From 0997b173609b9229ece28941c118a2a9b278796e Mon Sep 17 00:00:00 2001
From: "J. Bruce Fields" <bfields@redhat.com>
Date: Wed, 2 Mar 2011 18:01:35 -0500
Subject: [PATCH] nfsd4: fix struct file leak
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Make sure we properly reference count the struct files that a lock
depends on, and release them when the lock stateid is released.
This fixes a major leak of struct files when using locking over nfsv4.
Cc: stable@kernel.org
Reported-by: Rick Koshi <nfs-bug-report@more-right-rudder.com>
Tested-by: Ivo Přikryl <prikryl@eurosat.cz>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
---
fs/nfsd/nfs4state.c | 32 +++++++++++++++++++++-----------
1 file changed, 21 insertions(+), 11 deletions(-)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 84d2dd327b2d..c26dc31fb943 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -397,6 +397,9 @@ static void unhash_generic_stateid(struct nfs4_stateid *stp)
static void free_generic_stateid(struct nfs4_stateid *stp)
{
+ int oflag = nfs4_access_bmap_to_omode(stp);
+
+ nfs4_file_put_access(stp->st_file, oflag);
put_nfs4_file(stp->st_file);
kmem_cache_free(stateid_slab, stp);
}
@@ -448,11 +451,8 @@ release_stateid_lockowners(struct nfs4_stateid *open_stp)
static void release_open_stateid(struct nfs4_stateid *stp)
{
- int oflag = nfs4_access_bmap_to_omode(stp);
-
unhash_generic_stateid(stp);
release_stateid_lockowners(stp);
- nfs4_file_put_access(stp->st_file, oflag);
free_generic_stateid(stp);
}
@@ -3734,6 +3734,7 @@ alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struc
stp->st_stateid.si_stateownerid = sop->so_id;
stp->st_stateid.si_fileid = fp->fi_id;
stp->st_stateid.si_generation = 0;
+ stp->st_access_bmap = 0;
stp->st_deny_bmap = open_stp->st_deny_bmap;
stp->st_openstp = open_stp;
@@ -3748,6 +3749,17 @@ check_lock_length(u64 offset, u64 length)
LOFF_OVERFLOW(offset, length)));
}
+static void get_lock_access(struct nfs4_stateid *lock_stp, u32 access)
+{
+ struct nfs4_file *fp = lock_stp->st_file;
+ int oflag = nfs4_access_to_omode(access);
+
+ if (test_bit(access, &lock_stp->st_access_bmap))
+ return;
+ nfs4_file_get_access(fp, oflag);
+ __set_bit(access, &lock_stp->st_access_bmap);
+}
+
/*
* LOCK operation
*/
@@ -3845,18 +3857,16 @@ nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
switch (lock->lk_type) {
case NFS4_READ_LT:
case NFS4_READW_LT:
- if (find_readable_file(lock_stp->st_file)) {
- nfs4_get_vfs_file(rqstp, fp, &cstate->current_fh, NFS4_SHARE_ACCESS_READ);
- filp = find_readable_file(lock_stp->st_file);
- }
+ filp = find_readable_file(lock_stp->st_file);
+ if (filp)
+ get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
file_lock.fl_type = F_RDLCK;
break;
case NFS4_WRITE_LT:
case NFS4_WRITEW_LT:
- if (find_writeable_file(lock_stp->st_file)) {
- nfs4_get_vfs_file(rqstp, fp, &cstate->current_fh, NFS4_SHARE_ACCESS_WRITE);
- filp = find_writeable_file(lock_stp->st_file);
- }
+ filp = find_writeable_file(lock_stp->st_file);
+ if (filp)
+ get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
file_lock.fl_type = F_WRLCK;
break;
default: