source:
trunk/server/common/patches/openafs-d_splice_alias-reference.patch
@
2659
Last change on this file since 2659 was 2659, checked in by andersk, 10 years ago | |
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File size: 2.7 KB |
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acinclude.m4
From b1f23baecb2de72b44cda8bba27615c012a445f1 Mon Sep 17 00:00:00 2001 From: Marc Dionne <marc.dionne@your-file-system.com> Date: Thu, 18 Dec 2014 08:43:22 -0500 Subject: [PATCH] Linux: d_splice_alias may drop inode reference on error d_splice_alias now drops the inode reference on error, so we need to grab an extra one to make sure that the inode doesn't go away, and release it when done if there was no error. For kernels that may not drop the reference, provide an additional iput() within an ifdef. This could be hooked up to a configure option to allow building a module for a kernel that is known not to drop the reference on error. That hook is not provided here. Affected kernels should be the early 3.17 ones (3.17 - 3.17.2); 3.16 and older kernels should not return errors here. Change-Id: Id1786ac2227b4d8e0ae801fe59c15a0ecd975bed --- acinclude.m4 | 3 +++ src/afs/LINUX/osi_vnodeops.c | 29 ++++++++++++++++++++++++++--- 2 files changed, 29 insertions(+), 3 deletions(-) diff --git a/acinclude.m4 b/acinclude.m4 index 96adde0..19f7092 100644
a b case $AFS_SYSNAME in *_linux* | *_umlinux*) 984 984 AC_CHECK_LINUX_FUNC([hlist_unhashed], 985 985 [#include <linux/list.h>], 986 986 [hlist_unhashed(0);]) 987 AC_CHECK_LINUX_FUNC([ihold], 988 [#include <linux/fs.h>], 989 [ihold(NULL);]) 987 990 AC_CHECK_LINUX_FUNC([i_size_read], 988 991 [#include <linux/fs.h>], 989 992 [i_size_read(NULL);]) -
src/afs/LINUX/osi_vnodeops.c
diff --git a/src/afs/LINUX/osi_vnodeops.c b/src/afs/LINUX/osi_vnodeops.c index b2ab9d5..cedfef6 100644
a b afs_linux_lookup(struct inode *dip, struct dentry *dp) 1612 1612 ip->i_flags |= S_AUTOMOUNT; 1613 1613 #endif 1614 1614 } 1615 /* 1616 * Take an extra reference so the inode doesn't go away if 1617 * d_splice_alias drops our reference on error. 1618 */ 1619 if (ip) 1620 #ifdef HAVE_LINUX_IHOLD 1621 ihold(ip); 1622 #else 1623 igrab(ip); 1624 #endif 1625 1615 1626 newdp = d_splice_alias(ip, dp); 1616 1627 1617 1628 done: … … afs_linux_lookup(struct inode *dip, struct dentry *dp) 1625 1636 * d_splice_alias can return an error (EIO) if there is an existing 1626 1637 * connected directory alias for this dentry. 1627 1638 */ 1628 if (!IS_ERR(newdp)) 1639 if (!IS_ERR(newdp)) { 1640 iput(ip); 1629 1641 return newdp; 1630 else {1642 } else { 1631 1643 d_add(dp, ip); 1644 /* 1645 * Depending on the kernel version, d_splice_alias may or may 1646 * not drop the inode reference on error. If it didn't, do it 1647 * here. 1648 */ 1649 #if defined(D_SPLICE_ALIAS_LEAK_ON_ERROR) 1650 iput(ip); 1651 #endif 1632 1652 return NULL; 1633 1653 } 1634 } else 1654 } else { 1655 if (ip) 1656 iput(ip); 1635 1657 return ERR_PTR(afs_convert_code(code)); 1658 } 1636 1659 } 1637 1660 1638 1661 static int
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