Create struct snapdata which contains the snapshot fields from cdev
and the previously malloc'ed snapshot lock. Malloc struct snapdata instead of just the lock. Replace snapshot fields in cdev with pointer to snapdata (saves 16 bytes). While here, give the private readblock() function a vnode argument in preparation for moving UFS to access GEOM directly.
This commit is contained in:
Poul-Henning Kamp
parent
883d3c0c07
commit
67673e6677
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=135138
@ -293,7 +293,6 @@ allocdev(void)
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si->__si_namebuf[0] = '\0';
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si->si_name = si->__si_namebuf;
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LIST_INIT(&si->si_children);
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TAILQ_INIT(&si->si_snapshots);
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return (si);
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}
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@ -47,7 +47,7 @@ struct tty;
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struct disk;
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struct vnode;
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struct buf;
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TAILQ_HEAD(snaphead, inode);
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struct snapdata;
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struct cdev {
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u_int si_flags;
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@ -93,9 +93,7 @@ struct cdev {
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struct mount *__sid_mountpoint;
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int __sid_bsize_phys; /* min physical block size */
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int __sid_bsize_best; /* optimal block size */
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struct snaphead __sid_snapshots;
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daddr_t __sid_snaplistsize; /* size of snapblklist. */
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daddr_t *__sid_snapblklist; /* known snapshot blocks. */
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struct snapdata *__sid_snapdata;
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int (*__sid_copyonwrite)(struct vnode *, struct buf *);
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} __si_disk;
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} __si_u;
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@ -106,9 +104,7 @@ struct cdev {
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#define si_mountpoint __si_u.__si_disk.__sid_mountpoint
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#define si_bsize_phys __si_u.__si_disk.__sid_bsize_phys
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#define si_bsize_best __si_u.__si_disk.__sid_bsize_best
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#define si_snapshots __si_u.__si_disk.__sid_snapshots
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#define si_snaplistsize __si_u.__si_disk.__sid_snaplistsize
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#define si_snapblklist __si_u.__si_disk.__sid_snapblklist
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#define si_snapdata __si_u.__si_disk.__sid_snapdata
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#define si_copyonwrite __si_u.__si_disk.__sid_copyonwrite
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/*
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@ -64,6 +64,15 @@ __FBSDID("$FreeBSD$");
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#define KERNCRED thread0.td_ucred
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#define DEBUG 1
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TAILQ_HEAD(snaphead, inode);
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struct snapdata {
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struct snaphead sn_head;
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daddr_t sn_listsize;
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daddr_t *sn_blklist;
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struct lock sn_lock;
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};
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static int cgaccount(int, struct vnode *, struct buf *, int);
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static int expunge_ufs1(struct vnode *, struct inode *, struct fs *,
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int (*)(struct vnode *, ufs1_daddr_t *, ufs1_daddr_t *, struct fs *,
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@ -92,7 +101,7 @@ static int snapacct_ufs2(struct vnode *, ufs2_daddr_t *, ufs2_daddr_t *,
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static int mapacct_ufs2(struct vnode *, ufs2_daddr_t *, ufs2_daddr_t *,
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struct fs *, ufs_lbn_t, int);
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static int ffs_copyonwrite(struct vnode *, struct buf *);
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static int readblock(struct buf *, ufs2_daddr_t);
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static int readblock(struct vnode *vp, struct buf *, ufs2_daddr_t);
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/*
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* To ensure the consistency of snapshots across crashes, we must
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@ -131,7 +140,6 @@ ffs_snapshot(mp, snapfile)
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int32_t *lp;
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void *space;
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struct fs *copy_fs = NULL, *fs = VFSTOUFS(mp)->um_fs;
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struct snaphead *snaphead;
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struct thread *td = curthread;
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struct inode *ip, *xp;
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struct buf *bp, *nbp, *ibp, *sbp = NULL;
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@ -141,6 +149,12 @@ ffs_snapshot(mp, snapfile)
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struct vnode *vp, *xvp, *nvp, *devvp;
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struct uio auio;
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struct iovec aiov;
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struct snapdata *sn;
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/*
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* XXX: make sure we don't go to out1 before we setup sn
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*/
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sn = (void *)0xdeadbeef;
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/*
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* Need to serialize access to snapshot code per filesystem.
