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staging/lustre/llite: changes to avoid cache corruption

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ll_find_alias is responsible for getting alias for inode
which can be reused. Directories are assumed to have unique
alias, where in case of non-directories there can be multiple
aliases. In case of lustre there can be two type of aliases
i.e. discon_alias and invalid_alias. Usage of discon_alias in
case of non-directories may corrupt dcache and leads to kernel
crash. Changes made to avoid use of discon_alias in case of
non-directories.

Seagate-bug-id: MRP-2739, MRP-3601
Signed-off-by: Lokesh Nagappa Jaliminche <lokesh.jaliminche@seagate.com>
Reviewed-by: Ujjwal Lanjewar <ujjwal.lanjewar@seagate.com>
Reviewed-by: Ashish Purkar <ashish.purkar@seagate.com>
Reviewed-by: Andrew Perepechko <andrew.perepechko@seagate.com>
Tested-by: Parinay Vijayprakash Kondekar <parinay.kondekar@seagate.com>
Reviewed-on: http://review.whamcloud.com/17732
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-7613
Reviewed-by: Niu Yawei <yawei.niu@intel.com>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lokesh Nagappa Jaliminche 2016-08-24 11:11:56 -04:00 committed by Greg Kroah-Hartman
parent 8d897d2540
commit f736814418
1 changed files with 2 additions and 1 deletions
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3
drivers/staging/lustre/lustre/llite/namei.c
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@ -363,7 +363,8 @@ static struct dentry *ll_find_alias(struct inode *inode, struct dentry *dentry)
LASSERT(alias != dentry);
spin_lock(&alias->d_lock);
if (alias->d_flags & DCACHE_DISCONNECTED)
if ((alias->d_flags & DCACHE_DISCONNECTED) &&
S_ISDIR(inode->i_mode))
/* LASSERT(last_discon == NULL); LU-405, bz 20055 */
discon_alias = alias;
else if (alias->d_parent == dentry->d_parent &&