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New option: NO_FFS_SNAPSHOT. I did this in p4 about the same time

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that NetBSD implemented it independently of them (don't know which one
was actually first).  This saves about 24k for those times you don't
need snapshot support (like when running off a ram disk, or in an
embedded environment where size matters).
This commit is contained in:
Warner Losh 2006-01-06 04:44:09 +00:00
parent e730167f16
commit 5c65ae3a88
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=154065
2 changed files with 63 additions and 0 deletions
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5
sys/conf/options
View File

@ -213,6 +213,11 @@ UDF_ICONV opt_dontuse.h
# otherwise a STUB module will be compiled in.
SOFTUPDATES opt_ffs.h
# On small, embedded systems, it can be useful to turn off support for
# snapshots. It saves about 30-40k for a feature that would be lightly
# used, if it is used at all.
NO_FFS_SNAPSHOT opt_ffs.h
# Enabling this option turns on support for Access Control Lists in UFS,
# which can be used to support high security configurations. Depends on
# UFS_EXTATTR.

58
sys/ufs/ffs/ffs_snapshot.c
View File

@ -66,6 +66,62 @@ __FBSDID("$FreeBSD$");
#define KERNCRED thread0.td_ucred
#define DEBUG 1
#include "opt_ffs.h"
#ifdef NO_FFS_SNAPSHOT
int
ffs_snapshot(mp, snapfile)
struct mount *mp;
char *snapfile;
{
return (EINVAL);
}
int
ffs_snapblkfree(fs, devvp, bno, size, inum)
struct fs *fs;
struct vnode *devvp;
ufs2_daddr_t bno;
long size;
ino_t inum;
{
return (EINVAL);
}
void
ffs_snapremove(vp)
struct vnode *vp;
{
}
void
ffs_snapshot_mount(mp)
struct mount *mp;
{
}
void
ffs_snapshot_unmount(mp)
struct mount *mp;
{
}
void
ffs_snapgone(ip)
struct inode *ip;
{
}
int
ffs_copyonwrite(devvp, bp)
struct vnode *devvp;
struct buf *bp;
{
return (EINVAL);
}
#else
TAILQ_HEAD(snaphead, inode);
struct snapdata {
@ -2171,3 +2227,5 @@ readblock(vp, bp, lbn)
g_destroy_bio(bip);
return (bp->b_error);
}
#endif