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@ -213,7 +227,7 @@ ffs_snapshot(mp, snapfile)
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ip->i_size = lblktosize(fs, (off_t)numblks);
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DIP_SET(ip, i_size, ip->i_size);
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ip->i_flag |= IN_CHANGE | IN_UPDATE;
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if ((error = readblock(bp, numblks - 1)) != 0)
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if ((error = readblock(vp, bp, numblks - 1)) != 0)
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goto out;
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bawrite(bp);
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/*
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@ -488,24 +502,22 @@ ffs_snapshot(mp, snapfile)
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* up our original private lock.
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*/
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VI_LOCK(devvp);
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snaphead = &devvp->v_rdev->si_snapshots;
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if ((xp = TAILQ_FIRST(snaphead)) != NULL) {
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struct lock *lkp;
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lkp = ITOV(xp)->v_vnlock;
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sn = devvp->v_rdev->si_snapdata;
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if (sn != NULL) {
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xp = TAILQ_FIRST(&sn->sn_head);
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VI_UNLOCK(devvp);
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VI_LOCK(vp);
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vp->v_vnlock = lkp;
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vp->v_vnlock = &sn->sn_lock;
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} else {
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struct lock *lkp;
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VI_UNLOCK(devvp);
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MALLOC(lkp, struct lock *, sizeof(struct lock), M_UFSMNT,
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M_WAITOK);
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lockinit(lkp, PVFS, "snaplk", VLKTIMEOUT,
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sn = malloc(sizeof *sn, M_UFSMNT, M_WAITOK | M_ZERO);
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TAILQ_INIT(&sn->sn_head);
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lockinit(&sn->sn_lock, PVFS, "snaplk", VLKTIMEOUT,
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LK_CANRECURSE | LK_NOPAUSE);
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VI_LOCK(vp);
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vp->v_vnlock = lkp;
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vp->v_vnlock = &sn->sn_lock;
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devvp->v_rdev->si_snapdata = sn;
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xp = NULL;
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}
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vn_lock(vp, LK_INTERLOCK | LK_EXCLUSIVE | LK_RETRY, td);
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transferlockers(&vp->v_lock, vp->v_vnlock);
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@ -534,10 +546,10 @@ ffs_snapshot(mp, snapfile)
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*blkp++ = fragstoblks(fs, cgtod(fs, cg));
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snapblklist[0] = blkp - snapblklist;
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VI_LOCK(devvp);
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if (devvp->v_rdev->si_snapblklist != NULL)
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if (sn->sn_blklist != NULL)
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panic("ffs_snapshot: non-empty list");
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devvp->v_rdev->si_snapblklist = snapblklist;
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devvp->v_rdev->si_snaplistsize = blkp - snapblklist;
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sn->sn_blklist = snapblklist;
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sn->sn_listsize = blkp - snapblklist;
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VI_UNLOCK(devvp);
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}
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/*
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@ -548,13 +560,14 @@ ffs_snapshot(mp, snapfile)
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fs->fs_snapinum[snaploc] = ip->i_number;
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if (ip->i_nextsnap.tqe_prev != 0)
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panic("ffs_snapshot: %d already on list", ip->i_number);
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TAILQ_INSERT_TAIL(snaphead, ip, i_nextsnap);
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TAILQ_INSERT_TAIL(&sn->sn_head, ip, i_nextsnap);
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devvp->v_rdev->si_copyonwrite = ffs_copyonwrite;
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devvp->v_vflag |= VV_COPYONWRITE;
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VI_UNLOCK(devvp);
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ASSERT_VOP_LOCKED(vp, "ffs_snapshot vp");
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vp->v_vflag |= VV_SYSTEM;
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out1:
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KASSERT(sn != (void *)0xdeadbeef, ("email phk@ and mckusick@"));
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/*
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* Resume operation on filesystem.
