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Add FIOBMAP2 ioctl

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This ioctl exposes VOP_BMAP information to userland. It can be used by
programs like fragmentation analyzers and optimized cp implementations. But
I'm using it to test fusefs's VOP_BMAP implementation. The "2" in the name
distinguishes it from the similar but incompatible FIBMAP ioctls in NetBSD
and Linux.  FIOBMAP2 differs from FIBMAP in that it uses a 64-bit block
number instead of 32-bit, and it also returns runp and runb.

Reviewed by:	mckusick
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D20705
This commit is contained in:
Alan Somers 2019-06-20 14:13:10 +00:00
parent d01752c703
commit d49b446bfb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=349231
3 changed files with 35 additions and 3 deletions
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22
sys/kern/vfs_vnops.c
View File

@ -1458,6 +1458,25 @@ vn_stat(struct vnode *vp, struct stat *sb, struct ucred *active_cred,
return (0);
}
/* generic FIOBMAP2 implementation */
static int
vn_ioc_bmap2(struct file *fp, struct fiobmap2_arg *arg, struct ucred *cred)
{
struct vnode *vp = fp->f_vnode;
daddr_t lbn = arg->bn;
int error;
vn_lock(vp, LK_SHARED | LK_RETRY);
#ifdef MAC
error = mac_vnode_check_read(cred, fp->f_cred, vp);
if (error == 0)
#endif
error = VOP_BMAP(vp, lbn, NULL, &arg->bn, &arg->runp,
&arg->runb);
VOP_UNLOCK(vp, 0);
return (error);
}
/*
* File table vnode ioctl routine.
*/
@ -1481,6 +1500,9 @@ vn_ioctl(struct file *fp, u_long com, void *data, struct ucred *active_cred,
if (error == 0)
*(int *)data = vattr.va_size - fp->f_offset;
return (error);
case FIOBMAP2:
return (vn_ioc_bmap2(fp, (struct fiobmap2_arg*)data,
active_cred));
case FIONBIO:
case FIOASYNC:
return (0);

7
sys/sys/filio.h
View File

@ -62,6 +62,13 @@ struct fiodgname_arg {
/* Handle lseek SEEK_DATA and SEEK_HOLE for holey file knowledge. */
#define FIOSEEKDATA _IOWR('f', 97, off_t) /* SEEK_DATA */
#define FIOSEEKHOLE _IOWR('f', 98, off_t) /* SEEK_HOLE */
struct fiobmap2_arg {
int64_t bn;
int runp;
int runb;
};
/* Get the file's bmap info for the logical block bn */
#define FIOBMAP2 _IOWR('f', 99, struct fiobmap2_arg)
#ifdef _KERNEL
#ifdef COMPAT_FREEBSD32

9
sys/ufs/ufs/ufs_bmap.c
View File

@ -200,12 +200,15 @@ ufs_bmaparray(vp, bn, bnp, nbp, runp, runb)
*bnp = blkptrtodb(ump, ip->i_din2->di_extb[-1 - bn]);
if (*bnp == 0)
*bnp = -1;
if (nbp == NULL)
panic("ufs_bmaparray: mapping ext data");
if (nbp == NULL) {
/* indirect block not found */
return (EINVAL);
}
nbp->b_xflags |= BX_ALTDATA;
return (0);
} else {
panic("ufs_bmaparray: blkno out of range");
/* blkno out of range */
return (EINVAL);
}
/*
* Since this is FFS independent code, we are out of