--- libeio/eio.c 2009/04/22 11:04:49 1.29 +++ libeio/eio.c 2010/01/02 14:24:32 1.49 @@ -1,7 +1,7 @@ /* * libeio implementation * - * Copyright (c) 2007,2008 Marc Alexander Lehmann + * Copyright (c) 2007,2008,2009,2010 Marc Alexander Lehmann * All rights reserved. * * Redistribution and use in source and binary forms, with or without modifica- @@ -70,17 +70,35 @@ #ifdef _WIN32 /*doh*/ - #else # include "config.h" # include # include +# include # include # include # include # include +/* 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 @@ -90,18 +108,28 @@ #if HAVE_SENDFILE # if __linux # include -# elif __freebsd +# elif __freebsd || defined __APPLE__ # include # include # elif __hpux # include -# elif __solaris /* not yet */ +# 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(de) strlen ((de)->d_name) +#endif + /* number of seconds after which an idle threads exit */ #define IDLE_TIMEOUT 10 @@ -161,6 +189,7 @@ closedir (wrk->dirp); \ wrk->dirp = 0; \ } + #define ETP_WORKER_COMMON \ void *dbuf; \ DIR *dirp; @@ -169,7 +198,7 @@ #define ETP_NUM_PRI (ETP_PRI_MAX - ETP_PRI_MIN + 1) -/* calculcate time difference in ~1/EIO_TICKS of a second */ +/* calculate time difference in ~1/EIO_TICKS of a second */ static int tvdiff (struct timeval *tv1, struct timeval *tv2) { return (tv2->tv_sec - tv1->tv_sec ) * EIO_TICKS @@ -571,7 +600,7 @@ static void etp_set_max_poll_time (double nseconds) { if (WORDACCESS_UNSAFE) X_LOCK (reslock); - max_poll_time = nseconds; + max_poll_time = nseconds * EIO_TICKS; if (WORDACCESS_UNSAFE) X_UNLOCK (reslock); } @@ -773,7 +802,7 @@ ooffset = lseek (fd, 0, SEEK_CUR); lseek (fd, offset, SEEK_SET); res = write (fd, buf, count); - lseek (fd, offset, SEEK_SET); + lseek (fd, ooffset, SEEK_SET); X_UNLOCK (preadwritelock); return res; @@ -840,7 +869,7 @@ #endif /* even though we could play tricks with the flags, it's better to always - * call fdatasync, as thta matches the expectation of it's users best */ + * call fdatasync, as that matches the expectation of its users best */ return fdatasync (fd); } @@ -896,6 +925,16 @@ res = sbytes; } +# elif defined (__APPLE__) + + { + off_t sbytes = count; + res = sendfile (ifd, ofd, offset, &sbytes, 0, 0); + + if (res < 0 && errno == EAGAIN && sbytes) + res = sbytes; + } + # elif __hpux res = sendfile (ofd, ifd, offset, count, 0, 0); @@ -916,6 +955,16 @@ } # endif + +#elif defined (_WIN32) + + /* does not work, just for documentation of what would need to be done */ + { + 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; @@ -923,6 +972,11 @@ 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 + || errno == EOPNOTSUPP /* BSDs */ #if __solaris || errno == EAFNOSUPPORT || errno == EPROTOTYPE #endif @@ -963,6 +1017,169 @@ return res; } +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, ino_t inode_bits) +{ + unsigned char bits [9 + sizeof (ino_t) * 8]; + unsigned char *bit = bits; + + assert (CHAR_BIT == 8); + assert (sizeof (eio_dirent) * 8 < 256); + assert (offsetof (eio_dirent, inode)); /* we use 0 as sentinel */ + assert (offsetof (eio_dirent, score)); /* we use 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 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 */ + { + ino_t endianness; + int i, j; + + /* we store the byte offset of byte n into byte n of "endianness" */ + for (i = 0; i < sizeof (ino_t); ++i) + ((unsigned char *)&endianness)[i] = i; + + *bit++ = 0; + + for (i = 0; i < sizeof (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 & (((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 (ino_t) * 8], *base; + eio_dirent *end_stk [9 + sizeof (ino_t) * 8], *end; + unsigned char *bit_stk [9 + sizeof (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, 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) @@ -970,59 +1187,218 @@ DIR *dirp; EIO_STRUCT_DIRENT *entp; char *name, *names; - int memlen = 4096; - int memofs = 0; - int res = 0; + int namesalloc = 4096; + int namesoffs = 0; + int flags = req->int1; + eio_dirent *dents = 0; + int dentalloc = 128; + int dentoffs = 0; + ino_t inode_bits = 0; + + req->result = -1; + + if (!