nfsd4: fix file leak on open_downgrade

Stateid's hold a read reference for a read open, a write reference for a
write open, and an additional one of each for each read+write open.  The
latter wasn't getting put on a downgrade, so something like:

	open RW
	open R
	downgrade to R

was resulting in a file leak.

Also fix an imbalance in an error path.

Regression from 7d94784293096c0a46897acdb83be5abd9278ece "nfsd4: fix
downgrade/lock logic".

Cc: stable@kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 8 insertions, 23 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 5e8806a9ef4e..e252aa79c94f 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2336,15 +2336,6 @@ out:
         return ret;
 }
 
-static inline void
-nfs4_file_downgrade(struct nfs4_file *fp, unsigned int share_access)
-{
-        if (share_access & NFS4_SHARE_ACCESS_WRITE)
-                nfs4_file_put_access(fp, O_WRONLY);
-        if (share_access & NFS4_SHARE_ACCESS_READ)
-                nfs4_file_put_access(fp, O_RDONLY);
-}
-
 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
 {
         /* We're assuming the state code never drops its reference
@@ -2625,7 +2616,7 @@ nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *c
         status = nfsd4_truncate(rqstp, cur_fh, open);
         if (status) {
                 if (new_access) {
-                        int oflag = nfs4_access_to_omode(new_access);
+                        int oflag = nfs4_access_to_omode(op_share_access);
                         nfs4_file_put_access(fp, oflag);
                 }
                 return status;
@@ -3489,18 +3480,15 @@ out:
         return status;
 }
 
-
-/*
- * unset all bits in union bitmap (bmap) that
- * do not exist in share (from successful OPEN_DOWNGRADE)
- */
-static void
-reset_union_bmap_access(unsigned long access, unsigned long *bmap)
+static inline void nfs4_file_downgrade(struct nfs4_stateid *stp, unsigned int to_access)
 {
         int i;
+
         for (i = 1; i < 4; i++) {
-                if ((i & access) != i)
-                        __clear_bit(i, bmap);
+                if (test_bit(i, &stp->st_access_bmap) && !(i & to_access)) {
+                        nfs4_file_put_access(stp->st_file, i);
+                        __clear_bit(i, &stp->st_access_bmap);
+                }
         }
 }
 
@@ -3521,7 +3509,6 @@ nfsd4_open_downgrade(struct svc_rqst *rqstp,
 {
         __be32 status;
         struct nfs4_stateid *stp;
-        unsigned int share_access;
 
         dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n", 
                         (int)cstate->current_fh.fh_dentry->d_name.len,
@@ -3550,10 +3537,8 @@ nfsd4_open_downgrade(struct svc_rqst *rqstp,
                         stp->st_deny_bmap, od->od_share_deny);
                 goto out;
         }
-        set_access(&share_access, stp->st_access_bmap);
-        nfs4_file_downgrade(stp->st_file, share_access & ~od->od_share_access);
+        nfs4_file_downgrade(stp, od->od_share_access);
 
-        reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
         reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
 
         update_stateid(&stp->st_stateid);