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*/
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@ -573,8 +586,7 @@ ffs_snapshot(mp, snapfile)
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* Copy allocation information from all the snapshots in
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* this snapshot and then expunge them from its view.
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*/
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snaphead = &devvp->v_rdev->si_snapshots;
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TAILQ_FOREACH(xp, snaphead, i_nextsnap) {
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TAILQ_FOREACH(xp, &sn->sn_head, i_nextsnap) {
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if (xp == ip)
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break;
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if (xp->i_ump->um_fstype == UFS1)
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@ -654,14 +666,14 @@ ffs_snapshot(mp, snapfile)
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* should replace the previous list.
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*/
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VI_LOCK(devvp);
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space = devvp->v_rdev->si_snapblklist;
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devvp->v_rdev->si_snapblklist = snapblklist;
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devvp->v_rdev->si_snaplistsize = snaplistsize;
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space = sn->sn_blklist;
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sn->sn_blklist = snapblklist;
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sn->sn_listsize = snaplistsize;
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VI_UNLOCK(devvp);
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if (space != NULL)
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FREE(space, M_UFSMNT);
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done:
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free(copy_fs->fs_csp, M_UFSMNT);
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FREE(copy_fs->fs_csp, M_UFSMNT);
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bawrite(sbp);
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out:
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if (saved_nice > 0) {
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@ -845,7 +857,7 @@ expunge_ufs1(snapvp, cancelip, fs, acctfunc, expungetype)
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fs->fs_bsize, KERNCRED, 0, &bp);
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if (error)
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return (error);
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if ((error = readblock(bp, lbn)) != 0)
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if ((error = readblock(snapvp, bp, lbn)) != 0)
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return (error);
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}
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/*
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@ -932,7 +944,7 @@ indiracct_ufs1(snapvp, cancelvp, level, blkno, lbn, rlbn, remblks,
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bp = getblk(cancelvp, lbn, fs->fs_bsize, 0, 0, 0);
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bp->b_blkno = fsbtodb(fs, blkno);
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if ((bp->b_flags & (B_DONE | B_DELWRI)) == 0 &&
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(error = readblock(bp, fragstoblks(fs, blkno)))) {
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(error = readblock(cancelvp, bp, fragstoblks(fs, blkno)))) {
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brelse(bp);
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return (error);
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}
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@ -1125,7 +1137,7 @@ expunge_ufs2(snapvp, cancelip, fs, acctfunc, expungetype)
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fs->fs_bsize, KERNCRED, 0, &bp);
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if (error)
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return (error);
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if ((error = readblock(bp, lbn)) != 0)
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if ((error = readblock(snapvp, bp, lbn)) != 0)
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return (error);
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}
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/*
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@ -1212,7 +1224,7 @@ indiracct_ufs2(snapvp, cancelvp, level, blkno, lbn, rlbn, remblks,
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bp = getblk(cancelvp, lbn, fs->fs_bsize, 0, 0, 0);
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bp->b_blkno = fsbtodb(fs, blkno);
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if ((bp->b_flags & (B_DONE | B_DELWRI)) == 0 &&
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(error = readblock(bp, fragstoblks(fs, blkno)))) {
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(error = readblock(cancelvp, bp, fragstoblks(fs, blkno)))) {
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brelse(bp);
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return (error);
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}
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@ -1365,13 +1377,17 @@ ffs_snapgone(ip)
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struct inode *xp;
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struct fs *fs;
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int snaploc;
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struct snapdata *sn;
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/*
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* Find snapshot in incore list.
