Module Name: src
Committed By: kardel
Date: Sun Apr 14 15:55:24 UTC 2019
Modified Files:
src/sys/ufs/ffs: ffs_alloc.c
Log Message:
PR/53990, PR/52380, PR/52102: UFS2 cylinder group inode allocation botch
Fix rare allocation botch in ffs_nodealloccg().
Conditions:
a) less than
#_of_initialized_inodes(cg->cg_initediblk)
- inodes_per_filesystem_block
are allocated in the cylinder group
b) cg->cg_irotor points to a uninterupted run of
allocated inodes in the inode bitmap up to the
end of dynamically initialized inodes
(cg->cg_initediblk)
In this case the next inode after this run was returned
without initializing the respective inode block. As the
block is not initialized these inodes could trigger panics
on inode consistency due to old (uninitialized) disk data.
In very rare cases data loss could occur when
the uninitialized inode block is initialized via the
normal mechanism.
Further conditions to occur after the above:
c) no panic
d) no (forced) fsck
e) and more than cg->cg_initediblk - inodes_per_filesystem_block
allocated inodes.
Fix:
Always insure allocation always in initialized inode range
extending the initialized inode range as needed.
Add KASSERTMSG() safeguards.
ok hannken@
To generate a diff of this commit:
cvs rdiff -u -r1.163 -r1.164 src/sys/ufs/ffs/ffs_alloc.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/ufs/ffs/ffs_alloc.c
diff -u src/sys/ufs/ffs/ffs_alloc.c:1.163 src/sys/ufs/ffs/ffs_alloc.c:1.164
--- src/sys/ufs/ffs/ffs_alloc.c:1.163 Mon Dec 10 20:48:34 2018
+++ src/sys/ufs/ffs/ffs_alloc.c Sun Apr 14 15:55:24 2019
@@ -1,4 +1,4 @@
-/* $NetBSD: ffs_alloc.c,v 1.163 2018/12/10 20:48:34 jdolecek Exp $ */
+/* $NetBSD: ffs_alloc.c,v 1.164 2019/04/14 15:55:24 kardel Exp $ */
/*-
* Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
@@ -70,7 +70,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ffs_alloc.c,v 1.163 2018/12/10 20:48:34 jdolecek Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ffs_alloc.c,v 1.164 2019/04/14 15:55:24 kardel Exp $");
#if defined(_KERNEL_OPT)
#include "opt_ffs.h"
@@ -1259,7 +1259,7 @@ ffs_nodealloccg(struct inode *ip, int cg
struct buf *bp, *ibp;
u_int8_t *inosused;
int error, start, len, loc, map, i;
- int32_t initediblk;
+ int32_t initediblk, maxiblk, irotor;
daddr_t nalloc;
struct ufs2_dinode *dp2;
const int needswap = UFS_FSNEEDSWAP(fs);
@@ -1271,7 +1271,13 @@ ffs_nodealloccg(struct inode *ip, int cg
return (0);
mutex_exit(&ump->um_lock);
ibp = NULL;
- initediblk = -1;
+ if (fs->fs_magic == FS_UFS2_MAGIC) {
+ initediblk = -1;
+ } else {
+ initediblk = fs->fs_ipg;
+ }
+ maxiblk = initediblk;
+
retry:
error = bread(ip->i_devvp, FFS_FSBTODB(fs, cgtod(fs, cg)),
(int)fs->fs_cgsize, B_MODIFY, &bp);
@@ -1291,7 +1297,8 @@ retry:
* Check to see if we need to initialize more inodes.
*/
if (fs->fs_magic == FS_UFS2_MAGIC && ibp == NULL) {
- initediblk = ufs_rw32(cgp->cg_initediblk, needswap);
+ initediblk = ufs_rw32(cgp->cg_initediblk, needswap);
+ maxiblk = initediblk;
nalloc = fs->fs_ipg - ufs_rw32(cgp->cg_cs.cs_nifree, needswap);
if (nalloc + FFS_INOPB(fs) > initediblk &&
initediblk < ufs_rw32(cgp->cg_niblk, needswap)) {
@@ -1307,6 +1314,9 @@ retry:
FFS_NOBLK, fs->fs_bsize, false, &ibp);
if (error)
goto fail;
+
+ maxiblk += FFS_INOPB(fs);
+
goto retry;
}
}
@@ -1316,14 +1326,22 @@ retry:
(fs->fs_old_flags & FS_FLAGS_UPDATED))
cgp->cg_time = ufs_rw64(time_second, needswap);
inosused = cg_inosused(cgp, needswap);
+
if (ipref) {
ipref %= fs->fs_ipg;
- if (isclr(inosused, ipref))
+ /* safeguard to stay in (to be) allocated range */
+ if (ipref < maxiblk && isclr(inosused, ipref))
goto gotit;
}
- start = ufs_rw32(cgp->cg_irotor, needswap) / NBBY;
- len = howmany(fs->fs_ipg - ufs_rw32(cgp->cg_irotor, needswap),
- NBBY);
+
+ irotor = ufs_rw32(cgp->cg_irotor, needswap);
+
+ KASSERTMSG(irotor < initediblk, "%s: allocation botch: cg=%d, irotor %d"
+ " out of bounds, initediblk=%d",
+ __func__, cg, irotor, initediblk);
+
+ start = irotor / NBBY;
+ len = howmany(maxiblk - irotor, NBBY);
loc = skpc(0xff, len, &inosused[start]);
if (loc == 0) {
len = start + 1;
@@ -1341,9 +1359,17 @@ retry:
if (map == 0) {
panic("%s: block not in map: fs=%s", __func__, fs->fs_fsmnt);
}
+
ipref = i * NBBY + ffs(map) - 1;
+
cgp->cg_irotor = ufs_rw32(ipref, needswap);
+
gotit:
+ KASSERTMSG(ipref < maxiblk, "%s: allocation botch: cg=%d attempt to "
+ "allocate inode index %d beyond max allocated index %d"
+ " of %d inodes/cg",
+ __func__, cg, (int)ipref, maxiblk, cgp->cg_niblk);
+
UFS_WAPBL_REGISTER_INODE(ip->i_ump->um_mountp, cg * fs->fs_ipg + ipref,
mode);
/*
