[src/trunk]: src/sys fix the UFS2 extattr truncate code to play nice with wapbl.

[chs <chs%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/eb0ceb990bdb
branches:  trunk
changeset: 936570:eb0ceb990bdb
user:      chs <chs%NetBSD.org@localhost>
date:      Fri Jul 31 04:07:30 2020 +0000

description:
fix the UFS2 extattr truncate code to play nice with wapbl.
also, rather than pull in the FreeBSD V_NORMAL/V_ALT flags to
vinvalbuf() and the buf b_xflags field and BX_ALTDATA flag,
add a binvalbuf() function to invalid a specific buffer
and use that to invalidate the two possible exattr bufs
during IO_EXT truncations.

diffstat:

 sys/kern/vfs_bio.c      |  34 ++++++++++++++++++++++++++++++++--
 sys/sys/buf.h           |   3 ++-
 sys/ufs/ffs/ffs_inode.c |  22 +++++++++++++++-------
 3 files changed, 49 insertions(+), 10 deletions(-)

diffs (147 lines):

diff -r 1022eca47466 -r eb0ceb990bdb sys/kern/vfs_bio.c
--- a/sys/kern/vfs_bio.c        Fri Jul 31 03:35:05 2020 +0000
+++ b/sys/kern/vfs_bio.c        Fri Jul 31 04:07:30 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: vfs_bio.c,v 1.296 2020/06/11 19:20:46 ad Exp $ */
+/*     $NetBSD: vfs_bio.c,v 1.297 2020/07/31 04:07:30 chs Exp $        */
 
 /*-
  * Copyright (c) 2007, 2008, 2009, 2019, 2020 The NetBSD Foundation, Inc.
@@ -123,7 +123,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: vfs_bio.c,v 1.296 2020/06/11 19:20:46 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vfs_bio.c,v 1.297 2020/07/31 04:07:30 chs Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_bufcache.h"
@@ -1516,6 +1516,36 @@
 }
 
 /*
+ * Invalidate the specified buffer if it exists.
+ */
+void
+binvalbuf(struct vnode *vp, daddr_t blkno)
+{
+       buf_t *bp;
+       int err;
+
+       mutex_enter(&bufcache_lock);
+
+ loop:
+       bp = incore(vp, blkno);
+       if (bp != NULL) {
+               err = bbusy(bp, 0, 0, NULL);
+               if (err == EPASSTHROUGH)
+                       goto loop;
+               bremfree(bp);
+               if (ISSET(bp->b_oflags, BO_DELWRI)) {
+                       SET(bp->b_cflags, BC_NOCACHE);
+                       mutex_exit(&bufcache_lock);
+                       bwrite(bp);
+               } else {
+                       brelsel(bp, BC_INVAL);
+                       mutex_exit(&bufcache_lock);
+               }
+       } else
+               mutex_exit(&bufcache_lock);
+}
+
+/*
  * Attempt to free an aged buffer off the queues.
  * Called with queue lock held.
  * Returns the amount of buffer memory freed.
diff -r 1022eca47466 -r eb0ceb990bdb sys/sys/buf.h
--- a/sys/sys/buf.h     Fri Jul 31 03:35:05 2020 +0000
+++ b/sys/sys/buf.h     Fri Jul 31 04:07:30 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: buf.h,v 1.133 2020/04/20 21:39:05 ad Exp $ */
+/*     $NetBSD: buf.h,v 1.134 2020/07/31 04:07:30 chs Exp $ */
 
 /*-
  * Copyright (c) 1999, 2000, 2007, 2008 The NetBSD Foundation, Inc.
@@ -287,6 +287,7 @@
 int    allocbuf(buf_t *, int, int);
 void   brelsel(buf_t *, int);
 void   brelse(buf_t *, int);
+void   binvalbuf(struct vnode *, daddr_t);
 
 /*
  * So-far indeterminate ops that might belong to either
diff -r 1022eca47466 -r eb0ceb990bdb sys/ufs/ffs/ffs_inode.c
--- a/sys/ufs/ffs/ffs_inode.c   Fri Jul 31 03:35:05 2020 +0000
+++ b/sys/ufs/ffs/ffs_inode.c   Fri Jul 31 04:07:30 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ffs_inode.c,v 1.130 2020/07/26 00:21:24 chs Exp $      */
+/*     $NetBSD: ffs_inode.c,v 1.131 2020/07/31 04:07:30 chs Exp $      */
 
 /*-
  * Copyright (c) 2008 The NetBSD Foundation, Inc.
@@ -61,7 +61,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ffs_inode.c,v 1.130 2020/07/26 00:21:24 chs Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ffs_inode.c,v 1.131 2020/07/31 04:07:30 chs Exp $");
 
 #if defined(_KERNEL_OPT)
 #include "opt_ffs.h"
@@ -208,6 +208,7 @@
 {
        daddr_t lastblock;
        struct inode *oip = VTOI(ovp);
+       struct mount *omp = ovp->v_mount;
        daddr_t bn, lastiblock[UFS_NIADDR], indir_lbn[UFS_NIADDR];
        daddr_t blks[UFS_NDADDR + UFS_NIADDR], oldblks[UFS_NDADDR + UFS_NIADDR];
        struct fs *fs;
@@ -220,6 +221,8 @@
        int sync;
        struct ufsmount *ump = oip->i_ump;
        void *dcookie;
+       long bsize;
+       bool wapbl = omp->mnt_wapbl != NULL;
 
        UFS_WAPBL_JLOCK_ASSERT(ump->um_mountp);
 
@@ -255,11 +258,11 @@
 #ifdef QUOTA
                        (void) chkdq(oip, -extblocks, NOCRED, FORCE);
 #endif
-                       vinvalbuf(ovp, 0, cred, curlwp, 0, 0);
                        osize = oip->i_din2->di_extsize;
                        oip->i_din2->di_blocks -= extblocks;
                        oip->i_din2->di_extsize = 0;
                        for (i = 0; i < UFS_NXADDR; i++) {
+                               binvalbuf(ovp, -1 - i);
                                oldblks[i] = oip->i_din2->di_extb[i];
                                oip->i_din2->di_extb[i] = 0;
                        }
@@ -269,8 +272,15 @@
                        for (i = 0; i < UFS_NXADDR; i++) {
                                if (oldblks[i] == 0)
                                        continue;
-                               ffs_blkfree(fs, oip->i_devvp, oldblks[i],
-                                   ffs_sblksize(fs, osize, i), oip->i_number);
+                               bsize = ffs_sblksize(fs, osize, i);
+                               if (wapbl) {
+                                       error = UFS_WAPBL_REGISTER_DEALLOCATION(omp,
+                                           FFS_FSBTODB(fs, oldblks[i]), bsize, NULL);
+                                       if (error)
+                                               return error;
+                               } else 
+                                       ffs_blkfree(fs, oip->i_devvp, oldblks[i],
+                                           bsize, oip->i_number);
                        }
                        extblocks = 0;
                }
@@ -501,8 +511,6 @@
         * All whole direct blocks or frags.
         */
        for (i = UFS_NDADDR - 1; i > lastblock; i--) {
-               long bsize;
-
                bn = ffs_getdb(fs, oip, i);
                if (bn == 0)
                        continue;