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*/
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TAILQ_FOREACH(xp, &ip->i_devvp->v_rdev->si_snapshots, i_nextsnap)
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if (xp == ip)
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break;
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xp = NULL;
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sn = ip->i_devvp->v_rdev->si_snapdata;
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if (sn != NULL)
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TAILQ_FOREACH(xp, &sn->sn_head, i_nextsnap)
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if (xp == ip)
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break;
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if (xp != NULL)
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vrele(ITOV(ip));
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else if (snapdebug)
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@ -1409,10 +1425,12 @@ ffs_snapremove(vp)
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struct thread *td = curthread;
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ufs2_daddr_t numblks, blkno, dblk, *snapblklist;
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int error, loc, last;
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struct snapdata *sn;
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ip = VTOI(vp);
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fs = ip->i_fs;
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devvp = ip->i_devvp;
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sn = devvp->v_rdev->si_snapdata;
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/*
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* If active, delete from incore list (this snapshot may
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* already have been in the process of being deleted, so
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@ -1425,23 +1443,24 @@ ffs_snapremove(vp)
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lockmgr(&vp->v_lock, LK_INTERLOCK | LK_EXCLUSIVE,
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VI_MTX(devvp), td);
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VI_LOCK(devvp);
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TAILQ_REMOVE(&devvp->v_rdev->si_snapshots, ip, i_nextsnap);
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TAILQ_REMOVE(&sn->sn_head, ip, i_nextsnap);
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ip->i_nextsnap.tqe_prev = 0;
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lkp = vp->v_vnlock;
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vp->v_vnlock = &vp->v_lock;
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lockmgr(lkp, LK_RELEASE, NULL, td);
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if (TAILQ_FIRST(&devvp->v_rdev->si_snapshots) != 0) {
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if (TAILQ_FIRST(&sn->sn_head) != 0) {
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VI_UNLOCK(devvp);
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} else {
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snapblklist = devvp->v_rdev->si_snapblklist;
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devvp->v_rdev->si_snapblklist = 0;
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devvp->v_rdev->si_snaplistsize = 0;
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devvp->v_rdev->si_copyonwrite = 0;
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snapblklist = sn->sn_blklist;
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sn->sn_blklist = 0;
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sn->sn_listsize = 0;
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devvp->v_rdev->si_snapdata = NULL;
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devvp->v_vflag &= ~VV_COPYONWRITE;
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lockmgr(lkp, LK_DRAIN|LK_INTERLOCK, VI_MTX(devvp), td);
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lockmgr(lkp, LK_RELEASE, NULL, td);
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lockdestroy(lkp);
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FREE(lkp, M_UFSMNT);
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free(sn, M_UFSMNT);
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FREE(snapblklist, M_UFSMNT);
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}
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}
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@ -1538,13 +1557,13 @@ ffs_snapblkfree(fs, devvp, bno, size, inum)
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ufs_lbn_t lbn;
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ufs2_daddr_t blkno;
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int indiroff = 0, snapshot_locked = 0, error = 0, claimedblk = 0;
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struct snaphead *snaphead;
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struct snapdata *sn;
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lbn = fragstoblks(fs, bno);
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retry:
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VI_LOCK(devvp);
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snaphead = &devvp->v_rdev->si_snapshots;
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TAILQ_FOREACH(ip, snaphead, i_nextsnap) {
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sn = devvp->v_rdev->si_snapdata;
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TAILQ_FOREACH(ip, &sn->sn_head, i_nextsnap) {
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vp = ITOV(ip);
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/*
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* Lookup block being written.
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@ -1695,7 +1714,7 @@ ffs_snapblkfree(fs, devvp, bno, size, inum)
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/*
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* Otherwise, read the old block contents into the buffer.
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*/
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if ((error = readblock(cbp, lbn)) != 0) {
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if ((error = readblock(vp, cbp, lbn)) != 0) {
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bzero(cbp->b_data, fs->fs_bsize);
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bawrite(cbp);
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if (dopersistence && ip->i_effnlink > 0)
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@ -1739,7 +1758,7 @@ ffs_snapshot_mount(mp)
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struct vnode *devvp = ump->um_devvp;
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struct fs *fs = ump->um_fs;
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struct thread *td = curthread;
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struct snaphead *snaphead;
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struct snapdata *sn;
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struct vnode *vp;
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struct inode *ip, *xp;
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struct uio auio;
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@ -1758,7 +1777,7 @@ ffs_snapshot_mount(mp)
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* Process each snapshot listed in the superblock.
