Date: Sun, 19 Jul 2020 03:02:46 +0000 (UTC) From: Xin LI <delphij@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r363317 - stable/11/sbin/newfs_msdos Message-ID: <202007190302.06J32kUW004659@repo.freebsd.org>
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Author: delphij Date: Sun Jul 19 03:02:46 2020 New Revision: 363317 URL: https://svnweb.freebsd.org/changeset/base/363317 Log: MFC r362937: Use KERN_MAXPHYS. Modified: stable/11/sbin/newfs_msdos/mkfs_msdos.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sbin/newfs_msdos/mkfs_msdos.c ============================================================================== --- stable/11/sbin/newfs_msdos/mkfs_msdos.c Sun Jul 19 02:14:34 2020 (r363316) +++ stable/11/sbin/newfs_msdos/mkfs_msdos.c Sun Jul 19 03:02:46 2020 (r363317) @@ -36,8 +36,10 @@ static const char rcsid[] = #include <sys/disklabel.h> #include <sys/mount.h> #include <sys/stat.h> +#include <sys/sysctl.h> #include <sys/time.h> +#include <assert.h> #include <ctype.h> #include <err.h> #include <errno.h> @@ -73,25 +75,6 @@ static const char rcsid[] = #define MAXCLS16 0xfff4U /* maximum FAT16 clusters */ #define MAXCLS32 0xffffff4U /* maximum FAT32 clusters */ -#ifndef CTASSERT -#define CTASSERT(x) _CTASSERT(x, __LINE__) -#define _CTASSERT(x, y) __CTASSERT(x, y) -#define __CTASSERT(x, y) typedef char __assert_ ## y [(x) ? 1 : -1] -#endif - -/* - * For better performance, we want to write larger chunks instead of - * individual sectors (the size can only be 512, 1024, 2048 or 4096 - * bytes). Assert that MAXPHYS can always hold an integer number of - * sectors by asserting that both are power of two numbers and the - * MAXPHYS is greater than MAXBPS. - */ -CTASSERT(powerof2(MAXPHYS)); -CTASSERT(powerof2(MAXBPS)); -CTASSERT(MAXPHYS > MAXBPS); - -const static ssize_t chunksize = MAXPHYS; - #define mincls(fat) ((fat) == 12 ? MINCLS12 : \ (fat) == 16 ? MINCLS16 : \ MINCLS32) @@ -235,6 +218,7 @@ static volatile sig_atomic_t got_siginfo; static void infohandler(int); static int check_mounted(const char *, mode_t); +static ssize_t getchunksize(void); static int getstdfmt(const char *, struct bpb *); static int getdiskinfo(int, const char *, const char *, int, struct bpb *); static void print_bpb(struct bpb *); @@ -267,6 +251,7 @@ mkfs_msdos(const char *fname, const char *dtype, const bool set_res, set_spf, set_spc; int fd, fd1, rv; struct msdos_options o = *op; + ssize_t chunksize; physbuf = NULL; rv = -1; @@ -629,6 +614,7 @@ mkfs_msdos(const char *fname, const char *dtype, const tm = localtime(&now); } + chunksize = getchunksize(); physbuf = malloc(chunksize); if (physbuf == NULL) { warn(NULL); @@ -829,6 +815,47 @@ check_mounted(const char *fname, mode_t mode) } } return 0; +} + +/* + * Get optimal I/O size + */ +static ssize_t +getchunksize(void) +{ + static int chunksize; + + if (chunksize != 0) + return ((ssize_t)chunksize); + +#ifdef KERN_MAXPHYS + int mib[2]; + size_t len; + + mib[0] = CTL_KERN; + mib[1] = KERN_MAXPHYS; + len = sizeof(chunksize); + + if (sysctl(mib, 2, &chunksize, &len, NULL, 0) == -1) { + warn("sysctl: KERN_MAXPHYS, using %zu", (size_t)MAXPHYS); + chunksize = 0; + } +#endif + if (chunksize == 0) + chunksize = MAXPHYS; + + /* + * For better performance, we want to write larger chunks instead of + * individual sectors (the size can only be 512, 1024, 2048 or 4096 + * bytes). Assert that chunksize can always hold an integer number of + * sectors by asserting that both are power of two numbers and the + * chunksize is greater than MAXBPS. + */ + static_assert(powerof2(MAXBPS), "MAXBPS is not power of 2"); + assert(powerof2(chunksize)); + assert(chunksize > MAXBPS); + + return ((ssize_t)chunksize); } /*
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