afs: Fix afs_d_validate() to set the right directory version
commit40fc81027f
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>
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@ -1032,7 +1032,7 @@ static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
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struct dentry *parent;
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struct inode *inode;
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struct key *key;
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afs_dataversion_t dir_version;
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afs_dataversion_t dir_version, invalid_before;
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long de_version;
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int ret;
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@ -1084,8 +1084,8 @@ static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
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if (de_version == (long)dir_version)
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goto out_valid_noupdate;
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dir_version = dir->invalid_before;
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if (de_version - (long)dir_version >= 0)
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invalid_before = dir->invalid_before;
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if (de_version - (long)invalid_before >= 0)
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goto out_valid;
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_debug("dir modified");
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