Somebody noticed an "ls -l" over nfs failing on entries with inode
numbers greater than 2^32 on a 32-bit NFS server. The cause is some
code that tries to compare i_ino to the full 64-bit inode number.
I think the following will fix it, but I'm curious: why is i_ino
"unsigned long", anyway? Is there something know that depends on that,
or is it just that the sheer number of users makes it too scary to
change?
--b.
commit 0cc784eb430285535ae7a79dd5133ab66e9ce839
Author: J. Bruce Fields <bfields@xxxxxxxxxx>
Date: Tue Sep 10 11:41:12 2013 -0400
exportfs: fix 32-bit nfsd handling of 64-bit inode numbers
Symptoms were spurious -ENOENTs on stat of an NFS filesystem from a
32-bit NFS server exporting a very large XFS filesystem, when the
server's cache is cold (so the inodes in question are not in cache).
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 293bc2e..6a79bb8 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -215,7 +215,7 @@ struct getdents_callback {
struct dir_context ctx;
char *name; /* name that was found. It already points to a
buffer NAME_MAX+1 is size */
- unsigned long ino; /* the inum we are looking for */
+ u64 ino; /* the inum we are looking for */
int found; /* inode matched? */
int sequence; /* sequence counter */
};
@@ -255,10 +255,10 @@ static int get_name(const struct path *path, char *name, struct dentry *child)
struct inode *dir = path->dentry->d_inode;
int error;
struct file *file;
+ struct kstat stat;
struct getdents_callback buffer = {
.ctx.actor = filldir_one,
.name = name,
- .ino = child->d_inode->i_ino
};
error = -ENOTDIR;
@@ -268,6 +268,16 @@ static int get_name(const struct path *path, char *name, struct dentry *child)
if (!dir->i_fop)
goto out;
/*
+ * inode->i_ino is unsigned long, kstat->ino is u64, so the
+ * former would be insufficient on 32-bit hosts when the
+ * filesystem supports 64-bit inode numbers. So we need to
+ * actually call ->getattr, not just read i_ino:
+ */
+ error = vfs_getattr(path, &stat);
+ if (error)
+ return error;
+ buffer.ino = stat.ino;
+ /*
* Open the directory ...
*/
file = dentry_open(path, O_RDONLY, cred);
--
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