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Use buffer pager for msdosfs.

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Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
This commit is contained in:
Konstantin Belousov 2016-10-28 11:46:15 +00:00
parent c39baa7480
commit 06965e96b3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=308027
1 changed files with 36 additions and 0 deletions
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36
sys/fs/msdosfs/msdosfs_vnops.c
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@ -62,11 +62,13 @@
#include <sys/namei.h>
#include <sys/priv.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/unistd.h>
#include <sys/vnode.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vnode_pager.h>
#include <fs/msdosfs/bpb.h>
#include <fs/msdosfs/direntry.h>
@ -97,6 +99,7 @@ static vop_rmdir_t msdosfs_rmdir;
static vop_symlink_t msdosfs_symlink;
static vop_readdir_t msdosfs_readdir;
static vop_bmap_t msdosfs_bmap;
static vop_getpages_t msdosfs_getpages;
static vop_strategy_t msdosfs_strategy;
static vop_print_t msdosfs_print;
static vop_pathconf_t msdosfs_pathconf;
@ -1798,6 +1801,38 @@ msdosfs_bmap(struct vop_bmap_args *ap)
return (0);
}
SYSCTL_NODE(_vfs, OID_AUTO, msdosfs, CTLFLAG_RW, 0, "msdos filesystem");
static int use_buf_pager = 1;
SYSCTL_INT(_vfs_msdosfs, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN,
&use_buf_pager, 0,
"Use buffer pager instead of bmap");
static daddr_t
msdosfs_gbp_getblkno(struct vnode *vp, vm_ooffset_t off)
{
return (de_cluster(VTODE(vp)->de_pmp, off));
}
static int
msdosfs_gbp_getblksz(struct vnode *vp, daddr_t lbn)
{
return (VTODE(vp)->de_pmp->pm_bpcluster);
}
static int
msdosfs_getpages(struct vop_getpages_args *ap)
{
if (use_buf_pager)
return (vfs_bio_getpages(ap->a_vp, ap->a_m, ap->a_count,
ap->a_rbehind, ap->a_rahead, msdosfs_gbp_getblkno,
msdosfs_gbp_getblksz));
return (vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count,
ap->a_rbehind, ap->a_rahead, NULL, NULL));
}
static int
msdosfs_strategy(struct vop_strategy_args *ap)
{
@ -1898,6 +1933,7 @@ struct vop_vector msdosfs_vnodeops = {
.vop_access = msdosfs_access,
.vop_bmap = msdosfs_bmap,
.vop_getpages = msdosfs_getpages,
.vop_cachedlookup = msdosfs_lookup,
.vop_open = msdosfs_open,
.vop_close = msdosfs_close,