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NFS: Also use readdir info to revalidate positive dentries

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If the fileid of the cached dentry fails to match that returned by
the readdir call, then we should also d_drop. Try to take into account the
fact that on NFSv4, readdir may return the "mounted_on_fileid" by looking
for submounts.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2007-01-16 10:09:44 -05:00
parent df1d5d23d3
commit ef75c7974b
1 changed files with 11 additions and 3 deletions
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14
fs/nfs/dir.c
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@ -1124,9 +1124,16 @@ static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc)
name.hash = full_name_hash(name.name, name.len);
dentry = d_lookup(parent, &name);
if (dentry != NULL) {
/* Is this a positive dentry? */
if (dentry->d_inode != NULL)
return dentry;
/* Is this a positive dentry that matches the readdir info? */
if (dentry->d_inode != NULL &&
(NFS_FILEID(dentry->d_inode) == entry->ino ||
d_mountpoint(dentry))) {
if (!desc->plus || entry->fh->size == 0)
return dentry;
if (nfs_compare_fh(NFS_FH(dentry->d_inode),
entry->fh) == 0)
goto out_renew;
}
/* No, so d_drop to allow one to be created */
d_drop(dentry);
dput(dentry);
@ -1152,6 +1159,7 @@ static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc)
dentry = alias;
}
out_renew:
nfs_renew_times(dentry);
nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
return dentry;