diff options
| author | delphij <delphij@FreeBSD.org> | 2005-02-20 08:02:15 +0000 |
|---|---|---|
| committer | delphij <delphij@FreeBSD.org> | 2005-02-20 08:02:15 +0000 |
| commit | b62e1ca825bfc519be7b8934f4184f9b0fe96e9e (patch) | |
| tree | cacb781306afa3ef7a585d142dfcfeee26259805 /sbin/fsck_ffs/fsck.h | |
| parent | df2cf6c4d1ca8e709672406f2c2ffb760bb938a3 (diff) | |
| download | FreeBSD-src-b62e1ca825bfc519be7b8934f4184f9b0fe96e9e.zip FreeBSD-src-b62e1ca825bfc519be7b8934f4184f9b0fe96e9e.tar.gz | |
The recomputation of file system summary at mount time can be a
very slow process, especially for large file systems that is just
recovered from a crash.
Since the summary is already re-sync'ed every 30 second, we will
not lag behind too much after a crash. With this consideration
in mind, it is more reasonable to transfer the responsibility to
background fsck, to reduce the delay after a crash.
Add a new sysctl variable, vfs.ffs.compute_summary_at_mount, to
control this behavior. When set to nonzero, we will get the
"old" behavior, that the summary is computed immediately at mount
time.
Add five new sysctl variables to adjust ndir, nbfree, nifree,
nffree and numclusters respectively. Teach fsck_ffs about these
API, however, intentionally not to check the existence, since
kernels without these sysctls must have recomputed the summary
and hence no adjustments are necessary.
This change has eliminated the usual tens of minutes of delay of
mounting large dirty volumes.
Reviewed by: mckusick
MFC After: 1 week
Diffstat (limited to 'sbin/fsck_ffs/fsck.h')
| -rw-r--r-- | sbin/fsck_ffs/fsck.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sbin/fsck_ffs/fsck.h b/sbin/fsck_ffs/fsck.h index 487dcd4..55a57bc 100644 --- a/sbin/fsck_ffs/fsck.h +++ b/sbin/fsck_ffs/fsck.h @@ -252,6 +252,11 @@ long countdirs; /* number of directories we actually found */ #define MIBSIZE 3 /* size of fsck sysctl MIBs */ int adjrefcnt[MIBSIZE]; /* MIB command to adjust inode reference cnt */ int adjblkcnt[MIBSIZE]; /* MIB command to adjust inode block count */ +int adjndir[MIBSIZE]; /* MIB command to adjust number of directories */ +int adjnbfree[MIBSIZE]; /* MIB command to adjust number of free blocks */ +int adjnifree[MIBSIZE]; /* MIB command to adjust number of free inodes */ +int adjnffree[MIBSIZE]; /* MIB command to adjust number of free frags */ +int adjnumclusters[MIBSIZE]; /* MIB command to adjust number of free clusters */ int freefiles[MIBSIZE]; /* MIB command to free a set of files */ int freedirs[MIBSIZE]; /* MIB command to free a set of directories */ int freeblks[MIBSIZE]; /* MIB command to free a set of data blocks */ |