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*/
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vp = NULL;
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snaphead = &devvp->v_rdev->si_snapshots;
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sn = devvp->v_rdev->si_snapdata;
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for (snaploc = 0; snaploc < FSMAXSNAP; snaploc++) {
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if (fs->fs_snapinum[snaploc] == 0)
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break;
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@ -1798,7 +1817,7 @@ ffs_snapshot_mount(mp)
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* lock and give up our original private lock.
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*/
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VI_LOCK(devvp);
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if ((xp = TAILQ_FIRST(snaphead)) != NULL) {
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if ((xp = TAILQ_FIRST(&sn->sn_head)) != NULL) {
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struct lock *lkp;
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lkp = ITOV(xp)->v_vnlock;
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@ -1827,7 +1846,7 @@ ffs_snapshot_mount(mp)
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panic("ffs_snapshot_mount: %d already on list",
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ip->i_number);
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else
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TAILQ_INSERT_TAIL(snaphead, ip, i_nextsnap);
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TAILQ_INSERT_TAIL(&sn->sn_head, ip, i_nextsnap);
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vp->v_vflag |= VV_SYSTEM;
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VI_UNLOCK(devvp);
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VOP_UNLOCK(vp, 0, td);
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@ -1873,9 +1892,9 @@ ffs_snapshot_mount(mp)
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VOP_UNLOCK(vp, 0, td);
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VI_LOCK(devvp);
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ASSERT_VOP_LOCKED(devvp, "ffs_snapshot_mount");
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devvp->v_rdev->si_snaplistsize = snaplistsize;
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devvp->v_rdev->si_snapblklist = (daddr_t *)snapblklist;
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devvp->v_rdev->si_copyonwrite = ffs_copyonwrite;
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sn->sn_listsize = snaplistsize;
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sn->sn_blklist = (daddr_t *)snapblklist;
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devvp->v_vflag |= VV_COPYONWRITE;
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VI_UNLOCK(devvp);
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}
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@ -1888,17 +1907,16 @@ ffs_snapshot_unmount(mp)
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struct mount *mp;
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{
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struct vnode *devvp = VFSTOUFS(mp)->um_devvp;
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struct snaphead *snaphead = &devvp->v_rdev->si_snapshots;
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struct lock *lkp = NULL;
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struct snapdata *sn;
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struct inode *xp;
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struct vnode *vp;
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sn = devvp->v_rdev->si_snapdata;
