (eio_req *req) { int res = EIO_FINISH (req); if (req->grp) { int res2; eio_req *grp = req->grp; /* unlink request */ if (req->grp_next) req->grp_next->grp_prev = req->grp_prev; if (req->grp_prev) req->grp_prev->grp_next = req->grp_next; if (grp->grp_first == req) grp->grp_first = req->grp_next; res2 = grp_dec (grp); if (!res) res = res2; } eio_destroy (req); return res; } void eio_grp_cancel (eio_req *grp) { for (grp = grp->grp_first; grp; grp = grp->grp_next) eio_cancel (grp); } void eio_cancel (eio_req *req) { etp_cancel (req); } void eio_submit (eio_req *req) { etp_submit (req); } unsigned int eio_nreqs (void) { return etp_nreqs (); } unsigned int eio_nready (void) { return etp_nready (); } unsigned int eio_npending (void) { return etp_npending (); } unsigned int ecb_cold eio_nthreads (void) { return etp_nthreads (); } void ecb_cold eio_set_max_poll_time (double nseconds) { etp_set_max_poll_time (nseconds); } void ecb_cold eio_set_max_poll_reqs (unsigned int maxreqs) { etp_set_max_poll_reqs (maxreqs); } void ecb_cold eio_set_max_idle (unsigned int nthreads) { etp_set_max_idle (nthreads); } void ecb_cold eio_set_idle_timeout (unsigned int seconds) { etp_set_idle_timeout (seconds); } void ecb_cold eio_set_min_parallel (unsigned int nthreads) { etp_set_min_parallel (nthreads); } void ecb_cold eio_set_max_parallel (unsigned int nthreads) { etp_set_max_parallel (nthreads); } int eio_poll (void) { return etp_poll (); } /*****************************************************************************/ /* work around various missing functions */ #if !HAVE_PREADWRITE # undef pread # undef pwrite # define pread eio__pread # define pwrite eio__pwrite static eio_ssize_t eio__pread (int fd, void *buf, size_t count, off_t offset) { eio_ssize_t res; off_t ooffset; X_LOCK (preadwritelock); ooffset = lseek (fd, 0, SEEK_CUR); lseek (fd, offset, SEEK_SET); res = read (fd, buf, count); lseek (fd, ooffset, SEEK_SET); X_UNLOCK (preadwritelock); return res; } static eio_ssize_t eio__pwrite (int fd, void *buf, size_t count, off_t offset) { eio_ssize_t res; off_t ooffset; X_LOCK (preadwritelock); ooffset = lseek (fd, 0, SEEK_CUR); lseek (fd, offset, SEEK_SET); res = write (fd, buf, count); lseek (fd, ooffset, SEEK_SET); X_UNLOCK (preadwritelock); return res; } #endif #ifndef HAVE_UTIMES #include # undef utimes # define utimes(path,times) eio__utimes (path, times) static int eio__utimes (const char *filename, const struct timeval times[2]) { if (times) { struct utimbuf buf; buf.actime = times[0].tv_sec; buf.modtime = times[1].tv_sec; return utime (filename, &buf); } else return utime (filename, 0); } #endif #ifndef HAVE_FUTIMES # undef futimes # define futimes(fd,times) eio__futimes (fd, times) static int eio__futimes (int fd, const struct timeval tv[2]) { errno = ENOSYS; return -1; } #endif #if !HAVE_FDATASYNC # undef fdatasync # define fdatasync(fd) fsync (fd) #endif static int eio__syncfs (int fd) { int res; #if HAVE_SYS_SYNCFS res = (int)syscall (__NR_syncfs, (int)(fd)); #else res = -1; errno = ENOSYS; #endif if (res < 0 && errno == ENOSYS && fd >= 0) sync (); return res; } /* sync_file_range always needs emulation */ static int eio__sync_file_range (int fd, off_t offset, size_t nbytes, unsigned int flags) { #if HAVE_SYNC_FILE_RANGE int res; if (EIO_SYNC_FILE_RANGE_WAIT_BEFORE != SYNC_FILE_RANGE_WAIT_BEFORE || EIO_SYNC_FILE_RANGE_WRITE != SYNC_FILE_RANGE_WRITE || EIO_SYNC_FILE_RANGE_WAIT_AFTER != SYNC_FILE_RANGE_WAIT_AFTER) { flags = 0 | (flags & EIO_SYNC_FILE_RANGE_WAIT_BEFORE ? SYNC_FILE_RANGE_WAIT_BEFORE : 0) | (flags & EIO_SYNC_FILE_RANGE_WRITE ? SYNC_FILE_RANGE_WRITE : 0) | (flags & EIO_SYNC_FILE_RANGE_WAIT_AFTER ? SYNC_FILE_RANGE_WAIT_AFTER : 0); } res = sync_file_range (fd, offset, nbytes, flags); if (!res || errno != ENOSYS) return res; #endif /* even though we could play tricks with the flags, it's better to always * call fdatasync, as that matches the expectation of its users best */ return fdatasync (fd); } static int eio__fallocate (int fd, int mode, off_t offset, size_t len) { #if HAVE_FALLOCATE return fallocate (fd, mode, offset, len); #else errno = ENOSYS; return -1; #endif } #if !HAVE_READAHEAD # undef readahead # define readahead(fd,offset,count) eio__readahead (fd, offset, count, self) static eio_ssize_t eio__readahead (int fd, off_t offset, size_t count, etp_worker *self) { size_t todo = count; dBUF; while (todo > 0) { size_t len = todo < EIO_BUFSIZE ? todo : EIO_BUFSIZE; pread (fd, eio_buf, len, offset); offset += len; todo -= len; } FUBd; errno = 0; return count; } #endif /* sendfile always needs emulation */ static eio_ssize_t eio__sendfile (int ofd, int ifd, off_t offset, size_t count) { eio_ssize_t written = 0; eio_ssize_t res; if (!count) return 0; for (;;) { #ifdef __APPLE__ # undef HAVE_SENDFILE /* broken, as everything on os x */ #endif #if HAVE_SENDFILE # if __linux off_t soffset = offset; res = sendfile (ofd, ifd, &soffset, count); # elif __FreeBSD__ /* * Of course, the freebsd sendfile is a dire hack with no thoughts * wasted on making it similar to other I/O functions. */ off_t sbytes; res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0); #if 