diff options
Diffstat (limited to 'sbin/tunefs')
| -rw-r--r-- | sbin/tunefs/tunefs.8 | 12 | ||||
| -rw-r--r-- | sbin/tunefs/tunefs.c | 27 |
2 files changed, 39 insertions, 0 deletions
diff --git a/sbin/tunefs/tunefs.8 b/sbin/tunefs/tunefs.8 index b95ff9d..fbec66c 100644 --- a/sbin/tunefs/tunefs.8 +++ b/sbin/tunefs/tunefs.8 @@ -39,10 +39,12 @@ .Nd tune up an existing file system .Sh SYNOPSIS .Nm tunefs +.Op Fl A .Op Fl a Ar maxcontig .Op Fl d Ar rotdelay .Op Fl e Ar maxbpg .Op Fl m Ar minfree +.Op Fl p .Bk -words .Op Fl o Ar optimize_preference .Ek @@ -54,6 +56,10 @@ which affect the layout policies. The parameters which are to be changed are indicated by the flags given below: .Bl -tag -width Ds +.It Fl A +The file system has several backups of the super-block. Specifying +this option will cause all backups to be modified as well as the +primary super-block. This is potentially dangerous - use with caution. .It Fl a Ar maxcontig This specifies the maximum number of contiguous blocks that will be laid out before forcing a rotational delay (see @@ -103,6 +109,12 @@ fragmentation on the disk. Optimization for space has much higher overhead for file writes. The kernel normally changes the preference automatically as the percent fragmentation changes on the file system. +.It Fl p +This option shows a summary of what the current tuneable settings +are on the selected file system. More detailed information can be +obtained in the +.Xr dumpfs 8 +manual page. .El .Sh SEE ALSO .Xr fs 5 , diff --git a/sbin/tunefs/tunefs.c b/sbin/tunefs/tunefs.c index e277a71..3677d89 100644 --- a/sbin/tunefs/tunefs.c +++ b/sbin/tunefs/tunefs.c @@ -74,6 +74,7 @@ void bwrite(daddr_t, char *, int); int bread(daddr_t, char *, int); void getsb(struct fs *, char *); void usage __P((void)); +void printfs __P((void)); int main(argc, argv) @@ -117,6 +118,10 @@ again: Aflag++; continue; + case 'p': + printfs(); + exit(0); + case 'a': name = "maximum contiguous block count"; if (argc < 1) @@ -233,6 +238,7 @@ usage() fprintf(stderr, "\t-e maximum blocks per file in a cylinder group\n"); fprintf(stderr, "\t-m minimum percentage of free space\n"); fprintf(stderr, "\t-o optimization preference (`space' or `time')\n"); + fprintf(stderr, "\t-p no change - just prints current tuneable settings\n"); exit(2); } @@ -253,6 +259,27 @@ getsb(fs, file) } void +printfs() +{ + warnx("maximum contiguous block count: (-a) %d", + sblock.fs_maxcontig); + warnx("rotational delay between contiguous blocks: (-d) %d ms", + sblock.fs_rotdelay); + warnx("maximum blocks per file in a cylinder group: (-e) %d", + sblock.fs_maxbpg); + warnx("minimum percentage of free space: (-m) %d%%", + sblock.fs_minfree); + warnx("optimization preference: (-o) %s", + sblock.fs_optim == FS_OPTSPACE ? "space" : "time"); + if (sblock.fs_minfree >= MINFREE && + sblock.fs_optim == FS_OPTSPACE) + warnx(OPTWARN, "time", ">=", MINFREE); + if (sblock.fs_minfree < MINFREE && + sblock.fs_optim == FS_OPTTIME) + warnx(OPTWARN, "space", "<", MINFREE); +} + +void bwrite(blk, buf, size) daddr_t blk; char *buf; |