(flags & EIO_READDIR_DENTS)) + flags &= ~(EIO_READDIR_DIRS_FIRST | EIO_READDIR_STAT_ORDER); X_LOCK (wrklock); /* the corresponding closedir is in ETP_WORKER_CLEAR */ self->dirp = dirp = opendir (req->ptr1); - req->flags |= EIO_FLAG_PTR2_FREE; - req->ptr2 = names = malloc (memlen); + 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); X_UNLOCK (wrklock); - if (dirp && names) + if (dirp && names && (!flags || dents)) for (;;) { errno = 0; entp = readdir (dirp); if (!entp) - break; + { + if (errno) + break; + + /* sort etc. */ + req->int1 = flags; + req->result = dentoffs; + + if (flags & EIO_READDIR_STAT_ORDER) + eio_dent_sort (dents, dentoffs, 0, inode_bits); /* sort by inode exclusively */ + 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 */ + /* also clear score, so it doesn't influence sorting */ + 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 */ + eio_dent_sort (dents, dir - dents, 0, inode_bits); + } + + break; + } + /* now add the entry to our list(s) */ name = entp->d_name; + /* skip . and .. entries */ if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2]))) { - int len = strlen (name) + 1; + int len = D_NAMLEN (entp) + 1; - res++; - - while (memofs + len > memlen) + while (expect_false (namesoffs + len > namesalloc)) { - memlen *= 2; + namesalloc *= 2; X_LOCK (wrklock); - req->ptr2 = names = realloc (names, memlen); + req->ptr2 = names = realloc (names, namesalloc); X_UNLOCK (wrklock); if (!names) break; } - memcpy (names + memofs, name, len); - memofs += len; + memcpy (names + namesoffs, name, len); + + if (dents) + { + struct eio_dirent *ent; + + if (expect_false (dentoffs == dentalloc)) + { + dentalloc *= 2; + X_LOCK (wrklock); + req->ptr1 = dents = realloc (dents, dentalloc * sizeof (eio_dirent)); + X_UNLOCK (wrklock); + + 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 (errno) - res = -1; - - req->result = res; + if (EIO_CANCELLED (req)) + { + errno = ECANCELED; + break; + } + } } #if !(_POSIX_MAPPED_FILES && _POSIX_SYNCHRONIZED_IO) -# undef msync -# define msync(a,b,c) ((errno = ENOSYS), -1) +# define eio__msync(a,b,c) ((errno = ENOSYS), -1) +#else + +int +eio__msync (void *mem, size_t len, int flags) +{ + 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 int @@ -1039,10 +1415,11 @@ page = sysconf (_SC_PAGESIZE); #endif + /* round down to start of page, although this is probably useless */ addr &= ~(page - 1); /* assume page size is always a power of two */ if (addr < end) - if (flags) /* modify */ + if (flags & EIO_MT_MODIFY) /* modify */ do { *((volatile sig_atomic_t *)addr) |= 0; } while ((addr += page) < len); else do { *((volatile sig_atomic_t *)addr) ; } while ((addr += page) < len); @@ -1224,7 +1601,7 @@ 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_MSYNC: req->result = msync (req->ptr2, req->size, req->int1); break; + case EIO_MSYNC: req->result = eio__msync (req->ptr2, req->size, req->int1); break; case EIO_MTOUCH: req->result = eio__mtouch (req->ptr2, req->size, req->int1); break; case EIO_SYNC_FILE_RANGE: req->result = eio__sync_file_range (req->int1, req->offs, req->size, req->int2); break; @@ -1447,9 +1824,9 @@ return eio__1path (EIO_RMDIR, path, pri, cb, data); } -eio_req *eio_readdir (const char *path, int pri, eio_cb cb, void *data) +eio_req *eio_readdir (const char *path, int flags, int pri, eio_cb cb, void *data) { - return eio__1path (EIO_READDIR, path, pri, cb, 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) @@ -1548,12 +1925,15 @@ ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count) { etp_worker wrk; + ssize_t ret; wrk.dbuf = 0; - eio__sendfile (ofd, ifd, offset, count, &wrk); + ret = eio__sendfile (ofd, ifd, offset, count, &wrk); if (wrk.dbuf) free (wrk.dbuf); + + return ret; }