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VI_LOCK(devvp);
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while ((xp = TAILQ_FIRST(snaphead)) != 0) {
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while ((xp = TAILQ_FIRST(&sn->sn_head)) != 0) {
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vp = ITOV(xp);
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lkp = vp->v_vnlock;
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vp->v_vnlock = &vp->v_lock;
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TAILQ_REMOVE(snaphead, xp, i_nextsnap);
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||||
TAILQ_REMOVE(&sn->sn_head, xp, i_nextsnap);
|
||||
xp->i_nextsnap.tqe_prev = 0;
|
||||
if (xp->i_effnlink > 0) {
|
||||
VI_UNLOCK(devvp);
|
||||
@ -1906,17 +1924,16 @@ ffs_snapshot_unmount(mp)
|
||||
VI_LOCK(devvp);
|
||||
}
|
||||
}
|
||||
if (devvp->v_rdev->si_snapblklist != NULL) {
|
||||
FREE(devvp->v_rdev->si_snapblklist, M_UFSMNT);
|
||||
devvp->v_rdev->si_snapblklist = NULL;
|
||||
devvp->v_rdev->si_snaplistsize = 0;
|
||||
}
|
||||
if (lkp != NULL) {
|
||||
lockdestroy(lkp);
|
||||
FREE(lkp, M_UFSMNT);
|
||||
if (sn->sn_blklist != NULL) {
|
||||
FREE(sn->sn_blklist, M_UFSMNT);
|
||||
sn->sn_blklist = NULL;
|
||||
sn->sn_listsize = 0;
|
||||
}
|
||||
lockdestroy(&sn->sn_lock);
|
||||
free(sn, M_UFSMNT);
|
||||
ASSERT_VOP_LOCKED(devvp, "ffs_snapshot_unmount");
|
||||
devvp->v_rdev->si_copyonwrite = 0;
|
||||
devvp->v_rdev->si_snapdata = NULL;
|
||||
devvp->v_vflag &= ~VV_COPYONWRITE;
|
||||
VI_UNLOCK(devvp);
|
||||
}
|
||||
@ -1930,7 +1947,7 @@ ffs_copyonwrite(devvp, bp)
|
||||
struct vnode *devvp;
|
||||
struct buf *bp;
|
||||
{
|
||||
struct snaphead *snaphead;
|
||||
struct snapdata *sn;
|
||||
struct buf *ibp, *cbp, *savedcbp = 0;
|
||||
struct thread *td = curthread;
|
||||
struct fs *fs;
|
||||
@ -1946,12 +1963,12 @@ ffs_copyonwrite(devvp, bp)
|
||||
* By doing this check we avoid several potential deadlocks.
|
||||
*/
|
||||
VI_LOCK(devvp);
|
||||
snaphead = &devvp->v_rdev->si_snapshots;
|
||||
ip = TAILQ_FIRST(snaphead);
|
||||
sn = devvp->v_rdev->si_snapdata;
|
||||
ip = TAILQ_FIRST(&sn->sn_head);
|
||||
fs = ip->i_fs;
|
||||
lbn = fragstoblks(fs, dbtofsb(fs, bp->b_blkno));
|
||||
snapblklist = devvp->v_rdev->si_snapblklist;
|
||||
upper = devvp->v_rdev->si_snaplistsize - 1;
|
||||
snapblklist = sn->sn_blklist;
|
||||
upper = sn->sn_listsize - 1;
|
||||
lower = 1;
|
||||
while (lower <= upper) {
|
||||
mid = (lower + upper) / 2;
|
||||
@ -1970,7 +1987,7 @@ ffs_copyonwrite(devvp, bp)
|
||||
* Not in the precomputed list, so check the snapshots.
|
||||
*/
|
||||
retry:
|
||||
TAILQ_FOREACH(ip, snaphead, i_nextsnap) {
|
||||
TAILQ_FOREACH(ip, &sn->sn_head, i_nextsnap) {
|
||||
vp = ITOV(ip);
|
||||
/*
|
||||
* We ensure that everything of our own that needs to be
|
||||
@ -2069,7 +2086,7 @@ ffs_copyonwrite(devvp, bp)
|
||||
/*
|
||||
* Otherwise, read the old block contents into the buffer.
|
||||
*/
|
||||
if ((error = readblock(cbp, lbn)) != 0) {
|
||||
if ((error = readblock(vp, cbp, lbn)) != 0) {
|
||||
bzero(cbp->b_data, fs->fs_bsize);
|
||||
bawrite(cbp);
|
||||
if (dopersistence && ip->i_effnlink > 0)
|
||||
@ -2101,14 +2118,15 @@ ffs_copyonwrite(devvp, bp)
|
||||
* Much of this boiler-plate comes from bwrite().
|
||||
*/
|
||||
static int
|
||||
readblock(bp, lbn)
|
||||
readblock(vp, bp, lbn)
|
||||
struct vnode *vp;
|
||||
struct buf *bp;
|
||||
ufs2_daddr_t lbn;
|
||||
{
|
||||
struct uio auio;
|
||||
struct iovec aiov;
|
||||
struct thread *td = curthread;
|
||||
struct inode *ip = VTOI(bp->b_vp);
|
||||
struct inode *ip = VTOI(vp);
|
||||
|
||||
aiov.iov_base = bp->b_data;
|
||||
aiov.iov_len = bp->b_bcount;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user