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md: Add MD_MUSTDEALLOC support
This adds an option to detect if hole-punching is implemented by the underlying file system. If this flag is set, and if the underlying file system does not support hole-punching, md(4) fails BIO_DELETE requests with EOPNOTSUPP. Sponsored by: The FreeBSD Foundation Reviewed by: markj Differential Revision: https://reviews.freebsd.org/D31883
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@ -37,7 +37,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 6, 2020
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.Dd August 27, 2021
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.Dt MDCONFIG 8
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.Os
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.Sh NAME
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@ -246,6 +246,34 @@ This can be used with the
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flag to forcibly destroy an
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.Xr md 4
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disk that is still in use.
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.It Oo Cm no Oc Ns Cm mustdealloc
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For
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.Cm vnode
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backed devices: detect whether hole-punching is supported by the underlying file
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system.
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If the file system supports hole-punching, then to handle a
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.Dv BIO_DELETE
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request, some or all of the request's operation range may be turned into a hole
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in the file used for backing store.
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Any parts which are not turned into holes are zero-filled in
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the file.
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If the file system does not support
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hole-punching,
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.Dv BIO_DELETE
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requests to the device are not handled and will fail with
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.Er EOPNOTSUPP .
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.Pp
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When
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.Cm mustdealloc
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is not specified or
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.Oo Cm no Oc Ns Cm mustdealloc
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is specified, for a
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.Dv BIO_DELETE
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request, if the file system supports hole-punching, some or all of the request's
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operation range may be turned into a hole in the file used for backing store.
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Any parts which are not turned into holes are zero-filled in the file.
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If the file system of the vnode type memory disk does not support hole-punching,
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the request's operation range is zero-filled in the file.
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.It Oo Cm no Oc Ns Cm readonly
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Enable/disable readonly mode.
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.It Oo Cm no Oc Ns Cm verify
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@ -339,12 +367,15 @@ gnop create -o 512K md1
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mount /dev/md1.nop /mnt
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.Ed
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.Sh SEE ALSO
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.Xr fpathconf 2 ,
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.Xr fspacectl 2 ,
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.Xr open 2 ,
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.Xr md 4 ,
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.Xr ffs 7 ,
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.Xr gpart 8 ,
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.Xr mdmfs 8 ,
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.Xr malloc 9
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.Xr malloc 9 ,
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.Xr vn_deallocate 9
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.Sh HISTORY
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The
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.Nm
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@ -89,7 +89,8 @@ usage(void)
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" mdconfig file\n");
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fprintf(stderr, "\t\ttype = {malloc, vnode, swap}\n");
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fprintf(stderr, "\t\toption = {cache, cluster, compress, force,\n");
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fprintf(stderr, "\t\t readonly, reserve, ro, verify}\n");
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fprintf(stderr, "\t\t mustdealloc, readonly, reserve, ro,\n");
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fprintf(stderr, "\t\t verify}\n");
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fprintf(stderr, "\t\tsize = %%d (512 byte blocks), %%db (B),\n");
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fprintf(stderr, "\t\t %%dk (kB), %%dm (MB), %%dg (GB), \n");
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fprintf(stderr, "\t\t %%dt (TB), or %%dp (PB)\n");
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@ -194,6 +195,10 @@ main(int argc, char **argv)
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mdio.md_options |= MD_FORCE;
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else if (!strcmp(optarg, "noforce"))
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mdio.md_options &= ~MD_FORCE;
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else if (!strcmp(optarg, "mustdealloc"))
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mdio.md_options |= MD_MUSTDEALLOC;
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else if (!strcmp(optarg, "nomustdealloc"))
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mdio.md_options &= ~MD_MUSTDEALLOC;
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else if (!strcmp(optarg, "readonly"))
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mdio.md_options |= MD_READONLY;
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else if (!strcmp(optarg, "noreadonly"))
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@ -90,6 +90,7 @@
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#include <sys/sf_buf.h>
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#include <sys/sysctl.h>
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#include <sys/uio.h>
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#include <sys/unistd.h>
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#include <sys/vnode.h>
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#include <sys/disk.h>
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@ -259,6 +260,7 @@ struct md_s {
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struct g_provider *pp;
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int (*start)(struct md_s *sc, struct bio *bp);
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struct devstat *devstat;
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bool candelete;
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/* MD_MALLOC related fields */
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struct indir *indir;
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@ -885,9 +887,12 @@ mdstart_vnode(struct md_s *sc, struct bio *bp)
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case BIO_WRITE:
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auio.uio_rw = UIO_WRITE;
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break;
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case BIO_DELETE:
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case BIO_FLUSH:
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break;
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case BIO_DELETE:
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if (sc->candelete)
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break;
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/* FALLTHROUGH */
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default:
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return (EOPNOTSUPP);
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}
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@ -1176,7 +1181,7 @@ md_handleattr(struct md_s *sc, struct bio *bp)
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(g_handleattr_int(bp, "GEOM::fwsectors", sc->fwsectors) != 0 ||
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g_handleattr_int(bp, "GEOM::fwheads", sc->fwheads) != 0))
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return;
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if (g_handleattr_int(bp, "GEOM::candelete", 1) != 0)
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if (g_handleattr_int(bp, "GEOM::candelete", sc->candelete) != 0)
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return;
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if (sc->ident[0] != '\0' &&
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g_handleattr_str(bp, "GEOM::ident", sc->ident) != 0)
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@ -1405,6 +1410,7 @@ mdcreate_vnode(struct md_s *sc, struct md_req *mdr, struct thread *td)
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struct nameidata nd;
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char *fname;
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int error, flags;
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long v;
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fname = mdr->md_file;
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if (mdr->md_file_seg == UIO_USERSPACE) {
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@ -1434,6 +1440,13 @@ mdcreate_vnode(struct md_s *sc, struct md_req *mdr, struct thread *td)
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error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred);
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if (error != 0)
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goto bad;
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if ((mdr->md_options & MD_MUSTDEALLOC) != 0) {
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error = VOP_PATHCONF(nd.ni_vp, _PC_DEALLOC_PRESENT, &v);
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if (error != 0)
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goto bad;
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if (v == 0)
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sc->candelete = false;
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}
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if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) {
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vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY);
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if (VN_IS_DOOMED(nd.ni_vp)) {
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@ -1690,6 +1703,7 @@ kern_mdattach_locked(struct thread *td, struct md_req *mdr)
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mdr->md_unit = sc->unit;
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sc->mediasize = mdr->md_mediasize;
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sc->sectorsize = sectsize;
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sc->candelete = true;
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error = EDOOFUS;
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switch (sc->type) {
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case MD_MALLOC:
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@ -92,5 +92,6 @@ struct md_ioctl {
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#define MD_ASYNC 0x40 /* Asynchronous mode */
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#define MD_VERIFY 0x80 /* Open file with O_VERIFY (vnode only) */
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#define MD_CACHE 0x100 /* Cache vnode data */
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#define MD_MUSTDEALLOC 0x200 /* BIO_DELETE only if dealloc is available */
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#endif /* _SYS_MDIOCTL_H_*/
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