0 /* according to the manpage, this is correct, but broken behaviour */ /* freebsd' sendfile will return 0 on success */ /* freebsd 8 documents it as only setting *sbytes on EINTR and EAGAIN, but */ /* not on e.g. EIO or EPIPE - sounds broken */ if ((res < 0 && (errno == EAGAIN || errno == EINTR) && sbytes) || res == 0) res = sbytes; #endif /* according to source inspection, this is correct, and useful behaviour */ if (sbytes) res = sbytes; # elif defined (__APPLE__) off_t sbytes = count; res = sendfile (ifd, ofd, offset, &sbytes, 0, 0); /* according to the manpage, sbytes is always valid */ if (sbytes) res = sbytes; # elif __hpux res = sendfile (ofd, ifd, offset, count, 0, 0); # elif __solaris struct sendfilevec vec; size_t sbytes; vec.sfv_fd = ifd; vec.sfv_flag = 0; vec.sfv_off = offset; vec.sfv_len = count; res = sendfilev (ofd, &vec, 1, &sbytes); if (res < 0 && sbytes) res = sbytes; # endif #elif defined (_WIN32) && 0 /* does not work, just for documentation of what would need to be done */ /* actually, cannot be done like this, as TransmitFile changes the file offset, */ /* libeio guarantees that the file offset does not change, and windows */ /* has no way to get an independent handle to the same file description */ HANDLE h = TO_SOCKET (ifd); SetFilePointer (h, offset, 0, FILE_BEGIN); res = TransmitFile (TO_SOCKET (ofd), h, count, 0, 0, 0, 0); #else res = -1; errno = ENOSYS; #endif /* we assume sendfile can copy at least 128mb in one go */ if (res <= 128 * 1024 * 1024) { if (res > 0) written += res; if (written) return written; break; } else { /* if we requested more, then probably the kernel was lazy */ written += res; offset += res; count -= res; if (!count) return written; } } if (res < 0 && (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK /* BSDs */ #ifdef ENOTSUP /* sigh, if the steenking pile called openbsd would only try to at least compile posix code... */ || errno == ENOTSUP #endif #ifdef EOPNOTSUPP /* windows */ || errno == EOPNOTSUPP /* BSDs */ #endif #if __solaris || errno == EAFNOSUPPORT || errno == EPROTOTYPE #endif ) ) { /* emulate sendfile. this is a major pain in the ass */ dBUF; res = 0; while (count) { eio_ssize_t cnt; cnt = pread (ifd, eio_buf, count > EIO_BUFSIZE ? EIO_BUFSIZE : count, offset); if (cnt <= 0) { if (cnt && !res) res = -1; break; } cnt = write (ofd, eio_buf, cnt); if (cnt <= 0) { if (cnt && !res) res = -1; break; } offset += cnt; res += cnt; count -= cnt; } FUBd; } return res; } #ifdef PAGESIZE # define eio_pagesize() PAGESIZE #else static intptr_t eio_pagesize (void) { static intptr_t page; if (!page) page = sysconf (_SC_PAGESIZE); return page; } #endif static void eio_page_align (void **addr, size_t *length) { intptr_t mask = eio_pagesize () - 1; /* round down addr */ intptr_t adj = mask & (intptr_t)*addr; *addr = (void *)((intptr_t)*addr - adj); *length += adj; /* round up length */ *length = (*length + mask) & ~mask; } #if !_POSIX_MEMLOCK # define eio__mlockall(a) EIO_ENOSYS () #else static int eio__mlockall (int flags) { #if __GLIBC__ == 2 && __GLIBC_MINOR__ <= 7 extern int mallopt (int, int); mallopt (-6, 238); /* http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=473812 */ #endif if (EIO_MCL_CURRENT != MCL_CURRENT || EIO_MCL_FUTURE != MCL_FUTURE) { flags = 0 | (flags & EIO_MCL_CURRENT ? MCL_CURRENT : 0) | (flags & EIO_MCL_FUTURE ? MCL_FUTURE : 0); } return mlockall (flags); } #endif #if !_POSIX_MEMLOCK_RANGE # define eio__mlock(a,b) EIO_ENOSYS () #else static int eio__mlock (void *addr, size_t length) { eio_page_align (&addr, &length); return mlock (addr, length); } #endif #if !(_POSIX_MAPPED_FILES && _POSIX_SYNCHRONIZED_IO) # define eio__msync(a,b,c) EIO_ENOSYS () #else static int eio__msync (void *mem, size_t len, int flags) { eio_page_align (&mem, &len); if (EIO_MS_ASYNC != MS_SYNC || EIO_MS_INVALIDATE != MS_INVALIDATE || EIO_MS_SYNC != MS_SYNC) { flags = 0 | (flags & EIO_MS_ASYNC ? MS_ASYNC : 0) | (flags & EIO_MS_INVALIDATE ? MS_INVALIDATE : 0) | (flags & EIO_MS_SYNC ? MS_SYNC : 0); } return msync (mem, len, flags); } #endif static int eio__mtouch (eio_req *req) { void *mem = req->ptr2; size_t len = req->size; int flags = req->int1; eio_page_align (&mem, &len); { intptr_t addr = (intptr_t)mem; intptr_t end = addr + len; intptr_t page = eio_pagesize (); if (addr < end) if (flags & EIO_MT_MODIFY) /* modify */ do { *((volatile sig_atomic_t *)addr) |= 0; } while ((addr += page) < len && !EIO_CANCELLED (req)); else do { *((volatile sig_atomic_t *)addr) ; } while ((addr += page) < len && !EIO_CANCELLED (req)); } return 0; } /*****************************************************************************/ /* requests implemented outside eio_execute, because they are so large */ /* result will always end up in tmpbuf, there is always space for adding a 0-byte */ static int eio__realpath (struct tmpbuf *tmpbuf, eio_wd wd, const char *path) { const char *rel = path; char *res; char *tmp1, *tmp2; #if SYMLOOP_MAX > 32 int symlinks = SYMLOOP_MAX; #else int symlinks = 32; #endif errno = EINVAL; if (!rel) return -1; errno = ENOENT; if (!