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staging/lustre/llite: Restore proper opencache operations 

Mark dentries that came to us via NFS in a special way so that
we can tell them apart during open and activate open cache
(we really don't want to do open/close RPC for every NFS IO).

This became needed since dentry revlidate no longer reimplements
any RPCs for lookup, and as such if a dentry is valid,
ll_revalidate_dentry returns 1 and ll_lookup_it() is never visited
during opens, we get straght into ll_file_open() without a valid
intent/RPC. This used to be only true for NFS, so opencache was
engaged needlessly, and it carries a cost of it's own if there is
in fact no repetitive file opening-closing going on

Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Reviewed-on: http://review.whamcloud.com/20354
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-8019
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Li Xi <lixi@ddn.com>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oleg Drokin 2016-06-20 16:55:45 -04:00 committed by Greg Kroah-Hartman
parent c681528a2b
commit 6dad4d8903
3 changed files with 32 additions and 1 deletions
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12
drivers/staging/lustre/lustre/llite/file.c
View File

@ -399,7 +399,19 @@ static int ll_intent_file_open(struct dentry *dentry, void *lmm,
* parameters. No need for the open lock
*/
if (!lmm && lmmsize == 0) {
struct ll_dentry_data *ldd = ll_d2d(dentry);
/*
* If we came via ll_iget_for_nfs, then we need to request
* struct ll_dentry_data *ldd = ll_d2d(file->f_dentry);
*
* NB: when ldd is NULL, it must have come via normal
* lookup path only, since ll_iget_for_nfs always calls
* ll_d_init().
*/
if (ldd && ldd->lld_nfs_dentry) {
ldd->lld_nfs_dentry = 0;
itp->it_flags |= MDS_OPEN_LOCK;
}
if (itp->it_flags & FMODE_WRITE)
opc = LUSTRE_OPC_CREATE;
}

1
drivers/staging/lustre/lustre/llite/llite_internal.h
View File

@ -64,6 +64,7 @@ struct ll_dentry_data {
struct lookup_intent *lld_it;
unsigned int lld_sa_generation;
unsigned int lld_invalid:1;
unsigned int lld_nfs_dentry:1;
struct rcu_head lld_rcu_head;
};

18
drivers/staging/lustre/lustre/llite/llite_nfs.c
View File

@ -168,6 +168,24 @@ ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *paren
/* N.B. d_obtain_alias() drops inode ref on error */
result = d_obtain_alias(inode);
if (!IS_ERR(result)) {
int rc;
rc = ll_d_init(result);
if (rc < 0) {
dput(result);
result = ERR_PTR(rc);
} else {
struct ll_dentry_data *ldd = ll_d2d(result);
/*
* Need to signal to the ll_intent_file_open that
* we came from NFS and so opencache needs to be
* enabled for this one
*/
ldd->lld_nfs_dentry = 1;
}
}
return result;
}