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afs: Fix afs_d_validate() to set the right directory version

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commit 40fc81027f892284ce31f8b6de1e497f5b47e71f upstream.

If a dentry's version is somewhere between invalid_before and the current
directory version, we should be setting it forward to the current version,
not backwards to the invalid_before version.  Note that we're only doing
this at all because dentry::d_fsdata isn't large enough on a 32-bit system.

Fix this by using a separate variable for invalid_before so that we don't
accidentally clobber the current dir version.

Fixes: a4ff7401fb ("afs: Keep track of invalid-before version for dentry coherency")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Howells 2020-04-11 08:50:45 +01:00 committed by Greg Kroah-Hartman
parent 8c3e4ba0fa
commit 42e343cf32
1 changed files with 3 additions and 3 deletions
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6
fs/afs/dir.c
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@ -1032,7 +1032,7 @@ static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
struct dentry *parent;
struct inode *inode;
struct key *key;
afs_dataversion_t dir_version;
afs_dataversion_t dir_version, invalid_before;
long de_version;
int ret;
@ -1084,8 +1084,8 @@ static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
if (de_version == (long)dir_version)
goto out_valid_noupdate;
dir_version = dir->invalid_before;
if (de_version - (long)dir_version >= 0)
invalid_before = dir->invalid_before;
if (de_version - (long)invalid_before >= 0)
goto out_valid;
_debug("dir modified");