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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).

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reported-by: Trevor Cordes <trevor@tecnopolis.ca>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
J. Bruce Fields 2013-09-10 11:41:12 -04:00 committed by Al Viro
parent b7a6ec52dd
commit 950ee9566a
1 changed files with 16 additions and 2 deletions
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18
fs/exportfs/expfs.c
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@ -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 +255,14 @@ 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 path child_path = {
.mnt = path->mnt,
.dentry = child,
};
struct getdents_callback buffer = {
.ctx.actor = filldir_one,
.name = name,
.ino = child->d_inode->i_ino
};
error = -ENOTDIR;
@ -267,6 +271,16 @@ static int get_name(const struct path *path, char *name, struct dentry *child)
error = -EINVAL;
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_nosec(&child_path, &stat);
if (error)
return error;
buffer.ino = stat.ino;
/*
* Open the directory ...
*/