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Code Issues Releases Activity

Provide vfs suspension support only for filesystems which need it, take

Browse Source 
two.

nullfs and unionfs need to request suspension if underlying filesystem(s)
use it. Utilize mnt_kern_flag for this purpose.

This is a fixup for 273271.

No strong objections from: kib
Pointy hat to: mjg
MFC after:	2 weeks
This commit is contained in:
Mateusz Guzik 2014-10-20 18:00:50 +00:00
parent a8a07fd613
commit 4fce16e4c9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=273336
6 changed files with 18 additions and 16 deletions
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2
sys/fs/nullfs/null_vfsops.c
View File

@ -198,6 +198,8 @@ nullfs_mount(struct mount *mp)
MNTK_EXTENDED_SHARED);
}
mp->mnt_kern_flag |= MNTK_LOOKUP_EXCL_DOTDOT;
mp->mnt_kern_flag |= lowerrootvp->v_mount->mnt_kern_flag &
MNTK_SUSPENDABLE;
MNT_IUNLOCK(mp);
mp->mnt_data = xmp;
vfs_getnewfsid(mp);

10
sys/fs/tmpfs/tmpfs_vfsops.c
View File

@ -255,6 +255,7 @@ tmpfs_mount(struct mount *mp)
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_kern_flag |= MNTK_SUSPENDABLE;
MNT_IUNLOCK(mp);
mp->mnt_data = tmp;
@ -426,14 +427,6 @@ tmpfs_sync(struct mount *mp, int waitfor)
return (0);
}
/*
* A stub created so that vfs does vn_start_write for this filesystem
*/
static void
tmpfs_susp_clean(struct mount *mp)
{
}
/*
* tmpfs vfs operations.
*/
@ -445,6 +438,5 @@ struct vfsops tmpfs_vfsops = {
.vfs_statfs = tmpfs_statfs,
.vfs_fhtovp = tmpfs_fhtovp,
.vfs_sync = tmpfs_sync,
.vfs_susp_clean = tmpfs_susp_clean,
};
VFS_SET(tmpfs_vfsops, tmpfs, VFCF_JAIL);

7
sys/fs/unionfs/union_vfsops.c
View File

@ -297,6 +297,13 @@ unionfs_domount(struct mount *mp)
if ((ump->um_lowervp->v_mount->mnt_flag & MNT_LOCAL) &&
(ump->um_uppervp->v_mount->mnt_flag & MNT_LOCAL))
mp->mnt_flag |= MNT_LOCAL;
/*
* Check mnt_kern_flag
*/
if ((ump->um_lowervp->v_mount->mnt_flag & MNTK_SUSPENDABLE) ||
(ump->um_uppervp->v_mount->mnt_flag & MNTK_SUSPENDABLE))
mp->mnt_kern_flag |= MNTK_SUSPENDABLE;
MNT_IUNLOCK(mp);
/*

2
sys/kern/vfs_vnops.c
View File

@ -1576,7 +1576,7 @@ static bool
vn_suspendable_mp(struct mount *mp)
{
return (mp->mnt_op->vfs_susp_clean != NULL);
return ((mp->mnt_kern_flag & MNTK_SUSPENDABLE) != 0);
}
static bool

11
sys/sys/mount.h
View File

@ -361,7 +361,7 @@ void __mnt_vnode_markerfree_active(struct vnode **mvp, struct mount *);
#define MNTK_SUSPEND 0x08000000 /* request write suspension */
#define MNTK_SUSPEND2 0x04000000 /* block secondary writes */
#define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */
#define MNTK_UNUSED25 0x20000000 /* --available-- */
#define MNTK_SUSPENDABLE 0x20000000 /* writes can be suspended */
#define MNTK_LOOKUP_SHARED 0x40000000 /* FS supports shared lock lookups */
#define MNTK_NOKNOTE 0x80000000 /* Don't send KNOTEs from VOP hooks */
@ -754,10 +754,11 @@ vfs_statfs_t __vfs_statfs;
_rc; })
#define VFS_SUSP_CLEAN(MP) do { \
MPASS(*(MP)->mnt_op->vfs_susp_clean != NULL); \
VFS_PROLOGUE(MP); \
(*(MP)->mnt_op->vfs_susp_clean)(MP); \
VFS_EPILOGUE(MP); \
if (*(MP)->mnt_op->vfs_susp_clean != NULL) { \
VFS_PROLOGUE(MP); \
(*(MP)->mnt_op->vfs_susp_clean)(MP); \
VFS_EPILOGUE(MP); \
} \
} while (0)
#define VFS_RECLAIM_LOWERVP(MP, VP) do { \

2
sys/ufs/ffs/ffs_vfsops.c
View File

@ -1055,7 +1055,7 @@ ffs_mountfs(devvp, mp, td)
*/
MNT_ILOCK(mp);
mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED |
MNTK_NO_IOPF | MNTK_UNMAPPED_BUFS;
MNTK_NO_IOPF | MNTK_UNMAPPED_BUFS | MNTK_SUSPENDABLE;
MNT_IUNLOCK(mp);
#ifdef UFS_EXTATTR
#ifdef UFS_EXTATTR_AUTOSTART