*rel) return -1; res = tmpbuf_get (tmpbuf, PATH_MAX * 3); tmp1 = res + PATH_MAX; tmp2 = tmp1 + PATH_MAX; #if 0 /* disabled, the musl way to do things is just too racy */ #if __linux && defined(O_NONBLOCK) && defined(O_NOATIME) /* on linux we may be able to ask the kernel */ { int fd = open (rel, O_RDONLY | O_NONBLOCK | O_NOCTTY | O_NOATIME); if (fd >= 0) { sprintf (tmp1, "/proc/self/fd/%d", fd); req->result = readlink (tmp1, res, PATH_MAX); close (fd); /* here we should probably stat the open file and the disk file, to make sure they still match */ if (req->result > 0) goto done; } else if (errno == ELOOP || errno == ENAMETOOLONG || errno == ENOENT || errno == ENOTDIR || errno == EIO) return; } #endif #endif if (*rel != '/') { int len; errno = ENOENT; if (wd == EIO_INVALID_WD) return -1; if (wd == EIO_CWD) { if (!getcwd (res, PATH_MAX)) return -1; len = strlen (res); } else memcpy (res, wd->str, len = wd->len); if (res [1]) /* only use if not / */ res += len; } while (*rel) { eio_ssize_t len, linklen; const char *beg = rel; while (*rel && *rel != '/') ++rel; len = rel - beg; if (!len) /* skip slashes */ { ++rel; continue; } if (beg [0] == '.') { if (len == 1) continue; /* . - nop */ if (beg [1] == '.' && len == 2) { /* .. - back up one component, if possible */ while (res != tmpbuf->ptr) if (*--res == '/') break; continue; } } errno = ENAMETOOLONG; if (res + 1 + len + 1 >= tmp1) return -1; /* copy one component */ *res = '/'; memcpy (res + 1, beg, len); /* zero-terminate, for readlink */ res [len + 1] = 0; /* now check if it's a symlink */ linklen = readlink (tmpbuf->ptr, tmp1, PATH_MAX); if (linklen < 0) { if (errno != EINVAL) return -1; /* it's a normal directory. hopefully */ res += len + 1; } else { /* yay, it was a symlink - build new path in tmp2 */ int rellen = strlen (rel); errno = ENAMETOOLONG; if (linklen + 1 + rellen >= PATH_MAX) return -1; errno = ELOOP; if (!--symlinks) return -1; if (*tmp1 == '/') res = tmpbuf->ptr; /* symlink resolves to an absolute path */ /* we need to be careful, as rel might point into tmp2 already */ memmove (tmp2 + linklen + 1, rel, rellen + 1); tmp2 [linklen] = '/'; memcpy (tmp2, tmp1, linklen); rel = tmp2; } } /* special case for the lone root path */ if (res == tmpbuf->ptr) *res++ = '/'; return res - (char *)tmpbuf->ptr; } static signed char eio_dent_cmp (const eio_dirent *a, const eio_dirent *b) { return a->score - b->score ? a->score - b->score /* works because our signed char is always 0..100 */ : a->inode < b->inode ? -1 : a->inode > b->inode ? 1 : 0; } #define EIO_DENT_CMP(i,op,j) eio_dent_cmp (&i, &j) op 0 #define EIO_SORT_CUTOFF 30 /* quite high, but performs well on many filesystems */ #define EIO_SORT_FAST 60 /* when to only use insertion sort */ static void eio_dent_radix_sort (eio_dirent *dents, int size, signed char score_bits, eio_ino_t inode_bits) { unsigned char bits [9 + sizeof (eio_ino_t) * 8]; unsigned char *bit = bits; assert (CHAR_BIT == 8); assert (sizeof (eio_dirent) * 8 < 256); assert (offsetof (eio_dirent, inode)); /* we use bit #0 as sentinel */ assert (offsetof (eio_dirent, score)); /* we use bit #0 as sentinel */ if (size <= EIO_SORT_FAST) return; /* first prepare an array of bits to test in our radix sort */ /* try to take endianness into account, as well as differences in eio_ino_t sizes */ /* inode_bits must contain all inodes ORed together */ /* which is used to skip bits that are 0 everywhere, which is very common */ { eio_ino_t endianness; int i, j; /* we store the byte offset of byte n into byte n of "endianness" */ for (i = 0; i < sizeof (eio_ino_t); ++i) ((unsigned char *)&endianness)[i] = i; *bit++ = 0; for (i = 0; i < sizeof (eio_ino_t); ++i) { /* shifting off the byte offsets out of "endianness" */ int offs = (offsetof (eio_dirent, inode) + (endianness & 0xff)) * 8; endianness >>= 8; for (j = 0; j < 8; ++j) if (inode_bits & (((eio_ino_t)1) << (i * 8 + j))) *bit++ = offs + j; } for (j = 0; j < 8; ++j) if (score_bits & (1 << j)) *bit++ = offsetof (eio_dirent, score) * 8 + j; } /* now actually do the sorting (a variant of MSD radix sort) */ { eio_dirent *base_stk [9 + sizeof (eio_ino_t) * 8], *base; eio_dirent *end_stk [9 + sizeof (eio_ino_t) * 8], *end; unsigned char *bit_stk [9 + sizeof (eio_ino_t) * 8]; int stk_idx = 0; base_stk [stk_idx] = dents; end_stk [stk_idx] = dents + size; bit_stk [stk_idx] = bit - 1; do { base = base_stk [stk_idx]; end = end_stk [stk_idx]; bit = bit_stk [stk_idx]; for (;;) { unsigned char O = *bit >> 3; unsigned char M = 1 << (*bit & 7); eio_dirent *a = base; eio_dirent *b = end; if (b - a < EIO_SORT_CUTOFF) break; /* now bit-partition the array on the bit */ /* this ugly asymmetric loop seems to perform much better than typical */ /* partition algos found in the literature */ do if (!(((unsigned char *)a)[O] & M)) ++a; else if (!(((unsigned char *)--b)[O] & M)) { eio_dirent tmp = *a; *a = *b; *b = tmp; ++a; } while (b > a); /* next bit, or stop, if no bits left in this path */ if (!