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authorJeff Layton <jlayton@redhat.com>2012-12-18 06:35:10 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-01-11 09:19:06 -0800
commit1dcfb28724803c27657b335dbb8f4494067d10e5 (patch)
tree0b6a43c326317ae0a1b1a3988b3f138048f5072c
parent862dc356d36fd84c5673af61364447bd38b453c6 (diff)
cifs: don't compare uniqueids in cifs_prime_dcache unless server inode numbers are in use
commit 2f2591a34db6c9361faa316c91a6e320cb4e6aee upstream. 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. Reported-and-Tested-by: Oliver Mössinger <Oliver.Moessinger@ichaus.de> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/cifs/readdir.c19
1 files changed, 15 insertions, 4 deletions
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index b940896efbf6..dd538b4c81aa 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);