Patch "NFSD: discard fh_locked flag and fh_lock/fh_unlock" has been added to the 5.10-stable tree

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This is a note to let you know that I've just added the patch titled

    NFSD: discard fh_locked flag and fh_lock/fh_unlock

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     nfsd-discard-fh_locked-flag-and-fh_lock-fh_unlock.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit d5718890a84cf21070b1287fc4f3cae553f21585
Author: NeilBrown <neilb@xxxxxxx>
Date:   Tue Jul 26 16:45:30 2022 +1000

    NFSD: discard fh_locked flag and fh_lock/fh_unlock
    
    [ Upstream commit dd8dd403d7b223cc77ee89d8d09caf045e90e648 ]
    
    As all inode locking is now fully balanced, fh_put() does not need to
    call fh_unlock().
    fh_lock() and fh_unlock() are no longer used, so discard them.
    These are the only real users of ->fh_locked, so discard that too.
    
    Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
    Signed-off-by: NeilBrown <neilb@xxxxxxx>
    Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index cc680deecafa7..db8d62632a5be 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -547,7 +547,7 @@ fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
 	if (ref_fh == fhp)
 		fh_put(ref_fh);
 
-	if (fhp->fh_locked || fhp->fh_dentry) {
+	if (fhp->fh_dentry) {
 		printk(KERN_ERR "fh_compose: fh %pd2 not initialized!\n",
 		       dentry);
 	}
@@ -698,7 +698,6 @@ fh_put(struct svc_fh *fhp)
 	struct dentry * dentry = fhp->fh_dentry;
 	struct svc_export * exp = fhp->fh_export;
 	if (dentry) {
-		fh_unlock(fhp);
 		fhp->fh_dentry = NULL;
 		dput(dentry);
 		fh_clear_pre_post_attrs(fhp);
diff --git a/fs/nfsd/nfsfh.h b/fs/nfsd/nfsfh.h
index 28a4f9a94e2c8..c3ae6414fc5cf 100644
--- a/fs/nfsd/nfsfh.h
+++ b/fs/nfsd/nfsfh.h
@@ -81,7 +81,6 @@ typedef struct svc_fh {
 	struct dentry *		fh_dentry;	/* validated dentry */
 	struct svc_export *	fh_export;	/* export pointer */
 
-	bool			fh_locked;	/* inode locked by us */
 	bool			fh_want_write;	/* remount protection taken */
 	bool			fh_no_wcc;	/* no wcc data needed */
 	bool			fh_no_atomic_attr;
@@ -93,7 +92,7 @@ typedef struct svc_fh {
 	bool			fh_post_saved;	/* post-op attrs saved */
 	bool			fh_pre_saved;	/* pre-op attrs saved */
 
-	/* Pre-op attributes saved during fh_lock */
+	/* Pre-op attributes saved when inode is locked */
 	__u64			fh_pre_size;	/* size before operation */
 	struct timespec64	fh_pre_mtime;	/* mtime before oper */
 	struct timespec64	fh_pre_ctime;	/* ctime before oper */
@@ -103,7 +102,7 @@ typedef struct svc_fh {
 	 */
 	u64			fh_pre_change;
 
-	/* Post-op attributes saved in fh_unlock */
+	/* Post-op attributes saved in fh_fill_post_attrs() */
 	struct kstat		fh_post_attr;	/* full attrs after operation */
 	u64			fh_post_change; /* nfsv4 change; see above */
 } svc_fh;
@@ -223,8 +222,8 @@ void	fh_put(struct svc_fh *);
 static __inline__ struct svc_fh *
 fh_copy(struct svc_fh *dst, struct svc_fh *src)
 {
-	WARN_ON(src->fh_dentry || src->fh_locked);
-			
+	WARN_ON(src->fh_dentry);
+
 	*dst = *src;
 	return dst;
 }
@@ -323,51 +322,4 @@ static inline u64 nfsd4_change_attribute(struct kstat *stat,
 extern void fh_fill_pre_attrs(struct svc_fh *fhp);
 extern void fh_fill_post_attrs(struct svc_fh *fhp);
 extern void fh_fill_both_attrs(struct svc_fh *fhp);
-
-/*
- * Lock a file handle/inode
- * NOTE: both fh_lock and fh_unlock are done "by hand" in
- * vfs.c:nfsd_rename as it needs to grab 2 i_mutex's at once
- * so, any changes here should be reflected there.
- */
-
-static inline void
-fh_lock_nested(struct svc_fh *fhp, unsigned int subclass)
-{
-	struct dentry	*dentry = fhp->fh_dentry;
-	struct inode	*inode;
-
-	BUG_ON(!dentry);
-
-	if (fhp->fh_locked) {
-		printk(KERN_WARNING "fh_lock: %pd2 already locked!\n",
-			dentry);
-		return;
-	}
-
-	inode = d_inode(dentry);
-	inode_lock_nested(inode, subclass);
-	fh_fill_pre_attrs(fhp);
-	fhp->fh_locked = true;
-}
-
-static inline void
-fh_lock(struct svc_fh *fhp)
-{
-	fh_lock_nested(fhp, I_MUTEX_NORMAL);
-}
-
-/*
- * Unlock a file handle/inode
- */
-static inline void
-fh_unlock(struct svc_fh *fhp)
-{
-	if (fhp->fh_locked) {
-		fh_fill_post_attrs(fhp);
-		inode_unlock(d_inode(fhp->fh_dentry));
-		fhp->fh_locked = false;
-	}
-}
-
 #endif /* _LINUX_NFSD_NFSFH_H */
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 504a3ddfaf75b..5a7fee4ee2079 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1282,13 +1282,6 @@ nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	dirp = d_inode(dentry);
 
 	dchild = dget(resfhp->fh_dentry);
-	if (!fhp->fh_locked) {
-		WARN_ONCE(1, "nfsd_create: parent %pd2 not locked!\n",
-				dentry);
-		err = nfserr_io;
-		goto out;
-	}
-
 	err = nfsd_permission(rqstp, fhp->fh_export, dentry, NFSD_MAY_CREATE);
 	if (err)
 		goto out;
@@ -1656,10 +1649,7 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
 		goto out;
 	}
 
-	/* cannot use fh_lock as we need deadlock protective ordering
-	 * so do it by hand */
 	trap = lock_rename(tdentry, fdentry);
-	ffhp->fh_locked = tfhp->fh_locked = true;
 	fh_fill_pre_attrs(ffhp);
 	fh_fill_pre_attrs(tfhp);
 
@@ -1707,17 +1697,12 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
 	dput(odentry);
  out_nfserr:
 	err = nfserrno(host_err);
-	/*
-	 * We cannot rely on fh_unlock on the two filehandles,
-	 * as that would do the wrong thing if the two directories
-	 * were the same, so again we do it by hand.
-	 */
+
 	if (!close_cached) {
 		fh_fill_post_attrs(ffhp);
 		fh_fill_post_attrs(tfhp);
 	}
 	unlock_rename(tdentry, fdentry);
-	ffhp->fh_locked = tfhp->fh_locked = false;
 	fh_drop_write(ffhp);
 
 	/*




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