*--bit) break; base_stk [stk_idx] = a; end_stk [stk_idx] = end; bit_stk [stk_idx] = bit; ++stk_idx; end = a; } } while (stk_idx--); } } static void eio_dent_insertion_sort (eio_dirent *dents, int size) { /* first move the smallest element to the front, to act as a sentinel */ { int i; eio_dirent *min = dents; /* the radix pre-pass ensures that the minimum element is in the first EIO_SORT_CUTOFF + 1 elements */ for (i = size > EIO_SORT_FAST ? EIO_SORT_CUTOFF + 1 : size; --i; ) if (EIO_DENT_CMP (dents [i], <, *min)) min = &dents [i]; /* swap elements 0 and j (minimum) */ { eio_dirent tmp = *dents; *dents = *min; *min = tmp; } } /* then do standard insertion sort, assuming that all elements are >= dents [0] */ { eio_dirent *i, *j; for (i = dents + 1; i < dents + size; ++i) { eio_dirent value = *i; for (j = i - 1; EIO_DENT_CMP (*j, >, value); --j) j [1] = j [0]; j [1] = value; } } } static void eio_dent_sort (eio_dirent *dents, int size, signed char score_bits, eio_ino_t inode_bits) { if (size <= 1) return; /* our insertion sort relies on size > 0 */ /* first we use a radix sort, but only for dirs >= EIO_SORT_FAST */ /* and stop sorting when the partitions are <= EIO_SORT_CUTOFF */ eio_dent_radix_sort (dents, size, score_bits, inode_bits); /* use an insertion sort at the end, or for small arrays, */ /* as insertion sort is more efficient for small partitions */ eio_dent_insertion_sort (dents, size); } /* read a full directory */ static void eio__scandir (eio_req *req, etp_worker *self) { char *name, *names; int namesalloc = 4096 - sizeof (void *) * 4; int namesoffs = 0; int flags = req->int1; eio_dirent *dents = 0; int dentalloc = 128; int dentoffs = 0; eio_ino_t inode_bits = 0; #ifdef _WIN32 HANDLE dirp; WIN32_FIND_DATA entp; #else DIR *dirp; EIO_STRUCT_DIRENT *entp; #endif req->result = -1; if (!(flags & EIO_READDIR_DENTS)) flags &= ~(EIO_READDIR_DIRS_FIRST | EIO_READDIR_STAT_ORDER); #ifdef _WIN32 { int len = strlen ((const char *)req->ptr1); char *path = malloc (MAX_PATH); const char *fmt; const char *reqpath = wd_expand (&self->tmpbuf, req->wd, req->ptr1); if (!len) fmt = "./*"; else if (reqpath[len - 1] == '/' || reqpath[len - 1] == '\\') fmt = "%s*"; else fmt = "%s/*"; _snprintf (path, MAX_PATH, fmt, reqpath); dirp = FindFirstFile (path, &entp); free (path); if (dirp == INVALID_HANDLE_VALUE) { /* should steal _dosmaperr */ switch (GetLastError ()) { case ERROR_FILE_NOT_FOUND: req->result = 0; break; case ERROR_INVALID_NAME: case ERROR_PATH_NOT_FOUND: case ERROR_NO_MORE_FILES: errno = ENOENT; break; case ERROR_NOT_ENOUGH_MEMORY: errno = ENOMEM; break; default: errno = EINVAL; break; } return; } } #else #if HAVE_AT if (req->wd) { int fd = openat (WD2FD (req->wd), req->ptr1, O_CLOEXEC | O_SEARCH | O_DIRECTORY); if (fd < 0) return; dirp = fdopendir (fd); if (!dirp) close (fd); } else dirp = opendir (req->ptr1); #else dirp = opendir (wd_expand (&self->tmpbuf, req->wd, req->ptr1)); #endif if (!dirp) return; #endif if (req->flags & EIO_FLAG_PTR1_FREE) free (req->ptr1); req->flags |= EIO_FLAG_PTR1_FREE | EIO_FLAG_PTR2_FREE; req->ptr1 = dents = flags ? malloc (dentalloc * sizeof (eio_dirent)) : 0; req->ptr2 = names = malloc (namesalloc); if (!names || (flags && !dents)) return; for (;;) { int done; #ifdef _WIN32 done = !dirp; #else errno = 0; entp = readdir (dirp); done = !entp; #endif if (done) { #ifndef _WIN32 int old_errno = errno; closedir (dirp); errno = old_errno; if (errno) break; #endif /* sort etc. */ req->int1 = flags; req->result = dentoffs; if (flags & EIO_READDIR_STAT_ORDER) eio_dent_sort (dents, dentoffs, flags & EIO_READDIR_DIRS_FIRST ? 7 : 0, inode_bits); else if (flags & EIO_READDIR_DIRS_FIRST) if (flags & EIO_READDIR_FOUND_UNKNOWN) eio_dent_sort (dents, dentoffs, 7, inode_bits); /* sort by score and inode */ else { /* in this case, all is known, and we just put dirs first and sort them */ eio_dirent *oth = dents + dentoffs; eio_dirent *dir = dents; /* now partition dirs to the front, and non-dirs to the back */ /* by walking from both sides and swapping if necessary */ while (oth > dir) { if (dir->type == EIO_DT_DIR) ++dir; else if ((--oth)->type == EIO_DT_DIR) { eio_dirent tmp = *dir; *dir = *oth; *oth = tmp; ++dir; } } /* now sort the dirs only (dirs all have the same score) */ eio_dent_sort (dents, dir - dents, 0, inode_bits); } break; } /* now add the entry to our list(s) */ name = D_NAME (entp); /* skip . and .. entries */ if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2]))) { int len = D_NAMLEN (entp) + 1; while (ecb_expect_false (namesoffs + len > namesalloc)) { namesalloc *= 2; req->ptr2 = names = realloc (names, namesalloc); if (!names) break; } memcpy (names + namesoffs, name, len); if (dents) { struct eio_dirent *ent; if (ecb_expect_false (dentoffs == dentalloc)) { dentalloc *= 2; req->ptr1 = dents = realloc (dents, dentalloc * sizeof (eio_dirent)); if (!dents) break; } ent = dents + dentoffs; ent->nameofs = namesoffs; /* rather dirtily we store the offset in the pointer */ ent->namelen = len - 1; ent->inode = D_INO (entp); inode_bits |= ent->inode; switch (D_TYPE (entp)) { default: ent->type = EIO_DT_UNKNOWN; flags |= EIO_READDIR_FOUND_UNKNOWN; break; #ifdef DT_FIFO case DT_FIFO: ent->type = EIO_DT_FIFO; break; #endif #ifdef DT_CHR case DT_CHR: