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cifs: check the timestamp for the cached dirent when deciding on revalidate 

Improves directory metadata caching

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Ronnie Sahlberg 2021-03-09 09:07:35 +10:00 committed by Steve French
parent ed8561fa1d
commit f6d2353a50
1 changed files with 12 additions and 0 deletions
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12
fs/cifs/inode.c
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@ -2193,6 +2193,8 @@ cifs_dentry_needs_reval(struct dentry *dentry)
struct inode *inode = d_inode(dentry);
struct cifsInodeInfo *cifs_i = CIFS_I(inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
struct cached_fid *cfid = NULL;
if (cifs_i->time == 0)
return true;
@ -2203,6 +2205,16 @@ cifs_dentry_needs_reval(struct dentry *dentry)
if (!lookupCacheEnabled)
return true;
if (!open_cached_dir_by_dentry(tcon, dentry->d_parent, &cfid)) {
mutex_lock(&cfid->fid_mutex);
if (cfid->time && cifs_i->time > cfid->time) {
mutex_unlock(&cfid->fid_mutex);
close_cached_dir(cfid);
return false;
}
mutex_unlock(&cfid->fid_mutex);
close_cached_dir(cfid);
}
/*
* depending on inode type, check if attribute caching disabled for
* files or directories