From 2f2591a34db6c9361faa316c91a6e320cb4e6aee Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Tue, 18 Dec 2012 06:35:10 -0500 Subject: [PATCH] cifs: don't compare uniqueids in cifs_prime_dcache unless server inode numbers are in use MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Oliver reported that commit cd60042c caused his cifs mounts to continually thrash through new inodes on readdir. His servers are not sending inode numbers (or he's not using them), and the new test in that function doesn't account for that sort of setup correctly. If we're not using server inode numbers, then assume that the inode attached to the dentry hasn't changed. Go ahead and update the attributes in place, but keep the same inode number. Cc: # v3.5+ Reported-and-Tested-by: Oliver Mössinger Signed-off-by: Jeff Layton Signed-off-by: Steve French --- fs/cifs/readdir.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c index 6002fdc920a..cdd6ff48246 100644 --- a/fs/cifs/readdir.c +++ b/fs/cifs/readdir.c @@ -78,6 +78,7 @@ cifs_prime_dcache(struct dentry *parent, struct qstr *name, struct dentry *dentry, *alias; struct inode *inode; struct super_block *sb = parent->d_inode->i_sb; + struct cifs_sb_info *cifs_sb = CIFS_SB(sb); cFYI(1, "%s: for %s", __func__, name->name); @@ -91,10 +92,20 @@ cifs_prime_dcache(struct dentry *parent, struct qstr *name, int err; inode = dentry->d_inode; - /* update inode in place if i_ino didn't change */ - if (inode && CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) { - cifs_fattr_to_inode(inode, fattr); - goto out; + if (inode) { + /* + * If we're generating inode numbers, then we don't + * want to clobber the existing one with the one that + * the readdir code created. + */ + if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) + fattr->cf_uniqueid = CIFS_I(inode)->uniqueid; + + /* update inode in place if i_ino didn't change */ + if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) { + cifs_fattr_to_inode(inode, fattr); + goto out; + } } err = d_invalidate(dentry); dput(dentry);