ent->type = EIO_DT_CHR; break; #endif #ifdef DT_MPC case DT_MPC: ent->type = EIO_DT_MPC; break; #endif #ifdef DT_DIR case DT_DIR: ent->type = EIO_DT_DIR; break; #endif #ifdef DT_NAM case DT_NAM: ent->type = EIO_DT_NAM; break; #endif #ifdef DT_BLK case DT_BLK: ent->type = EIO_DT_BLK; break; #endif #ifdef DT_MPB case DT_MPB: ent->type = EIO_DT_MPB; break; #endif #ifdef DT_REG case DT_REG: ent->type = EIO_DT_REG; break; #endif #ifdef DT_NWK case DT_NWK: ent->type = EIO_DT_NWK; break; #endif #ifdef DT_CMP case DT_CMP: ent->type = EIO_DT_CMP; break; #endif #ifdef DT_LNK case DT_LNK: ent->type = EIO_DT_LNK; break; #endif #ifdef DT_SOCK case DT_SOCK: ent->type = EIO_DT_SOCK; break; #endif #ifdef DT_DOOR case DT_DOOR: ent->type = EIO_DT_DOOR; break; #endif #ifdef DT_WHT case DT_WHT: ent->type = EIO_DT_WHT; break; #endif } ent->score = 7; if (flags & EIO_READDIR_DIRS_FIRST) { if (ent->type == EIO_DT_UNKNOWN) { if (*name == '.') /* leading dots are likely directories, and, in any case, rare */ ent->score = 1; else if (!strchr (name, '.')) /* absense of dots indicate likely dirs */ ent->score = len <= 2 ? 4 - len : len <= 4 ? 4 : len <= 7 ? 5 : 6; /* shorter == more likely dir, but avoid too many classes */ } else if (ent->type == EIO_DT_DIR) ent->score = 0; } } namesoffs += len; ++dentoffs; } if (EIO_CANCELLED (req)) { errno = ECANCELED; break; } #ifdef _WIN32 if (!FindNextFile (dirp, &entp)) { FindClose (dirp); dirp = 0; } #endif } } /*****************************************************************************/ /* working directory stuff */ /* various deficiencies in the posix 2008 api force us to */ /* keep the absolute path in string form at all times */ /* fuck yeah. */ #if !HAVE_AT /* a bit like realpath, but usually faster because it doesn'T have to return */ /* an absolute or canonical path */ static const char * wd_expand (struct tmpbuf *tmpbuf, eio_wd wd, const char *path) { if (!wd || *path == '/') return path; if (path [0] == '.' && !path [1]) return wd->str; { int l1 = wd->len; int l2 = strlen (path); char *res = tmpbuf_get (tmpbuf, l1 + l2 + 2); memcpy (res, wd->str, l1); res [l1] = '/'; memcpy (res + l1 + 1, path, l2 + 1); return res; } } #endif static eio_wd eio__wd_open_sync (struct tmpbuf *tmpbuf, eio_wd wd, const char *path) { int fd; eio_wd res; int len = eio__realpath (tmpbuf, wd, path); if (len < 0) return EIO_INVALID_WD; #if HAVE_AT fd = openat (WD2FD (wd), path, O_CLOEXEC | O_SEARCH | O_DIRECTORY); if (fd < 0) return EIO_INVALID_WD; #endif res = malloc (sizeof (*res) + len); /* one extra 0-byte */ #if HAVE_AT res->fd = fd; #endif res->len = len; memcpy (res->str, tmpbuf->ptr, len); res->str [len] = 0; return res; } eio_wd eio_wd_open_sync (eio_wd wd, const char *path) { struct tmpbuf tmpbuf = { 0 }; wd = eio__wd_open_sync (&tmpbuf, wd, path); free (tmpbuf.ptr); return wd; } void eio_wd_close_sync (eio_wd wd) { if (wd != EIO_INVALID_WD && wd != EIO_CWD) { #if HAVE_AT close (wd->fd); #endif free (wd); } } #if HAVE_AT /* they forgot these */ static int eio__truncateat (int dirfd, const char *path, off_t length) { int fd = openat (dirfd, path, O_WRONLY | O_CLOEXEC); int res; if (fd < 0) return fd; res = ftruncate (fd, length); close (fd); return res; } static int eio__statvfsat (int dirfd, const char *path, struct statvfs *buf) { int fd = openat (dirfd, path, O_SEARCH | O_CLOEXEC); int res; if (fd < 0) return fd; res = fstatvfs (fd, buf); close (fd); return res; } #endif /*****************************************************************************/ #define ALLOC(len) \ if (!req->ptr2) \ { \ X_LOCK (wrklock); \ req->flags |= EIO_FLAG_PTR2_FREE; \ X_UNLOCK (wrklock); \ req->ptr2 = malloc (len); \ if (!req->ptr2) \ { \ errno = ENOMEM; \ req->result = -1; \ break; \ } \ } static void ecb_noinline ecb_cold etp_proc_init (void) { #if HAVE_PRCTL_SET_NAME /* provide a more sensible "thread name" */ char name[16 + 1]; const int namelen = sizeof (name) - 1; int len; prctl (PR_GET_NAME, (unsigned long)name, 0, 0, 0); name [namelen] = 0; len = strlen (name); strcpy (name + (len <= namelen - 4 ? len : namelen - 4), "/eio"); prctl (PR_SET_NAME, (unsigned long)name, 0, 0, 0); #endif } X_THREAD_PROC (etp_proc) { ETP_REQ *req; struct timespec ts; etp_worker *self = (etp_worker *)thr_arg; etp_proc_init (); /* try to distribute timeouts somewhat evenly */ ts.tv_nsec = ((unsigned long)self & 1023UL) * (1000000000UL / 1024UL); for (;;) { ts.tv_sec = 0; X_LOCK (reqlock); for (;;) { req = reqq_shift (&req_queue); if (req) break; if (ts.tv_sec == 1) /* no request, but timeout detected, let's quit */ { X_UNLOCK (reqlock); X_LOCK (wrklock); --started; X_UNLOCK (wrklock); goto quit; } ++idle; if (idle <= max_idle) /* we are allowed to idle, so do so without any timeout */ X_COND_WAIT (reqwait, reqlock); else { /* initialise timeout once */ if (!ts.tv_sec) ts.tv_sec = time (0) + idle_timeout; if (X_COND_TIMEDWAIT (reqwait, reqlock, ts) == ETIMEDOUT) ts.tv_sec = 1; /* assuming this is not a value computed above.,.. */ } --idle; } --nready; X_UNLOCK (reqlock); if (req->type < 0) goto quit; ETP_EXECUTE (self, req); X_LOCK (reslock); ++npending; if (!reqq_push (&res_queue, req) && want_poll_cb) want_poll_cb (); etp_worker_clear (self); X_UNLOCK (reslock); } quit: free (req); X_LOCK (wrklock); etp_worker_free (self); X_UNLOCK (wrklock); return 0; } /*****************************************************************************/ int ecb_cold eio_init (void (*want_poll)(void), void (*done_poll)(void)) { #if !HAVE_PREADWRITE X_MUTEX_CREATE (preadwritelock); #endif return etp_init (want_poll, done_poll); } ecb_inline void eio_api_destroy (eio_req *req) { free (req); } #define REQ(rtype) \ eio_req *req; \ \ req = (eio_req *)calloc (1, sizeof *req); \ if (!req) \ return 0; \ \ req->type = rtype; \ req->pri = pri; \ req->finish = cb; \ req->data = data; \ req->destroy = eio_api_destroy; #define SEND eio_submit (req); return req #define PATH \ req->flags |= EIO_FLAG_PTR1_FREE; \ req->ptr1 = strdup (path); \ if (!req->ptr1) \ { \ eio_api_destroy (req); \ return 0; \ } static void eio_execute (etp_worker *self, eio_req *req) { #if HAVE_AT int dirfd; #else const char *path; #endif if (ecb_expect_false (EIO_CANCELLED (req))) { req->result = -1; req->errorno = ECANCELED; return; } if (ecb_expect_false (req->wd == EIO_INVALID_WD)) { req->result = -1; req->errorno = ENOENT; return; } if (req->type >= EIO_OPEN) { #if HAVE_AT dirfd = WD2FD (req->wd); #else path = wd_expand (&self->tmpbuf, req->wd, req->ptr1); #endif } switch (req->type) { case EIO_WD_OPEN: req->wd = eio__wd_open_sync (&self->tmpbuf, req->wd, req->ptr1); req->result = req->wd == EIO_INVALID_WD ? -1 : 0; break; case EIO_WD_CLOSE: req->result = 0; eio_wd_close_sync (req->wd); break; case EIO_READ: ALLOC (req->size); req->result = req->offs >= 0 ? pread (req->int1, req->ptr2, req->size, req->offs) : read (req->int1, req->ptr2, req->size); break; case EIO_WRITE: req->result = req->offs >= 0 ? pwrite (req->int1, req->ptr2, req->size, req->offs) : write (req->int1, req->ptr2, req->size); break; case EIO_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break; case EIO_SENDFILE: req->result = eio__sendfile (req->int1, req->int2, req->offs, req->size); break; #if HAVE_AT case EIO_STAT: ALLOC (sizeof (EIO_STRUCT_STAT)); req->result = fstatat (dirfd, req->ptr1, (EIO_STRUCT_STAT *)req->ptr2, 0); break; case EIO_LSTAT: ALLOC (sizeof (EIO_STRUCT_STAT)); req->result = fstatat (dirfd, req->ptr1, (EIO_STRUCT_STAT *)req->ptr2, AT_SYMLINK_NOFOLLOW); break; case EIO_CHOWN: req->result = fchownat (dirfd, req->ptr1, req->int2, req->int3, 0); break; case EIO_CHMOD: req->result = fchmodat (dirfd, req->ptr1, (mode_t)req->int2, 0); break; case EIO_TRUNCATE: req->result = eio__truncateat (dirfd, req->ptr1, req->offs); break; case EIO_OPEN: req->result = openat (dirfd, req->ptr1, req->int1, (mode_t)req->int2); break; case EIO_UNLINK: req->result = unlinkat (dirfd, req->ptr1, 0); break; case EIO_RMDIR: req->result = unlinkat (dirfd, req->ptr1, AT_REMOVEDIR); break; case EIO_MKDIR: req->result = mkdirat (dirfd, req->ptr1, (mode_t)req->int2); break; case EIO_RENAME: req->result = renameat (dirfd, req->ptr1, WD2FD ((eio_wd)req->int3), req->ptr2); break; case EIO_LINK: req->result = linkat (dirfd, req->ptr1, WD2FD ((eio_wd)req->int3), req->ptr2, 0); break; case EIO_SYMLINK: req->result = symlinkat (req->ptr1, dirfd, req->ptr2); break; case EIO_MKNOD: req->result = mknodat (dirfd, req->ptr1, (mode_t)req->int2, (dev_t)req->offs); break; case EIO_READLINK: ALLOC (PATH_MAX); req->result = readlinkat (dirfd, req->ptr1, req->ptr2, PATH_MAX); break; case EIO_STATVFS: ALLOC (sizeof (EIO_STRUCT_STATVFS)); req->result = eio__statvfsat (dirfd, req->ptr1, (EIO_STRUCT_STATVFS *)req->ptr2); break; case EIO_UTIME: case EIO_FUTIME: { struct timespec ts[2]; struct timespec *times; if (req->nv1 != -1. || req->nv2 != -1.) { ts[0].tv_sec = req->nv1; ts[0].tv_nsec = (req->nv1 - ts[0].tv_sec) * 1e9; ts[1].tv_sec = req->nv2; ts[1].tv_nsec = (req->nv2 - ts[1].tv_sec) * 1e9; times = ts; } else times = 0; req->result = req->type == EIO_FUTIME ? futimens (req->int1, times) : utimensat (dirfd, req->ptr1, times, 0); } break; #else case EIO_STAT: ALLOC (sizeof (EIO_STRUCT_STAT)); req->result = stat (path , (EIO_STRUCT_STAT *)req->ptr2); break; case EIO_LSTAT: ALLOC (sizeof (EIO_STRUCT_STAT)); req->result = lstat (path , (EIO_STRUCT_STAT *)req->ptr2); break; case EIO_CHOWN: req->result = chown (path , req->int2, req->int3); break; case EIO_CHMOD: req->result = chmod (path , (mode_t)req->int2); break; case EIO_TRUNCATE: req->result = truncate (path , req->offs); break; case EIO_OPEN: req->result = open (path , req->int1, (mode_t)req->int2); break; case EIO_UNLINK: req->result = unlink (path ); break; case EIO_RMDIR: req->result = rmdir (path ); break; case EIO_MKDIR: req->result = mkdir (path , (mode_t)req->int2); break; case EIO_RENAME: req->result = rename (path , req->ptr2); break; case EIO_LINK: req->result = link (path , req->ptr2); break; case EIO_SYMLINK: req->result = symlink (path , req->ptr2); break; case EIO_MKNOD: req->result = mknod (path , (mode_t)req->int2, (dev_t)req->offs); break; case EIO_READLINK: ALLOC (PATH_MAX); req->result = readlink (path, req->ptr2, PATH_MAX); break; case