linux-kernel - [PATCH v2 1/5] orangefs: fix request

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Message-Id: <20181019122049.27121-1-mszeredi@redhat.com>
Date:   Fri, 19 Oct 2018 14:20:45 +0200
From:   Miklos Szeredi <mszeredi@...hat.com>
To:     linux-fsdevel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        David Howells <dhowells@...hat.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Andreas Dilger <adilger@...ger.ca>,
        Florian Weimer <fw@...eb.enyo.de>,
        Amir Goldstein <amir73il@...il.com>,
        Mike Marshall <hubcap@...ibond.com>
Subject: [PATCH v2 1/5] orangefs: fix request_mask misuse

Orangefs only handles STATX_BASIC_STATS in its getattr implementation, so
mask off all other flags.  Not doing so results in statx(2) forcing a
refresh of cached attributes on any other requested flag (i.e. STATX_BTIME
currently) due to the following test in orangefs_inode_getattr():

  (request_mask & orangefs_inode->getattr_mask) == request_mask

Also clean up gratuitous uses of STATX_ALL.

Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
Reviewed-by: Martin Brandenburg <martin@...ibond.com>
Cc: Mike Marshall <hubcap@...ibond.com>
---
 fs/orangefs/inode.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/orangefs/inode.c b/fs/orangefs/inode.c
index 31932879b716..bd7f15a831dc 100644
--- a/fs/orangefs/inode.c
+++ b/fs/orangefs/inode.c
@@ -256,7 +256,8 @@ int orangefs_getattr(const struct path *path, struct kstat *stat,
 		     "orangefs_getattr: called on %pd\n",
 		     path->dentry);
 
-	ret = orangefs_inode_getattr(inode, 0, 0, request_mask);
+	ret = orangefs_inode_getattr(inode, 0, 0,
+				     request_mask & STATX_BASIC_STATS);
 	if (ret == 0) {
 		generic_fillattr(inode, stat);
 
@@ -408,7 +409,7 @@ struct inode *orangefs_iget(struct super_block *sb,
 	if (!inode || !(inode->i_state & I_NEW))
 		return inode;
 
-	error = orangefs_inode_getattr(inode, 1, 1, STATX_ALL);
+	error = orangefs_inode_getattr(inode, 1, 1, STATX_BASIC_STATS);
 	if (error) {
 		iget_failed(inode);
 		return ERR_PTR(error);
@@ -453,7 +454,7 @@ struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir,
 	orangefs_set_inode(inode, ref);
 	inode->i_ino = hash;	/* needed for stat etc */
 
-	error = orangefs_inode_getattr(inode, 1, 1, STATX_ALL);
+	error = orangefs_inode_getattr(inode, 1, 1, STATX_BASIC_STATS);
 	if (error)
 		goto out_iput;
 
-- 
2.14.3