EIO_STATVFS: ALLOC (sizeof (EIO_STRUCT_STATVFS)); req->result = statvfs (path , (EIO_STRUCT_STATVFS *)req->ptr2); break; case EIO_UTIME: case EIO_FUTIME: { struct timeval tv[2]; struct timeval *times; if (req->nv1 != -1. || req->nv2 != -1.) { tv[0].tv_sec = req->nv1; tv[0].tv_usec = (req->nv1 - tv[0].tv_sec) * 1e6; tv[1].tv_sec = req->nv2; tv[1].tv_usec = (req->nv2 - tv[1].tv_sec) * 1e6; times = tv; } else times = 0; req->result = req->type == EIO_FUTIME ? futimes (req->int1, times) : utimes (req->ptr1, times); } break; #endif case EIO_REALPATH: if (0 <= (req->result = eio__realpath (&self->tmpbuf, req->wd, req->ptr1))) { ALLOC (req->result); memcpy (req->ptr2, self->tmpbuf.ptr, req->result); } break; case EIO_FSTAT: ALLOC (sizeof (EIO_STRUCT_STAT)); req->result = fstat (req->int1, (EIO_STRUCT_STAT *)req->ptr2); break; case EIO_FSTATVFS: ALLOC (sizeof (EIO_STRUCT_STATVFS)); req->result = fstatvfs (req->int1, (EIO_STRUCT_STATVFS *)req->ptr2); break; case EIO_FCHOWN: req->result = fchown (req->int1, req->int2, req->int3); break; case EIO_FCHMOD: req->result = fchmod (req->int1, (mode_t)req->int2); break; case EIO_FTRUNCATE: req->result = ftruncate (req->int1, req->offs); break; case EIO_CLOSE: req->result = close (req->int1); break; case EIO_DUP2: req->result = dup2 (req->int1, req->int2); break; case EIO_SYNC: req->result = 0; sync (); break; case EIO_FSYNC: req->result = fsync (req->int1); break; case EIO_FDATASYNC: req->result = fdatasync (req->int1); break; case EIO_SYNCFS: req->result = eio__syncfs (req->int1); break; case EIO_SYNC_FILE_RANGE: req->result = eio__sync_file_range (req->int1, req->offs, req->size, req->int2); break; case EIO_MSYNC: req->result = eio__msync (req->ptr2, req->size, req->int1); break; case EIO_MTOUCH: req->result = eio__mtouch (req); break; case EIO_MLOCK: req->result = eio__mlock (req->ptr2, req->size); break; case EIO_MLOCKALL: req->result = eio__mlockall (req->int1); break; case EIO_FALLOCATE: req->result = eio__fallocate (req->int1, req->int2, req->offs, req->size); break; case EIO_READDIR: eio__scandir (req, self); break; case EIO_BUSY: #ifdef _WIN32 Sleep (req->nv1 * 1e3); #else { struct timeval tv; tv.tv_sec = req->nv1; tv.tv_usec = (req->nv1 - tv.tv_sec) * 1e6; req->result = select (0, 0, 0, 0, &tv); } #endif break; case EIO_GROUP: abort (); /* handled in eio_request */ case EIO_NOP: req->result = 0; break; case EIO_CUSTOM: req->feed (req); break; default: errno = ENOSYS; req->result = -1; break; } req->errorno = errno; } #ifndef EIO_NO_WRAPPERS eio_req *eio_wd_open (const char *path, int pri, eio_cb cb, void *data) { REQ (EIO_WD_OPEN); PATH; SEND; } eio_req *eio_wd_close (eio_wd wd, int pri, eio_cb cb, void *data) { REQ (EIO_WD_CLOSE); req->wd = wd; SEND; } eio_req *eio_nop (int pri, eio_cb cb, void *data) { REQ (EIO_NOP); SEND; } eio_req *eio_busy (double delay, int pri, eio_cb cb, void *data) { REQ (EIO_BUSY); req->nv1 = delay; SEND; } eio_req *eio_sync (int pri, eio_cb cb, void *data) { REQ (EIO_SYNC); SEND; } eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data) { REQ (EIO_FSYNC); req->int1 = fd; SEND; } eio_req *eio_msync (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data) { REQ (EIO_MSYNC); req->ptr2 = addr; req->size = length; req->int1 = flags; SEND; } eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data) { REQ (EIO_FDATASYNC); req->int1 = fd; SEND; } eio_req *eio_syncfs (int fd, int pri, eio_cb cb, void *data) { REQ (EIO_SYNCFS); req->int1 = fd; SEND; } eio_req *eio_sync_file_range (int fd, off_t offset, size_t nbytes, unsigned int flags, int pri, eio_cb cb, void *data) { REQ (EIO_SYNC_FILE_RANGE); req->int1 = fd; req->offs = offset; req->size = nbytes; req->int2 = flags; SEND; } eio_req *eio_mtouch (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data) { REQ (EIO_MTOUCH); req->ptr2 = addr; req->size = length; req->int1 = flags; SEND; } eio_req *eio_mlock (void *addr, size_t length, int pri, eio_cb cb, void *data) { REQ (EIO_MLOCK); req->ptr2 = addr; req->size = length; SEND; } eio_req *eio_mlockall (int flags, int pri, eio_cb cb, void *data) { REQ (EIO_MLOCKALL); req->int1 = flags; SEND; } eio_req *eio_fallocate (int fd, int mode, off_t offset, size_t len, int pri, eio_cb cb, void *data) { REQ (EIO_FALLOCATE); req->int1 = fd; req->int2 = mode; req->offs = offset; req->size = len; SEND; } eio_req *eio_close (int fd, int pri, eio_cb cb, void *data) { REQ (EIO_CLOSE); req->int1 = fd; SEND; } eio_req *eio_readahead (int fd, off_t offset, size_t length, int pri, eio_cb cb, void *data) { REQ (EIO_READAHEAD); req->int1 = fd; req->offs = offset; req->size = length; SEND; } eio_req *eio_read (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data) { REQ (EIO_READ); req->int1 = fd; req->offs = offset; req->size = length; req->ptr2 = buf; SEND; } eio_req *eio_write (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data) { REQ (EIO_WRITE); req->int1 = fd; req->offs = offset; req->size = length; req->ptr2 = buf; SEND; } eio_req *eio_fstat (int fd, int pri, eio_cb cb, void *data) { REQ (EIO_FSTAT); req->int1 = fd; SEND; } eio_req *eio_fstatvfs (int fd, int pri, eio_cb cb, void *data) { REQ (EIO_FSTATVFS); req->int1 = fd; SEND; } eio_req *eio_futime (int fd, double atime, double mtime, int pri, eio_cb cb, void *data) { REQ (EIO_FUTIME); req->int1 = fd; req->nv1 = atime; req->nv2 = mtime; SEND; } eio_req *eio_ftruncate (int fd, off_t offset, int pri, eio_cb cb, void *data) { REQ (EIO_FTRUNCATE); req->int1 = fd; req->offs = offset; SEND; } eio_req *eio_fchmod (int fd, mode_t mode, int pri, eio_cb cb, void *data) { REQ (EIO_FCHMOD); req->int1 = fd; req->int2 = (long)mode; SEND; } eio_req *eio_fchown (int fd, eio_uid_t uid, eio_gid_t gid, int pri, eio_cb cb, void *data) { REQ (EIO_FCHOWN); req->int1 = fd; req->int2 = (long)uid; req->int3 = (long)gid; SEND; } eio_req *eio_dup2 (int fd, int fd2, int pri, eio_cb cb, void *data) { REQ (EIO_DUP2); req->int1 = fd; req->int2 = fd2; SEND; } eio_req *eio_sendfile (int out_fd, int in_fd, off_t in_offset, size_t length, int pri, eio_cb cb, void *data) { REQ (EIO_SENDFILE); req->int1 = out_fd; req->int2 = in_fd; req->offs = in_offset; req->size = length; SEND; } eio_req *eio_open (const char *path, int flags, mode_t mode, int pri, eio_cb cb, void *data) { REQ (EIO_OPEN); PATH; req->int1 = flags; req->int2 = (long)mode; SEND; } eio_req *eio_utime (const char *path, double atime, double mtime, int pri, eio_cb cb, void *data) { REQ (EIO_UTIME); PATH; req->nv1 = atime; req->nv2 = mtime; SEND; } eio_req *eio_truncate (const char *path, off_t offset, int pri, eio_cb cb, void *data) { REQ (EIO_TRUNCATE); PATH; req->offs = offset; SEND; } eio_req *eio_chown (const char *path, eio_uid_t uid, eio_gid_t gid, int pri, eio_cb cb, void *data) { REQ (EIO_CHOWN); PATH; req->int2 = (long)uid; req->int3 = (long)gid; SEND; } eio_req *eio_chmod (const char *path, mode_t mode, int pri, eio_cb cb, void *data) { REQ (EIO_CHMOD); PATH; req->int2 = (long)mode; SEND; } eio_req *eio_mkdir (const char *path, mode_t mode, int pri, eio_cb cb, void *data) { REQ (EIO_MKDIR); PATH; req->int2 = (long)mode; SEND; } static eio_req * eio__1path (int type, const char *path, int pri, eio_cb cb, void *data) { REQ (type); PATH; SEND; } eio_req *eio_readlink (const char *path, int pri, eio_cb cb, void *data) { return eio__1path (EIO_READLINK, path, pri, cb, data); } eio_req *eio_realpath (const char *path, int pri, eio_cb cb, void *data) { return eio__1path (EIO_REALPATH, path, pri, cb, data); } eio_req *eio_stat (const char *path, int pri, eio_cb cb, void *data) { return eio__1path (EIO_STAT, path, pri, cb, data); } eio_req *eio_lstat (const char *path, int pri, eio_cb cb, void *data) { return eio__1path (EIO_LSTAT, path, pri, cb, data); } eio_req *eio_statvfs (const char *path, int pri, eio_cb cb, void *data) { return eio__1path (EIO_STATVFS, path, pri, cb, data); } eio_req *eio_unlink (const char *path, int pri, eio_cb cb, void *data) { return eio__1path (EIO_UNLINK, path, pri, cb, data); } eio_req *eio_rmdir (const char *path, int pri, eio_cb cb, void *data) { return eio__1path (EIO_RMDIR, path, pri, cb, data); } eio_req *eio_readdir (const char *path, int flags, int pri, eio_cb cb, void *data) { REQ (EIO_READDIR); PATH; req->int1 = flags; SEND; } eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data) { REQ (EIO_MKNOD); PATH; req->int2 = (long)mode; req->offs = (off_t)dev; SEND; } static eio_req * eio__2path (int type, const char *path, const char *new_path, int pri, eio_cb cb, void *data) { REQ (type); PATH; req->flags |= EIO_FLAG_PTR2_FREE; req->ptr2 = strdup (new_path); if (!req->ptr2) { eio_api_destroy (req); return 0; } SEND; } eio_req *eio_link (const char *path, const char *new_path, int pri, eio_cb cb, void *data) { return eio__2path (EIO_LINK, path, new_path, pri, cb, data); } eio_req *eio_symlink (const char *path, const char *new_path, int pri, eio_cb cb, void *data) { return eio__2path (EIO_SYMLINK, path, new_path, pri, cb, data); } eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data) { return eio__2path (EIO_RENAME, path, new_path, pri, cb, data); } eio_req *eio_custom (void (*execute)(eio_req *), int pri, eio_cb cb, void *data) { REQ (EIO_CUSTOM); req->feed = execute; SEND; } #endif eio_req *eio_grp (eio_cb cb, void *data) { const int pri = EIO_PRI_MAX; REQ (EIO_GROUP); SEND; } #undef REQ #undef PATH #undef SEND /*****************************************************************************/ /* grp functions */ void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit) { grp->int2 = limit; grp->feed = feed; grp_try_feed (grp); } void eio_grp_limit (eio_req *grp, int limit) { grp->int2 = limit; grp_try_feed (grp); } void eio_grp_add (eio_req *grp, eio_req *req) { assert (("cannot add requests to IO::AIO::GRP after the group finished", grp->int1 != 2)); grp->flags |= EIO_FLAG_GROUPADD; ++grp->size; req->grp = grp; req->grp_prev = 0; req->grp_next = grp->grp_first; if (grp->grp_first) grp->grp_first->grp_prev = req; grp->grp_first = req; } /*****************************************************************************/ /* misc garbage */ eio_ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count) { return eio__sendfile (ofd, ifd, offset, count); }